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/* cg3.c: CGTHREE frame buffer driver
*
* Copyright (C) 2003, 2006 David S. Miller (davem@davemloft.net)
* 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)
*
* Driver layout based loosely on tgafb.c, see that file for credits.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/fb.h>
#include <linux/mm.h>
#include <linux/of_device.h>
#include <asm/io.h>
#include <asm/fbio.h>
#include "sbuslib.h"
/*
* Local functions.
*/
static int cg3_setcolreg(unsigned, unsigned, unsigned, unsigned,
unsigned, struct fb_info *);
static int cg3_blank(int, struct fb_info *);
static int cg3_mmap(struct fb_info *, struct vm_area_struct *);
static int cg3_ioctl(struct fb_info *, unsigned int, unsigned long);
/*
* Frame buffer operations
*/
static struct fb_ops cg3_ops = {
.owner = THIS_MODULE,
.fb_setcolreg = cg3_setcolreg,
.fb_blank = cg3_blank,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
.fb_mmap = cg3_mmap,
.fb_ioctl = cg3_ioctl,
#ifdef CONFIG_COMPAT
.fb_compat_ioctl = sbusfb_compat_ioctl,
#endif
};
/* 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 bt_regs {
u32 addr;
u32 color_map;
u32 control;
u32 cursor;
};
struct cg3_regs {
struct bt_regs cmap;
u8 control;
u8 status;
u8 cursor_start;
u8 cursor_end;
u8 h_blank_start;
u8 h_blank_end;
u8 h_sync_start;
u8 h_sync_end;
u8 comp_sync_end;
u8 v_blank_start_high;
u8 v_blank_start_low;
u8 v_blank_end;
u8 v_sync_start;
u8 v_sync_end;
u8 xfer_holdoff_start;
u8 xfer_holdoff_end;
};
/* Offset of interesting structures in the OBIO space */
#define CG3_REGS_OFFSET 0x400000UL
#define CG3_RAM_OFFSET 0x800000UL
struct cg3_par {
spinlock_t lock;
struct cg3_regs __iomem *regs;
u32 sw_cmap[((256 * 3) + 3) / 4];
u32 flags;
#define CG3_FLAG_BLANKED 0x00000001
#define CG3_FLAG_RDI 0x00000002
unsigned long which_io;
};
/**
* cg3_setcolreg - Optional function. Sets a color register.
* @regno: boolean, 0 copy local, 1 get_user() function
* @red: frame buffer colormap structure
* @green: The green value which can be up to 16 bits wide
* @blue: The blue value which can be up to 16 bits wide.
* @transp: If supported the alpha value which can be up to 16 bits wide.
* @info: frame buffer info structure
*
* 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.
* We keep a sw copy of the hw cmap to assist us in this esoteric
* loading procedure.
*/
static int cg3_setcolreg(unsigned regno,
unsigned red, unsigned green, unsigned blue,
unsigned transp, struct fb_info *info)
{
struct cg3_par *par = (struct cg3_par *) info->par;
struct bt_regs __iomem *bt = &par->regs->cmap;
unsigned long flags;
u32 *p32;
u8 *p8;
int count;
if (regno >= 256)
return 1;
red >>= 8;
green >>= 8;
blue >>= 8;
spin_lock_irqsave(&par->lock, flags);
p8 = (u8 *)par->sw_cmap + (regno * 3);
p8[0] = red;
p8[1] = green;
p8[2] = blue;
#define D4M3(x) ((((x)>>2)<<1) + ((x)>>2)) /* (x/4)*3 */
#define D4M4(x) ((x)&~0x3) /* (x/4)*4 */
count = 3;
p32 = &par->sw_cmap[D4M3(regno)];
sbus_writel(D4M4(regno), &bt->addr);
while (count--)
sbus_writel(*p32++, &bt->color_map);
#undef D4M3
#undef D4M4
spin_unlock_irqrestore(&par->lock, flags);
return 0;
}
/**
* cg3_blank - Optional function. Blanks the display.
* @blank_mode: the blank mode we want.
* @info: frame buffer structure that represents a single frame buffer
*/
static int cg3_blank(int blank, struct fb_info *info)
{
struct cg3_par *par = (struct cg3_par *) info->par;
struct cg3_regs __iomem *regs = par->regs;
unsigned long flags;
u8 val;
spin_lock_irqsave(&par->lock, flags);
switch (blank) {
case FB_BLANK_UNBLANK: /* Unblanking */
val = sbus_readb(®s->control);
val |= CG3_CR_ENABLE_VIDEO;
sbus_writeb(val, ®s->control);
par->flags &= ~CG3_FLAG_BLANKED;
break;
case FB_BLANK_NORMAL: /* Normal blanking */
case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
case FB_BLANK_POWERDOWN: /* Poweroff */
val = sbus_readb(®s->control);
val &= ~CG3_CR_ENABLE_VIDEO;
sbus_writeb(val, ®s->control);
par->flags |= CG3_FLAG_BLANKED;
break;
}
spin_unlock_irqrestore(&par->lock, flags);
return 0;
}
static struct sbus_mmap_map cg3_mmap_map[] = {
{
.voff = CG3_MMAP_OFFSET,
.poff = CG3_RAM_OFFSET,
.size = SBUS_MMAP_FBSIZE(1)
},
{ .size = 0 }
};
static int cg3_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
struct cg3_par *par = (struct cg3_par *)info->par;
return sbusfb_mmap_helper(cg3_mmap_map,
info->fix.smem_start, info->fix.smem_len,
par->which_io,
vma);
}
static int cg3_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
{
return sbusfb_ioctl_helper(cmd, arg, info,
FBTYPE_SUN3COLOR, 8, info->fix.smem_len);
}
/*
* Initialisation
*/
static void cg3_init_fix(struct fb_info *info, int linebytes,
struct device_node *dp)
{
strlcpy(info->fix.id, dp->name, sizeof(info->fix.id));
info->fix.type = FB_TYPE_PACKED_PIXELS;
info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
info->fix.line_length = linebytes;
info->fix.accel = FB_ACCEL_SUN_CGTHREE;
}
static void cg3_rdi_maybe_fixup_var(struct fb_var_screeninfo *var,
struct device_node *dp)
{
const char *params;
char *p;
int ww, hh;
params = of_get_property(dp, "params", NULL);
if (params) {
ww = simple_strtoul(params, &p, 10);
if (ww && *p == 'x') {
hh = simple_strtoul(p + 1, &p, 10);
if (hh && *p == '-') {
if (var->xres != ww ||
var->yres != hh) {
var->xres = var->xres_virtual = ww;
var->yres = var->yres_virtual = hh;
}
}
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