drivers/power/twl4030.c

   1 /*
   2  * Copyright (c) 2009 Wind River Systems, Inc.
   3  * Tom Rix <Tom.Rix at windriver.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  *
   7  * twl4030_power_reset_init is derived from code on omapzoom,
   8  * git://git.omapzoom.com/repo/u-boot.git
   9  *
  10  * Copyright (C) 2007-2009 Texas Instruments, Inc.
  11  *
  12  * twl4030_power_init is from cpu/omap3/common.c, power_init_r
  13  *
  14  * (C) Copyright 2004-2008
  15  * Texas Instruments, <www.ti.com>
  16  *
  17  * Author :
  18  *      Sunil Kumar <sunilsaini05 at gmail.com>
  19  *      Shashi Ranjan <shashiranjanmca05 at gmail.com>
  20  *
  21  * Derived from Beagle Board and 3430 SDP code by
  22  *      Richard Woodruff <r-woodruff2 at ti.com>
  23  *      Syed Mohammed Khasim <khasim at ti.com>
  24  */
  25
  26 #include <twl4030.h>
  27
  28 /*
  29  * Power Reset
  30  */
  31 void twl4030_power_reset_init(void)
  32 {
  33         u8 val = 0;
  34         if (twl4030_i2c_read_u8(TWL4030_CHIP_PM_MASTER,
  35                                 TWL4030_PM_MASTER_P1_SW_EVENTS, &val)) {
  36                 printf("Error:TWL4030: failed to read the power register\n");
  37                 printf("Could not initialize hardware reset\n");
  38         } else {
  39                 val |= TWL4030_PM_MASTER_SW_EVENTS_STOPON_PWRON;
  40                 if (twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER,
  41                                          TWL4030_PM_MASTER_P1_SW_EVENTS, val)) {
  42                         printf("Error:TWL4030: failed to write the power register\n");
  43                         printf("Could not initialize hardware reset\n");
  44                 }
  45         }
  46 }
  47
  48 /*
  49  * Set Device Group and Voltage
  50  */
  51 void twl4030_pmrecv_vsel_cfg(u8 vsel_reg, u8 vsel_val,
  52                                 u8 dev_grp, u8 dev_grp_sel)
  53 {
  54         int ret;
  55
  56         /* Select the Voltage */
  57         ret = twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER, vsel_reg,
  58                                    vsel_val);
  59         if (ret != 0) {
  60                 printf("Could not write vsel to reg %02x (%d)\n",
  61                         vsel_reg, ret);
  62                 return;
  63         }
  64
  65         /* Select the Device Group (enable the supply if dev_grp_sel != 0) */
  66         ret = twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER, dev_grp,
  67                                    dev_grp_sel);
  68         if (ret != 0)
  69                 printf("Could not write grp_sel to reg %02x (%d)\n",
  70                         dev_grp, ret);
  71 }
  72
  73 void twl4030_power_init(void)
  74 {
  75         /* set VAUX3 to 2.8V */
  76         twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VAUX3_DEDICATED,
  77                                 TWL4030_PM_RECEIVER_VAUX3_VSEL_28,
  78                                 TWL4030_PM_RECEIVER_VAUX3_DEV_GRP,
  79                                 TWL4030_PM_RECEIVER_DEV_GRP_P1);
  80
  81         /* set VPLL2 to 1.8V */
  82         twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VPLL2_DEDICATED,
  83                                 TWL4030_PM_RECEIVER_VPLL2_VSEL_18,
  84                                 TWL4030_PM_RECEIVER_VPLL2_DEV_GRP,
  85                                 TWL4030_PM_RECEIVER_DEV_GRP_ALL);
  86
  87         /* set VDAC to 1.8V */
  88         twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VDAC_DEDICATED,
  89                                 TWL4030_PM_RECEIVER_VDAC_VSEL_18,
  90                                 TWL4030_PM_RECEIVER_VDAC_DEV_GRP,
  91                                 TWL4030_PM_RECEIVER_DEV_GRP_P1);
  92 }
  93
  94 void twl4030_power_mmc_init(int dev_index)
  95 {
  96         if (dev_index == 0) {
  97                 /* Set VMMC1 to 3.15 Volts */
  98                 twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VMMC1_DEDICATED,
  99                                         TWL4030_PM_RECEIVER_VMMC1_VSEL_32,
 100                                         TWL4030_PM_RECEIVER_VMMC1_DEV_GRP,
 101                                         TWL4030_PM_RECEIVER_DEV_GRP_P1);
 102
 103                 mdelay(100);    /* ramp-up delay from Linux code */
 104         } else if (dev_index == 1) {
 105                 /* Set VMMC2 to 3.15 Volts */
 106                 twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VMMC2_DEDICATED,
 107                                         TWL4030_PM_RECEIVER_VMMC2_VSEL_32,
 108                                         TWL4030_PM_RECEIVER_VMMC2_DEV_GRP,
 109                                         TWL4030_PM_RECEIVER_DEV_GRP_P1);
 110
 111                 mdelay(100);    /* ramp-up delay from Linux code */
 112         }
 113 }