| Message ID | 1435683249.23818.62.camel@codethink.co.uk (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi Ben, Thank you for the patch. On Tuesday 30 June 2015 17:54:09 Ben Hutchings wrote: > All the SHDIs can operate with either 3.3V or 1.8V signals, depending > on negotiation with the card. > > Implement the {get,set}_io_voltage operations and set the related > capability flag for the associated pins. > > Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk> > --- > drivers/pinctrl/sh-pfc/core.c | 2 +- > drivers/pinctrl/sh-pfc/core.h | 1 + > drivers/pinctrl/sh-pfc/pfc-r8a7790.c | 71 ++++++++++++++++++++++++++++++++- > 3 files changed, 72 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..ec6657de6a46 > 100644 > --- a/drivers/pinctrl/sh-pfc/pfc-r8a7790.c > +++ b/drivers/pinctrl/sh-pfc/pfc-r8a7790.c > @@ -21,6 +21,7 @@ > * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 > USA */ > > +#include <linux/io.h> > #include <linux/kernel.h> > #include <linux/platform_data/gpio-rcar.h> > > @@ -1739,10 +1740,20 @@ 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_IO_VOLTAGE(bank, _pin, _name, sfx) \ > + [RCAR_GP_PIN(bank, _pin)].configs = SH_PFC_PIN_CFG_IO_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 both 3.3V and 1.8V signalling. > + */ > + PORT_GP_32(3, PIN_IO_VOLTAGE, unused), > + > + /* Pins not associated with a GPIO port, placed after all the GPIOs */ > + [RCAR_GP_PIN(5, 31) + 1] = I'm sorry but I still don't like this. gcc outputs a warning when overriding an initializer if you enable -Wextra, which leads me to believe this construct is dubious. It should at least be tested with LLVM. I'd much prefer replacing PINMUX_GPIO_GP_ALL() with a version that will initialize the pins correctly right away. Another option which might be better would be to add a new operation to retrieve the pin config bitmask instead of storing it in sh_pfc_pin. Most SoCs don't have per-pin config bitmasks, so we could save a bit of memory by doing so. r8a73a4 and r8a7790 could easily compute the bitmask in C code, while sh73a0 and r8a7740 would have a private table. The drawback would be a slightly increased execution time. > 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 +4606,58 @@ static const char * const vin3_groups[] = { > "vin3_clk", > }; > > +static int sdhi_get_io_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)) The function name is wrong. You could use __func__, but as WARN() will output a backtrace I think you can just drop it. And given that this shouldn't happen at all given that only port 3 pins have the IO_VOLTAGE flag set, I'd just drop the warning completely. Same for shdi_set_io_voltage(). > + return -EIO; > + > + /* 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 = ioread32(mapped_reg); > + > + return (data & mask) ? 3300 : 1800; > +} > + > +static int > +sdhi_set_io_voltage(struct sh_pfc *pfc, unsigned int pin, u16 voltage_mV) > +{ > + void __iomem *mapped_reg; > + u32 data, mask; > + > + if (WARN(pin < RCAR_GP_PIN(3, 0) || pin > RCAR_GP_PIN(3, 31), > + "invalid pin %#x", pin)) > + return -EIO; > + > + if (voltage_mV != 1800 && voltage_mV != 3300) > + return -EINVAL; > + > + /* 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 = ioread32(mapped_reg); > + > + if (voltage_mV == 3300) > + data |= mask; > + else > + data &= ~mask; > + > + iowrite32(~data, sh_pfc_phys_to_virt(pfc, pfc->info->unlock_reg)); > + iowrite32(data, mapped_reg); > + > + return 0; > +} > + > static const struct sh_pfc_function pinmux_functions[] = { > SH_PFC_FUNCTION(audio_clk), > SH_PFC_FUNCTION(avb), > @@ -5586,8 +5649,14 @@ static const struct pinmux_cfg_reg > pinmux_config_regs[] = { { }, > }; > > +static const struct sh_pfc_soc_operations pinmux_ops = { > + .get_io_voltage = sdhi_get_io_voltage, > + .set_io_voltage = sdhi_set_io_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 },
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..ec6657de6a46 100644 --- a/drivers/pinctrl/sh-pfc/pfc-r8a7790.c +++ b/drivers/pinctrl/sh-pfc/pfc-r8a7790.c @@ -21,6 +21,7 @@ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ +#include <linux/io.h> #include <linux/kernel.h> #include <linux/platform_data/gpio-rcar.h> @@ -1739,10 +1740,20 @@ 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_IO_VOLTAGE(bank, _pin, _name, sfx) \ + [RCAR_GP_PIN(bank, _pin)].configs = SH_PFC_PIN_CFG_IO_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 both 3.3V and 1.8V signalling. + */ + PORT_GP_32(3, PIN_IO_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 +4606,58 @@ static const char * const vin3_groups[] = { "vin3_clk", }; +static int sdhi_get_io_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 -EIO; + + /* 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 = ioread32(mapped_reg); + + return (data & mask) ? 3300 : 1800; +} + +static int +sdhi_set_io_voltage(struct sh_pfc *pfc, unsigned int pin, u16 voltage_mV) +{ + void __iomem *mapped_reg; + u32 data, mask; + + if (WARN(pin < RCAR_GP_PIN(3, 0) || pin > RCAR_GP_PIN(3, 31), + "invalid pin %#x", pin)) + return -EIO; + + if (voltage_mV != 1800 && voltage_mV != 3300) + return -EINVAL; + + /* 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 = ioread32(mapped_reg); + + if (voltage_mV == 3300) + data |= mask; + else + data &= ~mask; + + iowrite32(~data, sh_pfc_phys_to_virt(pfc, pfc->info->unlock_reg)); + iowrite32(data, mapped_reg); + + return 0; +} + static const struct sh_pfc_function pinmux_functions[] = { SH_PFC_FUNCTION(audio_clk), SH_PFC_FUNCTION(avb), @@ -5586,8 +5649,14 @@ static const struct pinmux_cfg_reg pinmux_config_regs[] = { { }, }; +static const struct sh_pfc_soc_operations pinmux_ops = { + .get_io_voltage = sdhi_get_io_voltage, + .set_io_voltage = sdhi_set_io_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 },
All the SHDIs can operate with either 3.3V or 1.8V signals, depending on negotiation with the card. Implement the {get,set}_io_voltage operations and set the related capability flag for the associated pins. Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk> --- drivers/pinctrl/sh-pfc/core.c | 2 +- drivers/pinctrl/sh-pfc/core.h | 1 + drivers/pinctrl/sh-pfc/pfc-r8a7790.c | 71 +++++++++++++++++++++++++++++++++++- 3 files changed, 72 insertions(+), 2 deletions(-)