diff options
Diffstat (limited to 'drivers/ieee1394/ieee1394_core.c')
| -rw-r--r-- | drivers/ieee1394/ieee1394_core.c | 1379 |
1 files changed, 1379 insertions, 0 deletions
diff --git a/drivers/ieee1394/ieee1394_core.c b/drivers/ieee1394/ieee1394_core.c new file mode 100644 index 0000000..dcdb71a --- /dev/null +++ b/drivers/ieee1394/ieee1394_core.c @@ -0,0 +1,1379 @@ +/* + * IEEE 1394 for Linux + * + * Core support: hpsb_packet management, packet handling and forwarding to + * highlevel or lowlevel code + * + * Copyright (C) 1999, 2000 Andreas E. Bombe + * 2002 Manfred Weihs <weihs@ict.tuwien.ac.at> + * + * This code is licensed under the GPL. See the file COPYING in the root + * directory of the kernel sources for details. + * + * + * Contributions: + * + * Manfred Weihs <weihs@ict.tuwien.ac.at> + * loopback functionality in hpsb_send_packet + * allow highlevel drivers to disable automatic response generation + * and to generate responses themselves (deferred) + * + */ + +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/string.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/bitops.h> +#include <linux/kdev_t.h> +#include <linux/freezer.h> +#include <linux/suspend.h> +#include <linux/kthread.h> +#include <linux/preempt.h> +#include <linux/time.h> + +#include <asm/system.h> +#include <asm/byteorder.h> + +#include "ieee1394_types.h" +#include "ieee1394.h" +#include "hosts.h" +#include "ieee1394_core.h" +#include "highlevel.h" +#include "ieee1394_transactions.h" +#include "csr.h" +#include "nodemgr.h" +#include "dma.h" +#include "iso.h" +#include "config_roms.h" + +/* + * Disable the nodemgr detection and config rom reading functionality. + */ +static int disable_nodemgr; +module_param(disable_nodemgr, int, 0444); +MODULE_PARM_DESC(disable_nodemgr, "Disable nodemgr functionality."); + +/* Disable Isochronous Resource Manager functionality */ +int hpsb_disable_irm = 0; +module_param_named(disable_irm, hpsb_disable_irm, bool, 0444); +MODULE_PARM_DESC(disable_irm, + "Disable Isochronous Resource Manager functionality."); + +/* We are GPL, so treat us special */ +MODULE_LICENSE("GPL"); + +/* Some globals used */ +const char *hpsb_speedto_str[] = { "S100", "S200", "S400", "S800", "S1600", "S3200" }; +struct class *hpsb_protocol_class; + +#ifdef CONFIG_IEEE1394_VERBOSEDEBUG +static void dump_packet(const char *text, quadlet_t *data, int size, int speed) +{ + int i; + + size /= 4; + size = (size > 4 ? 4 : size); + + printk(KERN_DEBUG "ieee1394: %s", text); + if (speed > -1 && speed < 6) + printk(" at %s", hpsb_speedto_str[speed]); + printk(":"); + for (i = 0; i < size; i++) + printk(" %08x", data[i]); + printk("\n"); +} +#else +#define dump_packet(a,b,c,d) do {} while (0) +#endif + +static void abort_requests(struct hpsb_host *host); +static void queue_packet_complete(struct hpsb_packet *packet); + + +/** + * hpsb_set_packet_complete_task - set task that runs when a packet completes + * @packet: the packet whose completion we want the task added to + * @routine: function to call + * @data: data (if any) to pass to the above function + * + * Set the task that runs when a packet completes. You cannot call this more + * than once on a single packet before it is sent. + * + * Typically, the complete @routine is responsible to call hpsb_free_packet(). + */ +void hpsb_set_packet_complete_task(struct hpsb_packet *packet, + void (*routine)(void *), void *data) +{ + WARN_ON(packet->complete_routine != NULL); + packet->complete_routine = routine; + packet->complete_data = data; + return; +} + +/** + * hpsb_alloc_packet - allocate new packet structure + * @data_size: size of the data block to be allocated, in bytes + * + * This function allocates, initializes and returns a new &struct hpsb_packet. + * It can be used in interrupt context. A header block is always included and + * initialized with zeros. Its size is big enough to contain all possible 1394 + * headers. The data block is only allocated if @data_size is not zero. + * + * For packets for which responses will be received the @data_size has to be big + * enough to contain the response's data block since no further allocation + * occurs at response matching time. + * + * The packet's generation value will be set to the current generation number + * for ease of use. Remember to overwrite it with your own recorded generation + * number if you can not be sure that your code will not race with a bus reset. + * + * Return value: A pointer to a &struct hpsb_packet or NULL on allocation + * failure. + */ +struct hpsb_packet *hpsb_alloc_packet(size_t data_size) +{ + struct hpsb_packet *packet; + + data_size = ((data_size + 3) & ~3); + + packet = kzalloc(sizeof(*packet) + data_size, GFP_ATOMIC); + if (!packet) + return NULL; + + packet->state = hpsb_unused; + packet->generation = -1; + INIT_LIST_HEAD(&packet->driver_list); + INIT_LIST_HEAD(&packet->queue); + atomic_set(&packet->refcnt, 1); + + if (data_size) { + packet->data = packet->embedded_data; + packet->allocated_data_size = data_size; + } + return packet; +} + +/** + * hpsb_free_packet - free packet and data associated with it + * @packet: packet to free (is NULL safe) + * + * Frees @packet->data only if it was allocated through hpsb_alloc_packet(). + */ +void hpsb_free_packet(struct hpsb_packet *packet) +{ + if (packet && atomic_dec_and_test(&packet->refcnt)) { + BUG_ON(!list_empty(&packet->driver_list) || + !list_empty(&packet->queue)); + kfree(packet); + } +} + +/** + * hpsb_reset_bus - initiate bus reset on the given host + * @host: host controller whose bus to reset + * @type: one of enum reset_types + * + * Returns 1 if bus reset already in progress, 0 otherwise. + */ +int hpsb_reset_bus(struct hpsb_host *host, int type) +{ + if (!host->in_bus_reset) { + host->driver->devctl(host, RESET_BUS, type); + return 0; + } else { + return 1; + } +} + +/** + * hpsb_read_cycle_timer - read cycle timer register and system time + * @host: host whose isochronous cycle timer register is read + * @cycle_timer: address of bitfield to return the register contents + * @local_time: address to return the system time + * + * The format of * @cycle_timer, is described in OHCI 1.1 clause 5.13. This + * format is also read from non-OHCI controllers. * @local_time contains the + * system time in microseconds since the Epoch, read at the moment when the + * cycle timer was read. + * + * Return value: 0 for success or error number otherwise. + */ +int hpsb_read_cycle_timer(struct hpsb_host *host, u32 *cycle_timer, + u64 *local_time) +{ + int ctr; + struct timeval tv; + unsigned long flags; + + if (!host || !cycle_timer || !local_time) + return -EINVAL; + + preempt_disable(); + local_irq_save(flags); + + ctr = host->driver->devctl(host, GET_CYCLE_COUNTER, 0); + if (ctr) + do_gettimeofday(&tv); + + local_irq_restore(flags); + preempt_enable(); + + if (!ctr) + return -EIO; + *cycle_timer = ctr; + *local_time = tv.tv_sec * 1000000ULL + tv.tv_usec; + return 0; +} + +/** + * hpsb_bus_reset - notify a bus reset to the core + * + * For host driver module usage. Safe to use in interrupt context, although + * quite complex; so you may want to run it in the bottom rather than top half. + * + * Returns 1 if bus reset already in progress, 0 otherwise. + */ +int hpsb_bus_reset(struct hpsb_host *host) +{ + if (host->in_bus_reset) { + HPSB_NOTICE("%s called while bus reset already in progress", + __func__); + return 1; + } + + abort_requests(host); + host->in_bus_reset = 1; + host->irm_id = -1; + host->is_irm = 0; + host->busmgr_id = -1; + host->is_busmgr = 0; + host->is_cycmst = 0; + host->node_count = 0; + host->selfid_count = 0; + + return 0; +} + + +/* + * Verify num_of_selfids SelfIDs and return number of nodes. Return zero in + * case verification failed. + */ +static int check_selfids(struct hpsb_host *host) +{ + int nodeid = -1; + int rest_of_selfids = host->selfid_count; + struct selfid *sid = (struct selfid *)host->topology_map; + struct ext_selfid *esid; + int esid_seq = 23; + + host->nodes_active = 0; + + while (rest_of_selfids--) { + if (!sid->extended) { + nodeid++; + esid_seq = 0; + + if (sid->phy_id != nodeid) { + HPSB_INFO("SelfIDs failed monotony check with " + "%d", sid->phy_id); + return 0; + } + + if (sid->link_active) { + host->nodes_active++; + if (sid->contender) + host->irm_id = LOCAL_BUS | sid->phy_id; + } + } else { + esid = (struct ext_selfid *)sid; + + if ((esid->phy_id != nodeid) + || (esid->seq_nr != esid_seq)) { + HPSB_INFO("SelfIDs failed monotony check with " + "%d/%d", esid->phy_id, esid->seq_nr); + return 0; + } + esid_seq++; + } + sid++; + } + + esid = (struct ext_selfid *)(sid - 1); + while (esid->extended) { + if ((esid->porta == SELFID_PORT_PARENT) || + (esid->portb == SELFID_PORT_PARENT) || + (esid->portc == SELFID_PORT_PARENT) || + (esid->portd == SELFID_PORT_PARENT) || + (esid->porte == SELFID_PORT_PARENT) || + (esid->portf == SELFID_PORT_PARENT) || + (esid->portg == SELFID_PORT_PARENT) || + (esid->porth == SELFID_PORT_PARENT)) { + HPSB_INFO("SelfIDs failed root check on " + "extended SelfID"); + return 0; + } + esid--; + } + + sid = (struct selfid *)esid; + if ((sid->port0 == SELFID_PORT_PARENT) || + (sid->port1 == SELFID_PORT_PARENT) || + (sid->port2 == SELFID_PORT_PARENT)) { + HPSB_INFO("SelfIDs failed root check"); + return 0; + } + + host->node_count = nodeid + 1; + return 1; +} + +static void build_speed_map(struct hpsb_host *host, int nodecount) +{ + u8 cldcnt[nodecount]; + u8 *map = host->speed_map; + u8 *speedcap = host->speed; + struct selfid *sid; + struct ext_selfid *esid; + int i, j, n; + + for (i = 0; i < (nodecount * 64); i += 64) { + for (j = 0; j < nodecount; j++) { + map[i+j] = IEEE1394_SPEED_MAX; + } + } + + for (i = 0; i < nodecount; i++) { + cldcnt[i] = 0; + } + + /* find direct children count and speed */ + for (sid = (struct selfid *)&host->topology_map[host->selfid_count-1], + n = nodecount - 1; + (void *)sid >= (void *)host->topology_map; sid--) { + if (sid->extended) { + esid = (struct ext_selfid *)sid; + + if (esid->porta == SELFID_PORT_CHILD) cldcnt[n]++; + if (esid->portb == SELFID_PORT_CHILD) cldcnt[n]++; + if (esid->portc == SELFID_PORT_CHILD) cldcnt[n]++; + if (esid->portd == SELFID_PORT_CHILD) cldcnt[n]++; + if (esid->porte == SELFID_PORT_CHILD) cldcnt[n]++; + if (esid->portf == SELFID_PORT_CHILD) cldcnt[n]++; + if (esid->portg == SELFID_PORT_CHILD) cldcnt[n]++; + if (esid->porth == SELFID_PORT_CHILD) cldcnt[n]++; + } else { + if (sid->port0 == SELFID_PORT_CHILD) cldcnt[n]++; + if (sid->port1 == SELFID_PORT_CHILD) cldcnt[n]++; + if (sid->port2 == SELFID_PORT_CHILD) cldcnt[n]++; + + speedcap[n] = sid->speed; + if (speedcap[n] > host->csr.lnk_spd) + speedcap[n] = host->csr.lnk_spd; + n--; + } + } + + /* set self mapping */ + for (i = 0; i < nodecount; i++) { + map[64*i + i] = speedcap[i]; + } + + /* fix up direct children count to total children count; + * also fix up speedcaps for sibling and parent communication */ + for (i = 1; i < nodecount; i++) { + for (j = cldcnt[i], n = i - 1; j > 0; j--) { + cldcnt[i] += cldcnt[n]; + speedcap[n] = min(speedcap[n], speedcap[i]); + n -= cldcnt[n] + 1; + } + } + + for (n = 0; n < nodecount; n++) { + for (i = n - cldcnt[n]; i <= n; i++) { + for (j = 0; j < (n - cldcnt[n]); j++) { + map[j*64 + i] = map[i*64 + j] = + min(map[i*64 + j], speedcap[n]); + } + for (j = n + 1; j < nodecount; j++) { + map[j*64 + i] = map[i*64 + j] = + min(map[i*64 + j], speedcap[n]); + } + } + } + +#if SELFID_SPEED_UNKNOWN != IEEE1394_SPEED_MAX + /* assume maximum speed for 1394b PHYs, nodemgr will correct it */ + for (n = 0; n < nodecount; n++) + if (speedcap[n] == SELFID_SPEED_UNKNOWN) + speedcap[n] = IEEE1394_SPEED_MAX; +#endif +} + + +/** + * hpsb_selfid_received - hand over received selfid packet to the core + * + * For host driver module usage. Safe to use in interrupt context. + * + * The host driver should have done a successful complement check (second + * quadlet is complement of first) beforehand. + */ +void hpsb_selfid_received(struct hpsb_host *host, quadlet_t sid) +{ + if (host->in_bus_reset) { + HPSB_VERBOSE("Including SelfID 0x%x", sid); + host->topology_map[host->selfid_count++] = sid; + } else { + HPSB_NOTICE("Spurious SelfID packet (0x%08x) received from bus %d", + sid, NODEID_TO_BUS(host->node_id)); + } +} + +/** + * hpsb_selfid_complete - notify completion of SelfID stage to the core + * + * For host driver module usage. Safe to use in interrupt context, although + * quite complex; so you may want to run it in the bottom rather than top half. + * + * Notify completion of SelfID stage to the core and report new physical ID + * and whether host is root now. + */ +void hpsb_selfid_complete(struct hpsb_host *host, int phyid, int isroot) +{ + if (!host->in_bus_reset) + HPSB_NOTICE("SelfID completion called outside of bus reset!"); + + host->node_id = LOCAL_BUS | phyid; + host->is_root = isroot; + + if (!check_selfids(host)) { + if (host->reset_retries++ < 20) { + /* selfid stage did not complete without error */ + HPSB_NOTICE("Error in SelfID stage, resetting"); + host->in_bus_reset = 0; + /* this should work from ohci1394 now... */ + hpsb_reset_bus(host, LONG_RESET); + return; + } else { + HPSB_NOTICE("Stopping out-of-control reset loop"); + HPSB_NOTICE("Warning - topology map and speed map will not be valid"); + host->reset_retries = 0; + } + } else { + host->reset_retries = 0; + build_speed_map(host, host->node_count); + } + + HPSB_VERBOSE("selfid_complete called with successful SelfID stage " + "... irm_id: 0x%X node_id: 0x%X",host->irm_id,host->node_id); + + /* irm_id is kept up to date by check_selfids() */ + if (host->irm_id == host->node_id) { + host->is_irm = 1; + } else { + host->is_busmgr = 0; + host->is_irm = 0; + } + + if (isroot) { + host->driver->devctl(host, ACT_CYCLE_MASTER, 1); + host->is_cycmst = 1; + } + atomic_inc(&host->generation); + host->in_bus_reset = 0; + highlevel_host_reset(host); +} + +static DEFINE_SPINLOCK(pending_packets_lock); + +/** + * hpsb_packet_sent - notify core of sending a packet + * + * For host driver module usage. Safe to call from within a transmit packet + * routine. + * + * Notify core of sending a packet. Ackcode is the ack code returned for async + * transmits or ACKX_SEND_ERROR if the transmission failed completely; ACKX_NONE + * for other cases (internal errors that don't justify a panic). + */ +void hpsb_packet_sent(struct hpsb_host *host, struct hpsb_packet *packet, + int ackcode) +{ + unsigned long flags; + + spin_lock_irqsave(&pending_packets_lock, flags); + + packet->ack_code = ackcode; + + if (packet->no_waiter || packet->state == hpsb_complete) { + /* if packet->no_waiter, must not have a tlabel allocated */ + spin_unlock_irqrestore(&pending_packets_lock, flags); + hpsb_free_packet(packet); + return; + } + + atomic_dec(&packet->refcnt); /* drop HC's reference */ + /* here the packet must be on the host->pending_packets queue */ + + if (ackcode != ACK_PENDING || !packet->expect_response) { + packet->state = hpsb_complete; + list_del_init(&packet->queue); + spin_unlock_irqrestore(&pending_packets_lock, flags); + queue_packet_complete(packet); + return; + } + + packet->state = hpsb_pending; + packet->sendtime = jiffies; + + spin_unlock_irqrestore(&pending_packets_lock, flags); + + mod_timer(&host->timeout, jiffies + host->timeout_interval); +} + +/** + * hpsb_send_phy_config - transmit a PHY configuration packet on the bus + * @host: host that PHY config packet gets sent through + * @rootid: root whose force_root bit should get set (-1 = don't set force_root) + * @gapcnt: gap count value to set (-1 = don't set gap count) + * + * This function sends a PHY config packet on the bus through the specified + * host. + * + * Return value: 0 for success or negative error number otherwise. + */ +int hpsb_send_phy_config(struct hpsb_host *host, int rootid, int gapcnt) +{ + struct hpsb_packet *packet; + quadlet_t d = 0; + int retval = 0; + + if (rootid >= ALL_NODES || rootid < -1 || gapcnt > 0x3f || gapcnt < -1 || + (rootid == -1 && gapcnt == -1)) { + HPSB_DEBUG("Invalid Parameter: rootid = %d gapcnt = %d", + rootid, gapcnt); + return -EINVAL; + } + + if (rootid != -1) + d |= PHYPACKET_PHYCONFIG_R | rootid << PHYPACKET_PORT_SHIFT; + if (gapcnt != -1) + d |= PHYPACKET_PHYCONFIG_T | gapcnt << PHYPACKET_GAPCOUNT_SHIFT; + + packet = hpsb_make_phypacket(host, d); + if (!packet) + return -ENOMEM; + + packet->generation = get_hpsb_generation(host); + retval = hpsb_send_packet_and_wait(packet); + hpsb_free_packet(packet); + + return retval; +} + +/** + * hpsb_send_packet - transmit a packet on the bus + * @packet: packet to send + * + * The packet is sent through the host specified in the packet->host field. + * Before sending, the packet's transmit speed is automatically determined + * using the local speed map when it is an async, non-broadcast packet. + * + * Possibilities for failure are that host is either not initialized, in bus + * reset, the packet's generation number doesn't match the current generation + * number or the host reports a transmit error. + * + * Return value: 0 on success, negative errno on failure. + */ +int hpsb_send_packet(struct hpsb_packet *packet) +{ + struct hpsb_host *host = packet->host; + + if (host->is_shutdown) + return -EINVAL; + if (host->in_bus_reset || + (packet->generation != get_hpsb_generation(host))) + return -EAGAIN; + + packet->state = hpsb_queued; + + /* This just seems silly to me */ + WARN_ON(packet->no_waiter && packet->expect_response); + + if (!packet->no_waiter || packet->expect_response) { + unsigned long flags; + + atomic_inc(&packet->refcnt); + /* Set the initial "sendtime" to 10 seconds from now, to + prevent premature expiry. If a packet takes more than + 10 seconds to hit the wire, we have bigger problems :) */ + packet->sendtime = jiffies + 10 * HZ; + spin_lock_irqsave(&pending_packets_lock, flags); + list_add_tail(&packet->queue, &host->pending_packets); + spin_unlock_irqrestore(&pending_packets_lock, flags); + } + + if (packet->node_id == host->node_id) { + /* it is a local request, so handle it locally */ + + quadlet_t *data; + size_t size = packet->data_size + packet->header_size; + + data = kmalloc(size, GFP_ATOMIC); + if (!data) { + HPSB_ERR("unable to allocate memory for concatenating header and data"); + return -ENOMEM; + } + + memcpy(data, packet->header, packet->header_size); + + if (packet->data_size) + memcpy(((u8*)data) + packet->header_size, packet->data, packet->data_size); + + dump_packet("send packet local", packet->header, packet->header_size, -1); + + hpsb_packet_sent(host, packet, packet->expect_response ? ACK_PENDING : ACK_COMPLETE); + hpsb_packet_received(host, data, size, 0); + + kfree(data); + + return 0; + } + + if (packet->type == hpsb_async && + NODEID_TO_NODE(packet->node_id) != ALL_NODES) + packet->speed_code = + host->speed[NODEID_TO_NODE(packet->node_id)]; + + dump_packet("send packet", packet->header, packet->header_size, packet->speed_code); + + return host->driver->transmit_packet(host, packet); +} + +/* We could just use complete() directly as the packet complete + * callback, but this is more typesafe, in the sense that we get a + * compiler error if the prototype for complete() changes. */ + +static void complete_packet(void *data) +{ + complete((struct completion *) data); +} + +/** + * hpsb_send_packet_and_wait - enqueue packet, block until transaction completes + * @packet: packet to send + * + * Return value: 0 on success, negative errno on failure. + */ +int hpsb_send_packet_and_wait(struct hpsb_packet *packet) +{ + struct completion done; + int retval; + + init_completion(&done); + hpsb_set_packet_complete_task(packet, complete_packet, &done); + retval = hpsb_send_packet(packet); + if (retval == 0) + wait_for_completion(&done); + + return retval; +} + +static void send_packet_nocare(struct hpsb_packet *packet) +{ + if (hpsb_send_packet(packet) < 0) { + hpsb_free_packet(packet); + } +} + +static size_t packet_size_to_data_size(size_t packet_size, size_t header_size, + size_t buffer_size, int tcode) +{ + size_t ret = packet_size <= header_size ? 0 : packet_size - header_size; + + if (unlikely(ret > buffer_size)) + ret = buffer_size; + + if (unlikely(ret + header_size != packet_size)) + HPSB_ERR("unexpected packet size %zd (tcode %d), bug?", + packet_size, tcode); + return ret; +} + +static void handle_packet_response(struct hpsb_host *host, int tcode, + quadlet_t *data, size_t size) +{ + struct hpsb_packet *packet; + int tlabel = (data[0] >> 10) & 0x3f; + size_t header_size; + unsigned long flags; + + spin_lock_irqsave(&pending_packets_lock, flags); + + list_for_each_entry(packet, &host->pending_packets, queue) + if (packet->tlabel == tlabel && + packet->node_id == (data[1] >> 16)) + goto found; + + spin_unlock_irqrestore(&pending_packets_lock, flags); + HPSB_DEBUG("unsolicited response packet received - %s", + "no tlabel match"); + dump_packet("contents", data, 16, -1); + return; + +found: + switch (packet->tcode) { + case TCODE_WRITEQ: + case TCODE_WRITEB: + if (unlikely(tcode != TCODE_WRITE_RESPONSE)) + break; + header_size = 12; + size = 0; + goto dequeue; + + case TCODE_READQ: + if (unlikely(tcode != TCODE_READQ_RESPONSE)) + break; + header_size = 16; + size = 0; + goto dequeue; + + case TCODE_READB: + if (unlikely(tcode != TCODE_READB_RESPONSE)) + break; + header_size = 16; + size = packet_size_to_data_size(size, header_size, + packet->allocated_data_size, + tcode); + goto dequeue; + + case TCODE_LOCK_REQUEST: + if (unlikely(tcode != TCODE_LOCK_RESPONSE)) + break; + header_size = 16; + size = packet_size_to_data_size(min(size, (size_t)(16 + 8)), + header_size, + packet->allocated_data_size, + tcode); + goto dequeue; + } + + spin_unlock_irqrestore(&pending_packets_lock, flags); + HPSB_DEBUG("unsolicited response packet received - %s", + "tcode mismatch"); + dump_packet("contents", data, 16, -1); + return; + +dequeue: + list_del_init(&packet->queue); + spin_unlock_irqrestore(&pending_packets_lock, flags); + + if (packet->state == hpsb_queued) { + packet->sendtime = jiffies; + packet->ack_code = ACK_PENDING; + } + packet->state = hpsb_complete; + + memcpy(packet->header, data, header_size); + if (size) + memcpy(packet->data, data + 4, size); + + queue_packet_complete(packet); +} + + +static struct hpsb_packet *create_reply_packet(struct hpsb_host *host, + quadlet_t *data, size_t dsize) +{ + struct hpsb_packet *p; + + p = hpsb_alloc_packet(dsize); + if (unlikely(p == NULL)) { + /* FIXME - send data_error response */ + HPSB_ERR("out of memory, cannot send response packet"); + return NULL; + } + + p->type = hpsb_async; + p->state = hpsb_unused; + p->host = host; + p->node_id = data[1] >> 16; + p->tlabel = (data[0] >> 10) & 0x3f; + p->no_waiter = 1; + + p->generation = get_hpsb_generation(host); + + if (dsize % 4) + p->data[dsize / 4] = 0; + + return p; +} + +#define PREP_ASYNC_HEAD_RCODE(tc) \ + packet->tcode = tc; \ + packet->header[0] = (packet->node_id << 16) | (packet->tlabel << 10) \ + | (1 << 8) | (tc << 4); \ + packet->header[1] = (packet->host->node_id << 16) | (rcode << 12); \ + packet->header[2] = 0 + +static void fill_async_readquad_resp(struct hpsb_packet *packet, int rcode, + quadlet_t data) +{ + PREP_ASYNC_HEAD_RCODE(TCODE_READQ_RESPONSE); + packet->header[3] = data; + packet->header_size = 16; + packet->data_size = 0; +} + +static void fill_async_readblock_resp(struct hpsb_packet *packet, int rcode, + int length) +{ + if (rcode != RCODE_COMPLETE) + length = 0; + + PREP_ASYNC_HEAD_RCODE(TCODE_READB_RESPONSE); + packet->header[3] = length << 16; + packet->header_size = 16; + packet->data_size = length + (length % 4 ? 4 - (length % 4) : 0); +} + +static void fill_async_write_resp(struct hpsb_packet *packet, int rcode) +{ + PREP_ASYNC_HEAD_RCODE(TCODE_WRITE_RESPONSE); + packet->header_size = 12; + packet->data_size = 0; +} + +static void fill_async_lock_resp(struct hpsb_packet *packet, int rcode, int extcode, + int length) +{ + if (rcode != RCODE_COMPLETE) + length = 0; + + PREP_ASYNC_HEAD_RCODE(TCODE_LOCK_RESPONSE); + packet->header[3] = (length << 16) | extcode; + packet->header_size = 16; + packet->data_size = length; +} + +static void handle_incoming_packet(struct hpsb_host *host, int tcode, + quadlet_t *data, size_t size, + int write_acked) +{ + struct hpsb_packet *packet; + int length, rcode, extcode; + quadlet_t buffer; + nodeid_t source = data[1] >> 16; + nodeid_t dest = data[0] >> 16; + u16 flags = (u16) data[0]; + u64 addr; + + /* FIXME? + * Out-of-bounds lengths are left for highlevel_read|write to cap. */ + + switch (tcode) { + case TCODE_WRITEQ: + addr = (((u64)(data[1] & 0xffff)) << 32) | data[2]; + rcode = highlevel_write(host, source, dest, data + 3, + addr, 4, flags); + goto handle_write_request; + + case TCODE_WRITEB: + addr = (((u64)(data[1] & 0xffff)) << 32) | data[2]; + rcode = highlevel_write(host, source, dest, data + 4, + addr, data[3] >> 16, flags); +handle_write_request: + if (rcode < 0 || write_acked || + NODEID_TO_NODE(data[0] >> 16) == NODE_MASK) + return; + /* not a broadcast write, reply */ + packet = create_reply_packet(host, data, 0); + if (packet) { + fill_async_write_resp(packet, rcode); + send_packet_nocare(packet); + } + return; + + case TCODE_READQ: + addr = (((u64)(data[1] & 0xffff)) << 32) | data[2]; + rcode = highlevel_read(host, source, &buffer, addr, 4, flags); + if (rcode < 0) + return; + + packet = create_reply_packet(host, data, 0); + if (packet) { + fill_async_readquad_resp(packet, rcode, buffer); + send_packet_nocare(packet); + } + return; + + case TCODE_READB: + length = data[3] >> 16; + packet = create_reply_packet(host, data, length); + if (!packet) + return; + + addr = (((u64)(data[1] & 0xffff)) << 32) | data[2]; + rcode = highlevel_read(host, source, packet->data, addr, + length, flags); + if (rcode < 0) { + hpsb_free_packet(packet); + return; + } + fill_async_readblock_resp(packet, rcode, length); + send_packet_nocare(packet); + return; + + case TCODE_LOCK_REQUEST: + length = data[3] >> 16; + extcode = data[3] & 0xffff; + addr = (((u64)(data[1] & 0xffff)) << 32) | data[2]; + + packet = create_reply_packet(host, data, 8); + if (!packet) + return; + + if (extcode == 0 || extcode >= 7) { + /* let switch default handle error */ + length = 0; + } + + switch (length) { + case 4: + rcode = highlevel_lock(host, source, packet->data, addr, + data[4], 0, extcode, flags); + fill_async_lock_resp(packet, rcode, extcode, 4); + break; + case 8: + if (extcode != EXTCODE_FETCH_ADD && + extcode != EXTCODE_LITTLE_ADD) { + rcode = highlevel_lock(host, source, + packet->data, addr, + data[5], data[4], + extcode, flags); + fill_async_lock_resp(packet, rcode, extcode, 4); + } else { + rcode = highlevel_lock64(host, source, + (octlet_t *)packet->data, addr, + *(octlet_t *)(data + 4), 0ULL, + extcode, flags); + fill_async_lock_resp(packet, rcode, extcode, 8); + } + break; + case 16: + rcode = highlevel_lock64(host, source, + (octlet_t *)packet->data, addr, + *(octlet_t *)(data + 6), + *(octlet_t *)(data + 4), + extcode, flags); + fill_async_lock_resp(packet, rcode, extcode, 8); + break; + default: + rcode = RCODE_TYPE_ERROR; + fill_async_lock_resp(packet, rcode, extcode, 0); + } + + if (rcode < 0) + hpsb_free_packet(packet); + else + send_packet_nocare(packet); + return; + } +} + +/** + * hpsb_packet_received - hand over received packet to the core + * + * For host driver module usage. + * + * The contents of data are expected to be the full packet but with the CRCs + * left out (data block follows header immediately), with the header (i.e. the + * first four quadlets) in machine byte order and the data block in big endian. + * *@data can be safely overwritten after this call. + * + * If the packet is a write request, @write_acked is to be set to true if it was + * ack_complete'd already, false otherwise. This argument is ignored for any + * other packet type. + */ +void hpsb_packet_received(struct hpsb_host *host, quadlet_t *data, size_t size, + int write_acked) +{ + int tcode; + + if (unlikely(host->in_bus_reset)) { + HPSB_DEBUG("received packet during reset; ignoring"); + return; + } + + dump_packet("received packet", data, size, -1); + + tcode = (data[0] >> 4) & 0xf; + + switch (tcode) { + case TCODE_WRITE_RESPONSE: + case TCODE_READQ_RESPONSE: + case TCODE_READB_RESPONSE: + case TCODE_LOCK_RESPONSE: + handle_packet_response(host, tcode, data, size); + break; + + case TCODE_WRITEQ: + case TCODE_WRITEB: + case TCODE_READQ: + case TCODE_READB: + case TCODE_LOCK_REQUEST: + handle_incoming_packet(host, tcode, data, size, write_acked); + break; + + case TCODE_CYCLE_START: + /* simply ignore this packet if it is passed on */ + break; + + default: + HPSB_DEBUG("received packet with bogus transaction code %d", + tcode); + break; + } +} + +static void abort_requests(struct hpsb_host *host) +{ + struct hpsb_packet *packet, *p; + struct list_head tmp; + unsigned long flags; + + host->driver->devctl(host, CANCEL_REQUESTS, 0); + + INIT_LIST_HEAD(&tmp); + spin_lock_irqsave(&pending_packets_lock, flags); + list_splice_init(&host->pending_packets, &tmp); + spin_unlock_irqrestore(&pending_packets_lock, flags); + + list_for_each_entry_safe(packet, p, &tmp, queue) { + list_del_init(&packet->queue); + packet->state = hpsb_complete; + packet->ack_code = ACKX_ABORTED; + queue_packet_complete(packet); + } +} + +void abort_timedouts(unsigned long __opaque) +{ + struct hpsb_host *host = (struct hpsb_host *)__opaque; + struct hpsb_packet *packet, *p; + struct list_head tmp; + unsigned long flags, expire, j; + + spin_lock_irqsave(&host->csr.lock, flags); + expire = host->csr.expire; + spin_unlock_irqrestore(&host->csr.lock, flags); + + j = jiffies; + INIT_LIST_HEAD(&tmp); + spin_lock_irqsave(&pending_packets_lock, flags); + + list_for_each_entry_safe(packet, p, &host->pending_packets, queue) { + if (time_before(packet->sendtime + expire, j)) + list_move_tail(&packet->queue, &tmp); + else + /* Since packets are added to the tail, the oldest + * ones are first, always. When we get to one that + * isn't timed out, the rest aren't either. */ + break; + } + if (!list_empty(&host->pending_packets)) + mod_timer(&host->timeout, j + host->timeout_interval); + + spin_unlock_irqrestore(&pending_packets_lock, flags); + + list_for_each_entry_safe(packet, p, &tmp, queue) { + list_del_init(&packet->queue); + packet->state = hpsb_complete; + packet->ack_code = ACKX_TIMEOUT; + queue_packet_complete(packet); + } +} + +static struct task_struct *khpsbpkt_thread; +static LIST_HEAD(hpsbpkt_queue); + +static void queue_packet_complete(struct hpsb_packet *packet) +{ + unsigned long flags; + + if (packet->no_waiter) { + hpsb_free_packet(packet); + return; + } + if (packet->complete_routine != NULL) { + spin_lock_irqsave(&pending_packets_lock, flags); + list_add_tail(&packet->queue, &hpsbpkt_queue); + spin_unlock_irqrestore(&pending_packets_lock, flags); + wake_up_process(khpsbpkt_thread); + } + return; +} + +/* + * Kernel thread which handles packets that are completed. This way the + * packet's "complete" function is asynchronously run in process context. + * Only packets which have a "complete" function may be sent here. + */ +static int hpsbpkt_thread(void *__hi) +{ + struct hpsb_packet *packet, *p; + struct list_head tmp; + int may_schedule; + + while (!kthread_should_stop()) { + + INIT_LIST_HEAD(&tmp); + spin_lock_irq(&pending_packets_lock); + list_splice_init(&hpsbpkt_queue, &tmp); + spin_unlock_irq(&pending_packets_lock); + + list_for_each_entry_safe(packet, p, &tmp, queue) { + list_del_init(&packet->queue); + packet->complete_routine(packet->complete_data); + } + + set_current_state(TASK_INTERRUPTIBLE); + spin_lock_irq(&pending_packets_lock); + may_schedule = list_empty(&hpsbpkt_queue); + spin_unlock_irq(&pending_packets_lock); + if (may_schedule) + schedule(); + __set_current_state(TASK_RUNNING); + } + return 0; +} + +static int __init ieee1394_init(void) +{ + int i, ret; + + /* non-fatal error */ + if (hpsb_init_config_roms()) { + HPSB_ERR("Failed to initialize some config rom entries.\n"); + HPSB_ERR("Some features may not be available\n"); + } + + khpsbpkt_thread = kthread_run(hpsbpkt_thread, NULL, "khpsbpkt"); + if (IS_ERR(khpsbpkt_thread)) { + HPSB_ERR("Failed to start hpsbpkt thread!\n"); + ret = PTR_ERR(khpsbpkt_thread); + goto exit_cleanup_config_roms; + } + + if (register_chrdev_region(IEEE1394_CORE_DEV, 256, "ieee1394")) { + HPSB_ERR("unable to register character device major %d!\n", IEEE1394_MAJOR); + ret = -ENODEV; + goto exit_release_kernel_thread; + } + + ret = bus_register(&ieee1394_bus_type); + if (ret < 0) { + HPSB_INFO("bus register failed"); + goto release_chrdev; + } + + for (i = 0; fw_bus_attrs[i]; i++) { + ret = bus_create_file(&ieee1394_bus_type, fw_bus_attrs[i]); + if (ret < 0) { + while (i >= 0) { + bus_remove_file(&ieee1394_bus_type, + fw_bus_attrs[i--]); + } + bus_unregister(&ieee1394_bus_type); + goto release_chrdev; + } + } + + ret = class_register(&hpsb_host_class); + if (ret < 0) + goto release_all_bus; + + hpsb_protocol_class = class_create(THIS_MODULE, "ieee1394_protocol"); + if (IS_ERR(hpsb_protocol_class)) { + ret = PTR_ERR(hpsb_protocol_class); + goto release_class_host; + } + + ret = init_csr(); + if (ret) { + HPSB_INFO("init csr failed"); + ret = -ENOMEM; + goto release_class_protocol; + } + + if (disable_nodemgr) { + HPSB_INFO("nodemgr and IRM functionality disabled"); + /* We shouldn't contend for IRM with nodemgr disabled, since + nodemgr implements functionality required of ieee1394a-2000 + IRMs */ + hpsb_disable_irm = 1; + + return 0; + } + + if (hpsb_disable_irm) { + HPSB_INFO("IRM functionality disabled"); + } + + ret = init_ieee1394_nodemgr(); + if (ret < 0) { + HPSB_INFO("init nodemgr failed"); + goto cleanup_csr; + } + + return 0; + +cleanup_csr: + cleanup_csr(); +release_class_protocol: + class_destroy(hpsb_protocol_class); +release_class_host: + class_unregister(&hpsb_host_class); +release_all_bus: + for (i = 0; fw_bus_attrs[i]; i++) + bus_remove_file(&ieee1394_bus_type, fw_bus_attrs[i]); + bus_unregister(&ieee1394_bus_type); +release_chrdev: + unregister_chrdev_region(IEEE1394_CORE_DEV, 256); +exit_release_kernel_thread: + kthread_stop(khpsbpkt_thread); +exit_cleanup_config_roms: + hpsb_cleanup_config_roms(); + return ret; +} + +static void __exit ieee1394_cleanup(void) +{ + int i; + + if (!disable_nodemgr) + cleanup_ieee1394_nodemgr(); + + cleanup_csr(); + + class_destroy(hpsb_protocol_class); + class_unregister(&hpsb_host_class); + for (i = 0; fw_bus_attrs[i]; i++) + bus_remove_file(&ieee1394_bus_type, fw_bus_attrs[i]); + bus_unregister(&ieee1394_bus_type); + + kthread_stop(khpsbpkt_thread); + + hpsb_cleanup_config_roms(); + + unregister_chrdev_region(IEEE1394_CORE_DEV, 256); +} + +module_init(ieee1394_init); +module_exit(ieee1394_cleanup); + +/* Exported symbols */ + +/** hosts.c **/ +EXPORT_SYMBOL(hpsb_alloc_host); +EXPORT_SYMBOL(hpsb_add_host); +EXPORT_SYMBOL(hpsb_resume_host); +EXPORT_SYMBOL(hpsb_remove_host); +EXPORT_SYMBOL(hpsb_update_config_rom_image); + +/** ieee1394_core.c **/ +EXPORT_SYMBOL(hpsb_speedto_str); +EXPORT_SYMBOL(hpsb_protocol_class); +EXPORT_SYMBOL(hpsb_set_packet_complete_task); +EXPORT_SYMBOL(hpsb_alloc_packet); +EXPORT_SYMBOL(hpsb_free_packet); +EXPORT_SYMBOL(hpsb_send_packet); +EXPORT_SYMBOL(hpsb_reset_bus); +EXPORT_SYMBOL(hpsb_read_cycle_timer); +EXPORT_SYMBOL(hpsb_bus_reset); +EXPORT_SYMBOL(hpsb_selfid_received); +EXPORT_SYMBOL(hpsb_selfid_complete); +EXPORT_SYMBOL(hpsb_packet_sent); +EXPORT_SYMBOL(hpsb_packet_received); +EXPORT_SYMBOL_GPL(hpsb_disable_irm); + +/** ieee1394_transactions.c **/ +EXPORT_SYMBOL(hpsb_get_tlabel); +EXPORT_SYMBOL(hpsb_free_tlabel); +EXPORT_SYMBOL(hpsb_make_readpacket); +EXPORT_SYMBOL(hpsb_make_writepacket); +EXPORT_SYMBOL(hpsb_make_streampacket); +EXPORT_SYMBOL(hpsb_make_lockpacket); +EXPORT_SYMBOL(hpsb_make_lock64packet); +EXPORT_SYMBOL(hpsb_make_phypacket); +EXPORT_SYMBOL(hpsb_read); +EXPORT_SYMBOL(hpsb_write); +EXPORT_SYMBOL(hpsb_packet_success); + +/** highlevel.c **/ +EXPORT_SYMBOL(hpsb_register_highlevel); +EXPORT_SYMBOL(hpsb_unregister_highlevel); +EXPORT_SYMBOL(hpsb_register_addrspace); +EXPORT_SYMBOL(hpsb_unregister_addrspace); +EXPORT_SYMBOL(hpsb_allocate_and_register_addrspace); +EXPORT_SYMBOL(hpsb_get_hostinfo); +EXPORT_SYMBOL(hpsb_create_hostinfo); +EXPORT_SYMBOL(hpsb_destroy_hostinfo); +EXPORT_SYMBOL(hpsb_set_hostinfo_key); +EXPORT_SYMBOL(hpsb_get_hostinfo_bykey); +EXPORT_SYMBOL(hpsb_set_hostinfo); + +/** nodemgr.c **/ +EXPORT_SYMBOL(hpsb_node_fill_packet); +EXPORT_SYMBOL(hpsb_node_write); +EXPORT_SYMBOL(__hpsb_register_protocol); +EXPORT_SYMBOL(hpsb_unregister_protocol); + +/** csr.c **/ +EXPORT_SYMBOL(hpsb_update_config_rom); + +/** dma.c **/ +EXPORT_SYMBOL(dma_prog_region_init); +EXPORT_SYMBOL(dma_prog_region_alloc); +EXPORT_SYMBOL(dma_prog_region_free); +EXPORT_SYMBOL(dma_region_init); +EXPORT_SYMBOL(dma_region_alloc); +EXPORT_SYMBOL(dma_region_free); +EXPORT_SYMBOL(dma_region_sync_for_cpu); +EXPORT_SYMBOL(dma_region_sync_for_device); +EXPORT_SYMBOL(dma_region_mmap); +EXPORT_SYMBOL(dma_region_offset_to_bus); + +/** iso.c **/ +EXPORT_SYMBOL(hpsb_iso_xmit_init); +EXPORT_SYMBOL(hpsb_iso_recv_init); +EXPORT_SYMBOL(hpsb_iso_xmit_start); +EXPORT_SYMBOL(hpsb_iso_recv_start); +EXPORT_SYMBOL(hpsb_iso_recv_listen_channel); +EXPORT_SYMBOL(hpsb_iso_recv_unlisten_channel); +EXPORT_SYMBOL(hpsb_iso_recv_set_channel_mask); +EXPORT_SYMBOL(hpsb_iso_stop); +EXPORT_SYMBOL(hpsb_iso_shutdown); +EXPORT_SYMBOL(hpsb_iso_xmit_queue_packet); +EXPORT_SYMBOL(hpsb_iso_xmit_sync); +EXPORT_SYMBOL(hpsb_iso_recv_release_packets); +EXPORT_SYMBOL(hpsb_iso_n_ready); +EXPORT_SYMBOL(hpsb_iso_packet_sent); +EXPORT_SYMBOL(hpsb_iso_packet_received); +EXPORT_SYMBOL(hpsb_iso_wake); +EXPORT_SYMBOL(hpsb_iso_recv_flush); + +/** csr1212.c **/ +EXPORT_SYMBOL(csr1212_attach_keyval_to_directory); +EXPORT_SYMBOL(csr1212_detach_keyval_from_directory); +EXPORT_SYMBOL(csr1212_get_keyval); +EXPORT_SYMBOL(csr1212_new_directory); +EXPORT_SYMBOL(csr1212_parse_keyval); +EXPORT_SYMBOL(csr1212_read); +EXPORT_SYMBOL(csr1212_release_keyval); |
