include/linux/ti_wilink_st.h

   1 /*
   2  *  Shared Transport Header file
   3  *      To be included by the protocol stack drivers for
   4  *      Texas Instruments BT,FM and GPS combo chip drivers
   5  *      and also serves the sub-modules of the shared transport driver.
   6  *
   7  *  Copyright (C) 2009-2010 Texas Instruments
   8  *  Author: Pavan Savoy <pavan_savoy@ti.com>
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License version 2 as
  12  *  published by the Free Software Foundation.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  *
  23  */
  24
  25 #ifndef TI_WILINK_ST_H
  26 #define TI_WILINK_ST_H
  27
  28 /**
  29  * enum proto-type - The protocol on WiLink chips which share a
  30  *      common physical interface like UART.
  31  */
  32 enum proto_type {
  33         ST_BT,
  34         ST_FM,
  35         ST_GPS,
  36         ST_MAX_CHANNELS = 16,
  37 };
  38
  39 /**
  40  * struct st_proto_s - Per Protocol structure from BT/FM/GPS to ST
  41  * @type: type of the protocol being registered among the
  42  *      available proto_type(BT, FM, GPS the protocol which share TTY).
  43  * @recv: the receiver callback pointing to a function in the
  44  *      protocol drivers called by the ST driver upon receiving
  45  *      relevant data.
  46  * @match_packet: reserved for future use, to make ST more generic
  47  * @reg_complete_cb: callback handler pointing to a function in protocol
  48  *      handler called by ST when the pending registrations are complete.
  49  *      The registrations are marked pending, in situations when fw
  50  *      download is in progress.
  51  * @write: pointer to function in ST provided to protocol drivers from ST,
  52  *      to be made use when protocol drivers have data to send to TTY.
  53  * @priv_data: privdate data holder for the protocol drivers, sent
  54  *      from the protocol drivers during registration, and sent back on
  55  *      reg_complete_cb and recv.
  56  * @chnl_id: channel id the protocol driver is interested in, the channel
  57  *      id is nothing but the 1st byte of the packet in UART frame.
  58  * @max_frame_size: size of the largest frame the protocol can receive.
  59  * @hdr_len: length of the header structure of the protocol.
  60  * @offset_len_in_hdr: this provides the offset of the length field in the
  61  *      header structure of the protocol header, to assist ST to know
  62  *      how much to receive, if the data is split across UART frames.
  63  * @len_size: whether the length field inside the header is 2 bytes
  64  *      or 1 byte.
  65  * @reserve: the number of bytes ST needs to reserve in the skb being
  66  *      prepared for the protocol driver.
  67  */
  68 struct st_proto_s {
  69         enum proto_type type;
  70         long (*recv) (void *, struct sk_buff *);
  71         unsigned char (*match_packet) (const unsigned char *data);
  72         void (*reg_complete_cb) (void *, char data);
  73         long (*write) (struct sk_buff *skb);
  74         void *priv_data;
  75
  76         unsigned char chnl_id;
  77         unsigned short max_frame_size;
  78         unsigned char hdr_len;
  79         unsigned char offset_len_in_hdr;
  80         unsigned char len_size;
  81         unsigned char reserve;
  82 };
  83
  84 extern long st_register(struct st_proto_s *);
  85 extern long st_unregister(struct st_proto_s *);
  86
  87
  88 /*
  89  * header information used by st_core.c
  90  */
  91
  92 /* states of protocol list */
  93 #define ST_NOTEMPTY     1
  94 #define ST_EMPTY        0
  95
  96 /*
  97  * possible st_states
  98  */
  99 #define ST_INITIALIZING         1
 100 #define ST_REG_IN_PROGRESS      2
 101 #define ST_REG_PENDING          3
 102 #define ST_WAITING_FOR_RESP     4
 103
 104 /**
 105  * struct st_data_s - ST core internal structure
 106  * @st_state: different states of ST like initializing, registration
 107  *      in progress, this is mainly used to return relevant err codes
 108  *      when protocol drivers are registering. It is also used to track
 109  *      the recv function, as in during fw download only HCI events
 110  *      can occur , where as during other times other events CH8, CH9
 111  *      can occur.
 112  * @tty: tty provided by the TTY core for line disciplines.
 113  * @tx_skb: If for some reason the tty's write returns lesser bytes written
 114  *      then to maintain the rest of data to be written on next instance.
 115  *      This needs to be protected, hence the lock inside wakeup func.
 116  * @tx_state: if the data is being written onto the TTY and protocol driver
 117  *      wants to send more, queue up data and mark that there is
 118  *      more data to send.
 119  * @list: the list of protocols registered, only MAX can exist, one protocol
 120  *      can register only once.
 121  * @rx_state: states to be maintained inside st's tty receive
 122  * @rx_count: count to be maintained inside st's tty receieve
 123  * @rx_skb: the skb where all data for a protocol gets accumulated,
 124  *      since tty might not call receive when a complete event packet
 125  *      is received, the states, count and the skb needs to be maintained.
 126  * @rx_chnl: the channel ID for which the data is getting accumalated for.
 127  * @txq: the list of skbs which needs to be sent onto the TTY.
 128  * @tx_waitq: if the chip is not in AWAKE state, the skbs needs to be queued
 129  *      up in here, PM(WAKEUP_IND) data needs to be sent and then the skbs
 130  *      from waitq can be moved onto the txq.
 131  *      Needs locking too.
 132  * @lock: the lock to protect skbs, queues, and ST states.
 133  * @protos_registered: count of the protocols registered, also when 0 the
 134  *      chip enable gpio can be toggled, and when it changes to 1 the fw
 135  *      needs to be downloaded to initialize chip side ST.
 136  * @ll_state: the various PM states the chip can be, the states are notified
 137  *      to us, when the chip sends relevant PM packets(SLEEP_IND, WAKE_IND).
 138  * @kim_data: reference to the parent encapsulating structure.
 139  *
 140  */
 141 struct st_data_s {
 142         unsigned long st_state;
 143         struct sk_buff *tx_skb;
 144 #define ST_TX_SENDING   1
 145 #define ST_TX_WAKEUP    2
 146         unsigned long tx_state;
 147         struct st_proto_s *list[ST_MAX_CHANNELS];
 148         bool is_registered[ST_MAX_CHANNELS];
 149         unsigned long rx_state;
 150         unsigned long rx_count;
 151         struct sk_buff *rx_skb;
 152         unsigned char rx_chnl;
 153         struct sk_buff_head txq, tx_waitq;
 154         spinlock_t lock;
 155         unsigned char   protos_registered;
 156         unsigned long ll_state;
 157         void *kim_data;
 158         struct tty_struct *tty;
 159 };
 160
 161 /*
 162  * wrapper around tty->ops->write_room to check
 163  * availability during firmware download
 164  */
 165 int st_get_uart_wr_room(struct st_data_s *st_gdata);
 166 /**
 167  * st_int_write -
 168  * point this to tty->driver->write or tty->ops->write
 169  * depending upon the kernel version
 170  */
 171 int st_int_write(struct st_data_s*, const unsigned char*, int);
 172
 173 /**
 174  * st_write -
 175  * internal write function, passed onto protocol drivers
 176  * via the write function ptr of protocol struct
 177  */
 178 long st_write(struct sk_buff *);
 179
 180 /* function to be called from ST-LL */
 181 void st_ll_send_frame(enum proto_type, struct sk_buff *);
 182
 183 /* internal wake up function */
 184 void st_tx_wakeup(struct st_data_s *st_data);
 185
 186 /* init, exit entry funcs called from KIM */
 187 int st_core_init(struct st_data_s **);
 188 void st_core_exit(struct st_data_s *);
 189
 190 /* ask for reference from KIM */
 191 void st_kim_ref(struct st_data_s **, int);
 192
 193 #define GPS_STUB_TEST
 194 #ifdef GPS_STUB_TEST
 195 int gps_chrdrv_stub_write(const unsigned char*, int);
 196 void gps_chrdrv_stub_init(void);
 197 #endif
 198
 199 /*
 200  * header information used by st_kim.c
 201  */
 202
 203 /* time in msec to wait for
 204  * line discipline to be installed
 205  */
 206 #define LDISC_TIME      1000
 207 #define CMD_RESP_TIME   800
 208 #define CMD_WR_TIME     5000
 209 #define MAKEWORD(a, b)  ((unsigned short)(((unsigned char)(a)) \
 210         | ((unsigned short)((unsigned char)(b))) << 8))
 211
 212 #define GPIO_HIGH 1
 213 #define GPIO_LOW  0
 214
 215 /* the Power-On-Reset logic, requires to attempt
 216  * to download firmware onto chip more than once
 217  * since the self-test for chip takes a while
 218  */
 219 #define POR_RETRY_COUNT 5
 220
 221 /**
 222  * struct chip_version - save the chip version
 223  */
 224 struct chip_version {
 225         unsigned short full;
 226         unsigned short chip;
 227         unsigned short min_ver;
 228         unsigned short maj_ver;
 229 };
 230
 231 #define UART_DEV_NAME_LEN 32
 232 /**
 233  * struct kim_data_s - the KIM internal data, embedded as the
 234  *      platform's drv data. One for each ST device in the system.
 235  * @uim_pid: KIM needs to communicate with UIM to request to install
 236  *      the ldisc by opening UART when protocol drivers register.
 237  * @kim_pdev: the platform device added in one of the board-XX.c file
 238  *      in arch/XX/ directory, 1 for each ST device.
 239  * @kim_rcvd: completion handler to notify when data was received,
 240  *      mainly used during fw download, which involves multiple send/wait
 241  *      for each of the HCI-VS commands.
 242  * @ldisc_installed: completion handler to notify that the UIM accepted
 243  *      the request to install ldisc, notify from tty_open which suggests
 244  *      the ldisc was properly installed.
 245  * @resp_buffer: data buffer for the .bts fw file name.
 246  * @fw_entry: firmware class struct to request/release the fw.
 247  * @rx_state: the rx state for kim's receive func during fw download.
 248  * @rx_count: the rx count for the kim's receive func during fw download.
 249  * @rx_skb: all of fw data might not come at once, and hence data storage for
 250  *      whole of the fw response, only HCI_EVENTs and hence diff from ST's
 251  *      response.
 252  * @core_data: ST core's data, which mainly is the tty's disc_data
 253  * @version: chip version available via a sysfs entry.
 254  *
 255  */
 256 struct kim_data_s {
 257         long uim_pid;
 258         struct platform_device *kim_pdev;
 259         struct completion kim_rcvd, ldisc_installed;
 260         char resp_buffer[30];
 261         const struct firmware *fw_entry;
 262         long nshutdown;
 263         unsigned long rx_state;
 264         unsigned long rx_count;
 265         struct sk_buff *rx_skb;
 266         struct st_data_s *core_data;
 267         struct chip_version version;
 268         unsigned char ldisc_install;
 269         unsigned char dev_name[UART_DEV_NAME_LEN];
 270         unsigned char flow_cntrl;
 271         unsigned long baud_rate;
 272 };
 273
 274 /**
 275  * functions called when 1 of the protocol drivers gets
 276  * registered, these need to communicate with UIM to request
 277  * ldisc installed, read chip_version, download relevant fw
 278  */
 279 long st_kim_start(void *);
 280 long st_kim_stop(void *);
 281
 282 void st_kim_recv(void *, const unsigned char *, long count);
 283 void st_kim_complete(void *);
 284 void kim_st_list_protocols(struct st_data_s *, void *);
 285
 286 /*
 287  * BTS headers
 288  */
 289 #define ACTION_SEND_COMMAND     1
 290 #define ACTION_WAIT_EVENT       2
 291 #define ACTION_SERIAL           3
 292 #define ACTION_DELAY            4
 293 #define ACTION_RUN_SCRIPT       5
 294 #define ACTION_REMARKS          6
 295
 296 /**
 297  * struct bts_header - the fw file is NOT binary which can
 298  *      be sent onto TTY as is. The .bts is more a script
 299  *      file which has different types of actions.
 300  *      Each such action needs to be parsed by the KIM and
 301  *      relevant procedure to be called.
 302  */
 303 struct bts_header {
 304         u32 magic;
 305         u32 version;
 306         u8 future[24];
 307         u8 actions[0];
 308 } __attribute__ ((packed));
 309
 310 /**
 311  * struct bts_action - Each .bts action has its own type of
 312  *      data.
 313  */
 314 struct bts_action {
 315         u16 type;
 316         u16 size;
 317         u8 data[0];
 318 } __attribute__ ((packed));
 319
 320 struct bts_action_send {
 321         u8 data[0];
 322 } __attribute__ ((packed));
 323
 324 struct bts_action_wait {
 325         u32 msec;
 326         u32 size;
 327         u8 data[0];
 328 } __attribute__ ((packed));
 329
 330 struct bts_action_delay {
 331         u32 msec;
 332 } __attribute__ ((packed));
 333
 334 struct bts_action_serial {
 335         u32 baud;
 336         u32 flow_control;
 337 } __attribute__ ((packed));
 338
 339 /**
 340  * struct hci_command - the HCI-VS for intrepreting
 341  *      the change baud rate of host-side UART, which
 342  *      needs to be ignored, since UIM would do that
 343  *      when it receives request from KIM for ldisc installation.
 344  */
 345 struct hci_command {
 346         u8 prefix;
 347         u16 opcode;
 348         u8 plen;
 349         u32 speed;
 350 } __attribute__ ((packed));
 351
 352 /*
 353  * header information used by st_ll.c
 354  */
 355
 356 /* ST LL receiver states */
 357 #define ST_W4_PACKET_TYPE       0
 358 #define ST_W4_HEADER            1
 359 #define ST_W4_DATA              2
 360
 361 /* ST LL state machines */
 362 #define ST_LL_ASLEEP               0
 363 #define ST_LL_ASLEEP_TO_AWAKE      1
 364 #define ST_LL_AWAKE                2
 365 #define ST_LL_AWAKE_TO_ASLEEP      3
 366 #define ST_LL_INVALID              4
 367
 368 /* different PM notifications coming from chip */
 369 #define LL_SLEEP_IND    0x30
 370 #define LL_SLEEP_ACK    0x31
 371 #define LL_WAKE_UP_IND  0x32
 372 #define LL_WAKE_UP_ACK  0x33
 373
 374 /* initialize and de-init ST LL */
 375 long st_ll_init(struct st_data_s *);
 376 long st_ll_deinit(struct st_data_s *);
 377
 378 /**
 379  * enable/disable ST LL along with KIM start/stop
 380  * called by ST Core
 381  */
 382 void st_ll_enable(struct st_data_s *);
 383 void st_ll_disable(struct st_data_s *);
 384
 385 /**
 386  * various funcs used by ST core to set/get the various PM states
 387  * of the chip.
 388  */
 389 unsigned long st_ll_getstate(struct st_data_s *);
 390 unsigned long st_ll_sleep_state(struct st_data_s *, unsigned char);
 391 void st_ll_wakeup(struct st_data_s *);
 392
 393 /*
 394  * header information used by st_core.c for FM and GPS
 395  * packet parsing, the bluetooth headers are already available
 396  * at net/bluetooth/
 397  */
 398
 399 struct fm_event_hdr {
 400         u8 plen;
 401 } __attribute__ ((packed));
 402
 403 #define FM_MAX_FRAME_SIZE 0xFF  /* TODO: */
 404 #define FM_EVENT_HDR_SIZE 1     /* size of fm_event_hdr */
 405 #define ST_FM_CH8_PKT 0x8
 406
 407 /* gps stuff */
 408 struct gps_event_hdr {
 409         u8 opcode;
 410         u16 plen;
 411 } __attribute__ ((packed));
 412
 413 /* platform data */
 414 struct ti_st_plat_data {
 415         long nshutdown_gpio;
 416         unsigned char dev_name[UART_DEV_NAME_LEN]; /* uart name */
 417         unsigned char flow_cntrl; /* flow control flag */
 418         unsigned long baud_rate;
 419         int (*suspend)(struct platform_device *, pm_message_t);
 420         int (*resume)(struct platform_device *);
 421 };
 422
 423 #endif /* TI_WILINK_ST_H */