/*
* Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
* Copyright (C) 2010 Jason Wang <jason77.wang@gmail.com>
*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/smsc911x.h>
#include <mach/hardware.h>
/* LAN9217 ethernet base address */
#define LAN9217_BASE_ADDR(n) (n + 0x0)
/* External UART */
#define UARTA_BASE_ADDR(n) (n + 0x8000)
#define UARTB_BASE_ADDR(n) (n + 0x10000)
#define BOARD_IO_ADDR(n) (n + 0x20000)
/* LED switchs */
#define LED_SWITCH_REG 0x00
/* buttons */
#define SWITCH_BUTTONS_REG 0x08
/* status, interrupt */
#define INTR_STATUS_REG 0x10
#define INTR_MASK_REG 0x38
#define INTR_RESET_REG 0x20
/* magic word for debug CPLD */
#define MAGIC_NUMBER1_REG 0x40
#define MAGIC_NUMBER2_REG 0x48
/* CPLD code version */
#define CPLD_CODE_VER_REG 0x50
/* magic word for debug CPLD */
#define MAGIC_NUMBER3_REG 0x58
/* module reset register*/
#define MODULE_RESET_REG 0x60
/* CPU ID and Personality ID */
#define MCU_BOARD_ID_REG 0x68
#define MXC_IRQ_TO_EXPIO(irq) ((irq) - MXC_BOARD_IRQ_START)
#define MXC_IRQ_TO_GPIO(irq) ((irq) - MXC_INTERNAL_IRQS)
#define MXC_EXP_IO_BASE (MXC_BOARD_IRQ_START)
#define MXC_MAX_EXP_IO_LINES 16
/* interrupts like external uart , external ethernet etc*/
#define EXPIO_INT_ENET (MXC_BOARD_IRQ_START + 0)
#define EXPIO_INT_XUART_A (MXC_BOARD_IRQ_START + 1)
#define EXPIO_INT_XUART_B (MXC_BOARD_IRQ_START + 2)
#define EXPIO_INT_BUTTON_A (MXC_BOARD_IRQ_START + 3)
#define EXPIO_INT_BUTTON_B (MXC_BOARD_IRQ_START + 4)
static void __iomem *brd_io;
static struct resource smsc911x_resources[] = {
{
.flags = IORESOURCE_MEM,
} , {
.start = EXPIO_INT_ENET,
.end = EXPIO_INT_ENET,
.flags = IORESOURCE_IRQ,
},
};
static struct smsc911x_platform_config smsc911x_config = {
.irq_polarity = SMSC911X_IRQ_POLARITY_ACTIVE_LOW,
.flags = SMSC911X_USE_32BIT | SMSC911X_FORCE_INTERNAL_PHY,
};
static struct platform_device smsc_lan9217_device = {
.name = "smsc911x",
.id = 0,
.dev = {
.platform_data = &smsc911x_config,
},
.num_resources = ARRAY_SIZE(smsc911x_resources),
.resource = smsc911x_resources,
};
static void mxc_expio_irq_handler(u32 irq, struct irq_desc *desc)
{
u32 imr_val;
u32 int_valid;
u32 expio_irq;
/* irq = gpio irq number */
desc->irq_data.chip->irq_mask(&desc->irq_data);
imr_val = __raw_readw(brd_io + INTR_MASK_REG);
int_valid = __raw_readw(brd_io + INTR_STATUS_REG) & ~imr_val;
expio_irq = MXC_BOARD_IRQ_START;
for (; int_valid != 0; int_valid >>= 1, expio_irq++) {
struct irq_desc *d;
if ((int_valid & 1) == 0)
continue;
d = irq_desc + expio_irq;
if (unlikely(!(d->handle_irq)))
pr_err("\nEXPIO irq: %d unhandled\n", expio_irq);
else
d->handle_irq(expio_irq, d);
}
desc->irq_data.chip->irq_ack(&desc->irq_data);
desc->irq_data.chip->irq_unmask(&desc->irq_data);
}
/*
* Disable an expio pin's interrupt by setting the bit in the imr.
* Irq is an expio virtual irq number
*/
static void expio_mask_irq(struct irq_data *d)
{
u16 reg;
u32 expio = MXC_IRQ_TO_EXPIO(d->irq);
reg = __raw_readw(brd_io + INTR_MASK_REG);
reg |= (1 << expio);
__raw_writew(reg, brd_io + INTR_MASK_REG);
}
static void expio_ack_irq(struct irq_data *d)
{
u32 expio = MXC_IRQ_TO_EXPIO(d->irq);
__raw_writew(1 << expio, brd_io + INTR_RESET_REG);
__raw_writew(0, brd_io + INTR_RESET_REG);
expio_mask_irq(d);
}
static void expio_unmask_irq(struct irq_data *d)
{
u16 reg;
u32 expio = MXC_IRQ_TO_EXPIO(d->irq);
reg = __raw_readw(brd_io + INTR_MASK_REG);
reg &= ~(1 << expio);
__raw_writew(reg, brd_io + INTR_MASK_REG);
}
static struct irq_chip expio_irq_chip = {
.irq_ack = expio_ack_irq,
.irq_mask = expio_mask_irq,
.irq_unmask = expio_unmask_irq,
};
int __init mxc_expio_init(u32 base, u32 p_irq)
{
int i;
brd_io = ioremap(BOARD_IO_ADDR(base), SZ_4K);
if (brd_io == NULL)
return -ENOMEM;
if ((__raw_readw(brd_io + MAGIC_NUMBER1_REG) != 0xAAAA) ||
(__raw_readw(brd_io + MAGIC_NUMBER2_REG) != 0x5555) ||
(__raw_readw(brd_io + MAGIC_NUMBER3_REG) != 0xCAFE)) {
pr_info("3-Stack Debug board not detected\n");
iounmap(brd_io);
brd_io = NULL;
return -ENODEV;
}
pr_info("3-Stack Debug board detected, rev = 0x%04X\n",
readw(brd_io + CPLD_CODE_VER_REG));
/*
* Configure INT line as GPIO input
*/
gpio_request(MXC_IRQ_TO_GPIO(p_irq), "expio_pirq");
gpio_direction_input(MXC_IRQ_TO_GPIO(p_irq));
/* disable the interrupt and clear the status */
__raw_writew(0, brd_io + INTR_MASK_REG);
__raw_writew(0xFFFF, brd_io + INTR_RESET_REG);
__raw_writew(0, brd_io + INTR_RESET_REG);
__raw_writew(0x1F, brd_io + INTR_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(p_irq, IRQF_TRIGGER_LOW);
set_irq_chained_handler(p_irq, mxc_expio_irq_handler);
/* Register Lan device on the debugboard */
smsc911x_resources[0].start = LAN9217_BASE_ADDR(base);
smsc911x_resources[0].end = LAN9217_BASE_ADDR(base) + 0x100 - 1;
platform_device_register(&smsc_lan9217_device);
return 0;
}
