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 | |
sjur.brandeland@stericsson.com | 39abbae | 2012-04-12 08:27:27 +0000 | [diff] [blame] | 9 | #define pr_fmt(fmt) KBUILD_MODNAME fmt |
| 10 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 11 | #include <linux/init.h> |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/device.h> |
| 14 | #include <linux/platform_device.h> |
| 15 | #include <linux/netdevice.h> |
| 16 | #include <linux/string.h> |
| 17 | #include <linux/list.h> |
| 18 | #include <linux/interrupt.h> |
| 19 | #include <linux/delay.h> |
| 20 | #include <linux/sched.h> |
| 21 | #include <linux/if_arp.h> |
| 22 | #include <linux/timer.h> |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame] | 23 | #include <linux/rtnetlink.h> |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 24 | #include <linux/pkt_sched.h> |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 25 | #include <net/caif/caif_layer.h> |
| 26 | #include <net/caif/caif_hsi.h> |
| 27 | |
| 28 | MODULE_LICENSE("GPL"); |
| 29 | MODULE_AUTHOR("Daniel Martensson<daniel.martensson@stericsson.com>"); |
| 30 | MODULE_DESCRIPTION("CAIF HSI driver"); |
| 31 | |
| 32 | /* Returns the number of padding bytes for alignment. */ |
| 33 | #define PAD_POW2(x, pow) ((((x)&((pow)-1)) == 0) ? 0 :\ |
| 34 | (((pow)-((x)&((pow)-1))))) |
| 35 | |
Dmitry Tarnyagin | 28bd204 | 2011-10-13 11:29:27 +0000 | [diff] [blame] | 36 | static int inactivity_timeout = 1000; |
| 37 | module_param(inactivity_timeout, int, S_IRUGO | S_IWUSR); |
| 38 | MODULE_PARM_DESC(inactivity_timeout, "Inactivity timeout on HSI, ms."); |
| 39 | |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 40 | static int aggregation_timeout = 1; |
| 41 | module_param(aggregation_timeout, int, S_IRUGO | S_IWUSR); |
| 42 | MODULE_PARM_DESC(aggregation_timeout, "Aggregation timeout on HSI, ms."); |
| 43 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 44 | /* |
| 45 | * HSI padding options. |
| 46 | * Warning: must be a base of 2 (& operation used) and can not be zero ! |
| 47 | */ |
| 48 | static int hsi_head_align = 4; |
| 49 | module_param(hsi_head_align, int, S_IRUGO); |
| 50 | MODULE_PARM_DESC(hsi_head_align, "HSI head alignment."); |
| 51 | |
| 52 | static int hsi_tail_align = 4; |
| 53 | module_param(hsi_tail_align, int, S_IRUGO); |
| 54 | MODULE_PARM_DESC(hsi_tail_align, "HSI tail alignment."); |
| 55 | |
| 56 | /* |
| 57 | * HSI link layer flowcontrol thresholds. |
| 58 | * Warning: A high threshold value migth increase throughput but it will at |
| 59 | * the same time prevent channel prioritization and increase the risk of |
| 60 | * flooding the modem. The high threshold should be above the low. |
| 61 | */ |
| 62 | static int hsi_high_threshold = 100; |
| 63 | module_param(hsi_high_threshold, int, S_IRUGO); |
| 64 | MODULE_PARM_DESC(hsi_high_threshold, "HSI high threshold (FLOW OFF)."); |
| 65 | |
| 66 | static int hsi_low_threshold = 50; |
| 67 | module_param(hsi_low_threshold, int, S_IRUGO); |
| 68 | MODULE_PARM_DESC(hsi_low_threshold, "HSI high threshold (FLOW ON)."); |
| 69 | |
| 70 | #define ON 1 |
| 71 | #define OFF 0 |
| 72 | |
| 73 | /* |
| 74 | * Threshold values for the HSI packet queue. Flowcontrol will be asserted |
| 75 | * when the number of packets exceeds HIGH_WATER_MARK. It will not be |
| 76 | * de-asserted before the number of packets drops below LOW_WATER_MARK. |
| 77 | */ |
| 78 | #define LOW_WATER_MARK hsi_low_threshold |
| 79 | #define HIGH_WATER_MARK hsi_high_threshold |
| 80 | |
| 81 | static LIST_HEAD(cfhsi_list); |
| 82 | static spinlock_t cfhsi_list_lock; |
| 83 | |
| 84 | static void cfhsi_inactivity_tout(unsigned long arg) |
| 85 | { |
| 86 | struct cfhsi *cfhsi = (struct cfhsi *)arg; |
| 87 | |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 88 | netdev_dbg(cfhsi->ndev, "%s.\n", |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 89 | __func__); |
| 90 | |
| 91 | /* Schedule power down work queue. */ |
| 92 | if (!test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) |
| 93 | queue_work(cfhsi->wq, &cfhsi->wake_down_work); |
| 94 | } |
| 95 | |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 96 | static void cfhsi_update_aggregation_stats(struct cfhsi *cfhsi, |
| 97 | const struct sk_buff *skb, |
| 98 | int direction) |
| 99 | { |
| 100 | struct caif_payload_info *info; |
| 101 | int hpad, tpad, len; |
| 102 | |
| 103 | info = (struct caif_payload_info *)&skb->cb; |
| 104 | hpad = 1 + PAD_POW2((info->hdr_len + 1), hsi_head_align); |
| 105 | tpad = PAD_POW2((skb->len + hpad), hsi_tail_align); |
| 106 | len = skb->len + hpad + tpad; |
| 107 | |
| 108 | if (direction > 0) |
| 109 | cfhsi->aggregation_len += len; |
| 110 | else if (direction < 0) |
| 111 | cfhsi->aggregation_len -= len; |
| 112 | } |
| 113 | |
| 114 | static bool cfhsi_can_send_aggregate(struct cfhsi *cfhsi) |
| 115 | { |
| 116 | int i; |
| 117 | |
Kim Lilliestierna XX | a5c96b5 | 2012-06-25 07:49:37 +0000 | [diff] [blame] | 118 | if (cfhsi->aggregation_timeout == 0) |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 119 | return true; |
| 120 | |
| 121 | for (i = 0; i < CFHSI_PRIO_BEBK; ++i) { |
| 122 | if (cfhsi->qhead[i].qlen) |
| 123 | return true; |
| 124 | } |
| 125 | |
| 126 | /* TODO: Use aggregation_len instead */ |
| 127 | if (cfhsi->qhead[CFHSI_PRIO_BEBK].qlen >= CFHSI_MAX_PKTS) |
| 128 | return true; |
| 129 | |
| 130 | return false; |
| 131 | } |
| 132 | |
| 133 | static struct sk_buff *cfhsi_dequeue(struct cfhsi *cfhsi) |
| 134 | { |
| 135 | struct sk_buff *skb; |
| 136 | int i; |
| 137 | |
| 138 | for (i = 0; i < CFHSI_PRIO_LAST; ++i) { |
| 139 | skb = skb_dequeue(&cfhsi->qhead[i]); |
| 140 | if (skb) |
| 141 | break; |
| 142 | } |
| 143 | |
| 144 | return skb; |
| 145 | } |
| 146 | |
| 147 | static int cfhsi_tx_queue_len(struct cfhsi *cfhsi) |
| 148 | { |
| 149 | int i, len = 0; |
| 150 | for (i = 0; i < CFHSI_PRIO_LAST; ++i) |
| 151 | len += skb_queue_len(&cfhsi->qhead[i]); |
| 152 | return len; |
| 153 | } |
| 154 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 155 | static void cfhsi_abort_tx(struct cfhsi *cfhsi) |
| 156 | { |
| 157 | struct sk_buff *skb; |
| 158 | |
| 159 | for (;;) { |
| 160 | spin_lock_bh(&cfhsi->lock); |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 161 | skb = cfhsi_dequeue(cfhsi); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 162 | if (!skb) |
| 163 | break; |
| 164 | |
| 165 | cfhsi->ndev->stats.tx_errors++; |
| 166 | cfhsi->ndev->stats.tx_dropped++; |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 167 | cfhsi_update_aggregation_stats(cfhsi, skb, -1); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 168 | spin_unlock_bh(&cfhsi->lock); |
| 169 | kfree_skb(skb); |
| 170 | } |
| 171 | cfhsi->tx_state = CFHSI_TX_STATE_IDLE; |
| 172 | if (!test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 173 | mod_timer(&cfhsi->inactivity_timer, |
Dmitry Tarnyagin | 28bd204 | 2011-10-13 11:29:27 +0000 | [diff] [blame] | 174 | jiffies + cfhsi->inactivity_timeout); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 175 | spin_unlock_bh(&cfhsi->lock); |
| 176 | } |
| 177 | |
| 178 | static int cfhsi_flush_fifo(struct cfhsi *cfhsi) |
| 179 | { |
| 180 | char buffer[32]; /* Any reasonable value */ |
| 181 | size_t fifo_occupancy; |
| 182 | int ret; |
| 183 | |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 184 | netdev_dbg(cfhsi->ndev, "%s.\n", |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 185 | __func__); |
| 186 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 187 | do { |
| 188 | ret = cfhsi->dev->cfhsi_fifo_occupancy(cfhsi->dev, |
| 189 | &fifo_occupancy); |
| 190 | if (ret) { |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 191 | netdev_warn(cfhsi->ndev, |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 192 | "%s: can't get FIFO occupancy: %d.\n", |
| 193 | __func__, ret); |
| 194 | break; |
| 195 | } else if (!fifo_occupancy) |
| 196 | /* No more data, exitting normally */ |
| 197 | break; |
| 198 | |
| 199 | fifo_occupancy = min(sizeof(buffer), fifo_occupancy); |
| 200 | set_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits); |
| 201 | ret = cfhsi->dev->cfhsi_rx(buffer, fifo_occupancy, |
| 202 | cfhsi->dev); |
| 203 | if (ret) { |
| 204 | clear_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits); |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 205 | netdev_warn(cfhsi->ndev, |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 206 | "%s: can't read data: %d.\n", |
| 207 | __func__, ret); |
| 208 | break; |
| 209 | } |
| 210 | |
| 211 | ret = 5 * HZ; |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 212 | ret = wait_event_interruptible_timeout(cfhsi->flush_fifo_wait, |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 213 | !test_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits), ret); |
| 214 | |
| 215 | if (ret < 0) { |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 216 | netdev_warn(cfhsi->ndev, |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 217 | "%s: can't wait for flush complete: %d.\n", |
| 218 | __func__, ret); |
| 219 | break; |
| 220 | } else if (!ret) { |
| 221 | ret = -ETIMEDOUT; |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 222 | netdev_warn(cfhsi->ndev, |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 223 | "%s: timeout waiting for flush complete.\n", |
| 224 | __func__); |
| 225 | break; |
| 226 | } |
| 227 | } while (1); |
| 228 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 229 | return ret; |
| 230 | } |
| 231 | |
| 232 | static int cfhsi_tx_frm(struct cfhsi_desc *desc, struct cfhsi *cfhsi) |
| 233 | { |
| 234 | int nfrms = 0; |
| 235 | int pld_len = 0; |
| 236 | struct sk_buff *skb; |
| 237 | u8 *pfrm = desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ; |
| 238 | |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 239 | skb = cfhsi_dequeue(cfhsi); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 240 | if (!skb) |
| 241 | return 0; |
| 242 | |
sjur.brandeland@stericsson.com | 94230fe | 2011-10-13 11:29:22 +0000 | [diff] [blame] | 243 | /* Clear offset. */ |
| 244 | desc->offset = 0; |
| 245 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 246 | /* Check if we can embed a CAIF frame. */ |
| 247 | if (skb->len < CFHSI_MAX_EMB_FRM_SZ) { |
| 248 | struct caif_payload_info *info; |
| 249 | int hpad = 0; |
| 250 | int tpad = 0; |
| 251 | |
| 252 | /* Calculate needed head alignment and tail alignment. */ |
| 253 | info = (struct caif_payload_info *)&skb->cb; |
| 254 | |
| 255 | hpad = 1 + PAD_POW2((info->hdr_len + 1), hsi_head_align); |
| 256 | tpad = PAD_POW2((skb->len + hpad), hsi_tail_align); |
| 257 | |
| 258 | /* Check if frame still fits with added alignment. */ |
| 259 | if ((skb->len + hpad + tpad) <= CFHSI_MAX_EMB_FRM_SZ) { |
| 260 | u8 *pemb = desc->emb_frm; |
| 261 | desc->offset = CFHSI_DESC_SHORT_SZ; |
| 262 | *pemb = (u8)(hpad - 1); |
| 263 | pemb += hpad; |
| 264 | |
| 265 | /* Update network statistics. */ |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 266 | spin_lock_bh(&cfhsi->lock); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 267 | cfhsi->ndev->stats.tx_packets++; |
| 268 | cfhsi->ndev->stats.tx_bytes += skb->len; |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 269 | cfhsi_update_aggregation_stats(cfhsi, skb, -1); |
| 270 | spin_unlock_bh(&cfhsi->lock); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 271 | |
| 272 | /* Copy in embedded CAIF frame. */ |
| 273 | skb_copy_bits(skb, 0, pemb, skb->len); |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 274 | |
| 275 | /* Consume the SKB */ |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 276 | consume_skb(skb); |
| 277 | skb = NULL; |
| 278 | } |
sjur.brandeland@stericsson.com | 94230fe | 2011-10-13 11:29:22 +0000 | [diff] [blame] | 279 | } |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 280 | |
| 281 | /* Create payload CAIF frames. */ |
| 282 | pfrm = desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ; |
| 283 | while (nfrms < CFHSI_MAX_PKTS) { |
| 284 | struct caif_payload_info *info; |
| 285 | int hpad = 0; |
| 286 | int tpad = 0; |
| 287 | |
| 288 | if (!skb) |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 289 | skb = cfhsi_dequeue(cfhsi); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 290 | |
| 291 | if (!skb) |
| 292 | break; |
| 293 | |
| 294 | /* Calculate needed head alignment and tail alignment. */ |
| 295 | info = (struct caif_payload_info *)&skb->cb; |
| 296 | |
| 297 | hpad = 1 + PAD_POW2((info->hdr_len + 1), hsi_head_align); |
| 298 | tpad = PAD_POW2((skb->len + hpad), hsi_tail_align); |
| 299 | |
| 300 | /* Fill in CAIF frame length in descriptor. */ |
| 301 | desc->cffrm_len[nfrms] = hpad + skb->len + tpad; |
| 302 | |
| 303 | /* Fill head padding information. */ |
| 304 | *pfrm = (u8)(hpad - 1); |
| 305 | pfrm += hpad; |
| 306 | |
| 307 | /* Update network statistics. */ |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 308 | spin_lock_bh(&cfhsi->lock); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 309 | cfhsi->ndev->stats.tx_packets++; |
| 310 | cfhsi->ndev->stats.tx_bytes += skb->len; |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 311 | cfhsi_update_aggregation_stats(cfhsi, skb, -1); |
| 312 | spin_unlock_bh(&cfhsi->lock); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 313 | |
| 314 | /* Copy in CAIF frame. */ |
| 315 | skb_copy_bits(skb, 0, pfrm, skb->len); |
| 316 | |
| 317 | /* Update payload length. */ |
| 318 | pld_len += desc->cffrm_len[nfrms]; |
| 319 | |
| 320 | /* Update frame pointer. */ |
| 321 | pfrm += skb->len + tpad; |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 322 | |
| 323 | /* Consume the SKB */ |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 324 | consume_skb(skb); |
| 325 | skb = NULL; |
| 326 | |
| 327 | /* Update number of frames. */ |
| 328 | nfrms++; |
| 329 | } |
| 330 | |
| 331 | /* Unused length fields should be zero-filled (according to SPEC). */ |
| 332 | while (nfrms < CFHSI_MAX_PKTS) { |
| 333 | desc->cffrm_len[nfrms] = 0x0000; |
| 334 | nfrms++; |
| 335 | } |
| 336 | |
| 337 | /* Check if we can piggy-back another descriptor. */ |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 338 | if (cfhsi_can_send_aggregate(cfhsi)) |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 339 | desc->header |= CFHSI_PIGGY_DESC; |
| 340 | else |
| 341 | desc->header &= ~CFHSI_PIGGY_DESC; |
| 342 | |
| 343 | return CFHSI_DESC_SZ + pld_len; |
| 344 | } |
| 345 | |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 346 | static void cfhsi_start_tx(struct cfhsi *cfhsi) |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 347 | { |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 348 | struct cfhsi_desc *desc = (struct cfhsi_desc *)cfhsi->tx_buf; |
| 349 | int len, res; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 350 | |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 351 | netdev_dbg(cfhsi->ndev, "%s.\n", __func__); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 352 | |
| 353 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) |
| 354 | return; |
| 355 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 356 | do { |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 357 | /* Create HSI frame. */ |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 358 | len = cfhsi_tx_frm(desc, cfhsi); |
| 359 | if (!len) { |
| 360 | spin_lock_bh(&cfhsi->lock); |
| 361 | if (unlikely(cfhsi_tx_queue_len(cfhsi))) { |
Dmitry Tarnyagin | fe47f12 | 2011-10-13 11:29:23 +0000 | [diff] [blame] | 362 | spin_unlock_bh(&cfhsi->lock); |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 363 | res = -EAGAIN; |
| 364 | continue; |
Dmitry Tarnyagin | fe47f12 | 2011-10-13 11:29:23 +0000 | [diff] [blame] | 365 | } |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 366 | cfhsi->tx_state = CFHSI_TX_STATE_IDLE; |
| 367 | /* Start inactivity timer. */ |
| 368 | mod_timer(&cfhsi->inactivity_timer, |
| 369 | jiffies + cfhsi->inactivity_timeout); |
| 370 | spin_unlock_bh(&cfhsi->lock); |
| 371 | break; |
| 372 | } |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 373 | |
| 374 | /* Set up new transfer. */ |
| 375 | res = cfhsi->dev->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->dev); |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 376 | if (WARN_ON(res < 0)) |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 377 | netdev_err(cfhsi->ndev, "%s: TX error %d.\n", |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 378 | __func__, res); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 379 | } while (res < 0); |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 380 | } |
Dmitry Tarnyagin | fe47f12 | 2011-10-13 11:29:23 +0000 | [diff] [blame] | 381 | |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 382 | static void cfhsi_tx_done(struct cfhsi *cfhsi) |
| 383 | { |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 384 | netdev_dbg(cfhsi->ndev, "%s.\n", __func__); |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 385 | |
| 386 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) |
| 387 | return; |
| 388 | |
| 389 | /* |
| 390 | * Send flow on if flow off has been previously signalled |
| 391 | * and number of packets is below low water mark. |
| 392 | */ |
| 393 | spin_lock_bh(&cfhsi->lock); |
| 394 | if (cfhsi->flow_off_sent && |
| 395 | cfhsi_tx_queue_len(cfhsi) <= cfhsi->q_low_mark && |
| 396 | cfhsi->cfdev.flowctrl) { |
| 397 | |
| 398 | cfhsi->flow_off_sent = 0; |
| 399 | cfhsi->cfdev.flowctrl(cfhsi->ndev, ON); |
| 400 | } |
| 401 | |
| 402 | if (cfhsi_can_send_aggregate(cfhsi)) { |
| 403 | spin_unlock_bh(&cfhsi->lock); |
| 404 | cfhsi_start_tx(cfhsi); |
| 405 | } else { |
| 406 | mod_timer(&cfhsi->aggregation_timer, |
| 407 | jiffies + cfhsi->aggregation_timeout); |
| 408 | spin_unlock_bh(&cfhsi->lock); |
| 409 | } |
| 410 | |
Dmitry Tarnyagin | fe47f12 | 2011-10-13 11:29:23 +0000 | [diff] [blame] | 411 | return; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 412 | } |
| 413 | |
| 414 | static void cfhsi_tx_done_cb(struct cfhsi_drv *drv) |
| 415 | { |
| 416 | struct cfhsi *cfhsi; |
| 417 | |
| 418 | cfhsi = container_of(drv, struct cfhsi, drv); |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 419 | netdev_dbg(cfhsi->ndev, "%s.\n", |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 420 | __func__); |
| 421 | |
| 422 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) |
| 423 | return; |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 424 | cfhsi_tx_done(cfhsi); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 425 | } |
| 426 | |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame] | 427 | static int cfhsi_rx_desc(struct cfhsi_desc *desc, struct cfhsi *cfhsi) |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 428 | { |
| 429 | int xfer_sz = 0; |
| 430 | int nfrms = 0; |
| 431 | u16 *plen = NULL; |
| 432 | u8 *pfrm = NULL; |
| 433 | |
| 434 | if ((desc->header & ~CFHSI_PIGGY_DESC) || |
| 435 | (desc->offset > CFHSI_MAX_EMB_FRM_SZ)) { |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 436 | netdev_err(cfhsi->ndev, "%s: Invalid descriptor.\n", |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 437 | __func__); |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame] | 438 | return -EPROTO; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 439 | } |
| 440 | |
| 441 | /* Check for embedded CAIF frame. */ |
| 442 | if (desc->offset) { |
| 443 | struct sk_buff *skb; |
| 444 | u8 *dst = NULL; |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 445 | int len = 0; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 446 | pfrm = ((u8 *)desc) + desc->offset; |
| 447 | |
| 448 | /* Remove offset padding. */ |
| 449 | pfrm += *pfrm + 1; |
| 450 | |
| 451 | /* Read length of CAIF frame (little endian). */ |
| 452 | len = *pfrm; |
| 453 | len |= ((*(pfrm+1)) << 8) & 0xFF00; |
| 454 | len += 2; /* Add FCS fields. */ |
| 455 | |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame] | 456 | /* Sanity check length of CAIF frame. */ |
| 457 | if (unlikely(len > CFHSI_MAX_CAIF_FRAME_SZ)) { |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 458 | netdev_err(cfhsi->ndev, "%s: Invalid length.\n", |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame] | 459 | __func__); |
| 460 | return -EPROTO; |
| 461 | } |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 462 | |
| 463 | /* Allocate SKB (OK even in IRQ context). */ |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 464 | skb = alloc_skb(len + 1, GFP_ATOMIC); |
| 465 | if (!skb) { |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 466 | netdev_err(cfhsi->ndev, "%s: Out of memory !\n", |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 467 | __func__); |
| 468 | return -ENOMEM; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 469 | } |
| 470 | caif_assert(skb != NULL); |
| 471 | |
| 472 | dst = skb_put(skb, len); |
| 473 | memcpy(dst, pfrm, len); |
| 474 | |
| 475 | skb->protocol = htons(ETH_P_CAIF); |
| 476 | skb_reset_mac_header(skb); |
| 477 | skb->dev = cfhsi->ndev; |
| 478 | |
| 479 | /* |
| 480 | * We are called from a arch specific platform device. |
| 481 | * Unfortunately we don't know what context we're |
| 482 | * running in. |
| 483 | */ |
| 484 | if (in_interrupt()) |
| 485 | netif_rx(skb); |
| 486 | else |
| 487 | netif_rx_ni(skb); |
| 488 | |
| 489 | /* Update network statistics. */ |
| 490 | cfhsi->ndev->stats.rx_packets++; |
| 491 | cfhsi->ndev->stats.rx_bytes += len; |
| 492 | } |
| 493 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 494 | /* Calculate transfer length. */ |
| 495 | plen = desc->cffrm_len; |
| 496 | while (nfrms < CFHSI_MAX_PKTS && *plen) { |
| 497 | xfer_sz += *plen; |
| 498 | plen++; |
| 499 | nfrms++; |
| 500 | } |
| 501 | |
| 502 | /* Check for piggy-backed descriptor. */ |
| 503 | if (desc->header & CFHSI_PIGGY_DESC) |
| 504 | xfer_sz += CFHSI_DESC_SZ; |
| 505 | |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame] | 506 | if ((xfer_sz % 4) || (xfer_sz > (CFHSI_BUF_SZ_RX - CFHSI_DESC_SZ))) { |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 507 | netdev_err(cfhsi->ndev, |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 508 | "%s: Invalid payload len: %d, ignored.\n", |
| 509 | __func__, xfer_sz); |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame] | 510 | return -EPROTO; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 511 | } |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 512 | return xfer_sz; |
| 513 | } |
| 514 | |
sjur.brandeland@stericsson.com | 332ad43 | 2012-02-03 04:36:21 +0000 | [diff] [blame] | 515 | static int cfhsi_rx_desc_len(struct cfhsi_desc *desc) |
| 516 | { |
| 517 | int xfer_sz = 0; |
| 518 | int nfrms = 0; |
| 519 | u16 *plen; |
| 520 | |
| 521 | if ((desc->header & ~CFHSI_PIGGY_DESC) || |
| 522 | (desc->offset > CFHSI_MAX_EMB_FRM_SZ)) { |
| 523 | |
| 524 | pr_err("Invalid descriptor. %x %x\n", desc->header, |
| 525 | desc->offset); |
| 526 | return -EPROTO; |
| 527 | } |
| 528 | |
| 529 | /* Calculate transfer length. */ |
| 530 | plen = desc->cffrm_len; |
| 531 | while (nfrms < CFHSI_MAX_PKTS && *plen) { |
| 532 | xfer_sz += *plen; |
| 533 | plen++; |
| 534 | nfrms++; |
| 535 | } |
| 536 | |
| 537 | if (xfer_sz % 4) { |
| 538 | pr_err("Invalid payload len: %d, ignored.\n", xfer_sz); |
| 539 | return -EPROTO; |
| 540 | } |
| 541 | return xfer_sz; |
| 542 | } |
| 543 | |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame] | 544 | static int cfhsi_rx_pld(struct cfhsi_desc *desc, struct cfhsi *cfhsi) |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 545 | { |
| 546 | int rx_sz = 0; |
| 547 | int nfrms = 0; |
| 548 | u16 *plen = NULL; |
| 549 | u8 *pfrm = NULL; |
| 550 | |
| 551 | /* Sanity check header and offset. */ |
| 552 | if (WARN_ON((desc->header & ~CFHSI_PIGGY_DESC) || |
| 553 | (desc->offset > CFHSI_MAX_EMB_FRM_SZ))) { |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 554 | netdev_err(cfhsi->ndev, "%s: Invalid descriptor.\n", |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 555 | __func__); |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame] | 556 | return -EPROTO; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 557 | } |
| 558 | |
| 559 | /* Set frame pointer to start of payload. */ |
| 560 | pfrm = desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ; |
| 561 | plen = desc->cffrm_len; |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 562 | |
| 563 | /* Skip already processed frames. */ |
| 564 | while (nfrms < cfhsi->rx_state.nfrms) { |
| 565 | pfrm += *plen; |
| 566 | rx_sz += *plen; |
| 567 | plen++; |
| 568 | nfrms++; |
| 569 | } |
| 570 | |
| 571 | /* Parse payload. */ |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 572 | while (nfrms < CFHSI_MAX_PKTS && *plen) { |
| 573 | struct sk_buff *skb; |
| 574 | u8 *dst = NULL; |
| 575 | u8 *pcffrm = NULL; |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 576 | int len = 0; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 577 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 578 | /* CAIF frame starts after head padding. */ |
| 579 | pcffrm = pfrm + *pfrm + 1; |
| 580 | |
| 581 | /* Read length of CAIF frame (little endian). */ |
| 582 | len = *pcffrm; |
| 583 | len |= ((*(pcffrm + 1)) << 8) & 0xFF00; |
| 584 | len += 2; /* Add FCS fields. */ |
| 585 | |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame] | 586 | /* Sanity check length of CAIF frames. */ |
| 587 | if (unlikely(len > CFHSI_MAX_CAIF_FRAME_SZ)) { |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 588 | netdev_err(cfhsi->ndev, "%s: Invalid length.\n", |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame] | 589 | __func__); |
| 590 | return -EPROTO; |
| 591 | } |
| 592 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 593 | /* Allocate SKB (OK even in IRQ context). */ |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 594 | skb = alloc_skb(len + 1, GFP_ATOMIC); |
| 595 | if (!skb) { |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 596 | netdev_err(cfhsi->ndev, "%s: Out of memory !\n", |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 597 | __func__); |
| 598 | cfhsi->rx_state.nfrms = nfrms; |
| 599 | return -ENOMEM; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 600 | } |
| 601 | caif_assert(skb != NULL); |
| 602 | |
| 603 | dst = skb_put(skb, len); |
| 604 | memcpy(dst, pcffrm, len); |
| 605 | |
| 606 | skb->protocol = htons(ETH_P_CAIF); |
| 607 | skb_reset_mac_header(skb); |
| 608 | skb->dev = cfhsi->ndev; |
| 609 | |
| 610 | /* |
| 611 | * We're called from a platform device, |
| 612 | * and don't know the context we're running in. |
| 613 | */ |
| 614 | if (in_interrupt()) |
| 615 | netif_rx(skb); |
| 616 | else |
| 617 | netif_rx_ni(skb); |
| 618 | |
| 619 | /* Update network statistics. */ |
| 620 | cfhsi->ndev->stats.rx_packets++; |
| 621 | cfhsi->ndev->stats.rx_bytes += len; |
| 622 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 623 | pfrm += *plen; |
| 624 | rx_sz += *plen; |
| 625 | plen++; |
| 626 | nfrms++; |
| 627 | } |
| 628 | |
| 629 | return rx_sz; |
| 630 | } |
| 631 | |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 632 | static void cfhsi_rx_done(struct cfhsi *cfhsi) |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 633 | { |
| 634 | int res; |
sjur.brandeland@stericsson.com | 332ad43 | 2012-02-03 04:36:21 +0000 | [diff] [blame] | 635 | int desc_pld_len = 0, rx_len, rx_state; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 636 | struct cfhsi_desc *desc = NULL; |
sjur.brandeland@stericsson.com | 332ad43 | 2012-02-03 04:36:21 +0000 | [diff] [blame] | 637 | u8 *rx_ptr, *rx_buf; |
| 638 | struct cfhsi_desc *piggy_desc = NULL; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 639 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 640 | desc = (struct cfhsi_desc *)cfhsi->rx_buf; |
| 641 | |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 642 | netdev_dbg(cfhsi->ndev, "%s\n", __func__); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 643 | |
| 644 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) |
| 645 | return; |
| 646 | |
| 647 | /* Update inactivity timer if pending. */ |
Dmitry Tarnyagin | 73033c9 | 2011-10-13 11:29:24 +0000 | [diff] [blame] | 648 | spin_lock_bh(&cfhsi->lock); |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 649 | mod_timer_pending(&cfhsi->inactivity_timer, |
Dmitry Tarnyagin | 28bd204 | 2011-10-13 11:29:27 +0000 | [diff] [blame] | 650 | jiffies + cfhsi->inactivity_timeout); |
Dmitry Tarnyagin | 73033c9 | 2011-10-13 11:29:24 +0000 | [diff] [blame] | 651 | spin_unlock_bh(&cfhsi->lock); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 652 | |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 653 | if (cfhsi->rx_state.state == CFHSI_RX_STATE_DESC) { |
sjur.brandeland@stericsson.com | 332ad43 | 2012-02-03 04:36:21 +0000 | [diff] [blame] | 654 | desc_pld_len = cfhsi_rx_desc_len(desc); |
| 655 | |
| 656 | if (desc_pld_len < 0) |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame] | 657 | goto out_of_sync; |
sjur.brandeland@stericsson.com | 332ad43 | 2012-02-03 04:36:21 +0000 | [diff] [blame] | 658 | |
| 659 | rx_buf = cfhsi->rx_buf; |
| 660 | rx_len = desc_pld_len; |
| 661 | if (desc_pld_len > 0 && (desc->header & CFHSI_PIGGY_DESC)) |
| 662 | rx_len += CFHSI_DESC_SZ; |
| 663 | if (desc_pld_len == 0) |
| 664 | rx_buf = cfhsi->rx_flip_buf; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 665 | } else { |
sjur.brandeland@stericsson.com | 332ad43 | 2012-02-03 04:36:21 +0000 | [diff] [blame] | 666 | rx_buf = cfhsi->rx_flip_buf; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 667 | |
sjur.brandeland@stericsson.com | 332ad43 | 2012-02-03 04:36:21 +0000 | [diff] [blame] | 668 | rx_len = CFHSI_DESC_SZ; |
| 669 | if (cfhsi->rx_state.pld_len > 0 && |
| 670 | (desc->header & CFHSI_PIGGY_DESC)) { |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 671 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 672 | piggy_desc = (struct cfhsi_desc *) |
| 673 | (desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ + |
sjur.brandeland@stericsson.com | 332ad43 | 2012-02-03 04:36:21 +0000 | [diff] [blame] | 674 | cfhsi->rx_state.pld_len); |
| 675 | |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 676 | cfhsi->rx_state.piggy_desc = true; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 677 | |
sjur.brandeland@stericsson.com | 332ad43 | 2012-02-03 04:36:21 +0000 | [diff] [blame] | 678 | /* Extract payload len from piggy-backed descriptor. */ |
| 679 | desc_pld_len = cfhsi_rx_desc_len(piggy_desc); |
| 680 | if (desc_pld_len < 0) |
| 681 | goto out_of_sync; |
| 682 | |
Kim Lilliestierna XX | 4e7bb59 | 2012-06-25 07:49:36 +0000 | [diff] [blame] | 683 | if (desc_pld_len > 0) { |
sjur.brandeland@stericsson.com | 332ad43 | 2012-02-03 04:36:21 +0000 | [diff] [blame] | 684 | rx_len = desc_pld_len; |
Kim Lilliestierna XX | 4e7bb59 | 2012-06-25 07:49:36 +0000 | [diff] [blame] | 685 | if (piggy_desc->header & CFHSI_PIGGY_DESC) |
| 686 | rx_len += CFHSI_DESC_SZ; |
| 687 | } |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 688 | |
| 689 | /* |
| 690 | * Copy needed information from the piggy-backed |
| 691 | * descriptor to the descriptor in the start. |
| 692 | */ |
sjur.brandeland@stericsson.com | 332ad43 | 2012-02-03 04:36:21 +0000 | [diff] [blame] | 693 | memcpy(rx_buf, (u8 *)piggy_desc, |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 694 | CFHSI_DESC_SHORT_SZ); |
sjur.brandeland@stericsson.com | 332ad43 | 2012-02-03 04:36:21 +0000 | [diff] [blame] | 695 | /* Mark no embedded frame here */ |
| 696 | piggy_desc->offset = 0; |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame] | 697 | } |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 698 | } |
| 699 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 700 | if (desc_pld_len) { |
sjur.brandeland@stericsson.com | 332ad43 | 2012-02-03 04:36:21 +0000 | [diff] [blame] | 701 | rx_state = CFHSI_RX_STATE_PAYLOAD; |
| 702 | rx_ptr = rx_buf + CFHSI_DESC_SZ; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 703 | } else { |
sjur.brandeland@stericsson.com | 332ad43 | 2012-02-03 04:36:21 +0000 | [diff] [blame] | 704 | rx_state = CFHSI_RX_STATE_DESC; |
| 705 | rx_ptr = rx_buf; |
| 706 | rx_len = CFHSI_DESC_SZ; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 707 | } |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 708 | |
sjur.brandeland@stericsson.com | 332ad43 | 2012-02-03 04:36:21 +0000 | [diff] [blame] | 709 | /* Initiate next read */ |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 710 | if (test_bit(CFHSI_AWAKE, &cfhsi->bits)) { |
| 711 | /* Set up new transfer. */ |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 712 | netdev_dbg(cfhsi->ndev, "%s: Start RX.\n", |
sjur.brandeland@stericsson.com | 332ad43 | 2012-02-03 04:36:21 +0000 | [diff] [blame] | 713 | __func__); |
| 714 | |
| 715 | res = cfhsi->dev->cfhsi_rx(rx_ptr, rx_len, |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 716 | cfhsi->dev); |
| 717 | if (WARN_ON(res < 0)) { |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 718 | netdev_err(cfhsi->ndev, "%s: RX error %d.\n", |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 719 | __func__, res); |
| 720 | cfhsi->ndev->stats.rx_errors++; |
| 721 | cfhsi->ndev->stats.rx_dropped++; |
| 722 | } |
| 723 | } |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 724 | |
sjur.brandeland@stericsson.com | 332ad43 | 2012-02-03 04:36:21 +0000 | [diff] [blame] | 725 | if (cfhsi->rx_state.state == CFHSI_RX_STATE_DESC) { |
| 726 | /* Extract payload from descriptor */ |
| 727 | if (cfhsi_rx_desc(desc, cfhsi) < 0) |
| 728 | goto out_of_sync; |
| 729 | } else { |
| 730 | /* Extract payload */ |
| 731 | if (cfhsi_rx_pld(desc, cfhsi) < 0) |
| 732 | goto out_of_sync; |
| 733 | if (piggy_desc) { |
| 734 | /* Extract any payload in piggyback descriptor. */ |
| 735 | if (cfhsi_rx_desc(piggy_desc, cfhsi) < 0) |
| 736 | goto out_of_sync; |
| 737 | } |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 738 | } |
sjur.brandeland@stericsson.com | 332ad43 | 2012-02-03 04:36:21 +0000 | [diff] [blame] | 739 | |
| 740 | /* Update state info */ |
| 741 | memset(&cfhsi->rx_state, 0, sizeof(cfhsi->rx_state)); |
| 742 | cfhsi->rx_state.state = rx_state; |
| 743 | cfhsi->rx_ptr = rx_ptr; |
| 744 | cfhsi->rx_len = rx_len; |
| 745 | cfhsi->rx_state.pld_len = desc_pld_len; |
| 746 | cfhsi->rx_state.piggy_desc = desc->header & CFHSI_PIGGY_DESC; |
| 747 | |
| 748 | if (rx_buf != cfhsi->rx_buf) |
| 749 | swap(cfhsi->rx_buf, cfhsi->rx_flip_buf); |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame] | 750 | return; |
| 751 | |
| 752 | out_of_sync: |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 753 | netdev_err(cfhsi->ndev, "%s: Out of sync.\n", __func__); |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame] | 754 | print_hex_dump_bytes("--> ", DUMP_PREFIX_NONE, |
| 755 | cfhsi->rx_buf, CFHSI_DESC_SZ); |
| 756 | schedule_work(&cfhsi->out_of_sync_work); |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 757 | } |
| 758 | |
| 759 | static void cfhsi_rx_slowpath(unsigned long arg) |
| 760 | { |
| 761 | struct cfhsi *cfhsi = (struct cfhsi *)arg; |
| 762 | |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 763 | netdev_dbg(cfhsi->ndev, "%s.\n", |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 764 | __func__); |
| 765 | |
| 766 | cfhsi_rx_done(cfhsi); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 767 | } |
| 768 | |
| 769 | static void cfhsi_rx_done_cb(struct cfhsi_drv *drv) |
| 770 | { |
| 771 | struct cfhsi *cfhsi; |
| 772 | |
| 773 | cfhsi = container_of(drv, struct cfhsi, drv); |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 774 | netdev_dbg(cfhsi->ndev, "%s.\n", |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 775 | __func__); |
| 776 | |
| 777 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) |
| 778 | return; |
| 779 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 780 | if (test_and_clear_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits)) |
| 781 | wake_up_interruptible(&cfhsi->flush_fifo_wait); |
| 782 | else |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 783 | cfhsi_rx_done(cfhsi); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 784 | } |
| 785 | |
| 786 | static void cfhsi_wake_up(struct work_struct *work) |
| 787 | { |
| 788 | struct cfhsi *cfhsi = NULL; |
| 789 | int res; |
| 790 | int len; |
| 791 | long ret; |
| 792 | |
| 793 | cfhsi = container_of(work, struct cfhsi, wake_up_work); |
| 794 | |
| 795 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) |
| 796 | return; |
| 797 | |
| 798 | if (unlikely(test_bit(CFHSI_AWAKE, &cfhsi->bits))) { |
| 799 | /* It happenes when wakeup is requested by |
| 800 | * both ends at the same time. */ |
| 801 | clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); |
Daniel Martensson | 5ea2ef5 | 2011-10-13 11:29:29 +0000 | [diff] [blame] | 802 | clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 803 | return; |
| 804 | } |
| 805 | |
| 806 | /* Activate wake line. */ |
| 807 | cfhsi->dev->cfhsi_wake_up(cfhsi->dev); |
| 808 | |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 809 | netdev_dbg(cfhsi->ndev, "%s: Start waiting.\n", |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 810 | __func__); |
| 811 | |
| 812 | /* Wait for acknowledge. */ |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 813 | ret = CFHSI_WAKE_TOUT; |
| 814 | ret = wait_event_interruptible_timeout(cfhsi->wake_up_wait, |
| 815 | test_and_clear_bit(CFHSI_WAKE_UP_ACK, |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 816 | &cfhsi->bits), ret); |
| 817 | if (unlikely(ret < 0)) { |
| 818 | /* Interrupted by signal. */ |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 819 | netdev_err(cfhsi->ndev, "%s: Signalled: %ld.\n", |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 820 | __func__, ret); |
Daniel Martensson | 5ea2ef5 | 2011-10-13 11:29:29 +0000 | [diff] [blame] | 821 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 822 | clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); |
| 823 | cfhsi->dev->cfhsi_wake_down(cfhsi->dev); |
| 824 | return; |
| 825 | } else if (!ret) { |
Daniel Martensson | 5ea2ef5 | 2011-10-13 11:29:29 +0000 | [diff] [blame] | 826 | bool ca_wake = false; |
| 827 | size_t fifo_occupancy = 0; |
| 828 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 829 | /* Wakeup timeout */ |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 830 | netdev_dbg(cfhsi->ndev, "%s: Timeout.\n", |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 831 | __func__); |
Daniel Martensson | 5ea2ef5 | 2011-10-13 11:29:29 +0000 | [diff] [blame] | 832 | |
| 833 | /* Check FIFO to check if modem has sent something. */ |
| 834 | WARN_ON(cfhsi->dev->cfhsi_fifo_occupancy(cfhsi->dev, |
| 835 | &fifo_occupancy)); |
| 836 | |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 837 | netdev_dbg(cfhsi->ndev, "%s: Bytes in FIFO: %u.\n", |
Daniel Martensson | 5ea2ef5 | 2011-10-13 11:29:29 +0000 | [diff] [blame] | 838 | __func__, (unsigned) fifo_occupancy); |
| 839 | |
| 840 | /* Check if we misssed the interrupt. */ |
| 841 | WARN_ON(cfhsi->dev->cfhsi_get_peer_wake(cfhsi->dev, |
| 842 | &ca_wake)); |
| 843 | |
| 844 | if (ca_wake) { |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 845 | netdev_err(cfhsi->ndev, "%s: CA Wake missed !.\n", |
Daniel Martensson | 5ea2ef5 | 2011-10-13 11:29:29 +0000 | [diff] [blame] | 846 | __func__); |
| 847 | |
| 848 | /* Clear the CFHSI_WAKE_UP_ACK bit to prevent race. */ |
| 849 | clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits); |
| 850 | |
| 851 | /* Continue execution. */ |
| 852 | goto wake_ack; |
| 853 | } |
| 854 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 855 | clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); |
| 856 | cfhsi->dev->cfhsi_wake_down(cfhsi->dev); |
| 857 | return; |
| 858 | } |
Daniel Martensson | 5ea2ef5 | 2011-10-13 11:29:29 +0000 | [diff] [blame] | 859 | wake_ack: |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 860 | netdev_dbg(cfhsi->ndev, "%s: Woken.\n", |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 861 | __func__); |
| 862 | |
| 863 | /* Clear power up bit. */ |
| 864 | set_bit(CFHSI_AWAKE, &cfhsi->bits); |
| 865 | clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); |
| 866 | |
| 867 | /* Resume read operation. */ |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 868 | netdev_dbg(cfhsi->ndev, "%s: Start RX.\n", __func__); |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 869 | res = cfhsi->dev->cfhsi_rx(cfhsi->rx_ptr, cfhsi->rx_len, cfhsi->dev); |
| 870 | |
| 871 | if (WARN_ON(res < 0)) |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 872 | netdev_err(cfhsi->ndev, "%s: RX err %d.\n", __func__, res); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 873 | |
| 874 | /* Clear power up acknowledment. */ |
| 875 | clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits); |
| 876 | |
| 877 | spin_lock_bh(&cfhsi->lock); |
| 878 | |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 879 | /* Resume transmit if queues are not empty. */ |
| 880 | if (!cfhsi_tx_queue_len(cfhsi)) { |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 881 | netdev_dbg(cfhsi->ndev, "%s: Peer wake, start timer.\n", |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 882 | __func__); |
| 883 | /* Start inactivity timer. */ |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 884 | mod_timer(&cfhsi->inactivity_timer, |
Dmitry Tarnyagin | 28bd204 | 2011-10-13 11:29:27 +0000 | [diff] [blame] | 885 | jiffies + cfhsi->inactivity_timeout); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 886 | spin_unlock_bh(&cfhsi->lock); |
| 887 | return; |
| 888 | } |
| 889 | |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 890 | netdev_dbg(cfhsi->ndev, "%s: Host wake.\n", |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 891 | __func__); |
| 892 | |
| 893 | spin_unlock_bh(&cfhsi->lock); |
| 894 | |
| 895 | /* Create HSI frame. */ |
| 896 | len = cfhsi_tx_frm((struct cfhsi_desc *)cfhsi->tx_buf, cfhsi); |
| 897 | |
| 898 | if (likely(len > 0)) { |
| 899 | /* Set up new transfer. */ |
| 900 | res = cfhsi->dev->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->dev); |
| 901 | if (WARN_ON(res < 0)) { |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 902 | netdev_err(cfhsi->ndev, "%s: TX error %d.\n", |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 903 | __func__, res); |
| 904 | cfhsi_abort_tx(cfhsi); |
| 905 | } |
| 906 | } else { |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 907 | netdev_err(cfhsi->ndev, |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 908 | "%s: Failed to create HSI frame: %d.\n", |
| 909 | __func__, len); |
| 910 | } |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 911 | } |
| 912 | |
| 913 | static void cfhsi_wake_down(struct work_struct *work) |
| 914 | { |
| 915 | long ret; |
| 916 | struct cfhsi *cfhsi = NULL; |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 917 | size_t fifo_occupancy = 0; |
| 918 | int retry = CFHSI_WAKE_TOUT; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 919 | |
| 920 | cfhsi = container_of(work, struct cfhsi, wake_down_work); |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 921 | netdev_dbg(cfhsi->ndev, "%s.\n", __func__); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 922 | |
| 923 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) |
| 924 | return; |
| 925 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 926 | /* Deactivate wake line. */ |
| 927 | cfhsi->dev->cfhsi_wake_down(cfhsi->dev); |
| 928 | |
| 929 | /* Wait for acknowledge. */ |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 930 | ret = CFHSI_WAKE_TOUT; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 931 | ret = wait_event_interruptible_timeout(cfhsi->wake_down_wait, |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 932 | test_and_clear_bit(CFHSI_WAKE_DOWN_ACK, |
| 933 | &cfhsi->bits), ret); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 934 | if (ret < 0) { |
| 935 | /* Interrupted by signal. */ |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 936 | netdev_err(cfhsi->ndev, "%s: Signalled: %ld.\n", |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 937 | __func__, ret); |
| 938 | return; |
| 939 | } else if (!ret) { |
Daniel Martensson | 5ea2ef5 | 2011-10-13 11:29:29 +0000 | [diff] [blame] | 940 | bool ca_wake = true; |
| 941 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 942 | /* Timeout */ |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 943 | netdev_err(cfhsi->ndev, "%s: Timeout.\n", __func__); |
Daniel Martensson | 5ea2ef5 | 2011-10-13 11:29:29 +0000 | [diff] [blame] | 944 | |
| 945 | /* Check if we misssed the interrupt. */ |
| 946 | WARN_ON(cfhsi->dev->cfhsi_get_peer_wake(cfhsi->dev, |
| 947 | &ca_wake)); |
| 948 | if (!ca_wake) |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 949 | netdev_err(cfhsi->ndev, "%s: CA Wake missed !.\n", |
Daniel Martensson | 5ea2ef5 | 2011-10-13 11:29:29 +0000 | [diff] [blame] | 950 | __func__); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 951 | } |
| 952 | |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 953 | /* Check FIFO occupancy. */ |
| 954 | while (retry) { |
| 955 | WARN_ON(cfhsi->dev->cfhsi_fifo_occupancy(cfhsi->dev, |
| 956 | &fifo_occupancy)); |
| 957 | |
| 958 | if (!fifo_occupancy) |
| 959 | break; |
| 960 | |
| 961 | set_current_state(TASK_INTERRUPTIBLE); |
| 962 | schedule_timeout(1); |
| 963 | retry--; |
| 964 | } |
| 965 | |
| 966 | if (!retry) |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 967 | netdev_err(cfhsi->ndev, "%s: FIFO Timeout.\n", __func__); |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 968 | |
| 969 | /* Clear AWAKE condition. */ |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 970 | clear_bit(CFHSI_AWAKE, &cfhsi->bits); |
| 971 | |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 972 | /* Cancel pending RX requests. */ |
| 973 | cfhsi->dev->cfhsi_rx_cancel(cfhsi->dev); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 974 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 975 | } |
| 976 | |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame] | 977 | static void cfhsi_out_of_sync(struct work_struct *work) |
| 978 | { |
| 979 | struct cfhsi *cfhsi = NULL; |
| 980 | |
| 981 | cfhsi = container_of(work, struct cfhsi, out_of_sync_work); |
| 982 | |
| 983 | rtnl_lock(); |
| 984 | dev_close(cfhsi->ndev); |
| 985 | rtnl_unlock(); |
| 986 | } |
| 987 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 988 | static void cfhsi_wake_up_cb(struct cfhsi_drv *drv) |
| 989 | { |
| 990 | struct cfhsi *cfhsi = NULL; |
| 991 | |
| 992 | cfhsi = container_of(drv, struct cfhsi, drv); |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 993 | netdev_dbg(cfhsi->ndev, "%s.\n", |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 994 | __func__); |
| 995 | |
| 996 | set_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits); |
| 997 | wake_up_interruptible(&cfhsi->wake_up_wait); |
| 998 | |
| 999 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) |
| 1000 | return; |
| 1001 | |
| 1002 | /* Schedule wake up work queue if the peer initiates. */ |
| 1003 | if (!test_and_set_bit(CFHSI_WAKE_UP, &cfhsi->bits)) |
| 1004 | queue_work(cfhsi->wq, &cfhsi->wake_up_work); |
| 1005 | } |
| 1006 | |
| 1007 | static void cfhsi_wake_down_cb(struct cfhsi_drv *drv) |
| 1008 | { |
| 1009 | struct cfhsi *cfhsi = NULL; |
| 1010 | |
| 1011 | cfhsi = container_of(drv, struct cfhsi, drv); |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 1012 | netdev_dbg(cfhsi->ndev, "%s.\n", |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1013 | __func__); |
| 1014 | |
| 1015 | /* Initiating low power is only permitted by the host (us). */ |
| 1016 | set_bit(CFHSI_WAKE_DOWN_ACK, &cfhsi->bits); |
| 1017 | wake_up_interruptible(&cfhsi->wake_down_wait); |
| 1018 | } |
| 1019 | |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 1020 | static void cfhsi_aggregation_tout(unsigned long arg) |
| 1021 | { |
| 1022 | struct cfhsi *cfhsi = (struct cfhsi *)arg; |
| 1023 | |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 1024 | netdev_dbg(cfhsi->ndev, "%s.\n", |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 1025 | __func__); |
| 1026 | |
| 1027 | cfhsi_start_tx(cfhsi); |
| 1028 | } |
| 1029 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1030 | static int cfhsi_xmit(struct sk_buff *skb, struct net_device *dev) |
| 1031 | { |
| 1032 | struct cfhsi *cfhsi = NULL; |
| 1033 | int start_xfer = 0; |
| 1034 | int timer_active; |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 1035 | int prio; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1036 | |
| 1037 | if (!dev) |
| 1038 | return -EINVAL; |
| 1039 | |
| 1040 | cfhsi = netdev_priv(dev); |
| 1041 | |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 1042 | switch (skb->priority) { |
| 1043 | case TC_PRIO_BESTEFFORT: |
| 1044 | case TC_PRIO_FILLER: |
| 1045 | case TC_PRIO_BULK: |
| 1046 | prio = CFHSI_PRIO_BEBK; |
| 1047 | break; |
| 1048 | case TC_PRIO_INTERACTIVE_BULK: |
| 1049 | prio = CFHSI_PRIO_VI; |
| 1050 | break; |
| 1051 | case TC_PRIO_INTERACTIVE: |
| 1052 | prio = CFHSI_PRIO_VO; |
| 1053 | break; |
| 1054 | case TC_PRIO_CONTROL: |
| 1055 | default: |
| 1056 | prio = CFHSI_PRIO_CTL; |
| 1057 | break; |
| 1058 | } |
| 1059 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1060 | spin_lock_bh(&cfhsi->lock); |
| 1061 | |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 1062 | /* Update aggregation statistics */ |
| 1063 | cfhsi_update_aggregation_stats(cfhsi, skb, 1); |
| 1064 | |
| 1065 | /* Queue the SKB */ |
| 1066 | skb_queue_tail(&cfhsi->qhead[prio], skb); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1067 | |
| 1068 | /* Sanity check; xmit should not be called after unregister_netdev */ |
| 1069 | if (WARN_ON(test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))) { |
| 1070 | spin_unlock_bh(&cfhsi->lock); |
| 1071 | cfhsi_abort_tx(cfhsi); |
| 1072 | return -EINVAL; |
| 1073 | } |
| 1074 | |
| 1075 | /* Send flow off if number of packets is above high water mark. */ |
| 1076 | if (!cfhsi->flow_off_sent && |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 1077 | cfhsi_tx_queue_len(cfhsi) > cfhsi->q_high_mark && |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1078 | cfhsi->cfdev.flowctrl) { |
| 1079 | cfhsi->flow_off_sent = 1; |
| 1080 | cfhsi->cfdev.flowctrl(cfhsi->ndev, OFF); |
| 1081 | } |
| 1082 | |
| 1083 | if (cfhsi->tx_state == CFHSI_TX_STATE_IDLE) { |
| 1084 | cfhsi->tx_state = CFHSI_TX_STATE_XFER; |
| 1085 | start_xfer = 1; |
| 1086 | } |
| 1087 | |
Dmitry Tarnyagin | 73033c9 | 2011-10-13 11:29:24 +0000 | [diff] [blame] | 1088 | if (!start_xfer) { |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 1089 | /* Send aggregate if it is possible */ |
| 1090 | bool aggregate_ready = |
| 1091 | cfhsi_can_send_aggregate(cfhsi) && |
| 1092 | del_timer(&cfhsi->aggregation_timer) > 0; |
Dmitry Tarnyagin | 73033c9 | 2011-10-13 11:29:24 +0000 | [diff] [blame] | 1093 | spin_unlock_bh(&cfhsi->lock); |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 1094 | if (aggregate_ready) |
| 1095 | cfhsi_start_tx(cfhsi); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1096 | return 0; |
Dmitry Tarnyagin | 73033c9 | 2011-10-13 11:29:24 +0000 | [diff] [blame] | 1097 | } |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1098 | |
| 1099 | /* Delete inactivity timer if started. */ |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 1100 | timer_active = del_timer_sync(&cfhsi->inactivity_timer); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1101 | |
Dmitry Tarnyagin | 73033c9 | 2011-10-13 11:29:24 +0000 | [diff] [blame] | 1102 | spin_unlock_bh(&cfhsi->lock); |
| 1103 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1104 | if (timer_active) { |
| 1105 | struct cfhsi_desc *desc = (struct cfhsi_desc *)cfhsi->tx_buf; |
| 1106 | int len; |
| 1107 | int res; |
| 1108 | |
| 1109 | /* Create HSI frame. */ |
| 1110 | len = cfhsi_tx_frm(desc, cfhsi); |
Roar Førde | f84ea77 | 2011-12-06 12:15:44 +0000 | [diff] [blame] | 1111 | WARN_ON(!len); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1112 | |
| 1113 | /* Set up new transfer. */ |
| 1114 | res = cfhsi->dev->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->dev); |
| 1115 | if (WARN_ON(res < 0)) { |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 1116 | netdev_err(cfhsi->ndev, "%s: TX error %d.\n", |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1117 | __func__, res); |
| 1118 | cfhsi_abort_tx(cfhsi); |
| 1119 | } |
| 1120 | } else { |
| 1121 | /* Schedule wake up work queue if the we initiate. */ |
| 1122 | if (!test_and_set_bit(CFHSI_WAKE_UP, &cfhsi->bits)) |
| 1123 | queue_work(cfhsi->wq, &cfhsi->wake_up_work); |
| 1124 | } |
| 1125 | |
| 1126 | return 0; |
| 1127 | } |
| 1128 | |
sjur.brandeland@stericsson.com | 39abbae | 2012-04-12 08:27:27 +0000 | [diff] [blame] | 1129 | static const struct net_device_ops cfhsi_ops; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1130 | |
| 1131 | static void cfhsi_setup(struct net_device *dev) |
| 1132 | { |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 1133 | int i; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1134 | struct cfhsi *cfhsi = netdev_priv(dev); |
| 1135 | dev->features = 0; |
| 1136 | dev->netdev_ops = &cfhsi_ops; |
| 1137 | dev->type = ARPHRD_CAIF; |
| 1138 | dev->flags = IFF_POINTOPOINT | IFF_NOARP; |
Sjur Brændeland | 34efc28 | 2012-03-04 08:38:58 +0000 | [diff] [blame] | 1139 | dev->mtu = CFHSI_MAX_CAIF_FRAME_SZ; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1140 | dev->tx_queue_len = 0; |
| 1141 | dev->destructor = free_netdev; |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 1142 | for (i = 0; i < CFHSI_PRIO_LAST; ++i) |
| 1143 | skb_queue_head_init(&cfhsi->qhead[i]); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1144 | cfhsi->cfdev.link_select = CAIF_LINK_HIGH_BANDW; |
| 1145 | cfhsi->cfdev.use_frag = false; |
| 1146 | cfhsi->cfdev.use_stx = false; |
| 1147 | cfhsi->cfdev.use_fcs = false; |
| 1148 | cfhsi->ndev = dev; |
| 1149 | } |
| 1150 | |
| 1151 | int cfhsi_probe(struct platform_device *pdev) |
| 1152 | { |
| 1153 | struct cfhsi *cfhsi = NULL; |
| 1154 | struct net_device *ndev; |
sjur.brandeland@stericsson.com | 39abbae | 2012-04-12 08:27:27 +0000 | [diff] [blame] | 1155 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1156 | int res; |
| 1157 | |
| 1158 | ndev = alloc_netdev(sizeof(struct cfhsi), "cfhsi%d", cfhsi_setup); |
Joe Perches | 7ac2ed0 | 2011-08-25 13:22:24 +0000 | [diff] [blame] | 1159 | if (!ndev) |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1160 | return -ENODEV; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1161 | |
| 1162 | cfhsi = netdev_priv(ndev); |
| 1163 | cfhsi->ndev = ndev; |
| 1164 | cfhsi->pdev = pdev; |
| 1165 | |
sjur.brandeland@stericsson.com | 39abbae | 2012-04-12 08:27:27 +0000 | [diff] [blame] | 1166 | /* Assign the HSI device. */ |
| 1167 | cfhsi->dev = pdev->dev.platform_data; |
| 1168 | |
| 1169 | /* Assign the driver to this HSI device. */ |
| 1170 | cfhsi->dev->drv = &cfhsi->drv; |
| 1171 | |
| 1172 | /* Register network device. */ |
| 1173 | res = register_netdev(ndev); |
| 1174 | if (res) { |
| 1175 | dev_err(&ndev->dev, "%s: Registration error: %d.\n", |
| 1176 | __func__, res); |
| 1177 | free_netdev(ndev); |
| 1178 | } |
| 1179 | /* Add CAIF HSI device to list. */ |
| 1180 | spin_lock(&cfhsi_list_lock); |
| 1181 | list_add_tail(&cfhsi->list, &cfhsi_list); |
| 1182 | spin_unlock(&cfhsi_list_lock); |
| 1183 | |
| 1184 | return res; |
| 1185 | } |
| 1186 | |
| 1187 | static int cfhsi_open(struct net_device *ndev) |
| 1188 | { |
| 1189 | struct cfhsi *cfhsi = netdev_priv(ndev); |
| 1190 | int res; |
| 1191 | |
| 1192 | clear_bit(CFHSI_SHUTDOWN, &cfhsi->bits); |
| 1193 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1194 | /* Initialize state vaiables. */ |
| 1195 | cfhsi->tx_state = CFHSI_TX_STATE_IDLE; |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 1196 | cfhsi->rx_state.state = CFHSI_RX_STATE_DESC; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1197 | |
| 1198 | /* Set flow info */ |
| 1199 | cfhsi->flow_off_sent = 0; |
| 1200 | cfhsi->q_low_mark = LOW_WATER_MARK; |
| 1201 | cfhsi->q_high_mark = HIGH_WATER_MARK; |
| 1202 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1203 | |
| 1204 | /* |
| 1205 | * Allocate a TX buffer with the size of a HSI packet descriptors |
| 1206 | * and the necessary room for CAIF payload frames. |
| 1207 | */ |
| 1208 | cfhsi->tx_buf = kzalloc(CFHSI_BUF_SZ_TX, GFP_KERNEL); |
| 1209 | if (!cfhsi->tx_buf) { |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1210 | res = -ENODEV; |
| 1211 | goto err_alloc_tx; |
| 1212 | } |
| 1213 | |
| 1214 | /* |
| 1215 | * Allocate a RX buffer with the size of two HSI packet descriptors and |
| 1216 | * the necessary room for CAIF payload frames. |
| 1217 | */ |
| 1218 | cfhsi->rx_buf = kzalloc(CFHSI_BUF_SZ_RX, GFP_KERNEL); |
| 1219 | if (!cfhsi->rx_buf) { |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1220 | res = -ENODEV; |
| 1221 | goto err_alloc_rx; |
| 1222 | } |
| 1223 | |
sjur.brandeland@stericsson.com | 332ad43 | 2012-02-03 04:36:21 +0000 | [diff] [blame] | 1224 | cfhsi->rx_flip_buf = kzalloc(CFHSI_BUF_SZ_RX, GFP_KERNEL); |
| 1225 | if (!cfhsi->rx_flip_buf) { |
| 1226 | res = -ENODEV; |
| 1227 | goto err_alloc_rx_flip; |
| 1228 | } |
| 1229 | |
Dmitry Tarnyagin | 28bd204 | 2011-10-13 11:29:27 +0000 | [diff] [blame] | 1230 | /* Pre-calculate inactivity timeout. */ |
| 1231 | if (inactivity_timeout != -1) { |
| 1232 | cfhsi->inactivity_timeout = |
| 1233 | inactivity_timeout * HZ / 1000; |
| 1234 | if (!cfhsi->inactivity_timeout) |
| 1235 | cfhsi->inactivity_timeout = 1; |
| 1236 | else if (cfhsi->inactivity_timeout > NEXT_TIMER_MAX_DELTA) |
| 1237 | cfhsi->inactivity_timeout = NEXT_TIMER_MAX_DELTA; |
| 1238 | } else { |
| 1239 | cfhsi->inactivity_timeout = NEXT_TIMER_MAX_DELTA; |
| 1240 | } |
| 1241 | |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 1242 | /* Initialize aggregation timeout */ |
| 1243 | cfhsi->aggregation_timeout = aggregation_timeout; |
| 1244 | |
Dmitry Tarnyagin | 28bd204 | 2011-10-13 11:29:27 +0000 | [diff] [blame] | 1245 | /* Initialize recieve vaiables. */ |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1246 | cfhsi->rx_ptr = cfhsi->rx_buf; |
| 1247 | cfhsi->rx_len = CFHSI_DESC_SZ; |
| 1248 | |
| 1249 | /* Initialize spin locks. */ |
| 1250 | spin_lock_init(&cfhsi->lock); |
| 1251 | |
| 1252 | /* Set up the driver. */ |
| 1253 | cfhsi->drv.tx_done_cb = cfhsi_tx_done_cb; |
| 1254 | cfhsi->drv.rx_done_cb = cfhsi_rx_done_cb; |
sjur.brandeland@stericsson.com | 94230fe | 2011-10-13 11:29:22 +0000 | [diff] [blame] | 1255 | cfhsi->drv.wake_up_cb = cfhsi_wake_up_cb; |
| 1256 | cfhsi->drv.wake_down_cb = cfhsi_wake_down_cb; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1257 | |
| 1258 | /* Initialize the work queues. */ |
| 1259 | INIT_WORK(&cfhsi->wake_up_work, cfhsi_wake_up); |
| 1260 | INIT_WORK(&cfhsi->wake_down_work, cfhsi_wake_down); |
Daniel Martensson | 5bbed92 | 2011-10-13 11:29:28 +0000 | [diff] [blame] | 1261 | INIT_WORK(&cfhsi->out_of_sync_work, cfhsi_out_of_sync); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1262 | |
| 1263 | /* Clear all bit fields. */ |
| 1264 | clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits); |
| 1265 | clear_bit(CFHSI_WAKE_DOWN_ACK, &cfhsi->bits); |
| 1266 | clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); |
| 1267 | clear_bit(CFHSI_AWAKE, &cfhsi->bits); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1268 | |
| 1269 | /* Create work thread. */ |
sjur.brandeland@stericsson.com | 39abbae | 2012-04-12 08:27:27 +0000 | [diff] [blame] | 1270 | cfhsi->wq = create_singlethread_workqueue(cfhsi->pdev->name); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1271 | if (!cfhsi->wq) { |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 1272 | netdev_err(cfhsi->ndev, "%s: Failed to create work queue.\n", |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1273 | __func__); |
| 1274 | res = -ENODEV; |
| 1275 | goto err_create_wq; |
| 1276 | } |
| 1277 | |
| 1278 | /* Initialize wait queues. */ |
| 1279 | init_waitqueue_head(&cfhsi->wake_up_wait); |
| 1280 | init_waitqueue_head(&cfhsi->wake_down_wait); |
| 1281 | init_waitqueue_head(&cfhsi->flush_fifo_wait); |
| 1282 | |
| 1283 | /* Setup the inactivity timer. */ |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 1284 | init_timer(&cfhsi->inactivity_timer); |
| 1285 | cfhsi->inactivity_timer.data = (unsigned long)cfhsi; |
| 1286 | cfhsi->inactivity_timer.function = cfhsi_inactivity_tout; |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 1287 | /* Setup the slowpath RX timer. */ |
| 1288 | init_timer(&cfhsi->rx_slowpath_timer); |
| 1289 | cfhsi->rx_slowpath_timer.data = (unsigned long)cfhsi; |
| 1290 | cfhsi->rx_slowpath_timer.function = cfhsi_rx_slowpath; |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 1291 | /* Setup the aggregation timer. */ |
| 1292 | init_timer(&cfhsi->aggregation_timer); |
| 1293 | cfhsi->aggregation_timer.data = (unsigned long)cfhsi; |
| 1294 | cfhsi->aggregation_timer.function = cfhsi_aggregation_tout; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1295 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1296 | /* Activate HSI interface. */ |
| 1297 | res = cfhsi->dev->cfhsi_up(cfhsi->dev); |
| 1298 | if (res) { |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 1299 | netdev_err(cfhsi->ndev, |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1300 | "%s: can't activate HSI interface: %d.\n", |
| 1301 | __func__, res); |
| 1302 | goto err_activate; |
| 1303 | } |
| 1304 | |
| 1305 | /* Flush FIFO */ |
| 1306 | res = cfhsi_flush_fifo(cfhsi); |
| 1307 | if (res) { |
Sjur Brændeland | 90de9bab | 2012-06-25 07:49:38 +0000 | [diff] [blame^] | 1308 | netdev_err(cfhsi->ndev, "%s: Can't flush FIFO: %d.\n", |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1309 | __func__, res); |
| 1310 | goto err_net_reg; |
| 1311 | } |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1312 | return res; |
| 1313 | |
| 1314 | err_net_reg: |
| 1315 | cfhsi->dev->cfhsi_down(cfhsi->dev); |
| 1316 | err_activate: |
| 1317 | destroy_workqueue(cfhsi->wq); |
| 1318 | err_create_wq: |
sjur.brandeland@stericsson.com | 332ad43 | 2012-02-03 04:36:21 +0000 | [diff] [blame] | 1319 | kfree(cfhsi->rx_flip_buf); |
| 1320 | err_alloc_rx_flip: |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1321 | kfree(cfhsi->rx_buf); |
| 1322 | err_alloc_rx: |
| 1323 | kfree(cfhsi->tx_buf); |
| 1324 | err_alloc_tx: |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1325 | return res; |
| 1326 | } |
| 1327 | |
sjur.brandeland@stericsson.com | 39abbae | 2012-04-12 08:27:27 +0000 | [diff] [blame] | 1328 | static int cfhsi_close(struct net_device *ndev) |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1329 | { |
sjur.brandeland@stericsson.com | 39abbae | 2012-04-12 08:27:27 +0000 | [diff] [blame] | 1330 | struct cfhsi *cfhsi = netdev_priv(ndev); |
sjur.brandeland@stericsson.com | 5f614e6 | 2012-04-12 08:18:08 +0000 | [diff] [blame] | 1331 | u8 *tx_buf, *rx_buf, *flip_buf; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1332 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1333 | /* going to shutdown driver */ |
| 1334 | set_bit(CFHSI_SHUTDOWN, &cfhsi->bits); |
| 1335 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1336 | /* Flush workqueue */ |
| 1337 | flush_workqueue(cfhsi->wq); |
| 1338 | |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 1339 | /* Delete timers if pending */ |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 1340 | del_timer_sync(&cfhsi->inactivity_timer); |
Daniel Martensson | 687b13e | 2011-10-13 11:29:25 +0000 | [diff] [blame] | 1341 | del_timer_sync(&cfhsi->rx_slowpath_timer); |
Dmitry Tarnyagin | ece367d | 2012-04-12 08:27:25 +0000 | [diff] [blame] | 1342 | del_timer_sync(&cfhsi->aggregation_timer); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1343 | |
| 1344 | /* Cancel pending RX request (if any) */ |
| 1345 | cfhsi->dev->cfhsi_rx_cancel(cfhsi->dev); |
| 1346 | |
Daniel Martensson | ca63f8c | 2011-10-13 11:29:26 +0000 | [diff] [blame] | 1347 | /* Destroy workqueue */ |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1348 | destroy_workqueue(cfhsi->wq); |
| 1349 | |
| 1350 | /* Store bufferes: will be freed later. */ |
| 1351 | tx_buf = cfhsi->tx_buf; |
| 1352 | rx_buf = cfhsi->rx_buf; |
sjur.brandeland@stericsson.com | 5f614e6 | 2012-04-12 08:18:08 +0000 | [diff] [blame] | 1353 | flip_buf = cfhsi->rx_flip_buf; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1354 | /* Flush transmit queues. */ |
| 1355 | cfhsi_abort_tx(cfhsi); |
| 1356 | |
| 1357 | /* Deactivate interface */ |
| 1358 | cfhsi->dev->cfhsi_down(cfhsi->dev); |
| 1359 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1360 | /* Free buffers. */ |
| 1361 | kfree(tx_buf); |
| 1362 | kfree(rx_buf); |
sjur.brandeland@stericsson.com | 5f614e6 | 2012-04-12 08:18:08 +0000 | [diff] [blame] | 1363 | kfree(flip_buf); |
sjur.brandeland@stericsson.com | 39abbae | 2012-04-12 08:27:27 +0000 | [diff] [blame] | 1364 | return 0; |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1365 | } |
| 1366 | |
sjur.brandeland@stericsson.com | 39abbae | 2012-04-12 08:27:27 +0000 | [diff] [blame] | 1367 | static const struct net_device_ops cfhsi_ops = { |
| 1368 | .ndo_open = cfhsi_open, |
| 1369 | .ndo_stop = cfhsi_close, |
| 1370 | .ndo_start_xmit = cfhsi_xmit |
| 1371 | }; |
| 1372 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1373 | int cfhsi_remove(struct platform_device *pdev) |
| 1374 | { |
| 1375 | struct list_head *list_node; |
| 1376 | struct list_head *n; |
| 1377 | struct cfhsi *cfhsi = NULL; |
| 1378 | struct cfhsi_dev *dev; |
| 1379 | |
| 1380 | dev = (struct cfhsi_dev *)pdev->dev.platform_data; |
| 1381 | spin_lock(&cfhsi_list_lock); |
| 1382 | list_for_each_safe(list_node, n, &cfhsi_list) { |
| 1383 | cfhsi = list_entry(list_node, struct cfhsi, list); |
| 1384 | /* Find the corresponding device. */ |
| 1385 | if (cfhsi->dev == dev) { |
| 1386 | /* Remove from list. */ |
| 1387 | list_del(list_node); |
| 1388 | spin_unlock(&cfhsi_list_lock); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1389 | return 0; |
| 1390 | } |
| 1391 | } |
| 1392 | spin_unlock(&cfhsi_list_lock); |
| 1393 | return -ENODEV; |
| 1394 | } |
| 1395 | |
| 1396 | struct platform_driver cfhsi_plat_drv = { |
| 1397 | .probe = cfhsi_probe, |
| 1398 | .remove = cfhsi_remove, |
| 1399 | .driver = { |
| 1400 | .name = "cfhsi", |
| 1401 | .owner = THIS_MODULE, |
| 1402 | }, |
| 1403 | }; |
| 1404 | |
| 1405 | static void __exit cfhsi_exit_module(void) |
| 1406 | { |
| 1407 | struct list_head *list_node; |
| 1408 | struct list_head *n; |
| 1409 | struct cfhsi *cfhsi = NULL; |
| 1410 | |
| 1411 | spin_lock(&cfhsi_list_lock); |
| 1412 | list_for_each_safe(list_node, n, &cfhsi_list) { |
| 1413 | cfhsi = list_entry(list_node, struct cfhsi, list); |
| 1414 | |
| 1415 | /* Remove from list. */ |
| 1416 | list_del(list_node); |
| 1417 | spin_unlock(&cfhsi_list_lock); |
| 1418 | |
sjur.brandeland@stericsson.com | 39abbae | 2012-04-12 08:27:27 +0000 | [diff] [blame] | 1419 | unregister_netdevice(cfhsi->ndev); |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1420 | |
| 1421 | spin_lock(&cfhsi_list_lock); |
| 1422 | } |
| 1423 | spin_unlock(&cfhsi_list_lock); |
| 1424 | |
| 1425 | /* Unregister platform driver. */ |
| 1426 | platform_driver_unregister(&cfhsi_plat_drv); |
| 1427 | } |
| 1428 | |
| 1429 | static int __init cfhsi_init_module(void) |
| 1430 | { |
| 1431 | int result; |
| 1432 | |
| 1433 | /* Initialize spin lock. */ |
| 1434 | spin_lock_init(&cfhsi_list_lock); |
| 1435 | |
| 1436 | /* Register platform driver. */ |
| 1437 | result = platform_driver_register(&cfhsi_plat_drv); |
| 1438 | if (result) { |
| 1439 | printk(KERN_ERR "Could not register platform HSI driver: %d.\n", |
| 1440 | result); |
| 1441 | goto err_dev_register; |
| 1442 | } |
| 1443 | |
Dmitry.Tarnyagin | 40d6904 | 2011-06-01 03:29:18 +0000 | [diff] [blame] | 1444 | err_dev_register: |
| 1445 | return result; |
| 1446 | } |
| 1447 | |
| 1448 | module_init(cfhsi_init_module); |
| 1449 | module_exit(cfhsi_exit_module); |