]>
Commit | Line | Data |
---|---|---|
4e647e12 TR |
1 | /* |
2 | * (C) Copyright 2011 | |
3 | * Texas Instruments, <www.ti.com> | |
4 | * | |
5 | * Author : | |
6 | * Tom Rini <trini@ti.com> | |
7 | * | |
8 | * Initial Code from: | |
9 | * Richard Woodruff <r-woodruff2@ti.com> | |
10 | * Jian Zhang <jzhang@ti.com> | |
11 | * | |
1a459660 | 12 | * SPDX-License-Identifier: GPL-2.0+ |
4e647e12 TR |
13 | */ |
14 | ||
15 | #include <common.h> | |
9a9d3946 | 16 | #include <jffs2/load_kernel.h> |
6ae3900a | 17 | #include <linux/mtd/rawnand.h> |
9a9d3946 | 18 | #include <linux/mtd/omap_gpmc.h> |
4e647e12 TR |
19 | #include <asm/io.h> |
20 | #include <asm/arch/sys_proto.h> | |
21 | #include <asm/arch/mem.h> | |
22 | ||
4e647e12 TR |
23 | /* |
24 | * Many boards will want to know the results of the NAND_CMD_READID command | |
25 | * in order to decide what to do about DDR initialization. This function | |
26 | * allows us to do that very early and to pass those results back to the | |
27 | * board so it can make whatever decisions need to be made. | |
28 | */ | |
b1509e3a | 29 | int identify_nand_chip(int *mfr, int *id) |
4e647e12 | 30 | { |
b1509e3a LM |
31 | int loops = 1000; |
32 | ||
4e647e12 | 33 | /* Make sure that we have setup GPMC for NAND correctly. */ |
9a9d3946 | 34 | set_gpmc_cs0(MTD_DEV_TYPE_NAND); |
4e647e12 TR |
35 | |
36 | sdelay(2000); | |
37 | ||
38 | /* Issue a RESET and then READID */ | |
9a9d3946 LM |
39 | writeb(NAND_CMD_RESET, &gpmc_cfg->cs[0].nand_cmd); |
40 | writeb(NAND_CMD_STATUS, &gpmc_cfg->cs[0].nand_cmd); | |
41 | while ((readl(&gpmc_cfg->cs[0].nand_dat) & NAND_STATUS_READY) | |
42 | != NAND_STATUS_READY) { | |
b1509e3a LM |
43 | sdelay(100); |
44 | if (--loops == 0) | |
45 | return 1; | |
46 | } | |
9a9d3946 | 47 | writeb(NAND_CMD_READID, &gpmc_cfg->cs[0].nand_cmd); |
4e647e12 TR |
48 | |
49 | /* Set the address to read to 0x0 */ | |
9a9d3946 | 50 | writeb(0x0, &gpmc_cfg->cs[0].nand_adr); |
4e647e12 TR |
51 | |
52 | /* Read off the manufacturer and device id. */ | |
9a9d3946 LM |
53 | *mfr = readb(&gpmc_cfg->cs[0].nand_dat); |
54 | *id = readb(&gpmc_cfg->cs[0].nand_dat); | |
b1509e3a LM |
55 | |
56 | return 0; | |
4e647e12 | 57 | } |