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0136afa0 LS |
1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* | |
3 | * Copyright 2017 NXP | |
4 | * Copyright (C) 2018 Pengutronix, Lucas Stach <kernel@pengutronix.de> | |
5 | */ | |
6 | ||
7 | #include <linux/clk.h> | |
8 | #include <linux/interrupt.h> | |
9 | #include <linux/irq.h> | |
10 | #include <linux/irqchip/chained_irq.h> | |
11 | #include <linux/irqdomain.h> | |
12 | #include <linux/kernel.h> | |
28528fca | 13 | #include <linux/of_irq.h> |
0136afa0 LS |
14 | #include <linux/of_platform.h> |
15 | #include <linux/spinlock.h> | |
16 | ||
deb904e4 | 17 | #define CTRL_STRIDE_OFF(_t, _r) (_t * 4 * _r) |
0136afa0 LS |
18 | #define CHANCTRL 0x0 |
19 | #define CHANMASK(n, t) (CTRL_STRIDE_OFF(t, 0) + 0x4 * (n) + 0x4) | |
20 | #define CHANSET(n, t) (CTRL_STRIDE_OFF(t, 1) + 0x4 * (n) + 0x4) | |
21 | #define CHANSTATUS(n, t) (CTRL_STRIDE_OFF(t, 2) + 0x4 * (n) + 0x4) | |
22 | #define CHAN_MINTDIS(t) (CTRL_STRIDE_OFF(t, 3) + 0x4) | |
23 | #define CHAN_MASTRSTAT(t) (CTRL_STRIDE_OFF(t, 3) + 0x8) | |
24 | ||
28528fca AD |
25 | #define CHAN_MAX_OUTPUT_INT 0x8 |
26 | ||
0136afa0 LS |
27 | struct irqsteer_data { |
28 | void __iomem *regs; | |
29 | struct clk *ipg_clk; | |
28528fca AD |
30 | int irq[CHAN_MAX_OUTPUT_INT]; |
31 | int irq_count; | |
0136afa0 | 32 | raw_spinlock_t lock; |
deb904e4 | 33 | int reg_num; |
0136afa0 LS |
34 | int channel; |
35 | struct irq_domain *domain; | |
36 | u32 *saved_reg; | |
37 | }; | |
38 | ||
39 | static int imx_irqsteer_get_reg_index(struct irqsteer_data *data, | |
40 | unsigned long irqnum) | |
41 | { | |
deb904e4 | 42 | return (data->reg_num - irqnum / 32 - 1); |
0136afa0 LS |
43 | } |
44 | ||
45 | static void imx_irqsteer_irq_unmask(struct irq_data *d) | |
46 | { | |
47 | struct irqsteer_data *data = d->chip_data; | |
48 | int idx = imx_irqsteer_get_reg_index(data, d->hwirq); | |
49 | unsigned long flags; | |
50 | u32 val; | |
51 | ||
52 | raw_spin_lock_irqsave(&data->lock, flags); | |
deb904e4 | 53 | val = readl_relaxed(data->regs + CHANMASK(idx, data->reg_num)); |
0136afa0 | 54 | val |= BIT(d->hwirq % 32); |
deb904e4 | 55 | writel_relaxed(val, data->regs + CHANMASK(idx, data->reg_num)); |
0136afa0 LS |
56 | raw_spin_unlock_irqrestore(&data->lock, flags); |
57 | } | |
58 | ||
59 | static void imx_irqsteer_irq_mask(struct irq_data *d) | |
60 | { | |
61 | struct irqsteer_data *data = d->chip_data; | |
62 | int idx = imx_irqsteer_get_reg_index(data, d->hwirq); | |
63 | unsigned long flags; | |
64 | u32 val; | |
65 | ||
66 | raw_spin_lock_irqsave(&data->lock, flags); | |
deb904e4 | 67 | val = readl_relaxed(data->regs + CHANMASK(idx, data->reg_num)); |
0136afa0 | 68 | val &= ~BIT(d->hwirq % 32); |
deb904e4 | 69 | writel_relaxed(val, data->regs + CHANMASK(idx, data->reg_num)); |
0136afa0 LS |
70 | raw_spin_unlock_irqrestore(&data->lock, flags); |
71 | } | |
72 | ||
73 | static struct irq_chip imx_irqsteer_irq_chip = { | |
74 | .name = "irqsteer", | |
75 | .irq_mask = imx_irqsteer_irq_mask, | |
76 | .irq_unmask = imx_irqsteer_irq_unmask, | |
77 | }; | |
78 | ||
79 | static int imx_irqsteer_irq_map(struct irq_domain *h, unsigned int irq, | |
80 | irq_hw_number_t hwirq) | |
81 | { | |
82 | irq_set_status_flags(irq, IRQ_LEVEL); | |
83 | irq_set_chip_data(irq, h->host_data); | |
84 | irq_set_chip_and_handler(irq, &imx_irqsteer_irq_chip, handle_level_irq); | |
85 | ||
86 | return 0; | |
87 | } | |
88 | ||
89 | static const struct irq_domain_ops imx_irqsteer_domain_ops = { | |
90 | .map = imx_irqsteer_irq_map, | |
91 | .xlate = irq_domain_xlate_onecell, | |
92 | }; | |
93 | ||
28528fca AD |
94 | static int imx_irqsteer_get_hwirq_base(struct irqsteer_data *data, u32 irq) |
95 | { | |
96 | int i; | |
97 | ||
98 | for (i = 0; i < data->irq_count; i++) { | |
99 | if (data->irq[i] == irq) | |
100 | return i * 64; | |
101 | } | |
102 | ||
103 | return -EINVAL; | |
104 | } | |
105 | ||
0136afa0 LS |
106 | static void imx_irqsteer_irq_handler(struct irq_desc *desc) |
107 | { | |
108 | struct irqsteer_data *data = irq_desc_get_handler_data(desc); | |
28528fca AD |
109 | int hwirq; |
110 | int irq, i; | |
0136afa0 LS |
111 | |
112 | chained_irq_enter(irq_desc_get_chip(desc), desc); | |
113 | ||
28528fca AD |
114 | irq = irq_desc_get_irq(desc); |
115 | hwirq = imx_irqsteer_get_hwirq_base(data, irq); | |
116 | if (hwirq < 0) { | |
117 | pr_warn("%s: unable to get hwirq base for irq %d\n", | |
118 | __func__, irq); | |
119 | return; | |
120 | } | |
121 | ||
122 | for (i = 0; i < 2; i++, hwirq += 32) { | |
123 | int idx = imx_irqsteer_get_reg_index(data, hwirq); | |
0136afa0 LS |
124 | unsigned long irqmap; |
125 | int pos, virq; | |
126 | ||
28528fca AD |
127 | if (hwirq >= data->reg_num * 32) |
128 | break; | |
129 | ||
0136afa0 | 130 | irqmap = readl_relaxed(data->regs + |
deb904e4 | 131 | CHANSTATUS(idx, data->reg_num)); |
0136afa0 LS |
132 | |
133 | for_each_set_bit(pos, &irqmap, 32) { | |
28528fca | 134 | virq = irq_find_mapping(data->domain, pos + hwirq); |
0136afa0 LS |
135 | if (virq) |
136 | generic_handle_irq(virq); | |
137 | } | |
138 | } | |
139 | ||
140 | chained_irq_exit(irq_desc_get_chip(desc), desc); | |
141 | } | |
142 | ||
143 | static int imx_irqsteer_probe(struct platform_device *pdev) | |
144 | { | |
145 | struct device_node *np = pdev->dev.of_node; | |
146 | struct irqsteer_data *data; | |
147 | struct resource *res; | |
28528fca AD |
148 | u32 irqs_num; |
149 | int i, ret; | |
0136afa0 LS |
150 | |
151 | data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); | |
152 | if (!data) | |
153 | return -ENOMEM; | |
154 | ||
155 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
156 | data->regs = devm_ioremap_resource(&pdev->dev, res); | |
157 | if (IS_ERR(data->regs)) { | |
158 | dev_err(&pdev->dev, "failed to initialize reg\n"); | |
159 | return PTR_ERR(data->regs); | |
160 | } | |
161 | ||
0136afa0 LS |
162 | data->ipg_clk = devm_clk_get(&pdev->dev, "ipg"); |
163 | if (IS_ERR(data->ipg_clk)) { | |
164 | ret = PTR_ERR(data->ipg_clk); | |
165 | if (ret != -EPROBE_DEFER) | |
166 | dev_err(&pdev->dev, "failed to get ipg clk: %d\n", ret); | |
167 | return ret; | |
168 | } | |
169 | ||
170 | raw_spin_lock_init(&data->lock); | |
171 | ||
7d3a5eb7 AB |
172 | ret = of_property_read_u32(np, "fsl,num-irqs", &irqs_num); |
173 | if (ret) | |
174 | return ret; | |
175 | ret = of_property_read_u32(np, "fsl,channel", &data->channel); | |
176 | if (ret) | |
177 | return ret; | |
0136afa0 | 178 | |
28528fca AD |
179 | /* |
180 | * There is one output irq for each group of 64 inputs. | |
181 | * One register bit map can represent 32 input interrupts. | |
182 | */ | |
183 | data->irq_count = DIV_ROUND_UP(irqs_num, 64); | |
184 | data->reg_num = irqs_num / 32; | |
deb904e4 | 185 | |
0136afa0 LS |
186 | if (IS_ENABLED(CONFIG_PM_SLEEP)) { |
187 | data->saved_reg = devm_kzalloc(&pdev->dev, | |
deb904e4 | 188 | sizeof(u32) * data->reg_num, |
0136afa0 LS |
189 | GFP_KERNEL); |
190 | if (!data->saved_reg) | |
191 | return -ENOMEM; | |
192 | } | |
193 | ||
194 | ret = clk_prepare_enable(data->ipg_clk); | |
195 | if (ret) { | |
196 | dev_err(&pdev->dev, "failed to enable ipg clk: %d\n", ret); | |
197 | return ret; | |
198 | } | |
199 | ||
200 | /* steer all IRQs into configured channel */ | |
201 | writel_relaxed(BIT(data->channel), data->regs + CHANCTRL); | |
202 | ||
deb904e4 | 203 | data->domain = irq_domain_add_linear(np, data->reg_num * 32, |
0136afa0 LS |
204 | &imx_irqsteer_domain_ops, data); |
205 | if (!data->domain) { | |
206 | dev_err(&pdev->dev, "failed to create IRQ domain\n"); | |
28528fca AD |
207 | ret = -ENOMEM; |
208 | goto out; | |
0136afa0 LS |
209 | } |
210 | ||
28528fca AD |
211 | if (!data->irq_count || data->irq_count > CHAN_MAX_OUTPUT_INT) { |
212 | ret = -EINVAL; | |
213 | goto out; | |
214 | } | |
215 | ||
216 | for (i = 0; i < data->irq_count; i++) { | |
217 | data->irq[i] = irq_of_parse_and_map(np, i); | |
218 | if (!data->irq[i]) { | |
219 | ret = -EINVAL; | |
220 | goto out; | |
221 | } | |
222 | ||
223 | irq_set_chained_handler_and_data(data->irq[i], | |
224 | imx_irqsteer_irq_handler, | |
225 | data); | |
226 | } | |
0136afa0 LS |
227 | |
228 | platform_set_drvdata(pdev, data); | |
229 | ||
230 | return 0; | |
28528fca AD |
231 | out: |
232 | clk_disable_unprepare(data->ipg_clk); | |
233 | return ret; | |
0136afa0 LS |
234 | } |
235 | ||
236 | static int imx_irqsteer_remove(struct platform_device *pdev) | |
237 | { | |
238 | struct irqsteer_data *irqsteer_data = platform_get_drvdata(pdev); | |
28528fca AD |
239 | int i; |
240 | ||
241 | for (i = 0; i < irqsteer_data->irq_count; i++) | |
242 | irq_set_chained_handler_and_data(irqsteer_data->irq[i], | |
243 | NULL, NULL); | |
0136afa0 | 244 | |
0136afa0 LS |
245 | irq_domain_remove(irqsteer_data->domain); |
246 | ||
247 | clk_disable_unprepare(irqsteer_data->ipg_clk); | |
248 | ||
249 | return 0; | |
250 | } | |
251 | ||
252 | #ifdef CONFIG_PM_SLEEP | |
253 | static void imx_irqsteer_save_regs(struct irqsteer_data *data) | |
254 | { | |
255 | int i; | |
256 | ||
deb904e4 | 257 | for (i = 0; i < data->reg_num; i++) |
0136afa0 | 258 | data->saved_reg[i] = readl_relaxed(data->regs + |
deb904e4 | 259 | CHANMASK(i, data->reg_num)); |
0136afa0 LS |
260 | } |
261 | ||
262 | static void imx_irqsteer_restore_regs(struct irqsteer_data *data) | |
263 | { | |
264 | int i; | |
265 | ||
266 | writel_relaxed(BIT(data->channel), data->regs + CHANCTRL); | |
deb904e4 | 267 | for (i = 0; i < data->reg_num; i++) |
0136afa0 | 268 | writel_relaxed(data->saved_reg[i], |
deb904e4 | 269 | data->regs + CHANMASK(i, data->reg_num)); |
0136afa0 LS |
270 | } |
271 | ||
272 | static int imx_irqsteer_suspend(struct device *dev) | |
273 | { | |
274 | struct irqsteer_data *irqsteer_data = dev_get_drvdata(dev); | |
275 | ||
276 | imx_irqsteer_save_regs(irqsteer_data); | |
277 | clk_disable_unprepare(irqsteer_data->ipg_clk); | |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
282 | static int imx_irqsteer_resume(struct device *dev) | |
283 | { | |
284 | struct irqsteer_data *irqsteer_data = dev_get_drvdata(dev); | |
285 | int ret; | |
286 | ||
287 | ret = clk_prepare_enable(irqsteer_data->ipg_clk); | |
288 | if (ret) { | |
289 | dev_err(dev, "failed to enable ipg clk: %d\n", ret); | |
290 | return ret; | |
291 | } | |
292 | imx_irqsteer_restore_regs(irqsteer_data); | |
293 | ||
294 | return 0; | |
295 | } | |
296 | #endif | |
297 | ||
298 | static const struct dev_pm_ops imx_irqsteer_pm_ops = { | |
299 | SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(imx_irqsteer_suspend, imx_irqsteer_resume) | |
300 | }; | |
301 | ||
302 | static const struct of_device_id imx_irqsteer_dt_ids[] = { | |
303 | { .compatible = "fsl,imx-irqsteer", }, | |
304 | {}, | |
305 | }; | |
306 | ||
307 | static struct platform_driver imx_irqsteer_driver = { | |
308 | .driver = { | |
309 | .name = "imx-irqsteer", | |
310 | .of_match_table = imx_irqsteer_dt_ids, | |
311 | .pm = &imx_irqsteer_pm_ops, | |
312 | }, | |
313 | .probe = imx_irqsteer_probe, | |
314 | .remove = imx_irqsteer_remove, | |
315 | }; | |
316 | builtin_platform_driver(imx_irqsteer_driver); |