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OMAP2+: voltage: split out voltage processor (VP) code into new layer

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This patch is primarily a move of VP specific code from voltage.c into
its own code in vp.c and adds prototypes to vp.h

No functional changes, except debugfs...

VP debugfs moved to 'vp' subdir of <debugfs>/voltage/ and 'vp_'
prefixes removed from all debugfs filenames.

Signed-off-by: Kevin Hilman <khilman@ti.com>
This commit is contained in:
Kevin Hilman 2011-03-21 14:29:13 -07:00
parent 4d47506a85
commit 01f48d308d
5 changed files with 387 additions and 349 deletions
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2
arch/arm/mach-omap2/Makefile
View file

@ -90,7 +90,7 @@ obj-$(CONFIG_ARCH_OMAP4) += prcm.o cm2xxx_3xxx.o cminst44xx.o \
# OMAP voltage domains
ifeq ($(CONFIG_PM),y)
voltagedomain-common := voltage.o vc.o
voltagedomain-common := voltage.o vc.o vp.o
obj-$(CONFIG_ARCH_OMAP2) += $(voltagedomain-common) \
voltagedomains2xxx_data.o
obj-$(CONFIG_ARCH_OMAP3) += $(voltagedomain-common) \

348
arch/arm/mach-omap2/voltage.c
View file

@ -46,10 +46,6 @@ static LIST_HEAD(voltdm_list);
#define VOLTAGE_DIR_SIZE 16
static struct dentry *voltage_dir;
/* Init function pointers */
static int vp_forceupdate_scale_voltage(struct voltagedomain *voltdm,
unsigned long target_volt);
static u32 omap3_voltage_read_reg(u16 mod, u8 offset)
{
return omap2_prm_read_mod_reg(mod, offset);
@ -105,7 +101,7 @@ static int __init _config_common_vdd_data(struct voltagedomain *voltdm)
sys_clk_speed /= 1000;
/* Generic voltage parameters */
vdd->volt_scale = vp_forceupdate_scale_voltage;
vdd->volt_scale = omap_vp_forceupdate_scale;
vdd->vp_enabled = false;
vdd->vp_rt_data.vpconfig_erroroffset =
@ -127,30 +123,6 @@ static int __init _config_common_vdd_data(struct voltagedomain *voltdm)
return 0;
}
/* Voltage debugfs support */
static int vp_volt_debug_get(void *data, u64 *val)
{
struct voltagedomain *voltdm = (struct voltagedomain *)data;
struct omap_vdd_info *vdd = voltdm->vdd;
u8 vsel;
if (!vdd) {
pr_warning("Wrong paramater passed\n");
return -EINVAL;
}
vsel = vdd->read_reg(vdd->vp_data->vp_common->prm_mod, vdd->vp_data->voltage);
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 voltagedomain *voltdm = (struct voltagedomain *)data;
@ -165,85 +137,8 @@ static int nom_volt_debug_get(void *data, u64 *val)
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 voltagedomain *voltdm)
{
u32 vpconfig;
unsigned long uvdc;
char vsel;
struct omap_vdd_info *vdd = voltdm->vdd;
uvdc = omap_voltage_get_nom_volt(voltdm);
if (!uvdc) {
pr_warning("%s: unable to find current voltage for vdd_%s\n",
__func__, 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;
}
vsel = vdd->pmic_info->uv_to_vsel(uvdc);
vpconfig = vdd->read_reg(vdd->vp_data->vp_common->prm_mod, vdd->vp_data->vpconfig);
vpconfig &= ~(vdd->vp_data->vp_common->vpconfig_initvoltage_mask |
vdd->vp_data->vp_common->vpconfig_initvdd);
vpconfig |= vsel << vdd->vp_data->vp_common->vpconfig_initvoltage_shift;
vdd->write_reg(vpconfig, vdd->vp_data->vp_common->prm_mod, vdd->vp_data->vpconfig);
/* Trigger initVDD value copy to voltage processor */
vdd->write_reg((vpconfig | vdd->vp_data->vp_common->vpconfig_initvdd),
vdd->vp_data->vp_common->prm_mod, vdd->vp_data->vpconfig);
/* Clear initVDD copy trigger bit */
vdd->write_reg(vpconfig, vdd->vp_data->vp_common->prm_mod, vdd->vp_data->vpconfig);
}
/* Generic voltage init functions */
static void __init vp_init(struct voltagedomain *voltdm)
{
struct omap_vdd_info *vdd = voltdm->vdd;
u32 vp_val;
if (!vdd->read_reg || !vdd->write_reg) {
pr_err("%s: No read/write API for accessing vdd_%s regs\n",
__func__, voltdm->name);
return;
}
vp_val = vdd->vp_rt_data.vpconfig_erroroffset |
(vdd->vp_rt_data.vpconfig_errorgain <<
vdd->vp_data->vp_common->vpconfig_errorgain_shift) |
vdd->vp_data->vp_common->vpconfig_timeouten;
vdd->write_reg(vp_val, vdd->vp_data->vp_common->prm_mod, vdd->vp_data->vpconfig);
vp_val = ((vdd->vp_rt_data.vstepmin_smpswaittimemin <<
vdd->vp_data->vp_common->vstepmin_smpswaittimemin_shift) |
(vdd->vp_rt_data.vstepmin_stepmin <<
vdd->vp_data->vp_common->vstepmin_stepmin_shift));
vdd->write_reg(vp_val, vdd->vp_data->vp_common->prm_mod, vdd->vp_data->vstepmin);
vp_val = ((vdd->vp_rt_data.vstepmax_smpswaittimemax <<
vdd->vp_data->vp_common->vstepmax_smpswaittimemax_shift) |
(vdd->vp_rt_data.vstepmax_stepmax <<
vdd->vp_data->vp_common->vstepmax_stepmax_shift));
vdd->write_reg(vp_val, vdd->vp_data->vp_common->prm_mod, vdd->vp_data->vstepmax);
vp_val = ((vdd->vp_rt_data.vlimitto_vddmax <<
vdd->vp_data->vp_common->vlimitto_vddmax_shift) |
(vdd->vp_rt_data.vlimitto_vddmin <<
vdd->vp_data->vp_common->vlimitto_vddmin_shift) |
(vdd->vp_rt_data.vlimitto_timeout <<
vdd->vp_data->vp_common->vlimitto_timeout_shift));
vdd->write_reg(vp_val, vdd->vp_data->vp_common->prm_mod, vdd->vp_data->vlimitto);
}
static void __init vdd_debugfs_init(struct voltagedomain *voltdm)
{
char *name;
@ -268,125 +163,11 @@ static void __init vdd_debugfs_init(struct voltagedomain *voltdm)
return;
}
(void) debugfs_create_x16("vp_errorgain", S_IRUGO, vdd->debug_dir,
&(vdd->vp_rt_data.vpconfig_errorgain));
(void) debugfs_create_x16("vp_smpswaittimemin", S_IRUGO,
vdd->debug_dir,
&(vdd->vp_rt_data.vstepmin_smpswaittimemin));
(void) debugfs_create_x8("vp_stepmin", S_IRUGO, vdd->debug_dir,
&(vdd->vp_rt_data.vstepmin_stepmin));
(void) debugfs_create_x16("vp_smpswaittimemax", S_IRUGO,
vdd->debug_dir,
&(vdd->vp_rt_data.vstepmax_smpswaittimemax));
(void) debugfs_create_x8("vp_stepmax", S_IRUGO, vdd->debug_dir,
&(vdd->vp_rt_data.vstepmax_stepmax));
(void) debugfs_create_x8("vp_vddmax", S_IRUGO, vdd->debug_dir,
&(vdd->vp_rt_data.vlimitto_vddmax));
(void) debugfs_create_x8("vp_vddmin", S_IRUGO, vdd->debug_dir,
&(vdd->vp_rt_data.vlimitto_vddmin));
(void) debugfs_create_x16("vp_timeout", S_IRUGO, vdd->debug_dir,
&(vdd->vp_rt_data.vlimitto_timeout));
(void) debugfs_create_file("curr_vp_volt", S_IRUGO, vdd->debug_dir,
(void *) voltdm, &vp_volt_debug_fops);
(void) debugfs_create_file("curr_nominal_volt", S_IRUGO,
vdd->debug_dir, (void *) voltdm,
&nom_volt_debug_fops);
}
/* VP force update method of voltage scaling */
static int vp_forceupdate_scale_voltage(struct voltagedomain *voltdm,
unsigned long target_volt)
{
struct omap_vdd_info *vdd = voltdm->vdd;
u32 vpconfig;
u8 target_vsel, current_vsel;
int ret, timeout = 0;
ret = omap_vc_pre_scale(voltdm, target_volt, &target_vsel, &current_vsel);
if (ret)
return ret;
/*
* Clear all pending TransactionDone interrupt/status. Typical latency
* is <3us
*/
while (timeout++ < VP_TRANXDONE_TIMEOUT) {
vdd->write_reg(vdd->vp_data->prm_irqst_data->tranxdone_status,
vdd->prm_irqst_mod, vdd->prm_irqst_reg);
if (!(vdd->read_reg(vdd->prm_irqst_mod, vdd->prm_irqst_reg) &
vdd->vp_data->prm_irqst_data->tranxdone_status))
break;
udelay(1);
}
if (timeout >= VP_TRANXDONE_TIMEOUT) {
pr_warning("%s: vdd_%s TRANXDONE timeout exceeded."
"Voltage change aborted", __func__, voltdm->name);
return -ETIMEDOUT;
}
/* Configure for VP-Force Update */
vpconfig = vdd->read_reg(vdd->vp_data->vp_common->prm_mod, vdd->vp_data->vpconfig);
vpconfig &= ~(vdd->vp_data->vp_common->vpconfig_initvdd |
vdd->vp_data->vp_common->vpconfig_forceupdate |
vdd->vp_data->vp_common->vpconfig_initvoltage_mask);
vpconfig |= ((target_vsel <<
vdd->vp_data->vp_common->vpconfig_initvoltage_shift));
vdd->write_reg(vpconfig, vdd->vp_data->vp_common->prm_mod, vdd->vp_data->vpconfig);
/* Trigger initVDD value copy to voltage processor */
vpconfig |= vdd->vp_data->vp_common->vpconfig_initvdd;
vdd->write_reg(vpconfig, vdd->vp_data->vp_common->prm_mod, vdd->vp_data->vpconfig);
/* Force update of voltage */
vpconfig |= vdd->vp_data->vp_common->vpconfig_forceupdate;
vdd->write_reg(vpconfig, vdd->vp_data->vp_common->prm_mod, vdd->vp_data->vpconfig);
/*
* Wait for TransactionDone. Typical latency is <200us.
* Depends on SMPSWAITTIMEMIN/MAX and voltage change
*/
timeout = 0;
omap_test_timeout((vdd->read_reg(vdd->prm_irqst_mod,
vdd->prm_irqst_reg) &
vdd->vp_data->prm_irqst_data->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__, voltdm->name);
omap_vc_post_scale(voltdm, 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_data->prm_irqst_data->tranxdone_status,
vdd->prm_irqst_mod, vdd->prm_irqst_reg);
if (!(vdd->read_reg(vdd->prm_irqst_mod, vdd->prm_irqst_reg) &
vdd->vp_data->prm_irqst_data->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__, voltdm->name);
vpconfig = vdd->read_reg(vdd->vp_data->vp_common->prm_mod, vdd->vp_data->vpconfig);
/* Clear initVDD copy trigger bit */
vpconfig &= ~vdd->vp_data->vp_common->vpconfig_initvdd;
vdd->write_reg(vpconfig, vdd->vp_data->vp_common->prm_mod, vdd->vp_data->vpconfig);
/* Clear force bit */
vpconfig &= ~vdd->vp_data->vp_common->vpconfig_forceupdate;
vdd->write_reg(vpconfig, vdd->vp_data->vp_common->prm_mod, vdd->vp_data->vpconfig);
return 0;
}
static int __init omap_vdd_data_configure(struct voltagedomain *voltdm)
{
struct omap_vdd_info *vdd = voltdm->vdd;
@ -438,129 +219,6 @@ unsigned long omap_voltage_get_nom_volt(struct voltagedomain *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 = voltdm->vdd;
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_data->vp_common->prm_mod, vdd->vp_data->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;
if (!voltdm || IS_ERR(voltdm)) {
pr_warning("%s: VDD specified does not exist!\n", __func__);
return;
}
vdd = voltdm->vdd;
if (!vdd->read_reg || !vdd->write_reg) {
pr_err("%s: No read/write API for accessing vdd_%s regs\n",
__func__, voltdm->name);
return;
}
/* If VP is already enabled, do nothing. Return */
if (vdd->vp_enabled)
return;
vp_latch_vsel(voltdm);
/* Enable VP */
vpconfig = vdd->read_reg(vdd->vp_data->vp_common->prm_mod, vdd->vp_data->vpconfig);
vpconfig |= vdd->vp_data->vp_common->vpconfig_vpenable;
vdd->write_reg(vpconfig, vdd->vp_data->vp_common->prm_mod, vdd->vp_data->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;
int timeout;
if (!voltdm || IS_ERR(voltdm)) {
pr_warning("%s: VDD specified does not exist!\n", __func__);
return;
}
vdd = voltdm->vdd;
if (!vdd->read_reg || !vdd->write_reg) {
pr_err("%s: No read/write API for accessing vdd_%s regs\n",
__func__, voltdm->name);
return;
}
/* 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(vdd->vp_data->vp_common->prm_mod, vdd->vp_data->vpconfig);
vpconfig &= ~vdd->vp_data->vp_common->vpconfig_vpenable;
vdd->write_reg(vpconfig, vdd->vp_data->vp_common->prm_mod, vdd->vp_data->vpconfig);
/*
* Wait for VP idle Typical latency is <2us. Maximum latency is ~100us
*/
omap_test_timeout((vdd->read_reg(vdd->vp_data->vp_common->prm_mod, vdd->vp_data->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.
@ -766,7 +424,7 @@ void omap_change_voltscale_method(struct voltagedomain *voltdm,
switch (voltscale_method) {
case VOLTSCALE_VPFORCEUPDATE:
vdd->volt_scale = vp_forceupdate_scale_voltage;
vdd->volt_scale = omap_vp_forceupdate_scale;
return;
case VOLTSCALE_VCBYPASS:
vdd->volt_scale = omap_vc_bypass_scale;
@ -810,8 +468,8 @@ int __init omap_voltage_late_init(void)
if (voltdm->vdd) {
if (omap_vdd_data_configure(voltdm))
continue;
vp_init(voltdm);
vdd_debugfs_init(voltdm);
omap_vp_init(voltdm);
}
}

3
arch/arm/mach-omap2/voltage.h
View file

@ -152,9 +152,6 @@ struct omap_vdd_info {
unsigned long target_volt);
};
unsigned long omap_vp_get_curr_volt(struct voltagedomain *voltdm);
void omap_vp_enable(struct voltagedomain *voltdm);
void omap_vp_disable(struct voltagedomain *voltdm);
int omap_voltage_scale_vdd(struct voltagedomain *voltdm,
unsigned long target_volt);
void omap_voltage_reset(struct voltagedomain *voltdm);

374
arch/arm/mach-omap2/vp.c Normal file
View file

@ -0,0 +1,374 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/debugfs.h>
#include <plat/common.h>
#include "voltage.h"
#include "vp.h"
#include "prm-regbits-34xx.h"
#include "prm-regbits-44xx.h"
#include "prm44xx.h"
static void __init vp_debugfs_init(struct voltagedomain *voltdm);
static void vp_latch_vsel(struct voltagedomain *voltdm)
{
struct omap_vp_instance_data *vp = voltdm->vdd->vp_data;
u32 vpconfig;
unsigned long uvdc;
char vsel;
struct omap_vdd_info *vdd = voltdm->vdd;
uvdc = omap_voltage_get_nom_volt(voltdm);
if (!uvdc) {
pr_warning("%s: unable to find current voltage for vdd_%s\n",
__func__, 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;
}
vsel = vdd->pmic_info->uv_to_vsel(uvdc);
vpconfig = vdd->read_reg(vp->vp_common->prm_mod, vp->vpconfig);
vpconfig &= ~(vp->vp_common->vpconfig_initvoltage_mask |
vp->vp_common->vpconfig_initvdd);
vpconfig |= vsel << vp->vp_common->vpconfig_initvoltage_shift;
vdd->write_reg(vpconfig, vp->vp_common->prm_mod, vp->vpconfig);
/* Trigger initVDD value copy to voltage processor */
vdd->write_reg((vpconfig | vp->vp_common->vpconfig_initvdd),
vp->vp_common->prm_mod, vp->vpconfig);
/* Clear initVDD copy trigger bit */
vdd->write_reg(vpconfig, vp->vp_common->prm_mod, vp->vpconfig);
}
/* Generic voltage init functions */
void __init omap_vp_init(struct voltagedomain *voltdm)
{
struct omap_vp_instance_data *vp = voltdm->vdd->vp_data;
struct omap_vdd_info *vdd = voltdm->vdd;
u32 vp_val;
if (!vdd->read_reg || !vdd->write_reg) {
pr_err("%s: No read/write API for accessing vdd_%s regs\n",
__func__, voltdm->name);
return;
}
vp_val = vdd->vp_rt_data.vpconfig_erroroffset |
(vdd->vp_rt_data.vpconfig_errorgain <<
vp->vp_common->vpconfig_errorgain_shift) |
vp->vp_common->vpconfig_timeouten;
vdd->write_reg(vp_val, vp->vp_common->prm_mod, vp->vpconfig);
vp_val = ((vdd->vp_rt_data.vstepmin_smpswaittimemin <<
vp->vp_common->vstepmin_smpswaittimemin_shift) |
(vdd->vp_rt_data.vstepmin_stepmin <<
vp->vp_common->vstepmin_stepmin_shift));
vdd->write_reg(vp_val, vp->vp_common->prm_mod, vp->vstepmin);
vp_val = ((vdd->vp_rt_data.vstepmax_smpswaittimemax <<
vp->vp_common->vstepmax_smpswaittimemax_shift) |
(vdd->vp_rt_data.vstepmax_stepmax <<
vp->vp_common->vstepmax_stepmax_shift));
vdd->write_reg(vp_val, vp->vp_common->prm_mod, vp->vstepmax);
vp_val = ((vdd->vp_rt_data.vlimitto_vddmax <<
vp->vp_common->vlimitto_vddmax_shift) |
(vdd->vp_rt_data.vlimitto_vddmin <<
vp->vp_common->vlimitto_vddmin_shift) |
(vdd->vp_rt_data.vlimitto_timeout <<
vp->vp_common->vlimitto_timeout_shift));
vdd->write_reg(vp_val, vp->vp_common->prm_mod, vp->vlimitto);
vp_debugfs_init(voltdm);
}
/* VP force update method of voltage scaling */
int omap_vp_forceupdate_scale(struct voltagedomain *voltdm,
unsigned long target_volt)
{
struct omap_vp_instance_data *vp = voltdm->vdd->vp_data;
struct omap_vdd_info *vdd = voltdm->vdd;
u32 vpconfig;
u8 target_vsel, current_vsel;
int ret, timeout = 0;
ret = omap_vc_pre_scale(voltdm, target_volt, &target_vsel, &current_vsel);
if (ret)
return ret;
/*
* Clear all pending TransactionDone interrupt/status. Typical latency
* is <3us
*/
while (timeout++ < VP_TRANXDONE_TIMEOUT) {
vdd->write_reg(vp->prm_irqst_data->tranxdone_status,
vdd->prm_irqst_mod, vdd->prm_irqst_reg);
if (!(vdd->read_reg(vdd->prm_irqst_mod, vdd->prm_irqst_reg) &
vp->prm_irqst_data->tranxdone_status))
break;
udelay(1);
}
if (timeout >= VP_TRANXDONE_TIMEOUT) {
pr_warning("%s: vdd_%s TRANXDONE timeout exceeded."
"Voltage change aborted", __func__, voltdm->name);
return -ETIMEDOUT;
}
/* Configure for VP-Force Update */
vpconfig = vdd->read_reg(vp->vp_common->prm_mod, vp->vpconfig);
vpconfig &= ~(vp->vp_common->vpconfig_initvdd |
vp->vp_common->vpconfig_forceupdate |
vp->vp_common->vpconfig_initvoltage_mask);
vpconfig |= ((target_vsel <<
vp->vp_common->vpconfig_initvoltage_shift));
vdd->write_reg(vpconfig, vp->vp_common->prm_mod, vp->vpconfig);
/* Trigger initVDD value copy to voltage processor */
vpconfig |= vp->vp_common->vpconfig_initvdd;
vdd->write_reg(vpconfig, vp->vp_common->prm_mod, vp->vpconfig);
/* Force update of voltage */
vpconfig |= vp->vp_common->vpconfig_forceupdate;
vdd->write_reg(vpconfig, vp->vp_common->prm_mod, vp->vpconfig);
/*
* Wait for TransactionDone. Typical latency is <200us.
* Depends on SMPSWAITTIMEMIN/MAX and voltage change
*/
timeout = 0;
omap_test_timeout((vdd->read_reg(vdd->prm_irqst_mod,
vdd->prm_irqst_reg) &
vp->prm_irqst_data->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__, voltdm->name);
omap_vc_post_scale(voltdm, 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(vp->prm_irqst_data->tranxdone_status,
vdd->prm_irqst_mod, vdd->prm_irqst_reg);
if (!(vdd->read_reg(vdd->prm_irqst_mod, vdd->prm_irqst_reg) &
vp->prm_irqst_data->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__, voltdm->name);
vpconfig = vdd->read_reg(vp->vp_common->prm_mod, vp->vpconfig);
/* Clear initVDD copy trigger bit */
vpconfig &= ~vp->vp_common->vpconfig_initvdd;
vdd->write_reg(vpconfig, vp->vp_common->prm_mod, vp->vpconfig);
/* Clear force bit */
vpconfig &= ~vp->vp_common->vpconfig_forceupdate;
vdd->write_reg(vpconfig, vp->vp_common->prm_mod, vp->vpconfig);
return 0;
}
/**
* 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_vp_instance_data *vp = voltdm->vdd->vp_data;
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 = voltdm->vdd;
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(vp->vp_common->prm_mod, vp->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_vp_instance_data *vp;
struct omap_vdd_info *vdd;
u32 vpconfig;
if (!voltdm || IS_ERR(voltdm)) {
pr_warning("%s: VDD specified does not exist!\n", __func__);
return;
}
vdd = voltdm->vdd;
vp = voltdm->vdd->vp_data;
if (!vdd->read_reg || !vdd->write_reg) {
pr_err("%s: No read/write API for accessing vdd_%s regs\n",
__func__, voltdm->name);
return;
}
/* If VP is already enabled, do nothing. Return */
if (vdd->vp_enabled)
return;
vp_latch_vsel(voltdm);
/* Enable VP */
vpconfig = vdd->read_reg(vp->vp_common->prm_mod, vp->vpconfig);
vpconfig |= vp->vp_common->vpconfig_vpenable;
vdd->write_reg(vpconfig, vp->vp_common->prm_mod, vp->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_vp_instance_data *vp;
struct omap_vdd_info *vdd;
u32 vpconfig;
int timeout;
if (!voltdm || IS_ERR(voltdm)) {
pr_warning("%s: VDD specified does not exist!\n", __func__);
return;
}
vdd = voltdm->vdd;
vp = voltdm->vdd->vp_data;
if (!vdd->read_reg || !vdd->write_reg) {
pr_err("%s: No read/write API for accessing vdd_%s regs\n",
__func__, voltdm->name);
return;
}
/* 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(vp->vp_common->prm_mod, vp->vpconfig);
vpconfig &= ~vp->vp_common->vpconfig_vpenable;
vdd->write_reg(vpconfig, vp->vp_common->prm_mod, vp->vpconfig);
/*
* Wait for VP idle Typical latency is <2us. Maximum latency is ~100us
*/
omap_test_timeout((vdd->read_reg(vp->vp_common->prm_mod, vp->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;
}
/* Voltage debugfs support */
static int vp_volt_debug_get(void *data, u64 *val)
{
struct voltagedomain *voltdm = (struct voltagedomain *)data;
struct omap_vp_instance_data *vp = voltdm->vdd->vp_data;
struct omap_vdd_info *vdd = voltdm->vdd;
u8 vsel;
if (!vdd) {
pr_warning("Wrong paramater passed\n");
return -EINVAL;
}
vsel = vdd->read_reg(vp->vp_common->prm_mod, vp->voltage);
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;
}
DEFINE_SIMPLE_ATTRIBUTE(vp_volt_debug_fops, vp_volt_debug_get, NULL, "%llu\n");
static void __init vp_debugfs_init(struct voltagedomain *voltdm)
{
struct omap_vdd_info *vdd = voltdm->vdd;
struct dentry *debug_dir;
debug_dir = debugfs_create_dir("vp", vdd->debug_dir);
if (IS_ERR(debug_dir))
pr_err("%s: Unable to create VP debugfs dir dir\n", __func__);
(void) debugfs_create_x16("errorgain", S_IRUGO, debug_dir,
&(vdd->vp_rt_data.vpconfig_errorgain));
(void) debugfs_create_x16("smpswaittimemin", S_IRUGO,
debug_dir,
&(vdd->vp_rt_data.vstepmin_smpswaittimemin));
(void) debugfs_create_x8("stepmin", S_IRUGO, debug_dir,
&(vdd->vp_rt_data.vstepmin_stepmin));
(void) debugfs_create_x16("smpswaittimemax", S_IRUGO,
debug_dir,
&(vdd->vp_rt_data.vstepmax_smpswaittimemax));
(void) debugfs_create_x8("stepmax", S_IRUGO, debug_dir,
&(vdd->vp_rt_data.vstepmax_stepmax));
(void) debugfs_create_x8("vddmax", S_IRUGO, debug_dir,
&(vdd->vp_rt_data.vlimitto_vddmax));
(void) debugfs_create_x8("vddmin", S_IRUGO, debug_dir,
&(vdd->vp_rt_data.vlimitto_vddmin));
(void) debugfs_create_x16("timeout", S_IRUGO, debug_dir,
&(vdd->vp_rt_data.vlimitto_timeout));
(void) debugfs_create_file("curr_volt", S_IRUGO, debug_dir,
(void *) voltdm, &vp_volt_debug_fops);
}

9
arch/arm/mach-omap2/vp.h
View file

@ -19,6 +19,8 @@
#include <linux/kernel.h>
struct voltagedomain;
/* XXX document */
#define VP_IDLE_TIMEOUT 200
#define VP_TRANXDONE_TIMEOUT 300
@ -139,4 +141,11 @@ extern struct omap_vp_instance_data omap4_vp_mpu_data;
extern struct omap_vp_instance_data omap4_vp_iva_data;
extern struct omap_vp_instance_data omap4_vp_core_data;
void omap_vp_init(struct voltagedomain *voltdm);
void omap_vp_enable(struct voltagedomain *voltdm);
void omap_vp_disable(struct voltagedomain *voltdm);
unsigned long omap_vp_get_curr_volt(struct voltagedomain *voltdm);
int omap_vp_forceupdate_scale(struct voltagedomain *voltdm,
unsigned long target_volt);
#endif