efifb/imacfb consolidation + hardware support

Remove imacfb entirely, merging its DMI table into the (otherwise very
similar) efifb driver.  This also adds hardware support for many of the
newer Intel Apple hardware.  This has been fairly well tested; we've been
shipping it in Fedora for some time.
Signed-off-by: Peter Jones <pjones@redhat.com>
Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
Cc: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Cc: Jaya Kumar <jayakumar.lkml@gmail.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/video/Kconfig

@@ -689,23 +689,14 @@ config FB_VESA
 
 config FB_EFI
 	bool "EFI-based Framebuffer Support"
-	depends on (FB = y) && X86
-	select FB_CFB_FILLRECT
-	select FB_CFB_COPYAREA
-	select FB_CFB_IMAGEBLIT
-	help
-	  This is the EFI frame buffer device driver. If the firmware on
-	  your platform is UEFI2.0, select Y to add support for
-	  Graphics Output Protocol for early console messages to appear.
-
-config FB_IMAC
-	bool "Intel-based Macintosh Framebuffer Support"
 	depends on (FB = y) && X86 && EFI
 	select FB_CFB_FILLRECT
 	select FB_CFB_COPYAREA
 	select FB_CFB_IMAGEBLIT
 	help
-	  This is the frame buffer device driver for the Intel-based Macintosh
+	  This is the EFI frame buffer device driver. If the firmware on
+	  your platform is EFI 1.10 or UEFI 2.0, select Y to add support for
+	  using the EFI framebuffer as your console.
 
 config FB_N411
        tristate "N411 Apollo/Hecuba devkit support"

drivers/video/Makefile

@@ -125,7 +125,6 @@ obj-$(CONFIG_FB_CARMINE)          += carminefb.o
 # Platform or fallback drivers go here
 obj-$(CONFIG_FB_UVESA)            += uvesafb.o
 obj-$(CONFIG_FB_VESA)             += vesafb.o
-obj-$(CONFIG_FB_IMAC)             += imacfb.o
 obj-$(CONFIG_FB_EFI)              += efifb.o
 obj-$(CONFIG_FB_VGA16)            += vga16fb.o
 obj-$(CONFIG_FB_OF)               += offb.o

drivers/video/efifb.c

@@ -12,6 +12,7 @@
 #include <linux/fb.h>
 #include <linux/platform_device.h>
 #include <linux/screen_info.h>
+#include <linux/dmi.h>
 
 #include <video/vga.h>
 
@@ -33,6 +34,105 @@ static struct fb_fix_screeninfo efifb_fix __initdata = {
 	.visual			= FB_VISUAL_TRUECOLOR,
 };
 
+enum {
+	M_I17,		/* 17-Inch iMac */
+	M_I20,		/* 20-Inch iMac */
+	M_I20_SR,	/* 20-Inch iMac (Santa Rosa) */
+	M_I24,		/* 24-Inch iMac */
+	M_MINI,		/* Mac Mini */
+	M_MB,		/* MacBook */
+	M_MB_2,		/* MacBook, 2nd rev. */
+	M_MB_3,		/* MacBook, 3rd rev. */
+	M_MB_SR,	/* MacBook, 2nd gen, (Santa Rosa) */
+	M_MBA,		/* MacBook Air */
+	M_MBP,		/* MacBook Pro */
+	M_MBP_2,	/* MacBook Pro 2nd gen */
+	M_MBP_SR,	/* MacBook Pro (Santa Rosa) */
+	M_MBP_4,	/* MacBook Pro, 4th gen */
+	M_UNKNOWN	/* placeholder */
+};
+
+static struct efifb_dmi_info {
+	char *optname;
+	unsigned long base;
+	int stride;
+	int width;
+	int height;
+} dmi_list[] = {
+	[M_I17] = { "i17", 0x80010000, 1472 * 4, 1440, 900 },
+	[M_I20] = { "i20", 0x80010000, 1728 * 4, 1680, 1050 }, /* guess */
+	[M_I20_SR] = { "imac7", 0x40010000, 1728 * 4, 1680, 1050 },
+	[M_I24] = { "i24", 0x80010000, 2048 * 4, 1920, 1200 }, /* guess */
+	[M_MINI]= { "mini", 0x80000000, 2048 * 4, 1024, 768 },
+	[M_MB] = { "macbook", 0x80000000, 2048 * 4, 1280, 800 },
+	[M_MBA] = { "mba", 0x80000000, 2048 * 4, 1280, 800 },
+	[M_MBP] = { "mbp", 0x80010000, 1472 * 4, 1440, 900 },
+	[M_MBP_2] = { "mbp2", 0, 0, 0, 0 }, /* placeholder */
+	[M_MBP_SR] = { "mbp3", 0x80030000, 2048 * 4, 1440, 900 },
+	[M_MBP_4] = { "mbp4", 0xc0060000, 2048 * 4, 1920, 1200 },
+	[M_UNKNOWN] = { NULL, 0, 0, 0, 0 }
+};
+
+static int set_system(const struct dmi_system_id *id);
+
+#define EFIFB_DMI_SYSTEM_ID(vendor, name, enumid)		\
+	{ set_system, name, {					\
+		DMI_MATCH(DMI_BIOS_VENDOR, vendor),		\
+		DMI_MATCH(DMI_PRODUCT_NAME, name) },		\
+	  &dmi_list[enumid] }
+
+static struct dmi_system_id __initdata dmi_system_table[] = {
+	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac4,1", M_I17),
+	/* At least one of these two will be right; maybe both? */
+	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac5,1", M_I20),
+	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac5,1", M_I20),
+	/* At least one of these two will be right; maybe both? */
+	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac6,1", M_I24),
+	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac6,1", M_I24),
+	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac7,1", M_I20_SR),
+	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "Macmini1,1", M_MINI),
+	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook1,1", M_MB),
+	/* At least one of these two will be right; maybe both? */
+	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook2,1", M_MB),
+	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook2,1", M_MB),
+	/* At least one of these two will be right; maybe both? */
+	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook3,1", M_MB),
+	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook3,1", M_MB),
+	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook4,1", M_MB),
+	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookAir1,1", M_MBA),
+	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro1,1", M_MBP),
+	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro2,1", M_MBP_2),
+	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro2,1", M_MBP_2),
+	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro3,1", M_MBP_SR),
+	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro3,1", M_MBP_SR),
+	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro4,1", M_MBP_4),
+	{},
+};
+
+static int set_system(const struct dmi_system_id *id)
+{
+	struct efifb_dmi_info *info = id->driver_data;
+	if (info->base == 0)
+		return -ENODEV;
+
+	printk(KERN_INFO "efifb: dmi detected %s - framebuffer at %p "
+			 "(%dx%d, stride %d)\n", id->ident,
+			 (void *)info->base, info->width, info->height,
+			 info->stride);
+
+	/* Trust the bootloader over the DMI tables */
+	if (screen_info.lfb_base == 0)
+		screen_info.lfb_base = info->base;
+	if (screen_info.lfb_linelength == 0)
+		screen_info.lfb_linelength = info->stride;
+	if (screen_info.lfb_width == 0)
+		screen_info.lfb_width = info->width;
+	if (screen_info.lfb_height == 0)
+		screen_info.lfb_height = info->height;
+
+	return 0;
+}
+
 static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green,
 			   unsigned blue, unsigned transp,
 			   struct fb_info *info)
@@ -67,6 +167,38 @@ static struct fb_ops efifb_ops = {
 	.fb_imageblit	= cfb_imageblit,
 };
 
+static int __init efifb_setup(char *options)
+{
+	char *this_opt;
+	int i;
+
+	if (!options || !*options)
+		return 0;
+
+	while ((this_opt = strsep(&options, ",")) != NULL) {
+		if (!*this_opt) continue;
+
+		for (i = 0; i < M_UNKNOWN; i++) {
+			if (!strcmp(this_opt, dmi_list[i].optname) &&
+					dmi_list[i].base != 0) {
+				screen_info.lfb_base = dmi_list[i].base;
+				screen_info.lfb_linelength = dmi_list[i].stride;
+				screen_info.lfb_width = dmi_list[i].width;
+				screen_info.lfb_height = dmi_list[i].height;
+			}
+		}
+		if (!strncmp(this_opt, "base:", 5))
+			screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
+		else if (!strncmp(this_opt, "stride:", 7))
+			screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
+		else if (!strncmp(this_opt, "height:", 7))
+			screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
+		else if (!strncmp(this_opt, "width:", 6))
+			screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
+	}
+	return 0;
+}
+
 static int __init efifb_probe(struct platform_device *dev)
 {
 	struct fb_info *info;
@@ -74,6 +206,26 @@ static int __init efifb_probe(struct platform_device *dev)
 	unsigned int size_vmode;
 	unsigned int size_remap;
 	unsigned int size_total;
+	int request_succeeded = 0;
+
+	printk(KERN_INFO "efifb: probing for efifb\n");
+
+	if (!screen_info.lfb_depth)
+		screen_info.lfb_depth = 32;
+	if (!screen_info.pages)
+		screen_info.pages = 1;
+
+	/* just assume they're all unset if any are */
+	if (!screen_info.blue_size) {
+		screen_info.blue_size = 8;
+		screen_info.blue_pos = 0;
+		screen_info.green_size = 8;
+		screen_info.green_pos = 8;
+		screen_info.red_size = 8;
+		screen_info.red_pos = 16;
+		screen_info.rsvd_size = 8;
+		screen_info.rsvd_pos = 24;
+	}
 
 	efifb_fix.smem_start = screen_info.lfb_base;
 	efifb_defined.bits_per_pixel = screen_info.lfb_depth;
@@ -98,21 +250,25 @@ static int __init efifb_probe(struct platform_device *dev)
 	 *                 option to simply use size_total as that
 	 *                 wastes plenty of kernel address space. */
 	size_remap  = size_vmode * 2;
-	if (size_remap < size_vmode)
-		size_remap = size_vmode;
 	if (size_remap > size_total)
 		size_remap = size_total;
+	if (size_remap % PAGE_SIZE)
+		size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
 	efifb_fix.smem_len = size_remap;
 
-	if (!request_mem_region(efifb_fix.smem_start, size_total, "efifb"))
+	if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
+		request_succeeded = 1;
+	} else {
 		/* We cannot make this fatal. Sometimes this comes from magic
 		   spaces our resource handlers simply don't know about */
 		printk(KERN_WARNING
 		       "efifb: cannot reserve video memory at 0x%lx\n",
 			efifb_fix.smem_start);
+	}
 
 	info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
 	if (!info) {
+		printk(KERN_ERR "efifb: cannot allocate framebuffer\n");
 		err = -ENOMEM;
 		goto err_release_mem;
 	}
@@ -125,7 +281,7 @@ static int __init efifb_probe(struct platform_device *dev)
 				"0x%x @ 0x%lx\n",
 			efifb_fix.smem_len, efifb_fix.smem_start);
 		err = -EIO;
-		goto err_unmap;
+		goto err_release_fb;
 	}
 
 	printk(KERN_INFO "efifb: framebuffer at 0x%lx, mapped to 0x%p, "
@@ -178,25 +334,27 @@ static int __init efifb_probe(struct platform_device *dev)
 	info->fix = efifb_fix;
 	info->flags = FBINFO_FLAG_DEFAULT;
 
-	if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
-		err = -ENOMEM;
+	if ((err = fb_alloc_cmap(&info->cmap, 256, 0)) < 0) {
+		printk(KERN_ERR "efifb: cannot allocate colormap\n");
 		goto err_unmap;
 	}
-	if (register_framebuffer(info) < 0) {
-		err = -EINVAL;
+	if ((err = register_framebuffer(info)) < 0) {
+		printk(KERN_ERR "efifb: cannot register framebuffer\n");
 		goto err_fb_dealoc;
 	}
 	printk(KERN_INFO "fb%d: %s frame buffer device\n",
-	       info->node, info->fix.id);
+		info->node, info->fix.id);
 	return 0;
 
 err_fb_dealoc:
 	fb_dealloc_cmap(&info->cmap);
 err_unmap:
 	iounmap(info->screen_base);
+err_release_fb:
 	framebuffer_release(info);
 err_release_mem:
-	release_mem_region(efifb_fix.smem_start, size_total);
+	if (request_succeeded)
+		release_mem_region(efifb_fix.smem_start, size_total);
 	return err;
 }
 
@@ -214,9 +372,22 @@ static struct platform_device efifb_device = {
 static int __init efifb_init(void)
 {
 	int ret;
+	char *option = NULL;
 
 	if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
 		return -ENODEV;
+	dmi_check_system(dmi_system_table);
+
+	if (fb_get_options("efifb", &option))
+		return -ENODEV;
+	efifb_setup(option);
+
+	/* We don't get linelength from UGA Draw Protocol, only from
+	 * EFI Graphics Protocol.  So if it's not in DMI, and it's not
+	 * passed in from the user, we really can't use the framebuffer.
+	 */
+	if (!screen_info.lfb_linelength)
+		return -ENODEV;
 
 	ret = platform_driver_register(&efifb_driver);