diff options
Diffstat (limited to 'drivers/video/xilinxfb.c')
| -rw-r--r-- | drivers/video/xilinxfb.c | 527 |
1 files changed, 527 insertions, 0 deletions
diff --git a/drivers/video/xilinxfb.c b/drivers/video/xilinxfb.c new file mode 100644 index 0000000..40a3a2a --- /dev/null +++ b/drivers/video/xilinxfb.c @@ -0,0 +1,527 @@ +/* + * xilinxfb.c + * + * Xilinx TFT LCD frame buffer driver + * + * Author: MontaVista Software, Inc. + * source@mvista.com + * + * 2002-2007 (c) MontaVista Software, Inc. + * 2007 (c) Secret Lab Technologies, Ltd. + * + * 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/platform_device.h> +#if defined(CONFIG_OF) +#include <linux/of_device.h> +#include <linux/of_platform.h> +#endif +#include <asm/io.h> +#include <linux/xilinxfb.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 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 +}; + +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 */ + + 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? */ + + 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, +}; + +/* --------------------------------------------------------------------- + * Bus independent setup/teardown + */ + +static int xilinxfb_assign(struct device *dev, unsigned long physaddr, + struct xilinxfb_platform_data *pdata) +{ + struct xilinxfb_drvdata *drvdata; + int rc; + int fbsize = pdata->xvirt * pdata->yvirt * BYTES_PER_PIXEL; + + /* Allocate the driver data region */ + drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL); + if (!drvdata) { + dev_err(dev, "Couldn't allocate device private record\n"); + return -ENOMEM; + } + dev_set_drvdata(dev, drvdata); + + /* Map the control registers in */ + 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; + goto err_fbmem; + } + + /* 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; + } + + /* Put a banner in the log (for DEBUG) */ + dev_dbg(dev, "regs: phys=%lx, virt=%p\n", physaddr, drvdata->regs); + 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); + /* Turn off the display */ + xilinx_fb_out_be32(drvdata, REG_CTRL, 0); + +err_fbmem: + iounmap(drvdata->regs); + +err_map: + 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); + + /* 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; +} + +/* --------------------------------------------------------------------- + * Platform bus binding + */ + +static int +xilinxfb_platform_probe(struct platform_device *pdev) +{ + struct xilinxfb_platform_data *pdata; + struct resource *res; + + /* Find the registers address */ + res = platform_get_resource(pdev, IORESOURCE_IO, 0); + if (!res) { + dev_err(&pdev->dev, "Couldn't get registers resource\n"); + return -ENODEV; + } + + /* If a pdata structure is provided, then extract the parameters */ + pdata = &xilinx_fb_default_pdata; + if (pdev->dev.platform_data) { + pdata = pdev->dev.platform_data; + if (!pdata->xres) + pdata->xres = xilinx_fb_default_pdata.xres; + if (!pdata->yres) + pdata->yres = xilinx_fb_default_pdata.yres; + if (!pdata->xvirt) + pdata->xvirt = xilinx_fb_default_pdata.xvirt; + if (!pdata->yvirt) + pdata->yvirt = xilinx_fb_default_pdata.yvirt; + } + + return xilinxfb_assign(&pdev->dev, res->start, pdata); +} + +static int +xilinxfb_platform_remove(struct platform_device *pdev) +{ + return xilinxfb_release(&pdev->dev); +} + + +static struct platform_driver xilinxfb_platform_driver = { + .probe = xilinxfb_platform_probe, + .remove = xilinxfb_platform_remove, + .driver = { + .owner = THIS_MODULE, + .name = DRIVER_NAME, + }, +}; + +/* --------------------------------------------------------------------- + * OF bus binding + */ + +#if defined(CONFIG_OF) +static int __devinit +xilinxfb_of_probe(struct of_device *op, const struct of_device_id *match) +{ + struct resource res; + const u32 *prop; + struct xilinxfb_platform_data pdata; + int size, rc; + + /* Copy with the default pdata (not a ptr reference!) */ + pdata = xilinx_fb_default_pdata; + + dev_dbg(&op->dev, "xilinxfb_of_probe(%p, %p)\n", op, match); + + rc = of_address_to_resource(op->node, 0, &res); + if (rc) { + dev_err(&op->dev, "invalid address\n"); + return rc; + } + + prop = of_get_property(op->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->node, "resolution", &size); + if ((prop) && (size >= sizeof(u32)*2)) { + pdata.xres = prop[0]; + pdata.yres = prop[1]; + } + + prop = of_get_property(op->node, "virtual-resolution", &size); + if ((prop) && (size >= sizeof(u32)*2)) { + pdata.xvirt = prop[0]; + pdata.yvirt = prop[1]; + } + + if (of_find_property(op->node, "rotate-display", NULL)) + pdata.rotate_screen = 1; + + return xilinxfb_assign(&op->dev, res.start, &pdata); +} + +static int __devexit xilinxfb_of_remove(struct of_device *op) +{ + return xilinxfb_release(&op->dev); +} + +/* Match table for of_platform binding */ +static struct of_device_id xilinxfb_of_match[] __devinitdata = { + { .compatible = "xlnx,plb-tft-cntlr-ref-1.00.a", }, + {}, +}; +MODULE_DEVICE_TABLE(of, xilinxfb_of_match); + +static struct of_platform_driver xilinxfb_of_driver = { + .owner = THIS_MODULE, + .name = DRIVER_NAME, + .match_table = xilinxfb_of_match, + .probe = xilinxfb_of_probe, + .remove = __devexit_p(xilinxfb_of_remove), + .driver = { + .name = DRIVER_NAME, + }, +}; + +/* Registration helpers to keep the number of #ifdefs to a minimum */ +static inline int __init xilinxfb_of_register(void) +{ + pr_debug("xilinxfb: calling of_register_platform_driver()\n"); + return of_register_platform_driver(&xilinxfb_of_driver); +} + +static inline void __exit xilinxfb_of_unregister(void) +{ + of_unregister_platform_driver(&xilinxfb_of_driver); +} +#else /* CONFIG_OF */ +/* CONFIG_OF not enabled; do nothing helpers */ +static inline int __init xilinxfb_of_register(void) { return 0; } +static inline void __exit xilinxfb_of_unregister(void) { } +#endif /* CONFIG_OF */ + +/* --------------------------------------------------------------------- + * Module setup and teardown + */ + +static int __init +xilinxfb_init(void) +{ + int rc; + rc = xilinxfb_of_register(); + if (rc) + return rc; + + rc = platform_driver_register(&xilinxfb_platform_driver); + if (rc) + xilinxfb_of_unregister(); + + return rc; +} + +static void __exit +xilinxfb_cleanup(void) +{ + platform_driver_unregister(&xilinxfb_platform_driver); + xilinxfb_of_unregister(); +} + +module_init(xilinxfb_init); +module_exit(xilinxfb_cleanup); + +MODULE_AUTHOR("MontaVista Software, Inc. <source@mvista.com>"); +MODULE_DESCRIPTION(DRIVER_DESCRIPTION); +MODULE_LICENSE("GPL"); |
