549 lines
14 KiB
C
549 lines
14 KiB
C
/*
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* arch/arm/mach-ixp4xx/include/mach/io.h
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*
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* Author: Deepak Saxena <dsaxena@plexity.net>
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*
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* Copyright (C) 2002-2005 MontaVista Software, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_ARM_ARCH_IO_H
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#define __ASM_ARM_ARCH_IO_H
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#include <linux/bitops.h>
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#include <mach/hardware.h>
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extern int (*ixp4xx_pci_read)(u32 addr, u32 cmd, u32* data);
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extern int ixp4xx_pci_write(u32 addr, u32 cmd, u32 data);
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/*
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* IXP4xx provides two methods of accessing PCI memory space:
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*
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* 1) A direct mapped window from 0x48000000 to 0x4BFFFFFF (64MB).
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* To access PCI via this space, we simply ioremap() the BAR
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* into the kernel and we can use the standard read[bwl]/write[bwl]
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* macros. This is the preffered method due to speed but it
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* limits the system to just 64MB of PCI memory. This can be
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* problematic if using video cards and other memory-heavy targets.
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*
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* 2) If > 64MB of memory space is required, the IXP4xx can use indirect
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* registers to access the whole 4 GB of PCI memory space (as we do below
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* for I/O transactions). This allows currently for up to 1 GB (0x10000000
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* to 0x4FFFFFFF) of memory on the bus. The disadvantage of this is that
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* every PCI access requires three local register accesses plus a spinlock,
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* but in some cases the performance hit is acceptable. In addition, you
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* cannot mmap() PCI devices in this case.
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*/
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#ifdef CONFIG_IXP4XX_INDIRECT_PCI
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/*
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* In the case of using indirect PCI, we simply return the actual PCI
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* address and our read/write implementation use that to drive the
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* access registers. If something outside of PCI is ioremap'd, we
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* fallback to the default.
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*/
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extern unsigned long pcibios_min_mem;
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static inline int is_pci_memory(u32 addr)
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{
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return (addr >= pcibios_min_mem) && (addr <= 0x4FFFFFFF);
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}
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#define writeb(v, p) __indirect_writeb(v, p)
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#define writew(v, p) __indirect_writew(v, p)
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#define writel(v, p) __indirect_writel(v, p)
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#define writeb_relaxed(v, p) __indirect_writeb(v, p)
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#define writew_relaxed(v, p) __indirect_writew(v, p)
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#define writel_relaxed(v, p) __indirect_writel(v, p)
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#define writesb(p, v, l) __indirect_writesb(p, v, l)
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#define writesw(p, v, l) __indirect_writesw(p, v, l)
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#define writesl(p, v, l) __indirect_writesl(p, v, l)
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#define readb(p) __indirect_readb(p)
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#define readw(p) __indirect_readw(p)
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#define readl(p) __indirect_readl(p)
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#define readb_relaxed(p) __indirect_readb(p)
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#define readw_relaxed(p) __indirect_readw(p)
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#define readl_relaxed(p) __indirect_readl(p)
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#define readsb(p, v, l) __indirect_readsb(p, v, l)
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#define readsw(p, v, l) __indirect_readsw(p, v, l)
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#define readsl(p, v, l) __indirect_readsl(p, v, l)
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static inline void __indirect_writeb(u8 value, volatile void __iomem *p)
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{
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u32 addr = (u32)p;
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u32 n, byte_enables, data;
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if (!is_pci_memory(addr)) {
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__raw_writeb(value, p);
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return;
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}
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n = addr % 4;
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byte_enables = (0xf & ~BIT(n)) << IXP4XX_PCI_NP_CBE_BESL;
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data = value << (8*n);
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ixp4xx_pci_write(addr, byte_enables | NP_CMD_MEMWRITE, data);
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}
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static inline void __indirect_writesb(volatile void __iomem *bus_addr,
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const void *p, int count)
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{
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const u8 *vaddr = p;
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while (count--)
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writeb(*vaddr++, bus_addr);
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}
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static inline void __indirect_writew(u16 value, volatile void __iomem *p)
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{
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u32 addr = (u32)p;
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u32 n, byte_enables, data;
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if (!is_pci_memory(addr)) {
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__raw_writew(value, p);
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return;
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}
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n = addr % 4;
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byte_enables = (0xf & ~(BIT(n) | BIT(n+1))) << IXP4XX_PCI_NP_CBE_BESL;
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data = value << (8*n);
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ixp4xx_pci_write(addr, byte_enables | NP_CMD_MEMWRITE, data);
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}
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static inline void __indirect_writesw(volatile void __iomem *bus_addr,
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const void *p, int count)
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{
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const u16 *vaddr = p;
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while (count--)
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writew(*vaddr++, bus_addr);
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}
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static inline void __indirect_writel(u32 value, volatile void __iomem *p)
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{
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u32 addr = (__force u32)p;
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if (!is_pci_memory(addr)) {
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__raw_writel(value, p);
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return;
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}
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ixp4xx_pci_write(addr, NP_CMD_MEMWRITE, value);
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}
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static inline void __indirect_writesl(volatile void __iomem *bus_addr,
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const void *p, int count)
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{
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const u32 *vaddr = p;
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while (count--)
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writel(*vaddr++, bus_addr);
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}
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static inline u8 __indirect_readb(const volatile void __iomem *p)
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{
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u32 addr = (u32)p;
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u32 n, byte_enables, data;
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if (!is_pci_memory(addr))
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return __raw_readb(p);
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n = addr % 4;
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byte_enables = (0xf & ~BIT(n)) << IXP4XX_PCI_NP_CBE_BESL;
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if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_MEMREAD, &data))
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return 0xff;
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return data >> (8*n);
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}
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static inline void __indirect_readsb(const volatile void __iomem *bus_addr,
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void *p, u32 count)
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{
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u8 *vaddr = p;
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while (count--)
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*vaddr++ = readb(bus_addr);
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}
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static inline u16 __indirect_readw(const volatile void __iomem *p)
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{
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u32 addr = (u32)p;
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u32 n, byte_enables, data;
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if (!is_pci_memory(addr))
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return __raw_readw(p);
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n = addr % 4;
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byte_enables = (0xf & ~(BIT(n) | BIT(n+1))) << IXP4XX_PCI_NP_CBE_BESL;
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if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_MEMREAD, &data))
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return 0xffff;
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return data>>(8*n);
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}
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static inline void __indirect_readsw(const volatile void __iomem *bus_addr,
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void *p, u32 count)
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{
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u16 *vaddr = p;
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while (count--)
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*vaddr++ = readw(bus_addr);
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}
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static inline u32 __indirect_readl(const volatile void __iomem *p)
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{
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u32 addr = (__force u32)p;
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u32 data;
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if (!is_pci_memory(addr))
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return __raw_readl(p);
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if (ixp4xx_pci_read(addr, NP_CMD_MEMREAD, &data))
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return 0xffffffff;
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return data;
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}
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static inline void __indirect_readsl(const volatile void __iomem *bus_addr,
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void *p, u32 count)
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{
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u32 *vaddr = p;
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while (count--)
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*vaddr++ = readl(bus_addr);
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}
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/*
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* We can use the built-in functions b/c they end up calling writeb/readb
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*/
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#define memset_io(c,v,l) _memset_io((c),(v),(l))
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#define memcpy_fromio(a,c,l) _memcpy_fromio((a),(c),(l))
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#define memcpy_toio(c,a,l) _memcpy_toio((c),(a),(l))
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#endif /* CONFIG_IXP4XX_INDIRECT_PCI */
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#ifndef CONFIG_PCI
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#define __io(v) __typesafe_io(v)
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#else
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/*
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* IXP4xx does not have a transparent cpu -> PCI I/O translation
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* window. Instead, it has a set of registers that must be tweaked
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* with the proper byte lanes, command types, and address for the
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* transaction. This means that we need to override the default
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* I/O functions.
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*/
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#define outb outb
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static inline void outb(u8 value, u32 addr)
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{
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u32 n, byte_enables, data;
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n = addr % 4;
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byte_enables = (0xf & ~BIT(n)) << IXP4XX_PCI_NP_CBE_BESL;
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data = value << (8*n);
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ixp4xx_pci_write(addr, byte_enables | NP_CMD_IOWRITE, data);
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}
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#define outsb outsb
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static inline void outsb(u32 io_addr, const void *p, u32 count)
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{
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const u8 *vaddr = p;
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while (count--)
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outb(*vaddr++, io_addr);
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}
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#define outw outw
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static inline void outw(u16 value, u32 addr)
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{
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u32 n, byte_enables, data;
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n = addr % 4;
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byte_enables = (0xf & ~(BIT(n) | BIT(n+1))) << IXP4XX_PCI_NP_CBE_BESL;
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data = value << (8*n);
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ixp4xx_pci_write(addr, byte_enables | NP_CMD_IOWRITE, data);
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}
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#define outsw outsw
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static inline void outsw(u32 io_addr, const void *p, u32 count)
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{
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const u16 *vaddr = p;
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while (count--)
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outw(cpu_to_le16(*vaddr++), io_addr);
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}
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#define outl outl
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static inline void outl(u32 value, u32 addr)
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{
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ixp4xx_pci_write(addr, NP_CMD_IOWRITE, value);
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}
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#define outsl outsl
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static inline void outsl(u32 io_addr, const void *p, u32 count)
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{
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const u32 *vaddr = p;
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while (count--)
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outl(cpu_to_le32(*vaddr++), io_addr);
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}
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#define inb inb
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static inline u8 inb(u32 addr)
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{
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u32 n, byte_enables, data;
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n = addr % 4;
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byte_enables = (0xf & ~BIT(n)) << IXP4XX_PCI_NP_CBE_BESL;
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if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_IOREAD, &data))
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return 0xff;
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return data >> (8*n);
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}
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#define insb insb
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static inline void insb(u32 io_addr, void *p, u32 count)
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{
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u8 *vaddr = p;
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while (count--)
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*vaddr++ = inb(io_addr);
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}
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#define inw inw
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static inline u16 inw(u32 addr)
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{
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u32 n, byte_enables, data;
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n = addr % 4;
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byte_enables = (0xf & ~(BIT(n) | BIT(n+1))) << IXP4XX_PCI_NP_CBE_BESL;
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if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_IOREAD, &data))
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return 0xffff;
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return data>>(8*n);
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}
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#define insw insw
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static inline void insw(u32 io_addr, void *p, u32 count)
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{
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u16 *vaddr = p;
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while (count--)
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*vaddr++ = le16_to_cpu(inw(io_addr));
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}
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#define inl inl
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static inline u32 inl(u32 addr)
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{
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u32 data;
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if (ixp4xx_pci_read(addr, NP_CMD_IOREAD, &data))
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return 0xffffffff;
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return data;
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}
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#define insl insl
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static inline void insl(u32 io_addr, void *p, u32 count)
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{
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u32 *vaddr = p;
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while (count--)
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*vaddr++ = le32_to_cpu(inl(io_addr));
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}
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#define PIO_OFFSET 0x10000UL
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#define PIO_MASK 0x0ffffUL
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#define __is_io_address(p) (((unsigned long)p >= PIO_OFFSET) && \
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((unsigned long)p <= (PIO_MASK + PIO_OFFSET)))
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#define ioread8(p) ioread8(p)
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static inline u8 ioread8(const void __iomem *addr)
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{
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unsigned long port = (unsigned long __force)addr;
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if (__is_io_address(port))
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return (unsigned int)inb(port & PIO_MASK);
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else
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#ifndef CONFIG_IXP4XX_INDIRECT_PCI
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return (unsigned int)__raw_readb(addr);
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#else
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return (unsigned int)__indirect_readb(addr);
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#endif
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}
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#define ioread8_rep(p, v, c) ioread8_rep(p, v, c)
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static inline void ioread8_rep(const void __iomem *addr, void *vaddr, u32 count)
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{
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unsigned long port = (unsigned long __force)addr;
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if (__is_io_address(port))
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insb(port & PIO_MASK, vaddr, count);
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else
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#ifndef CONFIG_IXP4XX_INDIRECT_PCI
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__raw_readsb(addr, vaddr, count);
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#else
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__indirect_readsb(addr, vaddr, count);
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#endif
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}
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#define ioread16(p) ioread16(p)
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static inline u16 ioread16(const void __iomem *addr)
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{
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unsigned long port = (unsigned long __force)addr;
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if (__is_io_address(port))
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return (unsigned int)inw(port & PIO_MASK);
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else
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#ifndef CONFIG_IXP4XX_INDIRECT_PCI
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return le16_to_cpu((__force __le16)__raw_readw(addr));
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#else
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return (unsigned int)__indirect_readw(addr);
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#endif
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}
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#define ioread16_rep(p, v, c) ioread16_rep(p, v, c)
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static inline void ioread16_rep(const void __iomem *addr, void *vaddr,
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u32 count)
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{
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unsigned long port = (unsigned long __force)addr;
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if (__is_io_address(port))
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insw(port & PIO_MASK, vaddr, count);
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else
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#ifndef CONFIG_IXP4XX_INDIRECT_PCI
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__raw_readsw(addr, vaddr, count);
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#else
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__indirect_readsw(addr, vaddr, count);
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#endif
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}
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#define ioread32(p) ioread32(p)
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static inline u32 ioread32(const void __iomem *addr)
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{
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unsigned long port = (unsigned long __force)addr;
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if (__is_io_address(port))
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return (unsigned int)inl(port & PIO_MASK);
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else {
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#ifndef CONFIG_IXP4XX_INDIRECT_PCI
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return le32_to_cpu((__force __le32)__raw_readl(addr));
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#else
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return (unsigned int)__indirect_readl(addr);
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#endif
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}
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}
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#define ioread32_rep(p, v, c) ioread32_rep(p, v, c)
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static inline void ioread32_rep(const void __iomem *addr, void *vaddr,
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u32 count)
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{
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unsigned long port = (unsigned long __force)addr;
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if (__is_io_address(port))
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insl(port & PIO_MASK, vaddr, count);
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else
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#ifndef CONFIG_IXP4XX_INDIRECT_PCI
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__raw_readsl(addr, vaddr, count);
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#else
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__indirect_readsl(addr, vaddr, count);
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#endif
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}
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#define iowrite8(v, p) iowrite8(v, p)
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static inline void iowrite8(u8 value, void __iomem *addr)
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{
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unsigned long port = (unsigned long __force)addr;
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if (__is_io_address(port))
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outb(value, port & PIO_MASK);
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else
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#ifndef CONFIG_IXP4XX_INDIRECT_PCI
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__raw_writeb(value, addr);
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#else
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__indirect_writeb(value, addr);
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#endif
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}
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#define iowrite8_rep(p, v, c) iowrite8_rep(p, v, c)
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static inline void iowrite8_rep(void __iomem *addr, const void *vaddr,
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u32 count)
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{
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unsigned long port = (unsigned long __force)addr;
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if (__is_io_address(port))
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outsb(port & PIO_MASK, vaddr, count);
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else
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#ifndef CONFIG_IXP4XX_INDIRECT_PCI
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__raw_writesb(addr, vaddr, count);
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#else
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__indirect_writesb(addr, vaddr, count);
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#endif
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}
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#define iowrite16(v, p) iowrite16(v, p)
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static inline void iowrite16(u16 value, void __iomem *addr)
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{
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unsigned long port = (unsigned long __force)addr;
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if (__is_io_address(port))
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outw(value, port & PIO_MASK);
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else
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#ifndef CONFIG_IXP4XX_INDIRECT_PCI
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__raw_writew(cpu_to_le16(value), addr);
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#else
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__indirect_writew(value, addr);
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#endif
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}
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#define iowrite16_rep(p, v, c) iowrite16_rep(p, v, c)
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static inline void iowrite16_rep(void __iomem *addr, const void *vaddr,
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u32 count)
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{
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unsigned long port = (unsigned long __force)addr;
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if (__is_io_address(port))
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outsw(port & PIO_MASK, vaddr, count);
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else
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#ifndef CONFIG_IXP4XX_INDIRECT_PCI
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__raw_writesw(addr, vaddr, count);
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#else
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__indirect_writesw(addr, vaddr, count);
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#endif
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}
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#define iowrite32(v, p) iowrite32(v, p)
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static inline void iowrite32(u32 value, void __iomem *addr)
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{
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unsigned long port = (unsigned long __force)addr;
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if (__is_io_address(port))
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outl(value, port & PIO_MASK);
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else
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#ifndef CONFIG_IXP4XX_INDIRECT_PCI
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__raw_writel((u32 __force)cpu_to_le32(value), addr);
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#else
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__indirect_writel(value, addr);
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#endif
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}
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#define iowrite32_rep(p, v, c) iowrite32_rep(p, v, c)
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static inline void iowrite32_rep(void __iomem *addr, const void *vaddr,
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u32 count)
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|
{
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|
unsigned long port = (unsigned long __force)addr;
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|
if (__is_io_address(port))
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outsl(port & PIO_MASK, vaddr, count);
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else
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#ifndef CONFIG_IXP4XX_INDIRECT_PCI
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__raw_writesl(addr, vaddr, count);
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#else
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__indirect_writesl(addr, vaddr, count);
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#endif
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}
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#define ioport_map(port, nr) ioport_map(port, nr)
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static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
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{
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return ((void __iomem*)((port) + PIO_OFFSET));
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}
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#define ioport_unmap(addr) ioport_unmap(addr)
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|
static inline void ioport_unmap(void __iomem *addr)
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{
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}
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#endif /* CONFIG_PCI */
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#endif /* __ASM_ARM_ARCH_IO_H */
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