FreeBSD/Linux Kernel Cross Reference
sys/arm/allwinner/aw_gpio.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2013 Ganbold Tsagaankhuu <ganbold@freebsd.org>
      * Copyright (c) 2012 Oleksandr Tymoshenko <gonzo@freebsd.org>
      * Copyright (c) 2012 Luiz Otavio O Souza.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 THE AUTHOR 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.
     *
     */
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/rman.h>
    #include <sys/lock.h>
    #include <sys/mutex.h>
    #include <sys/gpio.h>
    #include <sys/proc.h>
    
    #include <machine/bus.h>
    #include <machine/resource.h>
    #include <machine/intr.h>
    
    #include <dev/gpio/gpiobusvar.h>
    #include <dev/ofw/ofw_bus.h>
    #include <dev/ofw/ofw_bus_subr.h>
    #include <dev/fdt/fdt_pinctrl.h>
    
    #include <arm/allwinner/aw_machdep.h>
    #include <arm/allwinner/allwinner_pinctrl.h>
    #include <dev/extres/clk/clk.h>
    #include <dev/extres/hwreset/hwreset.h>
    #include <dev/extres/regulator/regulator.h>
    
    #if defined(__aarch64__)
    #include "opt_soc.h"
    #endif
    
    #include "pic_if.h"
    #include "gpio_if.h"
    
    #define AW_GPIO_DEFAULT_CAPS    (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT |     \
              GPIO_PIN_PULLUP | GPIO_PIN_PULLDOWN);
    
    #define AW_GPIO_INTR_CAPS       (GPIO_INTR_LEVEL_LOW | GPIO_INTR_LEVEL_HIGH |   \
              GPIO_INTR_EDGE_RISING | GPIO_INTR_EDGE_FALLING | GPIO_INTR_EDGE_BOTH)
    
    #define AW_GPIO_NONE            0
    #define AW_GPIO_PULLUP          1
    #define AW_GPIO_PULLDOWN        2
    
    #define AW_GPIO_INPUT           0
    #define AW_GPIO_OUTPUT          1
    
    #define AW_GPIO_DRV_MASK        0x3
    #define AW_GPIO_PUD_MASK        0x3
    
    #define AW_PINCTRL      1
    #define AW_R_PINCTRL    2
    
    struct aw_gpio_conf {
            struct allwinner_padconf *padconf;
            const char *banks;
    };
    
    /* Defined in aw_padconf.c */
    #ifdef SOC_ALLWINNER_A10
    extern struct allwinner_padconf a10_padconf;
    struct aw_gpio_conf a10_gpio_conf = {
            .padconf = &a10_padconf,
            .banks = "abcdefghi",
    };
    #endif
   
   /* Defined in a13_padconf.c */
   #ifdef SOC_ALLWINNER_A13
   extern struct allwinner_padconf a13_padconf;
   struct aw_gpio_conf a13_gpio_conf = {
           .padconf = &a13_padconf,
           .banks = "bcdefg",
   };
   #endif
   
   /* Defined in a20_padconf.c */
   #ifdef SOC_ALLWINNER_A20
   extern struct allwinner_padconf a20_padconf;
   struct aw_gpio_conf a20_gpio_conf = {
           .padconf = &a20_padconf,
           .banks = "abcdefghi",
   };
   #endif
   
   /* Defined in a31_padconf.c */
   #ifdef SOC_ALLWINNER_A31
   extern struct allwinner_padconf a31_padconf;
   struct aw_gpio_conf a31_gpio_conf = {
           .padconf = &a31_padconf,
           .banks = "abcdefgh",
   };
   #endif
   
   /* Defined in a31s_padconf.c */
   #ifdef SOC_ALLWINNER_A31S
   extern struct allwinner_padconf a31s_padconf;
   struct aw_gpio_conf a31s_gpio_conf = {
           .padconf = &a31s_padconf,
           .banks = "abcdefgh",
   };
   #endif
   
   #if defined(SOC_ALLWINNER_A31) || defined(SOC_ALLWINNER_A31S)
   extern struct allwinner_padconf a31_r_padconf;
   struct aw_gpio_conf a31_r_gpio_conf = {
           .padconf = &a31_r_padconf,
           .banks = "lm",
   };
   #endif
   
   /* Defined in a33_padconf.c */
   #ifdef SOC_ALLWINNER_A33
   extern struct allwinner_padconf a33_padconf;
   struct aw_gpio_conf a33_gpio_conf = {
           .padconf = &a33_padconf,
           .banks = "bcdefgh",
   };
   #endif
   
   /* Defined in h3_padconf.c */
   #if defined(SOC_ALLWINNER_H3) || defined(SOC_ALLWINNER_H5)
   extern struct allwinner_padconf h3_padconf;
   extern struct allwinner_padconf h3_r_padconf;
   struct aw_gpio_conf h3_gpio_conf = {
           .padconf = &h3_padconf,
           .banks = "acdefg",
   };
   struct aw_gpio_conf h3_r_gpio_conf = {
           .padconf = &h3_r_padconf,
           .banks = "l",
   };
   #endif
   
   /* Defined in a83t_padconf.c */
   #ifdef SOC_ALLWINNER_A83T
   extern struct allwinner_padconf a83t_padconf;
   extern struct allwinner_padconf a83t_r_padconf;
   struct aw_gpio_conf a83t_gpio_conf = {
           .padconf = &a83t_padconf,
           .banks = "bcdefgh"
   };
   struct aw_gpio_conf a83t_r_gpio_conf = {
           .padconf = &a83t_r_padconf,
           .banks = "l",
   };
   #endif
   
   /* Defined in a64_padconf.c */
   #ifdef SOC_ALLWINNER_A64
   extern struct allwinner_padconf a64_padconf;
   extern struct allwinner_padconf a64_r_padconf;
   struct aw_gpio_conf a64_gpio_conf = {
           .padconf = &a64_padconf,
           .banks = "bcdefgh",
   };
   struct aw_gpio_conf a64_r_gpio_conf = {
           .padconf = &a64_r_padconf,
           .banks = "l",
   };
   #endif
   
   /* Defined in h6_padconf.c */
   #ifdef SOC_ALLWINNER_H6
   extern struct allwinner_padconf h6_padconf;
   extern struct allwinner_padconf h6_r_padconf;
   struct aw_gpio_conf h6_gpio_conf = {
           .padconf = &h6_padconf,
           .banks = "cdfgh",
   };
   struct aw_gpio_conf h6_r_gpio_conf = {
           .padconf = &h6_r_padconf,
           .banks = "lm",
   };
   #endif
   
   static struct ofw_compat_data compat_data[] = {
   #ifdef SOC_ALLWINNER_A10
           {"allwinner,sun4i-a10-pinctrl",         (uintptr_t)&a10_gpio_conf},
   #endif
   #ifdef SOC_ALLWINNER_A13
           {"allwinner,sun5i-a13-pinctrl",         (uintptr_t)&a13_gpio_conf},
   #endif
   #ifdef SOC_ALLWINNER_A20
           {"allwinner,sun7i-a20-pinctrl",         (uintptr_t)&a20_gpio_conf},
   #endif
   #ifdef SOC_ALLWINNER_A31
           {"allwinner,sun6i-a31-pinctrl",         (uintptr_t)&a31_gpio_conf},
   #endif
   #ifdef SOC_ALLWINNER_A31S
           {"allwinner,sun6i-a31s-pinctrl",        (uintptr_t)&a31s_gpio_conf},
   #endif
   #if defined(SOC_ALLWINNER_A31) || defined(SOC_ALLWINNER_A31S)
           {"allwinner,sun6i-a31-r-pinctrl",       (uintptr_t)&a31_r_gpio_conf},
   #endif
   #ifdef SOC_ALLWINNER_A33
           {"allwinner,sun6i-a33-pinctrl",         (uintptr_t)&a33_gpio_conf},
   #endif
   #ifdef SOC_ALLWINNER_A83T
           {"allwinner,sun8i-a83t-pinctrl",        (uintptr_t)&a83t_gpio_conf},
           {"allwinner,sun8i-a83t-r-pinctrl",      (uintptr_t)&a83t_r_gpio_conf},
   #endif
   #if defined(SOC_ALLWINNER_H3) || defined(SOC_ALLWINNER_H5)
           {"allwinner,sun8i-h3-pinctrl",          (uintptr_t)&h3_gpio_conf},
           {"allwinner,sun50i-h5-pinctrl",         (uintptr_t)&h3_gpio_conf},
           {"allwinner,sun8i-h3-r-pinctrl",        (uintptr_t)&h3_r_gpio_conf},
   #endif
   #ifdef SOC_ALLWINNER_A64
           {"allwinner,sun50i-a64-pinctrl",        (uintptr_t)&a64_gpio_conf},
           {"allwinner,sun50i-a64-r-pinctrl",      (uintptr_t)&a64_r_gpio_conf},
   #endif
   #ifdef SOC_ALLWINNER_H6
           {"allwinner,sun50i-h6-pinctrl", (uintptr_t)&h6_gpio_conf},
           {"allwinner,sun50i-h6-r-pinctrl",       (uintptr_t)&h6_r_gpio_conf},
   #endif
           {NULL,  0}
   };
   
   struct clk_list {
           TAILQ_ENTRY(clk_list)   next;
           clk_t                   clk;
   };
   
   struct gpio_irqsrc {
           struct intr_irqsrc      isrc;
           u_int                   irq;
           uint32_t                mode;
           uint32_t                pin;
           uint32_t                bank;
           uint32_t                intnum;
           uint32_t                intfunc;
           uint32_t                oldfunc;
           bool                    enabled;
   };
   
   #define AW_GPIO_MEMRES          0
   #define AW_GPIO_IRQRES          1
   #define AW_GPIO_RESSZ           2
   
   struct aw_gpio_softc {
           device_t                sc_dev;
           device_t                sc_busdev;
           struct resource *       sc_res[AW_GPIO_RESSZ];
           struct mtx              sc_mtx;
           struct resource *       sc_mem_res;
           struct resource *       sc_irq_res;
           void *                  sc_intrhand;
           struct aw_gpio_conf     *conf;
           TAILQ_HEAD(, clk_list)          clk_list;
   
           struct gpio_irqsrc      *gpio_pic_irqsrc;
           int                     nirqs;
   };
   
   static struct resource_spec aw_gpio_res_spec[] = {
           { SYS_RES_MEMORY,       0,      RF_ACTIVE },
           { SYS_RES_IRQ,          0,      RF_ACTIVE | RF_SHAREABLE },
           { -1,                   0,      0 }
   };
   
   #define AW_GPIO_LOCK(_sc)               mtx_lock_spin(&(_sc)->sc_mtx)
   #define AW_GPIO_UNLOCK(_sc)             mtx_unlock_spin(&(_sc)->sc_mtx)
   #define AW_GPIO_LOCK_ASSERT(_sc)        mtx_assert(&(_sc)->sc_mtx, MA_OWNED)
   
   #define AW_GPIO_GP_CFG(_bank, _idx)     0x00 + ((_bank) * 0x24) + ((_idx) << 2)
   #define AW_GPIO_GP_DAT(_bank)           0x10 + ((_bank) * 0x24)
   #define AW_GPIO_GP_DRV(_bank, _idx)     0x14 + ((_bank) * 0x24) + ((_idx) << 2)
   #define AW_GPIO_GP_PUL(_bank, _idx)     0x1c + ((_bank) * 0x24) + ((_idx) << 2)
   
   #define AW_GPIO_GP_INT_BASE(_bank)      (0x200 + 0x20 * _bank)
   
   #define AW_GPIO_GP_INT_CFG(_bank, _pin) (AW_GPIO_GP_INT_BASE(_bank) + (0x4 * ((_pin) / 8)))
   #define AW_GPIO_GP_INT_CTL(_bank)       (AW_GPIO_GP_INT_BASE(_bank) + 0x10)
   #define AW_GPIO_GP_INT_STA(_bank)       (AW_GPIO_GP_INT_BASE(_bank) + 0x14)
   #define AW_GPIO_GP_INT_DEB(_bank)       (AW_GPIO_GP_INT_BASE(_bank) + 0x18)
   
   #define AW_GPIO_INT_EDGE_POSITIVE       0x0
   #define AW_GPIO_INT_EDGE_NEGATIVE       0x1
   #define AW_GPIO_INT_LEVEL_HIGH          0x2
   #define AW_GPIO_INT_LEVEL_LOW           0x3
   #define AW_GPIO_INT_EDGE_BOTH           0x4
   
   static char *aw_gpio_parse_function(phandle_t node);
   static const char **aw_gpio_parse_pins(phandle_t node, int *pins_nb);
   static uint32_t aw_gpio_parse_bias(phandle_t node);
   static int aw_gpio_parse_drive_strength(phandle_t node, uint32_t *drive);
   
   static int aw_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *value);
   static int aw_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value);
   static int aw_gpio_pin_get_locked(struct aw_gpio_softc *sc, uint32_t pin, unsigned int *value);
   static int aw_gpio_pin_set_locked(struct aw_gpio_softc *sc, uint32_t pin, unsigned int value);
   
   static void aw_gpio_intr(void *arg);
   static void aw_gpio_pic_disable_intr(device_t dev, struct intr_irqsrc *isrc);
   static void aw_gpio_pic_disable_intr_locked(struct aw_gpio_softc *sc, struct intr_irqsrc *isrc);
   static void aw_gpio_pic_post_filter(device_t dev, struct intr_irqsrc *isrc);
   static int aw_gpio_register_isrcs(struct aw_gpio_softc *sc);
   
   #define AW_GPIO_WRITE(_sc, _off, _val)          \
           bus_write_4((_sc)->sc_res[AW_GPIO_MEMRES], _off, _val)
   #define AW_GPIO_READ(_sc, _off)         \
           bus_read_4((_sc)->sc_res[AW_GPIO_MEMRES], _off)
   
   static uint32_t
   aw_gpio_get_function(struct aw_gpio_softc *sc, uint32_t pin)
   {
           uint32_t bank, func, offset;
   
           /* Must be called with lock held. */
           AW_GPIO_LOCK_ASSERT(sc);
   
           if (pin > sc->conf->padconf->npins)
                   return (0);
           bank = sc->conf->padconf->pins[pin].port;
           pin = sc->conf->padconf->pins[pin].pin;
           offset = ((pin & 0x07) << 2);
   
           func = AW_GPIO_READ(sc, AW_GPIO_GP_CFG(bank, pin >> 3));
   
           return ((func >> offset) & 0x7);
   }
   
   static int
   aw_gpio_set_function(struct aw_gpio_softc *sc, uint32_t pin, uint32_t f)
   {
           uint32_t bank, data, offset;
   
           /* Check if the function exists in the padconf data */
           if (sc->conf->padconf->pins[pin].functions[f] == NULL)
                   return (EINVAL);
   
           /* Must be called with lock held. */
           AW_GPIO_LOCK_ASSERT(sc);
   
           bank = sc->conf->padconf->pins[pin].port;
           pin = sc->conf->padconf->pins[pin].pin;
           offset = ((pin & 0x07) << 2);
   
           data = AW_GPIO_READ(sc, AW_GPIO_GP_CFG(bank, pin >> 3));
           data &= ~(7 << offset);
           data |= (f << offset);
           AW_GPIO_WRITE(sc, AW_GPIO_GP_CFG(bank, pin >> 3), data);
   
           return (0);
   }
   
   static uint32_t
   aw_gpio_get_pud(struct aw_gpio_softc *sc, uint32_t pin)
   {
           uint32_t bank, offset, val;
   
           /* Must be called with lock held. */
           AW_GPIO_LOCK_ASSERT(sc);
   
           bank = sc->conf->padconf->pins[pin].port;
           pin = sc->conf->padconf->pins[pin].pin;
           offset = ((pin & 0x0f) << 1);
   
           val = AW_GPIO_READ(sc, AW_GPIO_GP_PUL(bank, pin >> 4));
   
           return ((val >> offset) & AW_GPIO_PUD_MASK);
   }
   
   static void
   aw_gpio_set_pud(struct aw_gpio_softc *sc, uint32_t pin, uint32_t state)
   {
           uint32_t bank, offset, val;
   
           if (aw_gpio_get_pud(sc, pin) == state)
                   return;
   
           /* Must be called with lock held. */
           AW_GPIO_LOCK_ASSERT(sc);
   
           bank = sc->conf->padconf->pins[pin].port;
           pin = sc->conf->padconf->pins[pin].pin;
           offset = ((pin & 0x0f) << 1);
   
           val = AW_GPIO_READ(sc, AW_GPIO_GP_PUL(bank, pin >> 4));
           val &= ~(AW_GPIO_PUD_MASK << offset);
           val |= (state << offset);
           AW_GPIO_WRITE(sc, AW_GPIO_GP_PUL(bank, pin >> 4), val);
   }
   
   static uint32_t
   aw_gpio_get_drv(struct aw_gpio_softc *sc, uint32_t pin)
   {
           uint32_t bank, offset, val;
   
           /* Must be called with lock held. */
           AW_GPIO_LOCK_ASSERT(sc);
   
           bank = sc->conf->padconf->pins[pin].port;
           pin = sc->conf->padconf->pins[pin].pin;
           offset = ((pin & 0x0f) << 1);
   
           val = AW_GPIO_READ(sc, AW_GPIO_GP_DRV(bank, pin >> 4));
   
           return ((val >> offset) & AW_GPIO_DRV_MASK);
   }
   
   static void
   aw_gpio_set_drv(struct aw_gpio_softc *sc, uint32_t pin, uint32_t drive)
   {
           uint32_t bank, offset, val;
   
           if (aw_gpio_get_drv(sc, pin) == drive)
                   return;
   
           /* Must be called with lock held. */
           AW_GPIO_LOCK_ASSERT(sc);
   
           bank = sc->conf->padconf->pins[pin].port;
           pin = sc->conf->padconf->pins[pin].pin;
           offset = ((pin & 0x0f) << 1);
   
           val = AW_GPIO_READ(sc, AW_GPIO_GP_DRV(bank, pin >> 4));
           val &= ~(AW_GPIO_DRV_MASK << offset);
           val |= (drive << offset);
           AW_GPIO_WRITE(sc, AW_GPIO_GP_DRV(bank, pin >> 4), val);
   }
   
   static int
   aw_gpio_pin_configure(struct aw_gpio_softc *sc, uint32_t pin, uint32_t flags)
   {
           u_int val;
           int err = 0;
   
           /* Must be called with lock held. */
           AW_GPIO_LOCK_ASSERT(sc);
   
           if (pin > sc->conf->padconf->npins)
                   return (EINVAL);
   
           /* Manage input/output. */
           if (flags & GPIO_PIN_INPUT) {
                   err = aw_gpio_set_function(sc, pin, AW_GPIO_INPUT);
           } else if ((flags & GPIO_PIN_OUTPUT) &&
               aw_gpio_get_function(sc, pin) != AW_GPIO_OUTPUT) {
                   if (flags & GPIO_PIN_PRESET_LOW) {
                           aw_gpio_pin_set_locked(sc, pin, 0);
                   } else if (flags & GPIO_PIN_PRESET_HIGH) {
                           aw_gpio_pin_set_locked(sc, pin, 1);
                   } else {
                           /* Read the pin and preset output to current state. */
                           err = aw_gpio_set_function(sc, pin, AW_GPIO_INPUT);
                           if (err == 0) {
                                   aw_gpio_pin_get_locked(sc, pin, &val);
                                   aw_gpio_pin_set_locked(sc, pin, val);
                           }
                   }
                   if (err == 0)
                           err = aw_gpio_set_function(sc, pin, AW_GPIO_OUTPUT);
           }
   
           if (err)
                   return (err);
   
           /* Manage Pull-up/pull-down. */
           if (flags & GPIO_PIN_PULLUP)
                   aw_gpio_set_pud(sc, pin, AW_GPIO_PULLUP);
           else if (flags & GPIO_PIN_PULLDOWN)
                   aw_gpio_set_pud(sc, pin, AW_GPIO_PULLDOWN);
           else
                   aw_gpio_set_pud(sc, pin, AW_GPIO_NONE);
   
           return (0);
   }
   
   static device_t
   aw_gpio_get_bus(device_t dev)
   {
           struct aw_gpio_softc *sc;
   
           sc = device_get_softc(dev);
   
           return (sc->sc_busdev);
   }
   
   static int
   aw_gpio_pin_max(device_t dev, int *maxpin)
   {
           struct aw_gpio_softc *sc;
   
           sc = device_get_softc(dev);
   
           *maxpin = sc->conf->padconf->npins - 1;
           return (0);
   }
   
   static int
   aw_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
   {
           struct aw_gpio_softc *sc;
   
           sc = device_get_softc(dev);
           if (pin >= sc->conf->padconf->npins)
                   return (EINVAL);
   
           *caps = AW_GPIO_DEFAULT_CAPS;
           if (sc->conf->padconf->pins[pin].eint_func != 0)
                   *caps |= AW_GPIO_INTR_CAPS;
   
           return (0);
   }
   
   static int
   aw_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
   {
           struct aw_gpio_softc *sc;
           uint32_t func;
           uint32_t pud;
   
           sc = device_get_softc(dev);
           if (pin >= sc->conf->padconf->npins)
                   return (EINVAL);
   
           AW_GPIO_LOCK(sc);
           func = aw_gpio_get_function(sc, pin);
           switch (func) {
           case AW_GPIO_INPUT:
                   *flags = GPIO_PIN_INPUT;
                   break;
           case AW_GPIO_OUTPUT:
                   *flags = GPIO_PIN_OUTPUT;
                   break;
           default:
                   *flags = 0;
                   break;
           }
   
           pud = aw_gpio_get_pud(sc, pin);
           switch (pud) {
           case AW_GPIO_PULLDOWN:
                   *flags |= GPIO_PIN_PULLDOWN;
                   break;
           case AW_GPIO_PULLUP:
                   *flags |= GPIO_PIN_PULLUP;
                   break;
           default:
                   break;
           }
   
           AW_GPIO_UNLOCK(sc);
   
           return (0);
   }
   
   static int
   aw_gpio_pin_getname(device_t dev, uint32_t pin, char *name)
   {
           struct aw_gpio_softc *sc;
   
           sc = device_get_softc(dev);
           if (pin >= sc->conf->padconf->npins)
                   return (EINVAL);
   
           snprintf(name, GPIOMAXNAME - 1, "%s",
               sc->conf->padconf->pins[pin].name);
           name[GPIOMAXNAME - 1] = '\0';
   
           return (0);
   }
   
   static int
   aw_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
   {
           struct aw_gpio_softc *sc;
           int err;
   
           sc = device_get_softc(dev);
           if (pin > sc->conf->padconf->npins)
                   return (EINVAL);
   
           AW_GPIO_LOCK(sc);
           err = aw_gpio_pin_configure(sc, pin, flags);
           AW_GPIO_UNLOCK(sc);
   
           return (err);
   }
   
   static int
   aw_gpio_pin_set_locked(struct aw_gpio_softc *sc, uint32_t pin,
       unsigned int value)
   {
           uint32_t bank, data;
   
           AW_GPIO_LOCK_ASSERT(sc);
   
           if (pin > sc->conf->padconf->npins)
                   return (EINVAL);
   
           bank = sc->conf->padconf->pins[pin].port;
           pin = sc->conf->padconf->pins[pin].pin;
   
           data = AW_GPIO_READ(sc, AW_GPIO_GP_DAT(bank));
           if (value)
                   data |= (1 << pin);
           else
                   data &= ~(1 << pin);
           AW_GPIO_WRITE(sc, AW_GPIO_GP_DAT(bank), data);
   
           return (0);
   }
   
   static int
   aw_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
   {
           struct aw_gpio_softc *sc;
           int ret;
   
           sc = device_get_softc(dev);
   
           AW_GPIO_LOCK(sc);
           ret = aw_gpio_pin_set_locked(sc, pin, value);
           AW_GPIO_UNLOCK(sc);
   
           return (ret);
   }
   
   static int
   aw_gpio_pin_get_locked(struct aw_gpio_softc *sc,uint32_t pin,
       unsigned int *val)
   {
           uint32_t bank, reg_data;
   
           AW_GPIO_LOCK_ASSERT(sc);
   
           if (pin > sc->conf->padconf->npins)
                   return (EINVAL);
   
           bank = sc->conf->padconf->pins[pin].port;
           pin = sc->conf->padconf->pins[pin].pin;
   
           reg_data = AW_GPIO_READ(sc, AW_GPIO_GP_DAT(bank));
           *val = (reg_data & (1 << pin)) ? 1 : 0;
   
           return (0);
   }
   
   static char *
   aw_gpio_parse_function(phandle_t node)
   {
           char *function;
   
           if (OF_getprop_alloc(node, "function",
               (void **)&function) != -1)
                   return (function);
           if (OF_getprop_alloc(node, "allwinner,function",
               (void **)&function) != -1)
                   return (function);
   
           return (NULL);
   }
   
   static const char **
   aw_gpio_parse_pins(phandle_t node, int *pins_nb)
   {
           const char **pinlist;
   
           *pins_nb = ofw_bus_string_list_to_array(node, "pins", &pinlist);
           if (*pins_nb > 0)
                   return (pinlist);
   
           *pins_nb = ofw_bus_string_list_to_array(node, "allwinner,pins",
               &pinlist);
           if (*pins_nb > 0)
                   return (pinlist);
   
           return (NULL);
   }
   
   static uint32_t
   aw_gpio_parse_bias(phandle_t node)
   {
           uint32_t bias;
   
           if (OF_getencprop(node, "pull", &bias, sizeof(bias)) != -1)
                   return (bias);
           if (OF_getencprop(node, "allwinner,pull", &bias, sizeof(bias)) != -1)
                   return (bias);
           if (OF_hasprop(node, "bias-disable"))
                   return (AW_GPIO_NONE);
           if (OF_hasprop(node, "bias-pull-up"))
                   return (AW_GPIO_PULLUP);
           if (OF_hasprop(node, "bias-pull-down"))
                   return (AW_GPIO_PULLDOWN);
   
           return (AW_GPIO_NONE);
   }
   
   static int
   aw_gpio_parse_drive_strength(phandle_t node, uint32_t *drive)
   {
           uint32_t drive_str;
   
           if (OF_getencprop(node, "drive", drive, sizeof(*drive)) != -1)
                   return (0);
           if (OF_getencprop(node, "allwinner,drive", drive, sizeof(*drive)) != -1)
                   return (0);
           if (OF_getencprop(node, "drive-strength", &drive_str,
               sizeof(drive_str)) != -1) {
                   *drive = (drive_str / 10) - 1;
                   return (0);
           }
   
           return (1);
   }
   
   static int
   aw_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *val)
   {
           struct aw_gpio_softc *sc;
           int ret;
   
           sc = device_get_softc(dev);
   
           AW_GPIO_LOCK(sc);
           ret = aw_gpio_pin_get_locked(sc, pin, val);
           AW_GPIO_UNLOCK(sc);
   
           return (ret);
   }
   
   static int
   aw_gpio_pin_toggle(device_t dev, uint32_t pin)
   {
           struct aw_gpio_softc *sc;
           uint32_t bank, data;
   
           sc = device_get_softc(dev);
           if (pin > sc->conf->padconf->npins)
                   return (EINVAL);
   
           bank = sc->conf->padconf->pins[pin].port;
           pin = sc->conf->padconf->pins[pin].pin;
   
           AW_GPIO_LOCK(sc);
           data = AW_GPIO_READ(sc, AW_GPIO_GP_DAT(bank));
           if (data & (1 << pin))
                   data &= ~(1 << pin);
           else
                   data |= (1 << pin);
           AW_GPIO_WRITE(sc, AW_GPIO_GP_DAT(bank), data);
           AW_GPIO_UNLOCK(sc);
   
           return (0);
   }
   
   static int
   aw_gpio_pin_access_32(device_t dev, uint32_t first_pin, uint32_t clear_pins,
       uint32_t change_pins, uint32_t *orig_pins)
   {
           struct aw_gpio_softc *sc;
           uint32_t bank, data, pin;
   
           sc = device_get_softc(dev);
           if (first_pin > sc->conf->padconf->npins)
                   return (EINVAL);
   
           /*
            * We require that first_pin refers to the first pin in a bank, because
            * this API is not about convenience, it's for making a set of pins
            * change simultaneously (required) with reasonably high performance
            * (desired); we need to do a read-modify-write on a single register.
            */
           bank = sc->conf->padconf->pins[first_pin].port;
           pin = sc->conf->padconf->pins[first_pin].pin;
           if (pin != 0)
                   return (EINVAL);
   
           AW_GPIO_LOCK(sc);
           data = AW_GPIO_READ(sc, AW_GPIO_GP_DAT(bank));
           if ((clear_pins | change_pins) != 0) 
                   AW_GPIO_WRITE(sc, AW_GPIO_GP_DAT(bank),
                       (data & ~clear_pins) ^ change_pins);
           AW_GPIO_UNLOCK(sc);
   
           if (orig_pins != NULL)
                   *orig_pins = data;
   
           return (0);
   }
   
   static int
   aw_gpio_pin_config_32(device_t dev, uint32_t first_pin, uint32_t num_pins,
       uint32_t *pin_flags)
   {
           struct aw_gpio_softc *sc;
           uint32_t pin;
           int err;
   
           sc = device_get_softc(dev);
           if (first_pin > sc->conf->padconf->npins)
                   return (EINVAL);
   
           if (sc->conf->padconf->pins[first_pin].pin != 0)
                   return (EINVAL);
   
           /*
            * The configuration for a bank of pins is scattered among several
            * registers; we cannot g'tee to simultaneously change the state of all
            * the pins in the flags array.  So just loop through the array
            * configuring each pin for now.  If there was a strong need, it might
            * be possible to support some limited simultaneous config, such as
            * adjacent groups of 8 pins that line up the same as the config regs.
            */
           for (err = 0, pin = first_pin; err == 0 && pin < num_pins; ++pin) {
                   if (pin_flags[pin] & (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT))
                           err = aw_gpio_pin_configure(sc, pin, pin_flags[pin]);
           }
   
           return (err);
   }
   
   static int
   aw_gpio_map_gpios(device_t bus, phandle_t dev, phandle_t gparent, int gcells,
       pcell_t *gpios, uint32_t *pin, uint32_t *flags)
   {
           struct aw_gpio_softc *sc;
           int i;
   
           sc = device_get_softc(bus);
   
           /* The GPIO pins are mapped as: <gpio-phandle bank pin flags>. */
           for (i = 0; i < sc->conf->padconf->npins; i++)
                   if (sc->conf->padconf->pins[i].port == gpios[0] &&
                       sc->conf->padconf->pins[i].pin == gpios[1]) {
                           *pin = i;
                           break;
                   }
           *flags = gpios[gcells - 1];
   
           return (0);
   }
   
   static int
   aw_find_pinnum_by_name(struct aw_gpio_softc *sc, const char *pinname)
   {
           int i;
   
           for (i = 0; i < sc->conf->padconf->npins; i++)
                   if (!strcmp(pinname, sc->conf->padconf->pins[i].name))
                           return i;
   
           return (-1);
   }
   
   static int
   aw_find_pin_func(struct aw_gpio_softc *sc, int pin, const char *func)
   {
           int i;
   
           for (i = 0; i < AW_MAX_FUNC_BY_PIN; i++)
                   if (sc->conf->padconf->pins[pin].functions[i] &&
                       !strcmp(func, sc->conf->padconf->pins[pin].functions[i]))
                           return (i);
   
           return (-1);
   }
   
   static int
   aw_fdt_configure_pins(device_t dev, phandle_t cfgxref)
   {
           struct aw_gpio_softc *sc;
           phandle_t node;
           const char **pinlist = NULL;
           char *pin_function = NULL;
           uint32_t pin_drive, pin_pull;
           int pins_nb, pin_num, pin_func, i, ret;
           bool set_drive;
   
           sc = device_get_softc(dev);
           node = OF_node_from_xref(cfgxref);
           ret = 0;
           set_drive = false;
   
           /* Getting all prop for configuring pins */
           pinlist = aw_gpio_parse_pins(node, &pins_nb);
           if (pinlist == NULL)
                   return (ENOENT);
   
           pin_function = aw_gpio_parse_function(node);
           if (pin_function == NULL) {
                   ret = ENOENT;
                   goto out;
           }
   
           if (aw_gpio_parse_drive_strength(node, &pin_drive) == 0)
                   set_drive = true;
   
           pin_pull = aw_gpio_parse_bias(node);
   
           /* Configure each pin to the correct function, drive and pull */
           for (i = 0; i < pins_nb; i++) {
                   pin_num = aw_find_pinnum_by_name(sc, pinlist[i]);
                   if (pin_num == -1) {
                           ret = ENOENT;
                           goto out;
                   }
                   pin_func = aw_find_pin_func(sc, pin_num, pin_function);
                   if (pin_func == -1) {
                           ret = ENOENT;
                           goto out;
                   }
   
                   AW_GPIO_LOCK(sc);
   
                   if (aw_gpio_get_function(sc, pin_num) != pin_func)
                           aw_gpio_set_function(sc, pin_num, pin_func);
                   if (set_drive)
                           aw_gpio_set_drv(sc, pin_num, pin_drive);
                   if (pin_pull != AW_GPIO_NONE)
                           aw_gpio_set_pud(sc, pin_num, pin_pull);
   
                   AW_GPIO_UNLOCK(sc);
           }
   
    out:
           OF_prop_free(pinlist);
           OF_prop_free(pin_function);
           return (ret);
   }
   
   static void
   aw_gpio_enable_bank_supply(void *arg)
   {
           struct aw_gpio_softc *sc = arg;
           regulator_t vcc_supply;
           char bank_reg_name[16];
           int i, nbanks;
   
           nbanks = strlen(sc->conf->banks);
           for (i = 0; i < nbanks; i++) {
                   snprintf(bank_reg_name, sizeof(bank_reg_name), "vcc-p%c-supply",
                       sc->conf->banks[i]);
   
                   if (regulator_get_by_ofw_property(sc->sc_dev, 0, bank_reg_name, &vcc_supply) == 0) {
                           if (bootverbose)
                                   device_printf(sc->sc_dev,
                                       "Enabling regulator for gpio bank %c\n",
                                       sc->conf->banks[i]);
                           if (regulator_enable(vcc_supply) != 0) {
                                   device_printf(sc->sc_dev,
                                       "Cannot enable regulator for bank %c\n",
                                       sc->conf->banks[i]);
                           }
                   }
           }
   }
   
   static int
   aw_gpio_probe(device_t dev)
   {
   
           if (!ofw_bus_status_okay(dev))
                   return (ENXIO);
   
           if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
                   return (ENXIO);
   
           device_set_desc(dev, "Allwinner GPIO/Pinmux controller");
           return (BUS_PROBE_DEFAULT);
   }
   
   static int
  aw_gpio_attach(device_t dev)
  {
          int error;
          phandle_t gpio;
          struct aw_gpio_softc *sc;
          struct clk_list *clkp, *clkp_tmp;
          clk_t clk;
          hwreset_t rst = NULL;
          int off, err, clkret;
  
          sc = device_get_softc(dev);
          sc->sc_dev = dev;
  
          mtx_init(&sc->sc_mtx, "aw gpio", "gpio", MTX_SPIN);
  
          if (bus_alloc_resources(dev, aw_gpio_res_spec, sc->sc_res) != 0) {
                  device_printf(dev, "cannot allocate device resources\n");
                  return (ENXIO);
          }
  
          if (bus_setup_intr(dev, sc->sc_res[AW_GPIO_IRQRES],
              INTR_TYPE_CLK | INTR_MPSAFE, NULL, aw_gpio_intr, sc,
              &sc->sc_intrhand)) {
                  device_printf(dev, "cannot setup interrupt handler\n");
                  goto fail;
          }
  
          /* Find our node. */
          gpio = ofw_bus_get_node(sc->sc_dev);
          if (!OF_hasprop(gpio, "gpio-controller"))
                  /* Node is not a GPIO controller. */
                  goto fail;
  
          /* Use the right pin data for the current SoC */
          sc->conf = (struct aw_gpio_conf *)ofw_bus_search_compatible(dev,
              compat_data)->ocd_data;
  
          if (hwreset_get_by_ofw_idx(dev, 0, 0, &rst) == 0) {
                  error = hwreset_deassert(rst);
                  if (error != 0) {
                          device_printf(dev, "cannot de-assert reset\n");
                          goto fail;
                  }
          }
  
          TAILQ_INIT(&sc->clk_list);
          for (off = 0, clkret = 0; clkret == 0; off++) {
                  clkret = clk_get_by_ofw_index(dev, 0, off, &clk);
                  if (clkret != 0)
                          break;
                  err = clk_enable(clk);
                  if (err != 0) {
                          device_printf(dev, "Could not enable clock %s\n",
                              clk_get_name(clk));
                          goto fail;
                  }
                  clkp = malloc(sizeof(*clkp), M_DEVBUF, M_WAITOK | M_ZERO);
                  clkp->clk = clk;
                  TAILQ_INSERT_TAIL(&sc->clk_list, clkp, next);
          }
          if (clkret != 0 && clkret != ENOENT) {
                  device_printf(dev, "Could not find clock at offset %d (%d)\n",
                      off, clkret);
                  goto fail;
          }
  
          aw_gpio_register_isrcs(sc);
          intr_pic_register(dev, OF_xref_from_node(ofw_bus_get_node(dev)));
  
          sc->sc_busdev = gpiobus_attach_bus(dev);
          if (sc->sc_busdev == NULL)
                  goto fail;
  
          /*
           * Register as a pinctrl device
           */
          fdt_pinctrl_register(dev, "pins");
          fdt_pinctrl_configure_tree(dev);
          fdt_pinctrl_register(dev, "allwinner,pins");
          fdt_pinctrl_configure_tree(dev);
  
          config_intrhook_oneshot(aw_gpio_enable_bank_supply, sc);
  
          return (0);
  
  fail:
          if (sc->sc_irq_res)
                  bus_release_resource(dev, SYS_RES_IRQ, 0, sc->sc_irq_res);
          if (sc->sc_mem_res)
                  bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res);
          mtx_destroy(&sc->sc_mtx);
  
          /* Disable clock */
          TAILQ_FOREACH_SAFE(clkp, &sc->clk_list, next, clkp_tmp) {
                  err = clk_disable(clkp->clk);
                  if (err != 0)
                          device_printf(dev, "Could not disable clock %s\n",
                              clk_get_name(clkp->clk));
                  err = clk_release(clkp->clk);
                  if (err != 0)
                          device_printf(dev, "Could not release clock %s\n",
                              clk_get_name(clkp->clk));
                  TAILQ_REMOVE(&sc->clk_list, clkp, next);
                  free(clkp, M_DEVBUF);
          }
  
          /* Assert resets */
          if (rst) {
                  hwreset_assert(rst);
                  hwreset_release(rst);
          }
  
          return (ENXIO);
  }
  
  static int
  aw_gpio_detach(device_t dev)
  {
  
          return (EBUSY);
  }
  
  static void
  aw_gpio_intr(void *arg)
  {
          struct aw_gpio_softc *sc;
          struct intr_irqsrc *isrc;
          uint32_t reg;
          int irq;
  
          sc = (struct aw_gpio_softc *)arg;
  
          AW_GPIO_LOCK(sc);
          for (irq = 0; irq < sc->nirqs; irq++) {
                  if (!sc->gpio_pic_irqsrc[irq].enabled)
                          continue;
  
                  reg = AW_GPIO_READ(sc, AW_GPIO_GP_INT_STA(sc->gpio_pic_irqsrc[irq].bank));
                  if (!(reg & (1 << sc->gpio_pic_irqsrc[irq].intnum)))
                          continue;
  
                  isrc = &sc->gpio_pic_irqsrc[irq].isrc;
                  if (intr_isrc_dispatch(isrc, curthread->td_intr_frame) != 0) {
                          aw_gpio_pic_disable_intr_locked(sc, isrc);
                          aw_gpio_pic_post_filter(sc->sc_dev, isrc);
                          device_printf(sc->sc_dev, "Stray irq %u disabled\n", irq);
                  }
          }
          AW_GPIO_UNLOCK(sc);
  }
  
  /*
   * Interrupts support
   */
  
  static int
  aw_gpio_register_isrcs(struct aw_gpio_softc *sc)
  {
          const char *name;
          int nirqs;
          int pin;
          int err;
  
          name = device_get_nameunit(sc->sc_dev);
  
          for (nirqs = 0, pin = 0; pin < sc->conf->padconf->npins; pin++) {
                  if (sc->conf->padconf->pins[pin].eint_func == 0)
                          continue;
  
                  nirqs++;
          }
  
          sc->gpio_pic_irqsrc = malloc(sizeof(*sc->gpio_pic_irqsrc) * nirqs,
              M_DEVBUF, M_WAITOK | M_ZERO);
          for (nirqs = 0, pin = 0; pin < sc->conf->padconf->npins; pin++) {
                  if (sc->conf->padconf->pins[pin].eint_func == 0)
                          continue;
  
                  sc->gpio_pic_irqsrc[nirqs].pin = pin;
                  sc->gpio_pic_irqsrc[nirqs].bank = sc->conf->padconf->pins[pin].eint_bank;
                  sc->gpio_pic_irqsrc[nirqs].intnum = sc->conf->padconf->pins[pin].eint_num;
                  sc->gpio_pic_irqsrc[nirqs].intfunc = sc->conf->padconf->pins[pin].eint_func;
                  sc->gpio_pic_irqsrc[nirqs].irq = nirqs;
                  sc->gpio_pic_irqsrc[nirqs].mode = GPIO_INTR_CONFORM;
  
                  err = intr_isrc_register(&sc->gpio_pic_irqsrc[nirqs].isrc,
                      sc->sc_dev, 0, "%s,%s", name,
                      sc->conf->padconf->pins[pin].functions[sc->conf->padconf->pins[pin].eint_func]);
                  if (err) {
                          device_printf(sc->sc_dev, "intr_isrs_register failed for irq %d\n", nirqs);
                  }
  
                  nirqs++;
          }
  
          sc->nirqs = nirqs;
  
          return (0);
  }
  
  static void
  aw_gpio_pic_disable_intr_locked(struct aw_gpio_softc *sc, struct intr_irqsrc *isrc)
  {
          u_int irq;
          uint32_t reg;
  
          AW_GPIO_LOCK_ASSERT(sc);
          irq = ((struct gpio_irqsrc *)isrc)->irq;
          reg = AW_GPIO_READ(sc, AW_GPIO_GP_INT_CTL(sc->gpio_pic_irqsrc[irq].bank));
          reg &= ~(1 << sc->gpio_pic_irqsrc[irq].intnum);
          AW_GPIO_WRITE(sc, AW_GPIO_GP_INT_CTL(sc->gpio_pic_irqsrc[irq].bank), reg);
  
          sc->gpio_pic_irqsrc[irq].enabled = false;
  }
  
  static void
  aw_gpio_pic_disable_intr(device_t dev, struct intr_irqsrc *isrc)
  {
          struct aw_gpio_softc *sc;
  
          sc = device_get_softc(dev);
  
          AW_GPIO_LOCK(sc);
          aw_gpio_pic_disable_intr_locked(sc, isrc);
          AW_GPIO_UNLOCK(sc);
  }
  
  static void
  aw_gpio_pic_enable_intr(device_t dev, struct intr_irqsrc *isrc)
  {
          struct aw_gpio_softc *sc;
          u_int irq;
          uint32_t reg;
  
          sc = device_get_softc(dev);
          irq = ((struct gpio_irqsrc *)isrc)->irq;
          AW_GPIO_LOCK(sc);
          reg = AW_GPIO_READ(sc, AW_GPIO_GP_INT_CTL(sc->gpio_pic_irqsrc[irq].bank));
          reg |= 1 << sc->gpio_pic_irqsrc[irq].intnum;
          AW_GPIO_WRITE(sc, AW_GPIO_GP_INT_CTL(sc->gpio_pic_irqsrc[irq].bank), reg);
          AW_GPIO_UNLOCK(sc);
  
          sc->gpio_pic_irqsrc[irq].enabled = true;
  }
  
  static int
  aw_gpio_pic_map_gpio(struct aw_gpio_softc *sc, struct intr_map_data_gpio *dag,
      u_int *irqp, u_int *mode)
  {
          u_int irq;
          int pin;
  
          irq = dag->gpio_pin_num;
  
          for (pin = 0; pin < sc->nirqs; pin++)
                  if (sc->gpio_pic_irqsrc[pin].pin == irq)
                          break;
          if (pin == sc->nirqs) {
                  device_printf(sc->sc_dev, "Invalid interrupt number %u\n", irq);
                  return (EINVAL);
          }
  
          switch (dag->gpio_intr_mode) {
          case GPIO_INTR_LEVEL_LOW:
          case GPIO_INTR_LEVEL_HIGH:
          case GPIO_INTR_EDGE_RISING:
          case GPIO_INTR_EDGE_FALLING:
          case GPIO_INTR_EDGE_BOTH:
                  break;
          default:
                  device_printf(sc->sc_dev, "Unsupported interrupt mode 0x%8x\n",
                      dag->gpio_intr_mode);
                  return (EINVAL);
          }
  
          *irqp = pin;
          if (mode != NULL)
                  *mode = dag->gpio_intr_mode;
  
          return (0);
  }
  
  static int
  aw_gpio_pic_map_intr(device_t dev, struct intr_map_data *data,
      struct intr_irqsrc **isrcp)
  {
          struct aw_gpio_softc *sc;
          u_int irq;
          int err;
  
          sc = device_get_softc(dev);
          switch (data->type) {
          case INTR_MAP_DATA_GPIO:
                  err = aw_gpio_pic_map_gpio(sc,
                      (struct intr_map_data_gpio *)data,
                    &irq, NULL);
                  break;
          default:
                  return (ENOTSUP);
          };
  
          if (err == 0)
                  *isrcp = &sc->gpio_pic_irqsrc[irq].isrc;
          return (0);
  }
  
  static int
  aw_gpio_pic_setup_intr(device_t dev, struct intr_irqsrc *isrc,
      struct resource *res, struct intr_map_data *data)
  {
          struct aw_gpio_softc *sc;
          uint32_t irqcfg;
          uint32_t pinidx, reg;
          u_int irq, mode;
          int err;
  
          sc = device_get_softc(dev);
  
          err = 0;
          switch (data->type) {
          case INTR_MAP_DATA_GPIO:
                  err = aw_gpio_pic_map_gpio(sc,
                      (struct intr_map_data_gpio *)data,
                    &irq, &mode);
                  if (err != 0)
                          return (err);
                  break;
          default:
                  return (ENOTSUP);
          };
  
          pinidx = (sc->gpio_pic_irqsrc[irq].intnum % 8) * 4;
  
          AW_GPIO_LOCK(sc);
          switch (mode) {
          case GPIO_INTR_LEVEL_LOW:
                  irqcfg = AW_GPIO_INT_LEVEL_LOW << pinidx;
                  break;
          case GPIO_INTR_LEVEL_HIGH:
                  irqcfg = AW_GPIO_INT_LEVEL_HIGH << pinidx;
                  break;
          case GPIO_INTR_EDGE_RISING:
                  irqcfg = AW_GPIO_INT_EDGE_POSITIVE << pinidx;
                  break;
          case GPIO_INTR_EDGE_FALLING:
                  irqcfg = AW_GPIO_INT_EDGE_NEGATIVE << pinidx;
                  break;
          case GPIO_INTR_EDGE_BOTH:
                  irqcfg = AW_GPIO_INT_EDGE_BOTH << pinidx;
                  break;
          }
  
          /* Switch the pin to interrupt mode */
          sc->gpio_pic_irqsrc[irq].oldfunc = aw_gpio_get_function(sc,
              sc->gpio_pic_irqsrc[irq].pin);
          aw_gpio_set_function(sc, sc->gpio_pic_irqsrc[irq].pin,
              sc->gpio_pic_irqsrc[irq].intfunc);
  
          /* Write interrupt mode */
          reg = AW_GPIO_READ(sc, 
              AW_GPIO_GP_INT_CFG(sc->gpio_pic_irqsrc[irq].bank,
              sc->gpio_pic_irqsrc[irq].intnum));
          reg &= ~(0xF << pinidx);
          reg |= irqcfg;
          AW_GPIO_WRITE(sc,
              AW_GPIO_GP_INT_CFG(sc->gpio_pic_irqsrc[irq].bank,
              sc->gpio_pic_irqsrc[irq].intnum),
              reg);
  
          AW_GPIO_UNLOCK(sc);
  
          return (0);
  }
  
  static int
  aw_gpio_pic_teardown_intr(device_t dev, struct intr_irqsrc *isrc,
      struct resource *res, struct intr_map_data *data)
  {
          struct aw_gpio_softc *sc;
          struct gpio_irqsrc *gi;
  
          sc = device_get_softc(dev);
          gi = (struct gpio_irqsrc *)isrc;
  
          /* Switch back the pin to it's original function */
          AW_GPIO_LOCK(sc);
          aw_gpio_set_function(sc, gi->pin, gi->oldfunc);
          AW_GPIO_UNLOCK(sc);
  
          return (0);
  }
  
  static void
  aw_gpio_pic_post_filter(device_t dev, struct intr_irqsrc *isrc)
  {
          struct aw_gpio_softc *sc;
          struct gpio_irqsrc *gi;
  
          sc = device_get_softc(dev);
          gi = (struct gpio_irqsrc *)isrc;
  
          arm_irq_memory_barrier(0);
          AW_GPIO_WRITE(sc, AW_GPIO_GP_INT_STA(gi->bank), 1 << gi->intnum);
  }
  
  static void
  aw_gpio_pic_post_ithread(device_t dev, struct intr_irqsrc *isrc)
  {
          struct aw_gpio_softc *sc;
          struct gpio_irqsrc *gi;
  
          sc = device_get_softc(dev);
          gi = (struct gpio_irqsrc *)isrc;
  
          arm_irq_memory_barrier(0);
          AW_GPIO_WRITE(sc, AW_GPIO_GP_INT_STA(gi->bank), 1 << gi->intnum);
          aw_gpio_pic_enable_intr(dev, isrc);
  }
  
  static void
  aw_gpio_pic_pre_ithread(device_t dev, struct intr_irqsrc *isrc)
  {
          struct aw_gpio_softc *sc;
  
          sc = device_get_softc(dev);
          aw_gpio_pic_disable_intr_locked(sc, isrc);
  }
  
  /*
   * OFWBUS Interface
   */
  static phandle_t
  aw_gpio_get_node(device_t dev, device_t bus)
  {
  
          /* We only have one child, the GPIO bus, which needs our own node. */
          return (ofw_bus_get_node(dev));
  }
  
  static device_method_t aw_gpio_methods[] = {
          /* Device interface */
          DEVMETHOD(device_probe,         aw_gpio_probe),
          DEVMETHOD(device_attach,        aw_gpio_attach),
          DEVMETHOD(device_detach,        aw_gpio_detach),
  
          /* Interrupt controller interface */
          DEVMETHOD(pic_disable_intr,     aw_gpio_pic_disable_intr),
          DEVMETHOD(pic_enable_intr,      aw_gpio_pic_enable_intr),
          DEVMETHOD(pic_map_intr,         aw_gpio_pic_map_intr),
          DEVMETHOD(pic_setup_intr,       aw_gpio_pic_setup_intr),
          DEVMETHOD(pic_teardown_intr,    aw_gpio_pic_teardown_intr),
          DEVMETHOD(pic_post_filter,      aw_gpio_pic_post_filter),
          DEVMETHOD(pic_post_ithread,     aw_gpio_pic_post_ithread),
          DEVMETHOD(pic_pre_ithread,      aw_gpio_pic_pre_ithread),
  
          /* GPIO protocol */
          DEVMETHOD(gpio_get_bus,         aw_gpio_get_bus),
          DEVMETHOD(gpio_pin_max,         aw_gpio_pin_max),
          DEVMETHOD(gpio_pin_getname,     aw_gpio_pin_getname),
          DEVMETHOD(gpio_pin_getflags,    aw_gpio_pin_getflags),
          DEVMETHOD(gpio_pin_getcaps,     aw_gpio_pin_getcaps),
          DEVMETHOD(gpio_pin_setflags,    aw_gpio_pin_setflags),
          DEVMETHOD(gpio_pin_get,         aw_gpio_pin_get),
          DEVMETHOD(gpio_pin_set,         aw_gpio_pin_set),
          DEVMETHOD(gpio_pin_toggle,      aw_gpio_pin_toggle),
          DEVMETHOD(gpio_pin_access_32,   aw_gpio_pin_access_32),
          DEVMETHOD(gpio_pin_config_32,   aw_gpio_pin_config_32),
          DEVMETHOD(gpio_map_gpios,       aw_gpio_map_gpios),
  
          /* ofw_bus interface */
          DEVMETHOD(ofw_bus_get_node,     aw_gpio_get_node),
  
          /* fdt_pinctrl interface */
          DEVMETHOD(fdt_pinctrl_configure,aw_fdt_configure_pins),
  
          DEVMETHOD_END
  };
  
  static devclass_t aw_gpio_devclass;
  
  static driver_t aw_gpio_driver = {
          "gpio",
          aw_gpio_methods,
          sizeof(struct aw_gpio_softc),
  };
  
  EARLY_DRIVER_MODULE(aw_gpio, simplebus, aw_gpio_driver, aw_gpio_devclass, 0, 0,
      BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LATE);

Cache object: cd448af7ca9709a66e2c0a7726fcd20a