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a9ff696160
Making virt_to_pfn() a static inline taking a strongly typed (const void *) makes the contract of a passing a pointer of that type to the function explicit and exposes any misuse of the macro virt_to_pfn() acting polymorphic and accepting many types such as (void *), (unitptr_t) or (unsigned long) as arguments without warnings. Doing this is a bit intrusive: virt_to_pfn() requires PHYS_PFN_OFFSET and PAGE_SHIFT to be defined, and this is defined in <asm/page.h>, so this must be included *before* <asm/memory.h>. The use of macros were obscuring the unclear inclusion order here, as the macros would eventually be resolved, but a static inline like this cannot be compiled with unresolved macros. The naive solution to include <asm/page.h> at the top of <asm/memory.h> does not work, because <asm/memory.h> sometimes includes <asm/page.h> at the end of itself, which would create a confusing inclusion loop. So instead, take the approach to always unconditionally include <asm/page.h> at the end of <asm/memory.h> arch/arm uses <asm/memory.h> explicitly in a lot of places, however it turns out that if we just unconditionally include <asm/memory.h> into <asm/page.h> and switch all inclusions of <asm/memory.h> to <asm/page.h> instead, we enforce the right order and <asm/memory.h> will always have access to the definitions. Put an inclusion guard in place making it impossible to include <asm/memory.h> explicitly. Link: https://lore.kernel.org/linux-mm/20220701160004.2ffff4e5ab59a55499f4c736@linux-foundation.org/ Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Hardware parameter area specific to Sharp SL series devices
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*
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* Copyright (c) 2005 Richard Purdie
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*
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* Based on Sharp's 2.4 kernel patches
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <asm/mach/sharpsl_param.h>
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#include <asm/page.h>
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/*
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* Certain hardware parameters determined at the time of device manufacture,
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* typically including LCD parameters are loaded by the bootloader at the
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* address PARAM_BASE. As the kernel will overwrite them, we need to store
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* them early in the boot process, then pass them to the appropriate drivers.
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* Not all devices use all parameters but the format is common to all.
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*/
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#ifdef CONFIG_ARCH_SA1100
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#define PARAM_BASE 0xe8ffc000
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#define param_start(x) (void *)(x)
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#else
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#define PARAM_BASE 0xa0000a00
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#define param_start(x) __va(x)
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#endif
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#define MAGIC_CHG(a,b,c,d) ( ( d << 24 ) | ( c << 16 ) | ( b << 8 ) | a )
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#define COMADJ_MAGIC MAGIC_CHG('C','M','A','D')
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#define UUID_MAGIC MAGIC_CHG('U','U','I','D')
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#define TOUCH_MAGIC MAGIC_CHG('T','U','C','H')
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#define AD_MAGIC MAGIC_CHG('B','V','A','D')
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#define PHAD_MAGIC MAGIC_CHG('P','H','A','D')
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struct sharpsl_param_info sharpsl_param;
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EXPORT_SYMBOL(sharpsl_param);
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void sharpsl_save_param(void)
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{
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struct sharpsl_param_info *params = param_start(PARAM_BASE);
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memcpy(&sharpsl_param, params, sizeof(*params));
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if (sharpsl_param.comadj_keyword != COMADJ_MAGIC)
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sharpsl_param.comadj=-1;
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if (sharpsl_param.phad_keyword != PHAD_MAGIC)
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sharpsl_param.phadadj=-1;
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if (sharpsl_param.uuid_keyword != UUID_MAGIC)
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sharpsl_param.uuid[0]=-1;
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if (sharpsl_param.touch_keyword != TOUCH_MAGIC)
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sharpsl_param.touch_xp=-1;
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if (sharpsl_param.adadj_keyword != AD_MAGIC)
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sharpsl_param.adadj=-1;
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}
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