1 files changed, 28 insertions, 6 deletions

diff --git a/drivers/mtd/maps/amd76xrom.c b/drivers/mtd/maps/amd76xrom.c
index 797caffb20b1..78b671172bb2 100644
--- a/drivers/mtd/maps/amd76xrom.c
+++ b/drivers/mtd/maps/amd76xrom.c
@@ -7,6 +7,7 @@
 
 #include <linux/module.h>
 #include <linux/types.h>
+#include <linux/version.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <asm/io.h>
@@ -44,6 +45,23 @@ struct amd76xrom_map_info {
         char map_name[sizeof(MOD_NAME) + 2 + ADDRESS_NAME_LEN];
 };
 
+/* The 2 bits controlling the window size are often set to allow reading
+ * the BIOS, but too small to allow writing, since the lock registers are
+ * 4MiB lower in the address space than the data.
+ *
+ * This is intended to prevent flashing the bios, perhaps accidentally.
+ *
+ * This parameter allows the normal driver to over-ride the BIOS settings.
+ *
+ * The bits are 6 and 7.  If both bits are set, it is a 5MiB window.
+ * If only the 7 Bit is set, it is a 4MiB window.  Otherwise, a
+ * 64KiB window.
+ *
+ */
+static uint win_size_bits;
+module_param(win_size_bits, uint, 0);
+MODULE_PARM_DESC(win_size_bits, "ROM window size bits override for 0x43 byte, normally set by BIOS.");
+
 static struct amd76xrom_window amd76xrom_window = {
         .maps = LIST_HEAD_INIT(amd76xrom_window.maps),
 };
@@ -95,6 +113,16 @@ static int __devinit amd76xrom_init_one (struct pci_dev *pdev,
         /* Remember the pci dev I find the window in - already have a ref */
         window->pdev = pdev;
 
+        /* Enable the selected rom window.  This is often incorrectly
+         * set up by the BIOS, and the 4MiB offset for the lock registers
+         * requires the full 5MiB of window space.
+         *
+         * This 'write, then read' approach leaves the bits for
+         * other uses of the hardware info.
+         */
+        pci_read_config_byte(pdev, 0x43, &byte);
+        pci_write_config_byte(pdev, 0x43, byte | win_size_bits );
+
         /* Assume the rom window is properly setup, and find it's size */
         pci_read_config_byte(pdev, 0x43, &byte);
         if ((byte & ((1<<7)|(1<<6))) == ((1<<7)|(1<<6))) {
@@ -129,12 +157,6 @@ static int __devinit amd76xrom_init_one (struct pci_dev *pdev,
                         (unsigned long long)window->rsrc.end);
         }
 
-#if 0
-
-        /* Enable the selected rom window */
-        pci_read_config_byte(pdev, 0x43, &byte);
-        pci_write_config_byte(pdev, 0x43, byte | rwindow->segen_bits);
-#endif
 
         /* Enable writes through the rom window */
         pci_read_config_byte(pdev, 0x40, &byte);