/* * (c) 2004 Sascha Hauer <sascha@saschahauer.de> * * 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 * */#include <common.h>#if defined (CONFIG_IMX)#include <asm/arch/imx-regs.h>#ifndef CONFIG_IMX_SERIAL_NONE#if defined CONFIG_IMX_SERIAL1#define UART_BASE IMX_UART1_BASE#elif defined CONFIG_IMX_SERIAL2#define UART_BASE IMX_UART2_BASE#else#error "define CONFIG_IMX_SERIAL1, CONFIG_IMX_SERIAL2 or CONFIG_IMX_SERIAL_NONE"#endifstruct imx_serial {	volatile uint32_t urxd[16];	volatile uint32_t utxd[16];	volatile uint32_t ucr1;	volatile uint32_t ucr2;	volatile uint32_t ucr3;	volatile uint32_t ucr4;	volatile uint32_t ufcr;	volatile uint32_t usr1;	volatile uint32_t usr2;	volatile uint32_t uesc;	volatile uint32_t utim;	volatile uint32_t ubir;	volatile uint32_t ubmr;	volatile uint32_t ubrc;	volatile uint32_t bipr[4];	volatile uint32_t bmpr[4];	volatile uint32_t uts;};void serial_setbrg (void){	serial_init();}extern void imx_gpio_mode(int gpio_mode);/* * Initialise the serial port with the given baudrate. The settings * are always 8 data bits, no parity, 1 stop bit, no start bits. * */int serial_init (void){	volatile struct imx_serial* base = (struct imx_serial *)UART_BASE;#ifdef CONFIG_IMX_SERIAL1	imx_gpio_mode(PC11_PF_UART1_TXD);	imx_gpio_mode(PC12_PF_UART1_RXD);#else	imx_gpio_mode(PB30_PF_UART2_TXD);	imx_gpio_mode(PB31_PF_UART2_RXD);#endif	/* Disable UART */	base->ucr1 &= ~UCR1_UARTEN;	/* Set to default POR state */	base->ucr1 = 0x00000004;	base->ucr2 = 0x00000000;	base->ucr3 = 0x00000000;	base->ucr4 = 0x00008040;	base->uesc = 0x0000002B;	base->utim = 0x00000000;	base->ubir = 0x00000000;	base->ubmr = 0x00000000;	base->uts  = 0x00000000;	/* Set clocks */	base->ucr4 |= UCR4_REF16;	/* Configure FIFOs */	base->ufcr = 0xa81;	/* Set the numerator value minus one of the BRM ratio */	base->ubir = (CONFIG_BAUDRATE / 100) - 1;	/* Set the denominator value minus one of the BRM ratio	*/	base->ubmr = 10000 - 1;	/* Set to 8N1 */	base->ucr2 &= ~UCR2_PREN;	base->ucr2 |= UCR2_WS;	base->ucr2 &= ~UCR2_STPB;	/* Ignore RTS */	base->ucr2 |= UCR2_IRTS;	/* Enable UART */	base->ucr1 |= UCR1_UARTEN | UCR1_UARTCLKEN;	/* Enable FIFOs */	base->ucr2 |= UCR2_SRST | UCR2_RXEN | UCR2_TXEN;  	/* Clear status flags */	base->usr2 |= USR2_ADET  |	          USR2_DTRF  |	          USR2_IDLE  |	          USR2_IRINT |	          USR2_WAKE  |	          USR2_RTSF  |	          USR2_BRCD  |	          USR2_ORE   |	          USR2_RDR;  	/* Clear status flags */	base->usr1 |= USR1_PARITYERR |	          USR1_RTSD      |	          USR1_ESCF      |	          USR1_FRAMERR   |	          USR1_AIRINT    |	          USR1_AWAKE;	return (0);}/* * Read a single byte from the serial port. Returns 1 on success, 0 * otherwise. When the function is successful, the character read is * written into its argument c. */int serial_getc (void){	volatile struct imx_serial* base = (struct imx_serial *)UART_BASE;	unsigned char ch;	while(base->uts & UTS_RXEMPTY);	ch = (char)base->urxd[0];	return ch;}#ifdef CONFIG_HWFLOWstatic int hwflow = 0; /* turned off by default */int hwflow_onoff(int on){}#endif/* * Output a single byte to the serial port. */void serial_putc (const char c){	volatile struct imx_serial* base = (struct imx_serial *)UART_BASE;	/* Wait for Tx FIFO not full */	while (base->uts & UTS_TXFULL);	base->utxd[0] = c;	/* If \n, also do \r */	if (c == '\n')		serial_putc ('\r');}/* * Test whether a character is in the RX buffer */int serial_tstc (void){	volatile struct imx_serial* base = (struct imx_serial *)UART_BASE;	/* If receive fifo is empty, return false */	if (base->uts & UTS_RXEMPTY)		return 0;	return 1;}voidserial_puts (const char *s){	while (*s) {		serial_putc (*s++);	}}#endif /* CONFIG_IMX_SERIAL_NONE */#endif /* defined CONFIG_IMX */