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regulator: mc13783: consider Power Gates as digital regulators.

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GPO regulators are digital outputs that can be enabled or disabled by a
dedicated bit in mc13783 POWERMISC register.
In this family can be count in also Power Gates (PWGT1 and 2): enabled by
a dedicated pin a Power Gate is an hardware driven supply where the output
(PWGTnDRV) follow this law:

 Bit PWGTxSPIEN | Pin PWGTxEN | PWGTxDRV |  Read Back
   0 = default  |             |          | PWGTxSPIEN
 ---------------+-------------+----------+------------
       1        |      x      |   Low    |     0
       0        |      0      |   High   |     1
       0        |      1      |   Low    |     0

As read back value of control bit reflects the PWGTxDRV state (not the
control value previously written) and mc13783 POWERMISC register contain
only regulator related bits, a dedicated function to manage these bits is
created here with the aim of tracing the real value of PWGTxSPIEN bits
and reproduce it on next writes.

All POWERMISC users _must_ use the new function to not accidentally
disable Power Gates supplies.

v2 changes:
-Better utilization of abstraction layers.
-Voltage query support. GPO's and PWGTxDRV are fixed voltage regulator
 with voltage value of 3.1V and 5.5V respectively.

Signed-off-by: Alberto Panizzo <maramaopercheseimorto@gmail.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
This commit is contained in:
Alberto Panizzo 2010-01-19 12:48:54 +01:00 committed by Liam Girdwood
parent eda79a3041
commit f4b97b36b7
2 changed files with 128 additions and 6 deletions
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132
drivers/regulator/mc13783-regulator.c
View file

@ -82,6 +82,11 @@
#define MC13783_REG_POWERMISC_GPO2EN (1 << 8)
#define MC13783_REG_POWERMISC_GPO3EN (1 << 10)
#define MC13783_REG_POWERMISC_GPO4EN (1 << 12)
#define MC13783_REG_POWERMISC_PWGT1SPIEN (1 << 15)
#define MC13783_REG_POWERMISC_PWGT2SPIEN (1 << 16)
#define MC13783_REG_POWERMISC_PWGTSPI_M (3 << 15)
struct mc13783_regulator {
struct regulator_desc desc;
@ -161,8 +166,17 @@ static const int const mc13783_vrf_val[] = {
1500000, 1875000, 2700000, 2775000,
};
static const int const mc13783_gpo_val[] = {
3100000,
};
static const int const mc13783_pwgtdrv_val[] = {
5500000,
};
static struct regulator_ops mc13783_regulator_ops;
static struct regulator_ops mc13783_fixed_regulator_ops;
static struct regulator_ops mc13783_gpo_regulator_ops;
#define MC13783_DEFINE(prefix, _name, _reg, _vsel_reg, _voltages) \
[MC13783_ ## prefix ## _ ## _name] = { \
@ -197,17 +211,19 @@ static struct regulator_ops mc13783_fixed_regulator_ops;
.voltages = _voltages, \
}
#define MC13783_GPO_DEFINE(prefix, _name, _reg) \
#define MC13783_GPO_DEFINE(prefix, _name, _reg, _voltages) \
[MC13783_ ## prefix ## _ ## _name] = { \
.desc = { \
.name = #prefix "_" #_name, \
.ops = &mc13783_regulator_ops, \
.n_voltages = ARRAY_SIZE(_voltages), \
.ops = &mc13783_gpo_regulator_ops, \
.type = REGULATOR_VOLTAGE, \
.id = MC13783_ ## prefix ## _ ## _name, \
.owner = THIS_MODULE, \
}, \
.reg = MC13783_REG_ ## _reg, \
.enable_bit = MC13783_REG_ ## _reg ## _ ## _name ## EN, \
.voltages = _voltages, \
}
#define MC13783_DEFINE_SW(_name, _reg, _vsel_reg, _voltages) \
@ -249,14 +265,17 @@ static struct mc13783_regulator mc13783_regulators[] = {
mc13783_vmmc_val),
MC13783_DEFINE_REGU(VMMC2, REGULATORMODE1, REGULATORSETTING1, \
mc13783_vmmc_val),
MC13783_GPO_DEFINE(REGU, GPO1, POWERMISC),
MC13783_GPO_DEFINE(REGU, GPO2, POWERMISC),
MC13783_GPO_DEFINE(REGU, GPO3, POWERMISC),
MC13783_GPO_DEFINE(REGU, GPO4, POWERMISC),
MC13783_GPO_DEFINE(REGU, GPO1, POWERMISC, mc13783_gpo_val),
MC13783_GPO_DEFINE(REGU, GPO2, POWERMISC, mc13783_gpo_val),
MC13783_GPO_DEFINE(REGU, GPO3, POWERMISC, mc13783_gpo_val),
MC13783_GPO_DEFINE(REGU, GPO4, POWERMISC, mc13783_gpo_val),
MC13783_GPO_DEFINE(REGU, PWGT1SPI, POWERMISC, mc13783_pwgtdrv_val),
MC13783_GPO_DEFINE(REGU, PWGT2SPI, POWERMISC, mc13783_pwgtdrv_val),
};
struct mc13783_regulator_priv {
struct mc13783 *mc13783;
u32 powermisc_pwgt_state;
struct regulator_dev *regulators[];
};
@ -445,6 +464,107 @@ static struct regulator_ops mc13783_fixed_regulator_ops = {
.get_voltage = mc13783_fixed_regulator_get_voltage,
};
int mc13783_powermisc_rmw(struct mc13783_regulator_priv *priv, u32 mask,
u32 val)
{
struct mc13783 *mc13783 = priv->mc13783;
int ret;
u32 valread;
BUG_ON(val & ~mask);
ret = mc13783_reg_read(mc13783, MC13783_REG_POWERMISC, &valread);
if (ret)
return ret;
/* Update the stored state for Power Gates. */
priv->powermisc_pwgt_state =
(priv->powermisc_pwgt_state & ~mask) | val;
priv->powermisc_pwgt_state &= MC13783_REG_POWERMISC_PWGTSPI_M;
/* Construct the new register value */
valread = (valread & ~mask) | val;
/* Overwrite the PWGTxEN with the stored version */
valread = (valread & ~MC13783_REG_POWERMISC_PWGTSPI_M) |
priv->powermisc_pwgt_state;
return mc13783_reg_write(mc13783, MC13783_REG_POWERMISC, valread);
}
static int mc13783_gpo_regulator_enable(struct regulator_dev *rdev)
{
struct mc13783_regulator_priv *priv = rdev_get_drvdata(rdev);
int id = rdev_get_id(rdev);
int ret;
u32 en_val = mc13783_regulators[id].enable_bit;
dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
/* Power Gate enable value is 0 */
if (id == MC13783_REGU_PWGT1SPI ||
id == MC13783_REGU_PWGT2SPI)
en_val = 0;
mc13783_lock(priv->mc13783);
ret = mc13783_powermisc_rmw(priv, mc13783_regulators[id].enable_bit,
en_val);
mc13783_unlock(priv->mc13783);
return ret;
}
static int mc13783_gpo_regulator_disable(struct regulator_dev *rdev)
{
struct mc13783_regulator_priv *priv = rdev_get_drvdata(rdev);
int id = rdev_get_id(rdev);
int ret;
u32 dis_val = 0;
dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
/* Power Gate disable value is 1 */
if (id == MC13783_REGU_PWGT1SPI ||
id == MC13783_REGU_PWGT2SPI)
dis_val = mc13783_regulators[id].enable_bit;
mc13783_lock(priv->mc13783);
ret = mc13783_powermisc_rmw(priv, mc13783_regulators[id].enable_bit,
dis_val);
mc13783_unlock(priv->mc13783);
return ret;
}
static int mc13783_gpo_regulator_is_enabled(struct regulator_dev *rdev)
{
struct mc13783_regulator_priv *priv = rdev_get_drvdata(rdev);
int ret, id = rdev_get_id(rdev);
unsigned int val;
mc13783_lock(priv->mc13783);
ret = mc13783_reg_read(priv->mc13783, mc13783_regulators[id].reg, &val);
mc13783_unlock(priv->mc13783);
if (ret)
return ret;
/* Power Gates state is stored in powermisc_pwgt_state
* where the meaning of bits is negated */
val = (val & ~MC13783_REG_POWERMISC_PWGTSPI_M) |
(priv->powermisc_pwgt_state ^ MC13783_REG_POWERMISC_PWGTSPI_M);
return (val & mc13783_regulators[id].enable_bit) != 0;
}
static struct regulator_ops mc13783_gpo_regulator_ops = {
.enable = mc13783_gpo_regulator_enable,
.disable = mc13783_gpo_regulator_disable,
.is_enabled = mc13783_gpo_regulator_is_enabled,
.list_voltage = mc13783_regulator_list_voltage,
.set_voltage = mc13783_fixed_regulator_set_voltage,
.get_voltage = mc13783_fixed_regulator_get_voltage,
};
static int __devinit mc13783_regulator_probe(struct platform_device *pdev)
{
struct mc13783_regulator_priv *priv;

2
include/linux/mfd/mc13783.h
View file

@ -108,6 +108,8 @@ int mc13783_adc_do_conversion(struct mc13783 *mc13783, unsigned int mode,
#define MC13783_REGU_V2 28
#define MC13783_REGU_V3 29
#define MC13783_REGU_V4 30
#define MC13783_REGU_PWGT1SPI 31
#define MC13783_REGU_PWGT2SPI 32
#define MC13783_IRQ_ADCDONE 0
#define MC13783_IRQ_ADCBISDONE 1