Version:  2.0.40 2.2.26 2.4.37 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0

Linux/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 extern struct ti_st_plat_data   *dt_pdata;
 90 
 91 /*
 92  * header information used by st_core.c
 93  */
 94 
 95 /* states of protocol list */
 96 #define ST_NOTEMPTY     1
 97 #define ST_EMPTY        0
 98 
 99 /*
100  * possible st_states
101  */
102 #define ST_INITIALIZING         1
103 #define ST_REG_IN_PROGRESS      2
104 #define ST_REG_PENDING          3
105 #define ST_WAITING_FOR_RESP     4
106 
107 /**
108  * struct st_data_s - ST core internal structure
109  * @st_state: different states of ST like initializing, registration
110  *      in progress, this is mainly used to return relevant err codes
111  *      when protocol drivers are registering. It is also used to track
112  *      the recv function, as in during fw download only HCI events
113  *      can occur , where as during other times other events CH8, CH9
114  *      can occur.
115  * @tty: tty provided by the TTY core for line disciplines.
116  * @tx_skb: If for some reason the tty's write returns lesser bytes written
117  *      then to maintain the rest of data to be written on next instance.
118  *      This needs to be protected, hence the lock inside wakeup func.
119  * @tx_state: if the data is being written onto the TTY and protocol driver
120  *      wants to send more, queue up data and mark that there is
121  *      more data to send.
122  * @list: the list of protocols registered, only MAX can exist, one protocol
123  *      can register only once.
124  * @rx_state: states to be maintained inside st's tty receive
125  * @rx_count: count to be maintained inside st's tty receieve
126  * @rx_skb: the skb where all data for a protocol gets accumulated,
127  *      since tty might not call receive when a complete event packet
128  *      is received, the states, count and the skb needs to be maintained.
129  * @rx_chnl: the channel ID for which the data is getting accumalated for.
130  * @txq: the list of skbs which needs to be sent onto the TTY.
131  * @tx_waitq: if the chip is not in AWAKE state, the skbs needs to be queued
132  *      up in here, PM(WAKEUP_IND) data needs to be sent and then the skbs
133  *      from waitq can be moved onto the txq.
134  *      Needs locking too.
135  * @lock: the lock to protect skbs, queues, and ST states.
136  * @protos_registered: count of the protocols registered, also when 0 the
137  *      chip enable gpio can be toggled, and when it changes to 1 the fw
138  *      needs to be downloaded to initialize chip side ST.
139  * @ll_state: the various PM states the chip can be, the states are notified
140  *      to us, when the chip sends relevant PM packets(SLEEP_IND, WAKE_IND).
141  * @kim_data: reference to the parent encapsulating structure.
142  *
143  */
144 struct st_data_s {
145         unsigned long st_state;
146         struct sk_buff *tx_skb;
147 #define ST_TX_SENDING   1
148 #define ST_TX_WAKEUP    2
149         unsigned long tx_state;
150         struct st_proto_s *list[ST_MAX_CHANNELS];
151         bool is_registered[ST_MAX_CHANNELS];
152         unsigned long rx_state;
153         unsigned long rx_count;
154         struct sk_buff *rx_skb;
155         unsigned char rx_chnl;
156         struct sk_buff_head txq, tx_waitq;
157         spinlock_t lock;
158         unsigned char   protos_registered;
159         unsigned long ll_state;
160         void *kim_data;
161         struct tty_struct *tty;
162 };
163 
164 /*
165  * wrapper around tty->ops->write_room to check
166  * availability during firmware download
167  */
168 int st_get_uart_wr_room(struct st_data_s *st_gdata);
169 /**
170  * st_int_write -
171  * point this to tty->driver->write or tty->ops->write
172  * depending upon the kernel version
173  */
174 int st_int_write(struct st_data_s*, const unsigned char*, int);
175 
176 /**
177  * st_write -
178  * internal write function, passed onto protocol drivers
179  * via the write function ptr of protocol struct
180  */
181 long st_write(struct sk_buff *);
182 
183 /* function to be called from ST-LL */
184 void st_ll_send_frame(enum proto_type, struct sk_buff *);
185 
186 /* internal wake up function */
187 void st_tx_wakeup(struct st_data_s *st_data);
188 
189 /* init, exit entry funcs called from KIM */
190 int st_core_init(struct st_data_s **);
191 void st_core_exit(struct st_data_s *);
192 
193 /* ask for reference from KIM */
194 void st_kim_ref(struct st_data_s **, int);
195 
196 #define GPS_STUB_TEST
197 #ifdef GPS_STUB_TEST
198 int gps_chrdrv_stub_write(const unsigned char*, int);
199 void gps_chrdrv_stub_init(void);
200 #endif
201 
202 /*
203  * header information used by st_kim.c
204  */
205 
206 /* time in msec to wait for
207  * line discipline to be installed
208  */
209 #define LDISC_TIME      1000
210 #define CMD_RESP_TIME   800
211 #define CMD_WR_TIME     5000
212 #define MAKEWORD(a, b)  ((unsigned short)(((unsigned char)(a)) \
213         | ((unsigned short)((unsigned char)(b))) << 8))
214 
215 #define GPIO_HIGH 1
216 #define GPIO_LOW  0
217 
218 /* the Power-On-Reset logic, requires to attempt
219  * to download firmware onto chip more than once
220  * since the self-test for chip takes a while
221  */
222 #define POR_RETRY_COUNT 5
223 
224 /**
225  * struct chip_version - save the chip version
226  */
227 struct chip_version {
228         unsigned short full;
229         unsigned short chip;
230         unsigned short min_ver;
231         unsigned short maj_ver;
232 };
233 
234 #define UART_DEV_NAME_LEN 32
235 /**
236  * struct kim_data_s - the KIM internal data, embedded as the
237  *      platform's drv data. One for each ST device in the system.
238  * @uim_pid: KIM needs to communicate with UIM to request to install
239  *      the ldisc by opening UART when protocol drivers register.
240  * @kim_pdev: the platform device added in one of the board-XX.c file
241  *      in arch/XX/ directory, 1 for each ST device.
242  * @kim_rcvd: completion handler to notify when data was received,
243  *      mainly used during fw download, which involves multiple send/wait
244  *      for each of the HCI-VS commands.
245  * @ldisc_installed: completion handler to notify that the UIM accepted
246  *      the request to install ldisc, notify from tty_open which suggests
247  *      the ldisc was properly installed.
248  * @resp_buffer: data buffer for the .bts fw file name.
249  * @fw_entry: firmware class struct to request/release the fw.
250  * @rx_state: the rx state for kim's receive func during fw download.
251  * @rx_count: the rx count for the kim's receive func during fw download.
252  * @rx_skb: all of fw data might not come at once, and hence data storage for
253  *      whole of the fw response, only HCI_EVENTs and hence diff from ST's
254  *      response.
255  * @core_data: ST core's data, which mainly is the tty's disc_data
256  * @version: chip version available via a sysfs entry.
257  *
258  */
259 struct kim_data_s {
260         long uim_pid;
261         struct platform_device *kim_pdev;
262         struct completion kim_rcvd, ldisc_installed;
263         char resp_buffer[30];
264         const struct firmware *fw_entry;
265         unsigned nshutdown;
266         unsigned long rx_state;
267         unsigned long rx_count;
268         struct sk_buff *rx_skb;
269         struct st_data_s *core_data;
270         struct chip_version version;
271         unsigned char ldisc_install;
272         unsigned char dev_name[UART_DEV_NAME_LEN + 1];
273         unsigned flow_cntrl;
274         unsigned baud_rate;
275 };
276 
277 /**
278  * functions called when 1 of the protocol drivers gets
279  * registered, these need to communicate with UIM to request
280  * ldisc installed, read chip_version, download relevant fw
281  */
282 long st_kim_start(void *);
283 long st_kim_stop(void *);
284 
285 void st_kim_complete(void *);
286 void kim_st_list_protocols(struct st_data_s *, void *);
287 void st_kim_recv(void *, const unsigned char *, long);
288 
289 
290 /*
291  * BTS headers
292  */
293 #define ACTION_SEND_COMMAND     1
294 #define ACTION_WAIT_EVENT       2
295 #define ACTION_SERIAL           3
296 #define ACTION_DELAY            4
297 #define ACTION_RUN_SCRIPT       5
298 #define ACTION_REMARKS          6
299 
300 /**
301  * struct bts_header - the fw file is NOT binary which can
302  *      be sent onto TTY as is. The .bts is more a script
303  *      file which has different types of actions.
304  *      Each such action needs to be parsed by the KIM and
305  *      relevant procedure to be called.
306  */
307 struct bts_header {
308         u32 magic;
309         u32 version;
310         u8 future[24];
311         u8 actions[0];
312 } __attribute__ ((packed));
313 
314 /**
315  * struct bts_action - Each .bts action has its own type of
316  *      data.
317  */
318 struct bts_action {
319         u16 type;
320         u16 size;
321         u8 data[0];
322 } __attribute__ ((packed));
323 
324 struct bts_action_send {
325         u8 data[0];
326 } __attribute__ ((packed));
327 
328 struct bts_action_wait {
329         u32 msec;
330         u32 size;
331         u8 data[0];
332 } __attribute__ ((packed));
333 
334 struct bts_action_delay {
335         u32 msec;
336 } __attribute__ ((packed));
337 
338 struct bts_action_serial {
339         u32 baud;
340         u32 flow_control;
341 } __attribute__ ((packed));
342 
343 /**
344  * struct hci_command - the HCI-VS for intrepreting
345  *      the change baud rate of host-side UART, which
346  *      needs to be ignored, since UIM would do that
347  *      when it receives request from KIM for ldisc installation.
348  */
349 struct hci_command {
350         u8 prefix;
351         u16 opcode;
352         u8 plen;
353         u32 speed;
354 } __attribute__ ((packed));
355 
356 /*
357  * header information used by st_ll.c
358  */
359 
360 /* ST LL receiver states */
361 #define ST_W4_PACKET_TYPE       0
362 #define ST_W4_HEADER            1
363 #define ST_W4_DATA              2
364 
365 /* ST LL state machines */
366 #define ST_LL_ASLEEP               0
367 #define ST_LL_ASLEEP_TO_AWAKE      1
368 #define ST_LL_AWAKE                2
369 #define ST_LL_AWAKE_TO_ASLEEP      3
370 #define ST_LL_INVALID              4
371 
372 /* different PM notifications coming from chip */
373 #define LL_SLEEP_IND    0x30
374 #define LL_SLEEP_ACK    0x31
375 #define LL_WAKE_UP_IND  0x32
376 #define LL_WAKE_UP_ACK  0x33
377 
378 /* initialize and de-init ST LL */
379 long st_ll_init(struct st_data_s *);
380 long st_ll_deinit(struct st_data_s *);
381 
382 /**
383  * enable/disable ST LL along with KIM start/stop
384  * called by ST Core
385  */
386 void st_ll_enable(struct st_data_s *);
387 void st_ll_disable(struct st_data_s *);
388 
389 /**
390  * various funcs used by ST core to set/get the various PM states
391  * of the chip.
392  */
393 unsigned long st_ll_getstate(struct st_data_s *);
394 unsigned long st_ll_sleep_state(struct st_data_s *, unsigned char);
395 void st_ll_wakeup(struct st_data_s *);
396 
397 /*
398  * header information used by st_core.c for FM and GPS
399  * packet parsing, the bluetooth headers are already available
400  * at net/bluetooth/
401  */
402 
403 struct fm_event_hdr {
404         u8 plen;
405 } __attribute__ ((packed));
406 
407 #define FM_MAX_FRAME_SIZE 0xFF  /* TODO: */
408 #define FM_EVENT_HDR_SIZE 1     /* size of fm_event_hdr */
409 #define ST_FM_CH8_PKT 0x8
410 
411 /* gps stuff */
412 struct gps_event_hdr {
413         u8 opcode;
414         u16 plen;
415 } __attribute__ ((packed));
416 
417 /**
418  * struct ti_st_plat_data - platform data shared between ST driver and
419  *      platform specific board file which adds the ST device.
420  * @nshutdown_gpio: Host's GPIO line to which chip's BT_EN is connected.
421  * @dev_name: The UART/TTY name to which chip is interfaced. (eg: /dev/ttyS1)
422  * @flow_cntrl: Should always be 1, since UART's CTS/RTS is used for PM
423  *      purposes.
424  * @baud_rate: The baud rate supported by the Host UART controller, this will
425  *      be shared across with the chip via a HCI VS command from User-Space Init
426  *      Mgr application.
427  * @suspend:
428  * @resume: legacy PM routines hooked to platform specific board file, so as
429  *      to take chip-host interface specific action.
430  * @chip_enable:
431  * @chip_disable: Platform/Interface specific mux mode setting, GPIO
432  *      configuring, Host side PM disabling etc.. can be done here.
433  * @chip_asleep:
434  * @chip_awake: Chip specific deep sleep states is communicated to Host
435  *      specific board-xx.c to take actions such as cut UART clocks when chip
436  *      asleep or run host faster when chip awake etc..
437  *
438  */
439 struct ti_st_plat_data {
440         u32 nshutdown_gpio;
441         unsigned char dev_name[UART_DEV_NAME_LEN]; /* uart name */
442         u32 flow_cntrl; /* flow control flag */
443         u32 baud_rate;
444         int (*suspend)(struct platform_device *, pm_message_t);
445         int (*resume)(struct platform_device *);
446         int (*chip_enable) (struct kim_data_s *);
447         int (*chip_disable) (struct kim_data_s *);
448         int (*chip_asleep) (struct kim_data_s *);
449         int (*chip_awake) (struct kim_data_s *);
450 };
451 
452 #endif /* TI_WILINK_ST_H */
453 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us