1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Synopsys DesignWare PCIe Endpoint controller driver
  4 *
  5 * Copyright (C) 2017 Texas Instruments
  6 * Author: Kishon Vijay Abraham I <kishon@ti.com>
  7 */
  8
  9#include <linux/align.h>
 10#include <linux/bitfield.h>
 11#include <linux/of.h>
 12#include <linux/platform_device.h>
 13
 14#include "pcie-designware.h"
 15#include <linux/pci-epc.h>
 16#include <linux/pci-epf.h>
 17
 18/**
 19 * dw_pcie_ep_get_func_from_ep - Get the struct dw_pcie_ep_func corresponding to
 20 *				 the endpoint function
 21 * @ep: DWC EP device
 22 * @func_no: Function number of the endpoint device
 23 *
 24 * Return: struct dw_pcie_ep_func if success, NULL otherwise.
 25 */
 
 
 
 
 
 
 
 
 
 
 26struct dw_pcie_ep_func *
 27dw_pcie_ep_get_func_from_ep(struct dw_pcie_ep *ep, u8 func_no)
 28{
 29	struct dw_pcie_ep_func *ep_func;
 30
 31	list_for_each_entry(ep_func, &ep->func_list, list) {
 32		if (ep_func->func_no == func_no)
 33			return ep_func;
 34	}
 35
 36	return NULL;
 37}
 38
 
 
 
 
 
 
 
 
 
 
 39static void __dw_pcie_ep_reset_bar(struct dw_pcie *pci, u8 func_no,
 40				   enum pci_barno bar, int flags)
 41{
 42	struct dw_pcie_ep *ep = &pci->ep;
 43	u32 reg;
 
 
 
 
 44
 45	reg = PCI_BASE_ADDRESS_0 + (4 * bar);
 46	dw_pcie_dbi_ro_wr_en(pci);
 47	dw_pcie_ep_writel_dbi2(ep, func_no, reg, 0x0);
 48	dw_pcie_ep_writel_dbi(ep, func_no, reg, 0x0);
 49	if (flags & PCI_BASE_ADDRESS_MEM_TYPE_64) {
 50		dw_pcie_ep_writel_dbi2(ep, func_no, reg + 4, 0x0);
 51		dw_pcie_ep_writel_dbi(ep, func_no, reg + 4, 0x0);
 52	}
 53	dw_pcie_dbi_ro_wr_dis(pci);
 54}
 55
 56/**
 57 * dw_pcie_ep_reset_bar - Reset endpoint BAR
 58 * @pci: DWC PCI device
 59 * @bar: BAR number of the endpoint
 60 */
 61void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar)
 62{
 63	u8 func_no, funcs;
 64
 65	funcs = pci->ep.epc->max_functions;
 66
 67	for (func_no = 0; func_no < funcs; func_no++)
 68		__dw_pcie_ep_reset_bar(pci, func_no, bar, 0);
 69}
 70EXPORT_SYMBOL_GPL(dw_pcie_ep_reset_bar);
 71
 72static u8 __dw_pcie_ep_find_next_cap(struct dw_pcie_ep *ep, u8 func_no,
 73				     u8 cap_ptr, u8 cap)
 74{
 
 
 75	u8 cap_id, next_cap_ptr;
 76	u16 reg;
 77
 78	if (!cap_ptr)
 79		return 0;
 80
 81	reg = dw_pcie_ep_readw_dbi(ep, func_no, cap_ptr);
 
 
 82	cap_id = (reg & 0x00ff);
 83
 84	if (cap_id > PCI_CAP_ID_MAX)
 85		return 0;
 86
 87	if (cap_id == cap)
 88		return cap_ptr;
 89
 90	next_cap_ptr = (reg & 0xff00) >> 8;
 91	return __dw_pcie_ep_find_next_cap(ep, func_no, next_cap_ptr, cap);
 92}
 93
 94static u8 dw_pcie_ep_find_capability(struct dw_pcie_ep *ep, u8 func_no, u8 cap)
 95{
 
 
 96	u8 next_cap_ptr;
 97	u16 reg;
 98
 99	reg = dw_pcie_ep_readw_dbi(ep, func_no, PCI_CAPABILITY_LIST);
 
 
100	next_cap_ptr = (reg & 0x00ff);
101
102	return __dw_pcie_ep_find_next_cap(ep, func_no, next_cap_ptr, cap);
103}
104
105static int dw_pcie_ep_write_header(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
106				   struct pci_epf_header *hdr)
107{
108	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
109	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
 
 
 
110
111	dw_pcie_dbi_ro_wr_en(pci);
112	dw_pcie_ep_writew_dbi(ep, func_no, PCI_VENDOR_ID, hdr->vendorid);
113	dw_pcie_ep_writew_dbi(ep, func_no, PCI_DEVICE_ID, hdr->deviceid);
114	dw_pcie_ep_writeb_dbi(ep, func_no, PCI_REVISION_ID, hdr->revid);
115	dw_pcie_ep_writeb_dbi(ep, func_no, PCI_CLASS_PROG, hdr->progif_code);
116	dw_pcie_ep_writew_dbi(ep, func_no, PCI_CLASS_DEVICE,
117			      hdr->subclass_code | hdr->baseclass_code << 8);
118	dw_pcie_ep_writeb_dbi(ep, func_no, PCI_CACHE_LINE_SIZE,
119			      hdr->cache_line_size);
120	dw_pcie_ep_writew_dbi(ep, func_no, PCI_SUBSYSTEM_VENDOR_ID,
121			      hdr->subsys_vendor_id);
122	dw_pcie_ep_writew_dbi(ep, func_no, PCI_SUBSYSTEM_ID, hdr->subsys_id);
123	dw_pcie_ep_writeb_dbi(ep, func_no, PCI_INTERRUPT_PIN,
124			      hdr->interrupt_pin);
125	dw_pcie_dbi_ro_wr_dis(pci);
126
127	return 0;
128}
129
130static int dw_pcie_ep_inbound_atu(struct dw_pcie_ep *ep, u8 func_no, int type,
131				  dma_addr_t cpu_addr, enum pci_barno bar)
 
132{
133	int ret;
134	u32 free_win;
135	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
136
137	if (!ep->bar_to_atu[bar])
138		free_win = find_first_zero_bit(ep->ib_window_map, pci->num_ib_windows);
139	else
140		free_win = ep->bar_to_atu[bar] - 1;
141
142	if (free_win >= pci->num_ib_windows) {
143		dev_err(pci->dev, "No free inbound window\n");
144		return -EINVAL;
145	}
146
147	ret = dw_pcie_prog_ep_inbound_atu(pci, func_no, free_win, type,
148					  cpu_addr, bar);
149	if (ret < 0) {
150		dev_err(pci->dev, "Failed to program IB window\n");
151		return ret;
152	}
153
154	/*
155	 * Always increment free_win before assignment, since value 0 is used to identify
156	 * unallocated mapping.
157	 */
158	ep->bar_to_atu[bar] = free_win + 1;
159	set_bit(free_win, ep->ib_window_map);
160
161	return 0;
162}
163
164static int dw_pcie_ep_outbound_atu(struct dw_pcie_ep *ep,
165				   struct dw_pcie_ob_atu_cfg *atu)
 
166{
167	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
168	u32 free_win;
169	int ret;
170
171	free_win = find_first_zero_bit(ep->ob_window_map, pci->num_ob_windows);
172	if (free_win >= pci->num_ob_windows) {
173		dev_err(pci->dev, "No free outbound window\n");
174		return -EINVAL;
175	}
176
177	atu->index = free_win;
178	ret = dw_pcie_prog_outbound_atu(pci, atu);
179	if (ret)
180		return ret;
181
182	set_bit(free_win, ep->ob_window_map);
183	ep->outbound_addr[free_win] = atu->cpu_addr;
184
185	return 0;
186}
187
188static void dw_pcie_ep_clear_bar(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
189				 struct pci_epf_bar *epf_bar)
190{
191	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
192	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
193	enum pci_barno bar = epf_bar->barno;
194	u32 atu_index = ep->bar_to_atu[bar] - 1;
195
196	if (!ep->bar_to_atu[bar])
197		return;
198
199	__dw_pcie_ep_reset_bar(pci, func_no, bar, epf_bar->flags);
200
201	dw_pcie_disable_atu(pci, PCIE_ATU_REGION_DIR_IB, atu_index);
202	clear_bit(atu_index, ep->ib_window_map);
203	ep->epf_bar[bar] = NULL;
204	ep->bar_to_atu[bar] = 0;
205}
206
207static int dw_pcie_ep_set_bar(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
208			      struct pci_epf_bar *epf_bar)
209{
 
210	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
211	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
212	enum pci_barno bar = epf_bar->barno;
213	size_t size = epf_bar->size;
214	int flags = epf_bar->flags;
215	int ret, type;
216	u32 reg;
 
217
218	/*
219	 * DWC does not allow BAR pairs to overlap, e.g. you cannot combine BARs
220	 * 1 and 2 to form a 64-bit BAR.
221	 */
222	if ((flags & PCI_BASE_ADDRESS_MEM_TYPE_64) && (bar & 1))
223		return -EINVAL;
224
225	/*
226	 * Certain EPF drivers dynamically change the physical address of a BAR
227	 * (i.e. they call set_bar() twice, without ever calling clear_bar(), as
228	 * calling clear_bar() would clear the BAR's PCI address assigned by the
229	 * host).
230	 */
231	if (ep->epf_bar[bar]) {
232		/*
233		 * We can only dynamically change a BAR if the new BAR size and
234		 * BAR flags do not differ from the existing configuration.
235		 */
236		if (ep->epf_bar[bar]->barno != bar ||
237		    ep->epf_bar[bar]->size != size ||
238		    ep->epf_bar[bar]->flags != flags)
239			return -EINVAL;
240
241		/*
242		 * When dynamically changing a BAR, skip writing the BAR reg, as
243		 * that would clear the BAR's PCI address assigned by the host.
244		 */
245		goto config_atu;
246	}
247
248	reg = PCI_BASE_ADDRESS_0 + (4 * bar);
249
250	dw_pcie_dbi_ro_wr_en(pci);
251
252	dw_pcie_ep_writel_dbi2(ep, func_no, reg, lower_32_bits(size - 1));
253	dw_pcie_ep_writel_dbi(ep, func_no, reg, flags);
254
255	if (flags & PCI_BASE_ADDRESS_MEM_TYPE_64) {
256		dw_pcie_ep_writel_dbi2(ep, func_no, reg + 4, upper_32_bits(size - 1));
257		dw_pcie_ep_writel_dbi(ep, func_no, reg + 4, 0);
258	}
259
260	dw_pcie_dbi_ro_wr_dis(pci);
261
262config_atu:
263	if (!(flags & PCI_BASE_ADDRESS_SPACE))
264		type = PCIE_ATU_TYPE_MEM;
265	else
266		type = PCIE_ATU_TYPE_IO;
267
268	ret = dw_pcie_ep_inbound_atu(ep, func_no, type, epf_bar->phys_addr, bar);
 
269	if (ret)
270		return ret;
271
 
 
 
 
 
 
 
 
 
 
272	ep->epf_bar[bar] = epf_bar;
 
273
274	return 0;
275}
276
277static int dw_pcie_find_index(struct dw_pcie_ep *ep, phys_addr_t addr,
278			      u32 *atu_index)
279{
280	u32 index;
281	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
282
283	for (index = 0; index < pci->num_ob_windows; index++) {
284		if (ep->outbound_addr[index] != addr)
285			continue;
286		*atu_index = index;
287		return 0;
288	}
289
290	return -EINVAL;
291}
292
293static u64 dw_pcie_ep_align_addr(struct pci_epc *epc, u64 pci_addr,
294				 size_t *pci_size, size_t *offset)
295{
296	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
297	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
298	u64 mask = pci->region_align - 1;
299	size_t ofst = pci_addr & mask;
300
301	*pci_size = ALIGN(ofst + *pci_size, epc->mem->window.page_size);
302	*offset = ofst;
303
304	return pci_addr & ~mask;
305}
306
307static void dw_pcie_ep_unmap_addr(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
308				  phys_addr_t addr)
309{
310	int ret;
311	u32 atu_index;
312	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
313	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
314
315	ret = dw_pcie_find_index(ep, addr, &atu_index);
316	if (ret < 0)
317		return;
318
319	ep->outbound_addr[atu_index] = 0;
320	dw_pcie_disable_atu(pci, PCIE_ATU_REGION_DIR_OB, atu_index);
321	clear_bit(atu_index, ep->ob_window_map);
322}
323
324static int dw_pcie_ep_map_addr(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
325			       phys_addr_t addr, u64 pci_addr, size_t size)
 
326{
327	int ret;
328	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
329	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
330	struct dw_pcie_ob_atu_cfg atu = { 0 };
331
332	atu.func_no = func_no;
333	atu.type = PCIE_ATU_TYPE_MEM;
334	atu.cpu_addr = addr;
335	atu.pci_addr = pci_addr;
336	atu.size = size;
337	ret = dw_pcie_ep_outbound_atu(ep, &atu);
338	if (ret) {
339		dev_err(pci->dev, "Failed to enable address\n");
340		return ret;
341	}
342
343	return 0;
344}
345
346static int dw_pcie_ep_get_msi(struct pci_epc *epc, u8 func_no, u8 vfunc_no)
347{
348	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
349	struct dw_pcie_ep_func *ep_func;
350	u32 val, reg;
 
 
351
352	ep_func = dw_pcie_ep_get_func_from_ep(ep, func_no);
353	if (!ep_func || !ep_func->msi_cap)
354		return -EINVAL;
355
356	reg = ep_func->msi_cap + PCI_MSI_FLAGS;
357	val = dw_pcie_ep_readw_dbi(ep, func_no, reg);
 
 
358	if (!(val & PCI_MSI_FLAGS_ENABLE))
359		return -EINVAL;
360
361	val = FIELD_GET(PCI_MSI_FLAGS_QSIZE, val);
362
363	return val;
364}
365
366static int dw_pcie_ep_set_msi(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
367			      u8 interrupts)
368{
369	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
370	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
371	struct dw_pcie_ep_func *ep_func;
372	u32 val, reg;
 
 
373
374	ep_func = dw_pcie_ep_get_func_from_ep(ep, func_no);
375	if (!ep_func || !ep_func->msi_cap)
376		return -EINVAL;
377
378	reg = ep_func->msi_cap + PCI_MSI_FLAGS;
379	val = dw_pcie_ep_readw_dbi(ep, func_no, reg);
 
 
380	val &= ~PCI_MSI_FLAGS_QMASK;
381	val |= FIELD_PREP(PCI_MSI_FLAGS_QMASK, interrupts);
382	dw_pcie_dbi_ro_wr_en(pci);
383	dw_pcie_ep_writew_dbi(ep, func_no, reg, val);
384	dw_pcie_dbi_ro_wr_dis(pci);
385
386	return 0;
387}
388
389static int dw_pcie_ep_get_msix(struct pci_epc *epc, u8 func_no, u8 vfunc_no)
390{
391	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
392	struct dw_pcie_ep_func *ep_func;
393	u32 val, reg;
 
 
394
395	ep_func = dw_pcie_ep_get_func_from_ep(ep, func_no);
396	if (!ep_func || !ep_func->msix_cap)
397		return -EINVAL;
398
399	reg = ep_func->msix_cap + PCI_MSIX_FLAGS;
400	val = dw_pcie_ep_readw_dbi(ep, func_no, reg);
 
 
401	if (!(val & PCI_MSIX_FLAGS_ENABLE))
402		return -EINVAL;
403
404	val &= PCI_MSIX_FLAGS_QSIZE;
405
406	return val;
407}
408
409static int dw_pcie_ep_set_msix(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
410			       u16 interrupts, enum pci_barno bir, u32 offset)
411{
412	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
413	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
414	struct dw_pcie_ep_func *ep_func;
415	u32 val, reg;
 
 
416
417	ep_func = dw_pcie_ep_get_func_from_ep(ep, func_no);
418	if (!ep_func || !ep_func->msix_cap)
419		return -EINVAL;
420
421	dw_pcie_dbi_ro_wr_en(pci);
422
423	reg = ep_func->msix_cap + PCI_MSIX_FLAGS;
424	val = dw_pcie_ep_readw_dbi(ep, func_no, reg);
 
 
425	val &= ~PCI_MSIX_FLAGS_QSIZE;
426	val |= interrupts;
427	dw_pcie_writew_dbi(pci, reg, val);
428
429	reg = ep_func->msix_cap + PCI_MSIX_TABLE;
430	val = offset | bir;
431	dw_pcie_ep_writel_dbi(ep, func_no, reg, val);
432
433	reg = ep_func->msix_cap + PCI_MSIX_PBA;
434	val = (offset + (interrupts * PCI_MSIX_ENTRY_SIZE)) | bir;
435	dw_pcie_ep_writel_dbi(ep, func_no, reg, val);
436
437	dw_pcie_dbi_ro_wr_dis(pci);
438
439	return 0;
440}
441
442static int dw_pcie_ep_raise_irq(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
443				unsigned int type, u16 interrupt_num)
444{
445	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
446
447	if (!ep->ops->raise_irq)
448		return -EINVAL;
449
450	return ep->ops->raise_irq(ep, func_no, type, interrupt_num);
451}
452
453static void dw_pcie_ep_stop(struct pci_epc *epc)
454{
455	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
456	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
457
458	dw_pcie_stop_link(pci);
 
459}
460
461static int dw_pcie_ep_start(struct pci_epc *epc)
462{
463	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
464	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
465
466	return dw_pcie_start_link(pci);
 
 
 
467}
468
469static const struct pci_epc_features*
470dw_pcie_ep_get_features(struct pci_epc *epc, u8 func_no, u8 vfunc_no)
471{
472	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
473
474	if (!ep->ops->get_features)
475		return NULL;
476
477	return ep->ops->get_features(ep);
478}
479
480static const struct pci_epc_ops epc_ops = {
481	.write_header		= dw_pcie_ep_write_header,
482	.set_bar		= dw_pcie_ep_set_bar,
483	.clear_bar		= dw_pcie_ep_clear_bar,
484	.align_addr		= dw_pcie_ep_align_addr,
485	.map_addr		= dw_pcie_ep_map_addr,
486	.unmap_addr		= dw_pcie_ep_unmap_addr,
487	.set_msi		= dw_pcie_ep_set_msi,
488	.get_msi		= dw_pcie_ep_get_msi,
489	.set_msix		= dw_pcie_ep_set_msix,
490	.get_msix		= dw_pcie_ep_get_msix,
491	.raise_irq		= dw_pcie_ep_raise_irq,
492	.start			= dw_pcie_ep_start,
493	.stop			= dw_pcie_ep_stop,
494	.get_features		= dw_pcie_ep_get_features,
495};
496
497/**
498 * dw_pcie_ep_raise_intx_irq - Raise INTx IRQ to the host
499 * @ep: DWC EP device
500 * @func_no: Function number of the endpoint
501 *
502 * Return: 0 if success, errono otherwise.
503 */
504int dw_pcie_ep_raise_intx_irq(struct dw_pcie_ep *ep, u8 func_no)
505{
506	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
507	struct device *dev = pci->dev;
508
509	dev_err(dev, "EP cannot raise INTX IRQs\n");
510
511	return -EINVAL;
512}
513EXPORT_SYMBOL_GPL(dw_pcie_ep_raise_intx_irq);
514
515/**
516 * dw_pcie_ep_raise_msi_irq - Raise MSI IRQ to the host
517 * @ep: DWC EP device
518 * @func_no: Function number of the endpoint
519 * @interrupt_num: Interrupt number to be raised
520 *
521 * Return: 0 if success, errono otherwise.
522 */
523int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 func_no,
524			     u8 interrupt_num)
525{
526	u32 msg_addr_lower, msg_addr_upper, reg;
527	struct dw_pcie_ep_func *ep_func;
528	struct pci_epc *epc = ep->epc;
529	size_t map_size = sizeof(u32);
530	size_t offset;
531	u16 msg_ctrl, msg_data;
532	bool has_upper;
533	u64 msg_addr;
 
534	int ret;
535
536	ep_func = dw_pcie_ep_get_func_from_ep(ep, func_no);
537	if (!ep_func || !ep_func->msi_cap)
538		return -EINVAL;
539
 
 
540	/* Raise MSI per the PCI Local Bus Specification Revision 3.0, 6.8.1. */
541	reg = ep_func->msi_cap + PCI_MSI_FLAGS;
542	msg_ctrl = dw_pcie_ep_readw_dbi(ep, func_no, reg);
543	has_upper = !!(msg_ctrl & PCI_MSI_FLAGS_64BIT);
544	reg = ep_func->msi_cap + PCI_MSI_ADDRESS_LO;
545	msg_addr_lower = dw_pcie_ep_readl_dbi(ep, func_no, reg);
546	if (has_upper) {
547		reg = ep_func->msi_cap + PCI_MSI_ADDRESS_HI;
548		msg_addr_upper = dw_pcie_ep_readl_dbi(ep, func_no, reg);
549		reg = ep_func->msi_cap + PCI_MSI_DATA_64;
550		msg_data = dw_pcie_ep_readw_dbi(ep, func_no, reg);
551	} else {
552		msg_addr_upper = 0;
553		reg = ep_func->msi_cap + PCI_MSI_DATA_32;
554		msg_data = dw_pcie_ep_readw_dbi(ep, func_no, reg);
555	}
556	msg_addr = ((u64)msg_addr_upper) << 32 | msg_addr_lower;
557
558	msg_addr = dw_pcie_ep_align_addr(epc, msg_addr, &map_size, &offset);
559	ret = dw_pcie_ep_map_addr(epc, func_no, 0, ep->msi_mem_phys, msg_addr,
560				  map_size);
561	if (ret)
562		return ret;
563
564	writel(msg_data | (interrupt_num - 1), ep->msi_mem + offset);
565
566	dw_pcie_ep_unmap_addr(epc, func_no, 0, ep->msi_mem_phys);
567
568	return 0;
569}
570EXPORT_SYMBOL_GPL(dw_pcie_ep_raise_msi_irq);
571
572/**
573 * dw_pcie_ep_raise_msix_irq_doorbell - Raise MSI-X to the host using Doorbell
574 *					method
575 * @ep: DWC EP device
576 * @func_no: Function number of the endpoint device
577 * @interrupt_num: Interrupt number to be raised
578 *
579 * Return: 0 if success, errno otherwise.
580 */
581int dw_pcie_ep_raise_msix_irq_doorbell(struct dw_pcie_ep *ep, u8 func_no,
582				       u16 interrupt_num)
583{
584	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
585	struct dw_pcie_ep_func *ep_func;
586	u32 msg_data;
587
588	ep_func = dw_pcie_ep_get_func_from_ep(ep, func_no);
589	if (!ep_func || !ep_func->msix_cap)
590		return -EINVAL;
591
592	msg_data = (func_no << PCIE_MSIX_DOORBELL_PF_SHIFT) |
593		   (interrupt_num - 1);
594
595	dw_pcie_writel_dbi(pci, PCIE_MSIX_DOORBELL, msg_data);
596
597	return 0;
598}
599
600/**
601 * dw_pcie_ep_raise_msix_irq - Raise MSI-X to the host
602 * @ep: DWC EP device
603 * @func_no: Function number of the endpoint device
604 * @interrupt_num: Interrupt number to be raised
605 *
606 * Return: 0 if success, errno otherwise.
607 */
608int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no,
609			      u16 interrupt_num)
610{
611	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
612	struct pci_epf_msix_tbl *msix_tbl;
613	struct dw_pcie_ep_func *ep_func;
 
614	struct pci_epc *epc = ep->epc;
615	size_t map_size = sizeof(u32);
616	size_t offset;
617	u32 reg, msg_data, vec_ctrl;
 
618	u32 tbl_offset;
619	u64 msg_addr;
620	int ret;
621	u8 bir;
622
623	ep_func = dw_pcie_ep_get_func_from_ep(ep, func_no);
624	if (!ep_func || !ep_func->msix_cap)
625		return -EINVAL;
626
627	reg = ep_func->msix_cap + PCI_MSIX_TABLE;
628	tbl_offset = dw_pcie_ep_readl_dbi(ep, func_no, reg);
629	bir = FIELD_GET(PCI_MSIX_TABLE_BIR, tbl_offset);
 
 
630	tbl_offset &= PCI_MSIX_TABLE_OFFSET;
631
632	msix_tbl = ep->epf_bar[bir]->addr + tbl_offset;
633	msg_addr = msix_tbl[(interrupt_num - 1)].msg_addr;
634	msg_data = msix_tbl[(interrupt_num - 1)].msg_data;
635	vec_ctrl = msix_tbl[(interrupt_num - 1)].vector_ctrl;
636
637	if (vec_ctrl & PCI_MSIX_ENTRY_CTRL_MASKBIT) {
638		dev_dbg(pci->dev, "MSI-X entry ctrl set\n");
639		return -EPERM;
640	}
641
642	msg_addr = dw_pcie_ep_align_addr(epc, msg_addr, &map_size, &offset);
643	ret = dw_pcie_ep_map_addr(epc, func_no, 0, ep->msi_mem_phys, msg_addr,
644				  map_size);
645	if (ret)
646		return ret;
647
648	writel(msg_data, ep->msi_mem + offset);
649
650	dw_pcie_ep_unmap_addr(epc, func_no, 0, ep->msi_mem_phys);
651
652	return 0;
653}
654
655/**
656 * dw_pcie_ep_cleanup - Cleanup DWC EP resources after fundamental reset
657 * @ep: DWC EP device
658 *
659 * Cleans up the DWC EP specific resources like eDMA etc... after fundamental
660 * reset like PERST#. Note that this API is only applicable for drivers
661 * supporting PERST# or any other methods of fundamental reset.
662 */
663void dw_pcie_ep_cleanup(struct dw_pcie_ep *ep)
664{
665	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
666
667	dw_pcie_edma_remove(pci);
668}
669EXPORT_SYMBOL_GPL(dw_pcie_ep_cleanup);
670
671/**
672 * dw_pcie_ep_deinit - Deinitialize the endpoint device
673 * @ep: DWC EP device
674 *
675 * Deinitialize the endpoint device. EPC device is not destroyed since that will
676 * be taken care by Devres.
677 */
678void dw_pcie_ep_deinit(struct dw_pcie_ep *ep)
679{
680	struct pci_epc *epc = ep->epc;
681
682	dw_pcie_ep_cleanup(ep);
683
684	pci_epc_mem_free_addr(epc, ep->msi_mem_phys, ep->msi_mem,
685			      epc->mem->window.page_size);
686
687	pci_epc_mem_exit(epc);
688}
689EXPORT_SYMBOL_GPL(dw_pcie_ep_deinit);
690
691static unsigned int dw_pcie_ep_find_ext_capability(struct dw_pcie *pci, int cap)
692{
693	u32 header;
694	int pos = PCI_CFG_SPACE_SIZE;
695
696	while (pos) {
697		header = dw_pcie_readl_dbi(pci, pos);
698		if (PCI_EXT_CAP_ID(header) == cap)
699			return pos;
700
701		pos = PCI_EXT_CAP_NEXT(header);
702		if (!pos)
703			break;
704	}
705
706	return 0;
707}
708
709static void dw_pcie_ep_init_non_sticky_registers(struct dw_pcie *pci)
710{
 
711	unsigned int offset;
712	unsigned int nbars;
713	u32 reg, i;
714
715	offset = dw_pcie_ep_find_ext_capability(pci, PCI_EXT_CAP_ID_REBAR);
716
717	dw_pcie_dbi_ro_wr_en(pci);
718
719	if (offset) {
720		reg = dw_pcie_readl_dbi(pci, offset + PCI_REBAR_CTRL);
721		nbars = (reg & PCI_REBAR_CTRL_NBAR_MASK) >>
722			PCI_REBAR_CTRL_NBAR_SHIFT;
723
724		/*
725		 * PCIe r6.0, sec 7.8.6.2 require us to support at least one
726		 * size in the range from 1 MB to 512 GB. Advertise support
727		 * for 1 MB BAR size only.
728		 */
729		for (i = 0; i < nbars; i++, offset += PCI_REBAR_CTRL)
730			dw_pcie_writel_dbi(pci, offset + PCI_REBAR_CAP, BIT(4));
731	}
732
733	dw_pcie_setup(pci);
734	dw_pcie_dbi_ro_wr_dis(pci);
735}
736
737/**
738 * dw_pcie_ep_init_registers - Initialize DWC EP specific registers
739 * @ep: DWC EP device
740 *
741 * Initialize the registers (CSRs) specific to DWC EP. This API should be called
742 * only when the endpoint receives an active refclk (either from host or
743 * generated locally).
744 */
745int dw_pcie_ep_init_registers(struct dw_pcie_ep *ep)
746{
747	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
748	struct dw_pcie_ep_func *ep_func;
749	struct device *dev = pci->dev;
750	struct pci_epc *epc = ep->epc;
751	u32 ptm_cap_base, reg;
752	u8 hdr_type;
753	u8 func_no;
754	void *addr;
755	int ret;
756
757	hdr_type = dw_pcie_readb_dbi(pci, PCI_HEADER_TYPE) &
758		   PCI_HEADER_TYPE_MASK;
759	if (hdr_type != PCI_HEADER_TYPE_NORMAL) {
760		dev_err(pci->dev,
761			"PCIe controller is not set to EP mode (hdr_type:0x%x)!\n",
762			hdr_type);
763		return -EIO;
764	}
765
766	dw_pcie_version_detect(pci);
767
768	dw_pcie_iatu_detect(pci);
769
770	ret = dw_pcie_edma_detect(pci);
771	if (ret)
772		return ret;
773
774	if (!ep->ib_window_map) {
775		ep->ib_window_map = devm_bitmap_zalloc(dev, pci->num_ib_windows,
776						       GFP_KERNEL);
777		if (!ep->ib_window_map)
778			goto err_remove_edma;
779	}
780
781	if (!ep->ob_window_map) {
782		ep->ob_window_map = devm_bitmap_zalloc(dev, pci->num_ob_windows,
783						       GFP_KERNEL);
784		if (!ep->ob_window_map)
785			goto err_remove_edma;
786	}
787
788	if (!ep->outbound_addr) {
789		addr = devm_kcalloc(dev, pci->num_ob_windows, sizeof(phys_addr_t),
790				    GFP_KERNEL);
791		if (!addr)
792			goto err_remove_edma;
793		ep->outbound_addr = addr;
794	}
795
796	for (func_no = 0; func_no < epc->max_functions; func_no++) {
797
798		ep_func = dw_pcie_ep_get_func_from_ep(ep, func_no);
799		if (ep_func)
800			continue;
801
802		ep_func = devm_kzalloc(dev, sizeof(*ep_func), GFP_KERNEL);
803		if (!ep_func)
804			goto err_remove_edma;
805
806		ep_func->func_no = func_no;
807		ep_func->msi_cap = dw_pcie_ep_find_capability(ep, func_no,
808							      PCI_CAP_ID_MSI);
809		ep_func->msix_cap = dw_pcie_ep_find_capability(ep, func_no,
810							       PCI_CAP_ID_MSIX);
811
812		list_add_tail(&ep_func->list, &ep->func_list);
813	}
814
815	if (ep->ops->init)
816		ep->ops->init(ep);
817
818	ptm_cap_base = dw_pcie_ep_find_ext_capability(pci, PCI_EXT_CAP_ID_PTM);
819
820	/*
821	 * PTM responder capability can be disabled only after disabling
822	 * PTM root capability.
823	 */
824	if (ptm_cap_base) {
825		dw_pcie_dbi_ro_wr_en(pci);
826		reg = dw_pcie_readl_dbi(pci, ptm_cap_base + PCI_PTM_CAP);
827		reg &= ~PCI_PTM_CAP_ROOT;
828		dw_pcie_writel_dbi(pci, ptm_cap_base + PCI_PTM_CAP, reg);
829
830		reg = dw_pcie_readl_dbi(pci, ptm_cap_base + PCI_PTM_CAP);
831		reg &= ~(PCI_PTM_CAP_RES | PCI_PTM_GRANULARITY_MASK);
832		dw_pcie_writel_dbi(pci, ptm_cap_base + PCI_PTM_CAP, reg);
833		dw_pcie_dbi_ro_wr_dis(pci);
834	}
835
836	dw_pcie_ep_init_non_sticky_registers(pci);
 
837
838	return 0;
839
840err_remove_edma:
841	dw_pcie_edma_remove(pci);
842
843	return ret;
844}
845EXPORT_SYMBOL_GPL(dw_pcie_ep_init_registers);
846
847/**
848 * dw_pcie_ep_linkup - Notify EPF drivers about Link Up event
849 * @ep: DWC EP device
850 */
851void dw_pcie_ep_linkup(struct dw_pcie_ep *ep)
852{
853	struct pci_epc *epc = ep->epc;
854
855	pci_epc_linkup(epc);
856}
857EXPORT_SYMBOL_GPL(dw_pcie_ep_linkup);
858
859/**
860 * dw_pcie_ep_linkdown - Notify EPF drivers about Link Down event
861 * @ep: DWC EP device
862 *
863 * Non-sticky registers are also initialized before sending the notification to
864 * the EPF drivers. This is needed since the registers need to be initialized
865 * before the link comes back again.
866 */
867void dw_pcie_ep_linkdown(struct dw_pcie_ep *ep)
868{
869	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
870	struct pci_epc *epc = ep->epc;
871
872	/*
873	 * Initialize the non-sticky DWC registers as they would've reset post
874	 * Link Down. This is specifically needed for drivers not supporting
875	 * PERST# as they have no way to reinitialize the registers before the
876	 * link comes back again.
877	 */
878	dw_pcie_ep_init_non_sticky_registers(pci);
879
880	pci_epc_linkdown(epc);
881}
882EXPORT_SYMBOL_GPL(dw_pcie_ep_linkdown);
883
884/**
885 * dw_pcie_ep_init - Initialize the endpoint device
886 * @ep: DWC EP device
887 *
888 * Initialize the endpoint device. Allocate resources and create the EPC
889 * device with the endpoint framework.
890 *
891 * Return: 0 if success, errno otherwise.
892 */
893int dw_pcie_ep_init(struct dw_pcie_ep *ep)
894{
895	int ret;
 
 
896	struct resource *res;
897	struct pci_epc *epc;
898	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
899	struct device *dev = pci->dev;
900	struct platform_device *pdev = to_platform_device(dev);
901	struct device_node *np = dev->of_node;
 
 
902
903	INIT_LIST_HEAD(&ep->func_list);
904
905	ret = dw_pcie_get_resources(pci);
906	if (ret)
907		return ret;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
908
909	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
910	if (!res)
911		return -EINVAL;
912
913	ep->phys_base = res->start;
914	ep->addr_size = resource_size(res);
915
916	if (ep->ops->pre_init)
917		ep->ops->pre_init(ep);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
918
919	epc = devm_pci_epc_create(dev, &epc_ops);
920	if (IS_ERR(epc)) {
921		dev_err(dev, "Failed to create epc device\n");
922		return PTR_ERR(epc);
923	}
924
925	ep->epc = epc;
926	epc_set_drvdata(epc, ep);
927
928	ret = of_property_read_u8(np, "max-functions", &epc->max_functions);
929	if (ret < 0)
930		epc->max_functions = 1;
931
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
932	ret = pci_epc_mem_init(epc, ep->phys_base, ep->addr_size,
933			       ep->page_size);
934	if (ret < 0) {
935		dev_err(dev, "Failed to initialize address space\n");
936		return ret;
937	}
938
939	ep->msi_mem = pci_epc_mem_alloc_addr(epc, &ep->msi_mem_phys,
940					     epc->mem->window.page_size);
941	if (!ep->msi_mem) {
942		ret = -ENOMEM;
943		dev_err(dev, "Failed to reserve memory for MSI/MSI-X\n");
944		goto err_exit_epc_mem;
945	}
946
947	return 0;
948
949err_exit_epc_mem:
950	pci_epc_mem_exit(epc);
 
951
952	return ret;
953}
954EXPORT_SYMBOL_GPL(dw_pcie_ep_init);