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https://github.com/brain-hackers/u-boot-brain
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![Fabian Vogt](/assets/img/avatar_default.png)
Before we can send a message to the mailbox we have to check that there is space to do so. Therefore we poll the status register. But up to now the wrong status register, the one of mailbox 0, was checked. Fix this by polling the status regiser of mailbox 1. Signed-off-by: Fabian Vogt <fvogt@suse.com> Acked-by: Stephen Warren <swarren@wwwdotorg.org> [mb: rename registers and update commit message] Signed-off-by: Matthias Brugger <mbrugger@suse.com>
165 lines
3.4 KiB
C
165 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2012 Stephen Warren
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/arch/mbox.h>
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#include <phys2bus.h>
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#define TIMEOUT 1000 /* ms */
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int bcm2835_mbox_call_raw(u32 chan, u32 send, u32 *recv)
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{
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struct bcm2835_mbox_regs *regs =
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(struct bcm2835_mbox_regs *)BCM2835_MBOX_PHYSADDR;
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ulong endtime = get_timer(0) + TIMEOUT;
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u32 val;
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debug("time: %lu timeout: %lu\n", get_timer(0), endtime);
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if (send & BCM2835_CHAN_MASK) {
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printf("mbox: Illegal mbox data 0x%08x\n", send);
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return -1;
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}
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/* Drain any stale responses */
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for (;;) {
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val = readl(®s->mail0_status);
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if (val & BCM2835_MBOX_STATUS_RD_EMPTY)
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break;
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if (get_timer(0) >= endtime) {
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printf("mbox: Timeout draining stale responses\n");
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return -1;
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}
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val = readl(®s->read);
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}
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/* Wait for space to send */
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for (;;) {
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val = readl(®s->mail1_status);
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if (!(val & BCM2835_MBOX_STATUS_WR_FULL))
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break;
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if (get_timer(0) >= endtime) {
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printf("mbox: Timeout waiting for send space\n");
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return -1;
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}
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}
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/* Send the request */
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val = BCM2835_MBOX_PACK(chan, send);
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debug("mbox: TX raw: 0x%08x\n", val);
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writel(val, ®s->write);
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/* Wait for the response */
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for (;;) {
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val = readl(®s->mail0_status);
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if (!(val & BCM2835_MBOX_STATUS_RD_EMPTY))
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break;
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if (get_timer(0) >= endtime) {
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printf("mbox: Timeout waiting for response\n");
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return -1;
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}
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}
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/* Read the response */
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val = readl(®s->read);
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debug("mbox: RX raw: 0x%08x\n", val);
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/* Validate the response */
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if (BCM2835_MBOX_UNPACK_CHAN(val) != chan) {
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printf("mbox: Response channel mismatch\n");
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return -1;
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}
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*recv = BCM2835_MBOX_UNPACK_DATA(val);
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return 0;
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}
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#ifdef DEBUG
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void dump_buf(struct bcm2835_mbox_hdr *buffer)
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{
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u32 *p;
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u32 words;
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int i;
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p = (u32 *)buffer;
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words = buffer->buf_size / 4;
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for (i = 0; i < words; i++)
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printf(" 0x%04x: 0x%08x\n", i * 4, p[i]);
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}
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#endif
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int bcm2835_mbox_call_prop(u32 chan, struct bcm2835_mbox_hdr *buffer)
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{
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int ret;
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u32 rbuffer;
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struct bcm2835_mbox_tag_hdr *tag;
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int tag_index;
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#ifdef DEBUG
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printf("mbox: TX buffer\n");
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dump_buf(buffer);
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#endif
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flush_dcache_range((unsigned long)buffer,
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(unsigned long)((void *)buffer +
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roundup(buffer->buf_size, ARCH_DMA_MINALIGN)));
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ret = bcm2835_mbox_call_raw(chan,
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phys_to_bus((unsigned long)buffer),
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&rbuffer);
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if (ret)
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return ret;
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invalidate_dcache_range((unsigned long)buffer,
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(unsigned long)((void *)buffer +
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roundup(buffer->buf_size, ARCH_DMA_MINALIGN)));
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if (rbuffer != phys_to_bus((unsigned long)buffer)) {
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printf("mbox: Response buffer mismatch\n");
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return -1;
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}
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#ifdef DEBUG
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printf("mbox: RX buffer\n");
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dump_buf(buffer);
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#endif
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/* Validate overall response status */
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if (buffer->code != BCM2835_MBOX_RESP_CODE_SUCCESS) {
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printf("mbox: Header response code invalid\n");
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return -1;
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}
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/* Validate each tag's response status */
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tag = (void *)(buffer + 1);
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tag_index = 0;
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while (tag->tag) {
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if (!(tag->val_len & BCM2835_MBOX_TAG_VAL_LEN_RESPONSE)) {
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printf("mbox: Tag %d missing val_len response bit\n",
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tag_index);
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return -1;
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}
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/*
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* Clear the reponse bit so clients can just look right at the
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* length field without extra processing
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*/
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tag->val_len &= ~BCM2835_MBOX_TAG_VAL_LEN_RESPONSE;
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tag = (void *)(((u8 *)tag) + sizeof(*tag) + tag->val_buf_size);
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tag_index++;
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}
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return 0;
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}
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