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Diffstat (limited to 'arch/arm/mach-omap2/io.c')
-rw-r--r--arch/arm/mach-omap2/io.c41
1 files changed, 39 insertions, 2 deletions
diff --git a/arch/arm/mach-omap2/io.c b/arch/arm/mach-omap2/io.c
index 32afd9448216..e9b9bcb19b4e 100644
--- a/arch/arm/mach-omap2/io.c
+++ b/arch/arm/mach-omap2/io.c
@@ -21,6 +21,7 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
+#include <linux/clk.h>
#include <asm/tlb.h>
@@ -241,14 +242,50 @@ void __init omap2_map_common_io(void)
omapfb_reserve_sdram();
}
-void __init omap2_init_common_hw(struct omap_sdrc_params *sp)
+/*
+ * omap2_init_reprogram_sdrc - reprogram SDRC timing parameters
+ *
+ * Sets the CORE DPLL3 M2 divider to the same value that it's at
+ * currently. This has the effect of setting the SDRC SDRAM AC timing
+ * registers to the values currently defined by the kernel. Currently
+ * only defined for OMAP3; will return 0 if called on OMAP2. Returns
+ * -EINVAL if the dpll3_m2_ck cannot be found, 0 if called on OMAP2,
+ * or passes along the return value of clk_set_rate().
+ */
+static int __init _omap2_init_reprogram_sdrc(void)
+{
+ struct clk *dpll3_m2_ck;
+ int v = -EINVAL;
+ long rate;
+
+ if (!cpu_is_omap34xx())
+ return 0;
+
+ dpll3_m2_ck = clk_get(NULL, "dpll3_m2_ck");
+ if (!dpll3_m2_ck)
+ return -EINVAL;
+
+ rate = clk_get_rate(dpll3_m2_ck);
+ pr_info("Reprogramming SDRC clock to %ld Hz\n", rate);
+ v = clk_set_rate(dpll3_m2_ck, rate);
+ if (v)
+ pr_err("dpll3_m2_clk rate change failed: %d\n", v);
+
+ clk_put(dpll3_m2_ck);
+
+ return v;
+}
+
+void __init omap2_init_common_hw(struct omap_sdrc_params *sdrc_cs0,
+ struct omap_sdrc_params *sdrc_cs1)
{
omap2_mux_init();
#ifndef CONFIG_ARCH_OMAP4 /* FIXME: Remove this once the clkdev is ready */
pwrdm_init(powerdomains_omap);
clkdm_init(clockdomains_omap, clkdm_pwrdm_autodeps);
omap2_clk_init();
- omap2_sdrc_init(sp);
+ omap2_sdrc_init(sdrc_cs0, sdrc_cs1);
+ _omap2_init_reprogram_sdrc();
#endif
gpmc_init();
}