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Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -07001/*
2 * Ricoh RS5C313 RTC device/driver
3 * Copyright (C) 2007 Nobuhiro Iwamatsu
4 *
5 * 2005-09-19 modifed by kogiidena
6 *
7 * Based on the old drivers/char/rs5c313_rtc.c by:
8 * Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
9 * Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka
10 *
11 * Based on code written by Paul Gortmaker.
12 * Copyright (C) 1996 Paul Gortmaker
13 *
14 * This file is subject to the terms and conditions of the GNU General Public
15 * License. See the file "COPYING" in the main directory of this archive
16 * for more details.
17 *
18 * Based on other minimal char device drivers, like Alan's
19 * watchdog, Ted's random, etc. etc.
20 *
21 * 1.07 Paul Gortmaker.
22 * 1.08 Miquel van Smoorenburg: disallow certain things on the
23 * DEC Alpha as the CMOS clock is also used for other things.
24 * 1.09 Nikita Schmidt: epoch support and some Alpha cleanup.
25 * 1.09a Pete Zaitcev: Sun SPARC
26 * 1.09b Jeff Garzik: Modularize, init cleanup
27 * 1.09c Jeff Garzik: SMP cleanup
28 * 1.10 Paul Barton-Davis: add support for async I/O
29 * 1.10a Andrea Arcangeli: Alpha updates
30 * 1.10b Andrew Morton: SMP lock fix
31 * 1.10c Cesar Barros: SMP locking fixes and cleanup
32 * 1.10d Paul Gortmaker: delete paranoia check in rtc_exit
33 * 1.10e Maciej W. Rozycki: Handle DECstation's year weirdness.
34 * 1.11 Takashi Iwai: Kernel access functions
35 * rtc_register/rtc_unregister/rtc_control
36 * 1.11a Daniele Bellucci: Audit create_proc_read_entry in rtc_init
37 * 1.12 Venkatesh Pallipadi: Hooks for emulating rtc on HPET base-timer
38 * CONFIG_HPET_EMULATE_RTC
39 * 1.13 Nobuhiro Iwamatsu: Updata driver.
40 */
41
Jingoo Hanaa161902013-02-21 16:45:29 -080042#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
43
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -070044#include <linux/module.h>
45#include <linux/err.h>
46#include <linux/rtc.h>
47#include <linux/platform_device.h>
48#include <linux/bcd.h>
49#include <linux/delay.h>
Sachin Kamat91b80e42013-07-03 15:06:03 -070050#include <linux/io.h>
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -070051
52#define DRV_NAME "rs5c313"
Sachin Kamat675090f2013-07-03 15:06:04 -070053#define DRV_VERSION "1.13"
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -070054
55#ifdef CONFIG_SH_LANDISK
56/*****************************************************/
57/* LANDISK dependence part of RS5C313 */
58/*****************************************************/
59
60#define SCSMR1 0xFFE00000
61#define SCSCR1 0xFFE00008
62#define SCSMR1_CA 0x80
63#define SCSCR1_CKE 0x03
64#define SCSPTR1 0xFFE0001C
65#define SCSPTR1_EIO 0x80
66#define SCSPTR1_SPB1IO 0x08
67#define SCSPTR1_SPB1DT 0x04
68#define SCSPTR1_SPB0IO 0x02
69#define SCSPTR1_SPB0DT 0x01
70
71#define SDA_OEN SCSPTR1_SPB1IO
72#define SDA SCSPTR1_SPB1DT
73#define SCL_OEN SCSPTR1_SPB0IO
74#define SCL SCSPTR1_SPB0DT
75
76/* RICOH RS5C313 CE port */
77#define RS5C313_CE 0xB0000003
78
79/* RICOH RS5C313 CE port bit */
80#define RS5C313_CE_RTCCE 0x02
81
82/* SCSPTR1 data */
83unsigned char scsptr1_data;
84
Paul Mundt071a1e32010-10-27 15:30:32 +090085#define RS5C313_CEENABLE __raw_writeb(RS5C313_CE_RTCCE, RS5C313_CE);
86#define RS5C313_CEDISABLE __raw_writeb(0x00, RS5C313_CE)
87#define RS5C313_MISCOP __raw_writeb(0x02, 0xB0000008)
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -070088
89static void rs5c313_init_port(void)
90{
91 /* Set SCK as I/O port and Initialize SCSPTR1 data & I/O port. */
Paul Mundt071a1e32010-10-27 15:30:32 +090092 __raw_writeb(__raw_readb(SCSMR1) & ~SCSMR1_CA, SCSMR1);
93 __raw_writeb(__raw_readb(SCSCR1) & ~SCSCR1_CKE, SCSCR1);
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -070094
95 /* And Initialize SCL for RS5C313 clock */
Paul Mundt071a1e32010-10-27 15:30:32 +090096 scsptr1_data = __raw_readb(SCSPTR1) | SCL; /* SCL:H */
97 __raw_writeb(scsptr1_data, SCSPTR1);
98 scsptr1_data = __raw_readb(SCSPTR1) | SCL_OEN; /* SCL output enable */
99 __raw_writeb(scsptr1_data, SCSPTR1);
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700100 RS5C313_CEDISABLE; /* CE:L */
101}
102
103static void rs5c313_write_data(unsigned char data)
104{
105 int i;
106
107 for (i = 0; i < 8; i++) {
108 /* SDA:Write Data */
109 scsptr1_data = (scsptr1_data & ~SDA) |
110 ((((0x80 >> i) & data) >> (7 - i)) << 2);
Paul Mundt071a1e32010-10-27 15:30:32 +0900111 __raw_writeb(scsptr1_data, SCSPTR1);
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700112 if (i == 0) {
113 scsptr1_data |= SDA_OEN; /* SDA:output enable */
Paul Mundt071a1e32010-10-27 15:30:32 +0900114 __raw_writeb(scsptr1_data, SCSPTR1);
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700115 }
116 ndelay(700);
117 scsptr1_data &= ~SCL; /* SCL:L */
Paul Mundt071a1e32010-10-27 15:30:32 +0900118 __raw_writeb(scsptr1_data, SCSPTR1);
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700119 ndelay(700);
120 scsptr1_data |= SCL; /* SCL:H */
Paul Mundt071a1e32010-10-27 15:30:32 +0900121 __raw_writeb(scsptr1_data, SCSPTR1);
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700122 }
123
124 scsptr1_data &= ~SDA_OEN; /* SDA:output disable */
Paul Mundt071a1e32010-10-27 15:30:32 +0900125 __raw_writeb(scsptr1_data, SCSPTR1);
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700126}
127
128static unsigned char rs5c313_read_data(void)
129{
130 int i;
kogiidena9a3f1d52007-05-10 22:22:54 -0700131 unsigned char data = 0;
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700132
133 for (i = 0; i < 8; i++) {
134 ndelay(700);
135 /* SDA:Read Data */
Paul Mundt071a1e32010-10-27 15:30:32 +0900136 data |= ((__raw_readb(SCSPTR1) & SDA) >> 2) << (7 - i);
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700137 scsptr1_data &= ~SCL; /* SCL:L */
Paul Mundt071a1e32010-10-27 15:30:32 +0900138 __raw_writeb(scsptr1_data, SCSPTR1);
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700139 ndelay(700);
140 scsptr1_data |= SCL; /* SCL:H */
Paul Mundt071a1e32010-10-27 15:30:32 +0900141 __raw_writeb(scsptr1_data, SCSPTR1);
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700142 }
143 return data & 0x0F;
144}
145
146#endif /* CONFIG_SH_LANDISK */
147
148/*****************************************************/
149/* machine independence part of RS5C313 */
150/*****************************************************/
151
152/* RICOH RS5C313 address */
153#define RS5C313_ADDR_SEC 0x00
154#define RS5C313_ADDR_SEC10 0x01
155#define RS5C313_ADDR_MIN 0x02
156#define RS5C313_ADDR_MIN10 0x03
157#define RS5C313_ADDR_HOUR 0x04
158#define RS5C313_ADDR_HOUR10 0x05
159#define RS5C313_ADDR_WEEK 0x06
160#define RS5C313_ADDR_INTINTVREG 0x07
161#define RS5C313_ADDR_DAY 0x08
162#define RS5C313_ADDR_DAY10 0x09
163#define RS5C313_ADDR_MON 0x0A
164#define RS5C313_ADDR_MON10 0x0B
165#define RS5C313_ADDR_YEAR 0x0C
166#define RS5C313_ADDR_YEAR10 0x0D
167#define RS5C313_ADDR_CNTREG 0x0E
168#define RS5C313_ADDR_TESTREG 0x0F
169
170/* RICOH RS5C313 control register */
171#define RS5C313_CNTREG_ADJ_BSY 0x01
172#define RS5C313_CNTREG_WTEN_XSTP 0x02
173#define RS5C313_CNTREG_12_24 0x04
174#define RS5C313_CNTREG_CTFG 0x08
175
176/* RICOH RS5C313 test register */
177#define RS5C313_TESTREG_TEST 0x01
178
179/* RICOH RS5C313 control bit */
180#define RS5C313_CNTBIT_READ 0x40
181#define RS5C313_CNTBIT_AD 0x20
182#define RS5C313_CNTBIT_DT 0x10
183
184static unsigned char rs5c313_read_reg(unsigned char addr)
185{
186
187 rs5c313_write_data(addr | RS5C313_CNTBIT_READ | RS5C313_CNTBIT_AD);
188 return rs5c313_read_data();
189}
190
191static void rs5c313_write_reg(unsigned char addr, unsigned char data)
192{
193 data &= 0x0f;
194 rs5c313_write_data(addr | RS5C313_CNTBIT_AD);
195 rs5c313_write_data(data | RS5C313_CNTBIT_DT);
196 return;
197}
198
kogiidena9a3f1d52007-05-10 22:22:54 -0700199static inline unsigned char rs5c313_read_cntreg(void)
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700200{
201 return rs5c313_read_reg(RS5C313_ADDR_CNTREG);
202}
203
204static inline void rs5c313_write_cntreg(unsigned char data)
205{
206 rs5c313_write_reg(RS5C313_ADDR_CNTREG, data);
207}
208
209static inline void rs5c313_write_intintvreg(unsigned char data)
210{
211 rs5c313_write_reg(RS5C313_ADDR_INTINTVREG, data);
212}
213
214static int rs5c313_rtc_read_time(struct device *dev, struct rtc_time *tm)
215{
216 int data;
kogiidena4ac24b32007-05-10 22:22:57 -0700217 int cnt;
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700218
kogiidena4ac24b32007-05-10 22:22:57 -0700219 cnt = 0;
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700220 while (1) {
221 RS5C313_CEENABLE; /* CE:H */
222
223 /* Initialize control reg. 24 hour */
224 rs5c313_write_cntreg(0x04);
225
226 if (!(rs5c313_read_cntreg() & RS5C313_CNTREG_ADJ_BSY))
227 break;
228
229 RS5C313_CEDISABLE;
230 ndelay(700); /* CE:L */
231
kogiidena4ac24b32007-05-10 22:22:57 -0700232 if (cnt++ > 100) {
Harvey Harrison2a4e2b8782008-04-28 02:12:00 -0700233 dev_err(dev, "%s: timeout error\n", __func__);
kogiidena4ac24b32007-05-10 22:22:57 -0700234 return -EIO;
235 }
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700236 }
237
238 data = rs5c313_read_reg(RS5C313_ADDR_SEC);
239 data |= (rs5c313_read_reg(RS5C313_ADDR_SEC10) << 4);
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700240 tm->tm_sec = bcd2bin(data);
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700241
242 data = rs5c313_read_reg(RS5C313_ADDR_MIN);
243 data |= (rs5c313_read_reg(RS5C313_ADDR_MIN10) << 4);
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700244 tm->tm_min = bcd2bin(data);
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700245
246 data = rs5c313_read_reg(RS5C313_ADDR_HOUR);
247 data |= (rs5c313_read_reg(RS5C313_ADDR_HOUR10) << 4);
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700248 tm->tm_hour = bcd2bin(data);
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700249
250 data = rs5c313_read_reg(RS5C313_ADDR_DAY);
251 data |= (rs5c313_read_reg(RS5C313_ADDR_DAY10) << 4);
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700252 tm->tm_mday = bcd2bin(data);
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700253
254 data = rs5c313_read_reg(RS5C313_ADDR_MON);
255 data |= (rs5c313_read_reg(RS5C313_ADDR_MON10) << 4);
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700256 tm->tm_mon = bcd2bin(data) - 1;
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700257
258 data = rs5c313_read_reg(RS5C313_ADDR_YEAR);
259 data |= (rs5c313_read_reg(RS5C313_ADDR_YEAR10) << 4);
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700260 tm->tm_year = bcd2bin(data);
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700261
262 if (tm->tm_year < 70)
263 tm->tm_year += 100;
264
265 data = rs5c313_read_reg(RS5C313_ADDR_WEEK);
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700266 tm->tm_wday = bcd2bin(data);
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700267
268 RS5C313_CEDISABLE;
269 ndelay(700); /* CE:L */
270
271 return 0;
272}
273
274static int rs5c313_rtc_set_time(struct device *dev, struct rtc_time *tm)
275{
276 int data;
kogiidena4ac24b32007-05-10 22:22:57 -0700277 int cnt;
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700278
kogiidena4ac24b32007-05-10 22:22:57 -0700279 cnt = 0;
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700280 /* busy check. */
281 while (1) {
282 RS5C313_CEENABLE; /* CE:H */
283
284 /* Initiatlize control reg. 24 hour */
285 rs5c313_write_cntreg(0x04);
286
287 if (!(rs5c313_read_cntreg() & RS5C313_CNTREG_ADJ_BSY))
288 break;
289 RS5C313_MISCOP;
290 RS5C313_CEDISABLE;
291 ndelay(700); /* CE:L */
kogiidena4ac24b32007-05-10 22:22:57 -0700292
293 if (cnt++ > 100) {
Harvey Harrison2a4e2b8782008-04-28 02:12:00 -0700294 dev_err(dev, "%s: timeout error\n", __func__);
kogiidena4ac24b32007-05-10 22:22:57 -0700295 return -EIO;
296 }
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700297 }
298
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700299 data = bin2bcd(tm->tm_sec);
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700300 rs5c313_write_reg(RS5C313_ADDR_SEC, data);
301 rs5c313_write_reg(RS5C313_ADDR_SEC10, (data >> 4));
302
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700303 data = bin2bcd(tm->tm_min);
Sachin Kamat675090f2013-07-03 15:06:04 -0700304 rs5c313_write_reg(RS5C313_ADDR_MIN, data);
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700305 rs5c313_write_reg(RS5C313_ADDR_MIN10, (data >> 4));
306
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700307 data = bin2bcd(tm->tm_hour);
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700308 rs5c313_write_reg(RS5C313_ADDR_HOUR, data);
309 rs5c313_write_reg(RS5C313_ADDR_HOUR10, (data >> 4));
310
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700311 data = bin2bcd(tm->tm_mday);
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700312 rs5c313_write_reg(RS5C313_ADDR_DAY, data);
Sachin Kamat675090f2013-07-03 15:06:04 -0700313 rs5c313_write_reg(RS5C313_ADDR_DAY10, (data >> 4));
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700314
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700315 data = bin2bcd(tm->tm_mon + 1);
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700316 rs5c313_write_reg(RS5C313_ADDR_MON, data);
317 rs5c313_write_reg(RS5C313_ADDR_MON10, (data >> 4));
318
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700319 data = bin2bcd(tm->tm_year % 100);
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700320 rs5c313_write_reg(RS5C313_ADDR_YEAR, data);
321 rs5c313_write_reg(RS5C313_ADDR_YEAR10, (data >> 4));
322
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700323 data = bin2bcd(tm->tm_wday);
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700324 rs5c313_write_reg(RS5C313_ADDR_WEEK, data);
325
326 RS5C313_CEDISABLE; /* CE:H */
327 ndelay(700);
328
329 return 0;
330}
331
332static void rs5c313_check_xstp_bit(void)
333{
334 struct rtc_time tm;
kogiidena4ac24b32007-05-10 22:22:57 -0700335 int cnt;
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700336
337 RS5C313_CEENABLE; /* CE:H */
338 if (rs5c313_read_cntreg() & RS5C313_CNTREG_WTEN_XSTP) {
339 /* INT interval reg. OFF */
340 rs5c313_write_intintvreg(0x00);
341 /* Initialize control reg. 24 hour & adjust */
342 rs5c313_write_cntreg(0x07);
343
344 /* busy check. */
kogiidena4ac24b32007-05-10 22:22:57 -0700345 for (cnt = 0; cnt < 100; cnt++) {
346 if (!(rs5c313_read_cntreg() & RS5C313_CNTREG_ADJ_BSY))
347 break;
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700348 RS5C313_MISCOP;
kogiidena4ac24b32007-05-10 22:22:57 -0700349 }
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700350
351 memset(&tm, 0, sizeof(struct rtc_time));
Sachin Kamat675090f2013-07-03 15:06:04 -0700352 tm.tm_mday = 1;
353 tm.tm_mon = 1 - 1;
354 tm.tm_year = 2000 - 1900;
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700355
356 rs5c313_rtc_set_time(NULL, &tm);
Jingoo Hanaa161902013-02-21 16:45:29 -0800357 pr_err("invalid value, resetting to 1 Jan 2000\n");
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700358 }
359 RS5C313_CEDISABLE;
360 ndelay(700); /* CE:L */
361}
362
363static const struct rtc_class_ops rs5c313_rtc_ops = {
364 .read_time = rs5c313_rtc_read_time,
365 .set_time = rs5c313_rtc_set_time,
366};
367
368static int rs5c313_rtc_probe(struct platform_device *pdev)
369{
Jingoo Han284e2fa2013-04-29 16:19:47 -0700370 struct rtc_device *rtc = devm_rtc_device_register(&pdev->dev, "rs5c313",
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700371 &rs5c313_rtc_ops, THIS_MODULE);
372
373 if (IS_ERR(rtc))
374 return PTR_ERR(rtc);
375
376 platform_set_drvdata(pdev, rtc);
377
kogiidena9a3f1d52007-05-10 22:22:54 -0700378 return 0;
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700379}
380
Greg Kroah-Hartman5a167f42012-12-21 13:09:38 -0800381static int rs5c313_rtc_remove(struct platform_device *pdev)
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700382{
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700383 return 0;
384}
385
386static struct platform_driver rs5c313_rtc_platform_driver = {
387 .driver = {
388 .name = DRV_NAME,
389 .owner = THIS_MODULE,
390 },
Sachin Kamat675090f2013-07-03 15:06:04 -0700391 .probe = rs5c313_rtc_probe,
Greg Kroah-Hartman5a167f42012-12-21 13:09:38 -0800392 .remove = rs5c313_rtc_remove,
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700393};
394
395static int __init rs5c313_rtc_init(void)
396{
397 int err;
398
399 err = platform_driver_register(&rs5c313_rtc_platform_driver);
400 if (err)
401 return err;
402
403 rs5c313_init_port();
404 rs5c313_check_xstp_bit();
405
406 return 0;
407}
408
409static void __exit rs5c313_rtc_exit(void)
410{
Sachin Kamat675090f2013-07-03 15:06:04 -0700411 platform_driver_unregister(&rs5c313_rtc_platform_driver);
Nobuhiro Iwamatsue9f2bd82007-05-08 00:26:37 -0700412}
413
414module_init(rs5c313_rtc_init);
415module_exit(rs5c313_rtc_exit);
416
417MODULE_VERSION(DRV_VERSION);
418MODULE_AUTHOR("kogiidena , Nobuhiro Iwamatsu <iwamatsu@nigauri.org>");
419MODULE_DESCRIPTION("Ricoh RS5C313 RTC device driver");
420MODULE_LICENSE("GPL");
Kay Sieversad28a072008-04-10 21:29:25 -0700421MODULE_ALIAS("platform:" DRV_NAME);