Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 1 | /* |
| 2 | * offload engine driver for the Intel Xscale series of i/o processors |
| 3 | * Copyright © 2006, Intel Corporation. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
| 6 | * under the terms and conditions of the GNU General Public License, |
| 7 | * version 2, as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 12 | * more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along with |
| 15 | * this program; if not, write to the Free Software Foundation, Inc., |
| 16 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. |
| 17 | * |
| 18 | */ |
| 19 | |
| 20 | /* |
| 21 | * This driver supports the asynchrounous DMA copy and RAID engines available |
| 22 | * on the Intel Xscale(R) family of I/O Processors (IOP 32x, 33x, 134x) |
| 23 | */ |
| 24 | |
| 25 | #include <linux/init.h> |
| 26 | #include <linux/module.h> |
| 27 | #include <linux/async_tx.h> |
| 28 | #include <linux/delay.h> |
| 29 | #include <linux/dma-mapping.h> |
| 30 | #include <linux/spinlock.h> |
| 31 | #include <linux/interrupt.h> |
| 32 | #include <linux/platform_device.h> |
| 33 | #include <linux/memory.h> |
| 34 | #include <linux/ioport.h> |
| 35 | |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 36 | #include <mach/adma.h> |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 37 | |
| 38 | #define to_iop_adma_chan(chan) container_of(chan, struct iop_adma_chan, common) |
| 39 | #define to_iop_adma_device(dev) \ |
| 40 | container_of(dev, struct iop_adma_device, common) |
| 41 | #define tx_to_iop_adma_slot(tx) \ |
| 42 | container_of(tx, struct iop_adma_desc_slot, async_tx) |
| 43 | |
| 44 | /** |
| 45 | * iop_adma_free_slots - flags descriptor slots for reuse |
| 46 | * @slot: Slot to free |
| 47 | * Caller must hold &iop_chan->lock while calling this function |
| 48 | */ |
| 49 | static void iop_adma_free_slots(struct iop_adma_desc_slot *slot) |
| 50 | { |
| 51 | int stride = slot->slots_per_op; |
| 52 | |
| 53 | while (stride--) { |
| 54 | slot->slots_per_op = 0; |
| 55 | slot = list_entry(slot->slot_node.next, |
| 56 | struct iop_adma_desc_slot, |
| 57 | slot_node); |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | static dma_cookie_t |
| 62 | iop_adma_run_tx_complete_actions(struct iop_adma_desc_slot *desc, |
| 63 | struct iop_adma_chan *iop_chan, dma_cookie_t cookie) |
| 64 | { |
| 65 | BUG_ON(desc->async_tx.cookie < 0); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 66 | if (desc->async_tx.cookie > 0) { |
| 67 | cookie = desc->async_tx.cookie; |
| 68 | desc->async_tx.cookie = 0; |
| 69 | |
| 70 | /* call the callback (must not sleep or submit new |
| 71 | * operations to this channel) |
| 72 | */ |
| 73 | if (desc->async_tx.callback) |
| 74 | desc->async_tx.callback( |
| 75 | desc->async_tx.callback_param); |
| 76 | |
| 77 | /* unmap dma addresses |
| 78 | * (unmap_single vs unmap_page?) |
| 79 | */ |
| 80 | if (desc->group_head && desc->unmap_len) { |
| 81 | struct iop_adma_desc_slot *unmap = desc->group_head; |
| 82 | struct device *dev = |
| 83 | &iop_chan->device->pdev->dev; |
| 84 | u32 len = unmap->unmap_len; |
Dan Williams | e1d181e | 2008-07-04 00:13:40 -0700 | [diff] [blame] | 85 | enum dma_ctrl_flags flags = desc->async_tx.flags; |
| 86 | u32 src_cnt; |
| 87 | dma_addr_t addr; |
Dan Williams | a06d568 | 2008-12-08 13:46:00 -0700 | [diff] [blame] | 88 | dma_addr_t dest; |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 89 | |
Dan Williams | a06d568 | 2008-12-08 13:46:00 -0700 | [diff] [blame] | 90 | src_cnt = unmap->unmap_src_cnt; |
| 91 | dest = iop_desc_get_dest_addr(unmap, iop_chan); |
Dan Williams | e1d181e | 2008-07-04 00:13:40 -0700 | [diff] [blame] | 92 | if (!(flags & DMA_COMPL_SKIP_DEST_UNMAP)) { |
Dan Williams | a06d568 | 2008-12-08 13:46:00 -0700 | [diff] [blame] | 93 | enum dma_data_direction dir; |
| 94 | |
| 95 | if (src_cnt > 1) /* is xor? */ |
| 96 | dir = DMA_BIDIRECTIONAL; |
| 97 | else |
| 98 | dir = DMA_FROM_DEVICE; |
| 99 | |
| 100 | dma_unmap_page(dev, dest, len, dir); |
Dan Williams | e1d181e | 2008-07-04 00:13:40 -0700 | [diff] [blame] | 101 | } |
| 102 | |
| 103 | if (!(flags & DMA_COMPL_SKIP_SRC_UNMAP)) { |
Dan Williams | e1d181e | 2008-07-04 00:13:40 -0700 | [diff] [blame] | 104 | while (src_cnt--) { |
| 105 | addr = iop_desc_get_src_addr(unmap, |
| 106 | iop_chan, |
| 107 | src_cnt); |
Dan Williams | a06d568 | 2008-12-08 13:46:00 -0700 | [diff] [blame] | 108 | if (addr == dest) |
| 109 | continue; |
Dan Williams | e1d181e | 2008-07-04 00:13:40 -0700 | [diff] [blame] | 110 | dma_unmap_page(dev, addr, len, |
| 111 | DMA_TO_DEVICE); |
| 112 | } |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 113 | } |
| 114 | desc->group_head = NULL; |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | /* run dependent operations */ |
| 119 | async_tx_run_dependencies(&desc->async_tx); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 120 | |
| 121 | return cookie; |
| 122 | } |
| 123 | |
| 124 | static int |
| 125 | iop_adma_clean_slot(struct iop_adma_desc_slot *desc, |
| 126 | struct iop_adma_chan *iop_chan) |
| 127 | { |
| 128 | /* the client is allowed to attach dependent operations |
| 129 | * until 'ack' is set |
| 130 | */ |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 131 | if (!async_tx_test_ack(&desc->async_tx)) |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 132 | return 0; |
| 133 | |
| 134 | /* leave the last descriptor in the chain |
| 135 | * so we can append to it |
| 136 | */ |
| 137 | if (desc->chain_node.next == &iop_chan->chain) |
| 138 | return 1; |
| 139 | |
| 140 | dev_dbg(iop_chan->device->common.dev, |
| 141 | "\tfree slot: %d slots_per_op: %d\n", |
| 142 | desc->idx, desc->slots_per_op); |
| 143 | |
| 144 | list_del(&desc->chain_node); |
| 145 | iop_adma_free_slots(desc); |
| 146 | |
| 147 | return 0; |
| 148 | } |
| 149 | |
| 150 | static void __iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan) |
| 151 | { |
| 152 | struct iop_adma_desc_slot *iter, *_iter, *grp_start = NULL; |
| 153 | dma_cookie_t cookie = 0; |
| 154 | u32 current_desc = iop_chan_get_current_descriptor(iop_chan); |
| 155 | int busy = iop_chan_is_busy(iop_chan); |
| 156 | int seen_current = 0, slot_cnt = 0, slots_per_op = 0; |
| 157 | |
Harvey Harrison | 3d9b525 | 2008-03-13 17:45:28 -0700 | [diff] [blame] | 158 | dev_dbg(iop_chan->device->common.dev, "%s\n", __func__); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 159 | /* free completed slots from the chain starting with |
| 160 | * the oldest descriptor |
| 161 | */ |
| 162 | list_for_each_entry_safe(iter, _iter, &iop_chan->chain, |
| 163 | chain_node) { |
| 164 | pr_debug("\tcookie: %d slot: %d busy: %d " |
| 165 | "this_desc: %#x next_desc: %#x ack: %d\n", |
| 166 | iter->async_tx.cookie, iter->idx, busy, |
| 167 | iter->async_tx.phys, iop_desc_get_next_desc(iter), |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 168 | async_tx_test_ack(&iter->async_tx)); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 169 | prefetch(_iter); |
| 170 | prefetch(&_iter->async_tx); |
| 171 | |
| 172 | /* do not advance past the current descriptor loaded into the |
| 173 | * hardware channel, subsequent descriptors are either in |
| 174 | * process or have not been submitted |
| 175 | */ |
| 176 | if (seen_current) |
| 177 | break; |
| 178 | |
| 179 | /* stop the search if we reach the current descriptor and the |
| 180 | * channel is busy, or if it appears that the current descriptor |
| 181 | * needs to be re-read (i.e. has been appended to) |
| 182 | */ |
| 183 | if (iter->async_tx.phys == current_desc) { |
| 184 | BUG_ON(seen_current++); |
| 185 | if (busy || iop_desc_get_next_desc(iter)) |
| 186 | break; |
| 187 | } |
| 188 | |
| 189 | /* detect the start of a group transaction */ |
| 190 | if (!slot_cnt && !slots_per_op) { |
| 191 | slot_cnt = iter->slot_cnt; |
| 192 | slots_per_op = iter->slots_per_op; |
| 193 | if (slot_cnt <= slots_per_op) { |
| 194 | slot_cnt = 0; |
| 195 | slots_per_op = 0; |
| 196 | } |
| 197 | } |
| 198 | |
| 199 | if (slot_cnt) { |
| 200 | pr_debug("\tgroup++\n"); |
| 201 | if (!grp_start) |
| 202 | grp_start = iter; |
| 203 | slot_cnt -= slots_per_op; |
| 204 | } |
| 205 | |
| 206 | /* all the members of a group are complete */ |
| 207 | if (slots_per_op != 0 && slot_cnt == 0) { |
| 208 | struct iop_adma_desc_slot *grp_iter, *_grp_iter; |
| 209 | int end_of_chain = 0; |
| 210 | pr_debug("\tgroup end\n"); |
| 211 | |
| 212 | /* collect the total results */ |
| 213 | if (grp_start->xor_check_result) { |
| 214 | u32 zero_sum_result = 0; |
| 215 | slot_cnt = grp_start->slot_cnt; |
| 216 | grp_iter = grp_start; |
| 217 | |
| 218 | list_for_each_entry_from(grp_iter, |
| 219 | &iop_chan->chain, chain_node) { |
| 220 | zero_sum_result |= |
| 221 | iop_desc_get_zero_result(grp_iter); |
| 222 | pr_debug("\titer%d result: %d\n", |
| 223 | grp_iter->idx, zero_sum_result); |
| 224 | slot_cnt -= slots_per_op; |
| 225 | if (slot_cnt == 0) |
| 226 | break; |
| 227 | } |
| 228 | pr_debug("\tgrp_start->xor_check_result: %p\n", |
| 229 | grp_start->xor_check_result); |
| 230 | *grp_start->xor_check_result = zero_sum_result; |
| 231 | } |
| 232 | |
| 233 | /* clean up the group */ |
| 234 | slot_cnt = grp_start->slot_cnt; |
| 235 | grp_iter = grp_start; |
| 236 | list_for_each_entry_safe_from(grp_iter, _grp_iter, |
| 237 | &iop_chan->chain, chain_node) { |
| 238 | cookie = iop_adma_run_tx_complete_actions( |
| 239 | grp_iter, iop_chan, cookie); |
| 240 | |
| 241 | slot_cnt -= slots_per_op; |
| 242 | end_of_chain = iop_adma_clean_slot(grp_iter, |
| 243 | iop_chan); |
| 244 | |
| 245 | if (slot_cnt == 0 || end_of_chain) |
| 246 | break; |
| 247 | } |
| 248 | |
| 249 | /* the group should be complete at this point */ |
| 250 | BUG_ON(slot_cnt); |
| 251 | |
| 252 | slots_per_op = 0; |
| 253 | grp_start = NULL; |
| 254 | if (end_of_chain) |
| 255 | break; |
| 256 | else |
| 257 | continue; |
| 258 | } else if (slots_per_op) /* wait for group completion */ |
| 259 | continue; |
| 260 | |
| 261 | /* write back zero sum results (single descriptor case) */ |
| 262 | if (iter->xor_check_result && iter->async_tx.cookie) |
| 263 | *iter->xor_check_result = |
| 264 | iop_desc_get_zero_result(iter); |
| 265 | |
| 266 | cookie = iop_adma_run_tx_complete_actions( |
| 267 | iter, iop_chan, cookie); |
| 268 | |
| 269 | if (iop_adma_clean_slot(iter, iop_chan)) |
| 270 | break; |
| 271 | } |
| 272 | |
| 273 | BUG_ON(!seen_current); |
| 274 | |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 275 | if (cookie > 0) { |
| 276 | iop_chan->completed_cookie = cookie; |
| 277 | pr_debug("\tcompleted cookie %d\n", cookie); |
| 278 | } |
| 279 | } |
| 280 | |
| 281 | static void |
| 282 | iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan) |
| 283 | { |
| 284 | spin_lock_bh(&iop_chan->lock); |
| 285 | __iop_adma_slot_cleanup(iop_chan); |
| 286 | spin_unlock_bh(&iop_chan->lock); |
| 287 | } |
| 288 | |
| 289 | static void iop_adma_tasklet(unsigned long data) |
| 290 | { |
Dan Williams | 19242d7 | 2008-04-17 20:17:25 -0700 | [diff] [blame] | 291 | struct iop_adma_chan *iop_chan = (struct iop_adma_chan *) data; |
| 292 | |
| 293 | spin_lock(&iop_chan->lock); |
| 294 | __iop_adma_slot_cleanup(iop_chan); |
| 295 | spin_unlock(&iop_chan->lock); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 296 | } |
| 297 | |
| 298 | static struct iop_adma_desc_slot * |
| 299 | iop_adma_alloc_slots(struct iop_adma_chan *iop_chan, int num_slots, |
| 300 | int slots_per_op) |
| 301 | { |
| 302 | struct iop_adma_desc_slot *iter, *_iter, *alloc_start = NULL; |
Denis Cheng | e73ef9a | 2008-02-02 19:30:01 -0700 | [diff] [blame] | 303 | LIST_HEAD(chain); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 304 | int slots_found, retry = 0; |
| 305 | |
| 306 | /* start search from the last allocated descrtiptor |
| 307 | * if a contiguous allocation can not be found start searching |
| 308 | * from the beginning of the list |
| 309 | */ |
| 310 | retry: |
| 311 | slots_found = 0; |
| 312 | if (retry == 0) |
| 313 | iter = iop_chan->last_used; |
| 314 | else |
| 315 | iter = list_entry(&iop_chan->all_slots, |
| 316 | struct iop_adma_desc_slot, |
| 317 | slot_node); |
| 318 | |
| 319 | list_for_each_entry_safe_continue( |
| 320 | iter, _iter, &iop_chan->all_slots, slot_node) { |
| 321 | prefetch(_iter); |
| 322 | prefetch(&_iter->async_tx); |
| 323 | if (iter->slots_per_op) { |
| 324 | /* give up after finding the first busy slot |
| 325 | * on the second pass through the list |
| 326 | */ |
| 327 | if (retry) |
| 328 | break; |
| 329 | |
| 330 | slots_found = 0; |
| 331 | continue; |
| 332 | } |
| 333 | |
| 334 | /* start the allocation if the slot is correctly aligned */ |
| 335 | if (!slots_found++) { |
| 336 | if (iop_desc_is_aligned(iter, slots_per_op)) |
| 337 | alloc_start = iter; |
| 338 | else { |
| 339 | slots_found = 0; |
| 340 | continue; |
| 341 | } |
| 342 | } |
| 343 | |
| 344 | if (slots_found == num_slots) { |
| 345 | struct iop_adma_desc_slot *alloc_tail = NULL; |
| 346 | struct iop_adma_desc_slot *last_used = NULL; |
| 347 | iter = alloc_start; |
| 348 | while (num_slots) { |
| 349 | int i; |
| 350 | dev_dbg(iop_chan->device->common.dev, |
| 351 | "allocated slot: %d " |
| 352 | "(desc %p phys: %#x) slots_per_op %d\n", |
| 353 | iter->idx, iter->hw_desc, |
| 354 | iter->async_tx.phys, slots_per_op); |
| 355 | |
| 356 | /* pre-ack all but the last descriptor */ |
| 357 | if (num_slots != slots_per_op) |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 358 | async_tx_ack(&iter->async_tx); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 359 | |
| 360 | list_add_tail(&iter->chain_node, &chain); |
| 361 | alloc_tail = iter; |
| 362 | iter->async_tx.cookie = 0; |
| 363 | iter->slot_cnt = num_slots; |
| 364 | iter->xor_check_result = NULL; |
| 365 | for (i = 0; i < slots_per_op; i++) { |
| 366 | iter->slots_per_op = slots_per_op - i; |
| 367 | last_used = iter; |
| 368 | iter = list_entry(iter->slot_node.next, |
| 369 | struct iop_adma_desc_slot, |
| 370 | slot_node); |
| 371 | } |
| 372 | num_slots -= slots_per_op; |
| 373 | } |
| 374 | alloc_tail->group_head = alloc_start; |
| 375 | alloc_tail->async_tx.cookie = -EBUSY; |
| 376 | list_splice(&chain, &alloc_tail->async_tx.tx_list); |
| 377 | iop_chan->last_used = last_used; |
| 378 | iop_desc_clear_next_desc(alloc_start); |
| 379 | iop_desc_clear_next_desc(alloc_tail); |
| 380 | return alloc_tail; |
| 381 | } |
| 382 | } |
| 383 | if (!retry++) |
| 384 | goto retry; |
| 385 | |
Dan Williams | c7141d0 | 2008-07-17 17:59:56 -0700 | [diff] [blame] | 386 | /* perform direct reclaim if the allocation fails */ |
| 387 | __iop_adma_slot_cleanup(iop_chan); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 388 | |
| 389 | return NULL; |
| 390 | } |
| 391 | |
| 392 | static dma_cookie_t |
| 393 | iop_desc_assign_cookie(struct iop_adma_chan *iop_chan, |
| 394 | struct iop_adma_desc_slot *desc) |
| 395 | { |
| 396 | dma_cookie_t cookie = iop_chan->common.cookie; |
| 397 | cookie++; |
| 398 | if (cookie < 0) |
| 399 | cookie = 1; |
| 400 | iop_chan->common.cookie = desc->async_tx.cookie = cookie; |
| 401 | return cookie; |
| 402 | } |
| 403 | |
| 404 | static void iop_adma_check_threshold(struct iop_adma_chan *iop_chan) |
| 405 | { |
| 406 | dev_dbg(iop_chan->device->common.dev, "pending: %d\n", |
| 407 | iop_chan->pending); |
| 408 | |
| 409 | if (iop_chan->pending >= IOP_ADMA_THRESHOLD) { |
| 410 | iop_chan->pending = 0; |
| 411 | iop_chan_append(iop_chan); |
| 412 | } |
| 413 | } |
| 414 | |
| 415 | static dma_cookie_t |
| 416 | iop_adma_tx_submit(struct dma_async_tx_descriptor *tx) |
| 417 | { |
| 418 | struct iop_adma_desc_slot *sw_desc = tx_to_iop_adma_slot(tx); |
| 419 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(tx->chan); |
| 420 | struct iop_adma_desc_slot *grp_start, *old_chain_tail; |
| 421 | int slot_cnt; |
| 422 | int slots_per_op; |
| 423 | dma_cookie_t cookie; |
Dan Williams | 137cb55 | 2008-11-11 13:12:33 -0700 | [diff] [blame] | 424 | dma_addr_t next_dma; |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 425 | |
| 426 | grp_start = sw_desc->group_head; |
| 427 | slot_cnt = grp_start->slot_cnt; |
| 428 | slots_per_op = grp_start->slots_per_op; |
| 429 | |
| 430 | spin_lock_bh(&iop_chan->lock); |
| 431 | cookie = iop_desc_assign_cookie(iop_chan, sw_desc); |
| 432 | |
| 433 | old_chain_tail = list_entry(iop_chan->chain.prev, |
| 434 | struct iop_adma_desc_slot, chain_node); |
| 435 | list_splice_init(&sw_desc->async_tx.tx_list, |
| 436 | &old_chain_tail->chain_node); |
| 437 | |
| 438 | /* fix up the hardware chain */ |
Dan Williams | 137cb55 | 2008-11-11 13:12:33 -0700 | [diff] [blame] | 439 | next_dma = grp_start->async_tx.phys; |
| 440 | iop_desc_set_next_desc(old_chain_tail, next_dma); |
| 441 | BUG_ON(iop_desc_get_next_desc(old_chain_tail) != next_dma); /* flush */ |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 442 | |
Dan Williams | 137cb55 | 2008-11-11 13:12:33 -0700 | [diff] [blame] | 443 | /* check for pre-chained descriptors */ |
Dan Williams | 65e5038 | 2008-11-11 13:12:33 -0700 | [diff] [blame] | 444 | iop_paranoia(iop_desc_get_next_desc(sw_desc)); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 445 | |
| 446 | /* increment the pending count by the number of slots |
| 447 | * memcpy operations have a 1:1 (slot:operation) relation |
| 448 | * other operations are heavier and will pop the threshold |
| 449 | * more often. |
| 450 | */ |
| 451 | iop_chan->pending += slot_cnt; |
| 452 | iop_adma_check_threshold(iop_chan); |
| 453 | spin_unlock_bh(&iop_chan->lock); |
| 454 | |
| 455 | dev_dbg(iop_chan->device->common.dev, "%s cookie: %d slot: %d\n", |
Harvey Harrison | 3d9b525 | 2008-03-13 17:45:28 -0700 | [diff] [blame] | 456 | __func__, sw_desc->async_tx.cookie, sw_desc->idx); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 457 | |
| 458 | return cookie; |
| 459 | } |
| 460 | |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 461 | static void iop_chan_start_null_memcpy(struct iop_adma_chan *iop_chan); |
| 462 | static void iop_chan_start_null_xor(struct iop_adma_chan *iop_chan); |
| 463 | |
Dan Williams | 5eb907a | 2008-07-17 17:59:56 -0700 | [diff] [blame] | 464 | /** |
| 465 | * iop_adma_alloc_chan_resources - returns the number of allocated descriptors |
| 466 | * @chan - allocate descriptor resources for this channel |
| 467 | * @client - current client requesting the channel be ready for requests |
| 468 | * |
| 469 | * Note: We keep the slots for 1 operation on iop_chan->chain at all times. To |
| 470 | * avoid deadlock, via async_xor, num_descs_in_pool must at a minimum be |
| 471 | * greater than 2x the number slots needed to satisfy a device->max_xor |
| 472 | * request. |
| 473 | * */ |
Haavard Skinnemoen | 848c536 | 2008-07-08 11:58:58 -0700 | [diff] [blame] | 474 | static int iop_adma_alloc_chan_resources(struct dma_chan *chan, |
| 475 | struct dma_client *client) |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 476 | { |
| 477 | char *hw_desc; |
| 478 | int idx; |
| 479 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); |
| 480 | struct iop_adma_desc_slot *slot = NULL; |
| 481 | int init = iop_chan->slots_allocated ? 0 : 1; |
| 482 | struct iop_adma_platform_data *plat_data = |
| 483 | iop_chan->device->pdev->dev.platform_data; |
| 484 | int num_descs_in_pool = plat_data->pool_size/IOP_ADMA_SLOT_SIZE; |
| 485 | |
| 486 | /* Allocate descriptor slots */ |
| 487 | do { |
| 488 | idx = iop_chan->slots_allocated; |
| 489 | if (idx == num_descs_in_pool) |
| 490 | break; |
| 491 | |
| 492 | slot = kzalloc(sizeof(*slot), GFP_KERNEL); |
| 493 | if (!slot) { |
| 494 | printk(KERN_INFO "IOP ADMA Channel only initialized" |
| 495 | " %d descriptor slots", idx); |
| 496 | break; |
| 497 | } |
| 498 | hw_desc = (char *) iop_chan->device->dma_desc_pool_virt; |
| 499 | slot->hw_desc = (void *) &hw_desc[idx * IOP_ADMA_SLOT_SIZE]; |
| 500 | |
| 501 | dma_async_tx_descriptor_init(&slot->async_tx, chan); |
| 502 | slot->async_tx.tx_submit = iop_adma_tx_submit; |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 503 | INIT_LIST_HEAD(&slot->chain_node); |
| 504 | INIT_LIST_HEAD(&slot->slot_node); |
| 505 | INIT_LIST_HEAD(&slot->async_tx.tx_list); |
| 506 | hw_desc = (char *) iop_chan->device->dma_desc_pool; |
| 507 | slot->async_tx.phys = |
| 508 | (dma_addr_t) &hw_desc[idx * IOP_ADMA_SLOT_SIZE]; |
| 509 | slot->idx = idx; |
| 510 | |
| 511 | spin_lock_bh(&iop_chan->lock); |
| 512 | iop_chan->slots_allocated++; |
| 513 | list_add_tail(&slot->slot_node, &iop_chan->all_slots); |
| 514 | spin_unlock_bh(&iop_chan->lock); |
| 515 | } while (iop_chan->slots_allocated < num_descs_in_pool); |
| 516 | |
| 517 | if (idx && !iop_chan->last_used) |
| 518 | iop_chan->last_used = list_entry(iop_chan->all_slots.next, |
| 519 | struct iop_adma_desc_slot, |
| 520 | slot_node); |
| 521 | |
| 522 | dev_dbg(iop_chan->device->common.dev, |
| 523 | "allocated %d descriptor slots last_used: %p\n", |
| 524 | iop_chan->slots_allocated, iop_chan->last_used); |
| 525 | |
| 526 | /* initialize the channel and the chain with a null operation */ |
| 527 | if (init) { |
| 528 | if (dma_has_cap(DMA_MEMCPY, |
| 529 | iop_chan->device->common.cap_mask)) |
| 530 | iop_chan_start_null_memcpy(iop_chan); |
| 531 | else if (dma_has_cap(DMA_XOR, |
| 532 | iop_chan->device->common.cap_mask)) |
| 533 | iop_chan_start_null_xor(iop_chan); |
| 534 | else |
| 535 | BUG(); |
| 536 | } |
| 537 | |
| 538 | return (idx > 0) ? idx : -ENOMEM; |
| 539 | } |
| 540 | |
| 541 | static struct dma_async_tx_descriptor * |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 542 | iop_adma_prep_dma_interrupt(struct dma_chan *chan, unsigned long flags) |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 543 | { |
| 544 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); |
| 545 | struct iop_adma_desc_slot *sw_desc, *grp_start; |
| 546 | int slot_cnt, slots_per_op; |
| 547 | |
Harvey Harrison | 3d9b525 | 2008-03-13 17:45:28 -0700 | [diff] [blame] | 548 | dev_dbg(iop_chan->device->common.dev, "%s\n", __func__); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 549 | |
| 550 | spin_lock_bh(&iop_chan->lock); |
| 551 | slot_cnt = iop_chan_interrupt_slot_count(&slots_per_op, iop_chan); |
| 552 | sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); |
| 553 | if (sw_desc) { |
| 554 | grp_start = sw_desc->group_head; |
| 555 | iop_desc_init_interrupt(grp_start, iop_chan); |
| 556 | grp_start->unmap_len = 0; |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 557 | sw_desc->async_tx.flags = flags; |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 558 | } |
| 559 | spin_unlock_bh(&iop_chan->lock); |
| 560 | |
| 561 | return sw_desc ? &sw_desc->async_tx : NULL; |
| 562 | } |
| 563 | |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 564 | static struct dma_async_tx_descriptor * |
Dan Williams | 0036731 | 2008-02-02 19:49:57 -0700 | [diff] [blame] | 565 | iop_adma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dma_dest, |
Dan Williams | d4c56f9 | 2008-02-02 19:49:58 -0700 | [diff] [blame] | 566 | dma_addr_t dma_src, size_t len, unsigned long flags) |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 567 | { |
| 568 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); |
| 569 | struct iop_adma_desc_slot *sw_desc, *grp_start; |
| 570 | int slot_cnt, slots_per_op; |
| 571 | |
| 572 | if (unlikely(!len)) |
| 573 | return NULL; |
| 574 | BUG_ON(unlikely(len > IOP_ADMA_MAX_BYTE_COUNT)); |
| 575 | |
| 576 | dev_dbg(iop_chan->device->common.dev, "%s len: %u\n", |
Harvey Harrison | 3d9b525 | 2008-03-13 17:45:28 -0700 | [diff] [blame] | 577 | __func__, len); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 578 | |
| 579 | spin_lock_bh(&iop_chan->lock); |
| 580 | slot_cnt = iop_chan_memcpy_slot_count(len, &slots_per_op); |
| 581 | sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); |
| 582 | if (sw_desc) { |
| 583 | grp_start = sw_desc->group_head; |
Dan Williams | d4c56f9 | 2008-02-02 19:49:58 -0700 | [diff] [blame] | 584 | iop_desc_init_memcpy(grp_start, flags); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 585 | iop_desc_set_byte_count(grp_start, iop_chan, len); |
Dan Williams | 0036731 | 2008-02-02 19:49:57 -0700 | [diff] [blame] | 586 | iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest); |
| 587 | iop_desc_set_memcpy_src_addr(grp_start, dma_src); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 588 | sw_desc->unmap_src_cnt = 1; |
| 589 | sw_desc->unmap_len = len; |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 590 | sw_desc->async_tx.flags = flags; |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 591 | } |
| 592 | spin_unlock_bh(&iop_chan->lock); |
| 593 | |
| 594 | return sw_desc ? &sw_desc->async_tx : NULL; |
| 595 | } |
| 596 | |
| 597 | static struct dma_async_tx_descriptor * |
Dan Williams | 0036731 | 2008-02-02 19:49:57 -0700 | [diff] [blame] | 598 | iop_adma_prep_dma_memset(struct dma_chan *chan, dma_addr_t dma_dest, |
Dan Williams | d4c56f9 | 2008-02-02 19:49:58 -0700 | [diff] [blame] | 599 | int value, size_t len, unsigned long flags) |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 600 | { |
| 601 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); |
| 602 | struct iop_adma_desc_slot *sw_desc, *grp_start; |
| 603 | int slot_cnt, slots_per_op; |
| 604 | |
| 605 | if (unlikely(!len)) |
| 606 | return NULL; |
| 607 | BUG_ON(unlikely(len > IOP_ADMA_MAX_BYTE_COUNT)); |
| 608 | |
| 609 | dev_dbg(iop_chan->device->common.dev, "%s len: %u\n", |
Harvey Harrison | 3d9b525 | 2008-03-13 17:45:28 -0700 | [diff] [blame] | 610 | __func__, len); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 611 | |
| 612 | spin_lock_bh(&iop_chan->lock); |
| 613 | slot_cnt = iop_chan_memset_slot_count(len, &slots_per_op); |
| 614 | sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); |
| 615 | if (sw_desc) { |
| 616 | grp_start = sw_desc->group_head; |
Dan Williams | d4c56f9 | 2008-02-02 19:49:58 -0700 | [diff] [blame] | 617 | iop_desc_init_memset(grp_start, flags); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 618 | iop_desc_set_byte_count(grp_start, iop_chan, len); |
| 619 | iop_desc_set_block_fill_val(grp_start, value); |
Dan Williams | 0036731 | 2008-02-02 19:49:57 -0700 | [diff] [blame] | 620 | iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 621 | sw_desc->unmap_src_cnt = 1; |
| 622 | sw_desc->unmap_len = len; |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 623 | sw_desc->async_tx.flags = flags; |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 624 | } |
| 625 | spin_unlock_bh(&iop_chan->lock); |
| 626 | |
| 627 | return sw_desc ? &sw_desc->async_tx : NULL; |
| 628 | } |
| 629 | |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 630 | static struct dma_async_tx_descriptor * |
Dan Williams | 0036731 | 2008-02-02 19:49:57 -0700 | [diff] [blame] | 631 | iop_adma_prep_dma_xor(struct dma_chan *chan, dma_addr_t dma_dest, |
| 632 | dma_addr_t *dma_src, unsigned int src_cnt, size_t len, |
Dan Williams | d4c56f9 | 2008-02-02 19:49:58 -0700 | [diff] [blame] | 633 | unsigned long flags) |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 634 | { |
| 635 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); |
| 636 | struct iop_adma_desc_slot *sw_desc, *grp_start; |
| 637 | int slot_cnt, slots_per_op; |
| 638 | |
| 639 | if (unlikely(!len)) |
| 640 | return NULL; |
| 641 | BUG_ON(unlikely(len > IOP_ADMA_XOR_MAX_BYTE_COUNT)); |
| 642 | |
| 643 | dev_dbg(iop_chan->device->common.dev, |
Dan Williams | d4c56f9 | 2008-02-02 19:49:58 -0700 | [diff] [blame] | 644 | "%s src_cnt: %d len: %u flags: %lx\n", |
Harvey Harrison | 3d9b525 | 2008-03-13 17:45:28 -0700 | [diff] [blame] | 645 | __func__, src_cnt, len, flags); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 646 | |
| 647 | spin_lock_bh(&iop_chan->lock); |
| 648 | slot_cnt = iop_chan_xor_slot_count(len, src_cnt, &slots_per_op); |
| 649 | sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); |
| 650 | if (sw_desc) { |
| 651 | grp_start = sw_desc->group_head; |
Dan Williams | d4c56f9 | 2008-02-02 19:49:58 -0700 | [diff] [blame] | 652 | iop_desc_init_xor(grp_start, src_cnt, flags); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 653 | iop_desc_set_byte_count(grp_start, iop_chan, len); |
Dan Williams | 0036731 | 2008-02-02 19:49:57 -0700 | [diff] [blame] | 654 | iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 655 | sw_desc->unmap_src_cnt = src_cnt; |
| 656 | sw_desc->unmap_len = len; |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 657 | sw_desc->async_tx.flags = flags; |
Dan Williams | 0036731 | 2008-02-02 19:49:57 -0700 | [diff] [blame] | 658 | while (src_cnt--) |
| 659 | iop_desc_set_xor_src_addr(grp_start, src_cnt, |
| 660 | dma_src[src_cnt]); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 661 | } |
| 662 | spin_unlock_bh(&iop_chan->lock); |
| 663 | |
| 664 | return sw_desc ? &sw_desc->async_tx : NULL; |
| 665 | } |
| 666 | |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 667 | static struct dma_async_tx_descriptor * |
Dan Williams | 0036731 | 2008-02-02 19:49:57 -0700 | [diff] [blame] | 668 | iop_adma_prep_dma_zero_sum(struct dma_chan *chan, dma_addr_t *dma_src, |
| 669 | unsigned int src_cnt, size_t len, u32 *result, |
Dan Williams | d4c56f9 | 2008-02-02 19:49:58 -0700 | [diff] [blame] | 670 | unsigned long flags) |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 671 | { |
| 672 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); |
| 673 | struct iop_adma_desc_slot *sw_desc, *grp_start; |
| 674 | int slot_cnt, slots_per_op; |
| 675 | |
| 676 | if (unlikely(!len)) |
| 677 | return NULL; |
| 678 | |
| 679 | dev_dbg(iop_chan->device->common.dev, "%s src_cnt: %d len: %u\n", |
Harvey Harrison | 3d9b525 | 2008-03-13 17:45:28 -0700 | [diff] [blame] | 680 | __func__, src_cnt, len); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 681 | |
| 682 | spin_lock_bh(&iop_chan->lock); |
| 683 | slot_cnt = iop_chan_zero_sum_slot_count(len, src_cnt, &slots_per_op); |
| 684 | sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); |
| 685 | if (sw_desc) { |
| 686 | grp_start = sw_desc->group_head; |
Dan Williams | d4c56f9 | 2008-02-02 19:49:58 -0700 | [diff] [blame] | 687 | iop_desc_init_zero_sum(grp_start, src_cnt, flags); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 688 | iop_desc_set_zero_sum_byte_count(grp_start, len); |
| 689 | grp_start->xor_check_result = result; |
| 690 | pr_debug("\t%s: grp_start->xor_check_result: %p\n", |
Harvey Harrison | 3d9b525 | 2008-03-13 17:45:28 -0700 | [diff] [blame] | 691 | __func__, grp_start->xor_check_result); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 692 | sw_desc->unmap_src_cnt = src_cnt; |
| 693 | sw_desc->unmap_len = len; |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 694 | sw_desc->async_tx.flags = flags; |
Dan Williams | 0036731 | 2008-02-02 19:49:57 -0700 | [diff] [blame] | 695 | while (src_cnt--) |
| 696 | iop_desc_set_zero_sum_src_addr(grp_start, src_cnt, |
| 697 | dma_src[src_cnt]); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 698 | } |
| 699 | spin_unlock_bh(&iop_chan->lock); |
| 700 | |
| 701 | return sw_desc ? &sw_desc->async_tx : NULL; |
| 702 | } |
| 703 | |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 704 | static void iop_adma_free_chan_resources(struct dma_chan *chan) |
| 705 | { |
| 706 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); |
| 707 | struct iop_adma_desc_slot *iter, *_iter; |
| 708 | int in_use_descs = 0; |
| 709 | |
| 710 | iop_adma_slot_cleanup(iop_chan); |
| 711 | |
| 712 | spin_lock_bh(&iop_chan->lock); |
| 713 | list_for_each_entry_safe(iter, _iter, &iop_chan->chain, |
| 714 | chain_node) { |
| 715 | in_use_descs++; |
| 716 | list_del(&iter->chain_node); |
| 717 | } |
| 718 | list_for_each_entry_safe_reverse( |
| 719 | iter, _iter, &iop_chan->all_slots, slot_node) { |
| 720 | list_del(&iter->slot_node); |
| 721 | kfree(iter); |
| 722 | iop_chan->slots_allocated--; |
| 723 | } |
| 724 | iop_chan->last_used = NULL; |
| 725 | |
| 726 | dev_dbg(iop_chan->device->common.dev, "%s slots_allocated %d\n", |
Harvey Harrison | 3d9b525 | 2008-03-13 17:45:28 -0700 | [diff] [blame] | 727 | __func__, iop_chan->slots_allocated); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 728 | spin_unlock_bh(&iop_chan->lock); |
| 729 | |
| 730 | /* one is ok since we left it on there on purpose */ |
| 731 | if (in_use_descs > 1) |
| 732 | printk(KERN_ERR "IOP: Freeing %d in use descriptors!\n", |
| 733 | in_use_descs - 1); |
| 734 | } |
| 735 | |
| 736 | /** |
| 737 | * iop_adma_is_complete - poll the status of an ADMA transaction |
| 738 | * @chan: ADMA channel handle |
| 739 | * @cookie: ADMA transaction identifier |
| 740 | */ |
| 741 | static enum dma_status iop_adma_is_complete(struct dma_chan *chan, |
| 742 | dma_cookie_t cookie, |
| 743 | dma_cookie_t *done, |
| 744 | dma_cookie_t *used) |
| 745 | { |
| 746 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); |
| 747 | dma_cookie_t last_used; |
| 748 | dma_cookie_t last_complete; |
| 749 | enum dma_status ret; |
| 750 | |
| 751 | last_used = chan->cookie; |
| 752 | last_complete = iop_chan->completed_cookie; |
| 753 | |
| 754 | if (done) |
| 755 | *done = last_complete; |
| 756 | if (used) |
| 757 | *used = last_used; |
| 758 | |
| 759 | ret = dma_async_is_complete(cookie, last_complete, last_used); |
| 760 | if (ret == DMA_SUCCESS) |
| 761 | return ret; |
| 762 | |
| 763 | iop_adma_slot_cleanup(iop_chan); |
| 764 | |
| 765 | last_used = chan->cookie; |
| 766 | last_complete = iop_chan->completed_cookie; |
| 767 | |
| 768 | if (done) |
| 769 | *done = last_complete; |
| 770 | if (used) |
| 771 | *used = last_used; |
| 772 | |
| 773 | return dma_async_is_complete(cookie, last_complete, last_used); |
| 774 | } |
| 775 | |
| 776 | static irqreturn_t iop_adma_eot_handler(int irq, void *data) |
| 777 | { |
| 778 | struct iop_adma_chan *chan = data; |
| 779 | |
Harvey Harrison | 3d9b525 | 2008-03-13 17:45:28 -0700 | [diff] [blame] | 780 | dev_dbg(chan->device->common.dev, "%s\n", __func__); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 781 | |
| 782 | tasklet_schedule(&chan->irq_tasklet); |
| 783 | |
| 784 | iop_adma_device_clear_eot_status(chan); |
| 785 | |
| 786 | return IRQ_HANDLED; |
| 787 | } |
| 788 | |
| 789 | static irqreturn_t iop_adma_eoc_handler(int irq, void *data) |
| 790 | { |
| 791 | struct iop_adma_chan *chan = data; |
| 792 | |
Harvey Harrison | 3d9b525 | 2008-03-13 17:45:28 -0700 | [diff] [blame] | 793 | dev_dbg(chan->device->common.dev, "%s\n", __func__); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 794 | |
| 795 | tasklet_schedule(&chan->irq_tasklet); |
| 796 | |
| 797 | iop_adma_device_clear_eoc_status(chan); |
| 798 | |
| 799 | return IRQ_HANDLED; |
| 800 | } |
| 801 | |
| 802 | static irqreturn_t iop_adma_err_handler(int irq, void *data) |
| 803 | { |
| 804 | struct iop_adma_chan *chan = data; |
| 805 | unsigned long status = iop_chan_get_status(chan); |
| 806 | |
| 807 | dev_printk(KERN_ERR, chan->device->common.dev, |
| 808 | "error ( %s%s%s%s%s%s%s)\n", |
| 809 | iop_is_err_int_parity(status, chan) ? "int_parity " : "", |
| 810 | iop_is_err_mcu_abort(status, chan) ? "mcu_abort " : "", |
| 811 | iop_is_err_int_tabort(status, chan) ? "int_tabort " : "", |
| 812 | iop_is_err_int_mabort(status, chan) ? "int_mabort " : "", |
| 813 | iop_is_err_pci_tabort(status, chan) ? "pci_tabort " : "", |
| 814 | iop_is_err_pci_mabort(status, chan) ? "pci_mabort " : "", |
| 815 | iop_is_err_split_tx(status, chan) ? "split_tx " : ""); |
| 816 | |
| 817 | iop_adma_device_clear_err_status(chan); |
| 818 | |
| 819 | BUG(); |
| 820 | |
| 821 | return IRQ_HANDLED; |
| 822 | } |
| 823 | |
| 824 | static void iop_adma_issue_pending(struct dma_chan *chan) |
| 825 | { |
| 826 | struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); |
| 827 | |
| 828 | if (iop_chan->pending) { |
| 829 | iop_chan->pending = 0; |
| 830 | iop_chan_append(iop_chan); |
| 831 | } |
| 832 | } |
| 833 | |
| 834 | /* |
| 835 | * Perform a transaction to verify the HW works. |
| 836 | */ |
| 837 | #define IOP_ADMA_TEST_SIZE 2000 |
| 838 | |
| 839 | static int __devinit iop_adma_memcpy_self_test(struct iop_adma_device *device) |
| 840 | { |
| 841 | int i; |
| 842 | void *src, *dest; |
| 843 | dma_addr_t src_dma, dest_dma; |
| 844 | struct dma_chan *dma_chan; |
| 845 | dma_cookie_t cookie; |
| 846 | struct dma_async_tx_descriptor *tx; |
| 847 | int err = 0; |
| 848 | struct iop_adma_chan *iop_chan; |
| 849 | |
Harvey Harrison | 3d9b525 | 2008-03-13 17:45:28 -0700 | [diff] [blame] | 850 | dev_dbg(device->common.dev, "%s\n", __func__); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 851 | |
Christophe Jaillet | eccf214 | 2008-05-20 16:33:06 -0700 | [diff] [blame] | 852 | src = kmalloc(IOP_ADMA_TEST_SIZE, GFP_KERNEL); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 853 | if (!src) |
| 854 | return -ENOMEM; |
Christophe Jaillet | eccf214 | 2008-05-20 16:33:06 -0700 | [diff] [blame] | 855 | dest = kzalloc(IOP_ADMA_TEST_SIZE, GFP_KERNEL); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 856 | if (!dest) { |
| 857 | kfree(src); |
| 858 | return -ENOMEM; |
| 859 | } |
| 860 | |
| 861 | /* Fill in src buffer */ |
| 862 | for (i = 0; i < IOP_ADMA_TEST_SIZE; i++) |
| 863 | ((u8 *) src)[i] = (u8)i; |
| 864 | |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 865 | /* Start copy, using first DMA channel */ |
| 866 | dma_chan = container_of(device->common.channels.next, |
| 867 | struct dma_chan, |
| 868 | device_node); |
Haavard Skinnemoen | 848c536 | 2008-07-08 11:58:58 -0700 | [diff] [blame] | 869 | if (iop_adma_alloc_chan_resources(dma_chan, NULL) < 1) { |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 870 | err = -ENODEV; |
| 871 | goto out; |
| 872 | } |
| 873 | |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 874 | dest_dma = dma_map_single(dma_chan->device->dev, dest, |
| 875 | IOP_ADMA_TEST_SIZE, DMA_FROM_DEVICE); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 876 | src_dma = dma_map_single(dma_chan->device->dev, src, |
| 877 | IOP_ADMA_TEST_SIZE, DMA_TO_DEVICE); |
Dan Williams | 0036731 | 2008-02-02 19:49:57 -0700 | [diff] [blame] | 878 | tx = iop_adma_prep_dma_memcpy(dma_chan, dest_dma, src_dma, |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 879 | IOP_ADMA_TEST_SIZE, |
| 880 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 881 | |
| 882 | cookie = iop_adma_tx_submit(tx); |
| 883 | iop_adma_issue_pending(dma_chan); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 884 | msleep(1); |
| 885 | |
| 886 | if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) != |
| 887 | DMA_SUCCESS) { |
| 888 | dev_printk(KERN_ERR, dma_chan->device->dev, |
| 889 | "Self-test copy timed out, disabling\n"); |
| 890 | err = -ENODEV; |
| 891 | goto free_resources; |
| 892 | } |
| 893 | |
| 894 | iop_chan = to_iop_adma_chan(dma_chan); |
| 895 | dma_sync_single_for_cpu(&iop_chan->device->pdev->dev, dest_dma, |
| 896 | IOP_ADMA_TEST_SIZE, DMA_FROM_DEVICE); |
| 897 | if (memcmp(src, dest, IOP_ADMA_TEST_SIZE)) { |
| 898 | dev_printk(KERN_ERR, dma_chan->device->dev, |
| 899 | "Self-test copy failed compare, disabling\n"); |
| 900 | err = -ENODEV; |
| 901 | goto free_resources; |
| 902 | } |
| 903 | |
| 904 | free_resources: |
| 905 | iop_adma_free_chan_resources(dma_chan); |
| 906 | out: |
| 907 | kfree(src); |
| 908 | kfree(dest); |
| 909 | return err; |
| 910 | } |
| 911 | |
| 912 | #define IOP_ADMA_NUM_SRC_TEST 4 /* must be <= 15 */ |
| 913 | static int __devinit |
| 914 | iop_adma_xor_zero_sum_self_test(struct iop_adma_device *device) |
| 915 | { |
| 916 | int i, src_idx; |
| 917 | struct page *dest; |
| 918 | struct page *xor_srcs[IOP_ADMA_NUM_SRC_TEST]; |
| 919 | struct page *zero_sum_srcs[IOP_ADMA_NUM_SRC_TEST + 1]; |
Dan Williams | 0036731 | 2008-02-02 19:49:57 -0700 | [diff] [blame] | 920 | dma_addr_t dma_srcs[IOP_ADMA_NUM_SRC_TEST + 1]; |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 921 | dma_addr_t dma_addr, dest_dma; |
| 922 | struct dma_async_tx_descriptor *tx; |
| 923 | struct dma_chan *dma_chan; |
| 924 | dma_cookie_t cookie; |
| 925 | u8 cmp_byte = 0; |
| 926 | u32 cmp_word; |
| 927 | u32 zero_sum_result; |
| 928 | int err = 0; |
| 929 | struct iop_adma_chan *iop_chan; |
| 930 | |
Harvey Harrison | 3d9b525 | 2008-03-13 17:45:28 -0700 | [diff] [blame] | 931 | dev_dbg(device->common.dev, "%s\n", __func__); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 932 | |
| 933 | for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) { |
| 934 | xor_srcs[src_idx] = alloc_page(GFP_KERNEL); |
| 935 | if (!xor_srcs[src_idx]) |
| 936 | while (src_idx--) { |
| 937 | __free_page(xor_srcs[src_idx]); |
| 938 | return -ENOMEM; |
| 939 | } |
| 940 | } |
| 941 | |
| 942 | dest = alloc_page(GFP_KERNEL); |
| 943 | if (!dest) |
| 944 | while (src_idx--) { |
| 945 | __free_page(xor_srcs[src_idx]); |
| 946 | return -ENOMEM; |
| 947 | } |
| 948 | |
| 949 | /* Fill in src buffers */ |
| 950 | for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) { |
| 951 | u8 *ptr = page_address(xor_srcs[src_idx]); |
| 952 | for (i = 0; i < PAGE_SIZE; i++) |
| 953 | ptr[i] = (1 << src_idx); |
| 954 | } |
| 955 | |
| 956 | for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) |
| 957 | cmp_byte ^= (u8) (1 << src_idx); |
| 958 | |
| 959 | cmp_word = (cmp_byte << 24) | (cmp_byte << 16) | |
| 960 | (cmp_byte << 8) | cmp_byte; |
| 961 | |
| 962 | memset(page_address(dest), 0, PAGE_SIZE); |
| 963 | |
| 964 | dma_chan = container_of(device->common.channels.next, |
| 965 | struct dma_chan, |
| 966 | device_node); |
Haavard Skinnemoen | 848c536 | 2008-07-08 11:58:58 -0700 | [diff] [blame] | 967 | if (iop_adma_alloc_chan_resources(dma_chan, NULL) < 1) { |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 968 | err = -ENODEV; |
| 969 | goto out; |
| 970 | } |
| 971 | |
| 972 | /* test xor */ |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 973 | dest_dma = dma_map_page(dma_chan->device->dev, dest, 0, |
| 974 | PAGE_SIZE, DMA_FROM_DEVICE); |
Dan Williams | 0036731 | 2008-02-02 19:49:57 -0700 | [diff] [blame] | 975 | for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++) |
| 976 | dma_srcs[i] = dma_map_page(dma_chan->device->dev, xor_srcs[i], |
| 977 | 0, PAGE_SIZE, DMA_TO_DEVICE); |
| 978 | tx = iop_adma_prep_dma_xor(dma_chan, dest_dma, dma_srcs, |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 979 | IOP_ADMA_NUM_SRC_TEST, PAGE_SIZE, |
| 980 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 981 | |
| 982 | cookie = iop_adma_tx_submit(tx); |
| 983 | iop_adma_issue_pending(dma_chan); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 984 | msleep(8); |
| 985 | |
| 986 | if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) != |
| 987 | DMA_SUCCESS) { |
| 988 | dev_printk(KERN_ERR, dma_chan->device->dev, |
| 989 | "Self-test xor timed out, disabling\n"); |
| 990 | err = -ENODEV; |
| 991 | goto free_resources; |
| 992 | } |
| 993 | |
| 994 | iop_chan = to_iop_adma_chan(dma_chan); |
| 995 | dma_sync_single_for_cpu(&iop_chan->device->pdev->dev, dest_dma, |
| 996 | PAGE_SIZE, DMA_FROM_DEVICE); |
| 997 | for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) { |
| 998 | u32 *ptr = page_address(dest); |
| 999 | if (ptr[i] != cmp_word) { |
| 1000 | dev_printk(KERN_ERR, dma_chan->device->dev, |
| 1001 | "Self-test xor failed compare, disabling\n"); |
| 1002 | err = -ENODEV; |
| 1003 | goto free_resources; |
| 1004 | } |
| 1005 | } |
| 1006 | dma_sync_single_for_device(&iop_chan->device->pdev->dev, dest_dma, |
| 1007 | PAGE_SIZE, DMA_TO_DEVICE); |
| 1008 | |
| 1009 | /* skip zero sum if the capability is not present */ |
| 1010 | if (!dma_has_cap(DMA_ZERO_SUM, dma_chan->device->cap_mask)) |
| 1011 | goto free_resources; |
| 1012 | |
| 1013 | /* zero sum the sources with the destintation page */ |
| 1014 | for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++) |
| 1015 | zero_sum_srcs[i] = xor_srcs[i]; |
| 1016 | zero_sum_srcs[i] = dest; |
| 1017 | |
| 1018 | zero_sum_result = 1; |
| 1019 | |
Dan Williams | 0036731 | 2008-02-02 19:49:57 -0700 | [diff] [blame] | 1020 | for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 1; i++) |
| 1021 | dma_srcs[i] = dma_map_page(dma_chan->device->dev, |
| 1022 | zero_sum_srcs[i], 0, PAGE_SIZE, |
| 1023 | DMA_TO_DEVICE); |
| 1024 | tx = iop_adma_prep_dma_zero_sum(dma_chan, dma_srcs, |
| 1025 | IOP_ADMA_NUM_SRC_TEST + 1, PAGE_SIZE, |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 1026 | &zero_sum_result, |
| 1027 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 1028 | |
| 1029 | cookie = iop_adma_tx_submit(tx); |
| 1030 | iop_adma_issue_pending(dma_chan); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 1031 | msleep(8); |
| 1032 | |
| 1033 | if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) != DMA_SUCCESS) { |
| 1034 | dev_printk(KERN_ERR, dma_chan->device->dev, |
| 1035 | "Self-test zero sum timed out, disabling\n"); |
| 1036 | err = -ENODEV; |
| 1037 | goto free_resources; |
| 1038 | } |
| 1039 | |
| 1040 | if (zero_sum_result != 0) { |
| 1041 | dev_printk(KERN_ERR, dma_chan->device->dev, |
| 1042 | "Self-test zero sum failed compare, disabling\n"); |
| 1043 | err = -ENODEV; |
| 1044 | goto free_resources; |
| 1045 | } |
| 1046 | |
| 1047 | /* test memset */ |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 1048 | dma_addr = dma_map_page(dma_chan->device->dev, dest, 0, |
| 1049 | PAGE_SIZE, DMA_FROM_DEVICE); |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 1050 | tx = iop_adma_prep_dma_memset(dma_chan, dma_addr, 0, PAGE_SIZE, |
| 1051 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 1052 | |
| 1053 | cookie = iop_adma_tx_submit(tx); |
| 1054 | iop_adma_issue_pending(dma_chan); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 1055 | msleep(8); |
| 1056 | |
| 1057 | if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) != DMA_SUCCESS) { |
| 1058 | dev_printk(KERN_ERR, dma_chan->device->dev, |
| 1059 | "Self-test memset timed out, disabling\n"); |
| 1060 | err = -ENODEV; |
| 1061 | goto free_resources; |
| 1062 | } |
| 1063 | |
| 1064 | for (i = 0; i < PAGE_SIZE/sizeof(u32); i++) { |
| 1065 | u32 *ptr = page_address(dest); |
| 1066 | if (ptr[i]) { |
| 1067 | dev_printk(KERN_ERR, dma_chan->device->dev, |
| 1068 | "Self-test memset failed compare, disabling\n"); |
| 1069 | err = -ENODEV; |
| 1070 | goto free_resources; |
| 1071 | } |
| 1072 | } |
| 1073 | |
| 1074 | /* test for non-zero parity sum */ |
| 1075 | zero_sum_result = 0; |
Dan Williams | 0036731 | 2008-02-02 19:49:57 -0700 | [diff] [blame] | 1076 | for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 1; i++) |
| 1077 | dma_srcs[i] = dma_map_page(dma_chan->device->dev, |
| 1078 | zero_sum_srcs[i], 0, PAGE_SIZE, |
| 1079 | DMA_TO_DEVICE); |
| 1080 | tx = iop_adma_prep_dma_zero_sum(dma_chan, dma_srcs, |
| 1081 | IOP_ADMA_NUM_SRC_TEST + 1, PAGE_SIZE, |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 1082 | &zero_sum_result, |
| 1083 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 1084 | |
| 1085 | cookie = iop_adma_tx_submit(tx); |
| 1086 | iop_adma_issue_pending(dma_chan); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 1087 | msleep(8); |
| 1088 | |
| 1089 | if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) != DMA_SUCCESS) { |
| 1090 | dev_printk(KERN_ERR, dma_chan->device->dev, |
| 1091 | "Self-test non-zero sum timed out, disabling\n"); |
| 1092 | err = -ENODEV; |
| 1093 | goto free_resources; |
| 1094 | } |
| 1095 | |
| 1096 | if (zero_sum_result != 1) { |
| 1097 | dev_printk(KERN_ERR, dma_chan->device->dev, |
| 1098 | "Self-test non-zero sum failed compare, disabling\n"); |
| 1099 | err = -ENODEV; |
| 1100 | goto free_resources; |
| 1101 | } |
| 1102 | |
| 1103 | free_resources: |
| 1104 | iop_adma_free_chan_resources(dma_chan); |
| 1105 | out: |
| 1106 | src_idx = IOP_ADMA_NUM_SRC_TEST; |
| 1107 | while (src_idx--) |
| 1108 | __free_page(xor_srcs[src_idx]); |
| 1109 | __free_page(dest); |
| 1110 | return err; |
| 1111 | } |
| 1112 | |
| 1113 | static int __devexit iop_adma_remove(struct platform_device *dev) |
| 1114 | { |
| 1115 | struct iop_adma_device *device = platform_get_drvdata(dev); |
| 1116 | struct dma_chan *chan, *_chan; |
| 1117 | struct iop_adma_chan *iop_chan; |
| 1118 | int i; |
| 1119 | struct iop_adma_platform_data *plat_data = dev->dev.platform_data; |
| 1120 | |
| 1121 | dma_async_device_unregister(&device->common); |
| 1122 | |
| 1123 | for (i = 0; i < 3; i++) { |
| 1124 | unsigned int irq; |
| 1125 | irq = platform_get_irq(dev, i); |
| 1126 | free_irq(irq, device); |
| 1127 | } |
| 1128 | |
| 1129 | dma_free_coherent(&dev->dev, plat_data->pool_size, |
| 1130 | device->dma_desc_pool_virt, device->dma_desc_pool); |
| 1131 | |
| 1132 | do { |
| 1133 | struct resource *res; |
| 1134 | res = platform_get_resource(dev, IORESOURCE_MEM, 0); |
| 1135 | release_mem_region(res->start, res->end - res->start); |
| 1136 | } while (0); |
| 1137 | |
| 1138 | list_for_each_entry_safe(chan, _chan, &device->common.channels, |
| 1139 | device_node) { |
| 1140 | iop_chan = to_iop_adma_chan(chan); |
| 1141 | list_del(&chan->device_node); |
| 1142 | kfree(iop_chan); |
| 1143 | } |
| 1144 | kfree(device); |
| 1145 | |
| 1146 | return 0; |
| 1147 | } |
| 1148 | |
| 1149 | static int __devinit iop_adma_probe(struct platform_device *pdev) |
| 1150 | { |
| 1151 | struct resource *res; |
| 1152 | int ret = 0, i; |
| 1153 | struct iop_adma_device *adev; |
| 1154 | struct iop_adma_chan *iop_chan; |
| 1155 | struct dma_device *dma_dev; |
| 1156 | struct iop_adma_platform_data *plat_data = pdev->dev.platform_data; |
| 1157 | |
| 1158 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 1159 | if (!res) |
| 1160 | return -ENODEV; |
| 1161 | |
| 1162 | if (!devm_request_mem_region(&pdev->dev, res->start, |
| 1163 | res->end - res->start, pdev->name)) |
| 1164 | return -EBUSY; |
| 1165 | |
| 1166 | adev = kzalloc(sizeof(*adev), GFP_KERNEL); |
| 1167 | if (!adev) |
| 1168 | return -ENOMEM; |
| 1169 | dma_dev = &adev->common; |
| 1170 | |
| 1171 | /* allocate coherent memory for hardware descriptors |
| 1172 | * note: writecombine gives slightly better performance, but |
| 1173 | * requires that we explicitly flush the writes |
| 1174 | */ |
| 1175 | if ((adev->dma_desc_pool_virt = dma_alloc_writecombine(&pdev->dev, |
| 1176 | plat_data->pool_size, |
| 1177 | &adev->dma_desc_pool, |
| 1178 | GFP_KERNEL)) == NULL) { |
| 1179 | ret = -ENOMEM; |
| 1180 | goto err_free_adev; |
| 1181 | } |
| 1182 | |
| 1183 | dev_dbg(&pdev->dev, "%s: allocted descriptor pool virt %p phys %p\n", |
Harvey Harrison | 3d9b525 | 2008-03-13 17:45:28 -0700 | [diff] [blame] | 1184 | __func__, adev->dma_desc_pool_virt, |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 1185 | (void *) adev->dma_desc_pool); |
| 1186 | |
| 1187 | adev->id = plat_data->hw_id; |
| 1188 | |
| 1189 | /* discover transaction capabilites from the platform data */ |
| 1190 | dma_dev->cap_mask = plat_data->cap_mask; |
| 1191 | |
| 1192 | adev->pdev = pdev; |
| 1193 | platform_set_drvdata(pdev, adev); |
| 1194 | |
| 1195 | INIT_LIST_HEAD(&dma_dev->channels); |
| 1196 | |
| 1197 | /* set base routines */ |
| 1198 | dma_dev->device_alloc_chan_resources = iop_adma_alloc_chan_resources; |
| 1199 | dma_dev->device_free_chan_resources = iop_adma_free_chan_resources; |
| 1200 | dma_dev->device_is_tx_complete = iop_adma_is_complete; |
| 1201 | dma_dev->device_issue_pending = iop_adma_issue_pending; |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 1202 | dma_dev->dev = &pdev->dev; |
| 1203 | |
| 1204 | /* set prep routines based on capability */ |
| 1205 | if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) |
| 1206 | dma_dev->device_prep_dma_memcpy = iop_adma_prep_dma_memcpy; |
| 1207 | if (dma_has_cap(DMA_MEMSET, dma_dev->cap_mask)) |
| 1208 | dma_dev->device_prep_dma_memset = iop_adma_prep_dma_memset; |
| 1209 | if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) { |
| 1210 | dma_dev->max_xor = iop_adma_get_max_xor(); |
| 1211 | dma_dev->device_prep_dma_xor = iop_adma_prep_dma_xor; |
| 1212 | } |
| 1213 | if (dma_has_cap(DMA_ZERO_SUM, dma_dev->cap_mask)) |
| 1214 | dma_dev->device_prep_dma_zero_sum = |
| 1215 | iop_adma_prep_dma_zero_sum; |
| 1216 | if (dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask)) |
| 1217 | dma_dev->device_prep_dma_interrupt = |
| 1218 | iop_adma_prep_dma_interrupt; |
| 1219 | |
| 1220 | iop_chan = kzalloc(sizeof(*iop_chan), GFP_KERNEL); |
| 1221 | if (!iop_chan) { |
| 1222 | ret = -ENOMEM; |
| 1223 | goto err_free_dma; |
| 1224 | } |
| 1225 | iop_chan->device = adev; |
| 1226 | |
| 1227 | iop_chan->mmr_base = devm_ioremap(&pdev->dev, res->start, |
| 1228 | res->end - res->start); |
| 1229 | if (!iop_chan->mmr_base) { |
| 1230 | ret = -ENOMEM; |
| 1231 | goto err_free_iop_chan; |
| 1232 | } |
| 1233 | tasklet_init(&iop_chan->irq_tasklet, iop_adma_tasklet, (unsigned long) |
| 1234 | iop_chan); |
| 1235 | |
| 1236 | /* clear errors before enabling interrupts */ |
| 1237 | iop_adma_device_clear_err_status(iop_chan); |
| 1238 | |
| 1239 | for (i = 0; i < 3; i++) { |
| 1240 | irq_handler_t handler[] = { iop_adma_eot_handler, |
| 1241 | iop_adma_eoc_handler, |
| 1242 | iop_adma_err_handler }; |
| 1243 | int irq = platform_get_irq(pdev, i); |
| 1244 | if (irq < 0) { |
| 1245 | ret = -ENXIO; |
| 1246 | goto err_free_iop_chan; |
| 1247 | } else { |
| 1248 | ret = devm_request_irq(&pdev->dev, irq, |
| 1249 | handler[i], 0, pdev->name, iop_chan); |
| 1250 | if (ret) |
| 1251 | goto err_free_iop_chan; |
| 1252 | } |
| 1253 | } |
| 1254 | |
| 1255 | spin_lock_init(&iop_chan->lock); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 1256 | INIT_LIST_HEAD(&iop_chan->chain); |
| 1257 | INIT_LIST_HEAD(&iop_chan->all_slots); |
| 1258 | INIT_RCU_HEAD(&iop_chan->common.rcu); |
| 1259 | iop_chan->common.device = dma_dev; |
| 1260 | list_add_tail(&iop_chan->common.device_node, &dma_dev->channels); |
| 1261 | |
| 1262 | if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) { |
| 1263 | ret = iop_adma_memcpy_self_test(adev); |
| 1264 | dev_dbg(&pdev->dev, "memcpy self test returned %d\n", ret); |
| 1265 | if (ret) |
| 1266 | goto err_free_iop_chan; |
| 1267 | } |
| 1268 | |
| 1269 | if (dma_has_cap(DMA_XOR, dma_dev->cap_mask) || |
| 1270 | dma_has_cap(DMA_MEMSET, dma_dev->cap_mask)) { |
| 1271 | ret = iop_adma_xor_zero_sum_self_test(adev); |
| 1272 | dev_dbg(&pdev->dev, "xor self test returned %d\n", ret); |
| 1273 | if (ret) |
| 1274 | goto err_free_iop_chan; |
| 1275 | } |
| 1276 | |
| 1277 | dev_printk(KERN_INFO, &pdev->dev, "Intel(R) IOP: " |
| 1278 | "( %s%s%s%s%s%s%s%s%s%s)\n", |
| 1279 | dma_has_cap(DMA_PQ_XOR, dma_dev->cap_mask) ? "pq_xor " : "", |
| 1280 | dma_has_cap(DMA_PQ_UPDATE, dma_dev->cap_mask) ? "pq_update " : "", |
| 1281 | dma_has_cap(DMA_PQ_ZERO_SUM, dma_dev->cap_mask) ? "pq_zero_sum " : "", |
| 1282 | dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "xor " : "", |
| 1283 | dma_has_cap(DMA_DUAL_XOR, dma_dev->cap_mask) ? "dual_xor " : "", |
| 1284 | dma_has_cap(DMA_ZERO_SUM, dma_dev->cap_mask) ? "xor_zero_sum " : "", |
| 1285 | dma_has_cap(DMA_MEMSET, dma_dev->cap_mask) ? "fill " : "", |
| 1286 | dma_has_cap(DMA_MEMCPY_CRC32C, dma_dev->cap_mask) ? "cpy+crc " : "", |
| 1287 | dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask) ? "cpy " : "", |
| 1288 | dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask) ? "intr " : ""); |
| 1289 | |
| 1290 | dma_async_device_register(dma_dev); |
| 1291 | goto out; |
| 1292 | |
| 1293 | err_free_iop_chan: |
| 1294 | kfree(iop_chan); |
| 1295 | err_free_dma: |
| 1296 | dma_free_coherent(&adev->pdev->dev, plat_data->pool_size, |
| 1297 | adev->dma_desc_pool_virt, adev->dma_desc_pool); |
| 1298 | err_free_adev: |
| 1299 | kfree(adev); |
| 1300 | out: |
| 1301 | return ret; |
| 1302 | } |
| 1303 | |
| 1304 | static void iop_chan_start_null_memcpy(struct iop_adma_chan *iop_chan) |
| 1305 | { |
| 1306 | struct iop_adma_desc_slot *sw_desc, *grp_start; |
| 1307 | dma_cookie_t cookie; |
| 1308 | int slot_cnt, slots_per_op; |
| 1309 | |
Harvey Harrison | 3d9b525 | 2008-03-13 17:45:28 -0700 | [diff] [blame] | 1310 | dev_dbg(iop_chan->device->common.dev, "%s\n", __func__); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 1311 | |
| 1312 | spin_lock_bh(&iop_chan->lock); |
| 1313 | slot_cnt = iop_chan_memcpy_slot_count(0, &slots_per_op); |
| 1314 | sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); |
| 1315 | if (sw_desc) { |
| 1316 | grp_start = sw_desc->group_head; |
| 1317 | |
| 1318 | list_splice_init(&sw_desc->async_tx.tx_list, &iop_chan->chain); |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 1319 | async_tx_ack(&sw_desc->async_tx); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 1320 | iop_desc_init_memcpy(grp_start, 0); |
| 1321 | iop_desc_set_byte_count(grp_start, iop_chan, 0); |
| 1322 | iop_desc_set_dest_addr(grp_start, iop_chan, 0); |
| 1323 | iop_desc_set_memcpy_src_addr(grp_start, 0); |
| 1324 | |
| 1325 | cookie = iop_chan->common.cookie; |
| 1326 | cookie++; |
| 1327 | if (cookie <= 1) |
| 1328 | cookie = 2; |
| 1329 | |
| 1330 | /* initialize the completed cookie to be less than |
| 1331 | * the most recently used cookie |
| 1332 | */ |
| 1333 | iop_chan->completed_cookie = cookie - 1; |
| 1334 | iop_chan->common.cookie = sw_desc->async_tx.cookie = cookie; |
| 1335 | |
| 1336 | /* channel should not be busy */ |
| 1337 | BUG_ON(iop_chan_is_busy(iop_chan)); |
| 1338 | |
| 1339 | /* clear any prior error-status bits */ |
| 1340 | iop_adma_device_clear_err_status(iop_chan); |
| 1341 | |
| 1342 | /* disable operation */ |
| 1343 | iop_chan_disable(iop_chan); |
| 1344 | |
| 1345 | /* set the descriptor address */ |
| 1346 | iop_chan_set_next_descriptor(iop_chan, sw_desc->async_tx.phys); |
| 1347 | |
| 1348 | /* 1/ don't add pre-chained descriptors |
| 1349 | * 2/ dummy read to flush next_desc write |
| 1350 | */ |
| 1351 | BUG_ON(iop_desc_get_next_desc(sw_desc)); |
| 1352 | |
| 1353 | /* run the descriptor */ |
| 1354 | iop_chan_enable(iop_chan); |
| 1355 | } else |
| 1356 | dev_printk(KERN_ERR, iop_chan->device->common.dev, |
| 1357 | "failed to allocate null descriptor\n"); |
| 1358 | spin_unlock_bh(&iop_chan->lock); |
| 1359 | } |
| 1360 | |
| 1361 | static void iop_chan_start_null_xor(struct iop_adma_chan *iop_chan) |
| 1362 | { |
| 1363 | struct iop_adma_desc_slot *sw_desc, *grp_start; |
| 1364 | dma_cookie_t cookie; |
| 1365 | int slot_cnt, slots_per_op; |
| 1366 | |
Harvey Harrison | 3d9b525 | 2008-03-13 17:45:28 -0700 | [diff] [blame] | 1367 | dev_dbg(iop_chan->device->common.dev, "%s\n", __func__); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 1368 | |
| 1369 | spin_lock_bh(&iop_chan->lock); |
| 1370 | slot_cnt = iop_chan_xor_slot_count(0, 2, &slots_per_op); |
| 1371 | sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); |
| 1372 | if (sw_desc) { |
| 1373 | grp_start = sw_desc->group_head; |
| 1374 | list_splice_init(&sw_desc->async_tx.tx_list, &iop_chan->chain); |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 1375 | async_tx_ack(&sw_desc->async_tx); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 1376 | iop_desc_init_null_xor(grp_start, 2, 0); |
| 1377 | iop_desc_set_byte_count(grp_start, iop_chan, 0); |
| 1378 | iop_desc_set_dest_addr(grp_start, iop_chan, 0); |
| 1379 | iop_desc_set_xor_src_addr(grp_start, 0, 0); |
| 1380 | iop_desc_set_xor_src_addr(grp_start, 1, 0); |
| 1381 | |
| 1382 | cookie = iop_chan->common.cookie; |
| 1383 | cookie++; |
| 1384 | if (cookie <= 1) |
| 1385 | cookie = 2; |
| 1386 | |
| 1387 | /* initialize the completed cookie to be less than |
| 1388 | * the most recently used cookie |
| 1389 | */ |
| 1390 | iop_chan->completed_cookie = cookie - 1; |
| 1391 | iop_chan->common.cookie = sw_desc->async_tx.cookie = cookie; |
| 1392 | |
| 1393 | /* channel should not be busy */ |
| 1394 | BUG_ON(iop_chan_is_busy(iop_chan)); |
| 1395 | |
| 1396 | /* clear any prior error-status bits */ |
| 1397 | iop_adma_device_clear_err_status(iop_chan); |
| 1398 | |
| 1399 | /* disable operation */ |
| 1400 | iop_chan_disable(iop_chan); |
| 1401 | |
| 1402 | /* set the descriptor address */ |
| 1403 | iop_chan_set_next_descriptor(iop_chan, sw_desc->async_tx.phys); |
| 1404 | |
| 1405 | /* 1/ don't add pre-chained descriptors |
| 1406 | * 2/ dummy read to flush next_desc write |
| 1407 | */ |
| 1408 | BUG_ON(iop_desc_get_next_desc(sw_desc)); |
| 1409 | |
| 1410 | /* run the descriptor */ |
| 1411 | iop_chan_enable(iop_chan); |
| 1412 | } else |
| 1413 | dev_printk(KERN_ERR, iop_chan->device->common.dev, |
| 1414 | "failed to allocate null descriptor\n"); |
| 1415 | spin_unlock_bh(&iop_chan->lock); |
| 1416 | } |
| 1417 | |
Kay Sievers | ebabe27 | 2008-07-08 11:58:28 -0700 | [diff] [blame] | 1418 | MODULE_ALIAS("platform:iop-adma"); |
| 1419 | |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 1420 | static struct platform_driver iop_adma_driver = { |
| 1421 | .probe = iop_adma_probe, |
| 1422 | .remove = iop_adma_remove, |
| 1423 | .driver = { |
| 1424 | .owner = THIS_MODULE, |
| 1425 | .name = "iop-adma", |
| 1426 | }, |
| 1427 | }; |
| 1428 | |
| 1429 | static int __init iop_adma_init (void) |
| 1430 | { |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 1431 | return platform_driver_register(&iop_adma_driver); |
| 1432 | } |
| 1433 | |
Rusty Russell | af49d92 | 2007-10-16 23:26:27 -0700 | [diff] [blame] | 1434 | /* it's currently unsafe to unload this module */ |
| 1435 | #if 0 |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 1436 | static void __exit iop_adma_exit (void) |
| 1437 | { |
| 1438 | platform_driver_unregister(&iop_adma_driver); |
| 1439 | return; |
| 1440 | } |
Rusty Russell | af49d92 | 2007-10-16 23:26:27 -0700 | [diff] [blame] | 1441 | module_exit(iop_adma_exit); |
| 1442 | #endif |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 1443 | |
| 1444 | module_init(iop_adma_init); |
Dan Williams | c211092 | 2007-01-02 13:52:26 -0700 | [diff] [blame] | 1445 | |
| 1446 | MODULE_AUTHOR("Intel Corporation"); |
| 1447 | MODULE_DESCRIPTION("IOP ADMA Engine Driver"); |
| 1448 | MODULE_LICENSE("GPL"); |