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A new function gpio_generic_chip_port_init() allows to configure them. Add an io_port field to struct gpio_generic_chip to distinguish PMIO from MMIO chips during initialization and select the proper register accessors. Signed-off-by: Jose Javier Rodriguez Barbarin --- drivers/gpio/gpio-mmio.c | 30 ++++++++++++++++++++++++-- include/linux/gpio/generic.h | 41 ++++++++++++++++++++++++++++++++++++ 2 files changed, 69 insertions(+), 2 deletions(-) diff --git a/drivers/gpio/gpio-mmio.c b/drivers/gpio/gpio-mmio.c index d23c5d275e6b..01e2afd8d6f1 100644 --- a/drivers/gpio/gpio-mmio.c +++ b/drivers/gpio/gpio-mmio.c @@ -740,8 +740,12 @@ static int gpio_generic_chip_init_common(struct gpio_generic_chip *chip, if (ret) return ret; - ret = gpio_mmio_setup_accessors(dev, chip, - flags & GPIO_GENERIC_BIG_ENDIAN_BYTE_ORDER); + if (chip->io_port) + ret = gpio_port_setup_accessors(dev, chip, + flags & GPIO_GENERIC_BIG_ENDIAN_BYTE_ORDER); + else + ret = gpio_mmio_setup_accessors(dev, chip, + flags & GPIO_GENERIC_BIG_ENDIAN_BYTE_ORDER); if (ret) return ret; @@ -801,11 +805,33 @@ int gpio_generic_chip_init(struct gpio_generic_chip *chip, chip->reg_clr.mmio = cfg->clr; chip->reg_dir_in.mmio = cfg->dirin; chip->reg_dir_out.mmio = cfg->dirout; + chip->io_port = true; return gpio_generic_chip_init_common(chip, cfg->sz, cfg->flags, cfg->dev); } EXPORT_SYMBOL_GPL(gpio_generic_chip_init); +/** + * gpio_generic_chip_port_init() - Initialize a generic GPIO chip for I/O port devices + * @chip: Generic GPIO chip to set up. + * @cfg: Generic GPIO chip configuration. + * + * Returns 0 on success, negative error number on failure. + */ +int gpio_generic_chip_port_init(struct gpio_generic_chip *chip, + const struct gpio_generic_chip_port_config *cfg) +{ + chip->reg_dat.port = cfg->dat; + chip->reg_set.port = cfg->set; + chip->reg_clr.port = cfg->clr; + chip->reg_dir_in.port = cfg->dirin; + chip->reg_dir_out.port = cfg->dirout; + chip->io_port = true; + + return gpio_generic_chip_init_common(chip, cfg->sz, cfg->flags, cfg->dev); +} +EXPORT_SYMBOL_GPL(gpio_generic_chip_port_init); + #if IS_ENABLED(CONFIG_GPIO_GENERIC_PLATFORM) static void __iomem *gpio_mmio_map(struct platform_device *pdev, diff --git a/include/linux/gpio/generic.h b/include/linux/gpio/generic.h index 30f0d87422e9..93ce5f09c0d3 100644 --- a/include/linux/gpio/generic.h +++ b/include/linux/gpio/generic.h @@ -56,6 +56,43 @@ struct gpio_generic_chip_config { unsigned long flags; }; +/** + * struct gpio_generic_chip_port_config - Generic GPIO chip configuration data for I/O port devices + * @dev: Parent device of the new GPIO chip (compulsory). + * @sz: Size (width) of the PMIO registers in bytes, typically 1, 2 or 4. + * @dat: PMIO address for the register to READ the value of the GPIO lines, it + * is expected that a 1 in the corresponding bit in this register means + * the line is asserted. + * @set: PMIO address for the register to SET the value of the GPIO lines, it + * is expected that we write the line with 1 in this register to drive + * the GPIO line high. + * @clr: PMIO address for the register to CLEAR the value of the GPIO lines, + * it is expected that we write the line with 1 in this register to + * drive the GPIO line low. It is allowed to leave this address as NULL, + * in that case the SET register will be assumed to also clear the GPIO + * lines, by actively writing the line with 0. + * @dirout: PMIO address for the register to set the line as OUTPUT. It is + * assumed that setting a line to 1 in this register will turn that + * line into an output line. Conversely, setting the line to 0 will + * turn that line into an input. + * @dirin: PMIO address for the register to set this line as INPUT. It is + * assumed that setting a line to 1 in this register will turn that + * line into an input line. Conversely, setting the line to 0 will + * turn that line into an output. + * @flags: Different flags that will affect the behaviour of the device, such + * as endianness etc. + */ +struct gpio_generic_chip_port_config { + struct device *dev; + unsigned long sz; + unsigned long dat; + unsigned long set; + unsigned long clr; + unsigned long dirout; + unsigned long dirin; + unsigned long flags; +}; + /** * union gpio_chip_reg - Generic GPIO chip register descriptor for MMIO or port-mapped I/O * @mmio: MMIO register address. @@ -79,6 +116,7 @@ union gpio_chip_reg { * representing line 0, bit 30 is line 1 ... bit 0 is line 31) this * is set to true by the generic GPIO core. It is for internal * housekeeping only. + * @io_port: indicates that the device is I/O port-mapped * @reg_dat: data (in) register for generic GPIO * @reg_set: output set register (out=high) for generic GPIO * @reg_clr: output clear register (out=low) for generic GPIO @@ -100,6 +138,7 @@ struct gpio_generic_chip { unsigned long (*read_reg)(union gpio_chip_reg *reg); void (*write_reg)(union gpio_chip_reg *reg, unsigned long data); bool be_bits; + bool io_port; union gpio_chip_reg reg_dat; union gpio_chip_reg reg_set; union gpio_chip_reg reg_clr; @@ -122,6 +161,8 @@ to_gpio_generic_chip(struct gpio_chip *gc) int gpio_generic_chip_init(struct gpio_generic_chip *chip, const struct gpio_generic_chip_config *cfg); +int gpio_generic_chip_port_init(struct gpio_generic_chip *chip, + const struct gpio_generic_chip_port_config *cfg); /** * gpio_generic_chip_set() - Set the GPIO line value of the generic GPIO chip. * @chip: Generic GPIO chip to use. -- 2.53.0