1
0
mirror of https://git.FreeBSD.org/src.git synced 2024-12-25 11:37:56 +00:00
freebsd/sys/dev/uart/uart_cpu_sparc64.c
Marcel Moolenaar f8100ce2a7 Don't expose the uart_ops structure directly, but instead have
it obtained through the uart_class structure. This allows us
to declare the uart_class structure as weak and as such allows
us to reference it even when it's not compiled-in.
It also allows is to get the uart_ops structure by name, which
makes it possible to implement the dt tag handling in uart_getenv().
The side-effect of all this is that we're using the uart_class
structure more consistently which means that we now also have
access to the size of the bus space block needed by the hardware
when we map the bus space, eliminating any hardcoding.
2007-04-02 22:00:22 +00:00

293 lines
9.1 KiB
C

/*-
* Copyright (c) 2003, 2004 Marcel Moolenaar
* Copyright (c) 2004 - 2006 Marius Strobl <marius@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <machine/bus.h>
#include <machine/bus_private.h>
#include <dev/ofw/openfirm.h>
#include <machine/ofw_machdep.h>
#include <dev/uart/uart.h>
#include <dev/uart/uart_cpu.h>
bus_space_tag_t uart_bus_space_io;
bus_space_tag_t uart_bus_space_mem;
static struct bus_space_tag bst_store[3];
/*
* Determine which channel of a SCC a device referenced by a full device
* path or as an alias is (in the latter case we try to look up the device
* path via the /aliases node).
* Only the device paths of devices which are used for TTYs really allow
* to do this as they look like these (taken from /aliases nodes):
* ttya: '/central/fhc/zs@0,902000:a'
* ttyc: '/pci@1f,0/pci@1,1/ebus@1/se@14,400000:a'
* Additionally, for device paths of SCCs which are connected to a RSC
* (Remote System Control) device we can hardcode the appropriate channel.
* Such device paths look like these:
* rsc: '/pci@1f,4000/ebus@1/se@14,200000:ssp'
* ttyc: '/pci@1f,4000/ebus@1/se@14,200000:ssp'
*/
static int
uart_cpu_channel(char *dev)
{
char alias[64];
phandle_t aliases;
int len;
const char *p;
strcpy(alias, dev);
if ((aliases = OF_finddevice("/aliases")) != -1)
(void)OF_getprop(aliases, dev, alias, sizeof(alias));
len = strlen(alias);
if ((p = rindex(alias, ':')) == NULL)
return (0);
p++;
if (p - alias == len - 1 && (*p == 'a' || *p == 'b'))
return (*p - 'a' + 1);
if (strcmp(p, "ssp") == 0)
return (1);
return (0);
}
int
uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
{
return ((b1->bsh == b2->bsh) ? 1 : 0);
}
/*
* Get the package handle of the UART that is selected as the console, if
* the console is an UART of course. Note that we enforce that both input
* and output are selected.
* Note that the currently active console (i.e. /chosen/stdout and
* /chosen/stdin) may not be the same as the device selected in the
* environment (ie /options/output-device and /options/input-device) because
* keyboard and screen were selected but the keyboard was unplugged or the
* user has changed the environment. In the latter case I would assume that
* the user expects that FreeBSD uses the new console setting.
* For weirder configurations, use ofw_console(4).
*/
static phandle_t
uart_cpu_getdev_console(phandle_t options, char *dev, size_t devsz)
{
char buf[sizeof("serial")];
ihandle_t inst;
phandle_t chosen, input, output;
if (OF_getprop(options, "input-device", dev, devsz) == -1)
return (-1);
input = OF_finddevice(dev);
if (OF_getprop(options, "output-device", dev, devsz) == -1)
return (-1);
output = OF_finddevice(dev);
if (input == -1 || output == -1 ||
OF_getproplen(input, "keyboard") >= 0) {
if ((chosen = OF_finddevice("/chosen")) == -1)
return (-1);
if (OF_getprop(chosen, "stdin", &inst, sizeof(inst)) == -1)
return (-1);
if ((input = OF_instance_to_package(inst)) == -1)
return (-1);
if (OF_getprop(chosen, "stdout", &inst, sizeof(inst)) == -1)
return (-1);
if ((output = OF_instance_to_package(inst)) == -1)
return (-1);
snprintf(dev, devsz, "ttya");
}
if (input != output)
return (-1);
if (OF_getprop(input, "device_type", buf, sizeof(buf)) == -1)
return (-1);
if (strcmp(buf, "serial") != 0)
return (-1);
return (input);
}
/*
* Get the package handle of the UART that's selected as the debug port.
* Since there's no place for this in the OF, we use the kernel environment
* variable "hw.uart.dbgport". Note however that the variable is not a
* list of attributes. It's single device name or alias, as known by
* the OF.
*/
static phandle_t
uart_cpu_getdev_dbgport(char *dev, size_t devsz)
{
char buf[sizeof("serial")];
phandle_t input;
if (!getenv_string("hw.uart.dbgport", dev, devsz))
return (-1);
if ((input = OF_finddevice(dev)) == -1)
return (-1);
if (OF_getprop(input, "device_type", buf, sizeof(buf)) == -1)
return (-1);
if (strcmp(buf, "serial") != 0)
return (-1);
return (input);
}
/*
* Get the package handle of the UART that is selected as the keyboard port,
* if it's actually used to connect the keyboard according to the OF. I.e.
* this will return the UART used to connect the keyboard regardless whether
* it's stdin or not, however not in case the user or the OF gave preference
* to e.g. a PS/2 keyboard by setting /aliases/keyboard accordingly.
*/
static phandle_t
uart_cpu_getdev_keyboard(char *dev, size_t devsz)
{
char buf[sizeof("serial")];
phandle_t input;
if ((input = OF_finddevice("keyboard")) == -1)
return (-1);
if (OF_getprop(input, "device_type", buf, sizeof(buf)) == -1)
return (-1);
if (strcmp(buf, "serial") != 0)
return (-1);
if (OF_getprop(input, "name", dev, devsz) == -1)
return (-1);
/*
* So far this also matched PS/2 keyboard nodes so make sure it's
* one of the SCCs/UARTs known to be used to connect keyboards.
*/
if (strcmp(dev, "su") && strcmp(dev, "su_pnp") && strcmp(dev, "zs"))
return (-1);
return (input);
}
int
uart_cpu_getdev(int devtype, struct uart_devinfo *di)
{
char buf[32], compat[32], dev[64];
struct uart_class *class;
phandle_t input, options;
bus_addr_t addr;
int baud, bits, error, range, space, stop;
char flag, par;
if ((options = OF_finddevice("/options")) == -1)
return (ENXIO);
switch (devtype) {
case UART_DEV_CONSOLE:
input = uart_cpu_getdev_console(options, dev, sizeof(dev));
break;
case UART_DEV_DBGPORT:
input = uart_cpu_getdev_dbgport(dev, sizeof(dev));
break;
case UART_DEV_KEYBOARD:
input = uart_cpu_getdev_keyboard(dev, sizeof(dev));
break;
default:
input = -1;
break;
}
if (input == -1)
return (ENXIO);
error = OF_decode_addr(input, 0, &space, &addr);
if (error)
return (error);
/* Get the device class. */
if (OF_getprop(input, "name", buf, sizeof(buf)) == -1)
return (ENXIO);
if (OF_getprop(input, "compatible", compat, sizeof(compat)) == -1)
compat[0] = '\0';
di->bas.regshft = 0;
di->bas.rclk = 0;
class = NULL;
if (!strcmp(buf, "se") || !strcmp(compat, "sab82532")) {
class = &uart_sab82532_class;
/* SAB82532 are only known to be used for TTYs. */
if ((di->bas.chan = uart_cpu_channel(dev)) == 0)
return (ENXIO);
addr += uart_getrange(class) * (di->bas.chan - 1);
} else if (!strcmp(buf, "zs")) {
class = &uart_z8530_class;
if ((di->bas.chan = uart_cpu_channel(dev)) == 0) {
/*
* There's no way to determine from OF which
* channel has the keyboard. Should always be
* on channel 1 however.
*/
if (devtype == UART_DEV_KEYBOARD)
di->bas.chan = 1;
else
return (ENXIO);
}
di->bas.regshft = 1;
range = uart_getrange(class) << di->bas.regshft;
addr += range - range * (di->bas.chan - 1);
} else if (!strcmp(buf, "lom-console") || !strcmp(buf, "su") ||
!strcmp(buf, "su_pnp") || !strcmp(compat, "rsc-console") ||
!strcmp(compat, "su") || !strcmp(compat, "su16550")) {
class = &uart_ns8250_class;
di->bas.chan = 0;
}
if (class == NULL)
return (ENXIO);
/* Fill in the device info. */
di->ops = uart_getops(class);
di->bas.bst = &bst_store[devtype];
di->bas.bsh = sparc64_fake_bustag(space, addr, di->bas.bst);
/* Get the line settings. */
if (devtype == UART_DEV_KEYBOARD)
di->baudrate = 1200;
else if (!strcmp(compat, "rsc-console"))
di->baudrate = 115200;
else
di->baudrate = 9600;
di->databits = 8;
di->stopbits = 1;
di->parity = UART_PARITY_NONE;
snprintf(buf, sizeof(buf), "%s-mode", dev);
if (OF_getprop(options, buf, buf, sizeof(buf)) == -1 &&
OF_getprop(input, "ssp-console-modes", buf, sizeof(buf)) == -1)
return (0);
if (sscanf(buf, "%d,%d,%c,%d,%c", &baud, &bits, &par, &stop, &flag)
!= 5)
return (0);
di->baudrate = baud;
di->databits = bits;
di->stopbits = stop;
di->parity = (par == 'n') ? UART_PARITY_NONE :
(par == 'o') ? UART_PARITY_ODD : UART_PARITY_EVEN;
return (0);
}