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wdenkaffae2b2002-08-17 09:36:01 +00001/*
2 * (C) Copyright 2002 SIXNET, dge@sixnetio.com.
3 *
wdenkec4c5442004-02-09 23:12:24 +00004 * (C) Copyright 2004, Li-Pro.Net <www.li-pro.net>
5 * Stephan Linz <linz@li-pro.net>
6 *
wdenkaffae2b2002-08-17 09:36:01 +00007 * See file CREDITS for list of people who contributed to this
8 * project.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
23 * MA 02111-1307 USA
24 */
25
26/*
wdenkec4c5442004-02-09 23:12:24 +000027 * Date & Time support for DS1306 RTC using SPI:
28 *
29 * - SXNI855T: it uses its own soft SPI here in this file
30 * - all other: use the external spi_xfer() function
31 * (see include/spi.h)
wdenkaffae2b2002-08-17 09:36:01 +000032 */
33
34#include <common.h>
35#include <command.h>
36#include <rtc.h>
wdenkec4c5442004-02-09 23:12:24 +000037#include <spi.h>
wdenkaffae2b2002-08-17 09:36:01 +000038
Jon Loeligera5938142007-07-09 18:10:50 -050039#if defined(CONFIG_RTC_DS1306) && defined(CONFIG_CMD_DATE)
wdenkaffae2b2002-08-17 09:36:01 +000040
wdenkec4c5442004-02-09 23:12:24 +000041#define RTC_SECONDS 0x00
42#define RTC_MINUTES 0x01
43#define RTC_HOURS 0x02
44#define RTC_DAY_OF_WEEK 0x03
45#define RTC_DATE_OF_MONTH 0x04
46#define RTC_MONTH 0x05
47#define RTC_YEAR 0x06
48
49#define RTC_SECONDS_ALARM0 0x07
50#define RTC_MINUTES_ALARM0 0x08
51#define RTC_HOURS_ALARM0 0x09
52#define RTC_DAY_OF_WEEK_ALARM0 0x0a
53
54#define RTC_SECONDS_ALARM1 0x0b
55#define RTC_MINUTES_ALARM1 0x0c
56#define RTC_HOURS_ALARM1 0x0d
57#define RTC_DAY_OF_WEEK_ALARM1 0x0e
58
59#define RTC_CONTROL 0x0f
60#define RTC_STATUS 0x10
61#define RTC_TRICKLE_CHARGER 0x11
62
63#define RTC_USER_RAM_BASE 0x20
64
wdenkec4c5442004-02-09 23:12:24 +000065static unsigned int bin2bcd (unsigned int n);
66static unsigned char bcd2bin (unsigned char c);
wdenkec4c5442004-02-09 23:12:24 +000067
wdenkec4c5442004-02-09 23:12:24 +000068/* ************************************************************************* */
69#ifdef CONFIG_SXNI855T /* !!! SHOULD BE CHANGED TO NEW CODE !!! */
70
71static void soft_spi_send (unsigned char n);
72static unsigned char soft_spi_read (void);
73static void init_spi (void);
wdenkaffae2b2002-08-17 09:36:01 +000074
75/*-----------------------------------------------------------------------
76 * Definitions
77 */
78
79#define PB_SPISCK 0x00000002 /* PB 30 */
80#define PB_SPIMOSI 0x00000004 /* PB 29 */
81#define PB_SPIMISO 0x00000008 /* PB 28 */
82#define PB_SPI_CE 0x00010000 /* PB 15 */
83
84/* ------------------------------------------------------------------------- */
85
86/* read clock time from DS1306 and return it in *tmp */
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +030087int rtc_get (struct rtc_time *tmp)
wdenkaffae2b2002-08-17 09:36:01 +000088{
wdenkec4c5442004-02-09 23:12:24 +000089 volatile immap_t *immap = (immap_t *) CFG_IMMR;
90 unsigned char spi_byte; /* Data Byte */
wdenkaffae2b2002-08-17 09:36:01 +000091
wdenkec4c5442004-02-09 23:12:24 +000092 init_spi (); /* set port B for software SPI */
wdenkaffae2b2002-08-17 09:36:01 +000093
wdenkec4c5442004-02-09 23:12:24 +000094 /* Now we can enable the DS1306 RTC */
95 immap->im_cpm.cp_pbdat |= PB_SPI_CE;
96 udelay (10);
wdenkaffae2b2002-08-17 09:36:01 +000097
wdenkec4c5442004-02-09 23:12:24 +000098 /* Shift out the address (0) of the time in the Clock Chip */
99 soft_spi_send (0);
wdenkaffae2b2002-08-17 09:36:01 +0000100
wdenkec4c5442004-02-09 23:12:24 +0000101 /* Put the clock readings into the rtc_time structure */
102 tmp->tm_sec = bcd2bin (soft_spi_read ()); /* Read seconds */
103 tmp->tm_min = bcd2bin (soft_spi_read ()); /* Read minutes */
wdenkaffae2b2002-08-17 09:36:01 +0000104
wdenkec4c5442004-02-09 23:12:24 +0000105 /* Hours are trickier */
106 spi_byte = soft_spi_read (); /* Read Hours into temporary value */
107 if (spi_byte & 0x40) {
108 /* 12 hour mode bit is set (time is in 1-12 format) */
109 if (spi_byte & 0x20) {
110 /* since PM we add 11 to get 0-23 for hours */
111 tmp->tm_hour = (bcd2bin (spi_byte & 0x1F)) + 11;
112 } else {
113 /* since AM we subtract 1 to get 0-23 for hours */
114 tmp->tm_hour = (bcd2bin (spi_byte & 0x1F)) - 1;
115 }
116 } else {
117 /* Otherwise, 0-23 hour format */
118 tmp->tm_hour = (bcd2bin (spi_byte & 0x3F));
wdenkaffae2b2002-08-17 09:36:01 +0000119 }
wdenkaffae2b2002-08-17 09:36:01 +0000120
wdenkec4c5442004-02-09 23:12:24 +0000121 soft_spi_read (); /* Read and discard Day of week */
122 tmp->tm_mday = bcd2bin (soft_spi_read ()); /* Read Day of the Month */
123 tmp->tm_mon = bcd2bin (soft_spi_read ()); /* Read Month */
wdenkaffae2b2002-08-17 09:36:01 +0000124
wdenkec4c5442004-02-09 23:12:24 +0000125 /* Read Year and convert to this century */
126 tmp->tm_year = bcd2bin (soft_spi_read ()) + 2000;
wdenkaffae2b2002-08-17 09:36:01 +0000127
wdenkec4c5442004-02-09 23:12:24 +0000128 /* Now we can disable the DS1306 RTC */
129 immap->im_cpm.cp_pbdat &= ~PB_SPI_CE; /* Disable DS1306 Chip */
130 udelay (10);
wdenkaffae2b2002-08-17 09:36:01 +0000131
wdenkec4c5442004-02-09 23:12:24 +0000132 GregorianDay (tmp); /* Determine the day of week */
wdenkaffae2b2002-08-17 09:36:01 +0000133
wdenkec4c5442004-02-09 23:12:24 +0000134 debug ("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
135 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
136 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +0300137
138 return 0;
wdenkaffae2b2002-08-17 09:36:01 +0000139}
140
141/* ------------------------------------------------------------------------- */
142
143/* set clock time in DS1306 RTC and in MPC8xx RTC */
wdenkec4c5442004-02-09 23:12:24 +0000144void rtc_set (struct rtc_time *tmp)
wdenkaffae2b2002-08-17 09:36:01 +0000145{
wdenkec4c5442004-02-09 23:12:24 +0000146 volatile immap_t *immap = (immap_t *) CFG_IMMR;
wdenkaffae2b2002-08-17 09:36:01 +0000147
wdenkec4c5442004-02-09 23:12:24 +0000148 init_spi (); /* set port B for software SPI */
wdenkaffae2b2002-08-17 09:36:01 +0000149
wdenkec4c5442004-02-09 23:12:24 +0000150 /* Now we can enable the DS1306 RTC */
151 immap->im_cpm.cp_pbdat |= PB_SPI_CE; /* Enable DS1306 Chip */
152 udelay (10);
wdenkaffae2b2002-08-17 09:36:01 +0000153
wdenkec4c5442004-02-09 23:12:24 +0000154 /* First disable write protect in the clock chip control register */
155 soft_spi_send (0x8F); /* send address of the control register */
156 soft_spi_send (0x00); /* send control register contents */
wdenkaffae2b2002-08-17 09:36:01 +0000157
wdenkec4c5442004-02-09 23:12:24 +0000158 /* Now disable the DS1306 to terminate the write */
159 immap->im_cpm.cp_pbdat &= ~PB_SPI_CE;
160 udelay (10);
wdenkaffae2b2002-08-17 09:36:01 +0000161
wdenkec4c5442004-02-09 23:12:24 +0000162 /* Now enable the DS1306 to initiate a new write */
163 immap->im_cpm.cp_pbdat |= PB_SPI_CE;
164 udelay (10);
wdenkaffae2b2002-08-17 09:36:01 +0000165
wdenkec4c5442004-02-09 23:12:24 +0000166 /* Next, send the address of the clock time write registers */
167 soft_spi_send (0x80); /* send address of the first time register */
wdenkaffae2b2002-08-17 09:36:01 +0000168
wdenkec4c5442004-02-09 23:12:24 +0000169 /* Use Burst Mode to send all of the time data to the clock */
170 bin2bcd (tmp->tm_sec);
171 soft_spi_send (bin2bcd (tmp->tm_sec)); /* Send Seconds */
172 soft_spi_send (bin2bcd (tmp->tm_min)); /* Send Minutes */
173 soft_spi_send (bin2bcd (tmp->tm_hour)); /* Send Hour */
174 soft_spi_send (bin2bcd (tmp->tm_wday)); /* Send Day of the Week */
175 soft_spi_send (bin2bcd (tmp->tm_mday)); /* Send Day of Month */
176 soft_spi_send (bin2bcd (tmp->tm_mon)); /* Send Month */
177 soft_spi_send (bin2bcd (tmp->tm_year - 2000)); /* Send Year */
wdenkaffae2b2002-08-17 09:36:01 +0000178
wdenkec4c5442004-02-09 23:12:24 +0000179 /* Now we can disable the Clock chip to terminate the burst write */
180 immap->im_cpm.cp_pbdat &= ~PB_SPI_CE; /* Disable DS1306 Chip */
181 udelay (10);
wdenkaffae2b2002-08-17 09:36:01 +0000182
wdenkec4c5442004-02-09 23:12:24 +0000183 /* Now we can enable the Clock chip to initiate a new write */
184 immap->im_cpm.cp_pbdat |= PB_SPI_CE; /* Enable DS1306 Chip */
185 udelay (10);
wdenkaffae2b2002-08-17 09:36:01 +0000186
wdenkec4c5442004-02-09 23:12:24 +0000187 /* First we Enable write protect in the clock chip control register */
188 soft_spi_send (0x8F); /* send address of the control register */
189 soft_spi_send (0x40); /* send out Control Register contents */
wdenkaffae2b2002-08-17 09:36:01 +0000190
wdenkec4c5442004-02-09 23:12:24 +0000191 /* Now disable the DS1306 */
192 immap->im_cpm.cp_pbdat &= ~PB_SPI_CE; /* Disable DS1306 Chip */
193 udelay (10);
wdenkaffae2b2002-08-17 09:36:01 +0000194
wdenkec4c5442004-02-09 23:12:24 +0000195 /* Set standard MPC8xx clock to the same time so Linux will
196 * see the time even if it doesn't have a DS1306 clock driver.
197 * This helps with experimenting with standard kernels.
198 */
199 {
200 ulong tim;
wdenkaffae2b2002-08-17 09:36:01 +0000201
wdenkec4c5442004-02-09 23:12:24 +0000202 tim = mktime (tmp->tm_year, tmp->tm_mon, tmp->tm_mday,
203 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
wdenkaffae2b2002-08-17 09:36:01 +0000204
wdenkec4c5442004-02-09 23:12:24 +0000205 immap->im_sitk.sitk_rtck = KAPWR_KEY;
206 immap->im_sit.sit_rtc = tim;
207 }
wdenkaffae2b2002-08-17 09:36:01 +0000208
wdenkec4c5442004-02-09 23:12:24 +0000209 debug ("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
210 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
211 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
wdenkaffae2b2002-08-17 09:36:01 +0000212}
213
214/* ------------------------------------------------------------------------- */
215
216/* Initialize Port B for software SPI */
wdenkec4c5442004-02-09 23:12:24 +0000217static void init_spi (void)
218{
219 volatile immap_t *immap = (immap_t *) CFG_IMMR;
wdenkaffae2b2002-08-17 09:36:01 +0000220
wdenkec4c5442004-02-09 23:12:24 +0000221 /* Force output pins to begin at logic 0 */
222 immap->im_cpm.cp_pbdat &= ~(PB_SPI_CE | PB_SPIMOSI | PB_SPISCK);
wdenkaffae2b2002-08-17 09:36:01 +0000223
wdenkec4c5442004-02-09 23:12:24 +0000224 /* Set these 3 signals as outputs */
225 immap->im_cpm.cp_pbdir |= (PB_SPIMOSI | PB_SPI_CE | PB_SPISCK);
wdenkaffae2b2002-08-17 09:36:01 +0000226
wdenkec4c5442004-02-09 23:12:24 +0000227 immap->im_cpm.cp_pbdir &= ~PB_SPIMISO; /* Make MISO pin an input */
228 udelay (10);
wdenkaffae2b2002-08-17 09:36:01 +0000229}
230
231/* ------------------------------------------------------------------------- */
232
233/* NOTE: soft_spi_send() assumes that the I/O lines are configured already */
wdenkec4c5442004-02-09 23:12:24 +0000234static void soft_spi_send (unsigned char n)
wdenkaffae2b2002-08-17 09:36:01 +0000235{
wdenkec4c5442004-02-09 23:12:24 +0000236 volatile immap_t *immap = (immap_t *) CFG_IMMR;
237 unsigned char bitpos; /* bit position to receive */
238 unsigned char i; /* Loop Control */
wdenkaffae2b2002-08-17 09:36:01 +0000239
wdenkec4c5442004-02-09 23:12:24 +0000240 /* bit position to send, start with most significant bit */
241 bitpos = 0x80;
wdenkaffae2b2002-08-17 09:36:01 +0000242
wdenkec4c5442004-02-09 23:12:24 +0000243 /* Send 8 bits to software SPI */
244 for (i = 0; i < 8; i++) { /* Loop for 8 bits */
245 immap->im_cpm.cp_pbdat |= PB_SPISCK; /* Raise SCK */
wdenkaffae2b2002-08-17 09:36:01 +0000246
wdenkec4c5442004-02-09 23:12:24 +0000247 if (n & bitpos)
248 immap->im_cpm.cp_pbdat |= PB_SPIMOSI; /* Set MOSI to 1 */
249 else
250 immap->im_cpm.cp_pbdat &= ~PB_SPIMOSI; /* Set MOSI to 0 */
251 udelay (10);
wdenkaffae2b2002-08-17 09:36:01 +0000252
wdenkec4c5442004-02-09 23:12:24 +0000253 immap->im_cpm.cp_pbdat &= ~PB_SPISCK; /* Lower SCK */
254 udelay (10);
wdenkaffae2b2002-08-17 09:36:01 +0000255
wdenkec4c5442004-02-09 23:12:24 +0000256 bitpos >>= 1; /* Shift for next bit position */
257 }
wdenkaffae2b2002-08-17 09:36:01 +0000258}
259
260/* ------------------------------------------------------------------------- */
261
262/* NOTE: soft_spi_read() assumes that the I/O lines are configured already */
wdenkec4c5442004-02-09 23:12:24 +0000263static unsigned char soft_spi_read (void)
wdenkaffae2b2002-08-17 09:36:01 +0000264{
wdenkec4c5442004-02-09 23:12:24 +0000265 volatile immap_t *immap = (immap_t *) CFG_IMMR;
wdenkaffae2b2002-08-17 09:36:01 +0000266
wdenkec4c5442004-02-09 23:12:24 +0000267 unsigned char spi_byte = 0; /* Return value, assume success */
268 unsigned char bitpos; /* bit position to receive */
269 unsigned char i; /* Loop Control */
wdenkaffae2b2002-08-17 09:36:01 +0000270
wdenkec4c5442004-02-09 23:12:24 +0000271 /* bit position to receive, start with most significant bit */
272 bitpos = 0x80;
wdenkaffae2b2002-08-17 09:36:01 +0000273
wdenkec4c5442004-02-09 23:12:24 +0000274 /* Read 8 bits here */
275 for (i = 0; i < 8; i++) { /* Do 8 bits in loop */
276 immap->im_cpm.cp_pbdat |= PB_SPISCK; /* Raise SCK */
277 udelay (10);
278 if (immap->im_cpm.cp_pbdat & PB_SPIMISO) /* Get a bit of data */
279 spi_byte |= bitpos; /* Set data accordingly */
280 immap->im_cpm.cp_pbdat &= ~PB_SPISCK; /* Lower SCK */
281 udelay (10);
282 bitpos >>= 1; /* Shift for next bit position */
283 }
wdenkaffae2b2002-08-17 09:36:01 +0000284
wdenkec4c5442004-02-09 23:12:24 +0000285 return spi_byte; /* Return the byte read */
wdenkaffae2b2002-08-17 09:36:01 +0000286}
287
288/* ------------------------------------------------------------------------- */
289
wdenkec4c5442004-02-09 23:12:24 +0000290void rtc_reset (void)
291{
292 return; /* nothing to do */
293}
294
295#else /* not CONFIG_SXNI855T */
296/* ************************************************************************* */
297
wdenk3f85ce22004-02-23 16:11:30 +0000298static unsigned char rtc_read (unsigned char reg);
299static void rtc_write (unsigned char reg, unsigned char val);
300
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200301static struct spi_slave *slave;
302
wdenkec4c5442004-02-09 23:12:24 +0000303/* read clock time from DS1306 and return it in *tmp */
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +0300304int rtc_get (struct rtc_time *tmp)
wdenkec4c5442004-02-09 23:12:24 +0000305{
306 unsigned char sec, min, hour, mday, wday, mon, year;
307
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200308 /*
309 * Assuming Vcc = 2.0V (lowest speed)
310 *
311 * REVISIT: If we add an rtc_init() function we can do this
312 * step just once.
313 */
314 if (!slave) {
315 slave = spi_setup_slave(0, CFG_SPI_RTC_DEVID, 600000,
316 SPI_MODE_3 | SPI_CS_HIGH);
317 if (!slave)
318 return;
319 }
320
321 if (spi_claim_bus(slave))
322 return;
323
wdenkec4c5442004-02-09 23:12:24 +0000324 sec = rtc_read (RTC_SECONDS);
325 min = rtc_read (RTC_MINUTES);
326 hour = rtc_read (RTC_HOURS);
327 mday = rtc_read (RTC_DATE_OF_MONTH);
328 wday = rtc_read (RTC_DAY_OF_WEEK);
329 mon = rtc_read (RTC_MONTH);
330 year = rtc_read (RTC_YEAR);
331
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200332 spi_release_bus(slave);
333
wdenkec4c5442004-02-09 23:12:24 +0000334 debug ("Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
335 "hr: %02x min: %02x sec: %02x\n",
336 year, mon, mday, wday, hour, min, sec);
337 debug ("Alarms[0]: wday: %02x hour: %02x min: %02x sec: %02x\n",
338 rtc_read (RTC_DAY_OF_WEEK_ALARM0),
339 rtc_read (RTC_HOURS_ALARM0),
340 rtc_read (RTC_MINUTES_ALARM0), rtc_read (RTC_SECONDS_ALARM0));
341 debug ("Alarms[1]: wday: %02x hour: %02x min: %02x sec: %02x\n",
342 rtc_read (RTC_DAY_OF_WEEK_ALARM1),
343 rtc_read (RTC_HOURS_ALARM1),
344 rtc_read (RTC_MINUTES_ALARM1), rtc_read (RTC_SECONDS_ALARM1));
345
346 tmp->tm_sec = bcd2bin (sec & 0x7F); /* convert Seconds */
347 tmp->tm_min = bcd2bin (min & 0x7F); /* convert Minutes */
348
349 /* convert Hours */
350 tmp->tm_hour = (hour & 0x40)
351 ? ((hour & 0x20) /* 12 hour mode */
352 ? bcd2bin (hour & 0x1F) + 11 /* PM */
353 : bcd2bin (hour & 0x1F) - 1 /* AM */
354 )
355 : bcd2bin (hour & 0x3F); /* 24 hour mode */
356
357 tmp->tm_mday = bcd2bin (mday & 0x3F); /* convert Day of the Month */
358 tmp->tm_mon = bcd2bin (mon & 0x1F); /* convert Month */
359 tmp->tm_year = bcd2bin (year) + 2000; /* convert Year */
360 tmp->tm_wday = bcd2bin (wday & 0x07) - 1; /* convert Day of the Week */
361 tmp->tm_yday = 0;
362 tmp->tm_isdst = 0;
363
364 debug ("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
365 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
366 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +0300367
368 return 0;
wdenkec4c5442004-02-09 23:12:24 +0000369}
370
371/* ------------------------------------------------------------------------- */
372
373/* set clock time from *tmp in DS1306 RTC */
374void rtc_set (struct rtc_time *tmp)
375{
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200376 /* Assuming Vcc = 2.0V (lowest speed) */
377 if (!slave) {
378 slave = spi_setup_slave(0, CFG_SPI_RTC_DEVID, 600000,
379 SPI_MODE_3 | SPI_CS_HIGH);
380 if (!slave)
381 return;
382 }
383
384 if (spi_claim_bus(slave))
385 return;
386
wdenkec4c5442004-02-09 23:12:24 +0000387 debug ("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
388 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
389 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
390
wdenkec4c5442004-02-09 23:12:24 +0000391 rtc_write (RTC_SECONDS, bin2bcd (tmp->tm_sec));
Wolfgang Denkda4849f2006-05-03 01:04:58 +0200392 rtc_write (RTC_MINUTES, bin2bcd (tmp->tm_min));
393 rtc_write (RTC_HOURS, bin2bcd (tmp->tm_hour));
394 rtc_write (RTC_DAY_OF_WEEK, bin2bcd (tmp->tm_wday + 1));
395 rtc_write (RTC_DATE_OF_MONTH, bin2bcd (tmp->tm_mday));
396 rtc_write (RTC_MONTH, bin2bcd (tmp->tm_mon));
397 rtc_write (RTC_YEAR, bin2bcd (tmp->tm_year - 2000));
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200398
399 spi_release_bus(slave);
wdenkec4c5442004-02-09 23:12:24 +0000400}
401
402/* ------------------------------------------------------------------------- */
403
404/* reset the DS1306 */
405void rtc_reset (void)
406{
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200407 /* Assuming Vcc = 2.0V (lowest speed) */
408 if (!slave) {
409 slave = spi_setup_slave(0, CFG_SPI_RTC_DEVID, 600000,
410 SPI_MODE_3 | SPI_CS_HIGH);
411 if (!slave)
412 return;
413 }
414
415 if (spi_claim_bus(slave))
416 return;
417
wdenkec4c5442004-02-09 23:12:24 +0000418 /* clear the control register */
419 rtc_write (RTC_CONTROL, 0x00); /* 1st step: reset WP */
420 rtc_write (RTC_CONTROL, 0x00); /* 2nd step: reset 1Hz, AIE1, AIE0 */
421
422 /* reset all alarms */
423 rtc_write (RTC_SECONDS_ALARM0, 0x00);
424 rtc_write (RTC_SECONDS_ALARM1, 0x00);
425 rtc_write (RTC_MINUTES_ALARM0, 0x00);
426 rtc_write (RTC_MINUTES_ALARM1, 0x00);
427 rtc_write (RTC_HOURS_ALARM0, 0x00);
428 rtc_write (RTC_HOURS_ALARM1, 0x00);
429 rtc_write (RTC_DAY_OF_WEEK_ALARM0, 0x00);
430 rtc_write (RTC_DAY_OF_WEEK_ALARM1, 0x00);
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200431
432 spi_release_bus(slave);
wdenkec4c5442004-02-09 23:12:24 +0000433}
434
435/* ------------------------------------------------------------------------- */
436
437static unsigned char rtc_read (unsigned char reg)
438{
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200439 int ret;
wdenkec4c5442004-02-09 23:12:24 +0000440
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200441 ret = spi_w8r8(slave, reg);
442 return ret < 0 ? 0 : ret;
wdenkec4c5442004-02-09 23:12:24 +0000443}
444
445/* ------------------------------------------------------------------------- */
446
447static void rtc_write (unsigned char reg, unsigned char val)
448{
449 unsigned char dout[2]; /* SPI Output Data Bytes */
450 unsigned char din[2]; /* SPI Input Data Bytes */
451
452 dout[0] = 0x80 | reg;
453 dout[1] = val;
454
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200455 spi_xfer (slave, 16, dout, din, SPI_XFER_BEGIN | SPI_XFER_END);
wdenkec4c5442004-02-09 23:12:24 +0000456}
457
458#endif /* end of code exclusion (see #ifdef CONFIG_SXNI855T above) */
459
460/* ------------------------------------------------------------------------- */
461
462static unsigned char bcd2bin (unsigned char n)
463{
464 return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
465}
466
467/* ------------------------------------------------------------------------- */
468
469static unsigned int bin2bcd (unsigned int n)
470{
471 return (((n / 10) << 4) | (n % 10));
472}
473/* ------------------------------------------------------------------------- */
474
wdenkaffae2b2002-08-17 09:36:01 +0000475#endif