serial_xuartlite.c
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/*
* (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 */
#define ULITE_CONTROL_RST_TX 0x01
#define ULITE_CONTROL_RST_RX 0x02
struct uartlite {
unsigned int rx_fifo;
unsigned int tx_fifo;
unsigned int status;
unsigned int control;
};
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
};
static 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(®s->status) & SR_TX_FIFO_FULL)
;
out_be32(®s->tx_fifo, c & 0xff);
}
static void uartlite_serial_puts(const char *s, const int port)
{
while (*s)
uartlite_serial_putc(*s++, port);
}
static int uartlite_serial_getc(const int port)
{
struct uartlite *regs = userial_ports[port];
while (!(in_be32(®s->status) & SR_RX_FIFO_VALID_DATA))
;
return in_be32(®s->rx_fifo) & 0xff;
}
static int uartlite_serial_tstc(const int port)
{
struct uartlite *regs = userial_ports[port];
return in_be32(®s->status) & SR_RX_FIFO_VALID_DATA;
}
static int uartlite_serial_init(const int port)
{
struct uartlite *regs = userial_ports[port];
if (regs) {
out_be32(®s->control, 0);
out_be32(®s->control,
ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX);
in_be32(®s->control);
return 0;
}
return -1;
}
/* Multi serial device functions */
#define DECLARE_ESERIAL_FUNCTIONS(port) \
static int userial##port##_init(void) \
{ return uartlite_serial_init(port); } \
static void userial##port##_setbrg(void) {} \
static int userial##port##_getc(void) \
{ return uartlite_serial_getc(port); } \
static int userial##port##_tstc(void) \
{ return uartlite_serial_tstc(port); } \
static void userial##port##_putc(const char c) \
{ uartlite_serial_putc(c, port); } \
static 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 */
}