arch/powerpc/include/asm/dcr-native.h

   1 /*
   2  * (c) Copyright 2006 Benjamin Herrenschmidt, IBM Corp.
   3  *                    <benh@kernel.crashing.org>
   4  *
   5  *   This program is free software;  you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License as published by
   7  *   the Free Software Foundation; either version 2 of the License, or
   8  *   (at your option) any later version.
   9  *
  10  *   This program is distributed in the hope that it will be useful,
  11  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  13  *   the GNU General Public License for more details.
  14  *
  15  *   You should have received a copy of the GNU General Public License
  16  *   along with this program;  if not, write to the Free Software
  17  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18  */
  19
  20 #ifndef _ASM_POWERPC_DCR_NATIVE_H
  21 #define _ASM_POWERPC_DCR_NATIVE_H
  22 #ifdef __KERNEL__
  23 #ifndef __ASSEMBLY__
  24
  25 #include <linux/spinlock.h>
  26 #include <asm/cputable.h>
  27 #include <asm/cpu_has_feature.h>
  28
  29 typedef struct {
  30         unsigned int base;
  31 } dcr_host_native_t;
  32
  33 static inline bool dcr_map_ok_native(dcr_host_native_t host)
  34 {
  35         return true;
  36 }
  37
  38 #define dcr_map_native(dev, dcr_n, dcr_c) \
  39         ((dcr_host_native_t){ .base = (dcr_n) })
  40 #define dcr_unmap_native(host, dcr_c)           do {} while (0)
  41 #define dcr_read_native(host, dcr_n)            mfdcr(dcr_n + host.base)
  42 #define dcr_write_native(host, dcr_n, value)    mtdcr(dcr_n + host.base, value)
  43
  44 /* Table based DCR accessors */
  45 extern void __mtdcr(unsigned int reg, unsigned int val);
  46 extern unsigned int __mfdcr(unsigned int reg);
  47
  48 /* mfdcrx/mtdcrx instruction based accessors. We hand code
  49  * the opcodes in order not to depend on newer binutils
  50  */
  51 static inline unsigned int mfdcrx(unsigned int reg)
  52 {
  53         unsigned int ret;
  54         asm volatile(".long 0x7c000206 | (%0 << 21) | (%1 << 16)"
  55                      : "=r" (ret) : "r" (reg));
  56         return ret;
  57 }
  58
  59 static inline void mtdcrx(unsigned int reg, unsigned int val)
  60 {
  61         asm volatile(".long 0x7c000306 | (%0 << 21) | (%1 << 16)"
  62                      : : "r" (val), "r" (reg));
  63 }
  64
  65 #define mfdcr(rn)                                               \
  66         ({unsigned int rval;                                    \
  67         if (__builtin_constant_p(rn) && rn < 1024)              \
  68                 asm volatile("mfdcr %0," __stringify(rn)        \
  69                               : "=r" (rval));                   \
  70         else if (likely(cpu_has_feature(CPU_FTR_INDEXED_DCR)))  \
  71                 rval = mfdcrx(rn);                              \
  72         else                                                    \
  73                 rval = __mfdcr(rn);                             \
  74         rval;})
  75
  76 #define mtdcr(rn, v)                                            \
  77 do {                                                            \
  78         if (__builtin_constant_p(rn) && rn < 1024)              \
  79                 asm volatile("mtdcr " __stringify(rn) ",%0"     \
  80                               : : "r" (v));                     \
  81         else if (likely(cpu_has_feature(CPU_FTR_INDEXED_DCR)))  \
  82                 mtdcrx(rn, v);                                  \
  83         else                                                    \
  84                 __mtdcr(rn, v);                                 \
  85 } while (0)
  86
  87 /* R/W of indirect DCRs make use of standard naming conventions for DCRs */
  88 extern spinlock_t dcr_ind_lock;
  89
  90 static inline unsigned __mfdcri(int base_addr, int base_data, int reg)
  91 {
  92         unsigned long flags;
  93         unsigned int val;
  94
  95         spin_lock_irqsave(&dcr_ind_lock, flags);
  96         if (cpu_has_feature(CPU_FTR_INDEXED_DCR)) {
  97                 mtdcrx(base_addr, reg);
  98                 val = mfdcrx(base_data);
  99         } else {
 100                 __mtdcr(base_addr, reg);
 101                 val = __mfdcr(base_data);
 102         }
 103         spin_unlock_irqrestore(&dcr_ind_lock, flags);
 104         return val;
 105 }
 106
 107 static inline void __mtdcri(int base_addr, int base_data, int reg,
 108                             unsigned val)
 109 {
 110         unsigned long flags;
 111
 112         spin_lock_irqsave(&dcr_ind_lock, flags);
 113         if (cpu_has_feature(CPU_FTR_INDEXED_DCR)) {
 114                 mtdcrx(base_addr, reg);
 115                 mtdcrx(base_data, val);
 116         } else {
 117                 __mtdcr(base_addr, reg);
 118                 __mtdcr(base_data, val);
 119         }
 120         spin_unlock_irqrestore(&dcr_ind_lock, flags);
 121 }
 122
 123 static inline void __dcri_clrset(int base_addr, int base_data, int reg,
 124                                  unsigned clr, unsigned set)
 125 {
 126         unsigned long flags;
 127         unsigned int val;
 128
 129         spin_lock_irqsave(&dcr_ind_lock, flags);
 130         if (cpu_has_feature(CPU_FTR_INDEXED_DCR)) {
 131                 mtdcrx(base_addr, reg);
 132                 val = (mfdcrx(base_data) & ~clr) | set;
 133                 mtdcrx(base_data, val);
 134         } else {
 135                 __mtdcr(base_addr, reg);
 136                 val = (__mfdcr(base_data) & ~clr) | set;
 137                 __mtdcr(base_data, val);
 138         }
 139         spin_unlock_irqrestore(&dcr_ind_lock, flags);
 140 }
 141
 142 #define mfdcri(base, reg)       __mfdcri(DCRN_ ## base ## _CONFIG_ADDR, \
 143                                          DCRN_ ## base ## _CONFIG_DATA, \
 144                                          reg)
 145
 146 #define mtdcri(base, reg, data) __mtdcri(DCRN_ ## base ## _CONFIG_ADDR, \
 147                                          DCRN_ ## base ## _CONFIG_DATA, \
 148                                          reg, data)
 149
 150 #define dcri_clrset(base, reg, clr, set)        __dcri_clrset(DCRN_ ## base ## _CONFIG_ADDR,    \
 151                                                               DCRN_ ## base ## _CONFIG_DATA,    \
 152                                                               reg, clr, set)
 153
 154 #endif /* __ASSEMBLY__ */
 155 #endif /* __KERNEL__ */
 156 #endif /* _ASM_POWERPC_DCR_NATIVE_H */