From: Russell King Date: Wed, 15 Mar 2006 15:54:37 +0000 (+0000) Subject: [ARM] Convert SA1111 to use clock architecture X-Git-Tag: v2.6.17-rc1~1122^2~37 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=97d654f8eb4b8fbb6e1afef076429a4235a3a3ad;p=linux-2.6 [ARM] Convert SA1111 to use clock architecture Signed-off-by: Russell King --- diff --git a/arch/arm/common/sa1111.c b/arch/arm/common/sa1111.c index 93352f6097..5ba1ee0423 100644 --- a/arch/arm/common/sa1111.c +++ b/arch/arm/common/sa1111.c @@ -26,6 +26,7 @@ #include #include #include +#include #include #include @@ -36,10 +37,6 @@ #include -#ifdef CONFIG_ARCH_PXA -#include -#endif - extern void __init sa1110_mb_enable(void); /* @@ -51,6 +48,7 @@ extern void __init sa1110_mb_enable(void); */ struct sa1111 { struct device *dev; + struct clk *clk; unsigned long phys; int irq; spinlock_t lock; @@ -451,19 +449,7 @@ static void sa1111_wake(struct sa1111 *sachip) spin_lock_irqsave(&sachip->lock, flags); -#ifdef CONFIG_ARCH_SA1100 - /* - * First, set up the 3.6864MHz clock on GPIO 27 for the SA-1111: - * (SA-1110 Developer's Manual, section 9.1.2.1) - */ - GAFR |= GPIO_32_768kHz; - GPDR |= GPIO_32_768kHz; - TUCR = TUCR_3_6864MHz; -#elif CONFIG_ARCH_PXA - pxa_gpio_mode(GPIO11_3_6MHz_MD); -#else -#error missing clock setup -#endif + clk_enable(sachip->clk); /* * Turn VCO on, and disable PLL Bypass. @@ -641,6 +627,12 @@ __sa1111_probe(struct device *me, struct resource *mem, int irq) memset(sachip, 0, sizeof(struct sa1111)); + sachip->clk = clk_get(me, "GPIO27_CLK"); + if (!sachip->clk) { + ret = PTR_ERR(sachip->clk); + goto err_free; + } + spin_lock_init(&sachip->lock); sachip->dev = me; @@ -656,7 +648,7 @@ __sa1111_probe(struct device *me, struct resource *mem, int irq) sachip->base = ioremap(mem->start, PAGE_SIZE * 2); if (!sachip->base) { ret = -ENOMEM; - goto out; + goto err_clkput; } /* @@ -666,7 +658,7 @@ __sa1111_probe(struct device *me, struct resource *mem, int irq) if ((id & SKID_ID_MASK) != SKID_SA1111_ID) { printk(KERN_DEBUG "SA1111 not detected: ID = %08lx\n", id); ret = -ENODEV; - goto unmap; + goto err_unmap; } printk(KERN_INFO "SA1111 Microprocessor Companion Chip: " @@ -726,9 +718,11 @@ __sa1111_probe(struct device *me, struct resource *mem, int irq) return 0; - unmap: + err_unmap: iounmap(sachip->base); - out: + err_clkput: + clk_put(sachip->clk); + err_free: kfree(sachip); return ret; } @@ -751,6 +745,8 @@ static void __sa1111_remove(struct sa1111 *sachip) sa1111_writel(0, irqbase + SA1111_WAKEEN0); sa1111_writel(0, irqbase + SA1111_WAKEEN1); + clk_disable(sachip->clk); + if (sachip->irq != NO_IRQ) { set_irq_chained_handler(sachip->irq, NULL); set_irq_data(sachip->irq, NULL); @@ -759,6 +755,7 @@ static void __sa1111_remove(struct sa1111 *sachip) } iounmap(sachip->base); + clk_put(sachip->clk); kfree(sachip); } @@ -857,6 +854,8 @@ static int sa1111_suspend(struct platform_device *dev, pm_message_t state) sa1111_writel(0, sachip->base + SA1111_SKPWM0); sa1111_writel(0, sachip->base + SA1111_SKPWM1); + clk_disable(sachip->clk); + spin_unlock_irqrestore(&sachip->lock, flags); return 0; diff --git a/arch/arm/mach-pxa/Makefile b/arch/arm/mach-pxa/Makefile index 32526a0a6f..382644401a 100644 --- a/arch/arm/mach-pxa/Makefile +++ b/arch/arm/mach-pxa/Makefile @@ -3,7 +3,7 @@ # # Common support (must be linked before board specific support) -obj-y += generic.o irq.o dma.o time.o +obj-y += clock.o generic.o irq.o dma.o time.o obj-$(CONFIG_PXA25x) += pxa25x.o obj-$(CONFIG_PXA27x) += pxa27x.o diff --git a/arch/arm/mach-pxa/clock.c b/arch/arm/mach-pxa/clock.c new file mode 100644 index 0000000000..8f7c90a059 --- /dev/null +++ b/arch/arm/mach-pxa/clock.c @@ -0,0 +1,124 @@ +/* + * linux/arch/arm/mach-sa1100/clock.c + */ +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +struct clk { + struct list_head node; + unsigned long rate; + struct module *owner; + const char *name; + unsigned int enabled; + void (*enable)(void); + void (*disable)(void); +}; + +static LIST_HEAD(clocks); +static DECLARE_MUTEX(clocks_sem); +static DEFINE_SPINLOCK(clocks_lock); + +struct clk *clk_get(struct device *dev, const char *id) +{ + struct clk *p, *clk = ERR_PTR(-ENOENT); + + down(&clocks_sem); + list_for_each_entry(p, &clocks, node) { + if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) { + clk = p; + break; + } + } + up(&clocks_sem); + + return clk; +} +EXPORT_SYMBOL(clk_get); + +void clk_put(struct clk *clk) +{ + module_put(clk->owner); +} +EXPORT_SYMBOL(clk_put); + +int clk_enable(struct clk *clk) +{ + unsigned long flags; + + spin_lock_irqsave(&clocks_lock, flags); + if (clk->enabled++ == 0) + clk->enable(); + spin_unlock_irqrestore(&clocks_lock, flags); + return 0; +} +EXPORT_SYMBOL(clk_enable); + +void clk_disable(struct clk *clk) +{ + unsigned long flags; + + WARN_ON(clk->enabled == 0); + + spin_lock_irqsave(&clocks_lock, flags); + if (--clk->enabled == 0) + clk->disable(); + spin_unlock_irqrestore(&clocks_lock, flags); +} +EXPORT_SYMBOL(clk_disable); + +unsigned long clk_get_rate(struct clk *clk) +{ + return clk->rate; +} +EXPORT_SYMBOL(clk_get_rate); + + +static void clk_gpio27_enable(void) +{ + pxa_gpio_mode(GPIO11_3_6MHz_MD); +} + +static void clk_gpio27_disable(void) +{ +} + +static struct clk clk_gpio27 = { + .name = "GPIO27_CLK", + .rate = 3686400, + .enable = clk_gpio27_enable, + .disable = clk_gpio27_disable, +}; + +int clk_register(struct clk *clk) +{ + down(&clocks_sem); + list_add(&clk->node, &clocks); + up(&clocks_sem); + return 0; +} +EXPORT_SYMBOL(clk_register); + +void clk_unregister(struct clk *clk) +{ + down(&clocks_sem); + list_del(&clk->node); + up(&clocks_sem); +} +EXPORT_SYMBOL(clk_unregister); + +static int __init clk_init(void) +{ + clk_register(&clk_gpio27); + return 0; +} +arch_initcall(clk_init); diff --git a/arch/arm/mach-sa1100/Makefile b/arch/arm/mach-sa1100/Makefile index e4a4a3e8aa..e27f15042a 100644 --- a/arch/arm/mach-sa1100/Makefile +++ b/arch/arm/mach-sa1100/Makefile @@ -3,7 +3,7 @@ # # Common support -obj-y := generic.o irq.o dma.o time.o +obj-y := clock.o generic.o irq.o dma.o time.o #nmi-oopser.o obj-m := obj-n := obj- := diff --git a/arch/arm/mach-sa1100/clock.c b/arch/arm/mach-sa1100/clock.c new file mode 100644 index 0000000000..b1e8fd766c --- /dev/null +++ b/arch/arm/mach-sa1100/clock.c @@ -0,0 +1,132 @@ +/* + * linux/arch/arm/mach-sa1100/clock.c + */ +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +struct clk { + struct list_head node; + unsigned long rate; + struct module *owner; + const char *name; + unsigned int enabled; + void (*enable)(void); + void (*disable)(void); +}; + +static LIST_HEAD(clocks); +static DECLARE_MUTEX(clocks_sem); +static DEFINE_SPINLOCK(clocks_lock); + +struct clk *clk_get(struct device *dev, const char *id) +{ + struct clk *p, *clk = ERR_PTR(-ENOENT); + + down(&clocks_sem); + list_for_each_entry(p, &clocks, node) { + if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) { + clk = p; + break; + } + } + up(&clocks_sem); + + return clk; +} +EXPORT_SYMBOL(clk_get); + +void clk_put(struct clk *clk) +{ + module_put(clk->owner); +} +EXPORT_SYMBOL(clk_put); + +int clk_enable(struct clk *clk) +{ + unsigned long flags; + + spin_lock_irqsave(&clocks_lock, flags); + if (clk->enabled++ == 0) + clk->enable(); + spin_unlock_irqrestore(&clocks_lock, flags); + return 0; +} +EXPORT_SYMBOL(clk_enable); + +void clk_disable(struct clk *clk) +{ + unsigned long flags; + + WARN_ON(clk->enabled == 0); + + spin_lock_irqsave(&clocks_lock, flags); + if (--clk->enabled == 0) + clk->disable(); + spin_unlock_irqrestore(&clocks_lock, flags); +} +EXPORT_SYMBOL(clk_disable); + +unsigned long clk_get_rate(struct clk *clk) +{ + return clk->rate; +} +EXPORT_SYMBOL(clk_get_rate); + + +static void clk_gpio27_enable(void) +{ + /* + * First, set up the 3.6864MHz clock on GPIO 27 for the SA-1111: + * (SA-1110 Developer's Manual, section 9.1.2.1) + */ + GAFR |= GPIO_32_768kHz; + GPDR |= GPIO_32_768kHz; + TUCR = TUCR_3_6864MHz; +} + +static void clk_gpio27_disable(void) +{ + TUCR = 0; + GPDR &= ~GPIO_32_768kHz; + GAFR &= ~GPIO_32_768kHz; +} + +static struct clk clk_gpio27 = { + .name = "GPIO27_CLK", + .rate = 3686400, + .enable = clk_gpio27_enable, + .disable = clk_gpio27_disable, +}; + +int clk_register(struct clk *clk) +{ + down(&clocks_sem); + list_add(&clk->node, &clocks); + up(&clocks_sem); + return 0; +} +EXPORT_SYMBOL(clk_register); + +void clk_unregister(struct clk *clk) +{ + down(&clocks_sem); + list_del(&clk->node); + up(&clocks_sem); +} +EXPORT_SYMBOL(clk_unregister); + +static int __init clk_init(void) +{ + clk_register(&clk_gpio27); + return 0; +} +arch_initcall(clk_init);