diff options
Diffstat (limited to 'arch/arm/cpu/armv7/omap3/spl_id_nand.c')
| -rw-r--r-- | arch/arm/cpu/armv7/omap3/spl_id_nand.c | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/omap3/spl_id_nand.c b/arch/arm/cpu/armv7/omap3/spl_id_nand.c new file mode 100644 index 0000000..0871fc9 --- /dev/null +++ b/arch/arm/cpu/armv7/omap3/spl_id_nand.c @@ -0,0 +1,87 @@ +/* + * (C) Copyright 2011 + * Texas Instruments, <www.ti.com> + * + * Author : + * Tom Rini <trini@ti.com> + * + * Initial Code from: + * Richard Woodruff <r-woodruff2@ti.com> + * Jian Zhang <jzhang@ti.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <common.h> +#include <linux/mtd/nand.h> +#include <asm/io.h> +#include <asm/arch/sys_proto.h> +#include <asm/arch/mem.h> + +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) +{ + /* 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); + writel(M_NAND_GPMC_CONFIG3, &gpmc_config->cs[0].config3); + writel(M_NAND_GPMC_CONFIG4, &gpmc_config->cs[0].config4); + writel(M_NAND_GPMC_CONFIG5, &gpmc_config->cs[0].config5); + writel(M_NAND_GPMC_CONFIG6, &gpmc_config->cs[0].config6); + + /* + * Enable the config. The CS size goes in bits 11:8. We set + * bit 6 to enable the CS and the base address goes into bits 5:0. + */ + writel((GPMC_SIZE_128M << 8) | (GPMC_CS_ENABLE << 6) | + ((NAND_BASE >> 24) & GPMC_BASEADDR_MASK), + &gpmc_config->cs[0].config7); + + sdelay(2000); + + /* Issue a RESET and then READID */ + nand_command(NAND_CMD_RESET); + nand_command(NAND_CMD_READID); + + /* Set the address to read to 0x0 */ + writeb(0x0, &gpmc_config->cs[0].nand_adr); + + /* Read off the manufacturer and device id. */ + *mfr = readb(&gpmc_config->cs[0].nand_dat); + *id = readb(&gpmc_config->cs[0].nand_dat); +} |