1 files changed, 526 insertions, 0 deletions
diff --git a/arch/arm/mach-ixp4xx/include/mach/io.h b/arch/arm/mach-ixp4xx/include/mach/io.h
new file mode 100644
index 00000000..57b5410c
--- /dev/null
+++ b/arch/arm/mach-ixp4xx/include/mach/io.h
@@ -0,0 +1,526 @@
+/*
+ * 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 */