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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/ieee1394/hosts.c
downloadop-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip
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Linux-2.6.12-rc2v2.6.12-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!
Diffstat (limited to 'drivers/ieee1394/hosts.c')
-rw-r--r--drivers/ieee1394/hosts.c233
1 files changed, 233 insertions, 0 deletions
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 <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/timer.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(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;
+}
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