Commit | Line | Data |
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79f12614 RT |
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> | |
96597fd2 GC |
11 | * Paravirt ops integration: Glauber de Oliveira Costa <gcosta@redhat.com>, |
12 | * Ravikiran Thirumalai <kiran@scalemp.com> | |
79f12614 RT |
13 | */ |
14 | ||
15 | #include <linux/init.h> | |
16 | #include <linux/pci_ids.h> | |
17 | #include <linux/pci_regs.h> | |
18 | #include <asm/pci-direct.h> | |
734c4c67 | 19 | #include <asm/io.h> |
96597fd2 GC |
20 | #include <asm/paravirt.h> |
21 | ||
aa7d8e25 | 22 | #if defined CONFIG_PCI && defined CONFIG_PARAVIRT |
96597fd2 GC |
23 | /* |
24 | * Interrupt control on vSMPowered systems: | |
25 | * ~AC is a shadow of IF. If IF is 'on' AC should be 'off' | |
26 | * and vice versa. | |
27 | */ | |
28 | ||
29 | static unsigned long vsmp_save_fl(void) | |
30 | { | |
31 | unsigned long flags = native_save_fl(); | |
32 | ||
33 | if (!(flags & X86_EFLAGS_IF) || (flags & X86_EFLAGS_AC)) | |
34 | flags &= ~X86_EFLAGS_IF; | |
35 | return flags; | |
36 | } | |
37 | ||
38 | static void vsmp_restore_fl(unsigned long flags) | |
39 | { | |
40 | if (flags & X86_EFLAGS_IF) | |
41 | flags &= ~X86_EFLAGS_AC; | |
42 | else | |
43 | flags |= X86_EFLAGS_AC; | |
44 | native_restore_fl(flags); | |
45 | } | |
46 | ||
47 | static void vsmp_irq_disable(void) | |
48 | { | |
49 | unsigned long flags = native_save_fl(); | |
50 | ||
51 | native_restore_fl((flags & ~X86_EFLAGS_IF) | X86_EFLAGS_AC); | |
52 | } | |
53 | ||
54 | static void vsmp_irq_enable(void) | |
55 | { | |
56 | unsigned long flags = native_save_fl(); | |
57 | ||
58 | native_restore_fl((flags | X86_EFLAGS_IF) & (~X86_EFLAGS_AC)); | |
59 | } | |
60 | ||
61 | static unsigned __init vsmp_patch(u8 type, u16 clobbers, void *ibuf, | |
62 | unsigned long addr, unsigned len) | |
63 | { | |
64 | switch (type) { | |
65 | case PARAVIRT_PATCH(pv_irq_ops.irq_enable): | |
66 | case PARAVIRT_PATCH(pv_irq_ops.irq_disable): | |
67 | case PARAVIRT_PATCH(pv_irq_ops.save_fl): | |
68 | case PARAVIRT_PATCH(pv_irq_ops.restore_fl): | |
69 | return paravirt_patch_default(type, clobbers, ibuf, addr, len); | |
70 | default: | |
71 | return native_patch(type, clobbers, ibuf, addr, len); | |
72 | } | |
73 | ||
74 | } | |
79f12614 | 75 | |
aa7d8e25 | 76 | static void __init set_vsmp_pv_ops(void) |
79f12614 RT |
77 | { |
78 | void *address; | |
2785c8d0 | 79 | unsigned int cap, ctl, cfg; |
79f12614 | 80 | |
79f12614 | 81 | /* set vSMP magic bits to indicate vSMP capable kernel */ |
2785c8d0 GC |
82 | cfg = read_pci_config(0, 0x1f, 0, PCI_BASE_ADDRESS_0); |
83 | address = early_ioremap(cfg, 8); | |
79f12614 RT |
84 | cap = readl(address); |
85 | ctl = readl(address + 4); | |
ed4aed98 TG |
86 | printk(KERN_INFO "vSMP CTL: capabilities:0x%08x control:0x%08x\n", |
87 | cap, ctl); | |
79f12614 | 88 | if (cap & ctl & (1 << 4)) { |
9f6d8552 RT |
89 | /* Setup irq ops and turn on vSMP IRQ fastpath handling */ |
90 | pv_irq_ops.irq_disable = vsmp_irq_disable; | |
91 | pv_irq_ops.irq_enable = vsmp_irq_enable; | |
92 | pv_irq_ops.save_fl = vsmp_save_fl; | |
93 | pv_irq_ops.restore_fl = vsmp_restore_fl; | |
94 | pv_init_ops.patch = vsmp_patch; | |
95 | ||
79f12614 RT |
96 | ctl &= ~(1 << 4); |
97 | writel(ctl, address + 4); | |
98 | ctl = readl(address + 4); | |
ed4aed98 | 99 | printk(KERN_INFO "vSMP CTL: control set to:0x%08x\n", ctl); |
79f12614 RT |
100 | } |
101 | ||
2785c8d0 | 102 | early_iounmap(address, 8); |
aa7d8e25 RT |
103 | } |
104 | #else | |
105 | static void __init set_vsmp_pv_ops(void) | |
106 | { | |
107 | } | |
108 | #endif | |
109 | ||
110 | #ifdef CONFIG_PCI | |
e5699a82 | 111 | static int is_vsmp = -1; |
aa7d8e25 | 112 | |
e5699a82 | 113 | static void __init detect_vsmp_box(void) |
aa7d8e25 | 114 | { |
e5699a82 | 115 | is_vsmp = 0; |
aa7d8e25 | 116 | |
aa7d8e25 | 117 | if (!early_pci_allowed()) |
e5699a82 | 118 | return; |
aa7d8e25 | 119 | |
e5699a82 | 120 | /* Check if we are running on a ScaleMP vSMPowered box */ |
6542fe80 IM |
121 | if (read_pci_config(0, 0x1f, 0, PCI_VENDOR_ID) == |
122 | (PCI_VENDOR_ID_SCALEMP | (PCI_DEVICE_ID_SCALEMP_VSMP_CTL << 16))) | |
e5699a82 RT |
123 | is_vsmp = 1; |
124 | } | |
aa7d8e25 | 125 | |
e5699a82 RT |
126 | int is_vsmp_box(void) |
127 | { | |
128 | if (is_vsmp != -1) | |
129 | return is_vsmp; | |
130 | else { | |
131 | WARN_ON_ONCE(1); | |
132 | return 0; | |
133 | } | |
aa7d8e25 RT |
134 | } |
135 | #else | |
8008abbd | 136 | static void __init detect_vsmp_box(void) |
e5699a82 RT |
137 | { |
138 | } | |
aa7d8e25 RT |
139 | int is_vsmp_box(void) |
140 | { | |
141 | return 0; | |
142 | } | |
143 | #endif | |
144 | ||
145 | void __init vsmp_init(void) | |
146 | { | |
e5699a82 | 147 | detect_vsmp_box(); |
aa7d8e25 RT |
148 | if (!is_vsmp_box()) |
149 | return; | |
150 | ||
151 | set_vsmp_pv_ops(); | |
a2beab31 | 152 | return; |
79f12614 | 153 | } |