arch/blackfin/include/asm/irq.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file COPYING in the main directory of this archive
   4  * for more details.
   5  *
   6  * Changed by HuTao Apr18, 2003
   7  *
   8  * Copyright was missing when I got the code so took from MIPS arch ...MaTed---
   9  * Copyright (C) 1994 by Waldorf GMBH, written by Ralf Baechle
  10  * Copyright (C) 1995, 96, 97, 98, 99, 2000, 2001 by Ralf Baechle
  11  *
  12  * Adapted for BlackFin (ADI) by Ted Ma <mated@sympatico.ca>
  13  * Copyright (c) 2002 Arcturus Networks Inc. (www.arcturusnetworks.com)
  14  * Copyright (c) 2002 Lineo, Inc. <mattw@lineo.com>
  15  */
  16
  17 #ifndef _BFIN_IRQ_H_
  18 #define _BFIN_IRQ_H_
  19
  20 /* SYS_IRQS and NR_IRQS are defined in <mach-bf5xx/irq.h>*/
  21 #include <mach/irq.h>
  22 #include <asm/pda.h>
  23 #include <asm/processor.h>
  24
  25 #ifdef CONFIG_SMP
  26 /* Forward decl needed due to cdef inter dependencies */
  27 static inline uint32_t __pure bfin_dspid(void);
  28 # define blackfin_core_id() (bfin_dspid() & 0xff)
  29 # define bfin_irq_flags cpu_pda[blackfin_core_id()].imask
  30 #else
  31 extern unsigned long bfin_irq_flags;
  32 #endif
  33
  34 #ifdef CONFIG_IPIPE
  35
  36 #include <linux/ipipe_trace.h>
  37
  38 void __ipipe_unstall_root(void);
  39
  40 void __ipipe_restore_root(unsigned long flags);
  41
  42 #ifdef CONFIG_DEBUG_HWERR
  43 # define __all_masked_irq_flags 0x3f
  44 # define __save_and_cli_hw(x) \
  45         __asm__ __volatile__( \
  46                 "cli %0;" \
  47                 "sti %1;" \
  48                 : "=&d"(x) \
  49                 : "d" (0x3F) \
  50         )
  51 #else
  52 # define __all_masked_irq_flags 0x1f
  53 # define __save_and_cli_hw(x) \
  54         __asm__ __volatile__( \
  55                 "cli %0;" \
  56                 : "=&d"(x) \
  57         )
  58 #endif
  59
  60 #define irqs_enabled_from_flags_hw(x)   ((x) != __all_masked_irq_flags)
  61 #define raw_irqs_disabled_flags(flags)  (!irqs_enabled_from_flags_hw(flags))
  62 #define local_test_iflag_hw(x)          irqs_enabled_from_flags_hw(x)
  63
  64 #define local_save_flags(x)                                             \
  65         do {                                                            \
  66                 (x) = __ipipe_test_root() ? \
  67                         __all_masked_irq_flags : bfin_irq_flags; \
  68         } while (0)
  69
  70 #define local_irq_save(x)                               \
  71         do {                                            \
  72                 (x) = __ipipe_test_and_stall_root();    \
  73         } while (0)
  74
  75 #define local_irq_restore(x)    __ipipe_restore_root(x)
  76 #define local_irq_disable()     __ipipe_stall_root()
  77 #define local_irq_enable()      __ipipe_unstall_root()
  78 #define irqs_disabled()         __ipipe_test_root()
  79
  80 #define local_save_flags_hw(x) \
  81         __asm__ __volatile__( \
  82                 "cli %0;" \
  83                 "sti %0;" \
  84                 : "=d"(x) \
  85         )
  86
  87 #define irqs_disabled_hw()                              \
  88         ({                                              \
  89                 unsigned long flags;                    \
  90                 local_save_flags_hw(flags);             \
  91                 !irqs_enabled_from_flags_hw(flags);     \
  92         })
  93
  94 static inline unsigned long raw_mangle_irq_bits(int virt, unsigned long real)
  95 {
  96         /* Merge virtual and real interrupt mask bits into a single
  97            32bit word. */
  98         return (real & ~(1 << 31)) | ((virt != 0) << 31);
  99 }
 100
 101 static inline int raw_demangle_irq_bits(unsigned long *x)
 102 {
 103         int virt = (*x & (1 << 31)) != 0;
 104         *x &= ~(1L << 31);
 105         return virt;
 106 }
 107
 108 #ifdef CONFIG_IPIPE_TRACE_IRQSOFF
 109
 110 #define local_irq_disable_hw()                                          \
 111         do {                                                            \
 112                 int _tmp_dummy;                                         \
 113                 if (!irqs_disabled_hw())                                \
 114                         ipipe_trace_begin(0x80000000);                  \
 115                 __asm__ __volatile__ ("cli %0;" : "=d" (_tmp_dummy) : );        \
 116         } while (0)
 117
 118 #define local_irq_enable_hw()                                           \
 119         do {                                                            \
 120                 if (irqs_disabled_hw())                                 \
 121                         ipipe_trace_end(0x80000000);                    \
 122                 __asm__ __volatile__ ("sti %0;" : : "d"(bfin_irq_flags));       \
 123         } while (0)
 124
 125 #define local_irq_save_hw(x)                            \
 126         do {                                            \
 127                 __save_and_cli_hw(x);                   \
 128                 if (local_test_iflag_hw(x))             \
 129                         ipipe_trace_begin(0x80000001);  \
 130         } while (0)
 131
 132 #define local_irq_restore_hw(x)                         \
 133         do {                                            \
 134                 if (local_test_iflag_hw(x)) {           \
 135                         ipipe_trace_end(0x80000001);    \
 136                         local_irq_enable_hw_notrace();  \
 137                 }                                       \
 138         } while (0)
 139
 140 #define local_irq_disable_hw_notrace()                                  \
 141         do {                                                            \
 142                 int _tmp_dummy;                                         \
 143                 __asm__ __volatile__ ("cli %0;" : "=d" (_tmp_dummy) : );        \
 144         } while (0)
 145
 146 #define local_irq_enable_hw_notrace() \
 147         __asm__ __volatile__( \
 148                 "sti %0;" \
 149                 : \
 150                 : "d"(bfin_irq_flags) \
 151         )
 152
 153 #define local_irq_save_hw_notrace(x) __save_and_cli_hw(x)
 154
 155 #define local_irq_restore_hw_notrace(x)                 \
 156         do {                                            \
 157                 if (local_test_iflag_hw(x))             \
 158                         local_irq_enable_hw_notrace();  \
 159         } while (0)
 160
 161 #else /* CONFIG_IPIPE_TRACE_IRQSOFF */
 162
 163 #define local_irq_enable_hw() \
 164         __asm__ __volatile__( \
 165                 "sti %0;" \
 166                 : \
 167                 : "d"(bfin_irq_flags) \
 168         )
 169
 170 #define local_irq_disable_hw()                  \
 171         do {                                    \
 172                 int _tmp_dummy;                 \
 173                 __asm__ __volatile__ (          \
 174                         "cli %0;"               \
 175                         : "=d" (_tmp_dummy));   \
 176         } while (0)
 177
 178 #define local_irq_restore_hw(x) \
 179         do { \
 180                 if (irqs_enabled_from_flags_hw(x)) \
 181                         local_irq_enable_hw(); \
 182         } while (0)
 183
 184 #define local_irq_save_hw(x)            __save_and_cli_hw(x)
 185
 186 #define local_irq_disable_hw_notrace()  local_irq_disable_hw()
 187 #define local_irq_enable_hw_notrace()   local_irq_enable_hw()
 188 #define local_irq_save_hw_notrace(x)    local_irq_save_hw(x)
 189 #define local_irq_restore_hw_notrace(x) local_irq_restore_hw(x)
 190
 191 #endif  /* CONFIG_IPIPE_TRACE_IRQSOFF */
 192
 193 #else /* !CONFIG_IPIPE */
 194
 195 /*
 196  * Interrupt configuring macros.
 197  */
 198 #define local_irq_disable() \
 199         do { \
 200                 int __tmp_dummy; \
 201                 __asm__ __volatile__( \
 202                         "cli %0;" \
 203                         : "=d" (__tmp_dummy) \
 204                 ); \
 205         } while (0)
 206
 207 #define local_irq_enable() \
 208         __asm__ __volatile__( \
 209                 "sti %0;" \
 210                 : \
 211                 : "d" (bfin_irq_flags) \
 212         )
 213
 214 #ifdef CONFIG_DEBUG_HWERR
 215 # define __save_and_cli(x) \
 216         __asm__ __volatile__( \
 217                 "cli %0;" \
 218                 "sti %1;" \
 219                 : "=&d" (x) \
 220                 : "d" (0x3F) \
 221         )
 222 #else
 223 # define __save_and_cli(x) \
 224         __asm__ __volatile__( \
 225                 "cli %0;" \
 226                 : "=&d" (x) \
 227         )
 228 #endif
 229
 230 #define local_save_flags(x) \
 231         __asm__ __volatile__( \
 232                 "cli %0;" \
 233                 "sti %0;" \
 234                 : "=d" (x) \
 235         )
 236
 237 #ifdef CONFIG_DEBUG_HWERR
 238 #define irqs_enabled_from_flags(x) (((x) & ~0x3f) != 0)
 239 #else
 240 #define irqs_enabled_from_flags(x) ((x) != 0x1f)
 241 #endif
 242
 243 #define local_irq_restore(x) \
 244         do { \
 245                 if (irqs_enabled_from_flags(x)) \
 246                         local_irq_enable(); \
 247         } while (0)
 248
 249 /* For spinlocks etc */
 250 #define local_irq_save(x) __save_and_cli(x)
 251
 252 #define irqs_disabled()                         \
 253 ({                                              \
 254         unsigned long flags;                    \
 255         local_save_flags(flags);                \
 256         !irqs_enabled_from_flags(flags);        \
 257 })
 258
 259 #define local_irq_save_hw(x)            local_irq_save(x)
 260 #define local_irq_restore_hw(x)         local_irq_restore(x)
 261 #define local_irq_enable_hw()           local_irq_enable()
 262 #define local_irq_disable_hw()          local_irq_disable()
 263 #define irqs_disabled_hw()              irqs_disabled()
 264
 265 #endif /* !CONFIG_IPIPE */
 266
 267 #if ANOMALY_05000244 && defined(CONFIG_BFIN_ICACHE)
 268 # define NOP_PAD_ANOMALY_05000244 "nop; nop;"
 269 #else
 270 # define NOP_PAD_ANOMALY_05000244
 271 #endif
 272
 273 #define idle_with_irq_disabled() \
 274         __asm__ __volatile__( \
 275                 NOP_PAD_ANOMALY_05000244 \
 276                 ".align 8;" \
 277                 "sti %0;" \
 278                 "idle;" \
 279                 : \
 280                 : "d" (bfin_irq_flags) \
 281         )
 282
 283 static inline int irq_canonicalize(int irq)
 284 {
 285         return irq;
 286 }
 287
 288 #endif                          /* _BFIN_IRQ_H_ */