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yaml
---
r: 272722
b: refs/heads/master
c: ccd5ca7
h: refs/heads/master
v: v3
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Kevin Hilman committed Sep 15, 2011
1 parent eaa1c1c commit e7dd544
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Showing 5 changed files with 303 additions and 262 deletions.
2 changes: 1 addition & 1 deletion [refs]
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---
refs/heads/master: e69c22b1459068f15e56e48b4b6953cc3f566c79
refs/heads/master: ccd5ca7787df8f1bd267b90f03a09c31c160ffe2
2 changes: 1 addition & 1 deletion trunk/arch/arm/mach-omap2/Makefile
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Expand Up @@ -90,7 +90,7 @@ obj-$(CONFIG_ARCH_OMAP4) += prcm.o cm2xxx_3xxx.o cminst44xx.o \

# OMAP voltage domains
ifeq ($(CONFIG_PM),y)
voltagedomain-common := voltage.o
voltagedomain-common := voltage.o vc.o
obj-$(CONFIG_ARCH_OMAP2) += $(voltagedomain-common) \
voltagedomains2xxx_data.o
obj-$(CONFIG_ARCH_OMAP3) += $(voltagedomain-common) \
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285 changes: 285 additions & 0 deletions trunk/arch/arm/mach-omap2/vc.c
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/*
* OMAP Voltage Controller (VC) interface
*
* Copyright (C) 2011 Texas Instruments, Inc.
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/init.h>

#include <plat/cpu.h>

#include "voltage.h"
#include "vc.h"
#include "prm-regbits-34xx.h"
#include "prm-regbits-44xx.h"
#include "prm44xx.h"

/* Voltage scale and accessory APIs */
int omap_vc_pre_scale(struct voltagedomain *voltdm,
unsigned long target_volt,
u8 *target_vsel, u8 *current_vsel)
{
struct omap_vc_instance_data *vc = voltdm->vdd->vc_data;
struct omap_vdd_info *vdd = voltdm->vdd;
struct omap_volt_data *volt_data;
const struct omap_vc_common_data *vc_common;
const struct omap_vp_common_data *vp_common;
u32 vc_cmdval, vp_errgain_val;

vc_common = vc->vc_common;
vp_common = vdd->vp_data->vp_common;

/* Check if sufficient pmic info is available for this vdd */
if (!vdd->pmic_info) {
pr_err("%s: Insufficient pmic info to scale the vdd_%s\n",
__func__, 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__, 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__, voltdm->name);
return -EINVAL;
}

/* Get volt_data corresponding to target_volt */
volt_data = omap_voltage_get_voltdata(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(vdd->vp_data->vp_common->prm_mod, vdd->vp_data->voltage);

/* Setting the ON voltage to the new target voltage */
vc_cmdval = vdd->read_reg(vc->vc_common->prm_mod, vc->cmdval_reg);
vc_cmdval &= ~vc_common->cmd_on_mask;
vc_cmdval |= (*target_vsel << vc_common->cmd_on_shift);
vdd->write_reg(vc_cmdval, vc->vc_common->prm_mod, vc->cmdval_reg);

/* Setting vp errorgain based on the voltage */
if (volt_data) {
vp_errgain_val = vdd->read_reg(vdd->vp_data->vp_common->prm_mod,
vdd->vp_data->vpconfig);
vdd->vp_rt_data.vpconfig_errorgain = volt_data->vp_errgain;
vp_errgain_val &= ~vp_common->vpconfig_errorgain_mask;
vp_errgain_val |= vdd->vp_rt_data.vpconfig_errorgain <<
vp_common->vpconfig_errorgain_shift;
vdd->write_reg(vp_errgain_val, vdd->vp_data->vp_common->prm_mod,
vdd->vp_data->vpconfig);
}

return 0;
}

void omap_vc_post_scale(struct voltagedomain *voltdm,
unsigned long target_volt,
u8 target_vsel, u8 current_vsel)
{
struct omap_vdd_info *vdd = voltdm->vdd;
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 */
int omap_vc_bypass_scale_voltage(struct voltagedomain *voltdm,
unsigned long target_volt)
{
struct omap_vc_instance_data *vc = voltdm->vdd->vc_data;
struct omap_vdd_info *vdd = voltdm->vdd;
u32 loop_cnt = 0, retries_cnt = 0;
u32 vc_valid, vc_bypass_val_reg, vc_bypass_value;
u8 target_vsel, current_vsel;
int ret;

ret = omap_vc_pre_scale(voltdm, target_volt, &target_vsel, &current_vsel);
if (ret)
return ret;

vc_valid = vc->vc_common->valid;
vc_bypass_val_reg = vc->vc_common->bypass_val_reg;
vc_bypass_value = (target_vsel << vc->vc_common->data_shift) |
(vdd->pmic_info->pmic_reg <<
vc->vc_common->regaddr_shift) |
(vdd->pmic_info->i2c_slave_addr <<
vc->vc_common->slaveaddr_shift);

vdd->write_reg(vc_bypass_value, vc->vc_common->prm_mod, vc_bypass_val_reg);
vdd->write_reg(vc_bypass_value | vc_valid, vc->vc_common->prm_mod,
vc_bypass_val_reg);

vc_bypass_value = vdd->read_reg(vc->vc_common->prm_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(vc->vc_common->prm_mod,
vc_bypass_val_reg);
}

omap_vc_post_scale(voltdm, target_volt, target_vsel, current_vsel);
return 0;
}

static void __init omap3_vfsm_init(struct voltagedomain *voltdm)
{
struct omap_vc_instance_data *vc = voltdm->vdd->vc_data;
struct omap_vdd_info *vdd = voltdm->vdd;

/*
* Voltage Manager FSM parameters init
* XXX This data should be passed in from the board file
*/
vdd->write_reg(OMAP3_CLKSETUP, vc->vc_common->prm_mod, OMAP3_PRM_CLKSETUP_OFFSET);
vdd->write_reg(OMAP3_VOLTOFFSET, vc->vc_common->prm_mod,
OMAP3_PRM_VOLTOFFSET_OFFSET);
vdd->write_reg(OMAP3_VOLTSETUP2, vc->vc_common->prm_mod,
OMAP3_PRM_VOLTSETUP2_OFFSET);
}

static void __init omap3_vc_init_channel(struct voltagedomain *voltdm)
{
struct omap_vc_instance_data *vc = voltdm->vdd->vc_data;
struct omap_vdd_info *vdd = voltdm->vdd;
static bool is_initialized;
u8 on_vsel, onlp_vsel, ret_vsel, off_vsel;
u32 vc_val;

if (is_initialized)
return;

/* 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 << vc->vc_common->cmd_on_shift) |
(onlp_vsel << vc->vc_common->cmd_onlp_shift) |
(ret_vsel << vc->vc_common->cmd_ret_shift) |
(off_vsel << vc->vc_common->cmd_off_shift));
vdd->write_reg(vc_val, vc->vc_common->prm_mod, vc->cmdval_reg);

/*
* Generic VC parameters init
* XXX This data should be abstracted out
*/
vdd->write_reg(OMAP3430_CMD1_MASK | OMAP3430_RAV1_MASK, vc->vc_common->prm_mod,
OMAP3_PRM_VC_CH_CONF_OFFSET);
vdd->write_reg(OMAP3430_MCODE_SHIFT | OMAP3430_HSEN_MASK, vc->vc_common->prm_mod,
OMAP3_PRM_VC_I2C_CFG_OFFSET);

omap3_vfsm_init(voltdm);

is_initialized = true;
}


/* OMAP4 specific voltage init functions */
static void __init omap4_vc_init_channel(struct voltagedomain *voltdm)
{
struct omap_vc_instance_data *vc = voltdm->vdd->vc_data;
struct omap_vdd_info *vdd = voltdm->vdd;
static bool is_initialized;
u32 vc_val;

if (is_initialized)
return;

/* TODO: Configure setup times and CMD_VAL values*/

/*
* Generic VC parameters init
* XXX This data should be abstracted out
*/
vc_val = (OMAP4430_RAV_VDD_MPU_L_MASK | OMAP4430_CMD_VDD_MPU_L_MASK |
OMAP4430_RAV_VDD_IVA_L_MASK | OMAP4430_CMD_VDD_IVA_L_MASK |
OMAP4430_RAV_VDD_CORE_L_MASK | OMAP4430_CMD_VDD_CORE_L_MASK);
vdd->write_reg(vc_val, vc->vc_common->prm_mod, OMAP4_PRM_VC_CFG_CHANNEL_OFFSET);

/* XXX These are magic numbers and do not belong! */
vc_val = (0x60 << OMAP4430_SCLL_SHIFT | 0x26 << OMAP4430_SCLH_SHIFT);
vdd->write_reg(vc_val, vc->vc_common->prm_mod, OMAP4_PRM_VC_CFG_I2C_CLK_OFFSET);

is_initialized = true;
}

void __init omap_vc_init_channel(struct voltagedomain *voltdm)
{
struct omap_vc_instance_data *vc = voltdm->vdd->vc_data;
struct omap_vdd_info *vdd = voltdm->vdd;
u32 vc_val;

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__, voltdm->name);
return;
}

if (!vdd->read_reg || !vdd->write_reg) {
pr_err("%s: No read/write API for accessing vdd_%s regs\n",
__func__, voltdm->name);
return;
}

/* Set up the SMPS_SA(i2c slave address in VC */
vc_val = vdd->read_reg(vc->vc_common->prm_mod,
vc->vc_common->smps_sa_reg);
vc_val &= ~vc->smps_sa_mask;
vc_val |= vdd->pmic_info->i2c_slave_addr << vc->smps_sa_shift;
vdd->write_reg(vc_val, vc->vc_common->prm_mod,
vc->vc_common->smps_sa_reg);

/* Setup the VOLRA(pmic reg addr) in VC */
vc_val = vdd->read_reg(vc->vc_common->prm_mod,
vc->vc_common->smps_volra_reg);
vc_val &= ~vc->smps_volra_mask;
vc_val |= vdd->pmic_info->pmic_reg << vc->smps_volra_shift;
vdd->write_reg(vc_val, vc->vc_common->prm_mod,
vc->vc_common->smps_volra_reg);

/* Configure the setup times */
vc_val = vdd->read_reg(vc->vc_common->prm_mod, vdd->vfsm->voltsetup_reg);
vc_val &= ~vdd->vfsm->voltsetup_mask;
vc_val |= vdd->pmic_info->volt_setup_time <<
vdd->vfsm->voltsetup_shift;
vdd->write_reg(vc_val, vc->vc_common->prm_mod, vdd->vfsm->voltsetup_reg);

if (cpu_is_omap34xx())
omap3_vc_init_channel(voltdm);
else if (cpu_is_omap44xx())
omap4_vc_init_channel(voltdm);
}

12 changes: 12 additions & 0 deletions trunk/arch/arm/mach-omap2/vc.h
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Expand Up @@ -19,6 +19,8 @@

#include <linux/kernel.h>

struct voltagedomain;

/**
* struct omap_vc_common_data - per-VC register/bitfield data
* @cmd_on_mask: ON bitmask in PRM_VC_CMD_VAL* register
Expand Down Expand Up @@ -81,5 +83,15 @@ extern struct omap_vc_instance_data omap4_vc_mpu_data;
extern struct omap_vc_instance_data omap4_vc_iva_data;
extern struct omap_vc_instance_data omap4_vc_core_data;

void omap_vc_init_channel(struct voltagedomain *voltdm);
int omap_vc_pre_scale(struct voltagedomain *voltdm,
unsigned long target_volt,
u8 *target_vsel, u8 *current_vsel);
void omap_vc_post_scale(struct voltagedomain *voltdm,
unsigned long target_volt,
u8 target_vsel, u8 current_vsel);
int omap_vc_bypass_scale_voltage(struct voltagedomain *voltdm,
unsigned long target_volt);

#endif

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