Adding upstream version 6.1.76.upstream/6.1.76upstream

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

1 files changed, 1140 insertions, 0 deletions

diff --git a/drivers/video/fbdev/pvr2fb.c b/drivers/video/fbdev/pvr2fb.c
new file mode 100644
index 000000000..b73ad14ef
--- /dev/null
+++ b/drivers/video/fbdev/pvr2fb.c
@@ -0,0 +1,1140 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * drivers/video/pvr2fb.c
+ *
+ * Frame buffer and fbcon support for the NEC PowerVR2 found within the Sega
+ * Dreamcast.
+ *
+ * Copyright (c) 2001 M. R. Brown <mrbrown@0xd6.org>
+ * Copyright (c) 2001 - 2008  Paul Mundt <lethal@linux-sh.org>
+ *
+ * This driver is mostly based on the excellent amifb and vfb sources.  It uses
+ * an odd scheme for converting hardware values to/from framebuffer values,
+ * here are some hacked-up formulas:
+ *
+ *  The Dreamcast has screen offsets from each side of its four borders and
+ *  the start offsets of the display window.  I used these values to calculate
+ *  'pseudo' values (think of them as placeholders) for the fb video mode, so
+ *  that when it came time to convert these values back into their hardware
+ *  values, I could just add mode- specific offsets to get the correct mode
+ *  settings:
+ *
+ *      left_margin = diwstart_h - borderstart_h;
+ *      right_margin = borderstop_h - (diwstart_h + xres);
+ *      upper_margin = diwstart_v - borderstart_v;
+ *      lower_margin = borderstop_v - (diwstart_h + yres);
+ *
+ *      hsync_len = borderstart_h + (hsync_total - borderstop_h);
+ *      vsync_len = borderstart_v + (vsync_total - borderstop_v);
+ *
+ *  Then, when it's time to convert back to hardware settings, the only
+ *  constants are the borderstart_* offsets, all other values are derived from
+ *  the fb video mode:
+ *
+ *      // PAL
+ *      borderstart_h = 116;
+ *      borderstart_v = 44;
+ *      ...
+ *      borderstop_h = borderstart_h + hsync_total - hsync_len;
+ *      ...
+ *      diwstart_v = borderstart_v - upper_margin;
+ *
+ *  However, in the current implementation, the borderstart values haven't had
+ *  the benefit of being fully researched, so some modes may be broken.
+ */
+
+#undef DEBUG
+
+#include <linux/aperture.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/fb.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+
+#ifdef CONFIG_SH_DREAMCAST
+#include <asm/machvec.h>
+#include <mach-dreamcast/mach/sysasic.h>
+#endif
+
+#ifdef CONFIG_PVR2_DMA
+#include <linux/pagemap.h>
+#include <mach/dma.h>
+#include <asm/dma.h>
+#endif
+
+#ifdef CONFIG_SH_STORE_QUEUES
+#include <linux/uaccess.h>
+#include <cpu/sq.h>
+#endif
+
+#ifndef PCI_DEVICE_ID_NEC_NEON250
+#  define PCI_DEVICE_ID_NEC_NEON250	0x0067
+#endif
+
+/* 2D video registers */
+#define DISP_BASE	par->mmio_base
+#define DISP_BRDRCOLR (DISP_BASE + 0x40)
+#define DISP_DIWMODE (DISP_BASE + 0x44)
+#define DISP_DIWADDRL (DISP_BASE + 0x50)
+#define DISP_DIWADDRS (DISP_BASE + 0x54)
+#define DISP_DIWSIZE (DISP_BASE + 0x5c)
+#define DISP_SYNCCONF (DISP_BASE + 0xd0)
+#define DISP_BRDRHORZ (DISP_BASE + 0xd4)
+#define DISP_SYNCSIZE (DISP_BASE + 0xd8)
+#define DISP_BRDRVERT (DISP_BASE + 0xdc)
+#define DISP_DIWCONF (DISP_BASE + 0xe8)
+#define DISP_DIWHSTRT (DISP_BASE + 0xec)
+#define DISP_DIWVSTRT (DISP_BASE + 0xf0)
+#define DISP_PIXDEPTH (DISP_BASE + 0x108)
+
+/* Pixel clocks, one for TV output, doubled for VGA output */
+#define TV_CLK 74239
+#define VGA_CLK 37119
+
+/* This is for 60Hz - the VTOTAL is doubled for interlaced modes */
+#define PAL_HTOTAL 863
+#define PAL_VTOTAL 312
+#define NTSC_HTOTAL 857
+#define NTSC_VTOTAL 262
+
+/* Supported cable types */
+enum { CT_VGA, CT_NONE, CT_RGB, CT_COMPOSITE };
+
+/* Supported video output types */
+enum { VO_PAL, VO_NTSC, VO_VGA };
+
+/* Supported palette types */
+enum { PAL_ARGB1555, PAL_RGB565, PAL_ARGB4444, PAL_ARGB8888 };
+
+struct pvr2_params { unsigned int val; char *name; };
+static struct pvr2_params cables[] = {
+	{ CT_VGA, "VGA" }, { CT_RGB, "RGB" }, { CT_COMPOSITE, "COMPOSITE" },
+};
+
+static struct pvr2_params outputs[] = {
+	{ VO_PAL, "PAL" }, { VO_NTSC, "NTSC" }, { VO_VGA, "VGA" },
+};
+
+/*
+ * This describes the current video mode
+ */
+
+static struct pvr2fb_par {
+	unsigned int hsync_total;	/* Clocks/line */
+	unsigned int vsync_total;	/* Lines/field */
+	unsigned int borderstart_h;
+	unsigned int borderstop_h;
+	unsigned int borderstart_v;
+	unsigned int borderstop_v;
+	unsigned int diwstart_h;	/* Horizontal offset of the display field */
+	unsigned int diwstart_v;	/* Vertical offset of the display field, for
+				   interlaced modes, this is the long field */
+	unsigned long disp_start;	/* Address of image within VRAM */
+	unsigned char is_interlaced;	/* Is the display interlaced? */
+	unsigned char is_doublescan;	/* Are scanlines output twice? (doublescan) */
+	unsigned char is_lowres;	/* Is horizontal pixel-doubling enabled? */
+
+	void __iomem *mmio_base;	/* MMIO base */
+	u32 palette[16];
+} *currentpar;
+
+static struct fb_info *fb_info;
+
+static struct fb_fix_screeninfo pvr2_fix = {
+	.id =		"NEC PowerVR2",
+	.type =		FB_TYPE_PACKED_PIXELS,
+	.visual =	FB_VISUAL_TRUECOLOR,
+	.ypanstep =	1,
+	.ywrapstep =	1,
+	.accel =	FB_ACCEL_NONE,
+};
+
+static const struct fb_var_screeninfo pvr2_var = {
+	.xres =		640,
+	.yres =		480,
+	.xres_virtual =	640,
+	.yres_virtual = 480,
+	.bits_per_pixel	=16,
+	.red =		{ 11, 5, 0 },
+	.green =	{  5, 6, 0 },
+	.blue =		{  0, 5, 0 },
+	.activate =	FB_ACTIVATE_NOW,
+	.height =	-1,
+	.width =	-1,
+	.vmode =	FB_VMODE_NONINTERLACED,
+};
+
+static int cable_type = CT_VGA;
+static int video_output = VO_VGA;
+
+static int nopan = 0;
+static int nowrap = 1;
+
+/*
+ * We do all updating, blanking, etc. during the vertical retrace period
+ */
+static unsigned int do_vmode_full = 0;	/* Change the video mode */
+static unsigned int do_vmode_pan = 0;	/* Update the video mode */
+static short do_blank = 0;		/* (Un)Blank the screen */
+
+static unsigned int is_blanked = 0;		/* Is the screen blanked? */
+
+#ifdef CONFIG_SH_STORE_QUEUES
+static unsigned long pvr2fb_map;
+#endif
+
+#ifdef CONFIG_PVR2_DMA
+static unsigned int shdma = PVR2_CASCADE_CHAN;
+static unsigned int pvr2dma = ONCHIP_NR_DMA_CHANNELS;
+#endif
+
+static struct fb_videomode pvr2_modedb[] = {
+    /*
+     * Broadcast video modes (PAL and NTSC).  I'm unfamiliar with
+     * PAL-M and PAL-N, but from what I've read both modes parallel PAL and
+     * NTSC, so it shouldn't be a problem (I hope).
+     */
+
+    {
+	/* 640x480 @ 60Hz interlaced (NTSC) */
+	"ntsc_640x480i", 60, 640, 480, TV_CLK, 38, 33, 0, 18, 146, 26,
+	FB_SYNC_BROADCAST, FB_VMODE_INTERLACED | FB_VMODE_YWRAP
+    }, {
+	/* 640x240 @ 60Hz (NTSC) */
+	/* XXX: Broken! Don't use... */
+	"ntsc_640x240", 60, 640, 240, TV_CLK, 38, 33, 0, 0, 146, 22,
+	FB_SYNC_BROADCAST, FB_VMODE_YWRAP
+    }, {
+	/* 640x480 @ 60hz (VGA) */
+	"vga_640x480", 60, 640, 480, VGA_CLK, 38, 33, 0, 18, 146, 26,
+	0, FB_VMODE_YWRAP
+    },
+};
+
+#define NUM_TOTAL_MODES  ARRAY_SIZE(pvr2_modedb)
+
+#define DEFMODE_NTSC	0
+#define DEFMODE_PAL	0
+#define DEFMODE_VGA	2
+
+static int defmode = DEFMODE_NTSC;
+static char *mode_option = NULL;
+
+static inline void pvr2fb_set_pal_type(unsigned int type)
+{
+	struct pvr2fb_par *par = (struct pvr2fb_par *)fb_info->par;
+
+	fb_writel(type, par->mmio_base + 0x108);
+}
+
+static inline void pvr2fb_set_pal_entry(struct pvr2fb_par *par,
+					unsigned int regno,
+					unsigned int val)
+{
+	fb_writel(val, par->mmio_base + 0x1000 + (4 * regno));
+}
+
+static int pvr2fb_blank(int blank, struct fb_info *info)
+{
+	do_blank = blank ? blank : -1;
+	return 0;
+}
+
+static inline unsigned long get_line_length(int xres_virtual, int bpp)
+{
+	return (unsigned long)((((xres_virtual*bpp)+31)&~31) >> 3);
+}
+
+static void set_color_bitfields(struct fb_var_screeninfo *var)
+{
+	switch (var->bits_per_pixel) {
+	    case 16:        /* RGB 565 */
+		pvr2fb_set_pal_type(PAL_RGB565);
+		var->red.offset = 11;    var->red.length = 5;
+		var->green.offset = 5;   var->green.length = 6;
+		var->blue.offset = 0;    var->blue.length = 5;
+		var->transp.offset = 0;  var->transp.length = 0;
+		break;
+	    case 24:        /* RGB 888 */
+		var->red.offset = 16;    var->red.length = 8;
+		var->green.offset = 8;   var->green.length = 8;
+		var->blue.offset = 0;    var->blue.length = 8;
+		var->transp.offset = 0;  var->transp.length = 0;
+		break;
+	    case 32:        /* ARGB 8888 */
+		pvr2fb_set_pal_type(PAL_ARGB8888);
+		var->red.offset = 16;    var->red.length = 8;
+		var->green.offset = 8;   var->green.length = 8;
+		var->blue.offset = 0;    var->blue.length = 8;
+		var->transp.offset = 24; var->transp.length = 8;
+		break;
+	}
+}
+
+static int pvr2fb_setcolreg(unsigned int regno, unsigned int red,
+			    unsigned int green, unsigned int blue,
+                            unsigned int transp, struct fb_info *info)
+{
+	struct pvr2fb_par *par = (struct pvr2fb_par *)info->par;
+	unsigned int tmp;
+
+	if (regno > info->cmap.len)
+		return 1;
+
+	/*
+	 * We only support the hardware palette for 16 and 32bpp. It's also
+	 * expected that the palette format has been set by the time we get
+	 * here, so we don't waste time setting it again.
+	 */
+	switch (info->var.bits_per_pixel) {
+	    case 16: /* RGB 565 */
+		tmp =  (red   & 0xf800)       |
+		      ((green & 0xfc00) >> 5) |
+		      ((blue  & 0xf800) >> 11);
+
+		pvr2fb_set_pal_entry(par, regno, tmp);
+		break;
+	    case 24: /* RGB 888 */
+		red >>= 8; green >>= 8; blue >>= 8;
+		tmp = (red << 16) | (green << 8) | blue;
+		break;
+	    case 32: /* ARGB 8888 */
+		red >>= 8; green >>= 8; blue >>= 8;
+		tmp = (transp << 24) | (red << 16) | (green << 8) | blue;
+
+		pvr2fb_set_pal_entry(par, regno, tmp);
+		break;
+	    default:
+		pr_debug("Invalid bit depth %d?!?\n", info->var.bits_per_pixel);
+		return 1;
+	}
+
+	if (regno < 16)
+		((u32*)(info->pseudo_palette))[regno] = tmp;
+
+	return 0;
+}
+
+/*
+ * Determine the cable type and initialize the cable output format.  Don't do
+ * anything if the cable type has been overidden (via "cable:XX").
+ */
+
+#define PCTRA ((void __iomem *)0xff80002c)
+#define PDTRA ((void __iomem *)0xff800030)
+#define VOUTC ((void __iomem *)0xa0702c00)
+
+static int pvr2_init_cable(void)
+{
+	if (cable_type < 0) {
+		fb_writel((fb_readl(PCTRA) & 0xfff0ffff) | 0x000a0000,
+	                  PCTRA);
+		cable_type = (fb_readw(PDTRA) >> 8) & 3;
+	}
+
+	/* Now select the output format (either composite or other) */
+	/* XXX: Save the previous val first, as this reg is also AICA
+	  related */
+	if (cable_type == CT_COMPOSITE)
+		fb_writel(3 << 8, VOUTC);
+	else if (cable_type == CT_RGB)
+		fb_writel(1 << 9, VOUTC);
+	else
+		fb_writel(0, VOUTC);
+
+	return cable_type;
+}
+
+static int pvr2fb_set_par(struct fb_info *info)
+{
+	struct pvr2fb_par *par = (struct pvr2fb_par *)info->par;
+	struct fb_var_screeninfo *var = &info->var;
+	unsigned long line_length;
+	unsigned int vtotal;
+
+	/*
+	 * XXX: It's possible that a user could use a VGA box, change the cable
+	 * type in hardware (i.e. switch from VGA<->composite), then change
+	 * modes (i.e. switching to another VT).  If that happens we should
+	 * automagically change the output format to cope, but currently I
+	 * don't have a VGA box to make sure this works properly.
+	 */
+	cable_type = pvr2_init_cable();
+	if (cable_type == CT_VGA && video_output != VO_VGA)
+		video_output = VO_VGA;
+
+	var->vmode &= FB_VMODE_MASK;
+	if (var->vmode & FB_VMODE_INTERLACED && video_output != VO_VGA)
+		par->is_interlaced = 1;
+	/*
+	 * XXX: Need to be more creative with this (i.e. allow doublecan for
+	 * PAL/NTSC output).
+	 */
+	if (var->vmode & FB_VMODE_DOUBLE && video_output == VO_VGA)
+		par->is_doublescan = 1;
+
+	par->hsync_total = var->left_margin + var->xres + var->right_margin +
+	                   var->hsync_len;
+	par->vsync_total = var->upper_margin + var->yres + var->lower_margin +
+	                   var->vsync_len;
+
+	if (var->sync & FB_SYNC_BROADCAST) {
+		vtotal = par->vsync_total;
+		if (par->is_interlaced)
+			vtotal /= 2;
+		if (vtotal > (PAL_VTOTAL + NTSC_VTOTAL)/2) {
+			/* XXX: Check for start values here... */
+			/* XXX: Check hardware for PAL-compatibility */
+			par->borderstart_h = 116;
+			par->borderstart_v = 44;
+		} else {
+			/* NTSC video output */
+			par->borderstart_h = 126;
+			par->borderstart_v = 18;
+		}
+	} else {
+		/* VGA mode */
+		/* XXX: What else needs to be checked? */
+		/*
+		 * XXX: We have a little freedom in VGA modes, what ranges
+		 * should be here (i.e. hsync/vsync totals, etc.)?
+		 */
+		par->borderstart_h = 126;
+		par->borderstart_v = 40;
+	}
+
+	/* Calculate the remainding offsets */
+	par->diwstart_h = par->borderstart_h + var->left_margin;
+	par->diwstart_v = par->borderstart_v + var->upper_margin;
+	par->borderstop_h = par->diwstart_h + var->xres +
+			    var->right_margin;
+	par->borderstop_v = par->diwstart_v + var->yres +
+			    var->lower_margin;
+
+	if (!par->is_interlaced)
+		par->borderstop_v /= 2;
+	if (info->var.xres < 640)
+		par->is_lowres = 1;
+
+	line_length = get_line_length(var->xres_virtual, var->bits_per_pixel);
+	par->disp_start = info->fix.smem_start + (line_length * var->yoffset) * line_length;
+	info->fix.line_length = line_length;
+	return 0;
+}
+
+static int pvr2fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
+{
+	struct pvr2fb_par *par = (struct pvr2fb_par *)info->par;
+	unsigned int vtotal, hsync_total;
+	unsigned long line_length;
+
+	if (var->pixclock != TV_CLK && var->pixclock != VGA_CLK) {
+		pr_debug("Invalid pixclock value %d\n", var->pixclock);
+		return -EINVAL;
+	}
+
+	if (var->xres < 320)
+		var->xres = 320;
+	if (var->yres < 240)
+		var->yres = 240;
+	if (var->xres_virtual < var->xres)
+		var->xres_virtual = var->xres;
+	if (var->yres_virtual < var->yres)
+		var->yres_virtual = var->yres;
+
+	if (var->bits_per_pixel <= 16)
+		var->bits_per_pixel = 16;
+	else if (var->bits_per_pixel <= 24)
+		var->bits_per_pixel = 24;
+	else if (var->bits_per_pixel <= 32)
+		var->bits_per_pixel = 32;
+
+	set_color_bitfields(var);
+
+	if (var->vmode & FB_VMODE_YWRAP) {
+		if (var->xoffset || var->yoffset >= var->yres_virtual) {
+			var->xoffset = var->yoffset = 0;
+		} else {
+			if (var->xoffset > var->xres_virtual - var->xres ||
+			    var->yoffset > var->yres_virtual - var->yres)
+				var->xoffset = var->yoffset = 0;
+		}
+	} else {
+		var->xoffset = var->yoffset = 0;
+	}
+
+	/*
+	 * XXX: Need to be more creative with this (i.e. allow doublecan for
+	 * PAL/NTSC output).
+	 */
+	if (var->yres < 480 && video_output == VO_VGA)
+		var->vmode |= FB_VMODE_DOUBLE;
+
+	if (video_output != VO_VGA) {
+		var->sync |= FB_SYNC_BROADCAST;
+		var->vmode |= FB_VMODE_INTERLACED;
+	} else {
+		var->sync &= ~FB_SYNC_BROADCAST;
+		var->vmode &= ~FB_VMODE_INTERLACED;
+		var->vmode |= FB_VMODE_NONINTERLACED;
+	}
+
+	if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_TEST) {
+		var->right_margin = par->borderstop_h -
+				   (par->diwstart_h + var->xres);
+		var->left_margin  = par->diwstart_h - par->borderstart_h;
+		var->hsync_len    = par->borderstart_h +
+		                   (par->hsync_total - par->borderstop_h);
+
+		var->upper_margin = par->diwstart_v - par->borderstart_v;
+		var->lower_margin = par->borderstop_v -
+				   (par->diwstart_v + var->yres);
+		var->vsync_len    = par->borderstop_v +
+				   (par->vsync_total - par->borderstop_v);
+	}
+
+	hsync_total = var->left_margin + var->xres + var->right_margin +
+		      var->hsync_len;
+	vtotal = var->upper_margin + var->yres + var->lower_margin +
+		 var->vsync_len;
+
+	if (var->sync & FB_SYNC_BROADCAST) {
+		if (var->vmode & FB_VMODE_INTERLACED)
+			vtotal /= 2;
+		if (vtotal > (PAL_VTOTAL + NTSC_VTOTAL)/2) {
+			/* PAL video output */
+			/* XXX: Should be using a range here ... ? */
+			if (hsync_total != PAL_HTOTAL) {
+				pr_debug("invalid hsync total for PAL\n");
+				return -EINVAL;
+			}
+		} else {
+			/* NTSC video output */
+			if (hsync_total != NTSC_HTOTAL) {
+				pr_debug("invalid hsync total for NTSC\n");
+				return -EINVAL;
+			}
+		}
+	}
+
+	/* Check memory sizes */
+	line_length = get_line_length(var->xres_virtual, var->bits_per_pixel);
+	if (line_length * var->yres_virtual > info->fix.smem_len)
+		return -ENOMEM;
+
+	return 0;
+}
+
+static void pvr2_update_display(struct fb_info *info)
+{
+	struct pvr2fb_par *par = (struct pvr2fb_par *) info->par;
+	struct fb_var_screeninfo *var = &info->var;
+
+	/* Update the start address of the display image */
+	fb_writel(par->disp_start, DISP_DIWADDRL);
+	fb_writel(par->disp_start +
+		  get_line_length(var->xoffset+var->xres, var->bits_per_pixel),
+	          DISP_DIWADDRS);
+}
+
+/*
+ * Initialize the video mode.  Currently, the 16bpp and 24bpp modes aren't
+ * very stable.  It's probably due to the fact that a lot of the 2D video
+ * registers are still undocumented.
+ */
+
+static void pvr2_init_display(struct fb_info *info)
+{
+	struct pvr2fb_par *par = (struct pvr2fb_par *) info->par;
+	struct fb_var_screeninfo *var = &info->var;
+	unsigned int diw_height, diw_width, diw_modulo = 1;
+	unsigned int bytesperpixel = var->bits_per_pixel >> 3;
+
+	/* hsync and vsync totals */
+	fb_writel((par->vsync_total << 16) | par->hsync_total, DISP_SYNCSIZE);
+
+	/* column height, modulo, row width */
+	/* since we're "panning" within vram, we need to offset things based
+	 * on the offset from the virtual x start to our real gfx. */
+	if (video_output != VO_VGA && par->is_interlaced)
+		diw_modulo += info->fix.line_length / 4;
+	diw_height = (par->is_interlaced ? var->yres / 2 : var->yres);
+	diw_width = get_line_length(var->xres, var->bits_per_pixel) / 4;
+	fb_writel((diw_modulo << 20) | (--diw_height << 10) | --diw_width,
+	          DISP_DIWSIZE);
+
+	/* display address, long and short fields */
+	fb_writel(par->disp_start, DISP_DIWADDRL);
+	fb_writel(par->disp_start +
+	          get_line_length(var->xoffset+var->xres, var->bits_per_pixel),
+	          DISP_DIWADDRS);
+
+	/* border horizontal, border vertical, border color */
+	fb_writel((par->borderstart_h << 16) | par->borderstop_h, DISP_BRDRHORZ);
+	fb_writel((par->borderstart_v << 16) | par->borderstop_v, DISP_BRDRVERT);
+	fb_writel(0, DISP_BRDRCOLR);
+
+	/* display window start position */
+	fb_writel(par->diwstart_h, DISP_DIWHSTRT);
+	fb_writel((par->diwstart_v << 16) | par->diwstart_v, DISP_DIWVSTRT);
+
+	/* misc. settings */
+	fb_writel((0x16 << 16) | par->is_lowres, DISP_DIWCONF);
+
+	/* clock doubler (for VGA), scan doubler, display enable */
+	fb_writel(((video_output == VO_VGA) << 23) |
+	          (par->is_doublescan << 1) | 1, DISP_DIWMODE);
+
+	/* bits per pixel */
+	fb_writel(fb_readl(DISP_DIWMODE) | (--bytesperpixel << 2), DISP_DIWMODE);
+	fb_writel(bytesperpixel << 2, DISP_PIXDEPTH);
+
+	/* video enable, color sync, interlace,
+	 * hsync and vsync polarity (currently unused) */
+	fb_writel(0x100 | ((par->is_interlaced /*|4*/) << 4), DISP_SYNCCONF);
+}
+
+/* Simulate blanking by making the border cover the entire screen */
+
+#define BLANK_BIT (1<<3)
+
+static void pvr2_do_blank(void)
+{
+	struct pvr2fb_par *par = currentpar;
+	unsigned long diwconf;
+
+	diwconf = fb_readl(DISP_DIWCONF);
+	if (do_blank > 0)
+		fb_writel(diwconf | BLANK_BIT, DISP_DIWCONF);
+	else
+		fb_writel(diwconf & ~BLANK_BIT, DISP_DIWCONF);
+
+	is_blanked = do_blank > 0 ? do_blank : 0;
+}
+
+static irqreturn_t __maybe_unused pvr2fb_interrupt(int irq, void *dev_id)
+{
+	struct fb_info *info = dev_id;
+
+	if (do_vmode_pan || do_vmode_full)
+		pvr2_update_display(info);
+	if (do_vmode_full)
+		pvr2_init_display(info);
+	if (do_vmode_pan)
+		do_vmode_pan = 0;
+	if (do_vmode_full)
+		do_vmode_full = 0;
+	if (do_blank) {
+		pvr2_do_blank();
+		do_blank = 0;
+	}
+	return IRQ_HANDLED;
+}
+
+#ifdef CONFIG_PVR2_DMA
+static ssize_t pvr2fb_write(struct fb_info *info, const char *buf,
+			    size_t count, loff_t *ppos)
+{
+	unsigned long dst, start, end, len;
+	unsigned int nr_pages;
+	struct page **pages;
+	int ret, i;
+
+	nr_pages = (count + PAGE_SIZE - 1) >> PAGE_SHIFT;
+
+	pages = kmalloc_array(nr_pages, sizeof(struct page *), GFP_KERNEL);
+	if (!pages)
+		return -ENOMEM;
+
+	ret = pin_user_pages_fast((unsigned long)buf, nr_pages, FOLL_WRITE, pages);
+	if (ret < nr_pages) {
+		if (ret < 0) {
+			/*
+			 *  Clamp the unsigned nr_pages to zero so that the
+			 *  error handling works. And leave ret at whatever
+			 *  -errno value was returned from GUP.
+			 */
+			nr_pages = 0;
+		} else {
+			nr_pages = ret;
+			/*
+			 * Use -EINVAL to represent a mildly desperate guess at
+			 * why we got fewer pages (maybe even zero pages) than
+			 * requested.
+			 */
+			ret = -EINVAL;
+		}
+		goto out_unmap;
+	}
+
+	dma_configure_channel(shdma, 0x12c1);
+
+	dst   = (unsigned long)fb_info->screen_base + *ppos;
+	start = (unsigned long)page_address(pages[0]);
+	end   = (unsigned long)page_address(pages[nr_pages]);
+	len   = nr_pages << PAGE_SHIFT;
+
+	/* Half-assed contig check */
+	if (start + len == end) {
+		/* As we do this in one shot, it's either all or nothing.. */
+		if ((*ppos + len) > fb_info->fix.smem_len) {
+			ret = -ENOSPC;
+			goto out_unmap;
+		}
+
+		dma_write(shdma, start, 0, len);
+		dma_write(pvr2dma, 0, dst, len);
+		dma_wait_for_completion(pvr2dma);
+
+		goto out;
+	}
+
+	/* Not contiguous, writeout per-page instead.. */
+	for (i = 0; i < nr_pages; i++, dst += PAGE_SIZE) {
+		if ((*ppos + (i << PAGE_SHIFT)) > fb_info->fix.smem_len) {
+			ret = -ENOSPC;
+			goto out_unmap;
+		}
+
+		dma_write_page(shdma, (unsigned long)page_address(pages[i]), 0);
+		dma_write_page(pvr2dma, 0, dst);
+		dma_wait_for_completion(pvr2dma);
+	}
+
+out:
+	*ppos += count;
+	ret = count;
+
+out_unmap:
+	unpin_user_pages(pages, nr_pages);
+	kfree(pages);
+
+	return ret;
+}
+#endif /* CONFIG_PVR2_DMA */
+
+static const struct fb_ops pvr2fb_ops = {
+	.owner		= THIS_MODULE,
+	.fb_setcolreg	= pvr2fb_setcolreg,
+	.fb_blank	= pvr2fb_blank,
+	.fb_check_var	= pvr2fb_check_var,
+	.fb_set_par	= pvr2fb_set_par,
+#ifdef CONFIG_PVR2_DMA
+	.fb_write	= pvr2fb_write,
+#endif
+	.fb_fillrect	= cfb_fillrect,
+	.fb_copyarea	= cfb_copyarea,
+	.fb_imageblit	= cfb_imageblit,
+};
+
+#ifndef MODULE
+static int pvr2_get_param_val(const struct pvr2_params *p, const char *s,
+			      int size)
+{
+	int i;
+
+	for (i = 0; i < size; i++) {
+		if (!strncasecmp(p[i].name, s, strlen(s)))
+			return p[i].val;
+	}
+	return -1;
+}
+#endif
+
+static char *pvr2_get_param_name(const struct pvr2_params *p, int val,
+			  int size)
+{
+	int i;
+
+	for (i = 0; i < size; i++) {
+		if (p[i].val == val)
+			return p[i].name;
+	}
+	return NULL;
+}
+
+/**
+ * pvr2fb_common_init
+ *
+ * Common init code for the PVR2 chips.
+ *
+ * This mostly takes care of the common aspects of the fb setup and
+ * registration. It's expected that the board-specific init code has
+ * already setup pvr2_fix with something meaningful at this point.
+ *
+ * Device info reporting is also done here, as well as picking a sane
+ * default from the modedb. For board-specific modelines, simply define
+ * a per-board modedb.
+ *
+ * Also worth noting is that the cable and video output types are likely
+ * always going to be VGA for the PCI-based PVR2 boards, but we leave this
+ * in for flexibility anyways. Who knows, maybe someone has tv-out on a
+ * PCI-based version of these things ;-)
+ */
+static int __maybe_unused pvr2fb_common_init(void)
+{
+	struct pvr2fb_par *par = currentpar;
+	unsigned long modememused, rev;
+
+	fb_info->screen_base = ioremap(pvr2_fix.smem_start,
+					       pvr2_fix.smem_len);
+
+	if (!fb_info->screen_base) {
+		printk(KERN_ERR "pvr2fb: Failed to remap smem space\n");
+		goto out_err;
+	}
+
+	par->mmio_base = ioremap(pvr2_fix.mmio_start,
+					 pvr2_fix.mmio_len);
+	if (!par->mmio_base) {
+		printk(KERN_ERR "pvr2fb: Failed to remap mmio space\n");
+		goto out_err;
+	}
+
+	fb_memset(fb_info->screen_base, 0, pvr2_fix.smem_len);
+
+	pvr2_fix.ypanstep	= nopan  ? 0 : 1;
+	pvr2_fix.ywrapstep	= nowrap ? 0 : 1;
+
+	fb_info->fbops		= &pvr2fb_ops;
+	fb_info->fix		= pvr2_fix;
+	fb_info->par		= currentpar;
+	fb_info->pseudo_palette	= currentpar->palette;
+	fb_info->flags		= FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
+
+	if (video_output == VO_VGA)
+		defmode = DEFMODE_VGA;
+
+	if (!mode_option)
+		mode_option = "640x480@60";
+
+	if (!fb_find_mode(&fb_info->var, fb_info, mode_option, pvr2_modedb,
+	                  NUM_TOTAL_MODES, &pvr2_modedb[defmode], 16))
+		fb_info->var = pvr2_var;
+
+	fb_alloc_cmap(&fb_info->cmap, 256, 0);
+
+	if (register_framebuffer(fb_info) < 0)
+		goto out_err;
+	/*Must write PIXDEPTH to register before anything is displayed - so force init */
+	pvr2_init_display(fb_info);
+
+	modememused = get_line_length(fb_info->var.xres_virtual,
+				      fb_info->var.bits_per_pixel);
+	modememused *= fb_info->var.yres_virtual;
+
+	rev = fb_readl(par->mmio_base + 0x04);
+
+	fb_info(fb_info, "%s (rev %ld.%ld) frame buffer device, using %ldk/%ldk of video memory\n",
+		fb_info->fix.id, (rev >> 4) & 0x0f, rev & 0x0f,
+		modememused >> 10,
+		(unsigned long)(fb_info->fix.smem_len >> 10));
+	fb_info(fb_info, "Mode %dx%d-%d pitch = %ld cable: %s video output: %s\n",
+		fb_info->var.xres, fb_info->var.yres,
+		fb_info->var.bits_per_pixel,
+		get_line_length(fb_info->var.xres, fb_info->var.bits_per_pixel),
+		pvr2_get_param_name(cables, cable_type, 3),
+		pvr2_get_param_name(outputs, video_output, 3));
+
+#ifdef CONFIG_SH_STORE_QUEUES
+	fb_notice(fb_info, "registering with SQ API\n");
+
+	pvr2fb_map = sq_remap(fb_info->fix.smem_start, fb_info->fix.smem_len,
+			      fb_info->fix.id, PAGE_SHARED);
+
+	fb_notice(fb_info, "Mapped video memory to SQ addr 0x%lx\n",
+		  pvr2fb_map);
+#endif
+
+	return 0;
+
+out_err:
+	if (fb_info->screen_base)
+		iounmap(fb_info->screen_base);
+	if (par->mmio_base)
+		iounmap(par->mmio_base);
+
+	return -ENXIO;
+}
+
+#ifdef CONFIG_SH_DREAMCAST
+static int __init pvr2fb_dc_init(void)
+{
+	if (!mach_is_dreamcast())
+		return -ENXIO;
+
+	/* Make a guess at the monitor based on the attached cable */
+	if (pvr2_init_cable() == CT_VGA) {
+		fb_info->monspecs.hfmin = 30000;
+		fb_info->monspecs.hfmax = 70000;
+		fb_info->monspecs.vfmin = 60;
+		fb_info->monspecs.vfmax = 60;
+	} else {
+		/* Not VGA, using a TV (taken from acornfb) */
+		fb_info->monspecs.hfmin = 15469;
+		fb_info->monspecs.hfmax = 15781;
+		fb_info->monspecs.vfmin = 49;
+		fb_info->monspecs.vfmax = 51;
+	}
+
+	/*
+	 * XXX: This needs to pull default video output via BIOS or other means
+	 */
+	if (video_output < 0) {
+		if (cable_type == CT_VGA) {
+			video_output = VO_VGA;
+		} else {
+			video_output = VO_NTSC;
+		}
+	}
+
+	/*
+	 * Nothing exciting about the DC PVR2 .. only a measly 8MiB.
+	 */
+	pvr2_fix.smem_start	= 0xa5000000;	/* RAM starts here */
+	pvr2_fix.smem_len	= 8 << 20;
+
+	pvr2_fix.mmio_start	= 0xa05f8000;	/* registers start here */
+	pvr2_fix.mmio_len	= 0x2000;
+
+	if (request_irq(HW_EVENT_VSYNC, pvr2fb_interrupt, IRQF_SHARED,
+	                "pvr2 VBL handler", fb_info)) {
+		return -EBUSY;
+	}
+
+#ifdef CONFIG_PVR2_DMA
+	if (request_dma(pvr2dma, "pvr2") != 0) {
+		free_irq(HW_EVENT_VSYNC, fb_info);
+		return -EBUSY;
+	}
+#endif
+
+	return pvr2fb_common_init();
+}
+
+static void pvr2fb_dc_exit(void)
+{
+	if (fb_info->screen_base) {
+		iounmap(fb_info->screen_base);
+		fb_info->screen_base = NULL;
+	}
+	if (currentpar->mmio_base) {
+		iounmap(currentpar->mmio_base);
+		currentpar->mmio_base = NULL;
+	}
+
+	free_irq(HW_EVENT_VSYNC, fb_info);
+#ifdef CONFIG_PVR2_DMA
+	free_dma(pvr2dma);
+#endif
+}
+#endif /* CONFIG_SH_DREAMCAST */
+
+#ifdef CONFIG_PCI
+static int pvr2fb_pci_probe(struct pci_dev *pdev,
+			    const struct pci_device_id *ent)
+{
+	int ret;
+
+	ret = aperture_remove_conflicting_pci_devices(pdev, "pvrfb");
+	if (ret)
+		return ret;
+
+	ret = pci_enable_device(pdev);
+	if (ret) {
+		printk(KERN_ERR "pvr2fb: PCI enable failed\n");
+		return ret;
+	}
+
+	ret = pci_request_regions(pdev, "pvr2fb");
+	if (ret) {
+		printk(KERN_ERR "pvr2fb: PCI request regions failed\n");
+		return ret;
+	}
+
+	/*
+	 * Slightly more exciting than the DC PVR2 .. 16MiB!
+	 */
+	pvr2_fix.smem_start	= pci_resource_start(pdev, 0);
+	pvr2_fix.smem_len	= pci_resource_len(pdev, 0);
+
+	pvr2_fix.mmio_start	= pci_resource_start(pdev, 1);
+	pvr2_fix.mmio_len	= pci_resource_len(pdev, 1);
+
+	fb_info->device		= &pdev->dev;
+
+	return pvr2fb_common_init();
+}
+
+static void pvr2fb_pci_remove(struct pci_dev *pdev)
+{
+	if (fb_info->screen_base) {
+		iounmap(fb_info->screen_base);
+		fb_info->screen_base = NULL;
+	}
+	if (currentpar->mmio_base) {
+		iounmap(currentpar->mmio_base);
+		currentpar->mmio_base = NULL;
+	}
+
+	pci_release_regions(pdev);
+}
+
+static const struct pci_device_id pvr2fb_pci_tbl[] = {
+	{ PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_NEON250,
+	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
+	{ 0, },
+};
+
+MODULE_DEVICE_TABLE(pci, pvr2fb_pci_tbl);
+
+static struct pci_driver pvr2fb_pci_driver = {
+	.name		= "pvr2fb",
+	.id_table	= pvr2fb_pci_tbl,
+	.probe		= pvr2fb_pci_probe,
+	.remove		= pvr2fb_pci_remove,
+};
+
+static int __init pvr2fb_pci_init(void)
+{
+	return pci_register_driver(&pvr2fb_pci_driver);
+}
+
+static void pvr2fb_pci_exit(void)
+{
+	pci_unregister_driver(&pvr2fb_pci_driver);
+}
+#endif /* CONFIG_PCI */
+
+/*
+ * Parse command arguments.  Supported arguments are:
+ *    inverse                             Use inverse color maps
+ *    cable:composite|rgb|vga             Override the video cable type
+ *    output:NTSC|PAL|VGA                 Override the video output format
+ *
+ *    <xres>x<yres>[-<bpp>][@<refresh>]   or,
+ *    <name>[-<bpp>][@<refresh>]          Startup using this video mode
+ */
+
+#ifndef MODULE
+static int __init pvr2fb_setup(char *options)
+{
+	char *this_opt;
+	char cable_arg[80];
+	char output_arg[80];
+
+	if (!options || !*options)
+		return 0;
+
+	cable_arg[0] = output_arg[0] = 0;
+
+	while ((this_opt = strsep(&options, ","))) {
+		if (!*this_opt)
+			continue;
+		if (!strcmp(this_opt, "inverse")) {
+			fb_invert_cmaps();
+		} else if (!strncmp(this_opt, "cable:", 6)) {
+			strcpy(cable_arg, this_opt + 6);
+		} else if (!strncmp(this_opt, "output:", 7)) {
+			strcpy(output_arg, this_opt + 7);
+		} else if (!strncmp(this_opt, "nopan", 5)) {
+			nopan = 1;
+		} else if (!strncmp(this_opt, "nowrap", 6)) {
+			nowrap = 1;
+		} else {
+			mode_option = this_opt;
+		}
+	}
+
+	if (*cable_arg)
+		cable_type = pvr2_get_param_val(cables, cable_arg, 3);
+	if (*output_arg)
+		video_output = pvr2_get_param_val(outputs, output_arg, 3);
+
+	return 0;
+}
+#endif
+
+static struct pvr2_board {
+	int (*init)(void);
+	void (*exit)(void);
+	char name[16];
+} board_driver[] __refdata = {
+#ifdef CONFIG_SH_DREAMCAST
+	{ pvr2fb_dc_init, pvr2fb_dc_exit, "Sega DC PVR2" },
+#endif
+#ifdef CONFIG_PCI
+	{ pvr2fb_pci_init, pvr2fb_pci_exit, "PCI PVR2" },
+#endif
+	{ 0, },
+};
+
+static int __init pvr2fb_init(void)
+{
+	int i, ret = -ENODEV;
+
+#ifndef MODULE
+	char *option = NULL;
+
+	if (fb_get_options("pvr2fb", &option))
+		return -ENODEV;
+	pvr2fb_setup(option);
+#endif
+
+	fb_info = framebuffer_alloc(sizeof(struct pvr2fb_par), NULL);
+	if (!fb_info)
+		return -ENOMEM;
+
+	currentpar = fb_info->par;
+
+	for (i = 0; i < ARRAY_SIZE(board_driver); i++) {
+		struct pvr2_board *pvr_board = board_driver + i;
+
+		if (!pvr_board->init)
+			continue;
+
+		ret = pvr_board->init();
+
+		if (ret != 0) {
+			printk(KERN_ERR "pvr2fb: Failed init of %s device\n",
+				pvr_board->name);
+			framebuffer_release(fb_info);
+			break;
+		}
+	}
+
+	return ret;
+}
+
+static void __exit pvr2fb_exit(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(board_driver); i++) {
+		struct pvr2_board *pvr_board = board_driver + i;
+
+		if (pvr_board->exit)
+			pvr_board->exit();
+	}
+
+#ifdef CONFIG_SH_STORE_QUEUES
+	sq_unmap(pvr2fb_map);
+#endif
+
+	unregister_framebuffer(fb_info);
+	framebuffer_release(fb_info);
+}
+
+module_init(pvr2fb_init);
+module_exit(pvr2fb_exit);
+
+MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>, M. R. Brown <mrbrown@0xd6.org>");
+MODULE_DESCRIPTION("Framebuffer driver for NEC PowerVR 2 based graphics boards");
+MODULE_LICENSE("GPL");