diff options
Diffstat (limited to 'arch/arm/plat-versatile/fpga-irq.c')
| -rw-r--r-- | arch/arm/plat-versatile/fpga-irq.c | 210 |
1 files changed, 0 insertions, 210 deletions
diff --git a/arch/arm/plat-versatile/fpga-irq.c b/arch/arm/plat-versatile/fpga-irq.c deleted file mode 100644 index 091ae103004..00000000000 --- a/arch/arm/plat-versatile/fpga-irq.c +++ /dev/null @@ -1,210 +0,0 @@ -/* - * Support for Versatile FPGA-based IRQ controllers - */ -#include <linux/irq.h> -#include <linux/io.h> -#include <linux/irqdomain.h> -#include <linux/module.h> -#include <linux/of.h> -#include <linux/of_address.h> - -#include <asm/exception.h> -#include <asm/mach/irq.h> -#include <plat/fpga-irq.h> - -#define IRQ_STATUS 0x00 -#define IRQ_RAW_STATUS 0x04 -#define IRQ_ENABLE_SET 0x08 -#define IRQ_ENABLE_CLEAR 0x0c -#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 - -/** - * struct fpga_irq_data - irq data container for the FPGA IRQ controller - * @base: memory offset in virtual memory - * @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; - struct irq_chip chip; - u32 valid; - struct irq_domain *domain; - u8 used_irqs; -}; - -/* we cannot allocate memory when the controllers are initially registered */ -static struct fpga_irq_data fpga_irq_devices[CONFIG_PLAT_VERSATILE_FPGA_IRQ_NR]; -static int fpga_irq_id; - -static void fpga_irq_mask(struct irq_data *d) -{ - struct fpga_irq_data *f = irq_data_get_irq_chip_data(d); - u32 mask = 1 << d->hwirq; - - 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); - u32 mask = 1 << d->hwirq; - - writel(mask, f->base + IRQ_ENABLE_SET); -} - -static void fpga_irq_handle(unsigned int irq, struct irq_desc *desc) -{ - struct fpga_irq_data *f = irq_desc_get_handler_data(desc); - u32 status = readl(f->base + IRQ_STATUS); - - if (status == 0) { - do_bad_IRQ(irq, desc); - return; - } - - do { - irq = ffs(status) - 1; - status &= ~(1 << irq); - generic_handle_irq(irq_find_mapping(f->domain, irq)); - } while (status); -} - -/* - * 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; - handle_IRQ(irq_find_mapping(f->domain, irq), regs); - 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) -{ - int i, handled; - - 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 */ - if (!(f->valid & (1 << hwirq))) - return -ENOTSUPP; - irq_set_chip_data(irq, f); - irq_set_chip_and_handler(irq, &f->chip, - handle_level_irq); - set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); - f->used_irqs++; - return 0; -} - -static struct irq_domain_ops fpga_irqdomain_ops = { - .map = fpga_irqdomain_map, - .xlate = irq_domain_xlate_onetwocell, -}; - -static __init struct fpga_irq_data * -fpga_irq_prep_struct(void __iomem *base, const char *name, u32 valid) { - struct fpga_irq_data *f; - - if (fpga_irq_id >= ARRAY_SIZE(fpga_irq_devices)) { - printk(KERN_ERR "%s: too few FPGA IRQ controllers, increase CONFIG_PLAT_VERSATILE_FPGA_IRQ_NR\n", __func__); - return NULL; - } - f = &fpga_irq_devices[fpga_irq_id]; - f->base = base; - f->chip.name = name; - f->chip.irq_ack = fpga_irq_mask; - f->chip.irq_mask = fpga_irq_mask; - f->chip.irq_unmask = fpga_irq_unmask; - f->valid = valid; - fpga_irq_id++; - - return f; -} - -void __init fpga_irq_init(void __iomem *base, const char *name, int irq_start, - int parent_irq, u32 valid, struct device_node *node) -{ - struct fpga_irq_data *f; - - f = fpga_irq_prep_struct(base, name, valid); - if (!f) - return; - - if (parent_irq != -1) { - irq_set_handler_data(parent_irq, f); - irq_set_chained_handler(parent_irq, fpga_irq_handle); - } - - f->domain = irq_domain_add_legacy(node, fls(valid), irq_start, 0, - &fpga_irqdomain_ops, f); - pr_info("FPGA IRQ chip %d \"%s\" @ %p, %u irqs\n", - fpga_irq_id, name, base, f->used_irqs); -} - -#ifdef CONFIG_OF -int __init fpga_irq_of_init(struct device_node *node, - struct device_node *parent) -{ - struct fpga_irq_data *f; - void __iomem *base; - u32 clear_mask; - u32 valid_mask; - - if (WARN_ON(!node)) - return -ENODEV; - - base = of_iomap(node, 0); - WARN(!base, "unable to map fpga irq registers\n"); - - 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; - - f = fpga_irq_prep_struct(base, node->name, valid_mask); - if (!f) - return -ENOMEM; - - writel(clear_mask, base + IRQ_ENABLE_CLEAR); - writel(clear_mask, base + FIQ_ENABLE_CLEAR); - - f->domain = irq_domain_add_linear(node, fls(valid_mask), &fpga_irqdomain_ops, f); - f->used_irqs = hweight32(valid_mask); - - pr_info("FPGA IRQ chip %d \"%s\" @ %p, %u irqs\n", - fpga_irq_id, node->name, base, f->used_irqs); - return 0; -} -#endif |