1 files changed, 130 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..7c3a73deff24
--- /dev/null
+++ b/arch/sh/kernel/cpu/hwblk.c
@@ -0,0 +1,130 @@
+#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_inc(struct hwblk_info *info, int area)
+{
+        struct hwblk_area *hap = info->areas + area;
+
+        hap->cnt++;
+        if (hap->cnt == 1)
+                if (hap->flags & HWBLK_AREA_FLAG_PARENT)
+                        hwblk_area_inc(info, hap->parent);
+}
+
+static void hwblk_area_dec(struct hwblk_info *info, int area)
+{
+        struct hwblk_area *hap = info->areas + area;
+
+        if (hap->cnt == 1)
+                if (hap->flags & HWBLK_AREA_FLAG_PARENT)
+                        hwblk_area_dec(info, hap->parent);
+        hap->cnt--;
+}
+
+static void hwblk_enable(struct hwblk_info *info, int hwblk)
+{
+        struct hwblk *hp = info->hwblks + hwblk;
+        unsigned long tmp;
+        unsigned long flags;
+
+        spin_lock_irqsave(&hwblk_lock, flags);
+
+        hp->cnt++;
+        if (hp->cnt == 1) {
+                hwblk_area_inc(info, hp->area);
+
+                tmp = __raw_readl(hp->mstp);
+                tmp &= ~(1 << hp->bit);
+                __raw_writel(tmp, hp->mstp);
+        }
+
+        spin_unlock_irqrestore(&hwblk_lock, flags);
+}
+
+static void hwblk_disable(struct hwblk_info *info, int hwblk)
+{
+        struct hwblk *hp = info->hwblks + hwblk;
+        unsigned long tmp;
+        unsigned long flags;
+
+        spin_lock_irqsave(&hwblk_lock, flags);
+
+        if (hp->cnt == 1) {
+                hwblk_area_dec(info, hp->area);
+
+                tmp = __raw_readl(hp->mstp);
+                tmp |= 1 << hp->bit;
+                __raw_writel(tmp, hp->mstp);
+        }
+        hp->cnt--;
+
+        spin_unlock_irqrestore(&hwblk_lock, flags);
+}
+
+static 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;
+}