What is name of gpio hardware on a rock64?
#1
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
  Reply


Messages In This Thread
What is name of gpio hardware on a rock64? - by gene83 - 10-04-2017, 12:04 PM

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