[libpicofe.git] / gp2x / soc_mmsp2.c

/*
 * (C) Gražvydas "notaz" Ignotas, 2006-2012
 *
 * This work is licensed under the terms of any of these licenses
 * (at your option):
 *  - GNU GPL, version 2 or later.
 *  - GNU LGPL, version 2.1 or later.
 *  - MAME license.
 * See the COPYING file in the top-level directory.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <linux/soundcard.h>

#include "soc.h"
#include "soc_mmsp2.h"
#include "plat_gp2x.h"
#include "../plat.h"

static int mixerdev = -1;
static int touchdev = -1;
static int touchcal[7] = { 6203, 0, -1501397, 0, -4200, 16132680, 65536 };

static char gamma_was_changed = 0;
static char cpuclk_was_changed = 0;
static unsigned short memtimex_old[2];
static unsigned short reg0910;

/* 940 */
void pause940(int yes)
{
	if (yes)
		memregs[0x0904>>1] &= 0xFFFE;
	else
		memregs[0x0904>>1] |= 1;
}

void reset940(int yes, int bank)
{
	memregs[0x3B48>>1] = ((yes&1) << 7) | (bank & 0x03);
}

/*
 * CPU clock
 * Fout = (m * Fin) / (p * 2^s)
 * m = MDIV+8, p = PDIV+2, s = SDIV
 *
 * m = (Fout * p * 2^s) / Fin
 */

#define SYS_CLK_FREQ 7372800

static int cpu_current_mhz = 200;

static int mmsp2_clock_get(void)
{
	// TODO: read the actual value?
	return cpu_current_mhz;
}

static int mmsp2_clock_set(int mhz)
{
	unsigned int mdiv, pdiv, sdiv = 0;
	unsigned int v;
	int i;

	pdiv = 3;
	mdiv = (mhz * pdiv * 1000000) / SYS_CLK_FREQ;
	if (mdiv & ~0xff) {
		fprintf(stderr, "invalid cpuclk MHz: %u\n", mhz);
		return -1;
	}
	v = ((mdiv-8)<<8) | ((pdiv-2)<<2) | sdiv;
	memregs[0x910>>1] = v;

	for (i = 0; i < 10000; i++)
		if (!(memregs[0x902>>1] & 1))
			break;

	cpuclk_was_changed = 1;
	cpu_current_mhz = mhz;
	return 0;
}

/* RAM timings */
#define TIMING_CHECK(t, adj, mask) \
	t += adj; \
	if (t & ~mask) \
		goto bad

static __attribute__((noinline)) void spend_cycles(int c)
{
	asm volatile(
		"0: subs %0, %0, #1 ;"
		"bgt 0b"
		: "=r" (c) : "0" (c) : "cc");
}

static void set_ram_timing_vals(int tCAS, int tRC, int tRAS, int tWR, int tMRD, int tRFC, int tRP, int tRCD)
{
	int i;
	TIMING_CHECK(tCAS, -2, 0x1);
	TIMING_CHECK(tRC,  -1, 0xf);
	TIMING_CHECK(tRAS, -1, 0xf);
	TIMING_CHECK(tWR,  -1, 0xf);
	TIMING_CHECK(tMRD, -1, 0xf);
	TIMING_CHECK(tRFC, -1, 0xf);
	TIMING_CHECK(tRP,  -1, 0xf);
	TIMING_CHECK(tRCD, -1, 0xf);

	/* get spend_cycles() into cache */
	spend_cycles(1);

	memregs[0x3802>>1] = ((tMRD & 0xF) << 12) | ((tRFC & 0xF) << 8) | ((tRP & 0xF) << 4) | (tRCD & 0xF);
	memregs[0x3804>>1] = 0x8000 | ((tCAS & 1) << 12) | ((tRC & 0xF) << 8) | ((tRAS & 0xF) << 4) | (tWR & 0xF);

	/* be sure we don't access the mem while it's being reprogrammed */
	spend_cycles(128*1024);
	for (i = 0; i < 8*1024; i++)
		if (!(memregs[0x3804>>1] & 0x8000))
			break;

	printf("RAM timings set.\n");
	return;
bad:
	fprintf(stderr, "RAM timings invalid.\n");
}

static void set_ram_timings_(void)
{
	/* craigix: --cas 2 --trc 6 --tras 4 --twr 1 --tmrd 1 --trfc 1 --trp 2 --trcd 2 */
	set_ram_timing_vals(2, 6, 4, 1, 1, 1, 2, 2);
}

static void unset_ram_timings_(void)
{
	memregs[0x3802>>1] = memtimex_old[0];
	memregs[0x3804>>1] = memtimex_old[1] | 0x8000;
	printf("RAM timings reset to startup values.\n");
}

/* LCD refresh */
typedef struct
{
	unsigned short reg, valmask, val;
}
reg_setting;

/* 120.00 97/0/2/7|25/ 7/ 7/11/37 */
static const reg_setting lcd_rate_120[] =
{
	{ 0x0914, 0xffff, (97<<8)|(0<<2)|2 },	/* UPLLSETVREG */
	{ 0x0924, 0xff00, (2<<14)|(7<<8) },	/* DISPCSETREG */
	{ 0x281A, 0x00ff, 25 },			/* .HSWID(T2) */
	{ 0x281C, 0x00ff, 7 },			/* .HSSTR(T8) */
	{ 0x281E, 0x00ff, 7 },			/* .HSEND(T7) */
	{ 0x2822, 0x01ff, 11 },			/* .VSEND (T9) */
	{ 0x2826, 0x0ff0, 37<<4 },		/* .DESTR(T3) */
	{ 0, 0, 0 }
};

/* 100.00 96/0/2/7|29/25/53/15/37 */
static const reg_setting lcd_rate_100[] =
{
	{ 0x0914, 0xffff, (96<<8)|(0<<2)|2 },	/* UPLLSETVREG */
	{ 0x0924, 0xff00, (2<<14)|(7<<8) },	/* DISPCSETREG */
	{ 0x281A, 0x00ff, 29 },			/* .HSWID(T2) */
	{ 0x281C, 0x00ff, 25 },			/* .HSSTR(T8) */
	{ 0x281E, 0x00ff, 53 },			/* .HSEND(T7) */
	{ 0x2822, 0x01ff, 15 },			/* .VSEND (T9) */
	{ 0x2826, 0x0ff0, 37<<4 },		/* .DESTR(T3) */
	{ 0, 0, 0 }
};

static reg_setting lcd_rate_defaults[] =
{
	{ 0x0914, 0xffff, 0 },
	{ 0x0924, 0xff00, 0 },
	{ 0x281A, 0x00ff, 0 },
	{ 0x281C, 0x00ff, 0 },
	{ 0x281E, 0x00ff, 0 },
	{ 0x2822, 0x01ff, 0 },
	{ 0x2826, 0x0ff0, 0 },
	{ 0, 0, 0 }
};

static void get_reg_setting(reg_setting *set)
{
	for (; set->reg; set++)
	{
		unsigned short val = memregs[set->reg >> 1];
		val &= set->valmask;
		set->val = val;
	}
}

static void set_reg_setting(const reg_setting *set)
{
	for (; set->reg; set++)
	{
		unsigned short val = memregs[set->reg >> 1];
		val &= ~set->valmask;
		val |= set->val;
		memregs[set->reg >> 1] = val;
	}
}

static int mmsp2_lcdrate_set(int is_pal)
{
	if (memregs[0x2800>>1] & 0x100) // tv-out
		return 0;

	printf("setting custom LCD refresh (%d Hz)... ", is_pal ? 100 : 120);
	fflush(stdout);

	set_reg_setting(is_pal ? lcd_rate_100 : lcd_rate_120);
	printf("done.\n");
	return 0;
}

static void unset_lcd_custom_rate_(void)
{
	printf("reset to prev LCD refresh.\n");
	set_reg_setting(lcd_rate_defaults);
}

static void set_lcd_gamma_(int g100, int A_SNs_curve)
{
	float gamma = (float) g100 / 100.0f;
	int i;
	gamma = 1 / gamma;

	if (g100 == 100)
		A_SNs_curve = 0;

	/* enable gamma */
	memregs[0x2880>>1] &= ~(1<<12);

	memregs[0x295C>>1] = 0;
	for (i = 0; i < 256; i++)
	{
		unsigned char g;
		unsigned short s;
		const unsigned short grey50=143, grey75=177, grey25=97;
		double blah;

		if (A_SNs_curve)
		{
			// The next formula is all about gaussian interpolation
			blah = ((  -128 * exp(-powf((float) i/64.0f + 2.0f , 2.0f))) +
				(   -64 * exp(-powf((float) i/64.0f + 1.0f , 2.0f))) +
				(grey25 * exp(-powf((float) i/64.0f - 1.0f , 2.0f))) +
				(grey50 * exp(-powf((float) i/64.0f - 2.0f , 2.0f))) +
				(grey75 * exp(-powf((float) i/64.0f - 3.0f , 2.0f))) +
				(   256 * exp(-powf((float) i/64.0f - 4.0f , 2.0f))) +
				(   320 * exp(-powf((float) i/64.0f - 5.0f , 2.0f))) +
				(   384 * exp(-powf((float) i/64.0f - 6.0f , 2.0f)))) / 1.772637;
			blah += 0.5;
		}
		else
		{
			blah = (double)i;
		}

		g = (unsigned char)(255.0 * pow(blah/255.0, gamma));
		//printf("%d : %d\n", i, g);
		s = (g<<8) | g;
		memregs[0x295E>>1]= s;
		memregs[0x295E>>1]= g;
	}

	gamma_was_changed = 1;
}

static int mmsp2_gamma_set(int val, int black_level)
{
	set_lcd_gamma_(val, 1);
	return 0;
}

/* these are not quite MMSP2 related,
 * more to GP2X F100/F200 consoles themselves. */
typedef struct ucb1x00_ts_event
{
	unsigned short pressure;
	unsigned short x;
	unsigned short y;
	unsigned short pad;
	struct timeval stamp;
} UCB1X00_TS_EVENT;

int gp2x_touchpad_read(int *x, int *y)
{
	UCB1X00_TS_EVENT event;
	static int zero_seen = 0;
	int retval;

	if (touchdev < 0) return -1;

	retval = read(touchdev, &event, sizeof(event));
	if (retval <= 0) {
		perror("touch read failed");
		return -1;
	}
	// this is to ignore the messed-up 4.1.x driver
	if (event.pressure == 0) zero_seen = 1;

	if (x) *x = (event.x * touchcal[0] + touchcal[2]) >> 16;
	if (y) *y = (event.y * touchcal[4] + touchcal[5]) >> 16;
	// printf("read %i %i %i\n", event.pressure, *x, *y);

	return zero_seen ? event.pressure : 0;
}

static void proc_set(const char *path, const char *val)
{
	FILE *f;
	char tmp[16];

	f = fopen(path, "w");
	if (f == NULL) {
		printf("failed to open: %s\n", path);
		return;
	}

	fprintf(f, "0\n");
	fclose(f);

	printf("\"%s\" is set to: ", path);
	f = fopen(path, "r");
	if (f == NULL) {
		printf("(open failed)\n");
		return;
	}

	fgets(tmp, sizeof(tmp), f);
	printf("%s", tmp);
	fclose(f);
}

static int step_volume(int *volume, int diff)
{
	int ret, val;

	if (mixerdev < 0)
		return -1;

	*volume += diff;
	if (*volume >= 100)
		*volume = 100;
	else if (*volume < 0)
		*volume = 0;

	val = *volume;
	val |= val << 8;

 	ret = ioctl(mixerdev, SOUND_MIXER_WRITE_PCM, &val);
	if (ret == -1) {
		perror("WRITE_PCM");
		return ret;
	}

	return 0;
}

void mmsp2_init(void)
{
  	memdev = open("/dev/mem", O_RDWR);
	if (memdev == -1)
	{
		perror("open(\"/dev/mem\")");
		exit(1);
	}

	memregs = mmap(0, 0x10000, PROT_READ|PROT_WRITE, MAP_SHARED, memdev, 0xc0000000);
	if (memregs == MAP_FAILED)
	{
		perror("mmap(memregs)");
		exit(1);
	}
	memregl = (volatile unsigned int *) memregs;

	memregs[0x2880>>1] &= ~0x383; // disable cursor, subpict, osd, video layers

	/* save startup values: LCD refresh */
	get_reg_setting(lcd_rate_defaults);

	/* CPU and RAM timings */
	reg0910 = memregs[0x0910>>1];
	memtimex_old[0] = memregs[0x3802>>1];
	memtimex_old[1] = memregs[0x3804>>1];

	/* touchscreen */
	touchdev = open("/dev/touchscreen/wm97xx", O_RDONLY);
	if (touchdev >= 0) {
		FILE *pcf = fopen("/etc/pointercal", "r");
		if (pcf) {
			fscanf(pcf, "%d %d %d %d %d %d %d", &touchcal[0], &touchcal[1],
				&touchcal[2], &touchcal[3], &touchcal[4], &touchcal[5], &touchcal[6]);
			fclose(pcf);
		}
		printf("found touchscreen/wm97xx\n");
	}

	/* disable Linux read-ahead */
	proc_set("/proc/sys/vm/max-readahead", "0\n");
	proc_set("/proc/sys/vm/min-readahead", "0\n");

	mixerdev = open("/dev/mixer", O_RDWR);
	if (mixerdev == -1)
		perror("open(/dev/mixer)");

	set_ram_timings_();

	plat_target.cpu_clock_get = mmsp2_clock_get;
	plat_target.cpu_clock_set = mmsp2_clock_set;
	plat_target.lcdrate_set = mmsp2_lcdrate_set;
	plat_target.gamma_set = mmsp2_gamma_set;
	plat_target.step_volume = step_volume;

	gp2x_get_ticks_ms = plat_get_ticks_ms_good;
	gp2x_get_ticks_us = plat_get_ticks_us_good;
}

void mmsp2_finish(void)
{
	reset940(1, 3);
	pause940(1);

	unset_lcd_custom_rate_();
	if (gamma_was_changed)
		set_lcd_gamma_(100, 0);
	unset_ram_timings_();
	if (cpuclk_was_changed)
		memregs[0x910>>1] = reg0910;

	munmap((void *)memregs, 0x10000);
	close(memdev);
	if (touchdev >= 0)
		close(touchdev);
	if (mixerdev >= 0)
		close(mixerdev);
}
Commit	Line	Data
f89d8471	1	/*
	2	* (C) Gražvydas "notaz" Ignotas, 2006-2012
	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
d572cbad	12	#include <stdio.h>
	13	#include <stdlib.h>
	14	#include <string.h>
fa5e045b	15	#include <math.h>
d572cbad	16	#include <sys/types.h>
	17	#include <sys/stat.h>
	18	#include <fcntl.h>
	19	#include <sys/mman.h>
7ceadd99	20	#include <sys/ioctl.h>
d572cbad	21	#include <unistd.h>
7ceadd99	22	#include <linux/soundcard.h>
d572cbad	23
	24	#include "soc.h"
	25	#include "soc_mmsp2.h"
fa5e045b	26	#include "plat_gp2x.h"
a86e9a3e	27	#include "../plat.h"
d572cbad	28
7ceadd99	29	static int mixerdev = -1;
d572cbad	30	static int touchdev = -1;
	31	static int touchcal[7] = { 6203, 0, -1501397, 0, -4200, 16132680, 65536 };
	32
71769e27	33	static char gamma_was_changed = 0;
71769e27	34	static char cpuclk_was_changed = 0;
71769e27	35	static unsigned short memtimex_old[2];
71769e27	36	static unsigned short reg0910;
d572cbad	37
d572cbad	38	/* 940 */
	39	void pause940(int yes)
	40	{
	41	if (yes)
7ceadd99	42	memregs[0x0904>>1] &= 0xFFFE;
d572cbad	43	else
7ceadd99	44	memregs[0x0904>>1] \|= 1;
d572cbad	45	}
	46
	47	void reset940(int yes, int bank)
	48	{
7ceadd99	49	memregs[0x3B48>>1] = ((yes&1) << 7) \| (bank & 0x03);
d572cbad	50	}
d572cbad	51
fa5e045b	52	/*
	53	* CPU clock
	54	* Fout = (m * Fin) / (p * 2^s)
	55	* m = MDIV+8, p = PDIV+2, s = SDIV
	56	*
	57	* m = (Fout * p * 2^s) / Fin
	58	*/
	59
	60	#define SYS_CLK_FREQ 7372800
	61
7ceadd99	62	static int cpu_current_mhz = 200;
	63
	64	static int mmsp2_clock_get(void)
	65	{
	66	// TODO: read the actual value?
	67	return cpu_current_mhz;
	68	}
	69
	70	static int mmsp2_clock_set(int mhz)
fa5e045b	71	{
	72	unsigned int mdiv, pdiv, sdiv = 0;
	73	unsigned int v;
	74	int i;
	75
	76	pdiv = 3;
	77	mdiv = (mhz * pdiv * 1000000) / SYS_CLK_FREQ;
	78	if (mdiv & ~0xff) {
	79	fprintf(stderr, "invalid cpuclk MHz: %u\n", mhz);
7ceadd99	80	return -1;
fa5e045b	81	}
fa5e045b	82	v = ((mdiv-8)<<8) \| ((pdiv-2)<<2) \| sdiv;
7ceadd99	83	memregs[0x910>>1] = v;
fa5e045b	84
fa5e045b	85	for (i = 0; i < 10000; i++)
7ceadd99	86	if (!(memregs[0x902>>1] & 1))
fa5e045b	87	break;
71769e27	88
71769e27	89	cpuclk_was_changed = 1;
7ceadd99	90	cpu_current_mhz = mhz;
7ceadd99	91	return 0;
fa5e045b	92	}
	93
	94	/* RAM timings */
fa5e045b	95	#define TIMING_CHECK(t, adj, mask) \
	96	t += adj; \
	97	if (t & ~mask) \
	98	goto bad
	99
7ceadd99	100	static __attribute__((noinline)) void spend_cycles(int c)
	101	{
	102	asm volatile(
	103	"0: subs %0, %0, #1 ;"
	104	"bgt 0b"
	105	: "=r" (c) : "0" (c) : "cc");
	106	}
	107
fa8d1331	108	static void set_ram_timing_vals(int tCAS, int tRC, int tRAS, int tWR, int tMRD, int tRFC, int tRP, int tRCD)
fa5e045b	109	{
	110	int i;
	111	TIMING_CHECK(tCAS, -2, 0x1);
	112	TIMING_CHECK(tRC, -1, 0xf);
	113	TIMING_CHECK(tRAS, -1, 0xf);
	114	TIMING_CHECK(tWR, -1, 0xf);
	115	TIMING_CHECK(tMRD, -1, 0xf);
	116	TIMING_CHECK(tRFC, -1, 0xf);
	117	TIMING_CHECK(tRP, -1, 0xf);
	118	TIMING_CHECK(tRCD, -1, 0xf);
	119
	120	/* get spend_cycles() into cache */
	121	spend_cycles(1);
	122
7ceadd99	123	memregs[0x3802>>1] = ((tMRD & 0xF) << 12) \| ((tRFC & 0xF) << 8) \| ((tRP & 0xF) << 4) \| (tRCD & 0xF);
7ceadd99	124	memregs[0x3804>>1] = 0x8000 \| ((tCAS & 1) << 12) \| ((tRC & 0xF) << 8) \| ((tRAS & 0xF) << 4) \| (tWR & 0xF);
fa5e045b	125
	126	/* be sure we don't access the mem while it's being reprogrammed */
	127	spend_cycles(128*1024);
	128	for (i = 0; i < 8*1024; i++)
7ceadd99	129	if (!(memregs[0x3804>>1] & 0x8000))
fa5e045b	130	break;
	131
	132	printf("RAM timings set.\n");
	133	return;
	134	bad:
	135	fprintf(stderr, "RAM timings invalid.\n");
	136	}
	137
fa8d1331	138	static void set_ram_timings_(void)
	139	{
	140	/* craigix: --cas 2 --trc 6 --tras 4 --twr 1 --tmrd 1 --trfc 1 --trp 2 --trcd 2 */
	141	set_ram_timing_vals(2, 6, 4, 1, 1, 1, 2, 2);
	142	}
	143
	144	static void unset_ram_timings_(void)
fa5e045b	145	{
7ceadd99	146	memregs[0x3802>>1] = memtimex_old[0];
7ceadd99	147	memregs[0x3804>>1] = memtimex_old[1] \| 0x8000;
fa5e045b	148	printf("RAM timings reset to startup values.\n");
	149	}
	150
	151	/* LCD refresh */
	152	typedef struct
	153	{
	154	unsigned short reg, valmask, val;
	155	}
	156	reg_setting;
	157
	158	/* 120.00 97/0/2/7\|25/ 7/ 7/11/37 */
	159	static const reg_setting lcd_rate_120[] =
	160	{
	161	{ 0x0914, 0xffff, (97<<8)\|(0<<2)\|2 }, /* UPLLSETVREG */
	162	{ 0x0924, 0xff00, (2<<14)\|(7<<8) }, /* DISPCSETREG */
	163	{ 0x281A, 0x00ff, 25 }, /* .HSWID(T2) */
	164	{ 0x281C, 0x00ff, 7 }, /* .HSSTR(T8) */
	165	{ 0x281E, 0x00ff, 7 }, /* .HSEND(T7) */
	166	{ 0x2822, 0x01ff, 11 }, /* .VSEND (T9) */
	167	{ 0x2826, 0x0ff0, 37<<4 }, /* .DESTR(T3) */
	168	{ 0, 0, 0 }
	169	};
	170
	171	/* 100.00 96/0/2/7\|29/25/53/15/37 */
	172	static const reg_setting lcd_rate_100[] =
	173	{
	174	{ 0x0914, 0xffff, (96<<8)\|(0<<2)\|2 }, /* UPLLSETVREG */
	175	{ 0x0924, 0xff00, (2<<14)\|(7<<8) }, /* DISPCSETREG */
	176	{ 0x281A, 0x00ff, 29 }, /* .HSWID(T2) */
	177	{ 0x281C, 0x00ff, 25 }, /* .HSSTR(T8) */
	178	{ 0x281E, 0x00ff, 53 }, /* .HSEND(T7) */
	179	{ 0x2822, 0x01ff, 15 }, /* .VSEND (T9) */
	180	{ 0x2826, 0x0ff0, 37<<4 }, /* .DESTR(T3) */
	181	{ 0, 0, 0 }
	182	};
	183
	184	static reg_setting lcd_rate_defaults[] =
	185	{
	186	{ 0x0914, 0xffff, 0 },
	187	{ 0x0924, 0xff00, 0 },
	188	{ 0x281A, 0x00ff, 0 },
	189	{ 0x281C, 0x00ff, 0 },
	190	{ 0x281E, 0x00ff, 0 },
	191	{ 0x2822, 0x01ff, 0 },
	192	{ 0x2826, 0x0ff0, 0 },
	193	{ 0, 0, 0 }
	194	};
	195
	196	static void get_reg_setting(reg_setting *set)
	197	{
	198	for (; set->reg; set++)
	199	{
7ceadd99	200	unsigned short val = memregs[set->reg >> 1];
fa5e045b	201	val &= set->valmask;
	202	set->val = val;
	203	}
	204	}
	205
	206	static void set_reg_setting(const reg_setting *set)
	207	{
	208	for (; set->reg; set++)
	209	{
7ceadd99	210	unsigned short val = memregs[set->reg >> 1];
fa5e045b	211	val &= ~set->valmask;
fa5e045b	212	val \|= set->val;
7ceadd99	213	memregs[set->reg >> 1] = val;
fa5e045b	214	}
	215	}
	216
7ceadd99	217	static int mmsp2_lcdrate_set(int is_pal)
fa5e045b	218	{
7ceadd99	219	if (memregs[0x2800>>1] & 0x100) // tv-out
7ceadd99	220	return 0;
fa5e045b	221
	222	printf("setting custom LCD refresh (%d Hz)... ", is_pal ? 100 : 120);
	223	fflush(stdout);
	224
	225	set_reg_setting(is_pal ? lcd_rate_100 : lcd_rate_120);
	226	printf("done.\n");
7ceadd99	227	return 0;
fa5e045b	228	}
fa5e045b	229
fa8d1331	230	static void unset_lcd_custom_rate_(void)
fa5e045b	231	{
	232	printf("reset to prev LCD refresh.\n");
	233	set_reg_setting(lcd_rate_defaults);
	234	}
	235
fa8d1331	236	static void set_lcd_gamma_(int g100, int A_SNs_curve)
fa5e045b	237	{
7ceadd99	238	float gamma = (float) g100 / 100.0f;
fa5e045b	239	int i;
	240	gamma = 1 / gamma;
	241
7ceadd99	242	if (g100 == 100)
	243	A_SNs_curve = 0;
	244
fa5e045b	245	/* enable gamma */
7ceadd99	246	memregs[0x2880>>1] &= ~(1<<12);
fa5e045b	247
7ceadd99	248	memregs[0x295C>>1] = 0;
fa5e045b	249	for (i = 0; i < 256; i++)
	250	{
	251	unsigned char g;
	252	unsigned short s;
	253	const unsigned short grey50=143, grey75=177, grey25=97;
	254	double blah;
	255
	256	if (A_SNs_curve)
	257	{
	258	// The next formula is all about gaussian interpolation
	259	blah = (( -128 * exp(-powf((float) i/64.0f + 2.0f , 2.0f))) +
	260	( -64 * exp(-powf((float) i/64.0f + 1.0f , 2.0f))) +
	261	(grey25 * exp(-powf((float) i/64.0f - 1.0f , 2.0f))) +
	262	(grey50 * exp(-powf((float) i/64.0f - 2.0f , 2.0f))) +
	263	(grey75 * exp(-powf((float) i/64.0f - 3.0f , 2.0f))) +
	264	( 256 * exp(-powf((float) i/64.0f - 4.0f , 2.0f))) +
	265	( 320 * exp(-powf((float) i/64.0f - 5.0f , 2.0f))) +
	266	( 384 * exp(-powf((float) i/64.0f - 6.0f , 2.0f)))) / 1.772637;
	267	blah += 0.5;
	268	}
	269	else
	270	{
7ceadd99	271	blah = (double)i;
fa5e045b	272	}
	273
	274	g = (unsigned char)(255.0 * pow(blah/255.0, gamma));
	275	//printf("%d : %d\n", i, g);
	276	s = (g<<8) \| g;
7ceadd99	277	memregs[0x295E>>1]= s;
7ceadd99	278	memregs[0x295E>>1]= g;
fa5e045b	279	}
71769e27	280
71769e27	281	gamma_was_changed = 1;
fa5e045b	282	}
fa5e045b	283
7ceadd99	284	static int mmsp2_gamma_set(int val, int black_level)
053bef76	285	{
7ceadd99	286	set_lcd_gamma_(val, 1);
7ceadd99	287	return 0;
053bef76	288	}
d572cbad	289
	290	/* these are not quite MMSP2 related,
	291	* more to GP2X F100/F200 consoles themselves. */
	292	typedef struct ucb1x00_ts_event
	293	{
	294	unsigned short pressure;
	295	unsigned short x;
	296	unsigned short y;
	297	unsigned short pad;
	298	struct timeval stamp;
	299	} UCB1X00_TS_EVENT;
	300
	301	int gp2x_touchpad_read(int x, int y)
	302	{
	303	UCB1X00_TS_EVENT event;
	304	static int zero_seen = 0;
	305	int retval;
	306
	307	if (touchdev < 0) return -1;
	308
	309	retval = read(touchdev, &event, sizeof(event));
	310	if (retval <= 0) {
	311	perror("touch read failed");
	312	return -1;
	313	}
	314	// this is to ignore the messed-up 4.1.x driver
	315	if (event.pressure == 0) zero_seen = 1;
	316
	317	if (x) x = (event.x touchcal[0] + touchcal[2]) >> 16;
	318	if (y) y = (event.y touchcal[4] + touchcal[5]) >> 16;
	319	// printf("read %i %i %i\n", event.pressure, x, y);
	320
	321	return zero_seen ? event.pressure : 0;
	322	}
	323
	324	static void proc_set(const char path, const char val)
	325	{
	326	FILE *f;
	327	char tmp[16];
	328
	329	f = fopen(path, "w");
	330	if (f == NULL) {
	331	printf("failed to open: %s\n", path);
	332	return;
	333	}
	334
	335	fprintf(f, "0\n");
	336	fclose(f);
	337
	338	printf("\"%s\" is set to: ", path);
	339	f = fopen(path, "r");
	340	if (f == NULL) {
	341	printf("(open failed)\n");
	342	return;
	343	}
	344
	345	fgets(tmp, sizeof(tmp), f);
	346	printf("%s", tmp);
	347	fclose(f);
	348	}
	349
7ceadd99	350	static int step_volume(int *volume, int diff)
	351	{
	352	int ret, val;
	353
	354	if (mixerdev < 0)
	355	return -1;
	356
	357	*volume += diff;
	358	if (*volume >= 100)
	359	*volume = 100;
	360	else if (*volume < 0)
	361	*volume = 0;
	362
	363	val = *volume;
	364	val \|= val << 8;
	365
	366	ret = ioctl(mixerdev, SOUND_MIXER_WRITE_PCM, &val);
	367	if (ret == -1) {
	368	perror("WRITE_PCM");
	369	return ret;
	370	}
	371
	372	return 0;
	373	}
d572cbad	374
	375	void mmsp2_init(void)
	376	{
d572cbad	377	memdev = open("/dev/mem", O_RDWR);
	378	if (memdev == -1)
	379	{
	380	perror("open(\"/dev/mem\")");
	381	exit(1);
	382	}
	383
7ceadd99	384	memregs = mmap(0, 0x10000, PROT_READ\|PROT_WRITE, MAP_SHARED, memdev, 0xc0000000);
7ceadd99	385	if (memregs == MAP_FAILED)
d572cbad	386	{
	387	perror("mmap(memregs)");
	388	exit(1);
	389	}
7ceadd99	390	memregl = (volatile unsigned int *) memregs;
d572cbad	391
7ceadd99	392	memregs[0x2880>>1] &= ~0x383; // disable cursor, subpict, osd, video layers
d572cbad	393
71769e27	394	/* save startup values: LCD refresh */
fa5e045b	395	get_reg_setting(lcd_rate_defaults);
fa5e045b	396
71769e27	397	/* CPU and RAM timings */
7ceadd99	398	reg0910 = memregs[0x0910>>1];
	399	memtimex_old[0] = memregs[0x3802>>1];
	400	memtimex_old[1] = memregs[0x3804>>1];
fa5e045b	401
fa5e045b	402	/* touchscreen */
d572cbad	403	touchdev = open("/dev/touchscreen/wm97xx", O_RDONLY);
	404	if (touchdev >= 0) {
	405	FILE *pcf = fopen("/etc/pointercal", "r");
	406	if (pcf) {
	407	fscanf(pcf, "%d %d %d %d %d %d %d", &touchcal[0], &touchcal[1],
	408	&touchcal[2], &touchcal[3], &touchcal[4], &touchcal[5], &touchcal[6]);
	409	fclose(pcf);
	410	}
	411	printf("found touchscreen/wm97xx\n");
	412	}
	413
	414	/* disable Linux read-ahead */
	415	proc_set("/proc/sys/vm/max-readahead", "0\n");
	416	proc_set("/proc/sys/vm/min-readahead", "0\n");
fa5e045b	417
7ceadd99	418	mixerdev = open("/dev/mixer", O_RDWR);
	419	if (mixerdev == -1)
	420	perror("open(/dev/mixer)");
fa8d1331	421
7ceadd99	422	set_ram_timings_();
fa8d1331	423
7ceadd99	424	plat_target.cpu_clock_get = mmsp2_clock_get;
	425	plat_target.cpu_clock_set = mmsp2_clock_set;
	426	plat_target.lcdrate_set = mmsp2_lcdrate_set;
	427	plat_target.gamma_set = mmsp2_gamma_set;
	428	plat_target.step_volume = step_volume;
b5bfb864	429
1eb704b6	430	gp2x_get_ticks_ms = plat_get_ticks_ms_good;
1eb704b6	431	gp2x_get_ticks_us = plat_get_ticks_us_good;
d572cbad	432	}
	433
	434	void mmsp2_finish(void)
	435	{
	436	reset940(1, 3);
	437	pause940(1);
d572cbad	438
fa8d1331	439	unset_lcd_custom_rate_();
71769e27	440	if (gamma_was_changed)
	441	set_lcd_gamma_(100, 0);
	442	unset_ram_timings_();
	443	if (cpuclk_was_changed)
7ceadd99	444	memregs[0x910>>1] = reg0910;
fa5e045b	445
7ceadd99	446	munmap((void *)memregs, 0x10000);
d572cbad	447	close(memdev);
	448	if (touchdev >= 0)
	449	close(touchdev);
7ceadd99	450	if (mixerdev >= 0)
7ceadd99	451	close(mixerdev);
d572cbad	452	}