/* * linux/arch/arm/mach-sa1100/clock.c */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/device.h> #include <linux/list.h> #include <linux/errno.h> #include <linux/err.h> #include <linux/string.h> #include <linux/clk.h> #include <linux/spinlock.h> #include <linux/mutex.h> #include <linux/io.h> #include <linux/clkdev.h> #include <mach/hardware.h> #include <mach/generic.h> struct clkops { void (*enable)(struct clk *); void (*disable)(struct clk *); unsigned long (*get_rate)(struct clk *); }; struct clk { const struct clkops *ops; unsigned int enabled; }; #define DEFINE_CLK(_name, _ops) \ struct clk clk_##_name = { \ .ops = _ops, \ } static DEFINE_SPINLOCK(clocks_lock); static void clk_gpio27_enable(struct clk *clk) { /* * 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(struct clk *clk) { TUCR = 0; GPDR &= ~GPIO_32_768kHz; GAFR &= ~GPIO_32_768kHz; } static void clk_cpu_enable(struct clk *clk) { } static void clk_cpu_disable(struct clk *clk) { } static unsigned long clk_cpu_get_rate(struct clk *clk) { return sa11x0_getspeed(0) * 1000; } int clk_enable(struct clk *clk) { unsigned long flags; if (clk) { spin_lock_irqsave(&clocks_lock, flags); if (clk->enabled++ == 0) clk->ops->enable(clk); spin_unlock_irqrestore(&clocks_lock, flags); } return 0; } EXPORT_SYMBOL(clk_enable); void clk_disable(struct clk *clk) { unsigned long flags; if (clk) { WARN_ON(clk->enabled == 0); spin_lock_irqsave(&clocks_lock, flags); if (--clk->enabled == 0) clk->ops->disable(clk); spin_unlock_irqrestore(&clocks_lock, flags); } } EXPORT_SYMBOL(clk_disable); unsigned long clk_get_rate(struct clk *clk) { if (clk && clk->ops && clk->ops->get_rate) return clk->ops->get_rate(clk); return 0; } EXPORT_SYMBOL(clk_get_rate); const struct clkops clk_gpio27_ops = { .enable = clk_gpio27_enable, .disable = clk_gpio27_disable, }; const struct clkops clk_cpu_ops = { .enable = clk_cpu_enable, .disable = clk_cpu_disable, .get_rate = clk_cpu_get_rate, }; static DEFINE_CLK(gpio27, &clk_gpio27_ops); static DEFINE_CLK(cpu, &clk_cpu_ops); static unsigned long clk_36864_get_rate(struct clk *clk) { return 3686400; } static struct clkops clk_36864_ops = { .get_rate = clk_36864_get_rate, }; static DEFINE_CLK(36864, &clk_36864_ops); static struct clk_lookup sa11xx_clkregs[] = { CLKDEV_INIT("sa1111.0", NULL, &clk_gpio27), CLKDEV_INIT("sa1100-rtc", NULL, NULL), CLKDEV_INIT("sa11x0-fb", NULL, &clk_cpu), CLKDEV_INIT("sa11x0-pcmcia", NULL, &clk_cpu), /* sa1111 names devices using internal offsets, PCMCIA is at 0x1800 */ CLKDEV_INIT("1800", NULL, &clk_cpu), CLKDEV_INIT(NULL, "OSTIMER0", &clk_36864), }; static int __init sa11xx_clk_init(void) { clkdev_add_table(sa11xx_clkregs, ARRAY_SIZE(sa11xx_clkregs)); return 0; } core_initcall(sa11xx_clk_init);