crisv10.c 127 KB
Newer Older
Jesper Nilsson's avatar
Jesper Nilsson committed
1
/*
Linus Torvalds's avatar
Linus Torvalds committed
2 3
 * Serial port driver for the ETRAX 100LX chip
 *
Jesper Nilsson's avatar
Jesper Nilsson committed
4
 *    Copyright (C) 1998-2007  Axis Communications AB
Linus Torvalds's avatar
Linus Torvalds committed
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
 *
 *    Many, many authors. Based once upon a time on serial.c for 16x50.
 *
 */

static char *serial_version = "$Revision: 1.25 $";

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/kernel.h>
27
#include <linux/mutex.h>
Jiri Slaby's avatar
Jiri Slaby committed
28
#include <linux/bitops.h>
29 30 31 32 33
#include <linux/seq_file.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/uaccess.h>
#include <linux/io.h>
Linus Torvalds's avatar
Linus Torvalds committed
34 35

#include <asm/irq.h>
Jesper Nilsson's avatar
Jesper Nilsson committed
36
#include <asm/dma.h>
Linus Torvalds's avatar
Linus Torvalds committed
37 38
#include <asm/system.h>

39
#include <arch/svinto.h>
Linus Torvalds's avatar
Linus Torvalds committed
40 41 42 43

/* non-arch dependent serial structures are in linux/serial.h */
#include <linux/serial.h>
/* while we keep our own stuff (struct e100_serial) in a local .h file */
Jesper Nilsson's avatar
Jesper Nilsson committed
44
#include "crisv10.h"
Linus Torvalds's avatar
Linus Torvalds committed
45
#include <asm/fasttimer.h>
46
#include <arch/io_interface_mux.h>
Linus Torvalds's avatar
Linus Torvalds committed
47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161

#ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER
#ifndef CONFIG_ETRAX_FAST_TIMER
#error "Enable FAST_TIMER to use SERIAL_FAST_TIMER"
#endif
#endif

#if defined(CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS) && \
           (CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS == 0)
#error "RX_TIMEOUT_TICKS == 0 not allowed, use 1"
#endif

#if defined(CONFIG_ETRAX_RS485_ON_PA) && defined(CONFIG_ETRAX_RS485_ON_PORT_G)
#error "Disable either CONFIG_ETRAX_RS485_ON_PA or CONFIG_ETRAX_RS485_ON_PORT_G"
#endif

/*
 * All of the compatibilty code so we can compile serial.c against
 * older kernels is hidden in serial_compat.h
 */
#if defined(LOCAL_HEADERS)
#include "serial_compat.h"
#endif

struct tty_driver *serial_driver;

/* number of characters left in xmit buffer before we ask for more */
#define WAKEUP_CHARS 256

//#define SERIAL_DEBUG_INTR
//#define SERIAL_DEBUG_OPEN
//#define SERIAL_DEBUG_FLOW
//#define SERIAL_DEBUG_DATA
//#define SERIAL_DEBUG_THROTTLE
//#define SERIAL_DEBUG_IO  /* Debug for Extra control and status pins */
//#define SERIAL_DEBUG_LINE 0 /* What serport we want to debug */

/* Enable this to use serial interrupts to handle when you
   expect the first received event on the serial port to
   be an error, break or similar. Used to be able to flash IRMA
   from eLinux */
#define SERIAL_HANDLE_EARLY_ERRORS

/* Currently 16 descriptors x 128 bytes = 2048 bytes */
#define SERIAL_DESCR_BUF_SIZE 256

#define SERIAL_PRESCALE_BASE 3125000 /* 3.125MHz */
#define DEF_BAUD_BASE SERIAL_PRESCALE_BASE

/* We don't want to load the system with massive fast timer interrupt
 * on high baudrates so limit it to 250 us (4kHz) */
#define MIN_FLUSH_TIME_USEC 250

/* Add an x here to log a lot of timer stuff */
#define TIMERD(x)
/* Debug details of interrupt handling */
#define DINTR1(x)  /* irq on/off, errors */
#define DINTR2(x)    /* tx and rx */
/* Debug flip buffer stuff */
#define DFLIP(x)
/* Debug flow control and overview of data flow */
#define DFLOW(x)
#define DBAUD(x)
#define DLOG_INT_TRIG(x)

//#define DEBUG_LOG_INCLUDED
#ifndef DEBUG_LOG_INCLUDED
#define DEBUG_LOG(line, string, value)
#else
struct debug_log_info
{
	unsigned long time;
	unsigned long timer_data;
//  int line;
	const char *string;
	int value;
};
#define DEBUG_LOG_SIZE 4096

struct debug_log_info debug_log[DEBUG_LOG_SIZE];
int debug_log_pos = 0;

#define DEBUG_LOG(_line, _string, _value) do { \
  if ((_line) == SERIAL_DEBUG_LINE) {\
    debug_log_func(_line, _string, _value); \
  }\
}while(0)

void debug_log_func(int line, const char *string, int value)
{
	if (debug_log_pos < DEBUG_LOG_SIZE) {
		debug_log[debug_log_pos].time = jiffies;
		debug_log[debug_log_pos].timer_data = *R_TIMER_DATA;
//    debug_log[debug_log_pos].line = line;
		debug_log[debug_log_pos].string = string;
		debug_log[debug_log_pos].value = value;
		debug_log_pos++;
	}
	/*printk(string, value);*/
}
#endif

#ifndef CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS
/* Default number of timer ticks before flushing rx fifo
 * When using "little data, low latency applications: use 0
 * When using "much data applications (PPP)" use ~5
 */
#define CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS 5
#endif

unsigned long timer_data_to_ns(unsigned long timer_data);

static void change_speed(struct e100_serial *info);
static void rs_throttle(struct tty_struct * tty);
static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
Jesper Nilsson's avatar
Jesper Nilsson committed
162 163
static int rs_write(struct tty_struct *tty,
		const unsigned char *buf, int count);
Linus Torvalds's avatar
Linus Torvalds committed
164
#ifdef CONFIG_ETRAX_RS485
Jesper Nilsson's avatar
Jesper Nilsson committed
165 166
static int e100_write_rs485(struct tty_struct *tty,
		const unsigned char *buf, int count);
Linus Torvalds's avatar
Linus Torvalds committed
167
#endif
Jesper Nilsson's avatar
Jesper Nilsson committed
168
static int get_lsr_info(struct e100_serial *info, unsigned int *value);
Linus Torvalds's avatar
Linus Torvalds committed
169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238


#define DEF_BAUD 115200   /* 115.2 kbit/s */
#define STD_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST)
#define DEF_RX 0x20  /* or SERIAL_CTRL_W >> 8 */
/* Default value of tx_ctrl register: has txd(bit 7)=1 (idle) as default */
#define DEF_TX 0x80  /* or SERIAL_CTRL_B */

/* offsets from R_SERIALx_CTRL */

#define REG_DATA 0
#define REG_DATA_STATUS32 0 /* this is the 32 bit register R_SERIALx_READ */
#define REG_TR_DATA 0
#define REG_STATUS 1
#define REG_TR_CTRL 1
#define REG_REC_CTRL 2
#define REG_BAUD 3
#define REG_XOFF 4  /* this is a 32 bit register */

/* The bitfields are the same for all serial ports */
#define SER_RXD_MASK         IO_MASK(R_SERIAL0_STATUS, rxd)
#define SER_DATA_AVAIL_MASK  IO_MASK(R_SERIAL0_STATUS, data_avail)
#define SER_FRAMING_ERR_MASK IO_MASK(R_SERIAL0_STATUS, framing_err)
#define SER_PAR_ERR_MASK     IO_MASK(R_SERIAL0_STATUS, par_err)
#define SER_OVERRUN_MASK     IO_MASK(R_SERIAL0_STATUS, overrun)

#define SER_ERROR_MASK (SER_OVERRUN_MASK | SER_PAR_ERR_MASK | SER_FRAMING_ERR_MASK)

/* Values for info->errorcode */
#define ERRCODE_SET_BREAK    (TTY_BREAK)
#define ERRCODE_INSERT        0x100
#define ERRCODE_INSERT_BREAK (ERRCODE_INSERT | TTY_BREAK)

#define FORCE_EOP(info)  *R_SET_EOP = 1U << info->iseteop;

/*
 * General note regarding the use of IO_* macros in this file:
 *
 * We will use the bits defined for DMA channel 6 when using various
 * IO_* macros (e.g. IO_STATE, IO_MASK, IO_EXTRACT) and _assume_ they are
 * the same for all channels (which of course they are).
 *
 * We will also use the bits defined for serial port 0 when writing commands
 * to the different ports, as these bits too are the same for all ports.
 */


/* Mask for the irqs possibly enabled in R_IRQ_MASK1_RD etc. */
static const unsigned long e100_ser_int_mask = 0
#ifdef CONFIG_ETRAX_SERIAL_PORT0
| IO_MASK(R_IRQ_MASK1_RD, ser0_data) | IO_MASK(R_IRQ_MASK1_RD, ser0_ready)
#endif
#ifdef CONFIG_ETRAX_SERIAL_PORT1
| IO_MASK(R_IRQ_MASK1_RD, ser1_data) | IO_MASK(R_IRQ_MASK1_RD, ser1_ready)
#endif
#ifdef CONFIG_ETRAX_SERIAL_PORT2
| IO_MASK(R_IRQ_MASK1_RD, ser2_data) | IO_MASK(R_IRQ_MASK1_RD, ser2_ready)
#endif
#ifdef CONFIG_ETRAX_SERIAL_PORT3
| IO_MASK(R_IRQ_MASK1_RD, ser3_data) | IO_MASK(R_IRQ_MASK1_RD, ser3_ready)
#endif
;
unsigned long r_alt_ser_baudrate_shadow = 0;

/* this is the data for the four serial ports in the etrax100 */
/*  DMA2(ser2), DMA4(ser3), DMA6(ser0) or DMA8(ser1) */
/* R_DMA_CHx_CLR_INTR, R_DMA_CHx_FIRST, R_DMA_CHx_CMD */

static struct e100_serial rs_table[] = {
	{ .baud        = DEF_BAUD,
Alan Cox's avatar
Alan Cox committed
239
	  .ioport        = (unsigned char *)R_SERIAL0_CTRL,
Linus Torvalds's avatar
Linus Torvalds committed
240 241 242 243 244 245 246 247 248 249 250 251 252
	  .irq         = 1U << 12, /* uses DMA 6 and 7 */
	  .oclrintradr = R_DMA_CH6_CLR_INTR,
	  .ofirstadr   = R_DMA_CH6_FIRST,
	  .ocmdadr     = R_DMA_CH6_CMD,
	  .ostatusadr  = R_DMA_CH6_STATUS,
	  .iclrintradr = R_DMA_CH7_CLR_INTR,
	  .ifirstadr   = R_DMA_CH7_FIRST,
	  .icmdadr     = R_DMA_CH7_CMD,
	  .idescradr   = R_DMA_CH7_DESCR,
	  .flags       = STD_FLAGS,
	  .rx_ctrl     = DEF_RX,
	  .tx_ctrl     = DEF_TX,
	  .iseteop     = 2,
Jesper Nilsson's avatar
Jesper Nilsson committed
253 254
	  .dma_owner   = dma_ser0,
	  .io_if       = if_serial_0,
Linus Torvalds's avatar
Linus Torvalds committed
255 256 257 258
#ifdef CONFIG_ETRAX_SERIAL_PORT0
          .enabled  = 1,
#ifdef CONFIG_ETRAX_SERIAL_PORT0_DMA6_OUT
	  .dma_out_enabled = 1,
Jesper Nilsson's avatar
Jesper Nilsson committed
259 260 261 262
	  .dma_out_nbr = SER0_TX_DMA_NBR,
	  .dma_out_irq_nbr = SER0_DMA_TX_IRQ_NBR,
	  .dma_out_irq_flags = IRQF_DISABLED,
	  .dma_out_irq_description = "serial 0 dma tr",
Linus Torvalds's avatar
Linus Torvalds committed
263 264
#else
	  .dma_out_enabled = 0,
Jesper Nilsson's avatar
Jesper Nilsson committed
265 266 267 268
	  .dma_out_nbr = UINT_MAX,
	  .dma_out_irq_nbr = 0,
	  .dma_out_irq_flags = 0,
	  .dma_out_irq_description = NULL,
Linus Torvalds's avatar
Linus Torvalds committed
269 270 271
#endif
#ifdef CONFIG_ETRAX_SERIAL_PORT0_DMA7_IN
	  .dma_in_enabled = 1,
Jesper Nilsson's avatar
Jesper Nilsson committed
272 273 274 275
	  .dma_in_nbr = SER0_RX_DMA_NBR,
	  .dma_in_irq_nbr = SER0_DMA_RX_IRQ_NBR,
	  .dma_in_irq_flags = IRQF_DISABLED,
	  .dma_in_irq_description = "serial 0 dma rec",
Linus Torvalds's avatar
Linus Torvalds committed
276
#else
Jesper Nilsson's avatar
Jesper Nilsson committed
277 278 279 280 281
	  .dma_in_enabled = 0,
	  .dma_in_nbr = UINT_MAX,
	  .dma_in_irq_nbr = 0,
	  .dma_in_irq_flags = 0,
	  .dma_in_irq_description = NULL,
Linus Torvalds's avatar
Linus Torvalds committed
282 283 284
#endif
#else
          .enabled  = 0,
Jesper Nilsson's avatar
Jesper Nilsson committed
285
	  .io_if_description = NULL,
Linus Torvalds's avatar
Linus Torvalds committed
286 287 288 289 290 291 292
	  .dma_out_enabled = 0,
	  .dma_in_enabled = 0
#endif

},  /* ttyS0 */
#ifndef CONFIG_SVINTO_SIM
	{ .baud        = DEF_BAUD,
Alan Cox's avatar
Alan Cox committed
293
	  .ioport        = (unsigned char *)R_SERIAL1_CTRL,
Linus Torvalds's avatar
Linus Torvalds committed
294 295 296 297 298 299 300 301 302 303 304 305 306
	  .irq         = 1U << 16, /* uses DMA 8 and 9 */
	  .oclrintradr = R_DMA_CH8_CLR_INTR,
	  .ofirstadr   = R_DMA_CH8_FIRST,
	  .ocmdadr     = R_DMA_CH8_CMD,
	  .ostatusadr  = R_DMA_CH8_STATUS,
	  .iclrintradr = R_DMA_CH9_CLR_INTR,
	  .ifirstadr   = R_DMA_CH9_FIRST,
	  .icmdadr     = R_DMA_CH9_CMD,
	  .idescradr   = R_DMA_CH9_DESCR,
	  .flags       = STD_FLAGS,
	  .rx_ctrl     = DEF_RX,
	  .tx_ctrl     = DEF_TX,
	  .iseteop     = 3,
Jesper Nilsson's avatar
Jesper Nilsson committed
307 308
	  .dma_owner   = dma_ser1,
	  .io_if       = if_serial_1,
Linus Torvalds's avatar
Linus Torvalds committed
309 310
#ifdef CONFIG_ETRAX_SERIAL_PORT1
          .enabled  = 1,
Jesper Nilsson's avatar
Jesper Nilsson committed
311
	  .io_if_description = "ser1",
Linus Torvalds's avatar
Linus Torvalds committed
312 313
#ifdef CONFIG_ETRAX_SERIAL_PORT1_DMA8_OUT
	  .dma_out_enabled = 1,
Jesper Nilsson's avatar
Jesper Nilsson committed
314 315 316 317
	  .dma_out_nbr = SER1_TX_DMA_NBR,
	  .dma_out_irq_nbr = SER1_DMA_TX_IRQ_NBR,
	  .dma_out_irq_flags = IRQF_DISABLED,
	  .dma_out_irq_description = "serial 1 dma tr",
Linus Torvalds's avatar
Linus Torvalds committed
318 319
#else
	  .dma_out_enabled = 0,
Jesper Nilsson's avatar
Jesper Nilsson committed
320 321 322 323
	  .dma_out_nbr = UINT_MAX,
	  .dma_out_irq_nbr = 0,
	  .dma_out_irq_flags = 0,
	  .dma_out_irq_description = NULL,
Linus Torvalds's avatar
Linus Torvalds committed
324 325 326
#endif
#ifdef CONFIG_ETRAX_SERIAL_PORT1_DMA9_IN
	  .dma_in_enabled = 1,
Jesper Nilsson's avatar
Jesper Nilsson committed
327 328 329 330
	  .dma_in_nbr = SER1_RX_DMA_NBR,
	  .dma_in_irq_nbr = SER1_DMA_RX_IRQ_NBR,
	  .dma_in_irq_flags = IRQF_DISABLED,
	  .dma_in_irq_description = "serial 1 dma rec",
Linus Torvalds's avatar
Linus Torvalds committed
331
#else
Jesper Nilsson's avatar
Jesper Nilsson committed
332 333 334 335 336 337
	  .dma_in_enabled = 0,
	  .dma_in_enabled = 0,
	  .dma_in_nbr = UINT_MAX,
	  .dma_in_irq_nbr = 0,
	  .dma_in_irq_flags = 0,
	  .dma_in_irq_description = NULL,
Linus Torvalds's avatar
Linus Torvalds committed
338 339 340
#endif
#else
          .enabled  = 0,
Jesper Nilsson's avatar
Jesper Nilsson committed
341 342
	  .io_if_description = NULL,
	  .dma_in_irq_nbr = 0,
Linus Torvalds's avatar
Linus Torvalds committed
343 344 345 346 347 348
	  .dma_out_enabled = 0,
	  .dma_in_enabled = 0
#endif
},  /* ttyS1 */

	{ .baud        = DEF_BAUD,
Alan Cox's avatar
Alan Cox committed
349
	  .ioport        = (unsigned char *)R_SERIAL2_CTRL,
Linus Torvalds's avatar
Linus Torvalds committed
350 351 352 353 354 355 356 357 358 359 360 361 362
	  .irq         = 1U << 4,  /* uses DMA 2 and 3 */
	  .oclrintradr = R_DMA_CH2_CLR_INTR,
	  .ofirstadr   = R_DMA_CH2_FIRST,
	  .ocmdadr     = R_DMA_CH2_CMD,
	  .ostatusadr  = R_DMA_CH2_STATUS,
	  .iclrintradr = R_DMA_CH3_CLR_INTR,
	  .ifirstadr   = R_DMA_CH3_FIRST,
	  .icmdadr     = R_DMA_CH3_CMD,
	  .idescradr   = R_DMA_CH3_DESCR,
	  .flags       = STD_FLAGS,
	  .rx_ctrl     = DEF_RX,
	  .tx_ctrl     = DEF_TX,
	  .iseteop     = 0,
Jesper Nilsson's avatar
Jesper Nilsson committed
363 364
	  .dma_owner   = dma_ser2,
	  .io_if       = if_serial_2,
Linus Torvalds's avatar
Linus Torvalds committed
365 366
#ifdef CONFIG_ETRAX_SERIAL_PORT2
          .enabled  = 1,
Jesper Nilsson's avatar
Jesper Nilsson committed
367
	  .io_if_description = "ser2",
Linus Torvalds's avatar
Linus Torvalds committed
368 369
#ifdef CONFIG_ETRAX_SERIAL_PORT2_DMA2_OUT
	  .dma_out_enabled = 1,
Jesper Nilsson's avatar
Jesper Nilsson committed
370 371 372 373
	  .dma_out_nbr = SER2_TX_DMA_NBR,
	  .dma_out_irq_nbr = SER2_DMA_TX_IRQ_NBR,
	  .dma_out_irq_flags = IRQF_DISABLED,
	  .dma_out_irq_description = "serial 2 dma tr",
Linus Torvalds's avatar
Linus Torvalds committed
374 375
#else
	  .dma_out_enabled = 0,
Jesper Nilsson's avatar
Jesper Nilsson committed
376 377 378 379
	  .dma_out_nbr = UINT_MAX,
	  .dma_out_irq_nbr = 0,
	  .dma_out_irq_flags = 0,
	  .dma_out_irq_description = NULL,
Linus Torvalds's avatar
Linus Torvalds committed
380 381 382
#endif
#ifdef CONFIG_ETRAX_SERIAL_PORT2_DMA3_IN
	  .dma_in_enabled = 1,
Jesper Nilsson's avatar
Jesper Nilsson committed
383 384 385 386
	  .dma_in_nbr = SER2_RX_DMA_NBR,
	  .dma_in_irq_nbr = SER2_DMA_RX_IRQ_NBR,
	  .dma_in_irq_flags = IRQF_DISABLED,
	  .dma_in_irq_description = "serial 2 dma rec",
Linus Torvalds's avatar
Linus Torvalds committed
387
#else
Jesper Nilsson's avatar
Jesper Nilsson committed
388 389 390 391 392
	  .dma_in_enabled = 0,
	  .dma_in_nbr = UINT_MAX,
	  .dma_in_irq_nbr = 0,
	  .dma_in_irq_flags = 0,
	  .dma_in_irq_description = NULL,
Linus Torvalds's avatar
Linus Torvalds committed
393 394 395
#endif
#else
          .enabled  = 0,
Jesper Nilsson's avatar
Jesper Nilsson committed
396
	  .io_if_description = NULL,
Linus Torvalds's avatar
Linus Torvalds committed
397 398 399 400 401 402
	  .dma_out_enabled = 0,
	  .dma_in_enabled = 0
#endif
 },  /* ttyS2 */

	{ .baud        = DEF_BAUD,
Alan Cox's avatar
Alan Cox committed
403
	  .ioport        = (unsigned char *)R_SERIAL3_CTRL,
Linus Torvalds's avatar
Linus Torvalds committed
404 405 406 407 408 409 410 411 412 413 414 415 416
	  .irq         = 1U << 8,  /* uses DMA 4 and 5 */
	  .oclrintradr = R_DMA_CH4_CLR_INTR,
	  .ofirstadr   = R_DMA_CH4_FIRST,
	  .ocmdadr     = R_DMA_CH4_CMD,
	  .ostatusadr  = R_DMA_CH4_STATUS,
	  .iclrintradr = R_DMA_CH5_CLR_INTR,
	  .ifirstadr   = R_DMA_CH5_FIRST,
	  .icmdadr     = R_DMA_CH5_CMD,
	  .idescradr   = R_DMA_CH5_DESCR,
	  .flags       = STD_FLAGS,
	  .rx_ctrl     = DEF_RX,
	  .tx_ctrl     = DEF_TX,
	  .iseteop     = 1,
Jesper Nilsson's avatar
Jesper Nilsson committed
417 418
	  .dma_owner   = dma_ser3,
	  .io_if       = if_serial_3,
Linus Torvalds's avatar
Linus Torvalds committed
419 420
#ifdef CONFIG_ETRAX_SERIAL_PORT3
          .enabled  = 1,
Jesper Nilsson's avatar
Jesper Nilsson committed
421
	  .io_if_description = "ser3",
Linus Torvalds's avatar
Linus Torvalds committed
422 423
#ifdef CONFIG_ETRAX_SERIAL_PORT3_DMA4_OUT
	  .dma_out_enabled = 1,
Jesper Nilsson's avatar
Jesper Nilsson committed
424 425 426 427
	  .dma_out_nbr = SER3_TX_DMA_NBR,
	  .dma_out_irq_nbr = SER3_DMA_TX_IRQ_NBR,
	  .dma_out_irq_flags = IRQF_DISABLED,
	  .dma_out_irq_description = "serial 3 dma tr",
Linus Torvalds's avatar
Linus Torvalds committed
428 429
#else
	  .dma_out_enabled = 0,
Jesper Nilsson's avatar
Jesper Nilsson committed
430 431 432 433
	  .dma_out_nbr = UINT_MAX,
	  .dma_out_irq_nbr = 0,
	  .dma_out_irq_flags = 0,
	  .dma_out_irq_description = NULL,
Linus Torvalds's avatar
Linus Torvalds committed
434 435 436
#endif
#ifdef CONFIG_ETRAX_SERIAL_PORT3_DMA5_IN
	  .dma_in_enabled = 1,
Jesper Nilsson's avatar
Jesper Nilsson committed
437 438 439 440
	  .dma_in_nbr = SER3_RX_DMA_NBR,
	  .dma_in_irq_nbr = SER3_DMA_RX_IRQ_NBR,
	  .dma_in_irq_flags = IRQF_DISABLED,
	  .dma_in_irq_description = "serial 3 dma rec",
Linus Torvalds's avatar
Linus Torvalds committed
441
#else
Jesper Nilsson's avatar
Jesper Nilsson committed
442 443 444 445 446
	  .dma_in_enabled = 0,
	  .dma_in_nbr = UINT_MAX,
	  .dma_in_irq_nbr = 0,
	  .dma_in_irq_flags = 0,
	  .dma_in_irq_description = NULL
Linus Torvalds's avatar
Linus Torvalds committed
447 448 449
#endif
#else
          .enabled  = 0,
Jesper Nilsson's avatar
Jesper Nilsson committed
450
	  .io_if_description = NULL,
Linus Torvalds's avatar
Linus Torvalds committed
451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941
	  .dma_out_enabled = 0,
	  .dma_in_enabled = 0
#endif
 }   /* ttyS3 */
#endif
};


#define NR_PORTS (sizeof(rs_table)/sizeof(struct e100_serial))

#ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER
static struct fast_timer fast_timers[NR_PORTS];
#endif

#ifdef CONFIG_ETRAX_SERIAL_PROC_ENTRY
#define PROCSTAT(x) x
struct ser_statistics_type {
	int overrun_cnt;
	int early_errors_cnt;
	int ser_ints_ok_cnt;
	int errors_cnt;
	unsigned long int processing_flip;
	unsigned long processing_flip_still_room;
	unsigned long int timeout_flush_cnt;
	int rx_dma_ints;
	int tx_dma_ints;
	int rx_tot;
	int tx_tot;
};

static struct ser_statistics_type ser_stat[NR_PORTS];

#else

#define PROCSTAT(x)

#endif /* CONFIG_ETRAX_SERIAL_PROC_ENTRY */

/* RS-485 */
#if defined(CONFIG_ETRAX_RS485)
#ifdef CONFIG_ETRAX_FAST_TIMER
static struct fast_timer fast_timers_rs485[NR_PORTS];
#endif
#if defined(CONFIG_ETRAX_RS485_ON_PA)
static int rs485_pa_bit = CONFIG_ETRAX_RS485_ON_PA_BIT;
#endif
#if defined(CONFIG_ETRAX_RS485_ON_PORT_G)
static int rs485_port_g_bit = CONFIG_ETRAX_RS485_ON_PORT_G_BIT;
#endif
#endif

/* Info and macros needed for each ports extra control/status signals. */
#define E100_STRUCT_PORT(line, pinname) \
 ((CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT >= 0)? \
		(R_PORT_PA_DATA): ( \
 (CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT >= 0)? \
		(R_PORT_PB_DATA):&dummy_ser[line]))

#define E100_STRUCT_SHADOW(line, pinname) \
 ((CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT >= 0)? \
		(&port_pa_data_shadow): ( \
 (CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT >= 0)? \
		(&port_pb_data_shadow):&dummy_ser[line]))
#define E100_STRUCT_MASK(line, pinname) \
 ((CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT >= 0)? \
		(1<<CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT): ( \
 (CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT >= 0)? \
		(1<<CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT):DUMMY_##pinname##_MASK))

#define DUMMY_DTR_MASK 1
#define DUMMY_RI_MASK  2
#define DUMMY_DSR_MASK 4
#define DUMMY_CD_MASK  8
static unsigned char dummy_ser[NR_PORTS] = {0xFF, 0xFF, 0xFF,0xFF};

/* If not all status pins are used or disabled, use mixed mode */
#ifdef CONFIG_ETRAX_SERIAL_PORT0

#define SER0_PA_BITSUM (CONFIG_ETRAX_SER0_DTR_ON_PA_BIT+CONFIG_ETRAX_SER0_RI_ON_PA_BIT+CONFIG_ETRAX_SER0_DSR_ON_PA_BIT+CONFIG_ETRAX_SER0_CD_ON_PA_BIT)

#if SER0_PA_BITSUM != -4
#  if CONFIG_ETRAX_SER0_DTR_ON_PA_BIT == -1
#    ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
#      define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
#    endif
#   endif
# if CONFIG_ETRAX_SER0_RI_ON_PA_BIT == -1
#   ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
#     define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
#   endif
#  endif
#  if CONFIG_ETRAX_SER0_DSR_ON_PA_BIT == -1
#    ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
#      define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
#    endif
#  endif
#  if CONFIG_ETRAX_SER0_CD_ON_PA_BIT == -1
#    ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
#      define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
#    endif
#  endif
#endif

#define SER0_PB_BITSUM (CONFIG_ETRAX_SER0_DTR_ON_PB_BIT+CONFIG_ETRAX_SER0_RI_ON_PB_BIT+CONFIG_ETRAX_SER0_DSR_ON_PB_BIT+CONFIG_ETRAX_SER0_CD_ON_PB_BIT)

#if SER0_PB_BITSUM != -4
#  if CONFIG_ETRAX_SER0_DTR_ON_PB_BIT == -1
#    ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
#      define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
#    endif
#   endif
# if CONFIG_ETRAX_SER0_RI_ON_PB_BIT == -1
#   ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
#     define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
#   endif
#  endif
#  if CONFIG_ETRAX_SER0_DSR_ON_PB_BIT == -1
#    ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
#      define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
#    endif
#  endif
#  if CONFIG_ETRAX_SER0_CD_ON_PB_BIT == -1
#    ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
#      define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
#    endif
#  endif
#endif

#endif /* PORT0 */


#ifdef CONFIG_ETRAX_SERIAL_PORT1

#define SER1_PA_BITSUM (CONFIG_ETRAX_SER1_DTR_ON_PA_BIT+CONFIG_ETRAX_SER1_RI_ON_PA_BIT+CONFIG_ETRAX_SER1_DSR_ON_PA_BIT+CONFIG_ETRAX_SER1_CD_ON_PA_BIT)

#if SER1_PA_BITSUM != -4
#  if CONFIG_ETRAX_SER1_DTR_ON_PA_BIT == -1
#    ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
#      define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
#    endif
#   endif
# if CONFIG_ETRAX_SER1_RI_ON_PA_BIT == -1
#   ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
#     define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
#   endif
#  endif
#  if CONFIG_ETRAX_SER1_DSR_ON_PA_BIT == -1
#    ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
#      define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
#    endif
#  endif
#  if CONFIG_ETRAX_SER1_CD_ON_PA_BIT == -1
#    ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
#      define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
#    endif
#  endif
#endif

#define SER1_PB_BITSUM (CONFIG_ETRAX_SER1_DTR_ON_PB_BIT+CONFIG_ETRAX_SER1_RI_ON_PB_BIT+CONFIG_ETRAX_SER1_DSR_ON_PB_BIT+CONFIG_ETRAX_SER1_CD_ON_PB_BIT)

#if SER1_PB_BITSUM != -4
#  if CONFIG_ETRAX_SER1_DTR_ON_PB_BIT == -1
#    ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
#      define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
#    endif
#   endif
# if CONFIG_ETRAX_SER1_RI_ON_PB_BIT == -1
#   ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
#     define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
#   endif
#  endif
#  if CONFIG_ETRAX_SER1_DSR_ON_PB_BIT == -1
#    ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
#      define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
#    endif
#  endif
#  if CONFIG_ETRAX_SER1_CD_ON_PB_BIT == -1
#    ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
#      define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
#    endif
#  endif
#endif

#endif /* PORT1 */

#ifdef CONFIG_ETRAX_SERIAL_PORT2

#define SER2_PA_BITSUM (CONFIG_ETRAX_SER2_DTR_ON_PA_BIT+CONFIG_ETRAX_SER2_RI_ON_PA_BIT+CONFIG_ETRAX_SER2_DSR_ON_PA_BIT+CONFIG_ETRAX_SER2_CD_ON_PA_BIT)

#if SER2_PA_BITSUM != -4
#  if CONFIG_ETRAX_SER2_DTR_ON_PA_BIT == -1
#    ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
#      define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
#    endif
#   endif
# if CONFIG_ETRAX_SER2_RI_ON_PA_BIT == -1
#   ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
#     define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
#   endif
#  endif
#  if CONFIG_ETRAX_SER2_DSR_ON_PA_BIT == -1
#    ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
#      define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
#    endif
#  endif
#  if CONFIG_ETRAX_SER2_CD_ON_PA_BIT == -1
#    ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
#      define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
#    endif
#  endif
#endif

#define SER2_PB_BITSUM (CONFIG_ETRAX_SER2_DTR_ON_PB_BIT+CONFIG_ETRAX_SER2_RI_ON_PB_BIT+CONFIG_ETRAX_SER2_DSR_ON_PB_BIT+CONFIG_ETRAX_SER2_CD_ON_PB_BIT)

#if SER2_PB_BITSUM != -4
#  if CONFIG_ETRAX_SER2_DTR_ON_PB_BIT == -1
#    ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
#      define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
#    endif
#   endif
# if CONFIG_ETRAX_SER2_RI_ON_PB_BIT == -1
#   ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
#     define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
#   endif
#  endif
#  if CONFIG_ETRAX_SER2_DSR_ON_PB_BIT == -1
#    ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
#      define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
#    endif
#  endif
#  if CONFIG_ETRAX_SER2_CD_ON_PB_BIT == -1
#    ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
#      define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
#    endif
#  endif
#endif

#endif /* PORT2 */

#ifdef CONFIG_ETRAX_SERIAL_PORT3

#define SER3_PA_BITSUM (CONFIG_ETRAX_SER3_DTR_ON_PA_BIT+CONFIG_ETRAX_SER3_RI_ON_PA_BIT+CONFIG_ETRAX_SER3_DSR_ON_PA_BIT+CONFIG_ETRAX_SER3_CD_ON_PA_BIT)

#if SER3_PA_BITSUM != -4
#  if CONFIG_ETRAX_SER3_DTR_ON_PA_BIT == -1
#    ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
#      define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
#    endif
#   endif
# if CONFIG_ETRAX_SER3_RI_ON_PA_BIT == -1
#   ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
#     define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
#   endif
#  endif
#  if CONFIG_ETRAX_SER3_DSR_ON_PA_BIT == -1
#    ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
#      define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
#    endif
#  endif
#  if CONFIG_ETRAX_SER3_CD_ON_PA_BIT == -1
#    ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
#      define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
#    endif
#  endif
#endif

#define SER3_PB_BITSUM (CONFIG_ETRAX_SER3_DTR_ON_PB_BIT+CONFIG_ETRAX_SER3_RI_ON_PB_BIT+CONFIG_ETRAX_SER3_DSR_ON_PB_BIT+CONFIG_ETRAX_SER3_CD_ON_PB_BIT)

#if SER3_PB_BITSUM != -4
#  if CONFIG_ETRAX_SER3_DTR_ON_PB_BIT == -1
#    ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
#      define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
#    endif
#   endif
# if CONFIG_ETRAX_SER3_RI_ON_PB_BIT == -1
#   ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
#     define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
#   endif
#  endif
#  if CONFIG_ETRAX_SER3_DSR_ON_PB_BIT == -1
#    ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
#      define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
#    endif
#  endif
#  if CONFIG_ETRAX_SER3_CD_ON_PB_BIT == -1
#    ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
#      define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
#    endif
#  endif
#endif

#endif /* PORT3 */


#if defined(CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED) || \
    defined(CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED) || \
    defined(CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED) || \
    defined(CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED)
#define CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED
#endif

#ifdef CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED
/* The pins can be mixed on PA and PB */
#define CONTROL_PINS_PORT_NOT_USED(line) \
  &dummy_ser[line], &dummy_ser[line], \
  &dummy_ser[line], &dummy_ser[line], \
  &dummy_ser[line], &dummy_ser[line], \
  &dummy_ser[line], &dummy_ser[line], \
  DUMMY_DTR_MASK, DUMMY_RI_MASK, DUMMY_DSR_MASK, DUMMY_CD_MASK


struct control_pins
{
	volatile unsigned char *dtr_port;
	unsigned char          *dtr_shadow;
	volatile unsigned char *ri_port;
	unsigned char          *ri_shadow;
	volatile unsigned char *dsr_port;
	unsigned char          *dsr_shadow;
	volatile unsigned char *cd_port;
	unsigned char          *cd_shadow;

	unsigned char dtr_mask;
	unsigned char ri_mask;
	unsigned char dsr_mask;
	unsigned char cd_mask;
};

static const struct control_pins e100_modem_pins[NR_PORTS] =
{
	/* Ser 0 */
	{
#ifdef CONFIG_ETRAX_SERIAL_PORT0
	E100_STRUCT_PORT(0,DTR), E100_STRUCT_SHADOW(0,DTR),
	E100_STRUCT_PORT(0,RI),  E100_STRUCT_SHADOW(0,RI),
	E100_STRUCT_PORT(0,DSR), E100_STRUCT_SHADOW(0,DSR),
	E100_STRUCT_PORT(0,CD),  E100_STRUCT_SHADOW(0,CD),
	E100_STRUCT_MASK(0,DTR),
	E100_STRUCT_MASK(0,RI),
	E100_STRUCT_MASK(0,DSR),
	E100_STRUCT_MASK(0,CD)
#else
	CONTROL_PINS_PORT_NOT_USED(0)
#endif
	},

	/* Ser 1 */
	{
#ifdef CONFIG_ETRAX_SERIAL_PORT1
	E100_STRUCT_PORT(1,DTR), E100_STRUCT_SHADOW(1,DTR),
	E100_STRUCT_PORT(1,RI),  E100_STRUCT_SHADOW(1,RI),
	E100_STRUCT_PORT(1,DSR), E100_STRUCT_SHADOW(1,DSR),
	E100_STRUCT_PORT(1,CD),  E100_STRUCT_SHADOW(1,CD),
	E100_STRUCT_MASK(1,DTR),
	E100_STRUCT_MASK(1,RI),
	E100_STRUCT_MASK(1,DSR),
	E100_STRUCT_MASK(1,CD)
#else
	CONTROL_PINS_PORT_NOT_USED(1)
#endif
	},

	/* Ser 2 */
	{
#ifdef CONFIG_ETRAX_SERIAL_PORT2
	E100_STRUCT_PORT(2,DTR), E100_STRUCT_SHADOW(2,DTR),
	E100_STRUCT_PORT(2,RI),  E100_STRUCT_SHADOW(2,RI),
	E100_STRUCT_PORT(2,DSR), E100_STRUCT_SHADOW(2,DSR),
	E100_STRUCT_PORT(2,CD),  E100_STRUCT_SHADOW(2,CD),
	E100_STRUCT_MASK(2,DTR),
	E100_STRUCT_MASK(2,RI),
	E100_STRUCT_MASK(2,DSR),
	E100_STRUCT_MASK(2,CD)
#else
	CONTROL_PINS_PORT_NOT_USED(2)
#endif
	},

	/* Ser 3 */
	{
#ifdef CONFIG_ETRAX_SERIAL_PORT3
	E100_STRUCT_PORT(3,DTR), E100_STRUCT_SHADOW(3,DTR),
	E100_STRUCT_PORT(3,RI),  E100_STRUCT_SHADOW(3,RI),
	E100_STRUCT_PORT(3,DSR), E100_STRUCT_SHADOW(3,DSR),
	E100_STRUCT_PORT(3,CD),  E100_STRUCT_SHADOW(3,CD),
	E100_STRUCT_MASK(3,DTR),
	E100_STRUCT_MASK(3,RI),
	E100_STRUCT_MASK(3,DSR),
	E100_STRUCT_MASK(3,CD)
#else
	CONTROL_PINS_PORT_NOT_USED(3)
#endif
	}
};
#else  /* CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED */

/* All pins are on either PA or PB for each serial port */
#define CONTROL_PINS_PORT_NOT_USED(line) \
  &dummy_ser[line], &dummy_ser[line], \
  DUMMY_DTR_MASK, DUMMY_RI_MASK, DUMMY_DSR_MASK, DUMMY_CD_MASK


struct control_pins
{
	volatile unsigned char *port;
	unsigned char          *shadow;

	unsigned char dtr_mask;
	unsigned char ri_mask;
	unsigned char dsr_mask;
	unsigned char cd_mask;
};

#define dtr_port port
#define dtr_shadow shadow
#define ri_port port
#define ri_shadow shadow
#define dsr_port port
#define dsr_shadow shadow
#define cd_port port
#define cd_shadow shadow

static const struct control_pins e100_modem_pins[NR_PORTS] =
{
	/* Ser 0 */
	{
#ifdef CONFIG_ETRAX_SERIAL_PORT0
	E100_STRUCT_PORT(0,DTR), E100_STRUCT_SHADOW(0,DTR),
	E100_STRUCT_MASK(0,DTR),
	E100_STRUCT_MASK(0,RI),
	E100_STRUCT_MASK(0,DSR),
	E100_STRUCT_MASK(0,CD)
#else
	CONTROL_PINS_PORT_NOT_USED(0)
#endif
	},

	/* Ser 1 */
	{
#ifdef CONFIG_ETRAX_SERIAL_PORT1
	E100_STRUCT_PORT(1,DTR), E100_STRUCT_SHADOW(1,DTR),
	E100_STRUCT_MASK(1,DTR),
	E100_STRUCT_MASK(1,RI),
	E100_STRUCT_MASK(1,DSR),
	E100_STRUCT_MASK(1,CD)
#else
	CONTROL_PINS_PORT_NOT_USED(1)
#endif
	},

	/* Ser 2 */
	{
#ifdef CONFIG_ETRAX_SERIAL_PORT2
	E100_STRUCT_PORT(2,DTR), E100_STRUCT_SHADOW(2,DTR),
	E100_STRUCT_MASK(2,DTR),
	E100_STRUCT_MASK(2,RI),
	E100_STRUCT_MASK(2,DSR),
	E100_STRUCT_MASK(2,CD)
#else
	CONTROL_PINS_PORT_NOT_USED(2)
#endif
	},

	/* Ser 3 */
	{
#ifdef CONFIG_ETRAX_SERIAL_PORT3
	E100_STRUCT_PORT(3,DTR), E100_STRUCT_SHADOW(3,DTR),
	E100_STRUCT_MASK(3,DTR),
	E100_STRUCT_MASK(3,RI),
	E100_STRUCT_MASK(3,DSR),
	E100_STRUCT_MASK(3,CD)
#else
	CONTROL_PINS_PORT_NOT_USED(3)
#endif
	}
};
#endif /* !CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED */

#define E100_RTS_MASK 0x20
#define E100_CTS_MASK 0x40

/* All serial port signals are active low:
 * active   = 0 -> 3.3V to RS-232 driver -> -12V on RS-232 level
 * inactive = 1 -> 0V   to RS-232 driver -> +12V on RS-232 level
 *
 * These macros returns the pin value: 0=0V, >=1 = 3.3V on ETRAX chip
 */

/* Output */
#define E100_RTS_GET(info) ((info)->rx_ctrl & E100_RTS_MASK)
/* Input */
Alan Cox's avatar
Alan Cox committed
942
#define E100_CTS_GET(info) ((info)->ioport[REG_STATUS] & E100_CTS_MASK)
Linus Torvalds's avatar
Linus Torvalds committed
943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965

/* These are typically PA or PB and 0 means 0V, 1 means 3.3V */
/* Is an output */
#define E100_DTR_GET(info) ((*e100_modem_pins[(info)->line].dtr_shadow) & e100_modem_pins[(info)->line].dtr_mask)

/* Normally inputs */
#define E100_RI_GET(info) ((*e100_modem_pins[(info)->line].ri_port) & e100_modem_pins[(info)->line].ri_mask)
#define E100_CD_GET(info) ((*e100_modem_pins[(info)->line].cd_port) & e100_modem_pins[(info)->line].cd_mask)

/* Input */
#define E100_DSR_GET(info) ((*e100_modem_pins[(info)->line].dsr_port) & e100_modem_pins[(info)->line].dsr_mask)


/*
 * tmp_buf is used as a temporary buffer by serial_write.  We need to
 * lock it in case the memcpy_fromfs blocks while swapping in a page,
 * and some other program tries to do a serial write at the same time.
 * Since the lock will only come under contention when the system is
 * swapping and available memory is low, it makes sense to share one
 * buffer across all the serial ports, since it significantly saves
 * memory if large numbers of serial ports are open.
 */
static unsigned char *tmp_buf;
966
static DEFINE_MUTEX(tmp_buf_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
967 968 969 970

/* Calculate the chartime depending on baudrate, numbor of bits etc. */
static void update_char_time(struct e100_serial * info)
{
971
	tcflag_t cflags = info->port.tty->termios->c_cflag;
Linus Torvalds's avatar
Linus Torvalds committed
972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068
	int bits;

	/* calc. number of bits / data byte */
	/* databits + startbit and 1 stopbit */
	if ((cflags & CSIZE) == CS7)
		bits = 9;
	else
		bits = 10;

	if (cflags & CSTOPB)     /* 2 stopbits ? */
		bits++;

	if (cflags & PARENB)     /* parity bit ? */
		bits++;

	/* calc timeout */
	info->char_time_usec = ((bits * 1000000) / info->baud) + 1;
	info->flush_time_usec = 4*info->char_time_usec;
	if (info->flush_time_usec < MIN_FLUSH_TIME_USEC)
		info->flush_time_usec = MIN_FLUSH_TIME_USEC;

}

/*
 * This function maps from the Bxxxx defines in asm/termbits.h into real
 * baud rates.
 */

static int
cflag_to_baud(unsigned int cflag)
{
	static int baud_table[] = {
		0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400,
		4800, 9600, 19200, 38400 };

	static int ext_baud_table[] = {
		0, 57600, 115200, 230400, 460800, 921600, 1843200, 6250000,
                0, 0, 0, 0, 0, 0, 0, 0 };

	if (cflag & CBAUDEX)
		return ext_baud_table[(cflag & CBAUD) & ~CBAUDEX];
	else
		return baud_table[cflag & CBAUD];
}

/* and this maps to an etrax100 hardware baud constant */

static unsigned char
cflag_to_etrax_baud(unsigned int cflag)
{
	char retval;

	static char baud_table[] = {
		-1, -1, -1, -1, -1, -1, -1, 0, 1, 2, -1, 3, 4, 5, 6, 7 };

	static char ext_baud_table[] = {
		-1, 8, 9, 10, 11, 12, 13, 14, -1, -1, -1, -1, -1, -1, -1, -1 };

	if (cflag & CBAUDEX)
		retval = ext_baud_table[(cflag & CBAUD) & ~CBAUDEX];
	else
		retval = baud_table[cflag & CBAUD];

	if (retval < 0) {
		printk(KERN_WARNING "serdriver tried setting invalid baud rate, flags %x.\n", cflag);
		retval = 5; /* choose default 9600 instead */
	}

	return retval | (retval << 4); /* choose same for both TX and RX */
}


/* Various static support functions */

/* Functions to set or clear DTR/RTS on the requested line */
/* It is complicated by the fact that RTS is a serial port register, while
 * DTR might not be implemented in the HW at all, and if it is, it can be on
 * any general port.
 */


static inline void
e100_dtr(struct e100_serial *info, int set)
{
#ifndef CONFIG_SVINTO_SIM
	unsigned char mask = e100_modem_pins[info->line].dtr_mask;

#ifdef SERIAL_DEBUG_IO
	printk("ser%i dtr %i mask: 0x%02X\n", info->line, set, mask);
	printk("ser%i shadow before 0x%02X get: %i\n",
	       info->line, *e100_modem_pins[info->line].dtr_shadow,
	       E100_DTR_GET(info));
#endif
	/* DTR is active low */
	{
		unsigned long flags;

Jesper Nilsson's avatar
Jesper Nilsson committed
1069
		local_irq_save(flags);
Linus Torvalds's avatar
Linus Torvalds committed
1070 1071 1072
		*e100_modem_pins[info->line].dtr_shadow &= ~mask;
		*e100_modem_pins[info->line].dtr_shadow |= (set ? 0 : mask);
		*e100_modem_pins[info->line].dtr_port = *e100_modem_pins[info->line].dtr_shadow;
Jesper Nilsson's avatar
Jesper Nilsson committed
1073
		local_irq_restore(flags);
Linus Torvalds's avatar
Linus Torvalds committed
1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091
	}

#ifdef SERIAL_DEBUG_IO
	printk("ser%i shadow after 0x%02X get: %i\n",
	       info->line, *e100_modem_pins[info->line].dtr_shadow,
	       E100_DTR_GET(info));
#endif
#endif
}

/* set = 0 means 3.3V on the pin, bitvalue: 0=active, 1=inactive
 *                                          0=0V    , 1=3.3V
 */
static inline void
e100_rts(struct e100_serial *info, int set)
{
#ifndef CONFIG_SVINTO_SIM
	unsigned long flags;
Jesper Nilsson's avatar
Jesper Nilsson committed
1092
	local_irq_save(flags);
Linus Torvalds's avatar
Linus Torvalds committed
1093 1094
	info->rx_ctrl &= ~E100_RTS_MASK;
	info->rx_ctrl |= (set ? 0 : E100_RTS_MASK);  /* RTS is active low */
Alan Cox's avatar
Alan Cox committed
1095
	info->ioport[REG_REC_CTRL] = info->rx_ctrl;
Jesper Nilsson's avatar
Jesper Nilsson committed
1096
	local_irq_restore(flags);
Linus Torvalds's avatar
Linus Torvalds committed
1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113
#ifdef SERIAL_DEBUG_IO
	printk("ser%i rts %i\n", info->line, set);
#endif
#endif
}


/* If this behaves as a modem, RI and CD is an output */
static inline void
e100_ri_out(struct e100_serial *info, int set)
{
#ifndef CONFIG_SVINTO_SIM
	/* RI is active low */
	{
		unsigned char mask = e100_modem_pins[info->line].ri_mask;
		unsigned long flags;

Jesper Nilsson's avatar
Jesper Nilsson committed
1114
		local_irq_save(flags);
Linus Torvalds's avatar
Linus Torvalds committed
1115 1116 1117
		*e100_modem_pins[info->line].ri_shadow &= ~mask;
		*e100_modem_pins[info->line].ri_shadow |= (set ? 0 : mask);
		*e100_modem_pins[info->line].ri_port = *e100_modem_pins[info->line].ri_shadow;
Jesper Nilsson's avatar
Jesper Nilsson committed
1118
		local_irq_restore(flags);
Linus Torvalds's avatar
Linus Torvalds committed
1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130
	}
#endif
}
static inline void
e100_cd_out(struct e100_serial *info, int set)
{
#ifndef CONFIG_SVINTO_SIM
	/* CD is active low */
	{
		unsigned char mask = e100_modem_pins[info->line].cd_mask;
		unsigned long flags;

Jesper Nilsson's avatar
Jesper Nilsson committed
1131
		local_irq_save(flags);
Linus Torvalds's avatar
Linus Torvalds committed
1132 1133 1134
		*e100_modem_pins[info->line].cd_shadow &= ~mask;
		*e100_modem_pins[info->line].cd_shadow |= (set ? 0 : mask);
		*e100_modem_pins[info->line].cd_port = *e100_modem_pins[info->line].cd_shadow;
Jesper Nilsson's avatar
Jesper Nilsson committed
1135
		local_irq_restore(flags);
Linus Torvalds's avatar
Linus Torvalds committed
1136 1137 1138 1139 1140 1141 1142 1143 1144
	}
#endif
}

static inline void
e100_disable_rx(struct e100_serial *info)
{
#ifndef CONFIG_SVINTO_SIM
	/* disable the receiver */
Alan Cox's avatar
Alan Cox committed
1145
	info->ioport[REG_REC_CTRL] =
Linus Torvalds's avatar
Linus Torvalds committed
1146 1147 1148 1149 1150 1151 1152 1153 1154
		(info->rx_ctrl &= ~IO_MASK(R_SERIAL0_REC_CTRL, rec_enable));
#endif
}

static inline void
e100_enable_rx(struct e100_serial *info)
{
#ifndef CONFIG_SVINTO_SIM
	/* enable the receiver */
Alan Cox's avatar
Alan Cox committed
1155
	info->ioport[REG_REC_CTRL] =
Linus Torvalds's avatar
Linus Torvalds committed
1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183
		(info->rx_ctrl |= IO_MASK(R_SERIAL0_REC_CTRL, rec_enable));
#endif
}

/* the rx DMA uses both the dma_descr and the dma_eop interrupts */

static inline void
e100_disable_rxdma_irq(struct e100_serial *info)
{
#ifdef SERIAL_DEBUG_INTR
	printk("rxdma_irq(%d): 0\n",info->line);
#endif
	DINTR1(DEBUG_LOG(info->line,"IRQ disable_rxdma_irq %i\n", info->line));
	*R_IRQ_MASK2_CLR = (info->irq << 2) | (info->irq << 3);
}

static inline void
e100_enable_rxdma_irq(struct e100_serial *info)
{
#ifdef SERIAL_DEBUG_INTR
	printk("rxdma_irq(%d): 1\n",info->line);
#endif
	DINTR1(DEBUG_LOG(info->line,"IRQ enable_rxdma_irq %i\n", info->line));
	*R_IRQ_MASK2_SET = (info->irq << 2) | (info->irq << 3);
}

/* the tx DMA uses only dma_descr interrupt */

Adrian Bunk's avatar
Adrian Bunk committed
1184
static void e100_disable_txdma_irq(struct e100_serial *info)
Linus Torvalds's avatar
Linus Torvalds committed
1185 1186 1187 1188 1189 1190 1191 1192
{
#ifdef SERIAL_DEBUG_INTR
	printk("txdma_irq(%d): 0\n",info->line);
#endif
	DINTR1(DEBUG_LOG(info->line,"IRQ disable_txdma_irq %i\n", info->line));
	*R_IRQ_MASK2_CLR = info->irq;
}

Adrian Bunk's avatar
Adrian Bunk committed
1193
static void e100_enable_txdma_irq(struct e100_serial *info)
Linus Torvalds's avatar
Linus Torvalds committed
1194 1195 1196 1197 1198 1199 1200 1201
{
#ifdef SERIAL_DEBUG_INTR
	printk("txdma_irq(%d): 1\n",info->line);
#endif
	DINTR1(DEBUG_LOG(info->line,"IRQ enable_txdma_irq %i\n", info->line));
	*R_IRQ_MASK2_SET = info->irq;
}

Adrian Bunk's avatar
Adrian Bunk committed
1202
static void e100_disable_txdma_channel(struct e100_serial *info)
Linus Torvalds's avatar
Linus Torvalds committed
1203 1204 1205 1206
{
	unsigned long flags;

	/* Disable output DMA channel for the serial port in question
1207
	 * ( set to something other than serialX)
Linus Torvalds's avatar
Linus Torvalds committed
1208
	 */
Jesper Nilsson's avatar
Jesper Nilsson committed
1209
	local_irq_save(flags);
Linus Torvalds's avatar
Linus Torvalds committed
1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236
	DFLOW(DEBUG_LOG(info->line, "disable_txdma_channel %i\n", info->line));
	if (info->line == 0) {
		if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma6)) ==
		    IO_STATE(R_GEN_CONFIG, dma6, serial0)) {
			genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma6);
			genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma6, unused);
		}
	} else if (info->line == 1) {
		if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma8)) ==
		    IO_STATE(R_GEN_CONFIG, dma8, serial1)) {
			genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma8);
			genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma8, usb);
		}
	} else if (info->line == 2) {
		if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma2)) ==
		    IO_STATE(R_GEN_CONFIG, dma2, serial2)) {
			genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma2);
			genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma2, par0);
		}
	} else if (info->line == 3) {
		if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma4)) ==
		    IO_STATE(R_GEN_CONFIG, dma4, serial3)) {
			genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma4);
			genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma4, par1);
		}
	}
	*R_GEN_CONFIG = genconfig_shadow;
Jesper Nilsson's avatar
Jesper Nilsson committed
1237
	local_irq_restore(flags);
Linus Torvalds's avatar
Linus Torvalds committed
1238 1239 1240
}


Adrian Bunk's avatar
Adrian Bunk committed
1241
static void e100_enable_txdma_channel(struct e100_serial *info)
Linus Torvalds's avatar
Linus Torvalds committed
1242 1243 1244
{
	unsigned long flags;

Jesper Nilsson's avatar
Jesper Nilsson committed
1245
	local_irq_save(flags);
Linus Torvalds's avatar
Linus Torvalds committed
1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261
	DFLOW(DEBUG_LOG(info->line, "enable_txdma_channel %i\n", info->line));
	/* Enable output DMA channel for the serial port in question */
	if (info->line == 0) {
		genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma6);
		genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma6, serial0);
	} else if (info->line == 1) {
		genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma8);
		genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma8, serial1);
	} else if (info->line == 2) {
		genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma2);
		genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma2, serial2);
	} else if (info->line == 3) {
		genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma4);
		genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma4, serial3);
	}
	*R_GEN_CONFIG = genconfig_shadow;
Jesper Nilsson's avatar
Jesper Nilsson committed
1262
	local_irq_restore(flags);
Linus Torvalds's avatar
Linus Torvalds committed
1263 1264
}

Adrian Bunk's avatar
Adrian Bunk committed
1265
static void e100_disable_rxdma_channel(struct e100_serial *info)
Linus Torvalds's avatar
Linus Torvalds committed
1266 1267 1268 1269
{
	unsigned long flags;

	/* Disable input DMA channel for the serial port in question
1270
	 * ( set to something other than serialX)
Linus Torvalds's avatar
Linus Torvalds committed
1271
	 */
Jesper Nilsson's avatar
Jesper Nilsson committed
1272
	local_irq_save(flags);
Linus Torvalds's avatar
Linus Torvalds committed
1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298
	if (info->line == 0) {
		if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma7)) ==
		    IO_STATE(R_GEN_CONFIG, dma7, serial0)) {
			genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma7);
			genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma7, unused);
		}
	} else if (info->line == 1) {
		if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma9)) ==
		    IO_STATE(R_GEN_CONFIG, dma9, serial1)) {
			genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma9);
			genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma9, usb);
		}
	} else if (info->line == 2) {
		if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma3)) ==
		    IO_STATE(R_GEN_CONFIG, dma3, serial2)) {
			genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma3);
			genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma3, par0);
		}
	} else if (info->line == 3) {
		if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma5)) ==
		    IO_STATE(R_GEN_CONFIG, dma5, serial3)) {
			genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma5);
			genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma5, par1);
		}
	}
	*R_GEN_CONFIG = genconfig_shadow;
Jesper Nilsson's avatar
Jesper Nilsson committed
1299
	local_irq_restore(flags);
Linus Torvalds's avatar
Linus Torvalds committed
1300 1301 1302
}


Adrian Bunk's avatar
Adrian Bunk committed
1303
static void e100_enable_rxdma_channel(struct e100_serial *info)
Linus Torvalds's avatar
Linus Torvalds committed
1304 1305 1306
{
	unsigned long flags;

Jesper Nilsson's avatar
Jesper Nilsson committed
1307
	local_irq_save(flags);
Linus Torvalds's avatar
Linus Torvalds committed
1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322
	/* Enable input DMA channel for the serial port in question */
	if (info->line == 0) {
		genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma7);
		genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma7, serial0);
	} else if (info->line == 1) {
		genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma9);
		genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma9, serial1);
	} else if (info->line == 2) {
		genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma3);
		genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma3, serial2);
	} else if (info->line == 3) {
		genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma5);
		genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma5, serial3);
	}
	*R_GEN_CONFIG = genconfig_shadow;
Jesper Nilsson's avatar
Jesper Nilsson committed
1323
	local_irq_restore(flags);
Linus Torvalds's avatar
Linus Torvalds committed
1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394
}

#ifdef SERIAL_HANDLE_EARLY_ERRORS
/* in order to detect and fix errors on the first byte
   we have to use the serial interrupts as well. */

static inline void
e100_disable_serial_data_irq(struct e100_serial *info)
{
#ifdef SERIAL_DEBUG_INTR
	printk("ser_irq(%d): 0\n",info->line);
#endif
	DINTR1(DEBUG_LOG(info->line,"IRQ disable data_irq %i\n", info->line));
	*R_IRQ_MASK1_CLR = (1U << (8+2*info->line));
}

static inline void
e100_enable_serial_data_irq(struct e100_serial *info)
{
#ifdef SERIAL_DEBUG_INTR
	printk("ser_irq(%d): 1\n",info->line);
	printk("**** %d = %d\n",
	       (8+2*info->line),
	       (1U << (8+2*info->line)));
#endif
	DINTR1(DEBUG_LOG(info->line,"IRQ enable data_irq %i\n", info->line));
	*R_IRQ_MASK1_SET = (1U << (8+2*info->line));
}
#endif

static inline void
e100_disable_serial_tx_ready_irq(struct e100_serial *info)
{
#ifdef SERIAL_DEBUG_INTR
	printk("ser_tx_irq(%d): 0\n",info->line);
#endif
	DINTR1(DEBUG_LOG(info->line,"IRQ disable ready_irq %i\n", info->line));
	*R_IRQ_MASK1_CLR = (1U << (8+1+2*info->line));
}

static inline void
e100_enable_serial_tx_ready_irq(struct e100_serial *info)
{
#ifdef SERIAL_DEBUG_INTR
	printk("ser_tx_irq(%d): 1\n",info->line);
	printk("**** %d = %d\n",
	       (8+1+2*info->line),
	       (1U << (8+1+2*info->line)));
#endif
	DINTR2(DEBUG_LOG(info->line,"IRQ enable ready_irq %i\n", info->line));
	*R_IRQ_MASK1_SET = (1U << (8+1+2*info->line));
}

static inline void e100_enable_rx_irq(struct e100_serial *info)
{
	if (info->uses_dma_in)
		e100_enable_rxdma_irq(info);
	else
		e100_enable_serial_data_irq(info);
}
static inline void e100_disable_rx_irq(struct e100_serial *info)
{
	if (info->uses_dma_in)
		e100_disable_rxdma_irq(info);
	else
		e100_disable_serial_data_irq(info);
}

#if defined(CONFIG_ETRAX_RS485)
/* Enable RS-485 mode on selected port. This is UGLY. */
static int
1395
e100_enable_rs485(struct tty_struct *tty, struct serial_rs485 *r)
Linus Torvalds's avatar
Linus Torvalds committed
1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412
{
	struct e100_serial * info = (struct e100_serial *)tty->driver_data;

#if defined(CONFIG_ETRAX_RS485_ON_PA)
	*R_PORT_PA_DATA = port_pa_data_shadow |= (1 << rs485_pa_bit);
#endif
#if defined(CONFIG_ETRAX_RS485_ON_PORT_G)
	REG_SHADOW_SET(R_PORT_G_DATA,  port_g_data_shadow,
		       rs485_port_g_bit, 1);
#endif
#if defined(CONFIG_ETRAX_RS485_LTC1387)
	REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow,
		       CONFIG_ETRAX_RS485_LTC1387_DXEN_PORT_G_BIT, 1);
	REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow,
		       CONFIG_ETRAX_RS485_LTC1387_RXEN_PORT_G_BIT, 1);
#endif

1413 1414 1415 1416
	info->rs485 = *r;

	/* Maximum delay before RTS equal to 1000 */
	if (info->rs485.delay_rts_before_send >= 1000)
Linus Torvalds's avatar
Linus Torvalds committed
1417
		info->rs485.delay_rts_before_send = 1000;
1418

Linus Torvalds's avatar
Linus Torvalds committed
1419 1420 1421 1422 1423 1424 1425 1426 1427 1428
/*	printk("rts: on send = %i, after = %i, enabled = %i",
		    info->rs485.rts_on_send,
		    info->rs485.rts_after_sent,
		    info->rs485.enabled
	);
*/
	return 0;
}

static int
Jesper Nilsson's avatar
Jesper Nilsson committed
1429
e100_write_rs485(struct tty_struct *tty,
Linus Torvalds's avatar
Linus Torvalds committed
1430 1431 1432
                 const unsigned char *buf, int count)
{
	struct e100_serial * info = (struct e100_serial *)tty->driver_data;
1433
	int old_value = (info->rs485.flags) & SER_RS485_ENABLED;
Linus Torvalds's avatar
Linus Torvalds committed
1434 1435

	/* rs485 is always implicitly enabled if we're using the ioctl()
1436
	 * but it doesn't have to be set in the serial_rs485
Linus Torvalds's avatar
Linus Torvalds committed
1437 1438 1439
	 * (to be backward compatible with old apps)
	 * So we store, set and restore it.
	 */
1440
	info->rs485.flags |= SER_RS485_ENABLED;
Linus Torvalds's avatar
Linus Torvalds committed
1441
	/* rs_write now deals with RS485 if enabled */
Jesper Nilsson's avatar
Jesper Nilsson committed
1442
	count = rs_write(tty, buf, count);
1443 1444
	if (!old_value)
		info->rs485.flags &= ~(SER_RS485_ENABLED);
Linus Torvalds's avatar
Linus Torvalds committed
1445 1446 1447 1448 1449 1450 1451 1452 1453 1454
	return count;
}

#ifdef CONFIG_ETRAX_FAST_TIMER
/* Timer function to toggle RTS when using FAST_TIMER */
static void rs485_toggle_rts_timer_function(unsigned long data)
{
	struct e100_serial *info = (struct e100_serial *)data;

	fast_timers_rs485[info->line].function = NULL;
1455
	e100_rts(info, (info->rs485.flags & SER_RS485_RTS_AFTER_SEND));
Linus Torvalds's avatar
Linus Torvalds committed
1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480
#if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER)
	e100_enable_rx(info);
	e100_enable_rx_irq(info);
#endif
}
#endif
#endif /* CONFIG_ETRAX_RS485 */

/*
 * ------------------------------------------------------------
 * rs_stop() and rs_start()
 *
 * This routines are called before setting or resetting tty->stopped.
 * They enable or disable transmitter using the XOFF registers, as necessary.
 * ------------------------------------------------------------
 */

static void
rs_stop(struct tty_struct *tty)
{
	struct e100_serial *info = (struct e100_serial *)tty->driver_data;
	if (info) {
		unsigned long flags;
		unsigned long xoff;

Jesper Nilsson's avatar
Jesper Nilsson committed
1481
		local_irq_save(flags);
Linus Torvalds's avatar
Linus Torvalds committed
1482 1483 1484 1485
		DFLOW(DEBUG_LOG(info->line, "XOFF rs_stop xmit %i\n",
				CIRC_CNT(info->xmit.head,
					 info->xmit.tail,SERIAL_XMIT_SIZE)));

1486 1487
		xoff = IO_FIELD(R_SERIAL0_XOFF, xoff_char,
				STOP_CHAR(info->port.tty));
Linus Torvalds's avatar
Linus Torvalds committed
1488 1489 1490 1491 1492
		xoff |= IO_STATE(R_SERIAL0_XOFF, tx_stop, stop);
		if (tty->termios->c_iflag & IXON ) {
			xoff |= IO_STATE(R_SERIAL0_XOFF, auto_xoff, enable);
		}

Alan Cox's avatar
Alan Cox committed
1493
		*((unsigned long *)&info->ioport[REG_XOFF]) = xoff;
Jesper Nilsson's avatar
Jesper Nilsson committed
1494
		local_irq_restore(flags);
Linus Torvalds's avatar
Linus Torvalds committed
1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505
	}
}

static void
rs_start(struct tty_struct *tty)
{
	struct e100_serial *info = (struct e100_serial *)tty->driver_data;
	if (info) {
		unsigned long flags;
		unsigned long xoff;

Jesper Nilsson's avatar
Jesper Nilsson committed
1506
		local_irq_save(flags);
Linus Torvalds's avatar
Linus Torvalds committed
1507 1508 1509 1510 1511 1512 1513 1514 1515
		DFLOW(DEBUG_LOG(info->line, "XOFF rs_start xmit %i\n",
				CIRC_CNT(info->xmit.head,
					 info->xmit.tail,SERIAL_XMIT_SIZE)));
		xoff = IO_FIELD(R_SERIAL0_XOFF, xoff_char, STOP_CHAR(tty));
		xoff |= IO_STATE(R_SERIAL0_XOFF, tx_stop, enable);
		if (tty->termios->c_iflag & IXON ) {
			xoff |= IO_STATE(R_SERIAL0_XOFF, auto_xoff, enable);
		}

Alan Cox's avatar
Alan Cox committed
1516
		*((unsigned long *)&info->ioport[REG_XOFF]) = xoff;
Linus Torvalds's avatar
Linus Torvalds committed
1517 1518 1519 1520
		if (!info->uses_dma_out &&
		    info->xmit.head != info->xmit.tail && info->xmit.buf)
			e100_enable_serial_tx_ready_irq(info);

Jesper Nilsson's avatar
Jesper Nilsson committed
1521
		local_irq_restore(flags);
Linus Torvalds's avatar
Linus Torvalds committed
1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549
	}
}

/*
 * ----------------------------------------------------------------------
 *
 * Here starts the interrupt handling routines.  All of the following
 * subroutines are declared as inline and are folded into
 * rs_interrupt().  They were separated out for readability's sake.
 *
 * Note: rs_interrupt() is a "fast" interrupt, which means that it
 * runs with interrupts turned off.  People who may want to modify
 * rs_interrupt() should try to keep the interrupt handler as fast as
 * possible.  After you are done making modifications, it is not a bad
 * idea to do:
 *
 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
 *
 * and look at the resulting assemble code in serial.s.
 *
 * 				- Ted Ts'o (tytso@mit.edu), 7-Mar-93
 * -----------------------------------------------------------------------
 */

/*
 * This routine is used by the interrupt handler to schedule
 * processing in the software interrupt portion of the driver.
 */
Adrian Bunk's avatar
Adrian Bunk committed
1550
static void rs_sched_event(struct e100_serial *info, int event)
Linus Torvalds's avatar
Linus Torvalds committed
1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650
{
	if (info->event & (1 << event))
		return;
	info->event |= 1 << event;
	schedule_work(&info->work);
}

/* The output DMA channel is free - use it to send as many chars as possible
 * NOTES:
 *   We don't pay attention to info->x_char, which means if the TTY wants to
 *   use XON/XOFF it will set info->x_char but we won't send any X char!
 *
 *   To implement this, we'd just start a DMA send of 1 byte pointing at a
 *   buffer containing the X char, and skip updating xmit. We'd also have to
 *   check if the last sent char was the X char when we enter this function
 *   the next time, to avoid updating xmit with the sent X value.
 */

static void
transmit_chars_dma(struct e100_serial *info)
{
	unsigned int c, sentl;
	struct etrax_dma_descr *descr;

#ifdef CONFIG_SVINTO_SIM
	/* This will output too little if tail is not 0 always since
	 * we don't reloop to send the other part. Anyway this SHOULD be a
	 * no-op - transmit_chars_dma would never really be called during sim
	 * since rs_write does not write into the xmit buffer then.
	 */
	if (info->xmit.tail)
		printk("Error in serial.c:transmit_chars-dma(), tail!=0\n");
	if (info->xmit.head != info->xmit.tail) {
		SIMCOUT(info->xmit.buf + info->xmit.tail,
			CIRC_CNT(info->xmit.head,
				 info->xmit.tail,
				 SERIAL_XMIT_SIZE));
		info->xmit.head = info->xmit.tail;  /* move back head */
		info->tr_running = 0;
	}
	return;
#endif
	/* acknowledge both dma_descr and dma_eop irq in R_DMA_CHx_CLR_INTR */
	*info->oclrintradr =
		IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) |
		IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do);

#ifdef SERIAL_DEBUG_INTR
	if (info->line == SERIAL_DEBUG_LINE)
		printk("tc\n");
#endif
	if (!info->tr_running) {
		/* weirdo... we shouldn't get here! */
		printk(KERN_WARNING "Achtung: transmit_chars_dma with !tr_running\n");
		return;
	}

	descr = &info->tr_descr;

	/* first get the amount of bytes sent during the last DMA transfer,
	   and update xmit accordingly */

	/* if the stop bit was not set, all data has been sent */
	if (!(descr->status & d_stop)) {
		sentl = descr->sw_len;
	} else
		/* otherwise we find the amount of data sent here */
		sentl = descr->hw_len;

	DFLOW(DEBUG_LOG(info->line, "TX %i done\n", sentl));

	/* update stats */
	info->icount.tx += sentl;

	/* update xmit buffer */
	info->xmit.tail = (info->xmit.tail + sentl) & (SERIAL_XMIT_SIZE - 1);

	/* if there is only a few chars left in the buf, wake up the blocked
	   write if any */
	if (CIRC_CNT(info->xmit.head,
		     info->xmit.tail,
		     SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
		rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);

	/* find out the largest amount of consecutive bytes we want to send now */

	c = CIRC_CNT_TO_END(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);

	/* Don't send all in one DMA transfer - divide it so we wake up
	 * application before all is sent
	 */

	if (c >= 4*WAKEUP_CHARS)
		c = c/2;

	if (c <= 0) {
		/* our job here is done, don't schedule any new DMA transfer */
		info->tr_running = 0;

#if defined(CONFIG_ETRAX_RS485) && defined(CONFIG_ETRAX_FAST_TIMER)
1651
		if (info->rs485.flags & SER_RS485_ENABLED) {
Linus Torvalds's avatar
Linus Torvalds committed
1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700
			/* Set a short timer to toggle RTS */
			start_one_shot_timer(&fast_timers_rs485[info->line],
			                     rs485_toggle_rts_timer_function,
			                     (unsigned long)info,
			                     info->char_time_usec*2,
			                     "RS-485");
		}
#endif /* RS485 */
		return;
	}

	/* ok we can schedule a dma send of c chars starting at info->xmit.tail */
	/* set up the descriptor correctly for output */
	DFLOW(DEBUG_LOG(info->line, "TX %i\n", c));
	descr->ctrl = d_int | d_eol | d_wait; /* Wait needed for tty_wait_until_sent() */
	descr->sw_len = c;
	descr->buf = virt_to_phys(info->xmit.buf + info->xmit.tail);
	descr->status = 0;

	*info->ofirstadr = virt_to_phys(descr); /* write to R_DMAx_FIRST */
	*info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, start);

	/* DMA is now running (hopefully) */
} /* transmit_chars_dma */

static void
start_transmit(struct e100_serial *info)
{
#if 0
	if (info->line == SERIAL_DEBUG_LINE)
		printk("x\n");
#endif

	info->tr_descr.sw_len = 0;
	info->tr_descr.hw_len = 0;
	info->tr_descr.status = 0;
	info->tr_running = 1;
	if (info->uses_dma_out)
		transmit_chars_dma(info);
	else
		e100_enable_serial_tx_ready_irq(info);
} /* start_transmit */

#ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER
static int serial_fast_timer_started = 0;
static int serial_fast_timer_expired = 0;
static void flush_timeout_function(unsigned long data);
#define START_FLUSH_FAST_TIMER_TIME(info, string, usec) {\
  unsigned long timer_flags; \
Jesper Nilsson's avatar
Jesper Nilsson committed
1701
  local_irq_save(timer_flags); \
Linus Torvalds's avatar
Linus Torvalds committed
1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714
  if (fast_timers[info->line].function == NULL) { \
    serial_fast_timer_started++; \
    TIMERD(DEBUG_LOG(info->line, "start_timer %i ", info->line)); \
    TIMERD(DEBUG_LOG(info->line, "num started: %i\n", serial_fast_timer_started)); \
    start_one_shot_timer(&fast_timers[info->line], \
                         flush_timeout_function, \
                         (unsigned long)info, \
                         (usec), \
                         string); \
  } \
  else { \
    TIMERD(DEBUG_LOG(info->line, "timer %i already running\n", info->line)); \
  } \
Jesper Nilsson's avatar
Jesper Nilsson committed
1715
  local_irq_restore(timer_flags); \
Linus Torvalds's avatar
Linus Torvalds committed
1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743
}
#define START_FLUSH_FAST_TIMER(info, string) START_FLUSH_FAST_TIMER_TIME(info, string, info->flush_time_usec)

#else
#define START_FLUSH_FAST_TIMER_TIME(info, string, usec)
#define START_FLUSH_FAST_TIMER(info, string)
#endif

static struct etrax_recv_buffer *
alloc_recv_buffer(unsigned int size)
{
	struct etrax_recv_buffer *buffer;

	if (!(buffer = kmalloc(sizeof *buffer + size, GFP_ATOMIC)))
		return NULL;

	buffer->next = NULL;
	buffer->length = 0;
	buffer->error = TTY_NORMAL;

	return buffer;
}

static void
append_recv_buffer(struct e100_serial *info, struct etrax_recv_buffer *buffer)
{
	unsigned long flags;

Jesper Nilsson's avatar
Jesper Nilsson committed
1744
	local_irq_save(flags);
Linus Torvalds's avatar
Linus Torvalds committed
1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756

	if (!info->first_recv_buffer)
		info->first_recv_buffer = buffer;
	else
		info->last_recv_buffer->next = buffer;

	info->last_recv_buffer = buffer;

	info->recv_cnt += buffer->length;
	if (info->recv_cnt > info->max_recv_cnt)
		info->max_recv_cnt = info->recv_cnt;

Jesper Nilsson's avatar
Jesper Nilsson committed
1757
	local_irq_restore(flags);
Linus Torvalds's avatar
Linus Torvalds committed
1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775
}

static int
add_char_and_flag(struct e100_serial *info, unsigned char data, unsigned char flag)
{
	struct etrax_recv_buffer *buffer;
	if (info->uses_dma_in) {
		if (!(buffer = alloc_recv_buffer(4)))
			return 0;

		buffer->length = 1;
		buffer->error = flag;
		buffer->buffer[0] = data;

		append_recv_buffer(info, buffer);

		info->icount.rx++;
	} else {
1776
		struct tty_struct *tty = info->port.tty;
Jesper Nilsson's avatar
Jesper Nilsson committed
1777
		tty_insert_flip_char(tty, data, flag);
Linus Torvalds's avatar
Linus Torvalds committed
1778 1779 1780 1781 1782 1783
		info->icount.rx++;
	}

	return 1;
}

Adrian Bunk's avatar
Adrian Bunk committed
1784 1785 1786
static unsigned int handle_descr_data(struct e100_serial *info,
				      struct etrax_dma_descr *descr,
				      unsigned int recvl)
Linus Torvalds's avatar
Linus Torvalds committed
1787 1788 1789 1790 1791
{
	struct etrax_recv_buffer *buffer = phys_to_virt(descr->buf) - sizeof *buffer;

	if (info->recv_cnt + recvl > 65536) {
		printk(KERN_CRIT
1792
		       "%s: Too much pending incoming serial data! Dropping %u bytes.\n", __func__, recvl);
Linus Torvalds's avatar
Linus Torvalds committed
1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804
		return 0;
	}

	buffer->length = recvl;

	if (info->errorcode == ERRCODE_SET_BREAK)
		buffer->error = TTY_BREAK;
	info->errorcode = 0;

	append_recv_buffer(info, buffer);

	if (!(buffer = alloc_recv_buffer(SERIAL_DESCR_BUF_SIZE)))
1805
		panic("%s: Failed to allocate memory for receive buffer!\n", __func__);
Linus Torvalds's avatar
Linus Torvalds committed
1806 1807 1808 1809 1810 1811

	descr->buf = virt_to_phys(buffer->buffer);

	return recvl;
}

Adrian Bunk's avatar
Adrian Bunk committed
1812
static unsigned int handle_all_descr_data(struct e100_serial *info)
Linus Torvalds's avatar
Linus Torvalds committed
1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841
{
	struct etrax_dma_descr *descr;
	unsigned int recvl;
	unsigned int ret = 0;

	while (1)
	{
		descr = &info->rec_descr[info->cur_rec_descr];

		if (descr == phys_to_virt(*info->idescradr))
			break;

		if (++info->cur_rec_descr == SERIAL_RECV_DESCRIPTORS)
			info->cur_rec_descr = 0;

		/* find out how many bytes were read */

		/* if the eop bit was not set, all data has been received */
		if (!(descr->status & d_eop)) {
			recvl = descr->sw_len;
		} else {
			/* otherwise we find the amount of data received here */
			recvl = descr->hw_len;
		}

		/* Reset the status information */
		descr->status = 0;

		DFLOW(  DEBUG_LOG(info->line, "RX %lu\n", recvl);
1842
			if (info->port.tty->stopped) {
Linus Torvalds's avatar
Linus Torvalds committed
1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858
				unsigned char *buf = phys_to_virt(descr->buf);
				DEBUG_LOG(info->line, "rx 0x%02X\n", buf[0]);
				DEBUG_LOG(info->line, "rx 0x%02X\n", buf[1]);
				DEBUG_LOG(info->line, "rx 0x%02X\n", buf[2]);
			}
			);

		/* update stats */
		info->icount.rx += recvl;

		ret += handle_descr_data(info, descr, recvl);
	}

	return ret;
}

Adrian Bunk's avatar
Adrian Bunk committed
1859
static void receive_chars_dma(struct e100_serial *info)
Linus Torvalds's avatar
Linus Torvalds committed
1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875
{
	struct tty_struct *tty;
	unsigned char rstat;

#ifdef CONFIG_SVINTO_SIM
	/* No receive in the simulator.  Will probably be when the rest of
	 * the serial interface works, and this piece will just be removed.
	 */
	return;
#endif

	/* Acknowledge both dma_descr and dma_eop irq in R_DMA_CHx_CLR_INTR */
	*info->iclrintradr =
		IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) |
		IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do);

1876
	tty = info->port.tty;
Linus Torvalds's avatar
Linus Torvalds committed
1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890
	if (!tty) /* Something wrong... */
		return;

#ifdef SERIAL_HANDLE_EARLY_ERRORS
	if (info->uses_dma_in)
		e100_enable_serial_data_irq(info);
#endif

	if (info->errorcode == ERRCODE_INSERT_BREAK)
		add_char_and_flag(info, '\0', TTY_BREAK);

	handle_all_descr_data(info);

	/* Read the status register to detect errors */