diff options
Diffstat (limited to 'target/linux/lantiq/patches-2.6.32/0013-MIPS-Lantiq-Add-watchdog-support.patch')
-rw-r--r-- | target/linux/lantiq/patches-2.6.32/0013-MIPS-Lantiq-Add-watchdog-support.patch | 310 |
1 files changed, 0 insertions, 310 deletions
diff --git a/target/linux/lantiq/patches-2.6.32/0013-MIPS-Lantiq-Add-watchdog-support.patch b/target/linux/lantiq/patches-2.6.32/0013-MIPS-Lantiq-Add-watchdog-support.patch deleted file mode 100644 index 903f67468..000000000 --- a/target/linux/lantiq/patches-2.6.32/0013-MIPS-Lantiq-Add-watchdog-support.patch +++ /dev/null @@ -1,310 +0,0 @@ -From 3466449c8f455da0cb646231602e6af16190f592 Mon Sep 17 00:00:00 2001 -From: John Crispin <blogic@openwrt.org> -Date: Thu, 5 May 2011 23:00:23 +0200 -Subject: [PATCH 13/13] MIPS: Lantiq: Add watchdog support - -This patch adds the driver for the watchdog found inside the Lantiq SoC family. - -Signed-off-by: John Crispin <blogic@openwrt.org> -Signed-off-by: Ralph Hempel <ralph.hempel@lantiq.com> -Cc: Wim Van Sebroeck <wim@iguana.be> -Cc: linux-mips@linux-mips.org -Cc: linux-watchdog@vger.kernel.org -Patchwork: https://patchwork.linux-mips.org/patch/2327/ -Signed-off-by: Ralf Baechle <ralf@linux-mips.org> ---- - drivers/watchdog/Kconfig | 6 + - drivers/watchdog/Makefile | 1 + - drivers/watchdog/lantiq_wdt.c | 261 +++++++++++++++++++++++++++++++++++++++++ - 3 files changed, 268 insertions(+), 0 deletions(-) - create mode 100644 drivers/watchdog/lantiq_wdt.c - ---- a/drivers/watchdog/Kconfig -+++ b/drivers/watchdog/Kconfig -@@ -850,6 +850,12 @@ - help - Hardware driver for the built-in watchdog timer on TXx9 MIPS SoCs. - -+config LANTIQ_WDT -+ tristate "Lantiq SoC watchdog" -+ depends on LANTIQ -+ help -+ Hardware driver for the Lantiq SoC Watchdog Timer. -+ - # PARISC Architecture - - # POWERPC Architecture ---- a/drivers/watchdog/Makefile -+++ b/drivers/watchdog/Makefile -@@ -113,6 +113,7 @@ - obj-$(CONFIG_SIBYTE_WDOG) += sb_wdog.o - obj-$(CONFIG_AR7_WDT) += ar7_wdt.o - obj-$(CONFIG_TXX9_WDT) += txx9wdt.o -+obj-$(CONFIG_LANTIQ_WDT) += lantiq_wdt.o - - # PARISC Architecture - ---- /dev/null -+++ b/drivers/watchdog/lantiq_wdt.c -@@ -0,0 +1,261 @@ -+/* -+ * This program is free software; you can redistribute it and/or modify it -+ * under the terms of the GNU General Public License version 2 as published -+ * by the Free Software Foundation. -+ * -+ * Copyright (C) 2010 John Crispin <blogic@openwrt.org> -+ * Based on EP93xx wdt driver -+ */ -+ -+#include <linux/module.h> -+#include <linux/fs.h> -+#include <linux/miscdevice.h> -+#include <linux/watchdog.h> -+#include <linux/platform_device.h> -+#include <linux/uaccess.h> -+#include <linux/clk.h> -+#include <linux/io.h> -+ -+#include <lantiq.h> -+ -+/* Section 3.4 of the datasheet -+ * The password sequence protects the WDT control register from unintended -+ * write actions, which might cause malfunction of the WDT. -+ * -+ * essentially the following two magic passwords need to be written to allow -+ * IO access to the WDT core -+ */ -+#define LTQ_WDT_PW1 0x00BE0000 -+#define LTQ_WDT_PW2 0x00DC0000 -+ -+#define LTQ_WDT_CR 0x0 /* watchdog control register */ -+#define LTQ_WDT_SR 0x8 /* watchdog status register */ -+ -+#define LTQ_WDT_SR_EN (0x1 << 31) /* enable bit */ -+#define LTQ_WDT_SR_PWD (0x3 << 26) /* turn on power */ -+#define LTQ_WDT_SR_CLKDIV (0x3 << 24) /* turn on clock and set */ -+ /* divider to 0x40000 */ -+#define LTQ_WDT_DIVIDER 0x40000 -+#define LTQ_MAX_TIMEOUT ((1 << 16) - 1) /* the reload field is 16 bit */ -+ -+static int nowayout = WATCHDOG_NOWAYOUT; -+ -+static void __iomem *ltq_wdt_membase; -+static unsigned long ltq_io_region_clk_rate; -+ -+static unsigned long ltq_wdt_bootstatus; -+static unsigned long ltq_wdt_in_use; -+static int ltq_wdt_timeout = 30; -+static int ltq_wdt_ok_to_close; -+ -+static void -+ltq_wdt_enable(void) -+{ -+ ltq_wdt_timeout = ltq_wdt_timeout * -+ (ltq_io_region_clk_rate / LTQ_WDT_DIVIDER) + 0x1000; -+ if (ltq_wdt_timeout > LTQ_MAX_TIMEOUT) -+ ltq_wdt_timeout = LTQ_MAX_TIMEOUT; -+ -+ /* write the first password magic */ -+ ltq_w32(LTQ_WDT_PW1, ltq_wdt_membase + LTQ_WDT_CR); -+ /* write the second magic plus the configuration and new timeout */ -+ ltq_w32(LTQ_WDT_SR_EN | LTQ_WDT_SR_PWD | LTQ_WDT_SR_CLKDIV | -+ LTQ_WDT_PW2 | ltq_wdt_timeout, ltq_wdt_membase + LTQ_WDT_CR); -+} -+ -+static void -+ltq_wdt_disable(void) -+{ -+ /* write the first password magic */ -+ ltq_w32(LTQ_WDT_PW1, ltq_wdt_membase + LTQ_WDT_CR); -+ /* write the second password magic with no config -+ * this turns the watchdog off -+ */ -+ ltq_w32(LTQ_WDT_PW2, ltq_wdt_membase + LTQ_WDT_CR); -+} -+ -+static ssize_t -+ltq_wdt_write(struct file *file, const char __user *data, -+ size_t len, loff_t *ppos) -+{ -+ if (len) { -+ if (!nowayout) { -+ size_t i; -+ -+ ltq_wdt_ok_to_close = 0; -+ for (i = 0; i != len; i++) { -+ char c; -+ -+ if (get_user(c, data + i)) -+ return -EFAULT; -+ if (c == 'V') -+ ltq_wdt_ok_to_close = 1; -+ else -+ ltq_wdt_ok_to_close = 0; -+ } -+ } -+ ltq_wdt_enable(); -+ } -+ -+ return len; -+} -+ -+static struct watchdog_info ident = { -+ .options = WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | -+ WDIOF_CARDRESET, -+ .identity = "ltq_wdt", -+}; -+ -+static long -+ltq_wdt_ioctl(struct file *file, -+ unsigned int cmd, unsigned long arg) -+{ -+ int ret = -ENOTTY; -+ -+ switch (cmd) { -+ case WDIOC_GETSUPPORT: -+ ret = copy_to_user((struct watchdog_info __user *)arg, &ident, -+ sizeof(ident)) ? -EFAULT : 0; -+ break; -+ -+ case WDIOC_GETBOOTSTATUS: -+ ret = put_user(ltq_wdt_bootstatus, (int __user *)arg); -+ break; -+ -+ case WDIOC_GETSTATUS: -+ ret = put_user(0, (int __user *)arg); -+ break; -+ -+ case WDIOC_SETTIMEOUT: -+ ret = get_user(ltq_wdt_timeout, (int __user *)arg); -+ if (!ret) -+ ltq_wdt_enable(); -+ /* intentional drop through */ -+ case WDIOC_GETTIMEOUT: -+ ret = put_user(ltq_wdt_timeout, (int __user *)arg); -+ break; -+ -+ case WDIOC_KEEPALIVE: -+ ltq_wdt_enable(); -+ ret = 0; -+ break; -+ } -+ return ret; -+} -+ -+static int -+ltq_wdt_open(struct inode *inode, struct file *file) -+{ -+ if (test_and_set_bit(0, <q_wdt_in_use)) -+ return -EBUSY; -+ ltq_wdt_in_use = 1; -+ ltq_wdt_enable(); -+ -+ return nonseekable_open(inode, file); -+} -+ -+static int -+ltq_wdt_release(struct inode *inode, struct file *file) -+{ -+ if (ltq_wdt_ok_to_close) -+ ltq_wdt_disable(); -+ else -+ pr_err("ltq_wdt: watchdog closed without warning\n"); -+ ltq_wdt_ok_to_close = 0; -+ clear_bit(0, <q_wdt_in_use); -+ -+ return 0; -+} -+ -+static const struct file_operations ltq_wdt_fops = { -+ .owner = THIS_MODULE, -+ .write = ltq_wdt_write, -+ .unlocked_ioctl = ltq_wdt_ioctl, -+ .open = ltq_wdt_open, -+ .release = ltq_wdt_release, -+ .llseek = no_llseek, -+}; -+ -+static struct miscdevice ltq_wdt_miscdev = { -+ .minor = WATCHDOG_MINOR, -+ .name = "watchdog", -+ .fops = <q_wdt_fops, -+}; -+ -+static int __init -+ltq_wdt_probe(struct platform_device *pdev) -+{ -+ struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); -+ struct clk *clk; -+ -+ if (!res) { -+ dev_err(&pdev->dev, "cannot obtain I/O memory region"); -+ return -ENOENT; -+ } -+ res = devm_request_mem_region(&pdev->dev, res->start, -+ resource_size(res), dev_name(&pdev->dev)); -+ if (!res) { -+ dev_err(&pdev->dev, "cannot request I/O memory region"); -+ return -EBUSY; -+ } -+ ltq_wdt_membase = devm_ioremap_nocache(&pdev->dev, res->start, -+ resource_size(res)); -+ if (!ltq_wdt_membase) { -+ dev_err(&pdev->dev, "cannot remap I/O memory region\n"); -+ return -ENOMEM; -+ } -+ -+ /* we do not need to enable the clock as it is always running */ -+ clk = clk_get(&pdev->dev, "io"); -+ WARN_ON(!clk); -+ ltq_io_region_clk_rate = clk_get_rate(clk); -+ clk_put(clk); -+ -+ if (ltq_reset_cause() == LTQ_RST_CAUSE_WDTRST) -+ ltq_wdt_bootstatus = WDIOF_CARDRESET; -+ -+ return misc_register(<q_wdt_miscdev); -+} -+ -+static int __devexit -+ltq_wdt_remove(struct platform_device *pdev) -+{ -+ misc_deregister(<q_wdt_miscdev); -+ -+ if (ltq_wdt_membase) -+ iounmap(ltq_wdt_membase); -+ -+ return 0; -+} -+ -+ -+static struct platform_driver ltq_wdt_driver = { -+ .remove = __devexit_p(ltq_wdt_remove), -+ .driver = { -+ .name = "ltq_wdt", -+ .owner = THIS_MODULE, -+ }, -+}; -+ -+static int __init -+init_ltq_wdt(void) -+{ -+ return platform_driver_probe(<q_wdt_driver, ltq_wdt_probe); -+} -+ -+static void __exit -+exit_ltq_wdt(void) -+{ -+ return platform_driver_unregister(<q_wdt_driver); -+} -+ -+module_init(init_ltq_wdt); -+module_exit(exit_ltq_wdt); -+ -+module_param(nowayout, int, 0); -+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started"); -+ -+MODULE_AUTHOR("John Crispin <blogic@openwrt.org>"); -+MODULE_DESCRIPTION("Lantiq SoC Watchdog"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |