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8b955b0d EB |
1 | /* |
2 | * File: htirq.c | |
3 | * Purpose: Hypertransport Interrupt Capability | |
4 | * | |
5 | * Copyright (C) 2006 Linux Networx | |
6 | * Copyright (C) Eric Biederman <ebiederman@lnxi.com> | |
7 | */ | |
8 | ||
9 | #include <linux/irq.h> | |
10 | #include <linux/pci.h> | |
11 | #include <linux/spinlock.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/gfp.h> | |
14 | ||
15 | /* Global ht irq lock. | |
16 | * | |
17 | * This is needed to serialize access to the data port in hypertransport | |
18 | * irq capability. | |
19 | * | |
20 | * With multiple simultaneous hypertransport irq devices it might pay | |
21 | * to make this more fine grained. But start with simple, stupid, and correct. | |
22 | */ | |
23 | static DEFINE_SPINLOCK(ht_irq_lock); | |
24 | ||
25 | struct ht_irq_cfg { | |
26 | struct pci_dev *dev; | |
27 | unsigned pos; | |
28 | unsigned idx; | |
29 | }; | |
30 | ||
31 | void write_ht_irq_low(unsigned int irq, u32 data) | |
32 | { | |
33 | struct ht_irq_cfg *cfg = get_irq_data(irq); | |
34 | unsigned long flags; | |
35 | spin_lock_irqsave(&ht_irq_lock, flags); | |
36 | pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx); | |
37 | pci_write_config_dword(cfg->dev, cfg->pos + 4, data); | |
38 | spin_unlock_irqrestore(&ht_irq_lock, flags); | |
39 | } | |
40 | ||
41 | void write_ht_irq_high(unsigned int irq, u32 data) | |
42 | { | |
43 | struct ht_irq_cfg *cfg = get_irq_data(irq); | |
44 | unsigned long flags; | |
45 | spin_lock_irqsave(&ht_irq_lock, flags); | |
46 | pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx + 1); | |
47 | pci_write_config_dword(cfg->dev, cfg->pos + 4, data); | |
48 | spin_unlock_irqrestore(&ht_irq_lock, flags); | |
49 | } | |
50 | ||
51 | u32 read_ht_irq_low(unsigned int irq) | |
52 | { | |
53 | struct ht_irq_cfg *cfg = get_irq_data(irq); | |
54 | unsigned long flags; | |
55 | u32 data; | |
56 | spin_lock_irqsave(&ht_irq_lock, flags); | |
57 | pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx); | |
58 | pci_read_config_dword(cfg->dev, cfg->pos + 4, &data); | |
59 | spin_unlock_irqrestore(&ht_irq_lock, flags); | |
60 | return data; | |
61 | } | |
62 | ||
63 | u32 read_ht_irq_high(unsigned int irq) | |
64 | { | |
65 | struct ht_irq_cfg *cfg = get_irq_data(irq); | |
66 | unsigned long flags; | |
67 | u32 data; | |
68 | spin_lock_irqsave(&ht_irq_lock, flags); | |
69 | pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx + 1); | |
70 | pci_read_config_dword(cfg->dev, cfg->pos + 4, &data); | |
71 | spin_unlock_irqrestore(&ht_irq_lock, flags); | |
72 | return data; | |
73 | } | |
74 | ||
75 | void mask_ht_irq(unsigned int irq) | |
76 | { | |
77 | struct ht_irq_cfg *cfg; | |
78 | unsigned long flags; | |
79 | u32 data; | |
80 | ||
81 | cfg = get_irq_data(irq); | |
82 | ||
83 | spin_lock_irqsave(&ht_irq_lock, flags); | |
84 | pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx); | |
85 | pci_read_config_dword(cfg->dev, cfg->pos + 4, &data); | |
86 | data |= 1; | |
87 | pci_write_config_dword(cfg->dev, cfg->pos + 4, data); | |
88 | spin_unlock_irqrestore(&ht_irq_lock, flags); | |
89 | } | |
90 | ||
91 | void unmask_ht_irq(unsigned int irq) | |
92 | { | |
93 | struct ht_irq_cfg *cfg; | |
94 | unsigned long flags; | |
95 | u32 data; | |
96 | ||
97 | cfg = get_irq_data(irq); | |
98 | ||
99 | spin_lock_irqsave(&ht_irq_lock, flags); | |
100 | pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx); | |
101 | pci_read_config_dword(cfg->dev, cfg->pos + 4, &data); | |
102 | data &= ~1; | |
103 | pci_write_config_dword(cfg->dev, cfg->pos + 4, data); | |
104 | spin_unlock_irqrestore(&ht_irq_lock, flags); | |
105 | } | |
106 | ||
107 | /** | |
108 | * ht_create_irq - create an irq and attach it to a device. | |
109 | * @dev: The hypertransport device to find the irq capability on. | |
110 | * @idx: Which of the possible irqs to attach to. | |
111 | * | |
112 | * ht_create_irq is needs to be called for all hypertransport devices | |
113 | * that generate irqs. | |
114 | * | |
115 | * The irq number of the new irq or a negative error value is returned. | |
116 | */ | |
117 | int ht_create_irq(struct pci_dev *dev, int idx) | |
118 | { | |
119 | struct ht_irq_cfg *cfg; | |
120 | unsigned long flags; | |
121 | u32 data; | |
122 | int max_irq; | |
123 | int pos; | |
124 | int irq; | |
125 | ||
126 | pos = pci_find_capability(dev, PCI_CAP_ID_HT); | |
127 | while (pos) { | |
128 | u8 subtype; | |
129 | pci_read_config_byte(dev, pos + 3, &subtype); | |
130 | if (subtype == HT_CAPTYPE_IRQ) | |
131 | break; | |
132 | pos = pci_find_next_capability(dev, pos, PCI_CAP_ID_HT); | |
133 | } | |
134 | if (!pos) | |
135 | return -EINVAL; | |
136 | ||
137 | /* Verify the idx I want to use is in range */ | |
138 | spin_lock_irqsave(&ht_irq_lock, flags); | |
139 | pci_write_config_byte(dev, pos + 2, 1); | |
140 | pci_read_config_dword(dev, pos + 4, &data); | |
141 | spin_unlock_irqrestore(&ht_irq_lock, flags); | |
142 | ||
143 | max_irq = (data >> 16) & 0xff; | |
144 | if ( idx > max_irq) | |
145 | return -EINVAL; | |
146 | ||
147 | cfg = kmalloc(sizeof(*cfg), GFP_KERNEL); | |
148 | if (!cfg) | |
149 | return -ENOMEM; | |
150 | ||
151 | cfg->dev = dev; | |
152 | cfg->pos = pos; | |
153 | cfg->idx = 0x10 + (idx * 2); | |
154 | ||
155 | irq = create_irq(); | |
156 | if (irq < 0) { | |
157 | kfree(cfg); | |
158 | return -EBUSY; | |
159 | } | |
160 | set_irq_data(irq, cfg); | |
161 | ||
162 | if (arch_setup_ht_irq(irq, dev) < 0) { | |
163 | ht_destroy_irq(irq); | |
164 | return -EBUSY; | |
165 | } | |
166 | ||
167 | return irq; | |
168 | } | |
169 | ||
170 | /** | |
171 | * ht_destroy_irq - destroy an irq created with ht_create_irq | |
172 | * | |
173 | * This reverses ht_create_irq removing the specified irq from | |
174 | * existence. The irq should be free before this happens. | |
175 | */ | |
176 | void ht_destroy_irq(unsigned int irq) | |
177 | { | |
178 | struct ht_irq_cfg *cfg; | |
179 | ||
180 | cfg = get_irq_data(irq); | |
181 | set_irq_chip(irq, NULL); | |
182 | set_irq_data(irq, NULL); | |
183 | destroy_irq(irq); | |
184 | ||
185 | kfree(cfg); | |
186 | } | |
187 | ||
188 | EXPORT_SYMBOL(ht_create_irq); | |
189 | EXPORT_SYMBOL(ht_destroy_irq); |