1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2020, Loongson Corporation
3  */
4 
5 #include <linux/clk-provider.h>
6 #include <linux/pci.h>
7 #include <linux/dmi.h>
8 #include <linux/device.h>
9 #include <linux/of_irq.h>
10 #include "stmmac.h"
11 
12 static int loongson_default_data(struct plat_stmmacenet_data *plat)
13 {
14 	plat->clk_csr = 2;	/* clk_csr_i = 20-35MHz & MDC = clk_csr_i/16 */
15 	plat->has_gmac = 1;
16 	plat->force_sf_dma_mode = 1;
17 
18 	/* Set default value for multicast hash bins */
19 	plat->multicast_filter_bins = HASH_TABLE_SIZE;
20 
21 	/* Set default value for unicast filter entries */
22 	plat->unicast_filter_entries = 1;
23 
24 	/* Set the maxmtu to a default of JUMBO_LEN */
25 	plat->maxmtu = JUMBO_LEN;
26 
27 	/* Set default number of RX and TX queues to use */
28 	plat->tx_queues_to_use = 1;
29 	plat->rx_queues_to_use = 1;
30 
31 	/* Disable Priority config by default */
32 	plat->tx_queues_cfg[0].use_prio = false;
33 	plat->rx_queues_cfg[0].use_prio = false;
34 
35 	/* Disable RX queues routing by default */
36 	plat->rx_queues_cfg[0].pkt_route = 0x0;
37 
38 	/* Default to phy auto-detection */
39 	plat->phy_addr = -1;
40 
41 	plat->dma_cfg->pbl = 32;
42 	plat->dma_cfg->pblx8 = true;
43 
44 	plat->multicast_filter_bins = 256;
45 	return 0;
46 }
47 
48 static int loongson_dwmac_probe(struct pci_dev *pdev, const struct pci_device_id *id)
49 {
50 	struct plat_stmmacenet_data *plat;
51 	struct stmmac_resources res;
52 	struct device_node *np;
53 	int ret, i, phy_mode;
54 
55 	np = dev_of_node(&pdev->dev);
56 
57 	if (!np) {
58 		pr_info("dwmac_loongson_pci: No OF node\n");
59 		return -ENODEV;
60 	}
61 
62 	plat = devm_kzalloc(&pdev->dev, sizeof(*plat), GFP_KERNEL);
63 	if (!plat)
64 		return -ENOMEM;
65 
66 	plat->mdio_bus_data = devm_kzalloc(&pdev->dev,
67 					   sizeof(*plat->mdio_bus_data),
68 					   GFP_KERNEL);
69 	if (!plat->mdio_bus_data)
70 		return -ENOMEM;
71 
72 	plat->mdio_node = of_get_child_by_name(np, "mdio");
73 	if (plat->mdio_node) {
74 		dev_info(&pdev->dev, "Found MDIO subnode\n");
75 		plat->mdio_bus_data->needs_reset = true;
76 	}
77 
78 	plat->dma_cfg = devm_kzalloc(&pdev->dev, sizeof(*plat->dma_cfg), GFP_KERNEL);
79 	if (!plat->dma_cfg) {
80 		ret = -ENOMEM;
81 		goto err_put_node;
82 	}
83 
84 	/* Enable pci device */
85 	ret = pci_enable_device(pdev);
86 	if (ret) {
87 		dev_err(&pdev->dev, "%s: ERROR: failed to enable device\n", __func__);
88 		goto err_put_node;
89 	}
90 
91 	/* Get the base address of device */
92 	for (i = 0; i < PCI_STD_NUM_BARS; i++) {
93 		if (pci_resource_len(pdev, i) == 0)
94 			continue;
95 		ret = pcim_iomap_regions(pdev, BIT(0), pci_name(pdev));
96 		if (ret)
97 			goto err_disable_device;
98 		break;
99 	}
100 
101 	plat->bus_id = of_alias_get_id(np, "ethernet");
102 	if (plat->bus_id < 0)
103 		plat->bus_id = pci_dev_id(pdev);
104 
105 	phy_mode = device_get_phy_mode(&pdev->dev);
106 	if (phy_mode < 0) {
107 		dev_err(&pdev->dev, "phy_mode not found\n");
108 		ret = phy_mode;
109 		goto err_disable_device;
110 	}
111 
112 	plat->phy_interface = phy_mode;
113 	plat->mac_interface = PHY_INTERFACE_MODE_GMII;
114 
115 	pci_set_master(pdev);
116 
117 	loongson_default_data(plat);
118 	pci_enable_msi(pdev);
119 	memset(&res, 0, sizeof(res));
120 	res.addr = pcim_iomap_table(pdev)[0];
121 
122 	res.irq = of_irq_get_byname(np, "macirq");
123 	if (res.irq < 0) {
124 		dev_err(&pdev->dev, "IRQ macirq not found\n");
125 		ret = -ENODEV;
126 		goto err_disable_msi;
127 	}
128 
129 	res.wol_irq = of_irq_get_byname(np, "eth_wake_irq");
130 	if (res.wol_irq < 0) {
131 		dev_info(&pdev->dev, "IRQ eth_wake_irq not found, using macirq\n");
132 		res.wol_irq = res.irq;
133 	}
134 
135 	res.lpi_irq = of_irq_get_byname(np, "eth_lpi");
136 	if (res.lpi_irq < 0) {
137 		dev_err(&pdev->dev, "IRQ eth_lpi not found\n");
138 		ret = -ENODEV;
139 		goto err_disable_msi;
140 	}
141 
142 	ret = stmmac_dvr_probe(&pdev->dev, plat, &res);
143 	if (ret)
144 		goto err_disable_msi;
145 
146 	return ret;
147 
148 err_disable_msi:
149 	pci_disable_msi(pdev);
150 err_disable_device:
151 	pci_disable_device(pdev);
152 err_put_node:
153 	of_node_put(plat->mdio_node);
154 	return ret;
155 }
156 
157 static void loongson_dwmac_remove(struct pci_dev *pdev)
158 {
159 	struct net_device *ndev = dev_get_drvdata(&pdev->dev);
160 	struct stmmac_priv *priv = netdev_priv(ndev);
161 	int i;
162 
163 	of_node_put(priv->plat->mdio_node);
164 	stmmac_dvr_remove(&pdev->dev);
165 
166 	for (i = 0; i < PCI_STD_NUM_BARS; i++) {
167 		if (pci_resource_len(pdev, i) == 0)
168 			continue;
169 		pcim_iounmap_regions(pdev, BIT(i));
170 		break;
171 	}
172 
173 	pci_disable_msi(pdev);
174 	pci_disable_device(pdev);
175 }
176 
177 static int __maybe_unused loongson_dwmac_suspend(struct device *dev)
178 {
179 	struct pci_dev *pdev = to_pci_dev(dev);
180 	int ret;
181 
182 	ret = stmmac_suspend(dev);
183 	if (ret)
184 		return ret;
185 
186 	ret = pci_save_state(pdev);
187 	if (ret)
188 		return ret;
189 
190 	pci_disable_device(pdev);
191 	pci_wake_from_d3(pdev, true);
192 	return 0;
193 }
194 
195 static int __maybe_unused loongson_dwmac_resume(struct device *dev)
196 {
197 	struct pci_dev *pdev = to_pci_dev(dev);
198 	int ret;
199 
200 	pci_restore_state(pdev);
201 	pci_set_power_state(pdev, PCI_D0);
202 
203 	ret = pci_enable_device(pdev);
204 	if (ret)
205 		return ret;
206 
207 	pci_set_master(pdev);
208 
209 	return stmmac_resume(dev);
210 }
211 
212 static SIMPLE_DEV_PM_OPS(loongson_dwmac_pm_ops, loongson_dwmac_suspend,
213 			 loongson_dwmac_resume);
214 
215 static const struct pci_device_id loongson_dwmac_id_table[] = {
216 	{ PCI_VDEVICE(LOONGSON, 0x7a03) },
217 	{}
218 };
219 MODULE_DEVICE_TABLE(pci, loongson_dwmac_id_table);
220 
221 static struct pci_driver loongson_dwmac_driver = {
222 	.name = "dwmac-loongson-pci",
223 	.id_table = loongson_dwmac_id_table,
224 	.probe = loongson_dwmac_probe,
225 	.remove = loongson_dwmac_remove,
226 	.driver = {
227 		.pm = &loongson_dwmac_pm_ops,
228 	},
229 };
230 
231 module_pci_driver(loongson_dwmac_driver);
232 
233 MODULE_DESCRIPTION("Loongson DWMAC PCI driver");
234 MODULE_AUTHOR("Qing Zhang <zhangqing@loongson.cn>");
235 MODULE_LICENSE("GPL v2");
236