1 /* 2 * Driver code for Tegra's Legacy Interrupt Controller 3 * 4 * Author: Marc Zyngier <marc.zyngier@arm.com> 5 * 6 * Heavily based on the original arch/arm/mach-tegra/irq.c code: 7 * Copyright (C) 2011 Google, Inc. 8 * 9 * Author: 10 * Colin Cross <ccross@android.com> 11 * 12 * Copyright (C) 2010,2013, NVIDIA Corporation 13 * 14 * This software is licensed under the terms of the GNU General Public 15 * License version 2, as published by the Free Software Foundation, and 16 * may be copied, distributed, and modified under those terms. 17 * 18 * This program is distributed in the hope that it will be useful, 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 * GNU General Public License for more details. 22 * 23 */ 24 25 #include <linux/io.h> 26 #include <linux/irq.h> 27 #include <linux/irqchip.h> 28 #include <linux/irqdomain.h> 29 #include <linux/of_address.h> 30 #include <linux/slab.h> 31 #include <linux/syscore_ops.h> 32 33 #include <dt-bindings/interrupt-controller/arm-gic.h> 34 35 #define ICTLR_CPU_IEP_VFIQ 0x08 36 #define ICTLR_CPU_IEP_FIR 0x14 37 #define ICTLR_CPU_IEP_FIR_SET 0x18 38 #define ICTLR_CPU_IEP_FIR_CLR 0x1c 39 40 #define ICTLR_CPU_IER 0x20 41 #define ICTLR_CPU_IER_SET 0x24 42 #define ICTLR_CPU_IER_CLR 0x28 43 #define ICTLR_CPU_IEP_CLASS 0x2C 44 45 #define ICTLR_COP_IER 0x30 46 #define ICTLR_COP_IER_SET 0x34 47 #define ICTLR_COP_IER_CLR 0x38 48 #define ICTLR_COP_IEP_CLASS 0x3c 49 50 #define TEGRA_MAX_NUM_ICTLRS 6 51 52 static unsigned int num_ictlrs; 53 54 struct tegra_ictlr_soc { 55 unsigned int num_ictlrs; 56 }; 57 58 static const struct tegra_ictlr_soc tegra20_ictlr_soc = { 59 .num_ictlrs = 4, 60 }; 61 62 static const struct tegra_ictlr_soc tegra30_ictlr_soc = { 63 .num_ictlrs = 5, 64 }; 65 66 static const struct tegra_ictlr_soc tegra210_ictlr_soc = { 67 .num_ictlrs = 6, 68 }; 69 70 static const struct of_device_id ictlr_matches[] = { 71 { .compatible = "nvidia,tegra210-ictlr", .data = &tegra210_ictlr_soc }, 72 { .compatible = "nvidia,tegra30-ictlr", .data = &tegra30_ictlr_soc }, 73 { .compatible = "nvidia,tegra20-ictlr", .data = &tegra20_ictlr_soc }, 74 { } 75 }; 76 77 struct tegra_ictlr_info { 78 void __iomem *base[TEGRA_MAX_NUM_ICTLRS]; 79 #ifdef CONFIG_PM_SLEEP 80 u32 cop_ier[TEGRA_MAX_NUM_ICTLRS]; 81 u32 cop_iep[TEGRA_MAX_NUM_ICTLRS]; 82 u32 cpu_ier[TEGRA_MAX_NUM_ICTLRS]; 83 u32 cpu_iep[TEGRA_MAX_NUM_ICTLRS]; 84 85 u32 ictlr_wake_mask[TEGRA_MAX_NUM_ICTLRS]; 86 #endif 87 }; 88 89 static struct tegra_ictlr_info *lic; 90 91 static inline void tegra_ictlr_write_mask(struct irq_data *d, unsigned long reg) 92 { 93 void __iomem *base = d->chip_data; 94 u32 mask; 95 96 mask = BIT(d->hwirq % 32); 97 writel_relaxed(mask, base + reg); 98 } 99 100 static void tegra_mask(struct irq_data *d) 101 { 102 tegra_ictlr_write_mask(d, ICTLR_CPU_IER_CLR); 103 irq_chip_mask_parent(d); 104 } 105 106 static void tegra_unmask(struct irq_data *d) 107 { 108 tegra_ictlr_write_mask(d, ICTLR_CPU_IER_SET); 109 irq_chip_unmask_parent(d); 110 } 111 112 static void tegra_eoi(struct irq_data *d) 113 { 114 tegra_ictlr_write_mask(d, ICTLR_CPU_IEP_FIR_CLR); 115 irq_chip_eoi_parent(d); 116 } 117 118 static int tegra_retrigger(struct irq_data *d) 119 { 120 tegra_ictlr_write_mask(d, ICTLR_CPU_IEP_FIR_SET); 121 return irq_chip_retrigger_hierarchy(d); 122 } 123 124 #ifdef CONFIG_PM_SLEEP 125 static int tegra_set_wake(struct irq_data *d, unsigned int enable) 126 { 127 u32 irq = d->hwirq; 128 u32 index, mask; 129 130 index = (irq / 32); 131 mask = BIT(irq % 32); 132 if (enable) 133 lic->ictlr_wake_mask[index] |= mask; 134 else 135 lic->ictlr_wake_mask[index] &= ~mask; 136 137 /* 138 * Do *not* call into the parent, as the GIC doesn't have any 139 * wake-up facility... 140 */ 141 return 0; 142 } 143 144 static int tegra_ictlr_suspend(void) 145 { 146 unsigned long flags; 147 unsigned int i; 148 149 local_irq_save(flags); 150 for (i = 0; i < num_ictlrs; i++) { 151 void __iomem *ictlr = lic->base[i]; 152 153 /* Save interrupt state */ 154 lic->cpu_ier[i] = readl_relaxed(ictlr + ICTLR_CPU_IER); 155 lic->cpu_iep[i] = readl_relaxed(ictlr + ICTLR_CPU_IEP_CLASS); 156 lic->cop_ier[i] = readl_relaxed(ictlr + ICTLR_COP_IER); 157 lic->cop_iep[i] = readl_relaxed(ictlr + ICTLR_COP_IEP_CLASS); 158 159 /* Disable COP interrupts */ 160 writel_relaxed(~0ul, ictlr + ICTLR_COP_IER_CLR); 161 162 /* Disable CPU interrupts */ 163 writel_relaxed(~0ul, ictlr + ICTLR_CPU_IER_CLR); 164 165 /* Enable the wakeup sources of ictlr */ 166 writel_relaxed(lic->ictlr_wake_mask[i], ictlr + ICTLR_CPU_IER_SET); 167 } 168 local_irq_restore(flags); 169 170 return 0; 171 } 172 173 static void tegra_ictlr_resume(void) 174 { 175 unsigned long flags; 176 unsigned int i; 177 178 local_irq_save(flags); 179 for (i = 0; i < num_ictlrs; i++) { 180 void __iomem *ictlr = lic->base[i]; 181 182 writel_relaxed(lic->cpu_iep[i], 183 ictlr + ICTLR_CPU_IEP_CLASS); 184 writel_relaxed(~0ul, ictlr + ICTLR_CPU_IER_CLR); 185 writel_relaxed(lic->cpu_ier[i], 186 ictlr + ICTLR_CPU_IER_SET); 187 writel_relaxed(lic->cop_iep[i], 188 ictlr + ICTLR_COP_IEP_CLASS); 189 writel_relaxed(~0ul, ictlr + ICTLR_COP_IER_CLR); 190 writel_relaxed(lic->cop_ier[i], 191 ictlr + ICTLR_COP_IER_SET); 192 } 193 local_irq_restore(flags); 194 } 195 196 static struct syscore_ops tegra_ictlr_syscore_ops = { 197 .suspend = tegra_ictlr_suspend, 198 .resume = tegra_ictlr_resume, 199 }; 200 201 static void tegra_ictlr_syscore_init(void) 202 { 203 register_syscore_ops(&tegra_ictlr_syscore_ops); 204 } 205 #else 206 #define tegra_set_wake NULL 207 static inline void tegra_ictlr_syscore_init(void) {} 208 #endif 209 210 static struct irq_chip tegra_ictlr_chip = { 211 .name = "LIC", 212 .irq_eoi = tegra_eoi, 213 .irq_mask = tegra_mask, 214 .irq_unmask = tegra_unmask, 215 .irq_retrigger = tegra_retrigger, 216 .irq_set_wake = tegra_set_wake, 217 .irq_set_type = irq_chip_set_type_parent, 218 .flags = IRQCHIP_MASK_ON_SUSPEND, 219 #ifdef CONFIG_SMP 220 .irq_set_affinity = irq_chip_set_affinity_parent, 221 #endif 222 }; 223 224 static int tegra_ictlr_domain_xlate(struct irq_domain *domain, 225 struct device_node *controller, 226 const u32 *intspec, 227 unsigned int intsize, 228 unsigned long *out_hwirq, 229 unsigned int *out_type) 230 { 231 if (domain->of_node != controller) 232 return -EINVAL; /* Shouldn't happen, really... */ 233 if (intsize != 3) 234 return -EINVAL; /* Not GIC compliant */ 235 if (intspec[0] != GIC_SPI) 236 return -EINVAL; /* No PPI should point to this domain */ 237 238 *out_hwirq = intspec[1]; 239 *out_type = intspec[2]; 240 return 0; 241 } 242 243 static int tegra_ictlr_domain_alloc(struct irq_domain *domain, 244 unsigned int virq, 245 unsigned int nr_irqs, void *data) 246 { 247 struct of_phandle_args *args = data; 248 struct of_phandle_args parent_args; 249 struct tegra_ictlr_info *info = domain->host_data; 250 irq_hw_number_t hwirq; 251 unsigned int i; 252 253 if (args->args_count != 3) 254 return -EINVAL; /* Not GIC compliant */ 255 if (args->args[0] != GIC_SPI) 256 return -EINVAL; /* No PPI should point to this domain */ 257 258 hwirq = args->args[1]; 259 if (hwirq >= (num_ictlrs * 32)) 260 return -EINVAL; 261 262 for (i = 0; i < nr_irqs; i++) { 263 int ictlr = (hwirq + i) / 32; 264 265 irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i, 266 &tegra_ictlr_chip, 267 info->base[ictlr]); 268 } 269 270 parent_args = *args; 271 parent_args.np = domain->parent->of_node; 272 return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, &parent_args); 273 } 274 275 static void tegra_ictlr_domain_free(struct irq_domain *domain, 276 unsigned int virq, 277 unsigned int nr_irqs) 278 { 279 unsigned int i; 280 281 for (i = 0; i < nr_irqs; i++) { 282 struct irq_data *d = irq_domain_get_irq_data(domain, virq + i); 283 irq_domain_reset_irq_data(d); 284 } 285 } 286 287 static const struct irq_domain_ops tegra_ictlr_domain_ops = { 288 .xlate = tegra_ictlr_domain_xlate, 289 .alloc = tegra_ictlr_domain_alloc, 290 .free = tegra_ictlr_domain_free, 291 }; 292 293 static int __init tegra_ictlr_init(struct device_node *node, 294 struct device_node *parent) 295 { 296 struct irq_domain *parent_domain, *domain; 297 const struct of_device_id *match; 298 const struct tegra_ictlr_soc *soc; 299 unsigned int i; 300 int err; 301 302 if (!parent) { 303 pr_err("%s: no parent, giving up\n", node->full_name); 304 return -ENODEV; 305 } 306 307 parent_domain = irq_find_host(parent); 308 if (!parent_domain) { 309 pr_err("%s: unable to obtain parent domain\n", node->full_name); 310 return -ENXIO; 311 } 312 313 match = of_match_node(ictlr_matches, node); 314 if (!match) /* Should never happen... */ 315 return -ENODEV; 316 317 soc = match->data; 318 319 lic = kzalloc(sizeof(*lic), GFP_KERNEL); 320 if (!lic) 321 return -ENOMEM; 322 323 for (i = 0; i < TEGRA_MAX_NUM_ICTLRS; i++) { 324 void __iomem *base; 325 326 base = of_iomap(node, i); 327 if (!base) 328 break; 329 330 lic->base[i] = base; 331 332 /* Disable all interrupts */ 333 writel_relaxed(~0UL, base + ICTLR_CPU_IER_CLR); 334 /* All interrupts target IRQ */ 335 writel_relaxed(0, base + ICTLR_CPU_IEP_CLASS); 336 337 num_ictlrs++; 338 } 339 340 if (!num_ictlrs) { 341 pr_err("%s: no valid regions, giving up\n", node->full_name); 342 err = -ENOMEM; 343 goto out_free; 344 } 345 346 WARN(num_ictlrs != soc->num_ictlrs, 347 "%s: Found %u interrupt controllers in DT; expected %u.\n", 348 node->full_name, num_ictlrs, soc->num_ictlrs); 349 350 351 domain = irq_domain_add_hierarchy(parent_domain, 0, num_ictlrs * 32, 352 node, &tegra_ictlr_domain_ops, 353 lic); 354 if (!domain) { 355 pr_err("%s: failed to allocated domain\n", node->full_name); 356 err = -ENOMEM; 357 goto out_unmap; 358 } 359 360 tegra_ictlr_syscore_init(); 361 362 pr_info("%s: %d interrupts forwarded to %s\n", 363 node->full_name, num_ictlrs * 32, parent->full_name); 364 365 return 0; 366 367 out_unmap: 368 for (i = 0; i < num_ictlrs; i++) 369 iounmap(lic->base[i]); 370 out_free: 371 kfree(lic); 372 return err; 373 } 374 375 IRQCHIP_DECLARE(tegra20_ictlr, "nvidia,tegra20-ictlr", tegra_ictlr_init); 376 IRQCHIP_DECLARE(tegra30_ictlr, "nvidia,tegra30-ictlr", tegra_ictlr_init); 377 IRQCHIP_DECLARE(tegra210_ictlr, "nvidia,tegra210-ictlr", tegra_ictlr_init); 378