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 irq_base, i; 77 78 printk(KERN_INFO 79 "HD64461 configured at 0x%x on irq %d(mapped into %d to %d)\n", 80 HD64461_IOBASE, CONFIG_HD64461_IRQ, HD64461_IRQBASE, 81 HD64461_IRQBASE + 15); 82 83 /* Should be at processor specific part.. */ 84 #if defined(CONFIG_CPU_SUBTYPE_SH7709) 85 __raw_writew(0x2240, INTC_ICR1); 86 #endif 87 __raw_writew(0xffff, HD64461_NIMR); 88 89 irq_base = irq_alloc_descs(HD64461_IRQBASE, HD64461_IRQBASE, 16, -1); 90 if (IS_ERR_VALUE(irq_base)) { 91 pr_err("%s: failed hooking irqs for HD64461\n", __func__); 92 return irq_base; 93 } 94 95 for (i = 0; i < 16; i++) 96 irq_set_chip_and_handler(irq_base + i, &hd64461_irq_chip, 97 handle_level_irq); 98 99 irq_set_chained_handler(CONFIG_HD64461_IRQ, hd64461_irq_demux); 100 irq_set_irq_type(CONFIG_HD64461_IRQ, IRQ_TYPE_LEVEL_LOW); 101 102 #ifdef CONFIG_HD64461_ENABLER 103 printk(KERN_INFO "HD64461: enabling PCMCIA devices\n"); 104 __raw_writeb(0x4c, HD64461_PCC1CSCIER); 105 __raw_writeb(0x00, HD64461_PCC1CSCR); 106 #endif 107 108 return 0; 109 } 110 111 module_init(setup_hd64461); 112