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12#include <linux/clk.h>
13#include <linux/interrupt.h>
14#include <linux/kernel.h>
15#include <linux/init.h>
16#include <linux/of.h>
17#include <linux/pci.h>
18#include <linux/phy/phy.h>
19#include <linux/platform_device.h>
20#include <linux/resource.h>
21
22#include "pcie-designware.h"
23
24struct spear13xx_pcie {
25 struct dw_pcie *pci;
26 void __iomem *app_base;
27 struct phy *phy;
28 struct clk *clk;
29};
30
31struct pcie_app_reg {
32 u32 app_ctrl_0;
33 u32 app_ctrl_1;
34 u32 app_status_0;
35 u32 app_status_1;
36 u32 msg_status;
37 u32 msg_payload;
38 u32 int_sts;
39 u32 int_clr;
40 u32 int_mask;
41 u32 mst_bmisc;
42 u32 phy_ctrl;
43 u32 phy_status;
44 u32 cxpl_debug_info_0;
45 u32 cxpl_debug_info_1;
46 u32 ven_msg_ctrl_0;
47 u32 ven_msg_ctrl_1;
48 u32 ven_msg_data_0;
49 u32 ven_msg_data_1;
50 u32 ven_msi_0;
51 u32 ven_msi_1;
52 u32 mst_rmisc;
53};
54
55
56#define APP_LTSSM_ENABLE_ID 3
57#define DEVICE_TYPE_RC (4 << 25)
58#define MISCTRL_EN_ID 30
59#define REG_TRANSLATION_ENABLE 31
60
61
62#define XMLH_LINK_UP (1 << 6)
63
64
65#define MSI_CTRL_INT (1 << 26)
66
67#define to_spear13xx_pcie(x) dev_get_drvdata((x)->dev)
68
69static int spear13xx_pcie_start_link(struct dw_pcie *pci)
70{
71 struct spear13xx_pcie *spear13xx_pcie = to_spear13xx_pcie(pci);
72 struct pcie_app_reg *app_reg = spear13xx_pcie->app_base;
73
74
75 writel(DEVICE_TYPE_RC | (1 << MISCTRL_EN_ID)
76 | (1 << APP_LTSSM_ENABLE_ID)
77 | ((u32)1 << REG_TRANSLATION_ENABLE),
78 &app_reg->app_ctrl_0);
79
80 return 0;
81}
82
83static irqreturn_t spear13xx_pcie_irq_handler(int irq, void *arg)
84{
85 struct spear13xx_pcie *spear13xx_pcie = arg;
86 struct pcie_app_reg *app_reg = spear13xx_pcie->app_base;
87 struct dw_pcie *pci = spear13xx_pcie->pci;
88 struct pcie_port *pp = &pci->pp;
89 unsigned int status;
90
91 status = readl(&app_reg->int_sts);
92
93 if (status & MSI_CTRL_INT) {
94 BUG_ON(!IS_ENABLED(CONFIG_PCI_MSI));
95 dw_handle_msi_irq(pp);
96 }
97
98 writel(status, &app_reg->int_clr);
99
100 return IRQ_HANDLED;
101}
102
103static void spear13xx_pcie_enable_interrupts(struct spear13xx_pcie *spear13xx_pcie)
104{
105 struct pcie_app_reg *app_reg = spear13xx_pcie->app_base;
106
107
108 if (IS_ENABLED(CONFIG_PCI_MSI))
109 writel(readl(&app_reg->int_mask) |
110 MSI_CTRL_INT, &app_reg->int_mask);
111}
112
113static int spear13xx_pcie_link_up(struct dw_pcie *pci)
114{
115 struct spear13xx_pcie *spear13xx_pcie = to_spear13xx_pcie(pci);
116 struct pcie_app_reg *app_reg = spear13xx_pcie->app_base;
117
118 if (readl(&app_reg->app_status_1) & XMLH_LINK_UP)
119 return 1;
120
121 return 0;
122}
123
124static int spear13xx_pcie_host_init(struct pcie_port *pp)
125{
126 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
127 struct spear13xx_pcie *spear13xx_pcie = to_spear13xx_pcie(pci);
128 u32 exp_cap_off = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
129 u32 val;
130
131 spear13xx_pcie->app_base = pci->dbi_base + 0x2000;
132
133
134
135
136
137
138 val = dw_pcie_readw_dbi(pci, exp_cap_off + PCI_EXP_DEVCTL);
139 val &= ~PCI_EXP_DEVCTL_READRQ;
140 dw_pcie_writew_dbi(pci, exp_cap_off + PCI_EXP_DEVCTL, val);
141
142 dw_pcie_writew_dbi(pci, PCI_VENDOR_ID, 0x104A);
143 dw_pcie_writew_dbi(pci, PCI_DEVICE_ID, 0xCD80);
144
145 spear13xx_pcie_enable_interrupts(spear13xx_pcie);
146
147 return 0;
148}
149
150static const struct dw_pcie_host_ops spear13xx_pcie_host_ops = {
151 .host_init = spear13xx_pcie_host_init,
152};
153
154static int spear13xx_add_pcie_port(struct spear13xx_pcie *spear13xx_pcie,
155 struct platform_device *pdev)
156{
157 struct dw_pcie *pci = spear13xx_pcie->pci;
158 struct pcie_port *pp = &pci->pp;
159 struct device *dev = &pdev->dev;
160 int ret;
161
162 pp->irq = platform_get_irq(pdev, 0);
163 if (pp->irq < 0)
164 return pp->irq;
165
166 ret = devm_request_irq(dev, pp->irq, spear13xx_pcie_irq_handler,
167 IRQF_SHARED | IRQF_NO_THREAD,
168 "spear1340-pcie", spear13xx_pcie);
169 if (ret) {
170 dev_err(dev, "failed to request irq %d\n", pp->irq);
171 return ret;
172 }
173
174 pp->ops = &spear13xx_pcie_host_ops;
175 pp->msi_irq = -ENODEV;
176
177 ret = dw_pcie_host_init(pp);
178 if (ret) {
179 dev_err(dev, "failed to initialize host\n");
180 return ret;
181 }
182
183 return 0;
184}
185
186static const struct dw_pcie_ops dw_pcie_ops = {
187 .link_up = spear13xx_pcie_link_up,
188 .start_link = spear13xx_pcie_start_link,
189};
190
191static int spear13xx_pcie_probe(struct platform_device *pdev)
192{
193 struct device *dev = &pdev->dev;
194 struct dw_pcie *pci;
195 struct spear13xx_pcie *spear13xx_pcie;
196 struct device_node *np = dev->of_node;
197 int ret;
198
199 spear13xx_pcie = devm_kzalloc(dev, sizeof(*spear13xx_pcie), GFP_KERNEL);
200 if (!spear13xx_pcie)
201 return -ENOMEM;
202
203 pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
204 if (!pci)
205 return -ENOMEM;
206
207 pci->dev = dev;
208 pci->ops = &dw_pcie_ops;
209
210 spear13xx_pcie->pci = pci;
211
212 spear13xx_pcie->phy = devm_phy_get(dev, "pcie-phy");
213 if (IS_ERR(spear13xx_pcie->phy)) {
214 ret = PTR_ERR(spear13xx_pcie->phy);
215 if (ret == -EPROBE_DEFER)
216 dev_info(dev, "probe deferred\n");
217 else
218 dev_err(dev, "couldn't get pcie-phy\n");
219 return ret;
220 }
221
222 phy_init(spear13xx_pcie->phy);
223
224 spear13xx_pcie->clk = devm_clk_get(dev, NULL);
225 if (IS_ERR(spear13xx_pcie->clk)) {
226 dev_err(dev, "couldn't get clk for pcie\n");
227 return PTR_ERR(spear13xx_pcie->clk);
228 }
229 ret = clk_prepare_enable(spear13xx_pcie->clk);
230 if (ret) {
231 dev_err(dev, "couldn't enable clk for pcie\n");
232 return ret;
233 }
234
235 if (of_property_read_bool(np, "st,pcie-is-gen1"))
236 pci->link_gen = 1;
237
238 platform_set_drvdata(pdev, spear13xx_pcie);
239
240 ret = spear13xx_add_pcie_port(spear13xx_pcie, pdev);
241 if (ret < 0)
242 goto fail_clk;
243
244 return 0;
245
246fail_clk:
247 clk_disable_unprepare(spear13xx_pcie->clk);
248
249 return ret;
250}
251
252static const struct of_device_id spear13xx_pcie_of_match[] = {
253 { .compatible = "st,spear1340-pcie", },
254 {},
255};
256
257static struct platform_driver spear13xx_pcie_driver = {
258 .probe = spear13xx_pcie_probe,
259 .driver = {
260 .name = "spear-pcie",
261 .of_match_table = of_match_ptr(spear13xx_pcie_of_match),
262 .suppress_bind_attrs = true,
263 },
264};
265
266builtin_platform_driver(spear13xx_pcie_driver);
267
