Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 508 insertions, 0 deletions

diff --git a/drivers/video/fbdev/xilinxfb.c b/drivers/video/fbdev/xilinxfb.c
new file mode 100644
index 000000000..8628829b4
--- /dev/null
+++ b/drivers/video/fbdev/xilinxfb.c
@@ -0,0 +1,508 @@
+/*
+ * 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 const 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 const struct fb_fix_screeninfo xilinx_fb_fix = {
+	.id =		"Xilinx",
+	.type =		FB_TYPE_PACKED_PIXELS,
+	.visual =	FB_VISUAL_TRUECOLOR,
+	.accel =	FB_ACCEL_NONE
+};
+
+static const 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 int regno, unsigned int red, unsigned int green,
+		    unsigned int blue, unsigned int 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
+		 */
+		blue = (red * 77 + green * 151 + blue * 28 + 127) >> 8;
+		green = blue;
+		red = green;
+	}
+
+	/* 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);
+	/* Endianness 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 const 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");