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 #include <linux/skbuff.h>
  29
  30 /**
  31  * enum proto-type - The protocol on WiLink chips which share a
  32  *      common physical interface like UART.
  33  */
  34 enum proto_type {
  35         ST_BT,
  36         ST_FM,
  37         ST_GPS,
  38         ST_MAX_CHANNELS = 16,
  39 };
  40
  41 /**
  42  * struct st_proto_s - Per Protocol structure from BT/FM/GPS to ST
  43  * @type: type of the protocol being registered among the
  44  *      available proto_type(BT, FM, GPS the protocol which share TTY).
  45  * @recv: the receiver callback pointing to a function in the
  46  *      protocol drivers called by the ST driver upon receiving
  47  *      relevant data.
  48  * @match_packet: reserved for future use, to make ST more generic
  49  * @reg_complete_cb: callback handler pointing to a function in protocol
  50  *      handler called by ST when the pending registrations are complete.
  51  *      The registrations are marked pending, in situations when fw
  52  *      download is in progress.
  53  * @write: pointer to function in ST provided to protocol drivers from ST,
  54  *      to be made use when protocol drivers have data to send to TTY.
  55  * @priv_data: privdate data holder for the protocol drivers, sent
  56  *      from the protocol drivers during registration, and sent back on
  57  *      reg_complete_cb and recv.
  58  * @chnl_id: channel id the protocol driver is interested in, the channel
  59  *      id is nothing but the 1st byte of the packet in UART frame.
  60  * @max_frame_size: size of the largest frame the protocol can receive.
  61  * @hdr_len: length of the header structure of the protocol.
  62  * @offset_len_in_hdr: this provides the offset of the length field in the
  63  *      header structure of the protocol header, to assist ST to know
  64  *      how much to receive, if the data is split across UART frames.
  65  * @len_size: whether the length field inside the header is 2 bytes
  66  *      or 1 byte.
  67  * @reserve: the number of bytes ST needs to reserve in the skb being
  68  *      prepared for the protocol driver.
  69  */
  70 struct st_proto_s {
  71         enum proto_type type;
  72         long (*recv) (void *, struct sk_buff *);
  73         unsigned char (*match_packet) (const unsigned char *data);
  74         void (*reg_complete_cb) (void *, char data);
  75         long (*write) (struct sk_buff *skb);
  76         void *priv_data;
  77
  78         unsigned char chnl_id;
  79         unsigned short max_frame_size;
  80         unsigned char hdr_len;
  81         unsigned char offset_len_in_hdr;
  82         unsigned char len_size;
  83         unsigned char reserve;
  84 };
  85
  86 extern long st_register(struct st_proto_s *);
  87 extern long st_unregister(struct st_proto_s *);
  88
  89
  90 /*
  91  * header information used by st_core.c
  92  */
  93
  94 /* states of protocol list */
  95 #define ST_NOTEMPTY     1
  96 #define ST_EMPTY        0
  97
  98 /*
  99  * possible st_states
 100  */
 101 #define ST_INITIALIZING         1
 102 #define ST_REG_IN_PROGRESS      2
 103 #define ST_REG_PENDING          3
 104 #define ST_WAITING_FOR_RESP     4
 105
 106 /**
 107  * struct st_data_s - ST core internal structure
 108  * @st_state: different states of ST like initializing, registration
 109  *      in progress, this is mainly used to return relevant err codes
 110  *      when protocol drivers are registering. It is also used to track
 111  *      the recv function, as in during fw download only HCI events
 112  *      can occur , where as during other times other events CH8, CH9
 113  *      can occur.
 114  * @tty: tty provided by the TTY core for line disciplines.
 115  * @tx_skb: If for some reason the tty's write returns lesser bytes written
 116  *      then to maintain the rest of data to be written on next instance.
 117  *      This needs to be protected, hence the lock inside wakeup func.
 118  * @tx_state: if the data is being written onto the TTY and protocol driver
 119  *      wants to send more, queue up data and mark that there is
 120  *      more data to send.
 121  * @list: the list of protocols registered, only MAX can exist, one protocol
 122  *      can register only once.
 123  * @rx_state: states to be maintained inside st's tty receive
 124  * @rx_count: count to be maintained inside st's tty receieve
 125  * @rx_skb: the skb where all data for a protocol gets accumulated,
 126  *      since tty might not call receive when a complete event packet
 127  *      is received, the states, count and the skb needs to be maintained.
 128  * @rx_chnl: the channel ID for which the data is getting accumalated for.
 129  * @txq: the list of skbs which needs to be sent onto the TTY.
 130  * @tx_waitq: if the chip is not in AWAKE state, the skbs needs to be queued
 131  *      up in here, PM(WAKEUP_IND) data needs to be sent and then the skbs
 132  *      from waitq can be moved onto the txq.
 133  *      Needs locking too.
 134  * @lock: the lock to protect skbs, queues, and ST states.
 135  * @protos_registered: count of the protocols registered, also when 0 the
 136  *      chip enable gpio can be toggled, and when it changes to 1 the fw
 137  *      needs to be downloaded to initialize chip side ST.
 138  * @ll_state: the various PM states the chip can be, the states are notified
 139  *      to us, when the chip sends relevant PM packets(SLEEP_IND, WAKE_IND).
 140  * @kim_data: reference to the parent encapsulating structure.
 141  *
 142  */
 143 struct st_data_s {
 144         unsigned long st_state;
 145         struct sk_buff *tx_skb;
 146 #define ST_TX_SENDING   1
 147 #define ST_TX_WAKEUP    2
 148         unsigned long tx_state;
 149         struct st_proto_s *list[ST_MAX_CHANNELS];
 150         bool is_registered[ST_MAX_CHANNELS];
 151         unsigned long rx_state;
 152         unsigned long rx_count;
 153         struct sk_buff *rx_skb;
 154         unsigned char rx_chnl;
 155         struct sk_buff_head txq, tx_waitq;
 156         spinlock_t lock;
 157         unsigned char   protos_registered;
 158         unsigned long ll_state;
 159         void *kim_data;
 160         struct tty_struct *tty;
 161 };
 162
 163 /*
 164  * wrapper around tty->ops->write_room to check
 165  * availability during firmware download
 166  */
 167 int st_get_uart_wr_room(struct st_data_s *st_gdata);
 168 /**
 169  * st_int_write -
 170  * point this to tty->driver->write or tty->ops->write
 171  * depending upon the kernel version
 172  */
 173 int st_int_write(struct st_data_s*, const unsigned char*, int);
 174
 175 /**
 176  * st_write -
 177  * internal write function, passed onto protocol drivers
 178  * via the write function ptr of protocol struct
 179  */
 180 long st_write(struct sk_buff *);
 181
 182 /* function to be called from ST-LL */
 183 void st_ll_send_frame(enum proto_type, struct sk_buff *);
 184
 185 /* internal wake up function */
 186 void st_tx_wakeup(struct st_data_s *st_data);
 187
 188 /* init, exit entry funcs called from KIM */
 189 int st_core_init(struct st_data_s **);
 190 void st_core_exit(struct st_data_s *);
 191
 192 /* ask for reference from KIM */
 193 void st_kim_ref(struct st_data_s **, int);
 194
 195 #define GPS_STUB_TEST
 196 #ifdef GPS_STUB_TEST
 197 int gps_chrdrv_stub_write(const unsigned char*, int);
 198 void gps_chrdrv_stub_init(void);
 199 #endif
 200
 201 /*
 202  * header information used by st_kim.c
 203  */
 204
 205 /* time in msec to wait for
 206  * line discipline to be installed
 207  */
 208 #define LDISC_TIME      1000
 209 #define CMD_RESP_TIME   800
 210 #define CMD_WR_TIME     5000
 211 #define MAKEWORD(a, b)  ((unsigned short)(((unsigned char)(a)) \
 212         | ((unsigned short)((unsigned char)(b))) << 8))
 213
 214 #define GPIO_HIGH 1
 215 #define GPIO_LOW  0
 216
 217 /* the Power-On-Reset logic, requires to attempt
 218  * to download firmware onto chip more than once
 219  * since the self-test for chip takes a while
 220  */
 221 #define POR_RETRY_COUNT 5
 222
 223 /**
 224  * struct chip_version - save the chip version
 225  */
 226 struct chip_version {
 227         unsigned short full;
 228         unsigned short chip;
 229         unsigned short min_ver;
 230         unsigned short maj_ver;
 231 };
 232
 233 #define UART_DEV_NAME_LEN 32
 234 /**
 235  * struct kim_data_s - the KIM internal data, embedded as the
 236  *      platform's drv data. One for each ST device in the system.
 237  * @uim_pid: KIM needs to communicate with UIM to request to install
 238  *      the ldisc by opening UART when protocol drivers register.
 239  * @kim_pdev: the platform device added in one of the board-XX.c file
 240  *      in arch/XX/ directory, 1 for each ST device.
 241  * @kim_rcvd: completion handler to notify when data was received,
 242  *      mainly used during fw download, which involves multiple send/wait
 243  *      for each of the HCI-VS commands.
 244  * @ldisc_installed: completion handler to notify that the UIM accepted
 245  *      the request to install ldisc, notify from tty_open which suggests
 246  *      the ldisc was properly installed.
 247  * @resp_buffer: data buffer for the .bts fw file name.
 248  * @fw_entry: firmware class struct to request/release the fw.
 249  * @rx_state: the rx state for kim's receive func during fw download.
 250  * @rx_count: the rx count for the kim's receive func during fw download.
 251  * @rx_skb: all of fw data might not come at once, and hence data storage for
 252  *      whole of the fw response, only HCI_EVENTs and hence diff from ST's
 253  *      response.
 254  * @core_data: ST core's data, which mainly is the tty's disc_data
 255  * @version: chip version available via a sysfs entry.
 256  *
 257  */
 258 struct kim_data_s {
 259         long uim_pid;
 260         struct platform_device *kim_pdev;
 261         struct completion kim_rcvd, ldisc_installed;
 262         char resp_buffer[30];
 263         const struct firmware *fw_entry;
 264         long nshutdown;
 265         unsigned long rx_state;
 266         unsigned long rx_count;
 267         struct sk_buff *rx_skb;
 268         struct st_data_s *core_data;
 269         struct chip_version version;
 270         unsigned char ldisc_install;
 271         unsigned char dev_name[UART_DEV_NAME_LEN + 1];
 272         unsigned char flow_cntrl;
 273         unsigned long baud_rate;
 274 };
 275
 276 /**
 277  * functions called when 1 of the protocol drivers gets
 278  * registered, these need to communicate with UIM to request
 279  * ldisc installed, read chip_version, download relevant fw
 280  */
 281 long st_kim_start(void *);
 282 long st_kim_stop(void *);
 283
 284 void st_kim_complete(void *);
 285 void kim_st_list_protocols(struct st_data_s *, void *);
 286 void st_kim_recv(void *, const unsigned char *, long);
 287
 288
 289 /*
 290  * BTS headers
 291  */
 292 #define ACTION_SEND_COMMAND     1
 293 #define ACTION_WAIT_EVENT       2
 294 #define ACTION_SERIAL           3
 295 #define ACTION_DELAY            4
 296 #define ACTION_RUN_SCRIPT       5
 297 #define ACTION_REMARKS          6
 298
 299 /**
 300  * struct bts_header - the fw file is NOT binary which can
 301  *      be sent onto TTY as is. The .bts is more a script
 302  *      file which has different types of actions.
 303  *      Each such action needs to be parsed by the KIM and
 304  *      relevant procedure to be called.
 305  */
 306 struct bts_header {
 307         u32 magic;
 308         u32 version;
 309         u8 future[24];
 310         u8 actions[0];
 311 } __attribute__ ((packed));
 312
 313 /**
 314  * struct bts_action - Each .bts action has its own type of
 315  *      data.
 316  */
 317 struct bts_action {
 318         u16 type;
 319         u16 size;
 320         u8 data[0];
 321 } __attribute__ ((packed));
 322
 323 struct bts_action_send {
 324         u8 data[0];
 325 } __attribute__ ((packed));
 326
 327 struct bts_action_wait {
 328         u32 msec;
 329         u32 size;
 330         u8 data[0];
 331 } __attribute__ ((packed));
 332
 333 struct bts_action_delay {
 334         u32 msec;
 335 } __attribute__ ((packed));
 336
 337 struct bts_action_serial {
 338         u32 baud;
 339         u32 flow_control;
 340 } __attribute__ ((packed));
 341
 342 /**
 343  * struct hci_command - the HCI-VS for intrepreting
 344  *      the change baud rate of host-side UART, which
 345  *      needs to be ignored, since UIM would do that
 346  *      when it receives request from KIM for ldisc installation.
 347  */
 348 struct hci_command {
 349         u8 prefix;
 350         u16 opcode;
 351         u8 plen;
 352         u32 speed;
 353 } __attribute__ ((packed));
 354
 355 /*
 356  * header information used by st_ll.c
 357  */
 358
 359 /* ST LL receiver states */
 360 #define ST_W4_PACKET_TYPE       0
 361 #define ST_W4_HEADER            1
 362 #define ST_W4_DATA              2
 363
 364 /* ST LL state machines */
 365 #define ST_LL_ASLEEP               0
 366 #define ST_LL_ASLEEP_TO_AWAKE      1
 367 #define ST_LL_AWAKE                2
 368 #define ST_LL_AWAKE_TO_ASLEEP      3
 369 #define ST_LL_INVALID              4
 370
 371 /* different PM notifications coming from chip */
 372 #define LL_SLEEP_IND    0x30
 373 #define LL_SLEEP_ACK    0x31
 374 #define LL_WAKE_UP_IND  0x32
 375 #define LL_WAKE_UP_ACK  0x33
 376
 377 /* initialize and de-init ST LL */
 378 long st_ll_init(struct st_data_s *);
 379 long st_ll_deinit(struct st_data_s *);
 380
 381 /**
 382  * enable/disable ST LL along with KIM start/stop
 383  * called by ST Core
 384  */
 385 void st_ll_enable(struct st_data_s *);
 386 void st_ll_disable(struct st_data_s *);
 387
 388 /**
 389  * various funcs used by ST core to set/get the various PM states
 390  * of the chip.
 391  */
 392 unsigned long st_ll_getstate(struct st_data_s *);
 393 unsigned long st_ll_sleep_state(struct st_data_s *, unsigned char);
 394 void st_ll_wakeup(struct st_data_s *);
 395
 396 /*
 397  * header information used by st_core.c for FM and GPS
 398  * packet parsing, the bluetooth headers are already available
 399  * at net/bluetooth/
 400  */
 401
 402 struct fm_event_hdr {
 403         u8 plen;
 404 } __attribute__ ((packed));
 405
 406 #define FM_MAX_FRAME_SIZE 0xFF  /* TODO: */
 407 #define FM_EVENT_HDR_SIZE 1     /* size of fm_event_hdr */
 408 #define ST_FM_CH8_PKT 0x8
 409
 410 /* gps stuff */
 411 struct gps_event_hdr {
 412         u8 opcode;
 413         u16 plen;
 414 } __attribute__ ((packed));
 415
 416 /**
 417  * struct ti_st_plat_data - platform data shared between ST driver and
 418  *      platform specific board file which adds the ST device.
 419  * @nshutdown_gpio: Host's GPIO line to which chip's BT_EN is connected.
 420  * @dev_name: The UART/TTY name to which chip is interfaced. (eg: /dev/ttyS1)
 421  * @flow_cntrl: Should always be 1, since UART's CTS/RTS is used for PM
 422  *      purposes.
 423  * @baud_rate: The baud rate supported by the Host UART controller, this will
 424  *      be shared across with the chip via a HCI VS command from User-Space Init
 425  *      Mgr application.
 426  * @suspend:
 427  * @resume: legacy PM routines hooked to platform specific board file, so as
 428  *      to take chip-host interface specific action.
 429  * @chip_enable:
 430  * @chip_disable: Platform/Interface specific mux mode setting, GPIO
 431  *      configuring, Host side PM disabling etc.. can be done here.
 432  * @chip_asleep:
 433  * @chip_awake: Chip specific deep sleep states is communicated to Host
 434  *      specific board-xx.c to take actions such as cut UART clocks when chip
 435  *      asleep or run host faster when chip awake etc..
 436  *
 437  */
 438 struct ti_st_plat_data {
 439         long nshutdown_gpio;
 440         unsigned char dev_name[UART_DEV_NAME_LEN]; /* uart name */
 441         unsigned char flow_cntrl; /* flow control flag */
 442         unsigned long baud_rate;
 443         int (*suspend)(struct platform_device *, pm_message_t);
 444         int (*resume)(struct platform_device *);
 445         int (*chip_enable) (struct kim_data_s *);
 446         int (*chip_disable) (struct kim_data_s *);
 447         int (*chip_asleep) (struct kim_data_s *);
 448         int (*chip_awake) (struct kim_data_s *);
 449 };
 450
 451 #endif /* TI_WILINK_ST_H */