Re: [PATCHv10 01/13] PCI: mobiveil: Introduce a new structure mobiveil_root_port

From: Andrew Murray
Date: Thu Feb 20 2020 - 12:13:07 EST

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On Thu, Feb 13, 2020 at 12:06:32PM +0800, Zhiqiang Hou wrote:
> From: Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx>
>
> The Mobiveil PCIe controller can work in either Root Complex
> mode or Endpoint mode. So introduce a new structure
> mobiveil_root_port, and abstract the RC related members into
> it such that the code can be used by both mode.
>
> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx>

Reviewed-by: Andrew Murray <amurray@xxxxxxxxxxxxxxxxxxxx>

> ---
> V10:
> - Refined the subject and change log.
> - Added prefix mobiveil to the root port structure.
>
> drivers/pci/controller/pcie-mobiveil.c | 99 ++++++++++++++++----------
> 1 file changed, 60 insertions(+), 39 deletions(-)
>
> diff --git a/drivers/pci/controller/pcie-mobiveil.c b/drivers/pci/controller/pcie-mobiveil.c
> index 3a696ca45bfa..d4de560cd711 100644
> --- a/drivers/pci/controller/pcie-mobiveil.c
> +++ b/drivers/pci/controller/pcie-mobiveil.c
> @@ -3,7 +3,10 @@
> * PCIe host controller driver for Mobiveil PCIe Host controller
> *
> * Copyright (c) 2018 Mobiveil Inc.
> + * Copyright 2019-2020 NXP
> + *
> * Author: Subrahmanya Lingappa <l.subrahmanya@xxxxxxxxxxxxxx>
> + * Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx>
> */
>
> #include <linux/delay.h>
> @@ -138,22 +141,27 @@ struct mobiveil_msi { /* MSI information */
> DECLARE_BITMAP(msi_irq_in_use, PCI_NUM_MSI);
> };
>
> +struct mobiveil_root_port {
> + char root_bus_nr;
> + void __iomem *config_axi_slave_base; /* endpoint config base */
> + struct resource *ob_io_res;
> + int irq;
> + raw_spinlock_t intx_mask_lock;
> + struct irq_domain *intx_domain;
> + struct mobiveil_msi msi;
> + struct pci_host_bridge *bridge;
> +};
> +
> struct mobiveil_pcie {
> struct platform_device *pdev;
> - void __iomem *config_axi_slave_base; /* endpoint config base */
> void __iomem *csr_axi_slave_base; /* root port config base */
> void __iomem *apb_csr_base; /* MSI register base */
> phys_addr_t 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;
> - struct mobiveil_msi msi;
> + struct mobiveil_root_port rp;
> };
>
> /*
> @@ -281,16 +289,17 @@ static bool mobiveil_pcie_link_up(struct mobiveil_pcie *pcie)
> static bool mobiveil_pcie_valid_device(struct pci_bus *bus, unsigned int devfn)
> {
> struct mobiveil_pcie *pcie = bus->sysdata;
> + struct mobiveil_root_port *rp = &pcie->rp;
>
> /* Only one device down on each root port */
> - if ((bus->number == pcie->root_bus_nr) && (devfn > 0))
> + if ((bus->number == rp->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) && (PCI_SLOT(devfn) > 0))
> + if ((bus->primary == rp->root_bus_nr) && (PCI_SLOT(devfn) > 0))
> return false;
>
> return true;
> @@ -304,13 +313,14 @@ static void __iomem *mobiveil_pcie_map_bus(struct pci_bus *bus,
> unsigned int devfn, int where)
> {
> struct mobiveil_pcie *pcie = bus->sysdata;
> + struct mobiveil_root_port *rp = &pcie->rp;
> u32 value;
>
> if (!mobiveil_pcie_valid_device(bus, devfn))
> return NULL;
>
> /* RC config access */
> - if (bus->number == pcie->root_bus_nr)
> + if (bus->number == rp->root_bus_nr)
> return pcie->csr_axi_slave_base + where;
>
> /*
> @@ -325,7 +335,7 @@ static void __iomem *mobiveil_pcie_map_bus(struct pci_bus *bus,
>
> mobiveil_csr_writel(pcie, value, PAB_AXI_AMAP_PEX_WIN_L(WIN_NUM_0));
>
> - return pcie->config_axi_slave_base + where;
> + return rp->config_axi_slave_base + where;
> }
>
> static struct pci_ops mobiveil_pcie_ops = {
> @@ -339,7 +349,8 @@ 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;
> - struct mobiveil_msi *msi = &pcie->msi;
> + struct mobiveil_root_port *rp = &pcie->rp;
> + struct mobiveil_msi *msi = &rp->msi;
> u32 msi_data, msi_addr_lo, msi_addr_hi;
> u32 intr_status, msi_status;
> unsigned long shifted_status;
> @@ -365,7 +376,7 @@ static void mobiveil_pcie_isr(struct irq_desc *desc)
> shifted_status >>= PAB_INTX_START;
> do {
> for_each_set_bit(bit, &shifted_status, PCI_NUM_INTX) {
> - virq = irq_find_mapping(pcie->intx_domain,
> + virq = irq_find_mapping(rp->intx_domain,
> bit + 1);
> if (virq)
> generic_handle_irq(virq);
> @@ -424,15 +435,16 @@ 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 mobiveil_root_port *rp = &pcie->rp;
> struct resource *res;
>
> /* 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;
> + rp->config_axi_slave_base = devm_pci_remap_cfg_resource(dev, res);
> + if (IS_ERR(rp->config_axi_slave_base))
> + return PTR_ERR(rp->config_axi_slave_base);
> + rp->ob_io_res = res;
>
> /* map csr resource */
> res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> @@ -455,9 +467,9 @@ static int mobiveil_pcie_parse_dt(struct mobiveil_pcie *pcie)
> 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);
> + rp->irq = platform_get_irq(pdev, 0);
> + if (rp->irq <= 0) {
> + dev_err(dev, "failed to map IRQ: %d\n", rp->irq);
> return -ENODEV;
> }
>
> @@ -564,9 +576,9 @@ static int mobiveil_bringup_link(struct mobiveil_pcie *pcie)
> static void mobiveil_pcie_enable_msi(struct mobiveil_pcie *pcie)
> {
> phys_addr_t msg_addr = pcie->pcie_reg_base;
> - struct mobiveil_msi *msi = &pcie->msi;
> + struct mobiveil_msi *msi = &pcie->rp.msi;
>
> - pcie->msi.num_of_vectors = PCI_NUM_MSI;
> + msi->num_of_vectors = PCI_NUM_MSI;
> msi->msi_pages_phys = (phys_addr_t)msg_addr;
>
> writel_relaxed(lower_32_bits(msg_addr),
> @@ -579,7 +591,8 @@ static void mobiveil_pcie_enable_msi(struct mobiveil_pcie *pcie)
>
> static int mobiveil_host_init(struct mobiveil_pcie *pcie)
> {
> - struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
> + struct mobiveil_root_port *rp = &pcie->rp;
> + struct pci_host_bridge *bridge = rp->bridge;
> u32 value, pab_ctrl, type;
> struct resource_entry *win;
>
> @@ -629,8 +642,8 @@ static int mobiveil_host_init(struct mobiveil_pcie *pcie)
> */
>
> /* config outbound translation window */
> - program_ob_windows(pcie, WIN_NUM_0, pcie->ob_io_res->start, 0,
> - CFG_WINDOW_TYPE, resource_size(pcie->ob_io_res));
> + program_ob_windows(pcie, WIN_NUM_0, rp->ob_io_res->start, 0,
> + CFG_WINDOW_TYPE, resource_size(rp->ob_io_res));
>
> /* memory inbound translation window */
> program_ib_windows(pcie, WIN_NUM_0, 0, 0, MEM_WINDOW_TYPE, IB_WIN_SIZE);
> @@ -667,32 +680,36 @@ static void mobiveil_mask_intx_irq(struct irq_data *data)
> {
> struct irq_desc *desc = irq_to_desc(data->irq);
> struct mobiveil_pcie *pcie;
> + struct mobiveil_root_port *rp;
> unsigned long flags;
> u32 mask, shifted_val;
>
> pcie = irq_desc_get_chip_data(desc);
> + rp = &pcie->rp;
> mask = 1 << ((data->hwirq + PAB_INTX_START) - 1);
> - raw_spin_lock_irqsave(&pcie->intx_mask_lock, flags);
> + raw_spin_lock_irqsave(&rp->intx_mask_lock, flags);
> shifted_val = mobiveil_csr_readl(pcie, PAB_INTP_AMBA_MISC_ENB);
> shifted_val &= ~mask;
> mobiveil_csr_writel(pcie, shifted_val, PAB_INTP_AMBA_MISC_ENB);
> - raw_spin_unlock_irqrestore(&pcie->intx_mask_lock, flags);
> + raw_spin_unlock_irqrestore(&rp->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;
> + struct mobiveil_root_port *rp;
> unsigned long flags;
> u32 shifted_val, mask;
>
> pcie = irq_desc_get_chip_data(desc);
> + rp = &pcie->rp;
> mask = 1 << ((data->hwirq + PAB_INTX_START) - 1);
> - raw_spin_lock_irqsave(&pcie->intx_mask_lock, flags);
> + raw_spin_lock_irqsave(&rp->intx_mask_lock, flags);
> shifted_val = mobiveil_csr_readl(pcie, PAB_INTP_AMBA_MISC_ENB);
> shifted_val |= mask;
> mobiveil_csr_writel(pcie, shifted_val, PAB_INTP_AMBA_MISC_ENB);
> - raw_spin_unlock_irqrestore(&pcie->intx_mask_lock, flags);
> + raw_spin_unlock_irqrestore(&rp->intx_mask_lock, flags);
> }
>
> static struct irq_chip intx_irq_chip = {
> @@ -760,7 +777,7 @@ static int mobiveil_irq_msi_domain_alloc(struct irq_domain *domain,
> unsigned int nr_irqs, void *args)
> {
> struct mobiveil_pcie *pcie = domain->host_data;
> - struct mobiveil_msi *msi = &pcie->msi;
> + struct mobiveil_msi *msi = &pcie->rp.msi;
> unsigned long bit;
>
> WARN_ON(nr_irqs != 1);
> @@ -787,7 +804,7 @@ static void mobiveil_irq_msi_domain_free(struct irq_domain *domain,
> {
> struct irq_data *d = irq_domain_get_irq_data(domain, virq);
> struct mobiveil_pcie *pcie = irq_data_get_irq_chip_data(d);
> - struct mobiveil_msi *msi = &pcie->msi;
> + struct mobiveil_msi *msi = &pcie->rp.msi;
>
> mutex_lock(&msi->lock);
>
> @@ -808,9 +825,9 @@ static int mobiveil_allocate_msi_domains(struct mobiveil_pcie *pcie)
> {
> struct device *dev = &pcie->pdev->dev;
> struct fwnode_handle *fwnode = of_node_to_fwnode(dev->of_node);
> - struct mobiveil_msi *msi = &pcie->msi;
> + struct mobiveil_msi *msi = &pcie->rp.msi;
>
> - mutex_init(&pcie->msi.lock);
> + mutex_init(&msi->lock);
> msi->dev_domain = irq_domain_add_linear(NULL, msi->num_of_vectors,
> &msi_domain_ops, pcie);
> if (!msi->dev_domain) {
> @@ -834,18 +851,19 @@ static int mobiveil_pcie_init_irq_domain(struct mobiveil_pcie *pcie)
> {
> struct device *dev = &pcie->pdev->dev;
> struct device_node *node = dev->of_node;
> + struct mobiveil_root_port *rp = &pcie->rp;
> int ret;
>
> /* setup INTx */
> - pcie->intx_domain = irq_domain_add_linear(node, PCI_NUM_INTX,
> - &intx_domain_ops, pcie);
> + rp->intx_domain = irq_domain_add_linear(node, PCI_NUM_INTX,
> + &intx_domain_ops, pcie);
>
> - if (!pcie->intx_domain) {
> + if (!rp->intx_domain) {
> dev_err(dev, "Failed to get a INTx IRQ domain\n");
> return -ENOMEM;
> }
>
> - raw_spin_lock_init(&pcie->intx_mask_lock);
> + raw_spin_lock_init(&rp->intx_mask_lock);
>
> /* setup MSI */
> ret = mobiveil_allocate_msi_domains(pcie);
> @@ -862,6 +880,7 @@ static int mobiveil_pcie_probe(struct platform_device *pdev)
> struct pci_bus *child;
> struct pci_host_bridge *bridge;
> struct device *dev = &pdev->dev;
> + struct mobiveil_root_port *rp;
> int ret;
>
> /* allocate the PCIe port */
> @@ -870,6 +889,8 @@ static int mobiveil_pcie_probe(struct platform_device *pdev)
> return -ENOMEM;
>
> pcie = pci_host_bridge_priv(bridge);
> + rp = &pcie->rp;
> + rp->bridge = bridge;
>
> pcie->pdev = pdev;
>
> @@ -904,12 +925,12 @@ static int mobiveil_pcie_probe(struct platform_device *pdev)
> return ret;
> }
>
> - irq_set_chained_handler_and_data(pcie->irq, mobiveil_pcie_isr, pcie);
> + irq_set_chained_handler_and_data(rp->irq, mobiveil_pcie_isr, pcie);
>
> /* Initialize bridge */
> bridge->dev.parent = dev;
> bridge->sysdata = pcie;
> - bridge->busnr = pcie->root_bus_nr;
> + bridge->busnr = rp->root_bus_nr;
> bridge->ops = &mobiveil_pcie_ops;
> bridge->map_irq = of_irq_parse_and_map_pci;
> bridge->swizzle_irq = pci_common_swizzle;
> --
> 2.17.1
>

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