sh-pfc: sh73a0: Add VCCQ MC0 regulator

The sh73a0 has an internal power gate on the VCCQ power supply for the
SDHI0 device that is controlled (for some strange reason) by a bit in a
PFC register. This feature should be exposed as a regulator.

As the same register is also used for pin control purposes there is no
way to achieve atomic read/write sequences with a separate regulator
driver. We thus need to implement the regulator here.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Laurent Pinchart 2013-04-21 23:26:26 +02:00 committed by Simon Horman
parent 0c151062f3
commit ea770ad2ec
2 changed files with 135 additions and 0 deletions

View File

@ -72,6 +72,7 @@ config PINCTRL_PFC_SH73A0
def_bool y
depends on ARCH_SH73A0
select PINCTRL_SH_PFC
select REGULATOR
config PINCTRL_PFC_SH7720
def_bool y

View File

@ -20,7 +20,11 @@
*/
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/slab.h>
#include <mach/sh73a0.h>
#include <mach/irqs.h>
@ -3888,6 +3892,92 @@ static const struct pinmux_irq pinmux_irqs[] = {
PINMUX_IRQ(EXT_IRQ16L(9), 308),
};
/* -----------------------------------------------------------------------------
* VCCQ MC0 regulator
*/
static void sh73a0_vccq_mc0_endisable(struct regulator_dev *reg, bool enable)
{
struct sh_pfc *pfc = reg->reg_data;
void __iomem *addr = pfc->window[1].virt + 4;
unsigned long flags;
u32 value;
spin_lock_irqsave(&pfc->lock, flags);
value = ioread32(addr);
if (enable)
value |= BIT(28);
else
value &= ~BIT(28);
iowrite32(value, addr);
spin_unlock_irqrestore(&pfc->lock, flags);
}
static int sh73a0_vccq_mc0_enable(struct regulator_dev *reg)
{
sh73a0_vccq_mc0_endisable(reg, true);
return 0;
}
static int sh73a0_vccq_mc0_disable(struct regulator_dev *reg)
{
sh73a0_vccq_mc0_endisable(reg, false);
return 0;
}
static int sh73a0_vccq_mc0_is_enabled(struct regulator_dev *reg)
{
struct sh_pfc *pfc = reg->reg_data;
void __iomem *addr = pfc->window[1].virt + 4;
unsigned long flags;
u32 value;
spin_lock_irqsave(&pfc->lock, flags);
value = ioread32(addr);
spin_unlock_irqrestore(&pfc->lock, flags);
return !!(value & BIT(28));
}
static int sh73a0_vccq_mc0_get_voltage(struct regulator_dev *reg)
{
return 3300000;
}
static struct regulator_ops sh73a0_vccq_mc0_ops = {
.enable = sh73a0_vccq_mc0_enable,
.disable = sh73a0_vccq_mc0_disable,
.is_enabled = sh73a0_vccq_mc0_is_enabled,
.get_voltage = sh73a0_vccq_mc0_get_voltage,
};
static const struct regulator_desc sh73a0_vccq_mc0_desc = {
.owner = THIS_MODULE,
.name = "vccq_mc0",
.type = REGULATOR_VOLTAGE,
.ops = &sh73a0_vccq_mc0_ops,
};
static struct regulator_consumer_supply sh73a0_vccq_mc0_consumers[] = {
REGULATOR_SUPPLY("vqmmc", "sh_mobile_sdhi.0"),
};
static const struct regulator_init_data sh73a0_vccq_mc0_init_data = {
.constraints = {
.valid_ops_mask = REGULATOR_CHANGE_STATUS,
},
.num_consumer_supplies = ARRAY_SIZE(sh73a0_vccq_mc0_consumers),
.consumer_supplies = sh73a0_vccq_mc0_consumers,
};
/* -----------------------------------------------------------------------------
* Pin bias
*/
#define PORTnCR_PULMD_OFF (0 << 6)
#define PORTnCR_PULMD_DOWN (2 << 6)
#define PORTnCR_PULMD_UP (3 << 6)
@ -3934,7 +4024,51 @@ static void sh73a0_pinmux_set_bias(struct sh_pfc *pfc, unsigned int pin,
iowrite8(value, addr);
}
/* -----------------------------------------------------------------------------
* SoC information
*/
struct sh73a0_pinmux_data {
struct regulator_dev *vccq_mc0;
};
static int sh73a0_pinmux_soc_init(struct sh_pfc *pfc)
{
struct sh73a0_pinmux_data *data;
struct regulator_config cfg = { };
int ret;
data = devm_kzalloc(pfc->dev, sizeof(*data), GFP_KERNEL);
if (data == NULL)
return -ENOMEM;
cfg.dev = pfc->dev;
cfg.init_data = &sh73a0_vccq_mc0_init_data;
cfg.driver_data = pfc;
data->vccq_mc0 = regulator_register(&sh73a0_vccq_mc0_desc, &cfg);
if (IS_ERR(data->vccq_mc0)) {
ret = PTR_ERR(data->vccq_mc0);
dev_err(pfc->dev, "Failed to register VCCQ MC0 regulator: %d\n",
ret);
return ret;
}
pfc->soc_data = data;
return 0;
}
static void sh73a0_pinmux_soc_exit(struct sh_pfc *pfc)
{
struct sh73a0_pinmux_data *data = pfc->soc_data;
regulator_unregister(data->vccq_mc0);
}
static const struct sh_pfc_soc_operations sh73a0_pinmux_ops = {
.init = sh73a0_pinmux_soc_init,
.exit = sh73a0_pinmux_soc_exit,
.get_bias = sh73a0_pinmux_get_bias,
.set_bias = sh73a0_pinmux_set_bias,
};