From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- drivers/ieee1394/hosts.c | 233 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 233 insertions(+) create mode 100644 drivers/ieee1394/hosts.c (limited to 'drivers/ieee1394/hosts.c') diff --git a/drivers/ieee1394/hosts.c b/drivers/ieee1394/hosts.c new file mode 100644 index 0000000..c502c6e --- /dev/null +++ b/drivers/ieee1394/hosts.c @@ -0,0 +1,233 @@ +/* + * 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 +#include +#include +#include +#include +#include +#include +#include + +#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(void * __reset_info) +{ + struct hpsb_host *host = (struct hpsb_host*)__reset_info; + int 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; +} + +/** + * 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 succesful, %NULL if + * no memory was available. + */ +static DECLARE_MUTEX(host_num_alloc); + +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 = kmalloc(sizeof(struct hpsb_host) + extra, SLAB_KERNEL); + if (!h) return NULL; + memset(h, 0, sizeof(struct hpsb_host) + extra); + + h->csr.rom = csr1212_create_csr(&csr_bus_ops, CSR_BUS_INFO_SIZE, h); + if (!h->csr.rom) { + kfree(h); + return NULL; + } + + h->hostdata = h + 1; + h->driver = drv; + + skb_queue_head_init(&h->pending_packet_queue); + INIT_LIST_HEAD(&h->addr_space); + + for (i = 2; i < 16; i++) + h->csr.gen_timestamp[i] = jiffies - 60 * HZ; + + for (i = 0; i < ARRAY_SIZE(h->tpool); i++) + HPSB_TPOOL_INIT(&h->tpool[i]); + + atomic_set(&h->generation, 0); + + INIT_WORK(&h->delayed_reset, delayed_reset_bus, h); + + init_timer(&h->timeout); + h->timeout.data = (unsigned long) h; + h->timeout.function = abort_timedouts; + h->timeout_interval = HZ / 20; // 50ms by default + + h->topology_map = h->csr.topology_map + 3; + h->speed_map = (u8 *)(h->csr.speed_map + 2); + + down(&host_num_alloc); + + while (nodemgr_for_each_host(&hostnum, alloc_hostnum_cb)) + hostnum++; + + h->id = hostnum; + + memcpy(&h->device, &nodemgr_dev_template_host, sizeof(h->device)); + h->device.parent = dev; + snprintf(h->device.bus_id, BUS_ID_SIZE, "fw-host%d", h->id); + + h->class_dev.dev = &h->device; + h->class_dev.class = &hpsb_host_class; + snprintf(h->class_dev.class_id, BUS_ID_SIZE, "fw-host%d", h->id); + + device_register(&h->device); + class_device_register(&h->class_dev); + get_device(&h->device); + + up(&host_num_alloc); + + return h; +} + +int hpsb_add_host(struct hpsb_host *host) +{ + if (hpsb_default_host_entry(host)) + return -ENOMEM; + + hpsb_add_extra_config_roms(host); + + highlevel_add_host(host); + + return 0; +} + +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); + + hpsb_remove_extra_config_roms(host); + + class_device_unregister(&host->class_dev); + device_unregister(&host->device); +} + +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 (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_WORK(&host->delayed_reset, delayed_reset_bus, host); + schedule_delayed_work(&host->delayed_reset, reset_delay); + + return 0; +} -- cgit v1.1