added 2.6.29.6 aldebaran kernel
[nao-ulib.git] / kernel / 2.6.29.6-aldebaran-rt / arch / sh / cchips / hd6446x / hd64461.c
blob27ceeb948bb1059a142f627c540d07848993e52b
1 /*
2 * Copyright (C) 2000 YAEGASHI Takeshi
3 * Hitachi HD64461 companion chip support
4 */
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>
17 /* This belongs in cpu specific */
18 #define INTC_ICR1 0xA4140010UL
20 static void hd64461_mask_irq(unsigned int irq)
22 unsigned short nimr;
23 unsigned short mask = 1 << (irq - HD64461_IRQBASE);
25 nimr = __raw_readw(HD64461_NIMR);
26 nimr |= mask;
27 __raw_writew(nimr, HD64461_NIMR);
30 static void hd64461_unmask_irq(unsigned int irq)
32 unsigned short nimr;
33 unsigned short mask = 1 << (irq - HD64461_IRQBASE);
35 nimr = __raw_readw(HD64461_NIMR);
36 nimr &= ~mask;
37 __raw_writew(nimr, HD64461_NIMR);
40 static void hd64461_mask_and_ack_irq(unsigned int irq)
42 hd64461_mask_irq(irq);
43 #ifdef CONFIG_HD64461_ENABLER
44 if (irq == HD64461_IRQBASE + 13)
45 __raw_writeb(0x00, HD64461_PCC1CSCR);
46 #endif
49 static struct irq_chip hd64461_irq_chip = {
50 .name = "HD64461-IRQ",
51 .mask = hd64461_mask_irq,
52 .mask_ack = hd64461_mask_and_ack_irq,
53 .unmask = hd64461_unmask_irq,
56 int hd64461_irq_demux(int irq)
58 if (irq == CONFIG_HD64461_IRQ) {
59 unsigned short bit;
60 unsigned short nirr = inw(HD64461_NIRR);
61 unsigned short nimr = inw(HD64461_NIMR);
62 int i;
64 nirr &= ~nimr;
65 for (bit = 1, i = 0; i < 16; bit <<= 1, i++)
66 if (nirr & bit)
67 break;
68 irq = HD64461_IRQBASE + i;
70 return irq;
73 int __init setup_hd64461(void)
75 int i;
77 if (!MACH_HD64461)
78 return 0;
80 printk(KERN_INFO
81 "HD64461 configured at 0x%x on irq %d(mapped into %d to %d)\n",
82 CONFIG_HD64461_IOBASE, CONFIG_HD64461_IRQ, HD64461_IRQBASE,
83 HD64461_IRQBASE + 15);
85 /* Should be at processor specific part.. */
86 #if defined(CONFIG_CPU_SUBTYPE_SH7709)
87 __raw_writew(0x2240, INTC_ICR1);
88 #endif
89 __raw_writew(0xffff, HD64461_NIMR);
91 /* IRQ 80 -> 95 belongs to HD64461 */
92 for (i = HD64461_IRQBASE; i < HD64461_IRQBASE + 16; i++)
93 set_irq_chip_and_handler(i, &hd64461_irq_chip,
94 handle_level_irq);
96 #ifdef CONFIG_HD64461_ENABLER
97 printk(KERN_INFO "HD64461: enabling PCMCIA devices\n");
98 __raw_writeb(0x4c, HD64461_PCC1CSCIER);
99 __raw_writeb(0x00, HD64461_PCC1CSCR);
100 #endif
102 return 0;
105 module_init(setup_hd64461);