109 lines
3 KiB
C
109 lines
3 KiB
C
//
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// cpu over/underclock (based on code from eggs)
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//
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdint.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <limits.h>
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#include <errno.h>
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// -- 0xe64e v 1000000 : 700000 + (25000x12) / 0x0c 01100 1110[01100]1001110
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// - 0xe6ce v 1025000 : 700000 + (25000x13) / 0x0d 01101 1110[01101]1001110
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// 0xe84e v 1100000 : 700000 + (25000x16) / 0x10 10000 1110[10000]1001110
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// + 0xebce v 1275000 : 700000 + (25000x23) / 0x17 10111 1110[10111]1001110
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// ++ 0xedce v 1375000 : 700000 + (25000x27) / 0x1b 11011 1110[11011]1001110
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#define VOLTMIN (700000)
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#define VOLTMAX (1400000)
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#define VOLTMUL (25000)
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void setcpuvolt(int volt) {
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if (volt < VOLTMIN) volt = VOLTMIN;
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else if (volt > VOLTMAX) volt = VOLTMAX;
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volt = ((volt-VOLTMIN) / VOLTMUL)<<7;
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char str[16];
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sprintf(str, "11=%04x", 0xe04e | volt);
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int fd_reg = open("/sys/class/i2c-adapter/i2c-1/1-0065/reg_dbg", O_WRONLY);
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write(fd_reg, str, strlen(str));
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close(fd_reg);
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}
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#define CMU_BASE (0xB0160000)
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#define CLKMIN (192000)
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#define CLKMAX (1524000)
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#define CLKMUL (12000)
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void setcpuclock(int clock) {
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if (clock < CLKMIN) clock = CLKMIN;
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else if (clock > CLKMAX) clock = CLKMAX;
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clock = clock / CLKMUL;
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int fd_mem = open("/dev/mem", O_RDWR);
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uint32_t* cmu_mem = mmap(0, 4, PROT_READ|PROT_WRITE, MAP_SHARED, fd_mem, CMU_BASE);
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cmu_mem[0] = (cmu_mem[0] & 0xFFFFFF80) | clock;
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munmap(cmu_mem, 4);
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close(fd_mem);
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}
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void setcpu(int clock, int volt) {
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setcpuvolt(VOLTMAX); // Temporarily maximize
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setcpuclock(clock);
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setcpuvolt(volt);
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}
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// clk 240000 volt 975000
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// clk 504000 volt 1000000
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// clk 720000 volt 1025000
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// clk 1008000 volt 1100000
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// clk 1296000 volt 1275000
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// clk 1488000 volt 1375000
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static struct cpu_opp {
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int clk;
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int volt;
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char* desc;
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} cpu_opps[] = {
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{1488000, 1375000}, // 1.5GHz, MinUI Performance + launch
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{1392000, 1325000}, // 1.4GHz
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{1296000, 1275000}, // 1.3GHz, MinUI Normal
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{1200000, 1200000}, // 1.2GHz
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{1104000, 1175000}, // 1.1GHz, MinUI Powersave
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{1008000, 1100000}, // 1.0GHz, Anbernic default max, overvolted to stabilize
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{ 840000, 1075000}, // 840MHz, overvolted to stabilize
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{ 720000, 1025000}, // 720MHz, overvolted to stabilize
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{ 504000, 1000000}, // 500MHz, overvolted to stabilize, MinUI menus
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{ 240000, 975000}, // 240MHz, overvolted to stabilize
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{ 0, 0},
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};
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int main(int argc, char* argv[]) {
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if (argc<2) {
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printf("Usage: %s <freq>\n", argv[0]);
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for (int i=0; cpu_opps[i].clk; i++) {
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printf(" %8i\n", cpu_opps[i].clk);
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}
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return 0;
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}
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int clk = 1008000; // default
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char *p;
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errno = 0;
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long arg = strtol(argv[1], &p, 10);
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if (errno != 0 || *p != '\0' || arg > INT_MAX || arg < INT_MIN); // buh
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else clk = arg;
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for (int i=0; cpu_opps[i].clk; i++) {
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struct cpu_opp* cpu = &cpu_opps[i];
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if (clk>=cpu->clk) {
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setcpu( cpu->clk, cpu->volt );
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char cmd[128];
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sprintf(cmd, "echo %i > /tmp/cpu_freq\n", cpu->clk);
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system(cmd);
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break;
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}
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}
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return 0;
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}
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