155 lines
3.1 KiB
C
155 lines
3.1 KiB
C
/*
|
|
* (C) Copyright 2012 Stephen Warren
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <asm/io.h>
|
|
#include <asm/arch/mbox.h>
|
|
#include <phys2bus.h>
|
|
|
|
#define TIMEOUT 1000 /* ms */
|
|
|
|
int bcm2835_mbox_call_raw(u32 chan, u32 send, u32 *recv)
|
|
{
|
|
struct bcm2835_mbox_regs *regs =
|
|
(struct bcm2835_mbox_regs *)BCM2835_MBOX_PHYSADDR;
|
|
ulong endtime = get_timer(0) + TIMEOUT;
|
|
u32 val;
|
|
|
|
debug("time: %lu timeout: %lu\n", get_timer(0), endtime);
|
|
|
|
if (send & BCM2835_CHAN_MASK) {
|
|
printf("mbox: Illegal mbox data 0x%08x\n", send);
|
|
return -1;
|
|
}
|
|
|
|
/* Drain any stale responses */
|
|
|
|
for (;;) {
|
|
val = readl(®s->status);
|
|
if (val & BCM2835_MBOX_STATUS_RD_EMPTY)
|
|
break;
|
|
if (get_timer(0) >= endtime) {
|
|
printf("mbox: Timeout draining stale responses\n");
|
|
return -1;
|
|
}
|
|
val = readl(®s->read);
|
|
}
|
|
|
|
/* Wait for space to send */
|
|
|
|
for (;;) {
|
|
val = readl(®s->status);
|
|
if (!(val & BCM2835_MBOX_STATUS_WR_FULL))
|
|
break;
|
|
if (get_timer(0) >= endtime) {
|
|
printf("mbox: Timeout waiting for send space\n");
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/* Send the request */
|
|
|
|
val = BCM2835_MBOX_PACK(chan, send);
|
|
debug("mbox: TX raw: 0x%08x\n", val);
|
|
writel(val, ®s->write);
|
|
|
|
/* Wait for the response */
|
|
|
|
for (;;) {
|
|
val = readl(®s->status);
|
|
if (!(val & BCM2835_MBOX_STATUS_RD_EMPTY))
|
|
break;
|
|
if (get_timer(0) >= endtime) {
|
|
printf("mbox: Timeout waiting for response\n");
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/* Read the response */
|
|
|
|
val = readl(®s->read);
|
|
debug("mbox: RX raw: 0x%08x\n", val);
|
|
|
|
/* Validate the response */
|
|
|
|
if (BCM2835_MBOX_UNPACK_CHAN(val) != chan) {
|
|
printf("mbox: Response channel mismatch\n");
|
|
return -1;
|
|
}
|
|
|
|
*recv = BCM2835_MBOX_UNPACK_DATA(val);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
void dump_buf(struct bcm2835_mbox_hdr *buffer)
|
|
{
|
|
u32 *p;
|
|
u32 words;
|
|
int i;
|
|
|
|
p = (u32 *)buffer;
|
|
words = buffer->buf_size / 4;
|
|
for (i = 0; i < words; i++)
|
|
printf(" 0x%04x: 0x%08x\n", i * 4, p[i]);
|
|
}
|
|
#endif
|
|
|
|
int bcm2835_mbox_call_prop(u32 chan, struct bcm2835_mbox_hdr *buffer)
|
|
{
|
|
int ret;
|
|
u32 rbuffer;
|
|
struct bcm2835_mbox_tag_hdr *tag;
|
|
int tag_index;
|
|
|
|
#ifdef DEBUG
|
|
printf("mbox: TX buffer\n");
|
|
dump_buf(buffer);
|
|
#endif
|
|
|
|
ret = bcm2835_mbox_call_raw(chan, phys_to_bus((u32)buffer), &rbuffer);
|
|
if (ret)
|
|
return ret;
|
|
if (rbuffer != phys_to_bus((u32)buffer)) {
|
|
printf("mbox: Response buffer mismatch\n");
|
|
return -1;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
printf("mbox: RX buffer\n");
|
|
dump_buf(buffer);
|
|
#endif
|
|
|
|
/* Validate overall response status */
|
|
|
|
if (buffer->code != BCM2835_MBOX_RESP_CODE_SUCCESS) {
|
|
printf("mbox: Header response code invalid\n");
|
|
return -1;
|
|
}
|
|
|
|
/* Validate each tag's response status */
|
|
|
|
tag = (void *)(buffer + 1);
|
|
tag_index = 0;
|
|
while (tag->tag) {
|
|
if (!(tag->val_len & BCM2835_MBOX_TAG_VAL_LEN_RESPONSE)) {
|
|
printf("mbox: Tag %d missing val_len response bit\n",
|
|
tag_index);
|
|
return -1;
|
|
}
|
|
/*
|
|
* Clear the reponse bit so clients can just look right at the
|
|
* length field without extra processing
|
|
*/
|
|
tag->val_len &= ~BCM2835_MBOX_TAG_VAL_LEN_RESPONSE;
|
|
tag = (void *)(((u8 *)tag) + sizeof(*tag) + tag->val_buf_size);
|
|
tag_index++;
|
|
}
|
|
|
|
return 0;
|
|
}
|