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1 | /* |
2 | * (C) Copyright 2006 DENX Software Engineering | |
3 | * | |
4 | * See file CREDITS for list of people who contributed to this | |
5 | * project. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License as | |
9 | * published by the Free Software Foundation; either version 2 of | |
10 | * the License, or (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
20 | * MA 02111-1307 USA | |
21 | */ | |
22 | ||
23 | #include <common.h> | |
cfa460ad | 24 | #include <asm/io.h> |
addb2e16 | 25 | |
b9307262 | 26 | #if defined(CONFIG_CMD_NAND) |
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27 | |
28 | #include <nand.h> | |
29 | ||
30 | /* | |
31 | * hardware specific access to control-lines | |
32 | * function borrowed from Linux 2.6 (drivers/mtd/nand/ppchameleonevb.c) | |
33 | */ | |
cfa460ad | 34 | static void ppchameleonevb_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl) |
038ccac5 | 35 | { |
cfa460ad | 36 | struct nand_chip *this = mtd->priv; |
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37 | ulong base = (ulong) this->IO_ADDR_W; |
38 | ||
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39 | if (ctrl & NAND_CTRL_CHANGE) { |
40 | if ( ctrl & NAND_CLE ) | |
41 | MACRO_NAND_CTL_SETCLE((unsigned long)base); | |
42 | else | |
43 | MACRO_NAND_CTL_CLRCLE((unsigned long)base); | |
44 | if ( ctrl & NAND_ALE ) | |
45 | MACRO_NAND_CTL_CLRCLE((unsigned long)base); | |
46 | else | |
47 | MACRO_NAND_CTL_CLRALE((unsigned long)base); | |
48 | if ( ctrl & NAND_NCE ) | |
49 | MACRO_NAND_ENABLE_CE((unsigned long)base); | |
50 | else | |
51 | MACRO_NAND_DISABLE_CE((unsigned long)base); | |
038ccac5 | 52 | } |
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53 | |
54 | if (cmd != NAND_CMD_NONE) | |
55 | writeb(cmd, this->IO_ADDR_W); | |
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56 | } |
57 | ||
58 | ||
59 | /* | |
60 | * read device ready pin | |
61 | * function +/- borrowed from Linux 2.6 (drivers/mtd/nand/ppchameleonevb.c) | |
62 | */ | |
63 | static int ppchameleonevb_device_ready(struct mtd_info *mtdinfo) | |
64 | { | |
65 | struct nand_chip *this = mtdinfo->priv; | |
66 | ulong rb_gpio_pin; | |
67 | ||
68 | /* use the base addr to find out which chip are we dealing with */ | |
69 | switch((ulong) this->IO_ADDR_W) { | |
70 | case CFG_NAND0_BASE: | |
71 | rb_gpio_pin = CFG_NAND0_RDY; | |
72 | break; | |
73 | case CFG_NAND1_BASE: | |
74 | rb_gpio_pin = CFG_NAND1_RDY; | |
75 | break; | |
76 | default: /* this should never happen */ | |
77 | return 0; | |
78 | break; | |
79 | } | |
80 | ||
bfc81252 | 81 | if (in32(GPIO0_IR) & rb_gpio_pin) |
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82 | return 1; |
83 | return 0; | |
84 | } | |
85 | ||
86 | ||
87 | /* | |
88 | * Board-specific NAND initialization. The following members of the | |
addb2e16 | 89 | * argument are board-specific (per include/linux/mtd/nand.h): |
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90 | * - IO_ADDR_R?: address to read the 8 I/O lines of the flash device |
91 | * - IO_ADDR_W?: address to write the 8 I/O lines of the flash device | |
cfa460ad | 92 | * - cmd_ctrl: hardwarespecific function for accesing control-lines |
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93 | * - dev_ready: hardwarespecific function for accesing device ready/busy line |
94 | * - enable_hwecc?: function to enable (reset) hardware ecc generator. Must | |
95 | * only be provided if a hardware ECC is available | |
cfa460ad | 96 | * - ecc.mode: mode of ecc, see defines |
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97 | * - chip_delay: chip dependent delay for transfering data from array to |
98 | * read regs (tR) | |
99 | * - options: various chip options. They can partly be set to inform | |
100 | * nand_scan about special functionality. See the defines for further | |
101 | * explanation | |
102 | * Members with a "?" were not set in the merged testing-NAND branch, | |
103 | * so they are not set here either. | |
104 | */ | |
fa230445 | 105 | int board_nand_init(struct nand_chip *nand) |
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106 | { |
107 | ||
cfa460ad | 108 | nand->cmd_ctrl = ppchameleonevb_hwcontrol; |
038ccac5 | 109 | nand->dev_ready = ppchameleonevb_device_ready; |
cfa460ad | 110 | nand->ecc.mode = NAND_ECC_SOFT; |
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111 | nand->chip_delay = NAND_BIG_DELAY_US; |
112 | nand->options = NAND_SAMSUNG_LP_OPTIONS; | |
fa230445 | 113 | return 0; |
038ccac5 | 114 | } |
b9307262 | 115 | #endif |