[POWERPC] XilinxFB: Split device setup from bus binding

Split the device setup code away from the platform bus binding.  This is
in preparation for adding the of_platform bus binding to this driver and
most of the setup code is common between the two busses.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Andrei Konovalov <akonovalov@ru.mvista.com>

1 files changed, 80 insertions, 53 deletions

diff --git a/drivers/video/xilinxfb.c b/drivers/video/xilinxfb.c
index 9aa754a25218..12d91279996d 100644
--- a/drivers/video/xilinxfb.c
+++ b/drivers/video/xilinxfb.c
@@ -196,23 +196,17 @@ static struct fb_ops xilinxfb_ops =
         .fb_imageblit           = cfb_imageblit,
 };
 
-/* === The device driver === */
+/* ---------------------------------------------------------------------
+ * Bus independent setup/teardown
+ */
 
-static int
-xilinxfb_drv_probe(struct device *dev)
+static int xilinxfb_assign(struct device *dev, unsigned long physaddr,
+                           int width_mm, int height_mm, int rotate)
 {
-        struct platform_device *pdev;
-        struct xilinxfb_platform_data *pdata;
         struct xilinxfb_drvdata *drvdata;
-        struct resource *regs_res;
-        int retval;
-
-        if (!dev)
-                return -EINVAL;
-
-        pdev = to_platform_device(dev);
-        pdata = pdev->dev.platform_data;
+        int rc;
 
+        /* Allocate the driver data region */
         drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL);
         if (!drvdata) {
                 dev_err(dev, "Couldn't allocate device private record\n");
@@ -221,40 +215,39 @@ xilinxfb_drv_probe(struct device *dev)
         dev_set_drvdata(dev, drvdata);
 
         /* Map the control registers in */
-        regs_res = platform_get_resource(pdev, IORESOURCE_IO, 0);
-        if (!regs_res || (regs_res->end - regs_res->start + 1 < 8)) {
-                dev_err(dev, "Couldn't get registers resource\n");
-                retval = -EFAULT;
+        if (!request_mem_region(physaddr, 8, DRIVER_NAME)) {
+                dev_err(dev, "Couldn't lock memory region at 0x%08lX\n",
+                        physaddr);
+                rc = -ENODEV;
                 goto err_region;
         }
-
-        if (!request_mem_region(regs_res->start, 8, DRIVER_NAME)) {
-                dev_err(dev, "Couldn't lock memory region at 0x%08X\n",
-                       regs_res->start);
-                retval = -EBUSY;
-                goto err_region;
+        drvdata->regs_phys = physaddr;
+        drvdata->regs = ioremap(physaddr, 8);
+        if (!drvdata->regs) {
+                dev_err(dev, "Couldn't lock memory region at 0x%08lX\n",
+                        physaddr);
+                rc = -ENODEV;
+                goto err_map;
         }
-        drvdata->regs = (u32 __iomem*) ioremap(regs_res->start, 8);
-        drvdata->regs_phys = regs_res->start;
 
         /* Allocate the framebuffer memory */
         drvdata->fb_virt = dma_alloc_coherent(dev, PAGE_ALIGN(FB_SIZE),
                                 &drvdata->fb_phys, GFP_KERNEL);
         if (!drvdata->fb_virt) {
                 dev_err(dev, "Could not allocate frame buffer memory\n");
-                retval = -ENOMEM;
+                rc = -ENOMEM;
                 goto err_fbmem;
         }
 
         /* Clear (turn to black) the framebuffer */
-        memset_io((void *) drvdata->fb_virt, 0, FB_SIZE);
+        memset_io(drvdata->fb_virt, 0, FB_SIZE);
 
         /* Tell the hardware where the frame buffer is */
         xilinx_fb_out_be32(drvdata, REG_FB_ADDR, drvdata->fb_phys);
 
         /* Turn on the display */
         drvdata->reg_ctrl_default = REG_CTRL_ENABLE;
-        if (pdata && pdata->rotate_screen)
+        if (rotate)
                 drvdata->reg_ctrl_default |= REG_CTRL_ROTATE;
         xilinx_fb_out_be32(drvdata, REG_CTRL, drvdata->reg_ctrl_default);
 
@@ -265,31 +258,29 @@ xilinxfb_drv_probe(struct device *dev)
         drvdata->info.fix = xilinx_fb_fix;
         drvdata->info.fix.smem_start = drvdata->fb_phys;
         drvdata->info.pseudo_palette = drvdata->pseudo_palette;
+        drvdata->info.flags = FBINFO_DEFAULT;
+        drvdata->info.var = xilinx_fb_var;
+
+        xilinx_fb_var.height = height_mm;
+        xilinx_fb_var.width = width_mm;
 
-        if (fb_alloc_cmap(&drvdata->info.cmap, PALETTE_ENTRIES_NO, 0) < 0) {
+        /* Allocate a colour map */
+        rc = fb_alloc_cmap(&drvdata->info.cmap, PALETTE_ENTRIES_NO, 0);
+        if (rc) {
                 dev_err(dev, "Fail to allocate colormap (%d entries)\n",
                         PALETTE_ENTRIES_NO);
-                retval = -EFAULT;
                 goto err_cmap;
         }
 
-        drvdata->info.flags = FBINFO_DEFAULT;
-        if (pdata) {
-                xilinx_fb_var.height = pdata->screen_height_mm;
-                xilinx_fb_var.width = pdata->screen_width_mm;
-        }
-        drvdata->info.var = xilinx_fb_var;
-
         /* Register new frame buffer */
-        if (register_framebuffer(&drvdata->info) < 0) {
+        rc = register_framebuffer(&drvdata->info);
+        if (rc) {
                 dev_err(dev, "Could not register frame buffer\n");
-                retval = -EINVAL;
                 goto err_regfb;
         }
 
         /* Put a banner in the log (for DEBUG) */
-        dev_dbg(dev, "regs: phys=%x, virt=%p\n",
-                drvdata->regs_phys, drvdata->regs);
+        dev_dbg(dev, "regs: phys=%lx, virt=%p\n", physaddr, drvdata->regs);
         dev_dbg(dev, "fb: phys=%p, virt=%p, size=%x\n",
                 (void*)drvdata->fb_phys, drvdata->fb_virt, FB_SIZE);
         return 0;       /* success */
@@ -300,30 +291,25 @@ err_regfb:
 err_cmap:
         dma_free_coherent(dev, PAGE_ALIGN(FB_SIZE), drvdata->fb_virt,
                 drvdata->fb_phys);
-
         /* Turn off the display */
         xilinx_fb_out_be32(drvdata, REG_CTRL, 0);
-        iounmap(drvdata->regs);
 
 err_fbmem:
-        release_mem_region(regs_res->start, 8);
+        iounmap(drvdata->regs);
+
+err_map:
+        release_mem_region(physaddr, 8);
 
 err_region:
         kfree(drvdata);
         dev_set_drvdata(dev, NULL);
 
-        return retval;
+        return rc;
 }
 
-static int
-xilinxfb_drv_remove(struct device *dev)
+static int xilinxfb_release(struct device *dev)
 {
-        struct xilinxfb_drvdata *drvdata;
-
-        if (!dev)
-                return -ENODEV;
-
-        drvdata = (struct xilinxfb_drvdata *) dev_get_drvdata(dev);
+        struct xilinxfb_drvdata *drvdata = dev_get_drvdata(dev);
 
 #if !defined(CONFIG_FRAMEBUFFER_CONSOLE) && defined(CONFIG_LOGO)
         xilinx_fb_blank(VESA_POWERDOWN, &drvdata->info);
@@ -348,6 +334,47 @@ xilinxfb_drv_remove(struct device *dev)
         return 0;
 }
 
+/* ---------------------------------------------------------------------
+ * Platform bus binding
+ */
+
+static int
+xilinxfb_drv_probe(struct device *dev)
+{
+        struct platform_device *pdev;
+        struct xilinxfb_platform_data *pdata;
+        struct resource *res;
+        int width_mm;
+        int height_mm;
+        int rotate;
+
+        pdev = to_platform_device(dev);
+        pdata = pdev->dev.platform_data;
+        if (!pdata) {
+                dev_err(dev, "Missing pdata structure\n");
+                return -ENODEV;
+        }
+
+        /* Find the registers address */
+        res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+        if (!res) {
+                dev_err(dev, "Couldn't get registers resource\n");
+                return -ENODEV;
+        }
+
+        height_mm = pdata->screen_height_mm;
+        width_mm = pdata->screen_width_mm;
+        rotate = pdata->rotate_screen ? 1 : 0;
+
+        return xilinxfb_assign(dev, res->start, width_mm, height_mm, rotate);
+}
+
+static int
+xilinxfb_drv_remove(struct device *dev)
+{
+        return xilinxfb_release(dev);
+}
+
 
 static struct device_driver xilinxfb_driver = {
         .name           = DRIVER_NAME,