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freebsd-dev/sys/arm/ti/ti_gpio.c
Pedro F. Giffuni af3dc4a7ca sys/arm: further adoption of SPDX licensing ID tags. 
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.
2017-11-27 15:04:10 +00:00

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2011 Ben Gray <ben.r.gray@gmail.com>.
* Copyright (c) 2014 Luiz Otavio O Souza <loos@FreeBSD.org>.
* 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 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 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.
*/
/**
* Beware that the OMAP4 datasheet(s) lists GPIO banks 1-6, whereas the code
* here uses 0-5.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_platform.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/proc.h>
#include <sys/rman.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/gpio.h>
#include <sys/interrupt.h>
#include <machine/bus.h>
#include <machine/intr.h>
#include <machine/resource.h>
#include <arm/ti/ti_cpuid.h>
#include <arm/ti/ti_gpio.h>
#include <arm/ti/ti_scm.h>
#include <arm/ti/ti_prcm.h>
#include <arm/ti/ti_hwmods.h>
#include <dev/gpio/gpiobusvar.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include "gpio_if.h"
#include "ti_gpio_if.h"
#include "pic_if.h"
#if !defined(SOC_OMAP4) && !defined(SOC_TI_AM335X)
#error "Unknown SoC"
#endif
/* Register definitions */
#define TI_GPIO_REVISION 0x0000
#define TI_GPIO_SYSCONFIG 0x0010
#define TI_GPIO_IRQSTATUS_RAW_0 0x0024
#define TI_GPIO_IRQSTATUS_RAW_1 0x0028
#define TI_GPIO_IRQSTATUS_0 0x002C /* writing a 0 has no effect */
#define TI_GPIO_IRQSTATUS_1 0x0030 /* writing a 0 has no effect */
#define TI_GPIO_IRQSTATUS_SET_0 0x0034 /* writing a 0 has no effect */
#define TI_GPIO_IRQSTATUS_SET_1 0x0038 /* writing a 0 has no effect */
#define TI_GPIO_IRQSTATUS_CLR_0 0x003C /* writing a 0 has no effect */
#define TI_GPIO_IRQSTATUS_CLR_1 0x0040 /* writing a 0 has no effect */
#define TI_GPIO_IRQWAKEN_0 0x0044
#define TI_GPIO_IRQWAKEN_1 0x0048
#define TI_GPIO_SYSSTATUS 0x0114
#define TI_GPIO_IRQSTATUS1 0x0118
#define TI_GPIO_IRQENABLE1 0x011C
#define TI_GPIO_WAKEUPENABLE 0x0120
#define TI_GPIO_IRQSTATUS2 0x0128
#define TI_GPIO_IRQENABLE2 0x012C
#define TI_GPIO_CTRL 0x0130
#define TI_GPIO_OE 0x0134
#define TI_GPIO_DATAIN 0x0138
#define TI_GPIO_DATAOUT 0x013C
#define TI_GPIO_LEVELDETECT0 0x0140 /* RW register */
#define TI_GPIO_LEVELDETECT1 0x0144 /* RW register */
#define TI_GPIO_RISINGDETECT 0x0148 /* RW register */
#define TI_GPIO_FALLINGDETECT 0x014C /* RW register */
#define TI_GPIO_DEBOUNCENABLE 0x0150
#define TI_GPIO_DEBOUNCINGTIME 0x0154
#define TI_GPIO_CLEARWKUPENA 0x0180
#define TI_GPIO_SETWKUENA 0x0184
#define TI_GPIO_CLEARDATAOUT 0x0190
#define TI_GPIO_SETDATAOUT 0x0194
/* Other SoC Specific definitions */
#define OMAP4_FIRST_GPIO_BANK 1
#define OMAP4_INTR_PER_BANK 1
#define OMAP4_GPIO_REV 0x50600801
#define AM335X_FIRST_GPIO_BANK 0
#define AM335X_INTR_PER_BANK 2
#define AM335X_GPIO_REV 0x50600801
#define PINS_PER_BANK 32
#define TI_GPIO_MASK(p) (1U << ((p) % PINS_PER_BANK))
static int ti_gpio_intr(void *arg);
static int ti_gpio_detach(device_t);
static int ti_gpio_pic_attach(struct ti_gpio_softc *sc);
static int ti_gpio_pic_detach(struct ti_gpio_softc *sc);
static u_int
ti_first_gpio_bank(void)
{
switch(ti_chip()) {
#ifdef SOC_OMAP4
case CHIP_OMAP_4:
return (OMAP4_FIRST_GPIO_BANK);
#endif
#ifdef SOC_TI_AM335X
case CHIP_AM335X:
return (AM335X_FIRST_GPIO_BANK);
#endif
}
return (0);
}
static uint32_t
ti_gpio_rev(void)
{
switch(ti_chip()) {
#ifdef SOC_OMAP4
case CHIP_OMAP_4:
return (OMAP4_GPIO_REV);
#endif
#ifdef SOC_TI_AM335X
case CHIP_AM335X:
return (AM335X_GPIO_REV);
#endif
}
return (0);
}
/**
* Macros for driver mutex locking
*/
#define TI_GPIO_LOCK(_sc) mtx_lock_spin(&(_sc)->sc_mtx)
#define TI_GPIO_UNLOCK(_sc) mtx_unlock_spin(&(_sc)->sc_mtx)
#define TI_GPIO_LOCK_INIT(_sc) \
mtx_init(&_sc->sc_mtx, device_get_nameunit((_sc)->sc_dev), \
"ti_gpio", MTX_SPIN)
#define TI_GPIO_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->sc_mtx)
#define TI_GPIO_ASSERT_LOCKED(_sc) mtx_assert(&(_sc)->sc_mtx, MA_OWNED)
#define TI_GPIO_ASSERT_UNLOCKED(_sc) mtx_assert(&(_sc)->sc_mtx, MA_NOTOWNED)
/**
* ti_gpio_read_4 - reads a 32-bit value from one of the GPIO registers
* @sc: GPIO device context
* @bank: The bank to read from
* @off: The offset of a register from the GPIO register address range
*
*
* RETURNS:
* 32-bit value read from the register.
*/
static inline uint32_t
ti_gpio_read_4(struct ti_gpio_softc *sc, bus_size_t off)
{
return (bus_read_4(sc->sc_mem_res, off));
}
/**
* ti_gpio_write_4 - writes a 32-bit value to one of the GPIO registers
* @sc: GPIO device context
* @bank: The bank to write to
* @off: The offset of a register from the GPIO register address range
* @val: The value to write into the register
*
* RETURNS:
* nothing
*/
static inline void
ti_gpio_write_4(struct ti_gpio_softc *sc, bus_size_t off,
uint32_t val)
{
bus_write_4(sc->sc_mem_res, off, val);
}
static inline void
ti_gpio_intr_clr(struct ti_gpio_softc *sc, uint32_t mask)
{
/* We clear both set of registers. */
ti_gpio_write_4(sc, TI_GPIO_IRQSTATUS_CLR_0, mask);
ti_gpio_write_4(sc, TI_GPIO_IRQSTATUS_CLR_1, mask);
}
static inline void
ti_gpio_intr_set(struct ti_gpio_softc *sc, uint32_t mask)
{
/*
* On OMAP4 we unmask only the MPU interrupt and on AM335x we
* also activate only the first interrupt.
*/
ti_gpio_write_4(sc, TI_GPIO_IRQSTATUS_SET_0, mask);
}
static inline void
ti_gpio_intr_ack(struct ti_gpio_softc *sc, uint32_t mask)
{
/*
* Acknowledge the interrupt on both registers even if we use only
* the first one.
*/
ti_gpio_write_4(sc, TI_GPIO_IRQSTATUS_0, mask);
ti_gpio_write_4(sc, TI_GPIO_IRQSTATUS_1, mask);
}
static inline uint32_t
ti_gpio_intr_status(struct ti_gpio_softc *sc)
{
uint32_t reg;
/* Get the status from both registers. */
reg = ti_gpio_read_4(sc, TI_GPIO_IRQSTATUS_0);
reg |= ti_gpio_read_4(sc, TI_GPIO_IRQSTATUS_1);
return (reg);
}
static device_t
ti_gpio_get_bus(device_t dev)
{
struct ti_gpio_softc *sc;
sc = device_get_softc(dev);
return (sc->sc_busdev);
}
/**
* ti_gpio_pin_max - Returns the maximum number of GPIO pins
* @dev: gpio device handle
* @maxpin: pointer to a value that upon return will contain the maximum number
* of pins in the device.
*
*
* LOCKING:
* No locking required, returns static data.
*
* RETURNS:
* Returns 0 on success otherwise an error code
*/
static int
ti_gpio_pin_max(device_t dev, int *maxpin)
{
*maxpin = PINS_PER_BANK - 1;
return (0);
}
static int
ti_gpio_valid_pin(struct ti_gpio_softc *sc, int pin)
{
if (pin >= sc->sc_maxpin || sc->sc_mem_res == NULL)
return (EINVAL);
return (0);
}
/**
* ti_gpio_pin_getcaps - Gets the capabilities of a given pin
* @dev: gpio device handle
* @pin: the number of the pin
* @caps: pointer to a value that upon return will contain the capabilities
*
* Currently all pins have the same capability, notably:
* - GPIO_PIN_INPUT
* - GPIO_PIN_OUTPUT
* - GPIO_PIN_PULLUP
* - GPIO_PIN_PULLDOWN
* - GPIO_INTR_LEVEL_LOW
* - GPIO_INTR_LEVEL_HIGH
* - GPIO_INTR_EDGE_RISING
* - GPIO_INTR_EDGE_FALLING
* - GPIO_INTR_EDGE_BOTH
*
* LOCKING:
* No locking required, returns static data.
*
* RETURNS:
* Returns 0 on success otherwise an error code
*/
static int
ti_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
{
struct ti_gpio_softc *sc;
sc = device_get_softc(dev);
if (ti_gpio_valid_pin(sc, pin) != 0)
return (EINVAL);
*caps = (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT | GPIO_PIN_PULLUP |
GPIO_PIN_PULLDOWN | GPIO_INTR_LEVEL_LOW | GPIO_INTR_LEVEL_HIGH |
GPIO_INTR_EDGE_RISING | GPIO_INTR_EDGE_FALLING |
GPIO_INTR_EDGE_BOTH);
return (0);
}
/**
* ti_gpio_pin_getflags - Gets the current flags of a given pin
* @dev: gpio device handle
* @pin: the number of the pin
* @flags: upon return will contain the current flags of the pin
*
* Reads the current flags of a given pin, here we actually read the H/W
* registers to determine the flags, rather than storing the value in the
* setflags call.
*
* LOCKING:
* Internally locks the context
*
* RETURNS:
* Returns 0 on success otherwise an error code
*/
static int
ti_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
{
struct ti_gpio_softc *sc;
sc = device_get_softc(dev);
if (ti_gpio_valid_pin(sc, pin) != 0)
return (EINVAL);
/* Get the current pin state */
TI_GPIO_LOCK(sc);
TI_GPIO_GET_FLAGS(dev, pin, flags);
TI_GPIO_UNLOCK(sc);
return (0);
}
/**
* ti_gpio_pin_getname - Gets the name of a given pin
* @dev: gpio device handle
* @pin: the number of the pin
* @name: buffer to put the name in
*
* The driver simply calls the pins gpio_n, where 'n' is obviously the number
* of the pin.
*
* LOCKING:
* No locking required, returns static data.
*
* RETURNS:
* Returns 0 on success otherwise an error code
*/
static int
ti_gpio_pin_getname(device_t dev, uint32_t pin, char *name)
{
struct ti_gpio_softc *sc;
sc = device_get_softc(dev);
if (ti_gpio_valid_pin(sc, pin) != 0)
return (EINVAL);
/* Set a very simple name */
snprintf(name, GPIOMAXNAME, "gpio_%u", pin);
name[GPIOMAXNAME - 1] = '\0';
return (0);
}
/**
* ti_gpio_pin_setflags - Sets the flags for a given pin
* @dev: gpio device handle
* @pin: the number of the pin
* @flags: the flags to set
*
* The flags of the pin correspond to things like input/output mode, pull-ups,
* pull-downs, etc. This driver doesn't support all flags, only the following:
* - GPIO_PIN_INPUT
* - GPIO_PIN_OUTPUT
* - GPIO_PIN_PULLUP
* - GPIO_PIN_PULLDOWN
*
* LOCKING:
* Internally locks the context
*
* RETURNS:
* Returns 0 on success otherwise an error code
*/
static int
ti_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
{
struct ti_gpio_softc *sc;
uint32_t oe;
sc = device_get_softc(dev);
if (ti_gpio_valid_pin(sc, pin) != 0)
return (EINVAL);
/* Set the GPIO mode and state */
TI_GPIO_LOCK(sc);
if (TI_GPIO_SET_FLAGS(dev, pin, flags) != 0) {
TI_GPIO_UNLOCK(sc);
return (EINVAL);
}
/* If configuring as an output set the "output enable" bit */
oe = ti_gpio_read_4(sc, TI_GPIO_OE);
if (flags & GPIO_PIN_INPUT)
oe |= TI_GPIO_MASK(pin);
else
oe &= ~TI_GPIO_MASK(pin);
ti_gpio_write_4(sc, TI_GPIO_OE, oe);
TI_GPIO_UNLOCK(sc);
return (0);
}
/**
* ti_gpio_pin_set - Sets the current level on a GPIO pin
* @dev: gpio device handle
* @pin: the number of the pin
* @value: non-zero value will drive the pin high, otherwise the pin is
* driven low.
*
*
* LOCKING:
* Internally locks the context
*
* RETURNS:
* Returns 0 on success otherwise a error code
*/
static int
ti_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
{
struct ti_gpio_softc *sc;
uint32_t reg;
sc = device_get_softc(dev);
if (ti_gpio_valid_pin(sc, pin) != 0)
return (EINVAL);
TI_GPIO_LOCK(sc);
if (value == GPIO_PIN_LOW)
reg = TI_GPIO_CLEARDATAOUT;
else
reg = TI_GPIO_SETDATAOUT;
ti_gpio_write_4(sc, reg, TI_GPIO_MASK(pin));
TI_GPIO_UNLOCK(sc);
return (0);
}
/**
* ti_gpio_pin_get - Gets the current level on a GPIO pin
* @dev: gpio device handle
* @pin: the number of the pin
* @value: pointer to a value that upond return will contain the pin value
*
* The pin must be configured as an input pin beforehand, otherwise this
* function will fail.
*
* LOCKING:
* Internally locks the context
*
* RETURNS:
* Returns 0 on success otherwise a error code
*/
static int
ti_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *value)
{
struct ti_gpio_softc *sc;
uint32_t oe, reg, val;
sc = device_get_softc(dev);
if (ti_gpio_valid_pin(sc, pin) != 0)
return (EINVAL);
/*
* Return data from output latch when set as output and from the
* input register otherwise.
*/
TI_GPIO_LOCK(sc);
oe = ti_gpio_read_4(sc, TI_GPIO_OE);
if (oe & TI_GPIO_MASK(pin))
reg = TI_GPIO_DATAIN;
else
reg = TI_GPIO_DATAOUT;
val = ti_gpio_read_4(sc, reg);
*value = (val & TI_GPIO_MASK(pin)) ? 1 : 0;
TI_GPIO_UNLOCK(sc);
return (0);
}
/**
* ti_gpio_pin_toggle - Toggles a given GPIO pin
* @dev: gpio device handle
* @pin: the number of the pin
*
*
* LOCKING:
* Internally locks the context
*
* RETURNS:
* Returns 0 on success otherwise a error code
*/
static int
ti_gpio_pin_toggle(device_t dev, uint32_t pin)
{
struct ti_gpio_softc *sc;
uint32_t reg, val;
sc = device_get_softc(dev);
if (ti_gpio_valid_pin(sc, pin) != 0)
return (EINVAL);
/* Toggle the pin */
TI_GPIO_LOCK(sc);
val = ti_gpio_read_4(sc, TI_GPIO_DATAOUT);
if (val & TI_GPIO_MASK(pin))
reg = TI_GPIO_CLEARDATAOUT;
else
reg = TI_GPIO_SETDATAOUT;
ti_gpio_write_4(sc, reg, TI_GPIO_MASK(pin));
TI_GPIO_UNLOCK(sc);
return (0);
}
static int
ti_gpio_bank_init(device_t dev)
{
int pin;
struct ti_gpio_softc *sc;
uint32_t flags, reg_oe, reg_set, rev;
clk_ident_t clk;
sc = device_get_softc(dev);
/* Enable the interface and functional clocks for the module. */
clk = ti_hwmods_get_clock(dev);
if (clk == INVALID_CLK_IDENT) {
device_printf(dev, "failed to get device id based on ti,hwmods\n");
return (EINVAL);
}
sc->sc_bank = clk - GPIO1_CLK + ti_first_gpio_bank();
ti_prcm_clk_enable(clk);
/*
* Read the revision number of the module. TI don't publish the
* actual revision numbers, so instead the values have been
* determined by experimentation.
*/
rev = ti_gpio_read_4(sc, TI_GPIO_REVISION);
/* Check the revision. */
if (rev != ti_gpio_rev()) {
device_printf(dev, "Warning: could not determine the revision "
"of GPIO module (revision:0x%08x)\n", rev);
return (EINVAL);
}
/* Disable interrupts for all pins. */
ti_gpio_intr_clr(sc, 0xffffffff);
/* Init OE register based on pads configuration. */
reg_oe = 0xffffffff;
reg_set = 0;
for (pin = 0; pin < PINS_PER_BANK; pin++) {
TI_GPIO_GET_FLAGS(dev, pin, &flags);
if (flags & GPIO_PIN_OUTPUT) {
reg_oe &= ~(1UL << pin);
if (flags & GPIO_PIN_PULLUP)
reg_set |= (1UL << pin);
}
}
ti_gpio_write_4(sc, TI_GPIO_OE, reg_oe);
if (reg_set)
ti_gpio_write_4(sc, TI_GPIO_SETDATAOUT, reg_set);
return (0);
}
/**
* ti_gpio_attach - attach function for the driver
* @dev: gpio device handle
*
* Allocates and sets up the driver context for all GPIO banks. This function
* expects the memory ranges and IRQs to already be allocated to the driver.
*
* LOCKING:
* None
*
* RETURNS:
* Always returns 0
*/
static int
ti_gpio_attach(device_t dev)
{
struct ti_gpio_softc *sc;
int err;
sc = device_get_softc(dev);
sc->sc_dev = dev;
TI_GPIO_LOCK_INIT(sc);
ti_gpio_pin_max(dev, &sc->sc_maxpin);
sc->sc_maxpin++;
sc->sc_mem_rid = 0;
sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
&sc->sc_mem_rid, RF_ACTIVE);
if (!sc->sc_mem_res) {
device_printf(dev, "Error: could not allocate mem resources\n");
ti_gpio_detach(dev);
return (ENXIO);
}
sc->sc_irq_rid = 0;
sc->sc_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ,
&sc->sc_irq_rid, RF_ACTIVE);
if (!sc->sc_irq_res) {
device_printf(dev, "Error: could not allocate irq resources\n");
ti_gpio_detach(dev);
return (ENXIO);
}
/*
* Register our interrupt filter for each of the IRQ resources.
*/
if (bus_setup_intr(dev, sc->sc_irq_res,
INTR_TYPE_MISC | INTR_MPSAFE, ti_gpio_intr, NULL, sc,
&sc->sc_irq_hdl) != 0) {
device_printf(dev,
"WARNING: unable to register interrupt filter\n");
ti_gpio_detach(dev);
return (ENXIO);
}
if (ti_gpio_pic_attach(sc) != 0) {
device_printf(dev, "WARNING: unable to attach PIC\n");
ti_gpio_detach(dev);
return (ENXIO);
}
/* We need to go through each block and ensure the clocks are running and
* the module is enabled. It might be better to do this only when the
* pins are configured which would result in less power used if the GPIO
* pins weren't used ...
*/
if (sc->sc_mem_res != NULL) {
/* Initialize the GPIO module. */
err = ti_gpio_bank_init(dev);
if (err != 0) {
ti_gpio_detach(dev);
return (err);
}
}
sc->sc_busdev = gpiobus_attach_bus(dev);
if (sc->sc_busdev == NULL) {
ti_gpio_detach(dev);
return (ENXIO);
}
return (0);
}
/**
* ti_gpio_detach - detach function for the driver
* @dev: scm device handle
*
* Allocates and sets up the driver context, this simply entails creating a
* bus mappings for the SCM register set.
*
* LOCKING:
* None
*
* RETURNS:
* Always returns 0
*/
static int
ti_gpio_detach(device_t dev)
{
struct ti_gpio_softc *sc = device_get_softc(dev);
KASSERT(mtx_initialized(&sc->sc_mtx), ("gpio mutex not initialized"));
/* Disable all interrupts */
if (sc->sc_mem_res != NULL)
ti_gpio_intr_clr(sc, 0xffffffff);
if (sc->sc_busdev != NULL)
gpiobus_detach_bus(dev);
if (sc->sc_isrcs != NULL)
ti_gpio_pic_detach(sc);
/* Release the memory and IRQ resources. */
if (sc->sc_irq_hdl) {
bus_teardown_intr(dev, sc->sc_irq_res,
sc->sc_irq_hdl);
}
if (sc->sc_irq_res)
bus_release_resource(dev, SYS_RES_IRQ, sc->sc_irq_rid,
sc->sc_irq_res);
if (sc->sc_mem_res)
bus_release_resource(dev, SYS_RES_MEMORY, sc->sc_mem_rid,
sc->sc_mem_res);
TI_GPIO_LOCK_DESTROY(sc);
return (0);
}
static inline void
ti_gpio_rwreg_modify(struct ti_gpio_softc *sc, uint32_t reg, uint32_t mask,
bool set_bits)
{
uint32_t value;
value = ti_gpio_read_4(sc, reg);
ti_gpio_write_4(sc, reg, set_bits ? value | mask : value & ~mask);
}
static inline void
ti_gpio_isrc_mask(struct ti_gpio_softc *sc, struct ti_gpio_irqsrc *tgi)
{
/* Writing a 0 has no effect. */
ti_gpio_intr_clr(sc, tgi->tgi_mask);
}
static inline void
ti_gpio_isrc_unmask(struct ti_gpio_softc *sc, struct ti_gpio_irqsrc *tgi)
{
/* Writing a 0 has no effect. */
ti_gpio_intr_set(sc, tgi->tgi_mask);
}
static inline void
ti_gpio_isrc_eoi(struct ti_gpio_softc *sc, struct ti_gpio_irqsrc *tgi)
{
/* Writing a 0 has no effect. */
ti_gpio_intr_ack(sc, tgi->tgi_mask);
}
static inline bool
ti_gpio_isrc_is_level(struct ti_gpio_irqsrc *tgi)
{
return (tgi->tgi_mode == GPIO_INTR_LEVEL_LOW ||
tgi->tgi_mode == GPIO_INTR_LEVEL_HIGH);
}
static int
ti_gpio_intr(void *arg)
{
u_int irq;
uint32_t reg;
struct ti_gpio_softc *sc;
struct trapframe *tf;
struct ti_gpio_irqsrc *tgi;
sc = (struct ti_gpio_softc *)arg;
tf = curthread->td_intr_frame;
reg = ti_gpio_intr_status(sc);
for (irq = 0; irq < sc->sc_maxpin; irq++) {
tgi = &sc->sc_isrcs[irq];
if ((reg & tgi->tgi_mask) == 0)
continue;
if (!ti_gpio_isrc_is_level(tgi))
ti_gpio_isrc_eoi(sc, tgi);
if (intr_isrc_dispatch(&tgi->tgi_isrc, tf) != 0) {
ti_gpio_isrc_mask(sc, tgi);
if (ti_gpio_isrc_is_level(tgi))
ti_gpio_isrc_eoi(sc, tgi);
device_printf(sc->sc_dev, "Stray irq %u disabled\n",
irq);
}
}
return (FILTER_HANDLED);
}
static int
ti_gpio_pic_attach(struct ti_gpio_softc *sc)
{
int error;
uint32_t irq;
const char *name;
sc->sc_isrcs = malloc(sizeof(*sc->sc_isrcs) * sc->sc_maxpin, M_DEVBUF,
M_WAITOK | M_ZERO);
name = device_get_nameunit(sc->sc_dev);
for (irq = 0; irq < sc->sc_maxpin; irq++) {
sc->sc_isrcs[irq].tgi_irq = irq;
sc->sc_isrcs[irq].tgi_mask = TI_GPIO_MASK(irq);
sc->sc_isrcs[irq].tgi_mode = GPIO_INTR_CONFORM;
error = intr_isrc_register(&sc->sc_isrcs[irq].tgi_isrc,
sc->sc_dev, 0, "%s,%u", name, irq);
if (error != 0)
return (error); /* XXX deregister ISRCs */
}
if (intr_pic_register(sc->sc_dev,
OF_xref_from_node(ofw_bus_get_node(sc->sc_dev))) == NULL)
return (ENXIO);
return (0);
}
static int
ti_gpio_pic_detach(struct ti_gpio_softc *sc)
{
/*
* There has not been established any procedure yet
* how to detach PIC from living system correctly.
*/
device_printf(sc->sc_dev, "%s: not implemented yet\n", __func__);
return (EBUSY);
}
static void
ti_gpio_pic_config_intr(struct ti_gpio_softc *sc, struct ti_gpio_irqsrc *tgi,
uint32_t mode)
{
TI_GPIO_LOCK(sc);
ti_gpio_rwreg_modify(sc, TI_GPIO_RISINGDETECT, tgi->tgi_mask,
mode == GPIO_INTR_EDGE_RISING || mode == GPIO_INTR_EDGE_BOTH);
ti_gpio_rwreg_modify(sc, TI_GPIO_FALLINGDETECT, tgi->tgi_mask,
mode == GPIO_INTR_EDGE_FALLING || mode == GPIO_INTR_EDGE_BOTH);
ti_gpio_rwreg_modify(sc, TI_GPIO_LEVELDETECT1, tgi->tgi_mask,
mode == GPIO_INTR_LEVEL_HIGH);
ti_gpio_rwreg_modify(sc, TI_GPIO_LEVELDETECT0, tgi->tgi_mask,
mode == GPIO_INTR_LEVEL_LOW);
tgi->tgi_mode = mode;
TI_GPIO_UNLOCK(sc);
}
static void
ti_gpio_pic_disable_intr(device_t dev, struct intr_irqsrc *isrc)
{
struct ti_gpio_softc *sc = device_get_softc(dev);
struct ti_gpio_irqsrc *tgi = (struct ti_gpio_irqsrc *)isrc;
ti_gpio_isrc_mask(sc, tgi);
}
static void
ti_gpio_pic_enable_intr(device_t dev, struct intr_irqsrc *isrc)
{
struct ti_gpio_softc *sc = device_get_softc(dev);
struct ti_gpio_irqsrc *tgi = (struct ti_gpio_irqsrc *)isrc;
arm_irq_memory_barrier(tgi->tgi_irq);
ti_gpio_isrc_unmask(sc, tgi);
}
static int
ti_gpio_pic_map_fdt(struct ti_gpio_softc *sc, struct intr_map_data_fdt *daf,
u_int *irqp, uint32_t *modep)
{
uint32_t mode;
/*
* The first cell is the interrupt number.
* The second cell is used to specify flags:
* bits[3:0] trigger type and level flags:
* 1 = low-to-high edge triggered.
* 2 = high-to-low edge triggered.
* 4 = active high level-sensitive.
* 8 = active low level-sensitive.
*/
if (daf->ncells != 2 || daf->cells[0] >= sc->sc_maxpin)
return (EINVAL);
/* Only reasonable modes are supported. */
if (daf->cells[1] == 1)
mode = GPIO_INTR_EDGE_RISING;
else if (daf->cells[1] == 2)
mode = GPIO_INTR_EDGE_FALLING;
else if (daf->cells[1] == 3)
mode = GPIO_INTR_EDGE_BOTH;
else if (daf->cells[1] == 4)
mode = GPIO_INTR_LEVEL_HIGH;
else if (daf->cells[1] == 8)
mode = GPIO_INTR_LEVEL_LOW;
else
return (EINVAL);
*irqp = daf->cells[0];
if (modep != NULL)
*modep = mode;
return (0);
}
static int
ti_gpio_pic_map_gpio(struct ti_gpio_softc *sc, struct intr_map_data_gpio *dag,
u_int *irqp, uint32_t *modep)
{
uint32_t mode;
if (dag->gpio_pin_num >= sc->sc_maxpin)
return (EINVAL);
mode = dag->gpio_intr_mode;
if (mode != GPIO_INTR_LEVEL_LOW && mode != GPIO_INTR_LEVEL_HIGH &&
mode != GPIO_INTR_EDGE_RISING && mode != GPIO_INTR_EDGE_FALLING &&
mode != GPIO_INTR_EDGE_BOTH)
return (EINVAL);
*irqp = dag->gpio_pin_num;
if (modep != NULL)
*modep = mode;
return (0);
}
static int
ti_gpio_pic_map(struct ti_gpio_softc *sc, struct intr_map_data *data,
u_int *irqp, uint32_t *modep)
{
switch (data->type) {
case INTR_MAP_DATA_FDT:
return (ti_gpio_pic_map_fdt(sc,
(struct intr_map_data_fdt *)data, irqp, modep));
case INTR_MAP_DATA_GPIO:
return (ti_gpio_pic_map_gpio(sc,
(struct intr_map_data_gpio *)data, irqp, modep));
default:
return (ENOTSUP);
}
}
static int
ti_gpio_pic_map_intr(device_t dev, struct intr_map_data *data,
struct intr_irqsrc **isrcp)
{
int error;
u_int irq;
struct ti_gpio_softc *sc = device_get_softc(dev);
error = ti_gpio_pic_map(sc, data, &irq, NULL);
if (error == 0)
*isrcp = &sc->sc_isrcs[irq].tgi_isrc;
return (error);
}
static void
ti_gpio_pic_post_filter(device_t dev, struct intr_irqsrc *isrc)
{
struct ti_gpio_softc *sc = device_get_softc(dev);
struct ti_gpio_irqsrc *tgi = (struct ti_gpio_irqsrc *)isrc;
if (ti_gpio_isrc_is_level(tgi))
ti_gpio_isrc_eoi(sc, tgi);
}
static void
ti_gpio_pic_post_ithread(device_t dev, struct intr_irqsrc *isrc)
{
ti_gpio_pic_enable_intr(dev, isrc);
}
static void
ti_gpio_pic_pre_ithread(device_t dev, struct intr_irqsrc *isrc)
{
struct ti_gpio_softc *sc = device_get_softc(dev);
struct ti_gpio_irqsrc *tgi = (struct ti_gpio_irqsrc *)isrc;
ti_gpio_isrc_mask(sc, tgi);
if (ti_gpio_isrc_is_level(tgi))
ti_gpio_isrc_eoi(sc, tgi);
}
static int
ti_gpio_pic_setup_intr(device_t dev, struct intr_irqsrc *isrc,
struct resource *res, struct intr_map_data *data)
{
u_int irq;
uint32_t mode;
struct ti_gpio_softc *sc;
struct ti_gpio_irqsrc *tgi;
if (data == NULL)
return (ENOTSUP);
sc = device_get_softc(dev);
tgi = (struct ti_gpio_irqsrc *)isrc;
/* Get and check config for an interrupt. */
if (ti_gpio_pic_map(sc, data, &irq, &mode) != 0 || tgi->tgi_irq != irq)
return (EINVAL);
/*
* If this is a setup for another handler,
* only check that its configuration match.
*/
if (isrc->isrc_handlers != 0)
return (tgi->tgi_mode == mode ? 0 : EINVAL);
ti_gpio_pic_config_intr(sc, tgi, mode);
return (0);
}
static int
ti_gpio_pic_teardown_intr(device_t dev, struct intr_irqsrc *isrc,
struct resource *res, struct intr_map_data *data)
{
struct ti_gpio_softc *sc = device_get_softc(dev);
struct ti_gpio_irqsrc *tgi = (struct ti_gpio_irqsrc *)isrc;
if (isrc->isrc_handlers == 0)
ti_gpio_pic_config_intr(sc, tgi, GPIO_INTR_CONFORM);
return (0);
}
static phandle_t
ti_gpio_get_node(device_t bus, device_t dev)
{
/* We only have one child, the GPIO bus, which needs our own node. */
return (ofw_bus_get_node(bus));
}
static device_method_t ti_gpio_methods[] = {
DEVMETHOD(device_attach, ti_gpio_attach),
DEVMETHOD(device_detach, ti_gpio_detach),
/* GPIO protocol */
DEVMETHOD(gpio_get_bus, ti_gpio_get_bus),
DEVMETHOD(gpio_pin_max, ti_gpio_pin_max),
DEVMETHOD(gpio_pin_getname, ti_gpio_pin_getname),
DEVMETHOD(gpio_pin_getflags, ti_gpio_pin_getflags),
DEVMETHOD(gpio_pin_getcaps, ti_gpio_pin_getcaps),
DEVMETHOD(gpio_pin_setflags, ti_gpio_pin_setflags),
DEVMETHOD(gpio_pin_get, ti_gpio_pin_get),
DEVMETHOD(gpio_pin_set, ti_gpio_pin_set),
DEVMETHOD(gpio_pin_toggle, ti_gpio_pin_toggle),
/* Interrupt controller interface */
DEVMETHOD(pic_disable_intr, ti_gpio_pic_disable_intr),
DEVMETHOD(pic_enable_intr, ti_gpio_pic_enable_intr),
DEVMETHOD(pic_map_intr, ti_gpio_pic_map_intr),
DEVMETHOD(pic_setup_intr, ti_gpio_pic_setup_intr),
DEVMETHOD(pic_teardown_intr, ti_gpio_pic_teardown_intr),
DEVMETHOD(pic_post_filter, ti_gpio_pic_post_filter),
DEVMETHOD(pic_post_ithread, ti_gpio_pic_post_ithread),
DEVMETHOD(pic_pre_ithread, ti_gpio_pic_pre_ithread),
/* ofw_bus interface */
DEVMETHOD(ofw_bus_get_node, ti_gpio_get_node),
{0, 0},
};
driver_t ti_gpio_driver = {
"gpio",
ti_gpio_methods,
sizeof(struct ti_gpio_softc),
};
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