mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-29 06:13:45 +09:00
79f2b3992f
Calculate the early uart clock from the system clock registers set by the bootrom other than the predefine uboot clock macros. Split the early baudrate setting function and the normal baudrate setting one. Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
151 lines
3.4 KiB
C
151 lines
3.4 KiB
C
/*
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* serial.h - common serial defines for early debug and serial driver.
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* any functions defined here must be always_inline since
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* initcode cannot have function calls.
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*
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* Copyright (c) 2004-2011 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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#ifndef __BFIN_CPU_SERIAL4_H__
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#define __BFIN_CPU_SERIAL4_H__
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#include <asm/mach-common/bits/uart4.h>
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#ifndef __ASSEMBLY__
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#include <asm/clock.h>
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#define MMR_UART(n) _PASTE_UART(n, UART, REVID)
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#define UART_BASE MMR_UART(CONFIG_UART_CONSOLE)
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struct bfin_mmr_serial {
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u32 revid;
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u32 control;
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u32 status;
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u32 scr;
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u32 clock;
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u32 emask;
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u32 emaskst;
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u32 emaskcl;
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u32 rbr;
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u32 thr;
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u32 taip;
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u32 tsr;
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u32 rsr;
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u32 txdiv_cnt;
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u32 rxdiv_cnt;
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};
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#define uart_lsr_t uint32_t
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#define _lsr_read(p) bfin_read(&p->status)
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#define _lsr_write(p, v) bfin_write(&p->status, v)
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__attribute__((always_inline))
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static inline void serial_early_do_mach_portmux(char port, int mux_mask,
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int mux_func, int port_pin)
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{
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switch (port) {
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case 'D':
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bfin_write_PORTD_MUX((bfin_read_PORTD_MUX() &
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~mux_mask) | mux_func);
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bfin_write_PORTD_FER_SET(port_pin);
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break;
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case 'G':
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bfin_write_PORTG_MUX((bfin_read_PORTG_MUX() &
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~mux_mask) | mux_func);
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bfin_write_PORTG_FER_SET(port_pin);
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break;
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}
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}
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__attribute__((always_inline))
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static inline void serial_early_do_portmux(void)
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{
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#if defined(__ADSPBF60x__)
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switch (CONFIG_UART_CONSOLE) {
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case 0:
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serial_early_do_mach_portmux('D', PORT_x_MUX_7_MASK,
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PORT_x_MUX_7_FUNC_2, PD7); /* TX: D; mux 7; func 2; PD7 */
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serial_early_do_mach_portmux('D', PORT_x_MUX_8_MASK,
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PORT_x_MUX_8_FUNC_2, PD8); /* RX: D; mux 8; func 2; PD8 */
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break;
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case 1:
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serial_early_do_mach_portmux('G', PORT_x_MUX_15_MASK,
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PORT_x_MUX_15_FUNC_1, PG15); /* TX: G; mux 15; func 1; PG15 */
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serial_early_do_mach_portmux('G', PORT_x_MUX_14_MASK,
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PORT_x_MUX_14_FUNC_1, PG14); /* RX: G; mux 14; func 1; PG14 */
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break;
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}
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#else
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# if (P_UART(RX) & P_DEFINED) || (P_UART(TX) & P_DEFINED)
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# error "missing portmux logic for UART"
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# endif
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#endif
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SSYNC();
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}
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__attribute__((always_inline))
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static inline int uart_init(uint32_t uart_base)
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{
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/* always enable UART to 8-bit mode */
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bfin_write(&pUART->control, UEN | UMOD_UART | WLS_8);
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SSYNC();
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return 0;
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}
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__attribute__((always_inline))
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static inline int serial_early_init(uint32_t uart_base)
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{
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/* handle portmux crap on different Blackfins */
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serial_do_portmux();
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return uart_init(uart_base);
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}
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__attribute__((always_inline))
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static inline int serial_early_uninit(uint32_t uart_base)
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{
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/* disable the UART by clearing UEN */
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bfin_write(&pUART->control, 0);
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return 0;
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}
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__attribute__((always_inline))
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static inline void serial_set_divisor(uint32_t uart_base, uint16_t divisor)
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{
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/* Program the divisor to get the baud rate we want */
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bfin_write(&pUART->clock, divisor);
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SSYNC();
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}
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__attribute__((always_inline))
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static inline void serial_early_set_baud(uint32_t uart_base, uint32_t baud)
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{
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uint16_t divisor = early_division(early_get_uart_clk(), baud * 16);
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/* Program the divisor to get the baud rate we want */
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serial_set_divisor(uart_base, divisor);
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}
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__attribute__((always_inline))
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static inline void serial_early_put_div(uint32_t divisor)
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{
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uint32_t uart_base = UART_BASE;
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bfin_write(&pUART->clock, divisor);
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}
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__attribute__((always_inline))
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static inline uint32_t serial_early_get_div(void)
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{
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uint32_t uart_base = UART_BASE;
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return bfin_read(&pUART->clock);
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}
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#endif
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#endif
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