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![Eric Anholt](/assets/img/avatar_default.png)
We'd like to reuse these register definitions for the DRM CLCD driver, but there's a bunch of fbdev-specific code in the current header. v2: Add #ifndef guard. Signed-off-by: Eric Anholt <eric@anholt.net> Link: http://patchwork.freedesktop.org/patch/msgid/20170413031746.12921-1-eric@anholt.net
321 lines
7.9 KiB
C
321 lines
7.9 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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#include <linux/amba/clcd-regs.h>
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enum {
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/* individual formats */
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CLCD_CAP_RGB444 = (1 << 0),
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CLCD_CAP_RGB5551 = (1 << 1),
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CLCD_CAP_RGB565 = (1 << 2),
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CLCD_CAP_RGB888 = (1 << 3),
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CLCD_CAP_BGR444 = (1 << 4),
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CLCD_CAP_BGR5551 = (1 << 5),
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CLCD_CAP_BGR565 = (1 << 6),
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CLCD_CAP_BGR888 = (1 << 7),
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/* connection layouts */
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CLCD_CAP_444 = CLCD_CAP_RGB444 | CLCD_CAP_BGR444,
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CLCD_CAP_5551 = CLCD_CAP_RGB5551 | CLCD_CAP_BGR5551,
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CLCD_CAP_565 = CLCD_CAP_RGB565 | CLCD_CAP_BGR565,
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CLCD_CAP_888 = CLCD_CAP_RGB888 | CLCD_CAP_BGR888,
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/* red/blue ordering */
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CLCD_CAP_RGB = CLCD_CAP_RGB444 | CLCD_CAP_RGB5551 |
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CLCD_CAP_RGB565 | CLCD_CAP_RGB888,
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CLCD_CAP_BGR = CLCD_CAP_BGR444 | CLCD_CAP_BGR5551 |
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CLCD_CAP_BGR565 | CLCD_CAP_BGR888,
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CLCD_CAP_ALL = CLCD_CAP_BGR | CLCD_CAP_RGB,
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};
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struct backlight_device;
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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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u32 caps;
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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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struct backlight_device *backlight;
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/*
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* If the B/R lines are switched between the CLCD
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* and the panel we need to know this and not try to
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* compensate with the BGR bit in the control register.
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*/
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bool bgr_connection;
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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. Hardware capability flags.
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*/
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u32 caps;
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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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* Compulsory. 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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/**
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* struct clcd_vendor_data - holds hardware (IP-block) vendor-specific
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* variant information
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*
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* @clock_timregs: the CLCD needs to be clocked when accessing the
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* timer registers, or the hardware will hang.
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* @packed_24_bit_pixels: this variant supports 24bit packed pixel data,
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* so that RGB accesses 3 bytes at a time, not just on even 32bit
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* boundaries, packing the pixel data in memory. ST Microelectronics
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* have this.
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* @st_bitmux_control: ST Microelectronics have implemented output
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* bit line multiplexing into the CLCD control register. This indicates
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* that we need to use this.
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* @init_board: custom board init function for this variant
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* @init_panel: custom panel init function for this variant
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*/
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struct clcd_vendor_data {
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bool clock_timregs;
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bool packed_24_bit_pixels;
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bool st_bitmux_control;
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int (*init_board)(struct amba_device *adev,
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struct clcd_board *board);
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int (*init_panel)(struct clcd_fb *fb,
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struct device_node *panel);
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};
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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_vendor_data *vendor;
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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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u16 off_ienb;
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u16 off_cntl;
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u32 clcd_cntl;
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u32 cmap[16];
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bool clk_enabled;
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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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struct fb_var_screeninfo *var = &fb->fb.var;
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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 = ((var->xres / 16) - 1) << 2;
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val |= (var->hsync_len - 1) << 8;
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val |= (var->right_margin - 1) << 16;
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val |= (var->left_margin - 1) << 24;
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regs->tim0 = val;
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val = 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 |= (var->vsync_len - 1) << 10;
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val |= var->lower_margin << 16;
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val |= var->upper_margin << 24;
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regs->tim1 = val;
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val = fb->panel->tim2;
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val |= var->sync & FB_SYNC_HOR_HIGH_ACT ? 0 : TIM2_IHS;
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val |= var->sync & FB_SYNC_VERT_HIGH_ACT ? 0 : TIM2_IVS;
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cpl = 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 (!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 (var->grayscale)
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val |= CNTL_LCDBW;
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if (fb->panel->caps && fb->board->caps && var->bits_per_pixel >= 16) {
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/*
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* if board and panel supply capabilities, we can support
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* changing BGR/RGB depending on supplied parameters. Here
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* we switch to what the framebuffer is providing if need
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* be, so if the framebuffer is BGR but the display connection
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* is RGB (first case) we switch it around. Vice versa mutatis
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* mutandis if the framebuffer is RGB but the display connection
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* is BGR, we flip it around.
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*/
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if (var->red.offset == 0)
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val &= ~CNTL_BGR;
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else
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val |= CNTL_BGR;
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if (fb->panel->bgr_connection)
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val ^= CNTL_BGR;
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}
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switch (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 its
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* control register. It is possible to use 565 with
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* custom external wiring.
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*/
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if (amba_part(fb->dev) == 0x110 ||
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var->green.length == 5)
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val |= CNTL_LCDBPP16;
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else if (var->green.length == 6)
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val |= CNTL_LCDBPP16_565;
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else
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val |= CNTL_LCDBPP16_444;
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break;
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case 24:
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/* Modified variant supporting 24 bit packed pixels */
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val |= CNTL_ST_LCDBPP24_PACKED;
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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 = 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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