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authorCorey Minyard <cminyard@mvista.com>2012-10-16 15:53:40 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-16 18:07:12 -0700
commita6c16c2803089f032f86fe15e952176c0713d6e3 (patch)
tree2705c4c5df91ffc31d8ccf2914d1ac67b1f7d901 /drivers/char
parent9ebca93bf3b350910c66516cbec68899eeddfd8e (diff)
downloadop-kernel-dev-a6c16c2803089f032f86fe15e952176c0713d6e3.zip
op-kernel-dev-a6c16c2803089f032f86fe15e952176c0713d6e3.tar.gz
IPMI: Detect register spacing on PCI interfaces
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>
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/ipmi/ipmi_si_intf.c36
1 files changed, 34 insertions, 2 deletions
diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
index 83f85cf..32a6c7e 100644
--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -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;
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