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// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2017 Cadence
// Cadence PCIe host controller driver.
// Author: Cyrille Pitchen <cyrille.pitchen@free-electrons.com>
#include <linux/kernel.h>
#include <linux/of_address.h>
#include <linux/of_pci.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include "pcie-cadence.h"
static void __iomem *cdns_pci_map_bus(struct pci_bus *bus, unsigned int devfn,
int where)
{
struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
struct cdns_pcie_rc *rc = pci_host_bridge_priv(bridge);
struct cdns_pcie *pcie = &rc->pcie;
unsigned int busn = bus->number;
u32 addr0, desc0;
if (pci_is_root_bus(bus)) {
/*
* Only the root port (devfn == 0) is connected to this bus.
* All other PCI devices are behind some bridge hence on another
* bus.
*/
if (devfn)
return NULL;
return pcie->reg_base + (where & 0xfff);
}
/* Check that the link is up */
if (!(cdns_pcie_readl(pcie, CDNS_PCIE_LM_BASE) & 0x1))
return NULL;
/* Clear AXI link-down status */
cdns_pcie_writel(pcie, CDNS_PCIE_AT_LINKDOWN, 0x0);
/* Update Output registers for AXI region 0. */
addr0 = CDNS_PCIE_AT_OB_REGION_PCI_ADDR0_NBITS(12) |
CDNS_PCIE_AT_OB_REGION_PCI_ADDR0_DEVFN(devfn) |
CDNS_PCIE_AT_OB_REGION_PCI_ADDR0_BUS(busn);
cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_PCI_ADDR0(0), addr0);
/* Configuration Type 0 or Type 1 access. */
desc0 = CDNS_PCIE_AT_OB_REGION_DESC0_HARDCODED_RID |
CDNS_PCIE_AT_OB_REGION_DESC0_DEVFN(0);
/*
* The bus number was already set once for all in desc1 by
* cdns_pcie_host_init_address_translation().
*/
if (busn == bridge->busnr + 1)
desc0 |= CDNS_PCIE_AT_OB_REGION_DESC0_TYPE_CONF_TYPE0;
else
desc0 |= CDNS_PCIE_AT_OB_REGION_DESC0_TYPE_CONF_TYPE1;
cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_DESC0(0), desc0);
return rc->cfg_base + (where & 0xfff);
}
static struct pci_ops cdns_pcie_host_ops = {
.map_bus = cdns_pci_map_bus,
.read = pci_generic_config_read,
.write = pci_generic_config_write,
};
static int cdns_pcie_host_init_root_port(struct cdns_pcie_rc *rc)
{
struct cdns_pcie *pcie = &rc->pcie;
u32 value, ctrl;
/*
* Set the root complex BAR configuration register:
* - disable both BAR0 and BAR1.
* - enable Prefetchable Memory Base and Limit registers in type 1
* config space (64 bits).
* - enable IO Base and Limit registers in type 1 config
* space (32 bits).
*/
ctrl = CDNS_PCIE_LM_BAR_CFG_CTRL_DISABLED;
value = CDNS_PCIE_LM_RC_BAR_CFG_BAR0_CTRL(ctrl) |
CDNS_PCIE_LM_RC_BAR_CFG_BAR1_CTRL(ctrl) |
CDNS_PCIE_LM_RC_BAR_CFG_PREFETCH_MEM_ENABLE |
CDNS_PCIE_LM_RC_BAR_CFG_PREFETCH_MEM_64BITS |
CDNS_PCIE_LM_RC_BAR_CFG_IO_ENABLE |
CDNS_PCIE_LM_RC_BAR_CFG_IO_32BITS;
cdns_pcie_writel(pcie, CDNS_PCIE_LM_RC_BAR_CFG, value);
/* Set root port configuration space */
if (rc->vendor_id != 0xffff)
cdns_pcie_rp_writew(pcie, PCI_VENDOR_ID, rc->vendor_id);
if (rc->device_id != 0xffff)
cdns_pcie_rp_writew(pcie, PCI_DEVICE_ID, rc->device_id);
cdns_pcie_rp_writeb(pcie, PCI_CLASS_REVISION, 0);
cdns_pcie_rp_writeb(pcie, PCI_CLASS_PROG, 0);
cdns_pcie_rp_writew(pcie, PCI_CLASS_DEVICE, PCI_CLASS_BRIDGE_PCI);
return 0;
}
static int cdns_pcie_host_init_address_translation(struct cdns_pcie_rc *rc)
{
struct cdns_pcie *pcie = &rc->pcie;
struct pci_host_bridge *bridge = pci_host_bridge_from_priv(rc);
struct resource *mem_res = pcie->mem_res;
struct resource *cfg_res = rc->cfg_res;
struct resource_entry *entry;
u32 addr0, addr1, desc1;
u64 cpu_addr;
int r, busnr = 0;
entry = resource_list_first_type(&bridge->windows, IORESOURCE_BUS);
if (entry)
busnr = entry->res->start;
/*
* Reserve region 0 for PCI configure space accesses:
* OB_REGION_PCI_ADDR0 and OB_REGION_DESC0 are updated dynamically by
* cdns_pci_map_bus(), other region registers are set here once for all.
*/
addr1 = 0; /* Should be programmed to zero. */
desc1 = CDNS_PCIE_AT_OB_REGION_DESC1_BUS(busnr);
cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_PCI_ADDR1(0), addr1);
cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_DESC1(0), desc1);
cpu_addr = cfg_res->start - mem_res->start;
addr0 = CDNS_PCIE_AT_OB_REGION_CPU_ADDR0_NBITS(12) |
(lower_32_bits(cpu_addr) & GENMASK(31, 8));
addr1 = upper_32_bits(cpu_addr);
cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_CPU_ADDR0(0), addr0);
cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_CPU_ADDR1(0), addr1);
r = 1;
resource_list_for_each_entry(entry, &bridge->windows) {
struct resource *res = entry->res;
u64 pci_addr = res->start - entry->offset;
if (resource_type(res) == IORESOURCE_IO)
cdns_pcie_set_outbound_region(pcie, busnr, 0, r,
true,
pci_pio_to_address(res->start),
pci_addr,
resource_size(res));
else
cdns_pcie_set_outbound_region(pcie, busnr, 0, r,
false,
res->start,
pci_addr,
resource_size(res));
r++;
}
/*
* Set Root Port no BAR match Inbound Translation registers:
* needed for MSI and DMA.
* Root Port BAR0 and BAR1 are disabled, hence no need to set their
* inbound translation registers.
*/
addr0 = CDNS_PCIE_AT_IB_RP_BAR_ADDR0_NBITS(rc->no_bar_nbits);
addr1 = 0;
cdns_pcie_writel(pcie, CDNS_PCIE_AT_IB_RP_BAR_ADDR0(RP_NO_BAR), addr0);
cdns_pcie_writel(pcie, CDNS_PCIE_AT_IB_RP_BAR_ADDR1(RP_NO_BAR), addr1);
return 0;
}
static int cdns_pcie_host_init(struct device *dev,
struct cdns_pcie_rc *rc)
{
int err;
err = cdns_pcie_host_init_root_port(rc);
if (err)
return err;
return cdns_pcie_host_init_address_translation(rc);
}
int cdns_pcie_host_setup(struct cdns_pcie_rc *rc)
{
struct device *dev = rc->pcie.dev;
struct platform_device *pdev = to_platform_device(dev);
struct device_node *np = dev->of_node;
struct pci_host_bridge *bridge;
struct cdns_pcie *pcie;
struct resource *res;
int ret;
bridge = pci_host_bridge_from_priv(rc);
if (!bridge)
return -ENOMEM;
pcie = &rc->pcie;
pcie->is_rc = true;
rc->no_bar_nbits = 32;
of_property_read_u32(np, "cdns,no-bar-match-nbits", &rc->no_bar_nbits);
rc->vendor_id = 0xffff;
of_property_read_u32(np, "vendor-id", &rc->vendor_id);
rc->device_id = 0xffff;
of_property_read_u32(np, "device-id", &rc->device_id);
pcie->reg_base = devm_platform_ioremap_resource_byname(pdev, "reg");
if (IS_ERR(pcie->reg_base)) {
dev_err(dev, "missing \"reg\"\n");
return PTR_ERR(pcie->reg_base);
}
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
rc->cfg_base = devm_pci_remap_cfg_resource(dev, res);
if (IS_ERR(rc->cfg_base))
return PTR_ERR(rc->cfg_base);
rc->cfg_res = res;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mem");
if (!res) {
dev_err(dev, "missing \"mem\"\n");
return -EINVAL;
}
pcie->mem_res = res;
ret = cdns_pcie_host_init(dev, rc);
if (ret)
goto err_init;
bridge->ops = &cdns_pcie_host_ops;
ret = pci_host_probe(bridge);
if (ret < 0)
goto err_init;
return 0;
err_init:
pm_runtime_put_sync(dev);
return ret;
}
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