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uart8250mem: Add wrapper for MMIO register access 

For some UART hardware registers are 32 bits wide, so we will need
base_port + reg << 2 instead. Prepare for that change and unification of
MMIO between ARM and x86.

Change-Id: I5fa2c2f7ee4872499a01754c1ba872a8addf499c
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/7793
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
This commit is contained in:
Kyösti Mälkki 2014-12-13 16:39:40 +02:00
parent e51373bd32
commit 164ac0a429
1 changed files with 35 additions and 24 deletions
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59
src/drivers/uart/uart8250mem.c
View File

@ -22,6 +22,7 @@
#include <console/uart.h>
#include <device/device.h>
#include <delay.h>
#include <stdint.h>
#include "uart8250reg.h"
/* Should support 8250, 16450, 16550, 16550A type UARTs */
@ -33,65 +34,75 @@
#define SINGLE_CHAR_TIMEOUT (50 * 1000)
#define FIFO_TIMEOUT (16 * SINGLE_CHAR_TIMEOUT)
static int uart8250_mem_can_tx_byte(unsigned base_port)
static uint8_t uart8250_read(void *base, uint8_t reg)
{
return read8(base_port + UART8250_LSR) & UART8250_LSR_THRE;
return read8((uintptr_t) (base + reg));
}
static void uart8250_mem_tx_byte(unsigned base_port, unsigned char data)
static void uart8250_write(void *base, uint8_t reg, uint8_t data)
{
write8((uintptr_t) (base + reg), data);
}
static int uart8250_mem_can_tx_byte(void *base)
{
return uart8250_read(base, UART8250_LSR) & UART8250_LSR_THRE;
}
static void uart8250_mem_tx_byte(void *base, unsigned char data)
{
unsigned long int i = SINGLE_CHAR_TIMEOUT;
while(i-- && !uart8250_mem_can_tx_byte(base_port))
while(i-- && !uart8250_mem_can_tx_byte(base))
udelay(1);
write8(base_port + UART8250_TBR, data);
uart8250_write(base, UART8250_TBR, data);
}
static void uart8250_mem_tx_flush(unsigned base_port)
static void uart8250_mem_tx_flush(void *base)
{
unsigned long int i = FIFO_TIMEOUT;
while(i-- && !(read8(base_port + UART8250_LSR) & UART8250_LSR_TEMT))
while(i-- && !(uart8250_read(base, UART8250_LSR) & UART8250_LSR_TEMT))
udelay(1);
}
static int uart8250_mem_can_rx_byte(unsigned base_port)
static int uart8250_mem_can_rx_byte(void *base)
{
return read8(base_port + UART8250_LSR) & UART8250_LSR_DR;
return uart8250_read(base, UART8250_LSR) & UART8250_LSR_DR;
}
static unsigned char uart8250_mem_rx_byte(unsigned base_port)
static unsigned char uart8250_mem_rx_byte(void *base)
{
unsigned long int i = SINGLE_CHAR_TIMEOUT;
while(i-- && !uart8250_mem_can_rx_byte(base_port))
while(i-- && !uart8250_mem_can_rx_byte(base))
udelay(1);
if (i)
return read8(base_port + UART8250_RBR);
return uart8250_read(base, UART8250_RBR);
else
return 0x0;
}
static void uart8250_mem_init(unsigned base_port, unsigned divisor)
static void uart8250_mem_init(void *base, unsigned divisor)
{
/* Disable interrupts */
write8(base_port + UART8250_IER, 0x0);
uart8250_write(base, UART8250_IER, 0x0);
/* Enable FIFOs */
write8(base_port + UART8250_FCR, UART8250_FCR_FIFO_EN);
uart8250_write(base, UART8250_FCR, UART8250_FCR_FIFO_EN);
/* Assert DTR and RTS so the other end is happy */
write8(base_port + UART8250_MCR, UART8250_MCR_DTR | UART8250_MCR_RTS);
uart8250_write(base, UART8250_MCR, UART8250_MCR_DTR | UART8250_MCR_RTS);
/* DLAB on */
write8(base_port + UART8250_LCR, UART8250_LCR_DLAB | CONFIG_TTYS0_LCS);
uart8250_write(base, UART8250_LCR, UART8250_LCR_DLAB | CONFIG_TTYS0_LCS);
write8(base_port + UART8250_DLL, divisor & 0xFF);
write8(base_port + UART8250_DLM, (divisor >> 8) & 0xFF);
uart8250_write(base, UART8250_DLL, divisor & 0xFF);
uart8250_write(base, UART8250_DLM, (divisor >> 8) & 0xFF);
/* Set to 3 for 8N1 */
write8(base_port + UART8250_LCR, CONFIG_TTYS0_LCS);
uart8250_write(base, UART8250_LCR, CONFIG_TTYS0_LCS);
}
void uart_init(int idx)
{
u32 base = uart_platform_base(idx);
void *base = uart_platform_baseptr(idx);
if (!base)
return;
@ -102,7 +113,7 @@ void uart_init(int idx)
void uart_tx_byte(int idx, unsigned char data)
{
u32 base = uart_platform_base(idx);
void *base = uart_platform_baseptr(idx);
if (!base)
return;
uart8250_mem_tx_byte(base, data);
@ -110,7 +121,7 @@ void uart_tx_byte(int idx, unsigned char data)
unsigned char uart_rx_byte(int idx)
{
u32 base = uart_platform_base(idx);
void *base = uart_platform_baseptr(idx);
if (!base)
return 0xff;
return uart8250_mem_rx_byte(base);
@ -118,7 +129,7 @@ unsigned char uart_rx_byte(int idx)
void uart_tx_flush(int idx)
{
u32 base = uart_platform_base(idx);
void *base = uart_platform_baseptr(idx);
if (!base)
return;
uart8250_mem_tx_flush(base);