summaryrefslogtreecommitdiff
path: root/drivers/pci/controller/dwc/pcie-designware-ep.c
blob: 8650416f6f9e46df6c722be7ae780da0916218d5 (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
// SPDX-License-Identifier: GPL-2.0
/**
 * Synopsys DesignWare PCIe Endpoint controller driver
 *
 * Copyright (C) 2017 Texas Instruments
 * Author: Kishon Vijay Abraham I <kishon@ti.com>
 */

#include <linux/of.h>

#include "pcie-designware.h"
#include <linux/pci-epc.h>
#include <linux/pci-epf.h>

void dw_pcie_ep_linkup(struct dw_pcie_ep *ep)
{
	struct pci_epc *epc = ep->epc;

	pci_epc_linkup(epc);
}

static void __dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar,
				   int flags)
{
	u32 reg;

	reg = PCI_BASE_ADDRESS_0 + (4 * bar);
	dw_pcie_dbi_ro_wr_en(pci);
	dw_pcie_writel_dbi2(pci, reg, 0x0);
	dw_pcie_writel_dbi(pci, reg, 0x0);
	if (flags & PCI_BASE_ADDRESS_MEM_TYPE_64) {
		dw_pcie_writel_dbi2(pci, reg + 4, 0x0);
		dw_pcie_writel_dbi(pci, reg + 4, 0x0);
	}
	dw_pcie_dbi_ro_wr_dis(pci);
}

void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar)
{
	__dw_pcie_ep_reset_bar(pci, bar, 0);
}

static int dw_pcie_ep_write_header(struct pci_epc *epc, u8 func_no,
				   struct pci_epf_header *hdr)
{
	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);

	dw_pcie_dbi_ro_wr_en(pci);
	dw_pcie_writew_dbi(pci, PCI_VENDOR_ID, hdr->vendorid);
	dw_pcie_writew_dbi(pci, PCI_DEVICE_ID, hdr->deviceid);
	dw_pcie_writeb_dbi(pci, PCI_REVISION_ID, hdr->revid);
	dw_pcie_writeb_dbi(pci, PCI_CLASS_PROG, hdr->progif_code);
	dw_pcie_writew_dbi(pci, PCI_CLASS_DEVICE,
			   hdr->subclass_code | hdr->baseclass_code << 8);
	dw_pcie_writeb_dbi(pci, PCI_CACHE_LINE_SIZE,
			   hdr->cache_line_size);
	dw_pcie_writew_dbi(pci, PCI_SUBSYSTEM_VENDOR_ID,
			   hdr->subsys_vendor_id);
	dw_pcie_writew_dbi(pci, PCI_SUBSYSTEM_ID, hdr->subsys_id);
	dw_pcie_writeb_dbi(pci, PCI_INTERRUPT_PIN,
			   hdr->interrupt_pin);
	dw_pcie_dbi_ro_wr_dis(pci);

	return 0;
}

static int dw_pcie_ep_inbound_atu(struct dw_pcie_ep *ep, enum pci_barno bar,
				  dma_addr_t cpu_addr,
				  enum dw_pcie_as_type as_type)
{
	int ret;
	u32 free_win;
	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);

	free_win = find_first_zero_bit(ep->ib_window_map, ep->num_ib_windows);
	if (free_win >= ep->num_ib_windows) {
		dev_err(pci->dev, "No free inbound window\n");
		return -EINVAL;
	}

	ret = dw_pcie_prog_inbound_atu(pci, free_win, bar, cpu_addr,
				       as_type);
	if (ret < 0) {
		dev_err(pci->dev, "Failed to program IB window\n");
		return ret;
	}

	ep->bar_to_atu[bar] = free_win;
	set_bit(free_win, ep->ib_window_map);

	return 0;
}

static int dw_pcie_ep_outbound_atu(struct dw_pcie_ep *ep, phys_addr_t phys_addr,
				   u64 pci_addr, size_t size)
{
	u32 free_win;
	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);

	free_win = find_first_zero_bit(ep->ob_window_map, ep->num_ob_windows);
	if (free_win >= ep->num_ob_windows) {
		dev_err(pci->dev, "No free outbound window\n");
		return -EINVAL;
	}

	dw_pcie_prog_outbound_atu(pci, free_win, PCIE_ATU_TYPE_MEM,
				  phys_addr, pci_addr, size);

	set_bit(free_win, ep->ob_window_map);
	ep->outbound_addr[free_win] = phys_addr;

	return 0;
}

static void dw_pcie_ep_clear_bar(struct pci_epc *epc, u8 func_no,
				 struct pci_epf_bar *epf_bar)
{
	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
	enum pci_barno bar = epf_bar->barno;
	u32 atu_index = ep->bar_to_atu[bar];

	__dw_pcie_ep_reset_bar(pci, bar, epf_bar->flags);

	dw_pcie_disable_atu(pci, atu_index, DW_PCIE_REGION_INBOUND);
	clear_bit(atu_index, ep->ib_window_map);
}

static int dw_pcie_ep_set_bar(struct pci_epc *epc, u8 func_no,
			      struct pci_epf_bar *epf_bar)
{
	int ret;
	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
	enum pci_barno bar = epf_bar->barno;
	size_t size = epf_bar->size;
	int flags = epf_bar->flags;
	enum dw_pcie_as_type as_type;
	u32 reg = PCI_BASE_ADDRESS_0 + (4 * bar);

	if (!(flags & PCI_BASE_ADDRESS_SPACE))
		as_type = DW_PCIE_AS_MEM;
	else
		as_type = DW_PCIE_AS_IO;

	ret = dw_pcie_ep_inbound_atu(ep, bar, epf_bar->phys_addr, as_type);
	if (ret)
		return ret;

	dw_pcie_dbi_ro_wr_en(pci);

	dw_pcie_writel_dbi2(pci, reg, lower_32_bits(size - 1));
	dw_pcie_writel_dbi(pci, reg, flags);

	if (flags & PCI_BASE_ADDRESS_MEM_TYPE_64) {
		dw_pcie_writel_dbi2(pci, reg + 4, upper_32_bits(size - 1));
		dw_pcie_writel_dbi(pci, reg + 4, 0);
	}

	dw_pcie_dbi_ro_wr_dis(pci);

	return 0;
}

static int dw_pcie_find_index(struct dw_pcie_ep *ep, phys_addr_t addr,
			      u32 *atu_index)
{
	u32 index;

	for (index = 0; index < ep->num_ob_windows; index++) {
		if (ep->outbound_addr[index] != addr)
			continue;
		*atu_index = index;
		return 0;
	}

	return -EINVAL;
}

static void dw_pcie_ep_unmap_addr(struct pci_epc *epc, u8 func_no,
				  phys_addr_t addr)
{
	int ret;
	u32 atu_index;
	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);

	ret = dw_pcie_find_index(ep, addr, &atu_index);
	if (ret < 0)
		return;

	dw_pcie_disable_atu(pci, atu_index, DW_PCIE_REGION_OUTBOUND);
	clear_bit(atu_index, ep->ob_window_map);
}

static int dw_pcie_ep_map_addr(struct pci_epc *epc, u8 func_no,
			       phys_addr_t addr,
			       u64 pci_addr, size_t size)
{
	int ret;
	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);

	ret = dw_pcie_ep_outbound_atu(ep, addr, pci_addr, size);
	if (ret) {
		dev_err(pci->dev, "Failed to enable address\n");
		return ret;
	}

	return 0;
}

static int dw_pcie_ep_get_msi(struct pci_epc *epc, u8 func_no)
{
	int val;
	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);

	val = dw_pcie_readw_dbi(pci, MSI_MESSAGE_CONTROL);
	if (!(val & MSI_CAP_MSI_EN_MASK))
		return -EINVAL;

	val = (val & MSI_CAP_MME_MASK) >> MSI_CAP_MME_SHIFT;
	return val;
}

static int dw_pcie_ep_set_msi(struct pci_epc *epc, u8 func_no, u8 encode_int)
{
	int val;
	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);

	val = dw_pcie_readw_dbi(pci, MSI_MESSAGE_CONTROL);
	val &= ~MSI_CAP_MMC_MASK;
	val |= (encode_int << MSI_CAP_MMC_SHIFT) & MSI_CAP_MMC_MASK;
	dw_pcie_dbi_ro_wr_en(pci);
	dw_pcie_writew_dbi(pci, MSI_MESSAGE_CONTROL, val);
	dw_pcie_dbi_ro_wr_dis(pci);

	return 0;
}

static int dw_pcie_ep_raise_irq(struct pci_epc *epc, u8 func_no,
				enum pci_epc_irq_type type, u8 interrupt_num)
{
	struct dw_pcie_ep *ep = epc_get_drvdata(epc);

	if (!ep->ops->raise_irq)
		return -EINVAL;

	return ep->ops->raise_irq(ep, func_no, type, interrupt_num);
}

static void dw_pcie_ep_stop(struct pci_epc *epc)
{
	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);

	if (!pci->ops->stop_link)
		return;

	pci->ops->stop_link(pci);
}

static int dw_pcie_ep_start(struct pci_epc *epc)
{
	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);

	if (!pci->ops->start_link)
		return -EINVAL;

	return pci->ops->start_link(pci);
}

static const struct pci_epc_ops epc_ops = {
	.write_header		= dw_pcie_ep_write_header,
	.set_bar		= dw_pcie_ep_set_bar,
	.clear_bar		= dw_pcie_ep_clear_bar,
	.map_addr		= dw_pcie_ep_map_addr,
	.unmap_addr		= dw_pcie_ep_unmap_addr,
	.set_msi		= dw_pcie_ep_set_msi,
	.get_msi		= dw_pcie_ep_get_msi,
	.raise_irq		= dw_pcie_ep_raise_irq,
	.start			= dw_pcie_ep_start,
	.stop			= dw_pcie_ep_stop,
};

int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 func_no,
			     u8 interrupt_num)
{
	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
	struct pci_epc *epc = ep->epc;
	u16 msg_ctrl, msg_data;
	u32 msg_addr_lower, msg_addr_upper;
	u64 msg_addr;
	bool has_upper;
	int ret;

	/* Raise MSI per the PCI Local Bus Specification Revision 3.0, 6.8.1. */
	msg_ctrl = dw_pcie_readw_dbi(pci, MSI_MESSAGE_CONTROL);
	has_upper = !!(msg_ctrl & PCI_MSI_FLAGS_64BIT);
	msg_addr_lower = dw_pcie_readl_dbi(pci, MSI_MESSAGE_ADDR_L32);
	if (has_upper) {
		msg_addr_upper = dw_pcie_readl_dbi(pci, MSI_MESSAGE_ADDR_U32);
		msg_data = dw_pcie_readw_dbi(pci, MSI_MESSAGE_DATA_64);
	} else {
		msg_addr_upper = 0;
		msg_data = dw_pcie_readw_dbi(pci, MSI_MESSAGE_DATA_32);
	}
	msg_addr = ((u64) msg_addr_upper) << 32 | msg_addr_lower;
	ret = dw_pcie_ep_map_addr(epc, func_no, ep->msi_mem_phys, msg_addr,
				  epc->mem->page_size);
	if (ret)
		return ret;

	writel(msg_data | (interrupt_num - 1), ep->msi_mem);

	dw_pcie_ep_unmap_addr(epc, func_no, ep->msi_mem_phys);

	return 0;
}

void dw_pcie_ep_exit(struct dw_pcie_ep *ep)
{
	struct pci_epc *epc = ep->epc;

	pci_epc_mem_free_addr(epc, ep->msi_mem_phys, ep->msi_mem,
			      epc->mem->page_size);

	pci_epc_mem_exit(epc);
}

int dw_pcie_ep_init(struct dw_pcie_ep *ep)
{
	int ret;
	void *addr;
	struct pci_epc *epc;
	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
	struct device *dev = pci->dev;
	struct device_node *np = dev->of_node;

	if (!pci->dbi_base || !pci->dbi_base2) {
		dev_err(dev, "dbi_base/dbi_base2 is not populated\n");
		return -EINVAL;
	}

	ret = of_property_read_u32(np, "num-ib-windows", &ep->num_ib_windows);
	if (ret < 0) {
		dev_err(dev, "Unable to read *num-ib-windows* property\n");
		return ret;
	}
	if (ep->num_ib_windows > MAX_IATU_IN) {
		dev_err(dev, "Invalid *num-ib-windows*\n");
		return -EINVAL;
	}

	ret = of_property_read_u32(np, "num-ob-windows", &ep->num_ob_windows);
	if (ret < 0) {
		dev_err(dev, "Unable to read *num-ob-windows* property\n");
		return ret;
	}
	if (ep->num_ob_windows > MAX_IATU_OUT) {
		dev_err(dev, "Invalid *num-ob-windows*\n");
		return -EINVAL;
	}

	ep->ib_window_map = devm_kcalloc(dev,
					 BITS_TO_LONGS(ep->num_ib_windows),
					 sizeof(long),
					 GFP_KERNEL);
	if (!ep->ib_window_map)
		return -ENOMEM;

	ep->ob_window_map = devm_kcalloc(dev,
					 BITS_TO_LONGS(ep->num_ob_windows),
					 sizeof(long),
					 GFP_KERNEL);
	if (!ep->ob_window_map)
		return -ENOMEM;

	addr = devm_kcalloc(dev, ep->num_ob_windows, sizeof(phys_addr_t),
			    GFP_KERNEL);
	if (!addr)
		return -ENOMEM;
	ep->outbound_addr = addr;

	if (ep->ops->ep_init)
		ep->ops->ep_init(ep);

	epc = devm_pci_epc_create(dev, &epc_ops);
	if (IS_ERR(epc)) {
		dev_err(dev, "Failed to create epc device\n");
		return PTR_ERR(epc);
	}

	ret = of_property_read_u8(np, "max-functions", &epc->max_functions);
	if (ret < 0)
		epc->max_functions = 1;

	ret = __pci_epc_mem_init(epc, ep->phys_base, ep->addr_size,
				 ep->page_size);
	if (ret < 0) {
		dev_err(dev, "Failed to initialize address space\n");
		return ret;
	}

	ep->msi_mem = pci_epc_mem_alloc_addr(epc, &ep->msi_mem_phys,
					     epc->mem->page_size);
	if (!ep->msi_mem) {
		dev_err(dev, "Failed to reserve memory for MSI\n");
		return -ENOMEM;
	}

	epc->features = EPC_FEATURE_NO_LINKUP_NOTIFIER;
	EPC_FEATURE_SET_BAR(epc->features, BAR_0);

	ep->epc = epc;
	epc_set_drvdata(epc, ep);
	dw_pcie_setup(pci);

	return 0;
}