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af3b8881 RG |
1 | /**************************************************************************** |
2 | * | |
3 | * Driver for the IFX 6x60 spi modem. | |
4 | * | |
5 | * Copyright (C) 2008 Option International | |
6 | * Copyright (C) 2008 Filip Aben <f.aben@option.com> | |
7 | * Denis Joseph Barrow <d.barow@option.com> | |
8 | * Jan Dumon <j.dumon@option.com> | |
9 | * | |
10 | * Copyright (C) 2009, 2010 Intel Corp | |
2f1522ec | 11 | * Russ Gorby <russ.gorby@intel.com> |
af3b8881 RG |
12 | * |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License version 2 as | |
15 | * published by the Free Software Foundation. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License | |
23 | * along with this program; if not, write to the Free Software | |
24 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, | |
25 | * USA | |
26 | * | |
27 | * Driver modified by Intel from Option gtm501l_spi.c | |
28 | * | |
29 | * Notes | |
30 | * o The driver currently assumes a single device only. If you need to | |
31 | * change this then look for saved_ifx_dev and add a device lookup | |
32 | * o The driver is intended to be big-endian safe but has never been | |
33 | * tested that way (no suitable hardware). There are a couple of FIXME | |
34 | * notes by areas that may need addressing | |
35 | * o Some of the GPIO naming/setup assumptions may need revisiting if | |
36 | * you need to use this driver for another platform. | |
37 | * | |
38 | *****************************************************************************/ | |
b7f080cf | 39 | #include <linux/dma-mapping.h> |
af3b8881 RG |
40 | #include <linux/module.h> |
41 | #include <linux/termios.h> | |
42 | #include <linux/tty.h> | |
43 | #include <linux/device.h> | |
44 | #include <linux/spi/spi.h> | |
af3b8881 RG |
45 | #include <linux/kfifo.h> |
46 | #include <linux/tty_flip.h> | |
47 | #include <linux/timer.h> | |
48 | #include <linux/serial.h> | |
49 | #include <linux/interrupt.h> | |
50 | #include <linux/irq.h> | |
51 | #include <linux/rfkill.h> | |
52 | #include <linux/fs.h> | |
53 | #include <linux/ip.h> | |
54 | #include <linux/dmapool.h> | |
55 | #include <linux/gpio.h> | |
56 | #include <linux/sched.h> | |
57 | #include <linux/time.h> | |
58 | #include <linux/wait.h> | |
af3b8881 RG |
59 | #include <linux/pm.h> |
60 | #include <linux/pm_runtime.h> | |
61 | #include <linux/spi/ifx_modem.h> | |
83abd0d8 | 62 | #include <linux/delay.h> |
72d4724e | 63 | #include <linux/reboot.h> |
af3b8881 RG |
64 | |
65 | #include "ifx6x60.h" | |
66 | ||
67 | #define IFX_SPI_MORE_MASK 0x10 | |
1b2f8a95 | 68 | #define IFX_SPI_MORE_BIT 4 /* bit position in u8 */ |
69 | #define IFX_SPI_CTS_BIT 6 /* bit position in u8 */ | |
2aff8d90 | 70 | #define IFX_SPI_MODE SPI_MODE_1 |
af3b8881 RG |
71 | #define IFX_SPI_TTY_ID 0 |
72 | #define IFX_SPI_TIMEOUT_SEC 2 | |
73 | #define IFX_SPI_HEADER_0 (-1) | |
74 | #define IFX_SPI_HEADER_F (-2) | |
75 | ||
72d4724e JC |
76 | #define PO_POST_DELAY 200 |
77 | #define IFX_MDM_RST_PMU 4 | |
78 | ||
af3b8881 RG |
79 | /* forward reference */ |
80 | static void ifx_spi_handle_srdy(struct ifx_spi_device *ifx_dev); | |
72d4724e JC |
81 | static int ifx_modem_reboot_callback(struct notifier_block *nfb, |
82 | unsigned long event, void *data); | |
83 | static int ifx_modem_power_off(struct ifx_spi_device *ifx_dev); | |
af3b8881 RG |
84 | |
85 | /* local variables */ | |
f089140e | 86 | static int spi_bpw = 16; /* 8, 16 or 32 bit word length */ |
af3b8881 RG |
87 | static struct tty_driver *tty_drv; |
88 | static struct ifx_spi_device *saved_ifx_dev; | |
89 | static struct lock_class_key ifx_spi_key; | |
90 | ||
72d4724e JC |
91 | static struct notifier_block ifx_modem_reboot_notifier_block = { |
92 | .notifier_call = ifx_modem_reboot_callback, | |
93 | }; | |
94 | ||
95 | static int ifx_modem_power_off(struct ifx_spi_device *ifx_dev) | |
96 | { | |
97 | gpio_set_value(IFX_MDM_RST_PMU, 1); | |
98 | msleep(PO_POST_DELAY); | |
99 | ||
100 | return 0; | |
101 | } | |
102 | ||
103 | static int ifx_modem_reboot_callback(struct notifier_block *nfb, | |
104 | unsigned long event, void *data) | |
105 | { | |
106 | if (saved_ifx_dev) | |
107 | ifx_modem_power_off(saved_ifx_dev); | |
108 | else | |
109 | pr_warn("no ifx modem active;\n"); | |
110 | ||
111 | return NOTIFY_OK; | |
112 | } | |
113 | ||
af3b8881 RG |
114 | /* GPIO/GPE settings */ |
115 | ||
116 | /** | |
117 | * mrdy_set_high - set MRDY GPIO | |
118 | * @ifx: device we are controlling | |
119 | * | |
120 | */ | |
121 | static inline void mrdy_set_high(struct ifx_spi_device *ifx) | |
122 | { | |
123 | gpio_set_value(ifx->gpio.mrdy, 1); | |
124 | } | |
125 | ||
126 | /** | |
127 | * mrdy_set_low - clear MRDY GPIO | |
128 | * @ifx: device we are controlling | |
129 | * | |
130 | */ | |
131 | static inline void mrdy_set_low(struct ifx_spi_device *ifx) | |
132 | { | |
133 | gpio_set_value(ifx->gpio.mrdy, 0); | |
134 | } | |
135 | ||
136 | /** | |
137 | * ifx_spi_power_state_set | |
138 | * @ifx_dev: our SPI device | |
139 | * @val: bits to set | |
140 | * | |
141 | * Set bit in power status and signal power system if status becomes non-0 | |
142 | */ | |
143 | static void | |
144 | ifx_spi_power_state_set(struct ifx_spi_device *ifx_dev, unsigned char val) | |
145 | { | |
146 | unsigned long flags; | |
147 | ||
148 | spin_lock_irqsave(&ifx_dev->power_lock, flags); | |
149 | ||
150 | /* | |
151 | * if power status is already non-0, just update, else | |
152 | * tell power system | |
153 | */ | |
154 | if (!ifx_dev->power_status) | |
155 | pm_runtime_get(&ifx_dev->spi_dev->dev); | |
156 | ifx_dev->power_status |= val; | |
157 | ||
158 | spin_unlock_irqrestore(&ifx_dev->power_lock, flags); | |
159 | } | |
160 | ||
161 | /** | |
162 | * ifx_spi_power_state_clear - clear power bit | |
163 | * @ifx_dev: our SPI device | |
164 | * @val: bits to clear | |
165 | * | |
166 | * clear bit in power status and signal power system if status becomes 0 | |
167 | */ | |
168 | static void | |
169 | ifx_spi_power_state_clear(struct ifx_spi_device *ifx_dev, unsigned char val) | |
170 | { | |
171 | unsigned long flags; | |
172 | ||
173 | spin_lock_irqsave(&ifx_dev->power_lock, flags); | |
174 | ||
175 | if (ifx_dev->power_status) { | |
176 | ifx_dev->power_status &= ~val; | |
177 | if (!ifx_dev->power_status) | |
178 | pm_runtime_put(&ifx_dev->spi_dev->dev); | |
179 | } | |
180 | ||
181 | spin_unlock_irqrestore(&ifx_dev->power_lock, flags); | |
182 | } | |
183 | ||
184 | /** | |
319fb0d2 | 185 | * swap_buf_8 |
af3b8881 RG |
186 | * @buf: our buffer |
187 | * @len : number of bytes (not words) in the buffer | |
188 | * @end: end of buffer | |
189 | * | |
190 | * Swap the contents of a buffer into big endian format | |
191 | */ | |
319fb0d2 | 192 | static inline void swap_buf_8(unsigned char *buf, int len, void *end) |
193 | { | |
194 | /* don't swap buffer if SPI word width is 8 bits */ | |
195 | return; | |
196 | } | |
197 | ||
198 | /** | |
199 | * swap_buf_16 | |
200 | * @buf: our buffer | |
201 | * @len : number of bytes (not words) in the buffer | |
202 | * @end: end of buffer | |
203 | * | |
204 | * Swap the contents of a buffer into big endian format | |
205 | */ | |
206 | static inline void swap_buf_16(unsigned char *buf, int len, void *end) | |
af3b8881 RG |
207 | { |
208 | int n; | |
209 | ||
319fb0d2 | 210 | u16 *buf_16 = (u16 *)buf; |
af3b8881 | 211 | len = ((len + 1) >> 1); |
319fb0d2 | 212 | if ((void *)&buf_16[len] > end) { |
213 | pr_err("swap_buf_16: swap exceeds boundary (%p > %p)!", | |
214 | &buf_16[len], end); | |
af3b8881 RG |
215 | return; |
216 | } | |
217 | for (n = 0; n < len; n++) { | |
319fb0d2 | 218 | *buf_16 = cpu_to_be16(*buf_16); |
219 | buf_16++; | |
220 | } | |
221 | } | |
222 | ||
223 | /** | |
224 | * swap_buf_32 | |
225 | * @buf: our buffer | |
226 | * @len : number of bytes (not words) in the buffer | |
227 | * @end: end of buffer | |
228 | * | |
229 | * Swap the contents of a buffer into big endian format | |
230 | */ | |
231 | static inline void swap_buf_32(unsigned char *buf, int len, void *end) | |
232 | { | |
233 | int n; | |
234 | ||
235 | u32 *buf_32 = (u32 *)buf; | |
236 | len = (len + 3) >> 2; | |
237 | ||
238 | if ((void *)&buf_32[len] > end) { | |
239 | pr_err("swap_buf_32: swap exceeds boundary (%p > %p)!\n", | |
240 | &buf_32[len], end); | |
241 | return; | |
242 | } | |
243 | for (n = 0; n < len; n++) { | |
244 | *buf_32 = cpu_to_be32(*buf_32); | |
245 | buf_32++; | |
af3b8881 RG |
246 | } |
247 | } | |
248 | ||
249 | /** | |
250 | * mrdy_assert - assert MRDY line | |
251 | * @ifx_dev: our SPI device | |
252 | * | |
253 | * Assert mrdy and set timer to wait for SRDY interrupt, if SRDY is low | |
254 | * now. | |
255 | * | |
256 | * FIXME: Can SRDY even go high as we are running this code ? | |
257 | */ | |
258 | static void mrdy_assert(struct ifx_spi_device *ifx_dev) | |
259 | { | |
260 | int val = gpio_get_value(ifx_dev->gpio.srdy); | |
261 | if (!val) { | |
262 | if (!test_and_set_bit(IFX_SPI_STATE_TIMER_PENDING, | |
263 | &ifx_dev->flags)) { | |
c73ba2ae | 264 | mod_timer(&ifx_dev->spi_timer,jiffies + IFX_SPI_TIMEOUT_SEC*HZ); |
af3b8881 RG |
265 | |
266 | } | |
267 | } | |
268 | ifx_spi_power_state_set(ifx_dev, IFX_SPI_POWER_DATA_PENDING); | |
269 | mrdy_set_high(ifx_dev); | |
270 | } | |
271 | ||
af3b8881 RG |
272 | /** |
273 | * ifx_spi_timeout - SPI timeout | |
274 | * @arg: our SPI device | |
275 | * | |
276 | * The SPI has timed out: hang up the tty. Users will then see a hangup | |
277 | * and error events. | |
278 | */ | |
279 | static void ifx_spi_timeout(unsigned long arg) | |
280 | { | |
281 | struct ifx_spi_device *ifx_dev = (struct ifx_spi_device *)arg; | |
282 | ||
283 | dev_warn(&ifx_dev->spi_dev->dev, "*** SPI Timeout ***"); | |
aa27a094 | 284 | tty_port_tty_hangup(&ifx_dev->tty_port, false); |
af3b8881 RG |
285 | mrdy_set_low(ifx_dev); |
286 | clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags); | |
287 | } | |
288 | ||
289 | /* char/tty operations */ | |
290 | ||
291 | /** | |
292 | * ifx_spi_tiocmget - get modem lines | |
293 | * @tty: our tty device | |
294 | * @filp: file handle issuing the request | |
295 | * | |
296 | * Map the signal state into Linux modem flags and report the value | |
297 | * in Linux terms | |
298 | */ | |
60b33c13 | 299 | static int ifx_spi_tiocmget(struct tty_struct *tty) |
af3b8881 RG |
300 | { |
301 | unsigned int value; | |
302 | struct ifx_spi_device *ifx_dev = tty->driver_data; | |
303 | ||
304 | value = | |
305 | (test_bit(IFX_SPI_RTS, &ifx_dev->signal_state) ? TIOCM_RTS : 0) | | |
306 | (test_bit(IFX_SPI_DTR, &ifx_dev->signal_state) ? TIOCM_DTR : 0) | | |
307 | (test_bit(IFX_SPI_CTS, &ifx_dev->signal_state) ? TIOCM_CTS : 0) | | |
308 | (test_bit(IFX_SPI_DSR, &ifx_dev->signal_state) ? TIOCM_DSR : 0) | | |
309 | (test_bit(IFX_SPI_DCD, &ifx_dev->signal_state) ? TIOCM_CAR : 0) | | |
310 | (test_bit(IFX_SPI_RI, &ifx_dev->signal_state) ? TIOCM_RNG : 0); | |
311 | return value; | |
312 | } | |
313 | ||
314 | /** | |
315 | * ifx_spi_tiocmset - set modem bits | |
316 | * @tty: the tty structure | |
af3b8881 RG |
317 | * @set: bits to set |
318 | * @clear: bits to clear | |
319 | * | |
320 | * The IFX6x60 only supports DTR and RTS. Set them accordingly | |
321 | * and flag that an update to the modem is needed. | |
322 | * | |
323 | * FIXME: do we need to kick the tranfers when we do this ? | |
324 | */ | |
20b9d177 | 325 | static int ifx_spi_tiocmset(struct tty_struct *tty, |
af3b8881 RG |
326 | unsigned int set, unsigned int clear) |
327 | { | |
328 | struct ifx_spi_device *ifx_dev = tty->driver_data; | |
329 | ||
330 | if (set & TIOCM_RTS) | |
331 | set_bit(IFX_SPI_RTS, &ifx_dev->signal_state); | |
332 | if (set & TIOCM_DTR) | |
333 | set_bit(IFX_SPI_DTR, &ifx_dev->signal_state); | |
334 | if (clear & TIOCM_RTS) | |
335 | clear_bit(IFX_SPI_RTS, &ifx_dev->signal_state); | |
336 | if (clear & TIOCM_DTR) | |
337 | clear_bit(IFX_SPI_DTR, &ifx_dev->signal_state); | |
338 | ||
339 | set_bit(IFX_SPI_UPDATE, &ifx_dev->signal_state); | |
340 | return 0; | |
341 | } | |
342 | ||
343 | /** | |
344 | * ifx_spi_open - called on tty open | |
345 | * @tty: our tty device | |
346 | * @filp: file handle being associated with the tty | |
347 | * | |
348 | * Open the tty interface. We let the tty_port layer do all the work | |
349 | * for us. | |
350 | * | |
351 | * FIXME: Remove single device assumption and saved_ifx_dev | |
352 | */ | |
353 | static int ifx_spi_open(struct tty_struct *tty, struct file *filp) | |
354 | { | |
355 | return tty_port_open(&saved_ifx_dev->tty_port, tty, filp); | |
356 | } | |
357 | ||
358 | /** | |
359 | * ifx_spi_close - called when our tty closes | |
360 | * @tty: the tty being closed | |
361 | * @filp: the file handle being closed | |
362 | * | |
363 | * Perform the close of the tty. We use the tty_port layer to do all | |
364 | * our hard work. | |
365 | */ | |
366 | static void ifx_spi_close(struct tty_struct *tty, struct file *filp) | |
367 | { | |
368 | struct ifx_spi_device *ifx_dev = tty->driver_data; | |
369 | tty_port_close(&ifx_dev->tty_port, tty, filp); | |
370 | /* FIXME: should we do an ifx_spi_reset here ? */ | |
371 | } | |
372 | ||
373 | /** | |
374 | * ifx_decode_spi_header - decode received header | |
375 | * @buffer: the received data | |
376 | * @length: decoded length | |
377 | * @more: decoded more flag | |
378 | * @received_cts: status of cts we received | |
379 | * | |
380 | * Note how received_cts is handled -- if header is all F it is left | |
381 | * the same as it was, if header is all 0 it is set to 0 otherwise it is | |
382 | * taken from the incoming header. | |
383 | * | |
384 | * FIXME: endianness | |
385 | */ | |
386 | static int ifx_spi_decode_spi_header(unsigned char *buffer, int *length, | |
387 | unsigned char *more, unsigned char *received_cts) | |
388 | { | |
389 | u16 h1; | |
390 | u16 h2; | |
391 | u16 *in_buffer = (u16 *)buffer; | |
392 | ||
393 | h1 = *in_buffer; | |
394 | h2 = *(in_buffer+1); | |
395 | ||
396 | if (h1 == 0 && h2 == 0) { | |
397 | *received_cts = 0; | |
0b8053fe | 398 | *more = 0; |
af3b8881 RG |
399 | return IFX_SPI_HEADER_0; |
400 | } else if (h1 == 0xffff && h2 == 0xffff) { | |
0b8053fe | 401 | *more = 0; |
af3b8881 RG |
402 | /* spi_slave_cts remains as it was */ |
403 | return IFX_SPI_HEADER_F; | |
404 | } | |
405 | ||
406 | *length = h1 & 0xfff; /* upper bits of byte are flags */ | |
407 | *more = (buffer[1] >> IFX_SPI_MORE_BIT) & 1; | |
408 | *received_cts = (buffer[3] >> IFX_SPI_CTS_BIT) & 1; | |
409 | return 0; | |
410 | } | |
411 | ||
412 | /** | |
413 | * ifx_setup_spi_header - set header fields | |
414 | * @txbuffer: pointer to start of SPI buffer | |
415 | * @tx_count: bytes | |
416 | * @more: indicate if more to follow | |
417 | * | |
418 | * Format up an SPI header for a transfer | |
419 | * | |
420 | * FIXME: endianness? | |
421 | */ | |
422 | static void ifx_spi_setup_spi_header(unsigned char *txbuffer, int tx_count, | |
423 | unsigned char more) | |
424 | { | |
425 | *(u16 *)(txbuffer) = tx_count; | |
426 | *(u16 *)(txbuffer+2) = IFX_SPI_PAYLOAD_SIZE; | |
427 | txbuffer[1] |= (more << IFX_SPI_MORE_BIT) & IFX_SPI_MORE_MASK; | |
428 | } | |
429 | ||
af3b8881 RG |
430 | /** |
431 | * ifx_spi_prepare_tx_buffer - prepare transmit frame | |
432 | * @ifx_dev: our SPI device | |
433 | * | |
434 | * The transmit buffr needs a header and various other bits of | |
435 | * information followed by as much data as we can pull from the FIFO | |
436 | * and transfer. This function formats up a suitable buffer in the | |
437 | * ifx_dev->tx_buffer | |
438 | * | |
439 | * FIXME: performance - should we wake the tty when the queue is half | |
440 | * empty ? | |
441 | */ | |
442 | static int ifx_spi_prepare_tx_buffer(struct ifx_spi_device *ifx_dev) | |
443 | { | |
444 | int temp_count; | |
445 | int queue_length; | |
446 | int tx_count; | |
447 | unsigned char *tx_buffer; | |
448 | ||
449 | tx_buffer = ifx_dev->tx_buffer; | |
af3b8881 RG |
450 | |
451 | /* make room for required SPI header */ | |
452 | tx_buffer += IFX_SPI_HEADER_OVERHEAD; | |
453 | tx_count = IFX_SPI_HEADER_OVERHEAD; | |
454 | ||
455 | /* clear to signal no more data if this turns out to be the | |
456 | * last buffer sent in a sequence */ | |
457 | ifx_dev->spi_more = 0; | |
458 | ||
459 | /* if modem cts is set, just send empty buffer */ | |
460 | if (!ifx_dev->spi_slave_cts) { | |
461 | /* see if there's tx data */ | |
462 | queue_length = kfifo_len(&ifx_dev->tx_fifo); | |
463 | if (queue_length != 0) { | |
464 | /* data to mux -- see if there's room for it */ | |
465 | temp_count = min(queue_length, IFX_SPI_PAYLOAD_SIZE); | |
466 | temp_count = kfifo_out_locked(&ifx_dev->tx_fifo, | |
467 | tx_buffer, temp_count, | |
468 | &ifx_dev->fifo_lock); | |
469 | ||
470 | /* update buffer pointer and data count in message */ | |
471 | tx_buffer += temp_count; | |
472 | tx_count += temp_count; | |
473 | if (temp_count == queue_length) | |
474 | /* poke port to get more data */ | |
6aad04f2 | 475 | tty_port_tty_wakeup(&ifx_dev->tty_port); |
af3b8881 RG |
476 | else /* more data in port, use next SPI message */ |
477 | ifx_dev->spi_more = 1; | |
478 | } | |
479 | } | |
480 | /* have data and info for header -- set up SPI header in buffer */ | |
481 | /* spi header needs payload size, not entire buffer size */ | |
482 | ifx_spi_setup_spi_header(ifx_dev->tx_buffer, | |
483 | tx_count-IFX_SPI_HEADER_OVERHEAD, | |
484 | ifx_dev->spi_more); | |
485 | /* swap actual data in the buffer */ | |
319fb0d2 | 486 | ifx_dev->swap_buf((ifx_dev->tx_buffer), tx_count, |
af3b8881 RG |
487 | &ifx_dev->tx_buffer[IFX_SPI_TRANSFER_SIZE]); |
488 | return tx_count; | |
489 | } | |
490 | ||
491 | /** | |
492 | * ifx_spi_write - line discipline write | |
493 | * @tty: our tty device | |
494 | * @buf: pointer to buffer to write (kernel space) | |
495 | * @count: size of buffer | |
496 | * | |
497 | * Write the characters we have been given into the FIFO. If the device | |
498 | * is not active then activate it, when the SRDY line is asserted back | |
499 | * this will commence I/O | |
500 | */ | |
501 | static int ifx_spi_write(struct tty_struct *tty, const unsigned char *buf, | |
502 | int count) | |
503 | { | |
504 | struct ifx_spi_device *ifx_dev = tty->driver_data; | |
505 | unsigned char *tmp_buf = (unsigned char *)buf; | |
e8823f1c JC |
506 | unsigned long flags; |
507 | bool is_fifo_empty; | |
bc6835a4 | 508 | int tx_count; |
e8823f1c JC |
509 | |
510 | spin_lock_irqsave(&ifx_dev->fifo_lock, flags); | |
511 | is_fifo_empty = kfifo_is_empty(&ifx_dev->tx_fifo); | |
bc6835a4 | 512 | tx_count = kfifo_in(&ifx_dev->tx_fifo, tmp_buf, count); |
e8823f1c JC |
513 | spin_unlock_irqrestore(&ifx_dev->fifo_lock, flags); |
514 | if (is_fifo_empty) | |
515 | mrdy_assert(ifx_dev); | |
516 | ||
af3b8881 RG |
517 | return tx_count; |
518 | } | |
519 | ||
520 | /** | |
521 | * ifx_spi_chars_in_buffer - line discipline helper | |
522 | * @tty: our tty device | |
523 | * | |
524 | * Report how much data we can accept before we drop bytes. As we use | |
525 | * a simple FIFO this is nice and easy. | |
526 | */ | |
527 | static int ifx_spi_write_room(struct tty_struct *tty) | |
528 | { | |
529 | struct ifx_spi_device *ifx_dev = tty->driver_data; | |
530 | return IFX_SPI_FIFO_SIZE - kfifo_len(&ifx_dev->tx_fifo); | |
531 | } | |
532 | ||
533 | /** | |
534 | * ifx_spi_chars_in_buffer - line discipline helper | |
535 | * @tty: our tty device | |
536 | * | |
537 | * Report how many characters we have buffered. In our case this is the | |
538 | * number of bytes sitting in our transmit FIFO. | |
539 | */ | |
540 | static int ifx_spi_chars_in_buffer(struct tty_struct *tty) | |
541 | { | |
542 | struct ifx_spi_device *ifx_dev = tty->driver_data; | |
543 | return kfifo_len(&ifx_dev->tx_fifo); | |
544 | } | |
545 | ||
546 | /** | |
547 | * ifx_port_hangup | |
548 | * @port: our tty port | |
549 | * | |
550 | * tty port hang up. Called when tty_hangup processing is invoked either | |
551 | * by loss of carrier, or by software (eg vhangup). Serialized against | |
552 | * activate/shutdown by the tty layer. | |
553 | */ | |
554 | static void ifx_spi_hangup(struct tty_struct *tty) | |
555 | { | |
556 | struct ifx_spi_device *ifx_dev = tty->driver_data; | |
557 | tty_port_hangup(&ifx_dev->tty_port); | |
558 | } | |
559 | ||
560 | /** | |
561 | * ifx_port_activate | |
562 | * @port: our tty port | |
563 | * | |
564 | * tty port activate method - called for first open. Serialized | |
565 | * with hangup and shutdown by the tty layer. | |
566 | */ | |
567 | static int ifx_port_activate(struct tty_port *port, struct tty_struct *tty) | |
568 | { | |
569 | struct ifx_spi_device *ifx_dev = | |
570 | container_of(port, struct ifx_spi_device, tty_port); | |
571 | ||
572 | /* clear any old data; can't do this in 'close' */ | |
573 | kfifo_reset(&ifx_dev->tx_fifo); | |
574 | ||
31fe9904 | 575 | /* clear any flag which may be set in port shutdown procedure */ |
576 | clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags); | |
577 | clear_bit(IFX_SPI_STATE_IO_READY, &ifx_dev->flags); | |
578 | ||
af3b8881 RG |
579 | /* put port data into this tty */ |
580 | tty->driver_data = ifx_dev; | |
581 | ||
582 | /* allows flip string push from int context */ | |
d6c53c0e | 583 | port->low_latency = 1; |
af3b8881 | 584 | |
31fe9904 | 585 | /* set flag to allows data transfer */ |
586 | set_bit(IFX_SPI_STATE_IO_AVAILABLE, &ifx_dev->flags); | |
587 | ||
af3b8881 RG |
588 | return 0; |
589 | } | |
590 | ||
591 | /** | |
592 | * ifx_port_shutdown | |
593 | * @port: our tty port | |
594 | * | |
595 | * tty port shutdown method - called for last port close. Serialized | |
596 | * with hangup and activate by the tty layer. | |
597 | */ | |
598 | static void ifx_port_shutdown(struct tty_port *port) | |
599 | { | |
600 | struct ifx_spi_device *ifx_dev = | |
601 | container_of(port, struct ifx_spi_device, tty_port); | |
602 | ||
31fe9904 | 603 | clear_bit(IFX_SPI_STATE_IO_AVAILABLE, &ifx_dev->flags); |
af3b8881 | 604 | mrdy_set_low(ifx_dev); |
014b9b4c | 605 | del_timer(&ifx_dev->spi_timer); |
af3b8881 RG |
606 | clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags); |
607 | tasklet_kill(&ifx_dev->io_work_tasklet); | |
608 | } | |
609 | ||
610 | static const struct tty_port_operations ifx_tty_port_ops = { | |
611 | .activate = ifx_port_activate, | |
612 | .shutdown = ifx_port_shutdown, | |
613 | }; | |
614 | ||
615 | static const struct tty_operations ifx_spi_serial_ops = { | |
616 | .open = ifx_spi_open, | |
617 | .close = ifx_spi_close, | |
618 | .write = ifx_spi_write, | |
619 | .hangup = ifx_spi_hangup, | |
620 | .write_room = ifx_spi_write_room, | |
621 | .chars_in_buffer = ifx_spi_chars_in_buffer, | |
622 | .tiocmget = ifx_spi_tiocmget, | |
623 | .tiocmset = ifx_spi_tiocmset, | |
624 | }; | |
625 | ||
626 | /** | |
627 | * ifx_spi_insert_fip_string - queue received data | |
628 | * @ifx_ser: our SPI device | |
629 | * @chars: buffer we have received | |
630 | * @size: number of chars reeived | |
631 | * | |
632 | * Queue bytes to the tty assuming the tty side is currently open. If | |
633 | * not the discard the data. | |
634 | */ | |
635 | static void ifx_spi_insert_flip_string(struct ifx_spi_device *ifx_dev, | |
636 | unsigned char *chars, size_t size) | |
637 | { | |
05c7cd39 | 638 | tty_insert_flip_string(&ifx_dev->tty_port, chars, size); |
2e124b4a | 639 | tty_flip_buffer_push(&ifx_dev->tty_port); |
af3b8881 RG |
640 | } |
641 | ||
642 | /** | |
643 | * ifx_spi_complete - SPI transfer completed | |
644 | * @ctx: our SPI device | |
645 | * | |
646 | * An SPI transfer has completed. Process any received data and kick off | |
647 | * any further transmits we can commence. | |
648 | */ | |
649 | static void ifx_spi_complete(void *ctx) | |
650 | { | |
651 | struct ifx_spi_device *ifx_dev = ctx; | |
af3b8881 RG |
652 | int length; |
653 | int actual_length; | |
eeeabba0 | 654 | unsigned char more = 0; |
af3b8881 RG |
655 | unsigned char cts; |
656 | int local_write_pending = 0; | |
657 | int queue_length; | |
658 | int srdy; | |
659 | int decode_result; | |
660 | ||
661 | mrdy_set_low(ifx_dev); | |
662 | ||
663 | if (!ifx_dev->spi_msg.status) { | |
664 | /* check header validity, get comm flags */ | |
319fb0d2 | 665 | ifx_dev->swap_buf(ifx_dev->rx_buffer, IFX_SPI_HEADER_OVERHEAD, |
af3b8881 RG |
666 | &ifx_dev->rx_buffer[IFX_SPI_HEADER_OVERHEAD]); |
667 | decode_result = ifx_spi_decode_spi_header(ifx_dev->rx_buffer, | |
668 | &length, &more, &cts); | |
669 | if (decode_result == IFX_SPI_HEADER_0) { | |
670 | dev_dbg(&ifx_dev->spi_dev->dev, | |
671 | "ignore input: invalid header 0"); | |
672 | ifx_dev->spi_slave_cts = 0; | |
673 | goto complete_exit; | |
674 | } else if (decode_result == IFX_SPI_HEADER_F) { | |
675 | dev_dbg(&ifx_dev->spi_dev->dev, | |
676 | "ignore input: invalid header F"); | |
677 | goto complete_exit; | |
678 | } | |
679 | ||
680 | ifx_dev->spi_slave_cts = cts; | |
681 | ||
682 | actual_length = min((unsigned int)length, | |
683 | ifx_dev->spi_msg.actual_length); | |
319fb0d2 | 684 | ifx_dev->swap_buf( |
685 | (ifx_dev->rx_buffer + IFX_SPI_HEADER_OVERHEAD), | |
af3b8881 RG |
686 | actual_length, |
687 | &ifx_dev->rx_buffer[IFX_SPI_TRANSFER_SIZE]); | |
688 | ifx_spi_insert_flip_string( | |
689 | ifx_dev, | |
690 | ifx_dev->rx_buffer + IFX_SPI_HEADER_OVERHEAD, | |
691 | (size_t)actual_length); | |
692 | } else { | |
0b8053fe | 693 | more = 0; |
af3b8881 RG |
694 | dev_dbg(&ifx_dev->spi_dev->dev, "SPI transfer error %d", |
695 | ifx_dev->spi_msg.status); | |
696 | } | |
697 | ||
698 | complete_exit: | |
699 | if (ifx_dev->write_pending) { | |
700 | ifx_dev->write_pending = 0; | |
701 | local_write_pending = 1; | |
702 | } | |
703 | ||
704 | clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &(ifx_dev->flags)); | |
705 | ||
706 | queue_length = kfifo_len(&ifx_dev->tx_fifo); | |
707 | srdy = gpio_get_value(ifx_dev->gpio.srdy); | |
708 | if (!srdy) | |
709 | ifx_spi_power_state_clear(ifx_dev, IFX_SPI_POWER_SRDY); | |
710 | ||
711 | /* schedule output if there is more to do */ | |
712 | if (test_and_clear_bit(IFX_SPI_STATE_IO_READY, &ifx_dev->flags)) | |
713 | tasklet_schedule(&ifx_dev->io_work_tasklet); | |
714 | else { | |
715 | if (more || ifx_dev->spi_more || queue_length > 0 || | |
716 | local_write_pending) { | |
717 | if (ifx_dev->spi_slave_cts) { | |
718 | if (more) | |
719 | mrdy_assert(ifx_dev); | |
720 | } else | |
721 | mrdy_assert(ifx_dev); | |
722 | } else { | |
723 | /* | |
724 | * poke line discipline driver if any for more data | |
725 | * may or may not get more data to write | |
726 | * for now, say not busy | |
727 | */ | |
728 | ifx_spi_power_state_clear(ifx_dev, | |
729 | IFX_SPI_POWER_DATA_PENDING); | |
6aad04f2 | 730 | tty_port_tty_wakeup(&ifx_dev->tty_port); |
af3b8881 RG |
731 | } |
732 | } | |
733 | } | |
734 | ||
735 | /** | |
736 | * ifx_spio_io - I/O tasklet | |
737 | * @data: our SPI device | |
738 | * | |
739 | * Queue data for transmission if possible and then kick off the | |
740 | * transfer. | |
741 | */ | |
742 | static void ifx_spi_io(unsigned long data) | |
743 | { | |
744 | int retval; | |
745 | struct ifx_spi_device *ifx_dev = (struct ifx_spi_device *) data; | |
746 | ||
31fe9904 | 747 | if (!test_and_set_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags) && |
748 | test_bit(IFX_SPI_STATE_IO_AVAILABLE, &ifx_dev->flags)) { | |
af3b8881 RG |
749 | if (ifx_dev->gpio.unack_srdy_int_nb > 0) |
750 | ifx_dev->gpio.unack_srdy_int_nb--; | |
751 | ||
752 | ifx_spi_prepare_tx_buffer(ifx_dev); | |
753 | ||
754 | spi_message_init(&ifx_dev->spi_msg); | |
755 | INIT_LIST_HEAD(&ifx_dev->spi_msg.queue); | |
756 | ||
757 | ifx_dev->spi_msg.context = ifx_dev; | |
758 | ifx_dev->spi_msg.complete = ifx_spi_complete; | |
759 | ||
760 | /* set up our spi transfer */ | |
761 | /* note len is BYTES, not transfers */ | |
762 | ifx_dev->spi_xfer.len = IFX_SPI_TRANSFER_SIZE; | |
763 | ifx_dev->spi_xfer.cs_change = 0; | |
1b79b440 | 764 | ifx_dev->spi_xfer.speed_hz = ifx_dev->spi_dev->max_speed_hz; |
af3b8881 | 765 | /* ifx_dev->spi_xfer.speed_hz = 390625; */ |
5dd070d2 | 766 | ifx_dev->spi_xfer.bits_per_word = |
767 | ifx_dev->spi_dev->bits_per_word; | |
af3b8881 RG |
768 | |
769 | ifx_dev->spi_xfer.tx_buf = ifx_dev->tx_buffer; | |
770 | ifx_dev->spi_xfer.rx_buf = ifx_dev->rx_buffer; | |
771 | ||
772 | /* | |
773 | * setup dma pointers | |
774 | */ | |
2f1522ec | 775 | if (ifx_dev->use_dma) { |
af3b8881 RG |
776 | ifx_dev->spi_msg.is_dma_mapped = 1; |
777 | ifx_dev->tx_dma = ifx_dev->tx_bus; | |
778 | ifx_dev->rx_dma = ifx_dev->rx_bus; | |
779 | ifx_dev->spi_xfer.tx_dma = ifx_dev->tx_dma; | |
780 | ifx_dev->spi_xfer.rx_dma = ifx_dev->rx_dma; | |
781 | } else { | |
782 | ifx_dev->spi_msg.is_dma_mapped = 0; | |
783 | ifx_dev->tx_dma = (dma_addr_t)0; | |
784 | ifx_dev->rx_dma = (dma_addr_t)0; | |
785 | ifx_dev->spi_xfer.tx_dma = (dma_addr_t)0; | |
786 | ifx_dev->spi_xfer.rx_dma = (dma_addr_t)0; | |
787 | } | |
788 | ||
789 | spi_message_add_tail(&ifx_dev->spi_xfer, &ifx_dev->spi_msg); | |
790 | ||
791 | /* Assert MRDY. This may have already been done by the write | |
792 | * routine. | |
793 | */ | |
794 | mrdy_assert(ifx_dev); | |
795 | ||
796 | retval = spi_async(ifx_dev->spi_dev, &ifx_dev->spi_msg); | |
797 | if (retval) { | |
798 | clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS, | |
799 | &ifx_dev->flags); | |
800 | tasklet_schedule(&ifx_dev->io_work_tasklet); | |
801 | return; | |
802 | } | |
803 | } else | |
804 | ifx_dev->write_pending = 1; | |
805 | } | |
806 | ||
807 | /** | |
808 | * ifx_spi_free_port - free up the tty side | |
809 | * @ifx_dev: IFX device going away | |
810 | * | |
811 | * Unregister and free up a port when the device goes away | |
812 | */ | |
813 | static void ifx_spi_free_port(struct ifx_spi_device *ifx_dev) | |
814 | { | |
815 | if (ifx_dev->tty_dev) | |
816 | tty_unregister_device(tty_drv, ifx_dev->minor); | |
191c5f10 | 817 | tty_port_destroy(&ifx_dev->tty_port); |
af3b8881 RG |
818 | kfifo_free(&ifx_dev->tx_fifo); |
819 | } | |
820 | ||
821 | /** | |
822 | * ifx_spi_create_port - create a new port | |
823 | * @ifx_dev: our spi device | |
824 | * | |
825 | * Allocate and initialise the tty port that goes with this interface | |
826 | * and add it to the tty layer so that it can be opened. | |
827 | */ | |
828 | static int ifx_spi_create_port(struct ifx_spi_device *ifx_dev) | |
829 | { | |
830 | int ret = 0; | |
831 | struct tty_port *pport = &ifx_dev->tty_port; | |
832 | ||
833 | spin_lock_init(&ifx_dev->fifo_lock); | |
834 | lockdep_set_class_and_subclass(&ifx_dev->fifo_lock, | |
835 | &ifx_spi_key, 0); | |
836 | ||
837 | if (kfifo_alloc(&ifx_dev->tx_fifo, IFX_SPI_FIFO_SIZE, GFP_KERNEL)) { | |
838 | ret = -ENOMEM; | |
839 | goto error_ret; | |
840 | } | |
841 | ||
af3b8881 | 842 | tty_port_init(pport); |
b68f23b2 | 843 | pport->ops = &ifx_tty_port_ops; |
af3b8881 | 844 | ifx_dev->minor = IFX_SPI_TTY_ID; |
734cc178 JS |
845 | ifx_dev->tty_dev = tty_port_register_device(pport, tty_drv, |
846 | ifx_dev->minor, &ifx_dev->spi_dev->dev); | |
af3b8881 RG |
847 | if (IS_ERR(ifx_dev->tty_dev)) { |
848 | dev_dbg(&ifx_dev->spi_dev->dev, | |
849 | "%s: registering tty device failed", __func__); | |
850 | ret = PTR_ERR(ifx_dev->tty_dev); | |
191c5f10 | 851 | goto error_port; |
af3b8881 RG |
852 | } |
853 | return 0; | |
854 | ||
191c5f10 JS |
855 | error_port: |
856 | tty_port_destroy(pport); | |
af3b8881 RG |
857 | error_ret: |
858 | ifx_spi_free_port(ifx_dev); | |
859 | return ret; | |
860 | } | |
861 | ||
862 | /** | |
863 | * ifx_spi_handle_srdy - handle SRDY | |
864 | * @ifx_dev: device asserting SRDY | |
865 | * | |
866 | * Check our device state and see what we need to kick off when SRDY | |
867 | * is asserted. This usually means killing the timer and firing off the | |
868 | * I/O processing. | |
869 | */ | |
870 | static void ifx_spi_handle_srdy(struct ifx_spi_device *ifx_dev) | |
871 | { | |
872 | if (test_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags)) { | |
2e308026 | 873 | del_timer(&ifx_dev->spi_timer); |
af3b8881 RG |
874 | clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags); |
875 | } | |
876 | ||
877 | ifx_spi_power_state_set(ifx_dev, IFX_SPI_POWER_SRDY); | |
878 | ||
879 | if (!test_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags)) | |
880 | tasklet_schedule(&ifx_dev->io_work_tasklet); | |
881 | else | |
882 | set_bit(IFX_SPI_STATE_IO_READY, &ifx_dev->flags); | |
883 | } | |
884 | ||
885 | /** | |
886 | * ifx_spi_srdy_interrupt - SRDY asserted | |
887 | * @irq: our IRQ number | |
888 | * @dev: our ifx device | |
889 | * | |
890 | * The modem asserted SRDY. Handle the srdy event | |
891 | */ | |
892 | static irqreturn_t ifx_spi_srdy_interrupt(int irq, void *dev) | |
893 | { | |
894 | struct ifx_spi_device *ifx_dev = dev; | |
895 | ifx_dev->gpio.unack_srdy_int_nb++; | |
896 | ifx_spi_handle_srdy(ifx_dev); | |
897 | return IRQ_HANDLED; | |
898 | } | |
899 | ||
900 | /** | |
901 | * ifx_spi_reset_interrupt - Modem has changed reset state | |
902 | * @irq: interrupt number | |
903 | * @dev: our device pointer | |
904 | * | |
905 | * The modem has either entered or left reset state. Check the GPIO | |
906 | * line to see which. | |
907 | * | |
908 | * FIXME: review locking on MR_INPROGRESS versus | |
909 | * parallel unsolicited reset/solicited reset | |
910 | */ | |
911 | static irqreturn_t ifx_spi_reset_interrupt(int irq, void *dev) | |
912 | { | |
913 | struct ifx_spi_device *ifx_dev = dev; | |
914 | int val = gpio_get_value(ifx_dev->gpio.reset_out); | |
915 | int solreset = test_bit(MR_START, &ifx_dev->mdm_reset_state); | |
916 | ||
917 | if (val == 0) { | |
918 | /* entered reset */ | |
919 | set_bit(MR_INPROGRESS, &ifx_dev->mdm_reset_state); | |
920 | if (!solreset) { | |
921 | /* unsolicited reset */ | |
aa27a094 | 922 | tty_port_tty_hangup(&ifx_dev->tty_port, false); |
af3b8881 RG |
923 | } |
924 | } else { | |
925 | /* exited reset */ | |
926 | clear_bit(MR_INPROGRESS, &ifx_dev->mdm_reset_state); | |
927 | if (solreset) { | |
928 | set_bit(MR_COMPLETE, &ifx_dev->mdm_reset_state); | |
929 | wake_up(&ifx_dev->mdm_reset_wait); | |
930 | } | |
931 | } | |
932 | return IRQ_HANDLED; | |
933 | } | |
934 | ||
935 | /** | |
936 | * ifx_spi_free_device - free device | |
937 | * @ifx_dev: device to free | |
938 | * | |
939 | * Free the IFX device | |
940 | */ | |
941 | static void ifx_spi_free_device(struct ifx_spi_device *ifx_dev) | |
942 | { | |
943 | ifx_spi_free_port(ifx_dev); | |
944 | dma_free_coherent(&ifx_dev->spi_dev->dev, | |
945 | IFX_SPI_TRANSFER_SIZE, | |
946 | ifx_dev->tx_buffer, | |
947 | ifx_dev->tx_bus); | |
948 | dma_free_coherent(&ifx_dev->spi_dev->dev, | |
949 | IFX_SPI_TRANSFER_SIZE, | |
950 | ifx_dev->rx_buffer, | |
951 | ifx_dev->rx_bus); | |
952 | } | |
953 | ||
954 | /** | |
955 | * ifx_spi_reset - reset modem | |
956 | * @ifx_dev: modem to reset | |
957 | * | |
958 | * Perform a reset on the modem | |
959 | */ | |
960 | static int ifx_spi_reset(struct ifx_spi_device *ifx_dev) | |
961 | { | |
962 | int ret; | |
963 | /* | |
964 | * set up modem power, reset | |
965 | * | |
966 | * delays are required on some platforms for the modem | |
967 | * to reset properly | |
968 | */ | |
969 | set_bit(MR_START, &ifx_dev->mdm_reset_state); | |
970 | gpio_set_value(ifx_dev->gpio.po, 0); | |
971 | gpio_set_value(ifx_dev->gpio.reset, 0); | |
972 | msleep(25); | |
973 | gpio_set_value(ifx_dev->gpio.reset, 1); | |
974 | msleep(1); | |
975 | gpio_set_value(ifx_dev->gpio.po, 1); | |
976 | msleep(1); | |
977 | gpio_set_value(ifx_dev->gpio.po, 0); | |
978 | ret = wait_event_timeout(ifx_dev->mdm_reset_wait, | |
979 | test_bit(MR_COMPLETE, | |
980 | &ifx_dev->mdm_reset_state), | |
981 | IFX_RESET_TIMEOUT); | |
982 | if (!ret) | |
983 | dev_warn(&ifx_dev->spi_dev->dev, "Modem reset timeout: (state:%lx)", | |
984 | ifx_dev->mdm_reset_state); | |
985 | ||
986 | ifx_dev->mdm_reset_state = 0; | |
987 | return ret; | |
988 | } | |
989 | ||
990 | /** | |
991 | * ifx_spi_spi_probe - probe callback | |
992 | * @spi: our possible matching SPI device | |
993 | * | |
994 | * Probe for a 6x60 modem on SPI bus. Perform any needed device and | |
995 | * GPIO setup. | |
996 | * | |
997 | * FIXME: | |
998 | * - Support for multiple devices | |
999 | * - Split out MID specific GPIO handling eventually | |
1000 | */ | |
1001 | ||
1002 | static int ifx_spi_spi_probe(struct spi_device *spi) | |
1003 | { | |
1004 | int ret; | |
1005 | int srdy; | |
2f1522ec | 1006 | struct ifx_modem_platform_data *pl_data; |
af3b8881 RG |
1007 | struct ifx_spi_device *ifx_dev; |
1008 | ||
1009 | if (saved_ifx_dev) { | |
1010 | dev_dbg(&spi->dev, "ignoring subsequent detection"); | |
1011 | return -ENODEV; | |
1012 | } | |
1013 | ||
7a89c79a | 1014 | pl_data = dev_get_platdata(&spi->dev); |
2f1522ec RG |
1015 | if (!pl_data) { |
1016 | dev_err(&spi->dev, "missing platform data!"); | |
1017 | return -ENODEV; | |
1018 | } | |
1019 | ||
af3b8881 RG |
1020 | /* initialize structure to hold our device variables */ |
1021 | ifx_dev = kzalloc(sizeof(struct ifx_spi_device), GFP_KERNEL); | |
1022 | if (!ifx_dev) { | |
1023 | dev_err(&spi->dev, "spi device allocation failed"); | |
1024 | return -ENOMEM; | |
1025 | } | |
1026 | saved_ifx_dev = ifx_dev; | |
1027 | ifx_dev->spi_dev = spi; | |
1028 | clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags); | |
1029 | spin_lock_init(&ifx_dev->write_lock); | |
1030 | spin_lock_init(&ifx_dev->power_lock); | |
1031 | ifx_dev->power_status = 0; | |
1032 | init_timer(&ifx_dev->spi_timer); | |
1033 | ifx_dev->spi_timer.function = ifx_spi_timeout; | |
1034 | ifx_dev->spi_timer.data = (unsigned long)ifx_dev; | |
2f1522ec RG |
1035 | ifx_dev->modem = pl_data->modem_type; |
1036 | ifx_dev->use_dma = pl_data->use_dma; | |
1037 | ifx_dev->max_hz = pl_data->max_hz; | |
2aff8d90 | 1038 | /* initialize spi mode, etc */ |
1b79b440 | 1039 | spi->max_speed_hz = ifx_dev->max_hz; |
2aff8d90 RG |
1040 | spi->mode = IFX_SPI_MODE | (SPI_LOOP & spi->mode); |
1041 | spi->bits_per_word = spi_bpw; | |
1042 | ret = spi_setup(spi); | |
1043 | if (ret) { | |
1044 | dev_err(&spi->dev, "SPI setup wasn't successful %d", ret); | |
1045 | return -ENODEV; | |
1046 | } | |
af3b8881 | 1047 | |
319fb0d2 | 1048 | /* init swap_buf function according to word width configuration */ |
1049 | if (spi->bits_per_word == 32) | |
1050 | ifx_dev->swap_buf = swap_buf_32; | |
1051 | else if (spi->bits_per_word == 16) | |
1052 | ifx_dev->swap_buf = swap_buf_16; | |
1053 | else | |
1054 | ifx_dev->swap_buf = swap_buf_8; | |
1055 | ||
af3b8881 RG |
1056 | /* ensure SPI protocol flags are initialized to enable transfer */ |
1057 | ifx_dev->spi_more = 0; | |
1058 | ifx_dev->spi_slave_cts = 0; | |
1059 | ||
1060 | /*initialize transfer and dma buffers */ | |
5fc32495 | 1061 | ifx_dev->tx_buffer = dma_alloc_coherent(ifx_dev->spi_dev->dev.parent, |
af3b8881 RG |
1062 | IFX_SPI_TRANSFER_SIZE, |
1063 | &ifx_dev->tx_bus, | |
1064 | GFP_KERNEL); | |
1065 | if (!ifx_dev->tx_buffer) { | |
1066 | dev_err(&spi->dev, "DMA-TX buffer allocation failed"); | |
1067 | ret = -ENOMEM; | |
1068 | goto error_ret; | |
1069 | } | |
5fc32495 | 1070 | ifx_dev->rx_buffer = dma_alloc_coherent(ifx_dev->spi_dev->dev.parent, |
af3b8881 RG |
1071 | IFX_SPI_TRANSFER_SIZE, |
1072 | &ifx_dev->rx_bus, | |
1073 | GFP_KERNEL); | |
1074 | if (!ifx_dev->rx_buffer) { | |
1075 | dev_err(&spi->dev, "DMA-RX buffer allocation failed"); | |
1076 | ret = -ENOMEM; | |
1077 | goto error_ret; | |
1078 | } | |
1079 | ||
1080 | /* initialize waitq for modem reset */ | |
1081 | init_waitqueue_head(&ifx_dev->mdm_reset_wait); | |
1082 | ||
1083 | spi_set_drvdata(spi, ifx_dev); | |
1084 | tasklet_init(&ifx_dev->io_work_tasklet, ifx_spi_io, | |
1085 | (unsigned long)ifx_dev); | |
1086 | ||
1087 | set_bit(IFX_SPI_STATE_PRESENT, &ifx_dev->flags); | |
1088 | ||
1089 | /* create our tty port */ | |
1090 | ret = ifx_spi_create_port(ifx_dev); | |
1091 | if (ret != 0) { | |
1092 | dev_err(&spi->dev, "create default tty port failed"); | |
1093 | goto error_ret; | |
1094 | } | |
1095 | ||
2f1522ec RG |
1096 | ifx_dev->gpio.reset = pl_data->rst_pmu; |
1097 | ifx_dev->gpio.po = pl_data->pwr_on; | |
1098 | ifx_dev->gpio.mrdy = pl_data->mrdy; | |
1099 | ifx_dev->gpio.srdy = pl_data->srdy; | |
1100 | ifx_dev->gpio.reset_out = pl_data->rst_out; | |
af3b8881 RG |
1101 | |
1102 | dev_info(&spi->dev, "gpios %d, %d, %d, %d, %d", | |
1103 | ifx_dev->gpio.reset, ifx_dev->gpio.po, ifx_dev->gpio.mrdy, | |
1104 | ifx_dev->gpio.srdy, ifx_dev->gpio.reset_out); | |
1105 | ||
1106 | /* Configure gpios */ | |
1107 | ret = gpio_request(ifx_dev->gpio.reset, "ifxModem"); | |
1108 | if (ret < 0) { | |
1109 | dev_err(&spi->dev, "Unable to allocate GPIO%d (RESET)", | |
1110 | ifx_dev->gpio.reset); | |
1111 | goto error_ret; | |
1112 | } | |
1113 | ret += gpio_direction_output(ifx_dev->gpio.reset, 0); | |
1114 | ret += gpio_export(ifx_dev->gpio.reset, 1); | |
1115 | if (ret) { | |
1116 | dev_err(&spi->dev, "Unable to configure GPIO%d (RESET)", | |
1117 | ifx_dev->gpio.reset); | |
1118 | ret = -EBUSY; | |
1119 | goto error_ret2; | |
1120 | } | |
1121 | ||
1122 | ret = gpio_request(ifx_dev->gpio.po, "ifxModem"); | |
1123 | ret += gpio_direction_output(ifx_dev->gpio.po, 0); | |
1124 | ret += gpio_export(ifx_dev->gpio.po, 1); | |
1125 | if (ret) { | |
1126 | dev_err(&spi->dev, "Unable to configure GPIO%d (ON)", | |
1127 | ifx_dev->gpio.po); | |
1128 | ret = -EBUSY; | |
1129 | goto error_ret3; | |
1130 | } | |
1131 | ||
1132 | ret = gpio_request(ifx_dev->gpio.mrdy, "ifxModem"); | |
1133 | if (ret < 0) { | |
1134 | dev_err(&spi->dev, "Unable to allocate GPIO%d (MRDY)", | |
1135 | ifx_dev->gpio.mrdy); | |
1136 | goto error_ret3; | |
1137 | } | |
1138 | ret += gpio_export(ifx_dev->gpio.mrdy, 1); | |
1139 | ret += gpio_direction_output(ifx_dev->gpio.mrdy, 0); | |
1140 | if (ret) { | |
1141 | dev_err(&spi->dev, "Unable to configure GPIO%d (MRDY)", | |
1142 | ifx_dev->gpio.mrdy); | |
1143 | ret = -EBUSY; | |
1144 | goto error_ret4; | |
1145 | } | |
1146 | ||
1147 | ret = gpio_request(ifx_dev->gpio.srdy, "ifxModem"); | |
1148 | if (ret < 0) { | |
1149 | dev_err(&spi->dev, "Unable to allocate GPIO%d (SRDY)", | |
1150 | ifx_dev->gpio.srdy); | |
1151 | ret = -EBUSY; | |
1152 | goto error_ret4; | |
1153 | } | |
1154 | ret += gpio_export(ifx_dev->gpio.srdy, 1); | |
1155 | ret += gpio_direction_input(ifx_dev->gpio.srdy); | |
1156 | if (ret) { | |
1157 | dev_err(&spi->dev, "Unable to configure GPIO%d (SRDY)", | |
1158 | ifx_dev->gpio.srdy); | |
1159 | ret = -EBUSY; | |
1160 | goto error_ret5; | |
1161 | } | |
1162 | ||
1163 | ret = gpio_request(ifx_dev->gpio.reset_out, "ifxModem"); | |
1164 | if (ret < 0) { | |
1165 | dev_err(&spi->dev, "Unable to allocate GPIO%d (RESET_OUT)", | |
1166 | ifx_dev->gpio.reset_out); | |
1167 | goto error_ret5; | |
1168 | } | |
1169 | ret += gpio_export(ifx_dev->gpio.reset_out, 1); | |
1170 | ret += gpio_direction_input(ifx_dev->gpio.reset_out); | |
1171 | if (ret) { | |
1172 | dev_err(&spi->dev, "Unable to configure GPIO%d (RESET_OUT)", | |
1173 | ifx_dev->gpio.reset_out); | |
1174 | ret = -EBUSY; | |
1175 | goto error_ret6; | |
1176 | } | |
1177 | ||
1178 | ret = request_irq(gpio_to_irq(ifx_dev->gpio.reset_out), | |
1179 | ifx_spi_reset_interrupt, | |
1180 | IRQF_TRIGGER_RISING|IRQF_TRIGGER_FALLING, DRVNAME, | |
cbbcd1f3 | 1181 | ifx_dev); |
af3b8881 RG |
1182 | if (ret) { |
1183 | dev_err(&spi->dev, "Unable to get irq %x\n", | |
1184 | gpio_to_irq(ifx_dev->gpio.reset_out)); | |
1185 | goto error_ret6; | |
1186 | } | |
1187 | ||
1188 | ret = ifx_spi_reset(ifx_dev); | |
1189 | ||
1190 | ret = request_irq(gpio_to_irq(ifx_dev->gpio.srdy), | |
cbbcd1f3 GU |
1191 | ifx_spi_srdy_interrupt, IRQF_TRIGGER_RISING, DRVNAME, |
1192 | ifx_dev); | |
af3b8881 RG |
1193 | if (ret) { |
1194 | dev_err(&spi->dev, "Unable to get irq %x", | |
1195 | gpio_to_irq(ifx_dev->gpio.srdy)); | |
badb9533 | 1196 | goto error_ret7; |
af3b8881 RG |
1197 | } |
1198 | ||
1199 | /* set pm runtime power state and register with power system */ | |
1200 | pm_runtime_set_active(&spi->dev); | |
1201 | pm_runtime_enable(&spi->dev); | |
1202 | ||
1203 | /* handle case that modem is already signaling SRDY */ | |
1204 | /* no outgoing tty open at this point, this just satisfies the | |
1205 | * modem's read and should reset communication properly | |
1206 | */ | |
1207 | srdy = gpio_get_value(ifx_dev->gpio.srdy); | |
1208 | ||
1209 | if (srdy) { | |
1210 | mrdy_assert(ifx_dev); | |
1211 | ifx_spi_handle_srdy(ifx_dev); | |
1212 | } else | |
1213 | mrdy_set_low(ifx_dev); | |
1214 | return 0; | |
1215 | ||
badb9533 | 1216 | error_ret7: |
cbbcd1f3 | 1217 | free_irq(gpio_to_irq(ifx_dev->gpio.reset_out), ifx_dev); |
af3b8881 RG |
1218 | error_ret6: |
1219 | gpio_free(ifx_dev->gpio.srdy); | |
1220 | error_ret5: | |
1221 | gpio_free(ifx_dev->gpio.mrdy); | |
1222 | error_ret4: | |
1223 | gpio_free(ifx_dev->gpio.reset); | |
1224 | error_ret3: | |
1225 | gpio_free(ifx_dev->gpio.po); | |
1226 | error_ret2: | |
1227 | gpio_free(ifx_dev->gpio.reset_out); | |
1228 | error_ret: | |
1229 | ifx_spi_free_device(ifx_dev); | |
1230 | saved_ifx_dev = NULL; | |
1231 | return ret; | |
1232 | } | |
1233 | ||
1234 | /** | |
1235 | * ifx_spi_spi_remove - SPI device was removed | |
1236 | * @spi: SPI device | |
1237 | * | |
1238 | * FIXME: We should be shutting the device down here not in | |
1239 | * the module unload path. | |
1240 | */ | |
1241 | ||
1242 | static int ifx_spi_spi_remove(struct spi_device *spi) | |
1243 | { | |
1244 | struct ifx_spi_device *ifx_dev = spi_get_drvdata(spi); | |
1245 | /* stop activity */ | |
1246 | tasklet_kill(&ifx_dev->io_work_tasklet); | |
1247 | /* free irq */ | |
cbbcd1f3 GU |
1248 | free_irq(gpio_to_irq(ifx_dev->gpio.reset_out), ifx_dev); |
1249 | free_irq(gpio_to_irq(ifx_dev->gpio.srdy), ifx_dev); | |
af3b8881 RG |
1250 | |
1251 | gpio_free(ifx_dev->gpio.srdy); | |
1252 | gpio_free(ifx_dev->gpio.mrdy); | |
1253 | gpio_free(ifx_dev->gpio.reset); | |
1254 | gpio_free(ifx_dev->gpio.po); | |
1255 | gpio_free(ifx_dev->gpio.reset_out); | |
1256 | ||
1257 | /* free allocations */ | |
1258 | ifx_spi_free_device(ifx_dev); | |
1259 | ||
1260 | saved_ifx_dev = NULL; | |
1261 | return 0; | |
1262 | } | |
1263 | ||
1264 | /** | |
1265 | * ifx_spi_spi_shutdown - called on SPI shutdown | |
1266 | * @spi: SPI device | |
1267 | * | |
1268 | * No action needs to be taken here | |
1269 | */ | |
1270 | ||
1271 | static void ifx_spi_spi_shutdown(struct spi_device *spi) | |
1272 | { | |
72d4724e JC |
1273 | struct ifx_spi_device *ifx_dev = spi_get_drvdata(spi); |
1274 | ||
1275 | ifx_modem_power_off(ifx_dev); | |
af3b8881 RG |
1276 | } |
1277 | ||
1278 | /* | |
1279 | * various suspends and resumes have nothing to do | |
1280 | * no hardware to save state for | |
1281 | */ | |
1282 | ||
af3b8881 RG |
1283 | /** |
1284 | * ifx_spi_pm_suspend - suspend modem on system suspend | |
1285 | * @dev: device being suspended | |
1286 | * | |
1287 | * Suspend the modem. No action needed on Intel MID platforms, may | |
1288 | * need extending for other systems. | |
1289 | */ | |
1290 | static int ifx_spi_pm_suspend(struct device *dev) | |
1291 | { | |
1292 | return 0; | |
1293 | } | |
1294 | ||
1295 | /** | |
1296 | * ifx_spi_pm_resume - resume modem on system resume | |
1297 | * @dev: device being suspended | |
1298 | * | |
1299 | * Allow the modem to resume. No action needed. | |
1300 | * | |
1301 | * FIXME: do we need to reset anything here ? | |
1302 | */ | |
1303 | static int ifx_spi_pm_resume(struct device *dev) | |
1304 | { | |
1305 | return 0; | |
1306 | } | |
1307 | ||
1308 | /** | |
1309 | * ifx_spi_pm_runtime_resume - suspend modem | |
1310 | * @dev: device being suspended | |
1311 | * | |
1312 | * Allow the modem to resume. No action needed. | |
1313 | */ | |
1314 | static int ifx_spi_pm_runtime_resume(struct device *dev) | |
1315 | { | |
1316 | return 0; | |
1317 | } | |
1318 | ||
1319 | /** | |
1320 | * ifx_spi_pm_runtime_suspend - suspend modem | |
1321 | * @dev: device being suspended | |
1322 | * | |
1323 | * Allow the modem to suspend and thus suspend to continue up the | |
1324 | * device tree. | |
1325 | */ | |
1326 | static int ifx_spi_pm_runtime_suspend(struct device *dev) | |
1327 | { | |
1328 | return 0; | |
1329 | } | |
1330 | ||
1331 | /** | |
1332 | * ifx_spi_pm_runtime_idle - check if modem idle | |
1333 | * @dev: our device | |
1334 | * | |
1335 | * Check conditions and queue runtime suspend if idle. | |
1336 | */ | |
1337 | static int ifx_spi_pm_runtime_idle(struct device *dev) | |
1338 | { | |
1339 | struct spi_device *spi = to_spi_device(dev); | |
1340 | struct ifx_spi_device *ifx_dev = spi_get_drvdata(spi); | |
1341 | ||
1342 | if (!ifx_dev->power_status) | |
1343 | pm_runtime_suspend(dev); | |
1344 | ||
1345 | return 0; | |
1346 | } | |
1347 | ||
1348 | static const struct dev_pm_ops ifx_spi_pm = { | |
1349 | .resume = ifx_spi_pm_resume, | |
1350 | .suspend = ifx_spi_pm_suspend, | |
1351 | .runtime_resume = ifx_spi_pm_runtime_resume, | |
1352 | .runtime_suspend = ifx_spi_pm_runtime_suspend, | |
1353 | .runtime_idle = ifx_spi_pm_runtime_idle | |
1354 | }; | |
1355 | ||
1356 | static const struct spi_device_id ifx_id_table[] = { | |
1357 | {"ifx6160", 0}, | |
1358 | {"ifx6260", 0}, | |
1359 | { } | |
1360 | }; | |
1361 | MODULE_DEVICE_TABLE(spi, ifx_id_table); | |
1362 | ||
1363 | /* spi operations */ | |
7d9739cd | 1364 | static struct spi_driver ifx_spi_driver = { |
af3b8881 | 1365 | .driver = { |
8115be01 | 1366 | .name = DRVNAME, |
af3b8881 | 1367 | .pm = &ifx_spi_pm, |
3821a065 | 1368 | }, |
af3b8881 RG |
1369 | .probe = ifx_spi_spi_probe, |
1370 | .shutdown = ifx_spi_spi_shutdown, | |
2d47b716 | 1371 | .remove = ifx_spi_spi_remove, |
af3b8881 RG |
1372 | .id_table = ifx_id_table |
1373 | }; | |
1374 | ||
1375 | /** | |
1376 | * ifx_spi_exit - module exit | |
1377 | * | |
1378 | * Unload the module. | |
1379 | */ | |
1380 | ||
1381 | static void __exit ifx_spi_exit(void) | |
1382 | { | |
1383 | /* unregister */ | |
1384 | tty_unregister_driver(tty_drv); | |
72d4724e | 1385 | put_tty_driver(tty_drv); |
9a499db0 | 1386 | spi_unregister_driver(&ifx_spi_driver); |
72d4724e | 1387 | unregister_reboot_notifier(&ifx_modem_reboot_notifier_block); |
af3b8881 RG |
1388 | } |
1389 | ||
1390 | /** | |
1391 | * ifx_spi_init - module entry point | |
1392 | * | |
1393 | * Initialise the SPI and tty interfaces for the IFX SPI driver | |
1394 | * We need to initialize upper-edge spi driver after the tty | |
1395 | * driver because otherwise the spi probe will race | |
1396 | */ | |
1397 | ||
1398 | static int __init ifx_spi_init(void) | |
1399 | { | |
1400 | int result; | |
1401 | ||
1402 | tty_drv = alloc_tty_driver(1); | |
1403 | if (!tty_drv) { | |
1404 | pr_err("%s: alloc_tty_driver failed", DRVNAME); | |
1405 | return -ENOMEM; | |
1406 | } | |
1407 | ||
af3b8881 RG |
1408 | tty_drv->driver_name = DRVNAME; |
1409 | tty_drv->name = TTYNAME; | |
1410 | tty_drv->minor_start = IFX_SPI_TTY_ID; | |
af3b8881 RG |
1411 | tty_drv->type = TTY_DRIVER_TYPE_SERIAL; |
1412 | tty_drv->subtype = SERIAL_TYPE_NORMAL; | |
1413 | tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; | |
1414 | tty_drv->init_termios = tty_std_termios; | |
1415 | ||
1416 | tty_set_operations(tty_drv, &ifx_spi_serial_ops); | |
1417 | ||
1418 | result = tty_register_driver(tty_drv); | |
1419 | if (result) { | |
1420 | pr_err("%s: tty_register_driver failed(%d)", | |
1421 | DRVNAME, result); | |
72d4724e | 1422 | goto err_free_tty; |
af3b8881 RG |
1423 | } |
1424 | ||
9a499db0 | 1425 | result = spi_register_driver(&ifx_spi_driver); |
af3b8881 RG |
1426 | if (result) { |
1427 | pr_err("%s: spi_register_driver failed(%d)", | |
1428 | DRVNAME, result); | |
72d4724e JC |
1429 | goto err_unreg_tty; |
1430 | } | |
1431 | ||
1432 | result = register_reboot_notifier(&ifx_modem_reboot_notifier_block); | |
1433 | if (result) { | |
1434 | pr_err("%s: register ifx modem reboot notifier failed(%d)", | |
1435 | DRVNAME, result); | |
1436 | goto err_unreg_spi; | |
af3b8881 | 1437 | } |
72d4724e JC |
1438 | |
1439 | return 0; | |
1440 | err_unreg_spi: | |
9a499db0 | 1441 | spi_unregister_driver(&ifx_spi_driver); |
72d4724e JC |
1442 | err_unreg_tty: |
1443 | tty_unregister_driver(tty_drv); | |
1444 | err_free_tty: | |
1445 | put_tty_driver(tty_drv); | |
1446 | ||
af3b8881 RG |
1447 | return result; |
1448 | } | |
1449 | ||
1450 | module_init(ifx_spi_init); | |
1451 | module_exit(ifx_spi_exit); | |
1452 | ||
1453 | MODULE_AUTHOR("Intel"); | |
1454 | MODULE_DESCRIPTION("IFX6x60 spi driver"); | |
1455 | MODULE_LICENSE("GPL"); | |
1456 | MODULE_INFO(Version, "0.1-IFX6x60"); |