On Friday 18 April 2014, Ley Foon Tan wrote:
> +
> +#include <asm/pgtable-bits.h>
> +
> +#define IO_SPACE_LIMIT 0xffffffff
Please use 0xffff here, this should work for almost any PCI bus.
> +
> +#ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE
> +# define __IO_USE_DUFFS
> +#endif
> +
> +#ifdef __IO_USE_DUFFS
> +
> +/* Use "Duff's Device" to unroll the loops. */
> +#define __IO_OUT_LOOP(a, b, l) \
> + do { \
> + if (l > 0) { \
> + int _n = (l + 7) / 8; \
> + switch (l % 8) { \
> + case 0: \
> + do { \
> + *a = *b++; \
I would recommend just doing all of this in out-of-line implementations
rather than macros and inline functions.
> +
> +/*
> + * make the short names macros so specific devices
> + * can override them as required
> + */
> +#define inb(addr) readb(addr)
> +#define inw(addr) readw(addr)
> +#define inl(addr) readl(addr)
> +#define outb(x, addr) ((void) writeb(x, addr))
> +#define outw(x, addr) ((void) writew(x, addr))
> +#define outl(x, addr) ((void) writel(x, addr))
This makes no sense: the legacy PC I/O accessors take a completely
different argument type: I would recommend to make both inline
functions so you can ensure that readl() gets passed an __iomem
pointer, while inl() gets an integer number.
Please see the asm-generic version for an example. You should also
define a non-NULL PCI_IOBASE to which the PCI I/O space gets mapped.
> +#define virt_to_bus virt_to_phys
> +#define bus_to_virt phys_to_virt
Please drop these, and the CONFIG_VIRT_TO_BUS Kconfig option,
and fix all drivers that rely on it.
> +#define ioport_map(port, nr) ioremap(port, nr)
> +#define ioport_unmap(port) iounmap(port)
Use this one instead:
#ifdef CONFIG_PCI
static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
{
return PCI_IOBASE + port;
}
static inline void __iomem *ioport_unmap(void __iomem *)
{
}
#endif
> +/* Macros used for smc91x.c driver */
> +#define readsb(p, d, l) insb(p, d, l)
> +#define readsw(p, d, l) insw(p, d, l)
> +#define readsl(p, d, l) insl(p, d, l)
> +#define writesb(p, d, l) outsb(p, d, l)
> +#define writesw(p, d, l) outsw(p, d, l)
> +#define writesl(p, d, l) outsl(p, d, l)
These should of course not fall back to the PCI I/O space functions.
You can do it the other way round.
Arnd
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