arch/arm/plat-mxc/3ds_debugboard.c

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