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Specify address of UART device to use as a console 

This patch adds the ability to specify the base address of a UART
device for initialising the console. This allows a boot loader stage
to use a different UART device from UART0 (default) for the console.

Change-Id: Ie60b927389ae26085cfc90d22a564ff83ba62955
This commit is contained in:
Achin Gupta 2014-02-09 13:47:08 +00:00 committed by Dan Handley
parent a0cd989dd5
commit 8aa0cd43a8
4 changed files with 28 additions and 17 deletions
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2
drivers/arm/peripherals/pl011/console.h
View File

@ -31,7 +31,7 @@
#ifndef __CONSOLE_H__
#define __CONSOLE_H__
void console_init(void);
void console_init(unsigned long base_addr);
int console_putc(int c);
int console_getc(void);

35
drivers/arm/peripherals/pl011/pl011.c
View File

@ -28,37 +28,43 @@
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <console.h>
#include <platform.h>
#include <pl011.h>
static unsigned long uart_base = PL011_BASE;
/*
* TODO: Console init functions shoule be in a console.c. This file should
* only contain the pl011 accessors.
*/
void console_init(void)
void console_init(unsigned long base_addr)
{
unsigned int divisor;
/* Initialise internal base address variable */
uart_base = base_addr;
/* Baud Rate */
#if defined(PL011_INTEGER) && defined(PL011_FRACTIONAL)
mmio_write_32(PL011_BASE + UARTIBRD, PL011_INTEGER);
mmio_write_32(PL011_BASE + UARTFBRD, PL011_FRACTIONAL);
mmio_write_32(uart_base + UARTIBRD, PL011_INTEGER);
mmio_write_32(uart_base + UARTFBRD, PL011_FRACTIONAL);
#else
divisor = (PL011_CLK_IN_HZ * 4) / PL011_BAUDRATE;
mmio_write_32(PL011_BASE + UARTIBRD, divisor >> 6);
mmio_write_32(PL011_BASE + UARTFBRD, divisor & 0x3F);
mmio_write_32(uart_base + UARTIBRD, divisor >> 6);
mmio_write_32(uart_base + UARTFBRD, divisor & 0x3F);
#endif
mmio_write_32(PL011_BASE + UARTLCR_H, PL011_LINE_CONTROL);
mmio_write_32(uart_base + UARTLCR_H, PL011_LINE_CONTROL);
/* Clear any pending errors */
mmio_write_32(PL011_BASE + UARTECR, 0);
mmio_write_32(uart_base + UARTECR, 0);
/* Enable tx, rx, and uart overall */
mmio_write_32(PL011_BASE + UARTCR,
mmio_write_32(uart_base + UARTCR,
PL011_UARTCR_RXE | PL011_UARTCR_TXE |
PL011_UARTCR_UARTEN);
}
@ -68,15 +74,16 @@ int console_putc(int c)
if (c == '\n') {
console_putc('\r');
}
while ((mmio_read_32(PL011_BASE + UARTFR) & PL011_UARTFR_TXFE)
== 0) ;
mmio_write_32(PL011_BASE + UARTDR, c);
while ((mmio_read_32(uart_base + UARTFR) & PL011_UARTFR_TXFE) == 0)
;
mmio_write_32(uart_base + UARTDR, c);
return c;
}
int console_getc(void)
{
while ((mmio_read_32(PL011_BASE + UARTFR) & PL011_UARTFR_RXFE)
!= 0) ;
return mmio_read_32(PL011_BASE + UARTDR);
while ((mmio_read_32(uart_base + UARTFR) & PL011_UARTFR_RXFE) != 0)
;
return mmio_read_32(uart_base + UARTDR);
}

2
plat/fvp/bl1_plat_setup.c
View File

@ -116,7 +116,7 @@ void bl1_platform_setup(void)
mmio_write_32(SYS_CNTCTL_BASE + CNTCR_OFF, CNTCR_EN);
/* Initialize the console */
console_init();
console_init(PL011_UART0_BASE);
return;
}

6
plat/fvp/platform.h
View File

@ -299,7 +299,11 @@
/*******************************************************************************
* PL011 related constants
******************************************************************************/
#define PL011_BASE 0x1c090000
#define PL011_UART0_BASE 0x1c090000
#define PL011_UART1_BASE 0x1c0a0000
#define PL011_UART2_BASE 0x1c0b0000
#define PL011_UART3_BASE 0x1c0c0000
#define PL011_BASE PL011_UART0_BASE
/*******************************************************************************
* Declarations and constants to access the mailboxes safely. Each mailbox is