--- /dev/null
+/*
+ * 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/slab.h>
+
+#ifdef CONFIG_PPC_DCR
+#include <asm/dcr.h>
+#endif
+
+#define DRIVER_NAME "xilinxfb"
+
+
+/*
+ * Xilinx calls it "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 BUS 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_out32 where it left shifts the offset 2 times in case of
+ * direct BUS 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() */
+
+/* ML300/403 reference design framebuffer driver platform data struct */
+struct xilinxfb_platform_data {
+ u32 rotate_screen; /* Flag to rotate display 180 degrees */
+ u32 screen_height_mm; /* Physical dimensions of screen in mm */
+ u32 screen_width_mm;
+ u32 xres, yres; /* resolution of screen in pixels */
+ u32 xvirt, yvirt; /* resolution of memory buffer */
+
+ /* Physical address of framebuffer memory; If non-zero, driver
+ * will use provided memory address instead of allocating one from
+ * the consistent pool. */
+ u32 fb_phys;
+};
+
+/*
+ * 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 BUS_ACCESS_FLAG 0x1 /* 1 = BUS, 0 = DCR */
+#define LITTLE_ENDIAN_ACCESS 0x2 /* LITTLE ENDIAN IO functions */
+
+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 BUS 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_out32(struct xilinxfb_drvdata *drvdata, u32 offset,
+ u32 val)
+{
+ if (drvdata->flags & BUS_ACCESS_FLAG) {
+ if (drvdata->flags & LITTLE_ENDIAN_ACCESS)
+ iowrite32(val, drvdata->regs + (offset << 2));
+ else
+ iowrite32be(val, drvdata->regs + (offset << 2));
+ }
+#ifdef CONFIG_PPC_DCR
+ else
+ dcr_write(drvdata->dcr_host, offset, val);
+#endif
+}
+
+static u32 xilinx_fb_in32(struct xilinxfb_drvdata *drvdata, u32 offset)
+{
+ if (drvdata->flags & BUS_ACCESS_FLAG) {
+ if (drvdata->flags & LITTLE_ENDIAN_ACCESS)
+ return ioread32(drvdata->regs + (offset << 2));
+ else
+ return ioread32be(drvdata->regs + (offset << 2));
+ }
+#ifdef CONFIG_PPC_DCR
+ else
+ return dcr_read(drvdata->dcr_host, offset);
+#endif
+ return 0;
+}
+
+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_out32(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_out32(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 platform_device *pdev,
+ struct xilinxfb_drvdata *drvdata,
+ struct xilinxfb_platform_data *pdata)
+{
+ int rc;
+ struct device *dev = &pdev->dev;
+ int fbsize = pdata->xvirt * pdata->yvirt * BYTES_PER_PIXEL;
+
+ if (drvdata->flags & BUS_ACCESS_FLAG) {
+ struct resource *res;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ drvdata->regs = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(drvdata->regs))
+ return PTR_ERR(drvdata->regs);
+
+ drvdata->regs_phys = res->start;
+ }
+
+ /* 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");
+ return -ENOMEM;
+ }
+
+ /* 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_out32(drvdata, REG_FB_ADDR, drvdata->fb_phys);
+ rc = xilinx_fb_in32(drvdata, REG_FB_ADDR);
+ /* Endianess detection */
+ if (rc != drvdata->fb_phys) {
+ drvdata->flags |= LITTLE_ENDIAN_ACCESS;
+ xilinx_fb_out32(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_out32(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 & BUS_ACCESS_FLAG) {
+ /* Put a banner in the log (for DEBUG) */
+ dev_dbg(dev, "regs: phys=%pa, virt=%p\n",
+ &drvdata->regs_phys, 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_out32(drvdata, REG_CTRL, 0);
+
+ 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_out32(drvdata, REG_CTRL, 0);
+
+#ifdef CONFIG_PPC_DCR
+ /* Release the resources, as allocated based on interface */
+ if (!(drvdata->flags & BUS_ACCESS_FLAG))
+ dcr_unmap(drvdata->dcr_host, drvdata->dcr_len);
+#endif
+
+ return 0;
+}
+
+/* ---------------------------------------------------------------------
+ * OF bus binding
+ */
+
+static int xilinxfb_of_probe(struct platform_device *pdev)
+{
+ const u32 *prop;
+ u32 tft_access = 0;
+ struct xilinxfb_platform_data pdata;
+ int size;
+ struct xilinxfb_drvdata *drvdata;
+
+ /* Copy with the default pdata (not a ptr reference!) */
+ pdata = xilinx_fb_default_pdata;
+
+ /* Allocate the driver data region */
+ drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
+ if (!drvdata)
+ return -ENOMEM;
+
+ /*
+ * To check whether the core is connected directly to DCR or BUS
+ * interface and initialize the tft_access accordingly.
+ */
+ of_property_read_u32(pdev->dev.of_node, "xlnx,dcr-splb-slave-if",
+ &tft_access);
+
+ /*
+ * Fill the resource structure if its direct BUS interface
+ * otherwise fill the dcr_host structure.
+ */
+ if (tft_access) {
+ drvdata->flags |= BUS_ACCESS_FLAG;
+ }
+#ifdef CONFIG_PPC_DCR
+ else {
+ int start;
+ start = dcr_resource_start(pdev->dev.of_node, 0);
+ drvdata->dcr_len = dcr_resource_len(pdev->dev.of_node, 0);
+ drvdata->dcr_host = dcr_map(pdev->dev.of_node, start, drvdata->dcr_len);
+ if (!DCR_MAP_OK(drvdata->dcr_host)) {
+ dev_err(&pdev->dev, "invalid DCR address\n");
+ return -ENODEV;
+ }
+ }
+#endif
+
+ prop = of_get_property(pdev->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(pdev->dev.of_node, "resolution", &size);
+ if ((prop) && (size >= sizeof(u32)*2)) {
+ pdata.xres = prop[0];
+ pdata.yres = prop[1];
+ }
+
+ prop = of_get_property(pdev->dev.of_node, "virtual-resolution", &size);
+ if ((prop) && (size >= sizeof(u32)*2)) {
+ pdata.xvirt = prop[0];
+ pdata.yvirt = prop[1];
+ }
+
+ if (of_find_property(pdev->dev.of_node, "rotate-display", NULL))
+ pdata.rotate_screen = 1;
+
+ dev_set_drvdata(&pdev->dev, drvdata);
+ return xilinxfb_assign(pdev, drvdata, &pdata);
+}
+
+static int 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[] = {
+ { .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 = xilinxfb_of_remove,
+ .driver = {
+ .name = DRIVER_NAME,
+ .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");
Code Review / kvmfornfv.git / blobdiff