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u-boot/drivers/rtc/rv3029.c
Tom Rini d678a59d2d Revert "Merge patch series "arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"" 
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay
Ethernet"' I failed to notice that b4 noticed it was based on next and
so took that as the base commit and merged that part of next to master.

This reverts commit c8ffd1356d, reversing
changes made to 2ee6f3a5f7.

Reported-by: Jonas Karlman <jonas@kwiboo.se>
Signed-off-by: Tom Rini <trini@konsulko.com>
2024-05-19 08:16:36 -06:00

501 lines
12 KiB
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// 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,
};
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