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 void uart_fill_lb(void *data)
  39 {
  40         struct lb_serial serial;
  41         serial.type = LB_SERIAL_TYPE_MEMORY_MAPPED;
  42         serial.baseaddr = uart_platform_base(CONFIG_UART_FOR_CONSOLE);
  43         serial.baud = get_uart_baudrate();
  44         serial.regwidth = 1;
  45         serial.input_hertz = uart_platform_refclk();
  46         serial.uart_pci_addr = CONFIG_UART_PCI_ADDR;
  47         lb_add_serial(&serial, data);
  48
  49         lb_add_console(LB_TAG_CONSOLE_SERIAL8250MEM, data);
  50 }