082c434426
a serial console anyway because input-device is set to keyboard and output-device is set to screen but no keyboard is plugged in don't assume that a device node for the input-device alias exists. While this is true for RS232 keyboards (the node of the SCC and UART respectively which controls the keyboard doesn't disappear when no keyboard is plugged in) this assumption breaks for USB keyboards. It's most likely also not true for PS/2 keyboards but OFW doesn't reliably switch to a serial console when the potential keyboard is a PS/2 one which isn't plugged in so this couldn't be verified properly. Reported by: Will Andrews <will@csociety.org>, obrien MFC after: 1 week
269 lines
8.0 KiB
C
269 lines
8.0 KiB
C
/*-
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* Copyright (c) 2003, 2004 Marcel Moolenaar
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <machine/bus.h>
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#include <machine/bus_private.h>
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#include <dev/ofw/openfirm.h>
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#include <machine/ofw_machdep.h>
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#include <dev/uart/uart.h>
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#include <dev/uart/uart_cpu.h>
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bus_space_tag_t uart_bus_space_io;
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bus_space_tag_t uart_bus_space_mem;
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static struct bus_space_tag bst_store[3];
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/*
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* Determine which channel of a SCC a device referenced by an alias is.
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* The information present in the OF device tree only allows to do this
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* for "ttyX" aliases. If a device is a channel of a SCC its property
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* in the /aliases node looks like one of these:
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* ttya: '/central/fhc/zs@0,902000:a'
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* ttyc: '/pci@1f,0/pci@1,1/ebus@1/se@14,400000:a'
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*/
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static int
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uart_cpu_channel(char *dev)
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{
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char alias[64];
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phandle_t aliases;
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int len;
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strcpy(alias, dev);
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if ((aliases = OF_finddevice("/aliases")) != -1)
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OF_getprop(aliases, dev, alias, sizeof(alias));
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len = strlen(alias);
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if (len < 2 || alias[len - 2] != ':' || alias[len - 1] < 'a' ||
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alias[len - 1] > 'b')
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return (0);
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return (alias[len - 1] - 'a' + 1);
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}
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int
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uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
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{
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return ((b1->bsh == b2->bsh) ? 1 : 0);
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}
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/*
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* Get the package handle of the UART that is selected as the console, if
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* the console is an UART of course. Note that we enforce that both stdin
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* and stdout are selected.
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* Note that the currently active console (i.e. /chosen/stdout and
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* /chosen/stdin) may not be the same as the device selected in the
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* environment (ie /options/output-device and /options/input-device) because
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* keyboard and screen were selected but the keyboard was unplugged or the
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* user has changed the environment. In the latter case I would assume that
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* the user expects that FreeBSD uses the new console setting.
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* For weirder configurations, use ofw_console(4).
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*/
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static phandle_t
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uart_cpu_getdev_console(phandle_t options, char *dev, size_t devsz)
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{
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char buf[32];
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ihandle_t stdin, stdout;
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phandle_t chosen, input;
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if (OF_getprop(options, "input-device", dev, devsz) == -1)
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return (-1);
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if (OF_getprop(options, "output-device", buf, sizeof(buf)) == -1)
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return (-1);
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if (!strcmp(dev, "keyboard") && !strcmp(buf, "screen")) {
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if ((chosen = OF_finddevice("/chosen")) == -1)
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return (-1);
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if (OF_getprop(chosen, "stdin", &stdin, sizeof(stdin)) == -1)
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return (-1);
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if ((input = OF_instance_to_package(stdin)) == -1)
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return (-1);
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if (OF_getprop(chosen, "stdout", &stdout, sizeof(stdout)) == -1)
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return (-1);
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if (OF_instance_to_package(stdout) != input)
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return (-1);
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snprintf(dev, devsz, "ttya");
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} else {
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if ((input = OF_finddevice(dev)) == -1)
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return (-1);
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if (OF_finddevice(buf) != input)
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return (-1);
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}
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if (OF_getprop(input, "device_type", buf, sizeof(buf)) == -1)
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return (-1);
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if (strcmp(buf, "serial") != 0)
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return (-1);
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return (input);
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}
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/*
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* Get the package handle of the UART that's selected as the debug port.
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* Since there's no place for this in the OF, we use the kernel environment
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* variable "hw.uart.dbgport". Note however that the variable is not a
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* list of attributes. It's single device name or alias, as known by
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* the OF.
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*/
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static phandle_t
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uart_cpu_getdev_dbgport(phandle_t options, char *dev, size_t devsz)
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{
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char buf[32];
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phandle_t input;
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if (!getenv_string("hw.uart.dbgport", dev, devsz))
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return (-1);
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if ((input = OF_finddevice(dev)) == -1)
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return (-1);
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if (OF_getprop(input, "device_type", buf, sizeof(buf)) == -1)
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return (-1);
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if (strcmp(buf, "serial") != 0)
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return (-1);
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return (input);
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}
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/*
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* Get the package handle of the device that is selected as the keyboard
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* port.
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* XXX this also matches PS/2 keyboard controllers and most likely also
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* USB keyboards.
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*/
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static phandle_t
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uart_cpu_getdev_keyboard(phandle_t root, char *dev, size_t devsz)
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{
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char buf[32];
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phandle_t child, node;
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child = OF_child(root);
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while (child != 0 && child != -1) {
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if (OF_getprop(child, "device_type", buf, sizeof(buf)) != -1 &&
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!strcmp(buf, "serial") &&
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OF_getprop(child, "keyboard", buf, sizeof(buf)) != -1) {
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OF_getprop(child, "name", dev, devsz);
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return (child);
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}
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if ((node = uart_cpu_getdev_keyboard(child, dev, devsz)) != -1)
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return (node);
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child = OF_peer(child);
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}
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return (-1);
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}
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int
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uart_cpu_getdev(int devtype, struct uart_devinfo *di)
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{
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char buf[32], dev[32], compat[32];
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phandle_t input, options;
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bus_addr_t addr;
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int baud, bits, error, space, stop;
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char flag, par;
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if ((options = OF_finddevice("/options")) == -1)
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return (ENXIO);
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switch (devtype) {
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case UART_DEV_CONSOLE:
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input = uart_cpu_getdev_console(options, dev, sizeof(dev));
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break;
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case UART_DEV_DBGPORT:
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input = uart_cpu_getdev_dbgport(options, dev, sizeof(dev));
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break;
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case UART_DEV_KEYBOARD:
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input = uart_cpu_getdev_keyboard(OF_peer(0), dev, sizeof(dev));
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break;
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default:
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input = -1;
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break;
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}
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if (input == -1)
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return (ENXIO);
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error = OF_decode_addr(input, 0, &space, &addr);
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if (error)
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return (error);
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/* Get the device class. */
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if (OF_getprop(input, "name", buf, sizeof(buf)) == -1)
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return (ENXIO);
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if (OF_getprop(input, "compatible", compat, sizeof(compat)) == -1)
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compat[0] = '\0';
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di->bas.regshft = 0;
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di->bas.rclk = 0;
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if (!strcmp(buf, "se")) {
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di->ops = uart_sab82532_ops;
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/* SAB82532 are only known to be used for TTYs. */
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if ((di->bas.chan = uart_cpu_channel(dev)) == 0)
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return (ENXIO);
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addr += 64 * (di->bas.chan - 1);
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} else if (!strcmp(buf, "zs")) {
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di->ops = uart_z8530_ops;
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if ((di->bas.chan = uart_cpu_channel(dev)) == 0) {
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/*
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* There's no way to determine from OF which
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* channel has the keyboard. Should always be
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* on channel 1 however.
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*/
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if (devtype == UART_DEV_KEYBOARD)
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di->bas.chan = 1;
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else
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return (ENXIO);
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}
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di->bas.regshft = 1;
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addr += 4 - 4 * (di->bas.chan - 1);
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} else if (!strcmp(buf, "su") || !strcmp(buf, "su_pnp") ||
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!strcmp(compat, "su") || !strcmp(compat, "su16550")) {
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di->ops = uart_ns8250_ops;
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di->bas.chan = 0;
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} else
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return (ENXIO);
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/* Fill in the device info. */
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di->bas.bst = &bst_store[devtype];
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di->bas.bsh = sparc64_fake_bustag(space, addr, di->bas.bst);
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/* Get the line settings. */
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if (devtype == UART_DEV_KEYBOARD)
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di->baudrate = 1200;
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else
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di->baudrate = 9600;
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di->databits = 8;
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di->stopbits = 1;
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di->parity = UART_PARITY_NONE;
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snprintf(buf, sizeof(buf), "%s-mode", dev);
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if (OF_getprop(options, buf, buf, sizeof(buf)) == -1)
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return (0);
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if (sscanf(buf, "%d,%d,%c,%d,%c", &baud, &bits, &par, &stop, &flag)
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!= 5)
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return (0);
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di->baudrate = baud;
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di->databits = bits;
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di->stopbits = stop;
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di->parity = (par == 'n') ? UART_PARITY_NONE :
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(par == 'o') ? UART_PARITY_ODD : UART_PARITY_EVEN;
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return (0);
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}
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