Re: [PATCH v7 15/19] PCI: microchip: Move IRQ functions to pcie-plda-host.c

From: Conor Dooley
Date: Mon Oct 09 2023 - 10:15:55 EST

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Hey,

On Wed, Sep 27, 2023 at 06:07:58PM +0800, Minda Chen wrote:
> Move IRQ functions to pcie-plda-host.c.
> Including MSI, INTx, event interrupts and IRQ
> init functions.

Same comments about missing motivation for the changes in the commit
message. This just gives a summary of what's being done, without
mentioning the why.

> Signed-off-by: Minda Chen <minda.chen@xxxxxxxxxxxxxxxx>

Otherwise:
Acked-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>

Thanks,
Conor.

> ---
> .../pci/controller/plda/pcie-microchip-host.c | 364 -----------------
> drivers/pci/controller/plda/pcie-plda-host.c | 365 ++++++++++++++++++
> drivers/pci/controller/plda/pcie-plda.h | 3 +
> 3 files changed, 368 insertions(+), 364 deletions(-)
>
> diff --git a/drivers/pci/controller/plda/pcie-microchip-host.c b/drivers/pci/controller/plda/pcie-microchip-host.c
> index 49e09d24eb8f..016915d42f73 100644
> --- a/drivers/pci/controller/plda/pcie-microchip-host.c
> +++ b/drivers/pci/controller/plda/pcie-microchip-host.c
> @@ -317,240 +317,6 @@ static void mc_pcie_enable_msi(struct mc_pcie *port, void __iomem *ecam)
> ecam + MC_MSI_CAP_CTRL_OFFSET + PCI_MSI_ADDRESS_HI);
> }
>
> -static void plda_handle_msi(struct irq_desc *desc)
> -{
> - struct plda_pcie_rp *port = irq_desc_get_handler_data(desc);
> - struct irq_chip *chip = irq_desc_get_chip(desc);
> - struct device *dev = port->dev;
> - struct plda_msi *msi = &port->msi;
> - void __iomem *bridge_base_addr = port->bridge_addr;
> - unsigned long status;
> - u32 bit;
> - int ret;
> -
> - chained_irq_enter(chip, desc);
> -
> - status = readl_relaxed(bridge_base_addr + ISTATUS_LOCAL);
> - if (status & PM_MSI_INT_MSI_MASK) {
> - writel_relaxed(status & PM_MSI_INT_MSI_MASK, bridge_base_addr + ISTATUS_LOCAL);
> - status = readl_relaxed(bridge_base_addr + ISTATUS_MSI);
> - for_each_set_bit(bit, &status, msi->num_vectors) {
> - ret = generic_handle_domain_irq(msi->dev_domain, bit);
> - if (ret)
> - dev_err_ratelimited(dev, "bad MSI IRQ %d\n",
> - bit);
> - }
> - }
> -
> - chained_irq_exit(chip, desc);
> -}
> -
> -static void plda_msi_bottom_irq_ack(struct irq_data *data)
> -{
> - struct plda_pcie_rp *port = irq_data_get_irq_chip_data(data);
> - void __iomem *bridge_base_addr = port->bridge_addr;
> - u32 bitpos = data->hwirq;
> -
> - writel_relaxed(BIT(bitpos), bridge_base_addr + ISTATUS_MSI);
> -}
> -
> -static void plda_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
> -{
> - struct plda_pcie_rp *port = irq_data_get_irq_chip_data(data);
> - phys_addr_t addr = port->msi.vector_phy;
> -
> - msg->address_lo = lower_32_bits(addr);
> - msg->address_hi = upper_32_bits(addr);
> - msg->data = data->hwirq;
> -
> - dev_dbg(port->dev, "msi#%x address_hi %#x address_lo %#x\n",
> - (int)data->hwirq, msg->address_hi, msg->address_lo);
> -}
> -
> -static int plda_msi_set_affinity(struct irq_data *irq_data,
> - const struct cpumask *mask, bool force)
> -{
> - return -EINVAL;
> -}
> -
> -static struct irq_chip plda_msi_bottom_irq_chip = {
> - .name = "PLDA MSI",
> - .irq_ack = plda_msi_bottom_irq_ack,
> - .irq_compose_msi_msg = plda_compose_msi_msg,
> - .irq_set_affinity = plda_msi_set_affinity,
> -};
> -
> -static int plda_irq_msi_domain_alloc(struct irq_domain *domain, unsigned int virq,
> - unsigned int nr_irqs, void *args)
> -{
> - struct plda_pcie_rp *port = domain->host_data;
> - struct plda_msi *msi = &port->msi;
> - unsigned long bit;
> -
> - mutex_lock(&msi->lock);
> - bit = find_first_zero_bit(msi->used, msi->num_vectors);
> - if (bit >= msi->num_vectors) {
> - mutex_unlock(&msi->lock);
> - return -ENOSPC;
> - }
> -
> - set_bit(bit, msi->used);
> -
> - irq_domain_set_info(domain, virq, bit, &plda_msi_bottom_irq_chip,
> - domain->host_data, handle_edge_irq, NULL, NULL);
> -
> - mutex_unlock(&msi->lock);
> -
> - return 0;
> -}
> -
> -static void plda_irq_msi_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 plda_pcie_rp *port = irq_data_get_irq_chip_data(d);
> - struct plda_msi *msi = &port->msi;
> -
> - mutex_lock(&msi->lock);
> -
> - if (test_bit(d->hwirq, msi->used))
> - __clear_bit(d->hwirq, msi->used);
> - else
> - dev_err(port->dev, "trying to free unused MSI%lu\n", d->hwirq);
> -
> - mutex_unlock(&msi->lock);
> -}
> -
> -static const struct irq_domain_ops msi_domain_ops = {
> - .alloc = plda_irq_msi_domain_alloc,
> - .free = plda_irq_msi_domain_free,
> -};
> -
> -static struct irq_chip plda_msi_irq_chip = {
> - .name = "PLDA PCIe MSI",
> - .irq_ack = irq_chip_ack_parent,
> - .irq_mask = pci_msi_mask_irq,
> - .irq_unmask = pci_msi_unmask_irq,
> -};
> -
> -static struct msi_domain_info plda_msi_domain_info = {
> - .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
> - MSI_FLAG_PCI_MSIX),
> - .chip = &plda_msi_irq_chip,
> -};
> -
> -static int plda_allocate_msi_domains(struct plda_pcie_rp *port)
> -{
> - struct device *dev = port->dev;
> - struct fwnode_handle *fwnode = of_node_to_fwnode(dev->of_node);
> - struct plda_msi *msi = &port->msi;
> -
> - mutex_init(&port->msi.lock);
> -
> - msi->dev_domain = irq_domain_add_linear(NULL, msi->num_vectors,
> - &msi_domain_ops, port);
> - if (!msi->dev_domain) {
> - dev_err(dev, "failed to create IRQ domain\n");
> - return -ENOMEM;
> - }
> -
> - msi->msi_domain = pci_msi_create_irq_domain(fwnode, &plda_msi_domain_info,
> - msi->dev_domain);
> - if (!msi->msi_domain) {
> - dev_err(dev, "failed to create MSI domain\n");
> - irq_domain_remove(msi->dev_domain);
> - return -ENOMEM;
> - }
> -
> - return 0;
> -}
> -
> -static void plda_handle_intx(struct irq_desc *desc)
> -{
> - struct plda_pcie_rp *port = irq_desc_get_handler_data(desc);
> - struct irq_chip *chip = irq_desc_get_chip(desc);
> - struct device *dev = port->dev;
> - void __iomem *bridge_base_addr = port->bridge_addr;
> - unsigned long status;
> - u32 bit;
> - int ret;
> -
> - chained_irq_enter(chip, desc);
> -
> - status = readl_relaxed(bridge_base_addr + ISTATUS_LOCAL);
> - if (status & PM_MSI_INT_INTX_MASK) {
> - status &= PM_MSI_INT_INTX_MASK;
> - status >>= PM_MSI_INT_INTX_SHIFT;
> - for_each_set_bit(bit, &status, PCI_NUM_INTX) {
> - ret = generic_handle_domain_irq(port->intx_domain, bit);
> - if (ret)
> - dev_err_ratelimited(dev, "bad INTx IRQ %d\n",
> - bit);
> - }
> - }
> -
> - chained_irq_exit(chip, desc);
> -}
> -
> -static void plda_ack_intx_irq(struct irq_data *data)
> -{
> - struct plda_pcie_rp *port = irq_data_get_irq_chip_data(data);
> - void __iomem *bridge_base_addr = port->bridge_addr;
> - u32 mask = BIT(data->hwirq + PM_MSI_INT_INTX_SHIFT);
> -
> - writel_relaxed(mask, bridge_base_addr + ISTATUS_LOCAL);
> -}
> -
> -static void plda_mask_intx_irq(struct irq_data *data)
> -{
> - struct plda_pcie_rp *port = irq_data_get_irq_chip_data(data);
> - void __iomem *bridge_base_addr = port->bridge_addr;
> - unsigned long flags;
> - u32 mask = BIT(data->hwirq + PM_MSI_INT_INTX_SHIFT);
> - u32 val;
> -
> - raw_spin_lock_irqsave(&port->lock, flags);
> - val = readl_relaxed(bridge_base_addr + IMASK_LOCAL);
> - val &= ~mask;
> - writel_relaxed(val, bridge_base_addr + IMASK_LOCAL);
> - raw_spin_unlock_irqrestore(&port->lock, flags);
> -}
> -
> -static void plda_unmask_intx_irq(struct irq_data *data)
> -{
> - struct plda_pcie_rp *port = irq_data_get_irq_chip_data(data);
> - void __iomem *bridge_base_addr = port->bridge_addr;
> - unsigned long flags;
> - u32 mask = BIT(data->hwirq + PM_MSI_INT_INTX_SHIFT);
> - u32 val;
> -
> - raw_spin_lock_irqsave(&port->lock, flags);
> - val = readl_relaxed(bridge_base_addr + IMASK_LOCAL);
> - val |= mask;
> - writel_relaxed(val, bridge_base_addr + IMASK_LOCAL);
> - raw_spin_unlock_irqrestore(&port->lock, flags);
> -}
> -
> -static struct irq_chip plda_intx_irq_chip = {
> - .name = "PLDA PCIe INTx",
> - .irq_ack = plda_ack_intx_irq,
> - .irq_mask = plda_mask_intx_irq,
> - .irq_unmask = plda_unmask_intx_irq,
> -};
> -
> -static int plda_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
> - irq_hw_number_t hwirq)
> -{
> - irq_set_chip_and_handler(irq, &plda_intx_irq_chip, handle_level_irq);
> - irq_set_chip_data(irq, domain->host_data);
> -
> - return 0;
> -}
> -
> -static const struct irq_domain_ops intx_domain_ops = {
> - .map = plda_pcie_intx_map,
> -};
> -
> static inline u32 reg_to_event(u32 reg, struct event_map field)
> {
> return (reg & field.reg_mask) ? BIT(field.event_bit) : 0;
> @@ -637,23 +403,6 @@ static irqreturn_t mc_event_handler(int irq, void *dev_id)
> return IRQ_HANDLED;
> }
>
> -static void plda_handle_event(struct irq_desc *desc)
> -{
> - struct plda_pcie_rp *port = irq_desc_get_handler_data(desc);
> - unsigned long events;
> - u32 bit;
> - struct irq_chip *chip = irq_desc_get_chip(desc);
> -
> - chained_irq_enter(chip, desc);
> -
> - events = port->event_ops->get_events(port);
> -
> - for_each_set_bit(bit, &events, port->num_events)
> - generic_handle_domain_irq(port->event_domain, bit);
> -
> - chained_irq_exit(chip, desc);
> -}
> -
> static void mc_ack_event_irq(struct irq_data *data)
> {
> struct plda_pcie_rp *port = irq_data_get_irq_chip_data(data);
> @@ -817,47 +566,6 @@ static const struct plda_event mc_event = {
> .msi_event = EVENT_LOCAL_PM_MSI_INT_MSI,
> };
>
> -static int plda_pcie_init_irq_domains(struct plda_pcie_rp *port,
> - const struct irq_domain_ops *ops)
> -{
> - struct device *dev = port->dev;
> - struct device_node *node = dev->of_node;
> - struct device_node *pcie_intc_node;
> -
> - /* Setup INTx */
> - pcie_intc_node = of_get_next_child(node, NULL);
> - if (!pcie_intc_node) {
> - dev_err(dev, "failed to find PCIe Intc node\n");
> - return -EINVAL;
> - }
> -
> - port->event_domain = irq_domain_add_linear(pcie_intc_node, port->num_events,
> - ops, port);
> -
> - if (!port->event_domain) {
> - dev_err(dev, "failed to get event domain\n");
> - of_node_put(pcie_intc_node);
> - return -ENOMEM;
> - }
> -
> - irq_domain_update_bus_token(port->event_domain, DOMAIN_BUS_NEXUS);
> -
> - port->intx_domain = irq_domain_add_linear(pcie_intc_node, PCI_NUM_INTX,
> - &intx_domain_ops, port);
> - if (!port->intx_domain) {
> - dev_err(dev, "failed to get an INTx IRQ domain\n");
> - of_node_put(pcie_intc_node);
> - return -ENOMEM;
> - }
> -
> - irq_domain_update_bus_token(port->intx_domain, DOMAIN_BUS_WIRED);
> -
> - of_node_put(pcie_intc_node);
> - raw_spin_lock_init(&port->lock);
> -
> - return plda_allocate_msi_domains(port);
> -}
> -
> static inline void mc_clear_secs(struct mc_pcie *port)
> {
> void __iomem *ctrl_base_addr = port->axi_base_addr + MC_PCIE_CTRL_ADDR;
> @@ -918,78 +626,6 @@ static void mc_disable_interrupts(struct mc_pcie *port)
> writel_relaxed(GENMASK(31, 0), bridge_base_addr + ISTATUS_HOST);
> }
>
> -static int plda_init_interrupts(struct platform_device *pdev,
> - struct plda_pcie_rp *port,
> - const struct plda_event *event)
> -{
> - struct device *dev = &pdev->dev;
> - int irq;
> - int i, intx_irq, msi_irq, event_irq;
> - int ret;
> - const struct irq_domain_ops *irq_dom_ops;
> -
> - if (!event->event_ops || !event->event_ops->get_events) {
> - dev_err(dev, "no get events ops\n");
> - return -EINVAL;
> - }
> -
> - irq_dom_ops = event->domain_ops ? event->domain_ops : &mc_event_domain_ops;
> -
> - ret = plda_pcie_init_irq_domains(port, irq_dom_ops);
> - if (ret) {
> - dev_err(dev, "failed creating IRQ domains\n");
> - return ret;
> - }
> -
> - irq = platform_get_irq(pdev, 0);
> - if (irq < 0)
> - return -ENODEV;
> -
> - port->event_ops = event->event_ops;
> -
> - for (i = 0; i < port->num_events; i++) {
> - event_irq = irq_create_mapping(port->event_domain, i);
> - if (!event_irq) {
> - dev_err(dev, "failed to map hwirq %d\n", i);
> - return -ENXIO;
> - }
> -
> - if (event->request_event_irq)
> - ret = event->request_event_irq(port, event_irq, i);
> - else
> - ret = devm_request_irq(dev, event_irq, plda_event_handler,
> - 0, NULL, port);
> -
> - if (ret) {
> - dev_err(dev, "failed to request IRQ %d\n", event_irq);
> - return ret;
> - }
> - }
> -
> - intx_irq = irq_create_mapping(port->event_domain,
> - event->intx_event);
> - if (!intx_irq) {
> - dev_err(dev, "failed to map INTx interrupt\n");
> - return -ENXIO;
> - }
> -
> - /* Plug the INTx chained handler */
> - irq_set_chained_handler_and_data(intx_irq, plda_handle_intx, port);
> -
> - msi_irq = irq_create_mapping(port->event_domain,
> - event->msi_event);
> - if (!msi_irq)
> - return -ENXIO;
> -
> - /* Plug the MSI chained handler */
> - irq_set_chained_handler_and_data(msi_irq, plda_handle_msi, port);
> -
> - /* Plug the main event chained handler */
> - irq_set_chained_handler_and_data(irq, plda_handle_event, port);
> -
> - return 0;
> -}
> -
> static int mc_platform_init(struct pci_config_window *cfg)
> {
> struct device *dev = cfg->parent;
> diff --git a/drivers/pci/controller/plda/pcie-plda-host.c b/drivers/pci/controller/plda/pcie-plda-host.c
> index 197eda731c71..c73953bcd1f8 100644
> --- a/drivers/pci/controller/plda/pcie-plda-host.c
> +++ b/drivers/pci/controller/plda/pcie-plda-host.c
> @@ -20,6 +20,240 @@
>
> #include "pcie-plda.h"
>
> +static void plda_handle_msi(struct irq_desc *desc)
> +{
> + struct plda_pcie_rp *port = irq_desc_get_handler_data(desc);
> + struct irq_chip *chip = irq_desc_get_chip(desc);
> + struct device *dev = port->dev;
> + struct plda_msi *msi = &port->msi;
> + void __iomem *bridge_base_addr = port->bridge_addr;
> + unsigned long status;
> + u32 bit;
> + int ret;
> +
> + chained_irq_enter(chip, desc);
> +
> + status = readl_relaxed(bridge_base_addr + ISTATUS_LOCAL);
> + if (status & PM_MSI_INT_MSI_MASK) {
> + writel_relaxed(status & PM_MSI_INT_MSI_MASK, bridge_base_addr + ISTATUS_LOCAL);
> + status = readl_relaxed(bridge_base_addr + ISTATUS_MSI);
> + for_each_set_bit(bit, &status, msi->num_vectors) {
> + ret = generic_handle_domain_irq(msi->dev_domain, bit);
> + if (ret)
> + dev_err_ratelimited(dev, "bad MSI IRQ %d\n",
> + bit);
> + }
> + }
> +
> + chained_irq_exit(chip, desc);
> +}
> +
> +static void plda_msi_bottom_irq_ack(struct irq_data *data)
> +{
> + struct plda_pcie_rp *port = irq_data_get_irq_chip_data(data);
> + void __iomem *bridge_base_addr = port->bridge_addr;
> + u32 bitpos = data->hwirq;
> +
> + writel_relaxed(BIT(bitpos), bridge_base_addr + ISTATUS_MSI);
> +}
> +
> +static void plda_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
> +{
> + struct plda_pcie_rp *port = irq_data_get_irq_chip_data(data);
> + phys_addr_t addr = port->msi.vector_phy;
> +
> + msg->address_lo = lower_32_bits(addr);
> + msg->address_hi = upper_32_bits(addr);
> + msg->data = data->hwirq;
> +
> + dev_dbg(port->dev, "msi#%x address_hi %#x address_lo %#x\n",
> + (int)data->hwirq, msg->address_hi, msg->address_lo);
> +}
> +
> +static int plda_msi_set_affinity(struct irq_data *irq_data,
> + const struct cpumask *mask, bool force)
> +{
> + return -EINVAL;
> +}
> +
> +static struct irq_chip plda_msi_bottom_irq_chip = {
> + .name = "PLDA MSI",
> + .irq_ack = plda_msi_bottom_irq_ack,
> + .irq_compose_msi_msg = plda_compose_msi_msg,
> + .irq_set_affinity = plda_msi_set_affinity,
> +};
> +
> +static int plda_irq_msi_domain_alloc(struct irq_domain *domain, unsigned int virq,
> + unsigned int nr_irqs, void *args)
> +{
> + struct plda_pcie_rp *port = domain->host_data;
> + struct plda_msi *msi = &port->msi;
> + unsigned long bit;
> +
> + mutex_lock(&msi->lock);
> + bit = find_first_zero_bit(msi->used, msi->num_vectors);
> + if (bit >= msi->num_vectors) {
> + mutex_unlock(&msi->lock);
> + return -ENOSPC;
> + }
> +
> + set_bit(bit, msi->used);
> +
> + irq_domain_set_info(domain, virq, bit, &plda_msi_bottom_irq_chip,
> + domain->host_data, handle_edge_irq, NULL, NULL);
> +
> + mutex_unlock(&msi->lock);
> +
> + return 0;
> +}
> +
> +static void plda_irq_msi_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 plda_pcie_rp *port = irq_data_get_irq_chip_data(d);
> + struct plda_msi *msi = &port->msi;
> +
> + mutex_lock(&msi->lock);
> +
> + if (test_bit(d->hwirq, msi->used))
> + __clear_bit(d->hwirq, msi->used);
> + else
> + dev_err(port->dev, "trying to free unused MSI%lu\n", d->hwirq);
> +
> + mutex_unlock(&msi->lock);
> +}
> +
> +static const struct irq_domain_ops msi_domain_ops = {
> + .alloc = plda_irq_msi_domain_alloc,
> + .free = plda_irq_msi_domain_free,
> +};
> +
> +static struct irq_chip plda_msi_irq_chip = {
> + .name = "PLDA PCIe MSI",
> + .irq_ack = irq_chip_ack_parent,
> + .irq_mask = pci_msi_mask_irq,
> + .irq_unmask = pci_msi_unmask_irq,
> +};
> +
> +static struct msi_domain_info plda_msi_domain_info = {
> + .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
> + MSI_FLAG_PCI_MSIX),
> + .chip = &plda_msi_irq_chip,
> +};
> +
> +static int plda_allocate_msi_domains(struct plda_pcie_rp *port)
> +{
> + struct device *dev = port->dev;
> + struct fwnode_handle *fwnode = of_node_to_fwnode(dev->of_node);
> + struct plda_msi *msi = &port->msi;
> +
> + mutex_init(&port->msi.lock);
> +
> + msi->dev_domain = irq_domain_add_linear(NULL, msi->num_vectors,
> + &msi_domain_ops, port);
> + if (!msi->dev_domain) {
> + dev_err(dev, "failed to create IRQ domain\n");
> + return -ENOMEM;
> + }
> +
> + msi->msi_domain = pci_msi_create_irq_domain(fwnode, &plda_msi_domain_info,
> + msi->dev_domain);
> + if (!msi->msi_domain) {
> + dev_err(dev, "failed to create MSI domain\n");
> + irq_domain_remove(msi->dev_domain);
> + return -ENOMEM;
> + }
> +
> + return 0;
> +}
> +
> +static void plda_handle_intx(struct irq_desc *desc)
> +{
> + struct plda_pcie_rp *port = irq_desc_get_handler_data(desc);
> + struct irq_chip *chip = irq_desc_get_chip(desc);
> + struct device *dev = port->dev;
> + void __iomem *bridge_base_addr = port->bridge_addr;
> + unsigned long status;
> + u32 bit;
> + int ret;
> +
> + chained_irq_enter(chip, desc);
> +
> + status = readl_relaxed(bridge_base_addr + ISTATUS_LOCAL);
> + if (status & PM_MSI_INT_INTX_MASK) {
> + status &= PM_MSI_INT_INTX_MASK;
> + status >>= PM_MSI_INT_INTX_SHIFT;
> + for_each_set_bit(bit, &status, PCI_NUM_INTX) {
> + ret = generic_handle_domain_irq(port->intx_domain, bit);
> + if (ret)
> + dev_err_ratelimited(dev, "bad INTx IRQ %d\n",
> + bit);
> + }
> + }
> +
> + chained_irq_exit(chip, desc);
> +}
> +
> +static void plda_ack_intx_irq(struct irq_data *data)
> +{
> + struct plda_pcie_rp *port = irq_data_get_irq_chip_data(data);
> + void __iomem *bridge_base_addr = port->bridge_addr;
> + u32 mask = BIT(data->hwirq + PM_MSI_INT_INTX_SHIFT);
> +
> + writel_relaxed(mask, bridge_base_addr + ISTATUS_LOCAL);
> +}
> +
> +static void plda_mask_intx_irq(struct irq_data *data)
> +{
> + struct plda_pcie_rp *port = irq_data_get_irq_chip_data(data);
> + void __iomem *bridge_base_addr = port->bridge_addr;
> + unsigned long flags;
> + u32 mask = BIT(data->hwirq + PM_MSI_INT_INTX_SHIFT);
> + u32 val;
> +
> + raw_spin_lock_irqsave(&port->lock, flags);
> + val = readl_relaxed(bridge_base_addr + IMASK_LOCAL);
> + val &= ~mask;
> + writel_relaxed(val, bridge_base_addr + IMASK_LOCAL);
> + raw_spin_unlock_irqrestore(&port->lock, flags);
> +}
> +
> +static void plda_unmask_intx_irq(struct irq_data *data)
> +{
> + struct plda_pcie_rp *port = irq_data_get_irq_chip_data(data);
> + void __iomem *bridge_base_addr = port->bridge_addr;
> + unsigned long flags;
> + u32 mask = BIT(data->hwirq + PM_MSI_INT_INTX_SHIFT);
> + u32 val;
> +
> + raw_spin_lock_irqsave(&port->lock, flags);
> + val = readl_relaxed(bridge_base_addr + IMASK_LOCAL);
> + val |= mask;
> + writel_relaxed(val, bridge_base_addr + IMASK_LOCAL);
> + raw_spin_unlock_irqrestore(&port->lock, flags);
> +}
> +
> +static struct irq_chip plda_intx_irq_chip = {
> + .name = "PLDA PCIe INTx",
> + .irq_ack = plda_ack_intx_irq,
> + .irq_mask = plda_mask_intx_irq,
> + .irq_unmask = plda_unmask_intx_irq,
> +};
> +
> +static int plda_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
> + irq_hw_number_t hwirq)
> +{
> + irq_set_chip_and_handler(irq, &plda_intx_irq_chip, handle_level_irq);
> + irq_set_chip_data(irq, domain->host_data);
> +
> + return 0;
> +}
> +
> +static const struct irq_domain_ops intx_domain_ops = {
> + .map = plda_pcie_intx_map,
> +};
> +
> irqreturn_t plda_event_handler(int irq, void *dev_id)
> {
> return IRQ_HANDLED;
> @@ -45,6 +279,23 @@ static u32 plda_get_events(struct plda_pcie_rp *port)
> return events;
> }
>
> +static void plda_handle_event(struct irq_desc *desc)
> +{
> + struct plda_pcie_rp *port = irq_desc_get_handler_data(desc);
> + struct irq_chip *chip = irq_desc_get_chip(desc);
> + u32 bit;
> + unsigned long events;
> +
> + chained_irq_enter(chip, desc);
> +
> + events = port->event_ops->get_events(port);
> +
> + for_each_set_bit(bit, &events, port->num_events)
> + generic_handle_domain_irq(port->event_domain, bit);
> +
> + chained_irq_exit(chip, desc);
> +}
> +
> static u32 plda_hwirq_to_mask(int hwirq)
> {
> u32 mask;
> @@ -119,6 +370,120 @@ struct plda_event_ops plda_event_ops = {
> .get_events = plda_get_events,
> };
>
> +static int plda_pcie_init_irq_domains(struct plda_pcie_rp *port,
> + const struct irq_domain_ops *ops)
> +{
> + struct device *dev = port->dev;
> + struct device_node *node = dev->of_node;
> + struct device_node *pcie_intc_node;
> +
> + /* Setup INTx */
> + pcie_intc_node = of_get_next_child(node, NULL);
> + if (!pcie_intc_node) {
> + dev_err(dev, "failed to find PCIe Intc node\n");
> + return -EINVAL;
> + }
> +
> + port->event_domain = irq_domain_add_linear(pcie_intc_node, port->num_events,
> + ops, port);
> +
> + if (!port->event_domain) {
> + dev_err(dev, "failed to get event domain\n");
> + of_node_put(pcie_intc_node);
> + return -ENOMEM;
> + }
> +
> + irq_domain_update_bus_token(port->event_domain, DOMAIN_BUS_NEXUS);
> +
> + port->intx_domain = irq_domain_add_linear(pcie_intc_node, PCI_NUM_INTX,
> + &intx_domain_ops, port);
> + if (!port->intx_domain) {
> + dev_err(dev, "failed to get an INTx IRQ domain\n");
> + of_node_put(pcie_intc_node);
> + return -ENOMEM;
> + }
> +
> + irq_domain_update_bus_token(port->intx_domain, DOMAIN_BUS_WIRED);
> +
> + of_node_put(pcie_intc_node);
> + raw_spin_lock_init(&port->lock);
> +
> + return plda_allocate_msi_domains(port);
> +}
> +
> +int plda_init_interrupts(struct platform_device *pdev,
> + struct plda_pcie_rp *port,
> + const struct plda_event *event)
> +{
> + struct device *dev = &pdev->dev;
> + int irq;
> + int i, intx_irq, msi_irq, event_irq;
> + int ret;
> + const struct irq_domain_ops *irq_dom_ops;
> +
> + if (!event->event_ops || !event->event_ops->get_events) {
> + dev_err(dev, "no get events ops\n");
> + return -EINVAL;
> + }
> +
> + irq_dom_ops = event->domain_ops ? event->domain_ops : &plda_evt_dom_ops;
> +
> + ret = plda_pcie_init_irq_domains(port, irq_dom_ops);
> + if (ret) {
> + dev_err(dev, "failed creating IRQ domains\n");
> + return ret;
> + }
> +
> + irq = platform_get_irq(pdev, 0);
> + if (irq < 0)
> + return -ENODEV;
> +
> + port->event_ops = event->event_ops;
> +
> + for (i = 0; i < port->num_events; i++) {
> + event_irq = irq_create_mapping(port->event_domain, i);
> + if (!event_irq) {
> + dev_err(dev, "failed to map hwirq %d\n", i);
> + return -ENXIO;
> + }
> +
> + if (event->request_event_irq)
> + ret = event->request_event_irq(port, event_irq, i);
> + else
> + ret = devm_request_irq(dev, event_irq, plda_event_handler,
> + 0, NULL, port);
> +
> + if (ret) {
> + dev_err(dev, "failed to request IRQ %d\n", event_irq);
> + return ret;
> + }
> + }
> +
> + intx_irq = irq_create_mapping(port->event_domain,
> + event->intx_event);
> + if (!intx_irq) {
> + dev_err(dev, "failed to map INTx interrupt\n");
> + return -ENXIO;
> + }
> +
> + /* Plug the INTx chained handler */
> + irq_set_chained_handler_and_data(intx_irq, plda_handle_intx, port);
> +
> + msi_irq = irq_create_mapping(port->event_domain,
> + event->msi_event);
> + if (!msi_irq)
> + return -ENXIO;
> +
> + /* Plug the MSI chained handler */
> + irq_set_chained_handler_and_data(msi_irq, plda_handle_msi, port);
> +
> + /* Plug the main event chained handler */
> + irq_set_chained_handler_and_data(irq, plda_handle_event, port);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(plda_init_interrupts);
> +
> void plda_pcie_setup_window(void __iomem *bridge_base_addr, u32 index,
> phys_addr_t axi_addr, phys_addr_t pci_addr,
> size_t size)
> diff --git a/drivers/pci/controller/plda/pcie-plda.h b/drivers/pci/controller/plda/pcie-plda.h
> index 122084a3318a..e59369f23329 100644
> --- a/drivers/pci/controller/plda/pcie-plda.h
> +++ b/drivers/pci/controller/plda/pcie-plda.h
> @@ -164,6 +164,9 @@ struct plda_event {
> };
>
> irqreturn_t plda_event_handler(int irq, void *dev_id);
> +int plda_init_interrupts(struct platform_device *pdev,
> + struct plda_pcie_rp *port,
> + const struct plda_event *event);
> void plda_pcie_setup_window(void __iomem *bridge_base_addr, u32 index,
> phys_addr_t axi_addr, phys_addr_t pci_addr,
> size_t size);
> --
> 2.17.1
>

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