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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) 2004-2007 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/mach-common/bits/uart.h>
#ifdef CONFIG_DEBUG_EARLY_SERIAL
# define BFIN_DEBUG_EARLY_SERIAL 1
#else
# define BFIN_DEBUG_EARLY_SERIAL 0
#endif
#define LOB(x) ((x) & 0xFF)
#define HIB(x) (((x) >> 8) & 0xFF)
#ifndef UART_LSR
# if (CONFIG_UART_CONSOLE == 3)
# define pUART_DLH pUART3_DLH
# define pUART_DLL pUART3_DLL
# define pUART_GCTL pUART3_GCTL
# define pUART_IER pUART3_IER
# define pUART_IERC pUART3_IER_CLEAR
# define pUART_LCR pUART3_LCR
# define pUART_LSR pUART3_LSR
# define pUART_RBR pUART3_RBR
# define pUART_THR pUART3_THR
# define UART_THR UART3_THR
# define UART_LSR UART3_LSR
# elif (CONFIG_UART_CONSOLE == 2)
# define pUART_DLH pUART2_DLH
# define pUART_DLL pUART2_DLL
# define pUART_GCTL pUART2_GCTL
# define pUART_IER pUART2_IER
# define pUART_IERC pUART2_IER_CLEAR
# define pUART_LCR pUART2_LCR
# define pUART_LSR pUART2_LSR
# define pUART_RBR pUART2_RBR
# define pUART_THR pUART2_THR
# define UART_THR UART2_THR
# define UART_LSR UART2_LSR
# elif (CONFIG_UART_CONSOLE == 1)
# define pUART_DLH pUART1_DLH
# define pUART_DLL pUART1_DLL
# define pUART_GCTL pUART1_GCTL
# define pUART_IER pUART1_IER
# define pUART_IERC pUART1_IER_CLEAR
# define pUART_LCR pUART1_LCR
# define pUART_LSR pUART1_LSR
# define pUART_RBR pUART1_RBR
# define pUART_THR pUART1_THR
# define UART_THR UART1_THR
# define UART_LSR UART1_LSR
# elif (CONFIG_UART_CONSOLE == 0)
# define pUART_DLH pUART0_DLH
# define pUART_DLL pUART0_DLL
# define pUART_GCTL pUART0_GCTL
# define pUART_IER pUART0_IER
# define pUART_IERC pUART0_IER_CLEAR
# define pUART_LCR pUART0_LCR
# define pUART_LSR pUART0_LSR
# define pUART_RBR pUART0_RBR
# define pUART_THR pUART0_THR
# define UART_THR UART0_THR
# define UART_LSR UART0_LSR
# endif
#endif
#ifndef __ASSEMBLY__
/* We cannot use get_sclk() in initcode as it is defined elsewhere. */
#ifdef BFIN_IN_INITCODE
# define get_sclk() (CONFIG_CLKIN_HZ * CONFIG_VCO_MULT / CONFIG_SCLK_DIV)
#endif
#ifdef __ADSPBF54x__
# define ACCESS_LATCH()
# define ACCESS_PORT_IER()
# define CLEAR_IER() (*pUART_IERC = 0)
#else
# define ACCESS_LATCH() (*pUART_LCR |= DLAB)
# define ACCESS_PORT_IER() (*pUART_LCR &= ~DLAB)
# define CLEAR_IER() (*pUART_IER = 0)
#endif
__attribute__((always_inline))
static inline void serial_do_portmux(void)
{
#ifdef __ADSPBF52x__
# define DO_MUX(port, mux, tx, rx) \
bfin_write_PORT##port##_MUX((bfin_read_PORT##port##_MUX() & ~PORT_x_MUX_##mux##_MASK) | PORT_x_MUX_##mux##_FUNC_3); \
bfin_write_PORT##port##_FER(bfin_read_PORT##port##_FER() | P##port##tx | P##port##rx);
switch (CONFIG_UART_CONSOLE) {
case 0: DO_MUX(G, 2, 7, 8); break; /* Port G; mux 2; PG2 and PG8 */
case 1: DO_MUX(F, 5, 14, 15); break; /* Port F; mux 5; PF14 and PF15 */
}
SSYNC();
#elif defined(__ADSPBF537__) || defined(__ADSPBF536__) || defined(__ADSPBF534__)
# define DO_MUX(func, tx, rx) \
bfin_write_PORT_MUX(bfin_read_PORT_MUX() & ~(func)); \
bfin_write_PORTF_FER(bfin_read_PORTF_FER() | PF##tx | PF##rx);
switch (CONFIG_UART_CONSOLE) {
case 0: DO_MUX(PFDE, 0, 1); break;
case 1: DO_MUX(PFTE, 2, 3); break;
}
SSYNC();
#elif defined(__ADSPBF54x__)
# define DO_MUX(port, tx, rx) \
bfin_write_PORT##port##_MUX((bfin_read_PORT##port##_MUX() & ~(PORT_x_MUX_##tx##_MASK | PORT_x_MUX_##rx##_MASK)) | PORT_x_MUX_##tx##_FUNC_1 | PORT_x_MUX_##rx##_FUNC_1); \
bfin_write_PORT##port##_FER(bfin_read_PORT##port##_FER() | P##port##tx | P##port##rx);
switch (CONFIG_UART_CONSOLE) {
case 0: DO_MUX(E, 7, 8); break; /* Port E; PE7 and PE8 */
case 1: DO_MUX(H, 0, 1); break; /* Port H; PH0 and PH1 */
case 2: DO_MUX(B, 4, 5); break; /* Port B; PB4 and PB5 */
case 3: DO_MUX(B, 6, 7); break; /* Port B; PB6 and PB7 */
}
SSYNC();
#endif
}
__attribute__((always_inline))
static inline void serial_early_init(void)
{
/* handle portmux crap on different Blackfins */
serial_do_portmux();
/* Enable UART */
*pUART_GCTL = UCEN;
/* Set LCR to Word Lengh 8-bit word select */
*pUART_LCR = WLS_8;
SSYNC();
}
__attribute__((always_inline))
static inline uint32_t serial_early_get_baud(void)
{
/* If the UART isnt enabled, then we are booting an LDR
* from a non-UART source (so like flash) which means
* the baud rate here is meaningless.
*/
if ((*pUART_GCTL & UCEN) != UCEN)
return 0;
#if (0) /* See comment for serial_reset_baud() in initcode.c */
/* Set DLAB in LCR to Access DLL and DLH */
ACCESS_LATCH();
SSYNC();
uint8_t dll = *pUART_DLL;
uint8_t dlh = *pUART_DLH;
uint16_t divisor = (dlh << 8) | dll;
uint32_t baud = get_sclk() / (divisor * 16);
/* Clear DLAB in LCR to Access THR RBR IER */
ACCESS_PORT_IER();
SSYNC();
return baud;
#else
return CONFIG_BAUDRATE;
#endif
}
__attribute__((always_inline))
static inline void serial_early_set_baud(uint32_t baud)
{
/* Translate from baud into divisor in terms of SCLK.
* The +1 is to make sure we over sample just a little
* rather than under sample the incoming signals.
*/
uint16_t divisor = (get_sclk() / (baud * 16)) + 1;
/* Set DLAB in LCR to Access DLL and DLH */
ACCESS_LATCH();
SSYNC();
/* Program the divisor to get the baud rate we want */
*pUART_DLL = LOB(divisor);
*pUART_DLH = HIB(divisor);
SSYNC();
/* Clear DLAB in LCR to Access THR RBR IER */
ACCESS_PORT_IER();
SSYNC();
}
#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
#ifdef CONFIG_DEBUG_EARLY_SERIAL
call _serial_initialize;
#endif
.endm
.macro serial_early_set_baud
#ifdef CONFIG_DEBUG_EARLY_SERIAL
R0.L = LO(CONFIG_BAUDRATE);
R0.H = HI(CONFIG_BAUDRATE);
call _serial_set_baud;
#endif
.endm
/* Recursively expand calls to _serial_putc for every byte
* passed to us. Append a newline when we're all done.
*/
.macro _serial_early_putc byte:req morebytes:vararg
#ifdef CONFIG_DEBUG_EARLY_SERIAL
R0 = \byte;
call _serial_putc;
.ifnb \morebytes
_serial_early_putc \morebytes
.else
.if (\byte != '\n')
_serial_early_putc '\n'
.endif
.endif
#endif
.endm
/* Wrapper around recurisve _serial_early_putc macro which
* simply prepends the string "Early: "
*/
.macro serial_early_putc byte:req morebytes:vararg
#ifdef CONFIG_DEBUG_EARLY_SERIAL
_serial_early_putc 'E', 'a', 'r', 'l', 'y', ':', ' ', \byte, \morebytes
#endif
.endm
/* 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) \
call _get_pc; \
jump 1f; \
.ascii "Early:"; \
.ascii __FILE__; \
.ascii ": "; \
.ascii str; \
.asciz "\n"; \
.align 4; \
1: \
R0 += 2; \
call _serial_puts;
#else
# define serial_early_puts(str)
#endif
#endif
#endif
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