1 /*-
2 * Copyright (c) 2016 Michael Zhilin <[email protected]>
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
56 bus_space_tag_t uart_bus_space_io;
57 bus_space_tag_t uart_bus_space_mem;
58
59 static struct uart_class *chipc_uart_class = &uart_ns8250_class;
60
61 #define CHIPC_UART_BAUDRATE 115200
62
63 int
uart_cpu_eqres(struct uart_bas * b1,struct uart_bas * b2)64 uart_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
69 static int
uart_cpu_init(struct uart_devinfo * di,u_int uart,int baudrate)70 uart_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
91 static int
uart_getenv_cfe(int devtype,struct uart_devinfo * di)92 uart_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
128 int
uart_cpu_getdev(int devtype,struct uart_devinfo * di)129 uart_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