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

   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
  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  */
 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
 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
 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
 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 }