lkml.org 
[lkml]   [2013]   [Nov]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 1/2] watchdog: bcm281xx: Watchdog Driver
Date
This commit adds support for the watchdog timer used on the BCM281xx
family of SoCs.

Signed-off-by: Markus Mayer <markus.mayer@linaro.org>
Reviewed-by: Matt Porter <matt.porter@linaro.org>
---
drivers/watchdog/Kconfig | 21 +++
drivers/watchdog/Makefile | 1 +
drivers/watchdog/bcm_kona_wdt.c | 399 +++++++++++++++++++++++++++++++++++++++
3 files changed, 421 insertions(+)
create mode 100644 drivers/watchdog/bcm_kona_wdt.c

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index d1d53f3..59013f6 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1121,6 +1121,27 @@ config BCM2835_WDT
To compile this driver as a loadable module, choose M here.
The module will be called bcm2835_wdt.

+config BCM_KONA_WDT
+ tristate "BCM Kona Watchdog"
+ depends on ARCH_BCM
+ select WATCHDOG_CORE
+ help
+ Support for the watchdog timer on the following Broadcom BCM281xx
+ family, which includes BCM11130, BCM11140, BCM11351, BCM28145 and
+ BCM28155 variants.
+
+ Say 'Y' or 'M' here to enable the driver.
+
+config BCM_KONA_WDT_DEBUG
+ bool "DEBUGFS support for BCM Kona Watchdog"
+ depends on BCM_KONA_WDT
+ help
+ If enabled, adds /sys/kernel/debug/bcm-kona-wdt/info which provides
+ access to the driver's internal data structures as well as watchdog
+ timer hardware registres.
+
+ If in doubt, say 'N'.
+
config LANTIQ_WDT
tristate "Lantiq SoC watchdog"
depends on LANTIQ
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 6c5bb27..7c860ca 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -55,6 +55,7 @@ obj-$(CONFIG_IMX2_WDT) += imx2_wdt.o
obj-$(CONFIG_UX500_WATCHDOG) += ux500_wdt.o
obj-$(CONFIG_RETU_WATCHDOG) += retu_wdt.o
obj-$(CONFIG_BCM2835_WDT) += bcm2835_wdt.o
+obj-$(CONFIG_BCM_KONA_WDT) += bcm_kona_wdt.o

# AVR32 Architecture
obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
diff --git a/drivers/watchdog/bcm_kona_wdt.c b/drivers/watchdog/bcm_kona_wdt.c
new file mode 100644
index 0000000..c47ac77
--- /dev/null
+++ b/drivers/watchdog/bcm_kona_wdt.c
@@ -0,0 +1,399 @@
+/*
+ * Copyright (C) 2013 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/debugfs.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/watchdog.h>
+
+#define SECWDOG_CTRL_REG 0x00000000
+#define SECWDOG_COUNT_REG 0x00000004
+
+#define SECWDOG_RESERVED_MASK 0x1dffffff
+#define SECWDOG_WD_LOAD_FLAG_MASK 0x10000000
+#define SECWDOG_EN_MASK 0x08000000
+#define SECWDOG_SRSTEN_MASK 0x04000000
+#define SECWDOG_RES_MASK 0x00f00000
+#define SECWDOG_COUNT_MASK 0x000fffff
+
+#define SECWDOG_MAX_COUNT SECWDOG_COUNT_MASK
+#define SECWDOG_CLKS_SHIFT 20
+#define SECWDOG_MAX_RES 15
+#define SECWDOG_DEFAULT_RESOLUTION 4
+#define SECWDOG_MAX_TRY 10000
+
+#define SECS_TO_TICKS(x, w) ((x) << (w)->resolution)
+#define TICKS_TO_SECS(x, w) ((x) >> (w)->resolution)
+
+#define BCM_KONA_WDT_NAME "bcm-kona-wdt"
+
+struct bcm_kona_wdt {
+ void __iomem *base;
+ int resolution;
+ spinlock_t lock;
+#ifdef CONFIG_BCM_KONA_WDT_DEBUG
+ struct dentry *debugfs;
+#endif
+};
+
+static uint32_t secure_register_read(void __iomem *addr, int *timeout)
+{
+ uint32_t val;
+ unsigned count = 0;
+
+ do {
+ val = readl_relaxed(addr);
+ count++;
+ } while ((val & SECWDOG_WD_LOAD_FLAG_MASK) != 0 &&
+ count < SECWDOG_MAX_TRY);
+ if (timeout)
+ *timeout = ((val & SECWDOG_WD_LOAD_FLAG_MASK) != 0);
+
+ /* We always mask out reserved bits before returning the value. */
+ val &= SECWDOG_RESERVED_MASK;
+
+ return val;
+}
+
+
+#ifdef CONFIG_BCM_KONA_WDT_DEBUG
+
+static int bcm_kona_wdt_dbg_show(struct seq_file *s, void *data)
+{
+ uint32_t ctl_val, cur_val;
+ int ret, ctl_timeout, cur_timeout;
+ unsigned long flags;
+ struct bcm_kona_wdt *wdt = s->private;
+
+ if (!wdt)
+ return seq_printf(s, "No device pointer\n");
+
+ spin_lock_irqsave(&wdt->lock, flags);
+ ctl_val = secure_register_read(wdt->base + SECWDOG_CTRL_REG,
+ &ctl_timeout);
+ cur_val = secure_register_read(wdt->base + SECWDOG_COUNT_REG,
+ &cur_timeout);
+ spin_unlock_irqrestore(&wdt->lock, flags);
+
+ if (ctl_timeout || cur_timeout) {
+ ret = seq_printf(s, "Error accessing hardware\n");
+ } else {
+ int ctl, cur, ctl_sec, cur_sec, res;
+
+ ctl = ctl_val & SECWDOG_COUNT_MASK;
+ res = (ctl_val & SECWDOG_RES_MASK) >> SECWDOG_CLKS_SHIFT;
+ cur = cur_val & SECWDOG_COUNT_MASK;
+ ctl_sec = TICKS_TO_SECS(ctl, wdt);
+ cur_sec = TICKS_TO_SECS(cur, wdt);
+ ret = seq_printf(s, "Resolution: %d / %d\n"
+ "Control: %d s / %d (%#x) ticks\n"
+ "Current: %d s / %d (%#x) ticks\n", res,
+ wdt->resolution, ctl_sec, ctl, ctl, cur_sec,
+ cur, cur);
+ }
+
+ return ret;
+}
+
+static int bcm_kona_dbg_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, bcm_kona_wdt_dbg_show, inode->i_private);
+}
+
+static const struct file_operations bcm_kona_dbg_operations = {
+ .open = bcm_kona_dbg_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static struct dentry *bcm_kona_wdt_debugfs_init(struct bcm_kona_wdt *wdt,
+ struct watchdog_device *wdd)
+{
+ struct dentry *dir;
+
+ dir = debugfs_create_dir(BCM_KONA_WDT_NAME, NULL);
+ if (!dir)
+ return NULL;
+
+ if (!debugfs_create_file("info", S_IFREG | S_IRUGO, dir, wdt,
+ &bcm_kona_dbg_operations))
+ goto out_err;
+
+ return dir;
+
+out_err:
+ debugfs_remove_recursive(dir);
+ return NULL;
+}
+
+static void bcm_kona_debugfs_exit(struct dentry *debugfs)
+{
+ debugfs_remove_recursive(debugfs);
+}
+
+#endif /* CONFIG_BCM_KONA_WDT_DEBUG */
+
+
+static int bcm_kona_wdt_set_resolution_reg(struct bcm_kona_wdt *wdt)
+{
+ uint32_t val;
+ int timeout;
+ unsigned long flags;
+ int ret = 0;
+
+ if (wdt->resolution > SECWDOG_MAX_RES)
+ return -EINVAL;
+
+ spin_lock_irqsave(&wdt->lock, flags);
+
+ val = secure_register_read(wdt->base + SECWDOG_CTRL_REG, &timeout);
+ if (!timeout) {
+ val &= ~SECWDOG_RES_MASK;
+ val |= wdt->resolution << SECWDOG_CLKS_SHIFT;
+ writel_relaxed(val, wdt->base + SECWDOG_CTRL_REG);
+ } else {
+ ret = -EAGAIN;
+ }
+
+ spin_unlock_irqrestore(&wdt->lock, flags);
+
+ return ret;
+}
+
+static int bcm_kona_wdt_set_timeout_reg(struct watchdog_device *wdog)
+{
+ struct bcm_kona_wdt *wdt = watchdog_get_drvdata(wdog);
+ uint32_t val;
+ int timeout;
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&wdt->lock, flags);
+
+ val = secure_register_read(wdt->base + SECWDOG_CTRL_REG, &timeout);
+ if (!timeout) {
+ val &= ~SECWDOG_COUNT_MASK;
+ val |= SECS_TO_TICKS(wdog->timeout, wdt);
+ writel_relaxed(val, wdt->base + SECWDOG_CTRL_REG);
+ } else {
+ ret = -EAGAIN;
+ }
+
+ spin_unlock_irqrestore(&wdt->lock, flags);
+
+ return ret;
+}
+
+static int bcm_kona_wdt_set_timeout(struct watchdog_device *wdog,
+ unsigned int t)
+{
+ wdog->timeout = t;
+ return 0;
+}
+
+static unsigned int bcm_kona_wdt_get_timeleft(struct watchdog_device *wdog)
+{
+ struct bcm_kona_wdt *wdt = watchdog_get_drvdata(wdog);
+ uint32_t val;
+ int timeout;
+ unsigned long flags;
+
+ spin_lock_irqsave(&wdt->lock, flags);
+ val = secure_register_read(wdt->base + SECWDOG_COUNT_REG, &timeout);
+ spin_unlock_irqrestore(&wdt->lock, flags);
+
+ if (timeout)
+ return -EAGAIN;
+
+ return TICKS_TO_SECS(val & SECWDOG_COUNT_MASK, wdt);
+}
+
+static int bcm_kona_wdt_start(struct watchdog_device *wdog)
+{
+ struct bcm_kona_wdt *wdt = watchdog_get_drvdata(wdog);
+ uint32_t val;
+ int timeout;
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&wdt->lock, flags);
+
+ val = secure_register_read(wdt->base + SECWDOG_CTRL_REG, &timeout);
+ if (!timeout) {
+ val &= ~SECWDOG_COUNT_MASK;
+ val |= SECWDOG_EN_MASK | SECWDOG_SRSTEN_MASK |
+ SECS_TO_TICKS(wdog->timeout, wdt);
+ writel_relaxed(val, wdt->base + SECWDOG_CTRL_REG);
+ } else {
+ ret = -EAGAIN;
+ }
+
+ spin_unlock_irqrestore(&wdt->lock, flags);
+
+ if (!timeout)
+ dev_info(wdog->dev, "Watchdog timer started");
+
+ return ret;
+}
+
+static int bcm_kona_wdt_stop(struct watchdog_device *wdog)
+{
+ struct bcm_kona_wdt *wdt = watchdog_get_drvdata(wdog);
+ uint32_t val;
+ int timeout, timeleft;
+ unsigned long flags;
+ int ret = 0;
+
+ timeleft = bcm_kona_wdt_get_timeleft(wdog);
+ if (timeleft < 0)
+ return ret;
+
+ spin_lock_irqsave(&wdt->lock, flags);
+
+ val = secure_register_read(wdt->base + SECWDOG_CTRL_REG, &timeout);
+ if (!timeout) {
+ val &= ~(SECWDOG_EN_MASK | SECWDOG_SRSTEN_MASK |
+ SECWDOG_COUNT_MASK);
+ val |= SECS_TO_TICKS(timeleft, wdt);
+ writel_relaxed(val, wdt->base + SECWDOG_CTRL_REG);
+ } else {
+ ret = -EAGAIN;
+ }
+
+ spin_unlock_irqrestore(&wdt->lock, flags);
+
+ if (!timeout)
+ dev_info(wdog->dev, "Watchdog timer stopped");
+
+ return ret;
+}
+
+static struct watchdog_ops bcm_kona_wdt_ops = {
+ .owner = THIS_MODULE,
+ .start = bcm_kona_wdt_start,
+ .stop = bcm_kona_wdt_stop,
+ .set_timeout = bcm_kona_wdt_set_timeout,
+ .get_timeleft = bcm_kona_wdt_get_timeleft,
+};
+
+static struct watchdog_info bcm_kona_wdt_info = {
+ .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE |
+ WDIOF_KEEPALIVEPING,
+ .identity = "Broadcom Kona Watchdog Timer",
+};
+
+static struct watchdog_device bcm_kona_wdt_wdd = {
+ .info = &bcm_kona_wdt_info,
+ .ops = &bcm_kona_wdt_ops,
+ .min_timeout = 1,
+ .max_timeout = SECWDOG_MAX_COUNT >> SECWDOG_DEFAULT_RESOLUTION,
+ .timeout = SECWDOG_MAX_COUNT >> SECWDOG_DEFAULT_RESOLUTION,
+};
+
+static void bcm_kona_wdt_shutdown(struct platform_device *pdev)
+{
+ bcm_kona_wdt_stop(&bcm_kona_wdt_wdd);
+}
+
+static int bcm_kona_wdt_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct bcm_kona_wdt *wdt;
+ struct resource *res;
+ int ret;
+
+ wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
+ if (!wdt) {
+ dev_err(dev, "Failed to allocate memory for watchdog device");
+ return -ENOMEM;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ wdt->base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(wdt->base))
+ return -ENODEV;
+
+ wdt->resolution = SECWDOG_DEFAULT_RESOLUTION;
+ ret = bcm_kona_wdt_set_resolution_reg(wdt);
+ if (ret) {
+ dev_err(dev, "Failed to set resolution (error: %d)", ret);
+ return ret;
+ }
+
+ spin_lock_init(&wdt->lock);
+ platform_set_drvdata(pdev, wdt);
+ watchdog_set_drvdata(&bcm_kona_wdt_wdd, wdt);
+
+ ret = bcm_kona_wdt_set_timeout_reg(&bcm_kona_wdt_wdd);
+ if (ret) {
+ dev_err(dev, "Failed set watchdog timeout");
+ return ret;
+ }
+
+ ret = watchdog_register_device(&bcm_kona_wdt_wdd);
+ if (ret) {
+ dev_err(dev, "Failed to register watchdog device");
+ return ret;
+ }
+
+#ifdef CONFIG_BCM_KONA_WDT_DEBUG
+ wdt->debugfs = bcm_kona_wdt_debugfs_init(wdt, &bcm_kona_wdt_wdd);
+#endif
+ dev_info(dev, "Broadcom Kona Watchdog Timer");
+
+ return 0;
+}
+
+static int bcm_kona_wdt_remove(struct platform_device *pdev)
+{
+#ifdef CONFIG_BCM_KONA_WDT_DEBUG
+ struct bcm_kona_wdt *wdt = platform_get_drvdata(pdev);
+
+ if (wdt->debugfs)
+ bcm_kona_debugfs_exit(wdt->debugfs);
+#endif /* CONFIG_BCM_KONA_WDT_DEBUG */
+ bcm_kona_wdt_shutdown(pdev);
+ watchdog_unregister_device(&bcm_kona_wdt_wdd);
+ dev_info(&pdev->dev, "Watchdog driver disabled");
+
+ return 0;
+}
+
+static const struct of_device_id bcm_kona_wdt_of_match[] = {
+ { .compatible = "brcm,kona-wdt", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, bcm_kona_wdt_of_match);
+
+static struct platform_driver bcm_kona_wdt_driver = {
+ .driver = {
+ .name = BCM_KONA_WDT_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = bcm_kona_wdt_of_match,
+ },
+ .probe = bcm_kona_wdt_probe,
+ .remove = bcm_kona_wdt_remove,
+ .shutdown = bcm_kona_wdt_shutdown,
+};
+
+module_platform_driver(bcm_kona_wdt_driver);
+
+MODULE_AUTHOR("Markus Mayer <mmayer@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Kona Watchdog Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
--
1.7.9.5



\
 
 \ /
  Last update: 2013-11-08 22:01    [W:0.055 / U:0.064 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site