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Linux/arch/arm/mach-imx/3ds_debugboard.c

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  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 
 62 static void __iomem *brd_io;
 63 static struct irq_domain *domain;
 64 
 65 static struct resource smsc911x_resources[] = {
 66         {
 67                 .flags = IORESOURCE_MEM,
 68         } , {
 69                 .flags = IORESOURCE_IRQ,
 70         },
 71 };
 72 
 73 static 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 
 78 static 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 
 88 static void mxc_expio_irq_handler(u32 irq, 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  */
115 static 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 
125 static 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 
134 static 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 
144 static 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 
150 static struct regulator_consumer_supply dummy_supplies[] = {
151         REGULATOR_SUPPLY("vdd33a", "smsc911x"),
152         REGULATOR_SUPPLY("vddvario", "smsc911x"),
153 };
154 
155 int __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                 set_irq_flags(i, IRQF_VALID);
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 

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