* 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 */
#define TCODE_PHY_PACKET 0x10
#define PCI_DEVICE_ID_TI_PCILYNX 0x8000
-#define notify(s, args...) printk(KERN_NOTICE s, ## args)
-#define error(s, args...) printk(KERN_ERR s, ## args)
-#define debug(s, args...) printk(KERN_DEBUG s, ## args)
-
static char driver_name[] = KBUILD_MODNAME;
-struct pcl_status {
- unsigned int transfer_count : 13;
- unsigned int reserved0 : 1;
- unsigned int ack_type : 1;
- unsigned int ack : 4;
- unsigned int rcv_speed : 2;
- unsigned int rcv_dma_channel : 6;
- unsigned int packet_complete : 1;
- unsigned int packet_error : 1;
- unsigned int master_error : 1;
- unsigned int iso_mode : 1;
- unsigned int self_id : 1;
-};
-
/* this is the physical layout of a PCL, its size is 128 bytes */
struct pcl {
- u32 next;
- u32 async_error_next;
- u32 user_data;
- struct pcl_status pcl_status;
- u32 remaining_transfer_count;
- u32 next_data_buffer;
- struct {
- u32 control;
- u32 pointer;
- } buffer[13] __attribute__ ((packed));
-} __attribute__ ((packed));
+ __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;
struct pcilynx {
struct pci_dev *pci_device;
- unsigned char *registers;
+ __iomem char *registers;
struct pcl *rcv_start_pcl, *rcv_pcl;
- u32 *rcv_buffer;
+ __le32 *rcv_buffer;
dma_addr_t rcv_start_pcl_bus, rcv_pcl_bus, rcv_buffer_bus;
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;
- unsigned long tcode_mask;
+ u32 tcode_mask;
struct packet_buffer buffer;
struct list_head link;
};
-#define MAX_MINORS 64
-static struct pcilynx *minors[MAX_MINORS];
+static DEFINE_MUTEX(card_mutex);
+static LIST_HEAD(card_list);
static int
packet_buffer_init(struct packet_buffer *buffer, size_t capacity)
}
static int
-packet_buffer_get(struct packet_buffer *buffer, void *data, size_t user_length)
+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))
+ 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;
set_phy_reg(struct pcilynx *lynx, int addr, int val)
{
if (addr > 15) {
- debug("PHY register address %d out of range\n", addr);
+ dev_err(&lynx->pci_device->dev,
+ "PHY register address %d out of range\n", addr);
return -1;
}
-
if (val > 0xff) {
- debug("PHY register value %d out of range\n", val);
+ 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 void
-nosy_start_snoop(struct client *client)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&client->lynx->client_list_lock, flags);
- list_add_tail(&client->link, &client->lynx->client_list);
- spin_unlock_irqrestore(&client->lynx->client_list_lock, flags);
-}
-
-static void
-nosy_stop_snoop(struct client *client)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&client->lynx->client_list_lock, flags);
- list_del(&client->link);
- spin_unlock_irqrestore(&client->lynx->client_list_lock, flags);
-}
-
-static struct client *
-nosy_add_client(struct pcilynx *lynx)
+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) {
- kfree(client);
- debug("Failed to allocate packet buffer\n");
- return NULL;
- }
+ if (packet_buffer_init(&client->buffer, 128 * 1024) < 0)
+ goto fail;
- return client;
-}
+ file->private_data = client;
-static void
-nosy_remove_client(struct client *client)
-{
- nosy_stop_snoop(client);
- packet_buffer_destroy(&client->buffer);
+ return 0;
+fail:
kfree(client);
-}
+ lynx_put(lynx);
-static int
-nosy_open(struct inode *inode, struct file *file)
-{
- int minor = iminor(inode);
-
- if (minor > MAX_MINORS || minors[minor] == NULL)
- return -ENODEV;
-
- file->private_data = nosy_add_client(minors[minor]);
- if (file->private_data == NULL)
- return -ENOMEM;
- else
- return 0;
+ return -ENOMEM;
}
static int
nosy_release(struct inode *inode, struct file *file)
{
- nosy_remove_client(file->private_data);
+ 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;
}
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)
- return POLLIN | POLLRDNORM;
- else
- return 0;
+ ret = POLLIN | POLLRDNORM;
+
+ if (list_empty(&client->lynx->link))
+ ret |= POLLHUP;
+
+ return ret;
}
static ssize_t
-nosy_read(struct file *file, char *buffer, size_t count, loff_t *offset)
+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, buffer, count);
+ return packet_buffer_get(client, buffer, count);
}
-static int
-nosy_ioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
+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;
- if (copy_to_user((void *) arg, &stats, sizeof stats))
+ 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:
- nosy_start_snoop(client);
+ 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:
- nosy_stop_snoop(client);
+ 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:
}
static const struct file_operations nosy_ops = {
- .owner = THIS_MODULE,
- .read = nosy_read,
- .ioctl = nosy_ioctl,
- .poll = nosy_poll,
- .open = nosy_open,
- .release = nosy_release,
+ .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 */
-struct link_packet {
- unsigned int priority : 4;
- unsigned int tcode : 4;
- unsigned int rt : 2;
- unsigned int tlabel : 6;
- unsigned int destination : 16;
-};
-
static void
-packet_handler(struct pcilynx *lynx)
+packet_irq_handler(struct pcilynx *lynx)
{
- unsigned long flags;
struct client *client;
- unsigned long tcode_mask;
+ u32 tcode_mask, tcode;
size_t length;
- struct link_packet *packet;
struct timeval tv;
/* FIXME: Also report rcv_speed. */
- length = lynx->rcv_pcl->pcl_status.transfer_count;
- packet = (struct link_packet *) &lynx->rcv_buffer[1];
+ 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] = tv.tv_usec;
+ lynx->rcv_buffer[0] = (__force __le32)tv.tv_usec;
if (length == PHY_PACKET_SIZE)
tcode_mask = 1 << TCODE_PHY_PACKET;
else
- tcode_mask = 1 << packet->tcode;
+ tcode_mask = 1 << tcode;
- spin_lock_irqsave(&lynx->client_list_lock, flags);
+ 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_irqrestore(&lynx->client_list_lock, flags);
+ spin_unlock(&lynx->client_list_lock);
}
static void
-bus_reset_handler(struct pcilynx *lynx)
+bus_reset_irq_handler(struct pcilynx *lynx)
{
- unsigned long flags;
struct client *client;
struct timeval tv;
do_gettimeofday(&tv);
- spin_lock_irqsave(&lynx->client_list_lock, flags);
+ 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_irqrestore(&lynx->client_list_lock, flags);
+ spin_unlock(&lynx->client_list_lock);
}
static irqreturn_t
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;
reg_write(lynx, LINK_INT_STATUS, link_int_status);
if ((link_int_status & LINK_INT_PHY_BUSRESET) > 0)
- bus_reset_handler(lynx);
+ bus_reset_irq_handler(lynx);
}
/* Clear the PCI_INT_STATUS register only after clearing the
reg_write(lynx, PCI_INT_STATUS, pci_int_status);
if ((pci_int_status & PCI_INT_DMA0_HLT) > 0) {
- packet_handler(lynx);
+ packet_irq_handler(lynx);
run_pcl(lynx, lynx->rcv_start_pcl_bus, 0);
}
static void
remove_card(struct pci_dev *dev)
{
- struct pcilynx *lynx;
+ struct pcilynx *lynx = pci_get_drvdata(dev);
+ struct client *client;
- lynx = pci_get_drvdata(dev);
- if (!lynx)
- return;
- pci_set_drvdata(dev, NULL);
+ 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_buffer, lynx->rcv_buffer_bus);
iounmap(lynx->registers);
-
- minors[lynx->misc.minor] = NULL;
- misc_deregister(&lynx->misc);
-
- kfree(lynx);
+ pci_disable_device(dev);
+ lynx_put(lynx);
}
#define RCV_BUFFER_SIZE (16 * 1024)
{
struct pcilynx *lynx;
u32 p, end;
- int i;
+ int ret, i;
if (pci_set_dma_mask(dev, 0xffffffff)) {
- error("DMA address limits not supported "
- "for PCILynx hardware\n");
+ dev_err(&dev->dev,
+ "DMA address limits not supported for PCILynx hardware\n");
return -ENXIO;
}
if (pci_enable_device(dev)) {
- error("Failed to enable PCILynx hardware\n");
+ 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) {
- error("Failed to allocate control structure memory\n");
- return -ENOMEM;
+ 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);
if (lynx->rcv_start_pcl == NULL ||
lynx->rcv_pcl == NULL ||
lynx->rcv_buffer == NULL) {
- /* FIXME: do proper error handling. */
- error("Failed to allocate receive buffer\n");
- return -ENOMEM;
+ dev_err(&dev->dev, "Failed to allocate receive buffer\n");
+ ret = -ENOMEM;
+ goto fail_deallocate;
}
- lynx->rcv_start_pcl->next = lynx->rcv_pcl_bus;
- lynx->rcv_pcl->next = PCL_NEXT_INVALID;
- lynx->rcv_pcl->async_error_next = PCL_NEXT_INVALID;
+ 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 =
- PCL_CMD_RCV | PCL_BIGENDIAN | 2044;
- lynx->rcv_pcl->buffer[0].pointer = lynx->rcv_buffer_bus + 4;
+ 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 =
- PCL_CMD_RCV | PCL_BIGENDIAN | 2048;
- lynx->rcv_pcl->buffer[i].pointer = p;
+ 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 |= PCL_LAST_BUFF;
+ 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: */
if (request_irq(dev->irq, irq_handler, IRQF_SHARED,
driver_name, lynx)) {
- error("Failed to allocate shared interrupt %d\n", dev->irq);
- return -EIO;
+ 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;
- if (misc_register(&lynx->misc)) {
- error("Failed to register misc char device\n");
- return -ENOMEM;
+
+ 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;
}
- minors[lynx->misc.minor] = lynx;
+ list_add_tail(&lynx->link, &card_list);
+ mutex_unlock(&card_mutex);
- notify("Initialized PCILynx IEEE1394 card, irq=%d\n", dev->irq);
+ 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 = {
{
pci_unregister_driver(&lynx_pci_driver);
- notify("Unloaded %s.\n", driver_name);
+ pr_info("Unloaded %s\n", driver_name);
}
module_init(nosy_init);
git.samba.org / sfrench / cifs-2.6.git / blobdiff