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Animeo IP: add rs485 crossing detection support 

this will be used to force the update or the start test mode

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Jean-Christophe PLAGNIOL-VILLARD 2013-09-19 15:20:26 +02:00 committed by Sascha Hauer
parent 568e628974
commit 7359e28522
2 changed files with 83 additions and 6 deletions
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88
arch/arm/boards/animeo_ip/init.c
View File

@ -239,20 +239,37 @@ static int animeo_ip_devices_init(void)
device_initcall(animeo_ip_devices_init);
static int animeo_ip_console_init(void)
static struct device_d *usart0, *usart1;
static void animeo_ip_shutdown_uart(void *base)
{
#define ATMEL_US_BRGR 0x0020
writel(0, base + ATMEL_US_BRGR);
}
static void animeo_ip_shutdown(void)
{
/*
* disable the dbgu enable by the bootstrap
* disable the dbgu and others enable by the bootstrap
* so linux can detect that we only enable the uart2
* and use it for decompress
*/
#define ATMEL_US_BRGR 0x0020
at91_sys_write(AT91_DBGU + ATMEL_US_BRGR, 0);
animeo_ip_shutdown_uart(IOMEM(AT91_DBGU + AT91_BASE_SYS));
animeo_ip_shutdown_uart(IOMEM(AT91SAM9260_BASE_US0));
animeo_ip_shutdown_uart(IOMEM(AT91SAM9260_BASE_US1));
}
static int animeo_ip_console_init(void)
{
at91_register_uart(3, 0);
usart0 = at91_register_uart(1, ATMEL_UART_RTS);
usart1 = at91_register_uart(2, ATMEL_UART_RTS);
board_shutdown = animeo_ip_shutdown;
barebox_set_model("Somfy Animeo IP");
barebox_set_hostname("animeoip");
at91_register_uart(3, 0);
return 0;
}
console_initcall(animeo_ip_console_init);
@ -263,3 +280,64 @@ static int animeo_ip_main_clock(void)
return 0;
}
pure_initcall(animeo_ip_main_clock);
static unsigned int get_char_timeout(struct console_device *cs, int timeout)
{
uint64_t start = get_time_ns();
do {
if (!cs->tstc(cs))
continue;
return cs->getc(cs);
} while (!is_timeout(start, timeout));
return -1;
}
static int animeo_ip_cross_detect_init(void)
{
struct console_device *cs0, *cs1;
int i;
char *s = "loop";
int crossed = 0;
cs0 = console_get_by_dev(usart0);
if (!cs0)
return -EINVAL;
cs1 = console_get_by_dev(usart1);
if (!cs1)
return -EINVAL;
at91_set_gpio_input(AT91_PIN_PC16, 0);
cs0->set_mode(cs0, CONSOLE_MODE_RS485);
cs0->setbrg(cs0, 38400);
cs1->set_mode(cs1, CONSOLE_MODE_RS485);
cs1->setbrg(cs1, 38400);
/* empty the bus */
while (cs1->tstc(cs1))
cs1->getc(cs1);
for (i = 0; i < strlen(s); i++) {
unsigned int ch = s[i];
unsigned int c;
resend:
cs0->putc(cs0, ch);
c = get_char_timeout(cs1, 10 * MSECOND);
if (c == 0)
goto resend;
else if (c != ch)
goto err;
}
crossed = 1;
err:
export_env_ull("rs485_crossed", crossed);
pr_info("rs485 ports %scrossed\n", crossed ? "" : "not ");
return 0;
}
late_initcall(animeo_ip_cross_detect_init);

1
arch/arm/configs/animeo_ip_defconfig
View File

@ -16,7 +16,6 @@ CONFIG_PROMPT_HUSH_PS2="y"
CONFIG_HUSH_FANCY_PROMPT=y
CONFIG_CMDLINE_EDITING=y
CONFIG_AUTO_COMPLETE=y
CONFIG_CONSOLE_ACTIVATE_ALL=y
CONFIG_DEFAULT_ENVIRONMENT_GENERIC=y
CONFIG_DEFAULT_ENVIRONMENT_PATH="arch/arm/boards/animeo_ip/env"
CONFIG_CMD_EDIT=y