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author | adrian <adrian@FreeBSD.org> | 2013-03-28 19:27:06 +0000 |
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committer | adrian <adrian@FreeBSD.org> | 2013-03-28 19:27:06 +0000 |
commit | 7eebeb2d9d755fae9127266430445da6c51bbeb3 (patch) | |
tree | bef70a8a1e300bb6e0edd63d3f69531bd6ae6408 /sys/mips/atheros/uart_cpu_ar933x.c | |
parent | 18d941830f6806e7e768f311ca2c8d1498281fd2 (diff) | |
download | FreeBSD-src-7eebeb2d9d755fae9127266430445da6c51bbeb3.zip FreeBSD-src-7eebeb2d9d755fae9127266430445da6c51bbeb3.tar.gz |
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.
Diffstat (limited to 'sys/mips/atheros/uart_cpu_ar933x.c')
-rw-r--r-- | sys/mips/atheros/uart_cpu_ar933x.c | 78 |
1 files changed, 78 insertions, 0 deletions
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); +} |