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 <dm.h> 13 #include <errno.h> 14 #include <malloc.h> 15 #include <spi.h> 16 #include <spi_flash.h> 17 18 #include "sf_internal.h" 19 20 /** 21 * spi_flash_probe_slave() - Probe for a SPI flash device on a bus 22 * 23 * @flashp: Pointer to place to put flash info, which may be NULL if the 24 * space should be allocated 25 */ 26 static int spi_flash_probe_slave(struct spi_flash *flash) 27 { 28 struct spi_slave *spi = flash->spi; 29 int ret; 30 31 /* Setup spi_slave */ 32 if (!spi) { 33 printf("SF: Failed to set up slave\n"); 34 return -ENODEV; 35 } 36 37 /* Claim spi bus */ 38 ret = spi_claim_bus(spi); 39 if (ret) { 40 debug("SF: Failed to claim SPI bus: %d\n", ret); 41 return ret; 42 } 43 44 ret = spi_flash_scan(flash); 45 if (ret) 46 goto err_read_id; 47 48 #ifdef CONFIG_SPI_FLASH_MTD 49 ret = spi_flash_mtd_register(flash); 50 #endif 51 52 err_read_id: 53 spi_release_bus(spi); 54 return ret; 55 } 56 57 #ifndef CONFIG_DM_SPI_FLASH 58 struct spi_flash *spi_flash_probe(unsigned int busnum, unsigned int cs, 59 unsigned int max_hz, unsigned int spi_mode) 60 { 61 struct spi_slave *bus; 62 struct spi_flash *flash; 63 64 bus = spi_setup_slave(busnum, cs, max_hz, spi_mode); 65 if (!bus) 66 return NULL; 67 68 /* Allocate space if needed (not used by sf-uclass */ 69 flash = calloc(1, sizeof(*flash)); 70 if (!flash) { 71 debug("SF: Failed to allocate spi_flash\n"); 72 return NULL; 73 } 74 75 flash->spi = bus; 76 if (spi_flash_probe_slave(flash)) { 77 spi_free_slave(bus); 78 free(flash); 79 return NULL; 80 } 81 82 return flash; 83 } 84 85 void spi_flash_free(struct spi_flash *flash) 86 { 87 #ifdef CONFIG_SPI_FLASH_MTD 88 spi_flash_mtd_unregister(); 89 #endif 90 spi_free_slave(flash->spi); 91 free(flash); 92 } 93 94 #else /* defined CONFIG_DM_SPI_FLASH */ 95 96 static int spi_flash_std_read(struct udevice *dev, u32 offset, size_t len, 97 void *buf) 98 { 99 struct spi_flash *flash = dev_get_uclass_priv(dev); 100 101 return spi_flash_cmd_read_ops(flash, offset, len, buf); 102 } 103 104 static int spi_flash_std_write(struct udevice *dev, u32 offset, size_t len, 105 const void *buf) 106 { 107 struct spi_flash *flash = dev_get_uclass_priv(dev); 108 109 #if defined(CONFIG_SPI_FLASH_SST) 110 if (flash->flags & SNOR_F_SST_WR) { 111 if (flash->spi->mode & SPI_TX_BYTE) 112 return sst_write_bp(flash, offset, len, buf); 113 else 114 return sst_write_wp(flash, offset, len, buf); 115 } 116 #endif 117 118 return spi_flash_cmd_write_ops(flash, offset, len, buf); 119 } 120 121 static int spi_flash_std_erase(struct udevice *dev, u32 offset, size_t len) 122 { 123 struct spi_flash *flash = dev_get_uclass_priv(dev); 124 125 return spi_flash_cmd_erase_ops(flash, offset, len); 126 } 127 128 static int spi_flash_std_probe(struct udevice *dev) 129 { 130 struct spi_slave *slave = dev_get_parent_priv(dev); 131 struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev); 132 struct spi_flash *flash; 133 134 flash = dev_get_uclass_priv(dev); 135 flash->dev = dev; 136 flash->spi = slave; 137 debug("%s: slave=%p, cs=%d\n", __func__, slave, plat->cs); 138 return spi_flash_probe_slave(flash); 139 } 140 141 static const struct dm_spi_flash_ops spi_flash_std_ops = { 142 .read = spi_flash_std_read, 143 .write = spi_flash_std_write, 144 .erase = spi_flash_std_erase, 145 }; 146 147 static const struct udevice_id spi_flash_std_ids[] = { 148 { .compatible = "spi-flash" }, 149 { } 150 }; 151 152 U_BOOT_DRIVER(spi_flash_std) = { 153 .name = "spi_flash_std", 154 .id = UCLASS_SPI_FLASH, 155 .of_match = spi_flash_std_ids, 156 .probe = spi_flash_std_probe, 157 .priv_auto_alloc_size = sizeof(struct spi_flash), 158 .ops = &spi_flash_std_ops, 159 }; 160 161 #endif /* CONFIG_DM_SPI_FLASH */ 162