2 * Copyright (C) 2017 Marvell
4 * Hanna Hawa <hannah@marvell.com>
5 * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
7 * This file is licensed under the terms of the GNU General Public
8 * License version 2. This program is licensed "as is" without any
9 * warranty of any kind, whether express or implied.
12 #include <linux/interrupt.h>
13 #include <linux/irq.h>
14 #include <linux/irqchip.h>
15 #include <linux/irqdomain.h>
16 #include <linux/jump_label.h>
17 #include <linux/kernel.h>
18 #include <linux/msi.h>
19 #include <linux/of_irq.h>
20 #include <linux/of_platform.h>
21 #include <linux/platform_device.h>
23 #include <dt-bindings/interrupt-controller/mvebu-icu.h>
26 #define ICU_SETSPI_NSR_AL 0x10
27 #define ICU_SETSPI_NSR_AH 0x14
28 #define ICU_CLRSPI_NSR_AL 0x18
29 #define ICU_CLRSPI_NSR_AH 0x1c
30 #define ICU_SET_SEI_AL 0x50
31 #define ICU_SET_SEI_AH 0x54
32 #define ICU_CLR_SEI_AL 0x58
33 #define ICU_CLR_SEI_AH 0x5C
34 #define ICU_INT_CFG(x) (0x100 + 4 * (x))
35 #define ICU_INT_ENABLE BIT(24)
36 #define ICU_IS_EDGE BIT(28)
37 #define ICU_GROUP_SHIFT 29
40 #define ICU_MAX_IRQS 207
41 #define ICU_SATA0_ICU_ID 109
42 #define ICU_SATA1_ICU_ID 107
44 struct mvebu_icu_subset_data {
45 unsigned int icu_group;
46 unsigned int offset_set_ah;
47 unsigned int offset_set_al;
48 unsigned int offset_clr_ah;
49 unsigned int offset_clr_al;
57 struct mvebu_icu_msi_data {
58 struct mvebu_icu *icu;
60 const struct mvebu_icu_subset_data *subset_data;
63 struct mvebu_icu_irq_data {
64 struct mvebu_icu *icu;
65 unsigned int icu_group;
69 static DEFINE_STATIC_KEY_FALSE(legacy_bindings);
71 static void mvebu_icu_init(struct mvebu_icu *icu,
72 struct mvebu_icu_msi_data *msi_data,
75 const struct mvebu_icu_subset_data *subset = msi_data->subset_data;
77 if (atomic_cmpxchg(&msi_data->initialized, false, true))
80 /* Set 'SET' ICU SPI message address in AP */
81 writel_relaxed(msg[0].address_hi, icu->base + subset->offset_set_ah);
82 writel_relaxed(msg[0].address_lo, icu->base + subset->offset_set_al);
84 if (subset->icu_group != ICU_GRP_NSR)
87 /* Set 'CLEAR' ICU SPI message address in AP (level-MSI only) */
88 writel_relaxed(msg[1].address_hi, icu->base + subset->offset_clr_ah);
89 writel_relaxed(msg[1].address_lo, icu->base + subset->offset_clr_al);
92 static void mvebu_icu_write_msg(struct msi_desc *desc, struct msi_msg *msg)
94 struct irq_data *d = irq_get_irq_data(desc->irq);
95 struct mvebu_icu_msi_data *msi_data = platform_msi_get_host_data(d->domain);
96 struct mvebu_icu_irq_data *icu_irqd = d->chip_data;
97 struct mvebu_icu *icu = icu_irqd->icu;
100 if (msg->address_lo || msg->address_hi) {
101 /* One off initialization per domain */
102 mvebu_icu_init(icu, msi_data, msg);
103 /* Configure the ICU with irq number & type */
104 icu_int = msg->data | ICU_INT_ENABLE;
105 if (icu_irqd->type & IRQ_TYPE_EDGE_RISING)
106 icu_int |= ICU_IS_EDGE;
107 icu_int |= icu_irqd->icu_group << ICU_GROUP_SHIFT;
109 /* De-configure the ICU */
113 writel_relaxed(icu_int, icu->base + ICU_INT_CFG(d->hwirq));
116 * The SATA unit has 2 ports, and a dedicated ICU entry per
117 * port. The ahci sata driver supports only one irq interrupt
118 * per SATA unit. To solve this conflict, we configure the 2
119 * SATA wired interrupts in the south bridge into 1 GIC
120 * interrupt in the north bridge. Even if only a single port
121 * is enabled, if sata node is enabled, both interrupts are
122 * configured (regardless of which port is actually in use).
124 if (d->hwirq == ICU_SATA0_ICU_ID || d->hwirq == ICU_SATA1_ICU_ID) {
125 writel_relaxed(icu_int,
126 icu->base + ICU_INT_CFG(ICU_SATA0_ICU_ID));
127 writel_relaxed(icu_int,
128 icu->base + ICU_INT_CFG(ICU_SATA1_ICU_ID));
132 static struct irq_chip mvebu_icu_nsr_chip = {
134 .irq_mask = irq_chip_mask_parent,
135 .irq_unmask = irq_chip_unmask_parent,
136 .irq_eoi = irq_chip_eoi_parent,
137 .irq_set_type = irq_chip_set_type_parent,
138 .irq_set_affinity = irq_chip_set_affinity_parent,
141 static struct irq_chip mvebu_icu_sei_chip = {
143 .irq_ack = irq_chip_ack_parent,
144 .irq_mask = irq_chip_mask_parent,
145 .irq_unmask = irq_chip_unmask_parent,
146 .irq_set_type = irq_chip_set_type_parent,
147 .irq_set_affinity = irq_chip_set_affinity_parent,
151 mvebu_icu_irq_domain_translate(struct irq_domain *d, struct irq_fwspec *fwspec,
152 unsigned long *hwirq, unsigned int *type)
154 unsigned int param_count = static_branch_unlikely(&legacy_bindings) ? 3 : 2;
155 struct mvebu_icu_msi_data *msi_data = platform_msi_get_host_data(d);
156 struct mvebu_icu *icu = msi_data->icu;
158 /* Check the count of the parameters in dt */
159 if (WARN_ON(fwspec->param_count != param_count)) {
160 dev_err(icu->dev, "wrong ICU parameter count %d\n",
161 fwspec->param_count);
165 if (static_branch_unlikely(&legacy_bindings)) {
166 *hwirq = fwspec->param[1];
167 *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
168 if (fwspec->param[0] != ICU_GRP_NSR) {
169 dev_err(icu->dev, "wrong ICU group type %x\n",
174 *hwirq = fwspec->param[0];
175 *type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
178 * The ICU receives level interrupts. While the NSR are also
179 * level interrupts, SEI are edge interrupts. Force the type
180 * here in this case. Please note that this makes the interrupt
181 * handling unreliable.
183 if (msi_data->subset_data->icu_group == ICU_GRP_SEI)
184 *type = IRQ_TYPE_EDGE_RISING;
187 if (*hwirq >= ICU_MAX_IRQS) {
188 dev_err(icu->dev, "invalid interrupt number %ld\n", *hwirq);
196 mvebu_icu_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
197 unsigned int nr_irqs, void *args)
201 struct irq_fwspec *fwspec = args;
202 struct mvebu_icu_msi_data *msi_data = platform_msi_get_host_data(domain);
203 struct mvebu_icu *icu = msi_data->icu;
204 struct mvebu_icu_irq_data *icu_irqd;
205 struct irq_chip *chip = &mvebu_icu_nsr_chip;
207 icu_irqd = kmalloc(sizeof(*icu_irqd), GFP_KERNEL);
211 err = mvebu_icu_irq_domain_translate(domain, fwspec, &hwirq,
214 dev_err(icu->dev, "failed to translate ICU parameters\n");
218 if (static_branch_unlikely(&legacy_bindings))
219 icu_irqd->icu_group = fwspec->param[0];
221 icu_irqd->icu_group = msi_data->subset_data->icu_group;
224 err = platform_msi_device_domain_alloc(domain, virq, nr_irqs);
226 dev_err(icu->dev, "failed to allocate ICU interrupt in parent domain\n");
230 /* Make sure there is no interrupt left pending by the firmware */
231 err = irq_set_irqchip_state(virq, IRQCHIP_STATE_PENDING, false);
235 if (icu_irqd->icu_group == ICU_GRP_SEI)
236 chip = &mvebu_icu_sei_chip;
238 err = irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
241 dev_err(icu->dev, "failed to set the data to IRQ domain\n");
248 platform_msi_device_domain_free(domain, virq, nr_irqs);
255 mvebu_icu_irq_domain_free(struct irq_domain *domain, unsigned int virq,
256 unsigned int nr_irqs)
258 struct irq_data *d = irq_get_irq_data(virq);
259 struct mvebu_icu_irq_data *icu_irqd = d->chip_data;
263 platform_msi_device_domain_free(domain, virq, nr_irqs);
266 static const struct irq_domain_ops mvebu_icu_domain_ops = {
267 .translate = mvebu_icu_irq_domain_translate,
268 .alloc = mvebu_icu_irq_domain_alloc,
269 .free = mvebu_icu_irq_domain_free,
272 static const struct mvebu_icu_subset_data mvebu_icu_nsr_subset_data = {
273 .icu_group = ICU_GRP_NSR,
274 .offset_set_ah = ICU_SETSPI_NSR_AH,
275 .offset_set_al = ICU_SETSPI_NSR_AL,
276 .offset_clr_ah = ICU_CLRSPI_NSR_AH,
277 .offset_clr_al = ICU_CLRSPI_NSR_AL,
280 static const struct mvebu_icu_subset_data mvebu_icu_sei_subset_data = {
281 .icu_group = ICU_GRP_SEI,
282 .offset_set_ah = ICU_SET_SEI_AH,
283 .offset_set_al = ICU_SET_SEI_AL,
286 static const struct of_device_id mvebu_icu_subset_of_match[] = {
288 .compatible = "marvell,cp110-icu-nsr",
289 .data = &mvebu_icu_nsr_subset_data,
292 .compatible = "marvell,cp110-icu-sei",
293 .data = &mvebu_icu_sei_subset_data,
298 static int mvebu_icu_subset_probe(struct platform_device *pdev)
300 struct mvebu_icu_msi_data *msi_data;
301 struct device_node *msi_parent_dn;
302 struct device *dev = &pdev->dev;
303 struct irq_domain *irq_domain;
305 msi_data = devm_kzalloc(dev, sizeof(*msi_data), GFP_KERNEL);
309 if (static_branch_unlikely(&legacy_bindings)) {
310 msi_data->icu = dev_get_drvdata(dev);
311 msi_data->subset_data = &mvebu_icu_nsr_subset_data;
313 msi_data->icu = dev_get_drvdata(dev->parent);
314 msi_data->subset_data = of_device_get_match_data(dev);
317 dev->msi.domain = of_msi_get_domain(dev, dev->of_node,
318 DOMAIN_BUS_PLATFORM_MSI);
319 if (!dev->msi.domain)
320 return -EPROBE_DEFER;
322 msi_parent_dn = irq_domain_get_of_node(dev->msi.domain);
326 irq_domain = platform_msi_create_device_tree_domain(dev, ICU_MAX_IRQS,
328 &mvebu_icu_domain_ops,
331 dev_err(dev, "Failed to create ICU MSI domain\n");
338 static struct platform_driver mvebu_icu_subset_driver = {
339 .probe = mvebu_icu_subset_probe,
341 .name = "mvebu-icu-subset",
342 .of_match_table = mvebu_icu_subset_of_match,
345 builtin_platform_driver(mvebu_icu_subset_driver);
347 static int mvebu_icu_probe(struct platform_device *pdev)
349 struct mvebu_icu *icu;
352 icu = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_icu),
357 icu->dev = &pdev->dev;
359 icu->base = devm_platform_ioremap_resource(pdev, 0);
360 if (IS_ERR(icu->base))
361 return PTR_ERR(icu->base);
364 * Legacy bindings: ICU is one node with one MSI parent: force manually
365 * the probe of the NSR interrupts side.
366 * New bindings: ICU node has children, one per interrupt controller
367 * having its own MSI parent: call platform_populate().
368 * All ICU instances should use the same bindings.
370 if (!of_get_child_count(pdev->dev.of_node))
371 static_branch_enable(&legacy_bindings);
374 * Clean all ICU interrupts of type NSR and SEI, required to
375 * avoid unpredictable SPI assignments done by firmware.
377 for (i = 0 ; i < ICU_MAX_IRQS ; i++) {
378 u32 icu_int, icu_grp;
380 icu_int = readl_relaxed(icu->base + ICU_INT_CFG(i));
381 icu_grp = icu_int >> ICU_GROUP_SHIFT;
383 if (icu_grp == ICU_GRP_NSR ||
384 (icu_grp == ICU_GRP_SEI &&
385 !static_branch_unlikely(&legacy_bindings)))
386 writel_relaxed(0x0, icu->base + ICU_INT_CFG(i));
389 platform_set_drvdata(pdev, icu);
391 if (static_branch_unlikely(&legacy_bindings))
392 return mvebu_icu_subset_probe(pdev);
394 return devm_of_platform_populate(&pdev->dev);
397 static const struct of_device_id mvebu_icu_of_match[] = {
398 { .compatible = "marvell,cp110-icu", },
402 static struct platform_driver mvebu_icu_driver = {
403 .probe = mvebu_icu_probe,
406 .of_match_table = mvebu_icu_of_match,
409 builtin_platform_driver(mvebu_icu_driver);