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/*
* 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);
}
/* Voltage debugfs support */
static int vp_volt_debug_get(void *data, u64 *val)
{
struct omap_vdd_info *vdd = (struct omap_vdd_info *) data;
u8 vsel;
if (!vdd) {
pr_warning("Wrong paramater passed\n");
return -EINVAL;
}
vsel = vdd->read_reg(vdd->vp_reg.prm_mod, vdd->vp_offs.voltage);
pr_notice("curr_vsel = %x\n", vsel);
if (!vdd->pmic_info->vsel_to_uv) {
pr_warning("PMIC function to convert vsel to voltage"
"in uV not registerd\n");
return -EINVAL;
}
*val = vdd->pmic_info->vsel_to_uv(vsel);
return 0;
}
static int nom_volt_debug_get(void *data, u64 *val)
{
struct omap_vdd_info *vdd = (struct omap_vdd_info *) data;
if (!vdd) {
pr_warning("Wrong paramater passed\n");
return -EINVAL;
}
*val = omap_voltage_get_nom_volt(&vdd->voltdm);
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(vp_volt_debug_fops, vp_volt_debug_get, NULL, "%llu\n");
DEFINE_SIMPLE_ATTRIBUTE(nom_volt_debug_fops, nom_volt_debug_get, NULL,
"%llu\n");
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;
return;
}
(void) debugfs_create_x16("vp_errorgain", S_IRUGO, vdd->debug_dir,
&(vdd->vp_reg.vpconfig_errorgain));
(void) debugfs_create_x16("vp_smpswaittimemin", S_IRUGO,
vdd->debug_dir,
&(vdd->vp_reg.vstepmin_smpswaittimemin));
(void) debugfs_create_x8("vp_stepmin", S_IRUGO, vdd->debug_dir,
&(vdd->vp_reg.vstepmin_stepmin));
(void) debugfs_create_x16("vp_smpswaittimemax", S_IRUGO,
vdd->debug_dir,
&(vdd->vp_reg.vstepmax_smpswaittimemax));
(void) debugfs_create_x8("vp_stepmax", S_IRUGO, vdd->debug_dir,
&(vdd->vp_reg.vstepmax_stepmax));
(void) debugfs_create_x8("vp_vddmax", S_IRUGO, vdd->debug_dir,
&(vdd->vp_reg.vlimitto_vddmax));
(void) debugfs_create_x8("vp_vddmin", S_IRUGO, vdd->debug_dir,
&(vdd->vp_reg.vlimitto_vddmin));
(void) debugfs_create_x16("vp_timeout", S_IRUGO, vdd->debug_dir,
&(vdd->vp_reg.vlimitto_timeout));
(void) debugfs_create_file("curr_vp_volt", S_IRUGO, vdd->debug_dir,
(void *) vdd, &vp_volt_debug_fops);
(void) debugfs_create_file("curr_nominal_volt", S_IRUGO,
vdd->debug_dir, (void *) vdd,
&nom_volt_debug_fops);
}
/* 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, &current_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, &current_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);