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drivers/irqchip/irq-versatile-fpga.c
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/* * Support for Versatile FPGA-based IRQ controllers */ |
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#include <linux/bitops.h> |
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#include <linux/irq.h> #include <linux/io.h> |
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#include <linux/irqchip.h> |
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#include <linux/irqchip/versatile-fpga.h> |
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#include <linux/irqdomain.h> #include <linux/module.h> |
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#include <linux/of.h> #include <linux/of_address.h> |
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#include <linux/of_irq.h> |
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#include <asm/exception.h> |
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#include <asm/mach/irq.h> |
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#define IRQ_STATUS 0x00 #define IRQ_RAW_STATUS 0x04 #define IRQ_ENABLE_SET 0x08 #define IRQ_ENABLE_CLEAR 0x0c |
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#define INT_SOFT_SET 0x10 #define INT_SOFT_CLEAR 0x14 #define FIQ_STATUS 0x20 #define FIQ_RAW_STATUS 0x24 #define FIQ_ENABLE 0x28 #define FIQ_ENABLE_SET 0x28 #define FIQ_ENABLE_CLEAR 0x2C |
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#define PIC_ENABLES 0x20 /* set interrupt pass through bits */ |
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/** * struct fpga_irq_data - irq data container for the FPGA IRQ controller * @base: memory offset in virtual memory |
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* @chip: chip container for this instance * @domain: IRQ domain for this instance * @valid: mask for valid IRQs on this controller * @used_irqs: number of active IRQs on this controller */ struct fpga_irq_data { void __iomem *base; |
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struct irq_chip chip; u32 valid; struct irq_domain *domain; u8 used_irqs; }; /* we cannot allocate memory when the controllers are initially registered */ |
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static struct fpga_irq_data fpga_irq_devices[CONFIG_VERSATILE_FPGA_IRQ_NR]; |
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static int fpga_irq_id; |
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static void fpga_irq_mask(struct irq_data *d) { struct fpga_irq_data *f = irq_data_get_irq_chip_data(d); |
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u32 mask = 1 << d->hwirq; |
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writel(mask, f->base + IRQ_ENABLE_CLEAR); } static void fpga_irq_unmask(struct irq_data *d) { struct fpga_irq_data *f = irq_data_get_irq_chip_data(d); |
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u32 mask = 1 << d->hwirq; |
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writel(mask, f->base + IRQ_ENABLE_SET); } |
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static void fpga_irq_handle(struct irq_desc *desc) |
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{ |
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struct fpga_irq_data *f = irq_desc_get_handler_data(desc); |
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u32 status = readl(f->base + IRQ_STATUS); if (status == 0) { |
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do_bad_IRQ(desc); |
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return; } do { |
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unsigned int irq = ffs(status) - 1; |
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status &= ~(1 << irq); |
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generic_handle_irq(irq_find_mapping(f->domain, irq)); |
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} while (status); } |
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/* * Handle each interrupt in a single FPGA IRQ controller. Returns non-zero * if we've handled at least one interrupt. This does a single read of the * status register and handles all interrupts in order from LSB first. */ static int handle_one_fpga(struct fpga_irq_data *f, struct pt_regs *regs) { int handled = 0; int irq; u32 status; while ((status = readl(f->base + IRQ_STATUS))) { irq = ffs(status) - 1; |
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handle_domain_irq(f->domain, irq, regs); |
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handled = 1; } return handled; } /* * Keep iterating over all registered FPGA IRQ controllers until there are * no pending interrupts. */ asmlinkage void __exception_irq_entry fpga_handle_irq(struct pt_regs *regs) |
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{ |
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int i, handled; |
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do { for (i = 0, handled = 0; i < fpga_irq_id; ++i) handled |= handle_one_fpga(&fpga_irq_devices[i], regs); } while (handled); } static int fpga_irqdomain_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hwirq) { struct fpga_irq_data *f = d->host_data; /* Skip invalid IRQs, only register handlers for the real ones */ |
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if (!(f->valid & BIT(hwirq))) |
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return -EPERM; |
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irq_set_chip_data(irq, f); irq_set_chip_and_handler(irq, &f->chip, handle_level_irq); |
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irq_set_probe(irq); |
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return 0; } |
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static const struct irq_domain_ops fpga_irqdomain_ops = { |
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.map = fpga_irqdomain_map, .xlate = irq_domain_xlate_onetwocell, }; |
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void __init fpga_irq_init(void __iomem *base, const char *name, int irq_start, int parent_irq, u32 valid, struct device_node *node) { |
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struct fpga_irq_data *f; |
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int i; |
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if (fpga_irq_id >= ARRAY_SIZE(fpga_irq_devices)) { |
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pr_err("%s: too few FPGA IRQ controllers, increase CONFIG_VERSATILE_FPGA_IRQ_NR ", __func__); |
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return; |
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} |
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f = &fpga_irq_devices[fpga_irq_id]; f->base = base; |
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f->chip.name = name; |
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f->chip.irq_ack = fpga_irq_mask; f->chip.irq_mask = fpga_irq_mask; f->chip.irq_unmask = fpga_irq_unmask; |
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f->valid = valid; |
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if (parent_irq != -1) { |
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irq_set_chained_handler_and_data(parent_irq, fpga_irq_handle, f); |
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} |
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/* This will also allocate irq descriptors */ f->domain = irq_domain_add_simple(node, fls(valid), irq_start, |
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&fpga_irqdomain_ops, f); |
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/* This will allocate all valid descriptors in the linear case */ for (i = 0; i < fls(valid); i++) if (valid & BIT(i)) { if (!irq_start) irq_create_mapping(f->domain, i); f->used_irqs++; } |
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pr_info("FPGA IRQ chip %d \"%s\" @ %p, %u irqs", |
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fpga_irq_id, name, base, f->used_irqs); |
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if (parent_irq != -1) pr_cont(", parent IRQ: %d ", parent_irq); else pr_cont(" "); |
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fpga_irq_id++; |
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} |
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#ifdef CONFIG_OF int __init fpga_irq_of_init(struct device_node *node, struct device_node *parent) { |
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void __iomem *base; u32 clear_mask; u32 valid_mask; |
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int parent_irq; |
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if (WARN_ON(!node)) return -ENODEV; base = of_iomap(node, 0); WARN(!base, "unable to map fpga irq registers "); if (of_property_read_u32(node, "clear-mask", &clear_mask)) clear_mask = 0; if (of_property_read_u32(node, "valid-mask", &valid_mask)) valid_mask = 0; |
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/* Some chips are cascaded from a parent IRQ */ parent_irq = irq_of_parse_and_map(node, 0); |
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if (!parent_irq) { set_handle_irq(fpga_handle_irq); |
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parent_irq = -1; |
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} |
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fpga_irq_init(base, node->name, 0, parent_irq, valid_mask, node); |
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writel(clear_mask, base + IRQ_ENABLE_CLEAR); writel(clear_mask, base + FIQ_ENABLE_CLEAR); |
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/* * On Versatile AB/PB, some secondary interrupts have a direct * pass-thru to the primary controller for IRQs 20 and 22-31 which need * to be enabled. See section 3.10 of the Versatile AB user guide. */ if (of_device_is_compatible(node, "arm,versatile-sic")) writel(0xffd00000, base + PIC_ENABLES); |
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return 0; |
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} |
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IRQCHIP_DECLARE(arm_fpga, "arm,versatile-fpga-irq", fpga_irq_of_init); |
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IRQCHIP_DECLARE(arm_fpga_sic, "arm,versatile-sic", fpga_irq_of_init); |
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IRQCHIP_DECLARE(ox810se_rps, "oxsemi,ox810se-rps-irq", fpga_irq_of_init); |
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#endif |