diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/video/xilinxfb.c | 381 |
1 files changed, 381 insertions, 0 deletions
diff --git a/drivers/video/xilinxfb.c b/drivers/video/xilinxfb.c new file mode 100644 index 000000000000..1d29a89a86b4 --- /dev/null +++ b/drivers/video/xilinxfb.c @@ -0,0 +1,381 @@ +/* + * xilinxfb.c + * + * Xilinx TFT LCD frame buffer driver + * + * Author: MontaVista Software, Inc. + * source@mvista.com + * + * 2002-2007 (c) MontaVista Software, 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/module.h> +#include <linux/kernel.h> +#include <linux/version.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/platform_device.h> + +#include <asm/io.h> +#include <syslib/virtex_devices.h> + +#define DRIVER_NAME "xilinxfb" +#define DRIVER_DESCRIPTION "Xilinx TFT LCD frame buffer driver" + +/* + * 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. + */ +#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 XRES 640 +#define YRES 480 +#define XRES_VIRTUAL 1024 +#define YRES_VIRTUAL YRES +#define LINE_LENGTH (XRES_VIRTUAL * BYTES_PER_PIXEL) +#define FB_SIZE (YRES_VIRTUAL * LINE_LENGTH) + +#define RED_SHIFT 16 +#define GREEN_SHIFT 8 +#define BLUE_SHIFT 0 + +#define PALETTE_ENTRIES_NO 16 /* passed to fb_alloc_cmap() */ + +/* + * Here are the default fb_fix_screeninfo and fb_var_screeninfo structures + */ +static struct fb_fix_screeninfo xilinx_fb_fix __initdata = { + .id = "Xilinx", + .type = FB_TYPE_PACKED_PIXELS, + .visual = FB_VISUAL_TRUECOLOR, + .smem_len = FB_SIZE, + .line_length = LINE_LENGTH, + .accel = FB_ACCEL_NONE +}; + +static struct fb_var_screeninfo xilinx_fb_var __initdata = { + .xres = XRES, + .yres = YRES, + .xres_virtual = XRES_VIRTUAL, + .yres_virtual = YRES_VIRTUAL, + + .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 +}; + +struct xilinxfb_drvdata { + + struct fb_info info; /* FB driver info record */ + + u32 regs_phys; /* phys. address of the control registers */ + u32 __iomem *regs; /* virt. address of the control registers */ + + unsigned char __iomem *fb_virt; /* virt. address of the frame buffer */ + dma_addr_t fb_phys; /* phys. address of the frame buffer */ + + 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 LCD controller has DCR interface to its registers, but all + * the boards and configurations the driver has been tested with + * use opb2dcr bridge. So the registers are seen as memory mapped. + * This macro is to make it simple to add the direct DCR access + * when it's needed. + */ +#define xilinx_fb_out_be32(driverdata, offset, val) \ + out_be32(driverdata->regs + offset, val) + +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, +}; + +/* === The device driver === */ + +static int +xilinxfb_drv_probe(struct device *dev) +{ + struct platform_device *pdev; + struct xilinxfb_platform_data *pdata; + struct xilinxfb_drvdata *drvdata; + struct resource *regs_res; + int retval; + + if (!dev) + return -EINVAL; + + pdev = to_platform_device(dev); + pdata = pdev->dev.platform_data; + + if (pdata == NULL) { + printk(KERN_ERR "Couldn't find platform data.\n"); + return -EFAULT; + } + + drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL); + if (!drvdata) { + printk(KERN_ERR "Couldn't allocate device private record\n"); + return -ENOMEM; + } + dev_set_drvdata(dev, drvdata); + + /* Map the control registers in */ + regs_res = platform_get_resource(pdev, IORESOURCE_IO, 0); + if (!regs_res || (regs_res->end - regs_res->start + 1 < 8)) { + printk(KERN_ERR "Couldn't get registers resource\n"); + retval = -EFAULT; + goto failed1; + } + + if (!request_mem_region(regs_res->start, 8, DRIVER_NAME)) { + printk(KERN_ERR + "Couldn't lock memory region at 0x%08X\n", + regs_res->start); + retval = -EBUSY; + goto failed1; + } + drvdata->regs = (u32 __iomem*) ioremap(regs_res->start, 8); + drvdata->regs_phys = regs_res->start; + + /* Allocate the framebuffer memory */ + drvdata->fb_virt = dma_alloc_coherent(dev, PAGE_ALIGN(FB_SIZE), + &drvdata->fb_phys, GFP_KERNEL); + if (!drvdata->fb_virt) { + printk(KERN_ERR "Could not allocate frame buffer memory\n"); + retval = -ENOMEM; + goto failed2; + } + + /* Clear (turn to black) the framebuffer */ + memset_io((void *) drvdata->fb_virt, 0, FB_SIZE); + + /* Tell the hardware where the frame buffer is */ + xilinx_fb_out_be32(drvdata, REG_FB_ADDR, drvdata->fb_phys); + + /* Turn on the display */ + if (pdata->rotate_screen) { + drvdata->reg_ctrl_default = REG_CTRL_ENABLE | REG_CTRL_ROTATE; + } else { + drvdata->reg_ctrl_default = REG_CTRL_ENABLE; + } + xilinx_fb_out_be32(drvdata, REG_CTRL, drvdata->reg_ctrl_default); + + /* Fill struct fb_info */ + drvdata->info.device = dev; + drvdata->info.screen_base = drvdata->fb_virt; + drvdata->info.fbops = &xilinxfb_ops; + drvdata->info.fix = xilinx_fb_fix; + drvdata->info.fix.smem_start = drvdata->fb_phys; + drvdata->info.pseudo_palette = drvdata->pseudo_palette; + + if (fb_alloc_cmap(&drvdata->info.cmap, PALETTE_ENTRIES_NO, 0) < 0) { + printk(KERN_ERR "Fail to allocate colormap (%d entries)\n", + PALETTE_ENTRIES_NO); + retval = -EFAULT; + goto failed3; + } + + drvdata->info.flags = FBINFO_DEFAULT; + xilinx_fb_var.height = pdata->screen_height_mm; + xilinx_fb_var.width = pdata->screen_width_mm; + drvdata->info.var = xilinx_fb_var; + + /* Register new frame buffer */ + if (register_framebuffer(&drvdata->info) < 0) { + printk(KERN_ERR "Could not register frame buffer\n"); + retval = -EINVAL; + goto failed4; + } + + return 0; /* success */ + +failed4: + fb_dealloc_cmap(&drvdata->info.cmap); + +failed3: + dma_free_coherent(dev, PAGE_ALIGN(FB_SIZE), drvdata->fb_virt, + drvdata->fb_phys); + + /* Turn off the display */ + xilinx_fb_out_be32(drvdata, REG_CTRL, 0); + iounmap(drvdata->regs); + +failed2: + release_mem_region(regs_res->start, 8); + +failed1: + kfree(drvdata); + dev_set_drvdata(dev, NULL); + + return retval; +} + +static int +xilinxfb_drv_remove(struct device *dev) +{ + struct xilinxfb_drvdata *drvdata; + + if (!dev) + return -ENODEV; + + drvdata = (struct xilinxfb_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); + + dma_free_coherent(dev, PAGE_ALIGN(FB_SIZE), drvdata->fb_virt, + drvdata->fb_phys); + + /* Turn off the display */ + xilinx_fb_out_be32(drvdata, REG_CTRL, 0); + iounmap(drvdata->regs); + + release_mem_region(drvdata->regs_phys, 8); + + kfree(drvdata); + dev_set_drvdata(dev, NULL); + + return 0; +} + + +static struct device_driver xilinxfb_driver = { + .name = DRIVER_NAME, + .bus = &platform_bus_type, + + .probe = xilinxfb_drv_probe, + .remove = xilinxfb_drv_remove +}; + +static int __init +xilinxfb_init(void) +{ + /* + * No kernel boot options used, + * so we just need to register the driver + */ + return driver_register(&xilinxfb_driver); +} + +static void __exit +xilinxfb_cleanup(void) +{ + driver_unregister(&xilinxfb_driver); +} + +module_init(xilinxfb_init); +module_exit(xilinxfb_cleanup); + +MODULE_AUTHOR("MontaVista Software, Inc. <source@mvista.com>"); +MODULE_DESCRIPTION(DRIVER_DESCRIPTION); +MODULE_LICENSE("GPL"); |