aboutsummaryrefslogtreecommitdiff
path: root/arch/arm/mach-h720x/common.c
blob: 3a410e3f1e5fe674a409c2ee16d9ee4d7f7c6371 (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
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
/*
 * linux/arch/arm/mach-h720x/common.c
 *
 * Copyright (C) 2003 Thomas Gleixner <tglx@linutronix.de>
 *               2003 Robert Schwebel <r.schwebel@pengutronix.de>
 *               2004 Sascha Hauer    <s.hauer@pengutronix.de>
 *
 * common stuff for Hynix h720x processors
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/mman.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>

#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/dma.h>
#include <mach/hardware.h>
#include <asm/irq.h>
#include <asm/mach/irq.h>
#include <asm/mach/map.h>
#include <mach/irqs.h>

#include <asm/mach/dma.h>

#if 0
#define IRQDBG(args...) printk(args)
#else
#define IRQDBG(args...) do {} while(0)
#endif

void __init arch_dma_init(dma_t *dma)
{
}

/*
 * Return usecs since last timer reload
 * (timercount * (usecs perjiffie)) / (ticks per jiffie)
 */
unsigned long h720x_gettimeoffset(void)
{
	return (CPU_REG (TIMER_VIRT, TM0_COUNT) * tick_usec) / LATCH;
}

/*
 * mask Global irq's
 */
static void mask_global_irq (unsigned int irq )
{
	CPU_REG (IRQC_VIRT, IRQC_IER) &= ~(1 << irq);
}

/*
 * unmask Global irq's
 */
static void unmask_global_irq (unsigned int irq )
{
	CPU_REG (IRQC_VIRT, IRQC_IER) |= (1 << irq);
}


/*
 * ack GPIO irq's
 * Ack only for edge triggered int's valid
 */
static void inline ack_gpio_irq(u32 irq)
{
	u32 reg_base = GPIO_VIRT(IRQ_TO_REGNO(irq));
	u32 bit = IRQ_TO_BIT(irq);
	if ( (CPU_REG (reg_base, GPIO_EDGE) & bit))
		CPU_REG (reg_base, GPIO_CLR) = bit;
}

/*
 * mask GPIO irq's
 */
static void inline mask_gpio_irq(u32 irq)
{
	u32 reg_base = GPIO_VIRT(IRQ_TO_REGNO(irq));
	u32 bit = IRQ_TO_BIT(irq);
	CPU_REG (reg_base, GPIO_MASK) &= ~bit;
}

/*
 * unmask GPIO irq's
 */
static void inline unmask_gpio_irq(u32 irq)
{
	u32 reg_base = GPIO_VIRT(IRQ_TO_REGNO(irq));
	u32 bit = IRQ_TO_BIT(irq);
	CPU_REG (reg_base, GPIO_MASK) |= bit;
}

static void
h720x_gpio_handler(unsigned int mask, unsigned int irq,
                 struct irq_desc *desc)
{
	IRQDBG("%s irq: %d\n", __func__, irq);
	desc = irq_desc + irq;
	while (mask) {
		if (mask & 1) {
			IRQDBG("handling irq %d\n", irq);
			desc_handle_irq(irq, desc);
		}
		irq++;
		desc++;
		mask >>= 1;
	}
}

static void
h720x_gpioa_demux_handler(unsigned int irq_unused, struct irq_desc *desc)
{
	unsigned int mask, irq;

	mask = CPU_REG(GPIO_A_VIRT,GPIO_STAT);
	irq = IRQ_CHAINED_GPIOA(0);
	IRQDBG("%s mask: 0x%08x irq: %d\n", __func__, mask,irq);
	h720x_gpio_handler(mask, irq, desc);
}

static void
h720x_gpiob_demux_handler(unsigned int irq_unused, struct irq_desc *desc)
{
	unsigned int mask, irq;
	mask = CPU_REG(GPIO_B_VIRT,GPIO_STAT);
	irq = IRQ_CHAINED_GPIOB(0);
	IRQDBG("%s mask: 0x%08x irq: %d\n", __func__, mask,irq);
	h720x_gpio_handler(mask, irq, desc);
}

static void
h720x_gpioc_demux_handler(unsigned int irq_unused, struct irq_desc *desc)
{
	unsigned int mask, irq;

	mask = CPU_REG(GPIO_C_VIRT,GPIO_STAT);
	irq = IRQ_CHAINED_GPIOC(0);
	IRQDBG("%s mask: 0x%08x irq: %d\n", __func__, mask,irq);
	h720x_gpio_handler(mask, irq, desc);
}

static void
h720x_gpiod_demux_handler(unsigned int irq_unused, struct irq_desc *desc)
{
	unsigned int mask, irq;

	mask = CPU_REG(GPIO_D_VIRT,GPIO_STAT);
	irq = IRQ_CHAINED_GPIOD(0);
	IRQDBG("%s mask: 0x%08x irq: %d\n", __func__, mask,irq);
	h720x_gpio_handler(mask, irq, desc);
}

#ifdef CONFIG_CPU_H7202
static void
h720x_gpioe_demux_handler(unsigned int irq_unused, struct irq_desc *desc)
{
	unsigned int mask, irq;

	mask = CPU_REG(GPIO_E_VIRT,GPIO_STAT);
	irq = IRQ_CHAINED_GPIOE(0);
	IRQDBG("%s mask: 0x%08x irq: %d\n", __func__, mask,irq);
	h720x_gpio_handler(mask, irq, desc);
}
#endif

static struct irq_chip h720x_global_chip = {
	.ack = mask_global_irq,
	.mask = mask_global_irq,
	.unmask = unmask_global_irq,
};

static struct irq_chip h720x_gpio_chip = {
	.ack = ack_gpio_irq,
	.mask = mask_gpio_irq,
	.unmask = unmask_gpio_irq,
};

/*
 * Initialize IRQ's, mask all, enable multiplexed irq's
 */
void __init h720x_init_irq (void)
{
	int 	irq;

	/* Mask global irq's */
	CPU_REG (IRQC_VIRT, IRQC_IER) = 0x0;

	/* Mask all multiplexed irq's */
	CPU_REG (GPIO_A_VIRT, GPIO_MASK) = 0x0;
	CPU_REG (GPIO_B_VIRT, GPIO_MASK) = 0x0;
	CPU_REG (GPIO_C_VIRT, GPIO_MASK) = 0x0;
	CPU_REG (GPIO_D_VIRT, GPIO_MASK) = 0x0;

	/* Initialize global IRQ's, fast path */
	for (irq = 0; irq < NR_GLBL_IRQS; irq++) {
		set_irq_chip(irq, &h720x_global_chip);
		set_irq_handler(irq, handle_level_irq);
		set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
	}

	/* Initialize multiplexed IRQ's, slow path */
	for (irq = IRQ_CHAINED_GPIOA(0) ; irq <= IRQ_CHAINED_GPIOD(31); irq++) {
		set_irq_chip(irq, &h720x_gpio_chip);
		set_irq_handler(irq, handle_edge_irq);
		set_irq_flags(irq, IRQF_VALID );
	}
	set_irq_chained_handler(IRQ_GPIOA, h720x_gpioa_demux_handler);
	set_irq_chained_handler(IRQ_GPIOB, h720x_gpiob_demux_handler);
	set_irq_chained_handler(IRQ_GPIOC, h720x_gpioc_demux_handler);
	set_irq_chained_handler(IRQ_GPIOD, h720x_gpiod_demux_handler);

#ifdef CONFIG_CPU_H7202
	for (irq = IRQ_CHAINED_GPIOE(0) ; irq <= IRQ_CHAINED_GPIOE(31); irq++) {
		set_irq_chip(irq, &h720x_gpio_chip);
		set_irq_handler(irq, handle_edge_irq);
		set_irq_flags(irq, IRQF_VALID );
	}
	set_irq_chained_handler(IRQ_GPIOE, h720x_gpioe_demux_handler);
#endif

	/* Enable multiplexed irq's */
	CPU_REG (IRQC_VIRT, IRQC_IER) = IRQ_ENA_MUX;
}

static struct map_desc h720x_io_desc[] __initdata = {
	{
		.virtual	= IO_VIRT,
		.pfn		= __phys_to_pfn(IO_PHYS),
		.length		= IO_SIZE,
		.type		= MT_DEVICE
	},
};

/* Initialize io tables */
void __init h720x_map_io(void)
{
	iotable_init(h720x_io_desc,ARRAY_SIZE(h720x_io_desc));
}