cmd/spi.c

   1 /*
   2  * (C) Copyright 2002
   3  * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 /*
   9  * SPI Read/Write Utilities
  10  */
  11
  12 #include <common.h>
  13 #include <command.h>
  14 #include <dm.h>
  15 #include <errno.h>
  16 #include <spi.h>
  17
  18 /*-----------------------------------------------------------------------
  19  * Definitions
  20  */
  21
  22 #ifndef MAX_SPI_BYTES
  23 #   define MAX_SPI_BYTES 32     /* Maximum number of bytes we can handle */
  24 #endif
  25
  26 #ifndef CONFIG_DEFAULT_SPI_BUS
  27 #   define CONFIG_DEFAULT_SPI_BUS       0
  28 #endif
  29 #ifndef CONFIG_DEFAULT_SPI_MODE
  30 #   define CONFIG_DEFAULT_SPI_MODE      SPI_MODE_0
  31 #endif
  32
  33 /*
  34  * Values from last command.
  35  */
  36 static unsigned int     bus;
  37 static unsigned int     cs;
  38 static unsigned int     mode;
  39 static int              bitlen;
  40 static uchar            dout[MAX_SPI_BYTES];
  41 static uchar            din[MAX_SPI_BYTES];
  42
  43 static int do_spi_xfer(int bus, int cs)
  44 {
  45         struct spi_slave *slave;
  46         int ret = 0;
  47
  48 #ifdef CONFIG_DM_SPI
  49         char name[30], *str;
  50         struct udevice *dev;
  51
  52         snprintf(name, sizeof(name), "generic_%d:%d", bus, cs);
  53         str = strdup(name);
  54         if (!str)
  55                 return -ENOMEM;
  56         ret = spi_get_bus_and_cs(bus, cs, 1000000, mode, "spi_generic_drv",
  57                                  str, &dev, &slave);
  58         if (ret)
  59                 return ret;
  60 #else
  61         slave = spi_setup_slave(bus, cs, 1000000, mode);
  62         if (!slave) {
  63                 printf("Invalid device %d:%d\n", bus, cs);
  64                 return -EINVAL;
  65         }
  66 #endif
  67
  68         ret = spi_claim_bus(slave);
  69         if (ret)
  70                 goto done;
  71         ret = spi_xfer(slave, bitlen, dout, din,
  72                        SPI_XFER_BEGIN | SPI_XFER_END);
  73 #ifndef CONFIG_DM_SPI
  74         /* We don't get an error code in this case */
  75         if (ret)
  76                 ret = -EIO;
  77 #endif
  78         if (ret) {
  79                 printf("Error %d during SPI transaction\n", ret);
  80         } else {
  81                 int j;
  82
  83                 for (j = 0; j < ((bitlen + 7) / 8); j++)
  84                         printf("%02X", din[j]);
  85                 printf("\n");
  86         }
  87 done:
  88         spi_release_bus(slave);
  89 #ifndef CONFIG_DM_SPI
  90         spi_free_slave(slave);
  91 #endif
  92
  93         return ret;
  94 }
  95
  96 /*
  97  * SPI read/write
  98  *
  99  * Syntax:
 100  *   spi {dev} {num_bits} {dout}
 101  *     {dev} is the device number for controlling chip select (see TBD)
 102  *     {num_bits} is the number of bits to send & receive (base 10)
 103  *     {dout} is a hexadecimal string of data to send
 104  * The command prints out the hexadecimal string received via SPI.
 105  */
 106
 107 int do_spi (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 108 {
 109         char  *cp = 0;
 110         uchar tmp;
 111         int   j;
 112
 113         /*
 114          * We use the last specified parameters, unless new ones are
 115          * entered.
 116          */
 117
 118         if ((flag & CMD_FLAG_REPEAT) == 0)
 119         {
 120                 if (argc >= 2) {
 121                         mode = CONFIG_DEFAULT_SPI_MODE;
 122                         bus = simple_strtoul(argv[1], &cp, 10);
 123                         if (*cp == ':') {
 124                                 cs = simple_strtoul(cp+1, &cp, 10);
 125                         } else {
 126                                 cs = bus;
 127                                 bus = CONFIG_DEFAULT_SPI_BUS;
 128                         }
 129                         if (*cp == '.')
 130                                 mode = simple_strtoul(cp+1, NULL, 10);
 131                 }
 132                 if (argc >= 3)
 133                         bitlen = simple_strtoul(argv[2], NULL, 10);
 134                 if (argc >= 4) {
 135                         cp = argv[3];
 136                         for(j = 0; *cp; j++, cp++) {
 137                                 tmp = *cp - '0';
 138                                 if(tmp > 9)
 139                                         tmp -= ('A' - '0') - 10;
 140                                 if(tmp > 15)
 141                                         tmp -= ('a' - 'A');
 142                                 if(tmp > 15) {
 143                                         printf("Hex conversion error on %c\n", *cp);
 144                                         return 1;
 145                                 }
 146                                 if((j % 2) == 0)
 147                                         dout[j / 2] = (tmp << 4);
 148                                 else
 149                                         dout[j / 2] |= tmp;
 150                         }
 151                 }
 152         }
 153
 154         if ((bitlen < 0) || (bitlen >  (MAX_SPI_BYTES * 8))) {
 155                 printf("Invalid bitlen %d\n", bitlen);
 156                 return 1;
 157         }
 158
 159         if (do_spi_xfer(bus, cs))
 160                 return 1;
 161
 162         return 0;
 163 }
 164
 165 /***************************************************/
 166
 167 U_BOOT_CMD(
 168         sspi,   5,      1,      do_spi,
 169         "SPI utility command",
 170         "[<bus>:]<cs>[.<mode>] <bit_len> <dout> - Send and receive bits\n"
 171         "<bus>     - Identifies the SPI bus\n"
 172         "<cs>      - Identifies the chip select\n"
 173         "<mode>    - Identifies the SPI mode to use\n"
 174         "<bit_len> - Number of bits to send (base 10)\n"
 175         "<dout>    - Hexadecimal string that gets sent"
 176 );