From fd5701587f7961259253e66e4dd8fa8c44e8ee91 Mon Sep 17 00:00:00 2001
From: Hesham ALMatary <heshamelmatary@gmail.com>
Date: Wed, 20 Aug 2014 12:23:20 -0500
Subject: Add new (first) OpenRISC BSP called or1ksim.

This BSP is intended to run on or1ksim (the main OpenRISC emulator).
Fixed version according to Joel comments from the mailing list.
---
 c/src/lib/libbsp/or1k/or1ksim/console/uart.c | 144 +++++++++++++++++++++++++++
 1 file changed, 144 insertions(+)
 create mode 100644 c/src/lib/libbsp/or1k/or1ksim/console/uart.c

(limited to 'c/src/lib/libbsp/or1k/or1ksim/console/uart.c')

diff --git a/c/src/lib/libbsp/or1k/or1ksim/console/uart.c b/c/src/lib/libbsp/or1k/or1ksim/console/uart.c
new file mode 100644
index 0000000000..f1cfa0985f
--- /dev/null
+++ b/c/src/lib/libbsp/or1k/or1ksim/console/uart.c
@@ -0,0 +1,144 @@
+/**
+ * @file
+ *
+ * @ingroup or1ksim_uart
+ *
+ * @brief UART support.
+ */
+
+/*
+ * COPYRIGHT (c) 2014 Hesham ALMatary <heshamelmatary@gmail.com>
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE
+ */
+
+#include <libchip/sersupp.h>
+#include <bsp/or1ksim.h>
+#include <bsp.h>
+#include <bsp/irq.h>
+#include <bsp/uart.h>
+#include <rtems/score/isr.h>
+
+static rtems_vector_number uart_get_irq_number(const console_tbl *ct)
+{
+   return ct->ulIntVector;
+}
+
+static uint32_t uart_get_baud(const console_tbl *ct)
+{
+   return ct->ulClock;
+}
+
+static void uart_set_baud(int baud)
+{
+  int divisor = (OR1KSIM_BSP_CLOCK_FREQ) / (16 * baud);
+  OR1KSIM_REG(OR1KSIM_BSP_UART_REG_LINE_CTRL) |=
+    OR1KSIM_BSP_UART_REG_LINE_CTRL_DLAB;
+
+  OR1KSIM_REG(OR1KSIM_BSP_UART_REG_DEV_LATCH_LOW) = divisor & 0xff;
+
+  OR1KSIM_REG(OR1KSIM_BSP_UART_REG_DEV_LATCH_HIGH) =
+    (divisor >> 8) & 0xff;
+
+  OR1KSIM_REG(OR1KSIM_BSP_UART_REG_LINE_CTRL) &=
+    ~(OR1KSIM_BSP_UART_REG_LINE_CTRL_DLAB);
+}
+
+static void uart_initialize(int minor)
+{
+  /* Disable all interrupts */
+  OR1KSIM_REG(OR1KSIM_BSP_UART_REG_INT_ENABLE) = 0x00;
+
+  /* Reset receiver and transmitter */
+   OR1KSIM_REG(OR1KSIM_BSP_UART_REG_FIFO_CTRL) =
+     OR1KSIM_BSP_UART_REG_FIFO_CTRL_ENABLE_FIFO |
+     OR1KSIM_BSP_UART_REG_FIFO_CTRL_CLEAR_RCVR  |
+     OR1KSIM_BSP_UART_REG_FIFO_CTRL_CLEAR_XMIT  |
+     OR1KSIM_BSP_UART_REG_FIFO_CTRL_TRIGGER_14;
+
+  /* Set data pattern configuration */
+  OR1KSIM_REG(OR1KSIM_BSP_UART_REG_LINE_CTRL) =
+    OR1KSIM_BSP_UART_REG_LINE_CTRL_WLEN8 &
+      (OR1KSIM_BSP_UART_REG_LINE_CTRL_STOP |
+       OR1KSIM_BSP_UART_REG_LINE_CTRL_PARITY);
+
+  /* Set baud rate */
+  uart_set_baud(OR1KSIM_UART_DEFAULT_BAUD);
+}
+
+static int uart_first_open(int major, int minor, void *arg)
+{
+  rtems_libio_open_close_args_t *oc = (rtems_libio_open_close_args_t *) arg;
+  struct rtems_termios_tty *tty = (struct rtems_termios_tty *) oc->iop->data1;
+  const console_tbl *ct = Console_Port_Tbl [minor];
+  console_data *cd = &Console_Port_Data [minor];
+
+  cd->termios_data = tty;
+  rtems_termios_set_initial_baud(tty, ct->ulClock);
+
+  return 0;
+}
+
+static int uart_last_close(int major, int minor, void *arg)
+{
+  return 0;
+}
+
+static int uart_read_polled(int minor)
+{
+   return -1;
+}
+
+static void uart_write_polled(int minor, char c)
+{
+  unsigned char lsr;
+  const uint32_t transmit_finished =
+    (OR1KSIM_BSP_UART_REG_LINE_STATUS_TEMT |
+     OR1KSIM_BSP_UART_REG_LINE_STATUS_THRE);
+
+  /* Wait until there is no pending data in the transmitter FIFO (empty) */
+  do {
+      lsr = OR1KSIM_REG(OR1KSIM_BSP_UART_REG_LINE_STATUS);
+  } while (!(lsr & OR1KSIM_BSP_UART_REG_LINE_STATUS_THRE));
+
+  OR1KSIM_REG(OR1KSIM_BSP_UART_REG_TX) = c;
+
+  /* Wait until trasmit data is finished */
+  do {
+      lsr = OR1KSIM_REG(OR1KSIM_BSP_UART_REG_LINE_STATUS);
+  } while ( (lsr & transmit_finished) != transmit_finished );
+}
+
+static ssize_t uart_write_support_polled(
+  int minor,
+  const char *s,
+  size_t n
+)
+{
+  ssize_t i = 0;
+
+  for (i = 0; i < n; ++i){
+    uart_write_polled(minor, s [i]);
+  }
+
+  return n;
+}
+
+static int uart_set_attributes(int minor, const struct termios *term)
+{
+  return -1;
+}
+
+const console_fns or1ksim_uart_fns = {
+  .deviceProbe = libchip_serial_default_probe,
+  .deviceFirstOpen = uart_first_open,
+  .deviceLastClose = uart_last_close,
+  .deviceRead = uart_read_polled,
+  .deviceWrite = uart_write_support_polled,
+  .deviceInitialize = uart_initialize,
+  .deviceWritePolled = uart_write_polled,
+  .deviceSetAttributes = uart_set_attributes,
+  .deviceOutputUsesInterrupts = false
+};
-- 
cgit v1.2.3