501 lines
12 KiB
C
501 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* (C) Copyright 2018 Theobroma Systems Design und Consulting GmbH
|
|
*
|
|
* Based on a the Linux rtc-rv3029c2.c driver written by:
|
|
* Gregory Hermant <gregory.hermant@calao-systems.com>
|
|
* Michael Buesch <m@bues.ch>
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <command.h>
|
|
#include <dm.h>
|
|
#include <eeprom.h>
|
|
#include <i2c.h>
|
|
#include <log.h>
|
|
#include <rtc.h>
|
|
#include <dm/device_compat.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/delay.h>
|
|
|
|
#define RTC_RV3029_PAGE_LEN 7
|
|
|
|
/* control section */
|
|
#define RV3029_ONOFF_CTRL 0x00
|
|
#define RV3029_ONOFF_CTRL_WE BIT(0)
|
|
#define RV3029_ONOFF_CTRL_TE BIT(1)
|
|
#define RV3029_ONOFF_CTRL_TAR BIT(2)
|
|
#define RV3029_ONOFF_CTRL_EERE BIT(3)
|
|
#define RV3029_ONOFF_CTRL_SRON BIT(4)
|
|
#define RV3029_ONOFF_CTRL_TD0 BIT(5)
|
|
#define RV3029_ONOFF_CTRL_TD1 BIT(6)
|
|
#define RV3029_ONOFF_CTRL_CLKINT BIT(7)
|
|
#define RV3029_IRQ_CTRL 0x01
|
|
#define RV3029_IRQ_CTRL_AIE BIT(0)
|
|
#define RV3029_IRQ_CTRL_TIE BIT(1)
|
|
#define RV3029_IRQ_CTRL_V1IE BIT(2)
|
|
#define RV3029_IRQ_CTRL_V2IE BIT(3)
|
|
#define RV3029_IRQ_CTRL_SRIE BIT(4)
|
|
#define RV3029_IRQ_FLAGS 0x02
|
|
#define RV3029_IRQ_FLAGS_AF BIT(0)
|
|
#define RV3029_IRQ_FLAGS_TF BIT(1)
|
|
#define RV3029_IRQ_FLAGS_V1IF BIT(2)
|
|
#define RV3029_IRQ_FLAGS_V2IF BIT(3)
|
|
#define RV3029_IRQ_FLAGS_SRF BIT(4)
|
|
#define RV3029_STATUS 0x03
|
|
#define RV3029_STATUS_VLOW1 BIT(2)
|
|
#define RV3029_STATUS_VLOW2 BIT(3)
|
|
#define RV3029_STATUS_SR BIT(4)
|
|
#define RV3029_STATUS_PON BIT(5)
|
|
#define RV3029_STATUS_EEBUSY BIT(7)
|
|
#define RV3029_RST_CTRL 0x04
|
|
#define RV3029_RST_CTRL_SYSR BIT(4)
|
|
#define RV3029_CONTROL_SECTION_LEN 0x05
|
|
|
|
/* watch section */
|
|
#define RV3029_W_SEC 0x08
|
|
#define RV3029_W_MINUTES 0x09
|
|
#define RV3029_W_HOURS 0x0A
|
|
#define RV3029_REG_HR_12_24 BIT(6) /* 24h/12h mode */
|
|
#define RV3029_REG_HR_PM BIT(5) /* PM/AM bit in 12h mode */
|
|
#define RV3029_W_DATE 0x0B
|
|
#define RV3029_W_DAYS 0x0C
|
|
#define RV3029_W_MONTHS 0x0D
|
|
#define RV3029_W_YEARS 0x0E
|
|
|
|
/* eeprom control section */
|
|
#define RV3029_CONTROL_E2P_EECTRL 0x30
|
|
#define RV3029_TRICKLE_1K BIT(4) /* 1.5K resistance */
|
|
#define RV3029_TRICKLE_5K BIT(5) /* 5K resistance */
|
|
#define RV3029_TRICKLE_20K BIT(6) /* 20K resistance */
|
|
#define RV3029_TRICKLE_80K BIT(7) /* 80K resistance */
|
|
#define RV3029_TRICKLE_MASK (RV3029_TRICKLE_1K |\
|
|
RV3029_TRICKLE_5K |\
|
|
RV3029_TRICKLE_20K |\
|
|
RV3029_TRICKLE_80K)
|
|
#define RV3029_TRICKLE_SHIFT 4
|
|
|
|
|
|
static int rv3029_rtc_get(struct udevice *dev, struct rtc_time *tm)
|
|
{
|
|
u8 regs[RTC_RV3029_PAGE_LEN];
|
|
int ret;
|
|
|
|
ret = dm_i2c_read(dev, RV3029_W_SEC, regs, sizeof(regs));
|
|
if (ret < 0) {
|
|
printf("%s: error reading RTC: %x\n", __func__, ret);
|
|
return -EIO;
|
|
}
|
|
|
|
tm->tm_sec = bcd2bin(regs[RV3029_W_SEC - RV3029_W_SEC]);
|
|
tm->tm_min = bcd2bin(regs[RV3029_W_MINUTES - RV3029_W_SEC]);
|
|
|
|
/* HR field has a more complex interpretation */
|
|
{
|
|
const u8 _hr = regs[RV3029_W_HOURS - RV3029_W_SEC];
|
|
|
|
if (_hr & RV3029_REG_HR_12_24) {
|
|
/* 12h format */
|
|
tm->tm_hour = bcd2bin(_hr & 0x1f);
|
|
if (_hr & RV3029_REG_HR_PM) /* PM flag set */
|
|
tm->tm_hour += 12;
|
|
} else {
|
|
/* 24h format */
|
|
tm->tm_hour = bcd2bin(_hr & 0x3f);
|
|
}
|
|
}
|
|
|
|
tm->tm_mday = bcd2bin(regs[RV3029_W_DATE - RV3029_W_SEC]);
|
|
tm->tm_mon = bcd2bin(regs[RV3029_W_MONTHS - RV3029_W_SEC]) - 1;
|
|
/* RTC supports only years > 1999 */
|
|
tm->tm_year = bcd2bin(regs[RV3029_W_YEARS - RV3029_W_SEC]) + 2000;
|
|
tm->tm_wday = bcd2bin(regs[RV3029_W_DAYS - RV3029_W_SEC]) - 1;
|
|
|
|
tm->tm_yday = 0;
|
|
tm->tm_isdst = 0;
|
|
|
|
debug("%s: %4d-%02d-%02d (wday=%d) %2d:%02d:%02d\n",
|
|
__func__, tm->tm_year, tm->tm_mon, tm->tm_mday,
|
|
tm->tm_wday, tm->tm_hour, tm->tm_min, tm->tm_sec);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rv3029_rtc_set(struct udevice *dev, const struct rtc_time *tm)
|
|
{
|
|
u8 regs[RTC_RV3029_PAGE_LEN];
|
|
|
|
debug("%s: %4d-%02d-%02d (wday=%d( %2d:%02d:%02d\n",
|
|
__func__, tm->tm_year, tm->tm_mon, tm->tm_mday,
|
|
tm->tm_wday, tm->tm_hour, tm->tm_min, tm->tm_sec);
|
|
|
|
|
|
if (tm->tm_year < 2000) {
|
|
printf("%s: year %d (before 2000) not supported\n",
|
|
__func__, tm->tm_year);
|
|
return -EINVAL;
|
|
}
|
|
|
|
regs[RV3029_W_SEC - RV3029_W_SEC] = bin2bcd(tm->tm_sec);
|
|
regs[RV3029_W_MINUTES - RV3029_W_SEC] = bin2bcd(tm->tm_min);
|
|
regs[RV3029_W_HOURS - RV3029_W_SEC] = bin2bcd(tm->tm_hour);
|
|
regs[RV3029_W_DATE - RV3029_W_SEC] = bin2bcd(tm->tm_mday);
|
|
regs[RV3029_W_MONTHS - RV3029_W_SEC] = bin2bcd(tm->tm_mon + 1);
|
|
regs[RV3029_W_DAYS - RV3029_W_SEC] = bin2bcd(tm->tm_wday + 1) & 0x7;
|
|
regs[RV3029_W_YEARS - RV3029_W_SEC] = bin2bcd(tm->tm_year - 2000);
|
|
|
|
return dm_i2c_write(dev, RV3029_W_SEC, regs, sizeof(regs));
|
|
}
|
|
|
|
static int rv3029_rtc_reset(struct udevice *dev)
|
|
{
|
|
u8 ctrl = RV3029_RST_CTRL_SYSR;
|
|
unsigned long start;
|
|
const unsigned long timeout_ms = 10000;
|
|
int ret;
|
|
|
|
/* trigger the system-reset */
|
|
ret = dm_i2c_write(dev, RV3029_RST_CTRL, &ctrl, 1);
|
|
if (ret < 0)
|
|
return -EIO;
|
|
|
|
/* wait for the system-reset to complete */
|
|
start = get_timer(0);
|
|
do {
|
|
if (get_timer(start) > timeout_ms)
|
|
return -ETIMEDOUT;
|
|
|
|
ret = dm_i2c_read(dev, RV3029_RST_CTRL, &ctrl, 1);
|
|
if (ret < 0)
|
|
return -EIO;
|
|
} while (ctrl & RV3029_RST_CTRL_SYSR);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rv3029_rtc_read8(struct udevice *dev, unsigned int reg)
|
|
{
|
|
u8 data;
|
|
int ret;
|
|
|
|
ret = dm_i2c_read(dev, reg, &data, sizeof(data));
|
|
return ret < 0 ? ret : data;
|
|
}
|
|
|
|
static int rv3029_rtc_write8(struct udevice *dev, unsigned int reg, int val)
|
|
{
|
|
u8 data = val;
|
|
|
|
return dm_i2c_write(dev, reg, &data, 1);
|
|
}
|
|
|
|
#if defined(OF_CONTROL)
|
|
static int rv3029_get_sr(struct udevice *dev, u8 *buf)
|
|
{
|
|
int ret = dm_i2c_read(dev, RV3029_STATUS, buf, 1);
|
|
|
|
if (ret < 0)
|
|
return -EIO;
|
|
|
|
dev_dbg(dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]);
|
|
return 0;
|
|
}
|
|
|
|
static int rv3029_set_sr(struct udevice *dev, u8 val)
|
|
{
|
|
int ret;
|
|
|
|
ret = dm_i2c_read(dev, RV3029_STATUS, &val, 1);
|
|
if (ret < 0)
|
|
return -EIO;
|
|
|
|
dev_dbg(dev, "status = 0x%.2x (%d)\n", val, val);
|
|
return 0;
|
|
}
|
|
|
|
static int rv3029_eeprom_busywait(struct udevice *dev)
|
|
{
|
|
int i, ret;
|
|
u8 sr;
|
|
|
|
for (i = 100; i > 0; i--) {
|
|
ret = rv3029_get_sr(dev, &sr);
|
|
if (ret < 0)
|
|
break;
|
|
if (!(sr & RV3029_STATUS_EEBUSY))
|
|
break;
|
|
udelay(10000);
|
|
}
|
|
if (i <= 0) {
|
|
dev_err(dev, "EEPROM busy wait timeout.\n");
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rv3029_update_bits(struct udevice *dev, u8 reg, u8 mask, u8 set)
|
|
{
|
|
u8 buf;
|
|
int ret;
|
|
|
|
ret = dm_i2c_read(dev, reg, &buf, 1);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if ((buf & mask) == (set && mask))
|
|
return 0;
|
|
|
|
buf = (buf & ~mask) | (set & mask);
|
|
ret = dm_i2c_read(dev, reg, &buf, 1);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rv3029_eeprom_exit(struct udevice *dev)
|
|
{
|
|
/* Re-enable eeprom refresh */
|
|
return rv3029_update_bits(dev, RV3029_ONOFF_CTRL,
|
|
RV3029_ONOFF_CTRL_EERE,
|
|
RV3029_ONOFF_CTRL_EERE);
|
|
}
|
|
|
|
static int rv3029_eeprom_enter(struct udevice *dev)
|
|
{
|
|
int ret;
|
|
u8 sr;
|
|
|
|
/* Check whether we are in the allowed voltage range. */
|
|
ret = rv3029_get_sr(dev, &sr);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (sr & (RV3029_STATUS_VLOW1 | RV3029_STATUS_VLOW2)) {
|
|
/* We clear the bits and retry once just in case
|
|
* we had a brown out in early startup.
|
|
*/
|
|
sr &= ~RV3029_STATUS_VLOW1;
|
|
sr &= ~RV3029_STATUS_VLOW2;
|
|
ret = rv3029_set_sr(dev, sr);
|
|
if (ret < 0)
|
|
return ret;
|
|
udelay(10000);
|
|
ret = rv3029_get_sr(dev, &sr);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (sr & (RV3029_STATUS_VLOW1 | RV3029_STATUS_VLOW2)) {
|
|
dev_err(dev, "Supply voltage is too low to safely access the EEPROM.\n");
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
|
|
/* Disable eeprom refresh. */
|
|
ret = rv3029_update_bits(dev,
|
|
RV3029_ONOFF_CTRL, RV3029_ONOFF_CTRL_EERE, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* Wait for any previous eeprom accesses to finish. */
|
|
ret = rv3029_eeprom_busywait(dev);
|
|
if (ret < 0)
|
|
rv3029_eeprom_exit(dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rv3029_eeprom_read(struct udevice *dev, u8 reg,
|
|
u8 buf[], size_t len)
|
|
{
|
|
int ret, err;
|
|
|
|
err = rv3029_eeprom_enter(dev);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
ret = dm_i2c_read(dev, reg, buf, len);
|
|
|
|
err = rv3029_eeprom_exit(dev);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rv3029_eeprom_write(struct udevice *dev, u8 reg,
|
|
u8 const buf[], size_t len)
|
|
{
|
|
int ret;
|
|
size_t i;
|
|
u8 tmp;
|
|
|
|
ret = rv3029_eeprom_enter(dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
for (i = 0; i < len; i++, reg++) {
|
|
ret = dm_i2c_read(dev, reg, &tmp, 1);
|
|
if (ret < 0)
|
|
break;
|
|
if (tmp != buf[i]) {
|
|
ret = dm_i2c_write(dev, reg, &buf[i], 1);
|
|
if (ret < 0)
|
|
break;
|
|
}
|
|
ret = rv3029_eeprom_busywait(dev);
|
|
if (ret < 0)
|
|
break;
|
|
}
|
|
|
|
ret = rv3029_eeprom_exit(dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rv3029_eeprom_update_bits(struct udevice *dev,
|
|
u8 reg, u8 mask, u8 set)
|
|
{
|
|
u8 buf;
|
|
int ret;
|
|
|
|
ret = rv3029_eeprom_read(dev, reg, &buf, 1);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/*
|
|
* If the EEPROM already reads the correct bitpattern, we don't need
|
|
* to update it.
|
|
*/
|
|
if ((buf & mask) == (set & mask))
|
|
return 0;
|
|
|
|
buf = (buf & ~mask) | (set & mask);
|
|
ret = rv3029_eeprom_write(dev, reg, &buf, 1);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void rv3029_trickle_config(struct udevice *dev)
|
|
{
|
|
static const struct rv3029_trickle_tab_elem {
|
|
u32 r; /* resistance in ohms */
|
|
u8 conf; /* trickle config bits */
|
|
} rv3029_trickle_tab[] = {
|
|
{
|
|
.r = 1076,
|
|
.conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
|
|
RV3029_TRICKLE_20K | RV3029_TRICKLE_80K,
|
|
}, {
|
|
.r = 1091,
|
|
.conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
|
|
RV3029_TRICKLE_20K,
|
|
}, {
|
|
.r = 1137,
|
|
.conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
|
|
RV3029_TRICKLE_80K,
|
|
}, {
|
|
.r = 1154,
|
|
.conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K,
|
|
}, {
|
|
.r = 1371,
|
|
.conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K |
|
|
RV3029_TRICKLE_80K,
|
|
}, {
|
|
.r = 1395,
|
|
.conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K,
|
|
}, {
|
|
.r = 1472,
|
|
.conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_80K,
|
|
}, {
|
|
.r = 1500,
|
|
.conf = RV3029_TRICKLE_1K,
|
|
}, {
|
|
.r = 3810,
|
|
.conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K |
|
|
RV3029_TRICKLE_80K,
|
|
}, {
|
|
.r = 4000,
|
|
.conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K,
|
|
}, {
|
|
.r = 4706,
|
|
.conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_80K,
|
|
}, {
|
|
.r = 5000,
|
|
.conf = RV3029_TRICKLE_5K,
|
|
}, {
|
|
.r = 16000,
|
|
.conf = RV3029_TRICKLE_20K | RV3029_TRICKLE_80K,
|
|
}, {
|
|
.r = 20000,
|
|
.conf = RV3029_TRICKLE_20K,
|
|
}, {
|
|
.r = 80000,
|
|
.conf = RV3029_TRICKLE_80K,
|
|
},
|
|
};
|
|
int err;
|
|
u32 ohms;
|
|
u8 trickle_set_bits = 0;
|
|
|
|
/* Configure the trickle charger. */
|
|
err = dev_read_u32(dev, "trickle-resistor-ohms", &ohms);
|
|
|
|
if (!err) {
|
|
/* Find trickle-charger config */
|
|
for (int i = 0; i < ARRAY_SIZE(rv3029_trickle_tab); i++)
|
|
if (rv3029_trickle_tab[i].r >= ohms) {
|
|
dev_dbg(dev, "trickle charger at %d ohms\n",
|
|
rv3029_trickle_tab[i].r);
|
|
trickle_set_bits = rv3029_trickle_tab[i].conf;
|
|
break;
|
|
}
|
|
}
|
|
|
|
dev_dbg(dev, "trickle charger config 0x%x\n", trickle_set_bits);
|
|
err = rv3029_eeprom_update_bits(dev, RV3029_CONTROL_E2P_EECTRL,
|
|
RV3029_TRICKLE_MASK,
|
|
trickle_set_bits);
|
|
if (err < 0)
|
|
dev_dbg(dev, "failed to update trickle charger\n");
|
|
}
|
|
#else
|
|
static inline void rv3029_trickle_config(struct udevice *dev)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static int rv3029_probe(struct udevice *dev)
|
|
{
|
|
i2c_set_chip_flags(dev, DM_I2C_CHIP_RD_ADDRESS |
|
|
DM_I2C_CHIP_WR_ADDRESS);
|
|
|
|
rv3029_trickle_config(dev);
|
|
return 0;
|
|
}
|
|
|
|
static const struct rtc_ops rv3029_rtc_ops = {
|
|
.get = rv3029_rtc_get,
|
|
.set = rv3029_rtc_set,
|
|
.read8 = rv3029_rtc_read8,
|
|
.write8 = rv3029_rtc_write8,
|
|
.reset = rv3029_rtc_reset,
|
|
};
|
|
|
|
static const struct udevice_id rv3029_rtc_ids[] = {
|
|
{ .compatible = "mc,rv3029" },
|
|
{ .compatible = "mc,rv3029c2" },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(rtc_rv3029) = {
|
|
.name = "rtc-rv3029",
|
|
.id = UCLASS_RTC,
|
|
.probe = rv3029_probe,
|
|
.of_match = rv3029_rtc_ids,
|
|
.ops = &rv3029_rtc_ops,
|
|
};
|