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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; | |
398 | return IFX_SPI_HEADER_0; | |
399 | } else if (h1 == 0xffff && h2 == 0xffff) { | |
400 | /* spi_slave_cts remains as it was */ | |
401 | return IFX_SPI_HEADER_F; | |
402 | } | |
403 | ||
404 | *length = h1 & 0xfff; /* upper bits of byte are flags */ | |
405 | *more = (buffer[1] >> IFX_SPI_MORE_BIT) & 1; | |
406 | *received_cts = (buffer[3] >> IFX_SPI_CTS_BIT) & 1; | |
407 | return 0; | |
408 | } | |
409 | ||
410 | /** | |
411 | * ifx_setup_spi_header - set header fields | |
412 | * @txbuffer: pointer to start of SPI buffer | |
413 | * @tx_count: bytes | |
414 | * @more: indicate if more to follow | |
415 | * | |
416 | * Format up an SPI header for a transfer | |
417 | * | |
418 | * FIXME: endianness? | |
419 | */ | |
420 | static void ifx_spi_setup_spi_header(unsigned char *txbuffer, int tx_count, | |
421 | unsigned char more) | |
422 | { | |
423 | *(u16 *)(txbuffer) = tx_count; | |
424 | *(u16 *)(txbuffer+2) = IFX_SPI_PAYLOAD_SIZE; | |
425 | txbuffer[1] |= (more << IFX_SPI_MORE_BIT) & IFX_SPI_MORE_MASK; | |
426 | } | |
427 | ||
af3b8881 RG |
428 | /** |
429 | * ifx_spi_prepare_tx_buffer - prepare transmit frame | |
430 | * @ifx_dev: our SPI device | |
431 | * | |
432 | * The transmit buffr needs a header and various other bits of | |
433 | * information followed by as much data as we can pull from the FIFO | |
434 | * and transfer. This function formats up a suitable buffer in the | |
435 | * ifx_dev->tx_buffer | |
436 | * | |
437 | * FIXME: performance - should we wake the tty when the queue is half | |
438 | * empty ? | |
439 | */ | |
440 | static int ifx_spi_prepare_tx_buffer(struct ifx_spi_device *ifx_dev) | |
441 | { | |
442 | int temp_count; | |
443 | int queue_length; | |
444 | int tx_count; | |
445 | unsigned char *tx_buffer; | |
446 | ||
447 | tx_buffer = ifx_dev->tx_buffer; | |
af3b8881 RG |
448 | |
449 | /* make room for required SPI header */ | |
450 | tx_buffer += IFX_SPI_HEADER_OVERHEAD; | |
451 | tx_count = IFX_SPI_HEADER_OVERHEAD; | |
452 | ||
453 | /* clear to signal no more data if this turns out to be the | |
454 | * last buffer sent in a sequence */ | |
455 | ifx_dev->spi_more = 0; | |
456 | ||
457 | /* if modem cts is set, just send empty buffer */ | |
458 | if (!ifx_dev->spi_slave_cts) { | |
459 | /* see if there's tx data */ | |
460 | queue_length = kfifo_len(&ifx_dev->tx_fifo); | |
461 | if (queue_length != 0) { | |
462 | /* data to mux -- see if there's room for it */ | |
463 | temp_count = min(queue_length, IFX_SPI_PAYLOAD_SIZE); | |
464 | temp_count = kfifo_out_locked(&ifx_dev->tx_fifo, | |
465 | tx_buffer, temp_count, | |
466 | &ifx_dev->fifo_lock); | |
467 | ||
468 | /* update buffer pointer and data count in message */ | |
469 | tx_buffer += temp_count; | |
470 | tx_count += temp_count; | |
471 | if (temp_count == queue_length) | |
472 | /* poke port to get more data */ | |
6aad04f2 | 473 | tty_port_tty_wakeup(&ifx_dev->tty_port); |
af3b8881 RG |
474 | else /* more data in port, use next SPI message */ |
475 | ifx_dev->spi_more = 1; | |
476 | } | |
477 | } | |
478 | /* have data and info for header -- set up SPI header in buffer */ | |
479 | /* spi header needs payload size, not entire buffer size */ | |
480 | ifx_spi_setup_spi_header(ifx_dev->tx_buffer, | |
481 | tx_count-IFX_SPI_HEADER_OVERHEAD, | |
482 | ifx_dev->spi_more); | |
483 | /* swap actual data in the buffer */ | |
319fb0d2 | 484 | ifx_dev->swap_buf((ifx_dev->tx_buffer), tx_count, |
af3b8881 RG |
485 | &ifx_dev->tx_buffer[IFX_SPI_TRANSFER_SIZE]); |
486 | return tx_count; | |
487 | } | |
488 | ||
489 | /** | |
490 | * ifx_spi_write - line discipline write | |
491 | * @tty: our tty device | |
492 | * @buf: pointer to buffer to write (kernel space) | |
493 | * @count: size of buffer | |
494 | * | |
495 | * Write the characters we have been given into the FIFO. If the device | |
496 | * is not active then activate it, when the SRDY line is asserted back | |
497 | * this will commence I/O | |
498 | */ | |
499 | static int ifx_spi_write(struct tty_struct *tty, const unsigned char *buf, | |
500 | int count) | |
501 | { | |
502 | struct ifx_spi_device *ifx_dev = tty->driver_data; | |
503 | unsigned char *tmp_buf = (unsigned char *)buf; | |
e8823f1c JC |
504 | unsigned long flags; |
505 | bool is_fifo_empty; | |
bc6835a4 | 506 | int tx_count; |
e8823f1c JC |
507 | |
508 | spin_lock_irqsave(&ifx_dev->fifo_lock, flags); | |
509 | is_fifo_empty = kfifo_is_empty(&ifx_dev->tx_fifo); | |
bc6835a4 | 510 | tx_count = kfifo_in(&ifx_dev->tx_fifo, tmp_buf, count); |
e8823f1c JC |
511 | spin_unlock_irqrestore(&ifx_dev->fifo_lock, flags); |
512 | if (is_fifo_empty) | |
513 | mrdy_assert(ifx_dev); | |
514 | ||
af3b8881 RG |
515 | return tx_count; |
516 | } | |
517 | ||
518 | /** | |
519 | * ifx_spi_chars_in_buffer - line discipline helper | |
520 | * @tty: our tty device | |
521 | * | |
522 | * Report how much data we can accept before we drop bytes. As we use | |
523 | * a simple FIFO this is nice and easy. | |
524 | */ | |
525 | static int ifx_spi_write_room(struct tty_struct *tty) | |
526 | { | |
527 | struct ifx_spi_device *ifx_dev = tty->driver_data; | |
528 | return IFX_SPI_FIFO_SIZE - kfifo_len(&ifx_dev->tx_fifo); | |
529 | } | |
530 | ||
531 | /** | |
532 | * ifx_spi_chars_in_buffer - line discipline helper | |
533 | * @tty: our tty device | |
534 | * | |
535 | * Report how many characters we have buffered. In our case this is the | |
536 | * number of bytes sitting in our transmit FIFO. | |
537 | */ | |
538 | static int ifx_spi_chars_in_buffer(struct tty_struct *tty) | |
539 | { | |
540 | struct ifx_spi_device *ifx_dev = tty->driver_data; | |
541 | return kfifo_len(&ifx_dev->tx_fifo); | |
542 | } | |
543 | ||
544 | /** | |
545 | * ifx_port_hangup | |
546 | * @port: our tty port | |
547 | * | |
548 | * tty port hang up. Called when tty_hangup processing is invoked either | |
549 | * by loss of carrier, or by software (eg vhangup). Serialized against | |
550 | * activate/shutdown by the tty layer. | |
551 | */ | |
552 | static void ifx_spi_hangup(struct tty_struct *tty) | |
553 | { | |
554 | struct ifx_spi_device *ifx_dev = tty->driver_data; | |
555 | tty_port_hangup(&ifx_dev->tty_port); | |
556 | } | |
557 | ||
558 | /** | |
559 | * ifx_port_activate | |
560 | * @port: our tty port | |
561 | * | |
562 | * tty port activate method - called for first open. Serialized | |
563 | * with hangup and shutdown by the tty layer. | |
564 | */ | |
565 | static int ifx_port_activate(struct tty_port *port, struct tty_struct *tty) | |
566 | { | |
567 | struct ifx_spi_device *ifx_dev = | |
568 | container_of(port, struct ifx_spi_device, tty_port); | |
569 | ||
570 | /* clear any old data; can't do this in 'close' */ | |
571 | kfifo_reset(&ifx_dev->tx_fifo); | |
572 | ||
31fe9904 | 573 | /* clear any flag which may be set in port shutdown procedure */ |
574 | clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags); | |
575 | clear_bit(IFX_SPI_STATE_IO_READY, &ifx_dev->flags); | |
576 | ||
af3b8881 RG |
577 | /* put port data into this tty */ |
578 | tty->driver_data = ifx_dev; | |
579 | ||
580 | /* allows flip string push from int context */ | |
d6c53c0e | 581 | port->low_latency = 1; |
af3b8881 | 582 | |
31fe9904 | 583 | /* set flag to allows data transfer */ |
584 | set_bit(IFX_SPI_STATE_IO_AVAILABLE, &ifx_dev->flags); | |
585 | ||
af3b8881 RG |
586 | return 0; |
587 | } | |
588 | ||
589 | /** | |
590 | * ifx_port_shutdown | |
591 | * @port: our tty port | |
592 | * | |
593 | * tty port shutdown method - called for last port close. Serialized | |
594 | * with hangup and activate by the tty layer. | |
595 | */ | |
596 | static void ifx_port_shutdown(struct tty_port *port) | |
597 | { | |
598 | struct ifx_spi_device *ifx_dev = | |
599 | container_of(port, struct ifx_spi_device, tty_port); | |
600 | ||
31fe9904 | 601 | clear_bit(IFX_SPI_STATE_IO_AVAILABLE, &ifx_dev->flags); |
af3b8881 | 602 | mrdy_set_low(ifx_dev); |
014b9b4c | 603 | del_timer(&ifx_dev->spi_timer); |
af3b8881 RG |
604 | clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags); |
605 | tasklet_kill(&ifx_dev->io_work_tasklet); | |
606 | } | |
607 | ||
608 | static const struct tty_port_operations ifx_tty_port_ops = { | |
609 | .activate = ifx_port_activate, | |
610 | .shutdown = ifx_port_shutdown, | |
611 | }; | |
612 | ||
613 | static const struct tty_operations ifx_spi_serial_ops = { | |
614 | .open = ifx_spi_open, | |
615 | .close = ifx_spi_close, | |
616 | .write = ifx_spi_write, | |
617 | .hangup = ifx_spi_hangup, | |
618 | .write_room = ifx_spi_write_room, | |
619 | .chars_in_buffer = ifx_spi_chars_in_buffer, | |
620 | .tiocmget = ifx_spi_tiocmget, | |
621 | .tiocmset = ifx_spi_tiocmset, | |
622 | }; | |
623 | ||
624 | /** | |
625 | * ifx_spi_insert_fip_string - queue received data | |
626 | * @ifx_ser: our SPI device | |
627 | * @chars: buffer we have received | |
628 | * @size: number of chars reeived | |
629 | * | |
630 | * Queue bytes to the tty assuming the tty side is currently open. If | |
631 | * not the discard the data. | |
632 | */ | |
633 | static void ifx_spi_insert_flip_string(struct ifx_spi_device *ifx_dev, | |
634 | unsigned char *chars, size_t size) | |
635 | { | |
05c7cd39 | 636 | tty_insert_flip_string(&ifx_dev->tty_port, chars, size); |
2e124b4a | 637 | tty_flip_buffer_push(&ifx_dev->tty_port); |
af3b8881 RG |
638 | } |
639 | ||
640 | /** | |
641 | * ifx_spi_complete - SPI transfer completed | |
642 | * @ctx: our SPI device | |
643 | * | |
644 | * An SPI transfer has completed. Process any received data and kick off | |
645 | * any further transmits we can commence. | |
646 | */ | |
647 | static void ifx_spi_complete(void *ctx) | |
648 | { | |
649 | struct ifx_spi_device *ifx_dev = ctx; | |
af3b8881 RG |
650 | int length; |
651 | int actual_length; | |
652 | unsigned char more; | |
653 | unsigned char cts; | |
654 | int local_write_pending = 0; | |
655 | int queue_length; | |
656 | int srdy; | |
657 | int decode_result; | |
658 | ||
659 | mrdy_set_low(ifx_dev); | |
660 | ||
661 | if (!ifx_dev->spi_msg.status) { | |
662 | /* check header validity, get comm flags */ | |
319fb0d2 | 663 | ifx_dev->swap_buf(ifx_dev->rx_buffer, IFX_SPI_HEADER_OVERHEAD, |
af3b8881 RG |
664 | &ifx_dev->rx_buffer[IFX_SPI_HEADER_OVERHEAD]); |
665 | decode_result = ifx_spi_decode_spi_header(ifx_dev->rx_buffer, | |
666 | &length, &more, &cts); | |
667 | if (decode_result == IFX_SPI_HEADER_0) { | |
668 | dev_dbg(&ifx_dev->spi_dev->dev, | |
669 | "ignore input: invalid header 0"); | |
670 | ifx_dev->spi_slave_cts = 0; | |
671 | goto complete_exit; | |
672 | } else if (decode_result == IFX_SPI_HEADER_F) { | |
673 | dev_dbg(&ifx_dev->spi_dev->dev, | |
674 | "ignore input: invalid header F"); | |
675 | goto complete_exit; | |
676 | } | |
677 | ||
678 | ifx_dev->spi_slave_cts = cts; | |
679 | ||
680 | actual_length = min((unsigned int)length, | |
681 | ifx_dev->spi_msg.actual_length); | |
319fb0d2 | 682 | ifx_dev->swap_buf( |
683 | (ifx_dev->rx_buffer + IFX_SPI_HEADER_OVERHEAD), | |
af3b8881 RG |
684 | actual_length, |
685 | &ifx_dev->rx_buffer[IFX_SPI_TRANSFER_SIZE]); | |
686 | ifx_spi_insert_flip_string( | |
687 | ifx_dev, | |
688 | ifx_dev->rx_buffer + IFX_SPI_HEADER_OVERHEAD, | |
689 | (size_t)actual_length); | |
690 | } else { | |
691 | dev_dbg(&ifx_dev->spi_dev->dev, "SPI transfer error %d", | |
692 | ifx_dev->spi_msg.status); | |
693 | } | |
694 | ||
695 | complete_exit: | |
696 | if (ifx_dev->write_pending) { | |
697 | ifx_dev->write_pending = 0; | |
698 | local_write_pending = 1; | |
699 | } | |
700 | ||
701 | clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &(ifx_dev->flags)); | |
702 | ||
703 | queue_length = kfifo_len(&ifx_dev->tx_fifo); | |
704 | srdy = gpio_get_value(ifx_dev->gpio.srdy); | |
705 | if (!srdy) | |
706 | ifx_spi_power_state_clear(ifx_dev, IFX_SPI_POWER_SRDY); | |
707 | ||
708 | /* schedule output if there is more to do */ | |
709 | if (test_and_clear_bit(IFX_SPI_STATE_IO_READY, &ifx_dev->flags)) | |
710 | tasklet_schedule(&ifx_dev->io_work_tasklet); | |
711 | else { | |
712 | if (more || ifx_dev->spi_more || queue_length > 0 || | |
713 | local_write_pending) { | |
714 | if (ifx_dev->spi_slave_cts) { | |
715 | if (more) | |
716 | mrdy_assert(ifx_dev); | |
717 | } else | |
718 | mrdy_assert(ifx_dev); | |
719 | } else { | |
720 | /* | |
721 | * poke line discipline driver if any for more data | |
722 | * may or may not get more data to write | |
723 | * for now, say not busy | |
724 | */ | |
725 | ifx_spi_power_state_clear(ifx_dev, | |
726 | IFX_SPI_POWER_DATA_PENDING); | |
6aad04f2 | 727 | tty_port_tty_wakeup(&ifx_dev->tty_port); |
af3b8881 RG |
728 | } |
729 | } | |
730 | } | |
731 | ||
732 | /** | |
733 | * ifx_spio_io - I/O tasklet | |
734 | * @data: our SPI device | |
735 | * | |
736 | * Queue data for transmission if possible and then kick off the | |
737 | * transfer. | |
738 | */ | |
739 | static void ifx_spi_io(unsigned long data) | |
740 | { | |
741 | int retval; | |
742 | struct ifx_spi_device *ifx_dev = (struct ifx_spi_device *) data; | |
743 | ||
31fe9904 | 744 | if (!test_and_set_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags) && |
745 | test_bit(IFX_SPI_STATE_IO_AVAILABLE, &ifx_dev->flags)) { | |
af3b8881 RG |
746 | if (ifx_dev->gpio.unack_srdy_int_nb > 0) |
747 | ifx_dev->gpio.unack_srdy_int_nb--; | |
748 | ||
749 | ifx_spi_prepare_tx_buffer(ifx_dev); | |
750 | ||
751 | spi_message_init(&ifx_dev->spi_msg); | |
752 | INIT_LIST_HEAD(&ifx_dev->spi_msg.queue); | |
753 | ||
754 | ifx_dev->spi_msg.context = ifx_dev; | |
755 | ifx_dev->spi_msg.complete = ifx_spi_complete; | |
756 | ||
757 | /* set up our spi transfer */ | |
758 | /* note len is BYTES, not transfers */ | |
759 | ifx_dev->spi_xfer.len = IFX_SPI_TRANSFER_SIZE; | |
760 | ifx_dev->spi_xfer.cs_change = 0; | |
1b79b440 | 761 | ifx_dev->spi_xfer.speed_hz = ifx_dev->spi_dev->max_speed_hz; |
af3b8881 | 762 | /* ifx_dev->spi_xfer.speed_hz = 390625; */ |
5dd070d2 | 763 | ifx_dev->spi_xfer.bits_per_word = |
764 | ifx_dev->spi_dev->bits_per_word; | |
af3b8881 RG |
765 | |
766 | ifx_dev->spi_xfer.tx_buf = ifx_dev->tx_buffer; | |
767 | ifx_dev->spi_xfer.rx_buf = ifx_dev->rx_buffer; | |
768 | ||
769 | /* | |
770 | * setup dma pointers | |
771 | */ | |
2f1522ec | 772 | if (ifx_dev->use_dma) { |
af3b8881 RG |
773 | ifx_dev->spi_msg.is_dma_mapped = 1; |
774 | ifx_dev->tx_dma = ifx_dev->tx_bus; | |
775 | ifx_dev->rx_dma = ifx_dev->rx_bus; | |
776 | ifx_dev->spi_xfer.tx_dma = ifx_dev->tx_dma; | |
777 | ifx_dev->spi_xfer.rx_dma = ifx_dev->rx_dma; | |
778 | } else { | |
779 | ifx_dev->spi_msg.is_dma_mapped = 0; | |
780 | ifx_dev->tx_dma = (dma_addr_t)0; | |
781 | ifx_dev->rx_dma = (dma_addr_t)0; | |
782 | ifx_dev->spi_xfer.tx_dma = (dma_addr_t)0; | |
783 | ifx_dev->spi_xfer.rx_dma = (dma_addr_t)0; | |
784 | } | |
785 | ||
786 | spi_message_add_tail(&ifx_dev->spi_xfer, &ifx_dev->spi_msg); | |
787 | ||
788 | /* Assert MRDY. This may have already been done by the write | |
789 | * routine. | |
790 | */ | |
791 | mrdy_assert(ifx_dev); | |
792 | ||
793 | retval = spi_async(ifx_dev->spi_dev, &ifx_dev->spi_msg); | |
794 | if (retval) { | |
795 | clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS, | |
796 | &ifx_dev->flags); | |
797 | tasklet_schedule(&ifx_dev->io_work_tasklet); | |
798 | return; | |
799 | } | |
800 | } else | |
801 | ifx_dev->write_pending = 1; | |
802 | } | |
803 | ||
804 | /** | |
805 | * ifx_spi_free_port - free up the tty side | |
806 | * @ifx_dev: IFX device going away | |
807 | * | |
808 | * Unregister and free up a port when the device goes away | |
809 | */ | |
810 | static void ifx_spi_free_port(struct ifx_spi_device *ifx_dev) | |
811 | { | |
812 | if (ifx_dev->tty_dev) | |
813 | tty_unregister_device(tty_drv, ifx_dev->minor); | |
191c5f10 | 814 | tty_port_destroy(&ifx_dev->tty_port); |
af3b8881 RG |
815 | kfifo_free(&ifx_dev->tx_fifo); |
816 | } | |
817 | ||
818 | /** | |
819 | * ifx_spi_create_port - create a new port | |
820 | * @ifx_dev: our spi device | |
821 | * | |
822 | * Allocate and initialise the tty port that goes with this interface | |
823 | * and add it to the tty layer so that it can be opened. | |
824 | */ | |
825 | static int ifx_spi_create_port(struct ifx_spi_device *ifx_dev) | |
826 | { | |
827 | int ret = 0; | |
828 | struct tty_port *pport = &ifx_dev->tty_port; | |
829 | ||
830 | spin_lock_init(&ifx_dev->fifo_lock); | |
831 | lockdep_set_class_and_subclass(&ifx_dev->fifo_lock, | |
832 | &ifx_spi_key, 0); | |
833 | ||
834 | if (kfifo_alloc(&ifx_dev->tx_fifo, IFX_SPI_FIFO_SIZE, GFP_KERNEL)) { | |
835 | ret = -ENOMEM; | |
836 | goto error_ret; | |
837 | } | |
838 | ||
af3b8881 | 839 | tty_port_init(pport); |
b68f23b2 | 840 | pport->ops = &ifx_tty_port_ops; |
af3b8881 | 841 | ifx_dev->minor = IFX_SPI_TTY_ID; |
734cc178 JS |
842 | ifx_dev->tty_dev = tty_port_register_device(pport, tty_drv, |
843 | ifx_dev->minor, &ifx_dev->spi_dev->dev); | |
af3b8881 RG |
844 | if (IS_ERR(ifx_dev->tty_dev)) { |
845 | dev_dbg(&ifx_dev->spi_dev->dev, | |
846 | "%s: registering tty device failed", __func__); | |
847 | ret = PTR_ERR(ifx_dev->tty_dev); | |
191c5f10 | 848 | goto error_port; |
af3b8881 RG |
849 | } |
850 | return 0; | |
851 | ||
191c5f10 JS |
852 | error_port: |
853 | tty_port_destroy(pport); | |
af3b8881 RG |
854 | error_ret: |
855 | ifx_spi_free_port(ifx_dev); | |
856 | return ret; | |
857 | } | |
858 | ||
859 | /** | |
860 | * ifx_spi_handle_srdy - handle SRDY | |
861 | * @ifx_dev: device asserting SRDY | |
862 | * | |
863 | * Check our device state and see what we need to kick off when SRDY | |
864 | * is asserted. This usually means killing the timer and firing off the | |
865 | * I/O processing. | |
866 | */ | |
867 | static void ifx_spi_handle_srdy(struct ifx_spi_device *ifx_dev) | |
868 | { | |
869 | if (test_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags)) { | |
2e308026 | 870 | del_timer(&ifx_dev->spi_timer); |
af3b8881 RG |
871 | clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags); |
872 | } | |
873 | ||
874 | ifx_spi_power_state_set(ifx_dev, IFX_SPI_POWER_SRDY); | |
875 | ||
876 | if (!test_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags)) | |
877 | tasklet_schedule(&ifx_dev->io_work_tasklet); | |
878 | else | |
879 | set_bit(IFX_SPI_STATE_IO_READY, &ifx_dev->flags); | |
880 | } | |
881 | ||
882 | /** | |
883 | * ifx_spi_srdy_interrupt - SRDY asserted | |
884 | * @irq: our IRQ number | |
885 | * @dev: our ifx device | |
886 | * | |
887 | * The modem asserted SRDY. Handle the srdy event | |
888 | */ | |
889 | static irqreturn_t ifx_spi_srdy_interrupt(int irq, void *dev) | |
890 | { | |
891 | struct ifx_spi_device *ifx_dev = dev; | |
892 | ifx_dev->gpio.unack_srdy_int_nb++; | |
893 | ifx_spi_handle_srdy(ifx_dev); | |
894 | return IRQ_HANDLED; | |
895 | } | |
896 | ||
897 | /** | |
898 | * ifx_spi_reset_interrupt - Modem has changed reset state | |
899 | * @irq: interrupt number | |
900 | * @dev: our device pointer | |
901 | * | |
902 | * The modem has either entered or left reset state. Check the GPIO | |
903 | * line to see which. | |
904 | * | |
905 | * FIXME: review locking on MR_INPROGRESS versus | |
906 | * parallel unsolicited reset/solicited reset | |
907 | */ | |
908 | static irqreturn_t ifx_spi_reset_interrupt(int irq, void *dev) | |
909 | { | |
910 | struct ifx_spi_device *ifx_dev = dev; | |
911 | int val = gpio_get_value(ifx_dev->gpio.reset_out); | |
912 | int solreset = test_bit(MR_START, &ifx_dev->mdm_reset_state); | |
913 | ||
914 | if (val == 0) { | |
915 | /* entered reset */ | |
916 | set_bit(MR_INPROGRESS, &ifx_dev->mdm_reset_state); | |
917 | if (!solreset) { | |
918 | /* unsolicited reset */ | |
aa27a094 | 919 | tty_port_tty_hangup(&ifx_dev->tty_port, false); |
af3b8881 RG |
920 | } |
921 | } else { | |
922 | /* exited reset */ | |
923 | clear_bit(MR_INPROGRESS, &ifx_dev->mdm_reset_state); | |
924 | if (solreset) { | |
925 | set_bit(MR_COMPLETE, &ifx_dev->mdm_reset_state); | |
926 | wake_up(&ifx_dev->mdm_reset_wait); | |
927 | } | |
928 | } | |
929 | return IRQ_HANDLED; | |
930 | } | |
931 | ||
932 | /** | |
933 | * ifx_spi_free_device - free device | |
934 | * @ifx_dev: device to free | |
935 | * | |
936 | * Free the IFX device | |
937 | */ | |
938 | static void ifx_spi_free_device(struct ifx_spi_device *ifx_dev) | |
939 | { | |
940 | ifx_spi_free_port(ifx_dev); | |
941 | dma_free_coherent(&ifx_dev->spi_dev->dev, | |
942 | IFX_SPI_TRANSFER_SIZE, | |
943 | ifx_dev->tx_buffer, | |
944 | ifx_dev->tx_bus); | |
945 | dma_free_coherent(&ifx_dev->spi_dev->dev, | |
946 | IFX_SPI_TRANSFER_SIZE, | |
947 | ifx_dev->rx_buffer, | |
948 | ifx_dev->rx_bus); | |
949 | } | |
950 | ||
951 | /** | |
952 | * ifx_spi_reset - reset modem | |
953 | * @ifx_dev: modem to reset | |
954 | * | |
955 | * Perform a reset on the modem | |
956 | */ | |
957 | static int ifx_spi_reset(struct ifx_spi_device *ifx_dev) | |
958 | { | |
959 | int ret; | |
960 | /* | |
961 | * set up modem power, reset | |
962 | * | |
963 | * delays are required on some platforms for the modem | |
964 | * to reset properly | |
965 | */ | |
966 | set_bit(MR_START, &ifx_dev->mdm_reset_state); | |
967 | gpio_set_value(ifx_dev->gpio.po, 0); | |
968 | gpio_set_value(ifx_dev->gpio.reset, 0); | |
969 | msleep(25); | |
970 | gpio_set_value(ifx_dev->gpio.reset, 1); | |
971 | msleep(1); | |
972 | gpio_set_value(ifx_dev->gpio.po, 1); | |
973 | msleep(1); | |
974 | gpio_set_value(ifx_dev->gpio.po, 0); | |
975 | ret = wait_event_timeout(ifx_dev->mdm_reset_wait, | |
976 | test_bit(MR_COMPLETE, | |
977 | &ifx_dev->mdm_reset_state), | |
978 | IFX_RESET_TIMEOUT); | |
979 | if (!ret) | |
980 | dev_warn(&ifx_dev->spi_dev->dev, "Modem reset timeout: (state:%lx)", | |
981 | ifx_dev->mdm_reset_state); | |
982 | ||
983 | ifx_dev->mdm_reset_state = 0; | |
984 | return ret; | |
985 | } | |
986 | ||
987 | /** | |
988 | * ifx_spi_spi_probe - probe callback | |
989 | * @spi: our possible matching SPI device | |
990 | * | |
991 | * Probe for a 6x60 modem on SPI bus. Perform any needed device and | |
992 | * GPIO setup. | |
993 | * | |
994 | * FIXME: | |
995 | * - Support for multiple devices | |
996 | * - Split out MID specific GPIO handling eventually | |
997 | */ | |
998 | ||
999 | static int ifx_spi_spi_probe(struct spi_device *spi) | |
1000 | { | |
1001 | int ret; | |
1002 | int srdy; | |
2f1522ec | 1003 | struct ifx_modem_platform_data *pl_data; |
af3b8881 RG |
1004 | struct ifx_spi_device *ifx_dev; |
1005 | ||
1006 | if (saved_ifx_dev) { | |
1007 | dev_dbg(&spi->dev, "ignoring subsequent detection"); | |
1008 | return -ENODEV; | |
1009 | } | |
1010 | ||
7a89c79a | 1011 | pl_data = dev_get_platdata(&spi->dev); |
2f1522ec RG |
1012 | if (!pl_data) { |
1013 | dev_err(&spi->dev, "missing platform data!"); | |
1014 | return -ENODEV; | |
1015 | } | |
1016 | ||
af3b8881 RG |
1017 | /* initialize structure to hold our device variables */ |
1018 | ifx_dev = kzalloc(sizeof(struct ifx_spi_device), GFP_KERNEL); | |
1019 | if (!ifx_dev) { | |
1020 | dev_err(&spi->dev, "spi device allocation failed"); | |
1021 | return -ENOMEM; | |
1022 | } | |
1023 | saved_ifx_dev = ifx_dev; | |
1024 | ifx_dev->spi_dev = spi; | |
1025 | clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags); | |
1026 | spin_lock_init(&ifx_dev->write_lock); | |
1027 | spin_lock_init(&ifx_dev->power_lock); | |
1028 | ifx_dev->power_status = 0; | |
1029 | init_timer(&ifx_dev->spi_timer); | |
1030 | ifx_dev->spi_timer.function = ifx_spi_timeout; | |
1031 | ifx_dev->spi_timer.data = (unsigned long)ifx_dev; | |
2f1522ec RG |
1032 | ifx_dev->modem = pl_data->modem_type; |
1033 | ifx_dev->use_dma = pl_data->use_dma; | |
1034 | ifx_dev->max_hz = pl_data->max_hz; | |
2aff8d90 | 1035 | /* initialize spi mode, etc */ |
1b79b440 | 1036 | spi->max_speed_hz = ifx_dev->max_hz; |
2aff8d90 RG |
1037 | spi->mode = IFX_SPI_MODE | (SPI_LOOP & spi->mode); |
1038 | spi->bits_per_word = spi_bpw; | |
1039 | ret = spi_setup(spi); | |
1040 | if (ret) { | |
1041 | dev_err(&spi->dev, "SPI setup wasn't successful %d", ret); | |
1042 | return -ENODEV; | |
1043 | } | |
af3b8881 | 1044 | |
319fb0d2 | 1045 | /* init swap_buf function according to word width configuration */ |
1046 | if (spi->bits_per_word == 32) | |
1047 | ifx_dev->swap_buf = swap_buf_32; | |
1048 | else if (spi->bits_per_word == 16) | |
1049 | ifx_dev->swap_buf = swap_buf_16; | |
1050 | else | |
1051 | ifx_dev->swap_buf = swap_buf_8; | |
1052 | ||
af3b8881 RG |
1053 | /* ensure SPI protocol flags are initialized to enable transfer */ |
1054 | ifx_dev->spi_more = 0; | |
1055 | ifx_dev->spi_slave_cts = 0; | |
1056 | ||
1057 | /*initialize transfer and dma buffers */ | |
5fc32495 | 1058 | ifx_dev->tx_buffer = dma_alloc_coherent(ifx_dev->spi_dev->dev.parent, |
af3b8881 RG |
1059 | IFX_SPI_TRANSFER_SIZE, |
1060 | &ifx_dev->tx_bus, | |
1061 | GFP_KERNEL); | |
1062 | if (!ifx_dev->tx_buffer) { | |
1063 | dev_err(&spi->dev, "DMA-TX buffer allocation failed"); | |
1064 | ret = -ENOMEM; | |
1065 | goto error_ret; | |
1066 | } | |
5fc32495 | 1067 | ifx_dev->rx_buffer = dma_alloc_coherent(ifx_dev->spi_dev->dev.parent, |
af3b8881 RG |
1068 | IFX_SPI_TRANSFER_SIZE, |
1069 | &ifx_dev->rx_bus, | |
1070 | GFP_KERNEL); | |
1071 | if (!ifx_dev->rx_buffer) { | |
1072 | dev_err(&spi->dev, "DMA-RX buffer allocation failed"); | |
1073 | ret = -ENOMEM; | |
1074 | goto error_ret; | |
1075 | } | |
1076 | ||
1077 | /* initialize waitq for modem reset */ | |
1078 | init_waitqueue_head(&ifx_dev->mdm_reset_wait); | |
1079 | ||
1080 | spi_set_drvdata(spi, ifx_dev); | |
1081 | tasklet_init(&ifx_dev->io_work_tasklet, ifx_spi_io, | |
1082 | (unsigned long)ifx_dev); | |
1083 | ||
1084 | set_bit(IFX_SPI_STATE_PRESENT, &ifx_dev->flags); | |
1085 | ||
1086 | /* create our tty port */ | |
1087 | ret = ifx_spi_create_port(ifx_dev); | |
1088 | if (ret != 0) { | |
1089 | dev_err(&spi->dev, "create default tty port failed"); | |
1090 | goto error_ret; | |
1091 | } | |
1092 | ||
2f1522ec RG |
1093 | ifx_dev->gpio.reset = pl_data->rst_pmu; |
1094 | ifx_dev->gpio.po = pl_data->pwr_on; | |
1095 | ifx_dev->gpio.mrdy = pl_data->mrdy; | |
1096 | ifx_dev->gpio.srdy = pl_data->srdy; | |
1097 | ifx_dev->gpio.reset_out = pl_data->rst_out; | |
af3b8881 RG |
1098 | |
1099 | dev_info(&spi->dev, "gpios %d, %d, %d, %d, %d", | |
1100 | ifx_dev->gpio.reset, ifx_dev->gpio.po, ifx_dev->gpio.mrdy, | |
1101 | ifx_dev->gpio.srdy, ifx_dev->gpio.reset_out); | |
1102 | ||
1103 | /* Configure gpios */ | |
1104 | ret = gpio_request(ifx_dev->gpio.reset, "ifxModem"); | |
1105 | if (ret < 0) { | |
1106 | dev_err(&spi->dev, "Unable to allocate GPIO%d (RESET)", | |
1107 | ifx_dev->gpio.reset); | |
1108 | goto error_ret; | |
1109 | } | |
1110 | ret += gpio_direction_output(ifx_dev->gpio.reset, 0); | |
1111 | ret += gpio_export(ifx_dev->gpio.reset, 1); | |
1112 | if (ret) { | |
1113 | dev_err(&spi->dev, "Unable to configure GPIO%d (RESET)", | |
1114 | ifx_dev->gpio.reset); | |
1115 | ret = -EBUSY; | |
1116 | goto error_ret2; | |
1117 | } | |
1118 | ||
1119 | ret = gpio_request(ifx_dev->gpio.po, "ifxModem"); | |
1120 | ret += gpio_direction_output(ifx_dev->gpio.po, 0); | |
1121 | ret += gpio_export(ifx_dev->gpio.po, 1); | |
1122 | if (ret) { | |
1123 | dev_err(&spi->dev, "Unable to configure GPIO%d (ON)", | |
1124 | ifx_dev->gpio.po); | |
1125 | ret = -EBUSY; | |
1126 | goto error_ret3; | |
1127 | } | |
1128 | ||
1129 | ret = gpio_request(ifx_dev->gpio.mrdy, "ifxModem"); | |
1130 | if (ret < 0) { | |
1131 | dev_err(&spi->dev, "Unable to allocate GPIO%d (MRDY)", | |
1132 | ifx_dev->gpio.mrdy); | |
1133 | goto error_ret3; | |
1134 | } | |
1135 | ret += gpio_export(ifx_dev->gpio.mrdy, 1); | |
1136 | ret += gpio_direction_output(ifx_dev->gpio.mrdy, 0); | |
1137 | if (ret) { | |
1138 | dev_err(&spi->dev, "Unable to configure GPIO%d (MRDY)", | |
1139 | ifx_dev->gpio.mrdy); | |
1140 | ret = -EBUSY; | |
1141 | goto error_ret4; | |
1142 | } | |
1143 | ||
1144 | ret = gpio_request(ifx_dev->gpio.srdy, "ifxModem"); | |
1145 | if (ret < 0) { | |
1146 | dev_err(&spi->dev, "Unable to allocate GPIO%d (SRDY)", | |
1147 | ifx_dev->gpio.srdy); | |
1148 | ret = -EBUSY; | |
1149 | goto error_ret4; | |
1150 | } | |
1151 | ret += gpio_export(ifx_dev->gpio.srdy, 1); | |
1152 | ret += gpio_direction_input(ifx_dev->gpio.srdy); | |
1153 | if (ret) { | |
1154 | dev_err(&spi->dev, "Unable to configure GPIO%d (SRDY)", | |
1155 | ifx_dev->gpio.srdy); | |
1156 | ret = -EBUSY; | |
1157 | goto error_ret5; | |
1158 | } | |
1159 | ||
1160 | ret = gpio_request(ifx_dev->gpio.reset_out, "ifxModem"); | |
1161 | if (ret < 0) { | |
1162 | dev_err(&spi->dev, "Unable to allocate GPIO%d (RESET_OUT)", | |
1163 | ifx_dev->gpio.reset_out); | |
1164 | goto error_ret5; | |
1165 | } | |
1166 | ret += gpio_export(ifx_dev->gpio.reset_out, 1); | |
1167 | ret += gpio_direction_input(ifx_dev->gpio.reset_out); | |
1168 | if (ret) { | |
1169 | dev_err(&spi->dev, "Unable to configure GPIO%d (RESET_OUT)", | |
1170 | ifx_dev->gpio.reset_out); | |
1171 | ret = -EBUSY; | |
1172 | goto error_ret6; | |
1173 | } | |
1174 | ||
1175 | ret = request_irq(gpio_to_irq(ifx_dev->gpio.reset_out), | |
1176 | ifx_spi_reset_interrupt, | |
1177 | IRQF_TRIGGER_RISING|IRQF_TRIGGER_FALLING, DRVNAME, | |
1178 | (void *)ifx_dev); | |
1179 | if (ret) { | |
1180 | dev_err(&spi->dev, "Unable to get irq %x\n", | |
1181 | gpio_to_irq(ifx_dev->gpio.reset_out)); | |
1182 | goto error_ret6; | |
1183 | } | |
1184 | ||
1185 | ret = ifx_spi_reset(ifx_dev); | |
1186 | ||
1187 | ret = request_irq(gpio_to_irq(ifx_dev->gpio.srdy), | |
1188 | ifx_spi_srdy_interrupt, | |
1189 | IRQF_TRIGGER_RISING, DRVNAME, | |
1190 | (void *)ifx_dev); | |
1191 | if (ret) { | |
1192 | dev_err(&spi->dev, "Unable to get irq %x", | |
1193 | gpio_to_irq(ifx_dev->gpio.srdy)); | |
badb9533 | 1194 | goto error_ret7; |
af3b8881 RG |
1195 | } |
1196 | ||
1197 | /* set pm runtime power state and register with power system */ | |
1198 | pm_runtime_set_active(&spi->dev); | |
1199 | pm_runtime_enable(&spi->dev); | |
1200 | ||
1201 | /* handle case that modem is already signaling SRDY */ | |
1202 | /* no outgoing tty open at this point, this just satisfies the | |
1203 | * modem's read and should reset communication properly | |
1204 | */ | |
1205 | srdy = gpio_get_value(ifx_dev->gpio.srdy); | |
1206 | ||
1207 | if (srdy) { | |
1208 | mrdy_assert(ifx_dev); | |
1209 | ifx_spi_handle_srdy(ifx_dev); | |
1210 | } else | |
1211 | mrdy_set_low(ifx_dev); | |
1212 | return 0; | |
1213 | ||
badb9533 VK |
1214 | error_ret7: |
1215 | free_irq(gpio_to_irq(ifx_dev->gpio.reset_out), (void *)ifx_dev); | |
af3b8881 RG |
1216 | error_ret6: |
1217 | gpio_free(ifx_dev->gpio.srdy); | |
1218 | error_ret5: | |
1219 | gpio_free(ifx_dev->gpio.mrdy); | |
1220 | error_ret4: | |
1221 | gpio_free(ifx_dev->gpio.reset); | |
1222 | error_ret3: | |
1223 | gpio_free(ifx_dev->gpio.po); | |
1224 | error_ret2: | |
1225 | gpio_free(ifx_dev->gpio.reset_out); | |
1226 | error_ret: | |
1227 | ifx_spi_free_device(ifx_dev); | |
1228 | saved_ifx_dev = NULL; | |
1229 | return ret; | |
1230 | } | |
1231 | ||
1232 | /** | |
1233 | * ifx_spi_spi_remove - SPI device was removed | |
1234 | * @spi: SPI device | |
1235 | * | |
1236 | * FIXME: We should be shutting the device down here not in | |
1237 | * the module unload path. | |
1238 | */ | |
1239 | ||
1240 | static int ifx_spi_spi_remove(struct spi_device *spi) | |
1241 | { | |
1242 | struct ifx_spi_device *ifx_dev = spi_get_drvdata(spi); | |
1243 | /* stop activity */ | |
1244 | tasklet_kill(&ifx_dev->io_work_tasklet); | |
1245 | /* free irq */ | |
1246 | free_irq(gpio_to_irq(ifx_dev->gpio.reset_out), (void *)ifx_dev); | |
1247 | free_irq(gpio_to_irq(ifx_dev->gpio.srdy), (void *)ifx_dev); | |
1248 | ||
1249 | gpio_free(ifx_dev->gpio.srdy); | |
1250 | gpio_free(ifx_dev->gpio.mrdy); | |
1251 | gpio_free(ifx_dev->gpio.reset); | |
1252 | gpio_free(ifx_dev->gpio.po); | |
1253 | gpio_free(ifx_dev->gpio.reset_out); | |
1254 | ||
1255 | /* free allocations */ | |
1256 | ifx_spi_free_device(ifx_dev); | |
1257 | ||
1258 | saved_ifx_dev = NULL; | |
1259 | return 0; | |
1260 | } | |
1261 | ||
1262 | /** | |
1263 | * ifx_spi_spi_shutdown - called on SPI shutdown | |
1264 | * @spi: SPI device | |
1265 | * | |
1266 | * No action needs to be taken here | |
1267 | */ | |
1268 | ||
1269 | static void ifx_spi_spi_shutdown(struct spi_device *spi) | |
1270 | { | |
72d4724e JC |
1271 | struct ifx_spi_device *ifx_dev = spi_get_drvdata(spi); |
1272 | ||
1273 | ifx_modem_power_off(ifx_dev); | |
af3b8881 RG |
1274 | } |
1275 | ||
1276 | /* | |
1277 | * various suspends and resumes have nothing to do | |
1278 | * no hardware to save state for | |
1279 | */ | |
1280 | ||
af3b8881 RG |
1281 | /** |
1282 | * ifx_spi_pm_suspend - suspend modem on system suspend | |
1283 | * @dev: device being suspended | |
1284 | * | |
1285 | * Suspend the modem. No action needed on Intel MID platforms, may | |
1286 | * need extending for other systems. | |
1287 | */ | |
1288 | static int ifx_spi_pm_suspend(struct device *dev) | |
1289 | { | |
1290 | return 0; | |
1291 | } | |
1292 | ||
1293 | /** | |
1294 | * ifx_spi_pm_resume - resume modem on system resume | |
1295 | * @dev: device being suspended | |
1296 | * | |
1297 | * Allow the modem to resume. No action needed. | |
1298 | * | |
1299 | * FIXME: do we need to reset anything here ? | |
1300 | */ | |
1301 | static int ifx_spi_pm_resume(struct device *dev) | |
1302 | { | |
1303 | return 0; | |
1304 | } | |
1305 | ||
1306 | /** | |
1307 | * ifx_spi_pm_runtime_resume - suspend modem | |
1308 | * @dev: device being suspended | |
1309 | * | |
1310 | * Allow the modem to resume. No action needed. | |
1311 | */ | |
1312 | static int ifx_spi_pm_runtime_resume(struct device *dev) | |
1313 | { | |
1314 | return 0; | |
1315 | } | |
1316 | ||
1317 | /** | |
1318 | * ifx_spi_pm_runtime_suspend - suspend modem | |
1319 | * @dev: device being suspended | |
1320 | * | |
1321 | * Allow the modem to suspend and thus suspend to continue up the | |
1322 | * device tree. | |
1323 | */ | |
1324 | static int ifx_spi_pm_runtime_suspend(struct device *dev) | |
1325 | { | |
1326 | return 0; | |
1327 | } | |
1328 | ||
1329 | /** | |
1330 | * ifx_spi_pm_runtime_idle - check if modem idle | |
1331 | * @dev: our device | |
1332 | * | |
1333 | * Check conditions and queue runtime suspend if idle. | |
1334 | */ | |
1335 | static int ifx_spi_pm_runtime_idle(struct device *dev) | |
1336 | { | |
1337 | struct spi_device *spi = to_spi_device(dev); | |
1338 | struct ifx_spi_device *ifx_dev = spi_get_drvdata(spi); | |
1339 | ||
1340 | if (!ifx_dev->power_status) | |
1341 | pm_runtime_suspend(dev); | |
1342 | ||
1343 | return 0; | |
1344 | } | |
1345 | ||
1346 | static const struct dev_pm_ops ifx_spi_pm = { | |
1347 | .resume = ifx_spi_pm_resume, | |
1348 | .suspend = ifx_spi_pm_suspend, | |
1349 | .runtime_resume = ifx_spi_pm_runtime_resume, | |
1350 | .runtime_suspend = ifx_spi_pm_runtime_suspend, | |
1351 | .runtime_idle = ifx_spi_pm_runtime_idle | |
1352 | }; | |
1353 | ||
1354 | static const struct spi_device_id ifx_id_table[] = { | |
1355 | {"ifx6160", 0}, | |
1356 | {"ifx6260", 0}, | |
1357 | { } | |
1358 | }; | |
1359 | MODULE_DEVICE_TABLE(spi, ifx_id_table); | |
1360 | ||
1361 | /* spi operations */ | |
7d9739cd | 1362 | static struct spi_driver ifx_spi_driver = { |
af3b8881 | 1363 | .driver = { |
8115be01 | 1364 | .name = DRVNAME, |
af3b8881 RG |
1365 | .pm = &ifx_spi_pm, |
1366 | .owner = THIS_MODULE}, | |
1367 | .probe = ifx_spi_spi_probe, | |
1368 | .shutdown = ifx_spi_spi_shutdown, | |
2d47b716 | 1369 | .remove = ifx_spi_spi_remove, |
af3b8881 RG |
1370 | .id_table = ifx_id_table |
1371 | }; | |
1372 | ||
1373 | /** | |
1374 | * ifx_spi_exit - module exit | |
1375 | * | |
1376 | * Unload the module. | |
1377 | */ | |
1378 | ||
1379 | static void __exit ifx_spi_exit(void) | |
1380 | { | |
1381 | /* unregister */ | |
1382 | tty_unregister_driver(tty_drv); | |
72d4724e | 1383 | put_tty_driver(tty_drv); |
8115be01 | 1384 | spi_unregister_driver((void *)&ifx_spi_driver); |
72d4724e | 1385 | unregister_reboot_notifier(&ifx_modem_reboot_notifier_block); |
af3b8881 RG |
1386 | } |
1387 | ||
1388 | /** | |
1389 | * ifx_spi_init - module entry point | |
1390 | * | |
1391 | * Initialise the SPI and tty interfaces for the IFX SPI driver | |
1392 | * We need to initialize upper-edge spi driver after the tty | |
1393 | * driver because otherwise the spi probe will race | |
1394 | */ | |
1395 | ||
1396 | static int __init ifx_spi_init(void) | |
1397 | { | |
1398 | int result; | |
1399 | ||
1400 | tty_drv = alloc_tty_driver(1); | |
1401 | if (!tty_drv) { | |
1402 | pr_err("%s: alloc_tty_driver failed", DRVNAME); | |
1403 | return -ENOMEM; | |
1404 | } | |
1405 | ||
af3b8881 RG |
1406 | tty_drv->driver_name = DRVNAME; |
1407 | tty_drv->name = TTYNAME; | |
1408 | tty_drv->minor_start = IFX_SPI_TTY_ID; | |
af3b8881 RG |
1409 | tty_drv->type = TTY_DRIVER_TYPE_SERIAL; |
1410 | tty_drv->subtype = SERIAL_TYPE_NORMAL; | |
1411 | tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; | |
1412 | tty_drv->init_termios = tty_std_termios; | |
1413 | ||
1414 | tty_set_operations(tty_drv, &ifx_spi_serial_ops); | |
1415 | ||
1416 | result = tty_register_driver(tty_drv); | |
1417 | if (result) { | |
1418 | pr_err("%s: tty_register_driver failed(%d)", | |
1419 | DRVNAME, result); | |
72d4724e | 1420 | goto err_free_tty; |
af3b8881 RG |
1421 | } |
1422 | ||
8115be01 | 1423 | result = spi_register_driver((void *)&ifx_spi_driver); |
af3b8881 RG |
1424 | if (result) { |
1425 | pr_err("%s: spi_register_driver failed(%d)", | |
1426 | DRVNAME, result); | |
72d4724e JC |
1427 | goto err_unreg_tty; |
1428 | } | |
1429 | ||
1430 | result = register_reboot_notifier(&ifx_modem_reboot_notifier_block); | |
1431 | if (result) { | |
1432 | pr_err("%s: register ifx modem reboot notifier failed(%d)", | |
1433 | DRVNAME, result); | |
1434 | goto err_unreg_spi; | |
af3b8881 | 1435 | } |
72d4724e JC |
1436 | |
1437 | return 0; | |
1438 | err_unreg_spi: | |
1439 | spi_unregister_driver((void *)&ifx_spi_driver); | |
1440 | err_unreg_tty: | |
1441 | tty_unregister_driver(tty_drv); | |
1442 | err_free_tty: | |
1443 | put_tty_driver(tty_drv); | |
1444 | ||
af3b8881 RG |
1445 | return result; |
1446 | } | |
1447 | ||
1448 | module_init(ifx_spi_init); | |
1449 | module_exit(ifx_spi_exit); | |
1450 | ||
1451 | MODULE_AUTHOR("Intel"); | |
1452 | MODULE_DESCRIPTION("IFX6x60 spi driver"); | |
1453 | MODULE_LICENSE("GPL"); | |
1454 | MODULE_INFO(Version, "0.1-IFX6x60"); |