Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / drivers / serial / altera_jtag_uart.c

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 (file)
index 0000000..0573c7a
--- /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;
+}