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freebsd-nq/sys/mips/atheros/ar71xx_gpio.c
Adrian Chadd accdd12e71 [ar71xx_gpio] handle AR934x and QCA953x GPIO OE polarity. 
For reasons I won't comment on, the AR934x and QCA953x GPIO_OE register
value is inverted - bit set == input, bit clear == output.

So, fix this in the output setting, in reading the initial state from
the boot loader, and also setting any gpiofunc pins that are necessary.
2016-07-31 06:51:34 +00:00

638 lines
16 KiB
C
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/*-
* Copyright (c) 2009, Oleksandr Tymoshenko <gonzo@FreeBSD.org>
* Copyright (c) 2009, 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 unmodified, 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.
*/
/*
* GPIO driver for AR71xx
*/
#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/malloc.h>
#include <sys/mutex.h>
#include <sys/gpio.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <mips/atheros/ar71xxreg.h>
#include <mips/atheros/ar71xx_setup.h>
#include <mips/atheros/ar71xx_cpudef.h>
#include <mips/atheros/ar71xx_gpiovar.h>
#include <dev/gpio/gpiobusvar.h>
#include <mips/atheros/ar933xreg.h>
#include <mips/atheros/ar934xreg.h>
#include <mips/atheros/qca953xreg.h>
#include <mips/atheros/qca955xreg.h>
#include "gpio_if.h"
#define DEFAULT_CAPS (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT)
/*
* Helpers
*/
static void ar71xx_gpio_function_enable(struct ar71xx_gpio_softc *sc,
uint32_t mask);
static void ar71xx_gpio_function_disable(struct ar71xx_gpio_softc *sc,
uint32_t mask);
static void ar71xx_gpio_pin_configure(struct ar71xx_gpio_softc *sc,
struct gpio_pin *pin, uint32_t flags);
/*
* Driver stuff
*/
static int ar71xx_gpio_probe(device_t dev);
static int ar71xx_gpio_attach(device_t dev);
static int ar71xx_gpio_detach(device_t dev);
static int ar71xx_gpio_filter(void *arg);
static void ar71xx_gpio_intr(void *arg);
/*
* GPIO interface
*/
static device_t ar71xx_gpio_get_bus(device_t);
static int ar71xx_gpio_pin_max(device_t dev, int *maxpin);
static int ar71xx_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps);
static int ar71xx_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t
*flags);
static int ar71xx_gpio_pin_getname(device_t dev, uint32_t pin, char *name);
static int ar71xx_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags);
static int ar71xx_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value);
static int ar71xx_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *val);
static int ar71xx_gpio_pin_toggle(device_t dev, uint32_t pin);
/*
* Enable/disable the GPIO function control space.
*
* This is primarily for the AR71xx, which has SPI CS1/CS2, UART, SLIC, I2S
* as GPIO pin options.
*/
static void
ar71xx_gpio_function_enable(struct ar71xx_gpio_softc *sc, uint32_t mask)
{
/*
* XXX TODO: refactor this out into a per-chipset method.
*/
if (ar71xx_soc == AR71XX_SOC_AR9341 ||
ar71xx_soc == AR71XX_SOC_AR9342 ||
ar71xx_soc == AR71XX_SOC_AR9344 ||
ar71xx_soc == AR71XX_SOC_QCA9533 ||
ar71xx_soc == AR71XX_SOC_QCA9533_V2 ||
ar71xx_soc == AR71XX_SOC_QCA9556 ||
ar71xx_soc == AR71XX_SOC_QCA9558)
GPIO_SET_BITS(sc, AR934X_GPIO_REG_FUNC, mask);
else
GPIO_SET_BITS(sc, AR71XX_GPIO_FUNCTION, mask);
}
static void
ar71xx_gpio_function_disable(struct ar71xx_gpio_softc *sc, uint32_t mask)
{
/*
* XXX TODO: refactor this out into a per-chipset method.
*/
if (ar71xx_soc == AR71XX_SOC_AR9341 ||
ar71xx_soc == AR71XX_SOC_AR9342 ||
ar71xx_soc == AR71XX_SOC_AR9344 ||
ar71xx_soc == AR71XX_SOC_QCA9533 ||
ar71xx_soc == AR71XX_SOC_QCA9533_V2 ||
ar71xx_soc == AR71XX_SOC_QCA9556 ||
ar71xx_soc == AR71XX_SOC_QCA9558)
GPIO_CLEAR_BITS(sc, AR934X_GPIO_REG_FUNC, mask);
else
GPIO_CLEAR_BITS(sc, AR71XX_GPIO_FUNCTION, mask);
}
/*
* On most platforms, GPIO_OE is a bitmap where the bit set
* means "enable output."
*
* On AR934x and QCA953x, it's the opposite - the bit set means
* "input enable".
*/
static int
ar71xx_gpio_oe_is_high(void)
{
switch (ar71xx_soc) {
case AR71XX_SOC_AR9344:
case AR71XX_SOC_QCA9533:
case AR71XX_SOC_QCA9533_V2:
return 0;
default:
return 1;
}
}
static void
ar71xx_gpio_oe_set_output(struct ar71xx_gpio_softc *sc, int b)
{
uint32_t mask;
mask = 1 << b;
if (ar71xx_gpio_oe_is_high())
GPIO_SET_BITS(sc, AR71XX_GPIO_OE, mask);
else
GPIO_CLEAR_BITS(sc, AR71XX_GPIO_OE, mask);
}
static void
ar71xx_gpio_oe_set_input(struct ar71xx_gpio_softc *sc, int b)
{
uint32_t mask;
mask = 1 << b;
if (ar71xx_gpio_oe_is_high())
GPIO_CLEAR_BITS(sc, AR71XX_GPIO_OE, mask);
else
GPIO_SET_BITS(sc, AR71XX_GPIO_OE, mask);
}
static void
ar71xx_gpio_pin_configure(struct ar71xx_gpio_softc *sc, struct gpio_pin *pin,
unsigned int flags)
{
/*
* Manage input/output
*/
if (flags & (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT)) {
pin->gp_flags &= ~(GPIO_PIN_INPUT|GPIO_PIN_OUTPUT);
if (flags & GPIO_PIN_OUTPUT) {
pin->gp_flags |= GPIO_PIN_OUTPUT;
ar71xx_gpio_oe_set_output(sc, pin->gp_pin);
} else {
pin->gp_flags |= GPIO_PIN_INPUT;
ar71xx_gpio_oe_set_input(sc, pin->gp_pin);
}
}
}
static device_t
ar71xx_gpio_get_bus(device_t dev)
{
struct ar71xx_gpio_softc *sc;
sc = device_get_softc(dev);
return (sc->busdev);
}
static int
ar71xx_gpio_pin_max(device_t dev, int *maxpin)
{
switch (ar71xx_soc) {
case AR71XX_SOC_AR9130:
case AR71XX_SOC_AR9132:
*maxpin = AR91XX_GPIO_PINS - 1;
break;
case AR71XX_SOC_AR7240:
case AR71XX_SOC_AR7241:
case AR71XX_SOC_AR7242:
*maxpin = AR724X_GPIO_PINS - 1;
break;
case AR71XX_SOC_AR9330:
case AR71XX_SOC_AR9331:
*maxpin = AR933X_GPIO_COUNT - 1;
break;
case AR71XX_SOC_AR9341:
case AR71XX_SOC_AR9342:
case AR71XX_SOC_AR9344:
*maxpin = AR934X_GPIO_COUNT - 1;
break;
case AR71XX_SOC_QCA9533:
case AR71XX_SOC_QCA9533_V2:
*maxpin = QCA953X_GPIO_COUNT - 1;
break;
case AR71XX_SOC_QCA9556:
case AR71XX_SOC_QCA9558:
*maxpin = QCA955X_GPIO_COUNT - 1;
break;
default:
*maxpin = AR71XX_GPIO_PINS - 1;
}
return (0);
}
static int
ar71xx_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
{
struct ar71xx_gpio_softc *sc = device_get_softc(dev);
int i;
for (i = 0; i < sc->gpio_npins; i++) {
if (sc->gpio_pins[i].gp_pin == pin)
break;
}
if (i >= sc->gpio_npins)
return (EINVAL);
GPIO_LOCK(sc);
*caps = sc->gpio_pins[i].gp_caps;
GPIO_UNLOCK(sc);
return (0);
}
static int
ar71xx_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
{
struct ar71xx_gpio_softc *sc = device_get_softc(dev);
int i;
for (i = 0; i < sc->gpio_npins; i++) {
if (sc->gpio_pins[i].gp_pin == pin)
break;
}
if (i >= sc->gpio_npins)
return (EINVAL);
GPIO_LOCK(sc);
*flags = sc->gpio_pins[i].gp_flags;
GPIO_UNLOCK(sc);
return (0);
}
static int
ar71xx_gpio_pin_getname(device_t dev, uint32_t pin, char *name)
{
struct ar71xx_gpio_softc *sc = device_get_softc(dev);
int i;
for (i = 0; i < sc->gpio_npins; i++) {
if (sc->gpio_pins[i].gp_pin == pin)
break;
}
if (i >= sc->gpio_npins)
return (EINVAL);
GPIO_LOCK(sc);
memcpy(name, sc->gpio_pins[i].gp_name, GPIOMAXNAME);
GPIO_UNLOCK(sc);
return (0);
}
static int
ar71xx_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
{
int i;
struct ar71xx_gpio_softc *sc = device_get_softc(dev);
for (i = 0; i < sc->gpio_npins; i++) {
if (sc->gpio_pins[i].gp_pin == pin)
break;
}
if (i >= sc->gpio_npins)
return (EINVAL);
ar71xx_gpio_pin_configure(sc, &sc->gpio_pins[i], flags);
return (0);
}
static int
ar71xx_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
{
struct ar71xx_gpio_softc *sc = device_get_softc(dev);
int i;
for (i = 0; i < sc->gpio_npins; i++) {
if (sc->gpio_pins[i].gp_pin == pin)
break;
}
if (i >= sc->gpio_npins)
return (EINVAL);
if (value)
GPIO_WRITE(sc, AR71XX_GPIO_SET, (1 << pin));
else
GPIO_WRITE(sc, AR71XX_GPIO_CLEAR, (1 << pin));
return (0);
}
static int
ar71xx_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *val)
{
struct ar71xx_gpio_softc *sc = device_get_softc(dev);
int i;
for (i = 0; i < sc->gpio_npins; i++) {
if (sc->gpio_pins[i].gp_pin == pin)
break;
}
if (i >= sc->gpio_npins)
return (EINVAL);
*val = (GPIO_READ(sc, AR71XX_GPIO_IN) & (1 << pin)) ? 1 : 0;
return (0);
}
static int
ar71xx_gpio_pin_toggle(device_t dev, uint32_t pin)
{
int res, i;
struct ar71xx_gpio_softc *sc = device_get_softc(dev);
for (i = 0; i < sc->gpio_npins; i++) {
if (sc->gpio_pins[i].gp_pin == pin)
break;
}
if (i >= sc->gpio_npins)
return (EINVAL);
res = (GPIO_READ(sc, AR71XX_GPIO_IN) & (1 << pin)) ? 1 : 0;
if (res)
GPIO_WRITE(sc, AR71XX_GPIO_CLEAR, (1 << pin));
else
GPIO_WRITE(sc, AR71XX_GPIO_SET, (1 << pin));
return (0);
}
static int
ar71xx_gpio_filter(void *arg)
{
/* TODO: something useful */
return (FILTER_STRAY);
}
static void
ar71xx_gpio_intr(void *arg)
{
struct ar71xx_gpio_softc *sc = arg;
GPIO_LOCK(sc);
/* TODO: something useful */
GPIO_UNLOCK(sc);
}
static int
ar71xx_gpio_probe(device_t dev)
{
device_set_desc(dev, "Atheros AR71XX GPIO driver");
return (0);
}
static int
ar71xx_gpio_attach(device_t dev)
{
struct ar71xx_gpio_softc *sc = device_get_softc(dev);
int i, j, maxpin;
int mask, pinon;
uint32_t oe;
KASSERT((device_get_unit(dev) == 0),
("ar71xx_gpio: Only one gpio module supported"));
mtx_init(&sc->gpio_mtx, device_get_nameunit(dev), NULL, MTX_DEF);
/* Map control/status registers. */
sc->gpio_mem_rid = 0;
sc->gpio_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
&sc->gpio_mem_rid, RF_ACTIVE);
if (sc->gpio_mem_res == NULL) {
device_printf(dev, "couldn't map memory\n");
ar71xx_gpio_detach(dev);
return (ENXIO);
}
if ((sc->gpio_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ,
&sc->gpio_irq_rid, RF_SHAREABLE | RF_ACTIVE)) == NULL) {
device_printf(dev, "unable to allocate IRQ resource\n");
ar71xx_gpio_detach(dev);
return (ENXIO);
}
if ((bus_setup_intr(dev, sc->gpio_irq_res, INTR_TYPE_MISC,
ar71xx_gpio_filter, ar71xx_gpio_intr, sc, &sc->gpio_ih))) {
device_printf(dev,
"WARNING: unable to register interrupt handler\n");
ar71xx_gpio_detach(dev);
return (ENXIO);
}
sc->dev = dev;
/* Enable function bits that are required */
if (resource_int_value(device_get_name(dev), device_get_unit(dev),
"function_set", &mask) == 0) {
device_printf(dev, "function_set: 0x%x\n", mask);
ar71xx_gpio_function_enable(sc, mask);
}
/* Disable function bits that are required */
if (resource_int_value(device_get_name(dev), device_get_unit(dev),
"function_clear", &mask) == 0) {
device_printf(dev, "function_clear: 0x%x\n", mask);
ar71xx_gpio_function_disable(sc, mask);
}
/* Disable interrupts for all pins. */
GPIO_WRITE(sc, AR71XX_GPIO_INT_MASK, 0);
/* Initialise all pins specified in the mask, up to the pin count */
(void) ar71xx_gpio_pin_max(dev, &maxpin);
if (resource_int_value(device_get_name(dev), device_get_unit(dev),
"pinmask", &mask) != 0)
mask = 0;
if (resource_int_value(device_get_name(dev), device_get_unit(dev),
"pinon", &pinon) != 0)
pinon = 0;
device_printf(dev, "gpio pinmask=0x%x\n", mask);
for (j = 0; j <= maxpin; j++) {
if ((mask & (1 << j)) == 0)
continue;
sc->gpio_npins++;
}
/* Iniatilize the GPIO pins, keep the loader settings. */
oe = GPIO_READ(sc, AR71XX_GPIO_OE);
/*
* For AR934x and QCA953x, the meaning of oe is inverted;
* so flip it the right way around so we can parse the GPIO
* state.
*/
if (!ar71xx_gpio_oe_is_high())
oe = ~oe;
sc->gpio_pins = malloc(sizeof(*sc->gpio_pins) * sc->gpio_npins,
M_DEVBUF, M_WAITOK | M_ZERO);
for (i = 0, j = 0; j <= maxpin; j++) {
if ((mask & (1 << j)) == 0)
continue;
snprintf(sc->gpio_pins[i].gp_name, GPIOMAXNAME,
"pin %d", j);
sc->gpio_pins[i].gp_pin = j;
sc->gpio_pins[i].gp_caps = DEFAULT_CAPS;
if (oe & (1 << j))
sc->gpio_pins[i].gp_flags = GPIO_PIN_OUTPUT;
else
sc->gpio_pins[i].gp_flags = GPIO_PIN_INPUT;
i++;
}
/* Turn on the hinted pins. */
for (i = 0; i < sc->gpio_npins; i++) {
j = sc->gpio_pins[i].gp_pin;
if ((pinon & (1 << j)) != 0) {
ar71xx_gpio_pin_setflags(dev, j, GPIO_PIN_OUTPUT);
ar71xx_gpio_pin_set(dev, j, 1);
}
}
/*
* Search through the function hints, in case there's some
* overrides such as LNA control.
*
* hint.gpio.X.func.<pin>.gpiofunc=<func value>
* hint.gpio.X.func.<pin>.gpiomode=1 (for output, default low)
*/
for (i = 0; i <= maxpin; i++) {
char buf[32];
int gpiofunc, gpiomode;
snprintf(buf, 32, "func.%d.gpiofunc", i);
if (resource_int_value(device_get_name(dev),
device_get_unit(dev),
buf,
&gpiofunc) != 0)
continue;
/* Get the mode too */
snprintf(buf, 32, "func.%d.gpiomode", i);
if (resource_int_value(device_get_name(dev),
device_get_unit(dev),
buf,
&gpiomode) != 0)
continue;
/* We only handle mode=1 for now */
if (gpiomode != 1)
continue;
device_printf(dev, "%s: GPIO %d: func=%d, mode=%d\n",
__func__,
i,
gpiofunc,
gpiomode);
/* Set pin value = 0, so it stays low by default */
oe = GPIO_READ(sc, AR71XX_GPIO_OUT);
oe &= ~ (1 << i);
GPIO_WRITE(sc, AR71XX_GPIO_OUT, oe);
/* Set output */
ar71xx_gpio_oe_set_output(sc, i);
/* Finally: Set the output config */
ar71xx_gpio_ouput_configure(i, gpiofunc);
}
sc->busdev = gpiobus_attach_bus(dev);
if (sc->busdev == NULL) {
ar71xx_gpio_detach(dev);
return (ENXIO);
}
return (0);
}
static int
ar71xx_gpio_detach(device_t dev)
{
struct ar71xx_gpio_softc *sc = device_get_softc(dev);
KASSERT(mtx_initialized(&sc->gpio_mtx), ("gpio mutex not initialized"));
gpiobus_detach_bus(dev);
if (sc->gpio_ih)
bus_teardown_intr(dev, sc->gpio_irq_res, sc->gpio_ih);
if (sc->gpio_irq_res)
bus_release_resource(dev, SYS_RES_IRQ, sc->gpio_irq_rid,
sc->gpio_irq_res);
if (sc->gpio_mem_res)
bus_release_resource(dev, SYS_RES_MEMORY, sc->gpio_mem_rid,
sc->gpio_mem_res);
if (sc->gpio_pins)
free(sc->gpio_pins, M_DEVBUF);
mtx_destroy(&sc->gpio_mtx);
return(0);
}
static device_method_t ar71xx_gpio_methods[] = {
DEVMETHOD(device_probe, ar71xx_gpio_probe),
DEVMETHOD(device_attach, ar71xx_gpio_attach),
DEVMETHOD(device_detach, ar71xx_gpio_detach),
/* GPIO protocol */
DEVMETHOD(gpio_get_bus, ar71xx_gpio_get_bus),
DEVMETHOD(gpio_pin_max, ar71xx_gpio_pin_max),
DEVMETHOD(gpio_pin_getname, ar71xx_gpio_pin_getname),
DEVMETHOD(gpio_pin_getflags, ar71xx_gpio_pin_getflags),
DEVMETHOD(gpio_pin_getcaps, ar71xx_gpio_pin_getcaps),
DEVMETHOD(gpio_pin_setflags, ar71xx_gpio_pin_setflags),
DEVMETHOD(gpio_pin_get, ar71xx_gpio_pin_get),
DEVMETHOD(gpio_pin_set, ar71xx_gpio_pin_set),
DEVMETHOD(gpio_pin_toggle, ar71xx_gpio_pin_toggle),
{0, 0},
};
static driver_t ar71xx_gpio_driver = {
"gpio",
ar71xx_gpio_methods,
sizeof(struct ar71xx_gpio_softc),
};
static devclass_t ar71xx_gpio_devclass;
DRIVER_MODULE(ar71xx_gpio, apb, ar71xx_gpio_driver, ar71xx_gpio_devclass, 0, 0);
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