* (C) Copyright 2004, Psyent Corporation <www.psyent.com>
* Scott McNutt <smcnutt@psyent.com>
*
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * 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
+ * SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <watchdog.h>
#include <asm/io.h>
-#include <nios2-io.h>
+#include <linux/compiler.h>
+#include <serial.h>
+
+typedef volatile struct {
+ unsigned data; /* Data register */
+ unsigned control; /* Control register */
+} nios_jtag_t;
+
+/* data register */
+#define NIOS_JTAG_RVALID (1<<15) /* Read valid */
+#define NIOS_JTAG_DATA(d) ((d)&0x0ff) /* Read data */
+#define NIOS_JTAG_RAVAIL(d) ((d)>>16) /* Read space avail */
+
+/* control register */
+#define NIOS_JTAG_RE (1 << 0) /* read intr enable */
+#define NIOS_JTAG_WE (1 << 1) /* write intr enable */
+#define NIOS_JTAG_RI (1 << 8) /* read intr pending */
+#define NIOS_JTAG_WI (1 << 9) /* write intr pending*/
+#define NIOS_JTAG_AC (1 << 10) /* activity indicator */
+#define NIOS_JTAG_RRDY (1 << 12) /* read available */
+#define NIOS_JTAG_WSPACE(d) ((d)>>16) /* Write space avail */
DECLARE_GLOBAL_DATA_PTR;
*-----------------------------------------------------------------*/
static nios_jtag_t *jtag = (nios_jtag_t *)CONFIG_SYS_NIOS_CONSOLE;
-void serial_setbrg( void ){ return; }
-int serial_init( void ) { return(0);}
+static void altera_jtag_serial_setbrg(void)
+{
+}
-void serial_putc (char c)
+static int altera_jtag_serial_init(void)
{
- while (NIOS_JTAG_WSPACE ( readl (&jtag->control)) == 0)
- WATCHDOG_RESET ();
- writel ((unsigned char)c, &jtag->data);
+ return 0;
}
-void serial_puts (const char *s)
+static void altera_jtag_serial_putc(char c)
{
- while (*s != 0)
- serial_putc (*s++);
+ while (1) {
+ unsigned st = readl(&jtag->control);
+ if (NIOS_JTAG_WSPACE(st))
+ break;
+#ifdef CONFIG_ALTERA_JTAG_UART_BYPASS
+ if (!(st & NIOS_JTAG_AC)) /* no connection */
+ return;
+#endif
+ WATCHDOG_RESET();
+ }
+ writel ((unsigned char)c, &jtag->data);
}
-int serial_tstc (void)
+static int altera_jtag_serial_tstc(void)
{
return ( readl (&jtag->control) & NIOS_JTAG_RRDY);
}
-int serial_getc (void)
+static int altera_jtag_serial_getc(void)
{
int c;
unsigned val;
c = val & 0x0ff;
return (c);
}
+
+static struct serial_device altera_jtag_serial_drv = {
+ .name = "altera_jtag_uart",
+ .start = altera_jtag_serial_init,
+ .stop = NULL,
+ .setbrg = altera_jtag_serial_setbrg,
+ .putc = altera_jtag_serial_putc,
+ .puts = default_serial_puts,
+ .getc = altera_jtag_serial_getc,
+ .tstc = altera_jtag_serial_tstc,
+};
+
+void altera_jtag_serial_initialize(void)
+{
+ serial_register(&altera_jtag_serial_drv);
+}
+
+__weak struct serial_device *default_serial_console(void)
+{
+ return &altera_jtag_serial_drv;
+}