--- /dev/null
+/*
+ * 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;
+}
Code Review / kvmfornfv.git / blobdiff