arch/mips/include/asm/mips-gic.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * Copyright (C) 2017 Imagination Technologies
   4  * Author: Paul Burton <paul.burton@mips.com>
   5  */
   6
   7 #ifndef __MIPS_ASM_MIPS_CPS_H__
   8 # error Please include asm/mips-cps.h rather than asm/mips-gic.h
   9 #endif
  10
  11 #ifndef __MIPS_ASM_MIPS_GIC_H__
  12 #define __MIPS_ASM_MIPS_GIC_H__
  13
  14 #include <linux/bitops.h>
  15
  16 /* The base address of the GIC registers */
  17 extern void __iomem *mips_gic_base;
  18
  19 /* Offsets from the GIC base address to various control blocks */
  20 #define MIPS_GIC_SHARED_OFS     0x00000
  21 #define MIPS_GIC_SHARED_SZ      0x08000
  22 #define MIPS_GIC_LOCAL_OFS      0x08000
  23 #define MIPS_GIC_LOCAL_SZ       0x04000
  24 #define MIPS_GIC_REDIR_OFS      0x0c000
  25 #define MIPS_GIC_REDIR_SZ       0x04000
  26 #define MIPS_GIC_USER_OFS       0x10000
  27 #define MIPS_GIC_USER_SZ        0x10000
  28
  29 /* For read-only shared registers */
  30 #define GIC_ACCESSOR_RO(sz, off, name)                                  \
  31         CPS_ACCESSOR_RO(gic, sz, MIPS_GIC_SHARED_OFS + off, name)
  32
  33 /* For read-write shared registers */
  34 #define GIC_ACCESSOR_RW(sz, off, name)                                  \
  35         CPS_ACCESSOR_RW(gic, sz, MIPS_GIC_SHARED_OFS + off, name)
  36
  37 /* For read-only local registers */
  38 #define GIC_VX_ACCESSOR_RO(sz, off, name)                               \
  39         CPS_ACCESSOR_RO(gic, sz, MIPS_GIC_LOCAL_OFS + off, vl_##name)   \
  40         CPS_ACCESSOR_RO(gic, sz, MIPS_GIC_REDIR_OFS + off, vo_##name)
  41
  42 /* For read-write local registers */
  43 #define GIC_VX_ACCESSOR_RW(sz, off, name)                               \
  44         CPS_ACCESSOR_RW(gic, sz, MIPS_GIC_LOCAL_OFS + off, vl_##name)   \
  45         CPS_ACCESSOR_RW(gic, sz, MIPS_GIC_REDIR_OFS + off, vo_##name)
  46
  47 /* For read-only shared per-interrupt registers */
  48 #define GIC_ACCESSOR_RO_INTR_REG(sz, off, stride, name)                 \
  49 static inline void __iomem *addr_gic_##name(unsigned int intr)          \
  50 {                                                                       \
  51         return mips_gic_base + (off) + (intr * (stride));               \
  52 }                                                                       \
  53                                                                         \
  54 static inline unsigned int read_gic_##name(unsigned int intr)           \
  55 {                                                                       \
  56         BUILD_BUG_ON(sz != 32);                                         \
  57         return __raw_readl(addr_gic_##name(intr));                      \
  58 }
  59
  60 /* For read-write shared per-interrupt registers */
  61 #define GIC_ACCESSOR_RW_INTR_REG(sz, off, stride, name)                 \
  62         GIC_ACCESSOR_RO_INTR_REG(sz, off, stride, name)                 \
  63                                                                         \
  64 static inline void write_gic_##name(unsigned int intr,                  \
  65                                     unsigned int val)                   \
  66 {                                                                       \
  67         BUILD_BUG_ON(sz != 32);                                         \
  68         __raw_writel(val, addr_gic_##name(intr));                       \
  69 }
  70
  71 /* For read-only local per-interrupt registers */
  72 #define GIC_VX_ACCESSOR_RO_INTR_REG(sz, off, stride, name)              \
  73         GIC_ACCESSOR_RO_INTR_REG(sz, MIPS_GIC_LOCAL_OFS + off,          \
  74                                  stride, vl_##name)                     \
  75         GIC_ACCESSOR_RO_INTR_REG(sz, MIPS_GIC_REDIR_OFS + off,          \
  76                                  stride, vo_##name)
  77
  78 /* For read-write local per-interrupt registers */
  79 #define GIC_VX_ACCESSOR_RW_INTR_REG(sz, off, stride, name)              \
  80         GIC_ACCESSOR_RW_INTR_REG(sz, MIPS_GIC_LOCAL_OFS + off,          \
  81                                  stride, vl_##name)                     \
  82         GIC_ACCESSOR_RW_INTR_REG(sz, MIPS_GIC_REDIR_OFS + off,          \
  83                                  stride, vo_##name)
  84
  85 /* For read-only shared bit-per-interrupt registers */
  86 #define GIC_ACCESSOR_RO_INTR_BIT(off, name)                             \
  87 static inline void __iomem *addr_gic_##name(void)                       \
  88 {                                                                       \
  89         return mips_gic_base + (off);                                   \
  90 }                                                                       \
  91                                                                         \
  92 static inline unsigned int read_gic_##name(unsigned int intr)           \
  93 {                                                                       \
  94         void __iomem *addr = addr_gic_##name();                         \
  95         unsigned int val;                                               \
  96                                                                         \
  97         if (mips_cm_is64) {                                             \
  98                 addr += (intr / 64) * sizeof(uint64_t);                 \
  99                 val = __raw_readq(addr) >> intr % 64;                   \
 100         } else {                                                        \
 101                 addr += (intr / 32) * sizeof(uint32_t);                 \
 102                 val = __raw_readl(addr) >> intr % 32;                   \
 103         }                                                               \
 104                                                                         \
 105         return val & 0x1;                                               \
 106 }
 107
 108 /* For read-write shared bit-per-interrupt registers */
 109 #define GIC_ACCESSOR_RW_INTR_BIT(off, name)                             \
 110         GIC_ACCESSOR_RO_INTR_BIT(off, name)                             \
 111                                                                         \
 112 static inline void write_gic_##name(unsigned int intr)                  \
 113 {                                                                       \
 114         void __iomem *addr = addr_gic_##name();                         \
 115                                                                         \
 116         if (mips_cm_is64) {                                             \
 117                 addr += (intr / 64) * sizeof(uint64_t);                 \
 118                 __raw_writeq(BIT(intr % 64), addr);                     \
 119         } else {                                                        \
 120                 addr += (intr / 32) * sizeof(uint32_t);                 \
 121                 __raw_writel(BIT(intr % 32), addr);                     \
 122         }                                                               \
 123 }                                                                       \
 124                                                                         \
 125 static inline void change_gic_##name(unsigned int intr,                 \
 126                                      unsigned int val)                  \
 127 {                                                                       \
 128         void __iomem *addr = addr_gic_##name();                         \
 129                                                                         \
 130         if (mips_cm_is64) {                                             \
 131                 uint64_t _val;                                          \
 132                                                                         \
 133                 addr += (intr / 64) * sizeof(uint64_t);                 \
 134                 _val = __raw_readq(addr);                               \
 135                 _val &= ~BIT_ULL(intr % 64);                            \
 136                 _val |= (uint64_t)val << (intr % 64);                   \
 137                 __raw_writeq(_val, addr);                               \
 138         } else {                                                        \
 139                 uint32_t _val;                                          \
 140                                                                         \
 141                 addr += (intr / 32) * sizeof(uint32_t);                 \
 142                 _val = __raw_readl(addr);                               \
 143                 _val &= ~BIT(intr % 32);                                \
 144                 _val |= val << (intr % 32);                             \
 145                 __raw_writel(_val, addr);                               \
 146         }                                                               \
 147 }
 148
 149 /* For read-only local bit-per-interrupt registers */
 150 #define GIC_VX_ACCESSOR_RO_INTR_BIT(sz, off, name)                      \
 151         GIC_ACCESSOR_RO_INTR_BIT(sz, MIPS_GIC_LOCAL_OFS + off,          \
 152                                  vl_##name)                             \
 153         GIC_ACCESSOR_RO_INTR_BIT(sz, MIPS_GIC_REDIR_OFS + off,          \
 154                                  vo_##name)
 155
 156 /* For read-write local bit-per-interrupt registers */
 157 #define GIC_VX_ACCESSOR_RW_INTR_BIT(sz, off, name)                      \
 158         GIC_ACCESSOR_RW_INTR_BIT(sz, MIPS_GIC_LOCAL_OFS + off,          \
 159                                  vl_##name)                             \
 160         GIC_ACCESSOR_RW_INTR_BIT(sz, MIPS_GIC_REDIR_OFS + off,          \
 161                                  vo_##name)
 162
 163 /* GIC_SH_CONFIG - Information about the GIC configuration */
 164 GIC_ACCESSOR_RW(32, 0x000, config)
 165 #define GIC_CONFIG_COUNTSTOP            BIT(28)
 166 #define GIC_CONFIG_COUNTBITS            GENMASK(27, 24)
 167 #define GIC_CONFIG_NUMINTERRUPTS        GENMASK(23, 16)
 168 #define GIC_CONFIG_PVPS                 GENMASK(6, 0)
 169
 170 /* GIC_SH_COUNTER - Shared global counter value */
 171 GIC_ACCESSOR_RW(64, 0x010, counter)
 172 GIC_ACCESSOR_RW(32, 0x010, counter_32l)
 173 GIC_ACCESSOR_RW(32, 0x014, counter_32h)
 174
 175 /* GIC_SH_POL_* - Configures interrupt polarity */
 176 GIC_ACCESSOR_RW_INTR_BIT(0x100, pol)
 177 #define GIC_POL_ACTIVE_LOW              0       /* when level triggered */
 178 #define GIC_POL_ACTIVE_HIGH             1       /* when level triggered */
 179 #define GIC_POL_FALLING_EDGE            0       /* when single-edge triggered */
 180 #define GIC_POL_RISING_EDGE             1       /* when single-edge triggered */
 181
 182 /* GIC_SH_TRIG_* - Configures interrupts to be edge or level triggered */
 183 GIC_ACCESSOR_RW_INTR_BIT(0x180, trig)
 184 #define GIC_TRIG_LEVEL                  0
 185 #define GIC_TRIG_EDGE                   1
 186
 187 /* GIC_SH_DUAL_* - Configures whether interrupts trigger on both edges */
 188 GIC_ACCESSOR_RW_INTR_BIT(0x200, dual)
 189 #define GIC_DUAL_SINGLE                 0       /* when edge-triggered */
 190 #define GIC_DUAL_DUAL                   1       /* when edge-triggered */
 191
 192 /* GIC_SH_WEDGE - Write an 'edge', ie. trigger an interrupt */
 193 GIC_ACCESSOR_RW(32, 0x280, wedge)
 194 #define GIC_WEDGE_RW                    BIT(31)
 195 #define GIC_WEDGE_INTR                  GENMASK(7, 0)
 196
 197 /* GIC_SH_RMASK_* - Reset/clear shared interrupt mask bits */
 198 GIC_ACCESSOR_RW_INTR_BIT(0x300, rmask)
 199
 200 /* GIC_SH_SMASK_* - Set shared interrupt mask bits */
 201 GIC_ACCESSOR_RW_INTR_BIT(0x380, smask)
 202
 203 /* GIC_SH_MASK_* - Read the current shared interrupt mask */
 204 GIC_ACCESSOR_RO_INTR_BIT(0x400, mask)
 205
 206 /* GIC_SH_PEND_* - Read currently pending shared interrupts */
 207 GIC_ACCESSOR_RO_INTR_BIT(0x480, pend)
 208
 209 /* GIC_SH_MAPx_PIN - Map shared interrupts to a particular CPU pin */
 210 GIC_ACCESSOR_RW_INTR_REG(32, 0x500, 0x4, map_pin)
 211 #define GIC_MAP_PIN_MAP_TO_PIN          BIT(31)
 212 #define GIC_MAP_PIN_MAP_TO_NMI          BIT(30)
 213 #define GIC_MAP_PIN_MAP                 GENMASK(5, 0)
 214
 215 /* GIC_SH_MAPx_VP - Map shared interrupts to a particular Virtual Processor */
 216 GIC_ACCESSOR_RW_INTR_REG(32, 0x2000, 0x20, map_vp)
 217
 218 /* GIC_Vx_CTL - VP-level interrupt control */
 219 GIC_VX_ACCESSOR_RW(32, 0x000, ctl)
 220 #define GIC_VX_CTL_FDC_ROUTABLE         BIT(4)
 221 #define GIC_VX_CTL_SWINT_ROUTABLE       BIT(3)
 222 #define GIC_VX_CTL_PERFCNT_ROUTABLE     BIT(2)
 223 #define GIC_VX_CTL_TIMER_ROUTABLE       BIT(1)
 224 #define GIC_VX_CTL_EIC                  BIT(0)
 225
 226 /* GIC_Vx_PEND - Read currently pending local interrupts */
 227 GIC_VX_ACCESSOR_RO(32, 0x004, pend)
 228
 229 /* GIC_Vx_MASK - Read the current local interrupt mask */
 230 GIC_VX_ACCESSOR_RO(32, 0x008, mask)
 231
 232 /* GIC_Vx_RMASK - Reset/clear local interrupt mask bits */
 233 GIC_VX_ACCESSOR_RW(32, 0x00c, rmask)
 234
 235 /* GIC_Vx_SMASK - Set local interrupt mask bits */
 236 GIC_VX_ACCESSOR_RW(32, 0x010, smask)
 237
 238 /* GIC_Vx_*_MAP - Route local interrupts to the desired pins */
 239 GIC_VX_ACCESSOR_RW_INTR_REG(32, 0x040, 0x4, map)
 240
 241 /* GIC_Vx_WD_MAP - Route the local watchdog timer interrupt */
 242 GIC_VX_ACCESSOR_RW(32, 0x040, wd_map)
 243
 244 /* GIC_Vx_COMPARE_MAP - Route the local count/compare interrupt */
 245 GIC_VX_ACCESSOR_RW(32, 0x044, compare_map)
 246
 247 /* GIC_Vx_TIMER_MAP - Route the local CPU timer (cp0 count/compare) interrupt */
 248 GIC_VX_ACCESSOR_RW(32, 0x048, timer_map)
 249
 250 /* GIC_Vx_FDC_MAP - Route the local fast debug channel interrupt */
 251 GIC_VX_ACCESSOR_RW(32, 0x04c, fdc_map)
 252
 253 /* GIC_Vx_PERFCTR_MAP - Route the local performance counter interrupt */
 254 GIC_VX_ACCESSOR_RW(32, 0x050, perfctr_map)
 255
 256 /* GIC_Vx_SWINT0_MAP - Route the local software interrupt 0 */
 257 GIC_VX_ACCESSOR_RW(32, 0x054, swint0_map)
 258
 259 /* GIC_Vx_SWINT1_MAP - Route the local software interrupt 1 */
 260 GIC_VX_ACCESSOR_RW(32, 0x058, swint1_map)
 261
 262 /* GIC_Vx_OTHER - Configure access to other Virtual Processor registers */
 263 GIC_VX_ACCESSOR_RW(32, 0x080, other)
 264 #define GIC_VX_OTHER_VPNUM              GENMASK(5, 0)
 265
 266 /* GIC_Vx_IDENT - Retrieve the local Virtual Processor's ID */
 267 GIC_VX_ACCESSOR_RO(32, 0x088, ident)
 268 #define GIC_VX_IDENT_VPNUM              GENMASK(5, 0)
 269
 270 /* GIC_Vx_COMPARE - Value to compare with GIC_SH_COUNTER */
 271 GIC_VX_ACCESSOR_RW(64, 0x0a0, compare)
 272
 273 /* GIC_Vx_EIC_SHADOW_SET_BASE - Set shadow register set for each interrupt */
 274 GIC_VX_ACCESSOR_RW_INTR_REG(32, 0x100, 0x4, eic_shadow_set)
 275
 276 /**
 277  * enum mips_gic_local_interrupt - GIC local interrupts
 278  * @GIC_LOCAL_INT_WD: GIC watchdog timer interrupt
 279  * @GIC_LOCAL_INT_COMPARE: GIC count/compare interrupt
 280  * @GIC_LOCAL_INT_TIMER: CP0 count/compare interrupt
 281  * @GIC_LOCAL_INT_PERFCTR: Performance counter interrupt
 282  * @GIC_LOCAL_INT_SWINT0: Software interrupt 0
 283  * @GIC_LOCAL_INT_SWINT1: Software interrupt 1
 284  * @GIC_LOCAL_INT_FDC: Fast debug channel interrupt
 285  * @GIC_NUM_LOCAL_INTRS: The number of local interrupts
 286  *
 287  * Enumerates interrupts provided by the GIC that are local to a VP.
 288  */
 289 enum mips_gic_local_interrupt {
 290         GIC_LOCAL_INT_WD,
 291         GIC_LOCAL_INT_COMPARE,
 292         GIC_LOCAL_INT_TIMER,
 293         GIC_LOCAL_INT_PERFCTR,
 294         GIC_LOCAL_INT_SWINT0,
 295         GIC_LOCAL_INT_SWINT1,
 296         GIC_LOCAL_INT_FDC,
 297         GIC_NUM_LOCAL_INTRS
 298 };
 299
 300 /**
 301  * mips_gic_present() - Determine whether a GIC is present
 302  *
 303  * Determines whether a MIPS Global Interrupt Controller (GIC) is present in
 304  * the system that the kernel is running on.
 305  *
 306  * Return true if a GIC is present, else false.
 307  */
 308 static inline bool mips_gic_present(void)
 309 {
 310         return IS_ENABLED(CONFIG_MIPS_GIC) && mips_gic_base;
 311 }
 312
 313 /**
 314  * mips_gic_vx_map_reg() - Return GIC_Vx_<intr>_MAP register offset
 315  * @intr: A GIC local interrupt
 316  *
 317  * Determine the index of the GIC_VL_<intr>_MAP or GIC_VO_<intr>_MAP register
 318  * within the block of GIC map registers. This is almost the same as the order
 319  * of interrupts in the pending & mask registers, as used by enum
 320  * mips_gic_local_interrupt, but moves the FDC interrupt & thus offsets the
 321  * interrupts after it...
 322  *
 323  * Return: The map register index corresponding to @intr.
 324  *
 325  * The return value is suitable for use with the (read|write)_gic_v[lo]_map
 326  * accessor functions.
 327  */
 328 static inline unsigned int
 329 mips_gic_vx_map_reg(enum mips_gic_local_interrupt intr)
 330 {
 331         /* WD, Compare & Timer are 1:1 */
 332         if (intr <= GIC_LOCAL_INT_TIMER)
 333                 return intr;
 334
 335         /* FDC moves to after Timer... */
 336         if (intr == GIC_LOCAL_INT_FDC)
 337                 return GIC_LOCAL_INT_TIMER + 1;
 338
 339         /* As a result everything else is offset by 1 */
 340         return intr + 1;
 341 }
 342
 343 /**
 344  * gic_get_c0_compare_int() - Return cp0 count/compare interrupt virq
 345  *
 346  * Determine the virq number to use for the coprocessor 0 count/compare
 347  * interrupt, which may be routed via the GIC.
 348  *
 349  * Returns the virq number or a negative error number.
 350  */
 351 extern int gic_get_c0_compare_int(void);
 352
 353 /**
 354  * gic_get_c0_perfcount_int() - Return performance counter interrupt virq
 355  *
 356  * Determine the virq number to use for CPU performance counter interrupts,
 357  * which may be routed via the GIC.
 358  *
 359  * Returns the virq number or a negative error number.
 360  */
 361 extern int gic_get_c0_perfcount_int(void);
 362
 363 /**
 364  * gic_get_c0_fdc_int() - Return fast debug channel interrupt virq
 365  *
 366  * Determine the virq number to use for fast debug channel (FDC) interrupts,
 367  * which may be routed via the GIC.
 368  *
 369  * Returns the virq number or a negative error number.
 370  */
 371 extern int gic_get_c0_fdc_int(void);
 372
 373 #endif /* __MIPS_ASM_MIPS_CPS_H__ */