[thirdparty/u-boot.git] / arch / sparc / cpu / leon3 / serial.c

/* GRLIB APBUART Serial controller driver
 *
 * (C) Copyright 2007
 * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <asm/processor.h>
#include <asm/leon.h>
#include <ambapp.h>
#include <serial.h>
#include <linux/compiler.h>

DECLARE_GLOBAL_DATA_PTR;

ambapp_dev_apbuart *leon3_apbuart = NULL;

static int leon3_serial_init(void)
{
	ambapp_apbdev apbdev;
	unsigned int tmp;

	/* find UART */
	if (ambapp_apb_first(VENDOR_GAISLER, GAISLER_APBUART, &apbdev) == 1) {

		leon3_apbuart = (ambapp_dev_apbuart *) apbdev.address;

		/* found apbuart, let's init...
		 *
		 * Set scaler / baud rate
		 *
		 * Receiver & transmitter enable
		 */
		leon3_apbuart->scaler = CONFIG_SYS_GRLIB_APBUART_SCALER;

		/* Let bit 11 be unchanged (debug bit for GRMON) */
		tmp = READ_WORD(leon3_apbuart->ctrl);

		leon3_apbuart->ctrl = ((tmp & LEON_REG_UART_CTRL_DBG) |
				       LEON_REG_UART_CTRL_RE |
				       LEON_REG_UART_CTRL_TE);

		return 0;
	}
	return -1;		/* didn't find hardware */
}

static void leon3_serial_putc_raw(const char c)
{
	if (!leon3_apbuart)
		return;

	/* Wait for last character to go. */
	while (!(READ_WORD(leon3_apbuart->status) & LEON_REG_UART_STATUS_THE)) ;

	/* Send data */
	leon3_apbuart->data = c;

#ifdef LEON_DEBUG
	/* Wait for data to be sent */
	while (!(READ_WORD(leon3_apbuart->status) & LEON_REG_UART_STATUS_TSE)) ;
#endif
}

static void leon3_serial_putc(const char c)
{
	if (c == '\n')
		leon3_serial_putc_raw('\r');

	leon3_serial_putc_raw(c);
}

static int leon3_serial_getc(void)
{
	if (!leon3_apbuart)
		return 0;

	/* Wait for a character to arrive. */
	while (!(READ_WORD(leon3_apbuart->status) & LEON_REG_UART_STATUS_DR)) ;

	/* read data */
	return READ_WORD(leon3_apbuart->data);
}

static int leon3_serial_tstc(void)
{
	if (leon3_apbuart)
		return (READ_WORD(leon3_apbuart->status) &
			LEON_REG_UART_STATUS_DR);
	return 0;
}

/* set baud rate for uart */
static void leon3_serial_setbrg(void)
{
	/* update baud rate settings, read it from gd->baudrate */
	unsigned int scaler;
	if (leon3_apbuart && (gd->baudrate > 0)) {
		scaler =
		    (((CONFIG_SYS_CLK_FREQ * 10) / (gd->baudrate * 8)) -
		     5) / 10;
		leon3_apbuart->scaler = scaler;
	}
	return;
}

static struct serial_device leon3_serial_drv = {
	.name	= "leon3_serial",
	.start	= leon3_serial_init,
	.stop	= NULL,
	.setbrg	= leon3_serial_setbrg,
	.putc	= leon3_serial_putc,
	.puts	= default_serial_puts,
	.getc	= leon3_serial_getc,
	.tstc	= leon3_serial_tstc,
};

void leon3_serial_initialize(void)
{
	serial_register(&leon3_serial_drv);
}

__weak struct serial_device *default_serial_console(void)
{
	return &leon3_serial_drv;
}
Commit	Line	Data
1e9a164e DH	1	/* GRLIB APBUART Serial controller driver
	2	*
	3	* (C) Copyright 2007
	4	* Daniel Hellstrom, Gaisler Research, daniel@gaisler.com.
	5	*
1a459660	6	* SPDX-License-Identifier: GPL-2.0+
1e9a164e DH	7	*/
	8
	9	#include <common.h>
	10	#include <asm/processor.h>
	11	#include <asm/leon.h>
	12	#include <ambapp.h>
29b5ff7f MV	13	#include <serial.h>
29b5ff7f MV	14	#include <linux/compiler.h>
1e9a164e DH	15
	16	DECLARE_GLOBAL_DATA_PTR;
	17
1e9a164e DH	18	ambapp_dev_apbuart *leon3_apbuart = NULL;
1e9a164e DH	19
29b5ff7f	20	static int leon3_serial_init(void)
1e9a164e DH	21	{
	22	ambapp_apbdev apbdev;
	23	unsigned int tmp;
	24
	25	/* find UART */
	26	if (ambapp_apb_first(VENDOR_GAISLER, GAISLER_APBUART, &apbdev) == 1) {
	27
	28	leon3_apbuart = (ambapp_dev_apbuart *) apbdev.address;
	29
	30	/* found apbuart, let's init...
	31	*
	32	* Set scaler / baud rate
	33	*
	34	* Receiver & transmitter enable
	35	*/
6d0f6bcf	36	leon3_apbuart->scaler = CONFIG_SYS_GRLIB_APBUART_SCALER;
1e9a164e DH	37
	38	/* Let bit 11 be unchanged (debug bit for GRMON) */
	39	tmp = READ_WORD(leon3_apbuart->ctrl);
	40
	41	leon3_apbuart->ctrl = ((tmp & LEON_REG_UART_CTRL_DBG) \|
	42	LEON_REG_UART_CTRL_RE \|
	43	LEON_REG_UART_CTRL_TE);
	44
	45	return 0;
	46	}
	47	return -1; /* didn't find hardware */
	48	}
	49
29b5ff7f	50	static void leon3_serial_putc_raw(const char c)
1e9a164e DH	51	{
	52	if (!leon3_apbuart)
	53	return;
	54
	55	/* Wait for last character to go. */
	56	while (!(READ_WORD(leon3_apbuart->status) & LEON_REG_UART_STATUS_THE)) ;
	57
	58	/* Send data */
	59	leon3_apbuart->data = c;
	60
	61	#ifdef LEON_DEBUG
	62	/* Wait for data to be sent */
	63	while (!(READ_WORD(leon3_apbuart->status) & LEON_REG_UART_STATUS_TSE)) ;
	64	#endif
	65	}
	66
29b5ff7f MV	67	static void leon3_serial_putc(const char c)
	68	{
	69	if (c == '\n')
	70	leon3_serial_putc_raw('\r');
	71
	72	leon3_serial_putc_raw(c);
	73	}
	74
29b5ff7f	75	static int leon3_serial_getc(void)
1e9a164e DH	76	{
	77	if (!leon3_apbuart)
	78	return 0;
	79
	80	/* Wait for a character to arrive. */
	81	while (!(READ_WORD(leon3_apbuart->status) & LEON_REG_UART_STATUS_DR)) ;
	82
	83	/* read data */
	84	return READ_WORD(leon3_apbuart->data);
	85	}
	86
29b5ff7f	87	static int leon3_serial_tstc(void)
1e9a164e DH	88	{
	89	if (leon3_apbuart)
	90	return (READ_WORD(leon3_apbuart->status) &
	91	LEON_REG_UART_STATUS_DR);
	92	return 0;
	93	}
	94
	95	/* set baud rate for uart */
29b5ff7f	96	static void leon3_serial_setbrg(void)
1e9a164e DH	97	{
	98	/* update baud rate settings, read it from gd->baudrate */
	99	unsigned int scaler;
	100	if (leon3_apbuart && (gd->baudrate > 0)) {
	101	scaler =
	102	(((CONFIG_SYS_CLK_FREQ * 10) / (gd->baudrate * 8)) -
	103	5) / 10;
	104	leon3_apbuart->scaler = scaler;
	105	}
	106	return;
	107	}
29b5ff7f	108
29b5ff7f MV	109	static struct serial_device leon3_serial_drv = {
	110	.name = "leon3_serial",
	111	.start = leon3_serial_init,
	112	.stop = NULL,
	113	.setbrg = leon3_serial_setbrg,
	114	.putc = leon3_serial_putc,
ec3fd689	115	.puts = default_serial_puts,
29b5ff7f MV	116	.getc = leon3_serial_getc,
	117	.tstc = leon3_serial_tstc,
	118	};
	119
	120	void leon3_serial_initialize(void)
	121	{
	122	serial_register(&leon3_serial_drv);
	123	}
	124
	125	__weak struct serial_device *default_serial_console(void)
	126	{
	127	return &leon3_serial_drv;
	128	}