1 // SPDX-License-Identifier: GPL-2.0
3 * Renesas RZ/G2L IRQC Driver
5 * Copyright (C) 2022 Renesas Electronics Corporation.
7 * Author: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
10 #include <linux/bitfield.h>
11 #include <linux/clk.h>
12 #include <linux/err.h>
14 #include <linux/irqchip.h>
15 #include <linux/irqdomain.h>
16 #include <linux/of_address.h>
17 #include <linux/of_platform.h>
18 #include <linux/pm_runtime.h>
19 #include <linux/reset.h>
20 #include <linux/spinlock.h>
21 #include <linux/syscore_ops.h>
23 #define IRQC_IRQ_START 1
24 #define IRQC_IRQ_COUNT 8
25 #define IRQC_TINT_START (IRQC_IRQ_START + IRQC_IRQ_COUNT)
26 #define IRQC_TINT_COUNT 32
27 #define IRQC_NUM_IRQ (IRQC_TINT_START + IRQC_TINT_COUNT)
32 #define TITSR(n) (0x24 + (n) * 4)
33 #define TITSR0_MAX_INT 16
34 #define TITSEL_WIDTH 0x2
35 #define TSSR(n) (0x30 + ((n) * 4))
37 #define TSSEL_SHIFT(n) (8 * (n))
38 #define TSSEL_MASK GENMASK(7, 0)
41 #define TSSR_OFFSET(n) ((n) % 4)
42 #define TSSR_INDEX(n) ((n) / 4)
44 #define TITSR_TITSEL_EDGE_RISING 0
45 #define TITSR_TITSEL_EDGE_FALLING 1
46 #define TITSR_TITSEL_LEVEL_HIGH 2
47 #define TITSR_TITSEL_LEVEL_LOW 3
49 #define IITSR_IITSEL(n, sense) ((sense) << ((n) * 2))
50 #define IITSR_IITSEL_LEVEL_LOW 0
51 #define IITSR_IITSEL_EDGE_FALLING 1
52 #define IITSR_IITSEL_EDGE_RISING 2
53 #define IITSR_IITSEL_EDGE_BOTH 3
54 #define IITSR_IITSEL_MASK(n) IITSR_IITSEL((n), 3)
56 #define TINT_EXTRACT_HWIRQ(x) FIELD_GET(GENMASK(15, 0), (x))
57 #define TINT_EXTRACT_GPIOINT(x) FIELD_GET(GENMASK(31, 16), (x))
60 * struct rzg2l_irqc_reg_cache - registers cache (necessary for suspend/resume)
61 * @iitsr: IITSR register
62 * @titsr: TITSR registers
64 struct rzg2l_irqc_reg_cache {
70 * struct rzg2l_irqc_priv - IRQ controller private data structure
71 * @base: Controller's base address
72 * @fwspec: IRQ firmware specific data
73 * @lock: Lock to serialize access to hardware registers
74 * @cache: Registers cache for suspend/resume
76 static struct rzg2l_irqc_priv {
78 struct irq_fwspec fwspec[IRQC_NUM_IRQ];
80 struct rzg2l_irqc_reg_cache cache;
83 static struct rzg2l_irqc_priv *irq_data_to_priv(struct irq_data *data)
85 return data->domain->host_data;
88 static void rzg2l_irq_eoi(struct irq_data *d)
90 unsigned int hw_irq = irqd_to_hwirq(d) - IRQC_IRQ_START;
91 struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
92 u32 bit = BIT(hw_irq);
95 iscr = readl_relaxed(priv->base + ISCR);
96 iitsr = readl_relaxed(priv->base + IITSR);
99 * ISCR can only be cleared if the type is falling-edge, rising-edge or
100 * falling/rising-edge.
102 if ((iscr & bit) && (iitsr & IITSR_IITSEL_MASK(hw_irq)))
103 writel_relaxed(iscr & ~bit, priv->base + ISCR);
106 static void rzg2l_tint_eoi(struct irq_data *d)
108 unsigned int hw_irq = irqd_to_hwirq(d) - IRQC_TINT_START;
109 struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
110 u32 bit = BIT(hw_irq);
113 reg = readl_relaxed(priv->base + TSCR);
115 writel_relaxed(reg & ~bit, priv->base + TSCR);
118 static void rzg2l_irqc_eoi(struct irq_data *d)
120 struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
121 unsigned int hw_irq = irqd_to_hwirq(d);
123 raw_spin_lock(&priv->lock);
124 if (hw_irq >= IRQC_IRQ_START && hw_irq <= IRQC_IRQ_COUNT)
126 else if (hw_irq >= IRQC_TINT_START && hw_irq < IRQC_NUM_IRQ)
128 raw_spin_unlock(&priv->lock);
129 irq_chip_eoi_parent(d);
132 static void rzg2l_irqc_irq_disable(struct irq_data *d)
134 unsigned int hw_irq = irqd_to_hwirq(d);
136 if (hw_irq >= IRQC_TINT_START && hw_irq < IRQC_NUM_IRQ) {
137 struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
138 u32 offset = hw_irq - IRQC_TINT_START;
139 u32 tssr_offset = TSSR_OFFSET(offset);
140 u8 tssr_index = TSSR_INDEX(offset);
143 raw_spin_lock(&priv->lock);
144 reg = readl_relaxed(priv->base + TSSR(tssr_index));
145 reg &= ~(TSSEL_MASK << TSSEL_SHIFT(tssr_offset));
146 writel_relaxed(reg, priv->base + TSSR(tssr_index));
147 raw_spin_unlock(&priv->lock);
149 irq_chip_disable_parent(d);
152 static void rzg2l_irqc_irq_enable(struct irq_data *d)
154 unsigned int hw_irq = irqd_to_hwirq(d);
156 if (hw_irq >= IRQC_TINT_START && hw_irq < IRQC_NUM_IRQ) {
157 unsigned long tint = (uintptr_t)irq_data_get_irq_chip_data(d);
158 struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
159 u32 offset = hw_irq - IRQC_TINT_START;
160 u32 tssr_offset = TSSR_OFFSET(offset);
161 u8 tssr_index = TSSR_INDEX(offset);
164 raw_spin_lock(&priv->lock);
165 reg = readl_relaxed(priv->base + TSSR(tssr_index));
166 reg |= (TIEN | tint) << TSSEL_SHIFT(tssr_offset);
167 writel_relaxed(reg, priv->base + TSSR(tssr_index));
168 raw_spin_unlock(&priv->lock);
170 irq_chip_enable_parent(d);
173 static int rzg2l_irq_set_type(struct irq_data *d, unsigned int type)
175 unsigned int hw_irq = irqd_to_hwirq(d) - IRQC_IRQ_START;
176 struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
179 switch (type & IRQ_TYPE_SENSE_MASK) {
180 case IRQ_TYPE_LEVEL_LOW:
181 sense = IITSR_IITSEL_LEVEL_LOW;
184 case IRQ_TYPE_EDGE_FALLING:
185 sense = IITSR_IITSEL_EDGE_FALLING;
188 case IRQ_TYPE_EDGE_RISING:
189 sense = IITSR_IITSEL_EDGE_RISING;
192 case IRQ_TYPE_EDGE_BOTH:
193 sense = IITSR_IITSEL_EDGE_BOTH;
200 raw_spin_lock(&priv->lock);
201 tmp = readl_relaxed(priv->base + IITSR);
202 tmp &= ~IITSR_IITSEL_MASK(hw_irq);
203 tmp |= IITSR_IITSEL(hw_irq, sense);
204 writel_relaxed(tmp, priv->base + IITSR);
205 raw_spin_unlock(&priv->lock);
210 static int rzg2l_tint_set_edge(struct irq_data *d, unsigned int type)
212 struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
213 unsigned int hwirq = irqd_to_hwirq(d);
214 u32 titseln = hwirq - IRQC_TINT_START;
218 switch (type & IRQ_TYPE_SENSE_MASK) {
219 case IRQ_TYPE_EDGE_RISING:
220 sense = TITSR_TITSEL_EDGE_RISING;
223 case IRQ_TYPE_EDGE_FALLING:
224 sense = TITSR_TITSEL_EDGE_FALLING;
232 if (titseln >= TITSR0_MAX_INT) {
233 titseln -= TITSR0_MAX_INT;
237 raw_spin_lock(&priv->lock);
238 reg = readl_relaxed(priv->base + TITSR(index));
239 reg &= ~(IRQ_MASK << (titseln * TITSEL_WIDTH));
240 reg |= sense << (titseln * TITSEL_WIDTH);
241 writel_relaxed(reg, priv->base + TITSR(index));
242 raw_spin_unlock(&priv->lock);
247 static int rzg2l_irqc_set_type(struct irq_data *d, unsigned int type)
249 unsigned int hw_irq = irqd_to_hwirq(d);
252 if (hw_irq >= IRQC_IRQ_START && hw_irq <= IRQC_IRQ_COUNT)
253 ret = rzg2l_irq_set_type(d, type);
254 else if (hw_irq >= IRQC_TINT_START && hw_irq < IRQC_NUM_IRQ)
255 ret = rzg2l_tint_set_edge(d, type);
259 return irq_chip_set_type_parent(d, IRQ_TYPE_LEVEL_HIGH);
262 static int rzg2l_irqc_irq_suspend(void)
264 struct rzg2l_irqc_reg_cache *cache = &rzg2l_irqc_data->cache;
265 void __iomem *base = rzg2l_irqc_data->base;
267 cache->iitsr = readl_relaxed(base + IITSR);
268 for (u8 i = 0; i < 2; i++)
269 cache->titsr[i] = readl_relaxed(base + TITSR(i));
274 static void rzg2l_irqc_irq_resume(void)
276 struct rzg2l_irqc_reg_cache *cache = &rzg2l_irqc_data->cache;
277 void __iomem *base = rzg2l_irqc_data->base;
280 * Restore only interrupt type. TSSRx will be restored at the
281 * request of pin controller to avoid spurious interrupts due
282 * to invalid PIN states.
284 for (u8 i = 0; i < 2; i++)
285 writel_relaxed(cache->titsr[i], base + TITSR(i));
286 writel_relaxed(cache->iitsr, base + IITSR);
289 static struct syscore_ops rzg2l_irqc_syscore_ops = {
290 .suspend = rzg2l_irqc_irq_suspend,
291 .resume = rzg2l_irqc_irq_resume,
294 static const struct irq_chip irqc_chip = {
295 .name = "rzg2l-irqc",
296 .irq_eoi = rzg2l_irqc_eoi,
297 .irq_mask = irq_chip_mask_parent,
298 .irq_unmask = irq_chip_unmask_parent,
299 .irq_disable = rzg2l_irqc_irq_disable,
300 .irq_enable = rzg2l_irqc_irq_enable,
301 .irq_get_irqchip_state = irq_chip_get_parent_state,
302 .irq_set_irqchip_state = irq_chip_set_parent_state,
303 .irq_retrigger = irq_chip_retrigger_hierarchy,
304 .irq_set_type = rzg2l_irqc_set_type,
305 .irq_set_affinity = irq_chip_set_affinity_parent,
306 .flags = IRQCHIP_MASK_ON_SUSPEND |
307 IRQCHIP_SET_TYPE_MASKED |
308 IRQCHIP_SKIP_SET_WAKE,
311 static int rzg2l_irqc_alloc(struct irq_domain *domain, unsigned int virq,
312 unsigned int nr_irqs, void *arg)
314 struct rzg2l_irqc_priv *priv = domain->host_data;
315 unsigned long tint = 0;
316 irq_hw_number_t hwirq;
320 ret = irq_domain_translate_twocell(domain, arg, &hwirq, &type);
325 * For TINT interrupts ie where pinctrl driver is child of irqc domain
326 * the hwirq and TINT are encoded in fwspec->param[0].
327 * hwirq for TINT range from 9-40, hwirq is embedded 0-15 bits and TINT
328 * from 16-31 bits. TINT from the pinctrl driver needs to be programmed
329 * in IRQC registers to enable a given gpio pin as interrupt.
331 if (hwirq > IRQC_IRQ_COUNT) {
332 tint = TINT_EXTRACT_GPIOINT(hwirq);
333 hwirq = TINT_EXTRACT_HWIRQ(hwirq);
335 if (hwirq < IRQC_TINT_START)
339 if (hwirq > (IRQC_NUM_IRQ - 1))
342 ret = irq_domain_set_hwirq_and_chip(domain, virq, hwirq, &irqc_chip,
343 (void *)(uintptr_t)tint);
347 return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, &priv->fwspec[hwirq]);
350 static const struct irq_domain_ops rzg2l_irqc_domain_ops = {
351 .alloc = rzg2l_irqc_alloc,
352 .free = irq_domain_free_irqs_common,
353 .translate = irq_domain_translate_twocell,
356 static int rzg2l_irqc_parse_interrupts(struct rzg2l_irqc_priv *priv,
357 struct device_node *np)
359 struct of_phandle_args map;
363 for (i = 0; i < IRQC_NUM_IRQ; i++) {
364 ret = of_irq_parse_one(np, i, &map);
367 of_phandle_args_to_fwspec(np, map.args, map.args_count,
374 static int rzg2l_irqc_init(struct device_node *node, struct device_node *parent)
376 struct irq_domain *irq_domain, *parent_domain;
377 struct platform_device *pdev;
378 struct reset_control *resetn;
381 pdev = of_find_device_by_node(node);
385 parent_domain = irq_find_host(parent);
386 if (!parent_domain) {
387 dev_err(&pdev->dev, "cannot find parent domain\n");
391 rzg2l_irqc_data = devm_kzalloc(&pdev->dev, sizeof(*rzg2l_irqc_data), GFP_KERNEL);
392 if (!rzg2l_irqc_data)
395 rzg2l_irqc_data->base = devm_of_iomap(&pdev->dev, pdev->dev.of_node, 0, NULL);
396 if (IS_ERR(rzg2l_irqc_data->base))
397 return PTR_ERR(rzg2l_irqc_data->base);
399 ret = rzg2l_irqc_parse_interrupts(rzg2l_irqc_data, node);
401 dev_err(&pdev->dev, "cannot parse interrupts: %d\n", ret);
405 resetn = devm_reset_control_get_exclusive(&pdev->dev, NULL);
407 return PTR_ERR(resetn);
409 ret = reset_control_deassert(resetn);
411 dev_err(&pdev->dev, "failed to deassert resetn pin, %d\n", ret);
415 pm_runtime_enable(&pdev->dev);
416 ret = pm_runtime_resume_and_get(&pdev->dev);
418 dev_err(&pdev->dev, "pm_runtime_resume_and_get failed: %d\n", ret);
422 raw_spin_lock_init(&rzg2l_irqc_data->lock);
424 irq_domain = irq_domain_add_hierarchy(parent_domain, 0, IRQC_NUM_IRQ,
425 node, &rzg2l_irqc_domain_ops,
428 dev_err(&pdev->dev, "failed to add irq domain\n");
433 register_syscore_ops(&rzg2l_irqc_syscore_ops);
438 pm_runtime_put(&pdev->dev);
440 pm_runtime_disable(&pdev->dev);
441 reset_control_assert(resetn);
445 IRQCHIP_PLATFORM_DRIVER_BEGIN(rzg2l_irqc)
446 IRQCHIP_MATCH("renesas,rzg2l-irqc", rzg2l_irqc_init)
447 IRQCHIP_PLATFORM_DRIVER_END(rzg2l_irqc)
448 MODULE_AUTHOR("Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>");
449 MODULE_DESCRIPTION("Renesas RZ/G2L IRQC Driver");