diff options
| author | Eugen Hristev | 2018-09-18 10:35:42 +0300 |
|---|---|---|
| committer | Tom Rini | 2018-09-28 20:22:39 -0400 |
| commit | afaea1f56c45f93489cad1a3a3b0c1fbd820fd59 (patch) | |
| tree | c070d134752c8271e72dee8e498f305fd6dcaa27 /board | |
| parent | e42561880cd818e6bd4022a0bcbc73b011faf8a4 (diff) | |
board: atmel: add support for pda detection
This adds the support for PDA detection as common code for
Atmel boards.
Using the one wire interface over GPIO , an EEPROM memory is read
and compared to preprogrammed values for PDA screens TM4300, TM7000
and TM7000B.
Once the PDA is detected, an environment variable is set accordingly.
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Diffstat (limited to 'board')
| -rw-r--r-- | board/atmel/common/board.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/board/atmel/common/board.c b/board/atmel/common/board.c index 650eb2238c7..8f9b5e137c4 100644 --- a/board/atmel/common/board.c +++ b/board/atmel/common/board.c @@ -5,7 +5,64 @@ */ #include <common.h> +#include <w1.h> +#include <w1-eeprom.h> +#include <dm/device-internal.h> + +#define AT91_PDA_EEPROM_ID_OFFSET 15 +#define AT91_PDA_EEPROM_ID_LENGTH 5 +#define AT91_PDA_EEPROM_DEFAULT_BUS 0 void dummy(void) { } + +#if defined CONFIG_W1 +void at91_pda_detect(void) +{ + struct udevice *bus, *dev; + u8 buf[AT91_PDA_EEPROM_ID_LENGTH + 1] = {0}; + int ret; + int pda = 0; + + ret = w1_get_bus(AT91_PDA_EEPROM_DEFAULT_BUS, &bus); + if (ret) + return; + + for (device_find_first_child(bus, &dev); + dev; + device_find_next_child(&dev)) { + ret = device_probe(dev); + if (ret) { + continue; + } else { + ret = w1_eeprom_read_buf(dev, AT91_PDA_EEPROM_ID_OFFSET, + (u8 *)buf, AT91_PDA_EEPROM_ID_LENGTH); + if (ret) + return; + break; + } + } + pda = simple_strtoul((const char *)buf, NULL, 10); + + switch (pda) { + case 7000: + if (buf[4] == 'B') + printf("PDA TM7000B detected\n"); + else + printf("PDA TM7000 detected\n"); + break; + case 4300: + printf("PDA TM4300 detected\n"); + break; + case 5000: + printf("PDA TM5000 detected\n"); + break; + } + env_set("pda", (const char *)buf); +} +#else +void at91_pda_detect(void) +{ +} +#endif |