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Add support for Allwinner A31 RTC controller.

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Very similar to the A10 RTC controller with a few register offsets changed
and a different location for the LOSC switch status.

Submitted by:		Emmanuel Vadot <manu@bidouilliste.com>
Reviewed by:		jmcneill
Approved by:		adrian (mentor)
Differential Revision:	https://reviews.freebsd.org/D5500
This commit is contained in:
jmcneill 2016-03-03 22:19:39 +00:00
parent ea5bbd1d95
commit 0ef6eed68c
1 changed files with 48 additions and 24 deletions
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72
sys/arm/allwinner/aw_rtc.c
View File

@ -48,14 +48,17 @@ __FBSDID("$FreeBSD$");
#include "clock_if.h"
#define LOSC_CTRL_REG 0x00
#define RTC_DATE_REG 0x04
#define RTC_TIME_REG 0x08
#define A10_RTC_DATE_REG 0x04
#define A10_RTC_TIME_REG 0x08
#define A31_LOSC_AUTO_SWT_STA 0x04
#define A31_RTC_DATE_REG 0x10
#define A31_RTC_TIME_REG 0x14
#define TIME_MASK 0x001f3f3f
#define LOSC_OSC_SRC 0x00000001
#define LOSC_GSM 0x00000008
#define LOSC_AUTO_SW_EN 0x00004000
#define LOSC_OSC_SRC (1 << 0)
#define LOSC_GSM (1 << 3)
#define LOSC_AUTO_SW_EN (1 << 14)
#define LOSC_MAGIC 0x16aa0000
#define LOSC_BUSY_MASK 0x00000380
@ -92,15 +95,21 @@ __FBSDID("$FreeBSD$");
#define IS_LEAP_YEAR(y) \
(((y) % 400) == 0 || (((y) % 100) != 0 && ((y) % 4) == 0))
#define A10_RTC 1
#define A20_RTC 2
#define A31_RTC 3
static struct ofw_compat_data compat_data[] = {
{ "allwinner,sun4i-a10-rtc", true },
{ "allwinner,sun7i-a20-rtc", true },
{ NULL, false }
{ "allwinner,sun4i-a10-rtc", A10_RTC },
{ "allwinner,sun7i-a20-rtc", A20_RTC },
{ "allwinner,sun6i-a31-rtc", A31_RTC },
{ NULL, 0 }
};
struct aw_rtc_softc {
struct resource *res;
struct resource *res;
bus_size_t rtc_date;
bus_size_t rtc_time;
};
static int aw_rtc_probe(device_t dev);
@ -151,6 +160,7 @@ static int
aw_rtc_attach(device_t dev)
{
struct aw_rtc_softc *sc = device_get_softc(dev);
bus_size_t rtc_losc_sta;
uint32_t val;
int rid = 0;
@ -160,20 +170,34 @@ aw_rtc_attach(device_t dev)
return (ENXIO);
}
switch (ofw_bus_search_compatible(dev, compat_data)->ocd_data) {
case A10_RTC:
case A20_RTC:
sc->rtc_date = A10_RTC_DATE_REG;
sc->rtc_time = A10_RTC_TIME_REG;
rtc_losc_sta = LOSC_CTRL_REG;
break;
case A31_RTC:
sc->rtc_date = A31_RTC_DATE_REG;
sc->rtc_time = A31_RTC_TIME_REG;
rtc_losc_sta = A31_LOSC_AUTO_SWT_STA;
break;
}
val = RTC_READ(sc, LOSC_CTRL_REG);
val &= ~LOSC_AUTO_SW_EN;
val |= LOSC_AUTO_SW_EN;
val |= LOSC_MAGIC | LOSC_GSM | LOSC_OSC_SRC;
RTC_WRITE(sc, LOSC_CTRL_REG, val);
DELAY(100);
val = RTC_READ(sc, LOSC_CTRL_REG);
if ((val & LOSC_OSC_SRC) == 0) {
bus_release_resource(dev, SYS_RES_MEMORY, rid, sc->res);
device_printf(dev, "set LOSC to external failed\n");
return (ENXIO);
if (bootverbose) {
val = RTC_READ(sc, rtc_losc_sta);
if ((val & LOSC_OSC_SRC) == 0)
device_printf(dev, "Using internal oscillator\n");
else
device_printf(dev, "Using external oscillator\n");
}
clock_register(dev, RTC_RES_US);
return (0);
@ -193,11 +217,11 @@ aw_rtc_gettime(device_t dev, struct timespec *ts)
struct clocktime ct;
uint32_t rdate, rtime;
rdate = RTC_READ(sc, RTC_DATE_REG);
rtime = RTC_READ(sc, RTC_TIME_REG);
rdate = RTC_READ(sc, sc->rtc_date);
rtime = RTC_READ(sc, sc->rtc_time);
if ((rtime & TIME_MASK) == 0)
rdate = RTC_READ(sc, RTC_DATE_REG);
rdate = RTC_READ(sc, sc->rtc_date);
ct.sec = GET_SEC_VALUE(rtime);
ct.min = GET_MIN_VALUE(rtime);
@ -239,7 +263,7 @@ aw_rtc_settime(device_t dev, struct timespec *ts)
DELAY(1);
}
/* reset time register to avoid unexpected date increment */
RTC_WRITE(sc, RTC_TIME_REG, 0);
RTC_WRITE(sc, sc->rtc_time, 0);
rdate = SET_DAY_VALUE(ct.day) | SET_MON_VALUE(ct.mon) |
SET_YEAR_VALUE(ct.year - YEAR_OFFSET) |
@ -255,7 +279,7 @@ aw_rtc_settime(device_t dev, struct timespec *ts)
}
DELAY(1);
}
RTC_WRITE(sc, RTC_DATE_REG, rdate);
RTC_WRITE(sc, sc->rtc_date, rdate);
for (clk = 0; RTC_READ(sc, LOSC_CTRL_REG) & LOSC_BUSY_MASK; clk++) {
if (clk > RTC_TIMEOUT) {
@ -264,7 +288,7 @@ aw_rtc_settime(device_t dev, struct timespec *ts)
}
DELAY(1);
}
RTC_WRITE(sc, RTC_TIME_REG, rtime);
RTC_WRITE(sc, sc->rtc_time, rtime);
DELAY(RTC_TIMEOUT);