mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-21 03:33:59 +08:00
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>
128 lines
2.3 KiB
C
128 lines
2.3 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/platform_device.h>
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#include <linux/delay.h>
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#include <asm/arch/pxa2xx-regs.h>
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#include <asm/arch/pxa2xx-gpio.h>
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#include <asm/hardware.h>
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#include "devices.h"
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#include "generic.h"
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#include "clock.h"
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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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static struct clk *clk_lookup(struct device *dev, const char *id)
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{
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struct clk *p;
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list_for_each_entry(p, &clocks, node)
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if (strcmp(id, p->name) == 0 && p->dev == dev)
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return p;
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return NULL;
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}
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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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p = clk_lookup(dev, id);
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if (!p)
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p = clk_lookup(NULL, id);
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if (p)
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clk = p;
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mutex_unlock(&clocks_mutex);
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if (!IS_ERR(clk) && clk->ops == NULL)
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clk = clk->other;
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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->ops->enable(clk);
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spin_unlock_irqrestore(&clocks_lock, flags);
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if (clk->delay)
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udelay(clk->delay);
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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->ops->disable(clk);
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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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unsigned long rate;
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rate = clk->rate;
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if (clk->ops->getrate)
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rate = clk->ops->getrate(clk);
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return rate;
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}
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EXPORT_SYMBOL(clk_get_rate);
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void clk_cken_enable(struct clk *clk)
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{
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CKEN |= 1 << clk->cken;
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}
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void clk_cken_disable(struct clk *clk)
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{
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CKEN &= ~(1 << clk->cken);
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}
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const struct clkops clk_cken_ops = {
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.enable = clk_cken_enable,
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.disable = clk_cken_disable,
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};
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void clks_register(struct clk *clks, size_t num)
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{
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int i;
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mutex_lock(&clocks_mutex);
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for (i = 0; i < num; i++)
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list_add(&clks[i].node, &clocks);
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mutex_unlock(&clocks_mutex);
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}
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