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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 *
Wolfgang Denk1a459662013-07-08 09:37:19 +02007 * SPDX-License-Identifier: GPL-2.0+
wdenkaffae2b2002-08-17 09:36:01 +00008 */
9
10/*
wdenkec4c5442004-02-09 23:12:24 +000011 * Date & Time support for DS1306 RTC using SPI:
12 *
13 * - SXNI855T: it uses its own soft SPI here in this file
14 * - all other: use the external spi_xfer() function
15 * (see include/spi.h)
wdenkaffae2b2002-08-17 09:36:01 +000016 */
17
18#include <common.h>
19#include <command.h>
20#include <rtc.h>
wdenkec4c5442004-02-09 23:12:24 +000021#include <spi.h>
wdenkaffae2b2002-08-17 09:36:01 +000022
Michal Simek871c18d2008-07-14 19:45:37 +020023#if defined(CONFIG_CMD_DATE)
wdenkaffae2b2002-08-17 09:36:01 +000024
wdenkec4c5442004-02-09 23:12:24 +000025#define RTC_SECONDS 0x00
26#define RTC_MINUTES 0x01
27#define RTC_HOURS 0x02
28#define RTC_DAY_OF_WEEK 0x03
29#define RTC_DATE_OF_MONTH 0x04
30#define RTC_MONTH 0x05
31#define RTC_YEAR 0x06
32
33#define RTC_SECONDS_ALARM0 0x07
34#define RTC_MINUTES_ALARM0 0x08
35#define RTC_HOURS_ALARM0 0x09
36#define RTC_DAY_OF_WEEK_ALARM0 0x0a
37
38#define RTC_SECONDS_ALARM1 0x0b
39#define RTC_MINUTES_ALARM1 0x0c
40#define RTC_HOURS_ALARM1 0x0d
41#define RTC_DAY_OF_WEEK_ALARM1 0x0e
42
43#define RTC_CONTROL 0x0f
44#define RTC_STATUS 0x10
45#define RTC_TRICKLE_CHARGER 0x11
46
47#define RTC_USER_RAM_BASE 0x20
48
wdenkec4c5442004-02-09 23:12:24 +000049/* ************************************************************************* */
50#ifdef CONFIG_SXNI855T /* !!! SHOULD BE CHANGED TO NEW CODE !!! */
51
52static void soft_spi_send (unsigned char n);
53static unsigned char soft_spi_read (void);
54static void init_spi (void);
wdenkaffae2b2002-08-17 09:36:01 +000055
56/*-----------------------------------------------------------------------
57 * Definitions
58 */
59
60#define PB_SPISCK 0x00000002 /* PB 30 */
61#define PB_SPIMOSI 0x00000004 /* PB 29 */
62#define PB_SPIMISO 0x00000008 /* PB 28 */
63#define PB_SPI_CE 0x00010000 /* PB 15 */
64
65/* ------------------------------------------------------------------------- */
66
67/* read clock time from DS1306 and return it in *tmp */
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +030068int rtc_get (struct rtc_time *tmp)
wdenkaffae2b2002-08-17 09:36:01 +000069{
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020070 volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
wdenkec4c5442004-02-09 23:12:24 +000071 unsigned char spi_byte; /* Data Byte */
wdenkaffae2b2002-08-17 09:36:01 +000072
wdenkec4c5442004-02-09 23:12:24 +000073 init_spi (); /* set port B for software SPI */
wdenkaffae2b2002-08-17 09:36:01 +000074
wdenkec4c5442004-02-09 23:12:24 +000075 /* Now we can enable the DS1306 RTC */
76 immap->im_cpm.cp_pbdat |= PB_SPI_CE;
77 udelay (10);
wdenkaffae2b2002-08-17 09:36:01 +000078
wdenkec4c5442004-02-09 23:12:24 +000079 /* Shift out the address (0) of the time in the Clock Chip */
80 soft_spi_send (0);
wdenkaffae2b2002-08-17 09:36:01 +000081
wdenkec4c5442004-02-09 23:12:24 +000082 /* Put the clock readings into the rtc_time structure */
83 tmp->tm_sec = bcd2bin (soft_spi_read ()); /* Read seconds */
84 tmp->tm_min = bcd2bin (soft_spi_read ()); /* Read minutes */
wdenkaffae2b2002-08-17 09:36:01 +000085
wdenkec4c5442004-02-09 23:12:24 +000086 /* Hours are trickier */
87 spi_byte = soft_spi_read (); /* Read Hours into temporary value */
88 if (spi_byte & 0x40) {
89 /* 12 hour mode bit is set (time is in 1-12 format) */
90 if (spi_byte & 0x20) {
91 /* since PM we add 11 to get 0-23 for hours */
92 tmp->tm_hour = (bcd2bin (spi_byte & 0x1F)) + 11;
93 } else {
94 /* since AM we subtract 1 to get 0-23 for hours */
95 tmp->tm_hour = (bcd2bin (spi_byte & 0x1F)) - 1;
96 }
97 } else {
98 /* Otherwise, 0-23 hour format */
99 tmp->tm_hour = (bcd2bin (spi_byte & 0x3F));
wdenkaffae2b2002-08-17 09:36:01 +0000100 }
wdenkaffae2b2002-08-17 09:36:01 +0000101
wdenkec4c5442004-02-09 23:12:24 +0000102 soft_spi_read (); /* Read and discard Day of week */
103 tmp->tm_mday = bcd2bin (soft_spi_read ()); /* Read Day of the Month */
104 tmp->tm_mon = bcd2bin (soft_spi_read ()); /* Read Month */
wdenkaffae2b2002-08-17 09:36:01 +0000105
wdenkec4c5442004-02-09 23:12:24 +0000106 /* Read Year and convert to this century */
107 tmp->tm_year = bcd2bin (soft_spi_read ()) + 2000;
wdenkaffae2b2002-08-17 09:36:01 +0000108
wdenkec4c5442004-02-09 23:12:24 +0000109 /* Now we can disable the DS1306 RTC */
110 immap->im_cpm.cp_pbdat &= ~PB_SPI_CE; /* Disable DS1306 Chip */
111 udelay (10);
wdenkaffae2b2002-08-17 09:36:01 +0000112
Simon Glass199e87c2015-04-20 12:37:17 -0600113 rtc_calc_weekday(tmp); /* Determine the day of week */
wdenkaffae2b2002-08-17 09:36:01 +0000114
wdenkec4c5442004-02-09 23:12:24 +0000115 debug ("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
116 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
117 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +0300118
119 return 0;
wdenkaffae2b2002-08-17 09:36:01 +0000120}
121
122/* ------------------------------------------------------------------------- */
123
124/* set clock time in DS1306 RTC and in MPC8xx RTC */
Jean-Christophe PLAGNIOL-VILLARDd1e23192008-09-01 23:06:23 +0200125int rtc_set (struct rtc_time *tmp)
wdenkaffae2b2002-08-17 09:36:01 +0000126{
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200127 volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
wdenkaffae2b2002-08-17 09:36:01 +0000128
wdenkec4c5442004-02-09 23:12:24 +0000129 init_spi (); /* set port B for software SPI */
wdenkaffae2b2002-08-17 09:36:01 +0000130
wdenkec4c5442004-02-09 23:12:24 +0000131 /* Now we can enable the DS1306 RTC */
132 immap->im_cpm.cp_pbdat |= PB_SPI_CE; /* Enable DS1306 Chip */
133 udelay (10);
wdenkaffae2b2002-08-17 09:36:01 +0000134
wdenkec4c5442004-02-09 23:12:24 +0000135 /* First disable write protect in the clock chip control register */
136 soft_spi_send (0x8F); /* send address of the control register */
137 soft_spi_send (0x00); /* send control register contents */
wdenkaffae2b2002-08-17 09:36:01 +0000138
wdenkec4c5442004-02-09 23:12:24 +0000139 /* Now disable the DS1306 to terminate the write */
140 immap->im_cpm.cp_pbdat &= ~PB_SPI_CE;
141 udelay (10);
wdenkaffae2b2002-08-17 09:36:01 +0000142
wdenkec4c5442004-02-09 23:12:24 +0000143 /* Now enable the DS1306 to initiate a new write */
144 immap->im_cpm.cp_pbdat |= PB_SPI_CE;
145 udelay (10);
wdenkaffae2b2002-08-17 09:36:01 +0000146
wdenkec4c5442004-02-09 23:12:24 +0000147 /* Next, send the address of the clock time write registers */
148 soft_spi_send (0x80); /* send address of the first time register */
wdenkaffae2b2002-08-17 09:36:01 +0000149
wdenkec4c5442004-02-09 23:12:24 +0000150 /* Use Burst Mode to send all of the time data to the clock */
151 bin2bcd (tmp->tm_sec);
152 soft_spi_send (bin2bcd (tmp->tm_sec)); /* Send Seconds */
153 soft_spi_send (bin2bcd (tmp->tm_min)); /* Send Minutes */
154 soft_spi_send (bin2bcd (tmp->tm_hour)); /* Send Hour */
155 soft_spi_send (bin2bcd (tmp->tm_wday)); /* Send Day of the Week */
156 soft_spi_send (bin2bcd (tmp->tm_mday)); /* Send Day of Month */
157 soft_spi_send (bin2bcd (tmp->tm_mon)); /* Send Month */
158 soft_spi_send (bin2bcd (tmp->tm_year - 2000)); /* Send Year */
wdenkaffae2b2002-08-17 09:36:01 +0000159
wdenkec4c5442004-02-09 23:12:24 +0000160 /* Now we can disable the Clock chip to terminate the burst write */
161 immap->im_cpm.cp_pbdat &= ~PB_SPI_CE; /* Disable DS1306 Chip */
162 udelay (10);
wdenkaffae2b2002-08-17 09:36:01 +0000163
wdenkec4c5442004-02-09 23:12:24 +0000164 /* Now we can enable the Clock chip to initiate a new write */
165 immap->im_cpm.cp_pbdat |= PB_SPI_CE; /* Enable DS1306 Chip */
166 udelay (10);
wdenkaffae2b2002-08-17 09:36:01 +0000167
wdenkec4c5442004-02-09 23:12:24 +0000168 /* First we Enable write protect in the clock chip control register */
169 soft_spi_send (0x8F); /* send address of the control register */
170 soft_spi_send (0x40); /* send out Control Register contents */
wdenkaffae2b2002-08-17 09:36:01 +0000171
wdenkec4c5442004-02-09 23:12:24 +0000172 /* Now disable the DS1306 */
173 immap->im_cpm.cp_pbdat &= ~PB_SPI_CE; /* Disable DS1306 Chip */
174 udelay (10);
wdenkaffae2b2002-08-17 09:36:01 +0000175
wdenkec4c5442004-02-09 23:12:24 +0000176 /* Set standard MPC8xx clock to the same time so Linux will
177 * see the time even if it doesn't have a DS1306 clock driver.
178 * This helps with experimenting with standard kernels.
179 */
180 {
181 ulong tim;
wdenkaffae2b2002-08-17 09:36:01 +0000182
wdenkec4c5442004-02-09 23:12:24 +0000183 tim = mktime (tmp->tm_year, tmp->tm_mon, tmp->tm_mday,
184 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
wdenkaffae2b2002-08-17 09:36:01 +0000185
wdenkec4c5442004-02-09 23:12:24 +0000186 immap->im_sitk.sitk_rtck = KAPWR_KEY;
187 immap->im_sit.sit_rtc = tim;
188 }
wdenkaffae2b2002-08-17 09:36:01 +0000189
wdenkec4c5442004-02-09 23:12:24 +0000190 debug ("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
191 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
192 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
Jean-Christophe PLAGNIOL-VILLARDd1e23192008-09-01 23:06:23 +0200193
194 return 0;
wdenkaffae2b2002-08-17 09:36:01 +0000195}
196
197/* ------------------------------------------------------------------------- */
198
199/* Initialize Port B for software SPI */
wdenkec4c5442004-02-09 23:12:24 +0000200static void init_spi (void)
201{
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200202 volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
wdenkaffae2b2002-08-17 09:36:01 +0000203
wdenkec4c5442004-02-09 23:12:24 +0000204 /* Force output pins to begin at logic 0 */
205 immap->im_cpm.cp_pbdat &= ~(PB_SPI_CE | PB_SPIMOSI | PB_SPISCK);
wdenkaffae2b2002-08-17 09:36:01 +0000206
wdenkec4c5442004-02-09 23:12:24 +0000207 /* Set these 3 signals as outputs */
208 immap->im_cpm.cp_pbdir |= (PB_SPIMOSI | PB_SPI_CE | PB_SPISCK);
wdenkaffae2b2002-08-17 09:36:01 +0000209
wdenkec4c5442004-02-09 23:12:24 +0000210 immap->im_cpm.cp_pbdir &= ~PB_SPIMISO; /* Make MISO pin an input */
211 udelay (10);
wdenkaffae2b2002-08-17 09:36:01 +0000212}
213
214/* ------------------------------------------------------------------------- */
215
216/* NOTE: soft_spi_send() assumes that the I/O lines are configured already */
wdenkec4c5442004-02-09 23:12:24 +0000217static void soft_spi_send (unsigned char n)
wdenkaffae2b2002-08-17 09:36:01 +0000218{
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200219 volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
wdenkec4c5442004-02-09 23:12:24 +0000220 unsigned char bitpos; /* bit position to receive */
221 unsigned char i; /* Loop Control */
wdenkaffae2b2002-08-17 09:36:01 +0000222
wdenkec4c5442004-02-09 23:12:24 +0000223 /* bit position to send, start with most significant bit */
224 bitpos = 0x80;
wdenkaffae2b2002-08-17 09:36:01 +0000225
wdenkec4c5442004-02-09 23:12:24 +0000226 /* Send 8 bits to software SPI */
227 for (i = 0; i < 8; i++) { /* Loop for 8 bits */
228 immap->im_cpm.cp_pbdat |= PB_SPISCK; /* Raise SCK */
wdenkaffae2b2002-08-17 09:36:01 +0000229
wdenkec4c5442004-02-09 23:12:24 +0000230 if (n & bitpos)
231 immap->im_cpm.cp_pbdat |= PB_SPIMOSI; /* Set MOSI to 1 */
232 else
233 immap->im_cpm.cp_pbdat &= ~PB_SPIMOSI; /* Set MOSI to 0 */
234 udelay (10);
wdenkaffae2b2002-08-17 09:36:01 +0000235
wdenkec4c5442004-02-09 23:12:24 +0000236 immap->im_cpm.cp_pbdat &= ~PB_SPISCK; /* Lower SCK */
237 udelay (10);
wdenkaffae2b2002-08-17 09:36:01 +0000238
wdenkec4c5442004-02-09 23:12:24 +0000239 bitpos >>= 1; /* Shift for next bit position */
240 }
wdenkaffae2b2002-08-17 09:36:01 +0000241}
242
243/* ------------------------------------------------------------------------- */
244
245/* NOTE: soft_spi_read() assumes that the I/O lines are configured already */
wdenkec4c5442004-02-09 23:12:24 +0000246static unsigned char soft_spi_read (void)
wdenkaffae2b2002-08-17 09:36:01 +0000247{
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200248 volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
wdenkaffae2b2002-08-17 09:36:01 +0000249
wdenkec4c5442004-02-09 23:12:24 +0000250 unsigned char spi_byte = 0; /* Return value, assume success */
251 unsigned char bitpos; /* bit position to receive */
252 unsigned char i; /* Loop Control */
wdenkaffae2b2002-08-17 09:36:01 +0000253
wdenkec4c5442004-02-09 23:12:24 +0000254 /* bit position to receive, start with most significant bit */
255 bitpos = 0x80;
wdenkaffae2b2002-08-17 09:36:01 +0000256
wdenkec4c5442004-02-09 23:12:24 +0000257 /* Read 8 bits here */
258 for (i = 0; i < 8; i++) { /* Do 8 bits in loop */
259 immap->im_cpm.cp_pbdat |= PB_SPISCK; /* Raise SCK */
260 udelay (10);
261 if (immap->im_cpm.cp_pbdat & PB_SPIMISO) /* Get a bit of data */
262 spi_byte |= bitpos; /* Set data accordingly */
263 immap->im_cpm.cp_pbdat &= ~PB_SPISCK; /* Lower SCK */
264 udelay (10);
265 bitpos >>= 1; /* Shift for next bit position */
266 }
wdenkaffae2b2002-08-17 09:36:01 +0000267
wdenkec4c5442004-02-09 23:12:24 +0000268 return spi_byte; /* Return the byte read */
wdenkaffae2b2002-08-17 09:36:01 +0000269}
270
271/* ------------------------------------------------------------------------- */
272
wdenkec4c5442004-02-09 23:12:24 +0000273void rtc_reset (void)
274{
275 return; /* nothing to do */
276}
277
278#else /* not CONFIG_SXNI855T */
279/* ************************************************************************* */
280
wdenk3f85ce22004-02-23 16:11:30 +0000281static unsigned char rtc_read (unsigned char reg);
282static void rtc_write (unsigned char reg, unsigned char val);
283
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200284static struct spi_slave *slave;
285
wdenkec4c5442004-02-09 23:12:24 +0000286/* read clock time from DS1306 and return it in *tmp */
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +0300287int rtc_get (struct rtc_time *tmp)
wdenkec4c5442004-02-09 23:12:24 +0000288{
289 unsigned char sec, min, hour, mday, wday, mon, year;
290
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200291 /*
292 * Assuming Vcc = 2.0V (lowest speed)
293 *
294 * REVISIT: If we add an rtc_init() function we can do this
295 * step just once.
296 */
297 if (!slave) {
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200298 slave = spi_setup_slave(0, CONFIG_SYS_SPI_RTC_DEVID, 600000,
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200299 SPI_MODE_3 | SPI_CS_HIGH);
300 if (!slave)
301 return;
302 }
303
304 if (spi_claim_bus(slave))
305 return;
306
wdenkec4c5442004-02-09 23:12:24 +0000307 sec = rtc_read (RTC_SECONDS);
308 min = rtc_read (RTC_MINUTES);
309 hour = rtc_read (RTC_HOURS);
310 mday = rtc_read (RTC_DATE_OF_MONTH);
311 wday = rtc_read (RTC_DAY_OF_WEEK);
312 mon = rtc_read (RTC_MONTH);
313 year = rtc_read (RTC_YEAR);
314
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200315 spi_release_bus(slave);
316
wdenkec4c5442004-02-09 23:12:24 +0000317 debug ("Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
318 "hr: %02x min: %02x sec: %02x\n",
319 year, mon, mday, wday, hour, min, sec);
320 debug ("Alarms[0]: wday: %02x hour: %02x min: %02x sec: %02x\n",
321 rtc_read (RTC_DAY_OF_WEEK_ALARM0),
322 rtc_read (RTC_HOURS_ALARM0),
323 rtc_read (RTC_MINUTES_ALARM0), rtc_read (RTC_SECONDS_ALARM0));
324 debug ("Alarms[1]: wday: %02x hour: %02x min: %02x sec: %02x\n",
325 rtc_read (RTC_DAY_OF_WEEK_ALARM1),
326 rtc_read (RTC_HOURS_ALARM1),
327 rtc_read (RTC_MINUTES_ALARM1), rtc_read (RTC_SECONDS_ALARM1));
328
329 tmp->tm_sec = bcd2bin (sec & 0x7F); /* convert Seconds */
330 tmp->tm_min = bcd2bin (min & 0x7F); /* convert Minutes */
331
332 /* convert Hours */
333 tmp->tm_hour = (hour & 0x40)
334 ? ((hour & 0x20) /* 12 hour mode */
335 ? bcd2bin (hour & 0x1F) + 11 /* PM */
336 : bcd2bin (hour & 0x1F) - 1 /* AM */
337 )
338 : bcd2bin (hour & 0x3F); /* 24 hour mode */
339
340 tmp->tm_mday = bcd2bin (mday & 0x3F); /* convert Day of the Month */
341 tmp->tm_mon = bcd2bin (mon & 0x1F); /* convert Month */
342 tmp->tm_year = bcd2bin (year) + 2000; /* convert Year */
343 tmp->tm_wday = bcd2bin (wday & 0x07) - 1; /* convert Day of the Week */
344 tmp->tm_yday = 0;
345 tmp->tm_isdst = 0;
346
347 debug ("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
348 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
349 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +0300350
351 return 0;
wdenkec4c5442004-02-09 23:12:24 +0000352}
353
354/* ------------------------------------------------------------------------- */
355
356/* set clock time from *tmp in DS1306 RTC */
Jean-Christophe PLAGNIOL-VILLARDd1e23192008-09-01 23:06:23 +0200357int rtc_set (struct rtc_time *tmp)
wdenkec4c5442004-02-09 23:12:24 +0000358{
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200359 /* Assuming Vcc = 2.0V (lowest speed) */
360 if (!slave) {
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200361 slave = spi_setup_slave(0, CONFIG_SYS_SPI_RTC_DEVID, 600000,
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200362 SPI_MODE_3 | SPI_CS_HIGH);
363 if (!slave)
364 return;
365 }
366
367 if (spi_claim_bus(slave))
368 return;
369
wdenkec4c5442004-02-09 23:12:24 +0000370 debug ("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
371 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
372 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
373
wdenkec4c5442004-02-09 23:12:24 +0000374 rtc_write (RTC_SECONDS, bin2bcd (tmp->tm_sec));
Wolfgang Denkda4849f2006-05-03 01:04:58 +0200375 rtc_write (RTC_MINUTES, bin2bcd (tmp->tm_min));
376 rtc_write (RTC_HOURS, bin2bcd (tmp->tm_hour));
377 rtc_write (RTC_DAY_OF_WEEK, bin2bcd (tmp->tm_wday + 1));
378 rtc_write (RTC_DATE_OF_MONTH, bin2bcd (tmp->tm_mday));
379 rtc_write (RTC_MONTH, bin2bcd (tmp->tm_mon));
380 rtc_write (RTC_YEAR, bin2bcd (tmp->tm_year - 2000));
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200381
382 spi_release_bus(slave);
wdenkec4c5442004-02-09 23:12:24 +0000383}
384
385/* ------------------------------------------------------------------------- */
386
387/* reset the DS1306 */
388void rtc_reset (void)
389{
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200390 /* Assuming Vcc = 2.0V (lowest speed) */
391 if (!slave) {
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200392 slave = spi_setup_slave(0, CONFIG_SYS_SPI_RTC_DEVID, 600000,
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200393 SPI_MODE_3 | SPI_CS_HIGH);
394 if (!slave)
395 return;
396 }
397
398 if (spi_claim_bus(slave))
399 return;
400
wdenkec4c5442004-02-09 23:12:24 +0000401 /* clear the control register */
402 rtc_write (RTC_CONTROL, 0x00); /* 1st step: reset WP */
403 rtc_write (RTC_CONTROL, 0x00); /* 2nd step: reset 1Hz, AIE1, AIE0 */
404
405 /* reset all alarms */
406 rtc_write (RTC_SECONDS_ALARM0, 0x00);
407 rtc_write (RTC_SECONDS_ALARM1, 0x00);
408 rtc_write (RTC_MINUTES_ALARM0, 0x00);
409 rtc_write (RTC_MINUTES_ALARM1, 0x00);
410 rtc_write (RTC_HOURS_ALARM0, 0x00);
411 rtc_write (RTC_HOURS_ALARM1, 0x00);
412 rtc_write (RTC_DAY_OF_WEEK_ALARM0, 0x00);
413 rtc_write (RTC_DAY_OF_WEEK_ALARM1, 0x00);
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200414
415 spi_release_bus(slave);
wdenkec4c5442004-02-09 23:12:24 +0000416}
417
418/* ------------------------------------------------------------------------- */
419
420static unsigned char rtc_read (unsigned char reg)
421{
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200422 int ret;
wdenkec4c5442004-02-09 23:12:24 +0000423
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200424 ret = spi_w8r8(slave, reg);
425 return ret < 0 ? 0 : ret;
wdenkec4c5442004-02-09 23:12:24 +0000426}
427
428/* ------------------------------------------------------------------------- */
429
430static void rtc_write (unsigned char reg, unsigned char val)
431{
432 unsigned char dout[2]; /* SPI Output Data Bytes */
433 unsigned char din[2]; /* SPI Input Data Bytes */
434
435 dout[0] = 0x80 | reg;
436 dout[1] = val;
437
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200438 spi_xfer (slave, 16, dout, din, SPI_XFER_BEGIN | SPI_XFER_END);
wdenkec4c5442004-02-09 23:12:24 +0000439}
440
441#endif /* end of code exclusion (see #ifdef CONFIG_SXNI855T above) */
442
wdenkaffae2b2002-08-17 09:36:01 +0000443#endif