mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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281 lines
6.4 KiB
C
281 lines
6.4 KiB
C
/*
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* linux/include/asm-arm/hardware/amba_clcd.h -- Integrator LCD panel.
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*
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* David A Rusling
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*
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* Copyright (C) 2001 ARM Limited
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#include <linux/fb.h>
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/*
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* CLCD Controller Internal Register addresses
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*/
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#define CLCD_TIM0 0x00000000
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#define CLCD_TIM1 0x00000004
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#define CLCD_TIM2 0x00000008
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#define CLCD_TIM3 0x0000000c
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#define CLCD_UBAS 0x00000010
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#define CLCD_LBAS 0x00000014
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#if !defined(CONFIG_ARCH_VERSATILE) && !defined(CONFIG_ARCH_REALVIEW)
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#define CLCD_IENB 0x00000018
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#define CLCD_CNTL 0x0000001c
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#else
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/*
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* Someone rearranged these two registers on the Versatile
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* platform...
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*/
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#define CLCD_IENB 0x0000001c
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#define CLCD_CNTL 0x00000018
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#endif
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#define CLCD_STAT 0x00000020
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#define CLCD_INTR 0x00000024
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#define CLCD_UCUR 0x00000028
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#define CLCD_LCUR 0x0000002C
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#define CLCD_PALL 0x00000200
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#define CLCD_PALETTE 0x00000200
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#define TIM2_CLKSEL (1 << 5)
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#define TIM2_IVS (1 << 11)
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#define TIM2_IHS (1 << 12)
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#define TIM2_IPC (1 << 13)
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#define TIM2_IOE (1 << 14)
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#define TIM2_BCD (1 << 26)
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#define CNTL_LCDEN (1 << 0)
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#define CNTL_LCDBPP1 (0 << 1)
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#define CNTL_LCDBPP2 (1 << 1)
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#define CNTL_LCDBPP4 (2 << 1)
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#define CNTL_LCDBPP8 (3 << 1)
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#define CNTL_LCDBPP16 (4 << 1)
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#define CNTL_LCDBPP16_565 (6 << 1)
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#define CNTL_LCDBPP24 (5 << 1)
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#define CNTL_LCDBW (1 << 4)
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#define CNTL_LCDTFT (1 << 5)
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#define CNTL_LCDMONO8 (1 << 6)
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#define CNTL_LCDDUAL (1 << 7)
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#define CNTL_BGR (1 << 8)
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#define CNTL_BEBO (1 << 9)
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#define CNTL_BEPO (1 << 10)
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#define CNTL_LCDPWR (1 << 11)
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#define CNTL_LCDVCOMP(x) ((x) << 12)
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#define CNTL_LDMAFIFOTIME (1 << 15)
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#define CNTL_WATERMARK (1 << 16)
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struct clcd_panel {
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struct fb_videomode mode;
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signed short width; /* width in mm */
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signed short height; /* height in mm */
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u32 tim2;
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u32 tim3;
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u32 cntl;
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unsigned int bpp:8,
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fixedtimings:1,
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grayscale:1;
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unsigned int connector;
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};
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struct clcd_regs {
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u32 tim0;
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u32 tim1;
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u32 tim2;
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u32 tim3;
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u32 cntl;
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unsigned long pixclock;
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};
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struct clcd_fb;
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/*
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* the board-type specific routines
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*/
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struct clcd_board {
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const char *name;
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/*
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* Optional. Check whether the var structure is acceptable
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* for this display.
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*/
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int (*check)(struct clcd_fb *fb, struct fb_var_screeninfo *var);
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/*
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* Compulsary. Decode fb->fb.var into regs->*. In the case of
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* fixed timing, set regs->* to the register values required.
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*/
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void (*decode)(struct clcd_fb *fb, struct clcd_regs *regs);
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/*
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* Optional. Disable any extra display hardware.
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*/
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void (*disable)(struct clcd_fb *);
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/*
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* Optional. Enable any extra display hardware.
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*/
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void (*enable)(struct clcd_fb *);
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/*
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* Setup platform specific parts of CLCD driver
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*/
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int (*setup)(struct clcd_fb *);
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/*
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* mmap the framebuffer memory
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*/
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int (*mmap)(struct clcd_fb *, struct vm_area_struct *);
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/*
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* Remove platform specific parts of CLCD driver
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*/
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void (*remove)(struct clcd_fb *);
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};
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struct amba_device;
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struct clk;
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/* this data structure describes each frame buffer device we find */
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struct clcd_fb {
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struct fb_info fb;
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struct amba_device *dev;
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struct clk *clk;
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struct clcd_panel *panel;
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struct clcd_board *board;
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void *board_data;
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void __iomem *regs;
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u32 clcd_cntl;
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u32 cmap[16];
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};
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static inline void clcdfb_decode(struct clcd_fb *fb, struct clcd_regs *regs)
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{
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u32 val, cpl;
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/*
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* Program the CLCD controller registers and start the CLCD
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*/
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val = ((fb->fb.var.xres / 16) - 1) << 2;
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val |= (fb->fb.var.hsync_len - 1) << 8;
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val |= (fb->fb.var.right_margin - 1) << 16;
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val |= (fb->fb.var.left_margin - 1) << 24;
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regs->tim0 = val;
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val = fb->fb.var.yres;
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if (fb->panel->cntl & CNTL_LCDDUAL)
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val /= 2;
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val -= 1;
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val |= (fb->fb.var.vsync_len - 1) << 10;
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val |= fb->fb.var.lower_margin << 16;
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val |= fb->fb.var.upper_margin << 24;
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regs->tim1 = val;
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val = fb->panel->tim2;
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val |= fb->fb.var.sync & FB_SYNC_HOR_HIGH_ACT ? 0 : TIM2_IHS;
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val |= fb->fb.var.sync & FB_SYNC_VERT_HIGH_ACT ? 0 : TIM2_IVS;
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cpl = fb->fb.var.xres_virtual;
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if (fb->panel->cntl & CNTL_LCDTFT) /* TFT */
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/* / 1 */;
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else if (!fb->fb.var.grayscale) /* STN color */
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cpl = cpl * 8 / 3;
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else if (fb->panel->cntl & CNTL_LCDMONO8) /* STN monochrome, 8bit */
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cpl /= 8;
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else /* STN monochrome, 4bit */
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cpl /= 4;
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regs->tim2 = val | ((cpl - 1) << 16);
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regs->tim3 = fb->panel->tim3;
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val = fb->panel->cntl;
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if (fb->fb.var.grayscale)
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val |= CNTL_LCDBW;
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switch (fb->fb.var.bits_per_pixel) {
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case 1:
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val |= CNTL_LCDBPP1;
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break;
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case 2:
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val |= CNTL_LCDBPP2;
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break;
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case 4:
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val |= CNTL_LCDBPP4;
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break;
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case 8:
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val |= CNTL_LCDBPP8;
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break;
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case 16:
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/*
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* PL110 cannot choose between 5551 and 565 modes in
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* its control register
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*/
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if ((fb->dev->periphid & 0x000fffff) == 0x00041110)
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val |= CNTL_LCDBPP16;
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else if (fb->fb.var.green.length == 5)
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val |= CNTL_LCDBPP16;
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else
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val |= CNTL_LCDBPP16_565;
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break;
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case 32:
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val |= CNTL_LCDBPP24;
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break;
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}
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regs->cntl = val;
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regs->pixclock = fb->fb.var.pixclock;
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}
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static inline int clcdfb_check(struct clcd_fb *fb, struct fb_var_screeninfo *var)
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{
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var->xres_virtual = var->xres = (var->xres + 15) & ~15;
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var->yres_virtual = var->yres = (var->yres + 1) & ~1;
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#define CHECK(e,l,h) (var->e < l || var->e > h)
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if (CHECK(right_margin, (5+1), 256) || /* back porch */
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CHECK(left_margin, (5+1), 256) || /* front porch */
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CHECK(hsync_len, (5+1), 256) ||
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var->xres > 4096 ||
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var->lower_margin > 255 || /* back porch */
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var->upper_margin > 255 || /* front porch */
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var->vsync_len > 32 ||
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var->yres > 1024)
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return -EINVAL;
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#undef CHECK
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/* single panel mode: PCD = max(PCD, 1) */
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/* dual panel mode: PCD = max(PCD, 5) */
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/*
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* You can't change the grayscale setting, and
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* we can only do non-interlaced video.
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*/
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if (var->grayscale != fb->fb.var.grayscale ||
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(var->vmode & FB_VMODE_MASK) != FB_VMODE_NONINTERLACED)
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return -EINVAL;
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#define CHECK(e) (var->e != fb->fb.var.e)
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if (fb->panel->fixedtimings &&
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(CHECK(xres) ||
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CHECK(yres) ||
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CHECK(bits_per_pixel) ||
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CHECK(pixclock) ||
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CHECK(left_margin) ||
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CHECK(right_margin) ||
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CHECK(upper_margin) ||
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CHECK(lower_margin) ||
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CHECK(hsync_len) ||
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CHECK(vsync_len) ||
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CHECK(sync)))
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return -EINVAL;
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#undef CHECK
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var->nonstd = 0;
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var->accel_flags = 0;
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return 0;
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}
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