2 * Copyright (c) 2003, 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>
33 #include <machine/bus.h>
34 #include <machine/bus_private.h>
36 #include <dev/ofw/openfirm.h>
37 #include <machine/ofw_machdep.h>
39 #include <dev/uart/uart.h>
40 #include <dev/uart/uart_cpu.h>
42 bus_space_tag_t uart_bus_space_io;
43 bus_space_tag_t uart_bus_space_mem;
45 static struct bus_space_tag bst_store[3];
48 * Determine which channel of a SCC a device referenced by an alias is.
49 * The information present in the OF device tree only allows to do this
50 * for "ttyX" aliases. If a device is a channel of a SCC its property
51 * in the /aliases node looks like one of these:
52 * ttya: '/central/fhc/zs@0,902000:a'
53 * ttyc: '/pci@1f,0/pci@1,1/ebus@1/se@14,400000:a'
56 uart_cpu_channel(char *dev)
63 if ((aliases = OF_finddevice("/aliases")) != -1)
64 OF_getprop(aliases, dev, alias, sizeof(alias));
66 if (len < 2 || alias[len - 2] != ':' || alias[len - 1] < 'a' ||
69 return (alias[len - 1] - 'a' + 1);
73 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
76 return ((b1->bsh == b2->bsh) ? 1 : 0);
80 * Get the package handle of the UART that is selected as the console, if
81 * the console is an UART of course. Note that we enforce that both stdin
82 * and stdout are selected.
83 * Note that the currently active console (i.e. /chosen/stdout and
84 * /chosen/stdin) may not be the same as the device selected in the
85 * environment (ie /options/output-device and /options/input-device) because
86 * keyboard and screen were selected but the keyboard was unplugged or the
87 * user has changed the environment. In the latter case I would assume that
88 * the user expects that FreeBSD uses the new console setting.
89 * For weirder configurations, use ofw_console(4).
92 uart_cpu_getdev_console(phandle_t options, char *dev, size_t devsz)
95 ihandle_t stdin, stdout;
96 phandle_t chosen, input;
98 if (OF_getprop(options, "input-device", dev, devsz) == -1)
100 if ((input = OF_finddevice(dev)) == -1)
102 if (OF_getprop(options, "output-device", buf, sizeof(buf)) == -1)
104 if (!strcmp(dev, "keyboard") && !strcmp(buf, "screen")) {
105 if ((chosen = OF_finddevice("/chosen")) == -1)
107 if (OF_getprop(chosen, "stdin", &stdin, sizeof(stdin)) == -1)
109 if ((input = OF_instance_to_package(stdin)) == -1)
111 if (OF_getprop(chosen, "stdout", &stdout, sizeof(stdout)) == -1)
113 if (OF_instance_to_package(stdout) != input)
115 snprintf(dev, devsz, "ttya");
116 } else if (OF_finddevice(buf) != input)
118 if (OF_getprop(input, "device_type", buf, sizeof(buf)) == -1)
120 if (strcmp(buf, "serial") != 0)
126 * Get the package handle of the UART that's selected as the debug port.
127 * Since there's no place for this in the OF, we use the kernel environment
128 * variable "hw.uart.dbgport". Note however that the variable is not a
129 * list of attributes. It's single device name or alias, as known by
133 uart_cpu_getdev_dbgport(phandle_t options, char *dev, size_t devsz)
138 if (!getenv_string("hw.uart.dbgport", dev, devsz))
140 if ((input = OF_finddevice(dev)) == -1)
142 if (OF_getprop(input, "device_type", buf, sizeof(buf)) == -1)
144 if (strcmp(buf, "serial") != 0)
150 * Get the package handle of the device that is selected as the keyboard
152 * XXX this also matches PS/2 keyboard controllers and most likely also
156 uart_cpu_getdev_keyboard(phandle_t root, char *dev, size_t devsz)
159 phandle_t child, node;
161 child = OF_child(root);
162 while (child != 0 && child != -1) {
163 if (OF_getprop(child, "device_type", buf, sizeof(buf)) != -1 &&
164 !strcmp(buf, "serial") &&
165 OF_getprop(child, "keyboard", buf, sizeof(buf)) != -1) {
166 OF_getprop(child, "name", dev, devsz);
169 if ((node = uart_cpu_getdev_keyboard(child, dev, devsz)) != -1)
171 child = OF_peer(child);
177 uart_cpu_getdev(int devtype, struct uart_devinfo *di)
179 char buf[32], dev[32], compat[32];
180 phandle_t input, options;
182 int baud, bits, error, space, stop;
185 if ((options = OF_finddevice("/options")) == -1)
188 case UART_DEV_CONSOLE:
189 input = uart_cpu_getdev_console(options, dev, sizeof(dev));
191 case UART_DEV_DBGPORT:
192 input = uart_cpu_getdev_dbgport(options, dev, sizeof(dev));
194 case UART_DEV_KEYBOARD:
195 input = uart_cpu_getdev_keyboard(OF_peer(0), dev, sizeof(dev));
203 error = OF_decode_addr(input, 0, &space, &addr);
207 /* Get the device class. */
208 if (OF_getprop(input, "name", buf, sizeof(buf)) == -1)
210 if (OF_getprop(input, "compatible", compat, sizeof(compat)) == -1)
214 if (!strcmp(buf, "se")) {
215 di->ops = uart_sab82532_ops;
216 /* SAB82532 are only known to be used for TTYs. */
217 if ((di->bas.chan = uart_cpu_channel(dev)) == 0)
219 addr += 64 * (di->bas.chan - 1);
220 } else if (!strcmp(buf, "zs")) {
221 di->ops = uart_z8530_ops;
222 if ((di->bas.chan = uart_cpu_channel(dev)) == 0) {
224 * There's no way to determine from OF which
225 * channel has the keyboard. Should always be
226 * on channel 1 however.
228 if (devtype == UART_DEV_KEYBOARD)
234 addr += 4 - 4 * (di->bas.chan - 1);
235 } else if (!strcmp(buf, "su") || !strcmp(buf, "su_pnp") ||
236 !strcmp(compat, "su") || !strcmp(compat, "su16550")) {
237 di->ops = uart_ns8250_ops;
242 /* Fill in the device info. */
243 di->bas.bst = &bst_store[devtype];
244 di->bas.bsh = sparc64_fake_bustag(space, addr, di->bas.bst);
246 /* Get the line settings. */
247 if (devtype == UART_DEV_KEYBOARD)
253 di->parity = UART_PARITY_NONE;
254 snprintf(buf, sizeof(buf), "%s-mode", dev);
255 if (OF_getprop(options, buf, buf, sizeof(buf)) == -1)
257 if (sscanf(buf, "%d,%d,%c,%d,%c", &baud, &bits, &par, &stop, &flag)
263 di->parity = (par == 'n') ? UART_PARITY_NONE :
264 (par == 'o') ? UART_PARITY_ODD : UART_PARITY_EVEN;