ah_osdep.h

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/*-
 * Copyright (c) 2002-2004 Sam Leffler, Errno Consulting, Atheros
 * Communications, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the following conditions are met:
 * 1. The materials contained herein are unmodified and are used
 *    unmodified.
 * 2. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following NO
 *    ''WARRANTY'' disclaimer below (''Disclaimer''), without
 *    modification.
 * 3. Redistributions in binary form must reproduce at minimum a
 *    disclaimer similar to the Disclaimer below and any redistribution
 *    must be conditioned upon including a substantially similar
 *    Disclaimer requirement for further binary redistribution.
 * 4. Neither the names of the above-listed copyright holders nor the
 *    names of any contributors may be used to endorse or promote
 *    product derived from this software without specific prior written
 *    permission.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT,
 * MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE
 * FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGES.
 *
 * $Id: ah_osdep.h,v 1.3 2005/02/22 19:07:25 jbicket Exp $
 */
#ifndef _ATH_AH_OSDEP_H_
#define _ATH_AH_OSDEP_H_
/*
 * Atheros Hardware Access Layer (HAL) OS Dependent Definitions.
 */

/*
 * Starting with 2.6.4 the kernel supports a configuration option
 * to pass parameters in registers.  If this is enabled we must
 * mark all function interfaces in+out of the HAL to pass parameters
 * on the stack as this is the convention used internally (for
 * maximum portability).
 */
#ifdef CONFIG_REGPARM
#define __ahdecl        __attribute__((regparm(0)))
#else
#define __ahdecl
#endif
#ifndef __packed
#define __packed        __attribute__((__packed__))
#endif

/*
 * When building the HAL proper we use no GPL-contaminated include
 * files and must define these types ourself.  Beware of these being
 * mismatched against the contents of <linux/types.h>
 */
#ifndef _LINUX_TYPES_H
/* NB: arm defaults to unsigned so be explicit */
typedef signed char int8_t;
typedef short int16_t;
typedef int int32_t;
typedef long long int64_t;

typedef unsigned char u_int8_t;
typedef unsigned short u_int16_t;
typedef unsigned int u_int32_t;
typedef unsigned long long u_int64_t;

typedef unsigned int size_t;
typedef unsigned int u_int;
typedef void *va_list;
#endif

/*
 * Linux/BSD gcc compatibility shims.
 */
#define __printflike(_a,_b) \
        __attribute__ ((__format__ (__printf__, _a, _b)))
#define __va_list       va_list 
#define OS_INLINE       __inline

typedef void* HAL_SOFTC;
typedef int HAL_BUS_TAG;
typedef void* HAL_BUS_HANDLE;
typedef u_int32_t HAL_BUS_ADDR;                 /* XXX architecture dependent */

/*
 * Delay n microseconds.
 */
extern  void __ahdecl ath_hal_delay(int);
#define OS_DELAY(_n)    ath_hal_delay(_n)

#define OS_MEMZERO(_a, _n)      ath_hal_memzero((_a), (_n))
extern void __ahdecl ath_hal_memzero(void *, size_t);
#define OS_MEMCPY(_d, _s, _n)   ath_hal_memcpy(_d,_s,_n)
extern void * __ahdecl ath_hal_memcpy(void *, const void *, size_t);

#ifndef abs
#define abs(_a)         __builtin_abs(_a)
#endif

struct ath_hal;
extern  u_int32_t __ahdecl ath_hal_getuptime(struct ath_hal *);
#define OS_GETUPTIME(_ah)       ath_hal_getuptime(_ah)

/*
 * Byte order/swapping support.
 */
#define AH_LITTLE_ENDIAN        1234
#define AH_BIG_ENDIAN           4321

#if AH_BYTE_ORDER == AH_BIG_ENDIAN
/*
 * This could be optimized but since we only use it for
 * a few registers there's little reason to do so.
 */
static inline u_int32_t
__bswap32(u_int32_t _x)
{
        return ((u_int32_t)(
              (((const u_int8_t *)(&_x))[0]    ) |
              (((const u_int8_t *)(&_x))[1]<< 8) |
              (((const u_int8_t *)(&_x))[2]<<16) |
              (((const u_int8_t *)(&_x))[3]<<24))
        );
}
#else
#define __bswap32(_x)   (_x)
#endif

/*
 * Register read/write; we assume the registers will always
 * be memory-mapped.  Note that register accesses are done
 * using target-specific functions when debugging is enabled
 * (AH_DEBUG) or we are explicitly configured this way.  The
 * latter is used on some platforms where the full i/o space
 * cannot be directly mapped.
 *
 * The hardware registers are native little-endian byte order.
 * Big-endian hosts are handled by enabling hardware byte-swap
 * of register reads and writes at reset.  But the PCI clock
 * domain registers are not byte swapped!  Thus, on big-endian
 * platforms we have to byte-swap thoese registers specifically.
 * Most of this code is collapsed at compile time because the
 * register values are constants.
 */
#if AH_BYTE_ORDER == AH_BIG_ENDIAN
#define _OS_REG_WRITE(_ah, _reg, _val) do {                                 \
        if ( (_reg) >= 0x4000 && (_reg) < 0x5000)                           \
                *((volatile u_int32_t *)((_ah)->ah_sh + (_reg))) =          \
                        __bswap32((_val));                                  \
        else                                                                \
                *((volatile u_int32_t *)((_ah)->ah_sh + (_reg))) = (_val);  \
} while (0)
#define _OS_REG_READ(_ah, _reg) \
        (((_reg) >= 0x4000 && (_reg) < 0x5000) ? \
                __bswap32(*((volatile u_int32_t *)((_ah)->ah_sh + (_reg)))) : \
                *((volatile u_int32_t *)((_ah)->ah_sh + (_reg))))
#else /* AH_LITTLE_ENDIAN */
#define _OS_REG_WRITE(_ah, _reg, _val) do { \
        *((volatile u_int32_t *)((_ah)->ah_sh + (_reg))) = (_val); \
} while (0)
#define _OS_REG_READ(_ah, _reg) \
        *((volatile u_int32_t *)((_ah)->ah_sh + (_reg)))
#endif /* AH_BYTE_ORDER */

#if defined(AH_DEBUG) || defined(AH_REGOPS_FUNC) || defined(AH_DEBUG_ALQ)
/* use functions to do register operations */
#define OS_REG_WRITE(_ah, _reg, _val)   ath_hal_reg_write(_ah, _reg, _val)
#define OS_REG_READ(_ah, _reg)          ath_hal_reg_read(_ah, _reg)

extern  void __ahdecl ath_hal_reg_write(struct ath_hal *ah,
                u_int reg, u_int32_t val);
extern  u_int32_t __ahdecl ath_hal_reg_read(struct ath_hal *ah, u_int reg);
#else
/* inline register operations */
#define OS_REG_WRITE(_ah, _reg, _val)   _OS_REG_WRITE(_ah, _reg, _val)
#define OS_REG_READ(_ah, _reg)          _OS_REG_READ(_ah, _reg)
#endif /* AH_DEBUG || AH_REGFUNC || AH_DEBUG_ALQ */

#ifdef AH_DEBUG_ALQ
extern  void __ahdecl OS_MARK(struct ath_hal *, u_int id, u_int32_t value);
#else
#define OS_MARK(_ah, _id, _v)
#endif

/*
 * Linux-specific attach/detach methods needed for module reference counting.
 *
 * XXX We can't use HAL_STATUS because the type isn't defined at this
 *     point (circular dependency); we wack the type and patch things
 *     up in the function.
 *
 * NB: These are intentionally not marked __ahdecl since they are
 *     compiled with the default calling convetion and are not called
 *     from within the HAL.
 */
extern  struct ath_hal *_ath_hal_attach(u_int16_t devid, HAL_SOFTC,
                HAL_BUS_TAG, HAL_BUS_HANDLE, void* status);
extern  void ath_hal_detach(struct ath_hal *);

#endif /* _ATH_AH_OSDEP_H_ */

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