Kristian Høgsberg | c781c06 | 2007-05-07 20:33:32 -0400 | [diff] [blame] | 1 | /* |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 2 | * Isochronous I/O functionality: |
| 3 | * - Isochronous DMA context management |
| 4 | * - Isochronous bus resource management (channels, bandwidth), client side |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 5 | * |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 6 | * Copyright (C) 2006 Kristian Hoegsberg <krh@bitplanet.net> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software Foundation, |
| 20 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 21 | */ |
| 22 | |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 23 | #include <linux/dma-mapping.h> |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 24 | #include <linux/errno.h> |
Stefan Richter | 77c9a5d | 2009-06-05 16:26:18 +0200 | [diff] [blame] | 25 | #include <linux/firewire.h> |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 26 | #include <linux/firewire-constants.h> |
| 27 | #include <linux/kernel.h> |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 28 | #include <linux/mm.h> |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 29 | #include <linux/spinlock.h> |
| 30 | #include <linux/vmalloc.h> |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 31 | |
Stefan Richter | e8ca970 | 2009-06-04 21:09:38 +0200 | [diff] [blame] | 32 | #include <asm/byteorder.h> |
| 33 | |
Stefan Richter | 77c9a5d | 2009-06-05 16:26:18 +0200 | [diff] [blame] | 34 | #include "core.h" |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 35 | |
| 36 | /* |
| 37 | * Isochronous DMA context management |
| 38 | */ |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 39 | |
Stefan Richter | 53dca51 | 2008-12-14 21:47:04 +0100 | [diff] [blame] | 40 | int fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card, |
| 41 | int page_count, enum dma_data_direction direction) |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 42 | { |
Stefan Richter | 2dbd7d7 | 2008-12-14 21:45:45 +0100 | [diff] [blame] | 43 | int i, j; |
Kristian Høgsberg | 9aad812 | 2007-02-16 17:34:38 -0500 | [diff] [blame] | 44 | dma_addr_t address; |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 45 | |
Kristian Høgsberg | 9aad812 | 2007-02-16 17:34:38 -0500 | [diff] [blame] | 46 | buffer->page_count = page_count; |
| 47 | buffer->direction = direction; |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 48 | |
Kristian Høgsberg | 9aad812 | 2007-02-16 17:34:38 -0500 | [diff] [blame] | 49 | buffer->pages = kmalloc(page_count * sizeof(buffer->pages[0]), |
| 50 | GFP_KERNEL); |
| 51 | if (buffer->pages == NULL) |
| 52 | goto out; |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 53 | |
Kristian Høgsberg | 9aad812 | 2007-02-16 17:34:38 -0500 | [diff] [blame] | 54 | for (i = 0; i < buffer->page_count; i++) { |
Kristian Høgsberg | 68be3fa | 2007-02-16 17:34:48 -0500 | [diff] [blame] | 55 | buffer->pages[i] = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO); |
Kristian Høgsberg | 9aad812 | 2007-02-16 17:34:38 -0500 | [diff] [blame] | 56 | if (buffer->pages[i] == NULL) |
| 57 | goto out_pages; |
Stefan Richter | 373b2ed | 2007-03-04 14:45:18 +0100 | [diff] [blame] | 58 | |
Kristian Høgsberg | 9aad812 | 2007-02-16 17:34:38 -0500 | [diff] [blame] | 59 | address = dma_map_page(card->device, buffer->pages[i], |
| 60 | 0, PAGE_SIZE, direction); |
FUJITA Tomonori | 8d8bb39 | 2008-07-25 19:44:49 -0700 | [diff] [blame] | 61 | if (dma_mapping_error(card->device, address)) { |
Kristian Høgsberg | 9aad812 | 2007-02-16 17:34:38 -0500 | [diff] [blame] | 62 | __free_page(buffer->pages[i]); |
| 63 | goto out_pages; |
| 64 | } |
| 65 | set_page_private(buffer->pages[i], address); |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 66 | } |
| 67 | |
| 68 | return 0; |
Kristian Høgsberg | 82eff9d | 2007-02-06 14:49:40 -0500 | [diff] [blame] | 69 | |
Kristian Høgsberg | 9aad812 | 2007-02-16 17:34:38 -0500 | [diff] [blame] | 70 | out_pages: |
| 71 | for (j = 0; j < i; j++) { |
| 72 | address = page_private(buffer->pages[j]); |
| 73 | dma_unmap_page(card->device, address, |
Stefan Richter | 29ad14c | 2009-06-15 00:38:50 +0200 | [diff] [blame] | 74 | PAGE_SIZE, direction); |
Kristian Høgsberg | 9aad812 | 2007-02-16 17:34:38 -0500 | [diff] [blame] | 75 | __free_page(buffer->pages[j]); |
| 76 | } |
| 77 | kfree(buffer->pages); |
| 78 | out: |
| 79 | buffer->pages = NULL; |
Stefan Richter | e1eff7a | 2009-02-03 17:55:19 +0100 | [diff] [blame] | 80 | |
Stefan Richter | 2dbd7d7 | 2008-12-14 21:45:45 +0100 | [diff] [blame] | 81 | return -ENOMEM; |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 82 | } |
Jay Fenlason | c76acec | 2009-05-18 13:08:06 -0400 | [diff] [blame] | 83 | EXPORT_SYMBOL(fw_iso_buffer_init); |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 84 | |
Kristian Høgsberg | 9aad812 | 2007-02-16 17:34:38 -0500 | [diff] [blame] | 85 | int fw_iso_buffer_map(struct fw_iso_buffer *buffer, struct vm_area_struct *vma) |
| 86 | { |
| 87 | unsigned long uaddr; |
Stefan Richter | e1eff7a | 2009-02-03 17:55:19 +0100 | [diff] [blame] | 88 | int i, err; |
Kristian Høgsberg | 9aad812 | 2007-02-16 17:34:38 -0500 | [diff] [blame] | 89 | |
| 90 | uaddr = vma->vm_start; |
| 91 | for (i = 0; i < buffer->page_count; i++) { |
Stefan Richter | e1eff7a | 2009-02-03 17:55:19 +0100 | [diff] [blame] | 92 | err = vm_insert_page(vma, uaddr, buffer->pages[i]); |
| 93 | if (err) |
| 94 | return err; |
| 95 | |
Kristian Høgsberg | 9aad812 | 2007-02-16 17:34:38 -0500 | [diff] [blame] | 96 | uaddr += PAGE_SIZE; |
| 97 | } |
| 98 | |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer, |
| 103 | struct fw_card *card) |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 104 | { |
| 105 | int i; |
Kristian Høgsberg | 9aad812 | 2007-02-16 17:34:38 -0500 | [diff] [blame] | 106 | dma_addr_t address; |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 107 | |
Kristian Høgsberg | 9aad812 | 2007-02-16 17:34:38 -0500 | [diff] [blame] | 108 | for (i = 0; i < buffer->page_count; i++) { |
| 109 | address = page_private(buffer->pages[i]); |
| 110 | dma_unmap_page(card->device, address, |
Stefan Richter | 29ad14c | 2009-06-15 00:38:50 +0200 | [diff] [blame] | 111 | PAGE_SIZE, buffer->direction); |
Kristian Høgsberg | 9aad812 | 2007-02-16 17:34:38 -0500 | [diff] [blame] | 112 | __free_page(buffer->pages[i]); |
| 113 | } |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 114 | |
Kristian Høgsberg | 9aad812 | 2007-02-16 17:34:38 -0500 | [diff] [blame] | 115 | kfree(buffer->pages); |
| 116 | buffer->pages = NULL; |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 117 | } |
Jay Fenlason | c76acec | 2009-05-18 13:08:06 -0400 | [diff] [blame] | 118 | EXPORT_SYMBOL(fw_iso_buffer_destroy); |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 119 | |
Stefan Richter | 53dca51 | 2008-12-14 21:47:04 +0100 | [diff] [blame] | 120 | struct fw_iso_context *fw_iso_context_create(struct fw_card *card, |
| 121 | int type, int channel, int speed, size_t header_size, |
| 122 | fw_iso_callback_t callback, void *callback_data) |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 123 | { |
| 124 | struct fw_iso_context *ctx; |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 125 | |
Stefan Richter | 4817ed2 | 2008-12-21 16:39:46 +0100 | [diff] [blame] | 126 | ctx = card->driver->allocate_iso_context(card, |
| 127 | type, channel, header_size); |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 128 | if (IS_ERR(ctx)) |
| 129 | return ctx; |
| 130 | |
| 131 | ctx->card = card; |
| 132 | ctx->type = type; |
Kristian Høgsberg | 21efb3c | 2007-02-16 17:34:50 -0500 | [diff] [blame] | 133 | ctx->channel = channel; |
| 134 | ctx->speed = speed; |
Kristian Høgsberg | 295e3fe | 2007-02-16 17:34:40 -0500 | [diff] [blame] | 135 | ctx->header_size = header_size; |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 136 | ctx->callback = callback; |
| 137 | ctx->callback_data = callback_data; |
| 138 | |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 139 | return ctx; |
| 140 | } |
Jay Fenlason | c76acec | 2009-05-18 13:08:06 -0400 | [diff] [blame] | 141 | EXPORT_SYMBOL(fw_iso_context_create); |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 142 | |
| 143 | void fw_iso_context_destroy(struct fw_iso_context *ctx) |
| 144 | { |
| 145 | struct fw_card *card = ctx->card; |
| 146 | |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 147 | card->driver->free_iso_context(ctx); |
| 148 | } |
Jay Fenlason | c76acec | 2009-05-18 13:08:06 -0400 | [diff] [blame] | 149 | EXPORT_SYMBOL(fw_iso_context_destroy); |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 150 | |
Stefan Richter | 53dca51 | 2008-12-14 21:47:04 +0100 | [diff] [blame] | 151 | int fw_iso_context_start(struct fw_iso_context *ctx, |
| 152 | int cycle, int sync, int tags) |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 153 | { |
Kristian Høgsberg | eb0306e | 2007-03-14 17:34:54 -0400 | [diff] [blame] | 154 | return ctx->card->driver->start_iso(ctx, cycle, sync, tags); |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 155 | } |
Jay Fenlason | c76acec | 2009-05-18 13:08:06 -0400 | [diff] [blame] | 156 | EXPORT_SYMBOL(fw_iso_context_start); |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 157 | |
Stefan Richter | 53dca51 | 2008-12-14 21:47:04 +0100 | [diff] [blame] | 158 | int fw_iso_context_queue(struct fw_iso_context *ctx, |
| 159 | struct fw_iso_packet *packet, |
| 160 | struct fw_iso_buffer *buffer, |
| 161 | unsigned long payload) |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 162 | { |
| 163 | struct fw_card *card = ctx->card; |
| 164 | |
Kristian Høgsberg | 9aad812 | 2007-02-16 17:34:38 -0500 | [diff] [blame] | 165 | return card->driver->queue_iso(ctx, packet, buffer, payload); |
Kristian Høgsberg | 3038e35 | 2006-12-19 19:58:27 -0500 | [diff] [blame] | 166 | } |
Jay Fenlason | c76acec | 2009-05-18 13:08:06 -0400 | [diff] [blame] | 167 | EXPORT_SYMBOL(fw_iso_context_queue); |
Kristian Høgsberg | b829566 | 2007-02-16 17:34:42 -0500 | [diff] [blame] | 168 | |
Stefan Richter | 53dca51 | 2008-12-14 21:47:04 +0100 | [diff] [blame] | 169 | int fw_iso_context_stop(struct fw_iso_context *ctx) |
Kristian Høgsberg | b829566 | 2007-02-16 17:34:42 -0500 | [diff] [blame] | 170 | { |
| 171 | return ctx->card->driver->stop_iso(ctx); |
| 172 | } |
Jay Fenlason | c76acec | 2009-05-18 13:08:06 -0400 | [diff] [blame] | 173 | EXPORT_SYMBOL(fw_iso_context_stop); |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 174 | |
| 175 | /* |
| 176 | * Isochronous bus resource management (channels, bandwidth), client side |
| 177 | */ |
| 178 | |
| 179 | static int manage_bandwidth(struct fw_card *card, int irm_id, int generation, |
Stefan Richter | 6fdc037 | 2009-06-20 13:23:59 +0200 | [diff] [blame] | 180 | int bandwidth, bool allocate, __be32 data[2]) |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 181 | { |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 182 | int try, new, old = allocate ? BANDWIDTH_AVAILABLE_INITIAL : 0; |
| 183 | |
| 184 | /* |
| 185 | * On a 1394a IRM with low contention, try < 1 is enough. |
| 186 | * On a 1394-1995 IRM, we need at least try < 2. |
| 187 | * Let's just do try < 5. |
| 188 | */ |
| 189 | for (try = 0; try < 5; try++) { |
| 190 | new = allocate ? old - bandwidth : old + bandwidth; |
| 191 | if (new < 0 || new > BANDWIDTH_AVAILABLE_INITIAL) |
| 192 | break; |
| 193 | |
| 194 | data[0] = cpu_to_be32(old); |
| 195 | data[1] = cpu_to_be32(new); |
| 196 | switch (fw_run_transaction(card, TCODE_LOCK_COMPARE_SWAP, |
| 197 | irm_id, generation, SCODE_100, |
| 198 | CSR_REGISTER_BASE + CSR_BANDWIDTH_AVAILABLE, |
Stefan Richter | 1821bc1 | 2009-09-05 13:23:49 +0200 | [diff] [blame^] | 199 | data, 8)) { |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 200 | case RCODE_GENERATION: |
| 201 | /* A generation change frees all bandwidth. */ |
| 202 | return allocate ? -EAGAIN : bandwidth; |
| 203 | |
| 204 | case RCODE_COMPLETE: |
| 205 | if (be32_to_cpup(data) == old) |
| 206 | return bandwidth; |
| 207 | |
| 208 | old = be32_to_cpup(data); |
| 209 | /* Fall through. */ |
| 210 | } |
| 211 | } |
| 212 | |
| 213 | return -EIO; |
| 214 | } |
| 215 | |
| 216 | static int manage_channel(struct fw_card *card, int irm_id, int generation, |
Stefan Richter | 6fdc037 | 2009-06-20 13:23:59 +0200 | [diff] [blame] | 217 | u32 channels_mask, u64 offset, bool allocate, __be32 data[2]) |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 218 | { |
Stefan Richter | 6fdc037 | 2009-06-20 13:23:59 +0200 | [diff] [blame] | 219 | __be32 c, all, old; |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 220 | int i, retry = 5; |
| 221 | |
Stefan Richter | 5d9cb7d | 2009-01-08 23:07:40 +0100 | [diff] [blame] | 222 | old = all = allocate ? cpu_to_be32(~0) : 0; |
| 223 | |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 224 | for (i = 0; i < 32; i++) { |
Stefan Richter | 5d9cb7d | 2009-01-08 23:07:40 +0100 | [diff] [blame] | 225 | if (!(channels_mask & 1 << i)) |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 226 | continue; |
| 227 | |
Stefan Richter | 5d9cb7d | 2009-01-08 23:07:40 +0100 | [diff] [blame] | 228 | c = cpu_to_be32(1 << (31 - i)); |
| 229 | if ((old & c) != (all & c)) |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 230 | continue; |
| 231 | |
| 232 | data[0] = old; |
| 233 | data[1] = old ^ c; |
| 234 | switch (fw_run_transaction(card, TCODE_LOCK_COMPARE_SWAP, |
| 235 | irm_id, generation, SCODE_100, |
Stefan Richter | 1821bc1 | 2009-09-05 13:23:49 +0200 | [diff] [blame^] | 236 | offset, data, 8)) { |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 237 | case RCODE_GENERATION: |
| 238 | /* A generation change frees all channels. */ |
| 239 | return allocate ? -EAGAIN : i; |
| 240 | |
| 241 | case RCODE_COMPLETE: |
| 242 | if (data[0] == old) |
| 243 | return i; |
| 244 | |
| 245 | old = data[0]; |
| 246 | |
| 247 | /* Is the IRM 1394a-2000 compliant? */ |
Stefan Richter | 5d9cb7d | 2009-01-08 23:07:40 +0100 | [diff] [blame] | 248 | if ((data[0] & c) == (data[1] & c)) |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 249 | continue; |
| 250 | |
| 251 | /* 1394-1995 IRM, fall through to retry. */ |
| 252 | default: |
| 253 | if (retry--) |
| 254 | i--; |
| 255 | } |
| 256 | } |
| 257 | |
| 258 | return -EIO; |
| 259 | } |
| 260 | |
| 261 | static void deallocate_channel(struct fw_card *card, int irm_id, |
Stefan Richter | 6fdc037 | 2009-06-20 13:23:59 +0200 | [diff] [blame] | 262 | int generation, int channel, __be32 buffer[2]) |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 263 | { |
Stefan Richter | 5d9cb7d | 2009-01-08 23:07:40 +0100 | [diff] [blame] | 264 | u32 mask; |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 265 | u64 offset; |
| 266 | |
Stefan Richter | 5d9cb7d | 2009-01-08 23:07:40 +0100 | [diff] [blame] | 267 | mask = channel < 32 ? 1 << channel : 1 << (channel - 32); |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 268 | offset = channel < 32 ? CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_HI : |
| 269 | CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_LO; |
| 270 | |
Stefan Richter | 6fdc037 | 2009-06-20 13:23:59 +0200 | [diff] [blame] | 271 | manage_channel(card, irm_id, generation, mask, offset, false, buffer); |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 272 | } |
| 273 | |
| 274 | /** |
| 275 | * fw_iso_resource_manage - Allocate or deallocate a channel and/or bandwidth |
| 276 | * |
| 277 | * In parameters: card, generation, channels_mask, bandwidth, allocate |
| 278 | * Out parameters: channel, bandwidth |
| 279 | * This function blocks (sleeps) during communication with the IRM. |
Stefan Richter | 5d9cb7d | 2009-01-08 23:07:40 +0100 | [diff] [blame] | 280 | * |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 281 | * Allocates or deallocates at most one channel out of channels_mask. |
Stefan Richter | 5d9cb7d | 2009-01-08 23:07:40 +0100 | [diff] [blame] | 282 | * channels_mask is a bitfield with MSB for channel 63 and LSB for channel 0. |
| 283 | * (Note, the IRM's CHANNELS_AVAILABLE is a big-endian bitfield with MSB for |
| 284 | * channel 0 and LSB for channel 63.) |
| 285 | * Allocates or deallocates as many bandwidth allocation units as specified. |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 286 | * |
| 287 | * Returns channel < 0 if no channel was allocated or deallocated. |
| 288 | * Returns bandwidth = 0 if no bandwidth was allocated or deallocated. |
| 289 | * |
| 290 | * If generation is stale, deallocations succeed but allocations fail with |
| 291 | * channel = -EAGAIN. |
| 292 | * |
Stefan Richter | 5d9cb7d | 2009-01-08 23:07:40 +0100 | [diff] [blame] | 293 | * If channel allocation fails, no bandwidth will be allocated either. |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 294 | * If bandwidth allocation fails, no channel will be allocated either. |
Stefan Richter | 5d9cb7d | 2009-01-08 23:07:40 +0100 | [diff] [blame] | 295 | * But deallocations of channel and bandwidth are tried independently |
| 296 | * of each other's success. |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 297 | */ |
| 298 | void fw_iso_resource_manage(struct fw_card *card, int generation, |
| 299 | u64 channels_mask, int *channel, int *bandwidth, |
Stefan Richter | 6fdc037 | 2009-06-20 13:23:59 +0200 | [diff] [blame] | 300 | bool allocate, __be32 buffer[2]) |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 301 | { |
Stefan Richter | 5d9cb7d | 2009-01-08 23:07:40 +0100 | [diff] [blame] | 302 | u32 channels_hi = channels_mask; /* channels 31...0 */ |
| 303 | u32 channels_lo = channels_mask >> 32; /* channels 63...32 */ |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 304 | int irm_id, ret, c = -EINVAL; |
| 305 | |
| 306 | spin_lock_irq(&card->lock); |
| 307 | irm_id = card->irm_node->node_id; |
| 308 | spin_unlock_irq(&card->lock); |
| 309 | |
| 310 | if (channels_hi) |
| 311 | c = manage_channel(card, irm_id, generation, channels_hi, |
Stefan Richter | 6fdc037 | 2009-06-20 13:23:59 +0200 | [diff] [blame] | 312 | CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_HI, |
| 313 | allocate, buffer); |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 314 | if (channels_lo && c < 0) { |
| 315 | c = manage_channel(card, irm_id, generation, channels_lo, |
Stefan Richter | 6fdc037 | 2009-06-20 13:23:59 +0200 | [diff] [blame] | 316 | CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_LO, |
| 317 | allocate, buffer); |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 318 | if (c >= 0) |
| 319 | c += 32; |
| 320 | } |
| 321 | *channel = c; |
| 322 | |
Stefan Richter | 5d9cb7d | 2009-01-08 23:07:40 +0100 | [diff] [blame] | 323 | if (allocate && channels_mask != 0 && c < 0) |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 324 | *bandwidth = 0; |
| 325 | |
| 326 | if (*bandwidth == 0) |
| 327 | return; |
| 328 | |
Stefan Richter | 6fdc037 | 2009-06-20 13:23:59 +0200 | [diff] [blame] | 329 | ret = manage_bandwidth(card, irm_id, generation, *bandwidth, |
| 330 | allocate, buffer); |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 331 | if (ret < 0) |
| 332 | *bandwidth = 0; |
| 333 | |
Stefan Richter | 5d9cb7d | 2009-01-08 23:07:40 +0100 | [diff] [blame] | 334 | if (allocate && ret < 0 && c >= 0) { |
Stefan Richter | 6fdc037 | 2009-06-20 13:23:59 +0200 | [diff] [blame] | 335 | deallocate_channel(card, irm_id, generation, c, buffer); |
Jay Fenlason, Stefan Richter | b1bda4c | 2009-01-04 16:23:29 +0100 | [diff] [blame] | 336 | *channel = ret; |
| 337 | } |
| 338 | } |