diff options
Diffstat (limited to 'arch/arm/plat-mxc/3ds_debugboard.c')
| -rw-r--r-- | arch/arm/plat-mxc/3ds_debugboard.c | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/arch/arm/plat-mxc/3ds_debugboard.c b/arch/arm/plat-mxc/3ds_debugboard.c new file mode 100644 index 000000000000..639c54a07992 --- /dev/null +++ b/arch/arm/plat-mxc/3ds_debugboard.c @@ -0,0 +1,202 @@ +/* + * 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 void expio_ack_irq(u32 irq); + +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; + + desc->chip->mask(irq); /* irq = gpio irq number */ + + 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->chip->ack(irq); + desc->chip->unmask(irq); +} + +/* + * 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(u32 irq) +{ + u16 reg; + u32 expio = MXC_IRQ_TO_EXPIO(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(u32 irq) +{ + u32 expio = MXC_IRQ_TO_EXPIO(irq); + + __raw_writew(1 << expio, brd_io + INTR_RESET_REG); + __raw_writew(0, brd_io + INTR_RESET_REG); + expio_mask_irq(irq); +} + +static void expio_unmask_irq(u32 irq) +{ + u16 reg; + u32 expio = MXC_IRQ_TO_EXPIO(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 = { + .ack = expio_ack_irq, + .mask = expio_mask_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; +} |