1 files changed, 388 insertions, 0 deletions
diff --git a/include/asm-arm/arch-ixp4xx/io.h b/include/asm-arm/arch-ixp4xx/io.h
new file mode 100644
index 000000000000..c27b9d3079a7
--- /dev/null
+++ b/include/asm-arm/arch-ixp4xx/io.h
@@ -0,0 +1,388 @@
+/*
+ * linux/include/asm-arm/arch-ixp4xx/io.h
+ *
+ * Author: Deepak Saxena <dsaxena@plexity.net>
+ *
+ * Copyright (C) 2002-2004  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 <asm/hardware.h>
+
+#define IO_SPACE_LIMIT 0xffff0000
+
+#define	BIT(x)	((1)<<(x))
+
+
+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 
+ *    problamatic if using video cards and other memory-heavy
+ *    targets.
+ *
+ * 2) If > 64MB of memory space is required, the IXP4xx can be configured
+ *    to use indirect registers to access PCI (as we do below for I/O
+ *    transactions). This allows for up to 128MB (0x48000000 to 0x4fffffff)
+ *    of memory on the bus. The disadvantadge 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
+
+#include <linux/mm.h>
+
+/*
+ * 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 void __iomem *
+__ixp4xx_ioremap(unsigned long addr, size_t size, unsigned long flags, unsigned long align)
+{
+	extern void __iomem * __ioremap(unsigned long, size_t, unsigned long, unsigned long);
+	if((addr < 0x48000000) || (addr > 0x4fffffff))
+		return __ioremap(addr, size, flags, align);
+
+	return (void *)addr;
+}
+
+static inline void
+__ixp4xx_iounmap(void __iomem *addr)
+{
+	extern void __iounmap(void __iomem *addr);
+
+	if ((u32)addr >= VMALLOC_START)
+		__iounmap(addr);
+}
+
+#define __arch_ioremap(a, s, f, x)	__ixp4xx_ioremap(a, s, f, x)
+#define	__arch_iounmap(a)		__ixp4xx_iounmap(a)
+
+#define	writeb(p, v)			__ixp4xx_writeb(p, v)
+#define	writew(p, v)			__ixp4xx_writew(p, v)
+#define	writel(p, v)			__ixp4xx_writel(p, v)
+
+#define	writesb(p, v, l)		__ixp4xx_writesb(p, v, l)
+#define	writesw(p, v, l)		__ixp4xx_writesw(p, v, l)
+#define	writesl(p, v, l)		__ixp4xx_writesl(p, v, l)
+	
+#define	readb(p)			__ixp4xx_readb(p)
+#define	readw(p)			__ixp4xx_readw(p)
+#define	readl(p)			__ixp4xx_readl(p)
+	
+#define	readsb(p, v, l)			__ixp4xx_readsb(p, v, l)
+#define	readsw(p, v, l)			__ixp4xx_readsw(p, v, l)
+#define	readsl(p, v, l)			__ixp4xx_readsl(p, v, l)
+
+static inline void 
+__ixp4xx_writeb(u8 value, u32 addr)
+{
+	u32 n, byte_enables, data;
+
+	if (addr >= VMALLOC_START) {
+		__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
+__ixp4xx_writesb(u32 bus_addr, u8 *vaddr, int count)
+{
+	while (count--)
+		writeb(*vaddr++, bus_addr);
+}
+
+static inline void 
+__ixp4xx_writew(u16 value, u32 addr)
+{
+	u32 n, byte_enables, data;
+
+	if (addr >= VMALLOC_START) {
+		__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
+__ixp4xx_writesw(u32 bus_addr, u16 *vaddr, int count)
+{
+	while (count--)
+		writew(*vaddr++, bus_addr);
+}
+
+static inline void 
+__ixp4xx_writel(u32 value, u32 addr)
+{
+	if (addr >= VMALLOC_START) {
+		__raw_writel(value, addr);
+		return;
+	}
+
+	ixp4xx_pci_write(addr, NP_CMD_MEMWRITE, value);
+}
+
+static inline void
+__ixp4xx_writesl(u32 bus_addr, u32 *vaddr, int count)
+{
+	while (count--)
+		writel(*vaddr++, bus_addr);
+}
+
+static inline unsigned char 
+__ixp4xx_readb(u32 addr)
+{
+	u32 n, byte_enables, data;
+
+	if (addr >= VMALLOC_START)
+		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
+__ixp4xx_readsb(u32 bus_addr, u8 *vaddr, u32 count)
+{
+	while (count--)
+		*vaddr++ = readb(bus_addr);
+}
+
+static inline unsigned short 
+__ixp4xx_readw(u32 addr)
+{
+	u32 n, byte_enables, data;
+
+	if (addr >= VMALLOC_START)
+		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 
+__ixp4xx_readsw(u32 bus_addr, u16 *vaddr, u32 count)
+{
+	while (count--)
+		*vaddr++ = readw(bus_addr);
+}
+
+static inline unsigned long 
+__ixp4xx_readl(u32 addr)
+{
+	u32 data;
+
+	if (addr >= VMALLOC_START)
+		return __raw_readl(addr);
+
+	if (ixp4xx_pci_read(addr, NP_CMD_MEMREAD, &data))
+		return 0xffffffff;
+
+	return data;
+}
+
+static inline void 
+__ixp4xx_readsl(u32 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))
+
+#define eth_io_copy_and_sum(s,c,l,b) \
+				eth_copy_and_sum((s),__mem_pci(c),(l),(b))
+
+static inline int
+check_signature(unsigned long bus_addr, const unsigned char *signature,
+		int length)
+{
+	int retval = 0;
+	do {
+		if (readb(bus_addr) != *signature)
+			goto out;
+		bus_addr++;
+		signature++;
+		length--;
+	} while (length);
+	retval = 1;
+out:
+	return retval;
+}
+
+#endif
+
+/*
+ * 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.
+ */
+#define	outb(p, v)			__ixp4xx_outb(p, v)
+#define	outw(p, v)			__ixp4xx_outw(p, v)
+#define	outl(p, v)			__ixp4xx_outl(p, v)
+	
+#define	outsb(p, v, l)			__ixp4xx_outsb(p, v, l)
+#define	outsw(p, v, l)			__ixp4xx_outsw(p, v, l)
+#define	outsl(p, v, l)			__ixp4xx_outsl(p, v, l)
+
+#define	inb(p)				__ixp4xx_inb(p)
+#define	inw(p)				__ixp4xx_inw(p)
+#define	inl(p)				__ixp4xx_inl(p)
+
+#define	insb(p, v, l)			__ixp4xx_insb(p, v, l)
+#define	insw(p, v, l)			__ixp4xx_insw(p, v, l)
+#define	insl(p, v, l)			__ixp4xx_insl(p, v, l)
+
+
+static inline void 
+__ixp4xx_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 
+__ixp4xx_outsb(u32 io_addr, const u8 *vaddr, u32 count)
+{
+	while (count--)
+		outb(*vaddr++, io_addr);
+}
+
+static inline void 
+__ixp4xx_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 
+__ixp4xx_outsw(u32 io_addr, const u16 *vaddr, u32 count)
+{
+	while (count--)
+		outw(cpu_to_le16(*vaddr++), io_addr);
+}
+
+static inline void 
+__ixp4xx_outl(u32 value, u32 addr)
+{
+	ixp4xx_pci_write(addr, NP_CMD_IOWRITE, value);
+}
+
+static inline void 
+__ixp4xx_outsl(u32 io_addr, const u32 *vaddr, u32 count)
+{
+	while (count--)
+		outl(*vaddr++, io_addr);
+}
+
+static inline u8 
+__ixp4xx_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 
+__ixp4xx_insb(u32 io_addr, u8 *vaddr, u32 count)
+{
+	while (count--)
+		*vaddr++ = inb(io_addr);
+}
+
+static inline u16 
+__ixp4xx_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 
+__ixp4xx_insw(u32 io_addr, u16 *vaddr, u32 count)
+{
+	while (count--)
+		*vaddr++ = le16_to_cpu(inw(io_addr));
+}
+
+static inline u32 
+__ixp4xx_inl(u32 addr)
+{
+	u32 data;
+	if (ixp4xx_pci_read(addr, NP_CMD_IOREAD, &data))
+		return 0xffffffff;
+
+	return data;
+}
+
+static inline void 
+__ixp4xx_insl(u32 io_addr, u32 *vaddr, u32 count)
+{
+	while (count--)
+		*vaddr++ = inl(io_addr);
+}
+
+
+#endif	//  __ASM_ARM_ARCH_IO_H
+