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

/*
 * (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>
#include <asm/arch/imx-regs.h>

#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"
#endif

struct 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;
};

DECLARE_GLOBAL_DATA_PTR;

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;
	unsigned int ufcr_rfdiv;
	unsigned int refclk;

#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 baud rate.
	 *
	 * baud * 16   x
	 * --------- = -
	 *  refclk     y
	 *
	 * x - 1 = UBIR
	 * y - 1 = UBMR
	 *
	 * each register is 16 bits wide. refclk max is 96 MHz
	 *
	 */

	ufcr_rfdiv = ((base->ufcr) & UFCR_RFDIV) >> 7;
	if (ufcr_rfdiv == 6)
		ufcr_rfdiv = 7;
	else
		ufcr_rfdiv = 6 - ufcr_rfdiv;

	refclk = get_PERCLK1();
	refclk /= ufcr_rfdiv;

	/* Set the numerator value minus one of the BRM ratio */
	base->ubir = (gd->baudrate / 100) - 1;

	/* Set the denominator value minus one of the BRM ratio	*/
	base->ubmr = (refclk/(16 * 100)) - 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;

	/* 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_HWFLOW
static 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;
}

void
serial_puts (const char *s)
{
	while (*s) {
		serial_putc (*s++);
	}
}
Commit	Line	Data
281e00a3 WD	1	/*
	2	* (c) 2004 Sascha Hauer <sascha@saschahauer.de>
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation; either version 2 of the License, or
	7	* (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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	17	*
	18	*/
	19
	20	#include <common.h>
281e00a3 WD	21	#include <asm/arch/imx-regs.h>
281e00a3 WD	22
281e00a3 WD	23	#if defined CONFIG_IMX_SERIAL1
	24	#define UART_BASE IMX_UART1_BASE
	25	#elif defined CONFIG_IMX_SERIAL2
	26	#define UART_BASE IMX_UART2_BASE
	27	#else
	28	#error "define CONFIG_IMX_SERIAL1, CONFIG_IMX_SERIAL2 or CONFIG_IMX_SERIAL_NONE"
	29	#endif
	30
	31	struct imx_serial {
	32	volatile uint32_t urxd[16];
	33	volatile uint32_t utxd[16];
	34	volatile uint32_t ucr1;
	35	volatile uint32_t ucr2;
	36	volatile uint32_t ucr3;
	37	volatile uint32_t ucr4;
	38	volatile uint32_t ufcr;
	39	volatile uint32_t usr1;
	40	volatile uint32_t usr2;
	41	volatile uint32_t uesc;
	42	volatile uint32_t utim;
	43	volatile uint32_t ubir;
	44	volatile uint32_t ubmr;
	45	volatile uint32_t ubrc;
	46	volatile uint32_t bipr[4];
	47	volatile uint32_t bmpr[4];
	48	volatile uint32_t uts;
	49	};
	50
48fed405 AD	51	DECLARE_GLOBAL_DATA_PTR;
48fed405 AD	52
281e00a3 WD	53	void serial_setbrg (void)
	54	{
	55	serial_init();
	56	}
	57
	58	extern void imx_gpio_mode(int gpio_mode);
	59
	60	/*
	61	* Initialise the serial port with the given baudrate. The settings
	62	* are always 8 data bits, no parity, 1 stop bit, no start bits.
	63	*
	64	*/
	65	int serial_init (void)
	66	{
	67	volatile struct imx_serial* base = (struct imx_serial *)UART_BASE;
48fed405 AD	68	unsigned int ufcr_rfdiv;
	69	unsigned int refclk;
	70
281e00a3 WD	71	#ifdef CONFIG_IMX_SERIAL1
	72	imx_gpio_mode(PC11_PF_UART1_TXD);
	73	imx_gpio_mode(PC12_PF_UART1_RXD);
	74	#else
	75	imx_gpio_mode(PB30_PF_UART2_TXD);
	76	imx_gpio_mode(PB31_PF_UART2_RXD);
	77	#endif
	78
	79	/* Disable UART */
	80	base->ucr1 &= ~UCR1_UARTEN;
	81
	82	/* Set to default POR state */
	83
	84	base->ucr1 = 0x00000004;
	85	base->ucr2 = 0x00000000;
	86	base->ucr3 = 0x00000000;
	87	base->ucr4 = 0x00008040;
	88	base->uesc = 0x0000002B;
	89	base->utim = 0x00000000;
	90	base->ubir = 0x00000000;
	91	base->ubmr = 0x00000000;
	92	base->uts = 0x00000000;
	93	/* Set clocks */
	94	base->ucr4 \|= UCR4_REF16;
	95
	96	/* Configure FIFOs */
	97	base->ufcr = 0xa81;
	98
48fed405 AD	99	/* set the baud rate.
	100	*
	101	* baud * 16 x
	102	* --------- = -
	103	* refclk y
	104	*
	105	* x - 1 = UBIR
	106	* y - 1 = UBMR
	107	*
	108	* each register is 16 bits wide. refclk max is 96 MHz
	109	*
	110	*/
	111
	112	ufcr_rfdiv = ((base->ufcr) & UFCR_RFDIV) >> 7;
	113	if (ufcr_rfdiv == 6)
	114	ufcr_rfdiv = 7;
	115	else
	116	ufcr_rfdiv = 6 - ufcr_rfdiv;
	117
	118	refclk = get_PERCLK1();
	119	refclk /= ufcr_rfdiv;
	120
281e00a3	121	/* Set the numerator value minus one of the BRM ratio */
48fed405	122	base->ubir = (gd->baudrate / 100) - 1;
281e00a3 WD	123
281e00a3 WD	124	/* Set the denominator value minus one of the BRM ratio */
48fed405	125	base->ubmr = (refclk/(16 * 100)) - 1;
281e00a3 WD	126
	127	/* Set to 8N1 */
	128	base->ucr2 &= ~UCR2_PREN;
	129	base->ucr2 \|= UCR2_WS;
	130	base->ucr2 &= ~UCR2_STPB;
	131
	132	/* Ignore RTS */
	133	base->ucr2 \|= UCR2_IRTS;
	134
	135	/* Enable UART */
	136	base->ucr1 \|= UCR1_UARTEN \| UCR1_UARTCLKEN;
	137
	138	/* Enable FIFOs */
	139	base->ucr2 \|= UCR2_SRST \| UCR2_RXEN \| UCR2_TXEN;
	140
53677ef1	141	/* Clear status flags */
281e00a3	142	base->usr2 \|= USR2_ADET \|
48fed405 AD	143	USR2_DTRF \|
	144	USR2_IDLE \|
	145	USR2_IRINT \|
	146	USR2_WAKE \|
	147	USR2_RTSF \|
	148	USR2_BRCD \|
	149	USR2_ORE;
281e00a3	150
53677ef1	151	/* Clear status flags */
281e00a3	152	base->usr1 \|= USR1_PARITYERR \|
48fed405 AD	153	USR1_RTSD \|
	154	USR1_ESCF \|
	155	USR1_FRAMERR \|
	156	USR1_AIRINT \|
	157	USR1_AWAKE;
281e00a3 WD	158	return (0);
	159	}
	160
	161	/*
	162	* Read a single byte from the serial port. Returns 1 on success, 0
	163	* otherwise. When the function is successful, the character read is
	164	* written into its argument c.
	165	*/
	166	int serial_getc (void)
	167	{
	168	volatile struct imx_serial* base = (struct imx_serial *)UART_BASE;
	169	unsigned char ch;
	170
	171	while(base->uts & UTS_RXEMPTY);
	172
	173	ch = (char)base->urxd[0];
	174
	175	return ch;
	176	}
	177
	178	#ifdef CONFIG_HWFLOW
	179	static int hwflow = 0; /* turned off by default */
	180	int hwflow_onoff(int on)
	181	{
	182	}
	183	#endif
	184
	185	/*
	186	* Output a single byte to the serial port.
	187	*/
	188	void serial_putc (const char c)
	189	{
	190	volatile struct imx_serial* base = (struct imx_serial *)UART_BASE;
	191
	192	/* Wait for Tx FIFO not full */
	193	while (base->uts & UTS_TXFULL);
	194
	195	base->utxd[0] = c;
	196
	197	/* If \n, also do \r */
	198	if (c == '\n')
	199	serial_putc ('\r');
	200	}
	201
	202	/*
	203	* Test whether a character is in the RX buffer
	204	*/
	205	int serial_tstc (void)
	206	{
	207	volatile struct imx_serial* base = (struct imx_serial *)UART_BASE;
	208
	209	/* If receive fifo is empty, return false */
	210	if (base->uts & UTS_RXEMPTY)
	211	return 0;
	212	return 1;
	213	}
	214
	215	void
	216	serial_puts (const char *s)
	217	{
	218	while (*s) {
	219	serial_putc (*s++);
	220	}
	221	}