164 lines
3.4 KiB
C
164 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->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->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->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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