drivers/power/twl4030.c

   1 /*
   2  * Copyright (c) 2009 Wind River Systems, Inc.
   3  * Tom Rix <Tom.Rix at windriver.com>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation; either version 2 of
   8  * the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  18  * MA 02111-1307 USA
  19  *
  20  * twl4030_power_reset_init is derived from code on omapzoom,
  21  * git://git.omapzoom.com/repo/u-boot.git
  22  *
  23  * Copyright (C) 2007-2009 Texas Instruments, Inc.
  24  *
  25  * twl4030_power_init is from cpu/omap3/common.c, power_init_r
  26  *
  27  * (C) Copyright 2004-2008
  28  * Texas Instruments, <www.ti.com>
  29  *
  30  * Author :
  31  *      Sunil Kumar <sunilsaini05 at gmail.com>
  32  *      Shashi Ranjan <shashiranjanmca05 at gmail.com>
  33  *
  34  * Derived from Beagle Board and 3430 SDP code by
  35  *      Richard Woodruff <r-woodruff2 at ti.com>
  36  *      Syed Mohammed Khasim <khasim at ti.com>
  37  *
  38  */
  39
  40 #include <twl4030.h>
  41
  42 /*
  43  * Power Reset
  44  */
  45 void twl4030_power_reset_init(void)
  46 {
  47         u8 val = 0;
  48         if (twl4030_i2c_read_u8(TWL4030_CHIP_PM_MASTER,
  49                                 TWL4030_PM_MASTER_P1_SW_EVENTS, &val)) {
  50                 printf("Error:TWL4030: failed to read the power register\n");
  51                 printf("Could not initialize hardware reset\n");
  52         } else {
  53                 val |= TWL4030_PM_MASTER_SW_EVENTS_STOPON_PWRON;
  54                 if (twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER,
  55                                          TWL4030_PM_MASTER_P1_SW_EVENTS, val)) {
  56                         printf("Error:TWL4030: failed to write the power register\n");
  57                         printf("Could not initialize hardware reset\n");
  58                 }
  59         }
  60 }
  61
  62 /*
  63  * Set Device Group and Voltage
  64  */
  65 void twl4030_pmrecv_vsel_cfg(u8 vsel_reg, u8 vsel_val,
  66                                 u8 dev_grp, u8 dev_grp_sel)
  67 {
  68         int ret;
  69
  70         /* Select the Voltage */
  71         ret = twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER, vsel_reg,
  72                                    vsel_val);
  73         if (ret != 0) {
  74                 printf("Could not write vsel to reg %02x (%d)\n",
  75                         vsel_reg, ret);
  76                 return;
  77         }
  78
  79         /* Select the Device Group (enable the supply if dev_grp_sel != 0) */
  80         ret = twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER, dev_grp,
  81                                    dev_grp_sel);
  82         if (ret != 0)
  83                 printf("Could not write grp_sel to reg %02x (%d)\n",
  84                         dev_grp, ret);
  85 }
  86
  87 void twl4030_power_init(void)
  88 {
  89         /* set VAUX3 to 2.8V */
  90         twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VAUX3_DEDICATED,
  91                                 TWL4030_PM_RECEIVER_VAUX3_VSEL_28,
  92                                 TWL4030_PM_RECEIVER_VAUX3_DEV_GRP,
  93                                 TWL4030_PM_RECEIVER_DEV_GRP_P1);
  94
  95         /* set VPLL2 to 1.8V */
  96         twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VPLL2_DEDICATED,
  97                                 TWL4030_PM_RECEIVER_VPLL2_VSEL_18,
  98                                 TWL4030_PM_RECEIVER_VPLL2_DEV_GRP,
  99                                 TWL4030_PM_RECEIVER_DEV_GRP_ALL);
 100
 101         /* set VDAC to 1.8V */
 102         twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VDAC_DEDICATED,
 103                                 TWL4030_PM_RECEIVER_VDAC_VSEL_18,
 104                                 TWL4030_PM_RECEIVER_VDAC_DEV_GRP,
 105                                 TWL4030_PM_RECEIVER_DEV_GRP_P1);
 106 }
 107
 108 void twl4030_power_mmc_init(void)
 109 {
 110         /* Set VMMC1 to 3.15 Volts */
 111         twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VMMC1_DEDICATED,
 112                                 TWL4030_PM_RECEIVER_VMMC1_VSEL_32,
 113                                 TWL4030_PM_RECEIVER_VMMC1_DEV_GRP,
 114                                 TWL4030_PM_RECEIVER_DEV_GRP_P1);
 115 }