1
2
3
4
5
6
7
8
9
10
11
12
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
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
|
/* SPDX-License-Identifier: GPL-2.0-only */
#include <acpi/acpi_device.h>
#include <acpi/acpigen.h>
#include <device/device.h>
#include <device/i2c.h>
#include <device/i2c_bus.h>
#include <version.h>
#include <console/console.h>
#include <bcd.h>
#include <timer.h>
#include "chip.h"
#include "rx6110sa.h"
/* Function to write a register in the RTC with the given value. */
static void rx6110sa_write(struct device *dev, uint8_t reg, uint8_t val)
{
i2c_dev_writeb_at(dev, reg, val);
}
/* Function to read a register in the RTC. */
static uint8_t rx6110sa_read(struct device *dev, uint8_t reg)
{
return (uint8_t)i2c_dev_readb_at(dev, reg);
}
/* Set RTC date from coreboot build date. */
static void rx6110sa_set_build_date(struct device *dev)
{
rx6110sa_write(dev, YEAR_REG, coreboot_build_date.year);
rx6110sa_write(dev, MONTH_REG, coreboot_build_date.month);
rx6110sa_write(dev, DAY_REG, coreboot_build_date.day);
rx6110sa_write(dev, WEEK_REG, (1 << coreboot_build_date.weekday));
}
/* Set RTC date from user defined date (available in e.g. device tree). */
static void rx6110sa_set_user_date(struct device *dev)
{
struct drivers_i2c_rx6110sa_config *config = dev->chip_info;
rx6110sa_write(dev, YEAR_REG, bin2bcd(config->user_year));
rx6110sa_write(dev, MONTH_REG, bin2bcd(config->user_month));
rx6110sa_write(dev, DAY_REG, bin2bcd(config->user_day));
rx6110sa_write(dev, WEEK_REG, (1 << config->user_weekday));
}
static void rx6110sa_final(struct device *dev)
{
uint8_t hour, minute, second, year, month, day;
/* Read back current RTC date and time and print it to the console. */
hour = rx6110sa_read(dev, HOUR_REG);
minute = rx6110sa_read(dev, MINUTE_REG);
second = rx6110sa_read(dev, SECOND_REG);
year = rx6110sa_read(dev, YEAR_REG);
month = rx6110sa_read(dev, MONTH_REG);
day = rx6110sa_read(dev, DAY_REG);
printk(BIOS_INFO, "%s: Current date %02d.%02d.%02d %02d:%02d:%02d\n",
dev->chip_ops->name, bcd2bin(month), bcd2bin(day),
bcd2bin(year), bcd2bin(hour), bcd2bin(minute), bcd2bin(second));
}
static void rx6110sa_init(struct device *dev)
{
struct drivers_i2c_rx6110sa_config *config = dev->chip_info;
uint8_t reg, flags;
struct stopwatch sw;
/* Do a dummy read first as requested in the datasheet. */
rx6110sa_read(dev, SECOND_REG);
/* Check power loss status by reading the VLF-bit. */
flags = rx6110sa_read(dev, FLAG_REGISTER);
if (flags & VLF_BIT) {
/*
* Voltage low detected, perform RX6110 SA reset sequence as
* requested in the datasheet. The meaning of the registers 0x60
* and above is not documented in the datasheet, they have to be
* used as requested according to Epson.
*/
rx6110sa_write(dev, BATTERY_BACKUP_REG, 0x00);
rx6110sa_write(dev, CTRL_REG, 0x00);
rx6110sa_write(dev, CTRL_REG, TEST_BIT);
rx6110sa_write(dev, 0x60, 0xd3);
rx6110sa_write(dev, 0x66, 0x03);
rx6110sa_write(dev, 0x6b, 0x02);
rx6110sa_write(dev, 0x6b, 0x01);
/* According to the datasheet one have to wait for at least 2 ms
* before the VLF bit can be cleared in the flag register after
* this reset sequence. As the other registers are still
* accessible use the stopwatch to parallel the flow.
*/
stopwatch_init_msecs_expire(&sw, AFTER_RESET_DELAY_MS);
}
/*
* Set up important registers even if there was no power loss to make
* sure that the right mode is used as it directly influences the
* backup current consumption and therefore the backup time. These
* settings do not change current date and time and the RTC will not
* be stopped while the registers are set up.
*/
reg = (config->pmon_sampling & PMON_SAMPL_MASK) |
(!!config->bks_off << 2) | (!!config->bks_on << 3) |
(!!config->iocut_en << 4);
rx6110sa_write(dev, BATTERY_BACKUP_REG, reg);
/* Clear timer enable bit and set frequency of clock output. */
reg = rx6110sa_read(dev, EXTENSION_REG);
reg &= ~(FSEL_MASK);
reg |= ((config->cof_selection << 6) & FSEL_MASK);
if (config->timer_preset) {
/* Timer needs to be in stop mode prior to programming it. */
if (reg & TE_BIT) {
reg &= ~TE_BIT;
rx6110sa_write(dev, EXTENSION_REG, reg);
}
/* Program the timer preset value. */
rx6110sa_write(dev, TMR_COUNTER_0_REG,
config->timer_preset & 0xff);
rx6110sa_write(dev, TMR_COUNTER_1_REG,
(config->timer_preset >> 8) & 0xff);
/* Set Timer Enable bit and the timer clock value. */
reg &= ~TSEL_MASK;
reg |= ((!!config->timer_en << 4) |
(config->timer_clk & TSEL_MASK));
}
rx6110sa_write(dev, EXTENSION_REG, reg);
rx6110sa_write(dev, CTRL_REG, 0x00);
rx6110sa_write(dev, DIGITAL_REG, 0x00);
rx6110sa_write(dev, RESERVED_BIT_REG, RTC_INIT_VALUE);
reg = (!!config->enable_1hz_out << 4) |
(!!config->irq_output_pin << 2) |
(config->fout_output_pin & FOUT_OUTPUT_PIN_MASK);
rx6110sa_write(dev, IRQ_CONTROL_REG, reg);
/* If there was no power loss event no further steps are needed. */
if (!(flags & VLF_BIT))
return;
/* There was a power loss event, clear voltage low detect bit.
* Take the needed delay after a reset sequence into account before the
* VLF-bit can be cleared.
*/
stopwatch_wait_until_expired(&sw);
flags &= ~VLF_BIT;
rx6110sa_write(dev, FLAG_REGISTER, flags);
/* Before setting the clock stop oscillator. */
rx6110sa_write(dev, CTRL_REG, STOP_BIT);
if (config->set_user_date) {
/* Set user date defined in device tree. */
printk(BIOS_DEBUG, "%s: Set to user date\n",
dev->chip_ops->name);
rx6110sa_set_user_date(dev);
} else {
/* Set date from coreboot build. */
printk(BIOS_DEBUG, "%s: Set to coreboot build date\n",
dev->chip_ops->name);
rx6110sa_set_build_date(dev);
}
rx6110sa_write(dev, HOUR_REG, 1);
rx6110sa_write(dev, MINUTE_REG, 0);
rx6110sa_write(dev, SECOND_REG, 0);
/* Start oscillator again as the RTC is set up now. */
reg = (!!config->timer_irq_en << 4) |
(config->timer_mode & TMR_MODE_MASK);
rx6110sa_write(dev, CTRL_REG, reg);
}
#if CONFIG(HAVE_ACPI_TABLES) && !CONFIG(RX6110SA_DISABLE_ACPI)
static void rx6110sa_fill_ssdt(const struct device *dev)
{
struct drivers_i2c_rx6110sa_config *config = dev->chip_info;
const char *scope = acpi_device_scope(dev);
enum i2c_speed bus_speed;
if (!scope)
return;
switch (config->bus_speed) {
case I2C_SPEED_STANDARD:
case I2C_SPEED_FAST:
bus_speed = config->bus_speed;
break;
default:
printk(BIOS_INFO, "%s: Bus speed unsupported, fall back to %d kHz!\n",
dev_path(dev), I2C_SPEED_STANDARD / 1000);
bus_speed = I2C_SPEED_STANDARD;
break;
}
struct acpi_i2c i2c = {
.address = dev->path.i2c.device,
.mode_10bit = dev->path.i2c.mode_10bit,
.speed = bus_speed,
.resource = scope,
};
/* Device */
acpigen_write_scope(scope);
acpigen_write_device(acpi_device_name(dev));
acpigen_write_name_string("_HID", RX6110SA_HID_NAME);
acpigen_write_name_string("_DDN", RX6110SA_HID_DESC);
acpigen_write_STA(acpi_device_status(dev));
/* Resources */
acpigen_write_name("_CRS");
acpigen_write_resourcetemplate_header();
acpi_device_write_i2c(&i2c);
acpigen_write_resourcetemplate_footer();
acpigen_pop_len(); /* Device */
acpigen_pop_len(); /* Scope */
printk(BIOS_INFO, "%s: %s at %s\n", acpi_device_path(dev),
dev->chip_ops->name, dev_path(dev));
}
static const char *rx6110sa_acpi_name(const struct device *dev)
{
return RX6110SA_ACPI_NAME;
}
#endif
static struct device_operations rx6110sa_ops = {
.read_resources = noop_read_resources,
.set_resources = noop_set_resources,
.init = rx6110sa_init,
.final = rx6110sa_final,
#if CONFIG(HAVE_ACPI_TABLES) && !CONFIG(RX6110SA_DISABLE_ACPI)
.acpi_name = rx6110sa_acpi_name,
.acpi_fill_ssdt = rx6110sa_fill_ssdt,
#endif
};
static void rx6110sa_enable(struct device *dev)
{
dev->ops = &rx6110sa_ops;
}
struct chip_operations drivers_i2c_rx6110sa_ops = {
CHIP_NAME("RX6110 SA")
.enable_dev = rx6110sa_enable
};
|
