This patch add the capability to configure a PPC440 based IBM SDRAM Controller with static, compiled-in, values. PPC440 memory subsystem includes a Memory Queue core.
Signed-off-by: Adam Graham agraham@amcc.com Signed-off-by: Victor Gallardo vgallardo@amcc.com --- v2: - No changes. v3: - No changes.
cpu/ppc4xx/44x_spd_ddr2.c | 71 +++++++++++++++++++++++++++++++++----------- 1 files changed, 53 insertions(+), 18 deletions(-)
diff --git a/cpu/ppc4xx/44x_spd_ddr2.c b/cpu/ppc4xx/44x_spd_ddr2.c index f1d7684..735d476 100644 --- a/cpu/ppc4xx/44x_spd_ddr2.c +++ b/cpu/ppc4xx/44x_spd_ddr2.c @@ -60,6 +60,26 @@ "SDRAM_" #mnemonic, SDRAM_##mnemonic, data); \ } while (0)
+#if defined(CONFIG_440) +/* + * This DDR2 setup code can dynamically setup the TLB entries for the DDR2 + * memory region. Right now the cache should still be disabled in U-Boot + * because of the EMAC driver, that need it's buffer descriptor to be located + * in non cached memory. + * + * If at some time this restriction doesn't apply anymore, just define + * CONFIG_4xx_DCACHE in the board config file and this code should setup + * everything correctly. + */ +#ifdef CONFIG_4xx_DCACHE +/* enable caching on SDRAM */ +#define MY_TLB_WORD2_I_ENABLE 0 +#else +/* disable caching on SDRAM */ +#define MY_TLB_WORD2_I_ENABLE TLB_WORD2_I_ENABLE +#endif /* CONFIG_4xx_DCACHE */ +#endif /* CONFIG_440 */ + #if defined(CONFIG_SPD_EEPROM)
/*-----------------------------------------------------------------------------+ @@ -131,22 +151,6 @@ #define NUMLOOPS 64 /* memory test loops */
/* - * This DDR2 setup code can dynamically setup the TLB entries for the DDR2 memory - * region. Right now the cache should still be disabled in U-Boot because of the - * EMAC driver, that need it's buffer descriptor to be located in non cached - * memory. - * - * If at some time this restriction doesn't apply anymore, just define - * CONFIG_4xx_DCACHE in the board config file and this code should setup - * everything correctly. - */ -#ifdef CONFIG_4xx_DCACHE -#define MY_TLB_WORD2_I_ENABLE 0 /* enable caching on SDRAM */ -#else -#define MY_TLB_WORD2_I_ENABLE TLB_WORD2_I_ENABLE /* disable caching on SDRAM */ -#endif - -/* * Newer PPC's like 440SPe, 460EX/GT can be equipped with more than 2GB of SDRAM. * To support such configurations, we "only" map the first 2GB via the TLB's. We * need some free virtual address space for the remaining peripherals like, SoC @@ -2956,9 +2960,10 @@ static void test(void)
/*----------------------------------------------------------------------------- * Function: initdram - * Description: Configures the PPC405EX(r) DDR1/DDR2 SDRAM memory - * banks. The configuration is performed using static, compile- + * Description: Configures the PPC4xx IBM DDR1/DDR2 SDRAM memory controller. + * The configuration is performed using static, compile- * time parameters. + * Configures the PPC405EX(r) and PPC460EX/GT *---------------------------------------------------------------------------*/ phys_size_t initdram(int board_type) { @@ -2974,6 +2979,18 @@ phys_size_t initdram(int board_type) #if !defined(CONFIG_NAND_U_BOOT) || defined(CONFIG_NAND_SPL) unsigned long val;
+#if defined(CONFIG_440) + mtdcr(SDRAM_R0BAS, CFG_SDRAM_R0BAS); + mtdcr(SDRAM_R1BAS, CFG_SDRAM_R1BAS); + mtdcr(SDRAM_R2BAS, CFG_SDRAM_R2BAS); + mtdcr(SDRAM_R3BAS, CFG_SDRAM_R3BAS); + mtdcr(SDRAM_PLBADDULL, CFG_SDRAM_PLBADDULL); /* MQ0_BAUL */ + mtdcr(SDRAM_PLBADDUHB, CFG_SDRAM_PLBADDUHB); /* MQ0_BAUH */ + mtdcr(SDRAM_CONF1LL, CFG_SDRAM_CONF1LL); + mtdcr(SDRAM_CONF1HB, CFG_SDRAM_CONF1HB); + mtdcr(SDRAM_CONFPATHB, CFG_SDRAM_CONFPATHB); +#endif + /* Set Memory Bank Configuration Registers */
mtsdram(SDRAM_MB0CF, CFG_SDRAM0_MB0CF); @@ -3067,6 +3084,14 @@ phys_size_t initdram(int board_type) mfsdram(SDRAM_MCOPT2, val); mtsdram(SDRAM_MCOPT2, val | SDRAM_MCOPT2_DCEN_ENABLE);
+#if defined(CONFIG_440) + /* + * Program TLB entries with caches enabled, for best performace + * while auto-calibrating and ECC generation + */ + program_tlb(0, 0, (CFG_MBYTES_SDRAM << 20), 0); +#endif + #if defined(CONFIG_PPC4xx_DDR_AUTOCALIBRATION) #if !defined(CONFIG_NAND_U_BOOT) && !defined(CONFIG_NAND_SPL) /*------------------------------------------------------------------ @@ -3080,6 +3105,16 @@ phys_size_t initdram(int board_type) ecc_init(CFG_SDRAM_BASE, CFG_MBYTES_SDRAM << 20); #endif /* defined(CONFIG_DDR_ECC) */
+#if defined(CONFIG_440) + /* + * Now after initialization (auto-calibration and ECC generation) + * remove the TLB entries with caches enabled and program again with + * desired cache functionality + */ + remove_tlb(0, (CFG_MBYTES_SDRAM << 20)); + program_tlb(0, 0, (CFG_MBYTES_SDRAM << 20), MY_TLB_WORD2_I_ENABLE); +#endif + ppc4xx_ibm_ddr2_register_dump();
#if defined(CONFIG_PPC4xx_DDR_AUTOCALIBRATION)