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Pavan Savoy83ef41f2010-09-17 12:06:11 -04001/*
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
Pavan Savoy83ef41f2010-09-17 12:06:11 -040028/**
Pavan Savoy83ef41f2010-09-17 12:06:11 -040029 * enum proto-type - The protocol on WiLink chips which share a
30 * common physical interface like UART.
31 */
32enum proto_type {
33 ST_BT,
34 ST_FM,
35 ST_GPS,
Pavan Savoy5c88b022011-02-04 02:23:09 -060036 ST_MAX_CHANNELS = 16,
Pavan Savoy83ef41f2010-09-17 12:06:11 -040037};
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.
Pavan Savoy5c88b022011-02-04 02:23:09 -060056 * @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.
Pavan Savoy83ef41f2010-09-17 12:06:11 -040067 */
68struct 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;
Pavan Savoy5c88b022011-02-04 02:23:09 -060075
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;
Pavan Savoy83ef41f2010-09-17 12:06:11 -040082};
83
84extern long st_register(struct st_proto_s *);
Pavan Savoy5c88b022011-02-04 02:23:09 -060085extern long st_unregister(struct st_proto_s *);
Pavan Savoy83ef41f2010-09-17 12:06:11 -040086
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.
Pavan Savoy83ef41f2010-09-17 12:06:11 -0400113 * @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.
Pavan Savoy5c88b022011-02-04 02:23:09 -0600126 * @rx_chnl: the channel ID for which the data is getting accumalated for.
Pavan Savoy83ef41f2010-09-17 12:06:11 -0400127 * @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 */
141struct st_data_s {
142 unsigned long st_state;
Pavan Savoy83ef41f2010-09-17 12:06:11 -0400143 struct sk_buff *tx_skb;
144#define ST_TX_SENDING 1
145#define ST_TX_WAKEUP 2
146 unsigned long tx_state;
Pavan Savoy5c88b022011-02-04 02:23:09 -0600147 struct st_proto_s *list[ST_MAX_CHANNELS];
Pavan Savoy764b0c42011-04-08 04:57:42 -0500148 bool is_registered[ST_MAX_CHANNELS];
Pavan Savoy83ef41f2010-09-17 12:06:11 -0400149 unsigned long rx_state;
150 unsigned long rx_count;
151 struct sk_buff *rx_skb;
Pavan Savoy5c88b022011-02-04 02:23:09 -0600152 unsigned char rx_chnl;
Pavan Savoy83ef41f2010-09-17 12:06:11 -0400153 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;
Pavan Savoy764b0c42011-04-08 04:57:42 -0500158 struct tty_struct *tty;
Pavan Savoy83ef41f2010-09-17 12:06:11 -0400159};
160
Pavan Savoyef04d122011-02-04 02:23:13 -0600161/*
162 * wrapper around tty->ops->write_room to check
163 * availability during firmware download
164 */
165int st_get_uart_wr_room(struct st_data_s *st_gdata);
Pavan Savoy83ef41f2010-09-17 12:06:11 -0400166/**
167 * st_int_write -
168 * point this to tty->driver->write or tty->ops->write
169 * depending upon the kernel version
170 */
171int 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 */
178long st_write(struct sk_buff *);
179
180/* function to be called from ST-LL */
181void st_ll_send_frame(enum proto_type, struct sk_buff *);
182
183/* internal wake up function */
184void st_tx_wakeup(struct st_data_s *st_data);
185
186/* init, exit entry funcs called from KIM */
187int st_core_init(struct st_data_s **);
188void st_core_exit(struct st_data_s *);
189
190/* ask for reference from KIM */
191void st_kim_ref(struct st_data_s **, int);
192
193#define GPS_STUB_TEST
194#ifdef GPS_STUB_TEST
195int gps_chrdrv_stub_write(const unsigned char*, int);
196void 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 */
Pavan Savoyec60d0a2011-02-04 02:23:10 -0600206#define LDISC_TIME 1000
207#define CMD_RESP_TIME 800
Pavan Savoyef04d122011-02-04 02:23:13 -0600208#define CMD_WR_TIME 5000
Pavan Savoy83ef41f2010-09-17 12:06:11 -0400209#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 */
224struct chip_version {
225 unsigned short full;
226 unsigned short chip;
227 unsigned short min_ver;
228 unsigned short maj_ver;
229};
230
Pavan Savoyec60d0a2011-02-04 02:23:10 -0600231#define UART_DEV_NAME_LEN 32
Pavan Savoy83ef41f2010-09-17 12:06:11 -0400232/**
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.
Pavan Savoy83ef41f2010-09-17 12:06:11 -0400247 * @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.
Pavan Savoy83ef41f2010-09-17 12:06:11 -0400252 * @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 */
256struct 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;
Pavan Savoy781a7392011-02-04 02:23:15 -0600262 long nshutdown;
Pavan Savoy83ef41f2010-09-17 12:06:11 -0400263 unsigned long rx_state;
264 unsigned long rx_count;
265 struct sk_buff *rx_skb;
Pavan Savoy83ef41f2010-09-17 12:06:11 -0400266 struct st_data_s *core_data;
267 struct chip_version version;
Pavan Savoyec60d0a2011-02-04 02:23:10 -0600268 unsigned char ldisc_install;
269 unsigned char dev_name[UART_DEV_NAME_LEN];
270 unsigned char flow_cntrl;
271 unsigned long baud_rate;
Pavan Savoy83ef41f2010-09-17 12:06:11 -0400272};
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 */
279long st_kim_start(void *);
280long st_kim_stop(void *);
281
282void st_kim_recv(void *, const unsigned char *, long count);
Pavan Savoy83ef41f2010-09-17 12:06:11 -0400283void st_kim_complete(void *);
284void 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 */
303struct 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 */
314struct bts_action {
315 u16 type;
316 u16 size;
317 u8 data[0];
318} __attribute__ ((packed));
319
320struct bts_action_send {
321 u8 data[0];
322} __attribute__ ((packed));
323
324struct bts_action_wait {
325 u32 msec;
326 u32 size;
327 u8 data[0];
328} __attribute__ ((packed));
329
330struct bts_action_delay {
331 u32 msec;
332} __attribute__ ((packed));
333
334struct 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 */
345struct 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
Pavan Savoy5c88b022011-02-04 02:23:09 -0600358#define ST_W4_HEADER 1
359#define ST_W4_DATA 2
Pavan Savoy83ef41f2010-09-17 12:06:11 -0400360
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 */
375long st_ll_init(struct st_data_s *);
376long 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 */
382void st_ll_enable(struct st_data_s *);
383void 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 */
389unsigned long st_ll_getstate(struct st_data_s *);
390unsigned long st_ll_sleep_state(struct st_data_s *, unsigned char);
391void 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
399struct 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 */
408struct gps_event_hdr {
409 u8 opcode;
410 u16 plen;
411} __attribute__ ((packed));
412
Pavan Savoyec60d0a2011-02-04 02:23:10 -0600413/* platform data */
414struct ti_st_plat_data {
Pavan Savoy781a7392011-02-04 02:23:15 -0600415 long nshutdown_gpio;
Pavan Savoyec60d0a2011-02-04 02:23:10 -0600416 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
Pavan Savoy83ef41f2010-09-17 12:06:11 -0400423#endif /* TI_WILINK_ST_H */