added overclock.elf

src/overclock/overclock.c

@@ -0,0 +1,112 @@
+//
+//	cpu over/underclock (based on code from eggs)
+//
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <limits.h>
+#include <errno.h>
+
+//	-- 0xe64e v 1000000 : 700000 + (25000x12) / 0x0c 01100 1110[01100]1001110
+//	-  0xe6ce v 1025000 : 700000 + (25000x13) / 0x0d 01101 1110[01101]1001110
+//	   0xe84e v 1100000 : 700000 + (25000x16) / 0x10 10000 1110[10000]1001110
+//	+  0xebce v 1275000 : 700000 + (25000x23) / 0x17 10111 1110[10111]1001110
+//	++ 0xedce v 1375000 : 700000 + (25000x27) / 0x1b 11011 1110[11011]1001110
+#define	VOLTMIN	(700000)
+#define	VOLTMAX	(1400000)
+#define	VOLTMUL	(25000)
+void setcpuvolt(int volt) {
+	if (volt < VOLTMIN) volt = VOLTMIN;
+	else if (volt > VOLTMAX) volt = VOLTMAX;
+	volt = ((volt-VOLTMIN) / VOLTMUL)<<7;
+
+	char str[16];
+	sprintf(str, "11=%04x", 0xe04e | volt);
+	int fd_reg = open("/sys/class/i2c-adapter/i2c-1/1-0065/reg_dbg", O_WRONLY);
+	write(fd_reg, str, strlen(str));
+	close(fd_reg);
+}
+
+#define CMU_BASE	(0xB0160000)
+#define	CLKMIN		(192000)
+#define	CLKMAX		(1524000)
+#define	CLKMUL		(12000)
+void setcpuclock(int clock) {
+	if (clock < CLKMIN) clock = CLKMIN;
+	else if (clock > CLKMAX) clock = CLKMAX;
+	clock = clock / CLKMUL;
+
+	int fd_mem = open("/dev/mem", O_RDWR);
+	uint32_t* cmu_mem = mmap(0, 4, PROT_READ|PROT_WRITE, MAP_SHARED, fd_mem, CMU_BASE);
+	cmu_mem[0] = (cmu_mem[0] & 0xFFFFFF80) | clock;
+	munmap(cmu_mem, 4);
+	close(fd_mem);
+}
+
+void setcpu(int clock, int volt) {
+	setcpuvolt(VOLTMAX);	// Temporarily maximize
+	setcpuclock(clock);
+	setcpuvolt(volt);
+}
+
+// clk  240000 volt  975000
+// clk  504000 volt 1000000
+// clk  720000 volt 1025000
+// clk 1008000 volt 1100000
+// clk 1296000 volt 1275000
+// clk 1488000 volt 1375000
+
+static struct cpu_opp {
+	int clk;
+	int volt;
+	char* desc;
+} cpu_opps[] = {
+	{ CLKMAX, VOLTMAX}, // just a smidge above 1.5GHz
+	{1488000, 1375000}, // 1.5GHz, MinUI Performance + launch
+	{1392000, 1325000}, // 1.4GHz
+	{1296000, 1275000}, // 1.3GHz, MinUI Normal
+	{1200000, 1200000}, // 1.2GHz
+	{1104000, 1175000}, // 1.1GHz, MinUI Powersave
+	{1008000, 1100000}, // 1.0GHz, Anbernic default max, overvolted to stabilize
+	{ 840000, 1075000}, // 840MHz, overvolted to stabilize
+	{ 720000, 1025000}, // 720MHz, overvolted to stabilize
+	{ 504000, 1000000}, // 500MHz, overvolted to stabilize, MinUI Menus
+	{ 240000,  975000}, // 240MHz, overvolted to stabilize
+	{      0,       0},
+};
+
+int main(int argc, char* argv[]) {
+	if (argc<2) {
+		printf("Usage: %s <freq>\n", argv[0]);
+		for (int i=0; cpu_opps[i].clk; i++) {
+			printf("  %8i\n", cpu_opps[i].clk);
+		}
+		return 0;
+	}
+	
+	int clk = 1008000; // default
+	char *p;
+    errno = 0;
+    long arg = strtol(argv[1], &p, 10);
+	
+	if (errno != 0 || *p != '\0' || arg > INT_MAX || arg < INT_MIN); // buh
+	else clk = arg;
+	
+	for (int i=0; cpu_opps[i].clk; i++) {
+		struct cpu_opp* cpu = &cpu_opps[i];
+		if (clk>=cpu->clk) {
+			setcpu( cpu->clk, cpu->volt );
+			// TODO: this doesn't work...
+			// char cmd[128];
+			// sprintf(cmd, "echo %i > /tmp/cpu_freq", cpu->clk);
+			// puts(cmd);
+			// system(cmd);
+			break;
+		}
+	}
+	return 0;
+}