// SPDX-License-Identifier: GPL-2.0+
/*
* PCIe host controller driver for NWL PCIe Bridge
* Based on pcie-xilinx.c, pci-tegra.c
*
* (C) Copyright 2014 - 2015, Xilinx, Inc.
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/msi.h>
#include <linux/of_address.h>
#include <linux/of_pci.h>
#include <linux/of_platform.h>
#include <linux/pci.h>
#include <linux/pci-ecam.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/irqchip/chained_irq.h>
#include "../pci.h"
/* Bridge core config registers */
#define BRCFG_PCIE_RX0 0x00000000
#define BRCFG_PCIE_RX1 0x00000004
#define BRCFG_INTERRUPT 0x00000010
#define BRCFG_PCIE_RX_MSG_FILTER 0x00000020
/* Egress - Bridge translation registers */
#define E_BREG_CAPABILITIES 0x00000200
#define E_BREG_CONTROL 0x00000208
#define E_BREG_BASE_LO 0x00000210
#define E_BREG_BASE_HI 0x00000214
#define E_ECAM_CAPABILITIES 0x00000220
#define E_ECAM_CONTROL 0x00000228
#define E_ECAM_BASE_LO 0x00000230
#define E_ECAM_BASE_HI 0x00000234
/* Ingress - address translations */
#define I_MSII_CAPABILITIES 0x00000300
#define I_MSII_CONTROL 0x00000308
#define I_MSII_BASE_LO 0x00000310
#define I_MSII_BASE_HI 0x00000314
#define I_ISUB_CONTROL 0x000003E8
#define SET_ISUB_CONTROL BIT(0)
/* Rxed msg fifo - Interrupt status registers */
#define MSGF_MISC_STATUS 0x00000400
#define MSGF_MISC_MASK 0x00000404
#define MSGF_LEG_STATUS 0x00000420
#define MSGF_LEG_MASK 0x00000424
#define MSGF_MSI_STATUS_LO 0x00000440
#define MSGF_MSI_STATUS_HI 0x00000444
#define MSGF_MSI_MASK_LO 0x00000448
#define MSGF_MSI_MASK_HI 0x0000044C
/* Msg filter mask bits */
#define CFG_ENABLE_PM_MSG_FWD BIT(1)
#define CFG_ENABLE_INT_MSG_FWD BIT(2)
#define CFG_ENABLE_ERR_MSG_FWD BIT(3)
#define CFG_ENABLE_MSG_FILTER_MASK (CFG_ENABLE_PM_MSG_FWD | \
CFG_ENABLE_INT_MSG_FWD | \
CFG_ENABLE_ERR_MSG_FWD)
/* Misc interrupt status mask bits */
#define MSGF_MISC_SR_RXMSG_AVAIL BIT(0)
#define MSGF_MISC_SR_RXMSG_OVER BIT(1)
#define MSGF_MISC_SR_SLAVE_ERR BIT(4)
#define MSGF_MISC_SR_MASTER_ERR BIT(5)
#define MSGF_MISC_SR_I_ADDR_ERR BIT(6)
#define MSGF_MISC_SR_E_ADDR_ERR BIT(7)
#define MSGF_MISC_SR_FATAL_AER BIT(16)
#define MSGF_MISC_SR_NON_FATAL_AER BIT(17)
#define MSGF_MISC_SR_CORR_AER BIT(18)
#define MSGF_MISC_SR_UR_DETECT BIT(20)
#define MSGF_MISC_SR_NON_FATAL_DEV BIT(22)
#define MSGF_MISC_SR_FATAL_DEV BIT(23)
#define MSGF_MISC_SR_LINK_DOWN BIT(24)
#define MSGF_MISC_SR_LINK_AUTO_BWIDTH BIT(25)
#define MSGF_MISC_SR_LINK_BWIDTH BIT(26)
#define MSGF_MISC_SR_MASKALL (MSGF_MISC_SR_RXMSG_AVAIL | \
MSGF_MISC_SR_RXMSG_OVER | \
MSGF_MISC_SR_SLAVE_ERR | \
MSGF_MISC_SR_MASTER_ERR | \
MSGF_MISC_SR_I_ADDR_ERR | \
MSGF_MISC_SR_E_ADDR_ERR | \
MSGF_MISC_SR_FATAL_AER | \
MSGF_MISC_SR_NON_FATAL_AER | \
MSGF_MISC_SR_CORR_AER | \
MSGF_MISC_SR_UR_DETECT | \
MSGF_MISC_SR_NON_FATAL_DEV | \
MSGF_MISC_SR_FATAL_DEV | \
MSGF_MISC_SR_LINK_DOWN | \
MSGF_MISC_SR_LINK_AUTO_BWIDTH | \
MSGF_MISC_SR_LINK_BWIDTH)
/* Legacy interrupt status mask bits */
#define MSGF_LEG_SR_INTA BIT(0)
#define MSGF_LEG_SR_INTB BIT(1)
#define MSGF_LEG_SR_INTC BIT(2)
#define MSGF_LEG_SR_INTD BIT(3)
#define MSGF_LEG_SR_MASKALL (MSGF_LEG_SR_INTA | MSGF_LEG_SR_INTB | \
MSGF_LEG_SR_INTC | MSGF_LEG_SR_INTD)
/* MSI interrupt status mask bits */
#define MSGF_MSI_SR_LO_MASK GENMASK(31, 0)
#define MSGF_MSI_SR_HI_MASK GENMASK(31, 0)
#define MSII_PRESENT BIT(0)
#define MSII_ENABLE BIT(0)
#define MSII_STATUS_ENABLE BIT(15)
/* Bridge config interrupt mask */
#define BRCFG_INTERRUPT_MASK BIT(0)
#define BREG_PRESENT BIT(0)
#define BREG_ENABLE BIT(0)
#define BREG_ENABLE_FORCE BIT(1)
/* E_ECAM status mask bits */
#define E_ECAM_PRESENT BIT(0)
#define E_ECAM_CR_ENABLE BIT(0)
#define E_ECAM_SIZE_LOC GENMASK(20, 16)
#define E_ECAM_SIZE_SHIFT 16
#define NWL_ECAM_MAX_SIZE 16
#define CFG_DMA_REG_BAR GENMASK(2, 0)
#define CFG_PCIE_CACHE GENMASK(7, 0)
#define INT_PCI_MSI_NR (2 * 32)
/* Readin the PS_LINKUP */
#define PS_LINKUP_OFFSET 0x00000238
#define PCIE_PHY_LINKUP_BIT BIT(0)
#define PHY_RDY_LINKUP_BIT BIT(1)
/* Parameters for the waiting for link up routine */
#define LINK_WAIT_MAX_RETRIES 10
#define LINK_WAIT_USLEEP_MIN 90000
#define LINK_WAIT_USLEEP_MAX 100000
struct nwl_msi { /* MSI information */
struct irq_domain *msi_domain;
DECLARE_BITMAP(bitmap, INT_PCI_MSI_NR);
struct irq_domain *dev_domain;
struct mutex lock; /* protect bitmap variable */
int irq_msi0;
int irq_msi1;
};
struct nwl_pcie {
struct device *dev;
void __iomem *breg_base;
void __iomem *pcireg_base;
void __iomem *ecam_base;
struct phy *phy[4];
phys_addr_t phys_breg_base; /* Physical Bridge Register Base */
phys_addr_t phys_pcie_reg_base; /* Physical PCIe Controller Base */
phys_addr_t phys_ecam_base; /* Physical Configuration Base */
u32 breg_size;
u32 pcie_reg_size;
u32 ecam_size;
int irq_intx;
int irq_misc;
struct nwl_msi msi;
struct irq_domain *intx_irq_domain;
struct clk *clk;
raw_spinlock_t leg_mask_lock;
};
static inline u32 nwl_bridge_readl(struct nwl_pcie *pcie, u32 off)
{
return readl(pcie->breg_base + off);
}
static inline void nwl_bridge_writel(struct nwl_pcie *pcie, u32 val, u32 off)
{
writel(val, pcie->breg_base + off);
}
static bool nwl_pcie_link_up(struct nwl_pcie *pcie)
{
if (readl(pcie->pcireg_base + PS_LINKUP_OFFSET) & PCIE_PHY_LINKUP_BIT)
return true;
return false;
}
static bool nwl_phy_link_up(struct nwl_pcie *pcie)
{
if (readl(pcie->pcireg_base + PS_LINKUP_OFFSET) & PHY_RDY_LINKUP_BIT)
return true;
return false;
}
static int nwl_wait_for_link(struct nwl_pcie *pcie)
{
struct device *dev = pcie->dev;
int retries;
/* check if the link is up or not */
for (retries = 0; retries < LINK_WAIT_MAX_RETRIES; retries++) {
if (nwl_phy_link_up(pcie))
return 0;
usleep_range(LINK_WAIT_USLEEP_MIN, LINK_WAIT_USLEEP_MAX);
}
dev_err(dev, "PHY link never came up\n");
return -ETIMEDOUT;
}
static bool nwl_pcie_valid_device(struct pci_bus *bus, unsigned int devfn)
{
struct nwl_pcie *pcie = bus->sysdata;
/* Check link before accessing downstream ports */
if (!pci_is_root_bus(bus)) {
if (!nwl_pcie_link_up(pcie))
return false;
} else if (devfn > 0)
/* Only one device down on each root port */
return false;
return true;
}
/**
* nwl_pcie_map_bus - Get configuration base
*
* @bus: Bus structure of current bus
* @devfn: Device/function
* @where: Offset from base
*
* Return: Base address of the configuration space needed to be
* accessed.
*/
static void __iomem *nwl_pcie_map_bus(struct pci_bus *bus, unsigned int devfn,
int where)
{
struct nwl_pcie *pcie = bus->sysdata;
if (!nwl_pcie_valid_device(bus, devfn))
return NULL;
return pcie->ecam_base + PCIE_ECAM_OFFSET(bus->number, devfn, where);
}
/* PCIe operations */
static struct pci_ops nwl_pcie_ops = {
.map_bus = nwl_pcie_map_bus,
.read = pci_generic_config_read,
.write = pci_generic_config_write,
};
static irqreturn_t nwl_pcie_misc_handler(int irq, void *data)
{
struct nwl_pcie *pcie = data;
struct device *dev = pcie->dev;
u32 misc_stat;
/* Checking for misc interrupts */
misc_stat = nwl_bridge_readl(pcie, MSGF_MISC_STATUS) &
MSGF_MISC_SR_MASKALL;
if (!misc_stat)
return IRQ_NONE;
if (misc_stat & MSGF_MISC_SR_RXMSG_OVER)
dev_err_ratelimited(dev, "Received Message FIFO Overflow\n");
if (misc_stat & MSGF_MISC_SR_SLAVE_ERR)
dev_err_ratelimited(dev, "Slave error\n");
if (misc_stat & MSGF_MISC_SR_MASTER_ERR)
dev_err_ratelimited(dev, "Master error\n");
if (misc_stat & MSGF_MISC_SR_I_ADDR_ERR)
dev_err_ratelimited(dev, "In Misc Ingress address translation error\n");
if (misc_stat & MSGF_MISC_SR_E_ADDR_ERR)
dev_err_ratelimited(dev, "In Misc Egress address translation error\n");
if (misc_stat & MSGF_MISC_SR_FATAL_AER)
dev_err_ratelimited(dev, "Fatal Error in AER Capability\n");
if (misc_stat & MSGF_MISC_SR_NON_FATAL_AER)
dev_err_ratelimited(dev, "Non-Fatal Error in AER Capability\n");
if (misc_stat & MSGF_MISC_SR_CORR_AER)
dev_err_ratelimited(dev, "Correctable Error in AER Capability\n");
if (misc_stat & MSGF_MISC_SR_UR_DETECT)
dev_err_ratelimited(dev, "Unsupported request Detected\n");
if (misc_stat & MSGF_MISC_SR_NON_FATAL_DEV)
dev_err_ratelimited(dev, "Non-Fatal Error Detected\n");
if (misc_stat & MSGF_MISC_SR_FATAL_DEV)
dev_err_ratelimited(dev, "Fatal Error Detected\n");
if (misc_stat & MSGF_MISC_SR_LINK_AUTO_BWIDTH)
dev_info(dev, "Link Autonomous Bandwidth Management Status bit set\n");
if (misc_stat & MSGF_MISC_SR_LINK_BWIDTH)
dev_info(dev, "Link Bandwidth Management Status bit set\n");
/* Clear misc interrupt status */
nwl_bridge_writel(pcie, misc_stat, MSGF_MISC_STATUS);
return IRQ_HANDLED;
}
static void nwl_pcie_leg_handler(struct irq_desc *desc)
{
struct irq_chip *chip = irq_desc_get_chip(desc);
struct nwl_pcie *pcie;
unsigned long status;
u32 bit;
chained_irq_enter(chip, desc);
pcie = irq_desc_get_handler_data(desc);
while ((status = nwl_bridge_readl(pcie, MSGF_LEG_STATUS) &
MSGF_LEG_SR_MASKALL) != 0) {
for_each_set_bit(bit, &status, PCI_NUM_INTX)
generic_handle_domain_irq(pcie->intx_irq_domain, bit);
}
chained_irq_exit(chip, desc);
}
static void nwl_pcie_handle_msi_irq(struct nwl_pcie *pcie, u32 status_reg)
{
struct nwl_msi *msi = &pcie->msi;
unsigned long status;
u32 bit;
while ((status = nwl_bridge_readl(pcie, status_reg)) != 0) {
for_each_set_bit(bit, &status, 32) {
nwl_bridge_writel(pcie, 1 << bit, status_reg);
generic_handle_domain_irq(msi->dev_domain, bit);
}
}
}
static void nwl_pcie_msi_handler_high(struct irq_desc *desc)
{
struct irq_chip *chip = irq_desc_get_chip(desc);
struct nwl_pcie *pcie = irq_desc_get_handler_data(desc);
chained_irq_enter(chip, desc);
nwl_pcie_handle_msi_irq(pcie, MSGF_MSI_STATUS_HI);
chained_irq_exit(chip, desc);
}
static void nwl_pcie_msi_handler_low(struct irq_desc *desc)
{
struct irq_chip *chip = irq_desc_get_chip(desc);
struct nwl_pcie *pcie = irq_desc_get_handler_data(desc);
chained_irq_enter(chip, desc);
nwl_pcie_handle_msi_irq(pcie, MSGF_MSI_STATUS_LO);
chained_irq_exit(chip, desc);
}
static void nwl_mask_intx_irq(struct irq_data *data)
{
struct nwl_pcie *pcie = irq_data_get_irq_chip_data(data);
unsigned long flags;
u32 mask;
u32 val;
mask = 1 << data->hwirq;
raw_spin_lock_irqsave(&pcie->leg_mask_lock, flags);
val = nwl_bridge_readl(pcie, MSGF_LEG_MASK);
nwl_bridge_writel(pcie, (val & (~mask)), MSGF_LEG_MASK);
raw_spin_unlock_irqrestore(&pcie->leg_mask_lock, flags);
}
static void nwl_unmask_intx_irq(struct irq_data *data)
{
struct nwl_pcie *pcie = irq_data_get_irq_chip_data(data);
unsigned long flags;
u32 mask;
u32 val;
mask = 1 << data->hwirq;
raw_spin_lock_irqsave(&pcie->leg_mask_lock, flags);
val = nwl_bridge_readl(pcie, MSGF_LEG_MASK);
nwl_bridge_writel(pcie, (val | mask), MSGF_LEG_MASK);
raw_spin_unlock_irqrestore(&pcie->leg_mask_lock, flags);
}
static struct irq_chip nwl_intx_irq_chip = {
.name = "nwl_pcie:legacy",
.irq_enable = nwl_unmask_intx_irq,
.irq_disable = nwl_mask_intx_irq,
.irq_mask = nwl_mask_intx_irq,
.irq_unmask = nwl_unmask_intx_irq,
};
static int nwl_intx_map(struct irq_domain *domain, unsigned int irq,
irq_hw_number_t hwirq)
{
irq_set_chip_and_handler(irq, &nwl_intx_irq_chip, handle_level_irq);
irq_set_chip_data(irq, domain->host_data);
irq_set_status_flags(irq, IRQ_LEVEL);
return 0;
}
static const struct irq_domain_ops intx_domain_ops = {
.map = nwl_intx_map,
.xlate = pci_irqd_intx_xlate,
};
#ifdef CONFIG_PCI_MSI
static struct irq_chip nwl_msi_irq_chip = {
.name = "nwl_pcie:msi",
.irq_enable = pci_msi_unmask_irq,
.irq_disable = pci_msi_mask_irq,
.irq_mask = pci_msi_mask_irq,
.irq_unmask = pci_msi_unmask_irq,
};
static struct msi_domain_info nwl_msi_domain_info = {
.flags = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
MSI_FLAG_NO_AFFINITY | MSI_FLAG_MULTI_PCI_MSI,
.chip = &nwl_msi_irq_chip,
};
#endif
static void nwl_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
{
struct nwl_pcie *pcie = irq_data_get_irq_chip_data(data);
phys_addr_t msi_addr = pcie->phys_pcie_reg_base;
msg->address_lo = lower_32_bits(msi_addr);
msg->address_hi = upper_32_bits(msi_addr);
msg->data = data->hwirq;
}
static struct irq_chip nwl_irq_chip = {
.name = "Xilinx MSI",
.irq_compose_msi_msg = nwl_compose_msi_msg,
};
static int nwl_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
unsigned int nr_irqs, void *args)
{
struct nwl_pcie *pcie = domain->host_data;
struct nwl_msi *msi = &pcie->msi;
int bit;
int i;
mutex_lock(&msi->lock);
bit = bitmap_find_free_region(msi->bitmap, INT_PCI_MSI_NR,
get_count_order(nr_irqs));
if (bit < 0) {
mutex_unlock(&msi->lock);
return -ENOSPC;
}
for (i = 0; i < nr_irqs; i++) {
irq_domain_set_info(domain, virq + i, bit + i, &nwl_irq_chip,
domain->host_data, handle_simple_irq,
NULL, NULL);
}
mutex_unlock(&msi->lock);
return 0;
}
static void nwl_irq_domain_free(struct irq_domain *domain, unsigned int virq,
unsigned int nr_irqs)
{
struct irq_data *data = irq_domain_get_irq_data(domain, virq);
struct nwl_pcie *pcie = irq_data_get_irq_chip_data(data);
struct nwl_msi *msi = &pcie->msi;
mutex_lock(&msi->lock);
bitmap_release_region(msi->bitmap, data->hwirq,
get_count_order(nr_irqs));
mutex_unlock(&msi->lock);
}
static const struct irq_domain_ops dev_msi_domain_ops = {
.alloc = nwl_irq_domain_alloc,
.free = nwl_irq_domain_free,
};
static int nwl_pcie_init_msi_irq_domain(struct nwl_pcie *pcie)
{
#ifdef CONFIG_PCI_MSI
struct device *dev = pcie->dev;
struct fwnode_handle *fwnode = of_node_to_fwnode(dev->of_node);
struct nwl_msi *msi = &pcie->msi;
msi->dev_domain = irq_domain_add_linear(NULL, INT_PCI_MSI_NR,
&dev_msi_domain_ops, pcie);
if (!msi->dev_domain) {
dev_err(dev, "failed to create dev IRQ domain\n");
return -ENOMEM;
}
msi->msi_domain = pci_msi_create_irq_domain(fwnode,
&nwl_msi_domain_info,
msi->dev_domain);
if (!msi->msi_domain) {
dev_err(dev, "failed to create msi IRQ domain\n");
irq_domain_remove(msi->dev_domain);
return -ENOMEM;
}
#endif
return 0;
}
static void nwl_pcie_phy_power_off(struct nwl_pcie *pcie, int i)
{
int err = phy_power_off(pcie->phy[i]);
if (err)
dev_err(pcie->dev, "could not power off phy %d (err=%d)\n", i,
err);
}
static void nwl_pcie_phy_exit(struct nwl_pcie *pcie, int i)
{
int err = phy_exit(pcie->phy[i]);
if (err)
dev_err(pcie->dev, "could not exit phy %d (err=%d)\n", i, err);
}
static int nwl_pcie_phy_enable(struct nwl_pcie *pcie)
{
int i, ret;
for (i = 0; i < ARRAY_SIZE(pcie->phy); i++) {
ret = phy_init(pcie->phy[i]);
if (ret)
goto err;
ret = phy_power_on(pcie->phy[i]);
if (ret) {
nwl_pcie_phy_exit(pcie, i);
goto err;
}
}
return 0;
err:
while (i--) {
nwl_pcie_phy_power_off(pcie, i);
nwl_pcie_phy_exit(pcie, i);
}
return ret;
}
static void nwl_pcie_phy_disable(struct nwl_pcie *pcie)
{
int i;
for (i = ARRAY_SIZE(pcie->phy); i--;) {
nwl_pcie_phy_power_off(pcie, i);
nwl_pcie_phy_exit(pcie, i);
}
}
static int nwl_pcie_init_irq_domain(struct nwl_pcie *pcie)
{
struct device *dev = pcie->dev;
struct device_node *node = dev->of_node;
struct device_node *intc_node;
intc_node = of_get_next_child(node, NULL);
if (!intc_node) {
dev_err(dev, "No legacy intc node found\n");
return -EINVAL;
}
pcie->intx_irq_domain = irq_domain_add_linear(intc_node,
PCI_NUM_INTX,
&intx_domain_ops,
pcie);
of_node_put(intc_node);
if (!pcie->intx_irq_domain) {
dev_err(dev, "failed to create IRQ domain\n");
return -ENOMEM;
}
raw_spin_lock_init(&pcie->leg_mask_lock);
nwl_pcie_init_msi_irq_domain(pcie);
return 0;
}
static int nwl_pcie_enable_msi(struct nwl_pcie *pcie)
{
struct device *dev = pcie->dev;
struct platform_device *pdev = to_platform_device(dev);
struct nwl_msi *msi = &pcie->msi;
unsigned long base;
int ret;
mutex_init(&msi->lock);
/* Get msi_1 IRQ number */
msi->irq_msi1 = platform_get_irq_byname(pdev, "msi1");
if (msi->irq_msi1 < 0)
return -EINVAL;
irq_set_chained_handler_and_data(msi->irq_msi1,
nwl_pcie_msi_handler_high, pcie);
/* Get msi_0 IRQ number */
msi->irq_msi0 = platform_get_irq_byname(pdev, "msi0");
if (msi->irq_msi0 < 0)
return -EINVAL;
irq_set_chained_handler_and_data(msi->irq_msi0,
nwl_pcie_msi_handler_low, pcie);
/* Check for msii_present bit */
ret = nwl_bridge_readl(pcie, I_MSII_CAPABILITIES) & MSII_PRESENT;
if (!ret) {
dev_err(dev, "MSI not present\n");
return -EIO;
}
/* Enable MSII */
nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, I_MSII_CONTROL) |
MSII_ENABLE, I_MSII_CONTROL);
/* Enable MSII status */
nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, I_MSII_CONTROL) |
MSII_STATUS_ENABLE, I_MSII_CONTROL);
/* setup AFI/FPCI range */
base = pcie->phys_pcie_reg_base;
nwl_bridge_writel(pcie, lower_32_bits(base), I_MSII_BASE_LO);
nwl_bridge_writel(pcie, upper_32_bits(base), I_MSII_BASE_HI);
/*
* For high range MSI interrupts: disable, clear any pending,
* and enable
*/
nwl_bridge_writel(pcie, 0, MSGF_MSI_MASK_HI);
nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_MSI_STATUS_HI) &
MSGF_MSI_SR_HI_MASK, MSGF_MSI_STATUS_HI);
nwl_bridge_writel(pcie, MSGF_MSI_SR_HI_MASK, MSGF_MSI_MASK_HI);
/*
* For low range MSI interrupts: disable, clear any pending,
* and enable
*/
nwl_bridge_writel(pcie, 0, MSGF_MSI_MASK_LO);
nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_MSI_STATUS_LO) &
MSGF_MSI_SR_LO_MASK, MSGF_MSI_STATUS_LO);
nwl_bridge_writel(pcie, MSGF_MSI_SR_LO_MASK, MSGF_MSI_MASK_LO);
return 0;
}
static int nwl_pcie_bridge_init(struct nwl_pcie *pcie)
{
struct device *dev = pcie->dev;
struct platform_device *pdev = to_platform_device(dev);
u32 breg_val, ecam_val;
int err;
breg_val = nwl_bridge_readl(pcie, E_BREG_CAPABILITIES) & BREG_PRESENT;
if (!breg_val) {
dev_err(dev, "BREG is not present\n");
return breg_val;
}
/* Write bridge_off to breg base */
nwl_bridge_writel(pcie, lower_32_bits(pcie->phys_breg_base),
E_BREG_BASE_LO);
nwl_bridge_writel(pcie, upper_32_bits(pcie->phys_breg_base),
E_BREG_BASE_HI);
/* Enable BREG */
nwl_bridge_writel(pcie, ~BREG_ENABLE_FORCE & BREG_ENABLE,
E_BREG_CONTROL);
/* Disable DMA channel registers */
nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, BRCFG_PCIE_RX0) |
CFG_DMA_REG_BAR, BRCFG_PCIE_RX0);
/* Enable Ingress subtractive decode translation */
nwl_bridge_writel(pcie, SET_ISUB_CONTROL, I_ISUB_CONTROL);
/* Enable msg filtering details */
nwl_bridge_writel(pcie, CFG_ENABLE_MSG_FILTER_MASK,
BRCFG_PCIE_RX_MSG_FILTER);
/* This routes the PCIe DMA traffic to go through CCI path */
if (of_dma_is_coherent(dev->of_node))
nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, BRCFG_PCIE_RX1) |
CFG_PCIE_CACHE, BRCFG_PCIE_RX1);
err = nwl_wait_for_link(pcie);
if (err)
return err;
ecam_val = nwl_bridge_readl(pcie, E_ECAM_CAPABILITIES) & E_ECAM_PRESENT;
if (!ecam_val) {
dev_err(dev, "ECAM is not present\n");
return ecam_val;
}
/* Enable ECAM */
nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, E_ECAM_CONTROL) |
E_ECAM_CR_ENABLE, E_ECAM_CONTROL);
nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, E_ECAM_CONTROL) |
(NWL_ECAM_MAX_SIZE << E_ECAM_SIZE_SHIFT),
E_ECAM_CONTROL);
nwl_bridge_writel(pcie, lower_32_bits(pcie->phys_ecam_base),
E_ECAM_BASE_LO);
nwl_bridge_writel(pcie, upper_32_bits(pcie->phys_ecam_base),
E_ECAM_BASE_HI);
if (nwl_pcie_link_up(pcie))
dev_info(dev, "Link is UP\n");
else
dev_info(dev, "Link is DOWN\n");
/* Get misc IRQ number */
pcie->irq_misc = platform_get_irq_byname(pdev, "misc");
if (pcie->irq_misc < 0)
return -EINVAL;
err = devm_request_irq(dev, pcie->irq_misc,
nwl_pcie_misc_handler, IRQF_SHARED,
"nwl_pcie:misc", pcie);
if (err) {
dev_err(dev, "fail to register misc IRQ#%d\n",
pcie->irq_misc);
return err;
}
/* Disable all misc interrupts */
nwl_bridge_writel(pcie, (u32)~MSGF_MISC_SR_MASKALL, MSGF_MISC_MASK);
/* Clear pending misc interrupts */
nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_MISC_STATUS) &
MSGF_MISC_SR_MASKALL, MSGF_MISC_STATUS);
/* Enable all misc interrupts */
nwl_bridge_writel(pcie, MSGF_MISC_SR_MASKALL, MSGF_MISC_MASK);
/* Disable all INTX interrupts */
nwl_bridge_writel(pcie, (u32)~MSGF_LEG_SR_MASKALL, MSGF_LEG_MASK);
/* Clear pending INTX interrupts */
nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_LEG_STATUS) &
MSGF_LEG_SR_MASKALL, MSGF_LEG_STATUS);
/* Enable all INTX interrupts */
nwl_bridge_writel(pcie, MSGF_LEG_SR_MASKALL, MSGF_LEG_MASK);
/* Enable the bridge config interrupt */
nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, BRCFG_INTERRUPT) |
BRCFG_INTERRUPT_MASK, BRCFG_INTERRUPT);
return 0;
}
static int nwl_pcie_parse_dt(struct nwl_pcie *pcie,
struct platform_device *pdev)
{
struct device *dev = pcie->dev;
struct resource *res;
int i;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "breg");
pcie->breg_base = devm_ioremap_resource(dev, res);
if (IS_ERR(pcie->breg_base))
return PTR_ERR(pcie->breg_base);
pcie->phys_breg_base = res->start;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcireg");
pcie->pcireg_base = devm_ioremap_resource(dev, res);
if (IS_ERR(pcie->pcireg_base))
return PTR_ERR(pcie->pcireg_base);
pcie->phys_pcie_reg_base = res->start;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
pcie->ecam_base = devm_pci_remap_cfg_resource(dev, res);
if (IS_ERR(pcie->ecam_base))
return PTR_ERR(pcie->ecam_base);
pcie->phys_ecam_base = res->start;
/* Get intx IRQ number */
pcie->irq_intx = platform_get_irq_byname(pdev, "intx");
if (pcie->irq_intx < 0)
return pcie->irq_intx;
irq_set_chained_handler_and_data(pcie->irq_intx,
nwl_pcie_leg_handler, pcie);
for (i = 0; i < ARRAY_SIZE(pcie->phy); i++) {
pcie->phy[i] = devm_of_phy_get_by_index(dev, dev->of_node, i);
if (PTR_ERR(pcie->phy[i]) == -ENODEV) {
pcie->phy[i] = NULL;
break;
}
if (IS_ERR(pcie->phy[i]))
return PTR_ERR(pcie->phy[i]);
}
return 0;
}
static const struct of_device_id nwl_pcie_of_match[] = {
{ .compatible = "xlnx,nwl-pcie-2.11", },
{}
};
static int nwl_pcie_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct nwl_pcie *pcie;
struct pci_host_bridge *bridge;
int err;
bridge = devm_pci_alloc_host_bridge(dev, sizeof(*pcie));
if (!bridge)
return -ENODEV;
pcie = pci_host_bridge_priv(bridge);
platform_set_drvdata(pdev, pcie);
pcie->dev = dev;
err = nwl_pcie_parse_dt(pcie, pdev);
if (err) {
dev_err(dev, "Parsing DT failed\n");
return err;
}
pcie->clk = devm_clk_get(dev, NULL);
if (IS_ERR(pcie->clk))
return PTR_ERR(pcie->clk);
err = clk_prepare_enable(pcie->clk);
if (err) {
dev_err(dev, "can't enable PCIe ref clock\n");
return err;
}
err = nwl_pcie_phy_enable(pcie);
if (err) {
dev_err(dev, "could not enable PHYs\n");
goto err_clk;
}
err = nwl_pcie_bridge_init(pcie);
if (err) {
dev_err(dev, "HW Initialization failed\n");
goto err_phy;
}
err = nwl_pcie_init_irq_domain(pcie);
if (err) {
dev_err(dev, "Failed creating IRQ Domain\n");
goto err_phy;
}
bridge->sysdata = pcie;
bridge->ops = &nwl_pcie_ops;
if (IS_ENABLED(CONFIG_PCI_MSI)) {
err = nwl_pcie_enable_msi(pcie);
if (err < 0) {
dev_err(dev, "failed to enable MSI support: %d\n", err);
goto err_phy;
}
}
err = pci_host_probe(bridge);
if (!err)
return 0;
err_phy:
nwl_pcie_phy_disable(pcie);
err_clk:
clk_disable_unprepare(pcie->clk);
return err;
}
static void nwl_pcie_remove(struct platform_device *pdev)
{
struct nwl_pcie *pcie = platform_get_drvdata(pdev);
nwl_pcie_phy_disable(pcie);
clk_disable_unprepare(pcie->clk);
}
static struct platform_driver nwl_pcie_driver = {
.driver = {
.name = "nwl-pcie",
.suppress_bind_attrs = true,
.of_match_table = nwl_pcie_of_match,
},
.probe = nwl_pcie_probe,
.remove_new = nwl_pcie_remove,
};
builtin_platform_driver(nwl_pcie_driver);
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