1 // SPDX-License-Identifier: GPL-2.0-only
3  * Spreadtrum mailbox driver
91 			fifo_len = priv->outbox_fifo_depth;  in sprd_mbox_get_fifo_len()
95 		fifo_len = wr_pos - rd_pos;  in sprd_mbox_get_fifo_len()
97 		fifo_len = priv->outbox_fifo_depth - rd_pos + wr_pos;  in sprd_mbox_get_fifo_len()
113 		dev_warn_ratelimited(priv->dev, "spurious outbox interrupt\n");  in do_outbox_isr()
122 		chan = &priv->chan[id];  in do_outbox_isr()
123 		if (chan->cl)  in do_outbox_isr()
126 			dev_warn_ratelimited(priv->dev,  in do_outbox_isr()
143 	return do_outbox_isr(priv->outbox_base, priv);  in sprd_mbox_outbox_isr()
150 	return do_outbox_isr(priv->supp_base, priv);  in sprd_mbox_supp_isr()
159 	fifo_sts = readl(priv->inbox_base + SPRD_MBOX_FIFO_STS);  in sprd_mbox_inbox_isr()
165 		dev_warn_ratelimited(priv->dev, "spurious inbox interrupt\n");  in sprd_mbox_inbox_isr()
171 		send_sts &= (send_sts - 1);  in sprd_mbox_inbox_isr()
173 		chan = &priv->chan[id];  in sprd_mbox_inbox_isr()
187 	       priv->inbox_base + SPRD_MBOX_FIFO_RST);  in sprd_mbox_inbox_isr()
190 	writel(SPRD_MBOX_IRQ_CLR, priv->inbox_base + SPRD_MBOX_IRQ_STS);  in sprd_mbox_inbox_isr()
197 	struct sprd_mbox_priv *priv = to_sprd_mbox_priv(chan->mbox);  in sprd_mbox_send_data()
198 	unsigned long id = (unsigned long)chan->con_priv;  in sprd_mbox_send_data()
202 	writel(data[0], priv->inbox_base + SPRD_MBOX_MSG_LOW);  in sprd_mbox_send_data()
203 	writel(data[1], priv->inbox_base + SPRD_MBOX_MSG_HIGH);  in sprd_mbox_send_data()
206 	writel(id, priv->inbox_base + SPRD_MBOX_ID);  in sprd_mbox_send_data()
209 	writel(0x1, priv->inbox_base + SPRD_MBOX_TRIGGER);  in sprd_mbox_send_data()
216 	struct sprd_mbox_priv *priv = to_sprd_mbox_priv(chan->mbox);  in sprd_mbox_flush()
217 	unsigned long id = (unsigned long)chan->con_priv;  in sprd_mbox_flush()
223 		busy = readl(priv->inbox_base + SPRD_MBOX_FIFO_STS) &  in sprd_mbox_flush()
233 	return -ETIME;  in sprd_mbox_flush()
238 	struct sprd_mbox_priv *priv = to_sprd_mbox_priv(chan->mbox);  in sprd_mbox_startup()
241 	mutex_lock(&priv->lock);  in sprd_mbox_startup()
242 	if (priv->refcnt++ == 0) {  in sprd_mbox_startup()
244 		writel(0x0, priv->outbox_base + SPRD_MBOX_FIFO_RST);  in sprd_mbox_startup()
247 		val = readl(priv->inbox_base + SPRD_MBOX_IRQ_MSK);  in sprd_mbox_startup()
249 		writel(val, priv->inbox_base + SPRD_MBOX_IRQ_MSK);  in sprd_mbox_startup()
252 		val = readl(priv->outbox_base + SPRD_MBOX_IRQ_MSK);  in sprd_mbox_startup()
254 		writel(val, priv->outbox_base + SPRD_MBOX_IRQ_MSK);  in sprd_mbox_startup()
257 		if (priv->supp_base) {  in sprd_mbox_startup()
258 			writel(0x0, priv->supp_base + SPRD_MBOX_FIFO_RST);  in sprd_mbox_startup()
259 			val = readl(priv->supp_base + SPRD_MBOX_IRQ_MSK);  in sprd_mbox_startup()
261 			writel(val, priv->supp_base + SPRD_MBOX_IRQ_MSK);  in sprd_mbox_startup()
264 	mutex_unlock(&priv->lock);  in sprd_mbox_startup()
271 	struct sprd_mbox_priv *priv = to_sprd_mbox_priv(chan->mbox);  in sprd_mbox_shutdown()
273 	mutex_lock(&priv->lock);  in sprd_mbox_shutdown()
274 	if (--priv->refcnt == 0) {  in sprd_mbox_shutdown()
276 		writel(SPRD_INBOX_FIFO_IRQ_MASK, priv->inbox_base + SPRD_MBOX_IRQ_MSK);  in sprd_mbox_shutdown()
277 		writel(SPRD_OUTBOX_FIFO_IRQ_MASK, priv->outbox_base + SPRD_MBOX_IRQ_MSK);  in sprd_mbox_shutdown()
279 		if (priv->supp_base)  in sprd_mbox_shutdown()
281 			       priv->supp_base + SPRD_MBOX_IRQ_MSK);  in sprd_mbox_shutdown()
283 	mutex_unlock(&priv->lock);  in sprd_mbox_shutdown()
295 	struct device *dev = &pdev->dev;  in sprd_mbox_probe()
303 		return -ENOMEM;  in sprd_mbox_probe()
305 	priv->dev = dev;  in sprd_mbox_probe()
306 	mutex_init(&priv->lock);  in sprd_mbox_probe()
309 	 * Unisoc mailbox uses an inbox to send messages to the target  in sprd_mbox_probe()
313 	 * Thus in general the mailbox controller supplies 2 different  in sprd_mbox_probe()
319 	priv->inbox_base = devm_platform_ioremap_resource(pdev, 0);  in sprd_mbox_probe()
320 	if (IS_ERR(priv->inbox_base))  in sprd_mbox_probe()
321 		return PTR_ERR(priv->inbox_base);  in sprd_mbox_probe()
323 	priv->outbox_base = devm_platform_ioremap_resource(pdev, 1);  in sprd_mbox_probe()
324 	if (IS_ERR(priv->outbox_base))  in sprd_mbox_probe()
325 		return PTR_ERR(priv->outbox_base);  in sprd_mbox_probe()
329 		dev_err(dev, "failed to get mailbox clock\n");  in sprd_mbox_probe()
356 	supp_irq = platform_get_irq_byname(pdev, "supp-outbox");  in sprd_mbox_probe()
368 			return -ENODEV;  in sprd_mbox_probe()
370 		priv->supp_base = priv->outbox_base + (SPRD_OUTBOX_BASE_SPAN * supp);  in sprd_mbox_probe()
374 	priv->outbox_fifo_depth =  in sprd_mbox_probe()
375 		readl(priv->outbox_base + SPRD_MBOX_FIFO_DEPTH) + 1;  in sprd_mbox_probe()
376 	priv->mbox.dev = dev;  in sprd_mbox_probe()
377 	priv->mbox.chans = &priv->chan[0];  in sprd_mbox_probe()
378 	priv->mbox.num_chans = SPRD_MBOX_CHAN_MAX;  in sprd_mbox_probe()
379 	priv->mbox.ops = &sprd_mbox_ops;  in sprd_mbox_probe()
380 	priv->mbox.txdone_irq = true;  in sprd_mbox_probe()
383 		priv->chan[id].con_priv = (void *)id;  in sprd_mbox_probe()
385 	ret = devm_mbox_controller_register(dev, &priv->mbox);  in sprd_mbox_probe()
387 		dev_err(dev, "failed to register mailbox: %d\n", ret);  in sprd_mbox_probe()
395 	{ .compatible = "sprd,sc9860-mailbox" },
396 	{ .compatible = "sprd,sc9863a-mailbox",
404 		.name = "sprd-mailbox",
412 MODULE_DESCRIPTION("Spreadtrum mailbox driver");