/* * 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++) { if ((int_valid & 1) == 0) continue; generic_handle_irq(expio_irq); } 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++) { irq_set_chip_and_handler(i, &expio_irq_chip, handle_level_irq); set_irq_flags(i, IRQF_VALID); } irq_set_irq_type(p_irq, IRQF_TRIGGER_LOW); irq_set_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; }