linux/drivers/firewire/nosy.c
Arnd Bergmann 6038f373a3 llseek: automatically add .llseek fop
All file_operations should get a .llseek operation so we can make
nonseekable_open the default for future file operations without a
.llseek pointer.

The three cases that we can automatically detect are no_llseek, seq_lseek
and default_llseek. For cases where we can we can automatically prove that
the file offset is always ignored, we use noop_llseek, which maintains
the current behavior of not returning an error from a seek.

New drivers should normally not use noop_llseek but instead use no_llseek
and call nonseekable_open at open time.  Existing drivers can be converted
to do the same when the maintainer knows for certain that no user code
relies on calling seek on the device file.

The generated code is often incorrectly indented and right now contains
comments that clarify for each added line why a specific variant was
chosen. In the version that gets submitted upstream, the comments will
be gone and I will manually fix the indentation, because there does not
seem to be a way to do that using coccinelle.

Some amount of new code is currently sitting in linux-next that should get
the same modifications, which I will do at the end of the merge window.

Many thanks to Julia Lawall for helping me learn to write a semantic
patch that does all this.

===== begin semantic patch =====
// This adds an llseek= method to all file operations,
// as a preparation for making no_llseek the default.
//
// The rules are
// - use no_llseek explicitly if we do nonseekable_open
// - use seq_lseek for sequential files
// - use default_llseek if we know we access f_pos
// - use noop_llseek if we know we don't access f_pos,
//   but we still want to allow users to call lseek
//
@ open1 exists @
identifier nested_open;
@@
nested_open(...)
{
<+...
nonseekable_open(...)
...+>
}

@ open exists@
identifier open_f;
identifier i, f;
identifier open1.nested_open;
@@
int open_f(struct inode *i, struct file *f)
{
<+...
(
nonseekable_open(...)
|
nested_open(...)
)
...+>
}

@ read disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
<+...
(
   *off = E
|
   *off += E
|
   func(..., off, ...)
|
   E = *off
)
...+>
}

@ read_no_fpos disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
... when != off
}

@ write @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
<+...
(
  *off = E
|
  *off += E
|
  func(..., off, ...)
|
  E = *off
)
...+>
}

@ write_no_fpos @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
... when != off
}

@ fops0 @
identifier fops;
@@
struct file_operations fops = {
 ...
};

@ has_llseek depends on fops0 @
identifier fops0.fops;
identifier llseek_f;
@@
struct file_operations fops = {
...
 .llseek = llseek_f,
...
};

@ has_read depends on fops0 @
identifier fops0.fops;
identifier read_f;
@@
struct file_operations fops = {
...
 .read = read_f,
...
};

@ has_write depends on fops0 @
identifier fops0.fops;
identifier write_f;
@@
struct file_operations fops = {
...
 .write = write_f,
...
};

@ has_open depends on fops0 @
identifier fops0.fops;
identifier open_f;
@@
struct file_operations fops = {
...
 .open = open_f,
...
};

// use no_llseek if we call nonseekable_open
////////////////////////////////////////////
@ nonseekable1 depends on !has_llseek && has_open @
identifier fops0.fops;
identifier nso ~= "nonseekable_open";
@@
struct file_operations fops = {
...  .open = nso, ...
+.llseek = no_llseek, /* nonseekable */
};

@ nonseekable2 depends on !has_llseek @
identifier fops0.fops;
identifier open.open_f;
@@
struct file_operations fops = {
...  .open = open_f, ...
+.llseek = no_llseek, /* open uses nonseekable */
};

// use seq_lseek for sequential files
/////////////////////////////////////
@ seq depends on !has_llseek @
identifier fops0.fops;
identifier sr ~= "seq_read";
@@
struct file_operations fops = {
...  .read = sr, ...
+.llseek = seq_lseek, /* we have seq_read */
};

// use default_llseek if there is a readdir
///////////////////////////////////////////
@ fops1 depends on !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier readdir_e;
@@
// any other fop is used that changes pos
struct file_operations fops = {
... .readdir = readdir_e, ...
+.llseek = default_llseek, /* readdir is present */
};

// use default_llseek if at least one of read/write touches f_pos
/////////////////////////////////////////////////////////////////
@ fops2 depends on !fops1 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read.read_f;
@@
// read fops use offset
struct file_operations fops = {
... .read = read_f, ...
+.llseek = default_llseek, /* read accesses f_pos */
};

@ fops3 depends on !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write.write_f;
@@
// write fops use offset
struct file_operations fops = {
... .write = write_f, ...
+	.llseek = default_llseek, /* write accesses f_pos */
};

// Use noop_llseek if neither read nor write accesses f_pos
///////////////////////////////////////////////////////////

@ fops4 depends on !fops1 && !fops2 && !fops3 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
identifier write_no_fpos.write_f;
@@
// write fops use offset
struct file_operations fops = {
...
 .write = write_f,
 .read = read_f,
...
+.llseek = noop_llseek, /* read and write both use no f_pos */
};

@ depends on has_write && !has_read && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write_no_fpos.write_f;
@@
struct file_operations fops = {
... .write = write_f, ...
+.llseek = noop_llseek, /* write uses no f_pos */
};

@ depends on has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
@@
struct file_operations fops = {
... .read = read_f, ...
+.llseek = noop_llseek, /* read uses no f_pos */
};

@ depends on !has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
@@
struct file_operations fops = {
...
+.llseek = noop_llseek, /* no read or write fn */
};
===== End semantic patch =====

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Julia Lawall <julia@diku.dk>
Cc: Christoph Hellwig <hch@infradead.org>
2010-10-15 15:53:27 +02:00

723 lines
17 KiB
C

/*
* nosy - Snoop mode driver for TI PCILynx 1394 controllers
* Copyright (C) 2002-2007 Kristian Høgsberg
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/kref.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/pci.h>
#include <linux/poll.h>
#include <linux/sched.h> /* required for linux/wait.h */
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/timex.h>
#include <linux/uaccess.h>
#include <linux/wait.h>
#include <asm/atomic.h>
#include <asm/byteorder.h>
#include "nosy.h"
#include "nosy-user.h"
#define TCODE_PHY_PACKET 0x10
#define PCI_DEVICE_ID_TI_PCILYNX 0x8000
static char driver_name[] = KBUILD_MODNAME;
/* this is the physical layout of a PCL, its size is 128 bytes */
struct pcl {
__le32 next;
__le32 async_error_next;
u32 user_data;
__le32 pcl_status;
__le32 remaining_transfer_count;
__le32 next_data_buffer;
struct {
__le32 control;
__le32 pointer;
} buffer[13];
};
struct packet {
unsigned int length;
char data[0];
};
struct packet_buffer {
char *data;
size_t capacity;
long total_packet_count, lost_packet_count;
atomic_t size;
struct packet *head, *tail;
wait_queue_head_t wait;
};
struct pcilynx {
struct pci_dev *pci_device;
__iomem char *registers;
struct pcl *rcv_start_pcl, *rcv_pcl;
__le32 *rcv_buffer;
dma_addr_t rcv_start_pcl_bus, rcv_pcl_bus, rcv_buffer_bus;
spinlock_t client_list_lock;
struct list_head client_list;
struct miscdevice misc;
struct list_head link;
struct kref kref;
};
static inline struct pcilynx *
lynx_get(struct pcilynx *lynx)
{
kref_get(&lynx->kref);
return lynx;
}
static void
lynx_release(struct kref *kref)
{
kfree(container_of(kref, struct pcilynx, kref));
}
static inline void
lynx_put(struct pcilynx *lynx)
{
kref_put(&lynx->kref, lynx_release);
}
struct client {
struct pcilynx *lynx;
u32 tcode_mask;
struct packet_buffer buffer;
struct list_head link;
};
static DEFINE_MUTEX(card_mutex);
static LIST_HEAD(card_list);
static int
packet_buffer_init(struct packet_buffer *buffer, size_t capacity)
{
buffer->data = kmalloc(capacity, GFP_KERNEL);
if (buffer->data == NULL)
return -ENOMEM;
buffer->head = (struct packet *) buffer->data;
buffer->tail = (struct packet *) buffer->data;
buffer->capacity = capacity;
buffer->lost_packet_count = 0;
atomic_set(&buffer->size, 0);
init_waitqueue_head(&buffer->wait);
return 0;
}
static void
packet_buffer_destroy(struct packet_buffer *buffer)
{
kfree(buffer->data);
}
static int
packet_buffer_get(struct client *client, char __user *data, size_t user_length)
{
struct packet_buffer *buffer = &client->buffer;
size_t length;
char *end;
if (wait_event_interruptible(buffer->wait,
atomic_read(&buffer->size) > 0) ||
list_empty(&client->lynx->link))
return -ERESTARTSYS;
if (atomic_read(&buffer->size) == 0)
return -ENODEV;
/* FIXME: Check length <= user_length. */
end = buffer->data + buffer->capacity;
length = buffer->head->length;
if (&buffer->head->data[length] < end) {
if (copy_to_user(data, buffer->head->data, length))
return -EFAULT;
buffer->head = (struct packet *) &buffer->head->data[length];
} else {
size_t split = end - buffer->head->data;
if (copy_to_user(data, buffer->head->data, split))
return -EFAULT;
if (copy_to_user(data + split, buffer->data, length - split))
return -EFAULT;
buffer->head = (struct packet *) &buffer->data[length - split];
}
/*
* Decrease buffer->size as the last thing, since this is what
* keeps the interrupt from overwriting the packet we are
* retrieving from the buffer.
*/
atomic_sub(sizeof(struct packet) + length, &buffer->size);
return length;
}
static void
packet_buffer_put(struct packet_buffer *buffer, void *data, size_t length)
{
char *end;
buffer->total_packet_count++;
if (buffer->capacity <
atomic_read(&buffer->size) + sizeof(struct packet) + length) {
buffer->lost_packet_count++;
return;
}
end = buffer->data + buffer->capacity;
buffer->tail->length = length;
if (&buffer->tail->data[length] < end) {
memcpy(buffer->tail->data, data, length);
buffer->tail = (struct packet *) &buffer->tail->data[length];
} else {
size_t split = end - buffer->tail->data;
memcpy(buffer->tail->data, data, split);
memcpy(buffer->data, data + split, length - split);
buffer->tail = (struct packet *) &buffer->data[length - split];
}
/* Finally, adjust buffer size and wake up userspace reader. */
atomic_add(sizeof(struct packet) + length, &buffer->size);
wake_up_interruptible(&buffer->wait);
}
static inline void
reg_write(struct pcilynx *lynx, int offset, u32 data)
{
writel(data, lynx->registers + offset);
}
static inline u32
reg_read(struct pcilynx *lynx, int offset)
{
return readl(lynx->registers + offset);
}
static inline void
reg_set_bits(struct pcilynx *lynx, int offset, u32 mask)
{
reg_write(lynx, offset, (reg_read(lynx, offset) | mask));
}
/*
* Maybe the pcl programs could be set up to just append data instead
* of using a whole packet.
*/
static inline void
run_pcl(struct pcilynx *lynx, dma_addr_t pcl_bus,
int dmachan)
{
reg_write(lynx, DMA0_CURRENT_PCL + dmachan * 0x20, pcl_bus);
reg_write(lynx, DMA0_CHAN_CTRL + dmachan * 0x20,
DMA_CHAN_CTRL_ENABLE | DMA_CHAN_CTRL_LINK);
}
static int
set_phy_reg(struct pcilynx *lynx, int addr, int val)
{
if (addr > 15) {
dev_err(&lynx->pci_device->dev,
"PHY register address %d out of range\n", addr);
return -1;
}
if (val > 0xff) {
dev_err(&lynx->pci_device->dev,
"PHY register value %d out of range\n", val);
return -1;
}
reg_write(lynx, LINK_PHY, LINK_PHY_WRITE |
LINK_PHY_ADDR(addr) | LINK_PHY_WDATA(val));
return 0;
}
static int
nosy_open(struct inode *inode, struct file *file)
{
int minor = iminor(inode);
struct client *client;
struct pcilynx *tmp, *lynx = NULL;
mutex_lock(&card_mutex);
list_for_each_entry(tmp, &card_list, link)
if (tmp->misc.minor == minor) {
lynx = lynx_get(tmp);
break;
}
mutex_unlock(&card_mutex);
if (lynx == NULL)
return -ENODEV;
client = kmalloc(sizeof *client, GFP_KERNEL);
if (client == NULL)
goto fail;
client->tcode_mask = ~0;
client->lynx = lynx;
INIT_LIST_HEAD(&client->link);
if (packet_buffer_init(&client->buffer, 128 * 1024) < 0)
goto fail;
file->private_data = client;
return 0;
fail:
kfree(client);
lynx_put(lynx);
return -ENOMEM;
}
static int
nosy_release(struct inode *inode, struct file *file)
{
struct client *client = file->private_data;
struct pcilynx *lynx = client->lynx;
spin_lock_irq(&lynx->client_list_lock);
list_del_init(&client->link);
spin_unlock_irq(&lynx->client_list_lock);
packet_buffer_destroy(&client->buffer);
kfree(client);
lynx_put(lynx);
return 0;
}
static unsigned int
nosy_poll(struct file *file, poll_table *pt)
{
struct client *client = file->private_data;
unsigned int ret = 0;
poll_wait(file, &client->buffer.wait, pt);
if (atomic_read(&client->buffer.size) > 0)
ret = POLLIN | POLLRDNORM;
if (list_empty(&client->lynx->link))
ret |= POLLHUP;
return ret;
}
static ssize_t
nosy_read(struct file *file, char __user *buffer, size_t count, loff_t *offset)
{
struct client *client = file->private_data;
return packet_buffer_get(client, buffer, count);
}
static long
nosy_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct client *client = file->private_data;
spinlock_t *client_list_lock = &client->lynx->client_list_lock;
struct nosy_stats stats;
switch (cmd) {
case NOSY_IOC_GET_STATS:
spin_lock_irq(client_list_lock);
stats.total_packet_count = client->buffer.total_packet_count;
stats.lost_packet_count = client->buffer.lost_packet_count;
spin_unlock_irq(client_list_lock);
if (copy_to_user((void __user *) arg, &stats, sizeof stats))
return -EFAULT;
else
return 0;
case NOSY_IOC_START:
spin_lock_irq(client_list_lock);
list_add_tail(&client->link, &client->lynx->client_list);
spin_unlock_irq(client_list_lock);
return 0;
case NOSY_IOC_STOP:
spin_lock_irq(client_list_lock);
list_del_init(&client->link);
spin_unlock_irq(client_list_lock);
return 0;
case NOSY_IOC_FILTER:
spin_lock_irq(client_list_lock);
client->tcode_mask = arg;
spin_unlock_irq(client_list_lock);
return 0;
default:
return -EINVAL;
/* Flush buffer, configure filter. */
}
}
static const struct file_operations nosy_ops = {
.owner = THIS_MODULE,
.read = nosy_read,
.unlocked_ioctl = nosy_ioctl,
.poll = nosy_poll,
.open = nosy_open,
.release = nosy_release,
.llseek = noop_llseek,
};
#define PHY_PACKET_SIZE 12 /* 1 payload, 1 inverse, 1 ack = 3 quadlets */
static void
packet_irq_handler(struct pcilynx *lynx)
{
struct client *client;
u32 tcode_mask, tcode;
size_t length;
struct timeval tv;
/* FIXME: Also report rcv_speed. */
length = __le32_to_cpu(lynx->rcv_pcl->pcl_status) & 0x00001fff;
tcode = __le32_to_cpu(lynx->rcv_buffer[1]) >> 4 & 0xf;
do_gettimeofday(&tv);
lynx->rcv_buffer[0] = (__force __le32)tv.tv_usec;
if (length == PHY_PACKET_SIZE)
tcode_mask = 1 << TCODE_PHY_PACKET;
else
tcode_mask = 1 << tcode;
spin_lock(&lynx->client_list_lock);
list_for_each_entry(client, &lynx->client_list, link)
if (client->tcode_mask & tcode_mask)
packet_buffer_put(&client->buffer,
lynx->rcv_buffer, length + 4);
spin_unlock(&lynx->client_list_lock);
}
static void
bus_reset_irq_handler(struct pcilynx *lynx)
{
struct client *client;
struct timeval tv;
do_gettimeofday(&tv);
spin_lock(&lynx->client_list_lock);
list_for_each_entry(client, &lynx->client_list, link)
packet_buffer_put(&client->buffer, &tv.tv_usec, 4);
spin_unlock(&lynx->client_list_lock);
}
static irqreturn_t
irq_handler(int irq, void *device)
{
struct pcilynx *lynx = device;
u32 pci_int_status;
pci_int_status = reg_read(lynx, PCI_INT_STATUS);
if (pci_int_status == ~0)
/* Card was ejected. */
return IRQ_NONE;
if ((pci_int_status & PCI_INT_INT_PEND) == 0)
/* Not our interrupt, bail out quickly. */
return IRQ_NONE;
if ((pci_int_status & PCI_INT_P1394_INT) != 0) {
u32 link_int_status;
link_int_status = reg_read(lynx, LINK_INT_STATUS);
reg_write(lynx, LINK_INT_STATUS, link_int_status);
if ((link_int_status & LINK_INT_PHY_BUSRESET) > 0)
bus_reset_irq_handler(lynx);
}
/* Clear the PCI_INT_STATUS register only after clearing the
* LINK_INT_STATUS register; otherwise the PCI_INT_P1394 will
* be set again immediately. */
reg_write(lynx, PCI_INT_STATUS, pci_int_status);
if ((pci_int_status & PCI_INT_DMA0_HLT) > 0) {
packet_irq_handler(lynx);
run_pcl(lynx, lynx->rcv_start_pcl_bus, 0);
}
return IRQ_HANDLED;
}
static void
remove_card(struct pci_dev *dev)
{
struct pcilynx *lynx = pci_get_drvdata(dev);
struct client *client;
mutex_lock(&card_mutex);
list_del_init(&lynx->link);
misc_deregister(&lynx->misc);
mutex_unlock(&card_mutex);
reg_write(lynx, PCI_INT_ENABLE, 0);
free_irq(lynx->pci_device->irq, lynx);
spin_lock_irq(&lynx->client_list_lock);
list_for_each_entry(client, &lynx->client_list, link)
wake_up_interruptible(&client->buffer.wait);
spin_unlock_irq(&lynx->client_list_lock);
pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
lynx->rcv_start_pcl, lynx->rcv_start_pcl_bus);
pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
lynx->rcv_pcl, lynx->rcv_pcl_bus);
pci_free_consistent(lynx->pci_device, PAGE_SIZE,
lynx->rcv_buffer, lynx->rcv_buffer_bus);
iounmap(lynx->registers);
pci_disable_device(dev);
lynx_put(lynx);
}
#define RCV_BUFFER_SIZE (16 * 1024)
static int __devinit
add_card(struct pci_dev *dev, const struct pci_device_id *unused)
{
struct pcilynx *lynx;
u32 p, end;
int ret, i;
if (pci_set_dma_mask(dev, 0xffffffff)) {
dev_err(&dev->dev,
"DMA address limits not supported for PCILynx hardware\n");
return -ENXIO;
}
if (pci_enable_device(dev)) {
dev_err(&dev->dev, "Failed to enable PCILynx hardware\n");
return -ENXIO;
}
pci_set_master(dev);
lynx = kzalloc(sizeof *lynx, GFP_KERNEL);
if (lynx == NULL) {
dev_err(&dev->dev, "Failed to allocate control structure\n");
ret = -ENOMEM;
goto fail_disable;
}
lynx->pci_device = dev;
pci_set_drvdata(dev, lynx);
spin_lock_init(&lynx->client_list_lock);
INIT_LIST_HEAD(&lynx->client_list);
kref_init(&lynx->kref);
lynx->registers = ioremap_nocache(pci_resource_start(dev, 0),
PCILYNX_MAX_REGISTER);
lynx->rcv_start_pcl = pci_alloc_consistent(lynx->pci_device,
sizeof(struct pcl), &lynx->rcv_start_pcl_bus);
lynx->rcv_pcl = pci_alloc_consistent(lynx->pci_device,
sizeof(struct pcl), &lynx->rcv_pcl_bus);
lynx->rcv_buffer = pci_alloc_consistent(lynx->pci_device,
RCV_BUFFER_SIZE, &lynx->rcv_buffer_bus);
if (lynx->rcv_start_pcl == NULL ||
lynx->rcv_pcl == NULL ||
lynx->rcv_buffer == NULL) {
dev_err(&dev->dev, "Failed to allocate receive buffer\n");
ret = -ENOMEM;
goto fail_deallocate;
}
lynx->rcv_start_pcl->next = cpu_to_le32(lynx->rcv_pcl_bus);
lynx->rcv_pcl->next = cpu_to_le32(PCL_NEXT_INVALID);
lynx->rcv_pcl->async_error_next = cpu_to_le32(PCL_NEXT_INVALID);
lynx->rcv_pcl->buffer[0].control =
cpu_to_le32(PCL_CMD_RCV | PCL_BIGENDIAN | 2044);
lynx->rcv_pcl->buffer[0].pointer =
cpu_to_le32(lynx->rcv_buffer_bus + 4);
p = lynx->rcv_buffer_bus + 2048;
end = lynx->rcv_buffer_bus + RCV_BUFFER_SIZE;
for (i = 1; p < end; i++, p += 2048) {
lynx->rcv_pcl->buffer[i].control =
cpu_to_le32(PCL_CMD_RCV | PCL_BIGENDIAN | 2048);
lynx->rcv_pcl->buffer[i].pointer = cpu_to_le32(p);
}
lynx->rcv_pcl->buffer[i - 1].control |= cpu_to_le32(PCL_LAST_BUFF);
reg_set_bits(lynx, MISC_CONTROL, MISC_CONTROL_SWRESET);
/* Fix buggy cards with autoboot pin not tied low: */
reg_write(lynx, DMA0_CHAN_CTRL, 0);
reg_write(lynx, DMA_GLOBAL_REGISTER, 0x00 << 24);
#if 0
/* now, looking for PHY register set */
if ((get_phy_reg(lynx, 2) & 0xe0) == 0xe0) {
lynx->phyic.reg_1394a = 1;
PRINT(KERN_INFO, lynx->id,
"found 1394a conform PHY (using extended register set)");
lynx->phyic.vendor = get_phy_vendorid(lynx);
lynx->phyic.product = get_phy_productid(lynx);
} else {
lynx->phyic.reg_1394a = 0;
PRINT(KERN_INFO, lynx->id, "found old 1394 PHY");
}
#endif
/* Setup the general receive FIFO max size. */
reg_write(lynx, FIFO_SIZES, 255);
reg_set_bits(lynx, PCI_INT_ENABLE, PCI_INT_DMA_ALL);
reg_write(lynx, LINK_INT_ENABLE,
LINK_INT_PHY_TIME_OUT | LINK_INT_PHY_REG_RCVD |
LINK_INT_PHY_BUSRESET | LINK_INT_IT_STUCK |
LINK_INT_AT_STUCK | LINK_INT_SNTRJ |
LINK_INT_TC_ERR | LINK_INT_GRF_OVER_FLOW |
LINK_INT_ITF_UNDER_FLOW | LINK_INT_ATF_UNDER_FLOW);
/* Disable the L flag in self ID packets. */
set_phy_reg(lynx, 4, 0);
/* Put this baby into snoop mode */
reg_set_bits(lynx, LINK_CONTROL, LINK_CONTROL_SNOOP_ENABLE);
run_pcl(lynx, lynx->rcv_start_pcl_bus, 0);
if (request_irq(dev->irq, irq_handler, IRQF_SHARED,
driver_name, lynx)) {
dev_err(&dev->dev,
"Failed to allocate shared interrupt %d\n", dev->irq);
ret = -EIO;
goto fail_deallocate;
}
lynx->misc.parent = &dev->dev;
lynx->misc.minor = MISC_DYNAMIC_MINOR;
lynx->misc.name = "nosy";
lynx->misc.fops = &nosy_ops;
mutex_lock(&card_mutex);
ret = misc_register(&lynx->misc);
if (ret) {
dev_err(&dev->dev, "Failed to register misc char device\n");
mutex_unlock(&card_mutex);
goto fail_free_irq;
}
list_add_tail(&lynx->link, &card_list);
mutex_unlock(&card_mutex);
dev_info(&dev->dev,
"Initialized PCILynx IEEE1394 card, irq=%d\n", dev->irq);
return 0;
fail_free_irq:
reg_write(lynx, PCI_INT_ENABLE, 0);
free_irq(lynx->pci_device->irq, lynx);
fail_deallocate:
if (lynx->rcv_start_pcl)
pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
lynx->rcv_start_pcl, lynx->rcv_start_pcl_bus);
if (lynx->rcv_pcl)
pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
lynx->rcv_pcl, lynx->rcv_pcl_bus);
if (lynx->rcv_buffer)
pci_free_consistent(lynx->pci_device, PAGE_SIZE,
lynx->rcv_buffer, lynx->rcv_buffer_bus);
iounmap(lynx->registers);
kfree(lynx);
fail_disable:
pci_disable_device(dev);
return ret;
}
static struct pci_device_id pci_table[] __devinitdata = {
{
.vendor = PCI_VENDOR_ID_TI,
.device = PCI_DEVICE_ID_TI_PCILYNX,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
},
{ } /* Terminating entry */
};
static struct pci_driver lynx_pci_driver = {
.name = driver_name,
.id_table = pci_table,
.probe = add_card,
.remove = remove_card,
};
MODULE_AUTHOR("Kristian Hoegsberg");
MODULE_DESCRIPTION("Snoop mode driver for TI pcilynx 1394 controllers");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, pci_table);
static int __init nosy_init(void)
{
return pci_register_driver(&lynx_pci_driver);
}
static void __exit nosy_cleanup(void)
{
pci_unregister_driver(&lynx_pci_driver);
pr_info("Unloaded %s\n", driver_name);
}
module_init(nosy_init);
module_exit(nosy_cleanup);