[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/drivers/gpio/gpio-brcmstb.c b/src/kernel/linux/v4.14/drivers/gpio/gpio-brcmstb.c
new file mode 100644
index 0000000..bfc9b1a
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/gpio/gpio-brcmstb.c
@@ -0,0 +1,563 @@
+/*
+ * Copyright (C) 2015 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/bitops.h>
+#include <linux/gpio/driver.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/module.h>
+#include <linux/irqdomain.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/interrupt.h>
+#include <linux/reboot.h>
+
+#define GIO_BANK_SIZE 0x20
+#define GIO_ODEN(bank) (((bank) * GIO_BANK_SIZE) + 0x00)
+#define GIO_DATA(bank) (((bank) * GIO_BANK_SIZE) + 0x04)
+#define GIO_IODIR(bank) (((bank) * GIO_BANK_SIZE) + 0x08)
+#define GIO_EC(bank) (((bank) * GIO_BANK_SIZE) + 0x0c)
+#define GIO_EI(bank) (((bank) * GIO_BANK_SIZE) + 0x10)
+#define GIO_MASK(bank) (((bank) * GIO_BANK_SIZE) + 0x14)
+#define GIO_LEVEL(bank) (((bank) * GIO_BANK_SIZE) + 0x18)
+#define GIO_STAT(bank) (((bank) * GIO_BANK_SIZE) + 0x1c)
+
+struct brcmstb_gpio_bank {
+ struct list_head node;
+ int id;
+ struct gpio_chip gc;
+ struct brcmstb_gpio_priv *parent_priv;
+ u32 width;
+ struct irq_chip irq_chip;
+};
+
+struct brcmstb_gpio_priv {
+ struct list_head bank_list;
+ void __iomem *reg_base;
+ struct platform_device *pdev;
+ int parent_irq;
+ int gpio_base;
+ bool can_wake;
+ int parent_wake_irq;
+ struct notifier_block reboot_notifier;
+};
+
+#define MAX_GPIO_PER_BANK 32
+#define GPIO_BANK(gpio) ((gpio) >> 5)
+/* assumes MAX_GPIO_PER_BANK is a multiple of 2 */
+#define GPIO_BIT(gpio) ((gpio) & (MAX_GPIO_PER_BANK - 1))
+
+static inline struct brcmstb_gpio_priv *
+brcmstb_gpio_gc_to_priv(struct gpio_chip *gc)
+{
+ struct brcmstb_gpio_bank *bank = gpiochip_get_data(gc);
+ return bank->parent_priv;
+}
+
+static unsigned long
+brcmstb_gpio_get_active_irqs(struct brcmstb_gpio_bank *bank)
+{
+ void __iomem *reg_base = bank->parent_priv->reg_base;
+ unsigned long status;
+ unsigned long flags;
+
+ spin_lock_irqsave(&bank->gc.bgpio_lock, flags);
+ status = bank->gc.read_reg(reg_base + GIO_STAT(bank->id)) &
+ bank->gc.read_reg(reg_base + GIO_MASK(bank->id));
+ spin_unlock_irqrestore(&bank->gc.bgpio_lock, flags);
+
+ return status;
+}
+
+static void brcmstb_gpio_set_imask(struct brcmstb_gpio_bank *bank,
+ unsigned int offset, bool enable)
+{
+ struct gpio_chip *gc = &bank->gc;
+ struct brcmstb_gpio_priv *priv = bank->parent_priv;
+ u32 mask = gc->pin2mask(gc, offset);
+ u32 imask;
+ unsigned long flags;
+
+ spin_lock_irqsave(&gc->bgpio_lock, flags);
+ imask = gc->read_reg(priv->reg_base + GIO_MASK(bank->id));
+ if (enable)
+ imask |= mask;
+ else
+ imask &= ~mask;
+ gc->write_reg(priv->reg_base + GIO_MASK(bank->id), imask);
+ spin_unlock_irqrestore(&gc->bgpio_lock, flags);
+}
+
+/* -------------------- IRQ chip functions -------------------- */
+
+static void brcmstb_gpio_irq_mask(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct brcmstb_gpio_bank *bank = gpiochip_get_data(gc);
+
+ brcmstb_gpio_set_imask(bank, d->hwirq, false);
+}
+
+static void brcmstb_gpio_irq_unmask(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct brcmstb_gpio_bank *bank = gpiochip_get_data(gc);
+
+ brcmstb_gpio_set_imask(bank, d->hwirq, true);
+}
+
+static int brcmstb_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct brcmstb_gpio_bank *bank = gpiochip_get_data(gc);
+ struct brcmstb_gpio_priv *priv = bank->parent_priv;
+ u32 mask = BIT(d->hwirq);
+ u32 edge_insensitive, iedge_insensitive;
+ u32 edge_config, iedge_config;
+ u32 level, ilevel;
+ unsigned long flags;
+
+ switch (type) {
+ case IRQ_TYPE_LEVEL_LOW:
+ level = 0;
+ edge_config = 0;
+ edge_insensitive = 0;
+ break;
+ case IRQ_TYPE_LEVEL_HIGH:
+ level = mask;
+ edge_config = 0;
+ edge_insensitive = 0;
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ level = 0;
+ edge_config = 0;
+ edge_insensitive = 0;
+ break;
+ case IRQ_TYPE_EDGE_RISING:
+ level = 0;
+ edge_config = mask;
+ edge_insensitive = 0;
+ break;
+ case IRQ_TYPE_EDGE_BOTH:
+ level = 0;
+ edge_config = 0; /* don't care, but want known value */
+ edge_insensitive = mask;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(&bank->gc.bgpio_lock, flags);
+
+ iedge_config = bank->gc.read_reg(priv->reg_base +
+ GIO_EC(bank->id)) & ~mask;
+ iedge_insensitive = bank->gc.read_reg(priv->reg_base +
+ GIO_EI(bank->id)) & ~mask;
+ ilevel = bank->gc.read_reg(priv->reg_base +
+ GIO_LEVEL(bank->id)) & ~mask;
+
+ bank->gc.write_reg(priv->reg_base + GIO_EC(bank->id),
+ iedge_config | edge_config);
+ bank->gc.write_reg(priv->reg_base + GIO_EI(bank->id),
+ iedge_insensitive | edge_insensitive);
+ bank->gc.write_reg(priv->reg_base + GIO_LEVEL(bank->id),
+ ilevel | level);
+
+ spin_unlock_irqrestore(&bank->gc.bgpio_lock, flags);
+ return 0;
+}
+
+static int brcmstb_gpio_priv_set_wake(struct brcmstb_gpio_priv *priv,
+ unsigned int enable)
+{
+ int ret = 0;
+
+ /*
+ * Only enable wake IRQ once for however many hwirqs can wake
+ * since they all use the same wake IRQ. Mask will be set
+ * up appropriately thanks to IRQCHIP_MASK_ON_SUSPEND flag.
+ */
+ if (enable)
+ ret = enable_irq_wake(priv->parent_wake_irq);
+ else
+ ret = disable_irq_wake(priv->parent_wake_irq);
+ if (ret)
+ dev_err(&priv->pdev->dev, "failed to %s wake-up interrupt\n",
+ enable ? "enable" : "disable");
+ return ret;
+}
+
+static int brcmstb_gpio_irq_set_wake(struct irq_data *d, unsigned int enable)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct brcmstb_gpio_priv *priv = brcmstb_gpio_gc_to_priv(gc);
+
+ return brcmstb_gpio_priv_set_wake(priv, enable);
+}
+
+static irqreturn_t brcmstb_gpio_wake_irq_handler(int irq, void *data)
+{
+ struct brcmstb_gpio_priv *priv = data;
+
+ if (!priv || irq != priv->parent_wake_irq)
+ return IRQ_NONE;
+ pm_wakeup_event(&priv->pdev->dev, 0);
+ return IRQ_HANDLED;
+}
+
+static void brcmstb_gpio_irq_bank_handler(struct brcmstb_gpio_bank *bank)
+{
+ struct brcmstb_gpio_priv *priv = bank->parent_priv;
+ struct irq_domain *irq_domain = bank->gc.irqdomain;
+ void __iomem *reg_base = priv->reg_base;
+ unsigned long status;
+
+ while ((status = brcmstb_gpio_get_active_irqs(bank))) {
+ int bit;
+
+ for_each_set_bit(bit, &status, 32) {
+ u32 stat = bank->gc.read_reg(reg_base +
+ GIO_STAT(bank->id));
+ if (bit >= bank->width)
+ dev_warn(&priv->pdev->dev,
+ "IRQ for invalid GPIO (bank=%d, offset=%d)\n",
+ bank->id, bit);
+ bank->gc.write_reg(reg_base + GIO_STAT(bank->id),
+ stat | BIT(bit));
+ generic_handle_irq(irq_find_mapping(irq_domain, bit));
+ }
+ }
+}
+
+/* Each UPG GIO block has one IRQ for all banks */
+static void brcmstb_gpio_irq_handler(struct irq_desc *desc)
+{
+ struct gpio_chip *gc = irq_desc_get_handler_data(desc);
+ struct brcmstb_gpio_priv *priv = brcmstb_gpio_gc_to_priv(gc);
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+ struct brcmstb_gpio_bank *bank;
+
+ /* Interrupts weren't properly cleared during probe */
+ BUG_ON(!priv || !chip);
+
+ chained_irq_enter(chip, desc);
+ list_for_each_entry(bank, &priv->bank_list, node)
+ brcmstb_gpio_irq_bank_handler(bank);
+ chained_irq_exit(chip, desc);
+}
+
+static int brcmstb_gpio_reboot(struct notifier_block *nb,
+ unsigned long action, void *data)
+{
+ struct brcmstb_gpio_priv *priv =
+ container_of(nb, struct brcmstb_gpio_priv, reboot_notifier);
+
+ /* Enable GPIO for S5 cold boot */
+ if (action == SYS_POWER_OFF)
+ brcmstb_gpio_priv_set_wake(priv, 1);
+
+ return NOTIFY_DONE;
+}
+
+/* Make sure that the number of banks matches up between properties */
+static int brcmstb_gpio_sanity_check_banks(struct device *dev,
+ struct device_node *np, struct resource *res)
+{
+ int res_num_banks = resource_size(res) / GIO_BANK_SIZE;
+ int num_banks =
+ of_property_count_u32_elems(np, "brcm,gpio-bank-widths");
+
+ if (res_num_banks != num_banks) {
+ dev_err(dev, "Mismatch in banks: res had %d, bank-widths had %d\n",
+ res_num_banks, num_banks);
+ return -EINVAL;
+ } else {
+ return 0;
+ }
+}
+
+static int brcmstb_gpio_remove(struct platform_device *pdev)
+{
+ struct brcmstb_gpio_priv *priv = platform_get_drvdata(pdev);
+ struct brcmstb_gpio_bank *bank;
+ int ret = 0;
+
+ if (!priv) {
+ dev_err(&pdev->dev, "called %s without drvdata!\n", __func__);
+ return -EFAULT;
+ }
+
+ /*
+ * You can lose return values below, but we report all errors, and it's
+ * more important to actually perform all of the steps.
+ */
+ list_for_each_entry(bank, &priv->bank_list, node)
+ gpiochip_remove(&bank->gc);
+
+ if (priv->reboot_notifier.notifier_call) {
+ ret = unregister_reboot_notifier(&priv->reboot_notifier);
+ if (ret)
+ dev_err(&pdev->dev,
+ "failed to unregister reboot notifier\n");
+ }
+ return ret;
+}
+
+static int brcmstb_gpio_of_xlate(struct gpio_chip *gc,
+ const struct of_phandle_args *gpiospec, u32 *flags)
+{
+ struct brcmstb_gpio_priv *priv = brcmstb_gpio_gc_to_priv(gc);
+ struct brcmstb_gpio_bank *bank = gpiochip_get_data(gc);
+ int offset;
+
+ if (gc->of_gpio_n_cells != 2) {
+ WARN_ON(1);
+ return -EINVAL;
+ }
+
+ if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
+ return -EINVAL;
+
+ offset = gpiospec->args[0] - (gc->base - priv->gpio_base);
+ if (offset >= gc->ngpio || offset < 0)
+ return -EINVAL;
+
+ if (unlikely(offset >= bank->width)) {
+ dev_warn_ratelimited(&priv->pdev->dev,
+ "Received request for invalid GPIO offset %d\n",
+ gpiospec->args[0]);
+ }
+
+ if (flags)
+ *flags = gpiospec->args[1];
+
+ return offset;
+}
+
+/* Before calling, must have bank->parent_irq set and gpiochip registered */
+static int brcmstb_gpio_irq_setup(struct platform_device *pdev,
+ struct brcmstb_gpio_bank *bank)
+{
+ struct brcmstb_gpio_priv *priv = bank->parent_priv;
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ int err;
+
+ bank->irq_chip.name = dev_name(dev);
+ bank->irq_chip.irq_mask = brcmstb_gpio_irq_mask;
+ bank->irq_chip.irq_unmask = brcmstb_gpio_irq_unmask;
+ bank->irq_chip.irq_set_type = brcmstb_gpio_irq_set_type;
+
+ /* Ensures that all non-wakeup IRQs are disabled at suspend */
+ bank->irq_chip.flags = IRQCHIP_MASK_ON_SUSPEND;
+
+ if (IS_ENABLED(CONFIG_PM_SLEEP) && !priv->can_wake &&
+ of_property_read_bool(np, "wakeup-source")) {
+ priv->parent_wake_irq = platform_get_irq(pdev, 1);
+ if (priv->parent_wake_irq < 0) {
+ dev_warn(dev,
+ "Couldn't get wake IRQ - GPIOs will not be able to wake from sleep");
+ } else {
+ /*
+ * Set wakeup capability before requesting wakeup
+ * interrupt, so we can process boot-time "wakeups"
+ * (e.g., from S5 cold boot)
+ */
+ device_set_wakeup_capable(dev, true);
+ device_wakeup_enable(dev);
+ err = devm_request_irq(dev, priv->parent_wake_irq,
+ brcmstb_gpio_wake_irq_handler, 0,
+ "brcmstb-gpio-wake", priv);
+
+ if (err < 0) {
+ dev_err(dev, "Couldn't request wake IRQ");
+ return err;
+ }
+
+ priv->reboot_notifier.notifier_call =
+ brcmstb_gpio_reboot;
+ register_reboot_notifier(&priv->reboot_notifier);
+ priv->can_wake = true;
+ }
+ }
+
+ if (priv->can_wake)
+ bank->irq_chip.irq_set_wake = brcmstb_gpio_irq_set_wake;
+
+ err = gpiochip_irqchip_add(&bank->gc, &bank->irq_chip, 0,
+ handle_simple_irq, IRQ_TYPE_NONE);
+ if (err)
+ return err;
+ gpiochip_set_chained_irqchip(&bank->gc, &bank->irq_chip,
+ priv->parent_irq, brcmstb_gpio_irq_handler);
+
+ return 0;
+}
+
+static int brcmstb_gpio_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ void __iomem *reg_base;
+ struct brcmstb_gpio_priv *priv;
+ struct resource *res;
+ struct property *prop;
+ const __be32 *p;
+ u32 bank_width;
+ int num_banks = 0;
+ int err;
+ static int gpio_base;
+ unsigned long flags = 0;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+ platform_set_drvdata(pdev, priv);
+ INIT_LIST_HEAD(&priv->bank_list);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ reg_base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(reg_base))
+ return PTR_ERR(reg_base);
+
+ priv->gpio_base = gpio_base;
+ priv->reg_base = reg_base;
+ priv->pdev = pdev;
+
+ if (of_property_read_bool(np, "interrupt-controller")) {
+ priv->parent_irq = platform_get_irq(pdev, 0);
+ if (priv->parent_irq <= 0) {
+ dev_err(dev, "Couldn't get IRQ");
+ return -ENOENT;
+ }
+ } else {
+ priv->parent_irq = -ENOENT;
+ }
+
+ if (brcmstb_gpio_sanity_check_banks(dev, np, res))
+ return -EINVAL;
+
+ /*
+ * MIPS endianness is configured by boot strap, which also reverses all
+ * bus endianness (i.e., big-endian CPU + big endian bus ==> native
+ * endian I/O).
+ *
+ * Other architectures (e.g., ARM) either do not support big endian, or
+ * else leave I/O in little endian mode.
+ */
+#if defined(CONFIG_MIPS) && defined(__BIG_ENDIAN)
+ flags = BGPIOF_BIG_ENDIAN_BYTE_ORDER;
+#endif
+
+ of_property_for_each_u32(np, "brcm,gpio-bank-widths", prop, p,
+ bank_width) {
+ struct brcmstb_gpio_bank *bank;
+ struct gpio_chip *gc;
+
+ bank = devm_kzalloc(dev, sizeof(*bank), GFP_KERNEL);
+ if (!bank) {
+ err = -ENOMEM;
+ goto fail;
+ }
+
+ bank->parent_priv = priv;
+ bank->id = num_banks;
+ if (bank_width <= 0 || bank_width > MAX_GPIO_PER_BANK) {
+ dev_err(dev, "Invalid bank width %d\n", bank_width);
+ err = -EINVAL;
+ goto fail;
+ } else {
+ bank->width = bank_width;
+ }
+
+ /*
+ * Regs are 4 bytes wide, have data reg, no set/clear regs,
+ * and direction bits have 0 = output and 1 = input
+ */
+ gc = &bank->gc;
+ err = bgpio_init(gc, dev, 4,
+ reg_base + GIO_DATA(bank->id),
+ NULL, NULL, NULL,
+ reg_base + GIO_IODIR(bank->id), flags);
+ if (err) {
+ dev_err(dev, "bgpio_init() failed\n");
+ goto fail;
+ }
+
+ gc->of_node = np;
+ gc->owner = THIS_MODULE;
+ gc->label = devm_kasprintf(dev, GFP_KERNEL, "%pOF", dev->of_node);
+ gc->base = gpio_base;
+ gc->of_gpio_n_cells = 2;
+ gc->of_xlate = brcmstb_gpio_of_xlate;
+ /* not all ngpio lines are valid, will use bank width later */
+ gc->ngpio = MAX_GPIO_PER_BANK;
+
+ /*
+ * Mask all interrupts by default, since wakeup interrupts may
+ * be retained from S5 cold boot
+ */
+ gc->write_reg(reg_base + GIO_MASK(bank->id), 0);
+
+ err = gpiochip_add_data(gc, bank);
+ if (err) {
+ dev_err(dev, "Could not add gpiochip for bank %d\n",
+ bank->id);
+ goto fail;
+ }
+ gpio_base += gc->ngpio;
+
+ if (priv->parent_irq > 0) {
+ err = brcmstb_gpio_irq_setup(pdev, bank);
+ if (err)
+ goto fail;
+ }
+
+ dev_dbg(dev, "bank=%d, base=%d, ngpio=%d, width=%d\n", bank->id,
+ gc->base, gc->ngpio, bank->width);
+
+ /* Everything looks good, so add bank to list */
+ list_add(&bank->node, &priv->bank_list);
+
+ num_banks++;
+ }
+
+ dev_info(dev, "Registered %d banks (GPIO(s): %d-%d)\n",
+ num_banks, priv->gpio_base, gpio_base - 1);
+
+ return 0;
+
+fail:
+ (void) brcmstb_gpio_remove(pdev);
+ return err;
+}
+
+static const struct of_device_id brcmstb_gpio_of_match[] = {
+ { .compatible = "brcm,brcmstb-gpio" },
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, brcmstb_gpio_of_match);
+
+static struct platform_driver brcmstb_gpio_driver = {
+ .driver = {
+ .name = "brcmstb-gpio",
+ .of_match_table = brcmstb_gpio_of_match,
+ },
+ .probe = brcmstb_gpio_probe,
+ .remove = brcmstb_gpio_remove,
+};
+module_platform_driver(brcmstb_gpio_driver);
+
+MODULE_AUTHOR("Gregory Fong");
+MODULE_DESCRIPTION("Driver for Broadcom BRCMSTB SoC UPG GPIO");
+MODULE_LICENSE("GPL v2");