[PATCH 4/4] ARM: kirkwood: convert orion-wdt to fdt.
Simon Guinot
simon at sequanux.org
Fri Mar 2 20:15:11 EST 2012
Hi Jason,
On Thu, Mar 01, 2012 at 06:20:55PM +0000, Jason Cooper wrote:
> Converted register address to a variable so that it could be set from
> fdt. Also, pull clock frequency from fdt and clean up failure logic a
> bit.
>
> Same as rtc-mv, this device is used in all kirkwood boards. So, it is
> placed in kirkwood.dtsi.
>
> Signed-off-by: Jason Cooper <jason at lakedaemon.net>
> ---
> arch/arm/boot/dts/kirkwood.dtsi | 6 +++++
> arch/arm/mach-kirkwood/board-dt.c | 1 -
> arch/arm/mach-kirkwood/common.c | 2 +-
> arch/arm/mach-kirkwood/common.h | 1 -
> drivers/watchdog/orion_wdt.c | 44 ++++++++++++++++++++++++++----------
> 5 files changed, 39 insertions(+), 15 deletions(-)
>
> diff --git a/arch/arm/boot/dts/kirkwood.dtsi b/arch/arm/boot/dts/kirkwood.dtsi
> index 5fb185c..bf28424 100644
> --- a/arch/arm/boot/dts/kirkwood.dtsi
> +++ b/arch/arm/boot/dts/kirkwood.dtsi
> @@ -8,5 +8,11 @@
> reg = <0xf1010300 0x1f>;
> interrupts = <53>;
> };
> +
> + wdt at fed20300 {
> + compatible = "marvell,orion-wdt";
> + reg = <0xfed20300 0x28>;
> + clock-frequency = <200000000>;
> + };
How this will work for boards using a different clock frequency (TCLK) ?
Here, we could have 166MHz for example.
Can this node be updated during the board initialization with a detected
TCLK value ?
Or maybe this clock-frequency can reference a TCLK frequency defined in
a board specific dts (I don't know if the DT format allow such things) ?
Regards,
Simon
> };
>
> diff --git a/arch/arm/mach-kirkwood/board-dt.c b/arch/arm/mach-kirkwood/board-dt.c
> index 6fc41ae..7ef5fb7 100644
> --- a/arch/arm/mach-kirkwood/board-dt.c
> +++ b/arch/arm/mach-kirkwood/board-dt.c
> @@ -135,7 +135,6 @@ static void __init kirkwood_dt_init(void)
> #endif
>
> /* internal devices that every board has */
> - kirkwood_wdt_init();
> kirkwood_xor0_init();
> kirkwood_xor1_init();
> kirkwood_crypto_init();
> diff --git a/arch/arm/mach-kirkwood/common.c b/arch/arm/mach-kirkwood/common.c
> index 0c0375f..35dc40b 100644
> --- a/arch/arm/mach-kirkwood/common.c
> +++ b/arch/arm/mach-kirkwood/common.c
> @@ -303,7 +303,7 @@ void __init kirkwood_xor1_init(void)
> /*****************************************************************************
> * Watchdog
> ****************************************************************************/
> -void __init kirkwood_wdt_init(void)
> +static void __init kirkwood_wdt_init(void)
> {
> orion_wdt_init(kirkwood_tclk);
> }
> diff --git a/arch/arm/mach-kirkwood/common.h b/arch/arm/mach-kirkwood/common.h
> index ca08826..ac4b2fb 100644
> --- a/arch/arm/mach-kirkwood/common.h
> +++ b/arch/arm/mach-kirkwood/common.h
> @@ -53,7 +53,6 @@ void kirkwood_restart(char, const char *);
>
> char *kirkwood_id(void);
> void kirkwood_l2_init(void);
> -void kirkwood_wdt_init(void);
> void kirkwood_xor0_init(void);
> void kirkwood_xor1_init(void);
> void kirkwood_crypto_init(void);
> diff --git a/drivers/watchdog/orion_wdt.c b/drivers/watchdog/orion_wdt.c
> index 4ad78f8..4be76ca 100644
> --- a/drivers/watchdog/orion_wdt.c
> +++ b/drivers/watchdog/orion_wdt.c
> @@ -17,6 +17,7 @@
> #include <linux/fs.h>
> #include <linux/miscdevice.h>
> #include <linux/platform_device.h>
> +#include <linux/of.h>
> #include <linux/watchdog.h>
> #include <linux/init.h>
> #include <linux/uaccess.h>
> @@ -28,9 +29,9 @@
> /*
> * Watchdog timer block registers.
> */
> -#define TIMER_CTRL (TIMER_VIRT_BASE + 0x0000)
> +#define TIMER_CTRL 0x0000
> #define WDT_EN 0x0010
> -#define WDT_VAL (TIMER_VIRT_BASE + 0x0024)
> +#define WDT_VAL 0x0024
>
> #define WDT_MAX_CYCLE_COUNT 0xffffffff
> #define WDT_IN_USE 0
> @@ -40,6 +41,7 @@ static int nowayout = WATCHDOG_NOWAYOUT;
> static int heartbeat = -1; /* module parameter (seconds) */
> static unsigned int wdt_max_duration; /* (seconds) */
> static unsigned int wdt_tclk;
> +static unsigned int wdt_reg;
> static unsigned long wdt_status;
> static DEFINE_SPINLOCK(wdt_lock);
>
> @@ -48,7 +50,7 @@ static void orion_wdt_ping(void)
> spin_lock(&wdt_lock);
>
> /* Reload watchdog duration */
> - writel(wdt_tclk * heartbeat, WDT_VAL);
> + writel(wdt_tclk * heartbeat, wdt_reg + WDT_VAL);
>
> spin_unlock(&wdt_lock);
> }
> @@ -60,7 +62,7 @@ static void orion_wdt_enable(void)
> spin_lock(&wdt_lock);
>
> /* Set watchdog duration */
> - writel(wdt_tclk * heartbeat, WDT_VAL);
> + writel(wdt_tclk * heartbeat, wdt_reg + WDT_VAL);
>
> /* Clear watchdog timer interrupt */
> reg = readl(BRIDGE_CAUSE);
> @@ -68,9 +70,9 @@ static void orion_wdt_enable(void)
> writel(reg, BRIDGE_CAUSE);
>
> /* Enable watchdog timer */
> - reg = readl(TIMER_CTRL);
> + reg = readl(wdt_reg + TIMER_CTRL);
> reg |= WDT_EN;
> - writel(reg, TIMER_CTRL);
> + writel(reg, wdt_reg + TIMER_CTRL);
>
> /* Enable reset on watchdog */
> reg = readl(RSTOUTn_MASK);
> @@ -92,9 +94,9 @@ static void orion_wdt_disable(void)
> writel(reg, RSTOUTn_MASK);
>
> /* Disable watchdog timer */
> - reg = readl(TIMER_CTRL);
> + reg = readl(wdt_reg + TIMER_CTRL);
> reg &= ~WDT_EN;
> - writel(reg, TIMER_CTRL);
> + writel(reg, wdt_reg + TIMER_CTRL);
>
> spin_unlock(&wdt_lock);
> }
> @@ -102,7 +104,7 @@ static void orion_wdt_disable(void)
> static int orion_wdt_get_timeleft(int *time_left)
> {
> spin_lock(&wdt_lock);
> - *time_left = readl(WDT_VAL) / wdt_tclk;
> + *time_left = readl(wdt_reg + WDT_VAL) / wdt_tclk;
> spin_unlock(&wdt_lock);
> return 0;
> }
> @@ -236,15 +238,23 @@ static struct miscdevice orion_wdt_miscdev = {
> static int __devinit orion_wdt_probe(struct platform_device *pdev)
> {
> struct orion_wdt_platform_data *pdata = pdev->dev.platform_data;
> + struct device_node *np = pdev->dev.of_node;
> int ret;
>
> - if (pdata) {
> + if (pdata)
> wdt_tclk = pdata->tclk;
> - } else {
> - printk(KERN_ERR "Orion Watchdog misses platform data\n");
> +
> + of_property_read_u32(np, "clock-frequency", &wdt_tclk);
> +
> + if (!wdt_tclk) {
> + printk(KERN_ERR "Orion Watchdog can't get clock freq\n");
> return -ENODEV;
> }
>
> + wdt_reg = TIMER_VIRT_BASE;
> +
> + of_property_read_u32(np, "reg", &wdt_reg);
> +
> if (orion_wdt_miscdev.parent)
> return -EBUSY;
> orion_wdt_miscdev.parent = &pdev->dev;
> @@ -284,6 +294,15 @@ static void orion_wdt_shutdown(struct platform_device *pdev)
> orion_wdt_disable();
> }
>
> +#ifdef CONFIG_OF
> +static struct of_device_id orion_wdt_of_match_table[] = {
> + { .compatible = "marvell,orion-wdt", },
> + {},
> +};
> +#else
> +#define orion_wdt_of_match_table NULL
> +#endif
> +
> static struct platform_driver orion_wdt_driver = {
> .probe = orion_wdt_probe,
> .remove = __devexit_p(orion_wdt_remove),
> @@ -291,6 +310,7 @@ static struct platform_driver orion_wdt_driver = {
> .driver = {
> .owner = THIS_MODULE,
> .name = "orion_wdt",
> + .of_match_table = orion_wdt_of_match_table,
> },
> };
>
> --
> 1.7.3.4
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
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