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baytrail: add support for disabling south cluster pci devices

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When the southcluster pci devices are listed in the devicetree add
the ability to perform the proper disabling sequence for turning
off devices. This only turns off the pci device interface as well
as put the device into D3Hot. It is not yet known how to put the TXE
device into D3Hot so it's currently not possible to disable that
device.

Also, expose the southcluster_enable_dev() function so that other
devices can call this if they require doing specific things before
disabling the device. The southcluster_enable_dev() is only called
on devices found in the devicetree and if they currently have no
ops associated with them.

BUG=chrome-os-partner:22871
BRANCH=None
TEST=Built and booted through depthcharge. Interrogated
     output to ensure devices were being properly disabled.

Change-Id: I537ddcb9379907af2fe012948542b6150a8bf7c5
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/174644
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: http://review.coreboot.org/4911
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
This commit is contained in:
Aaron Durbin
2013-10-29 16:37:10 -05:00
committed by Aaron Durbin
parent 67633a558a
commit d7bc23ac8e
5 changed files with 311 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
src/soc/intel/baytrail/chip.c
View File

@@ -53,13 +53,17 @@ static struct device_operations cpu_bus_ops = {
static void enable_dev(device_t dev)
{
printk(BIOS_DEBUG, "enable_dev(%s, %d)\n",
dev_name(dev), dev->path.type);
/* Set the operations if it is a special bus type */
if (dev->path.type == DEVICE_PATH_DOMAIN) {
dev->ops = &pci_domain_ops;
} else if (dev->path.type == DEVICE_PATH_CPU_CLUSTER) {
dev->ops = &cpu_bus_ops;
} else if (dev->path.type == DEVICE_PATH_PCI) {
/* Handle south cluster enablement. */
if (PCI_SLOT(dev->path.pci.devfn) > GFX_DEV &&
(dev->ops == NULL || dev->ops->enable == NULL)) {
southcluster_enable_dev(dev);
}
}
}