mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-19 03:08:31 +00:00
4e647e1207
A number of boards are populated with a PoP chip for both DDR and NAND memory. Other boards may simply use this as an easy way to identify board revs. So we provide a function that can be called early to reset the NAND chip and return the result of NAND_CMD_READID. All of this code is put into spl_id_nand.c and controlled via CONFIG_SPL_OMAP3_ID_NAND. Signed-off-by: Tom Rini <trini@ti.com>
87 lines
2.8 KiB
C
87 lines
2.8 KiB
C
/*
|
|
* (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);
|
|
}
|