[people/ms/u-boot.git] / drivers / serial / mcfserial.c

/*
 * (C) Copyright 2004, Freescale, Inc
 * TsiChung Liew, Tsi-Chung.Liew@freescale.com.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 *
 */

/*
 * Minimal serial functions needed to use one of the uart ports
 * as serial console interface.
 */

#include <common.h>
#include <asm/mcfuart.h>

DECLARE_GLOBAL_DATA_PTR;

#ifdef CONFIG_MCFSERIAL
int serial_init(void)
{
	volatile uart_t *uart;
	u32 counter;

	uart = (volatile uart_t *)(CFG_UART_BASE);

	/* write to SICR: SIM2 = uart mode,dcd does not affect rx */
	uart->ucr = UART_UCR_RESET_RX;
	uart->ucr = UART_UCR_RESET_TX;
	uart->ucr = UART_UCR_RESET_ERROR;
	uart->ucr = UART_UCR_RESET_MR;
	__asm__("nop");

	uart->uimr = 0;

	/* write to CSR: RX/TX baud rate from timers */
	uart->ucsr = (UART_UCSR_RCS_SYS_CLK | UART_UCSR_TCS_SYS_CLK);

	uart->umr = (UART_UMR_BC_8 | UART_UMR_PM_NONE);
	uart->umr = UART_UMR_SB_STOP_BITS_1;

	/* Setting up BaudRate */
	counter = (u32) (gd->bus_clk / (gd->baudrate));
	counter >>= 5;

	/* write to CTUR: divide counter upper byte */
	uart->ubg1 = (u8) ((counter & 0xff00) >> 8);
	/* write to CTLR: divide counter lower byte */
	uart->ubg2 = (u8) (counter & 0x00ff);

	uart->ucr = (UART_UCR_RX_ENABLED | UART_UCR_TX_ENABLED);

	return (0);
}

void serial_putc(const char c)
{
	volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE);

	if (c == '\n')
		serial_putc('\r');

	/* Wait for last character to go. */
	while (!(uart->usr & UART_USR_TXRDY)) ;

	uart->utb = c;
}

void serial_puts(const char *s)
{
	while (*s) {
		serial_putc(*s++);
	}
}

int serial_getc(void)
{
	volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE);

	/* Wait for a character to arrive. */
	while (!(uart->usr & UART_USR_RXRDY)) ;
	return uart->urb;
}

int serial_tstc(void)
{
	volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE);

	return (uart->usr & UART_USR_RXRDY);
}

void serial_setbrg(void)
{
	volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE);
	u32 counter;

	counter = ((gd->bus_clk / gd->baudrate)) >> 5;
	counter++;

	/* write to CTUR: divide counter upper byte */
	uart->ubg1 = ((counter & 0xff00) >> 8);
	/* write to CTLR: divide counter lower byte */
	uart->ubg2 = (counter & 0x00ff);

	uart->ucr = UART_UCR_RESET_RX;
	uart->ucr = UART_UCR_RESET_TX;

	uart->ucr = UART_UCR_RX_ENABLED | UART_UCR_TX_ENABLED;
}
#endif				/* CONFIG_MCFSERIAL */
Commit	Line	Data
8e585f02 TL	1	/*
	2	* (C) Copyright 2004, Freescale, Inc
	3	* TsiChung Liew, Tsi-Chung.Liew@freescale.com.
	4	*
	5	* See file CREDITS for list of people who contributed to this
	6	* project.
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License as
	10	* published by the Free Software Foundation; either version 2 of
	11	* the License, or (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	21	* MA 02111-1307 USA
	22	*
	23	*/
	24
	25	/*
	26	* Minimal serial functions needed to use one of the uart ports
	27	* as serial console interface.
	28	*/
	29
	30	#include <common.h>
	31	#include <asm/mcfuart.h>
	32
	33	DECLARE_GLOBAL_DATA_PTR;
	34
	35	#ifdef CONFIG_MCFSERIAL
	36	int serial_init(void)
	37	{
	38	volatile uart_t *uart;
	39	u32 counter;
	40
	41	uart = (volatile uart_t *)(CFG_UART_BASE);
	42
	43	/* write to SICR: SIM2 = uart mode,dcd does not affect rx */
	44	uart->ucr = UART_UCR_RESET_RX;
	45	uart->ucr = UART_UCR_RESET_TX;
	46	uart->ucr = UART_UCR_RESET_ERROR;
	47	uart->ucr = UART_UCR_RESET_MR;
	48	__asm__("nop");
	49
	50	uart->uimr = 0;
	51
	52	/* write to CSR: RX/TX baud rate from timers */
	53	uart->ucsr = (UART_UCSR_RCS_SYS_CLK \| UART_UCSR_TCS_SYS_CLK);
	54
	55	uart->umr = (UART_UMR_BC_8 \| UART_UMR_PM_NONE);
	56	uart->umr = UART_UMR_SB_STOP_BITS_1;
	57
	58	/* Setting up BaudRate */
	59	counter = (u32) (gd->bus_clk / (gd->baudrate));
	60	counter >>= 5;
	61
	62	/* write to CTUR: divide counter upper byte */
	63	uart->ubg1 = (u8) ((counter & 0xff00) >> 8);
	64	/* write to CTLR: divide counter lower byte */
65	uart->ubg2 = (u8) (counter & 0x00ff);
66
67	uart->ucr = (UART_UCR_RX_ENABLED \| UART_UCR_TX_ENABLED);
68
69	return (0);
70	}
71
72	void serial_putc(const char c)
73	{
74	volatile uart_t uart = (volatile uart_t )(CFG_UART_BASE);
75
76	if (c == '\n')
77	serial_putc('\r');
78
79	/* Wait for last character to go. */
80	while (!(uart->usr & UART_USR_TXRDY)) ;
81
82	uart->utb = c;
83	}
84
85	void serial_puts(const char *s)
86	{
87	while (*s) {
88	serial_putc(*s++);
89	}
90	}
91
92	int serial_getc(void)
93	{
94	volatile uart_t uart = (volatile uart_t )(CFG_UART_BASE);
95
96	/* Wait for a character to arrive. */
97	while (!(uart->usr & UART_USR_RXRDY)) ;
98	return uart->urb;
99	}
100
101	int serial_tstc(void)
102	{
103	volatile uart_t uart = (volatile uart_t )(CFG_UART_BASE);
104
105	return (uart->usr & UART_USR_RXRDY);
106	}
107
108	void serial_setbrg(void)
109	{
110	volatile uart_t uart = (volatile uart_t )(CFG_UART_BASE);
111	u32 counter;
112
113	counter = ((gd->bus_clk / gd->baudrate)) >> 5;
114	counter++;
115
116	/* write to CTUR: divide counter upper byte */
117	uart->ubg1 = ((counter & 0xff00) >> 8);
118	/* write to CTLR: divide counter lower byte */
119	uart->ubg2 = (counter & 0x00ff);
120
121	uart->ucr = UART_UCR_RESET_RX;
122	uart->ucr = UART_UCR_RESET_TX;
123
124	uart->ucr = UART_UCR_RX_ENABLED \| UART_UCR_TX_ENABLED;
125	}
126	#endif /* CONFIG_MCFSERIAL */