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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 <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,
};
/*
* 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.
*/
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);
mx31pdk_init_expio();
}
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 = mxc_init_irq,
.init_machine = mxc_board_init,
.timer = &mx31pdk_timer,
MACHINE_END
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