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>

4 files changed, 400 insertions, 0 deletions

diff --git a/arch/ppc/syslib/virtex_devices.h b/arch/ppc/syslib/virtex_devices.h
index 4a17dd3927c1..3d4be1412f60 100644
--- a/arch/ppc/syslib/virtex_devices.h
+++ b/arch/ppc/syslib/virtex_devices.h
@@ -13,6 +13,13 @@
 
 #include <linux/platform_device.h>
 
+/* ML300/403 reference design framebuffer driver platform data struct */
+struct xilinxfb_platform_data {
+        u32 rotate_screen;
+        u32 screen_height_mm;
+        u32 screen_width_mm;
+};
+
 void __init virtex_early_serial_map(void);
 
 /* Prototype for device fixup routine.  Implement this routine in the
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 74d764e2e1fa..1132ba5ff391 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -1755,6 +1755,17 @@ config FB_PS3_DEFAULT_SIZE_M
           The default value can be overridden on the kernel command line
           using the "ps3fb" option (e.g. "ps3fb=9M");
 
+config FB_XILINX
+        tristate "Xilinx frame buffer support"
+        depends on FB && XILINX_VIRTEX
+        select FB_CFB_FILLRECT
+        select FB_CFB_COPYAREA
+        select FB_CFB_IMAGEBLIT
+        ---help---
+          Include support for the Xilinx ML300/ML403 reference design
+          framebuffer. ML300 carries a 640*480 LCD display on the board,
+          ML403 uses a standard DB15 VGA connector.
+
 config FB_VIRTUAL
         tristate "Virtual Frame Buffer support (ONLY FOR TESTING!)"
         depends on FB
diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index a59395d6189d..a916c204274f 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -109,6 +109,7 @@ obj-$(CONFIG_FB_PNX4008_DUM_RGB)  += pnx4008/
 obj-$(CONFIG_FB_IBM_GXT4500)      += gxt4500.o
 obj-$(CONFIG_FB_PS3)              += ps3fb.o
 obj-$(CONFIG_FB_SM501)            += sm501fb.o
+obj-$(CONFIG_FB_XILINX)           += xilinxfb.o
 
 # Platform or fallback drivers go here
 obj-$(CONFIG_FB_VESA)             += vesafb.o
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");