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siemens/mc_apl5: Disable PCI clock outputs on XIO bridges 

On this mainboard there are legacy PCI device, which are connected to
different PCIe root ports via PCIe-2-PCI bridges. This patch disables
the unused PCI clock outputs on the XIO2001 PCI Express to PCI Bridges.

Change-Id: Id36e39c4568f5dd241cd864d2e75365abd0f2a91
Signed-off-by: Mario Scheithauer <mario.scheithauer@siemens.com>
Reviewed-on: https://review.coreboot.org/c/29882
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Mario Scheithauer 2018-11-28 09:21:58 +01:00 committed by Patrick Georgi
parent a94a153477
commit 1a5ce95815
1 changed files with 16 additions and 5 deletions
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21
src/mainboard/siemens/mc_apl1/variants/mc_apl5/mainboard.c
View File

@ -52,11 +52,6 @@ void variant_mainboard_final(void)
*/
pcr_write16(PID_ITSS, 0x314c, 0x0321);
/* Disable clock outputs 1-5 (CLKOUT) for XIO2001 PCIe to PCI Bridge. */
dev = dev_find_device(PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XIO2001, 0);
if (dev)
pci_write_config8(dev, 0xd8, 0x3e);
/* Enable CLKRUN_EN for power gating LPC */
lpc_enable_pci_clk_cntl();
@ -82,6 +77,22 @@ void variant_mainboard_final(void)
cmd = pci_read_config16(dev, PCI_COMMAND);
cmd |= PCI_COMMAND_MASTER;
pci_write_config16(dev, PCI_COMMAND, cmd);
/* Disable clock outputs 0-3 (CLKOUT) for upstream XIO2001 PCIe
* to PCI Bridge. */
struct device *parent = dev->bus->dev;
if (parent && parent->device == PCI_DEVICE_ID_TI_XIO2001)
pci_write_config8(parent, 0xd8, 0x0f);
}
/* Disable clock outputs 1-5 (CLKOUT) for another XIO2001 PCIe to PCI
* Bridge on this mainboard.
*/
dev = dev_find_device(PCI_VENDOR_ID_SIEMENS, 0x403f, 0);
if (dev) {
struct device *parent = dev->bus->dev;
if (parent && parent->device == PCI_DEVICE_ID_TI_XIO2001)
pci_write_config8(parent, 0xd8, 0x3e);
}
}