diff options
Diffstat (limited to 'drivers/gpio/gpio-intel-mid.c')
| -rw-r--r-- | drivers/gpio/gpio-intel-mid.c | 471 |
1 files changed, 471 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-intel-mid.c b/drivers/gpio/gpio-intel-mid.c new file mode 100644 index 00000000000..be803af658a --- /dev/null +++ b/drivers/gpio/gpio-intel-mid.c @@ -0,0 +1,471 @@ +/* + * Moorestown platform Langwell chip GPIO driver + * + * Copyright (c) 2008, 2009, 2013, 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +/* Supports: + * Moorestown platform Langwell chip. + * Medfield platform Penwell chip. + * Clovertrail platform Cloverview chip. + * Merrifield platform Tangier chip. + */ + +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/platform_device.h> +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/stddef.h> +#include <linux/interrupt.h> +#include <linux/init.h> +#include <linux/irq.h> +#include <linux/io.h> +#include <linux/gpio.h> +#include <linux/slab.h> +#include <linux/pm_runtime.h> +#include <linux/irqdomain.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 gplr_offset; /* offset of first GPLR register from base */ + u32 flis_base; /* base address of FLIS registers */ + u32 flis_len; /* length of FLIS registers */ + u32 (*get_flis_offset)(int gpio); + 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; + struct irq_domain *domain; +}; + +#define to_intel_gpio_priv(chip) container_of(chip, struct intel_mid_gpio, chip) + +static void __iomem *gpio_reg(struct gpio_chip *chip, unsigned offset, + enum GPIO_REG reg_type) +{ + struct intel_mid_gpio *priv = to_intel_gpio_priv(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 = to_intel_gpio_priv(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 = to_intel_gpio_priv(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 = to_intel_gpio_priv(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_gpio_to_irq(struct gpio_chip *chip, unsigned offset) +{ + struct intel_mid_gpio *priv = to_intel_gpio_priv(chip); + return irq_create_mapping(priv->domain, offset); +} + +static int intel_mid_irq_type(struct irq_data *d, unsigned type) +{ + struct intel_mid_gpio *priv = irq_data_get_irq_chip_data(d); + 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 intel_mid_gpio_ddata gpio_tangier = { + .ngpio = 192, + .gplr_offset = 4, + .flis_base = 0xff0c0000, + .flis_len = 0x8000, + .get_flis_offset = NULL, + .chip_irq_type = INTEL_MID_IRQ_TYPE_EDGE, +}; + +static DEFINE_PCI_DEVICE_TABLE(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, + }, + { + /* Tangier */ + PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x1199), + .driver_data = (kernel_ulong_t)&gpio_tangier, + }, + { 0 } +}; +MODULE_DEVICE_TABLE(pci, intel_gpio_ids); + +static void intel_mid_irq_handler(unsigned irq, struct irq_desc *desc) +{ + struct irq_data *data = irq_desc_get_irq_data(desc); + struct intel_mid_gpio *priv = irq_data_get_irq_handler_data(data); + 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(priv->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 intel_gpio_irq_map(struct irq_domain *d, unsigned int irq, + irq_hw_number_t hwirq) +{ + struct intel_mid_gpio *priv = d->host_data; + + irq_set_chip_and_handler_name(irq, &intel_mid_irqchip, + handle_simple_irq, "demux"); + irq_set_chip_data(irq, priv); + irq_set_irq_type(irq, IRQ_TYPE_NONE); + + return 0; +} + +static const struct irq_domain_ops intel_gpio_irq_ops = { + .map = intel_gpio_irq_map, + .xlate = irq_domain_xlate_twocell, +}; + +static int intel_gpio_runtime_idle(struct device *dev) +{ + pm_schedule_suspend(dev, 500); + return -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) { + dev_err(&pdev->dev, "can't allocate chip data\n"); + return -ENOMEM; + } + + priv->reg_base = pcim_iomap_table(pdev)[0]; + priv->chip.label = dev_name(&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.to_irq = intel_gpio_to_irq; + priv->chip.base = gpio_base; + priv->chip.ngpio = ddata->ngpio; + priv->chip.can_sleep = 0; + priv->pdev = pdev; + + spin_lock_init(&priv->lock); + + priv->domain = irq_domain_add_simple(pdev->dev.of_node, ddata->ngpio, + irq_base, &intel_gpio_irq_ops, priv); + if (!priv->domain) + return -ENOMEM; + + pci_set_drvdata(pdev, priv); + retval = gpiochip_add(&priv->chip); + if (retval) { + dev_err(&pdev->dev, "gpiochip_add error %d\n", retval); + return retval; + } + + intel_mid_irq_init_hw(priv); + + irq_set_handler_data(pdev->irq, priv); + irq_set_chained_handler(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, + }, +}; + +static int __init intel_gpio_init(void) +{ + return pci_register_driver(&intel_gpio_driver); +} + +device_initcall(intel_gpio_init); |