On 17.08.21 12:11, Antony Pavlov wrote: > This patch adds driver to support GPIO functionality > for 74xx-compatible ICs with MMIO access. > > Compatible models include: > 1 bit: 741G125 (Input), 741G74 (Output) > 2 bits: 742G125 (Input), 7474 (Output) > 4 bits: 74125 (Input), 74175 (Output) > 6 bits: 74365 (Input), 74174 (Output) > 8 bits: 74244 (Input), 74273 (Output) > 16 bits: 741624 (Input), 7416374 (Output) > > Signed-off-by: Antony Pavlov <[email protected]> > Cc: Alexander Shiyan <[email protected]>
Acked-by: Ahmad Fatoum <[email protected]> > --- > drivers/gpio/Kconfig | 14 +++ > drivers/gpio/Makefile | 1 + > drivers/gpio/gpio-74xx-mmio.c | 165 ++++++++++++++++++++++++++++++++++ > 3 files changed, 180 insertions(+) > > diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig > index 98a44fbbb5..f79c9ea67d 100644 > --- a/drivers/gpio/Kconfig > +++ b/drivers/gpio/Kconfig > @@ -21,6 +21,20 @@ config GPIO_74164 > shift registers. This driver can be used to provide access > to more gpio outputs. > > +config GPIO_74XX_MMIO > + tristate "GPIO driver for 74xx-ICs with MMIO access" > + depends on OFDEVICE > + select GPIO_GENERIC > + help > + Say yes here to support GPIO functionality for 74xx-compatible ICs > + with MMIO access. Compatible models include: > + 1 bit: 741G125 (Input), 741G74 (Output) > + 2 bits: 742G125 (Input), 7474 (Output) > + 4 bits: 74125 (Input), 74175 (Output) > + 6 bits: 74365 (Input), 74174 (Output) > + 8 bits: 74244 (Input), 74273 (Output) > + 16 bits: 741624 (Input), 7416374 (Output) > + > config GPIO_CLPS711X > bool "GPIO support for CLPS711X" > depends on ARCH_CLPS711X || COMPILE_TEST > diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile > index 638cbb19a3..023973cb63 100644 > --- a/drivers/gpio/Makefile > +++ b/drivers/gpio/Makefile > @@ -1,6 +1,7 @@ > obj-$(CONFIG_GPIOLIB) += gpiolib.o > > obj-$(CONFIG_GPIO_74164) += gpio-74164.o > +obj-$(CONFIG_GPIO_74XX_MMIO) += gpio-74xx-mmio.o > obj-$(CONFIG_MACH_MIPS_ATH79) += gpio-ath79.o > obj-$(CONFIG_GPIO_DAVINCI) += gpio-davinci.o > obj-$(CONFIG_GPIO_CLPS711X) += gpio-clps711x.o > diff --git a/drivers/gpio/gpio-74xx-mmio.c b/drivers/gpio/gpio-74xx-mmio.c > new file mode 100644 > index 0000000000..5b688f4766 > --- /dev/null > +++ b/drivers/gpio/gpio-74xx-mmio.c > @@ -0,0 +1,165 @@ > +// SPDX-License-Identifier: GPL-2.0-or-later > +/* > + * 74xx MMIO GPIO driver > + * > + * Copyright (C) 2014 Alexander Shiyan <[email protected]> > + * > + * Ported to barebox from linux-v5.4-rc6 > + * Copyright (C) 2019-2021 Antony Pavlov <[email protected]> > + * > + */ > + > +#include <common.h> > +#include <driver.h> > +#include <errno.h> > +#include <gpio.h> > +#include <init.h> > +#include <io.h> > +#include <malloc.h> > +#include <of_device.h> > + > +#include <linux/err.h> > +#include <linux/basic_mmio_gpio.h> > + > +#define MMIO_74XX_DIR_IN (0 << 8) > +#define MMIO_74XX_DIR_OUT (1 << 8) > +#define MMIO_74XX_BIT_CNT(x) ((x) & 0xff) > + > +struct mmio_74xx_gpio_priv { > + struct bgpio_chip bgc; > + unsigned int flags; > +}; > + > +static const struct of_device_id mmio_74xx_gpio_ids[] = { > + { > + .compatible = "ti,741g125", > + .data = (const void *)(MMIO_74XX_DIR_IN | 1), > + }, > + { > + .compatible = "ti,742g125", > + .data = (const void *)(MMIO_74XX_DIR_IN | 2), > + }, > + { > + .compatible = "ti,74125", > + .data = (const void *)(MMIO_74XX_DIR_IN | 4), > + }, > + { > + .compatible = "ti,74365", > + .data = (const void *)(MMIO_74XX_DIR_IN | 6), > + }, > + { > + .compatible = "ti,74244", > + .data = (const void *)(MMIO_74XX_DIR_IN | 8), > + }, > + { > + .compatible = "ti,741624", > + .data = (const void *)(MMIO_74XX_DIR_IN | 16), > + }, > + { > + .compatible = "ti,741g74", > + .data = (const void *)(MMIO_74XX_DIR_OUT | 1), > + }, > + { > + .compatible = "ti,7474", > + .data = (const void *)(MMIO_74XX_DIR_OUT | 2), > + }, > + { > + .compatible = "ti,74175", > + .data = (const void *)(MMIO_74XX_DIR_OUT | 4), > + }, > + { > + .compatible = "ti,74174", > + .data = (const void *)(MMIO_74XX_DIR_OUT | 6), > + }, > + { > + .compatible = "ti,74273", > + .data = (const void *)(MMIO_74XX_DIR_OUT | 8), > + }, > + { > + .compatible = "ti,7416374", > + .data = (const void *)(MMIO_74XX_DIR_OUT | 16), > + }, > + { } > +}; > + > +static inline > +struct mmio_74xx_gpio_priv *to_mmio_74xx_gpio_priv(struct gpio_chip *gc) > +{ > + struct bgpio_chip *bgc = > + container_of(gc, struct bgpio_chip, gc); > + > + return container_of(bgc, struct mmio_74xx_gpio_priv, bgc); > +} > + > +static int mmio_74xx_get_direction(struct gpio_chip *gc, unsigned int offset) > +{ > + struct mmio_74xx_gpio_priv *priv = to_mmio_74xx_gpio_priv(gc); > + > + if (priv->flags & MMIO_74XX_DIR_OUT) > + return GPIOF_DIR_OUT; > + > + return GPIOF_DIR_IN; > +} > + > +static int mmio_74xx_dir_in(struct gpio_chip *gc, unsigned int gpio) > +{ > + struct mmio_74xx_gpio_priv *priv = to_mmio_74xx_gpio_priv(gc); > + > + return (priv->flags & MMIO_74XX_DIR_OUT) ? -ENOTSUPP : 0; > +} > + > +static int mmio_74xx_dir_out(struct gpio_chip *gc, unsigned int gpio, int > val) > +{ > + struct mmio_74xx_gpio_priv *priv = to_mmio_74xx_gpio_priv(gc); > + > + if (priv->flags & MMIO_74XX_DIR_OUT) { > + gc->ops->set(gc, gpio, val); > + return 0; > + } > + > + return -ENOTSUPP; > +} > + > +static int mmio_74xx_gpio_probe(struct device_d *dev) > +{ > + struct mmio_74xx_gpio_priv *priv; > + void __iomem *dat; > + int err; > + struct gpio_chip *gc; > + > + priv = xzalloc(sizeof(*priv)); > + > + priv->flags = (uintptr_t)of_device_get_match_data(dev); > + > + dat = dev_request_mem_region(dev, 0); > + if (IS_ERR(dat)) > + return PTR_ERR(dat); > + > + err = bgpio_init(&priv->bgc, dev, > + DIV_ROUND_UP(MMIO_74XX_BIT_CNT(priv->flags), 8), > + dat, NULL, NULL, NULL, NULL, 0); > + if (err) > + return err; > + > + gc = &priv->bgc.gc; > + gc->ops->direction_input = mmio_74xx_dir_in; > + gc->ops->direction_output = mmio_74xx_dir_out; > + gc->ops->get_direction = mmio_74xx_get_direction; > + gc->ngpio = MMIO_74XX_BIT_CNT(priv->flags); > + > + dev->priv = priv; > + > + return gpiochip_add(gc); > +} > + > +static struct driver_d mmio_74xx_gpio_driver = { > + .name = "74xx-mmio-gpio", > + .of_compatible = DRV_OF_COMPAT(mmio_74xx_gpio_ids), > + .probe = mmio_74xx_gpio_probe, > +}; > + > +coredevice_platform_driver(mmio_74xx_gpio_driver); > + > +MODULE_LICENSE("GPL"); > +MODULE_AUTHOR("Alexander Shiyan <[email protected]>"); > +MODULE_DESCRIPTION("74xx MMIO GPIO driver"); > -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list [email protected] http://lists.infradead.org/mailman/listinfo/barebox
