1 /* 2 * Copyright (c) 2015-2021, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <assert.h> 8 9 #include <arch.h> 10 #include <arch_helpers.h> 11 #include <common/debug.h> 12 #include <common/interrupt_props.h> 13 #include <drivers/arm/gic_common.h> 14 15 #include "../common/gic_common_private.h" 16 #include "gicv3_private.h" 17 18 /****************************************************************************** 19 * This function marks the core as awake in the re-distributor and 20 * ensures that the interface is active. 21 *****************************************************************************/ 22 void gicv3_rdistif_mark_core_awake(uintptr_t gicr_base) 23 { 24 /* 25 * The WAKER_PS_BIT should be changed to 0 26 * only when WAKER_CA_BIT is 1. 27 */ 28 assert((gicr_read_waker(gicr_base) & WAKER_CA_BIT) != 0U); 29 30 /* Mark the connected core as awake */ 31 gicr_write_waker(gicr_base, gicr_read_waker(gicr_base) & ~WAKER_PS_BIT); 32 33 /* Wait till the WAKER_CA_BIT changes to 0 */ 34 while ((gicr_read_waker(gicr_base) & WAKER_CA_BIT) != 0U) { 35 } 36 } 37 38 /****************************************************************************** 39 * This function marks the core as asleep in the re-distributor and ensures 40 * that the interface is quiescent. 41 *****************************************************************************/ 42 void gicv3_rdistif_mark_core_asleep(uintptr_t gicr_base) 43 { 44 /* Mark the connected core as asleep */ 45 gicr_write_waker(gicr_base, gicr_read_waker(gicr_base) | WAKER_PS_BIT); 46 47 /* Wait till the WAKER_CA_BIT changes to 1 */ 48 while ((gicr_read_waker(gicr_base) & WAKER_CA_BIT) == 0U) { 49 } 50 } 51 52 /******************************************************************************* 53 * This function probes the Redistributor frames when the driver is initialised 54 * and saves their base addresses. These base addresses are used later to 55 * initialise each Redistributor interface. 56 ******************************************************************************/ 57 void gicv3_rdistif_base_addrs_probe(uintptr_t *rdistif_base_addrs, 58 unsigned int rdistif_num, 59 uintptr_t gicr_base, 60 mpidr_hash_fn mpidr_to_core_pos) 61 { 62 u_register_t mpidr; 63 unsigned int proc_num; 64 uint64_t typer_val; 65 uintptr_t rdistif_base = gicr_base; 66 67 assert(rdistif_base_addrs != NULL); 68 69 /* 70 * Iterate over the Redistributor frames. Store the base address of each 71 * frame in the platform provided array. Use the "Processor Number" 72 * field to index into the array if the platform has not provided a hash 73 * function to convert an MPIDR (obtained from the "Affinity Value" 74 * field into a linear index. 75 */ 76 do { 77 typer_val = gicr_read_typer(rdistif_base); 78 if (mpidr_to_core_pos != NULL) { 79 mpidr = mpidr_from_gicr_typer(typer_val); 80 proc_num = mpidr_to_core_pos(mpidr); 81 } else { 82 proc_num = (typer_val >> TYPER_PROC_NUM_SHIFT) & 83 TYPER_PROC_NUM_MASK; 84 } 85 86 if (proc_num < rdistif_num) { 87 rdistif_base_addrs[proc_num] = rdistif_base; 88 } 89 90 rdistif_base += (1U << GICR_PCPUBASE_SHIFT); 91 } while ((typer_val & TYPER_LAST_BIT) == 0U); 92 } 93 94 /******************************************************************************* 95 * Helper function to configure the default attributes of (E)SPIs. 96 ******************************************************************************/ 97 void gicv3_spis_config_defaults(uintptr_t gicd_base) 98 { 99 unsigned int i, num_ints; 100 #if GIC_EXT_INTID 101 unsigned int num_eints; 102 #endif 103 unsigned int typer_reg = gicd_read_typer(gicd_base); 104 105 /* Maximum SPI INTID is 32 * (GICD_TYPER.ITLinesNumber + 1) - 1 */ 106 num_ints = ((typer_reg & TYPER_IT_LINES_NO_MASK) + 1U) << 5; 107 108 /* 109 * The GICv3 architecture allows GICD_TYPER.ITLinesNumber to be 31, so 110 * the maximum possible value for num_ints is 1024. Limit the value to 111 * MAX_SPI_ID + 1 to avoid getting wrong address in GICD_OFFSET() macro. 112 */ 113 if (num_ints > MAX_SPI_ID + 1U) { 114 num_ints = MAX_SPI_ID + 1U; 115 } 116 INFO("Maximum SPI INTID supported: %u\n", num_ints - 1); 117 118 /* Treat all (E)SPIs as G1NS by default. We do 32 at a time. */ 119 for (i = MIN_SPI_ID; i < num_ints; i += (1U << IGROUPR_SHIFT)) { 120 gicd_write_igroupr(gicd_base, i, ~0U); 121 } 122 123 #if GIC_EXT_INTID 124 /* Check if extended SPI range is implemented */ 125 if ((typer_reg & TYPER_ESPI) != 0U) { 126 /* 127 * Maximum ESPI INTID is 32 * (GICD_TYPER.ESPI_range + 1) + 4095 128 */ 129 num_eints = ((((typer_reg >> TYPER_ESPI_RANGE_SHIFT) & 130 TYPER_ESPI_RANGE_MASK) + 1U) << 5) + MIN_ESPI_ID; 131 INFO("Maximum ESPI INTID supported: %u\n", num_eints - 1); 132 133 for (i = MIN_ESPI_ID; i < num_eints; 134 i += (1U << IGROUPR_SHIFT)) { 135 gicd_write_igroupr(gicd_base, i, ~0U); 136 } 137 } else { 138 num_eints = 0U; 139 INFO("ESPI range is not implemented.\n"); 140 } 141 #endif 142 143 /* Setup the default (E)SPI priorities doing four at a time */ 144 for (i = MIN_SPI_ID; i < num_ints; i += (1U << IPRIORITYR_SHIFT)) { 145 gicd_write_ipriorityr(gicd_base, i, GICD_IPRIORITYR_DEF_VAL); 146 } 147 148 #if GIC_EXT_INTID 149 for (i = MIN_ESPI_ID; i < num_eints; 150 i += (1U << IPRIORITYR_SHIFT)) { 151 gicd_write_ipriorityr(gicd_base, i, GICD_IPRIORITYR_DEF_VAL); 152 } 153 #endif 154 /* 155 * Treat all (E)SPIs as level triggered by default, write 16 at a time 156 */ 157 for (i = MIN_SPI_ID; i < num_ints; i += (1U << ICFGR_SHIFT)) { 158 gicd_write_icfgr(gicd_base, i, 0U); 159 } 160 161 #if GIC_EXT_INTID 162 for (i = MIN_ESPI_ID; i < num_eints; i += (1U << ICFGR_SHIFT)) { 163 gicd_write_icfgr(gicd_base, i, 0U); 164 } 165 #endif 166 } 167 168 /******************************************************************************* 169 * Helper function to configure properties of secure (E)SPIs 170 ******************************************************************************/ 171 unsigned int gicv3_secure_spis_config_props(uintptr_t gicd_base, 172 const interrupt_prop_t *interrupt_props, 173 unsigned int interrupt_props_num) 174 { 175 unsigned int i; 176 const interrupt_prop_t *current_prop; 177 unsigned long long gic_affinity_val; 178 unsigned int ctlr_enable = 0U; 179 180 /* Make sure there's a valid property array */ 181 if (interrupt_props_num > 0U) { 182 assert(interrupt_props != NULL); 183 } 184 185 for (i = 0U; i < interrupt_props_num; i++) { 186 current_prop = &interrupt_props[i]; 187 188 unsigned int intr_num = current_prop->intr_num; 189 190 /* Skip SGI, (E)PPI and LPI interrupts */ 191 if (!IS_SPI(intr_num)) { 192 continue; 193 } 194 195 /* Configure this interrupt as a secure interrupt */ 196 gicd_clr_igroupr(gicd_base, intr_num); 197 198 /* Configure this interrupt as G0 or a G1S interrupt */ 199 assert((current_prop->intr_grp == INTR_GROUP0) || 200 (current_prop->intr_grp == INTR_GROUP1S)); 201 202 if (current_prop->intr_grp == INTR_GROUP1S) { 203 gicd_set_igrpmodr(gicd_base, intr_num); 204 ctlr_enable |= CTLR_ENABLE_G1S_BIT; 205 } else { 206 gicd_clr_igrpmodr(gicd_base, intr_num); 207 ctlr_enable |= CTLR_ENABLE_G0_BIT; 208 } 209 210 /* Set interrupt configuration */ 211 gicd_set_icfgr(gicd_base, intr_num, current_prop->intr_cfg); 212 213 /* Set the priority of this interrupt */ 214 gicd_set_ipriorityr(gicd_base, intr_num, 215 current_prop->intr_pri); 216 217 /* Target (E)SPIs to the primary CPU */ 218 gic_affinity_val = 219 gicd_irouter_val_from_mpidr(read_mpidr(), 0U); 220 gicd_write_irouter(gicd_base, intr_num, 221 gic_affinity_val); 222 223 /* Enable this interrupt */ 224 gicd_set_isenabler(gicd_base, intr_num); 225 } 226 227 return ctlr_enable; 228 } 229 230 /******************************************************************************* 231 * Helper function to configure the default attributes of (E)SPIs 232 ******************************************************************************/ 233 void gicv3_ppi_sgi_config_defaults(uintptr_t gicr_base) 234 { 235 unsigned int i, ppi_regs_num, regs_num; 236 237 #if GIC_EXT_INTID 238 /* Calculate number of PPI registers */ 239 ppi_regs_num = (unsigned int)((gicr_read_typer(gicr_base) >> 240 TYPER_PPI_NUM_SHIFT) & TYPER_PPI_NUM_MASK) + 1; 241 /* All other values except PPInum [0-2] are reserved */ 242 if (ppi_regs_num > 3U) { 243 ppi_regs_num = 1U; 244 } 245 #else 246 ppi_regs_num = 1U; 247 #endif 248 /* 249 * Disable all SGIs (imp. def.)/(E)PPIs before configuring them. 250 * This is a more scalable approach as it avoids clearing 251 * the enable bits in the GICD_CTLR. 252 */ 253 for (i = 0U; i < ppi_regs_num; ++i) { 254 gicr_write_icenabler(gicr_base, i, ~0U); 255 } 256 257 /* Wait for pending writes to GICR_ICENABLER */ 258 gicr_wait_for_pending_write(gicr_base); 259 260 /* 32 interrupt IDs per GICR_IGROUPR register */ 261 for (i = 0U; i < ppi_regs_num; ++i) { 262 /* Treat all SGIs/(E)PPIs as G1NS by default */ 263 gicr_write_igroupr(gicr_base, i, ~0U); 264 } 265 266 /* 4 interrupt IDs per GICR_IPRIORITYR register */ 267 regs_num = ppi_regs_num << 3; 268 for (i = 0U; i < regs_num; ++i) { 269 /* Setup the default (E)PPI/SGI priorities doing 4 at a time */ 270 gicr_write_ipriorityr(gicr_base, i, GICD_IPRIORITYR_DEF_VAL); 271 } 272 273 /* 16 interrupt IDs per GICR_ICFGR register */ 274 regs_num = ppi_regs_num << 1; 275 for (i = (MIN_PPI_ID >> ICFGR_SHIFT); i < regs_num; ++i) { 276 /* Configure all (E)PPIs as level triggered by default */ 277 gicr_write_icfgr(gicr_base, i, 0U); 278 } 279 } 280 281 /******************************************************************************* 282 * Helper function to configure properties of secure G0 and G1S (E)PPIs and SGIs 283 ******************************************************************************/ 284 unsigned int gicv3_secure_ppi_sgi_config_props(uintptr_t gicr_base, 285 const interrupt_prop_t *interrupt_props, 286 unsigned int interrupt_props_num) 287 { 288 unsigned int i; 289 const interrupt_prop_t *current_prop; 290 unsigned int ctlr_enable = 0U; 291 292 /* Make sure there's a valid property array */ 293 if (interrupt_props_num > 0U) { 294 assert(interrupt_props != NULL); 295 } 296 297 for (i = 0U; i < interrupt_props_num; i++) { 298 current_prop = &interrupt_props[i]; 299 300 unsigned int intr_num = current_prop->intr_num; 301 302 /* Skip (E)SPI interrupt */ 303 if (!IS_SGI_PPI(intr_num)) { 304 continue; 305 } 306 307 /* Configure this interrupt as a secure interrupt */ 308 gicr_clr_igroupr(gicr_base, intr_num); 309 310 /* Configure this interrupt as G0 or a G1S interrupt */ 311 assert((current_prop->intr_grp == INTR_GROUP0) || 312 (current_prop->intr_grp == INTR_GROUP1S)); 313 314 if (current_prop->intr_grp == INTR_GROUP1S) { 315 gicr_set_igrpmodr(gicr_base, intr_num); 316 ctlr_enable |= CTLR_ENABLE_G1S_BIT; 317 } else { 318 gicr_clr_igrpmodr(gicr_base, intr_num); 319 ctlr_enable |= CTLR_ENABLE_G0_BIT; 320 } 321 322 /* Set the priority of this interrupt */ 323 gicr_set_ipriorityr(gicr_base, intr_num, 324 current_prop->intr_pri); 325 326 /* 327 * Set interrupt configuration for (E)PPIs. 328 * Configurations for SGIs 0-15 are ignored. 329 */ 330 if (intr_num >= MIN_PPI_ID) { 331 gicr_set_icfgr(gicr_base, intr_num, 332 current_prop->intr_cfg); 333 } 334 335 /* Enable this interrupt */ 336 gicr_set_isenabler(gicr_base, intr_num); 337 } 338 339 return ctlr_enable; 340 } 341 342 /** 343 * gicv3_rdistif_get_number_frames() - determine size of GICv3 GICR region 344 * @gicr_frame: base address of the GICR region to check 345 * 346 * This iterates over the GICR_TYPER registers of multiple GICR frames in 347 * a GICR region, to find the instance which has the LAST bit set. For most 348 * systems this corresponds to the number of cores handled by a redistributor, 349 * but there could be disabled cores among them. 350 * It assumes that each GICR region is fully accessible (till the LAST bit 351 * marks the end of the region). 352 * If a platform has multiple GICR regions, this function would need to be 353 * called multiple times, providing the respective GICR base address each time. 354 * 355 * Return: number of valid GICR frames (at least 1, up to PLATFORM_CORE_COUNT) 356 ******************************************************************************/ 357 unsigned int gicv3_rdistif_get_number_frames(const uintptr_t gicr_frame) 358 { 359 uintptr_t rdistif_base = gicr_frame; 360 unsigned int count; 361 362 for (count = 1; count < PLATFORM_CORE_COUNT; count++) { 363 if ((gicr_read_typer(rdistif_base) & TYPER_LAST_BIT) != 0U) { 364 break; 365 } 366 rdistif_base += (1U << GICR_PCPUBASE_SHIFT); 367 } 368 369 return count; 370 } 371