Resend: Determine SCx200 CB address at run-time

diff -urp linux-2.6.11/arch/i386/kernel/scx200.c linux-2.6.11-scx200/arch/i386/kernel/scx200.c
@@ -13,6 +13,9 @@
 
 #include <linux/scx200.h>
 
+/* Verify that the configuration block really is there */
+#define scx200_cb_probe(base) (inw((base) + SCx200_CBA) == (base))
+
 #define NAME "scx200"
 
 MODULE_AUTHOR("Christer Weinigel <[email protected]>");

@@ -22,9 +25,13 @@ MODULE_LICENSE("GPL");
 unsigned scx200_gpio_base = 0;
 long scx200_gpio_shadow[2];
 
+unsigned scx200_cb_base = 0;
+
 static struct pci_device_id scx200_tbl[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_BRIDGE) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_XBUS)   },
+	{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_XBUS)   },
 	{ },
 };
 MODULE_DEVICE_TABLE(pci,scx200_tbl);

@@ -45,22 +52,39 @@ static int __devinit scx200_probe(struct
 	int bank;
 	unsigned base;
 
-	base = pci_resource_start(pdev, 0);
-	printk(KERN_INFO NAME ": GPIO base 0x%x\n", base);
-
-	if (request_region(base, SCx200_GPIO_SIZE, "NatSemi SCx200 GPIO") == 0) {
-		printk(KERN_ERR NAME ": can't allocate I/O for GPIOs\n");
-		return -EBUSY;
+	if (pdev->device == PCI_DEVICE_ID_NS_SCx200_BRIDGE ||
+	    pdev->device == PCI_DEVICE_ID_NS_SC1100_BRIDGE) {
+		base = pci_resource_start(pdev, 0);
+		printk(KERN_INFO NAME ": GPIO base 0x%x\n", base);
+
+		if (request_region(base, SCx200_GPIO_SIZE, "NatSemi SCx200 GPIO") == 0) {
+			printk(KERN_ERR NAME ": can't allocate I/O for GPIOs\n");
+			return -EBUSY;
+		}
+
+		scx200_gpio_base = base;
+
+		/* read the current values driven on the GPIO signals */
+		for (bank = 0; bank < 2; ++bank)
+			scx200_gpio_shadow[bank] = inl(scx200_gpio_base + 0x10 * bank);
+
+	} else {
+		/* find the base of the Configuration Block */
+		if (scx200_cb_probe(SCx200_CB_BASE_FIXED)) {
+			scx200_cb_base = SCx200_CB_BASE_FIXED;
+		} else {
+			pci_read_config_dword(pdev, SCx200_CBA_SCRATCH, &base);
+			if (scx200_cb_probe(base)) {
+				scx200_cb_base = base;
+			} else {
+				printk(KERN_WARNING NAME ": Configuration Block not found\n");
+				return -ENODEV;
+			}
+		}
+		printk(KERN_INFO NAME ": Configuration Block base 0x%x\n", scx200_cb_base);
 	}
 
-	scx200_gpio_base = base;
-
-	/* read the current values driven on the GPIO signals */
-	for (bank = 0; bank < 2; ++bank)
-		scx200_gpio_shadow[bank] = inl(scx200_gpio_base + 0x10 * bank);
-
 	return 0;
-
 }
 
 u32 scx200_gpio_configure(int index, u32 mask, u32 bits)

@@ -134,6 +158,7 @@ EXPORT_SYMBOL(scx200_gpio_shadow);
 EXPORT_SYMBOL(scx200_gpio_lock);
 EXPORT_SYMBOL(scx200_gpio_configure);
 EXPORT_SYMBOL(scx200_gpio_dump);
+EXPORT_SYMBOL(scx200_cb_base);
 
 /*
     Local variables:

95 lines not on this page · raw message

diff -urp linux-2.6.11/drivers/mtd/maps/scx200_docflash.c linux-2.6.11-scx200/drivers/mtd/maps/scx200_docflash.c
@@ -92,17 +92,16 @@ static int __init init_scx200_docflash(v
 				      PCI_DEVICE_ID_NS_SCx200_BRIDGE,
 				      NULL)) == NULL)
 		return -ENODEV;
-	
-	if (!scx200_cb_probe(SCx200_CB_BASE)) {
-		printk(KERN_WARNING NAME ": no configuration block found\n");
+
+	/* check that we have found the configuration block */
+	if (!scx200_cb_present())
 		return -ENODEV;
-	}
 
 	if (probe) {
 		/* Try to use the present flash mapping if any */
 		pci_read_config_dword(bridge, SCx200_DOCCS_BASE, &base);
 		pci_read_config_dword(bridge, SCx200_DOCCS_CTRL, &ctrl);
-		pmr = inl(SCx200_CB_BASE + SCx200_PMR);
+		pmr = inl(scx200_cb_base + SCx200_PMR);
 
 		if (base == 0
 		    || (ctrl & 0x07000000) != 0x07000000

@@ -155,14 +154,14 @@ static int __init init_scx200_docflash(v
 		
 		pci_write_config_dword(bridge, SCx200_DOCCS_BASE, docmem.start);
 		pci_write_config_dword(bridge, SCx200_DOCCS_CTRL, ctrl);
-		pmr = inl(SCx200_CB_BASE + SCx200_PMR);
+		pmr = inl(scx200_cb_base + SCx200_PMR);
 		
 		if (width == 8) {
 			pmr &= ~(1<<6);
 		} else {
 			pmr |= (1<<6);
 		}
-		outl(pmr, SCx200_CB_BASE + SCx200_PMR);
+		outl(pmr, scx200_cb_base + SCx200_PMR);
 	}
 	
        	printk(KERN_INFO NAME ": DOCCS mapped at 0x%lx-0x%lx, width %d\n", 

diff -urp linux-2.6.11/include/linux/pci_ids.h linux-2.6.11-scx200/include/linux/pci_ids.h
@@ -386,6 +386,8 @@
 #define PCI_DEVICE_ID_NS_SCx200_VIDEO	0x0504
 #define PCI_DEVICE_ID_NS_SCx200_XBUS	0x0505
 #define PCI_DEVICE_ID_NS_SC1100_BRIDGE	0x0510
+#define PCI_DEVICE_ID_NS_SC1100_SMI	0x0511
+#define PCI_DEVICE_ID_NS_SC1100_XBUS	0x0515
 #define PCI_DEVICE_ID_NS_87410		0xd001
 
 #define PCI_VENDOR_ID_TSENG		0x100c

diff -urp linux-2.6.11/include/linux/scx200.h linux-2.6.11-scx200/include/linux/scx200.h
@@ -7,6 +7,10 @@
 
 /* Interesting stuff for the National Semiconductor SCx200 CPU */
 
+extern unsigned scx200_cb_base;
+
+#define scx200_cb_present() (scx200_cb_base!=0)
+
 /* F0 PCI Header/Bridge Configuration Registers */
 #define SCx200_DOCCS_BASE 0x78	/* DOCCS Base Address Register */
 #define SCx200_DOCCS_CTRL 0x7c	/* DOCCS Control Register */

@@ -15,7 +19,7 @@
 #define SCx200_GPIO_SIZE 0x2c	/* Size of GPIO register block */
 
 /* General Configuration Block */
-#define SCx200_CB_BASE 0x9000	/* Base fixed at 0x9000 according to errata */
+#define SCx200_CB_BASE_FIXED 0x9000	/* Base fixed at 0x9000 according to errata? */
 
 /* Watchdog Timer */
 #define SCx200_WDT_OFFSET 0x00	/* offset within configuration block */

@@ -44,9 +48,7 @@
 #define SCx200_IID 0x3c		/* IA On a Chip Identification Number Reg */
 #define SCx200_REV 0x3d		/* Revision Register */
 #define SCx200_CBA 0x3e		/* Configuration Base Address Register */
-
-/* Verify that the configuration block really is there */
-#define scx200_cb_probe(base) (inw((base) + SCx200_CBA) == (base))
+#define SCx200_CBA_SCRATCH 0x64	/* Configuration Base Address Scratchpad */
 
 /*
     Local variables: