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>
diff --git a/drivers/pinctrl/sh-pfc/pfc-sh73a0.c b/drivers/pinctrl/sh-pfc/pfc-sh73a0.c
index 587f777..b783724 100644
--- a/drivers/pinctrl/sh-pfc/pfc-sh73a0.c
+++ b/drivers/pinctrl/sh-pfc/pfc-sh73a0.c
@@ -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 @@
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 @@
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,
};