Add qemu 2.4.0

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

diff --git a/qemu/roms/u-boot/drivers/serial/opencores_yanu.c b/qemu/roms/u-boot/drivers/serial/opencores_yanu.c
new file mode 100644 (file)
index 0000000..d4ed60c
--- /dev/null
+++ b/qemu/roms/u-boot/drivers/serial/opencores_yanu.c
@@ -0,0 +1,157 @@
+/*
+ * Copyright 2010, Renato Andreola <renato.andreola@imagos.it>
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <common.h>
+#include <watchdog.h>
+#include <asm/io.h>
+#include <nios2-yanu.h>
+#include <serial.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*-----------------------------------------------------------------*/
+/* YANU Imagos serial port */
+/*-----------------------------------------------------------------*/
+
+static yanu_uart_t *uart = (yanu_uart_t *)CONFIG_SYS_NIOS_CONSOLE;
+
+static void oc_serial_setbrg(void)
+{
+       int n, k;
+       const unsigned max_uns = 0xFFFFFFFF;
+       unsigned best_n, best_m, baud;
+       unsigned baudrate;
+
+#if defined(CONFIG_SYS_NIOS_FIXEDBAUD)
+       /* Everything's already setup for fixed-baud PTF assignment */
+       baudrate = CONFIG_BAUDRATE;
+#else
+       baudrate = gd->baudrate;
+#endif
+       /* compute best N and M couple */
+       best_n = YANU_MAX_PRESCALER_N;
+       for (n = YANU_MAX_PRESCALER_N; n >= 0; n--) {
+               if ((unsigned)CONFIG_SYS_CLK_FREQ / (1 << (n + 4)) >=
+                   baudrate) {
+                       best_n = n;
+                       break;
+               }
+       }
+       for (k = 0;; k++) {
+               if (baudrate <= (max_uns >> (15+n-k)))
+                       break;
+       }
+       best_m =
+           (baudrate * (1 << (15 + n - k))) /
+           ((unsigned)CONFIG_SYS_CLK_FREQ >> k);
+
+       baud = best_m + best_n * YANU_BAUDE;
+       writel(baud, &uart->baud);
+
+       return;
+}
+
+static int oc_serial_init(void)
+{
+       unsigned action,control;
+
+       /* status register cleanup */
+       action =  YANU_ACTION_RRRDY     |
+               YANU_ACTION_RTRDY       |
+               YANU_ACTION_ROE         |
+               YANU_ACTION_RBRK        |
+               YANU_ACTION_RFE         |
+               YANU_ACTION_RPE         |
+           YANU_ACTION_RFE | YANU_ACTION_RFIFO_CLEAR | YANU_ACTION_TFIFO_CLEAR;
+
+       writel(action, &uart->action);
+
+       /*
+        * control register cleanup
+        * no interrupts enabled
+        * one stop bit
+        * hardware flow control disabled
+        * 8 bits
+        */
+       control = (0x7 << YANU_CONTROL_BITS_POS);
+       /* enven parity just to be clean */
+       control |= YANU_CONTROL_PAREVEN;
+       /* we set threshold for fifo */
+       control |= YANU_CONTROL_RDYDLY * YANU_RXFIFO_DLY;
+       control |= YANU_CONTROL_TXTHR *  YANU_TXFIFO_THR;
+
+       writel(control, &uart->control);
+
+       /* to set baud rate */
+       serial_setbrg();
+
+       return (0);
+}
+
+
+/*-----------------------------------------------------------------------
+ * YANU CONSOLE
+ *---------------------------------------------------------------------*/
+static void oc_serial_putc(char c)
+{
+       int tx_chars;
+       unsigned status;
+
+       if (c == '\n')
+               serial_putc ('\r');
+
+       while (1) {
+               status = readl(&uart->status);
+               tx_chars = (status>>YANU_TFIFO_CHARS_POS)
+                       & ((1<<YANU_TFIFO_CHARS_N)-1);
+               if (tx_chars < YANU_TXFIFO_SIZE-1)
+                       break;
+               WATCHDOG_RESET ();
+       }
+
+       writel((unsigned char)c, &uart->data);
+}
+
+static int oc_serial_tstc(void)
+{
+       unsigned status ;
+
+       status = readl(&uart->status);
+       return (((status >> YANU_RFIFO_CHARS_POS) &
+                ((1 << YANU_RFIFO_CHARS_N) - 1)) > 0);
+}
+
+static int oc_serial_getc(void)
+{
+       while (serial_tstc() == 0)
+               WATCHDOG_RESET ();
+
+       /* first we pull the char */
+       writel(YANU_ACTION_RFIFO_PULL, &uart->action);
+
+       return(readl(&uart->data) & YANU_DATA_CHAR_MASK);
+}
+
+static struct serial_device oc_serial_drv = {
+       .name   = "oc_serial",
+       .start  = oc_serial_init,
+       .stop   = NULL,
+       .setbrg = oc_serial_setbrg,
+       .putc   = oc_serial_putc,
+       .puts   = default_serial_puts,
+       .getc   = oc_serial_getc,
+       .tstc   = oc_serial_tstc,
+};
+
+void oc_serial_initialize(void)
+{
+       serial_register(&oc_serial_drv);
+}
+
+__weak struct serial_device *default_serial_console(void)
+{
+       return &oc_serial_drv;
+}