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path: root/drivers/video/screen_info_generic.c
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Diffstat (limited to 'drivers/video/screen_info_generic.c')
-rw-r--r--drivers/video/screen_info_generic.c146
1 files changed, 146 insertions, 0 deletions
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);