Suman Anna | 49b0597 | 2018-05-31 12:11:01 -0500 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (c) 2015, Sony Mobile Communications AB. |
| 4 | * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved. |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 5 | */ |
| 6 | |
| 7 | #include <linux/interrupt.h> |
| 8 | #include <linux/io.h> |
Bjorn Andersson | ab460a2 | 2018-04-19 18:17:57 -0700 | [diff] [blame] | 9 | #include <linux/mailbox_client.h> |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 10 | #include <linux/mfd/syscon.h> |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/of_irq.h> |
| 13 | #include <linux/of_platform.h> |
| 14 | #include <linux/platform_device.h> |
| 15 | #include <linux/regmap.h> |
| 16 | #include <linux/sched.h> |
Niklas Cassel | 67cd0ee | 2018-06-29 19:01:01 +0200 | [diff] [blame] | 17 | #include <linux/sizes.h> |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 18 | #include <linux/slab.h> |
| 19 | #include <linux/soc/qcom/smem.h> |
| 20 | #include <linux/wait.h> |
| 21 | #include <linux/rpmsg.h> |
Bjorn Andersson | 8fc9472 | 2016-10-19 19:40:03 -0700 | [diff] [blame] | 22 | #include <linux/rpmsg/qcom_smd.h> |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 23 | |
| 24 | #include "rpmsg_internal.h" |
| 25 | |
| 26 | /* |
| 27 | * The Qualcomm Shared Memory communication solution provides point-to-point |
| 28 | * channels for clients to send and receive streaming or packet based data. |
| 29 | * |
| 30 | * Each channel consists of a control item (channel info) and a ring buffer |
| 31 | * pair. The channel info carry information related to channel state, flow |
| 32 | * control and the offsets within the ring buffer. |
| 33 | * |
| 34 | * All allocated channels are listed in an allocation table, identifying the |
| 35 | * pair of items by name, type and remote processor. |
| 36 | * |
| 37 | * Upon creating a new channel the remote processor allocates channel info and |
| 38 | * ring buffer items from the smem heap and populate the allocation table. An |
| 39 | * interrupt is sent to the other end of the channel and a scan for new |
| 40 | * channels should be done. A channel never goes away, it will only change |
| 41 | * state. |
| 42 | * |
| 43 | * The remote processor signals it intent for bring up the communication |
| 44 | * channel by setting the state of its end of the channel to "opening" and |
| 45 | * sends out an interrupt. We detect this change and register a smd device to |
| 46 | * consume the channel. Upon finding a consumer we finish the handshake and the |
| 47 | * channel is up. |
| 48 | * |
| 49 | * Upon closing a channel, the remote processor will update the state of its |
| 50 | * end of the channel and signal us, we will then unregister any attached |
| 51 | * device and close our end of the channel. |
| 52 | * |
| 53 | * Devices attached to a channel can use the qcom_smd_send function to push |
| 54 | * data to the channel, this is done by copying the data into the tx ring |
| 55 | * buffer, updating the pointers in the channel info and signaling the remote |
| 56 | * processor. |
| 57 | * |
| 58 | * The remote processor does the equivalent when it transfer data and upon |
| 59 | * receiving the interrupt we check the channel info for new data and delivers |
| 60 | * this to the attached device. If the device is not ready to receive the data |
| 61 | * we leave it in the ring buffer for now. |
| 62 | */ |
| 63 | |
| 64 | struct smd_channel_info; |
| 65 | struct smd_channel_info_pair; |
| 66 | struct smd_channel_info_word; |
| 67 | struct smd_channel_info_word_pair; |
| 68 | |
| 69 | static const struct rpmsg_endpoint_ops qcom_smd_endpoint_ops; |
| 70 | |
| 71 | #define SMD_ALLOC_TBL_COUNT 2 |
| 72 | #define SMD_ALLOC_TBL_SIZE 64 |
| 73 | |
| 74 | /* |
| 75 | * This lists the various smem heap items relevant for the allocation table and |
| 76 | * smd channel entries. |
| 77 | */ |
| 78 | static const struct { |
| 79 | unsigned alloc_tbl_id; |
| 80 | unsigned info_base_id; |
| 81 | unsigned fifo_base_id; |
| 82 | } smem_items[SMD_ALLOC_TBL_COUNT] = { |
| 83 | { |
| 84 | .alloc_tbl_id = 13, |
| 85 | .info_base_id = 14, |
| 86 | .fifo_base_id = 338 |
| 87 | }, |
| 88 | { |
| 89 | .alloc_tbl_id = 266, |
| 90 | .info_base_id = 138, |
| 91 | .fifo_base_id = 202, |
| 92 | }, |
| 93 | }; |
| 94 | |
| 95 | /** |
| 96 | * struct qcom_smd_edge - representing a remote processor |
Srinivas Kandagatla | 82eca59 | 2018-06-18 13:33:39 +0100 | [diff] [blame] | 97 | * @dev: device associated with this edge |
| 98 | * @name: name of this edge |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 99 | * @of_node: of_node handle for information related to this edge |
| 100 | * @edge_id: identifier of this edge |
| 101 | * @remote_pid: identifier of remote processor |
| 102 | * @irq: interrupt for signals on this edge |
| 103 | * @ipc_regmap: regmap handle holding the outgoing ipc register |
| 104 | * @ipc_offset: offset within @ipc_regmap of the register for ipc |
| 105 | * @ipc_bit: bit in the register at @ipc_offset of @ipc_regmap |
Bjorn Andersson | ab460a2 | 2018-04-19 18:17:57 -0700 | [diff] [blame] | 106 | * @mbox_client: mailbox client handle |
| 107 | * @mbox_chan: apcs ipc mailbox channel handle |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 108 | * @channels: list of all channels detected on this edge |
| 109 | * @channels_lock: guard for modifications of @channels |
| 110 | * @allocated: array of bitmaps representing already allocated channels |
| 111 | * @smem_available: last available amount of smem triggering a channel scan |
Srinivas Kandagatla | 82eca59 | 2018-06-18 13:33:39 +0100 | [diff] [blame] | 112 | * @new_channel_event: wait queue for new channel events |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 113 | * @scan_work: work item for discovering new channels |
| 114 | * @state_work: work item for edge state changes |
| 115 | */ |
| 116 | struct qcom_smd_edge { |
| 117 | struct device dev; |
| 118 | |
Bjorn Andersson | 5e53c42 | 2016-12-02 14:06:02 -0800 | [diff] [blame] | 119 | const char *name; |
| 120 | |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 121 | struct device_node *of_node; |
| 122 | unsigned edge_id; |
| 123 | unsigned remote_pid; |
| 124 | |
| 125 | int irq; |
| 126 | |
| 127 | struct regmap *ipc_regmap; |
| 128 | int ipc_offset; |
| 129 | int ipc_bit; |
| 130 | |
Bjorn Andersson | ab460a2 | 2018-04-19 18:17:57 -0700 | [diff] [blame] | 131 | struct mbox_client mbox_client; |
| 132 | struct mbox_chan *mbox_chan; |
| 133 | |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 134 | struct list_head channels; |
| 135 | spinlock_t channels_lock; |
| 136 | |
| 137 | DECLARE_BITMAP(allocated[SMD_ALLOC_TBL_COUNT], SMD_ALLOC_TBL_SIZE); |
| 138 | |
| 139 | unsigned smem_available; |
| 140 | |
| 141 | wait_queue_head_t new_channel_event; |
| 142 | |
| 143 | struct work_struct scan_work; |
| 144 | struct work_struct state_work; |
| 145 | }; |
| 146 | |
| 147 | /* |
| 148 | * SMD channel states. |
| 149 | */ |
| 150 | enum smd_channel_state { |
| 151 | SMD_CHANNEL_CLOSED, |
| 152 | SMD_CHANNEL_OPENING, |
| 153 | SMD_CHANNEL_OPENED, |
| 154 | SMD_CHANNEL_FLUSHING, |
| 155 | SMD_CHANNEL_CLOSING, |
| 156 | SMD_CHANNEL_RESET, |
| 157 | SMD_CHANNEL_RESET_OPENING |
| 158 | }; |
| 159 | |
| 160 | struct qcom_smd_device { |
| 161 | struct rpmsg_device rpdev; |
| 162 | |
| 163 | struct qcom_smd_edge *edge; |
| 164 | }; |
| 165 | |
| 166 | struct qcom_smd_endpoint { |
| 167 | struct rpmsg_endpoint ept; |
| 168 | |
| 169 | struct qcom_smd_channel *qsch; |
| 170 | }; |
| 171 | |
Bjorn Andersson | 6ddf12d | 2018-03-27 14:06:41 -0700 | [diff] [blame] | 172 | #define to_smd_device(r) container_of(r, struct qcom_smd_device, rpdev) |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 173 | #define to_smd_edge(d) container_of(d, struct qcom_smd_edge, dev) |
Bjorn Andersson | 6ddf12d | 2018-03-27 14:06:41 -0700 | [diff] [blame] | 174 | #define to_smd_endpoint(e) container_of(e, struct qcom_smd_endpoint, ept) |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 175 | |
| 176 | /** |
| 177 | * struct qcom_smd_channel - smd channel struct |
| 178 | * @edge: qcom_smd_edge this channel is living on |
Srinivas Kandagatla | 82eca59 | 2018-06-18 13:33:39 +0100 | [diff] [blame] | 179 | * @qsept: reference to a associated smd endpoint |
| 180 | * @registered: flag to indicate if the channel is registered |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 181 | * @name: name of the channel |
| 182 | * @state: local state of the channel |
| 183 | * @remote_state: remote state of the channel |
Srinivas Kandagatla | 82eca59 | 2018-06-18 13:33:39 +0100 | [diff] [blame] | 184 | * @state_change_event: state change event |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 185 | * @info: byte aligned outgoing/incoming channel info |
| 186 | * @info_word: word aligned outgoing/incoming channel info |
| 187 | * @tx_lock: lock to make writes to the channel mutually exclusive |
| 188 | * @fblockread_event: wakeup event tied to tx fBLOCKREADINTR |
| 189 | * @tx_fifo: pointer to the outgoing ring buffer |
| 190 | * @rx_fifo: pointer to the incoming ring buffer |
| 191 | * @fifo_size: size of each ring buffer |
| 192 | * @bounce_buffer: bounce buffer for reading wrapped packets |
| 193 | * @cb: callback function registered for this channel |
| 194 | * @recv_lock: guard for rx info modifications and cb pointer |
| 195 | * @pkt_size: size of the currently handled packet |
Srinivas Kandagatla | 82eca59 | 2018-06-18 13:33:39 +0100 | [diff] [blame] | 196 | * @drvdata: driver private data |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 197 | * @list: lite entry for @channels in qcom_smd_edge |
| 198 | */ |
| 199 | struct qcom_smd_channel { |
| 200 | struct qcom_smd_edge *edge; |
| 201 | |
| 202 | struct qcom_smd_endpoint *qsept; |
| 203 | bool registered; |
| 204 | |
| 205 | char *name; |
| 206 | enum smd_channel_state state; |
| 207 | enum smd_channel_state remote_state; |
Bjorn Andersson | 268105f | 2017-12-12 15:58:53 -0800 | [diff] [blame] | 208 | wait_queue_head_t state_change_event; |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 209 | |
| 210 | struct smd_channel_info_pair *info; |
| 211 | struct smd_channel_info_word_pair *info_word; |
| 212 | |
Bjorn Andersson | 33e3820 | 2018-02-13 11:04:11 -0800 | [diff] [blame] | 213 | spinlock_t tx_lock; |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 214 | wait_queue_head_t fblockread_event; |
| 215 | |
| 216 | void *tx_fifo; |
| 217 | void *rx_fifo; |
| 218 | int fifo_size; |
| 219 | |
| 220 | void *bounce_buffer; |
| 221 | |
| 222 | spinlock_t recv_lock; |
| 223 | |
| 224 | int pkt_size; |
| 225 | |
| 226 | void *drvdata; |
| 227 | |
| 228 | struct list_head list; |
| 229 | }; |
| 230 | |
| 231 | /* |
| 232 | * Format of the smd_info smem items, for byte aligned channels. |
| 233 | */ |
| 234 | struct smd_channel_info { |
| 235 | __le32 state; |
| 236 | u8 fDSR; |
| 237 | u8 fCTS; |
| 238 | u8 fCD; |
| 239 | u8 fRI; |
| 240 | u8 fHEAD; |
| 241 | u8 fTAIL; |
| 242 | u8 fSTATE; |
| 243 | u8 fBLOCKREADINTR; |
| 244 | __le32 tail; |
| 245 | __le32 head; |
| 246 | }; |
| 247 | |
| 248 | struct smd_channel_info_pair { |
| 249 | struct smd_channel_info tx; |
| 250 | struct smd_channel_info rx; |
| 251 | }; |
| 252 | |
| 253 | /* |
| 254 | * Format of the smd_info smem items, for word aligned channels. |
| 255 | */ |
| 256 | struct smd_channel_info_word { |
| 257 | __le32 state; |
| 258 | __le32 fDSR; |
| 259 | __le32 fCTS; |
| 260 | __le32 fCD; |
| 261 | __le32 fRI; |
| 262 | __le32 fHEAD; |
| 263 | __le32 fTAIL; |
| 264 | __le32 fSTATE; |
| 265 | __le32 fBLOCKREADINTR; |
| 266 | __le32 tail; |
| 267 | __le32 head; |
| 268 | }; |
| 269 | |
| 270 | struct smd_channel_info_word_pair { |
| 271 | struct smd_channel_info_word tx; |
| 272 | struct smd_channel_info_word rx; |
| 273 | }; |
| 274 | |
| 275 | #define GET_RX_CHANNEL_FLAG(channel, param) \ |
| 276 | ({ \ |
| 277 | BUILD_BUG_ON(sizeof(channel->info->rx.param) != sizeof(u8)); \ |
| 278 | channel->info_word ? \ |
| 279 | le32_to_cpu(channel->info_word->rx.param) : \ |
| 280 | channel->info->rx.param; \ |
| 281 | }) |
| 282 | |
| 283 | #define GET_RX_CHANNEL_INFO(channel, param) \ |
| 284 | ({ \ |
| 285 | BUILD_BUG_ON(sizeof(channel->info->rx.param) != sizeof(u32)); \ |
| 286 | le32_to_cpu(channel->info_word ? \ |
| 287 | channel->info_word->rx.param : \ |
| 288 | channel->info->rx.param); \ |
| 289 | }) |
| 290 | |
| 291 | #define SET_RX_CHANNEL_FLAG(channel, param, value) \ |
| 292 | ({ \ |
| 293 | BUILD_BUG_ON(sizeof(channel->info->rx.param) != sizeof(u8)); \ |
| 294 | if (channel->info_word) \ |
| 295 | channel->info_word->rx.param = cpu_to_le32(value); \ |
| 296 | else \ |
| 297 | channel->info->rx.param = value; \ |
| 298 | }) |
| 299 | |
| 300 | #define SET_RX_CHANNEL_INFO(channel, param, value) \ |
| 301 | ({ \ |
| 302 | BUILD_BUG_ON(sizeof(channel->info->rx.param) != sizeof(u32)); \ |
| 303 | if (channel->info_word) \ |
| 304 | channel->info_word->rx.param = cpu_to_le32(value); \ |
| 305 | else \ |
| 306 | channel->info->rx.param = cpu_to_le32(value); \ |
| 307 | }) |
| 308 | |
| 309 | #define GET_TX_CHANNEL_FLAG(channel, param) \ |
| 310 | ({ \ |
| 311 | BUILD_BUG_ON(sizeof(channel->info->tx.param) != sizeof(u8)); \ |
| 312 | channel->info_word ? \ |
| 313 | le32_to_cpu(channel->info_word->tx.param) : \ |
| 314 | channel->info->tx.param; \ |
| 315 | }) |
| 316 | |
| 317 | #define GET_TX_CHANNEL_INFO(channel, param) \ |
| 318 | ({ \ |
| 319 | BUILD_BUG_ON(sizeof(channel->info->tx.param) != sizeof(u32)); \ |
| 320 | le32_to_cpu(channel->info_word ? \ |
| 321 | channel->info_word->tx.param : \ |
| 322 | channel->info->tx.param); \ |
| 323 | }) |
| 324 | |
| 325 | #define SET_TX_CHANNEL_FLAG(channel, param, value) \ |
| 326 | ({ \ |
| 327 | BUILD_BUG_ON(sizeof(channel->info->tx.param) != sizeof(u8)); \ |
| 328 | if (channel->info_word) \ |
| 329 | channel->info_word->tx.param = cpu_to_le32(value); \ |
| 330 | else \ |
| 331 | channel->info->tx.param = value; \ |
| 332 | }) |
| 333 | |
| 334 | #define SET_TX_CHANNEL_INFO(channel, param, value) \ |
| 335 | ({ \ |
| 336 | BUILD_BUG_ON(sizeof(channel->info->tx.param) != sizeof(u32)); \ |
| 337 | if (channel->info_word) \ |
| 338 | channel->info_word->tx.param = cpu_to_le32(value); \ |
| 339 | else \ |
| 340 | channel->info->tx.param = cpu_to_le32(value); \ |
| 341 | }) |
| 342 | |
| 343 | /** |
| 344 | * struct qcom_smd_alloc_entry - channel allocation entry |
| 345 | * @name: channel name |
| 346 | * @cid: channel index |
| 347 | * @flags: channel flags and edge id |
| 348 | * @ref_count: reference count of the channel |
| 349 | */ |
| 350 | struct qcom_smd_alloc_entry { |
| 351 | u8 name[20]; |
| 352 | __le32 cid; |
| 353 | __le32 flags; |
| 354 | __le32 ref_count; |
| 355 | } __packed; |
| 356 | |
| 357 | #define SMD_CHANNEL_FLAGS_EDGE_MASK 0xff |
| 358 | #define SMD_CHANNEL_FLAGS_STREAM BIT(8) |
| 359 | #define SMD_CHANNEL_FLAGS_PACKET BIT(9) |
| 360 | |
| 361 | /* |
| 362 | * Each smd packet contains a 20 byte header, with the first 4 being the length |
| 363 | * of the packet. |
| 364 | */ |
| 365 | #define SMD_PACKET_HEADER_LEN 20 |
| 366 | |
| 367 | /* |
| 368 | * Signal the remote processor associated with 'channel'. |
| 369 | */ |
| 370 | static void qcom_smd_signal_channel(struct qcom_smd_channel *channel) |
| 371 | { |
| 372 | struct qcom_smd_edge *edge = channel->edge; |
| 373 | |
Bjorn Andersson | ab460a2 | 2018-04-19 18:17:57 -0700 | [diff] [blame] | 374 | if (edge->mbox_chan) { |
| 375 | /* |
| 376 | * We can ignore a failing mbox_send_message() as the only |
| 377 | * possible cause is that the FIFO in the framework is full of |
| 378 | * other writes to the same bit. |
| 379 | */ |
| 380 | mbox_send_message(edge->mbox_chan, NULL); |
| 381 | mbox_client_txdone(edge->mbox_chan, 0); |
| 382 | } else { |
| 383 | regmap_write(edge->ipc_regmap, edge->ipc_offset, BIT(edge->ipc_bit)); |
| 384 | } |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 385 | } |
| 386 | |
| 387 | /* |
| 388 | * Initialize the tx channel info |
| 389 | */ |
| 390 | static void qcom_smd_channel_reset(struct qcom_smd_channel *channel) |
| 391 | { |
| 392 | SET_TX_CHANNEL_INFO(channel, state, SMD_CHANNEL_CLOSED); |
| 393 | SET_TX_CHANNEL_FLAG(channel, fDSR, 0); |
| 394 | SET_TX_CHANNEL_FLAG(channel, fCTS, 0); |
| 395 | SET_TX_CHANNEL_FLAG(channel, fCD, 0); |
| 396 | SET_TX_CHANNEL_FLAG(channel, fRI, 0); |
| 397 | SET_TX_CHANNEL_FLAG(channel, fHEAD, 0); |
| 398 | SET_TX_CHANNEL_FLAG(channel, fTAIL, 0); |
| 399 | SET_TX_CHANNEL_FLAG(channel, fSTATE, 1); |
| 400 | SET_TX_CHANNEL_FLAG(channel, fBLOCKREADINTR, 1); |
| 401 | SET_TX_CHANNEL_INFO(channel, head, 0); |
| 402 | SET_RX_CHANNEL_INFO(channel, tail, 0); |
| 403 | |
| 404 | qcom_smd_signal_channel(channel); |
| 405 | |
| 406 | channel->state = SMD_CHANNEL_CLOSED; |
| 407 | channel->pkt_size = 0; |
| 408 | } |
| 409 | |
| 410 | /* |
| 411 | * Set the callback for a channel, with appropriate locking |
| 412 | */ |
| 413 | static void qcom_smd_channel_set_callback(struct qcom_smd_channel *channel, |
| 414 | rpmsg_rx_cb_t cb) |
| 415 | { |
| 416 | struct rpmsg_endpoint *ept = &channel->qsept->ept; |
| 417 | unsigned long flags; |
| 418 | |
| 419 | spin_lock_irqsave(&channel->recv_lock, flags); |
| 420 | ept->cb = cb; |
| 421 | spin_unlock_irqrestore(&channel->recv_lock, flags); |
| 422 | }; |
| 423 | |
| 424 | /* |
| 425 | * Calculate the amount of data available in the rx fifo |
| 426 | */ |
| 427 | static size_t qcom_smd_channel_get_rx_avail(struct qcom_smd_channel *channel) |
| 428 | { |
| 429 | unsigned head; |
| 430 | unsigned tail; |
| 431 | |
| 432 | head = GET_RX_CHANNEL_INFO(channel, head); |
| 433 | tail = GET_RX_CHANNEL_INFO(channel, tail); |
| 434 | |
| 435 | return (head - tail) & (channel->fifo_size - 1); |
| 436 | } |
| 437 | |
| 438 | /* |
| 439 | * Set tx channel state and inform the remote processor |
| 440 | */ |
| 441 | static void qcom_smd_channel_set_state(struct qcom_smd_channel *channel, |
| 442 | int state) |
| 443 | { |
| 444 | struct qcom_smd_edge *edge = channel->edge; |
| 445 | bool is_open = state == SMD_CHANNEL_OPENED; |
| 446 | |
| 447 | if (channel->state == state) |
| 448 | return; |
| 449 | |
| 450 | dev_dbg(&edge->dev, "set_state(%s, %d)\n", channel->name, state); |
| 451 | |
| 452 | SET_TX_CHANNEL_FLAG(channel, fDSR, is_open); |
| 453 | SET_TX_CHANNEL_FLAG(channel, fCTS, is_open); |
| 454 | SET_TX_CHANNEL_FLAG(channel, fCD, is_open); |
| 455 | |
| 456 | SET_TX_CHANNEL_INFO(channel, state, state); |
| 457 | SET_TX_CHANNEL_FLAG(channel, fSTATE, 1); |
| 458 | |
| 459 | channel->state = state; |
| 460 | qcom_smd_signal_channel(channel); |
| 461 | } |
| 462 | |
| 463 | /* |
| 464 | * Copy count bytes of data using 32bit accesses, if that's required. |
| 465 | */ |
| 466 | static void smd_copy_to_fifo(void __iomem *dst, |
| 467 | const void *src, |
| 468 | size_t count, |
| 469 | bool word_aligned) |
| 470 | { |
| 471 | if (word_aligned) { |
| 472 | __iowrite32_copy(dst, src, count / sizeof(u32)); |
| 473 | } else { |
| 474 | memcpy_toio(dst, src, count); |
| 475 | } |
| 476 | } |
| 477 | |
| 478 | /* |
| 479 | * Copy count bytes of data using 32bit accesses, if that is required. |
| 480 | */ |
| 481 | static void smd_copy_from_fifo(void *dst, |
| 482 | const void __iomem *src, |
| 483 | size_t count, |
| 484 | bool word_aligned) |
| 485 | { |
| 486 | if (word_aligned) { |
| 487 | __ioread32_copy(dst, src, count / sizeof(u32)); |
| 488 | } else { |
| 489 | memcpy_fromio(dst, src, count); |
| 490 | } |
| 491 | } |
| 492 | |
| 493 | /* |
| 494 | * Read count bytes of data from the rx fifo into buf, but don't advance the |
| 495 | * tail. |
| 496 | */ |
| 497 | static size_t qcom_smd_channel_peek(struct qcom_smd_channel *channel, |
| 498 | void *buf, size_t count) |
| 499 | { |
| 500 | bool word_aligned; |
| 501 | unsigned tail; |
| 502 | size_t len; |
| 503 | |
| 504 | word_aligned = channel->info_word; |
| 505 | tail = GET_RX_CHANNEL_INFO(channel, tail); |
| 506 | |
| 507 | len = min_t(size_t, count, channel->fifo_size - tail); |
| 508 | if (len) { |
| 509 | smd_copy_from_fifo(buf, |
| 510 | channel->rx_fifo + tail, |
| 511 | len, |
| 512 | word_aligned); |
| 513 | } |
| 514 | |
| 515 | if (len != count) { |
| 516 | smd_copy_from_fifo(buf + len, |
| 517 | channel->rx_fifo, |
| 518 | count - len, |
| 519 | word_aligned); |
| 520 | } |
| 521 | |
| 522 | return count; |
| 523 | } |
| 524 | |
| 525 | /* |
| 526 | * Advance the rx tail by count bytes. |
| 527 | */ |
| 528 | static void qcom_smd_channel_advance(struct qcom_smd_channel *channel, |
| 529 | size_t count) |
| 530 | { |
| 531 | unsigned tail; |
| 532 | |
| 533 | tail = GET_RX_CHANNEL_INFO(channel, tail); |
| 534 | tail += count; |
| 535 | tail &= (channel->fifo_size - 1); |
| 536 | SET_RX_CHANNEL_INFO(channel, tail, tail); |
| 537 | } |
| 538 | |
| 539 | /* |
| 540 | * Read out a single packet from the rx fifo and deliver it to the device |
| 541 | */ |
| 542 | static int qcom_smd_channel_recv_single(struct qcom_smd_channel *channel) |
| 543 | { |
| 544 | struct rpmsg_endpoint *ept = &channel->qsept->ept; |
| 545 | unsigned tail; |
| 546 | size_t len; |
| 547 | void *ptr; |
| 548 | int ret; |
| 549 | |
| 550 | tail = GET_RX_CHANNEL_INFO(channel, tail); |
| 551 | |
| 552 | /* Use bounce buffer if the data wraps */ |
| 553 | if (tail + channel->pkt_size >= channel->fifo_size) { |
| 554 | ptr = channel->bounce_buffer; |
| 555 | len = qcom_smd_channel_peek(channel, ptr, channel->pkt_size); |
| 556 | } else { |
| 557 | ptr = channel->rx_fifo + tail; |
| 558 | len = channel->pkt_size; |
| 559 | } |
| 560 | |
| 561 | ret = ept->cb(ept->rpdev, ptr, len, ept->priv, RPMSG_ADDR_ANY); |
| 562 | if (ret < 0) |
| 563 | return ret; |
| 564 | |
| 565 | /* Only forward the tail if the client consumed the data */ |
| 566 | qcom_smd_channel_advance(channel, len); |
| 567 | |
| 568 | channel->pkt_size = 0; |
| 569 | |
| 570 | return 0; |
| 571 | } |
| 572 | |
| 573 | /* |
| 574 | * Per channel interrupt handling |
| 575 | */ |
| 576 | static bool qcom_smd_channel_intr(struct qcom_smd_channel *channel) |
| 577 | { |
| 578 | bool need_state_scan = false; |
| 579 | int remote_state; |
| 580 | __le32 pktlen; |
| 581 | int avail; |
| 582 | int ret; |
| 583 | |
| 584 | /* Handle state changes */ |
| 585 | remote_state = GET_RX_CHANNEL_INFO(channel, state); |
| 586 | if (remote_state != channel->remote_state) { |
| 587 | channel->remote_state = remote_state; |
| 588 | need_state_scan = true; |
Bjorn Andersson | 268105f | 2017-12-12 15:58:53 -0800 | [diff] [blame] | 589 | |
| 590 | wake_up_interruptible_all(&channel->state_change_event); |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 591 | } |
| 592 | /* Indicate that we have seen any state change */ |
| 593 | SET_RX_CHANNEL_FLAG(channel, fSTATE, 0); |
| 594 | |
| 595 | /* Signal waiting qcom_smd_send() about the interrupt */ |
| 596 | if (!GET_TX_CHANNEL_FLAG(channel, fBLOCKREADINTR)) |
Bjorn Andersson | eb114f2 | 2017-12-12 15:58:55 -0800 | [diff] [blame] | 597 | wake_up_interruptible_all(&channel->fblockread_event); |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 598 | |
| 599 | /* Don't consume any data until we've opened the channel */ |
| 600 | if (channel->state != SMD_CHANNEL_OPENED) |
| 601 | goto out; |
| 602 | |
| 603 | /* Indicate that we've seen the new data */ |
| 604 | SET_RX_CHANNEL_FLAG(channel, fHEAD, 0); |
| 605 | |
| 606 | /* Consume data */ |
| 607 | for (;;) { |
| 608 | avail = qcom_smd_channel_get_rx_avail(channel); |
| 609 | |
| 610 | if (!channel->pkt_size && avail >= SMD_PACKET_HEADER_LEN) { |
| 611 | qcom_smd_channel_peek(channel, &pktlen, sizeof(pktlen)); |
| 612 | qcom_smd_channel_advance(channel, SMD_PACKET_HEADER_LEN); |
| 613 | channel->pkt_size = le32_to_cpu(pktlen); |
| 614 | } else if (channel->pkt_size && avail >= channel->pkt_size) { |
| 615 | ret = qcom_smd_channel_recv_single(channel); |
| 616 | if (ret) |
| 617 | break; |
| 618 | } else { |
| 619 | break; |
| 620 | } |
| 621 | } |
| 622 | |
| 623 | /* Indicate that we have seen and updated tail */ |
| 624 | SET_RX_CHANNEL_FLAG(channel, fTAIL, 1); |
| 625 | |
| 626 | /* Signal the remote that we've consumed the data (if requested) */ |
| 627 | if (!GET_RX_CHANNEL_FLAG(channel, fBLOCKREADINTR)) { |
| 628 | /* Ensure ordering of channel info updates */ |
| 629 | wmb(); |
| 630 | |
| 631 | qcom_smd_signal_channel(channel); |
| 632 | } |
| 633 | |
| 634 | out: |
| 635 | return need_state_scan; |
| 636 | } |
| 637 | |
| 638 | /* |
| 639 | * The edge interrupts are triggered by the remote processor on state changes, |
| 640 | * channel info updates or when new channels are created. |
| 641 | */ |
| 642 | static irqreturn_t qcom_smd_edge_intr(int irq, void *data) |
| 643 | { |
| 644 | struct qcom_smd_edge *edge = data; |
| 645 | struct qcom_smd_channel *channel; |
| 646 | unsigned available; |
| 647 | bool kick_scanner = false; |
| 648 | bool kick_state = false; |
| 649 | |
| 650 | /* |
| 651 | * Handle state changes or data on each of the channels on this edge |
| 652 | */ |
| 653 | spin_lock(&edge->channels_lock); |
| 654 | list_for_each_entry(channel, &edge->channels, list) { |
| 655 | spin_lock(&channel->recv_lock); |
| 656 | kick_state |= qcom_smd_channel_intr(channel); |
| 657 | spin_unlock(&channel->recv_lock); |
| 658 | } |
| 659 | spin_unlock(&edge->channels_lock); |
| 660 | |
| 661 | /* |
| 662 | * Creating a new channel requires allocating an smem entry, so we only |
| 663 | * have to scan if the amount of available space in smem have changed |
| 664 | * since last scan. |
| 665 | */ |
| 666 | available = qcom_smem_get_free_space(edge->remote_pid); |
| 667 | if (available != edge->smem_available) { |
| 668 | edge->smem_available = available; |
| 669 | kick_scanner = true; |
| 670 | } |
| 671 | |
| 672 | if (kick_scanner) |
| 673 | schedule_work(&edge->scan_work); |
| 674 | if (kick_state) |
| 675 | schedule_work(&edge->state_work); |
| 676 | |
| 677 | return IRQ_HANDLED; |
| 678 | } |
| 679 | |
| 680 | /* |
| 681 | * Calculate how much space is available in the tx fifo. |
| 682 | */ |
| 683 | static size_t qcom_smd_get_tx_avail(struct qcom_smd_channel *channel) |
| 684 | { |
| 685 | unsigned head; |
| 686 | unsigned tail; |
| 687 | unsigned mask = channel->fifo_size - 1; |
| 688 | |
| 689 | head = GET_TX_CHANNEL_INFO(channel, head); |
| 690 | tail = GET_TX_CHANNEL_INFO(channel, tail); |
| 691 | |
| 692 | return mask - ((head - tail) & mask); |
| 693 | } |
| 694 | |
| 695 | /* |
| 696 | * Write count bytes of data into channel, possibly wrapping in the ring buffer |
| 697 | */ |
| 698 | static int qcom_smd_write_fifo(struct qcom_smd_channel *channel, |
| 699 | const void *data, |
| 700 | size_t count) |
| 701 | { |
| 702 | bool word_aligned; |
| 703 | unsigned head; |
| 704 | size_t len; |
| 705 | |
| 706 | word_aligned = channel->info_word; |
| 707 | head = GET_TX_CHANNEL_INFO(channel, head); |
| 708 | |
| 709 | len = min_t(size_t, count, channel->fifo_size - head); |
| 710 | if (len) { |
| 711 | smd_copy_to_fifo(channel->tx_fifo + head, |
| 712 | data, |
| 713 | len, |
| 714 | word_aligned); |
| 715 | } |
| 716 | |
| 717 | if (len != count) { |
| 718 | smd_copy_to_fifo(channel->tx_fifo, |
| 719 | data + len, |
| 720 | count - len, |
| 721 | word_aligned); |
| 722 | } |
| 723 | |
| 724 | head += count; |
| 725 | head &= (channel->fifo_size - 1); |
| 726 | SET_TX_CHANNEL_INFO(channel, head, head); |
| 727 | |
| 728 | return count; |
| 729 | } |
| 730 | |
| 731 | /** |
| 732 | * qcom_smd_send - write data to smd channel |
| 733 | * @channel: channel handle |
| 734 | * @data: buffer of data to write |
| 735 | * @len: number of bytes to write |
Srinivas Kandagatla | 82eca59 | 2018-06-18 13:33:39 +0100 | [diff] [blame] | 736 | * @wait: flag to indicate if write has ca wait |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 737 | * |
| 738 | * This is a blocking write of len bytes into the channel's tx ring buffer and |
| 739 | * signal the remote end. It will sleep until there is enough space available |
| 740 | * in the tx buffer, utilizing the fBLOCKREADINTR signaling mechanism to avoid |
| 741 | * polling. |
| 742 | */ |
| 743 | static int __qcom_smd_send(struct qcom_smd_channel *channel, const void *data, |
| 744 | int len, bool wait) |
| 745 | { |
| 746 | __le32 hdr[5] = { cpu_to_le32(len), }; |
| 747 | int tlen = sizeof(hdr) + len; |
Bjorn Andersson | 33e3820 | 2018-02-13 11:04:11 -0800 | [diff] [blame] | 748 | unsigned long flags; |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 749 | int ret; |
| 750 | |
| 751 | /* Word aligned channels only accept word size aligned data */ |
| 752 | if (channel->info_word && len % 4) |
| 753 | return -EINVAL; |
| 754 | |
| 755 | /* Reject packets that are too big */ |
| 756 | if (tlen >= channel->fifo_size) |
| 757 | return -EINVAL; |
| 758 | |
Bjorn Andersson | 33e3820 | 2018-02-13 11:04:11 -0800 | [diff] [blame] | 759 | /* Highlight the fact that if we enter the loop below we might sleep */ |
| 760 | if (wait) |
| 761 | might_sleep(); |
| 762 | |
| 763 | spin_lock_irqsave(&channel->tx_lock, flags); |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 764 | |
Bjorn Andersson | b2c932e | 2017-12-12 15:58:56 -0800 | [diff] [blame] | 765 | while (qcom_smd_get_tx_avail(channel) < tlen && |
| 766 | channel->state == SMD_CHANNEL_OPENED) { |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 767 | if (!wait) { |
Bjorn Andersson | 1d74e7e | 2016-12-01 16:59:55 -0800 | [diff] [blame] | 768 | ret = -EAGAIN; |
Dan Carpenter | c3388a0 | 2018-01-19 16:22:36 +0300 | [diff] [blame] | 769 | goto out_unlock; |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 770 | } |
| 771 | |
| 772 | SET_TX_CHANNEL_FLAG(channel, fBLOCKREADINTR, 0); |
| 773 | |
Bjorn Andersson | 178f3f7 | 2017-12-12 15:58:57 -0800 | [diff] [blame] | 774 | /* Wait without holding the tx_lock */ |
Bjorn Andersson | 33e3820 | 2018-02-13 11:04:11 -0800 | [diff] [blame] | 775 | spin_unlock_irqrestore(&channel->tx_lock, flags); |
Bjorn Andersson | 178f3f7 | 2017-12-12 15:58:57 -0800 | [diff] [blame] | 776 | |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 777 | ret = wait_event_interruptible(channel->fblockread_event, |
| 778 | qcom_smd_get_tx_avail(channel) >= tlen || |
| 779 | channel->state != SMD_CHANNEL_OPENED); |
| 780 | if (ret) |
Dan Carpenter | c3388a0 | 2018-01-19 16:22:36 +0300 | [diff] [blame] | 781 | return ret; |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 782 | |
Bjorn Andersson | 33e3820 | 2018-02-13 11:04:11 -0800 | [diff] [blame] | 783 | spin_lock_irqsave(&channel->tx_lock, flags); |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 784 | |
| 785 | SET_TX_CHANNEL_FLAG(channel, fBLOCKREADINTR, 1); |
| 786 | } |
| 787 | |
Bjorn Andersson | b2c932e | 2017-12-12 15:58:56 -0800 | [diff] [blame] | 788 | /* Fail if the channel was closed */ |
| 789 | if (channel->state != SMD_CHANNEL_OPENED) { |
| 790 | ret = -EPIPE; |
Dan Carpenter | c3388a0 | 2018-01-19 16:22:36 +0300 | [diff] [blame] | 791 | goto out_unlock; |
Bjorn Andersson | b2c932e | 2017-12-12 15:58:56 -0800 | [diff] [blame] | 792 | } |
| 793 | |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 794 | SET_TX_CHANNEL_FLAG(channel, fTAIL, 0); |
| 795 | |
| 796 | qcom_smd_write_fifo(channel, hdr, sizeof(hdr)); |
| 797 | qcom_smd_write_fifo(channel, data, len); |
| 798 | |
| 799 | SET_TX_CHANNEL_FLAG(channel, fHEAD, 1); |
| 800 | |
| 801 | /* Ensure ordering of channel info updates */ |
| 802 | wmb(); |
| 803 | |
| 804 | qcom_smd_signal_channel(channel); |
| 805 | |
Dan Carpenter | c3388a0 | 2018-01-19 16:22:36 +0300 | [diff] [blame] | 806 | out_unlock: |
Bjorn Andersson | 33e3820 | 2018-02-13 11:04:11 -0800 | [diff] [blame] | 807 | spin_unlock_irqrestore(&channel->tx_lock, flags); |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 808 | |
| 809 | return ret; |
| 810 | } |
| 811 | |
| 812 | /* |
| 813 | * Helper for opening a channel |
| 814 | */ |
| 815 | static int qcom_smd_channel_open(struct qcom_smd_channel *channel, |
| 816 | rpmsg_rx_cb_t cb) |
| 817 | { |
Bjorn Andersson | 268105f | 2017-12-12 15:58:53 -0800 | [diff] [blame] | 818 | struct qcom_smd_edge *edge = channel->edge; |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 819 | size_t bb_size; |
Bjorn Andersson | 268105f | 2017-12-12 15:58:53 -0800 | [diff] [blame] | 820 | int ret; |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 821 | |
| 822 | /* |
| 823 | * Packets are maximum 4k, but reduce if the fifo is smaller |
| 824 | */ |
| 825 | bb_size = min(channel->fifo_size, SZ_4K); |
| 826 | channel->bounce_buffer = kmalloc(bb_size, GFP_KERNEL); |
| 827 | if (!channel->bounce_buffer) |
| 828 | return -ENOMEM; |
| 829 | |
| 830 | qcom_smd_channel_set_callback(channel, cb); |
| 831 | qcom_smd_channel_set_state(channel, SMD_CHANNEL_OPENING); |
Bjorn Andersson | 268105f | 2017-12-12 15:58:53 -0800 | [diff] [blame] | 832 | |
| 833 | /* Wait for remote to enter opening or opened */ |
| 834 | ret = wait_event_interruptible_timeout(channel->state_change_event, |
| 835 | channel->remote_state == SMD_CHANNEL_OPENING || |
| 836 | channel->remote_state == SMD_CHANNEL_OPENED, |
| 837 | HZ); |
| 838 | if (!ret) { |
| 839 | dev_err(&edge->dev, "remote side did not enter opening state\n"); |
| 840 | goto out_close_timeout; |
| 841 | } |
| 842 | |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 843 | qcom_smd_channel_set_state(channel, SMD_CHANNEL_OPENED); |
| 844 | |
Bjorn Andersson | 268105f | 2017-12-12 15:58:53 -0800 | [diff] [blame] | 845 | /* Wait for remote to enter opened */ |
| 846 | ret = wait_event_interruptible_timeout(channel->state_change_event, |
| 847 | channel->remote_state == SMD_CHANNEL_OPENED, |
| 848 | HZ); |
| 849 | if (!ret) { |
| 850 | dev_err(&edge->dev, "remote side did not enter open state\n"); |
| 851 | goto out_close_timeout; |
| 852 | } |
| 853 | |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 854 | return 0; |
Bjorn Andersson | 268105f | 2017-12-12 15:58:53 -0800 | [diff] [blame] | 855 | |
| 856 | out_close_timeout: |
| 857 | qcom_smd_channel_set_state(channel, SMD_CHANNEL_CLOSED); |
| 858 | return -ETIMEDOUT; |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 859 | } |
| 860 | |
| 861 | /* |
| 862 | * Helper for closing and resetting a channel |
| 863 | */ |
| 864 | static void qcom_smd_channel_close(struct qcom_smd_channel *channel) |
| 865 | { |
| 866 | qcom_smd_channel_set_callback(channel, NULL); |
| 867 | |
| 868 | kfree(channel->bounce_buffer); |
| 869 | channel->bounce_buffer = NULL; |
| 870 | |
| 871 | qcom_smd_channel_set_state(channel, SMD_CHANNEL_CLOSED); |
| 872 | qcom_smd_channel_reset(channel); |
| 873 | } |
| 874 | |
| 875 | static struct qcom_smd_channel * |
| 876 | qcom_smd_find_channel(struct qcom_smd_edge *edge, const char *name) |
| 877 | { |
| 878 | struct qcom_smd_channel *channel; |
| 879 | struct qcom_smd_channel *ret = NULL; |
| 880 | unsigned long flags; |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 881 | |
| 882 | spin_lock_irqsave(&edge->channels_lock, flags); |
| 883 | list_for_each_entry(channel, &edge->channels, list) { |
Bjorn Andersson | 66dca39 | 2016-10-07 21:23:11 -0700 | [diff] [blame] | 884 | if (!strcmp(channel->name, name)) { |
| 885 | ret = channel; |
| 886 | break; |
| 887 | } |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 888 | } |
| 889 | spin_unlock_irqrestore(&edge->channels_lock, flags); |
| 890 | |
| 891 | return ret; |
| 892 | } |
| 893 | |
| 894 | static void __ept_release(struct kref *kref) |
| 895 | { |
| 896 | struct rpmsg_endpoint *ept = container_of(kref, struct rpmsg_endpoint, |
| 897 | refcount); |
| 898 | kfree(to_smd_endpoint(ept)); |
| 899 | } |
| 900 | |
| 901 | static struct rpmsg_endpoint *qcom_smd_create_ept(struct rpmsg_device *rpdev, |
| 902 | rpmsg_rx_cb_t cb, void *priv, |
| 903 | struct rpmsg_channel_info chinfo) |
| 904 | { |
| 905 | struct qcom_smd_endpoint *qsept; |
| 906 | struct qcom_smd_channel *channel; |
| 907 | struct qcom_smd_device *qsdev = to_smd_device(rpdev); |
| 908 | struct qcom_smd_edge *edge = qsdev->edge; |
| 909 | struct rpmsg_endpoint *ept; |
| 910 | const char *name = chinfo.name; |
| 911 | int ret; |
| 912 | |
| 913 | /* Wait up to HZ for the channel to appear */ |
| 914 | ret = wait_event_interruptible_timeout(edge->new_channel_event, |
| 915 | (channel = qcom_smd_find_channel(edge, name)) != NULL, |
| 916 | HZ); |
| 917 | if (!ret) |
| 918 | return NULL; |
| 919 | |
| 920 | if (channel->state != SMD_CHANNEL_CLOSED) { |
| 921 | dev_err(&rpdev->dev, "channel %s is busy\n", channel->name); |
| 922 | return NULL; |
| 923 | } |
| 924 | |
| 925 | qsept = kzalloc(sizeof(*qsept), GFP_KERNEL); |
| 926 | if (!qsept) |
| 927 | return NULL; |
| 928 | |
| 929 | ept = &qsept->ept; |
| 930 | |
| 931 | kref_init(&ept->refcount); |
| 932 | |
| 933 | ept->rpdev = rpdev; |
| 934 | ept->cb = cb; |
| 935 | ept->priv = priv; |
| 936 | ept->ops = &qcom_smd_endpoint_ops; |
| 937 | |
| 938 | channel->qsept = qsept; |
| 939 | qsept->qsch = channel; |
| 940 | |
| 941 | ret = qcom_smd_channel_open(channel, cb); |
| 942 | if (ret) |
| 943 | goto free_ept; |
| 944 | |
| 945 | return ept; |
| 946 | |
| 947 | free_ept: |
| 948 | channel->qsept = NULL; |
| 949 | kref_put(&ept->refcount, __ept_release); |
| 950 | return NULL; |
| 951 | } |
| 952 | |
| 953 | static void qcom_smd_destroy_ept(struct rpmsg_endpoint *ept) |
| 954 | { |
| 955 | struct qcom_smd_endpoint *qsept = to_smd_endpoint(ept); |
| 956 | struct qcom_smd_channel *ch = qsept->qsch; |
| 957 | |
| 958 | qcom_smd_channel_close(ch); |
| 959 | ch->qsept = NULL; |
| 960 | kref_put(&ept->refcount, __ept_release); |
| 961 | } |
| 962 | |
| 963 | static int qcom_smd_send(struct rpmsg_endpoint *ept, void *data, int len) |
| 964 | { |
| 965 | struct qcom_smd_endpoint *qsept = to_smd_endpoint(ept); |
| 966 | |
| 967 | return __qcom_smd_send(qsept->qsch, data, len, true); |
| 968 | } |
| 969 | |
| 970 | static int qcom_smd_trysend(struct rpmsg_endpoint *ept, void *data, int len) |
| 971 | { |
| 972 | struct qcom_smd_endpoint *qsept = to_smd_endpoint(ept); |
| 973 | |
| 974 | return __qcom_smd_send(qsept->qsch, data, len, false); |
| 975 | } |
| 976 | |
Arnaud Pouliquen | b4ce7e2 | 2021-03-11 15:04:11 +0100 | [diff] [blame] | 977 | static int qcom_smd_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst) |
| 978 | { |
| 979 | struct qcom_smd_endpoint *qsept = to_smd_endpoint(ept); |
| 980 | |
| 981 | return __qcom_smd_send(qsept->qsch, data, len, true); |
| 982 | } |
| 983 | |
| 984 | static int qcom_smd_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst) |
| 985 | { |
| 986 | struct qcom_smd_endpoint *qsept = to_smd_endpoint(ept); |
| 987 | |
| 988 | return __qcom_smd_send(qsept->qsch, data, len, false); |
| 989 | } |
| 990 | |
Al Viro | afc9a42 | 2017-07-03 06:39:46 -0400 | [diff] [blame] | 991 | static __poll_t qcom_smd_poll(struct rpmsg_endpoint *ept, |
Bjorn Andersson | adaa11b | 2017-01-11 06:35:11 -0800 | [diff] [blame] | 992 | struct file *filp, poll_table *wait) |
| 993 | { |
| 994 | struct qcom_smd_endpoint *qsept = to_smd_endpoint(ept); |
| 995 | struct qcom_smd_channel *channel = qsept->qsch; |
Al Viro | afc9a42 | 2017-07-03 06:39:46 -0400 | [diff] [blame] | 996 | __poll_t mask = 0; |
Bjorn Andersson | adaa11b | 2017-01-11 06:35:11 -0800 | [diff] [blame] | 997 | |
| 998 | poll_wait(filp, &channel->fblockread_event, wait); |
| 999 | |
| 1000 | if (qcom_smd_get_tx_avail(channel) > 20) |
Linus Torvalds | a9a0884 | 2018-02-11 14:34:03 -0800 | [diff] [blame] | 1001 | mask |= EPOLLOUT | EPOLLWRNORM; |
Bjorn Andersson | adaa11b | 2017-01-11 06:35:11 -0800 | [diff] [blame] | 1002 | |
| 1003 | return mask; |
| 1004 | } |
| 1005 | |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1006 | /* |
| 1007 | * Finds the device_node for the smd child interested in this channel. |
| 1008 | */ |
| 1009 | static struct device_node *qcom_smd_match_channel(struct device_node *edge_node, |
| 1010 | const char *channel) |
| 1011 | { |
| 1012 | struct device_node *child; |
| 1013 | const char *name; |
| 1014 | const char *key; |
| 1015 | int ret; |
| 1016 | |
| 1017 | for_each_available_child_of_node(edge_node, child) { |
| 1018 | key = "qcom,smd-channels"; |
| 1019 | ret = of_property_read_string(child, key, &name); |
| 1020 | if (ret) |
| 1021 | continue; |
| 1022 | |
| 1023 | if (strcmp(name, channel) == 0) |
| 1024 | return child; |
| 1025 | } |
| 1026 | |
| 1027 | return NULL; |
| 1028 | } |
| 1029 | |
Bjorn Andersson | 0d72038 | 2018-03-27 14:06:43 -0700 | [diff] [blame] | 1030 | static int qcom_smd_announce_create(struct rpmsg_device *rpdev) |
| 1031 | { |
| 1032 | struct qcom_smd_endpoint *qept = to_smd_endpoint(rpdev->ept); |
| 1033 | struct qcom_smd_channel *channel = qept->qsch; |
| 1034 | unsigned long flags; |
| 1035 | bool kick_state; |
| 1036 | |
| 1037 | spin_lock_irqsave(&channel->recv_lock, flags); |
| 1038 | kick_state = qcom_smd_channel_intr(channel); |
| 1039 | spin_unlock_irqrestore(&channel->recv_lock, flags); |
| 1040 | |
| 1041 | if (kick_state) |
| 1042 | schedule_work(&channel->edge->state_work); |
| 1043 | |
| 1044 | return 0; |
| 1045 | } |
| 1046 | |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1047 | static const struct rpmsg_device_ops qcom_smd_device_ops = { |
| 1048 | .create_ept = qcom_smd_create_ept, |
Bjorn Andersson | 0d72038 | 2018-03-27 14:06:43 -0700 | [diff] [blame] | 1049 | .announce_create = qcom_smd_announce_create, |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1050 | }; |
| 1051 | |
| 1052 | static const struct rpmsg_endpoint_ops qcom_smd_endpoint_ops = { |
| 1053 | .destroy_ept = qcom_smd_destroy_ept, |
| 1054 | .send = qcom_smd_send, |
Arnaud Pouliquen | b4ce7e2 | 2021-03-11 15:04:11 +0100 | [diff] [blame] | 1055 | .sendto = qcom_smd_sendto, |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1056 | .trysend = qcom_smd_trysend, |
Arnaud Pouliquen | b4ce7e2 | 2021-03-11 15:04:11 +0100 | [diff] [blame] | 1057 | .trysendto = qcom_smd_trysendto, |
Bjorn Andersson | adaa11b | 2017-01-11 06:35:11 -0800 | [diff] [blame] | 1058 | .poll = qcom_smd_poll, |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1059 | }; |
| 1060 | |
Bjorn Andersson | b0b03b8 | 2017-03-15 22:18:35 -0700 | [diff] [blame] | 1061 | static void qcom_smd_release_device(struct device *dev) |
| 1062 | { |
| 1063 | struct rpmsg_device *rpdev = to_rpmsg_device(dev); |
| 1064 | struct qcom_smd_device *qsdev = to_smd_device(rpdev); |
| 1065 | |
| 1066 | kfree(qsdev); |
| 1067 | } |
| 1068 | |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1069 | /* |
| 1070 | * Create a smd client device for channel that is being opened. |
| 1071 | */ |
| 1072 | static int qcom_smd_create_device(struct qcom_smd_channel *channel) |
| 1073 | { |
| 1074 | struct qcom_smd_device *qsdev; |
| 1075 | struct rpmsg_device *rpdev; |
| 1076 | struct qcom_smd_edge *edge = channel->edge; |
| 1077 | |
| 1078 | dev_dbg(&edge->dev, "registering '%s'\n", channel->name); |
| 1079 | |
| 1080 | qsdev = kzalloc(sizeof(*qsdev), GFP_KERNEL); |
| 1081 | if (!qsdev) |
| 1082 | return -ENOMEM; |
| 1083 | |
| 1084 | /* Link qsdev to our SMD edge */ |
| 1085 | qsdev->edge = edge; |
| 1086 | |
| 1087 | /* Assign callbacks for rpmsg_device */ |
| 1088 | qsdev->rpdev.ops = &qcom_smd_device_ops; |
| 1089 | |
| 1090 | /* Assign public information to the rpmsg_device */ |
| 1091 | rpdev = &qsdev->rpdev; |
| 1092 | strncpy(rpdev->id.name, channel->name, RPMSG_NAME_SIZE); |
| 1093 | rpdev->src = RPMSG_ADDR_ANY; |
| 1094 | rpdev->dst = RPMSG_ADDR_ANY; |
| 1095 | |
| 1096 | rpdev->dev.of_node = qcom_smd_match_channel(edge->of_node, channel->name); |
| 1097 | rpdev->dev.parent = &edge->dev; |
Bjorn Andersson | b0b03b8 | 2017-03-15 22:18:35 -0700 | [diff] [blame] | 1098 | rpdev->dev.release = qcom_smd_release_device; |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1099 | |
| 1100 | return rpmsg_register_device(rpdev); |
| 1101 | } |
| 1102 | |
Bjorn Andersson | 0be363b | 2017-01-11 06:35:13 -0800 | [diff] [blame] | 1103 | static int qcom_smd_create_chrdev(struct qcom_smd_edge *edge) |
| 1104 | { |
| 1105 | struct qcom_smd_device *qsdev; |
| 1106 | |
| 1107 | qsdev = kzalloc(sizeof(*qsdev), GFP_KERNEL); |
| 1108 | if (!qsdev) |
| 1109 | return -ENOMEM; |
| 1110 | |
| 1111 | qsdev->edge = edge; |
| 1112 | qsdev->rpdev.ops = &qcom_smd_device_ops; |
| 1113 | qsdev->rpdev.dev.parent = &edge->dev; |
Bjorn Andersson | b0b03b8 | 2017-03-15 22:18:35 -0700 | [diff] [blame] | 1114 | qsdev->rpdev.dev.release = qcom_smd_release_device; |
| 1115 | |
Bjorn Andersson | 0be363b | 2017-01-11 06:35:13 -0800 | [diff] [blame] | 1116 | return rpmsg_chrdev_register_device(&qsdev->rpdev); |
| 1117 | } |
| 1118 | |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1119 | /* |
| 1120 | * Allocate the qcom_smd_channel object for a newly found smd channel, |
| 1121 | * retrieving and validating the smem items involved. |
| 1122 | */ |
| 1123 | static struct qcom_smd_channel *qcom_smd_create_channel(struct qcom_smd_edge *edge, |
| 1124 | unsigned smem_info_item, |
| 1125 | unsigned smem_fifo_item, |
| 1126 | char *name) |
| 1127 | { |
| 1128 | struct qcom_smd_channel *channel; |
| 1129 | size_t fifo_size; |
| 1130 | size_t info_size; |
| 1131 | void *fifo_base; |
| 1132 | void *info; |
| 1133 | int ret; |
| 1134 | |
Srinivas Kandagatla | 4a2e84c | 2018-06-04 10:39:01 +0100 | [diff] [blame] | 1135 | channel = kzalloc(sizeof(*channel), GFP_KERNEL); |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1136 | if (!channel) |
| 1137 | return ERR_PTR(-ENOMEM); |
| 1138 | |
| 1139 | channel->edge = edge; |
Srinivas Kandagatla | 4a2e84c | 2018-06-04 10:39:01 +0100 | [diff] [blame] | 1140 | channel->name = kstrdup(name, GFP_KERNEL); |
Colin Ian King | 940c620 | 2018-09-27 22:36:27 +0100 | [diff] [blame] | 1141 | if (!channel->name) { |
| 1142 | ret = -ENOMEM; |
| 1143 | goto free_channel; |
| 1144 | } |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1145 | |
Bjorn Andersson | 33e3820 | 2018-02-13 11:04:11 -0800 | [diff] [blame] | 1146 | spin_lock_init(&channel->tx_lock); |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1147 | spin_lock_init(&channel->recv_lock); |
| 1148 | init_waitqueue_head(&channel->fblockread_event); |
Bjorn Andersson | 268105f | 2017-12-12 15:58:53 -0800 | [diff] [blame] | 1149 | init_waitqueue_head(&channel->state_change_event); |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1150 | |
| 1151 | info = qcom_smem_get(edge->remote_pid, smem_info_item, &info_size); |
| 1152 | if (IS_ERR(info)) { |
| 1153 | ret = PTR_ERR(info); |
| 1154 | goto free_name_and_channel; |
| 1155 | } |
| 1156 | |
| 1157 | /* |
| 1158 | * Use the size of the item to figure out which channel info struct to |
| 1159 | * use. |
| 1160 | */ |
| 1161 | if (info_size == 2 * sizeof(struct smd_channel_info_word)) { |
| 1162 | channel->info_word = info; |
| 1163 | } else if (info_size == 2 * sizeof(struct smd_channel_info)) { |
| 1164 | channel->info = info; |
| 1165 | } else { |
| 1166 | dev_err(&edge->dev, |
| 1167 | "channel info of size %zu not supported\n", info_size); |
| 1168 | ret = -EINVAL; |
| 1169 | goto free_name_and_channel; |
| 1170 | } |
| 1171 | |
| 1172 | fifo_base = qcom_smem_get(edge->remote_pid, smem_fifo_item, &fifo_size); |
| 1173 | if (IS_ERR(fifo_base)) { |
| 1174 | ret = PTR_ERR(fifo_base); |
| 1175 | goto free_name_and_channel; |
| 1176 | } |
| 1177 | |
| 1178 | /* The channel consist of a rx and tx fifo of equal size */ |
| 1179 | fifo_size /= 2; |
| 1180 | |
| 1181 | dev_dbg(&edge->dev, "new channel '%s' info-size: %zu fifo-size: %zu\n", |
| 1182 | name, info_size, fifo_size); |
| 1183 | |
| 1184 | channel->tx_fifo = fifo_base; |
| 1185 | channel->rx_fifo = fifo_base + fifo_size; |
| 1186 | channel->fifo_size = fifo_size; |
| 1187 | |
| 1188 | qcom_smd_channel_reset(channel); |
| 1189 | |
| 1190 | return channel; |
| 1191 | |
| 1192 | free_name_and_channel: |
Srinivas Kandagatla | 4a2e84c | 2018-06-04 10:39:01 +0100 | [diff] [blame] | 1193 | kfree(channel->name); |
Colin Ian King | 940c620 | 2018-09-27 22:36:27 +0100 | [diff] [blame] | 1194 | free_channel: |
Srinivas Kandagatla | 4a2e84c | 2018-06-04 10:39:01 +0100 | [diff] [blame] | 1195 | kfree(channel); |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1196 | |
| 1197 | return ERR_PTR(ret); |
| 1198 | } |
| 1199 | |
| 1200 | /* |
| 1201 | * Scans the allocation table for any newly allocated channels, calls |
| 1202 | * qcom_smd_create_channel() to create representations of these and add |
| 1203 | * them to the edge's list of channels. |
| 1204 | */ |
| 1205 | static void qcom_channel_scan_worker(struct work_struct *work) |
| 1206 | { |
| 1207 | struct qcom_smd_edge *edge = container_of(work, struct qcom_smd_edge, scan_work); |
| 1208 | struct qcom_smd_alloc_entry *alloc_tbl; |
| 1209 | struct qcom_smd_alloc_entry *entry; |
| 1210 | struct qcom_smd_channel *channel; |
| 1211 | unsigned long flags; |
| 1212 | unsigned fifo_id; |
| 1213 | unsigned info_id; |
| 1214 | int tbl; |
| 1215 | int i; |
| 1216 | u32 eflags, cid; |
| 1217 | |
| 1218 | for (tbl = 0; tbl < SMD_ALLOC_TBL_COUNT; tbl++) { |
| 1219 | alloc_tbl = qcom_smem_get(edge->remote_pid, |
| 1220 | smem_items[tbl].alloc_tbl_id, NULL); |
| 1221 | if (IS_ERR(alloc_tbl)) |
| 1222 | continue; |
| 1223 | |
| 1224 | for (i = 0; i < SMD_ALLOC_TBL_SIZE; i++) { |
| 1225 | entry = &alloc_tbl[i]; |
| 1226 | eflags = le32_to_cpu(entry->flags); |
| 1227 | if (test_bit(i, edge->allocated[tbl])) |
| 1228 | continue; |
| 1229 | |
| 1230 | if (entry->ref_count == 0) |
| 1231 | continue; |
| 1232 | |
| 1233 | if (!entry->name[0]) |
| 1234 | continue; |
| 1235 | |
| 1236 | if (!(eflags & SMD_CHANNEL_FLAGS_PACKET)) |
| 1237 | continue; |
| 1238 | |
| 1239 | if ((eflags & SMD_CHANNEL_FLAGS_EDGE_MASK) != edge->edge_id) |
| 1240 | continue; |
| 1241 | |
| 1242 | cid = le32_to_cpu(entry->cid); |
| 1243 | info_id = smem_items[tbl].info_base_id + cid; |
| 1244 | fifo_id = smem_items[tbl].fifo_base_id + cid; |
| 1245 | |
| 1246 | channel = qcom_smd_create_channel(edge, info_id, fifo_id, entry->name); |
| 1247 | if (IS_ERR(channel)) |
| 1248 | continue; |
| 1249 | |
| 1250 | spin_lock_irqsave(&edge->channels_lock, flags); |
| 1251 | list_add(&channel->list, &edge->channels); |
| 1252 | spin_unlock_irqrestore(&edge->channels_lock, flags); |
| 1253 | |
| 1254 | dev_dbg(&edge->dev, "new channel found: '%s'\n", channel->name); |
| 1255 | set_bit(i, edge->allocated[tbl]); |
| 1256 | |
Bjorn Andersson | eb114f2 | 2017-12-12 15:58:55 -0800 | [diff] [blame] | 1257 | wake_up_interruptible_all(&edge->new_channel_event); |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1258 | } |
| 1259 | } |
| 1260 | |
| 1261 | schedule_work(&edge->state_work); |
| 1262 | } |
| 1263 | |
| 1264 | /* |
| 1265 | * This per edge worker scans smem for any new channels and register these. It |
| 1266 | * then scans all registered channels for state changes that should be handled |
| 1267 | * by creating or destroying smd client devices for the registered channels. |
| 1268 | * |
| 1269 | * LOCKING: edge->channels_lock only needs to cover the list operations, as the |
| 1270 | * worker is killed before any channels are deallocated |
| 1271 | */ |
| 1272 | static void qcom_channel_state_worker(struct work_struct *work) |
| 1273 | { |
| 1274 | struct qcom_smd_channel *channel; |
| 1275 | struct qcom_smd_edge *edge = container_of(work, |
| 1276 | struct qcom_smd_edge, |
| 1277 | state_work); |
| 1278 | struct rpmsg_channel_info chinfo; |
| 1279 | unsigned remote_state; |
| 1280 | unsigned long flags; |
| 1281 | |
| 1282 | /* |
| 1283 | * Register a device for any closed channel where the remote processor |
| 1284 | * is showing interest in opening the channel. |
| 1285 | */ |
| 1286 | spin_lock_irqsave(&edge->channels_lock, flags); |
| 1287 | list_for_each_entry(channel, &edge->channels, list) { |
| 1288 | if (channel->state != SMD_CHANNEL_CLOSED) |
| 1289 | continue; |
| 1290 | |
Bjorn Andersson | 2bd9b43 | 2018-03-15 11:12:44 -0700 | [diff] [blame] | 1291 | remote_state = GET_RX_CHANNEL_INFO(channel, state); |
| 1292 | if (remote_state != SMD_CHANNEL_OPENING && |
| 1293 | remote_state != SMD_CHANNEL_OPENED) |
| 1294 | continue; |
| 1295 | |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1296 | if (channel->registered) |
| 1297 | continue; |
| 1298 | |
| 1299 | spin_unlock_irqrestore(&edge->channels_lock, flags); |
| 1300 | qcom_smd_create_device(channel); |
| 1301 | channel->registered = true; |
| 1302 | spin_lock_irqsave(&edge->channels_lock, flags); |
| 1303 | |
| 1304 | channel->registered = true; |
| 1305 | } |
| 1306 | |
| 1307 | /* |
| 1308 | * Unregister the device for any channel that is opened where the |
| 1309 | * remote processor is closing the channel. |
| 1310 | */ |
| 1311 | list_for_each_entry(channel, &edge->channels, list) { |
| 1312 | if (channel->state != SMD_CHANNEL_OPENING && |
| 1313 | channel->state != SMD_CHANNEL_OPENED) |
| 1314 | continue; |
| 1315 | |
| 1316 | remote_state = GET_RX_CHANNEL_INFO(channel, state); |
| 1317 | if (remote_state == SMD_CHANNEL_OPENING || |
| 1318 | remote_state == SMD_CHANNEL_OPENED) |
| 1319 | continue; |
| 1320 | |
| 1321 | spin_unlock_irqrestore(&edge->channels_lock, flags); |
| 1322 | |
| 1323 | strncpy(chinfo.name, channel->name, sizeof(chinfo.name)); |
| 1324 | chinfo.src = RPMSG_ADDR_ANY; |
| 1325 | chinfo.dst = RPMSG_ADDR_ANY; |
| 1326 | rpmsg_unregister_device(&edge->dev, &chinfo); |
| 1327 | channel->registered = false; |
| 1328 | spin_lock_irqsave(&edge->channels_lock, flags); |
| 1329 | } |
| 1330 | spin_unlock_irqrestore(&edge->channels_lock, flags); |
| 1331 | } |
| 1332 | |
| 1333 | /* |
| 1334 | * Parses an of_node describing an edge. |
| 1335 | */ |
| 1336 | static int qcom_smd_parse_edge(struct device *dev, |
| 1337 | struct device_node *node, |
| 1338 | struct qcom_smd_edge *edge) |
| 1339 | { |
| 1340 | struct device_node *syscon_np; |
| 1341 | const char *key; |
| 1342 | int irq; |
| 1343 | int ret; |
| 1344 | |
| 1345 | INIT_LIST_HEAD(&edge->channels); |
| 1346 | spin_lock_init(&edge->channels_lock); |
| 1347 | |
| 1348 | INIT_WORK(&edge->scan_work, qcom_channel_scan_worker); |
| 1349 | INIT_WORK(&edge->state_work, qcom_channel_state_worker); |
| 1350 | |
| 1351 | edge->of_node = of_node_get(node); |
| 1352 | |
| 1353 | key = "qcom,smd-edge"; |
| 1354 | ret = of_property_read_u32(node, key, &edge->edge_id); |
| 1355 | if (ret) { |
| 1356 | dev_err(dev, "edge missing %s property\n", key); |
Dan Carpenter | e69ee0c | 2020-09-08 10:18:41 +0300 | [diff] [blame] | 1357 | goto put_node; |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1358 | } |
| 1359 | |
| 1360 | edge->remote_pid = QCOM_SMEM_HOST_ANY; |
| 1361 | key = "qcom,remote-pid"; |
| 1362 | of_property_read_u32(node, key, &edge->remote_pid); |
| 1363 | |
Bjorn Andersson | ab460a2 | 2018-04-19 18:17:57 -0700 | [diff] [blame] | 1364 | edge->mbox_client.dev = dev; |
| 1365 | edge->mbox_client.knows_txdone = true; |
| 1366 | edge->mbox_chan = mbox_request_channel(&edge->mbox_client, 0); |
| 1367 | if (IS_ERR(edge->mbox_chan)) { |
Dan Carpenter | e69ee0c | 2020-09-08 10:18:41 +0300 | [diff] [blame] | 1368 | if (PTR_ERR(edge->mbox_chan) != -ENODEV) { |
| 1369 | ret = PTR_ERR(edge->mbox_chan); |
| 1370 | goto put_node; |
| 1371 | } |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1372 | |
Bjorn Andersson | ab460a2 | 2018-04-19 18:17:57 -0700 | [diff] [blame] | 1373 | edge->mbox_chan = NULL; |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1374 | |
Bjorn Andersson | ab460a2 | 2018-04-19 18:17:57 -0700 | [diff] [blame] | 1375 | syscon_np = of_parse_phandle(node, "qcom,ipc", 0); |
| 1376 | if (!syscon_np) { |
| 1377 | dev_err(dev, "no qcom,ipc node\n"); |
Dan Carpenter | e69ee0c | 2020-09-08 10:18:41 +0300 | [diff] [blame] | 1378 | ret = -ENODEV; |
| 1379 | goto put_node; |
Bjorn Andersson | ab460a2 | 2018-04-19 18:17:57 -0700 | [diff] [blame] | 1380 | } |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1381 | |
Bjorn Andersson | ab460a2 | 2018-04-19 18:17:57 -0700 | [diff] [blame] | 1382 | edge->ipc_regmap = syscon_node_to_regmap(syscon_np); |
Dan Carpenter | e69ee0c | 2020-09-08 10:18:41 +0300 | [diff] [blame] | 1383 | if (IS_ERR(edge->ipc_regmap)) { |
| 1384 | ret = PTR_ERR(edge->ipc_regmap); |
| 1385 | goto put_node; |
| 1386 | } |
Bjorn Andersson | ab460a2 | 2018-04-19 18:17:57 -0700 | [diff] [blame] | 1387 | |
| 1388 | key = "qcom,ipc"; |
| 1389 | ret = of_property_read_u32_index(node, key, 1, &edge->ipc_offset); |
| 1390 | if (ret < 0) { |
| 1391 | dev_err(dev, "no offset in %s\n", key); |
Dan Carpenter | e69ee0c | 2020-09-08 10:18:41 +0300 | [diff] [blame] | 1392 | goto put_node; |
Bjorn Andersson | ab460a2 | 2018-04-19 18:17:57 -0700 | [diff] [blame] | 1393 | } |
| 1394 | |
| 1395 | ret = of_property_read_u32_index(node, key, 2, &edge->ipc_bit); |
| 1396 | if (ret < 0) { |
| 1397 | dev_err(dev, "no bit in %s\n", key); |
Dan Carpenter | e69ee0c | 2020-09-08 10:18:41 +0300 | [diff] [blame] | 1398 | goto put_node; |
Bjorn Andersson | ab460a2 | 2018-04-19 18:17:57 -0700 | [diff] [blame] | 1399 | } |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1400 | } |
| 1401 | |
Bjorn Andersson | 5e53c42 | 2016-12-02 14:06:02 -0800 | [diff] [blame] | 1402 | ret = of_property_read_string(node, "label", &edge->name); |
| 1403 | if (ret < 0) |
| 1404 | edge->name = node->name; |
| 1405 | |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1406 | irq = irq_of_parse_and_map(node, 0); |
| 1407 | if (irq < 0) { |
| 1408 | dev_err(dev, "required smd interrupt missing\n"); |
Dan Carpenter | e69ee0c | 2020-09-08 10:18:41 +0300 | [diff] [blame] | 1409 | ret = irq; |
| 1410 | goto put_node; |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1411 | } |
| 1412 | |
| 1413 | ret = devm_request_irq(dev, irq, |
| 1414 | qcom_smd_edge_intr, IRQF_TRIGGER_RISING, |
| 1415 | node->name, edge); |
| 1416 | if (ret) { |
| 1417 | dev_err(dev, "failed to request smd irq\n"); |
Dan Carpenter | e69ee0c | 2020-09-08 10:18:41 +0300 | [diff] [blame] | 1418 | goto put_node; |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1419 | } |
| 1420 | |
| 1421 | edge->irq = irq; |
| 1422 | |
| 1423 | return 0; |
Dan Carpenter | e69ee0c | 2020-09-08 10:18:41 +0300 | [diff] [blame] | 1424 | |
| 1425 | put_node: |
| 1426 | of_node_put(node); |
| 1427 | edge->of_node = NULL; |
| 1428 | |
| 1429 | return ret; |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1430 | } |
| 1431 | |
| 1432 | /* |
| 1433 | * Release function for an edge. |
| 1434 | * Reset the state of each associated channel and free the edge context. |
| 1435 | */ |
| 1436 | static void qcom_smd_edge_release(struct device *dev) |
| 1437 | { |
Srinivas Kandagatla | 4a2e84c | 2018-06-04 10:39:01 +0100 | [diff] [blame] | 1438 | struct qcom_smd_channel *channel, *tmp; |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1439 | struct qcom_smd_edge *edge = to_smd_edge(dev); |
| 1440 | |
Srinivas Kandagatla | 4a2e84c | 2018-06-04 10:39:01 +0100 | [diff] [blame] | 1441 | list_for_each_entry_safe(channel, tmp, &edge->channels, list) { |
| 1442 | list_del(&channel->list); |
| 1443 | kfree(channel->name); |
| 1444 | kfree(channel); |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1445 | } |
| 1446 | |
| 1447 | kfree(edge); |
| 1448 | } |
| 1449 | |
Bjorn Andersson | 5e53c42 | 2016-12-02 14:06:02 -0800 | [diff] [blame] | 1450 | static ssize_t rpmsg_name_show(struct device *dev, |
| 1451 | struct device_attribute *attr, char *buf) |
| 1452 | { |
| 1453 | struct qcom_smd_edge *edge = to_smd_edge(dev); |
| 1454 | |
| 1455 | return sprintf(buf, "%s\n", edge->name); |
| 1456 | } |
| 1457 | static DEVICE_ATTR_RO(rpmsg_name); |
| 1458 | |
| 1459 | static struct attribute *qcom_smd_edge_attrs[] = { |
| 1460 | &dev_attr_rpmsg_name.attr, |
| 1461 | NULL |
| 1462 | }; |
| 1463 | ATTRIBUTE_GROUPS(qcom_smd_edge); |
| 1464 | |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1465 | /** |
| 1466 | * qcom_smd_register_edge() - register an edge based on an device_node |
| 1467 | * @parent: parent device for the edge |
| 1468 | * @node: device_node describing the edge |
| 1469 | * |
| 1470 | * Returns an edge reference, or negative ERR_PTR() on failure. |
| 1471 | */ |
| 1472 | struct qcom_smd_edge *qcom_smd_register_edge(struct device *parent, |
| 1473 | struct device_node *node) |
| 1474 | { |
| 1475 | struct qcom_smd_edge *edge; |
| 1476 | int ret; |
| 1477 | |
| 1478 | edge = kzalloc(sizeof(*edge), GFP_KERNEL); |
| 1479 | if (!edge) |
| 1480 | return ERR_PTR(-ENOMEM); |
| 1481 | |
| 1482 | init_waitqueue_head(&edge->new_channel_event); |
| 1483 | |
| 1484 | edge->dev.parent = parent; |
| 1485 | edge->dev.release = qcom_smd_edge_release; |
Srinivas Kandagatla | aaafb24 | 2017-07-26 18:53:44 +0200 | [diff] [blame] | 1486 | edge->dev.of_node = node; |
Bjorn Andersson | 5e53c42 | 2016-12-02 14:06:02 -0800 | [diff] [blame] | 1487 | edge->dev.groups = qcom_smd_edge_groups; |
Rob Herring | c8a54c0 | 2018-08-27 20:52:43 -0500 | [diff] [blame] | 1488 | dev_set_name(&edge->dev, "%s:%pOFn", dev_name(parent), node); |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1489 | ret = device_register(&edge->dev); |
| 1490 | if (ret) { |
| 1491 | pr_err("failed to register smd edge\n"); |
Arvind Yadav | be5acd2 | 2018-03-08 15:06:08 +0530 | [diff] [blame] | 1492 | put_device(&edge->dev); |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1493 | return ERR_PTR(ret); |
| 1494 | } |
| 1495 | |
| 1496 | ret = qcom_smd_parse_edge(&edge->dev, node, edge); |
| 1497 | if (ret) { |
| 1498 | dev_err(&edge->dev, "failed to parse smd edge\n"); |
| 1499 | goto unregister_dev; |
| 1500 | } |
| 1501 | |
Bjorn Andersson | 0be363b | 2017-01-11 06:35:13 -0800 | [diff] [blame] | 1502 | ret = qcom_smd_create_chrdev(edge); |
| 1503 | if (ret) { |
| 1504 | dev_err(&edge->dev, "failed to register chrdev for edge\n"); |
| 1505 | goto unregister_dev; |
| 1506 | } |
| 1507 | |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1508 | schedule_work(&edge->scan_work); |
| 1509 | |
| 1510 | return edge; |
| 1511 | |
| 1512 | unregister_dev: |
Bjorn Andersson | ab460a2 | 2018-04-19 18:17:57 -0700 | [diff] [blame] | 1513 | if (!IS_ERR_OR_NULL(edge->mbox_chan)) |
| 1514 | mbox_free_channel(edge->mbox_chan); |
| 1515 | |
Arvind Yadav | be5acd2 | 2018-03-08 15:06:08 +0530 | [diff] [blame] | 1516 | device_unregister(&edge->dev); |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1517 | return ERR_PTR(ret); |
| 1518 | } |
| 1519 | EXPORT_SYMBOL(qcom_smd_register_edge); |
| 1520 | |
| 1521 | static int qcom_smd_remove_device(struct device *dev, void *data) |
| 1522 | { |
| 1523 | device_unregister(dev); |
| 1524 | |
| 1525 | return 0; |
| 1526 | } |
| 1527 | |
| 1528 | /** |
| 1529 | * qcom_smd_unregister_edge() - release an edge and its children |
| 1530 | * @edge: edge reference acquired from qcom_smd_register_edge |
| 1531 | */ |
| 1532 | int qcom_smd_unregister_edge(struct qcom_smd_edge *edge) |
| 1533 | { |
| 1534 | int ret; |
| 1535 | |
| 1536 | disable_irq(edge->irq); |
| 1537 | cancel_work_sync(&edge->scan_work); |
| 1538 | cancel_work_sync(&edge->state_work); |
| 1539 | |
| 1540 | ret = device_for_each_child(&edge->dev, NULL, qcom_smd_remove_device); |
| 1541 | if (ret) |
| 1542 | dev_warn(&edge->dev, "can't remove smd device: %d\n", ret); |
| 1543 | |
Bjorn Andersson | ab460a2 | 2018-04-19 18:17:57 -0700 | [diff] [blame] | 1544 | mbox_free_channel(edge->mbox_chan); |
Bjorn Andersson | 53e2822 | 2016-09-01 15:28:09 -0700 | [diff] [blame] | 1545 | device_unregister(&edge->dev); |
| 1546 | |
| 1547 | return 0; |
| 1548 | } |
| 1549 | EXPORT_SYMBOL(qcom_smd_unregister_edge); |
| 1550 | |
| 1551 | static int qcom_smd_probe(struct platform_device *pdev) |
| 1552 | { |
| 1553 | struct device_node *node; |
| 1554 | void *p; |
| 1555 | |
| 1556 | /* Wait for smem */ |
| 1557 | p = qcom_smem_get(QCOM_SMEM_HOST_ANY, smem_items[0].alloc_tbl_id, NULL); |
| 1558 | if (PTR_ERR(p) == -EPROBE_DEFER) |
| 1559 | return PTR_ERR(p); |
| 1560 | |
| 1561 | for_each_available_child_of_node(pdev->dev.of_node, node) |
| 1562 | qcom_smd_register_edge(&pdev->dev, node); |
| 1563 | |
| 1564 | return 0; |
| 1565 | } |
| 1566 | |
| 1567 | static int qcom_smd_remove_edge(struct device *dev, void *data) |
| 1568 | { |
| 1569 | struct qcom_smd_edge *edge = to_smd_edge(dev); |
| 1570 | |
| 1571 | return qcom_smd_unregister_edge(edge); |
| 1572 | } |
| 1573 | |
| 1574 | /* |
| 1575 | * Shut down all smd clients by making sure that each edge stops processing |
| 1576 | * events and scanning for new channels, then call destroy on the devices. |
| 1577 | */ |
| 1578 | static int qcom_smd_remove(struct platform_device *pdev) |
| 1579 | { |
| 1580 | int ret; |
| 1581 | |
| 1582 | ret = device_for_each_child(&pdev->dev, NULL, qcom_smd_remove_edge); |
| 1583 | if (ret) |
| 1584 | dev_warn(&pdev->dev, "can't remove smd device: %d\n", ret); |
| 1585 | |
| 1586 | return ret; |
| 1587 | } |
| 1588 | |
| 1589 | static const struct of_device_id qcom_smd_of_match[] = { |
| 1590 | { .compatible = "qcom,smd" }, |
| 1591 | {} |
| 1592 | }; |
| 1593 | MODULE_DEVICE_TABLE(of, qcom_smd_of_match); |
| 1594 | |
| 1595 | static struct platform_driver qcom_smd_driver = { |
| 1596 | .probe = qcom_smd_probe, |
| 1597 | .remove = qcom_smd_remove, |
| 1598 | .driver = { |
| 1599 | .name = "qcom-smd", |
| 1600 | .of_match_table = qcom_smd_of_match, |
| 1601 | }, |
| 1602 | }; |
| 1603 | |
| 1604 | static int __init qcom_smd_init(void) |
| 1605 | { |
| 1606 | return platform_driver_register(&qcom_smd_driver); |
| 1607 | } |
| 1608 | subsys_initcall(qcom_smd_init); |
| 1609 | |
| 1610 | static void __exit qcom_smd_exit(void) |
| 1611 | { |
| 1612 | platform_driver_unregister(&qcom_smd_driver); |
| 1613 | } |
| 1614 | module_exit(qcom_smd_exit); |
| 1615 | |
| 1616 | MODULE_AUTHOR("Bjorn Andersson <bjorn.andersson@sonymobile.com>"); |
| 1617 | MODULE_DESCRIPTION("Qualcomm Shared Memory Driver"); |
| 1618 | MODULE_LICENSE("GPL v2"); |