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rpi: fix revision scheme parsing

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The RPi has two different schemes for encoding board revision values.
When adding RPi 2 support, I thought that the conflicting type field
values were to be interpreted based on bcm2835-vs-bcm2836. In fact, the
scheme bit determines the encoding. The RPi Zero uses the bcm2835 yet
uses the new encoding scheme. Fix the code to cater for this correctly.

Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
This commit is contained in:
Stephen Warren 2015-12-04 22:07:45 -07:00 • committed by Tom Rini
parent dbe6f1eb93
commit c4ea1edb70
1 changed files with 53 additions and 34 deletions
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87
board/raspberrypi/rpi/rpi.c
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@ -77,29 +77,33 @@ struct msg_get_clock_rate {
/*
* http://raspberryalphaomega.org.uk/2013/02/06/automatic-raspberry-pi-board-revision-detection-model-a-b1-and-b2/
* http://www.raspberrypi.org/forums/viewtopic.php?f=63&t=32733
* http://git.drogon.net/?p=wiringPi;a=blob_plain;f=wiringPi/wiringPi.c;hb=5edd177112c99416f68ba3e8c6c4db6ed942e796
* http://git.drogon.net/?p=wiringPi;a=blob;f=wiringPi/wiringPi.c;h=503151f61014418b9c42f4476a6086f75cd4e64b;hb=refs/heads/master#l922
*/
static const struct {
struct rpi_model {
const char *name;
const char *fdtfile;
bool has_onboard_eth;
} models[] = {
[0] = {
"Unknown model",
};
static const struct rpi_model rpi_model_unknown = {
"Unknown model",
#ifdef CONFIG_BCM2836
"bcm2836-rpi-other.dtb",
"bcm2836-rpi-other.dtb",
#else
"bcm2835-rpi-other.dtb",
"bcm2835-rpi-other.dtb",
#endif
false,
},
#ifdef CONFIG_BCM2836
false,
};
static const struct rpi_model rpi_models_new_scheme[] = {
[0x4] = {
"2 Model B",
"bcm2836-rpi-2-b.dtb",
true,
},
#else
};
static const struct rpi_model rpi_models_old_scheme[] = {
[0x2] = {
"Model B (no P5)",
"bcm2835-rpi-b-i2c0.dtb",
@ -185,10 +189,12 @@ static const struct {
"bcm2835-rpi-a-plus.dtb",
false,
},
#endif
};
u32 rpi_board_rev = 0;
static uint32_t revision;
static uint32_t rev_scheme;
static uint32_t rev_type;
static const struct rpi_model *model;
int dram_init(void)
{
@ -216,7 +222,7 @@ static void set_fdtfile(void)
if (getenv("fdtfile"))
return;
fdtfile = models[rpi_board_rev].fdtfile;
fdtfile = model->fdtfile;
setenv("fdtfile", fdtfile);
}
@ -225,7 +231,7 @@ static void set_usbethaddr(void)
ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_mac_address, msg, 1);
int ret;
if (!models[rpi_board_rev].has_onboard_eth)
if (!model->has_onboard_eth)
return;
if (getenv("usbethaddr"))
@ -249,10 +255,16 @@ static void set_usbethaddr(void)
#ifdef CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
static void set_board_info(void)
{
char str_rev[11];
sprintf(str_rev, "0x%X", rpi_board_rev);
setenv("board_rev", str_rev);
setenv("board_name", models[rpi_board_rev].name);
char s[11];
snprintf(s, sizeof(s), "0x%X", revision);
setenv("board_revision", s);
snprintf(s, sizeof(s), "%d", rev_scheme);
setenv("board_rev_scheme", s);
/* Can't rename this to board_rev_type since it's an ABI for scripts */
snprintf(s, sizeof(s), "0x%X", rev_type);
setenv("board_rev", s);
setenv("board_name", model->name);
}
#endif /* CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG */
@ -294,7 +306,8 @@ static void get_board_rev(void)
{
ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_board_rev, msg, 1);
int ret;
const char *name;
const struct rpi_model *models;
uint32_t models_count;
BCM2835_MBOX_INIT_HDR(msg);
BCM2835_MBOX_INIT_TAG(&msg->get_board_rev, GET_BOARD_REV);
@ -317,23 +330,29 @@ static void get_board_rev(void)
* http://www.raspberrypi.org/forums/viewtopic.php?f=63&t=98367&start=250
* http://www.raspberrypi.org/forums/viewtopic.php?f=31&t=20594
*/
rpi_board_rev = msg->get_board_rev.body.resp.rev;
if (rpi_board_rev & 0x800000)
rpi_board_rev = (rpi_board_rev >> 4) & 0xff;
else
rpi_board_rev &= 0xff;
if (rpi_board_rev >= ARRAY_SIZE(models)) {
printf("RPI: Board rev %u outside known range\n",
rpi_board_rev);
rpi_board_rev = 0;
revision = msg->get_board_rev.body.resp.rev;
if (revision & 0x800000) {
rev_scheme = 1;
rev_type = (revision >> 4) & 0xff;
models = rpi_models_new_scheme;
models_count = ARRAY_SIZE(rpi_models_new_scheme);
} else {
rev_scheme = 0;
rev_type = revision & 0xff;
models = rpi_models_old_scheme;
models_count = ARRAY_SIZE(rpi_models_old_scheme);
}
if (!models[rpi_board_rev].name) {
printf("RPI: Board rev %u unknown\n", rpi_board_rev);
rpi_board_rev = 0;
if (rev_type >= models_count) {
printf("RPI: Board rev 0x%x outside known range\n", rev_type);
model = &rpi_model_unknown;
} else if (!models[rev_type].name) {
printf("RPI: Board rev 0x%x unknown\n", rev_type);
model = &rpi_model_unknown;
} else {
model = &models[rev_type];
}
name = models[rpi_board_rev].name;
printf("RPI %s\n", name);
printf("RPI %s (0x%x)\n", model->name, revision);
}
int board_init(void)