diff options
Diffstat (limited to 'arch/alpha/kernel/io.c')
| -rw-r--r-- | arch/alpha/kernel/io.c | 677 |
1 files changed, 677 insertions, 0 deletions
diff --git a/arch/alpha/kernel/io.c b/arch/alpha/kernel/io.c new file mode 100644 index 000000000..938de13ad --- /dev/null +++ b/arch/alpha/kernel/io.c @@ -0,0 +1,677 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Alpha IO and memory functions. + */ + +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/string.h> +#include <linux/module.h> +#include <asm/io.h> + +/* Out-of-line versions of the i/o routines that redirect into the + platform-specific version. Note that "platform-specific" may mean + "generic", which bumps through the machine vector. */ + +unsigned int +ioread8(void __iomem *addr) +{ + unsigned int ret; + mb(); + ret = IO_CONCAT(__IO_PREFIX,ioread8)(addr); + mb(); + return ret; +} + +unsigned int ioread16(void __iomem *addr) +{ + unsigned int ret; + mb(); + ret = IO_CONCAT(__IO_PREFIX,ioread16)(addr); + mb(); + return ret; +} + +unsigned int ioread32(void __iomem *addr) +{ + unsigned int ret; + mb(); + ret = IO_CONCAT(__IO_PREFIX,ioread32)(addr); + mb(); + return ret; +} + +void iowrite8(u8 b, void __iomem *addr) +{ + mb(); + IO_CONCAT(__IO_PREFIX,iowrite8)(b, addr); +} + +void iowrite16(u16 b, void __iomem *addr) +{ + mb(); + IO_CONCAT(__IO_PREFIX,iowrite16)(b, addr); +} + +void iowrite32(u32 b, void __iomem *addr) +{ + mb(); + IO_CONCAT(__IO_PREFIX,iowrite32)(b, addr); +} + +EXPORT_SYMBOL(ioread8); +EXPORT_SYMBOL(ioread16); +EXPORT_SYMBOL(ioread32); +EXPORT_SYMBOL(iowrite8); +EXPORT_SYMBOL(iowrite16); +EXPORT_SYMBOL(iowrite32); + +u8 inb(unsigned long port) +{ + return ioread8(ioport_map(port, 1)); +} + +u16 inw(unsigned long port) +{ + return ioread16(ioport_map(port, 2)); +} + +u32 inl(unsigned long port) +{ + return ioread32(ioport_map(port, 4)); +} + +void outb(u8 b, unsigned long port) +{ + iowrite8(b, ioport_map(port, 1)); +} + +void outw(u16 b, unsigned long port) +{ + iowrite16(b, ioport_map(port, 2)); +} + +void outl(u32 b, unsigned long port) +{ + iowrite32(b, ioport_map(port, 4)); +} + +EXPORT_SYMBOL(inb); +EXPORT_SYMBOL(inw); +EXPORT_SYMBOL(inl); +EXPORT_SYMBOL(outb); +EXPORT_SYMBOL(outw); +EXPORT_SYMBOL(outl); + +u8 __raw_readb(const volatile void __iomem *addr) +{ + return IO_CONCAT(__IO_PREFIX,readb)(addr); +} + +u16 __raw_readw(const volatile void __iomem *addr) +{ + return IO_CONCAT(__IO_PREFIX,readw)(addr); +} + +u32 __raw_readl(const volatile void __iomem *addr) +{ + return IO_CONCAT(__IO_PREFIX,readl)(addr); +} + +u64 __raw_readq(const volatile void __iomem *addr) +{ + return IO_CONCAT(__IO_PREFIX,readq)(addr); +} + +void __raw_writeb(u8 b, volatile void __iomem *addr) +{ + IO_CONCAT(__IO_PREFIX,writeb)(b, addr); +} + +void __raw_writew(u16 b, volatile void __iomem *addr) +{ + IO_CONCAT(__IO_PREFIX,writew)(b, addr); +} + +void __raw_writel(u32 b, volatile void __iomem *addr) +{ + IO_CONCAT(__IO_PREFIX,writel)(b, addr); +} + +void __raw_writeq(u64 b, volatile void __iomem *addr) +{ + IO_CONCAT(__IO_PREFIX,writeq)(b, addr); +} + +EXPORT_SYMBOL(__raw_readb); +EXPORT_SYMBOL(__raw_readw); +EXPORT_SYMBOL(__raw_readl); +EXPORT_SYMBOL(__raw_readq); +EXPORT_SYMBOL(__raw_writeb); +EXPORT_SYMBOL(__raw_writew); +EXPORT_SYMBOL(__raw_writel); +EXPORT_SYMBOL(__raw_writeq); + +u8 readb(const volatile void __iomem *addr) +{ + u8 ret; + mb(); + ret = __raw_readb(addr); + mb(); + return ret; +} + +u16 readw(const volatile void __iomem *addr) +{ + u16 ret; + mb(); + ret = __raw_readw(addr); + mb(); + return ret; +} + +u32 readl(const volatile void __iomem *addr) +{ + u32 ret; + mb(); + ret = __raw_readl(addr); + mb(); + return ret; +} + +u64 readq(const volatile void __iomem *addr) +{ + u64 ret; + mb(); + ret = __raw_readq(addr); + mb(); + return ret; +} + +void writeb(u8 b, volatile void __iomem *addr) +{ + mb(); + __raw_writeb(b, addr); +} + +void writew(u16 b, volatile void __iomem *addr) +{ + mb(); + __raw_writew(b, addr); +} + +void writel(u32 b, volatile void __iomem *addr) +{ + mb(); + __raw_writel(b, addr); +} + +void writeq(u64 b, volatile void __iomem *addr) +{ + mb(); + __raw_writeq(b, addr); +} + +EXPORT_SYMBOL(readb); +EXPORT_SYMBOL(readw); +EXPORT_SYMBOL(readl); +EXPORT_SYMBOL(readq); +EXPORT_SYMBOL(writeb); +EXPORT_SYMBOL(writew); +EXPORT_SYMBOL(writel); +EXPORT_SYMBOL(writeq); + +/* + * The _relaxed functions must be ordered w.r.t. each other, but they don't + * have to be ordered w.r.t. other memory accesses. + */ +u8 readb_relaxed(const volatile void __iomem *addr) +{ + mb(); + return __raw_readb(addr); +} + +u16 readw_relaxed(const volatile void __iomem *addr) +{ + mb(); + return __raw_readw(addr); +} + +u32 readl_relaxed(const volatile void __iomem *addr) +{ + mb(); + return __raw_readl(addr); +} + +u64 readq_relaxed(const volatile void __iomem *addr) +{ + mb(); + return __raw_readq(addr); +} + +EXPORT_SYMBOL(readb_relaxed); +EXPORT_SYMBOL(readw_relaxed); +EXPORT_SYMBOL(readl_relaxed); +EXPORT_SYMBOL(readq_relaxed); + +/* + * Read COUNT 8-bit bytes from port PORT into memory starting at SRC. + */ +void ioread8_rep(void __iomem *port, void *dst, unsigned long count) +{ + while ((unsigned long)dst & 0x3) { + if (!count) + return; + count--; + *(unsigned char *)dst = ioread8(port); + dst += 1; + } + + while (count >= 4) { + unsigned int w; + count -= 4; + w = ioread8(port); + w |= ioread8(port) << 8; + w |= ioread8(port) << 16; + w |= ioread8(port) << 24; + *(unsigned int *)dst = w; + dst += 4; + } + + while (count) { + --count; + *(unsigned char *)dst = ioread8(port); + dst += 1; + } +} + +void insb(unsigned long port, void *dst, unsigned long count) +{ + ioread8_rep(ioport_map(port, 1), dst, count); +} + +EXPORT_SYMBOL(ioread8_rep); +EXPORT_SYMBOL(insb); + +/* + * Read COUNT 16-bit words from port PORT into memory starting at + * SRC. SRC must be at least short aligned. This is used by the + * IDE driver to read disk sectors. Performance is important, but + * the interfaces seems to be slow: just using the inlined version + * of the inw() breaks things. + */ +void ioread16_rep(void __iomem *port, void *dst, unsigned long count) +{ + if (unlikely((unsigned long)dst & 0x3)) { + if (!count) + return; + BUG_ON((unsigned long)dst & 0x1); + count--; + *(unsigned short *)dst = ioread16(port); + dst += 2; + } + + while (count >= 2) { + unsigned int w; + count -= 2; + w = ioread16(port); + w |= ioread16(port) << 16; + *(unsigned int *)dst = w; + dst += 4; + } + + if (count) { + *(unsigned short*)dst = ioread16(port); + } +} + +void insw(unsigned long port, void *dst, unsigned long count) +{ + ioread16_rep(ioport_map(port, 2), dst, count); +} + +EXPORT_SYMBOL(ioread16_rep); +EXPORT_SYMBOL(insw); + + +/* + * Read COUNT 32-bit words from port PORT into memory starting at + * SRC. Now works with any alignment in SRC. Performance is important, + * but the interfaces seems to be slow: just using the inlined version + * of the inl() breaks things. + */ +void ioread32_rep(void __iomem *port, void *dst, unsigned long count) +{ + if (unlikely((unsigned long)dst & 0x3)) { + while (count--) { + struct S { int x __attribute__((packed)); }; + ((struct S *)dst)->x = ioread32(port); + dst += 4; + } + } else { + /* Buffer 32-bit aligned. */ + while (count--) { + *(unsigned int *)dst = ioread32(port); + dst += 4; + } + } +} + +void insl(unsigned long port, void *dst, unsigned long count) +{ + ioread32_rep(ioport_map(port, 4), dst, count); +} + +EXPORT_SYMBOL(ioread32_rep); +EXPORT_SYMBOL(insl); + + +/* + * Like insb but in the opposite direction. + * Don't worry as much about doing aligned memory transfers: + * doing byte reads the "slow" way isn't nearly as slow as + * doing byte writes the slow way (no r-m-w cycle). + */ +void iowrite8_rep(void __iomem *port, const void *xsrc, unsigned long count) +{ + const unsigned char *src = xsrc; + while (count--) + iowrite8(*src++, port); +} + +void outsb(unsigned long port, const void *src, unsigned long count) +{ + iowrite8_rep(ioport_map(port, 1), src, count); +} + +EXPORT_SYMBOL(iowrite8_rep); +EXPORT_SYMBOL(outsb); + + +/* + * Like insw but in the opposite direction. This is used by the IDE + * driver to write disk sectors. Performance is important, but the + * interfaces seems to be slow: just using the inlined version of the + * outw() breaks things. + */ +void iowrite16_rep(void __iomem *port, const void *src, unsigned long count) +{ + if (unlikely((unsigned long)src & 0x3)) { + if (!count) + return; + BUG_ON((unsigned long)src & 0x1); + iowrite16(*(unsigned short *)src, port); + src += 2; + --count; + } + + while (count >= 2) { + unsigned int w; + count -= 2; + w = *(unsigned int *)src; + src += 4; + iowrite16(w >> 0, port); + iowrite16(w >> 16, port); + } + + if (count) { + iowrite16(*(unsigned short *)src, port); + } +} + +void outsw(unsigned long port, const void *src, unsigned long count) +{ + iowrite16_rep(ioport_map(port, 2), src, count); +} + +EXPORT_SYMBOL(iowrite16_rep); +EXPORT_SYMBOL(outsw); + + +/* + * Like insl but in the opposite direction. This is used by the IDE + * driver to write disk sectors. Works with any alignment in SRC. + * Performance is important, but the interfaces seems to be slow: + * just using the inlined version of the outl() breaks things. + */ +void iowrite32_rep(void __iomem *port, const void *src, unsigned long count) +{ + if (unlikely((unsigned long)src & 0x3)) { + while (count--) { + struct S { int x __attribute__((packed)); }; + iowrite32(((struct S *)src)->x, port); + src += 4; + } + } else { + /* Buffer 32-bit aligned. */ + while (count--) { + iowrite32(*(unsigned int *)src, port); + src += 4; + } + } +} + +void outsl(unsigned long port, const void *src, unsigned long count) +{ + iowrite32_rep(ioport_map(port, 4), src, count); +} + +EXPORT_SYMBOL(iowrite32_rep); +EXPORT_SYMBOL(outsl); + + +/* + * Copy data from IO memory space to "real" memory space. + * This needs to be optimized. + */ +void memcpy_fromio(void *to, const volatile void __iomem *from, long count) +{ + /* Optimize co-aligned transfers. Everything else gets handled + a byte at a time. */ + + if (count >= 8 && ((u64)to & 7) == ((u64)from & 7)) { + count -= 8; + do { + *(u64 *)to = __raw_readq(from); + count -= 8; + to += 8; + from += 8; + } while (count >= 0); + count += 8; + } + + if (count >= 4 && ((u64)to & 3) == ((u64)from & 3)) { + count -= 4; + do { + *(u32 *)to = __raw_readl(from); + count -= 4; + to += 4; + from += 4; + } while (count >= 0); + count += 4; + } + + if (count >= 2 && ((u64)to & 1) == ((u64)from & 1)) { + count -= 2; + do { + *(u16 *)to = __raw_readw(from); + count -= 2; + to += 2; + from += 2; + } while (count >= 0); + count += 2; + } + + while (count > 0) { + *(u8 *) to = __raw_readb(from); + count--; + to++; + from++; + } + mb(); +} + +EXPORT_SYMBOL(memcpy_fromio); + + +/* + * Copy data from "real" memory space to IO memory space. + * This needs to be optimized. + */ +void memcpy_toio(volatile void __iomem *to, const void *from, long count) +{ + /* Optimize co-aligned transfers. Everything else gets handled + a byte at a time. */ + /* FIXME -- align FROM. */ + + if (count >= 8 && ((u64)to & 7) == ((u64)from & 7)) { + count -= 8; + do { + __raw_writeq(*(const u64 *)from, to); + count -= 8; + to += 8; + from += 8; + } while (count >= 0); + count += 8; + } + + if (count >= 4 && ((u64)to & 3) == ((u64)from & 3)) { + count -= 4; + do { + __raw_writel(*(const u32 *)from, to); + count -= 4; + to += 4; + from += 4; + } while (count >= 0); + count += 4; + } + + if (count >= 2 && ((u64)to & 1) == ((u64)from & 1)) { + count -= 2; + do { + __raw_writew(*(const u16 *)from, to); + count -= 2; + to += 2; + from += 2; + } while (count >= 0); + count += 2; + } + + while (count > 0) { + __raw_writeb(*(const u8 *) from, to); + count--; + to++; + from++; + } + mb(); +} + +EXPORT_SYMBOL(memcpy_toio); + + +/* + * "memset" on IO memory space. + */ +void _memset_c_io(volatile void __iomem *to, unsigned long c, long count) +{ + /* Handle any initial odd byte */ + if (count > 0 && ((u64)to & 1)) { + __raw_writeb(c, to); + to++; + count--; + } + + /* Handle any initial odd halfword */ + if (count >= 2 && ((u64)to & 2)) { + __raw_writew(c, to); + to += 2; + count -= 2; + } + + /* Handle any initial odd word */ + if (count >= 4 && ((u64)to & 4)) { + __raw_writel(c, to); + to += 4; + count -= 4; + } + + /* Handle all full-sized quadwords: we're aligned + (or have a small count) */ + count -= 8; + if (count >= 0) { + do { + __raw_writeq(c, to); + to += 8; + count -= 8; + } while (count >= 0); + } + count += 8; + + /* The tail is word-aligned if we still have count >= 4 */ + if (count >= 4) { + __raw_writel(c, to); + to += 4; + count -= 4; + } + + /* The tail is half-word aligned if we have count >= 2 */ + if (count >= 2) { + __raw_writew(c, to); + to += 2; + count -= 2; + } + + /* And finally, one last byte.. */ + if (count) { + __raw_writeb(c, to); + } + mb(); +} + +EXPORT_SYMBOL(_memset_c_io); + +/* A version of memcpy used by the vga console routines to move data around + arbitrarily between screen and main memory. */ + +void +scr_memcpyw(u16 *d, const u16 *s, unsigned int count) +{ + const u16 __iomem *ios = (const u16 __iomem *) s; + u16 __iomem *iod = (u16 __iomem *) d; + int s_isio = __is_ioaddr(s); + int d_isio = __is_ioaddr(d); + + if (s_isio) { + if (d_isio) { + /* FIXME: Should handle unaligned ops and + operation widening. */ + + count /= 2; + while (count--) { + u16 tmp = __raw_readw(ios++); + __raw_writew(tmp, iod++); + } + } + else + memcpy_fromio(d, ios, count); + } else { + if (d_isio) + memcpy_toio(iod, s, count); + else + memcpy(d, s, count); + } +} + +EXPORT_SYMBOL(scr_memcpyw); + +void __iomem *ioport_map(unsigned long port, unsigned int size) +{ + return IO_CONCAT(__IO_PREFIX,ioportmap) (port); +} + +void ioport_unmap(void __iomem *addr) +{ +} + +EXPORT_SYMBOL(ioport_map); +EXPORT_SYMBOL(ioport_unmap); |