arm/davinci: fix DDR2/mDDR memory controller initialization for Omap L138

follow section 15.2.13.1 (Initializing Following Device Power Up or Reset) of
OMAP-L138 DSP+ARM Processor Technical Reference Manual

Signed-off-by: Mikhail Kshevetskiy <mikhail.kshevetskiy@gmail.com>
Acked-by: Christian Riesch <christian.riesch@omicron.at>
Tested-by: Christian Riesch <christian.riesch@omicron.at>

diff --git a/arch/arm/cpu/arm926ejs/davinci/da850_lowlevel.c b/arch/arm/cpu/arm926ejs/davinci/da850_lowlevel.c
index df7d6a24ba2b2fc68e34ee74c5d5a0ba88d55e42..ff2e2e33dff71f9857dc12d71945f8cb4926b0fa 100644 (file)
--- a/arch/arm/cpu/arm926ejs/davinci/da850_lowlevel.c
+++ b/arch/arm/cpu/arm926ejs/davinci/da850_lowlevel.c
@@ -190,13 +190,21 @@ int da850_ddr_setup(void)
 
                setbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_LOCK);
                setbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_POWERDWN);
-
-               setbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_IOPWRDWN);
        }
-
+       setbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_IOPWRDWN);
        writel(CONFIG_SYS_DA850_DDR2_DDRPHYCR, &dv_ddr2_regs_ctrl->ddrphycr);
-       clrbits_le32(&davinci_syscfg1_regs->ddr_slew,
-               (1 << DDR_SLEW_CMOSEN_BIT));
+
+       if (CONFIG_SYS_DA850_DDR2_SDBCR & (1 << DV_DDR_SDCR_DDR2EN_SHIFT)) {
+               /* DDR2 */
+               clrbits_le32(&davinci_syscfg1_regs->ddr_slew,
+                       (1 << DDR_SLEW_DDR_PDENA_BIT) |
+                       (1 << DDR_SLEW_CMOSEN_BIT));
+       } else {
+               /* MOBILE DDR */
+               setbits_le32(&davinci_syscfg1_regs->ddr_slew,
+                       (1 << DDR_SLEW_DDR_PDENA_BIT) |
+                       (1 << DDR_SLEW_CMOSEN_BIT));
+       }
 
        /*
         * SDRAM Configuration Register (SDCR):
@@ -216,7 +224,11 @@ int da850_ddr_setup(void)
        writel(tmp, &dv_ddr2_regs_ctrl->sdbcr);
 
        /* write memory configuration and timing */
-       writel(CONFIG_SYS_DA850_DDR2_SDBCR2, &dv_ddr2_regs_ctrl->sdbcr2);
+       if (!(CONFIG_SYS_DA850_DDR2_SDBCR & (1 << DV_DDR_SDCR_DDR2EN_SHIFT))) {
+               /* MOBILE DDR only*/
+               writel(CONFIG_SYS_DA850_DDR2_SDBCR2,
+                       &dv_ddr2_regs_ctrl->sdbcr2);
+       }
        writel(CONFIG_SYS_DA850_DDR2_SDTIMR, &dv_ddr2_regs_ctrl->sdtimr);
        writel(CONFIG_SYS_DA850_DDR2_SDTIMR2, &dv_ddr2_regs_ctrl->sdtimr2);
 
@@ -240,7 +252,7 @@ int da850_ddr_setup(void)
 
        /* disable self refresh */
        clrbits_le32(&dv_ddr2_regs_ctrl->sdrcr,
-               DV_DDR_SDRCR_LPMODEN | DV_DDR_SDRCR_LPMODEN);
+               DV_DDR_SDRCR_LPMODEN | DV_DDR_SDRCR_MCLKSTOPEN);
        writel(CONFIG_SYS_DA850_DDR2_PBBPR, &dv_ddr2_regs_ctrl->pbbpr);
 
        return 0;

diff --git a/arch/arm/include/asm/arch-davinci/hardware.h b/arch/arm/include/asm/arch-davinci/hardware.h
index f6b7a2caef555fc4dea0b014b6379983003c512b..acb0fe2339fbac0a593673a2606eca40cdb33562 100644 (file)
--- a/arch/arm/include/asm/arch-davinci/hardware.h
+++ b/arch/arm/include/asm/arch-davinci/hardware.h
@@ -506,6 +506,7 @@ struct davinci_syscfg1_regs {
        ((struct davinci_syscfg1_regs *)DAVINCI_SYSCFG1_BASE)
 
 #define DDR_SLEW_CMOSEN_BIT    4
+#define DDR_SLEW_DDR_PDENA_BIT 5
 
 #define VTP_POWERDWN           (1 << 6)
 #define VTP_LOCK               (1 << 7)