1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Hitachi UL SolutionEngine 7722 FPGA IRQ Support. 4 * 5 * Copyright (C) 2007 Nobuhiro Iwamatsu 6 * Copyright (C) 2012 Paul Mundt 7 */ 8 #define DRV_NAME "SE7722-FPGA" 9 #define pr_fmt(fmt) DRV_NAME ": " fmt 10 11 #include <linux/init.h> 12 #include <linux/irq.h> 13 #include <linux/interrupt.h> 14 #include <linux/irqdomain.h> 15 #include <linux/io.h> 16 #include <linux/err.h> 17 #include <linux/sizes.h> 18 #include <mach-se/mach/se7722.h> 19 20 #define IRQ01_BASE_ADDR 0x11800000 21 #define IRQ01_MODE_REG 0 22 #define IRQ01_STS_REG 4 23 #define IRQ01_MASK_REG 8 24 25 static void __iomem *se7722_irq_regs; 26 struct irq_domain *se7722_irq_domain; 27 28 static void se7722_irq_demux(struct irq_desc *desc) 29 { 30 struct irq_data *data = irq_desc_get_irq_data(desc); 31 struct irq_chip *chip = irq_data_get_irq_chip(data); 32 unsigned long mask; 33 int bit; 34 35 chip->irq_mask_ack(data); 36 37 mask = ioread16(se7722_irq_regs + IRQ01_STS_REG); 38 39 for_each_set_bit(bit, &mask, SE7722_FPGA_IRQ_NR) 40 generic_handle_irq(irq_linear_revmap(se7722_irq_domain, bit)); 41 42 chip->irq_unmask(data); 43 } 44 45 static void __init se7722_domain_init(void) 46 { 47 int i; 48 49 se7722_irq_domain = irq_domain_add_linear(NULL, SE7722_FPGA_IRQ_NR, 50 &irq_domain_simple_ops, NULL); 51 if (unlikely(!se7722_irq_domain)) { 52 printk("Failed to get IRQ domain\n"); 53 return; 54 } 55 56 for (i = 0; i < SE7722_FPGA_IRQ_NR; i++) { 57 int irq = irq_create_mapping(se7722_irq_domain, i); 58 59 if (unlikely(irq == 0)) { 60 printk("Failed to allocate IRQ %d\n", i); 61 return; 62 } 63 } 64 } 65 66 static void __init se7722_gc_init(void) 67 { 68 struct irq_chip_generic *gc; 69 struct irq_chip_type *ct; 70 unsigned int irq_base; 71 72 irq_base = irq_linear_revmap(se7722_irq_domain, 0); 73 74 gc = irq_alloc_generic_chip(DRV_NAME, 1, irq_base, se7722_irq_regs, 75 handle_level_irq); 76 if (unlikely(!gc)) 77 return; 78 79 ct = gc->chip_types; 80 ct->chip.irq_mask = irq_gc_mask_set_bit; 81 ct->chip.irq_unmask = irq_gc_mask_clr_bit; 82 83 ct->regs.mask = IRQ01_MASK_REG; 84 85 irq_setup_generic_chip(gc, IRQ_MSK(SE7722_FPGA_IRQ_NR), 86 IRQ_GC_INIT_MASK_CACHE, 87 IRQ_NOREQUEST | IRQ_NOPROBE, 0); 88 89 irq_set_chained_handler(IRQ0_IRQ, se7722_irq_demux); 90 irq_set_irq_type(IRQ0_IRQ, IRQ_TYPE_LEVEL_LOW); 91 92 irq_set_chained_handler(IRQ1_IRQ, se7722_irq_demux); 93 irq_set_irq_type(IRQ1_IRQ, IRQ_TYPE_LEVEL_LOW); 94 } 95 96 /* 97 * Initialize FPGA IRQs 98 */ 99 void __init init_se7722_IRQ(void) 100 { 101 se7722_irq_regs = ioremap(IRQ01_BASE_ADDR, SZ_16); 102 if (unlikely(!se7722_irq_regs)) { 103 printk("Failed to remap IRQ01 regs\n"); 104 return; 105 } 106 107 /* 108 * All FPGA IRQs disabled by default 109 */ 110 iowrite16(0, se7722_irq_regs + IRQ01_MASK_REG); 111 112 __raw_writew(0x2000, 0xb03fffec); /* mrshpc irq enable */ 113 114 se7722_domain_init(); 115 se7722_gc_init(); 116 } 117