--- /dev/null
+/*
+ * OMAP3/OMAP4 Voltage Management Routines
+ *
+ * Author: Thara Gopinath <thara@ti.com>
+ *
+ * Copyright (C) 2007 Texas Instruments, Inc.
+ * Rajendra Nayak <rnayak@ti.com>
+ * Lesly A M <x0080970@ti.com>
+ *
+ * Copyright (C) 2008 Nokia Corporation
+ * Kalle Jokiniemi
+ *
+ * Copyright (C) 2010 Texas Instruments, Inc.
+ * Thara Gopinath <thara@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/debugfs.h>
+#include <linux/slab.h>
+
+#include <plat/common.h>
+#include <plat/voltage.h>
+
+#include "prm-regbits-34xx.h"
+#include "control.h"
+
+#define VP_IDLE_TIMEOUT 200
+#define VP_TRANXDONE_TIMEOUT 300
+#define VOLTAGE_DIR_SIZE 16
+
+/* Voltage processor register offsets */
+struct vp_reg_offs {
+ u8 vpconfig;
+ u8 vstepmin;
+ u8 vstepmax;
+ u8 vlimitto;
+ u8 vstatus;
+ u8 voltage;
+};
+
+/* Voltage Processor bit field values, shifts and masks */
+struct vp_reg_val {
+ /* PRM module */
+ u16 prm_mod;
+ /* VPx_VPCONFIG */
+ u32 vpconfig_erroroffset;
+ u16 vpconfig_errorgain;
+ u32 vpconfig_errorgain_mask;
+ u8 vpconfig_errorgain_shift;
+ u32 vpconfig_initvoltage_mask;
+ u8 vpconfig_initvoltage_shift;
+ u32 vpconfig_timeouten;
+ u32 vpconfig_initvdd;
+ u32 vpconfig_forceupdate;
+ u32 vpconfig_vpenable;
+ /* VPx_VSTEPMIN */
+ u8 vstepmin_stepmin;
+ u16 vstepmin_smpswaittimemin;
+ u8 vstepmin_stepmin_shift;
+ u8 vstepmin_smpswaittimemin_shift;
+ /* VPx_VSTEPMAX */
+ u8 vstepmax_stepmax;
+ u16 vstepmax_smpswaittimemax;
+ u8 vstepmax_stepmax_shift;
+ u8 vstepmax_smpswaittimemax_shift;
+ /* VPx_VLIMITTO */
+ u8 vlimitto_vddmin;
+ u8 vlimitto_vddmax;
+ u16 vlimitto_timeout;
+ u8 vlimitto_vddmin_shift;
+ u8 vlimitto_vddmax_shift;
+ u8 vlimitto_timeout_shift;
+ /* PRM_IRQSTATUS*/
+ u32 tranxdone_status;
+};
+
+/* Voltage controller registers and offsets */
+struct vc_reg_info {
+ /* PRM module */
+ u16 prm_mod;
+ /* VC register offsets */
+ u8 smps_sa_reg;
+ u8 smps_volra_reg;
+ u8 bypass_val_reg;
+ u8 cmdval_reg;
+ u8 voltsetup_reg;
+ /*VC_SMPS_SA*/
+ u8 smps_sa_shift;
+ u32 smps_sa_mask;
+ /* VC_SMPS_VOL_RA */
+ u8 smps_volra_shift;
+ u32 smps_volra_mask;
+ /* VC_BYPASS_VAL */
+ u8 data_shift;
+ u8 slaveaddr_shift;
+ u8 regaddr_shift;
+ u32 valid;
+ /* VC_CMD_VAL */
+ u8 cmd_on_shift;
+ u8 cmd_onlp_shift;
+ u8 cmd_ret_shift;
+ u8 cmd_off_shift;
+ u32 cmd_on_mask;
+ /* PRM_VOLTSETUP */
+ u8 voltsetup_shift;
+ u32 voltsetup_mask;
+};
+
+/**
+ * omap_vdd_info - Per Voltage Domain info
+ *
+ * @volt_data : voltage table having the distinct voltages supported
+ * by the domain and other associated per voltage data.
+ * @pmic_info : pmic specific parameters which should be populted by
+ * the pmic drivers.
+ * @vp_offs : structure containing the offsets for various
+ * vp registers
+ * @vp_reg : the register values, shifts, masks for various
+ * vp registers
+ * @vc_reg : structure containing various various vc registers,
+ * shifts, masks etc.
+ * @voltdm : pointer to the voltage domain structure
+ * @debug_dir : debug directory for this voltage domain.
+ * @curr_volt : current voltage for this vdd.
+ * @ocp_mod : The prm module for accessing the prm irqstatus reg.
+ * @prm_irqst_reg : prm irqstatus register.
+ * @vp_enabled : flag to keep track of whether vp is enabled or not
+ * @volt_scale : API to scale the voltage of the vdd.
+ */
+struct omap_vdd_info {
+ struct omap_volt_data *volt_data;
+ struct omap_volt_pmic_info *pmic_info;
+ struct vp_reg_offs vp_offs;
+ struct vp_reg_val vp_reg;
+ struct vc_reg_info vc_reg;
+ struct voltagedomain voltdm;
+ struct dentry *debug_dir;
+ u32 curr_volt;
+ u16 ocp_mod;
+ u8 prm_irqst_reg;
+ bool vp_enabled;
+ u32 (*read_reg) (u16 mod, u8 offset);
+ void (*write_reg) (u32 val, u16 mod, u8 offset);
+ int (*volt_scale) (struct omap_vdd_info *vdd,
+ unsigned long target_volt);
+};
+
+static struct omap_vdd_info *vdd_info;
+/*
+ * Number of scalable voltage domains.
+ */
+static int nr_scalable_vdd;
+
+/* OMAP3 VDD sturctures */
+static struct omap_vdd_info omap3_vdd_info[] = {
+ {
+ .vp_offs = {
+ .vpconfig = OMAP3_PRM_VP1_CONFIG_OFFSET,
+ .vstepmin = OMAP3_PRM_VP1_VSTEPMIN_OFFSET,
+ .vstepmax = OMAP3_PRM_VP1_VSTEPMAX_OFFSET,
+ .vlimitto = OMAP3_PRM_VP1_VLIMITTO_OFFSET,
+ .vstatus = OMAP3_PRM_VP1_STATUS_OFFSET,
+ .voltage = OMAP3_PRM_VP1_VOLTAGE_OFFSET,
+ },
+ .voltdm = {
+ .name = "mpu",
+ },
+ },
+ {
+ .vp_offs = {
+ .vpconfig = OMAP3_PRM_VP2_CONFIG_OFFSET,
+ .vstepmin = OMAP3_PRM_VP2_VSTEPMIN_OFFSET,
+ .vstepmax = OMAP3_PRM_VP2_VSTEPMAX_OFFSET,
+ .vlimitto = OMAP3_PRM_VP2_VLIMITTO_OFFSET,
+ .vstatus = OMAP3_PRM_VP2_STATUS_OFFSET,
+ .voltage = OMAP3_PRM_VP2_VOLTAGE_OFFSET,
+ },
+ .voltdm = {
+ .name = "core",
+ },
+ },
+};
+
+#define OMAP3_NR_SCALABLE_VDD ARRAY_SIZE(omap3_vdd_info)
+
+/*
+ * Structures containing OMAP3430/OMAP3630 voltage supported and various
+ * voltage dependent data for each VDD.
+ */
+#define VOLT_DATA_DEFINE(_v_nom, _efuse_offs, _errminlimit, _errgain) \
+{ \
+ .volt_nominal = _v_nom, \
+ .sr_efuse_offs = _efuse_offs, \
+ .sr_errminlimit = _errminlimit, \
+ .vp_errgain = _errgain \
+}
+
+/* VDD1 */
+static struct omap_volt_data omap34xx_vddmpu_volt_data[] = {
+ VOLT_DATA_DEFINE(OMAP3430_VDD_MPU_OPP1_UV, OMAP343X_CONTROL_FUSE_OPP1_VDD1, 0xf4, 0x0c),
+ VOLT_DATA_DEFINE(OMAP3430_VDD_MPU_OPP2_UV, OMAP343X_CONTROL_FUSE_OPP2_VDD1, 0xf4, 0x0c),
+ VOLT_DATA_DEFINE(OMAP3430_VDD_MPU_OPP3_UV, OMAP343X_CONTROL_FUSE_OPP3_VDD1, 0xf9, 0x18),
+ VOLT_DATA_DEFINE(OMAP3430_VDD_MPU_OPP4_UV, OMAP343X_CONTROL_FUSE_OPP4_VDD1, 0xf9, 0x18),
+ VOLT_DATA_DEFINE(OMAP3430_VDD_MPU_OPP5_UV, OMAP343X_CONTROL_FUSE_OPP5_VDD1, 0xf9, 0x18),
+ VOLT_DATA_DEFINE(0, 0, 0, 0),
+};
+
+static struct omap_volt_data omap36xx_vddmpu_volt_data[] = {
+ VOLT_DATA_DEFINE(OMAP3630_VDD_MPU_OPP50_UV, OMAP3630_CONTROL_FUSE_OPP50_VDD1, 0xf4, 0x0c),
+ VOLT_DATA_DEFINE(OMAP3630_VDD_MPU_OPP100_UV, OMAP3630_CONTROL_FUSE_OPP100_VDD1, 0xf9, 0x16),
+ VOLT_DATA_DEFINE(OMAP3630_VDD_MPU_OPP120_UV, OMAP3630_CONTROL_FUSE_OPP120_VDD1, 0xfa, 0x23),
+ VOLT_DATA_DEFINE(OMAP3630_VDD_MPU_OPP1G_UV, OMAP3630_CONTROL_FUSE_OPP1G_VDD1, 0xfa, 0x27),
+ VOLT_DATA_DEFINE(0, 0, 0, 0),
+};
+
+/* VDD2 */
+static struct omap_volt_data omap34xx_vddcore_volt_data[] = {
+ VOLT_DATA_DEFINE(OMAP3430_VDD_CORE_OPP1_UV, OMAP343X_CONTROL_FUSE_OPP1_VDD2, 0xf4, 0x0c),
+ VOLT_DATA_DEFINE(OMAP3430_VDD_CORE_OPP2_UV, OMAP343X_CONTROL_FUSE_OPP2_VDD2, 0xf4, 0x0c),
+ VOLT_DATA_DEFINE(OMAP3430_VDD_CORE_OPP3_UV, OMAP343X_CONTROL_FUSE_OPP3_VDD2, 0xf9, 0x18),
+ VOLT_DATA_DEFINE(0, 0, 0, 0),
+};
+
+static struct omap_volt_data omap36xx_vddcore_volt_data[] = {
+ VOLT_DATA_DEFINE(OMAP3630_VDD_CORE_OPP50_UV, OMAP3630_CONTROL_FUSE_OPP50_VDD2, 0xf4, 0x0c),
+ VOLT_DATA_DEFINE(OMAP3630_VDD_CORE_OPP100_UV, OMAP3630_CONTROL_FUSE_OPP100_VDD2, 0xf9, 0x16),
+ VOLT_DATA_DEFINE(0, 0, 0, 0),
+};
+
+static struct dentry *voltage_dir;
+
+/* Init function pointers */
+static void (*vc_init) (struct omap_vdd_info *vdd);
+static int (*vdd_data_configure) (struct omap_vdd_info *vdd);
+
+static u32 omap3_voltage_read_reg(u16 mod, u8 offset)
+{
+ return omap2_prm_read_mod_reg(mod, offset);
+}
+
+static void omap3_voltage_write_reg(u32 val, u16 mod, u8 offset)
+{
+ omap2_prm_write_mod_reg(val, mod, offset);
+}
+
+static void vp_latch_vsel(struct omap_vdd_info *vdd)
+{
+ u32 vpconfig;
+ u16 mod;
+ unsigned long uvdc;
+ char vsel;
+
+ uvdc = omap_voltage_get_nom_volt(&vdd->voltdm);
+ if (!uvdc) {
+ pr_warning("%s: unable to find current voltage for vdd_%s\n",
+ __func__, vdd->voltdm.name);
+ return;
+ }
+
+ if (!vdd->pmic_info || !vdd->pmic_info->uv_to_vsel) {
+ pr_warning("%s: PMIC function to convert voltage in uV to"
+ " vsel not registered\n", __func__);
+ return;
+ }
+
+ mod = vdd->vp_reg.prm_mod;
+
+ vsel = vdd->pmic_info->uv_to_vsel(uvdc);
+
+ vpconfig = vdd->read_reg(mod, vdd->vp_offs.vpconfig);
+ vpconfig &= ~(vdd->vp_reg.vpconfig_initvoltage_mask |
+ vdd->vp_reg.vpconfig_initvdd);
+ vpconfig |= vsel << vdd->vp_reg.vpconfig_initvoltage_shift;
+
+ vdd->write_reg(vpconfig, mod, vdd->vp_offs.vpconfig);
+
+ /* Trigger initVDD value copy to voltage processor */
+ vdd->write_reg((vpconfig | vdd->vp_reg.vpconfig_initvdd), mod,
+ vdd->vp_offs.vpconfig);
+
+ /* Clear initVDD copy trigger bit */
+ vdd->write_reg(vpconfig, mod, vdd->vp_offs.vpconfig);
+}
+
+/* Generic voltage init functions */
+static void __init vp_init(struct omap_vdd_info *vdd)
+{
+ u32 vp_val;
+ u16 mod;
+
+ if (!vdd->read_reg || !vdd->write_reg) {
+ pr_err("%s: No read/write API for accessing vdd_%s regs\n",
+ __func__, vdd->voltdm.name);
+ return;
+ }
+
+ mod = vdd->vp_reg.prm_mod;
+
+ vp_val = vdd->vp_reg.vpconfig_erroroffset |
+ (vdd->vp_reg.vpconfig_errorgain <<
+ vdd->vp_reg.vpconfig_errorgain_shift) |
+ vdd->vp_reg.vpconfig_timeouten;
+ vdd->write_reg(vp_val, mod, vdd->vp_offs.vpconfig);
+
+ vp_val = ((vdd->vp_reg.vstepmin_smpswaittimemin <<
+ vdd->vp_reg.vstepmin_smpswaittimemin_shift) |
+ (vdd->vp_reg.vstepmin_stepmin <<
+ vdd->vp_reg.vstepmin_stepmin_shift));
+ vdd->write_reg(vp_val, mod, vdd->vp_offs.vstepmin);
+
+ vp_val = ((vdd->vp_reg.vstepmax_smpswaittimemax <<
+ vdd->vp_reg.vstepmax_smpswaittimemax_shift) |
+ (vdd->vp_reg.vstepmax_stepmax <<
+ vdd->vp_reg.vstepmax_stepmax_shift));
+ vdd->write_reg(vp_val, mod, vdd->vp_offs.vstepmax);
+
+ vp_val = ((vdd->vp_reg.vlimitto_vddmax <<
+ vdd->vp_reg.vlimitto_vddmax_shift) |
+ (vdd->vp_reg.vlimitto_vddmin <<
+ vdd->vp_reg.vlimitto_vddmin_shift) |
+ (vdd->vp_reg.vlimitto_timeout <<
+ vdd->vp_reg.vlimitto_timeout_shift));
+ vdd->write_reg(vp_val, mod, vdd->vp_offs.vlimitto);
+}
+
+static void __init vdd_debugfs_init(struct omap_vdd_info *vdd)
+{
+ char *name;
+
+ name = kzalloc(VOLTAGE_DIR_SIZE, GFP_KERNEL);
+ if (!name) {
+ pr_warning("%s: Unable to allocate memory for debugfs"
+ " directory name for vdd_%s",
+ __func__, vdd->voltdm.name);
+ return;
+ }
+ strcpy(name, "vdd_");
+ strcat(name, vdd->voltdm.name);
+
+ vdd->debug_dir = debugfs_create_dir(name, voltage_dir);
+ if (IS_ERR(vdd->debug_dir)) {
+ pr_warning("%s: Unable to create debugfs directory for"
+ " vdd_%s\n", __func__, vdd->voltdm.name);
+ vdd->debug_dir = NULL;
+ }
+}
+
+/* Voltage scale and accessory APIs */
+static int _pre_volt_scale(struct omap_vdd_info *vdd,
+ unsigned long target_volt, u8 *target_vsel, u8 *current_vsel)
+{
+ struct omap_volt_data *volt_data;
+ u32 vc_cmdval, vp_errgain_val;
+ u16 vp_mod, vc_mod;
+
+ /* Check if suffiecient pmic info is available for this vdd */
+ if (!vdd->pmic_info) {
+ pr_err("%s: Insufficient pmic info to scale the vdd_%s\n",
+ __func__, vdd->voltdm.name);
+ return -EINVAL;
+ }
+
+ if (!vdd->pmic_info->uv_to_vsel) {
+ pr_err("%s: PMIC function to convert voltage in uV to"
+ "vsel not registered. Hence unable to scale voltage"
+ "for vdd_%s\n", __func__, vdd->voltdm.name);
+ return -ENODATA;
+ }
+
+ if (!vdd->read_reg || !vdd->write_reg) {
+ pr_err("%s: No read/write API for accessing vdd_%s regs\n",
+ __func__, vdd->voltdm.name);
+ return -EINVAL;
+ }
+
+ vp_mod = vdd->vp_reg.prm_mod;
+ vc_mod = vdd->vc_reg.prm_mod;
+
+ /* Get volt_data corresponding to target_volt */
+ volt_data = omap_voltage_get_voltdata(&vdd->voltdm, target_volt);
+ if (IS_ERR(volt_data))
+ volt_data = NULL;
+
+ *target_vsel = vdd->pmic_info->uv_to_vsel(target_volt);
+ *current_vsel = vdd->read_reg(vp_mod, vdd->vp_offs.voltage);
+
+ /* Setting the ON voltage to the new target voltage */
+ vc_cmdval = vdd->read_reg(vc_mod, vdd->vc_reg.cmdval_reg);
+ vc_cmdval &= ~vdd->vc_reg.cmd_on_mask;
+ vc_cmdval |= (*target_vsel << vdd->vc_reg.cmd_on_shift);
+ vdd->write_reg(vc_cmdval, vc_mod, vdd->vc_reg.cmdval_reg);
+
+ /* Setting vp errorgain based on the voltage */
+ if (volt_data) {
+ vp_errgain_val = vdd->read_reg(vp_mod,
+ vdd->vp_offs.vpconfig);
+ vdd->vp_reg.vpconfig_errorgain = volt_data->vp_errgain;
+ vp_errgain_val &= ~vdd->vp_reg.vpconfig_errorgain_mask;
+ vp_errgain_val |= vdd->vp_reg.vpconfig_errorgain <<
+ vdd->vp_reg.vpconfig_errorgain_shift;
+ vdd->write_reg(vp_errgain_val, vp_mod,
+ vdd->vp_offs.vpconfig);
+ }
+
+ return 0;
+}
+
+static void _post_volt_scale(struct omap_vdd_info *vdd,
+ unsigned long target_volt, u8 target_vsel, u8 current_vsel)
+{
+ u32 smps_steps = 0, smps_delay = 0;
+
+ smps_steps = abs(target_vsel - current_vsel);
+ /* SMPS slew rate / step size. 2us added as buffer. */
+ smps_delay = ((smps_steps * vdd->pmic_info->step_size) /
+ vdd->pmic_info->slew_rate) + 2;
+ udelay(smps_delay);
+
+ vdd->curr_volt = target_volt;
+}
+
+/* vc_bypass_scale_voltage - VC bypass method of voltage scaling */
+static int vc_bypass_scale_voltage(struct omap_vdd_info *vdd,
+ unsigned long target_volt)
+{
+ u32 loop_cnt = 0, retries_cnt = 0;
+ u32 vc_valid, vc_bypass_val_reg, vc_bypass_value;
+ u16 mod;
+ u8 target_vsel, current_vsel;
+ int ret;
+
+ ret = _pre_volt_scale(vdd, target_volt, &target_vsel, ¤t_vsel);
+ if (ret)
+ return ret;
+
+ mod = vdd->vc_reg.prm_mod;
+
+ vc_valid = vdd->vc_reg.valid;
+ vc_bypass_val_reg = vdd->vc_reg.bypass_val_reg;
+ vc_bypass_value = (target_vsel << vdd->vc_reg.data_shift) |
+ (vdd->pmic_info->pmic_reg <<
+ vdd->vc_reg.regaddr_shift) |
+ (vdd->pmic_info->i2c_slave_addr <<
+ vdd->vc_reg.slaveaddr_shift);
+
+ vdd->write_reg(vc_bypass_value, mod, vc_bypass_val_reg);
+ vdd->write_reg(vc_bypass_value | vc_valid, mod, vc_bypass_val_reg);
+
+ vc_bypass_value = vdd->read_reg(mod, vc_bypass_val_reg);
+ /*
+ * Loop till the bypass command is acknowledged from the SMPS.
+ * NOTE: This is legacy code. The loop count and retry count needs
+ * to be revisited.
+ */
+ while (!(vc_bypass_value & vc_valid)) {
+ loop_cnt++;
+
+ if (retries_cnt > 10) {
+ pr_warning("%s: Retry count exceeded\n", __func__);
+ return -ETIMEDOUT;
+ }
+
+ if (loop_cnt > 50) {
+ retries_cnt++;
+ loop_cnt = 0;
+ udelay(10);
+ }
+ vc_bypass_value = vdd->read_reg(mod, vc_bypass_val_reg);
+ }
+
+ _post_volt_scale(vdd, target_volt, target_vsel, current_vsel);
+ return 0;
+}
+
+/* VP force update method of voltage scaling */
+static int vp_forceupdate_scale_voltage(struct omap_vdd_info *vdd,
+ unsigned long target_volt)
+{
+ u32 vpconfig;
+ u16 mod, ocp_mod;
+ u8 target_vsel, current_vsel, prm_irqst_reg;
+ int ret, timeout = 0;
+
+ ret = _pre_volt_scale(vdd, target_volt, &target_vsel, ¤t_vsel);
+ if (ret)
+ return ret;
+
+ mod = vdd->vp_reg.prm_mod;
+ ocp_mod = vdd->ocp_mod;
+ prm_irqst_reg = vdd->prm_irqst_reg;
+
+ /*
+ * Clear all pending TransactionDone interrupt/status. Typical latency
+ * is <3us
+ */
+ while (timeout++ < VP_TRANXDONE_TIMEOUT) {
+ vdd->write_reg(vdd->vp_reg.tranxdone_status,
+ ocp_mod, prm_irqst_reg);
+ if (!(vdd->read_reg(ocp_mod, prm_irqst_reg) &
+ vdd->vp_reg.tranxdone_status))
+ break;
+ udelay(1);
+ }
+ if (timeout >= VP_TRANXDONE_TIMEOUT) {
+ pr_warning("%s: vdd_%s TRANXDONE timeout exceeded."
+ "Voltage change aborted", __func__, vdd->voltdm.name);
+ return -ETIMEDOUT;
+ }
+
+ /* Configure for VP-Force Update */
+ vpconfig = vdd->read_reg(mod, vdd->vp_offs.vpconfig);
+ vpconfig &= ~(vdd->vp_reg.vpconfig_initvdd |
+ vdd->vp_reg.vpconfig_forceupdate |
+ vdd->vp_reg.vpconfig_initvoltage_mask);
+ vpconfig |= ((target_vsel <<
+ vdd->vp_reg.vpconfig_initvoltage_shift));
+ vdd->write_reg(vpconfig, mod, vdd->vp_offs.vpconfig);
+
+ /* Trigger initVDD value copy to voltage processor */
+ vpconfig |= vdd->vp_reg.vpconfig_initvdd;
+ vdd->write_reg(vpconfig, mod, vdd->vp_offs.vpconfig);
+
+ /* Force update of voltage */
+ vpconfig |= vdd->vp_reg.vpconfig_forceupdate;
+ vdd->write_reg(vpconfig, mod, vdd->vp_offs.vpconfig);
+
+ /*
+ * Wait for TransactionDone. Typical latency is <200us.
+ * Depends on SMPSWAITTIMEMIN/MAX and voltage change
+ */
+ timeout = 0;
+ omap_test_timeout((vdd->read_reg(ocp_mod, prm_irqst_reg) &
+ vdd->vp_reg.tranxdone_status),
+ VP_TRANXDONE_TIMEOUT, timeout);
+ if (timeout >= VP_TRANXDONE_TIMEOUT)
+ pr_err("%s: vdd_%s TRANXDONE timeout exceeded."
+ "TRANXDONE never got set after the voltage update\n",
+ __func__, vdd->voltdm.name);
+
+ _post_volt_scale(vdd, target_volt, target_vsel, current_vsel);
+
+ /*
+ * Disable TransactionDone interrupt , clear all status, clear
+ * control registers
+ */
+ timeout = 0;
+ while (timeout++ < VP_TRANXDONE_TIMEOUT) {
+ vdd->write_reg(vdd->vp_reg.tranxdone_status,
+ ocp_mod, prm_irqst_reg);
+ if (!(vdd->read_reg(ocp_mod, prm_irqst_reg) &
+ vdd->vp_reg.tranxdone_status))
+ break;
+ udelay(1);
+ }
+
+ if (timeout >= VP_TRANXDONE_TIMEOUT)
+ pr_warning("%s: vdd_%s TRANXDONE timeout exceeded while trying"
+ "to clear the TRANXDONE status\n",
+ __func__, vdd->voltdm.name);
+
+ vpconfig = vdd->read_reg(mod, vdd->vp_offs.vpconfig);
+ /* Clear initVDD copy trigger bit */
+ vpconfig &= ~vdd->vp_reg.vpconfig_initvdd;;
+ vdd->write_reg(vpconfig, mod, vdd->vp_offs.vpconfig);
+ /* Clear force bit */
+ vpconfig &= ~vdd->vp_reg.vpconfig_forceupdate;
+ vdd->write_reg(vpconfig, mod, vdd->vp_offs.vpconfig);
+
+ return 0;
+}
+
+/* OMAP3 specific voltage init functions */
+
+/*
+ * Intializes the voltage controller registers with the PMIC and board
+ * specific parameters and voltage setup times for OMAP3.
+ */
+static void __init omap3_vc_init(struct omap_vdd_info *vdd)
+{
+ u32 vc_val;
+ u16 mod;
+ u8 on_vsel, onlp_vsel, ret_vsel, off_vsel;
+ static bool is_initialized;
+
+ if (!vdd->pmic_info || !vdd->pmic_info->uv_to_vsel) {
+ pr_err("%s: PMIC info requried to configure vc for"
+ "vdd_%s not populated.Hence cannot initialize vc\n",
+ __func__, vdd->voltdm.name);
+ return;
+ }
+
+ if (!vdd->read_reg || !vdd->write_reg) {
+ pr_err("%s: No read/write API for accessing vdd_%s regs\n",
+ __func__, vdd->voltdm.name);
+ return;
+ }
+
+ mod = vdd->vc_reg.prm_mod;
+
+ /* Set up the SMPS_SA(i2c slave address in VC */
+ vc_val = vdd->read_reg(mod, vdd->vc_reg.smps_sa_reg);
+ vc_val &= ~vdd->vc_reg.smps_sa_mask;
+ vc_val |= vdd->pmic_info->i2c_slave_addr << vdd->vc_reg.smps_sa_shift;
+ vdd->write_reg(vc_val, mod, vdd->vc_reg.smps_sa_reg);
+
+ /* Setup the VOLRA(pmic reg addr) in VC */
+ vc_val = vdd->read_reg(mod, vdd->vc_reg.smps_volra_reg);
+ vc_val &= ~vdd->vc_reg.smps_volra_mask;
+ vc_val |= vdd->pmic_info->pmic_reg << vdd->vc_reg.smps_volra_shift;
+ vdd->write_reg(vc_val, mod, vdd->vc_reg.smps_volra_reg);
+
+ /*Configure the setup times */
+ vc_val = vdd->read_reg(mod, vdd->vc_reg.voltsetup_reg);
+ vc_val &= ~vdd->vc_reg.voltsetup_mask;
+ vc_val |= vdd->pmic_info->volt_setup_time <<
+ vdd->vc_reg.voltsetup_shift;
+ vdd->write_reg(vc_val, mod, vdd->vc_reg.voltsetup_reg);
+
+ /* Set up the on, inactive, retention and off voltage */
+ on_vsel = vdd->pmic_info->uv_to_vsel(vdd->pmic_info->on_volt);
+ onlp_vsel = vdd->pmic_info->uv_to_vsel(vdd->pmic_info->onlp_volt);
+ ret_vsel = vdd->pmic_info->uv_to_vsel(vdd->pmic_info->ret_volt);
+ off_vsel = vdd->pmic_info->uv_to_vsel(vdd->pmic_info->off_volt);
+ vc_val = ((on_vsel << vdd->vc_reg.cmd_on_shift) |
+ (onlp_vsel << vdd->vc_reg.cmd_onlp_shift) |
+ (ret_vsel << vdd->vc_reg.cmd_ret_shift) |
+ (off_vsel << vdd->vc_reg.cmd_off_shift));
+ vdd->write_reg(vc_val, mod, vdd->vc_reg.cmdval_reg);
+
+ if (is_initialized)
+ return;
+
+ /* Generic VC parameters init */
+ vdd->write_reg(OMAP3430_CMD1_MASK | OMAP3430_RAV1_MASK, mod,
+ OMAP3_PRM_VC_CH_CONF_OFFSET);
+ vdd->write_reg(OMAP3430_MCODE_SHIFT | OMAP3430_HSEN_MASK, mod,
+ OMAP3_PRM_VC_I2C_CFG_OFFSET);
+ vdd->write_reg(OMAP3_CLKSETUP, mod, OMAP3_PRM_CLKSETUP_OFFSET);
+ vdd->write_reg(OMAP3_VOLTOFFSET, mod, OMAP3_PRM_VOLTOFFSET_OFFSET);
+ vdd->write_reg(OMAP3_VOLTSETUP2, mod, OMAP3_PRM_VOLTSETUP2_OFFSET);
+ is_initialized = true;
+}
+
+/* Sets up all the VDD related info for OMAP3 */
+static int __init omap3_vdd_data_configure(struct omap_vdd_info *vdd)
+{
+ struct clk *sys_ck;
+ u32 sys_clk_speed, timeout_val, waittime;
+
+ if (!vdd->pmic_info) {
+ pr_err("%s: PMIC info requried to configure vdd_%s not"
+ "populated.Hence cannot initialize vdd_%s\n",
+ __func__, vdd->voltdm.name, vdd->voltdm.name);
+ return -EINVAL;
+ }
+
+ if (!strcmp(vdd->voltdm.name, "mpu")) {
+ if (cpu_is_omap3630())
+ vdd->volt_data = omap36xx_vddmpu_volt_data;
+ else
+ vdd->volt_data = omap34xx_vddmpu_volt_data;
+
+ vdd->vp_reg.tranxdone_status = OMAP3430_VP1_TRANXDONE_ST_MASK;
+ vdd->vc_reg.cmdval_reg = OMAP3_PRM_VC_CMD_VAL_0_OFFSET;
+ vdd->vc_reg.smps_sa_shift = OMAP3430_PRM_VC_SMPS_SA_SA0_SHIFT;
+ vdd->vc_reg.smps_sa_mask = OMAP3430_PRM_VC_SMPS_SA_SA0_MASK;
+ vdd->vc_reg.smps_volra_shift = OMAP3430_VOLRA0_SHIFT;
+ vdd->vc_reg.smps_volra_mask = OMAP3430_VOLRA0_MASK;
+ vdd->vc_reg.voltsetup_shift = OMAP3430_SETUP_TIME1_SHIFT;
+ vdd->vc_reg.voltsetup_mask = OMAP3430_SETUP_TIME1_MASK;
+ } else if (!strcmp(vdd->voltdm.name, "core")) {
+ if (cpu_is_omap3630())
+ vdd->volt_data = omap36xx_vddcore_volt_data;
+ else
+ vdd->volt_data = omap34xx_vddcore_volt_data;
+
+ vdd->vp_reg.tranxdone_status = OMAP3430_VP2_TRANXDONE_ST_MASK;
+ vdd->vc_reg.cmdval_reg = OMAP3_PRM_VC_CMD_VAL_1_OFFSET;
+ vdd->vc_reg.smps_sa_shift = OMAP3430_PRM_VC_SMPS_SA_SA1_SHIFT;
+ vdd->vc_reg.smps_sa_mask = OMAP3430_PRM_VC_SMPS_SA_SA1_MASK;
+ vdd->vc_reg.smps_volra_shift = OMAP3430_VOLRA1_SHIFT;
+ vdd->vc_reg.smps_volra_mask = OMAP3430_VOLRA1_MASK;
+ vdd->vc_reg.voltsetup_shift = OMAP3430_SETUP_TIME2_SHIFT;
+ vdd->vc_reg.voltsetup_mask = OMAP3430_SETUP_TIME2_MASK;
+ } else {
+ pr_warning("%s: vdd_%s does not exisit in OMAP3\n",
+ __func__, vdd->voltdm.name);
+ return -EINVAL;
+ }
+
+ /*
+ * Sys clk rate is require to calculate vp timeout value and
+ * smpswaittimemin and smpswaittimemax.
+ */
+ sys_ck = clk_get(NULL, "sys_ck");
+ if (IS_ERR(sys_ck)) {
+ pr_warning("%s: Could not get the sys clk to calculate"
+ "various vdd_%s params\n", __func__, vdd->voltdm.name);
+ return -EINVAL;
+ }
+ sys_clk_speed = clk_get_rate(sys_ck);
+ clk_put(sys_ck);
+ /* Divide to avoid overflow */
+ sys_clk_speed /= 1000;
+
+ /* Generic voltage parameters */
+ vdd->curr_volt = 1200000;
+ vdd->ocp_mod = OCP_MOD;
+ vdd->prm_irqst_reg = OMAP3_PRM_IRQSTATUS_MPU_OFFSET;
+ vdd->read_reg = omap3_voltage_read_reg;
+ vdd->write_reg = omap3_voltage_write_reg;
+ vdd->volt_scale = vp_forceupdate_scale_voltage;
+ vdd->vp_enabled = false;
+
+ /* VC parameters */
+ vdd->vc_reg.prm_mod = OMAP3430_GR_MOD;
+ vdd->vc_reg.smps_sa_reg = OMAP3_PRM_VC_SMPS_SA_OFFSET;
+ vdd->vc_reg.smps_volra_reg = OMAP3_PRM_VC_SMPS_VOL_RA_OFFSET;
+ vdd->vc_reg.bypass_val_reg = OMAP3_PRM_VC_BYPASS_VAL_OFFSET;
+ vdd->vc_reg.voltsetup_reg = OMAP3_PRM_VOLTSETUP1_OFFSET;
+ vdd->vc_reg.data_shift = OMAP3430_DATA_SHIFT;
+ vdd->vc_reg.slaveaddr_shift = OMAP3430_SLAVEADDR_SHIFT;
+ vdd->vc_reg.regaddr_shift = OMAP3430_REGADDR_SHIFT;
+ vdd->vc_reg.valid = OMAP3430_VALID_MASK;
+ vdd->vc_reg.cmd_on_shift = OMAP3430_VC_CMD_ON_SHIFT;
+ vdd->vc_reg.cmd_on_mask = OMAP3430_VC_CMD_ON_MASK;
+ vdd->vc_reg.cmd_onlp_shift = OMAP3430_VC_CMD_ONLP_SHIFT;
+ vdd->vc_reg.cmd_ret_shift = OMAP3430_VC_CMD_RET_SHIFT;
+ vdd->vc_reg.cmd_off_shift = OMAP3430_VC_CMD_OFF_SHIFT;
+
+ vdd->vp_reg.prm_mod = OMAP3430_GR_MOD;
+
+ /* VPCONFIG bit fields */
+ vdd->vp_reg.vpconfig_erroroffset = (vdd->pmic_info->vp_erroroffset <<
+ OMAP3430_ERROROFFSET_SHIFT);
+ vdd->vp_reg.vpconfig_errorgain_mask = OMAP3430_ERRORGAIN_MASK;
+ vdd->vp_reg.vpconfig_errorgain_shift = OMAP3430_ERRORGAIN_SHIFT;
+ vdd->vp_reg.vpconfig_initvoltage_shift = OMAP3430_INITVOLTAGE_SHIFT;
+ vdd->vp_reg.vpconfig_initvoltage_mask = OMAP3430_INITVOLTAGE_MASK;
+ vdd->vp_reg.vpconfig_timeouten = OMAP3430_TIMEOUTEN_MASK;
+ vdd->vp_reg.vpconfig_initvdd = OMAP3430_INITVDD_MASK;
+ vdd->vp_reg.vpconfig_forceupdate = OMAP3430_FORCEUPDATE_MASK;
+ vdd->vp_reg.vpconfig_vpenable = OMAP3430_VPENABLE_MASK;
+
+ /* VSTEPMIN VSTEPMAX bit fields */
+ waittime = ((vdd->pmic_info->step_size / vdd->pmic_info->slew_rate) *
+ sys_clk_speed) / 1000;
+ vdd->vp_reg.vstepmin_smpswaittimemin = waittime;
+ vdd->vp_reg.vstepmax_smpswaittimemax = waittime;
+ vdd->vp_reg.vstepmin_stepmin = vdd->pmic_info->vp_vstepmin;
+ vdd->vp_reg.vstepmax_stepmax = vdd->pmic_info->vp_vstepmax;
+ vdd->vp_reg.vstepmin_smpswaittimemin_shift =
+ OMAP3430_SMPSWAITTIMEMIN_SHIFT;
+ vdd->vp_reg.vstepmax_smpswaittimemax_shift =
+ OMAP3430_SMPSWAITTIMEMAX_SHIFT;
+ vdd->vp_reg.vstepmin_stepmin_shift = OMAP3430_VSTEPMIN_SHIFT;
+ vdd->vp_reg.vstepmax_stepmax_shift = OMAP3430_VSTEPMAX_SHIFT;
+
+ /* VLIMITTO bit fields */
+ timeout_val = (sys_clk_speed * vdd->pmic_info->vp_timeout_us) / 1000;
+ vdd->vp_reg.vlimitto_timeout = timeout_val;
+ vdd->vp_reg.vlimitto_vddmin = vdd->pmic_info->vp_vddmin;
+ vdd->vp_reg.vlimitto_vddmax = vdd->pmic_info->vp_vddmax;
+ vdd->vp_reg.vlimitto_vddmin_shift = OMAP3430_VDDMIN_SHIFT;
+ vdd->vp_reg.vlimitto_vddmax_shift = OMAP3430_VDDMAX_SHIFT;
+ vdd->vp_reg.vlimitto_timeout_shift = OMAP3430_TIMEOUT_SHIFT;
+
+ return 0;
+}
+
+/* Public functions */
+/**
+ * omap_voltage_get_nom_volt() - Gets the current non-auto-compensated voltage
+ * @voltdm: pointer to the VDD for which current voltage info is needed
+ *
+ * API to get the current non-auto-compensated voltage for a VDD.
+ * Returns 0 in case of error else returns the current voltage for the VDD.
+ */
+unsigned long omap_voltage_get_nom_volt(struct voltagedomain *voltdm)
+{
+ struct omap_vdd_info *vdd;
+
+ if (!voltdm || IS_ERR(voltdm)) {
+ pr_warning("%s: VDD specified does not exist!\n", __func__);
+ return 0;
+ }
+
+ vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
+
+ return vdd->curr_volt;
+}
+
+/**
+ * omap_vp_get_curr_volt() - API to get the current vp voltage.
+ * @voltdm: pointer to the VDD.
+ *
+ * This API returns the current voltage for the specified voltage processor
+ */
+unsigned long omap_vp_get_curr_volt(struct voltagedomain *voltdm)
+{
+ struct omap_vdd_info *vdd;
+ u8 curr_vsel;
+
+ if (!voltdm || IS_ERR(voltdm)) {
+ pr_warning("%s: VDD specified does not exist!\n", __func__);
+ return 0;
+ }
+
+ vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
+ if (!vdd->read_reg) {
+ pr_err("%s: No read API for reading vdd_%s regs\n",
+ __func__, voltdm->name);
+ return 0;
+ }
+
+ curr_vsel = vdd->read_reg(vdd->vp_reg.prm_mod,
+ vdd->vp_offs.voltage);
+
+ if (!vdd->pmic_info || !vdd->pmic_info->vsel_to_uv) {
+ pr_warning("%s: PMIC function to convert vsel to voltage"
+ "in uV not registerd\n", __func__);
+ return 0;
+ }
+
+ return vdd->pmic_info->vsel_to_uv(curr_vsel);
+}
+
+/**
+ * omap_vp_enable() - API to enable a particular VP
+ * @voltdm: pointer to the VDD whose VP is to be enabled.
+ *
+ * This API enables a particular voltage processor. Needed by the smartreflex
+ * class drivers.
+ */
+void omap_vp_enable(struct voltagedomain *voltdm)
+{
+ struct omap_vdd_info *vdd;
+ u32 vpconfig;
+ u16 mod;
+
+ if (!voltdm || IS_ERR(voltdm)) {
+ pr_warning("%s: VDD specified does not exist!\n", __func__);
+ return;
+ }
+
+ vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
+ if (!vdd->read_reg || !vdd->write_reg) {
+ pr_err("%s: No read/write API for accessing vdd_%s regs\n",
+ __func__, voltdm->name);
+ return;
+ }
+
+ mod = vdd->vp_reg.prm_mod;
+
+ /* If VP is already enabled, do nothing. Return */
+ if (vdd->vp_enabled)
+ return;
+
+ vp_latch_vsel(vdd);
+
+ /* Enable VP */
+ vpconfig = vdd->read_reg(mod, vdd->vp_offs.vpconfig);
+ vpconfig |= vdd->vp_reg.vpconfig_vpenable;
+ vdd->write_reg(vpconfig, mod, vdd->vp_offs.vpconfig);
+ vdd->vp_enabled = true;
+}
+
+/**
+ * omap_vp_disable() - API to disable a particular VP
+ * @voltdm: pointer to the VDD whose VP is to be disabled.
+ *
+ * This API disables a particular voltage processor. Needed by the smartreflex
+ * class drivers.
+ */
+void omap_vp_disable(struct voltagedomain *voltdm)
+{
+ struct omap_vdd_info *vdd;
+ u32 vpconfig;
+ u16 mod;
+ int timeout;
+
+ if (!voltdm || IS_ERR(voltdm)) {
+ pr_warning("%s: VDD specified does not exist!\n", __func__);
+ return;
+ }
+
+ vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
+ if (!vdd->read_reg || !vdd->write_reg) {
+ pr_err("%s: No read/write API for accessing vdd_%s regs\n",
+ __func__, voltdm->name);
+ return;
+ }
+
+ mod = vdd->vp_reg.prm_mod;
+
+ /* If VP is already disabled, do nothing. Return */
+ if (!vdd->vp_enabled) {
+ pr_warning("%s: Trying to disable VP for vdd_%s when"
+ "it is already disabled\n", __func__, voltdm->name);
+ return;
+ }
+
+ /* Disable VP */
+ vpconfig = vdd->read_reg(mod, vdd->vp_offs.vpconfig);
+ vpconfig &= ~vdd->vp_reg.vpconfig_vpenable;
+ vdd->write_reg(vpconfig, mod, vdd->vp_offs.vpconfig);
+
+ /*
+ * Wait for VP idle Typical latency is <2us. Maximum latency is ~100us
+ */
+ omap_test_timeout((vdd->read_reg(mod, vdd->vp_offs.vstatus)),
+ VP_IDLE_TIMEOUT, timeout);
+
+ if (timeout >= VP_IDLE_TIMEOUT)
+ pr_warning("%s: vdd_%s idle timedout\n",
+ __func__, voltdm->name);
+
+ vdd->vp_enabled = false;
+
+ return;
+}
+
+/**
+ * omap_voltage_scale_vdd() - API to scale voltage of a particular
+ * voltage domain.
+ * @voltdm: pointer to the VDD which is to be scaled.
+ * @target_volt: The target voltage of the voltage domain
+ *
+ * This API should be called by the kernel to do the voltage scaling
+ * for a particular voltage domain during dvfs or any other situation.
+ */
+int omap_voltage_scale_vdd(struct voltagedomain *voltdm,
+ unsigned long target_volt)
+{
+ struct omap_vdd_info *vdd;
+
+ if (!voltdm || IS_ERR(voltdm)) {
+ pr_warning("%s: VDD specified does not exist!\n", __func__);
+ return -EINVAL;
+ }
+
+ vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
+
+ if (!vdd->volt_scale) {
+ pr_err("%s: No voltage scale API registered for vdd_%s\n",
+ __func__, voltdm->name);
+ return -ENODATA;
+ }
+
+ return vdd->volt_scale(vdd, target_volt);
+}
+
+/**
+ * omap_voltage_reset() - Resets the voltage of a particular voltage domain
+ * to that of the current OPP.
+ * @voltdm: pointer to the VDD whose voltage is to be reset.
+ *
+ * This API finds out the correct voltage the voltage domain is supposed
+ * to be at and resets the voltage to that level. Should be used expecially
+ * while disabling any voltage compensation modules.
+ */
+void omap_voltage_reset(struct voltagedomain *voltdm)
+{
+ unsigned long target_uvdc;
+
+ if (!voltdm || IS_ERR(voltdm)) {
+ pr_warning("%s: VDD specified does not exist!\n", __func__);
+ return;
+ }
+
+ target_uvdc = omap_voltage_get_nom_volt(voltdm);
+ if (!target_uvdc) {
+ pr_err("%s: unable to find current voltage for vdd_%s\n",
+ __func__, voltdm->name);
+ return;
+ }
+
+ omap_voltage_scale_vdd(voltdm, target_uvdc);
+}
+
+/**
+ * omap_voltage_get_volttable() - API to get the voltage table associated with a
+ * particular voltage domain.
+ * @voltdm: pointer to the VDD for which the voltage table is required
+ * @volt_data: the voltage table for the particular vdd which is to be
+ * populated by this API
+ *
+ * This API populates the voltage table associated with a VDD into the
+ * passed parameter pointer. Returns the count of distinct voltages
+ * supported by this vdd.
+ *
+ */
+void omap_voltage_get_volttable(struct voltagedomain *voltdm,
+ struct omap_volt_data **volt_data)
+{
+ struct omap_vdd_info *vdd;
+
+ if (!voltdm || IS_ERR(voltdm)) {
+ pr_warning("%s: VDD specified does not exist!\n", __func__);
+ return;
+ }
+
+ vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
+
+ *volt_data = vdd->volt_data;
+}
+
+/**
+ * omap_voltage_get_voltdata() - API to get the voltage table entry for a
+ * particular voltage
+ * @voltdm: pointer to the VDD whose voltage table has to be searched
+ * @volt: the voltage to be searched in the voltage table
+ *
+ * This API searches through the voltage table for the required voltage
+ * domain and tries to find a matching entry for the passed voltage volt.
+ * If a matching entry is found volt_data is populated with that entry.
+ * This API searches only through the non-compensated voltages int the
+ * voltage table.
+ * Returns pointer to the voltage table entry corresponding to volt on
+ * sucess. Returns -ENODATA if no voltage table exisits for the passed voltage
+ * domain or if there is no matching entry.
+ */
+struct omap_volt_data *omap_voltage_get_voltdata(struct voltagedomain *voltdm,
+ unsigned long volt)
+{
+ struct omap_vdd_info *vdd;
+ int i;
+
+ if (!voltdm || IS_ERR(voltdm)) {
+ pr_warning("%s: VDD specified does not exist!\n", __func__);
+ return ERR_PTR(-EINVAL);
+ }
+
+ vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
+
+ if (!vdd->volt_data) {
+ pr_warning("%s: voltage table does not exist for vdd_%s\n",
+ __func__, voltdm->name);
+ return ERR_PTR(-ENODATA);
+ }
+
+ for (i = 0; vdd->volt_data[i].volt_nominal != 0; i++) {
+ if (vdd->volt_data[i].volt_nominal == volt)
+ return &vdd->volt_data[i];
+ }
+
+ pr_notice("%s: Unable to match the current voltage with the voltage"
+ "table for vdd_%s\n", __func__, voltdm->name);
+
+ return ERR_PTR(-ENODATA);
+}
+
+/**
+ * omap_voltage_register_pmic() - API to register PMIC specific data
+ * @voltdm: pointer to the VDD for which the PMIC specific data is
+ * to be registered
+ * @pmic_info: the structure containing pmic info
+ *
+ * This API is to be called by the SOC/PMIC file to specify the
+ * pmic specific info as present in omap_volt_pmic_info structure.
+ */
+int omap_voltage_register_pmic(struct voltagedomain *voltdm,
+ struct omap_volt_pmic_info *pmic_info)
+{
+ struct omap_vdd_info *vdd;
+
+ if (!voltdm || IS_ERR(voltdm)) {
+ pr_warning("%s: VDD specified does not exist!\n", __func__);
+ return -EINVAL;
+ }
+
+ vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
+
+ vdd->pmic_info = pmic_info;
+
+ return 0;
+}
+
+/**
+ * omap_voltage_get_dbgdir() - API to get pointer to the debugfs directory
+ * corresponding to a voltage domain.
+ *
+ * @voltdm: pointer to the VDD whose debug directory is required.
+ *
+ * This API returns pointer to the debugfs directory corresponding
+ * to the voltage domain. Should be used by drivers requiring to
+ * add any debug entry for a particular voltage domain. Returns NULL
+ * in case of error.
+ */
+struct dentry *omap_voltage_get_dbgdir(struct voltagedomain *voltdm)
+{
+ struct omap_vdd_info *vdd;
+
+ if (!voltdm || IS_ERR(voltdm)) {
+ pr_warning("%s: VDD specified does not exist!\n", __func__);
+ return NULL;
+ }
+
+ vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
+
+ return vdd->debug_dir;
+}
+
+/**
+ * omap_change_voltscale_method() - API to change the voltage scaling method.
+ * @voltdm: pointer to the VDD whose voltage scaling method
+ * has to be changed.
+ * @voltscale_method: the method to be used for voltage scaling.
+ *
+ * This API can be used by the board files to change the method of voltage
+ * scaling between vpforceupdate and vcbypass. The parameter values are
+ * defined in voltage.h
+ */
+void omap_change_voltscale_method(struct voltagedomain *voltdm,
+ int voltscale_method)
+{
+ struct omap_vdd_info *vdd;
+
+ if (!voltdm || IS_ERR(voltdm)) {
+ pr_warning("%s: VDD specified does not exist!\n", __func__);
+ return;
+ }
+
+ vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
+
+ switch (voltscale_method) {
+ case VOLTSCALE_VPFORCEUPDATE:
+ vdd->volt_scale = vp_forceupdate_scale_voltage;
+ return;
+ case VOLTSCALE_VCBYPASS:
+ vdd->volt_scale = vc_bypass_scale_voltage;
+ return;
+ default:
+ pr_warning("%s: Trying to change the method of voltage scaling"
+ "to an unsupported one!\n", __func__);
+ }
+}
+
+/**
+ * omap_voltage_domain_lookup() - API to get the voltage domain pointer
+ * @name: Name of the voltage domain
+ *
+ * This API looks up in the global vdd_info struct for the
+ * existence of voltage domain <name>. If it exists, the API returns
+ * a pointer to the voltage domain structure corresponding to the
+ * VDD<name>. Else retuns error pointer.
+ */
+struct voltagedomain *omap_voltage_domain_lookup(char *name)
+{
+ int i;
+
+ if (!vdd_info) {
+ pr_err("%s: Voltage driver init not yet happened.Faulting!\n",
+ __func__);
+ return ERR_PTR(-EINVAL);
+ }
+
+ if (!name) {
+ pr_err("%s: No name to get the votage domain!\n", __func__);
+ return ERR_PTR(-EINVAL);
+ }
+
+ for (i = 0; i < nr_scalable_vdd; i++) {
+ if (!(strcmp(name, vdd_info[i].voltdm.name)))
+ return &vdd_info[i].voltdm;
+ }
+
+ return ERR_PTR(-EINVAL);
+}
+
+/**
+ * omap_voltage_late_init() - Init the various voltage parameters
+ *
+ * This API is to be called in the later stages of the
+ * system boot to init the voltage controller and
+ * voltage processors.
+ */
+int __init omap_voltage_late_init(void)
+{
+ int i;
+
+ if (!vdd_info) {
+ pr_err("%s: Voltage driver support not added\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ voltage_dir = debugfs_create_dir("voltage", NULL);
+ if (IS_ERR(voltage_dir))
+ pr_err("%s: Unable to create voltage debugfs main dir\n",
+ __func__);
+ for (i = 0; i < nr_scalable_vdd; i++) {
+ if (vdd_data_configure(&vdd_info[i]))
+ continue;
+ vc_init(&vdd_info[i]);
+ vp_init(&vdd_info[i]);
+ vdd_debugfs_init(&vdd_info[i]);
+ }
+
+ return 0;
+}
+
+/**
+ * omap_voltage_early_init()- Volatage driver early init
+ */
+static int __init omap_voltage_early_init(void)
+{
+ if (cpu_is_omap34xx()) {
+ vdd_info = omap3_vdd_info;
+ nr_scalable_vdd = OMAP3_NR_SCALABLE_VDD;
+ vc_init = omap3_vc_init;
+ vdd_data_configure = omap3_vdd_data_configure;
+ } else {
+ pr_warning("%s: voltage driver support not added\n", __func__);
+ }
+
+ return 0;
+}
+core_initcall(omap_voltage_early_init);
projects / GitHub / exynos8895 / android_kernel_samsung_universal8895.git / commitdiff