serial_ks8695.c
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/*
* serial.c -- KS8695 serial driver
*
* (C) Copyright 2004, Greg Ungerer <greg.ungerer@opengear.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/arch/platform.h>
#include <serial.h>
#include <linux/compiler.h>
#ifndef CONFIG_SERIAL1
#error "Bad: you didn't configure serial ..."
#endif
DECLARE_GLOBAL_DATA_PTR;
/*
* Define the UART hardware register access structure.
*/
struct ks8695uart {
unsigned int RX; /* 0x00 - Receive data (r) */
unsigned int TX; /* 0x04 - Transmit data (w) */
unsigned int FCR; /* 0x08 - Fifo Control (r/w) */
unsigned int LCR; /* 0x0c - Line Control (r/w) */
unsigned int MCR; /* 0x10 - Modem Control (r/w) */
unsigned int LSR; /* 0x14 - Line Status (r/w) */
unsigned int MSR; /* 0x18 - Modem Status (r/w) */
unsigned int BD; /* 0x1c - Baud Rate (r/w) */
unsigned int SR; /* 0x20 - Status (r/w) */
};
#define KS8695_UART_ADDR ((void *) (KS8695_IO_BASE + KS8695_UART_RX_BUFFER))
#define KS8695_UART_CLK 25000000
/*
* Under some circumstances we want to be "quiet" and not issue any
* serial output - though we want u-boot to otherwise work and behave
* the same. By default be noisy.
*/
int serial_console = 1;
static void ks8695_serial_setbrg(void)
{
volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
/* Set to global baud rate and 8 data bits, no parity, 1 stop bit*/
uartp->BD = KS8695_UART_CLK / gd->baudrate;
uartp->LCR = KS8695_UART_LINEC_WLEN8;
}
static int ks8695_serial_init(void)
{
serial_console = 1;
serial_setbrg();
return 0;
}
static void ks8695_serial_raw_putc(const char c)
{
volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
int i;
for (i = 0; (i < 0x100000); i++) {
if (uartp->LSR & KS8695_UART_LINES_TXFE)
break;
}
uartp->TX = c;
}
static void ks8695_serial_putc(const char c)
{
if (serial_console) {
ks8695_serial_raw_putc(c);
if (c == '\n')
ks8695_serial_raw_putc('\r');
}
}
static int ks8695_serial_tstc(void)
{
volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
if (serial_console)
return ((uartp->LSR & KS8695_UART_LINES_RXFE) ? 1 : 0);
return 0;
}
static int ks8695_serial_getc(void)
{
volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
while ((uartp->LSR & KS8695_UART_LINES_RXFE) == 0)
;
return (uartp->RX);
}
static struct serial_device ks8695_serial_drv = {
.name = "ks8695_serial",
.start = ks8695_serial_init,
.stop = NULL,
.setbrg = ks8695_serial_setbrg,
.putc = ks8695_serial_putc,
.puts = default_serial_puts,
.getc = ks8695_serial_getc,
.tstc = ks8695_serial_tstc,
};
void ks8695_serial_initialize(void)
{
serial_register(&ks8695_serial_drv);
}
__weak struct serial_device *default_serial_console(void)
{
return &ks8695_serial_drv;
}