diff options
Diffstat (limited to 'sys/arm/xilinx/zy7_gpio.c')
| -rw-r--r-- | sys/arm/xilinx/zy7_gpio.c | 384 |
1 files changed, 384 insertions, 0 deletions
diff --git a/sys/arm/xilinx/zy7_gpio.c b/sys/arm/xilinx/zy7_gpio.c new file mode 100644 index 0000000..5b6bb27 --- /dev/null +++ b/sys/arm/xilinx/zy7_gpio.c @@ -0,0 +1,384 @@ +/*- + * Copyright (C) 2013, Thomas Skibo. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * * The names of contributors may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL AUTHORS OR CONTRIBUTORS BE LIABLE FOR + * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER + * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH + * DAMAGE. + * + */ + +/* A GPIO driver for Xilinx Zynq-7000. + * + * The GPIO peripheral on Zynq allows controlling 114 general purpose I/Os. + * + * Pins 53-0 are sent to the MIO. Any MIO pins not used by a PS peripheral are + * available as a GPIO pin. Pins 64-127 are sent to the PL (FPGA) section of + * Zynq as EMIO signals. + * + * The hardware provides a way to use IOs as interrupt sources but the + * gpio framework doesn't seem to have hooks for this. + * + * Reference: Zynq-7000 All Programmable SoC Technical Reference Manual. + * (v1.4) November 16, 2012. Xilinx doc UG585. GPIO is covered in + * chater 14. Register definitions are in appendix B.19. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/conf.h> +#include <sys/bus.h> +#include <sys/kernel.h> +#include <sys/module.h> +#include <sys/lock.h> +#include <sys/mutex.h> +#include <sys/resource.h> +#include <sys/rman.h> +#include <sys/gpio.h> + +#include <machine/bus.h> +#include <machine/resource.h> +#include <machine/stdarg.h> + +#include <dev/fdt/fdt_common.h> +#include <dev/ofw/ofw_bus.h> +#include <dev/ofw/ofw_bus_subr.h> + +#include "gpio_if.h" + +#define NUMBANKS 4 +#define MAXPIN (32*NUMBANKS) + +#define MIO_PIN 0 /* pins 0-53 go to MIO */ +#define NUM_MIO_PINS 54 +#define EMIO_PIN 64 /* pins 64-127 go to PL */ +#define NUM_EMIO_PINS 64 + +#define VALID_PIN(u) (((u) >= MIO_PIN && (u) < MIO_PIN + NUM_MIO_PINS) || \ + ((u) >= EMIO_PIN && (u) < EMIO_PIN + NUM_EMIO_PINS)) + +#define ZGPIO_LOCK(sc) mtx_lock(&(sc)->sc_mtx) +#define ZGPIO_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx) +#define ZGPIO_LOCK_INIT(sc) \ + mtx_init(&(sc)->sc_mtx, device_get_nameunit((sc)->dev), \ + "gpio", MTX_DEF) +#define ZGPIO_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx); + +struct zy7_gpio_softc { + device_t dev; + struct mtx sc_mtx; + struct resource *mem_res; /* Memory resource */ +}; + +#define WR4(sc, off, val) bus_write_4((sc)->mem_res, (off), (val)) +#define RD4(sc, off) bus_read_4((sc)->mem_res, (off)) + + +/* Xilinx Zynq-7000 GPIO register definitions: + */ +#define ZY7_GPIO_MASK_DATA_LSW(b) (0x0000+8*(b)) /* maskable wr lo */ +#define ZY7_GPIO_MASK_DATA_MSW(b) (0x0004+8*(b)) /* maskable wr hi */ +#define ZY7_GPIO_DATA(b) (0x0040+4*(b)) /* in/out data */ +#define ZY7_GPIO_DATA_RO(b) (0x0060+4*(b)) /* input data */ + +#define ZY7_GPIO_DIRM(b) (0x0204+0x40*(b)) /* direction mode */ +#define ZY7_GPIO_OEN(b) (0x0208+0x40*(b)) /* output enable */ +#define ZY7_GPIO_INT_MASK(b) (0x020c+0x40*(b)) /* int mask */ +#define ZY7_GPIO_INT_EN(b) (0x0210+0x40*(b)) /* int enable */ +#define ZY7_GPIO_INT_DIS(b) (0x0214+0x40*(b)) /* int disable */ +#define ZY7_GPIO_INT_STAT(b) (0x0218+0x40*(b)) /* int status */ +#define ZY7_GPIO_INT_TYPE(b) (0x021c+0x40*(b)) /* int type */ +#define ZY7_GPIO_INT_POLARITY(b) (0x0220+0x40*(b)) /* int polarity */ +#define ZY7_GPIO_INT_ANY(b) (0x0224+0x40*(b)) /* any edge */ + + +static int +zy7_gpio_pin_max(device_t dev, int *maxpin) +{ + + *maxpin = MAXPIN; + return (0); +} + +/* Get a specific pin's capabilities. */ +static int +zy7_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps) +{ + + if (!VALID_PIN(pin)) + return (EINVAL); + + *caps = (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT | GPIO_PIN_TRISTATE); + + return (0); +} + +/* Get a specific pin's name. */ +static int +zy7_gpio_pin_getname(device_t dev, uint32_t pin, char *name) +{ + + if (!VALID_PIN(pin)) + return (EINVAL); + + if (pin < NUM_MIO_PINS) { + snprintf(name, GPIOMAXNAME, "MIO_%d", pin); + name[GPIOMAXNAME - 1] = '\0'; + } else { + snprintf(name, GPIOMAXNAME, "EMIO_%d", pin - EMIO_PIN); + name[GPIOMAXNAME - 1] = '\0'; + } + + return (0); +} + +/* Get a specific pin's current in/out/tri state. */ +static int +zy7_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags) +{ + struct zy7_gpio_softc *sc = device_get_softc(dev); + + if (!VALID_PIN(pin)) + return (EINVAL); + + ZGPIO_LOCK(sc); + + if ((RD4(sc, ZY7_GPIO_DIRM(pin >> 5)) & (1 << (pin & 31))) != 0) { + /* output */ + if ((RD4(sc, ZY7_GPIO_OEN(pin >> 5)) & (1 << (pin & 31))) == 0) + *flags = (GPIO_PIN_OUTPUT | GPIO_PIN_TRISTATE); + else + *flags = GPIO_PIN_OUTPUT; + } else + /* input */ + *flags = GPIO_PIN_INPUT; + + ZGPIO_UNLOCK(sc); + + return (0); +} + +/* Set a specific pin's in/out/tri state. */ +static int +zy7_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags) +{ + struct zy7_gpio_softc *sc = device_get_softc(dev); + + if (!VALID_PIN(pin)) + return (EINVAL); + + ZGPIO_LOCK(sc); + + if ((flags & GPIO_PIN_OUTPUT) != 0) { + /* Output. Set or reset OEN too. */ + WR4(sc, ZY7_GPIO_DIRM(pin >> 5), + RD4(sc, ZY7_GPIO_DIRM(pin >> 5)) | (1 << (pin & 31))); + + if ((flags & GPIO_PIN_TRISTATE) != 0) + WR4(sc, ZY7_GPIO_OEN(pin >> 5), + RD4(sc, ZY7_GPIO_OEN(pin >> 5)) & + ~(1 << (pin & 31))); + else + WR4(sc, ZY7_GPIO_OEN(pin >> 5), + RD4(sc, ZY7_GPIO_OEN(pin >> 5)) | + (1 << (pin & 31))); + } else { + /* Input. Turn off OEN. */ + WR4(sc, ZY7_GPIO_DIRM(pin >> 5), + RD4(sc, ZY7_GPIO_DIRM(pin >> 5)) & ~(1 << (pin & 31))); + WR4(sc, ZY7_GPIO_OEN(pin >> 5), + RD4(sc, ZY7_GPIO_OEN(pin >> 5)) & ~(1 << (pin & 31))); + } + + ZGPIO_UNLOCK(sc); + + return (0); +} + +/* Set a specific output pin's value. */ +static int +zy7_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value) +{ + struct zy7_gpio_softc *sc = device_get_softc(dev); + + if (!VALID_PIN(pin) || value > 1) + return (EINVAL); + + /* Fancy register tricks allow atomic set or reset. */ + if ((pin & 16) != 0) + WR4(sc, ZY7_GPIO_MASK_DATA_MSW(pin >> 5), + (0xffff0000 ^ (0x10000 << (pin & 15))) | + (value << (pin & 15))); + else + WR4(sc, ZY7_GPIO_MASK_DATA_LSW(pin >> 5), + (0xffff0000 ^ (0x10000 << (pin & 15))) | + (value << (pin & 15))); + + return (0); +} + +/* Get a specific pin's input value. */ +static int +zy7_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *value) +{ + struct zy7_gpio_softc *sc = device_get_softc(dev); + + if (!VALID_PIN(pin)) + return (EINVAL); + + *value = (RD4(sc, ZY7_GPIO_DATA_RO(pin >> 5)) >> (pin & 31)) & 1; + + return (0); +} + +/* Toggle a pin's output value. */ +static int +zy7_gpio_pin_toggle(device_t dev, uint32_t pin) +{ + struct zy7_gpio_softc *sc = device_get_softc(dev); + + if (!VALID_PIN(pin)) + return (EINVAL); + + ZGPIO_LOCK(sc); + + WR4(sc, ZY7_GPIO_DATA(pin >> 5), + RD4(sc, ZY7_GPIO_DATA(pin >> 5)) ^ (1 << (pin & 31))); + + ZGPIO_UNLOCK(sc); + + return (0); +} + +static int +zy7_gpio_probe(device_t dev) +{ + + if (!ofw_bus_is_compatible(dev, "xlnx,zy7_gpio")) + return (ENXIO); + + device_set_desc(dev, "Zynq-7000 GPIO driver"); + return (0); +} + +static void +zy7_gpio_hw_reset(struct zy7_gpio_softc *sc) +{ + int i; + + for (i = 0; i < NUMBANKS; i++) { + WR4(sc, ZY7_GPIO_DATA(i), 0); + WR4(sc, ZY7_GPIO_DIRM(i), 0); + WR4(sc, ZY7_GPIO_OEN(i), 0); + WR4(sc, ZY7_GPIO_INT_DIS(i), 0xffffffff); + WR4(sc, ZY7_GPIO_INT_POLARITY(i), 0); + WR4(sc, ZY7_GPIO_INT_TYPE(i), + i == 1 ? 0x003fffff : 0xffffffff); + WR4(sc, ZY7_GPIO_INT_ANY(i), 0); + WR4(sc, ZY7_GPIO_INT_STAT(i), 0xffffffff); + } +} + +static int zy7_gpio_detach(device_t dev); + +static int +zy7_gpio_attach(device_t dev) +{ + struct zy7_gpio_softc *sc = device_get_softc(dev); + int rid; + + sc->dev = dev; + + ZGPIO_LOCK_INIT(sc); + + /* Allocate memory. */ + rid = 0; + sc->mem_res = bus_alloc_resource_any(dev, + SYS_RES_MEMORY, &rid, RF_ACTIVE); + if (sc->mem_res == NULL) { + device_printf(dev, "Can't allocate memory for device"); + zy7_gpio_detach(dev); + return (ENOMEM); + } + + /* Completely reset. */ + zy7_gpio_hw_reset(sc); + + device_add_child(dev, "gpioc", device_get_unit(dev)); + device_add_child(dev, "gpiobus", device_get_unit(dev)); + + return (bus_generic_attach(dev)); +} + +static int +zy7_gpio_detach(device_t dev) +{ + struct zy7_gpio_softc *sc = device_get_softc(dev); + + bus_generic_detach(dev); + + if (sc->mem_res != NULL) { + /* Release memory resource. */ + bus_release_resource(dev, SYS_RES_MEMORY, + rman_get_rid(sc->mem_res), sc->mem_res); + } + + ZGPIO_LOCK_DESTROY(sc); + + return (0); +} + +static device_method_t zy7_gpio_methods[] = { + /* device_if */ + DEVMETHOD(device_probe, zy7_gpio_probe), + DEVMETHOD(device_attach, zy7_gpio_attach), + DEVMETHOD(device_detach, zy7_gpio_detach), + + /* GPIO protocol */ + DEVMETHOD(gpio_pin_max, zy7_gpio_pin_max), + DEVMETHOD(gpio_pin_getname, zy7_gpio_pin_getname), + DEVMETHOD(gpio_pin_getflags, zy7_gpio_pin_getflags), + DEVMETHOD(gpio_pin_getcaps, zy7_gpio_pin_getcaps), + DEVMETHOD(gpio_pin_setflags, zy7_gpio_pin_setflags), + DEVMETHOD(gpio_pin_get, zy7_gpio_pin_get), + DEVMETHOD(gpio_pin_set, zy7_gpio_pin_set), + DEVMETHOD(gpio_pin_toggle, zy7_gpio_pin_toggle), + + DEVMETHOD_END +}; + +static driver_t zy7_gpio_driver = { + "zy7_gpio", + zy7_gpio_methods, + sizeof(struct zy7_gpio_softc), +}; +static devclass_t zy7_gpio_devclass; + +extern devclass_t gpiobus_devclass, gpioc_devclass; +extern driver_t gpiobus_driver, gpioc_driver; + +DRIVER_MODULE(zy7_gpio, simplebus, zy7_gpio_driver, zy7_gpio_devclass, \ + NULL, NULL); +DRIVER_MODULE(gpiobus, zy7_gpio, gpiobus_driver, gpiobus_devclass, 0, 0); +DRIVER_MODULE(gpioc, zy7_gpio, gpioc_driver, gpioc_devclass, 0, 0); |
