/* $NetBSD: am335x_gpio.c,v 1.2 2015/12/08 14:42:24 skrll Exp $ */
/*-
* Copyright (c) 2007 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matt Thomas
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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>
__KERNEL_RCSID(0, "$NetBSD: am335x_gpio.c,v 1.2 2015/12/08 14:42:24 skrll Exp $");
#define _INTR_PRIVATE
#include "locators.h"
#include "gpio.h"
#include "opt_omap.h"
#include <sys/param.h>
#include <sys/evcnt.h>
#include <sys/atomic.h>
#include <uvm/uvm_extern.h>
#include <machine/intr.h>
#include <arm/cpu.h>
#include <arm/armreg.h>
#include <arm/cpufunc.h>
#include <sys/bus.h>
#include <arm/omap/omap2_reg.h>
#include <arm/omap/omap2_obiovar.h>
#include <arm/omap/omap2_gpio.h>
#include <arm/omap/am335x_prcm.h>
#include <arm/omap/omap2_prcm.h>
#include <arm/omap/sitara_cm.h>
#include <arm/omap/sitara_cmreg.h>
#if NGPIO > 0
#include <sys/gpio.h>
#include <dev/gpio/gpiovar.h>
#endif
static const struct omap_module gpio_module[] = {
{ 0, 0 },
{ AM335X_PRCM_CM_PER, CM_PER_GPIO1_CLKCTRL },
{ AM335X_PRCM_CM_PER, CM_PER_GPIO2_CLKCTRL },
{ AM335X_PRCM_CM_PER, CM_PER_GPIO3_CLKCTRL },
};
#define AM335X_GPIO_REVISION 0x000
#define AM335X_GPIO_SYSCONFIG 0x010
#define AM335X_GPIO_EIO 0x020
#define AM335X_GPIO_IRQSTATUS_RAW_0 0x024
#define AM335X_GPIO_IRQSTATUS_RAW_1 0x028
#define AM335X_GPIO_IRQSTATUS_0 0x02c
#define AM335X_GPIO_IRQSTATUS_1 0x030
#define AM335X_GPIO_IRQSTATUS_SET_0 0x034
#define AM335X_GPIO_IRQSTATUS_SET_1 0x038
#define AM335X_GPIO_IRQSTATUS_CLR_0 0x03c
#define AM335X_GPIO_IRQSTATUS_CLR_1 0x040
#define AM335X_GPIO_IRQWAKEN_0 0x044
#define AM335X_GPIO_IRQWAKEN_1 0x048
#define AM335X_GPIO_SYSSTATUS 0x114
#define AM335X_GPIO_CTRL 0x130
#define AM335X_GPIO_OE 0x134
#define AM335X_GPIO_DATAIN 0x138
#define AM335X_GPIO_DATAOUT 0x13c
#define AM335X_GPIO_LEVELDETECT0 0x140
#define AM335X_GPIO_LEVELDETECT1 0x144
#define AM335X_GPIO_RISINGDETECT 0x148
#define AM335X_GPIO_FALLINGDETECT 0x14c
#define AM335X_GPIO_DEBOUNCEENABLE 0x150
#define AM335X_GPIO_DEBOUNCINGTIME 0x154
#define AM335X_GPIO_CLEARDATAOUT 0x190
#define AM335X_GPIO_SETDATAOUT 0x194
struct gpio_softc {
device_t gpio_dev;
bus_space_tag_t gpio_memt;
bus_space_handle_t gpio_memh;
#if NGPIO > 0
struct gpio_chipset_tag gpio_chipset;
gpio_pin_t gpio_pins[32];
#endif
};
#define GPIO_READ(gpio, reg) \
bus_space_read_4((gpio)->gpio_memt, (gpio)->gpio_memh, (reg))
#define GPIO_WRITE(gpio, reg, val) \
bus_space_write_4((gpio)->gpio_memt, (gpio)->gpio_memh, (reg), (val))
static int gpio_match(device_t, cfdata_t, void *);
static void gpio_attach(device_t, device_t, void *);
CFATTACH_DECL_NEW(omap2gpio,
sizeof(struct gpio_softc),
gpio_match, gpio_attach,
NULL, NULL);
#if NGPIO > 0
static int
omap2gpio_pin_read(void *arg, int pin)
{
struct gpio_softc * const gpio = arg;
return (GPIO_READ(gpio, AM335X_GPIO_DATAIN) >> pin) & 1;
}
static void
omap2gpio_pin_write(void *arg, int pin, int value)
{
struct gpio_softc * const gpio = arg;
uint32_t mask = 1 << pin;
uint32_t old, new;
old = GPIO_READ(gpio, AM335X_GPIO_DATAOUT);
if (value)
new = old | mask;
else
new = old & ~mask;
if (old != new)
GPIO_WRITE(gpio, AM335X_GPIO_DATAOUT, new);
}
static void
omap2gpio_pin_ctl(void *arg, int pin, int flags)
{
struct gpio_softc * const gpio = arg;
uint32_t mask = 1 << pin;
uint32_t old, new;
old = GPIO_READ(gpio, AM335X_GPIO_OE);
new = old;
switch (flags & (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT)) {
case GPIO_PIN_INPUT: new |= mask; break;
case GPIO_PIN_OUTPUT: new &= ~mask; break;
default: return;
}
if (old != new)
GPIO_WRITE(gpio, AM335X_GPIO_OE, new);
}
static void
gpio_attach1(device_t self)
{
struct gpio_softc * const gpio = device_private(self);
struct gpio_chipset_tag * const gp = &gpio->gpio_chipset;
struct gpiobus_attach_args gba;
gpio_pin_t *pins;
uint32_t mask, dir, valueout, valuein;
int pin;
gp->gp_cookie = gpio;
gp->gp_pin_read = omap2gpio_pin_read;
gp->gp_pin_write = omap2gpio_pin_write;
gp->gp_pin_ctl = omap2gpio_pin_ctl;
gba.gba_gc = gp;
gba.gba_pins = gpio->gpio_pins;
gba.gba_npins = __arraycount(gpio->gpio_pins);
dir = GPIO_READ(gpio, AM335X_GPIO_OE);
valueout = GPIO_READ(gpio, AM335X_GPIO_DATAOUT);
valuein = GPIO_READ(gpio, AM335X_GPIO_DATAIN);
for (pin = 0, mask = 1, pins = gpio->gpio_pins;
pin < 32; pin++, mask <<= 1, pins++) {
pins->pin_num = pin;
pins->pin_caps = GPIO_PIN_INPUT|GPIO_PIN_OUTPUT;
pins->pin_flags =
(dir & mask) ? GPIO_PIN_INPUT : GPIO_PIN_OUTPUT;
pins->pin_state =
(((dir & mask) ? valuein : valueout) & mask)
? GPIO_PIN_HIGH
: GPIO_PIN_LOW;
}
config_found_ia(self, "gpiobus", &gba, gpiobus_print);
}
#endif /* NGPIO > 0 */
int
gpio_match(device_t parent, cfdata_t cfdata, void *aux)
{
struct obio_attach_args *oa = aux;
#ifdef TI_AM335X
if (oa->obio_addr == GPIO0_BASE_TI_AM335X
|| oa->obio_addr == GPIO1_BASE_TI_AM335X
|| oa->obio_addr == GPIO2_BASE_TI_AM335X
|| oa->obio_addr == GPIO3_BASE_TI_AM335X)
return 1;
#endif
return 0;
}
void
gpio_attach(device_t parent, device_t self, void *aux)
{
struct obio_attach_args * const oa = aux;
struct gpio_softc * const gpio = device_private(self);
int error;
gpio->gpio_dev = self;
if (oa->obio_size == OBIOCF_SIZE_DEFAULT)
panic("\n%s: no size assigned", device_xname(self));
gpio->gpio_memt = oa->obio_iot;
error = bus_space_map(oa->obio_iot, oa->obio_addr, oa->obio_size,
0, &gpio->gpio_memh);
if (error) {
aprint_error(": failed to map register %#lx@%#lx: %d\n",
oa->obio_size, oa->obio_addr, error);
return;
}
aprint_normal("\n");
#ifdef TI_AM335X
switch (oa->obio_addr) {
case GPIO0_BASE_TI_AM335X:
break;
case GPIO1_BASE_TI_AM335X:
prcm_module_enable(&gpio_module[1]);
break;
case GPIO2_BASE_TI_AM335X:
prcm_module_enable(&gpio_module[2]);
break;
case GPIO3_BASE_TI_AM335X:
prcm_module_enable(&gpio_module[3]);
break;
}
#endif
#if NGPIO > 0
gpio_attach1(self);
#endif
}
#if NGPIO > 0
extern struct cfdriver omapgpio_cd;
#define GPIO_MODULE(pin) ((pin) / 32)
#define GPIO_PIN(pin) ((pin) % 32)
u_int
omap2_gpio_read(u_int gpio)
{
struct gpio_softc *sc;
sc = device_lookup_private(&omapgpio_cd, GPIO_MODULE(gpio));
if (sc == NULL)
panic("omap2gpio: GPIO Module for pin %d not configured.", gpio);
return omap2gpio_pin_read(sc, GPIO_PIN(gpio));
}
void
omap2_gpio_write(u_int gpio, u_int value)
{
struct gpio_softc *sc;
sc = device_lookup_private(&omapgpio_cd, GPIO_MODULE(gpio));
if (sc == NULL)
panic("omap2gpio: GPIO Module for pin %d not configured.", gpio);
omap2gpio_pin_write(sc, GPIO_PIN(gpio), value);
}
void
omap2_gpio_ctl(u_int gpio, int flags)
{
struct gpio_softc *sc;
sc = device_lookup_private(&omapgpio_cd, GPIO_MODULE(gpio));
if (sc == NULL)
panic("omap2gpio: GPIO Module for pin %d not configured.", gpio);
omap2gpio_pin_ctl(sc, GPIO_PIN(gpio), flags);
}
bool
omap2_gpio_has_pin(u_int gpio)
{
return device_lookup_private(&omapgpio_cd, GPIO_MODULE(gpio)) != NULL;
}
#endif