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freebsd-dev/sys/arm/allwinner/a10_gpio.c
Luiz Otavio O Souza fb54940587 Bring a few simplifications to a10_gpio: 
o Return the real hardware state in gpio_pin_getflags() instead of keep
   the last state in an internal table.  Now the driver returns the real
   state of pins (input/output and pull-up/pull-down) at all times.
 o Use a spin mutex.  This is required by interrupts and the 1-wire code.
 o Use better variable names and place parentheses around them in MACROS.
 o Do not lock the driver when returning static data.

Tested with gpioled(4) and DS1820 (1-wire) sensors on banana pi.
2015-07-13 18:19:26 +00:00

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/*-
* 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 <machine/bus.h>
#include <machine/cpu.h>
#include <machine/cpufunc.h>
#include <machine/resource.h>
#include <machine/intr.h>
#include <dev/fdt/fdt_common.h>
#include <dev/gpio/gpiobusvar.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include "gpio_if.h"
#include "a10_gpio.h"
/*
* A10 have 9 banks of gpio.
* 32 pins per bank:
* PA0 - PA17 | PB0 - PB23 | PC0 - PC24
* PD0 - PD27 | PE0 - PE31 | PF0 - PF5
* PG0 - PG9 | PH0 - PH27 | PI0 - PI12
*/
#define A10_GPIO_PINS 288
#define A10_GPIO_DEFAULT_CAPS (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT | \
GPIO_PIN_PULLUP | GPIO_PIN_PULLDOWN)
#define A10_GPIO_NONE 0
#define A10_GPIO_PULLUP 1
#define A10_GPIO_PULLDOWN 2
#define A10_GPIO_INPUT 0
#define A10_GPIO_OUTPUT 1
struct a10_gpio_softc {
device_t sc_dev;
device_t sc_busdev;
struct mtx sc_mtx;
struct resource * sc_mem_res;
struct resource * sc_irq_res;
bus_space_tag_t sc_bst;
bus_space_handle_t sc_bsh;
void * sc_intrhand;
};
#define A10_GPIO_LOCK(_sc) mtx_lock_spin(&(_sc)->sc_mtx)
#define A10_GPIO_UNLOCK(_sc) mtx_unlock_spin(&(_sc)->sc_mtx)
#define A10_GPIO_LOCK_ASSERT(_sc) mtx_assert(&(_sc)->sc_mtx, MA_OWNED)
#define A10_GPIO_GP_CFG(_bank, _idx) 0x00 + ((_bank) * 0x24) + ((_idx) << 2)
#define A10_GPIO_GP_DAT(_bank) 0x10 + ((_bank) * 0x24)
#define A10_GPIO_GP_DRV(_bank, _idx) 0x14 + ((_bank) * 0x24) + ((_idx) << 2)
#define A10_GPIO_GP_PUL(_bank, _idx) 0x1c + ((_bank) * 0x24) + ((_idx) << 2)
#define A10_GPIO_GP_INT_CFG0 0x200
#define A10_GPIO_GP_INT_CFG1 0x204
#define A10_GPIO_GP_INT_CFG2 0x208
#define A10_GPIO_GP_INT_CFG3 0x20c
#define A10_GPIO_GP_INT_CTL 0x210
#define A10_GPIO_GP_INT_STA 0x214
#define A10_GPIO_GP_INT_DEB 0x218
static struct a10_gpio_softc *a10_gpio_sc;
#define A10_GPIO_WRITE(_sc, _off, _val) \
bus_space_write_4(_sc->sc_bst, _sc->sc_bsh, _off, _val)
#define A10_GPIO_READ(_sc, _off) \
bus_space_read_4(_sc->sc_bst, _sc->sc_bsh, _off)
static uint32_t
a10_gpio_get_function(struct a10_gpio_softc *sc, uint32_t pin)
{
uint32_t bank, func, offset;
/* Must be called with lock held. */
A10_GPIO_LOCK_ASSERT(sc);
bank = pin / 32;
pin = pin % 32;
offset = ((pin & 0x07) << 2);
func = A10_GPIO_READ(sc, A10_GPIO_GP_CFG(bank, pin >> 3));
switch ((func >> offset) & 0x7) {
case A10_GPIO_INPUT:
return (GPIO_PIN_INPUT);
case A10_GPIO_OUTPUT:
return (GPIO_PIN_OUTPUT);
}
return (0);
}
static void
a10_gpio_set_function(struct a10_gpio_softc *sc, uint32_t pin, uint32_t f)
{
uint32_t bank, data, offset;
/* Must be called with lock held. */
A10_GPIO_LOCK_ASSERT(sc);
bank = pin / 32;
pin = pin % 32;
offset = ((pin & 0x07) << 2);
data = A10_GPIO_READ(sc, A10_GPIO_GP_CFG(bank, pin >> 3));
data &= ~(7 << offset);
data |= (f << offset);
A10_GPIO_WRITE(sc, A10_GPIO_GP_CFG(bank, pin >> 3), data);
}
static uint32_t
a10_gpio_get_pud(struct a10_gpio_softc *sc, uint32_t pin)
{
uint32_t bank, offset, val;
/* Must be called with lock held. */
A10_GPIO_LOCK_ASSERT(sc);
bank = pin / 32;
pin = pin % 32;
offset = ((pin & 0x0f) << 1);
val = A10_GPIO_READ(sc, A10_GPIO_GP_PUL(bank, pin >> 4));
switch ((val >> offset) & 0x3) {
case A10_GPIO_PULLDOWN:
return (GPIO_PIN_PULLDOWN);
case A10_GPIO_PULLUP:
return (GPIO_PIN_PULLUP);
}
return (0);
}
static void
a10_gpio_set_pud(struct a10_gpio_softc *sc, uint32_t pin, uint32_t state)
{
uint32_t bank, offset, val;
/* Must be called with lock held. */
A10_GPIO_LOCK_ASSERT(sc);
bank = pin / 32;
pin = pin % 32;
offset = ((pin & 0x0f) << 1);
val = A10_GPIO_READ(sc, A10_GPIO_GP_PUL(bank, pin >> 4));
val &= ~(0x03 << offset);
val |= (state << offset);
A10_GPIO_WRITE(sc, A10_GPIO_GP_PUL(bank, pin >> 4), val);
}
static void
a10_gpio_pin_configure(struct a10_gpio_softc *sc, uint32_t pin, uint32_t flags)
{
/* Must be called with lock held. */
A10_GPIO_LOCK_ASSERT(sc);
/* Manage input/output. */
if (flags & (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT)) {
if (flags & GPIO_PIN_OUTPUT)
a10_gpio_set_function(sc, pin, A10_GPIO_OUTPUT);
else
a10_gpio_set_function(sc, pin, A10_GPIO_INPUT);
}
/* Manage Pull-up/pull-down. */
if (flags & (GPIO_PIN_PULLUP | GPIO_PIN_PULLDOWN)) {
if (flags & GPIO_PIN_PULLUP)
a10_gpio_set_pud(sc, pin, A10_GPIO_PULLUP);
else
a10_gpio_set_pud(sc, pin, A10_GPIO_PULLDOWN);
} else
a10_gpio_set_pud(sc, pin, A10_GPIO_NONE);
}
static device_t
a10_gpio_get_bus(device_t dev)
{
struct a10_gpio_softc *sc;
sc = device_get_softc(dev);
return (sc->sc_busdev);
}
static int
a10_gpio_pin_max(device_t dev, int *maxpin)
{
*maxpin = A10_GPIO_PINS - 1;
return (0);
}
static int
a10_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
{
if (pin >= A10_GPIO_PINS)
return (EINVAL);
*caps = A10_GPIO_DEFAULT_CAPS;
return (0);
}
static int
a10_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
{
struct a10_gpio_softc *sc;
if (pin >= A10_GPIO_PINS)
return (EINVAL);
sc = device_get_softc(dev);
A10_GPIO_LOCK(sc);
*flags = a10_gpio_get_function(sc, pin);
*flags |= a10_gpio_get_pud(sc, pin);
A10_GPIO_UNLOCK(sc);
return (0);
}
static int
a10_gpio_pin_getname(device_t dev, uint32_t pin, char *name)
{
uint32_t bank;
if (pin >= A10_GPIO_PINS)
return (EINVAL);
bank = pin / 32;
snprintf(name, GPIOMAXNAME - 1, "pin %d (P%c%d)",
pin, bank + 'A', pin % 32);
name[GPIOMAXNAME - 1] = '\0';
return (0);
}
static int
a10_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
{
struct a10_gpio_softc *sc;
if (pin >= A10_GPIO_PINS)
return (EINVAL);
sc = device_get_softc(dev);
A10_GPIO_LOCK(sc);
a10_gpio_pin_configure(sc, pin, flags);
A10_GPIO_UNLOCK(sc);
return (0);
}
static int
a10_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
{
struct a10_gpio_softc *sc;
uint32_t bank, data;
if (pin >= A10_GPIO_PINS)
return (EINVAL);
bank = pin / 32;
pin = pin % 32;
sc = device_get_softc(dev);
A10_GPIO_LOCK(sc);
data = A10_GPIO_READ(sc, A10_GPIO_GP_DAT(bank));
if (value)
data |= (1 << pin);
else
data &= ~(1 << pin);
A10_GPIO_WRITE(sc, A10_GPIO_GP_DAT(bank), data);
A10_GPIO_UNLOCK(sc);
return (0);
}
static int
a10_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *val)
{
struct a10_gpio_softc *sc;
uint32_t bank, reg_data;
if (pin >= A10_GPIO_PINS)
return (EINVAL);
bank = pin / 32;
pin = pin % 32;
sc = device_get_softc(dev);
A10_GPIO_LOCK(sc);
reg_data = A10_GPIO_READ(sc, A10_GPIO_GP_DAT(bank));
A10_GPIO_UNLOCK(sc);
*val = (reg_data & (1 << pin)) ? 1 : 0;
return (0);
}
static int
a10_gpio_pin_toggle(device_t dev, uint32_t pin)
{
struct a10_gpio_softc *sc;
uint32_t bank, data;
if (pin >= A10_GPIO_PINS)
return (EINVAL);
bank = pin / 32;
pin = pin % 32;
sc = device_get_softc(dev);
A10_GPIO_LOCK(sc);
data = A10_GPIO_READ(sc, A10_GPIO_GP_DAT(bank));
if (data & (1 << pin))
data &= ~(1 << pin);
else
data |= (1 << pin);
A10_GPIO_WRITE(sc, A10_GPIO_GP_DAT(bank), data);
A10_GPIO_UNLOCK(sc);
return (0);
}
static int
a10_gpio_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (!ofw_bus_is_compatible(dev, "allwinner,sun4i-gpio"))
return (ENXIO);
device_set_desc(dev, "Allwinner GPIO controller");
return (BUS_PROBE_DEFAULT);
}
static int
a10_gpio_attach(device_t dev)
{
int rid;
phandle_t gpio;
struct a10_gpio_softc *sc;
sc = device_get_softc(dev);
sc->sc_dev = dev;
mtx_init(&sc->sc_mtx, "a10 gpio", "gpio", MTX_SPIN);
rid = 0;
sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
RF_ACTIVE);
if (!sc->sc_mem_res) {
device_printf(dev, "cannot allocate memory window\n");
goto fail;
}
sc->sc_bst = rman_get_bustag(sc->sc_mem_res);
sc->sc_bsh = rman_get_bushandle(sc->sc_mem_res);
rid = 0;
sc->sc_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
RF_ACTIVE);
if (!sc->sc_irq_res) {
device_printf(dev, "cannot allocate interrupt\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;
a10_gpio_sc = sc;
sc->sc_busdev = gpiobus_attach_bus(dev);
if (sc->sc_busdev == NULL)
goto fail;
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);
return (ENXIO);
}
static int
a10_gpio_detach(device_t dev)
{
return (EBUSY);
}
static phandle_t
a10_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 a10_gpio_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, a10_gpio_probe),
DEVMETHOD(device_attach, a10_gpio_attach),
DEVMETHOD(device_detach, a10_gpio_detach),
/* GPIO protocol */
DEVMETHOD(gpio_get_bus, a10_gpio_get_bus),
DEVMETHOD(gpio_pin_max, a10_gpio_pin_max),
DEVMETHOD(gpio_pin_getname, a10_gpio_pin_getname),
DEVMETHOD(gpio_pin_getflags, a10_gpio_pin_getflags),
DEVMETHOD(gpio_pin_getcaps, a10_gpio_pin_getcaps),
DEVMETHOD(gpio_pin_setflags, a10_gpio_pin_setflags),
DEVMETHOD(gpio_pin_get, a10_gpio_pin_get),
DEVMETHOD(gpio_pin_set, a10_gpio_pin_set),
DEVMETHOD(gpio_pin_toggle, a10_gpio_pin_toggle),
/* ofw_bus interface */
DEVMETHOD(ofw_bus_get_node, a10_gpio_get_node),
DEVMETHOD_END
};
static devclass_t a10_gpio_devclass;
static driver_t a10_gpio_driver = {
"gpio",
a10_gpio_methods,
sizeof(struct a10_gpio_softc),
};
DRIVER_MODULE(a10_gpio, simplebus, a10_gpio_driver, a10_gpio_devclass, 0, 0);
int
a10_gpio_ethernet_activate(uint32_t func)
{
int i;
struct a10_gpio_softc *sc = a10_gpio_sc;
if (sc == NULL)
return (ENXIO);
/* Configure pin mux settings for MII. */
A10_GPIO_LOCK(sc);
for (i = 0; i <= 17; i++)
a10_gpio_set_function(sc, i, func);
A10_GPIO_UNLOCK(sc);
return (0);
}
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