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/*
* (C) Copyright 2002
* Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <linux/compiler.h>
#include <asm/arch/s3c24x0_cpu.h>
DECLARE_GLOBAL_DATA_PTR;
#ifdef CONFIG_SERIAL1
#define UART_NR S3C24X0_UART0
#elif defined(CONFIG_SERIAL2)
#define UART_NR S3C24X0_UART1
#elif defined(CONFIG_SERIAL3)
#define UART_NR S3C24X0_UART2
#else
#error "Bad: you didn't configure serial ..."
#endif
#include <asm/io.h>
#include <serial.h>
/* Multi serial device functions */
#define DECLARE_S3C_SERIAL_FUNCTIONS(port) \
int s3serial##port##_init(void) \
{ \
return serial_init_dev(port); \
} \
void s3serial##port##_setbrg(void) \
{ \
serial_setbrg_dev(port); \
} \
int s3serial##port##_getc(void) \
{ \
return serial_getc_dev(port); \
} \
int s3serial##port##_tstc(void) \
{ \
return serial_tstc_dev(port); \
} \
void s3serial##port##_putc(const char c) \
{ \
serial_putc_dev(port, c); \
} \
void s3serial##port##_puts(const char *s) \
{ \
serial_puts_dev(port, s); \
}
#define INIT_S3C_SERIAL_STRUCTURE(port, __name) { \
.name = __name, \
.start = s3serial##port##_init, \
.stop = NULL, \
.setbrg = s3serial##port##_setbrg, \
.getc = s3serial##port##_getc, \
.tstc = s3serial##port##_tstc, \
.putc = s3serial##port##_putc, \
.puts = s3serial##port##_puts, \
}
#ifdef CONFIG_HWFLOW
static int hwflow;
#endif
static void _serial_setbrg(const int dev_index)
{
struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
unsigned int reg = 0;
int i;
/* value is calculated so : (int)(PCLK/16./baudrate) -1 */
reg = get_PCLK() / (16 * gd->baudrate) - 1;
writel(reg, &uart->ubrdiv);
for (i = 0; i < 100; i++)
/* Delay */ ;
}
static inline void serial_setbrg_dev(unsigned int dev_index)
{
_serial_setbrg(dev_index);
}
/* Initialise the serial port. The settings are always 8 data bits, no parity,
* 1 stop bit, no start bits.
*/
static int serial_init_dev(const int dev_index)
{
struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
#ifdef CONFIG_HWFLOW
hwflow = 0; /* turned off by default */
#endif
/* FIFO enable, Tx/Rx FIFO clear */
writel(0x07, &uart->ufcon);
writel(0x0, &uart->umcon);
/* Normal,No parity,1 stop,8 bit */
writel(0x3, &uart->ulcon);
/*
* tx=level,rx=edge,disable timeout int.,enable rx error int.,
* normal,interrupt or polling
*/
writel(0x245, &uart->ucon);
#ifdef CONFIG_HWFLOW
writel(0x1, &uart->umcon); /* rts up */
#endif
/* FIXME: This is sooooooooooooooooooo ugly */
#if defined(CONFIG_ARCH_GTA02_v1) || defined(CONFIG_ARCH_GTA02_v2)
/* we need auto hw flow control on the gsm and gps port */
if (dev_index == 0 || dev_index == 1)
writel(0x10, &uart->umcon);
#endif
_serial_setbrg(dev_index);
return (0);
}
/*
* Read a single byte from the serial port. Returns 1 on success, 0
* otherwise. When the function is succesfull, the character read is
* written into its argument c.
*/
static int _serial_getc(const int dev_index)
{
struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
while (!(readl(&uart->utrstat) & 0x1))
/* wait for character to arrive */ ;
return readb(&uart->urxh) & 0xff;
}
static inline int serial_getc_dev(unsigned int dev_index)
{
return _serial_getc(dev_index);
}
#ifdef CONFIG_HWFLOW
int hwflow_onoff(int on)
{
switch (on) {
case 0:
default:
break; /* return current */
case 1:
hwflow = 1; /* turn on */
break;
case -1:
hwflow = 0; /* turn off */
break;
}
return hwflow;
}
#endif
/*
* Output a single byte to the serial port.
*/
static void _serial_putc(const char c, const int dev_index)
{
struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
while (!(readl(&uart->utrstat) & 0x2))
/* wait for room in the tx FIFO */ ;
#ifdef CONFIG_HWFLOW
while (hwflow && !(readl(&uart->umstat) & 0x1))
/* Wait for CTS up */ ;
#endif
writeb(c, &uart->utxh);
/* If \n, also do \r */
if (c == '\n')
serial_putc('\r');
}
static inline void serial_putc_dev(unsigned int dev_index, const char c)
{
_serial_putc(c, dev_index);
}
/*
* Test whether a character is in the RX buffer
*/
static int _serial_tstc(const int dev_index)
{
struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
return readl(&uart->utrstat) & 0x1;
}
static inline int serial_tstc_dev(unsigned int dev_index)
{
return _serial_tstc(dev_index);
}
static void _serial_puts(const char *s, const int dev_index)
{
while (*s) {
_serial_putc(*s++, dev_index);
}
}
static inline void serial_puts_dev(int dev_index, const char *s)
{
_serial_puts(s, dev_index);
}
DECLARE_S3C_SERIAL_FUNCTIONS(0);
struct serial_device s3c24xx_serial0_device =
INIT_S3C_SERIAL_STRUCTURE(0, "s3ser0");
DECLARE_S3C_SERIAL_FUNCTIONS(1);
struct serial_device s3c24xx_serial1_device =
INIT_S3C_SERIAL_STRUCTURE(1, "s3ser1");
DECLARE_S3C_SERIAL_FUNCTIONS(2);
struct serial_device s3c24xx_serial2_device =
INIT_S3C_SERIAL_STRUCTURE(2, "s3ser2");
__weak struct serial_device *default_serial_console(void)
{
#if defined(CONFIG_SERIAL1)
return &s3c24xx_serial0_device;
#elif defined(CONFIG_SERIAL2)
return &s3c24xx_serial1_device;
#elif defined(CONFIG_SERIAL3)
return &s3c24xx_serial2_device;
#else
#error "CONFIG_SERIAL? missing."
#endif
}
void s3c24xx_serial_initialize(void)
{
serial_register(&s3c24xx_serial0_device);
serial_register(&s3c24xx_serial1_device);
serial_register(&s3c24xx_serial2_device);
}
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