678 lines
13 KiB
C
678 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Alpha IO and memory functions.
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/module.h>
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#include <asm/io.h>
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/* Out-of-line versions of the i/o routines that redirect into the
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platform-specific version. Note that "platform-specific" may mean
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"generic", which bumps through the machine vector. */
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unsigned int
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ioread8(void __iomem *addr)
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{
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unsigned int ret;
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mb();
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ret = IO_CONCAT(__IO_PREFIX,ioread8)(addr);
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mb();
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return ret;
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}
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unsigned int ioread16(void __iomem *addr)
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{
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unsigned int ret;
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mb();
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ret = IO_CONCAT(__IO_PREFIX,ioread16)(addr);
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mb();
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return ret;
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}
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unsigned int ioread32(void __iomem *addr)
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{
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unsigned int ret;
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mb();
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ret = IO_CONCAT(__IO_PREFIX,ioread32)(addr);
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mb();
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return ret;
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}
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void iowrite8(u8 b, void __iomem *addr)
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{
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mb();
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IO_CONCAT(__IO_PREFIX,iowrite8)(b, addr);
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}
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void iowrite16(u16 b, void __iomem *addr)
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{
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mb();
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IO_CONCAT(__IO_PREFIX,iowrite16)(b, addr);
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}
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void iowrite32(u32 b, void __iomem *addr)
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{
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mb();
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IO_CONCAT(__IO_PREFIX,iowrite32)(b, addr);
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}
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EXPORT_SYMBOL(ioread8);
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EXPORT_SYMBOL(ioread16);
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EXPORT_SYMBOL(ioread32);
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EXPORT_SYMBOL(iowrite8);
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EXPORT_SYMBOL(iowrite16);
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EXPORT_SYMBOL(iowrite32);
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u8 inb(unsigned long port)
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{
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return ioread8(ioport_map(port, 1));
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}
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u16 inw(unsigned long port)
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{
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return ioread16(ioport_map(port, 2));
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}
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u32 inl(unsigned long port)
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{
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return ioread32(ioport_map(port, 4));
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}
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void outb(u8 b, unsigned long port)
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{
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iowrite8(b, ioport_map(port, 1));
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}
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void outw(u16 b, unsigned long port)
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{
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iowrite16(b, ioport_map(port, 2));
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}
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void outl(u32 b, unsigned long port)
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{
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iowrite32(b, ioport_map(port, 4));
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}
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EXPORT_SYMBOL(inb);
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EXPORT_SYMBOL(inw);
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EXPORT_SYMBOL(inl);
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EXPORT_SYMBOL(outb);
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EXPORT_SYMBOL(outw);
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EXPORT_SYMBOL(outl);
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u8 __raw_readb(const volatile void __iomem *addr)
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{
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return IO_CONCAT(__IO_PREFIX,readb)(addr);
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}
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u16 __raw_readw(const volatile void __iomem *addr)
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{
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return IO_CONCAT(__IO_PREFIX,readw)(addr);
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}
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u32 __raw_readl(const volatile void __iomem *addr)
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{
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return IO_CONCAT(__IO_PREFIX,readl)(addr);
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}
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u64 __raw_readq(const volatile void __iomem *addr)
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{
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return IO_CONCAT(__IO_PREFIX,readq)(addr);
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}
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void __raw_writeb(u8 b, volatile void __iomem *addr)
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{
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IO_CONCAT(__IO_PREFIX,writeb)(b, addr);
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}
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void __raw_writew(u16 b, volatile void __iomem *addr)
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{
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IO_CONCAT(__IO_PREFIX,writew)(b, addr);
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}
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void __raw_writel(u32 b, volatile void __iomem *addr)
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{
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IO_CONCAT(__IO_PREFIX,writel)(b, addr);
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}
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void __raw_writeq(u64 b, volatile void __iomem *addr)
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{
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IO_CONCAT(__IO_PREFIX,writeq)(b, addr);
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}
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EXPORT_SYMBOL(__raw_readb);
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EXPORT_SYMBOL(__raw_readw);
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EXPORT_SYMBOL(__raw_readl);
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EXPORT_SYMBOL(__raw_readq);
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EXPORT_SYMBOL(__raw_writeb);
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EXPORT_SYMBOL(__raw_writew);
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EXPORT_SYMBOL(__raw_writel);
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EXPORT_SYMBOL(__raw_writeq);
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u8 readb(const volatile void __iomem *addr)
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{
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u8 ret;
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mb();
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ret = __raw_readb(addr);
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mb();
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return ret;
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}
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u16 readw(const volatile void __iomem *addr)
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{
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u16 ret;
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mb();
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ret = __raw_readw(addr);
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mb();
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return ret;
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}
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u32 readl(const volatile void __iomem *addr)
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{
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u32 ret;
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mb();
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ret = __raw_readl(addr);
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mb();
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return ret;
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}
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u64 readq(const volatile void __iomem *addr)
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{
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u64 ret;
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mb();
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ret = __raw_readq(addr);
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mb();
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return ret;
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}
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void writeb(u8 b, volatile void __iomem *addr)
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{
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mb();
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__raw_writeb(b, addr);
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}
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void writew(u16 b, volatile void __iomem *addr)
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{
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mb();
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__raw_writew(b, addr);
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}
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void writel(u32 b, volatile void __iomem *addr)
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{
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mb();
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__raw_writel(b, addr);
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}
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void writeq(u64 b, volatile void __iomem *addr)
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{
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mb();
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__raw_writeq(b, addr);
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}
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EXPORT_SYMBOL(readb);
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EXPORT_SYMBOL(readw);
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EXPORT_SYMBOL(readl);
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EXPORT_SYMBOL(readq);
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EXPORT_SYMBOL(writeb);
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EXPORT_SYMBOL(writew);
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EXPORT_SYMBOL(writel);
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EXPORT_SYMBOL(writeq);
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/*
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* The _relaxed functions must be ordered w.r.t. each other, but they don't
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* have to be ordered w.r.t. other memory accesses.
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*/
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u8 readb_relaxed(const volatile void __iomem *addr)
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{
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mb();
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return __raw_readb(addr);
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}
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u16 readw_relaxed(const volatile void __iomem *addr)
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{
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mb();
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return __raw_readw(addr);
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}
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u32 readl_relaxed(const volatile void __iomem *addr)
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{
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mb();
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return __raw_readl(addr);
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}
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u64 readq_relaxed(const volatile void __iomem *addr)
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{
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mb();
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return __raw_readq(addr);
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}
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EXPORT_SYMBOL(readb_relaxed);
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EXPORT_SYMBOL(readw_relaxed);
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EXPORT_SYMBOL(readl_relaxed);
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EXPORT_SYMBOL(readq_relaxed);
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/*
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* Read COUNT 8-bit bytes from port PORT into memory starting at SRC.
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*/
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void ioread8_rep(void __iomem *port, void *dst, unsigned long count)
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{
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while ((unsigned long)dst & 0x3) {
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if (!count)
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return;
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count--;
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*(unsigned char *)dst = ioread8(port);
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dst += 1;
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}
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while (count >= 4) {
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unsigned int w;
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count -= 4;
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w = ioread8(port);
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w |= ioread8(port) << 8;
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w |= ioread8(port) << 16;
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w |= ioread8(port) << 24;
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*(unsigned int *)dst = w;
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dst += 4;
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}
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while (count) {
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--count;
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*(unsigned char *)dst = ioread8(port);
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dst += 1;
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}
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}
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void insb(unsigned long port, void *dst, unsigned long count)
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{
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ioread8_rep(ioport_map(port, 1), dst, count);
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}
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EXPORT_SYMBOL(ioread8_rep);
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EXPORT_SYMBOL(insb);
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/*
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* Read COUNT 16-bit words from port PORT into memory starting at
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* SRC. SRC must be at least short aligned. This is used by the
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* IDE driver to read disk sectors. Performance is important, but
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* the interfaces seems to be slow: just using the inlined version
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* of the inw() breaks things.
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*/
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void ioread16_rep(void __iomem *port, void *dst, unsigned long count)
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{
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if (unlikely((unsigned long)dst & 0x3)) {
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if (!count)
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return;
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BUG_ON((unsigned long)dst & 0x1);
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count--;
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*(unsigned short *)dst = ioread16(port);
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dst += 2;
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}
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while (count >= 2) {
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unsigned int w;
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count -= 2;
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w = ioread16(port);
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w |= ioread16(port) << 16;
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*(unsigned int *)dst = w;
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dst += 4;
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}
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if (count) {
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*(unsigned short*)dst = ioread16(port);
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}
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}
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void insw(unsigned long port, void *dst, unsigned long count)
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{
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ioread16_rep(ioport_map(port, 2), dst, count);
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}
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EXPORT_SYMBOL(ioread16_rep);
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EXPORT_SYMBOL(insw);
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/*
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* Read COUNT 32-bit words from port PORT into memory starting at
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* SRC. Now works with any alignment in SRC. Performance is important,
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* but the interfaces seems to be slow: just using the inlined version
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* of the inl() breaks things.
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*/
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void ioread32_rep(void __iomem *port, void *dst, unsigned long count)
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{
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if (unlikely((unsigned long)dst & 0x3)) {
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while (count--) {
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struct S { int x __attribute__((packed)); };
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((struct S *)dst)->x = ioread32(port);
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dst += 4;
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}
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} else {
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/* Buffer 32-bit aligned. */
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while (count--) {
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*(unsigned int *)dst = ioread32(port);
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dst += 4;
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}
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}
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}
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void insl(unsigned long port, void *dst, unsigned long count)
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{
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ioread32_rep(ioport_map(port, 4), dst, count);
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}
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EXPORT_SYMBOL(ioread32_rep);
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EXPORT_SYMBOL(insl);
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/*
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* Like insb but in the opposite direction.
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* Don't worry as much about doing aligned memory transfers:
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* doing byte reads the "slow" way isn't nearly as slow as
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* doing byte writes the slow way (no r-m-w cycle).
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*/
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void iowrite8_rep(void __iomem *port, const void *xsrc, unsigned long count)
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{
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const unsigned char *src = xsrc;
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while (count--)
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iowrite8(*src++, port);
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}
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void outsb(unsigned long port, const void *src, unsigned long count)
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{
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iowrite8_rep(ioport_map(port, 1), src, count);
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}
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EXPORT_SYMBOL(iowrite8_rep);
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EXPORT_SYMBOL(outsb);
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/*
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* Like insw but in the opposite direction. This is used by the IDE
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* driver to write disk sectors. Performance is important, but the
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* interfaces seems to be slow: just using the inlined version of the
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* outw() breaks things.
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*/
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void iowrite16_rep(void __iomem *port, const void *src, unsigned long count)
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{
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if (unlikely((unsigned long)src & 0x3)) {
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if (!count)
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return;
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BUG_ON((unsigned long)src & 0x1);
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iowrite16(*(unsigned short *)src, port);
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src += 2;
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--count;
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}
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while (count >= 2) {
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unsigned int w;
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count -= 2;
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w = *(unsigned int *)src;
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src += 4;
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iowrite16(w >> 0, port);
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iowrite16(w >> 16, port);
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}
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if (count) {
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iowrite16(*(unsigned short *)src, port);
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}
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}
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void outsw(unsigned long port, const void *src, unsigned long count)
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{
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iowrite16_rep(ioport_map(port, 2), src, count);
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}
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EXPORT_SYMBOL(iowrite16_rep);
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EXPORT_SYMBOL(outsw);
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/*
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* Like insl but in the opposite direction. This is used by the IDE
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* driver to write disk sectors. Works with any alignment in SRC.
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* Performance is important, but the interfaces seems to be slow:
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* just using the inlined version of the outl() breaks things.
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*/
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void iowrite32_rep(void __iomem *port, const void *src, unsigned long count)
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{
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if (unlikely((unsigned long)src & 0x3)) {
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while (count--) {
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struct S { int x __attribute__((packed)); };
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iowrite32(((struct S *)src)->x, port);
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src += 4;
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}
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} else {
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/* Buffer 32-bit aligned. */
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while (count--) {
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iowrite32(*(unsigned int *)src, port);
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src += 4;
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}
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}
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}
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void outsl(unsigned long port, const void *src, unsigned long count)
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{
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iowrite32_rep(ioport_map(port, 4), src, count);
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}
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EXPORT_SYMBOL(iowrite32_rep);
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EXPORT_SYMBOL(outsl);
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/*
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* Copy data from IO memory space to "real" memory space.
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* This needs to be optimized.
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*/
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void memcpy_fromio(void *to, const volatile void __iomem *from, long count)
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{
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/* Optimize co-aligned transfers. Everything else gets handled
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a byte at a time. */
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if (count >= 8 && ((u64)to & 7) == ((u64)from & 7)) {
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count -= 8;
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do {
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*(u64 *)to = __raw_readq(from);
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count -= 8;
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to += 8;
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from += 8;
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} while (count >= 0);
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count += 8;
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}
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if (count >= 4 && ((u64)to & 3) == ((u64)from & 3)) {
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count -= 4;
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do {
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*(u32 *)to = __raw_readl(from);
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count -= 4;
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to += 4;
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from += 4;
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} while (count >= 0);
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count += 4;
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}
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if (count >= 2 && ((u64)to & 1) == ((u64)from & 1)) {
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count -= 2;
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do {
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*(u16 *)to = __raw_readw(from);
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count -= 2;
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to += 2;
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from += 2;
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} while (count >= 0);
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count += 2;
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}
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while (count > 0) {
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*(u8 *) to = __raw_readb(from);
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count--;
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to++;
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from++;
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}
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mb();
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}
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EXPORT_SYMBOL(memcpy_fromio);
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/*
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* Copy data from "real" memory space to IO memory space.
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* This needs to be optimized.
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*/
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void memcpy_toio(volatile void __iomem *to, const void *from, long count)
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{
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/* Optimize co-aligned transfers. Everything else gets handled
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a byte at a time. */
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/* FIXME -- align FROM. */
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if (count >= 8 && ((u64)to & 7) == ((u64)from & 7)) {
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count -= 8;
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do {
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__raw_writeq(*(const u64 *)from, to);
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count -= 8;
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to += 8;
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from += 8;
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} while (count >= 0);
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count += 8;
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}
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if (count >= 4 && ((u64)to & 3) == ((u64)from & 3)) {
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count -= 4;
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do {
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__raw_writel(*(const u32 *)from, to);
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count -= 4;
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to += 4;
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from += 4;
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} while (count >= 0);
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count += 4;
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}
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if (count >= 2 && ((u64)to & 1) == ((u64)from & 1)) {
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count -= 2;
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do {
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__raw_writew(*(const u16 *)from, to);
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count -= 2;
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to += 2;
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from += 2;
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} while (count >= 0);
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count += 2;
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}
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while (count > 0) {
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__raw_writeb(*(const u8 *) from, to);
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count--;
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to++;
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from++;
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}
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mb();
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}
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EXPORT_SYMBOL(memcpy_toio);
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/*
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* "memset" on IO memory space.
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*/
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void _memset_c_io(volatile void __iomem *to, unsigned long c, long count)
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{
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/* Handle any initial odd byte */
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if (count > 0 && ((u64)to & 1)) {
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__raw_writeb(c, to);
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to++;
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count--;
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}
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/* Handle any initial odd halfword */
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if (count >= 2 && ((u64)to & 2)) {
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__raw_writew(c, to);
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|
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);
|