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Diffstat (limited to 'drivers/arm/peripherals/pl011/pl011.c')
-rw-r--r--drivers/arm/peripherals/pl011/pl011.c82
1 files changed, 82 insertions, 0 deletions
diff --git a/drivers/arm/peripherals/pl011/pl011.c b/drivers/arm/peripherals/pl011/pl011.c
new file mode 100644
index 0000000..2f6f5ea
--- /dev/null
+++ b/drivers/arm/peripherals/pl011/pl011.c
@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2013, ARM Limited. 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>
+
+/*
+ * TODO: Console init functions shoule be in a console.c. This file should
+ * only contain the pl011 accessors.
+ */
+void console_init(void)
+{
+ unsigned int divisor;
+
+ /* Baud Rate */
+
+#if defined(PL011_INTEGER) && defined(PL011_FRACTIONAL)
+ mmio_write_32(PL011_BASE + UARTIBRD, PL011_INTEGER);
+ mmio_write_32(PL011_BASE + UARTFBRD, PL011_FRACTIONAL);
+#else
+ divisor = (PL011_CLK_IN_HZ * 4) / PL011_BAUDRATE;
+ mmio_write_32(PL011_BASE + UARTIBRD, divisor >> 6);
+ mmio_write_32(PL011_BASE + UARTFBRD, divisor & 0x3F);
+#endif
+
+
+ mmio_write_32(PL011_BASE + UARTLCR_H, PL011_LINE_CONTROL);
+
+ /* Clear any pending errors */
+ mmio_write_32(PL011_BASE + UARTECR, 0);
+
+ /* Enable tx, rx, and uart overall */
+ mmio_write_32(PL011_BASE + UARTCR,
+ PL011_UARTCR_RXE | PL011_UARTCR_TXE |
+ PL011_UARTCR_UARTEN);
+}
+
+int console_putc(int c)
+{
+ if (c == '\n') {
+ console_putc('\r');
+ }
+ while ((mmio_read_32(PL011_BASE + UARTFR) & PL011_UARTFR_TXFE)
+ == 0) ;
+ mmio_write_32(PL011_BASE + UARTDR, c);
+ return c;
+}
+
+int console_getc(void)
+{
+ while ((mmio_read_32(PL011_BASE + UARTFR) & PL011_UARTFR_RXFE)
+ != 0) ;
+ return mmio_read_32(PL011_BASE + UARTDR);
+}