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bsps/shared: Fix bug in driver for I2C RTCs

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The two RTCs supported by that driver (MCP7940M and EOZ9) use slightly
different register order. Add support for a different order to the
i2c-rtc driver.
This commit is contained in:
Christian Mauderer
2024-11-08 14:40:53 +01:00
committed by Amar Takhar
parent 5ed0bf3457
commit 2c4e3ab117
4 changed files with 60 additions and 51 deletions
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1
bsps/include/libchip/abeoz9-rtc.h
View File

@@ -75,6 +75,7 @@ int abeoz9_rtc_hw_init(struct i2c_rtc_base *base);
i2c_path, \
i2c_address, \
8, \
I2C_RTC_ORDER_sec_min_hour_day_wkday_month_year, \
"abeoz9", \
abeoz9_rtc_hw_init), \
}

41
bsps/include/libchip/i2c-rtc.h
View File

@@ -54,26 +54,26 @@ extern "C" {
*
* Expects a register block with the following time format:
*
* * <base>+0:
* * <base>+off.second:
* * Bit 0 to 6: Seconds (BCD encoded)
* * Bit 7: Don't care
* * <base>+1:
* * <base>+off.minute:
* * Bit 0 to 6: Minutes (BCD encoded)
* * Bit 7: Don't care
* * <base>+2:
* * <base>+off.hour:
* * Bit 0 to 5: Hours (BCD encoded); Bit 5 indicates AM (0) and PM (1) in 12
* hour mode
* * Bit 6: 0 for 24 hour mode; 1 for 12 hour mode
* * <base>+3:
* * Bit 0 to 5: Day (BCD encoded)
* * Bit 6 and 7: Don't care
* * <base>+4:
* * <base>+off.wkday:
* * Bit 0 to 2: Day of Week
* * Bit 3 to 7: Don't care
* * <base>+5:
* * <base>+off.day:
* * Bit 0 to 5: Day (BCD encoded)
* * Bit 6 and 7: Don't care
* * <base>+off.month:
* * Bit 0 to 4: Month (BCD encoded)
* * Bit 5 to 7: Don't care
* * <base>+6:
* * <base>+off.year:
* * Bit 0 to 6: Year (BCD encoded)
* * Bit 7: Don't care
*
@@ -115,8 +115,19 @@ struct i2c_rtc_base {
*/
int (*hw_init) (struct i2c_rtc_base *ctx);
/** Offset of the clock register block. */
/** Offset of the start of the clock register block. */
size_t clock_offset;
/** Order of the fields of the date. */
struct {
size_t year;
size_t month;
size_t wkday;
size_t day;
size_t hour;
size_t min;
size_t sec;
} order;
};
/**
@@ -135,7 +146,14 @@ int i2c_rtc_read(struct i2c_rtc_base *ctx, uint8_t addr, uint8_t *buf,
int i2c_rtc_write(struct i2c_rtc_base *ctx, uint8_t addr, const uint8_t *buf,
size_t len);
#define I2C_RTC_INITIALIZER(i2c_path, i2c_address, offset, driver_name, hwinit)\
#define I2C_RTC_ORDER_sec_min_hour_wkday_day_month_year \
{ .sec = 0, .min = 1, .hour = 2, .day = 4, .wkday = 3, .month = 5, .year = 6 }
#define I2C_RTC_ORDER_sec_min_hour_day_wkday_month_year \
{ .sec = 0, .min = 1, .hour = 2, .day = 3, .wkday = 4, .month = 5, .year = 6 }
#define I2C_RTC_INITIALIZER(i2c_path, i2c_address, offset, reg_order, \
driver_name, hwinit)\
{ \
.mutex = RTEMS_MUTEX_INITIALIZER(driver_name), \
.i2c_bus_path = i2c_path, \
@@ -143,6 +161,7 @@ int i2c_rtc_write(struct i2c_rtc_base *ctx, uint8_t addr, const uint8_t *buf,
.initialized = false, \
.hw_init = hwinit, \
.clock_offset = offset, \
.order = reg_order, \
}
#define I2C_RTC_TBL_ENTRY(dev_name, i2c_rtc_ctx) \

1
bsps/include/libchip/mcp7940m-rtc.h
View File

@@ -78,6 +78,7 @@ int mcp7940m_hw_init(struct i2c_rtc_base *base);
i2c_path, \
i2c_address, \
0, \
I2C_RTC_ORDER_sec_min_hour_wkday_day_month_year, \
"mcp7940", \
mcp7940m_hw_init), \
.crystal = has_crystal, \

68
bsps/shared/dev/rtc/i2c-rtc.c
View File

@@ -43,22 +43,16 @@
#include <sys/stat.h>
#include <unistd.h>
#define REG_RTCSEC 0x00u
#define RTCSEC_SECBCD_SHIFT 0u
#define RTCSEC_SECBCD_MASK (0x7fu << RTCSEC_SECBCD_SHIFT)
#define RTCSEC_SECBCD(x) (((x) << RTCSEC_SECBCD_SHIFT) & RTCSEC_SECBCD_MASK)
#define RTCSEC_SECBCD_GET(x) (((x) & RTCSEC_SECBCD_MASK) >> RTCSEC_SECBCD_SHIFT)
#define REG_RTCMIN 0x01u
#define RTCMIN_MINBCD_SHIFT 0u
#define RTCMIN_MINBCD_MASK (0x7fu << RTCMIN_MINBCD_SHIFT)
#define RTCMIN_MINBCD(x) (((x) << RTCMIN_MINBCD_SHIFT) & RTCMIN_MINBCD_MASK)
#define RTCMIN_MINBCD_GET(x) (((x) & RTCMIN_MINBCD_MASK) >> RTCMIN_MINBCD_SHIFT)
#define REG_RTCHOUR 0x02u
#define RTCHOUR_HRBCD12_SHIFT 0u
#define RTCHOUR_HRBCD12_MASK (0x1fu << RTCHOUR_HRBCD12_SHIFT)
#define RTCHOUR_HRBCD12(x) (((x) << RTCHOUR_HRBCD12_SHIFT) & RTCHOUR_HRBCD12_MASK)
@@ -72,34 +66,28 @@
#define RTCHOUR_AMPM (0x01u << 5)
#define RTCHOUR_1224 (0x01u << 6)
#define REG_RTCWKDAY 0x03u
#define RTCWKDAY_WKDAY_SHIFT 0u
#define RTCWKDAY_WKDAY_MASK (0x7u << RTCWKDAY_WKDAY_SHIFT)
#define RTCWKDAY_WKDAY(x) (((x) << RTCWKDAY_WKDAY_SHIFT) & RTCWKDAY_WKDAY_MASK)
#define RTCWKDAY_WKDAY_GET(x) (((x) & RTCWKDAY_WKDAY_MASK) >> RTCWKDAY_WKDAY_SHIFT)
#define REG_RTCDATE 0x04u
#define RTCDATE_DATEBCD_SHIFT 0u
#define RTCDATE_DATEBCD_MASK (0x3fu << RTCDATE_DATEBCD_SHIFT)
#define RTCDATE_DATEBCD(x) (((x) << RTCDATE_DATEBCD_SHIFT) & RTCDATE_DATEBCD_MASK)
#define RTCDATE_DATEBCD_GET(x) (((x) & RTCDATE_DATEBCD_MASK) >> RTCDATE_DATEBCD_SHIFT)
#define REG_RTCMTH 0x05u
#define RTCMTH_MTHBCD_SHIFT 0u
#define RTCMTH_MTHBCD_MASK (0x1fu << RTCMTH_MTHBCD_SHIFT)
#define RTCMTH_MTHBCD(x) (((x) << RTCMTH_MTHBCD_SHIFT) & RTCMTH_MTHBCD_MASK)
#define RTCMTH_MTHBCD_GET(x) (((x) & RTCMTH_MTHBCD_MASK) >> RTCMTH_MTHBCD_SHIFT)
#define REG_RTCYEAR 0x06u
#define RTCYEAR_YRBCD_SHIFT 0u
#define RTCYEAR_YRBCD_MASK (0xffu << RTCYEAR_YRBCD_SHIFT)
#define RTCYEAR_YRBCD(x) (((x) << RTCYEAR_YRBCD_SHIFT) & RTCYEAR_YRBCD_MASK)
#define RTCYEAR_YRBCD_GET(x) (((x) & RTCYEAR_YRBCD_MASK) >> RTCYEAR_YRBCD_SHIFT)
#define NR_RTC_REGISTERS 0x07u
static inline uint8_t bcd_to_bin(uint8_t bcd)
{
uint8_t bin;
@@ -214,7 +202,7 @@ static int i2c_rtc_initialize_once(struct i2c_rtc_base *ctx)
static int i2c_rtc_get_time(int minor, rtems_time_of_day *time)
{
int rv = 0;
uint8_t buf[REG_RTCYEAR + 1];
uint8_t buf[NR_RTC_REGISTERS];
struct i2c_rtc_base *ctx = i2c_rtc_get_context(minor);
if (!_System_state_Is_up(_System_state_Get())) {
@@ -226,21 +214,21 @@ static int i2c_rtc_get_time(int minor, rtems_time_of_day *time)
rv = i2c_rtc_initialize_once(ctx);
if (rv == 0) {
rv = i2c_rtc_read(ctx, REG_RTCSEC + ctx->clock_offset, buf, sizeof(buf));
rv = i2c_rtc_read(ctx, ctx->clock_offset, buf, sizeof(buf));
}
if (rv == 0) {
unsigned year = bcd_to_bin(RTCYEAR_YRBCD_GET(buf[REG_RTCYEAR])) +
unsigned year = bcd_to_bin(RTCYEAR_YRBCD_GET(buf[ctx->order.year])) +
(TOD_BASE_YEAR / 100 * 100);
if (year < TOD_BASE_YEAR) {
year += 100;
}
time->year = year;
time->month = bcd_to_bin(RTCMTH_MTHBCD_GET(buf[REG_RTCMTH]));
time->day = bcd_to_bin(RTCDATE_DATEBCD_GET(buf[REG_RTCDATE]));
time->hour = bcd_to_bin(RTCHOUR_HRBCD24_GET(buf[REG_RTCHOUR]));
time->minute = bcd_to_bin(RTCMIN_MINBCD_GET(buf[REG_RTCMIN]));
time->second = bcd_to_bin(RTCSEC_SECBCD_GET(buf[REG_RTCSEC]));
time->month = bcd_to_bin(RTCMTH_MTHBCD_GET(buf[ctx->order.month]));
time->day = bcd_to_bin(RTCDATE_DATEBCD_GET(buf[ctx->order.day]));
time->hour = bcd_to_bin(RTCHOUR_HRBCD24_GET(buf[ctx->order.hour]));
time->minute = bcd_to_bin(RTCMIN_MINBCD_GET(buf[ctx->order.min]));
time->second = bcd_to_bin(RTCSEC_SECBCD_GET(buf[ctx->order.sec]));
time->ticks = 0;
}
@@ -252,7 +240,7 @@ static int i2c_rtc_get_time(int minor, rtems_time_of_day *time)
static int i2c_rtc_set_time(int minor, const rtems_time_of_day *time)
{
int rv = 0;
uint8_t buf[REG_RTCYEAR + 1];
uint8_t buf[NR_RTC_REGISTERS];
struct i2c_rtc_base *ctx = i2c_rtc_get_context(minor);
if (!_System_state_Is_up(_System_state_Get())) {
@@ -264,35 +252,35 @@ static int i2c_rtc_set_time(int minor, const rtems_time_of_day *time)
rv = i2c_rtc_initialize_once(ctx);
if (rv == 0) {
rv = i2c_rtc_read(ctx, REG_RTCSEC + ctx->clock_offset, buf, sizeof(buf));
rv = i2c_rtc_read(ctx, ctx->clock_offset, buf, sizeof(buf));
}
if (rv == 0) {
/* Make sure weekday is not 0 (out of range). Otherwise it's not used. */
if (RTCWKDAY_WKDAY_GET(buf[REG_RTCWKDAY]) < 1) {
buf[REG_RTCWKDAY] &= ~RTCWKDAY_WKDAY_MASK;
buf[REG_RTCWKDAY] |= RTCWKDAY_WKDAY(1);
if (RTCWKDAY_WKDAY_GET(buf[ctx->order.wkday]) < 1) {
buf[ctx->order.wkday] &= ~RTCWKDAY_WKDAY_MASK;
buf[ctx->order.wkday] |= RTCWKDAY_WKDAY(1);
}
buf[REG_RTCYEAR] &= ~RTCYEAR_YRBCD_MASK;
buf[REG_RTCYEAR] |= RTCYEAR_YRBCD(bin_to_bcd(time->year % 100));
buf[ctx->order.year] &= ~RTCYEAR_YRBCD_MASK;
buf[ctx->order.year] |= RTCYEAR_YRBCD(bin_to_bcd(time->year % 100));
buf[REG_RTCMTH] &= ~RTCMTH_MTHBCD_MASK;
buf[REG_RTCMTH] |= RTCMTH_MTHBCD(bin_to_bcd(time->month));
buf[ctx->order.month] &= ~RTCMTH_MTHBCD_MASK;
buf[ctx->order.month] |= RTCMTH_MTHBCD(bin_to_bcd(time->month));
buf[REG_RTCDATE] &= ~RTCDATE_DATEBCD_MASK;
buf[REG_RTCDATE] |= RTCDATE_DATEBCD(bin_to_bcd(time->day));
buf[ctx->order.day] &= ~RTCDATE_DATEBCD_MASK;
buf[ctx->order.day] |= RTCDATE_DATEBCD(bin_to_bcd(time->day));
buf[REG_RTCHOUR] &= ~(RTCHOUR_HRBCD24_MASK | RTCHOUR_1224);
buf[REG_RTCHOUR] |= RTCHOUR_HRBCD24(bin_to_bcd(time->hour));
buf[ctx->order.hour] &= ~(RTCHOUR_HRBCD24_MASK | RTCHOUR_1224);
buf[ctx->order.hour] |= RTCHOUR_HRBCD24(bin_to_bcd(time->hour));
buf[REG_RTCMIN] &= ~RTCMIN_MINBCD_MASK;
buf[REG_RTCMIN] |= RTCMIN_MINBCD(bin_to_bcd(time->minute));
buf[ctx->order.min] &= ~RTCMIN_MINBCD_MASK;
buf[ctx->order.min] |= RTCMIN_MINBCD(bin_to_bcd(time->minute));
buf[REG_RTCSEC] &= ~RTCSEC_SECBCD_MASK;
buf[REG_RTCSEC] |= RTCSEC_SECBCD(bin_to_bcd(time->second));
buf[ctx->order.sec] &= ~RTCSEC_SECBCD_MASK;
buf[ctx->order.sec] |= RTCSEC_SECBCD(bin_to_bcd(time->second));
rv = i2c_rtc_write(ctx, REG_RTCSEC + ctx->clock_offset, buf, sizeof(buf));
rv = i2c_rtc_write(ctx, ctx->clock_offset, buf, sizeof(buf));
}
rtems_mutex_unlock(&ctx->mutex);