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 /* Issue "write" command */
111 NAND_REG_WRITE(AC_FIFO
, B_CT_WRITE
| B_WFR
| B_IWC
| B_LC
| (len
-1));
113 /* Wait for NAND command and DMA to complete */
114 while (!nand_flag_is_set(NAND_ISR_CMDDONE
))
116 while (!nand_flag_is_set(NAND_ISR_TXDMACOMPLETE
))
119 bounce_buffer_stop(&bbstate
);
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
128 static void axs101_nand_read_buf(struct mtd_info
*mtd
, u_char
*buf
, int len
)
130 struct bounce_buffer bbstate
;
132 bounce_buffer_start(&bbstate
, buf
, len
, GEN_BB_WRITE
);
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
);
140 /* Issue "read" command */
141 NAND_REG_WRITE(AC_FIFO
, B_CT_READ
| B_WFR
| B_IWC
| B_LC
| (len
- 1));
143 /* Wait for NAND command and DMA to complete */
144 while (!nand_flag_is_set(NAND_ISR_CMDDONE
))
146 while (!nand_flag_is_set(NAND_ISR_RXDMACOMPLETE
))
149 bounce_buffer_stop(&bbstate
);
153 * axs101_nand_read_byte - read one byte from the chip
154 * @mtd: MTD device structure
156 static u_char
axs101_nand_read_byte(struct mtd_info
*mtd
)
160 axs101_nand_read_buf(mtd
, (uchar
*)&byte
, sizeof(byte
));
165 * axs101_nand_read_word - read one word from the chip
166 * @mtd: MTD device structure
168 static u16
axs101_nand_read_word(struct mtd_info
*mtd
)
172 axs101_nand_read_buf(mtd
, (uchar
*)&word
, sizeof(word
));
177 * axs101_nand_hwcontrol - NAND control functions wrapper.
178 * @mtd: MTD device structure
181 static void axs101_nand_hwcontrol(struct mtd_info
*mtdinfo
, int cmd
,
184 if (cmd
== NAND_CMD_NONE
)
189 switch (ctrl
& (NAND_ALE
| NAND_CLE
)) {
197 cmd
|= B_CT_COMMAND
| B_WFR
;
202 debug("%s: unknown ctrl %#x\n", __func__
, ctrl
);
205 NAND_REG_WRITE(AC_FIFO
, cmd
| B_LC
);
206 while (!nand_flag_is_set(NAND_ISR_CMDDONE
))
210 int board_nand_init(struct nand_chip
*nand
)
212 bd
= (struct nand_bd
*)memalign(ARCH_DMA_MINALIGN
,
213 sizeof(struct nand_bd
));
215 /* Set buffer descriptor address in IDMAC */
216 NAND_REG_WRITE(IDMAC_BDADDR
, bd
);
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
;