306 lines
9.5 KiB
C
306 lines
9.5 KiB
C
/*-
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* Copyright (c) 2003, 2004 Marcel Moolenaar
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* Copyright (c) 2004 - 2006 Marius Strobl <marius@FreeBSD.org>
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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 a full device
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* path or as an alias is (in the latter case we try to look up the device
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* path via the /aliases node).
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* Only the device paths of devices which are used for TTYs really allow
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* to do this as they look like these (taken from /aliases nodes):
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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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* Additionally, for device paths of SCCs which are connected to a RSC
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* (Remote System Control) device we can hardcode the appropriate channel.
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* Such device paths look like these:
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* rsc: '/pci@1f,4000/ebus@1/se@14,200000:ssp'
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* ttyc: '/pci@1f,4000/ebus@1/se@14,200000:ssp'
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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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const char *p;
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strcpy(alias, dev);
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if ((aliases = OF_finddevice("/aliases")) != -1)
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(void)OF_getprop(aliases, dev, alias, sizeof(alias));
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len = strlen(alias);
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if ((p = rindex(alias, ':')) == NULL)
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return (0);
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p++;
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if (p - alias == len - 1 && (*p == 'a' || *p == 'b'))
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return (*p - 'a' + 1);
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if (strcmp(p, "ssp") == 0)
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return (1);
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return (0);
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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 input
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* and output 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[sizeof("serial")];
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ihandle_t inst;
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phandle_t chosen, input, output;
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if (OF_getprop(options, "input-device", dev, devsz) == -1)
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return (-1);
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input = OF_finddevice(dev);
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if (OF_getprop(options, "output-device", dev, devsz) == -1)
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return (-1);
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output = OF_finddevice(dev);
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if (input == -1 || output == -1 ||
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OF_getproplen(input, "keyboard") >= 0) {
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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", &inst, sizeof(inst)) == -1)
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return (-1);
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if ((input = OF_instance_to_package(inst)) == -1)
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return (-1);
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if (OF_getprop(chosen, "stdout", &inst, sizeof(inst)) == -1)
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return (-1);
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if ((output = OF_instance_to_package(inst)) == -1)
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return (-1);
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snprintf(dev, devsz, "ttya");
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}
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if (input != output)
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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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/* For a Serengeti console device point to the bootbus controller. */
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if (OF_getprop(input, "name", buf, sizeof(buf)) > 0 &&
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!strcmp(buf, "sgcn")) {
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if ((chosen = OF_finddevice("/chosen")) == -1)
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return (-1);
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if (OF_getprop(chosen, "iosram", &input, sizeof(input)) == -1)
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return (-1);
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}
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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(char *dev, size_t devsz)
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{
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char buf[sizeof("serial")];
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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 UART that is selected as the keyboard port,
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* if it's actually used to connect the keyboard according to the OF. I.e.
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* this will return the UART used to connect the keyboard regardless whether
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* it's stdin or not, however not in case the user or the OF gave preference
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* to e.g. a PS/2 keyboard by setting /aliases/keyboard accordingly.
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*/
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static phandle_t
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uart_cpu_getdev_keyboard(char *dev, size_t devsz)
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{
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char buf[sizeof("serial")];
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phandle_t input;
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if ((input = OF_finddevice("keyboard")) == -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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if (OF_getprop(input, "name", dev, devsz) == -1)
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return (-1);
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/*
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* So far this also matched PS/2 keyboard nodes so make sure it's
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* one of the SCCs/UARTs known to be used to connect keyboards.
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*/
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if (strcmp(dev, "su") && strcmp(dev, "su_pnp") && strcmp(dev, "zs"))
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return (-1);
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return (input);
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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], compat[32], dev[64];
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struct uart_class *class;
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phandle_t input, options;
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bus_addr_t addr;
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int baud, bits, error, range, 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(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(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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class = NULL;
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if (!strcmp(buf, "se") || !strcmp(buf, "FJSV,se") ||
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!strcmp(compat, "sab82532")) {
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class = &uart_sab82532_class;
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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 += uart_getrange(class) * (di->bas.chan - 1);
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} else if (!strcmp(buf, "zs")) {
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class = &uart_z8530_class;
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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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range = uart_getrange(class) << di->bas.regshft;
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addr += range - range * (di->bas.chan - 1);
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} else if (!strcmp(buf, "lom-console") || !strcmp(buf, "su") ||
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!strcmp(buf, "su_pnp") || !strcmp(compat, "rsc-console") ||
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!strcmp(compat, "su") || !strcmp(compat, "su16550") ||
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!strcmp(compat, "su16552")) {
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class = &uart_ns8250_class;
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di->bas.chan = 0;
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} else if (!strcmp(compat, "sgsbbc")) {
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class = &uart_sbbc_class;
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di->bas.chan = 0;
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}
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if (class == NULL)
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return (ENXIO);
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/* Fill in the device info. */
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di->ops = uart_getops(class);
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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 if (!strcmp(compat, "rsc-console"))
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di->baudrate = 115200;
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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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OF_getprop(input, "ssp-console-modes", 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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