From 7eebeb2d9d755fae9127266430445da6c51bbeb3 Mon Sep 17 00:00:00 2001
From: adrian <adrian@FreeBSD.org>
Date: Thu, 28 Mar 2013 19:27:06 +0000
Subject: Bring over the initial, CPU-only UART support for the AR933x SoC.

This implements the kernel glue needed (getc, putc, rxready).

This isn't a 16550 UART, even if the datasheet overview claims so.

The Linux ar933x support was used as a reference, however the uart code
is a reimplementation.

Attentive viewers will note that the uart code is based off of the ns8250
code and the UART bus code is a stubbed-out version of this.  I'll be
replacing it with non-stubbed versions soon, making this a fully featured
driver.

Tested:

* AP121 reference board (AR933x), booting through the mountroot> prompt;
  then doing some basic interactive tests in ddb.
---
 sys/mips/atheros/uart_cpu_ar933x.c | 78 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 sys/mips/atheros/uart_cpu_ar933x.c

(limited to 'sys/mips/atheros/uart_cpu_ar933x.c')

diff --git a/sys/mips/atheros/uart_cpu_ar933x.c b/sys/mips/atheros/uart_cpu_ar933x.c
new file mode 100644
index 0000000..4a24add
--- /dev/null
+++ b/sys/mips/atheros/uart_cpu_ar933x.c
@@ -0,0 +1,78 @@
+/*-
+ * Copyright (c) 2012 Adrian Chadd <adrian@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 "opt_uart.h"
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+
+#include <machine/bus.h>
+
+#include <dev/uart/uart.h>
+#include <dev/uart/uart_cpu.h>
+
+#include <mips/atheros/ar71xxreg.h>
+#include <mips/atheros/ar71xx_cpudef.h>
+#include <mips/atheros/ar71xx_bus_space_reversed.h>
+
+#include <mips/atheros/uart_dev_ar933x.h>
+
+bus_space_tag_t uart_bus_space_io;
+bus_space_tag_t uart_bus_space_mem;
+
+int
+uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
+{
+	return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0);
+}
+
+int
+uart_cpu_getdev(int devtype, struct uart_devinfo *di)
+{
+	uint64_t freq;
+
+	freq = ar71xx_ahb_freq();
+
+	di->ops = uart_getops(&uart_ar933x_class);
+	di->bas.chan = 0;
+	di->bas.bst = ar71xx_bus_space_reversed;
+	di->bas.regshft = 0;	/* We'll do "correct" dword addressing here */
+	di->bas.rclk = freq;
+	di->baudrate = 115200;
+	di->databits = 8;
+	di->stopbits = 1;
+
+	di->parity = UART_PARITY_NONE;
+
+	uart_bus_space_io = NULL;
+	uart_bus_space_mem = ar71xx_bus_space_reversed;
+	di->bas.bsh = MIPS_PHYS_TO_KSEG1(AR71XX_UART_ADDR);
+	return (0);
+}
-- 
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