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Blackfin: uart: implement loop callback for post 

This allows the Blackfin UART driver to be tested via post.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger 2011-05-14 12:17:46 -04:00
parent 22f45ce48a
commit 90a75b050b
1 changed files with 40 additions and 0 deletions
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40
arch/blackfin/cpu/serial.c
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@ -38,6 +38,7 @@
*/
#include <common.h>
#include <post.h>
#include <watchdog.h>
#include <serial.h>
#include <linux/compiler.h>
@ -153,6 +154,30 @@ static int uart_getc(uint32_t uart_base)
return uart_rbr_val;
}
#if CONFIG_POST & CONFIG_SYS_POST_UART
# define LOOP(x) x
#else
# define LOOP(x)
#endif
LOOP(
static void uart_loop(uint32_t uart_base, int state)
{
u16 mcr;
/* Drain the TX fifo first so bytes don't come back */
while (!(uart_lsr_read(uart_base) & TEMT))
continue;
mcr = bfin_read(&pUART->mcr);
if (state)
mcr |= LOOP_ENA | MRTS;
else
mcr &= ~(LOOP_ENA | MRTS);
bfin_write(&pUART->mcr, mcr);
}
)
#ifdef CONFIG_SYS_BFIN_UART
static void uart_puts(uint32_t uart_base, const char *s)
@ -202,6 +227,13 @@ static void uart##n##_puts(const char *s) \
uart_puts(MMR_UART(n), s); \
} \
\
LOOP( \
static void uart##n##_loop(int state) \
{ \
uart_loop(MMR_UART(n), state); \
} \
) \
\
struct serial_device bfin_serial##n##_device = { \
.name = "bfin_uart"#n, \
.init = uart##n##_init, \
@ -211,6 +243,7 @@ struct serial_device bfin_serial##n##_device = { \
.tstc = uart##n##_tstc, \
.putc = uart##n##_putc, \
.puts = uart##n##_puts, \
LOOP(.loop = uart##n##_loop) \
};
#ifdef UART0_DLL
@ -307,6 +340,13 @@ void serial_puts(const char *s)
serial_putc(*s++);
}
LOOP(
void serial_loop(int state)
{
uart_loop(UART_DLL, state);
}
)
#endif
#endif