| Message ID | 20200725231834.25642-8-michael@walle.cc (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add support for Kontron sl28cpld | expand |
On Sun, Jul 26, 2020 at 01:18:28AM +0200, Michael Walle wrote: > Add support for the GPIO controller of the sl28 board management > controller. This driver is part of a multi-function device. > > A controller has 8 lines. There are three different flavors: > full-featured GPIO with interrupt support, input-only and output-only. FWIW, Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> > Signed-off-by: Michael Walle <michael@walle.cc> > Reviewed-by: Linus Walleij <linus.walleij@linaro.org> > --- > Changes since v5: > - added "select REGMAP_IRQ" > > Changes since v4: > - update copyright year > - remove #include <linux/of_device.h>, suggested by Andy. > - use device_get_match_data(), suggested by Andy. > - drop the irq_support variable, instead call _init_irq() directly, > suggested by Andy. > - also move the irq code a bit around to make it look nicer > - drop "struct sl28cpld_gpio". We don't need to actually store the > irq_chip and irq_chip_data, everything is device resource managed. > - use 100 chars line limit, suggested by Andy. > - remove the platform device table > - don't use KBUID_MODNAME > > Changes since v3: > - see cover letter > > drivers/gpio/Kconfig | 12 +++ > drivers/gpio/Makefile | 1 + > drivers/gpio/gpio-sl28cpld.c | 161 +++++++++++++++++++++++++++++++++++ > 3 files changed, 174 insertions(+) > create mode 100644 drivers/gpio/gpio-sl28cpld.c > > diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig > index 8030fd91a3cc..f6a547b76432 100644 > --- a/drivers/gpio/Kconfig > +++ b/drivers/gpio/Kconfig > @@ -1223,6 +1223,18 @@ config GPIO_RC5T583 > This driver provides the support for driving/reading the gpio pins > of RC5T583 device through standard gpio library. > > +config GPIO_SL28CPLD > + tristate "Kontron sl28cpld GPIO support" > + select MFD_SIMPLE_MFD_I2C > + select GPIO_REGMAP > + select GPIOLIB_IRQCHIP > + select REGMAP_IRQ > + help > + This enables support for the GPIOs found on the Kontron sl28 CPLD. > + > + This driver can also be built as a module. If so, the module will be > + called gpio-sl28cpld. > + > config GPIO_STMPE > bool "STMPE GPIOs" > depends on MFD_STMPE > diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile > index 4f9abff4f2dc..c3a4e7c94a91 100644 > --- a/drivers/gpio/Makefile > +++ b/drivers/gpio/Makefile > @@ -132,6 +132,7 @@ obj-$(CONFIG_GPIO_SCH311X) += gpio-sch311x.o > obj-$(CONFIG_GPIO_SCH) += gpio-sch.o > obj-$(CONFIG_GPIO_SIFIVE) += gpio-sifive.o > obj-$(CONFIG_GPIO_SIOX) += gpio-siox.o > +obj-$(CONFIG_GPIO_SL28CPLD) += gpio-sl28cpld.o > obj-$(CONFIG_GPIO_SODAVILLE) += gpio-sodaville.o > obj-$(CONFIG_GPIO_SPEAR_SPICS) += gpio-spear-spics.o > obj-$(CONFIG_GPIO_SPRD) += gpio-sprd.o > diff --git a/drivers/gpio/gpio-sl28cpld.c b/drivers/gpio/gpio-sl28cpld.c > new file mode 100644 > index 000000000000..889b8f5622c2 > --- /dev/null > +++ b/drivers/gpio/gpio-sl28cpld.c > @@ -0,0 +1,161 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* > + * sl28cpld GPIO driver > + * > + * Copyright 2020 Michael Walle <michael@walle.cc> > + */ > + > +#include <linux/device.h> > +#include <linux/gpio/driver.h> > +#include <linux/gpio/regmap.h> > +#include <linux/interrupt.h> > +#include <linux/kernel.h> > +#include <linux/mod_devicetable.h> > +#include <linux/module.h> > +#include <linux/platform_device.h> > +#include <linux/regmap.h> > + > +/* GPIO flavor */ > +#define GPIO_REG_DIR 0x00 > +#define GPIO_REG_OUT 0x01 > +#define GPIO_REG_IN 0x02 > +#define GPIO_REG_IE 0x03 > +#define GPIO_REG_IP 0x04 > + > +/* input-only flavor */ > +#define GPI_REG_IN 0x00 > + > +/* output-only flavor */ > +#define GPO_REG_OUT 0x00 > + > +enum sl28cpld_gpio_type { > + SL28CPLD_GPIO = 1, > + SL28CPLD_GPI, > + SL28CPLD_GPO, > +}; > + > +static const struct regmap_irq sl28cpld_gpio_irqs[] = { > + REGMAP_IRQ_REG_LINE(0, 8), > + REGMAP_IRQ_REG_LINE(1, 8), > + REGMAP_IRQ_REG_LINE(2, 8), > + REGMAP_IRQ_REG_LINE(3, 8), > + REGMAP_IRQ_REG_LINE(4, 8), > + REGMAP_IRQ_REG_LINE(5, 8), > + REGMAP_IRQ_REG_LINE(6, 8), > + REGMAP_IRQ_REG_LINE(7, 8), > +}; > + > +static int sl28cpld_gpio_irq_init(struct platform_device *pdev, > + unsigned int base, > + struct gpio_regmap_config *config) > +{ > + struct regmap_irq_chip_data *irq_data; > + struct regmap_irq_chip *irq_chip; > + struct device *dev = &pdev->dev; > + int irq, ret; > + > + if (!device_property_read_bool(dev, "interrupt-controller")) > + return 0; > + > + irq = platform_get_irq(pdev, 0); > + if (irq < 0) > + return irq; > + > + irq_chip = devm_kzalloc(dev, sizeof(*irq_chip), GFP_KERNEL); > + if (!irq_chip) > + return -ENOMEM; > + > + irq_chip->name = "sl28cpld-gpio-irq", > + irq_chip->irqs = sl28cpld_gpio_irqs; > + irq_chip->num_irqs = ARRAY_SIZE(sl28cpld_gpio_irqs); > + irq_chip->num_regs = 1; > + irq_chip->status_base = base + GPIO_REG_IP; > + irq_chip->mask_base = base + GPIO_REG_IE; > + irq_chip->mask_invert = true, > + irq_chip->ack_base = base + GPIO_REG_IP; > + > + ret = devm_regmap_add_irq_chip_fwnode(dev, dev_fwnode(dev), > + config->regmap, irq, > + IRQF_SHARED | IRQF_ONESHOT, > + 0, irq_chip, &irq_data); > + if (ret) > + return ret; > + > + config->irq_domain = regmap_irq_get_domain(irq_data); > + > + return 0; > +} > + > +static int sl28cpld_gpio_probe(struct platform_device *pdev) > +{ > + struct gpio_regmap_config config = {0}; > + enum sl28cpld_gpio_type type; > + struct regmap *regmap; > + u32 base; > + int ret; > + > + if (!pdev->dev.parent) > + return -ENODEV; > + > + type = (uintptr_t)device_get_match_data(&pdev->dev); > + if (!type) > + return -ENODEV; > + > + ret = device_property_read_u32(&pdev->dev, "reg", &base); > + if (ret) > + return -EINVAL; > + > + regmap = dev_get_regmap(pdev->dev.parent, NULL); > + if (!regmap) > + return -ENODEV; > + > + config.regmap = regmap; > + config.parent = &pdev->dev; > + config.ngpio = 8; > + > + switch (type) { > + case SL28CPLD_GPIO: > + config.reg_dat_base = base + GPIO_REG_IN; > + config.reg_set_base = base + GPIO_REG_OUT; > + /* reg_dir_out_base might be zero */ > + config.reg_dir_out_base = GPIO_REGMAP_ADDR(base + GPIO_REG_DIR); > + > + /* This type supports interrupts */ > + ret = sl28cpld_gpio_irq_init(pdev, base, &config); > + if (ret) > + return ret; > + break; > + case SL28CPLD_GPO: > + config.reg_set_base = base + GPO_REG_OUT; > + break; > + case SL28CPLD_GPI: > + config.reg_dat_base = base + GPI_REG_IN; > + break; > + default: > + dev_err(&pdev->dev, "unknown type %d\n", type); > + return -ENODEV; > + } > + > + return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(&pdev->dev, &config)); > +} > + > +static const struct of_device_id sl28cpld_gpio_of_match[] = { > + { .compatible = "kontron,sl28cpld-gpio", .data = (void *)SL28CPLD_GPIO }, > + { .compatible = "kontron,sl28cpld-gpi", .data = (void *)SL28CPLD_GPI }, > + { .compatible = "kontron,sl28cpld-gpo", .data = (void *)SL28CPLD_GPO }, > + {} > +}; > +MODULE_DEVICE_TABLE(of, sl28cpld_gpio_of_match); > + > +static struct platform_driver sl28cpld_gpio_driver = { > + .probe = sl28cpld_gpio_probe, > + .driver = { > + .name = "sl28cpld-gpio", > + .of_match_table = sl28cpld_gpio_of_match, > + }, > +}; > +module_platform_driver(sl28cpld_gpio_driver); > + > +MODULE_DESCRIPTION("sl28cpld GPIO Driver"); > +MODULE_AUTHOR("Michael Walle <michael@walle.cc>"); > +MODULE_LICENSE("GPL"); > -- > 2.20.1 >
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 8030fd91a3cc..f6a547b76432 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -1223,6 +1223,18 @@ config GPIO_RC5T583 This driver provides the support for driving/reading the gpio pins of RC5T583 device through standard gpio library. +config GPIO_SL28CPLD + tristate "Kontron sl28cpld GPIO support" + select MFD_SIMPLE_MFD_I2C + select GPIO_REGMAP + select GPIOLIB_IRQCHIP + select REGMAP_IRQ + help + This enables support for the GPIOs found on the Kontron sl28 CPLD. + + This driver can also be built as a module. If so, the module will be + called gpio-sl28cpld. + config GPIO_STMPE bool "STMPE GPIOs" depends on MFD_STMPE diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 4f9abff4f2dc..c3a4e7c94a91 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -132,6 +132,7 @@ obj-$(CONFIG_GPIO_SCH311X) += gpio-sch311x.o obj-$(CONFIG_GPIO_SCH) += gpio-sch.o obj-$(CONFIG_GPIO_SIFIVE) += gpio-sifive.o obj-$(CONFIG_GPIO_SIOX) += gpio-siox.o +obj-$(CONFIG_GPIO_SL28CPLD) += gpio-sl28cpld.o obj-$(CONFIG_GPIO_SODAVILLE) += gpio-sodaville.o obj-$(CONFIG_GPIO_SPEAR_SPICS) += gpio-spear-spics.o obj-$(CONFIG_GPIO_SPRD) += gpio-sprd.o diff --git a/drivers/gpio/gpio-sl28cpld.c b/drivers/gpio/gpio-sl28cpld.c new file mode 100644 index 000000000000..889b8f5622c2 --- /dev/null +++ b/drivers/gpio/gpio-sl28cpld.c @@ -0,0 +1,161 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * sl28cpld GPIO driver + * + * Copyright 2020 Michael Walle <michael@walle.cc> + */ + +#include <linux/device.h> +#include <linux/gpio/driver.h> +#include <linux/gpio/regmap.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> + +/* GPIO flavor */ +#define GPIO_REG_DIR 0x00 +#define GPIO_REG_OUT 0x01 +#define GPIO_REG_IN 0x02 +#define GPIO_REG_IE 0x03 +#define GPIO_REG_IP 0x04 + +/* input-only flavor */ +#define GPI_REG_IN 0x00 + +/* output-only flavor */ +#define GPO_REG_OUT 0x00 + +enum sl28cpld_gpio_type { + SL28CPLD_GPIO = 1, + SL28CPLD_GPI, + SL28CPLD_GPO, +}; + +static const struct regmap_irq sl28cpld_gpio_irqs[] = { + REGMAP_IRQ_REG_LINE(0, 8), + REGMAP_IRQ_REG_LINE(1, 8), + REGMAP_IRQ_REG_LINE(2, 8), + REGMAP_IRQ_REG_LINE(3, 8), + REGMAP_IRQ_REG_LINE(4, 8), + REGMAP_IRQ_REG_LINE(5, 8), + REGMAP_IRQ_REG_LINE(6, 8), + REGMAP_IRQ_REG_LINE(7, 8), +}; + +static int sl28cpld_gpio_irq_init(struct platform_device *pdev, + unsigned int base, + struct gpio_regmap_config *config) +{ + struct regmap_irq_chip_data *irq_data; + struct regmap_irq_chip *irq_chip; + struct device *dev = &pdev->dev; + int irq, ret; + + if (!device_property_read_bool(dev, "interrupt-controller")) + return 0; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + irq_chip = devm_kzalloc(dev, sizeof(*irq_chip), GFP_KERNEL); + if (!irq_chip) + return -ENOMEM; + + irq_chip->name = "sl28cpld-gpio-irq", + irq_chip->irqs = sl28cpld_gpio_irqs; + irq_chip->num_irqs = ARRAY_SIZE(sl28cpld_gpio_irqs); + irq_chip->num_regs = 1; + irq_chip->status_base = base + GPIO_REG_IP; + irq_chip->mask_base = base + GPIO_REG_IE; + irq_chip->mask_invert = true, + irq_chip->ack_base = base + GPIO_REG_IP; + + ret = devm_regmap_add_irq_chip_fwnode(dev, dev_fwnode(dev), + config->regmap, irq, + IRQF_SHARED | IRQF_ONESHOT, + 0, irq_chip, &irq_data); + if (ret) + return ret; + + config->irq_domain = regmap_irq_get_domain(irq_data); + + return 0; +} + +static int sl28cpld_gpio_probe(struct platform_device *pdev) +{ + struct gpio_regmap_config config = {0}; + enum sl28cpld_gpio_type type; + struct regmap *regmap; + u32 base; + int ret; + + if (!pdev->dev.parent) + return -ENODEV; + + type = (uintptr_t)device_get_match_data(&pdev->dev); + if (!type) + return -ENODEV; + + ret = device_property_read_u32(&pdev->dev, "reg", &base); + if (ret) + return -EINVAL; + + regmap = dev_get_regmap(pdev->dev.parent, NULL); + if (!regmap) + return -ENODEV; + + config.regmap = regmap; + config.parent = &pdev->dev; + config.ngpio = 8; + + switch (type) { + case SL28CPLD_GPIO: + config.reg_dat_base = base + GPIO_REG_IN; + config.reg_set_base = base + GPIO_REG_OUT; + /* reg_dir_out_base might be zero */ + config.reg_dir_out_base = GPIO_REGMAP_ADDR(base + GPIO_REG_DIR); + + /* This type supports interrupts */ + ret = sl28cpld_gpio_irq_init(pdev, base, &config); + if (ret) + return ret; + break; + case SL28CPLD_GPO: + config.reg_set_base = base + GPO_REG_OUT; + break; + case SL28CPLD_GPI: + config.reg_dat_base = base + GPI_REG_IN; + break; + default: + dev_err(&pdev->dev, "unknown type %d\n", type); + return -ENODEV; + } + + return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(&pdev->dev, &config)); +} + +static const struct of_device_id sl28cpld_gpio_of_match[] = { + { .compatible = "kontron,sl28cpld-gpio", .data = (void *)SL28CPLD_GPIO }, + { .compatible = "kontron,sl28cpld-gpi", .data = (void *)SL28CPLD_GPI }, + { .compatible = "kontron,sl28cpld-gpo", .data = (void *)SL28CPLD_GPO }, + {} +}; +MODULE_DEVICE_TABLE(of, sl28cpld_gpio_of_match); + +static struct platform_driver sl28cpld_gpio_driver = { + .probe = sl28cpld_gpio_probe, + .driver = { + .name = "sl28cpld-gpio", + .of_match_table = sl28cpld_gpio_of_match, + }, +}; +module_platform_driver(sl28cpld_gpio_driver); + +MODULE_DESCRIPTION("sl28cpld GPIO Driver"); +MODULE_AUTHOR("Michael Walle <michael@walle.cc>"); +MODULE_LICENSE("GPL");