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
tegra_ictlr_write_mask(struct irq_data * d,unsigned long reg)91 static inline void tegra_ictlr_write_mask(struct irq_data *d, unsigned long reg)
92 {
93 void __iomem *base = (void __iomem __force *)d->chip_data;
94 u32 mask;
95
96 mask = BIT(d->hwirq % 32);
97 writel_relaxed(mask, base + reg);
98 }
99
tegra_mask(struct irq_data * d)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
tegra_unmask(struct irq_data * d)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
tegra_eoi(struct irq_data * d)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
tegra_retrigger(struct irq_data * d)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
tegra_set_wake(struct irq_data * d,unsigned int enable)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
tegra_ictlr_suspend(void)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(GENMASK(31, 0), ictlr + ICTLR_COP_IER_CLR);
161
162 /* Disable CPU interrupts */
163 writel_relaxed(GENMASK(31, 0), 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
tegra_ictlr_resume(void)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(GENMASK(31, 0), 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(GENMASK(31, 0), 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
tegra_ictlr_syscore_init(void)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
tegra_ictlr_syscore_init(void)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
tegra_ictlr_domain_translate(struct irq_domain * d,struct irq_fwspec * fwspec,unsigned long * hwirq,unsigned int * type)224 static int tegra_ictlr_domain_translate(struct irq_domain *d,
225 struct irq_fwspec *fwspec,
226 unsigned long *hwirq,
227 unsigned int *type)
228 {
229 if (is_of_node(fwspec->fwnode)) {
230 if (fwspec->param_count != 3)
231 return -EINVAL;
232
233 /* No PPI should point to this domain */
234 if (fwspec->param[0] != 0)
235 return -EINVAL;
236
237 *hwirq = fwspec->param[1];
238 *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
239 return 0;
240 }
241
242 return -EINVAL;
243 }
244
tegra_ictlr_domain_alloc(struct irq_domain * domain,unsigned int virq,unsigned int nr_irqs,void * data)245 static int tegra_ictlr_domain_alloc(struct irq_domain *domain,
246 unsigned int virq,
247 unsigned int nr_irqs, void *data)
248 {
249 struct irq_fwspec *fwspec = data;
250 struct irq_fwspec parent_fwspec;
251 struct tegra_ictlr_info *info = domain->host_data;
252 irq_hw_number_t hwirq;
253 unsigned int i;
254
255 if (fwspec->param_count != 3)
256 return -EINVAL; /* Not GIC compliant */
257 if (fwspec->param[0] != GIC_SPI)
258 return -EINVAL; /* No PPI should point to this domain */
259
260 hwirq = fwspec->param[1];
261 if (hwirq >= (num_ictlrs * 32))
262 return -EINVAL;
263
264 for (i = 0; i < nr_irqs; i++) {
265 int ictlr = (hwirq + i) / 32;
266
267 irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
268 &tegra_ictlr_chip,
269 (void __force *)info->base[ictlr]);
270 }
271
272 parent_fwspec = *fwspec;
273 parent_fwspec.fwnode = domain->parent->fwnode;
274 return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs,
275 &parent_fwspec);
276 }
277
278 static const struct irq_domain_ops tegra_ictlr_domain_ops = {
279 .translate = tegra_ictlr_domain_translate,
280 .alloc = tegra_ictlr_domain_alloc,
281 .free = irq_domain_free_irqs_common,
282 };
283
tegra_ictlr_init(struct device_node * node,struct device_node * parent)284 static int __init tegra_ictlr_init(struct device_node *node,
285 struct device_node *parent)
286 {
287 struct irq_domain *parent_domain, *domain;
288 const struct of_device_id *match;
289 const struct tegra_ictlr_soc *soc;
290 unsigned int i;
291 int err;
292
293 if (!parent) {
294 pr_err("%pOF: no parent, giving up\n", node);
295 return -ENODEV;
296 }
297
298 parent_domain = irq_find_host(parent);
299 if (!parent_domain) {
300 pr_err("%pOF: unable to obtain parent domain\n", node);
301 return -ENXIO;
302 }
303
304 match = of_match_node(ictlr_matches, node);
305 if (!match) /* Should never happen... */
306 return -ENODEV;
307
308 soc = match->data;
309
310 lic = kzalloc(sizeof(*lic), GFP_KERNEL);
311 if (!lic)
312 return -ENOMEM;
313
314 for (i = 0; i < TEGRA_MAX_NUM_ICTLRS; i++) {
315 void __iomem *base;
316
317 base = of_iomap(node, i);
318 if (!base)
319 break;
320
321 lic->base[i] = base;
322
323 /* Disable all interrupts */
324 writel_relaxed(GENMASK(31, 0), base + ICTLR_CPU_IER_CLR);
325 /* All interrupts target IRQ */
326 writel_relaxed(0, base + ICTLR_CPU_IEP_CLASS);
327
328 num_ictlrs++;
329 }
330
331 if (!num_ictlrs) {
332 pr_err("%pOF: no valid regions, giving up\n", node);
333 err = -ENOMEM;
334 goto out_free;
335 }
336
337 WARN(num_ictlrs != soc->num_ictlrs,
338 "%pOF: Found %u interrupt controllers in DT; expected %u.\n",
339 node, num_ictlrs, soc->num_ictlrs);
340
341
342 domain = irq_domain_add_hierarchy(parent_domain, 0, num_ictlrs * 32,
343 node, &tegra_ictlr_domain_ops,
344 lic);
345 if (!domain) {
346 pr_err("%pOF: failed to allocated domain\n", node);
347 err = -ENOMEM;
348 goto out_unmap;
349 }
350
351 tegra_ictlr_syscore_init();
352
353 pr_info("%pOF: %d interrupts forwarded to %pOF\n",
354 node, num_ictlrs * 32, parent);
355
356 return 0;
357
358 out_unmap:
359 for (i = 0; i < num_ictlrs; i++)
360 iounmap(lic->base[i]);
361 out_free:
362 kfree(lic);
363 return err;
364 }
365
366 IRQCHIP_DECLARE(tegra20_ictlr, "nvidia,tegra20-ictlr", tegra_ictlr_init);
367 IRQCHIP_DECLARE(tegra30_ictlr, "nvidia,tegra30-ictlr", tegra_ictlr_init);
368 IRQCHIP_DECLARE(tegra210_ictlr, "nvidia,tegra210-ictlr", tegra_ictlr_init);
369