cmd/mdio.c

   1 /*
   2  * (C) Copyright 2011 Freescale Semiconductor, Inc
   3  * Andy Fleming
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 /*
   9  * MDIO Commands
  10  */
  11
  12 #include <common.h>
  13 #include <command.h>
  14 #include <miiphy.h>
  15 #include <phy.h>
  16
  17
  18 static char last_op[2];
  19 static uint last_data;
  20 static uint last_addr_lo;
  21 static uint last_addr_hi;
  22 static uint last_devad_lo;
  23 static uint last_devad_hi;
  24 static uint last_reg_lo;
  25 static uint last_reg_hi;
  26
  27 static int extract_range(char *input, int *plo, int *phi)
  28 {
  29         char *end;
  30         *plo = simple_strtol(input, &end, 16);
  31         if (end == input)
  32                 return -1;
  33
  34         if ((*end == '-') && *(++end))
  35                 *phi = simple_strtol(end, NULL, 16);
  36         else if (*end == '\0')
  37                 *phi = *plo;
  38         else
  39                 return -1;
  40
  41         return 0;
  42 }
  43
  44 static int mdio_write_ranges(struct phy_device *phydev, struct mii_dev *bus,
  45                              int addrlo,
  46                              int addrhi, int devadlo, int devadhi,
  47                              int reglo, int reghi, unsigned short data,
  48                              int extended)
  49 {
  50         int addr, devad, reg;
  51         int err = 0;
  52
  53         for (addr = addrlo; addr <= addrhi; addr++) {
  54                 for (devad = devadlo; devad <= devadhi; devad++) {
  55                         for (reg = reglo; reg <= reghi; reg++) {
  56                                 if (!extended)
  57                                         err = bus->write(bus, addr, devad,
  58                                                          reg, data);
  59                                 else
  60                                         err = phydev->drv->writeext(phydev,
  61                                                         addr, devad, reg, data);
  62
  63                                 if (err)
  64                                         goto err_out;
  65                         }
  66                 }
  67         }
  68
  69 err_out:
  70         return err;
  71 }
  72
  73 static int mdio_read_ranges(struct phy_device *phydev, struct mii_dev *bus,
  74                             int addrlo,
  75                             int addrhi, int devadlo, int devadhi,
  76                             int reglo, int reghi, int extended)
  77 {
  78         int addr, devad, reg;
  79
  80         printf("Reading from bus %s\n", bus->name);
  81         for (addr = addrlo; addr <= addrhi; addr++) {
  82                 printf("PHY at address %x:\n", addr);
  83
  84                 for (devad = devadlo; devad <= devadhi; devad++) {
  85                         for (reg = reglo; reg <= reghi; reg++) {
  86                                 int val;
  87
  88                                 if (!extended)
  89                                         val = bus->read(bus, addr, devad, reg);
  90                                 else
  91                                         val = phydev->drv->readext(phydev, addr,
  92                                                 devad, reg);
  93
  94                                 if (val < 0) {
  95                                         printf("Error\n");
  96
  97                                         return val;
  98                                 }
  99
 100                                 if (devad >= 0)
 101                                         printf("%d.", devad);
 102
 103                                 printf("%d - 0x%x\n", reg, val & 0xffff);
 104                         }
 105                 }
 106         }
 107
 108         return 0;
 109 }
 110
 111 /* The register will be in the form [a[-b].]x[-y] */
 112 static int extract_reg_range(char *input, int *devadlo, int *devadhi,
 113                              int *reglo, int *reghi)
 114 {
 115         char *regstr;
 116
 117         /* use strrchr to find the last string after a '.' */
 118         regstr = strrchr(input, '.');
 119
 120         /* If it exists, extract the devad(s) */
 121         if (regstr) {
 122                 char devadstr[32];
 123
 124                 strncpy(devadstr, input, regstr - input);
 125                 devadstr[regstr - input] = '\0';
 126
 127                 if (extract_range(devadstr, devadlo, devadhi))
 128                         return -1;
 129
 130                 regstr++;
 131         } else {
 132                 /* Otherwise, we have no devad, and we just got regs */
 133                 *devadlo = *devadhi = MDIO_DEVAD_NONE;
 134
 135                 regstr = input;
 136         }
 137
 138         return extract_range(regstr, reglo, reghi);
 139 }
 140
 141 static int extract_phy_range(char *const argv[], int argc, struct mii_dev **bus,
 142                              struct phy_device **phydev,
 143                              int *addrlo, int *addrhi)
 144 {
 145         struct phy_device *dev = *phydev;
 146
 147         if ((argc < 1) || (argc > 2))
 148                 return -1;
 149
 150         /* If there are two arguments, it's busname addr */
 151         if (argc == 2) {
 152                 *bus = miiphy_get_dev_by_name(argv[0]);
 153
 154                 if (!*bus)
 155                         return -1;
 156
 157                 return extract_range(argv[1], addrlo, addrhi);
 158         }
 159
 160         /* It must be one argument, here */
 161
 162         /*
 163          * This argument can be one of two things:
 164          * 1) Ethernet device name
 165          * 2) Just an address (use the previously-used bus)
 166          *
 167          * We check all buses for a PHY which is connected to an ethernet
 168          * device by the given name.  If none are found, we call
 169          * extract_range() on the string, and see if it's an address range.
 170          */
 171         dev = mdio_phydev_for_ethname(argv[0]);
 172
 173         if (dev) {
 174                 *addrlo = *addrhi = dev->addr;
 175                 *bus = dev->bus;
 176
 177                 return 0;
 178         }
 179
 180         /* It's an address or nothing useful */
 181         return extract_range(argv[0], addrlo, addrhi);
 182 }
 183
 184 /* ---------------------------------------------------------------- */
 185 static int do_mdio(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 186 {
 187         char op[2];
 188         int addrlo, addrhi, reglo, reghi, devadlo, devadhi;
 189         unsigned short  data;
 190         int pos = argc - 1;
 191         struct mii_dev *bus;
 192         struct phy_device *phydev = NULL;
 193         int extended = 0;
 194
 195         if (argc < 2)
 196                 return CMD_RET_USAGE;
 197
 198         /*
 199          * We use the last specified parameters, unless new ones are
 200          * entered.
 201          */
 202         op[0] = argv[1][0];
 203         addrlo = last_addr_lo;
 204         addrhi = last_addr_hi;
 205         devadlo = last_devad_lo;
 206         devadhi = last_devad_hi;
 207         reglo  = last_reg_lo;
 208         reghi  = last_reg_hi;
 209         data   = last_data;
 210
 211         bus = mdio_get_current_dev();
 212
 213         if (flag & CMD_FLAG_REPEAT)
 214                 op[0] = last_op[0];
 215
 216         if (strlen(argv[1]) > 1) {
 217                 op[1] = argv[1][1];
 218                 if (op[1] == 'x') {
 219                         phydev = mdio_phydev_for_ethname(argv[2]);
 220
 221                         if (phydev) {
 222                                 addrlo = phydev->addr;
 223                                 addrhi = addrlo;
 224                                 bus = phydev->bus;
 225                                 extended = 1;
 226                         } else {
 227                                 return -1;
 228                         }
 229
 230                         if (!phydev->drv ||
 231                             (!phydev->drv->writeext && (op[0] == 'w')) ||
 232                             (!phydev->drv->readext && (op[0] == 'r'))) {
 233                                 puts("PHY does not have extended functions\n");
 234                                 return -1;
 235                         }
 236                 }
 237         }
 238
 239         switch (op[0]) {
 240         case 'w':
 241                 if (pos > 1)
 242                         data = simple_strtoul(argv[pos--], NULL, 16);
 243         case 'r':
 244                 if (pos > 1)
 245                         if (extract_reg_range(argv[pos--], &devadlo, &devadhi,
 246                                         &reglo, &reghi))
 247                                 return -1;
 248
 249         default:
 250                 if (pos > 1)
 251                         if (extract_phy_range(&(argv[2]), pos - 1, &bus,
 252                                         &phydev, &addrlo, &addrhi))
 253                                 return -1;
 254
 255                 break;
 256         }
 257
 258         if (op[0] == 'l') {
 259                 mdio_list_devices();
 260
 261                 return 0;
 262         }
 263
 264         /* Save the chosen bus */
 265         miiphy_set_current_dev(bus->name);
 266
 267         switch (op[0]) {
 268         case 'w':
 269                 mdio_write_ranges(phydev, bus, addrlo, addrhi, devadlo, devadhi,
 270                                   reglo, reghi, data, extended);
 271                 break;
 272
 273         case 'r':
 274                 mdio_read_ranges(phydev, bus, addrlo, addrhi, devadlo, devadhi,
 275                                  reglo, reghi, extended);
 276                 break;
 277         }
 278
 279         /*
 280          * Save the parameters for repeats.
 281          */
 282         last_op[0] = op[0];
 283         last_addr_lo = addrlo;
 284         last_addr_hi = addrhi;
 285         last_devad_lo = devadlo;
 286         last_devad_hi = devadhi;
 287         last_reg_lo  = reglo;
 288         last_reg_hi  = reghi;
 289         last_data    = data;
 290
 291         return 0;
 292 }
 293
 294 /***************************************************/
 295
 296 U_BOOT_CMD(
 297         mdio,   6,      1,      do_mdio,
 298         "MDIO utility commands",
 299         "list                   - List MDIO buses\n"
 300         "mdio read <phydev> [<devad>.]<reg> - "
 301                 "read PHY's register at <devad>.<reg>\n"
 302         "mdio write <phydev> [<devad>.]<reg> <data> - "
 303                 "write PHY's register at <devad>.<reg>\n"
 304         "mdio rx <phydev> [<devad>.]<reg> - "
 305                 "read PHY's extended register at <devad>.<reg>\n"
 306         "mdio wx <phydev> [<devad>.]<reg> <data> - "
 307                 "write PHY's extended register at <devad>.<reg>\n"
 308         "<phydev> may be:\n"
 309         "   <busname>  <addr>\n"
 310         "   <addr>\n"
 311         "   <eth name>\n"
 312         "<addr> <devad>, and <reg> may be ranges, e.g. 1-5.4-0x1f.\n"
 313 );