video: mb862xxfb: relocate register space to get contiguous vram

By default the GDC registers are located in the middle of the 64MiB
area for video RAM and registers. When 32MiB VRAM or more is used,
relocate the register space to the top of the 64MiB space so that
we get the contiguous VRAM for GDC frame buffer layers, drawing
frames, capture and cursor buffers.

Signed-off-by: Anatolij Gustschin <agust@denx.de>

2 files changed, 15 insertions, 5 deletions

diff --git a/drivers/video/mb862xx/mb862xx_reg.h b/drivers/video/mb862xx/mb862xx_reg.h
index 2ba65e118500..737fc011caff 100644
--- a/drivers/video/mb862xx/mb862xx_reg.h
+++ b/drivers/video/mb862xx/mb862xx_reg.h
@@ -5,11 +5,8 @@
 #ifndef _MB862XX_REG_H
 #define _MB862XX_REG_H
 
-#ifdef MB862XX_MMIO_BOTTOM
-#define MB862XX_MMIO_BASE       0x03fc0000
-#else
 #define MB862XX_MMIO_BASE       0x01fc0000
-#endif
+#define MB862XX_MMIO_HIGH_BASE  0x03fc0000
 #define MB862XX_I2C_BASE        0x0000c000
 #define MB862XX_DISP_BASE       0x00010000
 #define MB862XX_CAP_BASE        0x00018000
@@ -23,6 +20,7 @@
 #define GC_IMASK                0x00000024
 #define GC_SRST                 0x0000002c
 #define GC_CCF                  0x00000038
+#define GC_RSW                  0x0000005c
 #define GC_CID                  0x000000f0
 #define GC_REVISION             0x00000084
 
diff --git a/drivers/video/mb862xx/mb862xxfb.c b/drivers/video/mb862xx/mb862xxfb.c
index a1b81e73394c..ffb6a2c36d3c 100644
--- a/drivers/video/mb862xx/mb862xxfb.c
+++ b/drivers/video/mb862xx/mb862xxfb.c
@@ -742,6 +742,12 @@ static int coralp_init(struct mb862xxfb_par *par)
 
         par->refclk = GC_DISP_REFCLK_400;
 
+        if (par->mapped_vram >= 0x2000000) {
+                /* relocate gdc registers space */
+                writel(1, par->fb_base + MB862XX_MMIO_BASE + GC_RSW);
+                udelay(1); /* wait at least 20 bus cycles */
+        }
+
         ver = inreg(host, GC_CID);
         cn = (ver & GC_CID_CNAME_MSK) >> 8;
         ver = ver & GC_CID_VERSION_MSK;
@@ -907,7 +913,13 @@ static int __devinit mb862xx_pci_probe(struct pci_dev *pdev,
         case PCI_DEVICE_ID_FUJITSU_CORALPA:
                 par->fb_base_phys = pci_resource_start(par->pdev, 0);
                 par->mapped_vram = CORALP_MEM_SIZE;
-                par->mmio_base_phys = par->fb_base_phys + MB862XX_MMIO_BASE;
+                if (par->mapped_vram >= 0x2000000) {
+                        par->mmio_base_phys = par->fb_base_phys +
+                                              MB862XX_MMIO_HIGH_BASE;
+                } else {
+                        par->mmio_base_phys = par->fb_base_phys +
+                                              MB862XX_MMIO_BASE;
+                }
                 par->mmio_len = MB862XX_MMIO_SIZE;
                 par->type = BT_CORALP;
                 break;