We could maintain the static conversions for the !AArch64 Raspberry Pis, but I'm not sure it's worth it -- we'll traverse the platform list exactly once (of which there are only two for armv7), then every conversion there-after traverses the memory map listing of which there are at-most two entries for these boards: sdram and peripheral space. Detecting this at runtime is necessary for the AArch64 SOC, though, because of the distinct IO windows being otherwise not discernible just from support compiled into the kernel. We currently select the correct window based on /compatible in the FDT. We also use a similar mechanism to describe the DMA restrictions- the RPi 4 can have up to 4GB of RAM while the DMA controller and mailbox mechanism can technically, kind of, only access the lowest 1GB. See the comment in bcm2835_vcbus.h for a fun description/clarification of this. Differential Revision: https://reviews.freebsd.org/D22301
563 lines
14 KiB
C
563 lines
14 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2012 Oleksandr Tymoshenko <gonzo@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/sx.h>
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#include <sys/rman.h>
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#include <machine/bus.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <arm/broadcom/bcm2835/bcm2835_mbox.h>
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#include <arm/broadcom/bcm2835/bcm2835_mbox_prop.h>
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#include <arm/broadcom/bcm2835/bcm2835_vcbus.h>
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#include "mbox_if.h"
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#define REG_READ 0x00
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#define REG_POL 0x10
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#define REG_SENDER 0x14
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#define REG_STATUS 0x18
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#define STATUS_FULL 0x80000000
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#define STATUS_EMPTY 0x40000000
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#define REG_CONFIG 0x1C
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#define CONFIG_DATA_IRQ 0x00000001
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#define REG_WRITE 0x20 /* This is Mailbox 1 address */
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#define MBOX_MSG(chan, data) (((data) & ~0xf) | ((chan) & 0xf))
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#define MBOX_CHAN(msg) ((msg) & 0xf)
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#define MBOX_DATA(msg) ((msg) & ~0xf)
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#define MBOX_LOCK(sc) do { \
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mtx_lock(&(sc)->lock); \
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} while(0)
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#define MBOX_UNLOCK(sc) do { \
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mtx_unlock(&(sc)->lock); \
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} while(0)
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#ifdef DEBUG
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#define dprintf(fmt, args...) printf(fmt, ##args)
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#else
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#define dprintf(fmt, args...)
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#endif
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struct bcm_mbox_softc {
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struct mtx lock;
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struct resource * mem_res;
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struct resource * irq_res;
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void* intr_hl;
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bus_space_tag_t bst;
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bus_space_handle_t bsh;
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int msg[BCM2835_MBOX_CHANS];
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int have_message[BCM2835_MBOX_CHANS];
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struct sx property_chan_lock;
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};
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#define mbox_read_4(sc, reg) \
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bus_space_read_4((sc)->bst, (sc)->bsh, reg)
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#define mbox_write_4(sc, reg, val) \
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bus_space_write_4((sc)->bst, (sc)->bsh, reg, val)
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static struct ofw_compat_data compat_data[] = {
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{"broadcom,bcm2835-mbox", 1},
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{"brcm,bcm2835-mbox", 1},
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{NULL, 0}
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};
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static int
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bcm_mbox_read_msg(struct bcm_mbox_softc *sc, int *ochan)
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{
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#ifdef DEBUG
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uint32_t data;
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#endif
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uint32_t msg;
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int chan;
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msg = mbox_read_4(sc, REG_READ);
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dprintf("bcm_mbox_intr: raw data %08x\n", msg);
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chan = MBOX_CHAN(msg);
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#ifdef DEBUG
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data = MBOX_DATA(msg);
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#endif
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if (sc->msg[chan]) {
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printf("bcm_mbox_intr: channel %d oveflow\n", chan);
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return (1);
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}
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dprintf("bcm_mbox_intr: chan %d, data %08x\n", chan, data);
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sc->msg[chan] = msg;
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if (ochan != NULL)
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*ochan = chan;
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return (0);
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}
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static void
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bcm_mbox_intr(void *arg)
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{
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struct bcm_mbox_softc *sc = arg;
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int chan;
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MBOX_LOCK(sc);
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while (!(mbox_read_4(sc, REG_STATUS) & STATUS_EMPTY))
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if (bcm_mbox_read_msg(sc, &chan) == 0) {
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sc->have_message[chan] = 1;
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wakeup(&sc->have_message[chan]);
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}
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MBOX_UNLOCK(sc);
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}
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static int
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bcm_mbox_probe(device_t dev)
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{
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
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return (ENXIO);
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device_set_desc(dev, "BCM2835 VideoCore Mailbox");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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bcm_mbox_attach(device_t dev)
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{
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struct bcm_mbox_softc *sc = device_get_softc(dev);
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int i;
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int rid = 0;
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sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
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if (sc->mem_res == NULL) {
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device_printf(dev, "could not allocate memory resource\n");
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return (ENXIO);
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}
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sc->bst = rman_get_bustag(sc->mem_res);
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sc->bsh = rman_get_bushandle(sc->mem_res);
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rid = 0;
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sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, RF_ACTIVE);
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if (sc->irq_res == NULL) {
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device_printf(dev, "could not allocate interrupt resource\n");
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return (ENXIO);
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}
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/* Setup and enable the timer */
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if (bus_setup_intr(dev, sc->irq_res, INTR_MPSAFE | INTR_TYPE_MISC,
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NULL, bcm_mbox_intr, sc, &sc->intr_hl) != 0) {
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bus_release_resource(dev, SYS_RES_IRQ, rid, sc->irq_res);
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device_printf(dev, "Unable to setup the clock irq handler.\n");
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return (ENXIO);
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}
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mtx_init(&sc->lock, "vcio mbox", NULL, MTX_DEF);
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for (i = 0; i < BCM2835_MBOX_CHANS; i++) {
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sc->msg[i] = 0;
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sc->have_message[i] = 0;
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}
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sx_init(&sc->property_chan_lock, "mboxprop");
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/* Read all pending messages */
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while ((mbox_read_4(sc, REG_STATUS) & STATUS_EMPTY) == 0)
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(void)mbox_read_4(sc, REG_READ);
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mbox_write_4(sc, REG_CONFIG, CONFIG_DATA_IRQ);
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return (0);
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}
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/*
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* Mailbox API
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*/
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static int
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bcm_mbox_write(device_t dev, int chan, uint32_t data)
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{
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int limit = 1000;
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struct bcm_mbox_softc *sc = device_get_softc(dev);
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dprintf("bcm_mbox_write: chan %d, data %08x\n", chan, data);
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MBOX_LOCK(sc);
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sc->have_message[chan] = 0;
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while ((mbox_read_4(sc, REG_STATUS) & STATUS_FULL) && --limit)
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DELAY(5);
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if (limit == 0) {
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printf("bcm_mbox_write: STATUS_FULL stuck");
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MBOX_UNLOCK(sc);
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return (EAGAIN);
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}
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mbox_write_4(sc, REG_WRITE, MBOX_MSG(chan, data));
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MBOX_UNLOCK(sc);
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return (0);
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}
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static int
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bcm_mbox_read(device_t dev, int chan, uint32_t *data)
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{
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struct bcm_mbox_softc *sc = device_get_softc(dev);
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int err, read_chan;
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dprintf("bcm_mbox_read: chan %d\n", chan);
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err = 0;
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MBOX_LOCK(sc);
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if (!cold) {
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if (sc->have_message[chan] == 0) {
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if (mtx_sleep(&sc->have_message[chan], &sc->lock, 0,
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"mbox", 10*hz) != 0) {
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device_printf(dev, "timeout waiting for message on chan %d\n", chan);
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err = ETIMEDOUT;
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}
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}
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} else {
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do {
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/* Wait for a message */
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while ((mbox_read_4(sc, REG_STATUS) & STATUS_EMPTY))
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;
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/* Read the message */
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if (bcm_mbox_read_msg(sc, &read_chan) != 0) {
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err = EINVAL;
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goto out;
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}
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} while (read_chan != chan);
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}
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/*
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* get data from intr handler, the same channel is never coming
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* because of holding sc lock.
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*/
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*data = MBOX_DATA(sc->msg[chan]);
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sc->msg[chan] = 0;
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sc->have_message[chan] = 0;
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out:
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MBOX_UNLOCK(sc);
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dprintf("bcm_mbox_read: chan %d, data %08x\n", chan, *data);
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return (err);
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}
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static device_method_t bcm_mbox_methods[] = {
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DEVMETHOD(device_probe, bcm_mbox_probe),
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DEVMETHOD(device_attach, bcm_mbox_attach),
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DEVMETHOD(mbox_read, bcm_mbox_read),
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DEVMETHOD(mbox_write, bcm_mbox_write),
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DEVMETHOD_END
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};
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static driver_t bcm_mbox_driver = {
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"mbox",
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bcm_mbox_methods,
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sizeof(struct bcm_mbox_softc),
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};
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static devclass_t bcm_mbox_devclass;
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DRIVER_MODULE(mbox, simplebus, bcm_mbox_driver, bcm_mbox_devclass, 0, 0);
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static void
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bcm2835_mbox_dma_cb(void *arg, bus_dma_segment_t *segs, int nseg, int err)
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{
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bus_addr_t *addr;
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if (err)
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return;
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addr = (bus_addr_t *)arg;
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*addr = ARMC_TO_VCBUS(segs[0].ds_addr);
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}
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static void *
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bcm2835_mbox_init_dma(device_t dev, size_t len, bus_dma_tag_t *tag,
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bus_dmamap_t *map, bus_addr_t *phys)
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{
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void *buf;
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int err;
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err = bus_dma_tag_create(bus_get_dma_tag(dev), 16, 0,
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bcm283x_dmabus_peripheral_lowaddr(), BUS_SPACE_MAXADDR, NULL, NULL,
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len, 1, len, 0, NULL, NULL, tag);
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if (err != 0) {
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device_printf(dev, "can't create DMA tag\n");
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return (NULL);
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}
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err = bus_dmamem_alloc(*tag, &buf, 0, map);
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if (err != 0) {
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bus_dma_tag_destroy(*tag);
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device_printf(dev, "can't allocate dmamem\n");
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return (NULL);
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}
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err = bus_dmamap_load(*tag, *map, buf, len, bcm2835_mbox_dma_cb,
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phys, 0);
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if (err != 0) {
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bus_dmamem_free(*tag, buf, *map);
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bus_dma_tag_destroy(*tag);
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device_printf(dev, "can't load DMA map\n");
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return (NULL);
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}
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return (buf);
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}
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static int
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bcm2835_mbox_err(device_t dev, bus_addr_t msg_phys, uint32_t resp_phys,
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struct bcm2835_mbox_hdr *msg, size_t len)
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{
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int idx;
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struct bcm2835_mbox_tag_hdr *tag;
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uint8_t *last;
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if ((uint32_t)msg_phys != resp_phys) {
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device_printf(dev, "response channel mismatch\n");
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return (EIO);
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}
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if (msg->code != BCM2835_MBOX_CODE_RESP_SUCCESS) {
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device_printf(dev, "mbox response error\n");
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return (EIO);
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}
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/* Loop until the end tag. */
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tag = (struct bcm2835_mbox_tag_hdr *)(msg + 1);
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last = (uint8_t *)msg + len;
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for (idx = 0; tag->tag != 0; idx++) {
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if ((tag->val_len & BCM2835_MBOX_TAG_VAL_LEN_RESPONSE) == 0) {
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device_printf(dev, "tag %d response error\n", idx);
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return (EIO);
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}
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/* Clear the response bit. */
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tag->val_len &= ~BCM2835_MBOX_TAG_VAL_LEN_RESPONSE;
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/* Next tag. */
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tag = (struct bcm2835_mbox_tag_hdr *)((uint8_t *)tag +
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sizeof(*tag) + tag->val_buf_size);
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if ((uint8_t *)tag > last) {
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device_printf(dev, "mbox buffer size error\n");
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return (EIO);
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}
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}
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return (0);
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}
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int
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bcm2835_mbox_property(void *msg, size_t msg_size)
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{
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struct bcm_mbox_softc *sc;
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struct msg_set_power_state *buf;
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bus_dma_tag_t msg_tag;
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bus_dmamap_t msg_map;
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bus_addr_t msg_phys;
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uint32_t reg;
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device_t mbox;
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int err;
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/* get mbox device */
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mbox = devclass_get_device(devclass_find("mbox"), 0);
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if (mbox == NULL)
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return (ENXIO);
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sc = device_get_softc(mbox);
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sx_xlock(&sc->property_chan_lock);
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/* Allocate memory for the message */
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buf = bcm2835_mbox_init_dma(mbox, msg_size, &msg_tag, &msg_map,
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&msg_phys);
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if (buf == NULL) {
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err = ENOMEM;
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goto out;
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}
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memcpy(buf, msg, msg_size);
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bus_dmamap_sync(msg_tag, msg_map,
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BUS_DMASYNC_PREWRITE);
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MBOX_WRITE(mbox, BCM2835_MBOX_CHAN_PROP, (uint32_t)msg_phys);
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MBOX_READ(mbox, BCM2835_MBOX_CHAN_PROP, ®);
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bus_dmamap_sync(msg_tag, msg_map,
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BUS_DMASYNC_PREREAD);
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memcpy(msg, buf, msg_size);
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err = bcm2835_mbox_err(mbox, msg_phys, reg,
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(struct bcm2835_mbox_hdr *)msg, msg_size);
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bus_dmamap_unload(msg_tag, msg_map);
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bus_dmamem_free(msg_tag, buf, msg_map);
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bus_dma_tag_destroy(msg_tag);
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out:
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sx_xunlock(&sc->property_chan_lock);
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return (err);
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}
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int
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bcm2835_mbox_set_power_state(uint32_t device_id, boolean_t on)
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{
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struct msg_set_power_state msg;
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int err;
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memset(&msg, 0, sizeof(msg));
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msg.hdr.buf_size = sizeof(msg);
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msg.hdr.code = BCM2835_MBOX_CODE_REQ;
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msg.tag_hdr.tag = BCM2835_MBOX_TAG_SET_POWER_STATE;
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msg.tag_hdr.val_buf_size = sizeof(msg.body);
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msg.tag_hdr.val_len = sizeof(msg.body.req);
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msg.body.req.device_id = device_id;
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msg.body.req.state = (on ? BCM2835_MBOX_POWER_ON : 0) |
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BCM2835_MBOX_POWER_WAIT;
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msg.end_tag = 0;
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err = bcm2835_mbox_property(&msg, sizeof(msg));
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return (err);
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}
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int
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bcm2835_mbox_get_clock_rate(uint32_t clock_id, uint32_t *hz)
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{
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struct msg_get_clock_rate msg;
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int err;
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memset(&msg, 0, sizeof(msg));
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msg.hdr.buf_size = sizeof(msg);
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msg.hdr.code = BCM2835_MBOX_CODE_REQ;
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msg.tag_hdr.tag = BCM2835_MBOX_TAG_GET_CLOCK_RATE;
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msg.tag_hdr.val_buf_size = sizeof(msg.body);
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msg.tag_hdr.val_len = sizeof(msg.body.req);
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msg.body.req.clock_id = clock_id;
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msg.end_tag = 0;
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err = bcm2835_mbox_property(&msg, sizeof(msg));
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*hz = msg.body.resp.rate_hz;
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return (err);
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}
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int
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bcm2835_mbox_fb_get_w_h(struct bcm2835_fb_config *fb)
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{
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int err;
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struct msg_fb_get_w_h msg;
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memset(&msg, 0, sizeof(msg));
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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);
|
|
}
|