1 // SPDX-License-Identifier: GPL-2.0+
4 * Written by Ramon Fried <ramon.fried@gmail.com>
11 #include <linux/sizes.h>
12 #include <linux/log2.h>
13 #include "pcie-cadence.h"
15 DECLARE_GLOBAL_DATA_PTR;
17 static int cdns_write_header(struct udevice *dev, uint fn,
18 struct pci_ep_header *hdr)
20 struct cdns_pcie *pcie = dev_get_priv(dev);
22 cdns_pcie_ep_fn_writew(pcie, fn, PCI_DEVICE_ID, hdr->deviceid);
23 cdns_pcie_ep_fn_writeb(pcie, fn, PCI_REVISION_ID, hdr->revid);
24 cdns_pcie_ep_fn_writeb(pcie, fn, PCI_CLASS_PROG,
26 cdns_pcie_ep_fn_writew(pcie, fn, PCI_CLASS_DEVICE,
28 hdr->baseclass_code << 8);
29 cdns_pcie_ep_fn_writeb(pcie, fn, PCI_CACHE_LINE_SIZE,
30 hdr->cache_line_size);
31 cdns_pcie_ep_fn_writew(pcie, fn, PCI_SUBSYSTEM_ID,
33 cdns_pcie_ep_fn_writeb(pcie, fn, PCI_INTERRUPT_PIN,
37 * Vendor ID can only be modified from function 0, all other functions
38 * use the same vendor ID as function 0.
41 /* Update the vendor IDs. */
42 u32 id = CDNS_PCIE_LM_ID_VENDOR(hdr->vendorid) |
43 CDNS_PCIE_LM_ID_SUBSYS(hdr->subsys_vendor_id);
45 cdns_pcie_writel(pcie, CDNS_PCIE_LM_ID, id);
51 static int cdns_set_bar(struct udevice *dev, uint fn, struct pci_bar *ep_bar)
53 struct cdns_pcie *pcie = dev_get_priv(dev);
54 dma_addr_t bar_phys = ep_bar->phys_addr;
55 enum pci_barno bar = ep_bar->barno;
56 int flags = ep_bar->flags;
57 u32 addr0, addr1, reg, cfg, b, aperture, ctrl;
60 /* BAR size is 2^(aperture + 7) */
61 sz = max_t(size_t, ep_bar->size, CDNS_PCIE_EP_MIN_APERTURE);
63 * roundup_pow_of_two() returns an unsigned long, which is not suited
66 sz = 1ULL << fls64(sz - 1);
67 aperture = ilog2(sz) - 7; /* 128B -> 0, 256B -> 1, 512B -> 2, ... */
69 if ((flags & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) {
70 ctrl = CDNS_PCIE_LM_BAR_CFG_CTRL_IO_32BITS;
72 bool is_prefetch = !!(flags & PCI_BASE_ADDRESS_MEM_PREFETCH);
73 bool is_64bits = (sz > SZ_2G) |
74 !!(ep_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64);
76 if (is_64bits && (bar & 1))
79 if (is_64bits && !(flags & PCI_BASE_ADDRESS_MEM_TYPE_64))
80 ep_bar->flags |= PCI_BASE_ADDRESS_MEM_TYPE_64;
82 if (is_64bits && is_prefetch)
83 ctrl = CDNS_PCIE_LM_BAR_CFG_CTRL_PREFETCH_MEM_64BITS;
85 ctrl = CDNS_PCIE_LM_BAR_CFG_CTRL_PREFETCH_MEM_32BITS;
87 ctrl = CDNS_PCIE_LM_BAR_CFG_CTRL_MEM_64BITS;
89 ctrl = CDNS_PCIE_LM_BAR_CFG_CTRL_MEM_32BITS;
92 addr0 = lower_32_bits(bar_phys);
93 addr1 = upper_32_bits(bar_phys);
94 cdns_pcie_writel(pcie, CDNS_PCIE_AT_IB_EP_FUNC_BAR_ADDR0(fn, bar),
96 cdns_pcie_writel(pcie, CDNS_PCIE_AT_IB_EP_FUNC_BAR_ADDR1(fn, bar),
100 reg = CDNS_PCIE_LM_EP_FUNC_BAR_CFG0(fn);
103 reg = CDNS_PCIE_LM_EP_FUNC_BAR_CFG1(fn);
107 cfg = cdns_pcie_readl(pcie, reg);
108 cfg &= ~(CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_APERTURE_MASK(b) |
109 CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_CTRL_MASK(b));
110 cfg |= (CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_APERTURE(b, aperture) |
111 CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_CTRL(b, ctrl));
112 cdns_pcie_writel(pcie, reg, cfg);
117 static int cdns_set_msi(struct udevice *dev, uint fn, uint mmc)
119 struct cdns_pcie *pcie = dev_get_priv(dev);
120 u32 cap = CDNS_PCIE_EP_FUNC_MSI_CAP_OFFSET;
123 * Set the Multiple Message Capable bitfield into the Message Control
128 flags = cdns_pcie_ep_fn_readw(pcie, fn, cap + PCI_MSI_FLAGS);
129 flags = (flags & ~PCI_MSI_FLAGS_QMASK) | (mmc << 1);
130 flags |= PCI_MSI_FLAGS_64BIT;
131 flags &= ~PCI_MSI_FLAGS_MASKBIT;
132 cdns_pcie_ep_fn_writew(pcie, fn, cap + PCI_MSI_FLAGS, flags);
137 static struct pci_ep_ops cdns_pci_ep_ops = {
138 .write_header = cdns_write_header,
139 .set_bar = cdns_set_bar,
140 .set_msi = cdns_set_msi,
143 static int cdns_pci_ep_probe(struct udevice *dev)
145 struct cdns_pcie *pdata = dev_get_priv(dev);
147 pdata->reg_base = (void __iomem *)devfdt_get_addr(dev);
148 if (!pdata->reg_base)
151 pdata->max_functions = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
153 pdata->max_regions = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
154 "cdns,max-outbound-regions", 8);
159 static int cdns_pci_ep_remove(struct udevice *dev)
164 const struct udevice_id cadence_pci_ep_of_match[] = {
165 { .compatible = "cdns,cdns-pcie-ep" },
169 U_BOOT_DRIVER(cdns_pcie) = {
170 .name = "cdns,pcie-ep",
172 .of_match = cadence_pci_ep_of_match,
173 .ops = &cdns_pci_ep_ops,
174 .probe = cdns_pci_ep_probe,
175 .remove = cdns_pci_ep_remove,
176 .priv_auto_alloc_size = sizeof(struct cdns_pcie),