i2c-ali1535: enable SPARC support

The i2c-ali1535 driver doesn't work on SPARC, because it assumes that
ioport address are 16-bit wide (address stored in an unsigned short).
But on SPARC arch, ioports are mapped in memory and so must be stored
in an unsigned long.

Use pci_resource_start for getting IOMEM base address, then read the
SMBBA of the i2c bus and use these together for I/O access.

I would like to thank Jean DELVARE for reviewing my patch.

Signed-off-by: LABBE Corentin <corentin.labbe@geomatys.fr>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

diff --git a/drivers/i2c/busses/i2c-ali1535.c b/drivers/i2c/busses/i2c-ali1535.c
index 5b667e53a8136b8633e9b46c1b4624c3ec3a648a..e66d248fc126b8ffe4f9d85e45f82a76c5ee9bf7 100644 (file)
--- a/drivers/i2c/busses/i2c-ali1535.c
+++ b/drivers/i2c/busses/i2c-ali1535.c
@@ -132,7 +132,8 @@
 #define        ALI1535_SMBIO_EN        0x04    /* SMB I/O Space enable         */
 
 static struct pci_driver ali1535_driver;
-static unsigned short ali1535_smba;
+static unsigned long ali1535_smba;
+static unsigned short ali1535_offset;
 
 /* Detect whether a ALI1535 can be found, and initialize it, where necessary.
    Note the differences between kernels with the old PCI BIOS interface and
@@ -149,16 +150,28 @@ static int __devinit ali1535_setup(struct pci_dev *dev)
                - We can use the addresses
        */
 
+       retval = pci_enable_device(dev);
+       if (retval) {
+               dev_err(&dev->dev, "ALI1535_smb can't enable device\n");
+               goto exit;
+       }
+
        /* Determine the address of the SMBus area */
-       pci_read_config_word(dev, SMBBA, &ali1535_smba);
-       ali1535_smba &= (0xffff & ~(ALI1535_SMB_IOSIZE - 1));
-       if (ali1535_smba == 0) {
+       pci_read_config_word(dev, SMBBA, &ali1535_offset);
+       dev_dbg(&dev->dev, "ALI1535_smb is at offset 0x%04x\n", ali1535_offset);
+       ali1535_offset &= (0xffff & ~(ALI1535_SMB_IOSIZE - 1));
+       if (ali1535_offset == 0) {
                dev_warn(&dev->dev,
                        "ALI1535_smb region uninitialized - upgrade BIOS?\n");
                retval = -ENODEV;
                goto exit;
        }
 
+       if (pci_resource_flags(dev, 0) & IORESOURCE_IO)
+               ali1535_smba = pci_resource_start(dev, 0) + ali1535_offset;
+       else
+               ali1535_smba = ali1535_offset;
+
        retval = acpi_check_region(ali1535_smba, ALI1535_SMB_IOSIZE,
                                   ali1535_driver.name);
        if (retval)
@@ -166,7 +179,7 @@ static int __devinit ali1535_setup(struct pci_dev *dev)
 
        if (!request_region(ali1535_smba, ALI1535_SMB_IOSIZE,
                            ali1535_driver.name)) {
-               dev_err(&dev->dev, "ALI1535_smb region 0x%x already in use!\n",
+               dev_err(&dev->dev, "ALI1535_smb region 0x%lx already in use!\n",
                        ali1535_smba);
                retval = -EBUSY;
                goto exit;
@@ -200,7 +213,7 @@ static int __devinit ali1535_setup(struct pci_dev *dev)
        */
        pci_read_config_byte(dev, SMBREV, &temp);
        dev_dbg(&dev->dev, "SMBREV = 0x%X\n", temp);
-       dev_dbg(&dev->dev, "ALI1535_smba = 0x%X\n", ali1535_smba);
+       dev_dbg(&dev->dev, "ALI1535_smba = 0x%lx\n", ali1535_smba);
 
        return 0;
 
@@ -501,7 +514,7 @@ static int __devinit ali1535_probe(struct pci_dev *dev, const struct pci_device_
        ali1535_adapter.dev.parent = &dev->dev;
 
        snprintf(ali1535_adapter.name, sizeof(ali1535_adapter.name),
-               "SMBus ALI1535 adapter at %04x", ali1535_smba);
+               "SMBus ALI1535 adapter at %04x", ali1535_offset);
        return i2c_add_adapter(&ali1535_adapter);
 }