aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/plat-mxc/3ds_debugboard.c
blob: 5c10ad05df740fe6d514ad61fea52b3cd01f12c5 (plain) (blame)
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
/*
 * Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
 * Copyright (C) 2010 Jason Wang <jason77.wang@gmail.com>
 *
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */

#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/module.h>
#include <linux/smsc911x.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/fixed.h>

#include <mach/hardware.h>

/* LAN9217 ethernet base address */
#define LAN9217_BASE_ADDR(n)	(n + 0x0)
/* External UART */
#define UARTA_BASE_ADDR(n)	(n + 0x8000)
#define UARTB_BASE_ADDR(n)	(n + 0x10000)

#define BOARD_IO_ADDR(n)	(n + 0x20000)
/* LED switchs */
#define LED_SWITCH_REG		0x00
/* buttons */
#define SWITCH_BUTTONS_REG	0x08
/* status, interrupt */
#define INTR_STATUS_REG	0x10
#define INTR_MASK_REG		0x38
#define INTR_RESET_REG		0x20
/* magic word for debug CPLD */
#define MAGIC_NUMBER1_REG	0x40
#define MAGIC_NUMBER2_REG	0x48
/* CPLD code version */
#define CPLD_CODE_VER_REG	0x50
/* magic word for debug CPLD */
#define MAGIC_NUMBER3_REG	0x58
/* module reset register*/
#define MODULE_RESET_REG	0x60
/* CPU ID and Personality ID */
#define MCU_BOARD_ID_REG	0x68

#define MXC_MAX_EXP_IO_LINES	16

/* interrupts like external uart , external ethernet etc*/
#define EXPIO_INT_ENET		0
#define EXPIO_INT_XUART_A	1
#define EXPIO_INT_XUART_B	2
#define EXPIO_INT_BUTTON_A	3
#define EXPIO_INT_BUTTON_B	4

static void __iomem *brd_io;
static struct irq_domain *domain;

static struct resource smsc911x_resources[] = {
	{
		.flags = IORESOURCE_MEM,
	} , {
		.flags = IORESOURCE_IRQ,
	},
};

static struct smsc911x_platform_config smsc911x_config = {
	.irq_polarity = SMSC911X_IRQ_POLARITY_ACTIVE_LOW,
	.flags = SMSC911X_USE_32BIT | SMSC911X_FORCE_INTERNAL_PHY,
};

static struct platform_device smsc_lan9217_device = {
	.name = "smsc911x",
	.id = -1,
	.dev = {
		.platform_data = &smsc911x_config,
	},
	.num_resources = ARRAY_SIZE(smsc911x_resources),
	.resource = smsc911x_resources,
};

static void mxc_expio_irq_handler(u32 irq, struct irq_desc *desc)
{
	u32 imr_val;
	u32 int_valid;
	u32 expio_irq;

	/* irq = gpio irq number */
	desc->irq_data.chip->irq_mask(&desc->irq_data);

	imr_val = __raw_readw(brd_io + INTR_MASK_REG);
	int_valid = __raw_readw(brd_io + INTR_STATUS_REG) & ~imr_val;

	expio_irq = 0;
	for (; int_valid != 0; int_valid >>= 1, expio_irq++) {
		if ((int_valid & 1) == 0)
			continue;
		generic_handle_irq(irq_find_mapping(domain, expio_irq));
	}

	desc->irq_data.chip->irq_ack(&desc->irq_data);
	desc->irq_data.chip->irq_unmask(&desc->irq_data);
}

/*
 * Disable an expio pin's interrupt by setting the bit in the imr.
 * Irq is an expio virtual irq number
 */
static void expio_mask_irq(struct irq_data *d)
{
	u16 reg;
	u32 expio = d->hwirq;

	reg = __raw_readw(brd_io + INTR_MASK_REG);
	reg |= (1 << expio);
	__raw_writew(reg, brd_io + INTR_MASK_REG);
}

static void expio_ack_irq(struct irq_data *d)
{
	u32 expio = d->hwirq;

	__raw_writew(1 << expio, brd_io + INTR_RESET_REG);
	__raw_writew(0, brd_io + INTR_RESET_REG);
	expio_mask_irq(d);
}

static void expio_unmask_irq(struct irq_data *d)
{
	u16 reg;
	u32 expio = d->hwirq;

	reg = __raw_readw(brd_io + INTR_MASK_REG);
	reg &= ~(1 << expio);
	__raw_writew(reg, brd_io + INTR_MASK_REG);
}

static struct irq_chip expio_irq_chip = {
	.irq_ack = expio_ack_irq,
	.irq_mask = expio_mask_irq,
	.irq_unmask = expio_unmask_irq,
};

static struct regulator_consumer_supply dummy_supplies[] = {
	REGULATOR_SUPPLY("vdd33a", "smsc911x"),
	REGULATOR_SUPPLY("vddvario", "smsc911x"),
};

int __init mxc_expio_init(u32 base, u32 intr_gpio)
{
	u32 p_irq = gpio_to_irq(intr_gpio);
	int irq_base;
	int i;

	brd_io = ioremap(BOARD_IO_ADDR(base), SZ_4K);
	if (brd_io == NULL)
		return -ENOMEM;

	if ((__raw_readw(brd_io + MAGIC_NUMBER1_REG) != 0xAAAA) ||
	    (__raw_readw(brd_io + MAGIC_NUMBER2_REG) != 0x5555) ||
	    (__raw_readw(brd_io + MAGIC_NUMBER3_REG) != 0xCAFE)) {
		pr_info("3-Stack Debug board not detected\n");
		iounmap(brd_io);
		brd_io = NULL;
		return -ENODEV;
	}

	pr_info("3-Stack Debug board detected, rev = 0x%04X\n",
		readw(brd_io + CPLD_CODE_VER_REG));

	/*
	 * Configure INT line as GPIO input
	 */
	gpio_request(intr_gpio, "expio_pirq");
	gpio_direction_input(intr_gpio);

	/* disable the interrupt and clear the status */
	__raw_writew(0, brd_io + INTR_MASK_REG);
	__raw_writew(0xFFFF, brd_io + INTR_RESET_REG);
	__raw_writew(0, brd_io + INTR_RESET_REG);
	__raw_writew(0x1F, brd_io + INTR_MASK_REG);

	irq_base = irq_alloc_descs(-1, 0, MXC_MAX_EXP_IO_LINES, numa_node_id());
	WARN_ON(irq_base < 0);

	domain = irq_domain_add_legacy(NULL, MXC_MAX_EXP_IO_LINES, irq_base, 0,
				       &irq_domain_simple_ops, NULL);
	WARN_ON(!domain);

	for (i = irq_base; i < irq_base + MXC_MAX_EXP_IO_LINES; i++) {
		irq_set_chip_and_handler(i, &expio_irq_chip, handle_level_irq);
		set_irq_flags(i, IRQF_VALID);
	}
	irq_set_irq_type(p_irq, IRQF_TRIGGER_LOW);
	irq_set_chained_handler(p_irq, mxc_expio_irq_handler);

	/* Register Lan device on the debugboard */
	regulator_register_fixed(0, dummy_supplies, ARRAY_SIZE(dummy_supplies));

	smsc911x_resources[0].start = LAN9217_BASE_ADDR(base);
	smsc911x_resources[0].end = LAN9217_BASE_ADDR(base) + 0x100 - 1;
	smsc911x_resources[1].start = irq_find_mapping(domain, EXPIO_INT_ENET);
	smsc911x_resources[1].end = irq_find_mapping(domain, EXPIO_INT_ENET);
	platform_device_register(&smsc_lan9217_device);

	return 0;
}