On 07/04/2018 05:46 PM, Alexander Graf wrote:
> On 06/30/2018 04:52 AM, Heinrich Schuchardt wrote:
>> Implement the missing parts of the GetTime() runtime service.
>>
>> Support CONFIG_DM_RTC=n.
>> Fill seconds.
>> Fill daylight saving time flag correctly.
>> Provide dummy values for capabilities.
>>
>> Signed-off-by: Heinrich Schuchardt <xypron.g...@gmx.de>
>> ---
>> lib/efi_loader/efi_runtime.c | 101 +++++++++++++++++++++++++++++------
>> 1 file changed, 86 insertions(+), 15 deletions(-)
>>
>> diff --git a/lib/efi_loader/efi_runtime.c b/lib/efi_loader/efi_runtime.c
>> index 5ec17867fb..20eb3f373d 100644
>> --- a/lib/efi_loader/efi_runtime.c
>> +++ b/lib/efi_loader/efi_runtime.c
>> @@ -10,6 +10,7 @@
>> #include <dm.h>
>> #include <elf.h>
>> #include <efi_loader.h>
>> +#include <i2c.h>
>> #include <rtc.h>
>> /* For manual relocation support */
>> @@ -117,24 +118,86 @@ static void EFIAPI efi_reset_system_boottime(
>> while (1) { }
>> }
>> +int __weak rtc_get(struct rtc_time *tm)
>> +{
>> + return 1;
>> +}
>> +
>> +#if defined(CONFIG_SYS_RTC_BUS_NUM) && !defined(CONFIG_DM_RTC)
>> +/**
>> + * efi_set_rtc_i2c_bus - select I2C bus for real time clock
>> + *
>> + * @bus: bus to select, -1 for default
>> + * Return Value: previously selected bus
>> + */
>> +static int efi_set_rtc_i2c_bus(int bus)
>> +{
>> + int old_bus;
>> +
>> + if (bus < 0)
>> + bus = CONFIG_SYS_RTC_BUS_NUM;
>> +
>> +#ifdef CONFIG_SYS_I2C
>> + old_bus = i2c_get_bus_num();
>> + i2c_set_bus_num(bus);
>> +#else
>> + old_bus = I2C_GET_BUS();
>> + I2C_SET_BUS(bus);
>> +#endif
>> + return old_bus;
>> +}
>> +#endif /* CONFIG_SYS_RTC_BUS_NUM && !CONFIG_DM_RTC */
>> +
>> +/**
>> + * efi_get_time_boottime - get current time
>> + *
>> + * This function implements the GetTime runtime service.
>> + * See the Unified Extensible Firmware Interface (UEFI) specification
>> + * for details.
>> + *
>> + * @time: pointer to structure to receive current time
>> + * @capabilities: pointer to structure to receive RTC properties
>> + * Return Value: status code
>> + */
>> static efi_status_t EFIAPI efi_get_time_boottime(
>> struct efi_time *time,
>> struct efi_time_cap *capabilities)
>> {
>> -#if defined(CONFIG_CMD_DATE) && defined(CONFIG_DM_RTC)
>> - struct rtc_time tm;
>> + efi_status_t ret = EFI_SUCCESS;
>> int r;
>> - struct udevice *dev;
>> + struct rtc_time tm;
>> EFI_ENTRY("%p %p", time, capabilities);
>> - r = uclass_get_device(UCLASS_RTC, 0, &dev);
>> - if (r)
>> - return EFI_EXIT(EFI_DEVICE_ERROR);
>> + if (!time) {
>> + ret = EFI_INVALID_PARAMETER;
>> + goto out;
>> + }
>> - r = dm_rtc_get(dev, &tm);
>> - if (r)
>> - return EFI_EXIT(EFI_DEVICE_ERROR);
>> +#ifdef CONFIG_DM_RTC
>> + {
>> + struct udevice *dev;
>> +
>> + r = uclass_get_device(UCLASS_RTC, 0, &dev);
>> + if (!r)
>> + r = dm_rtc_get(dev, &tm);
>> + }
>> +#else
>> + {
>> +#ifdef CONFIG_SYS_RTC_BUS_NUM
>> + int oldbus = efi_set_rtc_i2c_bus(-1);
>
> Please make up your mind whether you want an #ifdef in this code path or
> not :). So IMHO you should either do the bus setting with ifdefs, but
> then explicitly pass CONFIG_SYS_RTC_BUS_NUM as parameter or do it all
> without ifdefs and just #ifdef out the body of efi_set_rtc_i2c_bus().
The first thing to decide is if we want to support non-DM RTC at all.
What is your oppinion? - I put in the support for non-DM because I did
not see that QEMU was using a device tree. But now Takahiro has set up
the QEMU RTC driver as DM driver.
If CONFIG_SYS_RTC_BUS_NUM is defined or not is independent of
CONFIG_DM_RTC, so we cannot unconditionally pass CONFIG_SYS_RTC_BUS_NUM
here.
Yes I can move the ifdefs to the body efi_set_rtc_i2c_bus() at the
expense of some superfluous code being generated in case the function is
not needed.
But please, answer the above question first.
Best regards
Heinrich
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