1 // SPDX-License-Identifier: GPL-2.0-only
3  * Spreadtrum mailbox driver
85 			fifo_len = priv->outbox_fifo_depth;  in sprd_mbox_get_fifo_len()
89 		fifo_len = wr_pos - rd_pos;  in sprd_mbox_get_fifo_len()
91 		fifo_len = priv->outbox_fifo_depth - rd_pos + wr_pos;  in sprd_mbox_get_fifo_len()
104 	fifo_sts = readl(priv->outbox_base + SPRD_MBOX_FIFO_STS);  in sprd_mbox_outbox_isr()
108 		dev_warn_ratelimited(priv->dev, "spurious outbox interrupt\n");  in sprd_mbox_outbox_isr()
113 		msg[0] = readl(priv->outbox_base + SPRD_MBOX_MSG_LOW);  in sprd_mbox_outbox_isr()
114 		msg[1] = readl(priv->outbox_base + SPRD_MBOX_MSG_HIGH);  in sprd_mbox_outbox_isr()
115 		id = readl(priv->outbox_base + SPRD_MBOX_ID);  in sprd_mbox_outbox_isr()
117 		chan = &priv->chan[id];  in sprd_mbox_outbox_isr()
121 		writel(0x1, priv->outbox_base + SPRD_MBOX_TRIGGER);  in sprd_mbox_outbox_isr()
125 	writel(SPRD_MBOX_IRQ_CLR, priv->outbox_base + SPRD_MBOX_IRQ_STS);  in sprd_mbox_outbox_isr()
136 	fifo_sts = readl(priv->inbox_base + SPRD_MBOX_FIFO_STS);  in sprd_mbox_inbox_isr()
142 		dev_warn_ratelimited(priv->dev, "spurious inbox interrupt\n");  in sprd_mbox_inbox_isr()
148 		send_sts &= (send_sts - 1);  in sprd_mbox_inbox_isr()
150 		chan = &priv->chan[id];  in sprd_mbox_inbox_isr()
164 	       priv->inbox_base + SPRD_MBOX_FIFO_RST);  in sprd_mbox_inbox_isr()
167 	writel(SPRD_MBOX_IRQ_CLR, priv->inbox_base + SPRD_MBOX_IRQ_STS);  in sprd_mbox_inbox_isr()
174 	struct sprd_mbox_priv *priv = to_sprd_mbox_priv(chan->mbox);  in sprd_mbox_send_data()
175 	unsigned long id = (unsigned long)chan->con_priv;  in sprd_mbox_send_data()
179 	writel(data[0], priv->inbox_base + SPRD_MBOX_MSG_LOW);  in sprd_mbox_send_data()
180 	writel(data[1], priv->inbox_base + SPRD_MBOX_MSG_HIGH);  in sprd_mbox_send_data()
183 	writel(id, priv->inbox_base + SPRD_MBOX_ID);  in sprd_mbox_send_data()
186 	writel(0x1, priv->inbox_base + SPRD_MBOX_TRIGGER);  in sprd_mbox_send_data()
193 	struct sprd_mbox_priv *priv = to_sprd_mbox_priv(chan->mbox);  in sprd_mbox_flush()
194 	unsigned long id = (unsigned long)chan->con_priv;  in sprd_mbox_flush()
200 		busy = readl(priv->inbox_base + SPRD_MBOX_FIFO_STS) &  in sprd_mbox_flush()
210 	return -ETIME;  in sprd_mbox_flush()
215 	struct sprd_mbox_priv *priv = to_sprd_mbox_priv(chan->mbox);  in sprd_mbox_startup()
219 	writel(0x0, priv->outbox_base + SPRD_MBOX_FIFO_RST);  in sprd_mbox_startup()
222 	val = readl(priv->inbox_base + SPRD_MBOX_IRQ_MSK);  in sprd_mbox_startup()
224 	writel(val, priv->inbox_base + SPRD_MBOX_IRQ_MSK);  in sprd_mbox_startup()
227 	val = readl(priv->outbox_base + SPRD_MBOX_IRQ_MSK);  in sprd_mbox_startup()
229 	writel(val, priv->outbox_base + SPRD_MBOX_IRQ_MSK);  in sprd_mbox_startup()
236 	struct sprd_mbox_priv *priv = to_sprd_mbox_priv(chan->mbox);  in sprd_mbox_shutdown()
239 	writel(SPRD_INBOX_FIFO_IRQ_MASK, priv->inbox_base + SPRD_MBOX_IRQ_MSK);  in sprd_mbox_shutdown()
240 	writel(SPRD_OUTBOX_FIFO_IRQ_MASK, priv->outbox_base + SPRD_MBOX_IRQ_MSK);  in sprd_mbox_shutdown()
254 	clk_disable_unprepare(priv->clk);  in sprd_mbox_disable()
259 	struct device *dev = &pdev->dev;  in sprd_mbox_probe()
266 		return -ENOMEM;  in sprd_mbox_probe()
268 	priv->dev = dev;  in sprd_mbox_probe()
271 	 * The Spreadtrum mailbox uses an inbox to send messages to the target  in sprd_mbox_probe()
274 	 * Thus the mailbox controller supplies 2 different register addresses  in sprd_mbox_probe()
277 	priv->inbox_base = devm_platform_ioremap_resource(pdev, 0);  in sprd_mbox_probe()
278 	if (IS_ERR(priv->inbox_base))  in sprd_mbox_probe()
279 		return PTR_ERR(priv->inbox_base);  in sprd_mbox_probe()
281 	priv->outbox_base = devm_platform_ioremap_resource(pdev, 1);  in sprd_mbox_probe()
282 	if (IS_ERR(priv->outbox_base))  in sprd_mbox_probe()
283 		return PTR_ERR(priv->outbox_base);  in sprd_mbox_probe()
285 	priv->clk = devm_clk_get(dev, "enable");  in sprd_mbox_probe()
286 	if (IS_ERR(priv->clk)) {  in sprd_mbox_probe()
287 		dev_err(dev, "failed to get mailbox clock\n");  in sprd_mbox_probe()
288 		return PTR_ERR(priv->clk);  in sprd_mbox_probe()
291 	ret = clk_prepare_enable(priv->clk);  in sprd_mbox_probe()
297 		dev_err(dev, "failed to add mailbox disable action\n");  in sprd_mbox_probe()
324 	priv->outbox_fifo_depth =  in sprd_mbox_probe()
325 		readl(priv->outbox_base + SPRD_MBOX_FIFO_DEPTH) + 1;  in sprd_mbox_probe()
326 	priv->mbox.dev = dev;  in sprd_mbox_probe()
327 	priv->mbox.chans = &priv->chan[0];  in sprd_mbox_probe()
328 	priv->mbox.num_chans = SPRD_MBOX_CHAN_MAX;  in sprd_mbox_probe()
329 	priv->mbox.ops = &sprd_mbox_ops;  in sprd_mbox_probe()
330 	priv->mbox.txdone_irq = true;  in sprd_mbox_probe()
333 		priv->chan[id].con_priv = (void *)id;  in sprd_mbox_probe()
335 	ret = devm_mbox_controller_register(dev, &priv->mbox);  in sprd_mbox_probe()
337 		dev_err(dev, "failed to register mailbox: %d\n", ret);  in sprd_mbox_probe()
345 	{ .compatible = "sprd,sc9860-mailbox", },
352 		.name = "sprd-mailbox",
360 MODULE_DESCRIPTION("Spreadtrum mailbox driver");