e359dc24d3
Analog Devices' SigmaStudio can produce firmware blobs for devices with these DSPs embedded (like some audio codecs). Allow these device drivers to easily parse and load them. Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
116 lines
2.5 KiB
C
116 lines
2.5 KiB
C
/*
|
|
* Load Analog Devices SigmaStudio firmware files
|
|
*
|
|
* Copyright 2009-2011 Analog Devices Inc.
|
|
*
|
|
* Licensed under the GPL-2 or later.
|
|
*/
|
|
|
|
#include <linux/crc32.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/firmware.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/sigma.h>
|
|
|
|
/* Return: 0==OK, <0==error, =1 ==no more actions */
|
|
static int
|
|
process_sigma_action(struct i2c_client *client, struct sigma_firmware *ssfw)
|
|
{
|
|
struct sigma_action *sa = (void *)(ssfw->fw->data + ssfw->pos);
|
|
size_t len = sigma_action_len(sa);
|
|
int ret = 0;
|
|
|
|
pr_debug("%s: instr:%i addr:%#x len:%zu\n", __func__,
|
|
sa->instr, sa->addr, len);
|
|
|
|
switch (sa->instr) {
|
|
case SIGMA_ACTION_WRITEXBYTES:
|
|
case SIGMA_ACTION_WRITESINGLE:
|
|
case SIGMA_ACTION_WRITESAFELOAD:
|
|
if (ssfw->fw->size < ssfw->pos + len)
|
|
return -EINVAL;
|
|
ret = i2c_master_send(client, (void *)&sa->addr, len);
|
|
if (ret < 0)
|
|
return -EINVAL;
|
|
break;
|
|
|
|
case SIGMA_ACTION_DELAY:
|
|
ret = 0;
|
|
udelay(len);
|
|
len = 0;
|
|
break;
|
|
|
|
case SIGMA_ACTION_END:
|
|
return 1;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* when arrive here ret=0 or sent data */
|
|
ssfw->pos += sigma_action_size(sa, len);
|
|
return ssfw->pos == ssfw->fw->size;
|
|
}
|
|
|
|
static int
|
|
process_sigma_actions(struct i2c_client *client, struct sigma_firmware *ssfw)
|
|
{
|
|
pr_debug("%s: processing %p\n", __func__, ssfw);
|
|
|
|
while (1) {
|
|
int ret = process_sigma_action(client, ssfw);
|
|
pr_debug("%s: action returned %i\n", __func__, ret);
|
|
if (ret == 1)
|
|
return 0;
|
|
else if (ret)
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
int process_sigma_firmware(struct i2c_client *client, const char *name)
|
|
{
|
|
int ret;
|
|
struct sigma_firmware_header *ssfw_head;
|
|
struct sigma_firmware ssfw;
|
|
const struct firmware *fw;
|
|
u32 crc;
|
|
|
|
pr_debug("%s: loading firmware %s\n", __func__, name);
|
|
|
|
/* first load the blob */
|
|
ret = request_firmware(&fw, name, &client->dev);
|
|
if (ret) {
|
|
pr_debug("%s: request_firmware() failed with %i\n", __func__, ret);
|
|
return ret;
|
|
}
|
|
ssfw.fw = fw;
|
|
|
|
/* then verify the header */
|
|
ret = -EINVAL;
|
|
if (fw->size < sizeof(*ssfw_head))
|
|
goto done;
|
|
|
|
ssfw_head = (void *)fw->data;
|
|
if (memcmp(ssfw_head->magic, SIGMA_MAGIC, ARRAY_SIZE(ssfw_head->magic)))
|
|
goto done;
|
|
|
|
crc = crc32(0, fw->data, fw->size);
|
|
pr_debug("%s: crc=%x\n", __func__, crc);
|
|
if (crc != ssfw_head->crc)
|
|
goto done;
|
|
|
|
ssfw.pos = sizeof(*ssfw_head);
|
|
|
|
/* finally process all of the actions */
|
|
ret = process_sigma_actions(client, &ssfw);
|
|
|
|
done:
|
|
release_firmware(fw);
|
|
|
|
pr_debug("%s: loaded %s\n", __func__, name);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(process_sigma_firmware);
|