src/drivers/uart/pl011.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <device/mmio.h>
   4 #include <boot/coreboot_tables.h>
   5 #include <console/uart.h>
   6 #include <drivers/uart/pl011.h>
   7
   8 void uart_init(unsigned int idx)
   9 {
  10 }
  11
  12 void uart_tx_byte(unsigned int idx, unsigned char data)
  13 {
  14         struct pl011_uart *regs = uart_platform_baseptr(idx);
  15
  16         write8(&regs->dr, data);
  17         uart_tx_flush(idx);
  18 }
  19
  20 void uart_tx_flush(unsigned int idx)
  21 {
  22         struct pl011_uart *regs = uart_platform_baseptr(idx);
  23
  24         /* FIXME: add a timeout */
  25         while (!(read32(&regs->fr) & PL011_UARTFR_TXFE))
  26                 ;
  27 }
  28
  29 unsigned char uart_rx_byte(unsigned int idx)
  30 {
  31         struct pl011_uart *regs = uart_platform_baseptr(idx);
  32
  33         while (read32(&regs->fr) & PL011_UARTFR_RXFE)
  34                 ;
  35         return read8(&regs->dr);
  36 }
  37
  38 enum cb_err fill_lb_serial(struct lb_serial *serial)
  39 {
  40         serial->type = LB_SERIAL_TYPE_MEMORY_MAPPED;
  41         serial->baseaddr = uart_platform_base(CONFIG_UART_FOR_CONSOLE);
  42         serial->baud = get_uart_baudrate();
  43         serial->regwidth = 1;
  44         serial->input_hertz = uart_platform_refclk();
  45
  46         return CB_SUCCESS;
  47 }