Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright © 2004 Texas Instruments, Jian Zhang <jzhang@ti.com> |
| 3 | * Copyright © 2004 Micron Technology Inc. |
| 4 | * Copyright © 2004 David Brownell |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | */ |
| 10 | |
| 11 | #include <linux/platform_device.h> |
Russell King | 763e735 | 2012-04-25 00:16:00 +0100 | [diff] [blame] | 12 | #include <linux/dmaengine.h> |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 13 | #include <linux/dma-mapping.h> |
| 14 | #include <linux/delay.h> |
Paul Gortmaker | a0e5cc5 | 2011-07-03 15:17:31 -0400 | [diff] [blame] | 15 | #include <linux/module.h> |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 16 | #include <linux/interrupt.h> |
vimal singh | c276aca | 2009-06-27 11:07:06 +0530 | [diff] [blame] | 17 | #include <linux/jiffies.h> |
| 18 | #include <linux/sched.h> |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 19 | #include <linux/mtd/mtd.h> |
| 20 | #include <linux/mtd/nand.h> |
| 21 | #include <linux/mtd/partitions.h> |
Russell King | 763e735 | 2012-04-25 00:16:00 +0100 | [diff] [blame] | 22 | #include <linux/omap-dma.h> |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 23 | #include <linux/io.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 24 | #include <linux/slab.h> |
Philip Avinash | 62116e5 | 2013-01-04 13:26:51 +0530 | [diff] [blame] | 25 | #include <linux/of.h> |
| 26 | #include <linux/of_device.h> |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 27 | |
Pekon Gupta | 32d42a8 | 2013-10-24 18:20:23 +0530 | [diff] [blame] | 28 | #include <linux/mtd/nand_bch.h> |
Philip Avinash | 62116e5 | 2013-01-04 13:26:51 +0530 | [diff] [blame] | 29 | #include <linux/platform_data/elm.h> |
Ivan Djelic | 0e618ef | 2012-04-30 12:17:18 +0200 | [diff] [blame] | 30 | |
Arnd Bergmann | 2203747 | 2012-08-24 15:21:06 +0200 | [diff] [blame] | 31 | #include <linux/platform_data/mtd-nand-omap2.h> |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 32 | |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 33 | #define DRIVER_NAME "omap2-nand" |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 34 | #define OMAP_NAND_TIMEOUT_MS 5000 |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 35 | |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 36 | #define NAND_Ecc_P1e (1 << 0) |
| 37 | #define NAND_Ecc_P2e (1 << 1) |
| 38 | #define NAND_Ecc_P4e (1 << 2) |
| 39 | #define NAND_Ecc_P8e (1 << 3) |
| 40 | #define NAND_Ecc_P16e (1 << 4) |
| 41 | #define NAND_Ecc_P32e (1 << 5) |
| 42 | #define NAND_Ecc_P64e (1 << 6) |
| 43 | #define NAND_Ecc_P128e (1 << 7) |
| 44 | #define NAND_Ecc_P256e (1 << 8) |
| 45 | #define NAND_Ecc_P512e (1 << 9) |
| 46 | #define NAND_Ecc_P1024e (1 << 10) |
| 47 | #define NAND_Ecc_P2048e (1 << 11) |
| 48 | |
| 49 | #define NAND_Ecc_P1o (1 << 16) |
| 50 | #define NAND_Ecc_P2o (1 << 17) |
| 51 | #define NAND_Ecc_P4o (1 << 18) |
| 52 | #define NAND_Ecc_P8o (1 << 19) |
| 53 | #define NAND_Ecc_P16o (1 << 20) |
| 54 | #define NAND_Ecc_P32o (1 << 21) |
| 55 | #define NAND_Ecc_P64o (1 << 22) |
| 56 | #define NAND_Ecc_P128o (1 << 23) |
| 57 | #define NAND_Ecc_P256o (1 << 24) |
| 58 | #define NAND_Ecc_P512o (1 << 25) |
| 59 | #define NAND_Ecc_P1024o (1 << 26) |
| 60 | #define NAND_Ecc_P2048o (1 << 27) |
| 61 | |
| 62 | #define TF(value) (value ? 1 : 0) |
| 63 | |
| 64 | #define P2048e(a) (TF(a & NAND_Ecc_P2048e) << 0) |
| 65 | #define P2048o(a) (TF(a & NAND_Ecc_P2048o) << 1) |
| 66 | #define P1e(a) (TF(a & NAND_Ecc_P1e) << 2) |
| 67 | #define P1o(a) (TF(a & NAND_Ecc_P1o) << 3) |
| 68 | #define P2e(a) (TF(a & NAND_Ecc_P2e) << 4) |
| 69 | #define P2o(a) (TF(a & NAND_Ecc_P2o) << 5) |
| 70 | #define P4e(a) (TF(a & NAND_Ecc_P4e) << 6) |
| 71 | #define P4o(a) (TF(a & NAND_Ecc_P4o) << 7) |
| 72 | |
| 73 | #define P8e(a) (TF(a & NAND_Ecc_P8e) << 0) |
| 74 | #define P8o(a) (TF(a & NAND_Ecc_P8o) << 1) |
| 75 | #define P16e(a) (TF(a & NAND_Ecc_P16e) << 2) |
| 76 | #define P16o(a) (TF(a & NAND_Ecc_P16o) << 3) |
| 77 | #define P32e(a) (TF(a & NAND_Ecc_P32e) << 4) |
| 78 | #define P32o(a) (TF(a & NAND_Ecc_P32o) << 5) |
| 79 | #define P64e(a) (TF(a & NAND_Ecc_P64e) << 6) |
| 80 | #define P64o(a) (TF(a & NAND_Ecc_P64o) << 7) |
| 81 | |
| 82 | #define P128e(a) (TF(a & NAND_Ecc_P128e) << 0) |
| 83 | #define P128o(a) (TF(a & NAND_Ecc_P128o) << 1) |
| 84 | #define P256e(a) (TF(a & NAND_Ecc_P256e) << 2) |
| 85 | #define P256o(a) (TF(a & NAND_Ecc_P256o) << 3) |
| 86 | #define P512e(a) (TF(a & NAND_Ecc_P512e) << 4) |
| 87 | #define P512o(a) (TF(a & NAND_Ecc_P512o) << 5) |
| 88 | #define P1024e(a) (TF(a & NAND_Ecc_P1024e) << 6) |
| 89 | #define P1024o(a) (TF(a & NAND_Ecc_P1024o) << 7) |
| 90 | |
| 91 | #define P8e_s(a) (TF(a & NAND_Ecc_P8e) << 0) |
| 92 | #define P8o_s(a) (TF(a & NAND_Ecc_P8o) << 1) |
| 93 | #define P16e_s(a) (TF(a & NAND_Ecc_P16e) << 2) |
| 94 | #define P16o_s(a) (TF(a & NAND_Ecc_P16o) << 3) |
| 95 | #define P1e_s(a) (TF(a & NAND_Ecc_P1e) << 4) |
| 96 | #define P1o_s(a) (TF(a & NAND_Ecc_P1o) << 5) |
| 97 | #define P2e_s(a) (TF(a & NAND_Ecc_P2e) << 6) |
| 98 | #define P2o_s(a) (TF(a & NAND_Ecc_P2o) << 7) |
| 99 | |
| 100 | #define P4e_s(a) (TF(a & NAND_Ecc_P4e) << 0) |
| 101 | #define P4o_s(a) (TF(a & NAND_Ecc_P4o) << 1) |
| 102 | |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 103 | #define PREFETCH_CONFIG1_CS_SHIFT 24 |
| 104 | #define ECC_CONFIG_CS_SHIFT 1 |
| 105 | #define CS_MASK 0x7 |
| 106 | #define ENABLE_PREFETCH (0x1 << 7) |
| 107 | #define DMA_MPU_MODE_SHIFT 2 |
Afzal Mohammed | 2ef9f3d | 2012-10-04 19:03:06 +0530 | [diff] [blame] | 108 | #define ECCSIZE0_SHIFT 12 |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 109 | #define ECCSIZE1_SHIFT 22 |
| 110 | #define ECC1RESULTSIZE 0x1 |
| 111 | #define ECCCLEAR 0x100 |
| 112 | #define ECC1 0x1 |
Afzal Mohammed | 47f88af4 | 2012-09-29 18:20:11 +0530 | [diff] [blame] | 113 | #define PREFETCH_FIFOTHRESHOLD_MAX 0x40 |
| 114 | #define PREFETCH_FIFOTHRESHOLD(val) ((val) << 8) |
| 115 | #define PREFETCH_STATUS_COUNT(val) (val & 0x00003fff) |
| 116 | #define PREFETCH_STATUS_FIFO_CNT(val) ((val >> 24) & 0x7F) |
| 117 | #define STATUS_BUFF_EMPTY 0x00000001 |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 118 | |
Lokesh Vutla | d5e7c86 | 2012-10-15 14:03:51 -0700 | [diff] [blame] | 119 | #define OMAP24XX_DMA_GPMC 4 |
| 120 | |
Philip Avinash | c3e4b99 | 2013-01-04 13:26:49 +0530 | [diff] [blame] | 121 | #define BCH8_MAX_ERROR 8 /* upto 8 bit correctable */ |
| 122 | #define BCH4_MAX_ERROR 4 /* upto 4 bit correctable */ |
| 123 | |
Philip Avinash | 62116e5 | 2013-01-04 13:26:51 +0530 | [diff] [blame] | 124 | #define SECTOR_BYTES 512 |
| 125 | /* 4 bit padding to make byte aligned, 56 = 52 + 4 */ |
| 126 | #define BCH4_BIT_PAD 4 |
| 127 | #define BCH8_ECC_MAX ((SECTOR_BYTES + BCH8_ECC_OOB_BYTES) * 8) |
| 128 | #define BCH4_ECC_MAX ((SECTOR_BYTES + BCH4_ECC_OOB_BYTES) * 8) |
| 129 | |
| 130 | /* GPMC ecc engine settings for read */ |
| 131 | #define BCH_WRAPMODE_1 1 /* BCH wrap mode 1 */ |
| 132 | #define BCH8R_ECC_SIZE0 0x1a /* ecc_size0 = 26 */ |
| 133 | #define BCH8R_ECC_SIZE1 0x2 /* ecc_size1 = 2 */ |
| 134 | #define BCH4R_ECC_SIZE0 0xd /* ecc_size0 = 13 */ |
| 135 | #define BCH4R_ECC_SIZE1 0x3 /* ecc_size1 = 3 */ |
| 136 | |
| 137 | /* GPMC ecc engine settings for write */ |
| 138 | #define BCH_WRAPMODE_6 6 /* BCH wrap mode 6 */ |
| 139 | #define BCH_ECC_SIZE0 0x0 /* ecc_size0 = 0, no oob protection */ |
| 140 | #define BCH_ECC_SIZE1 0x20 /* ecc_size1 = 32 */ |
| 141 | |
Pekon Gupta | b491da7 | 2013-10-24 18:20:22 +0530 | [diff] [blame] | 142 | #define BADBLOCK_MARKER_LENGTH 2 |
Pekon Gupta | a919e51 | 2013-10-24 18:20:21 +0530 | [diff] [blame] | 143 | |
Philip Avinash | 62116e5 | 2013-01-04 13:26:51 +0530 | [diff] [blame] | 144 | #ifdef CONFIG_MTD_NAND_OMAP_BCH |
| 145 | static u_char bch8_vector[] = {0xf3, 0xdb, 0x14, 0x16, 0x8b, 0xd2, 0xbe, 0xcc, |
| 146 | 0xac, 0x6b, 0xff, 0x99, 0x7b}; |
| 147 | static u_char bch4_vector[] = {0x00, 0x6b, 0x31, 0xdd, 0x41, 0xbc, 0x10}; |
| 148 | #endif |
| 149 | |
Sukumar Ghorai | f040d33 | 2011-01-28 15:42:09 +0530 | [diff] [blame] | 150 | /* oob info generated runtime depending on ecc algorithm and layout selected */ |
| 151 | static struct nand_ecclayout omap_oobinfo; |
vimal singh | 59e9c5a | 2009-07-13 16:26:24 +0530 | [diff] [blame] | 152 | |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 153 | struct omap_nand_info { |
| 154 | struct nand_hw_control controller; |
| 155 | struct omap_nand_platform_data *pdata; |
| 156 | struct mtd_info mtd; |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 157 | struct nand_chip nand; |
| 158 | struct platform_device *pdev; |
| 159 | |
| 160 | int gpmc_cs; |
| 161 | unsigned long phys_base; |
Afzal Mohammed | 9c4c2f8 | 2012-08-30 12:53:23 -0700 | [diff] [blame] | 162 | unsigned long mem_size; |
Pekon Gupta | 4e55807 | 2014-03-18 18:56:42 +0530 | [diff] [blame] | 163 | enum omap_ecc ecc_opt; |
vimal singh | dfe3289 | 2009-07-13 16:29:16 +0530 | [diff] [blame] | 164 | struct completion comp; |
Russell King | 763e735 | 2012-04-25 00:16:00 +0100 | [diff] [blame] | 165 | struct dma_chan *dma; |
Afzal Mohammed | 5c46845 | 2012-08-30 12:53:24 -0700 | [diff] [blame] | 166 | int gpmc_irq_fifo; |
| 167 | int gpmc_irq_count; |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 168 | enum { |
| 169 | OMAP_NAND_IO_READ = 0, /* read */ |
| 170 | OMAP_NAND_IO_WRITE, /* write */ |
| 171 | } iomode; |
| 172 | u_char *buf; |
| 173 | int buf_len; |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 174 | struct gpmc_nand_regs reg; |
Pekon Gupta | a919e51 | 2013-10-24 18:20:21 +0530 | [diff] [blame] | 175 | /* fields specific for BCHx_HW ECC scheme */ |
Philip Avinash | 62116e5 | 2013-01-04 13:26:51 +0530 | [diff] [blame] | 176 | bool is_elm_used; |
| 177 | struct device *elm_dev; |
| 178 | struct device_node *of_node; |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 179 | }; |
| 180 | |
| 181 | /** |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 182 | * omap_prefetch_enable - configures and starts prefetch transfer |
| 183 | * @cs: cs (chip select) number |
| 184 | * @fifo_th: fifo threshold to be used for read/ write |
| 185 | * @dma_mode: dma mode enable (1) or disable (0) |
| 186 | * @u32_count: number of bytes to be transferred |
| 187 | * @is_write: prefetch read(0) or write post(1) mode |
| 188 | */ |
| 189 | static int omap_prefetch_enable(int cs, int fifo_th, int dma_mode, |
| 190 | unsigned int u32_count, int is_write, struct omap_nand_info *info) |
| 191 | { |
| 192 | u32 val; |
| 193 | |
| 194 | if (fifo_th > PREFETCH_FIFOTHRESHOLD_MAX) |
| 195 | return -1; |
| 196 | |
| 197 | if (readl(info->reg.gpmc_prefetch_control)) |
| 198 | return -EBUSY; |
| 199 | |
| 200 | /* Set the amount of bytes to be prefetched */ |
| 201 | writel(u32_count, info->reg.gpmc_prefetch_config2); |
| 202 | |
| 203 | /* Set dma/mpu mode, the prefetch read / post write and |
| 204 | * enable the engine. Set which cs is has requested for. |
| 205 | */ |
| 206 | val = ((cs << PREFETCH_CONFIG1_CS_SHIFT) | |
| 207 | PREFETCH_FIFOTHRESHOLD(fifo_th) | ENABLE_PREFETCH | |
| 208 | (dma_mode << DMA_MPU_MODE_SHIFT) | (0x1 & is_write)); |
| 209 | writel(val, info->reg.gpmc_prefetch_config1); |
| 210 | |
| 211 | /* Start the prefetch engine */ |
| 212 | writel(0x1, info->reg.gpmc_prefetch_control); |
| 213 | |
| 214 | return 0; |
| 215 | } |
| 216 | |
| 217 | /** |
| 218 | * omap_prefetch_reset - disables and stops the prefetch engine |
| 219 | */ |
| 220 | static int omap_prefetch_reset(int cs, struct omap_nand_info *info) |
| 221 | { |
| 222 | u32 config1; |
| 223 | |
| 224 | /* check if the same module/cs is trying to reset */ |
| 225 | config1 = readl(info->reg.gpmc_prefetch_config1); |
| 226 | if (((config1 >> PREFETCH_CONFIG1_CS_SHIFT) & CS_MASK) != cs) |
| 227 | return -EINVAL; |
| 228 | |
| 229 | /* Stop the PFPW engine */ |
| 230 | writel(0x0, info->reg.gpmc_prefetch_control); |
| 231 | |
| 232 | /* Reset/disable the PFPW engine */ |
| 233 | writel(0x0, info->reg.gpmc_prefetch_config1); |
| 234 | |
| 235 | return 0; |
| 236 | } |
| 237 | |
| 238 | /** |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 239 | * omap_hwcontrol - hardware specific access to control-lines |
| 240 | * @mtd: MTD device structure |
| 241 | * @cmd: command to device |
| 242 | * @ctrl: |
| 243 | * NAND_NCE: bit 0 -> don't care |
| 244 | * NAND_CLE: bit 1 -> Command Latch |
| 245 | * NAND_ALE: bit 2 -> Address Latch |
| 246 | * |
| 247 | * NOTE: boards may use different bits for these!! |
| 248 | */ |
| 249 | static void omap_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl) |
| 250 | { |
| 251 | struct omap_nand_info *info = container_of(mtd, |
| 252 | struct omap_nand_info, mtd); |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 253 | |
Sukumar Ghorai | 2c01946c | 2010-07-09 09:14:45 +0000 | [diff] [blame] | 254 | if (cmd != NAND_CMD_NONE) { |
| 255 | if (ctrl & NAND_CLE) |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 256 | writeb(cmd, info->reg.gpmc_nand_command); |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 257 | |
Sukumar Ghorai | 2c01946c | 2010-07-09 09:14:45 +0000 | [diff] [blame] | 258 | else if (ctrl & NAND_ALE) |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 259 | writeb(cmd, info->reg.gpmc_nand_address); |
Sukumar Ghorai | 2c01946c | 2010-07-09 09:14:45 +0000 | [diff] [blame] | 260 | |
| 261 | else /* NAND_NCE */ |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 262 | writeb(cmd, info->reg.gpmc_nand_data); |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 263 | } |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 264 | } |
| 265 | |
| 266 | /** |
vimal singh | 59e9c5a | 2009-07-13 16:26:24 +0530 | [diff] [blame] | 267 | * omap_read_buf8 - read data from NAND controller into buffer |
| 268 | * @mtd: MTD device structure |
| 269 | * @buf: buffer to store date |
| 270 | * @len: number of bytes to read |
| 271 | */ |
| 272 | static void omap_read_buf8(struct mtd_info *mtd, u_char *buf, int len) |
| 273 | { |
| 274 | struct nand_chip *nand = mtd->priv; |
| 275 | |
| 276 | ioread8_rep(nand->IO_ADDR_R, buf, len); |
| 277 | } |
| 278 | |
| 279 | /** |
| 280 | * omap_write_buf8 - write buffer to NAND controller |
| 281 | * @mtd: MTD device structure |
| 282 | * @buf: data buffer |
| 283 | * @len: number of bytes to write |
| 284 | */ |
| 285 | static void omap_write_buf8(struct mtd_info *mtd, const u_char *buf, int len) |
| 286 | { |
| 287 | struct omap_nand_info *info = container_of(mtd, |
| 288 | struct omap_nand_info, mtd); |
| 289 | u_char *p = (u_char *)buf; |
Sukumar Ghorai | 2c01946c | 2010-07-09 09:14:45 +0000 | [diff] [blame] | 290 | u32 status = 0; |
vimal singh | 59e9c5a | 2009-07-13 16:26:24 +0530 | [diff] [blame] | 291 | |
| 292 | while (len--) { |
| 293 | iowrite8(*p++, info->nand.IO_ADDR_W); |
Sukumar Ghorai | 2c01946c | 2010-07-09 09:14:45 +0000 | [diff] [blame] | 294 | /* wait until buffer is available for write */ |
| 295 | do { |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 296 | status = readl(info->reg.gpmc_status) & |
Afzal Mohammed | 47f88af4 | 2012-09-29 18:20:11 +0530 | [diff] [blame] | 297 | STATUS_BUFF_EMPTY; |
Sukumar Ghorai | 2c01946c | 2010-07-09 09:14:45 +0000 | [diff] [blame] | 298 | } while (!status); |
vimal singh | 59e9c5a | 2009-07-13 16:26:24 +0530 | [diff] [blame] | 299 | } |
| 300 | } |
| 301 | |
| 302 | /** |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 303 | * omap_read_buf16 - read data from NAND controller into buffer |
| 304 | * @mtd: MTD device structure |
| 305 | * @buf: buffer to store date |
| 306 | * @len: number of bytes to read |
| 307 | */ |
| 308 | static void omap_read_buf16(struct mtd_info *mtd, u_char *buf, int len) |
| 309 | { |
| 310 | struct nand_chip *nand = mtd->priv; |
| 311 | |
vimal singh | 59e9c5a | 2009-07-13 16:26:24 +0530 | [diff] [blame] | 312 | ioread16_rep(nand->IO_ADDR_R, buf, len / 2); |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 313 | } |
| 314 | |
| 315 | /** |
| 316 | * omap_write_buf16 - write buffer to NAND controller |
| 317 | * @mtd: MTD device structure |
| 318 | * @buf: data buffer |
| 319 | * @len: number of bytes to write |
| 320 | */ |
| 321 | static void omap_write_buf16(struct mtd_info *mtd, const u_char * buf, int len) |
| 322 | { |
| 323 | struct omap_nand_info *info = container_of(mtd, |
| 324 | struct omap_nand_info, mtd); |
| 325 | u16 *p = (u16 *) buf; |
Sukumar Ghorai | 2c01946c | 2010-07-09 09:14:45 +0000 | [diff] [blame] | 326 | u32 status = 0; |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 327 | /* FIXME try bursts of writesw() or DMA ... */ |
| 328 | len >>= 1; |
| 329 | |
| 330 | while (len--) { |
vimal singh | 59e9c5a | 2009-07-13 16:26:24 +0530 | [diff] [blame] | 331 | iowrite16(*p++, info->nand.IO_ADDR_W); |
Sukumar Ghorai | 2c01946c | 2010-07-09 09:14:45 +0000 | [diff] [blame] | 332 | /* wait until buffer is available for write */ |
| 333 | do { |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 334 | status = readl(info->reg.gpmc_status) & |
Afzal Mohammed | 47f88af4 | 2012-09-29 18:20:11 +0530 | [diff] [blame] | 335 | STATUS_BUFF_EMPTY; |
Sukumar Ghorai | 2c01946c | 2010-07-09 09:14:45 +0000 | [diff] [blame] | 336 | } while (!status); |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 337 | } |
| 338 | } |
vimal singh | 59e9c5a | 2009-07-13 16:26:24 +0530 | [diff] [blame] | 339 | |
| 340 | /** |
| 341 | * omap_read_buf_pref - read data from NAND controller into buffer |
| 342 | * @mtd: MTD device structure |
| 343 | * @buf: buffer to store date |
| 344 | * @len: number of bytes to read |
| 345 | */ |
| 346 | static void omap_read_buf_pref(struct mtd_info *mtd, u_char *buf, int len) |
| 347 | { |
| 348 | struct omap_nand_info *info = container_of(mtd, |
| 349 | struct omap_nand_info, mtd); |
Sukumar Ghorai | 2c01946c | 2010-07-09 09:14:45 +0000 | [diff] [blame] | 350 | uint32_t r_count = 0; |
vimal singh | 59e9c5a | 2009-07-13 16:26:24 +0530 | [diff] [blame] | 351 | int ret = 0; |
| 352 | u32 *p = (u32 *)buf; |
| 353 | |
| 354 | /* take care of subpage reads */ |
Vimal Singh | c3341d0 | 2010-01-07 12:16:26 +0530 | [diff] [blame] | 355 | if (len % 4) { |
| 356 | if (info->nand.options & NAND_BUSWIDTH_16) |
| 357 | omap_read_buf16(mtd, buf, len % 4); |
| 358 | else |
| 359 | omap_read_buf8(mtd, buf, len % 4); |
| 360 | p = (u32 *) (buf + len % 4); |
| 361 | len -= len % 4; |
vimal singh | 59e9c5a | 2009-07-13 16:26:24 +0530 | [diff] [blame] | 362 | } |
vimal singh | 59e9c5a | 2009-07-13 16:26:24 +0530 | [diff] [blame] | 363 | |
| 364 | /* configure and start prefetch transfer */ |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 365 | ret = omap_prefetch_enable(info->gpmc_cs, |
| 366 | PREFETCH_FIFOTHRESHOLD_MAX, 0x0, len, 0x0, info); |
vimal singh | 59e9c5a | 2009-07-13 16:26:24 +0530 | [diff] [blame] | 367 | if (ret) { |
| 368 | /* PFPW engine is busy, use cpu copy method */ |
| 369 | if (info->nand.options & NAND_BUSWIDTH_16) |
Kishore Kadiyala | c5d8c0c | 2011-05-11 21:17:27 +0530 | [diff] [blame] | 370 | omap_read_buf16(mtd, (u_char *)p, len); |
vimal singh | 59e9c5a | 2009-07-13 16:26:24 +0530 | [diff] [blame] | 371 | else |
Kishore Kadiyala | c5d8c0c | 2011-05-11 21:17:27 +0530 | [diff] [blame] | 372 | omap_read_buf8(mtd, (u_char *)p, len); |
vimal singh | 59e9c5a | 2009-07-13 16:26:24 +0530 | [diff] [blame] | 373 | } else { |
| 374 | do { |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 375 | r_count = readl(info->reg.gpmc_prefetch_status); |
Afzal Mohammed | 47f88af4 | 2012-09-29 18:20:11 +0530 | [diff] [blame] | 376 | r_count = PREFETCH_STATUS_FIFO_CNT(r_count); |
Sukumar Ghorai | 2c01946c | 2010-07-09 09:14:45 +0000 | [diff] [blame] | 377 | r_count = r_count >> 2; |
| 378 | ioread32_rep(info->nand.IO_ADDR_R, p, r_count); |
vimal singh | 59e9c5a | 2009-07-13 16:26:24 +0530 | [diff] [blame] | 379 | p += r_count; |
| 380 | len -= r_count << 2; |
| 381 | } while (len); |
vimal singh | 59e9c5a | 2009-07-13 16:26:24 +0530 | [diff] [blame] | 382 | /* disable and stop the PFPW engine */ |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 383 | omap_prefetch_reset(info->gpmc_cs, info); |
vimal singh | 59e9c5a | 2009-07-13 16:26:24 +0530 | [diff] [blame] | 384 | } |
| 385 | } |
| 386 | |
| 387 | /** |
| 388 | * omap_write_buf_pref - write buffer to NAND controller |
| 389 | * @mtd: MTD device structure |
| 390 | * @buf: data buffer |
| 391 | * @len: number of bytes to write |
| 392 | */ |
| 393 | static void omap_write_buf_pref(struct mtd_info *mtd, |
| 394 | const u_char *buf, int len) |
| 395 | { |
| 396 | struct omap_nand_info *info = container_of(mtd, |
| 397 | struct omap_nand_info, mtd); |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 398 | uint32_t w_count = 0; |
vimal singh | 59e9c5a | 2009-07-13 16:26:24 +0530 | [diff] [blame] | 399 | int i = 0, ret = 0; |
Kishore Kadiyala | c5d8c0c | 2011-05-11 21:17:27 +0530 | [diff] [blame] | 400 | u16 *p = (u16 *)buf; |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 401 | unsigned long tim, limit; |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 402 | u32 val; |
vimal singh | 59e9c5a | 2009-07-13 16:26:24 +0530 | [diff] [blame] | 403 | |
| 404 | /* take care of subpage writes */ |
| 405 | if (len % 2 != 0) { |
Sukumar Ghorai | 2c01946c | 2010-07-09 09:14:45 +0000 | [diff] [blame] | 406 | writeb(*buf, info->nand.IO_ADDR_W); |
vimal singh | 59e9c5a | 2009-07-13 16:26:24 +0530 | [diff] [blame] | 407 | p = (u16 *)(buf + 1); |
| 408 | len--; |
| 409 | } |
| 410 | |
| 411 | /* configure and start prefetch transfer */ |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 412 | ret = omap_prefetch_enable(info->gpmc_cs, |
| 413 | PREFETCH_FIFOTHRESHOLD_MAX, 0x0, len, 0x1, info); |
vimal singh | 59e9c5a | 2009-07-13 16:26:24 +0530 | [diff] [blame] | 414 | if (ret) { |
| 415 | /* PFPW engine is busy, use cpu copy method */ |
| 416 | if (info->nand.options & NAND_BUSWIDTH_16) |
Kishore Kadiyala | c5d8c0c | 2011-05-11 21:17:27 +0530 | [diff] [blame] | 417 | omap_write_buf16(mtd, (u_char *)p, len); |
vimal singh | 59e9c5a | 2009-07-13 16:26:24 +0530 | [diff] [blame] | 418 | else |
Kishore Kadiyala | c5d8c0c | 2011-05-11 21:17:27 +0530 | [diff] [blame] | 419 | omap_write_buf8(mtd, (u_char *)p, len); |
vimal singh | 59e9c5a | 2009-07-13 16:26:24 +0530 | [diff] [blame] | 420 | } else { |
Sukumar Ghorai | 2c01946c | 2010-07-09 09:14:45 +0000 | [diff] [blame] | 421 | while (len) { |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 422 | w_count = readl(info->reg.gpmc_prefetch_status); |
Afzal Mohammed | 47f88af4 | 2012-09-29 18:20:11 +0530 | [diff] [blame] | 423 | w_count = PREFETCH_STATUS_FIFO_CNT(w_count); |
Sukumar Ghorai | 2c01946c | 2010-07-09 09:14:45 +0000 | [diff] [blame] | 424 | w_count = w_count >> 1; |
vimal singh | 59e9c5a | 2009-07-13 16:26:24 +0530 | [diff] [blame] | 425 | for (i = 0; (i < w_count) && len; i++, len -= 2) |
Sukumar Ghorai | 2c01946c | 2010-07-09 09:14:45 +0000 | [diff] [blame] | 426 | iowrite16(*p++, info->nand.IO_ADDR_W); |
vimal singh | 59e9c5a | 2009-07-13 16:26:24 +0530 | [diff] [blame] | 427 | } |
Sukumar Ghorai | 2c01946c | 2010-07-09 09:14:45 +0000 | [diff] [blame] | 428 | /* wait for data to flushed-out before reset the prefetch */ |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 429 | tim = 0; |
| 430 | limit = (loops_per_jiffy * |
| 431 | msecs_to_jiffies(OMAP_NAND_TIMEOUT_MS)); |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 432 | do { |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 433 | cpu_relax(); |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 434 | val = readl(info->reg.gpmc_prefetch_status); |
Afzal Mohammed | 47f88af4 | 2012-09-29 18:20:11 +0530 | [diff] [blame] | 435 | val = PREFETCH_STATUS_COUNT(val); |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 436 | } while (val && (tim++ < limit)); |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 437 | |
vimal singh | 59e9c5a | 2009-07-13 16:26:24 +0530 | [diff] [blame] | 438 | /* disable and stop the PFPW engine */ |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 439 | omap_prefetch_reset(info->gpmc_cs, info); |
vimal singh | 59e9c5a | 2009-07-13 16:26:24 +0530 | [diff] [blame] | 440 | } |
| 441 | } |
| 442 | |
vimal singh | dfe3289 | 2009-07-13 16:29:16 +0530 | [diff] [blame] | 443 | /* |
Russell King | 2df41d0 | 2012-04-25 00:19:39 +0100 | [diff] [blame] | 444 | * omap_nand_dma_callback: callback on the completion of dma transfer |
vimal singh | dfe3289 | 2009-07-13 16:29:16 +0530 | [diff] [blame] | 445 | * @data: pointer to completion data structure |
| 446 | */ |
Russell King | 763e735 | 2012-04-25 00:16:00 +0100 | [diff] [blame] | 447 | static void omap_nand_dma_callback(void *data) |
| 448 | { |
| 449 | complete((struct completion *) data); |
| 450 | } |
vimal singh | dfe3289 | 2009-07-13 16:29:16 +0530 | [diff] [blame] | 451 | |
| 452 | /* |
Peter Meerwald | 4cacbe2 | 2012-07-19 13:21:04 +0200 | [diff] [blame] | 453 | * omap_nand_dma_transfer: configure and start dma transfer |
vimal singh | dfe3289 | 2009-07-13 16:29:16 +0530 | [diff] [blame] | 454 | * @mtd: MTD device structure |
| 455 | * @addr: virtual address in RAM of source/destination |
| 456 | * @len: number of data bytes to be transferred |
| 457 | * @is_write: flag for read/write operation |
| 458 | */ |
| 459 | static inline int omap_nand_dma_transfer(struct mtd_info *mtd, void *addr, |
| 460 | unsigned int len, int is_write) |
| 461 | { |
| 462 | struct omap_nand_info *info = container_of(mtd, |
| 463 | struct omap_nand_info, mtd); |
Russell King | 2df41d0 | 2012-04-25 00:19:39 +0100 | [diff] [blame] | 464 | struct dma_async_tx_descriptor *tx; |
vimal singh | dfe3289 | 2009-07-13 16:29:16 +0530 | [diff] [blame] | 465 | enum dma_data_direction dir = is_write ? DMA_TO_DEVICE : |
| 466 | DMA_FROM_DEVICE; |
Russell King | 2df41d0 | 2012-04-25 00:19:39 +0100 | [diff] [blame] | 467 | struct scatterlist sg; |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 468 | unsigned long tim, limit; |
Russell King | 2df41d0 | 2012-04-25 00:19:39 +0100 | [diff] [blame] | 469 | unsigned n; |
| 470 | int ret; |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 471 | u32 val; |
vimal singh | dfe3289 | 2009-07-13 16:29:16 +0530 | [diff] [blame] | 472 | |
| 473 | if (addr >= high_memory) { |
| 474 | struct page *p1; |
| 475 | |
| 476 | if (((size_t)addr & PAGE_MASK) != |
| 477 | ((size_t)(addr + len - 1) & PAGE_MASK)) |
| 478 | goto out_copy; |
| 479 | p1 = vmalloc_to_page(addr); |
| 480 | if (!p1) |
| 481 | goto out_copy; |
| 482 | addr = page_address(p1) + ((size_t)addr & ~PAGE_MASK); |
| 483 | } |
| 484 | |
Russell King | 2df41d0 | 2012-04-25 00:19:39 +0100 | [diff] [blame] | 485 | sg_init_one(&sg, addr, len); |
| 486 | n = dma_map_sg(info->dma->device->dev, &sg, 1, dir); |
| 487 | if (n == 0) { |
vimal singh | dfe3289 | 2009-07-13 16:29:16 +0530 | [diff] [blame] | 488 | dev_err(&info->pdev->dev, |
| 489 | "Couldn't DMA map a %d byte buffer\n", len); |
| 490 | goto out_copy; |
| 491 | } |
| 492 | |
Russell King | 2df41d0 | 2012-04-25 00:19:39 +0100 | [diff] [blame] | 493 | tx = dmaengine_prep_slave_sg(info->dma, &sg, n, |
| 494 | is_write ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM, |
| 495 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
| 496 | if (!tx) |
| 497 | goto out_copy_unmap; |
| 498 | |
| 499 | tx->callback = omap_nand_dma_callback; |
| 500 | tx->callback_param = &info->comp; |
| 501 | dmaengine_submit(tx); |
| 502 | |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 503 | /* configure and start prefetch transfer */ |
| 504 | ret = omap_prefetch_enable(info->gpmc_cs, |
| 505 | PREFETCH_FIFOTHRESHOLD_MAX, 0x1, len, is_write, info); |
vimal singh | dfe3289 | 2009-07-13 16:29:16 +0530 | [diff] [blame] | 506 | if (ret) |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 507 | /* PFPW engine is busy, use cpu copy method */ |
Grazvydas Ignotas | d7efe22 | 2012-04-11 04:04:34 +0300 | [diff] [blame] | 508 | goto out_copy_unmap; |
vimal singh | dfe3289 | 2009-07-13 16:29:16 +0530 | [diff] [blame] | 509 | |
| 510 | init_completion(&info->comp); |
Russell King | 2df41d0 | 2012-04-25 00:19:39 +0100 | [diff] [blame] | 511 | dma_async_issue_pending(info->dma); |
vimal singh | dfe3289 | 2009-07-13 16:29:16 +0530 | [diff] [blame] | 512 | |
| 513 | /* setup and start DMA using dma_addr */ |
| 514 | wait_for_completion(&info->comp); |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 515 | tim = 0; |
| 516 | limit = (loops_per_jiffy * msecs_to_jiffies(OMAP_NAND_TIMEOUT_MS)); |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 517 | |
| 518 | do { |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 519 | cpu_relax(); |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 520 | val = readl(info->reg.gpmc_prefetch_status); |
Afzal Mohammed | 47f88af4 | 2012-09-29 18:20:11 +0530 | [diff] [blame] | 521 | val = PREFETCH_STATUS_COUNT(val); |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 522 | } while (val && (tim++ < limit)); |
vimal singh | dfe3289 | 2009-07-13 16:29:16 +0530 | [diff] [blame] | 523 | |
vimal singh | dfe3289 | 2009-07-13 16:29:16 +0530 | [diff] [blame] | 524 | /* disable and stop the PFPW engine */ |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 525 | omap_prefetch_reset(info->gpmc_cs, info); |
vimal singh | dfe3289 | 2009-07-13 16:29:16 +0530 | [diff] [blame] | 526 | |
Russell King | 2df41d0 | 2012-04-25 00:19:39 +0100 | [diff] [blame] | 527 | dma_unmap_sg(info->dma->device->dev, &sg, 1, dir); |
vimal singh | dfe3289 | 2009-07-13 16:29:16 +0530 | [diff] [blame] | 528 | return 0; |
| 529 | |
Grazvydas Ignotas | d7efe22 | 2012-04-11 04:04:34 +0300 | [diff] [blame] | 530 | out_copy_unmap: |
Russell King | 2df41d0 | 2012-04-25 00:19:39 +0100 | [diff] [blame] | 531 | dma_unmap_sg(info->dma->device->dev, &sg, 1, dir); |
vimal singh | dfe3289 | 2009-07-13 16:29:16 +0530 | [diff] [blame] | 532 | out_copy: |
| 533 | if (info->nand.options & NAND_BUSWIDTH_16) |
| 534 | is_write == 0 ? omap_read_buf16(mtd, (u_char *) addr, len) |
| 535 | : omap_write_buf16(mtd, (u_char *) addr, len); |
| 536 | else |
| 537 | is_write == 0 ? omap_read_buf8(mtd, (u_char *) addr, len) |
| 538 | : omap_write_buf8(mtd, (u_char *) addr, len); |
| 539 | return 0; |
| 540 | } |
vimal singh | dfe3289 | 2009-07-13 16:29:16 +0530 | [diff] [blame] | 541 | |
| 542 | /** |
| 543 | * omap_read_buf_dma_pref - read data from NAND controller into buffer |
| 544 | * @mtd: MTD device structure |
| 545 | * @buf: buffer to store date |
| 546 | * @len: number of bytes to read |
| 547 | */ |
| 548 | static void omap_read_buf_dma_pref(struct mtd_info *mtd, u_char *buf, int len) |
| 549 | { |
| 550 | if (len <= mtd->oobsize) |
| 551 | omap_read_buf_pref(mtd, buf, len); |
| 552 | else |
| 553 | /* start transfer in DMA mode */ |
| 554 | omap_nand_dma_transfer(mtd, buf, len, 0x0); |
| 555 | } |
| 556 | |
| 557 | /** |
| 558 | * omap_write_buf_dma_pref - write buffer to NAND controller |
| 559 | * @mtd: MTD device structure |
| 560 | * @buf: data buffer |
| 561 | * @len: number of bytes to write |
| 562 | */ |
| 563 | static void omap_write_buf_dma_pref(struct mtd_info *mtd, |
| 564 | const u_char *buf, int len) |
| 565 | { |
| 566 | if (len <= mtd->oobsize) |
| 567 | omap_write_buf_pref(mtd, buf, len); |
| 568 | else |
| 569 | /* start transfer in DMA mode */ |
Vimal Singh | bdaefc4 | 2010-01-05 12:49:24 +0530 | [diff] [blame] | 570 | omap_nand_dma_transfer(mtd, (u_char *) buf, len, 0x1); |
vimal singh | dfe3289 | 2009-07-13 16:29:16 +0530 | [diff] [blame] | 571 | } |
| 572 | |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 573 | /* |
Peter Meerwald | 4cacbe2 | 2012-07-19 13:21:04 +0200 | [diff] [blame] | 574 | * omap_nand_irq - GPMC irq handler |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 575 | * @this_irq: gpmc irq number |
| 576 | * @dev: omap_nand_info structure pointer is passed here |
| 577 | */ |
| 578 | static irqreturn_t omap_nand_irq(int this_irq, void *dev) |
| 579 | { |
| 580 | struct omap_nand_info *info = (struct omap_nand_info *) dev; |
| 581 | u32 bytes; |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 582 | |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 583 | bytes = readl(info->reg.gpmc_prefetch_status); |
Afzal Mohammed | 47f88af4 | 2012-09-29 18:20:11 +0530 | [diff] [blame] | 584 | bytes = PREFETCH_STATUS_FIFO_CNT(bytes); |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 585 | bytes = bytes & 0xFFFC; /* io in multiple of 4 bytes */ |
| 586 | if (info->iomode == OMAP_NAND_IO_WRITE) { /* checks for write io */ |
Afzal Mohammed | 5c46845 | 2012-08-30 12:53:24 -0700 | [diff] [blame] | 587 | if (this_irq == info->gpmc_irq_count) |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 588 | goto done; |
| 589 | |
| 590 | if (info->buf_len && (info->buf_len < bytes)) |
| 591 | bytes = info->buf_len; |
| 592 | else if (!info->buf_len) |
| 593 | bytes = 0; |
| 594 | iowrite32_rep(info->nand.IO_ADDR_W, |
| 595 | (u32 *)info->buf, bytes >> 2); |
| 596 | info->buf = info->buf + bytes; |
| 597 | info->buf_len -= bytes; |
| 598 | |
| 599 | } else { |
| 600 | ioread32_rep(info->nand.IO_ADDR_R, |
| 601 | (u32 *)info->buf, bytes >> 2); |
| 602 | info->buf = info->buf + bytes; |
| 603 | |
Afzal Mohammed | 5c46845 | 2012-08-30 12:53:24 -0700 | [diff] [blame] | 604 | if (this_irq == info->gpmc_irq_count) |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 605 | goto done; |
| 606 | } |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 607 | |
| 608 | return IRQ_HANDLED; |
| 609 | |
| 610 | done: |
| 611 | complete(&info->comp); |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 612 | |
Afzal Mohammed | 5c46845 | 2012-08-30 12:53:24 -0700 | [diff] [blame] | 613 | disable_irq_nosync(info->gpmc_irq_fifo); |
| 614 | disable_irq_nosync(info->gpmc_irq_count); |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 615 | |
| 616 | return IRQ_HANDLED; |
| 617 | } |
| 618 | |
| 619 | /* |
| 620 | * omap_read_buf_irq_pref - read data from NAND controller into buffer |
| 621 | * @mtd: MTD device structure |
| 622 | * @buf: buffer to store date |
| 623 | * @len: number of bytes to read |
| 624 | */ |
| 625 | static void omap_read_buf_irq_pref(struct mtd_info *mtd, u_char *buf, int len) |
| 626 | { |
| 627 | struct omap_nand_info *info = container_of(mtd, |
| 628 | struct omap_nand_info, mtd); |
| 629 | int ret = 0; |
| 630 | |
| 631 | if (len <= mtd->oobsize) { |
| 632 | omap_read_buf_pref(mtd, buf, len); |
| 633 | return; |
| 634 | } |
| 635 | |
| 636 | info->iomode = OMAP_NAND_IO_READ; |
| 637 | info->buf = buf; |
| 638 | init_completion(&info->comp); |
| 639 | |
| 640 | /* configure and start prefetch transfer */ |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 641 | ret = omap_prefetch_enable(info->gpmc_cs, |
| 642 | PREFETCH_FIFOTHRESHOLD_MAX/2, 0x0, len, 0x0, info); |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 643 | if (ret) |
| 644 | /* PFPW engine is busy, use cpu copy method */ |
| 645 | goto out_copy; |
| 646 | |
| 647 | info->buf_len = len; |
Afzal Mohammed | 5c46845 | 2012-08-30 12:53:24 -0700 | [diff] [blame] | 648 | |
| 649 | enable_irq(info->gpmc_irq_count); |
| 650 | enable_irq(info->gpmc_irq_fifo); |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 651 | |
| 652 | /* waiting for read to complete */ |
| 653 | wait_for_completion(&info->comp); |
| 654 | |
| 655 | /* disable and stop the PFPW engine */ |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 656 | omap_prefetch_reset(info->gpmc_cs, info); |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 657 | return; |
| 658 | |
| 659 | out_copy: |
| 660 | if (info->nand.options & NAND_BUSWIDTH_16) |
| 661 | omap_read_buf16(mtd, buf, len); |
| 662 | else |
| 663 | omap_read_buf8(mtd, buf, len); |
| 664 | } |
| 665 | |
| 666 | /* |
| 667 | * omap_write_buf_irq_pref - write buffer to NAND controller |
| 668 | * @mtd: MTD device structure |
| 669 | * @buf: data buffer |
| 670 | * @len: number of bytes to write |
| 671 | */ |
| 672 | static void omap_write_buf_irq_pref(struct mtd_info *mtd, |
| 673 | const u_char *buf, int len) |
| 674 | { |
| 675 | struct omap_nand_info *info = container_of(mtd, |
| 676 | struct omap_nand_info, mtd); |
| 677 | int ret = 0; |
| 678 | unsigned long tim, limit; |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 679 | u32 val; |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 680 | |
| 681 | if (len <= mtd->oobsize) { |
| 682 | omap_write_buf_pref(mtd, buf, len); |
| 683 | return; |
| 684 | } |
| 685 | |
| 686 | info->iomode = OMAP_NAND_IO_WRITE; |
| 687 | info->buf = (u_char *) buf; |
| 688 | init_completion(&info->comp); |
| 689 | |
Sukumar Ghorai | 317379a | 2011-01-28 15:42:07 +0530 | [diff] [blame] | 690 | /* configure and start prefetch transfer : size=24 */ |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 691 | ret = omap_prefetch_enable(info->gpmc_cs, |
| 692 | (PREFETCH_FIFOTHRESHOLD_MAX * 3) / 8, 0x0, len, 0x1, info); |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 693 | if (ret) |
| 694 | /* PFPW engine is busy, use cpu copy method */ |
| 695 | goto out_copy; |
| 696 | |
| 697 | info->buf_len = len; |
Afzal Mohammed | 5c46845 | 2012-08-30 12:53:24 -0700 | [diff] [blame] | 698 | |
| 699 | enable_irq(info->gpmc_irq_count); |
| 700 | enable_irq(info->gpmc_irq_fifo); |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 701 | |
| 702 | /* waiting for write to complete */ |
| 703 | wait_for_completion(&info->comp); |
Afzal Mohammed | 5c46845 | 2012-08-30 12:53:24 -0700 | [diff] [blame] | 704 | |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 705 | /* wait for data to flushed-out before reset the prefetch */ |
| 706 | tim = 0; |
| 707 | limit = (loops_per_jiffy * msecs_to_jiffies(OMAP_NAND_TIMEOUT_MS)); |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 708 | do { |
| 709 | val = readl(info->reg.gpmc_prefetch_status); |
Afzal Mohammed | 47f88af4 | 2012-09-29 18:20:11 +0530 | [diff] [blame] | 710 | val = PREFETCH_STATUS_COUNT(val); |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 711 | cpu_relax(); |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 712 | } while (val && (tim++ < limit)); |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 713 | |
| 714 | /* disable and stop the PFPW engine */ |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 715 | omap_prefetch_reset(info->gpmc_cs, info); |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 716 | return; |
| 717 | |
| 718 | out_copy: |
| 719 | if (info->nand.options & NAND_BUSWIDTH_16) |
| 720 | omap_write_buf16(mtd, buf, len); |
| 721 | else |
| 722 | omap_write_buf8(mtd, buf, len); |
| 723 | } |
| 724 | |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 725 | /** |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 726 | * gen_true_ecc - This function will generate true ECC value |
| 727 | * @ecc_buf: buffer to store ecc code |
| 728 | * |
| 729 | * This generated true ECC value can be used when correcting |
| 730 | * data read from NAND flash memory core |
| 731 | */ |
| 732 | static void gen_true_ecc(u8 *ecc_buf) |
| 733 | { |
| 734 | u32 tmp = ecc_buf[0] | (ecc_buf[1] << 16) | |
| 735 | ((ecc_buf[2] & 0xF0) << 20) | ((ecc_buf[2] & 0x0F) << 8); |
| 736 | |
| 737 | ecc_buf[0] = ~(P64o(tmp) | P64e(tmp) | P32o(tmp) | P32e(tmp) | |
| 738 | P16o(tmp) | P16e(tmp) | P8o(tmp) | P8e(tmp)); |
| 739 | ecc_buf[1] = ~(P1024o(tmp) | P1024e(tmp) | P512o(tmp) | P512e(tmp) | |
| 740 | P256o(tmp) | P256e(tmp) | P128o(tmp) | P128e(tmp)); |
| 741 | ecc_buf[2] = ~(P4o(tmp) | P4e(tmp) | P2o(tmp) | P2e(tmp) | P1o(tmp) | |
| 742 | P1e(tmp) | P2048o(tmp) | P2048e(tmp)); |
| 743 | } |
| 744 | |
| 745 | /** |
| 746 | * omap_compare_ecc - Detect (2 bits) and correct (1 bit) error in data |
| 747 | * @ecc_data1: ecc code from nand spare area |
| 748 | * @ecc_data2: ecc code from hardware register obtained from hardware ecc |
| 749 | * @page_data: page data |
| 750 | * |
| 751 | * This function compares two ECC's and indicates if there is an error. |
| 752 | * If the error can be corrected it will be corrected to the buffer. |
John Ogness | 74f1b72 | 2011-02-28 13:12:46 +0100 | [diff] [blame] | 753 | * If there is no error, %0 is returned. If there is an error but it |
| 754 | * was corrected, %1 is returned. Otherwise, %-1 is returned. |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 755 | */ |
| 756 | static int omap_compare_ecc(u8 *ecc_data1, /* read from NAND memory */ |
| 757 | u8 *ecc_data2, /* read from register */ |
| 758 | u8 *page_data) |
| 759 | { |
| 760 | uint i; |
| 761 | u8 tmp0_bit[8], tmp1_bit[8], tmp2_bit[8]; |
| 762 | u8 comp0_bit[8], comp1_bit[8], comp2_bit[8]; |
| 763 | u8 ecc_bit[24]; |
| 764 | u8 ecc_sum = 0; |
| 765 | u8 find_bit = 0; |
| 766 | uint find_byte = 0; |
| 767 | int isEccFF; |
| 768 | |
| 769 | isEccFF = ((*(u32 *)ecc_data1 & 0xFFFFFF) == 0xFFFFFF); |
| 770 | |
| 771 | gen_true_ecc(ecc_data1); |
| 772 | gen_true_ecc(ecc_data2); |
| 773 | |
| 774 | for (i = 0; i <= 2; i++) { |
| 775 | *(ecc_data1 + i) = ~(*(ecc_data1 + i)); |
| 776 | *(ecc_data2 + i) = ~(*(ecc_data2 + i)); |
| 777 | } |
| 778 | |
| 779 | for (i = 0; i < 8; i++) { |
| 780 | tmp0_bit[i] = *ecc_data1 % 2; |
| 781 | *ecc_data1 = *ecc_data1 / 2; |
| 782 | } |
| 783 | |
| 784 | for (i = 0; i < 8; i++) { |
| 785 | tmp1_bit[i] = *(ecc_data1 + 1) % 2; |
| 786 | *(ecc_data1 + 1) = *(ecc_data1 + 1) / 2; |
| 787 | } |
| 788 | |
| 789 | for (i = 0; i < 8; i++) { |
| 790 | tmp2_bit[i] = *(ecc_data1 + 2) % 2; |
| 791 | *(ecc_data1 + 2) = *(ecc_data1 + 2) / 2; |
| 792 | } |
| 793 | |
| 794 | for (i = 0; i < 8; i++) { |
| 795 | comp0_bit[i] = *ecc_data2 % 2; |
| 796 | *ecc_data2 = *ecc_data2 / 2; |
| 797 | } |
| 798 | |
| 799 | for (i = 0; i < 8; i++) { |
| 800 | comp1_bit[i] = *(ecc_data2 + 1) % 2; |
| 801 | *(ecc_data2 + 1) = *(ecc_data2 + 1) / 2; |
| 802 | } |
| 803 | |
| 804 | for (i = 0; i < 8; i++) { |
| 805 | comp2_bit[i] = *(ecc_data2 + 2) % 2; |
| 806 | *(ecc_data2 + 2) = *(ecc_data2 + 2) / 2; |
| 807 | } |
| 808 | |
| 809 | for (i = 0; i < 6; i++) |
| 810 | ecc_bit[i] = tmp2_bit[i + 2] ^ comp2_bit[i + 2]; |
| 811 | |
| 812 | for (i = 0; i < 8; i++) |
| 813 | ecc_bit[i + 6] = tmp0_bit[i] ^ comp0_bit[i]; |
| 814 | |
| 815 | for (i = 0; i < 8; i++) |
| 816 | ecc_bit[i + 14] = tmp1_bit[i] ^ comp1_bit[i]; |
| 817 | |
| 818 | ecc_bit[22] = tmp2_bit[0] ^ comp2_bit[0]; |
| 819 | ecc_bit[23] = tmp2_bit[1] ^ comp2_bit[1]; |
| 820 | |
| 821 | for (i = 0; i < 24; i++) |
| 822 | ecc_sum += ecc_bit[i]; |
| 823 | |
| 824 | switch (ecc_sum) { |
| 825 | case 0: |
| 826 | /* Not reached because this function is not called if |
| 827 | * ECC values are equal |
| 828 | */ |
| 829 | return 0; |
| 830 | |
| 831 | case 1: |
| 832 | /* Uncorrectable error */ |
Brian Norris | 289c052 | 2011-07-19 10:06:09 -0700 | [diff] [blame] | 833 | pr_debug("ECC UNCORRECTED_ERROR 1\n"); |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 834 | return -1; |
| 835 | |
| 836 | case 11: |
| 837 | /* UN-Correctable error */ |
Brian Norris | 289c052 | 2011-07-19 10:06:09 -0700 | [diff] [blame] | 838 | pr_debug("ECC UNCORRECTED_ERROR B\n"); |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 839 | return -1; |
| 840 | |
| 841 | case 12: |
| 842 | /* Correctable error */ |
| 843 | find_byte = (ecc_bit[23] << 8) + |
| 844 | (ecc_bit[21] << 7) + |
| 845 | (ecc_bit[19] << 6) + |
| 846 | (ecc_bit[17] << 5) + |
| 847 | (ecc_bit[15] << 4) + |
| 848 | (ecc_bit[13] << 3) + |
| 849 | (ecc_bit[11] << 2) + |
| 850 | (ecc_bit[9] << 1) + |
| 851 | ecc_bit[7]; |
| 852 | |
| 853 | find_bit = (ecc_bit[5] << 2) + (ecc_bit[3] << 1) + ecc_bit[1]; |
| 854 | |
Brian Norris | 0a32a10 | 2011-07-19 10:06:10 -0700 | [diff] [blame] | 855 | pr_debug("Correcting single bit ECC error at offset: " |
| 856 | "%d, bit: %d\n", find_byte, find_bit); |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 857 | |
| 858 | page_data[find_byte] ^= (1 << find_bit); |
| 859 | |
John Ogness | 74f1b72 | 2011-02-28 13:12:46 +0100 | [diff] [blame] | 860 | return 1; |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 861 | default: |
| 862 | if (isEccFF) { |
| 863 | if (ecc_data2[0] == 0 && |
| 864 | ecc_data2[1] == 0 && |
| 865 | ecc_data2[2] == 0) |
| 866 | return 0; |
| 867 | } |
Brian Norris | 289c052 | 2011-07-19 10:06:09 -0700 | [diff] [blame] | 868 | pr_debug("UNCORRECTED_ERROR default\n"); |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 869 | return -1; |
| 870 | } |
| 871 | } |
| 872 | |
| 873 | /** |
| 874 | * omap_correct_data - Compares the ECC read with HW generated ECC |
| 875 | * @mtd: MTD device structure |
| 876 | * @dat: page data |
| 877 | * @read_ecc: ecc read from nand flash |
| 878 | * @calc_ecc: ecc read from HW ECC registers |
| 879 | * |
| 880 | * Compares the ecc read from nand spare area with ECC registers values |
John Ogness | 74f1b72 | 2011-02-28 13:12:46 +0100 | [diff] [blame] | 881 | * and if ECC's mismatched, it will call 'omap_compare_ecc' for error |
| 882 | * detection and correction. If there are no errors, %0 is returned. If |
| 883 | * there were errors and all of the errors were corrected, the number of |
| 884 | * corrected errors is returned. If uncorrectable errors exist, %-1 is |
| 885 | * returned. |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 886 | */ |
| 887 | static int omap_correct_data(struct mtd_info *mtd, u_char *dat, |
| 888 | u_char *read_ecc, u_char *calc_ecc) |
| 889 | { |
| 890 | struct omap_nand_info *info = container_of(mtd, struct omap_nand_info, |
| 891 | mtd); |
| 892 | int blockCnt = 0, i = 0, ret = 0; |
John Ogness | 74f1b72 | 2011-02-28 13:12:46 +0100 | [diff] [blame] | 893 | int stat = 0; |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 894 | |
| 895 | /* Ex NAND_ECC_HW12_2048 */ |
| 896 | if ((info->nand.ecc.mode == NAND_ECC_HW) && |
| 897 | (info->nand.ecc.size == 2048)) |
| 898 | blockCnt = 4; |
| 899 | else |
| 900 | blockCnt = 1; |
| 901 | |
| 902 | for (i = 0; i < blockCnt; i++) { |
| 903 | if (memcmp(read_ecc, calc_ecc, 3) != 0) { |
| 904 | ret = omap_compare_ecc(read_ecc, calc_ecc, dat); |
| 905 | if (ret < 0) |
| 906 | return ret; |
John Ogness | 74f1b72 | 2011-02-28 13:12:46 +0100 | [diff] [blame] | 907 | /* keep track of the number of corrected errors */ |
| 908 | stat += ret; |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 909 | } |
| 910 | read_ecc += 3; |
| 911 | calc_ecc += 3; |
| 912 | dat += 512; |
| 913 | } |
John Ogness | 74f1b72 | 2011-02-28 13:12:46 +0100 | [diff] [blame] | 914 | return stat; |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 915 | } |
| 916 | |
| 917 | /** |
| 918 | * omap_calcuate_ecc - Generate non-inverted ECC bytes. |
| 919 | * @mtd: MTD device structure |
| 920 | * @dat: The pointer to data on which ecc is computed |
| 921 | * @ecc_code: The ecc_code buffer |
| 922 | * |
| 923 | * Using noninverted ECC can be considered ugly since writing a blank |
| 924 | * page ie. padding will clear the ECC bytes. This is no problem as long |
| 925 | * nobody is trying to write data on the seemingly unused page. Reading |
| 926 | * an erased page will produce an ECC mismatch between generated and read |
| 927 | * ECC bytes that has to be dealt with separately. |
| 928 | */ |
| 929 | static int omap_calculate_ecc(struct mtd_info *mtd, const u_char *dat, |
| 930 | u_char *ecc_code) |
| 931 | { |
| 932 | struct omap_nand_info *info = container_of(mtd, struct omap_nand_info, |
| 933 | mtd); |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 934 | u32 val; |
| 935 | |
| 936 | val = readl(info->reg.gpmc_ecc_config); |
| 937 | if (((val >> ECC_CONFIG_CS_SHIFT) & ~CS_MASK) != info->gpmc_cs) |
| 938 | return -EINVAL; |
| 939 | |
| 940 | /* read ecc result */ |
| 941 | val = readl(info->reg.gpmc_ecc1_result); |
| 942 | *ecc_code++ = val; /* P128e, ..., P1e */ |
| 943 | *ecc_code++ = val >> 16; /* P128o, ..., P1o */ |
| 944 | /* P2048o, P1024o, P512o, P256o, P2048e, P1024e, P512e, P256e */ |
| 945 | *ecc_code++ = ((val >> 8) & 0x0f) | ((val >> 20) & 0xf0); |
| 946 | |
| 947 | return 0; |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 948 | } |
| 949 | |
| 950 | /** |
| 951 | * omap_enable_hwecc - This function enables the hardware ecc functionality |
| 952 | * @mtd: MTD device structure |
| 953 | * @mode: Read/Write mode |
| 954 | */ |
| 955 | static void omap_enable_hwecc(struct mtd_info *mtd, int mode) |
| 956 | { |
| 957 | struct omap_nand_info *info = container_of(mtd, struct omap_nand_info, |
| 958 | mtd); |
| 959 | struct nand_chip *chip = mtd->priv; |
| 960 | unsigned int dev_width = (chip->options & NAND_BUSWIDTH_16) ? 1 : 0; |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 961 | u32 val; |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 962 | |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 963 | /* clear ecc and enable bits */ |
| 964 | val = ECCCLEAR | ECC1; |
| 965 | writel(val, info->reg.gpmc_ecc_control); |
| 966 | |
| 967 | /* program ecc and result sizes */ |
| 968 | val = ((((info->nand.ecc.size >> 1) - 1) << ECCSIZE1_SHIFT) | |
| 969 | ECC1RESULTSIZE); |
| 970 | writel(val, info->reg.gpmc_ecc_size_config); |
| 971 | |
| 972 | switch (mode) { |
| 973 | case NAND_ECC_READ: |
| 974 | case NAND_ECC_WRITE: |
| 975 | writel(ECCCLEAR | ECC1, info->reg.gpmc_ecc_control); |
| 976 | break; |
| 977 | case NAND_ECC_READSYN: |
| 978 | writel(ECCCLEAR, info->reg.gpmc_ecc_control); |
| 979 | break; |
| 980 | default: |
| 981 | dev_info(&info->pdev->dev, |
| 982 | "error: unrecognized Mode[%d]!\n", mode); |
| 983 | break; |
| 984 | } |
| 985 | |
| 986 | /* (ECC 16 or 8 bit col) | ( CS ) | ECC Enable */ |
| 987 | val = (dev_width << 7) | (info->gpmc_cs << 1) | (0x1); |
| 988 | writel(val, info->reg.gpmc_ecc_config); |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 989 | } |
Sukumar Ghorai | 2c01946c | 2010-07-09 09:14:45 +0000 | [diff] [blame] | 990 | |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 991 | /** |
| 992 | * omap_wait - wait until the command is done |
| 993 | * @mtd: MTD device structure |
| 994 | * @chip: NAND Chip structure |
| 995 | * |
| 996 | * Wait function is called during Program and erase operations and |
| 997 | * the way it is called from MTD layer, we should wait till the NAND |
| 998 | * chip is ready after the programming/erase operation has completed. |
| 999 | * |
| 1000 | * Erase can take up to 400ms and program up to 20ms according to |
| 1001 | * general NAND and SmartMedia specs |
| 1002 | */ |
| 1003 | static int omap_wait(struct mtd_info *mtd, struct nand_chip *chip) |
| 1004 | { |
| 1005 | struct nand_chip *this = mtd->priv; |
| 1006 | struct omap_nand_info *info = container_of(mtd, struct omap_nand_info, |
| 1007 | mtd); |
| 1008 | unsigned long timeo = jiffies; |
Ivan Djelic | a9c465f | 2012-04-17 13:11:53 +0200 | [diff] [blame] | 1009 | int status, state = this->state; |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 1010 | |
| 1011 | if (state == FL_ERASING) |
Toan Pham | 4ff6772 | 2013-03-15 10:44:59 -0700 | [diff] [blame] | 1012 | timeo += msecs_to_jiffies(400); |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 1013 | else |
Toan Pham | 4ff6772 | 2013-03-15 10:44:59 -0700 | [diff] [blame] | 1014 | timeo += msecs_to_jiffies(20); |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 1015 | |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 1016 | writeb(NAND_CMD_STATUS & 0xFF, info->reg.gpmc_nand_command); |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 1017 | while (time_before(jiffies, timeo)) { |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 1018 | status = readb(info->reg.gpmc_nand_data); |
vimal singh | c276aca | 2009-06-27 11:07:06 +0530 | [diff] [blame] | 1019 | if (status & NAND_STATUS_READY) |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 1020 | break; |
vimal singh | c276aca | 2009-06-27 11:07:06 +0530 | [diff] [blame] | 1021 | cond_resched(); |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 1022 | } |
Ivan Djelic | a9c465f | 2012-04-17 13:11:53 +0200 | [diff] [blame] | 1023 | |
Afzal Mohammed | 4ea1e4b | 2012-09-29 11:22:21 +0530 | [diff] [blame] | 1024 | status = readb(info->reg.gpmc_nand_data); |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 1025 | return status; |
| 1026 | } |
| 1027 | |
| 1028 | /** |
| 1029 | * omap_dev_ready - calls the platform specific dev_ready function |
| 1030 | * @mtd: MTD device structure |
| 1031 | */ |
| 1032 | static int omap_dev_ready(struct mtd_info *mtd) |
| 1033 | { |
Sukumar Ghorai | 2c01946c | 2010-07-09 09:14:45 +0000 | [diff] [blame] | 1034 | unsigned int val = 0; |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 1035 | struct omap_nand_info *info = container_of(mtd, struct omap_nand_info, |
| 1036 | mtd); |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 1037 | |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 1038 | val = readl(info->reg.gpmc_status); |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 1039 | |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 1040 | if ((val & 0x100) == 0x100) { |
| 1041 | return 1; |
| 1042 | } else { |
| 1043 | return 0; |
| 1044 | } |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 1045 | } |
| 1046 | |
Pekon Gupta | a919e51 | 2013-10-24 18:20:21 +0530 | [diff] [blame] | 1047 | #if defined(CONFIG_MTD_NAND_ECC_BCH) || defined(CONFIG_MTD_NAND_OMAP_BCH) |
Ivan Djelic | 0e618ef | 2012-04-30 12:17:18 +0200 | [diff] [blame] | 1048 | /** |
| 1049 | * omap3_enable_hwecc_bch - Program OMAP3 GPMC to perform BCH ECC correction |
| 1050 | * @mtd: MTD device structure |
| 1051 | * @mode: Read/Write mode |
Philip Avinash | 62116e5 | 2013-01-04 13:26:51 +0530 | [diff] [blame] | 1052 | * |
| 1053 | * When using BCH, sector size is hardcoded to 512 bytes. |
| 1054 | * Using wrapping mode 6 both for reading and writing if ELM module not uses |
| 1055 | * for error correction. |
| 1056 | * On writing, |
| 1057 | * eccsize0 = 0 (no additional protected byte in spare area) |
| 1058 | * eccsize1 = 32 (skip 32 nibbles = 16 bytes per sector in spare area) |
Ivan Djelic | 0e618ef | 2012-04-30 12:17:18 +0200 | [diff] [blame] | 1059 | */ |
| 1060 | static void omap3_enable_hwecc_bch(struct mtd_info *mtd, int mode) |
| 1061 | { |
| 1062 | int nerrors; |
Afzal Mohammed | 2ef9f3d | 2012-10-04 19:03:06 +0530 | [diff] [blame] | 1063 | unsigned int dev_width, nsectors; |
Ivan Djelic | 0e618ef | 2012-04-30 12:17:18 +0200 | [diff] [blame] | 1064 | struct omap_nand_info *info = container_of(mtd, struct omap_nand_info, |
| 1065 | mtd); |
| 1066 | struct nand_chip *chip = mtd->priv; |
Philip Avinash | 62116e5 | 2013-01-04 13:26:51 +0530 | [diff] [blame] | 1067 | u32 val, wr_mode; |
| 1068 | unsigned int ecc_size1, ecc_size0; |
Ivan Djelic | 0e618ef | 2012-04-30 12:17:18 +0200 | [diff] [blame] | 1069 | |
Philip Avinash | 62116e5 | 2013-01-04 13:26:51 +0530 | [diff] [blame] | 1070 | /* Using wrapping mode 6 for writing */ |
| 1071 | wr_mode = BCH_WRAPMODE_6; |
| 1072 | |
Ivan Djelic | 0e618ef | 2012-04-30 12:17:18 +0200 | [diff] [blame] | 1073 | /* |
Philip Avinash | 62116e5 | 2013-01-04 13:26:51 +0530 | [diff] [blame] | 1074 | * ECC engine enabled for valid ecc_size0 nibbles |
| 1075 | * and disabled for ecc_size1 nibbles. |
Ivan Djelic | 0e618ef | 2012-04-30 12:17:18 +0200 | [diff] [blame] | 1076 | */ |
Philip Avinash | 62116e5 | 2013-01-04 13:26:51 +0530 | [diff] [blame] | 1077 | ecc_size0 = BCH_ECC_SIZE0; |
| 1078 | ecc_size1 = BCH_ECC_SIZE1; |
| 1079 | |
| 1080 | /* Perform ecc calculation on 512-byte sector */ |
| 1081 | nsectors = 1; |
| 1082 | |
| 1083 | /* Update number of error correction */ |
| 1084 | nerrors = info->nand.ecc.strength; |
| 1085 | |
| 1086 | /* Multi sector reading/writing for NAND flash with page size < 4096 */ |
| 1087 | if (info->is_elm_used && (mtd->writesize <= 4096)) { |
| 1088 | if (mode == NAND_ECC_READ) { |
| 1089 | /* Using wrapping mode 1 for reading */ |
| 1090 | wr_mode = BCH_WRAPMODE_1; |
| 1091 | |
| 1092 | /* |
| 1093 | * ECC engine enabled for ecc_size0 nibbles |
| 1094 | * and disabled for ecc_size1 nibbles. |
| 1095 | */ |
| 1096 | ecc_size0 = (nerrors == 8) ? |
| 1097 | BCH8R_ECC_SIZE0 : BCH4R_ECC_SIZE0; |
| 1098 | ecc_size1 = (nerrors == 8) ? |
| 1099 | BCH8R_ECC_SIZE1 : BCH4R_ECC_SIZE1; |
| 1100 | } |
| 1101 | |
| 1102 | /* Perform ecc calculation for one page (< 4096) */ |
| 1103 | nsectors = info->nand.ecc.steps; |
| 1104 | } |
Afzal Mohammed | 2ef9f3d | 2012-10-04 19:03:06 +0530 | [diff] [blame] | 1105 | |
| 1106 | writel(ECC1, info->reg.gpmc_ecc_control); |
| 1107 | |
Philip Avinash | 62116e5 | 2013-01-04 13:26:51 +0530 | [diff] [blame] | 1108 | /* Configure ecc size for BCH */ |
| 1109 | val = (ecc_size1 << ECCSIZE1_SHIFT) | (ecc_size0 << ECCSIZE0_SHIFT); |
Afzal Mohammed | 2ef9f3d | 2012-10-04 19:03:06 +0530 | [diff] [blame] | 1110 | writel(val, info->reg.gpmc_ecc_size_config); |
| 1111 | |
Philip Avinash | 62116e5 | 2013-01-04 13:26:51 +0530 | [diff] [blame] | 1112 | dev_width = (chip->options & NAND_BUSWIDTH_16) ? 1 : 0; |
| 1113 | |
Afzal Mohammed | 2ef9f3d | 2012-10-04 19:03:06 +0530 | [diff] [blame] | 1114 | /* BCH configuration */ |
| 1115 | val = ((1 << 16) | /* enable BCH */ |
| 1116 | (((nerrors == 8) ? 1 : 0) << 12) | /* 8 or 4 bits */ |
Philip Avinash | 62116e5 | 2013-01-04 13:26:51 +0530 | [diff] [blame] | 1117 | (wr_mode << 8) | /* wrap mode */ |
Afzal Mohammed | 2ef9f3d | 2012-10-04 19:03:06 +0530 | [diff] [blame] | 1118 | (dev_width << 7) | /* bus width */ |
| 1119 | (((nsectors-1) & 0x7) << 4) | /* number of sectors */ |
| 1120 | (info->gpmc_cs << 1) | /* ECC CS */ |
| 1121 | (0x1)); /* enable ECC */ |
| 1122 | |
| 1123 | writel(val, info->reg.gpmc_ecc_config); |
| 1124 | |
Philip Avinash | 62116e5 | 2013-01-04 13:26:51 +0530 | [diff] [blame] | 1125 | /* Clear ecc and enable bits */ |
Afzal Mohammed | 2ef9f3d | 2012-10-04 19:03:06 +0530 | [diff] [blame] | 1126 | writel(ECCCLEAR | ECC1, info->reg.gpmc_ecc_control); |
Ivan Djelic | 0e618ef | 2012-04-30 12:17:18 +0200 | [diff] [blame] | 1127 | } |
Pekon Gupta | a919e51 | 2013-10-24 18:20:21 +0530 | [diff] [blame] | 1128 | #endif |
Ivan Djelic | 0e618ef | 2012-04-30 12:17:18 +0200 | [diff] [blame] | 1129 | |
Pekon Gupta | a919e51 | 2013-10-24 18:20:21 +0530 | [diff] [blame] | 1130 | #ifdef CONFIG_MTD_NAND_ECC_BCH |
Ivan Djelic | 0e618ef | 2012-04-30 12:17:18 +0200 | [diff] [blame] | 1131 | /** |
| 1132 | * omap3_calculate_ecc_bch4 - Generate 7 bytes of ECC bytes |
| 1133 | * @mtd: MTD device structure |
| 1134 | * @dat: The pointer to data on which ecc is computed |
| 1135 | * @ecc_code: The ecc_code buffer |
| 1136 | */ |
| 1137 | static int omap3_calculate_ecc_bch4(struct mtd_info *mtd, const u_char *dat, |
| 1138 | u_char *ecc_code) |
| 1139 | { |
| 1140 | struct omap_nand_info *info = container_of(mtd, struct omap_nand_info, |
| 1141 | mtd); |
Afzal Mohammed | 2ef9f3d | 2012-10-04 19:03:06 +0530 | [diff] [blame] | 1142 | unsigned long nsectors, val1, val2; |
| 1143 | int i; |
| 1144 | |
| 1145 | nsectors = ((readl(info->reg.gpmc_ecc_config) >> 4) & 0x7) + 1; |
| 1146 | |
| 1147 | for (i = 0; i < nsectors; i++) { |
| 1148 | |
| 1149 | /* Read hw-computed remainder */ |
| 1150 | val1 = readl(info->reg.gpmc_bch_result0[i]); |
| 1151 | val2 = readl(info->reg.gpmc_bch_result1[i]); |
| 1152 | |
| 1153 | /* |
| 1154 | * Add constant polynomial to remainder, in order to get an ecc |
| 1155 | * sequence of 0xFFs for a buffer filled with 0xFFs; and |
| 1156 | * left-justify the resulting polynomial. |
| 1157 | */ |
| 1158 | *ecc_code++ = 0x28 ^ ((val2 >> 12) & 0xFF); |
| 1159 | *ecc_code++ = 0x13 ^ ((val2 >> 4) & 0xFF); |
| 1160 | *ecc_code++ = 0xcc ^ (((val2 & 0xF) << 4)|((val1 >> 28) & 0xF)); |
| 1161 | *ecc_code++ = 0x39 ^ ((val1 >> 20) & 0xFF); |
| 1162 | *ecc_code++ = 0x96 ^ ((val1 >> 12) & 0xFF); |
| 1163 | *ecc_code++ = 0xac ^ ((val1 >> 4) & 0xFF); |
| 1164 | *ecc_code++ = 0x7f ^ ((val1 & 0xF) << 4); |
| 1165 | } |
| 1166 | |
| 1167 | return 0; |
Ivan Djelic | 0e618ef | 2012-04-30 12:17:18 +0200 | [diff] [blame] | 1168 | } |
| 1169 | |
| 1170 | /** |
| 1171 | * omap3_calculate_ecc_bch8 - Generate 13 bytes of ECC bytes |
| 1172 | * @mtd: MTD device structure |
| 1173 | * @dat: The pointer to data on which ecc is computed |
| 1174 | * @ecc_code: The ecc_code buffer |
| 1175 | */ |
| 1176 | static int omap3_calculate_ecc_bch8(struct mtd_info *mtd, const u_char *dat, |
| 1177 | u_char *ecc_code) |
| 1178 | { |
| 1179 | struct omap_nand_info *info = container_of(mtd, struct omap_nand_info, |
| 1180 | mtd); |
Afzal Mohammed | 2ef9f3d | 2012-10-04 19:03:06 +0530 | [diff] [blame] | 1181 | unsigned long nsectors, val1, val2, val3, val4; |
| 1182 | int i; |
| 1183 | |
| 1184 | nsectors = ((readl(info->reg.gpmc_ecc_config) >> 4) & 0x7) + 1; |
| 1185 | |
| 1186 | for (i = 0; i < nsectors; i++) { |
| 1187 | |
| 1188 | /* Read hw-computed remainder */ |
| 1189 | val1 = readl(info->reg.gpmc_bch_result0[i]); |
| 1190 | val2 = readl(info->reg.gpmc_bch_result1[i]); |
| 1191 | val3 = readl(info->reg.gpmc_bch_result2[i]); |
| 1192 | val4 = readl(info->reg.gpmc_bch_result3[i]); |
| 1193 | |
| 1194 | /* |
| 1195 | * Add constant polynomial to remainder, in order to get an ecc |
| 1196 | * sequence of 0xFFs for a buffer filled with 0xFFs. |
| 1197 | */ |
| 1198 | *ecc_code++ = 0xef ^ (val4 & 0xFF); |
| 1199 | *ecc_code++ = 0x51 ^ ((val3 >> 24) & 0xFF); |
| 1200 | *ecc_code++ = 0x2e ^ ((val3 >> 16) & 0xFF); |
| 1201 | *ecc_code++ = 0x09 ^ ((val3 >> 8) & 0xFF); |
| 1202 | *ecc_code++ = 0xed ^ (val3 & 0xFF); |
| 1203 | *ecc_code++ = 0x93 ^ ((val2 >> 24) & 0xFF); |
| 1204 | *ecc_code++ = 0x9a ^ ((val2 >> 16) & 0xFF); |
| 1205 | *ecc_code++ = 0xc2 ^ ((val2 >> 8) & 0xFF); |
| 1206 | *ecc_code++ = 0x97 ^ (val2 & 0xFF); |
| 1207 | *ecc_code++ = 0x79 ^ ((val1 >> 24) & 0xFF); |
| 1208 | *ecc_code++ = 0xe5 ^ ((val1 >> 16) & 0xFF); |
| 1209 | *ecc_code++ = 0x24 ^ ((val1 >> 8) & 0xFF); |
| 1210 | *ecc_code++ = 0xb5 ^ (val1 & 0xFF); |
| 1211 | } |
| 1212 | |
| 1213 | return 0; |
Ivan Djelic | 0e618ef | 2012-04-30 12:17:18 +0200 | [diff] [blame] | 1214 | } |
Pekon Gupta | a919e51 | 2013-10-24 18:20:21 +0530 | [diff] [blame] | 1215 | #endif /* CONFIG_MTD_NAND_ECC_BCH */ |
Ivan Djelic | 0e618ef | 2012-04-30 12:17:18 +0200 | [diff] [blame] | 1216 | |
Pekon Gupta | a919e51 | 2013-10-24 18:20:21 +0530 | [diff] [blame] | 1217 | #ifdef CONFIG_MTD_NAND_OMAP_BCH |
Ivan Djelic | 0e618ef | 2012-04-30 12:17:18 +0200 | [diff] [blame] | 1218 | /** |
Philip Avinash | 62116e5 | 2013-01-04 13:26:51 +0530 | [diff] [blame] | 1219 | * omap3_calculate_ecc_bch - Generate bytes of ECC bytes |
| 1220 | * @mtd: MTD device structure |
| 1221 | * @dat: The pointer to data on which ecc is computed |
| 1222 | * @ecc_code: The ecc_code buffer |
| 1223 | * |
| 1224 | * Support calculating of BCH4/8 ecc vectors for the page |
| 1225 | */ |
| 1226 | static int omap3_calculate_ecc_bch(struct mtd_info *mtd, const u_char *dat, |
| 1227 | u_char *ecc_code) |
| 1228 | { |
| 1229 | struct omap_nand_info *info = container_of(mtd, struct omap_nand_info, |
| 1230 | mtd); |
| 1231 | unsigned long nsectors, bch_val1, bch_val2, bch_val3, bch_val4; |
| 1232 | int i, eccbchtsel; |
| 1233 | |
| 1234 | nsectors = ((readl(info->reg.gpmc_ecc_config) >> 4) & 0x7) + 1; |
| 1235 | /* |
| 1236 | * find BCH scheme used |
| 1237 | * 0 -> BCH4 |
| 1238 | * 1 -> BCH8 |
| 1239 | */ |
| 1240 | eccbchtsel = ((readl(info->reg.gpmc_ecc_config) >> 12) & 0x3); |
| 1241 | |
| 1242 | for (i = 0; i < nsectors; i++) { |
| 1243 | |
| 1244 | /* Read hw-computed remainder */ |
| 1245 | bch_val1 = readl(info->reg.gpmc_bch_result0[i]); |
| 1246 | bch_val2 = readl(info->reg.gpmc_bch_result1[i]); |
| 1247 | if (eccbchtsel) { |
| 1248 | bch_val3 = readl(info->reg.gpmc_bch_result2[i]); |
| 1249 | bch_val4 = readl(info->reg.gpmc_bch_result3[i]); |
| 1250 | } |
| 1251 | |
| 1252 | if (eccbchtsel) { |
| 1253 | /* BCH8 ecc scheme */ |
| 1254 | *ecc_code++ = (bch_val4 & 0xFF); |
| 1255 | *ecc_code++ = ((bch_val3 >> 24) & 0xFF); |
| 1256 | *ecc_code++ = ((bch_val3 >> 16) & 0xFF); |
| 1257 | *ecc_code++ = ((bch_val3 >> 8) & 0xFF); |
| 1258 | *ecc_code++ = (bch_val3 & 0xFF); |
| 1259 | *ecc_code++ = ((bch_val2 >> 24) & 0xFF); |
| 1260 | *ecc_code++ = ((bch_val2 >> 16) & 0xFF); |
| 1261 | *ecc_code++ = ((bch_val2 >> 8) & 0xFF); |
| 1262 | *ecc_code++ = (bch_val2 & 0xFF); |
| 1263 | *ecc_code++ = ((bch_val1 >> 24) & 0xFF); |
| 1264 | *ecc_code++ = ((bch_val1 >> 16) & 0xFF); |
| 1265 | *ecc_code++ = ((bch_val1 >> 8) & 0xFF); |
| 1266 | *ecc_code++ = (bch_val1 & 0xFF); |
| 1267 | /* |
| 1268 | * Setting 14th byte to zero to handle |
| 1269 | * erased page & maintain compatibility |
| 1270 | * with RBL |
| 1271 | */ |
| 1272 | *ecc_code++ = 0x0; |
| 1273 | } else { |
| 1274 | /* BCH4 ecc scheme */ |
| 1275 | *ecc_code++ = ((bch_val2 >> 12) & 0xFF); |
| 1276 | *ecc_code++ = ((bch_val2 >> 4) & 0xFF); |
| 1277 | *ecc_code++ = ((bch_val2 & 0xF) << 4) | |
| 1278 | ((bch_val1 >> 28) & 0xF); |
| 1279 | *ecc_code++ = ((bch_val1 >> 20) & 0xFF); |
| 1280 | *ecc_code++ = ((bch_val1 >> 12) & 0xFF); |
| 1281 | *ecc_code++ = ((bch_val1 >> 4) & 0xFF); |
| 1282 | *ecc_code++ = ((bch_val1 & 0xF) << 4); |
| 1283 | /* |
| 1284 | * Setting 8th byte to zero to handle |
| 1285 | * erased page |
| 1286 | */ |
| 1287 | *ecc_code++ = 0x0; |
| 1288 | } |
| 1289 | } |
| 1290 | |
| 1291 | return 0; |
| 1292 | } |
| 1293 | |
| 1294 | /** |
| 1295 | * erased_sector_bitflips - count bit flips |
| 1296 | * @data: data sector buffer |
| 1297 | * @oob: oob buffer |
| 1298 | * @info: omap_nand_info |
| 1299 | * |
| 1300 | * Check the bit flips in erased page falls below correctable level. |
| 1301 | * If falls below, report the page as erased with correctable bit |
| 1302 | * flip, else report as uncorrectable page. |
| 1303 | */ |
| 1304 | static int erased_sector_bitflips(u_char *data, u_char *oob, |
| 1305 | struct omap_nand_info *info) |
| 1306 | { |
| 1307 | int flip_bits = 0, i; |
| 1308 | |
| 1309 | for (i = 0; i < info->nand.ecc.size; i++) { |
| 1310 | flip_bits += hweight8(~data[i]); |
| 1311 | if (flip_bits > info->nand.ecc.strength) |
| 1312 | return 0; |
| 1313 | } |
| 1314 | |
| 1315 | for (i = 0; i < info->nand.ecc.bytes - 1; i++) { |
| 1316 | flip_bits += hweight8(~oob[i]); |
| 1317 | if (flip_bits > info->nand.ecc.strength) |
| 1318 | return 0; |
| 1319 | } |
| 1320 | |
| 1321 | /* |
| 1322 | * Bit flips falls in correctable level. |
| 1323 | * Fill data area with 0xFF |
| 1324 | */ |
| 1325 | if (flip_bits) { |
| 1326 | memset(data, 0xFF, info->nand.ecc.size); |
| 1327 | memset(oob, 0xFF, info->nand.ecc.bytes); |
| 1328 | } |
| 1329 | |
| 1330 | return flip_bits; |
| 1331 | } |
| 1332 | |
| 1333 | /** |
| 1334 | * omap_elm_correct_data - corrects page data area in case error reported |
| 1335 | * @mtd: MTD device structure |
| 1336 | * @data: page data |
| 1337 | * @read_ecc: ecc read from nand flash |
| 1338 | * @calc_ecc: ecc read from HW ECC registers |
| 1339 | * |
| 1340 | * Calculated ecc vector reported as zero in case of non-error pages. |
| 1341 | * In case of error/erased pages non-zero error vector is reported. |
| 1342 | * In case of non-zero ecc vector, check read_ecc at fixed offset |
| 1343 | * (x = 13/7 in case of BCH8/4 == 0) to find page programmed or not. |
| 1344 | * To handle bit flips in this data, count the number of 0's in |
| 1345 | * read_ecc[x] and check if it greater than 4. If it is less, it is |
| 1346 | * programmed page, else erased page. |
| 1347 | * |
| 1348 | * 1. If page is erased, check with standard ecc vector (ecc vector |
| 1349 | * for erased page to find any bit flip). If check fails, bit flip |
| 1350 | * is present in erased page. Count the bit flips in erased page and |
| 1351 | * if it falls under correctable level, report page with 0xFF and |
| 1352 | * update the correctable bit information. |
| 1353 | * 2. If error is reported on programmed page, update elm error |
| 1354 | * vector and correct the page with ELM error correction routine. |
| 1355 | * |
| 1356 | */ |
| 1357 | static int omap_elm_correct_data(struct mtd_info *mtd, u_char *data, |
| 1358 | u_char *read_ecc, u_char *calc_ecc) |
| 1359 | { |
| 1360 | struct omap_nand_info *info = container_of(mtd, struct omap_nand_info, |
| 1361 | mtd); |
Pekon Gupta | de0a4d6 | 2014-03-18 18:56:43 +0530 | [diff] [blame^] | 1362 | struct nand_ecc_ctrl *ecc = &info->nand.ecc; |
Philip Avinash | 62116e5 | 2013-01-04 13:26:51 +0530 | [diff] [blame] | 1363 | int eccsteps = info->nand.ecc.steps; |
| 1364 | int i , j, stat = 0; |
Pekon Gupta | de0a4d6 | 2014-03-18 18:56:43 +0530 | [diff] [blame^] | 1365 | int eccflag, actual_eccbytes; |
Philip Avinash | 62116e5 | 2013-01-04 13:26:51 +0530 | [diff] [blame] | 1366 | struct elm_errorvec err_vec[ERROR_VECTOR_MAX]; |
| 1367 | u_char *ecc_vec = calc_ecc; |
| 1368 | u_char *spare_ecc = read_ecc; |
| 1369 | u_char *erased_ecc_vec; |
| 1370 | enum bch_ecc type; |
| 1371 | bool is_error_reported = false; |
| 1372 | |
Pekon Gupta | de0a4d6 | 2014-03-18 18:56:43 +0530 | [diff] [blame^] | 1373 | switch (info->ecc_opt) { |
| 1374 | case OMAP_ECC_BCH4_CODE_HW: |
| 1375 | /* omit 7th ECC byte reserved for ROM code compatibility */ |
| 1376 | actual_eccbytes = ecc->bytes - 1; |
| 1377 | break; |
| 1378 | case OMAP_ECC_BCH8_CODE_HW: |
| 1379 | /* omit 14th ECC byte reserved for ROM code compatibility */ |
| 1380 | actual_eccbytes = ecc->bytes - 1; |
| 1381 | break; |
| 1382 | default: |
| 1383 | pr_err("invalid driver configuration\n"); |
| 1384 | return -EINVAL; |
| 1385 | } |
| 1386 | |
Philip Avinash | 62116e5 | 2013-01-04 13:26:51 +0530 | [diff] [blame] | 1387 | /* Initialize elm error vector to zero */ |
| 1388 | memset(err_vec, 0, sizeof(err_vec)); |
| 1389 | |
| 1390 | if (info->nand.ecc.strength == BCH8_MAX_ERROR) { |
| 1391 | type = BCH8_ECC; |
| 1392 | erased_ecc_vec = bch8_vector; |
| 1393 | } else { |
| 1394 | type = BCH4_ECC; |
| 1395 | erased_ecc_vec = bch4_vector; |
| 1396 | } |
| 1397 | |
Philip Avinash | 62116e5 | 2013-01-04 13:26:51 +0530 | [diff] [blame] | 1398 | for (i = 0; i < eccsteps ; i++) { |
| 1399 | eccflag = 0; /* initialize eccflag */ |
| 1400 | |
| 1401 | /* |
| 1402 | * Check any error reported, |
| 1403 | * In case of error, non zero ecc reported. |
| 1404 | */ |
Pekon Gupta | de0a4d6 | 2014-03-18 18:56:43 +0530 | [diff] [blame^] | 1405 | for (j = 0; j < actual_eccbytes; j++) { |
Philip Avinash | 62116e5 | 2013-01-04 13:26:51 +0530 | [diff] [blame] | 1406 | if (calc_ecc[j] != 0) { |
| 1407 | eccflag = 1; /* non zero ecc, error present */ |
| 1408 | break; |
| 1409 | } |
| 1410 | } |
| 1411 | |
| 1412 | if (eccflag == 1) { |
| 1413 | /* |
| 1414 | * Set threshold to minimum of 4, half of ecc.strength/2 |
| 1415 | * to allow max bit flip in byte to 4 |
| 1416 | */ |
| 1417 | unsigned int threshold = min_t(unsigned int, 4, |
| 1418 | info->nand.ecc.strength / 2); |
| 1419 | |
| 1420 | /* |
| 1421 | * Check data area is programmed by counting |
| 1422 | * number of 0's at fixed offset in spare area. |
| 1423 | * Checking count of 0's against threshold. |
| 1424 | * In case programmed page expects at least threshold |
| 1425 | * zeros in byte. |
| 1426 | * If zeros are less than threshold for programmed page/ |
| 1427 | * zeros are more than threshold erased page, either |
| 1428 | * case page reported as uncorrectable. |
| 1429 | */ |
Pekon Gupta | de0a4d6 | 2014-03-18 18:56:43 +0530 | [diff] [blame^] | 1430 | if (hweight8(~read_ecc[actual_eccbytes]) >= threshold) { |
Philip Avinash | 62116e5 | 2013-01-04 13:26:51 +0530 | [diff] [blame] | 1431 | /* |
| 1432 | * Update elm error vector as |
| 1433 | * data area is programmed |
| 1434 | */ |
| 1435 | err_vec[i].error_reported = true; |
| 1436 | is_error_reported = true; |
| 1437 | } else { |
| 1438 | /* Error reported in erased page */ |
| 1439 | int bitflip_count; |
| 1440 | u_char *buf = &data[info->nand.ecc.size * i]; |
| 1441 | |
Pekon Gupta | de0a4d6 | 2014-03-18 18:56:43 +0530 | [diff] [blame^] | 1442 | if (memcmp(calc_ecc, erased_ecc_vec, |
| 1443 | actual_eccbytes)) { |
Philip Avinash | 62116e5 | 2013-01-04 13:26:51 +0530 | [diff] [blame] | 1444 | bitflip_count = erased_sector_bitflips( |
| 1445 | buf, read_ecc, info); |
| 1446 | |
| 1447 | if (bitflip_count) |
| 1448 | stat += bitflip_count; |
| 1449 | else |
| 1450 | return -EINVAL; |
| 1451 | } |
| 1452 | } |
| 1453 | } |
| 1454 | |
| 1455 | /* Update the ecc vector */ |
Pekon Gupta | de0a4d6 | 2014-03-18 18:56:43 +0530 | [diff] [blame^] | 1456 | calc_ecc += ecc->bytes; |
| 1457 | read_ecc += ecc->bytes; |
Philip Avinash | 62116e5 | 2013-01-04 13:26:51 +0530 | [diff] [blame] | 1458 | } |
| 1459 | |
| 1460 | /* Check if any error reported */ |
| 1461 | if (!is_error_reported) |
| 1462 | return 0; |
| 1463 | |
| 1464 | /* Decode BCH error using ELM module */ |
| 1465 | elm_decode_bch_error_page(info->elm_dev, ecc_vec, err_vec); |
| 1466 | |
| 1467 | for (i = 0; i < eccsteps; i++) { |
| 1468 | if (err_vec[i].error_reported) { |
| 1469 | for (j = 0; j < err_vec[i].error_count; j++) { |
| 1470 | u32 bit_pos, byte_pos, error_max, pos; |
| 1471 | |
| 1472 | if (type == BCH8_ECC) |
| 1473 | error_max = BCH8_ECC_MAX; |
| 1474 | else |
| 1475 | error_max = BCH4_ECC_MAX; |
| 1476 | |
| 1477 | if (info->nand.ecc.strength == BCH8_MAX_ERROR) |
| 1478 | pos = err_vec[i].error_loc[j]; |
| 1479 | else |
| 1480 | /* Add 4 to take care 4 bit padding */ |
| 1481 | pos = err_vec[i].error_loc[j] + |
| 1482 | BCH4_BIT_PAD; |
| 1483 | |
| 1484 | /* Calculate bit position of error */ |
| 1485 | bit_pos = pos % 8; |
| 1486 | |
| 1487 | /* Calculate byte position of error */ |
| 1488 | byte_pos = (error_max - pos - 1) / 8; |
| 1489 | |
| 1490 | if (pos < error_max) { |
| 1491 | if (byte_pos < 512) |
| 1492 | data[byte_pos] ^= 1 << bit_pos; |
| 1493 | else |
| 1494 | spare_ecc[byte_pos - 512] ^= |
| 1495 | 1 << bit_pos; |
| 1496 | } |
| 1497 | /* else, not interested to correct ecc */ |
| 1498 | } |
| 1499 | } |
| 1500 | |
| 1501 | /* Update number of correctable errors */ |
| 1502 | stat += err_vec[i].error_count; |
| 1503 | |
| 1504 | /* Update page data with sector size */ |
| 1505 | data += info->nand.ecc.size; |
Pekon Gupta | de0a4d6 | 2014-03-18 18:56:43 +0530 | [diff] [blame^] | 1506 | spare_ecc += ecc->bytes; |
Philip Avinash | 62116e5 | 2013-01-04 13:26:51 +0530 | [diff] [blame] | 1507 | } |
| 1508 | |
| 1509 | for (i = 0; i < eccsteps; i++) |
| 1510 | /* Return error if uncorrectable error present */ |
| 1511 | if (err_vec[i].error_uncorrectable) |
| 1512 | return -EINVAL; |
| 1513 | |
| 1514 | return stat; |
| 1515 | } |
| 1516 | |
Ivan Djelic | 0e618ef | 2012-04-30 12:17:18 +0200 | [diff] [blame] | 1517 | /** |
Philip Avinash | 62116e5 | 2013-01-04 13:26:51 +0530 | [diff] [blame] | 1518 | * omap_write_page_bch - BCH ecc based write page function for entire page |
| 1519 | * @mtd: mtd info structure |
| 1520 | * @chip: nand chip info structure |
| 1521 | * @buf: data buffer |
| 1522 | * @oob_required: must write chip->oob_poi to OOB |
| 1523 | * |
| 1524 | * Custom write page method evolved to support multi sector writing in one shot |
| 1525 | */ |
| 1526 | static int omap_write_page_bch(struct mtd_info *mtd, struct nand_chip *chip, |
| 1527 | const uint8_t *buf, int oob_required) |
| 1528 | { |
| 1529 | int i; |
| 1530 | uint8_t *ecc_calc = chip->buffers->ecccalc; |
| 1531 | uint32_t *eccpos = chip->ecc.layout->eccpos; |
| 1532 | |
| 1533 | /* Enable GPMC ecc engine */ |
| 1534 | chip->ecc.hwctl(mtd, NAND_ECC_WRITE); |
| 1535 | |
| 1536 | /* Write data */ |
| 1537 | chip->write_buf(mtd, buf, mtd->writesize); |
| 1538 | |
| 1539 | /* Update ecc vector from GPMC result registers */ |
| 1540 | chip->ecc.calculate(mtd, buf, &ecc_calc[0]); |
| 1541 | |
| 1542 | for (i = 0; i < chip->ecc.total; i++) |
| 1543 | chip->oob_poi[eccpos[i]] = ecc_calc[i]; |
| 1544 | |
| 1545 | /* Write ecc vector to OOB area */ |
| 1546 | chip->write_buf(mtd, chip->oob_poi, mtd->oobsize); |
| 1547 | return 0; |
| 1548 | } |
| 1549 | |
| 1550 | /** |
| 1551 | * omap_read_page_bch - BCH ecc based page read function for entire page |
| 1552 | * @mtd: mtd info structure |
| 1553 | * @chip: nand chip info structure |
| 1554 | * @buf: buffer to store read data |
| 1555 | * @oob_required: caller requires OOB data read to chip->oob_poi |
| 1556 | * @page: page number to read |
| 1557 | * |
| 1558 | * For BCH ecc scheme, GPMC used for syndrome calculation and ELM module |
| 1559 | * used for error correction. |
| 1560 | * Custom method evolved to support ELM error correction & multi sector |
| 1561 | * reading. On reading page data area is read along with OOB data with |
| 1562 | * ecc engine enabled. ecc vector updated after read of OOB data. |
| 1563 | * For non error pages ecc vector reported as zero. |
| 1564 | */ |
| 1565 | static int omap_read_page_bch(struct mtd_info *mtd, struct nand_chip *chip, |
| 1566 | uint8_t *buf, int oob_required, int page) |
| 1567 | { |
| 1568 | uint8_t *ecc_calc = chip->buffers->ecccalc; |
| 1569 | uint8_t *ecc_code = chip->buffers->ecccode; |
| 1570 | uint32_t *eccpos = chip->ecc.layout->eccpos; |
| 1571 | uint8_t *oob = &chip->oob_poi[eccpos[0]]; |
| 1572 | uint32_t oob_pos = mtd->writesize + chip->ecc.layout->eccpos[0]; |
| 1573 | int stat; |
| 1574 | unsigned int max_bitflips = 0; |
| 1575 | |
| 1576 | /* Enable GPMC ecc engine */ |
| 1577 | chip->ecc.hwctl(mtd, NAND_ECC_READ); |
| 1578 | |
| 1579 | /* Read data */ |
| 1580 | chip->read_buf(mtd, buf, mtd->writesize); |
| 1581 | |
| 1582 | /* Read oob bytes */ |
| 1583 | chip->cmdfunc(mtd, NAND_CMD_RNDOUT, oob_pos, -1); |
| 1584 | chip->read_buf(mtd, oob, chip->ecc.total); |
| 1585 | |
| 1586 | /* Calculate ecc bytes */ |
| 1587 | chip->ecc.calculate(mtd, buf, ecc_calc); |
| 1588 | |
| 1589 | memcpy(ecc_code, &chip->oob_poi[eccpos[0]], chip->ecc.total); |
| 1590 | |
| 1591 | stat = chip->ecc.correct(mtd, buf, ecc_code, ecc_calc); |
| 1592 | |
| 1593 | if (stat < 0) { |
| 1594 | mtd->ecc_stats.failed++; |
| 1595 | } else { |
| 1596 | mtd->ecc_stats.corrected += stat; |
| 1597 | max_bitflips = max_t(unsigned int, max_bitflips, stat); |
| 1598 | } |
| 1599 | |
| 1600 | return max_bitflips; |
| 1601 | } |
| 1602 | |
| 1603 | /** |
Pekon Gupta | a919e51 | 2013-10-24 18:20:21 +0530 | [diff] [blame] | 1604 | * is_elm_present - checks for presence of ELM module by scanning DT nodes |
| 1605 | * @omap_nand_info: NAND device structure containing platform data |
| 1606 | * @bch_type: 0x0=BCH4, 0x1=BCH8, 0x2=BCH16 |
| 1607 | */ |
| 1608 | static int is_elm_present(struct omap_nand_info *info, |
| 1609 | struct device_node *elm_node, enum bch_ecc bch_type) |
| 1610 | { |
| 1611 | struct platform_device *pdev; |
| 1612 | info->is_elm_used = false; |
| 1613 | /* check whether elm-id is passed via DT */ |
| 1614 | if (!elm_node) { |
| 1615 | pr_err("nand: error: ELM DT node not found\n"); |
| 1616 | return -ENODEV; |
| 1617 | } |
| 1618 | pdev = of_find_device_by_node(elm_node); |
| 1619 | /* check whether ELM device is registered */ |
| 1620 | if (!pdev) { |
| 1621 | pr_err("nand: error: ELM device not found\n"); |
| 1622 | return -ENODEV; |
| 1623 | } |
| 1624 | /* ELM module available, now configure it */ |
| 1625 | info->elm_dev = &pdev->dev; |
| 1626 | if (elm_config(info->elm_dev, bch_type)) |
| 1627 | return -ENODEV; |
| 1628 | info->is_elm_used = true; |
| 1629 | return 0; |
| 1630 | } |
| 1631 | #endif /* CONFIG_MTD_NAND_ECC_BCH */ |
| 1632 | |
Bill Pemberton | 06f2551 | 2012-11-19 13:23:07 -0500 | [diff] [blame] | 1633 | static int omap_nand_probe(struct platform_device *pdev) |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 1634 | { |
| 1635 | struct omap_nand_info *info; |
| 1636 | struct omap_nand_platform_data *pdata; |
Pekon Gupta | 633deb5 | 2013-10-24 18:20:19 +0530 | [diff] [blame] | 1637 | struct mtd_info *mtd; |
| 1638 | struct nand_chip *nand_chip; |
Pekon Gupta | b491da7 | 2013-10-24 18:20:22 +0530 | [diff] [blame] | 1639 | struct nand_ecclayout *ecclayout; |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 1640 | int err; |
Pekon Gupta | b491da7 | 2013-10-24 18:20:22 +0530 | [diff] [blame] | 1641 | int i; |
Pekon Gupta | 633deb5 | 2013-10-24 18:20:19 +0530 | [diff] [blame] | 1642 | dma_cap_mask_t mask; |
| 1643 | unsigned sig; |
Pekon Gupta | eae39cb | 2014-02-17 13:11:23 +0530 | [diff] [blame] | 1644 | unsigned oob_index; |
Afzal Mohammed | 9c4c2f8 | 2012-08-30 12:53:23 -0700 | [diff] [blame] | 1645 | struct resource *res; |
Daniel Mack | ccf04c5 | 2012-12-14 11:36:41 +0100 | [diff] [blame] | 1646 | struct mtd_part_parser_data ppdata = {}; |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 1647 | |
Jingoo Han | 453810b | 2013-07-30 17:18:33 +0900 | [diff] [blame] | 1648 | pdata = dev_get_platdata(&pdev->dev); |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 1649 | if (pdata == NULL) { |
| 1650 | dev_err(&pdev->dev, "platform data missing\n"); |
| 1651 | return -ENODEV; |
| 1652 | } |
| 1653 | |
Pekon Gupta | 70ba6d7 | 2013-10-24 18:20:25 +0530 | [diff] [blame] | 1654 | info = devm_kzalloc(&pdev->dev, sizeof(struct omap_nand_info), |
| 1655 | GFP_KERNEL); |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 1656 | if (!info) |
| 1657 | return -ENOMEM; |
| 1658 | |
| 1659 | platform_set_drvdata(pdev, info); |
| 1660 | |
| 1661 | spin_lock_init(&info->controller.lock); |
| 1662 | init_waitqueue_head(&info->controller.wq); |
| 1663 | |
Pekon Gupta | 633deb5 | 2013-10-24 18:20:19 +0530 | [diff] [blame] | 1664 | info->pdev = pdev; |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 1665 | info->gpmc_cs = pdata->cs; |
Afzal Mohammed | 65b97cf | 2012-08-30 12:53:22 -0700 | [diff] [blame] | 1666 | info->reg = pdata->reg; |
Pekon Gupta | a919e51 | 2013-10-24 18:20:21 +0530 | [diff] [blame] | 1667 | info->of_node = pdata->of_node; |
Pekon Gupta | 4e55807 | 2014-03-18 18:56:42 +0530 | [diff] [blame] | 1668 | info->ecc_opt = pdata->ecc_opt; |
Pekon Gupta | 633deb5 | 2013-10-24 18:20:19 +0530 | [diff] [blame] | 1669 | mtd = &info->mtd; |
| 1670 | mtd->priv = &info->nand; |
| 1671 | mtd->name = dev_name(&pdev->dev); |
| 1672 | mtd->owner = THIS_MODULE; |
| 1673 | nand_chip = &info->nand; |
Pekon Gupta | 32d42a8 | 2013-10-24 18:20:23 +0530 | [diff] [blame] | 1674 | nand_chip->ecc.priv = NULL; |
Pekon Gupta | 633deb5 | 2013-10-24 18:20:19 +0530 | [diff] [blame] | 1675 | nand_chip->options |= NAND_SKIP_BBTSCAN; |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 1676 | |
Afzal Mohammed | 9c4c2f8 | 2012-08-30 12:53:23 -0700 | [diff] [blame] | 1677 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 1678 | if (res == NULL) { |
| 1679 | err = -EINVAL; |
| 1680 | dev_err(&pdev->dev, "error getting memory resource\n"); |
Pekon Gupta | 70ba6d7 | 2013-10-24 18:20:25 +0530 | [diff] [blame] | 1681 | goto return_error; |
Afzal Mohammed | 9c4c2f8 | 2012-08-30 12:53:23 -0700 | [diff] [blame] | 1682 | } |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 1683 | |
Afzal Mohammed | 9c4c2f8 | 2012-08-30 12:53:23 -0700 | [diff] [blame] | 1684 | info->phys_base = res->start; |
| 1685 | info->mem_size = resource_size(res); |
| 1686 | |
Pekon Gupta | 70ba6d7 | 2013-10-24 18:20:25 +0530 | [diff] [blame] | 1687 | if (!devm_request_mem_region(&pdev->dev, info->phys_base, |
| 1688 | info->mem_size, pdev->dev.driver->name)) { |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 1689 | err = -EBUSY; |
Pekon Gupta | 70ba6d7 | 2013-10-24 18:20:25 +0530 | [diff] [blame] | 1690 | goto return_error; |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 1691 | } |
| 1692 | |
Pekon Gupta | 70ba6d7 | 2013-10-24 18:20:25 +0530 | [diff] [blame] | 1693 | nand_chip->IO_ADDR_R = devm_ioremap(&pdev->dev, info->phys_base, |
| 1694 | info->mem_size); |
Pekon Gupta | 633deb5 | 2013-10-24 18:20:19 +0530 | [diff] [blame] | 1695 | if (!nand_chip->IO_ADDR_R) { |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 1696 | err = -ENOMEM; |
Pekon Gupta | 70ba6d7 | 2013-10-24 18:20:25 +0530 | [diff] [blame] | 1697 | goto return_error; |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 1698 | } |
vimal singh | 59e9c5a | 2009-07-13 16:26:24 +0530 | [diff] [blame] | 1699 | |
Pekon Gupta | 633deb5 | 2013-10-24 18:20:19 +0530 | [diff] [blame] | 1700 | nand_chip->controller = &info->controller; |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 1701 | |
Pekon Gupta | 633deb5 | 2013-10-24 18:20:19 +0530 | [diff] [blame] | 1702 | nand_chip->IO_ADDR_W = nand_chip->IO_ADDR_R; |
| 1703 | nand_chip->cmd_ctrl = omap_hwcontrol; |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 1704 | |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 1705 | /* |
| 1706 | * If RDY/BSY line is connected to OMAP then use the omap ready |
Peter Meerwald | 4cacbe2 | 2012-07-19 13:21:04 +0200 | [diff] [blame] | 1707 | * function and the generic nand_wait function which reads the status |
| 1708 | * register after monitoring the RDY/BSY line. Otherwise use a standard |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 1709 | * chip delay which is slightly more than tR (AC Timing) of the NAND |
| 1710 | * device and read status register until you get a failure or success |
| 1711 | */ |
| 1712 | if (pdata->dev_ready) { |
Pekon Gupta | 633deb5 | 2013-10-24 18:20:19 +0530 | [diff] [blame] | 1713 | nand_chip->dev_ready = omap_dev_ready; |
| 1714 | nand_chip->chip_delay = 0; |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 1715 | } else { |
Pekon Gupta | 633deb5 | 2013-10-24 18:20:19 +0530 | [diff] [blame] | 1716 | nand_chip->waitfunc = omap_wait; |
| 1717 | nand_chip->chip_delay = 50; |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 1718 | } |
| 1719 | |
Pekon Gupta | f18befb | 2013-10-24 18:20:20 +0530 | [diff] [blame] | 1720 | /* scan NAND device connected to chip controller */ |
| 1721 | nand_chip->options |= pdata->devsize & NAND_BUSWIDTH_16; |
| 1722 | if (nand_scan_ident(mtd, 1, NULL)) { |
| 1723 | pr_err("nand device scan failed, may be bus-width mismatch\n"); |
| 1724 | err = -ENXIO; |
Pekon Gupta | 70ba6d7 | 2013-10-24 18:20:25 +0530 | [diff] [blame] | 1725 | goto return_error; |
Pekon Gupta | f18befb | 2013-10-24 18:20:20 +0530 | [diff] [blame] | 1726 | } |
| 1727 | |
Pekon Gupta | b491da7 | 2013-10-24 18:20:22 +0530 | [diff] [blame] | 1728 | /* check for small page devices */ |
| 1729 | if ((mtd->oobsize < 64) && (pdata->ecc_opt != OMAP_ECC_HAM1_CODE_HW)) { |
| 1730 | pr_err("small page devices are not supported\n"); |
| 1731 | err = -EINVAL; |
Pekon Gupta | 70ba6d7 | 2013-10-24 18:20:25 +0530 | [diff] [blame] | 1732 | goto return_error; |
Pekon Gupta | b491da7 | 2013-10-24 18:20:22 +0530 | [diff] [blame] | 1733 | } |
| 1734 | |
Pekon Gupta | f18befb | 2013-10-24 18:20:20 +0530 | [diff] [blame] | 1735 | /* re-populate low-level callbacks based on xfer modes */ |
Sukumar Ghorai | 1b0b323c | 2011-01-28 15:42:04 +0530 | [diff] [blame] | 1736 | switch (pdata->xfer_type) { |
| 1737 | case NAND_OMAP_PREFETCH_POLLED: |
Pekon Gupta | 633deb5 | 2013-10-24 18:20:19 +0530 | [diff] [blame] | 1738 | nand_chip->read_buf = omap_read_buf_pref; |
| 1739 | nand_chip->write_buf = omap_write_buf_pref; |
Sukumar Ghorai | 1b0b323c | 2011-01-28 15:42:04 +0530 | [diff] [blame] | 1740 | break; |
vimal singh | dfe3289 | 2009-07-13 16:29:16 +0530 | [diff] [blame] | 1741 | |
Sukumar Ghorai | 1b0b323c | 2011-01-28 15:42:04 +0530 | [diff] [blame] | 1742 | case NAND_OMAP_POLLED: |
Brian Norris | cf0e4d2 | 2013-10-30 19:39:51 -0400 | [diff] [blame] | 1743 | /* Use nand_base defaults for {read,write}_buf */ |
Sukumar Ghorai | 1b0b323c | 2011-01-28 15:42:04 +0530 | [diff] [blame] | 1744 | break; |
| 1745 | |
| 1746 | case NAND_OMAP_PREFETCH_DMA: |
Russell King | 763e735 | 2012-04-25 00:16:00 +0100 | [diff] [blame] | 1747 | dma_cap_zero(mask); |
| 1748 | dma_cap_set(DMA_SLAVE, mask); |
| 1749 | sig = OMAP24XX_DMA_GPMC; |
| 1750 | info->dma = dma_request_channel(mask, omap_dma_filter_fn, &sig); |
| 1751 | if (!info->dma) { |
Russell King | 2df41d0 | 2012-04-25 00:19:39 +0100 | [diff] [blame] | 1752 | dev_err(&pdev->dev, "DMA engine request failed\n"); |
| 1753 | err = -ENXIO; |
Pekon Gupta | 70ba6d7 | 2013-10-24 18:20:25 +0530 | [diff] [blame] | 1754 | goto return_error; |
Russell King | 763e735 | 2012-04-25 00:16:00 +0100 | [diff] [blame] | 1755 | } else { |
| 1756 | struct dma_slave_config cfg; |
Russell King | 763e735 | 2012-04-25 00:16:00 +0100 | [diff] [blame] | 1757 | |
| 1758 | memset(&cfg, 0, sizeof(cfg)); |
| 1759 | cfg.src_addr = info->phys_base; |
| 1760 | cfg.dst_addr = info->phys_base; |
| 1761 | cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; |
| 1762 | cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; |
| 1763 | cfg.src_maxburst = 16; |
| 1764 | cfg.dst_maxburst = 16; |
Arnd Bergmann | d680e2c | 2012-08-04 11:05:25 +0000 | [diff] [blame] | 1765 | err = dmaengine_slave_config(info->dma, &cfg); |
| 1766 | if (err) { |
Russell King | 763e735 | 2012-04-25 00:16:00 +0100 | [diff] [blame] | 1767 | dev_err(&pdev->dev, "DMA engine slave config failed: %d\n", |
Arnd Bergmann | d680e2c | 2012-08-04 11:05:25 +0000 | [diff] [blame] | 1768 | err); |
Pekon Gupta | 70ba6d7 | 2013-10-24 18:20:25 +0530 | [diff] [blame] | 1769 | goto return_error; |
Russell King | 763e735 | 2012-04-25 00:16:00 +0100 | [diff] [blame] | 1770 | } |
Pekon Gupta | 633deb5 | 2013-10-24 18:20:19 +0530 | [diff] [blame] | 1771 | nand_chip->read_buf = omap_read_buf_dma_pref; |
| 1772 | nand_chip->write_buf = omap_write_buf_dma_pref; |
Sukumar Ghorai | 1b0b323c | 2011-01-28 15:42:04 +0530 | [diff] [blame] | 1773 | } |
| 1774 | break; |
| 1775 | |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 1776 | case NAND_OMAP_PREFETCH_IRQ: |
Afzal Mohammed | 5c46845 | 2012-08-30 12:53:24 -0700 | [diff] [blame] | 1777 | info->gpmc_irq_fifo = platform_get_irq(pdev, 0); |
| 1778 | if (info->gpmc_irq_fifo <= 0) { |
| 1779 | dev_err(&pdev->dev, "error getting fifo irq\n"); |
| 1780 | err = -ENODEV; |
Pekon Gupta | 70ba6d7 | 2013-10-24 18:20:25 +0530 | [diff] [blame] | 1781 | goto return_error; |
Afzal Mohammed | 5c46845 | 2012-08-30 12:53:24 -0700 | [diff] [blame] | 1782 | } |
Pekon Gupta | 70ba6d7 | 2013-10-24 18:20:25 +0530 | [diff] [blame] | 1783 | err = devm_request_irq(&pdev->dev, info->gpmc_irq_fifo, |
| 1784 | omap_nand_irq, IRQF_SHARED, |
| 1785 | "gpmc-nand-fifo", info); |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 1786 | if (err) { |
| 1787 | dev_err(&pdev->dev, "requesting irq(%d) error:%d", |
Afzal Mohammed | 5c46845 | 2012-08-30 12:53:24 -0700 | [diff] [blame] | 1788 | info->gpmc_irq_fifo, err); |
| 1789 | info->gpmc_irq_fifo = 0; |
Pekon Gupta | 70ba6d7 | 2013-10-24 18:20:25 +0530 | [diff] [blame] | 1790 | goto return_error; |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 1791 | } |
Afzal Mohammed | 5c46845 | 2012-08-30 12:53:24 -0700 | [diff] [blame] | 1792 | |
| 1793 | info->gpmc_irq_count = platform_get_irq(pdev, 1); |
| 1794 | if (info->gpmc_irq_count <= 0) { |
| 1795 | dev_err(&pdev->dev, "error getting count irq\n"); |
| 1796 | err = -ENODEV; |
Pekon Gupta | 70ba6d7 | 2013-10-24 18:20:25 +0530 | [diff] [blame] | 1797 | goto return_error; |
Afzal Mohammed | 5c46845 | 2012-08-30 12:53:24 -0700 | [diff] [blame] | 1798 | } |
Pekon Gupta | 70ba6d7 | 2013-10-24 18:20:25 +0530 | [diff] [blame] | 1799 | err = devm_request_irq(&pdev->dev, info->gpmc_irq_count, |
| 1800 | omap_nand_irq, IRQF_SHARED, |
| 1801 | "gpmc-nand-count", info); |
Afzal Mohammed | 5c46845 | 2012-08-30 12:53:24 -0700 | [diff] [blame] | 1802 | if (err) { |
| 1803 | dev_err(&pdev->dev, "requesting irq(%d) error:%d", |
| 1804 | info->gpmc_irq_count, err); |
| 1805 | info->gpmc_irq_count = 0; |
Pekon Gupta | 70ba6d7 | 2013-10-24 18:20:25 +0530 | [diff] [blame] | 1806 | goto return_error; |
Afzal Mohammed | 5c46845 | 2012-08-30 12:53:24 -0700 | [diff] [blame] | 1807 | } |
| 1808 | |
Pekon Gupta | 633deb5 | 2013-10-24 18:20:19 +0530 | [diff] [blame] | 1809 | nand_chip->read_buf = omap_read_buf_irq_pref; |
| 1810 | nand_chip->write_buf = omap_write_buf_irq_pref; |
Afzal Mohammed | 5c46845 | 2012-08-30 12:53:24 -0700 | [diff] [blame] | 1811 | |
Sukumar Ghorai | 4e07037 | 2011-01-28 15:42:06 +0530 | [diff] [blame] | 1812 | break; |
| 1813 | |
Sukumar Ghorai | 1b0b323c | 2011-01-28 15:42:04 +0530 | [diff] [blame] | 1814 | default: |
| 1815 | dev_err(&pdev->dev, |
| 1816 | "xfer_type(%d) not supported!\n", pdata->xfer_type); |
| 1817 | err = -EINVAL; |
Pekon Gupta | 70ba6d7 | 2013-10-24 18:20:25 +0530 | [diff] [blame] | 1818 | goto return_error; |
vimal singh | 59e9c5a | 2009-07-13 16:26:24 +0530 | [diff] [blame] | 1819 | } |
Sukumar Ghorai | 1b0b323c | 2011-01-28 15:42:04 +0530 | [diff] [blame] | 1820 | |
Pekon Gupta | a919e51 | 2013-10-24 18:20:21 +0530 | [diff] [blame] | 1821 | /* populate MTD interface based on ECC scheme */ |
Pekon Gupta | b491da7 | 2013-10-24 18:20:22 +0530 | [diff] [blame] | 1822 | nand_chip->ecc.layout = &omap_oobinfo; |
| 1823 | ecclayout = &omap_oobinfo; |
Pekon Gupta | 4e55807 | 2014-03-18 18:56:42 +0530 | [diff] [blame] | 1824 | switch (info->ecc_opt) { |
Pekon Gupta | a919e51 | 2013-10-24 18:20:21 +0530 | [diff] [blame] | 1825 | case OMAP_ECC_HAM1_CODE_HW: |
| 1826 | pr_info("nand: using OMAP_ECC_HAM1_CODE_HW\n"); |
| 1827 | nand_chip->ecc.mode = NAND_ECC_HW; |
Pekon Gupta | 633deb5 | 2013-10-24 18:20:19 +0530 | [diff] [blame] | 1828 | nand_chip->ecc.bytes = 3; |
| 1829 | nand_chip->ecc.size = 512; |
| 1830 | nand_chip->ecc.strength = 1; |
| 1831 | nand_chip->ecc.calculate = omap_calculate_ecc; |
| 1832 | nand_chip->ecc.hwctl = omap_enable_hwecc; |
| 1833 | nand_chip->ecc.correct = omap_correct_data; |
Pekon Gupta | b491da7 | 2013-10-24 18:20:22 +0530 | [diff] [blame] | 1834 | /* define ECC layout */ |
| 1835 | ecclayout->eccbytes = nand_chip->ecc.bytes * |
| 1836 | (mtd->writesize / |
| 1837 | nand_chip->ecc.size); |
| 1838 | if (nand_chip->options & NAND_BUSWIDTH_16) |
Pekon Gupta | eae39cb | 2014-02-17 13:11:23 +0530 | [diff] [blame] | 1839 | oob_index = BADBLOCK_MARKER_LENGTH; |
Pekon Gupta | b491da7 | 2013-10-24 18:20:22 +0530 | [diff] [blame] | 1840 | else |
Pekon Gupta | eae39cb | 2014-02-17 13:11:23 +0530 | [diff] [blame] | 1841 | oob_index = 1; |
| 1842 | for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) |
| 1843 | ecclayout->eccpos[i] = oob_index; |
Pekon Gupta | aa6092f | 2014-02-17 13:11:24 +0530 | [diff] [blame] | 1844 | /* no reserved-marker in ecclayout for this ecc-scheme */ |
| 1845 | ecclayout->oobfree->offset = |
| 1846 | ecclayout->eccpos[ecclayout->eccbytes - 1] + 1; |
Pekon Gupta | a919e51 | 2013-10-24 18:20:21 +0530 | [diff] [blame] | 1847 | break; |
| 1848 | |
| 1849 | case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW: |
| 1850 | #ifdef CONFIG_MTD_NAND_ECC_BCH |
| 1851 | pr_info("nand: using OMAP_ECC_BCH4_CODE_HW_DETECTION_SW\n"); |
| 1852 | nand_chip->ecc.mode = NAND_ECC_HW; |
| 1853 | nand_chip->ecc.size = 512; |
| 1854 | nand_chip->ecc.bytes = 7; |
| 1855 | nand_chip->ecc.strength = 4; |
| 1856 | nand_chip->ecc.hwctl = omap3_enable_hwecc_bch; |
Pekon Gupta | 32d42a8 | 2013-10-24 18:20:23 +0530 | [diff] [blame] | 1857 | nand_chip->ecc.correct = nand_bch_correct_data; |
Pekon Gupta | a919e51 | 2013-10-24 18:20:21 +0530 | [diff] [blame] | 1858 | nand_chip->ecc.calculate = omap3_calculate_ecc_bch4; |
Pekon Gupta | b491da7 | 2013-10-24 18:20:22 +0530 | [diff] [blame] | 1859 | /* define ECC layout */ |
| 1860 | ecclayout->eccbytes = nand_chip->ecc.bytes * |
| 1861 | (mtd->writesize / |
| 1862 | nand_chip->ecc.size); |
Pekon Gupta | eae39cb | 2014-02-17 13:11:23 +0530 | [diff] [blame] | 1863 | oob_index = BADBLOCK_MARKER_LENGTH; |
| 1864 | for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) { |
| 1865 | ecclayout->eccpos[i] = oob_index; |
| 1866 | if (((i + 1) % nand_chip->ecc.bytes) == 0) |
| 1867 | oob_index++; |
| 1868 | } |
Pekon Gupta | aa6092f | 2014-02-17 13:11:24 +0530 | [diff] [blame] | 1869 | /* include reserved-marker in ecclayout->oobfree calculation */ |
| 1870 | ecclayout->oobfree->offset = 1 + |
| 1871 | ecclayout->eccpos[ecclayout->eccbytes - 1] + 1; |
Pekon Gupta | a919e51 | 2013-10-24 18:20:21 +0530 | [diff] [blame] | 1872 | /* software bch library is used for locating errors */ |
Pekon Gupta | 32d42a8 | 2013-10-24 18:20:23 +0530 | [diff] [blame] | 1873 | nand_chip->ecc.priv = nand_bch_init(mtd, |
| 1874 | nand_chip->ecc.size, |
| 1875 | nand_chip->ecc.bytes, |
| 1876 | &nand_chip->ecc.layout); |
| 1877 | if (!nand_chip->ecc.priv) { |
Pekon Gupta | a919e51 | 2013-10-24 18:20:21 +0530 | [diff] [blame] | 1878 | pr_err("nand: error: unable to use s/w BCH library\n"); |
| 1879 | err = -EINVAL; |
| 1880 | } |
| 1881 | break; |
| 1882 | #else |
| 1883 | pr_err("nand: error: CONFIG_MTD_NAND_ECC_BCH not enabled\n"); |
| 1884 | err = -EINVAL; |
Pekon Gupta | 70ba6d7 | 2013-10-24 18:20:25 +0530 | [diff] [blame] | 1885 | goto return_error; |
Pekon Gupta | a919e51 | 2013-10-24 18:20:21 +0530 | [diff] [blame] | 1886 | #endif |
| 1887 | |
| 1888 | case OMAP_ECC_BCH4_CODE_HW: |
| 1889 | #ifdef CONFIG_MTD_NAND_OMAP_BCH |
| 1890 | pr_info("nand: using OMAP_ECC_BCH4_CODE_HW ECC scheme\n"); |
| 1891 | nand_chip->ecc.mode = NAND_ECC_HW; |
| 1892 | nand_chip->ecc.size = 512; |
| 1893 | /* 14th bit is kept reserved for ROM-code compatibility */ |
| 1894 | nand_chip->ecc.bytes = 7 + 1; |
| 1895 | nand_chip->ecc.strength = 4; |
| 1896 | nand_chip->ecc.hwctl = omap3_enable_hwecc_bch; |
| 1897 | nand_chip->ecc.correct = omap_elm_correct_data; |
| 1898 | nand_chip->ecc.calculate = omap3_calculate_ecc_bch; |
| 1899 | nand_chip->ecc.read_page = omap_read_page_bch; |
| 1900 | nand_chip->ecc.write_page = omap_write_page_bch; |
Pekon Gupta | b491da7 | 2013-10-24 18:20:22 +0530 | [diff] [blame] | 1901 | /* define ECC layout */ |
| 1902 | ecclayout->eccbytes = nand_chip->ecc.bytes * |
| 1903 | (mtd->writesize / |
| 1904 | nand_chip->ecc.size); |
Pekon Gupta | eae39cb | 2014-02-17 13:11:23 +0530 | [diff] [blame] | 1905 | oob_index = BADBLOCK_MARKER_LENGTH; |
| 1906 | for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) |
| 1907 | ecclayout->eccpos[i] = oob_index; |
Pekon Gupta | aa6092f | 2014-02-17 13:11:24 +0530 | [diff] [blame] | 1908 | /* reserved marker already included in ecclayout->eccbytes */ |
| 1909 | ecclayout->oobfree->offset = |
| 1910 | ecclayout->eccpos[ecclayout->eccbytes - 1] + 1; |
Pekon Gupta | a919e51 | 2013-10-24 18:20:21 +0530 | [diff] [blame] | 1911 | /* This ECC scheme requires ELM H/W block */ |
| 1912 | if (is_elm_present(info, pdata->elm_of_node, BCH4_ECC) < 0) { |
| 1913 | pr_err("nand: error: could not initialize ELM\n"); |
| 1914 | err = -ENODEV; |
Pekon Gupta | 70ba6d7 | 2013-10-24 18:20:25 +0530 | [diff] [blame] | 1915 | goto return_error; |
Pekon Gupta | a919e51 | 2013-10-24 18:20:21 +0530 | [diff] [blame] | 1916 | } |
| 1917 | break; |
| 1918 | #else |
| 1919 | pr_err("nand: error: CONFIG_MTD_NAND_OMAP_BCH not enabled\n"); |
| 1920 | err = -EINVAL; |
Pekon Gupta | 70ba6d7 | 2013-10-24 18:20:25 +0530 | [diff] [blame] | 1921 | goto return_error; |
Pekon Gupta | a919e51 | 2013-10-24 18:20:21 +0530 | [diff] [blame] | 1922 | #endif |
| 1923 | |
| 1924 | case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW: |
| 1925 | #ifdef CONFIG_MTD_NAND_ECC_BCH |
| 1926 | pr_info("nand: using OMAP_ECC_BCH8_CODE_HW_DETECTION_SW\n"); |
| 1927 | nand_chip->ecc.mode = NAND_ECC_HW; |
| 1928 | nand_chip->ecc.size = 512; |
| 1929 | nand_chip->ecc.bytes = 13; |
| 1930 | nand_chip->ecc.strength = 8; |
| 1931 | nand_chip->ecc.hwctl = omap3_enable_hwecc_bch; |
Pekon Gupta | 32d42a8 | 2013-10-24 18:20:23 +0530 | [diff] [blame] | 1932 | nand_chip->ecc.correct = nand_bch_correct_data; |
Pekon Gupta | a919e51 | 2013-10-24 18:20:21 +0530 | [diff] [blame] | 1933 | nand_chip->ecc.calculate = omap3_calculate_ecc_bch8; |
Pekon Gupta | b491da7 | 2013-10-24 18:20:22 +0530 | [diff] [blame] | 1934 | /* define ECC layout */ |
| 1935 | ecclayout->eccbytes = nand_chip->ecc.bytes * |
| 1936 | (mtd->writesize / |
| 1937 | nand_chip->ecc.size); |
Pekon Gupta | eae39cb | 2014-02-17 13:11:23 +0530 | [diff] [blame] | 1938 | oob_index = BADBLOCK_MARKER_LENGTH; |
| 1939 | for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) { |
| 1940 | ecclayout->eccpos[i] = oob_index; |
| 1941 | if (((i + 1) % nand_chip->ecc.bytes) == 0) |
| 1942 | oob_index++; |
| 1943 | } |
Pekon Gupta | aa6092f | 2014-02-17 13:11:24 +0530 | [diff] [blame] | 1944 | /* include reserved-marker in ecclayout->oobfree calculation */ |
| 1945 | ecclayout->oobfree->offset = 1 + |
| 1946 | ecclayout->eccpos[ecclayout->eccbytes - 1] + 1; |
Pekon Gupta | a919e51 | 2013-10-24 18:20:21 +0530 | [diff] [blame] | 1947 | /* software bch library is used for locating errors */ |
Pekon Gupta | 32d42a8 | 2013-10-24 18:20:23 +0530 | [diff] [blame] | 1948 | nand_chip->ecc.priv = nand_bch_init(mtd, |
| 1949 | nand_chip->ecc.size, |
| 1950 | nand_chip->ecc.bytes, |
| 1951 | &nand_chip->ecc.layout); |
| 1952 | if (!nand_chip->ecc.priv) { |
Pekon Gupta | a919e51 | 2013-10-24 18:20:21 +0530 | [diff] [blame] | 1953 | pr_err("nand: error: unable to use s/w BCH library\n"); |
Ivan Djelic | 0e618ef | 2012-04-30 12:17:18 +0200 | [diff] [blame] | 1954 | err = -EINVAL; |
Pekon Gupta | 70ba6d7 | 2013-10-24 18:20:25 +0530 | [diff] [blame] | 1955 | goto return_error; |
Ivan Djelic | 0e618ef | 2012-04-30 12:17:18 +0200 | [diff] [blame] | 1956 | } |
Pekon Gupta | a919e51 | 2013-10-24 18:20:21 +0530 | [diff] [blame] | 1957 | break; |
| 1958 | #else |
| 1959 | pr_err("nand: error: CONFIG_MTD_NAND_ECC_BCH not enabled\n"); |
| 1960 | err = -EINVAL; |
Pekon Gupta | 70ba6d7 | 2013-10-24 18:20:25 +0530 | [diff] [blame] | 1961 | goto return_error; |
Pekon Gupta | a919e51 | 2013-10-24 18:20:21 +0530 | [diff] [blame] | 1962 | #endif |
| 1963 | |
| 1964 | case OMAP_ECC_BCH8_CODE_HW: |
| 1965 | #ifdef CONFIG_MTD_NAND_OMAP_BCH |
| 1966 | pr_info("nand: using OMAP_ECC_BCH8_CODE_HW ECC scheme\n"); |
| 1967 | nand_chip->ecc.mode = NAND_ECC_HW; |
| 1968 | nand_chip->ecc.size = 512; |
| 1969 | /* 14th bit is kept reserved for ROM-code compatibility */ |
| 1970 | nand_chip->ecc.bytes = 13 + 1; |
| 1971 | nand_chip->ecc.strength = 8; |
| 1972 | nand_chip->ecc.hwctl = omap3_enable_hwecc_bch; |
| 1973 | nand_chip->ecc.correct = omap_elm_correct_data; |
| 1974 | nand_chip->ecc.calculate = omap3_calculate_ecc_bch; |
| 1975 | nand_chip->ecc.read_page = omap_read_page_bch; |
| 1976 | nand_chip->ecc.write_page = omap_write_page_bch; |
| 1977 | /* This ECC scheme requires ELM H/W block */ |
Wei Yongjun | 9211439 | 2013-11-01 08:16:18 +0800 | [diff] [blame] | 1978 | err = is_elm_present(info, pdata->elm_of_node, BCH8_ECC); |
| 1979 | if (err < 0) { |
Pekon Gupta | a919e51 | 2013-10-24 18:20:21 +0530 | [diff] [blame] | 1980 | pr_err("nand: error: could not initialize ELM\n"); |
Pekon Gupta | 70ba6d7 | 2013-10-24 18:20:25 +0530 | [diff] [blame] | 1981 | goto return_error; |
Pekon Gupta | a919e51 | 2013-10-24 18:20:21 +0530 | [diff] [blame] | 1982 | } |
Pekon Gupta | b491da7 | 2013-10-24 18:20:22 +0530 | [diff] [blame] | 1983 | /* define ECC layout */ |
| 1984 | ecclayout->eccbytes = nand_chip->ecc.bytes * |
| 1985 | (mtd->writesize / |
| 1986 | nand_chip->ecc.size); |
Pekon Gupta | eae39cb | 2014-02-17 13:11:23 +0530 | [diff] [blame] | 1987 | oob_index = BADBLOCK_MARKER_LENGTH; |
| 1988 | for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) |
| 1989 | ecclayout->eccpos[i] = oob_index; |
Pekon Gupta | aa6092f | 2014-02-17 13:11:24 +0530 | [diff] [blame] | 1990 | /* reserved marker already included in ecclayout->eccbytes */ |
| 1991 | ecclayout->oobfree->offset = |
| 1992 | ecclayout->eccpos[ecclayout->eccbytes - 1] + 1; |
Pekon Gupta | a919e51 | 2013-10-24 18:20:21 +0530 | [diff] [blame] | 1993 | break; |
| 1994 | #else |
| 1995 | pr_err("nand: error: CONFIG_MTD_NAND_OMAP_BCH not enabled\n"); |
| 1996 | err = -EINVAL; |
Pekon Gupta | 70ba6d7 | 2013-10-24 18:20:25 +0530 | [diff] [blame] | 1997 | goto return_error; |
Pekon Gupta | a919e51 | 2013-10-24 18:20:21 +0530 | [diff] [blame] | 1998 | #endif |
| 1999 | |
| 2000 | default: |
| 2001 | pr_err("nand: error: invalid or unsupported ECC scheme\n"); |
| 2002 | err = -EINVAL; |
Pekon Gupta | 70ba6d7 | 2013-10-24 18:20:25 +0530 | [diff] [blame] | 2003 | goto return_error; |
Sukumar Ghorai | f3d73f3 | 2011-01-28 15:42:08 +0530 | [diff] [blame] | 2004 | } |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 2005 | |
Pekon Gupta | bb38eef | 2014-02-17 13:11:25 +0530 | [diff] [blame] | 2006 | /* all OOB bytes from oobfree->offset till end off OOB are free */ |
| 2007 | ecclayout->oobfree->length = mtd->oobsize - ecclayout->oobfree->offset; |
Pekon Gupta | b491da7 | 2013-10-24 18:20:22 +0530 | [diff] [blame] | 2008 | /* check if NAND device's OOB is enough to store ECC signatures */ |
| 2009 | if (mtd->oobsize < (ecclayout->eccbytes + BADBLOCK_MARKER_LENGTH)) { |
| 2010 | pr_err("not enough OOB bytes required = %d, available=%d\n", |
| 2011 | ecclayout->eccbytes, mtd->oobsize); |
| 2012 | err = -EINVAL; |
Pekon Gupta | 70ba6d7 | 2013-10-24 18:20:25 +0530 | [diff] [blame] | 2013 | goto return_error; |
Sukumar Ghorai | f040d33 | 2011-01-28 15:42:09 +0530 | [diff] [blame] | 2014 | } |
Sukumar Ghorai | 1b0b323c | 2011-01-28 15:42:04 +0530 | [diff] [blame] | 2015 | |
Jan Weitzel | a80f1c1 | 2011-04-19 16:15:34 +0200 | [diff] [blame] | 2016 | /* second phase scan */ |
Pekon Gupta | 633deb5 | 2013-10-24 18:20:19 +0530 | [diff] [blame] | 2017 | if (nand_scan_tail(mtd)) { |
Jan Weitzel | a80f1c1 | 2011-04-19 16:15:34 +0200 | [diff] [blame] | 2018 | err = -ENXIO; |
Pekon Gupta | 70ba6d7 | 2013-10-24 18:20:25 +0530 | [diff] [blame] | 2019 | goto return_error; |
Jan Weitzel | a80f1c1 | 2011-04-19 16:15:34 +0200 | [diff] [blame] | 2020 | } |
| 2021 | |
Daniel Mack | ccf04c5 | 2012-12-14 11:36:41 +0100 | [diff] [blame] | 2022 | ppdata.of_node = pdata->of_node; |
Pekon Gupta | 633deb5 | 2013-10-24 18:20:19 +0530 | [diff] [blame] | 2023 | mtd_device_parse_register(mtd, NULL, &ppdata, pdata->parts, |
Artem Bityutskiy | 42d7fbe | 2012-03-09 19:24:26 +0200 | [diff] [blame] | 2024 | pdata->nr_parts); |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 2025 | |
Pekon Gupta | 633deb5 | 2013-10-24 18:20:19 +0530 | [diff] [blame] | 2026 | platform_set_drvdata(pdev, mtd); |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 2027 | |
| 2028 | return 0; |
| 2029 | |
Pekon Gupta | 70ba6d7 | 2013-10-24 18:20:25 +0530 | [diff] [blame] | 2030 | return_error: |
Russell King | 763e735 | 2012-04-25 00:16:00 +0100 | [diff] [blame] | 2031 | if (info->dma) |
| 2032 | dma_release_channel(info->dma); |
Pekon Gupta | 32d42a8 | 2013-10-24 18:20:23 +0530 | [diff] [blame] | 2033 | if (nand_chip->ecc.priv) { |
| 2034 | nand_bch_free(nand_chip->ecc.priv); |
| 2035 | nand_chip->ecc.priv = NULL; |
| 2036 | } |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 2037 | return err; |
| 2038 | } |
| 2039 | |
| 2040 | static int omap_nand_remove(struct platform_device *pdev) |
| 2041 | { |
| 2042 | struct mtd_info *mtd = platform_get_drvdata(pdev); |
Pekon Gupta | 633deb5 | 2013-10-24 18:20:19 +0530 | [diff] [blame] | 2043 | struct nand_chip *nand_chip = mtd->priv; |
Vimal Singh | f35b6ed | 2010-01-05 16:01:08 +0530 | [diff] [blame] | 2044 | struct omap_nand_info *info = container_of(mtd, struct omap_nand_info, |
| 2045 | mtd); |
Pekon Gupta | 32d42a8 | 2013-10-24 18:20:23 +0530 | [diff] [blame] | 2046 | if (nand_chip->ecc.priv) { |
| 2047 | nand_bch_free(nand_chip->ecc.priv); |
| 2048 | nand_chip->ecc.priv = NULL; |
| 2049 | } |
Russell King | 763e735 | 2012-04-25 00:16:00 +0100 | [diff] [blame] | 2050 | if (info->dma) |
| 2051 | dma_release_channel(info->dma); |
Pekon Gupta | 633deb5 | 2013-10-24 18:20:19 +0530 | [diff] [blame] | 2052 | nand_release(mtd); |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 2053 | return 0; |
| 2054 | } |
| 2055 | |
| 2056 | static struct platform_driver omap_nand_driver = { |
| 2057 | .probe = omap_nand_probe, |
| 2058 | .remove = omap_nand_remove, |
| 2059 | .driver = { |
| 2060 | .name = DRIVER_NAME, |
| 2061 | .owner = THIS_MODULE, |
| 2062 | }, |
| 2063 | }; |
| 2064 | |
Axel Lin | f99640d | 2011-11-27 20:45:03 +0800 | [diff] [blame] | 2065 | module_platform_driver(omap_nand_driver); |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 2066 | |
Axel Lin | c804c73 | 2011-03-07 11:04:24 +0800 | [diff] [blame] | 2067 | MODULE_ALIAS("platform:" DRIVER_NAME); |
Vimal Singh | 67ce04b | 2009-05-12 13:47:03 -0700 | [diff] [blame] | 2068 | MODULE_LICENSE("GPL"); |
| 2069 | MODULE_DESCRIPTION("Glue layer for NAND flash on TI OMAP boards"); |