1
2
3
4
5
6
7
8
9#include <linux/clk.h>
10#include <linux/delay.h>
11#include <linux/gpio.h>
12#include <linux/interrupt.h>
13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <linux/of_device.h>
16#include <linux/pci.h>
17#include <linux/platform_device.h>
18#include <linux/resource.h>
19#include <linux/types.h>
20#include <linux/regmap.h>
21
22#include "pcie-designware.h"
23
24struct dw_plat_pcie {
25 struct dw_pcie *pci;
26 struct regmap *regmap;
27 enum dw_pcie_device_mode mode;
28};
29
30struct dw_plat_pcie_of_data {
31 enum dw_pcie_device_mode mode;
32};
33
34static const struct of_device_id dw_plat_pcie_of_match[];
35
36static int dw_plat_pcie_host_init(struct pcie_port *pp)
37{
38 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
39
40 dw_pcie_setup_rc(pp);
41 dw_pcie_wait_for_link(pci);
42
43 if (IS_ENABLED(CONFIG_PCI_MSI))
44 dw_pcie_msi_init(pp);
45
46 return 0;
47}
48
49static void dw_plat_set_num_vectors(struct pcie_port *pp)
50{
51 pp->num_vectors = MAX_MSI_IRQS;
52}
53
54static const struct dw_pcie_host_ops dw_plat_pcie_host_ops = {
55 .host_init = dw_plat_pcie_host_init,
56 .set_num_vectors = dw_plat_set_num_vectors,
57};
58
59static int dw_plat_pcie_establish_link(struct dw_pcie *pci)
60{
61 return 0;
62}
63
64static const struct dw_pcie_ops dw_pcie_ops = {
65 .start_link = dw_plat_pcie_establish_link,
66};
67
68static void dw_plat_pcie_ep_init(struct dw_pcie_ep *ep)
69{
70 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
71 enum pci_barno bar;
72
73 for (bar = 0; bar < PCI_STD_NUM_BARS; bar++)
74 dw_pcie_ep_reset_bar(pci, bar);
75}
76
77static int dw_plat_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
78 enum pci_epc_irq_type type,
79 u16 interrupt_num)
80{
81 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
82
83 switch (type) {
84 case PCI_EPC_IRQ_LEGACY:
85 return dw_pcie_ep_raise_legacy_irq(ep, func_no);
86 case PCI_EPC_IRQ_MSI:
87 return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num);
88 case PCI_EPC_IRQ_MSIX:
89 return dw_pcie_ep_raise_msix_irq(ep, func_no, interrupt_num);
90 default:
91 dev_err(pci->dev, "UNKNOWN IRQ type\n");
92 }
93
94 return 0;
95}
96
97static const struct pci_epc_features dw_plat_pcie_epc_features = {
98 .linkup_notifier = false,
99 .msi_capable = true,
100 .msix_capable = true,
101};
102
103static const struct pci_epc_features*
104dw_plat_pcie_get_features(struct dw_pcie_ep *ep)
105{
106 return &dw_plat_pcie_epc_features;
107}
108
109static const struct dw_pcie_ep_ops pcie_ep_ops = {
110 .ep_init = dw_plat_pcie_ep_init,
111 .raise_irq = dw_plat_pcie_ep_raise_irq,
112 .get_features = dw_plat_pcie_get_features,
113};
114
115static int dw_plat_add_pcie_port(struct dw_plat_pcie *dw_plat_pcie,
116 struct platform_device *pdev)
117{
118 struct dw_pcie *pci = dw_plat_pcie->pci;
119 struct pcie_port *pp = &pci->pp;
120 struct device *dev = &pdev->dev;
121 int ret;
122
123 pp->irq = platform_get_irq(pdev, 1);
124 if (pp->irq < 0)
125 return pp->irq;
126
127 if (IS_ENABLED(CONFIG_PCI_MSI)) {
128 pp->msi_irq = platform_get_irq(pdev, 0);
129 if (pp->msi_irq < 0)
130 return pp->msi_irq;
131 }
132
133 pp->ops = &dw_plat_pcie_host_ops;
134
135 ret = dw_pcie_host_init(pp);
136 if (ret) {
137 dev_err(dev, "Failed to initialize host\n");
138 return ret;
139 }
140
141 return 0;
142}
143
144static int dw_plat_add_pcie_ep(struct dw_plat_pcie *dw_plat_pcie,
145 struct platform_device *pdev)
146{
147 int ret;
148 struct dw_pcie_ep *ep;
149 struct resource *res;
150 struct device *dev = &pdev->dev;
151 struct dw_pcie *pci = dw_plat_pcie->pci;
152
153 ep = &pci->ep;
154 ep->ops = &pcie_ep_ops;
155
156 pci->dbi_base2 = devm_platform_ioremap_resource_byname(pdev, "dbi2");
157 if (IS_ERR(pci->dbi_base2))
158 return PTR_ERR(pci->dbi_base2);
159
160 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
161 if (!res)
162 return -EINVAL;
163
164 ep->phys_base = res->start;
165 ep->addr_size = resource_size(res);
166
167 ret = dw_pcie_ep_init(ep);
168 if (ret) {
169 dev_err(dev, "Failed to initialize endpoint\n");
170 return ret;
171 }
172 return 0;
173}
174
175static int dw_plat_pcie_probe(struct platform_device *pdev)
176{
177 struct device *dev = &pdev->dev;
178 struct dw_plat_pcie *dw_plat_pcie;
179 struct dw_pcie *pci;
180 struct resource *res;
181 int ret;
182 const struct of_device_id *match;
183 const struct dw_plat_pcie_of_data *data;
184 enum dw_pcie_device_mode mode;
185
186 match = of_match_device(dw_plat_pcie_of_match, dev);
187 if (!match)
188 return -EINVAL;
189
190 data = (struct dw_plat_pcie_of_data *)match->data;
191 mode = (enum dw_pcie_device_mode)data->mode;
192
193 dw_plat_pcie = devm_kzalloc(dev, sizeof(*dw_plat_pcie), GFP_KERNEL);
194 if (!dw_plat_pcie)
195 return -ENOMEM;
196
197 pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
198 if (!pci)
199 return -ENOMEM;
200
201 pci->dev = dev;
202 pci->ops = &dw_pcie_ops;
203
204 dw_plat_pcie->pci = pci;
205 dw_plat_pcie->mode = mode;
206
207 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
208 if (!res)
209 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
210
211 pci->dbi_base = devm_ioremap_resource(dev, res);
212 if (IS_ERR(pci->dbi_base))
213 return PTR_ERR(pci->dbi_base);
214
215 platform_set_drvdata(pdev, dw_plat_pcie);
216
217 switch (dw_plat_pcie->mode) {
218 case DW_PCIE_RC_TYPE:
219 if (!IS_ENABLED(CONFIG_PCIE_DW_PLAT_HOST))
220 return -ENODEV;
221
222 ret = dw_plat_add_pcie_port(dw_plat_pcie, pdev);
223 if (ret < 0)
224 return ret;
225 break;
226 case DW_PCIE_EP_TYPE:
227 if (!IS_ENABLED(CONFIG_PCIE_DW_PLAT_EP))
228 return -ENODEV;
229
230 ret = dw_plat_add_pcie_ep(dw_plat_pcie, pdev);
231 if (ret < 0)
232 return ret;
233 break;
234 default:
235 dev_err(dev, "INVALID device type %d\n", dw_plat_pcie->mode);
236 }
237
238 return 0;
239}
240
241static const struct dw_plat_pcie_of_data dw_plat_pcie_rc_of_data = {
242 .mode = DW_PCIE_RC_TYPE,
243};
244
245static const struct dw_plat_pcie_of_data dw_plat_pcie_ep_of_data = {
246 .mode = DW_PCIE_EP_TYPE,
247};
248
249static const struct of_device_id dw_plat_pcie_of_match[] = {
250 {
251 .compatible = "snps,dw-pcie",
252 .data = &dw_plat_pcie_rc_of_data,
253 },
254 {
255 .compatible = "snps,dw-pcie-ep",
256 .data = &dw_plat_pcie_ep_of_data,
257 },
258 {},
259};
260
261static struct platform_driver dw_plat_pcie_driver = {
262 .driver = {
263 .name = "dw-pcie",
264 .of_match_table = dw_plat_pcie_of_match,
265 .suppress_bind_attrs = true,
266 },
267 .probe = dw_plat_pcie_probe,
268};
269builtin_platform_driver(dw_plat_pcie_driver);
270
