Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 1 | /* Copyright (c) 2011, Code Aurora Forum. All rights reserved. |
| 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License version 2 and |
| 5 | * only version 2 as published by the Free Software Foundation. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/interrupt.h> |
| 15 | #include <linux/device.h> |
| 16 | #include <linux/delay.h> |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/termios.h> |
| 19 | #include <mach/msm_smd.h> |
| 20 | #include <linux/netdevice.h> |
| 21 | #include <mach/bam_dmux.h> |
| 22 | #include <linux/debugfs.h> |
| 23 | #include <linux/bitops.h> |
| 24 | #include <linux/termios.h> |
| 25 | |
| 26 | #include "u_rmnet.h" |
| 27 | |
| 28 | #define BAM_N_PORTS 1 |
| 29 | |
| 30 | static struct workqueue_struct *gbam_wq; |
| 31 | static int n_bam_ports; |
| 32 | static unsigned bam_ch_ids[] = { 8 }; |
| 33 | |
Jack Pham | effd4ae | 2011-08-03 16:49:36 -0700 | [diff] [blame] | 34 | static const char *bam_ch_names[] = { "bam_dmux_ch_8" }; |
| 35 | |
Vamsi Krishna | 8f24f25 | 2011-11-02 11:46:08 -0700 | [diff] [blame^] | 36 | #define BAM_MUX_TX_PKT_DROP_THRESHOLD 1000 |
| 37 | #define BAM_MUX_RX_PKT_FCTRL_EN_TSHOLD 200 |
| 38 | #define BAM_MUX_RX_PKT_FCTRL_DIS_TSHOLD 125 |
| 39 | #define BAM_MUX_RX_PKT_FLOW_CTRL_SUPPORT 1 |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 40 | |
| 41 | #define BAM_MUX_HDR 8 |
| 42 | |
Vamsi Krishna | 8f24f25 | 2011-11-02 11:46:08 -0700 | [diff] [blame^] | 43 | #define BAM_MUX_RX_Q_SIZE 16 |
| 44 | #define BAM_MUX_TX_Q_SIZE 200 |
| 45 | #define BAM_MUX_RX_REQ_SIZE (2048 - BAM_MUX_HDR) |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 46 | |
Vamsi Krishna | 8f24f25 | 2011-11-02 11:46:08 -0700 | [diff] [blame^] | 47 | unsigned int bam_mux_tx_pkt_drop_thld = BAM_MUX_TX_PKT_DROP_THRESHOLD; |
| 48 | module_param(bam_mux_tx_pkt_drop_thld, uint, S_IRUGO | S_IWUSR); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 49 | |
Vamsi Krishna | 8f24f25 | 2011-11-02 11:46:08 -0700 | [diff] [blame^] | 50 | unsigned int bam_mux_rx_fctrl_en_thld = BAM_MUX_RX_PKT_FCTRL_EN_TSHOLD; |
| 51 | module_param(bam_mux_rx_fctrl_en_thld, uint, S_IRUGO | S_IWUSR); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 52 | |
Vamsi Krishna | 8f24f25 | 2011-11-02 11:46:08 -0700 | [diff] [blame^] | 53 | unsigned int bam_mux_rx_fctrl_support = BAM_MUX_RX_PKT_FLOW_CTRL_SUPPORT; |
| 54 | module_param(bam_mux_rx_fctrl_support, uint, S_IRUGO | S_IWUSR); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 55 | |
Vamsi Krishna | 8f24f25 | 2011-11-02 11:46:08 -0700 | [diff] [blame^] | 56 | unsigned int bam_mux_rx_fctrl_dis_thld = BAM_MUX_RX_PKT_FCTRL_DIS_TSHOLD; |
| 57 | module_param(bam_mux_rx_fctrl_dis_thld, uint, S_IRUGO | S_IWUSR); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 58 | |
Vamsi Krishna | 8f24f25 | 2011-11-02 11:46:08 -0700 | [diff] [blame^] | 59 | unsigned int bam_mux_tx_q_size = BAM_MUX_TX_Q_SIZE; |
| 60 | module_param(bam_mux_tx_q_size, uint, S_IRUGO | S_IWUSR); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 61 | |
Vamsi Krishna | 8f24f25 | 2011-11-02 11:46:08 -0700 | [diff] [blame^] | 62 | unsigned int bam_mux_rx_q_size = BAM_MUX_RX_Q_SIZE; |
| 63 | module_param(bam_mux_rx_q_size, uint, S_IRUGO | S_IWUSR); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 64 | |
Vamsi Krishna | 8f24f25 | 2011-11-02 11:46:08 -0700 | [diff] [blame^] | 65 | unsigned int bam_mux_rx_req_size = BAM_MUX_RX_REQ_SIZE; |
| 66 | module_param(bam_mux_rx_req_size, uint, S_IRUGO | S_IWUSR); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 67 | |
Jack Pham | effd4ae | 2011-08-03 16:49:36 -0700 | [diff] [blame] | 68 | #define BAM_CH_OPENED BIT(0) |
| 69 | #define BAM_CH_READY BIT(1) |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 70 | struct bam_ch_info { |
Jack Pham | effd4ae | 2011-08-03 16:49:36 -0700 | [diff] [blame] | 71 | unsigned long flags; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 72 | unsigned id; |
| 73 | |
| 74 | struct list_head tx_idle; |
| 75 | struct sk_buff_head tx_skb_q; |
| 76 | |
| 77 | struct list_head rx_idle; |
| 78 | struct sk_buff_head rx_skb_q; |
| 79 | |
| 80 | struct gbam_port *port; |
| 81 | struct work_struct write_tobam_w; |
| 82 | |
| 83 | /* stats */ |
| 84 | unsigned int pending_with_bam; |
| 85 | unsigned int tohost_drp_cnt; |
| 86 | unsigned int tomodem_drp_cnt; |
| 87 | unsigned int tx_len; |
| 88 | unsigned int rx_len; |
| 89 | unsigned long to_modem; |
| 90 | unsigned long to_host; |
| 91 | }; |
| 92 | |
| 93 | struct gbam_port { |
| 94 | unsigned port_num; |
| 95 | spinlock_t port_lock; |
| 96 | |
| 97 | struct grmnet *port_usb; |
| 98 | |
| 99 | struct bam_ch_info data_ch; |
| 100 | |
| 101 | struct work_struct connect_w; |
| 102 | }; |
| 103 | |
| 104 | static struct bam_portmaster { |
| 105 | struct gbam_port *port; |
Jack Pham | effd4ae | 2011-08-03 16:49:36 -0700 | [diff] [blame] | 106 | struct platform_driver pdrv; |
| 107 | } bam_ports[BAM_N_PORTS]; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 108 | |
| 109 | static void gbam_start_rx(struct gbam_port *port); |
| 110 | |
| 111 | /*---------------misc functions---------------- */ |
| 112 | static void gbam_free_requests(struct usb_ep *ep, struct list_head *head) |
| 113 | { |
| 114 | struct usb_request *req; |
| 115 | |
| 116 | while (!list_empty(head)) { |
| 117 | req = list_entry(head->next, struct usb_request, list); |
| 118 | list_del(&req->list); |
| 119 | usb_ep_free_request(ep, req); |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | static int gbam_alloc_requests(struct usb_ep *ep, struct list_head *head, |
| 124 | int num, |
| 125 | void (*cb)(struct usb_ep *ep, struct usb_request *), |
| 126 | gfp_t flags) |
| 127 | { |
| 128 | int i; |
| 129 | struct usb_request *req; |
| 130 | |
| 131 | pr_debug("%s: ep:%p head:%p num:%d cb:%p", __func__, |
| 132 | ep, head, num, cb); |
| 133 | |
| 134 | for (i = 0; i < num; i++) { |
| 135 | req = usb_ep_alloc_request(ep, flags); |
| 136 | if (!req) { |
| 137 | pr_debug("%s: req allocated:%d\n", __func__, i); |
| 138 | return list_empty(head) ? -ENOMEM : 0; |
| 139 | } |
| 140 | req->complete = cb; |
| 141 | list_add(&req->list, head); |
| 142 | } |
| 143 | |
| 144 | return 0; |
| 145 | } |
| 146 | /*--------------------------------------------- */ |
| 147 | |
| 148 | /*------------data_path----------------------------*/ |
| 149 | static void gbam_write_data_tohost(struct gbam_port *port) |
| 150 | { |
| 151 | unsigned long flags; |
| 152 | struct bam_ch_info *d = &port->data_ch; |
| 153 | struct sk_buff *skb; |
| 154 | int ret; |
| 155 | struct usb_request *req; |
| 156 | struct usb_ep *ep; |
| 157 | |
| 158 | spin_lock_irqsave(&port->port_lock, flags); |
| 159 | if (!port->port_usb) { |
| 160 | spin_unlock_irqrestore(&port->port_lock, flags); |
| 161 | return; |
| 162 | } |
| 163 | |
| 164 | ep = port->port_usb->in; |
| 165 | |
| 166 | while (!list_empty(&d->tx_idle)) { |
| 167 | skb = __skb_dequeue(&d->tx_skb_q); |
| 168 | if (!skb) { |
| 169 | spin_unlock_irqrestore(&port->port_lock, flags); |
| 170 | return; |
| 171 | } |
| 172 | req = list_first_entry(&d->tx_idle, |
| 173 | struct usb_request, |
| 174 | list); |
| 175 | req->context = skb; |
| 176 | req->buf = skb->data; |
| 177 | req->length = skb->len; |
| 178 | |
| 179 | list_del(&req->list); |
| 180 | |
| 181 | spin_unlock(&port->port_lock); |
| 182 | ret = usb_ep_queue(ep, req, GFP_ATOMIC); |
| 183 | spin_lock(&port->port_lock); |
| 184 | if (ret) { |
| 185 | pr_err("%s: usb epIn failed\n", __func__); |
| 186 | list_add(&req->list, &d->tx_idle); |
| 187 | dev_kfree_skb_any(skb); |
| 188 | break; |
| 189 | } |
| 190 | d->to_host++; |
| 191 | } |
| 192 | spin_unlock_irqrestore(&port->port_lock, flags); |
| 193 | } |
| 194 | |
| 195 | void gbam_data_recv_cb(void *p, struct sk_buff *skb) |
| 196 | { |
| 197 | struct gbam_port *port = p; |
| 198 | struct bam_ch_info *d = &port->data_ch; |
| 199 | unsigned long flags; |
| 200 | |
| 201 | if (!skb) |
| 202 | return; |
| 203 | |
| 204 | pr_debug("%s: p:%p#%d d:%p skb_len:%d\n", __func__, |
| 205 | port, port->port_num, d, skb->len); |
| 206 | |
| 207 | spin_lock_irqsave(&port->port_lock, flags); |
| 208 | if (!port->port_usb) { |
| 209 | spin_unlock_irqrestore(&port->port_lock, flags); |
| 210 | dev_kfree_skb_any(skb); |
| 211 | return; |
| 212 | } |
| 213 | |
Vamsi Krishna | 8f24f25 | 2011-11-02 11:46:08 -0700 | [diff] [blame^] | 214 | if (d->tx_skb_q.qlen > bam_mux_tx_pkt_drop_thld) { |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 215 | d->tohost_drp_cnt++; |
| 216 | if (printk_ratelimit()) |
| 217 | pr_err("%s: tx pkt dropped: tx_drop_cnt:%u\n", |
| 218 | __func__, d->tohost_drp_cnt); |
| 219 | spin_unlock_irqrestore(&port->port_lock, flags); |
| 220 | dev_kfree_skb_any(skb); |
| 221 | return; |
| 222 | } |
| 223 | |
| 224 | __skb_queue_tail(&d->tx_skb_q, skb); |
| 225 | spin_unlock_irqrestore(&port->port_lock, flags); |
| 226 | |
| 227 | gbam_write_data_tohost(port); |
| 228 | } |
| 229 | |
| 230 | void gbam_data_write_done(void *p, struct sk_buff *skb) |
| 231 | { |
| 232 | struct gbam_port *port = p; |
| 233 | struct bam_ch_info *d = &port->data_ch; |
| 234 | unsigned long flags; |
| 235 | |
| 236 | if (!skb) |
| 237 | return; |
| 238 | |
| 239 | dev_kfree_skb_any(skb); |
| 240 | |
| 241 | spin_lock_irqsave(&port->port_lock, flags); |
| 242 | |
| 243 | d->pending_with_bam--; |
| 244 | |
| 245 | pr_debug("%s: port:%p d:%p tom:%lu pbam:%u, pno:%d\n", __func__, |
| 246 | port, d, d->to_modem, |
| 247 | d->pending_with_bam, port->port_num); |
| 248 | |
Vamsi Krishna | 8f24f25 | 2011-11-02 11:46:08 -0700 | [diff] [blame^] | 249 | if (bam_mux_rx_fctrl_support && |
| 250 | d->pending_with_bam >= bam_mux_rx_fctrl_dis_thld) { |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 251 | |
| 252 | spin_unlock_irqrestore(&port->port_lock, flags); |
| 253 | return; |
| 254 | } |
| 255 | spin_unlock_irqrestore(&port->port_lock, flags); |
| 256 | |
| 257 | gbam_start_rx(port); |
| 258 | } |
| 259 | |
| 260 | static void gbam_data_write_tobam(struct work_struct *w) |
| 261 | { |
| 262 | struct gbam_port *port; |
| 263 | struct bam_ch_info *d; |
| 264 | struct sk_buff *skb; |
| 265 | unsigned long flags; |
| 266 | int ret; |
| 267 | |
| 268 | d = container_of(w, struct bam_ch_info, write_tobam_w); |
| 269 | port = d->port; |
| 270 | |
| 271 | spin_lock_irqsave(&port->port_lock, flags); |
| 272 | if (!port->port_usb) { |
| 273 | spin_unlock_irqrestore(&port->port_lock, flags); |
| 274 | return; |
| 275 | } |
| 276 | |
| 277 | while ((skb = __skb_dequeue(&d->rx_skb_q))) { |
| 278 | d->pending_with_bam++; |
| 279 | d->to_modem++; |
| 280 | |
| 281 | pr_debug("%s: port:%p d:%p tom:%lu pbam:%u pno:%d\n", __func__, |
| 282 | port, d, d->to_modem, d->pending_with_bam, |
| 283 | port->port_num); |
| 284 | |
| 285 | spin_unlock_irqrestore(&port->port_lock, flags); |
| 286 | ret = msm_bam_dmux_write(d->id, skb); |
| 287 | spin_lock_irqsave(&port->port_lock, flags); |
| 288 | if (ret) { |
| 289 | pr_debug("%s: write error:%d\n", __func__, ret); |
| 290 | d->pending_with_bam--; |
| 291 | d->to_modem--; |
| 292 | d->tomodem_drp_cnt++; |
| 293 | dev_kfree_skb_any(skb); |
| 294 | break; |
| 295 | } |
| 296 | } |
| 297 | spin_unlock_irqrestore(&port->port_lock, flags); |
| 298 | } |
| 299 | /*-------------------------------------------------------------*/ |
| 300 | |
| 301 | static void gbam_epin_complete(struct usb_ep *ep, struct usb_request *req) |
| 302 | { |
| 303 | struct gbam_port *port = ep->driver_data; |
| 304 | struct bam_ch_info *d; |
| 305 | struct sk_buff *skb = req->context; |
| 306 | int status = req->status; |
| 307 | |
| 308 | switch (status) { |
| 309 | case 0: |
| 310 | /* successful completion */ |
| 311 | case -ECONNRESET: |
| 312 | case -ESHUTDOWN: |
| 313 | /* connection gone */ |
| 314 | break; |
| 315 | default: |
| 316 | pr_err("%s: data tx ep error %d\n", |
| 317 | __func__, status); |
| 318 | break; |
| 319 | } |
| 320 | |
| 321 | dev_kfree_skb_any(skb); |
| 322 | |
| 323 | if (!port) |
| 324 | return; |
| 325 | |
| 326 | spin_lock(&port->port_lock); |
| 327 | d = &port->data_ch; |
| 328 | list_add_tail(&req->list, &d->tx_idle); |
| 329 | spin_unlock(&port->port_lock); |
| 330 | |
| 331 | gbam_write_data_tohost(port); |
| 332 | } |
| 333 | |
| 334 | static void |
| 335 | gbam_epout_complete(struct usb_ep *ep, struct usb_request *req) |
| 336 | { |
| 337 | struct gbam_port *port = ep->driver_data; |
| 338 | struct bam_ch_info *d = &port->data_ch; |
| 339 | struct sk_buff *skb = req->context; |
| 340 | int status = req->status; |
| 341 | int queue = 0; |
| 342 | |
| 343 | switch (status) { |
| 344 | case 0: |
| 345 | skb_put(skb, req->actual); |
| 346 | queue = 1; |
| 347 | break; |
| 348 | case -ECONNRESET: |
| 349 | case -ESHUTDOWN: |
| 350 | /* cable disconnection */ |
| 351 | dev_kfree_skb_any(skb); |
| 352 | req->buf = 0; |
| 353 | usb_ep_free_request(ep, req); |
| 354 | return; |
| 355 | default: |
| 356 | if (printk_ratelimit()) |
| 357 | pr_err("%s: %s response error %d, %d/%d\n", |
| 358 | __func__, ep->name, status, |
| 359 | req->actual, req->length); |
| 360 | dev_kfree_skb_any(skb); |
| 361 | break; |
| 362 | } |
| 363 | |
| 364 | spin_lock(&port->port_lock); |
| 365 | if (queue) { |
| 366 | __skb_queue_tail(&d->rx_skb_q, skb); |
| 367 | queue_work(gbam_wq, &d->write_tobam_w); |
| 368 | } |
| 369 | |
| 370 | /* TODO: Handle flow control gracefully by having |
| 371 | * having call back mechanism from bam driver |
| 372 | */ |
Vamsi Krishna | 8f24f25 | 2011-11-02 11:46:08 -0700 | [diff] [blame^] | 373 | if (bam_mux_rx_fctrl_support && |
| 374 | d->pending_with_bam >= bam_mux_rx_fctrl_en_thld) { |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 375 | |
| 376 | list_add_tail(&req->list, &d->rx_idle); |
| 377 | spin_unlock(&port->port_lock); |
| 378 | return; |
| 379 | } |
| 380 | spin_unlock(&port->port_lock); |
| 381 | |
Vamsi Krishna | 8f24f25 | 2011-11-02 11:46:08 -0700 | [diff] [blame^] | 382 | skb = alloc_skb(bam_mux_rx_req_size + BAM_MUX_HDR, GFP_ATOMIC); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 383 | if (!skb) { |
| 384 | spin_lock(&port->port_lock); |
| 385 | list_add_tail(&req->list, &d->rx_idle); |
| 386 | spin_unlock(&port->port_lock); |
| 387 | return; |
| 388 | } |
| 389 | skb_reserve(skb, BAM_MUX_HDR); |
| 390 | |
| 391 | req->buf = skb->data; |
Vamsi Krishna | 8f24f25 | 2011-11-02 11:46:08 -0700 | [diff] [blame^] | 392 | req->length = bam_mux_rx_req_size; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 393 | req->context = skb; |
| 394 | |
| 395 | status = usb_ep_queue(ep, req, GFP_ATOMIC); |
| 396 | if (status) { |
| 397 | dev_kfree_skb_any(skb); |
| 398 | |
| 399 | if (printk_ratelimit()) |
| 400 | pr_err("%s: data rx enqueue err %d\n", |
| 401 | __func__, status); |
| 402 | |
| 403 | spin_lock(&port->port_lock); |
| 404 | list_add_tail(&req->list, &d->rx_idle); |
| 405 | spin_unlock(&port->port_lock); |
| 406 | } |
| 407 | } |
| 408 | |
| 409 | static void gbam_start_rx(struct gbam_port *port) |
| 410 | { |
| 411 | struct usb_request *req; |
| 412 | struct bam_ch_info *d; |
| 413 | struct usb_ep *ep; |
| 414 | unsigned long flags; |
| 415 | int ret; |
| 416 | struct sk_buff *skb; |
| 417 | |
| 418 | spin_lock_irqsave(&port->port_lock, flags); |
| 419 | if (!port->port_usb) { |
| 420 | spin_unlock_irqrestore(&port->port_lock, flags); |
| 421 | return; |
| 422 | } |
| 423 | |
| 424 | d = &port->data_ch; |
| 425 | ep = port->port_usb->out; |
| 426 | |
| 427 | while (port->port_usb && !list_empty(&d->rx_idle)) { |
| 428 | req = list_first_entry(&d->rx_idle, struct usb_request, list); |
| 429 | |
Vamsi Krishna | 8f24f25 | 2011-11-02 11:46:08 -0700 | [diff] [blame^] | 430 | skb = alloc_skb(bam_mux_rx_req_size + BAM_MUX_HDR, GFP_ATOMIC); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 431 | if (!skb) |
| 432 | break; |
| 433 | skb_reserve(skb, BAM_MUX_HDR); |
| 434 | |
| 435 | list_del(&req->list); |
| 436 | req->buf = skb->data; |
Vamsi Krishna | 8f24f25 | 2011-11-02 11:46:08 -0700 | [diff] [blame^] | 437 | req->length = bam_mux_rx_req_size; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 438 | req->context = skb; |
| 439 | |
| 440 | spin_unlock_irqrestore(&port->port_lock, flags); |
| 441 | ret = usb_ep_queue(ep, req, GFP_ATOMIC); |
| 442 | spin_lock_irqsave(&port->port_lock, flags); |
| 443 | if (ret) { |
| 444 | dev_kfree_skb_any(skb); |
| 445 | |
| 446 | if (printk_ratelimit()) |
| 447 | pr_err("%s: rx queue failed\n", __func__); |
| 448 | |
| 449 | if (port->port_usb) |
| 450 | list_add(&req->list, &d->rx_idle); |
| 451 | else |
| 452 | usb_ep_free_request(ep, req); |
| 453 | break; |
| 454 | } |
| 455 | } |
| 456 | spin_unlock_irqrestore(&port->port_lock, flags); |
| 457 | } |
| 458 | |
| 459 | static void gbam_start_io(struct gbam_port *port) |
| 460 | { |
| 461 | unsigned long flags; |
| 462 | struct usb_ep *ep; |
| 463 | int ret; |
| 464 | struct bam_ch_info *d; |
| 465 | |
| 466 | pr_debug("%s: port:%p\n", __func__, port); |
| 467 | |
| 468 | spin_lock_irqsave(&port->port_lock, flags); |
| 469 | if (!port->port_usb) { |
| 470 | spin_unlock_irqrestore(&port->port_lock, flags); |
| 471 | return; |
| 472 | } |
| 473 | |
| 474 | d = &port->data_ch; |
| 475 | ep = port->port_usb->out; |
Vamsi Krishna | 8f24f25 | 2011-11-02 11:46:08 -0700 | [diff] [blame^] | 476 | ret = gbam_alloc_requests(ep, &d->rx_idle, bam_mux_rx_q_size, |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 477 | gbam_epout_complete, GFP_ATOMIC); |
| 478 | if (ret) { |
| 479 | pr_err("%s: rx req allocation failed\n", __func__); |
| 480 | return; |
| 481 | } |
| 482 | |
| 483 | ep = port->port_usb->in; |
Vamsi Krishna | 8f24f25 | 2011-11-02 11:46:08 -0700 | [diff] [blame^] | 484 | ret = gbam_alloc_requests(ep, &d->tx_idle, bam_mux_tx_q_size, |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 485 | gbam_epin_complete, GFP_ATOMIC); |
| 486 | if (ret) { |
| 487 | pr_err("%s: tx req allocation failed\n", __func__); |
| 488 | gbam_free_requests(ep, &d->rx_idle); |
| 489 | return; |
| 490 | } |
| 491 | |
| 492 | spin_unlock_irqrestore(&port->port_lock, flags); |
| 493 | |
| 494 | /* queue out requests */ |
| 495 | gbam_start_rx(port); |
| 496 | } |
| 497 | |
Jeff Hugo | 1c4531c | 2011-08-02 14:55:37 -0600 | [diff] [blame] | 498 | static void gbam_notify(void *p, int event, unsigned long data) |
| 499 | { |
| 500 | switch (event) { |
| 501 | case BAM_DMUX_RECEIVE: |
| 502 | gbam_data_recv_cb(p, (struct sk_buff *)(data)); |
| 503 | break; |
| 504 | case BAM_DMUX_WRITE_DONE: |
| 505 | gbam_data_write_done(p, (struct sk_buff *)(data)); |
| 506 | break; |
| 507 | } |
| 508 | } |
| 509 | |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 510 | static void gbam_connect_work(struct work_struct *w) |
| 511 | { |
| 512 | struct gbam_port *port = container_of(w, struct gbam_port, connect_w); |
| 513 | struct bam_ch_info *d = &port->data_ch; |
| 514 | int ret; |
| 515 | |
Jack Pham | effd4ae | 2011-08-03 16:49:36 -0700 | [diff] [blame] | 516 | if (!test_bit(BAM_CH_READY, &d->flags)) |
| 517 | return; |
| 518 | |
Jeff Hugo | 1c4531c | 2011-08-02 14:55:37 -0600 | [diff] [blame] | 519 | ret = msm_bam_dmux_open(d->id, port, gbam_notify); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 520 | if (ret) { |
| 521 | pr_err("%s: unable open bam ch:%d err:%d\n", |
| 522 | __func__, d->id, ret); |
| 523 | return; |
| 524 | } |
Jack Pham | effd4ae | 2011-08-03 16:49:36 -0700 | [diff] [blame] | 525 | set_bit(BAM_CH_OPENED, &d->flags); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 526 | |
| 527 | gbam_start_io(port); |
| 528 | |
| 529 | pr_debug("%s: done\n", __func__); |
| 530 | } |
| 531 | |
Jack Pham | effd4ae | 2011-08-03 16:49:36 -0700 | [diff] [blame] | 532 | static void gbam_free_buffers(struct gbam_port *port) |
| 533 | { |
| 534 | struct sk_buff *skb; |
| 535 | unsigned long flags; |
| 536 | struct bam_ch_info *d; |
| 537 | |
| 538 | spin_lock_irqsave(&port->port_lock, flags); |
| 539 | |
| 540 | if (!port || !port->port_usb) |
| 541 | goto free_buf_out; |
| 542 | |
| 543 | d = &port->data_ch; |
| 544 | |
| 545 | gbam_free_requests(port->port_usb->in, &d->tx_idle); |
| 546 | gbam_free_requests(port->port_usb->out, &d->rx_idle); |
| 547 | |
| 548 | while ((skb = __skb_dequeue(&d->tx_skb_q))) |
| 549 | dev_kfree_skb_any(skb); |
| 550 | |
| 551 | while ((skb = __skb_dequeue(&d->rx_skb_q))) |
| 552 | dev_kfree_skb_any(skb); |
| 553 | |
| 554 | free_buf_out: |
| 555 | spin_unlock_irqrestore(&port->port_lock, flags); |
| 556 | } |
| 557 | |
| 558 | /* BAM data channel ready, allow attempt to open */ |
| 559 | static int gbam_data_ch_probe(struct platform_device *pdev) |
| 560 | { |
| 561 | struct gbam_port *port; |
| 562 | struct bam_ch_info *d; |
| 563 | int i; |
| 564 | unsigned long flags; |
| 565 | |
| 566 | pr_debug("%s: name:%s\n", __func__, pdev->name); |
| 567 | |
| 568 | for (i = 0; i < n_bam_ports; i++) { |
| 569 | port = bam_ports[i].port; |
| 570 | d = &port->data_ch; |
| 571 | |
| 572 | if (!strncmp(bam_ch_names[i], pdev->name, |
| 573 | BAM_DMUX_CH_NAME_MAX_LEN)) { |
| 574 | set_bit(BAM_CH_READY, &d->flags); |
| 575 | |
| 576 | /* if usb is online, try opening bam_ch */ |
| 577 | spin_lock_irqsave(&port->port_lock, flags); |
| 578 | if (port->port_usb) |
| 579 | queue_work(gbam_wq, &port->connect_w); |
| 580 | spin_unlock_irqrestore(&port->port_lock, flags); |
| 581 | |
| 582 | break; |
| 583 | } |
| 584 | } |
| 585 | |
| 586 | return 0; |
| 587 | } |
| 588 | |
| 589 | /* BAM data channel went inactive, so close it */ |
| 590 | static int gbam_data_ch_remove(struct platform_device *pdev) |
| 591 | { |
| 592 | struct gbam_port *port; |
| 593 | struct bam_ch_info *d; |
| 594 | struct usb_ep *ep_in = NULL; |
| 595 | struct usb_ep *ep_out = NULL; |
| 596 | unsigned long flags; |
| 597 | int i; |
| 598 | |
| 599 | pr_debug("%s: name:%s\n", __func__, pdev->name); |
| 600 | |
| 601 | for (i = 0; i < n_bam_ports; i++) { |
| 602 | if (!strncmp(bam_ch_names[i], pdev->name, |
| 603 | BAM_DMUX_CH_NAME_MAX_LEN)) { |
| 604 | port = bam_ports[i].port; |
| 605 | d = &port->data_ch; |
| 606 | |
| 607 | spin_lock_irqsave(&port->port_lock, flags); |
| 608 | if (port->port_usb) { |
| 609 | ep_in = port->port_usb->in; |
| 610 | ep_out = port->port_usb->out; |
| 611 | } |
| 612 | spin_unlock_irqrestore(&port->port_lock, flags); |
| 613 | |
| 614 | if (ep_in) |
| 615 | usb_ep_fifo_flush(ep_in); |
| 616 | if (ep_out) |
| 617 | usb_ep_fifo_flush(ep_out); |
| 618 | |
| 619 | gbam_free_buffers(port); |
| 620 | |
| 621 | msm_bam_dmux_close(d->id); |
| 622 | |
| 623 | clear_bit(BAM_CH_READY, &d->flags); |
| 624 | clear_bit(BAM_CH_OPENED, &d->flags); |
| 625 | } |
| 626 | } |
| 627 | |
| 628 | return 0; |
| 629 | } |
| 630 | |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 631 | static void gbam_port_free(int portno) |
| 632 | { |
| 633 | struct gbam_port *port = bam_ports[portno].port; |
Jack Pham | effd4ae | 2011-08-03 16:49:36 -0700 | [diff] [blame] | 634 | struct platform_driver *pdrv = &bam_ports[portno].pdrv; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 635 | |
Jack Pham | effd4ae | 2011-08-03 16:49:36 -0700 | [diff] [blame] | 636 | if (port) { |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 637 | kfree(port); |
Jack Pham | effd4ae | 2011-08-03 16:49:36 -0700 | [diff] [blame] | 638 | platform_driver_unregister(pdrv); |
| 639 | } |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 640 | } |
| 641 | |
| 642 | static int gbam_port_alloc(int portno) |
| 643 | { |
| 644 | struct gbam_port *port; |
| 645 | struct bam_ch_info *d; |
Jack Pham | effd4ae | 2011-08-03 16:49:36 -0700 | [diff] [blame] | 646 | struct platform_driver *pdrv; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 647 | |
| 648 | port = kzalloc(sizeof(struct gbam_port), GFP_KERNEL); |
| 649 | if (!port) |
| 650 | return -ENOMEM; |
| 651 | |
| 652 | port->port_num = portno; |
| 653 | |
| 654 | /* port initialization */ |
| 655 | spin_lock_init(&port->port_lock); |
| 656 | INIT_WORK(&port->connect_w, gbam_connect_work); |
| 657 | |
| 658 | /* data ch */ |
| 659 | d = &port->data_ch; |
| 660 | d->port = port; |
| 661 | INIT_LIST_HEAD(&d->tx_idle); |
| 662 | INIT_LIST_HEAD(&d->rx_idle); |
| 663 | INIT_WORK(&d->write_tobam_w, gbam_data_write_tobam); |
| 664 | skb_queue_head_init(&d->tx_skb_q); |
| 665 | skb_queue_head_init(&d->rx_skb_q); |
| 666 | d->id = bam_ch_ids[portno]; |
| 667 | |
| 668 | bam_ports[portno].port = port; |
| 669 | |
Jack Pham | effd4ae | 2011-08-03 16:49:36 -0700 | [diff] [blame] | 670 | pdrv = &bam_ports[portno].pdrv; |
| 671 | pdrv->probe = gbam_data_ch_probe; |
| 672 | pdrv->remove = gbam_data_ch_remove; |
| 673 | pdrv->driver.name = bam_ch_names[portno]; |
| 674 | pdrv->driver.owner = THIS_MODULE; |
| 675 | |
| 676 | platform_driver_register(pdrv); |
| 677 | |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 678 | pr_debug("%s: port:%p portno:%d\n", __func__, port, portno); |
| 679 | |
| 680 | return 0; |
| 681 | } |
| 682 | |
| 683 | #if defined(CONFIG_DEBUG_FS) |
| 684 | #define DEBUG_BUF_SIZE 1024 |
| 685 | static ssize_t gbam_read_stats(struct file *file, char __user *ubuf, |
| 686 | size_t count, loff_t *ppos) |
| 687 | { |
| 688 | struct gbam_port *port; |
| 689 | struct bam_ch_info *d; |
| 690 | char *buf; |
| 691 | unsigned long flags; |
| 692 | int ret; |
| 693 | int i; |
| 694 | int temp = 0; |
| 695 | |
| 696 | buf = kzalloc(sizeof(char) * DEBUG_BUF_SIZE, GFP_KERNEL); |
| 697 | if (!buf) |
| 698 | return -ENOMEM; |
| 699 | |
| 700 | for (i = 0; i < n_bam_ports; i++) { |
| 701 | port = bam_ports[i].port; |
| 702 | if (!port) |
| 703 | continue; |
| 704 | spin_lock_irqsave(&port->port_lock, flags); |
| 705 | |
| 706 | d = &port->data_ch; |
| 707 | |
| 708 | temp += scnprintf(buf + temp, DEBUG_BUF_SIZE - temp, |
| 709 | "#PORT:%d port:%p data_ch:%p#\n" |
| 710 | "dpkts_to_usbhost: %lu\n" |
| 711 | "dpkts_to_modem: %lu\n" |
| 712 | "dpkts_pwith_bam: %u\n" |
| 713 | "to_usbhost_dcnt: %u\n" |
| 714 | "tomodem__dcnt: %u\n" |
| 715 | "tx_buf_len: %u\n" |
Jack Pham | effd4ae | 2011-08-03 16:49:36 -0700 | [diff] [blame] | 716 | "data_ch_open: %d\n" |
| 717 | "data_ch_ready: %d\n", |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 718 | i, port, &port->data_ch, |
| 719 | d->to_host, d->to_modem, |
| 720 | d->pending_with_bam, |
| 721 | d->tohost_drp_cnt, d->tomodem_drp_cnt, |
Jack Pham | effd4ae | 2011-08-03 16:49:36 -0700 | [diff] [blame] | 722 | d->tx_skb_q.qlen, |
| 723 | test_bit(BAM_CH_OPENED, &d->flags), |
| 724 | test_bit(BAM_CH_READY, &d->flags)); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 725 | |
| 726 | spin_unlock_irqrestore(&port->port_lock, flags); |
| 727 | } |
| 728 | |
| 729 | ret = simple_read_from_buffer(ubuf, count, ppos, buf, temp); |
| 730 | |
| 731 | kfree(buf); |
| 732 | |
| 733 | return ret; |
| 734 | } |
| 735 | |
| 736 | static ssize_t gbam_reset_stats(struct file *file, const char __user *buf, |
| 737 | size_t count, loff_t *ppos) |
| 738 | { |
| 739 | struct gbam_port *port; |
| 740 | struct bam_ch_info *d; |
| 741 | int i; |
| 742 | unsigned long flags; |
| 743 | |
| 744 | for (i = 0; i < n_bam_ports; i++) { |
| 745 | port = bam_ports[i].port; |
| 746 | if (!port) |
| 747 | continue; |
| 748 | |
| 749 | spin_lock_irqsave(&port->port_lock, flags); |
| 750 | |
| 751 | d = &port->data_ch; |
| 752 | |
| 753 | d->to_host = 0; |
| 754 | d->to_modem = 0; |
| 755 | d->pending_with_bam = 0; |
| 756 | d->tohost_drp_cnt = 0; |
| 757 | d->tomodem_drp_cnt = 0; |
| 758 | |
| 759 | spin_unlock_irqrestore(&port->port_lock, flags); |
| 760 | } |
| 761 | return count; |
| 762 | } |
| 763 | |
| 764 | const struct file_operations gbam_stats_ops = { |
| 765 | .read = gbam_read_stats, |
| 766 | .write = gbam_reset_stats, |
| 767 | }; |
| 768 | |
| 769 | static void gbam_debugfs_init(void) |
| 770 | { |
| 771 | struct dentry *dent; |
| 772 | struct dentry *dfile; |
| 773 | |
| 774 | dent = debugfs_create_dir("usb_rmnet", 0); |
| 775 | if (IS_ERR(dent)) |
| 776 | return; |
| 777 | |
| 778 | /* TODO: Implement cleanup function to remove created file */ |
| 779 | dfile = debugfs_create_file("status", 0444, dent, 0, &gbam_stats_ops); |
| 780 | if (!dfile || IS_ERR(dfile)) |
| 781 | debugfs_remove(dent); |
| 782 | } |
| 783 | #else |
| 784 | static void gam_debugfs_init(void) { } |
| 785 | #endif |
| 786 | |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 787 | void gbam_disconnect(struct grmnet *gr, u8 port_num) |
| 788 | { |
| 789 | struct gbam_port *port; |
| 790 | unsigned long flags; |
| 791 | struct bam_ch_info *d; |
| 792 | |
| 793 | pr_debug("%s: grmnet:%p port#%d\n", __func__, gr, port_num); |
| 794 | |
| 795 | if (port_num >= n_bam_ports) { |
| 796 | pr_err("%s: invalid portno#%d\n", __func__, port_num); |
| 797 | return; |
| 798 | } |
| 799 | |
| 800 | if (!gr) { |
| 801 | pr_err("%s: grmnet port is null\n", __func__); |
| 802 | return; |
| 803 | } |
| 804 | |
| 805 | port = bam_ports[port_num].port; |
| 806 | d = &port->data_ch; |
| 807 | |
| 808 | gbam_free_buffers(port); |
| 809 | |
| 810 | spin_lock_irqsave(&port->port_lock, flags); |
| 811 | port->port_usb = 0; |
| 812 | spin_unlock_irqrestore(&port->port_lock, flags); |
| 813 | |
| 814 | /* disable endpoints */ |
| 815 | usb_ep_disable(gr->out); |
| 816 | usb_ep_disable(gr->in); |
| 817 | |
Jack Pham | effd4ae | 2011-08-03 16:49:36 -0700 | [diff] [blame] | 818 | if (test_bit(BAM_CH_OPENED, &d->flags)) { |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 819 | msm_bam_dmux_close(d->id); |
Jack Pham | effd4ae | 2011-08-03 16:49:36 -0700 | [diff] [blame] | 820 | clear_bit(BAM_CH_OPENED, &d->flags); |
| 821 | } |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 822 | } |
| 823 | |
| 824 | int gbam_connect(struct grmnet *gr, u8 port_num) |
| 825 | { |
| 826 | struct gbam_port *port; |
| 827 | struct bam_ch_info *d; |
| 828 | int ret; |
| 829 | unsigned long flags; |
| 830 | |
| 831 | pr_debug("%s: grmnet:%p port#%d\n", __func__, gr, port_num); |
| 832 | |
| 833 | if (port_num >= n_bam_ports) { |
| 834 | pr_err("%s: invalid portno#%d\n", __func__, port_num); |
| 835 | return -ENODEV; |
| 836 | } |
| 837 | |
| 838 | if (!gr) { |
| 839 | pr_err("%s: grmnet port is null\n", __func__); |
| 840 | return -ENODEV; |
| 841 | } |
| 842 | |
| 843 | port = bam_ports[port_num].port; |
| 844 | d = &port->data_ch; |
| 845 | |
| 846 | ret = usb_ep_enable(gr->in, gr->in_desc); |
| 847 | if (ret) { |
| 848 | pr_err("%s: usb_ep_enable failed eptype:IN ep:%p", |
| 849 | __func__, gr->in); |
| 850 | return ret; |
| 851 | } |
| 852 | gr->in->driver_data = port; |
| 853 | |
| 854 | ret = usb_ep_enable(gr->out, gr->out_desc); |
| 855 | if (ret) { |
| 856 | pr_err("%s: usb_ep_enable failed eptype:OUT ep:%p", |
| 857 | __func__, gr->out); |
| 858 | gr->in->driver_data = 0; |
| 859 | return ret; |
| 860 | } |
| 861 | gr->out->driver_data = port; |
| 862 | |
| 863 | spin_lock_irqsave(&port->port_lock, flags); |
| 864 | port->port_usb = gr; |
| 865 | |
| 866 | d->to_host = 0; |
| 867 | d->to_modem = 0; |
| 868 | d->pending_with_bam = 0; |
| 869 | d->tohost_drp_cnt = 0; |
| 870 | d->tomodem_drp_cnt = 0; |
| 871 | spin_unlock_irqrestore(&port->port_lock, flags); |
| 872 | |
| 873 | |
| 874 | queue_work(gbam_wq, &port->connect_w); |
| 875 | |
| 876 | return 0; |
| 877 | } |
| 878 | |
| 879 | int gbam_setup(unsigned int count) |
| 880 | { |
| 881 | int i; |
| 882 | int ret; |
| 883 | |
| 884 | pr_debug("%s: requested ports:%d\n", __func__, count); |
| 885 | |
| 886 | if (!count || count > BAM_N_PORTS) { |
| 887 | pr_err("%s: Invalid num of ports count:%d\n", |
| 888 | __func__, count); |
| 889 | return -EINVAL; |
| 890 | } |
| 891 | |
| 892 | gbam_wq = alloc_workqueue("k_gbam", WQ_UNBOUND | WQ_MEM_RECLAIM, 1); |
| 893 | if (!gbam_wq) { |
| 894 | pr_err("%s: Unable to create workqueue gbam_wq\n", |
| 895 | __func__); |
| 896 | return -ENOMEM; |
| 897 | } |
| 898 | |
| 899 | for (i = 0; i < count; i++) { |
Manu Gautam | d59b5d3 | 2011-09-09 14:47:08 +0530 | [diff] [blame] | 900 | n_bam_ports++; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 901 | ret = gbam_port_alloc(i); |
| 902 | if (ret) { |
Manu Gautam | d59b5d3 | 2011-09-09 14:47:08 +0530 | [diff] [blame] | 903 | n_bam_ports--; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 904 | pr_err("%s: Unable to alloc port:%d\n", __func__, i); |
| 905 | goto free_bam_ports; |
| 906 | } |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 907 | } |
| 908 | |
| 909 | gbam_debugfs_init(); |
| 910 | |
| 911 | return 0; |
| 912 | free_bam_ports: |
| 913 | for (i = 0; i < n_bam_ports; i++) |
| 914 | gbam_port_free(i); |
| 915 | |
| 916 | destroy_workqueue(gbam_wq); |
| 917 | |
| 918 | return ret; |
| 919 | } |