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83d290c5 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
dcfd37e5 VZ |
2 | /* |
3 | * LPC32xx SLC NAND flash controller driver | |
4 | * | |
44cdfc0e VZ |
5 | * (C) Copyright 2015-2018 Vladimir Zapolskiy <vz@mleia.com> |
6 | * Copyright (c) 2015 Tyco Fire Protection Products. | |
dcfd37e5 | 7 | * |
5f63bf3e SL |
8 | * Hardware ECC support original source code |
9 | * Copyright (C) 2008 by NXP Semiconductors | |
10 | * Author: Kevin Wells | |
dcfd37e5 VZ |
11 | */ |
12 | ||
d678a59d | 13 | #include <common.h> |
f7ae49fc | 14 | #include <log.h> |
dcfd37e5 | 15 | #include <nand.h> |
eb41d8a1 | 16 | #include <linux/bug.h> |
5f63bf3e | 17 | #include <linux/mtd/nand_ecc.h> |
1cefed1e | 18 | #include <linux/mtd/rawnand.h> |
1221ce45 | 19 | #include <linux/errno.h> |
dcfd37e5 | 20 | #include <asm/io.h> |
5f63bf3e | 21 | #include <asm/arch/config.h> |
dcfd37e5 VZ |
22 | #include <asm/arch/clk.h> |
23 | #include <asm/arch/sys_proto.h> | |
5f63bf3e SL |
24 | #include <asm/arch/dma.h> |
25 | #include <asm/arch/cpu.h> | |
1e94b46f | 26 | #include <linux/printk.h> |
5f63bf3e | 27 | |
dcfd37e5 VZ |
28 | struct lpc32xx_nand_slc_regs { |
29 | u32 data; | |
30 | u32 addr; | |
31 | u32 cmd; | |
32 | u32 stop; | |
33 | u32 ctrl; | |
34 | u32 cfg; | |
35 | u32 stat; | |
36 | u32 int_stat; | |
37 | u32 ien; | |
38 | u32 isr; | |
39 | u32 icr; | |
40 | u32 tac; | |
41 | u32 tc; | |
42 | u32 ecc; | |
43 | u32 dma_data; | |
44 | }; | |
45 | ||
46 | /* CFG register */ | |
47 | #define CFG_CE_LOW (1 << 5) | |
5f63bf3e SL |
48 | #define CFG_DMA_ECC (1 << 4) /* Enable DMA ECC bit */ |
49 | #define CFG_ECC_EN (1 << 3) /* ECC enable bit */ | |
50 | #define CFG_DMA_BURST (1 << 2) /* DMA burst bit */ | |
51 | #define CFG_DMA_DIR (1 << 1) /* DMA write(0)/read(1) bit */ | |
dcfd37e5 VZ |
52 | |
53 | /* CTRL register */ | |
54 | #define CTRL_SW_RESET (1 << 2) | |
5f63bf3e SL |
55 | #define CTRL_ECC_CLEAR (1 << 1) /* Reset ECC bit */ |
56 | #define CTRL_DMA_START (1 << 0) /* Start DMA channel bit */ | |
dcfd37e5 VZ |
57 | |
58 | /* STAT register */ | |
5f63bf3e | 59 | #define STAT_DMA_FIFO (1 << 2) /* DMA FIFO has data bit */ |
dcfd37e5 VZ |
60 | #define STAT_NAND_READY (1 << 0) |
61 | ||
62 | /* INT_STAT register */ | |
63 | #define INT_STAT_TC (1 << 1) | |
64 | #define INT_STAT_RDY (1 << 0) | |
65 | ||
66 | /* TAC register bits, be aware of overflows */ | |
67 | #define TAC_W_RDY(n) (max_t(uint32_t, (n), 0xF) << 28) | |
68 | #define TAC_W_WIDTH(n) (max_t(uint32_t, (n), 0xF) << 24) | |
69 | #define TAC_W_HOLD(n) (max_t(uint32_t, (n), 0xF) << 20) | |
70 | #define TAC_W_SETUP(n) (max_t(uint32_t, (n), 0xF) << 16) | |
71 | #define TAC_R_RDY(n) (max_t(uint32_t, (n), 0xF) << 12) | |
72 | #define TAC_R_WIDTH(n) (max_t(uint32_t, (n), 0xF) << 8) | |
73 | #define TAC_R_HOLD(n) (max_t(uint32_t, (n), 0xF) << 4) | |
74 | #define TAC_R_SETUP(n) (max_t(uint32_t, (n), 0xF) << 0) | |
75 | ||
30cb3bf4 SL |
76 | /* NAND ECC Layout for small page NAND devices |
77 | * Note: For large page devices, the default layouts are used. */ | |
78 | static struct nand_ecclayout lpc32xx_nand_oob_16 = { | |
79 | .eccbytes = 6, | |
44cdfc0e | 80 | .eccpos = { 10, 11, 12, 13, 14, 15, }, |
30cb3bf4 | 81 | .oobfree = { |
44cdfc0e VZ |
82 | { .offset = 0, .length = 4, }, |
83 | { .offset = 6, .length = 4, }, | |
84 | } | |
30cb3bf4 SL |
85 | }; |
86 | ||
44cdfc0e | 87 | #if defined(CONFIG_DMA_LPC32XX) && !defined(CONFIG_SPL_BUILD) |
4e590945 | 88 | #define ECCSTEPS (CONFIG_SYS_NAND_PAGE_SIZE / CFG_SYS_NAND_ECCSIZE) |
5f63bf3e SL |
89 | |
90 | /* | |
91 | * DMA Descriptors | |
92 | * For Large Block: 17 descriptors = ((16 Data and ECC Read) + 1 Spare Area) | |
93 | * For Small Block: 5 descriptors = ((4 Data and ECC Read) + 1 Spare Area) | |
94 | */ | |
95 | static struct lpc32xx_dmac_ll dmalist[ECCSTEPS * 2 + 1]; | |
96 | static u32 ecc_buffer[8]; /* MAX ECC size */ | |
97 | static unsigned int dmachan = (unsigned int)-1; /* Invalid channel */ | |
98 | ||
99 | /* | |
100 | * Helper macro for the DMA client (i.e. NAND SLC): | |
101 | * - to write the next DMA linked list item address | |
102 | * (see arch/include/asm/arch-lpc32xx/dma.h). | |
103 | * - to assign the DMA data register to DMA source or destination address. | |
104 | * - to assign the ECC register to DMA source or destination address. | |
105 | */ | |
106 | #define lpc32xx_dmac_next_lli(x) ((u32)x) | |
107 | #define lpc32xx_dmac_set_dma_data() ((u32)&lpc32xx_nand_slc_regs->dma_data) | |
108 | #define lpc32xx_dmac_set_ecc() ((u32)&lpc32xx_nand_slc_regs->ecc) | |
109 | #endif | |
110 | ||
dcfd37e5 VZ |
111 | static struct lpc32xx_nand_slc_regs __iomem *lpc32xx_nand_slc_regs |
112 | = (struct lpc32xx_nand_slc_regs __iomem *)SLC_NAND_BASE; | |
113 | ||
114 | static void lpc32xx_nand_init(void) | |
115 | { | |
116 | uint32_t hclk = get_hclk_clk_rate(); | |
117 | ||
118 | /* Reset SLC NAND controller */ | |
119 | writel(CTRL_SW_RESET, &lpc32xx_nand_slc_regs->ctrl); | |
120 | ||
121 | /* 8-bit bus, no DMA, no ECC, ordinary CE signal */ | |
122 | writel(0, &lpc32xx_nand_slc_regs->cfg); | |
123 | ||
124 | /* Interrupts disabled and cleared */ | |
125 | writel(0, &lpc32xx_nand_slc_regs->ien); | |
126 | writel(INT_STAT_TC | INT_STAT_RDY, | |
127 | &lpc32xx_nand_slc_regs->icr); | |
128 | ||
129 | /* Configure NAND flash timings */ | |
fa32dc7d | 130 | writel(TAC_W_RDY(CFG_LPC32XX_NAND_SLC_WDR_CLKS) | |
bd79d3d6 | 131 | TAC_W_WIDTH(hclk / CFG_LPC32XX_NAND_SLC_WWIDTH) | |
b0c54827 | 132 | TAC_W_HOLD(hclk / CFG_LPC32XX_NAND_SLC_WHOLD) | |
308ed808 | 133 | TAC_W_SETUP(hclk / CFG_LPC32XX_NAND_SLC_WSETUP) | |
c102eb5c | 134 | TAC_R_RDY(CFG_LPC32XX_NAND_SLC_RDR_CLKS) | |
fa0e72a3 | 135 | TAC_R_WIDTH(hclk / CFG_LPC32XX_NAND_SLC_RWIDTH) | |
bba52ab0 | 136 | TAC_R_HOLD(hclk / CFG_LPC32XX_NAND_SLC_RHOLD) | |
416ef8c7 | 137 | TAC_R_SETUP(hclk / CFG_LPC32XX_NAND_SLC_RSETUP), |
dcfd37e5 VZ |
138 | &lpc32xx_nand_slc_regs->tac); |
139 | } | |
140 | ||
141 | static void lpc32xx_nand_cmd_ctrl(struct mtd_info *mtd, | |
142 | int cmd, unsigned int ctrl) | |
143 | { | |
144 | debug("ctrl: 0x%08x, cmd: 0x%08x\n", ctrl, cmd); | |
145 | ||
146 | if (ctrl & NAND_NCE) | |
147 | setbits_le32(&lpc32xx_nand_slc_regs->cfg, CFG_CE_LOW); | |
148 | else | |
149 | clrbits_le32(&lpc32xx_nand_slc_regs->cfg, CFG_CE_LOW); | |
150 | ||
151 | if (cmd == NAND_CMD_NONE) | |
152 | return; | |
153 | ||
154 | if (ctrl & NAND_CLE) | |
155 | writel(cmd & 0xFF, &lpc32xx_nand_slc_regs->cmd); | |
156 | else if (ctrl & NAND_ALE) | |
157 | writel(cmd & 0xFF, &lpc32xx_nand_slc_regs->addr); | |
158 | } | |
159 | ||
160 | static int lpc32xx_nand_dev_ready(struct mtd_info *mtd) | |
161 | { | |
162 | return readl(&lpc32xx_nand_slc_regs->stat) & STAT_NAND_READY; | |
163 | } | |
164 | ||
44cdfc0e | 165 | #if defined(CONFIG_DMA_LPC32XX) && !defined(CONFIG_SPL_BUILD) |
5f63bf3e SL |
166 | /* |
167 | * Prepares DMA descriptors for NAND RD/WR operations | |
168 | * If the size is < 256 Bytes then it is assumed to be | |
169 | * an OOB transfer | |
170 | */ | |
171 | static void lpc32xx_nand_dma_configure(struct nand_chip *chip, | |
172 | const u8 *buffer, int size, | |
173 | int read) | |
174 | { | |
175 | u32 i, dmasrc, ctrl, ecc_ctrl, oob_ctrl, dmadst; | |
176 | struct lpc32xx_dmac_ll *dmalist_cur; | |
177 | struct lpc32xx_dmac_ll *dmalist_cur_ecc; | |
178 | ||
179 | /* | |
180 | * CTRL descriptor entry for reading ECC | |
181 | * Copy Multiple times to sync DMA with Flash Controller | |
182 | */ | |
183 | ecc_ctrl = 0x5 | | |
184 | DMAC_CHAN_SRC_BURST_1 | | |
185 | DMAC_CHAN_DEST_BURST_1 | | |
186 | DMAC_CHAN_SRC_WIDTH_32 | | |
187 | DMAC_CHAN_DEST_WIDTH_32 | | |
188 | DMAC_CHAN_DEST_AHB1; | |
189 | ||
190 | /* CTRL descriptor entry for reading/writing Data */ | |
4e590945 | 191 | ctrl = (CFG_SYS_NAND_ECCSIZE / 4) | |
5f63bf3e SL |
192 | DMAC_CHAN_SRC_BURST_4 | |
193 | DMAC_CHAN_DEST_BURST_4 | | |
194 | DMAC_CHAN_SRC_WIDTH_32 | | |
195 | DMAC_CHAN_DEST_WIDTH_32 | | |
196 | DMAC_CHAN_DEST_AHB1; | |
197 | ||
198 | /* CTRL descriptor entry for reading/writing Spare Area */ | |
199 | oob_ctrl = (CONFIG_SYS_NAND_OOBSIZE / 4) | | |
200 | DMAC_CHAN_SRC_BURST_4 | | |
201 | DMAC_CHAN_DEST_BURST_4 | | |
202 | DMAC_CHAN_SRC_WIDTH_32 | | |
203 | DMAC_CHAN_DEST_WIDTH_32 | | |
204 | DMAC_CHAN_DEST_AHB1; | |
205 | ||
206 | if (read) { | |
207 | dmasrc = lpc32xx_dmac_set_dma_data(); | |
208 | dmadst = (u32)buffer; | |
209 | ctrl |= DMAC_CHAN_DEST_AUTOINC; | |
210 | } else { | |
211 | dmadst = lpc32xx_dmac_set_dma_data(); | |
212 | dmasrc = (u32)buffer; | |
213 | ctrl |= DMAC_CHAN_SRC_AUTOINC; | |
214 | } | |
215 | ||
216 | /* | |
217 | * Write Operation Sequence for Small Block NAND | |
218 | * ---------------------------------------------------------- | |
219 | * 1. X'fer 256 bytes of data from Memory to Flash. | |
220 | * 2. Copy generated ECC data from Register to Spare Area | |
221 | * 3. X'fer next 256 bytes of data from Memory to Flash. | |
222 | * 4. Copy generated ECC data from Register to Spare Area. | |
223 | * 5. X'fer 16 byets of Spare area from Memory to Flash. | |
224 | * Read Operation Sequence for Small Block NAND | |
225 | * ---------------------------------------------------------- | |
226 | * 1. X'fer 256 bytes of data from Flash to Memory. | |
227 | * 2. Copy generated ECC data from Register to ECC calc Buffer. | |
228 | * 3. X'fer next 256 bytes of data from Flash to Memory. | |
229 | * 4. Copy generated ECC data from Register to ECC calc Buffer. | |
230 | * 5. X'fer 16 bytes of Spare area from Flash to Memory. | |
231 | * Write Operation Sequence for Large Block NAND | |
232 | * ---------------------------------------------------------- | |
233 | * 1. Steps(1-4) of Write Operations repeate for four times | |
234 | * which generates 16 DMA descriptors to X'fer 2048 bytes of | |
235 | * data & 32 bytes of ECC data. | |
236 | * 2. X'fer 64 bytes of Spare area from Memory to Flash. | |
237 | * Read Operation Sequence for Large Block NAND | |
238 | * ---------------------------------------------------------- | |
239 | * 1. Steps(1-4) of Read Operations repeate for four times | |
240 | * which generates 16 DMA descriptors to X'fer 2048 bytes of | |
241 | * data & 32 bytes of ECC data. | |
242 | * 2. X'fer 64 bytes of Spare area from Flash to Memory. | |
243 | */ | |
244 | ||
4e590945 | 245 | for (i = 0; i < size/CFG_SYS_NAND_ECCSIZE; i++) { |
5f63bf3e SL |
246 | dmalist_cur = &dmalist[i * 2]; |
247 | dmalist_cur_ecc = &dmalist[(i * 2) + 1]; | |
248 | ||
249 | dmalist_cur->dma_src = (read ? (dmasrc) : (dmasrc + (i*256))); | |
250 | dmalist_cur->dma_dest = (read ? (dmadst + (i*256)) : dmadst); | |
251 | dmalist_cur->next_lli = lpc32xx_dmac_next_lli(dmalist_cur_ecc); | |
252 | dmalist_cur->next_ctrl = ctrl; | |
253 | ||
254 | dmalist_cur_ecc->dma_src = lpc32xx_dmac_set_ecc(); | |
255 | dmalist_cur_ecc->dma_dest = (u32)&ecc_buffer[i]; | |
256 | dmalist_cur_ecc->next_lli = | |
257 | lpc32xx_dmac_next_lli(&dmalist[(i * 2) + 2]); | |
258 | dmalist_cur_ecc->next_ctrl = ecc_ctrl; | |
259 | } | |
260 | ||
261 | if (i) { /* Data only transfer */ | |
262 | dmalist_cur_ecc = &dmalist[(i * 2) - 1]; | |
263 | dmalist_cur_ecc->next_lli = 0; | |
264 | dmalist_cur_ecc->next_ctrl |= DMAC_CHAN_INT_TC_EN; | |
265 | return; | |
266 | } | |
267 | ||
268 | /* OOB only transfer */ | |
269 | if (read) { | |
270 | dmasrc = lpc32xx_dmac_set_dma_data(); | |
271 | dmadst = (u32)buffer; | |
272 | oob_ctrl |= DMAC_CHAN_DEST_AUTOINC; | |
273 | } else { | |
274 | dmadst = lpc32xx_dmac_set_dma_data(); | |
275 | dmasrc = (u32)buffer; | |
276 | oob_ctrl |= DMAC_CHAN_SRC_AUTOINC; | |
277 | } | |
278 | ||
279 | /* Read/ Write Spare Area Data To/From Flash */ | |
280 | dmalist_cur = &dmalist[i * 2]; | |
281 | dmalist_cur->dma_src = dmasrc; | |
282 | dmalist_cur->dma_dest = dmadst; | |
283 | dmalist_cur->next_lli = 0; | |
284 | dmalist_cur->next_ctrl = (oob_ctrl | DMAC_CHAN_INT_TC_EN); | |
285 | } | |
286 | ||
287 | static void lpc32xx_nand_xfer(struct mtd_info *mtd, const u8 *buf, | |
288 | int len, int read) | |
289 | { | |
17cb4b8f | 290 | struct nand_chip *chip = mtd_to_nand(mtd); |
5f63bf3e SL |
291 | u32 config; |
292 | int ret; | |
293 | ||
294 | /* DMA Channel Configuration */ | |
295 | config = (read ? DMAC_CHAN_FLOW_D_P2M : DMAC_CHAN_FLOW_D_M2P) | | |
296 | (read ? DMAC_DEST_PERIP(0) : DMAC_DEST_PERIP(DMA_PERID_NAND1)) | | |
297 | (read ? DMAC_SRC_PERIP(DMA_PERID_NAND1) : DMAC_SRC_PERIP(0)) | | |
298 | DMAC_CHAN_ENABLE; | |
299 | ||
300 | /* Prepare DMA descriptors */ | |
301 | lpc32xx_nand_dma_configure(chip, buf, len, read); | |
302 | ||
303 | /* Setup SLC controller and start transfer */ | |
304 | if (read) | |
305 | setbits_le32(&lpc32xx_nand_slc_regs->cfg, CFG_DMA_DIR); | |
306 | else /* NAND_ECC_WRITE */ | |
307 | clrbits_le32(&lpc32xx_nand_slc_regs->cfg, CFG_DMA_DIR); | |
308 | setbits_le32(&lpc32xx_nand_slc_regs->cfg, CFG_DMA_BURST); | |
309 | ||
310 | /* Write length for new transfers */ | |
311 | if (!((readl(&lpc32xx_nand_slc_regs->stat) & STAT_DMA_FIFO) | | |
312 | readl(&lpc32xx_nand_slc_regs->tc))) { | |
313 | int tmp = (len != mtd->oobsize) ? mtd->oobsize : 0; | |
314 | writel(len + tmp, &lpc32xx_nand_slc_regs->tc); | |
315 | } | |
316 | ||
317 | setbits_le32(&lpc32xx_nand_slc_regs->ctrl, CTRL_DMA_START); | |
318 | ||
319 | /* Start DMA transfers */ | |
320 | ret = lpc32xx_dma_start_xfer(dmachan, dmalist, config); | |
321 | if (unlikely(ret < 0)) | |
322 | BUG(); | |
323 | ||
5f63bf3e SL |
324 | /* Wait for NAND to be ready */ |
325 | while (!lpc32xx_nand_dev_ready(mtd)) | |
326 | ; | |
327 | ||
328 | /* Wait till DMA transfer is DONE */ | |
329 | if (lpc32xx_dma_wait_status(dmachan)) | |
330 | pr_err("NAND DMA transfer error!\r\n"); | |
331 | ||
332 | /* Stop DMA & HW ECC */ | |
333 | clrbits_le32(&lpc32xx_nand_slc_regs->ctrl, CTRL_DMA_START); | |
334 | clrbits_le32(&lpc32xx_nand_slc_regs->cfg, | |
335 | CFG_DMA_DIR | CFG_DMA_BURST | CFG_ECC_EN | CFG_DMA_ECC); | |
336 | } | |
337 | ||
338 | static u32 slc_ecc_copy_to_buffer(u8 *spare, const u32 *ecc, int count) | |
339 | { | |
340 | int i; | |
4e590945 TR |
341 | for (i = 0; i < (count * CFG_SYS_NAND_ECCBYTES); |
342 | i += CFG_SYS_NAND_ECCBYTES) { | |
343 | u32 ce = ecc[i / CFG_SYS_NAND_ECCBYTES]; | |
5f63bf3e SL |
344 | ce = ~(ce << 2) & 0xFFFFFF; |
345 | spare[i+2] = (u8)(ce & 0xFF); ce >>= 8; | |
346 | spare[i+1] = (u8)(ce & 0xFF); ce >>= 8; | |
347 | spare[i] = (u8)(ce & 0xFF); | |
348 | } | |
349 | return 0; | |
350 | } | |
351 | ||
352 | static int lpc32xx_ecc_calculate(struct mtd_info *mtd, const uint8_t *dat, | |
353 | uint8_t *ecc_code) | |
354 | { | |
355 | return slc_ecc_copy_to_buffer(ecc_code, ecc_buffer, ECCSTEPS); | |
356 | } | |
357 | ||
358 | /* | |
359 | * Enables and prepares SLC NAND controller | |
360 | * for doing data transfers with H/W ECC enabled. | |
361 | */ | |
362 | static void lpc32xx_hwecc_enable(struct mtd_info *mtd, int mode) | |
363 | { | |
364 | /* Clear ECC */ | |
365 | writel(CTRL_ECC_CLEAR, &lpc32xx_nand_slc_regs->ctrl); | |
366 | ||
367 | /* Setup SLC controller for H/W ECC operations */ | |
368 | setbits_le32(&lpc32xx_nand_slc_regs->cfg, CFG_ECC_EN | CFG_DMA_ECC); | |
369 | } | |
370 | ||
371 | /* | |
372 | * lpc32xx_correct_data - [NAND Interface] Detect and correct bit error(s) | |
373 | * mtd: MTD block structure | |
374 | * dat: raw data read from the chip | |
375 | * read_ecc: ECC from the chip | |
376 | * calc_ecc: the ECC calculated from raw data | |
377 | * | |
378 | * Detect and correct a 1 bit error for 256 byte block | |
379 | */ | |
380 | int lpc32xx_correct_data(struct mtd_info *mtd, u_char *dat, | |
381 | u_char *read_ecc, u_char *calc_ecc) | |
382 | { | |
383 | unsigned int i; | |
384 | int ret1, ret2 = 0; | |
385 | u_char *r = read_ecc; | |
386 | u_char *c = calc_ecc; | |
387 | u16 data_offset = 0; | |
388 | ||
389 | for (i = 0 ; i < ECCSTEPS ; i++) { | |
4e590945 TR |
390 | r += CFG_SYS_NAND_ECCBYTES; |
391 | c += CFG_SYS_NAND_ECCBYTES; | |
392 | data_offset += CFG_SYS_NAND_ECCSIZE; | |
5f63bf3e SL |
393 | |
394 | ret1 = nand_correct_data(mtd, dat + data_offset, r, c); | |
395 | if (ret1 < 0) | |
396 | return -EBADMSG; | |
397 | else | |
398 | ret2 += ret1; | |
399 | } | |
400 | ||
401 | return ret2; | |
402 | } | |
5f63bf3e | 403 | |
5f63bf3e SL |
404 | static void lpc32xx_dma_read_buf(struct mtd_info *mtd, uint8_t *buf, int len) |
405 | { | |
406 | lpc32xx_nand_xfer(mtd, buf, len, 1); | |
407 | } | |
dcfd37e5 | 408 | |
5f63bf3e SL |
409 | static void lpc32xx_dma_write_buf(struct mtd_info *mtd, const uint8_t *buf, |
410 | int len) | |
411 | { | |
412 | lpc32xx_nand_xfer(mtd, buf, len, 0); | |
413 | } | |
dcfd37e5 | 414 | |
5f63bf3e SL |
415 | /* Reuse the logic from "nand_read_page_hwecc()" */ |
416 | static int lpc32xx_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip, | |
417 | uint8_t *buf, int oob_required, int page) | |
418 | { | |
419 | int i; | |
420 | int stat; | |
421 | uint8_t *p = buf; | |
422 | uint8_t *ecc_calc = chip->buffers->ecccalc; | |
423 | uint8_t *ecc_code = chip->buffers->ecccode; | |
424 | uint32_t *eccpos = chip->ecc.layout->eccpos; | |
425 | unsigned int max_bitflips = 0; | |
426 | ||
427 | /* | |
428 | * As per the "LPC32x0 and LPC32x0/01 User manual" table 173 notes | |
429 | * and section 9.7, the NAND SLC & DMA allowed single DMA transaction | |
430 | * of a page size using DMA controller scatter/gather mode through | |
431 | * linked list; the ECC read is done without any software intervention. | |
432 | */ | |
433 | ||
434 | lpc32xx_hwecc_enable(mtd, NAND_ECC_READ); | |
435 | lpc32xx_dma_read_buf(mtd, p, chip->ecc.size * chip->ecc.steps); | |
436 | lpc32xx_ecc_calculate(mtd, p, &ecc_calc[0]); | |
437 | lpc32xx_dma_read_buf(mtd, chip->oob_poi, mtd->oobsize); | |
438 | ||
439 | for (i = 0; i < chip->ecc.total; i++) | |
440 | ecc_code[i] = chip->oob_poi[eccpos[i]]; | |
441 | ||
442 | stat = chip->ecc.correct(mtd, p, &ecc_code[0], &ecc_calc[0]); | |
443 | if (stat < 0) | |
444 | mtd->ecc_stats.failed++; | |
445 | else { | |
446 | mtd->ecc_stats.corrected += stat; | |
447 | max_bitflips = max_t(unsigned int, max_bitflips, stat); | |
448 | } | |
449 | ||
450 | return max_bitflips; | |
451 | } | |
452 | ||
453 | /* Reuse the logic from "nand_write_page_hwecc()" */ | |
454 | static int lpc32xx_write_page_hwecc(struct mtd_info *mtd, | |
455 | struct nand_chip *chip, | |
81c77252 SW |
456 | const uint8_t *buf, int oob_required, |
457 | int page) | |
5f63bf3e SL |
458 | { |
459 | int i; | |
460 | uint8_t *ecc_calc = chip->buffers->ecccalc; | |
461 | const uint8_t *p = buf; | |
462 | uint32_t *eccpos = chip->ecc.layout->eccpos; | |
463 | ||
464 | /* | |
465 | * As per the "LPC32x0 and LPC32x0/01 User manual" table 173 notes | |
466 | * and section 9.7, the NAND SLC & DMA allowed single DMA transaction | |
467 | * of a page size using DMA controller scatter/gather mode through | |
468 | * linked list; the ECC read is done without any software intervention. | |
469 | */ | |
470 | ||
471 | lpc32xx_hwecc_enable(mtd, NAND_ECC_WRITE); | |
472 | lpc32xx_dma_write_buf(mtd, p, chip->ecc.size * chip->ecc.steps); | |
473 | lpc32xx_ecc_calculate(mtd, p, &ecc_calc[0]); | |
474 | ||
475 | for (i = 0; i < chip->ecc.total; i++) | |
476 | chip->oob_poi[eccpos[i]] = ecc_calc[i]; | |
477 | ||
478 | lpc32xx_dma_write_buf(mtd, chip->oob_poi, mtd->oobsize); | |
479 | ||
480 | return 0; | |
481 | } | |
44cdfc0e VZ |
482 | #else |
483 | static void lpc32xx_read_buf(struct mtd_info *mtd, uint8_t *buf, int len) | |
484 | { | |
485 | while (len-- > 0) | |
486 | *buf++ = readl(&lpc32xx_nand_slc_regs->data); | |
487 | } | |
488 | ||
489 | static void lpc32xx_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len) | |
490 | { | |
491 | while (len-- > 0) | |
492 | writel(*buf++, &lpc32xx_nand_slc_regs->data); | |
493 | } | |
5f63bf3e SL |
494 | #endif |
495 | ||
44cdfc0e VZ |
496 | static uint8_t lpc32xx_read_byte(struct mtd_info *mtd) |
497 | { | |
498 | return readl(&lpc32xx_nand_slc_regs->data); | |
499 | } | |
500 | ||
501 | static void lpc32xx_write_byte(struct mtd_info *mtd, uint8_t byte) | |
502 | { | |
503 | writel(byte, &lpc32xx_nand_slc_regs->data); | |
504 | } | |
505 | ||
dcfd37e5 VZ |
506 | /* |
507 | * LPC32xx has only one SLC NAND controller, don't utilize | |
508 | * CONFIG_SYS_NAND_SELF_INIT to be able to reuse this function | |
a187559e | 509 | * both in SPL NAND and U-Boot images. |
dcfd37e5 VZ |
510 | */ |
511 | int board_nand_init(struct nand_chip *lpc32xx_chip) | |
512 | { | |
44cdfc0e | 513 | #if defined(CONFIG_DMA_LPC32XX) && !defined(CONFIG_SPL_BUILD) |
5f63bf3e SL |
514 | int ret; |
515 | ||
516 | /* Acquire a channel for our use */ | |
517 | ret = lpc32xx_dma_get_channel(); | |
518 | if (unlikely(ret < 0)) { | |
519 | pr_info("Unable to get free DMA channel for NAND transfers\n"); | |
520 | return -1; | |
521 | } | |
522 | dmachan = (unsigned int)ret; | |
523 | #endif | |
524 | ||
dcfd37e5 VZ |
525 | lpc32xx_chip->cmd_ctrl = lpc32xx_nand_cmd_ctrl; |
526 | lpc32xx_chip->dev_ready = lpc32xx_nand_dev_ready; | |
527 | ||
5f63bf3e SL |
528 | /* |
529 | * The implementation of these functions is quite common, but | |
530 | * they MUST be defined, because access to data register | |
531 | * is strictly 32-bit aligned. | |
532 | */ | |
533 | lpc32xx_chip->read_byte = lpc32xx_read_byte; | |
534 | lpc32xx_chip->write_byte = lpc32xx_write_byte; | |
535 | ||
44cdfc0e | 536 | #if defined(CONFIG_DMA_LPC32XX) && !defined(CONFIG_SPL_BUILD) |
5f63bf3e SL |
537 | /* Hardware ECC calculation is supported when DMA driver is selected */ |
538 | lpc32xx_chip->ecc.mode = NAND_ECC_HW; | |
539 | ||
540 | lpc32xx_chip->read_buf = lpc32xx_dma_read_buf; | |
541 | lpc32xx_chip->write_buf = lpc32xx_dma_write_buf; | |
542 | ||
543 | lpc32xx_chip->ecc.calculate = lpc32xx_ecc_calculate; | |
544 | lpc32xx_chip->ecc.correct = lpc32xx_correct_data; | |
545 | lpc32xx_chip->ecc.hwctl = lpc32xx_hwecc_enable; | |
546 | lpc32xx_chip->chip_delay = 2000; | |
547 | ||
548 | lpc32xx_chip->ecc.read_page = lpc32xx_read_page_hwecc; | |
549 | lpc32xx_chip->ecc.write_page = lpc32xx_write_page_hwecc; | |
550 | lpc32xx_chip->options |= NAND_NO_SUBPAGE_WRITE; | |
551 | #else | |
dcfd37e5 VZ |
552 | /* |
553 | * Hardware ECC calculation is not supported by the driver, | |
554 | * because it requires DMA support, see LPC32x0 User Manual, | |
555 | * note after SLC_ECC register description (UM10326, p.198) | |
556 | */ | |
557 | lpc32xx_chip->ecc.mode = NAND_ECC_SOFT; | |
558 | ||
559 | /* | |
560 | * The implementation of these functions is quite common, but | |
561 | * they MUST be defined, because access to data register | |
562 | * is strictly 32-bit aligned. | |
563 | */ | |
564 | lpc32xx_chip->read_buf = lpc32xx_read_buf; | |
dcfd37e5 | 565 | lpc32xx_chip->write_buf = lpc32xx_write_buf; |
5f63bf3e | 566 | #endif |
dcfd37e5 VZ |
567 | |
568 | /* | |
30cb3bf4 | 569 | * These values are predefined |
dcfd37e5 VZ |
570 | * for both small and large page NAND flash devices. |
571 | */ | |
4e590945 TR |
572 | lpc32xx_chip->ecc.size = CFG_SYS_NAND_ECCSIZE; |
573 | lpc32xx_chip->ecc.bytes = CFG_SYS_NAND_ECCBYTES; | |
dcfd37e5 VZ |
574 | lpc32xx_chip->ecc.strength = 1; |
575 | ||
30cb3bf4 SL |
576 | if (CONFIG_SYS_NAND_PAGE_SIZE != NAND_LARGE_BLOCK_PAGE_SIZE) |
577 | lpc32xx_chip->ecc.layout = &lpc32xx_nand_oob_16; | |
578 | ||
dcfd37e5 VZ |
579 | #if defined(CONFIG_SYS_NAND_USE_FLASH_BBT) |
580 | lpc32xx_chip->bbt_options |= NAND_BBT_USE_FLASH; | |
581 | #endif | |
582 | ||
583 | /* Initialize NAND interface */ | |
584 | lpc32xx_nand_init(); | |
585 | ||
586 | return 0; | |
587 | } |