All the SHDIs can operate with either 3.3V or 1.8V signals, depending
on negotiation with the card.
Implement the {get,set}_low_voltage operations and set the low-voltage
capability flag for the associated pins.
Signed-off-by: Ben Hutchings <ben.hutchings@xxxxxxxxxxxxxxx>
---
drivers/pinctrl/sh-pfc/core.c | 2 +-
drivers/pinctrl/sh-pfc/core.h | 1 +
drivers/pinctrl/sh-pfc/pfc-r8a7790.c | 67 +++++++++++++++++++++++++++++++++++-
3 files changed, 68 insertions(+), 2 deletions(-)
diff --git a/drivers/pinctrl/sh-pfc/core.c b/drivers/pinctrl/sh-pfc/core.c
index 7b2c9495c383..7d51f96afc9a 100644
--- a/drivers/pinctrl/sh-pfc/core.c
+++ b/drivers/pinctrl/sh-pfc/core.c
@@ -92,7 +92,7 @@ static int sh_pfc_map_resources(struct sh_pfc *pfc,
return 0;
}
-static void __iomem *sh_pfc_phys_to_virt(struct sh_pfc *pfc, u32 reg)
+void __iomem *sh_pfc_phys_to_virt(struct sh_pfc *pfc, u32 reg)
{
struct sh_pfc_window *window;
phys_addr_t address = reg;
diff --git a/drivers/pinctrl/sh-pfc/core.h b/drivers/pinctrl/sh-pfc/core.h
index 6dc8a6fc2746..af355629c5d2 100644
--- a/drivers/pinctrl/sh-pfc/core.h
+++ b/drivers/pinctrl/sh-pfc/core.h
@@ -57,6 +57,7 @@ int sh_pfc_unregister_gpiochip(struct sh_pfc *pfc);
int sh_pfc_register_pinctrl(struct sh_pfc *pfc);
int sh_pfc_unregister_pinctrl(struct sh_pfc *pfc);
+void __iomem *sh_pfc_phys_to_virt(struct sh_pfc *pfc, u32 address);
u32 sh_pfc_read_raw_reg(void __iomem *mapped_reg, unsigned int reg_width);
void sh_pfc_write_raw_reg(void __iomem *mapped_reg, unsigned int reg_width,
u32 data);
diff --git a/drivers/pinctrl/sh-pfc/pfc-r8a7790.c b/drivers/pinctrl/sh-pfc/pfc-r8a7790.c
index 22a5470889f5..38be7cbea4ca 100644
--- a/drivers/pinctrl/sh-pfc/pfc-r8a7790.c
+++ b/drivers/pinctrl/sh-pfc/pfc-r8a7790.c
@@ -1739,10 +1739,20 @@ static const u16 pinmux_data[] = {
#define PIN_NUMBER(r, c) (((r) - 'A') * 31 + (c) + 200)
#define PIN_A_NUMBER(r, c) PIN_NUMBER(ROW_GROUP_A(r), c)
+#define PIN_LOW_VOLTAGE(bank, _pin, _name, sfx) \
+ [RCAR_GP_PIN(bank, _pin)].configs = SH_PFC_PIN_CFG_LOW_VOLTAGE
+
static const struct sh_pfc_pin pinmux_pins[] = {
PINMUX_GPIO_GP_ALL(),
- /* Pins not associated with a GPIO port */
+ /*
+ * All pins assigned to GPIO bank 3 can be used for SD interfaces
+ * in which case they support low voltage (1.8V) signalling.
+ */
+ PORT_GP_32(3, PIN_LOW_VOLTAGE, unused),
+
+ /* Pins not associated with a GPIO port, placed after all the GPIOs */
+ [RCAR_GP_PIN(5, 31) + 1] =
SH_PFC_PIN_NAMED(ROW_GROUP_A('F'), 15, AF15),
SH_PFC_PIN_NAMED(ROW_GROUP_A('G'), 15, AG15),
SH_PFC_PIN_NAMED(ROW_GROUP_A('H'), 15, AH15),
@@ -4595,6 +4605,55 @@ static const char * const vin3_groups[] = {
"vin3_clk",
};
+static bool sdhi_get_low_voltage(struct sh_pfc *pfc, unsigned int pin)
+{
+ void __iomem *mapped_reg;
+ u32 data, mask;
+
+ if (WARN(pin < RCAR_GP_PIN(3, 0) || pin > RCAR_GP_PIN(3, 31),
+ "sdhi_get_low_voltage: invalid pin %#x", pin))
+ return 0;
+
+ /* Map IOCTRL6 */
+ mapped_reg = sh_pfc_phys_to_virt(pfc, 0xe606008c);
+
+ /* Bits in IOCTRL6 are numbered in opposite order to pins */
+ mask = 0x80000000 >> (pin & 0x1f);
+
+ data = sh_pfc_read_raw_reg(mapped_reg, 32);
+
+ return !(data & mask);
+}
+
+static void
+sdhi_set_low_voltage(struct sh_pfc *pfc, unsigned int pin, bool low)
+{
+ void __iomem *mapped_reg;
+ u32 data, mask;
+
+ if (WARN(pin < RCAR_GP_PIN(3, 0) || pin > RCAR_GP_PIN(3, 31),
+ "sdhi_set_low_voltage: invalid pin %#x", pin))
+ return;
+
+ /* Map IOCTRL6 */
+ mapped_reg = sh_pfc_phys_to_virt(pfc, 0xe606008c);
+
+ /* Bits in IOCTRL6 are numbered in opposite order to pins */
+ mask = 0x80000000 >> (pin & 0x1f);
+
+ data = sh_pfc_read_raw_reg(mapped_reg, 32);
+
+ if (low)
+ data &= ~mask;
+ else
+ data |= mask;
+
+ sh_pfc_write_raw_reg(
+ sh_pfc_phys_to_virt(pfc, pfc->info->unlock_reg), 32,
+ ~data);
+ sh_pfc_write_raw_reg(mapped_reg, 32, data);
+}
+
static const struct sh_pfc_function pinmux_functions[] = {
SH_PFC_FUNCTION(audio_clk),
SH_PFC_FUNCTION(avb),
@@ -5586,8 +5645,14 @@ static const struct pinmux_cfg_reg pinmux_config_regs[] = {
{ },
};
+static const struct sh_pfc_soc_operations pinmux_ops = {
+ .get_low_voltage = sdhi_get_low_voltage,
+ .set_low_voltage = sdhi_set_low_voltage,
+};
+
const struct sh_pfc_soc_info r8a7790_pinmux_info = {
.name = "r8a77900_pfc",
+ .ops = &pinmux_ops,
.unlock_reg = 0xe6060000, /* PMMR */
.function = { PINMUX_FUNCTION_BEGIN, PINMUX_FUNCTION_END },
--
2.1.4
--
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