video: vt8500: Add devicetree support for vt8500-fb and wm8505-fb

Update vt8500-fb, wm8505-fb and wmt-ge-rops to support device
tree bindings.
Small change in wm8505-fb.c to support WM8650 framebuffer color
format.

Signed-off-by: Tony Prisk <linux@prisktech.co.nz>

1 files changed, 82 insertions, 15 deletions

diff --git a/drivers/video/wm8505fb.c b/drivers/video/wm8505fb.c
index c8703bd61b7..ec474244210 100644
--- a/drivers/video/wm8505fb.c
+++ b/drivers/video/wm8505fb.c
@@ -28,6 +28,9 @@
 #include <linux/dma-mapping.h>
 #include <linux/platform_device.h>
 #include <linux/wait.h>
+#include <linux/of.h>
+#include <linux/of_fdt.h>
+#include <linux/memblock.h>
 
 #include <mach/vt8500fb.h>
 
@@ -59,8 +62,12 @@ static int wm8505fb_init_hw(struct fb_info *info)
         writel(fbi->fb.fix.smem_start, fbi->regbase + WMT_GOVR_FBADDR);
         writel(fbi->fb.fix.smem_start, fbi->regbase + WMT_GOVR_FBADDR1);
 
-        /* Set in-memory picture format to RGB 32bpp */
-        writel(0x1c,                   fbi->regbase + WMT_GOVR_COLORSPACE);
+        /*
+         * Set in-memory picture format to RGB
+         * 0x31C sets the correct color mode (RGB565) for WM8650
+         * Bit 8+9 (0x300) are ignored on WM8505 as reserved
+         */
+        writel(0x31c,                  fbi->regbase + WMT_GOVR_COLORSPACE);
         writel(1,                      fbi->regbase + WMT_GOVR_COLORSPACE1);
 
         /* Virtual buffer size */
@@ -127,6 +134,18 @@ static int wm8505fb_set_par(struct fb_info *info)
                 info->var.blue.msb_right = 0;
                 info->fix.visual = FB_VISUAL_TRUECOLOR;
                 info->fix.line_length = info->var.xres_virtual << 2;
+        } else if (info->var.bits_per_pixel == 16) {
+                info->var.red.offset = 11;
+                info->var.red.length = 5;
+                info->var.red.msb_right = 0;
+                info->var.green.offset = 5;
+                info->var.green.length = 6;
+                info->var.green.msb_right = 0;
+                info->var.blue.offset = 0;
+                info->var.blue.length = 5;
+                info->var.blue.msb_right = 0;
+                info->fix.visual = FB_VISUAL_TRUECOLOR;
+                info->fix.line_length = info->var.xres_virtual << 1;
         }
 
         wm8505fb_set_timing(info);
@@ -246,16 +265,20 @@ static int __devinit wm8505fb_probe(struct platform_device *pdev)
         struct wm8505fb_info    *fbi;
         struct resource         *res;
         void                    *addr;
-        struct vt8500fb_platform_data *pdata;
         int ret;
 
-        pdata = pdev->dev.platform_data;
+        struct fb_videomode     of_mode;
+        struct device_node      *np;
+        u32                     bpp;
+        dma_addr_t fb_mem_phys;
+        unsigned long fb_mem_len;
+        void *fb_mem_virt;
 
         ret = -ENOMEM;
         fbi = NULL;
 
-        fbi = kzalloc(sizeof(struct wm8505fb_info) + sizeof(u32) * 16,
-                                                        GFP_KERNEL);
+        fbi = devm_kzalloc(&pdev->dev, sizeof(struct wm8505fb_info) +
+                        sizeof(u32) * 16, GFP_KERNEL);
         if (!fbi) {
                 dev_err(&pdev->dev, "Failed to initialize framebuffer device\n");
                 ret = -ENOMEM;
@@ -305,21 +328,58 @@ static int __devinit wm8505fb_probe(struct platform_device *pdev)
                 goto failed_free_res;
         }
 
-        fb_videomode_to_var(&fbi->fb.var, &pdata->mode);
+        np = of_parse_phandle(pdev->dev.of_node, "default-mode", 0);
+        if (!np) {
+                pr_err("%s: No display description in Device Tree\n", __func__);
+                ret = -EINVAL;
+                goto failed_free_res;
+        }
+
+        /*
+         * This code is copied from Sascha Hauer's of_videomode helper
+         * and can be replaced with a call to the helper once mainlined
+         */
+        ret = 0;
+        ret |= of_property_read_u32(np, "hactive", &of_mode.xres);
+        ret |= of_property_read_u32(np, "vactive", &of_mode.yres);
+        ret |= of_property_read_u32(np, "hback-porch", &of_mode.left_margin);
+        ret |= of_property_read_u32(np, "hfront-porch", &of_mode.right_margin);
+        ret |= of_property_read_u32(np, "hsync-len", &of_mode.hsync_len);
+        ret |= of_property_read_u32(np, "vback-porch", &of_mode.upper_margin);
+        ret |= of_property_read_u32(np, "vfront-porch", &of_mode.lower_margin);
+        ret |= of_property_read_u32(np, "vsync-len", &of_mode.vsync_len);
+        ret |= of_property_read_u32(np, "bpp", &bpp);
+        if (ret) {
+                pr_err("%s: Unable to read display properties\n", __func__);
+                goto failed_free_res;
+        }
+
+        of_mode.vmode = FB_VMODE_NONINTERLACED;
+        fb_videomode_to_var(&fbi->fb.var, &of_mode);
 
         fbi->fb.var.nonstd              = 0;
         fbi->fb.var.activate            = FB_ACTIVATE_NOW;
 
         fbi->fb.var.height              = -1;
         fbi->fb.var.width               = -1;
-        fbi->fb.var.xres_virtual        = pdata->xres_virtual;
-        fbi->fb.var.yres_virtual        = pdata->yres_virtual;
-        fbi->fb.var.bits_per_pixel      = pdata->bpp;
 
-        fbi->fb.fix.smem_start  = pdata->video_mem_phys;
-        fbi->fb.fix.smem_len    = pdata->video_mem_len;
-        fbi->fb.screen_base     = pdata->video_mem_virt;
-        fbi->fb.screen_size     = pdata->video_mem_len;
+        /* try allocating the framebuffer */
+        fb_mem_len = of_mode.xres * of_mode.yres * 2 * (bpp / 8);
+        fb_mem_virt = dma_alloc_coherent(&pdev->dev, fb_mem_len, &fb_mem_phys,
+                                GFP_KERNEL);
+        if (!fb_mem_virt) {
+                pr_err("%s: Failed to allocate framebuffer\n", __func__);
+                return -ENOMEM;
+        };
+
+        fbi->fb.var.xres_virtual        = of_mode.xres;
+        fbi->fb.var.yres_virtual        = of_mode.yres * 2;
+        fbi->fb.var.bits_per_pixel      = bpp;
+
+        fbi->fb.fix.smem_start          = fb_mem_phys;
+        fbi->fb.fix.smem_len            = fb_mem_len;
+        fbi->fb.screen_base             = fb_mem_virt;
+        fbi->fb.screen_size             = fb_mem_len;
 
         if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {
                 dev_err(&pdev->dev, "Failed to allocate color map\n");
@@ -395,12 +455,18 @@ static int __devexit wm8505fb_remove(struct platform_device *pdev)
         return 0;
 }
 
+static const struct of_device_id wmt_dt_ids[] = {
+        { .compatible = "wm,wm8505-fb", },
+        {}
+};
+
 static struct platform_driver wm8505fb_driver = {
         .probe          = wm8505fb_probe,
         .remove         = __devexit_p(wm8505fb_remove),
         .driver         = {
                 .owner  = THIS_MODULE,
                 .name   = DRIVER_NAME,
+                .of_match_table = of_match_ptr(wmt_dt_ids),
         },
 };
 
@@ -408,4 +474,5 @@ module_platform_driver(wm8505fb_driver);
 
 MODULE_AUTHOR("Ed Spiridonov <edo.rus@gmail.com>");
 MODULE_DESCRIPTION("Framebuffer driver for WMT WM8505");
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("GPL v2");
+MODULE_DEVICE_TABLE(of, wmt_dt_ids);