xilinxfb: xilinx framebuffer device driver
Add support for the video controller IP block included into Xilinx ML300 and
ML403 reference designs.
Signed-off-by: Andrei Konovalov <akonovalov@ru.mvista.com>
Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/video/xilinxfb.c b/drivers/video/xilinxfb.c
new file mode 100644
index 0000000..1d29a89
--- /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");