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-rw-r--r--drivers/rtc/Kconfig13
-rw-r--r--drivers/rtc/Makefile1
-rw-r--r--drivers/rtc/rtc-ds1553.c2
-rw-r--r--drivers/rtc/rtc-ds1742.c2
-rw-r--r--drivers/rtc/rtc-max6900.c96
-rw-r--r--drivers/rtc/rtc-stk17ta8.c420
6 files changed, 508 insertions, 26 deletions
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 35f34665e3c4..9d8d40d5c8f7 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -38,6 +38,9 @@ config RTC_HCTOSYS_DEVICE
38 clock, usually rtc0. Initialization is done when the system 38 clock, usually rtc0. Initialization is done when the system
39 starts up, and when it resumes from a low power state. 39 starts up, and when it resumes from a low power state.
40 40
41 The driver for this RTC device must be loaded before late_initcall
42 functions run, so it must usually be statically linked.
43
41 This clock should be battery-backed, so that it reads the correct 44 This clock should be battery-backed, so that it reads the correct
42 time when the system boots from a power-off state. Otherwise, your 45 time when the system boots from a power-off state. Otherwise, your
43 system will need an external clock source (like an NTP server). 46 system will need an external clock source (like an NTP server).
@@ -305,6 +308,16 @@ config RTC_DRV_DS1553
305 This driver can also be built as a module. If so, the module 308 This driver can also be built as a module. If so, the module
306 will be called rtc-ds1553. 309 will be called rtc-ds1553.
307 310
311config RTC_DRV_STK17TA8
312 tristate "Simtek STK17TA8"
313 depends on RTC_CLASS
314 help
315 If you say yes here you get support for the
316 Simtek STK17TA8 timekeeping chip.
317
318 This driver can also be built as a module. If so, the module
319 will be called rtc-stk17ta8.
320
308config RTC_DRV_DS1742 321config RTC_DRV_DS1742
309 tristate "Dallas DS1742/1743" 322 tristate "Dallas DS1742/1743"
310 depends on RTC_CLASS 323 depends on RTC_CLASS
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 3109af9a1651..7ede9e725360 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -32,6 +32,7 @@ obj-$(CONFIG_RTC_DRV_RS5C348) += rtc-rs5c348.o
32obj-$(CONFIG_RTC_DRV_M41T80) += rtc-m41t80.o 32obj-$(CONFIG_RTC_DRV_M41T80) += rtc-m41t80.o
33obj-$(CONFIG_RTC_DRV_M48T86) += rtc-m48t86.o 33obj-$(CONFIG_RTC_DRV_M48T86) += rtc-m48t86.o
34obj-$(CONFIG_RTC_DRV_DS1553) += rtc-ds1553.o 34obj-$(CONFIG_RTC_DRV_DS1553) += rtc-ds1553.o
35obj-$(CONFIG_RTC_DRV_STK17TA8) += rtc-stk17ta8.o
35obj-$(CONFIG_RTC_DRV_RS5C313) += rtc-rs5c313.o 36obj-$(CONFIG_RTC_DRV_RS5C313) += rtc-rs5c313.o
36obj-$(CONFIG_RTC_DRV_EP93XX) += rtc-ep93xx.o 37obj-$(CONFIG_RTC_DRV_EP93XX) += rtc-ep93xx.o
37obj-$(CONFIG_RTC_DRV_SA1100) += rtc-sa1100.o 38obj-$(CONFIG_RTC_DRV_SA1100) += rtc-sa1100.o
diff --git a/drivers/rtc/rtc-ds1553.c b/drivers/rtc/rtc-ds1553.c
index f98a83a11aae..46da5714932c 100644
--- a/drivers/rtc/rtc-ds1553.c
+++ b/drivers/rtc/rtc-ds1553.c
@@ -407,7 +407,7 @@ static __init int ds1553_init(void)
407 407
408static __exit void ds1553_exit(void) 408static __exit void ds1553_exit(void)
409{ 409{
410 return platform_driver_unregister(&ds1553_rtc_driver); 410 platform_driver_unregister(&ds1553_rtc_driver);
411} 411}
412 412
413module_init(ds1553_init); 413module_init(ds1553_init);
diff --git a/drivers/rtc/rtc-ds1742.c b/drivers/rtc/rtc-ds1742.c
index d1778ae8bca5..b2e5481ba3b6 100644
--- a/drivers/rtc/rtc-ds1742.c
+++ b/drivers/rtc/rtc-ds1742.c
@@ -263,7 +263,7 @@ static __init int ds1742_init(void)
263 263
264static __exit void ds1742_exit(void) 264static __exit void ds1742_exit(void)
265{ 265{
266 return platform_driver_unregister(&ds1742_rtc_driver); 266 platform_driver_unregister(&ds1742_rtc_driver);
267} 267}
268 268
269module_init(ds1742_init); 269module_init(ds1742_init);
diff --git a/drivers/rtc/rtc-max6900.c b/drivers/rtc/rtc-max6900.c
index eee4ee5bb75a..a1cd448639c9 100644
--- a/drivers/rtc/rtc-max6900.c
+++ b/drivers/rtc/rtc-max6900.c
@@ -31,17 +31,24 @@
31#define MAX6900_REG_DW 5 /* day of week 1-7 */ 31#define MAX6900_REG_DW 5 /* day of week 1-7 */
32#define MAX6900_REG_YR 6 /* year 00-99 */ 32#define MAX6900_REG_YR 6 /* year 00-99 */
33#define MAX6900_REG_CT 7 /* control */ 33#define MAX6900_REG_CT 7 /* control */
34#define MAX6900_REG_LEN 8 34 /* register 8 is undocumented */
35#define MAX6900_REG_CENTURY 9 /* century */
36#define MAX6900_REG_LEN 10
37
38#define MAX6900_BURST_LEN 8 /* can burst r/w first 8 regs */
35 39
36#define MAX6900_REG_CT_WP (1 << 7) /* Write Protect */ 40#define MAX6900_REG_CT_WP (1 << 7) /* Write Protect */
37 41
42
38/* 43/*
39 * register read/write commands 44 * register read/write commands
40 */ 45 */
41#define MAX6900_REG_CONTROL_WRITE 0x8e 46#define MAX6900_REG_CONTROL_WRITE 0x8e
42#define MAX6900_REG_BURST_READ 0xbf 47#define MAX6900_REG_CENTURY_WRITE 0x92
43#define MAX6900_REG_BURST_WRITE 0xbe 48#define MAX6900_REG_CENTURY_READ 0x93
44#define MAX6900_REG_RESERVED_READ 0x96 49#define MAX6900_REG_RESERVED_READ 0x96
50#define MAX6900_REG_BURST_WRITE 0xbe
51#define MAX6900_REG_BURST_READ 0xbf
45 52
46#define MAX6900_IDLE_TIME_AFTER_WRITE 3 /* specification says 2.5 mS */ 53#define MAX6900_IDLE_TIME_AFTER_WRITE 3 /* specification says 2.5 mS */
47 54
@@ -58,19 +65,32 @@ static int max6900_probe(struct i2c_adapter *adapter, int addr, int kind);
58 65
59static int max6900_i2c_read_regs(struct i2c_client *client, u8 *buf) 66static int max6900_i2c_read_regs(struct i2c_client *client, u8 *buf)
60{ 67{
61 u8 reg_addr[1] = { MAX6900_REG_BURST_READ }; 68 u8 reg_burst_read[1] = { MAX6900_REG_BURST_READ };
62 struct i2c_msg msgs[2] = { 69 u8 reg_century_read[1] = { MAX6900_REG_CENTURY_READ };
70 struct i2c_msg msgs[4] = {
63 { 71 {
64 .addr = client->addr, 72 .addr = client->addr,
65 .flags = 0, /* write */ 73 .flags = 0, /* write */
66 .len = sizeof(reg_addr), 74 .len = sizeof(reg_burst_read),
67 .buf = reg_addr 75 .buf = reg_burst_read
68 }, 76 },
69 { 77 {
70 .addr = client->addr, 78 .addr = client->addr,
71 .flags = I2C_M_RD, 79 .flags = I2C_M_RD,
72 .len = MAX6900_REG_LEN, 80 .len = MAX6900_BURST_LEN,
73 .buf = buf 81 .buf = buf
82 },
83 {
84 .addr = client->addr,
85 .flags = 0, /* write */
86 .len = sizeof(reg_century_read),
87 .buf = reg_century_read
88 },
89 {
90 .addr = client->addr,
91 .flags = I2C_M_RD,
92 .len = sizeof(buf[MAX6900_REG_CENTURY]),
93 .buf = &buf[MAX6900_REG_CENTURY]
74 } 94 }
75 }; 95 };
76 int rc; 96 int rc;
@@ -86,33 +106,58 @@ static int max6900_i2c_read_regs(struct i2c_client *client, u8 *buf)
86 106
87static int max6900_i2c_write_regs(struct i2c_client *client, u8 const *buf) 107static int max6900_i2c_write_regs(struct i2c_client *client, u8 const *buf)
88{ 108{
89 u8 i2c_buf[MAX6900_REG_LEN + 1] = { MAX6900_REG_BURST_WRITE }; 109 u8 i2c_century_buf[1 + 1] = { MAX6900_REG_CENTURY_WRITE };
90 struct i2c_msg msgs[1] = { 110 struct i2c_msg century_msgs[1] = {
91 { 111 {
92 .addr = client->addr, 112 .addr = client->addr,
93 .flags = 0, /* write */ 113 .flags = 0, /* write */
94 .len = MAX6900_REG_LEN + 1, 114 .len = sizeof(i2c_century_buf),
95 .buf = i2c_buf 115 .buf = i2c_century_buf
116 }
117 };
118 u8 i2c_burst_buf[MAX6900_BURST_LEN + 1] = { MAX6900_REG_BURST_WRITE };
119 struct i2c_msg burst_msgs[1] = {
120 {
121 .addr = client->addr,
122 .flags = 0, /* write */
123 .len = sizeof(i2c_burst_buf),
124 .buf = i2c_burst_buf
96 } 125 }
97 }; 126 };
98 int rc; 127 int rc;
99 128
100 memcpy(&i2c_buf[1], buf, MAX6900_REG_LEN); 129 /*
130 * We have to make separate calls to i2c_transfer because of
131 * the need to delay after each write to the chip. Also,
132 * we write the century byte first, since we set the write-protect
133 * bit as part of the burst write.
134 */
135 i2c_century_buf[1] = buf[MAX6900_REG_CENTURY];
136 rc = i2c_transfer(client->adapter, century_msgs,
137 ARRAY_SIZE(century_msgs));
138 if (rc != ARRAY_SIZE(century_msgs))
139 goto write_failed;
140 msleep(MAX6900_IDLE_TIME_AFTER_WRITE);
101 141
102 rc = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); 142 memcpy(&i2c_burst_buf[1], buf, MAX6900_BURST_LEN);
103 if (rc != ARRAY_SIZE(msgs)) { 143
104 dev_err(&client->dev, "%s: register write failed\n", 144 rc = i2c_transfer(client->adapter, burst_msgs, ARRAY_SIZE(burst_msgs));
105 __FUNCTION__); 145 if (rc != ARRAY_SIZE(burst_msgs))
106 return -EIO; 146 goto write_failed;
107 }
108 msleep(MAX6900_IDLE_TIME_AFTER_WRITE); 147 msleep(MAX6900_IDLE_TIME_AFTER_WRITE);
148
109 return 0; 149 return 0;
150
151write_failed:
152 dev_err(&client->dev, "%s: register write failed\n",
153 __FUNCTION__);
154 return -EIO;
110} 155}
111 156
112static int max6900_i2c_validate_client(struct i2c_client *client) 157static int max6900_i2c_validate_client(struct i2c_client *client)
113{ 158{
114 u8 regs[MAX6900_REG_LEN]; 159 u8 regs[MAX6900_REG_LEN];
115 u8 zero_mask[MAX6900_REG_LEN] = { 160 u8 zero_mask[] = {
116 0x80, /* seconds */ 161 0x80, /* seconds */
117 0x80, /* minutes */ 162 0x80, /* minutes */
118 0x40, /* hours */ 163 0x40, /* hours */
@@ -134,7 +179,7 @@ static int max6900_i2c_validate_client(struct i2c_client *client)
134 if (rc < 0) 179 if (rc < 0)
135 return rc; 180 return rc;
136 181
137 for (i = 0; i < MAX6900_REG_LEN; ++i) { 182 for (i = 0; i < ARRAY_SIZE(zero_mask); ++i) {
138 if (regs[i] & zero_mask[i]) 183 if (regs[i] & zero_mask[i])
139 return -ENODEV; 184 return -ENODEV;
140 } 185 }
@@ -156,7 +201,8 @@ static int max6900_i2c_read_time(struct i2c_client *client, struct rtc_time *tm)
156 tm->tm_hour = BCD2BIN(regs[MAX6900_REG_HR] & 0x3f); 201 tm->tm_hour = BCD2BIN(regs[MAX6900_REG_HR] & 0x3f);
157 tm->tm_mday = BCD2BIN(regs[MAX6900_REG_DT]); 202 tm->tm_mday = BCD2BIN(regs[MAX6900_REG_DT]);
158 tm->tm_mon = BCD2BIN(regs[MAX6900_REG_MO]) - 1; 203 tm->tm_mon = BCD2BIN(regs[MAX6900_REG_MO]) - 1;
159 tm->tm_year = BCD2BIN(regs[MAX6900_REG_YR]) + 100; 204 tm->tm_year = BCD2BIN(regs[MAX6900_REG_YR]) +
205 BCD2BIN(regs[MAX6900_REG_CENTURY]) * 100 - 1900;
160 tm->tm_wday = BCD2BIN(regs[MAX6900_REG_DW]); 206 tm->tm_wday = BCD2BIN(regs[MAX6900_REG_DW]);
161 207
162 return 0; 208 return 0;
@@ -189,9 +235,11 @@ static int max6900_i2c_set_time(struct i2c_client *client,
189 regs[MAX6900_REG_HR] = BIN2BCD(tm->tm_hour); 235 regs[MAX6900_REG_HR] = BIN2BCD(tm->tm_hour);
190 regs[MAX6900_REG_DT] = BIN2BCD(tm->tm_mday); 236 regs[MAX6900_REG_DT] = BIN2BCD(tm->tm_mday);
191 regs[MAX6900_REG_MO] = BIN2BCD(tm->tm_mon + 1); 237 regs[MAX6900_REG_MO] = BIN2BCD(tm->tm_mon + 1);
192 regs[MAX6900_REG_YR] = BIN2BCD(tm->tm_year - 100);
193 regs[MAX6900_REG_DW] = BIN2BCD(tm->tm_wday); 238 regs[MAX6900_REG_DW] = BIN2BCD(tm->tm_wday);
194 regs[MAX6900_REG_CT] = MAX6900_REG_CT_WP; /* set write protect */ 239 regs[MAX6900_REG_YR] = BIN2BCD(tm->tm_year % 100);
240 regs[MAX6900_REG_CENTURY] = BIN2BCD((tm->tm_year + 1900) / 100);
241 /* set write protect */
242 regs[MAX6900_REG_CT] = MAX6900_REG_CT_WP;
195 243
196 rc = max6900_i2c_write_regs(client, regs); 244 rc = max6900_i2c_write_regs(client, regs);
197 if (rc < 0) 245 if (rc < 0)
diff --git a/drivers/rtc/rtc-stk17ta8.c b/drivers/rtc/rtc-stk17ta8.c
new file mode 100644
index 000000000000..f10d3facecbe
--- /dev/null
+++ b/drivers/rtc/rtc-stk17ta8.c
@@ -0,0 +1,420 @@
1/*
2 * A RTC driver for the Simtek STK17TA8
3 *
4 * By Thomas Hommel <thomas.hommel@gefanuc.com>
5 *
6 * Based on the DS1553 driver from
7 * Atsushi Nemoto <anemo@mba.ocn.ne.jp>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14#include <linux/bcd.h>
15#include <linux/init.h>
16#include <linux/kernel.h>
17#include <linux/delay.h>
18#include <linux/jiffies.h>
19#include <linux/interrupt.h>
20#include <linux/rtc.h>
21#include <linux/platform_device.h>
22#include <linux/io.h>
23
24#define DRV_VERSION "0.1"
25
26#define RTC_REG_SIZE 0x20000
27#define RTC_OFFSET 0x1fff0
28
29#define RTC_FLAGS (RTC_OFFSET + 0)
30#define RTC_CENTURY (RTC_OFFSET + 1)
31#define RTC_SECONDS_ALARM (RTC_OFFSET + 2)
32#define RTC_MINUTES_ALARM (RTC_OFFSET + 3)
33#define RTC_HOURS_ALARM (RTC_OFFSET + 4)
34#define RTC_DATE_ALARM (RTC_OFFSET + 5)
35#define RTC_INTERRUPTS (RTC_OFFSET + 6)
36#define RTC_WATCHDOG (RTC_OFFSET + 7)
37#define RTC_CALIBRATION (RTC_OFFSET + 8)
38#define RTC_SECONDS (RTC_OFFSET + 9)
39#define RTC_MINUTES (RTC_OFFSET + 10)
40#define RTC_HOURS (RTC_OFFSET + 11)
41#define RTC_DAY (RTC_OFFSET + 12)
42#define RTC_DATE (RTC_OFFSET + 13)
43#define RTC_MONTH (RTC_OFFSET + 14)
44#define RTC_YEAR (RTC_OFFSET + 15)
45
46#define RTC_SECONDS_MASK 0x7f
47#define RTC_DAY_MASK 0x07
48#define RTC_CAL_MASK 0x3f
49
50/* Bits in the Calibration register */
51#define RTC_STOP 0x80
52
53/* Bits in the Flags register */
54#define RTC_FLAGS_AF 0x40
55#define RTC_FLAGS_PF 0x20
56#define RTC_WRITE 0x02
57#define RTC_READ 0x01
58
59/* Bits in the Interrupts register */
60#define RTC_INTS_AIE 0x40
61
62struct rtc_plat_data {
63 struct rtc_device *rtc;
64 void __iomem *ioaddr;
65 unsigned long baseaddr;
66 unsigned long last_jiffies;
67 int irq;
68 unsigned int irqen;
69 int alrm_sec;
70 int alrm_min;
71 int alrm_hour;
72 int alrm_mday;
73};
74
75static int stk17ta8_rtc_set_time(struct device *dev, struct rtc_time *tm)
76{
77 struct platform_device *pdev = to_platform_device(dev);
78 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
79 void __iomem *ioaddr = pdata->ioaddr;
80 u8 flags;
81
82 flags = readb(pdata->ioaddr + RTC_FLAGS);
83 writeb(flags | RTC_WRITE, pdata->ioaddr + RTC_FLAGS);
84
85 writeb(BIN2BCD(tm->tm_year % 100), ioaddr + RTC_YEAR);
86 writeb(BIN2BCD(tm->tm_mon + 1), ioaddr + RTC_MONTH);
87 writeb(BIN2BCD(tm->tm_wday) & RTC_DAY_MASK, ioaddr + RTC_DAY);
88 writeb(BIN2BCD(tm->tm_mday), ioaddr + RTC_DATE);
89 writeb(BIN2BCD(tm->tm_hour), ioaddr + RTC_HOURS);
90 writeb(BIN2BCD(tm->tm_min), ioaddr + RTC_MINUTES);
91 writeb(BIN2BCD(tm->tm_sec) & RTC_SECONDS_MASK, ioaddr + RTC_SECONDS);
92 writeb(BIN2BCD((tm->tm_year + 1900) / 100), ioaddr + RTC_CENTURY);
93
94 writeb(flags & ~RTC_WRITE, pdata->ioaddr + RTC_FLAGS);
95 return 0;
96}
97
98static int stk17ta8_rtc_read_time(struct device *dev, struct rtc_time *tm)
99{
100 struct platform_device *pdev = to_platform_device(dev);
101 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
102 void __iomem *ioaddr = pdata->ioaddr;
103 unsigned int year, month, day, hour, minute, second, week;
104 unsigned int century;
105 u8 flags;
106
107 /* give enough time to update RTC in case of continuous read */
108 if (pdata->last_jiffies == jiffies)
109 msleep(1);
110 pdata->last_jiffies = jiffies;
111
112 flags = readb(pdata->ioaddr + RTC_FLAGS);
113 writeb(flags | RTC_READ, ioaddr + RTC_FLAGS);
114 second = readb(ioaddr + RTC_SECONDS) & RTC_SECONDS_MASK;
115 minute = readb(ioaddr + RTC_MINUTES);
116 hour = readb(ioaddr + RTC_HOURS);
117 day = readb(ioaddr + RTC_DATE);
118 week = readb(ioaddr + RTC_DAY) & RTC_DAY_MASK;
119 month = readb(ioaddr + RTC_MONTH);
120 year = readb(ioaddr + RTC_YEAR);
121 century = readb(ioaddr + RTC_CENTURY);
122 writeb(flags & ~RTC_READ, ioaddr + RTC_FLAGS);
123 tm->tm_sec = BCD2BIN(second);
124 tm->tm_min = BCD2BIN(minute);
125 tm->tm_hour = BCD2BIN(hour);
126 tm->tm_mday = BCD2BIN(day);
127 tm->tm_wday = BCD2BIN(week);
128 tm->tm_mon = BCD2BIN(month) - 1;
129 /* year is 1900 + tm->tm_year */
130 tm->tm_year = BCD2BIN(year) + BCD2BIN(century) * 100 - 1900;
131
132 if (rtc_valid_tm(tm) < 0) {
133 dev_err(dev, "retrieved date/time is not valid.\n");
134 rtc_time_to_tm(0, tm);
135 }
136 return 0;
137}
138
139static void stk17ta8_rtc_update_alarm(struct rtc_plat_data *pdata)
140{
141 void __iomem *ioaddr = pdata->ioaddr;
142 unsigned long irqflags;
143 u8 flags;
144
145 spin_lock_irqsave(&pdata->rtc->irq_lock, irqflags);
146
147 flags = readb(ioaddr + RTC_FLAGS);
148 writeb(flags | RTC_WRITE, ioaddr + RTC_FLAGS);
149
150 writeb(pdata->alrm_mday < 0 || (pdata->irqen & RTC_UF) ?
151 0x80 : BIN2BCD(pdata->alrm_mday),
152 ioaddr + RTC_DATE_ALARM);
153 writeb(pdata->alrm_hour < 0 || (pdata->irqen & RTC_UF) ?
154 0x80 : BIN2BCD(pdata->alrm_hour),
155 ioaddr + RTC_HOURS_ALARM);
156 writeb(pdata->alrm_min < 0 || (pdata->irqen & RTC_UF) ?
157 0x80 : BIN2BCD(pdata->alrm_min),
158 ioaddr + RTC_MINUTES_ALARM);
159 writeb(pdata->alrm_sec < 0 || (pdata->irqen & RTC_UF) ?
160 0x80 : BIN2BCD(pdata->alrm_sec),
161 ioaddr + RTC_SECONDS_ALARM);
162 writeb(pdata->irqen ? RTC_INTS_AIE : 0, ioaddr + RTC_INTERRUPTS);
163 readb(ioaddr + RTC_FLAGS); /* clear interrupts */
164 writeb(flags & ~RTC_WRITE, ioaddr + RTC_FLAGS);
165 spin_unlock_irqrestore(&pdata->rtc->irq_lock, irqflags);
166}
167
168static int stk17ta8_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
169{
170 struct platform_device *pdev = to_platform_device(dev);
171 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
172
173 if (pdata->irq < 0)
174 return -EINVAL;
175 pdata->alrm_mday = alrm->time.tm_mday;
176 pdata->alrm_hour = alrm->time.tm_hour;
177 pdata->alrm_min = alrm->time.tm_min;
178 pdata->alrm_sec = alrm->time.tm_sec;
179 if (alrm->enabled)
180 pdata->irqen |= RTC_AF;
181 stk17ta8_rtc_update_alarm(pdata);
182 return 0;
183}
184
185static int stk17ta8_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
186{
187 struct platform_device *pdev = to_platform_device(dev);
188 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
189
190 if (pdata->irq < 0)
191 return -EINVAL;
192 alrm->time.tm_mday = pdata->alrm_mday < 0 ? 0 : pdata->alrm_mday;
193 alrm->time.tm_hour = pdata->alrm_hour < 0 ? 0 : pdata->alrm_hour;
194 alrm->time.tm_min = pdata->alrm_min < 0 ? 0 : pdata->alrm_min;
195 alrm->time.tm_sec = pdata->alrm_sec < 0 ? 0 : pdata->alrm_sec;
196 alrm->enabled = (pdata->irqen & RTC_AF) ? 1 : 0;
197 return 0;
198}
199
200static irqreturn_t stk17ta8_rtc_interrupt(int irq, void *dev_id)
201{
202 struct platform_device *pdev = dev_id;
203 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
204 void __iomem *ioaddr = pdata->ioaddr;
205 unsigned long events = RTC_IRQF;
206
207 /* read and clear interrupt */
208 if (!(readb(ioaddr + RTC_FLAGS) & RTC_FLAGS_AF))
209 return IRQ_NONE;
210 if (readb(ioaddr + RTC_SECONDS_ALARM) & 0x80)
211 events |= RTC_UF;
212 else
213 events |= RTC_AF;
214 rtc_update_irq(pdata->rtc, 1, events);
215 return IRQ_HANDLED;
216}
217
218static void stk17ta8_rtc_release(struct device *dev)
219{
220 struct platform_device *pdev = to_platform_device(dev);
221 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
222
223 if (pdata->irq >= 0) {
224 pdata->irqen = 0;
225 stk17ta8_rtc_update_alarm(pdata);
226 }
227}
228
229static int stk17ta8_rtc_ioctl(struct device *dev, unsigned int cmd,
230 unsigned long arg)
231{
232 struct platform_device *pdev = to_platform_device(dev);
233 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
234
235 if (pdata->irq < 0)
236 return -ENOIOCTLCMD; /* fall back into rtc-dev's emulation */
237 switch (cmd) {
238 case RTC_AIE_OFF:
239 pdata->irqen &= ~RTC_AF;
240 stk17ta8_rtc_update_alarm(pdata);
241 break;
242 case RTC_AIE_ON:
243 pdata->irqen |= RTC_AF;
244 stk17ta8_rtc_update_alarm(pdata);
245 break;
246 default:
247 return -ENOIOCTLCMD;
248 }
249 return 0;
250}
251
252static const struct rtc_class_ops stk17ta8_rtc_ops = {
253 .read_time = stk17ta8_rtc_read_time,
254 .set_time = stk17ta8_rtc_set_time,
255 .read_alarm = stk17ta8_rtc_read_alarm,
256 .set_alarm = stk17ta8_rtc_set_alarm,
257 .release = stk17ta8_rtc_release,
258 .ioctl = stk17ta8_rtc_ioctl,
259};
260
261static ssize_t stk17ta8_nvram_read(struct kobject *kobj, char *buf,
262 loff_t pos, size_t size)
263{
264 struct platform_device *pdev =
265 to_platform_device(container_of(kobj, struct device, kobj));
266 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
267 void __iomem *ioaddr = pdata->ioaddr;
268 ssize_t count;
269
270 for (count = 0; size > 0 && pos < RTC_OFFSET; count++, size--)
271 *buf++ = readb(ioaddr + pos++);
272 return count;
273}
274
275static ssize_t stk17ta8_nvram_write(struct kobject *kobj, char *buf,
276 loff_t pos, size_t size)
277{
278 struct platform_device *pdev =
279 to_platform_device(container_of(kobj, struct device, kobj));
280 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
281 void __iomem *ioaddr = pdata->ioaddr;
282 ssize_t count;
283
284 for (count = 0; size > 0 && pos < RTC_OFFSET; count++, size--)
285 writeb(*buf++, ioaddr + pos++);
286 return count;
287}
288
289static struct bin_attribute stk17ta8_nvram_attr = {
290 .attr = {
291 .name = "nvram",
292 .mode = S_IRUGO | S_IWUGO,
293 .owner = THIS_MODULE,
294 },
295 .size = RTC_OFFSET,
296 .read = stk17ta8_nvram_read,
297 .write = stk17ta8_nvram_write,
298};
299
300static int __init stk17ta8_rtc_probe(struct platform_device *pdev)
301{
302 struct rtc_device *rtc;
303 struct resource *res;
304 unsigned int cal;
305 unsigned int flags;
306 struct rtc_plat_data *pdata;
307 void __iomem *ioaddr = NULL;
308 int ret = 0;
309
310 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
311 if (!res)
312 return -ENODEV;
313
314 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
315 if (!pdata)
316 return -ENOMEM;
317 pdata->irq = -1;
318 if (!request_mem_region(res->start, RTC_REG_SIZE, pdev->name)) {
319 ret = -EBUSY;
320 goto out;
321 }
322 pdata->baseaddr = res->start;
323 ioaddr = ioremap(pdata->baseaddr, RTC_REG_SIZE);
324 if (!ioaddr) {
325 ret = -ENOMEM;
326 goto out;
327 }
328 pdata->ioaddr = ioaddr;
329 pdata->irq = platform_get_irq(pdev, 0);
330
331 /* turn RTC on if it was not on */
332 cal = readb(ioaddr + RTC_CALIBRATION);
333 if (cal & RTC_STOP) {
334 cal &= RTC_CAL_MASK;
335 flags = readb(ioaddr + RTC_FLAGS);
336 writeb(flags | RTC_WRITE, ioaddr + RTC_FLAGS);
337 writeb(cal, ioaddr + RTC_CALIBRATION);
338 writeb(flags & ~RTC_WRITE, ioaddr + RTC_FLAGS);
339 }
340 if (readb(ioaddr + RTC_FLAGS) & RTC_FLAGS_PF)
341 dev_warn(&pdev->dev, "voltage-low detected.\n");
342
343 if (pdata->irq >= 0) {
344 writeb(0, ioaddr + RTC_INTERRUPTS);
345 if (request_irq(pdata->irq, stk17ta8_rtc_interrupt,
346 IRQF_DISABLED | IRQF_SHARED,
347 pdev->name, pdev) < 0) {
348 dev_warn(&pdev->dev, "interrupt not available.\n");
349 pdata->irq = -1;
350 }
351 }
352
353 rtc = rtc_device_register(pdev->name, &pdev->dev,
354 &stk17ta8_rtc_ops, THIS_MODULE);
355 if (IS_ERR(rtc)) {
356 ret = PTR_ERR(rtc);
357 goto out;
358 }
359 pdata->rtc = rtc;
360 pdata->last_jiffies = jiffies;
361 platform_set_drvdata(pdev, pdata);
362 ret = sysfs_create_bin_file(&pdev->dev.kobj, &stk17ta8_nvram_attr);
363 if (ret)
364 goto out;
365 return 0;
366 out:
367 if (pdata->rtc)
368 rtc_device_unregister(pdata->rtc);
369 if (pdata->irq >= 0)
370 free_irq(pdata->irq, pdev);
371 if (ioaddr)
372 iounmap(ioaddr);
373 if (pdata->baseaddr)
374 release_mem_region(pdata->baseaddr, RTC_REG_SIZE);
375 kfree(pdata);
376 return ret;
377}
378
379static int __devexit stk17ta8_rtc_remove(struct platform_device *pdev)
380{
381 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
382
383 sysfs_remove_bin_file(&pdev->dev.kobj, &stk17ta8_nvram_attr);
384 rtc_device_unregister(pdata->rtc);
385 if (pdata->irq >= 0) {
386 writeb(0, pdata->ioaddr + RTC_INTERRUPTS);
387 free_irq(pdata->irq, pdev);
388 }
389 iounmap(pdata->ioaddr);
390 release_mem_region(pdata->baseaddr, RTC_REG_SIZE);
391 kfree(pdata);
392 return 0;
393}
394
395static struct platform_driver stk17ta8_rtc_driver = {
396 .probe = stk17ta8_rtc_probe,
397 .remove = __devexit_p(stk17ta8_rtc_remove),
398 .driver = {
399 .name = "stk17ta8",
400 .owner = THIS_MODULE,
401 },
402};
403
404static __init int stk17ta8_init(void)
405{
406 return platform_driver_register(&stk17ta8_rtc_driver);
407}
408
409static __exit void stk17ta8_exit(void)
410{
411 return platform_driver_unregister(&stk17ta8_rtc_driver);
412}
413
414module_init(stk17ta8_init);
415module_exit(stk17ta8_exit);
416
417MODULE_AUTHOR("Thomas Hommel <thomas.hommel@gefanuc.com>");
418MODULE_DESCRIPTION("Simtek STK17TA8 RTC driver");
419MODULE_LICENSE("GPL");
420MODULE_VERSION(DRV_VERSION);
generated by cgit v1.2.2 (git 2.25.0) at 2025-10-12 01:59:34 -0400