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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
* Copyright (C) 2010 Jason Wang <jason77.wang@gmail.com>
*/
#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 "3ds_debugboard.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(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 = imx_readw(brd_io + INTR_MASK_REG);
int_valid = imx_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 = imx_readw(brd_io + INTR_MASK_REG);
reg |= (1 << expio);
imx_writew(reg, brd_io + INTR_MASK_REG);
}
static void expio_ack_irq(struct irq_data *d)
{
u32 expio = d->hwirq;
imx_writew(1 << expio, brd_io + INTR_RESET_REG);
imx_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 = imx_readw(brd_io + INTR_MASK_REG);
reg &= ~(1 << expio);
imx_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 ((imx_readw(brd_io + MAGIC_NUMBER1_REG) != 0xAAAA) ||
(imx_readw(brd_io + MAGIC_NUMBER2_REG) != 0x5555) ||
(imx_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 */
imx_writew(0, brd_io + INTR_MASK_REG);
imx_writew(0xFFFF, brd_io + INTR_RESET_REG);
imx_writew(0, brd_io + INTR_RESET_REG);
imx_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);
irq_clear_status_flags(i, IRQ_NOREQUEST);
}
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;
}
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