Commit 140c1729 authored by Ralf Baechle's avatar Ralf Baechle
Browse files

[MIPS] Iomap implementation. 



This implementation has support for the concept of one separate ioport
address space by PCI domain.  A pointer to the virtual address where
the port space of a domain has been mapped has been added to struct
pci_controller and systems should be fixed to fill in this value. For
single domain systems this will be the same value as passed to
set_io_port_base().

Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 4c156994

arch/mips/lib/Makefile

+2 −1
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ lib-y += csum_partial.o memcpy.o memset.o promlib.o \ 
	   strlen_user.o strncpy_user.o strnlen_user.o uncached.o



obj-y			+= iomap.o

obj-$(CONFIG_PCI)	+= iomap-pci.o



# libgcc-style stuff needed in the kernel

lib-y += ashldi3.o ashrdi3.o lshrdi3.o

arch/mips/lib/iomap-pci.c

0 → 100644
+74 −0
Original line number Diff line number Diff line 
/*

 * Implement the default iomap interfaces

 *

 * (C) Copyright 2004 Linus Torvalds

 * (C) Copyright 2006 Ralf Baechle <ralf@linux-mips.org>

 * (C) Copyright 2007 MIPS Technologies, Inc.

 *     written by Ralf Baechle <ralf@linux-mips.org>

 */

#include <linux/pci.h>

#include <linux/module.h>

#include <asm/io.h>



static void __iomem *ioport_map_pci(struct pci_dev *dev,

                                     unsigned long port, unsigned int nr)

{

	struct pci_controller *ctrl = dev->bus->sysdata;

	unsigned long base = ctrl->io_map_base;



	/* This will eventually become a BUG_ON but for now be gentle */

	if (unlikely(!ctrl->io_map_base)) {

		struct pci_bus *bus = dev->bus;

		char name[8];



		while (bus->parent)

			bus = bus->parent;



		ctrl->io_map_base = base = mips_io_port_base;



		sprintf(name, "%04x:%02x", pci_domain_nr(bus), bus->number);

		printk(KERN_WARNING "io_map_base of root PCI bus %s unset.  "

		       "Trying to continue but you better\nfix this issue or "

		       "report it to linux-mips@linux-mips.org or your "

		       "vendor.\n", name);

#ifdef CONFIG_PCI_DOMAINS

		panic("To avoid data corruption io_map_base MUST be set with "

		      "multiple PCI domains.");

#endif

	}



	return (void __iomem *) (ctrl->io_map_base + port);

}



/*

 * Create a virtual mapping cookie for a PCI BAR (memory or IO)

 */

void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)

{

	unsigned long start = pci_resource_start(dev, bar);

	unsigned long len = pci_resource_len(dev, bar);

	unsigned long flags = pci_resource_flags(dev, bar);



	if (!len || !start)

		return NULL;

	if (maxlen && len > maxlen)

		len = maxlen;

	if (flags & IORESOURCE_IO)

		return ioport_map_pci(dev, start, len);

	if (flags & IORESOURCE_MEM) {

		if (flags & IORESOURCE_CACHEABLE)

			return ioremap(start, len);

		return ioremap_nocache(start, len);

	}

	/* What? */

	return NULL;

}



EXPORT_SYMBOL(pci_iomap);



void pci_iounmap(struct pci_dev *dev, void __iomem * addr)

{

	iounmap(addr);

}



EXPORT_SYMBOL(pci_iounmap);

arch/mips/lib/iomap.c

+201 −52
Original line number Diff line number Diff line 
/*

 *  iomap.c, Memory Mapped I/O routines for MIPS architecture.

 * Implement the default iomap interfaces

 *

 *  This code is based on lib/iomap.c, by Linus Torvalds.

 *

 *  Copyright (C) 2004-2005  Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License as published by

 *  the Free Software Foundation; either version 2 of the License, or

 *  (at your option) any later version.

 * (C) Copyright 2004 Linus Torvalds

 * (C) Copyright 2006 Ralf Baechle <ralf@linux-mips.org>

 * (C) Copyright 2007 MIPS Technologies, Inc.

 *     written by Ralf Baechle <ralf@linux-mips.org>

 */

#include <linux/pci.h>

#include <linux/module.h>

#include <asm/io.h>



/*

 * Read/write from/to an (offsettable) iomem cookie. It might be a PIO

 * access or a MMIO access, these functions don't care. The info is

 * encoded in the hardware mapping set up by the mapping functions

 * (or the cookie itself, depending on implementation and hw).

 *

 *  This program is distributed in the hope that it will be useful,

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *  GNU General Public License for more details.

 * The generic routines don't assume any hardware mappings, and just

 * encode the PIO/MMIO as part of the cookie. They coldly assume that

 * the MMIO IO mappings are not in the low address range.

 *

 *  You should have received a copy of the GNU General Public License

 *  along with this program; if not, write to the Free Software

 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 * Architectures for which this is not true can't use this generic

 * implementation and should do their own copy.

 */

#include <linux/ioport.h>

#include <linux/module.h>

#include <linux/pci.h>



#include <asm/io.h>

#define PIO_MASK	0x0ffffUL



void __iomem *ioport_map(unsigned long port, unsigned int nr)

unsigned int ioread8(void __iomem *addr)

{

	unsigned long end;

	return readb(addr);

}



	end = port + nr - 1UL;

	if (ioport_resource.start > port ||

	    ioport_resource.end < end || port > end)

		return NULL;

EXPORT_SYMBOL(ioread8);



	return (void __iomem *)(mips_io_port_base + port);

unsigned int ioread16(void __iomem *addr)

{

	return readw(addr);

}



void ioport_unmap(void __iomem *addr)

EXPORT_SYMBOL(ioread16);



unsigned int ioread16be(void __iomem *addr)

{

	return be16_to_cpu(__raw_readw(addr));

}

EXPORT_SYMBOL(ioport_map);

EXPORT_SYMBOL(ioport_unmap);



void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)

EXPORT_SYMBOL(ioread16be);



unsigned int ioread32(void __iomem *addr)

{

	unsigned long start, len, flags;

	return readl(addr);

}



	if (dev == NULL)

		return NULL;

EXPORT_SYMBOL(ioread32);



	start = pci_resource_start(dev, bar);

	len = pci_resource_len(dev, bar);

	if (!start || !len)

		return NULL;

unsigned int ioread32be(void __iomem *addr)

{

	return be32_to_cpu(__raw_readl(addr));

}



EXPORT_SYMBOL(ioread32be);



void iowrite8(u8 val, void __iomem *addr)

{

	writeb(val, addr);

}



EXPORT_SYMBOL(iowrite8);



void iowrite16(u16 val, void __iomem *addr)

{

	writew(val, addr);

}



EXPORT_SYMBOL(iowrite16);



void iowrite16be(u16 val, void __iomem *addr)

{

	__raw_writew(cpu_to_be16(val), addr);

}



EXPORT_SYMBOL(iowrite16be);



void iowrite32(u32 val, void __iomem *addr)

{

	writel(val, addr);

}



EXPORT_SYMBOL(iowrite32);



void iowrite32be(u32 val, void __iomem *addr)

{

	__raw_writel(cpu_to_be32(val), addr);

}



EXPORT_SYMBOL(iowrite32be);



/*

 * These are the "repeat MMIO read/write" functions.

 * Note the "__raw" accesses, since we don't want to

 * convert to CPU byte order. We write in "IO byte

 * order" (we also don't have IO barriers).

 */

static inline void mmio_insb(void __iomem *addr, u8 *dst, int count)

{

	while (--count >= 0) {

		u8 data = __raw_readb(addr);

		*dst = data;

		dst++;

	}

}



static inline void mmio_insw(void __iomem *addr, u16 *dst, int count)

{

	while (--count >= 0) {

		u16 data = __raw_readw(addr);

		*dst = data;

		dst++;

	}

}



static inline void mmio_insl(void __iomem *addr, u32 *dst, int count)

{

	while (--count >= 0) {

		u32 data = __raw_readl(addr);

		*dst = data;

		dst++;

	}

}



static inline void mmio_outsb(void __iomem *addr, const u8 *src, int count)

{

	while (--count >= 0) {

		__raw_writeb(*src, addr);

		src++;

	}

}



static inline void mmio_outsw(void __iomem *addr, const u16 *src, int count)

{

	while (--count >= 0) {

		__raw_writew(*src, addr);

		src++;

	}

}



	if (maxlen != 0 && len > maxlen)

		len = maxlen;

static inline void mmio_outsl(void __iomem *addr, const u32 *src, int count)

{

	while (--count >= 0) {

		__raw_writel(*src, addr);

		src++;

	}

}



void ioread8_rep(void __iomem *addr, void *dst, unsigned long count)

{

	mmio_insb(addr, dst, count);

}



EXPORT_SYMBOL(ioread8_rep);



	flags = pci_resource_flags(dev, bar);

	if (flags & IORESOURCE_IO)

		return ioport_map(start, len);

	if (flags & IORESOURCE_MEM) {

		if (flags & IORESOURCE_CACHEABLE)

			return ioremap_cachable(start, len);

		return ioremap_nocache(start, len);

void ioread16_rep(void __iomem *addr, void *dst, unsigned long count)

{

	mmio_insw(addr, dst, count);

}



EXPORT_SYMBOL(ioread16_rep);



void ioread32_rep(void __iomem *addr, void *dst, unsigned long count)

{

	mmio_insl(addr, dst, count);

}



EXPORT_SYMBOL(ioread32_rep);



void iowrite8_rep(void __iomem *addr, const void *src, unsigned long count)

{

	mmio_outsb(addr, src, count);

}



EXPORT_SYMBOL(iowrite8_rep);



void iowrite16_rep(void __iomem *addr, const void *src, unsigned long count)

{

	mmio_outsw(addr, src, count);

}



EXPORT_SYMBOL(iowrite16_rep);



void iowrite32_rep(void __iomem *addr, const void *src, unsigned long count)

{

	mmio_outsl(addr, src, count);

}



EXPORT_SYMBOL(iowrite32_rep);



/*

 * Create a virtual mapping cookie for an IO port range

 *

 * This uses the same mapping are as the in/out family which has to be setup

 * by the platform initialization code.

 *

 * Just to make matters somewhat more interesting on MIPS systems with

 * multiple host bridge each will have it's own ioport address space.

 */

static void __iomem *ioport_map_legacy(unsigned long port, unsigned int nr)

{

	return (void __iomem *) (mips_io_port_base + port);

}



void __iomem *ioport_map(unsigned long port, unsigned int nr)

{

	if (port > PIO_MASK)

		return NULL;



	return ioport_map_legacy(port, nr);

}



void pci_iounmap(struct pci_dev *dev, void __iomem *addr)

EXPORT_SYMBOL(ioport_map);



void ioport_unmap(void __iomem *addr)

{

	iounmap(addr);

	/* Nothing to do */

}

EXPORT_SYMBOL(pci_iomap);

EXPORT_SYMBOL(pci_iounmap);
 


EXPORT_SYMBOL(ioport_unmap);

arch/mips/pci/pci.c

+8 −0
Original line number Diff line number Diff line
@@ -79,6 +79,14 @@ void __init register_pci_controller(struct pci_controller *hose) 
{

	*hose_tail = hose;

	hose_tail = &hose->next;



	/*

	 * Do not panic here but later - this might hapen before console init.

	 */

	if (!hose->io_map_base) {

		printk(KERN_WARNING

		       "registering PCI controller with io_map_base unset\n");

	}

}



/* Most MIPS systems have straight-forward swizzling needs.  */

include/asm-mips/io.h

+1 −28
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ 
#include <asm/byteorder.h>

#include <asm/cpu.h>

#include <asm/cpu-features.h>

#include <asm-generic/iomap.h>

#include <asm/page.h>

#include <asm/pgtable-bits.h>

#include <asm/processor.h>
@@ -517,34 +518,6 @@ static inline void memcpy_toio(volatile void __iomem *dst, const void *src, int 
	memcpy((void __force *) dst, src, count);

}



/*

 * Memory Mapped I/O

 */

#define ioread8(addr)		readb(addr)

#define ioread16(addr)		readw(addr)

#define ioread32(addr)		readl(addr)



#define iowrite8(b,addr)	writeb(b,addr)

#define iowrite16(w,addr)	writew(w,addr)

#define iowrite32(l,addr)	writel(l,addr)



#define ioread8_rep(a,b,c)	readsb(a,b,c)

#define ioread16_rep(a,b,c)	readsw(a,b,c)

#define ioread32_rep(a,b,c)	readsl(a,b,c)



#define iowrite8_rep(a,b,c)	writesb(a,b,c)

#define iowrite16_rep(a,b,c)	writesw(a,b,c)

#define iowrite32_rep(a,b,c)	writesl(a,b,c)



/* Create a virtual mapping cookie for an IO port range */

extern void __iomem *ioport_map(unsigned long port, unsigned int nr);

extern void ioport_unmap(void __iomem *);



/* Create a virtual mapping cookie for a PCI BAR (memory or IO) */

struct pci_dev;

extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);

extern void pci_iounmap(struct pci_dev *dev, void __iomem *);



/*

 * ISA space is 'always mapped' on currently supported MIPS systems, no need

 * to explicitly ioremap() it. The fact that the ISA IO space is mapped

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