86e4dd5add
This extends some of the existing special casing for HAS_IOPORT platforms and gets it to the point where platforms can begin to conditionally select it. The major changes here are that the PIO routines themselves go away completely, including all of the machvec port mapping wrappers. With this in place it's possible for any non-machvec abusing platform to disable PIO completely. At present this is left as an opt-in until the abusers are the odd ones out instead of the majority. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
181 lines
3.7 KiB
C
181 lines
3.7 KiB
C
/*
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* arch/sh/kernel/io_generic.c
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*
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* Copyright (C) 2000 Niibe Yutaka
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* Copyright (C) 2005 - 2007 Paul Mundt
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*
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* Generic I/O routine. These can be used where a machine specific version
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* is not required.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/module.h>
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#include <linux/io.h>
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#include <asm/machvec.h>
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#ifdef CONFIG_CPU_SH3
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/* SH3 has a PCMCIA bug that needs a dummy read from area 6 for a
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* workaround. */
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/* I'm not sure SH7709 has this kind of bug */
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#define dummy_read() __raw_readb(0xba000000)
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#else
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#define dummy_read()
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#endif
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unsigned long generic_io_base = 0;
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u8 generic_inb(unsigned long port)
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{
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return __raw_readb(__ioport_map(port, 1));
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}
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u16 generic_inw(unsigned long port)
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{
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return __raw_readw(__ioport_map(port, 2));
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}
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u32 generic_inl(unsigned long port)
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{
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return __raw_readl(__ioport_map(port, 4));
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}
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u8 generic_inb_p(unsigned long port)
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{
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unsigned long v = generic_inb(port);
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ctrl_delay();
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return v;
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}
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u16 generic_inw_p(unsigned long port)
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{
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unsigned long v = generic_inw(port);
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ctrl_delay();
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return v;
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}
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u32 generic_inl_p(unsigned long port)
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{
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unsigned long v = generic_inl(port);
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ctrl_delay();
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return v;
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}
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/*
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* insb/w/l all read a series of bytes/words/longs from a fixed port
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* address. However as the port address doesn't change we only need to
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* convert the port address to real address once.
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*/
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void generic_insb(unsigned long port, void *dst, unsigned long count)
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{
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__raw_readsb(__ioport_map(port, 1), dst, count);
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dummy_read();
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}
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void generic_insw(unsigned long port, void *dst, unsigned long count)
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{
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__raw_readsw(__ioport_map(port, 2), dst, count);
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dummy_read();
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}
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void generic_insl(unsigned long port, void *dst, unsigned long count)
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{
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__raw_readsl(__ioport_map(port, 4), dst, count);
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dummy_read();
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}
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void generic_outb(u8 b, unsigned long port)
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{
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__raw_writeb(b, __ioport_map(port, 1));
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}
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void generic_outw(u16 b, unsigned long port)
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{
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__raw_writew(b, __ioport_map(port, 2));
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}
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void generic_outl(u32 b, unsigned long port)
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{
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__raw_writel(b, __ioport_map(port, 4));
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}
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void generic_outb_p(u8 b, unsigned long port)
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{
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generic_outb(b, port);
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ctrl_delay();
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}
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void generic_outw_p(u16 b, unsigned long port)
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{
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generic_outw(b, port);
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ctrl_delay();
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}
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void generic_outl_p(u32 b, unsigned long port)
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{
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generic_outl(b, port);
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ctrl_delay();
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}
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/*
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* outsb/w/l all write a series of bytes/words/longs to a fixed port
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* address. However as the port address doesn't change we only need to
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* convert the port address to real address once.
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*/
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void generic_outsb(unsigned long port, const void *src, unsigned long count)
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{
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__raw_writesb(__ioport_map(port, 1), src, count);
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dummy_read();
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}
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void generic_outsw(unsigned long port, const void *src, unsigned long count)
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{
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__raw_writesw(__ioport_map(port, 2), src, count);
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dummy_read();
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}
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void generic_outsl(unsigned long port, const void *src, unsigned long count)
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{
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__raw_writesl(__ioport_map(port, 4), src, count);
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dummy_read();
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}
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void __iomem *generic_ioport_map(unsigned long addr, unsigned int size)
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{
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#ifdef P1SEG
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if (PXSEG(addr) >= P1SEG)
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return (void __iomem *)addr;
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#endif
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return (void __iomem *)(addr + generic_io_base);
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}
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void generic_ioport_unmap(void __iomem *addr)
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{
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}
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#ifndef CONFIG_GENERIC_IOMAP
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void __iomem *ioport_map(unsigned long port, unsigned int nr)
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{
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void __iomem *ret;
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ret = __ioport_map_trapped(port, nr);
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if (ret)
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return ret;
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return __ioport_map(port, nr);
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}
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EXPORT_SYMBOL(ioport_map);
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void ioport_unmap(void __iomem *addr)
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{
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sh_mv.mv_ioport_unmap(addr);
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}
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EXPORT_SYMBOL(ioport_unmap);
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#endif /* CONFIG_GENERIC_IOMAP */
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