1 /* 2 * SPI flash probing 3 * 4 * Copyright (C) 2008 Atmel Corporation 5 * Copyright (C) 2010 Reinhard Meyer, EMK Elektronik 6 * Copyright (C) 2013 Jagannadha Sutradharudu Teki, Xilinx Inc. 7 * 8 * SPDX-License-Identifier: GPL-2.0+ 9 */ 10 11 #include <common.h> 12 #include <blk.h> 13 #include <dm.h> 14 #include <errno.h> 15 #include <malloc.h> 16 #include <spi.h> 17 #include <spi_flash.h> 18 19 #include "sf_internal.h" 20 21 /** 22 * spi_flash_probe_slave() - Probe for a SPI flash device on a bus 23 * 24 * @flashp: Pointer to place to put flash info, which may be NULL if the 25 * space should be allocated 26 */ 27 static int spi_flash_probe_slave(struct spi_flash *flash) 28 { 29 struct spi_slave *spi = flash->spi; 30 int ret; 31 32 /* Setup spi_slave */ 33 if (!spi) { 34 printf("SF: Failed to set up slave\n"); 35 return -ENODEV; 36 } 37 38 /* Claim spi bus */ 39 ret = spi_claim_bus(spi); 40 if (ret) { 41 debug("SF: Failed to claim SPI bus: %d\n", ret); 42 return ret; 43 } 44 45 ret = spi_nor_scan(flash); 46 if (ret) 47 goto err_read_id; 48 49 #ifdef CONFIG_SPI_FLASH_MTD 50 ret = spi_flash_mtd_register(flash); 51 #endif 52 53 err_read_id: 54 spi_release_bus(spi); 55 return ret; 56 } 57 58 #ifndef CONFIG_DM_SPI_FLASH 59 struct spi_flash *spi_flash_probe(unsigned int busnum, unsigned int cs, 60 unsigned int max_hz, unsigned int spi_mode) 61 { 62 struct spi_slave *bus; 63 struct spi_flash *flash; 64 65 bus = spi_setup_slave(busnum, cs, max_hz, spi_mode); 66 if (!bus) 67 return NULL; 68 69 /* Allocate space if needed (not used by sf-uclass */ 70 flash = calloc(1, sizeof(*flash)); 71 if (!flash) { 72 debug("SF: Failed to allocate spi_flash\n"); 73 return NULL; 74 } 75 76 flash->spi = bus; 77 if (spi_flash_probe_slave(flash)) { 78 spi_free_slave(bus); 79 free(flash); 80 return NULL; 81 } 82 83 return flash; 84 } 85 86 void spi_flash_free(struct spi_flash *flash) 87 { 88 #ifdef CONFIG_SPI_FLASH_MTD 89 spi_flash_mtd_unregister(); 90 #endif 91 spi_free_slave(flash->spi); 92 free(flash); 93 } 94 95 #else /* defined CONFIG_DM_SPI_FLASH */ 96 97 static int spi_flash_std_read(struct udevice *dev, u32 offset, size_t len, 98 void *buf) 99 { 100 struct spi_flash *flash = dev_get_uclass_priv(dev); 101 struct mtd_info *mtd = &flash->mtd; 102 size_t retlen; 103 104 return log_ret(mtd->_read(mtd, offset, len, &retlen, buf)); 105 } 106 107 static int spi_flash_std_write(struct udevice *dev, u32 offset, size_t len, 108 const void *buf) 109 { 110 struct spi_flash *flash = dev_get_uclass_priv(dev); 111 struct mtd_info *mtd = &flash->mtd; 112 size_t retlen; 113 114 return mtd->_write(mtd, offset, len, &retlen, buf); 115 } 116 117 static int spi_flash_std_erase(struct udevice *dev, u32 offset, size_t len) 118 { 119 struct spi_flash *flash = dev_get_uclass_priv(dev); 120 struct mtd_info *mtd = &flash->mtd; 121 struct erase_info instr; 122 123 if (offset % mtd->erasesize || len % mtd->erasesize) { 124 printf("SF: Erase offset/length not multiple of erase size\n"); 125 return -EINVAL; 126 } 127 128 memset(&instr, 0, sizeof(instr)); 129 instr.addr = offset; 130 instr.len = len; 131 132 return mtd->_erase(mtd, &instr); 133 } 134 135 static int spi_flash_std_get_sw_write_prot(struct udevice *dev) 136 { 137 struct spi_flash *flash = dev_get_uclass_priv(dev); 138 139 return spi_flash_cmd_get_sw_write_prot(flash); 140 } 141 142 static int spi_flash_std_bind(struct udevice *udev) 143 { 144 int ret = 0; 145 146 #ifdef CONFIG_MTD_BLK 147 struct udevice *bdev; 148 149 ret = blk_create_devicef(udev, "mtd_blk", "blk", IF_TYPE_MTD, 150 BLK_MTD_SPI_NOR, 512, 0, &bdev); 151 if (ret) 152 printf("Cannot create block device\n"); 153 #endif 154 return ret; 155 } 156 157 static int spi_flash_std_probe(struct udevice *dev) 158 { 159 struct spi_slave *slave = dev_get_parent_priv(dev); 160 struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev); 161 struct spi_flash *flash; 162 163 flash = dev_get_uclass_priv(dev); 164 flash->dev = dev; 165 flash->spi = slave; 166 debug("%s: slave=%p, cs=%d\n", __func__, slave, plat->cs); 167 return spi_flash_probe_slave(flash); 168 } 169 170 static int spi_flash_std_remove(struct udevice *dev) 171 { 172 #ifdef CONFIG_SPI_FLASH_MTD 173 spi_flash_mtd_unregister(); 174 #endif 175 return 0; 176 } 177 178 static const struct dm_spi_flash_ops spi_flash_std_ops = { 179 .read = spi_flash_std_read, 180 .write = spi_flash_std_write, 181 .erase = spi_flash_std_erase, 182 .get_sw_write_prot = spi_flash_std_get_sw_write_prot, 183 }; 184 185 static const struct udevice_id spi_flash_std_ids[] = { 186 { .compatible = "jedec,spi-nor" }, 187 { } 188 }; 189 190 U_BOOT_DRIVER(spi_flash_std) = { 191 .name = "spi_flash_std", 192 .id = UCLASS_SPI_FLASH, 193 .of_match = spi_flash_std_ids, 194 .bind = spi_flash_std_bind, 195 .probe = spi_flash_std_probe, 196 .remove = spi_flash_std_remove, 197 .priv_auto_alloc_size = sizeof(struct spi_flash), 198 .ops = &spi_flash_std_ops, 199 }; 200 201 #endif /* CONFIG_DM_SPI_FLASH */ 202