i2c-ali1535: enable SPARC support

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

This patch corrects this by using pci_resource_start for getting IOMEM base address, then reading the SMBBA of the i2c busse and using together for I/O access.

I like to thanks Jean DELVARE for reviewing of 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);
 }