[thirdparty/u-boot.git] / drivers / serial / serial_xuartlite.c

/*
 * (C) Copyright 2008-2011 Michal Simek <monstr@monstr.eu>
 * Clean driver and add xilinx constant from header file
 *
 * (C) Copyright 2004 Atmark Techno, Inc.
 * Yasushi SHOJI <yashi@atmark-techno.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <config.h>
#include <common.h>
#include <asm/io.h>
#include <linux/compiler.h>
#include <serial.h>

#define SR_TX_FIFO_FULL		0x08 /* transmit FIFO full */
#define SR_RX_FIFO_VALID_DATA	0x01 /* data in receive FIFO */
#define SR_RX_FIFO_FULL		0x02 /* receive FIFO full */

struct uartlite {
	unsigned int rx_fifo;
	unsigned int tx_fifo;
	unsigned int status;
};

static struct uartlite *userial_ports[4] = {
#ifdef XILINX_UARTLITE_BASEADDR
	[0] = (struct uartlite *)XILINX_UARTLITE_BASEADDR,
#endif
#ifdef XILINX_UARTLITE_BASEADDR1
	[1] = (struct uartlite *)XILINX_UARTLITE_BASEADDR1,
#endif
#ifdef XILINX_UARTLITE_BASEADDR2
	[2] = (struct uartlite *)XILINX_UARTLITE_BASEADDR2,
#endif
#ifdef XILINX_UARTLITE_BASEADDR3
	[3] = (struct uartlite *)XILINX_UARTLITE_BASEADDR3
#endif
};

void uartlite_serial_putc(const char c, const int port)
{
	struct uartlite *regs = userial_ports[port];

	if (c == '\n')
		uartlite_serial_putc('\r', port);

	while (in_be32(&regs->status) & SR_TX_FIFO_FULL)
		;
	out_be32(&regs->tx_fifo, c & 0xff);
}

void uartlite_serial_puts(const char *s, const int port)
{
	while (*s)
		uartlite_serial_putc(*s++, port);
}

int uartlite_serial_getc(const int port)
{
	struct uartlite *regs = userial_ports[port];

	while (!(in_be32(&regs->status) & SR_RX_FIFO_VALID_DATA))
		;
	return in_be32(&regs->rx_fifo) & 0xff;
}

int uartlite_serial_tstc(const int port)
{
	struct uartlite *regs = userial_ports[port];

	return in_be32(&regs->status) & SR_RX_FIFO_VALID_DATA;
}

static int uartlite_serial_init(const int port)
{
	if (userial_ports[port])
		return 0;
	return -1;
}

/* Multi serial device functions */
#define DECLARE_ESERIAL_FUNCTIONS(port) \
	int userial##port##_init(void) \
				{ return uartlite_serial_init(port); } \
	void userial##port##_setbrg(void) {} \
	int userial##port##_getc(void) \
				{ return uartlite_serial_getc(port); } \
	int userial##port##_tstc(void) \
				{ return uartlite_serial_tstc(port); } \
	void userial##port##_putc(const char c) \
				{ uartlite_serial_putc(c, port); } \
	void userial##port##_puts(const char *s) \
				{ uartlite_serial_puts(s, port); }

/* Serial device descriptor */
#define INIT_ESERIAL_STRUCTURE(port, __name) {	\
	.name	= __name,			\
	.start	= userial##port##_init,		\
	.stop	= NULL,				\
	.setbrg	= userial##port##_setbrg,	\
	.getc	= userial##port##_getc,		\
	.tstc	= userial##port##_tstc,		\
	.putc	= userial##port##_putc,		\
	.puts	= userial##port##_puts,		\
}

DECLARE_ESERIAL_FUNCTIONS(0);
struct serial_device uartlite_serial0_device =
	INIT_ESERIAL_STRUCTURE(0, "ttyUL0");
DECLARE_ESERIAL_FUNCTIONS(1);
struct serial_device uartlite_serial1_device =
	INIT_ESERIAL_STRUCTURE(1, "ttyUL1");
DECLARE_ESERIAL_FUNCTIONS(2);
struct serial_device uartlite_serial2_device =
	INIT_ESERIAL_STRUCTURE(2, "ttyUL2");
DECLARE_ESERIAL_FUNCTIONS(3);
struct serial_device uartlite_serial3_device =
	INIT_ESERIAL_STRUCTURE(3, "ttyUL3");

__weak struct serial_device *default_serial_console(void)
{
	if (userial_ports[0])
		return &uartlite_serial0_device;
	if (userial_ports[1])
		return &uartlite_serial1_device;
	if (userial_ports[2])
		return &uartlite_serial2_device;
	if (userial_ports[3])
		return &uartlite_serial3_device;

	return NULL;
}

void uartlite_serial_initialize(void)
{
#ifdef XILINX_UARTLITE_BASEADDR
	serial_register(&uartlite_serial0_device);
#endif /* XILINX_UARTLITE_BASEADDR */
#ifdef XILINX_UARTLITE_BASEADDR1
	serial_register(&uartlite_serial1_device);
#endif /* XILINX_UARTLITE_BASEADDR1 */
#ifdef XILINX_UARTLITE_BASEADDR2
	serial_register(&uartlite_serial2_device);
#endif /* XILINX_UARTLITE_BASEADDR2 */
#ifdef XILINX_UARTLITE_BASEADDR3
	serial_register(&uartlite_serial3_device);
#endif /* XILINX_UARTLITE_BASEADDR3 */
}
Commit	Line	Data
507bbe3e	1	/*
49a23e4a	2	* (C) Copyright 2008-2011 Michal Simek <monstr@monstr.eu>
53ea981c	3	* Clean driver and add xilinx constant from header file
507bbe3e	4	*
53ea981c	5	* (C) Copyright 2004 Atmark Techno, Inc.
507bbe3e WD	6	* Yasushi SHOJI <yashi@atmark-techno.com>
507bbe3e WD	7	*
1a459660	8	* SPDX-License-Identifier: GPL-2.0+
507bbe3e WD	9	*/
	10
	11	#include <config.h>
49a23e4a	12	#include <common.h>
53ea981c	13	#include <asm/io.h>
49a23e4a MS	14	#include <linux/compiler.h>
49a23e4a MS	15	#include <serial.h>
507bbe3e	16
53ea981c MS	17	#define SR_TX_FIFO_FULL 0x08 /* transmit FIFO full */
	18	#define SR_RX_FIFO_VALID_DATA 0x01 /* data in receive FIFO */
	19	#define SR_RX_FIFO_FULL 0x02 /* receive FIFO full */
507bbe3e	20
49a23e4a MS	21	struct uartlite {
	22	unsigned int rx_fifo;
	23	unsigned int tx_fifo;
	24	unsigned int status;
	25	};
	26
8cb9b237	27	static struct uartlite *userial_ports[4] = {
49a23e4a MS	28	#ifdef XILINX_UARTLITE_BASEADDR
	29	[0] = (struct uartlite *)XILINX_UARTLITE_BASEADDR,
	30	#endif
	31	#ifdef XILINX_UARTLITE_BASEADDR1
	32	[1] = (struct uartlite *)XILINX_UARTLITE_BASEADDR1,
	33	#endif
	34	#ifdef XILINX_UARTLITE_BASEADDR2
	35	[2] = (struct uartlite *)XILINX_UARTLITE_BASEADDR2,
	36	#endif
	37	#ifdef XILINX_UARTLITE_BASEADDR3
	38	[3] = (struct uartlite *)XILINX_UARTLITE_BASEADDR3
	39	#endif
	40	};
	41
	42	void uartlite_serial_putc(const char c, const int port)
	43	{
	44	struct uartlite *regs = userial_ports[port];
	45
	46	if (c == '\n')
	47	uartlite_serial_putc('\r', port);
	48
	49	while (in_be32(&regs->status) & SR_TX_FIFO_FULL)
	50	;
	51	out_be32(&regs->tx_fifo, c & 0xff);
	52	}
	53
	54	void uartlite_serial_puts(const char *s, const int port)
	55	{
	56	while (*s)
	57	uartlite_serial_putc(*s++, port);
	58	}
	59
	60	int uartlite_serial_getc(const int port)
	61	{
	62	struct uartlite *regs = userial_ports[port];
	63
	64	while (!(in_be32(&regs->status) & SR_RX_FIFO_VALID_DATA))
	65	;
	66	return in_be32(&regs->rx_fifo) & 0xff;
	67	}
	68
	69	int uartlite_serial_tstc(const int port)
	70	{
	71	struct uartlite *regs = userial_ports[port];
507bbe3e	72
49a23e4a MS	73	return in_be32(&regs->status) & SR_RX_FIFO_VALID_DATA;
	74	}
	75
25239e12 MS	76	static int uartlite_serial_init(const int port)
	77	{
	78	if (userial_ports[port])
	79	return 0;
	80	return -1;
	81	}
	82
49a23e4a MS	83	/* Multi serial device functions */
	84	#define DECLARE_ESERIAL_FUNCTIONS(port) \
	85	int userial##port##_init(void) \
25239e12	86	{ return uartlite_serial_init(port); } \
49a23e4a MS	87	void userial##port##_setbrg(void) {} \
	88	int userial##port##_getc(void) \
	89	{ return uartlite_serial_getc(port); } \
	90	int userial##port##_tstc(void) \
	91	{ return uartlite_serial_tstc(port); } \
	92	void userial##port##_putc(const char c) \
	93	{ uartlite_serial_putc(c, port); } \
	94	void userial##port##_puts(const char *s) \
	95	{ uartlite_serial_puts(s, port); }
	96
	97	/* Serial device descriptor */
90bad891 MV	98	#define INIT_ESERIAL_STRUCTURE(port, __name) { \
	99	.name = __name, \
	100	.start = userial##port##_init, \
	101	.stop = NULL, \
	102	.setbrg = userial##port##_setbrg, \
	103	.getc = userial##port##_getc, \
	104	.tstc = userial##port##_tstc, \
	105	.putc = userial##port##_putc, \
	106	.puts = userial##port##_puts, \
	107	}
49a23e4a MS	108
	109	DECLARE_ESERIAL_FUNCTIONS(0);
	110	struct serial_device uartlite_serial0_device =
	111	INIT_ESERIAL_STRUCTURE(0, "ttyUL0");
	112	DECLARE_ESERIAL_FUNCTIONS(1);
	113	struct serial_device uartlite_serial1_device =
	114	INIT_ESERIAL_STRUCTURE(1, "ttyUL1");
	115	DECLARE_ESERIAL_FUNCTIONS(2);
	116	struct serial_device uartlite_serial2_device =
	117	INIT_ESERIAL_STRUCTURE(2, "ttyUL2");
	118	DECLARE_ESERIAL_FUNCTIONS(3);
	119	struct serial_device uartlite_serial3_device =
	120	INIT_ESERIAL_STRUCTURE(3, "ttyUL3");
	121
	122	__weak struct serial_device *default_serial_console(void)
	123	{
25239e12 MS	124	if (userial_ports[0])
	125	return &uartlite_serial0_device;
	126	if (userial_ports[1])
	127	return &uartlite_serial1_device;
	128	if (userial_ports[2])
	129	return &uartlite_serial2_device;
	130	if (userial_ports[3])
	131	return &uartlite_serial3_device;
	132
	133	return NULL;
507bbe3e	134	}
87d69229 MV	135
	136	void uartlite_serial_initialize(void)
	137	{
	138	#ifdef XILINX_UARTLITE_BASEADDR
	139	serial_register(&uartlite_serial0_device);
	140	#endif /* XILINX_UARTLITE_BASEADDR */
	141	#ifdef XILINX_UARTLITE_BASEADDR1
	142	serial_register(&uartlite_serial1_device);
	143	#endif /* XILINX_UARTLITE_BASEADDR1 */
	144	#ifdef XILINX_UARTLITE_BASEADDR2
	145	serial_register(&uartlite_serial2_device);
	146	#endif /* XILINX_UARTLITE_BASEADDR2 */
	147	#ifdef XILINX_UARTLITE_BASEADDR3
	148	serial_register(&uartlite_serial3_device);
	149	#endif /* XILINX_UARTLITE_BASEADDR3 */
	150	}