sh: Add initial support for SH7757 CPU subtype

Signed-off-by: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 130 insertions, 0 deletions

diff --git a/arch/sh/kernel/cpu/sh4a/clock-sh7757.c b/arch/sh/kernel/cpu/sh4a/clock-sh7757.c
new file mode 100644
index 000000000000..ddc235ca9664
--- /dev/null
+++ b/arch/sh/kernel/cpu/sh4a/clock-sh7757.c
@@ -0,0 +1,130 @@
+/*
+ * arch/sh/kernel/cpu/sh4/clock-sh7757.c
+ *
+ * SH7757 support for the clock framework
+ *
+ *  Copyright (C) 2009  Renesas Solutions Corp.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <asm/clock.h>
+#include <asm/freq.h>
+
+static int ifc_divisors[] = { 2, 1, 4, 1, 1, 8, 1, 1,
+                              16, 1, 1, 32, 1, 1, 1, 1 };
+static int sfc_divisors[] = { 2, 1, 4, 1, 1, 8, 1, 1,
+                              16, 1, 1, 32, 1, 1, 1, 1 };
+static int bfc_divisors[] = { 2, 1, 4, 1, 1, 8, 1, 1,
+                              16, 1, 1, 32, 1, 1, 1, 1 };
+static int p1fc_divisors[] = { 2, 1, 4, 1, 1, 8, 1, 1,
+                               16, 1, 1, 32, 1, 1, 1, 1 };
+
+static void master_clk_init(struct clk *clk)
+{
+        clk->rate = CONFIG_SH_PCLK_FREQ * 16;
+}
+
+static struct clk_ops sh7757_master_clk_ops = {
+        .init           = master_clk_init,
+};
+
+static void module_clk_recalc(struct clk *clk)
+{
+        int idx = ctrl_inl(FRQCR) & 0x0000000f;
+        clk->rate = clk->parent->rate / p1fc_divisors[idx];
+}
+
+static struct clk_ops sh7757_module_clk_ops = {
+        .recalc         = module_clk_recalc,
+};
+
+static void bus_clk_recalc(struct clk *clk)
+{
+        int idx = (ctrl_inl(FRQCR) >> 8) & 0x0000000f;
+        clk->rate = clk->parent->rate / bfc_divisors[idx];
+}
+
+static struct clk_ops sh7757_bus_clk_ops = {
+        .recalc         = bus_clk_recalc,
+};
+
+static void cpu_clk_recalc(struct clk *clk)
+{
+        int idx = (ctrl_inl(FRQCR) >> 20) & 0x0000000f;
+        clk->rate = clk->parent->rate / ifc_divisors[idx];
+}
+
+static struct clk_ops sh7757_cpu_clk_ops = {
+        .recalc         = cpu_clk_recalc,
+};
+
+static struct clk_ops *sh7757_clk_ops[] = {
+        &sh7757_master_clk_ops,
+        &sh7757_module_clk_ops,
+        &sh7757_bus_clk_ops,
+        &sh7757_cpu_clk_ops,
+};
+
+void __init arch_init_clk_ops(struct clk_ops **ops, int idx)
+{
+        if (idx < ARRAY_SIZE(sh7757_clk_ops))
+                *ops = sh7757_clk_ops[idx];
+}
+
+static void shyway_clk_recalc(struct clk *clk)
+{
+        int idx = (ctrl_inl(FRQCR) >> 12) & 0x0000000f;
+        clk->rate = clk->parent->rate / sfc_divisors[idx];
+}
+
+static struct clk_ops sh7757_shyway_clk_ops = {
+        .recalc         = shyway_clk_recalc,
+};
+
+static struct clk sh7757_shyway_clk = {
+        .name           = "shyway_clk",
+        .flags          = CLK_ENABLE_ON_INIT,
+        .ops            = &sh7757_shyway_clk_ops,
+};
+
+/*
+ * Additional sh7757-specific on-chip clocks that aren't already part of the
+ * clock framework
+ */
+static struct clk *sh7757_onchip_clocks[] = {
+        &sh7757_shyway_clk,
+};
+
+static int __init sh7757_clk_init(void)
+{
+        struct clk *clk = clk_get(NULL, "master_clk");
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(sh7757_onchip_clocks); i++) {
+                struct clk *clkp = sh7757_onchip_clocks[i];
+
+                clkp->parent = clk;
+                clk_register(clkp);
+                clk_enable(clkp);
+        }
+
+        /*
+         * Now that we have the rest of the clocks registered, we need to
+         * force the parent clock to propagate so that these clocks will
+         * automatically figure out their rate. We cheat by handing the
+         * parent clock its current rate and forcing child propagation.
+         */
+        clk_set_rate(clk, clk_get_rate(clk));
+
+        clk_put(clk);
+
+        return 0;
+}
+
+arch_initcall(sh7757_clk_init);
+