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605 lines
16 KiB
605 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* linux/drivers/video/ep93xx-fb.c |
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* |
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* Framebuffer support for the EP93xx series. |
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* |
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* Copyright (C) 2007 Bluewater Systems Ltd |
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* Author: Ryan Mallon |
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* |
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* Copyright (c) 2009 H Hartley Sweeten <[email protected]> |
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* |
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* Based on the Cirrus Logic ep93xxfb driver, and various other ep93xxfb |
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* drivers. |
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*/ |
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#include <linux/platform_device.h> |
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#include <linux/module.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/slab.h> |
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#include <linux/clk.h> |
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#include <linux/fb.h> |
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#include <linux/io.h> |
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#include <linux/platform_data/video-ep93xx.h> |
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/* Vertical Frame Timing Registers */ |
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#define EP93XXFB_VLINES_TOTAL 0x0000 /* SW locked */ |
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#define EP93XXFB_VSYNC 0x0004 /* SW locked */ |
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#define EP93XXFB_VACTIVE 0x0008 /* SW locked */ |
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#define EP93XXFB_VBLANK 0x0228 /* SW locked */ |
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#define EP93XXFB_VCLK 0x000c /* SW locked */ |
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/* Horizontal Frame Timing Registers */ |
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#define EP93XXFB_HCLKS_TOTAL 0x0010 /* SW locked */ |
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#define EP93XXFB_HSYNC 0x0014 /* SW locked */ |
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#define EP93XXFB_HACTIVE 0x0018 /* SW locked */ |
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#define EP93XXFB_HBLANK 0x022c /* SW locked */ |
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#define EP93XXFB_HCLK 0x001c /* SW locked */ |
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/* Frame Buffer Memory Configuration Registers */ |
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#define EP93XXFB_SCREEN_PAGE 0x0028 |
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#define EP93XXFB_SCREEN_HPAGE 0x002c |
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#define EP93XXFB_SCREEN_LINES 0x0030 |
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#define EP93XXFB_LINE_LENGTH 0x0034 |
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#define EP93XXFB_VLINE_STEP 0x0038 |
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#define EP93XXFB_LINE_CARRY 0x003c /* SW locked */ |
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#define EP93XXFB_EOL_OFFSET 0x0230 |
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|
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/* Other Video Registers */ |
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#define EP93XXFB_BRIGHTNESS 0x0020 |
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#define EP93XXFB_ATTRIBS 0x0024 /* SW locked */ |
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#define EP93XXFB_SWLOCK 0x007c /* SW locked */ |
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#define EP93XXFB_AC_RATE 0x0214 |
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#define EP93XXFB_FIFO_LEVEL 0x0234 |
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#define EP93XXFB_PIXELMODE 0x0054 |
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#define EP93XXFB_PIXELMODE_32BPP (0x7 << 0) |
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#define EP93XXFB_PIXELMODE_24BPP (0x6 << 0) |
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#define EP93XXFB_PIXELMODE_16BPP (0x4 << 0) |
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#define EP93XXFB_PIXELMODE_8BPP (0x2 << 0) |
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#define EP93XXFB_PIXELMODE_SHIFT_1P_24B (0x0 << 3) |
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#define EP93XXFB_PIXELMODE_SHIFT_1P_18B (0x1 << 3) |
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#define EP93XXFB_PIXELMODE_COLOR_LUT (0x0 << 10) |
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#define EP93XXFB_PIXELMODE_COLOR_888 (0x4 << 10) |
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#define EP93XXFB_PIXELMODE_COLOR_555 (0x5 << 10) |
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#define EP93XXFB_PARL_IF_OUT 0x0058 |
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#define EP93XXFB_PARL_IF_IN 0x005c |
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/* Blink Control Registers */ |
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#define EP93XXFB_BLINK_RATE 0x0040 |
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#define EP93XXFB_BLINK_MASK 0x0044 |
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#define EP93XXFB_BLINK_PATTRN 0x0048 |
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#define EP93XXFB_PATTRN_MASK 0x004c |
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#define EP93XXFB_BKGRND_OFFSET 0x0050 |
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/* Hardware Cursor Registers */ |
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#define EP93XXFB_CURSOR_ADR_START 0x0060 |
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#define EP93XXFB_CURSOR_ADR_RESET 0x0064 |
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#define EP93XXFB_CURSOR_SIZE 0x0068 |
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#define EP93XXFB_CURSOR_COLOR1 0x006c |
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#define EP93XXFB_CURSOR_COLOR2 0x0070 |
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#define EP93XXFB_CURSOR_BLINK_COLOR1 0x021c |
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#define EP93XXFB_CURSOR_BLINK_COLOR2 0x0220 |
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#define EP93XXFB_CURSOR_XY_LOC 0x0074 |
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#define EP93XXFB_CURSOR_DSCAN_HY_LOC 0x0078 |
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#define EP93XXFB_CURSOR_BLINK_RATE_CTRL 0x0224 |
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|
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/* LUT Registers */ |
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#define EP93XXFB_GRY_SCL_LUTR 0x0080 |
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#define EP93XXFB_GRY_SCL_LUTG 0x0280 |
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#define EP93XXFB_GRY_SCL_LUTB 0x0300 |
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#define EP93XXFB_LUT_SW_CONTROL 0x0218 |
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#define EP93XXFB_LUT_SW_CONTROL_SWTCH (1 << 0) |
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#define EP93XXFB_LUT_SW_CONTROL_SSTAT (1 << 1) |
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#define EP93XXFB_COLOR_LUT 0x0400 |
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/* Video Signature Registers */ |
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#define EP93XXFB_VID_SIG_RSLT_VAL 0x0200 |
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#define EP93XXFB_VID_SIG_CTRL 0x0204 |
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#define EP93XXFB_VSIG 0x0208 |
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#define EP93XXFB_HSIG 0x020c |
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#define EP93XXFB_SIG_CLR_STR 0x0210 |
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/* Minimum / Maximum resolutions supported */ |
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#define EP93XXFB_MIN_XRES 64 |
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#define EP93XXFB_MIN_YRES 64 |
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#define EP93XXFB_MAX_XRES 1024 |
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#define EP93XXFB_MAX_YRES 768 |
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struct ep93xx_fbi { |
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struct ep93xxfb_mach_info *mach_info; |
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struct clk *clk; |
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struct resource *res; |
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void __iomem *mmio_base; |
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unsigned int pseudo_palette[256]; |
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}; |
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static int check_screenpage_bug = 1; |
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module_param(check_screenpage_bug, int, 0644); |
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MODULE_PARM_DESC(check_screenpage_bug, |
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"Check for bit 27 screen page bug. Default = 1"); |
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static inline unsigned int ep93xxfb_readl(struct ep93xx_fbi *fbi, |
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unsigned int off) |
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{ |
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return __raw_readl(fbi->mmio_base + off); |
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} |
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static inline void ep93xxfb_writel(struct ep93xx_fbi *fbi, |
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unsigned int val, unsigned int off) |
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{ |
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__raw_writel(val, fbi->mmio_base + off); |
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} |
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/* |
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* Write to one of the locked raster registers. |
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*/ |
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static inline void ep93xxfb_out_locked(struct ep93xx_fbi *fbi, |
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unsigned int val, unsigned int reg) |
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{ |
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/* |
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* We don't need a lock or delay here since the raster register |
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* block will remain unlocked until the next access. |
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*/ |
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ep93xxfb_writel(fbi, 0xaa, EP93XXFB_SWLOCK); |
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ep93xxfb_writel(fbi, val, reg); |
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} |
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static void ep93xxfb_set_video_attribs(struct fb_info *info) |
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{ |
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struct ep93xx_fbi *fbi = info->par; |
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unsigned int attribs; |
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attribs = EP93XXFB_ENABLE; |
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attribs |= fbi->mach_info->flags; |
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ep93xxfb_out_locked(fbi, attribs, EP93XXFB_ATTRIBS); |
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} |
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static int ep93xxfb_set_pixelmode(struct fb_info *info) |
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{ |
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struct ep93xx_fbi *fbi = info->par; |
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unsigned int val; |
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info->var.transp.offset = 0; |
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info->var.transp.length = 0; |
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switch (info->var.bits_per_pixel) { |
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case 8: |
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val = EP93XXFB_PIXELMODE_8BPP | EP93XXFB_PIXELMODE_COLOR_LUT | |
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EP93XXFB_PIXELMODE_SHIFT_1P_18B; |
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info->var.red.offset = 0; |
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info->var.red.length = 8; |
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info->var.green.offset = 0; |
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info->var.green.length = 8; |
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info->var.blue.offset = 0; |
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info->var.blue.length = 8; |
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info->fix.visual = FB_VISUAL_PSEUDOCOLOR; |
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break; |
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case 16: |
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val = EP93XXFB_PIXELMODE_16BPP | EP93XXFB_PIXELMODE_COLOR_555 | |
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EP93XXFB_PIXELMODE_SHIFT_1P_18B; |
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info->var.red.offset = 11; |
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info->var.red.length = 5; |
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info->var.green.offset = 5; |
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info->var.green.length = 6; |
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info->var.blue.offset = 0; |
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info->var.blue.length = 5; |
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info->fix.visual = FB_VISUAL_TRUECOLOR; |
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break; |
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case 24: |
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val = EP93XXFB_PIXELMODE_24BPP | EP93XXFB_PIXELMODE_COLOR_888 | |
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EP93XXFB_PIXELMODE_SHIFT_1P_24B; |
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info->var.red.offset = 16; |
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info->var.red.length = 8; |
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info->var.green.offset = 8; |
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info->var.green.length = 8; |
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info->var.blue.offset = 0; |
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info->var.blue.length = 8; |
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info->fix.visual = FB_VISUAL_TRUECOLOR; |
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break; |
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case 32: |
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val = EP93XXFB_PIXELMODE_32BPP | EP93XXFB_PIXELMODE_COLOR_888 | |
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EP93XXFB_PIXELMODE_SHIFT_1P_24B; |
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info->var.red.offset = 16; |
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info->var.red.length = 8; |
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info->var.green.offset = 8; |
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info->var.green.length = 8; |
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info->var.blue.offset = 0; |
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info->var.blue.length = 8; |
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info->fix.visual = FB_VISUAL_TRUECOLOR; |
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break; |
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default: |
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return -EINVAL; |
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} |
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ep93xxfb_writel(fbi, val, EP93XXFB_PIXELMODE); |
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return 0; |
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} |
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static void ep93xxfb_set_timing(struct fb_info *info) |
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{ |
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struct ep93xx_fbi *fbi = info->par; |
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unsigned int vlines_total, hclks_total, start, stop; |
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vlines_total = info->var.yres + info->var.upper_margin + |
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info->var.lower_margin + info->var.vsync_len - 1; |
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hclks_total = info->var.xres + info->var.left_margin + |
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info->var.right_margin + info->var.hsync_len - 1; |
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ep93xxfb_out_locked(fbi, vlines_total, EP93XXFB_VLINES_TOTAL); |
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ep93xxfb_out_locked(fbi, hclks_total, EP93XXFB_HCLKS_TOTAL); |
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start = vlines_total; |
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stop = vlines_total - info->var.vsync_len; |
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ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VSYNC); |
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start = vlines_total - info->var.vsync_len - info->var.upper_margin; |
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stop = info->var.lower_margin - 1; |
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ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VBLANK); |
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ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VACTIVE); |
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start = vlines_total; |
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stop = vlines_total + 1; |
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ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VCLK); |
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start = hclks_total; |
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stop = hclks_total - info->var.hsync_len; |
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ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HSYNC); |
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start = hclks_total - info->var.hsync_len - info->var.left_margin; |
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stop = info->var.right_margin - 1; |
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ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HBLANK); |
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ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HACTIVE); |
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start = hclks_total; |
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stop = hclks_total; |
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ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HCLK); |
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ep93xxfb_out_locked(fbi, 0x0, EP93XXFB_LINE_CARRY); |
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} |
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static int ep93xxfb_set_par(struct fb_info *info) |
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{ |
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struct ep93xx_fbi *fbi = info->par; |
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clk_set_rate(fbi->clk, 1000 * PICOS2KHZ(info->var.pixclock)); |
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ep93xxfb_set_timing(info); |
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info->fix.line_length = info->var.xres_virtual * |
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info->var.bits_per_pixel / 8; |
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ep93xxfb_writel(fbi, info->fix.smem_start, EP93XXFB_SCREEN_PAGE); |
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ep93xxfb_writel(fbi, info->var.yres - 1, EP93XXFB_SCREEN_LINES); |
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ep93xxfb_writel(fbi, ((info->var.xres * info->var.bits_per_pixel) |
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/ 32) - 1, EP93XXFB_LINE_LENGTH); |
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ep93xxfb_writel(fbi, info->fix.line_length / 4, EP93XXFB_VLINE_STEP); |
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ep93xxfb_set_video_attribs(info); |
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return 0; |
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} |
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static int ep93xxfb_check_var(struct fb_var_screeninfo *var, |
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struct fb_info *info) |
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{ |
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int err; |
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err = ep93xxfb_set_pixelmode(info); |
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if (err) |
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return err; |
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var->xres = max_t(unsigned int, var->xres, EP93XXFB_MIN_XRES); |
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var->xres = min_t(unsigned int, var->xres, EP93XXFB_MAX_XRES); |
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var->xres_virtual = max(var->xres_virtual, var->xres); |
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var->yres = max_t(unsigned int, var->yres, EP93XXFB_MIN_YRES); |
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var->yres = min_t(unsigned int, var->yres, EP93XXFB_MAX_YRES); |
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var->yres_virtual = max(var->yres_virtual, var->yres); |
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return 0; |
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} |
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static int ep93xxfb_mmap(struct fb_info *info, struct vm_area_struct *vma) |
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{ |
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unsigned int offset = vma->vm_pgoff << PAGE_SHIFT; |
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if (offset < info->fix.smem_len) { |
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return dma_mmap_wc(info->dev, vma, info->screen_base, |
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info->fix.smem_start, info->fix.smem_len); |
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} |
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return -EINVAL; |
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} |
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static int ep93xxfb_blank(int blank_mode, struct fb_info *info) |
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{ |
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struct ep93xx_fbi *fbi = info->par; |
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unsigned int attribs = ep93xxfb_readl(fbi, EP93XXFB_ATTRIBS); |
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if (blank_mode) { |
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if (fbi->mach_info->blank) |
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fbi->mach_info->blank(blank_mode, info); |
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ep93xxfb_out_locked(fbi, attribs & ~EP93XXFB_ENABLE, |
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EP93XXFB_ATTRIBS); |
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clk_disable(fbi->clk); |
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} else { |
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clk_enable(fbi->clk); |
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ep93xxfb_out_locked(fbi, attribs | EP93XXFB_ENABLE, |
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EP93XXFB_ATTRIBS); |
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if (fbi->mach_info->blank) |
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fbi->mach_info->blank(blank_mode, info); |
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} |
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return 0; |
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} |
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static inline int ep93xxfb_convert_color(int val, int width) |
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{ |
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return ((val << width) + 0x7fff - val) >> 16; |
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} |
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static int ep93xxfb_setcolreg(unsigned int regno, unsigned int red, |
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unsigned int green, unsigned int blue, |
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unsigned int transp, struct fb_info *info) |
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{ |
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struct ep93xx_fbi *fbi = info->par; |
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unsigned int *pal = info->pseudo_palette; |
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unsigned int ctrl, i, rgb, lut_current, lut_stat; |
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switch (info->fix.visual) { |
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case FB_VISUAL_PSEUDOCOLOR: |
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if (regno > 255) |
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return 1; |
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rgb = ((red & 0xff00) << 8) | (green & 0xff00) | |
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((blue & 0xff00) >> 8); |
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pal[regno] = rgb; |
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ep93xxfb_writel(fbi, rgb, (EP93XXFB_COLOR_LUT + (regno << 2))); |
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ctrl = ep93xxfb_readl(fbi, EP93XXFB_LUT_SW_CONTROL); |
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lut_stat = !!(ctrl & EP93XXFB_LUT_SW_CONTROL_SSTAT); |
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lut_current = !!(ctrl & EP93XXFB_LUT_SW_CONTROL_SWTCH); |
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if (lut_stat == lut_current) { |
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for (i = 0; i < 256; i++) { |
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ep93xxfb_writel(fbi, pal[i], |
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EP93XXFB_COLOR_LUT + (i << 2)); |
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} |
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ep93xxfb_writel(fbi, |
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ctrl ^ EP93XXFB_LUT_SW_CONTROL_SWTCH, |
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EP93XXFB_LUT_SW_CONTROL); |
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} |
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break; |
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|
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case FB_VISUAL_TRUECOLOR: |
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if (regno > 16) |
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return 1; |
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red = ep93xxfb_convert_color(red, info->var.red.length); |
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green = ep93xxfb_convert_color(green, info->var.green.length); |
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blue = ep93xxfb_convert_color(blue, info->var.blue.length); |
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transp = ep93xxfb_convert_color(transp, |
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info->var.transp.length); |
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pal[regno] = (red << info->var.red.offset) | |
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(green << info->var.green.offset) | |
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(blue << info->var.blue.offset) | |
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(transp << info->var.transp.offset); |
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break; |
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|
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default: |
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return 1; |
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} |
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return 0; |
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} |
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static const struct fb_ops ep93xxfb_ops = { |
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.owner = THIS_MODULE, |
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.fb_check_var = ep93xxfb_check_var, |
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.fb_set_par = ep93xxfb_set_par, |
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.fb_blank = ep93xxfb_blank, |
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.fb_fillrect = cfb_fillrect, |
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.fb_copyarea = cfb_copyarea, |
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.fb_imageblit = cfb_imageblit, |
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.fb_setcolreg = ep93xxfb_setcolreg, |
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.fb_mmap = ep93xxfb_mmap, |
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}; |
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static int ep93xxfb_alloc_videomem(struct fb_info *info) |
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{ |
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char __iomem *virt_addr; |
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dma_addr_t phys_addr; |
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unsigned int fb_size; |
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/* Maximum 16bpp -> used memory is maximum x*y*2 bytes */ |
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fb_size = EP93XXFB_MAX_XRES * EP93XXFB_MAX_YRES * 2; |
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virt_addr = dma_alloc_wc(info->dev, fb_size, &phys_addr, GFP_KERNEL); |
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if (!virt_addr) |
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return -ENOMEM; |
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/* |
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* There is a bug in the ep93xx framebuffer which causes problems |
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* if bit 27 of the physical address is set. |
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* See: https://marc.info/?l=linux-arm-kernel&m=110061245502000&w=2 |
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* There does not seem to be any official errata for this, but I |
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* have confirmed the problem exists on my hardware (ep9315) at |
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* least. |
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*/ |
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if (check_screenpage_bug && phys_addr & (1 << 27)) { |
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dev_err(info->dev, "ep93xx framebuffer bug. phys addr (0x%x) " |
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"has bit 27 set: cannot init framebuffer\n", |
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phys_addr); |
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dma_free_coherent(info->dev, fb_size, virt_addr, phys_addr); |
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return -ENOMEM; |
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} |
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info->fix.smem_start = phys_addr; |
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info->fix.smem_len = fb_size; |
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info->screen_base = virt_addr; |
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|
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return 0; |
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} |
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static void ep93xxfb_dealloc_videomem(struct fb_info *info) |
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{ |
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if (info->screen_base) |
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dma_free_coherent(info->dev, info->fix.smem_len, |
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info->screen_base, info->fix.smem_start); |
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} |
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static int ep93xxfb_probe(struct platform_device *pdev) |
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{ |
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struct ep93xxfb_mach_info *mach_info = dev_get_platdata(&pdev->dev); |
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struct fb_info *info; |
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struct ep93xx_fbi *fbi; |
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struct resource *res; |
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char *video_mode; |
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int err; |
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|
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if (!mach_info) |
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return -EINVAL; |
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info = framebuffer_alloc(sizeof(struct ep93xx_fbi), &pdev->dev); |
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if (!info) |
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return -ENOMEM; |
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|
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info->dev = &pdev->dev; |
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platform_set_drvdata(pdev, info); |
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fbi = info->par; |
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fbi->mach_info = mach_info; |
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|
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err = fb_alloc_cmap(&info->cmap, 256, 0); |
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if (err) |
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goto failed_cmap; |
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|
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err = ep93xxfb_alloc_videomem(info); |
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if (err) |
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goto failed_videomem; |
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|
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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if (!res) { |
|
err = -ENXIO; |
|
goto failed_resource; |
|
} |
|
|
|
/* |
|
* FIXME - We don't do a request_mem_region here because we are |
|
* sharing the register space with the backlight driver (see |
|
* drivers/video/backlight/ep93xx_bl.c) and doing so will cause |
|
* the second loaded driver to return -EBUSY. |
|
* |
|
* NOTE: No locking is required; the backlight does not touch |
|
* any of the framebuffer registers. |
|
*/ |
|
fbi->res = res; |
|
fbi->mmio_base = devm_ioremap(&pdev->dev, res->start, |
|
resource_size(res)); |
|
if (!fbi->mmio_base) { |
|
err = -ENXIO; |
|
goto failed_resource; |
|
} |
|
|
|
strcpy(info->fix.id, pdev->name); |
|
info->fbops = &ep93xxfb_ops; |
|
info->fix.type = FB_TYPE_PACKED_PIXELS; |
|
info->fix.accel = FB_ACCEL_NONE; |
|
info->var.activate = FB_ACTIVATE_NOW; |
|
info->var.vmode = FB_VMODE_NONINTERLACED; |
|
info->flags = FBINFO_DEFAULT; |
|
info->node = -1; |
|
info->state = FBINFO_STATE_RUNNING; |
|
info->pseudo_palette = &fbi->pseudo_palette; |
|
|
|
fb_get_options("ep93xx-fb", &video_mode); |
|
err = fb_find_mode(&info->var, info, video_mode, |
|
NULL, 0, NULL, 16); |
|
if (err == 0) { |
|
dev_err(info->dev, "No suitable video mode found\n"); |
|
err = -EINVAL; |
|
goto failed_resource; |
|
} |
|
|
|
if (mach_info->setup) { |
|
err = mach_info->setup(pdev); |
|
if (err) |
|
goto failed_resource; |
|
} |
|
|
|
err = ep93xxfb_check_var(&info->var, info); |
|
if (err) |
|
goto failed_check; |
|
|
|
fbi->clk = devm_clk_get(&pdev->dev, NULL); |
|
if (IS_ERR(fbi->clk)) { |
|
err = PTR_ERR(fbi->clk); |
|
fbi->clk = NULL; |
|
goto failed_check; |
|
} |
|
|
|
ep93xxfb_set_par(info); |
|
clk_prepare_enable(fbi->clk); |
|
|
|
err = register_framebuffer(info); |
|
if (err) |
|
goto failed_check; |
|
|
|
dev_info(info->dev, "registered. Mode = %dx%d-%d\n", |
|
info->var.xres, info->var.yres, info->var.bits_per_pixel); |
|
return 0; |
|
|
|
failed_check: |
|
if (fbi->mach_info->teardown) |
|
fbi->mach_info->teardown(pdev); |
|
failed_resource: |
|
ep93xxfb_dealloc_videomem(info); |
|
failed_videomem: |
|
fb_dealloc_cmap(&info->cmap); |
|
failed_cmap: |
|
kfree(info); |
|
|
|
return err; |
|
} |
|
|
|
static int ep93xxfb_remove(struct platform_device *pdev) |
|
{ |
|
struct fb_info *info = platform_get_drvdata(pdev); |
|
struct ep93xx_fbi *fbi = info->par; |
|
|
|
unregister_framebuffer(info); |
|
clk_disable_unprepare(fbi->clk); |
|
ep93xxfb_dealloc_videomem(info); |
|
fb_dealloc_cmap(&info->cmap); |
|
|
|
if (fbi->mach_info->teardown) |
|
fbi->mach_info->teardown(pdev); |
|
|
|
kfree(info); |
|
|
|
return 0; |
|
} |
|
|
|
static struct platform_driver ep93xxfb_driver = { |
|
.probe = ep93xxfb_probe, |
|
.remove = ep93xxfb_remove, |
|
.driver = { |
|
.name = "ep93xx-fb", |
|
}, |
|
}; |
|
module_platform_driver(ep93xxfb_driver); |
|
|
|
MODULE_DESCRIPTION("EP93XX Framebuffer Driver"); |
|
MODULE_ALIAS("platform:ep93xx-fb"); |
|
MODULE_AUTHOR("Ryan Mallon, " |
|
"H Hartley Sweeten <[email protected]"); |
|
MODULE_LICENSE("GPL");
|
|
|