diff options
Diffstat (limited to 'drivers/firewire/nosy.c')
| -rw-r--r-- | drivers/firewire/nosy.c | 712 |
1 files changed, 712 insertions, 0 deletions
diff --git a/drivers/firewire/nosy.c b/drivers/firewire/nosy.c new file mode 100644 index 000000000..88ed971e3 --- /dev/null +++ b/drivers/firewire/nosy.c @@ -0,0 +1,712 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * nosy - Snoop mode driver for TI PCILynx 1394 controllers + * Copyright (C) 2002-2007 Kristian Høgsberg + */ + +#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/time64.h> +#include <linux/timex.h> +#include <linux/uaccess.h> +#include <linux/wait.h> +#include <linux/dma-mapping.h> +#include <linux/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[]; +}; + +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 stream_open(inode, file); +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 __poll_t +nosy_poll(struct file *file, poll_table *pt) +{ + struct client *client = file->private_data; + __poll_t ret = 0; + + poll_wait(file, &client->buffer.wait, pt); + + if (atomic_read(&client->buffer.size) > 0) + ret = EPOLLIN | EPOLLRDNORM; + + if (list_empty(&client->lynx->link)) + ret |= EPOLLHUP; + + 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; + int ret; + + 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: + ret = -EBUSY; + spin_lock_irq(client_list_lock); + if (list_empty(&client->link)) { + list_add_tail(&client->link, &client->lynx->client_list); + ret = 0; + } + spin_unlock_irq(client_list_lock); + + return ret; + + 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, +}; + +#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, timestamp; + size_t length; + struct timespec64 ts64; + + /* 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; + + ktime_get_real_ts64(&ts64); + timestamp = ts64.tv_nsec / NSEC_PER_USEC; + lynx->rcv_buffer[0] = (__force __le32)timestamp; + + 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 timespec64 ts64; + u32 timestamp; + + ktime_get_real_ts64(&ts64); + timestamp = ts64.tv_nsec / NSEC_PER_USEC; + + spin_lock(&lynx->client_list_lock); + + list_for_each_entry(client, &lynx->client_list, link) + packet_buffer_put(&client->buffer, ×tamp, 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 +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, DMA_BIT_MASK(32))) { + 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(pci_resource_start(dev, 0), + PCILYNX_MAX_REGISTER); + if (lynx->registers == NULL) { + dev_err(&dev->dev, "Failed to map registers\n"); + ret = -ENOMEM; + goto fail_deallocate_lynx; + } + + 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_buffers; + } + 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_buffers; + } + + 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_buffers: + 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); + +fail_deallocate_lynx: + kfree(lynx); + +fail_disable: + pci_disable_device(dev); + + return ret; +} + +static struct pci_device_id pci_table[] = { + { + .vendor = PCI_VENDOR_ID_TI, + .device = PCI_DEVICE_ID_TI_PCILYNX, + .subvendor = PCI_ANY_ID, + .subdevice = PCI_ANY_ID, + }, + { } /* Terminating entry */ +}; + +MODULE_DEVICE_TABLE(pci, pci_table); + +static struct pci_driver lynx_pci_driver = { + .name = driver_name, + .id_table = pci_table, + .probe = add_card, + .remove = remove_card, +}; + +module_pci_driver(lynx_pci_driver); + +MODULE_AUTHOR("Kristian Hoegsberg"); +MODULE_DESCRIPTION("Snoop mode driver for TI pcilynx 1394 controllers"); +MODULE_LICENSE("GPL"); |