mirror of
https://github.com/fail0verflow/switch-coreboot.git
synced 2025-05-04 01:39:18 -04:00
0c857a792e
BUG=None BRANCH=None TEST=None Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr> Reviewed-on: https://review.coreboot.org/16851 Tested-by: build bot (Jenkins) Reviewed-by: Martin Roth <martinroth@google.com> Change-Id: Ib06ecd083f00c74f1d227368811729d2944dd1ef Reviewed-on: https://chromium-review.googlesource.com/393293 Commit-Ready: Furquan Shaikh <furquan@chromium.org> Tested-by: Furquan Shaikh <furquan@chromium.org> Reviewed-by: Aaron Durbin <adurbin@chromium.org>
120 lines
3.4 KiB
C
120 lines
3.4 KiB
C
/*
|
|
* This file is part of the coreboot project.
|
|
*
|
|
* Copyright (C) 2013 Alexandru Gagniuc <mr.nuke.me@gmail.com>
|
|
*
|
|
* 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
|
|
* the Free Software Foundation, either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#include <arch/io.h>
|
|
#include <console/console.h>
|
|
#include <device/pci.h>
|
|
#include <device/pciexp.h>
|
|
#include <device/pci_ids.h>
|
|
|
|
#include "vx900.h"
|
|
|
|
/**
|
|
* @file vx900/pcie.c
|
|
*
|
|
* STATUS:
|
|
* We do part of the sequence to initialize the PCIE link. The problem is that
|
|
* the reset signal for each slot is connected to a GPO pin, but We don't know
|
|
* which GPO pin. We need to figure out which GPIO pin is hooked to which slot,
|
|
* and have a mechanism to specify this per-mainboard (devicetree.cb).
|
|
*
|
|
* There is currently no timeout detection mechanism for when a link comes up.
|
|
* If the link never comes up, we hang.
|
|
*/
|
|
|
|
static void vx900_pcie_link_init(device_t dev)
|
|
{
|
|
u8 reg8;
|
|
u32 reg32;
|
|
|
|
u8 fn = dev->path.pci.devfn & 0x07;
|
|
|
|
/* Step 1 : Check for presence of PCIE device */
|
|
reg8 = pci_read_config8(dev, 0x5a);
|
|
|
|
if (reg8 & (1 << 6))
|
|
printk(BIOS_DEBUG, "Card detected in PEX%i\n", fn);
|
|
else
|
|
return;
|
|
|
|
/* Step 2: Wait for device to enter L0 state */
|
|
/* FIXME: implement timeout detection */
|
|
while (0x8a != pci_read_config8(dev, 0x1c3));
|
|
|
|
/* Step 3: Clear PCIe error status, then check for failures */
|
|
pci_write_config32(dev, 0x104, 0xffffffff);
|
|
reg32 = pci_read_config32(dev, 0x104);
|
|
if (0 != reg32) {
|
|
printk(BIOS_DEBUG, "PEX init error. flags 0x%.8x\n", reg32);
|
|
return;
|
|
}
|
|
|
|
pci_write_config32(dev, 0x110, 0xffffffff);
|
|
reg32 = pci_read_config32(dev, 0x110);
|
|
if (0 != reg32)
|
|
printk(BIOS_DEBUG, "PEX errors. flags 0x%.8x\n", reg32);
|
|
|
|
pci_write_config8(dev, 0xa4, 0xff);
|
|
if (pci_read_config8(dev, 0x4a) & (1 << 3))
|
|
printk(BIOS_DEBUG, "Unsupported request detected.\n");
|
|
|
|
pci_write_config8(dev, 0x15a, 0xff);
|
|
if (pci_read_config8(dev, 0x15a) & (1 << 1))
|
|
printk(BIOS_DEBUG, "Negotiation pending.\n");
|
|
|
|
/* Step 4: Read vendor ID */
|
|
/* FIXME: Do we want to run through the whole sequence and delay boot
|
|
* by several seconds if the device does not respond properly the first
|
|
* time? */
|
|
}
|
|
|
|
static void vx900_pex_dev_set_resources(device_t dev)
|
|
{
|
|
assign_resources(dev->link_list);
|
|
}
|
|
|
|
static void vx900_pex_init(device_t dev)
|
|
{
|
|
/* FIXME: For some reason, PEX0 hangs on init. Find issue, fix it. */
|
|
if ((dev->path.pci.devfn & 0x7) == 0)
|
|
return;
|
|
|
|
vx900_pcie_link_init(dev);
|
|
}
|
|
|
|
static struct device_operations vx900_pex_ops = {
|
|
.read_resources = pci_bus_read_resources,
|
|
.set_resources = vx900_pex_dev_set_resources,
|
|
.enable_resources = pci_bus_enable_resources,
|
|
.init = vx900_pex_init,
|
|
.scan_bus = pciexp_scan_bridge,
|
|
.reset_bus = pci_bus_reset,
|
|
};
|
|
|
|
static const unsigned short pci_device_ids[] = {
|
|
PCI_DEVICE_ID_VIA_VX900_PEX1,
|
|
PCI_DEVICE_ID_VIA_VX900_PEX2,
|
|
PCI_DEVICE_ID_VIA_VX900_PEX3,
|
|
PCI_DEVICE_ID_VIA_VX900_PEX4,
|
|
0,
|
|
};
|
|
|
|
static const struct pci_driver pex_driver __pci_driver = {
|
|
.ops = &vx900_pex_ops,
|
|
.vendor = PCI_VENDOR_ID_VIA,
|
|
.devices = pci_device_ids,
|
|
|
|
};
|