arch/arm/cpu/arm926ejs/lpc32xx/devices.c

/*
 * Copyright (C) 2011 by 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>

static struct clk_pm_regs    *clk  = (struct clk_pm_regs *)CLK_PM_BASE;
static struct uart_ctrl_regs *ctrl = (struct uart_ctrl_regs *)UART_CTRL_BASE;

void lpc32xx_uart_init(unsigned int uart_id)
{
	if (uart_id < 1 || uart_id > 7)
		return;

	/* Disable loopback mode, if it is set by S1L bootloader */
	clrbits_le32(&ctrl->loop,
		     UART_LOOPBACK(CONFIG_SYS_LPC32XX_UART));

	if (uart_id < 3 || uart_id > 6)
		return;

	/* Enable UART system clock */
	setbits_le32(&clk->uartclk_ctrl, CLK_UART(uart_id));

	/* Set UART into autoclock mode */
	clrsetbits_le32(&ctrl->clkmode,
			UART_CLKMODE_MASK(uart_id),
			UART_CLKMODE_AUTO(uart_id));

	/* Bypass pre-divider of UART clock */
	writel(CLK_UART_X_DIV(1) | CLK_UART_Y_DIV(1),
	       &clk->u3clk + (uart_id - 3));
}