LXR uboot/cmd/spi.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * (C) Copyright 2002
   4 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
   5 */
   6
   7/*
   8 * SPI Read/Write Utilities
   9 */
  10
  11#include <common.h>
  12#include <command.h>
  13#include <dm.h>
  14#include <errno.h>
  15#include <spi.h>
  16
  17/*-----------------------------------------------------------------------
  18 * Definitions
  19 */
  20
  21#ifndef MAX_SPI_BYTES
  22#   define MAX_SPI_BYTES 32     /* Maximum number of bytes we can handle */
  23#endif
  24
  25/*
  26 * Values from last command.
  27 */
  28static unsigned int     bus;
  29static unsigned int     cs;
  30static unsigned int     mode;
  31static int              bitlen;
  32static uchar            dout[MAX_SPI_BYTES];
  33static uchar            din[MAX_SPI_BYTES];
  34
  35static int do_spi_xfer(int bus, int cs)
  36{
  37        struct spi_slave *slave;
  38        int ret = 0;
  39
  40#ifdef CONFIG_DM_SPI
  41        char name[30], *str;
  42        struct udevice *dev;
  43
  44        snprintf(name, sizeof(name), "generic_%d:%d", bus, cs);
  45        str = strdup(name);
  46        if (!str)
  47                return -ENOMEM;
  48        ret = spi_get_bus_and_cs(bus, cs, 1000000, mode, "spi_generic_drv",
  49                                 str, &dev, &slave);
  50        if (ret)
  51                return ret;
  52#else
  53        slave = spi_setup_slave(bus, cs, 1000000, mode);
  54        if (!slave) {
  55                printf("Invalid device %d:%d\n", bus, cs);
  56                return -EINVAL;
  57        }
  58#endif
  59
  60        ret = spi_claim_bus(slave);
  61        if (ret)
  62                goto done;
  63        ret = spi_xfer(slave, bitlen, dout, din,
  64                       SPI_XFER_BEGIN | SPI_XFER_END);
  65#ifndef CONFIG_DM_SPI
  66        /* We don't get an error code in this case */
  67        if (ret)
  68                ret = -EIO;
  69#endif
  70        if (ret) {
  71                printf("Error %d during SPI transaction\n", ret);
  72        } else {
  73                int j;
  74
  75                for (j = 0; j < ((bitlen + 7) / 8); j++)
  76                        printf("%02X", din[j]);
  77                printf("\n");
  78        }
  79done:
  80        spi_release_bus(slave);
  81#ifndef CONFIG_DM_SPI
  82        spi_free_slave(slave);
  83#endif
  84
  85        return ret;
  86}
  87
  88/*
  89 * SPI read/write
  90 *
  91 * Syntax:
  92 *   spi {dev} {num_bits} {dout}
  93 *     {dev} is the device number for controlling chip select (see TBD)
  94 *     {num_bits} is the number of bits to send & receive (base 10)
  95 *     {dout} is a hexadecimal string of data to send
  96 * The command prints out the hexadecimal string received via SPI.
  97 */
  98
  99int do_spi (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 100{
 101        char  *cp = 0;
 102        uchar tmp;
 103        int   j;
 104
 105        /*
 106         * We use the last specified parameters, unless new ones are
 107         * entered.
 108         */
 109
 110        if ((flag & CMD_FLAG_REPEAT) == 0)
 111        {
 112                if (argc >= 2) {
 113                        mode = CONFIG_DEFAULT_SPI_MODE;
 114                        bus = simple_strtoul(argv[1], &cp, 10);
 115                        if (*cp == ':') {
 116                                cs = simple_strtoul(cp+1, &cp, 10);
 117                        } else {
 118                                cs = bus;
 119                                bus = CONFIG_DEFAULT_SPI_BUS;
 120                        }
 121                        if (*cp == '.')
 122                                mode = simple_strtoul(cp+1, NULL, 10);
 123                }
 124                if (argc >= 3)
 125                        bitlen = simple_strtoul(argv[2], NULL, 10);
 126                if (argc >= 4) {
 127                        cp = argv[3];
 128                        for(j = 0; *cp; j++, cp++) {
 129                                tmp = *cp - '0';
 130                                if(tmp > 9)
 131                                        tmp -= ('A' - '0') - 10;
 132                                if(tmp > 15)
 133                                        tmp -= ('a' - 'A');
 134                                if(tmp > 15) {
 135                                        printf("Hex conversion error on %c\n", *cp);
 136                                        return 1;
 137                                }
 138                                if((j % 2) == 0)
 139                                        dout[j / 2] = (tmp << 4);
 140                                else
 141                                        dout[j / 2] |= tmp;
 142                        }
 143                }
 144        }
 145
 146        if ((bitlen < 0) || (bitlen >  (MAX_SPI_BYTES * 8))) {
 147                printf("Invalid bitlen %d\n", bitlen);
 148                return 1;
 149        }
 150
 151        if (do_spi_xfer(bus, cs))
 152                return 1;
 153
 154        return 0;
 155}
 156
 157/***************************************************/
 158
 159U_BOOT_CMD(
 160        sspi,   5,      1,      do_spi,
 161        "SPI utility command",
 162        "[<bus>:]<cs>[.<mode>] <bit_len> <dout> - Send and receive bits\n"
 163        "<bus>     - Identifies the SPI bus\n"
 164        "<cs>      - Identifies the chip select\n"
 165        "<mode>    - Identifies the SPI mode to use\n"
 166        "<bit_len> - Number of bits to send (base 10)\n"
 167        "<dout>    - Hexadecimal string that gets sent"
 168);
 169