9948c521a6
Instead of having callbacks into serial console code to set up the coreboot table have the coreboot table code call IP specific code to get serial information. This makes it easier to reuse the information as the return value can be used in a different context (e.g. when filling in a FDT). This also removes boilerplate code to set up lb_console entries by setting entry based on the type in struct lb_uart. Change-Id: I6c08a88fb5fc035eb28d0becf19471c709c8043d Signed-off-by: Arthur Heymans <arthur@aheymans.xyz> Reviewed-on: https://review.coreboot.org/c/coreboot/+/68768 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Hung-Te Lin <hungte@chromium.org>
121 lines
3.1 KiB
C
121 lines
3.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#include <arch/io.h>
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#include <boot/coreboot_tables.h>
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#include <commonlib/bsd/helpers.h>
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#include <console/uart.h>
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#include <stdint.h>
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#include "uart8250reg.h"
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/* Should support 8250, 16450, 16550, 16550A type UARTs */
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/* Expected character delay at 1200bps is 9ms for a working UART
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* and no flow-control. Assume UART as stuck if shift register
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* or FIFO takes more than 50ms per character to appear empty.
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*
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* Estimated that inb() from UART takes 1 microsecond.
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*/
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#define SINGLE_CHAR_TIMEOUT (50 * 1000)
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#define FIFO_TIMEOUT (16 * SINGLE_CHAR_TIMEOUT)
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static int uart8250_can_tx_byte(unsigned int base_port)
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{
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return inb(base_port + UART8250_LSR) & UART8250_LSR_THRE;
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}
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static void uart8250_tx_byte(unsigned int base_port, unsigned char data)
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{
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unsigned long int i = SINGLE_CHAR_TIMEOUT;
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while (i-- && !uart8250_can_tx_byte(base_port));
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outb(data, base_port + UART8250_TBR);
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}
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static void uart8250_tx_flush(unsigned int base_port)
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{
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unsigned long int i = FIFO_TIMEOUT;
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while (i-- && !(inb(base_port + UART8250_LSR) & UART8250_LSR_TEMT));
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}
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static int uart8250_can_rx_byte(unsigned int base_port)
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{
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return inb(base_port + UART8250_LSR) & UART8250_LSR_DR;
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}
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static unsigned char uart8250_rx_byte(unsigned int base_port)
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{
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unsigned long int i = SINGLE_CHAR_TIMEOUT;
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while (i && !uart8250_can_rx_byte(base_port))
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i--;
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if (i)
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return inb(base_port + UART8250_RBR);
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else
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return 0x0;
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}
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static void uart8250_init(unsigned int base_port, unsigned int divisor)
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{
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/* Disable interrupts */
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outb(0x0, base_port + UART8250_IER);
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/* Enable FIFOs */
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outb(UART8250_FCR_FIFO_EN, base_port + UART8250_FCR);
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/* assert DTR and RTS so the other end is happy */
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outb(UART8250_MCR_DTR | UART8250_MCR_RTS, base_port + UART8250_MCR);
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/* DLAB on */
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outb(UART8250_LCR_DLAB | CONFIG_TTYS0_LCS, base_port + UART8250_LCR);
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/* Set Baud Rate Divisor. 12 ==> 9600 Baud */
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outb(divisor & 0xFF, base_port + UART8250_DLL);
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outb((divisor >> 8) & 0xFF, base_port + UART8250_DLM);
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/* Set to 3 for 8N1 */
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outb(CONFIG_TTYS0_LCS, base_port + UART8250_LCR);
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}
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static const unsigned int bases[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 };
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uintptr_t uart_platform_base(unsigned int idx)
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{
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if (idx < ARRAY_SIZE(bases))
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return bases[idx];
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return 0;
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}
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void uart_init(unsigned int idx)
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{
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if (!CONFIG(DRIVERS_UART_8250IO_SKIP_INIT)) {
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unsigned int div;
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div = uart_baudrate_divisor(get_uart_baudrate(),
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uart_platform_refclk(), uart_input_clock_divider());
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uart8250_init(uart_platform_base(idx), div);
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}
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}
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void uart_tx_byte(unsigned int idx, unsigned char data)
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{
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uart8250_tx_byte(uart_platform_base(idx), data);
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}
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unsigned char uart_rx_byte(unsigned int idx)
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{
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return uart8250_rx_byte(uart_platform_base(idx));
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}
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void uart_tx_flush(unsigned int idx)
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{
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uart8250_tx_flush(uart_platform_base(idx));
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}
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enum cb_err fill_lb_serial(struct lb_serial *serial)
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{
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serial->type = LB_SERIAL_TYPE_IO_MAPPED;
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serial->baseaddr = uart_platform_base(CONFIG_UART_FOR_CONSOLE);
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serial->baud = get_uart_baudrate();
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serial->regwidth = 1;
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serial->input_hertz = uart_platform_refclk();
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return CB_SUCCESS;
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}
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