/*
* linux/include/asm-arm/hardware/amba_clcd.h -- Integrator LCD panel.
*
* David A Rusling
*
* Copyright (C) 2001 ARM Limited
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*/
#include <linux/config.h>
#include <linux/fb.h>
/*
* CLCD Controller Internal Register addresses
*/
#define CLCD_TIM0 0x00000000
#define CLCD_TIM1 0x00000004
#define CLCD_TIM2 0x00000008
#define CLCD_TIM3 0x0000000c
#define CLCD_UBAS 0x00000010
#define CLCD_LBAS 0x00000014
#ifndef CONFIG_ARCH_VERSATILE
#define CLCD_IENB 0x00000018
#define CLCD_CNTL 0x0000001c
#else
/*
* Someone rearranged these two registers on the Versatile
* platform...
*/
#define CLCD_IENB 0x0000001c
#define CLCD_CNTL 0x00000018
#endif
#define CLCD_STAT 0x00000020
#define CLCD_INTR 0x00000024
#define CLCD_UCUR 0x00000028
#define CLCD_LCUR 0x0000002C
#define CLCD_PALL 0x00000200
#define CLCD_PALETTE 0x00000200
#define TIM2_CLKSEL (1 << 5)
#define TIM2_IVS (1 << 11)
#define TIM2_IHS (1 << 12)
#define TIM2_IPC (1 << 13)
#define TIM2_IOE (1 << 14)
#define TIM2_BCD (1 << 26)
#define CNTL_LCDEN (1 << 0)
#define CNTL_LCDBPP1 (0 << 1)
#define CNTL_LCDBPP2 (1 << 1)
#define CNTL_LCDBPP4 (2 << 1)
#define CNTL_LCDBPP8 (3 << 1)
#define CNTL_LCDBPP16 (4 << 1)
#define CNTL_LCDBPP24 (5 << 1)
#define CNTL_LCDBW (1 << 4)
#define CNTL_LCDTFT (1 << 5)
#define CNTL_LCDMONO8 (1 << 6)
#define CNTL_LCDDUAL (1 << 7)
#define CNTL_BGR (1 << 8)
#define CNTL_BEBO (1 << 9)
#define CNTL_BEPO (1 << 10)
#define CNTL_LCDPWR (1 << 11)
#define CNTL_LCDVCOMP(x) ((x) << 12)
#define CNTL_LDMAFIFOTIME (1 << 15)
#define CNTL_WATERMARK (1 << 16)
struct clcd_panel {
struct fb_videomode mode;
signed short width; /* width in mm */
signed short height; /* height in mm */
u32 tim2;
u32 tim3;
u32 cntl;
unsigned int bpp:8,
fixedtimings:1,
grayscale:1;
unsigned int connector;
};
struct clcd_regs {
u32 tim0;
u32 tim1;
u32 tim2;
u32 tim3;
u32 cntl;
unsigned long pixclock;
};
struct clcd_fb;
/*
* the board-type specific routines
*/
struct clcd_board {
const char *name;
/*
* Optional. Check whether the var structure is acceptable
* for this display.
*/
int (*check)(struct clcd_fb *fb, struct fb_var_screeninfo *var);
/*
* Compulsary. Decode fb->fb.var into regs->*. In the case of
* fixed timing, set regs->* to the register values required.
*/
void (*decode)(struct clcd_fb *fb, struct clcd_regs *regs);
/*
* Optional. Disable any extra display hardware.
*/
void (*disable)(struct clcd_fb *);
/*
* Optional. Enable any extra display hardware.
*/
void (*enable)(struct clcd_fb *);
/*
* Setup platform specific parts of CLCD driver
*/
int (*setup)(struct clcd_fb *);
/*
* mmap the framebuffer memory
*/
int (*mmap)(struct clcd_fb *, struct vm_area_struct *);
/*
* Remove platform specific parts of CLCD driver
*/
void (*remove)(struct clcd_fb *);
};
struct amba_device;
struct clk;
/* this data structure describes each frame buffer device we find */
struct clcd_fb {
struct fb_info fb;
struct amba_device *dev;
struct clk *clk;
struct clcd_panel *panel;
struct clcd_board *board;
void *board_data;
void __iomem *regs;
u32 clcd_cntl;
u32 cmap[16];
};
static inline void clcdfb_decode(struct clcd_fb *fb, struct clcd_regs *regs)
{
u32 val, cpl;
/*
* Program the CLCD controller registers and start the CLCD
*/
val = ((fb->fb.var.xres / 16) - 1) << 2;
val |= (fb->fb.var.hsync_len - 1) << 8;
val |= (fb->fb.var.right_margin - 1) << 16;
val |= (fb->fb.var.left_margin - 1) << 24;
regs->tim0 = val;
val = fb->fb.var.yres;
if (fb->panel->cntl & CNTL_LCDDUAL)
val /= 2;
val -= 1;
val |= (fb->fb.var.vsync_len - 1) << 10;
val |= fb->fb.var.lower_margin << 16;
val |= fb->fb.var.upper_margin << 24;
regs->tim1 = val;
val = fb->panel->tim2;
val |= fb->fb.var.sync & FB_SYNC_HOR_HIGH_ACT ? 0 : TIM2_IHS;
val |= fb->fb.var.sync & FB_SYNC_VERT_HIGH_ACT ? 0 : TIM2_IVS;
cpl = fb->fb.var.xres_virtual;
if (fb->panel->cntl & CNTL_LCDTFT) /* TFT */
/* / 1 */;
else if (!fb->fb.var.grayscale) /* STN color */
cpl = cpl * 8 / 3;
else if (fb->panel->cntl & CNTL_LCDMONO8) /* STN monochrome, 8bit */
cpl /= 8;
else /* STN monochrome, 4bit */
cpl /= 4;
regs->tim2 = val | ((cpl - 1) << 16);
regs->tim3 = fb->panel->tim3;
val = fb->panel->cntl;
if (fb->fb.var.grayscale)
val |= CNTL_LCDBW;
switch (fb->fb.var.bits_per_pixel) {
case 1:
val |= CNTL_LCDBPP1;
break;
case 2:
val |= CNTL_LCDBPP2;
break;
case 4:
val |= CNTL_LCDBPP4;
break;
case 8:
val |= CNTL_LCDBPP8;
break;
case 16:
val |= CNTL_LCDBPP16;
break;
case 32:
val |= CNTL_LCDBPP24;
break;
}
regs->cntl = val;
regs->pixclock = fb->fb.var.pixclock;
}
static inline int clcdfb_check(struct clcd_fb *fb, struct fb_var_screeninfo *var)
{
var->xres_virtual = var->xres = (var->xres + 15) & ~15;
var->yres_virtual = var->yres = (var->yres + 1) & ~1;
#define CHECK(e,l,h) (var->e < l || var->e > h)
if (CHECK(right_margin, (5+1), 256) || /* back porch */
CHECK(left_margin, (5+1), 256) || /* front porch */
CHECK(hsync_len, (5+1), 256) ||
var->xres > 4096 ||
var->lower_margin > 255 || /* back porch */
var->upper_margin > 255 || /* front porch */
var->vsync_len > 32 ||
var->yres > 1024)
return -EINVAL;
#undef CHECK
/* single panel mode: PCD = max(PCD, 1) */
/* dual panel mode: PCD = max(PCD, 5) */
/*
* You can't change the grayscale setting, and
* we can only do non-interlaced video.
*/
if (var->grayscale != fb->fb.var.grayscale ||
(var->vmode & FB_VMODE_MASK) != FB_VMODE_NONINTERLACED)
return -EINVAL;
#define CHECK(e) (var->e != fb->fb.var.e)
if (fb->panel->fixedtimings &&
(CHECK(xres) ||
CHECK(yres) ||
CHECK(bits_per_pixel) ||
CHECK(pixclock) ||
CHECK(left_margin) ||
CHECK(right_margin) ||
CHECK(upper_margin) ||
CHECK(lower_margin) ||
CHECK(hsync_len) ||
CHECK(vsync_len) ||
CHECK(sync)))
return -EINVAL;
#undef CHECK
var->nonstd = 0;
var->accel_flags = 0;
return 0;
}
