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 #ifndef CONFIG_DEFAULT_SPI_BUS
  26 #   define CONFIG_DEFAULT_SPI_BUS       0
  27 #endif
  28 #ifndef CONFIG_DEFAULT_SPI_MODE
  29 #   define CONFIG_DEFAULT_SPI_MODE      SPI_MODE_0
  30 #endif
  31
  32 /*
  33  * Values from last command.
  34  */
  35 static unsigned int     bus;
  36 static unsigned int     cs;
  37 static unsigned int     mode;
  38 static int              bitlen;
  39 static uchar            dout[MAX_SPI_BYTES];
  40 static uchar            din[MAX_SPI_BYTES];
  41
  42 static int do_spi_xfer(int bus, int cs)
  43 {
  44         struct spi_slave *slave;
  45         int ret = 0;
  46
  47 #ifdef CONFIG_DM_SPI
  48         char name[30], *str;
  49         struct udevice *dev;
  50
  51         snprintf(name, sizeof(name), "generic_%d:%d", bus, cs);
  52         str = strdup(name);
  53         if (!str)
  54                 return -ENOMEM;
  55         ret = spi_get_bus_and_cs(bus, cs, 1000000, mode, "spi_generic_drv",
  56                                  str, &dev, &slave);
  57         if (ret)
  58                 return ret;
  59 #else
  60         slave = spi_setup_slave(bus, cs, 1000000, mode);
  61         if (!slave) {
  62                 printf("Invalid device %d:%d\n", bus, cs);
  63                 return -EINVAL;
  64         }
  65 #endif
  66
  67         ret = spi_claim_bus(slave);
  68         if (ret)
  69                 goto done;
  70         ret = spi_xfer(slave, bitlen, dout, din,
  71                        SPI_XFER_BEGIN | SPI_XFER_END);
  72 #ifndef CONFIG_DM_SPI
  73         /* We don't get an error code in this case */
  74         if (ret)
  75                 ret = -EIO;
  76 #endif
  77         if (ret) {
  78                 printf("Error %d during SPI transaction\n", ret);
  79         } else {
  80                 int j;
  81
  82                 for (j = 0; j < ((bitlen + 7) / 8); j++)
  83                         printf("%02X", din[j]);
  84                 printf("\n");
  85         }
  86 done:
  87         spi_release_bus(slave);
  88 #ifndef CONFIG_DM_SPI
  89         spi_free_slave(slave);
  90 #endif
  91
  92         return ret;
  93 }
  94
  95 /*
  96  * SPI read/write
  97  *
  98  * Syntax:
  99  *   spi {dev} {num_bits} {dout}
 100  *     {dev} is the device number for controlling chip select (see TBD)
 101  *     {num_bits} is the number of bits to send & receive (base 10)
 102  *     {dout} is a hexadecimal string of data to send
 103  * The command prints out the hexadecimal string received via SPI.
 104  */
 105
 106 int do_spi (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 107 {
 108         char  *cp = 0;
 109         uchar tmp;
 110         int   j;
 111
 112         /*
 113          * We use the last specified parameters, unless new ones are
 114          * entered.
 115          */
 116
 117         if ((flag & CMD_FLAG_REPEAT) == 0)
 118         {
 119                 if (argc >= 2) {
 120                         mode = CONFIG_DEFAULT_SPI_MODE;
 121                         bus = simple_strtoul(argv[1], &cp, 10);
 122                         if (*cp == ':') {
 123                                 cs = simple_strtoul(cp+1, &cp, 10);
 124                         } else {
 125                                 cs = bus;
 126                                 bus = CONFIG_DEFAULT_SPI_BUS;
 127                         }
 128                         if (*cp == '.')
 129                                 mode = simple_strtoul(cp+1, NULL, 10);
 130                 }
 131                 if (argc >= 3)
 132                         bitlen = simple_strtoul(argv[2], NULL, 10);
 133                 if (argc >= 4) {
 134                         cp = argv[3];
 135                         for(j = 0; *cp; j++, cp++) {
 136                                 tmp = *cp - '0';
 137                                 if(tmp > 9)
 138                                         tmp -= ('A' - '0') - 10;
 139                                 if(tmp > 15)
 140                                         tmp -= ('a' - 'A');
 141                                 if(tmp > 15) {
 142                                         printf("Hex conversion error on %c\n", *cp);
 143                                         return 1;
 144                                 }
 145                                 if((j % 2) == 0)
 146                                         dout[j / 2] = (tmp << 4);
 147                                 else
 148                                         dout[j / 2] |= tmp;
 149                         }
 150                 }
 151         }
 152
 153         if ((bitlen < 0) || (bitlen >  (MAX_SPI_BYTES * 8))) {
 154                 printf("Invalid bitlen %d\n", bitlen);
 155                 return 1;
 156         }
 157
 158         if (do_spi_xfer(bus, cs))
 159                 return 1;
 160
 161         return 0;
 162 }
 163
 164 /***************************************************/
 165
 166 U_BOOT_CMD(
 167         sspi,   5,      1,      do_spi,
 168         "SPI utility command",
 169         "[<bus>:]<cs>[.<mode>] <bit_len> <dout> - Send and receive bits\n"
 170         "<bus>     - Identifies the SPI bus\n"
 171         "<cs>      - Identifies the chip select\n"
 172         "<mode>    - Identifies the SPI mode to use\n"
 173         "<bit_len> - Number of bits to send (base 10)\n"
 174         "<dout>    - Hexadecimal string that gets sent"
 175 );