From: Subrahmanya Lingappa <l.subrahmanya@mobiveil.co.in>
Date: Wed, 30 May 2018 10:34:03 -0500
Subject: PCI: mobiveil: Add Mobiveil PCIe Host Bridge IP driver
Git-commit: 9af6bcb11e121701509ce6a2d03fac5c694bd9fb
Patch-mainline: v4.18-rc1
References: fate#326572
Add a driver for Mobiveil AXI PCIe Host Bridge Soft IP - GPEX 4.0,
a PCIe gen4 IP. This IP has upto 8 outbound and inbound windows
for the address translation.
Signed-off-by: Subrahmanya Lingappa <l.subrahmanya@mobiveil.co.in>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
[bhelgaas: fold in mobiveil_pcie_of_match[] NULL termination from Wei
Yongjun <weiyongjun1@huawei.com>]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
drivers/pci/host/pcie-mobiveil.c | 669 +++++++++++++++++++++++++++++++++++++++
1 file changed, 669 insertions(+)
create mode 100644 drivers/pci/host/pcie-mobiveil.c
diff --git a/drivers/pci/host/pcie-mobiveil.c b/drivers/pci/host/pcie-mobiveil.c
new file mode 100644
index 000000000000..2fa3ad60049a
--- /dev/null
+++ b/drivers/pci/host/pcie-mobiveil.c
@@ -0,0 +1,669 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCIe host controller driver for Mobiveil PCIe Host controller
+ *
+ * Copyright (c) 2018 Mobiveil Inc.
+ * Author: Subrahmanya Lingappa <l.subrahmanya@mobiveil.co.in>
+ */
+
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/irqdomain.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/of_pci.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+/* register offsets and bit positions */
+
+/*
+ * translation tables are grouped into windows, each window registers are
+ * grouped into blocks of 4 or 16 registers each
+ */
+#define PAB_REG_BLOCK_SIZE 16
+#define PAB_EXT_REG_BLOCK_SIZE 4
+
+#define PAB_REG_ADDR(offset, win) (offset + (win * PAB_REG_BLOCK_SIZE))
+#define PAB_EXT_REG_ADDR(offset, win) (offset + (win * PAB_EXT_REG_BLOCK_SIZE))
+
+#define LTSSM_STATUS 0x0404
+#define LTSSM_STATUS_L0_MASK 0x3f
+#define LTSSM_STATUS_L0 0x2d
+
+#define PAB_CTRL 0x0808
+#define AMBA_PIO_ENABLE_SHIFT 0
+#define PEX_PIO_ENABLE_SHIFT 1
+#define PAGE_SEL_SHIFT 13
+#define PAGE_SEL_MASK 0x3f
+#define PAGE_LO_MASK 0x3ff
+#define PAGE_SEL_EN 0xc00
+#define PAGE_SEL_OFFSET_SHIFT 10
+
+#define PAB_AXI_PIO_CTRL 0x0840
+#define APIO_EN_MASK 0xf
+
+#define PAB_PEX_PIO_CTRL 0x08c0
+#define PIO_ENABLE_SHIFT 0
+
+#define PAB_INTP_AMBA_MISC_ENB 0x0b0c
+#define PAB_INTP_AMBA_MISC_STAT 0x0b1c
+#define PAB_INTP_INTX_MASK 0x01e0
+
+#define PAB_AXI_AMAP_CTRL(win) PAB_REG_ADDR(0x0ba0, win)
+#define WIN_ENABLE_SHIFT 0
+#define WIN_TYPE_SHIFT 1
+
+#define PAB_EXT_AXI_AMAP_SIZE(win) PAB_EXT_REG_ADDR(0xbaf0, win)
+
+#define PAB_AXI_AMAP_AXI_WIN(win) PAB_REG_ADDR(0x0ba4, win)
+#define AXI_WINDOW_ALIGN_MASK 3
+
+#define PAB_AXI_AMAP_PEX_WIN_L(win) PAB_REG_ADDR(0x0ba8, win)
+#define PAB_BUS_SHIFT 24
+#define PAB_DEVICE_SHIFT 19
+#define PAB_FUNCTION_SHIFT 16
+
+#define PAB_AXI_AMAP_PEX_WIN_H(win) PAB_REG_ADDR(0x0bac, win)
+#define PAB_INTP_AXI_PIO_CLASS 0x474
+
+#define PAB_PEX_AMAP_CTRL(win) PAB_REG_ADDR(0x4ba0, win)
+#define AMAP_CTRL_EN_SHIFT 0
+#define AMAP_CTRL_TYPE_SHIFT 1
+
+#define PAB_EXT_PEX_AMAP_SIZEN(win) PAB_EXT_REG_ADDR(0xbef0, win)
+#define PAB_PEX_AMAP_AXI_WIN(win) PAB_REG_ADDR(0x4ba4, win)
+#define PAB_PEX_AMAP_PEX_WIN_L(win) PAB_REG_ADDR(0x4ba8, win)
+#define PAB_PEX_AMAP_PEX_WIN_H(win) PAB_REG_ADDR(0x4bac, win)
+
+/* starting offset of INTX bits in status register */
+#define PAB_INTX_START 5
+
+/* outbound and inbound window definitions */
+#define WIN_NUM_0 0
+#define WIN_NUM_1 1
+#define CFG_WINDOW_TYPE 0
+#define IO_WINDOW_TYPE 1
+#define MEM_WINDOW_TYPE 2
+#define IB_WIN_SIZE (256 * 1024 * 1024 * 1024)
+#define MAX_PIO_WINDOWS 8
+
+/* Parameters for the waiting for link up routine */
+#define LINK_WAIT_MAX_RETRIES 10
+#define LINK_WAIT_MIN 90000
+#define LINK_WAIT_MAX 100000
+
+struct mobiveil_pcie {
+ struct platform_device *pdev;
+ struct list_head resources;
+ void __iomem *config_axi_slave_base; /* endpoint config base */
+ void __iomem *csr_axi_slave_base; /* root port config base */
+ void __iomem *pcie_reg_base; /* Physical PCIe Controller Base */
+ struct irq_domain *intx_domain;
+ raw_spinlock_t intx_mask_lock;
+ int irq;
+ int apio_wins;
+ int ppio_wins;
+ int ob_wins_configured; /* configured outbound windows */
+ int ib_wins_configured; /* configured inbound windows */
+ struct resource *ob_io_res;
+ char root_bus_nr;
+};
+
+static inline void csr_writel(struct mobiveil_pcie *pcie, const u32 value,
+ const u32 reg)
+{
+ writel_relaxed(value, pcie->csr_axi_slave_base + reg);
+}
+
+static inline u32 csr_readl(struct mobiveil_pcie *pcie, const u32 reg)
+{
+ return readl_relaxed(pcie->csr_axi_slave_base + reg);
+}
+
+static bool mobiveil_pcie_link_up(struct mobiveil_pcie *pcie)
+{
+ return (csr_readl(pcie, LTSSM_STATUS) &
+ LTSSM_STATUS_L0_MASK) == LTSSM_STATUS_L0;
+}
+
+static bool mobiveil_pcie_valid_device(struct pci_bus *bus, unsigned int devfn)
+{
+ struct mobiveil_pcie *pcie = bus->sysdata;
+
+ /* Only one device down on each root port */
+ if ((bus->number == pcie->root_bus_nr) && (devfn > 0))
+ return false;
+
+ /*
+ * Do not read more than one device on the bus directly
+ * attached to RC
+ */
+ if ((bus->primary == pcie->root_bus_nr) && (devfn > 0))
+ return false;
+
+ return true;
+}
+
+/*
+ * mobiveil_pcie_map_bus - routine to get the configuration base of either
+ * root port or endpoint
+ */
+static void __iomem *mobiveil_pcie_map_bus(struct pci_bus *bus,
+ unsigned int devfn, int where)
+{
+ struct mobiveil_pcie *pcie = bus->sysdata;
+
+ if (!mobiveil_pcie_valid_device(bus, devfn))
+ return NULL;
+
+ if (bus->number == pcie->root_bus_nr) {
+ /* RC config access */
+ return pcie->csr_axi_slave_base + where;
+ }
+
+ /*
+ * EP config access (in Config/APIO space)
+ * Program PEX Address base (31..16 bits) with appropriate value
+ * (BDF) in PAB_AXI_AMAP_PEX_WIN_L0 Register.
+ * Relies on pci_lock serialization
+ */
+ csr_writel(pcie, bus->number << PAB_BUS_SHIFT |
+ PCI_SLOT(devfn) << PAB_DEVICE_SHIFT |
+ PCI_FUNC(devfn) << PAB_FUNCTION_SHIFT,
+ PAB_AXI_AMAP_PEX_WIN_L(WIN_NUM_0));
+ return pcie->config_axi_slave_base + where;
+}
+
+static struct pci_ops mobiveil_pcie_ops = {
+ .map_bus = mobiveil_pcie_map_bus,
+ .read = pci_generic_config_read,
+ .write = pci_generic_config_write,
+};
+
+static void mobiveil_pcie_isr(struct irq_desc *desc)
+{
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+ struct mobiveil_pcie *pcie = irq_desc_get_handler_data(desc);
+ struct device *dev = &pcie->pdev->dev;
+ u32 intr_status;
+ unsigned long shifted_status;
+ u32 bit, virq, val, mask;
+
+ /*
+ * The core provides interrupt for INTx.
+ * So we'll read INTx status.
+ */
+
+ chained_irq_enter(chip, desc);
+
+ /* read INTx status */
+ val = csr_readl(pcie, PAB_INTP_AMBA_MISC_STAT);
+ mask = csr_readl(pcie, PAB_INTP_AMBA_MISC_ENB);
+ intr_status = val & mask;
+
+ /* Handle INTx */
+ if (intr_status & PAB_INTP_INTX_MASK) {
+ shifted_status = csr_readl(pcie, PAB_INTP_AMBA_MISC_STAT) >>
+ PAB_INTX_START;
+ do {
+ for_each_set_bit(bit, &shifted_status, PCI_NUM_INTX) {
+ virq = irq_find_mapping(pcie->intx_domain,
+ bit + 1);
+ if (virq)
+ generic_handle_irq(virq);
+ else
+ dev_err_ratelimited(dev,
+ "unexpected IRQ, INT%d\n", bit);
+
+ /* clear interrupt */
+ csr_writel(pcie,
+ shifted_status << PAB_INTX_START,
+ PAB_INTP_AMBA_MISC_STAT);
+ }
+ } while ((shifted_status >> PAB_INTX_START) != 0);
+ }
+
+ /* Clear the interrupt status */
+ csr_writel(pcie, intr_status, PAB_INTP_AMBA_MISC_STAT);
+ chained_irq_exit(chip, desc);
+}
+
+static int mobiveil_pcie_parse_dt(struct mobiveil_pcie *pcie)
+{
+ struct device *dev = &pcie->pdev->dev;
+ struct platform_device *pdev = pcie->pdev;
+ struct device_node *node = dev->of_node;
+ struct resource *res;
+ const char *type;
+
+ type = of_get_property(node, "device_type", NULL);
+ if (!type || strcmp(type, "pci")) {
+ dev_err(dev, "invalid \"device_type\" %s\n", type);
+ return -EINVAL;
+ }
+
+ /* map config resource */
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+ "config_axi_slave");
+ pcie->config_axi_slave_base = devm_pci_remap_cfg_resource(dev, res);
+ if (IS_ERR(pcie->config_axi_slave_base))
+ return PTR_ERR(pcie->config_axi_slave_base);
+ pcie->ob_io_res = res;
+
+ /* map csr resource */
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+ "csr_axi_slave");
+ pcie->csr_axi_slave_base = devm_pci_remap_cfg_resource(dev, res);
+ if (IS_ERR(pcie->csr_axi_slave_base))
+ return PTR_ERR(pcie->csr_axi_slave_base);
+ pcie->pcie_reg_base = res->start;
+
+ /* read the number of windows requested */
+ if (of_property_read_u32(node, "apio-wins", &pcie->apio_wins))
+ pcie->apio_wins = MAX_PIO_WINDOWS;
+
+ if (of_property_read_u32(node, "ppio-wins", &pcie->ppio_wins))
+ pcie->ppio_wins = MAX_PIO_WINDOWS;
+
+ pcie->irq = platform_get_irq(pdev, 0);
+ if (pcie->irq <= 0) {
+ dev_err(dev, "failed to map IRQ: %d\n", pcie->irq);
+ return -ENODEV;
+ }
+
+ irq_set_chained_handler_and_data(pcie->irq, mobiveil_pcie_isr, pcie);
+
+ return 0;
+}
+
+/*
+ * select_paged_register - routine to access paged register of root complex
+ *
+ * registers of RC are paged, for this scheme to work
+ * extracted higher 6 bits of the offset will be written to pg_sel
+ * field of PAB_CTRL register and rest of the lower 10 bits enabled with
+ * PAGE_SEL_EN are used as offset of the register.
+ */
+static void select_paged_register(struct mobiveil_pcie *pcie, u32 offset)
+{
+ int pab_ctrl_dw, pg_sel;
+
+ /* clear pg_sel field */
+ pab_ctrl_dw = csr_readl(pcie, PAB_CTRL);
+ pab_ctrl_dw = (pab_ctrl_dw & ~(PAGE_SEL_MASK << PAGE_SEL_SHIFT));
+
+ /* set pg_sel field */
+ pg_sel = (offset >> PAGE_SEL_OFFSET_SHIFT) & PAGE_SEL_MASK;
+ pab_ctrl_dw |= ((pg_sel << PAGE_SEL_SHIFT));
+ csr_writel(pcie, pab_ctrl_dw, PAB_CTRL);
+}
+
+static void write_paged_register(struct mobiveil_pcie *pcie,
+ u32 val, u32 offset)
+{
+ u32 off = (offset & PAGE_LO_MASK) | PAGE_SEL_EN;
+
+ select_paged_register(pcie, offset);
+ csr_writel(pcie, val, off);
+}
+
+static u32 read_paged_register(struct mobiveil_pcie *pcie, u32 offset)
+{
+ u32 off = (offset & PAGE_LO_MASK) | PAGE_SEL_EN;
+
+ select_paged_register(pcie, offset);
+ return csr_readl(pcie, off);
+}
+
+static void program_ib_windows(struct mobiveil_pcie *pcie, int win_num,
+ int pci_addr, u32 type, u64 size)
+{
+ int pio_ctrl_val;
+ int amap_ctrl_dw;
+ u64 size64 = ~(size - 1);
+
+ if ((pcie->ib_wins_configured + 1) > pcie->ppio_wins) {
+ dev_err(&pcie->pdev->dev,
+ "ERROR: max inbound windows reached !\n");
+ return;
+ }
+
+ pio_ctrl_val = csr_readl(pcie, PAB_PEX_PIO_CTRL);
+ csr_writel(pcie,
+ pio_ctrl_val | (1 << PIO_ENABLE_SHIFT), PAB_PEX_PIO_CTRL);
+ amap_ctrl_dw = read_paged_register(pcie, PAB_PEX_AMAP_CTRL(win_num));
+ amap_ctrl_dw = (amap_ctrl_dw | (type << AMAP_CTRL_TYPE_SHIFT));
+ amap_ctrl_dw = (amap_ctrl_dw | (1 << AMAP_CTRL_EN_SHIFT));
+
+ write_paged_register(pcie, amap_ctrl_dw | lower_32_bits(size64),
+ PAB_PEX_AMAP_CTRL(win_num));
+
+ write_paged_register(pcie, upper_32_bits(size64),
+ PAB_EXT_PEX_AMAP_SIZEN(win_num));
+
+ write_paged_register(pcie, pci_addr, PAB_PEX_AMAP_AXI_WIN(win_num));
+ write_paged_register(pcie, pci_addr, PAB_PEX_AMAP_PEX_WIN_L(win_num));
+ write_paged_register(pcie, 0, PAB_PEX_AMAP_PEX_WIN_H(win_num));
+}
+
+/*
+ * routine to program the outbound windows
+ */
+static void program_ob_windows(struct mobiveil_pcie *pcie, int win_num,
+ u64 cpu_addr, u64 pci_addr, u32 config_io_bit, u64 size)
+{
+
+ u32 value, type;
+ u64 size64 = ~(size - 1);
+
+ if ((pcie->ob_wins_configured + 1) > pcie->apio_wins) {
+ dev_err(&pcie->pdev->dev,
+ "ERROR: max outbound windows reached !\n");
+ return;
+ }
+
+ /*
+ * program Enable Bit to 1, Type Bit to (00) base 2, AXI Window Size Bit
+ * to 4 KB in PAB_AXI_AMAP_CTRL register
+ */
+ type = config_io_bit;
+ value = csr_readl(pcie, PAB_AXI_AMAP_CTRL(win_num));
+ csr_writel(pcie, 1 << WIN_ENABLE_SHIFT | type << WIN_TYPE_SHIFT |
+ lower_32_bits(size64), PAB_AXI_AMAP_CTRL(win_num));
+
+ write_paged_register(pcie, upper_32_bits(size64),
+ PAB_EXT_AXI_AMAP_SIZE(win_num));
+
+ /*
+ * program AXI window base with appropriate value in
+ * PAB_AXI_AMAP_AXI_WIN0 register
+ */
+ value = csr_readl(pcie, PAB_AXI_AMAP_AXI_WIN(win_num));
+ csr_writel(pcie, cpu_addr & (~AXI_WINDOW_ALIGN_MASK),
+ PAB_AXI_AMAP_AXI_WIN(win_num));
+
+ value = csr_readl(pcie, PAB_AXI_AMAP_PEX_WIN_H(win_num));
+
+ csr_writel(pcie, lower_32_bits(pci_addr),
+ PAB_AXI_AMAP_PEX_WIN_L(win_num));
+ csr_writel(pcie, upper_32_bits(pci_addr),
+ PAB_AXI_AMAP_PEX_WIN_H(win_num));
+
+ pcie->ob_wins_configured++;
+}
+
+static int mobiveil_bringup_link(struct mobiveil_pcie *pcie)
+{
+ int retries;
+
+ /* check if the link is up or not */
+ for (retries = 0; retries < LINK_WAIT_MAX_RETRIES; retries++) {
+ if (mobiveil_pcie_link_up(pcie))
+ return 0;
+
+ usleep_range(LINK_WAIT_MIN, LINK_WAIT_MAX);
+ }
+ dev_err(&pcie->pdev->dev, "link never came up\n");
+ return -ETIMEDOUT;
+}
+
+static int mobiveil_host_init(struct mobiveil_pcie *pcie)
+{
+ u32 value, pab_ctrl, type = 0;
+ int err;
+ struct resource_entry *win, *tmp;
+
+ err = mobiveil_bringup_link(pcie);
+ if (err) {
+ dev_info(&pcie->pdev->dev, "link bring-up failed\n");
+ return err;
+ }
+
+ /*
+ * program Bus Master Enable Bit in Command Register in PAB Config
+ * Space
+ */
+ value = csr_readl(pcie, PCI_COMMAND);
+ csr_writel(pcie, value | PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
+ PCI_COMMAND_MASTER, PCI_COMMAND);
+
+ /*
+ * program PIO Enable Bit to 1 (and PEX PIO Enable to 1) in PAB_CTRL
+ * register
+ */
+ pab_ctrl = csr_readl(pcie, PAB_CTRL);
+ csr_writel(pcie, pab_ctrl | (1 << AMBA_PIO_ENABLE_SHIFT) |
+ (1 << PEX_PIO_ENABLE_SHIFT), PAB_CTRL);
+
+ csr_writel(pcie, PAB_INTP_INTX_MASK, PAB_INTP_AMBA_MISC_ENB);
+
+ /*
+ * program PIO Enable Bit to 1 and Config Window Enable Bit to 1 in
+ * PAB_AXI_PIO_CTRL Register
+ */
+ value = csr_readl(pcie, PAB_AXI_PIO_CTRL);
+ csr_writel(pcie, value | APIO_EN_MASK, PAB_AXI_PIO_CTRL);
+
+ /*
+ * we'll program one outbound window for config reads and
+ * another default inbound window for all the upstream traffic
+ * rest of the outbound windows will be configured according to
+ * the "ranges" field defined in device tree
+ */
+
+ /* config outbound translation window */
+ program_ob_windows(pcie, pcie->ob_wins_configured,
+ pcie->ob_io_res->start, 0, CFG_WINDOW_TYPE,
+ resource_size(pcie->ob_io_res));
+
+ /* memory inbound translation window */
+ program_ib_windows(pcie, WIN_NUM_1, 0, MEM_WINDOW_TYPE, IB_WIN_SIZE);
+
+ /* Get the I/O and memory ranges from DT */
+ resource_list_for_each_entry_safe(win, tmp, &pcie->resources) {
+ type = 0;
+ if (resource_type(win->res) == IORESOURCE_MEM)
+ type = MEM_WINDOW_TYPE;
+ if (resource_type(win->res) == IORESOURCE_IO)
+ type = IO_WINDOW_TYPE;
+ if (type) {
+ /* configure outbound translation window */
+ program_ob_windows(pcie, pcie->ob_wins_configured,
+ win->res->start, 0, type,
+ resource_size(win->res));
+ }
+ }
+
+ return err;
+}
+
+static void mobiveil_mask_intx_irq(struct irq_data *data)
+{
+ struct irq_desc *desc = irq_to_desc(data->irq);
+ struct mobiveil_pcie *pcie;
+ unsigned long flags;
+ u32 mask, shifted_val;
+
+ pcie = irq_desc_get_chip_data(desc);
+ mask = 1 << ((data->hwirq + PAB_INTX_START) - 1);
+ raw_spin_lock_irqsave(&pcie->intx_mask_lock, flags);
+ shifted_val = csr_readl(pcie, PAB_INTP_AMBA_MISC_ENB);
+ csr_writel(pcie, (shifted_val & (~mask)), PAB_INTP_AMBA_MISC_ENB);
+ raw_spin_unlock_irqrestore(&pcie->intx_mask_lock, flags);
+}
+
+static void mobiveil_unmask_intx_irq(struct irq_data *data)
+{
+ struct irq_desc *desc = irq_to_desc(data->irq);
+ struct mobiveil_pcie *pcie;
+ unsigned long flags;
+ u32 shifted_val, mask;
+
+ pcie = irq_desc_get_chip_data(desc);
+ mask = 1 << ((data->hwirq + PAB_INTX_START) - 1);
+ raw_spin_lock_irqsave(&pcie->intx_mask_lock, flags);
+ shifted_val = csr_readl(pcie, PAB_INTP_AMBA_MISC_ENB);
+ csr_writel(pcie, (shifted_val | mask), PAB_INTP_AMBA_MISC_ENB);
+ raw_spin_unlock_irqrestore(&pcie->intx_mask_lock, flags);
+}
+
+static struct irq_chip intx_irq_chip = {
+ .name = "mobiveil_pcie:intx",
+ .irq_enable = mobiveil_unmask_intx_irq,
+ .irq_disable = mobiveil_mask_intx_irq,
+ .irq_mask = mobiveil_mask_intx_irq,
+ .irq_unmask = mobiveil_unmask_intx_irq,
+};
+
+/* routine to setup the INTx related data */
+static int mobiveil_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
+ irq_hw_number_t hwirq)
+{
+ irq_set_chip_and_handler(irq, &intx_irq_chip, handle_level_irq);
+ irq_set_chip_data(irq, domain->host_data);
+ return 0;
+}
+
+/* INTx domain operations structure */
+static const struct irq_domain_ops intx_domain_ops = {
+ .map = mobiveil_pcie_intx_map,
+};
+
+static int mobiveil_pcie_init_irq_domain(struct mobiveil_pcie *pcie)
+{
+ struct device *dev = &pcie->pdev->dev;
+ struct device_node *node = dev->of_node;
+ int ret;
+
+ /* setup INTx */
+ pcie->intx_domain = irq_domain_add_linear(node,
+ PCI_NUM_INTX, &intx_domain_ops, pcie);
+
+ if (!pcie->intx_domain) {
+ dev_err(dev, "Failed to get a INTx IRQ domain\n");
+ return -ENODEV;
+ }
+
+ raw_spin_lock_init(&pcie->intx_mask_lock);
+
+ return 0;
+}
+
+static int mobiveil_pcie_probe(struct platform_device *pdev)
+{
+ struct mobiveil_pcie *pcie;
+ struct pci_bus *bus;
+ struct pci_bus *child;
+ struct pci_host_bridge *bridge;
+ struct device *dev = &pdev->dev;
+ struct device_node *node = dev->of_node;
+ resource_size_t iobase;
+ int ret;
+
+ /* allocate the PCIe port */
+ bridge = devm_pci_alloc_host_bridge(dev, sizeof(*pcie));
+ if (!bridge)
+ return -ENODEV;
+
+ pcie = pci_host_bridge_priv(bridge);
+ if (!pcie)
+ return -ENOMEM;
+
+ pcie->pdev = pdev;
+
+ ret = mobiveil_pcie_parse_dt(pcie);
+ if (ret) {
+ dev_err(dev, "Parsing DT failed, ret: %x\n", ret);
+ return ret;
+ }
+
+ INIT_LIST_HEAD(&pcie->resources);
+
+ /* parse the host bridge base addresses from the device tree file */
+ ret = of_pci_get_host_bridge_resources(node, 0, 0xff,
+ &pcie->resources, &iobase);
+ if (ret) {
+ dev_err(dev, "Getting bridge resources failed\n");
+ return -ENOMEM;
+ }
+
+ /*
+ * configure all inbound and outbound windows and prepare the RC for
+ * config access
+ */
+ ret = mobiveil_host_init(pcie);
+ if (ret) {
+ dev_err(dev, "Failed to initialize host\n");
+ goto error;
+ }
+
+ /* fixup for PCIe class register */
+ csr_writel(pcie, 0x060402ab, PAB_INTP_AXI_PIO_CLASS);
+
+ /* initialize the IRQ domains */
+ ret = mobiveil_pcie_init_irq_domain(pcie);
+ if (ret) {
+ dev_err(dev, "Failed creating IRQ Domain\n");
+ goto error;
+ }
+
+ ret = devm_request_pci_bus_resources(dev, &pcie->resources);
+ if (ret)
+ goto error;
+
+ /* Initialize bridge */
+ list_splice_init(&pcie->resources, &bridge->windows);
+ bridge->dev.parent = dev;
+ bridge->sysdata = pcie;
+ bridge->busnr = pcie->root_bus_nr;
+ bridge->ops = &mobiveil_pcie_ops;
+ bridge->map_irq = of_irq_parse_and_map_pci;
+ bridge->swizzle_irq = pci_common_swizzle;
+
+ /* setup the kernel resources for the newly added PCIe root bus */
+ ret = pci_scan_root_bus_bridge(bridge);
+ if (ret)
+ goto error;
+
+ bus = bridge->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);
+
+ return 0;
+error:
+ pci_free_resource_list(&pcie->resources);
+ return ret;
+}
+
+static const struct of_device_id mobiveil_pcie_of_match[] = {
+ {.compatible = "mbvl,gpex40-pcie",},
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, mobiveil_pcie_of_match);
+
+static struct platform_driver mobiveil_pcie_driver = {
+ .probe = mobiveil_pcie_probe,
+ .driver = {
+ .name = "mobiveil-pcie",
+ .of_match_table = mobiveil_pcie_of_match,
+ .suppress_bind_attrs = true,
+ },
+};
+
+builtin_platform_driver(mobiveil_pcie_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Mobiveil PCIe host controller driver");
+MODULE_AUTHOR("Subrahmanya Lingappa <l.subrahmanya@mobiveil.co.in>");
--
2.11.0