2 * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
4 * SPDX-License-Identifier: GPL-2.0+
13 #define BUS_WIDTH 8 /* AXI data bus width in bytes */
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
21 #define BD_STAT_BD_COMPLETE (BD_STAT_BD_FIRST | BD_STAT_BD_LAST)
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 */
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 */
35 NAND_ISR_DATAREQUIRED = 0,
38 NAND_ISR_DATAAVAILABLE,
41 NAND_ISR_TXDMACOMPLETE,
42 NAND_ISR_RXDMACOMPLETE,
43 NAND_ISR_DESCRIPTORUNAVAILABLE,
45 NAND_ISR_CMDAVAILABLE,
47 NAND_ISR_DATATRANSFEROVER,
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 */
59 uint32_t status; /* DES0 */
60 uint32_t sizes; /* DES1 */
61 uint32_t buffer_ptr0; /* DES2 */
62 uint32_t buffer_ptr1; /* DES3 */
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)
68 static struct nand_bd *bd; /* DMA buffer descriptors */
71 * axs101_nand_write_buf - write buffer to chip
72 * @mtd: MTD device structure
74 * @len: number of bytes to write
76 static uint32_t nand_flag_is_set(uint32_t flag)
78 uint32_t reg = NAND_REG_READ(INT_STATUS);
80 if (reg & (1 << NAND_ISR_CMDERROR))
83 if (reg & (1 << flag)) {
84 NAND_REG_WRITE(INT_CLR_STATUS, 1 << flag);
92 * axs101_nand_write_buf - write buffer to chip
93 * @mtd: MTD device structure
95 * @len: number of bytes to write
97 static void axs101_nand_write_buf(struct mtd_info *mtd, const u_char *buf,
100 struct bounce_buffer bbstate;
102 bounce_buffer_start(&bbstate, (void *)buf, len, GEN_BB_READ);
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);
110 /* Flush modified buffer descriptor */
111 flush_dcache_range((unsigned long)bd,
112 (unsigned long)bd + sizeof(struct nand_bd));
114 /* Issue "write" command */
115 NAND_REG_WRITE(AC_FIFO, B_CT_WRITE | B_WFR | B_IWC | B_LC | (len-1));
117 /* Wait for NAND command and DMA to complete */
118 while (!nand_flag_is_set(NAND_ISR_CMDDONE))
120 while (!nand_flag_is_set(NAND_ISR_TXDMACOMPLETE))
123 bounce_buffer_stop(&bbstate);
127 * axs101_nand_read_buf - read chip data into buffer
128 * @mtd: MTD device structure
129 * @buf: buffer to store data
130 * @len: number of bytes to read
132 static void axs101_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
134 struct bounce_buffer bbstate;
136 bounce_buffer_start(&bbstate, buf, len, GEN_BB_WRITE);
138 /* Setup buffer descriptor */
139 writel(BD_STAT_OWN | BD_STAT_BD_COMPLETE, &bd->status);
140 writel(ALIGN(len, BUS_WIDTH) & BD_SIZES_BUFFER1_MASK, &bd->sizes);
141 writel(bbstate.bounce_buffer, &bd->buffer_ptr0);
142 writel(0, &bd->buffer_ptr1);
144 /* Flush modified buffer descriptor */
145 flush_dcache_range((unsigned long)bd,
146 (unsigned long)bd + sizeof(struct nand_bd));
148 /* Issue "read" command */
149 NAND_REG_WRITE(AC_FIFO, B_CT_READ | B_WFR | B_IWC | B_LC | (len - 1));
151 /* Wait for NAND command and DMA to complete */
152 while (!nand_flag_is_set(NAND_ISR_CMDDONE))
154 while (!nand_flag_is_set(NAND_ISR_RXDMACOMPLETE))
157 bounce_buffer_stop(&bbstate);
161 * axs101_nand_read_byte - read one byte from the chip
162 * @mtd: MTD device structure
164 static u_char axs101_nand_read_byte(struct mtd_info *mtd)
168 axs101_nand_read_buf(mtd, (uchar *)&byte, sizeof(byte));
173 * axs101_nand_read_word - read one word from the chip
174 * @mtd: MTD device structure
176 static u16 axs101_nand_read_word(struct mtd_info *mtd)
180 axs101_nand_read_buf(mtd, (uchar *)&word, sizeof(word));
185 * axs101_nand_hwcontrol - NAND control functions wrapper.
186 * @mtd: MTD device structure
189 static void axs101_nand_hwcontrol(struct mtd_info *mtdinfo, int cmd,
192 if (cmd == NAND_CMD_NONE)
197 switch (ctrl & (NAND_ALE | NAND_CLE)) {
205 cmd |= B_CT_COMMAND | B_WFR;
210 debug("%s: unknown ctrl %#x\n", __func__, ctrl);
213 NAND_REG_WRITE(AC_FIFO, cmd | B_LC);
214 while (!nand_flag_is_set(NAND_ISR_CMDDONE))
218 int board_nand_init(struct nand_chip *nand)
220 bd = (struct nand_bd *)memalign(ARCH_DMA_MINALIGN,
221 sizeof(struct nand_bd));
223 /* Set buffer descriptor address in IDMAC */
224 NAND_REG_WRITE(IDMAC_BDADDR, bd);
226 nand->ecc.mode = NAND_ECC_SOFT;
227 nand->cmd_ctrl = axs101_nand_hwcontrol;
228 nand->read_byte = axs101_nand_read_byte;
229 nand->read_word = axs101_nand_read_word;
230 nand->write_buf = axs101_nand_write_buf;
231 nand->read_buf = axs101_nand_read_buf;