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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>
This commit is contained in:
corentin.labbe 2012-01-12 20:32:04 +01:00 committed by Jean Delvare
parent 7c1f59c9d5
commit 65a2d74b76
1 changed files with 20 additions and 7 deletions
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27
drivers/i2c/busses/i2c-ali1535.c
View File

@ -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);
}