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freebsd-dev/sys/powerpc/ofw/ofw_real.c
Rafal Jaworowski 8297758a22 Prepare and extend OFW layer for FDT support. 
o Let OFW_INIT() and OF_init() return status value.

o Provide helper routines for 'compatible' property handling.

o Only compile OF and OFW code, which is relevant in FDT scenario.

o Other minor cosmetics

Reviewed by:	imp
Sponsored by:	The FreeBSD Foundation
2010-05-28 10:43:56 +00:00

930 lines
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/* $NetBSD: Locore.c,v 1.7 2000/08/20 07:04:59 tsubai Exp $ */
/*-
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
* Copyright (C) 1995, 1996 TooLs GmbH.
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by TooLs GmbH.
* 4. The name of TooLs GmbH may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
*/
/*-
* Copyright (C) 2000 Benno Rice.
* 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 Benno Rice ``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 TOOLS GMBH 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/kernel.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/systm.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <machine/stdarg.h>
#include <machine/bus.h>
#include <machine/pmap.h>
#include <machine/ofw_machdep.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofwvar.h>
#include "ofw_if.h"
static int ofw_real_init(ofw_t, void *openfirm);
static int ofw_real_test(ofw_t, const char *name);
static phandle_t ofw_real_peer(ofw_t, phandle_t node);
static phandle_t ofw_real_child(ofw_t, phandle_t node);
static phandle_t ofw_real_parent(ofw_t, phandle_t node);
static phandle_t ofw_real_instance_to_package(ofw_t, ihandle_t instance);
static ssize_t ofw_real_getproplen(ofw_t, phandle_t package,
const char *propname);
static ssize_t ofw_real_getprop(ofw_t, phandle_t package, const char *propname,
void *buf, size_t buflen);
static int ofw_real_nextprop(ofw_t, phandle_t package, const char *previous,
char *buf, size_t);
static int ofw_real_setprop(ofw_t, phandle_t package, const char *propname,
const void *buf, size_t len);
static ssize_t ofw_real_canon(ofw_t, const char *device, char *buf, size_t len);
static phandle_t ofw_real_finddevice(ofw_t, const char *device);
static ssize_t ofw_real_instance_to_path(ofw_t, ihandle_t instance, char *buf,
size_t len);
static ssize_t ofw_real_package_to_path(ofw_t, phandle_t package, char *buf,
size_t len);
static int ofw_real_call_method(ofw_t, ihandle_t instance, const char *method,
int nargs, int nreturns, unsigned long *args_and_returns);
static ihandle_t ofw_real_open(ofw_t, const char *device);
static void ofw_real_close(ofw_t, ihandle_t instance);
static ssize_t ofw_real_read(ofw_t, ihandle_t instance, void *addr, size_t len);
static ssize_t ofw_real_write(ofw_t, ihandle_t instance, const void *addr,
size_t len);
static int ofw_real_seek(ofw_t, ihandle_t instance, u_int64_t pos);
static caddr_t ofw_real_claim(ofw_t, void *virt, size_t size, u_int align);
static void ofw_real_release(ofw_t, void *virt, size_t size);
static void ofw_real_enter(ofw_t);
static void ofw_real_exit(ofw_t);
static ofw_method_t ofw_real_methods[] = {
OFWMETHOD(ofw_init, ofw_real_init),
OFWMETHOD(ofw_peer, ofw_real_peer),
OFWMETHOD(ofw_child, ofw_real_child),
OFWMETHOD(ofw_parent, ofw_real_parent),
OFWMETHOD(ofw_instance_to_package, ofw_real_instance_to_package),
OFWMETHOD(ofw_getproplen, ofw_real_getproplen),
OFWMETHOD(ofw_getprop, ofw_real_getprop),
OFWMETHOD(ofw_nextprop, ofw_real_nextprop),
OFWMETHOD(ofw_setprop, ofw_real_setprop),
OFWMETHOD(ofw_canon, ofw_real_canon),
OFWMETHOD(ofw_finddevice, ofw_real_finddevice),
OFWMETHOD(ofw_instance_to_path, ofw_real_instance_to_path),
OFWMETHOD(ofw_package_to_path, ofw_real_package_to_path),
OFWMETHOD(ofw_test, ofw_real_test),
OFWMETHOD(ofw_call_method, ofw_real_call_method),
OFWMETHOD(ofw_open, ofw_real_open),
OFWMETHOD(ofw_close, ofw_real_close),
OFWMETHOD(ofw_read, ofw_real_read),
OFWMETHOD(ofw_write, ofw_real_write),
OFWMETHOD(ofw_seek, ofw_real_seek),
OFWMETHOD(ofw_claim, ofw_real_claim),
OFWMETHOD(ofw_release, ofw_real_release),
OFWMETHOD(ofw_enter, ofw_real_enter),
OFWMETHOD(ofw_exit, ofw_real_exit),
{ 0, 0 }
};
static ofw_def_t ofw_real = {
OFW_STD_REAL,
ofw_real_methods,
0
};
OFW_DEF(ofw_real);
MALLOC_DEFINE(M_OFWREAL, "ofwreal", "Open Firmware Real Mode Bounce Page");
static int (*openfirmware)(void *);
static vm_offset_t of_bounce_phys;
static caddr_t of_bounce_virt;
static off_t of_bounce_offset;
static size_t of_bounce_size;
static struct mtx of_bounce_mtx;
/*
* After the VM is up, allocate a wired, low memory bounce page.
*/
static void ofw_real_bounce_alloc(void *);
SYSINIT(ofw_real_bounce_alloc, SI_SUB_VM, SI_ORDER_ANY,
ofw_real_bounce_alloc, NULL);
static void
ofw_real_start(void)
{
mtx_lock(&of_bounce_mtx);
of_bounce_offset = 0;
}
static void
ofw_real_stop(void)
{
mtx_unlock(&of_bounce_mtx);
}
static void
ofw_real_bounce_alloc(void *junk)
{
/*
* Check that ofw_real is actually in use before allocating wads
* of memory. Do this by checking if our mutex has been set up.
*/
if (!mtx_initialized(&of_bounce_mtx))
return;
/*
* Allocate a page of contiguous, wired physical memory that can
* fit into a 32-bit address space.
*/
mtx_lock(&of_bounce_mtx);
of_bounce_virt = contigmalloc(PAGE_SIZE, M_OFWREAL, 0,
0, BUS_SPACE_MAXADDR_32BIT, PAGE_SIZE, PAGE_SIZE);
of_bounce_phys = vtophys(of_bounce_virt);
of_bounce_size = PAGE_SIZE;
mtx_unlock(&of_bounce_mtx);
}
static cell_t
ofw_real_map(const void *buf, size_t len)
{
cell_t phys;
mtx_assert(&of_bounce_mtx, MA_OWNED);
if (of_bounce_virt == NULL) {
if (!pmap_bootstrapped)
return (cell_t)buf;
/*
* XXX: It is possible for us to get called before the VM has
* come online, but after the MMU is up. We don't have the
* bounce buffer yet, but can no longer presume a 1:1 mapping.
* Grab the physical address of the buffer, and hope it is
* in range if this happens.
*/
return (cell_t)vtophys(buf);
}
/*
* Make sure the bounce page offset satisfies any reasonable
* alignment constraint.
*/
of_bounce_offset += of_bounce_offset % sizeof(register_t);
if (of_bounce_offset + len > of_bounce_size) {
panic("Oversize Open Firmware call!");
return 0;
}
memcpy(of_bounce_virt + of_bounce_offset, buf, len);
phys = of_bounce_phys + of_bounce_offset;
of_bounce_offset += len;
return phys;
}
static void
ofw_real_unmap(cell_t physaddr, void *buf, size_t len)
{
mtx_assert(&of_bounce_mtx, MA_OWNED);
if (of_bounce_virt == NULL)
return;
memcpy(buf,of_bounce_virt + (physaddr - of_bounce_phys),len);
}
/* Initialiser */
static int
ofw_real_init(ofw_t ofw, void *openfirm)
{
openfirmware = (int (*)(void *))openfirm;
mtx_init(&of_bounce_mtx, "OF Bounce Page", MTX_DEF, 0);
of_bounce_virt = NULL;
return (0);
}
/*
* Generic functions
*/
/* Test to see if a service exists. */
static int
ofw_real_test(ofw_t ofw, const char *name)
{
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t service;
cell_t missing;
} args = {
(cell_t)"test",
1,
1,
};
ofw_real_start();
args.service = ofw_real_map(name, strlen(name) + 1);
if (args.service == 0 || openfirmware(&args) == -1) {
ofw_real_stop();
return (-1);
}
ofw_real_stop();
return (args.missing);
}
/*
* Device tree functions
*/
/* Return the next sibling of this node or 0. */
static phandle_t
ofw_real_peer(ofw_t ofw, phandle_t node)
{
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t node;
cell_t next;
} args = {
(cell_t)"peer",
1,
1,
};
args.node = node;
if (openfirmware(&args) == -1)
return (-1);
return (args.next);
}
/* Return the first child of this node or 0. */
static phandle_t
ofw_real_child(ofw_t ofw, phandle_t node)
{
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t node;
cell_t child;
} args = {
(cell_t)"child",
1,
1,
};
args.node = node;
if (openfirmware(&args) == -1)
return (-1);
return (args.child);
}
/* Return the parent of this node or 0. */
static phandle_t
ofw_real_parent(ofw_t ofw, phandle_t node)
{
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t node;
cell_t parent;
} args = {
(cell_t)"parent",
1,
1,
};
args.node = node;
if (openfirmware(&args) == -1)
return (-1);
return (args.parent);
}
/* Return the package handle that corresponds to an instance handle. */
static phandle_t
ofw_real_instance_to_package(ofw_t ofw, ihandle_t instance)
{
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t instance;
cell_t package;
} args = {
(cell_t)"instance-to-package",
1,
1,
};
args.instance = instance;
if (openfirmware(&args) == -1)
return (-1);
return (args.package);
}
/* Get the length of a property of a package. */
static ssize_t
ofw_real_getproplen(ofw_t ofw, phandle_t package, const char *propname)
{
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t package;
cell_t propname;
cell_t proplen;
} args = {
(cell_t)"getproplen",
2,
1,
};
ofw_real_start();
args.package = package;
args.propname = ofw_real_map(propname, strlen(propname) + 1);
if (args.propname == 0 || openfirmware(&args) == -1) {
ofw_real_stop();
return (-1);
}
ofw_real_stop();
return (args.proplen);
}
/* Get the value of a property of a package. */
static ssize_t
ofw_real_getprop(ofw_t ofw, phandle_t package, const char *propname, void *buf,
size_t buflen)
{
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t package;
cell_t propname;
cell_t buf;
cell_t buflen;
cell_t size;
} args = {
(cell_t)"getprop",
4,
1,
};
ofw_real_start();
args.package = package;
args.propname = ofw_real_map(propname, strlen(propname) + 1);
args.buf = ofw_real_map(buf, buflen);
args.buflen = buflen;
if (args.propname == 0 || args.buf == 0 || openfirmware(&args) == -1) {
ofw_real_stop();
return (-1);
}
ofw_real_unmap(args.buf, buf, buflen);
ofw_real_stop();
return (args.size);
}
/* Get the next property of a package. */
static int
ofw_real_nextprop(ofw_t ofw, phandle_t package, const char *previous,
char *buf, size_t size)
{
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t package;
cell_t previous;
cell_t buf;
cell_t flag;
} args = {
(cell_t)"nextprop",
3,
1,
};
ofw_real_start();
args.package = package;
args.previous = ofw_real_map(previous, strlen(previous) + 1);
args.buf = ofw_real_map(buf, size);
if (args.previous == 0 || args.buf == 0 || openfirmware(&args) == -1) {
ofw_real_stop();
return (-1);
}
ofw_real_unmap(args.buf, buf, size);
ofw_real_stop();
return (args.flag);
}
/* Set the value of a property of a package. */
/* XXX Has a bug on FirePower */
static int
ofw_real_setprop(ofw_t ofw, phandle_t package, const char *propname,
const void *buf, size_t len)
{
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t package;
cell_t propname;
cell_t buf;
cell_t len;
cell_t size;
} args = {
(cell_t)"setprop",
4,
1,
};
ofw_real_start();
args.package = package;
args.propname = ofw_real_map(propname, strlen(propname) + 1);
args.buf = ofw_real_map(buf, len);
args.len = len;
if (args.propname == 0 || args.buf == 0 || openfirmware(&args) == -1) {
ofw_real_stop();
return (-1);
}
ofw_real_stop();
return (args.size);
}
/* Convert a device specifier to a fully qualified pathname. */
static ssize_t
ofw_real_canon(ofw_t ofw, const char *device, char *buf, size_t len)
{
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t device;
cell_t buf;
cell_t len;
cell_t size;
} args = {
(cell_t)"canon",
3,
1,
};
ofw_real_start();
args.device = ofw_real_map(device, strlen(device) + 1);
args.buf = ofw_real_map(buf, len);
args.len = len;
if (args.device == 0 || args.buf == 0 || openfirmware(&args) == -1) {
ofw_real_stop();
return (-1);
}
ofw_real_unmap(args.buf, buf, len);
ofw_real_stop();
return (args.size);
}
/* Return a package handle for the specified device. */
static phandle_t
ofw_real_finddevice(ofw_t ofw, const char *device)
{
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t device;
cell_t package;
} args = {
(cell_t)"finddevice",
1,
1,
};
ofw_real_start();
args.device = ofw_real_map(device, strlen(device) + 1);
if (args.device == 0 || openfirmware(&args) == -1) {
ofw_real_stop();
return (-1);
}
ofw_real_stop();
return (args.package);
}
/* Return the fully qualified pathname corresponding to an instance. */
static ssize_t
ofw_real_instance_to_path(ofw_t ofw, ihandle_t instance, char *buf, size_t len)
{
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t instance;
cell_t buf;
cell_t len;
cell_t size;
} args = {
(cell_t)"instance-to-path",
3,
1,
};
ofw_real_start();
args.instance = instance;
args.buf = ofw_real_map(buf, len);
args.len = len;
if (args.buf == 0 || openfirmware(&args) == -1) {
ofw_real_stop();
return (-1);
}
ofw_real_unmap(args.buf, buf, len);
ofw_real_stop();
return (args.size);
}
/* Return the fully qualified pathname corresponding to a package. */
static ssize_t
ofw_real_package_to_path(ofw_t ofw, phandle_t package, char *buf, size_t len)
{
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t package;
cell_t buf;
cell_t len;
cell_t size;
} args = {
(cell_t)"package-to-path",
3,
1,
};
ofw_real_start();
args.package = package;
args.buf = ofw_real_map(buf, len);
args.len = len;
if (args.buf == 0 || openfirmware(&args) == -1) {
ofw_real_stop();
return (-1);
}
ofw_real_unmap(args.buf, buf, len);
ofw_real_stop();
return (args.size);
}
/* Call the method in the scope of a given instance. */
static int
ofw_real_call_method(ofw_t ofw, ihandle_t instance, const char *method,
int nargs, int nreturns, unsigned long *args_and_returns)
{
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t method;
cell_t instance;
cell_t args_n_results[12];
} args = {
(cell_t)"call-method",
2,
1,
};
cell_t *cp;
unsigned long *ap;
int n;
if (nargs > 6)
return (-1);
ofw_real_start();
args.nargs = nargs + 2;
args.nreturns = nreturns + 1;
args.method = ofw_real_map(method, strlen(method) + 1);
args.instance = instance;
ap = args_and_returns;
for (cp = args.args_n_results + (n = nargs); --n >= 0;)
*--cp = *(ap++);
if (args.method == 0 || openfirmware(&args) == -1) {
ofw_real_stop();
return (-1);
}
ofw_real_stop();
if (args.args_n_results[nargs])
return (args.args_n_results[nargs]);
for (cp = args.args_n_results + nargs + (n = args.nreturns); --n > 0;)
*(ap++) = *--cp;
return (0);
}
/*
* Device I/O functions
*/
/* Open an instance for a device. */
static ihandle_t
ofw_real_open(ofw_t ofw, const char *device)
{
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t device;
cell_t instance;
} args = {
(cell_t)"open",
1,
1,
};
ofw_real_start();
args.device = ofw_real_map(device, strlen(device) + 1);
if (args.device == 0 || openfirmware(&args) == -1
|| args.instance == 0) {
ofw_real_stop();
return (-1);
}
ofw_real_stop();
return (args.instance);
}
/* Close an instance. */
static void
ofw_real_close(ofw_t ofw, ihandle_t instance)
{
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t instance;
} args = {
(cell_t)"close",
1,
0,
};
args.instance = instance;
openfirmware(&args);
}
/* Read from an instance. */
static ssize_t
ofw_real_read(ofw_t ofw, ihandle_t instance, void *addr, size_t len)
{
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t instance;
cell_t addr;
cell_t len;
cell_t actual;
} args = {
(cell_t)"read",
3,
1,
};
ofw_real_start();
args.instance = instance;
args.addr = ofw_real_map(addr, len);
args.len = len;
if (args.addr == 0 || openfirmware(&args) == -1) {
ofw_real_stop();
return (-1);
}
ofw_real_unmap(args.addr, addr, len);
ofw_real_stop();
return (args.actual);
}
/* Write to an instance. */
static ssize_t
ofw_real_write(ofw_t ofw, ihandle_t instance, const void *addr, size_t len)
{
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t instance;
cell_t addr;
cell_t len;
cell_t actual;
} args = {
(cell_t)"write",
3,
1,
};
ofw_real_start();
args.instance = instance;
args.addr = ofw_real_map(addr, len);
args.len = len;
if (args.addr == 0 || openfirmware(&args) == -1) {
ofw_real_stop();
return (-1);
}
ofw_real_stop();
return (args.actual);
}
/* Seek to a position. */
static int
ofw_real_seek(ofw_t ofw, ihandle_t instance, u_int64_t pos)
{
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t instance;
cell_t poshi;
cell_t poslo;
cell_t status;
} args = {
(cell_t)"seek",
3,
1,
};
args.instance = instance;
args.poshi = pos >> 32;
args.poslo = pos;
if (openfirmware(&args) == -1)
return (-1);
return (args.status);
}
/*
* Memory functions
*/
/* Claim an area of memory. */
static caddr_t
ofw_real_claim(ofw_t ofw, void *virt, size_t size, u_int align)
{
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t virt;
cell_t size;
cell_t align;
cell_t baseaddr;
} args = {
(cell_t)"claim",
3,
1,
};
args.virt = (cell_t)virt;
args.size = size;
args.align = align;
if (openfirmware(&args) == -1)
return ((void *)-1);
return ((void *)args.baseaddr);
}
/* Release an area of memory. */
static void
ofw_real_release(ofw_t ofw, void *virt, size_t size)
{
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
cell_t virt;
cell_t size;
} args = {
(cell_t)"release",
2,
0,
};
args.virt = (cell_t)virt;
args.size = size;
openfirmware(&args);
}
/*
* Control transfer functions
*/
/* Suspend and drop back to the Open Firmware interface. */
static void
ofw_real_enter(ofw_t ofw)
{
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
} args = {
(cell_t)"enter",
0,
0,
};
openfirmware(&args);
/* We may come back. */
}
/* Shut down and drop back to the Open Firmware interface. */
static void
ofw_real_exit(ofw_t ofw)
{
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
} args = {
(cell_t)"exit",
0,
0,
};
openfirmware(&args);
for (;;) /* just in case */
;
}
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