xref: /kernel/linux/linux-5.10/arch/mips/include/asm/mach-generic/ide.h

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1994-1996  Linus Torvalds & authors
 *
 * Copied from i386; many of the especially older MIPS or ISA-based platforms
 * are basically identical.  Using this file probably implies i8259 PIC
 * support in a system but the very least interrupt numbers 0 - 15 need to
 * be put aside for legacy devices.
 */
#ifndef __ASM_MACH_GENERIC_IDE_H
#define __ASM_MACH_GENERIC_IDE_H

#ifdef __KERNEL__

#include <linux/pci.h>
#include <linux/stddef.h>
#include <asm/processor.h>

/* MIPS port and memory-mapped I/O string operations.  */
static inline void __ide_flush_prologue(void)
{
#ifdef CONFIG_SMP
	if (cpu_has_dc_aliases || !cpu_has_ic_fills_f_dc)
		preempt_disable();
#endif
}

static inline void __ide_flush_epilogue(void)
{
#ifdef CONFIG_SMP
	if (cpu_has_dc_aliases || !cpu_has_ic_fills_f_dc)
		preempt_enable();
#endif
}

static inline void __ide_flush_dcache_range(unsigned long addr, unsigned long size)
{
	if (cpu_has_dc_aliases || !cpu_has_ic_fills_f_dc) {
		unsigned long end = addr + size;

		while (addr < end) {
			local_flush_data_cache_page((void *)addr);
			addr += PAGE_SIZE;
		}
	}
}

/*
 * insw() and gang might be called with interrupts disabled, so we can't
 * send IPIs for flushing due to the potencial of deadlocks, see the comment
 * above smp_call_function() in arch/mips/kernel/smp.c.	 We work around the
 * problem by disabling preemption so we know we actually perform the flush
 * on the processor that actually has the lines to be flushed which hopefully
 * is even better for performance anyway.
 */
static inline void __ide_insw(unsigned long port, void *addr,
	unsigned int count)
{
	__ide_flush_prologue();
	insw(port, addr, count);
	__ide_flush_dcache_range((unsigned long)addr, count * 2);
	__ide_flush_epilogue();
}

static inline void __ide_insl(unsigned long port, void *addr, unsigned int count)
{
	__ide_flush_prologue();
	insl(port, addr, count);
	__ide_flush_dcache_range((unsigned long)addr, count * 4);
	__ide_flush_epilogue();
}

static inline void __ide_outsw(unsigned long port, const void *addr,
	unsigned long count)
{
	__ide_flush_prologue();
	outsw(port, addr, count);
	__ide_flush_dcache_range((unsigned long)addr, count * 2);
	__ide_flush_epilogue();
}

static inline void __ide_outsl(unsigned long port, const void *addr,
	unsigned long count)
{
	__ide_flush_prologue();
	outsl(port, addr, count);
	__ide_flush_dcache_range((unsigned long)addr, count * 4);
	__ide_flush_epilogue();
}

static inline void __ide_mm_insw(void __iomem *port, void *addr, u32 count)
{
	__ide_flush_prologue();
	readsw(port, addr, count);
	__ide_flush_dcache_range((unsigned long)addr, count * 2);
	__ide_flush_epilogue();
}

static inline void __ide_mm_insl(void __iomem *port, void *addr, u32 count)
{
	__ide_flush_prologue();
	readsl(port, addr, count);
	__ide_flush_dcache_range((unsigned long)addr, count * 4);
	__ide_flush_epilogue();
}

static inline void __ide_mm_outsw(void __iomem *port, void *addr, u32 count)
{
	__ide_flush_prologue();
	writesw(port, addr, count);
	__ide_flush_dcache_range((unsigned long)addr, count * 2);
	__ide_flush_epilogue();
}

static inline void __ide_mm_outsl(void __iomem * port, void *addr, u32 count)
{
	__ide_flush_prologue();
	writesl(port, addr, count);
	__ide_flush_dcache_range((unsigned long)addr, count * 4);
	__ide_flush_epilogue();
}

/* ide_insw calls insw, not __ide_insw.	 Why? */
#undef insw
#undef insl
#undef outsw
#undef outsl
#define insw(port, addr, count) __ide_insw(port, addr, count)
#define insl(port, addr, count) __ide_insl(port, addr, count)
#define outsw(port, addr, count) __ide_outsw(port, addr, count)
#define outsl(port, addr, count) __ide_outsl(port, addr, count)

#endif /* __KERNEL__ */

#endif /* __ASM_MACH_GENERIC_IDE_H */