mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-26 22:52:18 +00:00
f790ef6ff1
Previously, booting over the UART required the baud rate to be known ahead of time. Using a bit of tricky simple math, we can calculate the new board rate based on the old divisors. Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org>
254 lines
7 KiB
C
254 lines
7 KiB
C
/*
|
|
* 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>
|
|
|
|
#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
|
|
|
|
#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)
|
|
{
|
|
#if defined(__ADSPBF51x__)
|
|
# define DO_MUX(port, mux_tx, mux_rx, tx, rx) \
|
|
bfin_write_PORT##port##_MUX((bfin_read_PORT##port##_MUX() & ~(PORT_x_MUX_##mux_tx##_MASK | PORT_x_MUX_##mux_rx##_MASK)) | PORT_x_MUX_##mux_tx##_FUNC_2 | PORT_x_MUX_##mux_rx##_FUNC_2); \
|
|
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, 5, 5, 9, 10); break; /* Port G; mux 5; PG9 and PG10 */
|
|
case 1: DO_MUX(F, 2, 3, 14, 15); break; /* Port H; mux 2/3; PH14 and PH15 */
|
|
}
|
|
SSYNC();
|
|
#elif defined(__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 void serial_early_put_div(uint16_t divisor)
|
|
{
|
|
/* 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();
|
|
}
|
|
|
|
__attribute__((always_inline))
|
|
static inline uint16_t serial_early_get_div(void)
|
|
{
|
|
/* 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;
|
|
|
|
/* Clear DLAB in LCR to Access THR RBR IER */
|
|
ACCESS_PORT_IER();
|
|
SSYNC();
|
|
|
|
return divisor;
|
|
}
|
|
|
|
__attribute__((always_inline))
|
|
static inline void serial_early_set_baud(uint32_t baud)
|
|
{
|
|
/* Translate from baud into divisor in terms of SCLK. The
|
|
* weird multiplication is to make sure we over sample just
|
|
* a little rather than under sample the incoming signals.
|
|
*/
|
|
serial_early_put_div((get_sclk() + (baud * 8)) / (baud * 16) - ANOMALY_05000230);
|
|
}
|
|
|
|
#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
|
|
|
|
/* 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
|