1 /* 2 * Copyright (C) 2000 YAEGASHI Takeshi 3 * Hitachi HD64461 companion chip support 4 */ 5 6 #include <linux/sched.h> 7 #include <linux/module.h> 8 #include <linux/kernel.h> 9 #include <linux/param.h> 10 #include <linux/interrupt.h> 11 #include <linux/init.h> 12 #include <linux/irq.h> 13 #include <linux/io.h> 14 #include <asm/irq.h> 15 #include <asm/hd64461.h> 16 17 /* This belongs in cpu specific */ 18 #define INTC_ICR1 0xA4140010UL 19 20 static void hd64461_mask_irq(struct irq_data *data) 21 { 22 unsigned int irq = data->irq; 23 unsigned short nimr; 24 unsigned short mask = 1 << (irq - HD64461_IRQBASE); 25 26 nimr = __raw_readw(HD64461_NIMR); 27 nimr |= mask; 28 __raw_writew(nimr, HD64461_NIMR); 29 } 30 31 static void hd64461_unmask_irq(struct irq_data *data) 32 { 33 unsigned int irq = data->irq; 34 unsigned short nimr; 35 unsigned short mask = 1 << (irq - HD64461_IRQBASE); 36 37 nimr = __raw_readw(HD64461_NIMR); 38 nimr &= ~mask; 39 __raw_writew(nimr, HD64461_NIMR); 40 } 41 42 static void hd64461_mask_and_ack_irq(struct irq_data *data) 43 { 44 hd64461_mask_irq(data); 45 46 #ifdef CONFIG_HD64461_ENABLER 47 if (data->irq == HD64461_IRQBASE + 13) 48 __raw_writeb(0x00, HD64461_PCC1CSCR); 49 #endif 50 } 51 52 static struct irq_chip hd64461_irq_chip = { 53 .name = "HD64461-IRQ", 54 .irq_mask = hd64461_mask_irq, 55 .irq_mask_ack = hd64461_mask_and_ack_irq, 56 .irq_unmask = hd64461_unmask_irq, 57 }; 58 59 static void hd64461_irq_demux(unsigned int irq, struct irq_desc *desc) 60 { 61 unsigned short intv = __raw_readw(HD64461_NIRR); 62 unsigned int ext_irq = HD64461_IRQBASE; 63 64 intv &= (1 << HD64461_IRQ_NUM) - 1; 65 66 for (; intv; intv >>= 1, ext_irq++) { 67 if (!(intv & 1)) 68 continue; 69 70 generic_handle_irq(ext_irq); 71 } 72 } 73 74 int __init setup_hd64461(void) 75 { 76 int i, nid = cpu_to_node(boot_cpu_data); 77 78 if (!MACH_HD64461) 79 return 0; 80 81 printk(KERN_INFO 82 "HD64461 configured at 0x%x on irq %d(mapped into %d to %d)\n", 83 HD64461_IOBASE, CONFIG_HD64461_IRQ, HD64461_IRQBASE, 84 HD64461_IRQBASE + 15); 85 86 /* Should be at processor specific part.. */ 87 #if defined(CONFIG_CPU_SUBTYPE_SH7709) 88 __raw_writew(0x2240, INTC_ICR1); 89 #endif 90 __raw_writew(0xffff, HD64461_NIMR); 91 92 /* IRQ 80 -> 95 belongs to HD64461 */ 93 for (i = HD64461_IRQBASE; i < HD64461_IRQBASE + 16; i++) { 94 unsigned int irq; 95 96 irq = create_irq_nr(i, nid); 97 if (unlikely(irq == 0)) { 98 pr_err("%s: failed hooking irq %d for HD64461\n", 99 __func__, i); 100 return -EBUSY; 101 } 102 103 if (unlikely(irq != i)) { 104 pr_err("%s: got irq %d but wanted %d, bailing.\n", 105 __func__, irq, i); 106 destroy_irq(irq); 107 return -EINVAL; 108 } 109 110 set_irq_chip_and_handler(i, &hd64461_irq_chip, 111 handle_level_irq); 112 } 113 114 set_irq_chained_handler(CONFIG_HD64461_IRQ, hd64461_irq_demux); 115 set_irq_type(CONFIG_HD64461_IRQ, IRQ_TYPE_LEVEL_LOW); 116 117 #ifdef CONFIG_HD64461_ENABLER 118 printk(KERN_INFO "HD64461: enabling PCMCIA devices\n"); 119 __raw_writeb(0x4c, HD64461_PCC1CSCIER); 120 __raw_writeb(0x00, HD64461_PCC1CSCR); 121 #endif 122 123 return 0; 124 } 125 126 module_init(setup_hd64461); 127