uart_cpu_xlp.c revision 225394 
1/*-
2 * Copyright 2003-2011 Netlogic Microsystems (Netlogic). All rights
3 * reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in
13 *    the documentation and/or other materials provided with the
14 *    distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY Netlogic Microsystems ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NETLOGIC OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
26 * THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * NETLOGIC_BSD */
29
30/*
31 * Skeleton of this file was based on respective code for ARM
32 * code written by Olivier Houchard.
33 */
34/*
35 * XLRMIPS: This file is hacked from arm/...
36 */
37#include "opt_uart.h"
38
39#include <sys/cdefs.h>
40__FBSDID("$FreeBSD: head/sys/mips/nlm/uart_cpu_xlp.c 225394 2011-09-05 10:45:29Z jchandra $");
41
42#include <sys/param.h>
43#include <sys/systm.h>
44#include <sys/bus.h>
45#include <sys/cons.h>
46#include <sys/kdb.h>
47#include <sys/kernel.h>
48#include <sys/lock.h>
49#include <sys/mutex.h>
50
51#include <machine/bus.h>
52
53#include <dev/uart/uart.h>
54#include <dev/uart/uart_cpu.h>
55
56#include <mips/nlm/hal/haldefs.h>
57#include <mips/nlm/hal/iomap.h>
58#include <mips/nlm/hal/uart.h>
59
60bus_space_tag_t uart_bus_space_io;
61bus_space_tag_t uart_bus_space_mem;
62
63/*
64 * need a special bus space for this, because the Netlogic SoC
65 * UART allows only 32 bit access to its registers
66 */
67static struct bus_space nlm_uart_bussp;
68
69static u_int8_t
70nlm_uart_bussp_read_1(void *tag, bus_space_handle_t handle,
71    bus_size_t offset)
72{
73	return (u_int8_t)(*(volatile u_int32_t *)(handle + offset));
74}
75
76static void
77nlm_uart_bussp_write_1(void *tag, bus_space_handle_t handle,
78    bus_size_t offset, u_int8_t value)
79{
80	*(volatile u_int32_t *)(handle + offset) =  value;
81}
82
83int
84uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
85{
86	return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0);
87}
88
89int
90uart_cpu_getdev(int devtype, struct uart_devinfo *di)
91{
92	/* Create custom bus space */
93	memcpy(&nlm_uart_bussp, rmi_bus_space, sizeof(nlm_uart_bussp));
94	nlm_uart_bussp.bs_r_1 = nlm_uart_bussp_read_1;
95	nlm_uart_bussp.bs_w_1 = nlm_uart_bussp_write_1;
96
97	di->ops = uart_getops(&uart_ns8250_class);
98	di->bas.chan = 0;
99	di->bas.bst = &nlm_uart_bussp;
100	di->bas.bsh = nlm_get_uart_regbase(0, 0);
101
102	di->bas.regshft = 2;
103	/* divisor = rclk / (baudrate * 16); */
104	di->bas.rclk = 133000000;
105	di->baudrate = 115200;
106	di->databits = 8;
107	di->stopbits = 1;
108	di->parity = UART_PARITY_NONE;
109
110	uart_bus_space_io = NULL;
111	uart_bus_space_mem = &nlm_uart_bussp;
112	return (0);
113}
114