2 * NAND driver for TI DaVinci based boards.
4 * Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net>
6 * Based on Linux DaVinci NAND driver by TI. Original copyright follows:
11 * linux/drivers/mtd/nand/nand_davinci.c
15 * Copyright (C) 2006 Texas Instruments.
17 * ----------------------------------------------------------------------------
19 * This program is free software; you can redistribute it and/or modify
20 * it under the terms of the GNU General Public License as published by
21 * the Free Software Foundation; either version 2 of the License, or
22 * (at your option) any later version.
24 * This program is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
29 * You should have received a copy of the GNU General Public License
30 * along with this program; if not, write to the Free Software
31 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
32 * ----------------------------------------------------------------------------
35 * This is a device driver for the NAND flash device found on the
36 * DaVinci board which utilizes the Samsung k9k2g08 part.
39 ver. 1.0: Feb 2005, Vinod/Sudhakar
47 #include <asm/arch/nand_defs.h>
48 #include <asm/arch/emif_defs.h>
50 static emif_registers *const emif_regs = (void *) DAVINCI_ASYNC_EMIF_CNTRL_BASE;
52 static void nand_davinci_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
54 struct nand_chip *this = mtd->priv;
55 u_int32_t IO_ADDR_W = (u_int32_t)this->IO_ADDR_W;
57 IO_ADDR_W &= ~(MASK_ALE|MASK_CLE);
59 if (ctrl & NAND_CTRL_CHANGE) {
60 if ( ctrl & NAND_CLE )
61 IO_ADDR_W |= MASK_CLE;
62 if ( ctrl & NAND_ALE )
63 IO_ADDR_W |= MASK_ALE;
64 this->IO_ADDR_W = (void __iomem *) IO_ADDR_W;
67 if (cmd != NAND_CMD_NONE)
68 writeb(cmd, this->IO_ADDR_W);
71 #ifdef CONFIG_SYS_NAND_HW_ECC
73 static void nand_davinci_enable_hwecc(struct mtd_info *mtd, int mode)
77 dummy = emif_regs->NANDF1ECC;
79 /* FIXME: only chipselect 0 is supported for now */
80 emif_regs->NANDFCR |= 1 << 8;
83 static u_int32_t nand_davinci_readecc(struct mtd_info *mtd, u_int32_t region)
88 ecc = emif_regs->NANDF1ECC;
90 ecc = emif_regs->NANDF2ECC;
92 ecc = emif_regs->NANDF3ECC;
94 ecc = emif_regs->NANDF4ECC;
99 static int nand_davinci_calculate_ecc(struct mtd_info *mtd, const u_char *dat, u_char *ecc_code)
102 const int region = 1;
104 tmp = nand_davinci_readecc(mtd, region);
106 /* Squeeze 4 bytes ECC into 3 bytes by removing RESERVED bits
107 * and shifting. RESERVED bits are 31 to 28 and 15 to 12. */
108 tmp = (tmp & 0x00000fff) | ((tmp & 0x0fff0000) >> 4);
110 /* Invert so that erased block ECC is correct */
114 *ecc_code++ = tmp >> 8;
115 *ecc_code++ = tmp >> 16;
117 /* NOTE: the above code matches mainline Linux:
118 * .PQR.stu ==> ~PQRstu
120 * MontaVista/TI kernels encode those bytes differently, use
121 * complicated (and allegedly sometimes-wrong) correction code,
122 * and usually shipped with U-Boot that uses software ECC:
123 * .PQR.stu ==> PsQRtu
125 * If you need MV/TI compatible NAND I/O in U-Boot, it should
126 * be possible to (a) change the mangling above, (b) reverse
127 * that mangling in nand_davinci_correct_data() below.
133 static int nand_davinci_correct_data(struct mtd_info *mtd, u_char *dat, u_char *read_ecc, u_char *calc_ecc)
135 struct nand_chip *this = mtd->priv;
136 u_int32_t ecc_nand = read_ecc[0] | (read_ecc[1] << 8) |
138 u_int32_t ecc_calc = calc_ecc[0] | (calc_ecc[1] << 8) |
140 u_int32_t diff = ecc_calc ^ ecc_nand;
143 if ((((diff >> 12) ^ diff) & 0xfff) == 0xfff) {
144 /* Correctable error */
145 if ((diff >> (12 + 3)) < this->ecc.size) {
146 uint8_t find_bit = 1 << ((diff >> 12) & 7);
147 uint32_t find_byte = diff >> (12 + 3);
149 dat[find_byte] ^= find_bit;
150 MTDDEBUG(MTD_DEBUG_LEVEL0, "Correcting single "
151 "bit ECC error at offset: %d, bit: "
152 "%d\n", find_byte, find_bit);
157 } else if (!(diff & (diff - 1))) {
158 /* Single bit ECC error in the ECC itself,
160 MTDDEBUG(MTD_DEBUG_LEVEL0, "Single bit ECC error in "
164 /* Uncorrectable error */
165 MTDDEBUG(MTD_DEBUG_LEVEL0, "ECC UNCORRECTED_ERROR 1\n");
171 #endif /* CONFIG_SYS_NAND_HW_ECC */
173 static int nand_davinci_dev_ready(struct mtd_info *mtd)
175 return emif_regs->NANDFSR & 0x1;
178 static void nand_flash_init(void)
180 /* This is for DM6446 EVM and *very* similar. DO NOT GROW THIS!
181 * Instead, have your board_init() set EMIF timings, based on its
182 * knowledge of the clocks and what devices are hooked up ... and
183 * don't even do that unless no UBL handled it.
185 #ifdef CONFIG_SOC_DM644X
186 u_int32_t acfg1 = 0x3ffffffc;
188 /*------------------------------------------------------------------*
189 * NAND FLASH CHIP TIMEOUT @ 459 MHz *
191 * AEMIF.CLK freq = PLL1/6 = 459/6 = 76.5 MHz *
192 * AEMIF.CLK period = 1/76.5 MHz = 13.1 ns *
194 *------------------------------------------------------------------*/
196 | (0 << 31 ) /* selectStrobe */
197 | (0 << 30 ) /* extWait */
198 | (1 << 26 ) /* writeSetup 10 ns */
199 | (3 << 20 ) /* writeStrobe 40 ns */
200 | (1 << 17 ) /* writeHold 10 ns */
201 | (1 << 13 ) /* readSetup 10 ns */
202 | (5 << 7 ) /* readStrobe 60 ns */
203 | (1 << 4 ) /* readHold 10 ns */
204 | (3 << 2 ) /* turnAround ?? ns */
205 | (0 << 0 ) /* asyncSize 8-bit bus */
208 emif_regs->AB1CR = acfg1; /* CS2 */
210 emif_regs->NANDFCR = 0x00000101; /* NAND flash on CS2 */
214 void davinci_nand_init(struct nand_chip *nand)
216 nand->chip_delay = 0;
217 #ifdef CONFIG_SYS_NAND_USE_FLASH_BBT
218 nand->options = NAND_USE_FLASH_BBT;
220 #ifdef CONFIG_SYS_NAND_HW_ECC
221 nand->ecc.mode = NAND_ECC_HW;
222 nand->ecc.size = 512;
224 nand->ecc.calculate = nand_davinci_calculate_ecc;
225 nand->ecc.correct = nand_davinci_correct_data;
226 nand->ecc.hwctl = nand_davinci_enable_hwecc;
228 nand->ecc.mode = NAND_ECC_SOFT;
229 #endif /* CONFIG_SYS_NAND_HW_ECC */
231 /* Set address of hardware control function */
232 nand->cmd_ctrl = nand_davinci_hwcontrol;
234 nand->dev_ready = nand_davinci_dev_ready;
239 int board_nand_init(struct nand_chip *chip) __attribute__((weak));
241 int board_nand_init(struct nand_chip *chip)
243 davinci_nand_init(chip);