// SPDX-License-Identifier: GPL-2.0
/*
* Synopsys DesignWare PCIe host controller driver
*
* Copyright (C) 2013 Samsung Electronics Co., Ltd.
* https://www.samsung.com
*
* Author: Jingoo Han <[email protected]>
*/
#include <linux/iopoll.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/irqdomain.h>
#include <linux/msi.h>
#include <linux/of_address.h>
#include <linux/of_pci.h>
#include <linux/pci_regs.h>
#include <linux/platform_device.h>
#include "../../pci.h"
#include "pcie-designware.h"
static struct pci_ops dw_pcie_ops;
static struct pci_ops dw_child_pcie_ops;
static void dw_msi_ack_irq(struct irq_data *d)
{
irq_chip_ack_parent(d);
}
static void dw_msi_mask_irq(struct irq_data *d)
{
pci_msi_mask_irq(d);
irq_chip_mask_parent(d);
}
static void dw_msi_unmask_irq(struct irq_data *d)
{
pci_msi_unmask_irq(d);
irq_chip_unmask_parent(d);
}
static struct irq_chip dw_pcie_msi_irq_chip = {
.name = "PCI-MSI",
.irq_ack = dw_msi_ack_irq,
.irq_mask = dw_msi_mask_irq,
.irq_unmask = dw_msi_unmask_irq,
};
static struct msi_domain_info dw_pcie_msi_domain_info = {
.flags = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
MSI_FLAG_NO_AFFINITY | MSI_FLAG_PCI_MSIX |
MSI_FLAG_MULTI_PCI_MSI,
.chip = &dw_pcie_msi_irq_chip,
};
/* MSI int handler */
irqreturn_t dw_handle_msi_irq(struct dw_pcie_rp *pp)
{
int i, pos;
unsigned long val;
u32 status, num_ctrls;
irqreturn_t ret = IRQ_NONE;
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
for (i = 0; i < num_ctrls; i++) {
status = dw_pcie_readl_dbi(pci, PCIE_MSI_INTR0_STATUS +
(i * MSI_REG_CTRL_BLOCK_SIZE));
if (!status)
continue;
ret = IRQ_HANDLED;
val = status;
pos = 0;
while ((pos = find_next_bit(&val, MAX_MSI_IRQS_PER_CTRL,
pos)) != MAX_MSI_IRQS_PER_CTRL) {
generic_handle_domain_irq(pp->irq_domain,
(i * MAX_MSI_IRQS_PER_CTRL) +
pos);
pos++;
}
}
return ret;
}
/* Chained MSI interrupt service routine */
static void dw_chained_msi_isr(struct irq_desc *desc)
{
struct irq_chip *chip = irq_desc_get_chip(desc);
struct dw_pcie_rp *pp;
chained_irq_enter(chip, desc);
pp = irq_desc_get_handler_data(desc);
dw_handle_msi_irq(pp);
chained_irq_exit(chip, desc);
}
static void dw_pci_setup_msi_msg(struct irq_data *d, struct msi_msg *msg)
{
struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(d);
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
u64 msi_target;
msi_target = (u64)pp->msi_data;
msg->address_lo = lower_32_bits(msi_target);
msg->address_hi = upper_32_bits(msi_target);
msg->data = d->hwirq;
dev_dbg(pci->dev, "msi#%d address_hi %#x address_lo %#x\n",
(int)d->hwirq, msg->address_hi, msg->address_lo);
}
static void dw_pci_bottom_mask(struct irq_data *d)
{
struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(d);
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
unsigned int res, bit, ctrl;
unsigned long flags;
raw_spin_lock_irqsave(&pp->lock, flags);
ctrl = d->hwirq / MAX_MSI_IRQS_PER_CTRL;
res = ctrl * MSI_REG_CTRL_BLOCK_SIZE;
bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL;
pp->irq_mask[ctrl] |= BIT(bit);
dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_MASK + res, pp->irq_mask[ctrl]);
raw_spin_unlock_irqrestore(&pp->lock, flags);
}
static void dw_pci_bottom_unmask(struct irq_data *d)
{
struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(d);
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
unsigned int res, bit, ctrl;
unsigned long flags;
raw_spin_lock_irqsave(&pp->lock, flags);
ctrl = d->hwirq / MAX_MSI_IRQS_PER_CTRL;
res = ctrl * MSI_REG_CTRL_BLOCK_SIZE;
bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL;
pp->irq_mask[ctrl] &= ~BIT(bit);
dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_MASK + res, pp->irq_mask[ctrl]);
raw_spin_unlock_irqrestore(&pp->lock, flags);
}
static void dw_pci_bottom_ack(struct irq_data *d)
{
struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(d);
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
unsigned int res, bit, ctrl;
ctrl = d->hwirq / MAX_MSI_IRQS_PER_CTRL;
res = ctrl * MSI_REG_CTRL_BLOCK_SIZE;
bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL;
dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_STATUS + res, BIT(bit));
}
static struct irq_chip dw_pci_msi_bottom_irq_chip = {
.name = "DWPCI-MSI",
.irq_ack = dw_pci_bottom_ack,
.irq_compose_msi_msg = dw_pci_setup_msi_msg,
.irq_mask = dw_pci_bottom_mask,
.irq_unmask = dw_pci_bottom_unmask,
};
static int dw_pcie_irq_domain_alloc(struct irq_domain *domain,
unsigned int virq, unsigned int nr_irqs,
void *args)
{
struct dw_pcie_rp *pp = domain->host_data;
unsigned long flags;
u32 i;
int bit;
raw_spin_lock_irqsave(&pp->lock, flags);
bit = bitmap_find_free_region(pp->msi_irq_in_use, pp->num_vectors,
order_base_2(nr_irqs));
raw_spin_unlock_irqrestore(&pp->lock, flags);
if (bit < 0)
return -ENOSPC;
for (i = 0; i < nr_irqs; i++)
irq_domain_set_info(domain, virq + i, bit + i,
pp->msi_irq_chip,
pp, handle_edge_irq,
NULL, NULL);
return 0;
}
static void dw_pcie_irq_domain_free(struct irq_domain *domain,
unsigned int virq, unsigned int nr_irqs)
{
struct irq_data *d = irq_domain_get_irq_data(domain, virq);
struct dw_pcie_rp *pp = domain->host_data;
unsigned long flags;
raw_spin_lock_irqsave(&pp->lock, flags);
bitmap_release_region(pp->msi_irq_in_use, d->hwirq,
order_base_2(nr_irqs));
raw_spin_unlock_irqrestore(&pp->lock, flags);
}
static const struct irq_domain_ops dw_pcie_msi_domain_ops = {
.alloc = dw_pcie_irq_domain_alloc,
.free = dw_pcie_irq_domain_free,
};
int dw_pcie_allocate_domains(struct dw_pcie_rp *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct fwnode_handle *fwnode = of_node_to_fwnode(pci->dev->of_node);
pp->irq_domain = irq_domain_create_linear(fwnode, pp->num_vectors,
&dw_pcie_msi_domain_ops, pp);
if (!pp->irq_domain) {
dev_err(pci->dev, "Failed to create IRQ domain\n");
return -ENOMEM;
}
irq_domain_update_bus_token(pp->irq_domain, DOMAIN_BUS_NEXUS);
pp->msi_domain = pci_msi_create_irq_domain(fwnode,
&dw_pcie_msi_domain_info,
pp->irq_domain);
if (!pp->msi_domain) {
dev_err(pci->dev, "Failed to create MSI domain\n");
irq_domain_remove(pp->irq_domain);
return -ENOMEM;
}
return 0;
}
static void dw_pcie_free_msi(struct dw_pcie_rp *pp)
{
u32 ctrl;
for (ctrl = 0; ctrl < MAX_MSI_CTRLS; ctrl++) {
if (pp->msi_irq[ctrl] > 0)
irq_set_chained_handler_and_data(pp->msi_irq[ctrl],
NULL, NULL);
}
irq_domain_remove(pp->msi_domain);
irq_domain_remove(pp->irq_domain);
}
static void dw_pcie_msi_init(struct dw_pcie_rp *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
u64 msi_target = (u64)pp->msi_data;
if (!pci_msi_enabled() || !pp->has_msi_ctrl)
return;
/* Program the msi_data */
dw_pcie_writel_dbi(pci, PCIE_MSI_ADDR_LO, lower_32_bits(msi_target));
dw_pcie_writel_dbi(pci, PCIE_MSI_ADDR_HI, upper_32_bits(msi_target));
}
static int dw_pcie_parse_split_msi_irq(struct dw_pcie_rp *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct device *dev = pci->dev;
struct platform_device *pdev = to_platform_device(dev);
u32 ctrl, max_vectors;
int irq;
/* Parse any "msiX" IRQs described in the devicetree */
for (ctrl = 0; ctrl < MAX_MSI_CTRLS; ctrl++) {
char msi_name[] = "msiX";
msi_name[3] = '0' + ctrl;
irq = platform_get_irq_byname_optional(pdev, msi_name);
if (irq == -ENXIO)
break;
if (irq < 0)
return dev_err_probe(dev, irq,
"Failed to parse MSI IRQ '%s'\n",
msi_name);
pp->msi_irq[ctrl] = irq;
}
/* If no "msiX" IRQs, caller should fallback to "msi" IRQ */
if (ctrl == 0)
return -ENXIO;
max_vectors = ctrl * MAX_MSI_IRQS_PER_CTRL;
if (pp->num_vectors > max_vectors) {
dev_warn(dev, "Exceeding number of MSI vectors, limiting to %u\n",
max_vectors);
pp->num_vectors = max_vectors;
}
if (!pp->num_vectors)
pp->num_vectors = max_vectors;
return 0;
}
static int dw_pcie_msi_host_init(struct dw_pcie_rp *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct device *dev = pci->dev;
struct platform_device *pdev = to_platform_device(dev);
u64 *msi_vaddr = NULL;
int ret;
u32 ctrl, num_ctrls;
for (ctrl = 0; ctrl < MAX_MSI_CTRLS; ctrl++)
pp->irq_mask[ctrl] = ~0;
if (!pp->msi_irq[0]) {
ret = dw_pcie_parse_split_msi_irq(pp);
if (ret < 0 && ret != -ENXIO)
return ret;
}
if (!pp->num_vectors)
pp->num_vectors = MSI_DEF_NUM_VECTORS;
num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
if (!pp->msi_irq[0]) {
pp->msi_irq[0] = platform_get_irq_byname_optional(pdev, "msi");
if (pp->msi_irq[0] < 0) {
pp->msi_irq[0] = platform_get_irq(pdev, 0);
if (pp->msi_irq[0] < 0)
return pp->msi_irq[0];
}
}
dev_dbg(dev, "Using %d MSI vectors\n", pp->num_vectors);
pp->msi_irq_chip = &dw_pci_msi_bottom_irq_chip;
ret = dw_pcie_allocate_domains(pp);
if (ret)
return ret;
for (ctrl = 0; ctrl < num_ctrls; ctrl++) {
if (pp->msi_irq[ctrl] > 0)
irq_set_chained_handler_and_data(pp->msi_irq[ctrl],
dw_chained_msi_isr, pp);
}
/*
* Even though the iMSI-RX Module supports 64-bit addresses some
* peripheral PCIe devices may lack 64-bit message support. In
* order not to miss MSI TLPs from those devices the MSI target
* address has to be within the lowest 4GB.
*
* Note until there is a better alternative found the reservation is
* done by allocating from the artificially limited DMA-coherent
* memory.
*/
ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
if (!ret)
msi_vaddr = dmam_alloc_coherent(dev, sizeof(u64), &pp->msi_data,
GFP_KERNEL);
if (!msi_vaddr) {
dev_warn(dev, "Failed to allocate 32-bit MSI address\n");
dma_set_coherent_mask(dev, DMA_BIT_MASK(64));
msi_vaddr = dmam_alloc_coherent(dev, sizeof(u64), &pp->msi_data,
GFP_KERNEL);
if (!msi_vaddr) {
dev_err(dev, "Failed to allocate MSI address\n");
dw_pcie_free_msi(pp);
return -ENOMEM;
}
}
return 0;
}
static void dw_pcie_host_request_msg_tlp_res(struct dw_pcie_rp *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct resource_entry *win;
struct resource *res;
win = resource_list_first_type(&pp->bridge->windows, IORESOURCE_MEM);
if (win) {
res = devm_kzalloc(pci->dev, sizeof(*res), GFP_KERNEL);
if (!res)
return;
/*
* Allocate MSG TLP region of size 'region_align' at the end of
* the host bridge window.
*/
res->start = win->res->end - pci->region_align + 1;
res->end = win->res->end;
res->name = "msg";
res->flags = win->res->flags | IORESOURCE_BUSY;
if (!devm_request_resource(pci->dev, win->res, res))
pp->msg_res = res;
}
}
int dw_pcie_host_init(struct dw_pcie_rp *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct device *dev = pci->dev;
struct device_node *np = dev->of_node;
struct platform_device *pdev = to_platform_device(dev);
struct resource_entry *win;
struct pci_host_bridge *bridge;
struct resource *res;
int ret;
raw_spin_lock_init(&pp->lock);
ret = dw_pcie_get_resources(pci);
if (ret)
return ret;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config");
if (res) {
pp->cfg0_size = resource_size(res);
pp->cfg0_base = res->start;
pp->va_cfg0_base = devm_pci_remap_cfg_resource(dev, res);
if (IS_ERR(pp->va_cfg0_base))
return PTR_ERR(pp->va_cfg0_base);
} else {
dev_err(dev, "Missing *config* reg space\n");
return -ENODEV;
}
bridge = devm_pci_alloc_host_bridge(dev, 0);
if (!bridge)
return -ENOMEM;
pp->bridge = bridge;
/* Get the I/O range from DT */
win = resource_list_first_type(&bridge->windows, IORESOURCE_IO);
if (win) {
pp->io_size = resource_size(win->res);
pp->io_bus_addr = win->res->start - win->offset;
pp->io_base = pci_pio_to_address(win->res->start);
}
/* Set default bus ops */
bridge->ops = &dw_pcie_ops;
bridge->child_ops = &dw_child_pcie_ops;
if (pp->ops->init) {
ret = pp->ops->init(pp);
if (ret)
return ret;
}
if (pci_msi_enabled()) {
pp->has_msi_ctrl = !(pp->ops->msi_init ||
of_property_read_bool(np, "msi-parent") ||
of_property_read_bool(np, "msi-map"));
/*
* For the has_msi_ctrl case the default assignment is handled
* in the dw_pcie_msi_host_init().
*/
if (!pp->has_msi_ctrl && !pp->num_vectors) {
pp->num_vectors = MSI_DEF_NUM_VECTORS;
} else if (pp->num_vectors > MAX_MSI_IRQS) {
dev_err(dev, "Invalid number of vectors\n");
ret = -EINVAL;
goto err_deinit_host;
}
if (pp->ops->msi_init) {
ret = pp->ops->msi_init(pp);
if (ret < 0)
goto err_deinit_host;
} else if (pp->has_msi_ctrl) {
ret = dw_pcie_msi_host_init(pp);
if (ret < 0)
goto err_deinit_host;
}
}
dw_pcie_version_detect(pci);
dw_pcie_iatu_detect(pci);
/*
* Allocate the resource for MSG TLP before programming the iATU
* outbound window in dw_pcie_setup_rc(). Since the allocation depends
* on the value of 'region_align', this has to be done after
* dw_pcie_iatu_detect().
*
* Glue drivers need to set 'use_atu_msg' before dw_pcie_host_init() to
* make use of the generic MSG TLP implementation.
*/
if (pp->use_atu_msg)
dw_pcie_host_request_msg_tlp_res(pp);
ret = dw_pcie_edma_detect(pci);
if (ret)
goto err_free_msi;
ret = dw_pcie_setup_rc(pp);
if (ret)
goto err_remove_edma;
if (!dw_pcie_link_up(pci)) {
ret = dw_pcie_start_link(pci);
if (ret)
goto err_remove_edma;
}
/* Ignore errors, the link may come up later */
dw_pcie_wait_for_link(pci);
bridge->sysdata = pp;
ret = pci_host_probe(bridge);
if (ret)
goto err_stop_link;
if (pp->ops->post_init)
pp->ops->post_init(pp);
return 0;
err_stop_link:
dw_pcie_stop_link(pci);
err_remove_edma:
dw_pcie_edma_remove(pci);
err_free_msi:
if (pp->has_msi_ctrl)
dw_pcie_free_msi(pp);
err_deinit_host:
if (pp->ops->deinit)
pp->ops->deinit(pp);
return ret;
}
EXPORT_SYMBOL_GPL(dw_pcie_host_init);
void dw_pcie_host_deinit(struct dw_pcie_rp *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
pci_stop_root_bus(pp->bridge->bus);
pci_remove_root_bus(pp->bridge->bus);
dw_pcie_stop_link(pci);
dw_pcie_edma_remove(pci);
if (pp->has_msi_ctrl)
dw_pcie_free_msi(pp);
if (pp->ops->deinit)
pp->ops->deinit(pp);
}
EXPORT_SYMBOL_GPL(dw_pcie_host_deinit);
static void __iomem *dw_pcie_other_conf_map_bus(struct pci_bus *bus,
unsigned int devfn, int where)
{
struct dw_pcie_rp *pp = bus->sysdata;
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct dw_pcie_ob_atu_cfg atu = { 0 };
int type, ret;
u32 busdev;
/*
* Checking whether the link is up here is a last line of defense
* against platforms that forward errors on the system bus as
* SError upon PCI configuration transactions issued when the link
* is down. This check is racy by definition and does not stop
* the system from triggering an SError if the link goes down
* after this check is performed.
*/
if (!dw_pcie_link_up(pci))
return NULL;
busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) |
PCIE_ATU_FUNC(PCI_FUNC(devfn));
if (pci_is_root_bus(bus->parent))
type = PCIE_ATU_TYPE_CFG0;
else
type = PCIE_ATU_TYPE_CFG1;
atu.type = type;
atu.cpu_addr = pp->cfg0_base;
atu.pci_addr = busdev;
atu.size = pp->cfg0_size;
ret = dw_pcie_prog_outbound_atu(pci, &atu);
if (ret)
return NULL;
return pp->va_cfg0_base + where;
}
static int dw_pcie_rd_other_conf(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 *val)
{
struct dw_pcie_rp *pp = bus->sysdata;
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct dw_pcie_ob_atu_cfg atu = { 0 };
int ret;
ret = pci_generic_config_read(bus, devfn, where, size, val);
if (ret != PCIBIOS_SUCCESSFUL)
return ret;
if (pp->cfg0_io_shared) {
atu.type = PCIE_ATU_TYPE_IO;
atu.cpu_addr = pp->io_base;
atu.pci_addr = pp->io_bus_addr;
atu.size = pp->io_size;
ret = dw_pcie_prog_outbound_atu(pci, &atu);
if (ret)
return PCIBIOS_SET_FAILED;
}
return PCIBIOS_SUCCESSFUL;
}
static int dw_pcie_wr_other_conf(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 val)
{
struct dw_pcie_rp *pp = bus->sysdata;
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct dw_pcie_ob_atu_cfg atu = { 0 };
int ret;
ret = pci_generic_config_write(bus, devfn, where, size, val);
if (ret != PCIBIOS_SUCCESSFUL)
return ret;
if (pp->cfg0_io_shared) {
atu.type = PCIE_ATU_TYPE_IO;
atu.cpu_addr = pp->io_base;
atu.pci_addr = pp->io_bus_addr;
atu.size = pp->io_size;
ret = dw_pcie_prog_outbound_atu(pci, &atu);
if (ret)
return PCIBIOS_SET_FAILED;
}
return PCIBIOS_SUCCESSFUL;
}
static struct pci_ops dw_child_pcie_ops = {
.map_bus = dw_pcie_other_conf_map_bus,
.read = dw_pcie_rd_other_conf,
.write = dw_pcie_wr_other_conf,
};
void __iomem *dw_pcie_own_conf_map_bus(struct pci_bus *bus, unsigned int devfn, int where)
{
struct dw_pcie_rp *pp = bus->sysdata;
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
if (PCI_SLOT(devfn) > 0)
return NULL;
return pci->dbi_base + where;
}
EXPORT_SYMBOL_GPL(dw_pcie_own_conf_map_bus);
static struct pci_ops dw_pcie_ops = {
.map_bus = dw_pcie_own_conf_map_bus,
.read = pci_generic_config_read,
.write = pci_generic_config_write,
};
static int dw_pcie_iatu_setup(struct dw_pcie_rp *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct dw_pcie_ob_atu_cfg atu = { 0 };
struct resource_entry *entry;
int i, ret;
/* Note the very first outbound ATU is used for CFG IOs */
if (!pci->num_ob_windows) {
dev_err(pci->dev, "No outbound iATU found\n");
return -EINVAL;
}
/*
* Ensure all out/inbound windows are disabled before proceeding with
* the MEM/IO (dma-)ranges setups.
*/
for (i = 0; i < pci->num_ob_windows; i++)
dw_pcie_disable_atu(pci, PCIE_ATU_REGION_DIR_OB, i);
for (i = 0; i < pci->num_ib_windows; i++)
dw_pcie_disable_atu(pci, PCIE_ATU_REGION_DIR_IB, i);
i = 0;
resource_list_for_each_entry(entry, &pp->bridge->windows) {
if (resource_type(entry->res) != IORESOURCE_MEM)
continue;
if (pci->num_ob_windows <= ++i)
break;
atu.index = i;
atu.type = PCIE_ATU_TYPE_MEM;
atu.cpu_addr = entry->res->start;
atu.pci_addr = entry->res->start - entry->offset;
/* Adjust iATU size if MSG TLP region was allocated before */
if (pp->msg_res && pp->msg_res->parent == entry->res)
atu.size = resource_size(entry->res) -
resource_size(pp->msg_res);
else
atu.size = resource_size(entry->res);
ret = dw_pcie_prog_outbound_atu(pci, &atu);
if (ret) {
dev_err(pci->dev, "Failed to set MEM range %pr\n",
entry->res);
return ret;
}
}
if (pp->io_size) {
if (pci->num_ob_windows > ++i) {
atu.index = i;
atu.type = PCIE_ATU_TYPE_IO;
atu.cpu_addr = pp->io_base;
atu.pci_addr = pp->io_bus_addr;
atu.size = pp->io_size;
ret = dw_pcie_prog_outbound_atu(pci, &atu);
if (ret) {
dev_err(pci->dev, "Failed to set IO range %pr\n",
entry->res);
return ret;
}
} else {
pp->cfg0_io_shared = true;
}
}
if (pci->num_ob_windows <= i)
dev_warn(pci->dev, "Ranges exceed outbound iATU size (%d)\n",
pci->num_ob_windows);
pp->msg_atu_index = i;
i = 0;
resource_list_for_each_entry(entry, &pp->bridge->dma_ranges) {
if (resource_type(entry->res) != IORESOURCE_MEM)
continue;
if (pci->num_ib_windows <= i)
break;
ret = dw_pcie_prog_inbound_atu(pci, i++, PCIE_ATU_TYPE_MEM,
entry->res->start,
entry->res->start - entry->offset,
resource_size(entry->res));
if (ret) {
dev_err(pci->dev, "Failed to set DMA range %pr\n",
entry->res);
return ret;
}
}
if (pci->num_ib_windows <= i)
dev_warn(pci->dev, "Dma-ranges exceed inbound iATU size (%u)\n",
pci->num_ib_windows);
return 0;
}
int dw_pcie_setup_rc(struct dw_pcie_rp *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
u32 val, ctrl, num_ctrls;
int ret;
/*
* Enable DBI read-only registers for writing/updating configuration.
* Write permission gets disabled towards the end of this function.
*/
dw_pcie_dbi_ro_wr_en(pci);
dw_pcie_setup(pci);
if (pp->has_msi_ctrl) {
num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
/* Initialize IRQ Status array */
for (ctrl = 0; ctrl < num_ctrls; ctrl++) {
dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_MASK +
(ctrl * MSI_REG_CTRL_BLOCK_SIZE),
pp->irq_mask[ctrl]);
dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_ENABLE +
(ctrl * MSI_REG_CTRL_BLOCK_SIZE),
~0);
}
}
dw_pcie_msi_init(pp);
/* Setup RC BARs */
dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0x00000004);
dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_1, 0x00000000);
/* Setup interrupt pins */
val = dw_pcie_readl_dbi(pci, PCI_INTERRUPT_LINE);
val &= 0xffff00ff;
val |= 0x00000100;
dw_pcie_writel_dbi(pci, PCI_INTERRUPT_LINE, val);
/* Setup bus numbers */
val = dw_pcie_readl_dbi(pci, PCI_PRIMARY_BUS);
val &= 0xff000000;
val |= 0x00ff0100;
dw_pcie_writel_dbi(pci, PCI_PRIMARY_BUS, val);
/* Setup command register */
val = dw_pcie_readl_dbi(pci, PCI_COMMAND);
val &= 0xffff0000;
val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
PCI_COMMAND_MASTER | PCI_COMMAND_SERR;
dw_pcie_writel_dbi(pci, PCI_COMMAND, val);
/*
* If the platform provides its own child bus config accesses, it means
* the platform uses its own address translation component rather than
* ATU, so we should not program the ATU here.
*/
if (pp->bridge->child_ops == &dw_child_pcie_ops) {
ret = dw_pcie_iatu_setup(pp);
if (ret)
return ret;
}
dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0);
/* Program correct class for RC */
dw_pcie_writew_dbi(pci, PCI_CLASS_DEVICE, PCI_CLASS_BRIDGE_PCI);
val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
val |= PORT_LOGIC_SPEED_CHANGE;
dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val);
dw_pcie_dbi_ro_wr_dis(pci);
return 0;
}
EXPORT_SYMBOL_GPL(dw_pcie_setup_rc);
static int dw_pcie_pme_turn_off(struct dw_pcie *pci)
{
struct dw_pcie_ob_atu_cfg atu = { 0 };
void __iomem *mem;
int ret;
if (pci->num_ob_windows <= pci->pp.msg_atu_index)
return -ENOSPC;
if (!pci->pp.msg_res)
return -ENOSPC;
atu.code = PCIE_MSG_CODE_PME_TURN_OFF;
atu.routing = PCIE_MSG_TYPE_R_BC;
atu.type = PCIE_ATU_TYPE_MSG;
atu.size = resource_size(pci->pp.msg_res);
atu.index = pci->pp.msg_atu_index;
atu.cpu_addr = pci->pp.msg_res->start;
ret = dw_pcie_prog_outbound_atu(pci, &atu);
if (ret)
return ret;
mem = ioremap(atu.cpu_addr, pci->region_align);
if (!mem)
return -ENOMEM;
/* A dummy write is converted to a Msg TLP */
writel(0, mem);
iounmap(mem);
return 0;
}
int dw_pcie_suspend_noirq(struct dw_pcie *pci)
{
u8 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
u32 val;
int ret = 0;
/*
* If L1SS is supported, then do not put the link into L2 as some
* devices such as NVMe expect low resume latency.
*/
if (dw_pcie_readw_dbi(pci, offset + PCI_EXP_LNKCTL) & PCI_EXP_LNKCTL_ASPM_L1)
return 0;
if (dw_pcie_get_ltssm(pci) <= DW_PCIE_LTSSM_DETECT_ACT)
return 0;
if (pci->pp.ops->pme_turn_off)
pci->pp.ops->pme_turn_off(&pci->pp);
else
ret = dw_pcie_pme_turn_off(pci);
if (ret)
return ret;
ret = read_poll_timeout(dw_pcie_get_ltssm, val, val == DW_PCIE_LTSSM_L2_IDLE,
PCIE_PME_TO_L2_TIMEOUT_US/10,
PCIE_PME_TO_L2_TIMEOUT_US, false, pci);
if (ret) {
dev_err(pci->dev, "Timeout waiting for L2 entry! LTSSM: 0x%x\n", val);
return ret;
}
if (pci->pp.ops->deinit)
pci->pp.ops->deinit(&pci->pp);
pci->suspended = true;
return ret;
}
EXPORT_SYMBOL_GPL(dw_pcie_suspend_noirq);
int dw_pcie_resume_noirq(struct dw_pcie *pci)
{
int ret;
if (!pci->suspended)
return 0;
pci->suspended = false;
if (pci->pp.ops->init) {
ret = pci->pp.ops->init(&pci->pp);
if (ret) {
dev_err(pci->dev, "Host init failed: %d\n", ret);
return ret;
}
}
dw_pcie_setup_rc(&pci->pp);
ret = dw_pcie_start_link(pci);
if (ret)
return ret;
ret = dw_pcie_wait_for_link(pci);
if (ret)
return ret;
return ret;
}
EXPORT_SYMBOL_GPL(dw_pcie_resume_noirq);
Codebase Browser
linux