2010-03-20 08:03:28 +09:00
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/*
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* (C) Copyright 2004, Psyent Corporation <www.psyent.com>
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* Scott McNutt <smcnutt@psyent.com>
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*
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2013-07-08 16:37:19 +09:00
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* SPDX-License-Identifier: GPL-2.0+
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2010-03-20 08:03:28 +09:00
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*/
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#include <common.h>
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#include <watchdog.h>
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#include <asm/io.h>
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2012-09-13 23:48:50 +09:00
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#include <linux/compiler.h>
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#include <serial.h>
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2010-03-20 08:03:28 +09:00
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2014-08-25 17:50:14 +09:00
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typedef volatile struct {
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unsigned data; /* Data register */
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unsigned control; /* Control register */
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} nios_jtag_t;
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/* data register */
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#define NIOS_JTAG_RVALID (1<<15) /* Read valid */
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#define NIOS_JTAG_DATA(d) ((d)&0x0ff) /* Read data */
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#define NIOS_JTAG_RAVAIL(d) ((d)>>16) /* Read space avail */
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/* control register */
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#define NIOS_JTAG_RE (1 << 0) /* read intr enable */
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#define NIOS_JTAG_WE (1 << 1) /* write intr enable */
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#define NIOS_JTAG_RI (1 << 8) /* read intr pending */
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#define NIOS_JTAG_WI (1 << 9) /* write intr pending*/
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#define NIOS_JTAG_AC (1 << 10) /* activity indicator */
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#define NIOS_JTAG_RRDY (1 << 12) /* read available */
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#define NIOS_JTAG_WSPACE(d) ((d)>>16) /* Write space avail */
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2010-03-20 08:03:28 +09:00
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DECLARE_GLOBAL_DATA_PTR;
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/*------------------------------------------------------------------
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* JTAG acts as the serial port
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*-----------------------------------------------------------------*/
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static nios_jtag_t *jtag = (nios_jtag_t *)CONFIG_SYS_NIOS_CONSOLE;
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2012-09-13 23:48:50 +09:00
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static void altera_jtag_serial_setbrg(void)
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{
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}
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static int altera_jtag_serial_init(void)
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{
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return 0;
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}
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2010-03-20 08:03:28 +09:00
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2012-09-13 23:48:50 +09:00
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static void altera_jtag_serial_putc(char c)
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2010-03-20 08:03:28 +09:00
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{
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2010-03-31 09:30:08 +09:00
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while (1) {
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unsigned st = readl(&jtag->control);
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if (NIOS_JTAG_WSPACE(st))
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break;
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#ifdef CONFIG_ALTERA_JTAG_UART_BYPASS
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if (!(st & NIOS_JTAG_AC)) /* no connection */
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return;
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#endif
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WATCHDOG_RESET();
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}
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2010-03-22 10:24:43 +09:00
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writel ((unsigned char)c, &jtag->data);
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2010-03-20 08:03:28 +09:00
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}
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2012-09-13 23:48:50 +09:00
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static int altera_jtag_serial_tstc(void)
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2010-03-20 08:03:28 +09:00
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{
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return ( readl (&jtag->control) & NIOS_JTAG_RRDY);
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}
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2012-09-13 23:48:50 +09:00
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static int altera_jtag_serial_getc(void)
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2010-03-20 08:03:28 +09:00
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{
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int c;
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unsigned val;
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while (1) {
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WATCHDOG_RESET ();
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val = readl (&jtag->data);
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if (val & NIOS_JTAG_RVALID)
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break;
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}
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c = val & 0x0ff;
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return (c);
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}
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2012-09-13 23:48:50 +09:00
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static struct serial_device altera_jtag_serial_drv = {
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.name = "altera_jtag_uart",
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.start = altera_jtag_serial_init,
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.stop = NULL,
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.setbrg = altera_jtag_serial_setbrg,
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.putc = altera_jtag_serial_putc,
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2012-10-06 23:07:02 +09:00
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.puts = default_serial_puts,
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2012-09-13 23:48:50 +09:00
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.getc = altera_jtag_serial_getc,
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.tstc = altera_jtag_serial_tstc,
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};
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void altera_jtag_serial_initialize(void)
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{
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serial_register(&altera_jtag_serial_drv);
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}
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__weak struct serial_device *default_serial_console(void)
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{
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return &altera_jtag_serial_drv;
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}
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