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 unsigned int     freq;
  32static int              bitlen;
  33static uchar            dout[MAX_SPI_BYTES];
  34static uchar            din[MAX_SPI_BYTES];
  35
  36static int do_spi_xfer(int bus, int cs)
  37{
  38        struct spi_slave *slave;
  39        int ret = 0;
  40
  41#if CONFIG_IS_ENABLED(DM_SPI)
  42        char name[30], *str;
  43        struct udevice *dev;
  44
  45        snprintf(name, sizeof(name), "generic_%d:%d", bus, cs);
  46        str = strdup(name);
  47        if (!str)
  48                return -ENOMEM;
  49        ret = spi_get_bus_and_cs(bus, cs, freq, mode, "spi_generic_drv",
  50                                 str, &dev, &slave);
  51        if (ret)
  52                return ret;
  53#else
  54        slave = spi_setup_slave(bus, cs, freq, mode);
  55        if (!slave) {
  56                printf("Invalid device %d:%d\n", bus, cs);
  57                return -EINVAL;
  58        }
  59#endif
  60
  61        ret = spi_claim_bus(slave);
  62        if (ret)
  63                goto done;
  64        ret = spi_xfer(slave, bitlen, dout, din,
  65                       SPI_XFER_BEGIN | SPI_XFER_END);
  66#if !CONFIG_IS_ENABLED(DM_SPI)
  67        /* We don't get an error code in this case */
  68        if (ret)
  69                ret = -EIO;
  70#endif
  71        if (ret) {
  72                printf("Error %d during SPI transaction\n", ret);
  73        } else {
  74                int j;
  75
  76                for (j = 0; j < ((bitlen + 7) / 8); j++)
  77                        printf("%02X", din[j]);
  78                printf("\n");
  79        }
  80done:
  81        spi_release_bus(slave);
  82#if !CONFIG_IS_ENABLED(DM_SPI)
  83        spi_free_slave(slave);
  84#endif
  85
  86        return ret;
  87}
  88
  89/*
  90 * SPI read/write
  91 *
  92 * Syntax:
  93 *   spi {dev} {num_bits} {dout}
  94 *     {dev} is the device number for controlling chip select (see TBD)
  95 *     {num_bits} is the number of bits to send & receive (base 10)
  96 *     {dout} is a hexadecimal string of data to send
  97 * The command prints out the hexadecimal string received via SPI.
  98 */
  99
 100int do_spi(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 101{
 102        char  *cp = 0;
 103        uchar tmp;
 104        int   j;
 105
 106        /*
 107         * We use the last specified parameters, unless new ones are
 108         * entered.
 109         */
 110        if (freq == 0)
 111                freq = 1000000;
 112
 113        if ((flag & CMD_FLAG_REPEAT) == 0)
 114        {
 115                if (argc >= 2) {
 116                        mode = CONFIG_DEFAULT_SPI_MODE;
 117                        bus = simple_strtoul(argv[1], &cp, 10);
 118                        if (*cp == ':') {
 119                                cs = simple_strtoul(cp+1, &cp, 10);
 120                        } else {
 121                                cs = bus;
 122                                bus = CONFIG_DEFAULT_SPI_BUS;
 123                        }
 124                        if (*cp == '.')
 125                                mode = simple_strtoul(cp+1, &cp, 10);
 126                        if (*cp == '@')
 127                                freq = simple_strtoul(cp+1, &cp, 10);
 128                }
 129                if (argc >= 3)
 130                        bitlen = simple_strtoul(argv[2], NULL, 10);
 131                if (argc >= 4) {
 132                        cp = argv[3];
 133                        for(j = 0; *cp; j++, cp++) {
 134                                tmp = *cp - '0';
 135                                if(tmp > 9)
 136                                        tmp -= ('A' - '0') - 10;
 137                                if(tmp > 15)
 138                                        tmp -= ('a' - 'A');
 139                                if(tmp > 15) {
 140                                        printf("Hex conversion error on %c\n", *cp);
 141                                        return 1;
 142                                }
 143                                if((j % 2) == 0)
 144                                        dout[j / 2] = (tmp << 4);
 145                                else
 146                                        dout[j / 2] |= tmp;
 147                        }
 148                }
 149        }
 150
 151        if ((bitlen < 0) || (bitlen >  (MAX_SPI_BYTES * 8))) {
 152                printf("Invalid bitlen %d\n", bitlen);
 153                return 1;
 154        }
 155
 156        if (do_spi_xfer(bus, cs))
 157                return 1;
 158
 159        return 0;
 160}
 161
 162/***************************************************/
 163
 164U_BOOT_CMD(
 165        sspi,   5,      1,      do_spi,
 166        "SPI utility command",
 167        "[<bus>:]<cs>[.<mode>][@<freq>] <bit_len> <dout> - Send and receive bits\n"
 168        "<bus>     - Identifies the SPI bus\n"
 169        "<cs>      - Identifies the chip select\n"
 170        "<mode>    - Identifies the SPI mode to use\n"
 171        "<freq>    - Identifies the SPI bus frequency in Hz\n"
 172        "<bit_len> - Number of bits to send (base 10)\n"
 173        "<dout>    - Hexadecimal string that gets sent"
 174);
 175