This patch adds support to detect the amount of DDR2 SDRAM on PMC440 modules. Detection is done by probing through a list of available and supported hardware configurations from 256MB to 1GByte.

The static TLB entry is replaced by dynamically created entries.

Signed-off-by: Matthias Fuchs matthias.fuchs@esd.eu --- board/esd/pmc440/init.S | 13 +++---- board/esd/pmc440/sdram.c | 83 ++++++++++++++++++++++++++++++++------------- include/configs/PMC440.h | 1 - 3 files changed, 64 insertions(+), 33 deletions(-)

diff --git a/board/esd/pmc440/init.S b/board/esd/pmc440/init.S index 26a8282..da5bd8d 100644 --- a/board/esd/pmc440/init.S +++ b/board/esd/pmc440/init.S @@ -23,7 +23,7 @@ #include <asm-ppc/mmu.h> #include <config.h>

-/************************************************************************** +/* * TLB TABLE * * This table is used by the cpu boot code to setup the initial tlb @@ -32,7 +32,7 @@ * * Pointer to the table is returned in r1 * - *************************************************************************/ + */ .section .bootpg,"ax" .globl tlbtab

@@ -49,12 +49,9 @@ tlbtab: tlbentry( CONFIG_SYS_NAND_BOOT_SPL_SRC, SZ_4K, CONFIG_SYS_NAND_BOOT_SPL_SRC, 1, AC_R|AC_W|AC_X|SA_G ) #endif

- /* TLB-entry for DDR SDRAM (Up to 2GB) */ -#ifdef CONFIG_4xx_DCACHE - tlbentry( CONFIG_SYS_SDRAM_BASE, SZ_256M, CONFIG_SYS_SDRAM_BASE, 0, AC_R|AC_W|AC_X|SA_G) -#else - tlbentry( CONFIG_SYS_SDRAM_BASE, SZ_256M, CONFIG_SYS_SDRAM_BASE, 0, AC_R|AC_W|AC_X|SA_G|SA_I ) -#endif + /* TLB entries for DDR2 SDRAM are generated dynamically */ + + /* TLB-entry for DDR SDRAM are created dynamically from initdram() */

#ifdef CONFIG_SYS_INIT_RAM_DCACHE /* TLB-entry for init-ram in dcache (SA_I must be turned off!) */ diff --git a/board/esd/pmc440/sdram.c b/board/esd/pmc440/sdram.c index bb46ecc..826050c 100644 --- a/board/esd/pmc440/sdram.c +++ b/board/esd/pmc440/sdram.c @@ -1,4 +1,7 @@ /* + * (C) Copyright 2009 + * Matthias Fuchs, esd gmbh, matthias.fuchs@esd.eu + * * (C) Copyright 2006 * Sylvie Gohl, AMCC/IBM, gohl.sylvie@fr.ibm.com * Jacqueline Pira-Ferriol, AMCC/IBM, jpira-ferriol@fr.ibm.com @@ -31,33 +34,30 @@ #include <common.h> #include <asm/processor.h> #include <asm/io.h> +#include <asm/mmu.h> #include <ppc440.h>

extern int denali_wait_for_dlllock(void); extern void denali_core_search_data_eye(void);

+struct sdram_conf_s { + ulong size; + int rows; + int banks; +};

-#if defined(CONFIG_NAND_SPL) -/* Using cpu/ppc4xx/speed.c to calculate the bus frequency is too big - * for the 4k NAND boot image so define bus_frequency to 133MHz here - * which is save for the refresh counter setup. - */ -#define get_bus_freq(val) 133000000 -#endif +struct sdram_conf_s sdram_conf[] = { + {(1024 << 20), 14, 8}, /* 1GByte: 4x2GBit, 14x10, 8 banks */ + {(512 << 20), 13, 8}, /* 512MByte: 4x1GBit, 13x10, 8 banks */ + {(256 << 20), 13, 4}, /* 256MByte: 4x512MBit, 13x10, 4 banks */ +};

-/************************************************************************* - * +/* * initdram -- 440EPx's DDR controller is a DENALI Core - * - ************************************************************************/ -phys_size_t initdram (int board_type) + */ +int initdram_by_rb(int rows, int banks) { -#if !defined(CONFIG_NAND_U_BOOT) || defined(CONFIG_NAND_SPL) -#if !defined(CONFIG_NAND_SPL) ulong speed = get_bus_freq(0); -#else - ulong speed = 133333333; /* 133MHz is on the safe side */ -#endif

mtsdram(DDR0_02, 0x00000000);

@@ -89,21 +89,25 @@ phys_size_t initdram (int board_type) mtsdram(DDR0_27, 0x0000682B); mtsdram(DDR0_28, 0x00000000); mtsdram(DDR0_31, 0x00000000); - mtsdram(DDR0_42, 0x01000006); - mtsdram(DDR0_43, 0x030A0200); + + mtsdram(DDR0_42, + DDR0_42_ADDR_PINS_DECODE(14 - rows) | + 0x00000006); + mtsdram(DDR0_43, + DDR0_43_EIGHT_BANK_MODE_ENCODE(8 == banks ? 1 : 0) | + 0x030A0200); + mtsdram(DDR0_44, 0x00000003); mtsdram(DDR0_02, 0x00000001);

denali_wait_for_dlllock(); -#endif /* #ifndef CONFIG_NAND_U_BOOT */

#ifdef CONFIG_DDR_DATA_EYE - /* -----------------------------------------------------------+ + /* * Perform data eye search if requested. - * ----------------------------------------------------------*/ + */ denali_core_search_data_eye(); #endif - /* * Clear possible errors resulting from data-eye-search. * If not done, then we could get an interrupt later on when @@ -111,5 +115,36 @@ phys_size_t initdram (int board_type) */ set_mcsr(get_mcsr());

- return (CONFIG_SYS_MBYTES_SDRAM << 20); + return 0; +} + + +phys_size_t initdram (int board_type) +{ + phys_size_t size; + int n; + + /* go through supported memory configurations */ + for (n = 0; n < ARRAY_SIZE(sdram_conf); n++) { + size = sdram_conf[n].size; + + /* program TLB entries */ + program_tlb(0, CONFIG_SYS_SDRAM_BASE, size, + TLB_WORD2_I_ENABLE); + + /* + * setup denali core + */ + initdram_by_rb(sdram_conf[n].rows, + sdram_conf[n].banks); + + /* check for suitable configuration */ + if (get_ram_size(CONFIG_SYS_SDRAM_BASE, size) == size) + return size; + + /* delete TLB entries */ + remove_tlb(CONFIG_SYS_SDRAM_BASE, size); + } + + return 0; } diff --git a/include/configs/PMC440.h b/include/configs/PMC440.h index 012ae79..d6e2f6b 100644 --- a/include/configs/PMC440.h +++ b/include/configs/PMC440.h @@ -215,7 +215,6 @@ /*----------------------------------------------------------------------- * DDR SDRAM *----------------------------------------------------------------------*/ -#define CONFIG_SYS_MBYTES_SDRAM (256) /* 256MB */ #if !defined(CONFIG_NAND_U_BOOT) && !defined(CONFIG_NAND_SPL) #define CONFIG_DDR_DATA_EYE /* use DDR2 optimization */ #endif