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/* $Id: cgthreefb.c,v 1.1 1998/07/21 14:50:47 jj Exp $
* cgthreefb.c: CGthree frame buffer driver
*
* Copyright (C) 1996,1998 Jakub Jelinek (jj@ultra.linux.cz)
* Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
* Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
*/
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/tty.h>
#include <linux/malloc.h>
#include <linux/vmalloc.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/selection.h>
#include "sbusfb.h"
#include <asm/io.h>
#include "fbcon-cfb8.h"
/* Control Register Constants */
#define CG3_CR_ENABLE_INTS 0x80
#define CG3_CR_ENABLE_VIDEO 0x40
#define CG3_CR_ENABLE_TIMING 0x20
#define CG3_CR_ENABLE_CURCMP 0x10
#define CG3_CR_XTAL_MASK 0x0c
#define CG3_CR_DIVISOR_MASK 0x03
/* Status Register Constants */
#define CG3_SR_PENDING_INT 0x80
#define CG3_SR_RES_MASK 0x70
#define CG3_SR_1152_900_76_A 0x40
#define CG3_SR_1152_900_76_B 0x60
#define CG3_SR_ID_MASK 0x0f
#define CG3_SR_ID_COLOR 0x01
#define CG3_SR_ID_MONO 0x02
#define CG3_SR_ID_MONO_ECL 0x03
enum cg3_type {
CG3_AT_66HZ = 0,
CG3_AT_76HZ,
CG3_RDI
};
struct cg3_regs {
struct bt_regs cmap;
volatile u8 control;
volatile u8 status;
volatile u8 cursor_start;
volatile u8 cursor_end;
volatile u8 h_blank_start;
volatile u8 h_blank_end;
volatile u8 h_sync_start;
volatile u8 h_sync_end;
volatile u8 comp_sync_end;
volatile u8 v_blank_start_high;
volatile u8 v_blank_start_low;
volatile u8 v_blank_end;
volatile u8 v_sync_start;
volatile u8 v_sync_end;
volatile u8 xfer_holdoff_start;
volatile u8 xfer_holdoff_end;
};
/* Offset of interesting structures in the OBIO space */
#define CG3_REGS_OFFSET 0x400000
#define CG3_RAM_OFFSET 0x800000
static struct sbus_mmap_map cg3_mmap_map[] = {
{ CG3_MMAP_OFFSET, CG3_RAM_OFFSET, SBUS_MMAP_FBSIZE(1) },
{ 0, 0, 0 }
};
/* The cg3 palette is loaded with 4 color values at each time */
/* so you end up with: (rgb)(r), (gb)(rg), (b)(rgb), and so on */
#define D4M3(x) ((((x)>>2)<<1) + ((x)>>2)) /* (x/4)*3 */
#define D4M4(x) ((x)&~0x3) /* (x/4)*4 */
static void cg3_loadcmap (struct fb_info_sbusfb *fb, int index, int count)
{
struct bt_regs *bt = &fb->s.cg3.regs->cmap;
u32 *i;
int steps;
i = (((u32 *)fb->color_map) + D4M3(index));
steps = D4M3(index+count-1) - D4M3(index)+3;
*(volatile u8 *)&bt->addr = (u8)D4M4(index);
while (steps--)
bt->color_map = *i++;
}
static void cg3_blank (struct fb_info_sbusfb *fb)
{
fb->s.cg3.regs->control &= ~CG3_CR_ENABLE_VIDEO;
}
static void cg3_unblank (struct fb_info_sbusfb *fb)
{
fb->s.cg3.regs->control |= CG3_CR_ENABLE_VIDEO;
}
static void cg3_margins (struct fb_info_sbusfb *fb, struct display *p, int x_margin, int y_margin)
{
p->screen_base += (y_margin - fb->y_margin) * p->line_length + (x_margin - fb->x_margin);
}
static u8 cg3regvals_66hz[] __initdata = { /* 1152 x 900, 66 Hz */
0x14, 0xbb, 0x15, 0x2b, 0x16, 0x04, 0x17, 0x14,
0x18, 0xae, 0x19, 0x03, 0x1a, 0xa8, 0x1b, 0x24,
0x1c, 0x01, 0x1d, 0x05, 0x1e, 0xff, 0x1f, 0x01,
0x10, 0x20, 0
};
static u8 cg3regvals_76hz[] __initdata = { /* 1152 x 900, 76 Hz */
0x14, 0xb7, 0x15, 0x27, 0x16, 0x03, 0x17, 0x0f,
0x18, 0xae, 0x19, 0x03, 0x1a, 0xae, 0x1b, 0x2a,
0x1c, 0x01, 0x1d, 0x09, 0x1e, 0xff, 0x1f, 0x01,
0x10, 0x24, 0
};
static u8 cg3regvals_rdi[] __initdata = { /* 640 x 480, cgRDI */
0x14, 0x70, 0x15, 0x20, 0x16, 0x08, 0x17, 0x10,
0x18, 0x06, 0x19, 0x02, 0x1a, 0x31, 0x1b, 0x51,
0x1c, 0x06, 0x1d, 0x0c, 0x1e, 0xff, 0x1f, 0x01,
0x10, 0x22, 0
};
static u8 *cg3_regvals[] __initdata = {
cg3regvals_66hz, cg3regvals_76hz, cg3regvals_rdi
};
static u_char cg3_dacvals[] __initdata = {
4, 0xff, 5, 0x00, 6, 0x70, 7, 0x00, 0
};
static char idstring[60] __initdata = { 0 };
__initfunc(char *cgthreefb_init(struct fb_info_sbusfb *fb))
{
struct fb_fix_screeninfo *fix = &fb->fix;
struct display *disp = &fb->disp;
struct fbtype *type = &fb->type;
unsigned long phys = fb->sbdp->reg_addrs[0].phys_addr;
int cgRDI = strstr(fb->sbdp->prom_name, "cgRDI") != NULL;
#ifndef FBCON_HAS_CFB8
return NULL;
#endif
if (!fb->s.cg3.regs) {
fb->s.cg3.regs = (struct cg3_regs *)sparc_alloc_io(phys+CG3_REGS_OFFSET, 0,
sizeof(struct cg3_regs), "cg3_regs", fb->iospace, 0);
if (cgRDI) {
char buffer[40];
char *p;
int ww, hh;
*buffer = 0;
prom_getstring (fb->prom_node, "params", buffer, sizeof(buffer));
if (*buffer) {
ww = simple_strtoul (buffer, &p, 10);
if (ww && *p == 'x') {
hh = simple_strtoul (p + 1, &p, 10);
if (hh && *p == '-') {
if (type->fb_width != ww || type->fb_height != hh) {
type->fb_width = ww;
type->fb_height = hh;
return SBUSFBINIT_SIZECHANGE;
}
}
}
}
}
}
strcpy(fb->info.modename, "CGthree");
strcpy(fix->id, "CGthree");
fix->line_length = fb->var.xres_virtual;
disp->scrollmode = SCROLL_YREDRAW;
if (!disp->screen_base)
disp->screen_base = (char *)sparc_alloc_io(phys+CG3_RAM_OFFSET, 0,
type->fb_size, "cg3_ram", fb->iospace, 0);
disp->screen_base += fix->line_length * fb->y_margin + fb->x_margin;
fb->dispsw = fbcon_cfb8;
fb->margins = cg3_margins;
fb->loadcmap = cg3_loadcmap;
fb->blank = cg3_blank;
fb->unblank = cg3_unblank;
fb->physbase = phys;
fb->mmap_map = cg3_mmap_map;
#ifdef __sparc_v9__
sprintf(idstring, "%s at %016lx", cgRDI ? "cgRDI" : "cgthree", phys);
#else
sprintf(idstring, "%s at %x.%08lx", cgRDI ? "cgRDI" : "cgthree", fb->iospace, phys);
#endif
if (!prom_getbool(fb->prom_node, "width")) {
/* Ugh, broken PROM didn't initialize us.
* Let's deal with this ourselves.
*/
enum cg3_type type;
u8 *p;
if (cgRDI)
type = CG3_RDI;
else {
u8 status = fb->s.cg3.regs->status, mon;
if ((status & CG3_SR_ID_MASK) == CG3_SR_ID_COLOR) {
mon = status & CG3_SR_RES_MASK;
if (mon == CG3_SR_1152_900_76_A ||
mon == CG3_SR_1152_900_76_B)
type = CG3_AT_76HZ;
else
type = CG3_AT_66HZ;
} else {
prom_printf("cgthree: can't handle SR %02x\n",
status);
prom_halt();
return NULL; /* fool gcc. */
}
}
for (p = cg3_regvals[type]; *p; p += 2)
((u8 *)fb->s.cg3.regs)[p[0]] = p[1];
for (p = cg3_dacvals; *p; p += 2) {
*(volatile u8 *)&fb->s.cg3.regs->cmap.addr = p[0];
*(volatile u8 *)&fb->s.cg3.regs->cmap.control = p[1];
}
}
return idstring;
}
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