1 // SPDX-License-Identifier: GPL-2.0-only
6 //   Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com
23 	int signal;  member
41 		.signal = 3,
42 		.name_sel0 = "spi2-rx-tx",
43 		.name_sel1 = "ssp1-rx",
48 		.signal = 10,
49 		.name_sel0 = "uart7-rx",
50 		.name_sel1 = "i2s1-dma1",
55 		.signal = 11,
56 		.name_sel0 = "spi1-rx-tx",
57 		.name_sel1 = "ssp1-tx",
62 		.signal = 14,
64 		.name_sel1 = "ssp0-rx",
69 		.signal = 15,
71 		.name_sel1 = "ssp0-tx",
82 	dev_dbg(dev, "releasing dma request signal %d routed to %s\n",  in lpc32xx_dmamux_release()
83 		mux->signal, mux->muxval ? mux->name_sel1 : mux->name_sel1);  in lpc32xx_dmamux_release()
85 	guard(spinlock)(&dmamux->lock);  in lpc32xx_dmamux_release()
87 	mux->busy = false;  in lpc32xx_dmamux_release()
93 	struct platform_device *pdev = of_find_device_by_node(ofdma->of_node);  in lpc32xx_dmamux_reserve()
94 	struct device *dev = &pdev->dev;  in lpc32xx_dmamux_reserve()
100 	if (dma_spec->args_count != 3) {  in lpc32xx_dmamux_reserve()
101 		dev_err(&pdev->dev, "invalid number of dma mux args\n");  in lpc32xx_dmamux_reserve()
102 		return ERR_PTR(-EINVAL);  in lpc32xx_dmamux_reserve()
106 		if (lpc32xx_muxes[i].signal == dma_spec->args[0]) {  in lpc32xx_dmamux_reserve()
112 		dev_err(&pdev->dev, "invalid mux request number: %d\n",  in lpc32xx_dmamux_reserve()
113 			dma_spec->args[0]);  in lpc32xx_dmamux_reserve()
114 		return ERR_PTR(-EINVAL);  in lpc32xx_dmamux_reserve()
117 	if (dma_spec->args[2] > 1) {  in lpc32xx_dmamux_reserve()
118 		dev_err(&pdev->dev, "invalid dma mux value: %d\n",  in lpc32xx_dmamux_reserve()
119 			dma_spec->args[1]);  in lpc32xx_dmamux_reserve()
120 		return ERR_PTR(-EINVAL);  in lpc32xx_dmamux_reserve()
124 	dma_spec->np = of_parse_phandle(ofdma->of_node, "dma-masters", 0);  in lpc32xx_dmamux_reserve()
125 	if (!dma_spec->np) {  in lpc32xx_dmamux_reserve()
126 		dev_err(&pdev->dev, "can't get dma master\n");  in lpc32xx_dmamux_reserve()
127 		return ERR_PTR(-EINVAL);  in lpc32xx_dmamux_reserve()
130 	spin_lock_irqsave(&dmamux->lock, flags);  in lpc32xx_dmamux_reserve()
131 	if (mux->busy) {  in lpc32xx_dmamux_reserve()
132 		spin_unlock_irqrestore(&dmamux->lock, flags);  in lpc32xx_dmamux_reserve()
133 		dev_err(dev, "dma request signal %d busy, routed to %s\n",  in lpc32xx_dmamux_reserve()
134 			mux->signal, mux->muxval ? mux->name_sel1 : mux->name_sel1);  in lpc32xx_dmamux_reserve()
135 		of_node_put(dma_spec->np);  in lpc32xx_dmamux_reserve()
136 		return ERR_PTR(-EBUSY);  in lpc32xx_dmamux_reserve()
139 	mux->busy = true;  in lpc32xx_dmamux_reserve()
140 	mux->muxval = dma_spec->args[2] ? BIT(mux->bit) : 0;  in lpc32xx_dmamux_reserve()
142 	regmap_update_bits(dmamux->reg, mux->muxreg, BIT(mux->bit), mux->muxval);  in lpc32xx_dmamux_reserve()
143 	spin_unlock_irqrestore(&dmamux->lock, flags);  in lpc32xx_dmamux_reserve()
145 	dma_spec->args[2] = 0;  in lpc32xx_dmamux_reserve()
146 	dma_spec->args_count = 2;  in lpc32xx_dmamux_reserve()
148 	dev_dbg(dev, "dma request signal %d routed to %s\n",  in lpc32xx_dmamux_reserve()
149 		mux->signal, mux->muxval ? mux->name_sel1 : mux->name_sel1);  in lpc32xx_dmamux_reserve()
156 	struct device_node *np = pdev->dev.of_node;  in lpc32xx_dmamux_probe()
159 	dmamux = devm_kzalloc(&pdev->dev, sizeof(*dmamux), GFP_KERNEL);  in lpc32xx_dmamux_probe()
161 		return -ENOMEM;  in lpc32xx_dmamux_probe()
163 	dmamux->reg = syscon_node_to_regmap(np->parent);  in lpc32xx_dmamux_probe()
164 	if (IS_ERR(dmamux->reg)) {  in lpc32xx_dmamux_probe()
165 		dev_err(&pdev->dev, "syscon lookup failed\n");  in lpc32xx_dmamux_probe()
166 		return PTR_ERR(dmamux->reg);  in lpc32xx_dmamux_probe()
169 	spin_lock_init(&dmamux->lock);  in lpc32xx_dmamux_probe()
171 	dmamux->dmarouter.dev = &pdev->dev;  in lpc32xx_dmamux_probe()
172 	dmamux->dmarouter.route_free = lpc32xx_dmamux_release;  in lpc32xx_dmamux_probe()
175 				      &dmamux->dmarouter);  in lpc32xx_dmamux_probe()
179 	{ .compatible = "nxp,lpc3220-dmamux" },
186 		.name = "lpc32xx-dmamux",