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io.h

/*
 * arch/arm/mach-ixp4xx/include/mach/io.h
 *
 * Author: Deepak Saxena <dsaxena@plexity.net>
 *
 * Copyright (C) 2002-2005  MontaVista Software, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#ifndef __ASM_ARM_ARCH_IO_H
#define __ASM_ARM_ARCH_IO_H

#include <linux/bitops.h>

#include <mach/hardware.h>

#define IO_SPACE_LIMIT 0x0000ffff

extern int (*ixp4xx_pci_read)(u32 addr, u32 cmd, u32* data);
extern int ixp4xx_pci_write(u32 addr, u32 cmd, u32 data);


/*
 * IXP4xx provides two methods of accessing PCI memory space:
 *
 * 1) A direct mapped window from 0x48000000 to 0x4BFFFFFF (64MB).
 *    To access PCI via this space, we simply ioremap() the BAR
 *    into the kernel and we can use the standard read[bwl]/write[bwl]
 *    macros. This is the preffered method due to speed but it
 *    limits the system to just 64MB of PCI memory. This can be
 *    problematic if using video cards and other memory-heavy targets.
 *
 * 2) If > 64MB of memory space is required, the IXP4xx can use indirect
 *    registers to access the whole 4 GB of PCI memory space (as we do below
 *    for I/O transactions). This allows currently for up to 1 GB (0x10000000
 *    to 0x4FFFFFFF) of memory on the bus. The disadvantage of this is that
 *    every PCI access requires three local register accesses plus a spinlock,
 *    but in some cases the performance hit is acceptable. In addition, you
 *    cannot mmap() PCI devices in this case.
 */
#ifndef     CONFIG_IXP4XX_INDIRECT_PCI

#define __mem_pci(a)          (a)

#else

/*
 * In the case of using indirect PCI, we simply return the actual PCI
 * address and our read/write implementation use that to drive the 
 * access registers. If something outside of PCI is ioremap'd, we
 * fallback to the default.
 */

static inline int is_pci_memory(u32 addr)
{
      return (addr >= PCIBIOS_MIN_MEM) && (addr <= 0x4FFFFFFF);
}

static inline void __iomem * __indirect_ioremap(unsigned long addr, size_t size,
                                    unsigned int mtype)
{
      if (!is_pci_memory(addr))
            return __arm_ioremap(addr, size, mtype);

      return (void __iomem *)addr;
}

static inline void __indirect_iounmap(void __iomem *addr)
{
      if (!is_pci_memory((__force u32)addr))
            __iounmap(addr);
}

#define __arch_ioremap              __indirect_ioremap
#define __arch_iounmap              __indirect_iounmap

#define writeb(v, p)                __indirect_writeb(v, p)
#define writew(v, p)                __indirect_writew(v, p)
#define writel(v, p)                __indirect_writel(v, p)

#define writesb(p, v, l)            __indirect_writesb(p, v, l)
#define writesw(p, v, l)            __indirect_writesw(p, v, l)
#define writesl(p, v, l)            __indirect_writesl(p, v, l)

#define readb(p)              __indirect_readb(p)
#define readw(p)              __indirect_readw(p)
#define readl(p)              __indirect_readl(p)

#define readsb(p, v, l)             __indirect_readsb(p, v, l)
#define readsw(p, v, l)             __indirect_readsw(p, v, l)
#define readsl(p, v, l)             __indirect_readsl(p, v, l)

static inline void __indirect_writeb(u8 value, volatile void __iomem *p)
{
      u32 addr = (u32)p;
      u32 n, byte_enables, data;

      if (!is_pci_memory(addr)) {
            __raw_writeb(value, addr);
            return;
      }

      n = addr % 4;
      byte_enables = (0xf & ~BIT(n)) << IXP4XX_PCI_NP_CBE_BESL;
      data = value << (8*n);
      ixp4xx_pci_write(addr, byte_enables | NP_CMD_MEMWRITE, data);
}

static inline void __indirect_writesb(volatile void __iomem *bus_addr,
                              const u8 *vaddr, int count)
{
      while (count--)
            writeb(*vaddr++, bus_addr);
}

static inline void __indirect_writew(u16 value, volatile void __iomem *p)
{
      u32 addr = (u32)p;
      u32 n, byte_enables, data;

      if (!is_pci_memory(addr)) {
            __raw_writew(value, addr);
            return;
      }

      n = addr % 4;
      byte_enables = (0xf & ~(BIT(n) | BIT(n+1))) << IXP4XX_PCI_NP_CBE_BESL;
      data = value << (8*n);
      ixp4xx_pci_write(addr, byte_enables | NP_CMD_MEMWRITE, data);
}

static inline void __indirect_writesw(volatile void __iomem *bus_addr,
                              const u16 *vaddr, int count)
{
      while (count--)
            writew(*vaddr++, bus_addr);
}

static inline void __indirect_writel(u32 value, volatile void __iomem *p)
{
      u32 addr = (__force u32)p;

      if (!is_pci_memory(addr)) {
            __raw_writel(value, p);
            return;
      }

      ixp4xx_pci_write(addr, NP_CMD_MEMWRITE, value);
}

static inline void __indirect_writesl(volatile void __iomem *bus_addr,
                              const u32 *vaddr, int count)
{
      while (count--)
            writel(*vaddr++, bus_addr);
}

static inline unsigned char __indirect_readb(const volatile void __iomem *p)
{
      u32 addr = (u32)p;
      u32 n, byte_enables, data;

      if (!is_pci_memory(addr))
            return __raw_readb(addr);

      n = addr % 4;
      byte_enables = (0xf & ~BIT(n)) << IXP4XX_PCI_NP_CBE_BESL;
      if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_MEMREAD, &data))
            return 0xff;

      return data >> (8*n);
}

static inline void __indirect_readsb(const volatile void __iomem *bus_addr,
                             u8 *vaddr, u32 count)
{
      while (count--)
            *vaddr++ = readb(bus_addr);
}

static inline unsigned short __indirect_readw(const volatile void __iomem *p)
{
      u32 addr = (u32)p;
      u32 n, byte_enables, data;

      if (!is_pci_memory(addr))
            return __raw_readw(addr);

      n = addr % 4;
      byte_enables = (0xf & ~(BIT(n) | BIT(n+1))) << IXP4XX_PCI_NP_CBE_BESL;
      if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_MEMREAD, &data))
            return 0xffff;

      return data>>(8*n);
}

static inline void __indirect_readsw(const volatile void __iomem *bus_addr,
                             u16 *vaddr, u32 count)
{
      while (count--)
            *vaddr++ = readw(bus_addr);
}

static inline unsigned long __indirect_readl(const volatile void __iomem *p)
{
      u32 addr = (__force u32)p;
      u32 data;

      if (!is_pci_memory(addr))
            return __raw_readl(p);

      if (ixp4xx_pci_read(addr, NP_CMD_MEMREAD, &data))
            return 0xffffffff;

      return data;
}

static inline void __indirect_readsl(const volatile void __iomem *bus_addr,
                             u32 *vaddr, u32 count)
{
      while (count--)
            *vaddr++ = readl(bus_addr);
}


/*
 * We can use the built-in functions b/c they end up calling writeb/readb
 */
#define memset_io(c,v,l)            _memset_io((c),(v),(l))
#define memcpy_fromio(a,c,l)        _memcpy_fromio((a),(c),(l))
#define memcpy_toio(c,a,l)          _memcpy_toio((c),(a),(l))

#endif /* CONFIG_IXP4XX_INDIRECT_PCI */

#ifndef CONFIG_PCI

#define     __io(v)           __typesafe_io(v)

#else

/*
 * IXP4xx does not have a transparent cpu -> PCI I/O translation
 * window.  Instead, it has a set of registers that must be tweaked
 * with the proper byte lanes, command types, and address for the
 * transaction.  This means that we need to override the default
 * I/O functions.
 */

static inline void outb(u8 value, u32 addr)
{
      u32 n, byte_enables, data;
      n = addr % 4;
      byte_enables = (0xf & ~BIT(n)) << IXP4XX_PCI_NP_CBE_BESL;
      data = value << (8*n);
      ixp4xx_pci_write(addr, byte_enables | NP_CMD_IOWRITE, data);
}

static inline void outsb(u32 io_addr, const u8 *vaddr, u32 count)
{
      while (count--)
            outb(*vaddr++, io_addr);
}

static inline void outw(u16 value, u32 addr)
{
      u32 n, byte_enables, data;
      n = addr % 4;
      byte_enables = (0xf & ~(BIT(n) | BIT(n+1))) << IXP4XX_PCI_NP_CBE_BESL;
      data = value << (8*n);
      ixp4xx_pci_write(addr, byte_enables | NP_CMD_IOWRITE, data);
}

static inline void outsw(u32 io_addr, const u16 *vaddr, u32 count)
{
      while (count--)
            outw(cpu_to_le16(*vaddr++), io_addr);
}

static inline void outl(u32 value, u32 addr)
{
      ixp4xx_pci_write(addr, NP_CMD_IOWRITE, value);
}

static inline void outsl(u32 io_addr, const u32 *vaddr, u32 count)
{
      while (count--)
            outl(cpu_to_le32(*vaddr++), io_addr);
}

static inline u8 inb(u32 addr)
{
      u32 n, byte_enables, data;
      n = addr % 4;
      byte_enables = (0xf & ~BIT(n)) << IXP4XX_PCI_NP_CBE_BESL;
      if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_IOREAD, &data))
            return 0xff;

      return data >> (8*n);
}

static inline void insb(u32 io_addr, u8 *vaddr, u32 count)
{
      while (count--)
            *vaddr++ = inb(io_addr);
}

static inline u16 inw(u32 addr)
{
      u32 n, byte_enables, data;
      n = addr % 4;
      byte_enables = (0xf & ~(BIT(n) | BIT(n+1))) << IXP4XX_PCI_NP_CBE_BESL;
      if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_IOREAD, &data))
            return 0xffff;

      return data>>(8*n);
}

static inline void insw(u32 io_addr, u16 *vaddr, u32 count)
{
      while (count--)
            *vaddr++ = le16_to_cpu(inw(io_addr));
}

static inline u32 inl(u32 addr)
{
      u32 data;
      if (ixp4xx_pci_read(addr, NP_CMD_IOREAD, &data))
            return 0xffffffff;

      return data;
}

static inline void insl(u32 io_addr, u32 *vaddr, u32 count)
{
      while (count--)
            *vaddr++ = le32_to_cpu(inl(io_addr));
}

#define PIO_OFFSET      0x10000UL
#define PIO_MASK        0x0ffffUL

#define     __is_io_address(p)      (((unsigned long)p >= PIO_OFFSET) && \
                              ((unsigned long)p <= (PIO_MASK + PIO_OFFSET)))

#define     ioread8(p)              ioread8(p)
static inline unsigned int ioread8(const void __iomem *addr)
{
      unsigned long port = (unsigned long __force)addr;
      if (__is_io_address(port))
            return (unsigned int)inb(port & PIO_MASK);
      else
#ifndef CONFIG_IXP4XX_INDIRECT_PCI
            return (unsigned int)__raw_readb(addr);
#else
            return (unsigned int)__indirect_readb(addr);
#endif
}

#define     ioread8_rep(p, v, c)          ioread8_rep(p, v, c)
static inline void ioread8_rep(const void __iomem *addr, void *vaddr, u32 count)
{
      unsigned long port = (unsigned long __force)addr;
      if (__is_io_address(port))
            insb(port & PIO_MASK, vaddr, count);
      else
#ifndef     CONFIG_IXP4XX_INDIRECT_PCI
            __raw_readsb(addr, vaddr, count);
#else
            __indirect_readsb(addr, vaddr, count);
#endif
}

#define     ioread16(p)             ioread16(p)
static inline unsigned int ioread16(const void __iomem *addr)
{
      unsigned long port = (unsigned long __force)addr;
      if (__is_io_address(port))
            return      (unsigned int)inw(port & PIO_MASK);
      else
#ifndef CONFIG_IXP4XX_INDIRECT_PCI
            return le16_to_cpu((__force __le16)__raw_readw(addr));
#else
            return (unsigned int)__indirect_readw(addr);
#endif
}

#define     ioread16_rep(p, v, c)         ioread16_rep(p, v, c)
static inline void ioread16_rep(const void __iomem *addr, void *vaddr,
                        u32 count)
{
      unsigned long port = (unsigned long __force)addr;
      if (__is_io_address(port))
            insw(port & PIO_MASK, vaddr, count);
      else
#ifndef     CONFIG_IXP4XX_INDIRECT_PCI
            __raw_readsw(addr, vaddr, count);
#else
            __indirect_readsw(addr, vaddr, count);
#endif
}

#define     ioread32(p)             ioread32(p)
static inline unsigned int ioread32(const void __iomem *addr)
{
      unsigned long port = (unsigned long __force)addr;
      if (__is_io_address(port))
            return      (unsigned int)inl(port & PIO_MASK);
      else {
#ifndef CONFIG_IXP4XX_INDIRECT_PCI
            return le32_to_cpu((__force __le32)__raw_readl(addr));
#else
            return (unsigned int)__indirect_readl(addr);
#endif
      }
}

#define     ioread32_rep(p, v, c)         ioread32_rep(p, v, c)
static inline void ioread32_rep(const void __iomem *addr, void *vaddr,
                        u32 count)
{
      unsigned long port = (unsigned long __force)addr;
      if (__is_io_address(port))
            insl(port & PIO_MASK, vaddr, count);
      else
#ifndef     CONFIG_IXP4XX_INDIRECT_PCI
            __raw_readsl(addr, vaddr, count);
#else
            __indirect_readsl(addr, vaddr, count);
#endif
}

#define     iowrite8(v, p)                iowrite8(v, p)
static inline void iowrite8(u8 value, void __iomem *addr)
{
      unsigned long port = (unsigned long __force)addr;
      if (__is_io_address(port))
            outb(value, port & PIO_MASK);
      else
#ifndef CONFIG_IXP4XX_INDIRECT_PCI
            __raw_writeb(value, addr);
#else
            __indirect_writeb(value, addr);
#endif
}

#define     iowrite8_rep(p, v, c)         iowrite8_rep(p, v, c)
static inline void iowrite8_rep(void __iomem *addr, const void *vaddr,
                        u32 count)
{
      unsigned long port = (unsigned long __force)addr;
      if (__is_io_address(port))
            outsb(port & PIO_MASK, vaddr, count);
      else
#ifndef CONFIG_IXP4XX_INDIRECT_PCI
            __raw_writesb(addr, vaddr, count);
#else
            __indirect_writesb(addr, vaddr, count);
#endif
}

#define     iowrite16(v, p)               iowrite16(v, p)
static inline void iowrite16(u16 value, void __iomem *addr)
{
      unsigned long port = (unsigned long __force)addr;
      if (__is_io_address(port))
            outw(value, port & PIO_MASK);
      else
#ifndef CONFIG_IXP4XX_INDIRECT_PCI
            __raw_writew(cpu_to_le16(value), addr);
#else
            __indirect_writew(value, addr);
#endif
}

#define     iowrite16_rep(p, v, c)        iowrite16_rep(p, v, c)
static inline void iowrite16_rep(void __iomem *addr, const void *vaddr,
                         u32 count)
{
      unsigned long port = (unsigned long __force)addr;
      if (__is_io_address(port))
            outsw(port & PIO_MASK, vaddr, count);
      else
#ifndef CONFIG_IXP4XX_INDIRECT_PCI
            __raw_writesw(addr, vaddr, count);
#else
            __indirect_writesw(addr, vaddr, count);
#endif
}

#define     iowrite32(v, p)               iowrite32(v, p)
static inline void iowrite32(u32 value, void __iomem *addr)
{
      unsigned long port = (unsigned long __force)addr;
      if (__is_io_address(port))
            outl(value, port & PIO_MASK);
      else
#ifndef CONFIG_IXP4XX_INDIRECT_PCI
            __raw_writel((u32 __force)cpu_to_le32(value), addr);
#else
            __indirect_writel(value, addr);
#endif
}

#define     iowrite32_rep(p, v, c)        iowrite32_rep(p, v, c)
static inline void iowrite32_rep(void __iomem *addr, const void *vaddr,
                         u32 count)
{
      unsigned long port = (unsigned long __force)addr;
      if (__is_io_address(port))
            outsl(port & PIO_MASK, vaddr, count);
      else
#ifndef CONFIG_IXP4XX_INDIRECT_PCI
            __raw_writesl(addr, vaddr, count);
#else
            __indirect_writesl(addr, vaddr, count);
#endif
}

#define     ioport_map(port, nr)          ((void __iomem*)(port + PIO_OFFSET))
#define     ioport_unmap(addr)
#endif /* CONFIG_PCI */

#endif /* __ASM_ARM_ARCH_IO_H */

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