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southbridge/amd/sr5650: Add optional delay after link training 

Certain devices (such as the LSI SAS 2008 controller) do not
respond to PCI probes immediately after link training.  If it
is known that such a device is likely to be installed allow the
mainboard to insert an appropriate delay.

Change-Id: Ibcd9426628cacd6f88e6e3fcbc2b3eb7e3a92081
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-on: http://review.coreboot.org/11991
Reviewed-by: Edward O'Callaghan <edward.ocallaghan@koparo.com>
Tested-by: build bot (Jenkins)
This commit is contained in:
Timothy Pearson 2015-06-12 20:08:29 -05:00 committed by Nico Huber
parent a693f524ca
commit 5a0efd255d
2 changed files with 7 additions and 0 deletions
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4
src/southbridge/amd/sr5650/chip.h
View File

@ -2,6 +2,7 @@
* This file is part of the coreboot project.
*
* Copyright (C) 2010 Advanced Micro Devices, Inc.
* Copyright (C) 2015 Timothy Pearson <tpearson@raptorengineeringinc.com>, Raptor Engineering
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -27,6 +28,9 @@ struct southbridge_amd_sr5650_config
u8 gpp2_configuration; /* The configuration of General Purpose Port. */
u8 gpp3a_configuration; /* The configuration of General Purpose Port. */
u16 port_enable; /* Which port is enabled? GPP(2,3,4,5,6,7,9,10,11,12,13) */
uint32_t pcie_settling_time; /* How long to wait after link training for PCI-e devices to
* initialize before probing PCI-e busses (in microseconds).
*/
};
#endif /* SR5650_CHIP_H */

3
src/southbridge/amd/sr5650/sr5650.c
View File

@ -346,6 +346,7 @@ void sr5650_enable(device_t dev)
{
device_t nb_dev = 0, sb_dev = 0;
int dev_ind;
struct southbridge_amd_sr5650_config *cfg;
printk(BIOS_INFO, "sr5650_enable: dev=%p, VID_DID=0x%x\n", dev, get_vid_did(dev));
nb_dev = dev_find_slot(0, PCI_DEVFN(0, 0));
@ -353,6 +354,7 @@ void sr5650_enable(device_t dev)
die("sr5650_enable: CAN NOT FIND SR5650 DEVICE, HALT!\n");
/* NOT REACHED */
}
cfg = (struct southbridge_amd_sr5650_config *)nb_dev->chip_info;
/* sb_dev (dev 8) is a bridge that links to southbridge. */
sb_dev = dev_find_slot(0, PCI_DEVFN(8, 0));
@ -433,6 +435,7 @@ void sr5650_enable(device_t dev)
/* Lock HWInit Register after the last device was done */
if (dev_ind == 13) {
sr56x0_lock_hwinitreg();
udelay(cfg->pcie_settling_time);
}
}