tjh.dev
Linux kernel mirror (for testing)
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linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * PCIe host controller driver for Freescale Layerscape SoCs
4 *
5 * Copyright (C) 2014 Freescale Semiconductor.
6 *
7 * Author: Minghuan Lian <Minghuan.Lian@freescale.com>
8 */
9
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/* PEX1/2 Misc Ports Status Register */
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 /* L0 state */
30
31/* PEX Internal Configuration Registers */
32#define PCIE_STRFMR1 0x71c /* Symbol Timer & Filter Mask Register1 */
33#define PCIE_ABSERR 0x8d0 /* Bridge Slave Error Response Register */
34#define PCIE_ABSERR_SETTING 0x9401 /* Forward error of non-posted request */
35
36#define PCIE_IATU_NUM 6
37
38struct 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
46struct 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
56static 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/* Clear multi-function bit */
68static 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/* Drop MSG TLP except for Vendor MSG */
76static 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
86static 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
94static 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
111static 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/* Forward error response of outbound non-posted requests */
127static 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
134static 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 /*
140 * Disable outbound windows configured by the bootloader to avoid
141 * one transaction hitting multiple outbound windows.
142 * dw_pcie_setup_rc() will reconfigure the outbound windows.
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
158static 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
185static 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 * The MSI domain is set by the generic of_msi_configure(). This
194 * .msi_host_init() function keeps us from doing the default MSI
195 * domain setup in dw_pcie_host_init() and also enforces the
196 * requirement that "msi-parent" exists.
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
208static 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
213static 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
218static const struct dw_pcie_ops dw_ls1021_pcie_ops = {
219 .link_up = ls1021_pcie_link_up,
220};
221
222static const struct dw_pcie_ops dw_ls_pcie_ops = {
223 .link_up = ls_pcie_link_up,
224};
225
226static const struct ls_pcie_drvdata ls1021_drvdata = {
227 .ops = &ls1021_pcie_host_ops,
228 .dw_pcie_ops = &dw_ls1021_pcie_ops,
229};
230
231static 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
239static 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
247static 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
255static 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
263static 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,ls1028a-pcie", .data = &ls2088_drvdata },
267 { .compatible = "fsl,ls1043a-pcie", .data = &ls1043_drvdata },
268 { .compatible = "fsl,ls1046a-pcie", .data = &ls1046_drvdata },
269 { .compatible = "fsl,ls2080a-pcie", .data = &ls2080_drvdata },
270 { .compatible = "fsl,ls2085a-pcie", .data = &ls2080_drvdata },
271 { .compatible = "fsl,ls2088a-pcie", .data = &ls2088_drvdata },
272 { .compatible = "fsl,ls1088a-pcie", .data = &ls2088_drvdata },
273 { },
274};
275
276static int __init ls_add_pcie_port(struct ls_pcie *pcie)
277{
278 struct dw_pcie *pci = pcie->pci;
279 struct pcie_port *pp = &pci->pp;
280 struct device *dev = pci->dev;
281 int ret;
282
283 pp->ops = pcie->drvdata->ops;
284
285 ret = dw_pcie_host_init(pp);
286 if (ret) {
287 dev_err(dev, "failed to initialize host\n");
288 return ret;
289 }
290
291 return 0;
292}
293
294static int __init ls_pcie_probe(struct platform_device *pdev)
295{
296 struct device *dev = &pdev->dev;
297 struct dw_pcie *pci;
298 struct ls_pcie *pcie;
299 struct resource *dbi_base;
300 int ret;
301
302 pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
303 if (!pcie)
304 return -ENOMEM;
305
306 pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
307 if (!pci)
308 return -ENOMEM;
309
310 pcie->drvdata = of_device_get_match_data(dev);
311
312 pci->dev = dev;
313 pci->ops = pcie->drvdata->dw_pcie_ops;
314
315 pcie->pci = pci;
316
317 dbi_base = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
318 pci->dbi_base = devm_pci_remap_cfg_resource(dev, dbi_base);
319 if (IS_ERR(pci->dbi_base))
320 return PTR_ERR(pci->dbi_base);
321
322 pcie->lut = pci->dbi_base + pcie->drvdata->lut_offset;
323
324 if (!ls_pcie_is_bridge(pcie))
325 return -ENODEV;
326
327 platform_set_drvdata(pdev, pcie);
328
329 ret = ls_add_pcie_port(pcie);
330 if (ret < 0)
331 return ret;
332
333 return 0;
334}
335
336static struct platform_driver ls_pcie_driver = {
337 .driver = {
338 .name = "layerscape-pcie",
339 .of_match_table = ls_pcie_of_match,
340 .suppress_bind_attrs = true,
341 },
342};
343builtin_platform_driver_probe(ls_pcie_driver, ls_pcie_probe);