| 1 | /* |
| 2 | * (C) GraÅžvydas "notaz" Ignotas, 2009-2010 |
| 3 | * |
| 4 | * This work is licensed under the terms of any of these licenses |
| 5 | * (at your option): |
| 6 | * - GNU GPL, version 2 or later. |
| 7 | * - GNU LGPL, version 2.1 or later. |
| 8 | * - MAME license. |
| 9 | * See the COPYING file in the top-level directory. |
| 10 | * |
| 11 | * <random_info=mem_map> |
| 12 | * 00000000-029fffff linux (42MB) |
| 13 | * 02a00000-02dfffff fb (4MB, 153600B really used) |
| 14 | * 02e00000-02ffffff sound dma (2MB) |
| 15 | * 03000000-03ffffff MPEGDEC (?, 16MB) |
| 16 | * </random_info> |
| 17 | */ |
| 18 | |
| 19 | #include <stdio.h> |
| 20 | #include <stdlib.h> |
| 21 | #include <string.h> |
| 22 | #include <sys/types.h> |
| 23 | #include <sys/stat.h> |
| 24 | #include <fcntl.h> |
| 25 | #include <sys/mman.h> |
| 26 | #include <unistd.h> |
| 27 | #include <sys/ioctl.h> |
| 28 | #include <linux/soundcard.h> |
| 29 | |
| 30 | #include "soc.h" |
| 31 | #include "plat_gp2x.h" |
| 32 | #include "../plat.h" |
| 33 | |
| 34 | static int battdev = -1, mixerdev = -1; |
| 35 | static int cpu_clock_allowed; |
| 36 | static unsigned int saved_video_regs[2][6]; |
| 37 | static unsigned int timer_drift; // count per real second |
| 38 | |
| 39 | #ifndef ARRAY_SIZE |
| 40 | #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0])) |
| 41 | #endif |
| 42 | |
| 43 | /* note: both PLLs are programmed the same way, |
| 44 | * the databook incorrectly states that PLL1 differs */ |
| 45 | static int decode_pll(unsigned int reg) |
| 46 | { |
| 47 | long long v; |
| 48 | int p, m, s; |
| 49 | |
| 50 | p = (reg >> 18) & 0x3f; |
| 51 | m = (reg >> 8) & 0x3ff; |
| 52 | s = reg & 0xff; |
| 53 | |
| 54 | if (p == 0) |
| 55 | p = 1; |
| 56 | |
| 57 | v = 27000000; // master clock |
| 58 | v = v * m / (p << s); |
| 59 | return v; |
| 60 | } |
| 61 | |
| 62 | #define TIMER_BASE3 0x1980 |
| 63 | #define TIMER_REG(x) memregl[(TIMER_BASE3 + x) >> 2] |
| 64 | |
| 65 | static unsigned int gp2x_get_ticks_us_(void) |
| 66 | { |
| 67 | TIMER_REG(0x08) = 0x4b; /* run timer, latch value */ |
| 68 | return TIMER_REG(0); |
| 69 | } |
| 70 | |
| 71 | static unsigned int gp2x_get_ticks_ms_(void) |
| 72 | { |
| 73 | /* approximate /= 1000 */ |
| 74 | unsigned long long v64; |
| 75 | v64 = (unsigned long long)gp2x_get_ticks_us_() * 4294968; |
| 76 | return v64 >> 32; |
| 77 | } |
| 78 | |
| 79 | static void timer_cleanup(void) |
| 80 | { |
| 81 | TIMER_REG(0x40) = 0x0c; /* be sure clocks are on */ |
| 82 | TIMER_REG(0x08) = 0x23; /* stop the timer, clear irq in case it's pending */ |
| 83 | TIMER_REG(0x00) = 0; /* clear counter */ |
| 84 | TIMER_REG(0x40) = 0; /* clocks off */ |
| 85 | TIMER_REG(0x44) = 0; /* dividers back to default */ |
| 86 | } |
| 87 | |
| 88 | static void save_multiple_regs(unsigned int *dest, int base, int count) |
| 89 | { |
| 90 | const volatile unsigned int *regs = memregl + base / 4; |
| 91 | int i; |
| 92 | |
| 93 | for (i = 0; i < count; i++) |
| 94 | dest[i] = regs[i]; |
| 95 | } |
| 96 | |
| 97 | static void restore_multiple_regs(int base, const unsigned int *src, int count) |
| 98 | { |
| 99 | volatile unsigned int *regs = memregl + base / 4; |
| 100 | int i; |
| 101 | |
| 102 | for (i = 0; i < count; i++) |
| 103 | regs[i] = src[i]; |
| 104 | } |
| 105 | |
| 106 | int pollux_get_real_snd_rate(int req_rate) |
| 107 | { |
| 108 | int clk0_src, clk1_src, rate, div; |
| 109 | |
| 110 | clk0_src = (memregl[0xdbc4>>2] >> 1) & 7; |
| 111 | clk1_src = (memregl[0xdbc8>>2] >> 1) & 7; |
| 112 | if (clk0_src > 1 || clk1_src != 7) { |
| 113 | fprintf(stderr, "get_real_snd_rate: bad clk sources: %d %d\n", clk0_src, clk1_src); |
| 114 | return req_rate; |
| 115 | } |
| 116 | |
| 117 | rate = decode_pll(clk0_src ? memregl[0xf008>>2] : memregl[0xf004>>2]); |
| 118 | |
| 119 | // apply divisors |
| 120 | div = ((memregl[0xdbc4>>2] >> 4) & 0x3f) + 1; |
| 121 | rate /= div; |
| 122 | div = ((memregl[0xdbc8>>2] >> 4) & 0x3f) + 1; |
| 123 | rate /= div; |
| 124 | rate /= 64; |
| 125 | |
| 126 | //printf("rate %d\n", rate); |
| 127 | rate -= rate * timer_drift / 1000000; |
| 128 | printf("adjusted rate: %d\n", rate); |
| 129 | |
| 130 | if (rate < 8000-1000 || rate > 44100+1000) { |
| 131 | fprintf(stderr, "get_real_snd_rate: got bad rate: %d\n", rate); |
| 132 | return req_rate; |
| 133 | } |
| 134 | |
| 135 | return rate; |
| 136 | } |
| 137 | |
| 138 | /* newer API */ |
| 139 | static int pollux_cpu_clock_get(void) |
| 140 | { |
| 141 | return decode_pll(memregl[0xf004>>2]) / 1000000; |
| 142 | } |
| 143 | |
| 144 | int pollux_cpu_clock_set(int mhz) |
| 145 | { |
| 146 | int adiv, mdiv, pdiv, sdiv = 0; |
| 147 | int i, vf000, vf004; |
| 148 | |
| 149 | if (!cpu_clock_allowed) |
| 150 | return -1; |
| 151 | if (mhz == pollux_cpu_clock_get()) |
| 152 | return 0; |
| 153 | |
| 154 | // m = MDIV, p = PDIV, s = SDIV |
| 155 | #define SYS_CLK_FREQ 27 |
| 156 | pdiv = 9; |
| 157 | mdiv = (mhz * pdiv) / SYS_CLK_FREQ; |
| 158 | if (mdiv & ~0x3ff) |
| 159 | return -1; |
| 160 | vf004 = (pdiv<<18) | (mdiv<<8) | sdiv; |
| 161 | |
| 162 | // attempt to keep the AHB divider close to 250, but not higher |
| 163 | for (adiv = 1; mhz / adiv > 250; adiv++) |
| 164 | ; |
| 165 | |
| 166 | vf000 = memregl[0xf000>>2]; |
| 167 | vf000 = (vf000 & ~0x3c0) | ((adiv - 1) << 6); |
| 168 | memregl[0xf000>>2] = vf000; |
| 169 | memregl[0xf004>>2] = vf004; |
| 170 | memregl[0xf07c>>2] |= 0x8000; |
| 171 | for (i = 0; (memregl[0xf07c>>2] & 0x8000) && i < 0x100000; i++) |
| 172 | ; |
| 173 | |
| 174 | printf("clock set to %dMHz, AHB set to %dMHz\n", mhz, mhz / adiv); |
| 175 | return 0; |
| 176 | } |
| 177 | |
| 178 | static int pollux_bat_capacity_get(void) |
| 179 | { |
| 180 | unsigned short magic_val = 0; |
| 181 | |
| 182 | if (battdev < 0) |
| 183 | return -1; |
| 184 | if (read(battdev, &magic_val, sizeof(magic_val)) != sizeof(magic_val)) |
| 185 | return -1; |
| 186 | switch (magic_val) { |
| 187 | default: |
| 188 | case 1: return 100; |
| 189 | case 2: return 66; |
| 190 | case 3: return 40; |
| 191 | case 4: return 0; |
| 192 | } |
| 193 | } |
| 194 | |
| 195 | static int step_volume(int *volume, int diff) |
| 196 | { |
| 197 | int ret, val; |
| 198 | |
| 199 | if (mixerdev < 0) |
| 200 | return -1; |
| 201 | |
| 202 | *volume += diff; |
| 203 | if (*volume > 255) |
| 204 | *volume = 255; |
| 205 | else if (*volume < 0) |
| 206 | *volume = 0; |
| 207 | |
| 208 | val = *volume; |
| 209 | val |= val << 8; |
| 210 | |
| 211 | ret = ioctl(mixerdev, SOUND_MIXER_WRITE_PCM, &val); |
| 212 | if (ret == -1) { |
| 213 | perror("WRITE_PCM"); |
| 214 | return ret; |
| 215 | } |
| 216 | |
| 217 | return 0; |
| 218 | } |
| 219 | |
| 220 | void pollux_init(void) |
| 221 | { |
| 222 | int rate, timer_div, timer_div2; |
| 223 | |
| 224 | memdev = open("/dev/mem", O_RDWR); |
| 225 | if (memdev == -1) { |
| 226 | perror("open(/dev/mem) failed"); |
| 227 | exit(1); |
| 228 | } |
| 229 | |
| 230 | memregs = mmap(0, 0x20000, PROT_READ|PROT_WRITE, MAP_SHARED, |
| 231 | memdev, 0xc0000000); |
| 232 | if (memregs == MAP_FAILED) { |
| 233 | perror("mmap(memregs) failed"); |
| 234 | exit(1); |
| 235 | } |
| 236 | memregl = (volatile void *)memregs; |
| 237 | |
| 238 | // save video regs of both MLCs |
| 239 | save_multiple_regs(saved_video_regs[0], 0x4058, ARRAY_SIZE(saved_video_regs[0])); |
| 240 | save_multiple_regs(saved_video_regs[1], 0x4458, ARRAY_SIZE(saved_video_regs[1])); |
| 241 | |
| 242 | /* some firmwares have sys clk on PLL0, we can't adjust CPU clock |
| 243 | * by reprogramming the PLL0 then, as it overclocks system bus */ |
| 244 | if ((memregl[0xf000>>2] & 0x03000030) == 0x01000000) |
| 245 | cpu_clock_allowed = 1; |
| 246 | else { |
| 247 | cpu_clock_allowed = 0; |
| 248 | fprintf(stderr, "unexpected PLL config (%08x), overclocking disabled\n", |
| 249 | memregl[0xf000>>2]); |
| 250 | } |
| 251 | |
| 252 | /* find what PLL1 runs at, for the timer */ |
| 253 | rate = decode_pll(memregl[0xf008>>2]); |
| 254 | printf("PLL1 @ %dHz\n", rate); |
| 255 | |
| 256 | /* setup timer */ |
| 257 | timer_div = (rate + 500000) / 1000000; |
| 258 | timer_div2 = 0; |
| 259 | while (timer_div > 256) { |
| 260 | timer_div /= 2; |
| 261 | timer_div2++; |
| 262 | } |
| 263 | if (1 <= timer_div && timer_div <= 256 && timer_div2 < 4) { |
| 264 | int timer_rate = (rate >> timer_div2) / timer_div; |
| 265 | if (TIMER_REG(0x08) & 8) { |
| 266 | fprintf(stderr, "warning: timer in use, overriding!\n"); |
| 267 | timer_cleanup(); |
| 268 | } |
| 269 | timer_drift = timer_rate - 1000000; |
| 270 | if (timer_drift != 0) |
| 271 | fprintf(stderr, "warning: timer drift %d us\n", |
| 272 | timer_drift); |
| 273 | |
| 274 | timer_div2 = (timer_div2 + 3) & 3; |
| 275 | TIMER_REG(0x44) = ((timer_div - 1) << 4) | 2; /* using PLL1 */ |
| 276 | TIMER_REG(0x40) = 0x0c; /* clocks on */ |
| 277 | TIMER_REG(0x08) = 0x68 | timer_div2; /* run timer, clear irq, latch value */ |
| 278 | } |
| 279 | else { |
| 280 | fprintf(stderr, "warning: could not make use of timer\n"); |
| 281 | |
| 282 | // those functions are actually not good at all on Wiz kernel |
| 283 | gp2x_get_ticks_ms = plat_get_ticks_ms_good; |
| 284 | gp2x_get_ticks_us = plat_get_ticks_us_good; |
| 285 | } |
| 286 | |
| 287 | battdev = open("/dev/pollux_batt", O_RDONLY); |
| 288 | if (battdev < 0) |
| 289 | perror("Warning: could't open pollux_batt"); |
| 290 | |
| 291 | mixerdev = open("/dev/mixer", O_RDWR); |
| 292 | if (mixerdev == -1) |
| 293 | perror("open(/dev/mixer)"); |
| 294 | |
| 295 | plat_target.cpu_clock_get = pollux_cpu_clock_get; |
| 296 | plat_target.cpu_clock_set = pollux_cpu_clock_set; |
| 297 | plat_target.bat_capacity_get = pollux_bat_capacity_get; |
| 298 | plat_target.step_volume = step_volume; |
| 299 | |
| 300 | gp2x_get_ticks_ms = gp2x_get_ticks_ms_; |
| 301 | gp2x_get_ticks_us = gp2x_get_ticks_us_; |
| 302 | } |
| 303 | |
| 304 | void pollux_finish(void) |
| 305 | { |
| 306 | timer_cleanup(); |
| 307 | |
| 308 | restore_multiple_regs(0x4058, saved_video_regs[0], |
| 309 | ARRAY_SIZE(saved_video_regs[0])); |
| 310 | restore_multiple_regs(0x4458, saved_video_regs[1], |
| 311 | ARRAY_SIZE(saved_video_regs[1])); |
| 312 | memregl[0x4058>>2] |= 0x10; |
| 313 | memregl[0x4458>>2] |= 0x10; |
| 314 | |
| 315 | if (battdev >= 0) |
| 316 | close(battdev); |
| 317 | if (mixerdev >= 0) |
| 318 | close(mixerdev); |
| 319 | munmap((void *)memregs, 0x20000); |
| 320 | close(memdev); |
| 321 | } |