1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2000 YAEGASHI Takeshi 4 * Hitachi HD64461 companion chip support 5 */ 6 7 #include <linux/sched.h> 8 #include <linux/module.h> 9 #include <linux/kernel.h> 10 #include <linux/param.h> 11 #include <linux/interrupt.h> 12 #include <linux/init.h> 13 #include <linux/irq.h> 14 #include <linux/io.h> 15 #include <asm/irq.h> 16 #include <asm/hd64461.h> 17 18 /* This belongs in cpu specific */ 19 #define INTC_ICR1 0xA4140010UL 20 21 static void hd64461_mask_irq(struct irq_data *data) 22 { 23 unsigned int irq = data->irq; 24 unsigned short nimr; 25 unsigned short mask = 1 << (irq - HD64461_IRQBASE); 26 27 nimr = __raw_readw(HD64461_NIMR); 28 nimr |= mask; 29 __raw_writew(nimr, HD64461_NIMR); 30 } 31 32 static void hd64461_unmask_irq(struct irq_data *data) 33 { 34 unsigned int irq = data->irq; 35 unsigned short nimr; 36 unsigned short mask = 1 << (irq - HD64461_IRQBASE); 37 38 nimr = __raw_readw(HD64461_NIMR); 39 nimr &= ~mask; 40 __raw_writew(nimr, HD64461_NIMR); 41 } 42 43 static void hd64461_mask_and_ack_irq(struct irq_data *data) 44 { 45 hd64461_mask_irq(data); 46 47 #ifdef CONFIG_HD64461_ENABLER 48 if (data->irq == HD64461_IRQBASE + 13) 49 __raw_writeb(0x00, HD64461_PCC1CSCR); 50 #endif 51 } 52 53 static struct irq_chip hd64461_irq_chip = { 54 .name = "HD64461-IRQ", 55 .irq_mask = hd64461_mask_irq, 56 .irq_mask_ack = hd64461_mask_and_ack_irq, 57 .irq_unmask = hd64461_unmask_irq, 58 }; 59 60 static void hd64461_irq_demux(struct irq_desc *desc) 61 { 62 unsigned short intv = __raw_readw(HD64461_NIRR); 63 unsigned int ext_irq = HD64461_IRQBASE; 64 65 intv &= (1 << HD64461_IRQ_NUM) - 1; 66 67 for (; intv; intv >>= 1, ext_irq++) { 68 if (!(intv & 1)) 69 continue; 70 71 generic_handle_irq(ext_irq); 72 } 73 } 74 75 static int __init setup_hd64461(void) 76 { 77 int irq_base, i; 78 79 printk(KERN_INFO 80 "HD64461 configured at 0x%x on irq %d(mapped into %d to %d)\n", 81 HD64461_IOBASE, CONFIG_HD64461_IRQ, HD64461_IRQBASE, 82 HD64461_IRQBASE + 15); 83 84 /* Should be at processor specific part.. */ 85 #if defined(CONFIG_CPU_SUBTYPE_SH7709) 86 __raw_writew(0x2240, INTC_ICR1); 87 #endif 88 __raw_writew(0xffff, HD64461_NIMR); 89 90 irq_base = irq_alloc_descs(HD64461_IRQBASE, HD64461_IRQBASE, 16, -1); 91 if (IS_ERR_VALUE(irq_base)) { 92 pr_err("%s: failed hooking irqs for HD64461\n", __func__); 93 return irq_base; 94 } 95 96 for (i = 0; i < 16; i++) 97 irq_set_chip_and_handler(irq_base + i, &hd64461_irq_chip, 98 handle_level_irq); 99 100 irq_set_chained_handler(CONFIG_HD64461_IRQ, hd64461_irq_demux); 101 irq_set_irq_type(CONFIG_HD64461_IRQ, IRQ_TYPE_LEVEL_LOW); 102 103 #ifdef CONFIG_HD64461_ENABLER 104 printk(KERN_INFO "HD64461: enabling PCMCIA devices\n"); 105 __raw_writeb(0x4c, HD64461_PCC1CSCIER); 106 __raw_writeb(0x00, HD64461_PCC1CSCR); 107 #endif 108 109 return 0; 110 } 111 112 module_init(setup_hd64461); 113