2 * Copyright (C) 2011 Vladimir Zapolskiy <vz@mleia.com>
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.
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.
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,
21 #include <asm/arch/cpu.h>
22 #include <asm/arch/clk.h>
23 #include <asm/arch/uart.h>
26 DECLARE_GLOBAL_DATA_PTR;
28 static struct hsuart_regs *hsuart = (struct hsuart_regs *)HS_UART_BASE;
30 static void lpc32xx_hsuart_set_baudrate(void)
34 /* UART rate = PERIPH_CLK / ((HSU_RATE + 1) x 14) */
35 div = (get_serial_clock() / 14 + gd->baudrate / 2) / gd->baudrate - 1;
39 writel(div, &hsuart->rate);
42 static int lpc32xx_hsuart_getc(void)
44 while (!(readl(&hsuart->level) & HSUART_LEVEL_RX))
47 return readl(&hsuart->rx) & HSUART_RX_DATA;
50 static void lpc32xx_hsuart_putc(const char c)
52 writel(c, &hsuart->tx);
54 /* Wait for character to be sent */
55 while (readl(&hsuart->level) & HSUART_LEVEL_TX)
59 static int lpc32xx_hsuart_tstc(void)
61 if (readl(&hsuart->level) & HSUART_LEVEL_RX)
67 static void lpc32xx_hsuart_init(void)
69 lpc32xx_hsuart_set_baudrate();
71 /* Disable hardware RTS and CTS flow control, set up RX and TX FIFO */
72 writel(HSUART_CTRL_TMO_16 | HSUART_CTRL_HSU_OFFSET(20) |
73 HSUART_CTRL_HSU_RX_TRIG_32 | HSUART_CTRL_HSU_TX_TRIG_0,
77 void serial_setbrg(void)
79 return lpc32xx_hsuart_set_baudrate();
82 void serial_putc(const char c)
84 lpc32xx_hsuart_putc(c);
86 /* If \n, also do \r */
88 lpc32xx_hsuart_putc('\r');
93 return lpc32xx_hsuart_getc();
96 void serial_puts(const char *s)
102 int serial_tstc(void)
104 return lpc32xx_hsuart_tstc();
107 int serial_init(void)
109 lpc32xx_hsuart_init();