diff options
Diffstat (limited to 'drivers/pinctrl/pinctrl-baytrail.c')
| -rw-r--r-- | drivers/pinctrl/pinctrl-baytrail.c | 543 |
1 files changed, 543 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinctrl-baytrail.c b/drivers/pinctrl/pinctrl-baytrail.c new file mode 100644 index 000000000000..e9d735dcebfb --- /dev/null +++ b/drivers/pinctrl/pinctrl-baytrail.c @@ -0,0 +1,543 @@ +/* + * Pinctrl GPIO driver for Intel Baytrail + * Copyright (c) 2012-2013, Intel Corporation. + * + * Author: Mathias Nyman <mathias.nyman@linux.intel.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/types.h> +#include <linux/bitops.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/gpio.h> +#include <linux/irqdomain.h> +#include <linux/acpi.h> +#include <linux/acpi_gpio.h> +#include <linux/platform_device.h> +#include <linux/seq_file.h> +#include <linux/io.h> +#include <linux/pm_runtime.h> +#include <linux/pinctrl/pinctrl.h> + +/* memory mapped register offsets */ +#define BYT_CONF0_REG 0x000 +#define BYT_CONF1_REG 0x004 +#define BYT_VAL_REG 0x008 +#define BYT_DFT_REG 0x00c +#define BYT_INT_STAT_REG 0x800 + +/* BYT_CONF0_REG register bits */ +#define BYT_TRIG_NEG BIT(26) +#define BYT_TRIG_POS BIT(25) +#define BYT_TRIG_LVL BIT(24) +#define BYT_PIN_MUX 0x07 + +/* BYT_VAL_REG register bits */ +#define BYT_INPUT_EN BIT(2) /* 0: input enabled (active low)*/ +#define BYT_OUTPUT_EN BIT(1) /* 0: output enabled (active low)*/ +#define BYT_LEVEL BIT(0) + +#define BYT_DIR_MASK (BIT(1) | BIT(2)) +#define BYT_TRIG_MASK (BIT(26) | BIT(25) | BIT(24)) + +#define BYT_NGPIO_SCORE 102 +#define BYT_NGPIO_NCORE 28 +#define BYT_NGPIO_SUS 44 + +/* + * Baytrail gpio controller consist of three separate sub-controllers called + * SCORE, NCORE and SUS. The sub-controllers are identified by their acpi UID. + * + * GPIO numbering is _not_ ordered meaning that gpio # 0 in ACPI namespace does + * _not_ correspond to the first gpio register at controller's gpio base. + * There is no logic or pattern in mapping gpio numbers to registers (pads) so + * each sub-controller needs to have its own mapping table + */ + +/* score_pins[gpio_nr] = pad_nr */ + +static unsigned const score_pins[BYT_NGPIO_SCORE] = { + 85, 89, 93, 96, 99, 102, 98, 101, 34, 37, + 36, 38, 39, 35, 40, 84, 62, 61, 64, 59, + 54, 56, 60, 55, 63, 57, 51, 50, 53, 47, + 52, 49, 48, 43, 46, 41, 45, 42, 58, 44, + 95, 105, 70, 68, 67, 66, 69, 71, 65, 72, + 86, 90, 88, 92, 103, 77, 79, 83, 78, 81, + 80, 82, 13, 12, 15, 14, 17, 18, 19, 16, + 2, 1, 0, 4, 6, 7, 9, 8, 33, 32, + 31, 30, 29, 27, 25, 28, 26, 23, 21, 20, + 24, 22, 5, 3, 10, 11, 106, 87, 91, 104, + 97, 100, +}; + +static unsigned const ncore_pins[BYT_NGPIO_NCORE] = { + 19, 18, 17, 20, 21, 22, 24, 25, 23, 16, + 14, 15, 12, 26, 27, 1, 4, 8, 11, 0, + 3, 6, 10, 13, 2, 5, 9, 7, +}; + +static unsigned const sus_pins[BYT_NGPIO_SUS] = { + 29, 33, 30, 31, 32, 34, 36, 35, 38, 37, + 18, 7, 11, 20, 17, 1, 8, 10, 19, 12, + 0, 2, 23, 39, 28, 27, 22, 21, 24, 25, + 26, 51, 56, 54, 49, 55, 48, 57, 50, 58, + 52, 53, 59, 40, +}; + +static struct pinctrl_gpio_range byt_ranges[] = { + { + .name = "1", /* match with acpi _UID in probe */ + .npins = BYT_NGPIO_SCORE, + .pins = score_pins, + }, + { + .name = "2", + .npins = BYT_NGPIO_NCORE, + .pins = ncore_pins, + }, + { + .name = "3", + .npins = BYT_NGPIO_SUS, + .pins = sus_pins, + }, + { + }, +}; + +struct byt_gpio { + struct gpio_chip chip; + struct irq_domain *domain; + struct platform_device *pdev; + spinlock_t lock; + void __iomem *reg_base; + struct pinctrl_gpio_range *range; +}; + +static void __iomem *byt_gpio_reg(struct gpio_chip *chip, unsigned offset, + int reg) +{ + struct byt_gpio *vg = container_of(chip, struct byt_gpio, chip); + u32 reg_offset; + void __iomem *ptr; + + if (reg == BYT_INT_STAT_REG) + reg_offset = (offset / 32) * 4; + else + reg_offset = vg->range->pins[offset] * 16; + + ptr = (void __iomem *) (vg->reg_base + reg_offset + reg); + return ptr; +} + +static int byt_gpio_request(struct gpio_chip *chip, unsigned offset) +{ + struct byt_gpio *vg = container_of(chip, struct byt_gpio, chip); + + pm_runtime_get(&vg->pdev->dev); + + return 0; +} + +static void byt_gpio_free(struct gpio_chip *chip, unsigned offset) +{ + struct byt_gpio *vg = container_of(chip, struct byt_gpio, chip); + void __iomem *reg = byt_gpio_reg(&vg->chip, offset, BYT_CONF0_REG); + u32 value; + + /* clear interrupt triggering */ + value = readl(reg); + value &= ~(BYT_TRIG_POS | BYT_TRIG_NEG | BYT_TRIG_LVL); + writel(value, reg); + + pm_runtime_put(&vg->pdev->dev); +} + +static int byt_irq_type(struct irq_data *d, unsigned type) +{ + struct byt_gpio *vg = irq_data_get_irq_chip_data(d); + u32 offset = irqd_to_hwirq(d); + u32 value; + unsigned long flags; + void __iomem *reg = byt_gpio_reg(&vg->chip, offset, BYT_CONF0_REG); + + if (offset >= vg->chip.ngpio) + return -EINVAL; + + spin_lock_irqsave(&vg->lock, flags); + value = readl(reg); + + /* For level trigges the BYT_TRIG_POS and BYT_TRIG_NEG bits + * are used to indicate high and low level triggering + */ + value &= ~(BYT_TRIG_POS | BYT_TRIG_NEG | BYT_TRIG_LVL); + + switch (type) { + case IRQ_TYPE_LEVEL_HIGH: + value |= BYT_TRIG_LVL; + case IRQ_TYPE_EDGE_RISING: + value |= BYT_TRIG_POS; + break; + case IRQ_TYPE_LEVEL_LOW: + value |= BYT_TRIG_LVL; + case IRQ_TYPE_EDGE_FALLING: + value |= BYT_TRIG_NEG; + break; + case IRQ_TYPE_EDGE_BOTH: + value |= (BYT_TRIG_NEG | BYT_TRIG_POS); + break; + } + writel(value, reg); + + spin_unlock_irqrestore(&vg->lock, flags); + + return 0; +} + +static int byt_gpio_get(struct gpio_chip *chip, unsigned offset) +{ + void __iomem *reg = byt_gpio_reg(chip, offset, BYT_VAL_REG); + return readl(reg) & BYT_LEVEL; +} + +static void byt_gpio_set(struct gpio_chip *chip, unsigned offset, int value) +{ + struct byt_gpio *vg = container_of(chip, struct byt_gpio, chip); + void __iomem *reg = byt_gpio_reg(chip, offset, BYT_VAL_REG); + unsigned long flags; + u32 old_val; + + spin_lock_irqsave(&vg->lock, flags); + + old_val = readl(reg); + + if (value) + writel(old_val | BYT_LEVEL, reg); + else + writel(old_val & ~BYT_LEVEL, reg); + + spin_unlock_irqrestore(&vg->lock, flags); +} + +static int byt_gpio_direction_input(struct gpio_chip *chip, unsigned offset) +{ + struct byt_gpio *vg = container_of(chip, struct byt_gpio, chip); + void __iomem *reg = byt_gpio_reg(chip, offset, BYT_VAL_REG); + unsigned long flags; + u32 value; + + spin_lock_irqsave(&vg->lock, flags); + + value = readl(reg) | BYT_DIR_MASK; + value = value & (~BYT_INPUT_EN); /* active low */ + writel(value, reg); + + spin_unlock_irqrestore(&vg->lock, flags); + + return 0; +} + +static int byt_gpio_direction_output(struct gpio_chip *chip, + unsigned gpio, int value) +{ + struct byt_gpio *vg = container_of(chip, struct byt_gpio, chip); + void __iomem *reg = byt_gpio_reg(chip, gpio, BYT_VAL_REG); + unsigned long flags; + u32 reg_val; + + spin_lock_irqsave(&vg->lock, flags); + + reg_val = readl(reg) | (BYT_DIR_MASK | !!value); + reg_val &= ~(BYT_OUTPUT_EN | !value); + writel(reg_val, reg); + + spin_unlock_irqrestore(&vg->lock, flags); + + return 0; +} + +static void byt_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) +{ + struct byt_gpio *vg = container_of(chip, struct byt_gpio, chip); + int i; + unsigned long flags; + u32 conf0, val, offs; + + spin_lock_irqsave(&vg->lock, flags); + + for (i = 0; i < vg->chip.ngpio; i++) { + offs = vg->range->pins[i] * 16; + conf0 = readl(vg->reg_base + offs + BYT_CONF0_REG); + val = readl(vg->reg_base + offs + BYT_VAL_REG); + + seq_printf(s, + " gpio-%-3d %s %s %s pad-%-3d offset:0x%03x mux:%d %s%s%s\n", + i, + val & BYT_INPUT_EN ? " " : "in", + val & BYT_OUTPUT_EN ? " " : "out", + val & BYT_LEVEL ? "hi" : "lo", + vg->range->pins[i], offs, + conf0 & 0x7, + conf0 & BYT_TRIG_NEG ? "fall " : "", + conf0 & BYT_TRIG_POS ? "rise " : "", + conf0 & BYT_TRIG_LVL ? "lvl " : ""); + } + spin_unlock_irqrestore(&vg->lock, flags); +} + +static int byt_gpio_to_irq(struct gpio_chip *chip, unsigned offset) +{ + struct byt_gpio *vg = container_of(chip, struct byt_gpio, chip); + return irq_create_mapping(vg->domain, offset); +} + +static void byt_gpio_irq_handler(unsigned irq, struct irq_desc *desc) +{ + struct irq_data *data = irq_desc_get_irq_data(desc); + struct byt_gpio *vg = irq_data_get_irq_handler_data(data); + struct irq_chip *chip = irq_data_get_irq_chip(data); + u32 base, pin, mask; + void __iomem *reg; + u32 pending; + unsigned virq; + int looplimit = 0; + + /* check from GPIO controller which pin triggered the interrupt */ + for (base = 0; base < vg->chip.ngpio; base += 32) { + + reg = byt_gpio_reg(&vg->chip, base, BYT_INT_STAT_REG); + + while ((pending = readl(reg))) { + pin = __ffs(pending); + mask = BIT(pin); + /* Clear before handling so we can't lose an edge */ + writel(mask, reg); + + virq = irq_find_mapping(vg->domain, base + pin); + generic_handle_irq(virq); + + /* In case bios or user sets triggering incorretly a pin + * might remain in "interrupt triggered" state. + */ + if (looplimit++ > 32) { + dev_err(&vg->pdev->dev, + "Gpio %d interrupt flood, disabling\n", + base + pin); + + reg = byt_gpio_reg(&vg->chip, base + pin, + BYT_CONF0_REG); + mask = readl(reg); + mask &= ~(BYT_TRIG_NEG | BYT_TRIG_POS | + BYT_TRIG_LVL); + writel(mask, reg); + mask = readl(reg); /* flush */ + break; + } + } + } + chip->irq_eoi(data); +} + +static void byt_irq_unmask(struct irq_data *d) +{ +} + +static void byt_irq_mask(struct irq_data *d) +{ +} + +static struct irq_chip byt_irqchip = { + .name = "BYT-GPIO", + .irq_mask = byt_irq_mask, + .irq_unmask = byt_irq_unmask, + .irq_set_type = byt_irq_type, +}; + +static void byt_gpio_irq_init_hw(struct byt_gpio *vg) +{ + void __iomem *reg; + u32 base, value; + + /* clear interrupt status trigger registers */ + for (base = 0; base < vg->chip.ngpio; base += 32) { + reg = byt_gpio_reg(&vg->chip, base, BYT_INT_STAT_REG); + writel(0xffffffff, reg); + /* make sure trigger bits are cleared, if not then a pin + might be misconfigured in bios */ + value = readl(reg); + if (value) + dev_err(&vg->pdev->dev, + "GPIO interrupt error, pins misconfigured\n"); + } +} + +static int byt_gpio_irq_map(struct irq_domain *d, unsigned int virq, + irq_hw_number_t hw) +{ + struct byt_gpio *vg = d->host_data; + + irq_set_chip_and_handler_name(virq, &byt_irqchip, handle_simple_irq, + "demux"); + irq_set_chip_data(virq, vg); + irq_set_irq_type(virq, IRQ_TYPE_NONE); + + return 0; +} + +static const struct irq_domain_ops byt_gpio_irq_ops = { + .map = byt_gpio_irq_map, +}; + +static int byt_gpio_probe(struct platform_device *pdev) +{ + struct byt_gpio *vg; + struct gpio_chip *gc; + struct resource *mem_rc, *irq_rc; + struct device *dev = &pdev->dev; + struct acpi_device *acpi_dev; + struct pinctrl_gpio_range *range; + acpi_handle handle = ACPI_HANDLE(dev); + unsigned hwirq; + int ret; + + if (acpi_bus_get_device(handle, &acpi_dev)) + return -ENODEV; + + vg = devm_kzalloc(dev, sizeof(struct byt_gpio), GFP_KERNEL); + if (!vg) { + dev_err(&pdev->dev, "can't allocate byt_gpio chip data\n"); + return -ENOMEM; + } + + for (range = byt_ranges; range->name; range++) { + if (!strcmp(acpi_dev->pnp.unique_id, range->name)) { + vg->chip.ngpio = range->npins; + vg->range = range; + break; + } + } + + if (!vg->chip.ngpio || !vg->range) + return -ENODEV; + + vg->pdev = pdev; + platform_set_drvdata(pdev, vg); + + mem_rc = platform_get_resource(pdev, IORESOURCE_MEM, 0); + vg->reg_base = devm_ioremap_resource(dev, mem_rc); + if (IS_ERR(vg->reg_base)) + return PTR_ERR(vg->reg_base); + + spin_lock_init(&vg->lock); + + gc = &vg->chip; + gc->label = dev_name(&pdev->dev); + gc->owner = THIS_MODULE; + gc->request = byt_gpio_request; + gc->free = byt_gpio_free; + gc->direction_input = byt_gpio_direction_input; + gc->direction_output = byt_gpio_direction_output; + gc->get = byt_gpio_get; + gc->set = byt_gpio_set; + gc->dbg_show = byt_gpio_dbg_show; + gc->base = -1; + gc->can_sleep = 0; + gc->dev = dev; + + ret = gpiochip_add(gc); + if (ret) { + dev_err(&pdev->dev, "failed adding byt-gpio chip\n"); + return ret; + } + + /* set up interrupts */ + irq_rc = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + if (irq_rc && irq_rc->start) { + hwirq = irq_rc->start; + gc->to_irq = byt_gpio_to_irq; + + vg->domain = irq_domain_add_linear(NULL, gc->ngpio, + &byt_gpio_irq_ops, vg); + if (!vg->domain) + return -ENXIO; + + byt_gpio_irq_init_hw(vg); + + irq_set_handler_data(hwirq, vg); + irq_set_chained_handler(hwirq, byt_gpio_irq_handler); + + /* Register interrupt handlers for gpio signaled acpi events */ + acpi_gpiochip_request_interrupts(gc); + } + + pm_runtime_enable(dev); + + return 0; +} + +static int byt_gpio_runtime_suspend(struct device *dev) +{ + return 0; +} + +static int byt_gpio_runtime_resume(struct device *dev) +{ + return 0; +} + +static const struct dev_pm_ops byt_gpio_pm_ops = { + .runtime_suspend = byt_gpio_runtime_suspend, + .runtime_resume = byt_gpio_runtime_resume, +}; + +static const struct acpi_device_id byt_gpio_acpi_match[] = { + { "INT33B2", 0 }, + { } +}; +MODULE_DEVICE_TABLE(acpi, byt_gpio_acpi_match); + +static int byt_gpio_remove(struct platform_device *pdev) +{ + struct byt_gpio *vg = platform_get_drvdata(pdev); + int err; + pm_runtime_disable(&pdev->dev); + err = gpiochip_remove(&vg->chip); + if (err) + dev_warn(&pdev->dev, "failed to remove gpio_chip.\n"); + + return 0; +} + +static struct platform_driver byt_gpio_driver = { + .probe = byt_gpio_probe, + .remove = byt_gpio_remove, + .driver = { + .name = "byt_gpio", + .owner = THIS_MODULE, + .pm = &byt_gpio_pm_ops, + .acpi_match_table = ACPI_PTR(byt_gpio_acpi_match), + }, +}; + +static int __init byt_gpio_init(void) +{ + return platform_driver_register(&byt_gpio_driver); +} + +subsys_initcall(byt_gpio_init); |