1/*
2 * Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
3 * Copyright (C) 2010 Jason Wang <jason77.wang@gmail.com>
4 *
5 * The code contained herein is licensed under the GNU General Public
6 * License. You may obtain a copy of the GNU General Public License
7 * Version 2 or later at the following locations:
8 *
9 * http://www.opensource.org/licenses/gpl-license.html
10 * http://www.gnu.org/copyleft/gpl.html
11 */
12
13#include <linux/interrupt.h>
14#include <linux/irq.h>
15#include <linux/irqdomain.h>
16#include <linux/io.h>
17#include <linux/platform_device.h>
18#include <linux/gpio.h>
19#include <linux/module.h>
20#include <linux/smsc911x.h>
21#include <linux/regulator/machine.h>
22#include <linux/regulator/fixed.h>
23
24#include "hardware.h"
25
26/* LAN9217 ethernet base address */
27#define LAN9217_BASE_ADDR(n)	(n + 0x0)
28/* External UART */
29#define UARTA_BASE_ADDR(n)	(n + 0x8000)
30#define UARTB_BASE_ADDR(n)	(n + 0x10000)
31
32#define BOARD_IO_ADDR(n)	(n + 0x20000)
33/* LED switchs */
34#define LED_SWITCH_REG		0x00
35/* buttons */
36#define SWITCH_BUTTONS_REG	0x08
37/* status, interrupt */
38#define INTR_STATUS_REG	0x10
39#define INTR_MASK_REG		0x38
40#define INTR_RESET_REG		0x20
41/* magic word for debug CPLD */
42#define MAGIC_NUMBER1_REG	0x40
43#define MAGIC_NUMBER2_REG	0x48
44/* CPLD code version */
45#define CPLD_CODE_VER_REG	0x50
46/* magic word for debug CPLD */
47#define MAGIC_NUMBER3_REG	0x58
48/* module reset register*/
49#define MODULE_RESET_REG	0x60
50/* CPU ID and Personality ID */
51#define MCU_BOARD_ID_REG	0x68
52
53#define MXC_MAX_EXP_IO_LINES	16
54
55/* interrupts like external uart , external ethernet etc*/
56#define EXPIO_INT_ENET		0
57#define EXPIO_INT_XUART_A	1
58#define EXPIO_INT_XUART_B	2
59#define EXPIO_INT_BUTTON_A	3
60#define EXPIO_INT_BUTTON_B	4
61
62static void __iomem *brd_io;
63static struct irq_domain *domain;
64
65static struct resource smsc911x_resources[] = {
66	{
67		.flags = IORESOURCE_MEM,
68	} , {
69		.flags = IORESOURCE_IRQ,
70	},
71};
72
73static struct smsc911x_platform_config smsc911x_config = {
74	.irq_polarity = SMSC911X_IRQ_POLARITY_ACTIVE_LOW,
75	.flags = SMSC911X_USE_32BIT | SMSC911X_FORCE_INTERNAL_PHY,
76};
77
78static struct platform_device smsc_lan9217_device = {
79	.name = "smsc911x",
80	.id = -1,
81	.dev = {
82		.platform_data = &smsc911x_config,
83	},
84	.num_resources = ARRAY_SIZE(smsc911x_resources),
85	.resource = smsc911x_resources,
86};
87
88static void mxc_expio_irq_handler(struct irq_desc *desc)
89{
90	u32 imr_val;
91	u32 int_valid;
92	u32 expio_irq;
93
94	/* irq = gpio irq number */
95	desc->irq_data.chip->irq_mask(&desc->irq_data);
96
97	imr_val = __raw_readw(brd_io + INTR_MASK_REG);
98	int_valid = __raw_readw(brd_io + INTR_STATUS_REG) & ~imr_val;
99
100	expio_irq = 0;
101	for (; int_valid != 0; int_valid >>= 1, expio_irq++) {
102		if ((int_valid & 1) == 0)
103			continue;
104		generic_handle_irq(irq_find_mapping(domain, expio_irq));
105	}
106
107	desc->irq_data.chip->irq_ack(&desc->irq_data);
108	desc->irq_data.chip->irq_unmask(&desc->irq_data);
109}
110
111/*
112 * Disable an expio pin's interrupt by setting the bit in the imr.
113 * Irq is an expio virtual irq number
114 */
115static void expio_mask_irq(struct irq_data *d)
116{
117	u16 reg;
118	u32 expio = d->hwirq;
119
120	reg = __raw_readw(brd_io + INTR_MASK_REG);
121	reg |= (1 << expio);
122	__raw_writew(reg, brd_io + INTR_MASK_REG);
123}
124
125static void expio_ack_irq(struct irq_data *d)
126{
127	u32 expio = d->hwirq;
128
129	__raw_writew(1 << expio, brd_io + INTR_RESET_REG);
130	__raw_writew(0, brd_io + INTR_RESET_REG);
131	expio_mask_irq(d);
132}
133
134static void expio_unmask_irq(struct irq_data *d)
135{
136	u16 reg;
137	u32 expio = d->hwirq;
138
139	reg = __raw_readw(brd_io + INTR_MASK_REG);
140	reg &= ~(1 << expio);
141	__raw_writew(reg, brd_io + INTR_MASK_REG);
142}
143
144static struct irq_chip expio_irq_chip = {
145	.irq_ack = expio_ack_irq,
146	.irq_mask = expio_mask_irq,
147	.irq_unmask = expio_unmask_irq,
148};
149
150static struct regulator_consumer_supply dummy_supplies[] = {
151	REGULATOR_SUPPLY("vdd33a", "smsc911x"),
152	REGULATOR_SUPPLY("vddvario", "smsc911x"),
153};
154
155int __init mxc_expio_init(u32 base, u32 intr_gpio)
156{
157	u32 p_irq = gpio_to_irq(intr_gpio);
158	int irq_base;
159	int i;
160
161	brd_io = ioremap(BOARD_IO_ADDR(base), SZ_4K);
162	if (brd_io == NULL)
163		return -ENOMEM;
164
165	if ((__raw_readw(brd_io + MAGIC_NUMBER1_REG) != 0xAAAA) ||
166	    (__raw_readw(brd_io + MAGIC_NUMBER2_REG) != 0x5555) ||
167	    (__raw_readw(brd_io + MAGIC_NUMBER3_REG) != 0xCAFE)) {
168		pr_info("3-Stack Debug board not detected\n");
169		iounmap(brd_io);
170		brd_io = NULL;
171		return -ENODEV;
172	}
173
174	pr_info("3-Stack Debug board detected, rev = 0x%04X\n",
175		readw(brd_io + CPLD_CODE_VER_REG));
176
177	/*
178	 * Configure INT line as GPIO input
179	 */
180	gpio_request(intr_gpio, "expio_pirq");
181	gpio_direction_input(intr_gpio);
182
183	/* disable the interrupt and clear the status */
184	__raw_writew(0, brd_io + INTR_MASK_REG);
185	__raw_writew(0xFFFF, brd_io + INTR_RESET_REG);
186	__raw_writew(0, brd_io + INTR_RESET_REG);
187	__raw_writew(0x1F, brd_io + INTR_MASK_REG);
188
189	irq_base = irq_alloc_descs(-1, 0, MXC_MAX_EXP_IO_LINES, numa_node_id());
190	WARN_ON(irq_base < 0);
191
192	domain = irq_domain_add_legacy(NULL, MXC_MAX_EXP_IO_LINES, irq_base, 0,
193				       &irq_domain_simple_ops, NULL);
194	WARN_ON(!domain);
195
196	for (i = irq_base; i < irq_base + MXC_MAX_EXP_IO_LINES; i++) {
197		irq_set_chip_and_handler(i, &expio_irq_chip, handle_level_irq);
198		irq_clear_status_flags(i, IRQ_NOREQUEST);
199	}
200	irq_set_irq_type(p_irq, IRQF_TRIGGER_LOW);
201	irq_set_chained_handler(p_irq, mxc_expio_irq_handler);
202
203	/* Register Lan device on the debugboard */
204	regulator_register_fixed(0, dummy_supplies, ARRAY_SIZE(dummy_supplies));
205
206	smsc911x_resources[0].start = LAN9217_BASE_ADDR(base);
207	smsc911x_resources[0].end = LAN9217_BASE_ADDR(base) + 0x100 - 1;
208	smsc911x_resources[1].start = irq_find_mapping(domain, EXPIO_INT_ENET);
209	smsc911x_resources[1].end = irq_find_mapping(domain, EXPIO_INT_ENET);
210	platform_device_register(&smsc_lan9217_device);
211
212	return 0;
213}
214