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