diff options
Diffstat (limited to 'kernel/arch/arm/mach-imx/3ds_debugboard.c')
| -rw-r--r-- | kernel/arch/arm/mach-imx/3ds_debugboard.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/kernel/arch/arm/mach-imx/3ds_debugboard.c b/kernel/arch/arm/mach-imx/3ds_debugboard.c new file mode 100644 index 000000000..134377352 --- /dev/null +++ b/kernel/arch/arm/mach-imx/3ds_debugboard.c @@ -0,0 +1,213 @@ +/* + * 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/irqdomain.h> +#include <linux/io.h> +#include <linux/platform_device.h> +#include <linux/gpio.h> +#include <linux/module.h> +#include <linux/smsc911x.h> +#include <linux/regulator/machine.h> +#include <linux/regulator/fixed.h> + +#include "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_MAX_EXP_IO_LINES 16 + +/* interrupts like external uart , external ethernet etc*/ +#define EXPIO_INT_ENET 0 +#define EXPIO_INT_XUART_A 1 +#define EXPIO_INT_XUART_B 2 +#define EXPIO_INT_BUTTON_A 3 +#define EXPIO_INT_BUTTON_B 4 + +static void __iomem *brd_io; +static struct irq_domain *domain; + +static struct resource smsc911x_resources[] = { + { + .flags = IORESOURCE_MEM, + } , { + .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 = -1, + .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 = 0; + for (; int_valid != 0; int_valid >>= 1, expio_irq++) { + if ((int_valid & 1) == 0) + continue; + generic_handle_irq(irq_find_mapping(domain, 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 = d->hwirq; + + 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 = d->hwirq; + + __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 = d->hwirq; + + 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, +}; + +static struct regulator_consumer_supply dummy_supplies[] = { + REGULATOR_SUPPLY("vdd33a", "smsc911x"), + REGULATOR_SUPPLY("vddvario", "smsc911x"), +}; + +int __init mxc_expio_init(u32 base, u32 intr_gpio) +{ + u32 p_irq = gpio_to_irq(intr_gpio); + int irq_base; + 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(intr_gpio, "expio_pirq"); + gpio_direction_input(intr_gpio); + + /* 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); + + irq_base = irq_alloc_descs(-1, 0, MXC_MAX_EXP_IO_LINES, numa_node_id()); + WARN_ON(irq_base < 0); + + domain = irq_domain_add_legacy(NULL, MXC_MAX_EXP_IO_LINES, irq_base, 0, + &irq_domain_simple_ops, NULL); + WARN_ON(!domain); + + for (i = irq_base; i < irq_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 */ + regulator_register_fixed(0, dummy_supplies, ARRAY_SIZE(dummy_supplies)); + + smsc911x_resources[0].start = LAN9217_BASE_ADDR(base); + smsc911x_resources[0].end = LAN9217_BASE_ADDR(base) + 0x100 - 1; + smsc911x_resources[1].start = irq_find_mapping(domain, EXPIO_INT_ENET); + smsc911x_resources[1].end = irq_find_mapping(domain, EXPIO_INT_ENET); + platform_device_register(&smsc_lan9217_device); + + return 0; +} |