* [patch v8 1/4] drivers: jtag: Add JTAG core driver
From: Oleksandr Shamray @ 2017-09-08 16:13 UTC (permalink / raw)
To: gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r, arnd-r2nGTMty4D4
Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
devicetree-u79uwXL29TY76Z2rM5mHXA, openbmc-uLR06cmDAlY/bJ5BZ2RsiQ,
joel-U3u1mxZcP9KHXe+LvDLADg, jiri-rHqAuBHg3fBzbRFIqnYvSA,
tklauser-93Khv+1bN0NyDzI6CaY1VQ,
linux-serial-u79uwXL29TY76Z2rM5mHXA, mec-WqBc5aa1uDFeoWH0uzbU5w,
vadimp-45czdsxZ+A5DPfheJLI6IQ,
system-sw-low-level-VPRAkNaXOzVWk0Htik3J/w,
robh+dt-DgEjT+Ai2ygdnm+yROfE0A,
openocd-devel-owner-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f,
linux-api-u79uwXL29TY76Z2rM5mHXA, davem-fT/PcQaiUtIeIZ0/mPfg9Q,
mchehab-DgEjT+Ai2ygdnm+yROfE0A, Oleksandr Shamray, Jiri Pirko
In-Reply-To: <1504887229-2748-1-git-send-email-oleksandrs-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Initial patch for JTAG driver
JTAG class driver provide infrastructure to support hardware/software
JTAG platform drivers. It provide user layer API interface for flashing
and debugging external devices which equipped with JTAG interface
using standard transactions.
Driver exposes set of IOCTL to user space for:
- XFER:
- SIR (Scan Instruction Register, IEEE 1149.1 Data Register scan);
- SDR (Scan Data Register, IEEE 1149.1 Instruction Register scan);
- RUNTEST (Forces the IEEE 1149.1 bus to a run state for a specified
number of clocks).
- SIOCFREQ/GIOCFREQ for setting and reading JTAG frequency.
Driver core provides set of internal APIs for allocation and
registration:
- jtag_register;
- jtag_unregister;
- jtag_alloc;
- jtag_free;
Platform driver on registration with jtag-core creates the next
entry in dev folder:
/dev/jtagX
Signed-off-by: Oleksandr Shamray <oleksandrs-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Signed-off-by: Jiri Pirko <jiri-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Acked-by: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>
---
v7->v8
Comments pointed by Comments pointed by
- Fix misspelling s/friver/driver
v6->v7
Notifications from kbuild test robot <lkp-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
- Remove include asm/types.h from jtag.h
- Add include <linux/types.h> to jtag.c
v5->v6
v4->v5
v3->v4
Comments pointed by Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>
- change transaction pointer tdio type to __u64
- change internal status type from enum to __u32
- reorder jtag_xfer members to avoid the implied padding
- add __packed attribute to jtag_xfer and jtag_run_test_idle
v2->v3
Notifications from kbuild test robot <lkp-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
- Change include path to <linux/types.h> in jtag.h
v1->v2
Comments pointed by Greg KH <gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>
- Change license type from GPLv2/BSD to GPLv2
- Change type of variables which crossed user/kernel to __type
- Remove "default n" from Kconfig
Comments pointed by Andrew Lunn <andrew-g2DYL2Zd6BY@public.gmane.org>
- Change list_add_tail in jtag_unregister to list_del
Comments pointed by Neil Armstrong <narmstrong-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>
- Add SPDX-License-Identifier instead of license text
Comments pointed by Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>
- Change __copy_to_user to memdup_user
- Change __put_user to put_user
- Change type of variables to __type for compatible 32 and 64-bit systems
- Add check for maximum xfer data size
- Change lookup data mechanism to get jtag data from inode
- Add .compat_ioctl to file ops
- Add mem alignment for jtag priv data
Comments pointed by Tobias Klauser <tklauser-93Khv+1bN0NyDzI6CaY1VQ@public.gmane.org>
- Change function names to avoid match with variable types
- Fix description for jtag_ru_test_idle in uapi jtag.h
- Fix misprints IDEL/IDLE, trough/through
---
Documentation/ioctl/ioctl-number.txt | 2 +
MAINTAINERS | 8 +
drivers/Kconfig | 2 +
drivers/Makefile | 1 +
drivers/jtag/Kconfig | 16 ++
drivers/jtag/Makefile | 1 +
drivers/jtag/jtag.c | 312 ++++++++++++++++++++++++++++++++++
include/linux/jtag.h | 48 +++++
include/uapi/linux/jtag.h | 111 ++++++++++++
9 files changed, 501 insertions(+), 0 deletions(-)
create mode 100644 drivers/jtag/Kconfig
create mode 100644 drivers/jtag/Makefile
create mode 100644 drivers/jtag/jtag.c
create mode 100644 include/linux/jtag.h
create mode 100644 include/uapi/linux/jtag.h
diff --git a/Documentation/ioctl/ioctl-number.txt b/Documentation/ioctl/ioctl-number.txt
index 3e3fdae..1af2508 100644
--- a/Documentation/ioctl/ioctl-number.txt
+++ b/Documentation/ioctl/ioctl-number.txt
@@ -321,6 +321,8 @@ Code Seq#(hex) Include File Comments
0xB0 all RATIO devices in development:
<mailto:vgo-/IYFIZglx74@public.gmane.org>
0xB1 00-1F PPPoX <mailto:mostrows-TTukF6hB3AoKZpuMuFhwt/d9D2ou9A/h@public.gmane.org>
+0xB2 00-0f linux/jtag.h JTAG driver
+ <mailto:oleksandrs-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
0xB3 00 linux/mmc/ioctl.h
0xB4 00-0F linux/gpio.h <mailto:linux-gpio-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
0xB5 00-0F uapi/linux/rpmsg.h <mailto:linux-remoteproc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index 205d397..141aeaf 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7292,6 +7292,14 @@ L: linux-serial-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
S: Maintained
F: drivers/tty/serial/jsm/
+JTAG SUBSYSTEM
+M: Oleksandr Shamray <oleksandrs-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
+M: Vadim Pasternak <vadimp-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
+S: Maintained
+F: include/linux/jtag.h
+F: include/uapi/linux/jtag.h
+F: drivers/jtag/
+
K10TEMP HARDWARE MONITORING DRIVER
M: Clemens Ladisch <clemens-P6GI/4k7KOmELgA04lAiVw@public.gmane.org>
L: linux-hwmon-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
diff --git a/drivers/Kconfig b/drivers/Kconfig
index 505c676..2214678 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -208,4 +208,6 @@ source "drivers/tee/Kconfig"
source "drivers/mux/Kconfig"
+source "drivers/jtag/Kconfig"
+
endmenu
diff --git a/drivers/Makefile b/drivers/Makefile
index dfdcda0..6a2059b 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -182,3 +182,4 @@ obj-$(CONFIG_FPGA) += fpga/
obj-$(CONFIG_FSI) += fsi/
obj-$(CONFIG_TEE) += tee/
obj-$(CONFIG_MULTIPLEXER) += mux/
+obj-$(CONFIG_JTAG) += jtag/
diff --git a/drivers/jtag/Kconfig b/drivers/jtag/Kconfig
new file mode 100644
index 0000000..0fad1a3
--- /dev/null
+++ b/drivers/jtag/Kconfig
@@ -0,0 +1,16 @@
+menuconfig JTAG
+ tristate "JTAG support"
+ ---help---
+ This provides basic core functionality support for jtag class devices
+ Hardware equipped with JTAG microcontroller which can be built
+ on top of this drivers. Driver exposes the set of IOCTL to the
+ user space for:
+ SIR (Scan Instruction Register, IEEE 1149.1 Data Register scan);
+ SDR (Scan Data Register, IEEE 1149.1 Instruction Register scan);
+ RUNTEST (Forces IEEE 1149.1 bus to a run state for specified
+ number of clocks).
+
+ If you want this support, you should say Y here.
+
+ To compile this driver as a module, choose M here: the module will
+ be called jtag.
diff --git a/drivers/jtag/Makefile b/drivers/jtag/Makefile
new file mode 100644
index 0000000..af37493
--- /dev/null
+++ b/drivers/jtag/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_JTAG) += jtag.o
diff --git a/drivers/jtag/jtag.c b/drivers/jtag/jtag.c
new file mode 100644
index 0000000..e0e63e5
--- /dev/null
+++ b/drivers/jtag/jtag.c
@@ -0,0 +1,312 @@
+/*
+ * drivers/jtag/jtag.c
+ *
+ * Copyright (c) 2017 Mellanox Technologies. All rights reserved.
+ * Copyright (c) 2017 Oleksandr Shamray <oleksandrs-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
+ *
+ * Released under the GPLv2 only.
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <linux/cdev.h>
+#include <linux/device.h>
+#include <linux/jtag.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/rtnetlink.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+#include <uapi/linux/jtag.h>
+
+struct jtag {
+ struct list_head list;
+ struct device *dev;
+ struct cdev cdev;
+ int id;
+ spinlock_t lock;
+ int open;
+ const struct jtag_ops *ops;
+ unsigned long priv[0] __aligned(ARCH_DMA_MINALIGN);
+};
+
+static dev_t jtag_devt;
+static LIST_HEAD(jtag_list);
+static DEFINE_MUTEX(jtag_mutex);
+static DEFINE_IDA(jtag_ida);
+
+void *jtag_priv(struct jtag *jtag)
+{
+ return jtag->priv;
+}
+EXPORT_SYMBOL_GPL(jtag_priv);
+
+static __u64 jtag_copy_from_user(__u64 udata, unsigned long bit_size)
+{
+ unsigned long size;
+ void *kdata;
+
+ size = DIV_ROUND_UP(bit_size, BITS_PER_BYTE);
+ kdata = memdup_user(u64_to_user_ptr(udata), size);
+
+ return (__u64)(uintptr_t)kdata;
+}
+
+static unsigned long jtag_copy_to_user(__u64 udata, __u64 kdata,
+ unsigned long bit_size)
+{
+ unsigned long size;
+
+ size = DIV_ROUND_UP(bit_size, BITS_PER_BYTE);
+
+ return copy_to_user(u64_to_user_ptr(udata), jtag_u64_to_ptr(kdata),
+ size);
+}
+
+static struct class jtag_class = {
+ .name = "jtag",
+ .owner = THIS_MODULE,
+};
+
+static int jtag_run_test_idle_op(struct jtag *jtag,
+ struct jtag_run_test_idle *idle)
+{
+ if (jtag->ops->idle)
+ return jtag->ops->idle(jtag, idle);
+ else
+ return -EOPNOTSUPP;
+}
+
+static int jtag_xfer_op(struct jtag *jtag, struct jtag_xfer *xfer)
+{
+ if (jtag->ops->xfer)
+ return jtag->ops->xfer(jtag, xfer);
+ else
+ return -EOPNOTSUPP;
+}
+
+static long jtag_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ struct jtag *jtag = file->private_data;
+ __u32 *uarg = (__u32 __user *)arg;
+ void *varg = (void __user *)arg;
+ struct jtag_run_test_idle idle;
+ struct jtag_xfer xfer;
+ __u64 tdio_user;
+ u32 value;
+ int err;
+
+ switch (cmd) {
+ case JTAG_GIOCFREQ:
+ if (jtag->ops->freq_get)
+ err = jtag->ops->freq_get(jtag, &value);
+ else
+ err = -EOPNOTSUPP;
+ if (err)
+ break;
+
+ err = put_user(value, uarg);
+ break;
+
+ case JTAG_SIOCFREQ:
+ err = __get_user(value, uarg);
+
+ if (value == 0)
+ err = -EINVAL;
+ if (err)
+ break;
+
+ if (jtag->ops->freq_set)
+ err = jtag->ops->freq_set(jtag, value);
+ else
+ err = -EOPNOTSUPP;
+ break;
+
+ case JTAG_IOCRUNTEST:
+ if (copy_from_user(&idle, varg,
+ sizeof(struct jtag_run_test_idle)))
+ return -ENOMEM;
+ err = jtag_run_test_idle_op(jtag, &idle);
+ break;
+
+ case JTAG_IOCXFER:
+ if (copy_from_user(&xfer, varg, sizeof(struct jtag_xfer)))
+ return -EFAULT;
+
+ if (xfer.length >= JTAG_MAX_XFER_DATA_LEN)
+ return -EFAULT;
+
+ tdio_user = xfer.tdio;
+ xfer.tdio = jtag_copy_from_user(xfer.tdio, xfer.length);
+ if (!xfer.tdio)
+ return -ENOMEM;
+
+ err = jtag_xfer_op(jtag, &xfer);
+ if (jtag_copy_to_user(tdio_user, xfer.tdio, xfer.length)) {
+ kfree(jtag_u64_to_ptr(xfer.tdio));
+ return -EFAULT;
+ }
+
+ kfree(jtag_u64_to_ptr(xfer.tdio));
+ xfer.tdio = tdio_user;
+ if (copy_to_user(varg, &xfer, sizeof(struct jtag_xfer)))
+ return -EFAULT;
+ break;
+
+ case JTAG_GIOCSTATUS:
+ if (jtag->ops->status_get)
+ err = jtag->ops->status_get(jtag, &value);
+ else
+ err = -EOPNOTSUPP;
+ if (err)
+ break;
+
+ err = put_user(value, uarg);
+ break;
+
+ default:
+ return -EINVAL;
+ }
+ return err;
+}
+
+#ifdef CONFIG_COMPAT
+static long jtag_ioctl_compat(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ return jtag_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
+}
+#endif
+
+static int jtag_open(struct inode *inode, struct file *file)
+{
+ struct jtag *jtag = container_of(inode->i_cdev, struct jtag, cdev);
+
+ spin_lock(&jtag->lock);
+
+ if (jtag->open) {
+ dev_info(NULL, "jtag already opened\n");
+ spin_unlock(&jtag->lock);
+ return -EBUSY;
+ }
+
+ jtag->open++;
+ file->private_data = jtag;
+ spin_unlock(&jtag->lock);
+ return 0;
+}
+
+static int jtag_release(struct inode *inode, struct file *file)
+{
+ struct jtag *jtag = file->private_data;
+
+ spin_lock(&jtag->lock);
+ jtag->open--;
+ spin_unlock(&jtag->lock);
+ return 0;
+}
+
+static const struct file_operations jtag_fops = {
+ .owner = THIS_MODULE,
+ .open = jtag_open,
+ .release = jtag_release,
+ .llseek = noop_llseek,
+ .unlocked_ioctl = jtag_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = jtag_ioctl_compat,
+#endif
+};
+
+struct jtag *jtag_alloc(size_t priv_size, const struct jtag_ops *ops)
+{
+ struct jtag *jtag;
+
+ jtag = kzalloc(sizeof(*jtag) + round_up(priv_size, ARCH_DMA_MINALIGN),
+ GFP_KERNEL);
+ if (!jtag)
+ return NULL;
+
+ jtag->ops = ops;
+ return jtag;
+}
+EXPORT_SYMBOL_GPL(jtag_alloc);
+
+void jtag_free(struct jtag *jtag)
+{
+ kfree(jtag);
+}
+EXPORT_SYMBOL_GPL(jtag_free);
+
+int jtag_register(struct jtag *jtag)
+{
+ int id;
+ int err;
+
+ id = ida_simple_get(&jtag_ida, 0, 0, GFP_KERNEL);
+ if (id < 0)
+ return id;
+
+ jtag->id = id;
+ cdev_init(&jtag->cdev, &jtag_fops);
+ jtag->cdev.owner = THIS_MODULE;
+ err = cdev_add(&jtag->cdev, MKDEV(MAJOR(jtag_devt), jtag->id), 1);
+ if (err)
+ goto err_cdev;
+
+ /* Register this jtag device with the driver core */
+ jtag->dev = device_create(&jtag_class, NULL, MKDEV(MAJOR(jtag_devt),
+ jtag->id),
+ NULL, "jtag%d", jtag->id);
+ if (!jtag->dev)
+ goto err_device_create;
+
+ jtag->open = 0;
+ dev_set_drvdata(jtag->dev, jtag);
+ spin_lock_init(&jtag->lock);
+ mutex_lock(&jtag_mutex);
+ list_add_tail(&jtag->list, &jtag_list);
+ mutex_unlock(&jtag_mutex);
+ return err;
+
+err_device_create:
+ cdev_del(&jtag->cdev);
+err_cdev:
+ ida_simple_remove(&jtag_ida, id);
+ return err;
+}
+EXPORT_SYMBOL_GPL(jtag_register);
+
+void jtag_unregister(struct jtag *jtag)
+{
+ struct device *dev = jtag->dev;
+
+ mutex_lock(&jtag_mutex);
+ list_del(&jtag->list);
+ mutex_unlock(&jtag_mutex);
+ cdev_del(&jtag->cdev);
+ device_unregister(dev);
+ ida_simple_remove(&jtag_ida, jtag->id);
+}
+EXPORT_SYMBOL_GPL(jtag_unregister);
+
+static int __init jtag_init(void)
+{
+ int err;
+
+ err = alloc_chrdev_region(&jtag_devt, 0, 1, "jtag");
+ if (err)
+ return err;
+ return class_register(&jtag_class);
+}
+
+static void __exit jtag_exit(void)
+{
+ class_unregister(&jtag_class);
+}
+
+module_init(jtag_init);
+module_exit(jtag_exit);
+
+MODULE_AUTHOR("Oleksandr Shamray <oleksandrs-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>");
+MODULE_DESCRIPTION("Generic jtag support");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/jtag.h b/include/linux/jtag.h
new file mode 100644
index 0000000..c016fed
--- /dev/null
+++ b/include/linux/jtag.h
@@ -0,0 +1,48 @@
+/*
+ * drivers/jtag/jtag.c
+ *
+ * Copyright (c) 2017 Mellanox Technologies. All rights reserved.
+ * Copyright (c) 2017 Oleksandr Shamray <oleksandrs-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
+ *
+ * Released under the GPLv2 only.
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#ifndef __JTAG_H
+#define __JTAG_H
+
+#include <uapi/linux/jtag.h>
+
+#ifndef ARCH_DMA_MINALIGN
+#define ARCH_DMA_MINALIGN 1
+#endif
+
+#define jtag_u64_to_ptr(arg) ((void *)(uintptr_t)arg)
+
+#define JTAG_MAX_XFER_DATA_LEN 65535
+
+struct jtag;
+/**
+ * struct jtag_ops - callbacks for jtag control functions:
+ *
+ * @freq_get: get frequency function. Filled by device driver
+ * @freq_set: set frequency function. Filled by device driver
+ * @status_get: set status function. Filled by device driver
+ * @idle: set JTAG to idle state function. Filled by device driver
+ * @xfer: send JTAG xfer function. Filled by device driver
+ */
+struct jtag_ops {
+ int (*freq_get)(struct jtag *jtag, u32 *freq);
+ int (*freq_set)(struct jtag *jtag, u32 freq);
+ int (*status_get)(struct jtag *jtag, u32 *state);
+ int (*idle)(struct jtag *jtag, struct jtag_run_test_idle *idle);
+ int (*xfer)(struct jtag *jtag, struct jtag_xfer *xfer);
+};
+
+void *jtag_priv(struct jtag *jtag);
+int jtag_register(struct jtag *jtag);
+void jtag_unregister(struct jtag *jtag);
+struct jtag *jtag_alloc(size_t priv_size, const struct jtag_ops *ops);
+void jtag_free(struct jtag *jtag);
+
+#endif /* __JTAG_H */
diff --git a/include/uapi/linux/jtag.h b/include/uapi/linux/jtag.h
new file mode 100644
index 0000000..af22ea6
--- /dev/null
+++ b/include/uapi/linux/jtag.h
@@ -0,0 +1,111 @@
+/*
+ * JTAG class driver
+ *
+ * Copyright (c) 2017 Mellanox Technologies. All rights reserved.
+ * Copyright (c) 2017 Oleksandr Shamray <oleksandrs-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
+ *
+ * Released under the GPLv2/BSD.
+ * SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+ */
+
+#ifndef __UAPI_LINUX_JTAG_H
+#define __UAPI_LINUX_JTAG_H
+
+/**
+ * enum jtag_xfer_mode:
+ *
+ * @JTAG_XFER_HW_MODE: hardware mode transfer
+ * @JTAG_XFER_SW_MODE: software mode transfer
+ */
+enum jtag_xfer_mode {
+ JTAG_XFER_HW_MODE,
+ JTAG_XFER_SW_MODE,
+};
+
+/**
+ * enum jtag_endstate:
+ *
+ * @JTAG_STATE_IDLE: JTAG state machine IDLE state
+ * @JTAG_STATE_PAUSEIR: JTAG state machine PAUSE_IR state
+ * @JTAG_STATE_PAUSEDR: JTAG state machine PAUSE_DR state
+ */
+enum jtag_endstate {
+ JTAG_STATE_IDLE,
+ JTAG_STATE_PAUSEIR,
+ JTAG_STATE_PAUSEDR,
+};
+
+/**
+ * enum jtag_xfer_type:
+ *
+ * @JTAG_SIR_XFER: SIR transfer
+ * @JTAG_SDR_XFER: SDR transfer
+ */
+enum jtag_xfer_type {
+ JTAG_SIR_XFER,
+ JTAG_SDR_XFER,
+};
+
+/**
+ * enum jtag_xfer_direction:
+ *
+ * @JTAG_READ_XFER: read transfer
+ * @JTAG_WRITE_XFER: write transfer
+ */
+enum jtag_xfer_direction {
+ JTAG_READ_XFER,
+ JTAG_WRITE_XFER,
+};
+
+/**
+ * struct jtag_run_test_idle - forces JTAG state machine to
+ * RUN_TEST/IDLE state
+ *
+ * @mode: access mode
+ * @reset: 0 - run IDLE/PAUSE from current state
+ * 1 - go through TEST_LOGIC/RESET state before IDLE/PAUSE
+ * @end: completion flag
+ * @tck: clock counter
+ *
+ * Structure represents interface to JTAG device for jtag idle
+ * execution.
+ */
+struct jtag_run_test_idle {
+ __u8 mode;
+ __u8 reset;
+ __u8 endstate;
+ __u8 tck;
+};
+
+/**
+ * struct jtag_xfer - jtag xfer:
+ *
+ * @mode: access mode
+ * @type: transfer type
+ * @direction: xfer direction
+ * @length: xfer bits len
+ * @tdio : xfer data array
+ * @endir: xfer end state
+ *
+ * Structure represents interface to Aspeed JTAG device for jtag sdr xfer
+ * execution.
+ */
+struct jtag_xfer {
+ __u8 mode;
+ __u8 type;
+ __u8 direction;
+ __u8 endstate;
+ __u32 length;
+ __u64 tdio;
+};
+
+#define __JTAG_IOCTL_MAGIC 0xb2
+
+#define JTAG_IOCRUNTEST _IOW(__JTAG_IOCTL_MAGIC, 0,\
+ struct jtag_run_test_idle)
+#define JTAG_SIOCFREQ _IOW(__JTAG_IOCTL_MAGIC, 1, unsigned int)
+#define JTAG_GIOCFREQ _IOR(__JTAG_IOCTL_MAGIC, 2, unsigned int)
+#define JTAG_IOCXFER _IOWR(__JTAG_IOCTL_MAGIC, 3, struct jtag_xfer)
+#define JTAG_GIOCSTATUS _IOWR(__JTAG_IOCTL_MAGIC, 4, enum jtag_endstate)
+
+#endif /* __UAPI_LINUX_JTAG_H */
--
1.7.1
--
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^ permalink raw reply related
* [patch v8 0/4] JTAG driver introduction
From: Oleksandr Shamray @ 2017-09-08 16:13 UTC (permalink / raw)
To: gregkh, arnd
Cc: linux-kernel, linux-arm-kernel, devicetree, openbmc, joel, jiri,
tklauser, linux-serial, mec, vadimp, system-sw-low-level, robh+dt,
openocd-devel-owner, linux-api, davem, mchehab, Oleksandr Shamray
When a need raise up to use JTAG interface for system's devices
programming or CPU debugging, usually the user layer
application implements jtag protocol by bit-bang or using a
proprietary connection to vendor hardware.
This method can be slow and not generic.
We propose to implement general JTAG interface and infrastructure
to communicate with user layer application. In such way, we can
have the standard JTAG interface core part and separation from
specific HW implementation.
This allow new capability to debug the CPU or program system's
device via BMC without additional devices nor cost.
This patch purpose is to add JTAG master core infrastructure by
defining new JTAG class and provide generic JTAG interface
to allow hardware specific drivers to connect this interface.
This will enable all JTAG drivers to use the common interface
part and will have separate for hardware implementation.
The JTAG (Joint Test Action Group) core driver provides minimal generic
JTAG interface, which can be used by hardware specific JTAG master
controllers. By providing common interface for the JTAG controllers,
user space device programing is hardware independent.
Modern SoC which in use for embedded system' equipped with
internal JTAG master interface.
This interface is used for programming and debugging system's
hardware components, like CPLD, FPGA, CPU, voltage and
industrial controllers.
Firmware for such devices can be upgraded through JTAG interface during
Runtime. The JTAG standard support for multiple devices programming,
is in case their lines are daisy-chained together.
For example, systems which equipped with host CPU, BMC SoC or/and
number of programmable devices are capable to connect a pin and
select system components dynamically for programming and debugging,
This is using by the BMC which is equipped with internal SoC master
controller.
For example:
BMC JTAG master --> pin selected to CPLDs chain for programming (filed
upgrade, production)
BMC JTAG master --> pin selected to voltage monitors for programming
(field upgrade, production)
BMC JTAG master --> pin selected to host CPU (on-site debugging
and developers debugging)
For example, we can have application in user space which using calls
to JTAG driver executes CPLD programming directly from SVF file
The JTAG standard (IEEE 1149.1) defines the next connector pins:
- TDI (Test Data In);
- TDO (Test Data Out);
- TCK (Test Clock);
- TMS (Test Mode Select);
- TRST (Test Reset) (Optional);
The SoC equipped with JTAG master controller, performs
device programming on command or vector level. For example
a file in a standard SVF (Serial Vector Format) that contains
boundary scan vectors, can be used by sending each vector
to the JTAG interface and the JTAG controller will execute
the programming.
Initial version provides the system calls set for:
- SIR (Scan Instruction Register, IEEE 1149.1 Data Register scan);
- SDR (Scan Data Register, IEEE 1149.1 Instruction Register scan);
- RUNTEST (Forces the IEEE 1149.1 bus to a run state for a specified
number of clocks.
SoC which are not equipped with JTAG master interface, can be built
on top of JTAG core driver infrastructure, by applying bit-banging of
TDI, TDO, TCK and TMS pins within the hardware specific driver.
Oleksandr Shamray (4):
drivers: jtag: Add JTAG core driver
drivers: jtag: Add Aspeed SoC 24xx and 25xx families JTAG master
driver
Documentation: jtag: Add bindings for Aspeed SoC 24xx and 25xx
families JTAG master driver
Documentation: jtag: Add ABI documentation
Documentation/ABI/testing/jatg-cdev | 27 +
.../devicetree/bindings/jtag/aspeed-jtag.txt | 18 +
Documentation/ioctl/ioctl-number.txt | 2 +
MAINTAINERS | 10 +
drivers/Kconfig | 2 +
drivers/Makefile | 1 +
drivers/jtag/Kconfig | 29 +
drivers/jtag/Makefile | 2 +
drivers/jtag/jtag-aspeed.c | 770 ++++++++++++++++++++
drivers/jtag/jtag.c | 312 ++++++++
include/linux/jtag.h | 48 ++
include/uapi/linux/jtag.h | 111 +++
12 files changed, 1332 insertions(+), 0 deletions(-)
create mode 100644 Documentation/ABI/testing/jatg-cdev
create mode 100644 Documentation/devicetree/bindings/jtag/aspeed-jtag.txt
create mode 100644 drivers/jtag/Kconfig
create mode 100644 drivers/jtag/Makefile
create mode 100644 drivers/jtag/jtag-aspeed.c
create mode 100644 drivers/jtag/jtag.c
create mode 100644 include/linux/jtag.h
create mode 100644 include/uapi/linux/jtag.h
^ permalink raw reply
* Re: [PATCH v1 07/10] iio:adc:at91-sama5d2: Support backup mode
From: Nicolas Ferre @ 2017-09-08 16:03 UTC (permalink / raw)
To: Romain Izard, Boris Brezillon, Michael Turquette, Stephen Boyd,
Ludovic Desroches, Jonathan Cameron, Wenyou Yang, Josh Wu,
David Woodhouse, Brian Norris, Marek Vasut, Cyrille Pitchen,
Thierry Reding, Richard Genoud, Greg Kroah-Hartman, Alan Stern,
Eugen Hristev
Cc: linux-clk-u79uwXL29TY76Z2rM5mHXA,
linux-kernel-u79uwXL29TY76Z2rM5mHXA,
linux-iio-u79uwXL29TY76Z2rM5mHXA,
linux-mtd-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
linux-pwm-u79uwXL29TY76Z2rM5mHXA,
linux-serial-u79uwXL29TY76Z2rM5mHXA,
linux-usb-u79uwXL29TY76Z2rM5mHXA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r
In-Reply-To: <20170908153604.28383-8-romain.izard.pro-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
On 08/09/2017 at 17:36, Romain Izard wrote:
> Support the backup mode for platform suspend, by restoring the hardware
> registers on resume.
>
> Signed-off-by: Romain Izard <romain.izard.pro-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Romain,
Thanks for your series: definitively some of your patches need to be
integrated (I've merged some of them in our current linux-4.9-at91 branch.
However, It seems that some of your additions have already been
submitted and/or accepted by maintainers.
For instance an equivalent of this one seems already in Linus' tree:
500a2eefd6b16ba141a8fb777ea6962d2eb65e3b ("iio: adc: at91-sama5d2_adc:
add support for suspend/resume functionality").
Please tell us if it fits what your observed on this driver (or others).
Regards,
> ---
> drivers/iio/adc/at91-sama5d2_adc.c | 71 ++++++++++++++++++++++++++++++++------
> 1 file changed, 61 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c
> index e10dca3ed74b..f9718c863363 100644
> --- a/drivers/iio/adc/at91-sama5d2_adc.c
> +++ b/drivers/iio/adc/at91-sama5d2_adc.c
> @@ -200,6 +200,7 @@ struct at91_adc_state {
> u32 conversion_value;
> struct at91_adc_soc_info soc_info;
> wait_queue_head_t wq_data_available;
> + unsigned int current_rate;
> /*
> * lock to prevent concurrent 'single conversion' requests through
> * sysfs.
> @@ -269,6 +270,8 @@ static void at91_adc_setup_samp_freq(struct at91_adc_state *st, unsigned freq)
> mr |= AT91_SAMA5D2_MR_PRESCAL(prescal);
> at91_adc_writel(st, AT91_SAMA5D2_MR, mr);
>
> + st->current_rate = freq;
> +
> dev_dbg(&indio_dev->dev, "freq: %u, startup: %u, prescal: %u\n",
> freq, startup, prescal);
> }
> @@ -375,7 +378,9 @@ static int at91_adc_write_raw(struct iio_dev *indio_dev,
> val > st->soc_info.max_sample_rate)
> return -EINVAL;
>
> + mutex_lock(&st->lock);
> at91_adc_setup_samp_freq(st, val);
> + mutex_unlock(&st->lock);
>
> return 0;
> }
> @@ -386,6 +391,21 @@ static const struct iio_info at91_adc_info = {
> .driver_module = THIS_MODULE,
> };
>
> +static void at91_adc_init_hw(struct at91_adc_state *st, unsigned int freq)
> +{
> + at91_adc_writel(st, AT91_SAMA5D2_CR, AT91_SAMA5D2_CR_SWRST);
> + at91_adc_writel(st, AT91_SAMA5D2_IDR, 0xffffffff);
> + /*
> + * Transfer field must be set to 2 according to the datasheet and
> + * allows different analog settings for each channel.
> + */
> + at91_adc_writel(st, AT91_SAMA5D2_MR,
> + AT91_SAMA5D2_MR_TRANSFER(2) | AT91_SAMA5D2_MR_ANACH);
> +
> + at91_adc_setup_samp_freq(st, freq);
> +
> +}
> +
> static int at91_adc_probe(struct platform_device *pdev)
> {
> struct iio_dev *indio_dev;
> @@ -482,16 +502,7 @@ static int at91_adc_probe(struct platform_device *pdev)
> goto vref_disable;
> }
>
> - at91_adc_writel(st, AT91_SAMA5D2_CR, AT91_SAMA5D2_CR_SWRST);
> - at91_adc_writel(st, AT91_SAMA5D2_IDR, 0xffffffff);
> - /*
> - * Transfer field must be set to 2 according to the datasheet and
> - * allows different analog settings for each channel.
> - */
> - at91_adc_writel(st, AT91_SAMA5D2_MR,
> - AT91_SAMA5D2_MR_TRANSFER(2) | AT91_SAMA5D2_MR_ANACH);
> -
> - at91_adc_setup_samp_freq(st, st->soc_info.min_sample_rate);
> + at91_adc_init_hw(st, st->soc_info.min_sample_rate);
>
> ret = clk_prepare_enable(st->per_clk);
> if (ret)
> @@ -541,12 +552,52 @@ static const struct of_device_id at91_adc_dt_match[] = {
> };
> MODULE_DEVICE_TABLE(of, at91_adc_dt_match);
>
> +#ifdef CONFIG_PM_SLEEP
> +static int at91_adc_suspend(struct device *dev)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct iio_dev *indio_dev = platform_get_drvdata(pdev);
> + struct at91_adc_state *st = iio_priv(indio_dev);
> +
> + clk_disable_unprepare(st->per_clk);
> +
> + regulator_disable(st->vref);
> + regulator_disable(st->reg);
> +
> + return 0;
> +}
> +
> +static int at91_adc_resume(struct device *dev)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct iio_dev *indio_dev = platform_get_drvdata(pdev);
> + struct at91_adc_state *st = iio_priv(indio_dev);
> + int err;
> +
> + err = regulator_enable(st->reg);
> + if (err)
> + return err;
> +
> + err = regulator_enable(st->vref);
> + if (err)
> + return err;
> +
> + at91_adc_init_hw(st, st->current_rate);
> +
> + err = clk_prepare_enable(st->per_clk);
> + return err;
> +}
> +#endif
> +
> +static SIMPLE_DEV_PM_OPS(at91_adc_pm_ops, at91_adc_suspend, at91_adc_resume);
> +
> static struct platform_driver at91_adc_driver = {
> .probe = at91_adc_probe,
> .remove = at91_adc_remove,
> .driver = {
> .name = "at91-sama5d2_adc",
> .of_match_table = at91_adc_dt_match,
> + .pm = &at91_adc_pm_ops,
> },
> };
> module_platform_driver(at91_adc_driver)
>
--
Nicolas Ferre
^ permalink raw reply
* [PATCH v1 10/10] tty/serial: atmel: Prevent a warning on suspend
From: Romain Izard @ 2017-09-08 15:36 UTC (permalink / raw)
To: Nicolas Ferre, Boris Brezillon, Michael Turquette, Stephen Boyd,
Ludovic Desroches, Jonathan Cameron, Wenyou Yang, Josh Wu,
David Woodhouse, Brian Norris, Marek Vasut, Cyrille Pitchen,
Thierry Reding, Richard Genoud, Greg Kroah-Hartman, Alan Stern
Cc: linux-clk-u79uwXL29TY76Z2rM5mHXA,
linux-kernel-u79uwXL29TY76Z2rM5mHXA,
linux-iio-u79uwXL29TY76Z2rM5mHXA,
linux-mtd-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
linux-pwm-u79uwXL29TY76Z2rM5mHXA,
linux-serial-u79uwXL29TY76Z2rM5mHXA,
linux-usb-u79uwXL29TY76Z2rM5mHXA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r, Romain Izard
In-Reply-To: <20170908153604.28383-1-romain.izard.pro-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
The atmel serial port driver reported the following warning on suspend:
atmel_usart f8020000.serial: ttyS1: Unable to drain transmitter
As the ATMEL_US_TXEMPTY status bit in ATMEL_US_CSR is always cleared
when the transmitter is disabled, we need to know the transmitter's
state to return the real fifo state. And as ATMEL_US_CR is write-only,
it is necessary to save the state of the transmitter in a local
variable, and update the variable when TXEN and TXDIS is written in
ATMEL_US_CR.
After those changes, atmel_tx_empty can return "empty" on suspend, the
warning in uart_suspend_port disappears, and suspending is 20ms shorter
for each enabled Atmel serial port.
Signed-off-by: Romain Izard <romain.izard.pro-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
drivers/tty/serial/atmel_serial.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 7551cab438ff..195c0d1b594e 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -171,6 +171,7 @@ struct atmel_uart_port {
bool has_hw_timer;
struct timer_list uart_timer;
+ bool tx_stopped;
bool suspended;
unsigned int pending;
unsigned int pending_status;
@@ -380,6 +381,10 @@ static int atmel_config_rs485(struct uart_port *port,
*/
static u_int atmel_tx_empty(struct uart_port *port)
{
+ struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+
+ if (atmel_port->tx_stopped)
+ return TIOCSER_TEMT;
return (atmel_uart_readl(port, ATMEL_US_CSR) & ATMEL_US_TXEMPTY) ?
TIOCSER_TEMT :
0;
@@ -485,6 +490,7 @@ static void atmel_stop_tx(struct uart_port *port)
* is fully transmitted.
*/
atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_TXDIS);
+ atmel_port->tx_stopped = true;
/* Disable interrupts */
atmel_uart_writel(port, ATMEL_US_IDR, atmel_port->tx_done_mask);
@@ -492,6 +498,7 @@ static void atmel_stop_tx(struct uart_port *port)
if ((port->rs485.flags & SER_RS485_ENABLED) &&
!(port->rs485.flags & SER_RS485_RX_DURING_TX))
atmel_start_rx(port);
+
}
/*
@@ -521,6 +528,7 @@ static void atmel_start_tx(struct uart_port *port)
/* re-enable the transmitter */
atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_TXEN);
+ atmel_port->tx_stopped = false;
}
/*
@@ -1866,6 +1874,7 @@ static int atmel_startup(struct uart_port *port)
atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_RSTSTA | ATMEL_US_RSTRX);
/* enable xmit & rcvr */
atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_TXEN | ATMEL_US_RXEN);
+ atmel_port->tx_stopped = false;
setup_timer(&atmel_port->uart_timer,
atmel_uart_timer_callback,
@@ -2122,6 +2131,7 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios *termios,
/* disable receiver and transmitter */
atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_TXDIS | ATMEL_US_RXDIS);
+ atmel_port->tx_stopped = true;
/* mode */
if (port->rs485.flags & SER_RS485_ENABLED) {
@@ -2207,6 +2217,7 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios *termios,
atmel_uart_writel(port, ATMEL_US_BRGR, quot);
atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_RSTSTA | ATMEL_US_RSTRX);
atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_TXEN | ATMEL_US_RXEN);
+ atmel_port->tx_stopped = false;
/* restore interrupts */
atmel_uart_writel(port, ATMEL_US_IER, imr);
@@ -2450,6 +2461,7 @@ static void atmel_console_write(struct console *co, const char *s, u_int count)
/* Make sure that tx path is actually able to send characters */
atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_TXEN);
+ atmel_port->tx_stopped = false;
uart_console_write(port, s, count, atmel_console_putchar);
@@ -2528,6 +2540,7 @@ static int __init atmel_console_setup(struct console *co, char *options)
atmel_uart_writel(port, ATMEL_US_IDR, -1);
atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_RSTSTA | ATMEL_US_RSTRX);
atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_TXEN | ATMEL_US_RXEN);
+ atmel_port->tx_stopped = false;
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
--
2.11.0
^ permalink raw reply related
* [PATCH v1 09/10] atmel_flexcom: Support backup mode
From: Romain Izard @ 2017-09-08 15:36 UTC (permalink / raw)
To: Nicolas Ferre, Boris Brezillon, Michael Turquette, Stephen Boyd,
Ludovic Desroches, Jonathan Cameron, Wenyou Yang, Josh Wu,
David Woodhouse, Brian Norris, Marek Vasut, Cyrille Pitchen,
Thierry Reding, Richard Genoud, Greg Kroah-Hartman, Alan Stern
Cc: linux-clk, linux-kernel, linux-iio, linux-mtd, linux-pwm,
linux-serial, linux-usb, linux-arm-kernel, Romain Izard
In-Reply-To: <20170908153604.28383-1-romain.izard.pro@gmail.com>
The controller used by a flexcom module is configured at boot, and left
alone after this. As the configuration will be lost after backup mode,
restore the state of the flexcom driver on resume.
Signed-off-by: Romain Izard <romain.izard.pro@gmail.com>
---
drivers/mfd/atmel-flexcom.c | 65 ++++++++++++++++++++++++++++++++++-----------
1 file changed, 50 insertions(+), 15 deletions(-)
diff --git a/drivers/mfd/atmel-flexcom.c b/drivers/mfd/atmel-flexcom.c
index 064bde9cff5a..ef1235c4a179 100644
--- a/drivers/mfd/atmel-flexcom.c
+++ b/drivers/mfd/atmel-flexcom.c
@@ -39,34 +39,44 @@
#define FLEX_MR_OPMODE(opmode) (((opmode) << FLEX_MR_OPMODE_OFFSET) & \
FLEX_MR_OPMODE_MASK)
+struct atmel_flexcom {
+ void __iomem *base;
+ u32 opmode;
+ struct clk *clk;
+};
static int atmel_flexcom_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
- struct clk *clk;
struct resource *res;
- void __iomem *base;
- u32 opmode;
+ struct atmel_flexcom *afc;
int err;
+ u32 val;
+
+ afc = devm_kzalloc(&pdev->dev, sizeof(*afc), GFP_KERNEL);
+ if (!afc)
+ return -ENOMEM;
- err = of_property_read_u32(np, "atmel,flexcom-mode", &opmode);
+ platform_set_drvdata(pdev, afc);
+
+ err = of_property_read_u32(np, "atmel,flexcom-mode", &afc->opmode);
if (err)
return err;
- if (opmode < ATMEL_FLEXCOM_MODE_USART ||
- opmode > ATMEL_FLEXCOM_MODE_TWI)
+ if (afc->opmode < ATMEL_FLEXCOM_MODE_USART ||
+ afc->opmode > ATMEL_FLEXCOM_MODE_TWI)
return -EINVAL;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- base = devm_ioremap_resource(&pdev->dev, res);
- if (IS_ERR(base))
- return PTR_ERR(base);
+ afc->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(afc->base))
+ return PTR_ERR(afc->base);
- clk = devm_clk_get(&pdev->dev, NULL);
- if (IS_ERR(clk))
- return PTR_ERR(clk);
+ afc->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(afc->clk))
+ return PTR_ERR(afc->clk);
- err = clk_prepare_enable(clk);
+ err = clk_prepare_enable(afc->clk);
if (err)
return err;
@@ -76,9 +86,10 @@ static int atmel_flexcom_probe(struct platform_device *pdev)
* inaccessible and are read as zero. Also the external I/O lines of the
* Flexcom are muxed to reach the selected device.
*/
- writel(FLEX_MR_OPMODE(opmode), base + FLEX_MR);
+ val = FLEX_MR_OPMODE(afc->opmode);
+ writel(val, afc->base + FLEX_MR);
- clk_disable_unprepare(clk);
+ clk_disable_unprepare(afc->clk);
return devm_of_platform_populate(&pdev->dev);
}
@@ -89,10 +100,34 @@ static const struct of_device_id atmel_flexcom_of_match[] = {
};
MODULE_DEVICE_TABLE(of, atmel_flexcom_of_match);
+#ifdef CONFIG_PM_SLEEP
+static int atmel_flexcom_resume(struct device *dev)
+{
+ struct atmel_flexcom *afc = dev_get_drvdata(dev);
+ int err;
+ u32 val;
+
+ err = clk_prepare_enable(afc->clk);
+ if (err)
+ return err;
+
+ val = FLEX_MR_OPMODE(afc->opmode),
+ writel(val, afc->base + FLEX_MR);
+
+ clk_disable_unprepare(afc->clk);
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(atmel_flexcom_pm_ops, NULL,
+ atmel_flexcom_resume);
+
static struct platform_driver atmel_flexcom_driver = {
.probe = atmel_flexcom_probe,
.driver = {
.name = "atmel_flexcom",
+ .pm = &atmel_flexcom_pm_ops,
.of_match_table = atmel_flexcom_of_match,
},
};
--
2.11.0
^ permalink raw reply related
* [PATCH v1 08/10] pwm: atmel-tcb: Support backup mode
From: Romain Izard @ 2017-09-08 15:36 UTC (permalink / raw)
To: Nicolas Ferre, Boris Brezillon, Michael Turquette, Stephen Boyd,
Ludovic Desroches, Jonathan Cameron, Wenyou Yang, Josh Wu,
David Woodhouse, Brian Norris, Marek Vasut, Cyrille Pitchen,
Thierry Reding, Richard Genoud, Greg Kroah-Hartman, Alan Stern
Cc: linux-clk-u79uwXL29TY76Z2rM5mHXA,
linux-kernel-u79uwXL29TY76Z2rM5mHXA,
linux-iio-u79uwXL29TY76Z2rM5mHXA,
linux-mtd-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
linux-pwm-u79uwXL29TY76Z2rM5mHXA,
linux-serial-u79uwXL29TY76Z2rM5mHXA,
linux-usb-u79uwXL29TY76Z2rM5mHXA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r, Romain Izard
In-Reply-To: <20170908153604.28383-1-romain.izard.pro-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Save and restore registers for the PWM on suspend and resume, which
makes hibernation and backup modes possible.
Signed-off-by: Romain Izard <romain.izard.pro-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
drivers/pwm/pwm-atmel-tcb.c | 63 +++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 61 insertions(+), 2 deletions(-)
diff --git a/drivers/pwm/pwm-atmel-tcb.c b/drivers/pwm/pwm-atmel-tcb.c
index 75db585a2a94..acd3ce8ecf3f 100644
--- a/drivers/pwm/pwm-atmel-tcb.c
+++ b/drivers/pwm/pwm-atmel-tcb.c
@@ -37,11 +37,20 @@ struct atmel_tcb_pwm_device {
unsigned period; /* PWM period expressed in clk cycles */
};
+struct atmel_tcb_channel {
+ u32 enabled;
+ u32 cmr;
+ u32 ra;
+ u32 rb;
+ u32 rc;
+};
+
struct atmel_tcb_pwm_chip {
struct pwm_chip chip;
spinlock_t lock;
struct atmel_tc *tc;
struct atmel_tcb_pwm_device *pwms[NPWM];
+ struct atmel_tcb_channel bkup[NPWM / 2];
};
static inline struct atmel_tcb_pwm_chip *to_tcb_chip(struct pwm_chip *chip)
@@ -175,12 +184,15 @@ static void atmel_tcb_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
* Use software trigger to apply the new setting.
* If both PWM devices in this group are disabled we stop the clock.
*/
- if (!(cmr & (ATMEL_TC_ACPC | ATMEL_TC_BCPC)))
+ if (!(cmr & (ATMEL_TC_ACPC | ATMEL_TC_BCPC))) {
__raw_writel(ATMEL_TC_SWTRG | ATMEL_TC_CLKDIS,
regs + ATMEL_TC_REG(group, CCR));
- else
+ tcbpwmc->bkup[group].enabled = 1;
+ } else {
__raw_writel(ATMEL_TC_SWTRG, regs +
ATMEL_TC_REG(group, CCR));
+ tcbpwmc->bkup[group].enabled = 0;
+ }
spin_unlock(&tcbpwmc->lock);
}
@@ -263,6 +275,7 @@ static int atmel_tcb_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
/* Use software trigger to apply the new setting */
__raw_writel(ATMEL_TC_CLKEN | ATMEL_TC_SWTRG,
regs + ATMEL_TC_REG(group, CCR));
+ tcbpwmc->bkup[group].enabled = 1;
spin_unlock(&tcbpwmc->lock);
return 0;
}
@@ -445,10 +458,56 @@ static const struct of_device_id atmel_tcb_pwm_dt_ids[] = {
};
MODULE_DEVICE_TABLE(of, atmel_tcb_pwm_dt_ids);
+#ifdef CONFIG_PM_SLEEP
+static int atmel_tcb_pwm_suspend(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct atmel_tcb_pwm_chip *tcbpwm = platform_get_drvdata(pdev);
+ void __iomem *base = tcbpwm->tc->regs;
+ int i;
+
+ for (i = 0; i < (NPWM / 2); i++) {
+ struct atmel_tcb_channel *chan = &tcbpwm->bkup[i];
+
+ chan->cmr = readl(base + ATMEL_TC_REG(i, CMR));
+ chan->ra = readl(base + ATMEL_TC_REG(i, RA));
+ chan->rb = readl(base + ATMEL_TC_REG(i, RB));
+ chan->rc = readl(base + ATMEL_TC_REG(i, RC));
+ }
+ return 0;
+}
+
+static int atmel_tcb_pwm_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct atmel_tcb_pwm_chip *tcbpwm = platform_get_drvdata(pdev);
+ void __iomem *base = tcbpwm->tc->regs;
+ int i;
+
+ for (i = 0; i < (NPWM / 2); i++) {
+ struct atmel_tcb_channel *chan = &tcbpwm->bkup[i];
+
+ writel(chan->cmr, base + ATMEL_TC_REG(i, CMR));
+ writel(chan->ra, base + ATMEL_TC_REG(i, RA));
+ writel(chan->rb, base + ATMEL_TC_REG(i, RB));
+ writel(chan->rc, base + ATMEL_TC_REG(i, RC));
+ if (chan->enabled) {
+ writel(ATMEL_TC_CLKEN | ATMEL_TC_SWTRG,
+ base + ATMEL_TC_REG(i, CCR));
+ }
+ }
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(atmel_tcb_pwm_pm_ops, atmel_tcb_pwm_suspend,
+ atmel_tcb_pwm_resume);
+
static struct platform_driver atmel_tcb_pwm_driver = {
.driver = {
.name = "atmel-tcb-pwm",
.of_match_table = atmel_tcb_pwm_dt_ids,
+ .pm = &atmel_tcb_pwm_pm_ops,
},
.probe = atmel_tcb_pwm_probe,
.remove = atmel_tcb_pwm_remove,
--
2.11.0
--
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^ permalink raw reply related
* [PATCH v1 07/10] iio:adc:at91-sama5d2: Support backup mode
From: Romain Izard @ 2017-09-08 15:36 UTC (permalink / raw)
To: Nicolas Ferre, Boris Brezillon, Michael Turquette, Stephen Boyd,
Ludovic Desroches, Jonathan Cameron, Wenyou Yang, Josh Wu,
David Woodhouse, Brian Norris, Marek Vasut, Cyrille Pitchen,
Thierry Reding, Richard Genoud, Greg Kroah-Hartman, Alan Stern
Cc: linux-clk, linux-kernel, linux-iio, linux-mtd, linux-pwm,
linux-serial, linux-usb, linux-arm-kernel, Romain Izard
In-Reply-To: <20170908153604.28383-1-romain.izard.pro@gmail.com>
Support the backup mode for platform suspend, by restoring the hardware
registers on resume.
Signed-off-by: Romain Izard <romain.izard.pro@gmail.com>
---
drivers/iio/adc/at91-sama5d2_adc.c | 71 ++++++++++++++++++++++++++++++++------
1 file changed, 61 insertions(+), 10 deletions(-)
diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c
index e10dca3ed74b..f9718c863363 100644
--- a/drivers/iio/adc/at91-sama5d2_adc.c
+++ b/drivers/iio/adc/at91-sama5d2_adc.c
@@ -200,6 +200,7 @@ struct at91_adc_state {
u32 conversion_value;
struct at91_adc_soc_info soc_info;
wait_queue_head_t wq_data_available;
+ unsigned int current_rate;
/*
* lock to prevent concurrent 'single conversion' requests through
* sysfs.
@@ -269,6 +270,8 @@ static void at91_adc_setup_samp_freq(struct at91_adc_state *st, unsigned freq)
mr |= AT91_SAMA5D2_MR_PRESCAL(prescal);
at91_adc_writel(st, AT91_SAMA5D2_MR, mr);
+ st->current_rate = freq;
+
dev_dbg(&indio_dev->dev, "freq: %u, startup: %u, prescal: %u\n",
freq, startup, prescal);
}
@@ -375,7 +378,9 @@ static int at91_adc_write_raw(struct iio_dev *indio_dev,
val > st->soc_info.max_sample_rate)
return -EINVAL;
+ mutex_lock(&st->lock);
at91_adc_setup_samp_freq(st, val);
+ mutex_unlock(&st->lock);
return 0;
}
@@ -386,6 +391,21 @@ static const struct iio_info at91_adc_info = {
.driver_module = THIS_MODULE,
};
+static void at91_adc_init_hw(struct at91_adc_state *st, unsigned int freq)
+{
+ at91_adc_writel(st, AT91_SAMA5D2_CR, AT91_SAMA5D2_CR_SWRST);
+ at91_adc_writel(st, AT91_SAMA5D2_IDR, 0xffffffff);
+ /*
+ * Transfer field must be set to 2 according to the datasheet and
+ * allows different analog settings for each channel.
+ */
+ at91_adc_writel(st, AT91_SAMA5D2_MR,
+ AT91_SAMA5D2_MR_TRANSFER(2) | AT91_SAMA5D2_MR_ANACH);
+
+ at91_adc_setup_samp_freq(st, freq);
+
+}
+
static int at91_adc_probe(struct platform_device *pdev)
{
struct iio_dev *indio_dev;
@@ -482,16 +502,7 @@ static int at91_adc_probe(struct platform_device *pdev)
goto vref_disable;
}
- at91_adc_writel(st, AT91_SAMA5D2_CR, AT91_SAMA5D2_CR_SWRST);
- at91_adc_writel(st, AT91_SAMA5D2_IDR, 0xffffffff);
- /*
- * Transfer field must be set to 2 according to the datasheet and
- * allows different analog settings for each channel.
- */
- at91_adc_writel(st, AT91_SAMA5D2_MR,
- AT91_SAMA5D2_MR_TRANSFER(2) | AT91_SAMA5D2_MR_ANACH);
-
- at91_adc_setup_samp_freq(st, st->soc_info.min_sample_rate);
+ at91_adc_init_hw(st, st->soc_info.min_sample_rate);
ret = clk_prepare_enable(st->per_clk);
if (ret)
@@ -541,12 +552,52 @@ static const struct of_device_id at91_adc_dt_match[] = {
};
MODULE_DEVICE_TABLE(of, at91_adc_dt_match);
+#ifdef CONFIG_PM_SLEEP
+static int at91_adc_suspend(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+ struct at91_adc_state *st = iio_priv(indio_dev);
+
+ clk_disable_unprepare(st->per_clk);
+
+ regulator_disable(st->vref);
+ regulator_disable(st->reg);
+
+ return 0;
+}
+
+static int at91_adc_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+ struct at91_adc_state *st = iio_priv(indio_dev);
+ int err;
+
+ err = regulator_enable(st->reg);
+ if (err)
+ return err;
+
+ err = regulator_enable(st->vref);
+ if (err)
+ return err;
+
+ at91_adc_init_hw(st, st->current_rate);
+
+ err = clk_prepare_enable(st->per_clk);
+ return err;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(at91_adc_pm_ops, at91_adc_suspend, at91_adc_resume);
+
static struct platform_driver at91_adc_driver = {
.probe = at91_adc_probe,
.remove = at91_adc_remove,
.driver = {
.name = "at91-sama5d2_adc",
.of_match_table = at91_adc_dt_match,
+ .pm = &at91_adc_pm_ops,
},
};
module_platform_driver(at91_adc_driver)
--
2.11.0
^ permalink raw reply related
* [PATCH v1 06/10] ehci-atmel: Power down during suspend is normal
From: Romain Izard @ 2017-09-08 15:36 UTC (permalink / raw)
To: Nicolas Ferre, Boris Brezillon, Michael Turquette, Stephen Boyd,
Ludovic Desroches, Jonathan Cameron, Wenyou Yang, Josh Wu,
David Woodhouse, Brian Norris, Marek Vasut, Cyrille Pitchen,
Thierry Reding, Richard Genoud, Greg Kroah-Hartman, Alan Stern
Cc: linux-clk, linux-kernel, linux-iio, linux-mtd, linux-pwm,
linux-serial, linux-usb, linux-arm-kernel, Romain Izard
In-Reply-To: <20170908153604.28383-1-romain.izard.pro@gmail.com>
When an Atmel SoC is suspended with the backup mode, the USB bus will be
powered down. As this is expected, do not return an error to the driver
core when ehci_resume detects it.
Signed-off-by: Romain Izard <romain.izard.pro@gmail.com>
---
drivers/usb/host/ehci-atmel.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/host/ehci-atmel.c b/drivers/usb/host/ehci-atmel.c
index 7440722bfbf0..2a8b9bdc0e57 100644
--- a/drivers/usb/host/ehci-atmel.c
+++ b/drivers/usb/host/ehci-atmel.c
@@ -205,7 +205,8 @@ static int __maybe_unused ehci_atmel_drv_resume(struct device *dev)
struct atmel_ehci_priv *atmel_ehci = hcd_to_atmel_ehci_priv(hcd);
atmel_start_clock(atmel_ehci);
- return ehci_resume(hcd, false);
+ ehci_resume(hcd, false);
+ return 0;
}
#ifdef CONFIG_OF
--
2.11.0
^ permalink raw reply related
* [PATCH v1 05/10] mtd: nand: atmel: Report PMECC failures as errors
From: Romain Izard @ 2017-09-08 15:35 UTC (permalink / raw)
To: Nicolas Ferre, Boris Brezillon, Michael Turquette, Stephen Boyd,
Ludovic Desroches, Jonathan Cameron, Wenyou Yang, Josh Wu,
David Woodhouse, Brian Norris, Marek Vasut, Cyrille Pitchen,
Thierry Reding, Richard Genoud, Greg Kroah-Hartman, Alan Stern
Cc: linux-clk, linux-kernel, linux-iio, linux-mtd, linux-pwm,
linux-serial, linux-usb, linux-arm-kernel, Romain Izard
In-Reply-To: <20170908153604.28383-1-romain.izard.pro@gmail.com>
It is not normal for the PMECC to fail when trying to fix ECC errors.
Report these cases as errors.
Signed-off-by: Romain Izard <romain.izard.pro@gmail.com>
---
drivers/mtd/nand/atmel/pmecc.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/mtd/nand/atmel/pmecc.c b/drivers/mtd/nand/atmel/pmecc.c
index 8d1208f38025..2a23f1ff945f 100644
--- a/drivers/mtd/nand/atmel/pmecc.c
+++ b/drivers/mtd/nand/atmel/pmecc.c
@@ -687,6 +687,8 @@ static int atmel_pmecc_err_location(struct atmel_pmecc_user *user)
* Number of roots does not match the degree of smu
* unable to correct error.
*/
+ dev_err(pmecc->dev,
+ "PMECC: Impossible to calculate error location.\n");
return -EBADMSG;
}
@@ -729,7 +731,7 @@ int atmel_pmecc_correct_sector(struct atmel_pmecc_user *user, int sector,
ptr = ecc + byte - sectorsize;
area = "ECC";
} else {
- dev_dbg(pmecc->dev,
+ dev_err(pmecc->dev,
"Invalid errpos value (%d, max is %d)\n",
errpos, (sectorsize + eccbytes) * 8);
return -EINVAL;
--
2.11.0
^ permalink raw reply related
* [PATCH v1 04/10] mtd: nand: atmel: Avoid ECC errors when leaving backup mode
From: Romain Izard @ 2017-09-08 15:35 UTC (permalink / raw)
To: Nicolas Ferre, Boris Brezillon, Michael Turquette, Stephen Boyd,
Ludovic Desroches, Jonathan Cameron, Wenyou Yang, Josh Wu,
David Woodhouse, Brian Norris, Marek Vasut, Cyrille Pitchen,
Thierry Reding, Richard Genoud, Greg Kroah-Hartman, Alan Stern
Cc: linux-clk, linux-kernel, linux-iio, linux-mtd, linux-pwm,
linux-serial, linux-usb, linux-arm-kernel, Romain Izard
In-Reply-To: <20170908153604.28383-1-romain.izard.pro@gmail.com>
During backup mode, the contents of all registers will be cleared as the
SoC will be completely powered down. For a product that boots on NAND
Flash memory, the bootloader will obviously use the related controller
to read the Flash and correct any detected error in the memory, before
handling back control to the kernel's resuming entry point.
In normal devices, it is up to the driver's suspend/resume code to
restore the registers in a valid state. But the PMECC is not a regular
device in the driver model when used with the legacy device tree binding
for the Atmel NAND controller, and suspend/resume code is not called.
As in my case the bootloader leaves the PMECC controller in a programmed
state, and the controller is only reset at boot or after a NAND access,
the first NAND Flash access with the Atmel controller will report
uncorrectable ECC errors.
To avoid this, systematically reset the PMECC controller before using
it.
Signed-off-by: Romain Izard <romain.izard.pro@gmail.com>
---
drivers/mtd/nand/atmel/pmecc.c | 11 +++--------
1 file changed, 3 insertions(+), 8 deletions(-)
diff --git a/drivers/mtd/nand/atmel/pmecc.c b/drivers/mtd/nand/atmel/pmecc.c
index 8c210a5776bc..8d1208f38025 100644
--- a/drivers/mtd/nand/atmel/pmecc.c
+++ b/drivers/mtd/nand/atmel/pmecc.c
@@ -777,6 +777,9 @@ int atmel_pmecc_enable(struct atmel_pmecc_user *user, int op)
mutex_lock(&user->pmecc->lock);
+ writel(PMECC_CTRL_RST, pmecc->regs.base + ATMEL_PMECC_CTRL);
+ writel(PMECC_CTRL_DISABLE, pmecc->regs.base + ATMEL_PMECC_CTRL);
+
cfg = user->cache.cfg;
if (op == NAND_ECC_WRITE)
cfg |= PMECC_CFG_WRITE_OP;
@@ -797,10 +800,6 @@ EXPORT_SYMBOL_GPL(atmel_pmecc_enable);
void atmel_pmecc_disable(struct atmel_pmecc_user *user)
{
- struct atmel_pmecc *pmecc = user->pmecc;
-
- writel(PMECC_CTRL_RST, pmecc->regs.base + ATMEL_PMECC_CTRL);
- writel(PMECC_CTRL_DISABLE, pmecc->regs.base + ATMEL_PMECC_CTRL);
mutex_unlock(&user->pmecc->lock);
}
EXPORT_SYMBOL_GPL(atmel_pmecc_disable);
@@ -856,10 +855,6 @@ static struct atmel_pmecc *atmel_pmecc_create(struct platform_device *pdev,
/* Disable all interrupts before registering the PMECC handler. */
writel(0xffffffff, pmecc->regs.base + ATMEL_PMECC_IDR);
- /* Reset the ECC engine */
- writel(PMECC_CTRL_RST, pmecc->regs.base + ATMEL_PMECC_CTRL);
- writel(PMECC_CTRL_DISABLE, pmecc->regs.base + ATMEL_PMECC_CTRL);
-
return pmecc;
}
--
2.11.0
^ permalink raw reply related
* [PATCH v1 03/10] clk: at91: pmc: Support backup for programmable clocks
From: Romain Izard @ 2017-09-08 15:35 UTC (permalink / raw)
To: Nicolas Ferre, Boris Brezillon, Michael Turquette, Stephen Boyd,
Ludovic Desroches, Jonathan Cameron, Wenyou Yang, Josh Wu,
David Woodhouse, Brian Norris, Marek Vasut, Cyrille Pitchen,
Thierry Reding, Richard Genoud, Greg Kroah-Hartman, Alan Stern
Cc: linux-clk, linux-kernel, linux-iio, linux-mtd, linux-pwm,
linux-serial, linux-usb, linux-arm-kernel, Romain Izard,
Romain Izard
In-Reply-To: <20170908153604.28383-1-romain.izard.pro@gmail.com>
From: Romain Izard <romain.izard@mobile-devices.fr>
Save and restore the System Clock and Programmable Clock register for
the backup use case.
Signed-off-by: Romain Izard <romain.izard.pro@gmail.com>
---
drivers/clk/at91/pmc.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c
index 07dc2861ad3f..5421b03553ec 100644
--- a/drivers/clk/at91/pmc.c
+++ b/drivers/clk/at91/pmc.c
@@ -66,6 +66,7 @@ static struct
u32 pcr[PMC_MAX_IDS];
u32 audio_pll0;
u32 audio_pll1;
+ u32 pckr[3];
} pmc_cache;
void pmc_register_id(u8 id)
@@ -103,6 +104,8 @@ static int pmc_suspend(void)
regmap_read(pmcreg, AT91_PMC_PCR,
&pmc_cache.pcr[registered_ids[i]]);
}
+ for (i = 0; i < 3; i++)
+ regmap_read(pmcreg, AT91_PMC_PCKR(i), &pmc_cache.pckr[i]);
return 0;
}
@@ -143,6 +146,8 @@ static void pmc_resume(void)
pmc_cache.pcr[registered_ids[i]] |
AT91_PMC_PCR_CMD);
}
+ for (i = 0; i < 3; i++)
+ regmap_write(pmcreg, AT91_PMC_PCKR(i), pmc_cache.pckr[i]);
if (pmc_cache.uckr & AT91_PMC_UPLLEN)
mask |= AT91_PMC_LOCKU;
--
2.11.0
^ permalink raw reply related
* [PATCH v1 02/10] clk: at91: pmc: Save SCSR during suspend
From: Romain Izard @ 2017-09-08 15:35 UTC (permalink / raw)
To: Nicolas Ferre, Boris Brezillon, Michael Turquette, Stephen Boyd,
Ludovic Desroches, Jonathan Cameron, Wenyou Yang, Josh Wu,
David Woodhouse, Brian Norris, Marek Vasut, Cyrille Pitchen,
Thierry Reding, Richard Genoud, Greg Kroah-Hartman, Alan Stern
Cc: linux-pwm, linux-iio, linux-usb, linux-kernel, linux-mtd,
linux-serial, Romain Izard, linux-clk, linux-arm-kernel
In-Reply-To: <20170908153604.28383-1-romain.izard.pro@gmail.com>
The contents of the System Clock Status Register (SCSR) needs to be
restored into the System Clock Enable Register (SCER).
As the bootloader will restore some clocks by itself, the issue can be
missed as only the USB controller, the LCD controller, the Image Sensor
controller and the programmable clocks will be impacted.
Fix the obvious typo in the suspend/resume code, as the IMR register
does not need to be saved twice.
Signed-off-by: Romain Izard <romain.izard.pro@gmail.com>
---
drivers/clk/at91/pmc.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c
index 5c2b26de303e..07dc2861ad3f 100644
--- a/drivers/clk/at91/pmc.c
+++ b/drivers/clk/at91/pmc.c
@@ -86,7 +86,7 @@ static int pmc_suspend(void)
{
int i;
- regmap_read(pmcreg, AT91_PMC_IMR, &pmc_cache.scsr);
+ regmap_read(pmcreg, AT91_PMC_SCSR, &pmc_cache.scsr);
regmap_read(pmcreg, AT91_PMC_PCSR, &pmc_cache.pcsr0);
regmap_read(pmcreg, AT91_CKGR_UCKR, &pmc_cache.uckr);
regmap_read(pmcreg, AT91_CKGR_MOR, &pmc_cache.mor);
@@ -129,7 +129,7 @@ static void pmc_resume(void)
if (pmc_cache.pllar != tmp)
pr_warn("PLLAR was not configured properly by the firmware\n");
- regmap_write(pmcreg, AT91_PMC_IMR, pmc_cache.scsr);
+ regmap_write(pmcreg, AT91_PMC_SCER, pmc_cache.scsr);
regmap_write(pmcreg, AT91_PMC_PCER, pmc_cache.pcsr0);
regmap_write(pmcreg, AT91_CKGR_UCKR, pmc_cache.uckr);
regmap_write(pmcreg, AT91_CKGR_MOR, pmc_cache.mor);
--
2.11.0
______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/
^ permalink raw reply related
* [PATCH v1 01/10] clk: at91: pmc: Wait for clocks when resuming
From: Romain Izard @ 2017-09-08 15:35 UTC (permalink / raw)
To: Nicolas Ferre, Boris Brezillon, Michael Turquette, Stephen Boyd,
Ludovic Desroches, Jonathan Cameron, Wenyou Yang, Josh Wu,
David Woodhouse, Brian Norris, Marek Vasut, Cyrille Pitchen,
Thierry Reding, Richard Genoud, Greg Kroah-Hartman, Alan Stern
Cc: linux-clk, linux-kernel, linux-iio, linux-mtd, linux-pwm,
linux-serial, linux-usb, linux-arm-kernel, Romain Izard
In-Reply-To: <20170908153604.28383-1-romain.izard.pro@gmail.com>
Wait for the syncronization of all clocks when resuming, not only the
UPLL clock. Do not use regmap_read_poll_timeout, as it will call BUG()
when interrupts are masked, which is the case in here.
Signed-off-by: Romain Izard <romain.izard.pro@gmail.com>
---
drivers/clk/at91/pmc.c | 24 ++++++++++++++++--------
1 file changed, 16 insertions(+), 8 deletions(-)
diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c
index 775af473fe11..5c2b26de303e 100644
--- a/drivers/clk/at91/pmc.c
+++ b/drivers/clk/at91/pmc.c
@@ -107,10 +107,20 @@ static int pmc_suspend(void)
return 0;
}
+static bool pmc_ready(unsigned int mask)
+{
+ unsigned int status;
+
+ regmap_read(pmcreg, AT91_PMC_SR, &status);
+
+ return ((status & mask) == mask) ? 1 : 0;
+}
+
static void pmc_resume(void)
{
- int i, ret = 0;
+ int i;
u32 tmp;
+ u32 mask = AT91_PMC_MCKRDY | AT91_PMC_LOCKA;
regmap_read(pmcreg, AT91_PMC_MCKR, &tmp);
if (pmc_cache.mckr != tmp)
@@ -134,13 +144,11 @@ static void pmc_resume(void)
AT91_PMC_PCR_CMD);
}
- if (pmc_cache.uckr & AT91_PMC_UPLLEN) {
- ret = regmap_read_poll_timeout(pmcreg, AT91_PMC_SR, tmp,
- !(tmp & AT91_PMC_LOCKU),
- 10, 5000);
- if (ret)
- pr_crit("USB PLL didn't lock when resuming\n");
- }
+ if (pmc_cache.uckr & AT91_PMC_UPLLEN)
+ mask |= AT91_PMC_LOCKU;
+
+ while (!pmc_ready(mask))
+ cpu_relax();
}
static struct syscore_ops pmc_syscore_ops = {
--
2.11.0
^ permalink raw reply related
* [PATCH v1 00/10] Various patches for SAMA5D2 backup mode
From: Romain Izard @ 2017-09-08 15:35 UTC (permalink / raw)
To: Nicolas Ferre, Boris Brezillon, Michael Turquette, Stephen Boyd,
Ludovic Desroches, Jonathan Cameron, Wenyou Yang, Josh Wu,
David Woodhouse, Brian Norris, Marek Vasut, Cyrille Pitchen,
Thierry Reding, Richard Genoud, Greg Kroah-Hartman, Alan Stern
Cc: linux-clk, linux-kernel, linux-iio, linux-mtd, linux-pwm,
linux-serial, linux-usb, linux-arm-kernel, Romain Izard
While the core of the backup mode for SAMA5D2 has been integrated in
v4.13, it is far from complete. Individual controllers in the chip have
drivers that do not support the reset of the registers during suspend,
and they need to be adapted to handle it.
The first patch uses the clock wakeup code from the prototype backup
mode instead of the version integrated in the mainline, as the mainline
version is not stable. During a test loop with two-second backup
suspend, the mainline version will hang in less than one day, whereas
the prototype version has been running the same test for more than a
week without hanging.
Romain Izard (10):
clk: at91: pmc: Wait for clocks when resuming
clk: at91: pmc: Save SCSR during suspend
clk: at91: pmc: Support backup for programmable clocks
mtd: nand: atmel: Avoid ECC errors when leaving backup mode
mtd: nand: atmel: Report PMECC failures as errors
ehci-atmel: Power down during suspend is normal
iio:adc:at91-sama5d2: Support backup mode
pwm: atmel-tcb: Support backup mode
atmel_flexcom: Support backup mode
tty/serial: atmel: Prevent a warning on suspend
drivers/clk/at91/pmc.c | 33 ++++++++++++------
drivers/iio/adc/at91-sama5d2_adc.c | 71 ++++++++++++++++++++++++++++++++------
drivers/mfd/atmel-flexcom.c | 65 ++++++++++++++++++++++++++--------
drivers/mtd/nand/atmel/pmecc.c | 15 ++++----
drivers/pwm/pwm-atmel-tcb.c | 63 +++++++++++++++++++++++++++++++--
drivers/tty/serial/atmel_serial.c | 13 +++++++
drivers/usb/host/ehci-atmel.c | 3 +-
7 files changed, 216 insertions(+), 47 deletions(-)
--
2.11.0
^ permalink raw reply
* [PATCH 2/2] mxser: remove unused parameters
From: Jiri Slaby @ 2017-09-08 13:36 UTC (permalink / raw)
To: gregkh; +Cc: linux-serial, linux-kernel, Jiri Slaby
In-Reply-To: <20170908133651.30157-1-jslaby@suse.cz>
Remove
* pdev from mxser_initbrd
* old_termios from mxser_change_speed
as they are unused and update the callers.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
drivers/tty/mxser.c | 16 +++++++---------
1 file changed, 7 insertions(+), 9 deletions(-)
diff --git a/drivers/tty/mxser.c b/drivers/tty/mxser.c
index 6b5f0c796a31..a6c6aa003893 100644
--- a/drivers/tty/mxser.c
+++ b/drivers/tty/mxser.c
@@ -642,8 +642,7 @@ static int mxser_set_baud(struct tty_struct *tty, long newspd)
* This routine is called to set the UART divisor registers to match
* the specified baud rate for a serial port.
*/
-static int mxser_change_speed(struct tty_struct *tty,
- struct ktermios *old_termios)
+static int mxser_change_speed(struct tty_struct *tty)
{
struct mxser_port *info = tty->driver_data;
unsigned cflag, cval, fcr;
@@ -945,7 +944,7 @@ static int mxser_activate(struct tty_port *port, struct tty_struct *tty)
/*
* and set the speed of the serial port
*/
- mxser_change_speed(tty, NULL);
+ mxser_change_speed(tty);
spin_unlock_irqrestore(&info->slock, flags);
return 0;
@@ -1288,7 +1287,7 @@ static int mxser_set_serial_info(struct tty_struct *tty,
if (tty_port_initialized(port)) {
if (flags != (port->flags & ASYNC_SPD_MASK)) {
spin_lock_irqsave(&info->slock, sl_flags);
- mxser_change_speed(tty, NULL);
+ mxser_change_speed(tty);
spin_unlock_irqrestore(&info->slock, sl_flags);
}
} else {
@@ -1946,7 +1945,7 @@ static void mxser_set_termios(struct tty_struct *tty, struct ktermios *old_termi
unsigned long flags;
spin_lock_irqsave(&info->slock, flags);
- mxser_change_speed(tty, old_termios);
+ mxser_change_speed(tty);
spin_unlock_irqrestore(&info->slock, flags);
if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
@@ -2375,8 +2374,7 @@ static void mxser_release_ISA_res(struct mxser_board *brd)
mxser_release_vector(brd);
}
-static int mxser_initbrd(struct mxser_board *brd,
- struct pci_dev *pdev)
+static int mxser_initbrd(struct mxser_board *brd)
{
struct mxser_port *info;
unsigned int i;
@@ -2640,7 +2638,7 @@ static int mxser_probe(struct pci_dev *pdev,
}
/* mxser_initbrd will hook ISR. */
- retval = mxser_initbrd(brd, pdev);
+ retval = mxser_initbrd(brd);
if (retval)
goto err_rel3;
@@ -2746,7 +2744,7 @@ static int __init mxser_module_init(void)
brd->info->name, ioaddr[b]);
/* mxser_initbrd will hook ISR. */
- if (mxser_initbrd(brd, NULL) < 0) {
+ if (mxser_initbrd(brd) < 0) {
mxser_release_ISA_res(brd);
brd->info = NULL;
continue;
--
2.14.1
^ permalink raw reply related
* [PATCH 1/2] mxser: fix timeout calculation for low rates
From: Jiri Slaby @ 2017-09-08 13:36 UTC (permalink / raw)
To: gregkh; +Cc: linux-serial, linux-kernel, Jiri Slaby, Paul
Paul reported, that low rates like B300 make the driver to hang in
mxser_wait_until_sent. His debugging tackled the issue down to the
info->timeout computation in mxser_set_baud. Obviously, ints are used
there and they easily overflow with these low rates: B300 makes
info->timeout to be -373.
So switch all these types to unsigned as it ought to be. And use the u64
domain to perform the computation as in the worst case, we need 35 bits
to store the computed value (before division).
And use do_div not to break 32 bit kernels.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Paul <Paul@abelian.netcom.co.uk>
---
drivers/tty/mxser.c | 16 +++++++++++-----
1 file changed, 11 insertions(+), 5 deletions(-)
diff --git a/drivers/tty/mxser.c b/drivers/tty/mxser.c
index 816681d6ec98..6b5f0c796a31 100644
--- a/drivers/tty/mxser.c
+++ b/drivers/tty/mxser.c
@@ -246,11 +246,11 @@ struct mxser_port {
unsigned char err_shadow;
struct async_icount icount; /* kernel counters for 4 input interrupts */
- int timeout;
+ unsigned int timeout;
int read_status_mask;
int ignore_status_mask;
- int xmit_fifo_size;
+ unsigned int xmit_fifo_size;
int xmit_head;
int xmit_tail;
int xmit_cnt;
@@ -572,8 +572,9 @@ static void mxser_dtr_rts(struct tty_port *port, int on)
static int mxser_set_baud(struct tty_struct *tty, long newspd)
{
struct mxser_port *info = tty->driver_data;
- int quot = 0, baud;
+ unsigned int quot = 0, baud;
unsigned char cval;
+ u64 timeout;
if (!info->ioaddr)
return -1;
@@ -594,8 +595,13 @@ static int mxser_set_baud(struct tty_struct *tty, long newspd)
quot = 0;
}
- info->timeout = ((info->xmit_fifo_size * HZ * 10 * quot) / info->baud_base);
- info->timeout += HZ / 50; /* Add .02 seconds of slop */
+ /*
+ * worst case (128 * 1000 * 10 * 18432) needs 35 bits, so divide in the
+ * u64 domain
+ */
+ timeout = (u64)info->xmit_fifo_size * HZ * 10 * quot;
+ do_div(timeout, info->baud_base)
+ info->timeout = timeout + HZ / 50; /* Add .02 seconds of slop */
if (quot) {
info->MCR |= UART_MCR_DTR;
--
2.14.1
^ permalink raw reply related
* Re: [patch v7 3/4] Documentation: jtag: Add bindings for Aspeed SoC 24xx and 25xx families JTAG master driver
From: Joel Stanley @ 2017-09-08 3:41 UTC (permalink / raw)
To: Oleksandr Shamray
Cc: Greg KH, Arnd Bergmann, Linux Kernel Mailing List, Linux ARM,
devicetree, OpenBMC Maillist, jiri-rHqAuBHg3fBzbRFIqnYvSA,
Tobias Klauser, linux-serial-u79uwXL29TY76Z2rM5mHXA,
mec-WqBc5aa1uDFeoWH0uzbU5w, vadimp-45czdsxZ+A5DPfheJLI6IQ,
system-sw-low-level-VPRAkNaXOzVWk0Htik3J/w, Rob Herring,
openocd-devel-owner-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f,
linux-api-u79uwXL29TY76Z2rM5mHXA, David S . Miller,
mchehab-DgEjT+Ai2ygdnm+yROfE0A, Jiri Pirko
In-Reply-To: <1504281966-6199-4-git-send-email-oleksandrs-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
On Sat, Sep 2, 2017 at 1:36 AM, Oleksandr Shamray
<oleksandrs-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org> wrote:
> diff --git a/Documentation/devicetree/bindings/jtag/aspeed-jtag.txt b/Documentation/devicetree/bindings/jtag/aspeed-jtag.txt
> new file mode 100644
> index 0000000..f4ded49
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/jtag/aspeed-jtag.txt
> @@ -0,0 +1,18 @@
> +Aspeed JTAG driver for ast2400 and ast2500 SoC
> +
> +Required properties:
> +- compatible: Should be one of
> + - "aspeed,aspeed2400-jtag"
> + - "aspeed,aspeed2500-jtag"
Please use aspeed,ast2500-jtag and aspeed,ast2400-jtag.
Cheers,
Joel
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
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
* Re: [patch v7 2/4] drivers: jtag: Add Aspeed SoC 24xx and 25xx families JTAG master driver
From: Joel Stanley @ 2017-09-08 3:36 UTC (permalink / raw)
To: Oleksandr Shamray
Cc: Greg KH, Arnd Bergmann, Linux Kernel Mailing List, Linux ARM,
devicetree, OpenBMC Maillist, jiri, Tobias Klauser, linux-serial,
mec, vadimp, system-sw-low-level, Rob Herring,
openocd-devel-owner, linux-api, David S . Miller, mchehab,
Jiri Pirko
In-Reply-To: <1504281966-6199-3-git-send-email-oleksandrs@mellanox.com>
Hello Oleksandr,
On Sat, Sep 2, 2017 at 1:36 AM, Oleksandr Shamray
<oleksandrs@mellanox.com> wrote:
> Driver adds support of Aspeed 2500/2400 series SOC JTAG master controller.
Looks good. I have some small comments. The most important is the
compatible string.
> --- a/drivers/jtag/Kconfig
> +++ b/drivers/jtag/Kconfig
> @@ -14,3 +14,16 @@ menuconfig JTAG
>
> To compile this driver as a module, choose M here: the module will
> be called jtag.
> +
> +menuconfig JTAG_ASPEED
> + tristate "Aspeed SoC JTAG controller support"
> + depends on JTAG && HAS_IOMEM
You could add this if you want:
depends ARCH_ASPEED || COMPILE_TEST
> + ---help---
> + This provides a support for Aspeed JTAG device, equipped on
> + Aspeed SoC 24xx and 25xx families. Drivers allows programming
> + of hardware devices, connected to SoC through the JTAG interface.
> +
> +
> +static char *end_status_str[] = {"idle", "ir pause", "drpause"};
> +
> +static u32 aspeed_jtag_read(struct aspeed_jtag *aspeed_jtag, u32 reg)
> +{
> + return readl(aspeed_jtag->reg_base + reg);
> +}
> +
> +static void
> +aspeed_jtag_write(struct aspeed_jtag *aspeed_jtag, u32 val, u32 reg)
> +{
> + writel(val, aspeed_jtag->reg_base + reg);
> +}
> +
> +static int aspeed_jtag_freq_set(struct jtag *jtag, __u32 freq)
What's the __u32 for (the __ part)?
> +{
> + struct aspeed_jtag *aspeed_jtag = jtag_priv(jtag);
> + unsigned long apb_frq;
> + u32 tck_val;
> + u16 div;
> +
> + apb_frq = clk_get_rate(aspeed_jtag->pclk);
> + div = (apb_frq % freq == 0) ? (apb_frq / freq) - 1 : (apb_frq / freq);
> + tck_val = aspeed_jtag_read(aspeed_jtag, ASPEED_JTAG_TCK);
> + aspeed_jtag_write(aspeed_jtag,
> + (tck_val & ASPEED_JTAG_TCK_DIVISOR_MASK) | div,
> + ASPEED_JTAG_TCK);
> + return 0;
> +}
> +
> +static int aspeed_jtag_xfer(struct jtag *jtag, struct jtag_xfer *xfer)
> +{
> + static const char sm_update_shiftir[] = {1, 1, 0, 0};
> + static const char sm_update_shiftdr[] = {1, 0, 0};
> + static const char sm_pause_idle[] = {1, 1, 0};
> + static const char sm_pause_update[] = {1, 1};
Nit: I was confused by the char, perhaps u8?
> +int aspeed_jtag_init(struct platform_device *pdev,
> + struct aspeed_jtag *aspeed_jtag)
> +{
> + struct resource *res;
> + int err;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + aspeed_jtag->reg_base = devm_ioremap_resource(aspeed_jtag->dev, res);
> + if (IS_ERR(aspeed_jtag->reg_base)) {
> + err = -ENOMEM;
> + goto out_region;
Can you just return here?
> + }
> +
> + aspeed_jtag->pclk = devm_clk_get(aspeed_jtag->dev, NULL);
> + if (IS_ERR(aspeed_jtag->pclk)) {
> + dev_err(aspeed_jtag->dev, "devm_clk_get failed\n");
> + return PTR_ERR(aspeed_jtag->pclk);
> + }
> +
> + clk_prepare_enable(aspeed_jtag->pclk);
> +
> + aspeed_jtag->irq = platform_get_irq(pdev, 0);
> + if (aspeed_jtag->irq < 0) {
> + dev_err(aspeed_jtag->dev, "no irq specified\n");
> + err = -ENOENT;
> + goto out_region;
> + }
> +
> + /* Enable clock */
> + aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_CTL_ENG_EN |
> + ASPEED_JTAG_CTL_ENG_OUT_EN, ASPEED_JTAG_CTRL);
> + aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_SW_MODE_EN |
> + ASPEED_JTAG_SW_MODE_TDIO, ASPEED_JTAG_SW);
> +
> + err = devm_request_irq(aspeed_jtag->dev, aspeed_jtag->irq,
> + aspeed_jtag_interrupt, 0,
> + "aspeed-jtag", aspeed_jtag);
> + if (err) {
> + dev_err(aspeed_jtag->dev, "aspeed_jtag unable to get IRQ");
> + goto out_region;
> + }
Can we grab the IRQ before enabling the clock? If not, we should
disable the clock in the error path.
> + dev_dbg(&pdev->dev, "aspeed_jtag:IRQ %d.\n", aspeed_jtag->irq);
> +
> + aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_ISR_INST_PAUSE |
> + ASPEED_JTAG_ISR_INST_COMPLETE |
> + ASPEED_JTAG_ISR_DATA_PAUSE |
> + ASPEED_JTAG_ISR_DATA_COMPLETE |
> + ASPEED_JTAG_ISR_INST_PAUSE_EN |
> + ASPEED_JTAG_ISR_INST_COMPLETE_EN |
> + ASPEED_JTAG_ISR_DATA_PAUSE_EN |
> + ASPEED_JTAG_ISR_DATA_COMPLETE_EN,
> + ASPEED_JTAG_ISR);
> +
> + aspeed_jtag->flag = 0;
> + init_waitqueue_head(&aspeed_jtag->jtag_wq);
> + return 0;
> +
> +out_region:
> + release_mem_region(res->start, resource_size(res));
I don't think this is necessary.
> + return err;
> +}
> +
> +int aspeed_jtag_deinit(struct platform_device *pdev,
> + struct aspeed_jtag *aspeed_jtag)
> +{
> + aspeed_jtag_write(aspeed_jtag, 0, ASPEED_JTAG_ISR);
> + devm_free_irq(aspeed_jtag->dev, aspeed_jtag->irq, aspeed_jtag);
The IRQ freeing happen automatically thanks to devm.
> + /* Disabe clock */
Disable
> + aspeed_jtag_write(aspeed_jtag, 0, ASPEED_JTAG_CTRL);
> + clk_disable_unprepare(aspeed_jtag->pclk);
> + return 0;
> +}
> +
> +static const struct jtag_ops aspeed_jtag_ops = {
> + .freq_get = aspeed_jtag_freq_get,
> + .freq_set = aspeed_jtag_freq_set,
> + .status_get = aspeed_jtag_status_get,
> + .idle = aspeed_jtag_idle,
> + .xfer = aspeed_jtag_xfer
> +};
> +
> +static int aspeed_jtag_probe(struct platform_device *pdev)
> +{
> + struct aspeed_jtag *aspeed_jtag;
> + struct jtag *jtag;
> + int err;
> +
> + if (!of_device_is_compatible(pdev->dev.of_node, "aspeed,aspeed-jtag"))
> + return -ENOMEM;
> +
> + jtag = jtag_alloc(sizeof(*aspeed_jtag), &aspeed_jtag_ops);
> + if (!jtag)
> + return -ENODEV;
> +
> + platform_set_drvdata(pdev, jtag);
> + aspeed_jtag = jtag_priv(jtag);
> + aspeed_jtag->dev = &pdev->dev;
> +
> + /* Initialize device*/
> + err = aspeed_jtag_init(pdev, aspeed_jtag);
> + if (err)
> + goto err_jtag_init;
> +
> + /* Initialize JTAG core structure*/
> + err = jtag_register(jtag);
> + if (err)
> + goto err_jtag_register;
> +
> + return 0;
> +
> +err_jtag_register:
> + aspeed_jtag_deinit(pdev, aspeed_jtag);
> +err_jtag_init:
> + jtag_free(jtag);
> + return err;
> +}
> +
> +static int aspeed_jtag_remove(struct platform_device *pdev)
> +{
> + struct jtag *jtag;
> +
> + jtag = platform_get_drvdata(pdev);
> + aspeed_jtag_deinit(pdev, jtag_priv(jtag));
> + jtag_unregister(jtag);
> + jtag_free(jtag);
> + return 0;
> +}
> +
> +static const struct of_device_id aspeed_jtag_of_match[] = {
> + { .compatible = "aspeed,aspeed2400-jtag", },
> + { .compatible = "aspeed,aspeed2500-jtag", },
The convention is to use ast2500 for our compatible strings, so these should be:
aspeed,ast2500-jtag
aspeed,ast2400-jtag
Cheers,
Joel
^ permalink raw reply
* Re: [RFC 2/3] ACPI / scan: Fix enumeration for special UART devices
From: Lukas Wunner @ 2017-09-07 22:26 UTC (permalink / raw)
To: Frédéric Danis
Cc: robh, marcel, sre, loic.poulain, linux-bluetooth, linux-serial,
linux-acpi
In-Reply-To: <1504786214-1866-3-git-send-email-frederic.danis.oss@gmail.com>
On Thu, Sep 07, 2017 at 02:10:13PM +0200, Frédéric Danis wrote:
> --- a/drivers/acpi/scan.c
> +++ b/drivers/acpi/scan.c
> -static bool acpi_is_spi_i2c_slave(struct acpi_device *device)
> +static bool acpi_is_serial_slave(struct acpi_device *device)
> {
> struct list_head resource_list;
> - bool is_spi_i2c_slave = false;
> + bool is_serial_slave = false;
>
> INIT_LIST_HEAD(&resource_list);
> - acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
> - &is_spi_i2c_slave);
> + acpi_dev_get_resources(device, &resource_list, acpi_check_serial_slave,
> + &is_serial_slave);
> acpi_dev_free_resource_list(&resource_list);
>
> - return is_spi_i2c_slave;
> + return is_serial_slave;
> }
Commit ca9ef3ab68d3 ("ACPI / scan: Recognize Apple SPI and I2C slaves")
which landed in Linus' tree a few days ago changes the function above
to check for Apple device properties if running on an x86 Mac.
When rebasing, please amend the function to check for:
fwnode_property_present(&device->fwnode, "baud")
On Macs an empty ResourceTemplate is returned for uart slaves.
Instead the device properties "baud", "parity", "dataBits", "stopBits"
are provided. An excerpt of the DSDT on a MacBook8,1 is below.
An experimental patch for hci_bcm.c to take advantage of the baud
property is here, though I'm told it doesn't work yet (I don't have
such a machine myself to test):
https://github.com/l1k/linux/commit/8883d6225a92
Discussion on this patch is here:
https://github.com/Dunedan/mbp-2016-linux/issues/29
Thanks,
Lukas
-- cut here --
Scope (\_SB.PCI0.URT0)
{
Device (BLTH)
{
Name (_HID, EisaId ("BCM2E7C")) // _HID: Hardware ID
Name (_CID, "apple-uart-blth") // _CID: Compatible ID
Name (_UID, 0x01) // _UID: Unique ID
Name (_ADR, 0x00) // _ADR: Address
Method (_STA, 0, NotSerialized) // _STA: Status
{
Return (0x0F)
}
Method (_CRS, 0, NotSerialized) // _CRS: Current Resource Settings
{
Name (UBUF, ResourceTemplate ()
{
UartSerialBus (0x0001C200, DataBitsEight, StopBitsOne,
0xC0, LittleEndian, ParityTypeNone, FlowControlHardware,
0x0020, 0x0020, "\\_SB.PCI0.URT0",
0x00, ResourceProducer, ,
)
})
Name (ABUF, ResourceTemplate ()
{
})
If (LNot (OSDW ()))
{
Return (UBUF) /* \_SB_.PCI0.URT0.BLTH._CRS.UBUF */
}
Return (ABUF) /* \_SB_.PCI0.URT0.BLTH._CRS.ABUF */
}
Method (_DSM, 4, NotSerialized) // _DSM: Device-Specific Method
{
If (LEqual (Arg0, ToUUID ("a0b5b7c6-1318-441c-b0c9-fe695eaf949b")))
{
Store (Package (0x08)
{
"baud",
Buffer (0x08)
{
0xC0, 0xC6, 0x2D, 0x00, 0x00, 0x00, 0x00, 0x00 /* ..-..... */
},
"parity",
Buffer (0x08)
{
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 /* ........ */
},
"dataBits",
Buffer (0x08)
{
0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 /* ........ */
},
"stopBits",
Buffer (0x08)
{
0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 /* ........ */
}
}, Local0)
DTGP (Arg0, Arg1, Arg2, Arg3, RefOf (Local0))
Return (Local0)
}
Return (0x00)
}
^ permalink raw reply
* Re: [RFC 1/3] serdev: Add ACPI support
From: Rob Herring @ 2017-09-07 18:51 UTC (permalink / raw)
To: Marcel Holtmann
Cc: Frédéric Danis, Sebastian Reichel, Loic Poulain,
open list:BLUETOOTH DRIVERS, linux-serial@vger.kernel.org,
linux-acpi@vger.kernel.org
In-Reply-To: <9316EE4A-6FDF-4024-9709-E44824D26B4C@holtmann.org>
On Thu, Sep 7, 2017 at 12:57 PM, Marcel Holtmann <marcel@holtmann.org> wrote:
> Hi Rob,
>
>>>> Signed-off-by: Frédéric Danis <frederic.danis.oss@gmail.com>
>>>> ---
>>>> drivers/tty/serdev/core.c | 99 ++++++++++++++++++++++++++++++++++++++++++++---
>>>> 1 file changed, 94 insertions(+), 5 deletions(-)
>>
>> [...]
>>
>>>> @@ -404,9 +488,14 @@ int serdev_controller_add(struct serdev_controller *ctrl)
>>>> if (ret)
>>>> return ret;
>>>>
>>>> - ret = of_serdev_register_devices(ctrl);
>>>> - if (ret)
>>>> + ret_of = of_serdev_register_devices(ctrl);
>>>> + ret_acpi = acpi_serdev_register_devices(ctrl);
>>>> + if (ret_of && ret_acpi) {
>>>> + dev_dbg(&ctrl->dev, "serdev%d no devices registered: of:%d acpi:%d\n",
>>>> + ctrl->nr, ret_of, ret_acpi);
>>>> + ret = -ENODEV;
>>>> goto out_dev_del;
>>>> + }
>>>>
>>>> dev_dbg(&ctrl->dev, "serdev%d registered: dev:%p\n",
>>>> ctrl->nr, &ctrl->dev);
>>>
>>> Shouldn’t we just consider to always register the controller? Even if there are no devices attached to it.
>>
>> You argued for the opposite at least in regards to a serdev ldisc. :)
>> The problem is we use the success or failure here to decide if we
>> create a tty char dev or not. I guess we could move that decision out
>> of the core and let the tty code check for devices and decide.
>
> we never got the serdev ldisc working. Is there still an attempt to get this working. I frankly don’t know what is best here.
I did get it somewhat working, but haven't been working on it more.
Here's what I said in my last mail to you:
> Okay, I've got this kind of working. I can run "ldattach HCI
> /dev/ttyblah" to start the LL driver (nothing attached, just tries
> firmware loading), then kill ldattach and remove the serdev device.
> And it actually works a 2nd time. I've updated my serdev-ldisc branch
> with the fixes. The real question is what have I broken in the tty
> device. At least "echo rob > /dev/ttyS1" still works (in qemu) after
> attaching and de-attaching.
I pushed out my work to serdev-ldisc-v2 branch on my k.org tree.
Rob
^ permalink raw reply
* Re: [RFC 1/3] serdev: Add ACPI support
From: Marcel Holtmann @ 2017-09-07 17:57 UTC (permalink / raw)
To: Rob Herring
Cc: Frédéric Danis, Sebastian Reichel, Loic Poulain,
open list:BLUETOOTH DRIVERS, linux-serial@vger.kernel.org,
linux-acpi@vger.kernel.org
In-Reply-To: <CAL_JsqK9ucGbg=_0Uu8Pugxd7N4gCYHrb4W3PyKaBq_12TdNYA@mail.gmail.com>
Hi Rob,
>>> Signed-off-by: Frédéric Danis <frederic.danis.oss@gmail.com>
>>> ---
>>> drivers/tty/serdev/core.c | 99 ++++++++++++++++++++++++++++++++++++++++++++---
>>> 1 file changed, 94 insertions(+), 5 deletions(-)
>
> [...]
>
>>> @@ -404,9 +488,14 @@ int serdev_controller_add(struct serdev_controller *ctrl)
>>> if (ret)
>>> return ret;
>>>
>>> - ret = of_serdev_register_devices(ctrl);
>>> - if (ret)
>>> + ret_of = of_serdev_register_devices(ctrl);
>>> + ret_acpi = acpi_serdev_register_devices(ctrl);
>>> + if (ret_of && ret_acpi) {
>>> + dev_dbg(&ctrl->dev, "serdev%d no devices registered: of:%d acpi:%d\n",
>>> + ctrl->nr, ret_of, ret_acpi);
>>> + ret = -ENODEV;
>>> goto out_dev_del;
>>> + }
>>>
>>> dev_dbg(&ctrl->dev, "serdev%d registered: dev:%p\n",
>>> ctrl->nr, &ctrl->dev);
>>
>> Shouldn’t we just consider to always register the controller? Even if there are no devices attached to it.
>
> You argued for the opposite at least in regards to a serdev ldisc. :)
> The problem is we use the success or failure here to decide if we
> create a tty char dev or not. I guess we could move that decision out
> of the core and let the tty code check for devices and decide.
we never got the serdev ldisc working. Is there still an attempt to get this working. I frankly don’t know what is best here.
Regards
Marcel
^ permalink raw reply
* Re: [RFC 1/3] serdev: Add ACPI support
From: Rob Herring @ 2017-09-07 17:54 UTC (permalink / raw)
To: Marcel Holtmann
Cc: Frédéric Danis, Sebastian Reichel, Loic Poulain,
open list:BLUETOOTH DRIVERS, linux-serial@vger.kernel.org,
linux-acpi@vger.kernel.org
In-Reply-To: <1BC8D5B0-EC18-4F20-9CBC-D73CB1765683@holtmann.org>
On Thu, Sep 7, 2017 at 12:21 PM, Marcel Holtmann <marcel@holtmann.org> wrote:
> Hi Fred,
>
>> Signed-off-by: Frédéric Danis <frederic.danis.oss@gmail.com>
>> ---
>> drivers/tty/serdev/core.c | 99 ++++++++++++++++++++++++++++++++++++++++++++---
>> 1 file changed, 94 insertions(+), 5 deletions(-)
[...]
>> @@ -404,9 +488,14 @@ int serdev_controller_add(struct serdev_controller *ctrl)
>> if (ret)
>> return ret;
>>
>> - ret = of_serdev_register_devices(ctrl);
>> - if (ret)
>> + ret_of = of_serdev_register_devices(ctrl);
>> + ret_acpi = acpi_serdev_register_devices(ctrl);
>> + if (ret_of && ret_acpi) {
>> + dev_dbg(&ctrl->dev, "serdev%d no devices registered: of:%d acpi:%d\n",
>> + ctrl->nr, ret_of, ret_acpi);
>> + ret = -ENODEV;
>> goto out_dev_del;
>> + }
>>
>> dev_dbg(&ctrl->dev, "serdev%d registered: dev:%p\n",
>> ctrl->nr, &ctrl->dev);
>
> Shouldn’t we just consider to always register the controller? Even if there are no devices attached to it.
You argued for the opposite at least in regards to a serdev ldisc. :)
The problem is we use the success or failure here to decide if we
create a tty char dev or not. I guess we could move that decision out
of the core and let the tty code check for devices and decide.
Rob
^ permalink raw reply
* Re: [RFC 3/3] Bluetooth: hci_bcm: Add ACPI serdev support for BCM2E39
From: Marcel Holtmann @ 2017-09-07 17:27 UTC (permalink / raw)
To: Frédéric Danis
Cc: robh, sre, loic.poulain, linux-bluetooth, linux-serial,
linux-acpi
In-Reply-To: <1504786214-1866-4-git-send-email-frederic.danis.oss@gmail.com>
Hi Fred,
> Signed-off-by: Frédéric Danis <frederic.danis.oss@gmail.com>
> ---
> drivers/bluetooth/hci_bcm.c | 10 +++++++++-
> 1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/bluetooth/hci_bcm.c b/drivers/bluetooth/hci_bcm.c
> index 2e358cc..b1cf07e 100644
> --- a/drivers/bluetooth/hci_bcm.c
> +++ b/drivers/bluetooth/hci_bcm.c
> @@ -922,7 +922,6 @@ static const struct hci_uart_proto bcm_proto = {
> #ifdef CONFIG_ACPI
> static const struct acpi_device_id bcm_acpi_match[] = {
> { "BCM2E1A", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
> - { "BCM2E39", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
> { "BCM2E3A", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
> { "BCM2E3D", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
> { "BCM2E3F", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
> @@ -942,6 +941,14 @@ static const struct acpi_device_id bcm_acpi_match[] = {
> MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
> #endif
>
> +#ifdef CONFIG_ACPI
> +static const struct acpi_device_id bcm_serdev_acpi_match[] = {
> + { "BCM2E39", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
> + { },
> +};
> +MODULE_DEVICE_TABLE(acpi, bcm_serdev_acpi_match);
> +#endif
> +
> /* Platform suspend and resume callbacks */
> static const struct dev_pm_ops bcm_pm_ops = {
> SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume)
> @@ -999,6 +1006,7 @@ static struct serdev_device_driver bcm_serdev_driver = {
> .driver = {
> .name = "hci_uart_bcm",
> .of_match_table = of_match_ptr(bcm_bluetooth_of_match),
> + .acpi_match_table = ACPI_PTR(bcm_serdev_acpi_match),
> },
> };
I think doing this one device at a time is actually fine. However please add a proper commit message for it explaining it.
Regards
Marcel
^ permalink raw reply
* Re: [RFC 2/3] ACPI / scan: Fix enumeration for special UART devices
From: Marcel Holtmann @ 2017-09-07 17:25 UTC (permalink / raw)
To: Frédéric Danis
Cc: robh, sre, loic.poulain, linux-bluetooth, linux-serial,
linux-acpi
In-Reply-To: <1504786214-1866-3-git-send-email-frederic.danis.oss@gmail.com>
Hi Fred,
> UART devices is expected to be enumerated by SerDev subsystem.
> Rename spi_i2c_slave to serial_slave as this is no more specific to spi or
> i2c buses.
>
> Signed-off-by: Frédéric Danis <frederic.danis.oss@gmail.com>
> ---
> drivers/acpi/scan.c | 29 ++++++++++++-----------------
> include/acpi/acpi_bus.h | 2 +-
> 2 files changed, 13 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> index 70fd550..04c5ecc 100644
> --- a/drivers/acpi/scan.c
> +++ b/drivers/acpi/scan.c
> @@ -1429,35 +1429,30 @@ static void acpi_init_coherency(struct acpi_device *adev)
> adev->flags.coherent_dma = cca;
> }
>
> -static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data)
> +static int acpi_check_serial_slave(struct acpi_resource *ares, void *data)
> {
> - bool *is_spi_i2c_slave_p = data;
> + bool *is_serial_slave_p = data;
>
> if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
> return 1;
>
> - /*
> - * devices that are connected to UART still need to be enumerated to
> - * platform bus
> - */
> - if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
> - *is_spi_i2c_slave_p = true;
> + *is_serial_slave_p = true;
>
> /* no need to do more checking */
> return -1;
> }
>
isn’t this disabled the I2C support? I mean serial bus doesn’t always mean UART. There are other serial buses and even USB is actually a serial bus.
> -static bool acpi_is_spi_i2c_slave(struct acpi_device *device)
> +static bool acpi_is_serial_slave(struct acpi_device *device)
> {
> struct list_head resource_list;
> - bool is_spi_i2c_slave = false;
> + bool is_serial_slave = false;
>
> INIT_LIST_HEAD(&resource_list);
> - acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
> - &is_spi_i2c_slave);
> + acpi_dev_get_resources(device, &resource_list, acpi_check_serial_slave,
> + &is_serial_slave);
> acpi_dev_free_resource_list(&resource_list);
>
> - return is_spi_i2c_slave;
> + return is_serial_slave;
> }
>
> void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
> @@ -1476,7 +1471,7 @@ void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
> acpi_bus_get_flags(device);
> device->flags.match_driver = false;
> device->flags.initialized = true;
> - device->flags.spi_i2c_slave = acpi_is_spi_i2c_slave(device);
> + device->flags.serial_slave = acpi_is_serial_slave(device);
> acpi_device_clear_enumerated(device);
> device_initialize(&device->dev);
> dev_set_uevent_suppress(&device->dev, true);
> @@ -1763,7 +1758,7 @@ static void acpi_default_enumeration(struct acpi_device *device)
> * Do not enumerate SPI/I2C slaves as they will be enumerated by their
> * respective parents.
> */
> - if (!device->flags.spi_i2c_slave) {
> + if (!device->flags.serial_slave) {
> acpi_create_platform_device(device, NULL);
> acpi_device_set_enumerated(device);
> } else {
> @@ -1860,7 +1855,7 @@ static void acpi_bus_attach(struct acpi_device *device)
> return;
>
> device->flags.match_driver = true;
> - if (ret > 0 && !device->flags.spi_i2c_slave) {
> + if (ret > 0 && !device->flags.serial_slave) {
> acpi_device_set_enumerated(device);
> goto ok;
> }
> @@ -1869,7 +1864,7 @@ static void acpi_bus_attach(struct acpi_device *device)
> if (ret < 0)
> return;
>
> - if (!device->pnp.type.platform_id && !device->flags.spi_i2c_slave)
> + if (!device->pnp.type.platform_id && !device->flags.serial_slave)
> acpi_device_set_enumerated(device);
> else
> acpi_default_enumeration(device);
> diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
> index 68bc6be..49a82f8 100644
> --- a/include/acpi/acpi_bus.h
> +++ b/include/acpi/acpi_bus.h
> @@ -211,7 +211,7 @@ struct acpi_device_flags {
> u32 of_compatible_ok:1;
> u32 coherent_dma:1;
> u32 cca_seen:1;
> - u32 spi_i2c_slave:1;
> + u32 serial_slave:1;
> u32 reserved:19;
> };
I am not an ACPI expert, but wouldn’t we better have a serial_bus_slave here. And the serial_bus_slave can be either UART or I2C? Or have a pretty good commit message explaining why this is serial_slave only.
Regards
Marcel
^ permalink raw reply
* Re: [RFC 1/3] serdev: Add ACPI support
From: Marcel Holtmann @ 2017-09-07 17:21 UTC (permalink / raw)
To: Frédéric Danis
Cc: robh, sre, loic.poulain, linux-bluetooth, linux-serial,
linux-acpi
In-Reply-To: <1504786214-1866-2-git-send-email-frederic.danis.oss@gmail.com>
Hi Fred,
> Signed-off-by: Frédéric Danis <frederic.danis.oss@gmail.com>
> ---
> drivers/tty/serdev/core.c | 99 ++++++++++++++++++++++++++++++++++++++++++++---
> 1 file changed, 94 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c
> index ae1aaa0..923dd4ad 100644
> --- a/drivers/tty/serdev/core.c
> +++ b/drivers/tty/serdev/core.c
> @@ -14,6 +14,7 @@
> * GNU General Public License for more details.
> */
>
> +#include <linux/acpi.h>
> #include <linux/errno.h>
> #include <linux/idr.h>
> #include <linux/kernel.h>
> @@ -49,13 +50,22 @@ static const struct device_type serdev_ctrl_type = {
>
> static int serdev_device_match(struct device *dev, struct device_driver *drv)
> {
> - /* TODO: ACPI and platform matching */
> + /* TODO: platform matching */
> + if (acpi_driver_match_device(dev, drv))
> + return 1;
> +
> return of_driver_match_device(dev, drv);
> }
>
> static int serdev_uevent(struct device *dev, struct kobj_uevent_env *env)
> {
> - /* TODO: ACPI and platform modalias */
> + int rc;
> +
> + /* TODO: platform modalias */
> + rc = acpi_device_uevent_modalias(dev, env);
> + if (rc != -ENODEV)
> + return rc;
> +
> return of_device_uevent_modalias(dev, env);
> }
>
> @@ -260,6 +270,12 @@ static int serdev_drv_remove(struct device *dev)
> static ssize_t modalias_show(struct device *dev,
> struct device_attribute *attr, char *buf)
> {
> + int len;
> +
> + len = acpi_device_modalias(dev, buf, PAGE_SIZE - 1);
> + if (len != -ENODEV)
> + return len;
> +
> return of_device_modalias(dev, buf, PAGE_SIZE);
> }
> DEVICE_ATTR_RO(modalias);
> @@ -385,6 +401,74 @@ static int of_serdev_register_devices(struct serdev_controller *ctrl)
> return 0;
> }
>
> +#ifdef CONFIG_ACPI
> +static acpi_status acpi_serdev_register_device(struct serdev_controller *ctrl,
> + struct acpi_device *adev)
> +{
> + struct serdev_device *serdev = NULL;
> + int err;
> +
> + if (acpi_bus_get_status(adev) || !adev->status.present ||
> + acpi_device_enumerated(adev))
> + return AE_OK;
> +
> + serdev = serdev_device_alloc(ctrl);
> + if (!serdev) {
> + dev_err(&ctrl->dev, "failed to allocate Serial device for %s\n",
> + dev_name(&adev->dev));
> + return AE_NO_MEMORY;
> + }
> +
> + ACPI_COMPANION_SET(&serdev->dev, adev);
> + acpi_device_set_enumerated(adev);
> +
> + err = serdev_device_add(serdev);
> + if (err) {
> + dev_err(&serdev->dev,
> + "failure adding ACPI device. status %d\n", err);
> + serdev_device_put(serdev);
> + }
> +
> + return AE_OK;
> +}
> +
> +static acpi_status acpi_serdev_add_device(acpi_handle handle, u32 level,
> + void *data, void **return_value)
> +{
> + struct serdev_controller *ctrl = data;
> + struct acpi_device *adev;
> +
> + if (acpi_bus_get_device(handle, &adev))
> + return AE_OK;
> +
> + return acpi_serdev_register_device(ctrl, adev);
> +}
> +
> +static int acpi_serdev_register_devices(struct serdev_controller *ctrl)
> +{
> + acpi_status status;
> + acpi_handle handle;
> +
> + handle = ACPI_HANDLE(ctrl->dev.parent);
> + if (!handle)
> + return -ENODEV;
> +
> + status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
> + acpi_serdev_add_device, NULL, ctrl, NULL);
> + if (ACPI_FAILURE(status)) {
> + dev_warn(&ctrl->dev, "failed to enumerate Serial slaves\n");
> + return -ENODEV;
> + }
> +
> + return 0;
> +}
how are we ensuring that we only take UART devices into account here?
> +#else
> +static inline int acpi_serdev_register_devices(struct serdev_controller *ctlr)
> +{
> + return -ENODEV;
> +}
> +#endif /* CONFIG_ACPI */
> +
> /**
> * serdev_controller_add() - Add an serdev controller
> * @ctrl: controller to be registered.
> @@ -394,7 +478,7 @@ static int of_serdev_register_devices(struct serdev_controller *ctrl)
> */
> int serdev_controller_add(struct serdev_controller *ctrl)
> {
> - int ret;
> + int ret_of, ret_acpi, ret;
>
> /* Can't register until after driver model init */
> if (WARN_ON(!is_registered))
> @@ -404,9 +488,14 @@ int serdev_controller_add(struct serdev_controller *ctrl)
> if (ret)
> return ret;
>
> - ret = of_serdev_register_devices(ctrl);
> - if (ret)
> + ret_of = of_serdev_register_devices(ctrl);
> + ret_acpi = acpi_serdev_register_devices(ctrl);
> + if (ret_of && ret_acpi) {
> + dev_dbg(&ctrl->dev, "serdev%d no devices registered: of:%d acpi:%d\n",
> + ctrl->nr, ret_of, ret_acpi);
> + ret = -ENODEV;
> goto out_dev_del;
> + }
>
> dev_dbg(&ctrl->dev, "serdev%d registered: dev:%p\n",
> ctrl->nr, &ctrl->dev);
Shouldn’t we just consider to always register the controller? Even if there are no devices attached to it.
Regards
Marcel
^ permalink raw reply
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