summaryrefslogtreecommitdiffstats
path: root/drivers/pci/host/pci-dra7xx.c
blob: 923607bdabc5c63ef940453f3ffe42180b29b02b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
/*
 * pcie-dra7xx - PCIe controller driver for TI DRA7xx SoCs
 *
 * Copyright (C) 2013-2014 Texas Instruments Incorporated - http://www.ti.com
 *
 * Authors: Kishon Vijay Abraham I <kishon@ti.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/delay.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_gpio.h>
#include <linux/pci.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/resource.h>
#include <linux/types.h>

#include "pcie-designware.h"

/* PCIe controller wrapper DRA7XX configuration registers */

#define	PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN		0x0024
#define	PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MAIN		0x0028
#define	ERR_SYS						BIT(0)
#define	ERR_FATAL					BIT(1)
#define	ERR_NONFATAL					BIT(2)
#define	ERR_COR						BIT(3)
#define	ERR_AXI						BIT(4)
#define	ERR_ECRC					BIT(5)
#define	PME_TURN_OFF					BIT(8)
#define	PME_TO_ACK					BIT(9)
#define	PM_PME						BIT(10)
#define	LINK_REQ_RST					BIT(11)
#define	LINK_UP_EVT					BIT(12)
#define	CFG_BME_EVT					BIT(13)
#define	CFG_MSE_EVT					BIT(14)
#define	INTERRUPTS (ERR_SYS | ERR_FATAL | ERR_NONFATAL | ERR_COR | ERR_AXI | \
			ERR_ECRC | PME_TURN_OFF | PME_TO_ACK | PM_PME | \
			LINK_REQ_RST | LINK_UP_EVT | CFG_BME_EVT | CFG_MSE_EVT)

#define	PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI		0x0034
#define	PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MSI		0x0038
#define	INTA						BIT(0)
#define	INTB						BIT(1)
#define	INTC						BIT(2)
#define	INTD						BIT(3)
#define	MSI						BIT(4)
#define	LEG_EP_INTERRUPTS (INTA | INTB | INTC | INTD)

#define	PCIECTRL_DRA7XX_CONF_DEVICE_CMD			0x0104
#define	LTSSM_EN					0x1

#define	PCIECTRL_DRA7XX_CONF_PHY_CS			0x010C
#define	LINK_UP						BIT(16)
#define	DRA7XX_CPU_TO_BUS_ADDR				0x0FFFFFFF

struct dra7xx_pcie {
	void __iomem		*base;
	struct phy		**phy;
	int			phy_count;
	struct device		*dev;
	struct pcie_port	pp;
};

#define to_dra7xx_pcie(x)	container_of((x), struct dra7xx_pcie, pp)

static inline u32 dra7xx_pcie_readl(struct dra7xx_pcie *pcie, u32 offset)
{
	return readl(pcie->base + offset);
}

static inline void dra7xx_pcie_writel(struct dra7xx_pcie *pcie, u32 offset,
				      u32 value)
{
	writel(value, pcie->base + offset);
}

static inline u32 dra7xx_pcie_readl_rc(struct pcie_port *pp, u32 offset)
{
	return readl(pp->dbi_base + offset);
}

static inline void dra7xx_pcie_writel_rc(struct pcie_port *pp, u32 offset,
					 u32 value)
{
	writel(value, pp->dbi_base + offset);
}

static int dra7xx_pcie_link_up(struct pcie_port *pp)
{
	struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pp);
	u32 reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_PHY_CS);

	return !!(reg & LINK_UP);
}

static int dra7xx_pcie_establish_link(struct pcie_port *pp)
{
	struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pp);
	u32 reg;
	unsigned int retries;

	if (dw_pcie_link_up(pp)) {
		dev_err(pp->dev, "link is already up\n");
		return 0;
	}

	reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD);
	reg |= LTSSM_EN;
	dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD, reg);

	for (retries = 0; retries < 1000; retries++) {
		if (dw_pcie_link_up(pp))
			return 0;
		usleep_range(10, 20);
	}

	dev_err(pp->dev, "link is not up\n");
	return -EINVAL;
}

static void dra7xx_pcie_enable_interrupts(struct pcie_port *pp)
{
	struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pp);

	dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN,
			   ~INTERRUPTS);
	dra7xx_pcie_writel(dra7xx,
			   PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MAIN, INTERRUPTS);
	dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI,
			   ~LEG_EP_INTERRUPTS & ~MSI);

	if (IS_ENABLED(CONFIG_PCI_MSI))
		dra7xx_pcie_writel(dra7xx,
				   PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MSI, MSI);
	else
		dra7xx_pcie_writel(dra7xx,
				   PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MSI,
				   LEG_EP_INTERRUPTS);
}

static void dra7xx_pcie_host_init(struct pcie_port *pp)
{
	dw_pcie_setup_rc(pp);

	pp->io_base &= DRA7XX_CPU_TO_BUS_ADDR;
	pp->mem_base &= DRA7XX_CPU_TO_BUS_ADDR;
	pp->cfg0_base &= DRA7XX_CPU_TO_BUS_ADDR;
	pp->cfg1_base &= DRA7XX_CPU_TO_BUS_ADDR;

	dra7xx_pcie_establish_link(pp);
	if (IS_ENABLED(CONFIG_PCI_MSI))
		dw_pcie_msi_init(pp);
	dra7xx_pcie_enable_interrupts(pp);
}

static struct pcie_host_ops dra7xx_pcie_host_ops = {
	.link_up = dra7xx_pcie_link_up,
	.host_init = dra7xx_pcie_host_init,
};

static int dra7xx_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
				irq_hw_number_t hwirq)
{
	irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq);
	irq_set_chip_data(irq, domain->host_data);

	return 0;
}

static const struct irq_domain_ops intx_domain_ops = {
	.map = dra7xx_pcie_intx_map,
};

static int dra7xx_pcie_init_irq_domain(struct pcie_port *pp)
{
	struct device *dev = pp->dev;
	struct device_node *node = dev->of_node;
	struct device_node *pcie_intc_node =  of_get_next_child(node, NULL);

	if (!pcie_intc_node) {
		dev_err(dev, "No PCIe Intc node found\n");
		return PTR_ERR(pcie_intc_node);
	}

	pp->irq_domain = irq_domain_add_linear(pcie_intc_node, 4,
					       &intx_domain_ops, pp);
	if (!pp->irq_domain) {
		dev_err(dev, "Failed to get a INTx IRQ domain\n");
		return PTR_ERR(pp->irq_domain);
	}

	return 0;
}

static irqreturn_t dra7xx_pcie_msi_irq_handler(int irq, void *arg)
{
	struct pcie_port *pp = arg;
	struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pp);
	u32 reg;

	reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI);

	switch (reg) {
	case MSI:
		dw_handle_msi_irq(pp);
		break;
	case INTA:
	case INTB:
	case INTC:
	case INTD:
		generic_handle_irq(irq_find_mapping(pp->irq_domain, ffs(reg)));
		break;
	}

	dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI, reg);

	return IRQ_HANDLED;
}


static irqreturn_t dra7xx_pcie_irq_handler(int irq, void *arg)
{
	struct dra7xx_pcie *dra7xx = arg;
	u32 reg;

	reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN);

	if (reg & ERR_SYS)
		dev_dbg(dra7xx->dev, "System Error\n");

	if (reg & ERR_FATAL)
		dev_dbg(dra7xx->dev, "Fatal Error\n");

	if (reg & ERR_NONFATAL)
		dev_dbg(dra7xx->dev, "Non Fatal Error\n");

	if (reg & ERR_COR)
		dev_dbg(dra7xx->dev, "Correctable Error\n");

	if (reg & ERR_AXI)
		dev_dbg(dra7xx->dev, "AXI tag lookup fatal Error\n");

	if (reg & ERR_ECRC)
		dev_dbg(dra7xx->dev, "ECRC Error\n");

	if (reg & PME_TURN_OFF)
		dev_dbg(dra7xx->dev,
			"Power Management Event Turn-Off message received\n");

	if (reg & PME_TO_ACK)
		dev_dbg(dra7xx->dev,
			"Power Management Turn-Off Ack message received\n");

	if (reg & PM_PME)
		dev_dbg(dra7xx->dev,
			"PM Power Management Event message received\n");

	if (reg & LINK_REQ_RST)
		dev_dbg(dra7xx->dev, "Link Request Reset\n");

	if (reg & LINK_UP_EVT)
		dev_dbg(dra7xx->dev, "Link-up state change\n");

	if (reg & CFG_BME_EVT)
		dev_dbg(dra7xx->dev, "CFG 'Bus Master Enable' change\n");

	if (reg & CFG_MSE_EVT)
		dev_dbg(dra7xx->dev, "CFG 'Memory Space Enable' change\n");

	dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN, reg);

	return IRQ_HANDLED;
}

static int __init dra7xx_add_pcie_port(struct dra7xx_pcie *dra7xx,
				       struct platform_device *pdev)
{
	int ret;
	struct pcie_port *pp;
	struct resource *res;
	struct device *dev = &pdev->dev;

	pp = &dra7xx->pp;
	pp->dev = dev;
	pp->ops = &dra7xx_pcie_host_ops;

	pp->irq = platform_get_irq(pdev, 1);
	if (pp->irq < 0) {
		dev_err(dev, "missing IRQ resource\n");
		return -EINVAL;
	}

	ret = devm_request_irq(&pdev->dev, pp->irq,
			       dra7xx_pcie_msi_irq_handler,
			       IRQF_SHARED | IRQF_NO_THREAD,
			       "dra7-pcie-msi",	pp);
	if (ret) {
		dev_err(&pdev->dev, "failed to request irq\n");
		return ret;
	}

	if (!IS_ENABLED(CONFIG_PCI_MSI)) {
		ret = dra7xx_pcie_init_irq_domain(pp);
		if (ret < 0)
			return ret;
	}

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "rc_dbics");
	pp->dbi_base = devm_ioremap(dev, res->start, resource_size(res));
	if (!pp->dbi_base)
		return -ENOMEM;

	ret = dw_pcie_host_init(pp);
	if (ret) {
		dev_err(dra7xx->dev, "failed to initialize host\n");
		return ret;
	}

	return 0;
}

static int __init dra7xx_pcie_probe(struct platform_device *pdev)
{
	u32 reg;
	int ret;
	int irq;
	int i;
	int phy_count;
	struct phy **phy;
	void __iomem *base;
	struct resource *res;
	struct dra7xx_pcie *dra7xx;
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	char name[10];
	int gpio_sel;
	enum of_gpio_flags flags;
	unsigned long gpio_flags;

	dra7xx = devm_kzalloc(dev, sizeof(*dra7xx), GFP_KERNEL);
	if (!dra7xx)
		return -ENOMEM;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		dev_err(dev, "missing IRQ resource\n");
		return -EINVAL;
	}

	ret = devm_request_irq(dev, irq, dra7xx_pcie_irq_handler,
			       IRQF_SHARED, "dra7xx-pcie-main", dra7xx);
	if (ret) {
		dev_err(dev, "failed to request irq\n");
		return ret;
	}

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ti_conf");
	base = devm_ioremap_nocache(dev, res->start, resource_size(res));
	if (!base)
		return -ENOMEM;

	phy_count = of_property_count_strings(np, "phy-names");
	if (phy_count < 0) {
		dev_err(dev, "unable to find the strings\n");
		return phy_count;
	}

	phy = devm_kzalloc(dev, sizeof(*phy) * phy_count, GFP_KERNEL);
	if (!phy)
		return -ENOMEM;

	for (i = 0; i < phy_count; i++) {
		snprintf(name, sizeof(name), "pcie-phy%d", i);
		phy[i] = devm_phy_get(dev, name);
		if (IS_ERR(phy[i]))
			return PTR_ERR(phy[i]);

		ret = phy_init(phy[i]);
		if (ret < 0)
			goto err_phy;

		ret = phy_power_on(phy[i]);
		if (ret < 0) {
			phy_exit(phy[i]);
			goto err_phy;
		}
	}

	dra7xx->base = base;
	dra7xx->phy = phy;
	dra7xx->dev = dev;
	dra7xx->phy_count = phy_count;

	pm_runtime_enable(dev);
	ret = pm_runtime_get_sync(dev);
	if (ret < 0) {
		dev_err(dev, "pm_runtime_get_sync failed\n");
		goto err_get_sync;
	}

	gpio_sel = of_get_gpio_flags(dev->of_node, 0, &flags);
	if (gpio_is_valid(gpio_sel)) {
		gpio_flags = (flags & OF_GPIO_ACTIVE_LOW) ?
				GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH;
		ret = devm_gpio_request_one(dev, gpio_sel, gpio_flags,
					    "pcie_reset");
		if (ret) {
			dev_err(&pdev->dev, "gpio%d request failed, ret %d\n",
				gpio_sel, ret);
			goto err_gpio;
		}
	} else if (gpio_sel == -EPROBE_DEFER) {
		ret = -EPROBE_DEFER;
		goto err_gpio;
	}

	reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD);
	reg &= ~LTSSM_EN;
	dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD, reg);

	platform_set_drvdata(pdev, dra7xx);

	ret = dra7xx_add_pcie_port(dra7xx, pdev);
	if (ret < 0)
		goto err_gpio;

	return 0;

err_gpio:
	pm_runtime_put(dev);

err_get_sync:
	pm_runtime_disable(dev);

err_phy:
	while (--i >= 0) {
		phy_power_off(phy[i]);
		phy_exit(phy[i]);
	}

	return ret;
}

static int __exit dra7xx_pcie_remove(struct platform_device *pdev)
{
	struct dra7xx_pcie *dra7xx = platform_get_drvdata(pdev);
	struct pcie_port *pp = &dra7xx->pp;
	struct device *dev = &pdev->dev;
	int count = dra7xx->phy_count;

	if (pp->irq_domain)
		irq_domain_remove(pp->irq_domain);
	pm_runtime_put(dev);
	pm_runtime_disable(dev);
	while (count--) {
		phy_power_off(dra7xx->phy[count]);
		phy_exit(dra7xx->phy[count]);
	}

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int dra7xx_pcie_suspend(struct device *dev)
{
	struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
	struct pcie_port *pp = &dra7xx->pp;
	u32 val;

	/* clear MSE */
	val = dra7xx_pcie_readl_rc(pp, PCI_COMMAND);
	val &= ~PCI_COMMAND_MEMORY;
	dra7xx_pcie_writel_rc(pp, PCI_COMMAND, val);

	return 0;
}

static int dra7xx_pcie_resume(struct device *dev)
{
	struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
	struct pcie_port *pp = &dra7xx->pp;
	u32 val;

	/* set MSE */
	val = dra7xx_pcie_readl_rc(pp, PCI_COMMAND);
	val |= PCI_COMMAND_MEMORY;
	dra7xx_pcie_writel_rc(pp, PCI_COMMAND, val);

	return 0;
}

static int dra7xx_pcie_suspend_noirq(struct device *dev)
{
	struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
	int count = dra7xx->phy_count;

	while (count--) {
		phy_power_off(dra7xx->phy[count]);
		phy_exit(dra7xx->phy[count]);
	}

	return 0;
}

static int dra7xx_pcie_resume_noirq(struct device *dev)
{
	struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
	int phy_count = dra7xx->phy_count;
	int ret;
	int i;

	for (i = 0; i < phy_count; i++) {
		ret = phy_init(dra7xx->phy[i]);
		if (ret < 0)
			goto err_phy;

		ret = phy_power_on(dra7xx->phy[i]);
		if (ret < 0) {
			phy_exit(dra7xx->phy[i]);
			goto err_phy;
		}
	}

	return 0;

err_phy:
	while (--i >= 0) {
		phy_power_off(dra7xx->phy[i]);
		phy_exit(dra7xx->phy[i]);
	}

	return ret;
}
#endif

static const struct dev_pm_ops dra7xx_pcie_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(dra7xx_pcie_suspend, dra7xx_pcie_resume)
	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(dra7xx_pcie_suspend_noirq,
				      dra7xx_pcie_resume_noirq)
};

static const struct of_device_id of_dra7xx_pcie_match[] = {
	{ .compatible = "ti,dra7-pcie", },
	{},
};
MODULE_DEVICE_TABLE(of, of_dra7xx_pcie_match);

static struct platform_driver dra7xx_pcie_driver = {
	.remove		= __exit_p(dra7xx_pcie_remove),
	.driver = {
		.name	= "dra7-pcie",
		.of_match_table = of_dra7xx_pcie_match,
		.pm	= &dra7xx_pcie_pm_ops,
	},
};

module_platform_driver_probe(dra7xx_pcie_driver, dra7xx_pcie_probe);

MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");
MODULE_DESCRIPTION("TI PCIe controller driver");
MODULE_LICENSE("GPL v2");