* [RFC PATCHv2 1/7] HSI: Introducing HSI framework
2010-05-07 15:18 [RFC PATCHv2 0/7] HSI framework and drivers Carlos Chinea
@ 2010-05-07 15:18 ` Carlos Chinea
2010-05-07 15:26 ` Randy Dunlap
2010-05-14 14:22 ` Sebastien Jan
2010-05-07 15:18 ` [RFC PATCHv2 2/7] OMAP SSI: Introducing OMAP SSI driver Carlos Chinea
` (5 subsequent siblings)
6 siblings, 2 replies; 17+ messages in thread
From: Carlos Chinea @ 2010-05-07 15:18 UTC (permalink / raw)
To: linux-kernel; +Cc: linux-omap
Adds HSI framework in to the linux kernel.
High Speed Synchronous Serial Interface (HSI) is a
serial interface mainly used for connecting application
engines (APE) with cellular modem engines (CMT) in cellular
handsets.
HSI provides multiplexing for up to 16 logical channels,
low-latency and full duplex communication.
Signed-off-by: Carlos Chinea <carlos.chinea@nokia.com>
---
drivers/Kconfig | 2 +
drivers/Makefile | 1 +
drivers/hsi/Kconfig | 13 ++
drivers/hsi/Makefile | 4 +
drivers/hsi/hsi.c | 489 +++++++++++++++++++++++++++++++++++++++++++++++
include/linux/hsi/hsi.h | 369 +++++++++++++++++++++++++++++++++++
6 files changed, 878 insertions(+), 0 deletions(-)
create mode 100644 drivers/hsi/Kconfig
create mode 100644 drivers/hsi/Makefile
create mode 100644 drivers/hsi/hsi.c
create mode 100644 include/linux/hsi/hsi.h
diff --git a/drivers/Kconfig b/drivers/Kconfig
index a2b902f..4fe39f9 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -50,6 +50,8 @@ source "drivers/i2c/Kconfig"
source "drivers/spi/Kconfig"
+source "drivers/hsi/Kconfig"
+
source "drivers/pps/Kconfig"
source "drivers/gpio/Kconfig"
diff --git a/drivers/Makefile b/drivers/Makefile
index 2c4f277..24ca5bd 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -45,6 +45,7 @@ obj-$(CONFIG_SCSI) += scsi/
obj-$(CONFIG_ATA) += ata/
obj-$(CONFIG_MTD) += mtd/
obj-$(CONFIG_SPI) += spi/
+obj-$(CONFIG_HSI) += hsi/
obj-y += net/
obj-$(CONFIG_ATM) += atm/
obj-$(CONFIG_FUSION) += message/
diff --git a/drivers/hsi/Kconfig b/drivers/hsi/Kconfig
new file mode 100644
index 0000000..5af62ce
--- /dev/null
+++ b/drivers/hsi/Kconfig
@@ -0,0 +1,13 @@
+#
+# HSI driver configuration
+#
+menuconfig HSI
+ bool "HSI support"
+ ---help---
+ The "High speed synchronous Serial Interface" is
+ synchronous serial interface used mainly to connect
+ application engines and cellular modems.
+
+if HSI
+
+endif # HSI
diff --git a/drivers/hsi/Makefile b/drivers/hsi/Makefile
new file mode 100644
index 0000000..b42b6cf
--- /dev/null
+++ b/drivers/hsi/Makefile
@@ -0,0 +1,4 @@
+#
+# Makefile for HSI
+#
+obj-$(CONFIG_HSI) += hsi.o
diff --git a/drivers/hsi/hsi.c b/drivers/hsi/hsi.c
new file mode 100644
index 0000000..0e29f2c
--- /dev/null
+++ b/drivers/hsi/hsi.c
@@ -0,0 +1,489 @@
+/*
+ * hsi.c
+ *
+ * HSI core.
+ *
+ * Copyright (C) 2010 Nokia Corporation. All rights reserved.
+ *
+ * Contact: Carlos Chinea <carlos.chinea@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+#include <linux/hsi/hsi.h>
+#include <linux/rwsem.h>
+#include <linux/list.h>
+#include <linux/kobject.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+
+struct hsi_cl_info {
+ struct list_head list;
+ struct hsi_board_info info;
+};
+
+static LIST_HEAD(hsi_board_list);
+
+static struct device_type hsi_ctrl = {
+ .name = "hsi_controller",
+};
+
+static struct device_type hsi_cl = {
+ .name = "hsi_client",
+};
+
+static struct device_type hsi_port = {
+ .name = "hsi_port",
+};
+
+static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
+ char *buf)
+{
+ return sprintf(buf, "hsi:%s\n", dev_name(dev));
+}
+
+static struct device_attribute hsi_bus_dev_attrs[] = {
+ __ATTR_RO(modalias),
+ __ATTR_NULL,
+};
+
+static int hsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+ add_uevent_var(env, "MODALIAS=hsi:%s", dev_name(dev));
+
+ return 0;
+}
+
+static int hsi_bus_match(struct device *dev, struct device_driver *driver)
+{
+ return strcmp(dev_name(dev), driver->name) == 0;
+}
+
+static struct bus_type hsi_bus_type = {
+ .name = "hsi",
+ .dev_attrs = hsi_bus_dev_attrs,
+ .match = hsi_bus_match,
+ .uevent = hsi_bus_uevent,
+};
+
+static void hsi_client_release(struct device *dev)
+{
+ kfree(to_hsi_client(dev));
+}
+
+static void hsi_new_client(struct hsi_port *port, struct hsi_board_info *info)
+{
+ struct hsi_client *cl;
+
+ cl = kzalloc(sizeof(*cl), GFP_KERNEL);
+ if (!cl)
+ return;
+ cl->device.type = &hsi_cl;
+ cl->tx_cfg = info->tx_cfg;
+ cl->rx_cfg = info->rx_cfg;
+ cl->device.bus = &hsi_bus_type;
+ cl->device.parent = &port->device;
+ cl->device.release = hsi_client_release;
+ dev_set_name(&cl->device, info->name);
+ cl->device.platform_data = info->platform_data;
+ if (info->archdata)
+ cl->device.archdata = *info->archdata;
+ if (device_register(&cl->device) < 0) {
+ pr_err("hsi: failed to register client: %s\n", info->name);
+ kfree(cl);
+ }
+}
+
+/**
+ * hsi_register_board_info - Register HSI clients information
+ * @info: Array of HSI clients on the board
+ * @len: Length of the array
+ *
+ * HSI clients are statically declared and registered on board files.
+ *
+ * HSI clients will be automatically registered to the HSI bus once the
+ * controller and the port where the clients wishes to attach are registered
+ * to it.
+ *
+ * Return -errno on failure, 0 on success.
+ */
+int __init hsi_register_board_info(struct hsi_board_info const *info,
+ unsigned int len)
+{
+ struct hsi_cl_info *cl_info;
+
+ cl_info = kzalloc(sizeof(*cl_info) * len, GFP_KERNEL);
+ if (!cl_info)
+ return -ENOMEM;
+
+ for (; len; len--, info++, cl_info++) {
+ cl_info->info = *info;
+ list_add_tail(&cl_info->list, &hsi_board_list);
+ }
+
+ return 0;
+}
+
+static void hsi_scan_board_info(struct hsi_controller *hsi)
+{
+ struct hsi_cl_info *cl_info;
+ struct hsi_port *p;
+
+ list_for_each_entry(cl_info, &hsi_board_list, list)
+ if (cl_info->info.hsi_id == hsi->id) {
+ p = hsi_find_port_num(hsi, cl_info->info.port);
+ if (!p)
+ continue;
+ hsi_new_client(p, &cl_info->info);
+ }
+}
+
+static int hsi_remove_client(struct device *dev, void *data)
+{
+ device_unregister(dev);
+
+ return 0;
+}
+
+static int hsi_remove_port(struct device *dev, void *data)
+{
+ device_for_each_child(dev, NULL, hsi_remove_client);
+ device_unregister(dev);
+
+ return 0;
+}
+
+static void hsi_controller_release(struct device *dev)
+{
+}
+
+static void hsi_port_release(struct device *dev)
+{
+}
+
+/**
+ * hsi_unregister_controller - Unregister an HSI controller
+ * @hsi: The HSI controller to register
+ */
+void hsi_unregister_controller(struct hsi_controller *hsi)
+{
+ device_for_each_child(&hsi->device, NULL, hsi_remove_port);
+ device_unregister(&hsi->device);
+}
+EXPORT_SYMBOL_GPL(hsi_unregister_controller);
+
+/**
+ * hsi_register_controller - Register an HSI controller and its ports
+ * @hsi: The HSI controller to register
+ *
+ * Returns -errno on failure, 0 on success.
+ */
+int hsi_register_controller(struct hsi_controller *hsi)
+{
+ unsigned int i;
+ int err;
+
+ hsi->device.type = &hsi_ctrl;
+ hsi->device.bus = &hsi_bus_type;
+ hsi->device.release = hsi_controller_release;
+ err = device_register(&hsi->device);
+ if (err < 0)
+ return err;
+ for (i = 0; i < hsi->num_ports; i++) {
+ hsi->port[i].device.parent = &hsi->device;
+ hsi->port[i].device.bus = &hsi_bus_type;
+ hsi->port[i].device.release = hsi_port_release;
+ hsi->port[i].device.type = &hsi_port;
+ err = device_register(&hsi->port[i].device);
+ if (err < 0)
+ goto out;
+ }
+ /* Populate HSI bus with HSI clients */
+ hsi_scan_board_info(hsi);
+
+ return 0;
+out:
+ hsi_unregister_controller(hsi);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(hsi_register_controller);
+
+/**
+ * hsi_register_client_driver - Register an HSI client to the HSI bus
+ * @drv: HSI client driver to register
+ *
+ * Returns -errno on failure, 0 on success.
+ */
+int hsi_register_client_driver(struct hsi_client_driver *drv)
+{
+ drv->driver.bus = &hsi_bus_type;
+
+ return driver_register(&drv->driver);
+}
+EXPORT_SYMBOL_GPL(hsi_register_client_driver);
+
+static inline int hsi_dummy_msg(struct hsi_msg *msg)
+{
+ return 0;
+}
+
+static inline int hsi_dummy_cl(struct hsi_client *cl)
+{
+ return 0;
+}
+
+/**
+ * hsi_alloc_controller - Allocate an HSI controller and its ports
+ * @n_ports: Number of ports on the HSI controller
+ * @flags: Kernel allocation flags
+ *
+ * Return NULL on failure or a pointer to an hsi_controller on success.
+ */
+struct hsi_controller *hsi_alloc_controller(unsigned int n_ports, gfp_t flags)
+{
+ struct hsi_controller *hsi;
+ struct hsi_port *port;
+ unsigned int i;
+
+ if (!n_ports)
+ return NULL;
+
+ port = kzalloc(sizeof(*port)*n_ports, flags);
+ if (!port)
+ return NULL;
+ hsi = kzalloc(sizeof(*hsi), flags);
+ if (!hsi)
+ goto out;
+ for (i = 0; i < n_ports; i++) {
+ dev_set_name(&port[i].device, "port%d", i);
+ port[i].num = i;
+ port[i].async = hsi_dummy_msg;
+ port[i].setup = hsi_dummy_cl;
+ port[i].flush = hsi_dummy_cl;
+ port[i].start_tx = hsi_dummy_cl;
+ port[i].stop_tx = hsi_dummy_cl;
+ port[i].release = hsi_dummy_cl;
+ mutex_init(&port[i].lock);
+ }
+ hsi->num_ports = n_ports;
+ hsi->port = port;
+
+ return hsi;
+out:
+ kfree(port);
+
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(hsi_alloc_controller);
+
+/**
+ * hsi_free_controller - Free an HSI controller
+ * @hsi: Pointer to HSI controller
+ */
+void hsi_free_controller(struct hsi_controller *hsi)
+{
+ if (!hsi)
+ return;
+
+ kfree(hsi->port);
+ kfree(hsi);
+}
+EXPORT_SYMBOL_GPL(hsi_free_controller);
+
+/**
+ * hsi_free_msg - Free an HSI message
+ * @msg: Pointer to the HSI message
+ *
+ * Client is responsible to free the buffers pointed by the scatterlists.
+ */
+void hsi_free_msg(struct hsi_msg *msg)
+{
+ if (!msg)
+ return;
+ sg_free_table(&msg->sgt);
+ kfree(msg);
+}
+EXPORT_SYMBOL_GPL(hsi_free_msg);
+
+/**
+ * hsi_alloc_msg - Allocate an HSI message
+ * @nents: Number of memory entries
+ * @flags: Kernel allocation flags
+ *
+ * nents can be 0. This mainly makes sense for read transfer.
+ * In that case, HSI drivers will call the complete callback when
+ * there is data to be read without consuming it.
+ *
+ * Return NULL on failure or a pointer to an hsi_msg on success.
+ */
+struct hsi_msg *hsi_alloc_msg(unsigned int nents, gfp_t flags)
+{
+ struct hsi_msg *msg;
+ int err;
+
+ msg = kzalloc(sizeof(*msg), flags);
+ if (!msg)
+ return NULL;
+
+ if (!nents)
+ return msg;
+
+ err = sg_alloc_table(&msg->sgt, nents, flags);
+ if (unlikely(err)) {
+ kfree(msg);
+ msg = NULL;
+ }
+
+ return msg;
+}
+EXPORT_SYMBOL_GPL(hsi_alloc_msg);
+
+/**
+ * hsi_async - Submit an HSI transfer to the controller
+ * @cl: HSI client sending the transfer
+ * @msg: The HSI transfer passed to controller
+ *
+ * The HSI message must have the channel, ttype, complete and destructor
+ * fields set beforehand. If nents > 0 then the client has to initialize
+ * also the scatterlists to point to the buffers to write to or read from.
+ *
+ * HSI controllers relay on pre-allocated buffers from their clients and they
+ * do not allocate buffers on their own.
+ *
+ * Once the HSI message transfer finishes, the HSI controller calls the
+ * complete callback with the status and actual_len fields of the HSI message
+ * updated. The complete callback can be called before returning from
+ * hsi_async.
+ *
+ * Returns -errno on failure or 0 on success
+ */
+int hsi_async(struct hsi_client *cl, struct hsi_msg *msg)
+{
+ struct hsi_port *port = hsi_get_port(cl);
+
+ if (!hsi_port_claimed(cl))
+ return -EACCES;
+
+ WARN_ON_ONCE(!msg->destructor || !msg->complete);
+ msg->cl = cl;
+
+ return port->async(msg);
+}
+EXPORT_SYMBOL_GPL(hsi_async);
+
+/**
+ * hsi_claim_port - Claim the HSI client's port
+ * @cl: HSI client that wants to claim its port
+ * @share: Flag to indicate if the client wants to share the port or not.
+ *
+ * Returns -errno on failure, 0 on success.
+ */
+int hsi_claim_port(struct hsi_client *cl, unsigned int share)
+{
+ struct hsi_port *port = hsi_get_port(cl);
+ int err = 0;
+
+ mutex_lock(&port->lock);
+ if ((port->claimed) && (!port->shared || !share)) {
+ err = -EBUSY;
+ goto out;
+ }
+ port->claimed++;
+ port->shared = !!share;
+ cl->pclaimed = 1;
+out:
+ mutex_unlock(&port->lock);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(hsi_claim_port);
+
+/**
+ * hsi_release_port - Release the HSI client's port
+ * @cl: HSI client which previously claimed its port
+ */
+void hsi_release_port(struct hsi_client *cl)
+{
+ struct hsi_port *port = hsi_get_port(cl);
+
+ /* Allow HW driver to do some cleanup */
+ port->release(cl);
+ mutex_lock(&port->lock);
+ if (cl->pclaimed)
+ port->claimed--;
+ BUG_ON(port->claimed < 0);
+ cl->pclaimed = 0;
+ if (!port->claimed)
+ port->shared = 0;
+ mutex_unlock(&port->lock);
+}
+EXPORT_SYMBOL_GPL(hsi_release_port);
+
+static int hsi_start_rx(struct device *dev, void *data)
+{
+ struct hsi_client *cl = to_hsi_client(dev);
+
+ if (cl->hsi_start_rx)
+ (*cl->hsi_start_rx)(cl);
+
+ return 0;
+}
+
+static int hsi_stop_rx(struct device *dev, void *data)
+{
+ struct hsi_client *cl = to_hsi_client(dev);
+
+ if (cl->hsi_stop_rx)
+ (*cl->hsi_stop_rx)(cl);
+
+ return 0;
+}
+
+/**
+ * hsi_event -Notifies clients about port events
+ * @port: Port where the event occurred
+ * @event: The event type
+ *
+ * Clients should not be concerned about wake line behavior. However, due
+ * to a race condition in HSI HW protocol, clients need to be notified
+ * about wake line changes, so they can implement a workaround for it.
+ *
+ * Events:
+ * HSI_EVENT_START_RX - Incoming wake line high
+ * HSI_EVENT_STOP_RX - Incoming wake line down
+ */
+void hsi_event(struct hsi_port *port, unsigned int event)
+{
+ int (*fn)(struct device *dev, void *data);
+
+ switch (event) {
+ case HSI_EVENT_START_RX:
+ fn = hsi_start_rx;
+ break;
+ case HSI_EVENT_STOP_RX:
+ fn = hsi_stop_rx;
+ break;
+ default:
+ return;
+ }
+ device_for_each_child(&port->device, NULL, fn);
+}
+EXPORT_SYMBOL_GPL(hsi_event);
+
+static int __init hsi_init(void)
+{
+ return bus_register(&hsi_bus_type);
+}
+postcore_initcall(hsi_init);
diff --git a/include/linux/hsi/hsi.h b/include/linux/hsi/hsi.h
new file mode 100644
index 0000000..8f39c74
--- /dev/null
+++ b/include/linux/hsi/hsi.h
@@ -0,0 +1,369 @@
+/*
+ * hsi.h
+ *
+ * HSI core header file.
+ *
+ * Copyright (C) 2010 Nokia Corporation. All rights reserved.
+ *
+ * Contact: Carlos Chinea <carlos.chinea@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#ifndef __LINUX_HSI_H__
+#define __LINUX_HSI_H__
+
+#include <linux/device.h>
+#include <linux/mutex.h>
+#include <linux/scatterlist.h>
+
+/* HSI message ttype */
+#define HSI_MSG_READ 0
+#define HSI_MSG_WRITE 1
+
+/* HSI configuration values */
+#define HSI_MODE_STREAM 1
+#define HSI_MODE_FRAME 2
+#define HSI_FLOW_SYNC 0 /* Synchronized flow */
+#define HSI_FLOW_PIPE 1 /* Pipelined flow */
+#define HSI_ARB_RR 0 /* Round-robin arbitration */
+#define HSI_ARB_PRIO 1 /* Channel priority arbitration */
+
+#define HSI_MAX_CHANNELS 16
+
+/* HSI message status codes */
+enum {
+ HSI_STATUS_COMPLETED, /* Message transfer is completed */
+ HSI_STATUS_PENDING, /* Message pending to be read/write (POLL) */
+ HSI_STATUS_PROCEDING, /* Message transfer is ongoing */
+ HSI_STATUS_QUEUED, /* Message waiting to be served */
+ HSI_STATUS_ERROR, /* Error when message transfer was ongoing */
+};
+
+/* HSI port event codes */
+enum {
+ HSI_EVENT_START_RX,
+ HSI_EVENT_STOP_RX,
+};
+
+/**
+ * struct hsi_config - Configuration for RX/TX HSI modules
+ * @mode: Bit transmission mode (STREAM or FRAME)
+ * @flow: Flow type (SYNCHRONIZED or PIPELINE)
+ * @channels: Number of channels to use [1..16]
+ * @speed: Max bit transmission speed (Kbit/s)
+ * @arb_mode: Arbitration mode for TX frame (Round robin, priority)
+ */
+struct hsi_config {
+ unsigned int mode;
+ unsigned int flow;
+ unsigned int channels;
+ unsigned int speed;
+ unsigned int arb_mode; /* TX only */
+};
+
+/**
+ * struct hsi_board_info - HSI client board info
+ * @name: Name for the HSI device
+ * @hsi_id: HSI controller id where the client sits
+ * @port: Port number in the controller where the client sits
+ * @tx_cfg: HSI TX configuration
+ * @rx_cfg: HSI RX configuration
+ * @platform_data: Platform related data
+ * @archdata: Architecture-dependent device data
+ */
+struct hsi_board_info {
+ const char *name;
+ int hsi_id;
+ unsigned int port;
+ struct hsi_config tx_cfg;
+ struct hsi_config rx_cfg;
+ void *platform_data;
+ struct dev_archdata *archdata;
+};
+
+#ifdef CONFIG_HSI
+extern int hsi_register_board_info(struct hsi_board_info const *info,
+ unsigned int len);
+#else
+static inline int hsi_register_board_info(struct hsi_board_info const *info,
+ unsigned int len)
+{
+ return 0;
+}
+#endif
+
+/**
+ * struct hsi_client - HSI client attached to an HSI port
+ * @device: Driver model representation of the device
+ * @tx_cfg: HSI TX configuration
+ * @rx_cfg: HSI RX configuration
+ * @hsi_start_rx: Called after incoming wake line goes high
+ * @hsi_stop_rx: Called after incoming wake line goes low
+ */
+struct hsi_client {
+ struct device device;
+ struct hsi_config tx_cfg;
+ struct hsi_config rx_cfg;
+ void (*hsi_start_rx)(struct hsi_client *cl);
+ void (*hsi_stop_rx)(struct hsi_client *cl);
+ /* private: */
+ unsigned int pclaimed:1;
+};
+
+#define to_hsi_client(dev) container_of(dev, struct hsi_client, device)
+
+static inline void hsi_client_set_drvdata(struct hsi_client *cl, void *data)
+{
+ dev_set_drvdata(&cl->device, data);
+}
+
+static inline void *hsi_client_drvdata(struct hsi_client *cl)
+{
+ return dev_get_drvdata(&cl->device);
+}
+
+/**
+ * struct hsi_client_driver - Driver associated to an HSI client
+ * @driver: Driver model representation of the driver
+ */
+struct hsi_client_driver {
+ struct device_driver driver;
+};
+
+#define to_hsi_client_driver(drv) container_of(drv, struct hsi_client_driver,\
+ driver)
+
+int hsi_register_client_driver(struct hsi_client_driver *drv);
+
+static inline void hsi_unregister_client_driver(struct hsi_client_driver *drv)
+{
+ driver_unregister(&drv->driver);
+}
+
+/**
+ * struct hsi_msg - HSI message descriptor
+ * @link: Free to use by the current descriptor owner
+ * @cl: HSI device client that issues the transfer
+ * @sgt: Head of the scatterlist array
+ * @context: Client context data associated to the transfer
+ * @complete: Transfer completion callback
+ * @destructor: Destructor to free resources when flushing
+ * @status: Status of the transfer when completed
+ * @actual_len: Actual length of data transfered on completion
+ * @channel: Channel were to TX/RX the message
+ * @ttype: Transfer type (TX if set, RX otherwise)
+ * @break_frame: if true HSI will send/receive a break frame (FRAME MODE)
+ */
+struct hsi_msg {
+ struct list_head link;
+ struct hsi_client *cl;
+ struct sg_table sgt;
+ void *context;
+
+ void (*complete)(struct hsi_msg *msg);
+ void (*destructor)(struct hsi_msg *msg);
+
+ int status;
+ unsigned int actual_len;
+ unsigned int channel;
+ unsigned int ttype:1;
+ unsigned int break_frame:1;
+};
+
+struct hsi_msg *hsi_alloc_msg(unsigned int n_frag, gfp_t flags);
+void hsi_free_msg(struct hsi_msg *msg);
+
+/**
+ * struct hsi_port - HSI port device
+ * @device: Driver model representation of the device
+ * @tx_cfg: Current TX path configuration
+ * @rx_cfg: Current RX path configuration
+ * @num: Port number
+ * @shared: Set when port can be shared by different clients
+ * @claimed: Reference count of clients which claimed the port
+ * @lock: Serialize port claim
+ * @async: Asynchronous transfer callback
+ * @setup: Callback to set the HSI client configuration
+ * @flush: Callback to clean the HW state and destroy all pending transfers
+ * @start_tx: Callback to inform that a client wants to TX data
+ * @stop_tx: Callback to inform that a client no longer wishes to TX data
+ * @release: Callback to inform that a client no longer uses the port
+ */
+struct hsi_port {
+ struct device device;
+ struct hsi_config tx_cfg;
+ struct hsi_config rx_cfg;
+ unsigned int num;
+ unsigned int shared:1;
+ int claimed;
+ struct mutex lock;
+ int (*async)(struct hsi_msg *msg);
+ int (*setup)(struct hsi_client *cl);
+ int (*flush)(struct hsi_client *cl);
+ int (*start_tx)(struct hsi_client *cl);
+ int (*stop_tx)(struct hsi_client *cl);
+ int (*release)(struct hsi_client *cl);
+};
+
+#define to_hsi_port(dev) container_of(dev, struct hsi_port, device)
+#define hsi_get_port(cl) to_hsi_port((cl)->device.parent)
+
+void hsi_event(struct hsi_port *port, unsigned int event);
+int hsi_claim_port(struct hsi_client *cl, unsigned int share);
+void hsi_release_port(struct hsi_client *cl);
+
+static inline int hsi_port_claimed(struct hsi_client *cl)
+{
+ return cl->pclaimed;
+}
+
+static inline void hsi_port_set_drvdata(struct hsi_port *port, void *data)
+{
+ dev_set_drvdata(&port->device, data);
+}
+
+static inline void *hsi_port_drvdata(struct hsi_port *port)
+{
+ return dev_get_drvdata(&port->device);
+}
+
+/**
+ * struct hsi_controller - HSI controller device
+ * @device: Driver model representation of the device
+ * @id: HSI controller ID
+ * @num_ports: Number of ports in the HSI controller
+ * @port: Array of HSI ports
+ */
+struct hsi_controller {
+ struct device device;
+ int id;
+ unsigned int num_ports;
+ struct hsi_port *port;
+};
+
+#define to_hsi_controller(dev) container_of(dev, struct hsi_controller, device)
+
+struct hsi_controller *hsi_alloc_controller(unsigned int n_ports, gfp_t flags);
+void hsi_free_controller(struct hsi_controller *hsi);
+int hsi_register_controller(struct hsi_controller *hsi);
+void hsi_unregister_controller(struct hsi_controller *hsi);
+
+static inline void hsi_controller_set_drvdata(struct hsi_controller *hsi,
+ void *data)
+{
+ dev_set_drvdata(&hsi->device, data);
+}
+
+static inline void *hsi_controller_drvdata(struct hsi_controller *hsi)
+{
+ return dev_get_drvdata(&hsi->device);
+}
+
+static inline struct hsi_port *hsi_find_port_num(struct hsi_controller *hsi,
+ unsigned int num)
+{
+ return (num < hsi->num_ports) ? &hsi->port[num] : NULL;
+}
+
+/*
+ * API for HSI clients
+ */
+int hsi_async(struct hsi_client *cl, struct hsi_msg *msg);
+
+/**
+ * hsi_setup - Configure the client's port
+ * @cl: Pointer to the HSI client
+ *
+ * When sharing ports, clients should either relay on a single
+ * client setup or have the same setup for all of them.
+ *
+ * Return -errno on failure, 0 on success
+ */
+static inline int hsi_setup(struct hsi_client *cl)
+{
+ if (!hsi_port_claimed(cl))
+ return -EACCES;
+ return hsi_get_port(cl)->setup(cl);
+}
+
+/**
+ * hsi_flush - Flush all pending transactions on the client's port
+ * @cl: Pointer to the HSI client
+ *
+ * This function will destroy all pending hsi_msg in the port and reset
+ * the HW port so it is ready to receive and transmit from a clean state.
+ *
+ * Return -errno on failure, 0 on success
+ */
+static inline int hsi_flush(struct hsi_client *cl)
+{
+ if (!hsi_port_claimed(cl))
+ return -EACCES;
+ return hsi_get_port(cl)->flush(cl);
+}
+
+/**
+ * hsi_async_read - Submit a read transfer
+ * @cl: Pointer to the HSI client
+ * @msg: HSI message descriptor of the transfer
+ *
+ * Return -errno on failure, 0 on success
+ */
+static inline int hsi_async_read(struct hsi_client *cl, struct hsi_msg *msg)
+{
+ msg->ttype = HSI_MSG_READ;
+ return hsi_async(cl, msg);
+}
+
+/**
+ * hsi_async_write - Submit a write transfer
+ * @cl: Pointer to the HSI client
+ * @msg: HSI message descriptor of the transfer
+ *
+ * Return -errno on failure, 0 on success
+ */
+static inline int hsi_async_write(struct hsi_client *cl, struct hsi_msg *msg)
+{
+ msg->ttype = HSI_MSG_WRITE;
+ return hsi_async(cl, msg);
+}
+
+/**
+ * hsi_start_tx - Signal the port that the client wants to start a TX
+ * @cl: Pointer to the HSI client
+ *
+ * Return -errno on failure, 0 on success
+ */
+static inline int hsi_start_tx(struct hsi_client *cl)
+{
+ if (!hsi_port_claimed(cl))
+ return -EACCES;
+ return hsi_get_port(cl)->start_tx(cl);
+}
+
+/**
+ * hsi_stop_tx - Signal the port that the client no longer wants to transmit
+ * @cl: Pointer to the HSI client
+ *
+ * Return -errno on failure, 0 on success
+ */
+static inline int hsi_stop_tx(struct hsi_client *cl)
+{
+ if (!hsi_port_claimed(cl))
+ return -EACCES;
+ return hsi_get_port(cl)->stop_tx(cl);
+}
+#endif /* __LINUX_HSI_H__ */
--
1.5.6.5
^ permalink raw reply related [flat|nested] 17+ messages in thread* [RFC PATCHv2 2/7] OMAP SSI: Introducing OMAP SSI driver
2010-05-07 15:18 [RFC PATCHv2 0/7] HSI framework and drivers Carlos Chinea
2010-05-07 15:18 ` [RFC PATCHv2 1/7] HSI: Introducing HSI framework Carlos Chinea
@ 2010-05-07 15:18 ` Carlos Chinea
2010-05-14 14:41 ` Sebastien Jan
2010-05-07 15:18 ` [RFC PATCHv2 3/7] OMAP SSI: Add OMAP SSI to the kernel configuration Carlos Chinea
` (4 subsequent siblings)
6 siblings, 1 reply; 17+ messages in thread
From: Carlos Chinea @ 2010-05-07 15:18 UTC (permalink / raw)
To: linux-kernel; +Cc: linux-omap
Introduces the OMAP SSI driver in the kernel.
The Synchronous Serial Interface (SSI) is a legacy version
of HSI. As in the case of HSI, it is mainly used to connect
Application engines (APE) with cellular modem engines (CMT)
in cellular handsets.
It provides a multichannel, full-duplex, multi-core communication
with no reference clock. The OMAP SSI block is capable of reaching
speeds of 110 Mbit/s.
Signed-off-by: Carlos Chinea <carlos.chinea@nokia.com>
---
arch/arm/mach-omap2/ssi.c | 139 +++
arch/arm/plat-omap/include/plat/ssi.h | 196 ++++
drivers/hsi/controllers/omap_ssi.c | 1694 +++++++++++++++++++++++++++++++++
3 files changed, 2029 insertions(+), 0 deletions(-)
create mode 100644 arch/arm/mach-omap2/ssi.c
create mode 100644 arch/arm/plat-omap/include/plat/ssi.h
create mode 100644 drivers/hsi/controllers/omap_ssi.c
diff --git a/arch/arm/mach-omap2/ssi.c b/arch/arm/mach-omap2/ssi.c
new file mode 100644
index 0000000..b46aea8
--- /dev/null
+++ b/arch/arm/mach-omap2/ssi.c
@@ -0,0 +1,139 @@
+/*
+ * linux/arch/arm/mach-omap2/ssi.c
+ *
+ * Copyright (C) 2010 Nokia Corporation. All rights reserved.
+ *
+ * Contact: Carlos Chinea <carlos.chinea@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/platform_device.h>
+#include <plat/omap-pm.h>
+#include <plat/ssi.h>
+
+static struct omap_ssi_platform_data ssi_pdata = {
+ .num_ports = SSI_NUM_PORTS,
+ .get_dev_context_loss_count = omap_pm_get_dev_context_loss_count,
+};
+
+static struct resource ssi_resources[] = {
+ /* SSI controller */
+ [0] = {
+ .start = 0x48058000,
+ .end = 0x48058fff,
+ .name = "omap_ssi_sys",
+ .flags = IORESOURCE_MEM,
+ },
+ /* GDD */
+ [1] = {
+ .start = 0x48059000,
+ .end = 0x48059fff,
+ .name = "omap_ssi_gdd",
+ .flags = IORESOURCE_MEM,
+ },
+ [2] = {
+ .start = 71,
+ .end = 71,
+ .name = "ssi_gdd",
+ .flags = IORESOURCE_IRQ,
+ },
+ /* SSI port 1 */
+ [3] = {
+ .start = 0x4805a000,
+ .end = 0x4805a7ff,
+ .name = "omap_ssi_sst1",
+ .flags = IORESOURCE_MEM,
+ },
+ [4] = {
+ .start = 0x4805a800,
+ .end = 0x4805afff,
+ .name = "omap_ssi_ssr1",
+ .flags = IORESOURCE_MEM,
+ },
+ [5] = {
+ .start = 67,
+ .end = 67,
+ .name = "ssi_p1_mpu_irq0",
+ .flags = IORESOURCE_IRQ,
+ },
+ [6] = {
+ .start = 69,
+ .end = 69,
+ .name = "ssi_p1_mpu_irq1",
+ .flags = IORESOURCE_IRQ,
+ },
+ [7] = {
+ .start = 0,
+ .end = 0,
+ .name = "ssi_p1_cawake",
+ .flags = IORESOURCE_IRQ | IORESOURCE_UNSET,
+ },
+};
+
+static void ssi_pdev_release(struct device *dev)
+{
+}
+
+static struct platform_device ssi_pdev = {
+ .name = "omap_ssi",
+ .id = 0,
+ .num_resources = ARRAY_SIZE(ssi_resources),
+ .resource = ssi_resources,
+ .dev = {
+ .release = ssi_pdev_release,
+ .platform_data = &ssi_pdata,
+ },
+};
+
+int __init omap_ssi_config(struct omap_ssi_board_config *ssi_config)
+{
+ unsigned int port, offset, cawake_gpio;
+ int err;
+
+ ssi_pdata.num_ports = ssi_config->num_ports;
+ for (port = 0, offset = 7; port < ssi_config->num_ports;
+ port++, offset += 5) {
+ cawake_gpio = ssi_config->cawake_gpio[port];
+ if (!cawake_gpio)
+ continue; /* Nothing to do */
+ err = gpio_request(cawake_gpio, "cawake");
+ if (err < 0)
+ goto rback;
+ gpio_direction_input(cawake_gpio);
+ ssi_resources[offset].start = gpio_to_irq(cawake_gpio);
+ ssi_resources[offset].flags &= ~IORESOURCE_UNSET;
+ ssi_resources[offset].flags |= IORESOURCE_IRQ_HIGHEDGE |
+ IORESOURCE_IRQ_LOWEDGE;
+ }
+
+ return 0;
+rback:
+ dev_err(&ssi_pdev.dev, "Request cawake (gpio%d) failed\n", cawake_gpio);
+ while (port > 0)
+ gpio_free(ssi_config->cawake_gpio[--port]);
+
+ return err;
+}
+
+static int __init ssi_init(void)
+{
+ return platform_device_register(&ssi_pdev);
+}
+subsys_initcall(ssi_init);
diff --git a/arch/arm/plat-omap/include/plat/ssi.h b/arch/arm/plat-omap/include/plat/ssi.h
new file mode 100644
index 0000000..b077605
--- /dev/null
+++ b/arch/arm/plat-omap/include/plat/ssi.h
@@ -0,0 +1,196 @@
+/*
+ * plat/ssi.h
+ *
+ * Hardware definitions for SSI.
+ *
+ * Copyright (C) 2010 Nokia Corporation. All rights reserved.
+ *
+ * Contact: Carlos Chinea <carlos.chinea@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#ifndef __OMAP_SSI_REGS_H__
+#define __OMAP_SSI_REGS_H__
+
+#define SSI_NUM_PORTS 1
+/*
+ * SSI SYS registers
+ */
+#define SSI_REVISION_REG 0
+# define SSI_REV_MAJOR 0xf0
+# define SSI_REV_MINOR 0xf
+#define SSI_SYSCONFIG_REG 0x10
+# define SSI_AUTOIDLE (1 << 0)
+# define SSI_SOFTRESET (1 << 1)
+# define SSI_SIDLEMODE_FORCE 0
+# define SSI_SIDLEMODE_NO (1 << 3)
+# define SSI_SIDLEMODE_SMART (1 << 4)
+# define SSI_SIDLEMODE_MASK 0x18
+# define SSI_MIDLEMODE_FORCE 0
+# define SSI_MIDLEMODE_NO (1 << 12)
+# define SSI_MIDLEMODE_SMART (1 << 13)
+# define SSI_MIDLEMODE_MASK 0x3000
+#define SSI_SYSSTATUS_REG 0x14
+# define SSI_RESETDONE 1
+#define SSI_MPU_STATUS_REG(port, irq) (0x808 + ((port) * 0x10) + ((irq) * 2))
+#define SSI_MPU_ENABLE_REG(port, irq) (0x80c + ((port) * 0x10) + ((irq) * 8))
+# define SSI_DATAACCEPT(channel) (1 << (channel))
+# define SSI_DATAAVAILABLE(channel) (1 << ((channel) + 8))
+# define SSI_DATAOVERRUN(channel) (1 << ((channel) + 16))
+# define SSI_ERROROCCURED (1 << 24)
+# define SSI_BREAKDETECTED (1 << 25)
+#define SSI_GDD_MPU_IRQ_STATUS_REG 0x0800
+#define SSI_GDD_MPU_IRQ_ENABLE_REG 0x0804
+# define SSI_GDD_LCH(channel) (1 << (channel))
+#define SSI_WAKE_REG(port) (0xc00 + ((port) * 0x10))
+#define SSI_CLEAR_WAKE_REG(port) (0xc04 + ((port) * 0x10))
+#define SSI_SET_WAKE_REG(port) (0xc08 + ((port) * 0x10))
+# define SSI_WAKE(channel) (1 << (channel))
+# define SSI_WAKE_MASK 0xff
+
+/*
+ * SSI SST registers
+ */
+#define SSI_SST_ID_REG 0
+#define SSI_SST_MODE_REG 4
+# define SSI_MODE_VAL_MASK 3
+# define SSI_MODE_SLEEP 0
+# define SSI_MODE_STREAM 1
+# define SSI_MODE_FRAME 2
+# define SSI_MODE_MULTIPOINTS 3
+#define SSI_SST_FRAMESIZE_REG 8
+# define SSI_FRAMESIZE_DEFAULT 31
+#define SSI_SST_TXSTATE_REG 0xc
+# define SSI_TXSTATE_IDLE 0
+#define SSI_SST_BUFSTATE_REG 0x10
+# define SSI_FULL(channel) (1 << (channel))
+#define SSI_SST_DIVISOR_REG 0x18
+# define SSI_MAX_DIVISOR 127
+#define SSI_SST_BREAK_REG 0x20
+#define SSI_SST_CHANNELS_REG 0x24
+# define SSI_CHANNELS_DEFAULT 4
+#define SSI_SST_ARBMODE_REG 0x28
+# define SSI_ARBMODE_ROUNDROBIN 0
+# define SSI_ARBMODE_PRIORITY 1
+#define SSI_SST_BUFFER_CH_REG(channel) (0x80 + ((channel) * 4))
+#define SSI_SST_SWAPBUF_CH_REG(channel) (0xc0 + ((channel) * 4))
+
+/*
+ * SSI SSR registers
+ */
+#define SSI_SSR_ID_REG 0
+#define SSI_SSR_MODE_REG 4
+#define SSI_SSR_FRAMESIZE_REG 8
+#define SSI_SSR_RXSTATE_REG 0xc
+#define SSI_SSR_BUFSTATE_REG 0x10
+# define SSI_NOTEMPTY(channel) (1 << (channel))
+#define SSI_SSR_BREAK_REG 0x1c
+#define SSI_SSR_ERROR_REG 0x20
+#define SSI_SSR_ERRORACK_REG 0x24
+#define SSI_SSR_OVERRUN_REG 0x2c
+#define SSI_SSR_OVERRUNACK_REG 0x30
+#define SSI_SSR_TIMEOUT_REG 0x34
+# define SSI_TIMEOUT_DEFAULT 0
+#define SSI_SSR_CHANNELS_REG 0x28
+#define SSI_SSR_BUFFER_CH_REG(channel) (0x80 + ((channel) * 4))
+#define SSI_SSR_SWAPBUF_CH_REG(channel) (0xc0 + ((channel) * 4))
+
+/*
+ * SSI GDD registers
+ */
+#define SSI_GDD_HW_ID_REG 0
+#define SSI_GDD_PPORT_ID_REG 0x10
+#define SSI_GDD_MPORT_ID_REG 0x14
+#define SSI_GDD_PPORT_SR_REG 0x20
+#define SSI_GDD_MPORT_SR_REG 0x24
+# define SSI_ACTIVE_LCH_NUM_MASK 0xff
+#define SSI_GDD_TEST_REG 0x40
+# define SSI_TEST 1
+#define SSI_GDD_GCR_REG 0x100
+# define SSI_CLK_AUTOGATING_ON (1 << 3)
+# define SSI_FREE (1 << 2)
+# define SSI_SWITCH_OFF (1 << 0)
+#define SSI_GDD_GRST_REG 0x200
+# define SSI_SWRESET 1
+#define SSI_GDD_CSDP_REG(channel) (0x800 + ((channel) * 0x40))
+# define SSI_DST_BURST_EN_MASK 0xc000
+# define SSI_DST_SINGLE_ACCESS0 0
+# define SSI_DST_SINGLE_ACCESS (1 << 14)
+# define SSI_DST_BURST_4x32_BIT (2 << 14)
+# define SSI_DST_BURST_8x32_BIT (3 << 14)
+# define SSI_DST_MASK 0x1e00
+# define SSI_DST_MEMORY_PORT (8 << 9)
+# define SSI_DST_PERIPHERAL_PORT (9 << 9)
+# define SSI_SRC_BURST_EN_MASK 0x180
+# define SSI_SRC_SINGLE_ACCESS0 0
+# define SSI_SRC_SINGLE_ACCESS (1 << 7)
+# define SSI_SRC_BURST_4x32_BIT (2 << 7)
+# define SSI_SRC_BURST_8x32_BIT (3 << 7)
+# define SSI_SRC_MASK 0x3c
+# define SSI_SRC_MEMORY_PORT (8 << 2)
+# define SSI_SRC_PERIPHERAL_PORT (9 << 2)
+# define SSI_DATA_TYPE_MASK 3
+# define SSI_DATA_TYPE_S32 2
+#define SSI_GDD_CCR_REG(channel) (0x802 + ((channel) * 0x40))
+# define SSI_DST_AMODE_MASK (3 << 14)
+# define SSI_DST_AMODE_CONST 0
+# define SSI_DST_AMODE_POSTINC (1 << 12)
+# define SSI_SRC_AMODE_MASK (3 << 12)
+# define SSI_SRC_AMODE_CONST 0
+# define SSI_SRC_AMODE_POSTINC (1 << 12)
+# define SSI_CCR_ENABLE (1 << 7)
+# define SSI_CCR_SYNC_MASK 0x1f
+#define SSI_GDD_CICR_REG(channel) (0x804 + ((channel) * 0x40))
+# define SSI_BLOCK_IE (1 << 5)
+# define SSI_HALF_IE (1 << 2)
+# define SSI_TOUT_IE (1 << 0)
+#define SSI_GDD_CSR_REG(channel) (0x806 + ((channel) * 0x40))
+# define SSI_CSR_SYNC (1 << 6)
+# define SSI_CSR_BLOCK (1 << 5)
+# define SSI_CSR_HALF (1 << 2)
+# define SSI_CSR_TOUR (1 << 0)
+#define SSI_GDD_CSSA_REG(channel) (0x808 + ((channel) * 0x40))
+#define SSI_GDD_CDSA_REG(channel) (0x80c + ((channel) * 0x40))
+#define SSI_GDD_CEN_REG(channel) (0x810 + ((channel) * 0x40))
+#define SSI_GDD_CSAC_REG(channel) (0x818 + ((channel) * 0x40))
+#define SSI_GDD_CDAC_REG(channel) (0x81a + ((channel) * 0x40))
+#define SSI_GDD_CLNK_CTRL_REG(channel) (0x828 + ((channel) * 0x40))
+# define SSI_ENABLE_LNK (1 << 15)
+# define SSI_STOP_LNK (1 << 14)
+# define SSI_NEXT_CH_ID_MASK 0xf
+
+/**
+ * struct omap_ssi_platform_data - OMAP SSI platform data
+ * @num_ports: Number of ports on the controller
+ * @ctxt_loss_count: Pointer to omap_pm_get_dev_context_loss_count
+ */
+struct omap_ssi_platform_data {
+ unsigned int num_ports;
+ int (*get_dev_context_loss_count)(struct device *dev);
+};
+
+/**
+ * struct omap_ssi_config - SSI board configuration
+ * @num_ports: Number of ports in use
+ * @cawake_line: Array of cawake gpio lines
+ */
+struct omap_ssi_board_config {
+ unsigned int num_ports;
+ int cawake_gpio[SSI_NUM_PORTS];
+};
+
+extern int omap_ssi_config(struct omap_ssi_board_config *ssi_config);
+#endif /* __OMAP_SSI_REGS_H__ */
diff --git a/drivers/hsi/controllers/omap_ssi.c b/drivers/hsi/controllers/omap_ssi.c
new file mode 100644
index 0000000..01f5cbe
--- /dev/null
+++ b/drivers/hsi/controllers/omap_ssi.c
@@ -0,0 +1,1694 @@
+/*
+ * omap_ssi.c
+ *
+ * Implements the OMAP SSI driver.
+ *
+ * Copyright (C) 2010 Nokia Corporation. All rights reserved.
+ *
+ * Contact: Carlos Chinea <carlos.chinea@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+#include <linux/err.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/delay.h>
+#include <linux/seq_file.h>
+#include <linux/scatterlist.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/hsi/hsi.h>
+#include <linux/debugfs.h>
+#include <plat/omap-pm.h>
+#include <plat/clock.h>
+#include <plat/ssi.h>
+
+#define SSI_MAX_CHANNELS 8
+#define SSI_MAX_GDD_LCH 8
+#define SSI_BYTES_TO_FRAMES(x) ((((x) - 1) >> 2) + 1)
+
+/**
+ * struct gdd_trn - GDD transaction data
+ * @msg: Pointer to the HSI message being served
+ * @sg: Pointer to the current sg entry being served
+ */
+struct gdd_trn {
+ struct hsi_msg *msg;
+ struct scatterlist *sg;
+};
+
+/**
+ * struct omap_ssi_controller - OMAP SSI controller data
+ * @dev: device associated to the controller (HSI controller)
+ * @sys: SSI I/O base address
+ * @gdd: GDD I/O base address
+ * @ick: SSI interconnect clock
+ * @fck: SSI functional clock
+ * @ck_refcount: References count for clocks
+ * @gdd_irq: IRQ line for GDD
+ * @gdd_tasklet: bottom half for DMA transfers
+ * @gdd_trn: Array of GDD transaction data for ongoing GDD transfers
+ * @lock: lock to serialize access to GDD
+ * @ck_lock: lock to serialize access to the clocks
+ * @rate_change: flag to know if we are in the middle of a DVFS transition
+ * @loss_count: To follow if we need to restore context or not
+ * @sysconfig: SSI controller saved context
+ * @gdd_gcr: SSI GDD saved context
+ * @get_loss: Pointer to omap_pm_get_dev_context_loss_count, if any
+ * @dir: Debugfs SSI root directory
+ */
+struct omap_ssi_controller {
+ struct device *dev;
+ unsigned long sys;
+ unsigned long gdd;
+ struct clk *ick;
+ struct clk *fck;
+ int ck_refcount;
+ unsigned int gdd_irq;
+ struct tasklet_struct gdd_tasklet;
+ struct gdd_trn gdd_trn[SSI_MAX_GDD_LCH];
+ spinlock_t lock;
+ spinlock_t ck_lock;
+ u32 fck_rate;
+ unsigned int rate_change:1;
+ int loss_count;
+ /* OMAP SSI Controller context */
+ u32 sysconfig;
+ u32 gdd_gcr;
+ int (*get_loss)(struct device *dev);
+#ifdef CONFIG_DEBUG_FS
+ struct dentry *dir;
+#endif
+};
+
+/**
+ * struct omap_ssm_ctx - OMAP synchronous serial module (TX/RX) context
+ * @mode: Bit transmission mode
+ * @channels: Number of channels
+ * @framesize: Frame size in bits
+ * @timeout: RX frame timeout
+ * @divisot: TX divider
+ * @arb_mode: Arbitration mode for TX frame (Round robin, priority)
+ */
+struct omap_ssm_ctx {
+ u32 mode;
+ u32 channels;
+ u32 frame_size;
+ union {
+ u32 timeout; /* Rx Only */
+ struct {
+ u32 arb_mode;
+ u32 divisor;
+ }; /* Tx only */
+ };
+};
+
+/**
+ * struct omap_ssi_port - OMAP SSI port data
+ * @dev: device associated to the port (HSI port)
+ * @sst_dma: SSI transmitter physical base address
+ * @ssr_dma: SSI receiver physical base address
+ * @sst_base: SSI transmitter base address
+ * @ssr_base: SSI receiver base address
+ * @lock: Spin lock to serialize access to the SSI port
+ * @channels: Current number of channels configured (1,2,4 or 8)
+ * @txqueue: TX message queues
+ * @rxqueue: RX message queues
+ * @brkqueue: Queue of incoming HWBREAK requests (FRAME mode)
+ * @irq: IRQ number
+ * @wake_irq: IRQ number for incoming wake line (-1 if none)
+ * @pio_tasklet: Bottom half for PIO transfers and events
+ * @wake_tasklet: Bottom half for incoming wake events
+ * @wkin_cken: Keep track of clock references due to the incoming wake line
+ * @wake_refcount: Reference count for output wake line
+ * @sys_mpu_enable: Context for the interrupt enable register for irq 0
+ * @sst: Context for the synchronous serial transmitter
+ * @ssr: Context for the synchronous serial receiver
+ */
+struct omap_ssi_port {
+ struct device *dev;
+ dma_addr_t sst_dma;
+ dma_addr_t ssr_dma;
+ unsigned long sst_base;
+ unsigned long ssr_base;
+ spinlock_t wk_lock;
+ spinlock_t lock;
+ unsigned int channels;
+ struct list_head txqueue[SSI_MAX_CHANNELS];
+ struct list_head rxqueue[SSI_MAX_CHANNELS];
+ struct list_head brkqueue;
+ unsigned int irq;
+ int wake_irq;
+ struct tasklet_struct pio_tasklet;
+ struct tasklet_struct wake_tasklet;
+ unsigned int wkin_cken:1; /* Workaround */
+ int wk_refcount;
+ /* OMAP SSI port context */
+ u32 sys_mpu_enable; /* We use only one irq */
+ struct omap_ssm_ctx sst;
+ struct omap_ssm_ctx ssr;
+};
+
+static inline unsigned int ssi_wakein(struct hsi_port *port)
+{
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+
+ return gpio_get_value(irq_to_gpio(omap_port->wake_irq));
+}
+
+static int ssi_set_port_mode(struct device *dev, void *data)
+{
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(to_hsi_port(dev));
+ u32 *mode = data;
+
+ __raw_writel(*mode, omap_port->sst_base + SSI_SST_MODE_REG);
+ __raw_writel(*mode, omap_port->ssr_base + SSI_SSR_MODE_REG);
+
+ return 0;
+}
+
+static inline void ssi_set_mode(struct hsi_controller *ssi, u32 mode)
+{
+ device_for_each_child(&ssi->device, &mode, ssi_set_port_mode);
+}
+
+static int ssi_restore_port_mode(struct device *dev, void *data)
+{
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(to_hsi_port(dev));
+
+ __raw_writel(omap_port->sst.mode,
+ omap_port->sst_base + SSI_SST_MODE_REG);
+ __raw_writel(omap_port->ssr.mode,
+ omap_port->ssr_base + SSI_SSR_MODE_REG);
+
+ return 0;
+}
+
+static int ssi_restore_port_ctx(struct device *dev, void *data)
+{
+ struct hsi_port *port = to_hsi_port(dev);
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct hsi_controller *ssi = to_hsi_controller(dev->parent);
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ unsigned long base = omap_port->sst_base;
+
+ __raw_writel(omap_port->sys_mpu_enable,
+ omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+ /* SST context */
+ __raw_writel(omap_port->sst.frame_size, base + SSI_SST_FRAMESIZE_REG);
+ __raw_writel(omap_port->sst.divisor, base + SSI_SST_DIVISOR_REG);
+ __raw_writel(omap_port->sst.channels, base + SSI_SST_CHANNELS_REG);
+ __raw_writel(omap_port->sst.arb_mode, base + SSI_SST_ARBMODE_REG);
+ /* SSR context */
+ base = omap_port->ssr_base;
+ __raw_writel(omap_port->ssr.frame_size, base + SSI_SSR_FRAMESIZE_REG);
+ __raw_writel(omap_port->ssr.channels, base + SSI_SSR_CHANNELS_REG);
+ __raw_writel(omap_port->ssr.timeout, base + SSI_SSR_TIMEOUT_REG);
+
+ return 0;
+}
+
+static int ssi_save_port_ctx(struct device *dev, void *data)
+{
+ struct hsi_port *port = to_hsi_port(dev);
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct hsi_controller *ssi = to_hsi_controller(dev->parent);
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+
+ omap_port->sys_mpu_enable = __raw_readl(omap_ssi->sys +
+ SSI_MPU_ENABLE_REG(port->num, 0));
+
+ return 0;
+}
+
+static int ssi_clk_enable(struct hsi_controller *ssi)
+{
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ int err = 0;
+
+ spin_lock_bh(&omap_ssi->ck_lock);
+ if (omap_ssi->ck_refcount++)
+ goto out;
+
+ err = clk_enable(omap_ssi->fck);
+ if (unlikely(err < 0))
+ goto out;
+ err = clk_enable(omap_ssi->ick);
+ if (unlikely(err < 0)) {
+ clk_disable(omap_ssi->fck);
+ goto out;
+ }
+ if ((omap_ssi->get_loss) && (omap_ssi->loss_count ==
+ (*omap_ssi->get_loss)(ssi->device.parent)))
+ goto mode; /* We always need to restore the mode */
+
+ __raw_writel(omap_ssi->sysconfig, omap_ssi->sys + SSI_SYSCONFIG_REG);
+ __raw_writel(omap_ssi->gdd_gcr, omap_ssi->gdd + SSI_GDD_GCR_REG);
+
+ device_for_each_child(&ssi->device, NULL, ssi_restore_port_ctx);
+mode:
+ if (!omap_ssi->rate_change)
+ device_for_each_child(&ssi->device, NULL,
+ ssi_restore_port_mode);
+out:
+ spin_unlock_bh(&omap_ssi->ck_lock);
+
+ return err;
+}
+
+static void ssi_clk_disable(struct hsi_controller *ssi)
+{
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+
+ spin_lock_bh(&omap_ssi->ck_lock);
+ WARN_ON(omap_ssi->ck_refcount <= 0);
+ if (--omap_ssi->ck_refcount)
+ goto out;
+
+ if (!omap_ssi->rate_change)
+ ssi_set_mode(ssi, SSI_MODE_SLEEP);
+
+ if (omap_ssi->get_loss)
+ omap_ssi->loss_count =
+ (*omap_ssi->get_loss)(ssi->device.parent);
+
+ device_for_each_child(&ssi->device, NULL, ssi_save_port_ctx);
+ clk_disable(omap_ssi->ick);
+ clk_disable(omap_ssi->fck);
+
+out:
+ spin_unlock_bh(&omap_ssi->ck_lock);
+}
+
+#ifdef CONFIG_DEBUG_FS
+static int ssi_debug_show(struct seq_file *m, void *p)
+{
+ struct hsi_controller *ssi = m->private;
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ unsigned long sys = omap_ssi->sys;
+
+ ssi_clk_enable(ssi);
+ seq_printf(m, "REVISION\t: 0x%08x\n",
+ __raw_readl(sys + SSI_REVISION_REG));
+ seq_printf(m, "SYSCONFIG\t: 0x%08x\n",
+ __raw_readl(sys + SSI_SYSCONFIG_REG));
+ seq_printf(m, "SYSSTATUS\t: 0x%08x\n",
+ __raw_readl(sys + SSI_SYSSTATUS_REG));
+ ssi_clk_disable(ssi);
+
+ return 0;
+}
+
+static int ssi_debug_port_show(struct seq_file *m, void *p)
+{
+ struct hsi_port *port = m->private;
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ unsigned long base = omap_ssi->sys;
+ unsigned int ch;
+
+ ssi_clk_enable(ssi);
+ if (omap_port->wake_irq > 0)
+ seq_printf(m, "CAWAKE\t\t: %d\n", ssi_wakein(port));
+ seq_printf(m, "WAKE\t\t: 0x%08x\n",
+ __raw_readl(base + SSI_WAKE_REG(port->num)));
+ seq_printf(m, "MPU_ENABLE_IRQ%d\t: 0x%08x\n", 0,
+ __raw_readl(base + SSI_MPU_ENABLE_REG(port->num, 0)));
+ seq_printf(m, "MPU_STATUS_IRQ%d\t: 0x%08x\n", 0,
+ __raw_readl(base + SSI_MPU_STATUS_REG(port->num, 0)));
+ /* SST */
+ base = omap_port->sst_base;
+ seq_printf(m, "\nSST\n===\n");
+ seq_printf(m, "MODE\t\t: 0x%08x\n",
+ __raw_readl(base + SSI_SST_MODE_REG));
+ seq_printf(m, "FRAMESIZE\t: 0x%08x\n",
+ __raw_readl(base + SSI_SST_FRAMESIZE_REG));
+ seq_printf(m, "DIVISOR\t\t: 0x%08x\n",
+ __raw_readl(base + SSI_SST_DIVISOR_REG));
+ seq_printf(m, "CHANNELS\t: 0x%08x\n",
+ __raw_readl(base + SSI_SST_CHANNELS_REG));
+ seq_printf(m, "ARBMODE\t\t: 0x%08x\n",
+ __raw_readl(base + SSI_SST_ARBMODE_REG));
+ seq_printf(m, "TXSTATE\t\t: 0x%08x\n",
+ __raw_readl(base + SSI_SST_TXSTATE_REG));
+ seq_printf(m, "BUFSTATE\t: 0x%08x\n",
+ __raw_readl(base + SSI_SST_BUFSTATE_REG));
+ seq_printf(m, "BREAK\t\t: 0x%08x\n",
+ __raw_readl(base + SSI_SST_BREAK_REG));
+ for (ch = 0; ch < omap_port->channels; ch++) {
+ seq_printf(m, "BUFFER_CH%d\t: 0x%08x\n", ch,
+ __raw_readl(base + SSI_SST_BUFFER_CH_REG(ch)));
+ }
+ /* SSR */
+ base = omap_port->ssr_base;
+ seq_printf(m, "\nSSR\n===\n");
+ seq_printf(m, "MODE\t\t: 0x%08x\n",
+ __raw_readl(base + SSI_SSR_MODE_REG));
+ seq_printf(m, "FRAMESIZE\t: 0x%08x\n",
+ __raw_readl(base + SSI_SSR_FRAMESIZE_REG));
+ seq_printf(m, "CHANNELS\t: 0x%08x\n",
+ __raw_readl(base + SSI_SSR_CHANNELS_REG));
+ seq_printf(m, "TIMEOUT\t\t: 0x%08x\n",
+ __raw_readl(base + SSI_SSR_TIMEOUT_REG));
+ seq_printf(m, "RXSTATE\t\t: 0x%08x\n",
+ __raw_readl(base + SSI_SSR_RXSTATE_REG));
+ seq_printf(m, "BUFSTATE\t: 0x%08x\n",
+ __raw_readl(base + SSI_SSR_BUFSTATE_REG));
+ seq_printf(m, "BREAK\t\t: 0x%08x\n",
+ __raw_readl(base + SSI_SSR_BREAK_REG));
+ seq_printf(m, "ERROR\t\t: 0x%08x\n",
+ __raw_readl(base + SSI_SSR_ERROR_REG));
+ seq_printf(m, "ERRORACK\t: 0x%08x\n",
+ __raw_readl(base + SSI_SSR_ERRORACK_REG));
+ for (ch = 0; ch < omap_port->channels; ch++) {
+ seq_printf(m, "BUFFER_CH%d\t: 0x%08x\n", ch,
+ __raw_readl(base + SSI_SSR_BUFFER_CH_REG(ch)));
+ }
+ ssi_clk_disable(ssi);
+
+ return 0;
+}
+
+static int ssi_debug_gdd_show(struct seq_file *m, void *p)
+{
+ struct hsi_controller *ssi = m->private;
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ unsigned long gdd = omap_ssi->gdd;
+ int lch;
+
+ ssi_clk_enable(ssi);
+ seq_printf(m, "GDD_MPU_STATUS\t: 0x%08x\n",
+ __raw_readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_STATUS_REG));
+ seq_printf(m, "GDD_MPU_ENABLE\t: 0x%08x\n\n",
+ __raw_readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG));
+ seq_printf(m, "HW_ID\t\t: 0x%08x\n",
+ __raw_readl(gdd + SSI_GDD_HW_ID_REG));
+ seq_printf(m, "PPORT_ID\t: 0x%08x\n",
+ __raw_readl(gdd + SSI_GDD_PPORT_ID_REG));
+ seq_printf(m, "MPORT_ID\t: 0x%08x\n",
+ __raw_readl(gdd + SSI_GDD_MPORT_ID_REG));
+ seq_printf(m, "TEST\t\t: 0x%08x\n",
+ __raw_readl(gdd + SSI_GDD_TEST_REG));
+ seq_printf(m, "GCR\t\t: 0x%08x\n",
+ __raw_readl(gdd + SSI_GDD_GCR_REG));
+
+ for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) {
+ seq_printf(m, "\nGDD LCH %d\n=========\n", lch);
+ seq_printf(m, "CSDP\t\t: 0x%04x\n",
+ __raw_readw(gdd + SSI_GDD_CSDP_REG(lch)));
+ seq_printf(m, "CCR\t\t: 0x%04x\n",
+ __raw_readw(gdd + SSI_GDD_CCR_REG(lch)));
+ seq_printf(m, "CICR\t\t: 0x%04x\n",
+ __raw_readw(gdd + SSI_GDD_CICR_REG(lch)));
+ seq_printf(m, "CSR\t\t: 0x%04x\n",
+ __raw_readw(gdd + SSI_GDD_CSR_REG(lch)));
+ seq_printf(m, "CSSA\t\t: 0x%08x\n",
+ __raw_readl(gdd + SSI_GDD_CSSA_REG(lch)));
+ seq_printf(m, "CDSA\t\t: 0x%08x\n",
+ __raw_readl(gdd + SSI_GDD_CDSA_REG(lch)));
+ seq_printf(m, "CEN\t\t: 0x%04x\n",
+ __raw_readw(gdd + SSI_GDD_CEN_REG(lch)));
+ seq_printf(m, "CSAC\t\t: 0x%04x\n",
+ __raw_readw(gdd + SSI_GDD_CSAC_REG(lch)));
+ seq_printf(m, "CDAC\t\t: 0x%04x\n",
+ __raw_readw(gdd + SSI_GDD_CDAC_REG(lch)));
+ seq_printf(m, "CLNK_CTRL\t: 0x%04x\n",
+ __raw_readw(gdd + SSI_GDD_CLNK_CTRL_REG(lch)));
+ }
+ ssi_clk_disable(ssi);
+
+ return 0;
+}
+
+static int ssi_regs_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, ssi_debug_show, inode->i_private);
+}
+
+static int ssi_port_regs_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, ssi_debug_port_show, inode->i_private);
+}
+
+static int ssi_gdd_regs_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, ssi_debug_gdd_show, inode->i_private);
+}
+
+static const struct file_operations ssi_regs_fops = {
+ .open = ssi_regs_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static const struct file_operations ssi_port_regs_fops = {
+ .open = ssi_port_regs_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static const struct file_operations ssi_gdd_regs_fops = {
+ .open = ssi_gdd_regs_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int __init ssi_debug_add_port(struct device *dev, void *data)
+{
+ struct hsi_port *port = to_hsi_port(dev);
+ struct dentry *dir = data;
+
+ dir = debugfs_create_dir(dev_name(dev), dir);
+ if (IS_ERR(dir))
+ return PTR_ERR(dir);
+ debugfs_create_file("regs", S_IRUGO, dir, port, &ssi_port_regs_fops);
+
+ return 0;
+}
+
+static int __init ssi_debug_add_ctrl(struct hsi_controller *ssi)
+{
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ struct dentry *dir;
+ int err;
+
+ /* SSI controller */
+ omap_ssi->dir = debugfs_create_dir(dev_name(&ssi->device), NULL);
+ if (IS_ERR(omap_ssi->dir))
+ return PTR_ERR(omap_ssi->dir);
+
+ debugfs_create_file("regs", S_IRUGO, omap_ssi->dir, ssi,
+ &ssi_regs_fops);
+ /* SSI GDD (DMA) */
+ dir = debugfs_create_dir("gdd", omap_ssi->dir);
+ if (IS_ERR(dir))
+ goto rback;
+ debugfs_create_file("regs", S_IRUGO, dir, ssi, &ssi_gdd_regs_fops);
+ /* SSI ports */
+ err = device_for_each_child(&ssi->device, omap_ssi->dir,
+ ssi_debug_add_port);
+ if (err < 0)
+ goto rback;
+
+ return 0;
+rback:
+ debugfs_remove_recursive(omap_ssi->dir);
+
+ return PTR_ERR(dir);
+}
+
+static void ssi_debug_remove_ctrl(struct hsi_controller *ssi)
+{
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+
+ debugfs_remove_recursive(omap_ssi->dir);
+}
+#endif /* CONFIG_DEBUG_FS */
+
+static int ssi_claim_lch(struct hsi_msg *msg)
+{
+
+ struct hsi_port *port = hsi_get_port(msg->cl);
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ int lch;
+
+ for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++)
+ if (!omap_ssi->gdd_trn[lch].msg) {
+ omap_ssi->gdd_trn[lch].msg = msg;
+ omap_ssi->gdd_trn[lch].sg = msg->sgt.sgl;
+ return lch;
+ }
+
+ return -EBUSY;
+}
+
+static int ssi_start_pio(struct hsi_msg *msg)
+{
+ struct hsi_port *port = hsi_get_port(msg->cl);
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ u32 val;
+
+ ssi_clk_enable(ssi);
+ if (msg->ttype == HSI_MSG_WRITE) {
+ val = SSI_DATAACCEPT(msg->channel);
+ ssi_clk_enable(ssi); /* Hold clocks for pio writes */
+ } else {
+ val = SSI_DATAAVAILABLE(msg->channel) | SSI_ERROROCCURED;
+ }
+ dev_dbg(&port->device, "Single %s transfer\n",
+ msg->ttype ? "write" : "read");
+ val |= __raw_readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+ __raw_writel(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+ ssi_clk_disable(ssi);
+ msg->actual_len = 0;
+ msg->status = HSI_STATUS_PROCEDING;
+
+ return 0;
+}
+
+static int ssi_start_dma(struct hsi_msg *msg, int lch)
+{
+ struct hsi_port *port = hsi_get_port(msg->cl);
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ unsigned long gdd = omap_ssi->gdd;
+ int err;
+ u16 csdp;
+ u16 ccr;
+ u32 s_addr;
+ u32 d_addr;
+ u32 tmp;
+
+ if (msg->ttype == HSI_MSG_READ) {
+ err = dma_map_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents,
+ DMA_FROM_DEVICE);
+ if (err < 0) {
+ dev_dbg(&ssi->device, "DMA map SG failed !\n");
+ return err;
+ }
+ csdp = SSI_DST_BURST_4x32_BIT | SSI_DST_MEMORY_PORT |
+ SSI_SRC_SINGLE_ACCESS0 | SSI_SRC_PERIPHERAL_PORT |
+ SSI_DATA_TYPE_S32;
+ ccr = msg->channel + 0x10 + (port->num * 8); /* Sync */
+ ccr |= SSI_DST_AMODE_POSTINC | SSI_SRC_AMODE_CONST |
+ SSI_CCR_ENABLE;
+ s_addr = omap_port->ssr_dma +
+ SSI_SSR_BUFFER_CH_REG(msg->channel);
+ d_addr = sg_dma_address(msg->sgt.sgl);
+ } else {
+ err = dma_map_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents,
+ DMA_TO_DEVICE);
+ if (err < 0) {
+ dev_dbg(&ssi->device, "DMA map SG failed !\n");
+ return err;
+ }
+ csdp = SSI_SRC_BURST_4x32_BIT | SSI_SRC_MEMORY_PORT |
+ SSI_DST_SINGLE_ACCESS0 | SSI_DST_PERIPHERAL_PORT |
+ SSI_DATA_TYPE_S32;
+ ccr = (msg->channel + 1 + (port->num * 8)) & 0xf; /* Sync */
+ ccr |= SSI_SRC_AMODE_POSTINC | SSI_DST_AMODE_CONST |
+ SSI_CCR_ENABLE;
+ s_addr = sg_dma_address(msg->sgt.sgl);
+ d_addr = omap_port->sst_dma +
+ SSI_SST_BUFFER_CH_REG(msg->channel);
+ }
+ dev_dbg(&ssi->device, "lch %d cdsp %08x ccr %04x s_addr %08x"
+ " d_addr %08x\n", lch, csdp, ccr, s_addr, d_addr);
+ ssi_clk_enable(ssi); /* Hold clocks during the transfer */
+ __raw_writew(csdp, gdd + SSI_GDD_CSDP_REG(lch));
+ __raw_writew(SSI_BLOCK_IE | SSI_TOUT_IE, gdd + SSI_GDD_CICR_REG(lch));
+ __raw_writel(d_addr, gdd + SSI_GDD_CDSA_REG(lch));
+ __raw_writel(s_addr, gdd + SSI_GDD_CSSA_REG(lch));
+ __raw_writew(SSI_BYTES_TO_FRAMES(msg->sgt.sgl->length),
+ gdd + SSI_GDD_CEN_REG(lch));
+ tmp = __raw_readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
+ tmp |= SSI_GDD_LCH(lch);
+ __raw_writel(tmp, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
+ __raw_writew(ccr, gdd + SSI_GDD_CCR_REG(lch));
+ msg->status = HSI_STATUS_PROCEDING;
+
+ return 0;
+}
+
+static int ssi_start_transfer(struct list_head *queue)
+{
+ struct hsi_msg *msg;
+ int lch = -1;
+
+ if (list_empty(queue))
+ return 0;
+ msg = list_first_entry(queue, struct hsi_msg, link);
+ if (msg->status != HSI_STATUS_QUEUED)
+ return 0;
+ if ((msg->sgt.nents) && (msg->sgt.sgl->length > sizeof(u32)))
+ lch = ssi_claim_lch(msg);
+ if (lch >= 0)
+ return ssi_start_dma(msg, lch);
+ else
+ return ssi_start_pio(msg);
+}
+
+static void ssi_error(struct hsi_port *port)
+{
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ struct hsi_msg *msg;
+ unsigned int i;
+ u32 err;
+ u32 val;
+ u32 tmp;
+
+ /* ACK error */
+ err = __raw_readl(omap_port->ssr_base + SSI_SSR_ERROR_REG);
+ dev_err(&port->device, "SSI error: 0x%02x\n", err);
+ if (!err) {
+ dev_dbg(&port->device, "spurious SSI error ignored!\n");
+ return;
+ }
+ /* Cancel all GDD read transfers */
+ for (i = 0, val = 0; i < SSI_MAX_GDD_LCH; i++) {
+ msg = omap_ssi->gdd_trn[i].msg;
+ if ((msg) && (msg->ttype == HSI_MSG_READ)) {
+ __raw_writew(0, omap_ssi->gdd + SSI_GDD_CCR_REG(i));
+ val |= (1 << i);
+ omap_ssi->gdd_trn[i].msg = NULL;
+ }
+ }
+ tmp = __raw_readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
+ tmp &= ~val;
+ __raw_writel(tmp, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
+ /* Cancel all PIO read transfers */
+ tmp = __raw_readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+ tmp &= 0xfeff00ff; /* Disable error & all dataavailable interrupts */
+ __raw_writel(tmp, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+ /* Signal the error all current pending read requests */
+ for (i = 0; i < omap_port->channels; i++) {
+ if (list_empty(&omap_port->rxqueue[i]))
+ continue;
+ msg = list_first_entry(&omap_port->rxqueue[i], struct hsi_msg,
+ link);
+ list_del(&msg->link);
+ msg->status = HSI_STATUS_ERROR;
+ msg->complete(msg);
+ /* Now restart queued reads if any */
+ ssi_start_transfer(&omap_port->rxqueue[i]);
+ }
+ /* ACK error */
+ __raw_writel(err, omap_port->ssr_base + SSI_SSR_ERRORACK_REG);
+}
+
+static void ssi_break_complete(struct hsi_port *port)
+{
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ struct hsi_msg *msg;
+ struct hsi_msg *tmp;
+ u32 val;
+
+ dev_dbg(&port->device, "HWBREAK received\n");
+
+ spin_lock(&omap_port->lock);
+ val = __raw_readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+ val &= ~SSI_BREAKDETECTED;
+ __raw_writel(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+ __raw_writel(0, omap_port->ssr_base + SSI_SSR_BREAK_REG);
+ spin_unlock(&omap_port->lock);
+
+ list_for_each_entry_safe(msg, tmp, &omap_port->brkqueue, link) {
+ msg->status = HSI_STATUS_COMPLETED;
+ list_del(&msg->link);
+ msg->complete(msg);
+ }
+
+}
+
+static int ssi_async_break(struct hsi_msg *msg)
+{
+ struct hsi_port *port = hsi_get_port(msg->cl);
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ int err = 0;
+ u32 tmp;
+
+ ssi_clk_enable(ssi);
+ if (msg->ttype == HSI_MSG_WRITE) {
+ if (omap_port->sst.mode != SSI_MODE_FRAME) {
+ err = -EINVAL;
+ goto out;
+ }
+ __raw_writel(1, omap_port->sst_base + SSI_SST_BREAK_REG);
+ msg->status = HSI_STATUS_COMPLETED;
+ msg->complete(msg);
+ } else {
+ if (omap_port->ssr.mode != SSI_MODE_FRAME) {
+ err = -EINVAL;
+ goto out;
+ }
+ spin_lock_bh(&omap_port->lock);
+ tmp = __raw_readl(omap_ssi->sys +
+ SSI_MPU_ENABLE_REG(port->num, 0));
+ __raw_writel(tmp | SSI_BREAKDETECTED,
+ omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+ msg->status = HSI_STATUS_PROCEDING;
+ list_add_tail(&msg->link, &omap_port->brkqueue);
+ spin_unlock_bh(&omap_port->lock);
+ }
+out:
+ ssi_clk_disable(ssi);
+
+ return err;
+}
+
+static int ssi_async(struct hsi_msg *msg)
+{
+ struct hsi_port *port = hsi_get_port(msg->cl);
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct list_head *queue;
+ int err;
+
+ BUG_ON(!msg);
+
+ if (msg->sgt.nents > 1)
+ return -ENOSYS; /* TODO: Add sg support */
+
+ if (msg->break_frame)
+ return ssi_async_break(msg);
+
+ if (msg->ttype) {
+ BUG_ON(msg->channel >= omap_port->sst.channels);
+ queue = &omap_port->txqueue[msg->channel];
+ } else {
+ BUG_ON(msg->channel >= omap_port->ssr.channels);
+ queue = &omap_port->rxqueue[msg->channel];
+ }
+ msg->status = HSI_STATUS_QUEUED;
+ spin_lock_bh(&omap_port->lock);
+ list_add_tail(&msg->link, queue);
+ err = ssi_start_transfer(queue);
+ spin_unlock_bh(&omap_port->lock);
+
+ dev_dbg(&port->device, "msg status %d ttype %d ch %d\n",
+ msg->status, msg->ttype, msg->channel);
+
+ return err;
+}
+
+static void ssi_flush_queue(struct list_head *queue, struct hsi_client *cl)
+{
+ struct list_head *node, *tmp;
+ struct hsi_msg *msg;
+
+ list_for_each_safe(node, tmp, queue) {
+ msg = list_entry(node, struct hsi_msg, link);
+ if ((cl) && (cl != msg->cl))
+ continue;
+ list_del(node);
+ pr_debug("flush queue: ch %d, msg %p len %d type %d ctxt %p\n",
+ msg->channel, msg, msg->sgt.sgl->length,
+ msg->ttype, msg->context);
+ if (msg->destructor)
+ msg->destructor(msg);
+ else
+ hsi_free_msg(msg);
+ }
+}
+
+static u32 ssi_calculate_div(struct hsi_controller *ssi, u32 max_speed)
+{
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ u32 tx_fckrate = omap_ssi->fck_rate;
+
+ /* / 2 : SSI TX clock is always half of the SSI functional clock */
+ tx_fckrate >>= 1;
+ /* Round down when tx_fckrate % max_speed == 0 */
+ tx_fckrate--;
+ dev_dbg(&ssi->device, "TX divisor is %d for fck_rate %d speed %d\n",
+ tx_fckrate / max_speed, omap_ssi->fck_rate, max_speed);
+
+ return tx_fckrate / max_speed;
+}
+
+static int ssi_setup(struct hsi_client *cl)
+{
+ struct hsi_port *port = to_hsi_port(cl->device.parent);
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+ unsigned long sst = omap_port->sst_base;
+ unsigned long ssr = omap_port->ssr_base;
+ u32 div = 0;
+ int err = 0;
+
+ ssi_clk_enable(ssi);
+ spin_lock_bh(&omap_port->lock);
+
+ if (cl->tx_cfg.speed)
+ div = ssi_calculate_div(ssi, cl->tx_cfg.speed);
+
+ if (div > SSI_MAX_DIVISOR) {
+ dev_err(&cl->device, "Invalid TX speed %d Mb/s (div %d)\n",
+ cl->tx_cfg.speed, div);
+ err = -EINVAL;
+ goto out;
+ }
+ /* Set TX module to sleep to stop TX during cfg update */
+ __raw_writel(SSI_MODE_SLEEP, sst + SSI_SST_MODE_REG);
+ __raw_writel(31, sst + SSI_SST_FRAMESIZE_REG);
+ __raw_writel(div, sst + SSI_SST_DIVISOR_REG);
+ __raw_writel(cl->tx_cfg.channels, sst + SSI_SST_CHANNELS_REG);
+ __raw_writel(cl->tx_cfg.arb_mode, sst + SSI_SST_ARBMODE_REG);
+ __raw_writel(cl->tx_cfg.mode, sst + SSI_SST_MODE_REG);
+ /* Set RX module to sleep to stop RX during cfg update */
+ __raw_writel(SSI_MODE_SLEEP, ssr + SSI_SSR_MODE_REG);
+ __raw_writel(31, ssr + SSI_SSR_FRAMESIZE_REG);
+ __raw_writel(cl->rx_cfg.channels, ssr + SSI_SSR_CHANNELS_REG);
+ __raw_writel(0, ssr + SSI_SSR_TIMEOUT_REG);
+ /* Cleanup the break queue if we leave FRAME mode */
+ if ((omap_port->ssr.mode == SSI_MODE_FRAME) &&
+ (cl->rx_cfg.mode != SSI_MODE_FRAME))
+ ssi_flush_queue(&omap_port->brkqueue, cl);
+ __raw_writel(cl->rx_cfg.mode, ssr + SSI_SSR_MODE_REG);
+ omap_port->channels = max(cl->rx_cfg.channels, cl->tx_cfg.channels);
+ /* Shadow registering for OFF mode */
+ /* SST */
+ omap_port->sst.divisor = div;
+ omap_port->sst.frame_size = 31;
+ omap_port->sst.channels = cl->tx_cfg.channels;
+ omap_port->sst.arb_mode = cl->tx_cfg.arb_mode;
+ omap_port->sst.mode = cl->tx_cfg.mode;
+ /* SSR */
+ omap_port->ssr.frame_size = 31;
+ omap_port->ssr.timeout = 0;
+ omap_port->ssr.channels = cl->rx_cfg.channels;
+ omap_port->ssr.mode = cl->rx_cfg.mode;
+out:
+ spin_unlock_bh(&omap_port->lock);
+ ssi_clk_disable(ssi);
+
+ return err;
+}
+
+static void ssi_cleanup_queues(struct hsi_client *cl)
+{
+ struct hsi_port *port = hsi_get_port(cl);
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ struct hsi_msg *msg;
+ unsigned int i;
+ u32 rxbufstate = 0;
+ u32 txbufstate = 0;
+ u32 status = SSI_ERROROCCURED;
+ u32 tmp;
+
+ ssi_flush_queue(&omap_port->brkqueue, cl);
+ if (list_empty(&omap_port->brkqueue))
+ status |= SSI_BREAKDETECTED;
+
+ for (i = 0; i < omap_port->channels; i++) {
+ msg = list_first_entry(&omap_port->txqueue[i], struct hsi_msg,
+ link);
+ if ((msg) && (msg->cl == cl)) {
+ txbufstate |= (1 << i);
+ status |= SSI_DATAACCEPT(i);
+ /* Release the clocks writes, also GDD ones */
+ ssi_clk_disable(ssi);
+ }
+ ssi_flush_queue(&omap_port->txqueue[i], cl);
+ msg = list_first_entry(&omap_port->rxqueue[i], struct hsi_msg,
+ link);
+ if ((msg) && (msg->cl == cl)) {
+ rxbufstate |= (1 << i);
+ status |= SSI_DATAAVAILABLE(i);
+ }
+ ssi_flush_queue(&omap_port->rxqueue[i], cl);
+ /* Check if we keep the error detection interrupt armed */
+ if (!list_empty(&omap_port->rxqueue[i]))
+ status &= ~SSI_ERROROCCURED;
+ }
+ /* Cleanup write buffers */
+ tmp = __raw_readl(omap_port->sst_base + SSI_SST_BUFSTATE_REG);
+ tmp &= ~txbufstate;
+ __raw_writel(tmp, omap_port->sst_base + SSI_SST_BUFSTATE_REG);
+ /* Cleanup read buffers */
+ tmp = __raw_readl(omap_port->ssr_base + SSI_SSR_BUFSTATE_REG);
+ tmp &= ~rxbufstate;
+ __raw_writel(tmp, omap_port->ssr_base + SSI_SSR_BUFSTATE_REG);
+ /* Disarm and ack pending interrupts */
+ tmp = __raw_readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+ tmp &= ~status;
+ __raw_writel(tmp, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+ __raw_writel(status, omap_ssi->sys + SSI_MPU_STATUS_REG(port->num, 0));
+}
+
+static void ssi_cleanup_gdd(struct hsi_controller *ssi, struct hsi_client *cl)
+{
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ struct hsi_msg *msg;
+ unsigned int i;
+ u32 val = 0;
+ u32 tmp;
+
+ for (i = 0; i < SSI_MAX_GDD_LCH; i++) {
+ msg = omap_ssi->gdd_trn[i].msg;
+ if ((!msg) || (msg->cl != cl))
+ continue;
+ __raw_writew(0, omap_ssi->gdd + SSI_GDD_CCR_REG(i));
+ val |= (1 << i);
+ /*
+ * Clock references for write will be handled in
+ * ssi_cleanup_queues
+ */
+ if (msg->ttype == HSI_MSG_READ)
+ ssi_clk_disable(ssi);
+ omap_ssi->gdd_trn[i].msg = NULL;
+ }
+ tmp = __raw_readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
+ tmp &= ~val;
+ __raw_writel(tmp, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
+ __raw_writel(val, omap_ssi->sys + SSI_GDD_MPU_IRQ_STATUS_REG);
+}
+
+static int ssi_release(struct hsi_client *cl)
+{
+ struct hsi_port *port = hsi_get_port(cl);
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+
+ ssi_clk_enable(ssi);
+ spin_lock_bh(&omap_port->lock);
+ /* Stop all communications */
+ __raw_writel(SSI_MODE_SLEEP, omap_port->sst_base + SSI_SST_MODE_REG);
+ __raw_writel(SSI_MODE_SLEEP, omap_port->ssr_base + SSI_SSR_MODE_REG);
+ /* Stop all the pending DMA requests for that client */
+ ssi_cleanup_gdd(ssi, cl);
+ /* Now cleanup all the queues */
+ ssi_cleanup_queues(cl);
+ /* Restart communications */
+ ssi_restore_port_mode(&port->device, NULL);
+ spin_unlock_bh(&omap_port->lock);
+ ssi_clk_disable(ssi);
+
+ return 0;
+}
+
+static int ssi_flush(struct hsi_client *cl)
+{
+ struct hsi_port *port = hsi_get_port(cl);
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ struct hsi_msg *msg;
+ unsigned long sst = omap_port->sst_base;
+ unsigned long ssr = omap_port->ssr_base;
+ unsigned int i;
+ u32 err;
+
+ ssi_clk_enable(ssi);
+ spin_lock_bh(&omap_port->lock);
+ /* Stop all communications */
+ __raw_writel(SSI_MODE_SLEEP, sst + SSI_SST_MODE_REG);
+ __raw_writel(SSI_MODE_SLEEP, ssr + SSI_SSR_MODE_REG);
+ /* Stop all DMA transfers */
+ for (i = 0; i < SSI_MAX_GDD_LCH; i++) {
+ msg = omap_ssi->gdd_trn[i].msg;
+ if (!msg || (port != hsi_get_port(msg->cl)))
+ continue;
+ __raw_writew(0, omap_ssi->gdd + SSI_GDD_CCR_REG(i));
+ if (msg->ttype == HSI_MSG_READ)
+ ssi_clk_disable(ssi);
+ omap_ssi->gdd_trn[i].msg = NULL;
+ }
+ /* Flush all SST buffers */
+ __raw_writel(0, sst + SSI_SST_BUFSTATE_REG);
+ __raw_writel(0, sst + SSI_SST_TXSTATE_REG);
+ /* Flush all SSR buffers */
+ __raw_writel(0, ssr + SSI_SSR_RXSTATE_REG);
+ __raw_writel(0, ssr + SSI_SSR_BUFSTATE_REG);
+ /* Flush all errors */
+ err = __raw_readl(ssr + SSI_SSR_ERROR_REG);
+ __raw_writel(err, ssr + SSI_SSR_ERRORACK_REG);
+ /* Flush break */
+ __raw_writel(0, ssr + SSI_SSR_BREAK_REG);
+ /* Clear interrupts */
+ __raw_writel(0, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+ __raw_writel(0xffffff00,
+ omap_ssi->sys + SSI_MPU_STATUS_REG(port->num, 0));
+ __raw_writel(0, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
+ __raw_writel(0xff, omap_ssi->sys + SSI_GDD_MPU_IRQ_STATUS_REG);
+ /* Dequeue all pending requests */
+ for (i = 0; i < omap_port->channels; i++) {
+ /* Release write clocks */
+ if (!list_empty(&omap_port->txqueue[i]))
+ ssi_clk_disable(ssi);
+ ssi_flush_queue(&omap_port->txqueue[i], NULL);
+ ssi_flush_queue(&omap_port->rxqueue[i], NULL);
+ }
+ ssi_flush_queue(&omap_port->brkqueue, NULL);
+ /* Restart communications */
+ ssi_restore_port_mode(&port->device, NULL);
+ spin_unlock_bh(&omap_port->lock);
+ ssi_clk_disable(ssi);
+
+ return 0;
+}
+
+static int ssi_start_tx(struct hsi_client *cl)
+{
+ struct hsi_port *port = hsi_get_port(cl);
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+
+ dev_dbg(&port->device, "Wake out high %d\n", omap_port->wk_refcount);
+
+ spin_lock_bh(&omap_port->wk_lock);
+ if (omap_port->wk_refcount++) {
+ spin_unlock_bh(&omap_port->wk_lock);
+ return 0;
+ }
+ ssi_clk_enable(ssi); /* Grab clocks */
+ __raw_writel(SSI_WAKE(0), omap_ssi->sys + SSI_SET_WAKE_REG(port->num));
+ spin_unlock_bh(&omap_port->wk_lock);
+
+ return 0;
+}
+
+static int ssi_stop_tx(struct hsi_client *cl)
+{
+ struct hsi_port *port = hsi_get_port(cl);
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+
+ dev_dbg(&port->device, "Wake out low %d\n", omap_port->wk_refcount);
+
+ spin_lock_bh(&omap_port->wk_lock);
+ BUG_ON(!omap_port->wk_refcount);
+ if (--omap_port->wk_refcount) {
+ spin_unlock_bh(&omap_port->wk_lock);
+ return 0;
+ }
+ __raw_writel(SSI_WAKE(0),
+ omap_ssi->sys + SSI_CLEAR_WAKE_REG(port->num));
+ ssi_clk_disable(ssi); /* Release clocks */
+ spin_unlock_bh(&omap_port->wk_lock);
+
+ return 0;
+}
+
+static void ssi_pio_complete(struct hsi_port *port, struct list_head *queue)
+{
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct hsi_msg *msg;
+ u32 *buf;
+ u32 val;
+
+ spin_lock(&omap_port->lock);
+ msg = list_first_entry(queue, struct hsi_msg, link);
+ if ((!msg->sgt.nents) || (!msg->sgt.sgl->length)) {
+ msg->actual_len = 0;
+ msg->status = HSI_STATUS_PENDING;
+ }
+ if (msg->status == HSI_STATUS_PROCEDING) {
+ buf = sg_virt(msg->sgt.sgl) + msg->actual_len;
+ if (msg->ttype == HSI_MSG_WRITE)
+ __raw_writel(*buf, omap_port->sst_base +
+ SSI_SST_BUFFER_CH_REG(msg->channel));
+ else
+ *buf = __raw_readl(omap_port->ssr_base +
+ SSI_SSR_BUFFER_CH_REG(msg->channel));
+ dev_dbg(&port->device, "ch %d ttype %d 0x%08x\n", msg->channel,
+ msg->ttype, *buf);
+ msg->actual_len += sizeof(*buf);
+ if (msg->actual_len >= msg->sgt.sgl->length)
+ msg->status = HSI_STATUS_COMPLETED;
+ /*
+ * Wait for the last written frame to be really sent before
+ * we call the complete callback
+ */
+ if ((msg->status == HSI_STATUS_PROCEDING) ||
+ ((msg->status == HSI_STATUS_COMPLETED) &&
+ (msg->ttype == HSI_MSG_WRITE)))
+ goto out;
+
+ }
+ if (msg->status == HSI_STATUS_PROCEDING)
+ goto out;
+ /* Transfer completed at this point */
+ val = __raw_readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+ if (msg->ttype == HSI_MSG_WRITE) {
+ val &= ~SSI_DATAACCEPT(msg->channel);
+ ssi_clk_disable(ssi); /* Release clocks for write transfer */
+ } else {
+ val &= ~SSI_DATAAVAILABLE(msg->channel);
+ }
+ __raw_writel(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+ list_del(&msg->link);
+ spin_unlock(&omap_port->lock);
+ msg->complete(msg);
+ spin_lock(&omap_port->lock);
+ ssi_start_transfer(queue);
+out:
+ spin_unlock(&omap_port->lock);
+}
+
+static void ssi_gdd_complete(struct hsi_controller *ssi, unsigned int lch)
+{
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ struct hsi_msg *msg = omap_ssi->gdd_trn[lch].msg;
+ struct hsi_port *port = to_hsi_port(msg->cl->device.parent);
+ unsigned int dir;
+ u32 csr;
+ u32 val;
+
+ spin_lock(&omap_ssi->lock);
+
+ val = __raw_readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
+ val &= ~SSI_GDD_LCH(lch);
+ __raw_writel(val, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
+
+ if (msg->ttype == HSI_MSG_READ) {
+ dir = DMA_FROM_DEVICE;
+ val = SSI_DATAAVAILABLE(msg->channel);
+ ssi_clk_disable(ssi);
+ } else {
+ dir = DMA_TO_DEVICE;
+ val = SSI_DATAACCEPT(msg->channel);
+ /* Keep clocks reference for write pio event */
+ }
+ dma_unmap_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents, dir);
+ csr = __raw_readw(omap_ssi->gdd + SSI_GDD_CSR_REG(lch));
+ omap_ssi->gdd_trn[lch].msg = NULL; /* release GDD lch */
+ if (csr & SSI_CSR_TOUR) { /* Timeout error */
+ msg->status = HSI_STATUS_ERROR;
+ msg->actual_len = 0;
+ list_del(&msg->link); /* Dequeue msg */
+ spin_unlock(&omap_ssi->lock);
+ msg->complete(msg);
+ return;
+ }
+
+ val |= __raw_readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+ __raw_writel(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+
+ msg->status = HSI_STATUS_COMPLETED;
+ msg->actual_len = sg_dma_len(msg->sgt.sgl);
+ spin_unlock(&omap_ssi->lock);
+}
+
+static void ssi_gdd_tasklet(unsigned long dev)
+{
+ struct hsi_controller *ssi = (struct hsi_controller *)dev;
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ unsigned long sys = omap_ssi->sys;
+ unsigned int lch;
+ u32 status_reg;
+
+ ssi_clk_enable(ssi);
+
+ status_reg = __raw_readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG);
+ for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) {
+ if (status_reg & SSI_GDD_LCH(lch))
+ ssi_gdd_complete(ssi, lch);
+ }
+ __raw_writel(status_reg, sys + SSI_GDD_MPU_IRQ_STATUS_REG);
+ status_reg = __raw_readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG);
+ ssi_clk_disable(ssi);
+ if (status_reg)
+ tasklet_hi_schedule(&omap_ssi->gdd_tasklet);
+ else
+ enable_irq(omap_ssi->gdd_irq);
+
+}
+
+static irqreturn_t ssi_gdd_isr(int irq, void *ssi)
+{
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+
+ tasklet_hi_schedule(&omap_ssi->gdd_tasklet);
+ disable_irq_nosync(irq);
+
+ return IRQ_HANDLED;
+}
+
+static void ssi_pio_tasklet(unsigned long ssi_port)
+{
+ struct hsi_port *port = (struct hsi_port *)ssi_port;
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ unsigned long sys = omap_ssi->sys;
+ unsigned int ch;
+ u32 status_reg;
+
+ ssi_clk_enable(ssi);
+ status_reg = __raw_readl(sys + SSI_MPU_STATUS_REG(port->num, 0));
+ status_reg &= __raw_readl(sys + SSI_MPU_ENABLE_REG(port->num, 0));
+
+ for (ch = 0; ch < omap_port->channels; ch++) {
+ if (status_reg & SSI_DATAACCEPT(ch))
+ ssi_pio_complete(port, &omap_port->txqueue[ch]);
+ if (status_reg & SSI_DATAAVAILABLE(ch))
+ ssi_pio_complete(port, &omap_port->rxqueue[ch]);
+ }
+ if (status_reg & SSI_BREAKDETECTED)
+ ssi_break_complete(port);
+ if (status_reg & SSI_ERROROCCURED)
+ ssi_error(port);
+ __raw_writel(status_reg, sys + SSI_MPU_STATUS_REG(port->num, 0));
+
+ status_reg = __raw_readl(sys + SSI_MPU_STATUS_REG(port->num, 0));
+ status_reg &= __raw_readl(sys + SSI_MPU_ENABLE_REG(port->num, 0));
+ ssi_clk_disable(ssi);
+
+ if (status_reg)
+ tasklet_hi_schedule(&omap_port->pio_tasklet);
+ else
+ enable_irq(omap_port->irq);
+}
+
+static irqreturn_t ssi_pio_isr(int irq, void *port)
+{
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+
+ tasklet_hi_schedule(&omap_port->pio_tasklet);
+ disable_irq_nosync(irq);
+
+ return IRQ_HANDLED;
+}
+
+static void ssi_wake_tasklet(unsigned long ssi_port)
+{
+ struct hsi_port *port = (struct hsi_port *)ssi_port;
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+
+ if (ssi_wakein(port)) {
+ /**
+ * We can have a quick High-Low-High transition in the line.
+ * In such a case if we have long interrupt latencies,
+ * we can miss the low event or get twice a high event.
+ * This workaround will avoid breaking the clock reference
+ * count when such a situation occurs.
+ */
+ if (!omap_port->wkin_cken) {
+ omap_port->wkin_cken = 1;
+ ssi_clk_enable(ssi);
+ }
+ hsi_event(port, HSI_EVENT_START_RX);
+ } else {
+ hsi_event(port, HSI_EVENT_STOP_RX);
+ if (omap_port->wkin_cken) {
+ ssi_clk_disable(ssi);
+ omap_port->wkin_cken = 0;
+ }
+ }
+}
+
+static irqreturn_t ssi_wake_isr(int irq, void *ssi_port)
+{
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(ssi_port);
+
+ tasklet_hi_schedule(&omap_port->wake_tasklet);
+
+ return IRQ_HANDLED;
+}
+
+static int __init ssi_port_irq(struct hsi_port *port,
+ struct platform_device *pd)
+{
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct resource *irq;
+ int err;
+
+ irq = platform_get_resource(pd, IORESOURCE_IRQ, (port->num * 3) + 1);
+ if (!irq) {
+ dev_err(&port->device, "Port IRQ resource missing\n");
+ return -ENXIO;
+ }
+ omap_port->irq = irq->start;
+ tasklet_init(&omap_port->pio_tasklet, ssi_pio_tasklet,
+ (unsigned long)port);
+ err = devm_request_irq(&pd->dev, omap_port->irq, ssi_pio_isr,
+ IRQF_DISABLED, irq->name, port);
+ if (err < 0)
+ dev_err(&port->device, "Request IRQ %d failed (%d)\n",
+ omap_port->irq, err);
+ return err;
+}
+
+static int __init ssi_wake_irq(struct hsi_port *port,
+ struct platform_device *pd)
+{
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct resource *irq;
+ int err;
+
+ irq = platform_get_resource(pd, IORESOURCE_IRQ, (port->num * 3) + 3);
+ if (!irq) {
+ dev_err(&port->device, "Wake in IRQ resource missing");
+ return -ENXIO;
+ }
+ if (irq->flags & IORESOURCE_UNSET) {
+ dev_info(&port->device, "No Wake in support\n");
+ omap_port->wake_irq = -1;
+ return 0;
+ }
+ omap_port->wake_irq = irq->start;
+ tasklet_init(&omap_port->wake_tasklet, ssi_wake_tasklet,
+ (unsigned long)port);
+ err = devm_request_irq(&pd->dev, omap_port->wake_irq, ssi_wake_isr,
+ IRQF_DISABLED | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+ irq->name, port);
+ if (err < 0)
+ dev_err(&port->device, "Request Wake in IRQ %d failed (%d)\n",
+ omap_port->wake_irq, err);
+ return err;
+}
+
+static void __init ssi_queues_init(struct omap_ssi_port *omap_port)
+{
+ unsigned int ch;
+
+ for (ch = 0; ch < SSI_MAX_CHANNELS; ch++) {
+ INIT_LIST_HEAD(&omap_port->txqueue[ch]);
+ INIT_LIST_HEAD(&omap_port->rxqueue[ch]);
+ }
+ INIT_LIST_HEAD(&omap_port->brkqueue);
+}
+
+static int __init ssi_get_iomem(struct platform_device *pd,
+ unsigned int num, unsigned long *base, dma_addr_t *phy)
+{
+ struct resource *mem;
+ struct resource *ioarea;
+
+ mem = platform_get_resource(pd, IORESOURCE_MEM, num);
+ if (!mem) {
+ dev_err(&pd->dev, "IO memory region missing (%d)\n", num);
+ return -ENXIO;
+ }
+ ioarea = devm_request_mem_region(&pd->dev, mem->start,
+ (mem->end - mem->start) + 1, dev_name(&pd->dev));
+ if (!ioarea) {
+ dev_err(&pd->dev, "%s IO memory region request failed\n",
+ mem->name);
+ return -ENXIO;
+ }
+ *base = (unsigned long)devm_ioremap(&pd->dev, mem->start,
+ (mem->end - mem->start) + 1);
+ if (!base) {
+ dev_err(&pd->dev, "%s IO remap failed\n", mem->name);
+ return -ENXIO;
+ }
+ if (phy)
+ *phy = mem->start;
+
+ return 0;
+}
+
+static int __init ssi_ports_init(struct hsi_controller *ssi,
+ struct platform_device *pd)
+{
+ struct hsi_port *port;
+ struct omap_ssi_port *omap_port;
+ unsigned int i;
+ int err;
+
+ for (i = 0; i < ssi->num_ports; i++) {
+ port = &ssi->port[i];
+ omap_port = devm_kzalloc(&pd->dev, sizeof(*omap_port),
+ GFP_KERNEL);
+ if (!omap_port)
+ return -ENOMEM;
+ port->async = ssi_async;
+ port->setup = ssi_setup;
+ port->flush = ssi_flush;
+ port->start_tx = ssi_start_tx;
+ port->stop_tx = ssi_stop_tx;
+ port->release = ssi_release;
+ hsi_port_set_drvdata(port, omap_port);
+ /* Get SST base addresses*/
+ err = ssi_get_iomem(pd, ((i * 2) + 2), &omap_port->sst_base,
+ &omap_port->sst_dma);
+ if (err < 0)
+ return err;
+ /* Get SSR base addresses */
+ err = ssi_get_iomem(pd, ((i * 2) + 3), &omap_port->ssr_base,
+ &omap_port->ssr_dma);
+ if (err < 0)
+ return err;
+ err = ssi_port_irq(port, pd);
+ if (err < 0)
+ return err;
+ err = ssi_wake_irq(port, pd);
+ if (err < 0)
+ return err;
+ ssi_queues_init(omap_port);
+ spin_lock_init(&omap_port->lock);
+ spin_lock_init(&omap_port->wk_lock);
+ }
+
+ return 0;
+}
+
+static void ssi_ports_exit(struct hsi_controller *ssi)
+{
+ struct omap_ssi_port *omap_port;
+ unsigned int i;
+
+ for (i = 0; i < ssi->num_ports; i++) {
+ omap_port = hsi_port_drvdata(&ssi->port[i]);
+ WARN_ON(omap_port->wk_refcount != 0);
+ tasklet_kill(&omap_port->wake_tasklet);
+ tasklet_kill(&omap_port->pio_tasklet);
+ }
+}
+
+static int __init ssi_clk_get(struct hsi_controller *ssi)
+{
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ int err;
+
+ omap_ssi->ick = clk_get(&ssi->device, "ssi_ick");
+ if (IS_ERR(omap_ssi->ick)) {
+ dev_err(&ssi->device, "Interface clock missing\n");
+ return PTR_ERR(omap_ssi->ick);
+ }
+ omap_ssi->fck = clk_get(&ssi->device, "ssi_ssr_fck");
+ if (IS_ERR(omap_ssi->fck)) {
+ dev_err(&ssi->device, "Functional clock missing\n");
+ err = PTR_ERR(omap_ssi->fck);
+ goto out1;
+ }
+
+ return 0;
+out1:
+ clk_put(omap_ssi->ick);
+
+ return err;
+}
+
+static void ssi_clk_put(struct hsi_controller *ssi)
+{
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+
+ WARN_ON(omap_ssi->ck_refcount != 0);
+
+ clk_put(omap_ssi->ick);
+ clk_put(omap_ssi->fck);
+}
+
+static int __init ssi_add_controller(struct hsi_controller *ssi,
+ struct platform_device *pd)
+{
+ struct omap_ssi_platform_data *omap_ssi_pdata = pd->dev.platform_data;
+ struct omap_ssi_controller *omap_ssi;
+ struct resource *irq;
+ int err;
+
+ omap_ssi = devm_kzalloc(&pd->dev, sizeof(*omap_ssi), GFP_KERNEL);
+ if (!omap_ssi) {
+ dev_err(&pd->dev, "not enough memory for omap ssi\n");
+ return -ENOMEM;
+ }
+ ssi->id = pd->id;
+ ssi->device.parent = &pd->dev;
+ dev_set_name(&ssi->device, "ssi%d", ssi->id);
+ hsi_controller_set_drvdata(ssi, omap_ssi);
+ omap_ssi->dev = &ssi->device;
+ err = ssi_get_iomem(pd, 0, &omap_ssi->sys, NULL);
+ if (err < 0)
+ return err;
+ err = ssi_get_iomem(pd, 1, &omap_ssi->gdd, NULL);
+ if (err < 0)
+ return err;
+ irq = platform_get_resource(pd, IORESOURCE_IRQ, 0);
+ if (!irq) {
+ dev_err(&pd->dev, "GDD IRQ resource missing\n");
+ return -ENXIO;
+ }
+ omap_ssi->gdd_irq = irq->start;
+ tasklet_init(&omap_ssi->gdd_tasklet, ssi_gdd_tasklet,
+ (unsigned long)ssi);
+ err = devm_request_irq(&pd->dev, omap_ssi->gdd_irq, ssi_gdd_isr,
+ IRQF_DISABLED, irq->name, ssi);
+ if (err < 0) {
+ dev_err(&ssi->device, "Request GDD IRQ %d failed (%d)",
+ omap_ssi->gdd_irq, err);
+ return err;
+ }
+ err = ssi_ports_init(ssi, pd);
+ if (err < 0)
+ return err;
+ omap_ssi->get_loss = omap_ssi_pdata->get_dev_context_loss_count;
+ spin_lock_init(&omap_ssi->lock);
+ spin_lock_init(&omap_ssi->ck_lock);
+
+ err = ssi_clk_get(ssi);
+ if (err < 0)
+ return err;
+
+ err = hsi_register_controller(ssi);
+ if (err < 0)
+ ssi_clk_put(ssi);
+
+ return err;
+}
+
+static int __init ssi_hw_init(struct hsi_controller *ssi)
+{
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ unsigned int i;
+ u32 val;
+ int err;
+
+ err = ssi_clk_enable(ssi);
+ if (err < 0) {
+ dev_err(&ssi->device, "Failed to enable the clocks %d\n", err);
+ return err;
+ }
+ /* Reseting SSI controller */
+ __raw_writel(SSI_SOFTRESET, omap_ssi->sys + SSI_SYSCONFIG_REG);
+ val = __raw_readl(omap_ssi->sys + SSI_SYSSTATUS_REG);
+ for (i = 0; ((i < 20) && !(val & SSI_RESETDONE)); i++) {
+ msleep(10);
+ val = __raw_readl(omap_ssi->sys + SSI_SYSSTATUS_REG);
+ }
+ if (!(val & SSI_RESETDONE)) {
+ dev_err(&ssi->device, "SSI HW reset failed\n");
+ ssi_clk_disable(ssi);
+ return -EIO;
+ }
+ /* Reseting GDD */
+ __raw_writel(SSI_SWRESET, omap_ssi->gdd + SSI_GDD_GRST_REG);
+ /* Get FCK rate */
+ omap_ssi->fck_rate = (u32)clk_get_rate(omap_ssi->fck) / 1000; /* KHz */
+ dev_dbg(&ssi->device, "SSI fck rate %d KHz\n", omap_ssi->fck_rate);
+ /* Set default PM settings */
+ val = SSI_AUTOIDLE | SSI_SIDLEMODE_SMART | SSI_MIDLEMODE_SMART;
+ __raw_writel(val, omap_ssi->sys + SSI_SYSCONFIG_REG);
+ omap_ssi->sysconfig = val;
+ __raw_writel(SSI_CLK_AUTOGATING_ON, omap_ssi->sys + SSI_GDD_GCR_REG);
+ omap_ssi->gdd_gcr = SSI_CLK_AUTOGATING_ON;
+ ssi_clk_disable(ssi);
+
+ return 0;
+}
+
+static void ssi_remove_controller(struct hsi_controller *ssi)
+{
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+
+ ssi_ports_exit(ssi);
+ tasklet_kill(&omap_ssi->gdd_tasklet);
+ ssi_clk_put(ssi);
+ hsi_unregister_controller(ssi);
+}
+
+static int __init ssi_probe(struct platform_device *pd)
+{
+ struct omap_ssi_platform_data *omap_ssi_pdata = pd->dev.platform_data;
+ struct hsi_controller *ssi;
+ int err;
+
+ if (!omap_ssi_pdata) {
+ dev_err(&pd->dev, "No OMAP SSI platform data\n");
+ return -EINVAL;
+ }
+ ssi = hsi_alloc_controller(omap_ssi_pdata->num_ports, GFP_KERNEL);
+ if (!ssi) {
+ dev_err(&pd->dev, "No memory for controller\n");
+ return -ENOMEM;
+ }
+ platform_set_drvdata(pd, ssi);
+ err = ssi_add_controller(ssi, pd);
+ if (err < 0)
+ goto out1;
+ err = ssi_hw_init(ssi);
+ if (err < 0)
+ goto out2;
+#ifdef CONFIG_DEBUG_FS
+ err = ssi_debug_add_ctrl(ssi);
+ if (err < 0)
+ goto out2;
+#endif
+ return err;
+out2:
+ ssi_remove_controller(ssi);
+out1:
+ platform_set_drvdata(pd, NULL);
+ hsi_free_controller(ssi);
+
+ return err;
+}
+
+static int __exit ssi_remove(struct platform_device *pd)
+{
+ struct hsi_controller *ssi = platform_get_drvdata(pd);
+
+#ifdef CONFIG_DEBUG_FS
+ ssi_debug_remove_ctrl(ssi);
+#endif
+ ssi_remove_controller(ssi);
+ platform_set_drvdata(pd, NULL);
+ hsi_free_controller(ssi);
+
+ return 0;
+}
+
+static struct platform_driver ssi_pdriver = {
+ .remove = __exit_p(ssi_remove),
+ .driver = {
+ .name = "omap_ssi",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init omap_ssi_init(void)
+{
+ pr_info("OMAP SSI hw driver loaded\n");
+ return platform_driver_probe(&ssi_pdriver, ssi_probe);
+}
+module_init(omap_ssi_init);
+
+static void __exit omap_ssi_exit(void)
+{
+ platform_driver_unregister(&ssi_pdriver);
+ pr_info("OMAP SSI driver removed\n");
+}
+module_exit(omap_ssi_exit);
+
+MODULE_ALIAS("platform:omap_ssi");
+MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>");
+MODULE_DESCRIPTION("Synchronous Serial Interface Driver");
+MODULE_LICENSE("GPL");
--
1.5.6.5
^ permalink raw reply related [flat|nested] 17+ messages in thread* [RFC PATCHv2 4/7] HSI CHAR: Add HSI char device driver
2010-05-07 15:18 [RFC PATCHv2 0/7] HSI framework and drivers Carlos Chinea
` (2 preceding siblings ...)
2010-05-07 15:18 ` [RFC PATCHv2 3/7] OMAP SSI: Add OMAP SSI to the kernel configuration Carlos Chinea
@ 2010-05-07 15:18 ` Carlos Chinea
2010-05-07 15:18 ` [RFC PATCHv2 5/7] HSI CHAR: Add HSI char device kernel configuration Carlos Chinea
` (2 subsequent siblings)
6 siblings, 0 replies; 17+ messages in thread
From: Carlos Chinea @ 2010-05-07 15:18 UTC (permalink / raw)
To: linux-kernel; +Cc: linux-omap, Andras Domokos
From: Andras Domokos <andras.domokos@nokia.com>
Add HSI char device driver to the kernel.
Signed-off-by: Andras Domokos <andras.domokos@nokia.com>
---
drivers/hsi/clients/hsi_char.c | 1053 ++++++++++++++++++++++++++++++++++++++++
include/linux/hsi/hsi_char.h | 66 +++
2 files changed, 1119 insertions(+), 0 deletions(-)
create mode 100644 drivers/hsi/clients/hsi_char.c
create mode 100644 include/linux/hsi/hsi_char.h
diff --git a/drivers/hsi/clients/hsi_char.c b/drivers/hsi/clients/hsi_char.c
new file mode 100644
index 0000000..bc93356
--- /dev/null
+++ b/drivers/hsi/clients/hsi_char.c
@@ -0,0 +1,1053 @@
+/*
+ * hsi-char.c
+ *
+ * HSI character device driver, implements the character device
+ * interface.
+ *
+ * Copyright (C) 2010 Nokia Corporation. All rights reserved.
+ *
+ * Contact: Andras Domokos <andras.domokos@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <asm/atomic.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/poll.h>
+#include <linux/ioctl.h>
+#include <linux/wait.h>
+#include <linux/fs.h>
+#include <linux/sched.h>
+#include <linux/device.h>
+#include <linux/cdev.h>
+#include <linux/uaccess.h>
+#include <linux/scatterlist.h>
+#include <linux/hsi/hsi.h>
+#include <linux/hsi/hsi_char.h>
+
+#define HSI_CHAR_CHANNELS 8
+#define HSI_CHAR_DEVS 8
+#define HSI_CHAR_MSGS 4
+
+#define HSI_CHST_UNAVAIL 0 /* SBZ! */
+#define HSI_CHST_AVAIL 1
+
+#define HSI_CHST_CLOSED (0 << 4)
+#define HSI_CHST_CLOSING (1 << 4)
+#define HSI_CHST_OPENING (2 << 4)
+#define HSI_CHST_OPENED (3 << 4)
+
+#define HSI_CHST_READOFF (0 << 8)
+#define HSI_CHST_READON (1 << 8)
+#define HSI_CHST_READING (2 << 8)
+
+#define HSI_CHST_WRITEOFF (0 << 12)
+#define HSI_CHST_WRITEON (1 << 12)
+#define HSI_CHST_WRITING (2 << 12)
+
+#define HSI_CHST_OC_MASK 0xf0
+#define HSI_CHST_RD_MASK 0xf00
+#define HSI_CHST_WR_MASK 0xf000
+
+#define HSI_CHST_OC(c) ((c)->state & HSI_CHST_OC_MASK)
+#define HSI_CHST_RD(c) ((c)->state & HSI_CHST_RD_MASK)
+#define HSI_CHST_WR(c) ((c)->state & HSI_CHST_WR_MASK)
+
+#define HSI_CHST_OC_SET(c, v) \
+ do { \
+ (c)->state &= ~HSI_CHST_OC_MASK; \
+ (c)->state |= v; \
+ } while (0);
+
+#define HSI_CHST_RD_SET(c, v) \
+ do { \
+ (c)->state &= ~HSI_CHST_RD_MASK; \
+ (c)->state |= v; \
+ } while (0);
+
+#define HSI_CHST_WR_SET(c, v) \
+ do { \
+ (c)->state &= ~HSI_CHST_WR_MASK; \
+ (c)->state |= v; \
+ } while (0);
+
+#define HSI_CHAR_POLL_RST (-1)
+#define HSI_CHAR_POLL_OFF 0
+#define HSI_CHAR_POLL_ON 1
+
+#define HSI_CHAR_RX 0
+#define HSI_CHAR_TX 1
+
+struct hsi_char_channel {
+ int ch;
+ unsigned int state;
+ int wlrefcnt;
+ int rxpoll;
+ struct hsi_client *cl;
+ struct list_head free_msgs_list;
+ struct list_head rx_msgs_queue;
+ struct list_head tx_msgs_queue;
+ int poll_event;
+ spinlock_t lock;
+ struct fasync_struct *async_queue;
+ wait_queue_head_t rx_wait;
+ wait_queue_head_t tx_wait;
+};
+
+struct hsi_char_client_data {
+ atomic_t refcnt;
+ int attached;
+ atomic_t breq;
+ struct hsi_char_channel channels[HSI_CHAR_DEVS];
+};
+
+static unsigned int max_data_size = 0x1000;
+module_param(max_data_size, uint, 1);
+MODULE_PARM_DESC(max_data_size, "max read/write data size [4,8..65536] (^2)");
+
+static int channels_map[HSI_CHAR_DEVS] = {0, -1, -1 , -1, -1, -1, -1, -1};
+module_param_array(channels_map, int, NULL, 0);
+MODULE_PARM_DESC(channels_map, "Array of HSI channels ([0...7]) to be probed");
+
+static dev_t hsi_char_dev;
+static struct hsi_char_client_data hsi_char_cl_data;
+
+static int hsi_char_rx_poll(struct hsi_char_channel *channel);
+
+static int __devinit hsi_char_probe(struct device *dev)
+{
+ struct hsi_char_client_data *cl_data = &hsi_char_cl_data;
+ struct hsi_char_channel *channel = cl_data->channels;
+ struct hsi_client *cl = to_hsi_client(dev);
+ int i;
+
+ for (i = 0; i < HSI_CHAR_DEVS; i++) {
+ if (channel->state == HSI_CHST_AVAIL)
+ channel->cl = cl;
+ channel++;
+ }
+ cl->hsi_start_rx = NULL;
+ cl->hsi_stop_rx = NULL;
+ atomic_set(&cl_data->refcnt, 0);
+ atomic_set(&cl_data->breq, 1);
+ cl_data->attached = 0;
+ hsi_client_set_drvdata(cl, cl_data);
+
+ return 0;
+}
+
+static int __devexit hsi_char_remove(struct device *dev)
+{
+ struct hsi_client *cl = to_hsi_client(dev);
+ struct hsi_char_client_data *cl_data = hsi_client_drvdata(cl);
+ struct hsi_char_channel *channel = cl_data->channels;
+ int i;
+
+ for (i = 0; i < HSI_CHAR_DEVS; i++) {
+ if (!(channel->state & HSI_CHST_AVAIL))
+ continue;
+ if (cl_data->attached) {
+ hsi_release_port(channel->cl);
+ cl_data->attached = 0;
+ }
+ channel->state = HSI_CHST_UNAVAIL;
+ channel->cl = NULL;
+ channel++;
+ }
+
+ return 0;
+}
+
+static int hsi_char_fasync(int fd, struct file *file, int on)
+{
+ struct hsi_char_channel *channel = file->private_data;
+
+ if (fasync_helper(fd, file, on, &channel->async_queue) < 0)
+ return -EIO;
+
+ return 0;
+}
+
+static unsigned int hsi_char_poll(struct file *file, poll_table *wait)
+{
+ struct hsi_char_channel *channel = file->private_data;
+ unsigned int ret;
+
+ spin_lock_bh(&channel->lock);
+ poll_wait(file, &channel->rx_wait, wait);
+ poll_wait(file, &channel->tx_wait, wait);
+ ret = channel->poll_event;
+ spin_unlock_bh(&channel->lock);
+ hsi_char_rx_poll(channel);
+
+ return ret;
+}
+
+static inline void hsi_char_msg_len_set(struct hsi_msg *msg, unsigned int len)
+{
+ msg->sgt.sgl->length = len;
+}
+
+static inline unsigned int hsi_char_msg_len_get(struct hsi_msg *msg)
+{
+ return msg->sgt.sgl->length;
+}
+
+static void hsi_char_data_available(struct hsi_msg *msg)
+{
+ struct hsi_char_client_data *cl_data = hsi_client_drvdata(msg->cl);
+ struct hsi_char_channel *channel = cl_data->channels + msg->channel;
+ int ret;
+
+ if (msg->status == HSI_STATUS_ERROR) {
+ ret = hsi_async_read(channel->cl, msg);
+ if (ret < 0) {
+ list_add_tail(&msg->link, &channel->free_msgs_list);
+ spin_lock_bh(&channel->lock);
+ list_add_tail(&msg->link, &channel->free_msgs_list);
+ channel->rxpoll = HSI_CHAR_POLL_OFF;
+ spin_unlock_bh(&channel->lock);
+ }
+ } else {
+ spin_lock_bh(&channel->lock);
+ channel->rxpoll = HSI_CHAR_POLL_OFF;
+ channel->poll_event |= (POLLIN | POLLRDNORM);
+ spin_unlock_bh(&channel->lock);
+ spin_lock_bh(&channel->lock);
+ list_add_tail(&msg->link, &channel->free_msgs_list);
+ spin_unlock_bh(&channel->lock);
+ wake_up_interruptible(&channel->rx_wait);
+ }
+}
+
+static void hsi_char_rx_poll_destructor(struct hsi_msg *msg)
+{
+ struct hsi_char_client_data *cl_data = hsi_client_drvdata(msg->cl);
+ struct hsi_char_channel *channel = cl_data->channels + msg->channel;
+
+ spin_lock_bh(&channel->lock);
+ list_add_tail(&msg->link, &channel->free_msgs_list);
+ channel->rxpoll = HSI_CHAR_POLL_RST;
+ spin_unlock_bh(&channel->lock);
+}
+
+static int hsi_char_rx_poll(struct hsi_char_channel *channel)
+{
+ struct hsi_msg *msg;
+ int ret = 0;
+
+ spin_lock_bh(&channel->lock);
+ if (list_empty(&channel->free_msgs_list)) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ if (channel->rxpoll == HSI_CHAR_POLL_ON)
+ goto out;
+ msg = list_first_entry(&channel->free_msgs_list, struct hsi_msg, link);
+ list_del(&msg->link);
+ channel->rxpoll = HSI_CHAR_POLL_ON;
+ spin_unlock_bh(&channel->lock);
+ hsi_char_msg_len_set(msg, 0);
+ msg->complete = hsi_char_data_available;
+ msg->destructor = hsi_char_rx_poll_destructor;
+ /* don't touch msg->context! */
+ ret = hsi_async_read(channel->cl, msg);
+ spin_lock_bh(&channel->lock);
+ if (ret < 0) {
+ list_add_tail(&msg->link, &channel->free_msgs_list);
+ channel->rxpoll = HSI_CHAR_POLL_OFF;
+ goto out;
+ }
+out:
+ spin_unlock_bh(&channel->lock);
+
+ return ret;
+}
+
+static void hsi_char_rx_poll_rst(struct hsi_client *cl)
+{
+ struct hsi_char_client_data *cl_data = hsi_client_drvdata(cl);
+ struct hsi_char_channel *channel = cl_data->channels;
+ int i;
+
+ for (i = 0; i < HSI_CHAR_DEVS; i++) {
+ if ((HSI_CHST_OC(channel) == HSI_CHST_OPENED) &&
+ (channel->rxpoll == HSI_CHAR_POLL_RST))
+ hsi_char_rx_poll(channel);
+ channel++;
+ }
+}
+
+static void hsi_char_rx_completed(struct hsi_msg *msg)
+{
+ struct hsi_char_client_data *cl_data = hsi_client_drvdata(msg->cl);
+ struct hsi_char_channel *channel = cl_data->channels + msg->channel;
+
+ spin_lock_bh(&channel->lock);
+ list_add_tail(&msg->link, &channel->rx_msgs_queue);
+ spin_unlock_bh(&channel->lock);
+ wake_up_interruptible(&channel->rx_wait);
+}
+
+static void hsi_char_rx_msg_destructor(struct hsi_msg *msg)
+{
+ struct hsi_char_client_data *cl_data = hsi_client_drvdata(msg->cl);
+ struct hsi_char_channel *channel = cl_data->channels + msg->channel;
+
+ spin_lock_bh(&channel->lock);
+ list_add_tail(&msg->link, &channel->free_msgs_list);
+ HSI_CHST_RD_SET(channel, HSI_CHST_READOFF);
+ spin_unlock_bh(&channel->lock);
+}
+
+static void hsi_char_rx_cancel(struct hsi_char_channel *channel)
+{
+ hsi_flush(channel->cl);
+ hsi_char_rx_poll_rst(channel->cl);
+}
+
+static void hsi_char_tx_completed(struct hsi_msg *msg)
+{
+ struct hsi_char_client_data *cl_data = hsi_client_drvdata(msg->cl);
+ struct hsi_char_channel *channel = cl_data->channels + msg->channel;
+
+ spin_lock_bh(&channel->lock);
+ list_add_tail(&msg->link, &channel->tx_msgs_queue);
+ channel->poll_event |= (POLLOUT | POLLWRNORM);
+ spin_unlock_bh(&channel->lock);
+ wake_up_interruptible(&channel->tx_wait);
+}
+
+static void hsi_char_tx_msg_destructor(struct hsi_msg *msg)
+{
+ struct hsi_char_client_data *cl_data = hsi_client_drvdata(msg->cl);
+ struct hsi_char_channel *channel = cl_data->channels + msg->channel;
+
+ spin_lock_bh(&channel->lock);
+ list_add_tail(&msg->link, &channel->free_msgs_list);
+ HSI_CHST_WR_SET(channel, HSI_CHST_WRITEOFF);
+ spin_unlock_bh(&channel->lock);
+}
+
+static void hsi_char_tx_cancel(struct hsi_char_channel *channel)
+{
+ hsi_flush(channel->cl);
+ hsi_char_rx_poll_rst(channel->cl);
+}
+
+static ssize_t hsi_char_read(struct file *file, char __user *buf,
+ size_t len, loff_t *ppos)
+{
+ struct hsi_char_channel *channel = file->private_data;
+ struct hsi_msg *msg = NULL;
+ ssize_t ret;
+
+ if (len == 0) {
+ channel->poll_event &= ~POLLPRI;
+ return 0;
+ }
+ channel->poll_event &= ~POLLPRI;
+
+ if (!IS_ALIGNED(len, sizeof(u32)))
+ return -EINVAL;
+
+ if (len > max_data_size)
+ len = max_data_size;
+
+ spin_lock_bh(&channel->lock);
+ if (HSI_CHST_RD(channel) != HSI_CHST_READOFF) {
+ ret = -EBUSY;
+ goto out;
+ }
+ if (list_empty(&channel->free_msgs_list)) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ msg = list_first_entry(&channel->free_msgs_list, struct hsi_msg, link);
+ list_del(&msg->link);
+ spin_unlock_bh(&channel->lock);
+ hsi_char_msg_len_set(msg, len);
+ msg->complete = hsi_char_rx_completed;
+ msg->destructor = hsi_char_rx_msg_destructor;
+ ret = hsi_async_read(channel->cl, msg);
+ spin_lock_bh(&channel->lock);
+ if (ret < 0)
+ goto out;
+ HSI_CHST_RD_SET(channel, HSI_CHST_READING);
+ msg = NULL;
+
+ for ( ; ; ) {
+ DEFINE_WAIT(wait);
+
+ if (!list_empty(&channel->rx_msgs_queue)) {
+ msg = list_first_entry(&channel->rx_msgs_queue,
+ struct hsi_msg, link);
+ HSI_CHST_RD_SET(channel, HSI_CHST_READOFF);
+ channel->poll_event &= ~(POLLIN | POLLRDNORM);
+ list_del(&msg->link);
+ spin_unlock_bh(&channel->lock);
+ if (msg->status == HSI_STATUS_ERROR) {
+ ret = -EIO;
+ } else {
+ ret = copy_to_user((void __user *)buf,
+ msg->context,
+ hsi_char_msg_len_get(msg));
+ if (ret)
+ ret = -EFAULT;
+ else
+ ret = hsi_char_msg_len_get(msg);
+ }
+ spin_lock_bh(&channel->lock);
+ break;
+ } else if (signal_pending(current)) {
+ spin_unlock_bh(&channel->lock);
+ hsi_char_rx_cancel(channel);
+ spin_lock_bh(&channel->lock);
+ HSI_CHST_RD_SET(channel, HSI_CHST_READOFF);
+ ret = -EINTR;
+ break;
+ }
+
+ prepare_to_wait(&channel->rx_wait, &wait, TASK_INTERRUPTIBLE);
+ spin_unlock_bh(&channel->lock);
+
+ schedule();
+
+ spin_lock_bh(&channel->lock);
+ finish_wait(&channel->rx_wait, &wait);
+ }
+out:
+ if (msg)
+ list_add_tail(&msg->link, &channel->free_msgs_list);
+ spin_unlock_bh(&channel->lock);
+
+ return ret;
+}
+
+static ssize_t hsi_char_write(struct file *file, const char __user *buf,
+ size_t len, loff_t *ppos)
+{
+ struct hsi_char_channel *channel = file->private_data;
+ struct hsi_msg *msg = NULL;
+ ssize_t ret;
+
+ if ((len == 0) || !IS_ALIGNED(len, sizeof(u32)))
+ return -EINVAL;
+
+ if (len > max_data_size)
+ len = max_data_size;
+
+ spin_lock_bh(&channel->lock);
+ if (HSI_CHST_WR(channel) != HSI_CHST_WRITEOFF) {
+ ret = -EBUSY;
+ goto out;
+ }
+ if (list_empty(&channel->free_msgs_list)) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ msg = list_first_entry(&channel->free_msgs_list, struct hsi_msg, link);
+ list_del(&msg->link);
+ HSI_CHST_WR_SET(channel, HSI_CHST_WRITEON);
+ spin_unlock_bh(&channel->lock);
+
+ if (copy_from_user(msg->context, (void __user *)buf, len)) {
+ spin_lock_bh(&channel->lock);
+ HSI_CHST_WR_SET(channel, HSI_CHST_WRITEOFF);
+ ret = -EFAULT;
+ goto out;
+ }
+
+ hsi_char_msg_len_set(msg, len);
+ msg->complete = hsi_char_tx_completed;
+ msg->destructor = hsi_char_tx_msg_destructor;
+ channel->poll_event &= ~(POLLOUT | POLLWRNORM);
+ ret = hsi_async_write(channel->cl, msg);
+ spin_lock_bh(&channel->lock);
+ if (ret < 0) {
+ channel->poll_event |= (POLLOUT | POLLWRNORM);
+ HSI_CHST_WR_SET(channel, HSI_CHST_WRITEOFF);
+ goto out;
+ }
+ HSI_CHST_WR_SET(channel, HSI_CHST_WRITING);
+ msg = NULL;
+
+ for ( ; ; ) {
+ DEFINE_WAIT(wait);
+
+ if (!list_empty(&channel->tx_msgs_queue)) {
+ msg = list_first_entry(&channel->tx_msgs_queue,
+ struct hsi_msg, link);
+ list_del(&msg->link);
+ HSI_CHST_WR_SET(channel, HSI_CHST_WRITEOFF);
+ if (msg->status == HSI_STATUS_ERROR)
+ ret = -EIO;
+ else
+ ret = hsi_char_msg_len_get(msg);
+ break;
+ } else if (signal_pending(current)) {
+ spin_unlock_bh(&channel->lock);
+ hsi_char_tx_cancel(channel);
+ spin_lock_bh(&channel->lock);
+ HSI_CHST_WR_SET(channel, HSI_CHST_WRITEOFF);
+ ret = -EINTR;
+ break;
+ }
+ prepare_to_wait(&channel->tx_wait, &wait, TASK_INTERRUPTIBLE);
+ spin_unlock_bh(&channel->lock);
+
+ schedule();
+
+ spin_lock_bh(&channel->lock);
+ finish_wait(&channel->tx_wait, &wait);
+ }
+out:
+ if (msg)
+ list_add_tail(&msg->link, &channel->free_msgs_list);
+
+ spin_unlock_bh(&channel->lock);
+
+ return ret;
+}
+
+static void hsi_char_bcast_break(struct hsi_client *cl)
+{
+ struct hsi_char_client_data *cl_data = hsi_client_drvdata(cl);
+ struct hsi_char_channel *channel = cl_data->channels;
+ int i;
+
+ for (i = 0; i < HSI_CHAR_DEVS; i++) {
+ if (HSI_CHST_OC(channel) != HSI_CHST_OPENED)
+ continue;
+ channel->poll_event |= POLLPRI;
+ wake_up_interruptible(&channel->rx_wait);
+ wake_up_interruptible(&channel->tx_wait);
+ channel++;
+ }
+}
+
+static void hsi_char_break_received(struct hsi_msg *msg)
+{
+ struct hsi_char_client_data *cl_data = hsi_client_drvdata(msg->cl);
+ int ret;
+
+ hsi_char_bcast_break(msg->cl);
+ ret = hsi_async_read(msg->cl, msg);
+ if (ret < 0) {
+ hsi_free_msg(msg);
+ atomic_inc(&cl_data->breq);
+ }
+}
+
+static void hsi_char_break_req_destructor(struct hsi_msg *msg)
+{
+ struct hsi_char_client_data *cl_data = hsi_client_drvdata(msg->cl);
+
+ hsi_free_msg(msg);
+ atomic_inc(&cl_data->breq);
+}
+
+static int hsi_char_break_request(struct hsi_client *cl)
+{
+ struct hsi_char_client_data *cl_data = hsi_client_drvdata(cl);
+ struct hsi_msg *msg;
+ int ret = 0;
+
+ if (!atomic_dec_and_test(&cl_data->breq)) {
+ atomic_inc(&cl_data->breq);
+ return -EBUSY;
+ }
+ msg = hsi_alloc_msg(0, GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+ msg->break_frame = 1;
+ msg->complete = hsi_char_break_received;
+ msg->destructor = hsi_char_break_req_destructor;
+ ret = hsi_async_read(cl, msg);
+ if (ret < 0)
+ hsi_free_msg(msg);
+
+ return ret;
+}
+
+static int hsi_char_break_send(struct hsi_client *cl)
+{
+ struct hsi_msg *msg;
+ int ret = 0;
+
+ msg = hsi_alloc_msg(0, GFP_ATOMIC);
+ if (!msg)
+ return -ENOMEM;
+ msg->break_frame = 1;
+ msg->complete = hsi_free_msg;
+ msg->destructor = hsi_free_msg;
+ ret = hsi_async_write(cl, msg);
+ if (ret < 0)
+ hsi_free_msg(msg);
+
+ return ret;
+}
+
+static void hsi_char_reset(struct hsi_client *cl)
+{
+ hsi_flush(cl);
+ hsi_char_rx_poll_rst(cl);
+}
+
+static inline int ssi_check_common_cfg(struct hsi_config *cfg)
+{
+ if ((cfg->mode != HSI_MODE_STREAM) && (cfg->mode != HSI_MODE_FRAME))
+ return -EINVAL;
+ if ((cfg->channels == 0) || (cfg->channels > HSI_CHAR_CHANNELS))
+ return -EINVAL;
+ if (cfg->channels & (cfg->channels - 1))
+ return -EINVAL;
+ if ((cfg->flow != HSI_FLOW_SYNC) && (cfg->flow != HSI_FLOW_PIPE))
+ return -EINVAL;
+
+ return 0;
+}
+
+static inline int ssi_check_rx_cfg(struct hsi_config *cfg)
+{
+ return ssi_check_common_cfg(cfg);
+}
+
+static inline int ssi_check_tx_cfg(struct hsi_config *cfg)
+{
+ int ret = ssi_check_common_cfg(cfg);
+
+ if (ret < 0)
+ return ret;
+ if ((cfg->arb_mode != HSI_ARB_RR) && (cfg->arb_mode != HSI_ARB_PRIO))
+ return -EINVAL;
+
+ return 0;
+}
+
+static inline int hsi_char_cfg_set(struct hsi_client *cl,
+ struct hsi_config *cfg, int dir)
+{
+ struct hsi_config *rxtx_cfg;
+ int ret = 0;
+
+ if (dir == HSI_CHAR_RX) {
+ rxtx_cfg = &cl->rx_cfg;
+ ret = ssi_check_rx_cfg(cfg);
+ } else {
+ rxtx_cfg = &cl->tx_cfg;
+ ret = ssi_check_tx_cfg(cfg);
+ }
+ if (ret < 0)
+ return ret;
+
+ *rxtx_cfg = *cfg;
+ ret = hsi_setup(cl);
+ if (ret < 0)
+ return ret;
+
+ if ((dir == HSI_CHAR_RX) && (cfg->mode == HSI_MODE_FRAME))
+ hsi_char_break_request(cl);
+
+ return ret;
+}
+
+static inline void hsi_char_cfg_get(struct hsi_client *cl,
+ struct hsi_config *cfg, int dir)
+{
+ struct hsi_config *rxtx_cfg;
+
+ if (dir == HSI_CHAR_RX)
+ rxtx_cfg = &cl->rx_cfg;
+ else
+ rxtx_cfg = &cl->tx_cfg;
+ *cfg = *rxtx_cfg;
+}
+
+static inline void hsi_char_rx2icfg(struct hsi_config *cfg,
+ struct hsc_rx_config *rx_cfg)
+{
+ cfg->mode = rx_cfg->mode;
+ cfg->flow = rx_cfg->flow;
+ cfg->channels = rx_cfg->channels;
+ cfg->speed = 0;
+ cfg->arb_mode = 0;
+}
+
+static inline void hsi_char_tx2icfg(struct hsi_config *cfg,
+ struct hsc_tx_config *tx_cfg)
+{
+ cfg->mode = tx_cfg->mode;
+ cfg->flow = tx_cfg->flow;
+ cfg->channels = tx_cfg->channels;
+ cfg->speed = tx_cfg->speed;
+ cfg->arb_mode = tx_cfg->arb_mode;
+}
+
+static inline void hsi_char_rx2ecfg(struct hsc_rx_config *rx_cfg,
+ struct hsi_config *cfg)
+{
+ rx_cfg->mode = cfg->mode;
+ rx_cfg->flow = cfg->flow;
+ rx_cfg->channels = cfg->channels;
+}
+
+static inline void hsi_char_tx2ecfg(struct hsc_tx_config *tx_cfg,
+ struct hsi_config *cfg)
+{
+ tx_cfg->mode = cfg->mode;
+ tx_cfg->flow = cfg->flow;
+ tx_cfg->channels = cfg->channels;
+ tx_cfg->speed = cfg->speed;
+ tx_cfg->arb_mode = cfg->arb_mode;
+}
+
+static int hsi_char_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ struct hsi_char_channel *channel = file->private_data;
+ unsigned int state;
+ struct hsi_config cfg;
+ struct hsc_rx_config rx_cfg;
+ struct hsc_tx_config tx_cfg;
+ int ret = 0;
+
+ if (HSI_CHST_OC(channel) != HSI_CHST_OPENED)
+ return -EINVAL;
+
+ switch (cmd) {
+ case HSC_RESET:
+ hsi_char_reset(channel->cl);
+ break;
+ case HSC_SET_PM:
+ if (copy_from_user(&state, (void __user *)arg, sizeof(state)))
+ return -EFAULT;
+ if (state == HSC_PM_DISABLE) {
+ ret = hsi_start_tx(channel->cl);
+ if (!ret)
+ channel->wlrefcnt++;
+ } else if ((state == HSC_PM_ENABLE)
+ && (channel->wlrefcnt > 0)) {
+ ret = hsi_stop_tx(channel->cl);
+ if (!ret)
+ channel->wlrefcnt--;
+ } else {
+ ret = -EINVAL;
+ }
+ break;
+ case HSC_SEND_BREAK:
+ return hsi_char_break_send(channel->cl);
+ case HSC_SET_RX:
+ if (copy_from_user(&rx_cfg, (void __user *)arg, sizeof(rx_cfg)))
+ return -EFAULT;
+ hsi_char_rx2icfg(&cfg, &rx_cfg);
+ return hsi_char_cfg_set(channel->cl, &cfg, HSI_CHAR_RX);
+ case HSC_GET_RX:
+ hsi_char_cfg_get(channel->cl, &cfg, HSI_CHAR_RX);
+ hsi_char_rx2ecfg(&rx_cfg, &cfg);
+ if (copy_to_user((void __user *)arg, &rx_cfg, sizeof(rx_cfg)))
+ return -EFAULT;
+ break;
+ case HSC_SET_TX:
+ if (copy_from_user(&tx_cfg, (void __user *)arg, sizeof(tx_cfg)))
+ return -EFAULT;
+ hsi_char_tx2icfg(&cfg, &tx_cfg);
+ return hsi_char_cfg_set(channel->cl, &cfg, HSI_CHAR_TX);
+ case HSC_GET_TX:
+ hsi_char_cfg_get(channel->cl, &cfg, HSI_CHAR_TX);
+ hsi_char_tx2ecfg(&tx_cfg, &cfg);
+ if (copy_to_user((void __user *)arg, &tx_cfg, sizeof(tx_cfg)))
+ return -EFAULT;
+ default:
+ return -ENOIOCTLCMD;
+ }
+
+ return ret;
+}
+
+static inline struct hsi_msg *hsi_char_msg_alloc(unsigned int alloc_size)
+{
+ struct hsi_msg *msg;
+ void *buf;
+
+ msg = hsi_alloc_msg(1, GFP_KERNEL);
+ if (!msg)
+ goto out;
+ buf = kmalloc(alloc_size, GFP_KERNEL);
+ if (!buf) {
+ hsi_free_msg(msg);
+ goto out;
+ }
+ sg_init_one(msg->sgt.sgl, buf, alloc_size);
+ msg->context = buf;
+ return msg;
+out:
+ return NULL;
+}
+
+static inline void hsi_char_msg_free(struct hsi_msg *msg)
+{
+ msg->complete = NULL;
+ msg->destructor = NULL;
+ kfree(sg_virt(msg->sgt.sgl));
+ hsi_free_msg(msg);
+}
+
+static inline void hsi_char_msgs_free(struct hsi_char_channel *channel)
+{
+ struct hsi_msg *msg, *tmp;
+
+ list_for_each_entry_safe(msg, tmp, &channel->free_msgs_list, link) {
+ list_del(&msg->link);
+ hsi_char_msg_free(msg);
+ }
+ list_for_each_entry_safe(msg, tmp, &channel->rx_msgs_queue, link) {
+ list_del(&msg->link);
+ hsi_char_msg_free(msg);
+ }
+ list_for_each_entry_safe(msg, tmp, &channel->tx_msgs_queue, link) {
+ list_del(&msg->link);
+ hsi_char_msg_free(msg);
+ }
+}
+
+static inline int hsi_char_msgs_alloc(struct hsi_char_channel *channel)
+{
+ struct hsi_msg *msg;
+ int i;
+
+ for (i = 0; i < HSI_CHAR_MSGS; i++) {
+ msg = hsi_char_msg_alloc(max_data_size);
+ if (!msg)
+ goto out;
+ msg->channel = channel->ch;
+ list_add_tail(&msg->link, &channel->free_msgs_list);
+ }
+ return 0;
+out:
+ hsi_char_msgs_free(channel);
+
+ return -ENOMEM;
+}
+
+static int hsi_char_open(struct inode *inode, struct file *file)
+{
+ struct hsi_char_client_data *cl_data = &hsi_char_cl_data;
+ struct hsi_char_channel *channel = cl_data->channels + iminor(inode);
+ int ret = 0, refcnt;
+
+ if (channel->state == HSI_CHST_UNAVAIL)
+ return -ENODEV;
+
+ spin_lock_bh(&channel->lock);
+ if (HSI_CHST_OC(channel) != HSI_CHST_CLOSED) {
+ ret = -EBUSY;
+ goto out;
+ }
+ HSI_CHST_OC_SET(channel, HSI_CHST_OPENING);
+ spin_unlock_bh(&channel->lock);
+
+ refcnt = atomic_inc_return(&cl_data->refcnt);
+ if (refcnt == 1) {
+ if (cl_data->attached) {
+ atomic_dec(&cl_data->refcnt);
+ spin_lock_bh(&channel->lock);
+ HSI_CHST_OC_SET(channel, HSI_CHST_CLOSED);
+ ret = -EBUSY;
+ goto out;
+ }
+ ret = hsi_claim_port(channel->cl, 0);
+ if (ret < 0) {
+ atomic_dec(&cl_data->refcnt);
+ spin_lock_bh(&channel->lock);
+ HSI_CHST_OC_SET(channel, HSI_CHST_CLOSED);
+ goto out;
+ }
+ hsi_setup(channel->cl);
+ } else if (!cl_data->attached) {
+ atomic_dec(&cl_data->refcnt);
+ spin_lock_bh(&channel->lock);
+ HSI_CHST_OC_SET(channel, HSI_CHST_CLOSED);
+ ret = -ENODEV;
+ goto out;
+ }
+ ret = hsi_char_msgs_alloc(channel);
+
+ if (ret < 0) {
+ refcnt = atomic_dec_return(&cl_data->refcnt);
+ if (!refcnt)
+ hsi_release_port(channel->cl);
+ spin_lock_bh(&channel->lock);
+ HSI_CHST_OC_SET(channel, HSI_CHST_CLOSED);
+ goto out;
+ }
+ if (refcnt == 1)
+ cl_data->attached = 1;
+ channel->wlrefcnt = 0;
+ channel->rxpoll = HSI_CHAR_POLL_OFF;
+ channel->poll_event = (POLLOUT | POLLWRNORM);
+ file->private_data = channel;
+ spin_lock_bh(&channel->lock);
+ HSI_CHST_OC_SET(channel, HSI_CHST_OPENED);
+out:
+ spin_unlock_bh(&channel->lock);
+
+ return ret;
+}
+
+static int hsi_char_release(struct inode *inode, struct file *file)
+{
+ struct hsi_char_channel *channel = file->private_data;
+ struct hsi_char_client_data *cl_data = hsi_client_drvdata(channel->cl);
+ int ret = 0, refcnt;
+
+ spin_lock_bh(&channel->lock);
+ if (HSI_CHST_OC(channel) != HSI_CHST_OPENED)
+ goto out;
+ HSI_CHST_OC_SET(channel, HSI_CHST_CLOSING);
+ spin_unlock_bh(&channel->lock);
+
+ hsi_flush(channel->cl);
+ while (channel->wlrefcnt > 0) {
+ hsi_stop_tx(channel->cl);
+ channel->wlrefcnt--;
+ }
+
+ refcnt = atomic_dec_return(&cl_data->refcnt);
+ if (!refcnt) {
+ hsi_release_port(channel->cl);
+ cl_data->attached = 0;
+ }
+
+ hsi_char_msgs_free(channel);
+
+ spin_lock_bh(&channel->lock);
+ HSI_CHST_OC_SET(channel, HSI_CHST_CLOSED);
+ HSI_CHST_RD_SET(channel, HSI_CHST_READOFF);
+ HSI_CHST_WR_SET(channel, HSI_CHST_WRITEOFF);
+out:
+ spin_unlock_bh(&channel->lock);
+
+ return ret;
+}
+
+static const struct file_operations hsi_char_fops = {
+ .owner = THIS_MODULE,
+ .read = hsi_char_read,
+ .write = hsi_char_write,
+ .poll = hsi_char_poll,
+ .ioctl = hsi_char_ioctl,
+ .open = hsi_char_open,
+ .release = hsi_char_release,
+ .fasync = hsi_char_fasync,
+};
+
+static struct hsi_client_driver hsi_char_driver = {
+ .driver = {
+ .name = "hsi_char",
+ .owner = THIS_MODULE,
+ .probe = hsi_char_probe,
+ .remove = hsi_char_remove,
+ },
+};
+
+static inline void hsi_char_channel_init(struct hsi_char_channel *channel)
+{
+ channel->state = HSI_CHST_AVAIL;
+ INIT_LIST_HEAD(&channel->free_msgs_list);
+ init_waitqueue_head(&channel->rx_wait);
+ init_waitqueue_head(&channel->tx_wait);
+ spin_lock_init(&channel->lock);
+ INIT_LIST_HEAD(&channel->rx_msgs_queue);
+ INIT_LIST_HEAD(&channel->tx_msgs_queue);
+}
+
+static struct cdev hsi_char_cdev;
+
+static int __init hsi_char_init(void)
+{
+ char devname[] = "hsi_char";
+ struct hsi_char_client_data *cl_data = &hsi_char_cl_data;
+ struct hsi_char_channel *channel = cl_data->channels;
+ unsigned long ch_mask = 0;
+ int ret, i;
+
+ if ((max_data_size < 4) || (max_data_size > 0x10000) ||
+ (max_data_size & (max_data_size - 1))) {
+ pr_err("Invalid max read/write data size");
+ return -EINVAL;
+ }
+
+ for (i = 0; i < HSI_CHAR_DEVS && channels_map[i] >= 0; i++) {
+ if (channels_map[i] >= HSI_CHAR_DEVS) {
+ pr_err("Invalid HSI/SSI channel specified");
+ return -EINVAL;
+ }
+ set_bit(channels_map[i], &ch_mask);
+ }
+
+ if (i == 0) {
+ pr_err("No HSI channels available");
+ return -EINVAL;
+ }
+
+ memset(cl_data->channels, 0, sizeof(cl_data->channels));
+ for (i = 0; i < HSI_CHAR_DEVS; i++) {
+ channel->ch = i;
+ channel->state = HSI_CHST_UNAVAIL;
+ if (test_bit(i, &ch_mask))
+ hsi_char_channel_init(channel);
+ channel++;
+ }
+
+ ret = hsi_register_client_driver(&hsi_char_driver);
+ if (ret) {
+ pr_err("Error while registering HSI/SSI driver %d", ret);
+ return ret;
+ }
+
+ ret = alloc_chrdev_region(&hsi_char_dev, 0, HSI_CHAR_DEVS, devname);
+ if (ret < 0) {
+ hsi_unregister_client_driver(&hsi_char_driver);
+ return ret;
+ }
+
+ cdev_init(&hsi_char_cdev, &hsi_char_fops);
+ cdev_add(&hsi_char_cdev, hsi_char_dev, HSI_CHAR_DEVS);
+ pr_info("HSI/SSI char device loaded\n");
+
+ return 0;
+}
+module_init(hsi_char_init);
+
+static void __exit hsi_char_exit(void)
+{
+ cdev_del(&hsi_char_cdev);
+ unregister_chrdev_region(hsi_char_dev, HSI_CHAR_DEVS);
+ hsi_unregister_client_driver(&hsi_char_driver);
+ pr_info("HSI char device removed\n");
+}
+module_exit(hsi_char_exit);
+
+MODULE_AUTHOR("Andras Domokos <andras.domokos@nokia.com>");
+MODULE_ALIAS("hsi:hsi_char");
+MODULE_DESCRIPTION("HSI character device");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/hsi/hsi_char.h b/include/linux/hsi/hsi_char.h
new file mode 100644
index 0000000..b550362
--- /dev/null
+++ b/include/linux/hsi/hsi_char.h
@@ -0,0 +1,66 @@
+/*
+ * hsi_char.h
+ *
+ * Part of the HSI character device driver.
+ *
+ * Copyright (C) 2010 Nokia Corporation. All rights reserved.
+ *
+ * Contact: Andras Domokos <andras.domokos at nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+
+#ifndef __HSI_CHAR_H
+#define __HSI_CHAR_H
+
+#define HSI_CHAR_MAGIC 'k'
+#define HSC_IOW(num, dtype) _IOW(HSI_CHAR_MAGIC, num, dtype)
+#define HSC_IOR(num, dtype) _IOR(HSI_CHAR_MAGIC, num, dtype)
+#define HSC_IOWR(num, dtype) _IOWR(HSI_CHAR_MAGIC, num, dtype)
+#define HSC_IO(num) _IO(HSI_CHAR_MAGIC, num)
+
+#define HSC_RESET HSC_IO(16)
+#define HSC_SET_PM HSC_IO(17)
+#define HSC_SEND_BREAK HSC_IO(18)
+#define HSC_SET_RX HSC_IOW(19, struct hsc_rx_config)
+#define HSC_GET_RX HSC_IOW(20, struct hsc_rx_config)
+#define HSC_SET_TX HSC_IOW(21, struct hsc_tx_config)
+#define HSC_GET_TX HSC_IOW(22, struct hsc_tx_config)
+
+#define HSC_PM_DISABLE 0
+#define HSC_PM_ENABLE 1
+
+#define HSC_MODE_STREAM 1
+#define HSC_MODE_FRAME 2
+#define HSC_FLOW_SYNC 0
+#define HSC_ARB_RR 0
+#define HSC_ARB_PRIO 1
+
+struct hsc_rx_config {
+ uint32_t mode;
+ uint32_t flow;
+ uint32_t channels;
+};
+
+struct hsc_tx_config {
+ uint32_t mode;
+ uint32_t flow;
+ uint32_t channels;
+ uint32_t speed;
+ uint32_t arb_mode;
+};
+
+#endif /* __HSI_CHAR_H */
--
1.5.6.5
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