diff options
Diffstat (limited to 'drivers/gpio/gpio-merrifield.c')
| -rw-r--r-- | drivers/gpio/gpio-merrifield.c | 444 |
1 files changed, 444 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-merrifield.c b/drivers/gpio/gpio-merrifield.c new file mode 100644 index 000000000000..45b51278b8ee --- /dev/null +++ b/drivers/gpio/gpio-merrifield.c @@ -0,0 +1,444 @@ +/* + * Intel Merrifield SoC GPIO driver + * + * Copyright (c) 2016 Intel Corporation. + * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.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. + */ + +#include <linux/bitops.h> +#include <linux/gpio/driver.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/pinctrl/consumer.h> + +#define GCCR 0x000 /* controller configuration */ +#define GPLR 0x004 /* pin level r/o */ +#define GPDR 0x01c /* pin direction */ +#define GPSR 0x034 /* pin set w/o */ +#define GPCR 0x04c /* pin clear w/o */ +#define GRER 0x064 /* rising edge detect */ +#define GFER 0x07c /* falling edge detect */ +#define GFBR 0x094 /* glitch filter bypass */ +#define GIMR 0x0ac /* interrupt mask */ +#define GISR 0x0c4 /* interrupt source */ +#define GITR 0x300 /* input type */ +#define GLPR 0x318 /* level input polarity */ +#define GWMR 0x400 /* wake mask */ +#define GWSR 0x418 /* wake source */ +#define GSIR 0xc00 /* secure input */ + +/* Intel Merrifield has 192 GPIO pins */ +#define MRFLD_NGPIO 192 + +struct mrfld_gpio_pinrange { + unsigned int gpio_base; + unsigned int pin_base; + unsigned int npins; +}; + +#define GPIO_PINRANGE(gstart, gend, pstart) \ + { \ + .gpio_base = (gstart), \ + .pin_base = (pstart), \ + .npins = (gend) - (gstart) + 1, \ + } + +struct mrfld_gpio { + struct gpio_chip chip; + void __iomem *reg_base; + raw_spinlock_t lock; + struct device *dev; +}; + +static const struct mrfld_gpio_pinrange mrfld_gpio_ranges[] = { + GPIO_PINRANGE(0, 11, 146), + GPIO_PINRANGE(12, 13, 144), + GPIO_PINRANGE(14, 15, 35), + GPIO_PINRANGE(16, 16, 164), + GPIO_PINRANGE(17, 18, 105), + GPIO_PINRANGE(19, 22, 101), + GPIO_PINRANGE(23, 30, 107), + GPIO_PINRANGE(32, 43, 67), + GPIO_PINRANGE(44, 63, 195), + GPIO_PINRANGE(64, 67, 140), + GPIO_PINRANGE(68, 69, 165), + GPIO_PINRANGE(70, 71, 65), + GPIO_PINRANGE(72, 76, 228), + GPIO_PINRANGE(77, 86, 37), + GPIO_PINRANGE(87, 87, 48), + GPIO_PINRANGE(88, 88, 47), + GPIO_PINRANGE(89, 96, 49), + GPIO_PINRANGE(97, 97, 34), + GPIO_PINRANGE(102, 119, 83), + GPIO_PINRANGE(120, 123, 79), + GPIO_PINRANGE(124, 135, 115), + GPIO_PINRANGE(137, 142, 158), + GPIO_PINRANGE(154, 163, 24), + GPIO_PINRANGE(164, 176, 215), + GPIO_PINRANGE(177, 189, 127), + GPIO_PINRANGE(190, 191, 178), +}; + +static void __iomem *gpio_reg(struct gpio_chip *chip, unsigned int offset, + unsigned int reg_type_offset) +{ + struct mrfld_gpio *priv = gpiochip_get_data(chip); + u8 reg = offset / 32; + + return priv->reg_base + reg_type_offset + reg * 4; +} + +static int mrfld_gpio_get(struct gpio_chip *chip, unsigned int offset) +{ + void __iomem *gplr = gpio_reg(chip, offset, GPLR); + + return !!(readl(gplr) & BIT(offset % 32)); +} + +static void mrfld_gpio_set(struct gpio_chip *chip, unsigned int offset, + int value) +{ + struct mrfld_gpio *priv = gpiochip_get_data(chip); + void __iomem *gpsr, *gpcr; + unsigned long flags; + + raw_spin_lock_irqsave(&priv->lock, flags); + + if (value) { + gpsr = gpio_reg(chip, offset, GPSR); + writel(BIT(offset % 32), gpsr); + } else { + gpcr = gpio_reg(chip, offset, GPCR); + writel(BIT(offset % 32), gpcr); + } + + raw_spin_unlock_irqrestore(&priv->lock, flags); +} + +static int mrfld_gpio_direction_input(struct gpio_chip *chip, + unsigned int offset) +{ + struct mrfld_gpio *priv = gpiochip_get_data(chip); + void __iomem *gpdr = gpio_reg(chip, offset, GPDR); + unsigned long flags; + u32 value; + + raw_spin_lock_irqsave(&priv->lock, flags); + + value = readl(gpdr); + value &= ~BIT(offset % 32); + writel(value, gpdr); + + raw_spin_unlock_irqrestore(&priv->lock, flags); + + return 0; +} + +static int mrfld_gpio_direction_output(struct gpio_chip *chip, + unsigned int offset, int value) +{ + struct mrfld_gpio *priv = gpiochip_get_data(chip); + void __iomem *gpdr = gpio_reg(chip, offset, GPDR); + unsigned long flags; + + mrfld_gpio_set(chip, offset, value); + + raw_spin_lock_irqsave(&priv->lock, flags); + + value = readl(gpdr); + value |= BIT(offset % 32); + writel(value, gpdr); + + raw_spin_unlock_irqrestore(&priv->lock, flags); + + return 0; +} + +static void mrfld_irq_ack(struct irq_data *d) +{ + struct mrfld_gpio *priv = irq_data_get_irq_chip_data(d); + u32 gpio = irqd_to_hwirq(d); + void __iomem *gisr = gpio_reg(&priv->chip, gpio, GISR); + unsigned long flags; + + raw_spin_lock_irqsave(&priv->lock, flags); + + writel(BIT(gpio % 32), gisr); + + raw_spin_unlock_irqrestore(&priv->lock, flags); +} + +static void mrfld_irq_unmask_mask(struct irq_data *d, bool unmask) +{ + struct mrfld_gpio *priv = irq_data_get_irq_chip_data(d); + u32 gpio = irqd_to_hwirq(d); + void __iomem *gimr = gpio_reg(&priv->chip, gpio, GIMR); + unsigned long flags; + u32 value; + + raw_spin_lock_irqsave(&priv->lock, flags); + + if (unmask) + value = readl(gimr) | BIT(gpio % 32); + else + value = readl(gimr) & ~BIT(gpio % 32); + writel(value, gimr); + + raw_spin_unlock_irqrestore(&priv->lock, flags); +} + +static void mrfld_irq_mask(struct irq_data *d) +{ + mrfld_irq_unmask_mask(d, false); +} + +static void mrfld_irq_unmask(struct irq_data *d) +{ + mrfld_irq_unmask_mask(d, true); +} + +static int mrfld_irq_set_type(struct irq_data *d, unsigned int type) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + struct mrfld_gpio *priv = gpiochip_get_data(gc); + u32 gpio = irqd_to_hwirq(d); + void __iomem *grer = gpio_reg(&priv->chip, gpio, GRER); + void __iomem *gfer = gpio_reg(&priv->chip, gpio, GFER); + void __iomem *gitr = gpio_reg(&priv->chip, gpio, GITR); + void __iomem *glpr = gpio_reg(&priv->chip, gpio, GLPR); + unsigned long flags; + u32 value; + + raw_spin_lock_irqsave(&priv->lock, flags); + + if (type & IRQ_TYPE_EDGE_RISING) + value = readl(grer) | BIT(gpio % 32); + else + value = readl(grer) & ~BIT(gpio % 32); + writel(value, grer); + + if (type & IRQ_TYPE_EDGE_FALLING) + value = readl(gfer) | BIT(gpio % 32); + else + value = readl(gfer) & ~BIT(gpio % 32); + writel(value, gfer); + + /* + * To prevent glitches from triggering an unintended level interrupt, + * configure GLPR register first and then configure GITR. + */ + if (type & IRQ_TYPE_LEVEL_LOW) + value = readl(glpr) | BIT(gpio % 32); + else + value = readl(glpr) & ~BIT(gpio % 32); + writel(value, glpr); + + if (type & IRQ_TYPE_LEVEL_MASK) { + value = readl(gitr) | BIT(gpio % 32); + writel(value, gitr); + + irq_set_handler_locked(d, handle_level_irq); + } else if (type & IRQ_TYPE_EDGE_BOTH) { + value = readl(gitr) & ~BIT(gpio % 32); + writel(value, gitr); + + irq_set_handler_locked(d, handle_edge_irq); + } + + raw_spin_unlock_irqrestore(&priv->lock, flags); + + return 0; +} + +static int mrfld_irq_set_wake(struct irq_data *d, unsigned int on) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + struct mrfld_gpio *priv = gpiochip_get_data(gc); + u32 gpio = irqd_to_hwirq(d); + void __iomem *gwmr = gpio_reg(&priv->chip, gpio, GWMR); + void __iomem *gwsr = gpio_reg(&priv->chip, gpio, GWSR); + unsigned long flags; + u32 value; + + raw_spin_lock_irqsave(&priv->lock, flags); + + /* Clear the existing wake status */ + writel(BIT(gpio % 32), gwsr); + + if (on) + value = readl(gwmr) | BIT(gpio % 32); + else + value = readl(gwmr) & ~BIT(gpio % 32); + writel(value, gwmr); + + raw_spin_unlock_irqrestore(&priv->lock, flags); + + dev_dbg(priv->dev, "%sable wake for gpio %u\n", on ? "en" : "dis", gpio); + return 0; +} + +static struct irq_chip mrfld_irqchip = { + .name = "gpio-merrifield", + .irq_ack = mrfld_irq_ack, + .irq_mask = mrfld_irq_mask, + .irq_unmask = mrfld_irq_unmask, + .irq_set_type = mrfld_irq_set_type, + .irq_set_wake = mrfld_irq_set_wake, +}; + +static void mrfld_irq_handler(struct irq_desc *desc) +{ + struct gpio_chip *gc = irq_desc_get_handler_data(desc); + struct mrfld_gpio *priv = gpiochip_get_data(gc); + struct irq_chip *irqchip = irq_desc_get_chip(desc); + unsigned long base, gpio; + + chained_irq_enter(irqchip, desc); + + /* Check GPIO controller to check which pin triggered the interrupt */ + for (base = 0; base < priv->chip.ngpio; base += 32) { + void __iomem *gisr = gpio_reg(&priv->chip, base, GISR); + void __iomem *gimr = gpio_reg(&priv->chip, base, GIMR); + unsigned long pending, enabled; + + pending = readl(gisr); + enabled = readl(gimr); + + /* Only interrupts that are enabled */ + pending &= enabled; + + for_each_set_bit(gpio, &pending, 32) { + unsigned int irq; + + irq = irq_find_mapping(gc->irqdomain, base + gpio); + generic_handle_irq(irq); + } + } + + chained_irq_exit(irqchip, desc); +} + +static void mrfld_irq_init_hw(struct mrfld_gpio *priv) +{ + void __iomem *reg; + unsigned int base; + + for (base = 0; base < priv->chip.ngpio; base += 32) { + /* Clear the rising-edge detect register */ + reg = gpio_reg(&priv->chip, base, GRER); + writel(0, reg); + /* Clear the falling-edge detect register */ + reg = gpio_reg(&priv->chip, base, GFER); + writel(0, reg); + } +} + +static int mrfld_gpio_probe(struct pci_dev *pdev, const struct pci_device_id *id) +{ + const struct mrfld_gpio_pinrange *range; + struct mrfld_gpio *priv; + u32 gpio_base, irq_base; + void __iomem *base; + unsigned int i; + int retval; + + retval = pcim_enable_device(pdev); + if (retval) + return retval; + + retval = pcim_iomap_regions(pdev, BIT(1) | BIT(0), pci_name(pdev)); + if (retval) { + dev_err(&pdev->dev, "I/O memory mapping error\n"); + return retval; + } + + base = pcim_iomap_table(pdev)[1]; + + irq_base = readl(base); + gpio_base = readl(sizeof(u32) + base); + + /* Release the IO mapping, since we already get the info from BAR1 */ + pcim_iounmap_regions(pdev, BIT(1)); + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) { + dev_err(&pdev->dev, "can't allocate chip data\n"); + return -ENOMEM; + } + + priv->dev = &pdev->dev; + priv->reg_base = pcim_iomap_table(pdev)[0]; + + priv->chip.label = dev_name(&pdev->dev); + priv->chip.parent = &pdev->dev; + priv->chip.request = gpiochip_generic_request; + priv->chip.free = gpiochip_generic_free; + priv->chip.direction_input = mrfld_gpio_direction_input; + priv->chip.direction_output = mrfld_gpio_direction_output; + priv->chip.get = mrfld_gpio_get; + priv->chip.set = mrfld_gpio_set; + priv->chip.base = gpio_base; + priv->chip.ngpio = MRFLD_NGPIO; + priv->chip.can_sleep = false; + + raw_spin_lock_init(&priv->lock); + + pci_set_drvdata(pdev, priv); + retval = devm_gpiochip_add_data(&pdev->dev, &priv->chip, priv); + if (retval) { + dev_err(&pdev->dev, "gpiochip_add error %d\n", retval); + return retval; + } + + for (i = 0; i < ARRAY_SIZE(mrfld_gpio_ranges); i++) { + range = &mrfld_gpio_ranges[i]; + retval = gpiochip_add_pin_range(&priv->chip, + "pinctrl-merrifield", + range->gpio_base, + range->pin_base, + range->npins); + if (retval) { + dev_err(&pdev->dev, "failed to add GPIO pin range\n"); + return retval; + } + } + + retval = gpiochip_irqchip_add(&priv->chip, &mrfld_irqchip, irq_base, + handle_simple_irq, IRQ_TYPE_NONE); + if (retval) { + dev_err(&pdev->dev, "could not connect irqchip to gpiochip\n"); + return retval; + } + + mrfld_irq_init_hw(priv); + + gpiochip_set_chained_irqchip(&priv->chip, &mrfld_irqchip, pdev->irq, + mrfld_irq_handler); + + return 0; +} + +static const struct pci_device_id mrfld_gpio_ids[] = { + { PCI_VDEVICE(INTEL, 0x1199) }, + { } +}; +MODULE_DEVICE_TABLE(pci, mrfld_gpio_ids); + +static struct pci_driver mrfld_gpio_driver = { + .name = "gpio-merrifield", + .id_table = mrfld_gpio_ids, + .probe = mrfld_gpio_probe, +}; + +module_pci_driver(mrfld_gpio_driver); + +MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>"); +MODULE_DESCRIPTION("Intel Merrifield SoC GPIO driver"); +MODULE_LICENSE("GPL v2"); |