1 // SPDX-License-Identifier: GPL-2.0-only OR MIT
9  * exchange 64+32 bit messages between the main CPU and a co-processor.
13  * Both the main CPU and the co-processor see the same set of registers but
99 int apple_mbox_send(struct apple_mbox *mbox, const struct apple_mbox_msg msg,  in apple_mbox_send()  argument
107 	spin_lock_irqsave(&mbox->tx_lock, flags);  in apple_mbox_send()
108 	mbox_ctrl = readl_relaxed(mbox->regs + mbox->hw->a2i_control);  in apple_mbox_send()
110 	while (mbox_ctrl & mbox->hw->control_full) {  in apple_mbox_send()
113 				mbox->regs + mbox->hw->a2i_control, mbox_ctrl,  in apple_mbox_send()
114 				!(mbox_ctrl & mbox->hw->control_full), 100,  in apple_mbox_send()
118 				spin_unlock_irqrestore(&mbox->tx_lock, flags);  in apple_mbox_send()
133 		if (mbox->hw->has_irq_controls) {  in apple_mbox_send()
134 			writel_relaxed(mbox->hw->irq_bit_send_empty,  in apple_mbox_send()
135 				       mbox->regs + mbox->hw->irq_ack);  in apple_mbox_send()
137 		enable_irq(mbox->irq_send_empty);  in apple_mbox_send()
138 		reinit_completion(&mbox->tx_empty);  in apple_mbox_send()
139 		spin_unlock_irqrestore(&mbox->tx_lock, flags);  in apple_mbox_send()
142 			&mbox->tx_empty,  in apple_mbox_send()
147 			return -ETIMEDOUT;  in apple_mbox_send()
149 		spin_lock_irqsave(&mbox->tx_lock, flags);  in apple_mbox_send()
150 		mbox_ctrl = readl_relaxed(mbox->regs + mbox->hw->a2i_control);  in apple_mbox_send()
153 	writeq_relaxed(msg.msg0, mbox->regs + mbox->hw->a2i_send0);  in apple_mbox_send()
155 		       mbox->regs + mbox->hw->a2i_send1);  in apple_mbox_send()
157 	spin_unlock_irqrestore(&mbox->tx_lock, flags);  in apple_mbox_send()
165 	struct apple_mbox *mbox = data;  in apple_mbox_send_empty_irq()  local
174 	spin_lock(&mbox->tx_lock);  in apple_mbox_send_empty_irq()
175 	disable_irq_nosync(mbox->irq_send_empty);  in apple_mbox_send_empty_irq()
176 	complete(&mbox->tx_empty);  in apple_mbox_send_empty_irq()
177 	spin_unlock(&mbox->tx_lock);  in apple_mbox_send_empty_irq()
182 static int apple_mbox_poll_locked(struct apple_mbox *mbox)  in apple_mbox_poll_locked()  argument
187 	u32 mbox_ctrl = readl_relaxed(mbox->regs + mbox->hw->i2a_control);  in apple_mbox_poll_locked()
189 	while (!(mbox_ctrl & mbox->hw->control_empty)) {  in apple_mbox_poll_locked()
190 		msg.msg0 = readq_relaxed(mbox->regs + mbox->hw->i2a_recv0);  in apple_mbox_poll_locked()
193 			readq_relaxed(mbox->regs + mbox->hw->i2a_recv1));  in apple_mbox_poll_locked()
195 		mbox->rx(mbox, msg, mbox->cookie);  in apple_mbox_poll_locked()
197 		mbox_ctrl = readl_relaxed(mbox->regs + mbox->hw->i2a_control);  in apple_mbox_poll_locked()
208 	if (mbox->hw->has_irq_controls) {  in apple_mbox_poll_locked()
209 		writel_relaxed(mbox->hw->irq_bit_recv_not_empty,  in apple_mbox_poll_locked()
210 			       mbox->regs + mbox->hw->irq_ack);  in apple_mbox_poll_locked()
218 	struct apple_mbox *mbox = data;  in apple_mbox_recv_irq()  local
220 	spin_lock(&mbox->rx_lock);  in apple_mbox_recv_irq()
221 	apple_mbox_poll_locked(mbox);  in apple_mbox_recv_irq()
222 	spin_unlock(&mbox->rx_lock);  in apple_mbox_recv_irq()
227 int apple_mbox_poll(struct apple_mbox *mbox)  in apple_mbox_poll()  argument
232 	spin_lock_irqsave(&mbox->rx_lock, flags);  in apple_mbox_poll()
233 	ret = apple_mbox_poll_locked(mbox);  in apple_mbox_poll()
234 	spin_unlock_irqrestore(&mbox->rx_lock, flags);  in apple_mbox_poll()
240 int apple_mbox_start(struct apple_mbox *mbox)  in apple_mbox_start()  argument
244 	if (mbox->active)  in apple_mbox_start()
247 	ret = pm_runtime_resume_and_get(mbox->dev);  in apple_mbox_start()
259 	if (mbox->hw->has_irq_controls) {  in apple_mbox_start()
260 		writel_relaxed(mbox->hw->irq_bit_recv_not_empty |  in apple_mbox_start()
261 				       mbox->hw->irq_bit_send_empty,  in apple_mbox_start()
262 			       mbox->regs + mbox->hw->irq_enable);  in apple_mbox_start()
265 	enable_irq(mbox->irq_recv_not_empty);  in apple_mbox_start()
266 	mbox->active = true;  in apple_mbox_start()
271 void apple_mbox_stop(struct apple_mbox *mbox)  in apple_mbox_stop()  argument
273 	if (!mbox->active)  in apple_mbox_stop()
276 	mbox->active = false;  in apple_mbox_stop()
277 	disable_irq(mbox->irq_recv_not_empty);  in apple_mbox_stop()
278 	pm_runtime_mark_last_busy(mbox->dev);  in apple_mbox_stop()
279 	pm_runtime_put_autosuspend(mbox->dev);  in apple_mbox_stop()
287 	struct apple_mbox *mbox;  in apple_mbox_get()  local
290 	ret = of_parse_phandle_with_args(dev->of_node, "mboxes", "#mbox-cells",  in apple_mbox_get()
299 		return ERR_PTR(-EPROBE_DEFER);  in apple_mbox_get()
301 	mbox = platform_get_drvdata(pdev);  in apple_mbox_get()
302 	if (!mbox)  in apple_mbox_get()
303 		return ERR_PTR(-EPROBE_DEFER);  in apple_mbox_get()
305 	if (!device_link_add(dev, &pdev->dev, DL_FLAG_AUTOREMOVE_CONSUMER))  in apple_mbox_get()
306 		return ERR_PTR(-ENODEV);  in apple_mbox_get()
308 	return mbox;  in apple_mbox_get()
312 struct apple_mbox *apple_mbox_get_byname(struct device *dev, const char *name)  in apple_mbox_get_byname()  argument
316 	index = of_property_match_string(dev->of_node, "mbox-names", name);  in apple_mbox_get_byname()
328 	struct apple_mbox *mbox;  in apple_mbox_probe()  local
329 	struct device *dev = &pdev->dev;  in apple_mbox_probe()
331 	mbox = devm_kzalloc(dev, sizeof(*mbox), GFP_KERNEL);  in apple_mbox_probe()
332 	if (!mbox)  in apple_mbox_probe()
333 		return -ENOMEM;  in apple_mbox_probe()
335 	mbox->dev = &pdev->dev;  in apple_mbox_probe()
336 	mbox->hw = of_device_get_match_data(dev);  in apple_mbox_probe()
337 	if (!mbox->hw)  in apple_mbox_probe()
338 		return -EINVAL;  in apple_mbox_probe()
340 	mbox->regs = devm_platform_ioremap_resource(pdev, 0);  in apple_mbox_probe()
341 	if (IS_ERR(mbox->regs))  in apple_mbox_probe()
342 		return PTR_ERR(mbox->regs);  in apple_mbox_probe()
344 	mbox->irq_recv_not_empty =  in apple_mbox_probe()
345 		platform_get_irq_byname(pdev, "recv-not-empty");  in apple_mbox_probe()
346 	if (mbox->irq_recv_not_empty < 0)  in apple_mbox_probe()
347 		return -ENODEV;  in apple_mbox_probe()
349 	mbox->irq_send_empty = platform_get_irq_byname(pdev, "send-empty");  in apple_mbox_probe()
350 	if (mbox->irq_send_empty < 0)  in apple_mbox_probe()
351 		return -ENODEV;  in apple_mbox_probe()
353 	spin_lock_init(&mbox->rx_lock);  in apple_mbox_probe()
354 	spin_lock_init(&mbox->tx_lock);  in apple_mbox_probe()
355 	init_completion(&mbox->tx_empty);  in apple_mbox_probe()
357 	irqname = devm_kasprintf(dev, GFP_KERNEL, "%s-recv", dev_name(dev));  in apple_mbox_probe()
359 		return -ENOMEM;  in apple_mbox_probe()
361 	ret = devm_request_irq(dev, mbox->irq_recv_not_empty,  in apple_mbox_probe()
363 			       IRQF_NO_AUTOEN | IRQF_NO_SUSPEND, irqname, mbox);  in apple_mbox_probe()
367 	irqname = devm_kasprintf(dev, GFP_KERNEL, "%s-send", dev_name(dev));  in apple_mbox_probe()
369 		return -ENOMEM;  in apple_mbox_probe()
371 	ret = devm_request_irq(dev, mbox->irq_send_empty,  in apple_mbox_probe()
373 			       IRQF_NO_AUTOEN | IRQF_NO_SUSPEND, irqname, mbox);  in apple_mbox_probe()
381 	platform_set_drvdata(pdev, mbox);  in apple_mbox_probe()
420 	{ .compatible = "apple,asc-mailbox-v4", .data = &apple_mbox_asc_hw },
421 	{ .compatible = "apple,m3-mailbox-v2", .data = &apple_mbox_m3_hw },
428 		.name = "apple-mailbox",