mirror of
https://github.com/u-boot/u-boot.git
synced 2024-11-29 07:33:29 +08:00
1a4596601f
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
87 lines
1.8 KiB
C
87 lines
1.8 KiB
C
/*
|
|
* Copyright (C) 2011 Vladimir Zapolskiy <vz@mleia.com>
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <asm/arch/cpu.h>
|
|
#include <asm/arch/clk.h>
|
|
#include <asm/arch/uart.h>
|
|
#include <asm/io.h>
|
|
#include <serial.h>
|
|
#include <linux/compiler.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
static struct hsuart_regs *hsuart = (struct hsuart_regs *)HS_UART_BASE;
|
|
|
|
static void lpc32xx_serial_setbrg(void)
|
|
{
|
|
u32 div;
|
|
|
|
/* UART rate = PERIPH_CLK / ((HSU_RATE + 1) x 14) */
|
|
div = (get_serial_clock() / 14 + gd->baudrate / 2) / gd->baudrate - 1;
|
|
if (div > 255)
|
|
div = 255;
|
|
|
|
writel(div, &hsuart->rate);
|
|
}
|
|
|
|
static int lpc32xx_serial_getc(void)
|
|
{
|
|
while (!(readl(&hsuart->level) & HSUART_LEVEL_RX))
|
|
/* NOP */;
|
|
|
|
return readl(&hsuart->rx) & HSUART_RX_DATA;
|
|
}
|
|
|
|
static void lpc32xx_serial_putc(const char c)
|
|
{
|
|
writel(c, &hsuart->tx);
|
|
|
|
/* Wait for character to be sent */
|
|
while (readl(&hsuart->level) & HSUART_LEVEL_TX)
|
|
/* NOP */;
|
|
}
|
|
|
|
static int lpc32xx_serial_tstc(void)
|
|
{
|
|
if (readl(&hsuart->level) & HSUART_LEVEL_RX)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int lpc32xx_serial_init(void)
|
|
{
|
|
lpc32xx_serial_setbrg();
|
|
|
|
/* Disable hardware RTS and CTS flow control, set up RX and TX FIFO */
|
|
writel(HSUART_CTRL_TMO_16 | HSUART_CTRL_HSU_OFFSET(20) |
|
|
HSUART_CTRL_HSU_RX_TRIG_32 | HSUART_CTRL_HSU_TX_TRIG_0,
|
|
&hsuart->ctrl);
|
|
return 0;
|
|
}
|
|
|
|
static struct serial_device lpc32xx_serial_drv = {
|
|
.name = "lpc32xx_serial",
|
|
.start = lpc32xx_serial_init,
|
|
.stop = NULL,
|
|
.setbrg = lpc32xx_serial_setbrg,
|
|
.putc = lpc32xx_serial_putc,
|
|
.puts = default_serial_puts,
|
|
.getc = lpc32xx_serial_getc,
|
|
.tstc = lpc32xx_serial_tstc,
|
|
};
|
|
|
|
void lpc32xx_serial_initialize(void)
|
|
{
|
|
serial_register(&lpc32xx_serial_drv);
|
|
}
|
|
|
|
__weak struct serial_device *default_serial_console(void)
|
|
{
|
|
return &lpc32xx_serial_drv;
|
|
}
|