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/*
* Xilinx UARTLITE bootloader driver
*
* Copyright (C) 2007 Secret Lab Technologies Ltd.
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
* kind, whether express or implied.
*/
#include <stdarg.h>
#include <stddef.h>
#include "types.h"
#include "string.h"
#include "stdio.h"
#include "io.h"
#include "ops.h"
#define ULITE_RX 0x00
#define ULITE_TX 0x04
#define ULITE_STATUS 0x08
#define ULITE_CONTROL 0x0c
#define ULITE_STATUS_RXVALID 0x01
#define ULITE_STATUS_TXFULL 0x08
#define ULITE_CONTROL_RST_RX 0x02
static void * reg_base;
static int uartlite_open(void)
{
/* Clear the RX FIFO */
out_be32(reg_base + ULITE_CONTROL, ULITE_CONTROL_RST_RX);
return 0;
}
static void uartlite_putc(unsigned char c)
{
u32 reg = ULITE_STATUS_TXFULL;
while (reg & ULITE_STATUS_TXFULL) /* spin on TXFULL bit */
reg = in_be32(reg_base + ULITE_STATUS);
out_be32(reg_base + ULITE_TX, c);
}
static unsigned char uartlite_getc(void)
{
u32 reg = 0;
while (!(reg & ULITE_STATUS_RXVALID)) /* spin waiting for RXVALID bit */
reg = in_be32(reg_base + ULITE_STATUS);
return in_be32(reg_base + ULITE_RX);
}
static u8 uartlite_tstc(void)
{
u32 reg = in_be32(reg_base + ULITE_STATUS);
return reg & ULITE_STATUS_RXVALID;
}
int uartlite_console_init(void *devp, struct serial_console_data *scdp)
{
int n;
unsigned long reg_phys;
n = getprop(devp, "virtual-reg", ®_base, sizeof(reg_base));
if (n != sizeof(reg_base)) {
if (!dt_xlate_reg(devp, 0, ®_phys, NULL))
return -1;
reg_base = (void *)reg_phys;
}
scdp->open = uartlite_open;
scdp->putc = uartlite_putc;
scdp->getc = uartlite_getc;
scdp->tstc = uartlite_tstc;
scdp->close = NULL;
return 0;
}
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