diff options
| -rw-r--r-- | arch/arm/cpu/armv7/omap3/spl_id_nand.c | 32 | ||||
| -rw-r--r-- | arch/arm/include/asm/arch-omap3/sys_proto.h | 2 |
2 files changed, 15 insertions, 19 deletions
diff --git a/arch/arm/cpu/armv7/omap3/spl_id_nand.c b/arch/arm/cpu/armv7/omap3/spl_id_nand.c index db6de09..26d3aa4 100644 --- a/arch/arm/cpu/armv7/omap3/spl_id_nand.c +++ b/arch/arm/cpu/armv7/omap3/spl_id_nand.c @@ -20,29 +20,16 @@ static struct gpmc *gpmc_config = (struct gpmc *)GPMC_BASE; -/* nand_command: Send a flash command to the flash chip */ -static void nand_command(u8 command) -{ - writeb(command, &gpmc_config->cs[0].nand_cmd); - - if (command == NAND_CMD_RESET) { - unsigned char ret_val; - writeb(NAND_CMD_STATUS, &gpmc_config->cs[0].nand_cmd); - do { - /* Wait until ready */ - ret_val = readl(&gpmc_config->cs[0].nand_dat); - } while ((ret_val & NAND_STATUS_READY) != NAND_STATUS_READY); - } -} - /* * Many boards will want to know the results of the NAND_CMD_READID command * in order to decide what to do about DDR initialization. This function * allows us to do that very early and to pass those results back to the * board so it can make whatever decisions need to be made. */ -void identify_nand_chip(int *mfr, int *id) +int identify_nand_chip(int *mfr, int *id) { + int loops = 1000; + /* Make sure that we have setup GPMC for NAND correctly. */ writel(M_NAND_GPMC_CONFIG1, &gpmc_config->cs[0].config1); writel(M_NAND_GPMC_CONFIG2, &gpmc_config->cs[0].config2); @@ -62,8 +49,15 @@ void identify_nand_chip(int *mfr, int *id) sdelay(2000); /* Issue a RESET and then READID */ - nand_command(NAND_CMD_RESET); - nand_command(NAND_CMD_READID); + writeb(NAND_CMD_RESET, &gpmc_config->cs[0].nand_cmd); + writeb(NAND_CMD_STATUS, &gpmc_config->cs[0].nand_cmd); + while ((readl(&gpmc_config->cs[0].nand_dat) & NAND_STATUS_READY) + != NAND_STATUS_READY) { + sdelay(100); + if (--loops == 0) + return 1; + } + writeb(NAND_CMD_READID, &gpmc_config->cs[0].nand_cmd); /* Set the address to read to 0x0 */ writeb(0x0, &gpmc_config->cs[0].nand_adr); @@ -71,4 +65,6 @@ void identify_nand_chip(int *mfr, int *id) /* Read off the manufacturer and device id. */ *mfr = readb(&gpmc_config->cs[0].nand_dat); *id = readb(&gpmc_config->cs[0].nand_dat); + + return 0; } diff --git a/arch/arm/include/asm/arch-omap3/sys_proto.h b/arch/arm/include/asm/arch-omap3/sys_proto.h index 24563c0..1be2b15 100644 --- a/arch/arm/include/asm/arch-omap3/sys_proto.h +++ b/arch/arm/include/asm/arch-omap3/sys_proto.h @@ -40,7 +40,7 @@ void sdrc_init(void); void do_sdrc_init(u32, u32); void get_board_mem_timings(struct board_sdrc_timings *timings); -void identify_nand_chip(int *mfr, int *id); +int identify_nand_chip(int *mfr, int *id); void emif4_init(void); void gpmc_init(void); void enable_gpmc_cs_config(const u32 *gpmc_config, struct gpmc_cs *cs, u32 base, |