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linux/arch/m68k/include/asm/raw_io.h
Finn Thain b6cf523c16 m68k: Unroll raw_outsb() loop 
Unroll the raw_outsb() loop using the optimized assembler code from
raw_outsw(). That code is copied and pasted, with movew changed to moveb.

This improves the performance of sequential write transfers using mac_esp
in PIO mode by 5% or 10%. (The DMA controller on the 840av/660av models is
still unsupported so PIO transfers are used.)

Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
2018-12-03 13:05:42 +01:00

473 lines
12 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
/*
* linux/include/asm-m68k/raw_io.h
*
* 10/20/00 RZ: - created from bits of io.h and ide.h to cleanup namespace
*
*/
#ifndef _RAW_IO_H
#define _RAW_IO_H
#ifdef __KERNEL__
#include <asm/byteorder.h>
/* ++roman: The assignments to temp. vars avoid that gcc sometimes generates
* two accesses to memory, which may be undesirable for some devices.
*/
#define in_8(addr) \
({ u8 __v = (*(__force volatile u8 *) (addr)); __v; })
#define in_be16(addr) \
({ u16 __v = (*(__force volatile u16 *) (addr)); __v; })
#define in_be32(addr) \
({ u32 __v = (*(__force volatile u32 *) (addr)); __v; })
#define in_le16(addr) \
({ u16 __v = le16_to_cpu(*(__force volatile __le16 *) (addr)); __v; })
#define in_le32(addr) \
({ u32 __v = le32_to_cpu(*(__force volatile __le32 *) (addr)); __v; })
#define out_8(addr,b) (void)((*(__force volatile u8 *) (addr)) = (b))
#define out_be16(addr,w) (void)((*(__force volatile u16 *) (addr)) = (w))
#define out_be32(addr,l) (void)((*(__force volatile u32 *) (addr)) = (l))
#define out_le16(addr,w) (void)((*(__force volatile __le16 *) (addr)) = cpu_to_le16(w))
#define out_le32(addr,l) (void)((*(__force volatile __le32 *) (addr)) = cpu_to_le32(l))
#define raw_inb in_8
#define raw_inw in_be16
#define raw_inl in_be32
#define __raw_readb in_8
#define __raw_readw in_be16
#define __raw_readl in_be32
#define raw_outb(val,port) out_8((port),(val))
#define raw_outw(val,port) out_be16((port),(val))
#define raw_outl(val,port) out_be32((port),(val))
#define __raw_writeb(val,addr) out_8((addr),(val))
#define __raw_writew(val,addr) out_be16((addr),(val))
#define __raw_writel(val,addr) out_be32((addr),(val))
/*
* Atari ROM port (cartridge port) ISA adapter, used for the EtherNEC NE2000
* network card driver.
* The ISA adapter connects address lines A9-A13 to ISA address lines A0-A4,
* and hardwires the rest of the ISA addresses for a base address of 0x300.
*
* Data lines D8-D15 are connected to ISA data lines D0-D7 for reading.
* For writes, address lines A1-A8 are latched to ISA data lines D0-D7
* (meaning the bit pattern on A1-A8 can be read back as byte).
*
* Read and write operations are distinguished by the base address used:
* reads are from the ROM A side range, writes are through the B side range
* addresses (A side base + 0x10000).
*
* Reads and writes are byte only.
*
* 16 bit reads and writes are necessary for the NetUSBee adapter's USB
* chipset - 16 bit words are read straight off the ROM port while 16 bit
* reads are split into two byte writes. The low byte is latched to the
* NetUSBee buffer by a read from the _read_ window (with the data pattern
* asserted as A1-A8 address pattern). The high byte is then written to the
* write range as usual, completing the write cycle.
*/
#if defined(CONFIG_ATARI_ROM_ISA)
#define rom_in_8(addr) \
({ u16 __v = (*(__force volatile u16 *) (addr)); __v >>= 8; __v; })
#define rom_in_be16(addr) \
({ u16 __v = (*(__force volatile u16 *) (addr)); __v; })
#define rom_in_le16(addr) \
({ u16 __v = le16_to_cpu(*(__force volatile u16 *) (addr)); __v; })
#define rom_out_8(addr, b) \
({u8 __w, __v = (b); u32 _addr = ((u32) (addr)); \
__w = ((*(__force volatile u8 *) ((_addr | 0x10000) + (__v<<1)))); })
#define rom_out_be16(addr, w) \
({u16 __w, __v = (w); u32 _addr = ((u32) (addr)); \
__w = ((*(__force volatile u16 *) ((_addr & 0xFFFF0000UL) + ((__v & 0xFF)<<1)))); \
__w = ((*(__force volatile u16 *) ((_addr | 0x10000) + ((__v >> 8)<<1)))); })
#define rom_out_le16(addr, w) \
({u16 __w, __v = (w); u32 _addr = ((u32) (addr)); \
__w = ((*(__force volatile u16 *) ((_addr & 0xFFFF0000UL) + ((__v >> 8)<<1)))); \
__w = ((*(__force volatile u16 *) ((_addr | 0x10000) + ((__v & 0xFF)<<1)))); })
#define raw_rom_inb rom_in_8
#define raw_rom_inw rom_in_be16
#define raw_rom_outb(val, port) rom_out_8((port), (val))
#define raw_rom_outw(val, port) rom_out_be16((port), (val))
#endif /* CONFIG_ATARI_ROM_ISA */
static inline void raw_insb(volatile u8 __iomem *port, u8 *buf, unsigned int len)
{
unsigned int i;
for (i = 0; i < len; i++)
*buf++ = in_8(port);
}
static inline void raw_outsb(volatile u8 __iomem *port, const u8 *buf,
unsigned int nr)
{
unsigned int tmp;
if (nr & 15) {
tmp = (nr & 15) - 1;
asm volatile (
"1: moveb %0@+,%2@; dbra %1,1b"
: "=a" (buf), "=d" (tmp)
: "a" (port), "0" (buf),
"1" (tmp));
}
if (nr >> 4) {
tmp = (nr >> 4) - 1;
asm volatile (
"1: "
"moveb %0@+,%2@; "
"moveb %0@+,%2@; "
"moveb %0@+,%2@; "
"moveb %0@+,%2@; "
"moveb %0@+,%2@; "
"moveb %0@+,%2@; "
"moveb %0@+,%2@; "
"moveb %0@+,%2@; "
"moveb %0@+,%2@; "
"moveb %0@+,%2@; "
"moveb %0@+,%2@; "
"moveb %0@+,%2@; "
"moveb %0@+,%2@; "
"moveb %0@+,%2@; "
"moveb %0@+,%2@; "
"moveb %0@+,%2@; "
"dbra %1,1b"
: "=a" (buf), "=d" (tmp)
: "a" (port), "0" (buf),
"1" (tmp));
}
}
static inline void raw_insw(volatile u16 __iomem *port, u16 *buf, unsigned int nr)
{
unsigned int tmp;
if (nr & 15) {
tmp = (nr & 15) - 1;
asm volatile (
"1: movew %2@,%0@+; dbra %1,1b"
: "=a" (buf), "=d" (tmp)
: "a" (port), "0" (buf),
"1" (tmp));
}
if (nr >> 4) {
tmp = (nr >> 4) - 1;
asm volatile (
"1: "
"movew %2@,%0@+; "
"movew %2@,%0@+; "
"movew %2@,%0@+; "
"movew %2@,%0@+; "
"movew %2@,%0@+; "
"movew %2@,%0@+; "
"movew %2@,%0@+; "
"movew %2@,%0@+; "
"movew %2@,%0@+; "
"movew %2@,%0@+; "
"movew %2@,%0@+; "
"movew %2@,%0@+; "
"movew %2@,%0@+; "
"movew %2@,%0@+; "
"movew %2@,%0@+; "
"movew %2@,%0@+; "
"dbra %1,1b"
: "=a" (buf), "=d" (tmp)
: "a" (port), "0" (buf),
"1" (tmp));
}
}
static inline void raw_outsw(volatile u16 __iomem *port, const u16 *buf,
unsigned int nr)
{
unsigned int tmp;
if (nr & 15) {
tmp = (nr & 15) - 1;
asm volatile (
"1: movew %0@+,%2@; dbra %1,1b"
: "=a" (buf), "=d" (tmp)
: "a" (port), "0" (buf),
"1" (tmp));
}
if (nr >> 4) {
tmp = (nr >> 4) - 1;
asm volatile (
"1: "
"movew %0@+,%2@; "
"movew %0@+,%2@; "
"movew %0@+,%2@; "
"movew %0@+,%2@; "
"movew %0@+,%2@; "
"movew %0@+,%2@; "
"movew %0@+,%2@; "
"movew %0@+,%2@; "
"movew %0@+,%2@; "
"movew %0@+,%2@; "
"movew %0@+,%2@; "
"movew %0@+,%2@; "
"movew %0@+,%2@; "
"movew %0@+,%2@; "
"movew %0@+,%2@; "
"movew %0@+,%2@; "
"dbra %1,1b"
: "=a" (buf), "=d" (tmp)
: "a" (port), "0" (buf),
"1" (tmp));
}
}
static inline void raw_insl(volatile u32 __iomem *port, u32 *buf, unsigned int nr)
{
unsigned int tmp;
if (nr & 15) {
tmp = (nr & 15) - 1;
asm volatile (
"1: movel %2@,%0@+; dbra %1,1b"
: "=a" (buf), "=d" (tmp)
: "a" (port), "0" (buf),
"1" (tmp));
}
if (nr >> 4) {
tmp = (nr >> 4) - 1;
asm volatile (
"1: "
"movel %2@,%0@+; "
"movel %2@,%0@+; "
"movel %2@,%0@+; "
"movel %2@,%0@+; "
"movel %2@,%0@+; "
"movel %2@,%0@+; "
"movel %2@,%0@+; "
"movel %2@,%0@+; "
"movel %2@,%0@+; "
"movel %2@,%0@+; "
"movel %2@,%0@+; "
"movel %2@,%0@+; "
"movel %2@,%0@+; "
"movel %2@,%0@+; "
"movel %2@,%0@+; "
"movel %2@,%0@+; "
"dbra %1,1b"
: "=a" (buf), "=d" (tmp)
: "a" (port), "0" (buf),
"1" (tmp));
}
}
static inline void raw_outsl(volatile u32 __iomem *port, const u32 *buf,
unsigned int nr)
{
unsigned int tmp;
if (nr & 15) {
tmp = (nr & 15) - 1;
asm volatile (
"1: movel %0@+,%2@; dbra %1,1b"
: "=a" (buf), "=d" (tmp)
: "a" (port), "0" (buf),
"1" (tmp));
}
if (nr >> 4) {
tmp = (nr >> 4) - 1;
asm volatile (
"1: "
"movel %0@+,%2@; "
"movel %0@+,%2@; "
"movel %0@+,%2@; "
"movel %0@+,%2@; "
"movel %0@+,%2@; "
"movel %0@+,%2@; "
"movel %0@+,%2@; "
"movel %0@+,%2@; "
"movel %0@+,%2@; "
"movel %0@+,%2@; "
"movel %0@+,%2@; "
"movel %0@+,%2@; "
"movel %0@+,%2@; "
"movel %0@+,%2@; "
"movel %0@+,%2@; "
"movel %0@+,%2@; "
"dbra %1,1b"
: "=a" (buf), "=d" (tmp)
: "a" (port), "0" (buf),
"1" (tmp));
}
}
static inline void raw_insw_swapw(volatile u16 __iomem *port, u16 *buf,
unsigned int nr)
{
if ((nr) % 8)
__asm__ __volatile__
("\tmovel %0,%/a0\n\t"
"movel %1,%/a1\n\t"
"movel %2,%/d6\n\t"
"subql #1,%/d6\n"
"1:\tmovew %/a0@,%/d0\n\t"
"rolw #8,%/d0\n\t"
"movew %/d0,%/a1@+\n\t"
"dbra %/d6,1b"
:
: "g" (port), "g" (buf), "g" (nr)
: "d0", "a0", "a1", "d6");
else
__asm__ __volatile__
("movel %0,%/a0\n\t"
"movel %1,%/a1\n\t"
"movel %2,%/d6\n\t"
"lsrl #3,%/d6\n\t"
"subql #1,%/d6\n"
"1:\tmovew %/a0@,%/d0\n\t"
"rolw #8,%/d0\n\t"
"movew %/d0,%/a1@+\n\t"
"movew %/a0@,%/d0\n\t"
"rolw #8,%/d0\n\t"
"movew %/d0,%/a1@+\n\t"
"movew %/a0@,%/d0\n\t"
"rolw #8,%/d0\n\t"
"movew %/d0,%/a1@+\n\t"
"movew %/a0@,%/d0\n\t"
"rolw #8,%/d0\n\t"
"movew %/d0,%/a1@+\n\t"
"movew %/a0@,%/d0\n\t"
"rolw #8,%/d0\n\t"
"movew %/d0,%/a1@+\n\t"
"movew %/a0@,%/d0\n\t"
"rolw #8,%/d0\n\t"
"movew %/d0,%/a1@+\n\t"
"movew %/a0@,%/d0\n\t"
"rolw #8,%/d0\n\t"
"movew %/d0,%/a1@+\n\t"
"movew %/a0@,%/d0\n\t"
"rolw #8,%/d0\n\t"
"movew %/d0,%/a1@+\n\t"
"dbra %/d6,1b"
:
: "g" (port), "g" (buf), "g" (nr)
: "d0", "a0", "a1", "d6");
}
static inline void raw_outsw_swapw(volatile u16 __iomem *port, const u16 *buf,
unsigned int nr)
{
if ((nr) % 8)
__asm__ __volatile__
("movel %0,%/a0\n\t"
"movel %1,%/a1\n\t"
"movel %2,%/d6\n\t"
"subql #1,%/d6\n"
"1:\tmovew %/a1@+,%/d0\n\t"
"rolw #8,%/d0\n\t"
"movew %/d0,%/a0@\n\t"
"dbra %/d6,1b"
:
: "g" (port), "g" (buf), "g" (nr)
: "d0", "a0", "a1", "d6");
else
__asm__ __volatile__
("movel %0,%/a0\n\t"
"movel %1,%/a1\n\t"
"movel %2,%/d6\n\t"
"lsrl #3,%/d6\n\t"
"subql #1,%/d6\n"
"1:\tmovew %/a1@+,%/d0\n\t"
"rolw #8,%/d0\n\t"
"movew %/d0,%/a0@\n\t"
"movew %/a1@+,%/d0\n\t"
"rolw #8,%/d0\n\t"
"movew %/d0,%/a0@\n\t"
"movew %/a1@+,%/d0\n\t"
"rolw #8,%/d0\n\t"
"movew %/d0,%/a0@\n\t"
"movew %/a1@+,%/d0\n\t"
"rolw #8,%/d0\n\t"
"movew %/d0,%/a0@\n\t"
"movew %/a1@+,%/d0\n\t"
"rolw #8,%/d0\n\t"
"movew %/d0,%/a0@\n\t"
"movew %/a1@+,%/d0\n\t"
"rolw #8,%/d0\n\t"
"movew %/d0,%/a0@\n\t"
"movew %/a1@+,%/d0\n\t"
"rolw #8,%/d0\n\t"
"movew %/d0,%/a0@\n\t"
"movew %/a1@+,%/d0\n\t"
"rolw #8,%/d0\n\t"
"movew %/d0,%/a0@\n\t"
"dbra %/d6,1b"
:
: "g" (port), "g" (buf), "g" (nr)
: "d0", "a0", "a1", "d6");
}
#if defined(CONFIG_ATARI_ROM_ISA)
static inline void raw_rom_insb(volatile u8 __iomem *port, u8 *buf, unsigned int len)
{
unsigned int i;
for (i = 0; i < len; i++)
*buf++ = rom_in_8(port);
}
static inline void raw_rom_outsb(volatile u8 __iomem *port, const u8 *buf,
unsigned int len)
{
unsigned int i;
for (i = 0; i < len; i++)
rom_out_8(port, *buf++);
}
static inline void raw_rom_insw(volatile u16 __iomem *port, u16 *buf,
unsigned int nr)
{
unsigned int i;
for (i = 0; i < nr; i++)
*buf++ = rom_in_be16(port);
}
static inline void raw_rom_outsw(volatile u16 __iomem *port, const u16 *buf,
unsigned int nr)
{
unsigned int i;
for (i = 0; i < nr; i++)
rom_out_be16(port, *buf++);
}
static inline void raw_rom_insw_swapw(volatile u16 __iomem *port, u16 *buf,
unsigned int nr)
{
unsigned int i;
for (i = 0; i < nr; i++)
*buf++ = rom_in_le16(port);
}
static inline void raw_rom_outsw_swapw(volatile u16 __iomem *port, const u16 *buf,
unsigned int nr)
{
unsigned int i;
for (i = 0; i < nr; i++)
rom_out_le16(port, *buf++);
}
#endif /* CONFIG_ATARI_ROM_ISA */
#endif /* __KERNEL__ */
#endif /* _RAW_IO_H */
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