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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> | |
95d77884 | 13 | #include <linux/htirq.h> |
8b955b0d EB |
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; | |
43539c38 EB |
27 | /* Update callback used to cope with buggy hardware */ |
28 | ht_irq_update_t *update; | |
8b955b0d EB |
29 | unsigned pos; |
30 | unsigned idx; | |
ec68307c | 31 | struct ht_irq_msg msg; |
8b955b0d EB |
32 | }; |
33 | ||
8b955b0d | 34 | |
ec68307c | 35 | void write_ht_irq_msg(unsigned int irq, struct ht_irq_msg *msg) |
8b955b0d EB |
36 | { |
37 | struct ht_irq_cfg *cfg = get_irq_data(irq); | |
38 | unsigned long flags; | |
8b955b0d | 39 | spin_lock_irqsave(&ht_irq_lock, flags); |
ec68307c EB |
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 | } | |
43539c38 EB |
48 | if (cfg->update) |
49 | cfg->update(cfg->dev, irq, msg); | |
8b955b0d | 50 | spin_unlock_irqrestore(&ht_irq_lock, flags); |
ec68307c | 51 | cfg->msg = *msg; |
8b955b0d EB |
52 | } |
53 | ||
ec68307c | 54 | void fetch_ht_irq_msg(unsigned int irq, struct ht_irq_msg *msg) |
8b955b0d EB |
55 | { |
56 | struct ht_irq_cfg *cfg = get_irq_data(irq); | |
ec68307c | 57 | *msg = cfg->msg; |
8b955b0d EB |
58 | } |
59 | ||
e9f7ac66 | 60 | void mask_ht_irq(struct irq_data *data) |
8b955b0d | 61 | { |
e9f7ac66 TG |
62 | struct ht_irq_cfg *cfg = irq_data_get_irq_data(data); |
63 | struct ht_irq_msg msg = cfg->msg; | |
8b955b0d | 64 | |
ec68307c | 65 | msg.address_lo |= 1; |
e9f7ac66 | 66 | write_ht_irq_msg(data->irq, &msg); |
8b955b0d EB |
67 | } |
68 | ||
e9f7ac66 | 69 | void unmask_ht_irq(struct irq_data *data) |
8b955b0d | 70 | { |
e9f7ac66 TG |
71 | struct ht_irq_cfg *cfg = irq_data_get_irq_data(data); |
72 | struct ht_irq_msg msg = cfg->msg; | |
8b955b0d | 73 | |
ec68307c | 74 | msg.address_lo &= ~1; |
e9f7ac66 | 75 | write_ht_irq_msg(data->irq, &msg); |
8b955b0d EB |
76 | } |
77 | ||
78 | /** | |
43539c38 | 79 | * __ht_create_irq - create an irq and attach it to a device. |
8b955b0d EB |
80 | * @dev: The hypertransport device to find the irq capability on. |
81 | * @idx: Which of the possible irqs to attach to. | |
43539c38 | 82 | * @update: Function to be called when changing the htirq message |
8b955b0d EB |
83 | * |
84 | * The irq number of the new irq or a negative error value is returned. | |
85 | */ | |
43539c38 | 86 | int __ht_create_irq(struct pci_dev *dev, int idx, ht_irq_update_t *update) |
8b955b0d EB |
87 | { |
88 | struct ht_irq_cfg *cfg; | |
89 | unsigned long flags; | |
90 | u32 data; | |
91 | int max_irq; | |
92 | int pos; | |
1f3addcf | 93 | int irq; |
56b581ea | 94 | int node; |
8b955b0d | 95 | |
120a50df | 96 | pos = pci_find_ht_capability(dev, HT_CAPTYPE_IRQ); |
8b955b0d EB |
97 | if (!pos) |
98 | return -EINVAL; | |
99 | ||
100 | /* Verify the idx I want to use is in range */ | |
101 | spin_lock_irqsave(&ht_irq_lock, flags); | |
102 | pci_write_config_byte(dev, pos + 2, 1); | |
103 | pci_read_config_dword(dev, pos + 4, &data); | |
104 | spin_unlock_irqrestore(&ht_irq_lock, flags); | |
105 | ||
106 | max_irq = (data >> 16) & 0xff; | |
107 | if ( idx > max_irq) | |
108 | return -EINVAL; | |
109 | ||
110 | cfg = kmalloc(sizeof(*cfg), GFP_KERNEL); | |
111 | if (!cfg) | |
112 | return -ENOMEM; | |
113 | ||
114 | cfg->dev = dev; | |
43539c38 | 115 | cfg->update = update; |
8b955b0d EB |
116 | cfg->pos = pos; |
117 | cfg->idx = 0x10 + (idx * 2); | |
ec68307c EB |
118 | /* Initialize msg to a value that will never match the first write. */ |
119 | cfg->msg.address_lo = 0xffffffff; | |
120 | cfg->msg.address_hi = 0xffffffff; | |
8b955b0d | 121 | |
56b581ea YL |
122 | node = dev_to_node(&dev->dev); |
123 | irq = create_irq_nr(0, node); | |
2cc21ef8 | 124 | |
e65ef88c | 125 | if (irq <= 0) { |
8b955b0d EB |
126 | kfree(cfg); |
127 | return -EBUSY; | |
128 | } | |
129 | set_irq_data(irq, cfg); | |
130 | ||
131 | if (arch_setup_ht_irq(irq, dev) < 0) { | |
132 | ht_destroy_irq(irq); | |
133 | return -EBUSY; | |
134 | } | |
135 | ||
136 | return irq; | |
137 | } | |
138 | ||
43539c38 EB |
139 | /** |
140 | * ht_create_irq - create an irq and attach it to a device. | |
141 | * @dev: The hypertransport device to find the irq capability on. | |
142 | * @idx: Which of the possible irqs to attach to. | |
143 | * | |
144 | * ht_create_irq needs to be called for all hypertransport devices | |
145 | * that generate irqs. | |
146 | * | |
147 | * The irq number of the new irq or a negative error value is returned. | |
148 | */ | |
149 | int ht_create_irq(struct pci_dev *dev, int idx) | |
150 | { | |
151 | return __ht_create_irq(dev, idx, NULL); | |
152 | } | |
153 | ||
8b955b0d EB |
154 | /** |
155 | * ht_destroy_irq - destroy an irq created with ht_create_irq | |
cffb2faf | 156 | * @irq: irq to be destroyed |
8b955b0d EB |
157 | * |
158 | * This reverses ht_create_irq removing the specified irq from | |
159 | * existence. The irq should be free before this happens. | |
160 | */ | |
161 | void ht_destroy_irq(unsigned int irq) | |
162 | { | |
163 | struct ht_irq_cfg *cfg; | |
164 | ||
165 | cfg = get_irq_data(irq); | |
166 | set_irq_chip(irq, NULL); | |
167 | set_irq_data(irq, NULL); | |
168 | destroy_irq(irq); | |
169 | ||
170 | kfree(cfg); | |
171 | } | |
172 | ||
43539c38 | 173 | EXPORT_SYMBOL(__ht_create_irq); |
8b955b0d EB |
174 | EXPORT_SYMBOL(ht_create_irq); |
175 | EXPORT_SYMBOL(ht_destroy_irq); |