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IPMI: Detect register spacing on PCI interfaces

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The IPMI spec defines a way to detect register spacing for PCI interfaces,
so implement it.

Signed-off-by: Steven Hsieh <sshsieh@broadcom.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Corey Minyard 2012-10-16 15:53:40 -05:00 committed by Linus Torvalds
parent 9ebca93bf3
commit a6c16c2803
1 changed files with 34 additions and 2 deletions
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36
drivers/char/ipmi/ipmi_si_intf.c
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@ -2424,6 +2424,38 @@ static void ipmi_pci_cleanup(struct smi_info *info)
pci_disable_device(pdev);
}
static int __devinit ipmi_pci_probe_regspacing(struct smi_info *info)
{
if (info->si_type == SI_KCS) {
unsigned char status;
int regspacing;
info->io.regsize = DEFAULT_REGSIZE;
info->io.regshift = 0;
info->io_size = 2;
info->handlers = &kcs_smi_handlers;
/* detect 1, 4, 16byte spacing */
for (regspacing = DEFAULT_REGSPACING; regspacing <= 16;) {
info->io.regspacing = regspacing;
if (info->io_setup(info)) {
dev_err(info->dev,
"Could not setup I/O space\n");
return DEFAULT_REGSPACING;
}
/* write invalid cmd */
info->io.outputb(&info->io, 1, 0x10);
/* read status back */
status = info->io.inputb(&info->io, 1);
info->io_cleanup(info);
if (status)
return regspacing;
regspacing *= 4;
}
}
return DEFAULT_REGSPACING;
}
static int __devinit ipmi_pci_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
@ -2476,8 +2508,8 @@ static int __devinit ipmi_pci_probe(struct pci_dev *pdev,
}
info->io.addr_data = pci_resource_start(pdev, 0);
info->io.regspacing = DEFAULT_REGSPACING;
info->io.regsize = DEFAULT_REGSPACING;
info->io.regspacing = ipmi_pci_probe_regspacing(info);
info->io.regsize = DEFAULT_REGSIZE;
info->io.regshift = 0;
info->irq = pdev->irq;