1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2008 Stefan Roese <sr@denx.de>, DENX Software Engineering
8 #include <linux/mtd/mtd.h>
9 #include <linux/mtd/onenand.h>
12 #define BURST_SIZE_WORDS 4
14 static u16 ebi_nand_read_word(void __iomem *addr)
16 reg_write(EBI_CPU_IO_ACCS(EBI_BASE), (EXT_DEVICE_CHANNEL_2 | (u32)addr));
19 return reg_read(EBI_IO_ACCS_DATA(EBI_BASE)) >> 16;
22 static void ebi_nand_write_word(u16 data, void __iomem * addr)
25 reg_write(EBI_IO_ACCS_DATA(EBI_BASE), (data << 16));
26 reg_write(EBI_CPU_IO_ACCS(EBI_BASE),
27 EXT_DEVICE_CHANNEL_2 | EBI_CPU_WRITE | (u32)addr);
32 * EBI initialization for OneNAND FLASH access
34 int ebi_init_onenand(void)
36 reg_write(EBI_DEV1_CONFIG1(EBI_BASE), 0x83000);
38 reg_write(EBI_DEV2_CONFIG1(EBI_BASE), 0x00403002);
39 reg_write(EBI_DEV2_CONFIG2(EBI_BASE), 0x50);
41 reg_write(EBI_DEV3_CONFIG1(EBI_BASE), 0x00403002);
42 reg_write(EBI_DEV3_CONFIG2(EBI_BASE), 0x0); /* byte/word ordering */
44 reg_write(EBI_DEV2_TIM1_RD1(EBI_BASE), 0x00504000);
45 reg_write(EBI_DEV2_TIM1_RD2(EBI_BASE), 0x00001000);
46 reg_write(EBI_DEV2_TIM1_WR1(EBI_BASE), 0x12002223);
47 reg_write(EBI_DEV2_TIM1_WR2(EBI_BASE), 0x3FC02220);
48 reg_write(EBI_DEV3_TIM1_RD1(EBI_BASE), 0x00504000);
49 reg_write(EBI_DEV3_TIM1_RD2(EBI_BASE), 0x00001000);
50 reg_write(EBI_DEV3_TIM1_WR1(EBI_BASE), 0x05001000);
51 reg_write(EBI_DEV3_TIM1_WR2(EBI_BASE), 0x00010200);
53 reg_write(EBI_DEV2_TIM_EXT(EBI_BASE), 0xFFF00000);
54 reg_write(EBI_DEV2_EXT_ACC(EBI_BASE), 0x0FFFFFFF);
56 reg_write(EBI_DEV3_TIM_EXT(EBI_BASE), 0xFFF00000);
57 reg_write(EBI_DEV3_EXT_ACC(EBI_BASE), 0x0FFFFFFF);
59 /* prepare DMA configuration for EBI */
60 reg_write(EBI_DEV3_FIFO_CONFIG(EBI_BASE), 0x0101ff00);
62 /* READ only no byte order change, TAG 1 used */
63 reg_write(EBI_DEV3_DMA_CONFIG2(EBI_BASE), 0x00000004);
65 reg_write(EBI_TAG1_SYS_ID(EBI_BASE), 0x0); /* SCC DMA channel 0 */
66 reg_write(EBI_TAG2_SYS_ID(EBI_BASE), 0x1);
67 reg_write(EBI_TAG3_SYS_ID(EBI_BASE), 0x2);
68 reg_write(EBI_TAG4_SYS_ID(EBI_BASE), 0x3);
73 static void *memcpy_16_from_onenand(void *dst, const void *src, unsigned int len)
81 *d++ = ebi_nand_read_word(s++);
86 static void *memcpy_32_from_onenand(void *dst, const void *src, unsigned int len)
91 u32 bytes_per_block = BURST_SIZE_WORDS * sizeof(int);
92 u32 n_blocks = len / bytes_per_block;
96 for (block = 0; block < n_blocks; block++) {
97 /* Trigger read channel 3 */
98 reg_write(EBI_CPU_IO_ACCS(EBI_BASE),
99 (EXT_DEVICE_CHANNEL_3 | (s + (block * bytes_per_block))));
100 /* Poll status to see whether read has finished */
103 /* Squirrel the data away in a safe place */
104 for (burst_word = 0; burst_word < BURST_SIZE_WORDS; burst_word++)
105 *d++ = reg_read(EBI_IO_ACCS_DATA(EBI_BASE));
111 static void *memcpy_16_to_onenand(void *dst, const void *src, unsigned int len)
119 ebi_nand_write_word(*s++, d++);
124 static inline int onenand_bufferram_offset(struct mtd_info *mtd, int area)
126 struct onenand_chip *this = mtd->priv;
128 if (ONENAND_CURRENT_BUFFERRAM(this)) {
129 if (area == ONENAND_DATARAM)
130 return mtd->writesize;
131 if (area == ONENAND_SPARERAM)
138 static int ebi_read_bufferram(struct mtd_info *mtd, loff_t addr, int area,
139 unsigned char *buffer, int offset,
142 struct onenand_chip *this = mtd->priv;
143 void __iomem *bufferram;
145 bufferram = this->base + area;
146 bufferram += onenand_bufferram_offset(mtd, area);
149 memcpy_16_from_onenand(buffer, bufferram + offset, count);
151 memcpy_32_from_onenand(buffer, bufferram + offset, count);
156 static int ebi_write_bufferram(struct mtd_info *mtd, loff_t addr, int area,
157 const unsigned char *buffer, int offset,
160 struct onenand_chip *this = mtd->priv;
161 void __iomem *bufferram;
163 bufferram = this->base + area;
164 bufferram += onenand_bufferram_offset(mtd, area);
166 memcpy_16_to_onenand(bufferram + offset, buffer, count);
171 int onenand_board_init(struct mtd_info *mtd)
173 struct onenand_chip *chip = mtd->priv;
176 * Insert board specific OneNAND access functions
178 chip->read_word = ebi_nand_read_word;
179 chip->write_word = ebi_nand_write_word;
181 chip->read_bufferram = ebi_read_bufferram;
182 chip->write_bufferram = ebi_write_bufferram;