fbdev: simplefb: add init through platform_data

If we create proper platform-devices in x86 boot-code, we can use simplefb
for VBE or EFI framebuffers, too. However, there is normally no OF support
so we introduce a platform_data object so x86 boot-code can pass the
parameters via plain old platform-data.

This also removes the OF dependency as it is not needed. The headers
provide proper dummies for the case OF is disabled.

Furthermore, we move the FORMAT-definitions to the common platform header
so initialization code can use it to transform "struct screen_info" to
the right format-name.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Link: http://lkml.kernel.org/r/1375445127-15480-2-git-send-email-dh.herrmann@gmail.com
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

3 files changed, 93 insertions, 16 deletions

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 4cf1e1dd5621..34c3d960634d 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -2457,7 +2457,7 @@ config FB_HYPERV
 
 config FB_SIMPLE
         bool "Simple framebuffer support"
-        depends on (FB = y) && OF
+        depends on (FB = y)
         select FB_CFB_FILLRECT
         select FB_CFB_COPYAREA
         select FB_CFB_IMAGEBLIT
@@ -2469,8 +2469,7 @@ config FB_SIMPLE
           pre-allocated frame buffer surface.
 
           Configuration re: surface address, size, and format must be provided
-          through device tree, or potentially plain old platform data in the
-          future.
+          through device tree, or plain old platform data.
 
 source "drivers/video/omap/Kconfig"
 source "drivers/video/omap2/Kconfig"
diff --git a/drivers/video/simplefb.c b/drivers/video/simplefb.c
index e2e9e3e61b72..588698986ce1 100644
--- a/drivers/video/simplefb.c
+++ b/drivers/video/simplefb.c
@@ -24,6 +24,7 @@
 #include <linux/fb.h>
 #include <linux/io.h>
 #include <linux/module.h>
+#include <linux/platform_data/simplefb.h>
 #include <linux/platform_device.h>
 
 static struct fb_fix_screeninfo simplefb_fix = {
@@ -73,18 +74,7 @@ static struct fb_ops simplefb_ops = {
         .fb_imageblit   = cfb_imageblit,
 };
 
-struct simplefb_format {
-        const char *name;
-        u32 bits_per_pixel;
-        struct fb_bitfield red;
-        struct fb_bitfield green;
-        struct fb_bitfield blue;
-        struct fb_bitfield transp;
-};
-
-static struct simplefb_format simplefb_formats[] = {
-        { "r5g6b5", 16, {11, 5}, {5, 6}, {0, 5}, {0, 0} },
-};
+static struct simplefb_format simplefb_formats[] = SIMPLEFB_FORMATS;
 
 struct simplefb_params {
         u32 width;
@@ -139,6 +129,33 @@ static int simplefb_parse_dt(struct platform_device *pdev,
         return 0;
 }
 
+static int simplefb_parse_pd(struct platform_device *pdev,
+                             struct simplefb_params *params)
+{
+        struct simplefb_platform_data *pd = pdev->dev.platform_data;
+        int i;
+
+        params->width = pd->width;
+        params->height = pd->height;
+        params->stride = pd->stride;
+
+        params->format = NULL;
+        for (i = 0; i < ARRAY_SIZE(simplefb_formats); i++) {
+                if (strcmp(pd->format, simplefb_formats[i].name))
+                        continue;
+
+                params->format = &simplefb_formats[i];
+                break;
+        }
+
+        if (!params->format) {
+                dev_err(&pdev->dev, "Invalid format value\n");
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
 static int simplefb_probe(struct platform_device *pdev)
 {
         int ret;
@@ -149,7 +166,12 @@ static int simplefb_probe(struct platform_device *pdev)
         if (fb_get_options("simplefb", NULL))
                 return -ENODEV;
 
-        ret = simplefb_parse_dt(pdev, &params);
+        ret = -ENODEV;
+        if (pdev->dev.platform_data)
+                ret = simplefb_parse_pd(pdev, &params);
+        else if (pdev->dev.of_node)
+                ret = simplefb_parse_dt(pdev, &params);
+
         if (ret)
                 return ret;
 
diff --git a/include/linux/platform_data/simplefb.h b/include/linux/platform_data/simplefb.h
new file mode 100644
index 000000000000..5fa2c5e02ab8
--- /dev/null
+++ b/include/linux/platform_data/simplefb.h
@@ -0,0 +1,56 @@
+/*
+ * simplefb.h - Simple Framebuffer Device
+ *
+ * Copyright (C) 2013 David Herrmann <dh.herrmann@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef __PLATFORM_DATA_SIMPLEFB_H__
+#define __PLATFORM_DATA_SIMPLEFB_H__
+
+#include <drm/drm_fourcc.h>
+#include <linux/fb.h>
+#include <linux/kernel.h>
+
+/* format array, use it to initialize a "struct simplefb_format" array */
+#define SIMPLEFB_FORMATS \
+{ \
+        { "r5g6b5", 16, {11, 5}, {5, 6}, {0, 5}, {0, 0}, DRM_FORMAT_RGB565 }, \
+}
+
+/*
+ * Data-Format for Simple-Framebuffers
+ * @name: unique 0-terminated name that can be used to identify the mode
+ * @red,green,blue: Offsets and sizes of the single RGB parts
+ * @transp: Offset and size of the alpha bits. length=0 means no alpha
+ * @fourcc: 32bit DRM four-CC code (see drm_fourcc.h)
+ */
+struct simplefb_format {
+        const char *name;
+        u32 bits_per_pixel;
+        struct fb_bitfield red;
+        struct fb_bitfield green;
+        struct fb_bitfield blue;
+        struct fb_bitfield transp;
+        u32 fourcc;
+};
+
+/*
+ * Simple-Framebuffer description
+ * If the arch-boot code creates simple-framebuffers without DT support, it
+ * can pass the width, height, stride and format via this platform-data object.
+ * The framebuffer location must be given as IORESOURCE_MEM resource.
+ * @format must be a format as described in "struct simplefb_format" above.
+ */
+struct simplefb_platform_data {
+        u32 width;
+        u32 height;
+        u32 stride;
+        const char *format;
+};
+
+#endif /* __PLATFORM_DATA_SIMPLEFB_H__ */