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#include <linux/clk.h>
#include <linux/compiler.h>
#include <linux/io.h>
#include <linux/spinlock.h>
#include <asm/suspend.h>
#include <asm/hwblk.h>
#include <asm/clock.h>
static DEFINE_SPINLOCK(hwblk_lock);
static void hwblk_area_mod_cnt(struct hwblk_info *info,
int area, int counter, int value, int goal)
{
struct hwblk_area *hap = info->areas + area;
hap->cnt[counter] += value;
if (hap->cnt[counter] != goal)
return;
if (hap->flags & HWBLK_AREA_FLAG_PARENT)
hwblk_area_mod_cnt(info, hap->parent, counter, value, goal);
}
static int __hwblk_mod_cnt(struct hwblk_info *info, int hwblk,
int counter, int value, int goal)
{
struct hwblk *hp = info->hwblks + hwblk;
hp->cnt[counter] += value;
if (hp->cnt[counter] == goal)
hwblk_area_mod_cnt(info, hp->area, counter, value, goal);
return hp->cnt[counter];
}
static void hwblk_mod_cnt(struct hwblk_info *info, int hwblk,
int counter, int value, int goal)
{
unsigned long flags;
spin_lock_irqsave(&hwblk_lock, flags);
__hwblk_mod_cnt(info, hwblk, counter, value, goal);
spin_unlock_irqrestore(&hwblk_lock, flags);
}
void hwblk_cnt_inc(struct hwblk_info *info, int hwblk, int counter)
{
hwblk_mod_cnt(info, hwblk, counter, 1, 1);
}
void hwblk_cnt_dec(struct hwblk_info *info, int hwblk, int counter)
{
hwblk_mod_cnt(info, hwblk, counter, -1, 0);
}
void hwblk_enable(struct hwblk_info *info, int hwblk)
{
struct hwblk *hp = info->hwblks + hwblk;
unsigned long tmp;
unsigned long flags;
int ret;
spin_lock_irqsave(&hwblk_lock, flags);
ret = __hwblk_mod_cnt(info, hwblk, HWBLK_CNT_USAGE, 1, 1);
if (ret == 1) {
tmp = __raw_readl(hp->mstp);
tmp &= ~(1 << hp->bit);
__raw_writel(tmp, hp->mstp);
}
spin_unlock_irqrestore(&hwblk_lock, flags);
}
void hwblk_disable(struct hwblk_info *info, int hwblk)
{
struct hwblk *hp = info->hwblks + hwblk;
unsigned long tmp;
unsigned long flags;
int ret;
spin_lock_irqsave(&hwblk_lock, flags);
ret = __hwblk_mod_cnt(info, hwblk, HWBLK_CNT_USAGE, -1, 0);
if (ret == 0) {
tmp = __raw_readl(hp->mstp);
tmp |= 1 << hp->bit;
__raw_writel(tmp, hp->mstp);
}
spin_unlock_irqrestore(&hwblk_lock, flags);
}
struct hwblk_info *hwblk_info;
int __init hwblk_register(struct hwblk_info *info)
{
hwblk_info = info;
return 0;
}
int __init __weak arch_hwblk_init(void)
{
return 0;
}
int __weak arch_hwblk_sleep_mode(void)
{
return SUSP_SH_SLEEP;
}
int __init hwblk_init(void)
{
return arch_hwblk_init();
}
/* allow clocks to enable and disable hardware blocks */
static int sh_hwblk_clk_enable(struct clk *clk)
{
if (!hwblk_info)
return -ENOENT;
hwblk_enable(hwblk_info, clk->arch_flags);
return 0;
}
static void sh_hwblk_clk_disable(struct clk *clk)
{
if (hwblk_info)
hwblk_disable(hwblk_info, clk->arch_flags);
}
static struct clk_ops sh_hwblk_clk_ops = {
.enable = sh_hwblk_clk_enable,
.disable = sh_hwblk_clk_disable,
.recalc = followparent_recalc,
};
int __init sh_hwblk_clk_register(struct clk *clks, int nr)
{
struct clk *clkp;
int ret = 0;
int k;
for (k = 0; !ret && (k < nr); k++) {
clkp = clks + k;
/* skip over clocks using hwblk 0 (HWBLK_UNKNOWN) */
if (!clkp->arch_flags)
continue;
clkp->ops = &sh_hwblk_clk_ops;
ret |= clk_register(clkp);
}
return ret;
}
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