| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Ryan Mallon | 2878 | 97.53% | 3 | 15.00% |
| Julia Lawall | 19 | 0.64% | 1 | 5.00% |
| Damien Cassou | 11 | 0.37% | 1 | 5.00% |
| Linus Torvalds (pre-git) | 11 | 0.37% | 2 | 10.00% |
| Linus Walleij | 6 | 0.20% | 1 | 5.00% |
| H Hartley Sweeten | 5 | 0.17% | 2 | 10.00% |
| Jingoo Han | 4 | 0.14% | 1 | 5.00% |
| Alexander Sverdlin | 3 | 0.10% | 1 | 5.00% |
| Cui GaoSheng | 3 | 0.10% | 1 | 5.00% |
| Axel Lin | 3 | 0.10% | 1 | 5.00% |
| Thomas Gleixner | 2 | 0.07% | 1 | 5.00% |
| Luis R. Rodriguez | 2 | 0.07% | 1 | 5.00% |
| Linus Torvalds | 1 | 0.03% | 1 | 5.00% |
| Jani Nikula | 1 | 0.03% | 1 | 5.00% |
| Alexander A. Klimov | 1 | 0.03% | 1 | 5.00% |
| Arnd Bergmann | 1 | 0.03% | 1 | 5.00% |
| Total | 2951 | 20 |
// SPDX-License-Identifier: GPL-2.0-only /* * linux/drivers/video/ep93xx-fb.c * * Framebuffer support for the EP93xx series. * * Copyright (C) 2007 Bluewater Systems Ltd * Author: Ryan Mallon * * Copyright (c) 2009 H Hartley Sweeten <hsweeten@visionengravers.com> * * Based on the Cirrus Logic ep93xxfb driver, and various other ep93xxfb * drivers. */ #include <linux/platform_device.h> #include <linux/module.h> #include <linux/dma-mapping.h> #include <linux/slab.h> #include <linux/clk.h> #include <linux/fb.h> #include <linux/io.h> #include <linux/platform_data/video-ep93xx.h> /* Vertical Frame Timing Registers */ #define EP93XXFB_VLINES_TOTAL 0x0000 /* SW locked */ #define EP93XXFB_VSYNC 0x0004 /* SW locked */ #define EP93XXFB_VACTIVE 0x0008 /* SW locked */ #define EP93XXFB_VBLANK 0x0228 /* SW locked */ #define EP93XXFB_VCLK 0x000c /* SW locked */ /* Horizontal Frame Timing Registers */ #define EP93XXFB_HCLKS_TOTAL 0x0010 /* SW locked */ #define EP93XXFB_HSYNC 0x0014 /* SW locked */ #define EP93XXFB_HACTIVE 0x0018 /* SW locked */ #define EP93XXFB_HBLANK 0x022c /* SW locked */ #define EP93XXFB_HCLK 0x001c /* SW locked */ /* Frame Buffer Memory Configuration Registers */ #define EP93XXFB_SCREEN_PAGE 0x0028 #define EP93XXFB_SCREEN_HPAGE 0x002c #define EP93XXFB_SCREEN_LINES 0x0030 #define EP93XXFB_LINE_LENGTH 0x0034 #define EP93XXFB_VLINE_STEP 0x0038 #define EP93XXFB_LINE_CARRY 0x003c /* SW locked */ #define EP93XXFB_EOL_OFFSET 0x0230 /* Other Video Registers */ #define EP93XXFB_BRIGHTNESS 0x0020 #define EP93XXFB_ATTRIBS 0x0024 /* SW locked */ #define EP93XXFB_SWLOCK 0x007c /* SW locked */ #define EP93XXFB_AC_RATE 0x0214 #define EP93XXFB_FIFO_LEVEL 0x0234 #define EP93XXFB_PIXELMODE 0x0054 #define EP93XXFB_PIXELMODE_32BPP (0x7 << 0) #define EP93XXFB_PIXELMODE_24BPP (0x6 << 0) #define EP93XXFB_PIXELMODE_16BPP (0x4 << 0) #define EP93XXFB_PIXELMODE_8BPP (0x2 << 0) #define EP93XXFB_PIXELMODE_SHIFT_1P_24B (0x0 << 3) #define EP93XXFB_PIXELMODE_SHIFT_1P_18B (0x1 << 3) #define EP93XXFB_PIXELMODE_COLOR_LUT (0x0 << 10) #define EP93XXFB_PIXELMODE_COLOR_888 (0x4 << 10) #define EP93XXFB_PIXELMODE_COLOR_555 (0x5 << 10) #define EP93XXFB_PARL_IF_OUT 0x0058 #define EP93XXFB_PARL_IF_IN 0x005c /* Blink Control Registers */ #define EP93XXFB_BLINK_RATE 0x0040 #define EP93XXFB_BLINK_MASK 0x0044 #define EP93XXFB_BLINK_PATTRN 0x0048 #define EP93XXFB_PATTRN_MASK 0x004c #define EP93XXFB_BKGRND_OFFSET 0x0050 /* Hardware Cursor Registers */ #define EP93XXFB_CURSOR_ADR_START 0x0060 #define EP93XXFB_CURSOR_ADR_RESET 0x0064 #define EP93XXFB_CURSOR_SIZE 0x0068 #define EP93XXFB_CURSOR_COLOR1 0x006c #define EP93XXFB_CURSOR_COLOR2 0x0070 #define EP93XXFB_CURSOR_BLINK_COLOR1 0x021c #define EP93XXFB_CURSOR_BLINK_COLOR2 0x0220 #define EP93XXFB_CURSOR_XY_LOC 0x0074 #define EP93XXFB_CURSOR_DSCAN_HY_LOC 0x0078 #define EP93XXFB_CURSOR_BLINK_RATE_CTRL 0x0224 /* LUT Registers */ #define EP93XXFB_GRY_SCL_LUTR 0x0080 #define EP93XXFB_GRY_SCL_LUTG 0x0280 #define EP93XXFB_GRY_SCL_LUTB 0x0300 #define EP93XXFB_LUT_SW_CONTROL 0x0218 #define EP93XXFB_LUT_SW_CONTROL_SWTCH (1 << 0) #define EP93XXFB_LUT_SW_CONTROL_SSTAT (1 << 1) #define EP93XXFB_COLOR_LUT 0x0400 /* Video Signature Registers */ #define EP93XXFB_VID_SIG_RSLT_VAL 0x0200 #define EP93XXFB_VID_SIG_CTRL 0x0204 #define EP93XXFB_VSIG 0x0208 #define EP93XXFB_HSIG 0x020c #define EP93XXFB_SIG_CLR_STR 0x0210 /* Minimum / Maximum resolutions supported */ #define EP93XXFB_MIN_XRES 64 #define EP93XXFB_MIN_YRES 64 #define EP93XXFB_MAX_XRES 1024 #define EP93XXFB_MAX_YRES 768 struct ep93xx_fbi { struct ep93xxfb_mach_info *mach_info; struct clk *clk; struct resource *res; void __iomem *mmio_base; unsigned int pseudo_palette[256]; }; static int check_screenpage_bug = 1; module_param(check_screenpage_bug, int, 0644); MODULE_PARM_DESC(check_screenpage_bug, "Check for bit 27 screen page bug. Default = 1"); static inline unsigned int ep93xxfb_readl(struct ep93xx_fbi *fbi, unsigned int off) { return __raw_readl(fbi->mmio_base + off); } static inline void ep93xxfb_writel(struct ep93xx_fbi *fbi, unsigned int val, unsigned int off) { __raw_writel(val, fbi->mmio_base + off); } /* * Write to one of the locked raster registers. */ static inline void ep93xxfb_out_locked(struct ep93xx_fbi *fbi, unsigned int val, unsigned int reg) { /* * We don't need a lock or delay here since the raster register * block will remain unlocked until the next access. */ ep93xxfb_writel(fbi, 0xaa, EP93XXFB_SWLOCK); ep93xxfb_writel(fbi, val, reg); } static void ep93xxfb_set_video_attribs(struct fb_info *info) { struct ep93xx_fbi *fbi = info->par; unsigned int attribs; attribs = EP93XXFB_ENABLE; attribs |= fbi->mach_info->flags; ep93xxfb_out_locked(fbi, attribs, EP93XXFB_ATTRIBS); } static int ep93xxfb_set_pixelmode(struct fb_info *info) { struct ep93xx_fbi *fbi = info->par; unsigned int val; info->var.transp.offset = 0; info->var.transp.length = 0; switch (info->var.bits_per_pixel) { case 8: val = EP93XXFB_PIXELMODE_8BPP | EP93XXFB_PIXELMODE_COLOR_LUT | EP93XXFB_PIXELMODE_SHIFT_1P_18B; info->var.red.offset = 0; info->var.red.length = 8; info->var.green.offset = 0; info->var.green.length = 8; info->var.blue.offset = 0; info->var.blue.length = 8; info->fix.visual = FB_VISUAL_PSEUDOCOLOR; break; case 16: val = EP93XXFB_PIXELMODE_16BPP | EP93XXFB_PIXELMODE_COLOR_555 | EP93XXFB_PIXELMODE_SHIFT_1P_18B; info->var.red.offset = 11; info->var.red.length = 5; info->var.green.offset = 5; info->var.green.length = 6; info->var.blue.offset = 0; info->var.blue.length = 5; info->fix.visual = FB_VISUAL_TRUECOLOR; break; case 24: val = EP93XXFB_PIXELMODE_24BPP | EP93XXFB_PIXELMODE_COLOR_888 | EP93XXFB_PIXELMODE_SHIFT_1P_24B; info->var.red.offset = 16; info->var.red.length = 8; info->var.green.offset = 8; info->var.green.length = 8; info->var.blue.offset = 0; info->var.blue.length = 8; info->fix.visual = FB_VISUAL_TRUECOLOR; break; case 32: val = EP93XXFB_PIXELMODE_32BPP | EP93XXFB_PIXELMODE_COLOR_888 | EP93XXFB_PIXELMODE_SHIFT_1P_24B; info->var.red.offset = 16; info->var.red.length = 8; info->var.green.offset = 8; info->var.green.length = 8; info->var.blue.offset = 0; info->var.blue.length = 8; info->fix.visual = FB_VISUAL_TRUECOLOR; break; default: return -EINVAL; } ep93xxfb_writel(fbi, val, EP93XXFB_PIXELMODE); return 0; } static void ep93xxfb_set_timing(struct fb_info *info) { struct ep93xx_fbi *fbi = info->par; unsigned int vlines_total, hclks_total, start, stop; vlines_total = info->var.yres + info->var.upper_margin + info->var.lower_margin + info->var.vsync_len - 1; hclks_total = info->var.xres + info->var.left_margin + info->var.right_margin + info->var.hsync_len - 1; ep93xxfb_out_locked(fbi, vlines_total, EP93XXFB_VLINES_TOTAL); ep93xxfb_out_locked(fbi, hclks_total, EP93XXFB_HCLKS_TOTAL); start = vlines_total; stop = vlines_total - info->var.vsync_len; ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VSYNC); start = vlines_total - info->var.vsync_len - info->var.upper_margin; stop = info->var.lower_margin - 1; ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VBLANK); ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VACTIVE); start = vlines_total; stop = vlines_total + 1; ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VCLK); start = hclks_total; stop = hclks_total - info->var.hsync_len; ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HSYNC); start = hclks_total - info->var.hsync_len - info->var.left_margin; stop = info->var.right_margin - 1; ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HBLANK); ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HACTIVE); start = hclks_total; stop = hclks_total; ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HCLK); ep93xxfb_out_locked(fbi, 0x0, EP93XXFB_LINE_CARRY); } static int ep93xxfb_set_par(struct fb_info *info) { struct ep93xx_fbi *fbi = info->par; clk_set_rate(fbi->clk, 1000 * PICOS2KHZ(info->var.pixclock)); ep93xxfb_set_timing(info); info->fix.line_length = info->var.xres_virtual * info->var.bits_per_pixel / 8; ep93xxfb_writel(fbi, info->fix.smem_start, EP93XXFB_SCREEN_PAGE); ep93xxfb_writel(fbi, info->var.yres - 1, EP93XXFB_SCREEN_LINES); ep93xxfb_writel(fbi, ((info->var.xres * info->var.bits_per_pixel) / 32) - 1, EP93XXFB_LINE_LENGTH); ep93xxfb_writel(fbi, info->fix.line_length / 4, EP93XXFB_VLINE_STEP); ep93xxfb_set_video_attribs(info); return 0; } static int ep93xxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) { int err; err = ep93xxfb_set_pixelmode(info); if (err) return err; var->xres = max_t(unsigned int, var->xres, EP93XXFB_MIN_XRES); var->xres = min_t(unsigned int, var->xres, EP93XXFB_MAX_XRES); var->xres_virtual = max(var->xres_virtual, var->xres); var->yres = max_t(unsigned int, var->yres, EP93XXFB_MIN_YRES); var->yres = min_t(unsigned int, var->yres, EP93XXFB_MAX_YRES); var->yres_virtual = max(var->yres_virtual, var->yres); return 0; } static int ep93xxfb_mmap(struct fb_info *info, struct vm_area_struct *vma) { unsigned int offset = vma->vm_pgoff << PAGE_SHIFT; if (offset < info->fix.smem_len) { return dma_mmap_wc(info->dev, vma, info->screen_base, info->fix.smem_start, info->fix.smem_len); } return -EINVAL; } static int ep93xxfb_blank(int blank_mode, struct fb_info *info) { struct ep93xx_fbi *fbi = info->par; unsigned int attribs = ep93xxfb_readl(fbi, EP93XXFB_ATTRIBS); if (blank_mode) { if (fbi->mach_info->blank) fbi->mach_info->blank(blank_mode, info); ep93xxfb_out_locked(fbi, attribs & ~EP93XXFB_ENABLE, EP93XXFB_ATTRIBS); clk_disable(fbi->clk); } else { clk_enable(fbi->clk); ep93xxfb_out_locked(fbi, attribs | EP93XXFB_ENABLE, EP93XXFB_ATTRIBS); if (fbi->mach_info->blank) fbi->mach_info->blank(blank_mode, info); } return 0; } static inline int ep93xxfb_convert_color(int val, int width) { return ((val << width) + 0x7fff - val) >> 16; } static int ep93xxfb_setcolreg(unsigned int regno, unsigned int red, unsigned int green, unsigned int blue, unsigned int transp, struct fb_info *info) { struct ep93xx_fbi *fbi = info->par; unsigned int *pal = info->pseudo_palette; unsigned int ctrl, i, rgb, lut_current, lut_stat; switch (info->fix.visual) { case FB_VISUAL_PSEUDOCOLOR: if (regno > 255) return 1; rgb = ((red & 0xff00) << 8) | (green & 0xff00) | ((blue & 0xff00) >> 8); pal[regno] = rgb; ep93xxfb_writel(fbi, rgb, (EP93XXFB_COLOR_LUT + (regno << 2))); ctrl = ep93xxfb_readl(fbi, EP93XXFB_LUT_SW_CONTROL); lut_stat = !!(ctrl & EP93XXFB_LUT_SW_CONTROL_SSTAT); lut_current = !!(ctrl & EP93XXFB_LUT_SW_CONTROL_SWTCH); if (lut_stat == lut_current) { for (i = 0; i < 256; i++) { ep93xxfb_writel(fbi, pal[i], EP93XXFB_COLOR_LUT + (i << 2)); } ep93xxfb_writel(fbi, ctrl ^ EP93XXFB_LUT_SW_CONTROL_SWTCH, EP93XXFB_LUT_SW_CONTROL); } break; case FB_VISUAL_TRUECOLOR: if (regno > 16) return 1; red = ep93xxfb_convert_color(red, info->var.red.length); green = ep93xxfb_convert_color(green, info->var.green.length); blue = ep93xxfb_convert_color(blue, info->var.blue.length); transp = ep93xxfb_convert_color(transp, info->var.transp.length); pal[regno] = (red << info->var.red.offset) | (green << info->var.green.offset) | (blue << info->var.blue.offset) | (transp << info->var.transp.offset); break; default: return 1; } return 0; } static const struct fb_ops ep93xxfb_ops = { .owner = THIS_MODULE, .fb_check_var = ep93xxfb_check_var, .fb_set_par = ep93xxfb_set_par, .fb_blank = ep93xxfb_blank, .fb_fillrect = cfb_fillrect, .fb_copyarea = cfb_copyarea, .fb_imageblit = cfb_imageblit, .fb_setcolreg = ep93xxfb_setcolreg, .fb_mmap = ep93xxfb_mmap, }; static int ep93xxfb_alloc_videomem(struct fb_info *info) { char __iomem *virt_addr; dma_addr_t phys_addr; unsigned int fb_size; /* Maximum 16bpp -> used memory is maximum x*y*2 bytes */ fb_size = EP93XXFB_MAX_XRES * EP93XXFB_MAX_YRES * 2; virt_addr = dma_alloc_wc(info->dev, fb_size, &phys_addr, GFP_KERNEL); if (!virt_addr) return -ENOMEM; /* * There is a bug in the ep93xx framebuffer which causes problems * if bit 27 of the physical address is set. * See: https://marc.info/?l=linux-arm-kernel&m=110061245502000&w=2 * There does not seem to be any official errata for this, but I * have confirmed the problem exists on my hardware (ep9315) at * least. */ if (check_screenpage_bug && phys_addr & (1 << 27)) { dev_err(info->dev, "ep93xx framebuffer bug. phys addr (0x%x) " "has bit 27 set: cannot init framebuffer\n", phys_addr); dma_free_coherent(info->dev, fb_size, virt_addr, phys_addr); return -ENOMEM; } info->fix.smem_start = phys_addr; info->fix.smem_len = fb_size; info->screen_base = virt_addr; return 0; } static void ep93xxfb_dealloc_videomem(struct fb_info *info) { if (info->screen_base) dma_free_coherent(info->dev, info->fix.smem_len, info->screen_base, info->fix.smem_start); } static int ep93xxfb_probe(struct platform_device *pdev) { struct ep93xxfb_mach_info *mach_info = dev_get_platdata(&pdev->dev); struct fb_info *info; struct ep93xx_fbi *fbi; struct resource *res; char *video_mode; int err; if (!mach_info) return -EINVAL; info = framebuffer_alloc(sizeof(struct ep93xx_fbi), &pdev->dev); if (!info) return -ENOMEM; info->dev = &pdev->dev; platform_set_drvdata(pdev, info); fbi = info->par; fbi->mach_info = mach_info; err = fb_alloc_cmap(&info->cmap, 256, 0); if (err) goto failed_cmap; err = ep93xxfb_alloc_videomem(info); if (err) goto failed_videomem; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 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_framebuffer; dev_info(info->dev, "registered. Mode = %dx%d-%d\n", info->var.xres, info->var.yres, info->var.bits_per_pixel); return 0; failed_framebuffer: clk_disable_unprepare(fbi->clk); 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 <hsweeten@visionengravers.com"); MODULE_LICENSE("GPL");
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