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OMAP4: Register voltage PMIC parameters with the voltage layer
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TWL6030 is the power IC used along with OMAP4 in OMAP4 SDPs,
blaze boards and panda boards. This patch registers the OMAP4
PMIC specific information with the voltage layer.
This also involves implementing a different formula for
voltage to vsel and vsel to voltage calculations from
TWL4030.

Signed-off-by: Thara Gopinath <thara@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
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Thara Gopinath authored and Kevin Hilman committed Dec 22, 2010
1 parent 1482d8b commit 7bc3ed9
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166 changes: 166 additions & 0 deletions arch/arm/mach-omap2/omap_twl.c
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@
#include <linux/err.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/i2c/twl.h>

#include <plat/voltage.h>

Expand All @@ -37,6 +38,28 @@
#define OMAP3630_VP2_VLIMITTO_VDDMIN 0x18
#define OMAP3630_VP2_VLIMITTO_VDDMAX 0x30

#define OMAP4_SRI2C_SLAVE_ADDR 0x12
#define OMAP4_VDD_MPU_SR_VOLT_REG 0x55
#define OMAP4_VDD_IVA_SR_VOLT_REG 0x5B
#define OMAP4_VDD_CORE_SR_VOLT_REG 0x61

#define OMAP4_VP_CONFIG_ERROROFFSET 0x00
#define OMAP4_VP_VSTEPMIN_VSTEPMIN 0x01
#define OMAP4_VP_VSTEPMAX_VSTEPMAX 0x04
#define OMAP4_VP_VLIMITTO_TIMEOUT_US 200

#define OMAP4_VP_MPU_VLIMITTO_VDDMIN 0xA
#define OMAP4_VP_MPU_VLIMITTO_VDDMAX 0x39
#define OMAP4_VP_IVA_VLIMITTO_VDDMIN 0xA
#define OMAP4_VP_IVA_VLIMITTO_VDDMAX 0x2D
#define OMAP4_VP_CORE_VLIMITTO_VDDMIN 0xA
#define OMAP4_VP_CORE_VLIMITTO_VDDMAX 0x28

static bool is_offset_valid;
static u8 smps_offset;

#define REG_SMPS_OFFSET 0xE0

unsigned long twl4030_vsel_to_uv(const u8 vsel)
{
return (((vsel * 125) + 6000)) * 100;
Expand All @@ -47,6 +70,70 @@ u8 twl4030_uv_to_vsel(unsigned long uv)
return DIV_ROUND_UP(uv - 600000, 12500);
}

unsigned long twl6030_vsel_to_uv(const u8 vsel)
{
/*
* In TWL6030 depending on the value of SMPS_OFFSET
* efuse register the voltage range supported in
* standard mode can be either between 0.6V - 1.3V or
* 0.7V - 1.4V. In TWL6030 ES1.0 SMPS_OFFSET efuse
* is programmed to all 0's where as starting from
* TWL6030 ES1.1 the efuse is programmed to 1
*/
if (!is_offset_valid) {
twl_i2c_read_u8(TWL6030_MODULE_ID0, &smps_offset,
REG_SMPS_OFFSET);
is_offset_valid = true;
}

/*
* There is no specific formula for voltage to vsel
* conversion above 1.3V. There are special hardcoded
* values for voltages above 1.3V. Currently we are
* hardcoding only for 1.35 V which is used for 1GH OPP for
* OMAP4430.
*/
if (vsel == 0x3A)
return 1350000;

if (smps_offset & 0x8)
return ((((vsel - 1) * 125) + 7000)) * 100;
else
return ((((vsel - 1) * 125) + 6000)) * 100;
}

u8 twl6030_uv_to_vsel(unsigned long uv)
{
/*
* In TWL6030 depending on the value of SMPS_OFFSET
* efuse register the voltage range supported in
* standard mode can be either between 0.6V - 1.3V or
* 0.7V - 1.4V. In TWL6030 ES1.0 SMPS_OFFSET efuse
* is programmed to all 0's where as starting from
* TWL6030 ES1.1 the efuse is programmed to 1
*/
if (!is_offset_valid) {
twl_i2c_read_u8(TWL6030_MODULE_ID0, &smps_offset,
REG_SMPS_OFFSET);
is_offset_valid = true;
}

/*
* There is no specific formula for voltage to vsel
* conversion above 1.3V. There are special hardcoded
* values for voltages above 1.3V. Currently we are
* hardcoding only for 1.35 V which is used for 1GH OPP for
* OMAP4430.
*/
if (uv == 1350000)
return 0x3A;

if (smps_offset & 0x8)
return DIV_ROUND_UP(uv - 700000, 12500) + 1;
else
return DIV_ROUND_UP(uv - 600000, 12500) + 1;
}

static struct omap_volt_pmic_info omap3_mpu_volt_info = {
.slew_rate = 4000,
.step_size = 12500,
Expand Down Expand Up @@ -87,6 +174,85 @@ static struct omap_volt_pmic_info omap3_core_volt_info = {
.uv_to_vsel = twl4030_uv_to_vsel,
};

static struct omap_volt_pmic_info omap4_mpu_volt_info = {
.slew_rate = 4000,
.step_size = 12500,
.on_volt = 1350000,
.onlp_volt = 1350000,
.ret_volt = 837500,
.off_volt = 600000,
.volt_setup_time = 0,
.vp_erroroffset = OMAP4_VP_CONFIG_ERROROFFSET,
.vp_vstepmin = OMAP4_VP_VSTEPMIN_VSTEPMIN,
.vp_vstepmax = OMAP4_VP_VSTEPMAX_VSTEPMAX,
.vp_vddmin = OMAP4_VP_MPU_VLIMITTO_VDDMIN,
.vp_vddmax = OMAP4_VP_MPU_VLIMITTO_VDDMAX,
.vp_timeout_us = OMAP4_VP_VLIMITTO_TIMEOUT_US,
.i2c_slave_addr = OMAP4_SRI2C_SLAVE_ADDR,
.pmic_reg = OMAP4_VDD_MPU_SR_VOLT_REG,
.vsel_to_uv = twl6030_vsel_to_uv,
.uv_to_vsel = twl6030_uv_to_vsel,
};

static struct omap_volt_pmic_info omap4_iva_volt_info = {
.slew_rate = 4000,
.step_size = 12500,
.on_volt = 1100000,
.onlp_volt = 1100000,
.ret_volt = 837500,
.off_volt = 600000,
.volt_setup_time = 0,
.vp_erroroffset = OMAP4_VP_CONFIG_ERROROFFSET,
.vp_vstepmin = OMAP4_VP_VSTEPMIN_VSTEPMIN,
.vp_vstepmax = OMAP4_VP_VSTEPMAX_VSTEPMAX,
.vp_vddmin = OMAP4_VP_IVA_VLIMITTO_VDDMIN,
.vp_vddmax = OMAP4_VP_IVA_VLIMITTO_VDDMAX,
.vp_timeout_us = OMAP4_VP_VLIMITTO_TIMEOUT_US,
.i2c_slave_addr = OMAP4_SRI2C_SLAVE_ADDR,
.pmic_reg = OMAP4_VDD_IVA_SR_VOLT_REG,
.vsel_to_uv = twl6030_vsel_to_uv,
.uv_to_vsel = twl6030_uv_to_vsel,
};

static struct omap_volt_pmic_info omap4_core_volt_info = {
.slew_rate = 4000,
.step_size = 12500,
.on_volt = 1100000,
.onlp_volt = 1100000,
.ret_volt = 837500,
.off_volt = 600000,
.volt_setup_time = 0,
.vp_erroroffset = OMAP4_VP_CONFIG_ERROROFFSET,
.vp_vstepmin = OMAP4_VP_VSTEPMIN_VSTEPMIN,
.vp_vstepmax = OMAP4_VP_VSTEPMAX_VSTEPMAX,
.vp_vddmin = OMAP4_VP_CORE_VLIMITTO_VDDMIN,
.vp_vddmax = OMAP4_VP_CORE_VLIMITTO_VDDMAX,
.vp_timeout_us = OMAP4_VP_VLIMITTO_TIMEOUT_US,
.i2c_slave_addr = OMAP4_SRI2C_SLAVE_ADDR,
.pmic_reg = OMAP4_VDD_CORE_SR_VOLT_REG,
.vsel_to_uv = twl6030_vsel_to_uv,
.uv_to_vsel = twl6030_uv_to_vsel,
};

int __init omap4_twl_init(void)
{
struct voltagedomain *voltdm;

if (!cpu_is_omap44xx())
return -ENODEV;

voltdm = omap_voltage_domain_lookup("mpu");
omap_voltage_register_pmic(voltdm, &omap4_mpu_volt_info);

voltdm = omap_voltage_domain_lookup("iva");
omap_voltage_register_pmic(voltdm, &omap4_iva_volt_info);

voltdm = omap_voltage_domain_lookup("core");
omap_voltage_register_pmic(voltdm, &omap4_core_volt_info);

return 0;
}

int __init omap3_twl_init(void)
{
struct voltagedomain *voltdm;
Expand Down
1 change: 1 addition & 0 deletions arch/arm/mach-omap2/pm.c
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Original file line number Diff line number Diff line change
Expand Up @@ -240,6 +240,7 @@ static int __init omap2_common_pm_late_init(void)
{
/* Init the OMAP TWL parameters */
omap3_twl_init();
omap4_twl_init();

/* Init the voltage layer */
omap_voltage_late_init();
Expand Down
5 changes: 5 additions & 0 deletions arch/arm/mach-omap2/pm.h
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Original file line number Diff line number Diff line change
Expand Up @@ -126,11 +126,16 @@ static inline void omap_enable_smartreflex_on_init(void) {}

#ifdef CONFIG_TWL4030_CORE
extern int omap3_twl_init(void);
extern int omap4_twl_init(void);
#else
static inline int omap3_twl_init(void)
{
return -EINVAL;
}
static inline int omap4_twl_init(void)
{
return -EINVAL;
}
#endif

#endif

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