2 * Copyright (C) 2011 by Vladimir Zapolskiy <vz@mleia.com>
4 * SPDX-License-Identifier: GPL-2.0+
8 #include <asm/arch/cpu.h>
9 #include <asm/arch/clk.h>
10 #include <asm/arch/uart.h>
13 static struct clk_pm_regs *clk = (struct clk_pm_regs *)CLK_PM_BASE;
14 static struct uart_ctrl_regs *ctrl = (struct uart_ctrl_regs *)UART_CTRL_BASE;
16 void lpc32xx_uart_init(unsigned int uart_id)
18 if (uart_id < 1 || uart_id > 7)
21 /* Disable loopback mode, if it is set by S1L bootloader */
22 clrbits_le32(&ctrl->loop,
23 UART_LOOPBACK(CONFIG_SYS_LPC32XX_UART));
25 if (uart_id < 3 || uart_id > 6)
28 /* Enable UART system clock */
29 setbits_le32(&clk->uartclk_ctrl, CLK_UART(uart_id));
31 /* Set UART into autoclock mode */
32 clrsetbits_le32(&ctrl->clkmode,
33 UART_CLKMODE_MASK(uart_id),
34 UART_CLKMODE_AUTO(uart_id));
36 /* Bypass pre-divider of UART clock */
37 writel(CLK_UART_X_DIV(1) | CLK_UART_Y_DIV(1),
38 &clk->u3clk + (uart_id - 3));