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 static struct spi_flash *spi_flash_probe_tail(struct spi_slave *bus) 59 { 60 struct spi_flash *flash; 61 62 /* Allocate space if needed (not used by sf-uclass */ 63 flash = calloc(1, sizeof(*flash)); 64 if (!flash) { 65 debug("SF: Failed to allocate spi_flash\n"); 66 return NULL; 67 } 68 69 flash->spi = bus; 70 if (spi_flash_probe_slave(flash)) { 71 spi_free_slave(bus); 72 free(flash); 73 return NULL; 74 } 75 76 return flash; 77 } 78 79 struct spi_flash *spi_flash_probe(unsigned int busnum, unsigned int cs, 80 unsigned int max_hz, unsigned int spi_mode) 81 { 82 struct spi_slave *bus; 83 84 bus = spi_setup_slave(busnum, cs, max_hz, spi_mode); 85 if (!bus) 86 return NULL; 87 return spi_flash_probe_tail(bus); 88 } 89 90 void spi_flash_free(struct spi_flash *flash) 91 { 92 #ifdef CONFIG_SPI_FLASH_MTD 93 spi_flash_mtd_unregister(); 94 #endif 95 spi_free_slave(flash->spi); 96 free(flash); 97 } 98 99 #else /* defined CONFIG_DM_SPI_FLASH */ 100 101 static int spi_flash_std_read(struct udevice *dev, u32 offset, size_t len, 102 void *buf) 103 { 104 struct spi_flash *flash = dev_get_uclass_priv(dev); 105 106 return spi_flash_cmd_read_ops(flash, offset, len, buf); 107 } 108 109 static int spi_flash_std_write(struct udevice *dev, u32 offset, size_t len, 110 const void *buf) 111 { 112 struct spi_flash *flash = dev_get_uclass_priv(dev); 113 114 #if defined(CONFIG_SPI_FLASH_SST) 115 if (flash->flags & SNOR_F_SST_WR) { 116 if (flash->spi->mode & SPI_TX_BYTE) 117 return sst_write_bp(flash, offset, len, buf); 118 else 119 return sst_write_wp(flash, offset, len, buf); 120 } 121 #endif 122 123 return spi_flash_cmd_write_ops(flash, offset, len, buf); 124 } 125 126 static int spi_flash_std_erase(struct udevice *dev, u32 offset, size_t len) 127 { 128 struct spi_flash *flash = dev_get_uclass_priv(dev); 129 130 return spi_flash_cmd_erase_ops(flash, offset, len); 131 } 132 133 static int spi_flash_std_probe(struct udevice *dev) 134 { 135 struct spi_slave *slave = dev_get_parent_priv(dev); 136 struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev); 137 struct spi_flash *flash; 138 139 flash = dev_get_uclass_priv(dev); 140 flash->dev = dev; 141 flash->spi = slave; 142 debug("%s: slave=%p, cs=%d\n", __func__, slave, plat->cs); 143 return spi_flash_probe_slave(flash); 144 } 145 146 static const struct dm_spi_flash_ops spi_flash_std_ops = { 147 .read = spi_flash_std_read, 148 .write = spi_flash_std_write, 149 .erase = spi_flash_std_erase, 150 }; 151 152 static const struct udevice_id spi_flash_std_ids[] = { 153 { .compatible = "spi-flash" }, 154 { } 155 }; 156 157 U_BOOT_DRIVER(spi_flash_std) = { 158 .name = "spi_flash_std", 159 .id = UCLASS_SPI_FLASH, 160 .of_match = spi_flash_std_ids, 161 .probe = spi_flash_std_probe, 162 .priv_auto_alloc_size = sizeof(struct spi_flash), 163 .ops = &spi_flash_std_ops, 164 }; 165 166 #endif /* CONFIG_DM_SPI_FLASH */ 167