K2G provides separate IRQ lines for each of the four legacy interrupts. Model this using hierarchy domain instead of linear domain with chained IRQ handler.
Signed-off-by: Kishon Vijay Abraham I <[email protected]> --- drivers/pci/controller/dwc/pci-keystone.c | 205 +++++++++++++--------- 1 file changed, 118 insertions(+), 87 deletions(-) diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c index 47f0dcf638f2..7f1648453f54 100644 --- a/drivers/pci/controller/dwc/pci-keystone.c +++ b/drivers/pci/controller/dwc/pci-keystone.c @@ -61,6 +61,7 @@ #define IRQ_STATUS(n) (0x184 + ((n) << 4)) #define IRQ_ENABLE_SET(n) (0x188 + ((n) << 4)) +#define IRQ_ENABLE_CLR(n) (0x18C + ((n) << 4)) #define INTx_EN BIT(0) #define ERR_IRQ_STATUS 0x1c4 @@ -87,7 +88,6 @@ struct keystone_pcie { struct dw_pcie *pci; /* PCI Device ID */ u32 device_id; - int legacy_host_irqs[PCI_NUM_INTX]; struct device_node *legacy_intc_np; int msi_host_irqs[MAX_MSI_HOST_IRQS]; @@ -96,7 +96,6 @@ struct keystone_pcie { struct phy **phy; struct device_link **link; struct device_node *msi_intc_np; - struct irq_domain *legacy_irq_domain; struct device_node *np; int error_irq; @@ -199,26 +198,6 @@ static int ks_pcie_msi_host_init(struct pcie_port *pp) return dw_pcie_allocate_domains(pp); } -static void ks_pcie_handle_legacy_irq(struct keystone_pcie *ks_pcie, - int offset) -{ - struct dw_pcie *pci = ks_pcie->pci; - struct device *dev = pci->dev; - u32 pending; - int virq; - - pending = ks_pcie_app_readl(ks_pcie, IRQ_STATUS(offset)); - - if (BIT(0) & pending) { - virq = irq_linear_revmap(ks_pcie->legacy_irq_domain, offset); - dev_dbg(dev, ": irq: irq_offset %d, virq %d\n", offset, virq); - generic_handle_irq(virq); - } - - /* EOI the INTx interrupt */ - ks_pcie_app_writel(ks_pcie, IRQ_EOI, offset); -} - static void ks_pcie_enable_error_irq(struct keystone_pcie *ks_pcie) { ks_pcie_app_writel(ks_pcie, ERR_IRQ_ENABLE_SET, ERR_IRQ_ALL); @@ -256,39 +235,117 @@ static irqreturn_t ks_pcie_handle_error_irq(struct keystone_pcie *ks_pcie) return IRQ_HANDLED; } -static void ks_pcie_ack_legacy_irq(struct irq_data *d) +void ks_pcie_irq_eoi(struct irq_data *data) { + struct keystone_pcie *ks_pcie = irq_data_get_irq_chip_data(data); + irq_hw_number_t hwirq = data->hwirq; + + ks_pcie_app_writel(ks_pcie, IRQ_EOI, hwirq); + irq_chip_eoi_parent(data); } -static void ks_pcie_mask_legacy_irq(struct irq_data *d) +void ks_pcie_irq_enable(struct irq_data *data) { + struct keystone_pcie *ks_pcie = irq_data_get_irq_chip_data(data); + irq_hw_number_t hwirq = data->hwirq; + + ks_pcie_app_writel(ks_pcie, IRQ_ENABLE_SET(hwirq), INTx_EN); + irq_chip_enable_parent(data); } -static void ks_pcie_unmask_legacy_irq(struct irq_data *d) +void ks_pcie_irq_disable(struct irq_data *data) { + struct keystone_pcie *ks_pcie = irq_data_get_irq_chip_data(data); + irq_hw_number_t hwirq = data->hwirq; + + ks_pcie_app_writel(ks_pcie, IRQ_ENABLE_CLR(hwirq), INTx_EN); + irq_chip_disable_parent(data); } static struct irq_chip ks_pcie_legacy_irq_chip = { - .name = "Keystone-PCI-Legacy-IRQ", - .irq_ack = ks_pcie_ack_legacy_irq, - .irq_mask = ks_pcie_mask_legacy_irq, - .irq_unmask = ks_pcie_unmask_legacy_irq, + .name = "Keystone-PCI-Legacy-IRQ", + .irq_enable = ks_pcie_irq_enable, + .irq_disable = ks_pcie_irq_disable, + .irq_eoi = ks_pcie_irq_eoi, + .irq_mask = irq_chip_mask_parent, + .irq_unmask = irq_chip_unmask_parent, + .irq_retrigger = irq_chip_retrigger_hierarchy, + .irq_set_type = irq_chip_set_type_parent, + .irq_set_affinity = irq_chip_set_affinity_parent, }; -static int ks_pcie_init_legacy_irq_map(struct irq_domain *d, - unsigned int irq, - irq_hw_number_t hw_irq) +static int ks_pcie_legacy_irq_domain_alloc(struct irq_domain *domain, + unsigned int virq, + unsigned int nr_irqs, void *data) { - irq_set_chip_and_handler(irq, &ks_pcie_legacy_irq_chip, - handle_level_irq); - irq_set_chip_data(irq, d->host_data); + struct keystone_pcie *ks_pcie = domain->host_data; + struct device_node *np = ks_pcie->legacy_intc_np; + struct irq_fwspec parent_fwspec, *fwspec = data; + struct of_phandle_args out_irq; + int ret, i; + + if (nr_irqs != 1) + return -EINVAL; + + ret = of_irq_parse_one(np, fwspec->param[0], &out_irq); + if (ret < 0) { + pr_err("Failed to parse interrupt node\n"); + return ret; + } + + parent_fwspec.fwnode = &out_irq.np->fwnode; + parent_fwspec.param_count = out_irq.args_count; + + for (i = 0; i < out_irq.args_count; i++) + parent_fwspec.param[i] = out_irq.args[i]; + + ret = irq_domain_alloc_irqs_parent(domain, virq, 1, &parent_fwspec); + if (ret < 0) { + pr_err("Failed to allocate parent irq %u: %d\n", + parent_fwspec.param[0], ret); + return ret; + } + + ret = irq_domain_set_hwirq_and_chip(domain, virq, fwspec->param[0], + &ks_pcie_legacy_irq_chip, ks_pcie); + if (ret < 0) { + pr_err("Failed to set hwirq and chip\n"); + goto err_set_hwirq_and_chip; + } return 0; + +err_set_hwirq_and_chip: + irq_domain_free_irqs_parent(domain, virq, 1); + + return ret; +} + +static int ks_pcie_irq_domain_translate(struct irq_domain *domain, + struct irq_fwspec *fwspec, + unsigned long *hwirq, + unsigned int *type) +{ + if (is_of_node(fwspec->fwnode)) { + if (fwspec->param_count != 2) + return -EINVAL; + + if (fwspec->param[0] >= PCI_NUM_INTX) + return -EINVAL; + + *hwirq = fwspec->param[0]; + *type = fwspec->param[1]; + + return 0; + } + + return -EINVAL; } static const struct irq_domain_ops ks_pcie_legacy_irq_domain_ops = { - .map = ks_pcie_init_legacy_irq_map, - .xlate = irq_domain_xlate_onetwocell, + .alloc = ks_pcie_legacy_irq_domain_alloc, + .free = irq_domain_free_irqs_common, + .translate = ks_pcie_irq_domain_translate, }; /** @@ -572,35 +629,6 @@ static void ks_pcie_msi_irq_handler(struct irq_desc *desc) chained_irq_exit(chip, desc); } -/** - * ks_pcie_legacy_irq_handler() - Handle legacy interrupt - * @irq: IRQ line for legacy interrupts - * @desc: Pointer to irq descriptor - * - * Traverse through pending legacy interrupts and invoke handler for each. Also - * takes care of interrupt controller level mask/ack operation. - */ -static void ks_pcie_legacy_irq_handler(struct irq_desc *desc) -{ - unsigned int irq = irq_desc_get_irq(desc); - struct keystone_pcie *ks_pcie = irq_desc_get_handler_data(desc); - struct dw_pcie *pci = ks_pcie->pci; - struct device *dev = pci->dev; - u32 irq_offset = irq - ks_pcie->legacy_host_irqs[0]; - struct irq_chip *chip = irq_desc_get_chip(desc); - - dev_dbg(dev, ": Handling legacy irq %d\n", irq); - - /* - * The chained irq handler installation would have replaced normal - * interrupt driver handler so we need to take care of mask/unmask and - * ack operation. - */ - chained_irq_enter(chip, desc); - ks_pcie_handle_legacy_irq(ks_pcie, irq_offset); - chained_irq_exit(chip, desc); -} - static int ks_pcie_config_msi_irq(struct keystone_pcie *ks_pcie) { struct device *dev = ks_pcie->pci->dev; @@ -655,14 +683,33 @@ static int ks_pcie_config_legacy_irq(struct keystone_pcie *ks_pcie) struct device *dev = ks_pcie->pci->dev; struct irq_domain *legacy_irq_domain; struct device_node *np = ks_pcie->np; + struct irq_domain *parent_domain; + struct device_node *parent_node; struct device_node *intc_np; - int irq_count, irq, ret = 0, i; + int irq_count, ret = 0; intc_np = of_get_child_by_name(np, "legacy-interrupt-controller"); if (!intc_np) { dev_warn(dev, "legacy-interrupt-controller node is absent\n"); return -EINVAL; } + ks_pcie->legacy_intc_np = intc_np; + + parent_node = of_irq_find_parent(intc_np); + if (!parent_node) { + dev_err(dev, "unable to obtain parent node\n"); + ret = -ENXIO; + goto err; + } + + parent_domain = irq_find_host(parent_node); + if (!parent_domain) { + dev_err(dev, "unable to obtain parent domain\n"); + ret = -ENXIO; + goto err; + } + + of_node_put(parent_node); irq_count = of_irq_count(intc_np); if (!irq_count) { @@ -671,31 +718,15 @@ static int ks_pcie_config_legacy_irq(struct keystone_pcie *ks_pcie) goto err; } - for (i = 0; i < irq_count; i++) { - irq = irq_of_parse_and_map(intc_np, i); - if (!irq) { - ret = -EINVAL; - goto err; - } - ks_pcie->legacy_host_irqs[i] = irq; - - irq_set_chained_handler_and_data(irq, - ks_pcie_legacy_irq_handler, - ks_pcie); - } - legacy_irq_domain = - irq_domain_add_linear(intc_np, PCI_NUM_INTX, - &ks_pcie_legacy_irq_domain_ops, NULL); + irq_domain_add_hierarchy(parent_domain, 0, PCI_NUM_INTX, + intc_np, + &ks_pcie_legacy_irq_domain_ops, + ks_pcie); if (!legacy_irq_domain) { dev_err(dev, "Failed to add irq domain for legacy irqs\n"); ret = -EINVAL; - goto err; } - ks_pcie->legacy_irq_domain = legacy_irq_domain; - - for (i = 0; i < PCI_NUM_INTX; i++) - ks_pcie_app_writel(ks_pcie, IRQ_ENABLE_SET(i), INTx_EN); err: of_node_put(intc_np); -- 2.17.1
