drivers/mtd/spi/sf_probe.c

   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 #ifdef CONFIG_OF_SPI_FLASH
  91 struct spi_flash *spi_flash_probe_fdt(const void *blob, int slave_node,
  92                                       int spi_node)
  93 {
  94         struct spi_slave *bus;
  95
  96         bus = spi_setup_slave_fdt(blob, slave_node, spi_node);
  97         if (!bus)
  98                 return NULL;
  99         return spi_flash_probe_tail(bus);
 100 }
 101 #endif
 102
 103 void spi_flash_free(struct spi_flash *flash)
 104 {
 105 #ifdef CONFIG_SPI_FLASH_MTD
 106         spi_flash_mtd_unregister();
 107 #endif
 108         spi_free_slave(flash->spi);
 109         free(flash);
 110 }
 111
 112 #else /* defined CONFIG_DM_SPI_FLASH */
 113
 114 static int spi_flash_std_read(struct udevice *dev, u32 offset, size_t len,
 115                               void *buf)
 116 {
 117         struct spi_flash *flash = dev_get_uclass_priv(dev);
 118
 119         return spi_flash_cmd_read_ops(flash, offset, len, buf);
 120 }
 121
 122 static int spi_flash_std_write(struct udevice *dev, u32 offset, size_t len,
 123                         const void *buf)
 124 {
 125         struct spi_flash *flash = dev_get_uclass_priv(dev);
 126
 127 #if defined(CONFIG_SPI_FLASH_SST)
 128         if (flash->flags & SNOR_F_SST_WR) {
 129                 if (flash->spi->mode & SPI_TX_BYTE)
 130                         return sst_write_bp(flash, offset, len, buf);
 131                 else
 132                         return sst_write_wp(flash, offset, len, buf);
 133         }
 134 #endif
 135
 136         return spi_flash_cmd_write_ops(flash, offset, len, buf);
 137 }
 138
 139 static int spi_flash_std_erase(struct udevice *dev, u32 offset, size_t len)
 140 {
 141         struct spi_flash *flash = dev_get_uclass_priv(dev);
 142
 143         return spi_flash_cmd_erase_ops(flash, offset, len);
 144 }
 145
 146 static int spi_flash_std_probe(struct udevice *dev)
 147 {
 148         struct spi_slave *slave = dev_get_parent_priv(dev);
 149         struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
 150         struct spi_flash *flash;
 151
 152         flash = dev_get_uclass_priv(dev);
 153         flash->dev = dev;
 154         flash->spi = slave;
 155         debug("%s: slave=%p, cs=%d\n", __func__, slave, plat->cs);
 156         return spi_flash_probe_slave(flash);
 157 }
 158
 159 static const struct dm_spi_flash_ops spi_flash_std_ops = {
 160         .read = spi_flash_std_read,
 161         .write = spi_flash_std_write,
 162         .erase = spi_flash_std_erase,
 163 };
 164
 165 static const struct udevice_id spi_flash_std_ids[] = {
 166         { .compatible = "spi-flash" },
 167         { }
 168 };
 169
 170 U_BOOT_DRIVER(spi_flash_std) = {
 171         .name           = "spi_flash_std",
 172         .id             = UCLASS_SPI_FLASH,
 173         .of_match       = spi_flash_std_ids,
 174         .probe          = spi_flash_std_probe,
 175         .priv_auto_alloc_size = sizeof(struct spi_flash),
 176         .ops            = &spi_flash_std_ops,
 177 };
 178
 179 #endif /* CONFIG_DM_SPI_FLASH */