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15#include <linux/irqchip/chained_irq.h>
16#include <linux/clk.h>
17#include <linux/delay.h>
18#include <linux/interrupt.h>
19#include <linux/irqdomain.h>
20#include <linux/init.h>
21#include <linux/msi.h>
22#include <linux/of_irq.h>
23#include <linux/of.h>
24#include <linux/of_pci.h>
25#include <linux/platform_device.h>
26#include <linux/phy/phy.h>
27#include <linux/resource.h>
28#include <linux/signal.h>
29
30#include "pcie-designware.h"
31#include "pci-keystone.h"
32
33#define DRIVER_NAME "keystone-pcie"
34
35
36#define MAX_MSI_HOST_IRQS 8
37#define MAX_LEGACY_HOST_IRQS 4
38
39
40#define PCIE_CAP_BASE 0x70
41
42
43#define PCIE_RC_K2HK 0xb008
44#define PCIE_RC_K2E 0xb009
45#define PCIE_RC_K2L 0xb00a
46
47#define to_keystone_pcie(x) container_of(x, struct keystone_pcie, pp)
48
49static void quirk_limit_mrrs(struct pci_dev *dev)
50{
51 struct pci_bus *bus = dev->bus;
52 struct pci_dev *bridge = bus->self;
53 static const struct pci_device_id rc_pci_devids[] = {
54 { PCI_DEVICE(PCI_VENDOR_ID_TI, PCIE_RC_K2HK),
55 .class = PCI_CLASS_BRIDGE_PCI << 8, .class_mask = ~0, },
56 { PCI_DEVICE(PCI_VENDOR_ID_TI, PCIE_RC_K2E),
57 .class = PCI_CLASS_BRIDGE_PCI << 8, .class_mask = ~0, },
58 { PCI_DEVICE(PCI_VENDOR_ID_TI, PCIE_RC_K2L),
59 .class = PCI_CLASS_BRIDGE_PCI << 8, .class_mask = ~0, },
60 { 0, },
61 };
62
63 if (pci_is_root_bus(bus))
64 return;
65
66
67 while (!pci_is_root_bus(bus)) {
68 bridge = bus->self;
69 bus = bus->parent;
70 }
71
72 if (bridge) {
73
74
75
76
77
78
79 if (pci_match_id(rc_pci_devids, bridge)) {
80 if (pcie_get_readrq(dev) > 256) {
81 dev_info(&dev->dev, "limiting MRRS to 256\n");
82 pcie_set_readrq(dev, 256);
83 }
84 }
85 }
86}
87DECLARE_PCI_FIXUP_ENABLE(PCI_ANY_ID, PCI_ANY_ID, quirk_limit_mrrs);
88
89static int ks_pcie_establish_link(struct keystone_pcie *ks_pcie)
90{
91 struct pcie_port *pp = &ks_pcie->pp;
92 struct device *dev = pp->dev;
93 unsigned int retries;
94
95 dw_pcie_setup_rc(pp);
96
97 if (dw_pcie_link_up(pp)) {
98 dev_err(dev, "Link already up\n");
99 return 0;
100 }
101
102
103 for (retries = 0; retries < 5; retries++) {
104 ks_dw_pcie_initiate_link_train(ks_pcie);
105 if (!dw_pcie_wait_for_link(pp))
106 return 0;
107 }
108
109 dev_err(dev, "phy link never came up\n");
110 return -ETIMEDOUT;
111}
112
113static void ks_pcie_msi_irq_handler(struct irq_desc *desc)
114{
115 unsigned int irq = irq_desc_get_irq(desc);
116 struct keystone_pcie *ks_pcie = irq_desc_get_handler_data(desc);
117 u32 offset = irq - ks_pcie->msi_host_irqs[0];
118 struct pcie_port *pp = &ks_pcie->pp;
119 struct device *dev = pp->dev;
120 struct irq_chip *chip = irq_desc_get_chip(desc);
121
122 dev_dbg(dev, "%s, irq %d\n", __func__, irq);
123
124
125
126
127
128
129 chained_irq_enter(chip, desc);
130 ks_dw_pcie_handle_msi_irq(ks_pcie, offset);
131 chained_irq_exit(chip, desc);
132}
133
134
135
136
137
138
139
140
141
142static void ks_pcie_legacy_irq_handler(struct irq_desc *desc)
143{
144 unsigned int irq = irq_desc_get_irq(desc);
145 struct keystone_pcie *ks_pcie = irq_desc_get_handler_data(desc);
146 struct pcie_port *pp = &ks_pcie->pp;
147 struct device *dev = pp->dev;
148 u32 irq_offset = irq - ks_pcie->legacy_host_irqs[0];
149 struct irq_chip *chip = irq_desc_get_chip(desc);
150
151 dev_dbg(dev, ": Handling legacy irq %d\n", irq);
152
153
154
155
156
157
158 chained_irq_enter(chip, desc);
159 ks_dw_pcie_handle_legacy_irq(ks_pcie, irq_offset);
160 chained_irq_exit(chip, desc);
161}
162
163static int ks_pcie_get_irq_controller_info(struct keystone_pcie *ks_pcie,
164 char *controller, int *num_irqs)
165{
166 int temp, max_host_irqs, legacy = 1, *host_irqs;
167 struct device *dev = ks_pcie->pp.dev;
168 struct device_node *np_pcie = dev->of_node, **np_temp;
169
170 if (!strcmp(controller, "msi-interrupt-controller"))
171 legacy = 0;
172
173 if (legacy) {
174 np_temp = &ks_pcie->legacy_intc_np;
175 max_host_irqs = MAX_LEGACY_HOST_IRQS;
176 host_irqs = &ks_pcie->legacy_host_irqs[0];
177 } else {
178 np_temp = &ks_pcie->msi_intc_np;
179 max_host_irqs = MAX_MSI_HOST_IRQS;
180 host_irqs = &ks_pcie->msi_host_irqs[0];
181 }
182
183
184 *np_temp = of_find_node_by_name(np_pcie, controller);
185 if (!(*np_temp)) {
186 dev_err(dev, "Node for %s is absent\n", controller);
187 return -EINVAL;
188 }
189
190 temp = of_irq_count(*np_temp);
191 if (!temp) {
192 dev_err(dev, "No IRQ entries in %s\n", controller);
193 return -EINVAL;
194 }
195
196 if (temp > max_host_irqs)
197 dev_warn(dev, "Too many %s interrupts defined %u\n",
198 (legacy ? "legacy" : "MSI"), temp);
199
200
201
202
203
204 for (temp = 0; temp < max_host_irqs; temp++) {
205 host_irqs[temp] = irq_of_parse_and_map(*np_temp, temp);
206 if (!host_irqs[temp])
207 break;
208 }
209
210 if (temp) {
211 *num_irqs = temp;
212 return 0;
213 }
214
215 return -EINVAL;
216}
217
218static void ks_pcie_setup_interrupts(struct keystone_pcie *ks_pcie)
219{
220 int i;
221
222
223 for (i = 0; i < ks_pcie->num_legacy_host_irqs; i++) {
224 irq_set_chained_handler_and_data(ks_pcie->legacy_host_irqs[i],
225 ks_pcie_legacy_irq_handler,
226 ks_pcie);
227 }
228 ks_dw_pcie_enable_legacy_irqs(ks_pcie);
229
230
231 if (IS_ENABLED(CONFIG_PCI_MSI)) {
232 for (i = 0; i < ks_pcie->num_msi_host_irqs; i++) {
233 irq_set_chained_handler_and_data(ks_pcie->msi_host_irqs[i],
234 ks_pcie_msi_irq_handler,
235 ks_pcie);
236 }
237 }
238
239 if (ks_pcie->error_irq > 0)
240 ks_dw_pcie_enable_error_irq(ks_pcie);
241}
242
243
244
245
246
247
248static int keystone_pcie_fault(unsigned long addr, unsigned int fsr,
249 struct pt_regs *regs)
250{
251 unsigned long instr = *(unsigned long *) instruction_pointer(regs);
252
253 if ((instr & 0x0e100090) == 0x00100090) {
254 int reg = (instr >> 12) & 15;
255
256 regs->uregs[reg] = -1;
257 regs->ARM_pc += 4;
258 }
259
260 return 0;
261}
262
263static void __init ks_pcie_host_init(struct pcie_port *pp)
264{
265 struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
266 u32 val;
267
268 ks_pcie_establish_link(ks_pcie);
269 ks_dw_pcie_setup_rc_app_regs(ks_pcie);
270 ks_pcie_setup_interrupts(ks_pcie);
271 writew(PCI_IO_RANGE_TYPE_32 | (PCI_IO_RANGE_TYPE_32 << 8),
272 pp->dbi_base + PCI_IO_BASE);
273
274
275 writew(ks_pcie->device_id, pp->dbi_base + PCI_DEVICE_ID);
276
277
278 val = readl(pp->dbi_base + PCIE_CAP_BASE + PCI_EXP_DEVCTL);
279 val &= ~PCI_EXP_DEVCTL_READRQ;
280
281 val |= BIT(12);
282 writel(val, pp->dbi_base + PCIE_CAP_BASE + PCI_EXP_DEVCTL);
283
284
285
286
287
288 hook_fault_code(17, keystone_pcie_fault, SIGBUS, 0,
289 "Asynchronous external abort");
290}
291
292static struct pcie_host_ops keystone_pcie_host_ops = {
293 .rd_other_conf = ks_dw_pcie_rd_other_conf,
294 .wr_other_conf = ks_dw_pcie_wr_other_conf,
295 .link_up = ks_dw_pcie_link_up,
296 .host_init = ks_pcie_host_init,
297 .msi_set_irq = ks_dw_pcie_msi_set_irq,
298 .msi_clear_irq = ks_dw_pcie_msi_clear_irq,
299 .get_msi_addr = ks_dw_pcie_get_msi_addr,
300 .msi_host_init = ks_dw_pcie_msi_host_init,
301 .scan_bus = ks_dw_pcie_v3_65_scan_bus,
302};
303
304static irqreturn_t pcie_err_irq_handler(int irq, void *priv)
305{
306 struct keystone_pcie *ks_pcie = priv;
307
308 return ks_dw_pcie_handle_error_irq(ks_pcie);
309}
310
311static int __init ks_add_pcie_port(struct keystone_pcie *ks_pcie,
312 struct platform_device *pdev)
313{
314 struct pcie_port *pp = &ks_pcie->pp;
315 struct device *dev = pp->dev;
316 int ret;
317
318 ret = ks_pcie_get_irq_controller_info(ks_pcie,
319 "legacy-interrupt-controller",
320 &ks_pcie->num_legacy_host_irqs);
321 if (ret)
322 return ret;
323
324 if (IS_ENABLED(CONFIG_PCI_MSI)) {
325 ret = ks_pcie_get_irq_controller_info(ks_pcie,
326 "msi-interrupt-controller",
327 &ks_pcie->num_msi_host_irqs);
328 if (ret)
329 return ret;
330 }
331
332
333
334
335
336 ks_pcie->error_irq = irq_of_parse_and_map(ks_pcie->np, 0);
337 if (ks_pcie->error_irq <= 0)
338 dev_info(dev, "no error IRQ defined\n");
339 else {
340 ret = request_irq(ks_pcie->error_irq, pcie_err_irq_handler,
341 IRQF_SHARED, "pcie-error-irq", ks_pcie);
342 if (ret < 0) {
343 dev_err(dev, "failed to request error IRQ %d\n",
344 ks_pcie->error_irq);
345 return ret;
346 }
347 }
348
349 pp->root_bus_nr = -1;
350 pp->ops = &keystone_pcie_host_ops;
351 ret = ks_dw_pcie_host_init(ks_pcie, ks_pcie->msi_intc_np);
352 if (ret) {
353 dev_err(dev, "failed to initialize host\n");
354 return ret;
355 }
356
357 return 0;
358}
359
360static const struct of_device_id ks_pcie_of_match[] = {
361 {
362 .type = "pci",
363 .compatible = "ti,keystone-pcie",
364 },
365 { },
366};
367
368static int __exit ks_pcie_remove(struct platform_device *pdev)
369{
370 struct keystone_pcie *ks_pcie = platform_get_drvdata(pdev);
371
372 clk_disable_unprepare(ks_pcie->clk);
373
374 return 0;
375}
376
377static int __init ks_pcie_probe(struct platform_device *pdev)
378{
379 struct device *dev = &pdev->dev;
380 struct keystone_pcie *ks_pcie;
381 struct pcie_port *pp;
382 struct resource *res;
383 void __iomem *reg_p;
384 struct phy *phy;
385 int ret;
386
387 ks_pcie = devm_kzalloc(dev, sizeof(*ks_pcie), GFP_KERNEL);
388 if (!ks_pcie)
389 return -ENOMEM;
390
391 pp = &ks_pcie->pp;
392 pp->dev = dev;
393
394
395 phy = devm_phy_get(dev, "pcie-phy");
396 if (PTR_ERR_OR_ZERO(phy) == -EPROBE_DEFER)
397 return PTR_ERR(phy);
398
399 if (!IS_ERR_OR_NULL(phy)) {
400 ret = phy_init(phy);
401 if (ret < 0)
402 return ret;
403 }
404
405
406 res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
407 reg_p = devm_ioremap_resource(dev, res);
408 if (IS_ERR(reg_p))
409 return PTR_ERR(reg_p);
410 ks_pcie->device_id = readl(reg_p) >> 16;
411 devm_iounmap(dev, reg_p);
412 devm_release_mem_region(dev, res->start, resource_size(res));
413
414 ks_pcie->np = dev->of_node;
415 platform_set_drvdata(pdev, ks_pcie);
416 ks_pcie->clk = devm_clk_get(dev, "pcie");
417 if (IS_ERR(ks_pcie->clk)) {
418 dev_err(dev, "Failed to get pcie rc clock\n");
419 return PTR_ERR(ks_pcie->clk);
420 }
421 ret = clk_prepare_enable(ks_pcie->clk);
422 if (ret)
423 return ret;
424
425 ret = ks_add_pcie_port(ks_pcie, pdev);
426 if (ret < 0)
427 goto fail_clk;
428
429 return 0;
430fail_clk:
431 clk_disable_unprepare(ks_pcie->clk);
432
433 return ret;
434}
435
436static struct platform_driver ks_pcie_driver __refdata = {
437 .probe = ks_pcie_probe,
438 .remove = __exit_p(ks_pcie_remove),
439 .driver = {
440 .name = "keystone-pcie",
441 .of_match_table = of_match_ptr(ks_pcie_of_match),
442 },
443};
444builtin_platform_driver(ks_pcie_driver);
445
