Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2017 Broadcom |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | */ |
| 8 | |
| 9 | /* |
| 10 | * Broadcom SBA RAID Driver |
| 11 | * |
| 12 | * The Broadcom stream buffer accelerator (SBA) provides offloading |
| 13 | * capabilities for RAID operations. The SBA offload engine is accessible |
| 14 | * via Broadcom SoC specific ring manager. Two or more offload engines |
| 15 | * can share same Broadcom SoC specific ring manager due to this Broadcom |
| 16 | * SoC specific ring manager driver is implemented as a mailbox controller |
| 17 | * driver and offload engine drivers are implemented as mallbox clients. |
| 18 | * |
| 19 | * Typically, Broadcom SoC specific ring manager will implement larger |
| 20 | * number of hardware rings over one or more SBA hardware devices. By |
| 21 | * design, the internal buffer size of SBA hardware device is limited |
| 22 | * but all offload operations supported by SBA can be broken down into |
| 23 | * multiple small size requests and executed parallely on multiple SBA |
| 24 | * hardware devices for achieving high through-put. |
| 25 | * |
| 26 | * The Broadcom SBA RAID driver does not require any register programming |
| 27 | * except submitting request to SBA hardware device via mailbox channels. |
| 28 | * This driver implements a DMA device with one DMA channel using a set |
| 29 | * of mailbox channels provided by Broadcom SoC specific ring manager |
| 30 | * driver. To exploit parallelism (as described above), all DMA request |
| 31 | * coming to SBA RAID DMA channel are broken down to smaller requests |
| 32 | * and submitted to multiple mailbox channels in round-robin fashion. |
| 33 | * For having more SBA DMA channels, we can create more SBA device nodes |
| 34 | * in Broadcom SoC specific DTS based on number of hardware rings supported |
| 35 | * by Broadcom SoC ring manager. |
| 36 | */ |
| 37 | |
| 38 | #include <linux/bitops.h> |
| 39 | #include <linux/dma-mapping.h> |
| 40 | #include <linux/dmaengine.h> |
| 41 | #include <linux/list.h> |
| 42 | #include <linux/mailbox_client.h> |
| 43 | #include <linux/mailbox/brcm-message.h> |
| 44 | #include <linux/module.h> |
| 45 | #include <linux/of_device.h> |
| 46 | #include <linux/slab.h> |
| 47 | #include <linux/raid/pq.h> |
| 48 | |
| 49 | #include "dmaengine.h" |
| 50 | |
Anup Patel | e897091 | 2017-08-22 15:26:50 +0530 | [diff] [blame] | 51 | /* ====== Driver macros and defines ===== */ |
| 52 | |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 53 | #define SBA_TYPE_SHIFT 48 |
| 54 | #define SBA_TYPE_MASK GENMASK(1, 0) |
| 55 | #define SBA_TYPE_A 0x0 |
| 56 | #define SBA_TYPE_B 0x2 |
| 57 | #define SBA_TYPE_C 0x3 |
| 58 | #define SBA_USER_DEF_SHIFT 32 |
| 59 | #define SBA_USER_DEF_MASK GENMASK(15, 0) |
| 60 | #define SBA_R_MDATA_SHIFT 24 |
| 61 | #define SBA_R_MDATA_MASK GENMASK(7, 0) |
| 62 | #define SBA_C_MDATA_MS_SHIFT 18 |
| 63 | #define SBA_C_MDATA_MS_MASK GENMASK(1, 0) |
| 64 | #define SBA_INT_SHIFT 17 |
| 65 | #define SBA_INT_MASK BIT(0) |
| 66 | #define SBA_RESP_SHIFT 16 |
| 67 | #define SBA_RESP_MASK BIT(0) |
| 68 | #define SBA_C_MDATA_SHIFT 8 |
| 69 | #define SBA_C_MDATA_MASK GENMASK(7, 0) |
| 70 | #define SBA_C_MDATA_BNUMx_SHIFT(__bnum) (2 * (__bnum)) |
| 71 | #define SBA_C_MDATA_BNUMx_MASK GENMASK(1, 0) |
| 72 | #define SBA_C_MDATA_DNUM_SHIFT 5 |
| 73 | #define SBA_C_MDATA_DNUM_MASK GENMASK(4, 0) |
| 74 | #define SBA_C_MDATA_LS(__v) ((__v) & 0xff) |
| 75 | #define SBA_C_MDATA_MS(__v) (((__v) >> 8) & 0x3) |
| 76 | #define SBA_CMD_SHIFT 0 |
| 77 | #define SBA_CMD_MASK GENMASK(3, 0) |
| 78 | #define SBA_CMD_ZERO_BUFFER 0x4 |
| 79 | #define SBA_CMD_ZERO_ALL_BUFFERS 0x8 |
| 80 | #define SBA_CMD_LOAD_BUFFER 0x9 |
| 81 | #define SBA_CMD_XOR 0xa |
| 82 | #define SBA_CMD_GALOIS_XOR 0xb |
| 83 | #define SBA_CMD_WRITE_BUFFER 0xc |
| 84 | #define SBA_CMD_GALOIS 0xe |
| 85 | |
| 86 | /* Driver helper macros */ |
| 87 | #define to_sba_request(tx) \ |
| 88 | container_of(tx, struct sba_request, tx) |
| 89 | #define to_sba_device(dchan) \ |
| 90 | container_of(dchan, struct sba_device, dma_chan) |
| 91 | |
Anup Patel | e897091 | 2017-08-22 15:26:50 +0530 | [diff] [blame] | 92 | /* ===== Driver data structures ===== */ |
| 93 | |
Anup Patel | 57a2850 | 2017-08-22 15:26:52 +0530 | [diff] [blame] | 94 | enum sba_request_flags { |
| 95 | SBA_REQUEST_STATE_FREE = 0x001, |
| 96 | SBA_REQUEST_STATE_ALLOCED = 0x002, |
| 97 | SBA_REQUEST_STATE_PENDING = 0x004, |
| 98 | SBA_REQUEST_STATE_ACTIVE = 0x008, |
| 99 | SBA_REQUEST_STATE_RECEIVED = 0x010, |
| 100 | SBA_REQUEST_STATE_COMPLETED = 0x020, |
| 101 | SBA_REQUEST_STATE_ABORTED = 0x040, |
| 102 | SBA_REQUEST_STATE_MASK = 0x0ff, |
| 103 | SBA_REQUEST_FENCE = 0x100, |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 104 | }; |
| 105 | |
| 106 | struct sba_request { |
| 107 | /* Global state */ |
| 108 | struct list_head node; |
| 109 | struct sba_device *sba; |
Anup Patel | 57a2850 | 2017-08-22 15:26:52 +0530 | [diff] [blame] | 110 | u32 flags; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 111 | /* Chained requests management */ |
| 112 | struct sba_request *first; |
| 113 | struct list_head next; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 114 | atomic_t next_pending_count; |
| 115 | /* BRCM message data */ |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 116 | struct brcm_sba_command *cmds; |
| 117 | struct brcm_message msg; |
| 118 | struct dma_async_tx_descriptor tx; |
| 119 | }; |
| 120 | |
| 121 | enum sba_version { |
| 122 | SBA_VER_1 = 0, |
| 123 | SBA_VER_2 |
| 124 | }; |
| 125 | |
| 126 | struct sba_device { |
| 127 | /* Underlying device */ |
| 128 | struct device *dev; |
| 129 | /* DT configuration parameters */ |
| 130 | enum sba_version ver; |
| 131 | /* Derived configuration parameters */ |
| 132 | u32 max_req; |
| 133 | u32 hw_buf_size; |
| 134 | u32 hw_resp_size; |
| 135 | u32 max_pq_coefs; |
| 136 | u32 max_pq_srcs; |
| 137 | u32 max_cmd_per_req; |
| 138 | u32 max_xor_srcs; |
| 139 | u32 max_resp_pool_size; |
| 140 | u32 max_cmds_pool_size; |
| 141 | /* Maibox client and Mailbox channels */ |
| 142 | struct mbox_client client; |
| 143 | int mchans_count; |
| 144 | atomic_t mchans_current; |
| 145 | struct mbox_chan **mchans; |
| 146 | struct device *mbox_dev; |
| 147 | /* DMA device and DMA channel */ |
| 148 | struct dma_device dma_dev; |
| 149 | struct dma_chan dma_chan; |
| 150 | /* DMA channel resources */ |
| 151 | void *resp_base; |
| 152 | dma_addr_t resp_dma_base; |
| 153 | void *cmds_base; |
| 154 | dma_addr_t cmds_dma_base; |
| 155 | spinlock_t reqs_lock; |
| 156 | struct sba_request *reqs; |
| 157 | bool reqs_fence; |
| 158 | struct list_head reqs_alloc_list; |
| 159 | struct list_head reqs_pending_list; |
| 160 | struct list_head reqs_active_list; |
| 161 | struct list_head reqs_received_list; |
| 162 | struct list_head reqs_completed_list; |
| 163 | struct list_head reqs_aborted_list; |
| 164 | struct list_head reqs_free_list; |
| 165 | int reqs_free_count; |
| 166 | }; |
| 167 | |
Anup Patel | e897091 | 2017-08-22 15:26:50 +0530 | [diff] [blame] | 168 | /* ====== Command helper routines ===== */ |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 169 | |
| 170 | static inline u64 __pure sba_cmd_enc(u64 cmd, u32 val, u32 shift, u32 mask) |
| 171 | { |
| 172 | cmd &= ~((u64)mask << shift); |
| 173 | cmd |= ((u64)(val & mask) << shift); |
| 174 | return cmd; |
| 175 | } |
| 176 | |
| 177 | static inline u32 __pure sba_cmd_load_c_mdata(u32 b0) |
| 178 | { |
| 179 | return b0 & SBA_C_MDATA_BNUMx_MASK; |
| 180 | } |
| 181 | |
| 182 | static inline u32 __pure sba_cmd_write_c_mdata(u32 b0) |
| 183 | { |
| 184 | return b0 & SBA_C_MDATA_BNUMx_MASK; |
| 185 | } |
| 186 | |
| 187 | static inline u32 __pure sba_cmd_xor_c_mdata(u32 b1, u32 b0) |
| 188 | { |
| 189 | return (b0 & SBA_C_MDATA_BNUMx_MASK) | |
| 190 | ((b1 & SBA_C_MDATA_BNUMx_MASK) << SBA_C_MDATA_BNUMx_SHIFT(1)); |
| 191 | } |
| 192 | |
| 193 | static inline u32 __pure sba_cmd_pq_c_mdata(u32 d, u32 b1, u32 b0) |
| 194 | { |
| 195 | return (b0 & SBA_C_MDATA_BNUMx_MASK) | |
| 196 | ((b1 & SBA_C_MDATA_BNUMx_MASK) << SBA_C_MDATA_BNUMx_SHIFT(1)) | |
| 197 | ((d & SBA_C_MDATA_DNUM_MASK) << SBA_C_MDATA_DNUM_SHIFT); |
| 198 | } |
| 199 | |
Anup Patel | e897091 | 2017-08-22 15:26:50 +0530 | [diff] [blame] | 200 | /* ====== General helper routines ===== */ |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 201 | |
| 202 | static struct sba_request *sba_alloc_request(struct sba_device *sba) |
| 203 | { |
| 204 | unsigned long flags; |
| 205 | struct sba_request *req = NULL; |
| 206 | |
| 207 | spin_lock_irqsave(&sba->reqs_lock, flags); |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 208 | req = list_first_entry_or_null(&sba->reqs_free_list, |
| 209 | struct sba_request, node); |
| 210 | if (req) { |
| 211 | list_move_tail(&req->node, &sba->reqs_alloc_list); |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 212 | sba->reqs_free_count--; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 213 | } |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 214 | spin_unlock_irqrestore(&sba->reqs_lock, flags); |
Anup Patel | e4274cf | 2017-08-22 15:26:51 +0530 | [diff] [blame] | 215 | if (!req) |
| 216 | return NULL; |
| 217 | |
Anup Patel | 57a2850 | 2017-08-22 15:26:52 +0530 | [diff] [blame] | 218 | req->flags = SBA_REQUEST_STATE_ALLOCED; |
Anup Patel | e4274cf | 2017-08-22 15:26:51 +0530 | [diff] [blame] | 219 | req->first = req; |
| 220 | INIT_LIST_HEAD(&req->next); |
Anup Patel | e4274cf | 2017-08-22 15:26:51 +0530 | [diff] [blame] | 221 | atomic_set(&req->next_pending_count, 1); |
| 222 | |
| 223 | dma_async_tx_descriptor_init(&req->tx, &sba->dma_chan); |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 224 | |
| 225 | return req; |
| 226 | } |
| 227 | |
| 228 | /* Note: Must be called with sba->reqs_lock held */ |
| 229 | static void _sba_pending_request(struct sba_device *sba, |
| 230 | struct sba_request *req) |
| 231 | { |
| 232 | lockdep_assert_held(&sba->reqs_lock); |
Anup Patel | 57a2850 | 2017-08-22 15:26:52 +0530 | [diff] [blame] | 233 | req->flags &= ~SBA_REQUEST_STATE_MASK; |
| 234 | req->flags |= SBA_REQUEST_STATE_PENDING; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 235 | list_move_tail(&req->node, &sba->reqs_pending_list); |
| 236 | if (list_empty(&sba->reqs_active_list)) |
| 237 | sba->reqs_fence = false; |
| 238 | } |
| 239 | |
| 240 | /* Note: Must be called with sba->reqs_lock held */ |
| 241 | static bool _sba_active_request(struct sba_device *sba, |
| 242 | struct sba_request *req) |
| 243 | { |
| 244 | lockdep_assert_held(&sba->reqs_lock); |
| 245 | if (list_empty(&sba->reqs_active_list)) |
| 246 | sba->reqs_fence = false; |
| 247 | if (sba->reqs_fence) |
| 248 | return false; |
Anup Patel | 57a2850 | 2017-08-22 15:26:52 +0530 | [diff] [blame] | 249 | req->flags &= ~SBA_REQUEST_STATE_MASK; |
| 250 | req->flags |= SBA_REQUEST_STATE_ACTIVE; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 251 | list_move_tail(&req->node, &sba->reqs_active_list); |
Anup Patel | 57a2850 | 2017-08-22 15:26:52 +0530 | [diff] [blame] | 252 | if (req->flags & SBA_REQUEST_FENCE) |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 253 | sba->reqs_fence = true; |
| 254 | return true; |
| 255 | } |
| 256 | |
| 257 | /* Note: Must be called with sba->reqs_lock held */ |
| 258 | static void _sba_abort_request(struct sba_device *sba, |
| 259 | struct sba_request *req) |
| 260 | { |
| 261 | lockdep_assert_held(&sba->reqs_lock); |
Anup Patel | 57a2850 | 2017-08-22 15:26:52 +0530 | [diff] [blame] | 262 | req->flags &= ~SBA_REQUEST_STATE_MASK; |
| 263 | req->flags |= SBA_REQUEST_STATE_ABORTED; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 264 | list_move_tail(&req->node, &sba->reqs_aborted_list); |
| 265 | if (list_empty(&sba->reqs_active_list)) |
| 266 | sba->reqs_fence = false; |
| 267 | } |
| 268 | |
| 269 | /* Note: Must be called with sba->reqs_lock held */ |
| 270 | static void _sba_free_request(struct sba_device *sba, |
| 271 | struct sba_request *req) |
| 272 | { |
| 273 | lockdep_assert_held(&sba->reqs_lock); |
Anup Patel | 57a2850 | 2017-08-22 15:26:52 +0530 | [diff] [blame] | 274 | req->flags &= ~SBA_REQUEST_STATE_MASK; |
| 275 | req->flags |= SBA_REQUEST_STATE_FREE; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 276 | list_move_tail(&req->node, &sba->reqs_free_list); |
| 277 | if (list_empty(&sba->reqs_active_list)) |
| 278 | sba->reqs_fence = false; |
| 279 | sba->reqs_free_count++; |
| 280 | } |
| 281 | |
| 282 | static void sba_received_request(struct sba_request *req) |
| 283 | { |
| 284 | unsigned long flags; |
| 285 | struct sba_device *sba = req->sba; |
| 286 | |
| 287 | spin_lock_irqsave(&sba->reqs_lock, flags); |
Anup Patel | 57a2850 | 2017-08-22 15:26:52 +0530 | [diff] [blame] | 288 | req->flags &= ~SBA_REQUEST_STATE_MASK; |
| 289 | req->flags |= SBA_REQUEST_STATE_RECEIVED; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 290 | list_move_tail(&req->node, &sba->reqs_received_list); |
| 291 | spin_unlock_irqrestore(&sba->reqs_lock, flags); |
| 292 | } |
| 293 | |
| 294 | static void sba_complete_chained_requests(struct sba_request *req) |
| 295 | { |
| 296 | unsigned long flags; |
| 297 | struct sba_request *nreq; |
| 298 | struct sba_device *sba = req->sba; |
| 299 | |
| 300 | spin_lock_irqsave(&sba->reqs_lock, flags); |
| 301 | |
Anup Patel | 57a2850 | 2017-08-22 15:26:52 +0530 | [diff] [blame] | 302 | req->flags &= ~SBA_REQUEST_STATE_MASK; |
| 303 | req->flags |= SBA_REQUEST_STATE_COMPLETED; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 304 | list_move_tail(&req->node, &sba->reqs_completed_list); |
| 305 | list_for_each_entry(nreq, &req->next, next) { |
Anup Patel | 57a2850 | 2017-08-22 15:26:52 +0530 | [diff] [blame] | 306 | nreq->flags &= ~SBA_REQUEST_STATE_MASK; |
| 307 | nreq->flags |= SBA_REQUEST_STATE_COMPLETED; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 308 | list_move_tail(&nreq->node, &sba->reqs_completed_list); |
| 309 | } |
| 310 | if (list_empty(&sba->reqs_active_list)) |
| 311 | sba->reqs_fence = false; |
| 312 | |
| 313 | spin_unlock_irqrestore(&sba->reqs_lock, flags); |
| 314 | } |
| 315 | |
| 316 | static void sba_free_chained_requests(struct sba_request *req) |
| 317 | { |
| 318 | unsigned long flags; |
| 319 | struct sba_request *nreq; |
| 320 | struct sba_device *sba = req->sba; |
| 321 | |
| 322 | spin_lock_irqsave(&sba->reqs_lock, flags); |
| 323 | |
| 324 | _sba_free_request(sba, req); |
| 325 | list_for_each_entry(nreq, &req->next, next) |
| 326 | _sba_free_request(sba, nreq); |
| 327 | |
| 328 | spin_unlock_irqrestore(&sba->reqs_lock, flags); |
| 329 | } |
| 330 | |
| 331 | static void sba_chain_request(struct sba_request *first, |
| 332 | struct sba_request *req) |
| 333 | { |
| 334 | unsigned long flags; |
| 335 | struct sba_device *sba = req->sba; |
| 336 | |
| 337 | spin_lock_irqsave(&sba->reqs_lock, flags); |
| 338 | |
| 339 | list_add_tail(&req->next, &first->next); |
| 340 | req->first = first; |
Anup Patel | 10f1a33 | 2017-08-22 15:26:53 +0530 | [diff] [blame] | 341 | atomic_inc(&first->next_pending_count); |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 342 | |
| 343 | spin_unlock_irqrestore(&sba->reqs_lock, flags); |
| 344 | } |
| 345 | |
| 346 | static void sba_cleanup_nonpending_requests(struct sba_device *sba) |
| 347 | { |
| 348 | unsigned long flags; |
| 349 | struct sba_request *req, *req1; |
| 350 | |
| 351 | spin_lock_irqsave(&sba->reqs_lock, flags); |
| 352 | |
| 353 | /* Freeup all alloced request */ |
| 354 | list_for_each_entry_safe(req, req1, &sba->reqs_alloc_list, node) |
| 355 | _sba_free_request(sba, req); |
| 356 | |
| 357 | /* Freeup all received request */ |
| 358 | list_for_each_entry_safe(req, req1, &sba->reqs_received_list, node) |
| 359 | _sba_free_request(sba, req); |
| 360 | |
| 361 | /* Freeup all completed request */ |
| 362 | list_for_each_entry_safe(req, req1, &sba->reqs_completed_list, node) |
| 363 | _sba_free_request(sba, req); |
| 364 | |
| 365 | /* Set all active requests as aborted */ |
| 366 | list_for_each_entry_safe(req, req1, &sba->reqs_active_list, node) |
| 367 | _sba_abort_request(sba, req); |
| 368 | |
| 369 | /* |
| 370 | * Note: We expect that aborted request will be eventually |
| 371 | * freed by sba_receive_message() |
| 372 | */ |
| 373 | |
| 374 | spin_unlock_irqrestore(&sba->reqs_lock, flags); |
| 375 | } |
| 376 | |
| 377 | static void sba_cleanup_pending_requests(struct sba_device *sba) |
| 378 | { |
| 379 | unsigned long flags; |
| 380 | struct sba_request *req, *req1; |
| 381 | |
| 382 | spin_lock_irqsave(&sba->reqs_lock, flags); |
| 383 | |
| 384 | /* Freeup all pending request */ |
| 385 | list_for_each_entry_safe(req, req1, &sba->reqs_pending_list, node) |
| 386 | _sba_free_request(sba, req); |
| 387 | |
| 388 | spin_unlock_irqrestore(&sba->reqs_lock, flags); |
| 389 | } |
| 390 | |
| 391 | /* ====== DMAENGINE callbacks ===== */ |
| 392 | |
| 393 | static void sba_free_chan_resources(struct dma_chan *dchan) |
| 394 | { |
| 395 | /* |
| 396 | * Channel resources are pre-alloced so we just free-up |
| 397 | * whatever we can so that we can re-use pre-alloced |
| 398 | * channel resources next time. |
| 399 | */ |
| 400 | sba_cleanup_nonpending_requests(to_sba_device(dchan)); |
| 401 | } |
| 402 | |
| 403 | static int sba_device_terminate_all(struct dma_chan *dchan) |
| 404 | { |
| 405 | /* Cleanup all pending requests */ |
| 406 | sba_cleanup_pending_requests(to_sba_device(dchan)); |
| 407 | |
| 408 | return 0; |
| 409 | } |
| 410 | |
| 411 | static int sba_send_mbox_request(struct sba_device *sba, |
| 412 | struct sba_request *req) |
| 413 | { |
| 414 | int mchans_idx, ret = 0; |
| 415 | |
| 416 | /* Select mailbox channel in round-robin fashion */ |
| 417 | mchans_idx = atomic_inc_return(&sba->mchans_current); |
| 418 | mchans_idx = mchans_idx % sba->mchans_count; |
| 419 | |
| 420 | /* Send message for the request */ |
| 421 | req->msg.error = 0; |
| 422 | ret = mbox_send_message(sba->mchans[mchans_idx], &req->msg); |
| 423 | if (ret < 0) { |
| 424 | dev_err(sba->dev, "send message failed with error %d", ret); |
| 425 | return ret; |
| 426 | } |
| 427 | ret = req->msg.error; |
| 428 | if (ret < 0) { |
| 429 | dev_err(sba->dev, "message error %d", ret); |
| 430 | return ret; |
| 431 | } |
| 432 | |
| 433 | return 0; |
| 434 | } |
| 435 | |
| 436 | static void sba_issue_pending(struct dma_chan *dchan) |
| 437 | { |
| 438 | int ret; |
| 439 | unsigned long flags; |
| 440 | struct sba_request *req, *req1; |
| 441 | struct sba_device *sba = to_sba_device(dchan); |
| 442 | |
| 443 | spin_lock_irqsave(&sba->reqs_lock, flags); |
| 444 | |
| 445 | /* Process all pending request */ |
| 446 | list_for_each_entry_safe(req, req1, &sba->reqs_pending_list, node) { |
| 447 | /* Try to make request active */ |
| 448 | if (!_sba_active_request(sba, req)) |
| 449 | break; |
| 450 | |
| 451 | /* Send request to mailbox channel */ |
| 452 | spin_unlock_irqrestore(&sba->reqs_lock, flags); |
| 453 | ret = sba_send_mbox_request(sba, req); |
| 454 | spin_lock_irqsave(&sba->reqs_lock, flags); |
| 455 | |
| 456 | /* If something went wrong then keep request pending */ |
| 457 | if (ret < 0) { |
| 458 | _sba_pending_request(sba, req); |
| 459 | break; |
| 460 | } |
| 461 | } |
| 462 | |
| 463 | spin_unlock_irqrestore(&sba->reqs_lock, flags); |
| 464 | } |
| 465 | |
| 466 | static dma_cookie_t sba_tx_submit(struct dma_async_tx_descriptor *tx) |
| 467 | { |
| 468 | unsigned long flags; |
| 469 | dma_cookie_t cookie; |
| 470 | struct sba_device *sba; |
| 471 | struct sba_request *req, *nreq; |
| 472 | |
| 473 | if (unlikely(!tx)) |
| 474 | return -EINVAL; |
| 475 | |
| 476 | sba = to_sba_device(tx->chan); |
| 477 | req = to_sba_request(tx); |
| 478 | |
| 479 | /* Assign cookie and mark all chained requests pending */ |
| 480 | spin_lock_irqsave(&sba->reqs_lock, flags); |
| 481 | cookie = dma_cookie_assign(tx); |
| 482 | _sba_pending_request(sba, req); |
| 483 | list_for_each_entry(nreq, &req->next, next) |
| 484 | _sba_pending_request(sba, nreq); |
| 485 | spin_unlock_irqrestore(&sba->reqs_lock, flags); |
| 486 | |
| 487 | return cookie; |
| 488 | } |
| 489 | |
| 490 | static enum dma_status sba_tx_status(struct dma_chan *dchan, |
| 491 | dma_cookie_t cookie, |
| 492 | struct dma_tx_state *txstate) |
| 493 | { |
| 494 | int mchan_idx; |
| 495 | enum dma_status ret; |
| 496 | struct sba_device *sba = to_sba_device(dchan); |
| 497 | |
| 498 | for (mchan_idx = 0; mchan_idx < sba->mchans_count; mchan_idx++) |
| 499 | mbox_client_peek_data(sba->mchans[mchan_idx]); |
| 500 | |
| 501 | ret = dma_cookie_status(dchan, cookie, txstate); |
| 502 | if (ret == DMA_COMPLETE) |
| 503 | return ret; |
| 504 | |
| 505 | return dma_cookie_status(dchan, cookie, txstate); |
| 506 | } |
| 507 | |
| 508 | static void sba_fillup_interrupt_msg(struct sba_request *req, |
| 509 | struct brcm_sba_command *cmds, |
| 510 | struct brcm_message *msg) |
| 511 | { |
| 512 | u64 cmd; |
| 513 | u32 c_mdata; |
Anup Patel | e7ae72a | 2017-08-22 15:26:54 +0530 | [diff] [blame^] | 514 | dma_addr_t resp_dma = req->tx.phys; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 515 | struct brcm_sba_command *cmdsp = cmds; |
| 516 | |
| 517 | /* Type-B command to load dummy data into buf0 */ |
| 518 | cmd = sba_cmd_enc(0x0, SBA_TYPE_B, |
| 519 | SBA_TYPE_SHIFT, SBA_TYPE_MASK); |
| 520 | cmd = sba_cmd_enc(cmd, req->sba->hw_resp_size, |
| 521 | SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); |
| 522 | c_mdata = sba_cmd_load_c_mdata(0); |
| 523 | cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), |
| 524 | SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); |
| 525 | cmd = sba_cmd_enc(cmd, SBA_CMD_LOAD_BUFFER, |
| 526 | SBA_CMD_SHIFT, SBA_CMD_MASK); |
| 527 | cmdsp->cmd = cmd; |
| 528 | *cmdsp->cmd_dma = cpu_to_le64(cmd); |
| 529 | cmdsp->flags = BRCM_SBA_CMD_TYPE_B; |
Anup Patel | e7ae72a | 2017-08-22 15:26:54 +0530 | [diff] [blame^] | 530 | cmdsp->data = resp_dma; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 531 | cmdsp->data_len = req->sba->hw_resp_size; |
| 532 | cmdsp++; |
| 533 | |
| 534 | /* Type-A command to write buf0 to dummy location */ |
| 535 | cmd = sba_cmd_enc(0x0, SBA_TYPE_A, |
| 536 | SBA_TYPE_SHIFT, SBA_TYPE_MASK); |
| 537 | cmd = sba_cmd_enc(cmd, req->sba->hw_resp_size, |
| 538 | SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); |
| 539 | cmd = sba_cmd_enc(cmd, 0x1, |
| 540 | SBA_RESP_SHIFT, SBA_RESP_MASK); |
| 541 | c_mdata = sba_cmd_write_c_mdata(0); |
| 542 | cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), |
| 543 | SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); |
| 544 | cmd = sba_cmd_enc(cmd, SBA_CMD_WRITE_BUFFER, |
| 545 | SBA_CMD_SHIFT, SBA_CMD_MASK); |
| 546 | cmdsp->cmd = cmd; |
| 547 | *cmdsp->cmd_dma = cpu_to_le64(cmd); |
| 548 | cmdsp->flags = BRCM_SBA_CMD_TYPE_A; |
| 549 | if (req->sba->hw_resp_size) { |
| 550 | cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP; |
Anup Patel | e7ae72a | 2017-08-22 15:26:54 +0530 | [diff] [blame^] | 551 | cmdsp->resp = resp_dma; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 552 | cmdsp->resp_len = req->sba->hw_resp_size; |
| 553 | } |
| 554 | cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT; |
Anup Patel | e7ae72a | 2017-08-22 15:26:54 +0530 | [diff] [blame^] | 555 | cmdsp->data = resp_dma; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 556 | cmdsp->data_len = req->sba->hw_resp_size; |
| 557 | cmdsp++; |
| 558 | |
| 559 | /* Fillup brcm_message */ |
| 560 | msg->type = BRCM_MESSAGE_SBA; |
| 561 | msg->sba.cmds = cmds; |
| 562 | msg->sba.cmds_count = cmdsp - cmds; |
| 563 | msg->ctx = req; |
| 564 | msg->error = 0; |
| 565 | } |
| 566 | |
| 567 | static struct dma_async_tx_descriptor * |
| 568 | sba_prep_dma_interrupt(struct dma_chan *dchan, unsigned long flags) |
| 569 | { |
| 570 | struct sba_request *req = NULL; |
| 571 | struct sba_device *sba = to_sba_device(dchan); |
| 572 | |
| 573 | /* Alloc new request */ |
| 574 | req = sba_alloc_request(sba); |
| 575 | if (!req) |
| 576 | return NULL; |
| 577 | |
| 578 | /* |
| 579 | * Force fence so that no requests are submitted |
| 580 | * until DMA callback for this request is invoked. |
| 581 | */ |
Anup Patel | 57a2850 | 2017-08-22 15:26:52 +0530 | [diff] [blame] | 582 | req->flags |= SBA_REQUEST_FENCE; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 583 | |
| 584 | /* Fillup request message */ |
| 585 | sba_fillup_interrupt_msg(req, req->cmds, &req->msg); |
| 586 | |
| 587 | /* Init async_tx descriptor */ |
| 588 | req->tx.flags = flags; |
| 589 | req->tx.cookie = -EBUSY; |
| 590 | |
Colin Ian King | 1fc63cb | 2017-05-17 22:58:50 +0100 | [diff] [blame] | 591 | return &req->tx; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 592 | } |
| 593 | |
| 594 | static void sba_fillup_memcpy_msg(struct sba_request *req, |
| 595 | struct brcm_sba_command *cmds, |
| 596 | struct brcm_message *msg, |
| 597 | dma_addr_t msg_offset, size_t msg_len, |
| 598 | dma_addr_t dst, dma_addr_t src) |
| 599 | { |
| 600 | u64 cmd; |
| 601 | u32 c_mdata; |
Anup Patel | e7ae72a | 2017-08-22 15:26:54 +0530 | [diff] [blame^] | 602 | dma_addr_t resp_dma = req->tx.phys; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 603 | struct brcm_sba_command *cmdsp = cmds; |
| 604 | |
| 605 | /* Type-B command to load data into buf0 */ |
| 606 | cmd = sba_cmd_enc(0x0, SBA_TYPE_B, |
| 607 | SBA_TYPE_SHIFT, SBA_TYPE_MASK); |
| 608 | cmd = sba_cmd_enc(cmd, msg_len, |
| 609 | SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); |
| 610 | c_mdata = sba_cmd_load_c_mdata(0); |
| 611 | cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), |
| 612 | SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); |
| 613 | cmd = sba_cmd_enc(cmd, SBA_CMD_LOAD_BUFFER, |
| 614 | SBA_CMD_SHIFT, SBA_CMD_MASK); |
| 615 | cmdsp->cmd = cmd; |
| 616 | *cmdsp->cmd_dma = cpu_to_le64(cmd); |
| 617 | cmdsp->flags = BRCM_SBA_CMD_TYPE_B; |
| 618 | cmdsp->data = src + msg_offset; |
| 619 | cmdsp->data_len = msg_len; |
| 620 | cmdsp++; |
| 621 | |
| 622 | /* Type-A command to write buf0 */ |
| 623 | cmd = sba_cmd_enc(0x0, SBA_TYPE_A, |
| 624 | SBA_TYPE_SHIFT, SBA_TYPE_MASK); |
| 625 | cmd = sba_cmd_enc(cmd, msg_len, |
| 626 | SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); |
| 627 | cmd = sba_cmd_enc(cmd, 0x1, |
| 628 | SBA_RESP_SHIFT, SBA_RESP_MASK); |
| 629 | c_mdata = sba_cmd_write_c_mdata(0); |
| 630 | cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), |
| 631 | SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); |
| 632 | cmd = sba_cmd_enc(cmd, SBA_CMD_WRITE_BUFFER, |
| 633 | SBA_CMD_SHIFT, SBA_CMD_MASK); |
| 634 | cmdsp->cmd = cmd; |
| 635 | *cmdsp->cmd_dma = cpu_to_le64(cmd); |
| 636 | cmdsp->flags = BRCM_SBA_CMD_TYPE_A; |
| 637 | if (req->sba->hw_resp_size) { |
| 638 | cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP; |
Anup Patel | e7ae72a | 2017-08-22 15:26:54 +0530 | [diff] [blame^] | 639 | cmdsp->resp = resp_dma; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 640 | cmdsp->resp_len = req->sba->hw_resp_size; |
| 641 | } |
| 642 | cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT; |
| 643 | cmdsp->data = dst + msg_offset; |
| 644 | cmdsp->data_len = msg_len; |
| 645 | cmdsp++; |
| 646 | |
| 647 | /* Fillup brcm_message */ |
| 648 | msg->type = BRCM_MESSAGE_SBA; |
| 649 | msg->sba.cmds = cmds; |
| 650 | msg->sba.cmds_count = cmdsp - cmds; |
| 651 | msg->ctx = req; |
| 652 | msg->error = 0; |
| 653 | } |
| 654 | |
| 655 | static struct sba_request * |
| 656 | sba_prep_dma_memcpy_req(struct sba_device *sba, |
| 657 | dma_addr_t off, dma_addr_t dst, dma_addr_t src, |
| 658 | size_t len, unsigned long flags) |
| 659 | { |
| 660 | struct sba_request *req = NULL; |
| 661 | |
| 662 | /* Alloc new request */ |
| 663 | req = sba_alloc_request(sba); |
| 664 | if (!req) |
| 665 | return NULL; |
Anup Patel | 57a2850 | 2017-08-22 15:26:52 +0530 | [diff] [blame] | 666 | if (flags & DMA_PREP_FENCE) |
| 667 | req->flags |= SBA_REQUEST_FENCE; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 668 | |
| 669 | /* Fillup request message */ |
| 670 | sba_fillup_memcpy_msg(req, req->cmds, &req->msg, |
| 671 | off, len, dst, src); |
| 672 | |
| 673 | /* Init async_tx descriptor */ |
| 674 | req->tx.flags = flags; |
| 675 | req->tx.cookie = -EBUSY; |
| 676 | |
| 677 | return req; |
| 678 | } |
| 679 | |
| 680 | static struct dma_async_tx_descriptor * |
| 681 | sba_prep_dma_memcpy(struct dma_chan *dchan, dma_addr_t dst, dma_addr_t src, |
| 682 | size_t len, unsigned long flags) |
| 683 | { |
| 684 | size_t req_len; |
| 685 | dma_addr_t off = 0; |
| 686 | struct sba_device *sba = to_sba_device(dchan); |
| 687 | struct sba_request *first = NULL, *req; |
| 688 | |
| 689 | /* Create chained requests where each request is upto hw_buf_size */ |
| 690 | while (len) { |
| 691 | req_len = (len < sba->hw_buf_size) ? len : sba->hw_buf_size; |
| 692 | |
| 693 | req = sba_prep_dma_memcpy_req(sba, off, dst, src, |
| 694 | req_len, flags); |
| 695 | if (!req) { |
| 696 | if (first) |
| 697 | sba_free_chained_requests(first); |
| 698 | return NULL; |
| 699 | } |
| 700 | |
| 701 | if (first) |
| 702 | sba_chain_request(first, req); |
| 703 | else |
| 704 | first = req; |
| 705 | |
| 706 | off += req_len; |
| 707 | len -= req_len; |
| 708 | } |
| 709 | |
| 710 | return (first) ? &first->tx : NULL; |
| 711 | } |
| 712 | |
| 713 | static void sba_fillup_xor_msg(struct sba_request *req, |
| 714 | struct brcm_sba_command *cmds, |
| 715 | struct brcm_message *msg, |
| 716 | dma_addr_t msg_offset, size_t msg_len, |
| 717 | dma_addr_t dst, dma_addr_t *src, u32 src_cnt) |
| 718 | { |
| 719 | u64 cmd; |
| 720 | u32 c_mdata; |
| 721 | unsigned int i; |
Anup Patel | e7ae72a | 2017-08-22 15:26:54 +0530 | [diff] [blame^] | 722 | dma_addr_t resp_dma = req->tx.phys; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 723 | struct brcm_sba_command *cmdsp = cmds; |
| 724 | |
| 725 | /* Type-B command to load data into buf0 */ |
| 726 | cmd = sba_cmd_enc(0x0, SBA_TYPE_B, |
| 727 | SBA_TYPE_SHIFT, SBA_TYPE_MASK); |
| 728 | cmd = sba_cmd_enc(cmd, msg_len, |
| 729 | SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); |
| 730 | c_mdata = sba_cmd_load_c_mdata(0); |
| 731 | cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), |
| 732 | SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); |
| 733 | cmd = sba_cmd_enc(cmd, SBA_CMD_LOAD_BUFFER, |
| 734 | SBA_CMD_SHIFT, SBA_CMD_MASK); |
| 735 | cmdsp->cmd = cmd; |
| 736 | *cmdsp->cmd_dma = cpu_to_le64(cmd); |
| 737 | cmdsp->flags = BRCM_SBA_CMD_TYPE_B; |
| 738 | cmdsp->data = src[0] + msg_offset; |
| 739 | cmdsp->data_len = msg_len; |
| 740 | cmdsp++; |
| 741 | |
| 742 | /* Type-B commands to xor data with buf0 and put it back in buf0 */ |
| 743 | for (i = 1; i < src_cnt; i++) { |
| 744 | cmd = sba_cmd_enc(0x0, SBA_TYPE_B, |
| 745 | SBA_TYPE_SHIFT, SBA_TYPE_MASK); |
| 746 | cmd = sba_cmd_enc(cmd, msg_len, |
| 747 | SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); |
| 748 | c_mdata = sba_cmd_xor_c_mdata(0, 0); |
| 749 | cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), |
| 750 | SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); |
| 751 | cmd = sba_cmd_enc(cmd, SBA_CMD_XOR, |
| 752 | SBA_CMD_SHIFT, SBA_CMD_MASK); |
| 753 | cmdsp->cmd = cmd; |
| 754 | *cmdsp->cmd_dma = cpu_to_le64(cmd); |
| 755 | cmdsp->flags = BRCM_SBA_CMD_TYPE_B; |
| 756 | cmdsp->data = src[i] + msg_offset; |
| 757 | cmdsp->data_len = msg_len; |
| 758 | cmdsp++; |
| 759 | } |
| 760 | |
| 761 | /* Type-A command to write buf0 */ |
| 762 | cmd = sba_cmd_enc(0x0, SBA_TYPE_A, |
| 763 | SBA_TYPE_SHIFT, SBA_TYPE_MASK); |
| 764 | cmd = sba_cmd_enc(cmd, msg_len, |
| 765 | SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); |
| 766 | cmd = sba_cmd_enc(cmd, 0x1, |
| 767 | SBA_RESP_SHIFT, SBA_RESP_MASK); |
| 768 | c_mdata = sba_cmd_write_c_mdata(0); |
| 769 | cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), |
| 770 | SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); |
| 771 | cmd = sba_cmd_enc(cmd, SBA_CMD_WRITE_BUFFER, |
| 772 | SBA_CMD_SHIFT, SBA_CMD_MASK); |
| 773 | cmdsp->cmd = cmd; |
| 774 | *cmdsp->cmd_dma = cpu_to_le64(cmd); |
| 775 | cmdsp->flags = BRCM_SBA_CMD_TYPE_A; |
| 776 | if (req->sba->hw_resp_size) { |
| 777 | cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP; |
Anup Patel | e7ae72a | 2017-08-22 15:26:54 +0530 | [diff] [blame^] | 778 | cmdsp->resp = resp_dma; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 779 | cmdsp->resp_len = req->sba->hw_resp_size; |
| 780 | } |
| 781 | cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT; |
| 782 | cmdsp->data = dst + msg_offset; |
| 783 | cmdsp->data_len = msg_len; |
| 784 | cmdsp++; |
| 785 | |
| 786 | /* Fillup brcm_message */ |
| 787 | msg->type = BRCM_MESSAGE_SBA; |
| 788 | msg->sba.cmds = cmds; |
| 789 | msg->sba.cmds_count = cmdsp - cmds; |
| 790 | msg->ctx = req; |
| 791 | msg->error = 0; |
| 792 | } |
| 793 | |
Vinod Koul | dd2bceb | 2017-07-19 10:03:24 +0530 | [diff] [blame] | 794 | static struct sba_request * |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 795 | sba_prep_dma_xor_req(struct sba_device *sba, |
| 796 | dma_addr_t off, dma_addr_t dst, dma_addr_t *src, |
| 797 | u32 src_cnt, size_t len, unsigned long flags) |
| 798 | { |
| 799 | struct sba_request *req = NULL; |
| 800 | |
| 801 | /* Alloc new request */ |
| 802 | req = sba_alloc_request(sba); |
| 803 | if (!req) |
| 804 | return NULL; |
Anup Patel | 57a2850 | 2017-08-22 15:26:52 +0530 | [diff] [blame] | 805 | if (flags & DMA_PREP_FENCE) |
| 806 | req->flags |= SBA_REQUEST_FENCE; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 807 | |
| 808 | /* Fillup request message */ |
| 809 | sba_fillup_xor_msg(req, req->cmds, &req->msg, |
| 810 | off, len, dst, src, src_cnt); |
| 811 | |
| 812 | /* Init async_tx descriptor */ |
| 813 | req->tx.flags = flags; |
| 814 | req->tx.cookie = -EBUSY; |
| 815 | |
| 816 | return req; |
| 817 | } |
| 818 | |
| 819 | static struct dma_async_tx_descriptor * |
| 820 | sba_prep_dma_xor(struct dma_chan *dchan, dma_addr_t dst, dma_addr_t *src, |
| 821 | u32 src_cnt, size_t len, unsigned long flags) |
| 822 | { |
| 823 | size_t req_len; |
| 824 | dma_addr_t off = 0; |
| 825 | struct sba_device *sba = to_sba_device(dchan); |
| 826 | struct sba_request *first = NULL, *req; |
| 827 | |
| 828 | /* Sanity checks */ |
| 829 | if (unlikely(src_cnt > sba->max_xor_srcs)) |
| 830 | return NULL; |
| 831 | |
| 832 | /* Create chained requests where each request is upto hw_buf_size */ |
| 833 | while (len) { |
| 834 | req_len = (len < sba->hw_buf_size) ? len : sba->hw_buf_size; |
| 835 | |
| 836 | req = sba_prep_dma_xor_req(sba, off, dst, src, src_cnt, |
| 837 | req_len, flags); |
| 838 | if (!req) { |
| 839 | if (first) |
| 840 | sba_free_chained_requests(first); |
| 841 | return NULL; |
| 842 | } |
| 843 | |
| 844 | if (first) |
| 845 | sba_chain_request(first, req); |
| 846 | else |
| 847 | first = req; |
| 848 | |
| 849 | off += req_len; |
| 850 | len -= req_len; |
| 851 | } |
| 852 | |
| 853 | return (first) ? &first->tx : NULL; |
| 854 | } |
| 855 | |
| 856 | static void sba_fillup_pq_msg(struct sba_request *req, |
| 857 | bool pq_continue, |
| 858 | struct brcm_sba_command *cmds, |
| 859 | struct brcm_message *msg, |
| 860 | dma_addr_t msg_offset, size_t msg_len, |
| 861 | dma_addr_t *dst_p, dma_addr_t *dst_q, |
| 862 | const u8 *scf, dma_addr_t *src, u32 src_cnt) |
| 863 | { |
| 864 | u64 cmd; |
| 865 | u32 c_mdata; |
| 866 | unsigned int i; |
Anup Patel | e7ae72a | 2017-08-22 15:26:54 +0530 | [diff] [blame^] | 867 | dma_addr_t resp_dma = req->tx.phys; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 868 | struct brcm_sba_command *cmdsp = cmds; |
| 869 | |
| 870 | if (pq_continue) { |
| 871 | /* Type-B command to load old P into buf0 */ |
| 872 | if (dst_p) { |
| 873 | cmd = sba_cmd_enc(0x0, SBA_TYPE_B, |
| 874 | SBA_TYPE_SHIFT, SBA_TYPE_MASK); |
| 875 | cmd = sba_cmd_enc(cmd, msg_len, |
| 876 | SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); |
| 877 | c_mdata = sba_cmd_load_c_mdata(0); |
| 878 | cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), |
| 879 | SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); |
| 880 | cmd = sba_cmd_enc(cmd, SBA_CMD_LOAD_BUFFER, |
| 881 | SBA_CMD_SHIFT, SBA_CMD_MASK); |
| 882 | cmdsp->cmd = cmd; |
| 883 | *cmdsp->cmd_dma = cpu_to_le64(cmd); |
| 884 | cmdsp->flags = BRCM_SBA_CMD_TYPE_B; |
| 885 | cmdsp->data = *dst_p + msg_offset; |
| 886 | cmdsp->data_len = msg_len; |
| 887 | cmdsp++; |
| 888 | } |
| 889 | |
| 890 | /* Type-B command to load old Q into buf1 */ |
| 891 | if (dst_q) { |
| 892 | cmd = sba_cmd_enc(0x0, SBA_TYPE_B, |
| 893 | SBA_TYPE_SHIFT, SBA_TYPE_MASK); |
| 894 | cmd = sba_cmd_enc(cmd, msg_len, |
| 895 | SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); |
| 896 | c_mdata = sba_cmd_load_c_mdata(1); |
| 897 | cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), |
| 898 | SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); |
| 899 | cmd = sba_cmd_enc(cmd, SBA_CMD_LOAD_BUFFER, |
| 900 | SBA_CMD_SHIFT, SBA_CMD_MASK); |
| 901 | cmdsp->cmd = cmd; |
| 902 | *cmdsp->cmd_dma = cpu_to_le64(cmd); |
| 903 | cmdsp->flags = BRCM_SBA_CMD_TYPE_B; |
| 904 | cmdsp->data = *dst_q + msg_offset; |
| 905 | cmdsp->data_len = msg_len; |
| 906 | cmdsp++; |
| 907 | } |
| 908 | } else { |
| 909 | /* Type-A command to zero all buffers */ |
| 910 | cmd = sba_cmd_enc(0x0, SBA_TYPE_A, |
| 911 | SBA_TYPE_SHIFT, SBA_TYPE_MASK); |
| 912 | cmd = sba_cmd_enc(cmd, msg_len, |
| 913 | SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); |
| 914 | cmd = sba_cmd_enc(cmd, SBA_CMD_ZERO_ALL_BUFFERS, |
| 915 | SBA_CMD_SHIFT, SBA_CMD_MASK); |
| 916 | cmdsp->cmd = cmd; |
| 917 | *cmdsp->cmd_dma = cpu_to_le64(cmd); |
| 918 | cmdsp->flags = BRCM_SBA_CMD_TYPE_A; |
| 919 | cmdsp++; |
| 920 | } |
| 921 | |
| 922 | /* Type-B commands for generate P onto buf0 and Q onto buf1 */ |
| 923 | for (i = 0; i < src_cnt; i++) { |
| 924 | cmd = sba_cmd_enc(0x0, SBA_TYPE_B, |
| 925 | SBA_TYPE_SHIFT, SBA_TYPE_MASK); |
| 926 | cmd = sba_cmd_enc(cmd, msg_len, |
| 927 | SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); |
| 928 | c_mdata = sba_cmd_pq_c_mdata(raid6_gflog[scf[i]], 1, 0); |
| 929 | cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), |
| 930 | SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); |
| 931 | cmd = sba_cmd_enc(cmd, SBA_C_MDATA_MS(c_mdata), |
| 932 | SBA_C_MDATA_MS_SHIFT, SBA_C_MDATA_MS_MASK); |
| 933 | cmd = sba_cmd_enc(cmd, SBA_CMD_GALOIS_XOR, |
| 934 | SBA_CMD_SHIFT, SBA_CMD_MASK); |
| 935 | cmdsp->cmd = cmd; |
| 936 | *cmdsp->cmd_dma = cpu_to_le64(cmd); |
| 937 | cmdsp->flags = BRCM_SBA_CMD_TYPE_B; |
| 938 | cmdsp->data = src[i] + msg_offset; |
| 939 | cmdsp->data_len = msg_len; |
| 940 | cmdsp++; |
| 941 | } |
| 942 | |
| 943 | /* Type-A command to write buf0 */ |
| 944 | if (dst_p) { |
| 945 | cmd = sba_cmd_enc(0x0, SBA_TYPE_A, |
| 946 | SBA_TYPE_SHIFT, SBA_TYPE_MASK); |
| 947 | cmd = sba_cmd_enc(cmd, msg_len, |
| 948 | SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); |
| 949 | cmd = sba_cmd_enc(cmd, 0x1, |
| 950 | SBA_RESP_SHIFT, SBA_RESP_MASK); |
| 951 | c_mdata = sba_cmd_write_c_mdata(0); |
| 952 | cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), |
| 953 | SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); |
| 954 | cmd = sba_cmd_enc(cmd, SBA_CMD_WRITE_BUFFER, |
| 955 | SBA_CMD_SHIFT, SBA_CMD_MASK); |
| 956 | cmdsp->cmd = cmd; |
| 957 | *cmdsp->cmd_dma = cpu_to_le64(cmd); |
| 958 | cmdsp->flags = BRCM_SBA_CMD_TYPE_A; |
| 959 | if (req->sba->hw_resp_size) { |
| 960 | cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP; |
Anup Patel | e7ae72a | 2017-08-22 15:26:54 +0530 | [diff] [blame^] | 961 | cmdsp->resp = resp_dma; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 962 | cmdsp->resp_len = req->sba->hw_resp_size; |
| 963 | } |
| 964 | cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT; |
| 965 | cmdsp->data = *dst_p + msg_offset; |
| 966 | cmdsp->data_len = msg_len; |
| 967 | cmdsp++; |
| 968 | } |
| 969 | |
| 970 | /* Type-A command to write buf1 */ |
| 971 | if (dst_q) { |
| 972 | cmd = sba_cmd_enc(0x0, SBA_TYPE_A, |
| 973 | SBA_TYPE_SHIFT, SBA_TYPE_MASK); |
| 974 | cmd = sba_cmd_enc(cmd, msg_len, |
| 975 | SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); |
| 976 | cmd = sba_cmd_enc(cmd, 0x1, |
| 977 | SBA_RESP_SHIFT, SBA_RESP_MASK); |
| 978 | c_mdata = sba_cmd_write_c_mdata(1); |
| 979 | cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), |
| 980 | SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); |
| 981 | cmd = sba_cmd_enc(cmd, SBA_CMD_WRITE_BUFFER, |
| 982 | SBA_CMD_SHIFT, SBA_CMD_MASK); |
| 983 | cmdsp->cmd = cmd; |
| 984 | *cmdsp->cmd_dma = cpu_to_le64(cmd); |
| 985 | cmdsp->flags = BRCM_SBA_CMD_TYPE_A; |
| 986 | if (req->sba->hw_resp_size) { |
| 987 | cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP; |
Anup Patel | e7ae72a | 2017-08-22 15:26:54 +0530 | [diff] [blame^] | 988 | cmdsp->resp = resp_dma; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 989 | cmdsp->resp_len = req->sba->hw_resp_size; |
| 990 | } |
| 991 | cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT; |
| 992 | cmdsp->data = *dst_q + msg_offset; |
| 993 | cmdsp->data_len = msg_len; |
| 994 | cmdsp++; |
| 995 | } |
| 996 | |
| 997 | /* Fillup brcm_message */ |
| 998 | msg->type = BRCM_MESSAGE_SBA; |
| 999 | msg->sba.cmds = cmds; |
| 1000 | msg->sba.cmds_count = cmdsp - cmds; |
| 1001 | msg->ctx = req; |
| 1002 | msg->error = 0; |
| 1003 | } |
| 1004 | |
Vinod Koul | dd2bceb | 2017-07-19 10:03:24 +0530 | [diff] [blame] | 1005 | static struct sba_request * |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 1006 | sba_prep_dma_pq_req(struct sba_device *sba, dma_addr_t off, |
| 1007 | dma_addr_t *dst_p, dma_addr_t *dst_q, dma_addr_t *src, |
| 1008 | u32 src_cnt, const u8 *scf, size_t len, unsigned long flags) |
| 1009 | { |
| 1010 | struct sba_request *req = NULL; |
| 1011 | |
| 1012 | /* Alloc new request */ |
| 1013 | req = sba_alloc_request(sba); |
| 1014 | if (!req) |
| 1015 | return NULL; |
Anup Patel | 57a2850 | 2017-08-22 15:26:52 +0530 | [diff] [blame] | 1016 | if (flags & DMA_PREP_FENCE) |
| 1017 | req->flags |= SBA_REQUEST_FENCE; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 1018 | |
| 1019 | /* Fillup request messages */ |
| 1020 | sba_fillup_pq_msg(req, dmaf_continue(flags), |
| 1021 | req->cmds, &req->msg, |
| 1022 | off, len, dst_p, dst_q, scf, src, src_cnt); |
| 1023 | |
| 1024 | /* Init async_tx descriptor */ |
| 1025 | req->tx.flags = flags; |
| 1026 | req->tx.cookie = -EBUSY; |
| 1027 | |
| 1028 | return req; |
| 1029 | } |
| 1030 | |
| 1031 | static void sba_fillup_pq_single_msg(struct sba_request *req, |
| 1032 | bool pq_continue, |
| 1033 | struct brcm_sba_command *cmds, |
| 1034 | struct brcm_message *msg, |
| 1035 | dma_addr_t msg_offset, size_t msg_len, |
| 1036 | dma_addr_t *dst_p, dma_addr_t *dst_q, |
| 1037 | dma_addr_t src, u8 scf) |
| 1038 | { |
| 1039 | u64 cmd; |
| 1040 | u32 c_mdata; |
| 1041 | u8 pos, dpos = raid6_gflog[scf]; |
Anup Patel | e7ae72a | 2017-08-22 15:26:54 +0530 | [diff] [blame^] | 1042 | dma_addr_t resp_dma = req->tx.phys; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 1043 | struct brcm_sba_command *cmdsp = cmds; |
| 1044 | |
| 1045 | if (!dst_p) |
| 1046 | goto skip_p; |
| 1047 | |
| 1048 | if (pq_continue) { |
| 1049 | /* Type-B command to load old P into buf0 */ |
| 1050 | cmd = sba_cmd_enc(0x0, SBA_TYPE_B, |
| 1051 | SBA_TYPE_SHIFT, SBA_TYPE_MASK); |
| 1052 | cmd = sba_cmd_enc(cmd, msg_len, |
| 1053 | SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); |
| 1054 | c_mdata = sba_cmd_load_c_mdata(0); |
| 1055 | cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), |
| 1056 | SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); |
| 1057 | cmd = sba_cmd_enc(cmd, SBA_CMD_LOAD_BUFFER, |
| 1058 | SBA_CMD_SHIFT, SBA_CMD_MASK); |
| 1059 | cmdsp->cmd = cmd; |
| 1060 | *cmdsp->cmd_dma = cpu_to_le64(cmd); |
| 1061 | cmdsp->flags = BRCM_SBA_CMD_TYPE_B; |
| 1062 | cmdsp->data = *dst_p + msg_offset; |
| 1063 | cmdsp->data_len = msg_len; |
| 1064 | cmdsp++; |
| 1065 | |
| 1066 | /* |
| 1067 | * Type-B commands to xor data with buf0 and put it |
| 1068 | * back in buf0 |
| 1069 | */ |
| 1070 | cmd = sba_cmd_enc(0x0, SBA_TYPE_B, |
| 1071 | SBA_TYPE_SHIFT, SBA_TYPE_MASK); |
| 1072 | cmd = sba_cmd_enc(cmd, msg_len, |
| 1073 | SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); |
| 1074 | c_mdata = sba_cmd_xor_c_mdata(0, 0); |
| 1075 | cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), |
| 1076 | SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); |
| 1077 | cmd = sba_cmd_enc(cmd, SBA_CMD_XOR, |
| 1078 | SBA_CMD_SHIFT, SBA_CMD_MASK); |
| 1079 | cmdsp->cmd = cmd; |
| 1080 | *cmdsp->cmd_dma = cpu_to_le64(cmd); |
| 1081 | cmdsp->flags = BRCM_SBA_CMD_TYPE_B; |
| 1082 | cmdsp->data = src + msg_offset; |
| 1083 | cmdsp->data_len = msg_len; |
| 1084 | cmdsp++; |
| 1085 | } else { |
| 1086 | /* Type-B command to load old P into buf0 */ |
| 1087 | cmd = sba_cmd_enc(0x0, SBA_TYPE_B, |
| 1088 | SBA_TYPE_SHIFT, SBA_TYPE_MASK); |
| 1089 | cmd = sba_cmd_enc(cmd, msg_len, |
| 1090 | SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); |
| 1091 | c_mdata = sba_cmd_load_c_mdata(0); |
| 1092 | cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), |
| 1093 | SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); |
| 1094 | cmd = sba_cmd_enc(cmd, SBA_CMD_LOAD_BUFFER, |
| 1095 | SBA_CMD_SHIFT, SBA_CMD_MASK); |
| 1096 | cmdsp->cmd = cmd; |
| 1097 | *cmdsp->cmd_dma = cpu_to_le64(cmd); |
| 1098 | cmdsp->flags = BRCM_SBA_CMD_TYPE_B; |
| 1099 | cmdsp->data = src + msg_offset; |
| 1100 | cmdsp->data_len = msg_len; |
| 1101 | cmdsp++; |
| 1102 | } |
| 1103 | |
| 1104 | /* Type-A command to write buf0 */ |
| 1105 | cmd = sba_cmd_enc(0x0, SBA_TYPE_A, |
| 1106 | SBA_TYPE_SHIFT, SBA_TYPE_MASK); |
| 1107 | cmd = sba_cmd_enc(cmd, msg_len, |
| 1108 | SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); |
| 1109 | cmd = sba_cmd_enc(cmd, 0x1, |
| 1110 | SBA_RESP_SHIFT, SBA_RESP_MASK); |
| 1111 | c_mdata = sba_cmd_write_c_mdata(0); |
| 1112 | cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), |
| 1113 | SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); |
| 1114 | cmd = sba_cmd_enc(cmd, SBA_CMD_WRITE_BUFFER, |
| 1115 | SBA_CMD_SHIFT, SBA_CMD_MASK); |
| 1116 | cmdsp->cmd = cmd; |
| 1117 | *cmdsp->cmd_dma = cpu_to_le64(cmd); |
| 1118 | cmdsp->flags = BRCM_SBA_CMD_TYPE_A; |
| 1119 | if (req->sba->hw_resp_size) { |
| 1120 | cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP; |
Anup Patel | e7ae72a | 2017-08-22 15:26:54 +0530 | [diff] [blame^] | 1121 | cmdsp->resp = resp_dma; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 1122 | cmdsp->resp_len = req->sba->hw_resp_size; |
| 1123 | } |
| 1124 | cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT; |
| 1125 | cmdsp->data = *dst_p + msg_offset; |
| 1126 | cmdsp->data_len = msg_len; |
| 1127 | cmdsp++; |
| 1128 | |
| 1129 | skip_p: |
| 1130 | if (!dst_q) |
| 1131 | goto skip_q; |
| 1132 | |
| 1133 | /* Type-A command to zero all buffers */ |
| 1134 | cmd = sba_cmd_enc(0x0, SBA_TYPE_A, |
| 1135 | SBA_TYPE_SHIFT, SBA_TYPE_MASK); |
| 1136 | cmd = sba_cmd_enc(cmd, msg_len, |
| 1137 | SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); |
| 1138 | cmd = sba_cmd_enc(cmd, SBA_CMD_ZERO_ALL_BUFFERS, |
| 1139 | SBA_CMD_SHIFT, SBA_CMD_MASK); |
| 1140 | cmdsp->cmd = cmd; |
| 1141 | *cmdsp->cmd_dma = cpu_to_le64(cmd); |
| 1142 | cmdsp->flags = BRCM_SBA_CMD_TYPE_A; |
| 1143 | cmdsp++; |
| 1144 | |
| 1145 | if (dpos == 255) |
| 1146 | goto skip_q_computation; |
| 1147 | pos = (dpos < req->sba->max_pq_coefs) ? |
| 1148 | dpos : (req->sba->max_pq_coefs - 1); |
| 1149 | |
| 1150 | /* |
| 1151 | * Type-B command to generate initial Q from data |
| 1152 | * and store output into buf0 |
| 1153 | */ |
| 1154 | cmd = sba_cmd_enc(0x0, SBA_TYPE_B, |
| 1155 | SBA_TYPE_SHIFT, SBA_TYPE_MASK); |
| 1156 | cmd = sba_cmd_enc(cmd, msg_len, |
| 1157 | SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); |
| 1158 | c_mdata = sba_cmd_pq_c_mdata(pos, 0, 0); |
| 1159 | cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), |
| 1160 | SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); |
| 1161 | cmd = sba_cmd_enc(cmd, SBA_C_MDATA_MS(c_mdata), |
| 1162 | SBA_C_MDATA_MS_SHIFT, SBA_C_MDATA_MS_MASK); |
| 1163 | cmd = sba_cmd_enc(cmd, SBA_CMD_GALOIS, |
| 1164 | SBA_CMD_SHIFT, SBA_CMD_MASK); |
| 1165 | cmdsp->cmd = cmd; |
| 1166 | *cmdsp->cmd_dma = cpu_to_le64(cmd); |
| 1167 | cmdsp->flags = BRCM_SBA_CMD_TYPE_B; |
| 1168 | cmdsp->data = src + msg_offset; |
| 1169 | cmdsp->data_len = msg_len; |
| 1170 | cmdsp++; |
| 1171 | |
| 1172 | dpos -= pos; |
| 1173 | |
| 1174 | /* Multiple Type-A command to generate final Q */ |
| 1175 | while (dpos) { |
| 1176 | pos = (dpos < req->sba->max_pq_coefs) ? |
| 1177 | dpos : (req->sba->max_pq_coefs - 1); |
| 1178 | |
| 1179 | /* |
| 1180 | * Type-A command to generate Q with buf0 and |
| 1181 | * buf1 store result in buf0 |
| 1182 | */ |
| 1183 | cmd = sba_cmd_enc(0x0, SBA_TYPE_A, |
| 1184 | SBA_TYPE_SHIFT, SBA_TYPE_MASK); |
| 1185 | cmd = sba_cmd_enc(cmd, msg_len, |
| 1186 | SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); |
| 1187 | c_mdata = sba_cmd_pq_c_mdata(pos, 0, 1); |
| 1188 | cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), |
| 1189 | SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); |
| 1190 | cmd = sba_cmd_enc(cmd, SBA_C_MDATA_MS(c_mdata), |
| 1191 | SBA_C_MDATA_MS_SHIFT, SBA_C_MDATA_MS_MASK); |
| 1192 | cmd = sba_cmd_enc(cmd, SBA_CMD_GALOIS, |
| 1193 | SBA_CMD_SHIFT, SBA_CMD_MASK); |
| 1194 | cmdsp->cmd = cmd; |
| 1195 | *cmdsp->cmd_dma = cpu_to_le64(cmd); |
| 1196 | cmdsp->flags = BRCM_SBA_CMD_TYPE_A; |
| 1197 | cmdsp++; |
| 1198 | |
| 1199 | dpos -= pos; |
| 1200 | } |
| 1201 | |
| 1202 | skip_q_computation: |
| 1203 | if (pq_continue) { |
| 1204 | /* |
| 1205 | * Type-B command to XOR previous output with |
| 1206 | * buf0 and write it into buf0 |
| 1207 | */ |
| 1208 | cmd = sba_cmd_enc(0x0, SBA_TYPE_B, |
| 1209 | SBA_TYPE_SHIFT, SBA_TYPE_MASK); |
| 1210 | cmd = sba_cmd_enc(cmd, msg_len, |
| 1211 | SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); |
| 1212 | c_mdata = sba_cmd_xor_c_mdata(0, 0); |
| 1213 | cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), |
| 1214 | SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); |
| 1215 | cmd = sba_cmd_enc(cmd, SBA_CMD_XOR, |
| 1216 | SBA_CMD_SHIFT, SBA_CMD_MASK); |
| 1217 | cmdsp->cmd = cmd; |
| 1218 | *cmdsp->cmd_dma = cpu_to_le64(cmd); |
| 1219 | cmdsp->flags = BRCM_SBA_CMD_TYPE_B; |
| 1220 | cmdsp->data = *dst_q + msg_offset; |
| 1221 | cmdsp->data_len = msg_len; |
| 1222 | cmdsp++; |
| 1223 | } |
| 1224 | |
| 1225 | /* Type-A command to write buf0 */ |
| 1226 | cmd = sba_cmd_enc(0x0, SBA_TYPE_A, |
| 1227 | SBA_TYPE_SHIFT, SBA_TYPE_MASK); |
| 1228 | cmd = sba_cmd_enc(cmd, msg_len, |
| 1229 | SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK); |
| 1230 | cmd = sba_cmd_enc(cmd, 0x1, |
| 1231 | SBA_RESP_SHIFT, SBA_RESP_MASK); |
| 1232 | c_mdata = sba_cmd_write_c_mdata(0); |
| 1233 | cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata), |
| 1234 | SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK); |
| 1235 | cmd = sba_cmd_enc(cmd, SBA_CMD_WRITE_BUFFER, |
| 1236 | SBA_CMD_SHIFT, SBA_CMD_MASK); |
| 1237 | cmdsp->cmd = cmd; |
| 1238 | *cmdsp->cmd_dma = cpu_to_le64(cmd); |
| 1239 | cmdsp->flags = BRCM_SBA_CMD_TYPE_A; |
| 1240 | if (req->sba->hw_resp_size) { |
| 1241 | cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP; |
Anup Patel | e7ae72a | 2017-08-22 15:26:54 +0530 | [diff] [blame^] | 1242 | cmdsp->resp = resp_dma; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 1243 | cmdsp->resp_len = req->sba->hw_resp_size; |
| 1244 | } |
| 1245 | cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT; |
| 1246 | cmdsp->data = *dst_q + msg_offset; |
| 1247 | cmdsp->data_len = msg_len; |
| 1248 | cmdsp++; |
| 1249 | |
| 1250 | skip_q: |
| 1251 | /* Fillup brcm_message */ |
| 1252 | msg->type = BRCM_MESSAGE_SBA; |
| 1253 | msg->sba.cmds = cmds; |
| 1254 | msg->sba.cmds_count = cmdsp - cmds; |
| 1255 | msg->ctx = req; |
| 1256 | msg->error = 0; |
| 1257 | } |
| 1258 | |
Vinod Koul | dd2bceb | 2017-07-19 10:03:24 +0530 | [diff] [blame] | 1259 | static struct sba_request * |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 1260 | sba_prep_dma_pq_single_req(struct sba_device *sba, dma_addr_t off, |
| 1261 | dma_addr_t *dst_p, dma_addr_t *dst_q, |
| 1262 | dma_addr_t src, u8 scf, size_t len, |
| 1263 | unsigned long flags) |
| 1264 | { |
| 1265 | struct sba_request *req = NULL; |
| 1266 | |
| 1267 | /* Alloc new request */ |
| 1268 | req = sba_alloc_request(sba); |
| 1269 | if (!req) |
| 1270 | return NULL; |
Anup Patel | 57a2850 | 2017-08-22 15:26:52 +0530 | [diff] [blame] | 1271 | if (flags & DMA_PREP_FENCE) |
| 1272 | req->flags |= SBA_REQUEST_FENCE; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 1273 | |
| 1274 | /* Fillup request messages */ |
| 1275 | sba_fillup_pq_single_msg(req, dmaf_continue(flags), |
| 1276 | req->cmds, &req->msg, off, len, |
| 1277 | dst_p, dst_q, src, scf); |
| 1278 | |
| 1279 | /* Init async_tx descriptor */ |
| 1280 | req->tx.flags = flags; |
| 1281 | req->tx.cookie = -EBUSY; |
| 1282 | |
| 1283 | return req; |
| 1284 | } |
| 1285 | |
| 1286 | static struct dma_async_tx_descriptor * |
| 1287 | sba_prep_dma_pq(struct dma_chan *dchan, dma_addr_t *dst, dma_addr_t *src, |
| 1288 | u32 src_cnt, const u8 *scf, size_t len, unsigned long flags) |
| 1289 | { |
| 1290 | u32 i, dst_q_index; |
| 1291 | size_t req_len; |
| 1292 | bool slow = false; |
| 1293 | dma_addr_t off = 0; |
| 1294 | dma_addr_t *dst_p = NULL, *dst_q = NULL; |
| 1295 | struct sba_device *sba = to_sba_device(dchan); |
| 1296 | struct sba_request *first = NULL, *req; |
| 1297 | |
| 1298 | /* Sanity checks */ |
| 1299 | if (unlikely(src_cnt > sba->max_pq_srcs)) |
| 1300 | return NULL; |
| 1301 | for (i = 0; i < src_cnt; i++) |
| 1302 | if (sba->max_pq_coefs <= raid6_gflog[scf[i]]) |
| 1303 | slow = true; |
| 1304 | |
| 1305 | /* Figure-out P and Q destination addresses */ |
| 1306 | if (!(flags & DMA_PREP_PQ_DISABLE_P)) |
| 1307 | dst_p = &dst[0]; |
| 1308 | if (!(flags & DMA_PREP_PQ_DISABLE_Q)) |
| 1309 | dst_q = &dst[1]; |
| 1310 | |
| 1311 | /* Create chained requests where each request is upto hw_buf_size */ |
| 1312 | while (len) { |
| 1313 | req_len = (len < sba->hw_buf_size) ? len : sba->hw_buf_size; |
| 1314 | |
| 1315 | if (slow) { |
| 1316 | dst_q_index = src_cnt; |
| 1317 | |
| 1318 | if (dst_q) { |
| 1319 | for (i = 0; i < src_cnt; i++) { |
| 1320 | if (*dst_q == src[i]) { |
| 1321 | dst_q_index = i; |
| 1322 | break; |
| 1323 | } |
| 1324 | } |
| 1325 | } |
| 1326 | |
| 1327 | if (dst_q_index < src_cnt) { |
| 1328 | i = dst_q_index; |
| 1329 | req = sba_prep_dma_pq_single_req(sba, |
| 1330 | off, dst_p, dst_q, src[i], scf[i], |
| 1331 | req_len, flags | DMA_PREP_FENCE); |
| 1332 | if (!req) |
| 1333 | goto fail; |
| 1334 | |
| 1335 | if (first) |
| 1336 | sba_chain_request(first, req); |
| 1337 | else |
| 1338 | first = req; |
| 1339 | |
| 1340 | flags |= DMA_PREP_CONTINUE; |
| 1341 | } |
| 1342 | |
| 1343 | for (i = 0; i < src_cnt; i++) { |
| 1344 | if (dst_q_index == i) |
| 1345 | continue; |
| 1346 | |
| 1347 | req = sba_prep_dma_pq_single_req(sba, |
| 1348 | off, dst_p, dst_q, src[i], scf[i], |
| 1349 | req_len, flags | DMA_PREP_FENCE); |
| 1350 | if (!req) |
| 1351 | goto fail; |
| 1352 | |
| 1353 | if (first) |
| 1354 | sba_chain_request(first, req); |
| 1355 | else |
| 1356 | first = req; |
| 1357 | |
| 1358 | flags |= DMA_PREP_CONTINUE; |
| 1359 | } |
| 1360 | } else { |
| 1361 | req = sba_prep_dma_pq_req(sba, off, |
| 1362 | dst_p, dst_q, src, src_cnt, |
| 1363 | scf, req_len, flags); |
| 1364 | if (!req) |
| 1365 | goto fail; |
| 1366 | |
| 1367 | if (first) |
| 1368 | sba_chain_request(first, req); |
| 1369 | else |
| 1370 | first = req; |
| 1371 | } |
| 1372 | |
| 1373 | off += req_len; |
| 1374 | len -= req_len; |
| 1375 | } |
| 1376 | |
| 1377 | return (first) ? &first->tx : NULL; |
| 1378 | |
| 1379 | fail: |
| 1380 | if (first) |
| 1381 | sba_free_chained_requests(first); |
| 1382 | return NULL; |
| 1383 | } |
| 1384 | |
| 1385 | /* ====== Mailbox callbacks ===== */ |
| 1386 | |
| 1387 | static void sba_dma_tx_actions(struct sba_request *req) |
| 1388 | { |
| 1389 | struct dma_async_tx_descriptor *tx = &req->tx; |
| 1390 | |
| 1391 | WARN_ON(tx->cookie < 0); |
| 1392 | |
| 1393 | if (tx->cookie > 0) { |
| 1394 | dma_cookie_complete(tx); |
| 1395 | |
| 1396 | /* |
| 1397 | * Call the callback (must not sleep or submit new |
| 1398 | * operations to this channel) |
| 1399 | */ |
| 1400 | if (tx->callback) |
| 1401 | tx->callback(tx->callback_param); |
| 1402 | |
| 1403 | dma_descriptor_unmap(tx); |
| 1404 | } |
| 1405 | |
| 1406 | /* Run dependent operations */ |
| 1407 | dma_run_dependencies(tx); |
| 1408 | |
| 1409 | /* If waiting for 'ack' then move to completed list */ |
| 1410 | if (!async_tx_test_ack(&req->tx)) |
| 1411 | sba_complete_chained_requests(req); |
| 1412 | else |
| 1413 | sba_free_chained_requests(req); |
| 1414 | } |
| 1415 | |
| 1416 | static void sba_receive_message(struct mbox_client *cl, void *msg) |
| 1417 | { |
| 1418 | unsigned long flags; |
| 1419 | struct brcm_message *m = msg; |
| 1420 | struct sba_request *req = m->ctx, *req1; |
| 1421 | struct sba_device *sba = req->sba; |
| 1422 | |
| 1423 | /* Error count if message has error */ |
| 1424 | if (m->error < 0) |
| 1425 | dev_err(sba->dev, "%s got message with error %d", |
| 1426 | dma_chan_name(&sba->dma_chan), m->error); |
| 1427 | |
| 1428 | /* Mark request as received */ |
| 1429 | sba_received_request(req); |
| 1430 | |
| 1431 | /* Wait for all chained requests to be completed */ |
| 1432 | if (atomic_dec_return(&req->first->next_pending_count)) |
| 1433 | goto done; |
| 1434 | |
| 1435 | /* Point to first request */ |
| 1436 | req = req->first; |
| 1437 | |
| 1438 | /* Update request */ |
Anup Patel | 57a2850 | 2017-08-22 15:26:52 +0530 | [diff] [blame] | 1439 | if (req->flags & SBA_REQUEST_STATE_RECEIVED) |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 1440 | sba_dma_tx_actions(req); |
| 1441 | else |
| 1442 | sba_free_chained_requests(req); |
| 1443 | |
| 1444 | spin_lock_irqsave(&sba->reqs_lock, flags); |
| 1445 | |
| 1446 | /* Re-check all completed request waiting for 'ack' */ |
| 1447 | list_for_each_entry_safe(req, req1, &sba->reqs_completed_list, node) { |
| 1448 | spin_unlock_irqrestore(&sba->reqs_lock, flags); |
| 1449 | sba_dma_tx_actions(req); |
| 1450 | spin_lock_irqsave(&sba->reqs_lock, flags); |
| 1451 | } |
| 1452 | |
| 1453 | spin_unlock_irqrestore(&sba->reqs_lock, flags); |
| 1454 | |
| 1455 | done: |
| 1456 | /* Try to submit pending request */ |
| 1457 | sba_issue_pending(&sba->dma_chan); |
| 1458 | } |
| 1459 | |
| 1460 | /* ====== Platform driver routines ===== */ |
| 1461 | |
| 1462 | static int sba_prealloc_channel_resources(struct sba_device *sba) |
| 1463 | { |
Anup Patel | e7ae72a | 2017-08-22 15:26:54 +0530 | [diff] [blame^] | 1464 | int i, j, ret = 0; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 1465 | struct sba_request *req = NULL; |
| 1466 | |
| 1467 | sba->resp_base = dma_alloc_coherent(sba->dma_dev.dev, |
| 1468 | sba->max_resp_pool_size, |
| 1469 | &sba->resp_dma_base, GFP_KERNEL); |
| 1470 | if (!sba->resp_base) |
| 1471 | return -ENOMEM; |
| 1472 | |
| 1473 | sba->cmds_base = dma_alloc_coherent(sba->dma_dev.dev, |
| 1474 | sba->max_cmds_pool_size, |
| 1475 | &sba->cmds_dma_base, GFP_KERNEL); |
| 1476 | if (!sba->cmds_base) { |
| 1477 | ret = -ENOMEM; |
| 1478 | goto fail_free_resp_pool; |
| 1479 | } |
| 1480 | |
| 1481 | spin_lock_init(&sba->reqs_lock); |
| 1482 | sba->reqs_fence = false; |
| 1483 | INIT_LIST_HEAD(&sba->reqs_alloc_list); |
| 1484 | INIT_LIST_HEAD(&sba->reqs_pending_list); |
| 1485 | INIT_LIST_HEAD(&sba->reqs_active_list); |
| 1486 | INIT_LIST_HEAD(&sba->reqs_received_list); |
| 1487 | INIT_LIST_HEAD(&sba->reqs_completed_list); |
| 1488 | INIT_LIST_HEAD(&sba->reqs_aborted_list); |
| 1489 | INIT_LIST_HEAD(&sba->reqs_free_list); |
| 1490 | |
| 1491 | sba->reqs = devm_kcalloc(sba->dev, sba->max_req, |
| 1492 | sizeof(*req), GFP_KERNEL); |
| 1493 | if (!sba->reqs) { |
| 1494 | ret = -ENOMEM; |
| 1495 | goto fail_free_cmds_pool; |
| 1496 | } |
| 1497 | |
Anup Patel | e7ae72a | 2017-08-22 15:26:54 +0530 | [diff] [blame^] | 1498 | for (i = 0; i < sba->max_req; i++) { |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 1499 | req = &sba->reqs[i]; |
| 1500 | INIT_LIST_HEAD(&req->node); |
| 1501 | req->sba = sba; |
Anup Patel | 57a2850 | 2017-08-22 15:26:52 +0530 | [diff] [blame] | 1502 | req->flags = SBA_REQUEST_STATE_FREE; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 1503 | INIT_LIST_HEAD(&req->next); |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 1504 | atomic_set(&req->next_pending_count, 0); |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 1505 | req->cmds = devm_kcalloc(sba->dev, sba->max_cmd_per_req, |
| 1506 | sizeof(*req->cmds), GFP_KERNEL); |
| 1507 | if (!req->cmds) { |
| 1508 | ret = -ENOMEM; |
| 1509 | goto fail_free_cmds_pool; |
| 1510 | } |
| 1511 | for (j = 0; j < sba->max_cmd_per_req; j++) { |
| 1512 | req->cmds[j].cmd = 0; |
| 1513 | req->cmds[j].cmd_dma = sba->cmds_base + |
| 1514 | (i * sba->max_cmd_per_req + j) * sizeof(u64); |
| 1515 | req->cmds[j].cmd_dma_addr = sba->cmds_dma_base + |
| 1516 | (i * sba->max_cmd_per_req + j) * sizeof(u64); |
| 1517 | req->cmds[j].flags = 0; |
| 1518 | } |
| 1519 | memset(&req->msg, 0, sizeof(req->msg)); |
| 1520 | dma_async_tx_descriptor_init(&req->tx, &sba->dma_chan); |
| 1521 | req->tx.tx_submit = sba_tx_submit; |
Anup Patel | e7ae72a | 2017-08-22 15:26:54 +0530 | [diff] [blame^] | 1522 | req->tx.phys = sba->resp_dma_base + i * sba->hw_resp_size; |
Anup Patel | 743e1c8 | 2017-05-15 10:34:54 +0530 | [diff] [blame] | 1523 | list_add_tail(&req->node, &sba->reqs_free_list); |
| 1524 | } |
| 1525 | |
| 1526 | sba->reqs_free_count = sba->max_req; |
| 1527 | |
| 1528 | return 0; |
| 1529 | |
| 1530 | fail_free_cmds_pool: |
| 1531 | dma_free_coherent(sba->dma_dev.dev, |
| 1532 | sba->max_cmds_pool_size, |
| 1533 | sba->cmds_base, sba->cmds_dma_base); |
| 1534 | fail_free_resp_pool: |
| 1535 | dma_free_coherent(sba->dma_dev.dev, |
| 1536 | sba->max_resp_pool_size, |
| 1537 | sba->resp_base, sba->resp_dma_base); |
| 1538 | return ret; |
| 1539 | } |
| 1540 | |
| 1541 | static void sba_freeup_channel_resources(struct sba_device *sba) |
| 1542 | { |
| 1543 | dmaengine_terminate_all(&sba->dma_chan); |
| 1544 | dma_free_coherent(sba->dma_dev.dev, sba->max_cmds_pool_size, |
| 1545 | sba->cmds_base, sba->cmds_dma_base); |
| 1546 | dma_free_coherent(sba->dma_dev.dev, sba->max_resp_pool_size, |
| 1547 | sba->resp_base, sba->resp_dma_base); |
| 1548 | sba->resp_base = NULL; |
| 1549 | sba->resp_dma_base = 0; |
| 1550 | } |
| 1551 | |
| 1552 | static int sba_async_register(struct sba_device *sba) |
| 1553 | { |
| 1554 | int ret; |
| 1555 | struct dma_device *dma_dev = &sba->dma_dev; |
| 1556 | |
| 1557 | /* Initialize DMA channel cookie */ |
| 1558 | sba->dma_chan.device = dma_dev; |
| 1559 | dma_cookie_init(&sba->dma_chan); |
| 1560 | |
| 1561 | /* Initialize DMA device capability mask */ |
| 1562 | dma_cap_zero(dma_dev->cap_mask); |
| 1563 | dma_cap_set(DMA_INTERRUPT, dma_dev->cap_mask); |
| 1564 | dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask); |
| 1565 | dma_cap_set(DMA_XOR, dma_dev->cap_mask); |
| 1566 | dma_cap_set(DMA_PQ, dma_dev->cap_mask); |
| 1567 | |
| 1568 | /* |
| 1569 | * Set mailbox channel device as the base device of |
| 1570 | * our dma_device because the actual memory accesses |
| 1571 | * will be done by mailbox controller |
| 1572 | */ |
| 1573 | dma_dev->dev = sba->mbox_dev; |
| 1574 | |
| 1575 | /* Set base prep routines */ |
| 1576 | dma_dev->device_free_chan_resources = sba_free_chan_resources; |
| 1577 | dma_dev->device_terminate_all = sba_device_terminate_all; |
| 1578 | dma_dev->device_issue_pending = sba_issue_pending; |
| 1579 | dma_dev->device_tx_status = sba_tx_status; |
| 1580 | |
| 1581 | /* Set interrupt routine */ |
| 1582 | if (dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask)) |
| 1583 | dma_dev->device_prep_dma_interrupt = sba_prep_dma_interrupt; |
| 1584 | |
| 1585 | /* Set memcpy routine */ |
| 1586 | if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) |
| 1587 | dma_dev->device_prep_dma_memcpy = sba_prep_dma_memcpy; |
| 1588 | |
| 1589 | /* Set xor routine and capability */ |
| 1590 | if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) { |
| 1591 | dma_dev->device_prep_dma_xor = sba_prep_dma_xor; |
| 1592 | dma_dev->max_xor = sba->max_xor_srcs; |
| 1593 | } |
| 1594 | |
| 1595 | /* Set pq routine and capability */ |
| 1596 | if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) { |
| 1597 | dma_dev->device_prep_dma_pq = sba_prep_dma_pq; |
| 1598 | dma_set_maxpq(dma_dev, sba->max_pq_srcs, 0); |
| 1599 | } |
| 1600 | |
| 1601 | /* Initialize DMA device channel list */ |
| 1602 | INIT_LIST_HEAD(&dma_dev->channels); |
| 1603 | list_add_tail(&sba->dma_chan.device_node, &dma_dev->channels); |
| 1604 | |
| 1605 | /* Register with Linux async DMA framework*/ |
| 1606 | ret = dma_async_device_register(dma_dev); |
| 1607 | if (ret) { |
| 1608 | dev_err(sba->dev, "async device register error %d", ret); |
| 1609 | return ret; |
| 1610 | } |
| 1611 | |
| 1612 | dev_info(sba->dev, "%s capabilities: %s%s%s%s\n", |
| 1613 | dma_chan_name(&sba->dma_chan), |
| 1614 | dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask) ? "interrupt " : "", |
| 1615 | dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask) ? "memcpy " : "", |
| 1616 | dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "xor " : "", |
| 1617 | dma_has_cap(DMA_PQ, dma_dev->cap_mask) ? "pq " : ""); |
| 1618 | |
| 1619 | return 0; |
| 1620 | } |
| 1621 | |
| 1622 | static int sba_probe(struct platform_device *pdev) |
| 1623 | { |
| 1624 | int i, ret = 0, mchans_count; |
| 1625 | struct sba_device *sba; |
| 1626 | struct platform_device *mbox_pdev; |
| 1627 | struct of_phandle_args args; |
| 1628 | |
| 1629 | /* Allocate main SBA struct */ |
| 1630 | sba = devm_kzalloc(&pdev->dev, sizeof(*sba), GFP_KERNEL); |
| 1631 | if (!sba) |
| 1632 | return -ENOMEM; |
| 1633 | |
| 1634 | sba->dev = &pdev->dev; |
| 1635 | platform_set_drvdata(pdev, sba); |
| 1636 | |
| 1637 | /* Determine SBA version from DT compatible string */ |
| 1638 | if (of_device_is_compatible(sba->dev->of_node, "brcm,iproc-sba")) |
| 1639 | sba->ver = SBA_VER_1; |
| 1640 | else if (of_device_is_compatible(sba->dev->of_node, |
| 1641 | "brcm,iproc-sba-v2")) |
| 1642 | sba->ver = SBA_VER_2; |
| 1643 | else |
| 1644 | return -ENODEV; |
| 1645 | |
| 1646 | /* Derived Configuration parameters */ |
| 1647 | switch (sba->ver) { |
| 1648 | case SBA_VER_1: |
| 1649 | sba->max_req = 1024; |
| 1650 | sba->hw_buf_size = 4096; |
| 1651 | sba->hw_resp_size = 8; |
| 1652 | sba->max_pq_coefs = 6; |
| 1653 | sba->max_pq_srcs = 6; |
| 1654 | break; |
| 1655 | case SBA_VER_2: |
| 1656 | sba->max_req = 1024; |
| 1657 | sba->hw_buf_size = 4096; |
| 1658 | sba->hw_resp_size = 8; |
| 1659 | sba->max_pq_coefs = 30; |
| 1660 | /* |
| 1661 | * We can support max_pq_srcs == max_pq_coefs because |
| 1662 | * we are limited by number of SBA commands that we can |
| 1663 | * fit in one message for underlying ring manager HW. |
| 1664 | */ |
| 1665 | sba->max_pq_srcs = 12; |
| 1666 | break; |
| 1667 | default: |
| 1668 | return -EINVAL; |
| 1669 | } |
| 1670 | sba->max_cmd_per_req = sba->max_pq_srcs + 3; |
| 1671 | sba->max_xor_srcs = sba->max_cmd_per_req - 1; |
| 1672 | sba->max_resp_pool_size = sba->max_req * sba->hw_resp_size; |
| 1673 | sba->max_cmds_pool_size = sba->max_req * |
| 1674 | sba->max_cmd_per_req * sizeof(u64); |
| 1675 | |
| 1676 | /* Setup mailbox client */ |
| 1677 | sba->client.dev = &pdev->dev; |
| 1678 | sba->client.rx_callback = sba_receive_message; |
| 1679 | sba->client.tx_block = false; |
| 1680 | sba->client.knows_txdone = false; |
| 1681 | sba->client.tx_tout = 0; |
| 1682 | |
| 1683 | /* Number of channels equals number of mailbox channels */ |
| 1684 | ret = of_count_phandle_with_args(pdev->dev.of_node, |
| 1685 | "mboxes", "#mbox-cells"); |
| 1686 | if (ret <= 0) |
| 1687 | return -ENODEV; |
| 1688 | mchans_count = ret; |
| 1689 | sba->mchans_count = 0; |
| 1690 | atomic_set(&sba->mchans_current, 0); |
| 1691 | |
| 1692 | /* Allocate mailbox channel array */ |
| 1693 | sba->mchans = devm_kcalloc(&pdev->dev, sba->mchans_count, |
| 1694 | sizeof(*sba->mchans), GFP_KERNEL); |
| 1695 | if (!sba->mchans) |
| 1696 | return -ENOMEM; |
| 1697 | |
| 1698 | /* Request mailbox channels */ |
| 1699 | for (i = 0; i < mchans_count; i++) { |
| 1700 | sba->mchans[i] = mbox_request_channel(&sba->client, i); |
| 1701 | if (IS_ERR(sba->mchans[i])) { |
| 1702 | ret = PTR_ERR(sba->mchans[i]); |
| 1703 | goto fail_free_mchans; |
| 1704 | } |
| 1705 | sba->mchans_count++; |
| 1706 | } |
| 1707 | |
| 1708 | /* Find-out underlying mailbox device */ |
| 1709 | ret = of_parse_phandle_with_args(pdev->dev.of_node, |
| 1710 | "mboxes", "#mbox-cells", 0, &args); |
| 1711 | if (ret) |
| 1712 | goto fail_free_mchans; |
| 1713 | mbox_pdev = of_find_device_by_node(args.np); |
| 1714 | of_node_put(args.np); |
| 1715 | if (!mbox_pdev) { |
| 1716 | ret = -ENODEV; |
| 1717 | goto fail_free_mchans; |
| 1718 | } |
| 1719 | sba->mbox_dev = &mbox_pdev->dev; |
| 1720 | |
| 1721 | /* All mailbox channels should be of same ring manager device */ |
| 1722 | for (i = 1; i < mchans_count; i++) { |
| 1723 | ret = of_parse_phandle_with_args(pdev->dev.of_node, |
| 1724 | "mboxes", "#mbox-cells", i, &args); |
| 1725 | if (ret) |
| 1726 | goto fail_free_mchans; |
| 1727 | mbox_pdev = of_find_device_by_node(args.np); |
| 1728 | of_node_put(args.np); |
| 1729 | if (sba->mbox_dev != &mbox_pdev->dev) { |
| 1730 | ret = -EINVAL; |
| 1731 | goto fail_free_mchans; |
| 1732 | } |
| 1733 | } |
| 1734 | |
| 1735 | /* Register DMA device with linux async framework */ |
| 1736 | ret = sba_async_register(sba); |
| 1737 | if (ret) |
| 1738 | goto fail_free_mchans; |
| 1739 | |
| 1740 | /* Prealloc channel resource */ |
| 1741 | ret = sba_prealloc_channel_resources(sba); |
| 1742 | if (ret) |
| 1743 | goto fail_async_dev_unreg; |
| 1744 | |
| 1745 | /* Print device info */ |
| 1746 | dev_info(sba->dev, "%s using SBAv%d and %d mailbox channels", |
| 1747 | dma_chan_name(&sba->dma_chan), sba->ver+1, |
| 1748 | sba->mchans_count); |
| 1749 | |
| 1750 | return 0; |
| 1751 | |
| 1752 | fail_async_dev_unreg: |
| 1753 | dma_async_device_unregister(&sba->dma_dev); |
| 1754 | fail_free_mchans: |
| 1755 | for (i = 0; i < sba->mchans_count; i++) |
| 1756 | mbox_free_channel(sba->mchans[i]); |
| 1757 | return ret; |
| 1758 | } |
| 1759 | |
| 1760 | static int sba_remove(struct platform_device *pdev) |
| 1761 | { |
| 1762 | int i; |
| 1763 | struct sba_device *sba = platform_get_drvdata(pdev); |
| 1764 | |
| 1765 | sba_freeup_channel_resources(sba); |
| 1766 | |
| 1767 | dma_async_device_unregister(&sba->dma_dev); |
| 1768 | |
| 1769 | for (i = 0; i < sba->mchans_count; i++) |
| 1770 | mbox_free_channel(sba->mchans[i]); |
| 1771 | |
| 1772 | return 0; |
| 1773 | } |
| 1774 | |
| 1775 | static const struct of_device_id sba_of_match[] = { |
| 1776 | { .compatible = "brcm,iproc-sba", }, |
| 1777 | { .compatible = "brcm,iproc-sba-v2", }, |
| 1778 | {}, |
| 1779 | }; |
| 1780 | MODULE_DEVICE_TABLE(of, sba_of_match); |
| 1781 | |
| 1782 | static struct platform_driver sba_driver = { |
| 1783 | .probe = sba_probe, |
| 1784 | .remove = sba_remove, |
| 1785 | .driver = { |
| 1786 | .name = "bcm-sba-raid", |
| 1787 | .of_match_table = sba_of_match, |
| 1788 | }, |
| 1789 | }; |
| 1790 | module_platform_driver(sba_driver); |
| 1791 | |
| 1792 | MODULE_DESCRIPTION("Broadcom SBA RAID driver"); |
| 1793 | MODULE_AUTHOR("Anup Patel <anup.patel@broadcom.com>"); |
| 1794 | MODULE_LICENSE("GPL v2"); |