fdf9fba6ba9c1a4455805c4501d9bce5d4746217
[sfrench/cifs-2.6.git] / arch / x86 / kernel / vsmp_64.c
1 /*
2  * vSMPowered(tm) systems specific initialization
3  * Copyright (C) 2005 ScaleMP Inc.
4  *
5  * Use of this code is subject to the terms and conditions of the
6  * GNU general public license version 2. See "COPYING" or
7  * http://www.gnu.org/licenses/gpl.html
8  *
9  * Ravikiran Thirumalai <kiran@scalemp.com>,
10  * Shai Fultheim <shai@scalemp.com>
11  */
12
13 #include <linux/init.h>
14 #include <linux/pci_ids.h>
15 #include <linux/pci_regs.h>
16 #include <asm/pci-direct.h>
17 #include <asm/io.h>
18
19 void __init vsmp_init(void)
20 {
21         void *address;
22         unsigned int cap, ctl, cfg;
23
24         if (!early_pci_allowed())
25                 return;
26
27         /* Check if we are running on a ScaleMP vSMP box */
28         if ((read_pci_config_16(0, 0x1f, 0, PCI_VENDOR_ID) !=
29              PCI_VENDOR_ID_SCALEMP) ||
30             (read_pci_config_16(0, 0x1f, 0, PCI_DEVICE_ID) !=
31              PCI_DEVICE_ID_SCALEMP_VSMP_CTL))
32                 return;
33
34         /* set vSMP magic bits to indicate vSMP capable kernel */
35         cfg = read_pci_config(0, 0x1f, 0, PCI_BASE_ADDRESS_0);
36         address = early_ioremap(cfg, 8);
37         cap = readl(address);
38         ctl = readl(address + 4);
39         printk(KERN_INFO "vSMP CTL: capabilities:0x%08x  control:0x%08x\n",
40                cap, ctl);
41         if (cap & ctl & (1 << 4)) {
42                 /* Turn on vSMP IRQ fastpath handling (see system.h) */
43                 ctl &= ~(1 << 4);
44                 writel(ctl, address + 4);
45                 ctl = readl(address + 4);
46                 printk(KERN_INFO "vSMP CTL: control set to:0x%08x\n", ctl);
47         }
48
49         early_iounmap(address, 8);
50         return;
51 }