/* * WonderMedia WM8505 Frame Buffer device driver * * Copyright (C) 2010 Ed Spiridonov * Based on vt8500lcdfb.c * * This software is licensed under the terms of the GNU General Public * License version 2, as published by the Free Software Foundation, and * may be copied, distributed, and modified under those terms. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "wm8505fb_regs.h" #include "wmt_ge_rops.h" #define DRIVER_NAME "wm8505-fb" #define to_wm8505fb_info(__info) container_of(__info, \ struct wm8505fb_info, fb) struct wm8505fb_info { struct fb_info fb; void __iomem *regbase; unsigned int contrast; }; static int wm8505fb_init_hw(struct fb_info *info) { struct wm8505fb_info *fbi = to_wm8505fb_info(info); int i; /* I know the purpose only of few registers, so clear unknown */ for (i = 0; i < 0x200; i += 4) writel(0, fbi->regbase + i); /* Set frame buffer address */ writel(fbi->fb.fix.smem_start, fbi->regbase + WMT_GOVR_FBADDR); writel(fbi->fb.fix.smem_start, fbi->regbase + WMT_GOVR_FBADDR1); /* * Set in-memory picture format to RGB * 0x31C sets the correct color mode (RGB565) for WM8650 * Bit 8+9 (0x300) are ignored on WM8505 as reserved */ writel(0x31c, fbi->regbase + WMT_GOVR_COLORSPACE); writel(1, fbi->regbase + WMT_GOVR_COLORSPACE1); /* Virtual buffer size */ writel(info->var.xres, fbi->regbase + WMT_GOVR_XRES); writel(info->var.xres_virtual, fbi->regbase + WMT_GOVR_XRES_VIRTUAL); /* black magic ;) */ writel(0xf, fbi->regbase + WMT_GOVR_FHI); writel(4, fbi->regbase + WMT_GOVR_DVO_SET); writel(1, fbi->regbase + WMT_GOVR_MIF_ENABLE); writel(1, fbi->regbase + WMT_GOVR_REG_UPDATE); return 0; } static int wm8505fb_set_timing(struct fb_info *info) { struct wm8505fb_info *fbi = to_wm8505fb_info(info); int h_start = info->var.left_margin; int h_end = h_start + info->var.xres; int h_all = h_end + info->var.right_margin; int h_sync = info->var.hsync_len; int v_start = info->var.upper_margin; int v_end = v_start + info->var.yres; int v_all = v_end + info->var.lower_margin; int v_sync = info->var.vsync_len; writel(0, fbi->regbase + WMT_GOVR_TG); writel(h_start, fbi->regbase + WMT_GOVR_TIMING_H_START); writel(h_end, fbi->regbase + WMT_GOVR_TIMING_H_END); writel(h_all, fbi->regbase + WMT_GOVR_TIMING_H_ALL); writel(h_sync, fbi->regbase + WMT_GOVR_TIMING_H_SYNC); writel(v_start, fbi->regbase + WMT_GOVR_TIMING_V_START); writel(v_end, fbi->regbase + WMT_GOVR_TIMING_V_END); writel(v_all, fbi->regbase + WMT_GOVR_TIMING_V_ALL); writel(v_sync, fbi->regbase + WMT_GOVR_TIMING_V_SYNC); writel(1, fbi->regbase + WMT_GOVR_TG); return 0; } static int wm8505fb_set_par(struct fb_info *info) { struct wm8505fb_info *fbi = to_wm8505fb_info(info); if (!fbi) return -EINVAL; if (info->var.bits_per_pixel == 32) { info->var.red.offset = 16; info->var.red.length = 8; info->var.red.msb_right = 0; info->var.green.offset = 8; info->var.green.length = 8; info->var.green.msb_right = 0; info->var.blue.offset = 0; info->var.blue.length = 8; info->var.blue.msb_right = 0; info->fix.visual = FB_VISUAL_TRUECOLOR; info->fix.line_length = info->var.xres_virtual << 2; } else if (info->var.bits_per_pixel == 16) { info->var.red.offset = 11; info->var.red.length = 5; info->var.red.msb_right = 0; info->var.green.offset = 5; info->var.green.length = 6; info->var.green.msb_right = 0; info->var.blue.offset = 0; info->var.blue.length = 5; info->var.blue.msb_right = 0; info->fix.visual = FB_VISUAL_TRUECOLOR; info->fix.line_length = info->var.xres_virtual << 1; } wm8505fb_set_timing(info); writel(fbi->contrast<<16 | fbi->contrast<<8 | fbi->contrast, fbi->regbase + WMT_GOVR_CONTRAST); return 0; } static ssize_t contrast_show(struct device *dev, struct device_attribute *attr, char *buf) { struct fb_info *info = dev_get_drvdata(dev); struct wm8505fb_info *fbi = to_wm8505fb_info(info); return sprintf(buf, "%d\n", fbi->contrast); } static ssize_t contrast_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct fb_info *info = dev_get_drvdata(dev); struct wm8505fb_info *fbi = to_wm8505fb_info(info); unsigned long tmp; if (strict_strtoul(buf, 10, &tmp) || (tmp > 0xff)) return -EINVAL; fbi->contrast = tmp; wm8505fb_set_par(info); return count; } static DEVICE_ATTR(contrast, 0644, contrast_show, contrast_store); static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf) { chan &= 0xffff; chan >>= 16 - bf->length; return chan << bf->offset; } static int wm8505fb_setcolreg(unsigned regno, unsigned red, unsigned green, unsigned blue, unsigned transp, struct fb_info *info) { struct wm8505fb_info *fbi = to_wm8505fb_info(info); int ret = 1; unsigned int val; if (regno >= 256) return -EINVAL; if (info->var.grayscale) red = green = blue = (19595 * red + 38470 * green + 7471 * blue) >> 16; switch (fbi->fb.fix.visual) { case FB_VISUAL_TRUECOLOR: if (regno < 16) { u32 *pal = info->pseudo_palette; val = chan_to_field(red, &fbi->fb.var.red); val |= chan_to_field(green, &fbi->fb.var.green); val |= chan_to_field(blue, &fbi->fb.var.blue); pal[regno] = val; ret = 0; } break; } return ret; } static int wm8505fb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info) { struct wm8505fb_info *fbi = to_wm8505fb_info(info); writel(var->xoffset, fbi->regbase + WMT_GOVR_XPAN); writel(var->yoffset, fbi->regbase + WMT_GOVR_YPAN); return 0; } static int wm8505fb_blank(int blank, struct fb_info *info) { struct wm8505fb_info *fbi = to_wm8505fb_info(info); switch (blank) { case FB_BLANK_UNBLANK: wm8505fb_set_timing(info); break; default: writel(0, fbi->regbase + WMT_GOVR_TIMING_V_SYNC); break; } return 0; } static struct fb_ops wm8505fb_ops = { .owner = THIS_MODULE, .fb_set_par = wm8505fb_set_par, .fb_setcolreg = wm8505fb_setcolreg, .fb_fillrect = wmt_ge_fillrect, .fb_copyarea = wmt_ge_copyarea, .fb_imageblit = sys_imageblit, .fb_sync = wmt_ge_sync, .fb_pan_display = wm8505fb_pan_display, .fb_blank = wm8505fb_blank, }; static int __devinit wm8505fb_probe(struct platform_device *pdev) { struct wm8505fb_info *fbi; struct resource *res; void *addr; int ret; struct fb_videomode of_mode; struct device_node *np; u32 bpp; dma_addr_t fb_mem_phys; unsigned long fb_mem_len; void *fb_mem_virt; ret = -ENOMEM; fbi = NULL; fbi = devm_kzalloc(&pdev->dev, sizeof(struct wm8505fb_info) + sizeof(u32) * 16, GFP_KERNEL); if (!fbi) { dev_err(&pdev->dev, "Failed to initialize framebuffer device\n"); ret = -ENOMEM; goto failed; } strcpy(fbi->fb.fix.id, DRIVER_NAME); fbi->fb.fix.type = FB_TYPE_PACKED_PIXELS; fbi->fb.fix.xpanstep = 1; fbi->fb.fix.ypanstep = 1; fbi->fb.fix.ywrapstep = 0; fbi->fb.fix.accel = FB_ACCEL_NONE; fbi->fb.fbops = &wm8505fb_ops; fbi->fb.flags = FBINFO_DEFAULT | FBINFO_HWACCEL_COPYAREA | FBINFO_HWACCEL_FILLRECT | FBINFO_HWACCEL_XPAN | FBINFO_HWACCEL_YPAN | FBINFO_VIRTFB | FBINFO_PARTIAL_PAN_OK; fbi->fb.node = -1; addr = fbi; addr = addr + sizeof(struct wm8505fb_info); fbi->fb.pseudo_palette = addr; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (res == NULL) { dev_err(&pdev->dev, "no I/O memory resource defined\n"); ret = -ENODEV; goto failed_fbi; } res = request_mem_region(res->start, resource_size(res), DRIVER_NAME); if (res == NULL) { dev_err(&pdev->dev, "failed to request I/O memory\n"); ret = -EBUSY; goto failed_fbi; } fbi->regbase = ioremap(res->start, resource_size(res)); if (fbi->regbase == NULL) { dev_err(&pdev->dev, "failed to map I/O memory\n"); ret = -EBUSY; goto failed_free_res; } np = of_parse_phandle(pdev->dev.of_node, "default-mode", 0); if (!np) { pr_err("%s: No display description in Device Tree\n", __func__); ret = -EINVAL; goto failed_free_res; } /* * This code is copied from Sascha Hauer's of_videomode helper * and can be replaced with a call to the helper once mainlined */ ret = 0; ret |= of_property_read_u32(np, "hactive", &of_mode.xres); ret |= of_property_read_u32(np, "vactive", &of_mode.yres); ret |= of_property_read_u32(np, "hback-porch", &of_mode.left_margin); ret |= of_property_read_u32(np, "hfront-porch", &of_mode.right_margin); ret |= of_property_read_u32(np, "hsync-len", &of_mode.hsync_len); ret |= of_property_read_u32(np, "vback-porch", &of_mode.upper_margin); ret |= of_property_read_u32(np, "vfront-porch", &of_mode.lower_margin); ret |= of_property_read_u32(np, "vsync-len", &of_mode.vsync_len); ret |= of_property_read_u32(np, "bpp", &bpp); if (ret) { pr_err("%s: Unable to read display properties\n", __func__); goto failed_free_res; } of_mode.vmode = FB_VMODE_NONINTERLACED; fb_videomode_to_var(&fbi->fb.var, &of_mode); fbi->fb.var.nonstd = 0; fbi->fb.var.activate = FB_ACTIVATE_NOW; fbi->fb.var.height = -1; fbi->fb.var.width = -1; /* try allocating the framebuffer */ fb_mem_len = of_mode.xres * of_mode.yres * 2 * (bpp / 8); fb_mem_virt = dma_alloc_coherent(&pdev->dev, fb_mem_len, &fb_mem_phys, GFP_KERNEL); if (!fb_mem_virt) { pr_err("%s: Failed to allocate framebuffer\n", __func__); return -ENOMEM; }; fbi->fb.var.xres_virtual = of_mode.xres; fbi->fb.var.yres_virtual = of_mode.yres * 2; fbi->fb.var.bits_per_pixel = bpp; fbi->fb.fix.smem_start = fb_mem_phys; fbi->fb.fix.smem_len = fb_mem_len; fbi->fb.screen_base = fb_mem_virt; fbi->fb.screen_size = fb_mem_len; if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) { dev_err(&pdev->dev, "Failed to allocate color map\n"); ret = -ENOMEM; goto failed_free_io; } wm8505fb_init_hw(&fbi->fb); fbi->contrast = 0x80; ret = wm8505fb_set_par(&fbi->fb); if (ret) { dev_err(&pdev->dev, "Failed to set parameters\n"); goto failed_free_cmap; } platform_set_drvdata(pdev, fbi); ret = register_framebuffer(&fbi->fb); if (ret < 0) { dev_err(&pdev->dev, "Failed to register framebuffer device: %d\n", ret); goto failed_free_cmap; } ret = device_create_file(&pdev->dev, &dev_attr_contrast); if (ret < 0) { printk(KERN_WARNING "fb%d: failed to register attributes (%d)\n", fbi->fb.node, ret); } printk(KERN_INFO "fb%d: %s frame buffer at 0x%lx-0x%lx\n", fbi->fb.node, fbi->fb.fix.id, fbi->fb.fix.smem_start, fbi->fb.fix.smem_start + fbi->fb.fix.smem_len - 1); return 0; failed_free_cmap: if (fbi->fb.cmap.len) fb_dealloc_cmap(&fbi->fb.cmap); failed_free_io: iounmap(fbi->regbase); failed_free_res: release_mem_region(res->start, resource_size(res)); failed_fbi: platform_set_drvdata(pdev, NULL); kfree(fbi); failed: return ret; } static int __devexit wm8505fb_remove(struct platform_device *pdev) { struct wm8505fb_info *fbi = platform_get_drvdata(pdev); struct resource *res; device_remove_file(&pdev->dev, &dev_attr_contrast); unregister_framebuffer(&fbi->fb); writel(0, fbi->regbase); if (fbi->fb.cmap.len) fb_dealloc_cmap(&fbi->fb.cmap); iounmap(fbi->regbase); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); release_mem_region(res->start, resource_size(res)); kfree(fbi); return 0; } static const struct of_device_id wmt_dt_ids[] = { { .compatible = "wm,wm8505-fb", }, {} }; static struct platform_driver wm8505fb_driver = { .probe = wm8505fb_probe, .remove = __devexit_p(wm8505fb_remove), .driver = { .owner = THIS_MODULE, .name = DRIVER_NAME, .of_match_table = of_match_ptr(wmt_dt_ids), }, }; module_platform_driver(wm8505fb_driver); MODULE_AUTHOR("Ed Spiridonov "); MODULE_DESCRIPTION("Framebuffer driver for WMT WM8505"); MODULE_LICENSE("GPL v2"); MODULE_DEVICE_TABLE(of, wmt_dt_ids);