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 	bool mdio = false;
55 
56 	np = dev_of_node(&pdev->dev);
57 
58 	if (!np) {
59 		pr_info("dwmac_loongson_pci: No OF node\n");
60 		return -ENODEV;
61 	}
62 
63 	if (!of_device_is_compatible(np, "loongson, pci-gmac")) {
64 		pr_info("dwmac_loongson_pci: Incompatible OF node\n");
65 		return -ENODEV;
66 	}
67 
68 	plat = devm_kzalloc(&pdev->dev, sizeof(*plat), GFP_KERNEL);
69 	if (!plat)
70 		return -ENOMEM;
71 
72 	if (plat->mdio_node) {
73 		dev_err(&pdev->dev, "Found MDIO subnode\n");
74 		mdio = true;
75 	}
76 
77 	if (mdio) {
78 		plat->mdio_bus_data = devm_kzalloc(&pdev->dev,
79 						   sizeof(*plat->mdio_bus_data),
80 						   GFP_KERNEL);
81 		if (!plat->mdio_bus_data)
82 			return -ENOMEM;
83 		plat->mdio_bus_data->needs_reset = true;
84 	}
85 
86 	plat->dma_cfg = devm_kzalloc(&pdev->dev, sizeof(*plat->dma_cfg), GFP_KERNEL);
87 	if (!plat->dma_cfg)
88 		return -ENOMEM;
89 
90 	/* Enable pci device */
91 	ret = pci_enable_device(pdev);
92 	if (ret) {
93 		dev_err(&pdev->dev, "%s: ERROR: failed to enable device\n", __func__);
94 		return ret;
95 	}
96 
97 	/* Get the base address of device */
98 	for (i = 0; i < PCI_STD_NUM_BARS; i++) {
99 		if (pci_resource_len(pdev, i) == 0)
100 			continue;
101 		ret = pcim_iomap_regions(pdev, BIT(0), pci_name(pdev));
102 		if (ret)
103 			return ret;
104 		break;
105 	}
106 
107 	plat->bus_id = of_alias_get_id(np, "ethernet");
108 	if (plat->bus_id < 0)
109 		plat->bus_id = pci_dev_id(pdev);
110 
111 	phy_mode = device_get_phy_mode(&pdev->dev);
112 	if (phy_mode < 0) {
113 		dev_err(&pdev->dev, "phy_mode not found\n");
114 		return phy_mode;
115 	}
116 
117 	plat->phy_interface = phy_mode;
118 	plat->interface = PHY_INTERFACE_MODE_GMII;
119 
120 	pci_set_master(pdev);
121 
122 	loongson_default_data(plat);
123 	pci_enable_msi(pdev);
124 	memset(&res, 0, sizeof(res));
125 	res.addr = pcim_iomap_table(pdev)[0];
126 
127 	res.irq = of_irq_get_byname(np, "macirq");
128 	if (res.irq < 0) {
129 		dev_err(&pdev->dev, "IRQ macirq not found\n");
130 		ret = -ENODEV;
131 	}
132 
133 	res.wol_irq = of_irq_get_byname(np, "eth_wake_irq");
134 	if (res.wol_irq < 0) {
135 		dev_info(&pdev->dev, "IRQ eth_wake_irq not found, using macirq\n");
136 		res.wol_irq = res.irq;
137 	}
138 
139 	res.lpi_irq = of_irq_get_byname(np, "eth_lpi");
140 	if (res.lpi_irq < 0) {
141 		dev_err(&pdev->dev, "IRQ eth_lpi not found\n");
142 		ret = -ENODEV;
143 	}
144 
145 	return stmmac_dvr_probe(&pdev->dev, plat, &res);
146 }
147 
148 static void loongson_dwmac_remove(struct pci_dev *pdev)
149 {
150 	int i;
151 
152 	stmmac_dvr_remove(&pdev->dev);
153 
154 	for (i = 0; i < PCI_STD_NUM_BARS; i++) {
155 		if (pci_resource_len(pdev, i) == 0)
156 			continue;
157 		pcim_iounmap_regions(pdev, BIT(i));
158 		break;
159 	}
160 
161 	pci_disable_device(pdev);
162 }
163 
164 static int __maybe_unused loongson_dwmac_suspend(struct device *dev)
165 {
166 	struct pci_dev *pdev = to_pci_dev(dev);
167 	int ret;
168 
169 	ret = stmmac_suspend(dev);
170 	if (ret)
171 		return ret;
172 
173 	ret = pci_save_state(pdev);
174 	if (ret)
175 		return ret;
176 
177 	pci_disable_device(pdev);
178 	pci_wake_from_d3(pdev, true);
179 	return 0;
180 }
181 
182 static int __maybe_unused loongson_dwmac_resume(struct device *dev)
183 {
184 	struct pci_dev *pdev = to_pci_dev(dev);
185 	int ret;
186 
187 	pci_restore_state(pdev);
188 	pci_set_power_state(pdev, PCI_D0);
189 
190 	ret = pci_enable_device(pdev);
191 	if (ret)
192 		return ret;
193 
194 	pci_set_master(pdev);
195 
196 	return stmmac_resume(dev);
197 }
198 
199 static SIMPLE_DEV_PM_OPS(loongson_dwmac_pm_ops, loongson_dwmac_suspend,
200 			 loongson_dwmac_resume);
201 
202 static const struct pci_device_id loongson_dwmac_id_table[] = {
203 	{ PCI_VDEVICE(LOONGSON, 0x7a03) },
204 	{}
205 };
206 MODULE_DEVICE_TABLE(pci, loongson_dwmac_id_table);
207 
208 struct pci_driver loongson_dwmac_driver = {
209 	.name = "dwmac-loongson-pci",
210 	.id_table = loongson_dwmac_id_table,
211 	.probe = loongson_dwmac_probe,
212 	.remove = loongson_dwmac_remove,
213 	.driver = {
214 		.pm = &loongson_dwmac_pm_ops,
215 	},
216 };
217 
218 module_pci_driver(loongson_dwmac_driver);
219 
220 MODULE_DESCRIPTION("Loongson DWMAC PCI driver");
221 MODULE_AUTHOR("Qing Zhang <zhangqing@loongson.cn>");
222 MODULE_LICENSE("GPL v2");
223