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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * PCIe controller EP driver for Freescale Layerscape SoCs
4 *
5 * Copyright (C) 2018 NXP Semiconductor.
6 *
7 * Author: Xiaowei Bao <xiaowei.bao@nxp.com>
8 */
9
10#include <linux/kernel.h>
11#include <linux/init.h>
12#include <linux/of_pci.h>
13#include <linux/of_platform.h>
14#include <linux/of_address.h>
15#include <linux/pci.h>
16#include <linux/platform_device.h>
17#include <linux/resource.h>
18
19#include "pcie-designware.h"
20
21#define PEX_PF0_CONFIG 0xC0014
22#define PEX_PF0_CFG_READY BIT(0)
23
24/* PEX PFa PCIE PME and message interrupt registers*/
25#define PEX_PF0_PME_MES_DR 0xC0020
26#define PEX_PF0_PME_MES_DR_LUD BIT(7)
27#define PEX_PF0_PME_MES_DR_LDD BIT(9)
28#define PEX_PF0_PME_MES_DR_HRD BIT(10)
29
30#define PEX_PF0_PME_MES_IER 0xC0028
31#define PEX_PF0_PME_MES_IER_LUDIE BIT(7)
32#define PEX_PF0_PME_MES_IER_LDDIE BIT(9)
33#define PEX_PF0_PME_MES_IER_HRDIE BIT(10)
34
35#define to_ls_pcie_ep(x) dev_get_drvdata((x)->dev)
36
37struct ls_pcie_ep_drvdata {
38 u32 func_offset;
39 const struct dw_pcie_ep_ops *ops;
40 const struct dw_pcie_ops *dw_pcie_ops;
41};
42
43struct ls_pcie_ep {
44 struct dw_pcie *pci;
45 struct pci_epc_features *ls_epc;
46 const struct ls_pcie_ep_drvdata *drvdata;
47 int irq;
48 u32 lnkcap;
49 bool big_endian;
50};
51
52static u32 ls_pcie_pf_lut_readl(struct ls_pcie_ep *pcie, u32 offset)
53{
54 struct dw_pcie *pci = pcie->pci;
55
56 if (pcie->big_endian)
57 return ioread32be(pci->dbi_base + offset);
58 else
59 return ioread32(pci->dbi_base + offset);
60}
61
62static void ls_pcie_pf_lut_writel(struct ls_pcie_ep *pcie, u32 offset, u32 value)
63{
64 struct dw_pcie *pci = pcie->pci;
65
66 if (pcie->big_endian)
67 iowrite32be(value, pci->dbi_base + offset);
68 else
69 iowrite32(value, pci->dbi_base + offset);
70}
71
72static irqreturn_t ls_pcie_ep_event_handler(int irq, void *dev_id)
73{
74 struct ls_pcie_ep *pcie = dev_id;
75 struct dw_pcie *pci = pcie->pci;
76 u32 val, cfg;
77 u8 offset;
78
79 val = ls_pcie_pf_lut_readl(pcie, PEX_PF0_PME_MES_DR);
80 ls_pcie_pf_lut_writel(pcie, PEX_PF0_PME_MES_DR, val);
81
82 if (!val)
83 return IRQ_NONE;
84
85 if (val & PEX_PF0_PME_MES_DR_LUD) {
86
87 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
88
89 /*
90 * The values of the Maximum Link Width and Supported Link
91 * Speed from the Link Capabilities Register will be lost
92 * during link down or hot reset. Restore initial value
93 * that configured by the Reset Configuration Word (RCW).
94 */
95 dw_pcie_dbi_ro_wr_en(pci);
96 dw_pcie_writel_dbi(pci, offset + PCI_EXP_LNKCAP, pcie->lnkcap);
97 dw_pcie_dbi_ro_wr_dis(pci);
98
99 cfg = ls_pcie_pf_lut_readl(pcie, PEX_PF0_CONFIG);
100 cfg |= PEX_PF0_CFG_READY;
101 ls_pcie_pf_lut_writel(pcie, PEX_PF0_CONFIG, cfg);
102 dw_pcie_ep_linkup(&pci->ep);
103
104 dev_dbg(pci->dev, "Link up\n");
105 } else if (val & PEX_PF0_PME_MES_DR_LDD) {
106 dev_dbg(pci->dev, "Link down\n");
107 dw_pcie_ep_linkdown(&pci->ep);
108 } else if (val & PEX_PF0_PME_MES_DR_HRD) {
109 dev_dbg(pci->dev, "Hot reset\n");
110 }
111
112 return IRQ_HANDLED;
113}
114
115static int ls_pcie_ep_interrupt_init(struct ls_pcie_ep *pcie,
116 struct platform_device *pdev)
117{
118 u32 val;
119 int ret;
120
121 pcie->irq = platform_get_irq_byname(pdev, "pme");
122 if (pcie->irq < 0)
123 return pcie->irq;
124
125 ret = devm_request_irq(&pdev->dev, pcie->irq, ls_pcie_ep_event_handler,
126 IRQF_SHARED, pdev->name, pcie);
127 if (ret) {
128 dev_err(&pdev->dev, "Can't register PCIe IRQ\n");
129 return ret;
130 }
131
132 /* Enable interrupts */
133 val = ls_pcie_pf_lut_readl(pcie, PEX_PF0_PME_MES_IER);
134 val |= PEX_PF0_PME_MES_IER_LDDIE | PEX_PF0_PME_MES_IER_HRDIE |
135 PEX_PF0_PME_MES_IER_LUDIE;
136 ls_pcie_pf_lut_writel(pcie, PEX_PF0_PME_MES_IER, val);
137
138 return 0;
139}
140
141static const struct pci_epc_features*
142ls_pcie_ep_get_features(struct dw_pcie_ep *ep)
143{
144 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
145 struct ls_pcie_ep *pcie = to_ls_pcie_ep(pci);
146
147 return pcie->ls_epc;
148}
149
150static void ls_pcie_ep_init(struct dw_pcie_ep *ep)
151{
152 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
153 struct ls_pcie_ep *pcie = to_ls_pcie_ep(pci);
154 struct dw_pcie_ep_func *ep_func;
155 enum pci_barno bar;
156
157 ep_func = dw_pcie_ep_get_func_from_ep(ep, 0);
158 if (!ep_func)
159 return;
160
161 for (bar = 0; bar < PCI_STD_NUM_BARS; bar++)
162 dw_pcie_ep_reset_bar(pci, bar);
163
164 pcie->ls_epc->msi_capable = ep_func->msi_cap ? true : false;
165 pcie->ls_epc->msix_capable = ep_func->msix_cap ? true : false;
166}
167
168static int ls_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
169 unsigned int type, u16 interrupt_num)
170{
171 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
172
173 switch (type) {
174 case PCI_IRQ_INTX:
175 return dw_pcie_ep_raise_intx_irq(ep, func_no);
176 case PCI_IRQ_MSI:
177 return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num);
178 case PCI_IRQ_MSIX:
179 return dw_pcie_ep_raise_msix_irq_doorbell(ep, func_no,
180 interrupt_num);
181 default:
182 dev_err(pci->dev, "UNKNOWN IRQ type\n");
183 return -EINVAL;
184 }
185}
186
187static unsigned int ls_pcie_ep_get_dbi_offset(struct dw_pcie_ep *ep, u8 func_no)
188{
189 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
190 struct ls_pcie_ep *pcie = to_ls_pcie_ep(pci);
191
192 WARN_ON(func_no && !pcie->drvdata->func_offset);
193 return pcie->drvdata->func_offset * func_no;
194}
195
196static const struct dw_pcie_ep_ops ls_pcie_ep_ops = {
197 .init = ls_pcie_ep_init,
198 .raise_irq = ls_pcie_ep_raise_irq,
199 .get_features = ls_pcie_ep_get_features,
200 .get_dbi_offset = ls_pcie_ep_get_dbi_offset,
201};
202
203static const struct ls_pcie_ep_drvdata ls1_ep_drvdata = {
204 .ops = &ls_pcie_ep_ops,
205};
206
207static const struct ls_pcie_ep_drvdata ls2_ep_drvdata = {
208 .func_offset = 0x20000,
209 .ops = &ls_pcie_ep_ops,
210};
211
212static const struct ls_pcie_ep_drvdata lx2_ep_drvdata = {
213 .func_offset = 0x8000,
214 .ops = &ls_pcie_ep_ops,
215};
216
217static const struct of_device_id ls_pcie_ep_of_match[] = {
218 { .compatible = "fsl,ls1028a-pcie-ep", .data = &ls1_ep_drvdata },
219 { .compatible = "fsl,ls1046a-pcie-ep", .data = &ls1_ep_drvdata },
220 { .compatible = "fsl,ls1088a-pcie-ep", .data = &ls2_ep_drvdata },
221 { .compatible = "fsl,ls2088a-pcie-ep", .data = &ls2_ep_drvdata },
222 { .compatible = "fsl,lx2160ar2-pcie-ep", .data = &lx2_ep_drvdata },
223 { },
224};
225
226static int __init ls_pcie_ep_probe(struct platform_device *pdev)
227{
228 struct device *dev = &pdev->dev;
229 struct dw_pcie *pci;
230 struct ls_pcie_ep *pcie;
231 struct pci_epc_features *ls_epc;
232 struct resource *dbi_base;
233 u8 offset;
234 int ret;
235
236 pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
237 if (!pcie)
238 return -ENOMEM;
239
240 pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
241 if (!pci)
242 return -ENOMEM;
243
244 ls_epc = devm_kzalloc(dev, sizeof(*ls_epc), GFP_KERNEL);
245 if (!ls_epc)
246 return -ENOMEM;
247
248 pcie->drvdata = of_device_get_match_data(dev);
249
250 pci->dev = dev;
251 pci->ops = pcie->drvdata->dw_pcie_ops;
252
253 ls_epc->bar[BAR_2].only_64bit = true;
254 ls_epc->bar[BAR_3].type = BAR_RESERVED;
255 ls_epc->bar[BAR_4].only_64bit = true;
256 ls_epc->bar[BAR_5].type = BAR_RESERVED;
257 ls_epc->linkup_notifier = true;
258
259 pcie->pci = pci;
260 pcie->ls_epc = ls_epc;
261
262 dbi_base = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
263 pci->dbi_base = devm_pci_remap_cfg_resource(dev, dbi_base);
264 if (IS_ERR(pci->dbi_base))
265 return PTR_ERR(pci->dbi_base);
266
267 pci->ep.ops = &ls_pcie_ep_ops;
268
269 pcie->big_endian = of_property_read_bool(dev->of_node, "big-endian");
270
271 dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
272
273 platform_set_drvdata(pdev, pcie);
274
275 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
276 pcie->lnkcap = dw_pcie_readl_dbi(pci, offset + PCI_EXP_LNKCAP);
277
278 ret = dw_pcie_ep_init(&pci->ep);
279 if (ret)
280 return ret;
281
282 ret = dw_pcie_ep_init_registers(&pci->ep);
283 if (ret) {
284 dev_err(dev, "Failed to initialize DWC endpoint registers\n");
285 dw_pcie_ep_deinit(&pci->ep);
286 return ret;
287 }
288
289 pci_epc_init_notify(pci->ep.epc);
290
291 return ls_pcie_ep_interrupt_init(pcie, pdev);
292}
293
294static struct platform_driver ls_pcie_ep_driver = {
295 .driver = {
296 .name = "layerscape-pcie-ep",
297 .of_match_table = ls_pcie_ep_of_match,
298 .suppress_bind_attrs = true,
299 },
300};
301builtin_platform_driver_probe(ls_pcie_ep_driver, ls_pcie_ep_probe);
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * PCIe controller EP driver for Freescale Layerscape SoCs
4 *
5 * Copyright (C) 2018 NXP Semiconductor.
6 *
7 * Author: Xiaowei Bao <xiaowei.bao@nxp.com>
8 */
9
10#include <linux/kernel.h>
11#include <linux/init.h>
12#include <linux/of_pci.h>
13#include <linux/of_platform.h>
14#include <linux/of_address.h>
15#include <linux/pci.h>
16#include <linux/platform_device.h>
17#include <linux/resource.h>
18
19#include "pcie-designware.h"
20
21#define to_ls_pcie_ep(x) dev_get_drvdata((x)->dev)
22
23struct ls_pcie_ep_drvdata {
24 u32 func_offset;
25 const struct dw_pcie_ep_ops *ops;
26 const struct dw_pcie_ops *dw_pcie_ops;
27};
28
29struct ls_pcie_ep {
30 struct dw_pcie *pci;
31 struct pci_epc_features *ls_epc;
32 const struct ls_pcie_ep_drvdata *drvdata;
33};
34
35static int ls_pcie_establish_link(struct dw_pcie *pci)
36{
37 return 0;
38}
39
40static const struct dw_pcie_ops dw_ls_pcie_ep_ops = {
41 .start_link = ls_pcie_establish_link,
42};
43
44static const struct pci_epc_features*
45ls_pcie_ep_get_features(struct dw_pcie_ep *ep)
46{
47 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
48 struct ls_pcie_ep *pcie = to_ls_pcie_ep(pci);
49
50 return pcie->ls_epc;
51}
52
53static void ls_pcie_ep_init(struct dw_pcie_ep *ep)
54{
55 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
56 struct ls_pcie_ep *pcie = to_ls_pcie_ep(pci);
57 struct dw_pcie_ep_func *ep_func;
58 enum pci_barno bar;
59
60 ep_func = dw_pcie_ep_get_func_from_ep(ep, 0);
61 if (!ep_func)
62 return;
63
64 for (bar = 0; bar < PCI_STD_NUM_BARS; bar++)
65 dw_pcie_ep_reset_bar(pci, bar);
66
67 pcie->ls_epc->msi_capable = ep_func->msi_cap ? true : false;
68 pcie->ls_epc->msix_capable = ep_func->msix_cap ? true : false;
69}
70
71static int ls_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
72 enum pci_epc_irq_type type, u16 interrupt_num)
73{
74 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
75
76 switch (type) {
77 case PCI_EPC_IRQ_LEGACY:
78 return dw_pcie_ep_raise_legacy_irq(ep, func_no);
79 case PCI_EPC_IRQ_MSI:
80 return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num);
81 case PCI_EPC_IRQ_MSIX:
82 return dw_pcie_ep_raise_msix_irq_doorbell(ep, func_no,
83 interrupt_num);
84 default:
85 dev_err(pci->dev, "UNKNOWN IRQ type\n");
86 return -EINVAL;
87 }
88}
89
90static unsigned int ls_pcie_ep_func_conf_select(struct dw_pcie_ep *ep,
91 u8 func_no)
92{
93 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
94 struct ls_pcie_ep *pcie = to_ls_pcie_ep(pci);
95
96 WARN_ON(func_no && !pcie->drvdata->func_offset);
97 return pcie->drvdata->func_offset * func_no;
98}
99
100static const struct dw_pcie_ep_ops ls_pcie_ep_ops = {
101 .ep_init = ls_pcie_ep_init,
102 .raise_irq = ls_pcie_ep_raise_irq,
103 .get_features = ls_pcie_ep_get_features,
104 .func_conf_select = ls_pcie_ep_func_conf_select,
105};
106
107static const struct ls_pcie_ep_drvdata ls1_ep_drvdata = {
108 .ops = &ls_pcie_ep_ops,
109 .dw_pcie_ops = &dw_ls_pcie_ep_ops,
110};
111
112static const struct ls_pcie_ep_drvdata ls2_ep_drvdata = {
113 .func_offset = 0x20000,
114 .ops = &ls_pcie_ep_ops,
115 .dw_pcie_ops = &dw_ls_pcie_ep_ops,
116};
117
118static const struct ls_pcie_ep_drvdata lx2_ep_drvdata = {
119 .func_offset = 0x8000,
120 .ops = &ls_pcie_ep_ops,
121 .dw_pcie_ops = &dw_ls_pcie_ep_ops,
122};
123
124static const struct of_device_id ls_pcie_ep_of_match[] = {
125 { .compatible = "fsl,ls1046a-pcie-ep", .data = &ls1_ep_drvdata },
126 { .compatible = "fsl,ls1088a-pcie-ep", .data = &ls2_ep_drvdata },
127 { .compatible = "fsl,ls2088a-pcie-ep", .data = &ls2_ep_drvdata },
128 { .compatible = "fsl,lx2160ar2-pcie-ep", .data = &lx2_ep_drvdata },
129 { },
130};
131
132static int __init ls_pcie_ep_probe(struct platform_device *pdev)
133{
134 struct device *dev = &pdev->dev;
135 struct dw_pcie *pci;
136 struct ls_pcie_ep *pcie;
137 struct pci_epc_features *ls_epc;
138 struct resource *dbi_base;
139
140 pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
141 if (!pcie)
142 return -ENOMEM;
143
144 pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
145 if (!pci)
146 return -ENOMEM;
147
148 ls_epc = devm_kzalloc(dev, sizeof(*ls_epc), GFP_KERNEL);
149 if (!ls_epc)
150 return -ENOMEM;
151
152 pcie->drvdata = of_device_get_match_data(dev);
153
154 pci->dev = dev;
155 pci->ops = pcie->drvdata->dw_pcie_ops;
156
157 ls_epc->bar_fixed_64bit = (1 << BAR_2) | (1 << BAR_4);
158
159 pcie->pci = pci;
160 pcie->ls_epc = ls_epc;
161
162 dbi_base = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
163 pci->dbi_base = devm_pci_remap_cfg_resource(dev, dbi_base);
164 if (IS_ERR(pci->dbi_base))
165 return PTR_ERR(pci->dbi_base);
166
167 pci->ep.ops = &ls_pcie_ep_ops;
168
169 platform_set_drvdata(pdev, pcie);
170
171 return dw_pcie_ep_init(&pci->ep);
172}
173
174static struct platform_driver ls_pcie_ep_driver = {
175 .driver = {
176 .name = "layerscape-pcie-ep",
177 .of_match_table = ls_pcie_ep_of_match,
178 .suppress_bind_attrs = true,
179 },
180};
181builtin_platform_driver_probe(ls_pcie_ep_driver, ls_pcie_ep_probe);