This source file includes following definitions.
- ls_pcie_is_bridge
- ls_pcie_clear_multifunction
- ls_pcie_drop_msg_tlp
- ls_pcie_disable_outbound_atus
- ls1021_pcie_link_up
- ls_pcie_link_up
- ls_pcie_fix_error_response
- ls_pcie_host_init
- ls1021_pcie_host_init
- ls_pcie_msi_host_init
- ls_add_pcie_port
- ls_pcie_probe
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10 #include <linux/kernel.h>
11 #include <linux/interrupt.h>
12 #include <linux/init.h>
13 #include <linux/of_pci.h>
14 #include <linux/of_platform.h>
15 #include <linux/of_irq.h>
16 #include <linux/of_address.h>
17 #include <linux/pci.h>
18 #include <linux/platform_device.h>
19 #include <linux/resource.h>
20 #include <linux/mfd/syscon.h>
21 #include <linux/regmap.h>
22
23 #include "pcie-designware.h"
24
25
26 #define SCFG_PEXMSCPORTSR(pex_idx) (0x94 + (pex_idx) * 4)
27 #define LTSSM_STATE_SHIFT 20
28 #define LTSSM_STATE_MASK 0x3f
29 #define LTSSM_PCIE_L0 0x11
30
31
32 #define PCIE_STRFMR1 0x71c
33 #define PCIE_ABSERR 0x8d0
34 #define PCIE_ABSERR_SETTING 0x9401
35
36 #define PCIE_IATU_NUM 6
37
38 struct ls_pcie_drvdata {
39 u32 lut_offset;
40 u32 ltssm_shift;
41 u32 lut_dbg;
42 const struct dw_pcie_host_ops *ops;
43 const struct dw_pcie_ops *dw_pcie_ops;
44 };
45
46 struct ls_pcie {
47 struct dw_pcie *pci;
48 void __iomem *lut;
49 struct regmap *scfg;
50 const struct ls_pcie_drvdata *drvdata;
51 int index;
52 };
53
54 #define to_ls_pcie(x) dev_get_drvdata((x)->dev)
55
56 static bool ls_pcie_is_bridge(struct ls_pcie *pcie)
57 {
58 struct dw_pcie *pci = pcie->pci;
59 u32 header_type;
60
61 header_type = ioread8(pci->dbi_base + PCI_HEADER_TYPE);
62 header_type &= 0x7f;
63
64 return header_type == PCI_HEADER_TYPE_BRIDGE;
65 }
66
67
68 static void ls_pcie_clear_multifunction(struct ls_pcie *pcie)
69 {
70 struct dw_pcie *pci = pcie->pci;
71
72 iowrite8(PCI_HEADER_TYPE_BRIDGE, pci->dbi_base + PCI_HEADER_TYPE);
73 }
74
75
76 static void ls_pcie_drop_msg_tlp(struct ls_pcie *pcie)
77 {
78 u32 val;
79 struct dw_pcie *pci = pcie->pci;
80
81 val = ioread32(pci->dbi_base + PCIE_STRFMR1);
82 val &= 0xDFFFFFFF;
83 iowrite32(val, pci->dbi_base + PCIE_STRFMR1);
84 }
85
86 static void ls_pcie_disable_outbound_atus(struct ls_pcie *pcie)
87 {
88 int i;
89
90 for (i = 0; i < PCIE_IATU_NUM; i++)
91 dw_pcie_disable_atu(pcie->pci, i, DW_PCIE_REGION_OUTBOUND);
92 }
93
94 static int ls1021_pcie_link_up(struct dw_pcie *pci)
95 {
96 u32 state;
97 struct ls_pcie *pcie = to_ls_pcie(pci);
98
99 if (!pcie->scfg)
100 return 0;
101
102 regmap_read(pcie->scfg, SCFG_PEXMSCPORTSR(pcie->index), &state);
103 state = (state >> LTSSM_STATE_SHIFT) & LTSSM_STATE_MASK;
104
105 if (state < LTSSM_PCIE_L0)
106 return 0;
107
108 return 1;
109 }
110
111 static int ls_pcie_link_up(struct dw_pcie *pci)
112 {
113 struct ls_pcie *pcie = to_ls_pcie(pci);
114 u32 state;
115
116 state = (ioread32(pcie->lut + pcie->drvdata->lut_dbg) >>
117 pcie->drvdata->ltssm_shift) &
118 LTSSM_STATE_MASK;
119
120 if (state < LTSSM_PCIE_L0)
121 return 0;
122
123 return 1;
124 }
125
126
127 static void ls_pcie_fix_error_response(struct ls_pcie *pcie)
128 {
129 struct dw_pcie *pci = pcie->pci;
130
131 iowrite32(PCIE_ABSERR_SETTING, pci->dbi_base + PCIE_ABSERR);
132 }
133
134 static int ls_pcie_host_init(struct pcie_port *pp)
135 {
136 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
137 struct ls_pcie *pcie = to_ls_pcie(pci);
138
139
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141
142
143
144 ls_pcie_disable_outbound_atus(pcie);
145 ls_pcie_fix_error_response(pcie);
146
147 dw_pcie_dbi_ro_wr_en(pci);
148 ls_pcie_clear_multifunction(pcie);
149 dw_pcie_dbi_ro_wr_dis(pci);
150
151 ls_pcie_drop_msg_tlp(pcie);
152
153 dw_pcie_setup_rc(pp);
154
155 return 0;
156 }
157
158 static int ls1021_pcie_host_init(struct pcie_port *pp)
159 {
160 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
161 struct ls_pcie *pcie = to_ls_pcie(pci);
162 struct device *dev = pci->dev;
163 u32 index[2];
164 int ret;
165
166 pcie->scfg = syscon_regmap_lookup_by_phandle(dev->of_node,
167 "fsl,pcie-scfg");
168 if (IS_ERR(pcie->scfg)) {
169 ret = PTR_ERR(pcie->scfg);
170 dev_err(dev, "No syscfg phandle specified\n");
171 pcie->scfg = NULL;
172 return ret;
173 }
174
175 if (of_property_read_u32_array(dev->of_node,
176 "fsl,pcie-scfg", index, 2)) {
177 pcie->scfg = NULL;
178 return -EINVAL;
179 }
180 pcie->index = index[1];
181
182 return ls_pcie_host_init(pp);
183 }
184
185 static int ls_pcie_msi_host_init(struct pcie_port *pp)
186 {
187 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
188 struct device *dev = pci->dev;
189 struct device_node *np = dev->of_node;
190 struct device_node *msi_node;
191
192
193
194
195
196
197
198 msi_node = of_parse_phandle(np, "msi-parent", 0);
199 if (!msi_node) {
200 dev_err(dev, "failed to find msi-parent\n");
201 return -EINVAL;
202 }
203
204 of_node_put(msi_node);
205 return 0;
206 }
207
208 static const struct dw_pcie_host_ops ls1021_pcie_host_ops = {
209 .host_init = ls1021_pcie_host_init,
210 .msi_host_init = ls_pcie_msi_host_init,
211 };
212
213 static const struct dw_pcie_host_ops ls_pcie_host_ops = {
214 .host_init = ls_pcie_host_init,
215 .msi_host_init = ls_pcie_msi_host_init,
216 };
217
218 static const struct dw_pcie_ops dw_ls1021_pcie_ops = {
219 .link_up = ls1021_pcie_link_up,
220 };
221
222 static const struct dw_pcie_ops dw_ls_pcie_ops = {
223 .link_up = ls_pcie_link_up,
224 };
225
226 static const struct ls_pcie_drvdata ls1021_drvdata = {
227 .ops = &ls1021_pcie_host_ops,
228 .dw_pcie_ops = &dw_ls1021_pcie_ops,
229 };
230
231 static const struct ls_pcie_drvdata ls1043_drvdata = {
232 .lut_offset = 0x10000,
233 .ltssm_shift = 24,
234 .lut_dbg = 0x7fc,
235 .ops = &ls_pcie_host_ops,
236 .dw_pcie_ops = &dw_ls_pcie_ops,
237 };
238
239 static const struct ls_pcie_drvdata ls1046_drvdata = {
240 .lut_offset = 0x80000,
241 .ltssm_shift = 24,
242 .lut_dbg = 0x407fc,
243 .ops = &ls_pcie_host_ops,
244 .dw_pcie_ops = &dw_ls_pcie_ops,
245 };
246
247 static const struct ls_pcie_drvdata ls2080_drvdata = {
248 .lut_offset = 0x80000,
249 .ltssm_shift = 0,
250 .lut_dbg = 0x7fc,
251 .ops = &ls_pcie_host_ops,
252 .dw_pcie_ops = &dw_ls_pcie_ops,
253 };
254
255 static const struct ls_pcie_drvdata ls2088_drvdata = {
256 .lut_offset = 0x80000,
257 .ltssm_shift = 0,
258 .lut_dbg = 0x407fc,
259 .ops = &ls_pcie_host_ops,
260 .dw_pcie_ops = &dw_ls_pcie_ops,
261 };
262
263 static const struct of_device_id ls_pcie_of_match[] = {
264 { .compatible = "fsl,ls1012a-pcie", .data = &ls1046_drvdata },
265 { .compatible = "fsl,ls1021a-pcie", .data = &ls1021_drvdata },
266 { .compatible = "fsl,ls1043a-pcie", .data = &ls1043_drvdata },
267 { .compatible = "fsl,ls1046a-pcie", .data = &ls1046_drvdata },
268 { .compatible = "fsl,ls2080a-pcie", .data = &ls2080_drvdata },
269 { .compatible = "fsl,ls2085a-pcie", .data = &ls2080_drvdata },
270 { .compatible = "fsl,ls2088a-pcie", .data = &ls2088_drvdata },
271 { .compatible = "fsl,ls1088a-pcie", .data = &ls2088_drvdata },
272 { },
273 };
274
275 static int __init ls_add_pcie_port(struct ls_pcie *pcie)
276 {
277 struct dw_pcie *pci = pcie->pci;
278 struct pcie_port *pp = &pci->pp;
279 struct device *dev = pci->dev;
280 int ret;
281
282 pp->ops = pcie->drvdata->ops;
283
284 ret = dw_pcie_host_init(pp);
285 if (ret) {
286 dev_err(dev, "failed to initialize host\n");
287 return ret;
288 }
289
290 return 0;
291 }
292
293 static int __init ls_pcie_probe(struct platform_device *pdev)
294 {
295 struct device *dev = &pdev->dev;
296 struct dw_pcie *pci;
297 struct ls_pcie *pcie;
298 struct resource *dbi_base;
299 int ret;
300
301 pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
302 if (!pcie)
303 return -ENOMEM;
304
305 pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
306 if (!pci)
307 return -ENOMEM;
308
309 pcie->drvdata = of_device_get_match_data(dev);
310
311 pci->dev = dev;
312 pci->ops = pcie->drvdata->dw_pcie_ops;
313
314 pcie->pci = pci;
315
316 dbi_base = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
317 pci->dbi_base = devm_pci_remap_cfg_resource(dev, dbi_base);
318 if (IS_ERR(pci->dbi_base))
319 return PTR_ERR(pci->dbi_base);
320
321 pcie->lut = pci->dbi_base + pcie->drvdata->lut_offset;
322
323 if (!ls_pcie_is_bridge(pcie))
324 return -ENODEV;
325
326 platform_set_drvdata(pdev, pcie);
327
328 ret = ls_add_pcie_port(pcie);
329 if (ret < 0)
330 return ret;
331
332 return 0;
333 }
334
335 static struct platform_driver ls_pcie_driver = {
336 .driver = {
337 .name = "layerscape-pcie",
338 .of_match_table = ls_pcie_of_match,
339 .suppress_bind_attrs = true,
340 },
341 };
342 builtin_platform_driver_probe(ls_pcie_driver, ls_pcie_probe);