| /* |
| * Hitachi UL SolutionEngine 7722 FPGA IRQ Support. |
| * |
| * Copyright (C) 2007 Nobuhiro Iwamatsu |
| * Copyright (C) 2012 Paul Mundt |
| * |
| * 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. |
| */ |
| #define DRV_NAME "SE7722-FPGA" |
| #define pr_fmt(fmt) DRV_NAME ": " fmt |
| |
| #include <linux/init.h> |
| #include <linux/irq.h> |
| #include <linux/interrupt.h> |
| #include <linux/irqdomain.h> |
| #include <linux/io.h> |
| #include <linux/err.h> |
| #include <asm/sizes.h> |
| #include <mach-se/mach/se7722.h> |
| |
| #define IRQ01_BASE_ADDR 0x11800000 |
| #define IRQ01_MODE_REG 0 |
| #define IRQ01_STS_REG 4 |
| #define IRQ01_MASK_REG 8 |
| |
| static void __iomem *se7722_irq_regs; |
| struct irq_domain *se7722_irq_domain; |
| |
| static void se7722_irq_demux(unsigned int irq, struct irq_desc *desc) |
| { |
| struct irq_data *data = irq_desc_get_irq_data(desc); |
| struct irq_chip *chip = irq_data_get_irq_chip(data); |
| unsigned long mask; |
| int bit; |
| |
| chip->irq_mask_ack(data); |
| |
| mask = ioread16(se7722_irq_regs + IRQ01_STS_REG); |
| |
| for_each_set_bit(bit, &mask, SE7722_FPGA_IRQ_NR) |
| generic_handle_irq(irq_linear_revmap(se7722_irq_domain, bit)); |
| |
| chip->irq_unmask(data); |
| } |
| |
| static void __init se7722_domain_init(void) |
| { |
| int i; |
| |
| se7722_irq_domain = irq_domain_add_linear(NULL, SE7722_FPGA_IRQ_NR, |
| &irq_domain_simple_ops, NULL); |
| if (unlikely(!se7722_irq_domain)) { |
| printk("Failed to get IRQ domain\n"); |
| return; |
| } |
| |
| for (i = 0; i < SE7722_FPGA_IRQ_NR; i++) { |
| int irq = irq_create_mapping(se7722_irq_domain, i); |
| |
| if (unlikely(irq == 0)) { |
| printk("Failed to allocate IRQ %d\n", i); |
| return; |
| } |
| } |
| } |
| |
| static void __init se7722_gc_init(void) |
| { |
| struct irq_chip_generic *gc; |
| struct irq_chip_type *ct; |
| unsigned int irq_base; |
| |
| irq_base = irq_linear_revmap(se7722_irq_domain, 0); |
| |
| gc = irq_alloc_generic_chip(DRV_NAME, 1, irq_base, se7722_irq_regs, |
| handle_level_irq); |
| if (unlikely(!gc)) |
| return; |
| |
| ct = gc->chip_types; |
| ct->chip.irq_mask = irq_gc_mask_set_bit; |
| ct->chip.irq_unmask = irq_gc_mask_clr_bit; |
| |
| ct->regs.mask = IRQ01_MASK_REG; |
| |
| irq_setup_generic_chip(gc, IRQ_MSK(SE7722_FPGA_IRQ_NR), |
| IRQ_GC_INIT_MASK_CACHE, |
| IRQ_NOREQUEST | IRQ_NOPROBE, 0); |
| |
| irq_set_chained_handler(IRQ0_IRQ, se7722_irq_demux); |
| irq_set_irq_type(IRQ0_IRQ, IRQ_TYPE_LEVEL_LOW); |
| |
| irq_set_chained_handler(IRQ1_IRQ, se7722_irq_demux); |
| irq_set_irq_type(IRQ1_IRQ, IRQ_TYPE_LEVEL_LOW); |
| } |
| |
| /* |
| * Initialize FPGA IRQs |
| */ |
| void __init init_se7722_IRQ(void) |
| { |
| se7722_irq_regs = ioremap(IRQ01_BASE_ADDR, SZ_16); |
| if (unlikely(!se7722_irq_regs)) { |
| printk("Failed to remap IRQ01 regs\n"); |
| return; |
| } |
| |
| /* |
| * All FPGA IRQs disabled by default |
| */ |
| iowrite16(0, se7722_irq_regs + IRQ01_MASK_REG); |
| |
| __raw_writew(0x2000, 0xb03fffec); /* mrshpc irq enable */ |
| |
| se7722_domain_init(); |
| se7722_gc_init(); |
| } |