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+-- Forum: ROCK64 (https://forum.pine64.org/forumdisplay.php?fid=85)
+--- Forum: Linux on Rock64 (https://forum.pine64.org/forumdisplay.php?fid=88)
+--- Thread: What is name of gpio hardware on a rock64? (/showthread.php?tid=5211)
What is name of gpio hardware on a rock64? - gene83 - 10-04-2017
The driver code checks for it, and will return a valid answer if its a bcm2709, bcm2835, bcm2836, or a bcm2837. Code is:
Code:
#define CPUINFO_BUFSIZE (16*1024) // Should be large enough for now
static platform_t check_platform(void)
{
FILE *fp;
char *buf;
size_t fsize;
platform_t rv = RPI_UNSUPPORTED;
if(!(buf = rtapi_kmalloc(CPUINFO_BUFSIZE, RTAPI_GFP_KERNEL))) {
rtapi_print_msg(RPSPI_ERR, "hm2_rpspi: No dynamic memory\n");
return RPI_UNSUPPORTED;
}
if(!(fp = fopen("/proc/cpuinfo", "r"))) {
rtapi_print_msg(RPSPI_ERR, "hm2_rpspi: Failed to open /proc/cpuinfo\n");
goto check_exit;
}
fsize = fread(buf, 1, CPUINFO_BUFSIZE - 1, fp);
fclose(fp);
// we have truncated cpuinfo return unsupported
if(!fsize || fsize == CPUINFO_BUFSIZE - 1) {
rtapi_print_msg(RPSPI_ERR, "hm2_rpspi: Platform detection memory buffer too small\n");
goto check_exit;
}
/* NUL terminate the buffer */
buf[fsize] = '\0';
if(strstr(buf, "BCM2708")) {
rv = RPI_1;
} else if(strstr(buf, "BCM2709")) {
rv = RPI_2; //for RPI 3 too
} else if(strstr(buf, "BCM2835")) { // starting with 4.8 kernels revision tag has board details
char *rev_val = strstr(buf, "Revision");
if(rev_val) {
char *rev_start = strstr(rev_val, ": ");
unsigned long rev = strtol(rev_start + 2, NULL, 16);
if(rev <= 0xffff)
rv = RPI_1; // pre pi2 revision scheme
else {
switch((rev & 0xf000) >> 12) {
case 0: //bcm2835
rv = RPI_1;
break;
case 1: //bcm2836
case 2: //bcm2837
rv = RPI_2; // peripheral base is same on pi2/3
break;
default:
break;
}
}
}
}
check_exit:
rtapi_kfree(buf);
return rv;
}
And all the c style indenting has been stripped, so how do I post code? This sucks.Thanks everybody.
Cheers, Gene83
RE: What is name of gpio hardware on a rock64? - dkryder - 10-04-2017
gpio is a function of the soc [rockchip 3328]
RE: What is name of gpio hardware on a rock64? - gene83 - 10-04-2017
Thank you very much.
Cheers, gene83
RE: What is name of gpio hardware on a rock64? - martinayotte - 10-04-2017
If you wish to verify that /proc/cpuinfo contains the board model, you better verify that first, because in some kernels, the name won't appear.
Some other way to do that is to verify /proc/device-tree/model ...
RE: What is name of gpio hardware on a rock64? - gene83 - 10-04-2017
The only place I can find that is in /proc/device-tree/spi@ff190000 and that isn't explicit.
There are rockchip, and rk3328's scattered here and there but I've no clue how volatile they may be. But they I think hold the most promise, but it a whole new kilobyte of prelude code to get there, and I haven't hacked on c code in 25 years. Complicated by my wet ram turning 83 yo today.
Cheers & thanks, martinayotte
Gene83
RE: What is name of gpio hardware on a rock64? - martinayotte - 10-05-2017
On my board, doing "cat /proc/device-tree/model" returns "PINE64 ROCK64".
RE: What is name of gpio hardware on a rock64? - gene83 - 10-05-2017
Whereas I get:Rockchip RK3328 Rock64
Without an eof or eol. And which would appear to be a valid ID.
Thanks. Not working on the code yet, morning here and I'm still a quart low on coffee. :-)
Cheers martinayotte, gene83