Add qemu 2.4.0

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

diff --git a/qemu/roms/u-boot/drivers/serial/serial_arc.c b/qemu/roms/u-boot/drivers/serial/serial_arc.c
new file mode 100644 (file)
index 0000000..2ddbf32
--- /dev/null
+++ b/qemu/roms/u-boot/drivers/serial/serial_arc.c
@@ -0,0 +1,115 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <common.h>
+#include <serial.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct arc_serial_regs {
+       unsigned int id0;
+       unsigned int id1;
+       unsigned int id2;
+       unsigned int id3;
+       unsigned int data;
+       unsigned int status;
+       unsigned int baudl;
+       unsigned int baudh;
+};
+
+/* Bit definitions of STATUS register */
+#define UART_RXEMPTY           (1 << 5)
+#define UART_OVERFLOW_ERR      (1 << 1)
+#define UART_TXEMPTY           (1 << 7)
+
+struct arc_serial_regs *regs;
+
+static void arc_serial_setbrg(void)
+{
+       int arc_console_baud;
+
+       if (!gd->baudrate)
+               gd->baudrate = CONFIG_BAUDRATE;
+
+       arc_console_baud = gd->cpu_clk / (gd->baudrate * 4) - 1;
+       writeb(arc_console_baud & 0xff, &regs->baudl);
+
+#ifdef CONFIG_ARC
+       /*
+        * UART ISS(Instruction Set simulator) emulation has a subtle bug:
+        * A existing value of Baudh = 0 is used as a indication to startup
+        * it's internal state machine.
+        * Thus if baudh is set to 0, 2 times, it chokes.
+        * This happens with BAUD=115200 and the formaula above
+        * Until that is fixed, when running on ISS, we will set baudh to !0
+        */
+       if (gd->arch.running_on_hw)
+               writeb((arc_console_baud & 0xff00) >> 8, &regs->baudh);
+       else
+               writeb(1, &regs->baudh);
+#else
+       writeb((arc_console_baud & 0xff00) >> 8, &regs->baudh);
+#endif
+}
+
+static int arc_serial_init(void)
+{
+       regs = (struct arc_serial_regs *)CONFIG_ARC_UART_BASE;
+       serial_setbrg();
+       return 0;
+}
+
+static void arc_serial_putc(const char c)
+{
+       if (c == '\n')
+               arc_serial_putc('\r');
+
+       while (!(readb(&regs->status) & UART_TXEMPTY))
+               ;
+
+       writeb(c, &regs->data);
+}
+
+static int arc_serial_tstc(void)
+{
+       return !(readb(&regs->status) & UART_RXEMPTY);
+}
+
+static int arc_serial_getc(void)
+{
+       while (!arc_serial_tstc())
+               ;
+
+       /* Check for overflow errors */
+       if (readb(&regs->status) & UART_OVERFLOW_ERR)
+               return 0;
+
+       return readb(&regs->data) & 0xFF;
+}
+
+static struct serial_device arc_serial_drv = {
+       .name   = "arc_serial",
+       .start  = arc_serial_init,
+       .stop   = NULL,
+       .setbrg = arc_serial_setbrg,
+       .putc   = arc_serial_putc,
+       .puts   = default_serial_puts,
+       .getc   = arc_serial_getc,
+       .tstc   = arc_serial_tstc,
+};
+
+void arc_serial_initialize(void)
+{
+       serial_register(&arc_serial_drv);
+}
+
+__weak struct serial_device *default_serial_console(void)
+{
+       return &arc_serial_drv;
+}