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Subversion Repositories openrisc_2011-10-31

[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libbsp/] [m68k/] [gen68360/] [console/] [console.c] - Blame information for rev 493

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1 30 unneback 
/*
2 
 *  SMC1 raw console serial I/O.
3 
 *
4 
 *  This driver is an example of `POLLING' or `INTERRUPT' I/O.
5 
 *
6 
 *  To run with interrupt-driven I/O, ensure m360_smc1_interrupt
7 
 *  is set before calling the initialization routine.
8 
 *
9 
 *  Author:
10 
 *    W. Eric Norum
11 
 *    Saskatchewan Accelerator Laboratory
12 
 *    University of Saskatchewan
13 
 *    Saskatoon, Saskatchewan, CANADA
14 
 *    eric@skatter.usask.ca
15 
 *
16 
 *  COPYRIGHT (c) 1989-1999.
17 
 *  On-Line Applications Research Corporation (OAR).
18 
 *
19 
 *  The license and distribution terms for this file may be
20 
 *  found in the file LICENSE in this distribution or at
21 
 *
22 
 *  http://www.OARcorp.com/rtems/license.html.
23 
 *
24 
 *  $Id: console.c,v 1.2 2001-09-27 12:00:08 chris Exp $
25 
 */
26 
 
27 
#include <termios.h>
28 
#include <bsp.h>
29 
#include <rtems/libio.h>
30 
#include "m68360.h"
31 
 
32 
/*
33 
 * Declare clock speed -- may be overwritten by downloader or debugger
34 
 */
35 
int m360_clock_rate     = 25000000;
36 
 
37 
/*
38 
 * Interrupt-driven input buffer
39 
 * Declare console baud rate -- may also be overwritten
40 
 */
41 
int console_baud_rate = 9600;
42 
 
43 
/*
44 
 */
45 
#define RXBUFSIZE       16
46 
 
47 
/*
48 
 * Interrupt-driven callback
49 
 */
50 
static int m360_smc1_interrupt = 1;
51 
static void *smc1ttyp;
52 
 
53 
/*
54 
 * I/O buffers and pointers to buffer descriptors
55 
 */
56 
static volatile char rxBuf[RXBUFSIZE];
57 
static volatile m360BufferDescriptor_t *smcRxBd, *smcTxBd;
58 
 
59 
/*
60 
 * Device-specific routines
61 
 */
62 
 
63 
/*
64 
 * Compute baud-rate-generator configuration register value
65 
 */
66 
static int
67 
smc1BRGC (int baud)
68 
{
69 
        int divisor;
70 
        int div16 = 0;
71 
 
72 
        divisor = ((m360_clock_rate / 16) + (baud / 2)) / baud;
73 
        if (divisor > 4096) {
74 
                div16 = 1;
75 
                divisor = (divisor + 8) / 16;
76 
        }
77 
        return M360_BRG_EN | M360_BRG_EXTC_BRGCLK | ((divisor - 1) << 1) | div16;
78 
}
79 
 
80 
/*
81 
 * Hardware-dependent portion of tcsetattr().
82 
 */
83 
static int
84 
smc1SetAttributes (int minor, const struct termios *t)
85 
{
86 
        int baud;
87 
 
88 
        switch (t->c_cflag & CBAUD) {
89 
        default:        baud = -1;      break;
90 
        case B50:       baud = 50;      break;
91 
        case B75:       baud = 75;      break;
92 
        case B110:      baud = 110;     break;
93 
        case B134:      baud = 134;     break;
94 
        case B150:      baud = 150;     break;
95 
        case B200:      baud = 200;     break;
96 
        case B300:      baud = 300;     break;
97 
        case B600:      baud = 600;     break;
98 
        case B1200:     baud = 1200;    break;
99 
        case B1800:     baud = 1800;    break;
100 
        case B2400:     baud = 2400;    break;
101 
        case B4800:     baud = 4800;    break;
102 
        case B9600:     baud = 9600;    break;
103 
        case B19200:    baud = 19200;   break;
104 
        case B38400:    baud = 38400;   break;
105 
        case B57600:    baud = 57600;   break;
106 
        case B115200:   baud = 115200;  break;
107 
        case B230400:   baud = 230400;  break;
108 
        case B460800:   baud = 460800;  break;
109 
        }
110 
        if (baud > 0)
111 
                m360.brgc1 = smc1BRGC (baud);
112 
        return 0;
113 
}
114 
 
115 
/*
116 
 * Interrupt handler
117 
 */
118 
static rtems_isr
119 
smc1InterruptHandler (rtems_vector_number v)
120 
{
121 
        /*
122 
         * Buffer received?
123 
         */
124 
        if (m360.smc1.smce & 0x1) {
125 
                m360.smc1.smce = 0x1;
126 
                while ((smcRxBd->status & M360_BD_EMPTY) == 0) {
127 
                        rtems_termios_enqueue_raw_characters (smc1ttyp,
128 
                                                        (char *)smcRxBd->buffer,
129 
                                                        smcRxBd->length);
130 
                        smcRxBd->status = M360_BD_EMPTY | M360_BD_WRAP | M360_BD_INTERRUPT;
131 
                }
132 
        }
133 
 
134 
        /*
135 
         * Buffer transmitted?
136 
         */
137 
        if (m360.smc1.smce & 0x2) {
138 
                m360.smc1.smce = 0x2;
139 
                if ((smcTxBd->status & M360_BD_READY) == 0)
140 
                        rtems_termios_dequeue_characters (smc1ttyp, smcTxBd->length);
141 
        }
142 
        m360.cisr = 1UL << 4;   /* Clear SMC1 interrupt-in-service bit */
143 
}
144 
 
145 
static int
146 
smc1Initialize (int major, int minor, void *arg)
147 
{
148 
        /*
149 
         * Allocate buffer descriptors
150 
         */
151 
        smcRxBd = M360AllocateBufferDescriptors (1);
152 
        smcTxBd = M360AllocateBufferDescriptors (1);
153 
 
154 
        /*
155 
         * Configure port B pins to enable SMTXD1 and SMRXD1 pins
156 
         */
157 
        m360.pbpar |=  0xC0;
158 
        m360.pbdir &= ~0xC0;
159 
        m360.pbodr &= ~0xC0;
160 
 
161 
        /*
162 
         * Set up BRG1 (9,600 baud)
163 
         */
164 
        m360.brgc1 = M360_BRG_RST;
165 
        m360.brgc1 = smc1BRGC (console_baud_rate);
166 
 
167 
        /*
168 
         * Put SMC1 in NMSI mode, connect SMC1 to BRG1
169 
         */
170 
        m360.simode |= M360_SI_SMC1_BRG1;
171 
 
172 
        /*
173 
         * Set up SMC1 parameter RAM common to all protocols
174 
         */
175 
        m360.smc1p.rbase = (char *)smcRxBd - (char *)&m360;
176 
        m360.smc1p.tbase = (char *)smcTxBd - (char *)&m360;
177 
        m360.smc1p.rfcr = M360_RFCR_MOT | M360_RFCR_DMA_SPACE;
178 
        m360.smc1p.tfcr = M360_TFCR_MOT | M360_TFCR_DMA_SPACE;
179 
        if (m360_smc1_interrupt)
180 
                m360.smc1p.mrblr = RXBUFSIZE;
181 
        else
182 
                m360.smc1p.mrblr = 1;
183 
 
184 
        /*
185 
         * Set up SMC1 parameter RAM UART-specific parameters
186 
         */
187 
        m360.smc1p.un.uart.max_idl = 10;
188 
        m360.smc1p.un.uart.brklen = 0;
189 
        m360.smc1p.un.uart.brkec = 0;
190 
        m360.smc1p.un.uart.brkcr = 0;
191 
 
192 
        /*
193 
         * Set up the Receive Buffer Descriptor
194 
         */
195 
        smcRxBd->status = M360_BD_EMPTY | M360_BD_WRAP | M360_BD_INTERRUPT;
196 
        smcRxBd->length = 0;
197 
        smcRxBd->buffer = rxBuf;
198 
 
199 
        /*
200 
         * Setup the Transmit Buffer Descriptor
201 
         */
202 
        smcTxBd->status = M360_BD_WRAP;
203 
 
204 
        /*
205 
         * Set up SMC1 general and protocol-specific mode registers
206 
         */
207 
        m360.smc1.smce = ~0;     /* Clear any pending events */
208 
        m360.smc1.smcm = 0;      /* Mask all interrupt/event sources */
209 
        m360.smc1.smcmr = M360_SMCMR_CLEN(9) | M360_SMCMR_SM_UART;
210 
 
211 
        /*
212 
         * Send "Init parameters" command
213 
         */
214 
        M360ExecuteRISC (M360_CR_OP_INIT_RX_TX | M360_CR_CHAN_SMC1);
215 
 
216 
        /*
217 
         * Enable receiver and transmitter
218 
         */
219 
        m360.smc1.smcmr |= M360_SMCMR_TEN | M360_SMCMR_REN;
220 
 
221 
        if (m360_smc1_interrupt) {
222 
        rtems_isr_entry old_handler;
223 
        rtems_status_code sc;
224 
 
225 
        sc = rtems_interrupt_catch (smc1InterruptHandler,
226 
                                                (m360.cicr & 0xE0) | 0x04,
227 
                                                &old_handler);
228 
        m360.smc1.smcm = 3;     /* Enable SMC1 TX and RX interrupts */
229 
        m360.cimr |= 1UL << 4;  /* Enable SMC1 interrupts */
230 
        }
231 
 
232 
        return 0;
233 
}
234 
 
235 
static int
236 
smc1PollRead (int minor)
237 
{
238 
        unsigned char c;
239 
 
240 
        if (smcRxBd->status & M360_BD_EMPTY)
241 
                return -1;
242 
        c = rxBuf[0];
243 
        smcRxBd->status = M360_BD_EMPTY | M360_BD_WRAP;
244 
        return c;
245 
}
246 
 
247 
/*
248 
 * Device-dependent write routine
249 
 * Interrupt-driven devices:
250 
 *      Begin transmission of as many characters as possible (minimum is 1).
251 
 * Polling devices:
252 
 *      Transmit all characters.
253 
 */
254 
static int
255 
smc1InterruptWrite (int minor, const char *buf, int len)
256 
{
257 
        smcTxBd->buffer = (char *)buf;
258 
        smcTxBd->length = len;
259 
        smcTxBd->status = M360_BD_READY | M360_BD_WRAP | M360_BD_INTERRUPT;
260 
        return 0;
261 
}
262 
 
263 
static int
264 
smc1PollWrite (int minor, const char *buf, int len)
265 
{
266 
        while (len--) {
267 
                static char txBuf;
268 
                while (smcTxBd->status & M360_BD_READY)
269 
                        continue;
270 
                txBuf = *buf++;
271 
                smcTxBd->buffer = &txBuf;
272 
                smcTxBd->length = 1;
273 
                smcTxBd->status = M360_BD_READY | M360_BD_WRAP;
274 
        }
275 
        return 0;
276 
}
277 
 
278 
/*
279 
 ***************
280 
 * BOILERPLATE *
281 
 ***************
282 
 */
283 
 
284 
/*
285 
 * Reserve resources consumed by this driver
286 
 *
287 
 * NOTE: This is in another file to reduce dependencies on the minimum size.
288 
 */
289 
 
290 
/*
291 
 * Initialize and register the device
292 
 */
293 
rtems_device_driver console_initialize(
294 
  rtems_device_major_number  major,
295 
  rtems_device_minor_number  minor,
296 
  void                      *arg
297 
)
298 
{
299 
        rtems_status_code status;
300 
 
301 
        /*
302 
         * Set up TERMIOS
303 
         */
304 
        rtems_termios_initialize ();
305 
 
306 
        /*
307 
         * Register the device
308 
         */
309 
        status = rtems_io_register_name ("/dev/console", major, 0);
310 
        if (status != RTEMS_SUCCESSFUL)
311 
                rtems_fatal_error_occurred (status);
312 
        return RTEMS_SUCCESSFUL;
313 
}
314 
 
315 
/*
316 
 * Open the device
317 
 */
318 
rtems_device_driver console_open(
319 
  rtems_device_major_number major,
320 
  rtems_device_minor_number minor,
321 
  void                    * arg
322 
)
323 
{
324 
        rtems_status_code sc;
325 
        static const rtems_termios_callbacks intrCallbacks = {
326 
                smc1Initialize,         /* firstOpen */
327 
                NULL,                   /* lastClose */
328 
                NULL,                   /* pollRead */
329 
                smc1InterruptWrite,     /* write */
330 
                smc1SetAttributes,      /* setAttributes */
331 
                NULL,                   /* stopRemoteTx */
332 
                NULL,                   /* startRemoteTx */
333 
                1                       /* outputUsesInterrupts */
334 
        };
335 
        static const rtems_termios_callbacks pollCallbacks = {
336 
                smc1Initialize,         /* firstOpen */
337 
                NULL,                   /* lastClose */
338 
                smc1PollRead,           /* pollRead */
339 
                smc1PollWrite,          /* write */
340 
                smc1SetAttributes,      /* setAttributes */
341 
                NULL,                   /* stopRemoteTx */
342 
                NULL,                   /* startRemoteTx */
343 
 
344 
        };
345 
 
346 
        /*
347 
         * Do generic termios initialization
348 
         */
349 
        if (m360_smc1_interrupt) {
350 
                rtems_libio_open_close_args_t *args = arg;
351 
 
352 
                sc = rtems_termios_open (major, minor, arg, &intrCallbacks);
353 
                smc1ttyp = args->iop->data1;
354 
        }
355 
        else {
356 
                sc = rtems_termios_open (major, minor, arg, &pollCallbacks);
357 
        }
358 
        return sc;
359 
}
360 
 
361 
/*
362 
 * Close the device
363 
 */
364 
rtems_device_driver console_close(
365 
  rtems_device_major_number major,
366 
  rtems_device_minor_number minor,
367 
  void                    * arg
368 
)
369 
{
370 
        return rtems_termios_close (arg);
371 
}
372 
 
373 
/*
374 
 * Read from the device
375 
 */
376 
rtems_device_driver console_read(
377 
  rtems_device_major_number major,
378 
  rtems_device_minor_number minor,
379 
  void                    * arg
380 
)
381 
{
382 
        return rtems_termios_read (arg);
383 
}
384 
 
385 
/*
386 
 * Write to the device
387 
 */
388 
rtems_device_driver console_write(
389 
  rtems_device_major_number major,
390 
  rtems_device_minor_number minor,
391 
  void                    * arg
392 
)
393 
{
394 
        return rtems_termios_write (arg);
395 
}
396 
 
397 
/*
398 
 * Handle ioctl request.
399 
 */
400 
rtems_device_driver console_control(
401 
  rtems_device_major_number major,
402 
  rtems_device_minor_number minor,
403 
  void                    * arg
404 
)
405 
{
406 
        return rtems_termios_ioctl (arg);
407 
}

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