Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 1 | /* |
| 2 | * ssi_protocol.c |
| 3 | * |
| 4 | * Implementation of the SSI McSAAB improved protocol. |
| 5 | * |
| 6 | * Copyright (C) 2010 Nokia Corporation. All rights reserved. |
| 7 | * Copyright (C) 2013 Sebastian Reichel <sre@kernel.org> |
| 8 | * |
| 9 | * Contact: Carlos Chinea <carlos.chinea@nokia.com> |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or |
| 12 | * modify it under the terms of the GNU General Public License |
| 13 | * version 2 as published by the Free Software Foundation. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, but |
| 16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 18 | * General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, write to the Free Software |
| 22 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA |
| 23 | * 02110-1301 USA |
| 24 | */ |
| 25 | |
| 26 | #include <linux/atomic.h> |
| 27 | #include <linux/clk.h> |
| 28 | #include <linux/device.h> |
| 29 | #include <linux/err.h> |
| 30 | #include <linux/gpio.h> |
| 31 | #include <linux/if_ether.h> |
| 32 | #include <linux/if_arp.h> |
| 33 | #include <linux/if_phonet.h> |
| 34 | #include <linux/init.h> |
| 35 | #include <linux/irq.h> |
| 36 | #include <linux/list.h> |
| 37 | #include <linux/module.h> |
| 38 | #include <linux/netdevice.h> |
| 39 | #include <linux/notifier.h> |
| 40 | #include <linux/scatterlist.h> |
| 41 | #include <linux/skbuff.h> |
| 42 | #include <linux/slab.h> |
| 43 | #include <linux/spinlock.h> |
| 44 | #include <linux/timer.h> |
| 45 | #include <linux/hsi/hsi.h> |
| 46 | #include <linux/hsi/ssi_protocol.h> |
| 47 | |
| 48 | void ssi_waketest(struct hsi_client *cl, unsigned int enable); |
| 49 | |
| 50 | #define SSIP_TXQUEUE_LEN 100 |
| 51 | #define SSIP_MAX_MTU 65535 |
| 52 | #define SSIP_DEFAULT_MTU 4000 |
| 53 | #define PN_MEDIA_SOS 21 |
| 54 | #define SSIP_MIN_PN_HDR 6 /* FIXME: Revisit */ |
| 55 | #define SSIP_WDTOUT 2000 /* FIXME: has to be 500 msecs */ |
| 56 | #define SSIP_KATOUT 15 /* 15 msecs */ |
| 57 | #define SSIP_MAX_CMDS 5 /* Number of pre-allocated commands buffers */ |
| 58 | #define SSIP_BYTES_TO_FRAMES(x) ((((x) - 1) >> 2) + 1) |
| 59 | #define SSIP_CMT_LOADER_SYNC 0x11223344 |
| 60 | /* |
| 61 | * SSI protocol command definitions |
| 62 | */ |
| 63 | #define SSIP_COMMAND(data) ((data) >> 28) |
| 64 | #define SSIP_PAYLOAD(data) ((data) & 0xfffffff) |
| 65 | /* Commands */ |
| 66 | #define SSIP_SW_BREAK 0 |
| 67 | #define SSIP_BOOTINFO_REQ 1 |
| 68 | #define SSIP_BOOTINFO_RESP 2 |
| 69 | #define SSIP_WAKETEST_RESULT 3 |
| 70 | #define SSIP_START_TRANS 4 |
| 71 | #define SSIP_READY 5 |
| 72 | /* Payloads */ |
| 73 | #define SSIP_DATA_VERSION(data) ((data) & 0xff) |
| 74 | #define SSIP_LOCAL_VERID 1 |
| 75 | #define SSIP_WAKETEST_OK 0 |
| 76 | #define SSIP_WAKETEST_FAILED 1 |
| 77 | #define SSIP_PDU_LENGTH(data) (((data) >> 8) & 0xffff) |
| 78 | #define SSIP_MSG_ID(data) ((data) & 0xff) |
| 79 | /* Generic Command */ |
| 80 | #define SSIP_CMD(cmd, payload) (((cmd) << 28) | ((payload) & 0xfffffff)) |
| 81 | /* Commands for the control channel */ |
| 82 | #define SSIP_BOOTINFO_REQ_CMD(ver) \ |
| 83 | SSIP_CMD(SSIP_BOOTINFO_REQ, SSIP_DATA_VERSION(ver)) |
| 84 | #define SSIP_BOOTINFO_RESP_CMD(ver) \ |
| 85 | SSIP_CMD(SSIP_BOOTINFO_RESP, SSIP_DATA_VERSION(ver)) |
| 86 | #define SSIP_START_TRANS_CMD(pdulen, id) \ |
| 87 | SSIP_CMD(SSIP_START_TRANS, (((pdulen) << 8) | SSIP_MSG_ID(id))) |
| 88 | #define SSIP_READY_CMD SSIP_CMD(SSIP_READY, 0) |
| 89 | #define SSIP_SWBREAK_CMD SSIP_CMD(SSIP_SW_BREAK, 0) |
| 90 | |
Sebastian Reichel | 6d6c309 | 2016-06-18 00:55:22 +0200 | [diff] [blame] | 91 | #define SSIP_WAKETEST_FLAG 0 |
| 92 | |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 93 | /* Main state machine states */ |
| 94 | enum { |
| 95 | INIT, |
| 96 | HANDSHAKE, |
| 97 | ACTIVE, |
| 98 | }; |
| 99 | |
| 100 | /* Send state machine states */ |
| 101 | enum { |
| 102 | SEND_IDLE, |
| 103 | WAIT4READY, |
| 104 | SEND_READY, |
| 105 | SENDING, |
| 106 | SENDING_SWBREAK, |
| 107 | }; |
| 108 | |
| 109 | /* Receive state machine states */ |
| 110 | enum { |
| 111 | RECV_IDLE, |
| 112 | RECV_READY, |
| 113 | RECEIVING, |
| 114 | }; |
| 115 | |
| 116 | /** |
| 117 | * struct ssi_protocol - SSI protocol (McSAAB) data |
| 118 | * @main_state: Main state machine |
| 119 | * @send_state: TX state machine |
| 120 | * @recv_state: RX state machine |
Sebastian Reichel | 6d6c309 | 2016-06-18 00:55:22 +0200 | [diff] [blame] | 121 | * @flags: Flags, currently only used to follow wake line test |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 122 | * @rxid: RX data id |
| 123 | * @txid: TX data id |
| 124 | * @txqueue_len: TX queue length |
| 125 | * @tx_wd: TX watchdog |
| 126 | * @rx_wd: RX watchdog |
| 127 | * @keep_alive: Workaround for SSI HW bug |
| 128 | * @lock: To serialize access to this struct |
| 129 | * @netdev: Phonet network device |
| 130 | * @txqueue: TX data queue |
| 131 | * @cmdqueue: Queue of free commands |
| 132 | * @cl: HSI client own reference |
| 133 | * @link: Link for ssip_list |
| 134 | * @tx_usecount: Refcount to keep track the slaves that use the wake line |
| 135 | * @channel_id_cmd: HSI channel id for command stream |
| 136 | * @channel_id_data: HSI channel id for data stream |
| 137 | */ |
| 138 | struct ssi_protocol { |
| 139 | unsigned int main_state; |
| 140 | unsigned int send_state; |
| 141 | unsigned int recv_state; |
Sebastian Reichel | 6d6c309 | 2016-06-18 00:55:22 +0200 | [diff] [blame] | 142 | unsigned long flags; |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 143 | u8 rxid; |
| 144 | u8 txid; |
| 145 | unsigned int txqueue_len; |
| 146 | struct timer_list tx_wd; |
| 147 | struct timer_list rx_wd; |
| 148 | struct timer_list keep_alive; /* wake-up workaround */ |
| 149 | spinlock_t lock; |
| 150 | struct net_device *netdev; |
| 151 | struct list_head txqueue; |
| 152 | struct list_head cmdqueue; |
Sebastian Reichel | df26d63 | 2016-06-18 00:58:39 +0200 | [diff] [blame] | 153 | struct work_struct work; |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 154 | struct hsi_client *cl; |
| 155 | struct list_head link; |
| 156 | atomic_t tx_usecnt; |
| 157 | int channel_id_cmd; |
| 158 | int channel_id_data; |
| 159 | }; |
| 160 | |
| 161 | /* List of ssi protocol instances */ |
| 162 | static LIST_HEAD(ssip_list); |
| 163 | |
| 164 | static void ssip_rxcmd_complete(struct hsi_msg *msg); |
| 165 | |
| 166 | static inline void ssip_set_cmd(struct hsi_msg *msg, u32 cmd) |
| 167 | { |
| 168 | u32 *data; |
| 169 | |
| 170 | data = sg_virt(msg->sgt.sgl); |
| 171 | *data = cmd; |
| 172 | } |
| 173 | |
| 174 | static inline u32 ssip_get_cmd(struct hsi_msg *msg) |
| 175 | { |
| 176 | u32 *data; |
| 177 | |
| 178 | data = sg_virt(msg->sgt.sgl); |
| 179 | |
| 180 | return *data; |
| 181 | } |
| 182 | |
| 183 | static void ssip_skb_to_msg(struct sk_buff *skb, struct hsi_msg *msg) |
| 184 | { |
| 185 | skb_frag_t *frag; |
| 186 | struct scatterlist *sg; |
| 187 | int i; |
| 188 | |
| 189 | BUG_ON(msg->sgt.nents != (unsigned int)(skb_shinfo(skb)->nr_frags + 1)); |
| 190 | |
| 191 | sg = msg->sgt.sgl; |
| 192 | sg_set_buf(sg, skb->data, skb_headlen(skb)); |
| 193 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
| 194 | sg = sg_next(sg); |
| 195 | BUG_ON(!sg); |
| 196 | frag = &skb_shinfo(skb)->frags[i]; |
| 197 | sg_set_page(sg, frag->page.p, frag->size, frag->page_offset); |
| 198 | } |
| 199 | } |
| 200 | |
| 201 | static void ssip_free_data(struct hsi_msg *msg) |
| 202 | { |
| 203 | struct sk_buff *skb; |
| 204 | |
| 205 | skb = msg->context; |
| 206 | pr_debug("free data: msg %p context %p skb %p\n", msg, msg->context, |
| 207 | skb); |
| 208 | msg->destructor = NULL; |
| 209 | dev_kfree_skb(skb); |
| 210 | hsi_free_msg(msg); |
| 211 | } |
| 212 | |
| 213 | static struct hsi_msg *ssip_alloc_data(struct ssi_protocol *ssi, |
| 214 | struct sk_buff *skb, gfp_t flags) |
| 215 | { |
| 216 | struct hsi_msg *msg; |
| 217 | |
| 218 | msg = hsi_alloc_msg(skb_shinfo(skb)->nr_frags + 1, flags); |
| 219 | if (!msg) |
| 220 | return NULL; |
| 221 | ssip_skb_to_msg(skb, msg); |
| 222 | msg->destructor = ssip_free_data; |
| 223 | msg->channel = ssi->channel_id_data; |
| 224 | msg->context = skb; |
| 225 | |
| 226 | return msg; |
| 227 | } |
| 228 | |
| 229 | static inline void ssip_release_cmd(struct hsi_msg *msg) |
| 230 | { |
| 231 | struct ssi_protocol *ssi = hsi_client_drvdata(msg->cl); |
| 232 | |
| 233 | dev_dbg(&msg->cl->device, "Release cmd 0x%08x\n", ssip_get_cmd(msg)); |
| 234 | spin_lock_bh(&ssi->lock); |
| 235 | list_add_tail(&msg->link, &ssi->cmdqueue); |
| 236 | spin_unlock_bh(&ssi->lock); |
| 237 | } |
| 238 | |
| 239 | static struct hsi_msg *ssip_claim_cmd(struct ssi_protocol *ssi) |
| 240 | { |
| 241 | struct hsi_msg *msg; |
| 242 | |
| 243 | BUG_ON(list_empty(&ssi->cmdqueue)); |
| 244 | |
| 245 | spin_lock_bh(&ssi->lock); |
| 246 | msg = list_first_entry(&ssi->cmdqueue, struct hsi_msg, link); |
| 247 | list_del(&msg->link); |
| 248 | spin_unlock_bh(&ssi->lock); |
| 249 | msg->destructor = ssip_release_cmd; |
| 250 | |
| 251 | return msg; |
| 252 | } |
| 253 | |
| 254 | static void ssip_free_cmds(struct ssi_protocol *ssi) |
| 255 | { |
| 256 | struct hsi_msg *msg, *tmp; |
| 257 | |
| 258 | list_for_each_entry_safe(msg, tmp, &ssi->cmdqueue, link) { |
| 259 | list_del(&msg->link); |
| 260 | msg->destructor = NULL; |
| 261 | kfree(sg_virt(msg->sgt.sgl)); |
| 262 | hsi_free_msg(msg); |
| 263 | } |
| 264 | } |
| 265 | |
| 266 | static int ssip_alloc_cmds(struct ssi_protocol *ssi) |
| 267 | { |
| 268 | struct hsi_msg *msg; |
| 269 | u32 *buf; |
| 270 | unsigned int i; |
| 271 | |
| 272 | for (i = 0; i < SSIP_MAX_CMDS; i++) { |
| 273 | msg = hsi_alloc_msg(1, GFP_KERNEL); |
| 274 | if (!msg) |
| 275 | goto out; |
| 276 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); |
| 277 | if (!buf) { |
| 278 | hsi_free_msg(msg); |
| 279 | goto out; |
| 280 | } |
| 281 | sg_init_one(msg->sgt.sgl, buf, sizeof(*buf)); |
| 282 | msg->channel = ssi->channel_id_cmd; |
| 283 | list_add_tail(&msg->link, &ssi->cmdqueue); |
| 284 | } |
| 285 | |
| 286 | return 0; |
| 287 | out: |
| 288 | ssip_free_cmds(ssi); |
| 289 | |
| 290 | return -ENOMEM; |
| 291 | } |
| 292 | |
| 293 | static void ssip_set_rxstate(struct ssi_protocol *ssi, unsigned int state) |
| 294 | { |
| 295 | ssi->recv_state = state; |
| 296 | switch (state) { |
| 297 | case RECV_IDLE: |
| 298 | del_timer(&ssi->rx_wd); |
| 299 | if (ssi->send_state == SEND_IDLE) |
| 300 | del_timer(&ssi->keep_alive); |
| 301 | break; |
| 302 | case RECV_READY: |
| 303 | /* CMT speech workaround */ |
| 304 | if (atomic_read(&ssi->tx_usecnt)) |
| 305 | break; |
| 306 | /* Otherwise fall through */ |
| 307 | case RECEIVING: |
| 308 | mod_timer(&ssi->keep_alive, jiffies + |
| 309 | msecs_to_jiffies(SSIP_KATOUT)); |
| 310 | mod_timer(&ssi->rx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT)); |
| 311 | break; |
| 312 | default: |
| 313 | break; |
| 314 | } |
| 315 | } |
| 316 | |
| 317 | static void ssip_set_txstate(struct ssi_protocol *ssi, unsigned int state) |
| 318 | { |
| 319 | ssi->send_state = state; |
| 320 | switch (state) { |
| 321 | case SEND_IDLE: |
| 322 | case SEND_READY: |
| 323 | del_timer(&ssi->tx_wd); |
| 324 | if (ssi->recv_state == RECV_IDLE) |
| 325 | del_timer(&ssi->keep_alive); |
| 326 | break; |
| 327 | case WAIT4READY: |
| 328 | case SENDING: |
| 329 | case SENDING_SWBREAK: |
| 330 | mod_timer(&ssi->keep_alive, |
| 331 | jiffies + msecs_to_jiffies(SSIP_KATOUT)); |
| 332 | mod_timer(&ssi->tx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT)); |
| 333 | break; |
| 334 | default: |
| 335 | break; |
| 336 | } |
| 337 | } |
| 338 | |
| 339 | struct hsi_client *ssip_slave_get_master(struct hsi_client *slave) |
| 340 | { |
| 341 | struct hsi_client *master = ERR_PTR(-ENODEV); |
| 342 | struct ssi_protocol *ssi; |
| 343 | |
| 344 | list_for_each_entry(ssi, &ssip_list, link) |
| 345 | if (slave->device.parent == ssi->cl->device.parent) { |
| 346 | master = ssi->cl; |
| 347 | break; |
| 348 | } |
| 349 | |
| 350 | return master; |
| 351 | } |
| 352 | EXPORT_SYMBOL_GPL(ssip_slave_get_master); |
| 353 | |
| 354 | int ssip_slave_start_tx(struct hsi_client *master) |
| 355 | { |
| 356 | struct ssi_protocol *ssi = hsi_client_drvdata(master); |
| 357 | |
| 358 | dev_dbg(&master->device, "start TX %d\n", atomic_read(&ssi->tx_usecnt)); |
| 359 | spin_lock_bh(&ssi->lock); |
| 360 | if (ssi->send_state == SEND_IDLE) { |
| 361 | ssip_set_txstate(ssi, WAIT4READY); |
| 362 | hsi_start_tx(master); |
| 363 | } |
| 364 | spin_unlock_bh(&ssi->lock); |
| 365 | atomic_inc(&ssi->tx_usecnt); |
| 366 | |
| 367 | return 0; |
| 368 | } |
| 369 | EXPORT_SYMBOL_GPL(ssip_slave_start_tx); |
| 370 | |
| 371 | int ssip_slave_stop_tx(struct hsi_client *master) |
| 372 | { |
| 373 | struct ssi_protocol *ssi = hsi_client_drvdata(master); |
| 374 | |
| 375 | WARN_ON_ONCE(atomic_read(&ssi->tx_usecnt) == 0); |
| 376 | |
| 377 | if (atomic_dec_and_test(&ssi->tx_usecnt)) { |
| 378 | spin_lock_bh(&ssi->lock); |
| 379 | if ((ssi->send_state == SEND_READY) || |
| 380 | (ssi->send_state == WAIT4READY)) { |
| 381 | ssip_set_txstate(ssi, SEND_IDLE); |
| 382 | hsi_stop_tx(master); |
| 383 | } |
| 384 | spin_unlock_bh(&ssi->lock); |
| 385 | } |
| 386 | dev_dbg(&master->device, "stop TX %d\n", atomic_read(&ssi->tx_usecnt)); |
| 387 | |
| 388 | return 0; |
| 389 | } |
| 390 | EXPORT_SYMBOL_GPL(ssip_slave_stop_tx); |
| 391 | |
| 392 | int ssip_slave_running(struct hsi_client *master) |
| 393 | { |
| 394 | struct ssi_protocol *ssi = hsi_client_drvdata(master); |
| 395 | return netif_running(ssi->netdev); |
| 396 | } |
| 397 | EXPORT_SYMBOL_GPL(ssip_slave_running); |
| 398 | |
| 399 | static void ssip_reset(struct hsi_client *cl) |
| 400 | { |
| 401 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); |
| 402 | struct list_head *head, *tmp; |
| 403 | struct hsi_msg *msg; |
| 404 | |
| 405 | if (netif_running(ssi->netdev)) |
| 406 | netif_carrier_off(ssi->netdev); |
| 407 | hsi_flush(cl); |
| 408 | spin_lock_bh(&ssi->lock); |
| 409 | if (ssi->send_state != SEND_IDLE) |
| 410 | hsi_stop_tx(cl); |
Sebastian Reichel | 6d6c309 | 2016-06-18 00:55:22 +0200 | [diff] [blame] | 411 | spin_unlock_bh(&ssi->lock); |
| 412 | if (test_and_clear_bit(SSIP_WAKETEST_FLAG, &ssi->flags)) |
| 413 | ssi_waketest(cl, 0); /* FIXME: To be removed */ |
| 414 | spin_lock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 415 | del_timer(&ssi->rx_wd); |
| 416 | del_timer(&ssi->tx_wd); |
| 417 | del_timer(&ssi->keep_alive); |
| 418 | ssi->main_state = 0; |
| 419 | ssi->send_state = 0; |
| 420 | ssi->recv_state = 0; |
Sebastian Reichel | 6d6c309 | 2016-06-18 00:55:22 +0200 | [diff] [blame] | 421 | ssi->flags = 0; |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 422 | ssi->rxid = 0; |
| 423 | ssi->txid = 0; |
| 424 | list_for_each_safe(head, tmp, &ssi->txqueue) { |
| 425 | msg = list_entry(head, struct hsi_msg, link); |
| 426 | dev_dbg(&cl->device, "Pending TX data\n"); |
| 427 | list_del(head); |
| 428 | ssip_free_data(msg); |
| 429 | } |
| 430 | ssi->txqueue_len = 0; |
| 431 | spin_unlock_bh(&ssi->lock); |
| 432 | } |
| 433 | |
| 434 | static void ssip_dump_state(struct hsi_client *cl) |
| 435 | { |
| 436 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); |
| 437 | struct hsi_msg *msg; |
| 438 | |
| 439 | spin_lock_bh(&ssi->lock); |
| 440 | dev_err(&cl->device, "Main state: %d\n", ssi->main_state); |
| 441 | dev_err(&cl->device, "Recv state: %d\n", ssi->recv_state); |
| 442 | dev_err(&cl->device, "Send state: %d\n", ssi->send_state); |
| 443 | dev_err(&cl->device, "CMT %s\n", (ssi->main_state == ACTIVE) ? |
| 444 | "Online" : "Offline"); |
Sebastian Reichel | 6d6c309 | 2016-06-18 00:55:22 +0200 | [diff] [blame] | 445 | dev_err(&cl->device, "Wake test %d\n", |
| 446 | test_bit(SSIP_WAKETEST_FLAG, &ssi->flags)); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 447 | dev_err(&cl->device, "Data RX id: %d\n", ssi->rxid); |
| 448 | dev_err(&cl->device, "Data TX id: %d\n", ssi->txid); |
| 449 | |
| 450 | list_for_each_entry(msg, &ssi->txqueue, link) |
| 451 | dev_err(&cl->device, "pending TX data (%p)\n", msg); |
| 452 | spin_unlock_bh(&ssi->lock); |
| 453 | } |
| 454 | |
| 455 | static void ssip_error(struct hsi_client *cl) |
| 456 | { |
| 457 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); |
| 458 | struct hsi_msg *msg; |
| 459 | |
| 460 | ssip_dump_state(cl); |
| 461 | ssip_reset(cl); |
| 462 | msg = ssip_claim_cmd(ssi); |
| 463 | msg->complete = ssip_rxcmd_complete; |
| 464 | hsi_async_read(cl, msg); |
| 465 | } |
| 466 | |
| 467 | static void ssip_keep_alive(unsigned long data) |
| 468 | { |
| 469 | struct hsi_client *cl = (struct hsi_client *)data; |
| 470 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); |
| 471 | |
| 472 | dev_dbg(&cl->device, "Keep alive kick in: m(%d) r(%d) s(%d)\n", |
| 473 | ssi->main_state, ssi->recv_state, ssi->send_state); |
| 474 | |
| 475 | spin_lock(&ssi->lock); |
| 476 | if (ssi->recv_state == RECV_IDLE) |
| 477 | switch (ssi->send_state) { |
| 478 | case SEND_READY: |
| 479 | if (atomic_read(&ssi->tx_usecnt) == 0) |
| 480 | break; |
| 481 | /* |
| 482 | * Fall through. Workaround for cmt-speech |
| 483 | * in that case we relay on audio timers. |
| 484 | */ |
| 485 | case SEND_IDLE: |
| 486 | spin_unlock(&ssi->lock); |
| 487 | return; |
| 488 | } |
| 489 | mod_timer(&ssi->keep_alive, jiffies + msecs_to_jiffies(SSIP_KATOUT)); |
| 490 | spin_unlock(&ssi->lock); |
| 491 | } |
| 492 | |
| 493 | static void ssip_wd(unsigned long data) |
| 494 | { |
| 495 | struct hsi_client *cl = (struct hsi_client *)data; |
| 496 | |
| 497 | dev_err(&cl->device, "Watchdog trigerred\n"); |
| 498 | ssip_error(cl); |
| 499 | } |
| 500 | |
| 501 | static void ssip_send_bootinfo_req_cmd(struct hsi_client *cl) |
| 502 | { |
| 503 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); |
| 504 | struct hsi_msg *msg; |
| 505 | |
| 506 | dev_dbg(&cl->device, "Issuing BOOT INFO REQ command\n"); |
| 507 | msg = ssip_claim_cmd(ssi); |
| 508 | ssip_set_cmd(msg, SSIP_BOOTINFO_REQ_CMD(SSIP_LOCAL_VERID)); |
| 509 | msg->complete = ssip_release_cmd; |
| 510 | hsi_async_write(cl, msg); |
| 511 | dev_dbg(&cl->device, "Issuing RX command\n"); |
| 512 | msg = ssip_claim_cmd(ssi); |
| 513 | msg->complete = ssip_rxcmd_complete; |
| 514 | hsi_async_read(cl, msg); |
| 515 | } |
| 516 | |
| 517 | static void ssip_start_rx(struct hsi_client *cl) |
| 518 | { |
| 519 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); |
| 520 | struct hsi_msg *msg; |
| 521 | |
| 522 | dev_dbg(&cl->device, "RX start M(%d) R(%d)\n", ssi->main_state, |
| 523 | ssi->recv_state); |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 524 | spin_lock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 525 | /* |
| 526 | * We can have two UP events in a row due to a short low |
| 527 | * high transition. Therefore we need to ignore the sencond UP event. |
| 528 | */ |
| 529 | if ((ssi->main_state != ACTIVE) || (ssi->recv_state == RECV_READY)) { |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 530 | spin_unlock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 531 | return; |
| 532 | } |
| 533 | ssip_set_rxstate(ssi, RECV_READY); |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 534 | spin_unlock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 535 | |
| 536 | msg = ssip_claim_cmd(ssi); |
| 537 | ssip_set_cmd(msg, SSIP_READY_CMD); |
| 538 | msg->complete = ssip_release_cmd; |
| 539 | dev_dbg(&cl->device, "Send READY\n"); |
| 540 | hsi_async_write(cl, msg); |
| 541 | } |
| 542 | |
| 543 | static void ssip_stop_rx(struct hsi_client *cl) |
| 544 | { |
| 545 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); |
| 546 | |
| 547 | dev_dbg(&cl->device, "RX stop M(%d)\n", ssi->main_state); |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 548 | spin_lock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 549 | if (likely(ssi->main_state == ACTIVE)) |
| 550 | ssip_set_rxstate(ssi, RECV_IDLE); |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 551 | spin_unlock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 552 | } |
| 553 | |
| 554 | static void ssip_free_strans(struct hsi_msg *msg) |
| 555 | { |
| 556 | ssip_free_data(msg->context); |
| 557 | ssip_release_cmd(msg); |
| 558 | } |
| 559 | |
| 560 | static void ssip_strans_complete(struct hsi_msg *msg) |
| 561 | { |
| 562 | struct hsi_client *cl = msg->cl; |
| 563 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); |
| 564 | struct hsi_msg *data; |
| 565 | |
| 566 | data = msg->context; |
| 567 | ssip_release_cmd(msg); |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 568 | spin_lock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 569 | ssip_set_txstate(ssi, SENDING); |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 570 | spin_unlock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 571 | hsi_async_write(cl, data); |
| 572 | } |
| 573 | |
| 574 | static int ssip_xmit(struct hsi_client *cl) |
| 575 | { |
| 576 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); |
| 577 | struct hsi_msg *msg, *dmsg; |
| 578 | struct sk_buff *skb; |
| 579 | |
| 580 | spin_lock_bh(&ssi->lock); |
| 581 | if (list_empty(&ssi->txqueue)) { |
| 582 | spin_unlock_bh(&ssi->lock); |
| 583 | return 0; |
| 584 | } |
| 585 | dmsg = list_first_entry(&ssi->txqueue, struct hsi_msg, link); |
| 586 | list_del(&dmsg->link); |
| 587 | ssi->txqueue_len--; |
| 588 | spin_unlock_bh(&ssi->lock); |
| 589 | |
| 590 | msg = ssip_claim_cmd(ssi); |
| 591 | skb = dmsg->context; |
| 592 | msg->context = dmsg; |
| 593 | msg->complete = ssip_strans_complete; |
| 594 | msg->destructor = ssip_free_strans; |
| 595 | |
| 596 | spin_lock_bh(&ssi->lock); |
| 597 | ssip_set_cmd(msg, SSIP_START_TRANS_CMD(SSIP_BYTES_TO_FRAMES(skb->len), |
| 598 | ssi->txid)); |
| 599 | ssi->txid++; |
| 600 | ssip_set_txstate(ssi, SENDING); |
| 601 | spin_unlock_bh(&ssi->lock); |
| 602 | |
| 603 | dev_dbg(&cl->device, "Send STRANS (%d frames)\n", |
| 604 | SSIP_BYTES_TO_FRAMES(skb->len)); |
| 605 | |
| 606 | return hsi_async_write(cl, msg); |
| 607 | } |
| 608 | |
| 609 | /* In soft IRQ context */ |
| 610 | static void ssip_pn_rx(struct sk_buff *skb) |
| 611 | { |
| 612 | struct net_device *dev = skb->dev; |
| 613 | |
| 614 | if (unlikely(!netif_running(dev))) { |
| 615 | dev_dbg(&dev->dev, "Drop RX packet\n"); |
| 616 | dev->stats.rx_dropped++; |
| 617 | dev_kfree_skb(skb); |
| 618 | return; |
| 619 | } |
| 620 | if (unlikely(!pskb_may_pull(skb, SSIP_MIN_PN_HDR))) { |
| 621 | dev_dbg(&dev->dev, "Error drop RX packet\n"); |
| 622 | dev->stats.rx_errors++; |
| 623 | dev->stats.rx_length_errors++; |
| 624 | dev_kfree_skb(skb); |
| 625 | return; |
| 626 | } |
| 627 | dev->stats.rx_packets++; |
| 628 | dev->stats.rx_bytes += skb->len; |
| 629 | |
| 630 | /* length field is exchanged in network byte order */ |
| 631 | ((u16 *)skb->data)[2] = ntohs(((u16 *)skb->data)[2]); |
| 632 | dev_dbg(&dev->dev, "RX length fixed (%04x -> %u)\n", |
| 633 | ((u16 *)skb->data)[2], ntohs(((u16 *)skb->data)[2])); |
| 634 | |
| 635 | skb->protocol = htons(ETH_P_PHONET); |
| 636 | skb_reset_mac_header(skb); |
| 637 | __skb_pull(skb, 1); |
| 638 | netif_rx(skb); |
| 639 | } |
| 640 | |
| 641 | static void ssip_rx_data_complete(struct hsi_msg *msg) |
| 642 | { |
| 643 | struct hsi_client *cl = msg->cl; |
| 644 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); |
| 645 | struct sk_buff *skb; |
| 646 | |
| 647 | if (msg->status == HSI_STATUS_ERROR) { |
| 648 | dev_err(&cl->device, "RX data error\n"); |
| 649 | ssip_free_data(msg); |
| 650 | ssip_error(cl); |
| 651 | return; |
| 652 | } |
| 653 | del_timer(&ssi->rx_wd); /* FIXME: Revisit */ |
| 654 | skb = msg->context; |
| 655 | ssip_pn_rx(skb); |
| 656 | hsi_free_msg(msg); |
| 657 | } |
| 658 | |
| 659 | static void ssip_rx_bootinforeq(struct hsi_client *cl, u32 cmd) |
| 660 | { |
| 661 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); |
| 662 | struct hsi_msg *msg; |
| 663 | |
| 664 | /* Workaroud: Ignore CMT Loader message leftover */ |
| 665 | if (cmd == SSIP_CMT_LOADER_SYNC) |
| 666 | return; |
| 667 | |
| 668 | switch (ssi->main_state) { |
| 669 | case ACTIVE: |
| 670 | dev_err(&cl->device, "Boot info req on active state\n"); |
| 671 | ssip_error(cl); |
| 672 | /* Fall through */ |
| 673 | case INIT: |
Sebastian Reichel | 87d9906 | 2016-01-17 16:49:08 +0100 | [diff] [blame] | 674 | case HANDSHAKE: |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 675 | spin_lock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 676 | ssi->main_state = HANDSHAKE; |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 677 | spin_unlock_bh(&ssi->lock); |
Sebastian Reichel | 6d6c309 | 2016-06-18 00:55:22 +0200 | [diff] [blame] | 678 | |
| 679 | if (!test_and_set_bit(SSIP_WAKETEST_FLAG, &ssi->flags)) |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 680 | ssi_waketest(cl, 1); /* FIXME: To be removed */ |
Sebastian Reichel | 6d6c309 | 2016-06-18 00:55:22 +0200 | [diff] [blame] | 681 | |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 682 | spin_lock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 683 | /* Start boot handshake watchdog */ |
| 684 | mod_timer(&ssi->tx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT)); |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 685 | spin_unlock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 686 | dev_dbg(&cl->device, "Send BOOTINFO_RESP\n"); |
| 687 | if (SSIP_DATA_VERSION(cmd) != SSIP_LOCAL_VERID) |
| 688 | dev_warn(&cl->device, "boot info req verid mismatch\n"); |
| 689 | msg = ssip_claim_cmd(ssi); |
| 690 | ssip_set_cmd(msg, SSIP_BOOTINFO_RESP_CMD(SSIP_LOCAL_VERID)); |
| 691 | msg->complete = ssip_release_cmd; |
| 692 | hsi_async_write(cl, msg); |
| 693 | break; |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 694 | default: |
| 695 | dev_dbg(&cl->device, "Wrong state M(%d)\n", ssi->main_state); |
| 696 | break; |
| 697 | } |
| 698 | } |
| 699 | |
| 700 | static void ssip_rx_bootinforesp(struct hsi_client *cl, u32 cmd) |
| 701 | { |
| 702 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); |
| 703 | |
| 704 | if (SSIP_DATA_VERSION(cmd) != SSIP_LOCAL_VERID) |
| 705 | dev_warn(&cl->device, "boot info resp verid mismatch\n"); |
| 706 | |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 707 | spin_lock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 708 | if (ssi->main_state != ACTIVE) |
| 709 | /* Use tx_wd as a boot watchdog in non ACTIVE state */ |
| 710 | mod_timer(&ssi->tx_wd, jiffies + msecs_to_jiffies(SSIP_WDTOUT)); |
| 711 | else |
| 712 | dev_dbg(&cl->device, "boot info resp ignored M(%d)\n", |
| 713 | ssi->main_state); |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 714 | spin_unlock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 715 | } |
| 716 | |
| 717 | static void ssip_rx_waketest(struct hsi_client *cl, u32 cmd) |
| 718 | { |
| 719 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); |
| 720 | unsigned int wkres = SSIP_PAYLOAD(cmd); |
| 721 | |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 722 | spin_lock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 723 | if (ssi->main_state != HANDSHAKE) { |
| 724 | dev_dbg(&cl->device, "wake lines test ignored M(%d)\n", |
| 725 | ssi->main_state); |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 726 | spin_unlock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 727 | return; |
| 728 | } |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 729 | spin_unlock_bh(&ssi->lock); |
Sebastian Reichel | 6d6c309 | 2016-06-18 00:55:22 +0200 | [diff] [blame] | 730 | |
| 731 | if (test_and_clear_bit(SSIP_WAKETEST_FLAG, &ssi->flags)) |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 732 | ssi_waketest(cl, 0); /* FIXME: To be removed */ |
Sebastian Reichel | 6d6c309 | 2016-06-18 00:55:22 +0200 | [diff] [blame] | 733 | |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 734 | spin_lock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 735 | ssi->main_state = ACTIVE; |
| 736 | del_timer(&ssi->tx_wd); /* Stop boot handshake timer */ |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 737 | spin_unlock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 738 | |
| 739 | dev_notice(&cl->device, "WAKELINES TEST %s\n", |
| 740 | wkres & SSIP_WAKETEST_FAILED ? "FAILED" : "OK"); |
| 741 | if (wkres & SSIP_WAKETEST_FAILED) { |
| 742 | ssip_error(cl); |
| 743 | return; |
| 744 | } |
| 745 | dev_dbg(&cl->device, "CMT is ONLINE\n"); |
| 746 | netif_wake_queue(ssi->netdev); |
| 747 | netif_carrier_on(ssi->netdev); |
| 748 | } |
| 749 | |
| 750 | static void ssip_rx_ready(struct hsi_client *cl) |
| 751 | { |
| 752 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); |
| 753 | |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 754 | spin_lock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 755 | if (unlikely(ssi->main_state != ACTIVE)) { |
| 756 | dev_dbg(&cl->device, "READY on wrong state: S(%d) M(%d)\n", |
| 757 | ssi->send_state, ssi->main_state); |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 758 | spin_unlock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 759 | return; |
| 760 | } |
| 761 | if (ssi->send_state != WAIT4READY) { |
| 762 | dev_dbg(&cl->device, "Ignore spurious READY command\n"); |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 763 | spin_unlock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 764 | return; |
| 765 | } |
| 766 | ssip_set_txstate(ssi, SEND_READY); |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 767 | spin_unlock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 768 | ssip_xmit(cl); |
| 769 | } |
| 770 | |
| 771 | static void ssip_rx_strans(struct hsi_client *cl, u32 cmd) |
| 772 | { |
| 773 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); |
| 774 | struct sk_buff *skb; |
| 775 | struct hsi_msg *msg; |
| 776 | int len = SSIP_PDU_LENGTH(cmd); |
| 777 | |
| 778 | dev_dbg(&cl->device, "RX strans: %d frames\n", len); |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 779 | spin_lock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 780 | if (unlikely(ssi->main_state != ACTIVE)) { |
| 781 | dev_err(&cl->device, "START TRANS wrong state: S(%d) M(%d)\n", |
| 782 | ssi->send_state, ssi->main_state); |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 783 | spin_unlock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 784 | return; |
| 785 | } |
| 786 | ssip_set_rxstate(ssi, RECEIVING); |
| 787 | if (unlikely(SSIP_MSG_ID(cmd) != ssi->rxid)) { |
Jakub Wilk | c616ac2 | 2015-08-12 16:15:35 +0200 | [diff] [blame] | 788 | dev_err(&cl->device, "START TRANS id %d expected %d\n", |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 789 | SSIP_MSG_ID(cmd), ssi->rxid); |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 790 | spin_unlock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 791 | goto out1; |
| 792 | } |
| 793 | ssi->rxid++; |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 794 | spin_unlock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 795 | skb = netdev_alloc_skb(ssi->netdev, len * 4); |
| 796 | if (unlikely(!skb)) { |
| 797 | dev_err(&cl->device, "No memory for rx skb\n"); |
| 798 | goto out1; |
| 799 | } |
| 800 | skb->dev = ssi->netdev; |
| 801 | skb_put(skb, len * 4); |
| 802 | msg = ssip_alloc_data(ssi, skb, GFP_ATOMIC); |
| 803 | if (unlikely(!msg)) { |
| 804 | dev_err(&cl->device, "No memory for RX data msg\n"); |
| 805 | goto out2; |
| 806 | } |
| 807 | msg->complete = ssip_rx_data_complete; |
| 808 | hsi_async_read(cl, msg); |
| 809 | |
| 810 | return; |
| 811 | out2: |
| 812 | dev_kfree_skb(skb); |
| 813 | out1: |
| 814 | ssip_error(cl); |
| 815 | } |
| 816 | |
| 817 | static void ssip_rxcmd_complete(struct hsi_msg *msg) |
| 818 | { |
| 819 | struct hsi_client *cl = msg->cl; |
| 820 | u32 cmd = ssip_get_cmd(msg); |
| 821 | unsigned int cmdid = SSIP_COMMAND(cmd); |
| 822 | |
| 823 | if (msg->status == HSI_STATUS_ERROR) { |
| 824 | dev_err(&cl->device, "RX error detected\n"); |
| 825 | ssip_release_cmd(msg); |
| 826 | ssip_error(cl); |
| 827 | return; |
| 828 | } |
| 829 | hsi_async_read(cl, msg); |
| 830 | dev_dbg(&cl->device, "RX cmd: 0x%08x\n", cmd); |
| 831 | switch (cmdid) { |
| 832 | case SSIP_SW_BREAK: |
| 833 | /* Ignored */ |
| 834 | break; |
| 835 | case SSIP_BOOTINFO_REQ: |
| 836 | ssip_rx_bootinforeq(cl, cmd); |
| 837 | break; |
| 838 | case SSIP_BOOTINFO_RESP: |
| 839 | ssip_rx_bootinforesp(cl, cmd); |
| 840 | break; |
| 841 | case SSIP_WAKETEST_RESULT: |
| 842 | ssip_rx_waketest(cl, cmd); |
| 843 | break; |
| 844 | case SSIP_START_TRANS: |
| 845 | ssip_rx_strans(cl, cmd); |
| 846 | break; |
| 847 | case SSIP_READY: |
| 848 | ssip_rx_ready(cl); |
| 849 | break; |
| 850 | default: |
| 851 | dev_warn(&cl->device, "command 0x%08x not supported\n", cmd); |
| 852 | break; |
| 853 | } |
| 854 | } |
| 855 | |
| 856 | static void ssip_swbreak_complete(struct hsi_msg *msg) |
| 857 | { |
| 858 | struct hsi_client *cl = msg->cl; |
| 859 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); |
| 860 | |
| 861 | ssip_release_cmd(msg); |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 862 | spin_lock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 863 | if (list_empty(&ssi->txqueue)) { |
| 864 | if (atomic_read(&ssi->tx_usecnt)) { |
| 865 | ssip_set_txstate(ssi, SEND_READY); |
| 866 | } else { |
| 867 | ssip_set_txstate(ssi, SEND_IDLE); |
| 868 | hsi_stop_tx(cl); |
| 869 | } |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 870 | spin_unlock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 871 | } else { |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 872 | spin_unlock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 873 | ssip_xmit(cl); |
| 874 | } |
| 875 | netif_wake_queue(ssi->netdev); |
| 876 | } |
| 877 | |
| 878 | static void ssip_tx_data_complete(struct hsi_msg *msg) |
| 879 | { |
| 880 | struct hsi_client *cl = msg->cl; |
| 881 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); |
| 882 | struct hsi_msg *cmsg; |
| 883 | |
| 884 | if (msg->status == HSI_STATUS_ERROR) { |
| 885 | dev_err(&cl->device, "TX data error\n"); |
| 886 | ssip_error(cl); |
| 887 | goto out; |
| 888 | } |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 889 | spin_lock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 890 | if (list_empty(&ssi->txqueue)) { |
| 891 | ssip_set_txstate(ssi, SENDING_SWBREAK); |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 892 | spin_unlock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 893 | cmsg = ssip_claim_cmd(ssi); |
| 894 | ssip_set_cmd(cmsg, SSIP_SWBREAK_CMD); |
| 895 | cmsg->complete = ssip_swbreak_complete; |
| 896 | dev_dbg(&cl->device, "Send SWBREAK\n"); |
| 897 | hsi_async_write(cl, cmsg); |
| 898 | } else { |
Sebastian Reichel | 866dcb9 | 2016-06-18 00:57:20 +0200 | [diff] [blame] | 899 | spin_unlock_bh(&ssi->lock); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 900 | ssip_xmit(cl); |
| 901 | } |
| 902 | out: |
| 903 | ssip_free_data(msg); |
| 904 | } |
| 905 | |
Wei Yongjun | 0a0ea07 | 2014-07-20 13:17:20 +0800 | [diff] [blame] | 906 | static void ssip_port_event(struct hsi_client *cl, unsigned long event) |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 907 | { |
| 908 | switch (event) { |
| 909 | case HSI_EVENT_START_RX: |
| 910 | ssip_start_rx(cl); |
| 911 | break; |
| 912 | case HSI_EVENT_STOP_RX: |
| 913 | ssip_stop_rx(cl); |
| 914 | break; |
| 915 | default: |
| 916 | return; |
| 917 | } |
| 918 | } |
| 919 | |
| 920 | static int ssip_pn_open(struct net_device *dev) |
| 921 | { |
| 922 | struct hsi_client *cl = to_hsi_client(dev->dev.parent); |
| 923 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); |
| 924 | int err; |
| 925 | |
| 926 | err = hsi_claim_port(cl, 1); |
| 927 | if (err < 0) { |
| 928 | dev_err(&cl->device, "SSI port already claimed\n"); |
| 929 | return err; |
| 930 | } |
| 931 | err = hsi_register_port_event(cl, ssip_port_event); |
| 932 | if (err < 0) { |
| 933 | dev_err(&cl->device, "Register HSI port event failed (%d)\n", |
| 934 | err); |
| 935 | return err; |
| 936 | } |
| 937 | dev_dbg(&cl->device, "Configuring SSI port\n"); |
| 938 | hsi_setup(cl); |
Sebastian Reichel | 6d6c309 | 2016-06-18 00:55:22 +0200 | [diff] [blame] | 939 | |
| 940 | if (!test_and_set_bit(SSIP_WAKETEST_FLAG, &ssi->flags)) |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 941 | ssi_waketest(cl, 1); /* FIXME: To be removed */ |
Sebastian Reichel | 6d6c309 | 2016-06-18 00:55:22 +0200 | [diff] [blame] | 942 | |
| 943 | spin_lock_bh(&ssi->lock); |
Sebastian Reichel | 87d9906 | 2016-01-17 16:49:08 +0100 | [diff] [blame] | 944 | ssi->main_state = HANDSHAKE; |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 945 | spin_unlock_bh(&ssi->lock); |
| 946 | |
Sebastian Reichel | 87d9906 | 2016-01-17 16:49:08 +0100 | [diff] [blame] | 947 | ssip_send_bootinfo_req_cmd(cl); |
| 948 | |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 949 | return 0; |
| 950 | } |
| 951 | |
| 952 | static int ssip_pn_stop(struct net_device *dev) |
| 953 | { |
| 954 | struct hsi_client *cl = to_hsi_client(dev->dev.parent); |
| 955 | |
| 956 | ssip_reset(cl); |
| 957 | hsi_unregister_port_event(cl); |
| 958 | hsi_release_port(cl); |
| 959 | |
| 960 | return 0; |
| 961 | } |
| 962 | |
| 963 | static int ssip_pn_set_mtu(struct net_device *dev, int new_mtu) |
| 964 | { |
| 965 | if (new_mtu > SSIP_MAX_MTU || new_mtu < PHONET_MIN_MTU) |
| 966 | return -EINVAL; |
| 967 | dev->mtu = new_mtu; |
| 968 | |
| 969 | return 0; |
| 970 | } |
| 971 | |
Sebastian Reichel | df26d63 | 2016-06-18 00:58:39 +0200 | [diff] [blame] | 972 | static void ssip_xmit_work(struct work_struct *work) |
| 973 | { |
| 974 | struct ssi_protocol *ssi = |
| 975 | container_of(work, struct ssi_protocol, work); |
| 976 | struct hsi_client *cl = ssi->cl; |
| 977 | |
| 978 | ssip_xmit(cl); |
| 979 | } |
| 980 | |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 981 | static int ssip_pn_xmit(struct sk_buff *skb, struct net_device *dev) |
| 982 | { |
| 983 | struct hsi_client *cl = to_hsi_client(dev->dev.parent); |
| 984 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); |
| 985 | struct hsi_msg *msg; |
| 986 | |
| 987 | if ((skb->protocol != htons(ETH_P_PHONET)) || |
| 988 | (skb->len < SSIP_MIN_PN_HDR)) |
| 989 | goto drop; |
| 990 | /* Pad to 32-bits - FIXME: Revisit*/ |
| 991 | if ((skb->len & 3) && skb_pad(skb, 4 - (skb->len & 3))) |
| 992 | goto drop; |
| 993 | |
| 994 | /* |
| 995 | * Modem sends Phonet messages over SSI with its own endianess... |
| 996 | * Assume that modem has the same endianess as we do. |
| 997 | */ |
| 998 | if (skb_cow_head(skb, 0)) |
| 999 | goto drop; |
| 1000 | |
| 1001 | /* length field is exchanged in network byte order */ |
| 1002 | ((u16 *)skb->data)[2] = htons(((u16 *)skb->data)[2]); |
| 1003 | |
| 1004 | msg = ssip_alloc_data(ssi, skb, GFP_ATOMIC); |
| 1005 | if (!msg) { |
| 1006 | dev_dbg(&cl->device, "Dropping tx data: No memory\n"); |
| 1007 | goto drop; |
| 1008 | } |
| 1009 | msg->complete = ssip_tx_data_complete; |
| 1010 | |
| 1011 | spin_lock_bh(&ssi->lock); |
| 1012 | if (unlikely(ssi->main_state != ACTIVE)) { |
| 1013 | spin_unlock_bh(&ssi->lock); |
| 1014 | dev_dbg(&cl->device, "Dropping tx data: CMT is OFFLINE\n"); |
| 1015 | goto drop2; |
| 1016 | } |
| 1017 | list_add_tail(&msg->link, &ssi->txqueue); |
| 1018 | ssi->txqueue_len++; |
| 1019 | if (dev->tx_queue_len < ssi->txqueue_len) { |
| 1020 | dev_info(&cl->device, "TX queue full %d\n", ssi->txqueue_len); |
| 1021 | netif_stop_queue(dev); |
| 1022 | } |
| 1023 | if (ssi->send_state == SEND_IDLE) { |
| 1024 | ssip_set_txstate(ssi, WAIT4READY); |
| 1025 | spin_unlock_bh(&ssi->lock); |
| 1026 | dev_dbg(&cl->device, "Start TX qlen %d\n", ssi->txqueue_len); |
| 1027 | hsi_start_tx(cl); |
| 1028 | } else if (ssi->send_state == SEND_READY) { |
| 1029 | /* Needed for cmt-speech workaround */ |
| 1030 | dev_dbg(&cl->device, "Start TX on SEND READY qlen %d\n", |
| 1031 | ssi->txqueue_len); |
| 1032 | spin_unlock_bh(&ssi->lock); |
Sebastian Reichel | df26d63 | 2016-06-18 00:58:39 +0200 | [diff] [blame] | 1033 | schedule_work(&ssi->work); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 1034 | } else { |
| 1035 | spin_unlock_bh(&ssi->lock); |
| 1036 | } |
| 1037 | dev->stats.tx_packets++; |
| 1038 | dev->stats.tx_bytes += skb->len; |
| 1039 | |
| 1040 | return 0; |
| 1041 | drop2: |
| 1042 | hsi_free_msg(msg); |
| 1043 | drop: |
| 1044 | dev->stats.tx_dropped++; |
| 1045 | dev_kfree_skb(skb); |
| 1046 | |
| 1047 | return 0; |
| 1048 | } |
| 1049 | |
| 1050 | /* CMT reset event handler */ |
| 1051 | void ssip_reset_event(struct hsi_client *master) |
| 1052 | { |
| 1053 | struct ssi_protocol *ssi = hsi_client_drvdata(master); |
| 1054 | dev_err(&ssi->cl->device, "CMT reset detected!\n"); |
| 1055 | ssip_error(ssi->cl); |
| 1056 | } |
| 1057 | EXPORT_SYMBOL_GPL(ssip_reset_event); |
| 1058 | |
| 1059 | static const struct net_device_ops ssip_pn_ops = { |
| 1060 | .ndo_open = ssip_pn_open, |
| 1061 | .ndo_stop = ssip_pn_stop, |
| 1062 | .ndo_start_xmit = ssip_pn_xmit, |
| 1063 | .ndo_change_mtu = ssip_pn_set_mtu, |
| 1064 | }; |
| 1065 | |
| 1066 | static void ssip_pn_setup(struct net_device *dev) |
| 1067 | { |
| 1068 | dev->features = 0; |
| 1069 | dev->netdev_ops = &ssip_pn_ops; |
| 1070 | dev->type = ARPHRD_PHONET; |
| 1071 | dev->flags = IFF_POINTOPOINT | IFF_NOARP; |
| 1072 | dev->mtu = SSIP_DEFAULT_MTU; |
| 1073 | dev->hard_header_len = 1; |
| 1074 | dev->dev_addr[0] = PN_MEDIA_SOS; |
| 1075 | dev->addr_len = 1; |
| 1076 | dev->tx_queue_len = SSIP_TXQUEUE_LEN; |
| 1077 | |
| 1078 | dev->destructor = free_netdev; |
| 1079 | dev->header_ops = &phonet_header_ops; |
| 1080 | } |
| 1081 | |
| 1082 | static int ssi_protocol_probe(struct device *dev) |
| 1083 | { |
| 1084 | static const char ifname[] = "phonet%d"; |
| 1085 | struct hsi_client *cl = to_hsi_client(dev); |
| 1086 | struct ssi_protocol *ssi; |
| 1087 | int err; |
| 1088 | |
| 1089 | ssi = kzalloc(sizeof(*ssi), GFP_KERNEL); |
| 1090 | if (!ssi) { |
| 1091 | dev_err(dev, "No memory for ssi protocol\n"); |
| 1092 | return -ENOMEM; |
| 1093 | } |
| 1094 | |
| 1095 | spin_lock_init(&ssi->lock); |
| 1096 | init_timer_deferrable(&ssi->rx_wd); |
| 1097 | init_timer_deferrable(&ssi->tx_wd); |
| 1098 | init_timer(&ssi->keep_alive); |
| 1099 | ssi->rx_wd.data = (unsigned long)cl; |
| 1100 | ssi->rx_wd.function = ssip_wd; |
| 1101 | ssi->tx_wd.data = (unsigned long)cl; |
| 1102 | ssi->tx_wd.function = ssip_wd; |
| 1103 | ssi->keep_alive.data = (unsigned long)cl; |
| 1104 | ssi->keep_alive.function = ssip_keep_alive; |
| 1105 | INIT_LIST_HEAD(&ssi->txqueue); |
| 1106 | INIT_LIST_HEAD(&ssi->cmdqueue); |
| 1107 | atomic_set(&ssi->tx_usecnt, 0); |
| 1108 | hsi_client_set_drvdata(cl, ssi); |
| 1109 | ssi->cl = cl; |
Sebastian Reichel | df26d63 | 2016-06-18 00:58:39 +0200 | [diff] [blame] | 1110 | INIT_WORK(&ssi->work, ssip_xmit_work); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 1111 | |
| 1112 | ssi->channel_id_cmd = hsi_get_channel_id_by_name(cl, "mcsaab-control"); |
| 1113 | if (ssi->channel_id_cmd < 0) { |
| 1114 | err = ssi->channel_id_cmd; |
| 1115 | dev_err(dev, "Could not get cmd channel (%d)\n", err); |
| 1116 | goto out; |
| 1117 | } |
| 1118 | |
| 1119 | ssi->channel_id_data = hsi_get_channel_id_by_name(cl, "mcsaab-data"); |
| 1120 | if (ssi->channel_id_data < 0) { |
| 1121 | err = ssi->channel_id_data; |
| 1122 | dev_err(dev, "Could not get data channel (%d)\n", err); |
| 1123 | goto out; |
| 1124 | } |
| 1125 | |
| 1126 | err = ssip_alloc_cmds(ssi); |
| 1127 | if (err < 0) { |
| 1128 | dev_err(dev, "No memory for commands\n"); |
| 1129 | goto out; |
| 1130 | } |
| 1131 | |
Tom Gundersen | c835a67 | 2014-07-14 16:37:24 +0200 | [diff] [blame] | 1132 | ssi->netdev = alloc_netdev(0, ifname, NET_NAME_UNKNOWN, ssip_pn_setup); |
Sebastian Reichel | dc7bf5d | 2013-11-15 10:50:32 +0000 | [diff] [blame] | 1133 | if (!ssi->netdev) { |
| 1134 | dev_err(dev, "No memory for netdev\n"); |
| 1135 | err = -ENOMEM; |
| 1136 | goto out1; |
| 1137 | } |
| 1138 | |
| 1139 | SET_NETDEV_DEV(ssi->netdev, dev); |
| 1140 | netif_carrier_off(ssi->netdev); |
| 1141 | err = register_netdev(ssi->netdev); |
| 1142 | if (err < 0) { |
| 1143 | dev_err(dev, "Register netdev failed (%d)\n", err); |
| 1144 | goto out2; |
| 1145 | } |
| 1146 | |
| 1147 | list_add(&ssi->link, &ssip_list); |
| 1148 | |
| 1149 | dev_dbg(dev, "channel configuration: cmd=%d, data=%d\n", |
| 1150 | ssi->channel_id_cmd, ssi->channel_id_data); |
| 1151 | |
| 1152 | return 0; |
| 1153 | out2: |
| 1154 | free_netdev(ssi->netdev); |
| 1155 | out1: |
| 1156 | ssip_free_cmds(ssi); |
| 1157 | out: |
| 1158 | kfree(ssi); |
| 1159 | |
| 1160 | return err; |
| 1161 | } |
| 1162 | |
| 1163 | static int ssi_protocol_remove(struct device *dev) |
| 1164 | { |
| 1165 | struct hsi_client *cl = to_hsi_client(dev); |
| 1166 | struct ssi_protocol *ssi = hsi_client_drvdata(cl); |
| 1167 | |
| 1168 | list_del(&ssi->link); |
| 1169 | unregister_netdev(ssi->netdev); |
| 1170 | ssip_free_cmds(ssi); |
| 1171 | hsi_client_set_drvdata(cl, NULL); |
| 1172 | kfree(ssi); |
| 1173 | |
| 1174 | return 0; |
| 1175 | } |
| 1176 | |
| 1177 | static struct hsi_client_driver ssip_driver = { |
| 1178 | .driver = { |
| 1179 | .name = "ssi-protocol", |
| 1180 | .owner = THIS_MODULE, |
| 1181 | .probe = ssi_protocol_probe, |
| 1182 | .remove = ssi_protocol_remove, |
| 1183 | }, |
| 1184 | }; |
| 1185 | |
| 1186 | static int __init ssip_init(void) |
| 1187 | { |
| 1188 | pr_info("SSI protocol aka McSAAB added\n"); |
| 1189 | |
| 1190 | return hsi_register_client_driver(&ssip_driver); |
| 1191 | } |
| 1192 | module_init(ssip_init); |
| 1193 | |
| 1194 | static void __exit ssip_exit(void) |
| 1195 | { |
| 1196 | hsi_unregister_client_driver(&ssip_driver); |
| 1197 | pr_info("SSI protocol driver removed\n"); |
| 1198 | } |
| 1199 | module_exit(ssip_exit); |
| 1200 | |
| 1201 | MODULE_ALIAS("hsi:ssi-protocol"); |
| 1202 | MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>"); |
| 1203 | MODULE_AUTHOR("Remi Denis-Courmont <remi.denis-courmont@nokia.com>"); |
| 1204 | MODULE_DESCRIPTION("SSI protocol improved aka McSAAB"); |
| 1205 | MODULE_LICENSE("GPL"); |