1 // SPDX-License-Identifier: GPL-2.0-only
2 /* 10G controller driver for Samsung SoCs
3  *
4  * Copyright (C) 2013 Samsung Electronics Co., Ltd.
5  *		http://www.samsung.com
6  *
7  * Author: Siva Reddy Kallam <siva.kallam@samsung.com>
8  */
9 
10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11 
12 #include <linux/etherdevice.h>
13 #include <linux/io.h>
14 #include <linux/module.h>
15 #include <linux/netdevice.h>
16 #include <linux/of.h>
17 #include <linux/of_irq.h>
18 #include <linux/of_net.h>
19 #include <linux/phy.h>
20 #include <linux/platform_device.h>
21 #include <linux/sxgbe_platform.h>
22 
23 #include "sxgbe_common.h"
24 #include "sxgbe_reg.h"
25 
26 #ifdef CONFIG_OF
27 static int sxgbe_probe_config_dt(struct platform_device *pdev,
28 				 struct sxgbe_plat_data *plat)
29 {
30 	struct device_node *np = pdev->dev.of_node;
31 	struct sxgbe_dma_cfg *dma_cfg;
32 	int err;
33 
34 	if (!np)
35 		return -ENODEV;
36 
37 	err = of_get_phy_mode(np, &plat->interface);
38 	if (err && err != -ENODEV)
39 		return err;
40 
41 	plat->bus_id = of_alias_get_id(np, "ethernet");
42 	if (plat->bus_id < 0)
43 		plat->bus_id = 0;
44 
45 	plat->mdio_bus_data = devm_kzalloc(&pdev->dev,
46 					   sizeof(*plat->mdio_bus_data),
47 					   GFP_KERNEL);
48 	if (!plat->mdio_bus_data)
49 		return -ENOMEM;
50 
51 	dma_cfg = devm_kzalloc(&pdev->dev, sizeof(*dma_cfg), GFP_KERNEL);
52 	if (!dma_cfg)
53 		return -ENOMEM;
54 
55 	plat->dma_cfg = dma_cfg;
56 	of_property_read_u32(np, "samsung,pbl", &dma_cfg->pbl);
57 	if (of_property_read_u32(np, "samsung,burst-map", &dma_cfg->burst_map) == 0)
58 		dma_cfg->fixed_burst = true;
59 
60 	return 0;
61 }
62 #else
63 static int sxgbe_probe_config_dt(struct platform_device *pdev,
64 				 struct sxgbe_plat_data *plat)
65 {
66 	return -ENOSYS;
67 }
68 #endif /* CONFIG_OF */
69 
70 /**
71  * sxgbe_platform_probe
72  * @pdev: platform device pointer
73  * Description: platform_device probe function. It allocates
74  * the necessary resources and invokes the main to init
75  * the net device, register the mdio bus etc.
76  */
77 static int sxgbe_platform_probe(struct platform_device *pdev)
78 {
79 	int ret;
80 	int i, chan;
81 	struct device *dev = &pdev->dev;
82 	void __iomem *addr;
83 	struct sxgbe_priv_data *priv = NULL;
84 	struct sxgbe_plat_data *plat_dat = NULL;
85 	struct net_device *ndev = platform_get_drvdata(pdev);
86 	struct device_node *node = dev->of_node;
87 
88 	/* Get memory resource */
89 	addr = devm_platform_ioremap_resource(pdev, 0);
90 	if (IS_ERR(addr))
91 		return PTR_ERR(addr);
92 
93 	if (pdev->dev.of_node) {
94 		plat_dat = devm_kzalloc(&pdev->dev,
95 					sizeof(struct sxgbe_plat_data),
96 					GFP_KERNEL);
97 		if (!plat_dat)
98 			return  -ENOMEM;
99 
100 		ret = sxgbe_probe_config_dt(pdev, plat_dat);
101 		if (ret) {
102 			pr_err("%s: main dt probe failed\n", __func__);
103 			return ret;
104 		}
105 	}
106 
107 	priv = sxgbe_drv_probe(&(pdev->dev), plat_dat, addr);
108 	if (!priv) {
109 		pr_err("%s: main driver probe failed\n", __func__);
110 		goto err_out;
111 	}
112 
113 	/* Get the SXGBE common INT information */
114 	priv->irq  = irq_of_parse_and_map(node, 0);
115 	if (priv->irq <= 0) {
116 		dev_err(dev, "sxgbe common irq parsing failed\n");
117 		goto err_drv_remove;
118 	}
119 
120 	/* Get MAC address if available (DT) */
121 	of_get_ethdev_address(node, priv->dev);
122 
123 	/* Get the TX/RX IRQ numbers */
124 	for (i = 0, chan = 1; i < SXGBE_TX_QUEUES; i++) {
125 		priv->txq[i]->irq_no = irq_of_parse_and_map(node, chan++);
126 		if (priv->txq[i]->irq_no <= 0) {
127 			dev_err(dev, "sxgbe tx irq parsing failed\n");
128 			goto err_tx_irq_unmap;
129 		}
130 	}
131 
132 	for (i = 0; i < SXGBE_RX_QUEUES; i++) {
133 		priv->rxq[i]->irq_no = irq_of_parse_and_map(node, chan++);
134 		if (priv->rxq[i]->irq_no <= 0) {
135 			dev_err(dev, "sxgbe rx irq parsing failed\n");
136 			goto err_rx_irq_unmap;
137 		}
138 	}
139 
140 	priv->lpi_irq = irq_of_parse_and_map(node, chan);
141 	if (priv->lpi_irq <= 0) {
142 		dev_err(dev, "sxgbe lpi irq parsing failed\n");
143 		goto err_rx_irq_unmap;
144 	}
145 
146 	platform_set_drvdata(pdev, priv->dev);
147 
148 	pr_debug("platform driver registration completed\n");
149 
150 	return 0;
151 
152 err_rx_irq_unmap:
153 	while (i--)
154 		irq_dispose_mapping(priv->rxq[i]->irq_no);
155 	i = SXGBE_TX_QUEUES;
156 err_tx_irq_unmap:
157 	while (i--)
158 		irq_dispose_mapping(priv->txq[i]->irq_no);
159 	irq_dispose_mapping(priv->irq);
160 err_drv_remove:
161 	sxgbe_drv_remove(ndev);
162 err_out:
163 	return -ENODEV;
164 }
165 
166 /**
167  * sxgbe_platform_remove
168  * @pdev: platform device pointer
169  * Description: this function calls the main to free the net resources
170  * and calls the platforms hook and release the resources (e.g. mem).
171  */
172 static int sxgbe_platform_remove(struct platform_device *pdev)
173 {
174 	struct net_device *ndev = platform_get_drvdata(pdev);
175 
176 	sxgbe_drv_remove(ndev);
177 
178 	return 0;
179 }
180 
181 #ifdef CONFIG_PM
182 static int sxgbe_platform_suspend(struct device *dev)
183 {
184 	struct net_device *ndev = dev_get_drvdata(dev);
185 
186 	return sxgbe_suspend(ndev);
187 }
188 
189 static int sxgbe_platform_resume(struct device *dev)
190 {
191 	struct net_device *ndev = dev_get_drvdata(dev);
192 
193 	return sxgbe_resume(ndev);
194 }
195 
196 static int sxgbe_platform_freeze(struct device *dev)
197 {
198 	struct net_device *ndev = dev_get_drvdata(dev);
199 
200 	return sxgbe_freeze(ndev);
201 }
202 
203 static int sxgbe_platform_restore(struct device *dev)
204 {
205 	struct net_device *ndev = dev_get_drvdata(dev);
206 
207 	return sxgbe_restore(ndev);
208 }
209 
210 static const struct dev_pm_ops sxgbe_platform_pm_ops = {
211 	.suspend	= sxgbe_platform_suspend,
212 	.resume		= sxgbe_platform_resume,
213 	.freeze		= sxgbe_platform_freeze,
214 	.thaw		= sxgbe_platform_restore,
215 	.restore	= sxgbe_platform_restore,
216 };
217 #else
218 static const struct dev_pm_ops sxgbe_platform_pm_ops;
219 #endif /* CONFIG_PM */
220 
221 static const struct of_device_id sxgbe_dt_ids[] = {
222 	{ .compatible = "samsung,sxgbe-v2.0a"},
223 	{ /* sentinel */ }
224 };
225 MODULE_DEVICE_TABLE(of, sxgbe_dt_ids);
226 
227 static struct platform_driver sxgbe_platform_driver = {
228 	.probe	= sxgbe_platform_probe,
229 	.remove	= sxgbe_platform_remove,
230 	.driver	= {
231 		.name		= SXGBE_RESOURCE_NAME,
232 		.pm		= &sxgbe_platform_pm_ops,
233 		.of_match_table	= sxgbe_dt_ids,
234 	},
235 };
236 
237 int sxgbe_register_platform(void)
238 {
239 	int err;
240 
241 	err = platform_driver_register(&sxgbe_platform_driver);
242 	if (err)
243 		pr_err("failed to register the platform driver\n");
244 
245 	return err;
246 }
247 
248 void sxgbe_unregister_platform(void)
249 {
250 	platform_driver_unregister(&sxgbe_platform_driver);
251 }
252