[PATCH] i2c: scx200_acb add support for the CS5535/CS5536

scx200_acb: Add support for the CS5535/CS5536
Signed-off-by: Ben Gardner <bgardner@wabtec.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

drivers/i2c/busses/scx200_acb.c

@@ -2,6 +2,7 @@
     Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
 
     National Semiconductor SCx200 ACCESS.bus support
+    Also supports the AMD CS5535 and AMD CS5536
 
     Based on i2c-keywest.c which is:
         Copyright (c) 2001 Benjamin Herrenschmidt <benh@kernel.crashing.org>
@@ -31,6 +32,7 @@
 #include <linux/pci.h>
 #include <linux/delay.h>
 #include <asm/io.h>
+#include <asm/msr.h>
 
 #include <linux/scx200.h>
 
@@ -416,7 +418,7 @@ static int scx200_acb_probe(struct scx200_acb_iface *iface)
 	return 0;
 }
 
-static int  __init scx200_acb_create(int base, int index)
+static int  __init scx200_acb_create(const char *text, int base, int index)
 {
 	struct scx200_acb_iface *iface;
 	struct i2c_adapter *adapter;
@@ -432,7 +434,7 @@ static int  __init scx200_acb_create(int base, int index)
 
 	adapter = &iface->adapter;
 	i2c_set_adapdata(adapter, iface);
-	snprintf(adapter->name, I2C_NAME_SIZE, "SCx200 ACB%d", index);
+	snprintf(adapter->name, I2C_NAME_SIZE, "%s ACB%d", text, index);
 	adapter->owner = THIS_MODULE;
 	adapter->id = I2C_HW_SMBUS_SCX200;
 	adapter->algo = &scx200_acb_algorithm;
@@ -440,8 +442,9 @@ static int  __init scx200_acb_create(int base, int index)
 
 	init_MUTEX(&iface->sem);
 
-	snprintf(description, sizeof(description),
-		 "NatSemi SCx200 ACCESS.bus [%s]", adapter->name);
+	snprintf(description, sizeof(description), "%s ACCESS.bus [%s]",
+		 text, adapter->name);
+
 	if (request_region(base, 8, description) == 0) {
 		printk(KERN_ERR NAME ": can't allocate io 0x%x-0x%x\n",
 			base, base + 8-1);
@@ -485,24 +488,50 @@ static struct pci_device_id scx200[] = {
 	{ },
 };
 
+static struct pci_device_id divil_pci[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_NS,  PCI_DEVICE_ID_NS_CS5535_ISA) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA) },
+	{ } /* NULL entry */
+};
+
+#define MSR_LBAR_SMB		0x5140000B
+
+static int scx200_add_cs553x(void)
+{
+	u32	low, hi;
+	u32	smb_base;
+
+	/* Grab & reserve the SMB I/O range */
+	rdmsr(MSR_LBAR_SMB, low, hi);
+
+	/* Check the IO mask and whether SMB is enabled */
+	if (hi != 0x0000F001) {
+		printk(KERN_WARNING NAME ": SMBus not enabled\n");
+		return -ENODEV;
+	}
+
+	/* SMBus IO size is 8 bytes */
+	smb_base = low & 0x0000FFF8;
+
+	return scx200_acb_create("CS5535", smb_base, 0);
+}
+
 static int __init scx200_acb_init(void)
 {
 	int i;
-	int rc;
+	int	rc = -ENODEV;
 
 	pr_debug(NAME ": NatSemi SCx200 ACCESS.bus Driver\n");
 
 	/* Verify that this really is a SCx200 processor */
-	if (pci_dev_present(scx200) == 0)
-		return -ENODEV;
-
-	rc = -ENXIO;
+	if (pci_dev_present(scx200)) {
 		for (i = 0; i < MAX_DEVICES; ++i) {
 			if (base[i] > 0)
-			rc = scx200_acb_create(base[i], i);
+				rc = scx200_acb_create("SCx200", base[i], i);
 		}
-	if (scx200_acb_list)
-		return 0;
+	} else if (pci_dev_present(divil_pci))
+		rc = scx200_add_cs553x();
+
 	return rc;
 }