1 // SPDX-License-Identifier: GPL-2.0
3 * Synopsys DesignWare PCIe Endpoint controller driver
5 * Copyright (C) 2017 Texas Instruments
6 * Author: Kishon Vijay Abraham I <kishon@ti.com>
11 #include "pcie-designware.h"
12 #include <linux/pci-epc.h>
13 #include <linux/pci-epf.h>
15 void dw_pcie_ep_linkup(struct dw_pcie_ep *ep)
17 struct pci_epc *epc = ep->epc;
21 EXPORT_SYMBOL_GPL(dw_pcie_ep_linkup);
23 void dw_pcie_ep_init_notify(struct dw_pcie_ep *ep)
25 struct pci_epc *epc = ep->epc;
27 pci_epc_init_notify(epc);
29 EXPORT_SYMBOL_GPL(dw_pcie_ep_init_notify);
31 static void __dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar,
36 reg = PCI_BASE_ADDRESS_0 + (4 * bar);
37 dw_pcie_dbi_ro_wr_en(pci);
38 dw_pcie_writel_dbi2(pci, reg, 0x0);
39 dw_pcie_writel_dbi(pci, reg, 0x0);
40 if (flags & PCI_BASE_ADDRESS_MEM_TYPE_64) {
41 dw_pcie_writel_dbi2(pci, reg + 4, 0x0);
42 dw_pcie_writel_dbi(pci, reg + 4, 0x0);
44 dw_pcie_dbi_ro_wr_dis(pci);
47 void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar)
49 __dw_pcie_ep_reset_bar(pci, bar, 0);
52 static int dw_pcie_ep_write_header(struct pci_epc *epc, u8 func_no,
53 struct pci_epf_header *hdr)
55 struct dw_pcie_ep *ep = epc_get_drvdata(epc);
56 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
58 dw_pcie_dbi_ro_wr_en(pci);
59 dw_pcie_writew_dbi(pci, PCI_VENDOR_ID, hdr->vendorid);
60 dw_pcie_writew_dbi(pci, PCI_DEVICE_ID, hdr->deviceid);
61 dw_pcie_writeb_dbi(pci, PCI_REVISION_ID, hdr->revid);
62 dw_pcie_writeb_dbi(pci, PCI_CLASS_PROG, hdr->progif_code);
63 dw_pcie_writew_dbi(pci, PCI_CLASS_DEVICE,
64 hdr->subclass_code | hdr->baseclass_code << 8);
65 dw_pcie_writeb_dbi(pci, PCI_CACHE_LINE_SIZE,
66 hdr->cache_line_size);
67 dw_pcie_writew_dbi(pci, PCI_SUBSYSTEM_VENDOR_ID,
68 hdr->subsys_vendor_id);
69 dw_pcie_writew_dbi(pci, PCI_SUBSYSTEM_ID, hdr->subsys_id);
70 dw_pcie_writeb_dbi(pci, PCI_INTERRUPT_PIN,
72 dw_pcie_dbi_ro_wr_dis(pci);
77 static int dw_pcie_ep_inbound_atu(struct dw_pcie_ep *ep, enum pci_barno bar,
79 enum dw_pcie_as_type as_type)
83 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
85 free_win = find_first_zero_bit(ep->ib_window_map, ep->num_ib_windows);
86 if (free_win >= ep->num_ib_windows) {
87 dev_err(pci->dev, "No free inbound window\n");
91 ret = dw_pcie_prog_inbound_atu(pci, free_win, bar, cpu_addr,
94 dev_err(pci->dev, "Failed to program IB window\n");
98 ep->bar_to_atu[bar] = free_win;
99 set_bit(free_win, ep->ib_window_map);
104 static int dw_pcie_ep_outbound_atu(struct dw_pcie_ep *ep, phys_addr_t phys_addr,
105 u64 pci_addr, size_t size)
108 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
110 free_win = find_first_zero_bit(ep->ob_window_map, ep->num_ob_windows);
111 if (free_win >= ep->num_ob_windows) {
112 dev_err(pci->dev, "No free outbound window\n");
116 dw_pcie_prog_outbound_atu(pci, free_win, PCIE_ATU_TYPE_MEM,
117 phys_addr, pci_addr, size);
119 set_bit(free_win, ep->ob_window_map);
120 ep->outbound_addr[free_win] = phys_addr;
125 static void dw_pcie_ep_clear_bar(struct pci_epc *epc, u8 func_no,
126 struct pci_epf_bar *epf_bar)
128 struct dw_pcie_ep *ep = epc_get_drvdata(epc);
129 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
130 enum pci_barno bar = epf_bar->barno;
131 u32 atu_index = ep->bar_to_atu[bar];
133 __dw_pcie_ep_reset_bar(pci, bar, epf_bar->flags);
135 dw_pcie_disable_atu(pci, atu_index, DW_PCIE_REGION_INBOUND);
136 clear_bit(atu_index, ep->ib_window_map);
139 static int dw_pcie_ep_set_bar(struct pci_epc *epc, u8 func_no,
140 struct pci_epf_bar *epf_bar)
143 struct dw_pcie_ep *ep = epc_get_drvdata(epc);
144 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
145 enum pci_barno bar = epf_bar->barno;
146 size_t size = epf_bar->size;
147 int flags = epf_bar->flags;
148 enum dw_pcie_as_type as_type;
149 u32 reg = PCI_BASE_ADDRESS_0 + (4 * bar);
151 if (!(flags & PCI_BASE_ADDRESS_SPACE))
152 as_type = DW_PCIE_AS_MEM;
154 as_type = DW_PCIE_AS_IO;
156 ret = dw_pcie_ep_inbound_atu(ep, bar, epf_bar->phys_addr, as_type);
160 dw_pcie_dbi_ro_wr_en(pci);
162 dw_pcie_writel_dbi2(pci, reg, lower_32_bits(size - 1));
163 dw_pcie_writel_dbi(pci, reg, flags);
165 if (flags & PCI_BASE_ADDRESS_MEM_TYPE_64) {
166 dw_pcie_writel_dbi2(pci, reg + 4, upper_32_bits(size - 1));
167 dw_pcie_writel_dbi(pci, reg + 4, 0);
170 dw_pcie_dbi_ro_wr_dis(pci);
175 static int dw_pcie_find_index(struct dw_pcie_ep *ep, phys_addr_t addr,
180 for (index = 0; index < ep->num_ob_windows; index++) {
181 if (ep->outbound_addr[index] != addr)
190 static void dw_pcie_ep_unmap_addr(struct pci_epc *epc, u8 func_no,
195 struct dw_pcie_ep *ep = epc_get_drvdata(epc);
196 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
198 ret = dw_pcie_find_index(ep, addr, &atu_index);
202 dw_pcie_disable_atu(pci, atu_index, DW_PCIE_REGION_OUTBOUND);
203 clear_bit(atu_index, ep->ob_window_map);
206 static int dw_pcie_ep_map_addr(struct pci_epc *epc, u8 func_no,
208 u64 pci_addr, size_t size)
211 struct dw_pcie_ep *ep = epc_get_drvdata(epc);
212 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
214 ret = dw_pcie_ep_outbound_atu(ep, addr, pci_addr, size);
216 dev_err(pci->dev, "Failed to enable address\n");
223 static int dw_pcie_ep_get_msi(struct pci_epc *epc, u8 func_no)
225 struct dw_pcie_ep *ep = epc_get_drvdata(epc);
226 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
232 reg = ep->msi_cap + PCI_MSI_FLAGS;
233 val = dw_pcie_readw_dbi(pci, reg);
234 if (!(val & PCI_MSI_FLAGS_ENABLE))
237 val = (val & PCI_MSI_FLAGS_QSIZE) >> 4;
242 static int dw_pcie_ep_set_msi(struct pci_epc *epc, u8 func_no, u8 interrupts)
244 struct dw_pcie_ep *ep = epc_get_drvdata(epc);
245 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
251 reg = ep->msi_cap + PCI_MSI_FLAGS;
252 val = dw_pcie_readw_dbi(pci, reg);
253 val &= ~PCI_MSI_FLAGS_QMASK;
254 val |= (interrupts << 1) & PCI_MSI_FLAGS_QMASK;
255 dw_pcie_dbi_ro_wr_en(pci);
256 dw_pcie_writew_dbi(pci, reg, val);
257 dw_pcie_dbi_ro_wr_dis(pci);
262 static int dw_pcie_ep_get_msix(struct pci_epc *epc, u8 func_no)
264 struct dw_pcie_ep *ep = epc_get_drvdata(epc);
265 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
271 reg = ep->msix_cap + PCI_MSIX_FLAGS;
272 val = dw_pcie_readw_dbi(pci, reg);
273 if (!(val & PCI_MSIX_FLAGS_ENABLE))
276 val &= PCI_MSIX_FLAGS_QSIZE;
281 static int dw_pcie_ep_set_msix(struct pci_epc *epc, u8 func_no, u16 interrupts,
282 enum pci_barno bir, u32 offset)
284 struct dw_pcie_ep *ep = epc_get_drvdata(epc);
285 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
291 dw_pcie_dbi_ro_wr_en(pci);
293 reg = ep->msix_cap + PCI_MSIX_FLAGS;
294 val = dw_pcie_readw_dbi(pci, reg);
295 val &= ~PCI_MSIX_FLAGS_QSIZE;
297 dw_pcie_writew_dbi(pci, reg, val);
299 reg = ep->msix_cap + PCI_MSIX_TABLE;
301 dw_pcie_writel_dbi(pci, reg, val);
303 reg = ep->msix_cap + PCI_MSIX_PBA;
304 val = (offset + (interrupts * PCI_MSIX_ENTRY_SIZE)) | bir;
305 dw_pcie_writel_dbi(pci, reg, val);
307 dw_pcie_dbi_ro_wr_dis(pci);
312 static int dw_pcie_ep_raise_irq(struct pci_epc *epc, u8 func_no,
313 enum pci_epc_irq_type type, u16 interrupt_num)
315 struct dw_pcie_ep *ep = epc_get_drvdata(epc);
317 if (!ep->ops->raise_irq)
320 return ep->ops->raise_irq(ep, func_no, type, interrupt_num);
323 static void dw_pcie_ep_stop(struct pci_epc *epc)
325 struct dw_pcie_ep *ep = epc_get_drvdata(epc);
326 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
328 if (!pci->ops->stop_link)
331 pci->ops->stop_link(pci);
334 static int dw_pcie_ep_start(struct pci_epc *epc)
336 struct dw_pcie_ep *ep = epc_get_drvdata(epc);
337 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
339 if (!pci->ops->start_link)
342 return pci->ops->start_link(pci);
345 static const struct pci_epc_features*
346 dw_pcie_ep_get_features(struct pci_epc *epc, u8 func_no)
348 struct dw_pcie_ep *ep = epc_get_drvdata(epc);
350 if (!ep->ops->get_features)
353 return ep->ops->get_features(ep);
356 static const struct pci_epc_ops epc_ops = {
357 .write_header = dw_pcie_ep_write_header,
358 .set_bar = dw_pcie_ep_set_bar,
359 .clear_bar = dw_pcie_ep_clear_bar,
360 .map_addr = dw_pcie_ep_map_addr,
361 .unmap_addr = dw_pcie_ep_unmap_addr,
362 .set_msi = dw_pcie_ep_set_msi,
363 .get_msi = dw_pcie_ep_get_msi,
364 .set_msix = dw_pcie_ep_set_msix,
365 .get_msix = dw_pcie_ep_get_msix,
366 .raise_irq = dw_pcie_ep_raise_irq,
367 .start = dw_pcie_ep_start,
368 .stop = dw_pcie_ep_stop,
369 .get_features = dw_pcie_ep_get_features,
372 int dw_pcie_ep_raise_legacy_irq(struct dw_pcie_ep *ep, u8 func_no)
374 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
375 struct device *dev = pci->dev;
377 dev_err(dev, "EP cannot trigger legacy IRQs\n");
382 int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 func_no,
385 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
386 struct pci_epc *epc = ep->epc;
387 unsigned int aligned_offset;
388 u16 msg_ctrl, msg_data;
389 u32 msg_addr_lower, msg_addr_upper, reg;
397 /* Raise MSI per the PCI Local Bus Specification Revision 3.0, 6.8.1. */
398 reg = ep->msi_cap + PCI_MSI_FLAGS;
399 msg_ctrl = dw_pcie_readw_dbi(pci, reg);
400 has_upper = !!(msg_ctrl & PCI_MSI_FLAGS_64BIT);
401 reg = ep->msi_cap + PCI_MSI_ADDRESS_LO;
402 msg_addr_lower = dw_pcie_readl_dbi(pci, reg);
404 reg = ep->msi_cap + PCI_MSI_ADDRESS_HI;
405 msg_addr_upper = dw_pcie_readl_dbi(pci, reg);
406 reg = ep->msi_cap + PCI_MSI_DATA_64;
407 msg_data = dw_pcie_readw_dbi(pci, reg);
410 reg = ep->msi_cap + PCI_MSI_DATA_32;
411 msg_data = dw_pcie_readw_dbi(pci, reg);
413 aligned_offset = msg_addr_lower & (epc->mem->page_size - 1);
414 msg_addr = ((u64)msg_addr_upper) << 32 |
415 (msg_addr_lower & ~aligned_offset);
416 ret = dw_pcie_ep_map_addr(epc, func_no, ep->msi_mem_phys, msg_addr,
417 epc->mem->page_size);
421 writel(msg_data | (interrupt_num - 1), ep->msi_mem + aligned_offset);
423 dw_pcie_ep_unmap_addr(epc, func_no, ep->msi_mem_phys);
428 int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no,
431 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
432 struct pci_epc *epc = ep->epc;
434 u32 bar_addr_upper, bar_addr_lower;
435 u32 msg_addr_upper, msg_addr_lower;
436 u32 reg, msg_data, vec_ctrl;
437 u64 tbl_addr, msg_addr, reg_u64;
438 void __iomem *msix_tbl;
441 reg = ep->msix_cap + PCI_MSIX_TABLE;
442 tbl_offset = dw_pcie_readl_dbi(pci, reg);
443 bir = (tbl_offset & PCI_MSIX_TABLE_BIR);
444 tbl_offset &= PCI_MSIX_TABLE_OFFSET;
446 reg = PCI_BASE_ADDRESS_0 + (4 * bir);
448 bar_addr_lower = dw_pcie_readl_dbi(pci, reg);
449 reg_u64 = (bar_addr_lower & PCI_BASE_ADDRESS_MEM_TYPE_MASK);
450 if (reg_u64 == PCI_BASE_ADDRESS_MEM_TYPE_64)
451 bar_addr_upper = dw_pcie_readl_dbi(pci, reg + 4);
453 tbl_addr = ((u64) bar_addr_upper) << 32 | bar_addr_lower;
454 tbl_addr += (tbl_offset + ((interrupt_num - 1) * PCI_MSIX_ENTRY_SIZE));
455 tbl_addr &= PCI_BASE_ADDRESS_MEM_MASK;
457 msix_tbl = ioremap(ep->phys_base + tbl_addr,
458 PCI_MSIX_ENTRY_SIZE);
462 msg_addr_lower = readl(msix_tbl + PCI_MSIX_ENTRY_LOWER_ADDR);
463 msg_addr_upper = readl(msix_tbl + PCI_MSIX_ENTRY_UPPER_ADDR);
464 msg_addr = ((u64) msg_addr_upper) << 32 | msg_addr_lower;
465 msg_data = readl(msix_tbl + PCI_MSIX_ENTRY_DATA);
466 vec_ctrl = readl(msix_tbl + PCI_MSIX_ENTRY_VECTOR_CTRL);
470 if (vec_ctrl & PCI_MSIX_ENTRY_CTRL_MASKBIT) {
471 dev_dbg(pci->dev, "MSI-X entry ctrl set\n");
475 ret = dw_pcie_ep_map_addr(epc, func_no, ep->msi_mem_phys, msg_addr,
476 epc->mem->page_size);
480 writel(msg_data, ep->msi_mem);
482 dw_pcie_ep_unmap_addr(epc, func_no, ep->msi_mem_phys);
487 void dw_pcie_ep_exit(struct dw_pcie_ep *ep)
489 struct pci_epc *epc = ep->epc;
491 pci_epc_mem_free_addr(epc, ep->msi_mem_phys, ep->msi_mem,
492 epc->mem->page_size);
494 pci_epc_mem_exit(epc);
497 static unsigned int dw_pcie_ep_find_ext_capability(struct dw_pcie *pci, int cap)
500 int pos = PCI_CFG_SPACE_SIZE;
503 header = dw_pcie_readl_dbi(pci, pos);
504 if (PCI_EXT_CAP_ID(header) == cap)
507 pos = PCI_EXT_CAP_NEXT(header);
515 int dw_pcie_ep_init_complete(struct dw_pcie_ep *ep)
517 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
524 hdr_type = dw_pcie_readb_dbi(pci, PCI_HEADER_TYPE);
525 if (hdr_type != PCI_HEADER_TYPE_NORMAL) {
527 "PCIe controller is not set to EP mode (hdr_type:0x%x)!\n",
532 ep->msi_cap = dw_pcie_find_capability(pci, PCI_CAP_ID_MSI);
534 ep->msix_cap = dw_pcie_find_capability(pci, PCI_CAP_ID_MSIX);
536 offset = dw_pcie_ep_find_ext_capability(pci, PCI_EXT_CAP_ID_REBAR);
538 reg = dw_pcie_readl_dbi(pci, offset + PCI_REBAR_CTRL);
539 nbars = (reg & PCI_REBAR_CTRL_NBAR_MASK) >>
540 PCI_REBAR_CTRL_NBAR_SHIFT;
542 dw_pcie_dbi_ro_wr_en(pci);
543 for (i = 0; i < nbars; i++, offset += PCI_REBAR_CTRL)
544 dw_pcie_writel_dbi(pci, offset + PCI_REBAR_CAP, 0x0);
545 dw_pcie_dbi_ro_wr_dis(pci);
552 EXPORT_SYMBOL_GPL(dw_pcie_ep_init_complete);
554 int dw_pcie_ep_init(struct dw_pcie_ep *ep)
559 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
560 struct device *dev = pci->dev;
561 struct device_node *np = dev->of_node;
562 const struct pci_epc_features *epc_features;
564 if (!pci->dbi_base || !pci->dbi_base2) {
565 dev_err(dev, "dbi_base/dbi_base2 is not populated\n");
569 ret = of_property_read_u32(np, "num-ib-windows", &ep->num_ib_windows);
571 dev_err(dev, "Unable to read *num-ib-windows* property\n");
574 if (ep->num_ib_windows > MAX_IATU_IN) {
575 dev_err(dev, "Invalid *num-ib-windows*\n");
579 ret = of_property_read_u32(np, "num-ob-windows", &ep->num_ob_windows);
581 dev_err(dev, "Unable to read *num-ob-windows* property\n");
584 if (ep->num_ob_windows > MAX_IATU_OUT) {
585 dev_err(dev, "Invalid *num-ob-windows*\n");
589 ep->ib_window_map = devm_kcalloc(dev,
590 BITS_TO_LONGS(ep->num_ib_windows),
593 if (!ep->ib_window_map)
596 ep->ob_window_map = devm_kcalloc(dev,
597 BITS_TO_LONGS(ep->num_ob_windows),
600 if (!ep->ob_window_map)
603 addr = devm_kcalloc(dev, ep->num_ob_windows, sizeof(phys_addr_t),
607 ep->outbound_addr = addr;
609 epc = devm_pci_epc_create(dev, &epc_ops);
611 dev_err(dev, "Failed to create epc device\n");
616 epc_set_drvdata(epc, ep);
618 if (ep->ops->ep_init)
619 ep->ops->ep_init(ep);
621 ret = of_property_read_u8(np, "max-functions", &epc->max_functions);
623 epc->max_functions = 1;
625 ret = __pci_epc_mem_init(epc, ep->phys_base, ep->addr_size,
628 dev_err(dev, "Failed to initialize address space\n");
632 ep->msi_mem = pci_epc_mem_alloc_addr(epc, &ep->msi_mem_phys,
633 epc->mem->page_size);
635 dev_err(dev, "Failed to reserve memory for MSI/MSI-X\n");
639 if (ep->ops->get_features) {
640 epc_features = ep->ops->get_features(ep);
641 if (epc_features->core_init_notifier)
645 return dw_pcie_ep_init_complete(ep);
647 EXPORT_SYMBOL_GPL(dw_pcie_ep_init);