82235e9170
We were supporting 24bpp. However, the pixel organisation in memory was 0RGB, so it was 24bpp in 32bit words. This means we're actually supporting 32bpp and not 24bpp. Also, add a check to ensure that we don't exceed the available framebuffer when changing display resolutions. Signed-off-by: Russell King <rmk@arm.linux.org.uk>
271 lines
6.2 KiB
C
271 lines
6.2 KiB
C
/*
|
|
* 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 + 7) & ~7;
|
|
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;
|
|
}
|