board/gateworks/gw_ventana/gsc.c

   1 /*
   2  * Copyright (C) 2013 Gateworks Corporation
   3  *
   4  * Author: Tim Harvey <tharvey@gateworks.com>
   5  *
   6  * SPDX-License-Identifier: GPL-2.0+
   7  */
   8
   9 #include <asm/errno.h>
  10 #include <common.h>
  11 #include <i2c.h>
  12 #include <linux/ctype.h>
  13
  14 #include "ventana_eeprom.h"
  15 #include "gsc.h"
  16
  17 /*
  18  * The Gateworks System Controller will fail to ACK a master transaction if
  19  * it is busy, which can occur during its 1HZ timer tick while reading ADC's.
  20  * When this does occur, it will never be busy long enough to fail more than
  21  * 2 back-to-back transfers.  Thus we wrap i2c_read and i2c_write with
  22  * 3 retries.
  23  */
  24 int gsc_i2c_read(uchar chip, uint addr, int alen, uchar *buf, int len)
  25 {
  26         int retry = 3;
  27         int n = 0;
  28         int ret;
  29
  30         while (n++ < retry) {
  31                 ret = i2c_read(chip, addr, alen, buf, len);
  32                 if (!ret)
  33                         break;
  34                 debug("%s: 0x%02x 0x%02x retry%d: %d\n", __func__, chip, addr,
  35                       n, ret);
  36                 if (ret != -ENODEV)
  37                         break;
  38                 mdelay(10);
  39         }
  40         return ret;
  41 }
  42
  43 int gsc_i2c_write(uchar chip, uint addr, int alen, uchar *buf, int len)
  44 {
  45         int retry = 3;
  46         int n = 0;
  47         int ret;
  48
  49         while (n++ < retry) {
  50                 ret = i2c_write(chip, addr, alen, buf, len);
  51                 if (!ret)
  52                         break;
  53                 debug("%s: 0x%02x 0x%02x retry%d: %d\n", __func__, chip, addr,
  54                       n, ret);
  55                 if (ret != -ENODEV)
  56                         break;
  57                 mdelay(10);
  58         }
  59         mdelay(100);
  60         return ret;
  61 }
  62
  63 static void read_hwmon(const char *name, uint reg, uint size)
  64 {
  65         unsigned char buf[3];
  66         uint ui;
  67
  68         printf("%-8s:", name);
  69         memset(buf, 0, sizeof(buf));
  70         if (gsc_i2c_read(GSC_HWMON_ADDR, reg, 1, buf, size)) {
  71                 puts("fRD\n");
  72         } else {
  73                 ui = buf[0] | (buf[1]<<8) | (buf[2]<<16);
  74                 if (reg == GSC_HWMON_TEMP && ui > 0x8000)
  75                         ui -= 0xffff;
  76                 if (ui == 0xffffff)
  77                         puts("invalid\n");
  78                 else
  79                         printf("%d\n", ui);
  80         }
  81 }
  82
  83 int gsc_info(int verbose)
  84 {
  85         unsigned char buf[16];
  86
  87         i2c_set_bus_num(0);
  88         if (gsc_i2c_read(GSC_SC_ADDR, 0, 1, buf, 16))
  89                 return CMD_RET_FAILURE;
  90
  91         printf("GSC:   v%d", buf[GSC_SC_FWVER]);
  92         printf(" 0x%04x", buf[GSC_SC_FWCRC] | buf[GSC_SC_FWCRC+1]<<8);
  93         printf(" WDT:%sabled", (buf[GSC_SC_CTRL1] & (1<<GSC_SC_CTRL1_WDEN))
  94                 ? "en" : "dis");
  95         if (buf[GSC_SC_STATUS] & (1 << GSC_SC_IRQ_WATCHDOG)) {
  96                 buf[GSC_SC_STATUS] &= ~(1 << GSC_SC_IRQ_WATCHDOG);
  97                 puts(" WDT_RESET");
  98                 gsc_i2c_write(GSC_SC_ADDR, GSC_SC_STATUS, 1,
  99                               &buf[GSC_SC_STATUS], 1);
 100         }
 101         if (!gsc_i2c_read(GSC_HWMON_ADDR, GSC_HWMON_TEMP, 1, buf, 2)) {
 102                 int ui = buf[0] | buf[1]<<8;
 103                 if (ui > 0x8000)
 104                         ui -= 0xffff;
 105                 printf(" board temp at %dC", ui / 10);
 106         }
 107         puts("\n");
 108         if (!verbose)
 109                 return CMD_RET_SUCCESS;
 110
 111         read_hwmon("Temp",     GSC_HWMON_TEMP, 2);
 112         read_hwmon("VIN",      GSC_HWMON_VIN, 3);
 113         read_hwmon("VBATT",    GSC_HWMON_VBATT, 3);
 114         read_hwmon("VDD_3P3",  GSC_HWMON_VDD_3P3, 3);
 115         read_hwmon("VDD_ARM",  GSC_HWMON_VDD_CORE, 3);
 116         read_hwmon("VDD_SOC",  GSC_HWMON_VDD_SOC, 3);
 117         read_hwmon("VDD_HIGH", GSC_HWMON_VDD_HIGH, 3);
 118         read_hwmon("VDD_DDR",  GSC_HWMON_VDD_DDR, 3);
 119         read_hwmon("VDD_5P0",  GSC_HWMON_VDD_5P0, 3);
 120         if (strncasecmp((const char*) ventana_info.model, "GW553", 5))
 121                 read_hwmon("VDD_2P5",  GSC_HWMON_VDD_2P5, 3);
 122         read_hwmon("VDD_1P8",  GSC_HWMON_VDD_1P8, 3);
 123         read_hwmon("VDD_IO2",  GSC_HWMON_VDD_IO2, 3);
 124         switch (ventana_info.model[3]) {
 125         case '1': /* GW51xx */
 126                 read_hwmon("VDD_IO3",  GSC_HWMON_VDD_IO4, 3); /* -C rev */
 127                 break;
 128         case '2': /* GW52xx */
 129                 break;
 130         case '3': /* GW53xx */
 131                 read_hwmon("VDD_IO4",  GSC_HWMON_VDD_IO4, 3); /* -C rev */
 132                 read_hwmon("VDD_GPS",  GSC_HWMON_VDD_IO3, 3);
 133                 break;
 134         case '4': /* GW54xx */
 135                 read_hwmon("VDD_IO3",  GSC_HWMON_VDD_IO4, 3); /* -C rev */
 136                 read_hwmon("VDD_GPS",  GSC_HWMON_VDD_IO3, 3);
 137                 break;
 138         case '5': /* GW55xx */
 139                 break;
 140         }
 141         return 0;
 142 }
 143
 144 /*
 145  *  The Gateworks System Controller implements a boot
 146  *  watchdog (always enabled) as a workaround for IMX6 boot related
 147  *  errata such as:
 148  *    ERR005768 - no fix scheduled
 149  *    ERR006282 - fixed in silicon r1.2
 150  *    ERR007117 - fixed in silicon r1.3
 151  *    ERR007220 - fixed in silicon r1.3
 152  *    ERR007926 - no fix scheduled
 153  *  see http://cache.freescale.com/files/32bit/doc/errata/IMX6DQCE.pdf
 154  *
 155  * Disable the boot watchdog
 156  */
 157 int gsc_boot_wd_disable(void)
 158 {
 159         u8 reg;
 160
 161         i2c_set_bus_num(CONFIG_I2C_GSC);
 162         if (!gsc_i2c_read(GSC_SC_ADDR, GSC_SC_CTRL1, 1, &reg, 1)) {
 163                 reg |= (1 << GSC_SC_CTRL1_WDDIS);
 164                 if (!gsc_i2c_write(GSC_SC_ADDR, GSC_SC_CTRL1, 1, &reg, 1))
 165                         return 0;
 166         }
 167         puts("Error: could not disable GSC Watchdog\n");
 168         return 1;
 169 }
 170
 171 #ifdef CONFIG_CMD_GSC
 172 static int do_gsc_sleep(cmd_tbl_t *cmdtp, int flag, int argc,
 173                         char * const argv[])
 174 {
 175         unsigned char reg;
 176         unsigned long secs = 0;
 177
 178         if (argc < 2)
 179                 return CMD_RET_USAGE;
 180
 181         secs = simple_strtoul(argv[1], NULL, 10);
 182         printf("GSC Sleeping for %ld seconds\n", secs);
 183
 184         i2c_set_bus_num(0);
 185         reg = (secs >> 24) & 0xff;
 186         if (gsc_i2c_write(GSC_SC_ADDR, 9, 1, &reg, 1))
 187                 goto error;
 188         reg = (secs >> 16) & 0xff;
 189         if (gsc_i2c_write(GSC_SC_ADDR, 8, 1, &reg, 1))
 190                 goto error;
 191         reg = (secs >> 8) & 0xff;
 192         if (gsc_i2c_write(GSC_SC_ADDR, 7, 1, &reg, 1))
 193                 goto error;
 194         reg = secs & 0xff;
 195         if (gsc_i2c_write(GSC_SC_ADDR, 6, 1, &reg, 1))
 196                 goto error;
 197         if (gsc_i2c_read(GSC_SC_ADDR, GSC_SC_CTRL1, 1, &reg, 1))
 198                 goto error;
 199         reg |= (1 << 2);
 200         if (gsc_i2c_write(GSC_SC_ADDR, GSC_SC_CTRL1, 1, &reg, 1))
 201                 goto error;
 202         reg &= ~(1 << 2);
 203         reg |= 0x3;
 204         if (gsc_i2c_write(GSC_SC_ADDR, GSC_SC_CTRL1, 1, &reg, 1))
 205                 goto error;
 206
 207         return CMD_RET_SUCCESS;
 208
 209 error:
 210         printf("i2c error\n");
 211         return CMD_RET_FAILURE;
 212 }
 213
 214 static int do_gsc_wd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 215 {
 216         unsigned char reg;
 217
 218         if (argc < 2)
 219                 return CMD_RET_USAGE;
 220
 221         if (strcasecmp(argv[1], "enable") == 0) {
 222                 int timeout = 0;
 223
 224                 if (argc > 2)
 225                         timeout = simple_strtoul(argv[2], NULL, 10);
 226                 i2c_set_bus_num(0);
 227                 if (gsc_i2c_read(GSC_SC_ADDR, GSC_SC_CTRL1, 1, &reg, 1))
 228                         return CMD_RET_FAILURE;
 229                 reg &= ~((1 << GSC_SC_CTRL1_WDEN) | (1 << GSC_SC_CTRL1_WDTIME));
 230                 if (timeout == 60)
 231                         reg |= (1 << GSC_SC_CTRL1_WDTIME);
 232                 else
 233                         timeout = 30;
 234                 reg |= (1 << GSC_SC_CTRL1_WDEN);
 235                 if (gsc_i2c_write(GSC_SC_ADDR, GSC_SC_CTRL1, 1, &reg, 1))
 236                         return CMD_RET_FAILURE;
 237                 printf("GSC Watchdog enabled with timeout=%d seconds\n",
 238                        timeout);
 239         } else if (strcasecmp(argv[1], "disable") == 0) {
 240                 i2c_set_bus_num(0);
 241                 if (gsc_i2c_read(GSC_SC_ADDR, GSC_SC_CTRL1, 1, &reg, 1))
 242                         return CMD_RET_FAILURE;
 243                 reg &= ~((1 << GSC_SC_CTRL1_WDEN) | (1 << GSC_SC_CTRL1_WDTIME));
 244                 if (gsc_i2c_write(GSC_SC_ADDR, GSC_SC_CTRL1, 1, &reg, 1))
 245                         return CMD_RET_FAILURE;
 246                 printf("GSC Watchdog disabled\n");
 247         } else {
 248                 return CMD_RET_USAGE;
 249         }
 250         return CMD_RET_SUCCESS;
 251 }
 252
 253 static int do_gsc(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 254 {
 255         if (argc < 2)
 256                 return gsc_info(1);
 257
 258         if (strcasecmp(argv[1], "wd") == 0)
 259                 return do_gsc_wd(cmdtp, flag, --argc, ++argv);
 260         else if (strcasecmp(argv[1], "sleep") == 0)
 261                 return do_gsc_sleep(cmdtp, flag, --argc, ++argv);
 262
 263         return CMD_RET_USAGE;
 264 }
 265
 266 U_BOOT_CMD(
 267         gsc, 4, 1, do_gsc, "GSC configuration",
 268         "[wd enable [30|60]]|[wd disable]|[sleep <secs>]\n"
 269         );
 270
 271 #endif /* CONFIG_CMD_GSC */