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bootloader/u-boot_2015_04/drivers/power/twl4030.c 3.06 KB
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  /*
   * Copyright (c) 2009 Wind River Systems, Inc.
   * Tom Rix <Tom.Rix at windriver.com>
   *
   * SPDX-License-Identifier:	GPL-2.0+
   *
   * twl4030_power_reset_init is derived from code on omapzoom,
   * git://git.omapzoom.com/repo/u-boot.git
   *
   * Copyright (C) 2007-2009 Texas Instruments, Inc.
   *
   * twl4030_power_init is from cpu/omap3/common.c, power_init_r
   *
   * (C) Copyright 2004-2008
   * Texas Instruments, <www.ti.com>
   *
   * Author :
   *	Sunil Kumar <sunilsaini05 at gmail.com>
   *	Shashi Ranjan <shashiranjanmca05 at gmail.com>
   *
   * Derived from Beagle Board and 3430 SDP code by
   *	Richard Woodruff <r-woodruff2 at ti.com>
   *	Syed Mohammed Khasim <khasim at ti.com>
   */
  
  #include <twl4030.h>
  
  /*
   * Power Reset
   */
  void twl4030_power_reset_init(void)
  {
  	u8 val = 0;
  	if (twl4030_i2c_read_u8(TWL4030_CHIP_PM_MASTER,
  				TWL4030_PM_MASTER_P1_SW_EVENTS, &val)) {
  		printf("Error:TWL4030: failed to read the power register
  ");
  		printf("Could not initialize hardware reset
  ");
  	} else {
  		val |= TWL4030_PM_MASTER_SW_EVENTS_STOPON_PWRON;
  		if (twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER,
  					 TWL4030_PM_MASTER_P1_SW_EVENTS, val)) {
  			printf("Error:TWL4030: failed to write the power register
  ");
  			printf("Could not initialize hardware reset
  ");
  		}
  	}
  }
  
  /*
   * Set Device Group and Voltage
   */
  void twl4030_pmrecv_vsel_cfg(u8 vsel_reg, u8 vsel_val,
  				u8 dev_grp, u8 dev_grp_sel)
  {
  	int ret;
  
  	/* Select the Voltage */
  	ret = twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER, vsel_reg,
  				   vsel_val);
  	if (ret != 0) {
  		printf("Could not write vsel to reg %02x (%d)
  ",
  			vsel_reg, ret);
  		return;
  	}
  
  	/* Select the Device Group (enable the supply if dev_grp_sel != 0) */
  	ret = twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER, dev_grp,
  				   dev_grp_sel);
  	if (ret != 0)
  		printf("Could not write grp_sel to reg %02x (%d)
  ",
  			dev_grp, ret);
  }
  
  void twl4030_power_init(void)
  {
  	/* set VAUX3 to 2.8V */
  	twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VAUX3_DEDICATED,
  				TWL4030_PM_RECEIVER_VAUX3_VSEL_28,
  				TWL4030_PM_RECEIVER_VAUX3_DEV_GRP,
  				TWL4030_PM_RECEIVER_DEV_GRP_P1);
  
  	/* set VPLL2 to 1.8V */
  	twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VPLL2_DEDICATED,
  				TWL4030_PM_RECEIVER_VPLL2_VSEL_18,
  				TWL4030_PM_RECEIVER_VPLL2_DEV_GRP,
  				TWL4030_PM_RECEIVER_DEV_GRP_ALL);
  
  	/* set VDAC to 1.8V */
  	twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VDAC_DEDICATED,
  				TWL4030_PM_RECEIVER_VDAC_VSEL_18,
  				TWL4030_PM_RECEIVER_VDAC_DEV_GRP,
  				TWL4030_PM_RECEIVER_DEV_GRP_P1);
  }
  
  void twl4030_power_mmc_init(int dev_index)
  {
  	if (dev_index == 0) {
  		/* Set VMMC1 to 3.15 Volts */
  		twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VMMC1_DEDICATED,
  					TWL4030_PM_RECEIVER_VMMC1_VSEL_32,
  					TWL4030_PM_RECEIVER_VMMC1_DEV_GRP,
  					TWL4030_PM_RECEIVER_DEV_GRP_P1);
  
  		mdelay(100);	/* ramp-up delay from Linux code */
  	} else if (dev_index == 1) {
  		/* Set VMMC2 to 3.15 Volts */
  		twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VMMC2_DEDICATED,
  					TWL4030_PM_RECEIVER_VMMC2_VSEL_32,
  					TWL4030_PM_RECEIVER_VMMC2_DEV_GRP,
  					TWL4030_PM_RECEIVER_DEV_GRP_P1);
  
  		mdelay(100);	/* ramp-up delay from Linux code */
  	}
  }