Tomas Hlavacek
13 years ago
committed by
Wolfgang Denk
parent
cbcc33e951
commit
0d9e59948a
@ -0,0 +1,258 @@ |
||||
============================= |
||||
RTC device subsystem analysis |
||||
============================= |
||||
|
||||
Tomas Hlavacek <tmshlvck@gmail.com> |
||||
2012-03-10 |
||||
|
||||
I) Overview |
||||
----------- |
||||
|
||||
U-Boot currently implements one common API for RTC devices. The interface |
||||
is defined in include/rtc.h and comprises of functions and structures: |
||||
|
||||
struct rtc_time { |
||||
int tm_sec; |
||||
int tm_min; |
||||
int tm_hour; |
||||
int tm_mday; |
||||
int tm_mon; |
||||
int tm_year; |
||||
int tm_wday; |
||||
int tm_yday; |
||||
int tm_isdst; |
||||
}; |
||||
|
||||
int rtc_get (struct rtc_time *); |
||||
int rtc_set (struct rtc_time *); |
||||
void rtc_reset (void); |
||||
|
||||
The functions are implemented by a proper device driver in drivers/rtc |
||||
directory and the driver to be compiled in is selected in a Makefile. |
||||
Drivers are mutually exclusive. |
||||
|
||||
Drivers depends on date code in drivers/rtc/date.c and naturally on board |
||||
specific data. |
||||
|
||||
II) Approach |
||||
------------ |
||||
|
||||
1) New API |
||||
---------- |
||||
In the UDM each rtc driver would register itself by a function |
||||
|
||||
int rtc_device_register(struct instance *i, |
||||
struct rtc_device_ops *o); |
||||
|
||||
The structure being defined as follows: |
||||
|
||||
struct rtc_device_ops { |
||||
int (*get_time)(struct instance *i, struct rtc_time *t); |
||||
int (*set_time)(struct instance *i, struct rtc_time *t); |
||||
int (*reset)(struct instance *i); |
||||
}; |
||||
|
||||
|
||||
2) Conversion thougths |
||||
---------------------- |
||||
U-Boot RTC drivers exports the same functions and therefore the conversion |
||||
of the drivers is straight-forward. There is no initialization needed. |
||||
|
||||
|
||||
III) Analysis of in-tree drivers |
||||
-------------------------------- |
||||
|
||||
1) drivers/rtc/rv3029.c |
||||
----------------------- |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
2) drivers/rtc/s3c24x0_rtc.c |
||||
---------------------------- |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
3) drivers/rtc/pt7c4338.c |
||||
------------------------- |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
4) drivers/rtc/mvrtc.c |
||||
---------------------- |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
5) drivers/rtc/ftrtc010.c |
||||
------------------------- |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
6) drivers/rtc/mpc5xxx.c |
||||
------------------------ |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
7) drivers/rtc/ds164x.c |
||||
----------------------- |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
8) drivers/rtc/rs5c372.c |
||||
------------------------ |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
9) drivers/rtc/m41t94.c |
||||
----------------------- |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
10) drivers/rtc/mc13xxx-rtc.c |
||||
----------------------------- |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
11) drivers/rtc/mcfrtc.c |
||||
------------------------ |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
12) drivers/rtc/davinci.c |
||||
------------------------- |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
13) drivers/rtc/rx8025.c |
||||
------------------------ |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
14) drivers/rtc/bfin_rtc.c |
||||
-------------------------- |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
15) drivers/rtc/m41t62.c |
||||
------------------------ |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
16) drivers/rtc/ds1306.c |
||||
------------------------ |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
17) drivers/rtc/mpc8xx.c |
||||
------------------------ |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
18) drivers/rtc/ds3231.c |
||||
------------------------ |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
19) drivers/rtc/ds12887.c |
||||
------------------------- |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
20) drivers/rtc/ds1302.c |
||||
------------------------ |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
21) drivers/rtc/ds1374.c |
||||
------------------------ |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
22) drivers/rtc/ds174x.c |
||||
------------------------ |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
23) drivers/rtc/m41t60.c |
||||
------------------------ |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
24) drivers/rtc/m48t35ax.c |
||||
-------------------------- |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
25) drivers/rtc/pl031.c |
||||
----------------------- |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
26) drivers/rtc/x1205.c |
||||
----------------------- |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
27) drivers/rtc/m41t11.c |
||||
------------------------ |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
28) drivers/rtc/pcf8563.c |
||||
------------------------- |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
29) drivers/rtc/mk48t59.c |
||||
------------------------- |
||||
Macros needs cleanup. Besides that the driver is standard rtc. |
||||
Simple conversion is possible. |
||||
|
||||
|
||||
30) drivers/rtc/mxsrtc.c |
||||
------------------------ |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
31) drivers/rtc/ds1307.c |
||||
------------------------ |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
32) drivers/rtc/ds1556.c |
||||
------------------------ |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
33) drivers/rtc/rtc4543.c |
||||
------------------------- |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
34) drivers/rtc/s3c44b0_rtc.c |
||||
----------------------------- |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
35) drivers/rtc/ds1337.c |
||||
------------------------ |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
36) drivers/rtc/isl1208.c |
||||
------------------------- |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
37) drivers/rtc/max6900.c |
||||
------------------------- |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
38) drivers/rtc/mc146818.c |
||||
-------------------------- |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
|
||||
|
||||
39) drivers/rtc/at91sam9_rtt.c |
||||
------------------------------ |
||||
The driver is standard rtc. Simple conversion is possible. |
||||
Loading…
Reference in new issue