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Commit 6361d72b authored by Bjorn Helgaas's avatar Bjorn Helgaas Committed by Jesse Barnes
Browse files

x86/PCI: read Broadcom CNB20LE host bridge info before PCI scan 

We currently read the CNB20LE aperture information in a PCI quirk,
which happens after we've already created the root bus.  This patch
changes it to read the apertures earlier so we can create the root
bus with the correct resources.

I believe the CNB20LE lives at "pci 0000:00:00" based on
https://lkml.org/lkml/2010/8/13/220



CC: Ira W. Snyder <iws@ovro.caltech.edu>
CC: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
parent 2b591616

arch/x86/pci/broadcom_bus.c

+39 −23
Original line number Diff line number Diff line
@@ -15,10 +15,11 @@ 
#include <linux/pci.h>

#include <linux/init.h>

#include <asm/pci_x86.h>

#include <asm/pci-direct.h>



#include "bus_numa.h"



static void __devinit cnb20le_res(struct pci_dev *dev)

static void __init cnb20le_res(u8 bus, u8 slot, u8 func)

{

	struct pci_root_info *info;

	struct resource res;
@@ -26,21 +27,12 @@ static void __devinit cnb20le_res(struct pci_dev *dev) 
	u8 fbus, lbus;

	int i;



#ifdef CONFIG_ACPI

	/*

	 * We should get host bridge information from ACPI unless the BIOS

	 * doesn't support it.

	 */

	if (acpi_os_get_root_pointer())

		return;

#endif



	info = &pci_root_info[pci_root_num];

	pci_root_num++;



	/* read the PCI bus numbers */

	pci_read_config_byte(dev, 0x44, &fbus);

	pci_read_config_byte(dev, 0x45, &lbus);

	fbus = read_pci_config_byte(bus, slot, func, 0x44);

	lbus = read_pci_config_byte(bus, slot, func, 0x45);

	info->bus_min = fbus;

	info->bus_max = lbus;
@@ -59,8 +51,8 @@ static void __devinit cnb20le_res(struct pci_dev *dev) 
	}



	/* read the non-prefetchable memory window */

	pci_read_config_word(dev, 0xc0, &word1);

	pci_read_config_word(dev, 0xc2, &word2);

	word1 = read_pci_config_16(bus, slot, func, 0xc0);

	word2 = read_pci_config_16(bus, slot, func, 0xc2);

	if (word1 != word2) {

		res.start = (word1 << 16) | 0x0000;

		res.end   = (word2 << 16) | 0xffff;
@@ -69,8 +61,8 @@ static void __devinit cnb20le_res(struct pci_dev *dev) 
	}



	/* read the prefetchable memory window */

	pci_read_config_word(dev, 0xc4, &word1);

	pci_read_config_word(dev, 0xc6, &word2);

	word1 = read_pci_config_16(bus, slot, func, 0xc4);

	word2 = read_pci_config_16(bus, slot, func, 0xc6);

	if (word1 != word2) {

		res.start = (word1 << 16) | 0x0000;

		res.end   = (word2 << 16) | 0xffff;
@@ -79,8 +71,8 @@ static void __devinit cnb20le_res(struct pci_dev *dev) 
	}



	/* read the IO port window */

	pci_read_config_word(dev, 0xd0, &word1);

	pci_read_config_word(dev, 0xd2, &word2);

	word1 = read_pci_config_16(bus, slot, func, 0xd0);

	word2 = read_pci_config_16(bus, slot, func, 0xd2);

	if (word1 != word2) {

		res.start = word1;

		res.end   = word2;
@@ -92,13 +84,37 @@ static void __devinit cnb20le_res(struct pci_dev *dev) 
	res.start = fbus;

	res.end   = lbus;

	res.flags = IORESOURCE_BUS;

	dev_info(&dev->dev, "CNB20LE PCI Host Bridge (domain %04x %pR)\n",

			    pci_domain_nr(dev->bus), &res);

	printk(KERN_INFO "CNB20LE PCI Host Bridge (domain 0000 %pR)\n", &res);



	for (i = 0; i < info->res_num; i++)

		dev_info(&dev->dev, "host bridge window %pR\n", &info->res[i]);

		printk(KERN_INFO "host bridge window %pR\n", &info->res[i]);

}



DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_LE,

			cnb20le_res);

static int __init broadcom_postcore_init(void)

{

	u8 bus = 0, slot = 0;

	u32 id;

	u16 vendor, device;



#ifdef CONFIG_ACPI

	/*

	 * We should get host bridge information from ACPI unless the BIOS

	 * doesn't support it.

	 */

	if (acpi_os_get_root_pointer())

		return 0;

#endif



	id = read_pci_config(bus, slot, 0, PCI_VENDOR_ID);

	vendor = id & 0xffff;

	device = (id >> 16) & 0xffff;



	if (vendor == PCI_VENDOR_ID_SERVERWORKS &&

	    device == PCI_DEVICE_ID_SERVERWORKS_LE) {

		cnb20le_res(bus, slot, 0);

		cnb20le_res(bus, slot, 1);

	}

	return 0;

}



postcore_initcall(broadcom_postcore_init);