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Diffstat (limited to 'include/asm-arm/arch-ixp4xx/io.h')
| -rw-r--r-- | include/asm-arm/arch-ixp4xx/io.h | 388 |
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 0000000..c27b9d3 --- /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 + |