From c32b1efa43e31bd9a8a7eae3623664d00c34d842 Mon Sep 17 00:00:00 2001
From: Alan Cudmore <alan.cudmore@gmail.com>
Date: Sat, 23 Mar 2013 19:13:07 +0100
Subject: bsp/raspberrypi: New BSP

---
 c/src/lib/libbsp/arm/raspberrypi/console/usart.c | 160 +++++++++++++++++++++++
 1 file changed, 160 insertions(+)
 create mode 100644 c/src/lib/libbsp/arm/raspberrypi/console/usart.c

(limited to 'c/src/lib/libbsp/arm/raspberrypi/console/usart.c')

diff --git a/c/src/lib/libbsp/arm/raspberrypi/console/usart.c b/c/src/lib/libbsp/arm/raspberrypi/console/usart.c
new file mode 100644
index 0000000000..8c64b5fca6
--- /dev/null
+++ b/c/src/lib/libbsp/arm/raspberrypi/console/usart.c
@@ -0,0 +1,160 @@
+/*
+ * Copyright (c) 2013 Alan Cudmore
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *
+ *  http://www.rtems.com/license/LICENSE
+ *
+ */
+
+#include <libchip/sersupp.h>
+
+#include <bsp.h>
+#include <bsp/irq.h>
+#include <bsp/usart.h>
+#include <bsp/raspberrypi.h>
+
+static void usart_delay(uint32_t n)
+{
+   volatile uint32_t i = 0;
+   for(i = 0; i < n; i++);
+}
+
+static rtems_vector_number usart_get_irq_number(const console_tbl *ct)
+{
+   return ct->ulIntVector;
+}
+
+static uint32_t usart_get_baud(const console_tbl *ct)
+{
+   return ct->ulClock;
+}
+
+static void usart_set_baud(int minor, int baud)
+{
+   /*
+   ** Nothing for now
+   */
+   return;
+}
+
+static void usart_initialize(int minor)
+{
+   unsigned int gpio_reg;
+
+   /*
+   ** Program GPIO pins for UART 0
+   */
+   gpio_reg = BCM2835_REG(BCM2835_GPIO_GPFSEL1);
+   gpio_reg &= ~(7<<12);    /* gpio14 */
+   gpio_reg |=  (4<<12);    /* alt0   */
+   gpio_reg &= ~(7<<15);    /* gpio15 */
+   gpio_reg |=  (4<<15);    /* alt0   */
+   BCM2835_REG(BCM2835_GPIO_GPFSEL1) = gpio_reg;
+
+   BCM2835_REG(BCM2835_GPIO_GPPUD) = 0;
+   usart_delay(150);
+   BCM2835_REG(BCM2835_GPIO_GPPUDCLK0) = (1<<14)|(1<<15);
+   usart_delay(150);
+   BCM2835_REG(BCM2835_GPIO_GPPUDCLK0) = 0;
+
+   /*
+   ** Init the PL011 UART
+   */
+   BCM2835_REG(BCM2835_UART0_CR)   = 0;
+   BCM2835_REG(BCM2835_UART0_ICR)  = 0x7FF;
+   BCM2835_REG(BCM2835_UART0_IMSC) = 0;
+   BCM2835_REG(BCM2835_UART0_IBRD) = 1;
+   BCM2835_REG(BCM2835_UART0_FBRD) = 40;
+   BCM2835_REG(BCM2835_UART0_LCRH) = 0x70;
+   BCM2835_REG(BCM2835_UART0_RSRECR) =  0;
+
+   BCM2835_REG(BCM2835_UART0_CR)   = 0x301;
+
+   BCM2835_REG(BCM2835_UART0_IMSC) = BCM2835_UART0_IMSC_RX;
+
+   usart_set_baud(minor, 115000);
+
+}
+
+static int usart_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 usart_last_close(int major, int minor, void *arg)
+{
+  return 0;
+}
+
+static int usart_read_polled(int minor)
+{
+   if (minor == 0)
+   {
+      if(((BCM2835_REG(BCM2835_UART0_FR)) & BCM2835_UART0_FR_RXFE) == 0)
+      {
+         return((BCM2835_REG(BCM2835_UART0_DR)) & 0xFF );
+      }
+      else
+      {
+         return -1;
+      }
+   }
+   else
+   {
+      printk("Unknown console minor number: %d\n", minor);
+      return -1;
+   }
+
+}
+
+static void usart_write_polled(int minor, char c)
+{
+   while (1)
+   {
+      if ((BCM2835_REG(BCM2835_UART0_FR) & BCM2835_UART0_FR_TXFF) == 0) break;
+   }
+   BCM2835_REG(BCM2835_UART0_DR) = c;
+}
+
+static ssize_t usart_write_support_polled(
+  int minor,
+  const char *s,
+  size_t n
+)
+{
+  ssize_t i = 0;
+
+  for (i = 0; i < n; ++i)
+  {
+    usart_write_polled(minor, s [i]);
+  }
+
+  return n;
+}
+
+static int usart_set_attributes(int minor, const struct termios *term)
+{
+  return -1;
+}
+
+const console_fns bcm2835_usart_fns = {
+  .deviceProbe = libchip_serial_default_probe,
+  .deviceFirstOpen = usart_first_open,
+  .deviceLastClose = usart_last_close,
+  .deviceRead = usart_read_polled,
+  .deviceWrite = usart_write_support_polled,
+  .deviceInitialize = usart_initialize,
+  .deviceWritePolled = usart_write_polled,
+  .deviceSetAttributes = usart_set_attributes,
+  .deviceOutputUsesInterrupts = false
+};
-- 
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