d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
647a9d043b
freebsd-dev/sys/arm/at91/at91_pio.c
Warner Losh 210c0e4c87 Add FDT attachment.
2014-02-09 20:56:39 +00:00

636 lines
15 KiB
C
Raw Blame History

/*-
* Copyright (c) 2006 M. Warner Losh. All rights reserved.
* Copyright (C) 2012 Ian Lepore. 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.
*/
#include "opt_platform.h"
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/poll.h>
#include <sys/rman.h>
#include <sys/selinfo.h>
#include <sys/sx.h>
#include <sys/uio.h>
#include <machine/at91_gpio.h>
#include <machine/bus.h>
#include <arm/at91/at91reg.h>
#include <arm/at91/at91_pioreg.h>
#include <arm/at91/at91_piovar.h>
#ifdef FDT
#include <dev/fdt/fdt_common.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#endif
#define MAX_CHANGE 64
struct at91_pio_softc
{
device_t dev; /* Myself */
void *intrhand; /* Interrupt handle */
struct resource *irq_res; /* IRQ resource */
struct resource *mem_res; /* Memory resource */
struct sx sc_mtx; /* basically a perimeter lock */
struct cdev *cdev;
struct selinfo selp;
int buflen;
uint8_t buf[MAX_CHANGE];
int flags;
#define OPENED 1
};
static inline uint32_t
RD4(struct at91_pio_softc *sc, bus_size_t off)
{
return (bus_read_4(sc->mem_res, off));
}
static inline void
WR4(struct at91_pio_softc *sc, bus_size_t off, uint32_t val)
{
bus_write_4(sc->mem_res, off, val);
}
#define AT91_PIO_LOCK(_sc) sx_xlock(&(_sc)->sc_mtx)
#define AT91_PIO_UNLOCK(_sc) sx_xunlock(&(_sc)->sc_mtx)
#define AT91_PIO_LOCK_INIT(_sc) \
sx_init(&_sc->sc_mtx, device_get_nameunit(_sc->dev))
#define AT91_PIO_LOCK_DESTROY(_sc) sx_destroy(&_sc->sc_mtx);
#define AT91_PIO_ASSERT_LOCKED(_sc) sx_assert(&_sc->sc_mtx, SA_XLOCKED);
#define AT91_PIO_ASSERT_UNLOCKED(_sc) sx_assert(&_sc->sc_mtx, SA_UNLOCKED);
#define CDEV2SOFTC(dev) ((dev)->si_drv1)
static devclass_t at91_pio_devclass;
/* bus entry points */
static int at91_pio_probe(device_t dev);
static int at91_pio_attach(device_t dev);
static int at91_pio_detach(device_t dev);
static void at91_pio_intr(void *);
/* helper routines */
static int at91_pio_activate(device_t dev);
static void at91_pio_deactivate(device_t dev);
/* cdev routines */
static d_open_t at91_pio_open;
static d_close_t at91_pio_close;
static d_read_t at91_pio_read;
static d_poll_t at91_pio_poll;
static d_ioctl_t at91_pio_ioctl;
static struct cdevsw at91_pio_cdevsw =
{
.d_version = D_VERSION,
.d_open = at91_pio_open,
.d_close = at91_pio_close,
.d_read = at91_pio_read,
.d_poll = at91_pio_poll,
.d_ioctl = at91_pio_ioctl
};
static int
at91_pio_probe(device_t dev)
{
const char *name;
#ifdef FDT
if (!ofw_bus_is_compatible(dev, "atmel,at91rm9200-gpio"))
return (ENXIO);
#endif
switch (device_get_unit(dev)) {
case 0:
name = "PIOA";
break;
case 1:
name = "PIOB";
break;
case 2:
name = "PIOC";
break;
case 3:
name = "PIOD";
break;
case 4:
name = "PIOE";
break;
case 5:
name = "PIOF";
break;
default:
name = "PIO";
break;
}
device_set_desc(dev, name);
return (0);
}
static int
at91_pio_attach(device_t dev)
{
struct at91_pio_softc *sc;
int err;
sc = device_get_softc(dev);
sc->dev = dev;
err = at91_pio_activate(dev);
if (err)
goto out;
if (bootverbose)
device_printf(dev, "ABSR: %#x OSR: %#x PSR:%#x ODSR: %#x\n",
RD4(sc, PIO_ABSR), RD4(sc, PIO_OSR), RD4(sc, PIO_PSR),
RD4(sc, PIO_ODSR));
AT91_PIO_LOCK_INIT(sc);
/*
* Activate the interrupt, but disable all interrupts in the hardware.
*/
WR4(sc, PIO_IDR, 0xffffffff);
err = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC,
NULL, at91_pio_intr, sc, &sc->intrhand);
if (err) {
AT91_PIO_LOCK_DESTROY(sc);
goto out;
}
sc->cdev = make_dev(&at91_pio_cdevsw, device_get_unit(dev), UID_ROOT,
GID_WHEEL, 0600, "pio%d", device_get_unit(dev));
if (sc->cdev == NULL) {
err = ENOMEM;
goto out;
}
sc->cdev->si_drv1 = sc;
out:
if (err)
at91_pio_deactivate(dev);
return (err);
}
static int
at91_pio_detach(device_t dev)
{
return (EBUSY); /* XXX */
}
static int
at91_pio_activate(device_t dev)
{
struct at91_pio_softc *sc;
int rid;
sc = device_get_softc(dev);
rid = 0;
sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
RF_ACTIVE);
if (sc->mem_res == NULL)
goto errout;
rid = 0;
sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
RF_ACTIVE | RF_SHAREABLE);
if (sc->irq_res == NULL)
goto errout;
return (0);
errout:
at91_pio_deactivate(dev);
return (ENOMEM);
}
static void
at91_pio_deactivate(device_t dev)
{
struct at91_pio_softc *sc;
sc = device_get_softc(dev);
if (sc->intrhand)
bus_teardown_intr(dev, sc->irq_res, sc->intrhand);
sc->intrhand = 0;
bus_generic_detach(sc->dev);
if (sc->mem_res)
bus_release_resource(dev, SYS_RES_MEMORY,
rman_get_rid(sc->mem_res), sc->mem_res);
sc->mem_res = 0;
if (sc->irq_res)
bus_release_resource(dev, SYS_RES_IRQ,
rman_get_rid(sc->irq_res), sc->irq_res);
sc->irq_res = 0;
}
static void
at91_pio_intr(void *xsc)
{
struct at91_pio_softc *sc = xsc;
uint32_t status;
int i;
/* Reading the status also clears the interrupt. */
status = RD4(sc, PIO_ISR) & RD4(sc, PIO_IMR);
if (status != 0) {
AT91_PIO_LOCK(sc);
for (i = 0; status != 0 && sc->buflen < MAX_CHANGE; ++i) {
if (status & 1)
sc->buf[sc->buflen++] = (uint8_t)i;
status >>= 1;
}
AT91_PIO_UNLOCK(sc);
wakeup(sc);
selwakeup(&sc->selp);
}
}
static int
at91_pio_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
{
struct at91_pio_softc *sc;
sc = CDEV2SOFTC(dev);
AT91_PIO_LOCK(sc);
if (!(sc->flags & OPENED)) {
sc->flags |= OPENED;
}
AT91_PIO_UNLOCK(sc);
return (0);
}
static int
at91_pio_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
{
struct at91_pio_softc *sc;
sc = CDEV2SOFTC(dev);
AT91_PIO_LOCK(sc);
sc->flags &= ~OPENED;
AT91_PIO_UNLOCK(sc);
return (0);
}
static int
at91_pio_poll(struct cdev *dev, int events, struct thread *td)
{
struct at91_pio_softc *sc;
int revents = 0;
sc = CDEV2SOFTC(dev);
AT91_PIO_LOCK(sc);
if (events & (POLLIN | POLLRDNORM)) {
if (sc->buflen != 0)
revents |= events & (POLLIN | POLLRDNORM);
else
selrecord(td, &sc->selp);
}
AT91_PIO_UNLOCK(sc);
return (revents);
}
static int
at91_pio_read(struct cdev *dev, struct uio *uio, int flag)
{
struct at91_pio_softc *sc;
int err, ret, len;
sc = CDEV2SOFTC(dev);
AT91_PIO_LOCK(sc);
err = 0;
ret = 0;
while (uio->uio_resid) {
while (sc->buflen == 0 && err == 0)
err = msleep(sc, &sc->sc_mtx, PCATCH | PZERO, "prd", 0);
if (err != 0)
break;
len = MIN(sc->buflen, uio->uio_resid);
err = uiomove(sc->buf, len, uio);
if (err != 0)
break;
/*
* If we read the whole thing no datacopy is needed,
* otherwise we move the data down.
*/
ret += len;
if (sc->buflen == len)
sc->buflen = 0;
else {
bcopy(sc->buf + len, sc->buf, sc->buflen - len);
sc->buflen -= len;
}
/* If there's no data left, end the read. */
if (sc->buflen == 0)
break;
}
AT91_PIO_UNLOCK(sc);
return (err);
}
static void
at91_pio_bang32(struct at91_pio_softc *sc, uint32_t bits, uint32_t datapin,
uint32_t clockpin)
{
int i;
for (i = 0; i < 32; i++) {
if (bits & 0x80000000)
WR4(sc, PIO_SODR, datapin);
else
WR4(sc, PIO_CODR, datapin);
bits <<= 1;
WR4(sc, PIO_CODR, clockpin);
WR4(sc, PIO_SODR, clockpin);
}
}
static void
at91_pio_bang(struct at91_pio_softc *sc, uint8_t bits, uint32_t bitcount,
uint32_t datapin, uint32_t clockpin)
{
int i;
for (i = 0; i < bitcount; i++) {
if (bits & 0x80)
WR4(sc, PIO_SODR, datapin);
else
WR4(sc, PIO_CODR, datapin);
bits <<= 1;
WR4(sc, PIO_CODR, clockpin);
WR4(sc, PIO_SODR, clockpin);
}
}
static int
at91_pio_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
struct thread *td)
{
struct at91_pio_softc *sc;
struct at91_gpio_cfg *cfg;
struct at91_gpio_info *info;
struct at91_gpio_bang *bang;
struct at91_gpio_bang_many *bangmany;
uint32_t i, num;
uint8_t many[1024], *walker;
int err;
int bitcount;
sc = CDEV2SOFTC(dev);
switch(cmd) {
case AT91_GPIO_SET: /* turn bits on */
WR4(sc, PIO_SODR, *(uint32_t *)data);
return (0);
case AT91_GPIO_CLR: /* turn bits off */
WR4(sc, PIO_CODR, *(uint32_t *)data);
return (0);
case AT91_GPIO_READ: /* Get the status of input bits */
*(uint32_t *)data = RD4(sc, PIO_PDSR);
return (0);
case AT91_GPIO_CFG: /* Configure AT91_GPIO pins */
cfg = (struct at91_gpio_cfg *)data;
if (cfg->cfgmask & AT91_GPIO_CFG_INPUT) {
WR4(sc, PIO_OER, cfg->iomask & ~cfg->input);
WR4(sc, PIO_ODR, cfg->iomask & cfg->input);
}
if (cfg->cfgmask & AT91_GPIO_CFG_HI_Z) {
WR4(sc, PIO_MDDR, cfg->iomask & ~cfg->hi_z);
WR4(sc, PIO_MDER, cfg->iomask & cfg->hi_z);
}
if (cfg->cfgmask & AT91_GPIO_CFG_PULLUP) {
WR4(sc, PIO_PUDR, cfg->iomask & ~cfg->pullup);
WR4(sc, PIO_PUER, cfg->iomask & cfg->pullup);
}
if (cfg->cfgmask & AT91_GPIO_CFG_GLITCH) {
WR4(sc, PIO_IFDR, cfg->iomask & ~cfg->glitch);
WR4(sc, PIO_IFER, cfg->iomask & cfg->glitch);
}
if (cfg->cfgmask & AT91_GPIO_CFG_GPIO) {
WR4(sc, PIO_PDR, cfg->iomask & ~cfg->gpio);
WR4(sc, PIO_PER, cfg->iomask & cfg->gpio);
}
if (cfg->cfgmask & AT91_GPIO_CFG_PERIPH) {
WR4(sc, PIO_ASR, cfg->iomask & ~cfg->periph);
WR4(sc, PIO_BSR, cfg->iomask & cfg->periph);
}
if (cfg->cfgmask & AT91_GPIO_CFG_INTR) {
WR4(sc, PIO_IDR, cfg->iomask & ~cfg->intr);
WR4(sc, PIO_IER, cfg->iomask & cfg->intr);
}
return (0);
case AT91_GPIO_BANG:
bang = (struct at91_gpio_bang *)data;
at91_pio_bang32(sc, bang->bits, bang->datapin, bang->clockpin);
return (0);
case AT91_GPIO_BANG_MANY:
bangmany = (struct at91_gpio_bang_many *)data;
walker = (uint8_t *)bangmany->bits;
bitcount = bangmany->numbits;
while (bitcount > 0) {
num = MIN((bitcount + 7) / 8, sizeof(many));
err = copyin(walker, many, num);
if (err)
return err;
for (i = 0; i < num && bitcount > 0; i++, bitcount -= 8)
if (bitcount >= 8)
at91_pio_bang(sc, many[i], 8, bangmany->datapin, bangmany->clockpin);
else
at91_pio_bang(sc, many[i], bitcount, bangmany->datapin, bangmany->clockpin);
walker += num;
}
return (0);
case AT91_GPIO_INFO: /* Learn about this device's AT91_GPIO bits */
info = (struct at91_gpio_info *)data;
info->output_status = RD4(sc, PIO_ODSR);
info->input_status = RD4(sc, PIO_OSR);
info->highz_status = RD4(sc, PIO_MDSR);
info->pullup_status = RD4(sc, PIO_PUSR);
info->glitch_status = RD4(sc, PIO_IFSR);
info->enabled_status = RD4(sc, PIO_PSR);
info->periph_status = RD4(sc, PIO_ABSR);
info->intr_status = RD4(sc, PIO_IMR);
memset(info->extra_status, 0, sizeof(info->extra_status));
return (0);
}
return (ENOTTY);
}
/*
* The following functions are called early in the boot process, so
* don't use bus_space, as that isn't yet available when we need to use
* them.
*/
void
at91_pio_use_periph_a(uint32_t pio, uint32_t periph_a_mask, int use_pullup)
{
uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
PIO[PIO_ASR / 4] = periph_a_mask;
PIO[PIO_PDR / 4] = periph_a_mask;
if (use_pullup)
PIO[PIO_PUER / 4] = periph_a_mask;
else
PIO[PIO_PUDR / 4] = periph_a_mask;
}
void
at91_pio_use_periph_b(uint32_t pio, uint32_t periph_b_mask, int use_pullup)
{
uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
PIO[PIO_BSR / 4] = periph_b_mask;
PIO[PIO_PDR / 4] = periph_b_mask;
if (use_pullup)
PIO[PIO_PUER / 4] = periph_b_mask;
else
PIO[PIO_PUDR / 4] = periph_b_mask;
}
void
at91_pio_use_gpio(uint32_t pio, uint32_t gpio_mask)
{
uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
PIO[PIO_PER / 4] = gpio_mask;
}
void
at91_pio_gpio_input(uint32_t pio, uint32_t input_enable_mask)
{
uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
PIO[PIO_ODR / 4] = input_enable_mask;
}
void
at91_pio_gpio_output(uint32_t pio, uint32_t output_enable_mask, int use_pullup)
{
uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
PIO[PIO_OER / 4] = output_enable_mask;
if (use_pullup)
PIO[PIO_PUER / 4] = output_enable_mask;
else
PIO[PIO_PUDR / 4] = output_enable_mask;
}
void
at91_pio_gpio_high_z(uint32_t pio, uint32_t high_z_mask, int enable)
{
uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
if (enable)
PIO[PIO_MDER / 4] = high_z_mask;
else
PIO[PIO_MDDR / 4] = high_z_mask;
}
void
at91_pio_gpio_set(uint32_t pio, uint32_t data_mask)
{
uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
PIO[PIO_SODR / 4] = data_mask;
}
void
at91_pio_gpio_clear(uint32_t pio, uint32_t data_mask)
{
uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
PIO[PIO_CODR / 4] = data_mask;
}
uint32_t
at91_pio_gpio_get(uint32_t pio, uint32_t data_mask)
{
uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
return (PIO[PIO_PDSR / 4] & data_mask);
}
void
at91_pio_gpio_set_deglitch(uint32_t pio, uint32_t data_mask, int use_deglitch)
{
uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
if (use_deglitch)
PIO[PIO_IFER / 4] = data_mask;
else
PIO[PIO_IFDR / 4] = data_mask;
}
void
at91_pio_gpio_set_interrupt(uint32_t pio, uint32_t data_mask,
int enable_interrupt)
{
uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
if (enable_interrupt)
PIO[PIO_IER / 4] = data_mask;
else
PIO[PIO_IDR / 4] = data_mask;
}
uint32_t
at91_pio_gpio_clear_interrupt(uint32_t pio)
{
uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
/* Reading this register will clear the interrupts. */
return (PIO[PIO_ISR / 4]);
}
static device_method_t at91_pio_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, at91_pio_probe),
DEVMETHOD(device_attach, at91_pio_attach),
DEVMETHOD(device_detach, at91_pio_detach),
DEVMETHOD_END
};
static driver_t at91_pio_driver = {
"at91_pio",
at91_pio_methods,
sizeof(struct at91_pio_softc),
};
#ifdef FDT
DRIVER_MODULE(at91_pio, simplebus, at91_pio_driver, at91_pio_devclass, NULL,
NULL);
#else
DRIVER_MODULE(at91_pio, atmelarm, at91_pio_driver, at91_pio_devclass, NULL,
NULL);
#endif
Reference in New Issue View Git Blame Copy Permalink