sh: Add SuperH Mobile MSTPCR bits to clock framework

Handle module stop clock bits in MSTPCRn through the clock framework.
The clocks are named after the bits in the data sheet. The association
between bit number and hardware block is processor specific.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 116 insertions, 0 deletions

diff --git a/arch/sh/kernel/cpu/sh4a/clock-sh7722.c b/arch/sh/kernel/cpu/sh4a/clock-sh7722.c
index d7b14660f737..2f50f8a1f878 100644
--- a/arch/sh/kernel/cpu/sh4a/clock-sh7722.c
+++ b/arch/sh/kernel/cpu/sh4a/clock-sh7722.c
@@ -14,6 +14,7 @@
 #include <linux/kernel.h>
 #include <linux/io.h>
 #include <linux/errno.h>
+#include <linux/stringify.h>
 #include <asm/clock.h>
 #include <asm/freq.h>
 
@@ -558,6 +559,115 @@ static struct clk sh7722_video_clock = {
         .ops = &sh7722_video_clk_ops,
 };
 
+static int sh7722_mstpcr_start_stop(struct clk *clk, unsigned long reg,
+                                    int enable)
+{
+        unsigned long bit = clk->arch_flags;
+        unsigned long r;
+
+        r = ctrl_inl(reg);
+
+        if (enable)
+                r &= ~(1 << bit);
+        else
+                r |= (1 << bit);
+
+        ctrl_outl(r, reg);
+        return 0;
+}
+
+static void sh7722_mstpcr0_enable(struct clk *clk)
+{
+        sh7722_mstpcr_start_stop(clk, MSTPCR0, 1);
+}
+
+static void sh7722_mstpcr0_disable(struct clk *clk)
+{
+        sh7722_mstpcr_start_stop(clk, MSTPCR0, 0);
+}
+
+static void sh7722_mstpcr1_enable(struct clk *clk)
+{
+        sh7722_mstpcr_start_stop(clk, MSTPCR1, 1);
+}
+
+static void sh7722_mstpcr1_disable(struct clk *clk)
+{
+        sh7722_mstpcr_start_stop(clk, MSTPCR1, 0);
+}
+
+static void sh7722_mstpcr2_enable(struct clk *clk)
+{
+        sh7722_mstpcr_start_stop(clk, MSTPCR2, 1);
+}
+
+static void sh7722_mstpcr2_disable(struct clk *clk)
+{
+        sh7722_mstpcr_start_stop(clk, MSTPCR2, 0);
+}
+
+static struct clk_ops sh7722_mstpcr0_clk_ops = {
+        .enable = sh7722_mstpcr0_enable,
+        .disable = sh7722_mstpcr0_disable,
+};
+
+static struct clk_ops sh7722_mstpcr1_clk_ops = {
+        .enable = sh7722_mstpcr1_enable,
+        .disable = sh7722_mstpcr1_disable,
+};
+
+static struct clk_ops sh7722_mstpcr2_clk_ops = {
+        .enable = sh7722_mstpcr2_enable,
+        .disable = sh7722_mstpcr2_disable,
+};
+
+#define DECLARE_MSTPCRN(regnr, bitnr, bitstr)           \
+{                                                       \
+        .name = "mstp" __stringify(regnr) bitstr,       \
+        .arch_flags = bitnr,                            \
+        .ops = &sh7722_mstpcr ## regnr ## _clk_ops,     \
+}
+
+#define DECLARE_MSTPCR(regnr) \
+        DECLARE_MSTPCRN(regnr, 31, "31"), \
+        DECLARE_MSTPCRN(regnr, 30, "30"), \
+        DECLARE_MSTPCRN(regnr, 29, "29"), \
+        DECLARE_MSTPCRN(regnr, 28, "28"), \
+        DECLARE_MSTPCRN(regnr, 27, "27"), \
+        DECLARE_MSTPCRN(regnr, 26, "26"), \
+        DECLARE_MSTPCRN(regnr, 25, "25"), \
+        DECLARE_MSTPCRN(regnr, 24, "24"), \
+        DECLARE_MSTPCRN(regnr, 23, "23"), \
+        DECLARE_MSTPCRN(regnr, 22, "22"), \
+        DECLARE_MSTPCRN(regnr, 21, "21"), \
+        DECLARE_MSTPCRN(regnr, 20, "20"), \
+        DECLARE_MSTPCRN(regnr, 19, "19"), \
+        DECLARE_MSTPCRN(regnr, 18, "18"), \
+        DECLARE_MSTPCRN(regnr, 17, "17"), \
+        DECLARE_MSTPCRN(regnr, 16, "16"), \
+        DECLARE_MSTPCRN(regnr, 15, "15"), \
+        DECLARE_MSTPCRN(regnr, 14, "14"), \
+        DECLARE_MSTPCRN(regnr, 13, "13"), \
+        DECLARE_MSTPCRN(regnr, 12, "12"), \
+        DECLARE_MSTPCRN(regnr, 11, "11"), \
+        DECLARE_MSTPCRN(regnr, 10, "10"), \
+        DECLARE_MSTPCRN(regnr, 9, "09"), \
+        DECLARE_MSTPCRN(regnr, 8, "08"), \
+        DECLARE_MSTPCRN(regnr, 7, "07"), \
+        DECLARE_MSTPCRN(regnr, 6, "06"), \
+        DECLARE_MSTPCRN(regnr, 5, "05"), \
+        DECLARE_MSTPCRN(regnr, 4, "04"), \
+        DECLARE_MSTPCRN(regnr, 3, "03"), \
+        DECLARE_MSTPCRN(regnr, 2, "02"), \
+        DECLARE_MSTPCRN(regnr, 1, "01"), \
+        DECLARE_MSTPCRN(regnr, 0, "00")
+
+static struct clk sh7722_mstpcr[] = {
+        DECLARE_MSTPCR(0),
+        DECLARE_MSTPCR(1),
+        DECLARE_MSTPCR(2),
+};
+
 static struct clk *sh7722_clocks[] = {
         &sh7722_umem_clock,
         &sh7722_sh_clock,
@@ -600,5 +710,11 @@ int __init arch_clk_init(void)
                 clk_register(sh7722_clocks[i]);
         }
         clk_put(master);
+
+        for (i = 0; i < ARRAY_SIZE(sh7722_mstpcr); i++) {
+                pr_debug( "Registering mstpcr '%s'\n", sh7722_mstpcr[i].name);
+                clk_register(&sh7722_mstpcr[i]);
+        }
+
         return 0;
 }