From b20732900e4636a467c0183a47f7396700f5f743 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 7 Aug 2024 15:11:22 +0200
Subject: Adding upstream version 6.9.7.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 drivers/video/screen_info_generic.c | 146 ++++++++++++++++++++++++++++++++++++
 1 file changed, 146 insertions(+)
 create mode 100644 drivers/video/screen_info_generic.c

(limited to 'drivers/video/screen_info_generic.c')

diff --git a/drivers/video/screen_info_generic.c b/drivers/video/screen_info_generic.c
new file mode 100644
index 0000000000..64117c6367
--- /dev/null
+++ b/drivers/video/screen_info_generic.c
@@ -0,0 +1,146 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/export.h>
+#include <linux/ioport.h>
+#include <linux/screen_info.h>
+#include <linux/string.h>
+
+static void resource_init_named(struct resource *r,
+				resource_size_t start, resource_size_t size,
+				const char *name, unsigned int flags)
+{
+	memset(r, 0, sizeof(*r));
+
+	r->start = start;
+	r->end = start + size - 1;
+	r->name = name;
+	r->flags = flags;
+}
+
+static void resource_init_io_named(struct resource *r,
+				   resource_size_t start, resource_size_t size,
+				   const char *name)
+{
+	resource_init_named(r, start, size, name, IORESOURCE_IO);
+}
+
+static void resource_init_mem_named(struct resource *r,
+				   resource_size_t start, resource_size_t size,
+				   const char *name)
+{
+	resource_init_named(r, start, size, name, IORESOURCE_MEM);
+}
+
+static inline bool __screen_info_has_ega_gfx(unsigned int mode)
+{
+	switch (mode) {
+	case 0x0d:	/* 320x200-4 */
+	case 0x0e:	/* 640x200-4 */
+	case 0x0f:	/* 640x350-1 */
+	case 0x10:	/* 640x350-4 */
+		return true;
+	default:
+		return false;
+	}
+}
+
+static inline bool __screen_info_has_vga_gfx(unsigned int mode)
+{
+	switch (mode) {
+	case 0x10:	/* 640x480-1 */
+	case 0x12:	/* 640x480-4 */
+	case 0x13:	/* 320-200-8 */
+	case 0x6a:	/* 800x600-4 (VESA) */
+		return true;
+	default:
+		return __screen_info_has_ega_gfx(mode);
+	}
+}
+
+/**
+ * screen_info_resources() - Get resources from screen_info structure
+ * @si: the screen_info
+ * @r: pointer to an array of resource structures
+ * @num: number of elements in @r:
+ *
+ * Returns:
+ * The number of resources stored in @r on success, or a negative errno code otherwise.
+ *
+ * A call to screen_info_resources() returns the resources consumed by the
+ * screen_info's device or framebuffer. The result is stored in the caller-supplied
+ * array @r with up to @num elements. The function returns the number of
+ * initialized elements.
+ */
+ssize_t screen_info_resources(const struct screen_info *si, struct resource *r, size_t num)
+{
+	struct resource *pos = r;
+	unsigned int type = screen_info_video_type(si);
+	u64 base, size;
+
+	switch (type) {
+	case VIDEO_TYPE_MDA:
+		if (num > 0)
+			resource_init_io_named(pos++, 0x3b0, 12, "mda");
+		if (num > 1)
+			resource_init_io_named(pos++, 0x3bf, 0x01, "mda");
+		if (num > 2)
+			resource_init_mem_named(pos++, 0xb0000, 0x2000, "mda");
+		break;
+	case VIDEO_TYPE_CGA:
+		if (num > 0)
+			resource_init_io_named(pos++, 0x3d4, 0x02, "cga");
+		if (num > 1)
+			resource_init_mem_named(pos++, 0xb8000, 0x2000, "cga");
+		break;
+	case VIDEO_TYPE_EGAM:
+		if (num > 0)
+			resource_init_io_named(pos++, 0x3bf, 0x10, "ega");
+		if (num > 1)
+			resource_init_mem_named(pos++, 0xb0000, 0x8000, "ega");
+		break;
+	case VIDEO_TYPE_EGAC:
+		if (num > 0)
+			resource_init_io_named(pos++, 0x3c0, 0x20, "ega");
+		if (num > 1) {
+			if (__screen_info_has_ega_gfx(si->orig_video_mode))
+				resource_init_mem_named(pos++, 0xa0000, 0x10000, "ega");
+			else
+				resource_init_mem_named(pos++, 0xb8000, 0x8000, "ega");
+		}
+		break;
+	case VIDEO_TYPE_VGAC:
+		if (num > 0)
+			resource_init_io_named(pos++, 0x3c0, 0x20, "vga+");
+		if (num > 1) {
+			if (__screen_info_has_vga_gfx(si->orig_video_mode))
+				resource_init_mem_named(pos++, 0xa0000, 0x10000, "vga+");
+			else
+				resource_init_mem_named(pos++, 0xb8000, 0x8000, "vga+");
+		}
+		break;
+	case VIDEO_TYPE_VLFB:
+	case VIDEO_TYPE_EFI:
+		base = __screen_info_lfb_base(si);
+		if (!base)
+			break;
+		size = __screen_info_lfb_size(si, type);
+		if (!size)
+			break;
+		if (num > 0)
+			resource_init_mem_named(pos++, base, size, "lfb");
+		break;
+	case VIDEO_TYPE_PICA_S3:
+	case VIDEO_TYPE_MIPS_G364:
+	case VIDEO_TYPE_SGI:
+	case VIDEO_TYPE_TGAC:
+	case VIDEO_TYPE_SUN:
+	case VIDEO_TYPE_SUNPCI:
+	case VIDEO_TYPE_PMAC:
+	default:
+		/* not supported */
+		return -EINVAL;
+	}
+
+	return pos - r;
+}
+EXPORT_SYMBOL(screen_info_resources);
-- 
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