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 | |
Joe Perches | 43d620c | 2011-06-16 19:08:06 +0000 | [diff] [blame] | 137 | pshm_drv = priv; |
sjur.brandeland@stericsson.com | dfae55d | 2010-10-27 08:34:40 +0000 | [diff] [blame] | 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; |
sjur.brandeland@stericsson.com | 095d2a7 | 2011-12-06 12:15:43 +0000 | [diff] [blame] | 241 | spin_unlock_irqrestore(&pshm_drv->lock, flags); |
sjur.brandeland@stericsson.com | dfae55d | 2010-10-27 08:34:40 +0000 | [diff] [blame] | 242 | pshm_drv->cfdev.flowctrl |
| 243 | (pshm_drv->pshm_dev->pshm_netdev, |
| 244 | CAIF_FLOW_ON); |
| 245 | |
sjur.brandeland@stericsson.com | dfae55d | 2010-10-27 08:34:40 +0000 | [diff] [blame] | 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); |
sjur.brandeland@stericsson.com | 095d2a7 | 2011-12-06 12:15:43 +0000 | [diff] [blame] | 288 | spin_unlock_irqrestore(&pshm_drv->lock, flags); |
sjur.brandeland@stericsson.com | dfae55d | 2010-10-27 08:34:40 +0000 | [diff] [blame] | 289 | |
| 290 | /* Retrieve pointer to start of the packet descriptor area. */ |
| 291 | pck_desc = (struct shm_pck_desc *) pbuf->desc_vptr; |
| 292 | |
| 293 | /* |
| 294 | * Check whether descriptor contains a CAIF shared memory |
| 295 | * frame. |
| 296 | */ |
| 297 | while (pck_desc->frm_ofs) { |
| 298 | unsigned int frm_buf_ofs; |
| 299 | unsigned int frm_pck_ofs; |
| 300 | unsigned int frm_pck_len; |
| 301 | /* |
| 302 | * Check whether offset is within buffer limits |
| 303 | * (lower). |
| 304 | */ |
| 305 | if (pck_desc->frm_ofs < |
| 306 | (pbuf->phy_addr - pshm_drv->shm_base_addr)) |
| 307 | break; |
| 308 | /* |
| 309 | * Check whether offset is within buffer limits |
| 310 | * (higher). |
| 311 | */ |
| 312 | if (pck_desc->frm_ofs > |
| 313 | ((pbuf->phy_addr - pshm_drv->shm_base_addr) + |
| 314 | pbuf->len)) |
| 315 | break; |
| 316 | |
| 317 | /* Calculate offset from start of buffer. */ |
| 318 | frm_buf_ofs = |
| 319 | pck_desc->frm_ofs - (pbuf->phy_addr - |
| 320 | pshm_drv->shm_base_addr); |
| 321 | |
| 322 | /* |
| 323 | * Calculate offset and length of CAIF packet while |
| 324 | * taking care of the shared memory header. |
| 325 | */ |
| 326 | frm_pck_ofs = |
| 327 | frm_buf_ofs + SHM_HDR_LEN + |
| 328 | (*(pbuf->desc_vptr + frm_buf_ofs)); |
| 329 | frm_pck_len = |
| 330 | (pck_desc->frm_len - SHM_HDR_LEN - |
| 331 | (*(pbuf->desc_vptr + frm_buf_ofs))); |
| 332 | |
| 333 | /* Check whether CAIF packet is within buffer limits */ |
| 334 | if ((frm_pck_ofs + pck_desc->frm_len) > pbuf->len) |
| 335 | break; |
| 336 | |
| 337 | /* Get a suitable CAIF packet and copy in data. */ |
| 338 | skb = netdev_alloc_skb(pshm_drv->pshm_dev->pshm_netdev, |
| 339 | frm_pck_len + 1); |
Roar Førde | f84ea77 | 2011-12-06 12:15:44 +0000 | [diff] [blame] | 340 | |
| 341 | if (skb == NULL) { |
| 342 | pr_info("OOM: Try next frame in descriptor\n"); |
| 343 | break; |
| 344 | } |
sjur.brandeland@stericsson.com | dfae55d | 2010-10-27 08:34:40 +0000 | [diff] [blame] | 345 | |
| 346 | p = skb_put(skb, frm_pck_len); |
| 347 | memcpy(p, pbuf->desc_vptr + frm_pck_ofs, frm_pck_len); |
| 348 | |
| 349 | skb->protocol = htons(ETH_P_CAIF); |
| 350 | skb_reset_mac_header(skb); |
| 351 | skb->dev = pshm_drv->pshm_dev->pshm_netdev; |
| 352 | |
| 353 | /* Push received packet up the stack. */ |
| 354 | ret = netif_rx_ni(skb); |
| 355 | |
| 356 | if (!ret) { |
| 357 | pshm_drv->pshm_dev->pshm_netdev->stats. |
| 358 | rx_packets++; |
| 359 | pshm_drv->pshm_dev->pshm_netdev->stats. |
| 360 | rx_bytes += pck_desc->frm_len; |
| 361 | } else |
| 362 | ++pshm_drv->pshm_dev->pshm_netdev->stats. |
| 363 | rx_dropped; |
| 364 | /* Move to next packet descriptor. */ |
| 365 | pck_desc++; |
| 366 | } |
| 367 | |
sjur.brandeland@stericsson.com | 095d2a7 | 2011-12-06 12:15:43 +0000 | [diff] [blame] | 368 | spin_lock_irqsave(&pshm_drv->lock, flags); |
sjur.brandeland@stericsson.com | dfae55d | 2010-10-27 08:34:40 +0000 | [diff] [blame] | 369 | list_add_tail(&pbuf->list, &pshm_drv->rx_pend_list); |
| 370 | |
| 371 | spin_unlock_irqrestore(&pshm_drv->lock, flags); |
| 372 | |
| 373 | } |
| 374 | |
| 375 | /* Schedule the work queue. if required */ |
| 376 | if (!work_pending(&pshm_drv->shm_tx_work)) |
| 377 | queue_work(pshm_drv->pshm_tx_workqueue, &pshm_drv->shm_tx_work); |
| 378 | |
| 379 | } |
| 380 | |
| 381 | static void shm_tx_work_func(struct work_struct *tx_work) |
| 382 | { |
| 383 | u32 mbox_msg; |
| 384 | unsigned int frmlen, avail_emptybuff, append = 0; |
| 385 | unsigned long flags = 0; |
| 386 | struct buf_list *pbuf = NULL; |
| 387 | struct shmdrv_layer *pshm_drv; |
| 388 | struct shm_caif_frm *frm; |
| 389 | struct sk_buff *skb; |
| 390 | struct shm_pck_desc *pck_desc; |
| 391 | struct list_head *pos; |
| 392 | |
| 393 | pshm_drv = container_of(tx_work, struct shmdrv_layer, shm_tx_work); |
| 394 | |
| 395 | do { |
| 396 | /* Initialize mailbox message. */ |
| 397 | mbox_msg = 0x00; |
| 398 | avail_emptybuff = 0; |
| 399 | |
| 400 | spin_lock_irqsave(&pshm_drv->lock, flags); |
| 401 | |
| 402 | /* Check for pending receive buffers. */ |
| 403 | if (!list_empty(&pshm_drv->rx_pend_list)) { |
| 404 | |
| 405 | pbuf = list_entry(pshm_drv->rx_pend_list.next, |
| 406 | struct buf_list, list); |
| 407 | |
| 408 | list_del_init(&pbuf->list); |
| 409 | list_add_tail(&pbuf->list, &pshm_drv->rx_empty_list); |
| 410 | /* |
| 411 | * Value index is never changed, |
| 412 | * so read access should be safe. |
| 413 | */ |
| 414 | mbox_msg |= SHM_SET_EMPTY(pbuf->index); |
| 415 | } |
| 416 | |
| 417 | skb = skb_peek(&pshm_drv->sk_qhead); |
| 418 | |
| 419 | if (skb == NULL) |
| 420 | goto send_msg; |
sjur.brandeland@stericsson.com | dfae55d | 2010-10-27 08:34:40 +0000 | [diff] [blame] | 421 | /* Check the available no. of buffers in the empty list */ |
| 422 | list_for_each(pos, &pshm_drv->tx_empty_list) |
| 423 | avail_emptybuff++; |
| 424 | |
| 425 | if ((avail_emptybuff < LOW_WATERMARK) && |
| 426 | pshm_drv->tx_empty_available) { |
| 427 | /* Update blocking condition. */ |
| 428 | pshm_drv->tx_empty_available = 0; |
sjur.brandeland@stericsson.com | 095d2a7 | 2011-12-06 12:15:43 +0000 | [diff] [blame] | 429 | spin_unlock_irqrestore(&pshm_drv->lock, flags); |
sjur.brandeland@stericsson.com | dfae55d | 2010-10-27 08:34:40 +0000 | [diff] [blame] | 430 | pshm_drv->cfdev.flowctrl |
| 431 | (pshm_drv->pshm_dev->pshm_netdev, |
| 432 | CAIF_FLOW_OFF); |
sjur.brandeland@stericsson.com | 095d2a7 | 2011-12-06 12:15:43 +0000 | [diff] [blame] | 433 | spin_lock_irqsave(&pshm_drv->lock, flags); |
sjur.brandeland@stericsson.com | dfae55d | 2010-10-27 08:34:40 +0000 | [diff] [blame] | 434 | } |
| 435 | /* |
| 436 | * We simply return back to the caller if we do not have space |
| 437 | * either in Tx pending list or Tx empty list. In this case, |
| 438 | * we hold the received skb in the skb list, waiting to |
| 439 | * be transmitted once Tx buffers become available |
| 440 | */ |
| 441 | if (list_empty(&pshm_drv->tx_empty_list)) |
| 442 | goto send_msg; |
| 443 | |
| 444 | /* Get the first free Tx buffer. */ |
| 445 | pbuf = list_entry(pshm_drv->tx_empty_list.next, |
| 446 | struct buf_list, list); |
| 447 | do { |
| 448 | if (append) { |
| 449 | skb = skb_peek(&pshm_drv->sk_qhead); |
| 450 | if (skb == NULL) |
| 451 | break; |
| 452 | } |
| 453 | |
| 454 | frm = (struct shm_caif_frm *) |
| 455 | (pbuf->desc_vptr + pbuf->frm_ofs); |
| 456 | |
| 457 | frm->hdr_ofs = 0; |
| 458 | frmlen = 0; |
| 459 | frmlen += SHM_HDR_LEN + frm->hdr_ofs + skb->len; |
| 460 | |
| 461 | /* Add tail padding if needed. */ |
| 462 | if (frmlen % SHM_FRM_PAD_LEN) |
| 463 | frmlen += SHM_FRM_PAD_LEN - |
| 464 | (frmlen % SHM_FRM_PAD_LEN); |
| 465 | |
| 466 | /* |
| 467 | * Verify that packet, header and additional padding |
| 468 | * can fit within the buffer frame area. |
| 469 | */ |
| 470 | if (frmlen >= (pbuf->len - pbuf->frm_ofs)) |
| 471 | break; |
| 472 | |
| 473 | if (!append) { |
| 474 | list_del_init(&pbuf->list); |
| 475 | append = 1; |
| 476 | } |
| 477 | |
| 478 | skb = skb_dequeue(&pshm_drv->sk_qhead); |
sjur.brandeland@stericsson.com | 095d2a7 | 2011-12-06 12:15:43 +0000 | [diff] [blame] | 479 | if (skb == NULL) |
| 480 | break; |
sjur.brandeland@stericsson.com | dfae55d | 2010-10-27 08:34:40 +0000 | [diff] [blame] | 481 | /* Copy in CAIF frame. */ |
| 482 | skb_copy_bits(skb, 0, pbuf->desc_vptr + |
| 483 | pbuf->frm_ofs + SHM_HDR_LEN + |
| 484 | frm->hdr_ofs, skb->len); |
| 485 | |
| 486 | pshm_drv->pshm_dev->pshm_netdev->stats.tx_packets++; |
| 487 | pshm_drv->pshm_dev->pshm_netdev->stats.tx_bytes += |
| 488 | frmlen; |
sjur.brandeland@stericsson.com | 095d2a7 | 2011-12-06 12:15:43 +0000 | [diff] [blame] | 489 | dev_kfree_skb_irq(skb); |
sjur.brandeland@stericsson.com | dfae55d | 2010-10-27 08:34:40 +0000 | [diff] [blame] | 490 | |
| 491 | /* Fill in the shared memory packet descriptor area. */ |
| 492 | pck_desc = (struct shm_pck_desc *) (pbuf->desc_vptr); |
| 493 | /* Forward to current frame. */ |
| 494 | pck_desc += pbuf->frames; |
| 495 | pck_desc->frm_ofs = (pbuf->phy_addr - |
| 496 | pshm_drv->shm_base_addr) + |
| 497 | pbuf->frm_ofs; |
| 498 | pck_desc->frm_len = frmlen; |
| 499 | /* Terminate packet descriptor area. */ |
| 500 | pck_desc++; |
| 501 | pck_desc->frm_ofs = 0; |
| 502 | /* Update buffer parameters. */ |
| 503 | pbuf->frames++; |
| 504 | pbuf->frm_ofs += frmlen + (frmlen % 32); |
| 505 | |
| 506 | } while (pbuf->frames < SHM_MAX_FRMS_PER_BUF); |
| 507 | |
| 508 | /* Assign buffer as full. */ |
| 509 | list_add_tail(&pbuf->list, &pshm_drv->tx_full_list); |
| 510 | append = 0; |
| 511 | mbox_msg |= SHM_SET_FULL(pbuf->index); |
| 512 | send_msg: |
| 513 | spin_unlock_irqrestore(&pshm_drv->lock, flags); |
| 514 | |
| 515 | if (mbox_msg) |
| 516 | pshm_drv->pshm_dev->pshmdev_mbxsend |
| 517 | (pshm_drv->pshm_dev->shm_id, mbox_msg); |
| 518 | } while (mbox_msg); |
| 519 | } |
| 520 | |
| 521 | static int shm_netdev_tx(struct sk_buff *skb, struct net_device *shm_netdev) |
| 522 | { |
| 523 | struct shmdrv_layer *pshm_drv; |
sjur.brandeland@stericsson.com | dfae55d | 2010-10-27 08:34:40 +0000 | [diff] [blame] | 524 | |
| 525 | pshm_drv = netdev_priv(shm_netdev); |
| 526 | |
sjur.brandeland@stericsson.com | dfae55d | 2010-10-27 08:34:40 +0000 | [diff] [blame] | 527 | skb_queue_tail(&pshm_drv->sk_qhead, skb); |
| 528 | |
sjur.brandeland@stericsson.com | dfae55d | 2010-10-27 08:34:40 +0000 | [diff] [blame] | 529 | /* Schedule Tx work queue. for deferred processing of skbs*/ |
| 530 | if (!work_pending(&pshm_drv->shm_tx_work)) |
| 531 | queue_work(pshm_drv->pshm_tx_workqueue, &pshm_drv->shm_tx_work); |
| 532 | |
| 533 | return 0; |
| 534 | } |
| 535 | |
| 536 | static const struct net_device_ops netdev_ops = { |
| 537 | .ndo_open = shm_netdev_open, |
| 538 | .ndo_stop = shm_netdev_close, |
| 539 | .ndo_start_xmit = shm_netdev_tx, |
| 540 | }; |
| 541 | |
| 542 | static void shm_netdev_setup(struct net_device *pshm_netdev) |
| 543 | { |
| 544 | struct shmdrv_layer *pshm_drv; |
| 545 | pshm_netdev->netdev_ops = &netdev_ops; |
| 546 | |
| 547 | pshm_netdev->mtu = CAIF_MAX_MTU; |
| 548 | pshm_netdev->type = ARPHRD_CAIF; |
| 549 | pshm_netdev->hard_header_len = CAIF_NEEDED_HEADROOM; |
| 550 | pshm_netdev->tx_queue_len = 0; |
| 551 | pshm_netdev->destructor = free_netdev; |
| 552 | |
| 553 | pshm_drv = netdev_priv(pshm_netdev); |
| 554 | |
| 555 | /* Initialize structures in a clean state. */ |
| 556 | memset(pshm_drv, 0, sizeof(struct shmdrv_layer)); |
| 557 | |
| 558 | pshm_drv->cfdev.link_select = CAIF_LINK_LOW_LATENCY; |
| 559 | } |
| 560 | |
| 561 | int caif_shmcore_probe(struct shmdev_layer *pshm_dev) |
| 562 | { |
| 563 | int result, j; |
| 564 | struct shmdrv_layer *pshm_drv = NULL; |
| 565 | |
| 566 | pshm_dev->pshm_netdev = alloc_netdev(sizeof(struct shmdrv_layer), |
| 567 | "cfshm%d", shm_netdev_setup); |
| 568 | if (!pshm_dev->pshm_netdev) |
| 569 | return -ENOMEM; |
| 570 | |
| 571 | pshm_drv = netdev_priv(pshm_dev->pshm_netdev); |
| 572 | pshm_drv->pshm_dev = pshm_dev; |
| 573 | |
| 574 | /* |
| 575 | * Initialization starts with the verification of the |
| 576 | * availability of MBX driver by calling its setup function. |
| 577 | * MBX driver must be available by this time for proper |
| 578 | * functioning of SHM driver. |
| 579 | */ |
| 580 | if ((pshm_dev->pshmdev_mbxsetup |
| 581 | (caif_shmdrv_rx_cb, pshm_dev, pshm_drv)) != 0) { |
| 582 | pr_warn("Could not config. SHM Mailbox," |
| 583 | " Bailing out.....\n"); |
| 584 | free_netdev(pshm_dev->pshm_netdev); |
| 585 | return -ENODEV; |
| 586 | } |
| 587 | |
| 588 | skb_queue_head_init(&pshm_drv->sk_qhead); |
| 589 | |
| 590 | pr_info("SHM DEVICE[%d] PROBED BY DRIVER, NEW SHM DRIVER" |
| 591 | " INSTANCE AT pshm_drv =0x%p\n", |
| 592 | pshm_drv->pshm_dev->shm_id, pshm_drv); |
| 593 | |
| 594 | if (pshm_dev->shm_total_sz < |
| 595 | (NR_TX_BUF * TX_BUF_SZ + NR_RX_BUF * RX_BUF_SZ)) { |
| 596 | |
| 597 | pr_warn("ERROR, Amount of available" |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 598 | " Phys. SHM cannot accommodate current SHM " |
sjur.brandeland@stericsson.com | dfae55d | 2010-10-27 08:34:40 +0000 | [diff] [blame] | 599 | "driver configuration, Bailing out ...\n"); |
| 600 | free_netdev(pshm_dev->pshm_netdev); |
| 601 | return -ENOMEM; |
| 602 | } |
| 603 | |
| 604 | pshm_drv->shm_base_addr = pshm_dev->shm_base_addr; |
| 605 | pshm_drv->shm_tx_addr = pshm_drv->shm_base_addr; |
| 606 | |
| 607 | if (pshm_dev->shm_loopback) |
| 608 | pshm_drv->shm_rx_addr = pshm_drv->shm_tx_addr; |
| 609 | else |
| 610 | pshm_drv->shm_rx_addr = pshm_dev->shm_base_addr + |
| 611 | (NR_TX_BUF * TX_BUF_SZ); |
| 612 | |
sjur.brandeland@stericsson.com | 095d2a7 | 2011-12-06 12:15:43 +0000 | [diff] [blame] | 613 | spin_lock_init(&pshm_drv->lock); |
sjur.brandeland@stericsson.com | dfae55d | 2010-10-27 08:34:40 +0000 | [diff] [blame] | 614 | INIT_LIST_HEAD(&pshm_drv->tx_empty_list); |
| 615 | INIT_LIST_HEAD(&pshm_drv->tx_pend_list); |
| 616 | INIT_LIST_HEAD(&pshm_drv->tx_full_list); |
| 617 | |
| 618 | INIT_LIST_HEAD(&pshm_drv->rx_empty_list); |
| 619 | INIT_LIST_HEAD(&pshm_drv->rx_pend_list); |
| 620 | INIT_LIST_HEAD(&pshm_drv->rx_full_list); |
| 621 | |
| 622 | INIT_WORK(&pshm_drv->shm_tx_work, shm_tx_work_func); |
| 623 | INIT_WORK(&pshm_drv->shm_rx_work, shm_rx_work_func); |
| 624 | |
| 625 | pshm_drv->pshm_tx_workqueue = |
| 626 | create_singlethread_workqueue("shm_tx_work"); |
| 627 | pshm_drv->pshm_rx_workqueue = |
| 628 | create_singlethread_workqueue("shm_rx_work"); |
| 629 | |
| 630 | for (j = 0; j < NR_TX_BUF; j++) { |
| 631 | struct buf_list *tx_buf = |
| 632 | kmalloc(sizeof(struct buf_list), GFP_KERNEL); |
| 633 | |
| 634 | if (tx_buf == NULL) { |
| 635 | pr_warn("ERROR, Could not" |
| 636 | " allocate dynamic mem. for tx_buf," |
| 637 | " Bailing out ...\n"); |
| 638 | free_netdev(pshm_dev->pshm_netdev); |
| 639 | return -ENOMEM; |
| 640 | } |
| 641 | tx_buf->index = j; |
| 642 | tx_buf->phy_addr = pshm_drv->shm_tx_addr + (TX_BUF_SZ * j); |
| 643 | tx_buf->len = TX_BUF_SZ; |
| 644 | tx_buf->frames = 0; |
| 645 | tx_buf->frm_ofs = SHM_CAIF_FRM_OFS; |
| 646 | |
| 647 | if (pshm_dev->shm_loopback) |
sjur.brandeland@stericsson.com | 095d2a7 | 2011-12-06 12:15:43 +0000 | [diff] [blame] | 648 | tx_buf->desc_vptr = (unsigned char *)tx_buf->phy_addr; |
sjur.brandeland@stericsson.com | dfae55d | 2010-10-27 08:34:40 +0000 | [diff] [blame] | 649 | else |
| 650 | tx_buf->desc_vptr = |
| 651 | ioremap(tx_buf->phy_addr, TX_BUF_SZ); |
| 652 | |
| 653 | list_add_tail(&tx_buf->list, &pshm_drv->tx_empty_list); |
| 654 | } |
| 655 | |
| 656 | for (j = 0; j < NR_RX_BUF; j++) { |
| 657 | struct buf_list *rx_buf = |
| 658 | kmalloc(sizeof(struct buf_list), GFP_KERNEL); |
| 659 | |
| 660 | if (rx_buf == NULL) { |
| 661 | pr_warn("ERROR, Could not" |
| 662 | " allocate dynamic mem.for rx_buf," |
| 663 | " Bailing out ...\n"); |
| 664 | free_netdev(pshm_dev->pshm_netdev); |
| 665 | return -ENOMEM; |
| 666 | } |
| 667 | rx_buf->index = j; |
| 668 | rx_buf->phy_addr = pshm_drv->shm_rx_addr + (RX_BUF_SZ * j); |
| 669 | rx_buf->len = RX_BUF_SZ; |
| 670 | |
| 671 | if (pshm_dev->shm_loopback) |
sjur.brandeland@stericsson.com | 095d2a7 | 2011-12-06 12:15:43 +0000 | [diff] [blame] | 672 | rx_buf->desc_vptr = (unsigned char *)rx_buf->phy_addr; |
sjur.brandeland@stericsson.com | dfae55d | 2010-10-27 08:34:40 +0000 | [diff] [blame] | 673 | else |
| 674 | rx_buf->desc_vptr = |
| 675 | ioremap(rx_buf->phy_addr, RX_BUF_SZ); |
| 676 | list_add_tail(&rx_buf->list, &pshm_drv->rx_empty_list); |
| 677 | } |
| 678 | |
| 679 | pshm_drv->tx_empty_available = 1; |
| 680 | result = register_netdev(pshm_dev->pshm_netdev); |
| 681 | if (result) |
| 682 | pr_warn("ERROR[%d], SHM could not, " |
| 683 | "register with NW FRMWK Bailing out ...\n", result); |
| 684 | |
| 685 | return result; |
| 686 | } |
| 687 | |
| 688 | void caif_shmcore_remove(struct net_device *pshm_netdev) |
| 689 | { |
| 690 | struct buf_list *pbuf; |
| 691 | struct shmdrv_layer *pshm_drv = NULL; |
| 692 | |
| 693 | pshm_drv = netdev_priv(pshm_netdev); |
| 694 | |
| 695 | while (!(list_empty(&pshm_drv->tx_pend_list))) { |
| 696 | pbuf = |
| 697 | list_entry(pshm_drv->tx_pend_list.next, |
| 698 | struct buf_list, list); |
| 699 | |
| 700 | list_del(&pbuf->list); |
| 701 | kfree(pbuf); |
| 702 | } |
| 703 | |
| 704 | while (!(list_empty(&pshm_drv->tx_full_list))) { |
| 705 | pbuf = |
| 706 | list_entry(pshm_drv->tx_full_list.next, |
| 707 | struct buf_list, list); |
| 708 | list_del(&pbuf->list); |
| 709 | kfree(pbuf); |
| 710 | } |
| 711 | |
| 712 | while (!(list_empty(&pshm_drv->tx_empty_list))) { |
| 713 | pbuf = |
| 714 | list_entry(pshm_drv->tx_empty_list.next, |
| 715 | struct buf_list, list); |
| 716 | list_del(&pbuf->list); |
| 717 | kfree(pbuf); |
| 718 | } |
| 719 | |
| 720 | while (!(list_empty(&pshm_drv->rx_full_list))) { |
| 721 | pbuf = |
| 722 | list_entry(pshm_drv->tx_full_list.next, |
| 723 | struct buf_list, list); |
| 724 | list_del(&pbuf->list); |
| 725 | kfree(pbuf); |
| 726 | } |
| 727 | |
| 728 | while (!(list_empty(&pshm_drv->rx_pend_list))) { |
| 729 | pbuf = |
| 730 | list_entry(pshm_drv->tx_pend_list.next, |
| 731 | struct buf_list, list); |
| 732 | list_del(&pbuf->list); |
| 733 | kfree(pbuf); |
| 734 | } |
| 735 | |
| 736 | while (!(list_empty(&pshm_drv->rx_empty_list))) { |
| 737 | pbuf = |
| 738 | list_entry(pshm_drv->rx_empty_list.next, |
| 739 | struct buf_list, list); |
| 740 | list_del(&pbuf->list); |
| 741 | kfree(pbuf); |
| 742 | } |
| 743 | |
| 744 | /* Destroy work queues. */ |
| 745 | destroy_workqueue(pshm_drv->pshm_tx_workqueue); |
| 746 | destroy_workqueue(pshm_drv->pshm_rx_workqueue); |
| 747 | |
| 748 | unregister_netdev(pshm_netdev); |
| 749 | } |