sjur.brandeland@stericsson.com | dfae55d | 2010-10-27 08:34:40 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) ST-Ericsson AB 2010 |
| 3 | * Contact: Sjur Brendeland / sjur.brandeland@stericsson.com |
| 4 | * Authors: Amarnath Revanna / amarnath.bangalore.revanna@stericsson.com, |
| 5 | * Daniel Martensson / daniel.martensson@stericsson.com |
| 6 | * License terms: GNU General Public License (GPL) version 2 |
| 7 | */ |
| 8 | |
Kim Lilliestierna XX | e832932 | 2010-11-30 09:11:22 +0000 | [diff] [blame] | 9 | #define pr_fmt(fmt) KBUILD_MODNAME ":" fmt |
sjur.brandeland@stericsson.com | dfae55d | 2010-10-27 08:34:40 +0000 | [diff] [blame] | 10 | |
| 11 | #include <linux/spinlock.h> |
| 12 | #include <linux/sched.h> |
| 13 | #include <linux/list.h> |
| 14 | #include <linux/netdevice.h> |
| 15 | #include <linux/if_arp.h> |
| 16 | |
| 17 | #include <net/caif/caif_device.h> |
| 18 | #include <net/caif/caif_shm.h> |
| 19 | |
| 20 | #define NR_TX_BUF 6 |
| 21 | #define NR_RX_BUF 6 |
| 22 | #define TX_BUF_SZ 0x2000 |
| 23 | #define RX_BUF_SZ 0x2000 |
| 24 | |
| 25 | #define CAIF_NEEDED_HEADROOM 32 |
| 26 | |
| 27 | #define CAIF_FLOW_ON 1 |
| 28 | #define CAIF_FLOW_OFF 0 |
| 29 | |
| 30 | #define LOW_WATERMARK 3 |
| 31 | #define HIGH_WATERMARK 4 |
| 32 | |
| 33 | /* Maximum number of CAIF buffers per shared memory buffer. */ |
| 34 | #define SHM_MAX_FRMS_PER_BUF 10 |
| 35 | |
| 36 | /* |
| 37 | * Size in bytes of the descriptor area |
| 38 | * (With end of descriptor signalling) |
| 39 | */ |
| 40 | #define SHM_CAIF_DESC_SIZE ((SHM_MAX_FRMS_PER_BUF + 1) * \ |
| 41 | sizeof(struct shm_pck_desc)) |
| 42 | |
| 43 | /* |
| 44 | * Offset to the first CAIF frame within a shared memory buffer. |
| 45 | * Aligned on 32 bytes. |
| 46 | */ |
| 47 | #define SHM_CAIF_FRM_OFS (SHM_CAIF_DESC_SIZE + (SHM_CAIF_DESC_SIZE % 32)) |
| 48 | |
| 49 | /* Number of bytes for CAIF shared memory header. */ |
| 50 | #define SHM_HDR_LEN 1 |
| 51 | |
| 52 | /* Number of padding bytes for the complete CAIF frame. */ |
| 53 | #define SHM_FRM_PAD_LEN 4 |
| 54 | |
| 55 | #define CAIF_MAX_MTU 4096 |
| 56 | |
| 57 | #define SHM_SET_FULL(x) (((x+1) & 0x0F) << 0) |
| 58 | #define SHM_GET_FULL(x) (((x >> 0) & 0x0F) - 1) |
| 59 | |
| 60 | #define SHM_SET_EMPTY(x) (((x+1) & 0x0F) << 4) |
| 61 | #define SHM_GET_EMPTY(x) (((x >> 4) & 0x0F) - 1) |
| 62 | |
| 63 | #define SHM_FULL_MASK (0x0F << 0) |
| 64 | #define SHM_EMPTY_MASK (0x0F << 4) |
| 65 | |
| 66 | struct shm_pck_desc { |
| 67 | /* |
| 68 | * Offset from start of shared memory area to start of |
| 69 | * shared memory CAIF frame. |
| 70 | */ |
| 71 | u32 frm_ofs; |
| 72 | u32 frm_len; |
| 73 | }; |
| 74 | |
| 75 | struct buf_list { |
| 76 | unsigned char *desc_vptr; |
| 77 | u32 phy_addr; |
| 78 | u32 index; |
| 79 | u32 len; |
| 80 | u32 frames; |
| 81 | u32 frm_ofs; |
| 82 | struct list_head list; |
| 83 | }; |
| 84 | |
| 85 | struct shm_caif_frm { |
| 86 | /* Number of bytes of padding before the CAIF frame. */ |
| 87 | u8 hdr_ofs; |
| 88 | }; |
| 89 | |
| 90 | struct shmdrv_layer { |
| 91 | /* caif_dev_common must always be first in the structure*/ |
| 92 | struct caif_dev_common cfdev; |
| 93 | |
| 94 | u32 shm_tx_addr; |
| 95 | u32 shm_rx_addr; |
| 96 | u32 shm_base_addr; |
| 97 | u32 tx_empty_available; |
| 98 | spinlock_t lock; |
| 99 | |
| 100 | struct list_head tx_empty_list; |
| 101 | struct list_head tx_pend_list; |
| 102 | struct list_head tx_full_list; |
| 103 | struct list_head rx_empty_list; |
| 104 | struct list_head rx_pend_list; |
| 105 | struct list_head rx_full_list; |
| 106 | |
| 107 | struct workqueue_struct *pshm_tx_workqueue; |
| 108 | struct workqueue_struct *pshm_rx_workqueue; |
| 109 | |
| 110 | struct work_struct shm_tx_work; |
| 111 | struct work_struct shm_rx_work; |
| 112 | |
| 113 | struct sk_buff_head sk_qhead; |
| 114 | struct shmdev_layer *pshm_dev; |
| 115 | }; |
| 116 | |
| 117 | static int shm_netdev_open(struct net_device *shm_netdev) |
| 118 | { |
| 119 | netif_wake_queue(shm_netdev); |
| 120 | return 0; |
| 121 | } |
| 122 | |
| 123 | static int shm_netdev_close(struct net_device *shm_netdev) |
| 124 | { |
| 125 | netif_stop_queue(shm_netdev); |
| 126 | return 0; |
| 127 | } |
| 128 | |
| 129 | int caif_shmdrv_rx_cb(u32 mbx_msg, void *priv) |
| 130 | { |
| 131 | struct buf_list *pbuf; |
| 132 | struct shmdrv_layer *pshm_drv; |
| 133 | struct list_head *pos; |
| 134 | u32 avail_emptybuff = 0; |
| 135 | unsigned long flags = 0; |
| 136 | |
| 137 | pshm_drv = (struct shmdrv_layer *)priv; |
| 138 | |
| 139 | /* Check for received buffers. */ |
| 140 | if (mbx_msg & SHM_FULL_MASK) { |
| 141 | int idx; |
| 142 | |
| 143 | spin_lock_irqsave(&pshm_drv->lock, flags); |
| 144 | |
| 145 | /* Check whether we have any outstanding buffers. */ |
| 146 | if (list_empty(&pshm_drv->rx_empty_list)) { |
| 147 | |
| 148 | /* Release spin lock. */ |
| 149 | spin_unlock_irqrestore(&pshm_drv->lock, flags); |
| 150 | |
| 151 | /* We print even in IRQ context... */ |
| 152 | pr_warn("No empty Rx buffers to fill: " |
| 153 | "mbx_msg:%x\n", mbx_msg); |
| 154 | |
| 155 | /* Bail out. */ |
| 156 | goto err_sync; |
| 157 | } |
| 158 | |
| 159 | pbuf = |
| 160 | list_entry(pshm_drv->rx_empty_list.next, |
| 161 | struct buf_list, list); |
| 162 | idx = pbuf->index; |
| 163 | |
| 164 | /* Check buffer synchronization. */ |
| 165 | if (idx != SHM_GET_FULL(mbx_msg)) { |
| 166 | |
| 167 | /* We print even in IRQ context... */ |
| 168 | pr_warn( |
| 169 | "phyif_shm_mbx_msg_cb: RX full out of sync:" |
| 170 | " idx:%d, msg:%x SHM_GET_FULL(mbx_msg):%x\n", |
| 171 | idx, mbx_msg, SHM_GET_FULL(mbx_msg)); |
| 172 | |
| 173 | spin_unlock_irqrestore(&pshm_drv->lock, flags); |
| 174 | |
| 175 | /* Bail out. */ |
| 176 | goto err_sync; |
| 177 | } |
| 178 | |
| 179 | list_del_init(&pbuf->list); |
| 180 | list_add_tail(&pbuf->list, &pshm_drv->rx_full_list); |
| 181 | |
| 182 | spin_unlock_irqrestore(&pshm_drv->lock, flags); |
| 183 | |
| 184 | /* Schedule RX work queue. */ |
| 185 | if (!work_pending(&pshm_drv->shm_rx_work)) |
| 186 | queue_work(pshm_drv->pshm_rx_workqueue, |
| 187 | &pshm_drv->shm_rx_work); |
| 188 | } |
| 189 | |
| 190 | /* Check for emptied buffers. */ |
| 191 | if (mbx_msg & SHM_EMPTY_MASK) { |
| 192 | int idx; |
| 193 | |
| 194 | spin_lock_irqsave(&pshm_drv->lock, flags); |
| 195 | |
| 196 | /* Check whether we have any outstanding buffers. */ |
| 197 | if (list_empty(&pshm_drv->tx_full_list)) { |
| 198 | |
| 199 | /* We print even in IRQ context... */ |
| 200 | pr_warn("No TX to empty: msg:%x\n", mbx_msg); |
| 201 | |
| 202 | spin_unlock_irqrestore(&pshm_drv->lock, flags); |
| 203 | |
| 204 | /* Bail out. */ |
| 205 | goto err_sync; |
| 206 | } |
| 207 | |
| 208 | pbuf = |
| 209 | list_entry(pshm_drv->tx_full_list.next, |
| 210 | struct buf_list, list); |
| 211 | idx = pbuf->index; |
| 212 | |
| 213 | /* Check buffer synchronization. */ |
| 214 | if (idx != SHM_GET_EMPTY(mbx_msg)) { |
| 215 | |
| 216 | spin_unlock_irqrestore(&pshm_drv->lock, flags); |
| 217 | |
| 218 | /* We print even in IRQ context... */ |
| 219 | pr_warn("TX empty " |
| 220 | "out of sync:idx:%d, msg:%x\n", idx, mbx_msg); |
| 221 | |
| 222 | /* Bail out. */ |
| 223 | goto err_sync; |
| 224 | } |
| 225 | list_del_init(&pbuf->list); |
| 226 | |
| 227 | /* Reset buffer parameters. */ |
| 228 | pbuf->frames = 0; |
| 229 | pbuf->frm_ofs = SHM_CAIF_FRM_OFS; |
| 230 | |
| 231 | list_add_tail(&pbuf->list, &pshm_drv->tx_empty_list); |
| 232 | |
| 233 | /* Check the available no. of buffers in the empty list */ |
| 234 | list_for_each(pos, &pshm_drv->tx_empty_list) |
| 235 | avail_emptybuff++; |
| 236 | |
| 237 | /* Check whether we have to wake up the transmitter. */ |
| 238 | if ((avail_emptybuff > HIGH_WATERMARK) && |
| 239 | (!pshm_drv->tx_empty_available)) { |
| 240 | pshm_drv->tx_empty_available = 1; |
| 241 | pshm_drv->cfdev.flowctrl |
| 242 | (pshm_drv->pshm_dev->pshm_netdev, |
| 243 | CAIF_FLOW_ON); |
| 244 | |
| 245 | spin_unlock_irqrestore(&pshm_drv->lock, flags); |
| 246 | |
| 247 | /* Schedule the work queue. if required */ |
| 248 | if (!work_pending(&pshm_drv->shm_tx_work)) |
| 249 | queue_work(pshm_drv->pshm_tx_workqueue, |
| 250 | &pshm_drv->shm_tx_work); |
| 251 | } else |
| 252 | spin_unlock_irqrestore(&pshm_drv->lock, flags); |
| 253 | } |
| 254 | |
| 255 | return 0; |
| 256 | |
| 257 | err_sync: |
| 258 | return -EIO; |
| 259 | } |
| 260 | |
| 261 | static void shm_rx_work_func(struct work_struct *rx_work) |
| 262 | { |
| 263 | struct shmdrv_layer *pshm_drv; |
| 264 | struct buf_list *pbuf; |
| 265 | unsigned long flags = 0; |
| 266 | struct sk_buff *skb; |
| 267 | char *p; |
| 268 | int ret; |
| 269 | |
| 270 | pshm_drv = container_of(rx_work, struct shmdrv_layer, shm_rx_work); |
| 271 | |
| 272 | while (1) { |
| 273 | |
| 274 | struct shm_pck_desc *pck_desc; |
| 275 | |
| 276 | spin_lock_irqsave(&pshm_drv->lock, flags); |
| 277 | |
| 278 | /* Check for received buffers. */ |
| 279 | if (list_empty(&pshm_drv->rx_full_list)) { |
| 280 | spin_unlock_irqrestore(&pshm_drv->lock, flags); |
| 281 | break; |
| 282 | } |
| 283 | |
| 284 | pbuf = |
| 285 | list_entry(pshm_drv->rx_full_list.next, struct buf_list, |
| 286 | list); |
| 287 | list_del_init(&pbuf->list); |
| 288 | |
| 289 | /* Retrieve pointer to start of the packet descriptor area. */ |
| 290 | pck_desc = (struct shm_pck_desc *) pbuf->desc_vptr; |
| 291 | |
| 292 | /* |
| 293 | * Check whether descriptor contains a CAIF shared memory |
| 294 | * frame. |
| 295 | */ |
| 296 | while (pck_desc->frm_ofs) { |
| 297 | unsigned int frm_buf_ofs; |
| 298 | unsigned int frm_pck_ofs; |
| 299 | unsigned int frm_pck_len; |
| 300 | /* |
| 301 | * Check whether offset is within buffer limits |
| 302 | * (lower). |
| 303 | */ |
| 304 | if (pck_desc->frm_ofs < |
| 305 | (pbuf->phy_addr - pshm_drv->shm_base_addr)) |
| 306 | break; |
| 307 | /* |
| 308 | * Check whether offset is within buffer limits |
| 309 | * (higher). |
| 310 | */ |
| 311 | if (pck_desc->frm_ofs > |
| 312 | ((pbuf->phy_addr - pshm_drv->shm_base_addr) + |
| 313 | pbuf->len)) |
| 314 | break; |
| 315 | |
| 316 | /* Calculate offset from start of buffer. */ |
| 317 | frm_buf_ofs = |
| 318 | pck_desc->frm_ofs - (pbuf->phy_addr - |
| 319 | pshm_drv->shm_base_addr); |
| 320 | |
| 321 | /* |
| 322 | * Calculate offset and length of CAIF packet while |
| 323 | * taking care of the shared memory header. |
| 324 | */ |
| 325 | frm_pck_ofs = |
| 326 | frm_buf_ofs + SHM_HDR_LEN + |
| 327 | (*(pbuf->desc_vptr + frm_buf_ofs)); |
| 328 | frm_pck_len = |
| 329 | (pck_desc->frm_len - SHM_HDR_LEN - |
| 330 | (*(pbuf->desc_vptr + frm_buf_ofs))); |
| 331 | |
| 332 | /* Check whether CAIF packet is within buffer limits */ |
| 333 | if ((frm_pck_ofs + pck_desc->frm_len) > pbuf->len) |
| 334 | break; |
| 335 | |
| 336 | /* Get a suitable CAIF packet and copy in data. */ |
| 337 | skb = netdev_alloc_skb(pshm_drv->pshm_dev->pshm_netdev, |
| 338 | frm_pck_len + 1); |
| 339 | BUG_ON(skb == NULL); |
| 340 | |
| 341 | p = skb_put(skb, frm_pck_len); |
| 342 | memcpy(p, pbuf->desc_vptr + frm_pck_ofs, frm_pck_len); |
| 343 | |
| 344 | skb->protocol = htons(ETH_P_CAIF); |
| 345 | skb_reset_mac_header(skb); |
| 346 | skb->dev = pshm_drv->pshm_dev->pshm_netdev; |
| 347 | |
| 348 | /* Push received packet up the stack. */ |
| 349 | ret = netif_rx_ni(skb); |
| 350 | |
| 351 | if (!ret) { |
| 352 | pshm_drv->pshm_dev->pshm_netdev->stats. |
| 353 | rx_packets++; |
| 354 | pshm_drv->pshm_dev->pshm_netdev->stats. |
| 355 | rx_bytes += pck_desc->frm_len; |
| 356 | } else |
| 357 | ++pshm_drv->pshm_dev->pshm_netdev->stats. |
| 358 | rx_dropped; |
| 359 | /* Move to next packet descriptor. */ |
| 360 | pck_desc++; |
| 361 | } |
| 362 | |
| 363 | list_add_tail(&pbuf->list, &pshm_drv->rx_pend_list); |
| 364 | |
| 365 | spin_unlock_irqrestore(&pshm_drv->lock, flags); |
| 366 | |
| 367 | } |
| 368 | |
| 369 | /* Schedule the work queue. if required */ |
| 370 | if (!work_pending(&pshm_drv->shm_tx_work)) |
| 371 | queue_work(pshm_drv->pshm_tx_workqueue, &pshm_drv->shm_tx_work); |
| 372 | |
| 373 | } |
| 374 | |
| 375 | static void shm_tx_work_func(struct work_struct *tx_work) |
| 376 | { |
| 377 | u32 mbox_msg; |
| 378 | unsigned int frmlen, avail_emptybuff, append = 0; |
| 379 | unsigned long flags = 0; |
| 380 | struct buf_list *pbuf = NULL; |
| 381 | struct shmdrv_layer *pshm_drv; |
| 382 | struct shm_caif_frm *frm; |
| 383 | struct sk_buff *skb; |
| 384 | struct shm_pck_desc *pck_desc; |
| 385 | struct list_head *pos; |
| 386 | |
| 387 | pshm_drv = container_of(tx_work, struct shmdrv_layer, shm_tx_work); |
| 388 | |
| 389 | do { |
| 390 | /* Initialize mailbox message. */ |
| 391 | mbox_msg = 0x00; |
| 392 | avail_emptybuff = 0; |
| 393 | |
| 394 | spin_lock_irqsave(&pshm_drv->lock, flags); |
| 395 | |
| 396 | /* Check for pending receive buffers. */ |
| 397 | if (!list_empty(&pshm_drv->rx_pend_list)) { |
| 398 | |
| 399 | pbuf = list_entry(pshm_drv->rx_pend_list.next, |
| 400 | struct buf_list, list); |
| 401 | |
| 402 | list_del_init(&pbuf->list); |
| 403 | list_add_tail(&pbuf->list, &pshm_drv->rx_empty_list); |
| 404 | /* |
| 405 | * Value index is never changed, |
| 406 | * so read access should be safe. |
| 407 | */ |
| 408 | mbox_msg |= SHM_SET_EMPTY(pbuf->index); |
| 409 | } |
| 410 | |
| 411 | skb = skb_peek(&pshm_drv->sk_qhead); |
| 412 | |
| 413 | if (skb == NULL) |
| 414 | goto send_msg; |
| 415 | |
| 416 | /* Check the available no. of buffers in the empty list */ |
| 417 | list_for_each(pos, &pshm_drv->tx_empty_list) |
| 418 | avail_emptybuff++; |
| 419 | |
| 420 | if ((avail_emptybuff < LOW_WATERMARK) && |
| 421 | pshm_drv->tx_empty_available) { |
| 422 | /* Update blocking condition. */ |
| 423 | pshm_drv->tx_empty_available = 0; |
| 424 | pshm_drv->cfdev.flowctrl |
| 425 | (pshm_drv->pshm_dev->pshm_netdev, |
| 426 | CAIF_FLOW_OFF); |
| 427 | } |
| 428 | /* |
| 429 | * We simply return back to the caller if we do not have space |
| 430 | * either in Tx pending list or Tx empty list. In this case, |
| 431 | * we hold the received skb in the skb list, waiting to |
| 432 | * be transmitted once Tx buffers become available |
| 433 | */ |
| 434 | if (list_empty(&pshm_drv->tx_empty_list)) |
| 435 | goto send_msg; |
| 436 | |
| 437 | /* Get the first free Tx buffer. */ |
| 438 | pbuf = list_entry(pshm_drv->tx_empty_list.next, |
| 439 | struct buf_list, list); |
| 440 | do { |
| 441 | if (append) { |
| 442 | skb = skb_peek(&pshm_drv->sk_qhead); |
| 443 | if (skb == NULL) |
| 444 | break; |
| 445 | } |
| 446 | |
| 447 | frm = (struct shm_caif_frm *) |
| 448 | (pbuf->desc_vptr + pbuf->frm_ofs); |
| 449 | |
| 450 | frm->hdr_ofs = 0; |
| 451 | frmlen = 0; |
| 452 | frmlen += SHM_HDR_LEN + frm->hdr_ofs + skb->len; |
| 453 | |
| 454 | /* Add tail padding if needed. */ |
| 455 | if (frmlen % SHM_FRM_PAD_LEN) |
| 456 | frmlen += SHM_FRM_PAD_LEN - |
| 457 | (frmlen % SHM_FRM_PAD_LEN); |
| 458 | |
| 459 | /* |
| 460 | * Verify that packet, header and additional padding |
| 461 | * can fit within the buffer frame area. |
| 462 | */ |
| 463 | if (frmlen >= (pbuf->len - pbuf->frm_ofs)) |
| 464 | break; |
| 465 | |
| 466 | if (!append) { |
| 467 | list_del_init(&pbuf->list); |
| 468 | append = 1; |
| 469 | } |
| 470 | |
| 471 | skb = skb_dequeue(&pshm_drv->sk_qhead); |
| 472 | /* Copy in CAIF frame. */ |
| 473 | skb_copy_bits(skb, 0, pbuf->desc_vptr + |
| 474 | pbuf->frm_ofs + SHM_HDR_LEN + |
| 475 | frm->hdr_ofs, skb->len); |
| 476 | |
| 477 | pshm_drv->pshm_dev->pshm_netdev->stats.tx_packets++; |
| 478 | pshm_drv->pshm_dev->pshm_netdev->stats.tx_bytes += |
| 479 | frmlen; |
| 480 | dev_kfree_skb(skb); |
| 481 | |
| 482 | /* Fill in the shared memory packet descriptor area. */ |
| 483 | pck_desc = (struct shm_pck_desc *) (pbuf->desc_vptr); |
| 484 | /* Forward to current frame. */ |
| 485 | pck_desc += pbuf->frames; |
| 486 | pck_desc->frm_ofs = (pbuf->phy_addr - |
| 487 | pshm_drv->shm_base_addr) + |
| 488 | pbuf->frm_ofs; |
| 489 | pck_desc->frm_len = frmlen; |
| 490 | /* Terminate packet descriptor area. */ |
| 491 | pck_desc++; |
| 492 | pck_desc->frm_ofs = 0; |
| 493 | /* Update buffer parameters. */ |
| 494 | pbuf->frames++; |
| 495 | pbuf->frm_ofs += frmlen + (frmlen % 32); |
| 496 | |
| 497 | } while (pbuf->frames < SHM_MAX_FRMS_PER_BUF); |
| 498 | |
| 499 | /* Assign buffer as full. */ |
| 500 | list_add_tail(&pbuf->list, &pshm_drv->tx_full_list); |
| 501 | append = 0; |
| 502 | mbox_msg |= SHM_SET_FULL(pbuf->index); |
| 503 | send_msg: |
| 504 | spin_unlock_irqrestore(&pshm_drv->lock, flags); |
| 505 | |
| 506 | if (mbox_msg) |
| 507 | pshm_drv->pshm_dev->pshmdev_mbxsend |
| 508 | (pshm_drv->pshm_dev->shm_id, mbox_msg); |
| 509 | } while (mbox_msg); |
| 510 | } |
| 511 | |
| 512 | static int shm_netdev_tx(struct sk_buff *skb, struct net_device *shm_netdev) |
| 513 | { |
| 514 | struct shmdrv_layer *pshm_drv; |
| 515 | unsigned long flags = 0; |
| 516 | |
| 517 | pshm_drv = netdev_priv(shm_netdev); |
| 518 | |
| 519 | spin_lock_irqsave(&pshm_drv->lock, flags); |
| 520 | |
| 521 | skb_queue_tail(&pshm_drv->sk_qhead, skb); |
| 522 | |
| 523 | spin_unlock_irqrestore(&pshm_drv->lock, flags); |
| 524 | |
| 525 | /* Schedule Tx work queue. for deferred processing of skbs*/ |
| 526 | if (!work_pending(&pshm_drv->shm_tx_work)) |
| 527 | queue_work(pshm_drv->pshm_tx_workqueue, &pshm_drv->shm_tx_work); |
| 528 | |
| 529 | return 0; |
| 530 | } |
| 531 | |
| 532 | static const struct net_device_ops netdev_ops = { |
| 533 | .ndo_open = shm_netdev_open, |
| 534 | .ndo_stop = shm_netdev_close, |
| 535 | .ndo_start_xmit = shm_netdev_tx, |
| 536 | }; |
| 537 | |
| 538 | static void shm_netdev_setup(struct net_device *pshm_netdev) |
| 539 | { |
| 540 | struct shmdrv_layer *pshm_drv; |
| 541 | pshm_netdev->netdev_ops = &netdev_ops; |
| 542 | |
| 543 | pshm_netdev->mtu = CAIF_MAX_MTU; |
| 544 | pshm_netdev->type = ARPHRD_CAIF; |
| 545 | pshm_netdev->hard_header_len = CAIF_NEEDED_HEADROOM; |
| 546 | pshm_netdev->tx_queue_len = 0; |
| 547 | pshm_netdev->destructor = free_netdev; |
| 548 | |
| 549 | pshm_drv = netdev_priv(pshm_netdev); |
| 550 | |
| 551 | /* Initialize structures in a clean state. */ |
| 552 | memset(pshm_drv, 0, sizeof(struct shmdrv_layer)); |
| 553 | |
| 554 | pshm_drv->cfdev.link_select = CAIF_LINK_LOW_LATENCY; |
| 555 | } |
| 556 | |
| 557 | int caif_shmcore_probe(struct shmdev_layer *pshm_dev) |
| 558 | { |
| 559 | int result, j; |
| 560 | struct shmdrv_layer *pshm_drv = NULL; |
| 561 | |
| 562 | pshm_dev->pshm_netdev = alloc_netdev(sizeof(struct shmdrv_layer), |
| 563 | "cfshm%d", shm_netdev_setup); |
| 564 | if (!pshm_dev->pshm_netdev) |
| 565 | return -ENOMEM; |
| 566 | |
| 567 | pshm_drv = netdev_priv(pshm_dev->pshm_netdev); |
| 568 | pshm_drv->pshm_dev = pshm_dev; |
| 569 | |
| 570 | /* |
| 571 | * Initialization starts with the verification of the |
| 572 | * availability of MBX driver by calling its setup function. |
| 573 | * MBX driver must be available by this time for proper |
| 574 | * functioning of SHM driver. |
| 575 | */ |
| 576 | if ((pshm_dev->pshmdev_mbxsetup |
| 577 | (caif_shmdrv_rx_cb, pshm_dev, pshm_drv)) != 0) { |
| 578 | pr_warn("Could not config. SHM Mailbox," |
| 579 | " Bailing out.....\n"); |
| 580 | free_netdev(pshm_dev->pshm_netdev); |
| 581 | return -ENODEV; |
| 582 | } |
| 583 | |
| 584 | skb_queue_head_init(&pshm_drv->sk_qhead); |
| 585 | |
| 586 | pr_info("SHM DEVICE[%d] PROBED BY DRIVER, NEW SHM DRIVER" |
| 587 | " INSTANCE AT pshm_drv =0x%p\n", |
| 588 | pshm_drv->pshm_dev->shm_id, pshm_drv); |
| 589 | |
| 590 | if (pshm_dev->shm_total_sz < |
| 591 | (NR_TX_BUF * TX_BUF_SZ + NR_RX_BUF * RX_BUF_SZ)) { |
| 592 | |
| 593 | pr_warn("ERROR, Amount of available" |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 594 | " Phys. SHM cannot accommodate current SHM " |
sjur.brandeland@stericsson.com | dfae55d | 2010-10-27 08:34:40 +0000 | [diff] [blame] | 595 | "driver configuration, Bailing out ...\n"); |
| 596 | free_netdev(pshm_dev->pshm_netdev); |
| 597 | return -ENOMEM; |
| 598 | } |
| 599 | |
| 600 | pshm_drv->shm_base_addr = pshm_dev->shm_base_addr; |
| 601 | pshm_drv->shm_tx_addr = pshm_drv->shm_base_addr; |
| 602 | |
| 603 | if (pshm_dev->shm_loopback) |
| 604 | pshm_drv->shm_rx_addr = pshm_drv->shm_tx_addr; |
| 605 | else |
| 606 | pshm_drv->shm_rx_addr = pshm_dev->shm_base_addr + |
| 607 | (NR_TX_BUF * TX_BUF_SZ); |
| 608 | |
| 609 | INIT_LIST_HEAD(&pshm_drv->tx_empty_list); |
| 610 | INIT_LIST_HEAD(&pshm_drv->tx_pend_list); |
| 611 | INIT_LIST_HEAD(&pshm_drv->tx_full_list); |
| 612 | |
| 613 | INIT_LIST_HEAD(&pshm_drv->rx_empty_list); |
| 614 | INIT_LIST_HEAD(&pshm_drv->rx_pend_list); |
| 615 | INIT_LIST_HEAD(&pshm_drv->rx_full_list); |
| 616 | |
| 617 | INIT_WORK(&pshm_drv->shm_tx_work, shm_tx_work_func); |
| 618 | INIT_WORK(&pshm_drv->shm_rx_work, shm_rx_work_func); |
| 619 | |
| 620 | pshm_drv->pshm_tx_workqueue = |
| 621 | create_singlethread_workqueue("shm_tx_work"); |
| 622 | pshm_drv->pshm_rx_workqueue = |
| 623 | create_singlethread_workqueue("shm_rx_work"); |
| 624 | |
| 625 | for (j = 0; j < NR_TX_BUF; j++) { |
| 626 | struct buf_list *tx_buf = |
| 627 | kmalloc(sizeof(struct buf_list), GFP_KERNEL); |
| 628 | |
| 629 | if (tx_buf == NULL) { |
| 630 | pr_warn("ERROR, Could not" |
| 631 | " allocate dynamic mem. for tx_buf," |
| 632 | " Bailing out ...\n"); |
| 633 | free_netdev(pshm_dev->pshm_netdev); |
| 634 | return -ENOMEM; |
| 635 | } |
| 636 | tx_buf->index = j; |
| 637 | tx_buf->phy_addr = pshm_drv->shm_tx_addr + (TX_BUF_SZ * j); |
| 638 | tx_buf->len = TX_BUF_SZ; |
| 639 | tx_buf->frames = 0; |
| 640 | tx_buf->frm_ofs = SHM_CAIF_FRM_OFS; |
| 641 | |
| 642 | if (pshm_dev->shm_loopback) |
| 643 | tx_buf->desc_vptr = (char *)tx_buf->phy_addr; |
| 644 | else |
| 645 | tx_buf->desc_vptr = |
| 646 | ioremap(tx_buf->phy_addr, TX_BUF_SZ); |
| 647 | |
| 648 | list_add_tail(&tx_buf->list, &pshm_drv->tx_empty_list); |
| 649 | } |
| 650 | |
| 651 | for (j = 0; j < NR_RX_BUF; j++) { |
| 652 | struct buf_list *rx_buf = |
| 653 | kmalloc(sizeof(struct buf_list), GFP_KERNEL); |
| 654 | |
| 655 | if (rx_buf == NULL) { |
| 656 | pr_warn("ERROR, Could not" |
| 657 | " allocate dynamic mem.for rx_buf," |
| 658 | " Bailing out ...\n"); |
| 659 | free_netdev(pshm_dev->pshm_netdev); |
| 660 | return -ENOMEM; |
| 661 | } |
| 662 | rx_buf->index = j; |
| 663 | rx_buf->phy_addr = pshm_drv->shm_rx_addr + (RX_BUF_SZ * j); |
| 664 | rx_buf->len = RX_BUF_SZ; |
| 665 | |
| 666 | if (pshm_dev->shm_loopback) |
| 667 | rx_buf->desc_vptr = (char *)rx_buf->phy_addr; |
| 668 | else |
| 669 | rx_buf->desc_vptr = |
| 670 | ioremap(rx_buf->phy_addr, RX_BUF_SZ); |
| 671 | list_add_tail(&rx_buf->list, &pshm_drv->rx_empty_list); |
| 672 | } |
| 673 | |
| 674 | pshm_drv->tx_empty_available = 1; |
| 675 | result = register_netdev(pshm_dev->pshm_netdev); |
| 676 | if (result) |
| 677 | pr_warn("ERROR[%d], SHM could not, " |
| 678 | "register with NW FRMWK Bailing out ...\n", result); |
| 679 | |
| 680 | return result; |
| 681 | } |
| 682 | |
| 683 | void caif_shmcore_remove(struct net_device *pshm_netdev) |
| 684 | { |
| 685 | struct buf_list *pbuf; |
| 686 | struct shmdrv_layer *pshm_drv = NULL; |
| 687 | |
| 688 | pshm_drv = netdev_priv(pshm_netdev); |
| 689 | |
| 690 | while (!(list_empty(&pshm_drv->tx_pend_list))) { |
| 691 | pbuf = |
| 692 | list_entry(pshm_drv->tx_pend_list.next, |
| 693 | struct buf_list, list); |
| 694 | |
| 695 | list_del(&pbuf->list); |
| 696 | kfree(pbuf); |
| 697 | } |
| 698 | |
| 699 | while (!(list_empty(&pshm_drv->tx_full_list))) { |
| 700 | pbuf = |
| 701 | list_entry(pshm_drv->tx_full_list.next, |
| 702 | struct buf_list, list); |
| 703 | list_del(&pbuf->list); |
| 704 | kfree(pbuf); |
| 705 | } |
| 706 | |
| 707 | while (!(list_empty(&pshm_drv->tx_empty_list))) { |
| 708 | pbuf = |
| 709 | list_entry(pshm_drv->tx_empty_list.next, |
| 710 | struct buf_list, list); |
| 711 | list_del(&pbuf->list); |
| 712 | kfree(pbuf); |
| 713 | } |
| 714 | |
| 715 | while (!(list_empty(&pshm_drv->rx_full_list))) { |
| 716 | pbuf = |
| 717 | list_entry(pshm_drv->tx_full_list.next, |
| 718 | struct buf_list, list); |
| 719 | list_del(&pbuf->list); |
| 720 | kfree(pbuf); |
| 721 | } |
| 722 | |
| 723 | while (!(list_empty(&pshm_drv->rx_pend_list))) { |
| 724 | pbuf = |
| 725 | list_entry(pshm_drv->tx_pend_list.next, |
| 726 | struct buf_list, list); |
| 727 | list_del(&pbuf->list); |
| 728 | kfree(pbuf); |
| 729 | } |
| 730 | |
| 731 | while (!(list_empty(&pshm_drv->rx_empty_list))) { |
| 732 | pbuf = |
| 733 | list_entry(pshm_drv->rx_empty_list.next, |
| 734 | struct buf_list, list); |
| 735 | list_del(&pbuf->list); |
| 736 | kfree(pbuf); |
| 737 | } |
| 738 | |
| 739 | /* Destroy work queues. */ |
| 740 | destroy_workqueue(pshm_drv->pshm_tx_workqueue); |
| 741 | destroy_workqueue(pshm_drv->pshm_rx_workqueue); |
| 742 | |
| 743 | unregister_netdev(pshm_netdev); |
| 744 | } |