2 * Copyright (c) 2004 Marcel Moolenaar
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
31 #include <sys/systm.h>
34 #include <machine/bus.h>
35 #include <machine/vmparam.h>
37 #include <dev/uart/uart.h>
38 #include <dev/uart/uart_cpu.h>
51 static struct uart_class *uart_classes[] = {
61 uart_parse_addr(const char **p)
63 return (strtoul(*p, (char**)(uintptr_t)p, 0));
66 static struct uart_class *
67 uart_parse_class(struct uart_class *class, const char **p)
69 struct uart_class *uc;
74 for (i = 0; i < nitems(uart_classes); i++) {
76 nm = uart_getname(uc);
77 if (nm == NULL || *nm == '\0')
80 if (strncmp(nm, *p, len) == 0) {
89 uart_parse_long(const char **p)
91 return (strtol(*p, (char**)(uintptr_t)p, 0));
95 uart_parse_parity(const char **p)
97 if (!strncmp(*p, "even", 4)) {
99 return UART_PARITY_EVEN;
101 if (!strncmp(*p, "mark", 4)) {
103 return UART_PARITY_MARK;
105 if (!strncmp(*p, "none", 4)) {
107 return UART_PARITY_NONE;
109 if (!strncmp(*p, "odd", 3)) {
111 return UART_PARITY_ODD;
113 if (!strncmp(*p, "space", 5)) {
115 return UART_PARITY_SPACE;
121 uart_parse_tag(const char **p)
125 if ((*p)[0] == 'b' && (*p)[1] == 'r') {
129 if ((*p)[0] == 'c' && (*p)[1] == 'h') {
133 if ((*p)[0] == 'd' && (*p)[1] == 'b') {
137 if ((*p)[0] == 'd' && (*p)[1] == 't') {
141 if ((*p)[0] == 'i' && (*p)[1] == 'o') {
145 if ((*p)[0] == 'm' && (*p)[1] == 'm') {
149 if ((*p)[0] == 'p' && (*p)[1] == 'a') {
153 if ((*p)[0] == 'r' && (*p)[1] == 's') {
157 if ((*p)[0] == 's' && (*p)[1] == 'b') {
161 if ((*p)[0] == 'x' && (*p)[1] == 'o') {
176 * Parse a device specification. The specification is a list of attributes
177 * separated by commas. Each attribute is a tag-value pair with the tag and
178 * value separated by a colon. Supported tags are:
184 * io = I/O port address
185 * mm = Memory mapped I/O address
187 * rs = Register shift
189 * xo = Device clock (xtal oscillator)
191 * The io and mm tags are mutually exclusive.
195 uart_getenv(int devtype, struct uart_devinfo *di, struct uart_class *class)
199 bus_addr_t addr = ~0U;
203 * All uart_class references are weak. Make sure the default
204 * device class has been compiled-in.
210 * Check the environment variables "hw.uart.console" and
211 * "hw.uart.dbgport". These variables, when present, specify
212 * which UART port is to be used as serial console or debug
216 case UART_DEV_CONSOLE:
217 cp = kern_getenv("hw.uart.console");
219 case UART_DEV_DBGPORT:
220 cp = kern_getenv("hw.uart.dbgport");
237 di->parity = UART_PARITY_NONE;
239 /* Parse the attributes. */
242 switch (uart_parse_tag(&spec)) {
244 di->baudrate = uart_parse_long(&spec);
247 di->bas.chan = uart_parse_long(&spec);
250 di->databits = uart_parse_long(&spec);
253 class = uart_parse_class(class, &spec);
256 di->bas.bst = uart_bus_space_io;
257 addr = uart_parse_addr(&spec);
260 di->bas.bst = uart_bus_space_mem;
261 addr = uart_parse_addr(&spec);
264 di->parity = uart_parse_parity(&spec);
267 di->bas.regshft = uart_parse_long(&spec);
270 di->stopbits = uart_parse_long(&spec);
273 di->bas.rclk = uart_parse_long(&spec);
290 * If we still have an invalid address, the specification must be
291 * missing an I/O port or memory address. We don't like that.
297 * Accept only the well-known baudrates. Any invalid baudrate
298 * is silently replaced with a 0-valued baudrate. The 0 baudrate
299 * has special meaning. It means that we're not supposed to
300 * program the baudrate and simply communicate with whatever
301 * speed the hardware is currently programmed for.
303 if (di->baudrate >= 19200) {
304 if (di->baudrate % 19200)
306 } else if (di->baudrate >= 1200) {
307 if (di->baudrate % 1200)
309 } else if (di->baudrate > 0) {
310 if (di->baudrate % 75)
315 /* Set the ops and create a bus space handle. */
316 di->ops = uart_getops(class);
317 error = bus_space_map(di->bas.bst, addr, uart_getrange(class), 0,