diff options
Diffstat (limited to 'backends/platform/gp2x/gp2x-hw.cpp')
| -rw-r--r-- | backends/platform/gp2x/gp2x-hw.cpp | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/backends/platform/gp2x/gp2x-hw.cpp b/backends/platform/gp2x/gp2x-hw.cpp new file mode 100644 index 0000000000..e967b6df62 --- /dev/null +++ b/backends/platform/gp2x/gp2x-hw.cpp @@ -0,0 +1,248 @@ +/* ScummVM - Scumm Interpreter + * Copyright (C) 2001 Ludvig Strigeus + * Copyright (C) 2001-2006 The ScummVM project + * Copyright (C) 2005-2006 John Willis (Portions of the GP2X Backend) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * $URL$ + * $Id$ + * + */ + +/* + * GP2X: Hardware Stuff. + * Thanks to Rlyeh, Snaff, Squidge, Hermes, PS2Reality and RobBrown + * for there help with us all getting to grips with this. + * + */ + +#include "gp2x-common.h" + +#include "gp2x-hw.h" + +// Linux includes to let us goof about with the system. +#include <sys/mman.h> +#include <sys/ioctl.h> +#include <sys/soundcard.h> + +static unsigned long gp2x_dev[8]={0,0,0,0,0,0,0,0};//, gp2x_ticks_per_second; +static volatile unsigned short *gp2x_memregs; + +/* system registers */ +static struct +{ + unsigned short SYSCLKENREG,SYSCSETREG,FPLLVSETREG,DUALINT920,DUALINT940,DUALCTRL940; +} +system_reg; + +static unsigned short dispclockdiv; + +static volatile unsigned short *MEM_REG; + +#define SYS_CLK_FREQ 7372800 + +void GP2X_device_init() { + // Open devices + if(!gp2x_dev[0]) gp2x_dev[0] = open("/dev/mixer", O_RDWR); + if(!gp2x_dev[1]) gp2x_dev[1] = open("/dev/batt", O_RDONLY); + if(!gp2x_dev[2]) gp2x_dev[2] = open("/dev/mem", O_RDWR); +} + +void GP2X_device_deinit() { + // Close devices + if (gp2x_dev[0]) close(gp2x_dev[0]); + if (gp2x_dev[1]) close(gp2x_dev[1]); + if (gp2x_dev[2]) close(gp2x_dev[2]); + + MEM_REG[0x91c>>1]=system_reg.SYSCSETREG; + MEM_REG[0x910>>1]=system_reg.FPLLVSETREG; + MEM_REG[0x3B40>>1]=system_reg.DUALINT920; + MEM_REG[0x3B42>>1]=system_reg.DUALINT940; + MEM_REG[0x3B48>>1]=system_reg.DUALCTRL940; + MEM_REG[0x904>>1]=system_reg.SYSCLKENREG; + MEM_REG[0x924>>1]=dispclockdiv; +} + + +// Vairous mixer level fudges. +// TODO: Clean up and merge quick hacks. + +void GP2X_mixer_set_volume(int L /*0..100*/, int R /*0..100*/) { + + /* Set an arbitrary percentage value for the hardware mixer volume. + + Parameters: + L (0..100) - volume percentage for the left channel + R (0..100) - volume percentage for the right channel + + Note: + - A higher percentage than 100 will distort your sound. + */ + + unsigned char temp[4]; + + if (L < 0) L = 0; + if (L > GP2X_MAXVOL) L = GP2X_MAXVOL; + if (R < 0) R = 0; + if (R > GP2X_MAXVOL) R = GP2X_MAXVOL; + + temp[0]=(unsigned char)L; + temp[1]=(unsigned char)R; + temp[2]=temp[3]=0; + + //warning("GP2X_mixer_set_volume is about to set %d %d", L, R); + ioctl(gp2x_dev[0], SOUND_MIXER_WRITE_PCM, temp); +} + +int GP2X_mixer_get_volume() { + int vol; + ioctl(gp2x_dev[0], SOUND_MIXER_READ_PCM, &vol); + //warning("GP2X_mixer_get_volume returned %d %d", (int)((vol & 0xff)), (int)((vol >> 8) & 0xff)); + return (int)((vol & 0xff)); +} + +void GP2X_mixer_move_volume(int UpDown) { + // Raise volume 5% if 1 passed, lower 5% if 0. + int curvol, newvol; + ioctl(gp2x_dev[0], SOUND_MIXER_READ_PCM, &curvol); + curvol = ((int)((curvol & 0xff))); + newvol = ((int)((curvol & 0xff))); + //warning("GP2X_mixer_move_volume got current volume @ %d", curvol); + if (UpDown == 1) { + newvol = (curvol + 5); + } else if (UpDown == 0) { + newvol = (curvol - 5); + } + //warning("GP2X_mixer_move_volume is about to set volume @ %d", newvol); + GP2X_mixer_set_volume(newvol, newvol); + return; +} + +void GP2X_setCpuspeed(unsigned int mhz) +{ + set_FCLK(mhz); + set_DCLK_Div(0); + set_920_Div(0); +} + +void set_display_clock_div(unsigned div) +{ + div=((div & 63) | 64)<<8; + MEM_REG[0x924>>1]=(MEM_REG[0x924>>1] & ~(255<<8)) | div; +} + + +void set_FCLK(unsigned MHZ) +{ + unsigned v; + unsigned mdiv,pdiv=3,scale=0; + MHZ*=1000000; + mdiv=(MHZ*pdiv)/SYS_CLK_FREQ; + mdiv=((mdiv-8)<<8) & 0xff00; + pdiv=((pdiv-2)<<2) & 0xfc; + scale&=3; + v=mdiv | pdiv | scale; + MEM_REG[0x910>>1]=v; +} + + +void set_920_Div(unsigned short div) +{ + unsigned short v; + v = MEM_REG[0x91c>>1] & (~0x3); + MEM_REG[0x91c>>1] = (div & 0x7) | v; +} + + +void set_DCLK_Div( unsigned short div ) +{ + unsigned short v; + v = (unsigned short)( MEM_REG[0x91c>>1] & (~(0x7 << 6)) ); + MEM_REG[0x91c>>1] = ((div & 0x7) << 6) | v; +} + + +void Disable_940(void) +{ + MEM_REG[0x3B42>>1]; + MEM_REG[0x3B42>>1]=0; + MEM_REG[0x3B46>>1]=0xffff; + MEM_REG[0x3B48>>1]|= (1 << 7); + MEM_REG[0x904>>1]&=0xfffe; +} + +void gp2x_video_wait_vsync(void) +{ + MEM_REG[0x2846>>1]=(MEM_REG[0x2846>>1] | 0x20) & ~2; + while(!(MEM_REG[0x2846>>1] & 2)); +} + +//char GP2X_get_battery_level() { + // Returns string of level in English for use in displayMessageOnOSD() to show battery level. + // + //if (gp2x_dev[1] == -1) + //{ + // warning("Error occured getting voltage status"); + // return "Unable to read battery level."; + //} + // + //int i; + //int battval; + //unsigned short cbv; + //int v; + // + //battval = 0; + //for (i = 0; i < 1000; i ++) + //{ + // if (read (gp2x_dev[1], &cbv, 2) == 2) + // battval += cbv; + // if (gp2x_joystick_read() & GP2X_START) + // { + // needexit = 1; + // break; + // } + //} + //if (needexit) break; + // + //battval /= 1000; + + // Do a very rough translation + //if (battval > 1016) v = 37; + //else if (battval > 974) v = 33; + //else if (battval > 943) v = 32; + //else if (battval > 915) v = 31; + //else if (battval > 896) v = 30; + //else if (battval > 837) v = 29; + //else if (battval > 815) v = 28; + //else if (battval > 788) v = 27; + //else if (battval > 745) v = 26; + //else if (battval > 708) v = 25; + //else if (battval > 678) v = 24; + //else if (battval > 649) v = 23; + //else if (battval > 605) v = 22; + //else if (battval > 573) v = 21; + //else if (battval > 534) v = 20; + //else if (battval > 496) v = 19; + //else if (battval > 448) v = 18; + //else v = 17; + + //gp2x_printf (NULL, 0, 0, "Voltage: ~%d.%dV (%s)", v/10, v%10, v>26?"Battery Full" : v>24?"Battery Medium" : "Battery Empty"); + //gp2x_video_RGB_flip(0); + //} + //close (gp2x_dev[1]); + + //return "Voltage: ~%d.%dV (%s)", v/10, v%10, v>26?"Battery Full" : v>24?"Battery Medium" : "Battery Empty"; +//} |