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c974a9e5 JN |
1 | /* |
2 | * Simple synchronous serial port driver for ETRAX 100LX. | |
3 | * | |
4 | * Synchronous serial ports are used for continuous streamed data like audio. | |
5 | * The default setting for this driver is compatible with the STA 013 MP3 | |
6 | * decoder. The driver can easily be tuned to fit other audio encoder/decoders | |
7 | * and SPI | |
8 | * | |
9 | * Copyright (c) 2001-2008 Axis Communications AB | |
10 | * | |
11 | * Author: Mikael Starvik, Johan Adolfsson | |
12 | * | |
13 | */ | |
14 | #include <linux/module.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/errno.h> | |
18 | #include <linux/major.h> | |
19 | #include <linux/sched.h> | |
c974a9e5 JN |
20 | #include <linux/interrupt.h> |
21 | #include <linux/poll.h> | |
22 | #include <linux/init.h> | |
0c401df3 | 23 | #include <linux/smp_lock.h> |
c974a9e5 JN |
24 | #include <linux/timer.h> |
25 | #include <asm/irq.h> | |
26 | #include <asm/dma.h> | |
27 | #include <asm/io.h> | |
556dcee7 | 28 | #include <arch/svinto.h> |
c974a9e5 JN |
29 | #include <asm/uaccess.h> |
30 | #include <asm/system.h> | |
31 | #include <asm/sync_serial.h> | |
556dcee7 | 32 | #include <arch/io_interface_mux.h> |
c974a9e5 JN |
33 | |
34 | /* The receiver is a bit tricky beacuse of the continuous stream of data.*/ | |
35 | /* */ | |
36 | /* Three DMA descriptors are linked together. Each DMA descriptor is */ | |
37 | /* responsible for port->bufchunk of a common buffer. */ | |
38 | /* */ | |
39 | /* +---------------------------------------------+ */ | |
40 | /* | +----------+ +----------+ +----------+ | */ | |
41 | /* +-> | Descr[0] |-->| Descr[1] |-->| Descr[2] |-+ */ | |
42 | /* +----------+ +----------+ +----------+ */ | |
43 | /* | | | */ | |
44 | /* v v v */ | |
45 | /* +-------------------------------------+ */ | |
46 | /* | BUFFER | */ | |
47 | /* +-------------------------------------+ */ | |
48 | /* |<- data_avail ->| */ | |
49 | /* readp writep */ | |
50 | /* */ | |
51 | /* If the application keeps up the pace readp will be right after writep.*/ | |
52 | /* If the application can't keep the pace we have to throw away data. */ | |
53 | /* The idea is that readp should be ready with the data pointed out by */ | |
54 | /* Descr[i] when the DMA has filled in Descr[i+1]. */ | |
55 | /* Otherwise we will discard */ | |
56 | /* the rest of the data pointed out by Descr1 and set readp to the start */ | |
57 | /* of Descr2 */ | |
58 | ||
59 | #define SYNC_SERIAL_MAJOR 125 | |
60 | ||
61 | /* IN_BUFFER_SIZE should be a multiple of 6 to make sure that 24 bit */ | |
62 | /* words can be handled */ | |
63 | #define IN_BUFFER_SIZE 12288 | |
64 | #define IN_DESCR_SIZE 256 | |
65 | #define NUM_IN_DESCR (IN_BUFFER_SIZE/IN_DESCR_SIZE) | |
66 | #define OUT_BUFFER_SIZE 4096 | |
67 | ||
68 | #define DEFAULT_FRAME_RATE 0 | |
69 | #define DEFAULT_WORD_RATE 7 | |
70 | ||
71 | /* NOTE: Enabling some debug will likely cause overrun or underrun, | |
72 | * especially if manual mode is use. | |
73 | */ | |
74 | #define DEBUG(x) | |
75 | #define DEBUGREAD(x) | |
76 | #define DEBUGWRITE(x) | |
77 | #define DEBUGPOLL(x) | |
78 | #define DEBUGRXINT(x) | |
79 | #define DEBUGTXINT(x) | |
80 | ||
81 | /* Define some macros to access ETRAX 100 registers */ | |
82 | #define SETF(var, reg, field, val) \ | |
83 | do { \ | |
84 | var = (var & ~IO_MASK_(reg##_, field##_)) | \ | |
85 | IO_FIELD_(reg##_, field##_, val); \ | |
86 | } while (0) | |
87 | ||
88 | #define SETS(var, reg, field, val) \ | |
89 | do { \ | |
90 | var = (var & ~IO_MASK_(reg##_, field##_)) | \ | |
91 | IO_STATE_(reg##_, field##_, _##val); \ | |
92 | } while (0) | |
93 | ||
94 | struct sync_port { | |
95 | /* Etrax registers and bits*/ | |
96 | const volatile unsigned *const status; | |
97 | volatile unsigned *const ctrl_data; | |
98 | volatile unsigned *const output_dma_first; | |
99 | volatile unsigned char *const output_dma_cmd; | |
100 | volatile unsigned char *const output_dma_clr_irq; | |
101 | volatile unsigned *const input_dma_first; | |
102 | volatile unsigned char *const input_dma_cmd; | |
103 | volatile unsigned *const input_dma_descr; | |
104 | /* 8*4 */ | |
105 | volatile unsigned char *const input_dma_clr_irq; | |
106 | volatile unsigned *const data_out; | |
107 | const volatile unsigned *const data_in; | |
108 | char data_avail_bit; /* In R_IRQ_MASK1_RD/SET/CLR */ | |
109 | char transmitter_ready_bit; /* In R_IRQ_MASK1_RD/SET/CLR */ | |
110 | char input_dma_descr_bit; /* In R_IRQ_MASK2_RD */ | |
111 | ||
112 | char output_dma_bit; /* In R_IRQ_MASK2_RD */ | |
113 | /* End of fields initialised in array */ | |
114 | char started; /* 1 if port has been started */ | |
115 | char port_nbr; /* Port 0 or 1 */ | |
116 | char busy; /* 1 if port is busy */ | |
117 | ||
118 | char enabled; /* 1 if port is enabled */ | |
119 | char use_dma; /* 1 if port uses dma */ | |
120 | char tr_running; | |
121 | ||
122 | char init_irqs; | |
123 | ||
124 | /* Register shadow */ | |
125 | unsigned int ctrl_data_shadow; | |
126 | /* Remaining bytes for current transfer */ | |
127 | volatile unsigned int out_count; | |
128 | /* Current position in out_buffer */ | |
129 | unsigned char *outp; | |
130 | /* 16*4 */ | |
131 | /* Next byte to be read by application */ | |
132 | volatile unsigned char *volatile readp; | |
133 | /* Next byte to be written by etrax */ | |
134 | volatile unsigned char *volatile writep; | |
135 | ||
136 | unsigned int in_buffer_size; | |
137 | unsigned int inbufchunk; | |
138 | struct etrax_dma_descr out_descr __attribute__ ((aligned(32))); | |
139 | struct etrax_dma_descr in_descr[NUM_IN_DESCR] __attribute__ ((aligned(32))); | |
140 | unsigned char out_buffer[OUT_BUFFER_SIZE] __attribute__ ((aligned(32))); | |
141 | unsigned char in_buffer[IN_BUFFER_SIZE]__attribute__ ((aligned(32))); | |
142 | unsigned char flip[IN_BUFFER_SIZE] __attribute__ ((aligned(32))); | |
143 | struct etrax_dma_descr *next_rx_desc; | |
144 | struct etrax_dma_descr *prev_rx_desc; | |
145 | int full; | |
146 | ||
147 | wait_queue_head_t out_wait_q; | |
148 | wait_queue_head_t in_wait_q; | |
149 | }; | |
150 | ||
151 | ||
152 | static int etrax_sync_serial_init(void); | |
153 | static void initialize_port(int portnbr); | |
154 | static inline int sync_data_avail(struct sync_port *port); | |
155 | ||
156 | static int sync_serial_open(struct inode *inode, struct file *file); | |
157 | static int sync_serial_release(struct inode *inode, struct file *file); | |
158 | static unsigned int sync_serial_poll(struct file *filp, poll_table *wait); | |
159 | ||
90276a1a | 160 | static int sync_serial_ioctl(struct file *file, |
c974a9e5 JN |
161 | unsigned int cmd, unsigned long arg); |
162 | static ssize_t sync_serial_write(struct file *file, const char *buf, | |
163 | size_t count, loff_t *ppos); | |
164 | static ssize_t sync_serial_read(struct file *file, char *buf, | |
165 | size_t count, loff_t *ppos); | |
166 | ||
167 | #if ((defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \ | |
168 | defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)) || \ | |
169 | (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) && \ | |
170 | defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA))) | |
171 | #define SYNC_SER_DMA | |
172 | #endif | |
173 | ||
174 | static void send_word(struct sync_port *port); | |
175 | static void start_dma(struct sync_port *port, const char *data, int count); | |
176 | static void start_dma_in(struct sync_port *port); | |
177 | #ifdef SYNC_SER_DMA | |
178 | static irqreturn_t tr_interrupt(int irq, void *dev_id); | |
179 | static irqreturn_t rx_interrupt(int irq, void *dev_id); | |
180 | #endif | |
181 | #if ((defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \ | |
182 | !defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)) || \ | |
183 | (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) && \ | |
184 | !defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA))) | |
185 | #define SYNC_SER_MANUAL | |
186 | #endif | |
187 | #ifdef SYNC_SER_MANUAL | |
188 | static irqreturn_t manual_interrupt(int irq, void *dev_id); | |
189 | #endif | |
190 | ||
191 | /* The ports */ | |
192 | static struct sync_port ports[] = { | |
193 | { | |
194 | .status = R_SYNC_SERIAL1_STATUS, | |
195 | .ctrl_data = R_SYNC_SERIAL1_CTRL, | |
196 | .output_dma_first = R_DMA_CH8_FIRST, | |
197 | .output_dma_cmd = R_DMA_CH8_CMD, | |
198 | .output_dma_clr_irq = R_DMA_CH8_CLR_INTR, | |
199 | .input_dma_first = R_DMA_CH9_FIRST, | |
200 | .input_dma_cmd = R_DMA_CH9_CMD, | |
201 | .input_dma_descr = R_DMA_CH9_DESCR, | |
202 | .input_dma_clr_irq = R_DMA_CH9_CLR_INTR, | |
203 | .data_out = R_SYNC_SERIAL1_TR_DATA, | |
204 | .data_in = R_SYNC_SERIAL1_REC_DATA, | |
205 | .data_avail_bit = IO_BITNR(R_IRQ_MASK1_RD, ser1_data), | |
206 | .transmitter_ready_bit = IO_BITNR(R_IRQ_MASK1_RD, ser1_ready), | |
207 | .input_dma_descr_bit = IO_BITNR(R_IRQ_MASK2_RD, dma9_descr), | |
208 | .output_dma_bit = IO_BITNR(R_IRQ_MASK2_RD, dma8_eop), | |
209 | .init_irqs = 1, | |
210 | #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA) | |
211 | .use_dma = 1, | |
212 | #else | |
213 | .use_dma = 0, | |
214 | #endif | |
215 | }, | |
216 | { | |
217 | .status = R_SYNC_SERIAL3_STATUS, | |
218 | .ctrl_data = R_SYNC_SERIAL3_CTRL, | |
219 | .output_dma_first = R_DMA_CH4_FIRST, | |
220 | .output_dma_cmd = R_DMA_CH4_CMD, | |
221 | .output_dma_clr_irq = R_DMA_CH4_CLR_INTR, | |
222 | .input_dma_first = R_DMA_CH5_FIRST, | |
223 | .input_dma_cmd = R_DMA_CH5_CMD, | |
224 | .input_dma_descr = R_DMA_CH5_DESCR, | |
225 | .input_dma_clr_irq = R_DMA_CH5_CLR_INTR, | |
226 | .data_out = R_SYNC_SERIAL3_TR_DATA, | |
227 | .data_in = R_SYNC_SERIAL3_REC_DATA, | |
228 | .data_avail_bit = IO_BITNR(R_IRQ_MASK1_RD, ser3_data), | |
229 | .transmitter_ready_bit = IO_BITNR(R_IRQ_MASK1_RD, ser3_ready), | |
230 | .input_dma_descr_bit = IO_BITNR(R_IRQ_MASK2_RD, dma5_descr), | |
231 | .output_dma_bit = IO_BITNR(R_IRQ_MASK2_RD, dma4_eop), | |
232 | .init_irqs = 1, | |
233 | #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA) | |
234 | .use_dma = 1, | |
235 | #else | |
236 | .use_dma = 0, | |
237 | #endif | |
238 | } | |
239 | }; | |
240 | ||
241 | /* Register shadows */ | |
242 | static unsigned sync_serial_prescale_shadow; | |
243 | ||
244 | #define NUMBER_OF_PORTS 2 | |
245 | ||
828c0950 | 246 | static const struct file_operations sync_serial_fops = { |
90276a1a JN |
247 | .owner = THIS_MODULE, |
248 | .write = sync_serial_write, | |
249 | .read = sync_serial_read, | |
250 | .poll = sync_serial_poll, | |
251 | .unlocked_ioctl = sync_serial_ioctl, | |
252 | .open = sync_serial_open, | |
253 | .release = sync_serial_release | |
c974a9e5 JN |
254 | }; |
255 | ||
256 | static int __init etrax_sync_serial_init(void) | |
257 | { | |
258 | ports[0].enabled = 0; | |
259 | ports[1].enabled = 0; | |
260 | ||
261 | #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) | |
262 | if (cris_request_io_interface(if_sync_serial_1, "sync_ser1")) { | |
263 | printk(KERN_CRIT "ETRAX100LX sync_serial: " | |
264 | "Could not allocate IO group for port %d\n", 0); | |
265 | return -EBUSY; | |
266 | } | |
267 | #endif | |
268 | #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) | |
269 | if (cris_request_io_interface(if_sync_serial_3, "sync_ser3")) { | |
270 | #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) | |
271 | cris_free_io_interface(if_sync_serial_1); | |
272 | #endif | |
273 | printk(KERN_CRIT "ETRAX100LX sync_serial: " | |
274 | "Could not allocate IO group for port %d\n", 1); | |
275 | return -EBUSY; | |
276 | } | |
277 | #endif | |
278 | ||
279 | if (register_chrdev(SYNC_SERIAL_MAJOR, "sync serial", | |
280 | &sync_serial_fops) < 0) { | |
281 | #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) | |
282 | cris_free_io_interface(if_sync_serial_3); | |
283 | #endif | |
284 | #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) | |
285 | cris_free_io_interface(if_sync_serial_1); | |
286 | #endif | |
287 | printk("unable to get major for synchronous serial port\n"); | |
288 | return -EBUSY; | |
289 | } | |
290 | ||
291 | /* Deselect synchronous serial ports while configuring. */ | |
292 | SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode1, async); | |
293 | SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode3, async); | |
294 | *R_GEN_CONFIG_II = gen_config_ii_shadow; | |
295 | ||
296 | /* Initialize Ports */ | |
297 | #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) | |
298 | ports[0].enabled = 1; | |
299 | SETS(port_pb_i2c_shadow, R_PORT_PB_I2C, syncser1, ss1extra); | |
300 | SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode1, sync); | |
301 | #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA) | |
302 | ports[0].use_dma = 1; | |
303 | #else | |
304 | ports[0].use_dma = 0; | |
305 | #endif | |
306 | initialize_port(0); | |
307 | #endif | |
308 | ||
309 | #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) | |
310 | ports[1].enabled = 1; | |
311 | SETS(port_pb_i2c_shadow, R_PORT_PB_I2C, syncser3, ss3extra); | |
312 | SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode3, sync); | |
313 | #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA) | |
314 | ports[1].use_dma = 1; | |
315 | #else | |
316 | ports[1].use_dma = 0; | |
317 | #endif | |
318 | initialize_port(1); | |
319 | #endif | |
320 | ||
321 | *R_PORT_PB_I2C = port_pb_i2c_shadow; /* Use PB4/PB7 */ | |
322 | ||
323 | /* Set up timing */ | |
324 | *R_SYNC_SERIAL_PRESCALE = sync_serial_prescale_shadow = ( | |
325 | IO_STATE(R_SYNC_SERIAL_PRESCALE, clk_sel_u1, codec) | | |
326 | IO_STATE(R_SYNC_SERIAL_PRESCALE, word_stb_sel_u1, external) | | |
327 | IO_STATE(R_SYNC_SERIAL_PRESCALE, clk_sel_u3, codec) | | |
328 | IO_STATE(R_SYNC_SERIAL_PRESCALE, word_stb_sel_u3, external) | | |
329 | IO_STATE(R_SYNC_SERIAL_PRESCALE, prescaler, div4) | | |
330 | IO_FIELD(R_SYNC_SERIAL_PRESCALE, frame_rate, | |
331 | DEFAULT_FRAME_RATE) | | |
332 | IO_FIELD(R_SYNC_SERIAL_PRESCALE, word_rate, DEFAULT_WORD_RATE) | | |
333 | IO_STATE(R_SYNC_SERIAL_PRESCALE, warp_mode, normal)); | |
334 | ||
335 | /* Select synchronous ports */ | |
336 | *R_GEN_CONFIG_II = gen_config_ii_shadow; | |
337 | ||
338 | printk(KERN_INFO "ETRAX 100LX synchronous serial port driver\n"); | |
339 | return 0; | |
340 | } | |
341 | ||
342 | static void __init initialize_port(int portnbr) | |
343 | { | |
344 | struct sync_port *port = &ports[portnbr]; | |
345 | ||
346 | DEBUG(printk(KERN_DEBUG "Init sync serial port %d\n", portnbr)); | |
347 | ||
348 | port->started = 0; | |
349 | port->port_nbr = portnbr; | |
350 | port->busy = 0; | |
351 | port->tr_running = 0; | |
352 | ||
353 | port->out_count = 0; | |
354 | port->outp = port->out_buffer; | |
355 | ||
356 | port->readp = port->flip; | |
357 | port->writep = port->flip; | |
358 | port->in_buffer_size = IN_BUFFER_SIZE; | |
359 | port->inbufchunk = IN_DESCR_SIZE; | |
360 | port->next_rx_desc = &port->in_descr[0]; | |
361 | port->prev_rx_desc = &port->in_descr[NUM_IN_DESCR-1]; | |
362 | port->prev_rx_desc->ctrl = d_eol; | |
363 | ||
364 | init_waitqueue_head(&port->out_wait_q); | |
365 | init_waitqueue_head(&port->in_wait_q); | |
366 | ||
367 | port->ctrl_data_shadow = | |
368 | IO_STATE(R_SYNC_SERIAL1_CTRL, tr_baud, c115k2Hz) | | |
369 | IO_STATE(R_SYNC_SERIAL1_CTRL, mode, master_output) | | |
370 | IO_STATE(R_SYNC_SERIAL1_CTRL, error, ignore) | | |
371 | IO_STATE(R_SYNC_SERIAL1_CTRL, rec_enable, disable) | | |
372 | IO_STATE(R_SYNC_SERIAL1_CTRL, f_synctype, normal) | | |
373 | IO_STATE(R_SYNC_SERIAL1_CTRL, f_syncsize, word) | | |
374 | IO_STATE(R_SYNC_SERIAL1_CTRL, f_sync, on) | | |
375 | IO_STATE(R_SYNC_SERIAL1_CTRL, clk_mode, normal) | | |
376 | IO_STATE(R_SYNC_SERIAL1_CTRL, clk_halt, stopped) | | |
377 | IO_STATE(R_SYNC_SERIAL1_CTRL, bitorder, msb) | | |
378 | IO_STATE(R_SYNC_SERIAL1_CTRL, tr_enable, disable) | | |
379 | IO_STATE(R_SYNC_SERIAL1_CTRL, wordsize, size8bit) | | |
380 | IO_STATE(R_SYNC_SERIAL1_CTRL, buf_empty, lmt_8) | | |
381 | IO_STATE(R_SYNC_SERIAL1_CTRL, buf_full, lmt_8) | | |
382 | IO_STATE(R_SYNC_SERIAL1_CTRL, flow_ctrl, enabled) | | |
383 | IO_STATE(R_SYNC_SERIAL1_CTRL, clk_polarity, neg) | | |
384 | IO_STATE(R_SYNC_SERIAL1_CTRL, frame_polarity, normal)| | |
385 | IO_STATE(R_SYNC_SERIAL1_CTRL, status_polarity, inverted)| | |
386 | IO_STATE(R_SYNC_SERIAL1_CTRL, clk_driver, normal) | | |
387 | IO_STATE(R_SYNC_SERIAL1_CTRL, frame_driver, normal) | | |
388 | IO_STATE(R_SYNC_SERIAL1_CTRL, status_driver, normal)| | |
389 | IO_STATE(R_SYNC_SERIAL1_CTRL, def_out0, high); | |
390 | ||
391 | if (port->use_dma) | |
392 | port->ctrl_data_shadow |= IO_STATE(R_SYNC_SERIAL1_CTRL, | |
393 | dma_enable, on); | |
394 | else | |
395 | port->ctrl_data_shadow |= IO_STATE(R_SYNC_SERIAL1_CTRL, | |
396 | dma_enable, off); | |
397 | ||
398 | *port->ctrl_data = port->ctrl_data_shadow; | |
399 | } | |
400 | ||
401 | static inline int sync_data_avail(struct sync_port *port) | |
402 | { | |
403 | int avail; | |
404 | unsigned char *start; | |
405 | unsigned char *end; | |
406 | ||
407 | start = (unsigned char *)port->readp; /* cast away volatile */ | |
408 | end = (unsigned char *)port->writep; /* cast away volatile */ | |
409 | /* 0123456789 0123456789 | |
410 | * ----- - ----- | |
411 | * ^rp ^wp ^wp ^rp | |
412 | */ | |
413 | if (end >= start) | |
414 | avail = end - start; | |
415 | else | |
416 | avail = port->in_buffer_size - (start - end); | |
417 | return avail; | |
418 | } | |
419 | ||
420 | static inline int sync_data_avail_to_end(struct sync_port *port) | |
421 | { | |
422 | int avail; | |
423 | unsigned char *start; | |
424 | unsigned char *end; | |
425 | ||
426 | start = (unsigned char *)port->readp; /* cast away volatile */ | |
427 | end = (unsigned char *)port->writep; /* cast away volatile */ | |
428 | /* 0123456789 0123456789 | |
429 | * ----- ----- | |
430 | * ^rp ^wp ^wp ^rp | |
431 | */ | |
432 | ||
433 | if (end >= start) | |
434 | avail = end - start; | |
435 | else | |
436 | avail = port->flip + port->in_buffer_size - start; | |
437 | return avail; | |
438 | } | |
439 | ||
440 | ||
441 | static int sync_serial_open(struct inode *inode, struct file *file) | |
442 | { | |
443 | int dev = MINOR(inode->i_rdev); | |
444 | struct sync_port *port; | |
445 | int mode; | |
0c401df3 | 446 | int err = -EBUSY; |
c974a9e5 | 447 | |
0c401df3 | 448 | lock_kernel(); |
c974a9e5 JN |
449 | DEBUG(printk(KERN_DEBUG "Open sync serial port %d\n", dev)); |
450 | ||
451 | if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled) { | |
452 | DEBUG(printk(KERN_DEBUG "Invalid minor %d\n", dev)); | |
0c401df3 JC |
453 | err = -ENODEV; |
454 | goto out; | |
c974a9e5 JN |
455 | } |
456 | port = &ports[dev]; | |
457 | /* Allow open this device twice (assuming one reader and one writer) */ | |
458 | if (port->busy == 2) { | |
459 | DEBUG(printk(KERN_DEBUG "Device is busy.. \n")); | |
0c401df3 | 460 | goto out; |
c974a9e5 JN |
461 | } |
462 | if (port->init_irqs) { | |
463 | if (port->use_dma) { | |
464 | if (port == &ports[0]) { | |
465 | #ifdef SYNC_SER_DMA | |
466 | if (request_irq(24, tr_interrupt, 0, | |
467 | "synchronous serial 1 dma tr", | |
468 | &ports[0])) { | |
469 | printk(KERN_CRIT "Can't alloc " | |
470 | "sync serial port 1 IRQ"); | |
0c401df3 | 471 | goto out; |
c974a9e5 JN |
472 | } else if (request_irq(25, rx_interrupt, 0, |
473 | "synchronous serial 1 dma rx", | |
474 | &ports[0])) { | |
475 | free_irq(24, &port[0]); | |
476 | printk(KERN_CRIT "Can't alloc " | |
477 | "sync serial port 1 IRQ"); | |
0c401df3 | 478 | goto out; |
c974a9e5 JN |
479 | } else if (cris_request_dma(8, |
480 | "synchronous serial 1 dma tr", | |
481 | DMA_VERBOSE_ON_ERROR, | |
482 | dma_ser1)) { | |
483 | free_irq(24, &port[0]); | |
484 | free_irq(25, &port[0]); | |
485 | printk(KERN_CRIT "Can't alloc " | |
486 | "sync serial port 1 " | |
487 | "TX DMA channel"); | |
0c401df3 | 488 | goto out; |
c974a9e5 JN |
489 | } else if (cris_request_dma(9, |
490 | "synchronous serial 1 dma rec", | |
491 | DMA_VERBOSE_ON_ERROR, | |
492 | dma_ser1)) { | |
493 | cris_free_dma(8, NULL); | |
494 | free_irq(24, &port[0]); | |
495 | free_irq(25, &port[0]); | |
496 | printk(KERN_CRIT "Can't alloc " | |
497 | "sync serial port 1 " | |
498 | "RX DMA channel"); | |
0c401df3 | 499 | goto out; |
c974a9e5 JN |
500 | } |
501 | #endif | |
502 | RESET_DMA(8); WAIT_DMA(8); | |
503 | RESET_DMA(9); WAIT_DMA(9); | |
504 | *R_DMA_CH8_CLR_INTR = | |
505 | IO_STATE(R_DMA_CH8_CLR_INTR, clr_eop, | |
506 | do) | | |
507 | IO_STATE(R_DMA_CH8_CLR_INTR, clr_descr, | |
508 | do); | |
509 | *R_DMA_CH9_CLR_INTR = | |
510 | IO_STATE(R_DMA_CH9_CLR_INTR, clr_eop, | |
511 | do) | | |
512 | IO_STATE(R_DMA_CH9_CLR_INTR, clr_descr, | |
513 | do); | |
514 | *R_IRQ_MASK2_SET = | |
515 | IO_STATE(R_IRQ_MASK2_SET, dma8_eop, | |
516 | set) | | |
517 | IO_STATE(R_IRQ_MASK2_SET, dma9_descr, | |
518 | set); | |
519 | } else if (port == &ports[1]) { | |
520 | #ifdef SYNC_SER_DMA | |
521 | if (request_irq(20, tr_interrupt, 0, | |
522 | "synchronous serial 3 dma tr", | |
523 | &ports[1])) { | |
524 | printk(KERN_CRIT "Can't alloc " | |
525 | "sync serial port 3 IRQ"); | |
0c401df3 | 526 | goto out; |
c974a9e5 JN |
527 | } else if (request_irq(21, rx_interrupt, 0, |
528 | "synchronous serial 3 dma rx", | |
529 | &ports[1])) { | |
530 | free_irq(20, &ports[1]); | |
531 | printk(KERN_CRIT "Can't alloc " | |
532 | "sync serial port 3 IRQ"); | |
0c401df3 | 533 | goto out; |
c974a9e5 JN |
534 | } else if (cris_request_dma(4, |
535 | "synchronous serial 3 dma tr", | |
536 | DMA_VERBOSE_ON_ERROR, | |
537 | dma_ser3)) { | |
538 | free_irq(21, &ports[1]); | |
539 | free_irq(20, &ports[1]); | |
540 | printk(KERN_CRIT "Can't alloc " | |
541 | "sync serial port 3 " | |
542 | "TX DMA channel"); | |
0c401df3 | 543 | goto out; |
c974a9e5 JN |
544 | } else if (cris_request_dma(5, |
545 | "synchronous serial 3 dma rec", | |
546 | DMA_VERBOSE_ON_ERROR, | |
547 | dma_ser3)) { | |
548 | cris_free_dma(4, NULL); | |
549 | free_irq(21, &ports[1]); | |
550 | free_irq(20, &ports[1]); | |
551 | printk(KERN_CRIT "Can't alloc " | |
552 | "sync serial port 3 " | |
553 | "RX DMA channel"); | |
0c401df3 | 554 | goto out; |
c974a9e5 JN |
555 | } |
556 | #endif | |
557 | RESET_DMA(4); WAIT_DMA(4); | |
558 | RESET_DMA(5); WAIT_DMA(5); | |
559 | *R_DMA_CH4_CLR_INTR = | |
560 | IO_STATE(R_DMA_CH4_CLR_INTR, clr_eop, | |
561 | do) | | |
562 | IO_STATE(R_DMA_CH4_CLR_INTR, clr_descr, | |
563 | do); | |
564 | *R_DMA_CH5_CLR_INTR = | |
565 | IO_STATE(R_DMA_CH5_CLR_INTR, clr_eop, | |
566 | do) | | |
567 | IO_STATE(R_DMA_CH5_CLR_INTR, clr_descr, | |
568 | do); | |
569 | *R_IRQ_MASK2_SET = | |
570 | IO_STATE(R_IRQ_MASK2_SET, dma4_eop, | |
571 | set) | | |
572 | IO_STATE(R_IRQ_MASK2_SET, dma5_descr, | |
573 | set); | |
574 | } | |
575 | start_dma_in(port); | |
576 | port->init_irqs = 0; | |
577 | } else { /* !port->use_dma */ | |
578 | #ifdef SYNC_SER_MANUAL | |
579 | if (port == &ports[0]) { | |
580 | if (request_irq(8, | |
581 | manual_interrupt, | |
582 | IRQF_SHARED | IRQF_DISABLED, | |
583 | "synchronous serial manual irq", | |
584 | &ports[0])) { | |
585 | printk(KERN_CRIT "Can't alloc " | |
586 | "sync serial manual irq"); | |
0c401df3 | 587 | goto out; |
c974a9e5 JN |
588 | } |
589 | } else if (port == &ports[1]) { | |
590 | if (request_irq(8, | |
591 | manual_interrupt, | |
592 | IRQF_SHARED | IRQF_DISABLED, | |
593 | "synchronous serial manual irq", | |
594 | &ports[1])) { | |
595 | printk(KERN_CRIT "Can't alloc " | |
596 | "sync serial manual irq"); | |
0c401df3 | 597 | goto out; |
c974a9e5 JN |
598 | } |
599 | } | |
600 | port->init_irqs = 0; | |
601 | #else | |
602 | panic("sync_serial: Manual mode not supported.\n"); | |
603 | #endif /* SYNC_SER_MANUAL */ | |
604 | } | |
605 | } /* port->init_irqs */ | |
606 | ||
607 | port->busy++; | |
608 | /* Start port if we use it as input */ | |
609 | mode = IO_EXTRACT(R_SYNC_SERIAL1_CTRL, mode, port->ctrl_data_shadow); | |
610 | if (mode == IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, mode, master_input) || | |
611 | mode == IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, mode, slave_input) || | |
612 | mode == IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, mode, master_bidir) || | |
613 | mode == IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, mode, slave_bidir)) { | |
614 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, clk_halt, | |
615 | running); | |
616 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, tr_enable, | |
617 | enable); | |
618 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, rec_enable, | |
619 | enable); | |
620 | port->started = 1; | |
621 | *port->ctrl_data = port->ctrl_data_shadow; | |
622 | if (!port->use_dma) | |
623 | *R_IRQ_MASK1_SET = 1 << port->data_avail_bit; | |
624 | DEBUG(printk(KERN_DEBUG "sser%d rec started\n", dev)); | |
625 | } | |
0c401df3 JC |
626 | ret = 0; |
627 | ||
628 | out: | |
629 | unlock_kernel(); | |
630 | return ret; | |
c974a9e5 JN |
631 | } |
632 | ||
633 | static int sync_serial_release(struct inode *inode, struct file *file) | |
634 | { | |
635 | int dev = MINOR(inode->i_rdev); | |
636 | struct sync_port *port; | |
637 | ||
638 | if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled) { | |
639 | DEBUG(printk(KERN_DEBUG "Invalid minor %d\n", dev)); | |
640 | return -ENODEV; | |
641 | } | |
642 | port = &ports[dev]; | |
643 | if (port->busy) | |
644 | port->busy--; | |
645 | if (!port->busy) | |
646 | *R_IRQ_MASK1_CLR = ((1 << port->data_avail_bit) | | |
647 | (1 << port->transmitter_ready_bit)); | |
648 | ||
649 | return 0; | |
650 | } | |
651 | ||
652 | ||
653 | ||
654 | static unsigned int sync_serial_poll(struct file *file, poll_table *wait) | |
655 | { | |
656 | int dev = MINOR(file->f_dentry->d_inode->i_rdev); | |
657 | unsigned int mask = 0; | |
658 | struct sync_port *port; | |
659 | DEBUGPOLL(static unsigned int prev_mask = 0); | |
660 | ||
661 | port = &ports[dev]; | |
662 | poll_wait(file, &port->out_wait_q, wait); | |
663 | poll_wait(file, &port->in_wait_q, wait); | |
664 | /* Some room to write */ | |
665 | if (port->out_count < OUT_BUFFER_SIZE) | |
666 | mask |= POLLOUT | POLLWRNORM; | |
667 | /* At least an inbufchunk of data */ | |
668 | if (sync_data_avail(port) >= port->inbufchunk) | |
669 | mask |= POLLIN | POLLRDNORM; | |
670 | ||
671 | DEBUGPOLL(if (mask != prev_mask) | |
672 | printk(KERN_DEBUG "sync_serial_poll: mask 0x%08X %s %s\n", | |
673 | mask, | |
674 | mask & POLLOUT ? "POLLOUT" : "", | |
675 | mask & POLLIN ? "POLLIN" : ""); | |
676 | prev_mask = mask; | |
677 | ); | |
678 | return mask; | |
679 | } | |
680 | ||
90276a1a | 681 | static int sync_serial_ioctl_unlocked(struct file *file, |
c974a9e5 JN |
682 | unsigned int cmd, unsigned long arg) |
683 | { | |
684 | int return_val = 0; | |
685 | unsigned long flags; | |
686 | ||
687 | int dev = MINOR(file->f_dentry->d_inode->i_rdev); | |
688 | struct sync_port *port; | |
689 | ||
690 | if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled) { | |
691 | DEBUG(printk(KERN_DEBUG "Invalid minor %d\n", dev)); | |
692 | return -1; | |
693 | } | |
694 | port = &ports[dev]; | |
695 | ||
696 | local_irq_save(flags); | |
697 | /* Disable port while changing config */ | |
698 | if (dev) { | |
699 | if (port->use_dma) { | |
700 | RESET_DMA(4); WAIT_DMA(4); | |
701 | port->tr_running = 0; | |
702 | port->out_count = 0; | |
703 | port->outp = port->out_buffer; | |
704 | *R_DMA_CH4_CLR_INTR = | |
705 | IO_STATE(R_DMA_CH4_CLR_INTR, clr_eop, do) | | |
706 | IO_STATE(R_DMA_CH4_CLR_INTR, clr_descr, do); | |
707 | } | |
708 | SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode3, async); | |
709 | } else { | |
710 | if (port->use_dma) { | |
711 | RESET_DMA(8); WAIT_DMA(8); | |
712 | port->tr_running = 0; | |
713 | port->out_count = 0; | |
714 | port->outp = port->out_buffer; | |
715 | *R_DMA_CH8_CLR_INTR = | |
716 | IO_STATE(R_DMA_CH8_CLR_INTR, clr_eop, do) | | |
717 | IO_STATE(R_DMA_CH8_CLR_INTR, clr_descr, do); | |
718 | } | |
719 | SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode1, async); | |
720 | } | |
721 | *R_GEN_CONFIG_II = gen_config_ii_shadow; | |
722 | local_irq_restore(flags); | |
723 | ||
724 | switch (cmd) { | |
725 | case SSP_SPEED: | |
726 | if (GET_SPEED(arg) == CODEC) { | |
727 | if (dev) | |
728 | SETS(sync_serial_prescale_shadow, | |
729 | R_SYNC_SERIAL_PRESCALE, clk_sel_u3, | |
730 | codec); | |
731 | else | |
732 | SETS(sync_serial_prescale_shadow, | |
733 | R_SYNC_SERIAL_PRESCALE, clk_sel_u1, | |
734 | codec); | |
735 | ||
736 | SETF(sync_serial_prescale_shadow, | |
737 | R_SYNC_SERIAL_PRESCALE, prescaler, | |
738 | GET_FREQ(arg)); | |
739 | SETF(sync_serial_prescale_shadow, | |
740 | R_SYNC_SERIAL_PRESCALE, frame_rate, | |
741 | GET_FRAME_RATE(arg)); | |
742 | SETF(sync_serial_prescale_shadow, | |
743 | R_SYNC_SERIAL_PRESCALE, word_rate, | |
744 | GET_WORD_RATE(arg)); | |
745 | } else { | |
746 | SETF(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
747 | tr_baud, GET_SPEED(arg)); | |
748 | if (dev) | |
749 | SETS(sync_serial_prescale_shadow, | |
750 | R_SYNC_SERIAL_PRESCALE, clk_sel_u3, | |
751 | baudrate); | |
752 | else | |
753 | SETS(sync_serial_prescale_shadow, | |
754 | R_SYNC_SERIAL_PRESCALE, clk_sel_u1, | |
755 | baudrate); | |
756 | } | |
757 | break; | |
758 | case SSP_MODE: | |
759 | if (arg > 5) | |
760 | return -EINVAL; | |
761 | if (arg == MASTER_OUTPUT || arg == SLAVE_OUTPUT) | |
762 | *R_IRQ_MASK1_CLR = 1 << port->data_avail_bit; | |
763 | else if (!port->use_dma) | |
764 | *R_IRQ_MASK1_SET = 1 << port->data_avail_bit; | |
765 | SETF(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, mode, arg); | |
766 | break; | |
767 | case SSP_FRAME_SYNC: | |
768 | if (arg & NORMAL_SYNC) | |
769 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
770 | f_synctype, normal); | |
771 | else if (arg & EARLY_SYNC) | |
772 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
773 | f_synctype, early); | |
774 | ||
775 | if (arg & BIT_SYNC) | |
776 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
777 | f_syncsize, bit); | |
778 | else if (arg & WORD_SYNC) | |
779 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
780 | f_syncsize, word); | |
781 | else if (arg & EXTENDED_SYNC) | |
782 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
783 | f_syncsize, extended); | |
784 | ||
785 | if (arg & SYNC_ON) | |
786 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
787 | f_sync, on); | |
788 | else if (arg & SYNC_OFF) | |
789 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
790 | f_sync, off); | |
791 | ||
792 | if (arg & WORD_SIZE_8) | |
793 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
794 | wordsize, size8bit); | |
795 | else if (arg & WORD_SIZE_12) | |
796 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
797 | wordsize, size12bit); | |
798 | else if (arg & WORD_SIZE_16) | |
799 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
800 | wordsize, size16bit); | |
801 | else if (arg & WORD_SIZE_24) | |
802 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
803 | wordsize, size24bit); | |
804 | else if (arg & WORD_SIZE_32) | |
805 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
806 | wordsize, size32bit); | |
807 | ||
808 | if (arg & BIT_ORDER_MSB) | |
809 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
810 | bitorder, msb); | |
811 | else if (arg & BIT_ORDER_LSB) | |
812 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
813 | bitorder, lsb); | |
814 | ||
815 | if (arg & FLOW_CONTROL_ENABLE) | |
816 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
817 | flow_ctrl, enabled); | |
818 | else if (arg & FLOW_CONTROL_DISABLE) | |
819 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
820 | flow_ctrl, disabled); | |
821 | ||
822 | if (arg & CLOCK_NOT_GATED) | |
823 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
824 | clk_mode, normal); | |
825 | else if (arg & CLOCK_GATED) | |
826 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
827 | clk_mode, gated); | |
828 | ||
829 | break; | |
830 | case SSP_IPOLARITY: | |
831 | /* NOTE!! negedge is considered NORMAL */ | |
832 | if (arg & CLOCK_NORMAL) | |
833 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
834 | clk_polarity, neg); | |
835 | else if (arg & CLOCK_INVERT) | |
836 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
837 | clk_polarity, pos); | |
838 | ||
839 | if (arg & FRAME_NORMAL) | |
840 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
841 | frame_polarity, normal); | |
842 | else if (arg & FRAME_INVERT) | |
843 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
844 | frame_polarity, inverted); | |
845 | ||
846 | if (arg & STATUS_NORMAL) | |
847 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
848 | status_polarity, normal); | |
849 | else if (arg & STATUS_INVERT) | |
850 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
851 | status_polarity, inverted); | |
852 | break; | |
853 | case SSP_OPOLARITY: | |
854 | if (arg & CLOCK_NORMAL) | |
855 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
856 | clk_driver, normal); | |
857 | else if (arg & CLOCK_INVERT) | |
858 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
859 | clk_driver, inverted); | |
860 | ||
861 | if (arg & FRAME_NORMAL) | |
862 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
863 | frame_driver, normal); | |
864 | else if (arg & FRAME_INVERT) | |
865 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
866 | frame_driver, inverted); | |
867 | ||
868 | if (arg & STATUS_NORMAL) | |
869 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
870 | status_driver, normal); | |
871 | else if (arg & STATUS_INVERT) | |
872 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
873 | status_driver, inverted); | |
874 | break; | |
875 | case SSP_SPI: | |
876 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, flow_ctrl, | |
877 | disabled); | |
878 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, bitorder, | |
879 | msb); | |
880 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, wordsize, | |
881 | size8bit); | |
882 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, f_sync, on); | |
883 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, f_syncsize, | |
884 | word); | |
885 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, f_synctype, | |
886 | normal); | |
887 | if (arg & SPI_SLAVE) { | |
888 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
889 | frame_polarity, inverted); | |
890 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
891 | clk_polarity, neg); | |
892 | SETF(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
893 | mode, SLAVE_INPUT); | |
894 | } else { | |
895 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
896 | frame_driver, inverted); | |
897 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
898 | clk_driver, inverted); | |
899 | SETF(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, | |
900 | mode, MASTER_OUTPUT); | |
901 | } | |
902 | break; | |
903 | case SSP_INBUFCHUNK: | |
904 | #if 0 | |
905 | if (arg > port->in_buffer_size/NUM_IN_DESCR) | |
906 | return -EINVAL; | |
907 | port->inbufchunk = arg; | |
908 | /* Make sure in_buffer_size is a multiple of inbufchunk */ | |
909 | port->in_buffer_size = | |
910 | (port->in_buffer_size/port->inbufchunk) * | |
911 | port->inbufchunk; | |
912 | DEBUG(printk(KERN_DEBUG "inbufchunk %i in_buffer_size: %i\n", | |
913 | port->inbufchunk, port->in_buffer_size)); | |
914 | if (port->use_dma) { | |
915 | if (port->port_nbr == 0) { | |
916 | RESET_DMA(9); | |
917 | WAIT_DMA(9); | |
918 | } else { | |
919 | RESET_DMA(5); | |
920 | WAIT_DMA(5); | |
921 | } | |
922 | start_dma_in(port); | |
923 | } | |
924 | #endif | |
925 | break; | |
926 | default: | |
927 | return_val = -1; | |
928 | } | |
929 | /* Make sure we write the config without interruption */ | |
930 | local_irq_save(flags); | |
931 | /* Set config and enable port */ | |
932 | *port->ctrl_data = port->ctrl_data_shadow; | |
933 | nop(); nop(); nop(); nop(); | |
934 | *R_SYNC_SERIAL_PRESCALE = sync_serial_prescale_shadow; | |
935 | nop(); nop(); nop(); nop(); | |
936 | if (dev) | |
937 | SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode3, sync); | |
938 | else | |
939 | SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode1, sync); | |
940 | ||
941 | *R_GEN_CONFIG_II = gen_config_ii_shadow; | |
942 | /* Reset DMA. At readout from serial port the data could be shifted | |
943 | * one byte if not resetting DMA. | |
944 | */ | |
945 | if (port->use_dma) { | |
946 | if (port->port_nbr == 0) { | |
947 | RESET_DMA(9); | |
948 | WAIT_DMA(9); | |
949 | } else { | |
950 | RESET_DMA(5); | |
951 | WAIT_DMA(5); | |
952 | } | |
953 | start_dma_in(port); | |
954 | } | |
955 | local_irq_restore(flags); | |
956 | return return_val; | |
957 | } | |
958 | ||
90276a1a JN |
959 | static long sync_serial_ioctl(struct file *file, |
960 | unsigned int cmd, unsigned long arg) | |
961 | { | |
962 | long ret; | |
963 | ||
964 | lock_kernel(); | |
965 | ret = sync_serial_ioctl_unlocked(file, cmd, arg); | |
966 | unlock_kernel(); | |
967 | ||
968 | return ret; | |
969 | } | |
970 | ||
c974a9e5 JN |
971 | |
972 | static ssize_t sync_serial_write(struct file *file, const char *buf, | |
973 | size_t count, loff_t *ppos) | |
974 | { | |
975 | int dev = MINOR(file->f_dentry->d_inode->i_rdev); | |
976 | DECLARE_WAITQUEUE(wait, current); | |
977 | struct sync_port *port; | |
978 | unsigned long flags; | |
979 | unsigned long c, c1; | |
980 | unsigned long free_outp; | |
981 | unsigned long outp; | |
982 | unsigned long out_buffer; | |
983 | ||
984 | if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled) { | |
985 | DEBUG(printk(KERN_DEBUG "Invalid minor %d\n", dev)); | |
986 | return -ENODEV; | |
987 | } | |
988 | port = &ports[dev]; | |
989 | ||
990 | DEBUGWRITE(printk(KERN_DEBUG "W d%d c %lu (%d/%d)\n", | |
991 | port->port_nbr, count, port->out_count, OUT_BUFFER_SIZE)); | |
992 | /* Space to end of buffer */ | |
993 | /* | |
994 | * out_buffer <c1>012345<- c ->OUT_BUFFER_SIZE | |
995 | * outp^ +out_count | |
996 | * ^free_outp | |
997 | * out_buffer 45<- c ->0123OUT_BUFFER_SIZE | |
998 | * +out_count outp^ | |
999 | * free_outp | |
1000 | * | |
1001 | */ | |
1002 | ||
1003 | /* Read variables that may be updated by interrupts */ | |
1004 | local_irq_save(flags); | |
1005 | if (count > OUT_BUFFER_SIZE - port->out_count) | |
1006 | count = OUT_BUFFER_SIZE - port->out_count; | |
1007 | ||
1008 | outp = (unsigned long)port->outp; | |
1009 | free_outp = outp + port->out_count; | |
1010 | local_irq_restore(flags); | |
1011 | out_buffer = (unsigned long)port->out_buffer; | |
1012 | ||
1013 | /* Find out where and how much to write */ | |
1014 | if (free_outp >= out_buffer + OUT_BUFFER_SIZE) | |
1015 | free_outp -= OUT_BUFFER_SIZE; | |
1016 | if (free_outp >= outp) | |
1017 | c = out_buffer + OUT_BUFFER_SIZE - free_outp; | |
1018 | else | |
1019 | c = outp - free_outp; | |
1020 | if (c > count) | |
1021 | c = count; | |
1022 | ||
1023 | DEBUGWRITE(printk(KERN_DEBUG "w op %08lX fop %08lX c %lu\n", | |
1024 | outp, free_outp, c)); | |
1025 | if (copy_from_user((void *)free_outp, buf, c)) | |
1026 | return -EFAULT; | |
1027 | ||
1028 | if (c != count) { | |
1029 | buf += c; | |
1030 | c1 = count - c; | |
1031 | DEBUGWRITE(printk(KERN_DEBUG "w2 fi %lu c %lu c1 %lu\n", | |
1032 | free_outp-out_buffer, c, c1)); | |
1033 | if (copy_from_user((void *)out_buffer, buf, c1)) | |
1034 | return -EFAULT; | |
1035 | } | |
1036 | local_irq_save(flags); | |
1037 | port->out_count += count; | |
1038 | local_irq_restore(flags); | |
1039 | ||
1040 | /* Make sure transmitter/receiver is running */ | |
1041 | if (!port->started) { | |
1042 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, clk_halt, | |
1043 | running); | |
1044 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, tr_enable, | |
1045 | enable); | |
1046 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, rec_enable, | |
1047 | enable); | |
1048 | port->started = 1; | |
1049 | } | |
1050 | ||
1051 | *port->ctrl_data = port->ctrl_data_shadow; | |
1052 | ||
1053 | if (file->f_flags & O_NONBLOCK) { | |
1054 | local_irq_save(flags); | |
1055 | if (!port->tr_running) { | |
1056 | if (!port->use_dma) { | |
1057 | /* Start sender by writing data */ | |
1058 | send_word(port); | |
1059 | /* and enable transmitter ready IRQ */ | |
1060 | *R_IRQ_MASK1_SET = 1 << | |
1061 | port->transmitter_ready_bit; | |
1062 | } else | |
1063 | start_dma(port, | |
1064 | (unsigned char *volatile)port->outp, c); | |
1065 | } | |
1066 | local_irq_restore(flags); | |
1067 | DEBUGWRITE(printk(KERN_DEBUG "w d%d c %lu NB\n", | |
1068 | port->port_nbr, count)); | |
1069 | return count; | |
1070 | } | |
1071 | ||
1072 | /* Sleep until all sent */ | |
1073 | add_wait_queue(&port->out_wait_q, &wait); | |
1074 | set_current_state(TASK_INTERRUPTIBLE); | |
1075 | local_irq_save(flags); | |
1076 | if (!port->tr_running) { | |
1077 | if (!port->use_dma) { | |
1078 | /* Start sender by writing data */ | |
1079 | send_word(port); | |
1080 | /* and enable transmitter ready IRQ */ | |
1081 | *R_IRQ_MASK1_SET = 1 << port->transmitter_ready_bit; | |
1082 | } else | |
1083 | start_dma(port, port->outp, c); | |
1084 | } | |
1085 | local_irq_restore(flags); | |
1086 | schedule(); | |
1087 | set_current_state(TASK_RUNNING); | |
1088 | remove_wait_queue(&port->out_wait_q, &wait); | |
1089 | if (signal_pending(current)) | |
1090 | return -EINTR; | |
1091 | ||
1092 | DEBUGWRITE(printk(KERN_DEBUG "w d%d c %lu\n", port->port_nbr, count)); | |
1093 | return count; | |
1094 | } | |
1095 | ||
1096 | static ssize_t sync_serial_read(struct file *file, char *buf, | |
1097 | size_t count, loff_t *ppos) | |
1098 | { | |
1099 | int dev = MINOR(file->f_dentry->d_inode->i_rdev); | |
1100 | int avail; | |
1101 | struct sync_port *port; | |
1102 | unsigned char *start; | |
1103 | unsigned char *end; | |
1104 | unsigned long flags; | |
1105 | ||
1106 | if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled) { | |
1107 | DEBUG(printk(KERN_DEBUG "Invalid minor %d\n", dev)); | |
1108 | return -ENODEV; | |
1109 | } | |
1110 | port = &ports[dev]; | |
1111 | ||
1112 | DEBUGREAD(printk(KERN_DEBUG "R%d c %d ri %lu wi %lu /%lu\n", | |
1113 | dev, count, port->readp - port->flip, | |
1114 | port->writep - port->flip, port->in_buffer_size)); | |
1115 | ||
1116 | if (!port->started) { | |
1117 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, clk_halt, | |
1118 | running); | |
1119 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, tr_enable, | |
1120 | enable); | |
1121 | SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, rec_enable, | |
1122 | enable); | |
1123 | port->started = 1; | |
1124 | } | |
1125 | *port->ctrl_data = port->ctrl_data_shadow; | |
1126 | ||
1127 | /* Calculate number of available bytes */ | |
1128 | /* Save pointers to avoid that they are modified by interrupt */ | |
1129 | local_irq_save(flags); | |
1130 | start = (unsigned char *)port->readp; /* cast away volatile */ | |
1131 | end = (unsigned char *)port->writep; /* cast away volatile */ | |
1132 | local_irq_restore(flags); | |
1133 | while (start == end && !port->full) { | |
1134 | /* No data */ | |
1135 | if (file->f_flags & O_NONBLOCK) | |
1136 | return -EAGAIN; | |
1137 | ||
1138 | interruptible_sleep_on(&port->in_wait_q); | |
1139 | if (signal_pending(current)) | |
1140 | return -EINTR; | |
1141 | ||
1142 | local_irq_save(flags); | |
1143 | start = (unsigned char *)port->readp; /* cast away volatile */ | |
1144 | end = (unsigned char *)port->writep; /* cast away volatile */ | |
1145 | local_irq_restore(flags); | |
1146 | } | |
1147 | ||
1148 | /* Lazy read, never return wrapped data. */ | |
1149 | if (port->full) | |
1150 | avail = port->in_buffer_size; | |
1151 | else if (end > start) | |
1152 | avail = end - start; | |
1153 | else | |
1154 | avail = port->flip + port->in_buffer_size - start; | |
1155 | ||
1156 | count = count > avail ? avail : count; | |
1157 | if (copy_to_user(buf, start, count)) | |
1158 | return -EFAULT; | |
1159 | /* Disable interrupts while updating readp */ | |
1160 | local_irq_save(flags); | |
1161 | port->readp += count; | |
1162 | if (port->readp >= port->flip + port->in_buffer_size) /* Wrap? */ | |
1163 | port->readp = port->flip; | |
1164 | port->full = 0; | |
1165 | local_irq_restore(flags); | |
1166 | DEBUGREAD(printk(KERN_DEBUG "r %d\n", count)); | |
1167 | return count; | |
1168 | } | |
1169 | ||
1170 | static void send_word(struct sync_port *port) | |
1171 | { | |
1172 | switch (IO_EXTRACT(R_SYNC_SERIAL1_CTRL, wordsize, | |
1173 | port->ctrl_data_shadow)) { | |
1174 | case IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, wordsize, size8bit): | |
1175 | port->out_count--; | |
1176 | *port->data_out = *port->outp++; | |
1177 | if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE) | |
1178 | port->outp = port->out_buffer; | |
1179 | break; | |
1180 | case IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, wordsize, size12bit): | |
1181 | { | |
1182 | int data = (*port->outp++) << 8; | |
1183 | data |= *port->outp++; | |
1184 | port->out_count -= 2; | |
1185 | *port->data_out = data; | |
1186 | if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE) | |
1187 | port->outp = port->out_buffer; | |
1188 | break; | |
1189 | } | |
1190 | case IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, wordsize, size16bit): | |
1191 | port->out_count -= 2; | |
1192 | *port->data_out = *(unsigned short *)port->outp; | |
1193 | port->outp += 2; | |
1194 | if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE) | |
1195 | port->outp = port->out_buffer; | |
1196 | break; | |
1197 | case IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, wordsize, size24bit): | |
1198 | port->out_count -= 3; | |
1199 | *port->data_out = *(unsigned int *)port->outp; | |
1200 | port->outp += 3; | |
1201 | if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE) | |
1202 | port->outp = port->out_buffer; | |
1203 | break; | |
1204 | case IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, wordsize, size32bit): | |
1205 | port->out_count -= 4; | |
1206 | *port->data_out = *(unsigned int *)port->outp; | |
1207 | port->outp += 4; | |
1208 | if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE) | |
1209 | port->outp = port->out_buffer; | |
1210 | break; | |
1211 | } | |
1212 | } | |
1213 | ||
1214 | ||
1215 | static void start_dma(struct sync_port *port, const char *data, int count) | |
1216 | { | |
1217 | port->tr_running = 1; | |
1218 | port->out_descr.hw_len = 0; | |
1219 | port->out_descr.next = 0; | |
1220 | port->out_descr.ctrl = d_eol | d_eop; /* No d_wait to avoid glitches */ | |
1221 | port->out_descr.sw_len = count; | |
1222 | port->out_descr.buf = virt_to_phys(data); | |
1223 | port->out_descr.status = 0; | |
1224 | ||
1225 | *port->output_dma_first = virt_to_phys(&port->out_descr); | |
1226 | *port->output_dma_cmd = IO_STATE(R_DMA_CH0_CMD, cmd, start); | |
1227 | DEBUGTXINT(printk(KERN_DEBUG "dma %08lX c %d\n", | |
1228 | (unsigned long)data, count)); | |
1229 | } | |
1230 | ||
1231 | static void start_dma_in(struct sync_port *port) | |
1232 | { | |
1233 | int i; | |
1234 | unsigned long buf; | |
1235 | port->writep = port->flip; | |
1236 | ||
1237 | if (port->writep > port->flip + port->in_buffer_size) { | |
1238 | panic("Offset too large in sync serial driver\n"); | |
1239 | return; | |
1240 | } | |
1241 | buf = virt_to_phys(port->in_buffer); | |
1242 | for (i = 0; i < NUM_IN_DESCR; i++) { | |
1243 | port->in_descr[i].sw_len = port->inbufchunk; | |
1244 | port->in_descr[i].ctrl = d_int; | |
1245 | port->in_descr[i].next = virt_to_phys(&port->in_descr[i+1]); | |
1246 | port->in_descr[i].buf = buf; | |
1247 | port->in_descr[i].hw_len = 0; | |
1248 | port->in_descr[i].status = 0; | |
1249 | port->in_descr[i].fifo_len = 0; | |
1250 | buf += port->inbufchunk; | |
1251 | prepare_rx_descriptor(&port->in_descr[i]); | |
1252 | } | |
1253 | /* Link the last descriptor to the first */ | |
1254 | port->in_descr[i-1].next = virt_to_phys(&port->in_descr[0]); | |
1255 | port->in_descr[i-1].ctrl |= d_eol; | |
1256 | port->next_rx_desc = &port->in_descr[0]; | |
1257 | port->prev_rx_desc = &port->in_descr[NUM_IN_DESCR - 1]; | |
1258 | *port->input_dma_first = virt_to_phys(port->next_rx_desc); | |
1259 | *port->input_dma_cmd = IO_STATE(R_DMA_CH0_CMD, cmd, start); | |
1260 | } | |
1261 | ||
1262 | #ifdef SYNC_SER_DMA | |
1263 | static irqreturn_t tr_interrupt(int irq, void *dev_id) | |
1264 | { | |
1265 | unsigned long ireg = *R_IRQ_MASK2_RD; | |
1266 | struct etrax_dma_descr *descr; | |
1267 | unsigned int sentl; | |
1268 | int handled = 0; | |
1269 | int i; | |
1270 | ||
1271 | for (i = 0; i < NUMBER_OF_PORTS; i++) { | |
1272 | struct sync_port *port = &ports[i]; | |
1273 | if (!port->enabled || !port->use_dma) | |
1274 | continue; | |
1275 | ||
1276 | /* IRQ active for the port? */ | |
1277 | if (!(ireg & (1 << port->output_dma_bit))) | |
1278 | continue; | |
1279 | ||
1280 | handled = 1; | |
1281 | ||
1282 | /* Clear IRQ */ | |
1283 | *port->output_dma_clr_irq = | |
1284 | IO_STATE(R_DMA_CH0_CLR_INTR, clr_eop, do) | | |
1285 | IO_STATE(R_DMA_CH0_CLR_INTR, clr_descr, do); | |
1286 | ||
1287 | descr = &port->out_descr; | |
1288 | if (!(descr->status & d_stop)) | |
1289 | sentl = descr->sw_len; | |
1290 | else | |
1291 | /* Otherwise find amount of data sent here */ | |
1292 | sentl = descr->hw_len; | |
1293 | ||
1294 | port->out_count -= sentl; | |
1295 | port->outp += sentl; | |
1296 | if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE) | |
1297 | port->outp = port->out_buffer; | |
1298 | if (port->out_count) { | |
1299 | int c = port->out_buffer + OUT_BUFFER_SIZE - port->outp; | |
1300 | if (c > port->out_count) | |
1301 | c = port->out_count; | |
1302 | DEBUGTXINT(printk(KERN_DEBUG | |
1303 | "tx_int DMAWRITE %i %i\n", sentl, c)); | |
1304 | start_dma(port, port->outp, c); | |
1305 | } else { | |
1306 | DEBUGTXINT(printk(KERN_DEBUG | |
1307 | "tx_int DMA stop %i\n", sentl)); | |
1308 | port->tr_running = 0; | |
1309 | } | |
1310 | /* wake up the waiting process */ | |
1311 | wake_up_interruptible(&port->out_wait_q); | |
1312 | } | |
1313 | return IRQ_RETVAL(handled); | |
1314 | } /* tr_interrupt */ | |
1315 | ||
1316 | static irqreturn_t rx_interrupt(int irq, void *dev_id) | |
1317 | { | |
1318 | unsigned long ireg = *R_IRQ_MASK2_RD; | |
1319 | int i; | |
1320 | int handled = 0; | |
1321 | ||
1322 | for (i = 0; i < NUMBER_OF_PORTS; i++) { | |
1323 | struct sync_port *port = &ports[i]; | |
1324 | ||
1325 | if (!port->enabled || !port->use_dma) | |
1326 | continue; | |
1327 | ||
1328 | if (!(ireg & (1 << port->input_dma_descr_bit))) | |
1329 | continue; | |
1330 | ||
1331 | /* Descriptor interrupt */ | |
1332 | handled = 1; | |
1333 | while (*port->input_dma_descr != | |
1334 | virt_to_phys(port->next_rx_desc)) { | |
1335 | if (port->writep + port->inbufchunk > port->flip + | |
1336 | port->in_buffer_size) { | |
1337 | int first_size = port->flip + | |
1338 | port->in_buffer_size - port->writep; | |
1339 | memcpy(port->writep, | |
1340 | phys_to_virt(port->next_rx_desc->buf), | |
1341 | first_size); | |
1342 | memcpy(port->flip, | |
1343 | phys_to_virt(port->next_rx_desc->buf + | |
1344 | first_size), | |
1345 | port->inbufchunk - first_size); | |
1346 | port->writep = port->flip + | |
1347 | port->inbufchunk - first_size; | |
1348 | } else { | |
1349 | memcpy(port->writep, | |
1350 | phys_to_virt(port->next_rx_desc->buf), | |
1351 | port->inbufchunk); | |
1352 | port->writep += port->inbufchunk; | |
1353 | if (port->writep >= port->flip | |
1354 | + port->in_buffer_size) | |
1355 | port->writep = port->flip; | |
1356 | } | |
1357 | if (port->writep == port->readp) | |
1358 | port->full = 1; | |
1359 | prepare_rx_descriptor(port->next_rx_desc); | |
1360 | port->next_rx_desc->ctrl |= d_eol; | |
1361 | port->prev_rx_desc->ctrl &= ~d_eol; | |
1362 | port->prev_rx_desc = phys_to_virt((unsigned) | |
1363 | port->next_rx_desc); | |
1364 | port->next_rx_desc = phys_to_virt((unsigned) | |
1365 | port->next_rx_desc->next); | |
1366 | /* Wake up the waiting process */ | |
1367 | wake_up_interruptible(&port->in_wait_q); | |
1368 | *port->input_dma_cmd = IO_STATE(R_DMA_CH1_CMD, | |
1369 | cmd, restart); | |
1370 | /* DMA has reached end of descriptor */ | |
1371 | *port->input_dma_clr_irq = IO_STATE(R_DMA_CH0_CLR_INTR, | |
1372 | clr_descr, do); | |
1373 | } | |
1374 | } | |
1375 | return IRQ_RETVAL(handled); | |
1376 | } /* rx_interrupt */ | |
1377 | #endif /* SYNC_SER_DMA */ | |
1378 | ||
1379 | #ifdef SYNC_SER_MANUAL | |
1380 | static irqreturn_t manual_interrupt(int irq, void *dev_id) | |
1381 | { | |
1382 | int i; | |
1383 | int handled = 0; | |
1384 | ||
1385 | for (i = 0; i < NUMBER_OF_PORTS; i++) { | |
1386 | struct sync_port *port = &ports[i]; | |
1387 | ||
1388 | if (!port->enabled || port->use_dma) | |
1389 | continue; | |
1390 | ||
1391 | /* Data received? */ | |
1392 | if (*R_IRQ_MASK1_RD & (1 << port->data_avail_bit)) { | |
1393 | handled = 1; | |
1394 | /* Read data */ | |
1395 | switch (port->ctrl_data_shadow & | |
1396 | IO_MASK(R_SYNC_SERIAL1_CTRL, wordsize)) { | |
1397 | case IO_STATE(R_SYNC_SERIAL1_CTRL, wordsize, size8bit): | |
1398 | *port->writep++ = | |
1399 | *(volatile char *)port->data_in; | |
1400 | break; | |
1401 | case IO_STATE(R_SYNC_SERIAL1_CTRL, wordsize, size12bit): | |
1402 | { | |
1403 | int data = *(unsigned short *)port->data_in; | |
1404 | *port->writep = (data & 0x0ff0) >> 4; | |
1405 | *(port->writep + 1) = data & 0x0f; | |
1406 | port->writep += 2; | |
1407 | break; | |
1408 | } | |
1409 | case IO_STATE(R_SYNC_SERIAL1_CTRL, wordsize, size16bit): | |
1410 | *(unsigned short *)port->writep = | |
1411 | *(volatile unsigned short *)port->data_in; | |
1412 | port->writep += 2; | |
1413 | break; | |
1414 | case IO_STATE(R_SYNC_SERIAL1_CTRL, wordsize, size24bit): | |
1415 | *(unsigned int *)port->writep = *port->data_in; | |
1416 | port->writep += 3; | |
1417 | break; | |
1418 | case IO_STATE(R_SYNC_SERIAL1_CTRL, wordsize, size32bit): | |
1419 | *(unsigned int *)port->writep = *port->data_in; | |
1420 | port->writep += 4; | |
1421 | break; | |
1422 | } | |
1423 | ||
1424 | /* Wrap? */ | |
1425 | if (port->writep >= port->flip + port->in_buffer_size) | |
1426 | port->writep = port->flip; | |
1427 | if (port->writep == port->readp) { | |
1428 | /* Receive buffer overrun, discard oldest */ | |
1429 | port->readp++; | |
1430 | /* Wrap? */ | |
1431 | if (port->readp >= port->flip + | |
1432 | port->in_buffer_size) | |
1433 | port->readp = port->flip; | |
1434 | } | |
1435 | if (sync_data_avail(port) >= port->inbufchunk) { | |
1436 | /* Wake up application */ | |
1437 | wake_up_interruptible(&port->in_wait_q); | |
1438 | } | |
1439 | } | |
1440 | ||
1441 | /* Transmitter ready? */ | |
1442 | if (*R_IRQ_MASK1_RD & (1 << port->transmitter_ready_bit)) { | |
1443 | if (port->out_count > 0) { | |
1444 | /* More data to send */ | |
1445 | send_word(port); | |
1446 | } else { | |
1447 | /* Transmission finished */ | |
1448 | /* Turn off IRQ */ | |
1449 | *R_IRQ_MASK1_CLR = 1 << | |
1450 | port->transmitter_ready_bit; | |
1451 | /* Wake up application */ | |
1452 | wake_up_interruptible(&port->out_wait_q); | |
1453 | } | |
1454 | } | |
1455 | } | |
1456 | return IRQ_RETVAL(handled); | |
1457 | } | |
1458 | #endif | |
1459 | ||
1460 | module_init(etrax_sync_serial_init); |