2 * Copyright (c) 2014-2015, Antmicro Ltd <www.antmicro.com>
3 * Copyright (c) 2015, AW-SOM Technologies <www.aw-som.com>
5 * SPDX-License-Identifier: GPL-2.0+
8 #include <asm/arch/clock.h>
15 #define NFC_CTL 0x00000000
16 #define NFC_ST 0x00000004
17 #define NFC_INT 0x00000008
18 #define NFC_TIMING_CTL 0x0000000C
19 #define NFC_TIMING_CFG 0x00000010
20 #define NFC_ADDR_LOW 0x00000014
21 #define NFC_ADDR_HIGH 0x00000018
22 #define NFC_SECTOR_NUM 0x0000001C
23 #define NFC_CNT 0x00000020
24 #define NFC_CMD 0x00000024
25 #define NFC_RCMD_SET 0x00000028
26 #define NFC_WCMD_SET 0x0000002C
27 #define NFC_IO_DATA 0x00000030
28 #define NFC_ECC_CTL 0x00000034
29 #define NFC_ECC_ST 0x00000038
30 #define NFC_DEBUG 0x0000003C
31 #define NFC_ECC_CNT0 0x00000040
32 #define NFC_ECC_CNT1 0x00000044
33 #define NFC_ECC_CNT2 0x00000048
34 #define NFC_ECC_CNT3 0x0000004C
35 #define NFC_USER_DATA_BASE 0x00000050
36 #define NFC_EFNAND_STATUS 0x00000090
37 #define NFC_SPARE_AREA 0x000000A0
38 #define NFC_PATTERN_ID 0x000000A4
39 #define NFC_RAM0_BASE 0x00000400
40 #define NFC_RAM1_BASE 0x00000800
42 #define NFC_CTL_EN (1 << 0)
43 #define NFC_CTL_RESET (1 << 1)
44 #define NFC_CTL_RAM_METHOD (1 << 14)
45 #define NFC_CTL_PAGE_SIZE_MASK (0xf << 8)
46 #define NFC_CTL_PAGE_SIZE(a) ((fls(a) - 11) << 8)
49 #define NFC_ECC_EN (1 << 0)
50 #define NFC_ECC_PIPELINE (1 << 3)
51 #define NFC_ECC_EXCEPTION (1 << 4)
52 #define NFC_ECC_BLOCK_SIZE (1 << 5)
53 #define NFC_ECC_RANDOM_EN (1 << 9)
54 #define NFC_ECC_RANDOM_DIRECTION (1 << 10)
57 #define NFC_ADDR_NUM_OFFSET 16
58 #define NFC_SEND_ADR (1 << 19)
59 #define NFC_ACCESS_DIR (1 << 20)
60 #define NFC_DATA_TRANS (1 << 21)
61 #define NFC_SEND_CMD1 (1 << 22)
62 #define NFC_WAIT_FLAG (1 << 23)
63 #define NFC_SEND_CMD2 (1 << 24)
64 #define NFC_SEQ (1 << 25)
65 #define NFC_DATA_SWAP_METHOD (1 << 26)
66 #define NFC_ROW_AUTO_INC (1 << 27)
67 #define NFC_SEND_CMD3 (1 << 28)
68 #define NFC_SEND_CMD4 (1 << 29)
70 #define NFC_ST_CMD_INT_FLAG (1 << 1)
71 #define NFC_ST_DMA_INT_FLAG (1 << 2)
73 #define NFC_READ_CMD_OFFSET 0
74 #define NFC_RANDOM_READ_CMD0_OFFSET 8
75 #define NFC_RANDOM_READ_CMD1_OFFSET 16
77 #define NFC_CMD_RNDOUTSTART 0xE0
78 #define NFC_CMD_RNDOUT 0x05
79 #define NFC_CMD_READSTART 0x30
82 #define NFC_PAGE_CMD (2 << 30)
84 #define SUNXI_DMA_CFG_REG0 0x300
85 #define SUNXI_DMA_SRC_START_ADDR_REG0 0x304
86 #define SUNXI_DMA_DEST_START_ADDRR_REG0 0x308
87 #define SUNXI_DMA_DDMA_BC_REG0 0x30C
88 #define SUNXI_DMA_DDMA_PARA_REG0 0x318
90 #define SUNXI_DMA_DDMA_CFG_REG_LOADING (1 << 31)
91 #define SUNXI_DMA_DDMA_CFG_REG_DMA_DEST_DATA_WIDTH_32 (2 << 25)
92 #define SUNXI_DMA_DDMA_CFG_REG_DDMA_DST_DRQ_TYPE_DRAM (1 << 16)
93 #define SUNXI_DMA_DDMA_CFG_REG_DMA_SRC_DATA_WIDTH_32 (2 << 9)
94 #define SUNXI_DMA_DDMA_CFG_REG_DMA_SRC_ADDR_MODE_IO (1 << 5)
95 #define SUNXI_DMA_DDMA_CFG_REG_DDMA_SRC_DRQ_TYPE_NFC (3 << 0)
97 #define SUNXI_DMA_DDMA_PARA_REG_SRC_WAIT_CYC (0x0F << 0)
98 #define SUNXI_DMA_DDMA_PARA_REG_SRC_BLK_SIZE (0x7F << 8)
100 /* minimal "boot0" style NAND support for Allwinner A20 */
102 /* random seed used by linux */
103 const uint16_t random_seed[128] = {
104 0x2b75, 0x0bd0, 0x5ca3, 0x62d1, 0x1c93, 0x07e9, 0x2162, 0x3a72,
105 0x0d67, 0x67f9, 0x1be7, 0x077d, 0x032f, 0x0dac, 0x2716, 0x2436,
106 0x7922, 0x1510, 0x3860, 0x5287, 0x480f, 0x4252, 0x1789, 0x5a2d,
107 0x2a49, 0x5e10, 0x437f, 0x4b4e, 0x2f45, 0x216e, 0x5cb7, 0x7130,
108 0x2a3f, 0x60e4, 0x4dc9, 0x0ef0, 0x0f52, 0x1bb9, 0x6211, 0x7a56,
109 0x226d, 0x4ea7, 0x6f36, 0x3692, 0x38bf, 0x0c62, 0x05eb, 0x4c55,
110 0x60f4, 0x728c, 0x3b6f, 0x2037, 0x7f69, 0x0936, 0x651a, 0x4ceb,
111 0x6218, 0x79f3, 0x383f, 0x18d9, 0x4f05, 0x5c82, 0x2912, 0x6f17,
112 0x6856, 0x5938, 0x1007, 0x61ab, 0x3e7f, 0x57c2, 0x542f, 0x4f62,
113 0x7454, 0x2eac, 0x7739, 0x42d4, 0x2f90, 0x435a, 0x2e52, 0x2064,
114 0x637c, 0x66ad, 0x2c90, 0x0bad, 0x759c, 0x0029, 0x0986, 0x7126,
115 0x1ca7, 0x1605, 0x386a, 0x27f5, 0x1380, 0x6d75, 0x24c3, 0x0f8e,
116 0x2b7a, 0x1418, 0x1fd1, 0x7dc1, 0x2d8e, 0x43af, 0x2267, 0x7da3,
117 0x4e3d, 0x1338, 0x50db, 0x454d, 0x764d, 0x40a3, 0x42e6, 0x262b,
118 0x2d2e, 0x1aea, 0x2e17, 0x173d, 0x3a6e, 0x71bf, 0x25f9, 0x0a5d,
119 0x7c57, 0x0fbe, 0x46ce, 0x4939, 0x6b17, 0x37bb, 0x3e91, 0x76db,
122 #define MAX_RETRIES 10
124 static int check_value_inner(int offset, int expected_bits,
125 int max_number_of_retries, int negation)
129 int val = readl(offset) & expected_bits;
130 if (negation ? !val : val)
134 } while (retries < max_number_of_retries);
139 static inline int check_value(int offset, int expected_bits,
140 int max_number_of_retries)
142 return check_value_inner(offset, expected_bits,
143 max_number_of_retries, 0);
146 static inline int check_value_negated(int offset, int unexpected_bits,
147 int max_number_of_retries)
149 return check_value_inner(offset, unexpected_bits,
150 max_number_of_retries, 1);
159 val = readl(SUNXI_NFC_BASE + NFC_CTL);
160 /* enable and reset CTL */
161 writel(val | NFC_CTL_EN | NFC_CTL_RESET,
162 SUNXI_NFC_BASE + NFC_CTL);
164 if (!check_value_negated(SUNXI_NFC_BASE + NFC_CTL,
165 NFC_CTL_RESET, MAX_RETRIES)) {
166 printf("Couldn't initialize nand\n");
170 writel(NFC_ST_CMD_INT_FLAG, SUNXI_NFC_BASE + NFC_ST);
171 writel(NFC_SEND_CMD1 | NFC_WAIT_FLAG | NAND_CMD_RESET,
172 SUNXI_NFC_BASE + NFC_CMD);
174 if (!check_value(SUNXI_NFC_BASE + NFC_ST, NFC_ST_CMD_INT_FLAG,
176 printf("Error timeout waiting for nand reset\n");
179 writel(NFC_ST_CMD_INT_FLAG, SUNXI_NFC_BASE + NFC_ST);
182 static int nand_read_page(int page_size, int ecc_strength, int ecc_page_size,
183 int addr_cycles, uint32_t real_addr, dma_addr_t dst)
187 uint16_t ecc_mode = 0;
191 static const u8 strengths[] = { 16, 24, 28, 32, 40, 48, 56, 60, 64 };
193 for (i = 0; i < ARRAY_SIZE(strengths); i++) {
194 if (ecc_strength == strengths[i]) {
200 /* HW ECC always request ECC bytes for 1024 bytes blocks */
201 ecc_off = DIV_ROUND_UP(ecc_strength * fls(8 * 1024), 8);
202 /* HW ECC always work with even numbers of ECC bytes */
203 ecc_off += (ecc_off & 1);
204 ecc_off += 4; /* prepad */
206 page = real_addr / page_size;
207 column = real_addr % page_size;
209 /* clear ecc status */
210 writel(0, SUNXI_NFC_BASE + NFC_ECC_ST);
212 /* Choose correct seed */
213 rand_seed = random_seed[page % 128];
215 writel((rand_seed << 16) | NFC_ECC_RANDOM_EN | NFC_ECC_EN
216 | NFC_ECC_PIPELINE | (ecc_mode << 12),
217 SUNXI_NFC_BASE + NFC_ECC_CTL);
219 val = readl(SUNXI_NFC_BASE + NFC_CTL);
220 writel(val | NFC_CTL_RAM_METHOD, SUNXI_NFC_BASE + NFC_CTL);
222 writel(page_size + (column / ecc_page_size) * ecc_off,
223 SUNXI_NFC_BASE + NFC_SPARE_AREA);
225 flush_dcache_range(dst, ALIGN(dst + ecc_page_size, ARCH_DMA_MINALIGN));
228 writel(0x0, SUNXI_DMA_BASE + SUNXI_DMA_CFG_REG0); /* clr dma cmd */
229 /* read from REG_IO_DATA */
230 writel(SUNXI_NFC_BASE + NFC_IO_DATA,
231 SUNXI_DMA_BASE + SUNXI_DMA_SRC_START_ADDR_REG0);
233 writel(dst, SUNXI_DMA_BASE + SUNXI_DMA_DEST_START_ADDRR_REG0);
234 writel(SUNXI_DMA_DDMA_PARA_REG_SRC_WAIT_CYC
235 | SUNXI_DMA_DDMA_PARA_REG_SRC_BLK_SIZE,
236 SUNXI_DMA_BASE + SUNXI_DMA_DDMA_PARA_REG0);
237 writel(ecc_page_size,
238 SUNXI_DMA_BASE + SUNXI_DMA_DDMA_BC_REG0); /* 1kB */
239 writel(SUNXI_DMA_DDMA_CFG_REG_LOADING
240 | SUNXI_DMA_DDMA_CFG_REG_DMA_DEST_DATA_WIDTH_32
241 | SUNXI_DMA_DDMA_CFG_REG_DDMA_DST_DRQ_TYPE_DRAM
242 | SUNXI_DMA_DDMA_CFG_REG_DMA_SRC_DATA_WIDTH_32
243 | SUNXI_DMA_DDMA_CFG_REG_DMA_SRC_ADDR_MODE_IO
244 | SUNXI_DMA_DDMA_CFG_REG_DDMA_SRC_DRQ_TYPE_NFC,
245 SUNXI_DMA_BASE + SUNXI_DMA_CFG_REG0);
247 writel((NFC_CMD_RNDOUTSTART << NFC_RANDOM_READ_CMD1_OFFSET)
248 | (NFC_CMD_RNDOUT << NFC_RANDOM_READ_CMD0_OFFSET)
249 | (NFC_CMD_READSTART | NFC_READ_CMD_OFFSET), SUNXI_NFC_BASE
251 writel(1, SUNXI_NFC_BASE + NFC_SECTOR_NUM);
252 writel(((page & 0xFFFF) << 16) | column,
253 SUNXI_NFC_BASE + NFC_ADDR_LOW);
254 writel((page >> 16) & 0xFF, SUNXI_NFC_BASE + NFC_ADDR_HIGH);
255 writel(NFC_ST_DMA_INT_FLAG, SUNXI_NFC_BASE + NFC_ST);
256 writel(NFC_SEND_CMD1 | NFC_SEND_CMD2 | NFC_DATA_TRANS |
257 NFC_PAGE_CMD | NFC_WAIT_FLAG |
258 ((addr_cycles - 1) << NFC_ADDR_NUM_OFFSET) |
259 NFC_SEND_ADR | NFC_DATA_SWAP_METHOD,
260 SUNXI_NFC_BASE + NFC_CMD);
262 if (!check_value(SUNXI_NFC_BASE + NFC_ST, NFC_ST_DMA_INT_FLAG,
264 printf("Error while initializing dma interrupt\n");
267 writel(NFC_ST_DMA_INT_FLAG, SUNXI_NFC_BASE + NFC_ST);
269 if (!check_value_negated(SUNXI_DMA_BASE + SUNXI_DMA_CFG_REG0,
270 SUNXI_DMA_DDMA_CFG_REG_LOADING, MAX_RETRIES)) {
271 printf("Error while waiting for dma transfer to finish\n");
275 invalidate_dcache_range(dst,
276 ALIGN(dst + ecc_page_size, ARCH_DMA_MINALIGN));
278 if (readl(SUNXI_NFC_BASE + NFC_ECC_ST))
284 static int nand_read_ecc(int page_size, int ecc_strength, int ecc_page_size,
285 int addr_cycles, uint32_t offs, uint32_t size, void *dest)
287 void *end = dest + size;
289 clrsetbits_le32(SUNXI_NFC_BASE + NFC_CTL, NFC_CTL_PAGE_SIZE_MASK,
290 NFC_CTL_PAGE_SIZE(page_size));
292 for ( ;dest < end; dest += ecc_page_size, offs += ecc_page_size) {
293 if (nand_read_page(page_size, ecc_strength, ecc_page_size,
294 addr_cycles, offs, (dma_addr_t)dest))
301 static int nand_read_buffer(uint32_t offs, unsigned int size, void *dest)
309 { 8192, 40, 1024, 5 },
310 { 16384, 56, 1024, 5 },
311 { 8192, 24, 1024, 5 },
312 { 4096, 24, 1024, 5 },
314 static int nand_config = -1;
317 if (nand_config == -1) {
318 for (i = 0; i < ARRAY_SIZE(nand_configs); i++) {
319 debug("nand: trying page %d ecc %d / %d addr %d: ",
320 nand_configs[i].page_size,
321 nand_configs[i].ecc_strength,
322 nand_configs[i].ecc_page_size,
323 nand_configs[i].addr_cycles);
324 if (nand_read_ecc(nand_configs[i].page_size,
325 nand_configs[i].ecc_strength,
326 nand_configs[i].ecc_page_size,
327 nand_configs[i].addr_cycles,
328 offs, size, dest) == 0) {
338 return nand_read_ecc(nand_configs[nand_config].page_size,
339 nand_configs[nand_config].ecc_strength,
340 nand_configs[nand_config].ecc_page_size,
341 nand_configs[nand_config].addr_cycles,
345 int nand_spl_load_image(uint32_t offs, unsigned int size, void *dest)
347 return nand_read_buffer(offs, size, dest);
350 void nand_deselect(void)
352 struct sunxi_ccm_reg *const ccm =
353 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
355 clrbits_le32(&ccm->ahb_gate0, (CLK_GATE_OPEN << AHB_GATE_OFFSET_NAND0));
356 #ifdef CONFIG_MACH_SUN9I
357 clrbits_le32(&ccm->ahb_gate1, (1 << AHB_GATE_OFFSET_DMA));
359 clrbits_le32(&ccm->ahb_gate0, (1 << AHB_GATE_OFFSET_DMA));
361 clrbits_le32(&ccm->nand0_clk_cfg, CCM_NAND_CTRL_ENABLE | AHB_DIV_1);