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dcr-native.h

/*
 * (c) Copyright 2006 Benjamin Herrenschmidt, IBM Corp.
 *                    <benh@kernel.crashing.org>
 *
 *   This program is free software;  you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program;  if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#ifndef _ASM_POWERPC_DCR_NATIVE_H
#define _ASM_POWERPC_DCR_NATIVE_H
#ifdef __KERNEL__
#ifndef __ASSEMBLY__

#include <linux/spinlock.h>

typedef struct {
      unsigned int base;
} dcr_host_native_t;

static inline bool dcr_map_ok_native(dcr_host_native_t host)
{
      return 1;
}

#define dcr_map_native(dev, dcr_n, dcr_c) \
      ((dcr_host_native_t){ .base = (dcr_n) })
#define dcr_unmap_native(host, dcr_c)           do {} while (0)
#define dcr_read_native(host, dcr_n)            mfdcr(dcr_n + host.base)
#define dcr_write_native(host, dcr_n, value)    mtdcr(dcr_n + host.base, value)

/* Device Control Registers */
void __mtdcr(int reg, unsigned int val);
unsigned int __mfdcr(int reg);
#define mfdcr(rn)                               \
      ({unsigned int rval;                            \
      if (__builtin_constant_p(rn))                   \
            asm volatile("mfdcr %0," __stringify(rn)  \
                          : "=r" (rval));             \
      else                                      \
            rval = __mfdcr(rn);                       \
      rval;})

#define mtdcr(rn, v)                                  \
do {                                            \
      if (__builtin_constant_p(rn))                   \
            asm volatile("mtdcr " __stringify(rn) ",%0"     \
                        : : "r" (v));                 \
      else                                      \
            __mtdcr(rn, v);                           \
} while (0)

/* R/W of indirect DCRs make use of standard naming conventions for DCRs */
extern spinlock_t dcr_ind_lock;

static inline unsigned __mfdcri(int base_addr, int base_data, int reg)
{
      unsigned long flags;
      unsigned int val;

      spin_lock_irqsave(&dcr_ind_lock, flags);
      __mtdcr(base_addr, reg);
      val = __mfdcr(base_data);
      spin_unlock_irqrestore(&dcr_ind_lock, flags);
      return val;
}

static inline void __mtdcri(int base_addr, int base_data, int reg,
                      unsigned val)
{
      unsigned long flags;

      spin_lock_irqsave(&dcr_ind_lock, flags);
      __mtdcr(base_addr, reg);
      __mtdcr(base_data, val);
      spin_unlock_irqrestore(&dcr_ind_lock, flags);
}

static inline void __dcri_clrset(int base_addr, int base_data, int reg,
                         unsigned clr, unsigned set)
{
      unsigned long flags;
      unsigned int val;

      spin_lock_irqsave(&dcr_ind_lock, flags);
      __mtdcr(base_addr, reg);
      val = (__mfdcr(base_data) & ~clr) | set;
      __mtdcr(base_data, val);
      spin_unlock_irqrestore(&dcr_ind_lock, flags);
}

#define mfdcri(base, reg)     __mfdcri(DCRN_ ## base ## _CONFIG_ADDR,   \
                               DCRN_ ## base ## _CONFIG_DATA,     \
                               reg)

#define mtdcri(base, reg, data)     __mtdcri(DCRN_ ## base ## _CONFIG_ADDR,   \
                               DCRN_ ## base ## _CONFIG_DATA,     \
                               reg, data)

#define dcri_clrset(base, reg, clr, set)  __dcri_clrset(DCRN_ ## base ## _CONFIG_ADDR,    \
                                                DCRN_ ## base ## _CONFIG_DATA,      \
                                                reg, clr, set)

#endif /* __ASSEMBLY__ */
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_DCR_NATIVE_H */

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