--- /dev/null
+/*
+ * PCIe host controller driver for NWL PCIe Bridge
+ * Based on pcie-xilinx.c, pci-tegra.c
+ *
+ * (C) Copyright 2014 - 2015, Xilinx, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/msi.h>
+#include <linux/of_address.h>
+#include <linux/of_pci.h>
+#include <linux/of_platform.h>
+#include <linux/of_irq.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/irqchip/chained_irq.h>
+
+/* Bridge core config registers */
+#define BRCFG_PCIE_RX0 0x00000000
+#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_SLT_MSG_FWD BIT(5)
+#define CFG_ENABLE_VEN_MSG_FWD BIT(7)
+#define CFG_ENABLE_OTH_MSG_FWD BIT(13)
+#define CFG_ENABLE_VEN_MSG_EN BIT(14)
+#define CFG_ENABLE_VEN_MSG_VEN_INV BIT(15)
+#define CFG_ENABLE_VEN_MSG_VEN_ID GENMASK(31, 16)
+#define CFG_ENABLE_MSG_FILTER_MASK (CFG_ENABLE_PM_MSG_FWD | \
+ CFG_ENABLE_INT_MSG_FWD | \
+ CFG_ENABLE_ERR_MSG_FWD | \
+ CFG_ENABLE_SLT_MSG_FWD | \
+ CFG_ENABLE_VEN_MSG_FWD | \
+ CFG_ENABLE_OTH_MSG_FWD | \
+ CFG_ENABLE_VEN_MSG_EN | \
+ CFG_ENABLE_VEN_MSG_VEN_INV | \
+ CFG_ENABLE_VEN_MSG_VEN_ID)
+
+/* 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_UR_DETECT BIT(20)
+
+#define MSGF_MISC_SR_PCIE_CORE GENMASK(18, 16)
+#define MSGF_MISC_SR_PCIE_CORE_ERR GENMASK(31, 22)
+
+#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_UR_DETECT | \
+ MSGF_MISC_SR_PCIE_CORE | \
+ MSGF_MISC_SR_PCIE_CORE_ERR)
+
+/* 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 BIT(0)
+#define MSGF_MSI_SR_HI_MASK BIT(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 ECAM_BUS_LOC_SHIFT 20
+#define ECAM_DEV_LOC_SHIFT 12
+#define NWL_ECAM_VALUE_DEFAULT 12
+
+#define CFG_DMA_REG_BAR GENMASK(2, 0)
+
+#define INT_PCI_MSI_NR (2 * 32)
+#define INTX_NUM 4
+
+/* 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;
+ unsigned long *bitmap;
+ 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;
+ 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;
+ u32 ecam_value;
+ u8 last_busno;
+ u8 root_busno;
+ struct nwl_msi msi;
+ struct irq_domain *legacy_irq_domain;
+};
+
+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)
+{
+ 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(pcie->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 (bus->number != pcie->root_busno) {
+ if (!nwl_pcie_link_up(pcie))
+ return false;
+ }
+
+ /* Only one device down on each root port */
+ if (bus->number == pcie->root_busno && devfn > 0)
+ 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;
+ int relbus;
+
+ if (!nwl_pcie_valid_device(bus, devfn))
+ return NULL;
+
+ relbus = (bus->number << ECAM_BUS_LOC_SHIFT) |
+ (devfn << ECAM_DEV_LOC_SHIFT);
+
+ return pcie->ecam_base + relbus + 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;
+ 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(pcie->dev, "Received Message FIFO Overflow\n");
+
+ if (misc_stat & MSGF_MISC_SR_SLAVE_ERR)
+ dev_err(pcie->dev, "Slave error\n");
+
+ if (misc_stat & MSGF_MISC_SR_MASTER_ERR)
+ dev_err(pcie->dev, "Master error\n");
+
+ if (misc_stat & MSGF_MISC_SR_I_ADDR_ERR)
+ dev_err(pcie->dev,
+ "In Misc Ingress address translation error\n");
+
+ if (misc_stat & MSGF_MISC_SR_E_ADDR_ERR)
+ dev_err(pcie->dev,
+ "In Misc Egress address translation error\n");
+
+ if (misc_stat & MSGF_MISC_SR_PCIE_CORE_ERR)
+ dev_err(pcie->dev, "PCIe Core error\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;
+ u32 virq;
+
+ 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, INTX_NUM) {
+ virq = irq_find_mapping(pcie->legacy_irq_domain,
+ bit + 1);
+ if (virq)
+ generic_handle_irq(virq);
+ }
+ }
+
+ chained_irq_exit(chip, desc);
+}
+
+static void nwl_pcie_handle_msi_irq(struct nwl_pcie *pcie, u32 status_reg)
+{
+ struct nwl_msi *msi;
+ unsigned long status;
+ u32 bit;
+ u32 virq;
+
+ msi = &pcie->msi;
+
+ while ((status = nwl_bridge_readl(pcie, status_reg)) != 0) {
+ for_each_set_bit(bit, &status, 32) {
+ nwl_bridge_writel(pcie, 1 << bit, status_reg);
+ virq = irq_find_mapping(msi->dev_domain, bit);
+ if (virq)
+ generic_handle_irq(virq);
+ }
+ }
+}
+
+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 int nwl_legacy_map(struct irq_domain *domain, unsigned int irq,
+ irq_hw_number_t hwirq)
+{
+ irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq);
+ irq_set_chip_data(irq, domain->host_data);
+
+ return 0;
+}
+
+static const struct irq_domain_ops legacy_domain_ops = {
+ .map = nwl_legacy_map,
+};
+
+#ifdef CONFIG_PCI_MSI
+static struct irq_chip nwl_msi_irq_chip = {
+ .name = "nwl_pcie:msi",
+ .irq_enable = unmask_msi_irq,
+ .irq_disable = mask_msi_irq,
+ .irq_mask = mask_msi_irq,
+ .irq_unmask = unmask_msi_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_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 int nwl_msi_set_affinity(struct irq_data *irq_data,
+ const struct cpumask *mask, bool force)
+{
+ return -EINVAL;
+}
+
+static struct irq_chip nwl_irq_chip = {
+ .name = "Xilinx MSI",
+ .irq_compose_msi_msg = nwl_compose_msi_msg,
+ .irq_set_affinity = nwl_msi_set_affinity,
+};
+
+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_next_zero_area(msi->bitmap, INT_PCI_MSI_NR, 0,
+ nr_irqs, 0);
+ if (bit >= INT_PCI_MSI_NR) {
+ mutex_unlock(&msi->lock);
+ return -ENOSPC;
+ }
+
+ bitmap_set(msi->bitmap, bit, nr_irqs);
+
+ 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_clear(msi->bitmap, data->hwirq, 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 void nwl_msi_free_irq_domain(struct nwl_pcie *pcie)
+{
+ struct nwl_msi *msi = &pcie->msi;
+
+ if (msi->irq_msi0)
+ irq_set_chained_handler_and_data(msi->irq_msi0, NULL, NULL);
+ if (msi->irq_msi1)
+ irq_set_chained_handler_and_data(msi->irq_msi1, NULL, NULL);
+
+ if (msi->msi_domain)
+ irq_domain_remove(msi->msi_domain);
+ if (msi->dev_domain)
+ irq_domain_remove(msi->dev_domain);
+
+ kfree(msi->bitmap);
+ msi->bitmap = NULL;
+}
+
+static void nwl_pcie_free_irq_domain(struct nwl_pcie *pcie)
+{
+ int i;
+ u32 irq;
+
+ for (i = 0; i < INTX_NUM; i++) {
+ irq = irq_find_mapping(pcie->legacy_irq_domain, i + 1);
+ if (irq > 0)
+ irq_dispose_mapping(irq);
+ }
+ if (pcie->legacy_irq_domain)
+ irq_domain_remove(pcie->legacy_irq_domain);
+
+ nwl_msi_free_irq_domain(pcie);
+}
+
+static int nwl_pcie_init_msi_irq_domain(struct nwl_pcie *pcie)
+{
+#ifdef CONFIG_PCI_MSI
+ struct fwnode_handle *fwnode = of_node_to_fwnode(pcie->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(pcie->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(pcie->dev, "failed to create msi IRQ domain\n");
+ irq_domain_remove(msi->dev_domain);
+ return -ENOMEM;
+ }
+#endif
+ return 0;
+}
+
+static int nwl_pcie_init_irq_domain(struct nwl_pcie *pcie)
+{
+ struct device_node *node = pcie->dev->of_node;
+ struct device_node *legacy_intc_node;
+
+ legacy_intc_node = of_get_next_child(node, NULL);
+ if (!legacy_intc_node) {
+ dev_err(pcie->dev, "No legacy intc node found\n");
+ return -EINVAL;
+ }
+
+ pcie->legacy_irq_domain = irq_domain_add_linear(legacy_intc_node,
+ INTX_NUM,
+ &legacy_domain_ops,
+ pcie);
+
+ if (!pcie->legacy_irq_domain) {
+ dev_err(pcie->dev, "failed to create IRQ domain\n");
+ return -ENOMEM;
+ }
+
+ nwl_pcie_init_msi_irq_domain(pcie);
+ return 0;
+}
+
+static int nwl_pcie_enable_msi(struct nwl_pcie *pcie, struct pci_bus *bus)
+{
+ struct platform_device *pdev = to_platform_device(pcie->dev);
+ struct nwl_msi *msi = &pcie->msi;
+ unsigned long base;
+ int ret;
+ int size = BITS_TO_LONGS(INT_PCI_MSI_NR) * sizeof(long);
+
+ mutex_init(&msi->lock);
+
+ msi->bitmap = kzalloc(size, GFP_KERNEL);
+ if (!msi->bitmap)
+ return -ENOMEM;
+
+ /* Get msi_1 IRQ number */
+ msi->irq_msi1 = platform_get_irq_byname(pdev, "msi1");
+ if (msi->irq_msi1 < 0) {
+ dev_err(&pdev->dev, "failed to get IRQ#%d\n", msi->irq_msi1);
+ ret = -EINVAL;
+ goto err;
+ }
+
+ 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) {
+ dev_err(&pdev->dev, "failed to get IRQ#%d\n", msi->irq_msi0);
+ ret = -EINVAL;
+ goto err;
+ }
+
+ 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(pcie->dev, "MSI not present\n");
+ ret = -EIO;
+ goto err;
+ }
+
+ /* 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, (u32)~MSGF_MSI_SR_HI_MASK, 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, (u32)~MSGF_MSI_SR_LO_MASK, 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;
+err:
+ kfree(msi->bitmap);
+ msi->bitmap = NULL;
+ return ret;
+}
+
+static int nwl_pcie_bridge_init(struct nwl_pcie *pcie)
+{
+ struct platform_device *pdev = to_platform_device(pcie->dev);
+ u32 breg_val, ecam_val, first_busno = 0;
+ int err;
+
+ breg_val = nwl_bridge_readl(pcie, E_BREG_CAPABILITIES) & BREG_PRESENT;
+ if (!breg_val) {
+ dev_err(pcie->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);
+
+ 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(pcie->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) |
+ (pcie->ecam_value << 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);
+
+ /* Get bus range */
+ ecam_val = nwl_bridge_readl(pcie, E_ECAM_CONTROL);
+ pcie->last_busno = (ecam_val & E_ECAM_SIZE_LOC) >> E_ECAM_SIZE_SHIFT;
+ /* Write primary, secondary and subordinate bus numbers */
+ ecam_val = first_busno;
+ ecam_val |= (first_busno + 1) << 8;
+ ecam_val |= (pcie->last_busno << E_ECAM_SIZE_SHIFT);
+ writel(ecam_val, (pcie->ecam_base + PCI_PRIMARY_BUS));
+
+ if (nwl_pcie_link_up(pcie))
+ dev_info(pcie->dev, "Link is UP\n");
+ else
+ dev_info(pcie->dev, "Link is DOWN\n");
+
+ /* Get misc IRQ number */
+ pcie->irq_misc = platform_get_irq_byname(pdev, "misc");
+ if (pcie->irq_misc < 0) {
+ dev_err(&pdev->dev, "failed to get misc IRQ %d\n",
+ pcie->irq_misc);
+ return -EINVAL;
+ }
+
+ err = devm_request_irq(pcie->dev, pcie->irq_misc,
+ nwl_pcie_misc_handler, IRQF_SHARED,
+ "nwl_pcie:misc", pcie);
+ if (err) {
+ dev_err(pcie->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 legacy interrupts */
+ nwl_bridge_writel(pcie, (u32)~MSGF_LEG_SR_MASKALL, MSGF_LEG_MASK);
+
+ /* Clear pending legacy interrupts */
+ nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_LEG_STATUS) &
+ MSGF_LEG_SR_MASKALL, MSGF_LEG_STATUS);
+
+ /* Enable all legacy 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_node *node = pcie->dev->of_node;
+ struct resource *res;
+ const char *type;
+
+ /* Check for device type */
+ type = of_get_property(node, "device_type", NULL);
+ if (!type || strcmp(type, "pci")) {
+ dev_err(pcie->dev, "invalid \"device_type\" %s\n", type);
+ return -EINVAL;
+ }
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "breg");
+ pcie->breg_base = devm_ioremap_resource(pcie->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(pcie->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_ioremap_resource(pcie->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) {
+ dev_err(&pdev->dev, "failed to get intx IRQ %d\n",
+ pcie->irq_intx);
+ return -EINVAL;
+ }
+
+ irq_set_chained_handler_and_data(pcie->irq_intx,
+ nwl_pcie_leg_handler, pcie);
+
+ 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_node *node = pdev->dev.of_node;
+ struct nwl_pcie *pcie;
+ struct pci_bus *bus;
+ struct pci_bus *child;
+ int err;
+ resource_size_t iobase = 0;
+ LIST_HEAD(res);
+
+ pcie = devm_kzalloc(&pdev->dev, sizeof(*pcie), GFP_KERNEL);
+ if (!pcie)
+ return -ENOMEM;
+
+ pcie->dev = &pdev->dev;
+ pcie->ecam_value = NWL_ECAM_VALUE_DEFAULT;
+
+ err = nwl_pcie_parse_dt(pcie, pdev);
+ if (err) {
+ dev_err(pcie->dev, "Parsing DT failed\n");
+ return err;
+ }
+
+ err = nwl_pcie_bridge_init(pcie);
+ if (err) {
+ dev_err(pcie->dev, "HW Initalization failed\n");
+ return err;
+ }
+
+ err = of_pci_get_host_bridge_resources(node, 0, 0xff, &res, &iobase);
+ if (err) {
+ pr_err("Getting bridge resources failed\n");
+ return err;
+ }
+
+ err = nwl_pcie_init_irq_domain(pcie);
+ if (err) {
+ dev_err(pcie->dev, "Failed creating IRQ Domain\n");
+ return err;
+ }
+
+ bus = pci_create_root_bus(&pdev->dev, pcie->root_busno,
+ &nwl_pcie_ops, pcie, &res);
+ if (!bus)
+ return -ENOMEM;
+
+ if (IS_ENABLED(CONFIG_PCI_MSI)) {
+ err = nwl_pcie_enable_msi(pcie, bus);
+ if (err < 0) {
+ dev_err(&pdev->dev,
+ "failed to enable MSI support: %d\n", err);
+ return err;
+ }
+ }
+ pci_scan_child_bus(bus);
+ pci_assign_unassigned_bus_resources(bus);
+ list_for_each_entry(child, &bus->children, node)
+ pcie_bus_configure_settings(child);
+ pci_bus_add_devices(bus);
+ platform_set_drvdata(pdev, pcie);
+ return 0;
+}
+
+static int nwl_pcie_remove(struct platform_device *pdev)
+{
+ struct nwl_pcie *pcie = platform_get_drvdata(pdev);
+
+ nwl_pcie_free_irq_domain(pcie);
+ platform_set_drvdata(pdev, NULL);
+ return 0;
+}
+
+static struct platform_driver nwl_pcie_driver = {
+ .driver = {
+ .name = "nwl-pcie",
+ .of_match_table = nwl_pcie_of_match,
+ },
+ .probe = nwl_pcie_probe,
+ .remove = nwl_pcie_remove,
+};
+module_platform_driver(nwl_pcie_driver);
+
+MODULE_AUTHOR("Xilinx, Inc");
+MODULE_DESCRIPTION("NWL PCIe driver");
+MODULE_LICENSE("GPL");
projects / cascardo / linux.git / commitdiff