Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) ST-Ericsson AB 2010 |
| 3 | * Contact: Sjur Brendeland / sjur.brandeland@stericsson.com |
| 4 | * Author: Daniel Martensson / daniel.martensson@stericsson.com |
| 5 | * Dmitry.Tarnyagin / dmitry.tarnyagin@stericsson.com |
| 6 | * License terms: GNU General Public License (GPL) version 2. |
| 7 | */ |
| 8 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 9 | #include <linux/init.h> |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/device.h> |
| 12 | #include <linux/platform_device.h> |
| 13 | #include <linux/netdevice.h> |
| 14 | #include <linux/string.h> |
| 15 | #include <linux/list.h> |
| 16 | #include <linux/interrupt.h> |
| 17 | #include <linux/delay.h> |
| 18 | #include <linux/sched.h> |
| 19 | #include <linux/if_arp.h> |
| 20 | #include <linux/timer.h> |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame^] | 21 | #include <linux/rtnetlink.h> |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 22 | #include <net/caif/caif_layer.h> |
| 23 | #include <net/caif/caif_hsi.h> |
| 24 | |
| 25 | MODULE_LICENSE("GPL"); |
| 26 | MODULE_AUTHOR("Daniel Martensson<daniel.martensson@stericsson.com>"); |
| 27 | MODULE_DESCRIPTION("CAIF HSI driver"); |
| 28 | |
| 29 | /* Returns the number of padding bytes for alignment. */ |
| 30 | #define PAD_POW2(x, pow) ((((x)&((pow)-1)) == 0) ? 0 :\ |
| 31 | (((pow)-((x)&((pow)-1))))) |
| 32 | |
Dmitry Tarnyagin | 28bd204 | 2011-10-13 11:29:27 +0000 | [diff] [blame] | 33 | static int inactivity_timeout = 1000; |
| 34 | module_param(inactivity_timeout, int, S_IRUGO | S_IWUSR); |
| 35 | MODULE_PARM_DESC(inactivity_timeout, "Inactivity timeout on HSI, ms."); |
| 36 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 37 | /* |
| 38 | * HSI padding options. |
| 39 | * Warning: must be a base of 2 (& operation used) and can not be zero ! |
| 40 | */ |
| 41 | static int hsi_head_align = 4; |
| 42 | module_param(hsi_head_align, int, S_IRUGO); |
| 43 | MODULE_PARM_DESC(hsi_head_align, "HSI head alignment."); |
| 44 | |
| 45 | static int hsi_tail_align = 4; |
| 46 | module_param(hsi_tail_align, int, S_IRUGO); |
| 47 | MODULE_PARM_DESC(hsi_tail_align, "HSI tail alignment."); |
| 48 | |
| 49 | /* |
| 50 | * HSI link layer flowcontrol thresholds. |
| 51 | * Warning: A high threshold value migth increase throughput but it will at |
| 52 | * the same time prevent channel prioritization and increase the risk of |
| 53 | * flooding the modem. The high threshold should be above the low. |
| 54 | */ |
| 55 | static int hsi_high_threshold = 100; |
| 56 | module_param(hsi_high_threshold, int, S_IRUGO); |
| 57 | MODULE_PARM_DESC(hsi_high_threshold, "HSI high threshold (FLOW OFF)."); |
| 58 | |
| 59 | static int hsi_low_threshold = 50; |
| 60 | module_param(hsi_low_threshold, int, S_IRUGO); |
| 61 | MODULE_PARM_DESC(hsi_low_threshold, "HSI high threshold (FLOW ON)."); |
| 62 | |
| 63 | #define ON 1 |
| 64 | #define OFF 0 |
| 65 | |
| 66 | /* |
| 67 | * Threshold values for the HSI packet queue. Flowcontrol will be asserted |
| 68 | * when the number of packets exceeds HIGH_WATER_MARK. It will not be |
| 69 | * de-asserted before the number of packets drops below LOW_WATER_MARK. |
| 70 | */ |
| 71 | #define LOW_WATER_MARK hsi_low_threshold |
| 72 | #define HIGH_WATER_MARK hsi_high_threshold |
| 73 | |
| 74 | static LIST_HEAD(cfhsi_list); |
| 75 | static spinlock_t cfhsi_list_lock; |
| 76 | |
| 77 | static void cfhsi_inactivity_tout(unsigned long arg) |
| 78 | { |
| 79 | struct cfhsi *cfhsi = (struct cfhsi *)arg; |
| 80 | |
| 81 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", |
| 82 | __func__); |
| 83 | |
| 84 | /* Schedule power down work queue. */ |
| 85 | if (!test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) |
| 86 | queue_work(cfhsi->wq, &cfhsi->wake_down_work); |
| 87 | } |
| 88 | |
| 89 | static void cfhsi_abort_tx(struct cfhsi *cfhsi) |
| 90 | { |
| 91 | struct sk_buff *skb; |
| 92 | |
| 93 | for (;;) { |
| 94 | spin_lock_bh(&cfhsi->lock); |
| 95 | skb = skb_dequeue(&cfhsi->qhead); |
| 96 | if (!skb) |
| 97 | break; |
| 98 | |
| 99 | cfhsi->ndev->stats.tx_errors++; |
| 100 | cfhsi->ndev->stats.tx_dropped++; |
| 101 | spin_unlock_bh(&cfhsi->lock); |
| 102 | kfree_skb(skb); |
| 103 | } |
| 104 | cfhsi->tx_state = CFHSI_TX_STATE_IDLE; |
| 105 | if (!test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) |
Dmitry Tarnyagin | 28bd204 | 2011-10-13 11:29:27 +0000 | [diff] [blame] | 106 | mod_timer(&cfhsi->timer, |
| 107 | jiffies + cfhsi->inactivity_timeout); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 108 | spin_unlock_bh(&cfhsi->lock); |
| 109 | } |
| 110 | |
| 111 | static int cfhsi_flush_fifo(struct cfhsi *cfhsi) |
| 112 | { |
| 113 | char buffer[32]; /* Any reasonable value */ |
| 114 | size_t fifo_occupancy; |
| 115 | int ret; |
| 116 | |
| 117 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", |
| 118 | __func__); |
| 119 | |
| 120 | |
| 121 | ret = cfhsi->dev->cfhsi_wake_up(cfhsi->dev); |
| 122 | if (ret) { |
| 123 | dev_warn(&cfhsi->ndev->dev, |
| 124 | "%s: can't wake up HSI interface: %d.\n", |
| 125 | __func__, ret); |
| 126 | return ret; |
| 127 | } |
| 128 | |
| 129 | do { |
| 130 | ret = cfhsi->dev->cfhsi_fifo_occupancy(cfhsi->dev, |
| 131 | &fifo_occupancy); |
| 132 | if (ret) { |
| 133 | dev_warn(&cfhsi->ndev->dev, |
| 134 | "%s: can't get FIFO occupancy: %d.\n", |
| 135 | __func__, ret); |
| 136 | break; |
| 137 | } else if (!fifo_occupancy) |
| 138 | /* No more data, exitting normally */ |
| 139 | break; |
| 140 | |
| 141 | fifo_occupancy = min(sizeof(buffer), fifo_occupancy); |
| 142 | set_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits); |
| 143 | ret = cfhsi->dev->cfhsi_rx(buffer, fifo_occupancy, |
| 144 | cfhsi->dev); |
| 145 | if (ret) { |
| 146 | clear_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits); |
| 147 | dev_warn(&cfhsi->ndev->dev, |
| 148 | "%s: can't read data: %d.\n", |
| 149 | __func__, ret); |
| 150 | break; |
| 151 | } |
| 152 | |
| 153 | ret = 5 * HZ; |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 154 | ret = wait_event_interruptible_timeout(cfhsi->flush_fifo_wait, |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 155 | !test_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits), ret); |
| 156 | |
| 157 | if (ret < 0) { |
| 158 | dev_warn(&cfhsi->ndev->dev, |
| 159 | "%s: can't wait for flush complete: %d.\n", |
| 160 | __func__, ret); |
| 161 | break; |
| 162 | } else if (!ret) { |
| 163 | ret = -ETIMEDOUT; |
| 164 | dev_warn(&cfhsi->ndev->dev, |
| 165 | "%s: timeout waiting for flush complete.\n", |
| 166 | __func__); |
| 167 | break; |
| 168 | } |
| 169 | } while (1); |
| 170 | |
| 171 | cfhsi->dev->cfhsi_wake_down(cfhsi->dev); |
| 172 | |
| 173 | return ret; |
| 174 | } |
| 175 | |
| 176 | static int cfhsi_tx_frm(struct cfhsi_desc *desc, struct cfhsi *cfhsi) |
| 177 | { |
| 178 | int nfrms = 0; |
| 179 | int pld_len = 0; |
| 180 | struct sk_buff *skb; |
| 181 | u8 *pfrm = desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ; |
| 182 | |
| 183 | skb = skb_dequeue(&cfhsi->qhead); |
| 184 | if (!skb) |
| 185 | return 0; |
| 186 | |
sjur.brandeland@stericsson.com | 94230fe | 2011-10-13 11:29:22 +0000 | [diff] [blame] | 187 | /* Clear offset. */ |
| 188 | desc->offset = 0; |
| 189 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 190 | /* Check if we can embed a CAIF frame. */ |
| 191 | if (skb->len < CFHSI_MAX_EMB_FRM_SZ) { |
| 192 | struct caif_payload_info *info; |
| 193 | int hpad = 0; |
| 194 | int tpad = 0; |
| 195 | |
| 196 | /* Calculate needed head alignment and tail alignment. */ |
| 197 | info = (struct caif_payload_info *)&skb->cb; |
| 198 | |
| 199 | hpad = 1 + PAD_POW2((info->hdr_len + 1), hsi_head_align); |
| 200 | tpad = PAD_POW2((skb->len + hpad), hsi_tail_align); |
| 201 | |
| 202 | /* Check if frame still fits with added alignment. */ |
| 203 | if ((skb->len + hpad + tpad) <= CFHSI_MAX_EMB_FRM_SZ) { |
| 204 | u8 *pemb = desc->emb_frm; |
| 205 | desc->offset = CFHSI_DESC_SHORT_SZ; |
| 206 | *pemb = (u8)(hpad - 1); |
| 207 | pemb += hpad; |
| 208 | |
| 209 | /* Update network statistics. */ |
| 210 | cfhsi->ndev->stats.tx_packets++; |
| 211 | cfhsi->ndev->stats.tx_bytes += skb->len; |
| 212 | |
| 213 | /* Copy in embedded CAIF frame. */ |
| 214 | skb_copy_bits(skb, 0, pemb, skb->len); |
| 215 | consume_skb(skb); |
| 216 | skb = NULL; |
| 217 | } |
sjur.brandeland@stericsson.com | 94230fe | 2011-10-13 11:29:22 +0000 | [diff] [blame] | 218 | } |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 219 | |
| 220 | /* Create payload CAIF frames. */ |
| 221 | pfrm = desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ; |
| 222 | while (nfrms < CFHSI_MAX_PKTS) { |
| 223 | struct caif_payload_info *info; |
| 224 | int hpad = 0; |
| 225 | int tpad = 0; |
| 226 | |
| 227 | if (!skb) |
| 228 | skb = skb_dequeue(&cfhsi->qhead); |
| 229 | |
| 230 | if (!skb) |
| 231 | break; |
| 232 | |
| 233 | /* Calculate needed head alignment and tail alignment. */ |
| 234 | info = (struct caif_payload_info *)&skb->cb; |
| 235 | |
| 236 | hpad = 1 + PAD_POW2((info->hdr_len + 1), hsi_head_align); |
| 237 | tpad = PAD_POW2((skb->len + hpad), hsi_tail_align); |
| 238 | |
| 239 | /* Fill in CAIF frame length in descriptor. */ |
| 240 | desc->cffrm_len[nfrms] = hpad + skb->len + tpad; |
| 241 | |
| 242 | /* Fill head padding information. */ |
| 243 | *pfrm = (u8)(hpad - 1); |
| 244 | pfrm += hpad; |
| 245 | |
| 246 | /* Update network statistics. */ |
| 247 | cfhsi->ndev->stats.tx_packets++; |
| 248 | cfhsi->ndev->stats.tx_bytes += skb->len; |
| 249 | |
| 250 | /* Copy in CAIF frame. */ |
| 251 | skb_copy_bits(skb, 0, pfrm, skb->len); |
| 252 | |
| 253 | /* Update payload length. */ |
| 254 | pld_len += desc->cffrm_len[nfrms]; |
| 255 | |
| 256 | /* Update frame pointer. */ |
| 257 | pfrm += skb->len + tpad; |
| 258 | consume_skb(skb); |
| 259 | skb = NULL; |
| 260 | |
| 261 | /* Update number of frames. */ |
| 262 | nfrms++; |
| 263 | } |
| 264 | |
| 265 | /* Unused length fields should be zero-filled (according to SPEC). */ |
| 266 | while (nfrms < CFHSI_MAX_PKTS) { |
| 267 | desc->cffrm_len[nfrms] = 0x0000; |
| 268 | nfrms++; |
| 269 | } |
| 270 | |
| 271 | /* Check if we can piggy-back another descriptor. */ |
| 272 | skb = skb_peek(&cfhsi->qhead); |
| 273 | if (skb) |
| 274 | desc->header |= CFHSI_PIGGY_DESC; |
| 275 | else |
| 276 | desc->header &= ~CFHSI_PIGGY_DESC; |
| 277 | |
| 278 | return CFHSI_DESC_SZ + pld_len; |
| 279 | } |
| 280 | |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 281 | static void cfhsi_tx_done(struct cfhsi *cfhsi) |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 282 | { |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 283 | struct cfhsi_desc *desc = NULL; |
| 284 | int len = 0; |
| 285 | int res; |
| 286 | |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 287 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", __func__); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 288 | |
| 289 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) |
| 290 | return; |
| 291 | |
| 292 | desc = (struct cfhsi_desc *)cfhsi->tx_buf; |
| 293 | |
| 294 | do { |
| 295 | /* |
| 296 | * Send flow on if flow off has been previously signalled |
| 297 | * and number of packets is below low water mark. |
| 298 | */ |
| 299 | spin_lock_bh(&cfhsi->lock); |
| 300 | if (cfhsi->flow_off_sent && |
| 301 | cfhsi->qhead.qlen <= cfhsi->q_low_mark && |
| 302 | cfhsi->cfdev.flowctrl) { |
| 303 | |
| 304 | cfhsi->flow_off_sent = 0; |
| 305 | cfhsi->cfdev.flowctrl(cfhsi->ndev, ON); |
| 306 | } |
| 307 | spin_unlock_bh(&cfhsi->lock); |
| 308 | |
| 309 | /* Create HSI frame. */ |
Dmitry Tarnyagin | fe47f12 | 2011-10-13 11:29:23 +0000 | [diff] [blame] | 310 | do { |
| 311 | len = cfhsi_tx_frm(desc, cfhsi); |
| 312 | if (!len) { |
| 313 | spin_lock_bh(&cfhsi->lock); |
| 314 | if (unlikely(skb_peek(&cfhsi->qhead))) { |
| 315 | spin_unlock_bh(&cfhsi->lock); |
| 316 | continue; |
| 317 | } |
| 318 | cfhsi->tx_state = CFHSI_TX_STATE_IDLE; |
| 319 | /* Start inactivity timer. */ |
| 320 | mod_timer(&cfhsi->timer, |
Dmitry Tarnyagin | 28bd204 | 2011-10-13 11:29:27 +0000 | [diff] [blame] | 321 | jiffies + cfhsi->inactivity_timeout); |
Dmitry Tarnyagin | fe47f12 | 2011-10-13 11:29:23 +0000 | [diff] [blame] | 322 | spin_unlock_bh(&cfhsi->lock); |
| 323 | goto done; |
| 324 | } |
| 325 | } while (!len); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 326 | |
| 327 | /* Set up new transfer. */ |
| 328 | res = cfhsi->dev->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->dev); |
| 329 | if (WARN_ON(res < 0)) { |
| 330 | dev_err(&cfhsi->ndev->dev, "%s: TX error %d.\n", |
| 331 | __func__, res); |
| 332 | } |
| 333 | } while (res < 0); |
Dmitry Tarnyagin | fe47f12 | 2011-10-13 11:29:23 +0000 | [diff] [blame] | 334 | |
| 335 | done: |
| 336 | return; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 337 | } |
| 338 | |
| 339 | static void cfhsi_tx_done_cb(struct cfhsi_drv *drv) |
| 340 | { |
| 341 | struct cfhsi *cfhsi; |
| 342 | |
| 343 | cfhsi = container_of(drv, struct cfhsi, drv); |
| 344 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", |
| 345 | __func__); |
| 346 | |
| 347 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) |
| 348 | return; |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 349 | cfhsi_tx_done(cfhsi); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 350 | } |
| 351 | |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame^] | 352 | static int cfhsi_rx_desc(struct cfhsi_desc *desc, struct cfhsi *cfhsi) |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 353 | { |
| 354 | int xfer_sz = 0; |
| 355 | int nfrms = 0; |
| 356 | u16 *plen = NULL; |
| 357 | u8 *pfrm = NULL; |
| 358 | |
| 359 | if ((desc->header & ~CFHSI_PIGGY_DESC) || |
| 360 | (desc->offset > CFHSI_MAX_EMB_FRM_SZ)) { |
| 361 | dev_err(&cfhsi->ndev->dev, "%s: Invalid descriptor.\n", |
| 362 | __func__); |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame^] | 363 | return -EPROTO; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 364 | } |
| 365 | |
| 366 | /* Check for embedded CAIF frame. */ |
| 367 | if (desc->offset) { |
| 368 | struct sk_buff *skb; |
| 369 | u8 *dst = NULL; |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 370 | int len = 0; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 371 | pfrm = ((u8 *)desc) + desc->offset; |
| 372 | |
| 373 | /* Remove offset padding. */ |
| 374 | pfrm += *pfrm + 1; |
| 375 | |
| 376 | /* Read length of CAIF frame (little endian). */ |
| 377 | len = *pfrm; |
| 378 | len |= ((*(pfrm+1)) << 8) & 0xFF00; |
| 379 | len += 2; /* Add FCS fields. */ |
| 380 | |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame^] | 381 | /* Sanity check length of CAIF frame. */ |
| 382 | if (unlikely(len > CFHSI_MAX_CAIF_FRAME_SZ)) { |
| 383 | dev_err(&cfhsi->ndev->dev, "%s: Invalid length.\n", |
| 384 | __func__); |
| 385 | return -EPROTO; |
| 386 | } |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 387 | |
| 388 | /* Allocate SKB (OK even in IRQ context). */ |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 389 | skb = alloc_skb(len + 1, GFP_ATOMIC); |
| 390 | if (!skb) { |
| 391 | dev_err(&cfhsi->ndev->dev, "%s: Out of memory !\n", |
| 392 | __func__); |
| 393 | return -ENOMEM; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 394 | } |
| 395 | caif_assert(skb != NULL); |
| 396 | |
| 397 | dst = skb_put(skb, len); |
| 398 | memcpy(dst, pfrm, len); |
| 399 | |
| 400 | skb->protocol = htons(ETH_P_CAIF); |
| 401 | skb_reset_mac_header(skb); |
| 402 | skb->dev = cfhsi->ndev; |
| 403 | |
| 404 | /* |
| 405 | * We are called from a arch specific platform device. |
| 406 | * Unfortunately we don't know what context we're |
| 407 | * running in. |
| 408 | */ |
| 409 | if (in_interrupt()) |
| 410 | netif_rx(skb); |
| 411 | else |
| 412 | netif_rx_ni(skb); |
| 413 | |
| 414 | /* Update network statistics. */ |
| 415 | cfhsi->ndev->stats.rx_packets++; |
| 416 | cfhsi->ndev->stats.rx_bytes += len; |
| 417 | } |
| 418 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 419 | /* Calculate transfer length. */ |
| 420 | plen = desc->cffrm_len; |
| 421 | while (nfrms < CFHSI_MAX_PKTS && *plen) { |
| 422 | xfer_sz += *plen; |
| 423 | plen++; |
| 424 | nfrms++; |
| 425 | } |
| 426 | |
| 427 | /* Check for piggy-backed descriptor. */ |
| 428 | if (desc->header & CFHSI_PIGGY_DESC) |
| 429 | xfer_sz += CFHSI_DESC_SZ; |
| 430 | |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame^] | 431 | if ((xfer_sz % 4) || (xfer_sz > (CFHSI_BUF_SZ_RX - CFHSI_DESC_SZ))) { |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 432 | dev_err(&cfhsi->ndev->dev, |
| 433 | "%s: Invalid payload len: %d, ignored.\n", |
| 434 | __func__, xfer_sz); |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame^] | 435 | return -EPROTO; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 436 | } |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 437 | return xfer_sz; |
| 438 | } |
| 439 | |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame^] | 440 | static int cfhsi_rx_pld(struct cfhsi_desc *desc, struct cfhsi *cfhsi) |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 441 | { |
| 442 | int rx_sz = 0; |
| 443 | int nfrms = 0; |
| 444 | u16 *plen = NULL; |
| 445 | u8 *pfrm = NULL; |
| 446 | |
| 447 | /* Sanity check header and offset. */ |
| 448 | if (WARN_ON((desc->header & ~CFHSI_PIGGY_DESC) || |
| 449 | (desc->offset > CFHSI_MAX_EMB_FRM_SZ))) { |
| 450 | dev_err(&cfhsi->ndev->dev, "%s: Invalid descriptor.\n", |
| 451 | __func__); |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame^] | 452 | return -EPROTO; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 453 | } |
| 454 | |
| 455 | /* Set frame pointer to start of payload. */ |
| 456 | pfrm = desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ; |
| 457 | plen = desc->cffrm_len; |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 458 | |
| 459 | /* Skip already processed frames. */ |
| 460 | while (nfrms < cfhsi->rx_state.nfrms) { |
| 461 | pfrm += *plen; |
| 462 | rx_sz += *plen; |
| 463 | plen++; |
| 464 | nfrms++; |
| 465 | } |
| 466 | |
| 467 | /* Parse payload. */ |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 468 | while (nfrms < CFHSI_MAX_PKTS && *plen) { |
| 469 | struct sk_buff *skb; |
| 470 | u8 *dst = NULL; |
| 471 | u8 *pcffrm = NULL; |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 472 | int len = 0; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 473 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 474 | /* CAIF frame starts after head padding. */ |
| 475 | pcffrm = pfrm + *pfrm + 1; |
| 476 | |
| 477 | /* Read length of CAIF frame (little endian). */ |
| 478 | len = *pcffrm; |
| 479 | len |= ((*(pcffrm + 1)) << 8) & 0xFF00; |
| 480 | len += 2; /* Add FCS fields. */ |
| 481 | |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame^] | 482 | /* Sanity check length of CAIF frames. */ |
| 483 | if (unlikely(len > CFHSI_MAX_CAIF_FRAME_SZ)) { |
| 484 | dev_err(&cfhsi->ndev->dev, "%s: Invalid length.\n", |
| 485 | __func__); |
| 486 | return -EPROTO; |
| 487 | } |
| 488 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 489 | /* Allocate SKB (OK even in IRQ context). */ |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 490 | skb = alloc_skb(len + 1, GFP_ATOMIC); |
| 491 | if (!skb) { |
| 492 | dev_err(&cfhsi->ndev->dev, "%s: Out of memory !\n", |
| 493 | __func__); |
| 494 | cfhsi->rx_state.nfrms = nfrms; |
| 495 | return -ENOMEM; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 496 | } |
| 497 | caif_assert(skb != NULL); |
| 498 | |
| 499 | dst = skb_put(skb, len); |
| 500 | memcpy(dst, pcffrm, len); |
| 501 | |
| 502 | skb->protocol = htons(ETH_P_CAIF); |
| 503 | skb_reset_mac_header(skb); |
| 504 | skb->dev = cfhsi->ndev; |
| 505 | |
| 506 | /* |
| 507 | * We're called from a platform device, |
| 508 | * and don't know the context we're running in. |
| 509 | */ |
| 510 | if (in_interrupt()) |
| 511 | netif_rx(skb); |
| 512 | else |
| 513 | netif_rx_ni(skb); |
| 514 | |
| 515 | /* Update network statistics. */ |
| 516 | cfhsi->ndev->stats.rx_packets++; |
| 517 | cfhsi->ndev->stats.rx_bytes += len; |
| 518 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 519 | pfrm += *plen; |
| 520 | rx_sz += *plen; |
| 521 | plen++; |
| 522 | nfrms++; |
| 523 | } |
| 524 | |
| 525 | return rx_sz; |
| 526 | } |
| 527 | |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 528 | static void cfhsi_rx_done(struct cfhsi *cfhsi) |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 529 | { |
| 530 | int res; |
| 531 | int desc_pld_len = 0; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 532 | struct cfhsi_desc *desc = NULL; |
| 533 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 534 | desc = (struct cfhsi_desc *)cfhsi->rx_buf; |
| 535 | |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 536 | dev_dbg(&cfhsi->ndev->dev, "%s\n", __func__); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 537 | |
| 538 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) |
| 539 | return; |
| 540 | |
| 541 | /* Update inactivity timer if pending. */ |
Dmitry Tarnyagin | 73033c9 | 2011-10-13 11:29:24 +0000 | [diff] [blame] | 542 | spin_lock_bh(&cfhsi->lock); |
Dmitry Tarnyagin | 28bd204 | 2011-10-13 11:29:27 +0000 | [diff] [blame] | 543 | mod_timer_pending(&cfhsi->timer, |
| 544 | jiffies + cfhsi->inactivity_timeout); |
Dmitry Tarnyagin | 73033c9 | 2011-10-13 11:29:24 +0000 | [diff] [blame] | 545 | spin_unlock_bh(&cfhsi->lock); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 546 | |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 547 | if (cfhsi->rx_state.state == CFHSI_RX_STATE_DESC) { |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame^] | 548 | desc_pld_len = cfhsi_rx_desc(desc, cfhsi); |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 549 | if (desc_pld_len == -ENOMEM) |
| 550 | goto restart; |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame^] | 551 | if (desc_pld_len == -EPROTO) |
| 552 | goto out_of_sync; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 553 | } else { |
| 554 | int pld_len; |
| 555 | |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 556 | if (!cfhsi->rx_state.piggy_desc) { |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame^] | 557 | pld_len = cfhsi_rx_pld(desc, cfhsi); |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 558 | if (pld_len == -ENOMEM) |
| 559 | goto restart; |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame^] | 560 | if (pld_len == -EPROTO) |
| 561 | goto out_of_sync; |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 562 | cfhsi->rx_state.pld_len = pld_len; |
| 563 | } else { |
| 564 | pld_len = cfhsi->rx_state.pld_len; |
| 565 | } |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 566 | |
| 567 | if ((pld_len > 0) && (desc->header & CFHSI_PIGGY_DESC)) { |
| 568 | struct cfhsi_desc *piggy_desc; |
| 569 | piggy_desc = (struct cfhsi_desc *) |
| 570 | (desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ + |
| 571 | pld_len); |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 572 | cfhsi->rx_state.piggy_desc = true; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 573 | |
| 574 | /* Extract piggy-backed descriptor. */ |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame^] | 575 | desc_pld_len = cfhsi_rx_desc(piggy_desc, cfhsi); |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 576 | if (desc_pld_len == -ENOMEM) |
| 577 | goto restart; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 578 | |
| 579 | /* |
| 580 | * Copy needed information from the piggy-backed |
| 581 | * descriptor to the descriptor in the start. |
| 582 | */ |
| 583 | memcpy((u8 *)desc, (u8 *)piggy_desc, |
| 584 | CFHSI_DESC_SHORT_SZ); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 585 | |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame^] | 586 | if (desc_pld_len == -EPROTO) |
| 587 | goto out_of_sync; |
| 588 | } |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 589 | } |
| 590 | |
| 591 | memset(&cfhsi->rx_state, 0, sizeof(cfhsi->rx_state)); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 592 | if (desc_pld_len) { |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 593 | cfhsi->rx_state.state = CFHSI_RX_STATE_PAYLOAD; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 594 | cfhsi->rx_ptr = cfhsi->rx_buf + CFHSI_DESC_SZ; |
| 595 | cfhsi->rx_len = desc_pld_len; |
| 596 | } else { |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 597 | cfhsi->rx_state.state = CFHSI_RX_STATE_DESC; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 598 | cfhsi->rx_ptr = cfhsi->rx_buf; |
| 599 | cfhsi->rx_len = CFHSI_DESC_SZ; |
| 600 | } |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 601 | |
| 602 | if (test_bit(CFHSI_AWAKE, &cfhsi->bits)) { |
| 603 | /* Set up new transfer. */ |
| 604 | dev_dbg(&cfhsi->ndev->dev, "%s: Start RX.\n", |
| 605 | __func__); |
| 606 | res = cfhsi->dev->cfhsi_rx(cfhsi->rx_ptr, cfhsi->rx_len, |
| 607 | cfhsi->dev); |
| 608 | if (WARN_ON(res < 0)) { |
| 609 | dev_err(&cfhsi->ndev->dev, "%s: RX error %d.\n", |
| 610 | __func__, res); |
| 611 | cfhsi->ndev->stats.rx_errors++; |
| 612 | cfhsi->ndev->stats.rx_dropped++; |
| 613 | } |
| 614 | } |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 615 | return; |
| 616 | |
| 617 | restart: |
| 618 | if (++cfhsi->rx_state.retries > CFHSI_MAX_RX_RETRIES) { |
| 619 | dev_err(&cfhsi->ndev->dev, "%s: No memory available " |
| 620 | "in %d iterations.\n", |
| 621 | __func__, CFHSI_MAX_RX_RETRIES); |
| 622 | BUG(); |
| 623 | } |
| 624 | mod_timer(&cfhsi->rx_slowpath_timer, jiffies + 1); |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame^] | 625 | return; |
| 626 | |
| 627 | out_of_sync: |
| 628 | dev_err(&cfhsi->ndev->dev, "%s: Out of sync.\n", __func__); |
| 629 | print_hex_dump_bytes("--> ", DUMP_PREFIX_NONE, |
| 630 | cfhsi->rx_buf, CFHSI_DESC_SZ); |
| 631 | schedule_work(&cfhsi->out_of_sync_work); |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 632 | } |
| 633 | |
| 634 | static void cfhsi_rx_slowpath(unsigned long arg) |
| 635 | { |
| 636 | struct cfhsi *cfhsi = (struct cfhsi *)arg; |
| 637 | |
| 638 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", |
| 639 | __func__); |
| 640 | |
| 641 | cfhsi_rx_done(cfhsi); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 642 | } |
| 643 | |
| 644 | static void cfhsi_rx_done_cb(struct cfhsi_drv *drv) |
| 645 | { |
| 646 | struct cfhsi *cfhsi; |
| 647 | |
| 648 | cfhsi = container_of(drv, struct cfhsi, drv); |
| 649 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", |
| 650 | __func__); |
| 651 | |
| 652 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) |
| 653 | return; |
| 654 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 655 | if (test_and_clear_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits)) |
| 656 | wake_up_interruptible(&cfhsi->flush_fifo_wait); |
| 657 | else |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 658 | cfhsi_rx_done(cfhsi); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 659 | } |
| 660 | |
| 661 | static void cfhsi_wake_up(struct work_struct *work) |
| 662 | { |
| 663 | struct cfhsi *cfhsi = NULL; |
| 664 | int res; |
| 665 | int len; |
| 666 | long ret; |
| 667 | |
| 668 | cfhsi = container_of(work, struct cfhsi, wake_up_work); |
| 669 | |
| 670 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) |
| 671 | return; |
| 672 | |
| 673 | if (unlikely(test_bit(CFHSI_AWAKE, &cfhsi->bits))) { |
| 674 | /* It happenes when wakeup is requested by |
| 675 | * both ends at the same time. */ |
| 676 | clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); |
| 677 | return; |
| 678 | } |
| 679 | |
| 680 | /* Activate wake line. */ |
| 681 | cfhsi->dev->cfhsi_wake_up(cfhsi->dev); |
| 682 | |
| 683 | dev_dbg(&cfhsi->ndev->dev, "%s: Start waiting.\n", |
| 684 | __func__); |
| 685 | |
| 686 | /* Wait for acknowledge. */ |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 687 | ret = CFHSI_WAKE_TOUT; |
| 688 | ret = wait_event_interruptible_timeout(cfhsi->wake_up_wait, |
| 689 | test_and_clear_bit(CFHSI_WAKE_UP_ACK, |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 690 | &cfhsi->bits), ret); |
| 691 | if (unlikely(ret < 0)) { |
| 692 | /* Interrupted by signal. */ |
| 693 | dev_info(&cfhsi->ndev->dev, "%s: Signalled: %ld.\n", |
| 694 | __func__, ret); |
| 695 | clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); |
| 696 | cfhsi->dev->cfhsi_wake_down(cfhsi->dev); |
| 697 | return; |
| 698 | } else if (!ret) { |
| 699 | /* Wakeup timeout */ |
| 700 | dev_err(&cfhsi->ndev->dev, "%s: Timeout.\n", |
| 701 | __func__); |
| 702 | clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); |
| 703 | cfhsi->dev->cfhsi_wake_down(cfhsi->dev); |
| 704 | return; |
| 705 | } |
| 706 | dev_dbg(&cfhsi->ndev->dev, "%s: Woken.\n", |
| 707 | __func__); |
| 708 | |
| 709 | /* Clear power up bit. */ |
| 710 | set_bit(CFHSI_AWAKE, &cfhsi->bits); |
| 711 | clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); |
| 712 | |
| 713 | /* Resume read operation. */ |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 714 | dev_dbg(&cfhsi->ndev->dev, "%s: Start RX.\n", __func__); |
| 715 | res = cfhsi->dev->cfhsi_rx(cfhsi->rx_ptr, cfhsi->rx_len, cfhsi->dev); |
| 716 | |
| 717 | if (WARN_ON(res < 0)) |
| 718 | dev_err(&cfhsi->ndev->dev, "%s: RX err %d.\n", __func__, res); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 719 | |
| 720 | /* Clear power up acknowledment. */ |
| 721 | clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits); |
| 722 | |
| 723 | spin_lock_bh(&cfhsi->lock); |
| 724 | |
| 725 | /* Resume transmit if queue is not empty. */ |
| 726 | if (!skb_peek(&cfhsi->qhead)) { |
| 727 | dev_dbg(&cfhsi->ndev->dev, "%s: Peer wake, start timer.\n", |
| 728 | __func__); |
| 729 | /* Start inactivity timer. */ |
| 730 | mod_timer(&cfhsi->timer, |
Dmitry Tarnyagin | 28bd204 | 2011-10-13 11:29:27 +0000 | [diff] [blame] | 731 | jiffies + cfhsi->inactivity_timeout); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 732 | spin_unlock_bh(&cfhsi->lock); |
| 733 | return; |
| 734 | } |
| 735 | |
| 736 | dev_dbg(&cfhsi->ndev->dev, "%s: Host wake.\n", |
| 737 | __func__); |
| 738 | |
| 739 | spin_unlock_bh(&cfhsi->lock); |
| 740 | |
| 741 | /* Create HSI frame. */ |
| 742 | len = cfhsi_tx_frm((struct cfhsi_desc *)cfhsi->tx_buf, cfhsi); |
| 743 | |
| 744 | if (likely(len > 0)) { |
| 745 | /* Set up new transfer. */ |
| 746 | res = cfhsi->dev->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->dev); |
| 747 | if (WARN_ON(res < 0)) { |
| 748 | dev_err(&cfhsi->ndev->dev, "%s: TX error %d.\n", |
| 749 | __func__, res); |
| 750 | cfhsi_abort_tx(cfhsi); |
| 751 | } |
| 752 | } else { |
| 753 | dev_err(&cfhsi->ndev->dev, |
| 754 | "%s: Failed to create HSI frame: %d.\n", |
| 755 | __func__, len); |
| 756 | } |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 757 | } |
| 758 | |
| 759 | static void cfhsi_wake_down(struct work_struct *work) |
| 760 | { |
| 761 | long ret; |
| 762 | struct cfhsi *cfhsi = NULL; |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 763 | size_t fifo_occupancy = 0; |
| 764 | int retry = CFHSI_WAKE_TOUT; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 765 | |
| 766 | cfhsi = container_of(work, struct cfhsi, wake_down_work); |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 767 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", __func__); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 768 | |
| 769 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) |
| 770 | return; |
| 771 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 772 | /* Deactivate wake line. */ |
| 773 | cfhsi->dev->cfhsi_wake_down(cfhsi->dev); |
| 774 | |
| 775 | /* Wait for acknowledge. */ |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 776 | ret = CFHSI_WAKE_TOUT; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 777 | ret = wait_event_interruptible_timeout(cfhsi->wake_down_wait, |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 778 | test_and_clear_bit(CFHSI_WAKE_DOWN_ACK, |
| 779 | &cfhsi->bits), ret); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 780 | if (ret < 0) { |
| 781 | /* Interrupted by signal. */ |
| 782 | dev_info(&cfhsi->ndev->dev, "%s: Signalled: %ld.\n", |
| 783 | __func__, ret); |
| 784 | return; |
| 785 | } else if (!ret) { |
| 786 | /* Timeout */ |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 787 | dev_err(&cfhsi->ndev->dev, "%s: Timeout.\n", __func__); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 788 | } |
| 789 | |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 790 | /* Check FIFO occupancy. */ |
| 791 | while (retry) { |
| 792 | WARN_ON(cfhsi->dev->cfhsi_fifo_occupancy(cfhsi->dev, |
| 793 | &fifo_occupancy)); |
| 794 | |
| 795 | if (!fifo_occupancy) |
| 796 | break; |
| 797 | |
| 798 | set_current_state(TASK_INTERRUPTIBLE); |
| 799 | schedule_timeout(1); |
| 800 | retry--; |
| 801 | } |
| 802 | |
| 803 | if (!retry) |
| 804 | dev_err(&cfhsi->ndev->dev, "%s: FIFO Timeout.\n", __func__); |
| 805 | |
| 806 | /* Clear AWAKE condition. */ |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 807 | clear_bit(CFHSI_AWAKE, &cfhsi->bits); |
| 808 | |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 809 | /* Cancel pending RX requests. */ |
| 810 | cfhsi->dev->cfhsi_rx_cancel(cfhsi->dev); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 811 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 812 | } |
| 813 | |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame^] | 814 | static void cfhsi_out_of_sync(struct work_struct *work) |
| 815 | { |
| 816 | struct cfhsi *cfhsi = NULL; |
| 817 | |
| 818 | cfhsi = container_of(work, struct cfhsi, out_of_sync_work); |
| 819 | |
| 820 | rtnl_lock(); |
| 821 | dev_close(cfhsi->ndev); |
| 822 | rtnl_unlock(); |
| 823 | } |
| 824 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 825 | static void cfhsi_wake_up_cb(struct cfhsi_drv *drv) |
| 826 | { |
| 827 | struct cfhsi *cfhsi = NULL; |
| 828 | |
| 829 | cfhsi = container_of(drv, struct cfhsi, drv); |
| 830 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", |
| 831 | __func__); |
| 832 | |
| 833 | set_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits); |
| 834 | wake_up_interruptible(&cfhsi->wake_up_wait); |
| 835 | |
| 836 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) |
| 837 | return; |
| 838 | |
| 839 | /* Schedule wake up work queue if the peer initiates. */ |
| 840 | if (!test_and_set_bit(CFHSI_WAKE_UP, &cfhsi->bits)) |
| 841 | queue_work(cfhsi->wq, &cfhsi->wake_up_work); |
| 842 | } |
| 843 | |
| 844 | static void cfhsi_wake_down_cb(struct cfhsi_drv *drv) |
| 845 | { |
| 846 | struct cfhsi *cfhsi = NULL; |
| 847 | |
| 848 | cfhsi = container_of(drv, struct cfhsi, drv); |
| 849 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", |
| 850 | __func__); |
| 851 | |
| 852 | /* Initiating low power is only permitted by the host (us). */ |
| 853 | set_bit(CFHSI_WAKE_DOWN_ACK, &cfhsi->bits); |
| 854 | wake_up_interruptible(&cfhsi->wake_down_wait); |
| 855 | } |
| 856 | |
| 857 | static int cfhsi_xmit(struct sk_buff *skb, struct net_device *dev) |
| 858 | { |
| 859 | struct cfhsi *cfhsi = NULL; |
| 860 | int start_xfer = 0; |
| 861 | int timer_active; |
| 862 | |
| 863 | if (!dev) |
| 864 | return -EINVAL; |
| 865 | |
| 866 | cfhsi = netdev_priv(dev); |
| 867 | |
| 868 | spin_lock_bh(&cfhsi->lock); |
| 869 | |
| 870 | skb_queue_tail(&cfhsi->qhead, skb); |
| 871 | |
| 872 | /* Sanity check; xmit should not be called after unregister_netdev */ |
| 873 | if (WARN_ON(test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))) { |
| 874 | spin_unlock_bh(&cfhsi->lock); |
| 875 | cfhsi_abort_tx(cfhsi); |
| 876 | return -EINVAL; |
| 877 | } |
| 878 | |
| 879 | /* Send flow off if number of packets is above high water mark. */ |
| 880 | if (!cfhsi->flow_off_sent && |
| 881 | cfhsi->qhead.qlen > cfhsi->q_high_mark && |
| 882 | cfhsi->cfdev.flowctrl) { |
| 883 | cfhsi->flow_off_sent = 1; |
| 884 | cfhsi->cfdev.flowctrl(cfhsi->ndev, OFF); |
| 885 | } |
| 886 | |
| 887 | if (cfhsi->tx_state == CFHSI_TX_STATE_IDLE) { |
| 888 | cfhsi->tx_state = CFHSI_TX_STATE_XFER; |
| 889 | start_xfer = 1; |
| 890 | } |
| 891 | |
Dmitry Tarnyagin | 73033c9 | 2011-10-13 11:29:24 +0000 | [diff] [blame] | 892 | if (!start_xfer) { |
| 893 | spin_unlock_bh(&cfhsi->lock); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 894 | return 0; |
Dmitry Tarnyagin | 73033c9 | 2011-10-13 11:29:24 +0000 | [diff] [blame] | 895 | } |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 896 | |
| 897 | /* Delete inactivity timer if started. */ |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 898 | timer_active = del_timer_sync(&cfhsi->timer); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 899 | |
Dmitry Tarnyagin | 73033c9 | 2011-10-13 11:29:24 +0000 | [diff] [blame] | 900 | spin_unlock_bh(&cfhsi->lock); |
| 901 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 902 | if (timer_active) { |
| 903 | struct cfhsi_desc *desc = (struct cfhsi_desc *)cfhsi->tx_buf; |
| 904 | int len; |
| 905 | int res; |
| 906 | |
| 907 | /* Create HSI frame. */ |
| 908 | len = cfhsi_tx_frm(desc, cfhsi); |
| 909 | BUG_ON(!len); |
| 910 | |
| 911 | /* Set up new transfer. */ |
| 912 | res = cfhsi->dev->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->dev); |
| 913 | if (WARN_ON(res < 0)) { |
| 914 | dev_err(&cfhsi->ndev->dev, "%s: TX error %d.\n", |
| 915 | __func__, res); |
| 916 | cfhsi_abort_tx(cfhsi); |
| 917 | } |
| 918 | } else { |
| 919 | /* Schedule wake up work queue if the we initiate. */ |
| 920 | if (!test_and_set_bit(CFHSI_WAKE_UP, &cfhsi->bits)) |
| 921 | queue_work(cfhsi->wq, &cfhsi->wake_up_work); |
| 922 | } |
| 923 | |
| 924 | return 0; |
| 925 | } |
| 926 | |
| 927 | static int cfhsi_open(struct net_device *dev) |
| 928 | { |
| 929 | netif_wake_queue(dev); |
| 930 | |
| 931 | return 0; |
| 932 | } |
| 933 | |
| 934 | static int cfhsi_close(struct net_device *dev) |
| 935 | { |
| 936 | netif_stop_queue(dev); |
| 937 | |
| 938 | return 0; |
| 939 | } |
| 940 | |
| 941 | static const struct net_device_ops cfhsi_ops = { |
| 942 | .ndo_open = cfhsi_open, |
| 943 | .ndo_stop = cfhsi_close, |
| 944 | .ndo_start_xmit = cfhsi_xmit |
| 945 | }; |
| 946 | |
| 947 | static void cfhsi_setup(struct net_device *dev) |
| 948 | { |
| 949 | struct cfhsi *cfhsi = netdev_priv(dev); |
| 950 | dev->features = 0; |
| 951 | dev->netdev_ops = &cfhsi_ops; |
| 952 | dev->type = ARPHRD_CAIF; |
| 953 | dev->flags = IFF_POINTOPOINT | IFF_NOARP; |
| 954 | dev->mtu = CFHSI_MAX_PAYLOAD_SZ; |
| 955 | dev->tx_queue_len = 0; |
| 956 | dev->destructor = free_netdev; |
| 957 | skb_queue_head_init(&cfhsi->qhead); |
| 958 | cfhsi->cfdev.link_select = CAIF_LINK_HIGH_BANDW; |
| 959 | cfhsi->cfdev.use_frag = false; |
| 960 | cfhsi->cfdev.use_stx = false; |
| 961 | cfhsi->cfdev.use_fcs = false; |
| 962 | cfhsi->ndev = dev; |
| 963 | } |
| 964 | |
| 965 | int cfhsi_probe(struct platform_device *pdev) |
| 966 | { |
| 967 | struct cfhsi *cfhsi = NULL; |
| 968 | struct net_device *ndev; |
| 969 | struct cfhsi_dev *dev; |
| 970 | int res; |
| 971 | |
| 972 | ndev = alloc_netdev(sizeof(struct cfhsi), "cfhsi%d", cfhsi_setup); |
Joe Perches | 7ac2ed0 | 2011-08-25 13:22:24 +0000 | [diff] [blame] | 973 | if (!ndev) |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 974 | return -ENODEV; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 975 | |
| 976 | cfhsi = netdev_priv(ndev); |
| 977 | cfhsi->ndev = ndev; |
| 978 | cfhsi->pdev = pdev; |
| 979 | |
| 980 | /* Initialize state vaiables. */ |
| 981 | cfhsi->tx_state = CFHSI_TX_STATE_IDLE; |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 982 | cfhsi->rx_state.state = CFHSI_RX_STATE_DESC; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 983 | |
| 984 | /* Set flow info */ |
| 985 | cfhsi->flow_off_sent = 0; |
| 986 | cfhsi->q_low_mark = LOW_WATER_MARK; |
| 987 | cfhsi->q_high_mark = HIGH_WATER_MARK; |
| 988 | |
| 989 | /* Assign the HSI device. */ |
| 990 | dev = (struct cfhsi_dev *)pdev->dev.platform_data; |
| 991 | cfhsi->dev = dev; |
| 992 | |
| 993 | /* Assign the driver to this HSI device. */ |
| 994 | dev->drv = &cfhsi->drv; |
| 995 | |
| 996 | /* |
| 997 | * Allocate a TX buffer with the size of a HSI packet descriptors |
| 998 | * and the necessary room for CAIF payload frames. |
| 999 | */ |
| 1000 | cfhsi->tx_buf = kzalloc(CFHSI_BUF_SZ_TX, GFP_KERNEL); |
| 1001 | if (!cfhsi->tx_buf) { |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1002 | res = -ENODEV; |
| 1003 | goto err_alloc_tx; |
| 1004 | } |
| 1005 | |
| 1006 | /* |
| 1007 | * Allocate a RX buffer with the size of two HSI packet descriptors and |
| 1008 | * the necessary room for CAIF payload frames. |
| 1009 | */ |
| 1010 | cfhsi->rx_buf = kzalloc(CFHSI_BUF_SZ_RX, GFP_KERNEL); |
| 1011 | if (!cfhsi->rx_buf) { |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1012 | res = -ENODEV; |
| 1013 | goto err_alloc_rx; |
| 1014 | } |
| 1015 | |
Dmitry Tarnyagin | 28bd204 | 2011-10-13 11:29:27 +0000 | [diff] [blame] | 1016 | /* Pre-calculate inactivity timeout. */ |
| 1017 | if (inactivity_timeout != -1) { |
| 1018 | cfhsi->inactivity_timeout = |
| 1019 | inactivity_timeout * HZ / 1000; |
| 1020 | if (!cfhsi->inactivity_timeout) |
| 1021 | cfhsi->inactivity_timeout = 1; |
| 1022 | else if (cfhsi->inactivity_timeout > NEXT_TIMER_MAX_DELTA) |
| 1023 | cfhsi->inactivity_timeout = NEXT_TIMER_MAX_DELTA; |
| 1024 | } else { |
| 1025 | cfhsi->inactivity_timeout = NEXT_TIMER_MAX_DELTA; |
| 1026 | } |
| 1027 | |
| 1028 | /* Initialize recieve vaiables. */ |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1029 | cfhsi->rx_ptr = cfhsi->rx_buf; |
| 1030 | cfhsi->rx_len = CFHSI_DESC_SZ; |
| 1031 | |
| 1032 | /* Initialize spin locks. */ |
| 1033 | spin_lock_init(&cfhsi->lock); |
| 1034 | |
| 1035 | /* Set up the driver. */ |
| 1036 | cfhsi->drv.tx_done_cb = cfhsi_tx_done_cb; |
| 1037 | cfhsi->drv.rx_done_cb = cfhsi_rx_done_cb; |
sjur.brandeland@stericsson.com | 94230fe | 2011-10-13 11:29:22 +0000 | [diff] [blame] | 1038 | cfhsi->drv.wake_up_cb = cfhsi_wake_up_cb; |
| 1039 | cfhsi->drv.wake_down_cb = cfhsi_wake_down_cb; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1040 | |
| 1041 | /* Initialize the work queues. */ |
| 1042 | INIT_WORK(&cfhsi->wake_up_work, cfhsi_wake_up); |
| 1043 | INIT_WORK(&cfhsi->wake_down_work, cfhsi_wake_down); |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame^] | 1044 | INIT_WORK(&cfhsi->out_of_sync_work, cfhsi_out_of_sync); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1045 | |
| 1046 | /* Clear all bit fields. */ |
| 1047 | clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits); |
| 1048 | clear_bit(CFHSI_WAKE_DOWN_ACK, &cfhsi->bits); |
| 1049 | clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); |
| 1050 | clear_bit(CFHSI_AWAKE, &cfhsi->bits); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1051 | |
| 1052 | /* Create work thread. */ |
| 1053 | cfhsi->wq = create_singlethread_workqueue(pdev->name); |
| 1054 | if (!cfhsi->wq) { |
| 1055 | dev_err(&ndev->dev, "%s: Failed to create work queue.\n", |
| 1056 | __func__); |
| 1057 | res = -ENODEV; |
| 1058 | goto err_create_wq; |
| 1059 | } |
| 1060 | |
| 1061 | /* Initialize wait queues. */ |
| 1062 | init_waitqueue_head(&cfhsi->wake_up_wait); |
| 1063 | init_waitqueue_head(&cfhsi->wake_down_wait); |
| 1064 | init_waitqueue_head(&cfhsi->flush_fifo_wait); |
| 1065 | |
| 1066 | /* Setup the inactivity timer. */ |
| 1067 | init_timer(&cfhsi->timer); |
| 1068 | cfhsi->timer.data = (unsigned long)cfhsi; |
| 1069 | cfhsi->timer.function = cfhsi_inactivity_tout; |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 1070 | /* Setup the slowpath RX timer. */ |
| 1071 | init_timer(&cfhsi->rx_slowpath_timer); |
| 1072 | cfhsi->rx_slowpath_timer.data = (unsigned long)cfhsi; |
| 1073 | cfhsi->rx_slowpath_timer.function = cfhsi_rx_slowpath; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1074 | |
| 1075 | /* Add CAIF HSI device to list. */ |
| 1076 | spin_lock(&cfhsi_list_lock); |
| 1077 | list_add_tail(&cfhsi->list, &cfhsi_list); |
| 1078 | spin_unlock(&cfhsi_list_lock); |
| 1079 | |
| 1080 | /* Activate HSI interface. */ |
| 1081 | res = cfhsi->dev->cfhsi_up(cfhsi->dev); |
| 1082 | if (res) { |
| 1083 | dev_err(&cfhsi->ndev->dev, |
| 1084 | "%s: can't activate HSI interface: %d.\n", |
| 1085 | __func__, res); |
| 1086 | goto err_activate; |
| 1087 | } |
| 1088 | |
| 1089 | /* Flush FIFO */ |
| 1090 | res = cfhsi_flush_fifo(cfhsi); |
| 1091 | if (res) { |
| 1092 | dev_err(&ndev->dev, "%s: Can't flush FIFO: %d.\n", |
| 1093 | __func__, res); |
| 1094 | goto err_net_reg; |
| 1095 | } |
| 1096 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1097 | /* Register network device. */ |
| 1098 | res = register_netdev(ndev); |
| 1099 | if (res) { |
| 1100 | dev_err(&ndev->dev, "%s: Registration error: %d.\n", |
| 1101 | __func__, res); |
| 1102 | goto err_net_reg; |
| 1103 | } |
| 1104 | |
| 1105 | netif_stop_queue(ndev); |
| 1106 | |
| 1107 | return res; |
| 1108 | |
| 1109 | err_net_reg: |
| 1110 | cfhsi->dev->cfhsi_down(cfhsi->dev); |
| 1111 | err_activate: |
| 1112 | destroy_workqueue(cfhsi->wq); |
| 1113 | err_create_wq: |
| 1114 | kfree(cfhsi->rx_buf); |
| 1115 | err_alloc_rx: |
| 1116 | kfree(cfhsi->tx_buf); |
| 1117 | err_alloc_tx: |
| 1118 | free_netdev(ndev); |
| 1119 | |
| 1120 | return res; |
| 1121 | } |
| 1122 | |
Daniel Martensson | ca63f8c | 2011-10-13 11:29:26 +0000 | [diff] [blame] | 1123 | static void cfhsi_shutdown(struct cfhsi *cfhsi) |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1124 | { |
| 1125 | u8 *tx_buf, *rx_buf; |
| 1126 | |
| 1127 | /* Stop TXing */ |
| 1128 | netif_tx_stop_all_queues(cfhsi->ndev); |
| 1129 | |
| 1130 | /* going to shutdown driver */ |
| 1131 | set_bit(CFHSI_SHUTDOWN, &cfhsi->bits); |
| 1132 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1133 | /* Flush workqueue */ |
| 1134 | flush_workqueue(cfhsi->wq); |
| 1135 | |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 1136 | /* Delete timers if pending */ |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1137 | del_timer_sync(&cfhsi->timer); |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 1138 | del_timer_sync(&cfhsi->rx_slowpath_timer); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1139 | |
| 1140 | /* Cancel pending RX request (if any) */ |
| 1141 | cfhsi->dev->cfhsi_rx_cancel(cfhsi->dev); |
| 1142 | |
Daniel Martensson | ca63f8c | 2011-10-13 11:29:26 +0000 | [diff] [blame] | 1143 | /* Destroy workqueue */ |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1144 | destroy_workqueue(cfhsi->wq); |
| 1145 | |
| 1146 | /* Store bufferes: will be freed later. */ |
| 1147 | tx_buf = cfhsi->tx_buf; |
| 1148 | rx_buf = cfhsi->rx_buf; |
| 1149 | |
| 1150 | /* Flush transmit queues. */ |
| 1151 | cfhsi_abort_tx(cfhsi); |
| 1152 | |
| 1153 | /* Deactivate interface */ |
| 1154 | cfhsi->dev->cfhsi_down(cfhsi->dev); |
| 1155 | |
| 1156 | /* Finally unregister the network device. */ |
| 1157 | unregister_netdev(cfhsi->ndev); |
| 1158 | |
| 1159 | /* Free buffers. */ |
| 1160 | kfree(tx_buf); |
| 1161 | kfree(rx_buf); |
| 1162 | } |
| 1163 | |
| 1164 | int cfhsi_remove(struct platform_device *pdev) |
| 1165 | { |
| 1166 | struct list_head *list_node; |
| 1167 | struct list_head *n; |
| 1168 | struct cfhsi *cfhsi = NULL; |
| 1169 | struct cfhsi_dev *dev; |
| 1170 | |
| 1171 | dev = (struct cfhsi_dev *)pdev->dev.platform_data; |
| 1172 | spin_lock(&cfhsi_list_lock); |
| 1173 | list_for_each_safe(list_node, n, &cfhsi_list) { |
| 1174 | cfhsi = list_entry(list_node, struct cfhsi, list); |
| 1175 | /* Find the corresponding device. */ |
| 1176 | if (cfhsi->dev == dev) { |
| 1177 | /* Remove from list. */ |
| 1178 | list_del(list_node); |
| 1179 | spin_unlock(&cfhsi_list_lock); |
| 1180 | |
| 1181 | /* Shutdown driver. */ |
Daniel Martensson | ca63f8c | 2011-10-13 11:29:26 +0000 | [diff] [blame] | 1182 | cfhsi_shutdown(cfhsi); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1183 | |
| 1184 | return 0; |
| 1185 | } |
| 1186 | } |
| 1187 | spin_unlock(&cfhsi_list_lock); |
| 1188 | return -ENODEV; |
| 1189 | } |
| 1190 | |
| 1191 | struct platform_driver cfhsi_plat_drv = { |
| 1192 | .probe = cfhsi_probe, |
| 1193 | .remove = cfhsi_remove, |
| 1194 | .driver = { |
| 1195 | .name = "cfhsi", |
| 1196 | .owner = THIS_MODULE, |
| 1197 | }, |
| 1198 | }; |
| 1199 | |
| 1200 | static void __exit cfhsi_exit_module(void) |
| 1201 | { |
| 1202 | struct list_head *list_node; |
| 1203 | struct list_head *n; |
| 1204 | struct cfhsi *cfhsi = NULL; |
| 1205 | |
| 1206 | spin_lock(&cfhsi_list_lock); |
| 1207 | list_for_each_safe(list_node, n, &cfhsi_list) { |
| 1208 | cfhsi = list_entry(list_node, struct cfhsi, list); |
| 1209 | |
| 1210 | /* Remove from list. */ |
| 1211 | list_del(list_node); |
| 1212 | spin_unlock(&cfhsi_list_lock); |
| 1213 | |
| 1214 | /* Shutdown driver. */ |
Daniel Martensson | ca63f8c | 2011-10-13 11:29:26 +0000 | [diff] [blame] | 1215 | cfhsi_shutdown(cfhsi); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1216 | |
| 1217 | spin_lock(&cfhsi_list_lock); |
| 1218 | } |
| 1219 | spin_unlock(&cfhsi_list_lock); |
| 1220 | |
| 1221 | /* Unregister platform driver. */ |
| 1222 | platform_driver_unregister(&cfhsi_plat_drv); |
| 1223 | } |
| 1224 | |
| 1225 | static int __init cfhsi_init_module(void) |
| 1226 | { |
| 1227 | int result; |
| 1228 | |
| 1229 | /* Initialize spin lock. */ |
| 1230 | spin_lock_init(&cfhsi_list_lock); |
| 1231 | |
| 1232 | /* Register platform driver. */ |
| 1233 | result = platform_driver_register(&cfhsi_plat_drv); |
| 1234 | if (result) { |
| 1235 | printk(KERN_ERR "Could not register platform HSI driver: %d.\n", |
| 1236 | result); |
| 1237 | goto err_dev_register; |
| 1238 | } |
| 1239 | |
| 1240 | return result; |
| 1241 | |
| 1242 | err_dev_register: |
| 1243 | return result; |
| 1244 | } |
| 1245 | |
| 1246 | module_init(cfhsi_init_module); |
| 1247 | module_exit(cfhsi_exit_module); |