1 files changed, 155 insertions, 0 deletions

diff --git a/arch/sh/kernel/cpu/hwblk.c b/arch/sh/kernel/cpu/hwblk.c
new file mode 100644
index 000000000000..c0ad7d46e784
--- /dev/null
+++ b/arch/sh/kernel/cpu/hwblk.c
@@ -0,0 +1,155 @@
+#include <linux/clk.h>
+#include <linux/compiler.h>
+#include <linux/slab.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;
+		clkp->ops = &sh_hwblk_clk_ops;
+		ret |= clk_register(clkp);
+	}
+
+	return ret;
+}