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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright Altera Corporation (C) 2013-2014. All rights reserved
4 */
5
6#include <linux/device.h>
7#include <linux/interrupt.h>
8#include <linux/io.h>
9#include <linux/kernel.h>
10#include <linux/mailbox_controller.h>
11#include <linux/module.h>
12#include <linux/of.h>
13#include <linux/platform_device.h>
14
15#define DRIVER_NAME "altera-mailbox"
16
17#define MAILBOX_CMD_REG 0x00
18#define MAILBOX_PTR_REG 0x04
19#define MAILBOX_STS_REG 0x08
20#define MAILBOX_INTMASK_REG 0x0C
21
22#define INT_PENDING_MSK 0x1
23#define INT_SPACE_MSK 0x2
24
25#define STS_PENDING_MSK 0x1
26#define STS_FULL_MSK 0x2
27#define STS_FULL_OFT 0x1
28
29#define MBOX_PENDING(status) (((status) & STS_PENDING_MSK))
30#define MBOX_FULL(status) (((status) & STS_FULL_MSK) >> STS_FULL_OFT)
31
32enum altera_mbox_msg {
33 MBOX_CMD = 0,
34 MBOX_PTR,
35};
36
37#define MBOX_POLLING_MS 5 /* polling interval 5ms */
38
39struct altera_mbox {
40 bool is_sender; /* 1-sender, 0-receiver */
41 bool intr_mode;
42 int irq;
43 void __iomem *mbox_base;
44 struct device *dev;
45 struct mbox_controller controller;
46
47 /* If the controller supports only RX polling mode */
48 struct timer_list rxpoll_timer;
49 struct mbox_chan *chan;
50};
51
52static struct altera_mbox *mbox_chan_to_altera_mbox(struct mbox_chan *chan)
53{
54 if (!chan || !chan->con_priv)
55 return NULL;
56
57 return (struct altera_mbox *)chan->con_priv;
58}
59
60static inline int altera_mbox_full(struct altera_mbox *mbox)
61{
62 u32 status;
63
64 status = readl_relaxed(mbox->mbox_base + MAILBOX_STS_REG);
65 return MBOX_FULL(status);
66}
67
68static inline int altera_mbox_pending(struct altera_mbox *mbox)
69{
70 u32 status;
71
72 status = readl_relaxed(mbox->mbox_base + MAILBOX_STS_REG);
73 return MBOX_PENDING(status);
74}
75
76static void altera_mbox_rx_intmask(struct altera_mbox *mbox, bool enable)
77{
78 u32 mask;
79
80 mask = readl_relaxed(mbox->mbox_base + MAILBOX_INTMASK_REG);
81 if (enable)
82 mask |= INT_PENDING_MSK;
83 else
84 mask &= ~INT_PENDING_MSK;
85 writel_relaxed(mask, mbox->mbox_base + MAILBOX_INTMASK_REG);
86}
87
88static void altera_mbox_tx_intmask(struct altera_mbox *mbox, bool enable)
89{
90 u32 mask;
91
92 mask = readl_relaxed(mbox->mbox_base + MAILBOX_INTMASK_REG);
93 if (enable)
94 mask |= INT_SPACE_MSK;
95 else
96 mask &= ~INT_SPACE_MSK;
97 writel_relaxed(mask, mbox->mbox_base + MAILBOX_INTMASK_REG);
98}
99
100static bool altera_mbox_is_sender(struct altera_mbox *mbox)
101{
102 u32 reg;
103 /* Write a magic number to PTR register and read back this register.
104 * This register is read-write if it is a sender.
105 */
106 #define MBOX_MAGIC 0xA5A5AA55
107 writel_relaxed(MBOX_MAGIC, mbox->mbox_base + MAILBOX_PTR_REG);
108 reg = readl_relaxed(mbox->mbox_base + MAILBOX_PTR_REG);
109 if (reg == MBOX_MAGIC) {
110 /* Clear to 0 */
111 writel_relaxed(0, mbox->mbox_base + MAILBOX_PTR_REG);
112 return true;
113 }
114 return false;
115}
116
117static void altera_mbox_rx_data(struct mbox_chan *chan)
118{
119 struct altera_mbox *mbox = mbox_chan_to_altera_mbox(chan);
120 u32 data[2];
121
122 if (altera_mbox_pending(mbox)) {
123 data[MBOX_PTR] =
124 readl_relaxed(mbox->mbox_base + MAILBOX_PTR_REG);
125 data[MBOX_CMD] =
126 readl_relaxed(mbox->mbox_base + MAILBOX_CMD_REG);
127 mbox_chan_received_data(chan, (void *)data);
128 }
129}
130
131static void altera_mbox_poll_rx(struct timer_list *t)
132{
133 struct altera_mbox *mbox = from_timer(mbox, t, rxpoll_timer);
134
135 altera_mbox_rx_data(mbox->chan);
136
137 mod_timer(&mbox->rxpoll_timer,
138 jiffies + msecs_to_jiffies(MBOX_POLLING_MS));
139}
140
141static irqreturn_t altera_mbox_tx_interrupt(int irq, void *p)
142{
143 struct mbox_chan *chan = (struct mbox_chan *)p;
144 struct altera_mbox *mbox = mbox_chan_to_altera_mbox(chan);
145
146 altera_mbox_tx_intmask(mbox, false);
147 mbox_chan_txdone(chan, 0);
148
149 return IRQ_HANDLED;
150}
151
152static irqreturn_t altera_mbox_rx_interrupt(int irq, void *p)
153{
154 struct mbox_chan *chan = (struct mbox_chan *)p;
155
156 altera_mbox_rx_data(chan);
157 return IRQ_HANDLED;
158}
159
160static int altera_mbox_startup_sender(struct mbox_chan *chan)
161{
162 int ret;
163 struct altera_mbox *mbox = mbox_chan_to_altera_mbox(chan);
164
165 if (mbox->intr_mode) {
166 ret = request_irq(mbox->irq, altera_mbox_tx_interrupt, 0,
167 DRIVER_NAME, chan);
168 if (unlikely(ret)) {
169 dev_err(mbox->dev,
170 "failed to register mailbox interrupt:%d\n",
171 ret);
172 return ret;
173 }
174 }
175
176 return 0;
177}
178
179static int altera_mbox_startup_receiver(struct mbox_chan *chan)
180{
181 int ret;
182 struct altera_mbox *mbox = mbox_chan_to_altera_mbox(chan);
183
184 if (mbox->intr_mode) {
185 ret = request_irq(mbox->irq, altera_mbox_rx_interrupt, 0,
186 DRIVER_NAME, chan);
187 if (unlikely(ret)) {
188 mbox->intr_mode = false;
189 goto polling; /* use polling if failed */
190 }
191
192 altera_mbox_rx_intmask(mbox, true);
193 return 0;
194 }
195
196polling:
197 /* Setup polling timer */
198 mbox->chan = chan;
199 timer_setup(&mbox->rxpoll_timer, altera_mbox_poll_rx, 0);
200 mod_timer(&mbox->rxpoll_timer,
201 jiffies + msecs_to_jiffies(MBOX_POLLING_MS));
202
203 return 0;
204}
205
206static int altera_mbox_send_data(struct mbox_chan *chan, void *data)
207{
208 struct altera_mbox *mbox = mbox_chan_to_altera_mbox(chan);
209 u32 *udata = (u32 *)data;
210
211 if (!mbox || !data)
212 return -EINVAL;
213 if (!mbox->is_sender) {
214 dev_warn(mbox->dev,
215 "failed to send. This is receiver mailbox.\n");
216 return -EINVAL;
217 }
218
219 if (altera_mbox_full(mbox))
220 return -EBUSY;
221
222 /* Enable interrupt before send */
223 if (mbox->intr_mode)
224 altera_mbox_tx_intmask(mbox, true);
225
226 /* Pointer register must write before command register */
227 writel_relaxed(udata[MBOX_PTR], mbox->mbox_base + MAILBOX_PTR_REG);
228 writel_relaxed(udata[MBOX_CMD], mbox->mbox_base + MAILBOX_CMD_REG);
229
230 return 0;
231}
232
233static bool altera_mbox_last_tx_done(struct mbox_chan *chan)
234{
235 struct altera_mbox *mbox = mbox_chan_to_altera_mbox(chan);
236
237 /* Return false if mailbox is full */
238 return altera_mbox_full(mbox) ? false : true;
239}
240
241static bool altera_mbox_peek_data(struct mbox_chan *chan)
242{
243 struct altera_mbox *mbox = mbox_chan_to_altera_mbox(chan);
244
245 return altera_mbox_pending(mbox) ? true : false;
246}
247
248static int altera_mbox_startup(struct mbox_chan *chan)
249{
250 struct altera_mbox *mbox = mbox_chan_to_altera_mbox(chan);
251 int ret = 0;
252
253 if (!mbox)
254 return -EINVAL;
255
256 if (mbox->is_sender)
257 ret = altera_mbox_startup_sender(chan);
258 else
259 ret = altera_mbox_startup_receiver(chan);
260
261 return ret;
262}
263
264static void altera_mbox_shutdown(struct mbox_chan *chan)
265{
266 struct altera_mbox *mbox = mbox_chan_to_altera_mbox(chan);
267
268 if (mbox->intr_mode) {
269 /* Unmask all interrupt masks */
270 writel_relaxed(~0, mbox->mbox_base + MAILBOX_INTMASK_REG);
271 free_irq(mbox->irq, chan);
272 } else if (!mbox->is_sender) {
273 del_timer_sync(&mbox->rxpoll_timer);
274 }
275}
276
277static const struct mbox_chan_ops altera_mbox_ops = {
278 .send_data = altera_mbox_send_data,
279 .startup = altera_mbox_startup,
280 .shutdown = altera_mbox_shutdown,
281 .last_tx_done = altera_mbox_last_tx_done,
282 .peek_data = altera_mbox_peek_data,
283};
284
285static int altera_mbox_probe(struct platform_device *pdev)
286{
287 struct altera_mbox *mbox;
288 struct mbox_chan *chans;
289 int ret;
290
291 mbox = devm_kzalloc(&pdev->dev, sizeof(*mbox),
292 GFP_KERNEL);
293 if (!mbox)
294 return -ENOMEM;
295
296 /* Allocated one channel */
297 chans = devm_kzalloc(&pdev->dev, sizeof(*chans), GFP_KERNEL);
298 if (!chans)
299 return -ENOMEM;
300
301 mbox->mbox_base = devm_platform_ioremap_resource(pdev, 0);
302 if (IS_ERR(mbox->mbox_base))
303 return PTR_ERR(mbox->mbox_base);
304
305 /* Check is it a sender or receiver? */
306 mbox->is_sender = altera_mbox_is_sender(mbox);
307
308 mbox->irq = platform_get_irq(pdev, 0);
309 if (mbox->irq >= 0)
310 mbox->intr_mode = true;
311
312 mbox->dev = &pdev->dev;
313
314 /* Hardware supports only one channel. */
315 chans[0].con_priv = mbox;
316 mbox->controller.dev = mbox->dev;
317 mbox->controller.num_chans = 1;
318 mbox->controller.chans = chans;
319 mbox->controller.ops = &altera_mbox_ops;
320
321 if (mbox->is_sender) {
322 if (mbox->intr_mode) {
323 mbox->controller.txdone_irq = true;
324 } else {
325 mbox->controller.txdone_poll = true;
326 mbox->controller.txpoll_period = MBOX_POLLING_MS;
327 }
328 }
329
330 ret = devm_mbox_controller_register(&pdev->dev, &mbox->controller);
331 if (ret) {
332 dev_err(&pdev->dev, "Register mailbox failed\n");
333 goto err;
334 }
335
336 platform_set_drvdata(pdev, mbox);
337err:
338 return ret;
339}
340
341static const struct of_device_id altera_mbox_match[] = {
342 { .compatible = "altr,mailbox-1.0" },
343 { /* Sentinel */ }
344};
345
346MODULE_DEVICE_TABLE(of, altera_mbox_match);
347
348static struct platform_driver altera_mbox_driver = {
349 .probe = altera_mbox_probe,
350 .driver = {
351 .name = DRIVER_NAME,
352 .of_match_table = altera_mbox_match,
353 },
354};
355
356module_platform_driver(altera_mbox_driver);
357
358MODULE_LICENSE("GPL v2");
359MODULE_DESCRIPTION("Altera mailbox specific functions");
360MODULE_AUTHOR("Ley Foon Tan <lftan@altera.com>");
361MODULE_ALIAS("platform:altera-mailbox");
1/*
2 * Copyright Altera Corporation (C) 2013-2014. All rights reserved
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program. If not, see <http://www.gnu.org/licenses/>.
15 */
16
17#include <linux/device.h>
18#include <linux/interrupt.h>
19#include <linux/io.h>
20#include <linux/kernel.h>
21#include <linux/mailbox_controller.h>
22#include <linux/module.h>
23#include <linux/of.h>
24#include <linux/platform_device.h>
25
26#define DRIVER_NAME "altera-mailbox"
27
28#define MAILBOX_CMD_REG 0x00
29#define MAILBOX_PTR_REG 0x04
30#define MAILBOX_STS_REG 0x08
31#define MAILBOX_INTMASK_REG 0x0C
32
33#define INT_PENDING_MSK 0x1
34#define INT_SPACE_MSK 0x2
35
36#define STS_PENDING_MSK 0x1
37#define STS_FULL_MSK 0x2
38#define STS_FULL_OFT 0x1
39
40#define MBOX_PENDING(status) (((status) & STS_PENDING_MSK))
41#define MBOX_FULL(status) (((status) & STS_FULL_MSK) >> STS_FULL_OFT)
42
43enum altera_mbox_msg {
44 MBOX_CMD = 0,
45 MBOX_PTR,
46};
47
48#define MBOX_POLLING_MS 5 /* polling interval 5ms */
49
50struct altera_mbox {
51 bool is_sender; /* 1-sender, 0-receiver */
52 bool intr_mode;
53 int irq;
54 void __iomem *mbox_base;
55 struct device *dev;
56 struct mbox_controller controller;
57
58 /* If the controller supports only RX polling mode */
59 struct timer_list rxpoll_timer;
60};
61
62static struct altera_mbox *mbox_chan_to_altera_mbox(struct mbox_chan *chan)
63{
64 if (!chan || !chan->con_priv)
65 return NULL;
66
67 return (struct altera_mbox *)chan->con_priv;
68}
69
70static inline int altera_mbox_full(struct altera_mbox *mbox)
71{
72 u32 status;
73
74 status = readl_relaxed(mbox->mbox_base + MAILBOX_STS_REG);
75 return MBOX_FULL(status);
76}
77
78static inline int altera_mbox_pending(struct altera_mbox *mbox)
79{
80 u32 status;
81
82 status = readl_relaxed(mbox->mbox_base + MAILBOX_STS_REG);
83 return MBOX_PENDING(status);
84}
85
86static void altera_mbox_rx_intmask(struct altera_mbox *mbox, bool enable)
87{
88 u32 mask;
89
90 mask = readl_relaxed(mbox->mbox_base + MAILBOX_INTMASK_REG);
91 if (enable)
92 mask |= INT_PENDING_MSK;
93 else
94 mask &= ~INT_PENDING_MSK;
95 writel_relaxed(mask, mbox->mbox_base + MAILBOX_INTMASK_REG);
96}
97
98static void altera_mbox_tx_intmask(struct altera_mbox *mbox, bool enable)
99{
100 u32 mask;
101
102 mask = readl_relaxed(mbox->mbox_base + MAILBOX_INTMASK_REG);
103 if (enable)
104 mask |= INT_SPACE_MSK;
105 else
106 mask &= ~INT_SPACE_MSK;
107 writel_relaxed(mask, mbox->mbox_base + MAILBOX_INTMASK_REG);
108}
109
110static bool altera_mbox_is_sender(struct altera_mbox *mbox)
111{
112 u32 reg;
113 /* Write a magic number to PTR register and read back this register.
114 * This register is read-write if it is a sender.
115 */
116 #define MBOX_MAGIC 0xA5A5AA55
117 writel_relaxed(MBOX_MAGIC, mbox->mbox_base + MAILBOX_PTR_REG);
118 reg = readl_relaxed(mbox->mbox_base + MAILBOX_PTR_REG);
119 if (reg == MBOX_MAGIC) {
120 /* Clear to 0 */
121 writel_relaxed(0, mbox->mbox_base + MAILBOX_PTR_REG);
122 return true;
123 }
124 return false;
125}
126
127static void altera_mbox_rx_data(struct mbox_chan *chan)
128{
129 struct altera_mbox *mbox = mbox_chan_to_altera_mbox(chan);
130 u32 data[2];
131
132 if (altera_mbox_pending(mbox)) {
133 data[MBOX_PTR] =
134 readl_relaxed(mbox->mbox_base + MAILBOX_PTR_REG);
135 data[MBOX_CMD] =
136 readl_relaxed(mbox->mbox_base + MAILBOX_CMD_REG);
137 mbox_chan_received_data(chan, (void *)data);
138 }
139}
140
141static void altera_mbox_poll_rx(unsigned long data)
142{
143 struct mbox_chan *chan = (struct mbox_chan *)data;
144 struct altera_mbox *mbox = mbox_chan_to_altera_mbox(chan);
145
146 altera_mbox_rx_data(chan);
147
148 mod_timer(&mbox->rxpoll_timer,
149 jiffies + msecs_to_jiffies(MBOX_POLLING_MS));
150}
151
152static irqreturn_t altera_mbox_tx_interrupt(int irq, void *p)
153{
154 struct mbox_chan *chan = (struct mbox_chan *)p;
155 struct altera_mbox *mbox = mbox_chan_to_altera_mbox(chan);
156
157 altera_mbox_tx_intmask(mbox, false);
158 mbox_chan_txdone(chan, 0);
159
160 return IRQ_HANDLED;
161}
162
163static irqreturn_t altera_mbox_rx_interrupt(int irq, void *p)
164{
165 struct mbox_chan *chan = (struct mbox_chan *)p;
166
167 altera_mbox_rx_data(chan);
168 return IRQ_HANDLED;
169}
170
171static int altera_mbox_startup_sender(struct mbox_chan *chan)
172{
173 int ret;
174 struct altera_mbox *mbox = mbox_chan_to_altera_mbox(chan);
175
176 if (mbox->intr_mode) {
177 ret = request_irq(mbox->irq, altera_mbox_tx_interrupt, 0,
178 DRIVER_NAME, chan);
179 if (unlikely(ret)) {
180 dev_err(mbox->dev,
181 "failed to register mailbox interrupt:%d\n",
182 ret);
183 return ret;
184 }
185 }
186
187 return 0;
188}
189
190static int altera_mbox_startup_receiver(struct mbox_chan *chan)
191{
192 int ret;
193 struct altera_mbox *mbox = mbox_chan_to_altera_mbox(chan);
194
195 if (mbox->intr_mode) {
196 ret = request_irq(mbox->irq, altera_mbox_rx_interrupt, 0,
197 DRIVER_NAME, chan);
198 if (unlikely(ret)) {
199 mbox->intr_mode = false;
200 goto polling; /* use polling if failed */
201 }
202
203 altera_mbox_rx_intmask(mbox, true);
204 return 0;
205 }
206
207polling:
208 /* Setup polling timer */
209 setup_timer(&mbox->rxpoll_timer, altera_mbox_poll_rx,
210 (unsigned long)chan);
211 mod_timer(&mbox->rxpoll_timer,
212 jiffies + msecs_to_jiffies(MBOX_POLLING_MS));
213
214 return 0;
215}
216
217static int altera_mbox_send_data(struct mbox_chan *chan, void *data)
218{
219 struct altera_mbox *mbox = mbox_chan_to_altera_mbox(chan);
220 u32 *udata = (u32 *)data;
221
222 if (!mbox || !data)
223 return -EINVAL;
224 if (!mbox->is_sender) {
225 dev_warn(mbox->dev,
226 "failed to send. This is receiver mailbox.\n");
227 return -EINVAL;
228 }
229
230 if (altera_mbox_full(mbox))
231 return -EBUSY;
232
233 /* Enable interrupt before send */
234 if (mbox->intr_mode)
235 altera_mbox_tx_intmask(mbox, true);
236
237 /* Pointer register must write before command register */
238 writel_relaxed(udata[MBOX_PTR], mbox->mbox_base + MAILBOX_PTR_REG);
239 writel_relaxed(udata[MBOX_CMD], mbox->mbox_base + MAILBOX_CMD_REG);
240
241 return 0;
242}
243
244static bool altera_mbox_last_tx_done(struct mbox_chan *chan)
245{
246 struct altera_mbox *mbox = mbox_chan_to_altera_mbox(chan);
247
248 /* Return false if mailbox is full */
249 return altera_mbox_full(mbox) ? false : true;
250}
251
252static bool altera_mbox_peek_data(struct mbox_chan *chan)
253{
254 struct altera_mbox *mbox = mbox_chan_to_altera_mbox(chan);
255
256 return altera_mbox_pending(mbox) ? true : false;
257}
258
259static int altera_mbox_startup(struct mbox_chan *chan)
260{
261 struct altera_mbox *mbox = mbox_chan_to_altera_mbox(chan);
262 int ret = 0;
263
264 if (!mbox)
265 return -EINVAL;
266
267 if (mbox->is_sender)
268 ret = altera_mbox_startup_sender(chan);
269 else
270 ret = altera_mbox_startup_receiver(chan);
271
272 return ret;
273}
274
275static void altera_mbox_shutdown(struct mbox_chan *chan)
276{
277 struct altera_mbox *mbox = mbox_chan_to_altera_mbox(chan);
278
279 if (mbox->intr_mode) {
280 /* Unmask all interrupt masks */
281 writel_relaxed(~0, mbox->mbox_base + MAILBOX_INTMASK_REG);
282 free_irq(mbox->irq, chan);
283 } else if (!mbox->is_sender) {
284 del_timer_sync(&mbox->rxpoll_timer);
285 }
286}
287
288static const struct mbox_chan_ops altera_mbox_ops = {
289 .send_data = altera_mbox_send_data,
290 .startup = altera_mbox_startup,
291 .shutdown = altera_mbox_shutdown,
292 .last_tx_done = altera_mbox_last_tx_done,
293 .peek_data = altera_mbox_peek_data,
294};
295
296static int altera_mbox_probe(struct platform_device *pdev)
297{
298 struct altera_mbox *mbox;
299 struct resource *regs;
300 struct mbox_chan *chans;
301 int ret;
302
303 mbox = devm_kzalloc(&pdev->dev, sizeof(*mbox),
304 GFP_KERNEL);
305 if (!mbox)
306 return -ENOMEM;
307
308 /* Allocated one channel */
309 chans = devm_kzalloc(&pdev->dev, sizeof(*chans), GFP_KERNEL);
310 if (!chans)
311 return -ENOMEM;
312
313 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
314
315 mbox->mbox_base = devm_ioremap_resource(&pdev->dev, regs);
316 if (IS_ERR(mbox->mbox_base))
317 return PTR_ERR(mbox->mbox_base);
318
319 /* Check is it a sender or receiver? */
320 mbox->is_sender = altera_mbox_is_sender(mbox);
321
322 mbox->irq = platform_get_irq(pdev, 0);
323 if (mbox->irq >= 0)
324 mbox->intr_mode = true;
325
326 mbox->dev = &pdev->dev;
327
328 /* Hardware supports only one channel. */
329 chans[0].con_priv = mbox;
330 mbox->controller.dev = mbox->dev;
331 mbox->controller.num_chans = 1;
332 mbox->controller.chans = chans;
333 mbox->controller.ops = &altera_mbox_ops;
334
335 if (mbox->is_sender) {
336 if (mbox->intr_mode) {
337 mbox->controller.txdone_irq = true;
338 } else {
339 mbox->controller.txdone_poll = true;
340 mbox->controller.txpoll_period = MBOX_POLLING_MS;
341 }
342 }
343
344 ret = mbox_controller_register(&mbox->controller);
345 if (ret) {
346 dev_err(&pdev->dev, "Register mailbox failed\n");
347 goto err;
348 }
349
350 platform_set_drvdata(pdev, mbox);
351err:
352 return ret;
353}
354
355static int altera_mbox_remove(struct platform_device *pdev)
356{
357 struct altera_mbox *mbox = platform_get_drvdata(pdev);
358
359 if (!mbox)
360 return -EINVAL;
361
362 mbox_controller_unregister(&mbox->controller);
363
364 return 0;
365}
366
367static const struct of_device_id altera_mbox_match[] = {
368 { .compatible = "altr,mailbox-1.0" },
369 { /* Sentinel */ }
370};
371
372MODULE_DEVICE_TABLE(of, altera_mbox_match);
373
374static struct platform_driver altera_mbox_driver = {
375 .probe = altera_mbox_probe,
376 .remove = altera_mbox_remove,
377 .driver = {
378 .name = DRIVER_NAME,
379 .of_match_table = altera_mbox_match,
380 },
381};
382
383module_platform_driver(altera_mbox_driver);
384
385MODULE_LICENSE("GPL v2");
386MODULE_DESCRIPTION("Altera mailbox specific functions");
387MODULE_AUTHOR("Ley Foon Tan <lftan@altera.com>");
388MODULE_ALIAS("platform:altera-mailbox");