ARM: mach-shmobile: clock-sh7372: Add FSIDIV clock support

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

2 files changed, 103 insertions, 0 deletions

diff --git a/arch/arm/mach-shmobile/clock-sh7372.c b/arch/arm/mach-shmobile/clock-sh7372.c
index 8565aefa21f..fe7fa1550d3 100644
--- a/arch/arm/mach-shmobile/clock-sh7372.c
+++ b/arch/arm/mach-shmobile/clock-sh7372.c
@@ -50,6 +50,9 @@
 #define SMSTPCR3        0xe615013c
 #define SMSTPCR4        0xe6150140
 
+#define FSIDIVA         0xFE1F8000
+#define FSIDIVB         0xFE1F8008
+
 /* Platforms must set frequency on their DV_CLKI pin */
 struct clk sh7372_dv_clki_clk = {
 };
@@ -417,6 +420,101 @@ static struct clk div6_reparent_clks[DIV6_REPARENT_NR] = {
                                       fsibckcr_parent, ARRAY_SIZE(fsibckcr_parent), 6, 2),
 };
 
+/* FSI DIV */
+static unsigned long fsidiv_recalc(struct clk *clk)
+{
+        unsigned long value;
+
+        value = __raw_readl(clk->mapping->base);
+
+        if ((value & 0x3) != 0x3)
+                return 0;
+
+        value >>= 16;
+        if (value < 2)
+                return 0;
+
+        return clk->parent->rate / value;
+}
+
+static long fsidiv_round_rate(struct clk *clk, unsigned long rate)
+{
+        return clk_rate_div_range_round(clk, 2, 0xffff, rate);
+}
+
+static void fsidiv_disable(struct clk *clk)
+{
+        __raw_writel(0, clk->mapping->base);
+}
+
+static int fsidiv_enable(struct clk *clk)
+{
+        unsigned long value;
+
+        value  = __raw_readl(clk->mapping->base) >> 16;
+        if (value < 2) {
+                fsidiv_disable(clk);
+                return -ENOENT;
+        }
+
+        __raw_writel((value << 16) | 0x3, clk->mapping->base);
+
+        return 0;
+}
+
+static int fsidiv_set_rate(struct clk *clk,
+                           unsigned long rate, int algo_id)
+{
+        int idx;
+
+        if (clk->parent->rate == rate) {
+                fsidiv_disable(clk);
+                return 0;
+        }
+
+        idx = (clk->parent->rate / rate) & 0xffff;
+        if (idx < 2)
+                return -ENOENT;
+
+        __raw_writel(idx << 16, clk->mapping->base);
+        return fsidiv_enable(clk);
+}
+
+static struct clk_ops fsidiv_clk_ops = {
+        .recalc         = fsidiv_recalc,
+        .round_rate     = fsidiv_round_rate,
+        .set_rate       = fsidiv_set_rate,
+        .enable         = fsidiv_enable,
+        .disable        = fsidiv_disable,
+};
+
+static struct clk_mapping sh7372_fsidiva_clk_mapping = {
+        .phys   = FSIDIVA,
+        .len    = 8,
+};
+
+struct clk sh7372_fsidiva_clk = {
+        .ops            = &fsidiv_clk_ops,
+        .parent         = &div6_reparent_clks[DIV6_FSIA], /* late install */
+        .mapping        = &sh7372_fsidiva_clk_mapping,
+};
+
+static struct clk_mapping sh7372_fsidivb_clk_mapping = {
+        .phys   = FSIDIVB,
+        .len    = 8,
+};
+
+struct clk sh7372_fsidivb_clk = {
+        .ops            = &fsidiv_clk_ops,
+        .parent         = &div6_reparent_clks[DIV6_FSIB],  /* late install */
+        .mapping        = &sh7372_fsidivb_clk_mapping,
+};
+
+static struct clk *late_main_clks[] = {
+        &sh7372_fsidiva_clk,
+        &sh7372_fsidivb_clk,
+};
+
 enum { MSTP001,
        MSTP131, MSTP130,
        MSTP129, MSTP128, MSTP127, MSTP126, MSTP125,
@@ -585,6 +683,9 @@ void __init sh7372_clock_init(void)
         if (!ret)
                 ret = sh_clk_mstp32_register(mstp_clks, MSTP_NR);
 
+        for (k = 0; !ret && (k < ARRAY_SIZE(late_main_clks)); k++)
+                ret = clk_register(late_main_clks[k]);
+
         clkdev_add_table(lookups, ARRAY_SIZE(lookups));
 
         if (!ret)
diff --git a/arch/arm/mach-shmobile/include/mach/sh7372.h b/arch/arm/mach-shmobile/include/mach/sh7372.h
index 147775a94bc..e4f9004e710 100644
--- a/arch/arm/mach-shmobile/include/mach/sh7372.h
+++ b/arch/arm/mach-shmobile/include/mach/sh7372.h
@@ -464,5 +464,7 @@ extern struct clk sh7372_dv_clki_div2_clk;
 extern struct clk sh7372_pllc2_clk;
 extern struct clk sh7372_fsiack_clk;
 extern struct clk sh7372_fsibck_clk;
+extern struct clk sh7372_fsidiva_clk;
+extern struct clk sh7372_fsidivb_clk;
 
 #endif /* __ASM_SH7372_H__ */