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 #if !defined(CFG_NAND_LEGACY)
50 #include <asm/arch/nand_defs.h>
51 #include <asm/arch/emif_defs.h>
53 extern struct nand_chip nand_dev_desc[CFG_MAX_NAND_DEVICE];
55 static void nand_davinci_hwcontrol(struct mtd_info *mtd, int cmd)
57 struct nand_chip *this = mtd->priv;
58 u_int32_t IO_ADDR_W = (u_int32_t)this->IO_ADDR_W;
60 IO_ADDR_W &= ~(MASK_ALE|MASK_CLE);
64 IO_ADDR_W |= MASK_CLE;
67 IO_ADDR_W |= MASK_ALE;
71 this->IO_ADDR_W = (void *)IO_ADDR_W;
74 /* Set WP on deselect, write enable on select */
75 static void nand_davinci_select_chip(struct mtd_info *mtd, int chip)
77 #define GPIO_SET_DATA01 0x01c67018
78 #define GPIO_CLR_DATA01 0x01c6701c
79 #define GPIO_NAND_WP (1 << 4)
80 #ifdef SONATA_BOARD_GPIOWP
82 REG(GPIO_CLR_DATA01) |= GPIO_NAND_WP;
84 REG(GPIO_SET_DATA01) |= GPIO_NAND_WP;
89 #ifdef CFG_NAND_HW_ECC
90 #ifdef CFG_NAND_LARGEPAGE
91 static struct nand_oobinfo davinci_nand_oobinfo = {
92 .useecc = MTD_NANDECC_AUTOPLACE,
94 .eccpos = {8, 9, 10, 24, 25, 26, 40, 41, 42, 56, 57, 58},
95 .oobfree = { {2, 6}, {12, 12}, {28, 12}, {44, 12}, {60, 4} }
97 #elif defined(CFG_NAND_SMALLPAGE)
98 static struct nand_oobinfo davinci_nand_oobinfo = {
99 .useecc = MTD_NANDECC_AUTOPLACE,
102 .oobfree = { {6, 2}, {8, 8} }
105 #error "Either CFG_NAND_LARGEPAGE or CFG_NAND_SMALLPAGE must be defined!"
108 static void nand_davinci_enable_hwecc(struct mtd_info *mtd, int mode)
113 emif_addr = (emifregs)DAVINCI_ASYNC_EMIF_CNTRL_BASE;
115 dummy = emif_addr->NANDF1ECC;
116 dummy = emif_addr->NANDF2ECC;
117 dummy = emif_addr->NANDF3ECC;
118 dummy = emif_addr->NANDF4ECC;
120 emif_addr->NANDFCR |= (1 << (CFG_DAVINCI_NANDCE + 6));
123 static u_int32_t nand_davinci_readecc(struct mtd_info *mtd, u_int32_t region)
126 emifregs emif_base_addr;
128 emif_base_addr = (emifregs)DAVINCI_ASYNC_EMIF_CNTRL_BASE;
131 ecc = emif_base_addr->NANDF1ECC;
132 else if (region == 2)
133 ecc = emif_base_addr->NANDF2ECC;
134 else if (region == 3)
135 ecc = emif_base_addr->NANDF3ECC;
136 else if (region == 4)
137 ecc = emif_base_addr->NANDF4ECC;
142 static int nand_davinci_calculate_ecc(struct mtd_info *mtd, const u_char *dat, u_char *ecc_code)
146 struct nand_chip *this = mtd->priv;
148 n = (this->eccmode == NAND_ECC_HW12_2048) ? 4 : 1;
150 region = (CFG_DAVINCI_NANDCE - 1);
152 tmp = nand_davinci_readecc(mtd, region);
154 *ecc_code++ = tmp >> 16;
155 *ecc_code++ = ((tmp >> 8) & 0x0f) | ((tmp >> 20) & 0xf0);
161 static void nand_davinci_gen_true_ecc(u_int8_t *ecc_buf)
163 u_int32_t tmp = ecc_buf[0] | (ecc_buf[1] << 16) | ((ecc_buf[2] & 0xf0) << 20) | ((ecc_buf[2] & 0x0f) << 8);
165 ecc_buf[0] = ~(P64o(tmp) | P64e(tmp) | P32o(tmp) | P32e(tmp) | P16o(tmp) | P16e(tmp) | P8o(tmp) | P8e(tmp));
166 ecc_buf[1] = ~(P1024o(tmp) | P1024e(tmp) | P512o(tmp) | P512e(tmp) | P256o(tmp) | P256e(tmp) | P128o(tmp) | P128e(tmp));
167 ecc_buf[2] = ~( P4o(tmp) | P4e(tmp) | P2o(tmp) | P2e(tmp) | P1o(tmp) | P1e(tmp) | P2048o(tmp) | P2048e(tmp));
170 static int nand_davinci_compare_ecc(u_int8_t *ecc_nand, u_int8_t *ecc_calc, u_int8_t *page_data)
173 u_int8_t tmp0_bit[8], tmp1_bit[8], tmp2_bit[8];
174 u_int8_t comp0_bit[8], comp1_bit[8], comp2_bit[8];
175 u_int8_t ecc_bit[24];
176 u_int8_t ecc_sum = 0;
177 u_int8_t find_bit = 0;
178 u_int32_t find_byte = 0;
181 is_ecc_ff = ((*ecc_nand == 0xff) && (*(ecc_nand + 1) == 0xff) && (*(ecc_nand + 2) == 0xff));
183 nand_davinci_gen_true_ecc(ecc_nand);
184 nand_davinci_gen_true_ecc(ecc_calc);
186 for (i = 0; i <= 2; i++) {
187 *(ecc_nand + i) = ~(*(ecc_nand + i));
188 *(ecc_calc + i) = ~(*(ecc_calc + i));
191 for (i = 0; i < 8; i++) {
192 tmp0_bit[i] = *ecc_nand % 2;
193 *ecc_nand = *ecc_nand / 2;
196 for (i = 0; i < 8; i++) {
197 tmp1_bit[i] = *(ecc_nand + 1) % 2;
198 *(ecc_nand + 1) = *(ecc_nand + 1) / 2;
201 for (i = 0; i < 8; i++) {
202 tmp2_bit[i] = *(ecc_nand + 2) % 2;
203 *(ecc_nand + 2) = *(ecc_nand + 2) / 2;
206 for (i = 0; i < 8; i++) {
207 comp0_bit[i] = *ecc_calc % 2;
208 *ecc_calc = *ecc_calc / 2;
211 for (i = 0; i < 8; i++) {
212 comp1_bit[i] = *(ecc_calc + 1) % 2;
213 *(ecc_calc + 1) = *(ecc_calc + 1) / 2;
216 for (i = 0; i < 8; i++) {
217 comp2_bit[i] = *(ecc_calc + 2) % 2;
218 *(ecc_calc + 2) = *(ecc_calc + 2) / 2;
221 for (i = 0; i< 6; i++)
222 ecc_bit[i] = tmp2_bit[i + 2] ^ comp2_bit[i + 2];
224 for (i = 0; i < 8; i++)
225 ecc_bit[i + 6] = tmp0_bit[i] ^ comp0_bit[i];
227 for (i = 0; i < 8; i++)
228 ecc_bit[i + 14] = tmp1_bit[i] ^ comp1_bit[i];
230 ecc_bit[22] = tmp2_bit[0] ^ comp2_bit[0];
231 ecc_bit[23] = tmp2_bit[1] ^ comp2_bit[1];
233 for (i = 0; i < 24; i++)
234 ecc_sum += ecc_bit[i];
238 /* Not reached because this function is not called if
239 ECC values are equal */
242 /* Uncorrectable error */
243 DEBUG (MTD_DEBUG_LEVEL0, "ECC UNCORRECTED_ERROR 1\n");
246 /* Correctable error */
247 find_byte = (ecc_bit[23] << 8) +
257 find_bit = (ecc_bit[5] << 2) + (ecc_bit[3] << 1) + ecc_bit[1];
259 DEBUG (MTD_DEBUG_LEVEL0, "Correcting single bit ECC error at offset: %d, bit: %d\n", find_byte, find_bit);
261 page_data[find_byte] ^= (1 << find_bit);
266 if (ecc_calc[0] == 0 && ecc_calc[1] == 0 && ecc_calc[2] == 0)
269 DEBUG (MTD_DEBUG_LEVEL0, "UNCORRECTED_ERROR default\n");
274 static int nand_davinci_correct_data(struct mtd_info *mtd, u_char *dat, u_char *read_ecc, u_char *calc_ecc)
276 struct nand_chip *this;
277 int block_count = 0, i, rc;
280 block_count = (this->eccmode == NAND_ECC_HW12_2048) ? 4 : 1;
281 for (i = 0; i < block_count; i++) {
282 if (memcmp(read_ecc, calc_ecc, 3) != 0) {
283 rc = nand_davinci_compare_ecc(read_ecc, calc_ecc, dat);
296 static int nand_davinci_dev_ready(struct mtd_info *mtd)
300 emif_addr = (emifregs)DAVINCI_ASYNC_EMIF_CNTRL_BASE;
302 return(emif_addr->NANDFSR & 0x1);
305 static int nand_davinci_waitfunc(struct mtd_info *mtd, struct nand_chip *this, int state)
307 while(!nand_davinci_dev_ready(mtd)) {;}
308 *NAND_CE0CLE = NAND_STATUS;
309 return(*NAND_CE0DATA);
312 static void nand_flash_init(void)
314 /* All EMIF initialization is done in lowlevel_init.S
315 * and config values are in the board config files
319 int board_nand_init(struct nand_chip *nand)
321 nand->IO_ADDR_R = (void __iomem *)NAND_CE0DATA;
322 nand->IO_ADDR_W = (void __iomem *)NAND_CE0DATA;
323 nand->chip_delay = 0;
324 nand->select_chip = nand_davinci_select_chip;
325 #ifdef CFG_NAND_USE_FLASH_BBT
326 nand->options = NAND_USE_FLASH_BBT;
328 #ifdef CFG_NAND_HW_ECC
329 #ifdef CFG_NAND_LARGEPAGE
330 nand->eccmode = NAND_ECC_HW12_2048;
331 #elif defined(CFG_NAND_SMALLPAGE)
332 nand->eccmode = NAND_ECC_HW3_512;
334 #error "Either CFG_NAND_LARGEPAGE or CFG_NAND_SMALLPAGE must be defined!"
336 nand->autooob = &davinci_nand_oobinfo;
337 nand->calculate_ecc = nand_davinci_calculate_ecc;
338 nand->correct_data = nand_davinci_correct_data;
339 nand->enable_hwecc = nand_davinci_enable_hwecc;
341 nand->eccmode = NAND_ECC_SOFT;
344 /* Set address of hardware control function */
345 nand->hwcontrol = nand_davinci_hwcontrol;
347 nand->dev_ready = nand_davinci_dev_ready;
348 nand->waitfunc = nand_davinci_waitfunc;
356 #error "U-Boot legacy NAND support not available for DaVinci chips"
358 #endif /* CFG_USE_NAND */