aboutsummaryrefslogtreecommitdiff
path: root/arch/sh/cchips/hd6446x/hd64465/setup.c
blob: 30573d3e1966717c46c420703972166625cb785f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
/*
 * $Id: setup.c,v 1.4 2003/08/03 03:05:10 lethal Exp $
 *
 * Setup and IRQ handling code for the HD64465 companion chip.
 * by Greg Banks <gbanks@pocketpenguins.com>
 * Copyright (c) 2000 PocketPenguins Inc
 *
 * Derived from setup_hd64461.c which bore the message:
 * Copyright (C) 2000 YAEGASHI Takeshi
 */

#include <linux/sched.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/irq.h>

#include <asm/io.h>
#include <asm/irq.h>

#include <asm/hd64465/hd64465.h>

static void disable_hd64465_irq(unsigned int irq)
{
	unsigned short nimr;
	unsigned short mask = 1 << (irq - HD64465_IRQ_BASE);

    	pr_debug("disable_hd64465_irq(%d): mask=%x\n", irq, mask);
	nimr = inw(HD64465_REG_NIMR);
	nimr |= mask;
	outw(nimr, HD64465_REG_NIMR);
}


static void enable_hd64465_irq(unsigned int irq)
{
	unsigned short nimr;
	unsigned short mask = 1 << (irq - HD64465_IRQ_BASE);

    	pr_debug("enable_hd64465_irq(%d): mask=%x\n", irq, mask);
	nimr = inw(HD64465_REG_NIMR);
	nimr &= ~mask;
	outw(nimr, HD64465_REG_NIMR);
}


static void mask_and_ack_hd64465(unsigned int irq)
{
	disable_hd64465_irq(irq);
}


static void end_hd64465_irq(unsigned int irq)
{
	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
		enable_hd64465_irq(irq);
}


static unsigned int startup_hd64465_irq(unsigned int irq)
{ 
	enable_hd64465_irq(irq);
	return 0;
}


static void shutdown_hd64465_irq(unsigned int irq)
{
	disable_hd64465_irq(irq);
}


static struct hw_interrupt_type hd64465_irq_type = {
	.typename	= "HD64465-IRQ",
	.startup	= startup_hd64465_irq,
	.shutdown	= shutdown_hd64465_irq,
	.enable		= enable_hd64465_irq,
	.disable	= disable_hd64465_irq,
	.ack		= mask_and_ack_hd64465,
	.end		= end_hd64465_irq,
};


static irqreturn_t hd64465_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
	printk(KERN_INFO
	       "HD64465: spurious interrupt, nirr: 0x%x nimr: 0x%x\n",
	       inw(HD64465_REG_NIRR), inw(HD64465_REG_NIMR));

	return IRQ_NONE;
}


/*====================================================*/

/*
 * Support for a secondary IRQ demux step.  This is necessary
 * because the HD64465 presents a very thin interface to the
 * PCMCIA bus; a lot of features (such as remapping interrupts)
 * normally done in hardware by other PCMCIA host bridges is
 * instead done in software.
 */
static struct
{
    int (*func)(int, void *);
    void *dev;
} hd64465_demux[HD64465_IRQ_NUM];

void hd64465_register_irq_demux(int irq,
		int (*demux)(int irq, void *dev), void *dev)
{
    	hd64465_demux[irq - HD64465_IRQ_BASE].func = demux;
    	hd64465_demux[irq - HD64465_IRQ_BASE].dev = dev;
}
EXPORT_SYMBOL(hd64465_register_irq_demux);

void hd64465_unregister_irq_demux(int irq)
{
    	hd64465_demux[irq - HD64465_IRQ_BASE].func = 0;
}
EXPORT_SYMBOL(hd64465_unregister_irq_demux);



int hd64465_irq_demux(int irq)
{
	if (irq == CONFIG_HD64465_IRQ) {
		unsigned short i, bit;
		unsigned short nirr = inw(HD64465_REG_NIRR);
		unsigned short nimr = inw(HD64465_REG_NIMR);

    	    	pr_debug("hd64465_irq_demux, nirr=%04x, nimr=%04x\n", nirr, nimr);
		nirr &= ~nimr;
		for (bit = 1, i = 0 ; i < HD64465_IRQ_NUM ; bit <<= 1, i++)
		    if (nirr & bit)
		    	break;

    	    	if (i < HD64465_IRQ_NUM) {
		    irq = HD64465_IRQ_BASE + i;
    	    	    if (hd64465_demux[i].func != 0)
		    	irq = hd64465_demux[i].func(irq, hd64465_demux[i].dev);
		}
	}
	return irq;
}

static struct irqaction irq0  = { hd64465_interrupt, IRQF_DISABLED, CPU_MASK_NONE, "HD64465", NULL, NULL};


static int __init setup_hd64465(void)
{
	int i;
	unsigned short rev;
	unsigned short smscr;

	if (!MACH_HD64465)
		return 0;

	printk(KERN_INFO "HD64465 configured at 0x%x on irq %d(mapped into %d to %d)\n",
	       CONFIG_HD64465_IOBASE,
	       CONFIG_HD64465_IRQ,
	       HD64465_IRQ_BASE,
	       HD64465_IRQ_BASE+HD64465_IRQ_NUM-1);

	if (inw(HD64465_REG_SDID) != HD64465_SDID) {
		printk(KERN_ERR "HD64465 device ID not found, check base address\n");
	}

	rev = inw(HD64465_REG_SRR);
	printk(KERN_INFO "HD64465 hardware revision %d.%d\n", (rev >> 8) & 0xff, rev & 0xff);
	       
	outw(0xffff, HD64465_REG_NIMR); 	/* mask all interrupts */

	for (i = 0; i < HD64465_IRQ_NUM ; i++) {
		irq_desc[HD64465_IRQ_BASE + i].chip = &hd64465_irq_type;
	}

	setup_irq(CONFIG_HD64465_IRQ, &irq0);

#ifdef CONFIG_SERIAL
	/* wake up the UART from STANDBY at this point */
	smscr = inw(HD64465_REG_SMSCR);
	outw(smscr & (~HD64465_SMSCR_UARTST), HD64465_REG_SMSCR);

	/* remap IO ports for first ISA serial port to HD64465 UART */
	hd64465_port_map(0x3f8, 8, CONFIG_HD64465_IOBASE + 0x8000, 1);
#endif

	return 0;
}

module_init(setup_hd64465);