Commit | Line | Data |
---|---|---|
8e8e69d6 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
9c384189 LY |
2 | /* |
3 | * Hisilicon's Hi6220 mailbox driver | |
4 | * | |
5 | * Copyright (c) 2015 Hisilicon Limited. | |
6 | * Copyright (c) 2015 Linaro Limited. | |
7 | * | |
8 | * Author: Leo Yan <leo.yan@linaro.org> | |
9c384189 LY |
9 | */ |
10 | ||
11 | #include <linux/device.h> | |
12 | #include <linux/err.h> | |
13 | #include <linux/interrupt.h> | |
14 | #include <linux/io.h> | |
15 | #include <linux/kfifo.h> | |
16 | #include <linux/mailbox_controller.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/slab.h> | |
20 | ||
21 | #define MBOX_CHAN_MAX 32 | |
22 | ||
23 | #define MBOX_TX 0x1 | |
24 | ||
25 | /* Mailbox message length: 8 words */ | |
26 | #define MBOX_MSG_LEN 8 | |
27 | ||
28 | /* Mailbox Registers */ | |
29 | #define MBOX_OFF(m) (0x40 * (m)) | |
30 | #define MBOX_MODE_REG(m) (MBOX_OFF(m) + 0x0) | |
31 | #define MBOX_DATA_REG(m) (MBOX_OFF(m) + 0x4) | |
32 | ||
33 | #define MBOX_STATE_MASK (0xF << 4) | |
34 | #define MBOX_STATE_IDLE (0x1 << 4) | |
35 | #define MBOX_STATE_TX (0x2 << 4) | |
36 | #define MBOX_STATE_RX (0x4 << 4) | |
37 | #define MBOX_STATE_ACK (0x8 << 4) | |
38 | #define MBOX_ACK_CONFIG_MASK (0x1 << 0) | |
39 | #define MBOX_ACK_AUTOMATIC (0x1 << 0) | |
40 | #define MBOX_ACK_IRQ (0x0 << 0) | |
41 | ||
42 | /* IPC registers */ | |
43 | #define ACK_INT_RAW_REG(i) ((i) + 0x400) | |
44 | #define ACK_INT_MSK_REG(i) ((i) + 0x404) | |
45 | #define ACK_INT_STAT_REG(i) ((i) + 0x408) | |
46 | #define ACK_INT_CLR_REG(i) ((i) + 0x40c) | |
47 | #define ACK_INT_ENA_REG(i) ((i) + 0x500) | |
48 | #define ACK_INT_DIS_REG(i) ((i) + 0x504) | |
49 | #define DST_INT_RAW_REG(i) ((i) + 0x420) | |
50 | ||
51 | ||
52 | struct hi6220_mbox_chan { | |
53 | ||
54 | /* | |
55 | * Description for channel's hardware info: | |
56 | * - direction: tx or rx | |
57 | * - dst irq: peer core's irq number | |
58 | * - ack irq: local irq number | |
59 | * - slot number | |
60 | */ | |
61 | unsigned int dir, dst_irq, ack_irq; | |
62 | unsigned int slot; | |
63 | ||
64 | struct hi6220_mbox *parent; | |
65 | }; | |
66 | ||
67 | struct hi6220_mbox { | |
68 | struct device *dev; | |
69 | ||
70 | int irq; | |
71 | ||
72 | /* flag of enabling tx's irq mode */ | |
73 | bool tx_irq_mode; | |
74 | ||
75 | /* region for ipc event */ | |
76 | void __iomem *ipc; | |
77 | ||
78 | /* region for mailbox */ | |
79 | void __iomem *base; | |
80 | ||
81 | unsigned int chan_num; | |
82 | struct hi6220_mbox_chan *mchan; | |
83 | ||
84 | void *irq_map_chan[MBOX_CHAN_MAX]; | |
85 | struct mbox_chan *chan; | |
86 | struct mbox_controller controller; | |
87 | }; | |
88 | ||
89 | static void mbox_set_state(struct hi6220_mbox *mbox, | |
90 | unsigned int slot, u32 val) | |
91 | { | |
92 | u32 status; | |
93 | ||
94 | status = readl(mbox->base + MBOX_MODE_REG(slot)); | |
95 | status = (status & ~MBOX_STATE_MASK) | val; | |
96 | writel(status, mbox->base + MBOX_MODE_REG(slot)); | |
97 | } | |
98 | ||
99 | static void mbox_set_mode(struct hi6220_mbox *mbox, | |
100 | unsigned int slot, u32 val) | |
101 | { | |
102 | u32 mode; | |
103 | ||
104 | mode = readl(mbox->base + MBOX_MODE_REG(slot)); | |
105 | mode = (mode & ~MBOX_ACK_CONFIG_MASK) | val; | |
106 | writel(mode, mbox->base + MBOX_MODE_REG(slot)); | |
107 | } | |
108 | ||
109 | static bool hi6220_mbox_last_tx_done(struct mbox_chan *chan) | |
110 | { | |
111 | struct hi6220_mbox_chan *mchan = chan->con_priv; | |
112 | struct hi6220_mbox *mbox = mchan->parent; | |
113 | u32 state; | |
114 | ||
115 | /* Only set idle state for polling mode */ | |
116 | BUG_ON(mbox->tx_irq_mode); | |
117 | ||
118 | state = readl(mbox->base + MBOX_MODE_REG(mchan->slot)); | |
119 | return ((state & MBOX_STATE_MASK) == MBOX_STATE_IDLE); | |
120 | } | |
121 | ||
122 | static int hi6220_mbox_send_data(struct mbox_chan *chan, void *msg) | |
123 | { | |
124 | struct hi6220_mbox_chan *mchan = chan->con_priv; | |
125 | struct hi6220_mbox *mbox = mchan->parent; | |
126 | unsigned int slot = mchan->slot; | |
127 | u32 *buf = msg; | |
128 | int i; | |
129 | ||
130 | /* indicate as a TX channel */ | |
131 | mchan->dir = MBOX_TX; | |
132 | ||
133 | mbox_set_state(mbox, slot, MBOX_STATE_TX); | |
134 | ||
135 | if (mbox->tx_irq_mode) | |
136 | mbox_set_mode(mbox, slot, MBOX_ACK_IRQ); | |
137 | else | |
138 | mbox_set_mode(mbox, slot, MBOX_ACK_AUTOMATIC); | |
139 | ||
140 | for (i = 0; i < MBOX_MSG_LEN; i++) | |
141 | writel(buf[i], mbox->base + MBOX_DATA_REG(slot) + i * 4); | |
142 | ||
143 | /* trigger remote request */ | |
144 | writel(BIT(mchan->dst_irq), DST_INT_RAW_REG(mbox->ipc)); | |
145 | return 0; | |
146 | } | |
147 | ||
148 | static irqreturn_t hi6220_mbox_interrupt(int irq, void *p) | |
149 | { | |
150 | struct hi6220_mbox *mbox = p; | |
151 | struct hi6220_mbox_chan *mchan; | |
152 | struct mbox_chan *chan; | |
153 | unsigned int state, intr_bit, i; | |
154 | u32 msg[MBOX_MSG_LEN]; | |
155 | ||
156 | state = readl(ACK_INT_STAT_REG(mbox->ipc)); | |
157 | if (!state) { | |
158 | dev_warn(mbox->dev, "%s: spurious interrupt\n", | |
159 | __func__); | |
160 | return IRQ_HANDLED; | |
161 | } | |
162 | ||
163 | while (state) { | |
164 | intr_bit = __ffs(state); | |
165 | state &= (state - 1); | |
166 | ||
167 | chan = mbox->irq_map_chan[intr_bit]; | |
168 | if (!chan) { | |
169 | dev_warn(mbox->dev, "%s: unexpected irq vector %d\n", | |
170 | __func__, intr_bit); | |
171 | continue; | |
172 | } | |
173 | ||
174 | mchan = chan->con_priv; | |
175 | if (mchan->dir == MBOX_TX) | |
176 | mbox_chan_txdone(chan, 0); | |
177 | else { | |
178 | for (i = 0; i < MBOX_MSG_LEN; i++) | |
179 | msg[i] = readl(mbox->base + | |
180 | MBOX_DATA_REG(mchan->slot) + i * 4); | |
181 | ||
182 | mbox_chan_received_data(chan, (void *)msg); | |
183 | } | |
184 | ||
185 | /* clear IRQ source */ | |
186 | writel(BIT(mchan->ack_irq), ACK_INT_CLR_REG(mbox->ipc)); | |
187 | mbox_set_state(mbox, mchan->slot, MBOX_STATE_IDLE); | |
188 | } | |
189 | ||
190 | return IRQ_HANDLED; | |
191 | } | |
192 | ||
193 | static int hi6220_mbox_startup(struct mbox_chan *chan) | |
194 | { | |
195 | struct hi6220_mbox_chan *mchan = chan->con_priv; | |
196 | struct hi6220_mbox *mbox = mchan->parent; | |
197 | ||
198 | mchan->dir = 0; | |
199 | ||
200 | /* enable interrupt */ | |
201 | writel(BIT(mchan->ack_irq), ACK_INT_ENA_REG(mbox->ipc)); | |
202 | return 0; | |
203 | } | |
204 | ||
205 | static void hi6220_mbox_shutdown(struct mbox_chan *chan) | |
206 | { | |
207 | struct hi6220_mbox_chan *mchan = chan->con_priv; | |
208 | struct hi6220_mbox *mbox = mchan->parent; | |
209 | ||
210 | /* disable interrupt */ | |
211 | writel(BIT(mchan->ack_irq), ACK_INT_DIS_REG(mbox->ipc)); | |
212 | mbox->irq_map_chan[mchan->ack_irq] = NULL; | |
213 | } | |
214 | ||
8ce33c6f | 215 | static const struct mbox_chan_ops hi6220_mbox_ops = { |
9c384189 LY |
216 | .send_data = hi6220_mbox_send_data, |
217 | .startup = hi6220_mbox_startup, | |
218 | .shutdown = hi6220_mbox_shutdown, | |
219 | .last_tx_done = hi6220_mbox_last_tx_done, | |
220 | }; | |
221 | ||
222 | static struct mbox_chan *hi6220_mbox_xlate(struct mbox_controller *controller, | |
223 | const struct of_phandle_args *spec) | |
224 | { | |
225 | struct hi6220_mbox *mbox = dev_get_drvdata(controller->dev); | |
226 | struct hi6220_mbox_chan *mchan; | |
227 | struct mbox_chan *chan; | |
228 | unsigned int i = spec->args[0]; | |
229 | unsigned int dst_irq = spec->args[1]; | |
230 | unsigned int ack_irq = spec->args[2]; | |
231 | ||
232 | /* Bounds checking */ | |
233 | if (i >= mbox->chan_num || dst_irq >= mbox->chan_num || | |
234 | ack_irq >= mbox->chan_num) { | |
235 | dev_err(mbox->dev, | |
236 | "Invalid channel idx %d dst_irq %d ack_irq %d\n", | |
237 | i, dst_irq, ack_irq); | |
238 | return ERR_PTR(-EINVAL); | |
239 | } | |
240 | ||
241 | /* Is requested channel free? */ | |
242 | chan = &mbox->chan[i]; | |
243 | if (mbox->irq_map_chan[ack_irq] == (void *)chan) { | |
244 | dev_err(mbox->dev, "Channel in use\n"); | |
245 | return ERR_PTR(-EBUSY); | |
246 | } | |
247 | ||
248 | mchan = chan->con_priv; | |
249 | mchan->dst_irq = dst_irq; | |
250 | mchan->ack_irq = ack_irq; | |
251 | ||
252 | mbox->irq_map_chan[ack_irq] = (void *)chan; | |
253 | return chan; | |
254 | } | |
255 | ||
256 | static const struct of_device_id hi6220_mbox_of_match[] = { | |
257 | { .compatible = "hisilicon,hi6220-mbox", }, | |
258 | {}, | |
259 | }; | |
260 | MODULE_DEVICE_TABLE(of, hi6220_mbox_of_match); | |
261 | ||
262 | static int hi6220_mbox_probe(struct platform_device *pdev) | |
263 | { | |
264 | struct device_node *node = pdev->dev.of_node; | |
265 | struct device *dev = &pdev->dev; | |
266 | struct hi6220_mbox *mbox; | |
267 | struct resource *res; | |
268 | int i, err; | |
269 | ||
270 | mbox = devm_kzalloc(dev, sizeof(*mbox), GFP_KERNEL); | |
271 | if (!mbox) | |
272 | return -ENOMEM; | |
273 | ||
274 | mbox->dev = dev; | |
275 | mbox->chan_num = MBOX_CHAN_MAX; | |
a86854d0 KC |
276 | mbox->mchan = devm_kcalloc(dev, |
277 | mbox->chan_num, sizeof(*mbox->mchan), GFP_KERNEL); | |
9c384189 LY |
278 | if (!mbox->mchan) |
279 | return -ENOMEM; | |
280 | ||
a86854d0 KC |
281 | mbox->chan = devm_kcalloc(dev, |
282 | mbox->chan_num, sizeof(*mbox->chan), GFP_KERNEL); | |
9c384189 LY |
283 | if (!mbox->chan) |
284 | return -ENOMEM; | |
285 | ||
286 | mbox->irq = platform_get_irq(pdev, 0); | |
287 | if (mbox->irq < 0) | |
288 | return mbox->irq; | |
289 | ||
290 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
291 | mbox->ipc = devm_ioremap_resource(dev, res); | |
292 | if (IS_ERR(mbox->ipc)) { | |
293 | dev_err(dev, "ioremap ipc failed\n"); | |
294 | return PTR_ERR(mbox->ipc); | |
295 | } | |
296 | ||
297 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
298 | mbox->base = devm_ioremap_resource(dev, res); | |
299 | if (IS_ERR(mbox->base)) { | |
300 | dev_err(dev, "ioremap buffer failed\n"); | |
301 | return PTR_ERR(mbox->base); | |
302 | } | |
303 | ||
304 | err = devm_request_irq(dev, mbox->irq, hi6220_mbox_interrupt, 0, | |
305 | dev_name(dev), mbox); | |
306 | if (err) { | |
307 | dev_err(dev, "Failed to register a mailbox IRQ handler: %d\n", | |
308 | err); | |
309 | return -ENODEV; | |
310 | } | |
311 | ||
312 | mbox->controller.dev = dev; | |
313 | mbox->controller.chans = &mbox->chan[0]; | |
314 | mbox->controller.num_chans = mbox->chan_num; | |
315 | mbox->controller.ops = &hi6220_mbox_ops; | |
316 | mbox->controller.of_xlate = hi6220_mbox_xlate; | |
317 | ||
318 | for (i = 0; i < mbox->chan_num; i++) { | |
319 | mbox->chan[i].con_priv = &mbox->mchan[i]; | |
320 | mbox->irq_map_chan[i] = NULL; | |
321 | ||
322 | mbox->mchan[i].parent = mbox; | |
323 | mbox->mchan[i].slot = i; | |
324 | } | |
325 | ||
326 | /* mask and clear all interrupt vectors */ | |
327 | writel(0x0, ACK_INT_MSK_REG(mbox->ipc)); | |
328 | writel(~0x0, ACK_INT_CLR_REG(mbox->ipc)); | |
329 | ||
330 | /* use interrupt for tx's ack */ | |
331 | if (of_find_property(node, "hi6220,mbox-tx-noirq", NULL)) | |
332 | mbox->tx_irq_mode = false; | |
333 | else | |
334 | mbox->tx_irq_mode = true; | |
335 | ||
336 | if (mbox->tx_irq_mode) | |
337 | mbox->controller.txdone_irq = true; | |
338 | else { | |
339 | mbox->controller.txdone_poll = true; | |
340 | mbox->controller.txpoll_period = 5; | |
341 | } | |
342 | ||
ad3e7f96 | 343 | err = devm_mbox_controller_register(dev, &mbox->controller); |
9c384189 LY |
344 | if (err) { |
345 | dev_err(dev, "Failed to register mailbox %d\n", err); | |
346 | return err; | |
347 | } | |
348 | ||
349 | platform_set_drvdata(pdev, mbox); | |
350 | dev_info(dev, "Mailbox enabled\n"); | |
351 | return 0; | |
352 | } | |
353 | ||
9c384189 LY |
354 | static struct platform_driver hi6220_mbox_driver = { |
355 | .driver = { | |
356 | .name = "hi6220-mbox", | |
9c384189 LY |
357 | .of_match_table = hi6220_mbox_of_match, |
358 | }, | |
359 | .probe = hi6220_mbox_probe, | |
9c384189 LY |
360 | }; |
361 | ||
362 | static int __init hi6220_mbox_init(void) | |
363 | { | |
364 | return platform_driver_register(&hi6220_mbox_driver); | |
365 | } | |
366 | core_initcall(hi6220_mbox_init); | |
367 | ||
368 | static void __exit hi6220_mbox_exit(void) | |
369 | { | |
370 | platform_driver_unregister(&hi6220_mbox_driver); | |
371 | } | |
372 | module_exit(hi6220_mbox_exit); | |
373 | ||
374 | MODULE_AUTHOR("Leo Yan <leo.yan@linaro.org>"); | |
375 | MODULE_DESCRIPTION("Hi6220 mailbox driver"); | |
376 | MODULE_LICENSE("GPL v2"); |