X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=qemu%2Froms%2Fu-boot%2Fdrivers%2Fserial%2Faltera_jtag_uart.c;fp=qemu%2Froms%2Fu-boot%2Fdrivers%2Fserial%2Faltera_jtag_uart.c;h=0573c7a9876460c0035dc54accb195ff0138cef8;hb=e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb;hp=0000000000000000000000000000000000000000;hpb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;p=kvmfornfv.git

diff --git a/qemu/roms/u-boot/drivers/serial/altera_jtag_uart.c b/qemu/roms/u-boot/drivers/serial/altera_jtag_uart.c
new file mode 100644
index 000000000..0573c7a98
--- /dev/null
+++ b/qemu/roms/u-boot/drivers/serial/altera_jtag_uart.c
@@ -0,0 +1,85 @@
+/*
+ * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
+ * Scott McNutt <smcnutt@psyent.com>
+ *
+ * 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>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*------------------------------------------------------------------
+ * JTAG acts as the serial port
+ *-----------------------------------------------------------------*/
+static nios_jtag_t *jtag = (nios_jtag_t *)CONFIG_SYS_NIOS_CONSOLE;
+
+static void altera_jtag_serial_setbrg(void)
+{
+}
+
+static int altera_jtag_serial_init(void)
+{
+	return 0;
+}
+
+static void altera_jtag_serial_putc(char c)
+{
+	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);
+}
+
+static int altera_jtag_serial_tstc(void)
+{
+	return ( readl (&jtag->control) & NIOS_JTAG_RRDY);
+}
+
+static int altera_jtag_serial_getc(void)
+{
+	int c;
+	unsigned val;
+
+	while (1) {
+		WATCHDOG_RESET ();
+		val = readl (&jtag->data);
+		if (val & NIOS_JTAG_RVALID)
+			break;
+	}
+	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;
+}