Merge branch 'ixp4xx-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/chris...

[pandora-kernel.git] / arch / arm / mach-omap2 / sdrc.c

diff --git a/arch/arm/mach-omap2/sdrc.c b/arch/arm/mach-omap2/sdrc.c
index 2a30060..9e3bd4f 100644 (file)
--- a/arch/arm/mach-omap2/sdrc.c
+++ b/arch/arm/mach-omap2/sdrc.c
@@ -32,39 +32,62 @@
 #include <mach/sdrc.h>
 #include "sdrc.h"
 
-static struct omap_sdrc_params *sdrc_init_params;
+static struct omap_sdrc_params *sdrc_init_params_cs0, *sdrc_init_params_cs1;
 
 void __iomem *omap2_sdrc_base;
 void __iomem *omap2_sms_base;
 
+/* SDRC_POWER register bits */
+#define SDRC_POWER_EXTCLKDIS_SHIFT             3
+#define SDRC_POWER_PWDENA_SHIFT                        2
+#define SDRC_POWER_PAGEPOLICY_SHIFT            0
 
 /**
  * omap2_sdrc_get_params - return SDRC register values for a given clock rate
  * @r: SDRC clock rate (in Hz)
+ * @sdrc_cs0: chip select 0 ram timings **
+ * @sdrc_cs1: chip select 1 ram timings **
  *
  * Return pre-calculated values for the SDRC_ACTIM_CTRLA,
- * SDRC_ACTIM_CTRLB, SDRC_RFR_CTRL, and SDRC_MR registers, for a given
- * SDRC clock rate 'r'.  These parameters control various timing
- * delays in the SDRAM controller that are expressed in terms of the
- * number of SDRC clock cycles to wait; hence the clock rate
- * dependency. Note that sdrc_init_params must be sorted rate
- * descending.  Also assumes that both chip-selects use the same
- * timing parameters.  Returns a struct omap_sdrc_params * upon
- * success, or NULL upon failure.
+ *  SDRC_ACTIM_CTRLB, SDRC_RFR_CTRL and SDRC_MR registers in sdrc_cs[01]
+ *  structs,for a given SDRC clock rate 'r'.
+ * These parameters control various timing delays in the SDRAM controller
+ *  that are expressed in terms of the number of SDRC clock cycles to
+ *  wait; hence the clock rate dependency.
+ *
+ * Supports 2 different timing parameters for both chip selects.
+ *
+ * Note 1: the sdrc_init_params_cs[01] must be sorted rate descending.
+ * Note 2: If sdrc_init_params_cs_1 is not NULL it must be of same size
+ *  as sdrc_init_params_cs_0.
+ *
+ * Fills in the struct omap_sdrc_params * for each chip select.
+ * Returns 0 upon success or -1 upon failure.
  */
-struct omap_sdrc_params *omap2_sdrc_get_params(unsigned long r)
+int omap2_sdrc_get_params(unsigned long r,
+                         struct omap_sdrc_params **sdrc_cs0,
+                         struct omap_sdrc_params **sdrc_cs1)
 {
-       struct omap_sdrc_params *sp;
+       struct omap_sdrc_params *sp0, *sp1;
+
+       if (!sdrc_init_params_cs0)
+               return -1;
 
-       sp = sdrc_init_params;
+       sp0 = sdrc_init_params_cs0;
+       sp1 = sdrc_init_params_cs1;
 
-       while (sp->rate != r)
-               sp++;
+       while (sp0->rate && sp0->rate != r) {
+               sp0++;
+               if (sdrc_init_params_cs1)
+                       sp1++;
+       }
 
-       if (!sp->rate)
-               return NULL;
+       if (!sp0->rate)
+               return -1;
 
-       return sp;
+       *sdrc_cs0 = sp0;
+       *sdrc_cs1 = sp1;
+       return 0;
 }
 
 
@@ -74,8 +97,17 @@ void __init omap2_set_globals_sdrc(struct omap_globals *omap2_globals)
        omap2_sms_base = omap2_globals->sms;
 }
 
-/* turn on smart idle modes for SDRAM scheduler and controller */
-void __init omap2_sdrc_init(struct omap_sdrc_params *sp)
+/**
+ * omap2_sdrc_init - initialize SMS, SDRC devices on boot
+ * @sdrc_cs[01]: pointers to a null-terminated list of struct omap_sdrc_params
+ *  Support for 2 chip selects timings
+ *
+ * Turn on smart idle modes for SDRAM scheduler and controller.
+ * Program a known-good configuration for the SDRC to deal with buggy
+ * bootloaders.
+ */
+void __init omap2_sdrc_init(struct omap_sdrc_params *sdrc_cs0,
+                           struct omap_sdrc_params *sdrc_cs1)
 {
        u32 l;
 
@@ -89,5 +121,15 @@ void __init omap2_sdrc_init(struct omap_sdrc_params *sp)
        l |= (0x2 << 3);
        sdrc_write_reg(l, SDRC_SYSCONFIG);
 
-       sdrc_init_params = sp;
+       sdrc_init_params_cs0 = sdrc_cs0;
+       sdrc_init_params_cs1 = sdrc_cs1;
+
+       /* XXX Enable SRFRONIDLEREQ here also? */
+       /*
+        * PWDENA should not be set due to 34xx erratum 1.150 - PWDENA
+        * can cause random memory corruption
+        */
+       l = (1 << SDRC_POWER_EXTCLKDIS_SHIFT) |
+               (1 << SDRC_POWER_PAGEPOLICY_SHIFT);
+       sdrc_write_reg(l, SDRC_POWER);
 }