134 lines
3.5 KiB
C
134 lines
3.5 KiB
C
/*
|
|
* File: htirq.c
|
|
* Purpose: Hypertransport Interrupt Capability
|
|
*
|
|
* Copyright (C) 2006 Linux Networx
|
|
* Copyright (C) Eric Biederman <ebiederman@lnxi.com>
|
|
*/
|
|
|
|
#include <linux/irq.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/export.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/htirq.h>
|
|
|
|
/* Global ht irq lock.
|
|
*
|
|
* This is needed to serialize access to the data port in hypertransport
|
|
* irq capability.
|
|
*
|
|
* With multiple simultaneous hypertransport irq devices it might pay
|
|
* to make this more fine grained. But start with simple, stupid, and correct.
|
|
*/
|
|
static DEFINE_SPINLOCK(ht_irq_lock);
|
|
|
|
void write_ht_irq_msg(unsigned int irq, struct ht_irq_msg *msg)
|
|
{
|
|
struct ht_irq_cfg *cfg = irq_get_handler_data(irq);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&ht_irq_lock, flags);
|
|
if (cfg->msg.address_lo != msg->address_lo) {
|
|
pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx);
|
|
pci_write_config_dword(cfg->dev, cfg->pos + 4, msg->address_lo);
|
|
}
|
|
if (cfg->msg.address_hi != msg->address_hi) {
|
|
pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx + 1);
|
|
pci_write_config_dword(cfg->dev, cfg->pos + 4, msg->address_hi);
|
|
}
|
|
if (cfg->update)
|
|
cfg->update(cfg->dev, irq, msg);
|
|
spin_unlock_irqrestore(&ht_irq_lock, flags);
|
|
cfg->msg = *msg;
|
|
}
|
|
|
|
void fetch_ht_irq_msg(unsigned int irq, struct ht_irq_msg *msg)
|
|
{
|
|
struct ht_irq_cfg *cfg = irq_get_handler_data(irq);
|
|
|
|
*msg = cfg->msg;
|
|
}
|
|
|
|
void mask_ht_irq(struct irq_data *data)
|
|
{
|
|
struct ht_irq_cfg *cfg = irq_data_get_irq_handler_data(data);
|
|
struct ht_irq_msg msg = cfg->msg;
|
|
|
|
msg.address_lo |= 1;
|
|
write_ht_irq_msg(data->irq, &msg);
|
|
}
|
|
|
|
void unmask_ht_irq(struct irq_data *data)
|
|
{
|
|
struct ht_irq_cfg *cfg = irq_data_get_irq_handler_data(data);
|
|
struct ht_irq_msg msg = cfg->msg;
|
|
|
|
msg.address_lo &= ~1;
|
|
write_ht_irq_msg(data->irq, &msg);
|
|
}
|
|
|
|
/**
|
|
* __ht_create_irq - create an irq and attach it to a device.
|
|
* @dev: The hypertransport device to find the irq capability on.
|
|
* @idx: Which of the possible irqs to attach to.
|
|
* @update: Function to be called when changing the htirq message
|
|
*
|
|
* The irq number of the new irq or a negative error value is returned.
|
|
*/
|
|
int __ht_create_irq(struct pci_dev *dev, int idx, ht_irq_update_t *update)
|
|
{
|
|
int max_irq, pos, irq;
|
|
unsigned long flags;
|
|
u32 data;
|
|
|
|
pos = pci_find_ht_capability(dev, HT_CAPTYPE_IRQ);
|
|
if (!pos)
|
|
return -EINVAL;
|
|
|
|
/* Verify the idx I want to use is in range */
|
|
spin_lock_irqsave(&ht_irq_lock, flags);
|
|
pci_write_config_byte(dev, pos + 2, 1);
|
|
pci_read_config_dword(dev, pos + 4, &data);
|
|
spin_unlock_irqrestore(&ht_irq_lock, flags);
|
|
|
|
max_irq = (data >> 16) & 0xff;
|
|
if (idx > max_irq)
|
|
return -EINVAL;
|
|
|
|
irq = arch_setup_ht_irq(idx, pos, dev, update);
|
|
if (irq > 0)
|
|
dev_dbg(&dev->dev, "irq %d for HT\n", irq);
|
|
|
|
return irq;
|
|
}
|
|
EXPORT_SYMBOL(__ht_create_irq);
|
|
|
|
/**
|
|
* ht_create_irq - create an irq and attach it to a device.
|
|
* @dev: The hypertransport device to find the irq capability on.
|
|
* @idx: Which of the possible irqs to attach to.
|
|
*
|
|
* ht_create_irq needs to be called for all hypertransport devices
|
|
* that generate irqs.
|
|
*
|
|
* The irq number of the new irq or a negative error value is returned.
|
|
*/
|
|
int ht_create_irq(struct pci_dev *dev, int idx)
|
|
{
|
|
return __ht_create_irq(dev, idx, NULL);
|
|
}
|
|
EXPORT_SYMBOL(ht_create_irq);
|
|
|
|
/**
|
|
* ht_destroy_irq - destroy an irq created with ht_create_irq
|
|
* @irq: irq to be destroyed
|
|
*
|
|
* This reverses ht_create_irq removing the specified irq from
|
|
* existence. The irq should be free before this happens.
|
|
*/
|
|
void ht_destroy_irq(unsigned int irq)
|
|
{
|
|
arch_teardown_ht_irq(irq);
|
|
}
|
|
EXPORT_SYMBOL(ht_destroy_irq);
|