pcie-cadence-ep.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2019
* Written by Ramon Fried <ramon.fried@gmail.com>
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <pci_ep.h>
#include <linux/sizes.h>
#include <linux/log2.h>
#include "pcie-cadence.h"
DECLARE_GLOBAL_DATA_PTR;
static int cdns_write_header(struct udevice *dev, uint fn,
struct pci_ep_header *hdr)
{
struct cdns_pcie *pcie = dev_get_priv(dev);
cdns_pcie_ep_fn_writew(pcie, fn, PCI_DEVICE_ID, hdr->deviceid);
cdns_pcie_ep_fn_writeb(pcie, fn, PCI_REVISION_ID, hdr->revid);
cdns_pcie_ep_fn_writeb(pcie, fn, PCI_CLASS_PROG,
hdr->progif_code);
cdns_pcie_ep_fn_writew(pcie, fn, PCI_CLASS_DEVICE,
hdr->subclass_code |
hdr->baseclass_code << 8);
cdns_pcie_ep_fn_writeb(pcie, fn, PCI_CACHE_LINE_SIZE,
hdr->cache_line_size);
cdns_pcie_ep_fn_writew(pcie, fn, PCI_SUBSYSTEM_ID,
hdr->subsys_id);
cdns_pcie_ep_fn_writeb(pcie, fn, PCI_INTERRUPT_PIN,
hdr->interrupt_pin);
/*
* Vendor ID can only be modified from function 0, all other functions
* use the same vendor ID as function 0.
*/
if (fn == 0) {
/* Update the vendor IDs. */
u32 id = CDNS_PCIE_LM_ID_VENDOR(hdr->vendorid) |
CDNS_PCIE_LM_ID_SUBSYS(hdr->subsys_vendor_id);
cdns_pcie_writel(pcie, CDNS_PCIE_LM_ID, id);
}
return 0;
}
static int cdns_set_bar(struct udevice *dev, uint fn, struct pci_bar *ep_bar)
{
struct cdns_pcie *pcie = dev_get_priv(dev);
dma_addr_t bar_phys = ep_bar->phys_addr;
enum pci_barno bar = ep_bar->barno;
int flags = ep_bar->flags;
u32 addr0, addr1, reg, cfg, b, aperture, ctrl;
u64 sz;
/* BAR size is 2^(aperture + 7) */
sz = max_t(size_t, ep_bar->size, CDNS_PCIE_EP_MIN_APERTURE);
/*
* roundup_pow_of_two() returns an unsigned long, which is not suited
* for 64bit values.
*/
sz = 1ULL << fls64(sz - 1);
aperture = ilog2(sz) - 7; /* 128B -> 0, 256B -> 1, 512B -> 2, ... */
if ((flags & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) {
ctrl = CDNS_PCIE_LM_BAR_CFG_CTRL_IO_32BITS;
} else {
bool is_prefetch = !!(flags & PCI_BASE_ADDRESS_MEM_PREFETCH);
bool is_64bits = (sz > SZ_2G) |
!!(ep_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64);
if (is_64bits && (bar & 1))
return -EINVAL;
if (is_64bits && !(flags & PCI_BASE_ADDRESS_MEM_TYPE_64))
ep_bar->flags |= PCI_BASE_ADDRESS_MEM_TYPE_64;
if (is_64bits && is_prefetch)
ctrl = CDNS_PCIE_LM_BAR_CFG_CTRL_PREFETCH_MEM_64BITS;
else if (is_prefetch)
ctrl = CDNS_PCIE_LM_BAR_CFG_CTRL_PREFETCH_MEM_32BITS;
else if (is_64bits)
ctrl = CDNS_PCIE_LM_BAR_CFG_CTRL_MEM_64BITS;
else
ctrl = CDNS_PCIE_LM_BAR_CFG_CTRL_MEM_32BITS;
}
addr0 = lower_32_bits(bar_phys);
addr1 = upper_32_bits(bar_phys);
cdns_pcie_writel(pcie, CDNS_PCIE_AT_IB_EP_FUNC_BAR_ADDR0(fn, bar),
addr0);
cdns_pcie_writel(pcie, CDNS_PCIE_AT_IB_EP_FUNC_BAR_ADDR1(fn, bar),
addr1);
if (bar < BAR_4) {
reg = CDNS_PCIE_LM_EP_FUNC_BAR_CFG0(fn);
b = bar;
} else {
reg = CDNS_PCIE_LM_EP_FUNC_BAR_CFG1(fn);
b = bar - BAR_4;
}
cfg = cdns_pcie_readl(pcie, reg);
cfg &= ~(CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_APERTURE_MASK(b) |
CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_CTRL_MASK(b));
cfg |= (CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_APERTURE(b, aperture) |
CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_CTRL(b, ctrl));
cdns_pcie_writel(pcie, reg, cfg);
return 0;
}
static int cdns_set_msi(struct udevice *dev, uint fn, uint mmc)
{
struct cdns_pcie *pcie = dev_get_priv(dev);
u32 cap = CDNS_PCIE_EP_FUNC_MSI_CAP_OFFSET;
/*
* Set the Multiple Message Capable bitfield into the Message Control
* register.
*/
u16 flags;
flags = cdns_pcie_ep_fn_readw(pcie, fn, cap + PCI_MSI_FLAGS);
flags = (flags & ~PCI_MSI_FLAGS_QMASK) | (mmc << 1);
flags |= PCI_MSI_FLAGS_64BIT;
flags &= ~PCI_MSI_FLAGS_MASKBIT;
cdns_pcie_ep_fn_writew(pcie, fn, cap + PCI_MSI_FLAGS, flags);
return 0;
}
static struct pci_ep_ops cdns_pci_ep_ops = {
.write_header = cdns_write_header,
.set_bar = cdns_set_bar,
.set_msi = cdns_set_msi,
};
static int cdns_pci_ep_probe(struct udevice *dev)
{
struct cdns_pcie *pdata = dev_get_priv(dev);
pdata->reg_base = (void __iomem *)devfdt_get_addr(dev);
if (!pdata->reg_base)
return -ENOMEM;
pdata->max_functions = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
"max-functions", 1);
pdata->max_regions = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
"cdns,max-outbound-regions", 8);
return 0;
}
static int cdns_pci_ep_remove(struct udevice *dev)
{
return 0;
}
const struct udevice_id cadence_pci_ep_of_match[] = {
{ .compatible = "cdns,cdns-pcie-ep" },
{ }
};
U_BOOT_DRIVER(cdns_pcie) = {
.name = "cdns,pcie-ep",
.id = UCLASS_PCI_EP,
.of_match = cadence_pci_ep_of_match,
.ops = &cdns_pci_ep_ops,
.probe = cdns_pci_ep_probe,
.remove = cdns_pci_ep_remove,
.priv_auto_alloc_size = sizeof(struct cdns_pcie),
};