LXR uboot/drivers/rtc/rx8025.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * (C) Copyright 2007
   4 * Matthias Fuchs, esd gmbh, matthias.fuchs@esd-electronics.com.
   5 */
   6
   7/*
   8 * Epson RX8025 RTC driver.
   9 */
  10
  11#include <common.h>
  12#include <command.h>
  13#include <dm.h>
  14#include <i2c.h>
  15#include <rtc.h>
  16
  17/*---------------------------------------------------------------------*/
  18#undef DEBUG_RTC
  19
  20#ifdef DEBUG_RTC
  21#define DEBUGR(fmt,args...) printf(fmt ,##args)
  22#else
  23#define DEBUGR(fmt,args...)
  24#endif
  25/*---------------------------------------------------------------------*/
  26
  27#ifndef CONFIG_SYS_I2C_RTC_ADDR
  28# define CONFIG_SYS_I2C_RTC_ADDR        0x32
  29#endif
  30
  31#ifdef CONFIG_DM_RTC
  32#define DEV_TYPE struct udevice
  33#else
  34/* Local udevice */
  35struct ludevice {
  36        u8 chip;
  37};
  38
  39#define DEV_TYPE struct ludevice
  40
  41#endif
  42
  43/*
  44 * RTC register addresses
  45 */
  46#define RTC_SEC_REG_ADDR        0x00
  47#define RTC_MIN_REG_ADDR        0x01
  48#define RTC_HR_REG_ADDR         0x02
  49#define RTC_DAY_REG_ADDR        0x03
  50#define RTC_DATE_REG_ADDR       0x04
  51#define RTC_MON_REG_ADDR        0x05
  52#define RTC_YR_REG_ADDR         0x06
  53
  54#define RTC_CTL1_REG_ADDR       0x0e
  55#define RTC_CTL2_REG_ADDR       0x0f
  56
  57/*
  58 * Control register 1 bits
  59 */
  60#define RTC_CTL1_BIT_2412       0x20
  61
  62/*
  63 * Control register 2 bits
  64 */
  65#define RTC_CTL2_BIT_PON        0x10
  66#define RTC_CTL2_BIT_VDET       0x40
  67#define RTC_CTL2_BIT_XST        0x20
  68#define RTC_CTL2_BIT_VDSL       0x80
  69
  70/*
  71 * Note: the RX8025 I2C RTC requires register
  72 * reads and write to consist of a single bus
  73 * cycle. It is not allowed to write the register
  74 * address in a first cycle that is terminated by
  75 * a STOP condition. The chips needs a 'restart'
  76 * sequence (start sequence without a prior stop).
  77 * This driver has been written for a 4xx board.
  78 * U-Boot's 4xx i2c driver is currently not capable
  79 * to generate such cycles to some work arounds
  80 * are used.
  81 */
  82
  83/* static uchar rtc_read (uchar reg); */
  84#ifdef CONFIG_DM_RTC
  85/*
  86 * on mpc85xx based board with DM and offset len 1
  87 * accessing rtc works fine. May we can drop this ?
  88 */
  89#define rtc_read(reg) buf[(reg) & 0xf]
  90#else
  91#define rtc_read(reg) buf[((reg) + 1) & 0xf]
  92#endif
  93
  94static int rtc_write(DEV_TYPE *dev, uchar reg, uchar val);
  95
  96/*
  97 * Get the current time from the RTC
  98 */
  99static int rx8025_rtc_get(DEV_TYPE *dev, struct rtc_time *tmp)
 100{
 101        int rel = 0;
 102        uchar sec, min, hour, mday, wday, mon, year, ctl2;
 103        uchar buf[16];
 104
 105#ifdef CONFIG_DM_RTC
 106        if (dm_i2c_read(dev, 0, buf, sizeof(buf))) {
 107#else
 108        if (i2c_read(dev->chip, 0, 0, buf, 16)) {
 109#endif
 110                printf("Error reading from RTC\n");
 111                return -EIO;
 112        }
 113
 114        sec = rtc_read(RTC_SEC_REG_ADDR);
 115        min = rtc_read(RTC_MIN_REG_ADDR);
 116        hour = rtc_read(RTC_HR_REG_ADDR);
 117        wday = rtc_read(RTC_DAY_REG_ADDR);
 118        mday = rtc_read(RTC_DATE_REG_ADDR);
 119        mon = rtc_read(RTC_MON_REG_ADDR);
 120        year = rtc_read(RTC_YR_REG_ADDR);
 121
 122        DEBUGR("Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
 123               "hr: %02x min: %02x sec: %02x\n",
 124               year, mon, mday, wday, hour, min, sec);
 125
 126        /* dump status */
 127        ctl2 = rtc_read(RTC_CTL2_REG_ADDR);
 128        if (ctl2 & RTC_CTL2_BIT_PON) {
 129                printf("RTC: power-on detected\n");
 130                rel = -1;
 131        }
 132
 133        if (ctl2 & RTC_CTL2_BIT_VDET) {
 134                printf("RTC: voltage drop detected\n");
 135                rel = -1;
 136        }
 137
 138        if (!(ctl2 & RTC_CTL2_BIT_XST)) {
 139                printf("RTC: oscillator stop detected\n");
 140                rel = -1;
 141        }
 142
 143        tmp->tm_sec  = bcd2bin(sec & 0x7F);
 144        tmp->tm_min  = bcd2bin(min & 0x7F);
 145        if (rtc_read(RTC_CTL1_REG_ADDR) & RTC_CTL1_BIT_2412)
 146                tmp->tm_hour = bcd2bin(hour & 0x3F);
 147        else
 148                tmp->tm_hour = bcd2bin(hour & 0x1F) % 12 +
 149                               ((hour & 0x20) ? 12 : 0);
 150
 151        tmp->tm_mday = bcd2bin (mday & 0x3F);
 152        tmp->tm_mon  = bcd2bin (mon & 0x1F);
 153        tmp->tm_year = bcd2bin (year) + ( bcd2bin (year) >= 70 ? 1900 : 2000);
 154        tmp->tm_wday = bcd2bin (wday & 0x07);
 155        tmp->tm_yday = 0;
 156        tmp->tm_isdst= 0;
 157
 158        DEBUGR("Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
 159               tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
 160               tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
 161
 162        return rel;
 163}
 164
 165/*
 166 * Set the RTC
 167 */
 168static int rx8025_rtc_set(DEV_TYPE *dev, const struct rtc_time *tmp)
 169{
 170        DEBUGR("Set DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
 171               tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
 172               tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
 173
 174        if (tmp->tm_year < 1970 || tmp->tm_year > 2069)
 175                printf("WARNING: year should be between 1970 and 2069!\n");
 176
 177        if (rtc_write(dev, RTC_YR_REG_ADDR, bin2bcd(tmp->tm_year % 100)))
 178                return -EIO;
 179
 180        if (rtc_write(dev, RTC_MON_REG_ADDR, bin2bcd(tmp->tm_mon)))
 181                return -EIO;
 182
 183        if (rtc_write(dev, RTC_DAY_REG_ADDR, bin2bcd(tmp->tm_wday)))
 184                return -EIO;
 185
 186        if (rtc_write(dev, RTC_DATE_REG_ADDR, bin2bcd(tmp->tm_mday)))
 187                return -EIO;
 188
 189        if (rtc_write(dev, RTC_HR_REG_ADDR, bin2bcd(tmp->tm_hour)))
 190                return -EIO;
 191
 192        if (rtc_write(dev, RTC_MIN_REG_ADDR, bin2bcd(tmp->tm_min)))
 193                return -EIO;
 194
 195        if (rtc_write(dev, RTC_SEC_REG_ADDR, bin2bcd(tmp->tm_sec)))
 196                return -EIO;
 197
 198        return rtc_write(dev, RTC_CTL1_REG_ADDR, RTC_CTL1_BIT_2412);
 199}
 200
 201/*
 202 * Reset the RTC
 203 */
 204static int rx8025_rtc_reset(DEV_TYPE *dev)
 205{
 206        uchar buf[16];
 207        uchar ctl2;
 208
 209#ifdef CONFIG_DM_RTC
 210        if (dm_i2c_read(dev, 0, buf, sizeof(buf))) {
 211#else
 212        if (i2c_read(dev->chip, 0, 0, buf, 16)) {
 213#endif
 214                printf("Error reading from RTC\n");
 215                return -EIO;
 216        }
 217
 218        ctl2 = rtc_read(RTC_CTL2_REG_ADDR);
 219        ctl2 &= ~(RTC_CTL2_BIT_PON | RTC_CTL2_BIT_VDET);
 220        ctl2 |= RTC_CTL2_BIT_XST | RTC_CTL2_BIT_VDSL;
 221
 222        return rtc_write(dev, RTC_CTL2_REG_ADDR, ctl2);
 223}
 224
 225/*
 226 * Helper functions
 227 */
 228static int rtc_write(DEV_TYPE *dev, uchar reg, uchar val)
 229{
 230        uchar buf[2];
 231        buf[0] = reg << 4;
 232        buf[1] = val;
 233
 234#ifdef CONFIG_DM_RTC
 235        if (dm_i2c_write(dev, 0, buf, 2)) {
 236#else
 237        if (i2c_write(dev->chip, 0, 0, buf, 2) != 0) {
 238#endif
 239                printf("Error writing to RTC\n");
 240                return -EIO;
 241        }
 242
 243        return 0;
 244}
 245
 246#ifdef CONFIG_DM_RTC
 247static int rx8025_probe(struct udevice *dev)
 248{
 249        uchar buf[16];
 250        int ret = 0;
 251
 252        if (i2c_get_chip_offset_len(dev) != 1)
 253                ret = i2c_set_chip_offset_len(dev, 1);
 254
 255        if (ret)
 256                return ret;
 257
 258        return dm_i2c_read(dev, 0, buf, sizeof(buf));
 259}
 260
 261static const struct rtc_ops rx8025_rtc_ops = {
 262        .get = rx8025_rtc_get,
 263        .set = rx8025_rtc_set,
 264        .reset = rx8025_rtc_reset,
 265};
 266
 267static const struct udevice_id rx8025_rtc_ids[] = {
 268        { .compatible = "epson,rx8025" },
 269        { }
 270};
 271
 272U_BOOT_DRIVER(rx8010sj_rtc) = {
 273        .name     = "rx8025_rtc",
 274        .id           = UCLASS_RTC,
 275        .probe    = rx8025_probe,
 276        .of_match = rx8025_rtc_ids,
 277        .ops      = &rx8025_rtc_ops,
 278};
 279#else
 280int rtc_get(struct rtc_time *tm)
 281{
 282        struct ludevice dev = {
 283                .chip = CONFIG_SYS_I2C_RTC_ADDR,
 284        };
 285
 286        return rx8025_rtc_get(&dev, tm);
 287}
 288
 289int rtc_set(struct rtc_time *tm)
 290{
 291        struct ludevice dev = {
 292                .chip = CONFIG_SYS_I2C_RTC_ADDR,
 293        };
 294
 295        return rx8025_rtc_set(&dev, tm);
 296}
 297
 298void rtc_reset(void)
 299{
 300        struct ludevice dev = {
 301                .chip = CONFIG_SYS_I2C_RTC_ADDR,
 302        };
 303
 304        rx8025_rtc_reset(&dev);
 305}
 306#endif
 307