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/*
* serial.h - common serial defines for early debug and serial driver.
* any functions defined here must be always_inline since
* initcode cannot have function calls.
*
* Copyright (c) 2004-2011 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#ifndef __BFIN_CPU_SERIAL_H__
#define __BFIN_CPU_SERIAL_H__
#include <asm/blackfin.h>
#include <asm/portmux.h>
#ifndef CONFIG_UART_CONSOLE
# define CONFIG_UART_CONSOLE 0
#endif
#ifdef CONFIG_DEBUG_EARLY_SERIAL
# define BFIN_DEBUG_EARLY_SERIAL 1
#else
# define BFIN_DEBUG_EARLY_SERIAL 0
#endif
#if defined(__ADSPBF60x__)
# define BFIN_UART_HW_VER 4
#elif defined(__ADSPBF50x__) || defined(__ADSPBF54x__)
# define BFIN_UART_HW_VER 2
#else
# define BFIN_UART_HW_VER 1
#endif
#define __PASTE_UART(num, pfx, sfx) pfx##num##_##sfx
#define _PASTE_UART(num, pfx, sfx) __PASTE_UART(num, pfx, sfx)
#define _P_UART(n, pin) _PASTE_UART(n, P_UART, pin)
#define P_UART(pin) _P_UART(CONFIG_UART_CONSOLE, pin)
#define pUART ((volatile struct bfin_mmr_serial *)uart_base)
#ifndef __ASSEMBLY__
__attribute__((always_inline))
static inline void serial_do_portmux(void);
#endif
#if BFIN_UART_HW_VER < 4
# include "serial1.h"
#else
# include "serial4.h"
#endif
#ifndef __ASSEMBLY__
__attribute__((always_inline))
static inline void serial_do_portmux(void)
{
if (!BFIN_DEBUG_EARLY_SERIAL) {
const unsigned short pins[] = { P_UART(RX), P_UART(TX), 0, };
peripheral_request_list(pins, "bfin-uart");
return;
}
serial_early_do_portmux();
}
#ifndef BFIN_IN_INITCODE
__attribute__((always_inline))
static inline void serial_early_puts(const char *s)
{
if (BFIN_DEBUG_EARLY_SERIAL) {
serial_puts("Early: ");
serial_puts(s);
}
}
#endif
#else
.macro serial_early_init
#if defined(CONFIG_DEBUG_EARLY_SERIAL) && defined(BFIN_BOOT_BYPASS)
call _serial_initialize;
#endif
.endm
.macro serial_early_set_baud
#if defined(CONFIG_DEBUG_EARLY_SERIAL) && defined(BFIN_BOOT_BYPASS)
R0.L = LO(CONFIG_BAUDRATE);
R0.H = HI(CONFIG_BAUDRATE);
call _serial_set_baud;
#endif
.endm
#if CONFIG_BFIN_BOOT_MODE == BFIN_BOOT_BYPASS
#define update_serial_early_string_addr \
R1.L = _start; \
R1.H = _start; \
R0 = R0 - R1; \
R1.L = 0; \
R1.H = 0x2000; \
R0 = R0 + R1;
#else
#define update_serial_early_string_addr
#endif
/* Since we embed the string right into our .text section, we need
* to find its address. We do this by getting our PC and adding 2
* bytes (which is the length of the jump instruction). Then we
* pass this address to serial_puts().
*/
#ifdef CONFIG_DEBUG_EARLY_SERIAL
# define serial_early_puts(str) \
.section .rodata; \
7: \
.ascii "Early:"; \
.ascii __FILE__; \
.ascii ": "; \
.ascii str; \
.asciz "\n"; \
.previous; \
R0.L = 7b; \
R0.H = 7b; \
update_serial_early_string_addr \
call _serial_puts;
#else
# define serial_early_puts(str)
#endif
#endif
#endif
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