[U-Boot] [PATCH v2 1/2] rtc: pl031: convert the driver to driver model
AKASHI Takahiro
takahiro.akashi at linaro.org
Thu Jul 5 09:37:40 UTC 2018
On Wed, Jul 04, 2018 at 12:50:52PM +0200, Heinrich Schuchardt wrote:
> On 07/04/2018 09:36 AM, AKASHI Takahiro wrote:
> > Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org>
> > ---
> > drivers/rtc/Kconfig | 6 ++
> > drivers/rtc/pl031.c | 109 +++++++++++++++++----------
> > include/dm/platform_data/rtc_pl031.h | 12 +++
> > 3 files changed, 87 insertions(+), 40 deletions(-)
> > create mode 100644 include/dm/platform_data/rtc_pl031.h
> >
> > diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
> > index a3f8c8aecc..96c4cce410 100644
> > --- a/drivers/rtc/Kconfig
> > +++ b/drivers/rtc/Kconfig
> > @@ -55,6 +55,12 @@ config RTC_MV
> > Enable Marvell RTC driver. This driver supports the rtc that is present
> > on some Marvell SoCs.
> >
> > +config RTC_PL031
> > + bool "Enable ARM PL031 driver"
> > + depends on DM_RTC
> > + help
> > + Enable ARM PL031 driver.
> > +
> > config RTC_S35392A
> > bool "Enable S35392A driver"
> > select BITREVERSE
> > diff --git a/drivers/rtc/pl031.c b/drivers/rtc/pl031.c
> > index 8955805e3b..eecade8374 100644
> > --- a/drivers/rtc/pl031.c
> > +++ b/drivers/rtc/pl031.c
> > @@ -8,14 +8,10 @@
> >
> > #include <common.h>
> > #include <command.h>
> > +#include <dm.h>
> > +#include <dm/platform_data/rtc_pl031.h>
> > #include <rtc.h>
> >
> > -#if defined(CONFIG_CMD_DATE)
> > -
> > -#ifndef CONFIG_SYS_RTC_PL031_BASE
> > -#error CONFIG_SYS_RTC_PL031_BASE is not defined!
> > -#endif
> > -
> > /*
> > * Register definitions
> > */
> > @@ -30,78 +26,111 @@
> >
> > #define RTC_CR_START (1 << 0)
> >
> > -#define RTC_WRITE_REG(addr, val) \
> > - (*(volatile unsigned int *)(CONFIG_SYS_RTC_PL031_BASE + (addr)) = (val))
> > -#define RTC_READ_REG(addr) \
> > - (*(volatile unsigned int *)(CONFIG_SYS_RTC_PL031_BASE + (addr)))
> > +#define RTC_WRITE_REG(base, addr, val) \
> > + (*(volatile unsigned int *)((base) + (addr)) = (val))
> > +#define RTC_READ_REG(base, addr) \
> > + (*(volatile unsigned int *)((base) + (addr)))
> >
> > static int pl031_initted = 0;
> >
> > /* Enable RTC Start in Control register*/
> > -void rtc_init(void)
> > +void pl031_rtc_init(struct pl031_rtc_platdata *pdata)
> > {
> > - RTC_WRITE_REG(RTC_CR, RTC_CR_START);
> > + RTC_WRITE_REG(pdata->base, RTC_CR, RTC_CR_START);
> >
> > pl031_initted = 1;
> > }
> >
> > /*
> > - * Reset the RTC. We set the date back to 1970-01-01.
> > + * Get the current time from the RTC
> > */
> > -void rtc_reset(void)
> > +static int pl031_rtc_get(struct udevice *dev, struct rtc_time *tm)
> > {
> > - RTC_WRITE_REG(RTC_LR, 0x00);
> > - if(!pl031_initted)
> > - rtc_init();
> > + struct pl031_rtc_platdata *pdata = dev_get_platdata(dev);
> > + ulong tim;
> > +
> > + if (!tm) {
> > + puts("Error getting the date/time\n");
> > + return -1;
> > + }
> > +
> > + if (!pl031_initted)
> > + pl031_rtc_init(pdata);
> > +
> > + tim = RTC_READ_REG(pdata->base, RTC_DR);
> > +
> > + rtc_to_tm(tim, tm);
>
> Please, check the return code. The RTC may contain invalid data.
But how do we know if the value is bogus or not?
> > +
> > + debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
> > + tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
> > + tm->tm_hour, tm->tm_min, tm->tm_sec);
> > +
> > + return 0;
> > }
> >
> > /*
> > * Set the RTC
> > -*/
> > -int rtc_set(struct rtc_time *tmp)
> > + */
> > +static int pl031_rtc_set(struct udevice *dev, const struct rtc_time *tm)
> > {
> > + struct pl031_rtc_platdata *pdata = dev_get_platdata(dev);
> > unsigned long tim;
>
> Please, add a debug statement here, too.
OK.
> >
> > - if(!pl031_initted)
> > - rtc_init();
> > -
> > - if (tmp == NULL) {
> > + if (!tm) {
> > puts("Error setting the date/time\n");
> > return -1;
> > }
> >
> > + if (!pl031_initted)
> > + pl031_rtc_init(pdata);
> > +
> > /* Calculate number of seconds this incoming time represents */
> > - tim = rtc_mktime(tmp);
> > + tim = rtc_mktime(tm);
> >
> > - RTC_WRITE_REG(RTC_LR, tim);
> > + RTC_WRITE_REG(pdata->base, RTC_LR, tim);
> >
> > return -1;
>
> No error has occurred. Please, return 0.
Ouch.
> > }
> >
> > /*
> > - * Get the current time from the RTC
> > + * Reset the RTC. We set the date back to 1970-01-01.
> > */
> > -int rtc_get(struct rtc_time *tmp)
> > +static int pl031_rtc_reset(struct udevice *dev)
> > {
> > - ulong tim;
> > + struct pl031_rtc_platdata *pdata = dev_get_platdata(dev);
> >
> > - if(!pl031_initted)
> > - rtc_init();
> > + RTC_WRITE_REG(pdata->base, RTC_LR, 0x00);
> >
> > - if (tmp == NULL) {
> > - puts("Error getting the date/time\n");
> > - return -1;
> > - }
> > + if (!pl031_initted)
>
> nits:
>
> There is no English word initted. I would prefer pl031_initialized.
This variable will go away.
Thanks,
-Takahiro AKASHI
> Best regards
>
> Heinrich
>
> > + pl031_rtc_init(pdata);
> >
> > - tim = RTC_READ_REG(RTC_DR);
> > + return 0;
> > +}
> > +
> > +static const struct rtc_ops pl031_rtc_ops = {
> > + .get = pl031_rtc_get,
> > + .set = pl031_rtc_set,
> > + .reset = pl031_rtc_reset,
> > +};
> >
> > - rtc_to_tm(tim, tmp);
> > +static const struct udevice_id pl031_rtc_ids[] = {
> > + { .compatible = "arm,pl031" },
> > + { }
> > +};
> >
> > - debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
> > - tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
> > - tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
> > +static int pl031_rtc_ofdata_to_platdata(struct udevice *dev)
> > +{
> > + struct pl031_rtc_platdata *pdata = dev_get_platdata(dev);
> >
> > + pdata->base = devfdt_get_addr(dev);
> > return 0;
> > }
> >
> > -#endif
> > +U_BOOT_DRIVER(rtc_pl031) = {
> > + .name = "rtc-pl031",
> > + .id = UCLASS_RTC,
> > + .of_match = pl031_rtc_ids,
> > + .ofdata_to_platdata = pl031_rtc_ofdata_to_platdata,
> > + .platdata_auto_alloc_size = sizeof(struct pl031_rtc_platdata),
> > + .ops = &pl031_rtc_ops,
> > +};
> > diff --git a/include/dm/platform_data/rtc_pl031.h b/include/dm/platform_data/rtc_pl031.h
> > new file mode 100644
> > index 0000000000..8e4ba1ce69
> > --- /dev/null
> > +++ b/include/dm/platform_data/rtc_pl031.h
> > @@ -0,0 +1,12 @@
> > +/* SPDX-License-Identifier: GPL-2.0+ */
> > +
> > +#ifndef __rtc_pl031_h
> > +#define __rtc_pl031_h
> > +
> > +#include <asm/types.h>
> > +
> > +struct pl031_rtc_platdata {
> > + phys_addr_t base;
> > +};
> > +
> > +#endif
> >
>
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