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  * @spi: Bus to probe
  24  * @flashp: Pointer to place to put flash info, which may be NULL if the
  25  * space should be allocated
  26  */
  27 int spi_flash_probe_slave(struct spi_slave *spi, struct spi_flash *flash)
  28 {
  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(spi, flash);
  45         if (ret) {
  46                 ret = -EINVAL;
  47                 goto err_read_id;
  48         }
  49
  50 #ifdef CONFIG_SPI_FLASH_MTD
  51         ret = spi_flash_mtd_register(flash);
  52 #endif
  53
  54 err_read_id:
  55         spi_release_bus(spi);
  56         return ret;
  57 }
  58
  59 #ifndef CONFIG_DM_SPI_FLASH
  60 struct spi_flash *spi_flash_probe_tail(struct spi_slave *bus)
  61 {
  62         struct spi_flash *flash;
  63
  64         /* Allocate space if needed (not used by sf-uclass */
  65         flash = calloc(1, sizeof(*flash));
  66         if (!flash) {
  67                 debug("SF: Failed to allocate spi_flash\n");
  68                 return NULL;
  69         }
  70
  71         if (spi_flash_probe_slave(bus, flash)) {
  72                 spi_free_slave(bus);
  73                 free(flash);
  74                 return NULL;
  75         }
  76
  77         return flash;
  78 }
  79
  80 struct spi_flash *spi_flash_probe(unsigned int busnum, unsigned int cs,
  81                 unsigned int max_hz, unsigned int spi_mode)
  82 {
  83         struct spi_slave *bus;
  84
  85         bus = spi_setup_slave(busnum, cs, max_hz, spi_mode);
  86         if (!bus)
  87                 return NULL;
  88         return spi_flash_probe_tail(bus);
  89 }
  90
  91 #ifdef CONFIG_OF_SPI_FLASH
  92 struct spi_flash *spi_flash_probe_fdt(const void *blob, int slave_node,
  93                                       int spi_node)
  94 {
  95         struct spi_slave *bus;
  96
  97         bus = spi_setup_slave_fdt(blob, slave_node, spi_node);
  98         if (!bus)
  99                 return NULL;
 100         return spi_flash_probe_tail(bus);
 101 }
 102 #endif
 103
 104 void spi_flash_free(struct spi_flash *flash)
 105 {
 106 #ifdef CONFIG_SPI_FLASH_MTD
 107         spi_flash_mtd_unregister();
 108 #endif
 109         spi_free_slave(flash->spi);
 110         free(flash);
 111 }
 112
 113 #else /* defined CONFIG_DM_SPI_FLASH */
 114
 115 static int spi_flash_std_read(struct udevice *dev, u32 offset, size_t len,
 116                               void *buf)
 117 {
 118         struct spi_flash *flash = dev_get_uclass_priv(dev);
 119
 120         return spi_flash_cmd_read_ops(flash, offset, len, buf);
 121 }
 122
 123 int spi_flash_std_write(struct udevice *dev, u32 offset, size_t len,
 124                         const void *buf)
 125 {
 126         struct spi_flash *flash = dev_get_uclass_priv(dev);
 127
 128 #if defined(CONFIG_SPI_FLASH_SST)
 129         if (flash->flags & SNOR_F_SST_WR) {
 130                 if (flash->spi->op_mode_tx & SPI_OPM_TX_BP)
 131                         return sst_write_bp(flash, offset, len, buf);
 132                 else
 133                         return sst_write_wp(flash, offset, len, buf);
 134         }
 135 #endif
 136
 137         return spi_flash_cmd_write_ops(flash, offset, len, buf);
 138 }
 139
 140 int spi_flash_std_erase(struct udevice *dev, u32 offset, size_t len)
 141 {
 142         struct spi_flash *flash = dev_get_uclass_priv(dev);
 143
 144         return spi_flash_cmd_erase_ops(flash, offset, len);
 145 }
 146
 147 int spi_flash_std_probe(struct udevice *dev)
 148 {
 149         struct spi_slave *slave = dev_get_parent_priv(dev);
 150         struct dm_spi_slave_platdata *plat = dev_get_parent_platdata(dev);
 151         struct spi_flash *flash;
 152
 153         flash = dev_get_uclass_priv(dev);
 154         flash->dev = dev;
 155         debug("%s: slave=%p, cs=%d\n", __func__, slave, plat->cs);
 156         return spi_flash_probe_slave(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 */