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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/htirq.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 | /* Update callback used to cope with buggy hardware */ |
28 | ht_irq_update_t *update; |
29 | unsigned pos; |
30 | unsigned idx; |
31 | struct ht_irq_msg msg; |
32 | }; |
33 | |
34 | |
35 | void write_ht_irq_msg(unsigned int irq, struct ht_irq_msg *msg) |
36 | { |
37 | struct ht_irq_cfg *cfg = get_irq_data(irq); |
38 | unsigned long flags; |
39 | spin_lock_irqsave(&ht_irq_lock, flags); |
40 | if (cfg->msg.address_lo != msg->address_lo) { |
41 | pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx); |
42 | pci_write_config_dword(cfg->dev, cfg->pos + 4, msg->address_lo); |
43 | } |
44 | if (cfg->msg.address_hi != msg->address_hi) { |
45 | pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx + 1); |
46 | pci_write_config_dword(cfg->dev, cfg->pos + 4, msg->address_hi); |
47 | } |
48 | if (cfg->update) |
49 | cfg->update(cfg->dev, irq, msg); |
50 | spin_unlock_irqrestore(&ht_irq_lock, flags); |
51 | cfg->msg = *msg; |
52 | } |
53 | |
54 | void fetch_ht_irq_msg(unsigned int irq, struct ht_irq_msg *msg) |
55 | { |
56 | struct ht_irq_cfg *cfg = get_irq_data(irq); |
57 | *msg = cfg->msg; |
58 | } |
59 | |
60 | void mask_ht_irq(unsigned int irq) |
61 | { |
62 | struct ht_irq_cfg *cfg; |
63 | struct ht_irq_msg msg; |
64 | |
65 | cfg = get_irq_data(irq); |
66 | |
67 | msg = cfg->msg; |
68 | msg.address_lo |= 1; |
69 | write_ht_irq_msg(irq, &msg); |
70 | } |
71 | |
72 | void unmask_ht_irq(unsigned int irq) |
73 | { |
74 | struct ht_irq_cfg *cfg; |
75 | struct ht_irq_msg msg; |
76 | |
77 | cfg = get_irq_data(irq); |
78 | |
79 | msg = cfg->msg; |
80 | msg.address_lo &= ~1; |
81 | write_ht_irq_msg(irq, &msg); |
82 | } |
83 | |
84 | /** |
85 | * __ht_create_irq - create an irq and attach it to a device. |
86 | * @dev: The hypertransport device to find the irq capability on. |
87 | * @idx: Which of the possible irqs to attach to. |
88 | * @update: Function to be called when changing the htirq message |
89 | * |
90 | * The irq number of the new irq or a negative error value is returned. |
91 | */ |
92 | int __ht_create_irq(struct pci_dev *dev, int idx, ht_irq_update_t *update) |
93 | { |
94 | struct ht_irq_cfg *cfg; |
95 | unsigned long flags; |
96 | u32 data; |
97 | int max_irq; |
98 | int pos; |
99 | int irq; |
100 | int node; |
101 | |
102 | pos = pci_find_ht_capability(dev, HT_CAPTYPE_IRQ); |
103 | if (!pos) |
104 | return -EINVAL; |
105 | |
106 | /* Verify the idx I want to use is in range */ |
107 | spin_lock_irqsave(&ht_irq_lock, flags); |
108 | pci_write_config_byte(dev, pos + 2, 1); |
109 | pci_read_config_dword(dev, pos + 4, &data); |
110 | spin_unlock_irqrestore(&ht_irq_lock, flags); |
111 | |
112 | max_irq = (data >> 16) & 0xff; |
113 | if ( idx > max_irq) |
114 | return -EINVAL; |
115 | |
116 | cfg = kmalloc(sizeof(*cfg), GFP_KERNEL); |
117 | if (!cfg) |
118 | return -ENOMEM; |
119 | |
120 | cfg->dev = dev; |
121 | cfg->update = update; |
122 | cfg->pos = pos; |
123 | cfg->idx = 0x10 + (idx * 2); |
124 | /* Initialize msg to a value that will never match the first write. */ |
125 | cfg->msg.address_lo = 0xffffffff; |
126 | cfg->msg.address_hi = 0xffffffff; |
127 | |
128 | node = dev_to_node(&dev->dev); |
129 | irq = create_irq_nr(0, node); |
130 | |
131 | if (irq <= 0) { |
132 | kfree(cfg); |
133 | return -EBUSY; |
134 | } |
135 | set_irq_data(irq, cfg); |
136 | |
137 | if (arch_setup_ht_irq(irq, dev) < 0) { |
138 | ht_destroy_irq(irq); |
139 | return -EBUSY; |
140 | } |
141 | |
142 | return irq; |
143 | } |
144 | |
145 | /** |
146 | * ht_create_irq - create an irq and attach it to a device. |
147 | * @dev: The hypertransport device to find the irq capability on. |
148 | * @idx: Which of the possible irqs to attach to. |
149 | * |
150 | * ht_create_irq needs to be called for all hypertransport devices |
151 | * that generate irqs. |
152 | * |
153 | * The irq number of the new irq or a negative error value is returned. |
154 | */ |
155 | int ht_create_irq(struct pci_dev *dev, int idx) |
156 | { |
157 | return __ht_create_irq(dev, idx, NULL); |
158 | } |
159 | |
160 | /** |
161 | * ht_destroy_irq - destroy an irq created with ht_create_irq |
162 | * @irq: irq to be destroyed |
163 | * |
164 | * This reverses ht_create_irq removing the specified irq from |
165 | * existence. The irq should be free before this happens. |
166 | */ |
167 | void ht_destroy_irq(unsigned int irq) |
168 | { |
169 | struct ht_irq_cfg *cfg; |
170 | |
171 | cfg = get_irq_data(irq); |
172 | set_irq_chip(irq, NULL); |
173 | set_irq_data(irq, NULL); |
174 | destroy_irq(irq); |
175 | |
176 | kfree(cfg); |
177 | } |
178 | |
179 | EXPORT_SYMBOL(__ht_create_irq); |
180 | EXPORT_SYMBOL(ht_create_irq); |
181 | EXPORT_SYMBOL(ht_destroy_irq); |
182 |
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