freebsd-dev/sys/arm/broadcom/bcm2835/bcm2835_mbox.c

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2012 Oleksandr Tymoshenko <gonzo@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 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/lock.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/sx.h>
#include <sys/rman.h>
#include <machine/bus.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <arm/broadcom/bcm2835/bcm2835_mbox.h>
#include <arm/broadcom/bcm2835/bcm2835_mbox_prop.h>
#include <arm/broadcom/bcm2835/bcm2835_vcbus.h>
#include "mbox_if.h"
#define REG_READ 0x00
#define REG_POL 0x10
#define REG_SENDER 0x14
#define REG_STATUS 0x18
#define STATUS_FULL 0x80000000
#define STATUS_EMPTY 0x40000000
#define REG_CONFIG 0x1C
#define CONFIG_DATA_IRQ 0x00000001
#define REG_WRITE 0x20 /* This is Mailbox 1 address */
#define MBOX_MSG(chan, data) (((data) & ~0xf) | ((chan) & 0xf))
#define MBOX_CHAN(msg) ((msg) & 0xf)
#define MBOX_DATA(msg) ((msg) & ~0xf)
#define MBOX_LOCK(sc) do { \
mtx_lock(&(sc)->lock); \
} while(0)
#define MBOX_UNLOCK(sc) do { \
mtx_unlock(&(sc)->lock); \
} while(0)
#ifdef DEBUG
#define dprintf(fmt, args...) printf(fmt, ##args)
#else
#define dprintf(fmt, args...)
#endif
struct bcm_mbox_softc {
struct mtx lock;
struct resource * mem_res;
struct resource * irq_res;
void* intr_hl;
bus_space_tag_t bst;
bus_space_handle_t bsh;
int msg[BCM2835_MBOX_CHANS];
int have_message[BCM2835_MBOX_CHANS];
struct sx property_chan_lock;
};
#define mbox_read_4(sc, reg) \
bus_space_read_4((sc)->bst, (sc)->bsh, reg)
#define mbox_write_4(sc, reg, val) \
bus_space_write_4((sc)->bst, (sc)->bsh, reg, val)
static struct ofw_compat_data compat_data[] = {
{"broadcom,bcm2835-mbox", 1},
{"brcm,bcm2835-mbox", 1},
{NULL, 0}
};
static int
bcm_mbox_read_msg(struct bcm_mbox_softc *sc, int *ochan)
{
#ifdef DEBUG
uint32_t data;
#endif
uint32_t msg;
int chan;
msg = mbox_read_4(sc, REG_READ);
dprintf("bcm_mbox_intr: raw data %08x\n", msg);
chan = MBOX_CHAN(msg);
#ifdef DEBUG
data = MBOX_DATA(msg);
#endif
if (sc->msg[chan]) {
printf("bcm_mbox_intr: channel %d oveflow\n", chan);
return (1);
}
dprintf("bcm_mbox_intr: chan %d, data %08x\n", chan, data);
sc->msg[chan] = msg;
if (ochan != NULL)
*ochan = chan;
return (0);
}
static void
bcm_mbox_intr(void *arg)
{
struct bcm_mbox_softc *sc = arg;
int chan;
MBOX_LOCK(sc);
while (!(mbox_read_4(sc, REG_STATUS) & STATUS_EMPTY))
if (bcm_mbox_read_msg(sc, &chan) == 0) {
sc->have_message[chan] = 1;
wakeup(&sc->have_message[chan]);
}
MBOX_UNLOCK(sc);
}
static int
bcm_mbox_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
return (ENXIO);
device_set_desc(dev, "BCM2835 VideoCore Mailbox");
return (BUS_PROBE_DEFAULT);
}
static int
bcm_mbox_attach(device_t dev)
{
struct bcm_mbox_softc *sc = device_get_softc(dev);
int i;
int rid = 0;
sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
if (sc->mem_res == NULL) {
device_printf(dev, "could not allocate memory resource\n");
return (ENXIO);
}
sc->bst = rman_get_bustag(sc->mem_res);
sc->bsh = rman_get_bushandle(sc->mem_res);
rid = 0;
sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, RF_ACTIVE);
if (sc->irq_res == NULL) {
device_printf(dev, "could not allocate interrupt resource\n");
return (ENXIO);
}
/* Setup and enable the timer */
if (bus_setup_intr(dev, sc->irq_res, INTR_MPSAFE | INTR_TYPE_MISC,
NULL, bcm_mbox_intr, sc, &sc->intr_hl) != 0) {
bus_release_resource(dev, SYS_RES_IRQ, rid, sc->irq_res);
device_printf(dev, "Unable to setup the clock irq handler.\n");
return (ENXIO);
}
mtx_init(&sc->lock, "vcio mbox", NULL, MTX_DEF);
for (i = 0; i < BCM2835_MBOX_CHANS; i++) {
sc->msg[i] = 0;
sc->have_message[i] = 0;
}
sx_init(&sc->property_chan_lock, "mboxprop");
/* Read all pending messages */
while ((mbox_read_4(sc, REG_STATUS) & STATUS_EMPTY) == 0)
(void)mbox_read_4(sc, REG_READ);
mbox_write_4(sc, REG_CONFIG, CONFIG_DATA_IRQ);
return (0);
}
/*
* Mailbox API
*/
static int
bcm_mbox_write(device_t dev, int chan, uint32_t data)
{
int limit = 1000;
struct bcm_mbox_softc *sc = device_get_softc(dev);
dprintf("bcm_mbox_write: chan %d, data %08x\n", chan, data);
MBOX_LOCK(sc);
sc->have_message[chan] = 0;
while ((mbox_read_4(sc, REG_STATUS) & STATUS_FULL) && --limit)
DELAY(5);
if (limit == 0) {
printf("bcm_mbox_write: STATUS_FULL stuck");
MBOX_UNLOCK(sc);
return (EAGAIN);
}
mbox_write_4(sc, REG_WRITE, MBOX_MSG(chan, data));
MBOX_UNLOCK(sc);
return (0);
}
static int
bcm_mbox_read(device_t dev, int chan, uint32_t *data)
{
struct bcm_mbox_softc *sc = device_get_softc(dev);
int err, read_chan;
dprintf("bcm_mbox_read: chan %d\n", chan);
err = 0;
MBOX_LOCK(sc);
if (!cold) {
if (sc->have_message[chan] == 0) {
if (mtx_sleep(&sc->have_message[chan], &sc->lock, 0,
"mbox", 10*hz) != 0) {
device_printf(dev, "timeout waiting for message on chan %d\n", chan);
err = ETIMEDOUT;
}
}
} else {
do {
/* Wait for a message */
while ((mbox_read_4(sc, REG_STATUS) & STATUS_EMPTY))
;
/* Read the message */
if (bcm_mbox_read_msg(sc, &read_chan) != 0) {
err = EINVAL;
goto out;
}
} while (read_chan != chan);
}
/*
* get data from intr handler, the same channel is never coming
* because of holding sc lock.
*/
*data = MBOX_DATA(sc->msg[chan]);
sc->msg[chan] = 0;
sc->have_message[chan] = 0;
out:
MBOX_UNLOCK(sc);
dprintf("bcm_mbox_read: chan %d, data %08x\n", chan, *data);
return (err);
}
static device_method_t bcm_mbox_methods[] = {
DEVMETHOD(device_probe, bcm_mbox_probe),
DEVMETHOD(device_attach, bcm_mbox_attach),
DEVMETHOD(mbox_read, bcm_mbox_read),
DEVMETHOD(mbox_write, bcm_mbox_write),
DEVMETHOD_END
};
static driver_t bcm_mbox_driver = {
"mbox",
bcm_mbox_methods,
sizeof(struct bcm_mbox_softc),
};
static devclass_t bcm_mbox_devclass;
DRIVER_MODULE(mbox, simplebus, bcm_mbox_driver, bcm_mbox_devclass, 0, 0);
static void
bcm2835_mbox_dma_cb(void *arg, bus_dma_segment_t *segs, int nseg, int err)
{
bus_addr_t *addr;
if (err)
return;
addr = (bus_addr_t *)arg;
*addr = ARMC_TO_VCBUS(segs[0].ds_addr);
}
static void *
bcm2835_mbox_init_dma(device_t dev, size_t len, bus_dma_tag_t *tag,
bus_dmamap_t *map, bus_addr_t *phys)
{
void *buf;
int err;
err = bus_dma_tag_create(bus_get_dma_tag(dev), 16, 0,
bcm283x_dmabus_peripheral_lowaddr(), BUS_SPACE_MAXADDR, NULL, NULL,
len, 1, len, 0, NULL, NULL, tag);
if (err != 0) {
device_printf(dev, "can't create DMA tag\n");
return (NULL);
}
err = bus_dmamem_alloc(*tag, &buf, 0, map);
if (err != 0) {
bus_dma_tag_destroy(*tag);
device_printf(dev, "can't allocate dmamem\n");
return (NULL);
}
err = bus_dmamap_load(*tag, *map, buf, len, bcm2835_mbox_dma_cb,
phys, 0);
if (err != 0) {
bus_dmamem_free(*tag, buf, *map);
bus_dma_tag_destroy(*tag);
device_printf(dev, "can't load DMA map\n");
return (NULL);
}
return (buf);
}
static int
bcm2835_mbox_err(device_t dev, bus_addr_t msg_phys, uint32_t resp_phys,
struct bcm2835_mbox_hdr *msg, size_t len)
{
int idx;
struct bcm2835_mbox_tag_hdr *tag;
uint8_t *last;
if ((uint32_t)msg_phys != resp_phys) {
device_printf(dev, "response channel mismatch\n");
return (EIO);
}
if (msg->code != BCM2835_MBOX_CODE_RESP_SUCCESS) {
device_printf(dev, "mbox response error\n");
return (EIO);
}
/* Loop until the end tag. */
tag = (struct bcm2835_mbox_tag_hdr *)(msg + 1);
last = (uint8_t *)msg + len;
for (idx = 0; tag->tag != 0; idx++) {
if ((tag->val_len & BCM2835_MBOX_TAG_VAL_LEN_RESPONSE) == 0) {
device_printf(dev, "tag %d response error\n", idx);
return (EIO);
}
/* Clear the response bit. */
tag->val_len &= ~BCM2835_MBOX_TAG_VAL_LEN_RESPONSE;
/* Next tag. */
tag = (struct bcm2835_mbox_tag_hdr *)((uint8_t *)tag +
sizeof(*tag) + tag->val_buf_size);
if ((uint8_t *)tag > last) {
device_printf(dev, "mbox buffer size error\n");
return (EIO);
}
}
return (0);
}
int
bcm2835_mbox_property(void *msg, size_t msg_size)
{
struct bcm_mbox_softc *sc;
struct msg_set_power_state *buf;
bus_dma_tag_t msg_tag;
bus_dmamap_t msg_map;
bus_addr_t msg_phys;
uint32_t reg;
device_t mbox;
int err;
/* get mbox device */
mbox = devclass_get_device(devclass_find("mbox"), 0);
if (mbox == NULL)
return (ENXIO);
sc = device_get_softc(mbox);
sx_xlock(&sc->property_chan_lock);
/* Allocate memory for the message */
buf = bcm2835_mbox_init_dma(mbox, msg_size, &msg_tag, &msg_map,
&msg_phys);
if (buf == NULL) {
err = ENOMEM;
goto out;
}
memcpy(buf, msg, msg_size);
bus_dmamap_sync(msg_tag, msg_map,
BUS_DMASYNC_PREWRITE);
MBOX_WRITE(mbox, BCM2835_MBOX_CHAN_PROP, (uint32_t)msg_phys);
MBOX_READ(mbox, BCM2835_MBOX_CHAN_PROP, &reg);
bus_dmamap_sync(msg_tag, msg_map,
BUS_DMASYNC_PREREAD);
memcpy(msg, buf, msg_size);
err = bcm2835_mbox_err(mbox, msg_phys, reg,
(struct bcm2835_mbox_hdr *)msg, msg_size);
bus_dmamap_unload(msg_tag, msg_map);
bus_dmamem_free(msg_tag, buf, msg_map);
bus_dma_tag_destroy(msg_tag);
out:
sx_xunlock(&sc->property_chan_lock);
return (err);
}
int
bcm2835_mbox_set_power_state(uint32_t device_id, boolean_t on)
{
struct msg_set_power_state msg;
int err;
memset(&msg, 0, sizeof(msg));
msg.hdr.buf_size = sizeof(msg);
msg.hdr.code = BCM2835_MBOX_CODE_REQ;
msg.tag_hdr.tag = BCM2835_MBOX_TAG_SET_POWER_STATE;
msg.tag_hdr.val_buf_size = sizeof(msg.body);
msg.tag_hdr.val_len = sizeof(msg.body.req);
msg.body.req.device_id = device_id;
msg.body.req.state = (on ? BCM2835_MBOX_POWER_ON : 0) |
BCM2835_MBOX_POWER_WAIT;
msg.end_tag = 0;
err = bcm2835_mbox_property(&msg, sizeof(msg));
return (err);
}
int
bcm2835_mbox_get_clock_rate(uint32_t clock_id, uint32_t *hz)
{
struct msg_get_clock_rate msg;
int err;
memset(&msg, 0, sizeof(msg));
msg.hdr.buf_size = sizeof(msg);
msg.hdr.code = BCM2835_MBOX_CODE_REQ;
msg.tag_hdr.tag = BCM2835_MBOX_TAG_GET_CLOCK_RATE;
msg.tag_hdr.val_buf_size = sizeof(msg.body);
msg.tag_hdr.val_len = sizeof(msg.body.req);
msg.body.req.clock_id = clock_id;
msg.end_tag = 0;
err = bcm2835_mbox_property(&msg, sizeof(msg));
*hz = msg.body.resp.rate_hz;
return (err);
}
int
bcm2835_mbox_fb_get_w_h(struct bcm2835_fb_config *fb)
{
int err;
struct msg_fb_get_w_h msg;
memset(&msg, 0, sizeof(msg));
msg.hdr.buf_size = sizeof(msg);
msg.hdr.code = BCM2835_MBOX_CODE_REQ;
BCM2835_MBOX_INIT_TAG(&msg.physical_w_h, GET_PHYSICAL_W_H);
msg.physical_w_h.tag_hdr.val_len = 0;
msg.end_tag = 0;
err = bcm2835_mbox_property(&msg, sizeof(msg));
if (err == 0) {
fb->xres = msg.physical_w_h.body.resp.width;
fb->yres = msg.physical_w_h.body.resp.height;
}
return (err);
}
int
bcm2835_mbox_fb_get_bpp(struct bcm2835_fb_config *fb)
{
int err;
struct msg_fb_get_bpp msg;
memset(&msg, 0, sizeof(msg));
msg.hdr.buf_size = sizeof(msg);
msg.hdr.code = BCM2835_MBOX_CODE_REQ;
BCM2835_MBOX_INIT_TAG(&msg.bpp, GET_DEPTH);
msg.bpp.tag_hdr.val_len = 0;
msg.end_tag = 0;
err = bcm2835_mbox_property(&msg, sizeof(msg));
if (err == 0)
fb->bpp = msg.bpp.body.resp.bpp;
return (err);
}
int
bcm2835_mbox_fb_init(struct bcm2835_fb_config *fb)
{
int err;
struct msg_fb_setup msg;
memset(&msg, 0, sizeof(msg));
msg.hdr.buf_size = sizeof(msg);
msg.hdr.code = BCM2835_MBOX_CODE_REQ;
BCM2835_MBOX_INIT_TAG(&msg.physical_w_h, SET_PHYSICAL_W_H);
msg.physical_w_h.body.req.width = fb->xres;
msg.physical_w_h.body.req.height = fb->yres;
BCM2835_MBOX_INIT_TAG(&msg.virtual_w_h, SET_VIRTUAL_W_H);
msg.virtual_w_h.body.req.width = fb->vxres;
msg.virtual_w_h.body.req.height = fb->vyres;
BCM2835_MBOX_INIT_TAG(&msg.offset, SET_VIRTUAL_OFFSET);
msg.offset.body.req.x = fb->xoffset;
msg.offset.body.req.y = fb->yoffset;
BCM2835_MBOX_INIT_TAG(&msg.depth, SET_DEPTH);
msg.depth.body.req.bpp = fb->bpp;
BCM2835_MBOX_INIT_TAG(&msg.alpha, SET_ALPHA_MODE);
msg.alpha.body.req.alpha = BCM2835_MBOX_ALPHA_MODE_IGNORED;
BCM2835_MBOX_INIT_TAG(&msg.buffer, ALLOCATE_BUFFER);
msg.buffer.body.req.alignment = PAGE_SIZE;
BCM2835_MBOX_INIT_TAG(&msg.pitch, GET_PITCH);
msg.end_tag = 0;
err = bcm2835_mbox_property(&msg, sizeof(msg));
if (err == 0) {
fb->xres = msg.physical_w_h.body.resp.width;
fb->yres = msg.physical_w_h.body.resp.height;
fb->vxres = msg.virtual_w_h.body.resp.width;
fb->vyres = msg.virtual_w_h.body.resp.height;
fb->xoffset = msg.offset.body.resp.x;
fb->yoffset = msg.offset.body.resp.y;
fb->pitch = msg.pitch.body.resp.pitch;
fb->base = VCBUS_TO_ARMC(msg.buffer.body.resp.fb_address);
fb->size = msg.buffer.body.resp.fb_size;
}
return (err);
}