Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013, 2014 ARM Limited, All Rights Reserved. |
| 3 | * Author: Marc Zyngier <marc.zyngier@arm.com> |
| 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 version 2 as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 16 | */ |
| 17 | |
| 18 | #include <linux/cpu.h> |
Sudeep Holla | 3708d52 | 2014-08-26 16:03:35 +0100 | [diff] [blame] | 19 | #include <linux/cpu_pm.h> |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 20 | #include <linux/delay.h> |
| 21 | #include <linux/interrupt.h> |
| 22 | #include <linux/of.h> |
| 23 | #include <linux/of_address.h> |
| 24 | #include <linux/of_irq.h> |
| 25 | #include <linux/percpu.h> |
| 26 | #include <linux/slab.h> |
| 27 | |
Joel Porquet | 41a83e0 | 2015-07-07 17:11:46 -0400 | [diff] [blame] | 28 | #include <linux/irqchip.h> |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 29 | #include <linux/irqchip/arm-gic-v3.h> |
| 30 | |
| 31 | #include <asm/cputype.h> |
| 32 | #include <asm/exception.h> |
| 33 | #include <asm/smp_plat.h> |
Marc Zyngier | 0b6a3da | 2015-08-26 17:00:42 +0100 | [diff] [blame] | 34 | #include <asm/virt.h> |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 35 | |
| 36 | #include "irq-gic-common.h" |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 37 | |
Marc Zyngier | f5c1434 | 2014-11-24 14:35:10 +0000 | [diff] [blame] | 38 | struct redist_region { |
| 39 | void __iomem *redist_base; |
| 40 | phys_addr_t phys_base; |
| 41 | }; |
| 42 | |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 43 | struct gic_chip_data { |
| 44 | void __iomem *dist_base; |
Marc Zyngier | f5c1434 | 2014-11-24 14:35:10 +0000 | [diff] [blame] | 45 | struct redist_region *redist_regions; |
| 46 | struct rdists rdists; |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 47 | struct irq_domain *domain; |
| 48 | u64 redist_stride; |
Marc Zyngier | f5c1434 | 2014-11-24 14:35:10 +0000 | [diff] [blame] | 49 | u32 nr_redist_regions; |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 50 | unsigned int irq_nr; |
| 51 | }; |
| 52 | |
| 53 | static struct gic_chip_data gic_data __read_mostly; |
Marc Zyngier | 0b6a3da | 2015-08-26 17:00:42 +0100 | [diff] [blame] | 54 | static struct static_key supports_deactivate = STATIC_KEY_INIT_TRUE; |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 55 | |
Marc Zyngier | f5c1434 | 2014-11-24 14:35:10 +0000 | [diff] [blame] | 56 | #define gic_data_rdist() (this_cpu_ptr(gic_data.rdists.rdist)) |
| 57 | #define gic_data_rdist_rd_base() (gic_data_rdist()->rd_base) |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 58 | #define gic_data_rdist_sgi_base() (gic_data_rdist_rd_base() + SZ_64K) |
| 59 | |
| 60 | /* Our default, arbitrary priority value. Linux only uses one anyway. */ |
| 61 | #define DEFAULT_PMR_VALUE 0xf0 |
| 62 | |
| 63 | static inline unsigned int gic_irq(struct irq_data *d) |
| 64 | { |
| 65 | return d->hwirq; |
| 66 | } |
| 67 | |
| 68 | static inline int gic_irq_in_rdist(struct irq_data *d) |
| 69 | { |
| 70 | return gic_irq(d) < 32; |
| 71 | } |
| 72 | |
| 73 | static inline void __iomem *gic_dist_base(struct irq_data *d) |
| 74 | { |
| 75 | if (gic_irq_in_rdist(d)) /* SGI+PPI -> SGI_base for this CPU */ |
| 76 | return gic_data_rdist_sgi_base(); |
| 77 | |
| 78 | if (d->hwirq <= 1023) /* SPI -> dist_base */ |
| 79 | return gic_data.dist_base; |
| 80 | |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 81 | return NULL; |
| 82 | } |
| 83 | |
| 84 | static void gic_do_wait_for_rwp(void __iomem *base) |
| 85 | { |
| 86 | u32 count = 1000000; /* 1s! */ |
| 87 | |
| 88 | while (readl_relaxed(base + GICD_CTLR) & GICD_CTLR_RWP) { |
| 89 | count--; |
| 90 | if (!count) { |
| 91 | pr_err_ratelimited("RWP timeout, gone fishing\n"); |
| 92 | return; |
| 93 | } |
| 94 | cpu_relax(); |
| 95 | udelay(1); |
| 96 | }; |
| 97 | } |
| 98 | |
| 99 | /* Wait for completion of a distributor change */ |
| 100 | static void gic_dist_wait_for_rwp(void) |
| 101 | { |
| 102 | gic_do_wait_for_rwp(gic_data.dist_base); |
| 103 | } |
| 104 | |
| 105 | /* Wait for completion of a redistributor change */ |
| 106 | static void gic_redist_wait_for_rwp(void) |
| 107 | { |
| 108 | gic_do_wait_for_rwp(gic_data_rdist_rd_base()); |
| 109 | } |
| 110 | |
| 111 | /* Low level accessors */ |
Robert Richter | 6d4e11c | 2015-09-21 22:58:35 +0200 | [diff] [blame] | 112 | static u64 gic_read_iar_common(void) |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 113 | { |
| 114 | u64 irqstat; |
| 115 | |
Catalin Marinas | 72c5839 | 2014-07-24 14:14:42 +0100 | [diff] [blame] | 116 | asm volatile("mrs_s %0, " __stringify(ICC_IAR1_EL1) : "=r" (irqstat)); |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 117 | return irqstat; |
| 118 | } |
| 119 | |
Robert Richter | 6d4e11c | 2015-09-21 22:58:35 +0200 | [diff] [blame] | 120 | /* |
| 121 | * Cavium ThunderX erratum 23154 |
| 122 | * |
| 123 | * The gicv3 of ThunderX requires a modified version for reading the |
| 124 | * IAR status to ensure data synchronization (access to icc_iar1_el1 |
| 125 | * is not sync'ed before and after). |
| 126 | */ |
| 127 | static u64 gic_read_iar_cavium_thunderx(void) |
| 128 | { |
| 129 | u64 irqstat; |
| 130 | |
| 131 | asm volatile( |
| 132 | "nop;nop;nop;nop\n\t" |
| 133 | "nop;nop;nop;nop\n\t" |
| 134 | "mrs_s %0, " __stringify(ICC_IAR1_EL1) "\n\t" |
| 135 | "nop;nop;nop;nop" |
| 136 | : "=r" (irqstat)); |
| 137 | mb(); |
| 138 | |
| 139 | return irqstat; |
| 140 | } |
| 141 | |
Robert Richter | 8ac2a17 | 2015-09-21 22:58:39 +0200 | [diff] [blame] | 142 | static DEFINE_STATIC_KEY_FALSE(is_cavium_thunderx); |
Robert Richter | 6d4e11c | 2015-09-21 22:58:35 +0200 | [diff] [blame] | 143 | |
| 144 | static u64 __maybe_unused gic_read_iar(void) |
| 145 | { |
Robert Richter | 8ac2a17 | 2015-09-21 22:58:39 +0200 | [diff] [blame] | 146 | if (static_branch_unlikely(&is_cavium_thunderx)) |
Robert Richter | 6d4e11c | 2015-09-21 22:58:35 +0200 | [diff] [blame] | 147 | return gic_read_iar_cavium_thunderx(); |
| 148 | else |
| 149 | return gic_read_iar_common(); |
| 150 | } |
| 151 | |
Mark Brown | c44e9d7 | 2014-07-30 20:23:14 +0100 | [diff] [blame] | 152 | static void __maybe_unused gic_write_pmr(u64 val) |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 153 | { |
Catalin Marinas | 72c5839 | 2014-07-24 14:14:42 +0100 | [diff] [blame] | 154 | asm volatile("msr_s " __stringify(ICC_PMR_EL1) ", %0" : : "r" (val)); |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 155 | } |
| 156 | |
Mark Brown | c44e9d7 | 2014-07-30 20:23:14 +0100 | [diff] [blame] | 157 | static void __maybe_unused gic_write_ctlr(u64 val) |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 158 | { |
Catalin Marinas | 72c5839 | 2014-07-24 14:14:42 +0100 | [diff] [blame] | 159 | asm volatile("msr_s " __stringify(ICC_CTLR_EL1) ", %0" : : "r" (val)); |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 160 | isb(); |
| 161 | } |
| 162 | |
Mark Brown | c44e9d7 | 2014-07-30 20:23:14 +0100 | [diff] [blame] | 163 | static void __maybe_unused gic_write_grpen1(u64 val) |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 164 | { |
Catalin Marinas | 72c5839 | 2014-07-24 14:14:42 +0100 | [diff] [blame] | 165 | asm volatile("msr_s " __stringify(ICC_GRPEN1_EL1) ", %0" : : "r" (val)); |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 166 | isb(); |
| 167 | } |
| 168 | |
Mark Brown | c44e9d7 | 2014-07-30 20:23:14 +0100 | [diff] [blame] | 169 | static void __maybe_unused gic_write_sgi1r(u64 val) |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 170 | { |
Catalin Marinas | 72c5839 | 2014-07-24 14:14:42 +0100 | [diff] [blame] | 171 | asm volatile("msr_s " __stringify(ICC_SGI1R_EL1) ", %0" : : "r" (val)); |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 172 | } |
| 173 | |
Sudeep Holla | a2c2251 | 2014-08-26 16:03:34 +0100 | [diff] [blame] | 174 | static void gic_enable_redist(bool enable) |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 175 | { |
| 176 | void __iomem *rbase; |
| 177 | u32 count = 1000000; /* 1s! */ |
| 178 | u32 val; |
| 179 | |
| 180 | rbase = gic_data_rdist_rd_base(); |
| 181 | |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 182 | val = readl_relaxed(rbase + GICR_WAKER); |
Sudeep Holla | a2c2251 | 2014-08-26 16:03:34 +0100 | [diff] [blame] | 183 | if (enable) |
| 184 | /* Wake up this CPU redistributor */ |
| 185 | val &= ~GICR_WAKER_ProcessorSleep; |
| 186 | else |
| 187 | val |= GICR_WAKER_ProcessorSleep; |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 188 | writel_relaxed(val, rbase + GICR_WAKER); |
| 189 | |
Sudeep Holla | a2c2251 | 2014-08-26 16:03:34 +0100 | [diff] [blame] | 190 | if (!enable) { /* Check that GICR_WAKER is writeable */ |
| 191 | val = readl_relaxed(rbase + GICR_WAKER); |
| 192 | if (!(val & GICR_WAKER_ProcessorSleep)) |
| 193 | return; /* No PM support in this redistributor */ |
| 194 | } |
| 195 | |
| 196 | while (count--) { |
| 197 | val = readl_relaxed(rbase + GICR_WAKER); |
| 198 | if (enable ^ (val & GICR_WAKER_ChildrenAsleep)) |
| 199 | break; |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 200 | cpu_relax(); |
| 201 | udelay(1); |
| 202 | }; |
Sudeep Holla | a2c2251 | 2014-08-26 16:03:34 +0100 | [diff] [blame] | 203 | if (!count) |
| 204 | pr_err_ratelimited("redistributor failed to %s...\n", |
| 205 | enable ? "wakeup" : "sleep"); |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 206 | } |
| 207 | |
| 208 | /* |
| 209 | * Routines to disable, enable, EOI and route interrupts |
| 210 | */ |
Marc Zyngier | b594c6e | 2015-03-18 11:01:24 +0000 | [diff] [blame] | 211 | static int gic_peek_irq(struct irq_data *d, u32 offset) |
| 212 | { |
| 213 | u32 mask = 1 << (gic_irq(d) % 32); |
| 214 | void __iomem *base; |
| 215 | |
| 216 | if (gic_irq_in_rdist(d)) |
| 217 | base = gic_data_rdist_sgi_base(); |
| 218 | else |
| 219 | base = gic_data.dist_base; |
| 220 | |
| 221 | return !!(readl_relaxed(base + offset + (gic_irq(d) / 32) * 4) & mask); |
| 222 | } |
| 223 | |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 224 | static void gic_poke_irq(struct irq_data *d, u32 offset) |
| 225 | { |
| 226 | u32 mask = 1 << (gic_irq(d) % 32); |
| 227 | void (*rwp_wait)(void); |
| 228 | void __iomem *base; |
| 229 | |
| 230 | if (gic_irq_in_rdist(d)) { |
| 231 | base = gic_data_rdist_sgi_base(); |
| 232 | rwp_wait = gic_redist_wait_for_rwp; |
| 233 | } else { |
| 234 | base = gic_data.dist_base; |
| 235 | rwp_wait = gic_dist_wait_for_rwp; |
| 236 | } |
| 237 | |
| 238 | writel_relaxed(mask, base + offset + (gic_irq(d) / 32) * 4); |
| 239 | rwp_wait(); |
| 240 | } |
| 241 | |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 242 | static void gic_mask_irq(struct irq_data *d) |
| 243 | { |
| 244 | gic_poke_irq(d, GICD_ICENABLER); |
| 245 | } |
| 246 | |
Marc Zyngier | 0b6a3da | 2015-08-26 17:00:42 +0100 | [diff] [blame] | 247 | static void gic_eoimode1_mask_irq(struct irq_data *d) |
| 248 | { |
| 249 | gic_mask_irq(d); |
Marc Zyngier | 530bf35 | 2015-08-26 17:00:43 +0100 | [diff] [blame] | 250 | /* |
| 251 | * When masking a forwarded interrupt, make sure it is |
| 252 | * deactivated as well. |
| 253 | * |
| 254 | * This ensures that an interrupt that is getting |
| 255 | * disabled/masked will not get "stuck", because there is |
| 256 | * noone to deactivate it (guest is being terminated). |
| 257 | */ |
Thomas Gleixner | 4df7f54 | 2015-09-15 13:19:16 +0200 | [diff] [blame] | 258 | if (irqd_is_forwarded_to_vcpu(d)) |
Marc Zyngier | 530bf35 | 2015-08-26 17:00:43 +0100 | [diff] [blame] | 259 | gic_poke_irq(d, GICD_ICACTIVER); |
Marc Zyngier | 0b6a3da | 2015-08-26 17:00:42 +0100 | [diff] [blame] | 260 | } |
| 261 | |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 262 | static void gic_unmask_irq(struct irq_data *d) |
| 263 | { |
| 264 | gic_poke_irq(d, GICD_ISENABLER); |
| 265 | } |
| 266 | |
Marc Zyngier | b594c6e | 2015-03-18 11:01:24 +0000 | [diff] [blame] | 267 | static int gic_irq_set_irqchip_state(struct irq_data *d, |
| 268 | enum irqchip_irq_state which, bool val) |
| 269 | { |
| 270 | u32 reg; |
| 271 | |
| 272 | if (d->hwirq >= gic_data.irq_nr) /* PPI/SPI only */ |
| 273 | return -EINVAL; |
| 274 | |
| 275 | switch (which) { |
| 276 | case IRQCHIP_STATE_PENDING: |
| 277 | reg = val ? GICD_ISPENDR : GICD_ICPENDR; |
| 278 | break; |
| 279 | |
| 280 | case IRQCHIP_STATE_ACTIVE: |
| 281 | reg = val ? GICD_ISACTIVER : GICD_ICACTIVER; |
| 282 | break; |
| 283 | |
| 284 | case IRQCHIP_STATE_MASKED: |
| 285 | reg = val ? GICD_ICENABLER : GICD_ISENABLER; |
| 286 | break; |
| 287 | |
| 288 | default: |
| 289 | return -EINVAL; |
| 290 | } |
| 291 | |
| 292 | gic_poke_irq(d, reg); |
| 293 | return 0; |
| 294 | } |
| 295 | |
| 296 | static int gic_irq_get_irqchip_state(struct irq_data *d, |
| 297 | enum irqchip_irq_state which, bool *val) |
| 298 | { |
| 299 | if (d->hwirq >= gic_data.irq_nr) /* PPI/SPI only */ |
| 300 | return -EINVAL; |
| 301 | |
| 302 | switch (which) { |
| 303 | case IRQCHIP_STATE_PENDING: |
| 304 | *val = gic_peek_irq(d, GICD_ISPENDR); |
| 305 | break; |
| 306 | |
| 307 | case IRQCHIP_STATE_ACTIVE: |
| 308 | *val = gic_peek_irq(d, GICD_ISACTIVER); |
| 309 | break; |
| 310 | |
| 311 | case IRQCHIP_STATE_MASKED: |
| 312 | *val = !gic_peek_irq(d, GICD_ISENABLER); |
| 313 | break; |
| 314 | |
| 315 | default: |
| 316 | return -EINVAL; |
| 317 | } |
| 318 | |
| 319 | return 0; |
| 320 | } |
| 321 | |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 322 | static void gic_eoi_irq(struct irq_data *d) |
| 323 | { |
| 324 | gic_write_eoir(gic_irq(d)); |
| 325 | } |
| 326 | |
Marc Zyngier | 0b6a3da | 2015-08-26 17:00:42 +0100 | [diff] [blame] | 327 | static void gic_eoimode1_eoi_irq(struct irq_data *d) |
| 328 | { |
| 329 | /* |
Marc Zyngier | 530bf35 | 2015-08-26 17:00:43 +0100 | [diff] [blame] | 330 | * No need to deactivate an LPI, or an interrupt that |
| 331 | * is is getting forwarded to a vcpu. |
Marc Zyngier | 0b6a3da | 2015-08-26 17:00:42 +0100 | [diff] [blame] | 332 | */ |
Thomas Gleixner | 4df7f54 | 2015-09-15 13:19:16 +0200 | [diff] [blame] | 333 | if (gic_irq(d) >= 8192 || irqd_is_forwarded_to_vcpu(d)) |
Marc Zyngier | 0b6a3da | 2015-08-26 17:00:42 +0100 | [diff] [blame] | 334 | return; |
| 335 | gic_write_dir(gic_irq(d)); |
| 336 | } |
| 337 | |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 338 | static int gic_set_type(struct irq_data *d, unsigned int type) |
| 339 | { |
| 340 | unsigned int irq = gic_irq(d); |
| 341 | void (*rwp_wait)(void); |
| 342 | void __iomem *base; |
| 343 | |
| 344 | /* Interrupt configuration for SGIs can't be changed */ |
| 345 | if (irq < 16) |
| 346 | return -EINVAL; |
| 347 | |
Liviu Dudau | fb7e7de | 2015-01-20 16:52:59 +0000 | [diff] [blame] | 348 | /* SPIs have restrictions on the supported types */ |
| 349 | if (irq >= 32 && type != IRQ_TYPE_LEVEL_HIGH && |
| 350 | type != IRQ_TYPE_EDGE_RISING) |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 351 | return -EINVAL; |
| 352 | |
| 353 | if (gic_irq_in_rdist(d)) { |
| 354 | base = gic_data_rdist_sgi_base(); |
| 355 | rwp_wait = gic_redist_wait_for_rwp; |
| 356 | } else { |
| 357 | base = gic_data.dist_base; |
| 358 | rwp_wait = gic_dist_wait_for_rwp; |
| 359 | } |
| 360 | |
Liviu Dudau | fb7e7de | 2015-01-20 16:52:59 +0000 | [diff] [blame] | 361 | return gic_configure_irq(irq, type, base, rwp_wait); |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 362 | } |
| 363 | |
Marc Zyngier | 530bf35 | 2015-08-26 17:00:43 +0100 | [diff] [blame] | 364 | static int gic_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu) |
| 365 | { |
Thomas Gleixner | 4df7f54 | 2015-09-15 13:19:16 +0200 | [diff] [blame] | 366 | if (vcpu) |
| 367 | irqd_set_forwarded_to_vcpu(d); |
| 368 | else |
| 369 | irqd_clr_forwarded_to_vcpu(d); |
Marc Zyngier | 530bf35 | 2015-08-26 17:00:43 +0100 | [diff] [blame] | 370 | return 0; |
| 371 | } |
| 372 | |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 373 | static u64 gic_mpidr_to_affinity(u64 mpidr) |
| 374 | { |
| 375 | u64 aff; |
| 376 | |
| 377 | aff = (MPIDR_AFFINITY_LEVEL(mpidr, 3) << 32 | |
| 378 | MPIDR_AFFINITY_LEVEL(mpidr, 2) << 16 | |
| 379 | MPIDR_AFFINITY_LEVEL(mpidr, 1) << 8 | |
| 380 | MPIDR_AFFINITY_LEVEL(mpidr, 0)); |
| 381 | |
| 382 | return aff; |
| 383 | } |
| 384 | |
| 385 | static asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs) |
| 386 | { |
| 387 | u64 irqnr; |
| 388 | |
| 389 | do { |
| 390 | irqnr = gic_read_iar(); |
| 391 | |
Marc Zyngier | da33f31 | 2014-11-24 14:35:18 +0000 | [diff] [blame] | 392 | if (likely(irqnr > 15 && irqnr < 1020) || irqnr >= 8192) { |
Marc Zyngier | ebc6de0 | 2014-08-26 11:03:33 +0100 | [diff] [blame] | 393 | int err; |
Marc Zyngier | 0b6a3da | 2015-08-26 17:00:42 +0100 | [diff] [blame] | 394 | |
| 395 | if (static_key_true(&supports_deactivate)) |
| 396 | gic_write_eoir(irqnr); |
| 397 | |
Marc Zyngier | ebc6de0 | 2014-08-26 11:03:33 +0100 | [diff] [blame] | 398 | err = handle_domain_irq(gic_data.domain, irqnr, regs); |
| 399 | if (err) { |
Marc Zyngier | da33f31 | 2014-11-24 14:35:18 +0000 | [diff] [blame] | 400 | WARN_ONCE(true, "Unexpected interrupt received!\n"); |
Marc Zyngier | 0b6a3da | 2015-08-26 17:00:42 +0100 | [diff] [blame] | 401 | if (static_key_true(&supports_deactivate)) { |
| 402 | if (irqnr < 8192) |
| 403 | gic_write_dir(irqnr); |
| 404 | } else { |
| 405 | gic_write_eoir(irqnr); |
| 406 | } |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 407 | } |
Marc Zyngier | ebc6de0 | 2014-08-26 11:03:33 +0100 | [diff] [blame] | 408 | continue; |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 409 | } |
| 410 | if (irqnr < 16) { |
| 411 | gic_write_eoir(irqnr); |
Marc Zyngier | 0b6a3da | 2015-08-26 17:00:42 +0100 | [diff] [blame] | 412 | if (static_key_true(&supports_deactivate)) |
| 413 | gic_write_dir(irqnr); |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 414 | #ifdef CONFIG_SMP |
| 415 | handle_IPI(irqnr, regs); |
| 416 | #else |
| 417 | WARN_ONCE(true, "Unexpected SGI received!\n"); |
| 418 | #endif |
| 419 | continue; |
| 420 | } |
| 421 | } while (irqnr != ICC_IAR1_EL1_SPURIOUS); |
| 422 | } |
| 423 | |
| 424 | static void __init gic_dist_init(void) |
| 425 | { |
| 426 | unsigned int i; |
| 427 | u64 affinity; |
| 428 | void __iomem *base = gic_data.dist_base; |
| 429 | |
| 430 | /* Disable the distributor */ |
| 431 | writel_relaxed(0, base + GICD_CTLR); |
| 432 | gic_dist_wait_for_rwp(); |
| 433 | |
| 434 | gic_dist_config(base, gic_data.irq_nr, gic_dist_wait_for_rwp); |
| 435 | |
| 436 | /* Enable distributor with ARE, Group1 */ |
| 437 | writel_relaxed(GICD_CTLR_ARE_NS | GICD_CTLR_ENABLE_G1A | GICD_CTLR_ENABLE_G1, |
| 438 | base + GICD_CTLR); |
| 439 | |
| 440 | /* |
| 441 | * Set all global interrupts to the boot CPU only. ARE must be |
| 442 | * enabled. |
| 443 | */ |
| 444 | affinity = gic_mpidr_to_affinity(cpu_logical_map(smp_processor_id())); |
| 445 | for (i = 32; i < gic_data.irq_nr; i++) |
| 446 | writeq_relaxed(affinity, base + GICD_IROUTER + i * 8); |
| 447 | } |
| 448 | |
| 449 | static int gic_populate_rdist(void) |
| 450 | { |
| 451 | u64 mpidr = cpu_logical_map(smp_processor_id()); |
| 452 | u64 typer; |
| 453 | u32 aff; |
| 454 | int i; |
| 455 | |
| 456 | /* |
| 457 | * Convert affinity to a 32bit value that can be matched to |
| 458 | * GICR_TYPER bits [63:32]. |
| 459 | */ |
| 460 | aff = (MPIDR_AFFINITY_LEVEL(mpidr, 3) << 24 | |
| 461 | MPIDR_AFFINITY_LEVEL(mpidr, 2) << 16 | |
| 462 | MPIDR_AFFINITY_LEVEL(mpidr, 1) << 8 | |
| 463 | MPIDR_AFFINITY_LEVEL(mpidr, 0)); |
| 464 | |
Marc Zyngier | f5c1434 | 2014-11-24 14:35:10 +0000 | [diff] [blame] | 465 | for (i = 0; i < gic_data.nr_redist_regions; i++) { |
| 466 | void __iomem *ptr = gic_data.redist_regions[i].redist_base; |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 467 | u32 reg; |
| 468 | |
| 469 | reg = readl_relaxed(ptr + GICR_PIDR2) & GIC_PIDR2_ARCH_MASK; |
| 470 | if (reg != GIC_PIDR2_ARCH_GICv3 && |
| 471 | reg != GIC_PIDR2_ARCH_GICv4) { /* We're in trouble... */ |
| 472 | pr_warn("No redistributor present @%p\n", ptr); |
| 473 | break; |
| 474 | } |
| 475 | |
| 476 | do { |
| 477 | typer = readq_relaxed(ptr + GICR_TYPER); |
| 478 | if ((typer >> 32) == aff) { |
Marc Zyngier | f5c1434 | 2014-11-24 14:35:10 +0000 | [diff] [blame] | 479 | u64 offset = ptr - gic_data.redist_regions[i].redist_base; |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 480 | gic_data_rdist_rd_base() = ptr; |
Marc Zyngier | f5c1434 | 2014-11-24 14:35:10 +0000 | [diff] [blame] | 481 | gic_data_rdist()->phys_base = gic_data.redist_regions[i].phys_base + offset; |
| 482 | pr_info("CPU%d: found redistributor %llx region %d:%pa\n", |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 483 | smp_processor_id(), |
Marc Zyngier | f5c1434 | 2014-11-24 14:35:10 +0000 | [diff] [blame] | 484 | (unsigned long long)mpidr, |
| 485 | i, &gic_data_rdist()->phys_base); |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 486 | return 0; |
| 487 | } |
| 488 | |
| 489 | if (gic_data.redist_stride) { |
| 490 | ptr += gic_data.redist_stride; |
| 491 | } else { |
| 492 | ptr += SZ_64K * 2; /* Skip RD_base + SGI_base */ |
| 493 | if (typer & GICR_TYPER_VLPIS) |
| 494 | ptr += SZ_64K * 2; /* Skip VLPI_base + reserved page */ |
| 495 | } |
| 496 | } while (!(typer & GICR_TYPER_LAST)); |
| 497 | } |
| 498 | |
| 499 | /* We couldn't even deal with ourselves... */ |
| 500 | WARN(true, "CPU%d: mpidr %llx has no re-distributor!\n", |
| 501 | smp_processor_id(), (unsigned long long)mpidr); |
| 502 | return -ENODEV; |
| 503 | } |
| 504 | |
Sudeep Holla | 3708d52 | 2014-08-26 16:03:35 +0100 | [diff] [blame] | 505 | static void gic_cpu_sys_reg_init(void) |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 506 | { |
Marc Zyngier | 7cabd00 | 2015-09-30 11:48:01 +0100 | [diff] [blame^] | 507 | /* |
| 508 | * Need to check that the SRE bit has actually been set. If |
| 509 | * not, it means that SRE is disabled at EL2. We're going to |
| 510 | * die painfully, and there is nothing we can do about it. |
| 511 | * |
| 512 | * Kindly inform the luser. |
| 513 | */ |
| 514 | if (!gic_enable_sre()) |
| 515 | pr_err("GIC: unable to set SRE (disabled at EL2), panic ahead\n"); |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 516 | |
| 517 | /* Set priority mask register */ |
| 518 | gic_write_pmr(DEFAULT_PMR_VALUE); |
| 519 | |
Marc Zyngier | 0b6a3da | 2015-08-26 17:00:42 +0100 | [diff] [blame] | 520 | if (static_key_true(&supports_deactivate)) { |
| 521 | /* EOI drops priority only (mode 1) */ |
| 522 | gic_write_ctlr(ICC_CTLR_EL1_EOImode_drop); |
| 523 | } else { |
| 524 | /* EOI deactivates interrupt too (mode 0) */ |
| 525 | gic_write_ctlr(ICC_CTLR_EL1_EOImode_drop_dir); |
| 526 | } |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 527 | |
| 528 | /* ... and let's hit the road... */ |
| 529 | gic_write_grpen1(1); |
| 530 | } |
| 531 | |
Marc Zyngier | da33f31 | 2014-11-24 14:35:18 +0000 | [diff] [blame] | 532 | static int gic_dist_supports_lpis(void) |
| 533 | { |
| 534 | return !!(readl_relaxed(gic_data.dist_base + GICD_TYPER) & GICD_TYPER_LPIS); |
| 535 | } |
| 536 | |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 537 | static void gic_cpu_init(void) |
| 538 | { |
| 539 | void __iomem *rbase; |
| 540 | |
| 541 | /* Register ourselves with the rest of the world */ |
| 542 | if (gic_populate_rdist()) |
| 543 | return; |
| 544 | |
Sudeep Holla | a2c2251 | 2014-08-26 16:03:34 +0100 | [diff] [blame] | 545 | gic_enable_redist(true); |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 546 | |
| 547 | rbase = gic_data_rdist_sgi_base(); |
| 548 | |
| 549 | gic_cpu_config(rbase, gic_redist_wait_for_rwp); |
| 550 | |
Marc Zyngier | da33f31 | 2014-11-24 14:35:18 +0000 | [diff] [blame] | 551 | /* Give LPIs a spin */ |
| 552 | if (IS_ENABLED(CONFIG_ARM_GIC_V3_ITS) && gic_dist_supports_lpis()) |
| 553 | its_cpu_init(); |
| 554 | |
Sudeep Holla | 3708d52 | 2014-08-26 16:03:35 +0100 | [diff] [blame] | 555 | /* initialise system registers */ |
| 556 | gic_cpu_sys_reg_init(); |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 557 | } |
| 558 | |
| 559 | #ifdef CONFIG_SMP |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 560 | static int gic_secondary_init(struct notifier_block *nfb, |
| 561 | unsigned long action, void *hcpu) |
| 562 | { |
| 563 | if (action == CPU_STARTING || action == CPU_STARTING_FROZEN) |
| 564 | gic_cpu_init(); |
| 565 | return NOTIFY_OK; |
| 566 | } |
| 567 | |
| 568 | /* |
| 569 | * Notifier for enabling the GIC CPU interface. Set an arbitrarily high |
| 570 | * priority because the GIC needs to be up before the ARM generic timers. |
| 571 | */ |
| 572 | static struct notifier_block gic_cpu_notifier = { |
| 573 | .notifier_call = gic_secondary_init, |
| 574 | .priority = 100, |
| 575 | }; |
| 576 | |
| 577 | static u16 gic_compute_target_list(int *base_cpu, const struct cpumask *mask, |
| 578 | u64 cluster_id) |
| 579 | { |
| 580 | int cpu = *base_cpu; |
| 581 | u64 mpidr = cpu_logical_map(cpu); |
| 582 | u16 tlist = 0; |
| 583 | |
| 584 | while (cpu < nr_cpu_ids) { |
| 585 | /* |
| 586 | * If we ever get a cluster of more than 16 CPUs, just |
| 587 | * scream and skip that CPU. |
| 588 | */ |
| 589 | if (WARN_ON((mpidr & 0xff) >= 16)) |
| 590 | goto out; |
| 591 | |
| 592 | tlist |= 1 << (mpidr & 0xf); |
| 593 | |
| 594 | cpu = cpumask_next(cpu, mask); |
Vladimir Murzin | 614be38 | 2015-03-06 16:37:45 +0000 | [diff] [blame] | 595 | if (cpu >= nr_cpu_ids) |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 596 | goto out; |
| 597 | |
| 598 | mpidr = cpu_logical_map(cpu); |
| 599 | |
| 600 | if (cluster_id != (mpidr & ~0xffUL)) { |
| 601 | cpu--; |
| 602 | goto out; |
| 603 | } |
| 604 | } |
| 605 | out: |
| 606 | *base_cpu = cpu; |
| 607 | return tlist; |
| 608 | } |
| 609 | |
Andre Przywara | 7e58027 | 2014-11-12 13:46:06 +0000 | [diff] [blame] | 610 | #define MPIDR_TO_SGI_AFFINITY(cluster_id, level) \ |
| 611 | (MPIDR_AFFINITY_LEVEL(cluster_id, level) \ |
| 612 | << ICC_SGI1R_AFFINITY_## level ##_SHIFT) |
| 613 | |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 614 | static void gic_send_sgi(u64 cluster_id, u16 tlist, unsigned int irq) |
| 615 | { |
| 616 | u64 val; |
| 617 | |
Andre Przywara | 7e58027 | 2014-11-12 13:46:06 +0000 | [diff] [blame] | 618 | val = (MPIDR_TO_SGI_AFFINITY(cluster_id, 3) | |
| 619 | MPIDR_TO_SGI_AFFINITY(cluster_id, 2) | |
| 620 | irq << ICC_SGI1R_SGI_ID_SHIFT | |
| 621 | MPIDR_TO_SGI_AFFINITY(cluster_id, 1) | |
| 622 | tlist << ICC_SGI1R_TARGET_LIST_SHIFT); |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 623 | |
| 624 | pr_debug("CPU%d: ICC_SGI1R_EL1 %llx\n", smp_processor_id(), val); |
| 625 | gic_write_sgi1r(val); |
| 626 | } |
| 627 | |
| 628 | static void gic_raise_softirq(const struct cpumask *mask, unsigned int irq) |
| 629 | { |
| 630 | int cpu; |
| 631 | |
| 632 | if (WARN_ON(irq >= 16)) |
| 633 | return; |
| 634 | |
| 635 | /* |
| 636 | * Ensure that stores to Normal memory are visible to the |
| 637 | * other CPUs before issuing the IPI. |
| 638 | */ |
| 639 | smp_wmb(); |
| 640 | |
Rusty Russell | f9b531f | 2015-03-05 10:49:16 +1030 | [diff] [blame] | 641 | for_each_cpu(cpu, mask) { |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 642 | u64 cluster_id = cpu_logical_map(cpu) & ~0xffUL; |
| 643 | u16 tlist; |
| 644 | |
| 645 | tlist = gic_compute_target_list(&cpu, mask, cluster_id); |
| 646 | gic_send_sgi(cluster_id, tlist, irq); |
| 647 | } |
| 648 | |
| 649 | /* Force the above writes to ICC_SGI1R_EL1 to be executed */ |
| 650 | isb(); |
| 651 | } |
| 652 | |
| 653 | static void gic_smp_init(void) |
| 654 | { |
| 655 | set_smp_cross_call(gic_raise_softirq); |
| 656 | register_cpu_notifier(&gic_cpu_notifier); |
| 657 | } |
| 658 | |
| 659 | static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val, |
| 660 | bool force) |
| 661 | { |
| 662 | unsigned int cpu = cpumask_any_and(mask_val, cpu_online_mask); |
| 663 | void __iomem *reg; |
| 664 | int enabled; |
| 665 | u64 val; |
| 666 | |
| 667 | if (gic_irq_in_rdist(d)) |
| 668 | return -EINVAL; |
| 669 | |
| 670 | /* If interrupt was enabled, disable it first */ |
| 671 | enabled = gic_peek_irq(d, GICD_ISENABLER); |
| 672 | if (enabled) |
| 673 | gic_mask_irq(d); |
| 674 | |
| 675 | reg = gic_dist_base(d) + GICD_IROUTER + (gic_irq(d) * 8); |
| 676 | val = gic_mpidr_to_affinity(cpu_logical_map(cpu)); |
| 677 | |
| 678 | writeq_relaxed(val, reg); |
| 679 | |
| 680 | /* |
| 681 | * If the interrupt was enabled, enabled it again. Otherwise, |
| 682 | * just wait for the distributor to have digested our changes. |
| 683 | */ |
| 684 | if (enabled) |
| 685 | gic_unmask_irq(d); |
| 686 | else |
| 687 | gic_dist_wait_for_rwp(); |
| 688 | |
| 689 | return IRQ_SET_MASK_OK; |
| 690 | } |
| 691 | #else |
| 692 | #define gic_set_affinity NULL |
| 693 | #define gic_smp_init() do { } while(0) |
| 694 | #endif |
| 695 | |
Sudeep Holla | 3708d52 | 2014-08-26 16:03:35 +0100 | [diff] [blame] | 696 | #ifdef CONFIG_CPU_PM |
| 697 | static int gic_cpu_pm_notifier(struct notifier_block *self, |
| 698 | unsigned long cmd, void *v) |
| 699 | { |
| 700 | if (cmd == CPU_PM_EXIT) { |
| 701 | gic_enable_redist(true); |
| 702 | gic_cpu_sys_reg_init(); |
| 703 | } else if (cmd == CPU_PM_ENTER) { |
| 704 | gic_write_grpen1(0); |
| 705 | gic_enable_redist(false); |
| 706 | } |
| 707 | return NOTIFY_OK; |
| 708 | } |
| 709 | |
| 710 | static struct notifier_block gic_cpu_pm_notifier_block = { |
| 711 | .notifier_call = gic_cpu_pm_notifier, |
| 712 | }; |
| 713 | |
| 714 | static void gic_cpu_pm_init(void) |
| 715 | { |
| 716 | cpu_pm_register_notifier(&gic_cpu_pm_notifier_block); |
| 717 | } |
| 718 | |
| 719 | #else |
| 720 | static inline void gic_cpu_pm_init(void) { } |
| 721 | #endif /* CONFIG_CPU_PM */ |
| 722 | |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 723 | static struct irq_chip gic_chip = { |
| 724 | .name = "GICv3", |
| 725 | .irq_mask = gic_mask_irq, |
| 726 | .irq_unmask = gic_unmask_irq, |
| 727 | .irq_eoi = gic_eoi_irq, |
| 728 | .irq_set_type = gic_set_type, |
| 729 | .irq_set_affinity = gic_set_affinity, |
Marc Zyngier | b594c6e | 2015-03-18 11:01:24 +0000 | [diff] [blame] | 730 | .irq_get_irqchip_state = gic_irq_get_irqchip_state, |
| 731 | .irq_set_irqchip_state = gic_irq_set_irqchip_state, |
Sudeep Holla | 55963c9 | 2015-06-05 11:59:57 +0100 | [diff] [blame] | 732 | .flags = IRQCHIP_SET_TYPE_MASKED, |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 733 | }; |
| 734 | |
Marc Zyngier | 0b6a3da | 2015-08-26 17:00:42 +0100 | [diff] [blame] | 735 | static struct irq_chip gic_eoimode1_chip = { |
| 736 | .name = "GICv3", |
| 737 | .irq_mask = gic_eoimode1_mask_irq, |
| 738 | .irq_unmask = gic_unmask_irq, |
| 739 | .irq_eoi = gic_eoimode1_eoi_irq, |
| 740 | .irq_set_type = gic_set_type, |
| 741 | .irq_set_affinity = gic_set_affinity, |
| 742 | .irq_get_irqchip_state = gic_irq_get_irqchip_state, |
| 743 | .irq_set_irqchip_state = gic_irq_set_irqchip_state, |
Marc Zyngier | 530bf35 | 2015-08-26 17:00:43 +0100 | [diff] [blame] | 744 | .irq_set_vcpu_affinity = gic_irq_set_vcpu_affinity, |
Marc Zyngier | 0b6a3da | 2015-08-26 17:00:42 +0100 | [diff] [blame] | 745 | .flags = IRQCHIP_SET_TYPE_MASKED, |
| 746 | }; |
| 747 | |
Marc Zyngier | da33f31 | 2014-11-24 14:35:18 +0000 | [diff] [blame] | 748 | #define GIC_ID_NR (1U << gic_data.rdists.id_bits) |
| 749 | |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 750 | static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq, |
| 751 | irq_hw_number_t hw) |
| 752 | { |
Marc Zyngier | 0b6a3da | 2015-08-26 17:00:42 +0100 | [diff] [blame] | 753 | struct irq_chip *chip = &gic_chip; |
| 754 | |
| 755 | if (static_key_true(&supports_deactivate)) |
| 756 | chip = &gic_eoimode1_chip; |
| 757 | |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 758 | /* SGIs are private to the core kernel */ |
| 759 | if (hw < 16) |
| 760 | return -EPERM; |
Marc Zyngier | da33f31 | 2014-11-24 14:35:18 +0000 | [diff] [blame] | 761 | /* Nothing here */ |
| 762 | if (hw >= gic_data.irq_nr && hw < 8192) |
| 763 | return -EPERM; |
| 764 | /* Off limits */ |
| 765 | if (hw >= GIC_ID_NR) |
| 766 | return -EPERM; |
| 767 | |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 768 | /* PPIs */ |
| 769 | if (hw < 32) { |
| 770 | irq_set_percpu_devid(irq); |
Marc Zyngier | 0b6a3da | 2015-08-26 17:00:42 +0100 | [diff] [blame] | 771 | irq_domain_set_info(d, irq, hw, chip, d->host_data, |
Marc Zyngier | 443acc4 | 2014-11-24 14:35:09 +0000 | [diff] [blame] | 772 | handle_percpu_devid_irq, NULL, NULL); |
Rob Herring | d17cab4 | 2015-08-29 18:01:22 -0500 | [diff] [blame] | 773 | irq_set_status_flags(irq, IRQ_NOAUTOEN); |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 774 | } |
| 775 | /* SPIs */ |
| 776 | if (hw >= 32 && hw < gic_data.irq_nr) { |
Marc Zyngier | 0b6a3da | 2015-08-26 17:00:42 +0100 | [diff] [blame] | 777 | irq_domain_set_info(d, irq, hw, chip, d->host_data, |
Marc Zyngier | 443acc4 | 2014-11-24 14:35:09 +0000 | [diff] [blame] | 778 | handle_fasteoi_irq, NULL, NULL); |
Rob Herring | d17cab4 | 2015-08-29 18:01:22 -0500 | [diff] [blame] | 779 | irq_set_probe(irq); |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 780 | } |
Marc Zyngier | da33f31 | 2014-11-24 14:35:18 +0000 | [diff] [blame] | 781 | /* LPIs */ |
| 782 | if (hw >= 8192 && hw < GIC_ID_NR) { |
| 783 | if (!gic_dist_supports_lpis()) |
| 784 | return -EPERM; |
Marc Zyngier | 0b6a3da | 2015-08-26 17:00:42 +0100 | [diff] [blame] | 785 | irq_domain_set_info(d, irq, hw, chip, d->host_data, |
Marc Zyngier | da33f31 | 2014-11-24 14:35:18 +0000 | [diff] [blame] | 786 | handle_fasteoi_irq, NULL, NULL); |
Marc Zyngier | da33f31 | 2014-11-24 14:35:18 +0000 | [diff] [blame] | 787 | } |
| 788 | |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 789 | return 0; |
| 790 | } |
| 791 | |
| 792 | static int gic_irq_domain_xlate(struct irq_domain *d, |
| 793 | struct device_node *controller, |
| 794 | const u32 *intspec, unsigned int intsize, |
| 795 | unsigned long *out_hwirq, unsigned int *out_type) |
| 796 | { |
| 797 | if (d->of_node != controller) |
| 798 | return -EINVAL; |
| 799 | if (intsize < 3) |
| 800 | return -EINVAL; |
| 801 | |
| 802 | switch(intspec[0]) { |
| 803 | case 0: /* SPI */ |
| 804 | *out_hwirq = intspec[1] + 32; |
| 805 | break; |
| 806 | case 1: /* PPI */ |
| 807 | *out_hwirq = intspec[1] + 16; |
| 808 | break; |
Marc Zyngier | da33f31 | 2014-11-24 14:35:18 +0000 | [diff] [blame] | 809 | case GIC_IRQ_TYPE_LPI: /* LPI */ |
| 810 | *out_hwirq = intspec[1]; |
| 811 | break; |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 812 | default: |
| 813 | return -EINVAL; |
| 814 | } |
| 815 | |
| 816 | *out_type = intspec[2] & IRQ_TYPE_SENSE_MASK; |
| 817 | return 0; |
| 818 | } |
| 819 | |
Marc Zyngier | 443acc4 | 2014-11-24 14:35:09 +0000 | [diff] [blame] | 820 | static int gic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq, |
| 821 | unsigned int nr_irqs, void *arg) |
| 822 | { |
| 823 | int i, ret; |
| 824 | irq_hw_number_t hwirq; |
| 825 | unsigned int type = IRQ_TYPE_NONE; |
| 826 | struct of_phandle_args *irq_data = arg; |
| 827 | |
| 828 | ret = gic_irq_domain_xlate(domain, irq_data->np, irq_data->args, |
| 829 | irq_data->args_count, &hwirq, &type); |
| 830 | if (ret) |
| 831 | return ret; |
| 832 | |
| 833 | for (i = 0; i < nr_irqs; i++) |
| 834 | gic_irq_domain_map(domain, virq + i, hwirq + i); |
| 835 | |
| 836 | return 0; |
| 837 | } |
| 838 | |
| 839 | static void gic_irq_domain_free(struct irq_domain *domain, unsigned int virq, |
| 840 | unsigned int nr_irqs) |
| 841 | { |
| 842 | int i; |
| 843 | |
| 844 | for (i = 0; i < nr_irqs; i++) { |
| 845 | struct irq_data *d = irq_domain_get_irq_data(domain, virq + i); |
| 846 | irq_set_handler(virq + i, NULL); |
| 847 | irq_domain_reset_irq_data(d); |
| 848 | } |
| 849 | } |
| 850 | |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 851 | static const struct irq_domain_ops gic_irq_domain_ops = { |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 852 | .xlate = gic_irq_domain_xlate, |
Marc Zyngier | 443acc4 | 2014-11-24 14:35:09 +0000 | [diff] [blame] | 853 | .alloc = gic_irq_domain_alloc, |
| 854 | .free = gic_irq_domain_free, |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 855 | }; |
| 856 | |
Robert Richter | 6d4e11c | 2015-09-21 22:58:35 +0200 | [diff] [blame] | 857 | static void gicv3_enable_quirks(void) |
| 858 | { |
| 859 | if (cpus_have_cap(ARM64_WORKAROUND_CAVIUM_23154)) |
Robert Richter | 8ac2a17 | 2015-09-21 22:58:39 +0200 | [diff] [blame] | 860 | static_branch_enable(&is_cavium_thunderx); |
Robert Richter | 6d4e11c | 2015-09-21 22:58:35 +0200 | [diff] [blame] | 861 | } |
| 862 | |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 863 | static int __init gic_of_init(struct device_node *node, struct device_node *parent) |
| 864 | { |
| 865 | void __iomem *dist_base; |
Marc Zyngier | f5c1434 | 2014-11-24 14:35:10 +0000 | [diff] [blame] | 866 | struct redist_region *rdist_regs; |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 867 | u64 redist_stride; |
Marc Zyngier | f5c1434 | 2014-11-24 14:35:10 +0000 | [diff] [blame] | 868 | u32 nr_redist_regions; |
| 869 | u32 typer; |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 870 | u32 reg; |
| 871 | int gic_irqs; |
| 872 | int err; |
| 873 | int i; |
| 874 | |
| 875 | dist_base = of_iomap(node, 0); |
| 876 | if (!dist_base) { |
| 877 | pr_err("%s: unable to map gic dist registers\n", |
| 878 | node->full_name); |
| 879 | return -ENXIO; |
| 880 | } |
| 881 | |
| 882 | reg = readl_relaxed(dist_base + GICD_PIDR2) & GIC_PIDR2_ARCH_MASK; |
| 883 | if (reg != GIC_PIDR2_ARCH_GICv3 && reg != GIC_PIDR2_ARCH_GICv4) { |
| 884 | pr_err("%s: no distributor detected, giving up\n", |
| 885 | node->full_name); |
| 886 | err = -ENODEV; |
| 887 | goto out_unmap_dist; |
| 888 | } |
| 889 | |
Marc Zyngier | f5c1434 | 2014-11-24 14:35:10 +0000 | [diff] [blame] | 890 | if (of_property_read_u32(node, "#redistributor-regions", &nr_redist_regions)) |
| 891 | nr_redist_regions = 1; |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 892 | |
Marc Zyngier | f5c1434 | 2014-11-24 14:35:10 +0000 | [diff] [blame] | 893 | rdist_regs = kzalloc(sizeof(*rdist_regs) * nr_redist_regions, GFP_KERNEL); |
| 894 | if (!rdist_regs) { |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 895 | err = -ENOMEM; |
| 896 | goto out_unmap_dist; |
| 897 | } |
| 898 | |
Marc Zyngier | f5c1434 | 2014-11-24 14:35:10 +0000 | [diff] [blame] | 899 | for (i = 0; i < nr_redist_regions; i++) { |
| 900 | struct resource res; |
| 901 | int ret; |
| 902 | |
| 903 | ret = of_address_to_resource(node, 1 + i, &res); |
| 904 | rdist_regs[i].redist_base = of_iomap(node, 1 + i); |
| 905 | if (ret || !rdist_regs[i].redist_base) { |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 906 | pr_err("%s: couldn't map region %d\n", |
| 907 | node->full_name, i); |
| 908 | err = -ENODEV; |
| 909 | goto out_unmap_rdist; |
| 910 | } |
Marc Zyngier | f5c1434 | 2014-11-24 14:35:10 +0000 | [diff] [blame] | 911 | rdist_regs[i].phys_base = res.start; |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 912 | } |
| 913 | |
| 914 | if (of_property_read_u64(node, "redistributor-stride", &redist_stride)) |
| 915 | redist_stride = 0; |
| 916 | |
Marc Zyngier | 0b6a3da | 2015-08-26 17:00:42 +0100 | [diff] [blame] | 917 | if (!is_hyp_mode_available()) |
| 918 | static_key_slow_dec(&supports_deactivate); |
| 919 | |
| 920 | if (static_key_true(&supports_deactivate)) |
| 921 | pr_info("GIC: Using split EOI/Deactivate mode\n"); |
| 922 | |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 923 | gic_data.dist_base = dist_base; |
Marc Zyngier | f5c1434 | 2014-11-24 14:35:10 +0000 | [diff] [blame] | 924 | gic_data.redist_regions = rdist_regs; |
| 925 | gic_data.nr_redist_regions = nr_redist_regions; |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 926 | gic_data.redist_stride = redist_stride; |
| 927 | |
Robert Richter | 6d4e11c | 2015-09-21 22:58:35 +0200 | [diff] [blame] | 928 | gicv3_enable_quirks(); |
| 929 | |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 930 | /* |
| 931 | * Find out how many interrupts are supported. |
| 932 | * The GIC only supports up to 1020 interrupt sources (SGI+PPI+SPI) |
| 933 | */ |
Marc Zyngier | f5c1434 | 2014-11-24 14:35:10 +0000 | [diff] [blame] | 934 | typer = readl_relaxed(gic_data.dist_base + GICD_TYPER); |
| 935 | gic_data.rdists.id_bits = GICD_TYPER_ID_BITS(typer); |
| 936 | gic_irqs = GICD_TYPER_IRQS(typer); |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 937 | if (gic_irqs > 1020) |
| 938 | gic_irqs = 1020; |
| 939 | gic_data.irq_nr = gic_irqs; |
| 940 | |
| 941 | gic_data.domain = irq_domain_add_tree(node, &gic_irq_domain_ops, |
| 942 | &gic_data); |
Marc Zyngier | f5c1434 | 2014-11-24 14:35:10 +0000 | [diff] [blame] | 943 | gic_data.rdists.rdist = alloc_percpu(typeof(*gic_data.rdists.rdist)); |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 944 | |
Marc Zyngier | f5c1434 | 2014-11-24 14:35:10 +0000 | [diff] [blame] | 945 | if (WARN_ON(!gic_data.domain) || WARN_ON(!gic_data.rdists.rdist)) { |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 946 | err = -ENOMEM; |
| 947 | goto out_free; |
| 948 | } |
| 949 | |
| 950 | set_handle_irq(gic_handle_irq); |
| 951 | |
Marc Zyngier | da33f31 | 2014-11-24 14:35:18 +0000 | [diff] [blame] | 952 | if (IS_ENABLED(CONFIG_ARM_GIC_V3_ITS) && gic_dist_supports_lpis()) |
| 953 | its_init(node, &gic_data.rdists, gic_data.domain); |
| 954 | |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 955 | gic_smp_init(); |
| 956 | gic_dist_init(); |
| 957 | gic_cpu_init(); |
Sudeep Holla | 3708d52 | 2014-08-26 16:03:35 +0100 | [diff] [blame] | 958 | gic_cpu_pm_init(); |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 959 | |
| 960 | return 0; |
| 961 | |
| 962 | out_free: |
| 963 | if (gic_data.domain) |
| 964 | irq_domain_remove(gic_data.domain); |
Marc Zyngier | f5c1434 | 2014-11-24 14:35:10 +0000 | [diff] [blame] | 965 | free_percpu(gic_data.rdists.rdist); |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 966 | out_unmap_rdist: |
Marc Zyngier | f5c1434 | 2014-11-24 14:35:10 +0000 | [diff] [blame] | 967 | for (i = 0; i < nr_redist_regions; i++) |
| 968 | if (rdist_regs[i].redist_base) |
| 969 | iounmap(rdist_regs[i].redist_base); |
| 970 | kfree(rdist_regs); |
Marc Zyngier | 021f653 | 2014-06-30 16:01:31 +0100 | [diff] [blame] | 971 | out_unmap_dist: |
| 972 | iounmap(dist_base); |
| 973 | return err; |
| 974 | } |
| 975 | |
| 976 | IRQCHIP_DECLARE(gic_v3, "arm,gic-v3", gic_of_init); |