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authorJohn Crispin <blogic@openwrt.org>2012-04-12 21:21:56 +0200
committerRalf Baechle <ralf@linux-mips.org>2012-05-21 14:31:54 +0100
commitcdb8612147b7fba751e6fa193f32b09937a7e16b (patch)
treec395b2e3da6c0a8914adaf4bf82b38565442c89c /drivers/watchdog/lantiq_wdt.c
parentceff2676b04943638c6f599ffe4e99efb89aa625 (diff)
watchdog: MIPS: lantiq: implement OF support and minor fixes
Add support for OF. We also apply the following small fixes * reduce boiler plate by using devm_request_and_ioremap * sane error path for the clock * move LTQ_RST_CAUSE_WDTRST to a soc specific header file * add a message to show that the driver loaded Signed-off-by: John Crispin <blogic@openwrt.org> Acked-by: Wim Van Sebroeck <wim@iguana.be> Cc: linux-watchdog@vger.kernel.org Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/3810/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'drivers/watchdog/lantiq_wdt.c')
-rw-r--r--drivers/watchdog/lantiq_wdt.c56
1 files changed, 25 insertions, 31 deletions
diff --git a/drivers/watchdog/lantiq_wdt.c b/drivers/watchdog/lantiq_wdt.c
index a9593a3a32a0..2e74c3a8ee58 100644
--- a/drivers/watchdog/lantiq_wdt.c
+++ b/drivers/watchdog/lantiq_wdt.c
@@ -13,14 +13,15 @@
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <linux/watchdog.h>
-#include <linux/platform_device.h>
+#include <linux/of_platform.h>
#include <linux/uaccess.h>
#include <linux/clk.h>
#include <linux/io.h>
-#include <lantiq.h>
+#include <lantiq_soc.h>
-/* Section 3.4 of the datasheet
+/*
+ * 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.
*
@@ -70,7 +71,8 @@ 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
+ /*
+ * write the second password magic with no config
* this turns the watchdog off
*/
ltq_w32(LTQ_WDT_PW2, ltq_wdt_membase + LTQ_WDT_CR);
@@ -184,7 +186,7 @@ static struct miscdevice ltq_wdt_miscdev = {
.fops = &ltq_wdt_fops,
};
-static int __init
+static int __devinit
ltq_wdt_probe(struct platform_device *pdev)
{
struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -194,28 +196,27 @@ ltq_wdt_probe(struct platform_device *pdev)
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));
+
+ ltq_wdt_membase = devm_request_and_ioremap(&pdev->dev, 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);
+ clk = clk_get_io();
+ if (IS_ERR(clk)) {
+ dev_err(&pdev->dev, "Failed to get clock\n");
+ return -ENOENT;
+ }
ltq_io_region_clk_rate = clk_get_rate(clk);
clk_put(clk);
+ /* find out if the watchdog caused the last reboot */
if (ltq_reset_cause() == LTQ_RST_CAUSE_WDTRST)
ltq_wdt_bootstatus = WDIOF_CARDRESET;
+ dev_info(&pdev->dev, "Init done\n");
return misc_register(&ltq_wdt_miscdev);
}
@@ -227,33 +228,26 @@ ltq_wdt_remove(struct platform_device *pdev)
return 0;
}
+static const struct of_device_id ltq_wdt_match[] = {
+ { .compatible = "lantiq,wdt" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, ltq_wdt_match);
static struct platform_driver ltq_wdt_driver = {
+ .probe = ltq_wdt_probe,
.remove = __devexit_p(ltq_wdt_remove),
.driver = {
- .name = "ltq_wdt",
+ .name = "wdt",
.owner = THIS_MODULE,
+ .of_match_table = ltq_wdt_match,
},
};
-static int __init
-init_ltq_wdt(void)
-{
- return platform_driver_probe(&ltq_wdt_driver, ltq_wdt_probe);
-}
-
-static void __exit
-exit_ltq_wdt(void)
-{
- return platform_driver_unregister(&ltq_wdt_driver);
-}
-
-module_init(init_ltq_wdt);
-module_exit(exit_ltq_wdt);
+module_platform_driver(ltq_wdt_driver);
module_param(nowayout, bool, 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");