1 /* 2 * Copyright (C) 2011 by Vladimir Zapolskiy <vz@mleia.com> 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 2 7 * of the License, or (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 17 * MA 02110-1301, USA. 18 */ 19 20 #include <common.h> 21 #include <asm/arch/cpu.h> 22 #include <asm/arch/clk.h> 23 #include <asm/arch/uart.h> 24 #include <asm/io.h> 25 26 static struct clk_pm_regs *clk = (struct clk_pm_regs *)CLK_PM_BASE; 27 static struct uart_ctrl_regs *ctrl = (struct uart_ctrl_regs *)UART_CTRL_BASE; 28 29 void lpc32xx_uart_init(unsigned int uart_id) 30 { 31 if (uart_id < 1 || uart_id > 7) 32 return; 33 34 /* Disable loopback mode, if it is set by S1L bootloader */ 35 clrbits_le32(&ctrl->loop, 36 UART_LOOPBACK(CONFIG_SYS_LPC32XX_UART)); 37 38 if (uart_id < 3 || uart_id > 6) 39 return; 40 41 /* Enable UART system clock */ 42 setbits_le32(&clk->uartclk_ctrl, CLK_UART(uart_id)); 43 44 /* Set UART into autoclock mode */ 45 clrsetbits_le32(&ctrl->clkmode, 46 UART_CLKMODE_MASK(uart_id), 47 UART_CLKMODE_AUTO(uart_id)); 48 49 /* Bypass pre-divider of UART clock */ 50 writel(CLK_UART_X_DIV(1) | CLK_UART_Y_DIV(1), 51 &clk->u3clk + (uart_id - 3)); 52 } 53