/* * linux/arch/arm/mach-sa1100/clock.c */ #include #include #include #include #include #include #include #include #include #include #include #include #include struct clkops { void (*enable)(struct clk *); void (*disable)(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); /* Dummy clk routine to build generic kernel parts that may be using them */ unsigned long clk_get_rate(struct clk *clk) { return 0; } EXPORT_SYMBOL(clk_get_rate); 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; } 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); const struct clkops clk_gpio27_ops = { .enable = clk_gpio27_enable, .disable = clk_gpio27_disable, }; static DEFINE_CLK(gpio27, &clk_gpio27_ops); static struct clk_lookup sa11xx_clkregs[] = { CLKDEV_INIT("sa1111.0", NULL, &clk_gpio27), CLKDEV_INIT("sa1100-rtc", NULL, NULL), }; static int __init sa11xx_clk_init(void) { clkdev_add_table(sa11xx_clkregs, ARRAY_SIZE(sa11xx_clkregs)); return 0; } core_initcall(sa11xx_clk_init);