ref: 41e27b2d10c6a60c49931332e8677438736a1e36
dir: /os/boot/rpcg/screen.c/
#include "all.h" #include <libg.h> #include <gnot.h> enum { Colldepth = 3, Colmaxx = 640, Colmaxxvis = 640, Colmaxy = 480, }; #define MINX 8 extern GSubfont defont0; struct{ Point pos; int bwid; }out; typedef struct Mode Mode; struct Mode { int x; int y; int d; char* aperture; int apsize; }; GBitmap gscreen; Point gchar(GBitmap*, Point, GFont*, int, Fcode); int setcolor(ulong, ulong, ulong, ulong); static void lcdinit(Mode*); void screeninit(void) { Mode m; m.x = Colmaxx; m.y = Colmaxy; m.d = Colldepth; m.aperture = 0; lcdinit(&m); if(m.aperture == 0) return; gscreen.ldepth = 3; gscreen.base = (ulong*)m.aperture; gscreen.width = Colmaxx/BY2WD; gscreen.r = Rect(0, 0, Colmaxxvis, Colmaxy); gscreen.clipr = gscreen.r; /* * For now, just use a fixed colormap: * 0 == white and 255 == black */ setcolor(0, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF); setcolor(255, 0x00000000, 0x00000000, 0x00000000); gbitblt(&gscreen, Pt(0, 0), &gscreen, gscreen.r, Zero); out.pos.x = MINX; out.pos.y = 0; out.bwid = defont0.info[' '].width; } void screenputc(int c) { Fontchar *i; Point p; if(gscreen.base == nil) return; switch(c){ case '\n': out.pos.x = MINX; out.pos.y += defont0.height; if(out.pos.y > gscreen.r.max.y-defont0.height) out.pos.y = gscreen.r.min.y; gbitblt(&gscreen, Pt(0, out.pos.y), &gscreen, Rect(0, out.pos.y, gscreen.r.max.x, out.pos.y+2*defont0.height), Zero); break; case '\t': out.pos.x += (8-((out.pos.x-MINX)/out.bwid&7))*out.bwid; if(out.pos.x >= gscreen.r.max.x) screenputc('\n'); break; case '\b': if(out.pos.x >= out.bwid+MINX){ out.pos.x -= out.bwid; screenputc(' '); out.pos.x -= out.bwid; } break; default: if(out.pos.x >= gscreen.r.max.x-out.bwid) screenputc('\n'); c &= 0x7f; if(c <= 0 || c >= defont0.n) break; i = defont0.info + c; p = out.pos; gbitblt(&gscreen, Pt(p.x+i->left, p.y), defont0.bits, Rect(i[0].x, 0, i[1].x, defont0.height), S); out.pos.x = p.x + i->width; break; } } void screenputs(char *s, int n) { while(n-- > 0) screenputc(*s++); } /* * See section 5.2.1 (page 5-6) of the MPC823 manual */ static uchar lcdclock[17] = { /* (a<<2)|b => divisor of (1<<a)*((b<<1)+1) */ 0, 0, (1<<2), 1, (2<<2), 2, (1<<2)|1, 3, (3<<2), (1<<2)|2, (1<<2)|2, (2<<2)|1, (2<<2)|1, (1<<2)|3, (1<<2)|3, (4<<2), (4<<2) }; /* * support for the Sharp LQ64D341 TFT colour display */ enum { COLS = 640, ROWS = 480, LDEPTH = 3, /* screen depth */ LCDFREQ = 25000000, /* lccr */ ClockLow = 1<<11, OELow = 1<<10, HsyncLow = 1<<9, VsyncLow = 1<<8, DataLow = 1<<7, Passive8 = 1<<4, DualScan = 1<<3, IsColour = 1<<2, IsTFT = 1<<1, Enable = 1<<0, /* lchcr */ BigEndian = 1<<24, AT7 = 7<<21, /* access type */ /* sdcr */ LAM = 1<<6, /* ``LCD aggressive mode'' */ }; /* * TO DO: most of the data could come from a table */ static void lcdinit(Mode *mode) { IMM *io; int i, d; long hz; io = m->iomem; mode->y = ROWS; mode->x = COLS; mode->d = LDEPTH; mode->aperture = ialloc(mode->x*mode->y, 16); mode->apsize = mode->x*mode->y; io->sdcr &= ~LAM; /* MPC823 errata: turn off LAM before disabling controller */ io->lcfaa = PADDR(mode->aperture); io->lccr = (((mode->x*mode->y*(1<<LDEPTH)+127)/128) << 17) | (LDEPTH << 5) | IsColour | IsTFT | OELow | VsyncLow | ClockLow; switch(LDEPTH){ default: case 0: /* monochrome/greyscale identity map */ for(i=0; i<16; i++) io->lcdmap[i] = i; break; case 2: /* 4-bit grey scale map */ for(i=0; i<16; i++) io->lcdmap[0] = (i<<8)|(i<<4)|i; break; case 3: /* 8-bit linear map */ for(i=0; i<256; i++) io->lcdmap[i] = (i<<8)|(i<<4)|i; break; } io->lcvcr = (mode->y << 11) | (1<<28) | 33; /* 2 line vsync pulse, 34 line wait between frames */ io->lchcr = (mode->x<<10) | BigEndian | 228; /* clock cycles between lines */ hz = m->cpuhz; d = hz/LCDFREQ; if(hz/d > LCDFREQ) d++; if(d >= 16) d = 16; /* * enable LCD outputs */ io->pddat = 0; io->pdpar = 0x1fff; io->pdpar &= ~SIBIT(6); /* 823 bug fix? */ io->pddir = 0x1fff; io->pbpar |= IBIT(31) | IBIT(19) | IBIT(17); io->pbdir |= IBIT(31) | IBIT(19) | IBIT(17); io->pbodr &= ~(IBIT(31) | IBIT(19) | IBIT(17)); eieio(); io->sccrk = KEEP_ALIVE_KEY; eieio(); io->sccr = (io->sccr & ~0x1F) | lcdclock[d]; eieio(); io->sccrk = ~KEEP_ALIVE_KEY; eieio(); gscreen.width = gscreen.width; /* access external memory before enabling (mpc823 errata) */ io->lcsr = 7; /* clear status */ eieio(); io->lccr |= Enable; archbacklight(1); } int setcolor(ulong p, ulong r, ulong g, ulong b) { r >>= 28; g >>= 28; b >>= 28; m->iomem->lcdmap[~p&0xFF] = (r<<8) | (g<<4) | b; /* TO DO: it's a function of the ldepth */ return 1; }