/* * Xilinx TFT frame buffer driver * * Author: MontaVista Software, Inc. * source@mvista.com * * 2002-2007 (c) MontaVista Software, Inc. * 2007 (c) Secret Lab Technologies, Ltd. * 2009 (c) Xilinx Inc. * * This file is licensed under the terms of the GNU General Public License * version 2. This program is licensed "as is" without any warranty of any * kind, whether express or implied. */ /* * This driver was based on au1100fb.c by MontaVista rewritten for 2.6 * by Embedded Alley Solutions <source@embeddedalley.com>, which in turn * was based on skeletonfb.c, Skeleton for a frame buffer device by * Geert Uytterhoeven. */ #include <linux/device.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/errno.h> #include <linux/string.h> #include <linux/mm.h> #include <linux/fb.h> #include <linux/init.h> #include <linux/dma-mapping.h> #include <linux/of_device.h> #include <linux/of_platform.h> #include <linux/of_address.h> #include <linux/io.h> #include <linux/xilinxfb.h> #include <linux/slab.h> #ifdef CONFIG_PPC_DCR #include <asm/dcr.h> #endif #define DRIVER_NAME "xilinxfb" /* * Xilinx calls it "PLB TFT LCD Controller" though it can also be used for * the VGA port on the Xilinx ML40x board. This is a hardware display * controller for a 640x480 resolution TFT or VGA screen. * * The interface to the framebuffer is nice and simple. There are two * control registers. The first tells the LCD interface where in memory * the frame buffer is (only the 11 most significant bits are used, so * don't start thinking about scrolling). The second allows the LCD to * be turned on or off as well as rotated 180 degrees. * * In case of direct PLB access the second control register will be at * an offset of 4 as compared to the DCR access where the offset is 1 * i.e. REG_CTRL. So this is taken care in the function * xilinx_fb_out_be32 where it left shifts the offset 2 times in case of * direct PLB access. */ #define NUM_REGS 2 #define REG_FB_ADDR 0 #define REG_CTRL 1 #define REG_CTRL_ENABLE 0x0001 #define REG_CTRL_ROTATE 0x0002 /* * The hardware only handles a single mode: 640x480 24 bit true * color. Each pixel gets a word (32 bits) of memory. Within each word, * the 8 most significant bits are ignored, the next 8 bits are the red * level, the next 8 bits are the green level and the 8 least * significant bits are the blue level. Each row of the LCD uses 1024 * words, but only the first 640 pixels are displayed with the other 384 * words being ignored. There are 480 rows. */ #define BYTES_PER_PIXEL 4 #define BITS_PER_PIXEL (BYTES_PER_PIXEL * 8) #define RED_SHIFT 16 #define GREEN_SHIFT 8 #define BLUE_SHIFT 0 #define PALETTE_ENTRIES_NO 16 /* passed to fb_alloc_cmap() */ /* * Default xilinxfb configuration */ static struct xilinxfb_platform_data xilinx_fb_default_pdata = { .xres = 640, .yres = 480, .xvirt = 1024, .yvirt = 480, }; /* * Here are the default fb_fix_screeninfo and fb_var_screeninfo structures */ static struct fb_fix_screeninfo xilinx_fb_fix = { .id = "Xilinx", .type = FB_TYPE_PACKED_PIXELS, .visual = FB_VISUAL_TRUECOLOR, .accel = FB_ACCEL_NONE }; static struct fb_var_screeninfo xilinx_fb_var = { .bits_per_pixel = BITS_PER_PIXEL, .red = { RED_SHIFT, 8, 0 }, .green = { GREEN_SHIFT, 8, 0 }, .blue = { BLUE_SHIFT, 8, 0 }, .transp = { 0, 0, 0 }, .activate = FB_ACTIVATE_NOW }; #define PLB_ACCESS_FLAG 0x1 /* 1 = PLB, 0 = DCR */ struct xilinxfb_drvdata { struct fb_info info; /* FB driver info record */ phys_addr_t regs_phys; /* phys. address of the control registers */ void __iomem *regs; /* virt. address of the control registers */ #ifdef CONFIG_PPC_DCR dcr_host_t dcr_host; unsigned int dcr_len; #endif void *fb_virt; /* virt. address of the frame buffer */ dma_addr_t fb_phys; /* phys. address of the frame buffer */ int fb_alloced; /* Flag, was the fb memory alloced? */ u8 flags; /* features of the driver */ u32 reg_ctrl_default; u32 pseudo_palette[PALETTE_ENTRIES_NO]; /* Fake palette of 16 colors */ }; #define to_xilinxfb_drvdata(_info) \ container_of(_info, struct xilinxfb_drvdata, info) /* * The XPS TFT Controller can be accessed through PLB or DCR interface. * To perform the read/write on the registers we need to check on * which bus its connected and call the appropriate write API. */ static void xilinx_fb_out_be32(struct xilinxfb_drvdata *drvdata, u32 offset, u32 val) { if (drvdata->flags & PLB_ACCESS_FLAG) out_be32(drvdata->regs + (offset << 2), val); #ifdef CONFIG_PPC_DCR else dcr_write(drvdata->dcr_host, offset, val); #endif } static int xilinx_fb_setcolreg(unsigned regno, unsigned red, unsigned green, unsigned blue, unsigned transp, struct fb_info *fbi) { u32 *palette = fbi->pseudo_palette; if (regno >= PALETTE_ENTRIES_NO) return -EINVAL; if (fbi->var.grayscale) { /* Convert color to grayscale. * grayscale = 0.30*R + 0.59*G + 0.11*B */ red = green = blue = (red * 77 + green * 151 + blue * 28 + 127) >> 8; } /* fbi->fix.visual is always FB_VISUAL_TRUECOLOR */ /* We only handle 8 bits of each color. */ red >>= 8; green >>= 8; blue >>= 8; palette[regno] = (red << RED_SHIFT) | (green << GREEN_SHIFT) | (blue << BLUE_SHIFT); return 0; } static int xilinx_fb_blank(int blank_mode, struct fb_info *fbi) { struct xilinxfb_drvdata *drvdata = to_xilinxfb_drvdata(fbi); switch (blank_mode) { case FB_BLANK_UNBLANK: /* turn on panel */ xilinx_fb_out_be32(drvdata, REG_CTRL, drvdata->reg_ctrl_default); break; case FB_BLANK_NORMAL: case FB_BLANK_VSYNC_SUSPEND: case FB_BLANK_HSYNC_SUSPEND: case FB_BLANK_POWERDOWN: /* turn off panel */ xilinx_fb_out_be32(drvdata, REG_CTRL, 0); default: break; } return 0; /* success */ } static struct fb_ops xilinxfb_ops = { .owner = THIS_MODULE, .fb_setcolreg = xilinx_fb_setcolreg, .fb_blank = xilinx_fb_blank, .fb_fillrect = cfb_fillrect, .fb_copyarea = cfb_copyarea, .fb_imageblit = cfb_imageblit, }; /* --------------------------------------------------------------------- * Bus independent setup/teardown */ static int xilinxfb_assign(struct device *dev, struct xilinxfb_drvdata *drvdata, unsigned long physaddr, struct xilinxfb_platform_data *pdata) { int rc; int fbsize = pdata->xvirt * pdata->yvirt * BYTES_PER_PIXEL; if (drvdata->flags & PLB_ACCESS_FLAG) { /* * Map the control registers in if the controller * is on direct PLB interface. */ if (!request_mem_region(physaddr, 8, DRIVER_NAME)) { dev_err(dev, "Couldn't lock memory region at 0x%08lX\n", physaddr); rc = -ENODEV; goto err_region; } drvdata->regs_phys = physaddr; drvdata->regs = ioremap(physaddr, 8); if (!drvdata->regs) { dev_err(dev, "Couldn't lock memory region at 0x%08lX\n", physaddr); rc = -ENODEV; goto err_map; } } /* Allocate the framebuffer memory */ if (pdata->fb_phys) { drvdata->fb_phys = pdata->fb_phys; drvdata->fb_virt = ioremap(pdata->fb_phys, fbsize); } else { drvdata->fb_alloced = 1; drvdata->fb_virt = dma_alloc_coherent(dev, PAGE_ALIGN(fbsize), &drvdata->fb_phys, GFP_KERNEL); } if (!drvdata->fb_virt) { dev_err(dev, "Could not allocate frame buffer memory\n"); rc = -ENOMEM; if (drvdata->flags & PLB_ACCESS_FLAG) goto err_fbmem; else goto err_region; } /* Clear (turn to black) the framebuffer */ memset_io((void __iomem *)drvdata->fb_virt, 0, fbsize); /* Tell the hardware where the frame buffer is */ xilinx_fb_out_be32(drvdata, REG_FB_ADDR, drvdata->fb_phys); /* Turn on the display */ drvdata->reg_ctrl_default = REG_CTRL_ENABLE; if (pdata->rotate_screen) drvdata->reg_ctrl_default |= REG_CTRL_ROTATE; xilinx_fb_out_be32(drvdata, REG_CTRL, drvdata->reg_ctrl_default); /* Fill struct fb_info */ drvdata->info.device = dev; drvdata->info.screen_base = (void __iomem *)drvdata->fb_virt; drvdata->info.fbops = &xilinxfb_ops; drvdata->info.fix = xilinx_fb_fix; drvdata->info.fix.smem_start = drvdata->fb_phys; drvdata->info.fix.smem_len = fbsize; drvdata->info.fix.line_length = pdata->xvirt * BYTES_PER_PIXEL; drvdata->info.pseudo_palette = drvdata->pseudo_palette; drvdata->info.flags = FBINFO_DEFAULT; drvdata->info.var = xilinx_fb_var; drvdata->info.var.height = pdata->screen_height_mm; drvdata->info.var.width = pdata->screen_width_mm; drvdata->info.var.xres = pdata->xres; drvdata->info.var.yres = pdata->yres; drvdata->info.var.xres_virtual = pdata->xvirt; drvdata->info.var.yres_virtual = pdata->yvirt; /* Allocate a colour map */ rc = fb_alloc_cmap(&drvdata->info.cmap, PALETTE_ENTRIES_NO, 0); if (rc) { dev_err(dev, "Fail to allocate colormap (%d entries)\n", PALETTE_ENTRIES_NO); goto err_cmap; } /* Register new frame buffer */ rc = register_framebuffer(&drvdata->info); if (rc) { dev_err(dev, "Could not register frame buffer\n"); goto err_regfb; } if (drvdata->flags & PLB_ACCESS_FLAG) { /* Put a banner in the log (for DEBUG) */ dev_dbg(dev, "regs: phys=%lx, virt=%p\n", physaddr, drvdata->regs); } /* Put a banner in the log (for DEBUG) */ dev_dbg(dev, "fb: phys=%llx, virt=%p, size=%x\n", (unsigned long long)drvdata->fb_phys, drvdata->fb_virt, fbsize); return 0; /* success */ err_regfb: fb_dealloc_cmap(&drvdata->info.cmap); err_cmap: if (drvdata->fb_alloced) dma_free_coherent(dev, PAGE_ALIGN(fbsize), drvdata->fb_virt, drvdata->fb_phys); else iounmap(drvdata->fb_virt); /* Turn off the display */ xilinx_fb_out_be32(drvdata, REG_CTRL, 0); err_fbmem: if (drvdata->flags & PLB_ACCESS_FLAG) iounmap(drvdata->regs); err_map: if (drvdata->flags & PLB_ACCESS_FLAG) release_mem_region(physaddr, 8); err_region: kfree(drvdata); dev_set_drvdata(dev, NULL); return rc; } static int xilinxfb_release(struct device *dev) { struct xilinxfb_drvdata *drvdata = dev_get_drvdata(dev); #if !defined(CONFIG_FRAMEBUFFER_CONSOLE) && defined(CONFIG_LOGO) xilinx_fb_blank(VESA_POWERDOWN, &drvdata->info); #endif unregister_framebuffer(&drvdata->info); fb_dealloc_cmap(&drvdata->info.cmap); if (drvdata->fb_alloced) dma_free_coherent(dev, PAGE_ALIGN(drvdata->info.fix.smem_len), drvdata->fb_virt, drvdata->fb_phys); else iounmap(drvdata->fb_virt); /* Turn off the display */ xilinx_fb_out_be32(drvdata, REG_CTRL, 0); /* Release the resources, as allocated based on interface */ if (drvdata->flags & PLB_ACCESS_FLAG) { iounmap(drvdata->regs); release_mem_region(drvdata->regs_phys, 8); } #ifdef CONFIG_PPC_DCR else dcr_unmap(drvdata->dcr_host, drvdata->dcr_len); #endif kfree(drvdata); dev_set_drvdata(dev, NULL); return 0; } /* --------------------------------------------------------------------- * OF bus binding */ static int __devinit xilinxfb_of_probe(struct platform_device *op) { const u32 *prop; u32 *p; u32 tft_access; struct xilinxfb_platform_data pdata; struct resource res; int size, rc; struct xilinxfb_drvdata *drvdata; /* Copy with the default pdata (not a ptr reference!) */ pdata = xilinx_fb_default_pdata; /* Allocate the driver data region */ drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL); if (!drvdata) { dev_err(&op->dev, "Couldn't allocate device private record\n"); return -ENOMEM; } /* * To check whether the core is connected directly to DCR or PLB * interface and initialize the tft_access accordingly. */ p = (u32 *)of_get_property(op->dev.of_node, "xlnx,dcr-splb-slave-if", NULL); tft_access = p ? *p : 0; /* * Fill the resource structure if its direct PLB interface * otherwise fill the dcr_host structure. */ if (tft_access) { drvdata->flags |= PLB_ACCESS_FLAG; rc = of_address_to_resource(op->dev.of_node, 0, &res); if (rc) { dev_err(&op->dev, "invalid address\n"); goto err; } } #ifdef CONFIG_PPC_DCR else { int start; res.start = 0; start = dcr_resource_start(op->dev.of_node, 0); drvdata->dcr_len = dcr_resource_len(op->dev.of_node, 0); drvdata->dcr_host = dcr_map(op->dev.of_node, start, drvdata->dcr_len); if (!DCR_MAP_OK(drvdata->dcr_host)) { dev_err(&op->dev, "invalid DCR address\n"); goto err; } } #endif prop = of_get_property(op->dev.of_node, "phys-size", &size); if ((prop) && (size >= sizeof(u32)*2)) { pdata.screen_width_mm = prop[0]; pdata.screen_height_mm = prop[1]; } prop = of_get_property(op->dev.of_node, "resolution", &size); if ((prop) && (size >= sizeof(u32)*2)) { pdata.xres = prop[0]; pdata.yres = prop[1]; } prop = of_get_property(op->dev.of_node, "virtual-resolution", &size); if ((prop) && (size >= sizeof(u32)*2)) { pdata.xvirt = prop[0]; pdata.yvirt = prop[1]; } if (of_find_property(op->dev.of_node, "rotate-display", NULL)) pdata.rotate_screen = 1; dev_set_drvdata(&op->dev, drvdata); return xilinxfb_assign(&op->dev, drvdata, res.start, &pdata); err: kfree(drvdata); return -ENODEV; } static int __devexit xilinxfb_of_remove(struct platform_device *op) { return xilinxfb_release(&op->dev); } /* Match table for of_platform binding */ static struct of_device_id xilinxfb_of_match[] __devinitdata = { { .compatible = "xlnx,xps-tft-1.00.a", }, { .compatible = "xlnx,xps-tft-2.00.a", }, { .compatible = "xlnx,xps-tft-2.01.a", }, { .compatible = "xlnx,plb-tft-cntlr-ref-1.00.a", }, { .compatible = "xlnx,plb-dvi-cntlr-ref-1.00.c", }, {}, }; MODULE_DEVICE_TABLE(of, xilinxfb_of_match); static struct platform_driver xilinxfb_of_driver = { .probe = xilinxfb_of_probe, .remove = __devexit_p(xilinxfb_of_remove), .driver = { .name = DRIVER_NAME, .owner = THIS_MODULE, .of_match_table = xilinxfb_of_match, }, }; module_platform_driver(xilinxfb_of_driver); MODULE_AUTHOR("MontaVista Software, Inc. <source@mvista.com>"); MODULE_DESCRIPTION("Xilinx TFT frame buffer driver"); MODULE_LICENSE("GPL");