1 // SPDX-License-Identifier: GPL-2.0
3 // Copyright (c) 2017-2019 Samuel Holland <samuel@sholland.org>
44 #define mbox_dbg(mbox, ...)	dev_dbg((mbox)->controller.dev, __VA_ARGS__)
58 	return chan - chan->mbox->chans;  in channel_number()
63 	return chan->con_priv;  in to_sun6i_msgbox()
73 	status = readl(mbox->regs + LOCAL_IRQ_EN_REG) &  in sun6i_msgbox_irq()
74 		 readl(mbox->regs + LOCAL_IRQ_STAT_REG);  in sun6i_msgbox_irq()
80 		struct mbox_chan *chan = &mbox->controller.chans[n];  in sun6i_msgbox_irq()
86 			uint32_t msg = readl(mbox->regs + MSG_DATA_REG(n));  in sun6i_msgbox_irq()
93 		writel(RX_IRQ(n), mbox->regs + LOCAL_IRQ_STAT_REG);  in sun6i_msgbox_irq()
106 	if (WARN_ON_ONCE(!(readl(mbox->regs + CTRL_REG(n)) & CTRL_TX(n))))  in sun6i_msgbox_send_data()
109 	writel(msg, mbox->regs + MSG_DATA_REG(n));  in sun6i_msgbox_send_data()
121 	if (readl(mbox->regs + CTRL_REG(n)) & CTRL_RX(n)) {  in sun6i_msgbox_startup()
124 			readl(mbox->regs + MSG_DATA_REG(n));  in sun6i_msgbox_startup()
125 		writel(RX_IRQ(n), mbox->regs + LOCAL_IRQ_STAT_REG);  in sun6i_msgbox_startup()
128 		spin_lock(&mbox->lock);  in sun6i_msgbox_startup()
129 		writel(readl(mbox->regs + LOCAL_IRQ_EN_REG) | RX_IRQ(n),  in sun6i_msgbox_startup()
130 		       mbox->regs + LOCAL_IRQ_EN_REG);  in sun6i_msgbox_startup()
131 		spin_unlock(&mbox->lock);  in sun6i_msgbox_startup()
144 	if (readl(mbox->regs + CTRL_REG(n)) & CTRL_RX(n)) {  in sun6i_msgbox_shutdown()
146 		spin_lock(&mbox->lock);  in sun6i_msgbox_shutdown()
147 		writel(readl(mbox->regs + LOCAL_IRQ_EN_REG) & ~RX_IRQ(n),  in sun6i_msgbox_shutdown()
148 		       mbox->regs + LOCAL_IRQ_EN_REG);  in sun6i_msgbox_shutdown()
149 		spin_unlock(&mbox->lock);  in sun6i_msgbox_shutdown()
154 				readl(mbox->regs + MSG_DATA_REG(n));  in sun6i_msgbox_shutdown()
155 			writel(RX_IRQ(n), mbox->regs + LOCAL_IRQ_STAT_REG);  in sun6i_msgbox_shutdown()
156 		} while (readl(mbox->regs + LOCAL_IRQ_STAT_REG) & RX_IRQ(n));  in sun6i_msgbox_shutdown()
176 	return !(readl(mbox->regs + REMOTE_IRQ_STAT_REG) & RX_IRQ(n));  in sun6i_msgbox_last_tx_done()
184 	return readl(mbox->regs + MSG_STAT_REG(n)) & MSG_STAT_MASK;  in sun6i_msgbox_peek_data()
197 	struct device *dev = &pdev->dev;  in sun6i_msgbox_probe()
206 		return -ENOMEM;  in sun6i_msgbox_probe()
210 		return -ENOMEM;  in sun6i_msgbox_probe()
215 	mbox->clk = devm_clk_get(dev, NULL);  in sun6i_msgbox_probe()
216 	if (IS_ERR(mbox->clk)) {  in sun6i_msgbox_probe()
217 		ret = PTR_ERR(mbox->clk);  in sun6i_msgbox_probe()
222 	ret = clk_prepare_enable(mbox->clk);  in sun6i_msgbox_probe()
251 		ret = -ENODEV;  in sun6i_msgbox_probe()
255 	mbox->regs = devm_ioremap_resource(&pdev->dev, res);  in sun6i_msgbox_probe()
256 	if (IS_ERR(mbox->regs)) {  in sun6i_msgbox_probe()
257 		ret = PTR_ERR(mbox->regs);  in sun6i_msgbox_probe()
262 	/* Disable all IRQs for this end of the msgbox. */  in sun6i_msgbox_probe()
263 	writel(0, mbox->regs + LOCAL_IRQ_EN_REG);  in sun6i_msgbox_probe()
265 	ret = devm_request_irq(dev, irq_of_parse_and_map(dev->of_node, 0),  in sun6i_msgbox_probe()
272 	mbox->controller.dev           = dev;  in sun6i_msgbox_probe()
273 	mbox->controller.ops           = &sun6i_msgbox_chan_ops;  in sun6i_msgbox_probe()
274 	mbox->controller.chans         = chans;  in sun6i_msgbox_probe()
275 	mbox->controller.num_chans     = NUM_CHANS;  in sun6i_msgbox_probe()
276 	mbox->controller.txdone_irq    = false;  in sun6i_msgbox_probe()
277 	mbox->controller.txdone_poll   = true;  in sun6i_msgbox_probe()
278 	mbox->controller.txpoll_period = 5;  in sun6i_msgbox_probe()
280 	spin_lock_init(&mbox->lock);  in sun6i_msgbox_probe()
283 	ret = mbox_controller_register(&mbox->controller);  in sun6i_msgbox_probe()
292 	clk_disable_unprepare(mbox->clk);  in sun6i_msgbox_probe()
301 	mbox_controller_unregister(&mbox->controller);  in sun6i_msgbox_remove()
303 	clk_disable_unprepare(mbox->clk);  in sun6i_msgbox_remove()
309 	{ .compatible = "allwinner,sun6i-a31-msgbox", },
316 		.name = "sun6i-msgbox",
325 MODULE_DESCRIPTION("Allwinner sun6i/sun8i/sun9i/sun50i Message Box");