2 * Copyright (C) 2014 Panasonic Corporation
3 * Copyright (C) 2014-2015 Masahiro Yamada <yamada.masahiro@socionext.com>
5 * SPDX-License-Identifier: GPL-2.0+
10 #include <asm/unaligned.h>
11 #include <linux/mtd/nand.h>
14 #define DENALI_MAP01 (1 << 26) /* read/write pages in PIO */
15 #define DENALI_MAP10 (2 << 26) /* high-level control plane */
17 #define INDEX_CTRL_REG 0x0
18 #define INDEX_DATA_REG 0x10
20 #define SPARE_ACCESS 0x41
21 #define MAIN_ACCESS 0x42
22 #define PIPELINE_ACCESS 0x2000
24 #define BANK(x) ((x) << 24)
26 static void __iomem *denali_flash_mem =
27 (void __iomem *)CONFIG_SYS_NAND_DATA_BASE;
28 static void __iomem *denali_flash_reg =
29 (void __iomem *)CONFIG_SYS_NAND_REGS_BASE;
31 static const int flash_bank;
32 static int page_size, oob_size, pages_per_block;
34 static void index_addr(uint32_t address, uint32_t data)
36 writel(address, denali_flash_mem + INDEX_CTRL_REG);
37 writel(data, denali_flash_mem + INDEX_DATA_REG);
40 static int wait_for_irq(uint32_t irq_mask)
42 unsigned long timeout = 1000000;
46 intr_status = readl(denali_flash_reg + INTR_STATUS(flash_bank));
48 if (intr_status & INTR__ECC_UNCOR_ERR) {
49 debug("Uncorrected ECC detected\n");
53 if (intr_status & irq_mask)
61 debug("Timeout with interrupt status %08x\n", intr_status);
68 static void read_data_from_flash_mem(uint8_t *buf, int len)
73 /* transfer the data from the flash */
74 buf32 = (uint32_t *)buf;
77 * Let's take care of unaligned access although it rarely happens.
78 * Avoid put_unaligned() for the normal use cases since it leads to
79 * a bit performance regression.
81 if ((unsigned long)buf32 % 4) {
82 for (i = 0; i < len / 4; i++)
83 put_unaligned(readl(denali_flash_mem + INDEX_DATA_REG),
86 for (i = 0; i < len / 4; i++)
87 *buf32++ = readl(denali_flash_mem + INDEX_DATA_REG);
93 tmp = cpu_to_le32(readl(denali_flash_mem + INDEX_DATA_REG));
94 buf = (uint8_t *)buf32;
95 for (i = 0; i < len % 4; i++) {
102 int denali_send_pipeline_cmd(int page, int ecc_en, int access_type)
105 static uint32_t page_count = 1;
107 writel(ecc_en, denali_flash_reg + ECC_ENABLE);
109 /* clear all bits of intr_status. */
110 writel(0xffff, denali_flash_reg + INTR_STATUS(flash_bank));
112 addr = BANK(flash_bank) | page;
114 /* setup the acccess type */
115 cmd = DENALI_MAP10 | addr;
116 index_addr(cmd, access_type);
118 /* setup the pipeline command */
119 index_addr(cmd, PIPELINE_ACCESS | page_count);
121 cmd = DENALI_MAP01 | addr;
122 writel(cmd, denali_flash_mem + INDEX_CTRL_REG);
124 return wait_for_irq(INTR__LOAD_COMP);
127 static int nand_read_oob(void *buf, int page)
131 ret = denali_send_pipeline_cmd(page, 0, SPARE_ACCESS);
135 read_data_from_flash_mem(buf, oob_size);
140 static int nand_read_page(void *buf, int page)
144 ret = denali_send_pipeline_cmd(page, 1, MAIN_ACCESS);
148 read_data_from_flash_mem(buf, page_size);
153 static int nand_block_isbad(void *buf, int block)
157 ret = nand_read_oob(buf, block * pages_per_block);
161 return *((uint8_t *)buf + CONFIG_SYS_NAND_BAD_BLOCK_POS) != 0xff;
164 /* nand_init() - initialize data to make nand usable by SPL */
167 /* access to main area */
168 writel(0, denali_flash_reg + TRANSFER_SPARE_REG);
171 * These registers are expected to be already set by the hardware
172 * or earlier boot code. So we read these values out.
174 page_size = readl(denali_flash_reg + DEVICE_MAIN_AREA_SIZE);
175 oob_size = readl(denali_flash_reg + DEVICE_SPARE_AREA_SIZE);
176 pages_per_block = readl(denali_flash_reg + PAGES_PER_BLOCK);
179 int nand_spl_load_image(uint32_t offs, unsigned int size, void *dst)
181 int block, page, column, readlen;
183 int force_bad_block_check = 1;
185 page = offs / page_size;
186 column = offs % page_size;
188 block = page / pages_per_block;
189 page = page % pages_per_block;
192 if (force_bad_block_check || page == 0) {
193 ret = nand_block_isbad(dst, block);
203 force_bad_block_check = 0;
205 ret = nand_read_page(dst, block * pages_per_block + page);
209 readlen = min(page_size - column, (int)size);
211 if (unlikely(column)) {
212 /* Partial page read */
213 memmove(dst, dst + column, readlen);
220 if (page == pages_per_block) {
229 void nand_deselect(void) {}