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