1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
4 * Copyright (C) 2010 Jason Wang <jason77.wang@gmail.com>
5 */
6
7 #include <linux/interrupt.h>
8 #include <linux/irq.h>
9 #include <linux/irqdomain.h>
10 #include <linux/io.h>
11 #include <linux/platform_device.h>
12 #include <linux/gpio.h>
13 #include <linux/module.h>
14 #include <linux/smsc911x.h>
15 #include <linux/regulator/machine.h>
16 #include <linux/regulator/fixed.h>
17 #include "3ds_debugboard.h"
18 #include "hardware.h"
19
20 /* LAN9217 ethernet base address */
21 #define LAN9217_BASE_ADDR(n) (n + 0x0)
22 /* External UART */
23 #define UARTA_BASE_ADDR(n) (n + 0x8000)
24 #define UARTB_BASE_ADDR(n) (n + 0x10000)
25
26 #define BOARD_IO_ADDR(n) (n + 0x20000)
27 /* LED switchs */
28 #define LED_SWITCH_REG 0x00
29 /* buttons */
30 #define SWITCH_BUTTONS_REG 0x08
31 /* status, interrupt */
32 #define INTR_STATUS_REG 0x10
33 #define INTR_MASK_REG 0x38
34 #define INTR_RESET_REG 0x20
35 /* magic word for debug CPLD */
36 #define MAGIC_NUMBER1_REG 0x40
37 #define MAGIC_NUMBER2_REG 0x48
38 /* CPLD code version */
39 #define CPLD_CODE_VER_REG 0x50
40 /* magic word for debug CPLD */
41 #define MAGIC_NUMBER3_REG 0x58
42 /* module reset register*/
43 #define MODULE_RESET_REG 0x60
44 /* CPU ID and Personality ID */
45 #define MCU_BOARD_ID_REG 0x68
46
47 #define MXC_MAX_EXP_IO_LINES 16
48
49 /* interrupts like external uart , external ethernet etc*/
50 #define EXPIO_INT_ENET 0
51 #define EXPIO_INT_XUART_A 1
52 #define EXPIO_INT_XUART_B 2
53 #define EXPIO_INT_BUTTON_A 3
54 #define EXPIO_INT_BUTTON_B 4
55
56 static void __iomem *brd_io;
57 static struct irq_domain *domain;
58
59 static struct resource smsc911x_resources[] = {
60 {
61 .flags = IORESOURCE_MEM,
62 } , {
63 .flags = IORESOURCE_IRQ,
64 },
65 };
66
67 static struct smsc911x_platform_config smsc911x_config = {
68 .irq_polarity = SMSC911X_IRQ_POLARITY_ACTIVE_LOW,
69 .flags = SMSC911X_USE_32BIT | SMSC911X_FORCE_INTERNAL_PHY,
70 };
71
72 static struct platform_device smsc_lan9217_device = {
73 .name = "smsc911x",
74 .id = -1,
75 .dev = {
76 .platform_data = &smsc911x_config,
77 },
78 .num_resources = ARRAY_SIZE(smsc911x_resources),
79 .resource = smsc911x_resources,
80 };
81
mxc_expio_irq_handler(struct irq_desc * desc)82 static void mxc_expio_irq_handler(struct irq_desc *desc)
83 {
84 u32 imr_val;
85 u32 int_valid;
86 u32 expio_irq;
87
88 /* irq = gpio irq number */
89 desc->irq_data.chip->irq_mask(&desc->irq_data);
90
91 imr_val = imx_readw(brd_io + INTR_MASK_REG);
92 int_valid = imx_readw(brd_io + INTR_STATUS_REG) & ~imr_val;
93
94 expio_irq = 0;
95 for (; int_valid != 0; int_valid >>= 1, expio_irq++) {
96 if ((int_valid & 1) == 0)
97 continue;
98 generic_handle_irq(irq_find_mapping(domain, expio_irq));
99 }
100
101 desc->irq_data.chip->irq_ack(&desc->irq_data);
102 desc->irq_data.chip->irq_unmask(&desc->irq_data);
103 }
104
105 /*
106 * Disable an expio pin's interrupt by setting the bit in the imr.
107 * Irq is an expio virtual irq number
108 */
expio_mask_irq(struct irq_data * d)109 static void expio_mask_irq(struct irq_data *d)
110 {
111 u16 reg;
112 u32 expio = d->hwirq;
113
114 reg = imx_readw(brd_io + INTR_MASK_REG);
115 reg |= (1 << expio);
116 imx_writew(reg, brd_io + INTR_MASK_REG);
117 }
118
expio_ack_irq(struct irq_data * d)119 static void expio_ack_irq(struct irq_data *d)
120 {
121 u32 expio = d->hwirq;
122
123 imx_writew(1 << expio, brd_io + INTR_RESET_REG);
124 imx_writew(0, brd_io + INTR_RESET_REG);
125 expio_mask_irq(d);
126 }
127
expio_unmask_irq(struct irq_data * d)128 static void expio_unmask_irq(struct irq_data *d)
129 {
130 u16 reg;
131 u32 expio = d->hwirq;
132
133 reg = imx_readw(brd_io + INTR_MASK_REG);
134 reg &= ~(1 << expio);
135 imx_writew(reg, brd_io + INTR_MASK_REG);
136 }
137
138 static struct irq_chip expio_irq_chip = {
139 .irq_ack = expio_ack_irq,
140 .irq_mask = expio_mask_irq,
141 .irq_unmask = expio_unmask_irq,
142 };
143
144 static struct regulator_consumer_supply dummy_supplies[] = {
145 REGULATOR_SUPPLY("vdd33a", "smsc911x"),
146 REGULATOR_SUPPLY("vddvario", "smsc911x"),
147 };
148
mxc_expio_init(u32 base,u32 intr_gpio)149 int __init mxc_expio_init(u32 base, u32 intr_gpio)
150 {
151 u32 p_irq = gpio_to_irq(intr_gpio);
152 int irq_base;
153 int i;
154
155 brd_io = ioremap(BOARD_IO_ADDR(base), SZ_4K);
156 if (brd_io == NULL)
157 return -ENOMEM;
158
159 if ((imx_readw(brd_io + MAGIC_NUMBER1_REG) != 0xAAAA) ||
160 (imx_readw(brd_io + MAGIC_NUMBER2_REG) != 0x5555) ||
161 (imx_readw(brd_io + MAGIC_NUMBER3_REG) != 0xCAFE)) {
162 pr_info("3-Stack Debug board not detected\n");
163 iounmap(brd_io);
164 brd_io = NULL;
165 return -ENODEV;
166 }
167
168 pr_info("3-Stack Debug board detected, rev = 0x%04X\n",
169 readw(brd_io + CPLD_CODE_VER_REG));
170
171 /*
172 * Configure INT line as GPIO input
173 */
174 gpio_request(intr_gpio, "expio_pirq");
175 gpio_direction_input(intr_gpio);
176
177 /* disable the interrupt and clear the status */
178 imx_writew(0, brd_io + INTR_MASK_REG);
179 imx_writew(0xFFFF, brd_io + INTR_RESET_REG);
180 imx_writew(0, brd_io + INTR_RESET_REG);
181 imx_writew(0x1F, brd_io + INTR_MASK_REG);
182
183 irq_base = irq_alloc_descs(-1, 0, MXC_MAX_EXP_IO_LINES, numa_node_id());
184 WARN_ON(irq_base < 0);
185
186 domain = irq_domain_add_legacy(NULL, MXC_MAX_EXP_IO_LINES, irq_base, 0,
187 &irq_domain_simple_ops, NULL);
188 WARN_ON(!domain);
189
190 for (i = irq_base; i < irq_base + MXC_MAX_EXP_IO_LINES; i++) {
191 irq_set_chip_and_handler(i, &expio_irq_chip, handle_level_irq);
192 irq_clear_status_flags(i, IRQ_NOREQUEST);
193 }
194 irq_set_irq_type(p_irq, IRQF_TRIGGER_LOW);
195 irq_set_chained_handler(p_irq, mxc_expio_irq_handler);
196
197 /* Register Lan device on the debugboard */
198 regulator_register_fixed(0, dummy_supplies, ARRAY_SIZE(dummy_supplies));
199
200 smsc911x_resources[0].start = LAN9217_BASE_ADDR(base);
201 smsc911x_resources[0].end = LAN9217_BASE_ADDR(base) + 0x100 - 1;
202 smsc911x_resources[1].start = irq_find_mapping(domain, EXPIO_INT_ENET);
203 smsc911x_resources[1].end = irq_find_mapping(domain, EXPIO_INT_ENET);
204 platform_device_register(&smsc_lan9217_device);
205
206 return 0;
207 }
208
