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watchdog: stm32: add pclk feature for stm32mp1

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This patch adds compatible data to manage pclk clock by
compatible. Adds stm32mp1 support which requires pclk clock.

Signed-off-by: Ludovic Barre <ludovic.barre@st.com>
Acked-by: Alexandre TORGUE <alexandre.torgue@st.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
This commit is contained in:
Ludovic Barre 2018-06-25 17:43:00 +02:00 committed by Wim Van Sebroeck
parent e454652eb2
commit c2cf466cca
1 changed files with 74 additions and 42 deletions
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116
drivers/watchdog/stm32_iwdg.c
View File

@ -11,12 +11,13 @@
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/watchdog.h>
@ -54,11 +55,15 @@
#define TIMEOUT_US 100000
#define SLEEP_US 1000
#define HAS_PCLK true
struct stm32_iwdg {
struct watchdog_device wdd;
void __iomem *regs;
struct clk *clk;
struct clk *clk_lsi;
struct clk *clk_pclk;
unsigned int rate;
bool has_pclk;
};
static inline u32 reg_read(void __iomem *base, u32 reg)
@ -133,6 +138,44 @@ static int stm32_iwdg_set_timeout(struct watchdog_device *wdd,
return 0;
}
static int stm32_iwdg_clk_init(struct platform_device *pdev,
struct stm32_iwdg *wdt)
{
u32 ret;
wdt->clk_lsi = devm_clk_get(&pdev->dev, "lsi");
if (IS_ERR(wdt->clk_lsi)) {
dev_err(&pdev->dev, "Unable to get lsi clock\n");
return PTR_ERR(wdt->clk_lsi);
}
/* optional peripheral clock */
if (wdt->has_pclk) {
wdt->clk_pclk = devm_clk_get(&pdev->dev, "pclk");
if (IS_ERR(wdt->clk_pclk)) {
dev_err(&pdev->dev, "Unable to get pclk clock\n");
return PTR_ERR(wdt->clk_pclk);
}
ret = clk_prepare_enable(wdt->clk_pclk);
if (ret) {
dev_err(&pdev->dev, "Unable to prepare pclk clock\n");
return ret;
}
}
ret = clk_prepare_enable(wdt->clk_lsi);
if (ret) {
dev_err(&pdev->dev, "Unable to prepare lsi clock\n");
clk_disable_unprepare(wdt->clk_pclk);
return ret;
}
wdt->rate = clk_get_rate(wdt->clk_lsi);
return 0;
}
static const struct watchdog_info stm32_iwdg_info = {
.options = WDIOF_SETTIMEOUT |
WDIOF_MAGICCLOSE |
@ -147,49 +190,42 @@ static const struct watchdog_ops stm32_iwdg_ops = {
.set_timeout = stm32_iwdg_set_timeout,
};
static const struct of_device_id stm32_iwdg_of_match[] = {
{ .compatible = "st,stm32-iwdg", .data = (void *)!HAS_PCLK },
{ .compatible = "st,stm32mp1-iwdg", .data = (void *)HAS_PCLK },
{ /* end node */ }
};
MODULE_DEVICE_TABLE(of, stm32_iwdg_of_match);
static int stm32_iwdg_probe(struct platform_device *pdev)
{
struct watchdog_device *wdd;
const struct of_device_id *match;
struct stm32_iwdg *wdt;
struct resource *res;
void __iomem *regs;
struct clk *clk;
int ret;
match = of_match_device(stm32_iwdg_of_match, &pdev->dev);
if (!match)
return -ENODEV;
wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
if (!wdt)
return -ENOMEM;
wdt->has_pclk = match->data;
/* This is the timer base. */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(regs)) {
wdt->regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(wdt->regs)) {
dev_err(&pdev->dev, "Could not get resource\n");
return PTR_ERR(regs);
return PTR_ERR(wdt->regs);
}
clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(clk)) {
dev_err(&pdev->dev, "Unable to get clock\n");
return PTR_ERR(clk);
}
ret = clk_prepare_enable(clk);
if (ret) {
dev_err(&pdev->dev, "Unable to prepare clock %p\n", clk);
ret = stm32_iwdg_clk_init(pdev, wdt);
if (ret)
return ret;
}
/*
* Allocate our watchdog driver data, which has the
* struct watchdog_device nested within it.
*/
wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
if (!wdt) {
ret = -ENOMEM;
goto err;
}
/* Initialize struct stm32_iwdg. */
wdt->regs = regs;
wdt->clk = clk;
wdt->rate = clk_get_rate(clk);
/* Initialize struct watchdog_device. */
wdd = &wdt->wdd;
@ -217,7 +253,8 @@ static int stm32_iwdg_probe(struct platform_device *pdev)
return 0;
err:
clk_disable_unprepare(clk);
clk_disable_unprepare(wdt->clk_lsi);
clk_disable_unprepare(wdt->clk_pclk);
return ret;
}
@ -227,23 +264,18 @@ static int stm32_iwdg_remove(struct platform_device *pdev)
struct stm32_iwdg *wdt = platform_get_drvdata(pdev);
watchdog_unregister_device(&wdt->wdd);
clk_disable_unprepare(wdt->clk);
clk_disable_unprepare(wdt->clk_lsi);
clk_disable_unprepare(wdt->clk_pclk);
return 0;
}
static const struct of_device_id stm32_iwdg_of_match[] = {
{ .compatible = "st,stm32-iwdg" },
{ /* end node */ }
};
MODULE_DEVICE_TABLE(of, stm32_iwdg_of_match);
static struct platform_driver stm32_iwdg_driver = {
.probe = stm32_iwdg_probe,
.remove = stm32_iwdg_remove,
.driver = {
.name = "iwdg",
.of_match_table = stm32_iwdg_of_match,
.of_match_table = of_match_ptr(stm32_iwdg_of_match),
},
};
module_platform_driver(stm32_iwdg_driver);