1/*-
2 * Copyright (c) 2016 Michael Zhilin <mizhka@gmail.com>
3 *
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
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 the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD$");
30
31#include "opt_uart.h"
32
33#include <sys/param.h>
34#include <sys/systm.h>
35#include <sys/bus.h>
36#include <sys/cons.h>
37#include <sys/lock.h>
38#include <sys/mutex.h>
39
40#include <machine/bus.h>
41
42#include <dev/bhnd/cores/chipc/chipcreg.h>
43
44#include <dev/uart/uart.h>
45#include <dev/uart/uart_bus.h>
46#include <dev/uart/uart_cpu.h>
47
48#ifdef CFE
49#include <dev/cfe/cfe_api.h>
50#include <dev/cfe/cfe_ioctl.h>
51#include <dev/cfe/cfe_error.h>
52#endif
53
54#include "bcm_machdep.h"
55
56bus_space_tag_t uart_bus_space_io;
57bus_space_tag_t uart_bus_space_mem;
58
59static struct uart_class *chipc_uart_class = &uart_ns8250_class;
60
61#define	CHIPC_UART_BAUDRATE	115200
62
63int
64uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
65{
66	return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0);
67}
68
69static int
70uart_cpu_init(struct uart_devinfo *di, u_int uart, int baudrate)
71{
72	if (uart >= CHIPC_UART_MAX)
73		return (EINVAL);
74
75	di->ops = uart_getops(chipc_uart_class);
76	di->bas.chan = 0;
77	di->bas.bst = uart_bus_space_mem;
78	di->bas.bsh = (bus_space_handle_t) BCM_CORE_ADDR(bcm_get_platform(),
79	    cc_addr, CHIPC_UART(uart));
80	di->bas.regshft = 0;
81	di->bas.rclk = bcm_get_uart_rclk(bcm_get_platform());
82	di->baudrate = baudrate;
83	di->databits = 8;
84	di->stopbits = 1;
85	di->parity = UART_PARITY_NONE;
86
87	return (0);
88}
89
90#ifdef CFE
91static int
92uart_getenv_cfe(int devtype, struct uart_devinfo *di)
93{
94	char	device[sizeof("uartXX")];
95	int	baud, fd, len;
96	int	ret;
97	u_int	uart;
98
99	/* CFE only vends console configuration */
100	if (devtype != UART_DEV_CONSOLE)
101		return (ENODEV);
102
103	/* Fetch console device */
104	ret = cfe_getenv("BOOT_CONSOLE", device, sizeof(device));
105	if (ret != CFE_OK)
106		return (ENXIO);
107
108	/* Parse serial console unit. Fails on non-uart devices.  */
109	if (sscanf(device, "uart%u", &uart) != 1)
110		return (ENXIO);
111
112	/* Fetch device handle */
113	fd = bcm_get_platform()->cfe_console;
114	if (fd < 0)
115		return (ENXIO);
116
117	/* Fetch serial configuration */
118	ret = cfe_ioctl(fd, IOCTL_SERIAL_GETSPEED, (unsigned char *)&baud,
119	    sizeof(baud), &len, 0);
120	if (ret != CFE_OK)
121		baud = CHIPC_UART_BAUDRATE;
122
123	/* Initialize device info */
124	return (uart_cpu_init(di, uart, baud));
125}
126#endif /* CFE */
127
128int
129uart_cpu_getdev(int devtype, struct uart_devinfo *di)
130{
131	int			 ivar;
132
133	uart_bus_space_io = NULL;
134	uart_bus_space_mem = mips_bus_space_generic;
135
136#ifdef CFE
137	/* Check the CFE environment */
138	if (uart_getenv_cfe(devtype, di) == 0)
139		return (0);
140#endif /* CFE */
141
142	/* Check the kernel environment. */
143	if (uart_getenv(devtype, di, chipc_uart_class) == 0)
144		return (0);
145
146	/* Scan the device hints for the first matching device */
147	for (u_int i = 0; i < CHIPC_UART_MAX; i++) {
148		if (resource_int_value("uart", i, "flags", &ivar))
149			continue;
150
151		/* Check usability */
152		if (devtype == UART_DEV_CONSOLE && !UART_FLAGS_CONSOLE(ivar))
153			continue;
154
155		if (devtype == UART_DEV_DBGPORT && !UART_FLAGS_DBGPORT(ivar))
156			continue;
157
158		if (resource_int_value("uart", i, "disabled", &ivar) == 0 &&
159		    ivar == 0)
160			continue;
161
162		/* Found */
163		if (resource_int_value("uart", i, "baud", &ivar) != 0)
164			ivar = CHIPC_UART_BAUDRATE;
165
166		return (uart_cpu_init(di, i, ivar));
167	}
168
169	/* Default to uart0/115200 */
170	return (uart_cpu_init(di, 0, CHIPC_UART_BAUDRATE));
171}
172