1 // SPDX-License-Identifier: GPL-2.0
3 // Copyright (C) 2019 Texas Instruments Incorporated - https://www.ti.com/
7 #include <linux/dma-direction.h>
8 #include <linux/dma-mapping.h>
40 	struct map_info *map = &hbdev->map;  in am654_hbmc_calibrate()
51 	while (count--) {  in am654_hbmc_calibrate()
70 	complete(&priv->rx_dma_complete);  in am654_hbmc_dma_callback()
78 	struct dma_chan *rx_chan = priv->rx_chan;  in am654_hbmc_dma_read()
84 	if (!priv->rx_chan || !virt_addr_valid(to) || object_is_on_stack(to))  in am654_hbmc_dma_read()
85 		return -EINVAL;  in am654_hbmc_dma_read()
87 	dma_dst = dma_map_single(rx_chan->device->dev, to, len, DMA_FROM_DEVICE);  in am654_hbmc_dma_read()
88 	if (dma_mapping_error(rx_chan->device->dev, dma_dst)) {  in am654_hbmc_dma_read()
89 		dev_dbg(priv->ctlr->dev, "DMA mapping failed\n");  in am654_hbmc_dma_read()
90 		return -EIO;  in am654_hbmc_dma_read()
93 	dma_src = priv->device_base + from;  in am654_hbmc_dma_read()
96 		dev_err(priv->ctlr->dev, "device_prep_dma_memcpy error\n");  in am654_hbmc_dma_read()
97 		ret = -EIO;  in am654_hbmc_dma_read()
101 	reinit_completion(&priv->rx_dma_complete);  in am654_hbmc_dma_read()
102 	tx->callback = am654_hbmc_dma_callback;  in am654_hbmc_dma_read()
103 	tx->callback_param = priv;  in am654_hbmc_dma_read()
108 		dev_err(priv->ctlr->dev, "dma_submit_error %d\n", cookie);  in am654_hbmc_dma_read()
113 	if (!wait_for_completion_timeout(&priv->rx_dma_complete,  msecs_to_jiffies(len + 1000))) {  in am654_hbmc_dma_read()
115 		dev_err(priv->ctlr->dev, "DMA wait_for_completion_timeout\n");  in am654_hbmc_dma_read()
116 		ret = -ETIMEDOUT;  in am654_hbmc_dma_read()
120 	dma_unmap_single(rx_chan->device->dev, dma_dst, len, DMA_FROM_DEVICE);  in am654_hbmc_dma_read()
127 	struct am654_hbmc_device_priv *priv = hbdev->priv;  in am654_hbmc_read()
130 		memcpy_fromio(to, hbdev->map.virt + from, len);  in am654_hbmc_read()
148 		if (PTR_ERR(rx_chan) == -EPROBE_DEFER)  in am654_hbmc_request_mmap_dma()
149 			return -EPROBE_DEFER;  in am654_hbmc_request_mmap_dma()
150 		dev_dbg(priv->ctlr->dev, "No DMA channel available\n");  in am654_hbmc_request_mmap_dma()
153 	priv->rx_chan = rx_chan;  in am654_hbmc_request_mmap_dma()
154 	init_completion(&priv->rx_dma_complete);  in am654_hbmc_request_mmap_dma()
161 	struct device_node *np = pdev->dev.of_node;  in am654_hbmc_probe()
163 	struct device *dev = &pdev->dev;  in am654_hbmc_probe()
170 		return -ENOMEM;  in am654_hbmc_probe()
174 	priv->hbdev.np = of_get_next_child(np, NULL);  in am654_hbmc_probe()
175 	ret = of_address_to_resource(priv->hbdev.np, 0, &res);  in am654_hbmc_probe()
179 	if (of_property_read_bool(dev->of_node, "mux-controls")) {  in am654_hbmc_probe()
187 			dev_err(dev, "Failed to select HBMC mux\n");  in am654_hbmc_probe()
190 		priv->mux_ctrl = control;  in am654_hbmc_probe()
193 	priv->hbdev.map.size = resource_size(&res);  in am654_hbmc_probe()
194 	priv->hbdev.map.virt = devm_ioremap_resource(dev, &res);  in am654_hbmc_probe()
195 	if (IS_ERR(priv->hbdev.map.virt))  in am654_hbmc_probe()
196 		return PTR_ERR(priv->hbdev.map.virt);  in am654_hbmc_probe()
198 	priv->ctlr.dev = dev;  in am654_hbmc_probe()
199 	priv->ctlr.ops = &am654_hbmc_ops;  in am654_hbmc_probe()
200 	priv->hbdev.ctlr = &priv->ctlr;  in am654_hbmc_probe()
204 		ret = -ENOMEM;  in am654_hbmc_probe()
208 	priv->hbdev.priv = dev_priv;  in am654_hbmc_probe()
209 	dev_priv->device_base = res.start;  in am654_hbmc_probe()
210 	dev_priv->ctlr = &priv->ctlr;  in am654_hbmc_probe()
216 	ret = hyperbus_register_device(&priv->hbdev);  in am654_hbmc_probe()
224 	if (dev_priv->rx_chan)  in am654_hbmc_probe()
225 		dma_release_channel(dev_priv->rx_chan);  in am654_hbmc_probe()
227 	if (priv->mux_ctrl)  in am654_hbmc_probe()
228 		mux_control_deselect(priv->mux_ctrl);  in am654_hbmc_probe()
235 	struct am654_hbmc_device_priv *dev_priv = priv->hbdev.priv;  in am654_hbmc_remove()
237 	hyperbus_unregister_device(&priv->hbdev);  in am654_hbmc_remove()
239 	if (priv->mux_ctrl)  in am654_hbmc_remove()
240 		mux_control_deselect(priv->mux_ctrl);  in am654_hbmc_remove()
242 	if (dev_priv->rx_chan)  in am654_hbmc_remove()
243 		dma_release_channel(dev_priv->rx_chan);  in am654_hbmc_remove()
248 		.compatible = "ti,am654-hbmc",
259 		.name = "hbmc-am654",
266 MODULE_DESCRIPTION("HBMC driver for AM654 SoC");
268 MODULE_ALIAS("platform:hbmc-am654");