cca48a59de
implementations. Early in the boot the kernel will use an approximate, however after the timer has been probed it will switch to a more accurate implementation. Reviewed by: manu Sponsored by: ABT Systems Ltd Differential Revision: https://reviews.freebsd.org/D5762
135 lines
3.8 KiB
C
135 lines
3.8 KiB
C
/*-
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* Copyright (c) 2005 Peter Grehan
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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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* 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 AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_PLATFORMVAR_H_
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#define _MACHINE_PLATFORMVAR_H_
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/*
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* An ARM platform implementation is declared with a kernel object and
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* an associated method table, similar to a device driver.
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*
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* e.g.
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*
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* static platform_method_t bcm2835_methods[] = {
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* PLATFORMMETHOD(platform_probe, bcm2835_probe),
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* ...
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* PLATFORMMETHOD_END
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* };
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*
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* static platform_def_t bcm3835_platform = {
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* "bcm2835",
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* bcm2835_methods,
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* sizeof(bcm2835_platform_softc), // or 0 if no softc
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* };
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*
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* PLATFORM_DEF(bcm2835_platform);
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*/
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#include <sys/kobj.h>
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#include <sys/linker_set.h>
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struct platform_class {
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KOBJ_CLASS_FIELDS;
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/* How many times to loop to delay approximately 1us */
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int delay_count;
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};
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struct platform_kobj {
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/*
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* A platform instance is a kernel object
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*/
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KOBJ_FIELDS;
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/* Platform class, for access to class specific data */
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struct platform_class *cls;
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};
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struct platform_data {
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int delay_count;
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};
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typedef struct platform_kobj *platform_t;
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typedef struct platform_class platform_def_t;
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#define platform_method_t kobj_method_t
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#define PLATFORMMETHOD KOBJMETHOD
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#define PLATFORMMETHOD_END KOBJMETHOD_END
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#define PLATFORM_DEF(name) DATA_SET(platform_set, name)
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#ifdef FDT
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struct fdt_platform_class {
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KOBJ_CLASS_FIELDS;
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const char *fdt_compatible;
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};
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typedef struct fdt_platform_class fdt_platform_def_t;
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extern platform_method_t fdt_platform_methods[];
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#ifdef MULTIDELAY
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#define FDT_PLATFORM_CTASSERT(delay) CTASSERT(delay > 0)
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#else
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#define FDT_PLATFORM_CTASSERT(delay) CTASSERT(delay == 0)
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#endif
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#define PLATFORM_DATA(NAME, delay) \
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static struct platform_data NAME ## _platc = { \
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.delay_count = delay; \
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};
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#define FDT_PLATFORM_DEF2(NAME, VAR_NAME, NAME_STR, size, compatible, \
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delay) \
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FDT_PLATFORM_CTASSERT(delay); \
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static fdt_platform_def_t VAR_NAME ## _fdt_platform = { \
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.name = NAME_STR, \
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.methods = fdt_platform_methods, \
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.fdt_compatible = compatible, \
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}; \
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static kobj_class_t VAR_NAME ## _baseclasses[] = \
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{ (kobj_class_t)&VAR_NAME ## _fdt_platform, NULL }; \
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static platform_def_t VAR_NAME ## _platform = { \
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NAME_STR, \
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NAME ## _methods, \
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size, \
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VAR_NAME ## _baseclasses, \
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delay, \
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}; \
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DATA_SET(platform_set, VAR_NAME ## _platform)
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#define FDT_PLATFORM_DEF(NAME, NAME_STR, size, compatible, delay) \
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FDT_PLATFORM_DEF2(NAME, NAME, NAME_STR, size, compatible, delay)
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#endif
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bool arm_tmr_timed_wait(platform_t, int);
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#endif /* _MACHINE_PLATFORMVAR_H_ */
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