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a7069ddf AB |
1 | /* |
2 | * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved. | |
3 | * | |
4 | * SPDX-License-Identifier: GPL-2.0+ | |
5 | */ | |
6 | ||
7 | #include <bouncebuf.h> | |
8 | #include <common.h> | |
9 | #include <malloc.h> | |
10 | #include <nand.h> | |
11 | #include <asm/io.h> | |
12 | ||
13 | #define BUS_WIDTH 8 /* AXI data bus width in bytes */ | |
14 | ||
15 | /* DMA buffer descriptor bits & masks */ | |
16 | #define BD_STAT_OWN (1 << 31) | |
17 | #define BD_STAT_BD_FIRST (1 << 3) | |
18 | #define BD_STAT_BD_LAST (1 << 2) | |
19 | #define BD_SIZES_BUFFER1_MASK 0xfff | |
20 | ||
21 | #define BD_STAT_BD_COMPLETE (BD_STAT_BD_FIRST | BD_STAT_BD_LAST) | |
22 | ||
23 | /* Controller command flags */ | |
24 | #define B_WFR (1 << 19) /* 1b - Wait for ready */ | |
25 | #define B_LC (1 << 18) /* 1b - Last cycle */ | |
26 | #define B_IWC (1 << 13) /* 1b - Interrupt when complete */ | |
27 | ||
28 | /* NAND cycle types */ | |
29 | #define B_CT_ADDRESS (0x0 << 16) /* Address operation */ | |
30 | #define B_CT_COMMAND (0x1 << 16) /* Command operation */ | |
31 | #define B_CT_WRITE (0x2 << 16) /* Write operation */ | |
32 | #define B_CT_READ (0x3 << 16) /* Write operation */ | |
33 | ||
34 | enum nand_isr_t { | |
35 | NAND_ISR_DATAREQUIRED = 0, | |
36 | NAND_ISR_TXUNDERFLOW, | |
37 | NAND_ISR_TXOVERFLOW, | |
38 | NAND_ISR_DATAAVAILABLE, | |
39 | NAND_ISR_RXUNDERFLOW, | |
40 | NAND_ISR_RXOVERFLOW, | |
41 | NAND_ISR_TXDMACOMPLETE, | |
42 | NAND_ISR_RXDMACOMPLETE, | |
43 | NAND_ISR_DESCRIPTORUNAVAILABLE, | |
44 | NAND_ISR_CMDDONE, | |
45 | NAND_ISR_CMDAVAILABLE, | |
46 | NAND_ISR_CMDERROR, | |
47 | NAND_ISR_DATATRANSFEROVER, | |
48 | NAND_ISR_NONE | |
49 | }; | |
50 | ||
51 | enum nand_regs_t { | |
52 | AC_FIFO = 0, /* address and command fifo */ | |
53 | IDMAC_BDADDR = 0x18, /* idmac descriptor list base address */ | |
54 | INT_STATUS = 0x118, /* interrupt status register */ | |
55 | INT_CLR_STATUS = 0x120, /* interrupt clear status register */ | |
56 | }; | |
57 | ||
58 | struct nand_bd { | |
59 | uint32_t status; /* DES0 */ | |
60 | uint32_t sizes; /* DES1 */ | |
61 | uint32_t buffer_ptr0; /* DES2 */ | |
62 | uint32_t buffer_ptr1; /* DES3 */ | |
63 | }; | |
64 | ||
65 | #define NAND_REG_WRITE(r, v) writel(v, CONFIG_SYS_NAND_BASE + r) | |
66 | #define NAND_REG_READ(r) readl(CONFIG_SYS_NAND_BASE + r) | |
67 | ||
68 | static struct nand_bd *bd; /* DMA buffer descriptors */ | |
69 | ||
70 | /** | |
71 | * axs101_nand_write_buf - write buffer to chip | |
72 | * @mtd: MTD device structure | |
73 | * @buf: data buffer | |
74 | * @len: number of bytes to write | |
75 | */ | |
76 | static uint32_t nand_flag_is_set(uint32_t flag) | |
77 | { | |
78 | uint32_t reg = NAND_REG_READ(INT_STATUS); | |
79 | ||
80 | if (reg & (1 << NAND_ISR_CMDERROR)) | |
81 | return 0; | |
82 | ||
83 | if (reg & (1 << flag)) { | |
84 | NAND_REG_WRITE(INT_CLR_STATUS, 1 << flag); | |
85 | return 1; | |
86 | } | |
87 | ||
88 | return 0; | |
89 | } | |
90 | ||
91 | /** | |
92 | * axs101_nand_write_buf - write buffer to chip | |
93 | * @mtd: MTD device structure | |
94 | * @buf: data buffer | |
95 | * @len: number of bytes to write | |
96 | */ | |
97 | static void axs101_nand_write_buf(struct mtd_info *mtd, const u_char *buf, | |
98 | int len) | |
99 | { | |
100 | struct bounce_buffer bbstate; | |
101 | ||
102 | bounce_buffer_start(&bbstate, (void *)buf, len, GEN_BB_READ); | |
103 | ||
104 | /* Setup buffer descriptor */ | |
105 | writel(BD_STAT_OWN | BD_STAT_BD_COMPLETE, &bd->status); | |
106 | writel(ALIGN(len, BUS_WIDTH) & BD_SIZES_BUFFER1_MASK, &bd->sizes); | |
107 | writel(bbstate.bounce_buffer, &bd->buffer_ptr0); | |
108 | writel(0, &bd->buffer_ptr1); | |
109 | ||
110 | /* Issue "write" command */ | |
111 | NAND_REG_WRITE(AC_FIFO, B_CT_WRITE | B_WFR | B_IWC | B_LC | (len-1)); | |
112 | ||
113 | /* Wait for NAND command and DMA to complete */ | |
114 | while (!nand_flag_is_set(NAND_ISR_CMDDONE)) | |
115 | ; | |
116 | while (!nand_flag_is_set(NAND_ISR_TXDMACOMPLETE)) | |
117 | ; | |
118 | ||
119 | bounce_buffer_stop(&bbstate); | |
120 | } | |
121 | ||
122 | /** | |
123 | * axs101_nand_read_buf - read chip data into buffer | |
124 | * @mtd: MTD device structure | |
125 | * @buf: buffer to store data | |
126 | * @len: number of bytes to read | |
127 | */ | |
128 | static void axs101_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len) | |
129 | { | |
130 | struct bounce_buffer bbstate; | |
131 | ||
132 | bounce_buffer_start(&bbstate, buf, len, GEN_BB_WRITE); | |
133 | ||
134 | /* Setup buffer descriptor */ | |
135 | writel(BD_STAT_OWN | BD_STAT_BD_COMPLETE, &bd->status); | |
136 | writel(ALIGN(len, BUS_WIDTH) & BD_SIZES_BUFFER1_MASK, &bd->sizes); | |
137 | writel(bbstate.bounce_buffer, &bd->buffer_ptr0); | |
138 | writel(0, &bd->buffer_ptr1); | |
139 | ||
140 | /* Issue "read" command */ | |
141 | NAND_REG_WRITE(AC_FIFO, B_CT_READ | B_WFR | B_IWC | B_LC | (len - 1)); | |
142 | ||
143 | /* Wait for NAND command and DMA to complete */ | |
144 | while (!nand_flag_is_set(NAND_ISR_CMDDONE)) | |
145 | ; | |
146 | while (!nand_flag_is_set(NAND_ISR_RXDMACOMPLETE)) | |
147 | ; | |
148 | ||
149 | bounce_buffer_stop(&bbstate); | |
150 | } | |
151 | ||
152 | /** | |
153 | * axs101_nand_read_byte - read one byte from the chip | |
154 | * @mtd: MTD device structure | |
155 | */ | |
156 | static u_char axs101_nand_read_byte(struct mtd_info *mtd) | |
157 | { | |
158 | u8 byte; | |
159 | ||
160 | axs101_nand_read_buf(mtd, (uchar *)&byte, sizeof(byte)); | |
161 | return byte; | |
162 | } | |
163 | ||
164 | /** | |
165 | * axs101_nand_read_word - read one word from the chip | |
166 | * @mtd: MTD device structure | |
167 | */ | |
168 | static u16 axs101_nand_read_word(struct mtd_info *mtd) | |
169 | { | |
170 | u16 word; | |
171 | ||
172 | axs101_nand_read_buf(mtd, (uchar *)&word, sizeof(word)); | |
173 | return word; | |
174 | } | |
175 | ||
176 | /** | |
177 | * axs101_nand_hwcontrol - NAND control functions wrapper. | |
178 | * @mtd: MTD device structure | |
179 | * @cmd: Command | |
180 | */ | |
181 | static void axs101_nand_hwcontrol(struct mtd_info *mtdinfo, int cmd, | |
182 | unsigned int ctrl) | |
183 | { | |
184 | if (cmd == NAND_CMD_NONE) | |
185 | return; | |
186 | ||
187 | cmd = cmd & 0xff; | |
188 | ||
189 | switch (ctrl & (NAND_ALE | NAND_CLE)) { | |
190 | /* Address */ | |
191 | case NAND_ALE: | |
192 | cmd |= B_CT_ADDRESS; | |
193 | break; | |
194 | ||
195 | /* Command */ | |
196 | case NAND_CLE: | |
197 | cmd |= B_CT_COMMAND | B_WFR; | |
198 | ||
199 | break; | |
200 | ||
201 | default: | |
202 | debug("%s: unknown ctrl %#x\n", __func__, ctrl); | |
203 | } | |
204 | ||
205 | NAND_REG_WRITE(AC_FIFO, cmd | B_LC); | |
206 | while (!nand_flag_is_set(NAND_ISR_CMDDONE)) | |
207 | ; | |
208 | } | |
209 | ||
210 | int board_nand_init(struct nand_chip *nand) | |
211 | { | |
212 | bd = (struct nand_bd *)memalign(ARCH_DMA_MINALIGN, | |
213 | sizeof(struct nand_bd)); | |
214 | ||
215 | /* Set buffer descriptor address in IDMAC */ | |
216 | NAND_REG_WRITE(IDMAC_BDADDR, bd); | |
217 | ||
218 | nand->ecc.mode = NAND_ECC_SOFT; | |
219 | nand->cmd_ctrl = axs101_nand_hwcontrol; | |
220 | nand->read_byte = axs101_nand_read_byte; | |
221 | nand->read_word = axs101_nand_read_word; | |
222 | nand->write_buf = axs101_nand_write_buf; | |
223 | nand->read_buf = axs101_nand_read_buf; | |
224 | ||
225 | return 0; | |
226 | } |