/* * Intel MID GPIO driver * * Copyright (c) 2008-2014,2016 Intel Corporation. * * 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. */ /* Supports: * Moorestown platform Langwell chip. * Medfield platform Penwell chip. * Clovertrail platform Cloverview chip. */ #include <linux/delay.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/gpio/driver.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/pci.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/slab.h> #include <linux/stddef.h> #define INTEL_MID_IRQ_TYPE_EDGE (1 << 0) #define INTEL_MID_IRQ_TYPE_LEVEL (1 << 1) /* * Langwell chip has 64 pins and thus there are 2 32bit registers to control * each feature, while Penwell chip has 96 pins for each block, and need 3 32bit * registers to control them, so we only define the order here instead of a * structure, to get a bit offset for a pin (use GPDR as an example): * * nreg = ngpio / 32; * reg = offset / 32; * bit = offset % 32; * reg_addr = reg_base + GPDR * nreg * 4 + reg * 4; * * so the bit of reg_addr is to control pin offset's GPDR feature */ enum GPIO_REG { GPLR = 0, /* pin level read-only */ GPDR, /* pin direction */ GPSR, /* pin set */ GPCR, /* pin clear */ GRER, /* rising edge detect */ GFER, /* falling edge detect */ GEDR, /* edge detect result */ GAFR, /* alt function */ }; /* intel_mid gpio driver data */ struct intel_mid_gpio_ddata { u16 ngpio; /* number of gpio pins */ u32 chip_irq_type; /* chip interrupt type */ }; struct intel_mid_gpio { struct gpio_chip chip; void __iomem *reg_base; spinlock_t lock; struct pci_dev *pdev; }; static void __iomem *gpio_reg(struct gpio_chip *chip, unsigned offset, enum GPIO_REG reg_type) { struct intel_mid_gpio *priv = gpiochip_get_data(chip); unsigned nreg = chip->ngpio / 32; u8 reg = offset / 32; return priv->reg_base + reg_type * nreg * 4 + reg * 4; } static void __iomem *gpio_reg_2bit(struct gpio_chip *chip, unsigned offset, enum GPIO_REG reg_type) { struct intel_mid_gpio *priv = gpiochip_get_data(chip); unsigned nreg = chip->ngpio / 32; u8 reg = offset / 16; return priv->reg_base + reg_type * nreg * 4 + reg * 4; } static int intel_gpio_request(struct gpio_chip *chip, unsigned offset) { void __iomem *gafr = gpio_reg_2bit(chip, offset, GAFR); u32 value = readl(gafr); int shift = (offset % 16) << 1, af = (value >> shift) & 3; if (af) { value &= ~(3 << shift); writel(value, gafr); } return 0; } static int intel_gpio_get(struct gpio_chip *chip, unsigned offset) { void __iomem *gplr = gpio_reg(chip, offset, GPLR); return !!(readl(gplr) & BIT(offset % 32)); } static void intel_gpio_set(struct gpio_chip *chip, unsigned offset, int value) { void __iomem *gpsr, *gpcr; 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); } } static int intel_gpio_direction_input(struct gpio_chip *chip, unsigned offset) { struct intel_mid_gpio *priv = gpiochip_get_data(chip); void __iomem *gpdr = gpio_reg(chip, offset, GPDR); u32 value; unsigned long flags; if (priv->pdev) pm_runtime_get(&priv->pdev->dev); spin_lock_irqsave(&priv->lock, flags); value = readl(gpdr); value &= ~BIT(offset % 32); writel(value, gpdr); spin_unlock_irqrestore(&priv->lock, flags); if (priv->pdev) pm_runtime_put(&priv->pdev->dev); return 0; } static int intel_gpio_direction_output(struct gpio_chip *chip, unsigned offset, int value) { struct intel_mid_gpio *priv = gpiochip_get_data(chip); void __iomem *gpdr = gpio_reg(chip, offset, GPDR); unsigned long flags; intel_gpio_set(chip, offset, value); if (priv->pdev) pm_runtime_get(&priv->pdev->dev); spin_lock_irqsave(&priv->lock, flags); value = readl(gpdr); value |= BIT(offset % 32); writel(value, gpdr); spin_unlock_irqrestore(&priv->lock, flags); if (priv->pdev) pm_runtime_put(&priv->pdev->dev); return 0; } static int intel_mid_irq_type(struct irq_data *d, unsigned type) { struct gpio_chip *gc = irq_data_get_irq_chip_data(d); struct intel_mid_gpio *priv = gpiochip_get_data(gc); u32 gpio = irqd_to_hwirq(d); unsigned long flags; u32 value; void __iomem *grer = gpio_reg(&priv->chip, gpio, GRER); void __iomem *gfer = gpio_reg(&priv->chip, gpio, GFER); if (gpio >= priv->chip.ngpio) return -EINVAL; if (priv->pdev) pm_runtime_get(&priv->pdev->dev); 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); spin_unlock_irqrestore(&priv->lock, flags); if (priv->pdev) pm_runtime_put(&priv->pdev->dev); return 0; } static void intel_mid_irq_unmask(struct irq_data *d) { } static void intel_mid_irq_mask(struct irq_data *d) { } static struct irq_chip intel_mid_irqchip = { .name = "INTEL_MID-GPIO", .irq_mask = intel_mid_irq_mask, .irq_unmask = intel_mid_irq_unmask, .irq_set_type = intel_mid_irq_type, }; static const struct intel_mid_gpio_ddata gpio_lincroft = { .ngpio = 64, }; static const struct intel_mid_gpio_ddata gpio_penwell_aon = { .ngpio = 96, .chip_irq_type = INTEL_MID_IRQ_TYPE_EDGE, }; static const struct intel_mid_gpio_ddata gpio_penwell_core = { .ngpio = 96, .chip_irq_type = INTEL_MID_IRQ_TYPE_EDGE, }; static const struct intel_mid_gpio_ddata gpio_cloverview_aon = { .ngpio = 96, .chip_irq_type = INTEL_MID_IRQ_TYPE_EDGE | INTEL_MID_IRQ_TYPE_LEVEL, }; static const struct intel_mid_gpio_ddata gpio_cloverview_core = { .ngpio = 96, .chip_irq_type = INTEL_MID_IRQ_TYPE_EDGE, }; static const struct pci_device_id intel_gpio_ids[] = { { /* Lincroft */ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x080f), .driver_data = (kernel_ulong_t)&gpio_lincroft, }, { /* Penwell AON */ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081f), .driver_data = (kernel_ulong_t)&gpio_penwell_aon, }, { /* Penwell Core */ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081a), .driver_data = (kernel_ulong_t)&gpio_penwell_core, }, { /* Cloverview Aon */ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x08eb), .driver_data = (kernel_ulong_t)&gpio_cloverview_aon, }, { /* Cloverview Core */ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x08f7), .driver_data = (kernel_ulong_t)&gpio_cloverview_core, }, { 0 } }; MODULE_DEVICE_TABLE(pci, intel_gpio_ids); static void intel_mid_irq_handler(struct irq_desc *desc) { struct gpio_chip *gc = irq_desc_get_handler_data(desc); struct intel_mid_gpio *priv = gpiochip_get_data(gc); struct irq_data *data = irq_desc_get_irq_data(desc); struct irq_chip *chip = irq_data_get_irq_chip(data); u32 base, gpio, mask; unsigned long pending; void __iomem *gedr; /* check GPIO controller to check which pin triggered the interrupt */ for (base = 0; base < priv->chip.ngpio; base += 32) { gedr = gpio_reg(&priv->chip, base, GEDR); while ((pending = readl(gedr))) { gpio = __ffs(pending); mask = BIT(gpio); /* Clear before handling so we can't lose an edge */ writel(mask, gedr); generic_handle_irq(irq_find_mapping(gc->irq.domain, base + gpio)); } } chip->irq_eoi(data); } static void intel_mid_irq_init_hw(struct intel_mid_gpio *priv) { void __iomem *reg; unsigned 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); /* Clear the edge detect status register */ reg = gpio_reg(&priv->chip, base, GEDR); writel(~0, reg); } } static int __maybe_unused intel_gpio_runtime_idle(struct device *dev) { int err = pm_schedule_suspend(dev, 500); return err ?: -EBUSY; } static const struct dev_pm_ops intel_gpio_pm_ops = { SET_RUNTIME_PM_OPS(NULL, NULL, intel_gpio_runtime_idle) }; static int intel_gpio_probe(struct pci_dev *pdev, const struct pci_device_id *id) { void __iomem *base; struct intel_mid_gpio *priv; u32 gpio_base; u32 irq_base; int retval; struct intel_mid_gpio_ddata *ddata = (struct intel_mid_gpio_ddata *)id->driver_data; retval = pcim_enable_device(pdev); if (retval) return retval; retval = pcim_iomap_regions(pdev, 1 << 0 | 1 << 1, 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, 1 << 1); priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; priv->reg_base = pcim_iomap_table(pdev)[0]; priv->chip.label = dev_name(&pdev->dev); priv->chip.parent = &pdev->dev; priv->chip.request = intel_gpio_request; priv->chip.direction_input = intel_gpio_direction_input; priv->chip.direction_output = intel_gpio_direction_output; priv->chip.get = intel_gpio_get; priv->chip.set = intel_gpio_set; priv->chip.base = gpio_base; priv->chip.ngpio = ddata->ngpio; priv->chip.can_sleep = false; priv->pdev = pdev; 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; } retval = gpiochip_irqchip_add(&priv->chip, &intel_mid_irqchip, irq_base, handle_simple_irq, IRQ_TYPE_NONE); if (retval) { dev_err(&pdev->dev, "could not connect irqchip to gpiochip\n"); return retval; } intel_mid_irq_init_hw(priv); gpiochip_set_chained_irqchip(&priv->chip, &intel_mid_irqchip, pdev->irq, intel_mid_irq_handler); pm_runtime_put_noidle(&pdev->dev); pm_runtime_allow(&pdev->dev); return 0; } static struct pci_driver intel_gpio_driver = { .name = "intel_mid_gpio", .id_table = intel_gpio_ids, .probe = intel_gpio_probe, .driver = { .pm = &intel_gpio_pm_ops, }, }; builtin_pci_driver(intel_gpio_driver);