/* * Copyright (C) 2007-2013 Michal Simek * Copyright (C) 2012-2013 Xilinx, Inc. * Copyright (C) 2007-2009 PetaLogix * Copyright (C) 2006 Atmark Techno, Inc. * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. */ #include #include #include #include #include #include #include #include #include /* No one else should require these constants, so define them locally here. */ #define ISR 0x00 /* Interrupt Status Register */ #define IPR 0x04 /* Interrupt Pending Register */ #define IER 0x08 /* Interrupt Enable Register */ #define IAR 0x0c /* Interrupt Acknowledge Register */ #define SIE 0x10 /* Set Interrupt Enable bits */ #define CIE 0x14 /* Clear Interrupt Enable bits */ #define IVR 0x18 /* Interrupt Vector Register */ #define MER 0x1c /* Master Enable Register */ #define MER_ME (1<<0) #define MER_HIE (1<<1) static DEFINE_STATIC_KEY_FALSE(xintc_is_be); struct xintc_irq_chip { void __iomem *base; struct irq_domain *root_domain; u32 intr_mask; u32 nr_irq; }; static struct xintc_irq_chip *primary_intc; static void xintc_write(struct xintc_irq_chip *irqc, int reg, u32 data) { if (static_branch_unlikely(&xintc_is_be)) iowrite32be(data, irqc->base + reg); else iowrite32(data, irqc->base + reg); } static u32 xintc_read(struct xintc_irq_chip *irqc, int reg) { if (static_branch_unlikely(&xintc_is_be)) return ioread32be(irqc->base + reg); else return ioread32(irqc->base + reg); } static void intc_enable_or_unmask(struct irq_data *d) { struct xintc_irq_chip *irqc = irq_data_get_irq_chip_data(d); unsigned long mask = BIT(d->hwirq); pr_debug("irq-xilinx: enable_or_unmask: %ld\n", d->hwirq); /* ack level irqs because they can't be acked during * ack function since the handle_level_irq function * acks the irq before calling the interrupt handler */ if (irqd_is_level_type(d)) xintc_write(irqc, IAR, mask); xintc_write(irqc, SIE, mask); } static void intc_disable_or_mask(struct irq_data *d) { struct xintc_irq_chip *irqc = irq_data_get_irq_chip_data(d); pr_debug("irq-xilinx: disable: %ld\n", d->hwirq); xintc_write(irqc, CIE, BIT(d->hwirq)); } static void intc_ack(struct irq_data *d) { struct xintc_irq_chip *irqc = irq_data_get_irq_chip_data(d); pr_debug("irq-xilinx: ack: %ld\n", d->hwirq); xintc_write(irqc, IAR, BIT(d->hwirq)); } static void intc_mask_ack(struct irq_data *d) { struct xintc_irq_chip *irqc = irq_data_get_irq_chip_data(d); unsigned long mask = BIT(d->hwirq); pr_debug("irq-xilinx: disable_and_ack: %ld\n", d->hwirq); xintc_write(irqc, CIE, mask); xintc_write(irqc, IAR, mask); } static struct irq_chip intc_dev = { .name = "Xilinx INTC", .irq_unmask = intc_enable_or_unmask, .irq_mask = intc_disable_or_mask, .irq_ack = intc_ack, .irq_mask_ack = intc_mask_ack, }; static unsigned int xintc_get_irq_local(struct xintc_irq_chip *irqc) { unsigned int irq = 0; u32 hwirq; hwirq = xintc_read(irqc, IVR); if (hwirq != -1U) irq = irq_find_mapping(irqc->root_domain, hwirq); pr_debug("irq-xilinx: hwirq=%d, irq=%d\n", hwirq, irq); return irq; } unsigned int xintc_get_irq(void) { unsigned int irq = -1; u32 hwirq; hwirq = xintc_read(primary_intc, IVR); if (hwirq != -1U) irq = irq_find_mapping(primary_intc->root_domain, hwirq); pr_debug("irq-xilinx: hwirq=%d, irq=%d\n", hwirq, irq); return irq; } static int xintc_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw) { struct xintc_irq_chip *irqc = d->host_data; if (irqc->intr_mask & BIT(hw)) { irq_set_chip_and_handler_name(irq, &intc_dev, handle_edge_irq, "edge"); irq_clear_status_flags(irq, IRQ_LEVEL); } else { irq_set_chip_and_handler_name(irq, &intc_dev, handle_level_irq, "level"); irq_set_status_flags(irq, IRQ_LEVEL); } irq_set_chip_data(irq, irqc); return 0; } static const struct irq_domain_ops xintc_irq_domain_ops = { .xlate = irq_domain_xlate_onetwocell, .map = xintc_map, }; static void xil_intc_irq_handler(struct irq_desc *desc) { struct irq_chip *chip = irq_desc_get_chip(desc); struct xintc_irq_chip *irqc; u32 pending; irqc = irq_data_get_irq_handler_data(&desc->irq_data); chained_irq_enter(chip, desc); do { pending = xintc_get_irq_local(irqc); if (pending == 0) break; generic_handle_irq(pending); } while (true); chained_irq_exit(chip, desc); } static int __init xilinx_intc_of_init(struct device_node *intc, struct device_node *parent) { struct xintc_irq_chip *irqc; int ret, irq; irqc = kzalloc(sizeof(*irqc), GFP_KERNEL); if (!irqc) return -ENOMEM; irqc->base = of_iomap(intc, 0); BUG_ON(!irqc->base); ret = of_property_read_u32(intc, "xlnx,num-intr-inputs", &irqc->nr_irq); if (ret < 0) { pr_err("irq-xilinx: unable to read xlnx,num-intr-inputs\n"); goto error; } ret = of_property_read_u32(intc, "xlnx,kind-of-intr", &irqc->intr_mask); if (ret < 0) { pr_warn("irq-xilinx: unable to read xlnx,kind-of-intr\n"); irqc->intr_mask = 0; } if (irqc->intr_mask >> irqc->nr_irq) pr_warn("irq-xilinx: mismatch in kind-of-intr param\n"); pr_info("irq-xilinx: %pOF: num_irq=%d, edge=0x%x\n", intc, irqc->nr_irq, irqc->intr_mask); /* * Disable all external interrupts until they are * explicity requested. */ xintc_write(irqc, IER, 0); /* Acknowledge any pending interrupts just in case. */ xintc_write(irqc, IAR, 0xffffffff); /* Turn on the Master Enable. */ xintc_write(irqc, MER, MER_HIE | MER_ME); if (xintc_read(irqc, MER) != (MER_HIE | MER_ME)) { static_branch_enable(&xintc_is_be); xintc_write(irqc, MER, MER_HIE | MER_ME); } irqc->root_domain = irq_domain_add_linear(intc, irqc->nr_irq, &xintc_irq_domain_ops, irqc); if (!irqc->root_domain) { pr_err("irq-xilinx: Unable to create IRQ domain\n"); goto error; } if (parent) { irq = irq_of_parse_and_map(intc, 0); if (irq) { irq_set_chained_handler_and_data(irq, xil_intc_irq_handler, irqc); } else { pr_err("irq-xilinx: interrupts property not in DT\n"); ret = -EINVAL; goto error; } } else { primary_intc = irqc; irq_set_default_host(primary_intc->root_domain); } return 0; error: iounmap(irqc->base); kfree(irqc); return ret; } IRQCHIP_DECLARE(xilinx_intc_xps, "xlnx,xps-intc-1.00.a", xilinx_intc_of_init); IRQCHIP_DECLARE(xilinx_intc_opb, "xlnx,opb-intc-1.00.c", xilinx_intc_of_init);