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717c3dbc MJ |
1 | /* |
2 | * Copyright (C) 2015 Hisilicon Limited, All Rights Reserved. | |
3 | * Author: Jun Ma <majun258@huawei.com> | |
4 | * Author: Yun Wu <wuyun.wu@huawei.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
17 | */ | |
18 | ||
9650c60e MJ |
19 | #include <linux/interrupt.h> |
20 | #include <linux/irqchip.h> | |
717c3dbc | 21 | #include <linux/module.h> |
9650c60e | 22 | #include <linux/msi.h> |
717c3dbc MJ |
23 | #include <linux/of_address.h> |
24 | #include <linux/of_irq.h> | |
25 | #include <linux/of_platform.h> | |
26 | #include <linux/platform_device.h> | |
27 | #include <linux/slab.h> | |
28 | ||
9650c60e MJ |
29 | /* Interrupt numbers per mbigen node supported */ |
30 | #define IRQS_PER_MBIGEN_NODE 128 | |
31 | ||
32 | /* 64 irqs (Pin0-pin63) are reserved for each mbigen chip */ | |
33 | #define RESERVED_IRQ_PER_MBIGEN_CHIP 64 | |
34 | ||
35 | /* The maximum IRQ pin number of mbigen chip(start from 0) */ | |
36 | #define MAXIMUM_IRQ_PIN_NUM 1407 | |
37 | ||
38 | /** | |
39 | * In mbigen vector register | |
40 | * bit[21:12]: event id value | |
41 | * bit[11:0]: device id | |
42 | */ | |
43 | #define IRQ_EVENT_ID_SHIFT 12 | |
44 | #define IRQ_EVENT_ID_MASK 0x3ff | |
45 | ||
46 | /* register range of each mbigen node */ | |
47 | #define MBIGEN_NODE_OFFSET 0x1000 | |
48 | ||
49 | /* offset of vector register in mbigen node */ | |
50 | #define REG_MBIGEN_VEC_OFFSET 0x200 | |
51 | ||
717c3dbc MJ |
52 | /** |
53 | * struct mbigen_device - holds the information of mbigen device. | |
54 | * | |
55 | * @pdev: pointer to the platform device structure of mbigen chip. | |
56 | * @base: mapped address of this mbigen chip. | |
57 | */ | |
58 | struct mbigen_device { | |
59 | struct platform_device *pdev; | |
60 | void __iomem *base; | |
61 | }; | |
62 | ||
9650c60e MJ |
63 | static inline unsigned int get_mbigen_vec_reg(irq_hw_number_t hwirq) |
64 | { | |
65 | unsigned int nid, pin; | |
66 | ||
67 | hwirq -= RESERVED_IRQ_PER_MBIGEN_CHIP; | |
68 | nid = hwirq / IRQS_PER_MBIGEN_NODE + 1; | |
69 | pin = hwirq % IRQS_PER_MBIGEN_NODE; | |
70 | ||
71 | return pin * 4 + nid * MBIGEN_NODE_OFFSET | |
72 | + REG_MBIGEN_VEC_OFFSET; | |
73 | } | |
74 | ||
75 | static struct irq_chip mbigen_irq_chip = { | |
76 | .name = "mbigen-v2", | |
77 | }; | |
78 | ||
79 | static void mbigen_write_msg(struct msi_desc *desc, struct msi_msg *msg) | |
80 | { | |
81 | struct irq_data *d = irq_get_irq_data(desc->irq); | |
82 | void __iomem *base = d->chip_data; | |
83 | u32 val; | |
84 | ||
85 | base += get_mbigen_vec_reg(d->hwirq); | |
86 | val = readl_relaxed(base); | |
87 | ||
88 | val &= ~(IRQ_EVENT_ID_MASK << IRQ_EVENT_ID_SHIFT); | |
89 | val |= (msg->data << IRQ_EVENT_ID_SHIFT); | |
90 | ||
91 | /* The address of doorbell is encoded in mbigen register by default | |
92 | * So,we don't need to program the doorbell address at here | |
93 | */ | |
94 | writel_relaxed(val, base); | |
95 | } | |
96 | ||
97 | static int mbigen_domain_translate(struct irq_domain *d, | |
98 | struct irq_fwspec *fwspec, | |
99 | unsigned long *hwirq, | |
100 | unsigned int *type) | |
101 | { | |
102 | if (is_of_node(fwspec->fwnode)) { | |
103 | if (fwspec->param_count != 2) | |
104 | return -EINVAL; | |
105 | ||
106 | if ((fwspec->param[0] > MAXIMUM_IRQ_PIN_NUM) || | |
107 | (fwspec->param[0] < RESERVED_IRQ_PER_MBIGEN_CHIP)) | |
108 | return -EINVAL; | |
109 | else | |
110 | *hwirq = fwspec->param[0]; | |
111 | ||
112 | /* If there is no valid irq type, just use the default type */ | |
113 | if ((fwspec->param[1] == IRQ_TYPE_EDGE_RISING) || | |
114 | (fwspec->param[1] == IRQ_TYPE_LEVEL_HIGH)) | |
115 | *type = fwspec->param[1]; | |
116 | else | |
117 | return -EINVAL; | |
118 | ||
119 | return 0; | |
120 | } | |
121 | return -EINVAL; | |
122 | } | |
123 | ||
124 | static int mbigen_irq_domain_alloc(struct irq_domain *domain, | |
125 | unsigned int virq, | |
126 | unsigned int nr_irqs, | |
127 | void *args) | |
128 | { | |
129 | struct irq_fwspec *fwspec = args; | |
130 | irq_hw_number_t hwirq; | |
131 | unsigned int type; | |
132 | struct mbigen_device *mgn_chip; | |
133 | int i, err; | |
134 | ||
135 | err = mbigen_domain_translate(domain, fwspec, &hwirq, &type); | |
136 | if (err) | |
137 | return err; | |
138 | ||
139 | err = platform_msi_domain_alloc(domain, virq, nr_irqs); | |
140 | if (err) | |
141 | return err; | |
142 | ||
143 | mgn_chip = platform_msi_get_host_data(domain); | |
144 | ||
145 | for (i = 0; i < nr_irqs; i++) | |
146 | irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i, | |
147 | &mbigen_irq_chip, mgn_chip->base); | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
152 | static struct irq_domain_ops mbigen_domain_ops = { | |
153 | .translate = mbigen_domain_translate, | |
154 | .alloc = mbigen_irq_domain_alloc, | |
155 | .free = irq_domain_free_irqs_common, | |
156 | }; | |
157 | ||
717c3dbc MJ |
158 | static int mbigen_device_probe(struct platform_device *pdev) |
159 | { | |
160 | struct mbigen_device *mgn_chip; | |
161 | struct resource *res; | |
9650c60e MJ |
162 | struct irq_domain *domain; |
163 | u32 num_pins; | |
717c3dbc MJ |
164 | |
165 | mgn_chip = devm_kzalloc(&pdev->dev, sizeof(*mgn_chip), GFP_KERNEL); | |
166 | if (!mgn_chip) | |
167 | return -ENOMEM; | |
168 | ||
169 | mgn_chip->pdev = pdev; | |
170 | ||
171 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
172 | mgn_chip->base = devm_ioremap_resource(&pdev->dev, res); | |
173 | if (IS_ERR(mgn_chip->base)) | |
174 | return PTR_ERR(mgn_chip->base); | |
175 | ||
9650c60e MJ |
176 | if (of_property_read_u32(pdev->dev.of_node, "num-pins", &num_pins) < 0) { |
177 | dev_err(&pdev->dev, "No num-pins property\n"); | |
178 | return -EINVAL; | |
179 | } | |
180 | ||
181 | domain = platform_msi_create_device_domain(&pdev->dev, num_pins, | |
182 | mbigen_write_msg, | |
183 | &mbigen_domain_ops, | |
184 | mgn_chip); | |
185 | ||
186 | if (!domain) | |
187 | return -ENOMEM; | |
188 | ||
717c3dbc MJ |
189 | platform_set_drvdata(pdev, mgn_chip); |
190 | ||
9650c60e MJ |
191 | dev_info(&pdev->dev, "Allocated %d MSIs\n", num_pins); |
192 | ||
717c3dbc MJ |
193 | return 0; |
194 | } | |
195 | ||
196 | static const struct of_device_id mbigen_of_match[] = { | |
197 | { .compatible = "hisilicon,mbigen-v2" }, | |
198 | { /* END */ } | |
199 | }; | |
200 | MODULE_DEVICE_TABLE(of, mbigen_of_match); | |
201 | ||
202 | static struct platform_driver mbigen_platform_driver = { | |
203 | .driver = { | |
204 | .name = "Hisilicon MBIGEN-V2", | |
205 | .owner = THIS_MODULE, | |
206 | .of_match_table = mbigen_of_match, | |
207 | }, | |
208 | .probe = mbigen_device_probe, | |
209 | }; | |
210 | ||
211 | module_platform_driver(mbigen_platform_driver); | |
212 | ||
213 | MODULE_AUTHOR("Jun Ma <majun258@huawei.com>"); | |
214 | MODULE_AUTHOR("Yun Wu <wuyun.wu@huawei.com>"); | |
215 | MODULE_LICENSE("GPL"); | |
216 | MODULE_DESCRIPTION("Hisilicon MBI Generator driver"); |