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
19 #include <linux/apple-mailbox.h>
113 		readl_relaxed(apple_mbox->regs + apple_mbox->hw->a2i_control);  in apple_mbox_hw_can_send()
115 	return !(mbox_ctrl & apple_mbox->hw->control_full);  in apple_mbox_hw_can_send()
121 		readl_relaxed(apple_mbox->regs + apple_mbox->hw->a2i_control);  in apple_mbox_hw_send_empty()
123 	return mbox_ctrl & apple_mbox->hw->control_empty;  in apple_mbox_hw_send_empty()
130 		return -EBUSY;  in apple_mbox_hw_send()
132 	dev_dbg(apple_mbox->dev, "> TX %016llx %08x\n", msg->msg0, msg->msg1);  in apple_mbox_hw_send()
134 	writeq_relaxed(msg->msg0, apple_mbox->regs + apple_mbox->hw->a2i_send0);  in apple_mbox_hw_send()
135 	writeq_relaxed(FIELD_PREP(APPLE_MBOX_MSG1_MSG, msg->msg1),  in apple_mbox_hw_send()
136 		       apple_mbox->regs + apple_mbox->hw->a2i_send1);  in apple_mbox_hw_send()
144 		readl_relaxed(apple_mbox->regs + apple_mbox->hw->i2a_control);  in apple_mbox_hw_can_recv()
146 	return !(mbox_ctrl & apple_mbox->hw->control_empty);  in apple_mbox_hw_can_recv()
153 		return -ENOMSG;  in apple_mbox_hw_recv()
155 	msg->msg0 = readq_relaxed(apple_mbox->regs + apple_mbox->hw->i2a_recv0);  in apple_mbox_hw_recv()
156 	msg->msg1 = FIELD_GET(  in apple_mbox_hw_recv()
158 		readq_relaxed(apple_mbox->regs + apple_mbox->hw->i2a_recv1));  in apple_mbox_hw_recv()
160 	dev_dbg(apple_mbox->dev, "< RX %016llx %08x\n", msg->msg0, msg->msg1);  in apple_mbox_hw_recv()
167 	struct apple_mbox *apple_mbox = chan->con_priv;  in apple_mbox_chan_send_data()
177 	 * FIFO is empty. It will also keep firing if the FIFO was empty  in apple_mbox_chan_send_data()
181 	 * If the FIFO is already empty before the ack it will fire again  in apple_mbox_chan_send_data()
184 	if (apple_mbox->hw->has_irq_controls) {  in apple_mbox_chan_send_data()
185 		writel_relaxed(apple_mbox->hw->irq_bit_send_empty,  in apple_mbox_chan_send_data()
186 			       apple_mbox->regs + apple_mbox->hw->irq_ack);  in apple_mbox_chan_send_data()
188 	enable_irq(apple_mbox->irq_send_empty);  in apple_mbox_chan_send_data()
204 	disable_irq_nosync(apple_mbox->irq_send_empty);  in apple_mbox_send_empty_irq()
205 	mbox_chan_txdone(&apple_mbox->chan, 0);  in apple_mbox_send_empty_irq()
215 		mbox_chan_received_data(&apple_mbox->chan, (void *)&msg);  in apple_mbox_poll()
227 	if (apple_mbox->hw->has_irq_controls) {  in apple_mbox_poll()
228 		writel_relaxed(apple_mbox->hw->irq_bit_recv_not_empty,  in apple_mbox_poll()
229 			       apple_mbox->regs + apple_mbox->hw->irq_ack);  in apple_mbox_poll()
239 	spin_lock(&apple_mbox->rx_lock);  in apple_mbox_recv_irq()
241 	spin_unlock(&apple_mbox->rx_lock);  in apple_mbox_recv_irq()
248 	struct apple_mbox *apple_mbox = chan->con_priv;  in apple_mbox_chan_peek_data()
252 	spin_lock_irqsave(&apple_mbox->rx_lock, flags);  in apple_mbox_chan_peek_data()
254 	spin_unlock_irqrestore(&apple_mbox->rx_lock, flags);  in apple_mbox_chan_peek_data()
261 	struct apple_mbox *apple_mbox = chan->con_priv;  in apple_mbox_chan_flush()
266 			mbox_chan_txdone(&apple_mbox->chan, 0);  in apple_mbox_chan_flush()
273 	return -ETIME;  in apple_mbox_chan_flush()
278 	struct apple_mbox *apple_mbox = chan->con_priv;  in apple_mbox_chan_startup()
288 	if (apple_mbox->hw->has_irq_controls) {  in apple_mbox_chan_startup()
289 		writel_relaxed(apple_mbox->hw->irq_bit_recv_not_empty |  in apple_mbox_chan_startup()
290 				       apple_mbox->hw->irq_bit_send_empty,  in apple_mbox_chan_startup()
291 			       apple_mbox->regs + apple_mbox->hw->irq_enable);  in apple_mbox_chan_startup()
294 	enable_irq(apple_mbox->irq_recv_not_empty);  in apple_mbox_chan_startup()
300 	struct apple_mbox *apple_mbox = chan->con_priv;  in apple_mbox_chan_shutdown()
302 	disable_irq(apple_mbox->irq_recv_not_empty);  in apple_mbox_chan_shutdown()
316 	if (args->args_count != 0)  in apple_mbox_of_xlate()
317 		return ERR_PTR(-EINVAL);  in apple_mbox_of_xlate()
319 	return &mbox->chans[0];  in apple_mbox_of_xlate()
328 	struct device *dev = &pdev->dev;  in apple_mbox_probe()
330 	match = of_match_node(apple_mbox_of_match, pdev->dev.of_node);  in apple_mbox_probe()
332 		return -EINVAL;  in apple_mbox_probe()
333 	if (!match->data)  in apple_mbox_probe()
334 		return -EINVAL;  in apple_mbox_probe()
338 		return -ENOMEM;  in apple_mbox_probe()
341 	mbox->dev = dev;  in apple_mbox_probe()
342 	mbox->regs = devm_platform_ioremap_resource(pdev, 0);  in apple_mbox_probe()
343 	if (IS_ERR(mbox->regs))  in apple_mbox_probe()
344 		return PTR_ERR(mbox->regs);  in apple_mbox_probe()
346 	mbox->hw = match->data;  in apple_mbox_probe()
347 	mbox->irq_recv_not_empty =  in apple_mbox_probe()
348 		platform_get_irq_byname(pdev, "recv-not-empty");  in apple_mbox_probe()
349 	if (mbox->irq_recv_not_empty < 0)  in apple_mbox_probe()
350 		return -ENODEV;  in apple_mbox_probe()
352 	mbox->irq_send_empty = platform_get_irq_byname(pdev, "send-empty");  in apple_mbox_probe()
353 	if (mbox->irq_send_empty < 0)  in apple_mbox_probe()
354 		return -ENODEV;  in apple_mbox_probe()
356 	mbox->controller.dev = mbox->dev;  in apple_mbox_probe()
357 	mbox->controller.num_chans = 1;  in apple_mbox_probe()
358 	mbox->controller.chans = &mbox->chan;  in apple_mbox_probe()
359 	mbox->controller.ops = &apple_mbox_ops;  in apple_mbox_probe()
360 	mbox->controller.txdone_irq = true;  in apple_mbox_probe()
361 	mbox->controller.of_xlate = apple_mbox_of_xlate;  in apple_mbox_probe()
362 	mbox->chan.con_priv = mbox;  in apple_mbox_probe()
363 	spin_lock_init(&mbox->rx_lock);  in apple_mbox_probe()
365 	irqname = devm_kasprintf(dev, GFP_KERNEL, "%s-recv", dev_name(dev));  in apple_mbox_probe()
367 		return -ENOMEM;  in apple_mbox_probe()
369 	ret = devm_request_threaded_irq(dev, mbox->irq_recv_not_empty, NULL,  in apple_mbox_probe()
376 	irqname = devm_kasprintf(dev, GFP_KERNEL, "%s-send", dev_name(dev));  in apple_mbox_probe()
378 		return -ENOMEM;  in apple_mbox_probe()
380 	ret = devm_request_irq(dev, mbox->irq_send_empty,  in apple_mbox_probe()
386 	return devm_mbox_controller_register(dev, &mbox->controller);  in apple_mbox_probe()
424 	{ .compatible = "apple,asc-mailbox-v4", .data = &apple_mbox_asc_hw },
425 	{ .compatible = "apple,m3-mailbox-v2", .data = &apple_mbox_m3_hw },
432 		.name = "apple-mailbox",