drivers/misc/fsl_pmic.c

   1 /*
   2  * (C) Copyright 2008-2009 Freescale Semiconductor, Inc.
   3  *
   4  * See file CREDITS for list of people who contributed to this
   5  * project.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of
  10  * the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  20  * MA 02111-1307 USA
  21  */
  22
  23 #include <config.h>
  24 #include <common.h>
  25 #include <asm/errno.h>
  26 #include <linux/types.h>
  27 #include <fsl_pmic.h>
  28
  29 static int check_param(u32 reg, u32 write)
  30 {
  31         if (reg > 63 || write > 1) {
  32                 printf("<reg num> = %d is invalid. Should be less then 63\n",
  33                         reg);
  34                 return -1;
  35         }
  36
  37         return 0;
  38 }
  39
  40 #ifdef CONFIG_FSL_PMIC_I2C
  41 #include <i2c.h>
  42
  43 u32 pmic_reg(u32 reg, u32 val, u32 write)
  44 {
  45         unsigned char buf[4] = { 0 };
  46         u32 ret_val = 0;
  47
  48         if (check_param(reg, write))
  49                 return -1;
  50
  51         if (write) {
  52                 buf[0] = (val >> 16) & 0xff;
  53                 buf[1] = (val >> 8) & 0xff;
  54                 buf[2] = (val) & 0xff;
  55                 if (i2c_write(CONFIG_SYS_FSL_PMIC_I2C_ADDR, reg, 1, buf, 3))
  56                         return -1;
  57         } else {
  58                 if (i2c_read(CONFIG_SYS_FSL_PMIC_I2C_ADDR, reg, 1, buf, 3))
  59                         return -1;
  60                 ret_val = buf[0] << 16 | buf[1] << 8 | buf[2];
  61         }
  62
  63         return ret_val;
  64 }
  65 #else /* SPI interface */
  66 #include <spi.h>
  67 static struct spi_slave *slave;
  68
  69 struct spi_slave *pmic_spi_probe(void)
  70 {
  71         return spi_setup_slave(CONFIG_FSL_PMIC_BUS,
  72                 CONFIG_FSL_PMIC_CS,
  73                 CONFIG_FSL_PMIC_CLK,
  74                 CONFIG_FSL_PMIC_MODE);
  75 }
  76
  77 void pmic_spi_free(struct spi_slave *slave)
  78 {
  79         if (slave)
  80                 spi_free_slave(slave);
  81 }
  82
  83 u32 pmic_reg(u32 reg, u32 val, u32 write)
  84 {
  85         u32 pmic_tx, pmic_rx;
  86         u32 tmp;
  87
  88         if (!slave) {
  89                 slave = pmic_spi_probe();
  90
  91                 if (!slave)
  92                         return -1;
  93         }
  94
  95         if (check_param(reg, write))
  96                 return -1;
  97
  98         if (spi_claim_bus(slave))
  99                 return -1;
 100
 101         pmic_tx = (write << 31) | (reg << 25) | (val & 0x00FFFFFF);
 102
 103         tmp = cpu_to_be32(pmic_tx);
 104
 105         if (spi_xfer(slave, 4 << 3, &tmp, &pmic_rx,
 106                         SPI_XFER_BEGIN | SPI_XFER_END)) {
 107                 spi_release_bus(slave);
 108                 return -1;
 109         }
 110
 111         if (write) {
 112                 pmic_tx &= ~(1 << 31);
 113                 tmp = cpu_to_be32(pmic_tx);
 114                 if (spi_xfer(slave, 4 << 3, &tmp, &pmic_rx,
 115                         SPI_XFER_BEGIN | SPI_XFER_END)) {
 116                         spi_release_bus(slave);
 117                         return -1;
 118                 }
 119         }
 120
 121         spi_release_bus(slave);
 122         return cpu_to_be32(pmic_rx);
 123 }
 124 #endif
 125
 126 void pmic_reg_write(u32 reg, u32 value)
 127 {
 128         pmic_reg(reg, value, 1);
 129 }
 130
 131 u32 pmic_reg_read(u32 reg)
 132 {
 133         return pmic_reg(reg, 0, 0);
 134 }
 135
 136 void pmic_show_pmic_info(void)
 137 {
 138         u32 rev_id;
 139
 140         rev_id = pmic_reg_read(REG_IDENTIFICATION);
 141         printf("PMIC ID: 0x%08x [Rev: ", rev_id);
 142         switch (rev_id & 0x1F) {
 143         case 0x1:
 144                 puts("1.0");
 145                 break;
 146         case 0x9:
 147                 puts("1.1");
 148                 break;
 149         case 0xA:
 150                 puts("1.2");
 151                 break;
 152         case 0x10:
 153                 puts("2.0");
 154                 break;
 155         case 0x11:
 156                 puts("2.1");
 157                 break;
 158         case 0x18:
 159                 puts("3.0");
 160                 break;
 161         case 0x19:
 162                 puts("3.1");
 163                 break;
 164         case 0x1A:
 165                 puts("3.2");
 166                 break;
 167         case 0x2:
 168                 puts("3.2A");
 169                 break;
 170         case 0x1B:
 171                 puts("3.3");
 172                 break;
 173         case 0x1D:
 174                 puts("3.5");
 175                 break;
 176         default:
 177                 puts("unknown");
 178                 break;
 179         }
 180         puts("]\n");
 181 }
 182
 183 static void pmic_dump(int numregs)
 184 {
 185         u32 val;
 186         int i;
 187
 188         pmic_show_pmic_info();
 189         for (i = 0; i < numregs; i++) {
 190                 val = pmic_reg_read(i);
 191                 if (!(i % 8))
 192                         printf ("\n0x%02x: ", i);
 193                 printf("%08x ", val);
 194         }
 195         puts("\n");
 196 }
 197
 198 int do_pmic(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 199 {
 200         char *cmd;
 201         int nregs;
 202         u32 val;
 203
 204         /* at least two arguments please */
 205         if (argc < 2)
 206                 return cmd_usage(cmdtp);
 207
 208         cmd = argv[1];
 209         if (strcmp(cmd, "dump") == 0) {
 210                 if (argc < 3)
 211                         return cmd_usage(cmdtp);
 212
 213                 nregs = simple_strtoul(argv[2], NULL, 16);
 214                 pmic_dump(nregs);
 215                 return 0;
 216         }
 217         if (strcmp(cmd, "write") == 0) {
 218                 if (argc < 4)
 219                         return cmd_usage(cmdtp);
 220
 221                 nregs = simple_strtoul(argv[2], NULL, 16);
 222                 val = simple_strtoul(argv[3], NULL, 16);
 223                 pmic_reg_write(nregs, val);
 224                 return 0;
 225         }
 226         /* No subcommand found */
 227         return 1;
 228 }
 229
 230 U_BOOT_CMD(
 231         pmic,   CONFIG_SYS_MAXARGS, 1, do_pmic,
 232         "Freescale PMIC (Atlas)",
 233         "dump [numregs] dump registers\n"
 234         "pmic write <reg> <value> - write register"
 235 );