[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>

diff --git a/drivers/i2c/busses/scx200_acb.c b/drivers/i2c/busses/scx200_acb.c
index 02150bb..0ae77f8 100644 (file)
--- a/drivers/i2c/busses/scx200_acb.c
+++ b/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;
+       if (pci_dev_present(scx200)) {
+               for (i = 0; i < MAX_DEVICES; ++i) {
+                       if (base[i] > 0)
+                               rc = scx200_acb_create("SCx200", base[i], i);
+               }
+       } else if (pci_dev_present(divil_pci))
+               rc = scx200_add_cs553x();
 
-       rc = -ENXIO;
-       for (i = 0; i < MAX_DEVICES; ++i) {
-               if (base[i] > 0)
-                       rc = scx200_acb_create(base[i], i);
-       }
-       if (scx200_acb_list)
-               return 0;
        return rc;
 }