2  * DMA Router driver for LPC18xx/43xx DMA MUX
6  * Based on TI DMA Crossbar driver by:
7  *   Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com
50 	spin_lock_irqsave(&dmamux->lock, flags);  in lpc18xx_dmamux_free()
51 	mux->busy = false;  in lpc18xx_dmamux_free()
52 	spin_unlock_irqrestore(&dmamux->lock, flags);  in lpc18xx_dmamux_free()
58 	struct platform_device *pdev = of_find_device_by_node(ofdma->of_node);  in lpc18xx_dmamux_reserve()
63 	if (dma_spec->args_count != 3) {  in lpc18xx_dmamux_reserve()
64 		dev_err(&pdev->dev, "invalid number of dma mux args\n");  in lpc18xx_dmamux_reserve()
65 		return ERR_PTR(-EINVAL);  in lpc18xx_dmamux_reserve()
68 	mux = dma_spec->args[0];  in lpc18xx_dmamux_reserve()
69 	if (mux >= dmamux->dma_master_requests) {  in lpc18xx_dmamux_reserve()
70 		dev_err(&pdev->dev, "invalid mux number: %d\n",  in lpc18xx_dmamux_reserve()
71 			dma_spec->args[0]);  in lpc18xx_dmamux_reserve()
72 		return ERR_PTR(-EINVAL);  in lpc18xx_dmamux_reserve()
75 	if (dma_spec->args[1] > LPC18XX_DMAMUX_MAX_VAL) {  in lpc18xx_dmamux_reserve()
76 		dev_err(&pdev->dev, "invalid dma mux value: %d\n",  in lpc18xx_dmamux_reserve()
77 			dma_spec->args[1]);  in lpc18xx_dmamux_reserve()
78 		return ERR_PTR(-EINVAL);  in lpc18xx_dmamux_reserve()
82 	dma_spec->np = of_parse_phandle(ofdma->of_node, "dma-masters", 0);  in lpc18xx_dmamux_reserve()
83 	if (!dma_spec->np) {  in lpc18xx_dmamux_reserve()
84 		dev_err(&pdev->dev, "can't get dma master\n");  in lpc18xx_dmamux_reserve()
85 		return ERR_PTR(-EINVAL);  in lpc18xx_dmamux_reserve()
88 	spin_lock_irqsave(&dmamux->lock, flags);  in lpc18xx_dmamux_reserve()
89 	if (dmamux->muxes[mux].busy) {  in lpc18xx_dmamux_reserve()
90 		spin_unlock_irqrestore(&dmamux->lock, flags);  in lpc18xx_dmamux_reserve()
91 		dev_err(&pdev->dev, "dma request %u busy with %u.%u\n",  in lpc18xx_dmamux_reserve()
92 			mux, mux, dmamux->muxes[mux].value);  in lpc18xx_dmamux_reserve()
93 		of_node_put(dma_spec->np);  in lpc18xx_dmamux_reserve()
94 		return ERR_PTR(-EBUSY);  in lpc18xx_dmamux_reserve()
97 	dmamux->muxes[mux].busy = true;  in lpc18xx_dmamux_reserve()
98 	dmamux->muxes[mux].value = dma_spec->args[1];  in lpc18xx_dmamux_reserve()
100 	regmap_update_bits(dmamux->reg, LPC18XX_CREG_DMAMUX,  in lpc18xx_dmamux_reserve()
102 			   LPC18XX_DMAMUX_VAL(dmamux->muxes[mux].value, mux));  in lpc18xx_dmamux_reserve()
103 	spin_unlock_irqrestore(&dmamux->lock, flags);  in lpc18xx_dmamux_reserve()
105 	dma_spec->args[1] = dma_spec->args[2];  in lpc18xx_dmamux_reserve()
106 	dma_spec->args_count = 2;  in lpc18xx_dmamux_reserve()
108 	dev_dbg(&pdev->dev, "mapping dmamux %u.%u to dma request %u\n", mux,  in lpc18xx_dmamux_reserve()
109 		dmamux->muxes[mux].value, mux);  in lpc18xx_dmamux_reserve()
111 	return &dmamux->muxes[mux];  in lpc18xx_dmamux_reserve()
116 	struct device_node *dma_np, *np = pdev->dev.of_node;  in lpc18xx_dmamux_probe()
120 	dmamux = devm_kzalloc(&pdev->dev, sizeof(*dmamux), GFP_KERNEL);  in lpc18xx_dmamux_probe()
122 		return -ENOMEM;  in lpc18xx_dmamux_probe()
124 	dmamux->reg = syscon_regmap_lookup_by_compatible("nxp,lpc1850-creg");  in lpc18xx_dmamux_probe()
125 	if (IS_ERR(dmamux->reg)) {  in lpc18xx_dmamux_probe()
126 		dev_err(&pdev->dev, "syscon lookup failed\n");  in lpc18xx_dmamux_probe()
127 		return PTR_ERR(dmamux->reg);  in lpc18xx_dmamux_probe()
130 	ret = of_property_read_u32(np, "dma-requests",  in lpc18xx_dmamux_probe()
131 				   &dmamux->dma_mux_requests);  in lpc18xx_dmamux_probe()
133 		dev_err(&pdev->dev, "missing dma-requests property\n");  in lpc18xx_dmamux_probe()
137 	dma_np = of_parse_phandle(np, "dma-masters", 0);  in lpc18xx_dmamux_probe()
139 		dev_err(&pdev->dev, "can't get dma master\n");  in lpc18xx_dmamux_probe()
140 		return -ENODEV;  in lpc18xx_dmamux_probe()
143 	ret = of_property_read_u32(dma_np, "dma-requests",  in lpc18xx_dmamux_probe()
144 				   &dmamux->dma_master_requests);  in lpc18xx_dmamux_probe()
147 		dev_err(&pdev->dev, "missing master dma-requests property\n");  in lpc18xx_dmamux_probe()
151 	dmamux->muxes = devm_kcalloc(&pdev->dev, dmamux->dma_master_requests,  in lpc18xx_dmamux_probe()
154 	if (!dmamux->muxes)  in lpc18xx_dmamux_probe()
155 		return -ENOMEM;  in lpc18xx_dmamux_probe()
157 	spin_lock_init(&dmamux->lock);  in lpc18xx_dmamux_probe()
159 	dmamux->dmarouter.dev = &pdev->dev;  in lpc18xx_dmamux_probe()
160 	dmamux->dmarouter.route_free = lpc18xx_dmamux_free;  in lpc18xx_dmamux_probe()
163 				      &dmamux->dmarouter);  in lpc18xx_dmamux_probe()
167 	{ .compatible = "nxp,lpc1850-dmamux" },
174 		.name = "lpc18xx-dmamux",