diff options
Diffstat (limited to 'drivers/firewire/nosy.c')
| -rw-r--r-- | drivers/firewire/nosy.c | 695 |
1 files changed, 695 insertions, 0 deletions
diff --git a/drivers/firewire/nosy.c b/drivers/firewire/nosy.c new file mode 100644 index 000000000000..079710bf1197 --- /dev/null +++ b/drivers/firewire/nosy.c @@ -0,0 +1,695 @@ +/* -*- c-file-style: "linux" -*- + * + * nosy.c - Snoop mode driver for TI pcilynx 1394 controllers + * Copyright (C) 2002 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/kernel.h> +#include <linux/slab.h> +#include <linux/interrupt.h> +#include <linux/sched.h> /* required for linux/wait.h */ +#include <linux/wait.h> +#include <linux/errno.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/pci.h> +#include <linux/fs.h> +#include <linux/poll.h> +#include <linux/miscdevice.h> +#include <asm/byteorder.h> +#include <asm/atomic.h> +#include <asm/io.h> +#include <asm/uaccess.h> +#include <asm/timex.h> + +#include "nosy.h" +#include "nosy-user.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 const char driver_name[] = "nosy"; + +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)); + +struct packet { + unsigned int length : 16; + unsigned int code : 16; + 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; + unsigned char *registers; + + struct pcl *rcv_start_pcl, *rcv_pcl; + u32 *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 client { + struct pcilynx *lynx; + unsigned long tcode_mask; + struct packet_buffer buffer; + struct list_head link; +}; + +#define MAX_MINORS 64 +struct pcilynx *minors[MAX_MINORS]; + +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 packet_buffer *buffer, void *data, size_t user_length) +{ + size_t length; + char *end; + + if (wait_event_interruptible(buffer->wait, + atomic_read(&buffer->size) > 0)) + return -ERESTARTSYS; + + /* 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 setup 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) { + debug("%s: PHY register address %d out of range", + __FUNCTION__, addr); + return -1; + } + + if (val > 0xff) { + debug("%s: PHY register value %d out of range", + __FUNCTION__, 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) +{ + struct client *client; + + client = kmalloc(sizeof *client, GFP_KERNEL); + 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; + } + + return client; +} + +static void +nosy_remove_client(struct client *client) +{ + nosy_stop_snoop(client); + packet_buffer_destroy(&client->buffer); + kfree(client); +} + +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; +} + +static int +nosy_release(struct inode *inode, struct file *file) +{ + nosy_remove_client(file->private_data); + + return 0; +} + +static unsigned int +nosy_poll(struct file *file, poll_table *pt) +{ + struct client *client = file->private_data; + + poll_wait(file, &client->buffer.wait, pt); + + if (atomic_read(&client->buffer.size) > 0) + return POLLIN | POLLRDNORM; + else + return 0; +} + +static ssize_t +nosy_read(struct file *file, char *buffer, size_t count, loff_t *offset) +{ + struct client *client = file->private_data; + + return packet_buffer_get(&client->buffer, buffer, count); +} + +static int +nosy_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg) +{ + struct client *client = file->private_data; + + switch (cmd) { + case NOSY_IOC_GET_STATS: { + struct nosy_stats stats; + + 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)) + return -EFAULT; + else + return 0; + } + + case NOSY_IOC_START: + nosy_start_snoop(client); + return 0; + + case NOSY_IOC_STOP: + nosy_stop_snoop(client); + return 0; + + case NOSY_IOC_FILTER: + client->tcode_mask = arg; + return 0; + + default: + return -EINVAL; + /* Flush buffer, configure filter. */ + } +} + +static struct file_operations nosy_ops = { + .owner = THIS_MODULE, + .read = nosy_read, + .ioctl = nosy_ioctl, + .poll = nosy_poll, + .open = nosy_open, + .release = nosy_release, +}; + +#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) +{ + unsigned long flags; + struct list_head *pos; + struct client *client; + unsigned long tcode_mask; + 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]; + + do_gettimeofday(&tv); + lynx->rcv_buffer[0] = tv.tv_usec; + + if (length == PHY_PACKET_SIZE) + tcode_mask = 1 << TCODE_PHY_PACKET; + else + tcode_mask = 1 << packet->tcode; + + spin_lock_irqsave(&lynx->client_list_lock, flags); + + list_for_each(pos, &lynx->client_list) { + client = list_entry(pos, struct client, 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); +} + +static void +bus_reset_handler(struct pcilynx *lynx) +{ + unsigned long flags; + struct list_head *pos; + struct client *client; + struct timeval tv; + + do_gettimeofday(&tv); + + spin_lock_irqsave(&lynx->client_list_lock, flags); + + list_for_each(pos, &lynx->client_list) { + client = list_entry(pos, struct client, link); + packet_buffer_put(&client->buffer, &tv.tv_usec, 4); + } + + spin_unlock_irqrestore(&lynx->client_list_lock, flags); +} + + + +static irqreturn_t +irq_handler(int irq, void *device) +{ + struct pcilynx *lynx = (struct pcilynx *) device; + u32 pci_int_status; + + pci_int_status = reg_read(lynx, PCI_INT_STATUS); + + 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_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_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; + + lynx = pci_get_drvdata(dev); + if (!lynx) + return; + pci_set_drvdata(dev, NULL); + + reg_write(lynx, PCI_INT_ENABLE, 0); + free_irq(lynx->pci_device->irq, lynx); + + 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); + + minors[lynx->misc.minor] = NULL; + misc_deregister(&lynx->misc); + + kfree(lynx); +} + +#define RCV_BUFFER_SIZE (16 * 1024) + +#define FAIL(s, args...) \ + do { \ + error(s, ## args); \ + return err; \ + } while (0) + +static int __devinit +add_card(struct pci_dev *dev, const struct pci_device_id *unused) +{ + struct pcilynx *lynx; + u32 p, end; + int err, i; + + err = -ENXIO; + + if (pci_set_dma_mask(dev, 0xffffffff)) + FAIL("DMA address limits not supported " + "for PCILynx hardware.\n"); + if (pci_enable_device(dev)) + FAIL("Failed to enable PCILynx hardware.\n"); + pci_set_master(dev); + + err = -ENOMEM; + + lynx = kzalloc(sizeof *lynx, GFP_KERNEL); + if (lynx == NULL) + FAIL("Failed to allocate control structure memory.\n"); + + lynx->pci_device = dev; + pci_set_drvdata(dev, lynx); + + spin_lock_init(&lynx->client_list_lock); + INIT_LIST_HEAD(&lynx->client_list); + + 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) + /* FIXME: do proper error handling. */ + FAIL("Failed to allocate receive buffer.\n"); + + 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_pcl->buffer[0].control = + PCL_CMD_RCV | PCL_BIGENDIAN | 2044; + lynx->rcv_pcl->buffer[0].pointer = 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; + } + lynx->rcv_pcl->buffer[i - 1].control |= 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)) + FAIL("Failed to allocate shared interrupt %d.", dev->irq); + + 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)) + FAIL("Failed to register misc char device."); + minors[lynx->misc.minor] = lynx; + + notify("Initialized PCILynx IEEE1394 card, irq=%d\n", dev->irq); + + return 0; +} + +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 = (char *) driver_name, + .id_table = pci_table, + .probe = add_card, + .remove = __devexit_p(remove_card), +}; + +MODULE_AUTHOR("Kristian Høgsberg"); +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) +{ + /* notify("Loaded %s version %s.\n", driver_name, VERSION); */ + + return pci_register_driver(&lynx_pci_driver); +} + +static void __exit nosy_cleanup(void) +{ + pci_unregister_driver(&lynx_pci_driver); + + notify("Unloaded %s.\n", driver_name); +} + + +module_init(nosy_init); +module_exit(nosy_cleanup); |