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/*
* vSMPowered(tm) systems specific initialization
* Copyright (C) 2005 ScaleMP Inc.
*
* Use of this code is subject to the terms and conditions of the
* GNU general public license version 2. See "COPYING" or
* http://www.gnu.org/licenses/gpl.html
*
* Ravikiran Thirumalai <kiran@scalemp.com>,
* Shai Fultheim <shai@scalemp.com>
*/
#include <linux/init.h>
#include <linux/pci_ids.h>
#include <linux/pci_regs.h>
#include <asm/pci-direct.h>
#include <asm/io.h>
void __init vsmp_init(void)
{
void *address;
unsigned int cap, ctl, cfg;
if (!early_pci_allowed())
return;
/* Check if we are running on a ScaleMP vSMP box */
if ((read_pci_config_16(0, 0x1f, 0, PCI_VENDOR_ID) !=
PCI_VENDOR_ID_SCALEMP) ||
(read_pci_config_16(0, 0x1f, 0, PCI_DEVICE_ID) !=
PCI_DEVICE_ID_SCALEMP_VSMP_CTL))
return;
/* set vSMP magic bits to indicate vSMP capable kernel */
cfg = read_pci_config(0, 0x1f, 0, PCI_BASE_ADDRESS_0);
address = early_ioremap(cfg, 8);
cap = readl(address);
ctl = readl(address + 4);
printk(KERN_INFO "vSMP CTL: capabilities:0x%08x control:0x%08x\n",
cap, ctl);
if (cap & ctl & (1 << 4)) {
/* Turn on vSMP IRQ fastpath handling (see system.h) */
ctl &= ~(1 << 4);
writel(ctl, address + 4);
ctl = readl(address + 4);
printk(KERN_INFO "vSMP CTL: control set to:0x%08x\n", ctl);
}
early_iounmap(address, 8);
return;
}
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