2 files changed, 69 insertions, 5 deletions

diff --git a/arch/arm/mach-omap2/clock34xx.c b/arch/arm/mach-omap2/clock34xx.c
index 52385b1506e0..1ad0a1359cb8 100644
--- a/arch/arm/mach-omap2/clock34xx.c
+++ b/arch/arm/mach-omap2/clock34xx.c
@@ -634,6 +634,71 @@ static int omap3_dpll4_set_rate(struct clk *clk, unsigned long rate)
         return omap3_noncore_dpll_set_rate(clk, rate);
 }
 
+
+/*
+ * CORE DPLL (DPLL3) rate programming functions
+ *
+ * These call into SRAM code to do the actual CM writes, since the SDRAM
+ * is clocked from DPLL3.
+ */
+
+/**
+ * omap3_core_dpll_m2_set_rate - set CORE DPLL M2 divider
+ * @clk: struct clk * of DPLL to set
+ * @rate: rounded target rate
+ *
+ * Program the DPLL M2 divider with the rounded target rate.  Returns
+ * -EINVAL upon error, or 0 upon success.
+ */
+static int omap3_core_dpll_m2_set_rate(struct clk *clk, unsigned long rate)
+{
+        u32 new_div = 0;
+        unsigned long validrate, sdrcrate;
+        struct omap_sdrc_params *sp;
+
+        if (!clk || !rate)
+                return -EINVAL;
+
+        if (clk != &dpll3_m2_ck)
+                return -EINVAL;
+
+        if (rate == clk->rate)
+                return 0;
+
+        validrate = omap2_clksel_round_rate_div(clk, rate, &new_div);
+        if (validrate != rate)
+                return -EINVAL;
+
+        sdrcrate = sdrc_ick.rate;
+        if (rate > clk->rate)
+                sdrcrate <<= ((rate / clk->rate) - 1);
+        else
+                sdrcrate >>= ((clk->rate / rate) - 1);
+
+        sp = omap2_sdrc_get_params(sdrcrate);
+        if (!sp)
+                return -EINVAL;
+
+        pr_info("clock: changing CORE DPLL rate from %lu to %lu\n", clk->rate,
+                validrate);
+        pr_info("clock: SDRC timing params used: %08x %08x %08x\n",
+                sp->rfr_ctrl, sp->actim_ctrla, sp->actim_ctrlb);
+
+        /* REVISIT: SRAM code doesn't support other M2 divisors yet */
+        WARN_ON(new_div != 1 && new_div != 2);
+
+        /* REVISIT: Add SDRC_MR changing to this code also */
+        local_irq_disable();
+        omap3_configure_core_dpll(sp->rfr_ctrl, sp->actim_ctrla,
+                                  sp->actim_ctrlb, new_div);
+        local_irq_enable();
+
+        omap2_clksel_recalc(clk);
+
+        return 0;
+}
+
+
 static const struct clkops clkops_noncore_dpll_ops = {
         .enable         = &omap3_noncore_dpll_enable,
         .disable        = &omap3_noncore_dpll_disable,
diff --git a/arch/arm/mach-omap2/clock34xx.h b/arch/arm/mach-omap2/clock34xx.h
index aadd296c05a2..681acf0427c1 100644
--- a/arch/arm/mach-omap2/clock34xx.h
+++ b/arch/arm/mach-omap2/clock34xx.h
@@ -34,6 +34,7 @@ static void omap3_dpll_deny_idle(struct clk *clk);
 static u32 omap3_dpll_autoidle_read(struct clk *clk);
 static int omap3_noncore_dpll_set_rate(struct clk *clk, unsigned long rate);
 static int omap3_dpll4_set_rate(struct clk *clk, unsigned long rate);
+static int omap3_core_dpll_m2_set_rate(struct clk *clk, unsigned long rate);
 
 /* Maximum DPLL multiplier, divider values for OMAP3 */
 #define OMAP3_MAX_DPLL_MULT             2048
@@ -471,11 +472,7 @@ static const struct clksel div31_dpll3m2_clksel[] = {
         { .parent = NULL }
 };
 
-/*
- * DPLL3 output M2
- * REVISIT: This DPLL output divider must be changed in SRAM, so until
- * that code is ready, this should remain a 'read-only' clksel clock.
- */
+/* DPLL3 output M2 - primary control point for CORE speed */
 static struct clk dpll3_m2_ck = {
         .name           = "dpll3_m2_ck",
         .ops            = &clkops_null,
@@ -486,6 +483,8 @@ static struct clk dpll3_m2_ck = {
         .clksel         = div31_dpll3m2_clksel,
         .flags          = RATE_PROPAGATES,
         .clkdm_name     = "dpll3_clkdm",
+        .round_rate     = &omap2_clksel_round_rate,
+        .set_rate       = &omap3_core_dpll_m2_set_rate,
         .recalc         = &omap2_clksel_recalc,
 };