13f7558237
This patch uses the ability of PXA's clocklib to alias clock to resolve the problem caused by sharing the SA1111 IO controller between PXA and SA1100 architectures, which have differing GPIO numbering. Signed-off-by: Ian Molton <spyro@f2s.com>
134 lines
2.5 KiB
C
134 lines
2.5 KiB
C
/*
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* linux/arch/arm/mach-sa1100/clock.c
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/string.h>
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#include <linux/clk.h>
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#include <linux/spinlock.h>
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#include <linux/mutex.h>
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#include <asm/hardware.h>
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/*
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* Very simple clock implementation - we only have one clock to
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* deal with at the moment, so we only match using the "name".
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*/
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struct clk {
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struct list_head node;
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unsigned long rate;
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const char *name;
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unsigned int enabled;
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void (*enable)(void);
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void (*disable)(void);
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};
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static LIST_HEAD(clocks);
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static DEFINE_MUTEX(clocks_mutex);
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static DEFINE_SPINLOCK(clocks_lock);
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struct clk *clk_get(struct device *dev, const char *id)
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{
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struct clk *p, *clk = ERR_PTR(-ENOENT);
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mutex_lock(&clocks_mutex);
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list_for_each_entry(p, &clocks, node) {
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if (strcmp(id, p->name) == 0) {
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clk = p;
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break;
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}
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}
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mutex_unlock(&clocks_mutex);
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return clk;
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}
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EXPORT_SYMBOL(clk_get);
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void clk_put(struct clk *clk)
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{
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}
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EXPORT_SYMBOL(clk_put);
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int clk_enable(struct clk *clk)
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{
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unsigned long flags;
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spin_lock_irqsave(&clocks_lock, flags);
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if (clk->enabled++ == 0)
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clk->enable();
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spin_unlock_irqrestore(&clocks_lock, flags);
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return 0;
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}
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EXPORT_SYMBOL(clk_enable);
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void clk_disable(struct clk *clk)
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{
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unsigned long flags;
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WARN_ON(clk->enabled == 0);
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spin_lock_irqsave(&clocks_lock, flags);
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if (--clk->enabled == 0)
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clk->disable();
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spin_unlock_irqrestore(&clocks_lock, flags);
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}
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EXPORT_SYMBOL(clk_disable);
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unsigned long clk_get_rate(struct clk *clk)
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{
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return clk->rate;
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}
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EXPORT_SYMBOL(clk_get_rate);
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static void clk_gpio27_enable(void)
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{
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/*
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* First, set up the 3.6864MHz clock on GPIO 27 for the SA-1111:
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* (SA-1110 Developer's Manual, section 9.1.2.1)
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*/
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GAFR |= GPIO_32_768kHz;
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GPDR |= GPIO_32_768kHz;
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TUCR = TUCR_3_6864MHz;
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}
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static void clk_gpio27_disable(void)
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{
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TUCR = 0;
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GPDR &= ~GPIO_32_768kHz;
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GAFR &= ~GPIO_32_768kHz;
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}
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static struct clk clk_gpio27 = {
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.name = "SA1111_CLK",
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.rate = 3686400,
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.enable = clk_gpio27_enable,
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.disable = clk_gpio27_disable,
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};
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int clk_register(struct clk *clk)
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{
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mutex_lock(&clocks_mutex);
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list_add(&clk->node, &clocks);
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mutex_unlock(&clocks_mutex);
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return 0;
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}
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EXPORT_SYMBOL(clk_register);
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void clk_unregister(struct clk *clk)
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{
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mutex_lock(&clocks_mutex);
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list_del(&clk->node);
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mutex_unlock(&clocks_mutex);
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}
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EXPORT_SYMBOL(clk_unregister);
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static int __init clk_init(void)
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{
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clk_register(&clk_gpio27);
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return 0;
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}
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arch_initcall(clk_init);
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