blob: 7eb4109a3df4eb6941f6c4c8ee435e7bb98f7747 [file] [log] [blame]
Eric W. Biederman8b955b02006-10-04 02:16:55 -07001/*
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>
Paul Gortmaker363c75d2011-05-27 09:37:25 -040012#include <linux/export.h>
Eric W. Biederman8b955b02006-10-04 02:16:55 -070013#include <linux/slab.h>
Eric W. Biederman95d77882006-10-04 02:17:01 -070014#include <linux/htirq.h>
Eric W. Biederman8b955b02006-10-04 02:16:55 -070015
16/* Global ht irq lock.
17 *
18 * This is needed to serialize access to the data port in hypertransport
19 * irq capability.
20 *
21 * With multiple simultaneous hypertransport irq devices it might pay
22 * to make this more fine grained. But start with simple, stupid, and correct.
23 */
24static DEFINE_SPINLOCK(ht_irq_lock);
25
Eric W. Biedermanec683072006-11-08 17:44:57 -080026void write_ht_irq_msg(unsigned int irq, struct ht_irq_msg *msg)
Eric W. Biederman8b955b02006-10-04 02:16:55 -070027{
Thomas Gleixnerdced35a2011-03-28 17:49:12 +020028 struct ht_irq_cfg *cfg = irq_get_handler_data(irq);
Eric W. Biederman8b955b02006-10-04 02:16:55 -070029 unsigned long flags;
Jiang Liu49e07d82015-04-13 14:11:43 +080030
Eric W. Biederman8b955b02006-10-04 02:16:55 -070031 spin_lock_irqsave(&ht_irq_lock, flags);
Eric W. Biedermanec683072006-11-08 17:44:57 -080032 if (cfg->msg.address_lo != msg->address_lo) {
33 pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx);
34 pci_write_config_dword(cfg->dev, cfg->pos + 4, msg->address_lo);
35 }
36 if (cfg->msg.address_hi != msg->address_hi) {
37 pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx + 1);
38 pci_write_config_dword(cfg->dev, cfg->pos + 4, msg->address_hi);
39 }
Eric W. Biederman43539c382006-11-08 17:44:57 -080040 if (cfg->update)
41 cfg->update(cfg->dev, irq, msg);
Eric W. Biederman8b955b02006-10-04 02:16:55 -070042 spin_unlock_irqrestore(&ht_irq_lock, flags);
Eric W. Biedermanec683072006-11-08 17:44:57 -080043 cfg->msg = *msg;
Eric W. Biederman8b955b02006-10-04 02:16:55 -070044}
45
Eric W. Biedermanec683072006-11-08 17:44:57 -080046void fetch_ht_irq_msg(unsigned int irq, struct ht_irq_msg *msg)
Eric W. Biederman8b955b02006-10-04 02:16:55 -070047{
Thomas Gleixnerdced35a2011-03-28 17:49:12 +020048 struct ht_irq_cfg *cfg = irq_get_handler_data(irq);
Jiang Liu49e07d82015-04-13 14:11:43 +080049
Eric W. Biedermanec683072006-11-08 17:44:57 -080050 *msg = cfg->msg;
Eric W. Biederman8b955b02006-10-04 02:16:55 -070051}
52
Thomas Gleixnere9f7ac62010-09-28 17:22:09 +020053void mask_ht_irq(struct irq_data *data)
Eric W. Biederman8b955b02006-10-04 02:16:55 -070054{
Thomas Gleixnerdced35a2011-03-28 17:49:12 +020055 struct ht_irq_cfg *cfg = irq_data_get_irq_handler_data(data);
Thomas Gleixnere9f7ac62010-09-28 17:22:09 +020056 struct ht_irq_msg msg = cfg->msg;
Eric W. Biederman8b955b02006-10-04 02:16:55 -070057
Eric W. Biedermanec683072006-11-08 17:44:57 -080058 msg.address_lo |= 1;
Thomas Gleixnere9f7ac62010-09-28 17:22:09 +020059 write_ht_irq_msg(data->irq, &msg);
Eric W. Biederman8b955b02006-10-04 02:16:55 -070060}
61
Thomas Gleixnere9f7ac62010-09-28 17:22:09 +020062void unmask_ht_irq(struct irq_data *data)
Eric W. Biederman8b955b02006-10-04 02:16:55 -070063{
Thomas Gleixnerdced35a2011-03-28 17:49:12 +020064 struct ht_irq_cfg *cfg = irq_data_get_irq_handler_data(data);
Thomas Gleixnere9f7ac62010-09-28 17:22:09 +020065 struct ht_irq_msg msg = cfg->msg;
Eric W. Biederman8b955b02006-10-04 02:16:55 -070066
Eric W. Biedermanec683072006-11-08 17:44:57 -080067 msg.address_lo &= ~1;
Thomas Gleixnere9f7ac62010-09-28 17:22:09 +020068 write_ht_irq_msg(data->irq, &msg);
Eric W. Biederman8b955b02006-10-04 02:16:55 -070069}
70
71/**
Eric W. Biederman43539c382006-11-08 17:44:57 -080072 * __ht_create_irq - create an irq and attach it to a device.
Eric W. Biederman8b955b02006-10-04 02:16:55 -070073 * @dev: The hypertransport device to find the irq capability on.
74 * @idx: Which of the possible irqs to attach to.
Eric W. Biederman43539c382006-11-08 17:44:57 -080075 * @update: Function to be called when changing the htirq message
Eric W. Biederman8b955b02006-10-04 02:16:55 -070076 *
77 * The irq number of the new irq or a negative error value is returned.
78 */
Eric W. Biederman43539c382006-11-08 17:44:57 -080079int __ht_create_irq(struct pci_dev *dev, int idx, ht_irq_update_t *update)
Eric W. Biederman8b955b02006-10-04 02:16:55 -070080{
Thomas Gleixner59b47dd2014-05-07 15:44:08 +000081 int max_irq, pos, irq;
Eric W. Biederman8b955b02006-10-04 02:16:55 -070082 unsigned long flags;
83 u32 data;
Eric W. Biederman8b955b02006-10-04 02:16:55 -070084
Michael Ellerman120a50d2006-11-22 18:26:19 +110085 pos = pci_find_ht_capability(dev, HT_CAPTYPE_IRQ);
Eric W. Biederman8b955b02006-10-04 02:16:55 -070086 if (!pos)
87 return -EINVAL;
88
89 /* Verify the idx I want to use is in range */
90 spin_lock_irqsave(&ht_irq_lock, flags);
91 pci_write_config_byte(dev, pos + 2, 1);
92 pci_read_config_dword(dev, pos + 4, &data);
93 spin_unlock_irqrestore(&ht_irq_lock, flags);
94
95 max_irq = (data >> 16) & 0xff;
Ryan Desfosses3c78bc62014-04-18 20:13:49 -040096 if (idx > max_irq)
Eric W. Biederman8b955b02006-10-04 02:16:55 -070097 return -EINVAL;
98
Jiang Liu49e07d82015-04-13 14:11:43 +080099 irq = arch_setup_ht_irq(idx, pos, dev, update);
100 if (irq > 0)
101 dev_dbg(&dev->dev, "irq %d for HT\n", irq);
Eric W. Biederman8b955b02006-10-04 02:16:55 -0700102
103 return irq;
104}
Ryan Desfossesb7fe9432014-04-25 14:32:25 -0600105EXPORT_SYMBOL(__ht_create_irq);
Eric W. Biederman8b955b02006-10-04 02:16:55 -0700106
107/**
Eric W. Biederman43539c382006-11-08 17:44:57 -0800108 * 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 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 */
117int ht_create_irq(struct pci_dev *dev, int idx)
118{
119 return __ht_create_irq(dev, idx, NULL);
120}
Ryan Desfossesb7fe9432014-04-25 14:32:25 -0600121EXPORT_SYMBOL(ht_create_irq);
Eric W. Biederman43539c382006-11-08 17:44:57 -0800122
123/**
Eric W. Biederman8b955b02006-10-04 02:16:55 -0700124 * ht_destroy_irq - destroy an irq created with ht_create_irq
Randy Dunlapcffb2fa2009-04-10 15:17:50 -0700125 * @irq: irq to be destroyed
Eric W. Biederman8b955b02006-10-04 02:16:55 -0700126 *
127 * This reverses ht_create_irq removing the specified irq from
128 * existence. The irq should be free before this happens.
129 */
130void ht_destroy_irq(unsigned int irq)
131{
Jiang Liu49e07d82015-04-13 14:11:43 +0800132 arch_teardown_ht_irq(irq);
Eric W. Biederman8b955b02006-10-04 02:16:55 -0700133}
Eric W. Biederman8b955b02006-10-04 02:16:55 -0700134EXPORT_SYMBOL(ht_destroy_irq);