* Re: [PATCH 2/2] nvmem: imx-ocotp: add write support
From: Fabio Estevam @ 2017-03-27 13:42 UTC (permalink / raw)
To: Richard Leitner, Sascha Hauer, Shawn Guo
Cc: linux-kernel, Srinivas Kandagatla, Maxime Ripard,
robh+dt@kernel.org, Mark Rutland, devicetree@vger.kernel.org, dev
In-Reply-To: <1490621491-28247-2-git-send-email-richard.leitner@skidata.com>
[Adding Pengutronix folks and Shawn on Cc]
On Mon, Mar 27, 2017 at 10:31 AM, Richard Leitner
<richard.leitner@skidata.com> wrote:
> Implement write routine for OCOTP controller found in i.MX6 SoC's.
> Furthermore add locking to the read function to prevent race conditions.
> The write routine code is based on the fsl_otp driver from Freescale.
>
> Signed-off-by: Richard Leitner <richard.leitner@skidata.com>
Do we really want to have write support in the driver?
^ permalink raw reply
* [PATCH RFC v4 10/10] tty: serdev: add functions to retrieve common UART settings
From: Stefan Wahren @ 2017-03-27 13:37 UTC (permalink / raw)
To: Rob Herring, Mark Rutland, David S. Miller
Cc: Greg Kroah-Hartman, Jiri Slaby, Marcel Holtmann,
Sebastian Reichel, netdev, devicetree, linux-serial, linux-kernel,
Stefan Wahren
In-Reply-To: <1490621848-24828-1-git-send-email-stefan.wahren@i2se.com>
Currently serdev core doesn't provide functions to retrieve common
UART settings like data bits, stop bits or parity. This patch adds
the interface to the core and the necessary implementation for
serdev-ttyport.
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
---
drivers/tty/serdev/core.c | 33 ++++++++++++++++++++++++++
drivers/tty/serdev/serdev-ttyport.c | 47 +++++++++++++++++++++++++++++++++++++
include/linux/serdev.h | 22 +++++++++++++++++
3 files changed, 102 insertions(+)
diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c
index 531aa89..7b1e5bf 100644
--- a/drivers/tty/serdev/core.c
+++ b/drivers/tty/serdev/core.c
@@ -173,6 +173,39 @@ void serdev_device_set_flow_control(struct serdev_device *serdev, bool enable)
}
EXPORT_SYMBOL_GPL(serdev_device_set_flow_control);
+int serdev_device_get_data_bits(struct serdev_device *serdev)
+{
+ struct serdev_controller *ctrl = serdev->ctrl;
+
+ if (!ctrl || !ctrl->ops->get_data_bits)
+ return -EINVAL;
+
+ return ctrl->ops->get_data_bits(ctrl);
+}
+EXPORT_SYMBOL_GPL(serdev_device_get_data_bits);
+
+int serdev_device_get_parity(struct serdev_device *serdev)
+{
+ struct serdev_controller *ctrl = serdev->ctrl;
+
+ if (!ctrl || !ctrl->ops->get_parity)
+ return -EINVAL;
+
+ return ctrl->ops->get_parity(ctrl);
+}
+EXPORT_SYMBOL_GPL(serdev_device_get_parity);
+
+int serdev_device_get_stop_bits(struct serdev_device *serdev)
+{
+ struct serdev_controller *ctrl = serdev->ctrl;
+
+ if (!ctrl || !ctrl->ops->get_stop_bits)
+ return -EINVAL;
+
+ return ctrl->ops->get_stop_bits(ctrl);
+}
+EXPORT_SYMBOL_GPL(serdev_device_get_stop_bits);
+
static int serdev_drv_probe(struct device *dev)
{
const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver);
diff --git a/drivers/tty/serdev/serdev-ttyport.c b/drivers/tty/serdev/serdev-ttyport.c
index 8a30abe..5698682 100644
--- a/drivers/tty/serdev/serdev-ttyport.c
+++ b/drivers/tty/serdev/serdev-ttyport.c
@@ -167,6 +167,50 @@ static void ttyport_set_flow_control(struct serdev_controller *ctrl, bool enable
tty_set_termios(tty, &ktermios);
}
+static int ttyport_get_data_bits(struct serdev_controller *ctrl)
+{
+ struct serport *serport = serdev_controller_get_drvdata(ctrl);
+ struct tty_struct *tty = serport->tty;
+ struct ktermios ktermios = tty->termios;
+
+ switch (ktermios.c_cflag & CSIZE) {
+ case CS5:
+ return 5;
+ case CS6:
+ return 6;
+ case CS7:
+ return 7;
+ case CS8:
+ return 8;
+ }
+
+ return 0;
+}
+
+static int ttyport_get_parity(struct serdev_controller *ctrl)
+{
+ struct serport *serport = serdev_controller_get_drvdata(ctrl);
+ struct tty_struct *tty = serport->tty;
+ struct ktermios ktermios = tty->termios;
+
+ if (!(ktermios.c_cflag & PARENB))
+ return SERDEV_PARITY_NONE;
+
+ if (ktermios.c_cflag & PARODD)
+ return SERDEV_PARITY_ODD;
+
+ return SERDEV_PARITY_EVEN;
+}
+
+static int ttyport_get_stop_bits(struct serdev_controller *ctrl)
+{
+ struct serport *serport = serdev_controller_get_drvdata(ctrl);
+ struct tty_struct *tty = serport->tty;
+ struct ktermios ktermios = tty->termios;
+
+ return (ktermios.c_cflag & CSTOPB) ? 2 : 1;
+}
+
static const struct serdev_controller_ops ctrl_ops = {
.write_buf = ttyport_write_buf,
.write_flush = ttyport_write_flush,
@@ -175,6 +219,9 @@ static const struct serdev_controller_ops ctrl_ops = {
.close = ttyport_close,
.set_flow_control = ttyport_set_flow_control,
.set_baudrate = ttyport_set_baudrate,
+ .get_data_bits = ttyport_get_data_bits,
+ .get_parity = ttyport_get_parity,
+ .get_stop_bits = ttyport_get_stop_bits,
};
struct device *serdev_tty_port_register(struct tty_port *port,
diff --git a/include/linux/serdev.h b/include/linux/serdev.h
index 5176cdc..6180aa2 100644
--- a/include/linux/serdev.h
+++ b/include/linux/serdev.h
@@ -16,6 +16,10 @@
#include <linux/types.h>
#include <linux/device.h>
+#define SERDEV_PARITY_NONE 0
+#define SERDEV_PARITY_ODD 1
+#define SERDEV_PARITY_EVEN 2
+
struct serdev_controller;
struct serdev_device;
@@ -81,6 +85,9 @@ struct serdev_controller_ops {
void (*close)(struct serdev_controller *);
void (*set_flow_control)(struct serdev_controller *, bool);
unsigned int (*set_baudrate)(struct serdev_controller *, unsigned int);
+ int (*get_data_bits)(struct serdev_controller *);
+ int (*get_parity)(struct serdev_controller *);
+ int (*get_stop_bits)(struct serdev_controller *);
};
/**
@@ -189,6 +196,9 @@ void serdev_device_set_flow_control(struct serdev_device *, bool);
int serdev_device_write_buf(struct serdev_device *, const unsigned char *, size_t);
void serdev_device_write_flush(struct serdev_device *);
int serdev_device_write_room(struct serdev_device *);
+int serdev_device_get_data_bits(struct serdev_device *);
+int serdev_device_get_parity(struct serdev_device *);
+int serdev_device_get_stop_bits(struct serdev_device *);
/*
* serdev device driver functions
@@ -232,6 +242,18 @@ static inline int serdev_device_write_room(struct serdev_device *sdev)
{
return 0;
}
+static inline int serdev_device_get_data_bits(struct serdev_device *sdev)
+{
+ return -ENODEV;
+}
+static inline int serdev_device_get_parity(struct serdev_device *sdev)
+{
+ return -ENODEV;
+}
+static inline int serdev_device_get_stop_bits(struct serdev_device *sdev)
+{
+ return -ENODEV;
+}
#define serdev_device_driver_register(x)
#define serdev_device_driver_unregister(x)
--
2.1.4
^ permalink raw reply related
* [PATCH RFC v4 09/10] tty: serdev-ttyport: return actual baudrate from ttyport_set_baudrate
From: Stefan Wahren @ 2017-03-27 13:37 UTC (permalink / raw)
To: Rob Herring, Mark Rutland, David S. Miller
Cc: Greg Kroah-Hartman, Jiri Slaby, Marcel Holtmann,
Sebastian Reichel, netdev, devicetree, linux-serial, linux-kernel,
Stefan Wahren
In-Reply-To: <1490621848-24828-1-git-send-email-stefan.wahren@i2se.com>
Instead of returning the requested baudrate, we better return the
actual one because it isn't always the same.
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
---
drivers/tty/serdev/serdev-ttyport.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/tty/serdev/serdev-ttyport.c b/drivers/tty/serdev/serdev-ttyport.c
index d053935..8a30abe 100644
--- a/drivers/tty/serdev/serdev-ttyport.c
+++ b/drivers/tty/serdev/serdev-ttyport.c
@@ -150,7 +150,7 @@ static unsigned int ttyport_set_baudrate(struct serdev_controller *ctrl, unsigne
/* tty_set_termios() return not checked as it is always 0 */
tty_set_termios(tty, &ktermios);
- return speed;
+ return ktermios.c_ospeed;
}
static void ttyport_set_flow_control(struct serdev_controller *ctrl, bool enable)
--
2.1.4
^ permalink raw reply related
* [PATCH RFC v4 08/10] net: qualcomm: add QCA7000 UART driver
From: Stefan Wahren @ 2017-03-27 13:37 UTC (permalink / raw)
To: Rob Herring, Mark Rutland, David S. Miller
Cc: Greg Kroah-Hartman, Jiri Slaby, Marcel Holtmann,
Sebastian Reichel, netdev, devicetree, linux-serial, linux-kernel,
Stefan Wahren
In-Reply-To: <1490621848-24828-1-git-send-email-stefan.wahren@i2se.com>
This patch adds the Ethernet over UART driver for the
Qualcomm QCA7000 HomePlug GreenPHY.
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
---
drivers/net/ethernet/qualcomm/Kconfig | 10 +
drivers/net/ethernet/qualcomm/Makefile | 2 +
drivers/net/ethernet/qualcomm/qca_common.h | 6 +
drivers/net/ethernet/qualcomm/qca_uart.c | 419 +++++++++++++++++++++++++++++
4 files changed, 437 insertions(+)
create mode 100644 drivers/net/ethernet/qualcomm/qca_uart.c
diff --git a/drivers/net/ethernet/qualcomm/Kconfig b/drivers/net/ethernet/qualcomm/Kconfig
index b4c369d..ad6b5a4 100644
--- a/drivers/net/ethernet/qualcomm/Kconfig
+++ b/drivers/net/ethernet/qualcomm/Kconfig
@@ -30,6 +30,16 @@ config QCA7000_SPI
To compile this driver as a module, choose M here. The module
will be called qcaspi.
+config QCA7000_UART
+ tristate "Qualcomm Atheros QCA7000 UART support"
+ select QCA7000
+ depends on SERIAL_DEV_BUS && OF
+ ---help---
+ This UART protocol driver supports the Qualcomm Atheros QCA7000.
+
+ To compile this driver as a module, choose M here. The module
+ will be called qcauart.
+
config QCOM_EMAC
tristate "Qualcomm Technologies, Inc. EMAC Gigabit Ethernet support"
depends on HAS_DMA && HAS_IOMEM
diff --git a/drivers/net/ethernet/qualcomm/Makefile b/drivers/net/ethernet/qualcomm/Makefile
index 00d8729..8847db7 100644
--- a/drivers/net/ethernet/qualcomm/Makefile
+++ b/drivers/net/ethernet/qualcomm/Makefile
@@ -5,5 +5,7 @@
obj-$(CONFIG_QCA7000) += qca_common.o
obj-$(CONFIG_QCA7000_SPI) += qcaspi.o
qcaspi-objs := qca_7k.o qca_debug.o qca_spi.o
+obj-$(CONFIG_QCA7000_UART) += qcauart.o
+qcauart-objs := qca_uart.o
obj-y += emac/
diff --git a/drivers/net/ethernet/qualcomm/qca_common.h b/drivers/net/ethernet/qualcomm/qca_common.h
index 431f99d..539399e 100644
--- a/drivers/net/ethernet/qualcomm/qca_common.h
+++ b/drivers/net/ethernet/qualcomm/qca_common.h
@@ -122,6 +122,12 @@ static inline void qcafrm_fsm_init_spi(struct qcafrm_handle *handle)
handle->state = handle->init;
}
+static inline void qcafrm_fsm_init_uart(struct qcafrm_handle *handle)
+{
+ handle->init = QCAFRM_WAIT_AA1;
+ handle->state = handle->init;
+}
+
/* Gather received bytes and try to extract a full Ethernet frame
* by following a simple state machine.
*
diff --git a/drivers/net/ethernet/qualcomm/qca_uart.c b/drivers/net/ethernet/qualcomm/qca_uart.c
new file mode 100644
index 0000000..81a0353
--- /dev/null
+++ b/drivers/net/ethernet/qualcomm/qca_uart.c
@@ -0,0 +1,419 @@
+/*
+ * Copyright (c) 2011, 2012, Qualcomm Atheros Communications Inc.
+ * Copyright (c) 2017, I2SE GmbH
+ *
+ * Permission to use, copy, modify, and/or distribute this software
+ * for any purpose with or without fee is hereby granted, provided
+ * that the above copyright notice and this permission notice appear
+ * in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
+ * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
+ * THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
+ * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/* This module implements the Qualcomm Atheros UART protocol for
+ * kernel-based UART device; it is essentially an Ethernet-to-UART
+ * serial converter;
+ */
+
+#include <linux/errno.h>
+#include <linux/etherdevice.h>
+#include <linux/if_arp.h>
+#include <linux/if_ether.h>
+#include <linux/init.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_net.h>
+#include <linux/sched.h>
+#include <linux/serdev.h>
+#include <linux/skbuff.h>
+#include <linux/types.h>
+
+#include "qca_common.h"
+
+#define QCAUART_DRV_VERSION "0.1.0"
+#define QCAUART_DRV_NAME "qcauart"
+#define QCAUART_TX_TIMEOUT (1 * HZ)
+
+struct qcauart {
+ struct net_device *net_dev;
+ spinlock_t lock; /* transmit lock */
+ struct work_struct tx_work; /* Flushes transmit buffer */
+
+ struct serdev_device *serdev;
+
+ unsigned char xbuff[QCAFRM_ETHMAXMTU]; /* transmitter buffer */
+ unsigned char *xhead; /* pointer to next XMIT byte */
+ int xleft; /* bytes left in XMIT queue */
+
+ struct qcafrm_handle frm_handle;
+
+ struct sk_buff *rx_skb;
+};
+
+static int
+qca_tty_receive(struct serdev_device *serdev, const unsigned char *data,
+ size_t count)
+{
+ struct qcauart *qca = serdev_device_get_drvdata(serdev);
+ struct net_device_stats *n_stats = &qca->net_dev->stats;
+ size_t i;
+
+ if (!qca->rx_skb) {
+ qca->rx_skb = netdev_alloc_skb(qca->net_dev, qca->net_dev->mtu +
+ VLAN_ETH_HLEN);
+ if (!qca->rx_skb) {
+ n_stats->rx_errors++;
+ n_stats->rx_dropped++;
+ return 0;
+ }
+ }
+
+ for (i = 0; i < count; i++) {
+ s32 retcode;
+
+ retcode = qcafrm_fsm_decode(&qca->frm_handle,
+ qca->rx_skb->data,
+ skb_tailroom(qca->rx_skb),
+ data[i]);
+
+ switch (retcode) {
+ case QCAFRM_GATHER:
+ case QCAFRM_NOHEAD:
+ break;
+ case QCAFRM_NOTAIL:
+ netdev_dbg(qca->net_dev, "recv: no RX tail\n");
+ n_stats->rx_errors++;
+ n_stats->rx_dropped++;
+ break;
+ case QCAFRM_INVLEN:
+ netdev_dbg(qca->net_dev, "recv: invalid RX length\n");
+ n_stats->rx_errors++;
+ n_stats->rx_dropped++;
+ break;
+ default:
+ qca->rx_skb->dev = qca->net_dev;
+ n_stats->rx_packets++;
+ n_stats->rx_bytes += retcode;
+ skb_put(qca->rx_skb, retcode);
+ qca->rx_skb->protocol = eth_type_trans(
+ qca->rx_skb, qca->rx_skb->dev);
+ qca->rx_skb->ip_summed = CHECKSUM_UNNECESSARY;
+ netif_rx_ni(qca->rx_skb);
+ qca->rx_skb = netdev_alloc_skb(qca->net_dev,
+ qca->net_dev->mtu +
+ VLAN_ETH_HLEN);
+ if (!qca->rx_skb) {
+ netdev_dbg(qca->net_dev, "recv: out of RX resources\n");
+ n_stats->rx_errors++;
+ break;
+ }
+ }
+ }
+
+ return i;
+}
+
+/* Write out any remaining transmit buffer. Scheduled when tty is writable */
+static void qcauart_transmit(struct work_struct *work)
+{
+ struct qcauart *qca = container_of(work, struct qcauart, tx_work);
+ struct net_device_stats *n_stats = &qca->net_dev->stats;
+ int written;
+
+ spin_lock_bh(&qca->lock);
+
+ /* First make sure we're connected. */
+ if (!netif_running(qca->net_dev)) {
+ spin_unlock_bh(&qca->lock);
+ return;
+ }
+
+ if (qca->xleft <= 0) {
+ /* Now serial buffer is almost free & we can start
+ * transmission of another packet
+ */
+ n_stats->tx_packets++;
+ spin_unlock_bh(&qca->lock);
+ netif_wake_queue(qca->net_dev);
+ return;
+ }
+
+ written = serdev_device_write_buf(qca->serdev, qca->xhead, qca->xleft);
+ if (written > 0) {
+ qca->xleft -= written;
+ qca->xhead += written;
+ }
+ spin_unlock_bh(&qca->lock);
+}
+
+/* Called by the driver when there's room for more data.
+ * Schedule the transmit.
+ */
+static void qca_tty_wakeup(struct serdev_device *serdev)
+{
+ struct qcauart *qca = serdev_device_get_drvdata(serdev);
+
+ schedule_work(&qca->tx_work);
+}
+
+static struct serdev_device_ops qca_serdev_ops = {
+ .receive_buf = qca_tty_receive,
+ .write_wakeup = qca_tty_wakeup,
+};
+
+int
+qcauart_netdev_open(struct net_device *dev)
+{
+ struct qcauart *qca = netdev_priv(dev);
+
+ qcafrm_fsm_init_uart(&qca->frm_handle);
+ netif_start_queue(qca->net_dev);
+
+ return 0;
+}
+
+int
+qcauart_netdev_close(struct net_device *dev)
+{
+ struct qcauart *qca = netdev_priv(dev);
+
+ spin_lock_bh(&qca->lock);
+ netif_stop_queue(dev);
+ qca->xleft = 0;
+ spin_unlock_bh(&qca->lock);
+
+ return 0;
+}
+
+netdev_tx_t
+qcauart_netdev_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct net_device_stats *n_stats = &dev->stats;
+ struct qcauart *qca = netdev_priv(dev);
+ u8 pad_len = 0;
+ int written;
+ u8 *pos;
+
+ spin_lock(&qca->lock);
+
+ if (!netif_running(dev)) {
+ spin_unlock(&qca->lock);
+ netdev_warn(qca->net_dev, "xmit: iface is down\n");
+ goto out;
+ }
+
+ pos = qca->xbuff;
+
+ if (skb->len < QCAFRM_ETHMINLEN)
+ pad_len = QCAFRM_ETHMINLEN - skb->len;
+
+ pos += qcafrm_create_header(pos, skb->len + pad_len);
+
+ memcpy(pos, skb->data, skb->len);
+ pos += skb->len;
+
+ if (pad_len) {
+ memset(pos, 0, pad_len);
+ pos += pad_len;
+ }
+
+ pos += qcafrm_create_footer(pos);
+
+ netif_stop_queue(qca->net_dev);
+
+ written = serdev_device_write_buf(qca->serdev, qca->xbuff,
+ pos - qca->xbuff);
+ if (written > 0) {
+ qca->xleft = (pos - qca->xbuff) - written;
+ qca->xhead = qca->xbuff + written;
+ n_stats->tx_bytes += written;
+ }
+ spin_unlock(&qca->lock);
+
+ netif_trans_update(dev);
+out:
+ kfree_skb(skb);
+ return NETDEV_TX_OK;
+}
+
+void
+qcauart_netdev_tx_timeout(struct net_device *dev)
+{
+ struct qcauart *qca = netdev_priv(dev);
+
+ netdev_info(qca->net_dev, "Transmit timeout at %ld, latency %ld\n",
+ jiffies, dev_trans_start(dev));
+ dev->stats.tx_errors++;
+ dev->stats.tx_dropped++;
+}
+
+static int
+qcauart_netdev_init(struct net_device *dev)
+{
+ struct qcauart *qca = netdev_priv(dev);
+
+ /* Finish setting up the device info. */
+ dev->mtu = QCAFRM_ETHMAXMTU;
+ dev->type = ARPHRD_ETHER;
+
+ qca->rx_skb = netdev_alloc_skb(qca->net_dev,
+ qca->net_dev->mtu + VLAN_ETH_HLEN);
+ if (!qca->rx_skb)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static void
+qcauart_netdev_uninit(struct net_device *dev)
+{
+ struct qcauart *qca = netdev_priv(dev);
+
+ if (qca->rx_skb)
+ dev_kfree_skb(qca->rx_skb);
+}
+
+static const struct net_device_ops qcauart_netdev_ops = {
+ .ndo_init = qcauart_netdev_init,
+ .ndo_uninit = qcauart_netdev_uninit,
+ .ndo_open = qcauart_netdev_open,
+ .ndo_stop = qcauart_netdev_close,
+ .ndo_start_xmit = qcauart_netdev_xmit,
+ .ndo_set_mac_address = eth_mac_addr,
+ .ndo_tx_timeout = qcauart_netdev_tx_timeout,
+ .ndo_validate_addr = eth_validate_addr,
+};
+
+static void
+qcauart_netdev_setup(struct net_device *dev)
+{
+ struct qcauart *qca;
+
+ dev->netdev_ops = &qcauart_netdev_ops;
+ dev->watchdog_timeo = QCAUART_TX_TIMEOUT;
+ dev->priv_flags &= ~IFF_TX_SKB_SHARING;
+ dev->tx_queue_len = 100;
+
+ /* MTU range: 46 - 1500 */
+ dev->min_mtu = QCAFRM_ETHMINMTU;
+ dev->max_mtu = QCAFRM_ETHMAXMTU;
+
+ qca = netdev_priv(dev);
+ memset(qca, 0, sizeof(struct qcauart));
+}
+
+static const struct of_device_id qca_uart_of_match[] = {
+ {
+ .compatible = "qca,qca7000-uart",
+ },
+ {}
+};
+MODULE_DEVICE_TABLE(of, qca_uart_of_match);
+
+static int qca_uart_probe(struct serdev_device *serdev)
+{
+ struct net_device *qcauart_dev = alloc_etherdev(sizeof(struct qcauart));
+ struct qcauart *qca;
+ const char *mac;
+ u32 speed = 115200;
+ int ret;
+
+ if (!qcauart_dev)
+ return -ENOMEM;
+
+ qcauart_netdev_setup(qcauart_dev);
+
+ qca = netdev_priv(qcauart_dev);
+ if (!qca) {
+ pr_err("qca_uart: Fail to retrieve private structure\n");
+ ret = -ENOMEM;
+ goto free;
+ }
+ qca->net_dev = qcauart_dev;
+ qca->serdev = serdev;
+
+ spin_lock_init(&qca->lock);
+ INIT_WORK(&qca->tx_work, qcauart_transmit);
+
+ of_property_read_u32(serdev->dev.of_node, "current-speed", &speed);
+
+ mac = of_get_mac_address(serdev->dev.of_node);
+
+ if (mac)
+ ether_addr_copy(qca->net_dev->dev_addr, mac);
+
+ if (!is_valid_ether_addr(qca->net_dev->dev_addr)) {
+ eth_hw_addr_random(qca->net_dev);
+ dev_info(&serdev->dev, "Using random MAC address: %pM\n",
+ qca->net_dev->dev_addr);
+ }
+
+ netif_carrier_on(qca->net_dev);
+ serdev_device_set_drvdata(serdev, qca);
+ serdev_device_set_client_ops(serdev, &qca_serdev_ops);
+
+ ret = serdev_device_open(serdev);
+ if (ret) {
+ dev_err(&serdev->dev, "Unable to open device %s\n",
+ qcauart_dev->name);
+ goto free;
+ }
+
+ speed = serdev_device_set_baudrate(serdev, speed);
+ dev_info(&serdev->dev, "Using baudrate: %u\n", speed);
+
+ serdev_device_set_flow_control(serdev, false);
+
+ ret = register_netdev(qcauart_dev);
+ if (ret) {
+ dev_err(&serdev->dev, "Unable to register net device %s\n",
+ qcauart_dev->name);
+ goto free;
+ }
+
+ return 0;
+
+free:
+ free_netdev(qcauart_dev);
+ return ret;
+}
+
+static void qca_uart_remove(struct serdev_device *serdev)
+{
+ struct qcauart *qca = serdev_device_get_drvdata(serdev);
+
+ /* Flush any pending characters in the driver. */
+ serdev_device_close(serdev);
+
+ netif_carrier_off(qca->net_dev);
+ unregister_netdev(qca->net_dev);
+ free_netdev(qca->net_dev);
+}
+
+static struct serdev_device_driver qca_uart_driver = {
+ .probe = qca_uart_probe,
+ .remove = qca_uart_remove,
+ .driver = {
+ .name = QCAUART_DRV_NAME,
+ .of_match_table = of_match_ptr(qca_uart_of_match),
+ },
+};
+
+module_serdev_device_driver(qca_uart_driver);
+
+MODULE_DESCRIPTION("Qualcomm Atheros UART Driver");
+MODULE_AUTHOR("Qualcomm Atheros Communications");
+MODULE_AUTHOR("Stefan Wahren <stefan.wahren@i2se.com>");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_VERSION(QCAUART_DRV_VERSION);
--
2.1.4
^ permalink raw reply related
* [PATCH RFC v4 07/10] dt-bindings: net: add binding for QCA7000 UART
From: Stefan Wahren @ 2017-03-27 13:37 UTC (permalink / raw)
To: Rob Herring, Mark Rutland, David S. Miller
Cc: Greg Kroah-Hartman, Jiri Slaby, Marcel Holtmann,
Sebastian Reichel, netdev, devicetree, linux-serial, linux-kernel,
Stefan Wahren
In-Reply-To: <1490621848-24828-1-git-send-email-stefan.wahren@i2se.com>
This is the serdev binding for the QCA7000 UART driver (Ethernet over UART).
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
---
According to this binding are still some questions:
Where should be the optional hardware flow control defined (at master or slave side)?
Is it okay to have two bindings (qca-qca7000-spi and qca-qca7000-uart) or should they be merged?
.../devicetree/bindings/net/qca-qca7000-uart.txt | 31 ++++++++++++++++++++++
1 file changed, 31 insertions(+)
create mode 100644 Documentation/devicetree/bindings/net/qca-qca7000-uart.txt
diff --git a/Documentation/devicetree/bindings/net/qca-qca7000-uart.txt b/Documentation/devicetree/bindings/net/qca-qca7000-uart.txt
new file mode 100644
index 0000000..f2e0450
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/qca-qca7000-uart.txt
@@ -0,0 +1,31 @@
+* Qualcomm QCA7000 (Ethernet over UART protocol)
+
+Note: This binding applies in case the QCA7000 is configured as a
+UART slave device. It is possible to preconfigure the UART settings
+of the QCA7000 firmware, which can't be changed during runtime.
+
+Required properties:
+- compatible : Should be "qca,qca7000-uart"
+
+Optional properties:
+- local-mac-address : 6 bytes, Specifies MAC address
+- current-speed : Specifies the serial device speed in
+ bits per second (default = 115200), which is
+ predefined by the QCA7000 firmware configuration
+
+Example:
+
+/* Freescale i.MX28 UART */
+auart0: serial@8006a000 {
+ compatible = "fsl,imx28-auart", "fsl,imx23-auart";
+ reg = <0x8006a000 0x2000>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&auart0_2pins_a>;
+ status = "okay";
+
+ qca7000: ethernet {
+ compatible = "qca,qca7000-uart";
+ local-mac-address = [ A0 B0 C0 D0 E0 F0 ];
+ current-speed = <38400>;
+ };
+};
--
2.1.4
^ permalink raw reply related
* [PATCH RFC v4 06/10] net: qualcomm: make qca_common a separate kernel module
From: Stefan Wahren @ 2017-03-27 13:37 UTC (permalink / raw)
To: Rob Herring, Mark Rutland, David S. Miller
Cc: Greg Kroah-Hartman, Jiri Slaby, Marcel Holtmann,
Sebastian Reichel, netdev-u79uwXL29TY76Z2rM5mHXA,
devicetree-u79uwXL29TY76Z2rM5mHXA,
linux-serial-u79uwXL29TY76Z2rM5mHXA,
linux-kernel-u79uwXL29TY76Z2rM5mHXA, Stefan Wahren
In-Reply-To: <1490621848-24828-1-git-send-email-stefan.wahren-eS4NqCHxEME@public.gmane.org>
In order to share common functions between QCA7000 SPI and UART protocol
driver the qca_common needs to be a separate kernel module.
Signed-off-by: Stefan Wahren <stefan.wahren-eS4NqCHxEME@public.gmane.org>
---
drivers/net/ethernet/qualcomm/Kconfig | 8 +++++++-
drivers/net/ethernet/qualcomm/Makefile | 5 +++--
drivers/net/ethernet/qualcomm/qca_common.c | 10 ++++++++++
3 files changed, 20 insertions(+), 3 deletions(-)
diff --git a/drivers/net/ethernet/qualcomm/Kconfig b/drivers/net/ethernet/qualcomm/Kconfig
index d7720bf..b4c369d 100644
--- a/drivers/net/ethernet/qualcomm/Kconfig
+++ b/drivers/net/ethernet/qualcomm/Kconfig
@@ -16,7 +16,13 @@ config NET_VENDOR_QUALCOMM
if NET_VENDOR_QUALCOMM
config QCA7000
- tristate "Qualcomm Atheros QCA7000 support"
+ tristate
+ help
+ This enables support for the Qualcomm Atheros QCA7000.
+
+config QCA7000_SPI
+ tristate "Qualcomm Atheros QCA7000 SPI support"
+ select QCA7000
depends on SPI_MASTER && OF
---help---
This SPI protocol driver supports the Qualcomm Atheros QCA7000.
diff --git a/drivers/net/ethernet/qualcomm/Makefile b/drivers/net/ethernet/qualcomm/Makefile
index 8080570..00d8729 100644
--- a/drivers/net/ethernet/qualcomm/Makefile
+++ b/drivers/net/ethernet/qualcomm/Makefile
@@ -2,7 +2,8 @@
# Makefile for the Qualcomm network device drivers.
#
-obj-$(CONFIG_QCA7000) += qcaspi.o
-qcaspi-objs := qca_spi.o qca_common.o qca_7k.o qca_debug.o
+obj-$(CONFIG_QCA7000) += qca_common.o
+obj-$(CONFIG_QCA7000_SPI) += qcaspi.o
+qcaspi-objs := qca_7k.o qca_debug.o qca_spi.o
obj-y += emac/
diff --git a/drivers/net/ethernet/qualcomm/qca_common.c b/drivers/net/ethernet/qualcomm/qca_common.c
index d930524..f2c9e76 100644
--- a/drivers/net/ethernet/qualcomm/qca_common.c
+++ b/drivers/net/ethernet/qualcomm/qca_common.c
@@ -21,7 +21,9 @@
* by an atheros frame while transmitted over a serial channel;
*/
+#include <linux/init.h>
#include <linux/kernel.h>
+#include <linux/module.h>
#include "qca_common.h"
@@ -46,6 +48,7 @@ qcafrm_create_header(u8 *buf, u16 length)
return QCAFRM_HEADER_LEN;
}
+EXPORT_SYMBOL_GPL(qcafrm_create_header);
u16
qcafrm_create_footer(u8 *buf)
@@ -57,6 +60,7 @@ qcafrm_create_footer(u8 *buf)
buf[1] = 0x55;
return QCAFRM_FOOTER_LEN;
}
+EXPORT_SYMBOL_GPL(qcafrm_create_footer);
/* Gather received bytes and try to extract a full ethernet frame by
* following a simple state machine.
@@ -154,3 +158,9 @@ qcafrm_fsm_decode(struct qcafrm_handle *handle, u8 *buf, u16 buf_len, u8 recv_by
return ret;
}
+EXPORT_SYMBOL_GPL(qcafrm_fsm_decode);
+
+MODULE_DESCRIPTION("Qualcomm Atheros Common");
+MODULE_AUTHOR("Qualcomm Atheros Communications");
+MODULE_AUTHOR("Stefan Wahren <stefan.wahren-eS4NqCHxEME@public.gmane.org>");
+MODULE_LICENSE("Dual BSD/GPL");
--
2.1.4
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
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^ permalink raw reply related
* [PATCH RFC v4 05/10] net: qualcomm: prepare frame decoding for UART driver
From: Stefan Wahren @ 2017-03-27 13:37 UTC (permalink / raw)
To: Rob Herring, Mark Rutland, David S. Miller
Cc: Greg Kroah-Hartman, Jiri Slaby, Marcel Holtmann,
Sebastian Reichel, netdev-u79uwXL29TY76Z2rM5mHXA,
devicetree-u79uwXL29TY76Z2rM5mHXA,
linux-serial-u79uwXL29TY76Z2rM5mHXA,
linux-kernel-u79uwXL29TY76Z2rM5mHXA, Stefan Wahren
In-Reply-To: <1490621848-24828-1-git-send-email-stefan.wahren-eS4NqCHxEME@public.gmane.org>
Unfortunately the frame format is not exactly identical between SPI
and UART. In case of SPI there is an additional HW length at the
beginning. So store the initial state to make the decoding state machine
more flexible and easy to extend for UART support.
Signed-off-by: Stefan Wahren <stefan.wahren-eS4NqCHxEME@public.gmane.org>
---
drivers/net/ethernet/qualcomm/qca_common.c | 12 ++++++------
drivers/net/ethernet/qualcomm/qca_common.h | 8 ++++++--
drivers/net/ethernet/qualcomm/qca_spi.c | 2 +-
3 files changed, 13 insertions(+), 9 deletions(-)
diff --git a/drivers/net/ethernet/qualcomm/qca_common.c b/drivers/net/ethernet/qualcomm/qca_common.c
index 26453a9..d930524 100644
--- a/drivers/net/ethernet/qualcomm/qca_common.c
+++ b/drivers/net/ethernet/qualcomm/qca_common.c
@@ -83,7 +83,7 @@ qcafrm_fsm_decode(struct qcafrm_handle *handle, u8 *buf, u16 buf_len, u8 recv_by
if (recv_byte != 0x00) {
/* first two bytes of length must be 0 */
- handle->state = QCAFRM_HW_LEN0;
+ handle->state = handle->init;
}
break;
case QCAFRM_HW_LEN2:
@@ -97,7 +97,7 @@ qcafrm_fsm_decode(struct qcafrm_handle *handle, u8 *buf, u16 buf_len, u8 recv_by
case QCAFRM_WAIT_AA4:
if (recv_byte != 0xAA) {
ret = QCAFRM_NOHEAD;
- handle->state = QCAFRM_HW_LEN0;
+ handle->state = handle->init;
} else {
handle->state--;
}
@@ -119,7 +119,7 @@ qcafrm_fsm_decode(struct qcafrm_handle *handle, u8 *buf, u16 buf_len, u8 recv_by
len = handle->offset;
if (len > buf_len || len < QCAFRM_ETHMINLEN) {
ret = QCAFRM_INVLEN;
- handle->state = QCAFRM_HW_LEN0;
+ handle->state = handle->init;
} else {
handle->state = (enum qcafrm_state)(len + 1);
/* Remaining number of bytes. */
@@ -135,7 +135,7 @@ qcafrm_fsm_decode(struct qcafrm_handle *handle, u8 *buf, u16 buf_len, u8 recv_by
case QCAFRM_WAIT_551:
if (recv_byte != 0x55) {
ret = QCAFRM_NOTAIL;
- handle->state = QCAFRM_HW_LEN0;
+ handle->state = handle->init;
} else {
handle->state = QCAFRM_WAIT_552;
}
@@ -143,11 +143,11 @@ qcafrm_fsm_decode(struct qcafrm_handle *handle, u8 *buf, u16 buf_len, u8 recv_by
case QCAFRM_WAIT_552:
if (recv_byte != 0x55) {
ret = QCAFRM_NOTAIL;
- handle->state = QCAFRM_HW_LEN0;
+ handle->state = handle->init;
} else {
ret = handle->offset;
/* Frame is fully received. */
- handle->state = QCAFRM_HW_LEN0;
+ handle->state = handle->init;
}
break;
}
diff --git a/drivers/net/ethernet/qualcomm/qca_common.h b/drivers/net/ethernet/qualcomm/qca_common.h
index d5e795d..431f99d 100644
--- a/drivers/net/ethernet/qualcomm/qca_common.h
+++ b/drivers/net/ethernet/qualcomm/qca_common.h
@@ -61,6 +61,7 @@
#define QCAFRM_ERR_BASE -1000
enum qcafrm_state {
+ /* HW length is only available on SPI */
QCAFRM_HW_LEN0 = 0x8000,
QCAFRM_HW_LEN1 = QCAFRM_HW_LEN0 - 1,
QCAFRM_HW_LEN2 = QCAFRM_HW_LEN1 - 1,
@@ -101,6 +102,8 @@ enum qcafrm_state {
struct qcafrm_handle {
/* Current decoding state */
enum qcafrm_state state;
+ /* Initial state depends on connection type */
+ enum qcafrm_state init;
/* Offset in buffer (borrowed for length too) */
s16 offset;
@@ -113,9 +116,10 @@ u16 qcafrm_create_header(u8 *buf, u16 len);
u16 qcafrm_create_footer(u8 *buf);
-static inline void qcafrm_fsm_init(struct qcafrm_handle *handle)
+static inline void qcafrm_fsm_init_spi(struct qcafrm_handle *handle)
{
- handle->state = QCAFRM_HW_LEN0;
+ handle->init = QCAFRM_HW_LEN0;
+ handle->state = handle->init;
}
/* Gather received bytes and try to extract a full Ethernet frame
diff --git a/drivers/net/ethernet/qualcomm/qca_spi.c b/drivers/net/ethernet/qualcomm/qca_spi.c
index 65adc10..3617bde 100644
--- a/drivers/net/ethernet/qualcomm/qca_spi.c
+++ b/drivers/net/ethernet/qualcomm/qca_spi.c
@@ -638,7 +638,7 @@ qcaspi_netdev_open(struct net_device *dev)
qca->intr_req = 1;
qca->intr_svc = 0;
qca->sync = QCASPI_SYNC_UNKNOWN;
- qcafrm_fsm_init(&qca->frm_handle);
+ qcafrm_fsm_init_spi(&qca->frm_handle);
qca->spi_thread = kthread_run((void *)qcaspi_spi_thread,
qca, "%s", dev->name);
--
2.1.4
--
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^ permalink raw reply related
* [PATCH RFC v4 04/10] net: qualcomm: rename qca_framing.c to qca_common.c
From: Stefan Wahren @ 2017-03-27 13:37 UTC (permalink / raw)
To: Rob Herring, Mark Rutland, David S. Miller
Cc: Greg Kroah-Hartman, Jiri Slaby, Marcel Holtmann,
Sebastian Reichel, netdev, devicetree, linux-serial, linux-kernel,
Stefan Wahren
In-Reply-To: <1490621848-24828-1-git-send-email-stefan.wahren@i2se.com>
As preparation for the upcoming UART driver we need a module
which contains common functions for both interfaces. The module
qca_framing is a good candidate but renaming to qca_common would
make it clear.
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
---
drivers/net/ethernet/qualcomm/Makefile | 2 +-
drivers/net/ethernet/qualcomm/{qca_framing.c => qca_common.c} | 2 +-
drivers/net/ethernet/qualcomm/{qca_framing.h => qca_common.h} | 0
drivers/net/ethernet/qualcomm/qca_spi.c | 2 +-
drivers/net/ethernet/qualcomm/qca_spi.h | 2 +-
5 files changed, 4 insertions(+), 4 deletions(-)
rename drivers/net/ethernet/qualcomm/{qca_framing.c => qca_common.c} (99%)
rename drivers/net/ethernet/qualcomm/{qca_framing.h => qca_common.h} (100%)
diff --git a/drivers/net/ethernet/qualcomm/Makefile b/drivers/net/ethernet/qualcomm/Makefile
index aacb0a5..8080570 100644
--- a/drivers/net/ethernet/qualcomm/Makefile
+++ b/drivers/net/ethernet/qualcomm/Makefile
@@ -3,6 +3,6 @@
#
obj-$(CONFIG_QCA7000) += qcaspi.o
-qcaspi-objs := qca_spi.o qca_framing.o qca_7k.o qca_debug.o
+qcaspi-objs := qca_spi.o qca_common.o qca_7k.o qca_debug.o
obj-y += emac/
diff --git a/drivers/net/ethernet/qualcomm/qca_framing.c b/drivers/net/ethernet/qualcomm/qca_common.c
similarity index 99%
rename from drivers/net/ethernet/qualcomm/qca_framing.c
rename to drivers/net/ethernet/qualcomm/qca_common.c
index faa924c..26453a9 100644
--- a/drivers/net/ethernet/qualcomm/qca_framing.c
+++ b/drivers/net/ethernet/qualcomm/qca_common.c
@@ -23,7 +23,7 @@
#include <linux/kernel.h>
-#include "qca_framing.h"
+#include "qca_common.h"
u16
qcafrm_create_header(u8 *buf, u16 length)
diff --git a/drivers/net/ethernet/qualcomm/qca_framing.h b/drivers/net/ethernet/qualcomm/qca_common.h
similarity index 100%
rename from drivers/net/ethernet/qualcomm/qca_framing.h
rename to drivers/net/ethernet/qualcomm/qca_common.h
diff --git a/drivers/net/ethernet/qualcomm/qca_spi.c b/drivers/net/ethernet/qualcomm/qca_spi.c
index 4f431bc..65adc10 100644
--- a/drivers/net/ethernet/qualcomm/qca_spi.c
+++ b/drivers/net/ethernet/qualcomm/qca_spi.c
@@ -43,8 +43,8 @@
#include <linux/types.h>
#include "qca_7k.h"
+#include "qca_common.h"
#include "qca_debug.h"
-#include "qca_framing.h"
#include "qca_spi.h"
#define MAX_DMA_BURST_LEN 5000
diff --git a/drivers/net/ethernet/qualcomm/qca_spi.h b/drivers/net/ethernet/qualcomm/qca_spi.h
index 064853d..cce4802 100644
--- a/drivers/net/ethernet/qualcomm/qca_spi.h
+++ b/drivers/net/ethernet/qualcomm/qca_spi.h
@@ -32,7 +32,7 @@
#include <linux/spi/spi.h>
#include <linux/types.h>
-#include "qca_framing.h"
+#include "qca_common.h"
#define QCASPI_DRV_VERSION "0.2.7-i"
#define QCASPI_DRV_NAME "qcaspi"
--
2.1.4
^ permalink raw reply related
* [PATCH RFC v4 03/10] net: qualcomm: move qcaspi_tx_cmd to qca_spi.c
From: Stefan Wahren @ 2017-03-27 13:37 UTC (permalink / raw)
To: Rob Herring, Mark Rutland, David S. Miller
Cc: Greg Kroah-Hartman, Jiri Slaby, Marcel Holtmann,
Sebastian Reichel, netdev, devicetree, linux-serial, linux-kernel,
Stefan Wahren
In-Reply-To: <1490621848-24828-1-git-send-email-stefan.wahren@i2se.com>
The function qcaspi_tx_cmd() is only called from qca_spi.c. So we better
move it there.
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
---
drivers/net/ethernet/qualcomm/qca_7k.c | 24 ------------------------
drivers/net/ethernet/qualcomm/qca_7k.h | 1 -
drivers/net/ethernet/qualcomm/qca_spi.c | 24 ++++++++++++++++++++++++
3 files changed, 24 insertions(+), 25 deletions(-)
diff --git a/drivers/net/ethernet/qualcomm/qca_7k.c b/drivers/net/ethernet/qualcomm/qca_7k.c
index 557d53c..aa90a1d 100644
--- a/drivers/net/ethernet/qualcomm/qca_7k.c
+++ b/drivers/net/ethernet/qualcomm/qca_7k.c
@@ -119,27 +119,3 @@ qcaspi_write_register(struct qcaspi *qca, u16 reg, u16 value)
return ret;
}
-
-int
-qcaspi_tx_cmd(struct qcaspi *qca, u16 cmd)
-{
- __be16 tx_data;
- struct spi_message *msg = &qca->spi_msg1;
- struct spi_transfer *transfer = &qca->spi_xfer1;
- int ret;
-
- tx_data = cpu_to_be16(cmd);
- transfer->len = sizeof(tx_data);
- transfer->tx_buf = &tx_data;
- transfer->rx_buf = NULL;
-
- ret = spi_sync(qca->spi_dev, msg);
-
- if (!ret)
- ret = msg->status;
-
- if (ret)
- qcaspi_spi_error(qca);
-
- return ret;
-}
diff --git a/drivers/net/ethernet/qualcomm/qca_7k.h b/drivers/net/ethernet/qualcomm/qca_7k.h
index 1cad851..b390b1f 100644
--- a/drivers/net/ethernet/qualcomm/qca_7k.h
+++ b/drivers/net/ethernet/qualcomm/qca_7k.h
@@ -67,6 +67,5 @@
void qcaspi_spi_error(struct qcaspi *qca);
int qcaspi_read_register(struct qcaspi *qca, u16 reg, u16 *result);
int qcaspi_write_register(struct qcaspi *qca, u16 reg, u16 value);
-int qcaspi_tx_cmd(struct qcaspi *qca, u16 cmd);
#endif /* _QCA_7K_H */
diff --git a/drivers/net/ethernet/qualcomm/qca_spi.c b/drivers/net/ethernet/qualcomm/qca_spi.c
index 513e6c7..4f431bc 100644
--- a/drivers/net/ethernet/qualcomm/qca_spi.c
+++ b/drivers/net/ethernet/qualcomm/qca_spi.c
@@ -193,6 +193,30 @@ qcaspi_read_legacy(struct qcaspi *qca, u8 *dst, u32 len)
}
static int
+qcaspi_tx_cmd(struct qcaspi *qca, u16 cmd)
+{
+ __be16 tx_data;
+ struct spi_message *msg = &qca->spi_msg1;
+ struct spi_transfer *transfer = &qca->spi_xfer1;
+ int ret;
+
+ tx_data = cpu_to_be16(cmd);
+ transfer->len = sizeof(tx_data);
+ transfer->tx_buf = &tx_data;
+ transfer->rx_buf = NULL;
+
+ ret = spi_sync(qca->spi_dev, msg);
+
+ if (!ret)
+ ret = msg->status;
+
+ if (ret)
+ qcaspi_spi_error(qca);
+
+ return ret;
+}
+
+static int
qcaspi_tx_frame(struct qcaspi *qca, struct sk_buff *skb)
{
u32 count;
--
2.1.4
^ permalink raw reply related
* [PATCH RFC v4 02/10] net: qca_debug: use net_device_ops instead of direct call
From: Stefan Wahren @ 2017-03-27 13:37 UTC (permalink / raw)
To: Rob Herring, Mark Rutland, David S. Miller
Cc: Greg Kroah-Hartman, Jiri Slaby, Marcel Holtmann,
Sebastian Reichel, netdev, devicetree, linux-serial, linux-kernel,
Stefan Wahren
In-Reply-To: <1490621848-24828-1-git-send-email-stefan.wahren@i2se.com>
There is no need to export qcaspi_netdev_open and qcaspi_netdev_close
because they are also accessible via the net_device_ops.
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
---
drivers/net/ethernet/qualcomm/qca_debug.c | 5 +++--
drivers/net/ethernet/qualcomm/qca_spi.h | 3 ---
2 files changed, 3 insertions(+), 5 deletions(-)
diff --git a/drivers/net/ethernet/qualcomm/qca_debug.c b/drivers/net/ethernet/qualcomm/qca_debug.c
index d145df9..92b6be9 100644
--- a/drivers/net/ethernet/qualcomm/qca_debug.c
+++ b/drivers/net/ethernet/qualcomm/qca_debug.c
@@ -275,6 +275,7 @@ qcaspi_get_ringparam(struct net_device *dev, struct ethtool_ringparam *ring)
static int
qcaspi_set_ringparam(struct net_device *dev, struct ethtool_ringparam *ring)
{
+ const struct net_device_ops *ops = dev->netdev_ops;
struct qcaspi *qca = netdev_priv(dev);
if ((ring->rx_pending) ||
@@ -283,13 +284,13 @@ qcaspi_set_ringparam(struct net_device *dev, struct ethtool_ringparam *ring)
return -EINVAL;
if (netif_running(dev))
- qcaspi_netdev_close(dev);
+ ops->ndo_stop(dev);
qca->txr.count = max_t(u32, ring->tx_pending, TX_RING_MIN_LEN);
qca->txr.count = min_t(u16, qca->txr.count, TX_RING_MAX_LEN);
if (netif_running(dev))
- qcaspi_netdev_open(dev);
+ ops->ndo_open(dev);
return 0;
}
diff --git a/drivers/net/ethernet/qualcomm/qca_spi.h b/drivers/net/ethernet/qualcomm/qca_spi.h
index 6e31a0e..064853d 100644
--- a/drivers/net/ethernet/qualcomm/qca_spi.h
+++ b/drivers/net/ethernet/qualcomm/qca_spi.h
@@ -108,7 +108,4 @@ struct qcaspi {
u16 burst_len;
};
-int qcaspi_netdev_open(struct net_device *dev);
-int qcaspi_netdev_close(struct net_device *dev);
-
#endif /* _QCA_SPI_H */
--
2.1.4
^ permalink raw reply related
* [PATCH RFC v4 01/10] net: qualcomm: remove unnecessary includes
From: Stefan Wahren @ 2017-03-27 13:37 UTC (permalink / raw)
To: Rob Herring, Mark Rutland, David S. Miller
Cc: Greg Kroah-Hartman, Jiri Slaby, Marcel Holtmann,
Sebastian Reichel, netdev-u79uwXL29TY76Z2rM5mHXA,
devicetree-u79uwXL29TY76Z2rM5mHXA,
linux-serial-u79uwXL29TY76Z2rM5mHXA,
linux-kernel-u79uwXL29TY76Z2rM5mHXA, Stefan Wahren
In-Reply-To: <1490621848-24828-1-git-send-email-stefan.wahren-eS4NqCHxEME@public.gmane.org>
Most of the includes in qca_7k.c are unnecessary so we better remove them.
Signed-off-by: Stefan Wahren <stefan.wahren-eS4NqCHxEME@public.gmane.org>
---
drivers/net/ethernet/qualcomm/qca_7k.c | 4 ----
1 file changed, 4 deletions(-)
diff --git a/drivers/net/ethernet/qualcomm/qca_7k.c b/drivers/net/ethernet/qualcomm/qca_7k.c
index f0066fb..557d53c 100644
--- a/drivers/net/ethernet/qualcomm/qca_7k.c
+++ b/drivers/net/ethernet/qualcomm/qca_7k.c
@@ -23,11 +23,7 @@
* kernel-based SPI device.
*/
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
#include <linux/spi/spi.h>
-#include <linux/version.h>
#include "qca_7k.h"
--
2.1.4
--
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^ permalink raw reply related
* [PATCH RFC v4 00/10] net: qualcomm: add QCA7000 UART driver
From: Stefan Wahren @ 2017-03-27 13:37 UTC (permalink / raw)
To: Rob Herring, Mark Rutland, David S. Miller
Cc: Greg Kroah-Hartman, Jiri Slaby, Marcel Holtmann,
Sebastian Reichel, netdev, devicetree, linux-serial, linux-kernel,
Stefan Wahren
The Qualcomm QCA7000 HomePlug GreenPHY supports two interfaces:
UART and SPI. This patch series adds the missing support for UART.
This driver based on the Qualcomm code [1], but contains some changes:
* use random MAC address per default
* use net_device_stats from device
* share frame decoding between SPI and UART driver
* improve error handling
* reimplement tty_wakeup with work queue (based on slcan)
* use new serial device bus instead of ldisc
The patches 1 - 3 are just for clean up and are not related to
the UART support. Patches 4 - 7 prepare the existing QCA7000
code for UART support. Patch 8 contains the new driver. The last
two patches are suggested improvements for serial device bus.
The code itself has been tested on a Freescale i.MX28 board and
a Raspberry Pi Zero.
Changes in v4:
* rebase to current linux-next
* use parameter -M for git format-patch
* change order of local variables where possible
* implement basic serdev support (without hardware flow control)
Changes in v3:
* rebase to current net-next
Changes in v2:
* fix build issue by using netif_trans_update() and dev_trans_start()
[1] - https://github.com/IoE/qca7000
Stefan Wahren (10):
net: qualcomm: remove unnecessary includes
net: qca_debug: use net_device_ops instead of direct call
net: qualcomm: move qcaspi_tx_cmd to qca_spi.c
net: qualcomm: rename qca_framing.c to qca_common.c
net: qualcomm: prepare frame decoding for UART driver
net: qualcomm: make qca_common a separate kernel module
dt-bindings: net: add binding for QCA7000 UART
net: qualcomm: add QCA7000 UART driver
tty: serdev-ttyport: return actual baudrate from ttyport_set_baudrate
tty: serdev: add functions to retrieve common UART settings
.../devicetree/bindings/net/qca-qca7000-uart.txt | 31 ++
drivers/net/ethernet/qualcomm/Kconfig | 18 +-
drivers/net/ethernet/qualcomm/Makefile | 7 +-
drivers/net/ethernet/qualcomm/qca_7k.c | 28 --
drivers/net/ethernet/qualcomm/qca_7k.h | 1 -
.../qualcomm/{qca_framing.c => qca_common.c} | 24 +-
.../qualcomm/{qca_framing.h => qca_common.h} | 14 +-
drivers/net/ethernet/qualcomm/qca_debug.c | 5 +-
drivers/net/ethernet/qualcomm/qca_spi.c | 28 +-
drivers/net/ethernet/qualcomm/qca_spi.h | 5 +-
drivers/net/ethernet/qualcomm/qca_uart.c | 419 +++++++++++++++++++++
drivers/tty/serdev/core.c | 33 ++
drivers/tty/serdev/serdev-ttyport.c | 49 ++-
include/linux/serdev.h | 22 ++
14 files changed, 634 insertions(+), 50 deletions(-)
create mode 100644 Documentation/devicetree/bindings/net/qca-qca7000-uart.txt
rename drivers/net/ethernet/qualcomm/{qca_framing.c => qca_common.c} (86%)
rename drivers/net/ethernet/qualcomm/{qca_framing.h => qca_common.h} (90%)
create mode 100644 drivers/net/ethernet/qualcomm/qca_uart.c
--
2.1.4
^ permalink raw reply
* Re: [PATCH v1.1 3/3] device property: fwnode_property_read_string_array() returns nr of strings
From: Mika Westerberg @ 2017-03-27 13:36 UTC (permalink / raw)
To: Sakari Ailus
Cc: linux-acpi, devicetree, sudeep.holla, lorenzo.pieralisi, rafael,
mark.rutland, broonie, robh, ahs3
In-Reply-To: <1489584688-15624-1-git-send-email-sakari.ailus@linux.intel.com>
On Wed, Mar 15, 2017 at 03:31:28PM +0200, Sakari Ailus wrote:
> Functionally fwnode_property_read_string_array() should match
> of_property_read_string_array() and work as a drop-in substitute for the
> latter. of_property_read_string_array() returns the number of strings read
> if the target string pointer array is non-NULL. Make
> fwnode_property_read_string_array() do the same.
>
> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> ---
> This patch replaces v1 3/3 patch in this set.
>
> Instead of changing the return value of fwnode / device property API
> string array access on OF, change the behaviour on pset and ACPI instead.
> This makes them to return the number of strings read on success.
>
> I can merge this with patch 2/3 which is changing the same part of the
> file, however I'm sending this separately at least for now as I think it's
> easier to review this way, rather than making a bugfix and a change of the
> behaviour in the same patch.
>
> Regards,
> Sakari
>
> drivers/base/property.c | 64 +++++++++++++++++++++++++++++++++++--------------
> 1 file changed, 46 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/base/property.c b/drivers/base/property.c
> index 8c98390..82187ac 100644
> --- a/drivers/base/property.c
> +++ b/drivers/base/property.c
> @@ -340,8 +340,8 @@ EXPORT_SYMBOL_GPL(device_property_read_u64_array);
> * Function reads an array of string properties with @propname from the device
> * firmware description and stores them to @val if found.
> *
> - * Return: number of values if @val was %NULL,
> - * %0 if the property was found (success),
> + * Return: number of values read on success if @val is non-NULL,
> + * number of values available on success if @val is NULL,
> * %-EINVAL if given arguments are not valid,
> * %-ENODATA if the property does not have a value,
> * %-EPROTO or %-EILSEQ if the property is not an array of strings,
> @@ -549,29 +549,57 @@ static int __fwnode_property_read_string_array(struct fwnode_handle *fwnode,
> of_property_read_string_array(to_of_node(fwnode),
> propname, val, nval) :
> of_property_count_strings(to_of_node(fwnode), propname);
> - else if (is_acpi_node(fwnode))
> - return acpi_node_prop_read(fwnode, propname, DEV_PROP_STRING,
> - val, nval);
> - else if (is_pset_node(fwnode)) {
> + else if (is_acpi_node(fwnode)) {
> + int array_len =
> + acpi_node_prop_read(fwnode, propname, DEV_PROP_STRING,
Why not change acpi_node_prop_read() instead? This way you don't need to
add the extra code dealing with the return value here.
Ditto for the pset counterpart.
^ permalink raw reply
* [PATCH 2/2] nvmem: imx-ocotp: add write support
From: Richard Leitner @ 2017-03-27 13:31 UTC (permalink / raw)
To: linux-kernel-u79uwXL29TY76Z2rM5mHXA,
srinivas.kandagatla-QSEj5FYQhm4dnm+yROfE0A,
maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8
Cc: robh+dt-DgEjT+Ai2ygdnm+yROfE0A, mark.rutland-5wv7dgnIgG8,
devicetree-u79uwXL29TY76Z2rM5mHXA, dev-M/VWbR8SM2SsTnJN9+BGXg,
Richard Leitner
In-Reply-To: <1490621491-28247-1-git-send-email-richard.leitner-WcANXNA0UjBBDgjK7y7TUQ@public.gmane.org>
Implement write routine for OCOTP controller found in i.MX6 SoC's.
Furthermore add locking to the read function to prevent race conditions.
The write routine code is based on the fsl_otp driver from Freescale.
Signed-off-by: Richard Leitner <richard.leitner-WcANXNA0UjBBDgjK7y7TUQ@public.gmane.org>
---
.../devicetree/bindings/nvmem/imx-ocotp.txt | 4 +
drivers/nvmem/imx-ocotp.c | 210 ++++++++++++++++++++-
2 files changed, 212 insertions(+), 2 deletions(-)
diff --git a/Documentation/devicetree/bindings/nvmem/imx-ocotp.txt b/Documentation/devicetree/bindings/nvmem/imx-ocotp.txt
index 966a72e..4b04356 100644
--- a/Documentation/devicetree/bindings/nvmem/imx-ocotp.txt
+++ b/Documentation/devicetree/bindings/nvmem/imx-ocotp.txt
@@ -13,10 +13,14 @@ Required properties:
- reg: Should contain the register base and length.
- clocks: Should contain a phandle pointing to the gated peripheral clock.
+Optional properties:
+- read-only: disable write access
+
Example:
ocotp: ocotp@021bc000 {
compatible = "fsl,imx6q-ocotp", "syscon";
reg = <0x021bc000 0x4000>;
clocks = <&clks IMX6QDL_CLK_IIM>;
+ read-only;
};
diff --git a/drivers/nvmem/imx-ocotp.c b/drivers/nvmem/imx-ocotp.c
index e2b62b3..eb55b41 100644
--- a/drivers/nvmem/imx-ocotp.c
+++ b/drivers/nvmem/imx-ocotp.c
@@ -7,6 +7,9 @@
* Copyright (c) 2010 Baruch Siach <baruch-NswTu9S1W3P6gbPvEgmw2w@public.gmane.org>,
* Orex Computed Radiography
*
+ * Write support based on the fsl_otp driver,
+ * Copyright (C) 2010-2013 Freescale Semiconductor, Inc
+ *
* 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.
@@ -24,6 +27,7 @@
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
+#include <linux/delay.h>
#define IMX_OCOTP_OFFSET_B0W0 0x400 /* Offset from base address of the
* OTP Bank0 Word0
@@ -31,20 +35,69 @@
#define IMX_OCOTP_OFFSET_PER_WORD 0x10 /* Offset between the start addr
* of two consecutive OTP words.
*/
+
#define IMX_OCOTP_ADDR_CTRL 0x0000
+#define IMX_OCOTP_ADDR_CTRL_SET 0x0004
#define IMX_OCOTP_ADDR_CTRL_CLR 0x0008
+#define IMX_OCOTP_ADDR_TIMING 0x0010
+#define IMX_OCOTP_ADDR_DATA 0x0020
+#define IMX_OCOTP_BM_CTRL_ADDR 0x0000007F
+#define IMX_OCOTP_BM_CTRL_BUSY 0x00000100
#define IMX_OCOTP_BM_CTRL_ERROR 0x00000200
+#define IMX_OCOTP_BM_CTRL_REL_SHADOWS 0x00000400
+#define DEF_RELAX 20 /* > 16.5ns */
+#define IMX_OCOTP_WR_UNLOCK 0x3E770000
#define IMX_OCOTP_READ_LOCKED_VAL 0xBADABADA
+static DEFINE_MUTEX(ocotp_mutex);
+
struct ocotp_priv {
struct device *dev;
struct clk *clk;
void __iomem *base;
unsigned int nregs;
+ struct nvmem_config *config;
};
+static int imx_ocotp_wait_for_busy(void __iomem *base, u32 flags)
+{
+ int count;
+ u32 c, mask;
+
+ mask = IMX_OCOTP_BM_CTRL_BUSY | IMX_OCOTP_BM_CTRL_ERROR | flags;
+
+ for (count = 10000; count >= 0; count--) {
+ c = readl(base + IMX_OCOTP_ADDR_CTRL);
+ if (!(c & mask))
+ break;
+ cpu_relax();
+ }
+
+ if (count < 0) {
+ /* HW_OCOTP_CTRL[ERROR] will be set under the following
+ * conditions:
+ * - A write is performed to a shadow register during a shadow
+ * reload (essentially, while HW_OCOTP_CTRL[RELOAD_SHADOWS] is
+ * set. In addition, the contents of the shadow register shall
+ * not be updated.
+ * - A write is performed to a shadow register which has been
+ * locked.
+ * - A read is performed to from a shadow register which has
+ * been read locked.
+ * - A program is performed to a fuse word which has been locked
+ * - A read is performed to from a fuse word which has been read
+ * locked.
+ */
+ if (c & IMX_OCOTP_BM_CTRL_ERROR)
+ return -EPERM;
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+}
+
static void imx_ocotp_clr_err_if_set(void __iomem *base)
{
u32 c;
@@ -71,12 +124,21 @@ static int imx_ocotp_read(void *context, unsigned int offset,
if (count > (priv->nregs - index))
count = priv->nregs - index;
+ mutex_lock(&ocotp_mutex);
+
ret = clk_prepare_enable(priv->clk);
if (ret < 0) {
+ mutex_unlock(&ocotp_mutex);
dev_err(priv->dev, "failed to prepare/enable ocotp clk\n");
return ret;
}
+ ret = imx_ocotp_wait_for_busy(priv->base, 0);
+ if (ret < 0) {
+ dev_err(priv->dev, "timeout during read setup\n");
+ goto read_end;
+ }
+
for (i = index; i < (index + count); i++) {
*buf++ = readl(priv->base + IMX_OCOTP_OFFSET_B0W0 +
i * IMX_OCOTP_OFFSET_PER_WORD);
@@ -90,18 +152,160 @@ static int imx_ocotp_read(void *context, unsigned int offset,
if (*(buf - 1) == IMX_OCOTP_READ_LOCKED_VAL)
imx_ocotp_clr_err_if_set(priv->base);
}
+ ret = 0;
+read_end:
clk_disable_unprepare(priv->clk);
- return 0;
+ mutex_unlock(&ocotp_mutex);
+ return ret;
+}
+
+static int imx_ocotp_write(void *context, unsigned int offset, void *val,
+ size_t bytes)
+{
+ struct ocotp_priv *priv = context;
+ u32 *buf = val;
+ int ret;
+
+ unsigned long clk_rate = 0;
+ unsigned long strobe_read, relax, strobe_prog;
+ u32 timing = 0;
+ u32 ctrl;
+ u8 waddr;
+
+ /* allow only writing one complete OTP word at a time */
+ if ((bytes != priv->config->word_size) ||
+ (offset % priv->config->word_size))
+ return -EINVAL;
+
+ mutex_lock(&ocotp_mutex);
+
+ ret = clk_prepare_enable(priv->clk);
+ if (ret < 0) {
+ mutex_unlock(&ocotp_mutex);
+ dev_err(priv->dev, "failed to prepare/enable ocotp clk\n");
+ return ret;
+ }
+
+ /* 47.3.1.3.1
+ * Program HW_OCOTP_TIMING[STROBE_PROG] and HW_OCOTP_TIMING[RELAX]
+ * fields with timing values to match the current frequency of the
+ * ipg_clk. OTP writes will work at maximum bus frequencies as long
+ * as the HW_OCOTP_TIMING parameters are set correctly.
+ */
+ clk_rate = clk_get_rate(priv->clk);
+
+ relax = clk_rate / (1000000000 / DEF_RELAX) - 1;
+ strobe_prog = clk_rate / (1000000000 / 10000) + 2 * (DEF_RELAX + 1) - 1;
+ strobe_read = clk_rate / (1000000000 / 40) + 2 * (DEF_RELAX + 1) - 1;
+
+ timing = strobe_prog & 0x00000FFF;
+ timing |= (relax << 12) & 0x0000F000;
+ timing |= (strobe_read << 16) & 0x003F0000;
+
+ writel(timing, priv->base + IMX_OCOTP_ADDR_TIMING);
+
+ /* 47.3.1.3.2
+ * Check that HW_OCOTP_CTRL[BUSY] and HW_OCOTP_CTRL[ERROR] are clear.
+ * Overlapped accesses are not supported by the controller. Any pending
+ * write or reload must be completed before a write access can be
+ * requested.
+ */
+ ret = imx_ocotp_wait_for_busy(priv->base, 0);
+ if (ret < 0) {
+ dev_err(priv->dev, "timeout during timing setup\n");
+ goto write_end;
+ }
+
+ /* 47.3.1.3.3
+ * Write the requested address to HW_OCOTP_CTRL[ADDR] and program the
+ * unlock code into HW_OCOTP_CTRL[WR_UNLOCK]. This must be programmed
+ * for each write access. The lock code is documented in the register
+ * description. Both the unlock code and address can be written in the
+ * same operation.
+ */
+ /* OTP write/read address specifies one of 128 word address locations */
+ waddr = offset / 4;
+
+ ctrl = readl(priv->base + IMX_OCOTP_ADDR_CTRL);
+ ctrl &= ~IMX_OCOTP_BM_CTRL_ADDR;
+ ctrl |= waddr & IMX_OCOTP_BM_CTRL_ADDR;
+ ctrl |= IMX_OCOTP_WR_UNLOCK;
+
+ writel(ctrl, priv->base + IMX_OCOTP_ADDR_CTRL);
+
+ /* 47.3.1.3.4
+ * Write the data to the HW_OCOTP_DATA register. This will automatically
+ * set HW_OCOTP_CTRL[BUSY] and clear HW_OCOTP_CTRL[WR_UNLOCK]. To
+ * protect programming same OTP bit twice, before program OCOTP will
+ * automatically read fuse value in OTP and use read value to mask
+ * program data. The controller will use masked program data to program
+ * a 32-bit word in the OTP per the address in HW_OCOTP_CTRL[ADDR]. Bit
+ * fields with 1's will result in that OTP bit being programmed. Bit
+ * fields with 0's will be ignored. At the same time that the write is
+ * accepted, the controller makes an internal copy of
+ * HW_OCOTP_CTRL[ADDR] which cannot be updated until the next write
+ * sequence is initiated. This copy guarantees that erroneous writes to
+ * HW_OCOTP_CTRL[ADDR] will not affect an active write operation. It
+ * should also be noted that during the programming HW_OCOTP_DATA will
+ * shift right (with zero fill). This shifting is required to program
+ * the OTP serially. During the write operation, HW_OCOTP_DATA cannot be
+ * modified.
+ */
+ writel(*buf, priv->base + IMX_OCOTP_ADDR_DATA);
+
+ /* 47.4.1.4.5
+ * Once complete, the controller will clear BUSY. A write request to a
+ * protected or locked region will result in no OTP access and no
+ * setting of HW_OCOTP_CTRL[BUSY]. In addition HW_OCOTP_CTRL[ERROR] will
+ * be set. It must be cleared by software before any new write access
+ * can be issued.
+ */
+ ret = imx_ocotp_wait_for_busy(priv->base, 0);
+ if (ret < 0) {
+ if (ret == -EPERM) {
+ dev_err(priv->dev, "failed write to locked region");
+ imx_ocotp_clr_err_if_set(priv->base);
+ } else {
+ dev_err(priv->dev, "timeout during data write\n");
+ }
+ goto write_end;
+ }
+
+ /* 47.3.1.4
+ * Write Postamble: Due to internal electrical characteristics of the
+ * OTP during writes, all OTP operations following a write must be
+ * separated by 2 us after the clearing of HW_OCOTP_CTRL_BUSY following
+ * the write.
+ */
+ udelay(2);
+
+ /* reload all shadow registers */
+ writel(IMX_OCOTP_BM_CTRL_REL_SHADOWS,
+ priv->base + IMX_OCOTP_ADDR_CTRL_SET);
+ ret = imx_ocotp_wait_for_busy(priv->base,
+ IMX_OCOTP_BM_CTRL_REL_SHADOWS);
+ if (ret < 0) {
+ dev_err(priv->dev, "timeout during shadow register reload\n");
+ goto write_end;
+ }
+
+write_end:
+ clk_disable_unprepare(priv->clk);
+ mutex_unlock(&ocotp_mutex);
+ if (ret < 0)
+ return ret;
+ return bytes;
}
static struct nvmem_config imx_ocotp_nvmem_config = {
.name = "imx-ocotp",
- .read_only = true,
+ .read_only = false,
.word_size = 4,
.stride = 4,
.owner = THIS_MODULE,
.reg_read = imx_ocotp_read,
+ .reg_write = imx_ocotp_write,
};
static const struct of_device_id imx_ocotp_dt_ids[] = {
@@ -139,7 +343,9 @@ static int imx_ocotp_probe(struct platform_device *pdev)
imx_ocotp_nvmem_config.size = 4 * priv->nregs;
imx_ocotp_nvmem_config.dev = dev;
imx_ocotp_nvmem_config.priv = priv;
+ priv->config = &imx_ocotp_nvmem_config;
nvmem = nvmem_register(&imx_ocotp_nvmem_config);
+
if (IS_ERR(nvmem))
return PTR_ERR(nvmem);
--
2.1.4
--
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* [PATCH 1/2] nvmem: imx-ocotp: clear error bit after reading locked values
From: Richard Leitner @ 2017-03-27 13:31 UTC (permalink / raw)
To: linux-kernel, srinivas.kandagatla, maxime.ripard
Cc: robh+dt, mark.rutland, devicetree, dev, Richard Leitner
When reading a "read locked" value from the OCOTP controller on i.MX6
SoC's an error bit is set. This bit has to be cleared by software before
any new write, read or reload access can be issued.
Therefore clear it after we detect such an "locked read".
Signed-off-by: Richard Leitner <richard.leitner@skidata.com>
---
drivers/nvmem/imx-ocotp.c | 41 ++++++++++++++++++++++++++++++++++++++---
1 file changed, 38 insertions(+), 3 deletions(-)
diff --git a/drivers/nvmem/imx-ocotp.c b/drivers/nvmem/imx-ocotp.c
index b8ca1e6..e2b62b3 100644
--- a/drivers/nvmem/imx-ocotp.c
+++ b/drivers/nvmem/imx-ocotp.c
@@ -25,6 +25,19 @@
#include <linux/platform_device.h>
#include <linux/slab.h>
+#define IMX_OCOTP_OFFSET_B0W0 0x400 /* Offset from base address of the
+ * OTP Bank0 Word0
+ */
+#define IMX_OCOTP_OFFSET_PER_WORD 0x10 /* Offset between the start addr
+ * of two consecutive OTP words.
+ */
+#define IMX_OCOTP_ADDR_CTRL 0x0000
+#define IMX_OCOTP_ADDR_CTRL_CLR 0x0008
+
+#define IMX_OCOTP_BM_CTRL_ERROR 0x00000200
+
+#define IMX_OCOTP_READ_LOCKED_VAL 0xBADABADA
+
struct ocotp_priv {
struct device *dev;
struct clk *clk;
@@ -32,6 +45,17 @@ struct ocotp_priv {
unsigned int nregs;
};
+static void imx_ocotp_clr_err_if_set(void __iomem *base)
+{
+ u32 c;
+
+ c = readl(base + IMX_OCOTP_ADDR_CTRL);
+ if (!(c & IMX_OCOTP_BM_CTRL_ERROR))
+ return;
+
+ writel(IMX_OCOTP_BM_CTRL_ERROR, base + IMX_OCOTP_ADDR_CTRL_CLR);
+}
+
static int imx_ocotp_read(void *context, unsigned int offset,
void *val, size_t bytes)
{
@@ -52,11 +76,22 @@ static int imx_ocotp_read(void *context, unsigned int offset,
dev_err(priv->dev, "failed to prepare/enable ocotp clk\n");
return ret;
}
- for (i = index; i < (index + count); i++)
- *buf++ = readl(priv->base + 0x400 + i * 0x10);
- clk_disable_unprepare(priv->clk);
+ for (i = index; i < (index + count); i++) {
+ *buf++ = readl(priv->base + IMX_OCOTP_OFFSET_B0W0 +
+ i * IMX_OCOTP_OFFSET_PER_WORD);
+
+ /* 47.3.1.2
+ * For "read locked" registers 0xBADABADA will be returned and
+ * HW_OCOTP_CTRL[ERROR] will be set. It must be cleared by
+ * software before any new write, read or reload access can be
+ * issued
+ */
+ if (*(buf - 1) == IMX_OCOTP_READ_LOCKED_VAL)
+ imx_ocotp_clr_err_if_set(priv->base);
+ }
+ clk_disable_unprepare(priv->clk);
return 0;
}
--
2.1.4
^ permalink raw reply related
* Re: [PATCH v4 1/6] dt-bindings: iio: rockchip-saradc: add support for rk3328
From: Heiko Stuebner @ 2017-03-27 13:25 UTC (permalink / raw)
To: cl-TNX95d0MmH7DzftRWevZcw, jic23-DgEjT+Ai2ygdnm+yROfE0A
Cc: mark.rutland-5wv7dgnIgG8, wsa-z923LK4zBo2bacvFa/9K2g,
linux-iio-u79uwXL29TY76Z2rM5mHXA, catalin.marinas-5wv7dgnIgG8,
shawn.lin-TNX95d0MmH7DzftRWevZcw, will.deacon-5wv7dgnIgG8,
kever.yang-TNX95d0MmH7DzftRWevZcw,
dianders-F7+t8E8rja9g9hUCZPvPmw,
yamada.masahiro-uWyLwvC0a2jby3iVrkZq2A,
tony.xie-TNX95d0MmH7DzftRWevZcw, linux-i2c-u79uwXL29TY76Z2rM5mHXA,
pmeerw-jW+XmwGofnusTnJN9+BGXg, lars-Qo5EllUWu/uELgA04lAiVw,
zhengxing-TNX95d0MmH7DzftRWevZcw, khilman-rdvid1DuHRBWk0Htik3J/w,
linux-rockchip-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
jay.xu-TNX95d0MmH7DzftRWevZcw, wxt-TNX95d0MmH7DzftRWevZcw,
huangtao-TNX95d0MmH7DzftRWevZcw,
devicetree-u79uwXL29TY76Z2rM5mHXA,
zhangqing-TNX95d0MmH7DzftRWevZcw,
paweljarosz3691-Re5JQEeQqe8AvxtiuMwx3w, arnd-r2nGTMty4D4,
yhx-TNX95d0MmH7DzftRWevZcw, knaack.h-Mmb7MZpHnFY,
robh+dt-DgEjT+Ai2ygdnm+yROfE0A,
matthias.bgg-Re5JQEeQqe8AvxtiuMwx3w,
rocky.hao-TNX95d0MmH7DzftRWevZcw,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
linux-kernel-u79uwXL29TY76Z2rM5mHXA,
david.wu-TNX95d0MmH7DzftRWevZcw, fabio.estevam-3arQi8VN3Tc,
andy.yan-TNX95d0MmH7DzftRWevZcw,
akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b,
shawnguo-DgEjT+Ai2ygdnm+yROfE0A, afaerber-l3A5Bk7waGM
In-Reply-To: <1490607650-18650-2-git-send-email-cl-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
Hi Jonathan,
Am Montag, 27. März 2017, 17:40:46 CEST schrieb cl-TNX95d0MmH7DzftRWevZcw@public.gmane.org:
> From: Liang Chen <cl-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
>
> The rk3328 saradc is the same as rk3399.
>
> Signed-off-by: Liang Chen <cl-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
> Reviewed-by: Heiko Stuebner <heiko-4mtYJXux2i+zQB+pC5nmwQ@public.gmane.org>
> Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
just for planning purposes, do you plan on picking this up or do you
want me to queue it with the rest of the changes (Ack needed).
Heiko
^ permalink raw reply
* [PATCH v3 9/9] arm,arm64,drivers: add a prefix to drivers arch_topology interfaces
From: Juri Lelli @ 2017-03-27 13:18 UTC (permalink / raw)
To: linux-kernel
Cc: linux-pm, linux-arm-kernel, devicetree, peterz, vincent.guittot,
robh+dt, mark.rutland, linux, sudeep.holla, lorenzo.pieralisi,
catalin.marinas, will.deacon, morten.rasmussen, dietmar.eggemann,
juri.lelli, broonie, gregkh
In-Reply-To: <20170327131825.32134-1-juri.lelli@arm.com>
Now that some functions that deal with arch topology information live
under drivers, there is a clash of naming that might create confusion.
Tidy things up by creating a drivers namespace for interfaces used by
arch code; achieve this by prepending a 'atd_' (arch topology driver)
prefix to driver interfaces.
Signed-off-by: Juri Lelli <juri.lelli@arm.com>
---
arch/arm/kernel/topology.c | 8 ++++----
arch/arm64/kernel/topology.c | 4 ++--
drivers/base/arch_topology.c | 20 ++++++++++----------
include/linux/arch_topology.h | 8 ++++----
4 files changed, 20 insertions(+), 20 deletions(-)
diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c
index 557be4f1d2d7..e53391026c1b 100644
--- a/arch/arm/kernel/topology.c
+++ b/arch/arm/kernel/topology.c
@@ -111,7 +111,7 @@ static void __init parse_dt_topology(void)
continue;
}
- if (parse_cpu_capacity(cn, cpu)) {
+ if (atd_parse_cpu_capacity(cn, cpu)) {
of_node_put(cn);
continue;
}
@@ -160,7 +160,7 @@ static void __init parse_dt_topology(void)
>> (SCHED_CAPACITY_SHIFT-1)) + 1;
if (cap_from_dt)
- normalize_cpu_capacity();
+ atd_normalize_cpu_capacity();
}
/*
@@ -173,10 +173,10 @@ static void update_cpu_capacity(unsigned int cpu)
if (!cpu_capacity(cpu) || cap_from_dt)
return;
- set_capacity_scale(cpu, cpu_capacity(cpu) / middle_capacity);
+ atd_set_capacity_scale(cpu, cpu_capacity(cpu) / middle_capacity);
pr_info("CPU%u: update cpu_capacity %lu\n",
- cpu, arch_scale_cpu_capacity(NULL, cpu));
+ cpu, atd_scale_cpu_capacity(NULL, cpu));
}
#else
diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c
index 255230c3e835..5f24faa09c05 100644
--- a/arch/arm64/kernel/topology.c
+++ b/arch/arm64/kernel/topology.c
@@ -39,7 +39,7 @@ static int __init get_cpu_for_node(struct device_node *node)
for_each_possible_cpu(cpu) {
if (of_get_cpu_node(cpu, NULL) == cpu_node) {
- parse_cpu_capacity(cpu_node, cpu);
+ atd_parse_cpu_capacity(cpu_node, cpu);
of_node_put(cpu_node);
return cpu;
}
@@ -191,7 +191,7 @@ static int __init parse_dt_topology(void)
if (ret != 0)
goto out_map;
- normalize_cpu_capacity();
+ atd_normalize_cpu_capacity();
/*
* Check that all cores are in the topology; the SMP code will
diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
index 0fc77fa900a9..87dca3320536 100644
--- a/drivers/base/arch_topology.c
+++ b/drivers/base/arch_topology.c
@@ -25,12 +25,12 @@
static DEFINE_MUTEX(cpu_scale_mutex);
static DEFINE_PER_CPU(unsigned long, cpu_scale) = SCHED_CAPACITY_SCALE;
-unsigned long arch_scale_cpu_capacity(struct sched_domain *sd, int cpu)
+unsigned long atd_scale_cpu_capacity(struct sched_domain *sd, int cpu)
{
return per_cpu(cpu_scale, cpu);
}
-void set_capacity_scale(unsigned int cpu, unsigned long capacity)
+void atd_set_capacity_scale(unsigned int cpu, unsigned long capacity)
{
per_cpu(cpu_scale, cpu) = capacity;
}
@@ -42,7 +42,7 @@ static ssize_t cpu_capacity_show(struct device *dev,
struct cpu *cpu = container_of(dev, struct cpu, dev);
return sprintf(buf, "%lu\n",
- arch_scale_cpu_capacity(NULL, cpu->dev.id));
+ atd_scale_cpu_capacity(NULL, cpu->dev.id));
}
static ssize_t cpu_capacity_store(struct device *dev,
@@ -67,7 +67,7 @@ static ssize_t cpu_capacity_store(struct device *dev,
mutex_lock(&cpu_scale_mutex);
for_each_cpu(i, &cpu_topology[this_cpu].core_sibling)
- set_capacity_scale(i, new_capacity);
+ atd_set_capacity_scale(i, new_capacity);
mutex_unlock(&cpu_scale_mutex);
return count;
@@ -96,7 +96,7 @@ static u32 capacity_scale;
static u32 *raw_capacity;
static bool cap_parsing_failed;
-void normalize_cpu_capacity(void)
+void atd_normalize_cpu_capacity(void)
{
u64 capacity;
int cpu;
@@ -111,14 +111,14 @@ void normalize_cpu_capacity(void)
cpu, raw_capacity[cpu]);
capacity = (raw_capacity[cpu] << SCHED_CAPACITY_SHIFT)
/ capacity_scale;
- set_capacity_scale(cpu, capacity);
+ atd_set_capacity_scale(cpu, capacity);
pr_debug("cpu_capacity: CPU%d cpu_capacity=%lu\n",
- cpu, arch_scale_cpu_capacity(NULL, cpu));
+ cpu, atd_scale_cpu_capacity(NULL, cpu));
}
mutex_unlock(&cpu_scale_mutex);
}
-int __init parse_cpu_capacity(struct device_node *cpu_node, int cpu)
+int __init atd_parse_cpu_capacity(struct device_node *cpu_node, int cpu)
{
int ret = 1;
u32 cpu_capacity;
@@ -183,12 +183,12 @@ init_cpu_capacity_callback(struct notifier_block *nb,
cpus_to_visit,
policy->related_cpus);
for_each_cpu(cpu, policy->related_cpus) {
- raw_capacity[cpu] = arch_scale_cpu_capacity(NULL, cpu) *
+ raw_capacity[cpu] = atd_scale_cpu_capacity(NULL, cpu) *
policy->cpuinfo.max_freq / 1000UL;
capacity_scale = max(raw_capacity[cpu], capacity_scale);
}
if (cpumask_empty(cpus_to_visit)) {
- normalize_cpu_capacity();
+ atd_normalize_cpu_capacity();
kfree(raw_capacity);
pr_debug("cpu_capacity: parsing done\n");
cap_parsing_done = true;
diff --git a/include/linux/arch_topology.h b/include/linux/arch_topology.h
index 4edae9fe8cdd..e25458d7ee9a 100644
--- a/include/linux/arch_topology.h
+++ b/include/linux/arch_topology.h
@@ -4,14 +4,14 @@
#ifndef _LINUX_ARCH_TOPOLOGY_H_
#define _LINUX_ARCH_TOPOLOGY_H_
-void normalize_cpu_capacity(void);
+void atd_normalize_cpu_capacity(void);
struct device_node;
-int parse_cpu_capacity(struct device_node *cpu_node, int cpu);
+int atd_parse_cpu_capacity(struct device_node *cpu_node, int cpu);
struct sched_domain;
-unsigned long arch_scale_cpu_capacity(struct sched_domain *sd, int cpu);
+unsigned long atd_scale_cpu_capacity(struct sched_domain *sd, int cpu);
-void set_capacity_scale(unsigned int cpu, unsigned long capacity);
+void atd_set_capacity_scale(unsigned int cpu, unsigned long capacity);
#endif /* _LINUX_ARCH_TOPOLOGY_H_ */
--
2.10.0
^ permalink raw reply related
* [PATCH v3 8/9] arm,arm64,drivers: move externs in a new header file
From: Juri Lelli @ 2017-03-27 13:18 UTC (permalink / raw)
To: linux-kernel
Cc: mark.rutland, devicetree, lorenzo.pieralisi, vincent.guittot,
juri.lelli, linux-pm, peterz, catalin.marinas, broonie,
will.deacon, gregkh, dietmar.eggemann, robh+dt, sudeep.holla,
linux, morten.rasmussen, linux-arm-kernel
In-Reply-To: <20170327131825.32134-1-juri.lelli@arm.com>
Create a new header file (include/linux/arch_topology.h) and put there
declarations of interfaces used by arm, arm64 and drivers code.
Signed-off-by: Juri Lelli <juri.lelli@arm.com>
---
arch/arm/kernel/topology.c | 7 +------
arch/arm64/kernel/topology.c | 4 +---
drivers/base/arch_topology.c | 1 +
include/linux/arch_topology.h | 17 +++++++++++++++++
4 files changed, 20 insertions(+), 9 deletions(-)
create mode 100644 include/linux/arch_topology.h
diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c
index 1e35a3265ddf..557be4f1d2d7 100644
--- a/arch/arm/kernel/topology.c
+++ b/arch/arm/kernel/topology.c
@@ -11,6 +11,7 @@
* for more details.
*/
+#include <linux/arch_topology.h>
#include <linux/cpu.h>
#include <linux/cpufreq.h>
#include <linux/cpumask.h>
@@ -45,10 +46,6 @@
* updated during this sequence.
*/
-extern unsigned long
-arch_scale_cpu_capacity(struct sched_domain *sd, int cpu);
-extern void set_capacity_scale(unsigned int cpu, unsigned long capacity);
-
#ifdef CONFIG_OF
struct cpu_efficiency {
const char *compatible;
@@ -76,8 +73,6 @@ static unsigned long *__cpu_capacity;
static unsigned long middle_capacity = 1;
static bool cap_from_dt = true;
-extern void normalize_cpu_capacity(void);
-extern int __init parse_cpu_capacity(struct device_node *cpu_node, int cpu);
/*
* Iterate all CPUs' descriptor in DT and compute the efficiency
diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c
index 7e1f6f75185b..255230c3e835 100644
--- a/arch/arm64/kernel/topology.c
+++ b/arch/arm64/kernel/topology.c
@@ -11,6 +11,7 @@
* for more details.
*/
+#include <linux/arch_topology.h>
#include <linux/cpu.h>
#include <linux/cpumask.h>
#include <linux/init.h>
@@ -27,9 +28,6 @@
#include <asm/cputype.h>
#include <asm/topology.h>
-extern void normalize_cpu_capacity(void);
-extern int __init parse_cpu_capacity(struct device_node *cpu_node, int cpu);
-
static int __init get_cpu_for_node(struct device_node *node)
{
struct device_node *cpu_node;
diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
index 6543a032b332..0fc77fa900a9 100644
--- a/drivers/base/arch_topology.c
+++ b/drivers/base/arch_topology.c
@@ -13,6 +13,7 @@
*/
#include <linux/acpi.h>
+#include <linux/arch_topology.h>
#include <linux/cpu.h>
#include <linux/cpufreq.h>
#include <linux/device.h>
diff --git a/include/linux/arch_topology.h b/include/linux/arch_topology.h
new file mode 100644
index 000000000000..4edae9fe8cdd
--- /dev/null
+++ b/include/linux/arch_topology.h
@@ -0,0 +1,17 @@
+/*
+ * include/linux/arch_topology.h - arch specific cpu topology information
+ */
+#ifndef _LINUX_ARCH_TOPOLOGY_H_
+#define _LINUX_ARCH_TOPOLOGY_H_
+
+void normalize_cpu_capacity(void);
+
+struct device_node;
+int parse_cpu_capacity(struct device_node *cpu_node, int cpu);
+
+struct sched_domain;
+unsigned long arch_scale_cpu_capacity(struct sched_domain *sd, int cpu);
+
+void set_capacity_scale(unsigned int cpu, unsigned long capacity);
+
+#endif /* _LINUX_ARCH_TOPOLOGY_H_ */
--
2.10.0
^ permalink raw reply related
* [PATCH v3 7/9] arm,arm64,drivers: reduce scope of cap_parsing_failed
From: Juri Lelli @ 2017-03-27 13:18 UTC (permalink / raw)
To: linux-kernel-u79uwXL29TY76Z2rM5mHXA
Cc: linux-pm-u79uwXL29TY76Z2rM5mHXA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
devicetree-u79uwXL29TY76Z2rM5mHXA, peterz-wEGCiKHe2LqWVfeAwA7xHQ,
vincent.guittot-QSEj5FYQhm4dnm+yROfE0A,
robh+dt-DgEjT+Ai2ygdnm+yROfE0A, mark.rutland-5wv7dgnIgG8,
linux-lFZ/pmaqli7XmaaqVzeoHQ, sudeep.holla-5wv7dgnIgG8,
lorenzo.pieralisi-5wv7dgnIgG8, catalin.marinas-5wv7dgnIgG8,
will.deacon-5wv7dgnIgG8, morten.rasmussen-5wv7dgnIgG8,
dietmar.eggemann-5wv7dgnIgG8, juri.lelli-5wv7dgnIgG8,
broonie-DgEjT+Ai2ygdnm+yROfE0A,
gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r
In-Reply-To: <20170327131825.32134-1-juri.lelli-5wv7dgnIgG8@public.gmane.org>
Reduce the scope of cap_parsing_failed (making it static in
drivers/base/arch_topology.c) by slightly changing {arm,arm64} DT
parsing code.
For arm checking for !cap_parsing_failed before calling normalize_
cpu_capacity() is superfluous, as returning an error from parse_
cpu_capacity() (above) means cap_from _dt is set to false.
For arm64 we can simply check if raw_capacity points to something,
which is not if capacity parsing has failed.
Suggested-by: Morten Rasmussen <morten.rasmussen-5wv7dgnIgG8@public.gmane.org>
Signed-off-by: Juri Lelli <juri.lelli-5wv7dgnIgG8@public.gmane.org>
---
arch/arm/kernel/topology.c | 3 +--
arch/arm64/kernel/topology.c | 5 +----
drivers/base/arch_topology.c | 4 ++--
3 files changed, 4 insertions(+), 8 deletions(-)
diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c
index 49ef025ffaa0..1e35a3265ddf 100644
--- a/arch/arm/kernel/topology.c
+++ b/arch/arm/kernel/topology.c
@@ -76,7 +76,6 @@ static unsigned long *__cpu_capacity;
static unsigned long middle_capacity = 1;
static bool cap_from_dt = true;
-extern bool cap_parsing_failed;
extern void normalize_cpu_capacity(void);
extern int __init parse_cpu_capacity(struct device_node *cpu_node, int cpu);
@@ -165,7 +164,7 @@ static void __init parse_dt_topology(void)
middle_capacity = ((max_capacity / 3)
>> (SCHED_CAPACITY_SHIFT-1)) + 1;
- if (cap_from_dt && !cap_parsing_failed)
+ if (cap_from_dt)
normalize_cpu_capacity();
}
diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c
index c5bc31eb97e8..7e1f6f75185b 100644
--- a/arch/arm64/kernel/topology.c
+++ b/arch/arm64/kernel/topology.c
@@ -27,7 +27,6 @@
#include <asm/cputype.h>
#include <asm/topology.h>
-extern bool cap_parsing_failed;
extern void normalize_cpu_capacity(void);
extern int __init parse_cpu_capacity(struct device_node *cpu_node, int cpu);
@@ -187,10 +186,8 @@ static int __init parse_dt_topology(void)
* cluster with restricted subnodes.
*/
map = of_get_child_by_name(cn, "cpu-map");
- if (!map) {
- cap_parsing_failed = true;
+ if (!map)
goto out;
- }
ret = parse_cluster(map, 0);
if (ret != 0)
diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
index b24d9a2af2c5..6543a032b332 100644
--- a/drivers/base/arch_topology.c
+++ b/drivers/base/arch_topology.c
@@ -93,7 +93,7 @@ subsys_initcall(register_cpu_capacity_sysctl);
static u32 capacity_scale;
static u32 *raw_capacity;
-bool cap_parsing_failed;
+static bool cap_parsing_failed;
void normalize_cpu_capacity(void)
{
@@ -208,7 +208,7 @@ static int __init register_cpufreq_notifier(void)
* until we have the necessary code to parse the cpu capacity, so
* skip registering cpufreq notifier.
*/
- if (!acpi_disabled || cap_parsing_failed)
+ if (!acpi_disabled || !raw_capacity)
return -EINVAL;
if (!alloc_cpumask_var(&cpus_to_visit, GFP_KERNEL)) {
--
2.10.0
--
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^ permalink raw reply related
* [PATCH v3 6/9] drivers: remove useless comment from base/arch_topology.c
From: Juri Lelli @ 2017-03-27 13:18 UTC (permalink / raw)
To: linux-kernel-u79uwXL29TY76Z2rM5mHXA
Cc: linux-pm-u79uwXL29TY76Z2rM5mHXA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
devicetree-u79uwXL29TY76Z2rM5mHXA, peterz-wEGCiKHe2LqWVfeAwA7xHQ,
vincent.guittot-QSEj5FYQhm4dnm+yROfE0A,
robh+dt-DgEjT+Ai2ygdnm+yROfE0A, mark.rutland-5wv7dgnIgG8,
linux-lFZ/pmaqli7XmaaqVzeoHQ, sudeep.holla-5wv7dgnIgG8,
lorenzo.pieralisi-5wv7dgnIgG8, catalin.marinas-5wv7dgnIgG8,
will.deacon-5wv7dgnIgG8, morten.rasmussen-5wv7dgnIgG8,
dietmar.eggemann-5wv7dgnIgG8, juri.lelli-5wv7dgnIgG8,
broonie-DgEjT+Ai2ygdnm+yROfE0A,
gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r
In-Reply-To: <20170327131825.32134-1-juri.lelli-5wv7dgnIgG8@public.gmane.org>
Printing out an error message when we failed to get the cpu device is
not helping anyone. Remove it.
Signed-off-by: Juri Lelli <juri.lelli-5wv7dgnIgG8@public.gmane.org>
---
drivers/base/arch_topology.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
index c33482121b7d..b24d9a2af2c5 100644
--- a/drivers/base/arch_topology.c
+++ b/drivers/base/arch_topology.c
@@ -81,11 +81,9 @@ static int register_cpu_capacity_sysctl(void)
for_each_possible_cpu(i) {
cpu = get_cpu_device(i);
- if (!cpu) {
- pr_err("%s: too early to get CPU%d device!\n",
- __func__, i);
+ if (!cpu)
continue;
- }
+
device_create_file(cpu, &dev_attr_cpu_capacity);
}
--
2.10.0
--
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^ permalink raw reply related
* [PATCH v3 5/9] arm, arm64: factorize common cpu capacity default code
From: Juri Lelli @ 2017-03-27 13:18 UTC (permalink / raw)
To: linux-kernel
Cc: mark.rutland, devicetree, lorenzo.pieralisi, vincent.guittot,
juri.lelli, linux-pm, peterz, catalin.marinas, broonie,
will.deacon, gregkh, dietmar.eggemann, Russell King, robh+dt,
sudeep.holla, linux, morten.rasmussen, linux-arm-kernel
In-Reply-To: <20170327131825.32134-1-juri.lelli@arm.com>
arm and arm64 share lot of code relative to parsing CPU capacity
information from DT, using that information for appropriate scaling and
exposing a sysfs interface for chaging such values at runtime.
Factorize such code in a common place (driver/base/arch_topology.c) in
preparation for further additions.
Suggested-by: Will Deacon <will.deacon@arm.com>
Suggested-by: Mark Rutland <mark.rutland@arm.com>
Suggested-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Juri Lelli <juri.lelli@arm.com>
---
Changes from v2:
- make capacity_scale and raw_capacity static
- added SPDX header
- improved indent
- misc. whitespaces/newlines fixes
Changes from v1:
- keep the original GPLv2 header
---
arch/arm/Kconfig | 1 +
arch/arm/kernel/topology.c | 213 ++-----------------------------------
arch/arm64/Kconfig | 1 +
arch/arm64/kernel/topology.c | 219 +--------------------------------------
drivers/base/Kconfig | 8 ++
drivers/base/Makefile | 1 +
drivers/base/arch_topology.c | 242 +++++++++++++++++++++++++++++++++++++++++++
7 files changed, 262 insertions(+), 423 deletions(-)
create mode 100644 drivers/base/arch_topology.c
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 0d4e71b42c77..cd61154bb6d0 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -25,6 +25,7 @@ config ARM
select EDAC_SUPPORT
select EDAC_ATOMIC_SCRUB
select GENERIC_ALLOCATOR
+ select GENERIC_ARCH_TOPOLOGY if ARM_CPU_TOPOLOGY
select GENERIC_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI)
select GENERIC_CLOCKEVENTS_BROADCAST if SMP
select GENERIC_EARLY_IOREMAP
diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c
index 162c82aeed96..49ef025ffaa0 100644
--- a/arch/arm/kernel/topology.c
+++ b/arch/arm/kernel/topology.c
@@ -44,75 +44,10 @@
* to run the rebalance_domains for all idle cores and the cpu_capacity can be
* updated during this sequence.
*/
-static DEFINE_PER_CPU(unsigned long, cpu_scale) = SCHED_CAPACITY_SCALE;
-static DEFINE_MUTEX(cpu_scale_mutex);
-unsigned long arch_scale_cpu_capacity(struct sched_domain *sd, int cpu)
-{
- return per_cpu(cpu_scale, cpu);
-}
-
-static void set_capacity_scale(unsigned int cpu, unsigned long capacity)
-{
- per_cpu(cpu_scale, cpu) = capacity;
-}
-
-static ssize_t cpu_capacity_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct cpu *cpu = container_of(dev, struct cpu, dev);
-
- return sprintf(buf, "%lu\n",
- arch_scale_cpu_capacity(NULL, cpu->dev.id));
-}
-
-static ssize_t cpu_capacity_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t count)
-{
- struct cpu *cpu = container_of(dev, struct cpu, dev);
- int this_cpu = cpu->dev.id, i;
- unsigned long new_capacity;
- ssize_t ret;
-
- if (count) {
- ret = kstrtoul(buf, 0, &new_capacity);
- if (ret)
- return ret;
- if (new_capacity > SCHED_CAPACITY_SCALE)
- return -EINVAL;
-
- mutex_lock(&cpu_scale_mutex);
- for_each_cpu(i, &cpu_topology[this_cpu].core_sibling)
- set_capacity_scale(i, new_capacity);
- mutex_unlock(&cpu_scale_mutex);
- }
-
- return count;
-}
-
-static DEVICE_ATTR_RW(cpu_capacity);
-
-static int register_cpu_capacity_sysctl(void)
-{
- int i;
- struct device *cpu;
-
- for_each_possible_cpu(i) {
- cpu = get_cpu_device(i);
- if (!cpu) {
- pr_err("%s: too early to get CPU%d device!\n",
- __func__, i);
- continue;
- }
- device_create_file(cpu, &dev_attr_cpu_capacity);
- }
-
- return 0;
-}
-subsys_initcall(register_cpu_capacity_sysctl);
+extern unsigned long
+arch_scale_cpu_capacity(struct sched_domain *sd, int cpu);
+extern void set_capacity_scale(unsigned int cpu, unsigned long capacity);
#ifdef CONFIG_OF
struct cpu_efficiency {
@@ -141,145 +76,9 @@ static unsigned long *__cpu_capacity;
static unsigned long middle_capacity = 1;
static bool cap_from_dt = true;
-static u32 *raw_capacity;
-static bool cap_parsing_failed;
-static u32 capacity_scale;
-
-static int __init parse_cpu_capacity(struct device_node *cpu_node, int cpu)
-{
- int ret = 1;
- u32 cpu_capacity;
-
- if (cap_parsing_failed)
- return !ret;
-
- ret = of_property_read_u32(cpu_node,
- "capacity-dmips-mhz",
- &cpu_capacity);
- if (!ret) {
- if (!raw_capacity) {
- raw_capacity = kcalloc(num_possible_cpus(),
- sizeof(*raw_capacity),
- GFP_KERNEL);
- if (!raw_capacity) {
- pr_err("cpu_capacity: failed to allocate memory for raw capacities\n");
- cap_parsing_failed = true;
- return ret;
- }
- }
- capacity_scale = max(cpu_capacity, capacity_scale);
- raw_capacity[cpu] = cpu_capacity;
- pr_debug("cpu_capacity: %s cpu_capacity=%u (raw)\n",
- cpu_node->full_name, raw_capacity[cpu]);
- } else {
- if (raw_capacity) {
- pr_err("cpu_capacity: missing %s raw capacity\n",
- cpu_node->full_name);
- pr_err("cpu_capacity: partial information: fallback to 1024 for all CPUs\n");
- }
- cap_parsing_failed = true;
- kfree(raw_capacity);
- }
-
- return !ret;
-}
-
-static void normalize_cpu_capacity(void)
-{
- u64 capacity;
- int cpu;
-
- if (!raw_capacity || cap_parsing_failed)
- return;
-
- pr_debug("cpu_capacity: capacity_scale=%u\n", capacity_scale);
- mutex_lock(&cpu_scale_mutex);
- for_each_possible_cpu(cpu) {
- capacity = (raw_capacity[cpu] << SCHED_CAPACITY_SHIFT)
- / capacity_scale;
- set_capacity_scale(cpu, capacity);
- pr_debug("cpu_capacity: CPU%d cpu_capacity=%lu\n",
- cpu, arch_scale_cpu_capacity(NULL, cpu));
- }
- mutex_unlock(&cpu_scale_mutex);
-}
-
-#ifdef CONFIG_CPU_FREQ
-static cpumask_var_t cpus_to_visit;
-static bool cap_parsing_done;
-static void parsing_done_workfn(struct work_struct *work);
-static DECLARE_WORK(parsing_done_work, parsing_done_workfn);
-
-static int
-init_cpu_capacity_callback(struct notifier_block *nb,
- unsigned long val,
- void *data)
-{
- struct cpufreq_policy *policy = data;
- int cpu;
-
- if (cap_parsing_failed || cap_parsing_done)
- return 0;
-
- switch (val) {
- case CPUFREQ_NOTIFY:
- pr_debug("cpu_capacity: init cpu capacity for CPUs [%*pbl] (to_visit=%*pbl)\n",
- cpumask_pr_args(policy->related_cpus),
- cpumask_pr_args(cpus_to_visit));
- cpumask_andnot(cpus_to_visit,
- cpus_to_visit,
- policy->related_cpus);
- for_each_cpu(cpu, policy->related_cpus) {
- raw_capacity[cpu] = arch_scale_cpu_capacity(NULL, cpu) *
- policy->cpuinfo.max_freq / 1000UL;
- capacity_scale = max(raw_capacity[cpu], capacity_scale);
- }
- if (cpumask_empty(cpus_to_visit)) {
- normalize_cpu_capacity();
- kfree(raw_capacity);
- pr_debug("cpu_capacity: parsing done\n");
- cap_parsing_done = true;
- schedule_work(&parsing_done_work);
- }
- }
- return 0;
-}
-
-static struct notifier_block init_cpu_capacity_notifier = {
- .notifier_call = init_cpu_capacity_callback,
-};
-
-static int __init register_cpufreq_notifier(void)
-{
- if (cap_parsing_failed)
- return -EINVAL;
-
- if (!alloc_cpumask_var(&cpus_to_visit, GFP_KERNEL)) {
- pr_err("cpu_capacity: failed to allocate memory for cpus_to_visit\n");
- return -ENOMEM;
- }
- cpumask_copy(cpus_to_visit, cpu_possible_mask);
-
- return cpufreq_register_notifier(&init_cpu_capacity_notifier,
- CPUFREQ_POLICY_NOTIFIER);
-}
-core_initcall(register_cpufreq_notifier);
-
-static void parsing_done_workfn(struct work_struct *work)
-{
- cpufreq_unregister_notifier(&init_cpu_capacity_notifier,
- CPUFREQ_POLICY_NOTIFIER);
-}
-
-#else
-static int __init free_raw_capacity(void)
-{
- kfree(raw_capacity);
-
- return 0;
-}
-core_initcall(free_raw_capacity);
-#endif
+extern bool cap_parsing_failed;
+extern void normalize_cpu_capacity(void);
+extern int __init parse_cpu_capacity(struct device_node *cpu_node, int cpu);
/*
* Iterate all CPUs' descriptor in DT and compute the efficiency
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 3741859765cf..e36fb12afad6 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -40,6 +40,7 @@ config ARM64
select EDAC_SUPPORT
select FRAME_POINTER
select GENERIC_ALLOCATOR
+ select GENERIC_ARCH_TOPOLOGY
select GENERIC_CLOCKEVENTS
select GENERIC_CLOCKEVENTS_BROADCAST
select GENERIC_CPU_AUTOPROBE
diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c
index 08243533e5ee..c5bc31eb97e8 100644
--- a/arch/arm64/kernel/topology.c
+++ b/arch/arm64/kernel/topology.c
@@ -11,7 +11,6 @@
* for more details.
*/
-#include <linux/acpi.h>
#include <linux/cpu.h>
#include <linux/cpumask.h>
#include <linux/init.h>
@@ -23,226 +22,14 @@
#include <linux/sched/topology.h>
#include <linux/slab.h>
#include <linux/string.h>
-#include <linux/cpufreq.h>
#include <asm/cpu.h>
#include <asm/cputype.h>
#include <asm/topology.h>
-static DEFINE_PER_CPU(unsigned long, cpu_scale) = SCHED_CAPACITY_SCALE;
-static DEFINE_MUTEX(cpu_scale_mutex);
-
-unsigned long arch_scale_cpu_capacity(struct sched_domain *sd, int cpu)
-{
- return per_cpu(cpu_scale, cpu);
-}
-
-static void set_capacity_scale(unsigned int cpu, unsigned long capacity)
-{
- per_cpu(cpu_scale, cpu) = capacity;
-}
-
-static ssize_t cpu_capacity_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct cpu *cpu = container_of(dev, struct cpu, dev);
-
- return sprintf(buf, "%lu\n",
- arch_scale_cpu_capacity(NULL, cpu->dev.id));
-}
-
-static ssize_t cpu_capacity_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t count)
-{
- struct cpu *cpu = container_of(dev, struct cpu, dev);
- int this_cpu = cpu->dev.id, i;
- unsigned long new_capacity;
- ssize_t ret;
-
- if (count) {
- ret = kstrtoul(buf, 0, &new_capacity);
- if (ret)
- return ret;
- if (new_capacity > SCHED_CAPACITY_SCALE)
- return -EINVAL;
-
- mutex_lock(&cpu_scale_mutex);
- for_each_cpu(i, &cpu_topology[this_cpu].core_sibling)
- set_capacity_scale(i, new_capacity);
- mutex_unlock(&cpu_scale_mutex);
- }
-
- return count;
-}
-
-static DEVICE_ATTR_RW(cpu_capacity);
-
-static int register_cpu_capacity_sysctl(void)
-{
- int i;
- struct device *cpu;
-
- for_each_possible_cpu(i) {
- cpu = get_cpu_device(i);
- if (!cpu) {
- pr_err("%s: too early to get CPU%d device!\n",
- __func__, i);
- continue;
- }
- device_create_file(cpu, &dev_attr_cpu_capacity);
- }
-
- return 0;
-}
-subsys_initcall(register_cpu_capacity_sysctl);
-
-static u32 capacity_scale;
-static u32 *raw_capacity;
-static bool cap_parsing_failed;
-
-static void __init parse_cpu_capacity(struct device_node *cpu_node, int cpu)
-{
- int ret;
- u32 cpu_capacity;
-
- if (cap_parsing_failed)
- return;
-
- ret = of_property_read_u32(cpu_node,
- "capacity-dmips-mhz",
- &cpu_capacity);
- if (!ret) {
- if (!raw_capacity) {
- raw_capacity = kcalloc(num_possible_cpus(),
- sizeof(*raw_capacity),
- GFP_KERNEL);
- if (!raw_capacity) {
- pr_err("cpu_capacity: failed to allocate memory for raw capacities\n");
- cap_parsing_failed = true;
- return;
- }
- }
- capacity_scale = max(cpu_capacity, capacity_scale);
- raw_capacity[cpu] = cpu_capacity;
- pr_debug("cpu_capacity: %s cpu_capacity=%u (raw)\n",
- cpu_node->full_name, raw_capacity[cpu]);
- } else {
- if (raw_capacity) {
- pr_err("cpu_capacity: missing %s raw capacity\n",
- cpu_node->full_name);
- pr_err("cpu_capacity: partial information: fallback to 1024 for all CPUs\n");
- }
- cap_parsing_failed = true;
- kfree(raw_capacity);
- }
-}
-
-static void normalize_cpu_capacity(void)
-{
- u64 capacity;
- int cpu;
-
- if (!raw_capacity || cap_parsing_failed)
- return;
-
- pr_debug("cpu_capacity: capacity_scale=%u\n", capacity_scale);
- mutex_lock(&cpu_scale_mutex);
- for_each_possible_cpu(cpu) {
- pr_debug("cpu_capacity: cpu=%d raw_capacity=%u\n",
- cpu, raw_capacity[cpu]);
- capacity = (raw_capacity[cpu] << SCHED_CAPACITY_SHIFT)
- / capacity_scale;
- set_capacity_scale(cpu, capacity);
- pr_debug("cpu_capacity: CPU%d cpu_capacity=%lu\n",
- cpu, arch_scale_cpu_capacity(NULL, cpu));
- }
- mutex_unlock(&cpu_scale_mutex);
-}
-
-#ifdef CONFIG_CPU_FREQ
-static cpumask_var_t cpus_to_visit;
-static bool cap_parsing_done;
-static void parsing_done_workfn(struct work_struct *work);
-static DECLARE_WORK(parsing_done_work, parsing_done_workfn);
-
-static int
-init_cpu_capacity_callback(struct notifier_block *nb,
- unsigned long val,
- void *data)
-{
- struct cpufreq_policy *policy = data;
- int cpu;
-
- if (cap_parsing_failed || cap_parsing_done)
- return 0;
-
- switch (val) {
- case CPUFREQ_NOTIFY:
- pr_debug("cpu_capacity: init cpu capacity for CPUs [%*pbl] (to_visit=%*pbl)\n",
- cpumask_pr_args(policy->related_cpus),
- cpumask_pr_args(cpus_to_visit));
- cpumask_andnot(cpus_to_visit,
- cpus_to_visit,
- policy->related_cpus);
- for_each_cpu(cpu, policy->related_cpus) {
- raw_capacity[cpu] = arch_scale_cpu_capacity(NULL, cpu) *
- policy->cpuinfo.max_freq / 1000UL;
- capacity_scale = max(raw_capacity[cpu], capacity_scale);
- }
- if (cpumask_empty(cpus_to_visit)) {
- normalize_cpu_capacity();
- kfree(raw_capacity);
- pr_debug("cpu_capacity: parsing done\n");
- cap_parsing_done = true;
- schedule_work(&parsing_done_work);
- }
- }
- return 0;
-}
-
-static struct notifier_block init_cpu_capacity_notifier = {
- .notifier_call = init_cpu_capacity_callback,
-};
-
-static int __init register_cpufreq_notifier(void)
-{
- /*
- * on ACPI-based systems we need to use the default cpu capacity
- * until we have the necessary code to parse the cpu capacity, so
- * skip registering cpufreq notifier.
- */
- if (!acpi_disabled || cap_parsing_failed)
- return -EINVAL;
-
- if (!alloc_cpumask_var(&cpus_to_visit, GFP_KERNEL)) {
- pr_err("cpu_capacity: failed to allocate memory for cpus_to_visit\n");
- return -ENOMEM;
- }
- cpumask_copy(cpus_to_visit, cpu_possible_mask);
-
- return cpufreq_register_notifier(&init_cpu_capacity_notifier,
- CPUFREQ_POLICY_NOTIFIER);
-}
-core_initcall(register_cpufreq_notifier);
-
-static void parsing_done_workfn(struct work_struct *work)
-{
- cpufreq_unregister_notifier(&init_cpu_capacity_notifier,
- CPUFREQ_POLICY_NOTIFIER);
-}
-
-#else
-static int __init free_raw_capacity(void)
-{
- kfree(raw_capacity);
-
- return 0;
-}
-core_initcall(free_raw_capacity);
-#endif
+extern bool cap_parsing_failed;
+extern void normalize_cpu_capacity(void);
+extern int __init parse_cpu_capacity(struct device_node *cpu_node, int cpu);
static int __init get_cpu_for_node(struct device_node *node)
{
diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
index d718ae4b907a..f046d21de57d 100644
--- a/drivers/base/Kconfig
+++ b/drivers/base/Kconfig
@@ -339,4 +339,12 @@ config CMA_ALIGNMENT
endif
+config GENERIC_ARCH_TOPOLOGY
+ bool
+ help
+ Enable support for architectures common topology code: e.g., parsing
+ CPU capacity information from DT, usage of such information for
+ appropriate scaling, sysfs interface for changing capacity values at
+ runtime.
+
endmenu
diff --git a/drivers/base/Makefile b/drivers/base/Makefile
index f2816f6ff76a..397e5c344e6a 100644
--- a/drivers/base/Makefile
+++ b/drivers/base/Makefile
@@ -23,6 +23,7 @@ obj-$(CONFIG_SOC_BUS) += soc.o
obj-$(CONFIG_PINCTRL) += pinctrl.o
obj-$(CONFIG_DEV_COREDUMP) += devcoredump.o
obj-$(CONFIG_GENERIC_MSI_IRQ_DOMAIN) += platform-msi.o
+obj-$(CONFIG_GENERIC_ARCH_TOPOLOGY) += arch_topology.o
obj-y += test/
diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
new file mode 100644
index 000000000000..c33482121b7d
--- /dev/null
+++ b/drivers/base/arch_topology.c
@@ -0,0 +1,242 @@
+/*
+ * Arch specific cpu topology information
+ *
+ * Copyright (C) 2016, ARM Ltd.
+ * Written by: Juri Lelli, ARM Ltd.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Released under the GPLv2 only.
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <linux/acpi.h>
+#include <linux/cpu.h>
+#include <linux/cpufreq.h>
+#include <linux/device.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/sched/topology.h>
+
+static DEFINE_MUTEX(cpu_scale_mutex);
+static DEFINE_PER_CPU(unsigned long, cpu_scale) = SCHED_CAPACITY_SCALE;
+
+unsigned long arch_scale_cpu_capacity(struct sched_domain *sd, int cpu)
+{
+ return per_cpu(cpu_scale, cpu);
+}
+
+void set_capacity_scale(unsigned int cpu, unsigned long capacity)
+{
+ per_cpu(cpu_scale, cpu) = capacity;
+}
+
+static ssize_t cpu_capacity_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct cpu *cpu = container_of(dev, struct cpu, dev);
+
+ return sprintf(buf, "%lu\n",
+ arch_scale_cpu_capacity(NULL, cpu->dev.id));
+}
+
+static ssize_t cpu_capacity_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t count)
+{
+ struct cpu *cpu = container_of(dev, struct cpu, dev);
+ int this_cpu = cpu->dev.id;
+ int i;
+ unsigned long new_capacity;
+ ssize_t ret;
+
+ if (!count)
+ return 0;
+
+ ret = kstrtoul(buf, 0, &new_capacity);
+ if (ret)
+ return ret;
+ if (new_capacity > SCHED_CAPACITY_SCALE)
+ return -EINVAL;
+
+ mutex_lock(&cpu_scale_mutex);
+ for_each_cpu(i, &cpu_topology[this_cpu].core_sibling)
+ set_capacity_scale(i, new_capacity);
+ mutex_unlock(&cpu_scale_mutex);
+
+ return count;
+}
+
+static DEVICE_ATTR_RW(cpu_capacity);
+
+static int register_cpu_capacity_sysctl(void)
+{
+ int i;
+ struct device *cpu;
+
+ for_each_possible_cpu(i) {
+ cpu = get_cpu_device(i);
+ if (!cpu) {
+ pr_err("%s: too early to get CPU%d device!\n",
+ __func__, i);
+ continue;
+ }
+ device_create_file(cpu, &dev_attr_cpu_capacity);
+ }
+
+ return 0;
+}
+subsys_initcall(register_cpu_capacity_sysctl);
+
+static u32 capacity_scale;
+static u32 *raw_capacity;
+bool cap_parsing_failed;
+
+void normalize_cpu_capacity(void)
+{
+ u64 capacity;
+ int cpu;
+
+ if (!raw_capacity || cap_parsing_failed)
+ return;
+
+ pr_debug("cpu_capacity: capacity_scale=%u\n", capacity_scale);
+ mutex_lock(&cpu_scale_mutex);
+ for_each_possible_cpu(cpu) {
+ pr_debug("cpu_capacity: cpu=%d raw_capacity=%u\n",
+ cpu, raw_capacity[cpu]);
+ capacity = (raw_capacity[cpu] << SCHED_CAPACITY_SHIFT)
+ / capacity_scale;
+ set_capacity_scale(cpu, capacity);
+ pr_debug("cpu_capacity: CPU%d cpu_capacity=%lu\n",
+ cpu, arch_scale_cpu_capacity(NULL, cpu));
+ }
+ mutex_unlock(&cpu_scale_mutex);
+}
+
+int __init parse_cpu_capacity(struct device_node *cpu_node, int cpu)
+{
+ int ret = 1;
+ u32 cpu_capacity;
+
+ if (cap_parsing_failed)
+ return !ret;
+
+ ret = of_property_read_u32(cpu_node,
+ "capacity-dmips-mhz",
+ &cpu_capacity);
+ if (!ret) {
+ if (!raw_capacity) {
+ raw_capacity = kcalloc(num_possible_cpus(),
+ sizeof(*raw_capacity),
+ GFP_KERNEL);
+ if (!raw_capacity) {
+ pr_err("cpu_capacity: failed to allocate memory for raw capacities\n");
+ cap_parsing_failed = true;
+ return ret;
+ }
+ }
+ capacity_scale = max(cpu_capacity, capacity_scale);
+ raw_capacity[cpu] = cpu_capacity;
+ pr_debug("cpu_capacity: %s cpu_capacity=%u (raw)\n",
+ cpu_node->full_name, raw_capacity[cpu]);
+ } else {
+ if (raw_capacity) {
+ pr_err("cpu_capacity: missing %s raw capacity\n",
+ cpu_node->full_name);
+ pr_err("cpu_capacity: partial information: fallback to 1024 for all CPUs\n");
+ }
+ cap_parsing_failed = true;
+ kfree(raw_capacity);
+ }
+
+ return !ret;
+}
+
+#ifdef CONFIG_CPU_FREQ
+static cpumask_var_t cpus_to_visit;
+static bool cap_parsing_done;
+static void parsing_done_workfn(struct work_struct *work);
+static DECLARE_WORK(parsing_done_work, parsing_done_workfn);
+
+static int
+init_cpu_capacity_callback(struct notifier_block *nb,
+ unsigned long val,
+ void *data)
+{
+ struct cpufreq_policy *policy = data;
+ int cpu;
+
+ if (cap_parsing_failed || cap_parsing_done)
+ return 0;
+
+ switch (val) {
+ case CPUFREQ_NOTIFY:
+ pr_debug("cpu_capacity: init cpu capacity for CPUs [%*pbl] (to_visit=%*pbl)\n",
+ cpumask_pr_args(policy->related_cpus),
+ cpumask_pr_args(cpus_to_visit));
+ cpumask_andnot(cpus_to_visit,
+ cpus_to_visit,
+ policy->related_cpus);
+ for_each_cpu(cpu, policy->related_cpus) {
+ raw_capacity[cpu] = arch_scale_cpu_capacity(NULL, cpu) *
+ policy->cpuinfo.max_freq / 1000UL;
+ capacity_scale = max(raw_capacity[cpu], capacity_scale);
+ }
+ if (cpumask_empty(cpus_to_visit)) {
+ normalize_cpu_capacity();
+ kfree(raw_capacity);
+ pr_debug("cpu_capacity: parsing done\n");
+ cap_parsing_done = true;
+ schedule_work(&parsing_done_work);
+ }
+ }
+ return 0;
+}
+
+static struct notifier_block init_cpu_capacity_notifier = {
+ .notifier_call = init_cpu_capacity_callback,
+};
+
+static int __init register_cpufreq_notifier(void)
+{
+ /*
+ * on ACPI-based systems we need to use the default cpu capacity
+ * until we have the necessary code to parse the cpu capacity, so
+ * skip registering cpufreq notifier.
+ */
+ if (!acpi_disabled || cap_parsing_failed)
+ return -EINVAL;
+
+ if (!alloc_cpumask_var(&cpus_to_visit, GFP_KERNEL)) {
+ pr_err("cpu_capacity: failed to allocate memory for cpus_to_visit\n");
+ return -ENOMEM;
+ }
+
+ cpumask_copy(cpus_to_visit, cpu_possible_mask);
+
+ return cpufreq_register_notifier(&init_cpu_capacity_notifier,
+ CPUFREQ_POLICY_NOTIFIER);
+}
+core_initcall(register_cpufreq_notifier);
+
+static void parsing_done_workfn(struct work_struct *work)
+{
+ cpufreq_unregister_notifier(&init_cpu_capacity_notifier,
+ CPUFREQ_POLICY_NOTIFIER);
+}
+
+#else
+static int __init free_raw_capacity(void)
+{
+ kfree(raw_capacity);
+
+ return 0;
+}
+core_initcall(free_raw_capacity);
+#endif
--
2.10.0
^ permalink raw reply related
* [PATCH v3 4/9] arm: remove wrong CONFIG_PROC_SYSCTL ifdef
From: Juri Lelli @ 2017-03-27 13:18 UTC (permalink / raw)
To: linux-kernel-u79uwXL29TY76Z2rM5mHXA
Cc: linux-pm-u79uwXL29TY76Z2rM5mHXA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
devicetree-u79uwXL29TY76Z2rM5mHXA, peterz-wEGCiKHe2LqWVfeAwA7xHQ,
vincent.guittot-QSEj5FYQhm4dnm+yROfE0A,
robh+dt-DgEjT+Ai2ygdnm+yROfE0A, mark.rutland-5wv7dgnIgG8,
linux-lFZ/pmaqli7XmaaqVzeoHQ, sudeep.holla-5wv7dgnIgG8,
lorenzo.pieralisi-5wv7dgnIgG8, catalin.marinas-5wv7dgnIgG8,
will.deacon-5wv7dgnIgG8, morten.rasmussen-5wv7dgnIgG8,
dietmar.eggemann-5wv7dgnIgG8, juri.lelli-5wv7dgnIgG8,
broonie-DgEjT+Ai2ygdnm+yROfE0A,
gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r
In-Reply-To: <20170327131825.32134-1-juri.lelli-5wv7dgnIgG8@public.gmane.org>
The sysfs cpu_capacity entry for each CPU has nothing to do with
PROC_FS, nor it's in /proc/sys path.
Remove such ifdef.
Cc: Russell King <linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org>
Reported-and-suggested-by: Sudeep Holla <sudeep.holla-5wv7dgnIgG8@public.gmane.org>
Fixes: 7e5930aaef5d ('ARM: 8622/3: add sysfs cpu_capacity attribute')
Signed-off-by: Juri Lelli <juri.lelli-5wv7dgnIgG8@public.gmane.org>
---
arch/arm/kernel/topology.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c
index 4e4af809606a..162c82aeed96 100644
--- a/arch/arm/kernel/topology.c
+++ b/arch/arm/kernel/topology.c
@@ -57,7 +57,6 @@ static void set_capacity_scale(unsigned int cpu, unsigned long capacity)
per_cpu(cpu_scale, cpu) = capacity;
}
-#ifdef CONFIG_PROC_SYSCTL
static ssize_t cpu_capacity_show(struct device *dev,
struct device_attribute *attr,
char *buf)
@@ -114,7 +113,6 @@ static int register_cpu_capacity_sysctl(void)
return 0;
}
subsys_initcall(register_cpu_capacity_sysctl);
-#endif
#ifdef CONFIG_OF
struct cpu_efficiency {
--
2.10.0
--
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^ permalink raw reply related
* [PATCH v3 3/9] arm: fix return value of parse_cpu_capacity
From: Juri Lelli @ 2017-03-27 13:18 UTC (permalink / raw)
To: linux-kernel-u79uwXL29TY76Z2rM5mHXA
Cc: linux-pm-u79uwXL29TY76Z2rM5mHXA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
devicetree-u79uwXL29TY76Z2rM5mHXA, peterz-wEGCiKHe2LqWVfeAwA7xHQ,
vincent.guittot-QSEj5FYQhm4dnm+yROfE0A,
robh+dt-DgEjT+Ai2ygdnm+yROfE0A, mark.rutland-5wv7dgnIgG8,
linux-lFZ/pmaqli7XmaaqVzeoHQ, sudeep.holla-5wv7dgnIgG8,
lorenzo.pieralisi-5wv7dgnIgG8, catalin.marinas-5wv7dgnIgG8,
will.deacon-5wv7dgnIgG8, morten.rasmussen-5wv7dgnIgG8,
dietmar.eggemann-5wv7dgnIgG8, juri.lelli-5wv7dgnIgG8,
broonie-DgEjT+Ai2ygdnm+yROfE0A,
gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r
In-Reply-To: <20170327131825.32134-1-juri.lelli-5wv7dgnIgG8@public.gmane.org>
parse_cpu_capacity() has to return 0 on failure, but it currently returns
1 instead if raw_capacity kcalloc failed.
Fix it by removing the negation of the return value.
Cc: Russell King <linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org>
Reported-by: Morten Rasmussen <morten.rasmussen-5wv7dgnIgG8@public.gmane.org>
Fixes: 06073ee26775 ('ARM: 8621/3: parse cpu capacity-dmips-mhz from DT')
Signed-off-by: Juri Lelli <juri.lelli-5wv7dgnIgG8@public.gmane.org>
---
arch/arm/kernel/topology.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c
index f8a3ab82e77f..4e4af809606a 100644
--- a/arch/arm/kernel/topology.c
+++ b/arch/arm/kernel/topology.c
@@ -166,7 +166,7 @@ static int __init parse_cpu_capacity(struct device_node *cpu_node, int cpu)
if (!raw_capacity) {
pr_err("cpu_capacity: failed to allocate memory for raw capacities\n");
cap_parsing_failed = true;
- return !ret;
+ return ret;
}
}
capacity_scale = max(cpu_capacity, capacity_scale);
--
2.10.0
--
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the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
^ permalink raw reply related
* [PATCH v3 2/9] Documentation/ABI: add information about cpu_capacity
From: Juri Lelli @ 2017-03-27 13:18 UTC (permalink / raw)
To: linux-kernel
Cc: linux-pm, linux-arm-kernel, devicetree, peterz, vincent.guittot,
robh+dt, mark.rutland, linux, sudeep.holla, lorenzo.pieralisi,
catalin.marinas, will.deacon, morten.rasmussen, dietmar.eggemann,
juri.lelli, broonie, gregkh
In-Reply-To: <20170327131825.32134-1-juri.lelli@arm.com>
/sys/devices/system/cpu/cpu#/cpu_capacity describe information about
CPUs heterogeneity (ref. to Documentation/devicetree/bindings/arm/
cpu-capacity.txt).
Add such description.
Signed-off-by: Juri Lelli <juri.lelli@arm.com>
---
Documentation/ABI/testing/sysfs-devices-system-cpu | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
index 2a4a423d08e0..f3d5817c4ef0 100644
--- a/Documentation/ABI/testing/sysfs-devices-system-cpu
+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
@@ -366,3 +366,10 @@ Contact: Linux ARM Kernel Mailing list <linux-arm-kernel@lists.infradead.org>
Description: AArch64 CPU registers
'identification' directory exposes the CPU ID registers for
identifying model and revision of the CPU.
+
+What: /sys/devices/system/cpu/cpu#/cpu_capacity
+Date: December 2016
+Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
+Description: information about CPUs heterogeneity.
+
+ cpu_capacity: capacity of cpu#.
--
2.10.0
^ permalink raw reply related
* [PATCH v3 1/9] Documentation: arm: fix wrong reference number in DT definition
From: Juri Lelli @ 2017-03-27 13:18 UTC (permalink / raw)
To: linux-kernel
Cc: mark.rutland, devicetree, lorenzo.pieralisi, vincent.guittot,
juri.lelli, linux-pm, peterz, catalin.marinas, broonie,
will.deacon, gregkh, dietmar.eggemann, robh+dt, sudeep.holla,
linux, morten.rasmussen, linux-arm-kernel
In-Reply-To: <20170327131825.32134-1-juri.lelli@arm.com>
Reference to cpu capacity binding has a wrong number. Fix it.
Reported-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Juri Lelli <juri.lelli@arm.com>
Acked-by: Rob Herring <robh@kernel.org>
---
Documentation/devicetree/bindings/arm/cpus.txt | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/Documentation/devicetree/bindings/arm/cpus.txt b/Documentation/devicetree/bindings/arm/cpus.txt
index 698ad1f097fa..83ec3fa0a05e 100644
--- a/Documentation/devicetree/bindings/arm/cpus.txt
+++ b/Documentation/devicetree/bindings/arm/cpus.txt
@@ -248,7 +248,7 @@ nodes to be present and contain the properties described below.
Usage: Optional
Value type: <u32>
Definition:
- # u32 value representing CPU capacity [3] in
+ # u32 value representing CPU capacity [4] in
DMIPS/MHz, relative to highest capacity-dmips-mhz
in the system.
@@ -475,5 +475,5 @@ cpus {
[2] arm/msm/qcom,kpss-acc.txt
[3] ARM Linux kernel documentation - idle states bindings
Documentation/devicetree/bindings/arm/idle-states.txt
-[3] ARM Linux kernel documentation - cpu capacity bindings
+[4] ARM Linux kernel documentation - cpu capacity bindings
Documentation/devicetree/bindings/arm/cpu-capacity.txt
--
2.10.0
^ permalink raw reply related
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