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Diffstat (limited to 'drivers/arm/peripherals/pl011/pl011_console.c')
-rw-r--r--drivers/arm/peripherals/pl011/pl011_console.c89
1 files changed, 89 insertions, 0 deletions
diff --git a/drivers/arm/peripherals/pl011/pl011_console.c b/drivers/arm/peripherals/pl011/pl011_console.c
new file mode 100644
index 0000000..1a684ff
--- /dev/null
+++ b/drivers/arm/peripherals/pl011/pl011_console.c
@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * Neither the name of ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <console.h>
+#include <platform.h>
+#include <pl011.h>
+#include <assert.h>
+
+static unsigned long uart_base;
+
+void console_init(unsigned long base_addr)
+{
+ /* TODO: assert() internally calls printf() and will result in
+ * an infinite loop. This needs to be fixed with some kind of
+ * exception mechanism or early panic support. This also applies
+ * to the other assert() calls below.
+ */
+ assert(base_addr);
+
+ /* Initialise internal base address variable */
+ uart_base = base_addr;
+
+ /* Baud Rate */
+#if defined(PL011_INTEGER) && defined(PL011_FRACTIONAL)
+ pl011_write_ibrd(uart_base, PL011_INTEGER);
+ pl011_write_fbrd(uart_base, PL011_FRACTIONAL);
+#else
+ pl011_setbaudrate(uart_base, PL011_BAUDRATE);
+#endif
+
+ pl011_write_lcr_h(uart_base, PL011_LINE_CONTROL);
+
+ /* Clear any pending errors */
+ pl011_write_ecr(uart_base, 0);
+
+ /* Enable tx, rx, and uart overall */
+ pl011_write_cr(uart_base, PL011_UARTCR_RXE | PL011_UARTCR_TXE |
+ PL011_UARTCR_UARTEN);
+
+}
+
+int console_putc(int c)
+{
+ assert(uart_base);
+
+ if (c == '\n')
+ console_putc('\r');
+
+ while ((pl011_read_fr(uart_base) & PL011_UARTFR_TXFF) == 1)
+ ;
+ pl011_write_dr(uart_base, c);
+ return c;
+}
+
+int console_getc(void)
+{
+ assert(uart_base);
+
+ while ((pl011_read_fr(uart_base) & PL011_UARTFR_RXFE) != 0)
+ ;
+ return pl011_read_dr(uart_base);
+}