diff options
Diffstat (limited to 'include/asm-arm/arch-ixp2000/io.h')
| -rw-r--r-- | include/asm-arm/arch-ixp2000/io.h | 96 |
1 files changed, 88 insertions, 8 deletions
diff --git a/include/asm-arm/arch-ixp2000/io.h b/include/asm-arm/arch-ixp2000/io.h index 083462668e1..3241cd6f077 100644 --- a/include/asm-arm/arch-ixp2000/io.h +++ b/include/asm-arm/arch-ixp2000/io.h @@ -17,18 +17,23 @@ #define IO_SPACE_LIMIT 0xffffffff #define __mem_pci(a) (a) -#define ___io(p) ((void __iomem *)((p)+IXP2000_PCI_IO_VIRT_BASE)) /* - * The IXP2400 before revision B0 asserts byte lanes for PCI I/O + * The A? revisions of the IXP2000s assert byte lanes for PCI I/O * transactions the other way round (MEM transactions don't have this - * issue), so we need to override the standard functions. B0 and later - * have a bit that can be set to 1 to get the 'proper' behavior, but - * since that isn't available on the A? revisions we just keep doing - * things manually. + * issue), so if we want to support those models, we need to override + * the standard I/O functions. + * + * B0 and later have a bit that can be set to 1 to get the proper + * behavior for I/O transactions, which then allows us to use the + * standard I/O functions. This is what we do if the user does not + * explicitly ask for support for pre-B0. */ -#define alignb(addr) (void __iomem *)((unsigned long)addr ^ 3) -#define alignw(addr) (void __iomem *)((unsigned long)addr ^ 2) +#ifdef CONFIG_IXP2000_SUPPORT_BROKEN_PCI_IO +#define ___io(p) ((void __iomem *)((p)+IXP2000_PCI_IO_VIRT_BASE)) + +#define alignb(addr) (void __iomem *)((unsigned long)(addr) ^ 3) +#define alignw(addr) (void __iomem *)((unsigned long)(addr) ^ 2) #define outb(v,p) __raw_writeb((v),alignb(___io(p))) #define outw(v,p) __raw_writew((v),alignw(___io(p))) @@ -48,6 +53,81 @@ #define insw(p,d,l) __raw_readsw(alignw(___io(p)),d,l) #define insl(p,d,l) __raw_readsl(___io(p),d,l) +#define __is_io_address(p) ((((unsigned long)(p)) & ~(IXP2000_PCI_IO_SIZE - 1)) == IXP2000_PCI_IO_VIRT_BASE) + +#define ioread8(p) \ + ({ \ + unsigned int __v; \ + \ + if (__is_io_address(p)) { \ + __v = __raw_readb(alignb(p)); \ + } else { \ + __v = __raw_readb(p); \ + } \ + \ + __v; \ + }) \ + +#define ioread16(p) \ + ({ \ + unsigned int __v; \ + \ + if (__is_io_address(p)) { \ + __v = __raw_readw(alignw(p)); \ + } else { \ + __v = le16_to_cpu(__raw_readw(p)); \ + } \ + \ + __v; \ + }) + +#define ioread32(p) \ + ({ \ + unsigned int __v; \ + \ + if (__is_io_address(p)) { \ + __v = __raw_readl(p); \ + } else { \ + __v = le32_to_cpu(__raw_readl(p)); \ + } \ + \ + __v; \ + }) + +#define iowrite8(v,p) \ + ({ \ + if (__is_io_address(p)) { \ + __raw_writeb((v), alignb(p)); \ + } else { \ + __raw_writeb((v), p); \ + } \ + }) + +#define iowrite16(v,p) \ + ({ \ + if (__is_io_address(p)) { \ + __raw_writew((v), alignw(p)); \ + } else { \ + __raw_writew(cpu_to_le16(v), p); \ + } \ + }) + +#define iowrite32(v,p) \ + ({ \ + if (__is_io_address(p)) { \ + __raw_writel((v), p); \ + } else { \ + __raw_writel(cpu_to_le32(v), p); \ + } \ + }) + +#define ioport_map(port, nr) ___io(port) + +#define ioport_unmap(addr) +#else +#define __io(p) ((void __iomem *)((p)+IXP2000_PCI_IO_VIRT_BASE)) +#endif + #ifdef CONFIG_ARCH_IXDP2X01 /* |