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mx31pdk.c

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/*
 *  Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/types.h>
#include <linux/init.h>
#include <linux/clk.h>
#include <linux/irq.h>
#include <linux/gpio.h>
#include <linux/smsc911x.h>
#include <linux/platform_device.h>

#include <mach/hardware.h>
#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/mach/time.h>
#include <asm/memory.h>
#include <asm/mach/map.h>
#include <mach/common.h>
#include <mach/board-mx31pdk.h>
#include <mach/imx-uart.h>
#include <mach/iomux-mx3.h>
#include "devices.h"

/*!
 * @file mx31pdk.c
 *
 * @brief This file contains the board-specific initialization routines.
 *
 * @ingroup System
 */

static int mx31pdk_pins[] = {
      /* UART1 */
      MX31_PIN_CTS1__CTS1,
      MX31_PIN_RTS1__RTS1,
      MX31_PIN_TXD1__TXD1,
      MX31_PIN_RXD1__RXD1,
      IOMUX_MODE(MX31_PIN_GPIO1_1, IOMUX_CONFIG_GPIO),
};

static struct imxuart_platform_data uart_pdata = {
      .flags = IMXUART_HAVE_RTSCTS,
};

/*
 * Support for the SMSC9217 on the Debug board.
 */

static struct smsc911x_platform_config smsc911x_config = {
      .irq_polarity     = SMSC911X_IRQ_POLARITY_ACTIVE_LOW,
      .irq_type   = SMSC911X_IRQ_TYPE_PUSH_PULL,
      .flags            = SMSC911X_USE_16BIT | SMSC911X_FORCE_INTERNAL_PHY,
      .phy_interface    = PHY_INTERFACE_MODE_MII,
};

static struct resource smsc911x_resources[] = {
      {
            .start            = LAN9217_BASE_ADDR,
            .end        = LAN9217_BASE_ADDR + 0xff,
            .flags            = IORESOURCE_MEM,
      }, {
            .start            = EXPIO_INT_ENET,
            .end        = EXPIO_INT_ENET,
            .flags            = IORESOURCE_IRQ,
      },
};

static struct platform_device smsc911x_device = {
      .name       = "smsc911x",
      .id         = -1,
      .num_resources    = ARRAY_SIZE(smsc911x_resources),
      .resource   = smsc911x_resources,
      .dev        = {
            .platform_data = &smsc911x_config,
      },
};

/*
 * Routines for the CPLD on the debug board. It contains a CPLD handling
 * LEDs, switches, interrupts for Ethernet.
 */

static void mx31pdk_expio_irq_handler(uint32_t irq, struct irq_desc *desc)
{
      uint32_t imr_val;
      uint32_t int_valid;
      uint32_t expio_irq;

      imr_val = __raw_readw(CPLD_INT_MASK_REG);
      int_valid = __raw_readw(CPLD_INT_STATUS_REG) & ~imr_val;

      expio_irq = MXC_EXP_IO_BASE;
      for (; int_valid != 0; int_valid >>= 1, expio_irq++) {
            if ((int_valid & 1) == 0)
                  continue;
            generic_handle_irq(expio_irq);
      }
}

/*
 * Disable an expio pin's interrupt by setting the bit in the imr.
 * @param irq           an expio virtual irq number
 */
static void expio_mask_irq(uint32_t irq)
{
      uint16_t reg;
      uint32_t expio = MXC_IRQ_TO_EXPIO(irq);

      /* mask the interrupt */
      reg = __raw_readw(CPLD_INT_MASK_REG);
      reg |= 1 << expio;
      __raw_writew(reg, CPLD_INT_MASK_REG);
}

/*
 * Acknowledge an expanded io pin's interrupt by clearing the bit in the isr.
 * @param irq           an expanded io virtual irq number
 */
static void expio_ack_irq(uint32_t irq)
{
      uint32_t expio = MXC_IRQ_TO_EXPIO(irq);

      /* clear the interrupt status */
      __raw_writew(1 << expio, CPLD_INT_RESET_REG);
      __raw_writew(0, CPLD_INT_RESET_REG);
      /* mask the interrupt */
      expio_mask_irq(irq);
}

/*
 * Enable a expio pin's interrupt by clearing the bit in the imr.
 * @param irq           a expio virtual irq number
 */
static void expio_unmask_irq(uint32_t irq)
{
      uint16_t reg;
      uint32_t expio = MXC_IRQ_TO_EXPIO(irq);

      /* unmask the interrupt */
      reg = __raw_readw(CPLD_INT_MASK_REG);
      reg &= ~(1 << expio);
      __raw_writew(reg, CPLD_INT_MASK_REG);
}

static struct irq_chip expio_irq_chip = {
      .ack = expio_ack_irq,
      .mask = expio_mask_irq,
      .unmask = expio_unmask_irq,
};

static int __init mx31pdk_init_expio(void)
{
      int i;
      int ret;

      /* Check if there's a debug board connected */
      if ((__raw_readw(CPLD_MAGIC_NUMBER1_REG) != 0xAAAA) ||
          (__raw_readw(CPLD_MAGIC_NUMBER2_REG) != 0x5555) ||
          (__raw_readw(CPLD_MAGIC_NUMBER3_REG) != 0xCAFE)) {
            /* No Debug board found */
            return -ENODEV;
      }

      pr_info("i.MX31PDK Debug board detected, rev = 0x%04X\n",
            __raw_readw(CPLD_CODE_VER_REG));

      /*
       * Configure INT line as GPIO input
       */
      ret = gpio_request(IOMUX_TO_GPIO(MX31_PIN_GPIO1_1), "sms9217-irq");
      if (ret)
            pr_warning("could not get LAN irq gpio\n");
      else
            gpio_direction_input(IOMUX_TO_GPIO(MX31_PIN_GPIO1_1));

      /* Disable the interrupts and clear the status */
      __raw_writew(0, CPLD_INT_MASK_REG);
      __raw_writew(0xFFFF, CPLD_INT_RESET_REG);
      __raw_writew(0, CPLD_INT_RESET_REG);
      __raw_writew(0x1F, CPLD_INT_MASK_REG);
      for (i = MXC_EXP_IO_BASE;
           i < (MXC_EXP_IO_BASE + MXC_MAX_EXP_IO_LINES);
           i++) {
            set_irq_chip(i, &expio_irq_chip);
            set_irq_handler(i, handle_level_irq);
            set_irq_flags(i, IRQF_VALID);
      }
      set_irq_type(EXPIO_PARENT_INT, IRQ_TYPE_LEVEL_LOW);
      set_irq_chained_handler(EXPIO_PARENT_INT, mx31pdk_expio_irq_handler);

      return 0;
}

/*
 * This structure defines the MX31 memory map.
 */
static struct map_desc mx31pdk_io_desc[] __initdata = {
      {
            .virtual = SPBA0_BASE_ADDR_VIRT,
            .pfn = __phys_to_pfn(SPBA0_BASE_ADDR),
            .length = SPBA0_SIZE,
            .type = MT_DEVICE_NONSHARED,
      }, {
            .virtual = CS5_BASE_ADDR_VIRT,
            .pfn = __phys_to_pfn(CS5_BASE_ADDR),
            .length = CS5_SIZE,
            .type = MT_DEVICE,
      },
};

/*
 * Set up static virtual mappings.
 */
static void __init mx31pdk_map_io(void)
{
      mx31_map_io();
      iotable_init(mx31pdk_io_desc, ARRAY_SIZE(mx31pdk_io_desc));
}

/*!
 * Board specific initialization.
 */
00238 static void __init mxc_board_init(void)
{
      mxc_iomux_setup_multiple_pins(mx31pdk_pins, ARRAY_SIZE(mx31pdk_pins),
                              "mx31pdk");

      mxc_register_device(&mxc_uart_device0, &uart_pdata);

      if (!mx31pdk_init_expio())
            platform_device_register(&smsc911x_device);
}

static void __init mx31pdk_timer_init(void)
{
      mx31_clocks_init(26000000);
}

static struct sys_timer mx31pdk_timer = {
      .init = mx31pdk_timer_init,
};

/*
 * The following uses standard kernel macros defined in arch.h in order to
 * initialize __mach_desc_MX31PDK data structure.
 */
MACHINE_START(MX31_3DS, "Freescale MX31PDK (3DS)")
      /* Maintainer: Freescale Semiconductor, Inc. */
      .phys_io    = AIPS1_BASE_ADDR,
      .io_pg_offst      = ((AIPS1_BASE_ADDR_VIRT) >> 18) & 0xfffc,
      .boot_params    = PHYS_OFFSET + 0x100,
      .map_io         = mx31pdk_map_io,
      .init_irq       = mx31_init_irq,
      .init_machine   = mxc_board_init,
      .timer          = &mx31pdk_timer,
MACHINE_END

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