arch/blackfin/include/asm/irqflags.h

   1 /*
   2  * interface to Blackfin CEC
   3  *
   4  * Copyright 2009 Analog Devices Inc.
   5  * Licensed under the GPL-2 or later.
   6  */
   7
   8 #ifndef __ASM_BFIN_IRQFLAGS_H__
   9 #define __ASM_BFIN_IRQFLAGS_H__
  10
  11 #include <mach/blackfin.h>
  12
  13 #ifdef CONFIG_SMP
  14 # include <asm/pda.h>
  15 # include <asm/processor.h>
  16 # define bfin_irq_flags cpu_pda[blackfin_core_id()].imask
  17 #else
  18 extern unsigned long bfin_irq_flags;
  19 #endif
  20
  21 static inline notrace void bfin_sti(unsigned long flags)
  22 {
  23         asm volatile("sti %0;" : : "d" (flags));
  24 }
  25
  26 static inline notrace unsigned long bfin_cli(void)
  27 {
  28         unsigned long flags;
  29         asm volatile("cli %0;" : "=d" (flags));
  30         return flags;
  31 }
  32
  33 #ifdef CONFIG_DEBUG_HWERR
  34 # define bfin_no_irqs 0x3f
  35 #else
  36 # define bfin_no_irqs 0x1f
  37 #endif
  38
  39 /*****************************************************************************/
  40 /*
  41  * Hard, untraced CPU interrupt flag manipulation and access.
  42  */
  43 static inline notrace void __hard_local_irq_disable(void)
  44 {
  45         bfin_cli();
  46 }
  47
  48 static inline notrace void __hard_local_irq_enable(void)
  49 {
  50         bfin_sti(bfin_irq_flags);
  51 }
  52
  53 static inline notrace unsigned long hard_local_save_flags(void)
  54 {
  55         return bfin_read_IMASK();
  56 }
  57
  58 static inline notrace unsigned long __hard_local_irq_save(void)
  59 {
  60         unsigned long flags;
  61         flags = bfin_cli();
  62 #ifdef CONFIG_DEBUG_HWERR
  63         bfin_sti(0x3f);
  64 #endif
  65         return flags;
  66 }
  67
  68 static inline notrace int hard_irqs_disabled_flags(unsigned long flags)
  69 {
  70         return (flags & ~0x3f) == 0;
  71 }
  72
  73 static inline notrace int hard_irqs_disabled(void)
  74 {
  75         unsigned long flags = hard_local_save_flags();
  76         return hard_irqs_disabled_flags(flags);
  77 }
  78
  79 static inline notrace void __hard_local_irq_restore(unsigned long flags)
  80 {
  81         if (!hard_irqs_disabled_flags(flags))
  82                 __hard_local_irq_enable();
  83 }
  84
  85 /*****************************************************************************/
  86 /*
  87  * Interrupt pipe handling.
  88  */
  89 #ifdef CONFIG_IPIPE
  90
  91 #include <linux/compiler.h>
  92 #include <linux/ipipe_trace.h>
  93 /*
  94  * Way too many inter-deps between low-level headers in this port, so
  95  * we redeclare the required bits we cannot pick from
  96  * <asm/ipipe_base.h> to prevent circular dependencies.
  97  */
  98 void __ipipe_stall_root(void);
  99 void __ipipe_unstall_root(void);
 100 unsigned long __ipipe_test_root(void);
 101 unsigned long __ipipe_test_and_stall_root(void);
 102 void __ipipe_restore_root(unsigned long flags);
 103
 104 #ifdef CONFIG_IPIPE_DEBUG_CONTEXT
 105 struct ipipe_domain;
 106 extern struct ipipe_domain ipipe_root;
 107 void ipipe_check_context(struct ipipe_domain *ipd);
 108 #define __check_irqop_context(ipd)  ipipe_check_context(&ipipe_root)
 109 #else /* !CONFIG_IPIPE_DEBUG_CONTEXT */
 110 #define __check_irqop_context(ipd)  do { } while (0)
 111 #endif /* !CONFIG_IPIPE_DEBUG_CONTEXT */
 112
 113 /*
 114  * Interrupt pipe interface to linux/irqflags.h.
 115  */
 116 static inline notrace void arch_local_irq_disable(void)
 117 {
 118         __check_irqop_context();
 119         __ipipe_stall_root();
 120         barrier();
 121 }
 122
 123 static inline notrace void arch_local_irq_enable(void)
 124 {
 125         barrier();
 126         __check_irqop_context();
 127         __ipipe_unstall_root();
 128 }
 129
 130 static inline notrace unsigned long arch_local_save_flags(void)
 131 {
 132         return __ipipe_test_root() ? bfin_no_irqs : bfin_irq_flags;
 133 }
 134
 135 static inline notrace int arch_irqs_disabled_flags(unsigned long flags)
 136 {
 137         return flags == bfin_no_irqs;
 138 }
 139
 140 static inline notrace unsigned long arch_local_irq_save(void)
 141 {
 142         unsigned long flags;
 143
 144         __check_irqop_context();
 145         flags = __ipipe_test_and_stall_root() ? bfin_no_irqs : bfin_irq_flags;
 146         barrier();
 147
 148         return flags;
 149 }
 150
 151 static inline notrace void arch_local_irq_restore(unsigned long flags)
 152 {
 153         __check_irqop_context();
 154         __ipipe_restore_root(flags == bfin_no_irqs);
 155 }
 156
 157 static inline notrace unsigned long arch_mangle_irq_bits(int virt, unsigned long real)
 158 {
 159         /*
 160          * Merge virtual and real interrupt mask bits into a single
 161          * 32bit word.
 162          */
 163         return (real & ~(1 << 31)) | ((virt != 0) << 31);
 164 }
 165
 166 static inline notrace int arch_demangle_irq_bits(unsigned long *x)
 167 {
 168         int virt = (*x & (1 << 31)) != 0;
 169         *x &= ~(1L << 31);
 170         return virt;
 171 }
 172
 173 /*
 174  * Interface to various arch routines that may be traced.
 175  */
 176 #ifdef CONFIG_IPIPE_TRACE_IRQSOFF
 177 static inline notrace void hard_local_irq_disable(void)
 178 {
 179         if (!hard_irqs_disabled()) {
 180                 __hard_local_irq_disable();
 181                 ipipe_trace_begin(0x80000000);
 182         }
 183 }
 184
 185 static inline notrace void hard_local_irq_enable(void)
 186 {
 187         if (hard_irqs_disabled()) {
 188                 ipipe_trace_end(0x80000000);
 189                 __hard_local_irq_enable();
 190         }
 191 }
 192
 193 static inline notrace unsigned long hard_local_irq_save(void)
 194 {
 195         unsigned long flags = hard_local_save_flags();
 196         if (!hard_irqs_disabled_flags(flags)) {
 197                 __hard_local_irq_disable();
 198                 ipipe_trace_begin(0x80000001);
 199         }
 200         return flags;
 201 }
 202
 203 static inline notrace void hard_local_irq_restore(unsigned long flags)
 204 {
 205         if (!hard_irqs_disabled_flags(flags)) {
 206                 ipipe_trace_end(0x80000001);
 207                 __hard_local_irq_enable();
 208         }
 209 }
 210
 211 #else /* !CONFIG_IPIPE_TRACE_IRQSOFF */
 212 # define hard_local_irq_disable()       __hard_local_irq_disable()
 213 # define hard_local_irq_enable()        __hard_local_irq_enable()
 214 # define hard_local_irq_save()          __hard_local_irq_save()
 215 # define hard_local_irq_restore(flags)  __hard_local_irq_restore(flags)
 216 #endif /* !CONFIG_IPIPE_TRACE_IRQSOFF */
 217
 218 #define hard_local_irq_save_cond()              hard_local_irq_save()
 219 #define hard_local_irq_restore_cond(flags)      hard_local_irq_restore(flags)
 220
 221 #else /* !CONFIG_IPIPE */
 222
 223 /*
 224  * Direct interface to linux/irqflags.h.
 225  */
 226 #define arch_local_save_flags()         hard_local_save_flags()
 227 #define arch_local_irq_save(flags)      __hard_local_irq_save()
 228 #define arch_local_irq_restore(flags)   __hard_local_irq_restore(flags)
 229 #define arch_local_irq_enable()         __hard_local_irq_enable()
 230 #define arch_local_irq_disable()        __hard_local_irq_disable()
 231 #define arch_irqs_disabled_flags(flags) hard_irqs_disabled_flags(flags)
 232 #define arch_irqs_disabled()            hard_irqs_disabled()
 233
 234 /*
 235  * Interface to various arch routines that may be traced.
 236  */
 237 #define hard_local_irq_save()           __hard_local_irq_save()
 238 #define hard_local_irq_restore(flags)   __hard_local_irq_restore(flags)
 239 #define hard_local_irq_enable()         __hard_local_irq_enable()
 240 #define hard_local_irq_disable()        __hard_local_irq_disable()
 241 #define hard_local_irq_save_cond()              hard_local_save_flags()
 242 #define hard_local_irq_restore_cond(flags)      do { (void)(flags); } while (0)
 243
 244 #endif /* !CONFIG_IPIPE */
 245
 246 #ifdef CONFIG_SMP
 247 #define hard_local_irq_save_smp()               hard_local_irq_save()
 248 #define hard_local_irq_restore_smp(flags)       hard_local_irq_restore(flags)
 249 #else
 250 #define hard_local_irq_save_smp()               hard_local_save_flags()
 251 #define hard_local_irq_restore_smp(flags)       do { (void)(flags); } while (0)
 252 #endif
 253
 254 /*
 255  * Remap the arch-neutral IRQ state manipulation macros to the
 256  * blackfin-specific hard_local_irq_* API.
 257  */
 258 #define local_irq_save_hw(flags)                        \
 259         do {                                            \
 260                 (flags) = hard_local_irq_save();        \
 261         } while (0)
 262 #define local_irq_restore_hw(flags)             \
 263         do {                                    \
 264                 hard_local_irq_restore(flags);  \
 265         } while (0)
 266 #define local_irq_disable_hw()                  \
 267         do {                                    \
 268                 hard_local_irq_disable();       \
 269         } while (0)
 270 #define local_irq_enable_hw()                   \
 271         do {                                    \
 272                 hard_local_irq_enable();        \
 273         } while (0)
 274 #define local_irq_save_hw_notrace(flags)                \
 275         do {                                            \
 276                 (flags) = __hard_local_irq_save();      \
 277         } while (0)
 278 #define local_irq_restore_hw_notrace(flags)             \
 279         do {                                            \
 280                 __hard_local_irq_restore(flags);        \
 281         } while (0)
 282
 283 #define irqs_disabled_hw()      hard_irqs_disabled()
 284
 285 #endif