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https://github.com/brain-hackers/u-boot-brain
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![Tom Rini](/assets/img/avatar_default.png)
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.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->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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