2 * Copyright (C) 2000 YAEGASHI Takeshi
3 * Hitachi HD64461 companion chip support
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>
15 #include <asm/hd64461.h>
17 /* This belongs in cpu specific */
18 #define INTC_ICR1 0xA4140010UL
20 static void hd64461_mask_irq(struct irq_data *data)
22 unsigned int irq = data->irq;
24 unsigned short mask = 1 << (irq - HD64461_IRQBASE);
26 nimr = __raw_readw(HD64461_NIMR);
28 __raw_writew(nimr, HD64461_NIMR);
31 static void hd64461_unmask_irq(struct irq_data *data)
33 unsigned int irq = data->irq;
35 unsigned short mask = 1 << (irq - HD64461_IRQBASE);
37 nimr = __raw_readw(HD64461_NIMR);
39 __raw_writew(nimr, HD64461_NIMR);
42 static void hd64461_mask_and_ack_irq(struct irq_data *data)
44 hd64461_mask_irq(data);
46 #ifdef CONFIG_HD64461_ENABLER
47 if (data->irq == HD64461_IRQBASE + 13)
48 __raw_writeb(0x00, HD64461_PCC1CSCR);
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,
59 static void hd64461_irq_demux(unsigned int irq, struct irq_desc *desc)
61 unsigned short intv = __raw_readw(HD64461_NIRR);
62 unsigned int ext_irq = HD64461_IRQBASE;
64 intv &= (1 << HD64461_IRQ_NUM) - 1;
66 for (; intv; intv >>= 1, ext_irq++) {
70 generic_handle_irq(ext_irq);
74 int __init setup_hd64461(void)
76 int i, nid = cpu_to_node(boot_cpu_data);
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);
86 /* Should be at processor specific part.. */
87 #if defined(CONFIG_CPU_SUBTYPE_SH7709)
88 __raw_writew(0x2240, INTC_ICR1);
90 __raw_writew(0xffff, HD64461_NIMR);
92 /* IRQ 80 -> 95 belongs to HD64461 */
93 for (i = HD64461_IRQBASE; i < HD64461_IRQBASE + 16; i++) {
96 irq = create_irq_nr(i, nid);
97 if (unlikely(irq == 0)) {
98 pr_err("%s: failed hooking irq %d for HD64461\n",
103 if (unlikely(irq != i)) {
104 pr_err("%s: got irq %d but wanted %d, bailing.\n",
110 set_irq_chip_and_handler(i, &hd64461_irq_chip,
114 set_irq_chained_handler(CONFIG_HD64461_IRQ, hd64461_irq_demux);
115 set_irq_type(CONFIG_HD64461_IRQ, IRQ_TYPE_LEVEL_LOW);
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);
126 module_init(setup_hd64461);