250 lines
6.2 KiB
C
250 lines
6.2 KiB
C
/*
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* IEEE 1394 for Linux
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*
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* Low level (host adapter) management.
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*
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* Copyright (C) 1999 Andreas E. Bombe
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* Copyright (C) 1999 Emanuel Pirker
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*
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* This code is licensed under the GPL. See the file COPYING in the root
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* directory of the kernel sources for details.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/pci.h>
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#include <linux/timer.h>
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#include <linux/jiffies.h>
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#include <linux/mutex.h>
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#include "csr1212.h"
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#include "ieee1394.h"
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#include "ieee1394_types.h"
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#include "hosts.h"
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#include "ieee1394_core.h"
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#include "highlevel.h"
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#include "nodemgr.h"
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#include "csr.h"
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#include "config_roms.h"
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static void delayed_reset_bus(struct work_struct *work)
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{
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struct hpsb_host *host =
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container_of(work, struct hpsb_host, delayed_reset.work);
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int generation = host->csr.generation + 1;
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/* The generation field rolls over to 2 rather than 0 per IEEE
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* 1394a-2000. */
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if (generation > 0xf || generation < 2)
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generation = 2;
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CSR_SET_BUS_INFO_GENERATION(host->csr.rom, generation);
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if (csr1212_generate_csr_image(host->csr.rom) != CSR1212_SUCCESS) {
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/* CSR image creation failed.
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* Reset generation field and do not issue a bus reset. */
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CSR_SET_BUS_INFO_GENERATION(host->csr.rom,
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host->csr.generation);
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return;
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}
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host->csr.generation = generation;
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host->update_config_rom = 0;
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if (host->driver->set_hw_config_rom)
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host->driver->set_hw_config_rom(host,
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host->csr.rom->bus_info_data);
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host->csr.gen_timestamp[host->csr.generation] = jiffies;
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hpsb_reset_bus(host, SHORT_RESET);
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}
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static int dummy_transmit_packet(struct hpsb_host *h, struct hpsb_packet *p)
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{
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return 0;
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}
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static int dummy_devctl(struct hpsb_host *h, enum devctl_cmd c, int arg)
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{
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return -1;
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}
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static int dummy_isoctl(struct hpsb_iso *iso, enum isoctl_cmd command,
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unsigned long arg)
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{
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return -1;
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}
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static struct hpsb_host_driver dummy_driver = {
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.transmit_packet = dummy_transmit_packet,
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.devctl = dummy_devctl,
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.isoctl = dummy_isoctl
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};
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static int alloc_hostnum_cb(struct hpsb_host *host, void *__data)
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{
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int *hostnum = __data;
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if (host->id == *hostnum)
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return 1;
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return 0;
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}
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/*
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* The pending_packet_queue is special in that it's processed
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* from hardirq context too (such as hpsb_bus_reset()). Hence
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* split the lock class from the usual networking skb-head
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* lock class by using a separate key for it:
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*/
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static struct lock_class_key pending_packet_queue_key;
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static DEFINE_MUTEX(host_num_alloc);
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/**
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* hpsb_alloc_host - allocate a new host controller.
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* @drv: the driver that will manage the host controller
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* @extra: number of extra bytes to allocate for the driver
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*
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* Allocate a &hpsb_host and initialize the general subsystem specific
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* fields. If the driver needs to store per host data, as drivers
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* usually do, the amount of memory required can be specified by the
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* @extra parameter. Once allocated, the driver should initialize the
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* driver specific parts, enable the controller and make it available
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* to the general subsystem using hpsb_add_host().
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*
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* Return Value: a pointer to the &hpsb_host if successful, %NULL if
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* no memory was available.
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*/
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struct hpsb_host *hpsb_alloc_host(struct hpsb_host_driver *drv, size_t extra,
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struct device *dev)
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{
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struct hpsb_host *h;
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int i;
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int hostnum = 0;
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h = kzalloc(sizeof(*h) + extra, GFP_KERNEL);
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if (!h)
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return NULL;
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h->csr.rom = csr1212_create_csr(&csr_bus_ops, CSR_BUS_INFO_SIZE, h);
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if (!h->csr.rom)
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goto fail;
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h->hostdata = h + 1;
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h->driver = drv;
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skb_queue_head_init(&h->pending_packet_queue);
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lockdep_set_class(&h->pending_packet_queue.lock,
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&pending_packet_queue_key);
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INIT_LIST_HEAD(&h->addr_space);
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for (i = 2; i < 16; i++)
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h->csr.gen_timestamp[i] = jiffies - 60 * HZ;
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atomic_set(&h->generation, 0);
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INIT_DELAYED_WORK(&h->delayed_reset, delayed_reset_bus);
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init_timer(&h->timeout);
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h->timeout.data = (unsigned long) h;
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h->timeout.function = abort_timedouts;
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h->timeout_interval = HZ / 20; /* 50ms, half of minimum SPLIT_TIMEOUT */
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h->topology_map = h->csr.topology_map + 3;
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h->speed_map = (u8 *)(h->csr.speed_map + 2);
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mutex_lock(&host_num_alloc);
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while (nodemgr_for_each_host(&hostnum, alloc_hostnum_cb))
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hostnum++;
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mutex_unlock(&host_num_alloc);
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h->id = hostnum;
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memcpy(&h->device, &nodemgr_dev_template_host, sizeof(h->device));
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h->device.parent = dev;
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snprintf(h->device.bus_id, BUS_ID_SIZE, "fw-host%d", h->id);
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h->class_dev.dev = &h->device;
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h->class_dev.class = &hpsb_host_class;
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snprintf(h->class_dev.class_id, BUS_ID_SIZE, "fw-host%d", h->id);
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if (device_register(&h->device))
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goto fail;
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if (class_device_register(&h->class_dev)) {
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device_unregister(&h->device);
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goto fail;
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}
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get_device(&h->device);
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return h;
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fail:
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kfree(h);
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return NULL;
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}
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int hpsb_add_host(struct hpsb_host *host)
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{
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if (hpsb_default_host_entry(host))
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return -ENOMEM;
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hpsb_add_extra_config_roms(host);
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highlevel_add_host(host);
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return 0;
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}
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void hpsb_remove_host(struct hpsb_host *host)
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{
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host->is_shutdown = 1;
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cancel_delayed_work(&host->delayed_reset);
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flush_scheduled_work();
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host->driver = &dummy_driver;
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highlevel_remove_host(host);
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hpsb_remove_extra_config_roms(host);
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class_device_unregister(&host->class_dev);
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device_unregister(&host->device);
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}
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int hpsb_update_config_rom_image(struct hpsb_host *host)
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{
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unsigned long reset_delay;
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int next_gen = host->csr.generation + 1;
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if (!host->update_config_rom)
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return -EINVAL;
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if (next_gen > 0xf)
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next_gen = 2;
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/* Stop the delayed interrupt, we're about to change the config rom and
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* it would be a waste to do a bus reset twice. */
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cancel_delayed_work(&host->delayed_reset);
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/* IEEE 1394a-2000 prohibits using the same generation number
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* twice in a 60 second period. */
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if (time_before(jiffies, host->csr.gen_timestamp[next_gen] + 60 * HZ))
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/* Wait 60 seconds from the last time this generation number was
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* used. */
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reset_delay =
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(60 * HZ) + host->csr.gen_timestamp[next_gen] - jiffies;
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else
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/* Wait 1 second in case some other code wants to change the
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* Config ROM in the near future. */
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reset_delay = HZ;
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PREPARE_DELAYED_WORK(&host->delayed_reset, delayed_reset_bus);
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schedule_delayed_work(&host->delayed_reset, reset_delay);
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return 0;
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}
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