1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2015 Hisilicon Limited, All Rights Reserved.
4 * Author: Jun Ma <majun258@huawei.com>
5 * Author: Yun Wu <wuyun.wu@huawei.com>
8 #include <linux/acpi.h>
9 #include <linux/interrupt.h>
10 #include <linux/irqchip.h>
11 #include <linux/module.h>
12 #include <linux/msi.h>
13 #include <linux/of_address.h>
14 #include <linux/of_irq.h>
15 #include <linux/of_platform.h>
16 #include <linux/platform_device.h>
17 #include <linux/slab.h>
19 /* Interrupt numbers per mbigen node supported */
20 #define IRQS_PER_MBIGEN_NODE 128
22 /* 64 irqs (Pin0-pin63) are reserved for each mbigen chip */
23 #define RESERVED_IRQ_PER_MBIGEN_CHIP 64
25 /* The maximum IRQ pin number of mbigen chip(start from 0) */
26 #define MAXIMUM_IRQ_PIN_NUM 1407
29 * In mbigen vector register
30 * bit[21:12]: event id value
31 * bit[11:0]: device id
33 #define IRQ_EVENT_ID_SHIFT 12
34 #define IRQ_EVENT_ID_MASK 0x3ff
36 /* register range of each mbigen node */
37 #define MBIGEN_NODE_OFFSET 0x1000
39 /* offset of vector register in mbigen node */
40 #define REG_MBIGEN_VEC_OFFSET 0x200
43 * offset of clear register in mbigen node
44 * This register is used to clear the status
47 #define REG_MBIGEN_CLEAR_OFFSET 0xa000
50 * offset of interrupt type register
51 * This register is used to configure interrupt
54 #define REG_MBIGEN_TYPE_OFFSET 0x0
57 * struct mbigen_device - holds the information of mbigen device.
59 * @pdev: pointer to the platform device structure of mbigen chip.
60 * @base: mapped address of this mbigen chip.
62 struct mbigen_device {
63 struct platform_device *pdev;
67 static inline unsigned int get_mbigen_vec_reg(irq_hw_number_t hwirq)
69 unsigned int nid, pin;
71 hwirq -= RESERVED_IRQ_PER_MBIGEN_CHIP;
72 nid = hwirq / IRQS_PER_MBIGEN_NODE + 1;
73 pin = hwirq % IRQS_PER_MBIGEN_NODE;
75 return pin * 4 + nid * MBIGEN_NODE_OFFSET
76 + REG_MBIGEN_VEC_OFFSET;
79 static inline void get_mbigen_type_reg(irq_hw_number_t hwirq,
82 unsigned int nid, irq_ofst, ofst;
84 hwirq -= RESERVED_IRQ_PER_MBIGEN_CHIP;
85 nid = hwirq / IRQS_PER_MBIGEN_NODE + 1;
86 irq_ofst = hwirq % IRQS_PER_MBIGEN_NODE;
88 *mask = 1 << (irq_ofst % 32);
89 ofst = irq_ofst / 32 * 4;
91 *addr = ofst + nid * MBIGEN_NODE_OFFSET
92 + REG_MBIGEN_TYPE_OFFSET;
95 static inline void get_mbigen_clear_reg(irq_hw_number_t hwirq,
98 unsigned int ofst = (hwirq / 32) * 4;
100 *mask = 1 << (hwirq % 32);
101 *addr = ofst + REG_MBIGEN_CLEAR_OFFSET;
104 static void mbigen_eoi_irq(struct irq_data *data)
106 void __iomem *base = data->chip_data;
109 get_mbigen_clear_reg(data->hwirq, &mask, &addr);
111 writel_relaxed(mask, base + addr);
113 irq_chip_eoi_parent(data);
116 static int mbigen_set_type(struct irq_data *data, unsigned int type)
118 void __iomem *base = data->chip_data;
121 if (type != IRQ_TYPE_LEVEL_HIGH && type != IRQ_TYPE_EDGE_RISING)
124 get_mbigen_type_reg(data->hwirq, &mask, &addr);
126 val = readl_relaxed(base + addr);
128 if (type == IRQ_TYPE_LEVEL_HIGH)
133 writel_relaxed(val, base + addr);
138 static struct irq_chip mbigen_irq_chip = {
140 .irq_mask = irq_chip_mask_parent,
141 .irq_unmask = irq_chip_unmask_parent,
142 .irq_eoi = mbigen_eoi_irq,
143 .irq_set_type = mbigen_set_type,
144 .irq_set_affinity = irq_chip_set_affinity_parent,
147 static void mbigen_write_msg(struct msi_desc *desc, struct msi_msg *msg)
149 struct irq_data *d = irq_get_irq_data(desc->irq);
150 void __iomem *base = d->chip_data;
153 if (!msg->address_lo && !msg->address_hi)
156 base += get_mbigen_vec_reg(d->hwirq);
157 val = readl_relaxed(base);
159 val &= ~(IRQ_EVENT_ID_MASK << IRQ_EVENT_ID_SHIFT);
160 val |= (msg->data << IRQ_EVENT_ID_SHIFT);
162 /* The address of doorbell is encoded in mbigen register by default
163 * So,we don't need to program the doorbell address at here
165 writel_relaxed(val, base);
168 static int mbigen_domain_translate(struct irq_domain *d,
169 struct irq_fwspec *fwspec,
170 unsigned long *hwirq,
173 if (is_of_node(fwspec->fwnode) || is_acpi_device_node(fwspec->fwnode)) {
174 if (fwspec->param_count != 2)
177 if ((fwspec->param[0] > MAXIMUM_IRQ_PIN_NUM) ||
178 (fwspec->param[0] < RESERVED_IRQ_PER_MBIGEN_CHIP))
181 *hwirq = fwspec->param[0];
183 /* If there is no valid irq type, just use the default type */
184 if ((fwspec->param[1] == IRQ_TYPE_EDGE_RISING) ||
185 (fwspec->param[1] == IRQ_TYPE_LEVEL_HIGH))
186 *type = fwspec->param[1];
195 static int mbigen_irq_domain_alloc(struct irq_domain *domain,
197 unsigned int nr_irqs,
200 struct irq_fwspec *fwspec = args;
201 irq_hw_number_t hwirq;
203 struct mbigen_device *mgn_chip;
206 err = mbigen_domain_translate(domain, fwspec, &hwirq, &type);
210 err = platform_msi_domain_alloc(domain, virq, nr_irqs);
214 mgn_chip = platform_msi_get_host_data(domain);
216 for (i = 0; i < nr_irqs; i++)
217 irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
218 &mbigen_irq_chip, mgn_chip->base);
223 static const struct irq_domain_ops mbigen_domain_ops = {
224 .translate = mbigen_domain_translate,
225 .alloc = mbigen_irq_domain_alloc,
226 .free = irq_domain_free_irqs_common,
229 static int mbigen_of_create_domain(struct platform_device *pdev,
230 struct mbigen_device *mgn_chip)
232 struct device *parent;
233 struct platform_device *child;
234 struct irq_domain *domain;
235 struct device_node *np;
238 for_each_child_of_node(pdev->dev.of_node, np) {
239 if (!of_property_read_bool(np, "interrupt-controller"))
242 parent = platform_bus_type.dev_root;
243 child = of_platform_device_create(np, NULL, parent);
249 if (of_property_read_u32(child->dev.of_node, "num-pins",
251 dev_err(&pdev->dev, "No num-pins property\n");
256 domain = platform_msi_create_device_domain(&child->dev, num_pins,
270 static int mbigen_acpi_create_domain(struct platform_device *pdev,
271 struct mbigen_device *mgn_chip)
273 struct irq_domain *domain;
278 * "num-pins" is the total number of interrupt pins implemented in
279 * this mbigen instance, and mbigen is an interrupt controller
280 * connected to ITS converting wired interrupts into MSI, so we
281 * use "num-pins" to alloc MSI vectors which are needed by client
282 * devices connected to it.
284 * Here is the DSDT device node used for mbigen in firmware:
286 * Name(_HID, "HISI0152")
288 * Name(_CRS, ResourceTemplate() {
289 * Memory32Fixed(ReadWrite, 0xa0080000, 0x10000)
292 * Name(_DSD, Package () {
293 * ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
295 * Package () {"num-pins", 378}
300 ret = device_property_read_u32(&pdev->dev, "num-pins", &num_pins);
301 if (ret || num_pins == 0)
304 domain = platform_msi_create_device_domain(&pdev->dev, num_pins,
314 static inline int mbigen_acpi_create_domain(struct platform_device *pdev,
315 struct mbigen_device *mgn_chip)
321 static int mbigen_device_probe(struct platform_device *pdev)
323 struct mbigen_device *mgn_chip;
324 struct resource *res;
327 mgn_chip = devm_kzalloc(&pdev->dev, sizeof(*mgn_chip), GFP_KERNEL);
331 mgn_chip->pdev = pdev;
333 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
337 mgn_chip->base = devm_ioremap(&pdev->dev, res->start,
339 if (!mgn_chip->base) {
340 dev_err(&pdev->dev, "failed to ioremap %pR\n", res);
344 if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node)
345 err = mbigen_of_create_domain(pdev, mgn_chip);
346 else if (ACPI_COMPANION(&pdev->dev))
347 err = mbigen_acpi_create_domain(pdev, mgn_chip);
352 dev_err(&pdev->dev, "Failed to create mbi-gen irqdomain\n");
356 platform_set_drvdata(pdev, mgn_chip);
360 static const struct of_device_id mbigen_of_match[] = {
361 { .compatible = "hisilicon,mbigen-v2" },
364 MODULE_DEVICE_TABLE(of, mbigen_of_match);
366 static const struct acpi_device_id mbigen_acpi_match[] = {
370 MODULE_DEVICE_TABLE(acpi, mbigen_acpi_match);
372 static struct platform_driver mbigen_platform_driver = {
374 .name = "Hisilicon MBIGEN-V2",
375 .of_match_table = mbigen_of_match,
376 .acpi_match_table = ACPI_PTR(mbigen_acpi_match),
377 .suppress_bind_attrs = true,
379 .probe = mbigen_device_probe,
382 module_platform_driver(mbigen_platform_driver);
384 MODULE_AUTHOR("Jun Ma <majun258@huawei.com>");
385 MODULE_AUTHOR("Yun Wu <wuyun.wu@huawei.com>");
386 MODULE_LICENSE("GPL");
387 MODULE_DESCRIPTION("Hisilicon MBI Generator driver");