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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [ieee1394/] [hosts.c] - Blame information for rev 65

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Line No. Rev Author Line
1 62 marcus.erl
/*
2
 * IEEE 1394 for Linux
3
 *
4
 * Low level (host adapter) management.
5
 *
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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.
11
 */
12
 
13
#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/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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32
 
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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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}
63
 
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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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}
68
 
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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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};
85
 
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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;
89
 
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        if (host->id == *hostnum)
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                return 1;
92
 
93
        return 0;
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}
95
 
96
static DEFINE_MUTEX(host_num_alloc);
97
 
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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)
115
{
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        struct hpsb_host *h;
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        int i;
118
        int hostnum = 0;
119
 
120
        h = kzalloc(sizeof(*h) + extra, GFP_KERNEL);
121
        if (!h)
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                return NULL;
123
 
124
        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;
127
 
128
        h->hostdata = h + 1;
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        h->driver = drv;
130
 
131
        INIT_LIST_HEAD(&h->pending_packets);
132
        INIT_LIST_HEAD(&h->addr_space);
133
 
134
        for (i = 2; i < 16; i++)
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                h->csr.gen_timestamp[i] = jiffies - 60 * HZ;
136
 
137
        atomic_set(&h->generation, 0);
138
 
139
        INIT_DELAYED_WORK(&h->delayed_reset, delayed_reset_bus);
140
 
141
        init_timer(&h->timeout);
142
        h->timeout.data = (unsigned long) h;
143
        h->timeout.function = abort_timedouts;
144
        h->timeout_interval = HZ / 20; /* 50ms, half of minimum SPLIT_TIMEOUT */
145
 
146
        h->topology_map = h->csr.topology_map + 3;
147
        h->speed_map = (u8 *)(h->csr.speed_map + 2);
148
 
149
        mutex_lock(&host_num_alloc);
150
        while (nodemgr_for_each_host(&hostnum, alloc_hostnum_cb))
151
                hostnum++;
152
        mutex_unlock(&host_num_alloc);
153
        h->id = hostnum;
154
 
155
        memcpy(&h->device, &nodemgr_dev_template_host, sizeof(h->device));
156
        h->device.parent = dev;
157
        set_dev_node(&h->device, dev_to_node(dev));
158
        snprintf(h->device.bus_id, BUS_ID_SIZE, "fw-host%d", h->id);
159
 
160
        h->host_dev.parent = &h->device;
161
        h->host_dev.class = &hpsb_host_class;
162
        snprintf(h->host_dev.bus_id, BUS_ID_SIZE, "fw-host%d", h->id);
163
 
164
        if (device_register(&h->device))
165
                goto fail;
166
        if (device_register(&h->host_dev)) {
167
                device_unregister(&h->device);
168
                goto fail;
169
        }
170
        get_device(&h->device);
171
 
172
        return h;
173
 
174
fail:
175
        kfree(h);
176
        return NULL;
177
}
178
 
179
int hpsb_add_host(struct hpsb_host *host)
180
{
181
        if (hpsb_default_host_entry(host))
182
                return -ENOMEM;
183
 
184
        highlevel_add_host(host);
185
        return 0;
186
}
187
 
188
void hpsb_resume_host(struct hpsb_host *host)
189
{
190
        if (host->driver->set_hw_config_rom)
191
                host->driver->set_hw_config_rom(host,
192
                                                host->csr.rom->bus_info_data);
193
        host->driver->devctl(host, RESET_BUS, SHORT_RESET);
194
}
195
 
196
void hpsb_remove_host(struct hpsb_host *host)
197
{
198
        host->is_shutdown = 1;
199
 
200
        cancel_delayed_work(&host->delayed_reset);
201
        flush_scheduled_work();
202
 
203
        host->driver = &dummy_driver;
204
        highlevel_remove_host(host);
205
 
206
        device_unregister(&host->host_dev);
207
        device_unregister(&host->device);
208
}
209
 
210
/**
211
 * hpsb_update_config_rom_image - updates configuration ROM image of a host
212
 *
213
 * Updates the configuration ROM image of a host.  rom_version must be the
214
 * current version, otherwise it will fail with return value -1. If this
215
 * host does not support config-rom-update, it will return -%EINVAL.
216
 * Return value 0 indicates success.
217
 */
218
int hpsb_update_config_rom_image(struct hpsb_host *host)
219
{
220
        unsigned long reset_delay;
221
        int next_gen = host->csr.generation + 1;
222
 
223
        if (!host->update_config_rom)
224
                return -EINVAL;
225
 
226
        if (next_gen > 0xf)
227
                next_gen = 2;
228
 
229
        /* Stop the delayed interrupt, we're about to change the config rom and
230
         * it would be a waste to do a bus reset twice. */
231
        cancel_delayed_work(&host->delayed_reset);
232
 
233
        /* IEEE 1394a-2000 prohibits using the same generation number
234
         * twice in a 60 second period. */
235
        if (time_before(jiffies, host->csr.gen_timestamp[next_gen] + 60 * HZ))
236
                /* Wait 60 seconds from the last time this generation number was
237
                 * used. */
238
                reset_delay =
239
                        (60 * HZ) + host->csr.gen_timestamp[next_gen] - jiffies;
240
        else
241
                /* Wait 1 second in case some other code wants to change the
242
                 * Config ROM in the near future. */
243
                reset_delay = HZ;
244
 
245
        PREPARE_DELAYED_WORK(&host->delayed_reset, delayed_reset_bus);
246
        schedule_delayed_work(&host->delayed_reset, reset_delay);
247
 
248
        return 0;
249
}

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