Blame view
drivers/rtc/rtc-ab3100.c
6.42 KB
bd207cfb0 rtc: AB3100 RTC s... |
1 2 3 4 5 6 7 8 9 10 11 |
/* * Copyright (C) 2007-2009 ST-Ericsson AB * License terms: GNU General Public License (GPL) version 2 * RTC clock driver for the AB3100 Analog Baseband Chip * Author: Linus Walleij <linus.walleij@stericsson.com> */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/platform_device.h> #include <linux/rtc.h> |
812f9e9d4 mfd: Renamed ab31... |
12 |
#include <linux/mfd/abx500.h> |
bd207cfb0 rtc: AB3100 RTC s... |
13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 |
/* Clock rate in Hz */ #define AB3100_RTC_CLOCK_RATE 32768 /* * The AB3100 RTC registers. These are the same for * AB3000 and AB3100. * Control register: * Bit 0: RTC Monitor cleared=0, active=1, if you set it * to 1 it remains active until RTC power is lost. * Bit 1: 32 kHz Oscillator, 0 = on, 1 = bypass * Bit 2: Alarm on, 0 = off, 1 = on * Bit 3: 32 kHz buffer disabling, 0 = enabled, 1 = disabled */ #define AB3100_RTC 0x53 /* default setting, buffer disabled, alarm on */ #define RTC_SETTING 0x30 /* Alarm when AL0-AL3 == TI0-TI3 */ #define AB3100_AL0 0x56 #define AB3100_AL1 0x57 #define AB3100_AL2 0x58 #define AB3100_AL3 0x59 /* This 48-bit register that counts up at 32768 Hz */ #define AB3100_TI0 0x5a #define AB3100_TI1 0x5b #define AB3100_TI2 0x5c #define AB3100_TI3 0x5d #define AB3100_TI4 0x5e #define AB3100_TI5 0x5f /* * RTC clock functions and device struct declaration */ |
5c7e11bc6 drivers/rtc/ab310... |
46 |
static int ab3100_rtc_set_mmss(struct device *dev, time64_t secs) |
bd207cfb0 rtc: AB3100 RTC s... |
47 |
{ |
bd207cfb0 rtc: AB3100 RTC s... |
48 49 50 |
u8 regs[] = {AB3100_TI0, AB3100_TI1, AB3100_TI2, AB3100_TI3, AB3100_TI4, AB3100_TI5}; unsigned char buf[6]; |
5c7e11bc6 drivers/rtc/ab310... |
51 |
u64 hw_counter = secs * AB3100_RTC_CLOCK_RATE * 2; |
bd207cfb0 rtc: AB3100 RTC s... |
52 53 |
int err = 0; int i; |
5c7e11bc6 drivers/rtc/ab310... |
54 55 56 57 58 59 |
buf[0] = (hw_counter) & 0xFF; buf[1] = (hw_counter >> 8) & 0xFF; buf[2] = (hw_counter >> 16) & 0xFF; buf[3] = (hw_counter >> 24) & 0xFF; buf[4] = (hw_counter >> 32) & 0xFF; buf[5] = (hw_counter >> 40) & 0xFF; |
bd207cfb0 rtc: AB3100 RTC s... |
60 61 |
for (i = 0; i < 6; i++) { |
fa661258a mfd: AB3100 regis... |
62 |
err = abx500_set_register_interruptible(dev, 0, |
bd207cfb0 rtc: AB3100 RTC s... |
63 64 65 66 67 68 |
regs[i], buf[i]); if (err) return err; } /* Set the flag to mark that the clock is now set */ |
fa661258a mfd: AB3100 regis... |
69 |
return abx500_mask_and_set_register_interruptible(dev, 0, |
bd207cfb0 rtc: AB3100 RTC s... |
70 |
AB3100_RTC, |
fa661258a mfd: AB3100 regis... |
71 |
0x01, 0x01); |
bd207cfb0 rtc: AB3100 RTC s... |
72 73 74 75 76 |
} static int ab3100_rtc_read_time(struct device *dev, struct rtc_time *tm) { |
5c7e11bc6 drivers/rtc/ab310... |
77 |
time64_t time; |
bd207cfb0 rtc: AB3100 RTC s... |
78 79 |
u8 rtcval; int err; |
fa661258a mfd: AB3100 regis... |
80 |
err = abx500_get_register_interruptible(dev, 0, |
bd207cfb0 rtc: AB3100 RTC s... |
81 82 83 84 85 86 87 88 |
AB3100_RTC, &rtcval); if (err) return err; if (!(rtcval & 0x01)) { dev_info(dev, "clock not set (lost power)"); return -EINVAL; } else { |
5c7e11bc6 drivers/rtc/ab310... |
89 |
u64 hw_counter; |
bd207cfb0 rtc: AB3100 RTC s... |
90 91 92 |
u8 buf[6]; /* Read out time registers */ |
fa661258a mfd: AB3100 regis... |
93 |
err = abx500_get_register_page_interruptible(dev, 0, |
bd207cfb0 rtc: AB3100 RTC s... |
94 95 96 97 |
AB3100_TI0, buf, 6); if (err != 0) return err; |
5c7e11bc6 drivers/rtc/ab310... |
98 |
hw_counter = ((u64) buf[5] << 40) | ((u64) buf[4] << 32) | |
bd207cfb0 rtc: AB3100 RTC s... |
99 100 |
((u64) buf[3] << 24) | ((u64) buf[2] << 16) | ((u64) buf[1] << 8) | (u64) buf[0]; |
5c7e11bc6 drivers/rtc/ab310... |
101 |
time = hw_counter / (u64) (AB3100_RTC_CLOCK_RATE * 2); |
bd207cfb0 rtc: AB3100 RTC s... |
102 |
} |
5c7e11bc6 drivers/rtc/ab310... |
103 |
rtc_time64_to_tm(time, tm); |
bd207cfb0 rtc: AB3100 RTC s... |
104 105 106 107 108 109 |
return rtc_valid_tm(tm); } static int ab3100_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) { |
5c7e11bc6 drivers/rtc/ab310... |
110 111 |
time64_t time; u64 hw_counter; |
bd207cfb0 rtc: AB3100 RTC s... |
112 113 114 115 116 |
u8 buf[6]; u8 rtcval; int err; /* Figure out if alarm is enabled or not */ |
fa661258a mfd: AB3100 regis... |
117 |
err = abx500_get_register_interruptible(dev, 0, |
bd207cfb0 rtc: AB3100 RTC s... |
118 119 120 121 122 123 124 125 126 127 |
AB3100_RTC, &rtcval); if (err) return err; if (rtcval & 0x04) alarm->enabled = 1; else alarm->enabled = 0; /* No idea how this could be represented */ alarm->pending = 0; /* Read out alarm registers, only 4 bytes */ |
fa661258a mfd: AB3100 regis... |
128 |
err = abx500_get_register_page_interruptible(dev, 0, |
bd207cfb0 rtc: AB3100 RTC s... |
129 130 131 |
AB3100_AL0, buf, 4); if (err) return err; |
5c7e11bc6 drivers/rtc/ab310... |
132 |
hw_counter = ((u64) buf[3] << 40) | ((u64) buf[2] << 32) | |
bd207cfb0 rtc: AB3100 RTC s... |
133 |
((u64) buf[1] << 24) | ((u64) buf[0] << 16); |
5c7e11bc6 drivers/rtc/ab310... |
134 |
time = hw_counter / (u64) (AB3100_RTC_CLOCK_RATE * 2); |
bd207cfb0 rtc: AB3100 RTC s... |
135 |
|
5c7e11bc6 drivers/rtc/ab310... |
136 |
rtc_time64_to_tm(time, &alarm->time); |
bd207cfb0 rtc: AB3100 RTC s... |
137 138 139 140 141 142 |
return rtc_valid_tm(&alarm->time); } static int ab3100_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) { |
bd207cfb0 rtc: AB3100 RTC s... |
143 144 |
u8 regs[] = {AB3100_AL0, AB3100_AL1, AB3100_AL2, AB3100_AL3}; unsigned char buf[4]; |
5c7e11bc6 drivers/rtc/ab310... |
145 146 |
time64_t secs; u64 hw_counter; |
bd207cfb0 rtc: AB3100 RTC s... |
147 148 |
int err; int i; |
5c7e11bc6 drivers/rtc/ab310... |
149 150 151 152 153 154 |
secs = rtc_tm_to_time64(&alarm->time); hw_counter = secs * AB3100_RTC_CLOCK_RATE * 2; buf[0] = (hw_counter >> 16) & 0xFF; buf[1] = (hw_counter >> 24) & 0xFF; buf[2] = (hw_counter >> 32) & 0xFF; buf[3] = (hw_counter >> 40) & 0xFF; |
bd207cfb0 rtc: AB3100 RTC s... |
155 156 157 |
/* Set the alarm */ for (i = 0; i < 4; i++) { |
fa661258a mfd: AB3100 regis... |
158 |
err = abx500_set_register_interruptible(dev, 0, |
bd207cfb0 rtc: AB3100 RTC s... |
159 160 161 162 163 |
regs[i], buf[i]); if (err) return err; } /* Then enable the alarm */ |
fa661258a mfd: AB3100 regis... |
164 165 |
return abx500_mask_and_set_register_interruptible(dev, 0, AB3100_RTC, (1 << 2), |
bd207cfb0 rtc: AB3100 RTC s... |
166 167 168 169 170 |
alarm->enabled << 2); } static int ab3100_rtc_irq_enable(struct device *dev, unsigned int enabled) { |
bd207cfb0 rtc: AB3100 RTC s... |
171 172 173 174 175 176 177 178 |
/* * It's not possible to enable/disable the alarm IRQ for this RTC. * It does not actually trigger any IRQ: instead its only function is * to power up the system, if it wasn't on. This will manifest as * a "power up cause" in the AB3100 power driver (battery charging etc) * and need to be handled there instead. */ if (enabled) |
fa661258a mfd: AB3100 regis... |
179 180 |
return abx500_mask_and_set_register_interruptible(dev, 0, AB3100_RTC, (1 << 2), |
bd207cfb0 rtc: AB3100 RTC s... |
181 182 |
1 << 2); else |
fa661258a mfd: AB3100 regis... |
183 184 |
return abx500_mask_and_set_register_interruptible(dev, 0, AB3100_RTC, (1 << 2), |
bd207cfb0 rtc: AB3100 RTC s... |
185 186 187 188 189 |
0); } static const struct rtc_class_ops ab3100_rtc_ops = { .read_time = ab3100_rtc_read_time, |
5c7e11bc6 drivers/rtc/ab310... |
190 |
.set_mmss64 = ab3100_rtc_set_mmss, |
bd207cfb0 rtc: AB3100 RTC s... |
191 192 193 194 195 196 197 198 199 200 |
.read_alarm = ab3100_rtc_read_alarm, .set_alarm = ab3100_rtc_set_alarm, .alarm_irq_enable = ab3100_rtc_irq_enable, }; static int __init ab3100_rtc_probe(struct platform_device *pdev) { int err; u8 regval; struct rtc_device *rtc; |
bd207cfb0 rtc: AB3100 RTC s... |
201 202 |
/* The first RTC register needs special treatment */ |
fa661258a mfd: AB3100 regis... |
203 |
err = abx500_get_register_interruptible(&pdev->dev, 0, |
bd207cfb0 rtc: AB3100 RTC s... |
204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 |
AB3100_RTC, ®val); if (err) { dev_err(&pdev->dev, "unable to read RTC register "); return -ENODEV; } if ((regval & 0xFE) != RTC_SETTING) { dev_warn(&pdev->dev, "not default value in RTC reg 0x%x ", regval); } if ((regval & 1) == 0) { /* * Set bit to detect power loss. * This bit remains until RTC power is lost. */ regval = 1 | RTC_SETTING; |
fa661258a mfd: AB3100 regis... |
223 |
err = abx500_set_register_interruptible(&pdev->dev, 0, |
bd207cfb0 rtc: AB3100 RTC s... |
224 225 226 |
AB3100_RTC, regval); /* Ignore any error on this write */ } |
ef886c4d7 rtc: rtc-ab3100: ... |
227 228 |
rtc = devm_rtc_device_register(&pdev->dev, "ab3100-rtc", &ab3100_rtc_ops, THIS_MODULE); |
bd207cfb0 rtc: AB3100 RTC s... |
229 230 231 232 |
if (IS_ERR(rtc)) { err = PTR_ERR(rtc); return err; } |
eba93fcc3 drivers/rtc/rtc-a... |
233 |
platform_set_drvdata(pdev, rtc); |
bd207cfb0 rtc: AB3100 RTC s... |
234 235 236 |
return 0; } |
bd207cfb0 rtc: AB3100 RTC s... |
237 238 239 |
static struct platform_driver ab3100_rtc_driver = { .driver = { .name = "ab3100-rtc", |
bd207cfb0 rtc: AB3100 RTC s... |
240 |
}, |
bd207cfb0 rtc: AB3100 RTC s... |
241 |
}; |
fb34a8120 rtc: rtc-ab3100: ... |
242 |
module_platform_driver_probe(ab3100_rtc_driver, ab3100_rtc_probe); |
bd207cfb0 rtc: AB3100 RTC s... |
243 244 245 246 |
MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>"); MODULE_DESCRIPTION("AB3100 RTC Driver"); MODULE_LICENSE("GPL"); |