3 * Purpose: Hypertransport Interrupt Capability
5 * Copyright (C) 2006 Linux Networx
6 * Copyright (C) Eric Biederman <ebiederman@lnxi.com>
10 #include <linux/pci.h>
11 #include <linux/spinlock.h>
12 #include <linux/export.h>
13 #include <linux/slab.h>
14 #include <linux/htirq.h>
16 /* Global ht irq lock.
18 * This is needed to serialize access to the data port in hypertransport
21 * With multiple simultaneous hypertransport irq devices it might pay
22 * to make this more fine grained. But start with simple, stupid, and correct.
24 static DEFINE_SPINLOCK(ht_irq_lock
);
28 /* Update callback used to cope with buggy hardware */
29 ht_irq_update_t
*update
;
32 struct ht_irq_msg msg
;
36 void write_ht_irq_msg(unsigned int irq
, struct ht_irq_msg
*msg
)
38 struct ht_irq_cfg
*cfg
= irq_get_handler_data(irq
);
40 spin_lock_irqsave(&ht_irq_lock
, flags
);
41 if (cfg
->msg
.address_lo
!= msg
->address_lo
) {
42 pci_write_config_byte(cfg
->dev
, cfg
->pos
+ 2, cfg
->idx
);
43 pci_write_config_dword(cfg
->dev
, cfg
->pos
+ 4, msg
->address_lo
);
45 if (cfg
->msg
.address_hi
!= msg
->address_hi
) {
46 pci_write_config_byte(cfg
->dev
, cfg
->pos
+ 2, cfg
->idx
+ 1);
47 pci_write_config_dword(cfg
->dev
, cfg
->pos
+ 4, msg
->address_hi
);
50 cfg
->update(cfg
->dev
, irq
, msg
);
51 spin_unlock_irqrestore(&ht_irq_lock
, flags
);
55 void fetch_ht_irq_msg(unsigned int irq
, struct ht_irq_msg
*msg
)
57 struct ht_irq_cfg
*cfg
= irq_get_handler_data(irq
);
61 void mask_ht_irq(struct irq_data
*data
)
63 struct ht_irq_cfg
*cfg
= irq_data_get_irq_handler_data(data
);
64 struct ht_irq_msg msg
= cfg
->msg
;
67 write_ht_irq_msg(data
->irq
, &msg
);
70 void unmask_ht_irq(struct irq_data
*data
)
72 struct ht_irq_cfg
*cfg
= irq_data_get_irq_handler_data(data
);
73 struct ht_irq_msg msg
= cfg
->msg
;
76 write_ht_irq_msg(data
->irq
, &msg
);
80 * __ht_create_irq - create an irq and attach it to a device.
81 * @dev: The hypertransport device to find the irq capability on.
82 * @idx: Which of the possible irqs to attach to.
83 * @update: Function to be called when changing the htirq message
85 * The irq number of the new irq or a negative error value is returned.
87 int __ht_create_irq(struct pci_dev
*dev
, int idx
, ht_irq_update_t
*update
)
89 struct ht_irq_cfg
*cfg
;
97 pos
= pci_find_ht_capability(dev
, HT_CAPTYPE_IRQ
);
101 /* Verify the idx I want to use is in range */
102 spin_lock_irqsave(&ht_irq_lock
, flags
);
103 pci_write_config_byte(dev
, pos
+ 2, 1);
104 pci_read_config_dword(dev
, pos
+ 4, &data
);
105 spin_unlock_irqrestore(&ht_irq_lock
, flags
);
107 max_irq
= (data
>> 16) & 0xff;
111 cfg
= kmalloc(sizeof(*cfg
), GFP_KERNEL
);
116 cfg
->update
= update
;
118 cfg
->idx
= 0x10 + (idx
* 2);
119 /* Initialize msg to a value that will never match the first write. */
120 cfg
->msg
.address_lo
= 0xffffffff;
121 cfg
->msg
.address_hi
= 0xffffffff;
123 node
= dev_to_node(&dev
->dev
);
124 irq
= create_irq_nr(0, node
);
130 irq_set_handler_data(irq
, cfg
);
132 if (arch_setup_ht_irq(irq
, dev
) < 0) {
141 * ht_create_irq - create an irq and attach it to a device.
142 * @dev: The hypertransport device to find the irq capability on.
143 * @idx: Which of the possible irqs to attach to.
145 * ht_create_irq needs to be called for all hypertransport devices
146 * that generate irqs.
148 * The irq number of the new irq or a negative error value is returned.
150 int ht_create_irq(struct pci_dev
*dev
, int idx
)
152 return __ht_create_irq(dev
, idx
, NULL
);
156 * ht_destroy_irq - destroy an irq created with ht_create_irq
157 * @irq: irq to be destroyed
159 * This reverses ht_create_irq removing the specified irq from
160 * existence. The irq should be free before this happens.
162 void ht_destroy_irq(unsigned int irq
)
164 struct ht_irq_cfg
*cfg
;
166 cfg
= irq_get_handler_data(irq
);
167 irq_set_chip(irq
, NULL
);
168 irq_set_handler_data(irq
, NULL
);
174 EXPORT_SYMBOL(__ht_create_irq
);
175 EXPORT_SYMBOL(ht_create_irq
);
176 EXPORT_SYMBOL(ht_destroy_irq
);
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