--- /dev/null
-static void uniphier_gpio_irq_domain_activate(struct irq_domain *domain,
- struct irq_data *data)
+ /*
+ * Copyright (C) 2017 Socionext Inc.
+ * Author: Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; 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/irq.h>
+ #include <linux/irqdomain.h>
+ #include <linux/module.h>
+ #include <linux/of.h>
+ #include <linux/of_device.h>
+ #include <linux/of_irq.h>
+ #include <linux/platform_device.h>
+ #include <linux/spinlock.h>
+ #include <dt-bindings/gpio/uniphier-gpio.h>
+
+ #define UNIPHIER_GPIO_BANK_MASK \
+ GENMASK((UNIPHIER_GPIO_LINES_PER_BANK) - 1, 0)
+
+ #define UNIPHIER_GPIO_IRQ_MAX_NUM 24
+
+ #define UNIPHIER_GPIO_PORT_DATA 0x0 /* data */
+ #define UNIPHIER_GPIO_PORT_DIR 0x4 /* direction (1:in, 0:out) */
+ #define UNIPHIER_GPIO_IRQ_EN 0x90 /* irq enable */
+ #define UNIPHIER_GPIO_IRQ_MODE 0x94 /* irq mode (1: both edge) */
+ #define UNIPHIER_GPIO_IRQ_FLT_EN 0x98 /* noise filter enable */
+ #define UNIPHIER_GPIO_IRQ_FLT_CYC 0x9c /* noise filter clock cycle */
+
+ struct uniphier_gpio_priv {
+ struct gpio_chip chip;
+ struct irq_chip irq_chip;
+ struct irq_domain *domain;
+ void __iomem *regs;
+ spinlock_t lock;
+ u32 saved_vals[0];
+ };
+
+ static unsigned int uniphier_gpio_bank_to_reg(unsigned int bank)
+ {
+ unsigned int reg;
+
+ reg = (bank + 1) * 8;
+
+ /*
+ * Unfortunately, the GPIO port registers are not contiguous because
+ * offset 0x90-0x9f is used for IRQ. Add 0x10 when crossing the region.
+ */
+ if (reg >= UNIPHIER_GPIO_IRQ_EN)
+ reg += 0x10;
+
+ return reg;
+ }
+
+ static void uniphier_gpio_get_bank_and_mask(unsigned int offset,
+ unsigned int *bank, u32 *mask)
+ {
+ *bank = offset / UNIPHIER_GPIO_LINES_PER_BANK;
+ *mask = BIT(offset % UNIPHIER_GPIO_LINES_PER_BANK);
+ }
+
+ static void uniphier_gpio_reg_update(struct uniphier_gpio_priv *priv,
+ unsigned int reg, u32 mask, u32 val)
+ {
+ unsigned long flags;
+ u32 tmp;
+
+ spin_lock_irqsave(&priv->lock, flags);
+ tmp = readl(priv->regs + reg);
+ tmp &= ~mask;
+ tmp |= mask & val;
+ writel(tmp, priv->regs + reg);
+ spin_unlock_irqrestore(&priv->lock, flags);
+ }
+
+ static void uniphier_gpio_bank_write(struct gpio_chip *chip, unsigned int bank,
+ unsigned int reg, u32 mask, u32 val)
+ {
+ struct uniphier_gpio_priv *priv = gpiochip_get_data(chip);
+
+ if (!mask)
+ return;
+
+ uniphier_gpio_reg_update(priv, uniphier_gpio_bank_to_reg(bank) + reg,
+ mask, val);
+ }
+
+ static void uniphier_gpio_offset_write(struct gpio_chip *chip,
+ unsigned int offset, unsigned int reg,
+ int val)
+ {
+ unsigned int bank;
+ u32 mask;
+
+ uniphier_gpio_get_bank_and_mask(offset, &bank, &mask);
+
+ uniphier_gpio_bank_write(chip, bank, reg, mask, val ? mask : 0);
+ }
+
+ static int uniphier_gpio_offset_read(struct gpio_chip *chip,
+ unsigned int offset, unsigned int reg)
+ {
+ struct uniphier_gpio_priv *priv = gpiochip_get_data(chip);
+ unsigned int bank, reg_offset;
+ u32 mask;
+
+ uniphier_gpio_get_bank_and_mask(offset, &bank, &mask);
+ reg_offset = uniphier_gpio_bank_to_reg(bank) + reg;
+
+ return !!(readl(priv->regs + reg_offset) & mask);
+ }
+
+ static int uniphier_gpio_get_direction(struct gpio_chip *chip,
+ unsigned int offset)
+ {
+ return uniphier_gpio_offset_read(chip, offset, UNIPHIER_GPIO_PORT_DIR);
+ }
+
+ static int uniphier_gpio_direction_input(struct gpio_chip *chip,
+ unsigned int offset)
+ {
+ uniphier_gpio_offset_write(chip, offset, UNIPHIER_GPIO_PORT_DIR, 1);
+
+ return 0;
+ }
+
+ static int uniphier_gpio_direction_output(struct gpio_chip *chip,
+ unsigned int offset, int val)
+ {
+ uniphier_gpio_offset_write(chip, offset, UNIPHIER_GPIO_PORT_DATA, val);
+ uniphier_gpio_offset_write(chip, offset, UNIPHIER_GPIO_PORT_DIR, 0);
+
+ return 0;
+ }
+
+ static int uniphier_gpio_get(struct gpio_chip *chip, unsigned int offset)
+ {
+ return uniphier_gpio_offset_read(chip, offset, UNIPHIER_GPIO_PORT_DATA);
+ }
+
+ static void uniphier_gpio_set(struct gpio_chip *chip,
+ unsigned int offset, int val)
+ {
+ uniphier_gpio_offset_write(chip, offset, UNIPHIER_GPIO_PORT_DATA, val);
+ }
+
+ static void uniphier_gpio_set_multiple(struct gpio_chip *chip,
+ unsigned long *mask, unsigned long *bits)
+ {
+ unsigned int bank, shift, bank_mask, bank_bits;
+ int i;
+
+ for (i = 0; i < chip->ngpio; i += UNIPHIER_GPIO_LINES_PER_BANK) {
+ bank = i / UNIPHIER_GPIO_LINES_PER_BANK;
+ shift = i % BITS_PER_LONG;
+ bank_mask = (mask[BIT_WORD(i)] >> shift) &
+ UNIPHIER_GPIO_BANK_MASK;
+ bank_bits = bits[BIT_WORD(i)] >> shift;
+
+ uniphier_gpio_bank_write(chip, bank, UNIPHIER_GPIO_PORT_DATA,
+ bank_mask, bank_bits);
+ }
+ }
+
+ static int uniphier_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
+ {
+ struct irq_fwspec fwspec;
+
+ if (offset < UNIPHIER_GPIO_IRQ_OFFSET)
+ return -ENXIO;
+
+ fwspec.fwnode = of_node_to_fwnode(chip->parent->of_node);
+ fwspec.param_count = 2;
+ fwspec.param[0] = offset - UNIPHIER_GPIO_IRQ_OFFSET;
+ fwspec.param[1] = IRQ_TYPE_NONE;
+
+ return irq_create_fwspec_mapping(&fwspec);
+ }
+
+ static void uniphier_gpio_irq_mask(struct irq_data *data)
+ {
+ struct uniphier_gpio_priv *priv = data->chip_data;
+ u32 mask = BIT(data->hwirq);
+
+ uniphier_gpio_reg_update(priv, UNIPHIER_GPIO_IRQ_EN, mask, 0);
+
+ return irq_chip_mask_parent(data);
+ }
+
+ static void uniphier_gpio_irq_unmask(struct irq_data *data)
+ {
+ struct uniphier_gpio_priv *priv = data->chip_data;
+ u32 mask = BIT(data->hwirq);
+
+ uniphier_gpio_reg_update(priv, UNIPHIER_GPIO_IRQ_EN, mask, mask);
+
+ return irq_chip_unmask_parent(data);
+ }
+
+ static int uniphier_gpio_irq_set_type(struct irq_data *data, unsigned int type)
+ {
+ struct uniphier_gpio_priv *priv = data->chip_data;
+ u32 mask = BIT(data->hwirq);
+ u32 val = 0;
+
+ if (type == IRQ_TYPE_EDGE_BOTH) {
+ val = mask;
+ type = IRQ_TYPE_EDGE_FALLING;
+ }
+
+ uniphier_gpio_reg_update(priv, UNIPHIER_GPIO_IRQ_MODE, mask, val);
+ /* To enable both edge detection, the noise filter must be enabled. */
+ uniphier_gpio_reg_update(priv, UNIPHIER_GPIO_IRQ_FLT_EN, mask, val);
+
+ return irq_chip_set_type_parent(data, type);
+ }
+
+ static int uniphier_gpio_irq_get_parent_hwirq(struct uniphier_gpio_priv *priv,
+ unsigned int hwirq)
+ {
+ struct device_node *np = priv->chip.parent->of_node;
+ const __be32 *range;
+ u32 base, parent_base, size;
+ int len;
+
+ range = of_get_property(np, "socionext,interrupt-ranges", &len);
+ if (!range)
+ return -EINVAL;
+
+ len /= sizeof(*range);
+
+ for (; len >= 3; len -= 3) {
+ base = be32_to_cpu(*range++);
+ parent_base = be32_to_cpu(*range++);
+ size = be32_to_cpu(*range++);
+
+ if (base <= hwirq && hwirq < base + size)
+ return hwirq - base + parent_base;
+ }
+
+ return -ENOENT;
+ }
+
+ static int uniphier_gpio_irq_domain_translate(struct irq_domain *domain,
+ struct irq_fwspec *fwspec,
+ unsigned long *out_hwirq,
+ unsigned int *out_type)
+ {
+ if (WARN_ON(fwspec->param_count < 2))
+ return -EINVAL;
+
+ *out_hwirq = fwspec->param[0];
+ *out_type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
+
+ return 0;
+ }
+
+ static int uniphier_gpio_irq_domain_alloc(struct irq_domain *domain,
+ unsigned int virq,
+ unsigned int nr_irqs, void *arg)
+ {
+ struct uniphier_gpio_priv *priv = domain->host_data;
+ struct irq_fwspec parent_fwspec;
+ irq_hw_number_t hwirq;
+ unsigned int type;
+ int ret;
+
+ if (WARN_ON(nr_irqs != 1))
+ return -EINVAL;
+
+ ret = uniphier_gpio_irq_domain_translate(domain, arg, &hwirq, &type);
+ if (ret)
+ return ret;
+
+ ret = uniphier_gpio_irq_get_parent_hwirq(priv, hwirq);
+ if (ret < 0)
+ return ret;
+
+ /* parent is UniPhier AIDET */
+ parent_fwspec.fwnode = domain->parent->fwnode;
+ parent_fwspec.param_count = 2;
+ parent_fwspec.param[0] = ret;
+ parent_fwspec.param[1] = (type == IRQ_TYPE_EDGE_BOTH) ?
+ IRQ_TYPE_EDGE_FALLING : type;
+
+ ret = irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
+ &priv->irq_chip, priv);
+ if (ret)
+ return ret;
+
+ return irq_domain_alloc_irqs_parent(domain, virq, 1, &parent_fwspec);
+ }
+
++static int uniphier_gpio_irq_domain_activate(struct irq_domain *domain,
++ struct irq_data *data, bool early)
+ {
+ struct uniphier_gpio_priv *priv = domain->host_data;
+ struct gpio_chip *chip = &priv->chip;
+
+ gpiochip_lock_as_irq(chip, data->hwirq + UNIPHIER_GPIO_IRQ_OFFSET);
++ return 0;
+ }
+
+ static void uniphier_gpio_irq_domain_deactivate(struct irq_domain *domain,
+ struct irq_data *data)
+ {
+ struct uniphier_gpio_priv *priv = domain->host_data;
+ struct gpio_chip *chip = &priv->chip;
+
+ gpiochip_unlock_as_irq(chip, data->hwirq + UNIPHIER_GPIO_IRQ_OFFSET);
+ }
+
+ static const struct irq_domain_ops uniphier_gpio_irq_domain_ops = {
+ .alloc = uniphier_gpio_irq_domain_alloc,
+ .free = irq_domain_free_irqs_common,
+ .activate = uniphier_gpio_irq_domain_activate,
+ .deactivate = uniphier_gpio_irq_domain_deactivate,
+ .translate = uniphier_gpio_irq_domain_translate,
+ };
+
+ static void uniphier_gpio_hw_init(struct uniphier_gpio_priv *priv)
+ {
+ /*
+ * Due to the hardware design, the noise filter must be enabled to
+ * detect both edge interrupts. This filter is intended to remove the
+ * noise from the irq lines. It does not work for GPIO input, so GPIO
+ * debounce is not supported. Unfortunately, the filter period is
+ * shared among all irq lines. Just choose a sensible period here.
+ */
+ writel(0xff, priv->regs + UNIPHIER_GPIO_IRQ_FLT_CYC);
+ }
+
+ static unsigned int uniphier_gpio_get_nbanks(unsigned int ngpio)
+ {
+ return DIV_ROUND_UP(ngpio, UNIPHIER_GPIO_LINES_PER_BANK);
+ }
+
+ static int uniphier_gpio_probe(struct platform_device *pdev)
+ {
+ struct device *dev = &pdev->dev;
+ struct device_node *parent_np;
+ struct irq_domain *parent_domain;
+ struct uniphier_gpio_priv *priv;
+ struct gpio_chip *chip;
+ struct irq_chip *irq_chip;
+ struct resource *regs;
+ unsigned int nregs;
+ u32 ngpios;
+ int ret;
+
+ parent_np = of_irq_find_parent(dev->of_node);
+ if (!parent_np)
+ return -ENXIO;
+
+ parent_domain = irq_find_host(parent_np);
+ of_node_put(parent_np);
+ if (!parent_domain)
+ return -EPROBE_DEFER;
+
+ ret = of_property_read_u32(dev->of_node, "ngpios", &ngpios);
+ if (ret)
+ return ret;
+
+ nregs = uniphier_gpio_get_nbanks(ngpios) * 2 + 3;
+ priv = devm_kzalloc(dev,
+ sizeof(*priv) + sizeof(priv->saved_vals[0]) * nregs,
+ GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ priv->regs = devm_ioremap_resource(dev, regs);
+ if (IS_ERR(priv->regs))
+ return PTR_ERR(priv->regs);
+
+ spin_lock_init(&priv->lock);
+
+ chip = &priv->chip;
+ chip->label = dev_name(dev);
+ chip->parent = dev;
+ chip->request = gpiochip_generic_request;
+ chip->free = gpiochip_generic_free;
+ chip->get_direction = uniphier_gpio_get_direction;
+ chip->direction_input = uniphier_gpio_direction_input;
+ chip->direction_output = uniphier_gpio_direction_output;
+ chip->get = uniphier_gpio_get;
+ chip->set = uniphier_gpio_set;
+ chip->set_multiple = uniphier_gpio_set_multiple;
+ chip->to_irq = uniphier_gpio_to_irq;
+ chip->base = -1;
+ chip->ngpio = ngpios;
+
+ irq_chip = &priv->irq_chip;
+ irq_chip->name = dev_name(dev);
+ irq_chip->irq_mask = uniphier_gpio_irq_mask;
+ irq_chip->irq_unmask = uniphier_gpio_irq_unmask;
+ irq_chip->irq_eoi = irq_chip_eoi_parent;
+ irq_chip->irq_set_affinity = irq_chip_set_affinity_parent;
+ irq_chip->irq_set_type = uniphier_gpio_irq_set_type;
+
+ uniphier_gpio_hw_init(priv);
+
+ ret = devm_gpiochip_add_data(dev, chip, priv);
+ if (ret)
+ return ret;
+
+ priv->domain = irq_domain_create_hierarchy(
+ parent_domain, 0,
+ UNIPHIER_GPIO_IRQ_MAX_NUM,
+ of_node_to_fwnode(dev->of_node),
+ &uniphier_gpio_irq_domain_ops, priv);
+ if (!priv->domain)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, priv);
+
+ return 0;
+ }
+
+ static int uniphier_gpio_remove(struct platform_device *pdev)
+ {
+ struct uniphier_gpio_priv *priv = platform_get_drvdata(pdev);
+
+ irq_domain_remove(priv->domain);
+
+ return 0;
+ }
+
+ static int __maybe_unused uniphier_gpio_suspend(struct device *dev)
+ {
+ struct uniphier_gpio_priv *priv = dev_get_drvdata(dev);
+ unsigned int nbanks = uniphier_gpio_get_nbanks(priv->chip.ngpio);
+ u32 *val = priv->saved_vals;
+ unsigned int reg;
+ int i;
+
+ for (i = 0; i < nbanks; i++) {
+ reg = uniphier_gpio_bank_to_reg(i);
+
+ *val++ = readl(priv->regs + reg + UNIPHIER_GPIO_PORT_DATA);
+ *val++ = readl(priv->regs + reg + UNIPHIER_GPIO_PORT_DIR);
+ }
+
+ *val++ = readl(priv->regs + UNIPHIER_GPIO_IRQ_EN);
+ *val++ = readl(priv->regs + UNIPHIER_GPIO_IRQ_MODE);
+ *val++ = readl(priv->regs + UNIPHIER_GPIO_IRQ_FLT_EN);
+
+ return 0;
+ }
+
+ static int __maybe_unused uniphier_gpio_resume(struct device *dev)
+ {
+ struct uniphier_gpio_priv *priv = dev_get_drvdata(dev);
+ unsigned int nbanks = uniphier_gpio_get_nbanks(priv->chip.ngpio);
+ const u32 *val = priv->saved_vals;
+ unsigned int reg;
+ int i;
+
+ for (i = 0; i < nbanks; i++) {
+ reg = uniphier_gpio_bank_to_reg(i);
+
+ writel(*val++, priv->regs + reg + UNIPHIER_GPIO_PORT_DATA);
+ writel(*val++, priv->regs + reg + UNIPHIER_GPIO_PORT_DIR);
+ }
+
+ writel(*val++, priv->regs + UNIPHIER_GPIO_IRQ_EN);
+ writel(*val++, priv->regs + UNIPHIER_GPIO_IRQ_MODE);
+ writel(*val++, priv->regs + UNIPHIER_GPIO_IRQ_FLT_EN);
+
+ uniphier_gpio_hw_init(priv);
+
+ return 0;
+ }
+
+ static const struct dev_pm_ops uniphier_gpio_pm_ops = {
+ SET_LATE_SYSTEM_SLEEP_PM_OPS(uniphier_gpio_suspend,
+ uniphier_gpio_resume)
+ };
+
+ static const struct of_device_id uniphier_gpio_match[] = {
+ { .compatible = "socionext,uniphier-gpio" },
+ { /* sentinel */ }
+ };
+ MODULE_DEVICE_TABLE(of, uniphier_gpio_match);
+
+ static struct platform_driver uniphier_gpio_driver = {
+ .probe = uniphier_gpio_probe,
+ .remove = uniphier_gpio_remove,
+ .driver = {
+ .name = "uniphier-gpio",
+ .of_match_table = uniphier_gpio_match,
+ .pm = &uniphier_gpio_pm_ops,
+ },
+ };
+ module_platform_driver(uniphier_gpio_driver);
+
+ MODULE_AUTHOR("Masahiro Yamada <yamada.masahiro@socionext.com>");
+ MODULE_DESCRIPTION("UniPhier GPIO driver");
+ MODULE_LICENSE("GPL");
projects / openwrt / staging / blogic.git / commitdiff