| Message ID | 20191018154201.1276638-9-arnd@arndb.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | ARM: pxa: towards multiplatform support | expand |
On 10/18/19 8:41 AM, Arnd Bergmann wrote: > Rather than relying on machine specific headers to > pass down the reboot status and the register locations, > use resources and platform_data. > > Aside from this, keep the changes to a minimum. > > Cc: Wim Van Sebroeck <wim@linux-watchdog.org> > Cc: Guenter Roeck <linux@roeck-us.net> > Cc: linux-watchdog@vger.kernel.org > Signed-off-by: Arnd Bergmann <arnd@arndb.de> > --- > arch/arm/mach-pxa/devices.c | 11 +++ > arch/arm/mach-pxa/include/mach/regs-ost.h | 2 + > arch/arm/mach-pxa/include/mach/reset.h | 2 +- > arch/arm/mach-pxa/pxa25x.c | 2 +- > arch/arm/mach-pxa/pxa27x.c | 2 +- > arch/arm/mach-pxa/pxa3xx.c | 2 +- > arch/arm/mach-pxa/reset.c | 3 - > arch/arm/mach-sa1100/generic.c | 6 +- > arch/arm/mach-sa1100/include/mach/reset.h | 1 - > drivers/watchdog/sa1100_wdt.c | 87 ++++++++++++++++------- > 10 files changed, 83 insertions(+), 35 deletions(-) > > diff --git a/arch/arm/mach-pxa/devices.c b/arch/arm/mach-pxa/devices.c > index 233035e6a2ff..fb9b4f6d32de 100644 > --- a/arch/arm/mach-pxa/devices.c > +++ b/arch/arm/mach-pxa/devices.c > @@ -23,6 +23,8 @@ > #include <linux/platform_data/mmp_dma.h> > #include <linux/platform_data/mtd-nand-pxa3xx.h> > > +#include <mach/regs-ost.h> > +#include <mach/reset.h> > #include "devices.h" > #include "generic.h" > > @@ -1110,3 +1112,12 @@ void __init pxa2xx_set_dmac_info(struct mmp_dma_platdata *dma_pdata) > { > pxa_register_device(&pxa2xx_pxa_dma, dma_pdata); > } > + > +void __init pxa_register_wdt(unsigned int reset_status) > +{ > + struct resource res = DEFINE_RES_MEM(OST_PHYS, OST_LEN); > + > + reset_status &= RESET_STATUS_WATCHDOG; > + platform_device_register_resndata(NULL, "sa1100_wdt", -1, &res, 1, > + &reset_status, sizeof(reset_status)); > +} > diff --git a/arch/arm/mach-pxa/include/mach/regs-ost.h b/arch/arm/mach-pxa/include/mach/regs-ost.h > index 109d0ed264df..c8001cfc8d6b 100644 > --- a/arch/arm/mach-pxa/include/mach/regs-ost.h > +++ b/arch/arm/mach-pxa/include/mach/regs-ost.h > @@ -7,6 +7,8 @@ > /* > * OS Timer & Match Registers > */ > +#define OST_PHYS 0x40A00000 > +#define OST_LEN 0x00000020 > > #define OSMR0 io_p2v(0x40A00000) /* */ > #define OSMR1 io_p2v(0x40A00004) /* */ > diff --git a/arch/arm/mach-pxa/include/mach/reset.h b/arch/arm/mach-pxa/include/mach/reset.h > index e1c4d100fd45..963dd190bc13 100644 > --- a/arch/arm/mach-pxa/include/mach/reset.h > +++ b/arch/arm/mach-pxa/include/mach/reset.h > @@ -8,8 +8,8 @@ > #define RESET_STATUS_GPIO (1 << 3) /* GPIO Reset */ > #define RESET_STATUS_ALL (0xf) > > -extern unsigned int reset_status; > extern void clear_reset_status(unsigned int mask); > +extern void pxa_register_wdt(unsigned int reset_status); > > /** > * init_gpio_reset() - register GPIO as reset generator > diff --git a/arch/arm/mach-pxa/pxa25x.c b/arch/arm/mach-pxa/pxa25x.c > index 305047ebd2f1..dfc90b41fba3 100644 > --- a/arch/arm/mach-pxa/pxa25x.c > +++ b/arch/arm/mach-pxa/pxa25x.c > @@ -240,7 +240,7 @@ static int __init pxa25x_init(void) > > if (cpu_is_pxa25x()) { > > - reset_status = RCSR; > + pxa_register_wdt(RCSR); > > pxa25x_init_pm(); > > diff --git a/arch/arm/mach-pxa/pxa27x.c b/arch/arm/mach-pxa/pxa27x.c > index a81ac88ecbfd..38fdd22c4dc5 100644 > --- a/arch/arm/mach-pxa/pxa27x.c > +++ b/arch/arm/mach-pxa/pxa27x.c > @@ -337,7 +337,7 @@ static int __init pxa27x_init(void) > > if (cpu_is_pxa27x()) { > > - reset_status = RCSR; > + pxa_register_wdt(RCSR); > > pxa27x_init_pm(); > > diff --git a/arch/arm/mach-pxa/pxa3xx.c b/arch/arm/mach-pxa/pxa3xx.c > index fc84aed99481..7c569fa2a6da 100644 > --- a/arch/arm/mach-pxa/pxa3xx.c > +++ b/arch/arm/mach-pxa/pxa3xx.c > @@ -463,7 +463,7 @@ static int __init pxa3xx_init(void) > > if (cpu_is_pxa3xx()) { > > - reset_status = ARSR; > + pxa_register_wdt(ARSR); > > /* > * clear RDH bit every time after reset > diff --git a/arch/arm/mach-pxa/reset.c b/arch/arm/mach-pxa/reset.c > index af78405aa4e9..fcb791c5ae3e 100644 > --- a/arch/arm/mach-pxa/reset.c > +++ b/arch/arm/mach-pxa/reset.c > @@ -11,9 +11,6 @@ > #include <mach/reset.h> > #include <mach/smemc.h> > > -unsigned int reset_status; > -EXPORT_SYMBOL(reset_status); > - > static void do_hw_reset(void); > > static int reset_gpio = -1; > diff --git a/arch/arm/mach-sa1100/generic.c b/arch/arm/mach-sa1100/generic.c > index 4dfb7554649d..6c21f214cd60 100644 > --- a/arch/arm/mach-sa1100/generic.c > +++ b/arch/arm/mach-sa1100/generic.c > @@ -39,9 +39,6 @@ > #include "generic.h" > #include <clocksource/pxa.h> > > -unsigned int reset_status; > -EXPORT_SYMBOL(reset_status); > - > #define NR_FREQS 16 > > /* > @@ -319,10 +316,13 @@ static struct platform_device *sa11x0_devices[] __initdata = { > > static int __init sa1100_init(void) > { > + struct resource wdt_res = DEFINE_RES_MEM(0x90000000, 0x20); > pm_power_off = sa1100_power_off; > > regulator_has_full_constraints(); > > + platform_device_register_simple("sa1100_wdt", -1, &wdt_res, 1); > + > return platform_add_devices(sa11x0_devices, ARRAY_SIZE(sa11x0_devices)); Wouldn't it be better to add the watchdog device to sa11x0_devices ? > } > > diff --git a/arch/arm/mach-sa1100/include/mach/reset.h b/arch/arm/mach-sa1100/include/mach/reset.h > index 27695650a567..a6723d45ae2a 100644 > --- a/arch/arm/mach-sa1100/include/mach/reset.h > +++ b/arch/arm/mach-sa1100/include/mach/reset.h > @@ -10,7 +10,6 @@ > #define RESET_STATUS_GPIO (1 << 3) /* GPIO Reset */ > #define RESET_STATUS_ALL (0xf) > > -extern unsigned int reset_status; > static inline void clear_reset_status(unsigned int mask) > { > RCSR = mask; > diff --git a/drivers/watchdog/sa1100_wdt.c b/drivers/watchdog/sa1100_wdt.c > index 0f6ffc1e7f4e..a24d6a07c7a7 100644 > --- a/drivers/watchdog/sa1100_wdt.c > +++ b/drivers/watchdog/sa1100_wdt.c > @@ -22,6 +22,7 @@ > #include <linux/types.h> > #include <linux/kernel.h> > #include <linux/fs.h> > +#include <linux/platform_device.h> > #include <linux/miscdevice.h> > #include <linux/watchdog.h> > #include <linux/init.h> > @@ -30,16 +31,42 @@ > #include <linux/uaccess.h> > #include <linux/timex.h> > > -#ifdef CONFIG_ARCH_PXA > -#include <mach/regs-ost.h> > -#endif > +#define REG_OSMR0 0x0000 /* OS timer Match Reg. 0 */ > +#define REG_OSMR1 0x0004 /* OS timer Match Reg. 1 */ > +#define REG_OSMR2 0x0008 /* OS timer Match Reg. 2 */ > +#define REG_OSMR3 0x000c /* OS timer Match Reg. 3 */ > +#define REG_OSCR 0x0010 /* OS timer Counter Reg. */ > +#define REG_OSSR 0x0014 /* OS timer Status Reg. */ > +#define REG_OWER 0x0018 /* OS timer Watch-dog Enable Reg. */ > +#define REG_OIER 0x001C /* OS timer Interrupt Enable Reg. */ > > -#include <mach/reset.h> > +#define OSSR_M3 (1 << 3) /* Match status channel 3 */ > +#define OSSR_M2 (1 << 2) /* Match status channel 2 */ > +#define OSSR_M1 (1 << 1) /* Match status channel 1 */ > +#define OSSR_M0 (1 << 0) /* Match status channel 0 */ > + > +#define OWER_WME (1 << 0) /* Watchdog Match Enable */ > + > +#define OIER_E3 (1 << 3) /* Interrupt enable channel 3 */ > +#define OIER_E2 (1 << 2) /* Interrupt enable channel 2 */ > +#define OIER_E1 (1 << 1) /* Interrupt enable channel 1 */ > +#define OIER_E0 (1 << 0) /* Interrupt enable channel 0 */ > > static unsigned long oscr_freq; > static unsigned long sa1100wdt_users; > static unsigned int pre_margin; > static int boot_status; > +static void __iomem *reg_base; > + > +static inline void sa1100_wr(u32 val, u32 offset) > +{ > + writel_relaxed(val, reg_base + offset); > +} > + > +static inline u32 sa1100_rd(u32 offset) > +{ > + return readl_relaxed(reg_base + offset); > +} > > /* > * Allow only one person to hold it open > @@ -50,10 +77,10 @@ static int sa1100dog_open(struct inode *inode, struct file *file) > return -EBUSY; > > /* Activate SA1100 Watchdog timer */ > - writel_relaxed(readl_relaxed(OSCR) + pre_margin, OSMR3); > - writel_relaxed(OSSR_M3, OSSR); > - writel_relaxed(OWER_WME, OWER); > - writel_relaxed(readl_relaxed(OIER) | OIER_E3, OIER); > + sa1100_wr(sa1100_rd(REG_OSCR) + pre_margin, REG_OSMR3); > + sa1100_wr(OSSR_M3, REG_OSSR); > + sa1100_wr(OWER_WME, REG_OWER); > + sa1100_wr(sa1100_rd(REG_OIER) | OIER_E3, REG_OIER); > return stream_open(inode, file); > } > > @@ -61,7 +88,7 @@ static int sa1100dog_open(struct inode *inode, struct file *file) > * The watchdog cannot be disabled. > * > * Previous comments suggested that turning off the interrupt by > - * clearing OIER[E3] would prevent the watchdog timing out but this > + * clearing REG_OIER[E3] would prevent the watchdog timing out but this > * does not appear to be true (at least on the PXA255). > */ > static int sa1100dog_release(struct inode *inode, struct file *file) > @@ -76,7 +103,7 @@ static ssize_t sa1100dog_write(struct file *file, const char __user *data, > { > if (len) > /* Refresh OSMR3 timer. */ > - writel_relaxed(readl_relaxed(OSCR) + pre_margin, OSMR3); > + sa1100_wr(sa1100_rd(REG_OSCR) + pre_margin, REG_OSMR3); > return len; > } > > @@ -110,7 +137,7 @@ static long sa1100dog_ioctl(struct file *file, unsigned int cmd, > break; > > case WDIOC_KEEPALIVE: > - writel_relaxed(readl_relaxed(OSCR) + pre_margin, OSMR3); > + sa1100_wr(sa1100_rd(REG_OSCR) + pre_margin, REG_OSMR3); > ret = 0; > break; > > @@ -125,7 +152,7 @@ static long sa1100dog_ioctl(struct file *file, unsigned int cmd, > } > > pre_margin = oscr_freq * time; > - writel_relaxed(readl_relaxed(OSCR) + pre_margin, OSMR3); > + sa1100_wr(sa1100_rd(REG_OSCR) + pre_margin, REG_OSMR3); > /*fall through*/ > > case WDIOC_GETTIMEOUT: > @@ -150,12 +177,22 @@ static struct miscdevice sa1100dog_miscdev = { > .fops = &sa1100dog_fops, > }; > > -static int margin __initdata = 60; /* (secs) Default is 1 minute */ > +static int margin = 60; /* (secs) Default is 1 minute */ > static struct clk *clk; > > -static int __init sa1100dog_init(void) > +static int sa1100dog_probe(struct platform_device *pdev) > { > int ret; > + int *platform_data; > + struct resource *res; > + > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + if (!res) > + return -ENXIO; > + reg_base = devm_ioremap(&pdev->dev, res->start, resource_size(res)); reg_base = devm_platform_ioremap_resource(pdev, 0); > + ret = PTR_ERR_OR_ZERO(reg_base); > + if (ret) > + return ret; > > clk = clk_get(NULL, "OSTIMER0"); > if (IS_ERR(clk)) { > @@ -173,13 +210,9 @@ static int __init sa1100dog_init(void) > > oscr_freq = clk_get_rate(clk); > > - /* > - * Read the reset status, and save it for later. If > - * we suspend, RCSR will be cleared, and the watchdog > - * reset reason will be lost. > - */ > - boot_status = (reset_status & RESET_STATUS_WATCHDOG) ? > - WDIOF_CARDRESET : 0; > + platform_data = pdev->dev.platform_data; > + if (platform_data && *platform_data) > + boot_status = WDIOF_CARDRESET; > pre_margin = oscr_freq * margin; > > ret = misc_register(&sa1100dog_miscdev); > @@ -195,15 +228,21 @@ static int __init sa1100dog_init(void) > return ret; > } > > -static void __exit sa1100dog_exit(void) > +static int sa1100dog_remove(struct platform_device *pdev) > { > misc_deregister(&sa1100dog_miscdev); > clk_disable_unprepare(clk); > clk_put(clk); > + > + return 0; > } > > -module_init(sa1100dog_init); > -module_exit(sa1100dog_exit); > +struct platform_driver sa1100dog_driver = { > + .driver.name = "sa1100_wdt", > + .probe = sa1100dog_probe, > + .remove = sa1100dog_remove, > +}; > +module_platform_driver(sa1100dog_driver); > > MODULE_AUTHOR("Oleg Drokin <green@crimea.edu>"); > MODULE_DESCRIPTION("SA1100/PXA2xx Watchdog"); >
On Sat, Oct 19, 2019 at 4:07 PM Guenter Roeck <linux@roeck-us.net> wrote: > > @@ -319,10 +316,13 @@ static struct platform_device *sa11x0_devices[] __initdata = { > > > > static int __init sa1100_init(void) > > { > > + struct resource wdt_res = DEFINE_RES_MEM(0x90000000, 0x20); > > pm_power_off = sa1100_power_off; > > > > regulator_has_full_constraints(); > > > > + platform_device_register_simple("sa1100_wdt", -1, &wdt_res, 1); > > + > > return platform_add_devices(sa11x0_devices, ARRAY_SIZE(sa11x0_devices)); > > Wouldn't it be better to add the watchdog device to sa11x0_devices ? Generally speaking, platform_device_register_simple() is better than platform_add_devices(), it does the same thing with fewer source lines and smaller object code, and it doesn't have the problem of lifetime rules for statically allocated reference-counted devices. One day we may want to replace all static platform_device instances with platform_device_info instead, but right now there are too many of those. I can change this one to a platform_device for consistency though if you think it's worth it. Arnd
On 10/22/19 2:44 AM, Arnd Bergmann wrote: > On Sat, Oct 19, 2019 at 4:07 PM Guenter Roeck <linux@roeck-us.net> wrote: > >>> @@ -319,10 +316,13 @@ static struct platform_device *sa11x0_devices[] __initdata = { >>> >>> static int __init sa1100_init(void) >>> { >>> + struct resource wdt_res = DEFINE_RES_MEM(0x90000000, 0x20); >>> pm_power_off = sa1100_power_off; >>> >>> regulator_has_full_constraints(); >>> >>> + platform_device_register_simple("sa1100_wdt", -1, &wdt_res, 1); >>> + >>> return platform_add_devices(sa11x0_devices, ARRAY_SIZE(sa11x0_devices)); >> >> Wouldn't it be better to add the watchdog device to sa11x0_devices ? > > Generally speaking, platform_device_register_simple() is better than > platform_add_devices(), it does the same thing with fewer source lines > and smaller object code, and it doesn't have the problem of lifetime rules > for statically allocated reference-counted devices. > > One day we may want to replace all static platform_device instances with > platform_device_info instead, but right now there are too many of those. > > I can change this one to a platform_device for consistency though if you > think it's worth it. > No, I was just wondering. Thanks for the explanation. Guenter
diff --git a/arch/arm/mach-pxa/devices.c b/arch/arm/mach-pxa/devices.c index 233035e6a2ff..fb9b4f6d32de 100644 --- a/arch/arm/mach-pxa/devices.c +++ b/arch/arm/mach-pxa/devices.c @@ -23,6 +23,8 @@ #include <linux/platform_data/mmp_dma.h> #include <linux/platform_data/mtd-nand-pxa3xx.h> +#include <mach/regs-ost.h> +#include <mach/reset.h> #include "devices.h" #include "generic.h" @@ -1110,3 +1112,12 @@ void __init pxa2xx_set_dmac_info(struct mmp_dma_platdata *dma_pdata) { pxa_register_device(&pxa2xx_pxa_dma, dma_pdata); } + +void __init pxa_register_wdt(unsigned int reset_status) +{ + struct resource res = DEFINE_RES_MEM(OST_PHYS, OST_LEN); + + reset_status &= RESET_STATUS_WATCHDOG; + platform_device_register_resndata(NULL, "sa1100_wdt", -1, &res, 1, + &reset_status, sizeof(reset_status)); +} diff --git a/arch/arm/mach-pxa/include/mach/regs-ost.h b/arch/arm/mach-pxa/include/mach/regs-ost.h index 109d0ed264df..c8001cfc8d6b 100644 --- a/arch/arm/mach-pxa/include/mach/regs-ost.h +++ b/arch/arm/mach-pxa/include/mach/regs-ost.h @@ -7,6 +7,8 @@ /* * OS Timer & Match Registers */ +#define OST_PHYS 0x40A00000 +#define OST_LEN 0x00000020 #define OSMR0 io_p2v(0x40A00000) /* */ #define OSMR1 io_p2v(0x40A00004) /* */ diff --git a/arch/arm/mach-pxa/include/mach/reset.h b/arch/arm/mach-pxa/include/mach/reset.h index e1c4d100fd45..963dd190bc13 100644 --- a/arch/arm/mach-pxa/include/mach/reset.h +++ b/arch/arm/mach-pxa/include/mach/reset.h @@ -8,8 +8,8 @@ #define RESET_STATUS_GPIO (1 << 3) /* GPIO Reset */ #define RESET_STATUS_ALL (0xf) -extern unsigned int reset_status; extern void clear_reset_status(unsigned int mask); +extern void pxa_register_wdt(unsigned int reset_status); /** * init_gpio_reset() - register GPIO as reset generator diff --git a/arch/arm/mach-pxa/pxa25x.c b/arch/arm/mach-pxa/pxa25x.c index 305047ebd2f1..dfc90b41fba3 100644 --- a/arch/arm/mach-pxa/pxa25x.c +++ b/arch/arm/mach-pxa/pxa25x.c @@ -240,7 +240,7 @@ static int __init pxa25x_init(void) if (cpu_is_pxa25x()) { - reset_status = RCSR; + pxa_register_wdt(RCSR); pxa25x_init_pm(); diff --git a/arch/arm/mach-pxa/pxa27x.c b/arch/arm/mach-pxa/pxa27x.c index a81ac88ecbfd..38fdd22c4dc5 100644 --- a/arch/arm/mach-pxa/pxa27x.c +++ b/arch/arm/mach-pxa/pxa27x.c @@ -337,7 +337,7 @@ static int __init pxa27x_init(void) if (cpu_is_pxa27x()) { - reset_status = RCSR; + pxa_register_wdt(RCSR); pxa27x_init_pm(); diff --git a/arch/arm/mach-pxa/pxa3xx.c b/arch/arm/mach-pxa/pxa3xx.c index fc84aed99481..7c569fa2a6da 100644 --- a/arch/arm/mach-pxa/pxa3xx.c +++ b/arch/arm/mach-pxa/pxa3xx.c @@ -463,7 +463,7 @@ static int __init pxa3xx_init(void) if (cpu_is_pxa3xx()) { - reset_status = ARSR; + pxa_register_wdt(ARSR); /* * clear RDH bit every time after reset diff --git a/arch/arm/mach-pxa/reset.c b/arch/arm/mach-pxa/reset.c index af78405aa4e9..fcb791c5ae3e 100644 --- a/arch/arm/mach-pxa/reset.c +++ b/arch/arm/mach-pxa/reset.c @@ -11,9 +11,6 @@ #include <mach/reset.h> #include <mach/smemc.h> -unsigned int reset_status; -EXPORT_SYMBOL(reset_status); - static void do_hw_reset(void); static int reset_gpio = -1; diff --git a/arch/arm/mach-sa1100/generic.c b/arch/arm/mach-sa1100/generic.c index 4dfb7554649d..6c21f214cd60 100644 --- a/arch/arm/mach-sa1100/generic.c +++ b/arch/arm/mach-sa1100/generic.c @@ -39,9 +39,6 @@ #include "generic.h" #include <clocksource/pxa.h> -unsigned int reset_status; -EXPORT_SYMBOL(reset_status); - #define NR_FREQS 16 /* @@ -319,10 +316,13 @@ static struct platform_device *sa11x0_devices[] __initdata = { static int __init sa1100_init(void) { + struct resource wdt_res = DEFINE_RES_MEM(0x90000000, 0x20); pm_power_off = sa1100_power_off; regulator_has_full_constraints(); + platform_device_register_simple("sa1100_wdt", -1, &wdt_res, 1); + return platform_add_devices(sa11x0_devices, ARRAY_SIZE(sa11x0_devices)); } diff --git a/arch/arm/mach-sa1100/include/mach/reset.h b/arch/arm/mach-sa1100/include/mach/reset.h index 27695650a567..a6723d45ae2a 100644 --- a/arch/arm/mach-sa1100/include/mach/reset.h +++ b/arch/arm/mach-sa1100/include/mach/reset.h @@ -10,7 +10,6 @@ #define RESET_STATUS_GPIO (1 << 3) /* GPIO Reset */ #define RESET_STATUS_ALL (0xf) -extern unsigned int reset_status; static inline void clear_reset_status(unsigned int mask) { RCSR = mask; diff --git a/drivers/watchdog/sa1100_wdt.c b/drivers/watchdog/sa1100_wdt.c index 0f6ffc1e7f4e..a24d6a07c7a7 100644 --- a/drivers/watchdog/sa1100_wdt.c +++ b/drivers/watchdog/sa1100_wdt.c @@ -22,6 +22,7 @@ #include <linux/types.h> #include <linux/kernel.h> #include <linux/fs.h> +#include <linux/platform_device.h> #include <linux/miscdevice.h> #include <linux/watchdog.h> #include <linux/init.h> @@ -30,16 +31,42 @@ #include <linux/uaccess.h> #include <linux/timex.h> -#ifdef CONFIG_ARCH_PXA -#include <mach/regs-ost.h> -#endif +#define REG_OSMR0 0x0000 /* OS timer Match Reg. 0 */ +#define REG_OSMR1 0x0004 /* OS timer Match Reg. 1 */ +#define REG_OSMR2 0x0008 /* OS timer Match Reg. 2 */ +#define REG_OSMR3 0x000c /* OS timer Match Reg. 3 */ +#define REG_OSCR 0x0010 /* OS timer Counter Reg. */ +#define REG_OSSR 0x0014 /* OS timer Status Reg. */ +#define REG_OWER 0x0018 /* OS timer Watch-dog Enable Reg. */ +#define REG_OIER 0x001C /* OS timer Interrupt Enable Reg. */ -#include <mach/reset.h> +#define OSSR_M3 (1 << 3) /* Match status channel 3 */ +#define OSSR_M2 (1 << 2) /* Match status channel 2 */ +#define OSSR_M1 (1 << 1) /* Match status channel 1 */ +#define OSSR_M0 (1 << 0) /* Match status channel 0 */ + +#define OWER_WME (1 << 0) /* Watchdog Match Enable */ + +#define OIER_E3 (1 << 3) /* Interrupt enable channel 3 */ +#define OIER_E2 (1 << 2) /* Interrupt enable channel 2 */ +#define OIER_E1 (1 << 1) /* Interrupt enable channel 1 */ +#define OIER_E0 (1 << 0) /* Interrupt enable channel 0 */ static unsigned long oscr_freq; static unsigned long sa1100wdt_users; static unsigned int pre_margin; static int boot_status; +static void __iomem *reg_base; + +static inline void sa1100_wr(u32 val, u32 offset) +{ + writel_relaxed(val, reg_base + offset); +} + +static inline u32 sa1100_rd(u32 offset) +{ + return readl_relaxed(reg_base + offset); +} /* * Allow only one person to hold it open @@ -50,10 +77,10 @@ static int sa1100dog_open(struct inode *inode, struct file *file) return -EBUSY; /* Activate SA1100 Watchdog timer */ - writel_relaxed(readl_relaxed(OSCR) + pre_margin, OSMR3); - writel_relaxed(OSSR_M3, OSSR); - writel_relaxed(OWER_WME, OWER); - writel_relaxed(readl_relaxed(OIER) | OIER_E3, OIER); + sa1100_wr(sa1100_rd(REG_OSCR) + pre_margin, REG_OSMR3); + sa1100_wr(OSSR_M3, REG_OSSR); + sa1100_wr(OWER_WME, REG_OWER); + sa1100_wr(sa1100_rd(REG_OIER) | OIER_E3, REG_OIER); return stream_open(inode, file); } @@ -61,7 +88,7 @@ static int sa1100dog_open(struct inode *inode, struct file *file) * The watchdog cannot be disabled. * * Previous comments suggested that turning off the interrupt by - * clearing OIER[E3] would prevent the watchdog timing out but this + * clearing REG_OIER[E3] would prevent the watchdog timing out but this * does not appear to be true (at least on the PXA255). */ static int sa1100dog_release(struct inode *inode, struct file *file) @@ -76,7 +103,7 @@ static ssize_t sa1100dog_write(struct file *file, const char __user *data, { if (len) /* Refresh OSMR3 timer. */ - writel_relaxed(readl_relaxed(OSCR) + pre_margin, OSMR3); + sa1100_wr(sa1100_rd(REG_OSCR) + pre_margin, REG_OSMR3); return len; } @@ -110,7 +137,7 @@ static long sa1100dog_ioctl(struct file *file, unsigned int cmd, break; case WDIOC_KEEPALIVE: - writel_relaxed(readl_relaxed(OSCR) + pre_margin, OSMR3); + sa1100_wr(sa1100_rd(REG_OSCR) + pre_margin, REG_OSMR3); ret = 0; break; @@ -125,7 +152,7 @@ static long sa1100dog_ioctl(struct file *file, unsigned int cmd, } pre_margin = oscr_freq * time; - writel_relaxed(readl_relaxed(OSCR) + pre_margin, OSMR3); + sa1100_wr(sa1100_rd(REG_OSCR) + pre_margin, REG_OSMR3); /*fall through*/ case WDIOC_GETTIMEOUT: @@ -150,12 +177,22 @@ static struct miscdevice sa1100dog_miscdev = { .fops = &sa1100dog_fops, }; -static int margin __initdata = 60; /* (secs) Default is 1 minute */ +static int margin = 60; /* (secs) Default is 1 minute */ static struct clk *clk; -static int __init sa1100dog_init(void) +static int sa1100dog_probe(struct platform_device *pdev) { int ret; + int *platform_data; + struct resource *res; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -ENXIO; + reg_base = devm_ioremap(&pdev->dev, res->start, resource_size(res)); + ret = PTR_ERR_OR_ZERO(reg_base); + if (ret) + return ret; clk = clk_get(NULL, "OSTIMER0"); if (IS_ERR(clk)) { @@ -173,13 +210,9 @@ static int __init sa1100dog_init(void) oscr_freq = clk_get_rate(clk); - /* - * Read the reset status, and save it for later. If - * we suspend, RCSR will be cleared, and the watchdog - * reset reason will be lost. - */ - boot_status = (reset_status & RESET_STATUS_WATCHDOG) ? - WDIOF_CARDRESET : 0; + platform_data = pdev->dev.platform_data; + if (platform_data && *platform_data) + boot_status = WDIOF_CARDRESET; pre_margin = oscr_freq * margin; ret = misc_register(&sa1100dog_miscdev); @@ -195,15 +228,21 @@ static int __init sa1100dog_init(void) return ret; } -static void __exit sa1100dog_exit(void) +static int sa1100dog_remove(struct platform_device *pdev) { misc_deregister(&sa1100dog_miscdev); clk_disable_unprepare(clk); clk_put(clk); + + return 0; } -module_init(sa1100dog_init); -module_exit(sa1100dog_exit); +struct platform_driver sa1100dog_driver = { + .driver.name = "sa1100_wdt", + .probe = sa1100dog_probe, + .remove = sa1100dog_remove, +}; +module_platform_driver(sa1100dog_driver); MODULE_AUTHOR("Oleg Drokin <green@crimea.edu>"); MODULE_DESCRIPTION("SA1100/PXA2xx Watchdog");
Rather than relying on machine specific headers to pass down the reboot status and the register locations, use resources and platform_data. Aside from this, keep the changes to a minimum. Cc: Wim Van Sebroeck <wim@linux-watchdog.org> Cc: Guenter Roeck <linux@roeck-us.net> Cc: linux-watchdog@vger.kernel.org Signed-off-by: Arnd Bergmann <arnd@arndb.de> --- arch/arm/mach-pxa/devices.c | 11 +++ arch/arm/mach-pxa/include/mach/regs-ost.h | 2 + arch/arm/mach-pxa/include/mach/reset.h | 2 +- arch/arm/mach-pxa/pxa25x.c | 2 +- arch/arm/mach-pxa/pxa27x.c | 2 +- arch/arm/mach-pxa/pxa3xx.c | 2 +- arch/arm/mach-pxa/reset.c | 3 - arch/arm/mach-sa1100/generic.c | 6 +- arch/arm/mach-sa1100/include/mach/reset.h | 1 - drivers/watchdog/sa1100_wdt.c | 87 ++++++++++++++++------- 10 files changed, 83 insertions(+), 35 deletions(-)