help
Say Y here to enable the at91 pinctrl driver
-config PINCTRL_BAYTRAIL
- bool "Intel Baytrail GPIO pin control"
- depends on GPIOLIB && ACPI && X86
- select GPIOLIB_IRQCHIP
- help
- driver for memory mapped GPIO functionality on Intel Baytrail
- platforms. Supports 3 banks with 102, 28 and 44 gpios.
- Most pins are usually muxed to some other functionality by firmware,
- so only a small amount is available for gpio use.
-
- Requires ACPI device enumeration code to set up a platform device.
-
config PINCTRL_BCM2835
bool
select PINMUX
source "drivers/pinctrl/berlin/Kconfig"
source "drivers/pinctrl/freescale/Kconfig"
+source "drivers/pinctrl/intel/Kconfig"
source "drivers/pinctrl/mvebu/Kconfig"
source "drivers/pinctrl/nomadik/Kconfig"
source "drivers/pinctrl/qcom/Kconfig"
obj-$(CONFIG_PINCTRL_BF60x) += pinctrl-adi2-bf60x.o
obj-$(CONFIG_PINCTRL_AT91) += pinctrl-at91.o
obj-$(CONFIG_PINCTRL_BCM2835) += pinctrl-bcm2835.o
-obj-$(CONFIG_PINCTRL_BAYTRAIL) += pinctrl-baytrail.o
obj-$(CONFIG_PINCTRL_BCM281XX) += pinctrl-bcm281xx.o
obj-$(CONFIG_PINCTRL_FALCON) += pinctrl-falcon.o
obj-$(CONFIG_PINCTRL_PALMAS) += pinctrl-palmas.o
obj-$(CONFIG_ARCH_BERLIN) += berlin/
obj-y += freescale/
+obj-$(CONFIG_X86) += intel/
obj-$(CONFIG_PLAT_ORION) += mvebu/
obj-y += nomadik/
obj-$(CONFIG_ARCH_QCOM) += qcom/
--- /dev/null
+#
+# Intel pin control drivers
+#
+
+config PINCTRL_BAYTRAIL
+ bool "Intel Baytrail GPIO pin control"
+ depends on GPIOLIB && ACPI
+ select GPIOLIB_IRQCHIP
+ help
+ driver for memory mapped GPIO functionality on Intel Baytrail
+ platforms. Supports 3 banks with 102, 28 and 44 gpios.
+ Most pins are usually muxed to some other functionality by firmware,
+ so only a small amount is available for gpio use.
+
+ Requires ACPI device enumeration code to set up a platform device.
--- /dev/null
+# Intel pin control drivers
+
+obj-$(CONFIG_PINCTRL_BAYTRAIL) += pinctrl-baytrail.o
--- /dev/null
+/*
+ * 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/gpio.h>
+#include <linux/acpi.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_IODEN BIT(31)
+#define BYT_DIRECT_IRQ_EN BIT(27)
+#define BYT_TRIG_NEG BIT(26)
+#define BYT_TRIG_POS BIT(25)
+#define BYT_TRIG_LVL BIT(24)
+#define BYT_PULL_STR_SHIFT 9
+#define BYT_PULL_STR_MASK (3 << BYT_PULL_STR_SHIFT)
+#define BYT_PULL_STR_2K (0 << BYT_PULL_STR_SHIFT)
+#define BYT_PULL_STR_10K (1 << BYT_PULL_STR_SHIFT)
+#define BYT_PULL_STR_20K (2 << BYT_PULL_STR_SHIFT)
+#define BYT_PULL_STR_40K (3 << BYT_PULL_STR_SHIFT)
+#define BYT_PULL_ASSIGN_SHIFT 7
+#define BYT_PULL_ASSIGN_MASK (3 << BYT_PULL_ASSIGN_SHIFT)
+#define BYT_PULL_ASSIGN_UP (1 << BYT_PULL_ASSIGN_SHIFT)
+#define BYT_PULL_ASSIGN_DOWN (2 << BYT_PULL_ASSIGN_SHIFT)
+#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
+
+#define BYT_SCORE_ACPI_UID "1"
+#define BYT_NCORE_ACPI_UID "2"
+#define BYT_SUS_ACPI_UID "3"
+
+/*
+ * 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 = BYT_SCORE_ACPI_UID, /* match with acpi _UID in probe */
+ .npins = BYT_NGPIO_SCORE,
+ .pins = score_pins,
+ },
+ {
+ .name = BYT_NCORE_ACPI_UID,
+ .npins = BYT_NGPIO_NCORE,
+ .pins = ncore_pins,
+ },
+ {
+ .name = BYT_SUS_ACPI_UID,
+ .npins = BYT_NGPIO_SUS,
+ .pins = sus_pins,
+ },
+ {
+ },
+};
+
+struct byt_gpio {
+ struct gpio_chip chip;
+ struct platform_device *pdev;
+ spinlock_t lock;
+ void __iomem *reg_base;
+ struct pinctrl_gpio_range *range;
+};
+
+#define to_byt_gpio(c) container_of(c, struct byt_gpio, chip)
+
+static void __iomem *byt_gpio_reg(struct gpio_chip *chip, unsigned offset,
+ int reg)
+{
+ struct byt_gpio *vg = to_byt_gpio(chip);
+ u32 reg_offset;
+
+ if (reg == BYT_INT_STAT_REG)
+ reg_offset = (offset / 32) * 4;
+ else
+ reg_offset = vg->range->pins[offset] * 16;
+
+ return vg->reg_base + reg_offset + reg;
+}
+
+static bool is_special_pin(struct byt_gpio *vg, unsigned offset)
+{
+ /* SCORE pin 92-93 */
+ if (!strcmp(vg->range->name, BYT_SCORE_ACPI_UID) &&
+ offset >= 92 && offset <= 93)
+ return true;
+
+ /* SUS pin 11-21 */
+ if (!strcmp(vg->range->name, BYT_SUS_ACPI_UID) &&
+ offset >= 11 && offset <= 21)
+ return true;
+
+ return false;
+}
+
+static int byt_gpio_request(struct gpio_chip *chip, unsigned offset)
+{
+ struct byt_gpio *vg = to_byt_gpio(chip);
+ void __iomem *reg = byt_gpio_reg(chip, offset, BYT_CONF0_REG);
+ u32 value;
+ bool special;
+
+ /*
+ * In most cases, func pin mux 000 means GPIO function.
+ * But, some pins may have func pin mux 001 represents
+ * GPIO function. Only allow user to export pin with
+ * func pin mux preset as GPIO function by BIOS/FW.
+ */
+ value = readl(reg) & BYT_PIN_MUX;
+ special = is_special_pin(vg, offset);
+ if ((special && value != 1) || (!special && value)) {
+ dev_err(&vg->pdev->dev,
+ "pin %u cannot be used as GPIO.\n", offset);
+ return -EINVAL;
+ }
+
+ pm_runtime_get(&vg->pdev->dev);
+
+ return 0;
+}
+
+static void byt_gpio_free(struct gpio_chip *chip, unsigned offset)
+{
+ struct byt_gpio *vg = to_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 = to_byt_gpio(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 = to_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 = to_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 &= ~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 = to_byt_gpio(chip);
+ void __iomem *conf_reg = byt_gpio_reg(chip, gpio, BYT_CONF0_REG);
+ void __iomem *reg = byt_gpio_reg(chip, gpio, BYT_VAL_REG);
+ unsigned long flags;
+ u32 reg_val;
+
+ spin_lock_irqsave(&vg->lock, flags);
+
+ /*
+ * Before making any direction modifications, do a check if gpio
+ * is set for direct IRQ. On baytrail, setting GPIO to output does
+ * not make sense, so let's at least warn the caller before they shoot
+ * themselves in the foot.
+ */
+ WARN(readl(conf_reg) & BYT_DIRECT_IRQ_EN,
+ "Potential Error: Setting GPIO with direct_irq_en to output");
+
+ reg_val = readl(reg) | BYT_DIR_MASK;
+ reg_val &= ~BYT_OUTPUT_EN;
+
+ if (value)
+ writel(reg_val | BYT_LEVEL, reg);
+ else
+ writel(reg_val & ~BYT_LEVEL, 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 = to_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++) {
+ const char *pull_str = NULL;
+ const char *pull = NULL;
+ const char *label;
+ offs = vg->range->pins[i] * 16;
+ conf0 = readl(vg->reg_base + offs + BYT_CONF0_REG);
+ val = readl(vg->reg_base + offs + BYT_VAL_REG);
+
+ label = gpiochip_is_requested(chip, i);
+ if (!label)
+ label = "Unrequested";
+
+ switch (conf0 & BYT_PULL_ASSIGN_MASK) {
+ case BYT_PULL_ASSIGN_UP:
+ pull = "up";
+ break;
+ case BYT_PULL_ASSIGN_DOWN:
+ pull = "down";
+ break;
+ }
+
+ switch (conf0 & BYT_PULL_STR_MASK) {
+ case BYT_PULL_STR_2K:
+ pull_str = "2k";
+ break;
+ case BYT_PULL_STR_10K:
+ pull_str = "10k";
+ break;
+ case BYT_PULL_STR_20K:
+ pull_str = "20k";
+ break;
+ case BYT_PULL_STR_40K:
+ pull_str = "40k";
+ break;
+ }
+
+ seq_printf(s,
+ " gpio-%-3d (%-20.20s) %s %s %s pad-%-3d offset:0x%03x mux:%d %s%s%s",
+ i,
+ label,
+ 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 ? " level" : " ");
+
+ if (pull && pull_str)
+ seq_printf(s, " %-4s %-3s", pull, pull_str);
+ else
+ seq_puts(s, " ");
+
+ if (conf0 & BYT_IODEN)
+ seq_puts(s, " open-drain");
+
+ seq_puts(s, "\n");
+ }
+ spin_unlock_irqrestore(&vg->lock, flags);
+}
+
+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 = to_byt_gpio(irq_desc_get_handler_data(desc));
+ 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->chip.irqdomain, 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,
+ .flags = IRQCHIP_SKIP_SET_WAKE,
+};
+
+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_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);
+ 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 = false;
+ 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) {
+ byt_gpio_irq_init_hw(vg);
+ ret = gpiochip_irqchip_add(gc, &byt_irqchip, 0,
+ handle_simple_irq, IRQ_TYPE_NONE);
+ if (ret) {
+ dev_err(dev, "failed to add irqchip\n");
+ gpiochip_remove(gc);
+ return ret;
+ }
+
+ gpiochip_set_chained_irqchip(gc, &byt_irqchip,
+ (unsigned)irq_rc->start,
+ byt_gpio_irq_handler);
+ }
+
+ 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 },
+ { "INT33FC", 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);
+
+ pm_runtime_disable(&pdev->dev);
+ gpiochip_remove(&vg->chip);
+
+ 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);
+
+static void __exit byt_gpio_exit(void)
+{
+ platform_driver_unregister(&byt_gpio_driver);
+}
+module_exit(byt_gpio_exit);
+++ /dev/null
-/*
- * 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/gpio.h>
-#include <linux/acpi.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_IODEN BIT(31)
-#define BYT_DIRECT_IRQ_EN BIT(27)
-#define BYT_TRIG_NEG BIT(26)
-#define BYT_TRIG_POS BIT(25)
-#define BYT_TRIG_LVL BIT(24)
-#define BYT_PULL_STR_SHIFT 9
-#define BYT_PULL_STR_MASK (3 << BYT_PULL_STR_SHIFT)
-#define BYT_PULL_STR_2K (0 << BYT_PULL_STR_SHIFT)
-#define BYT_PULL_STR_10K (1 << BYT_PULL_STR_SHIFT)
-#define BYT_PULL_STR_20K (2 << BYT_PULL_STR_SHIFT)
-#define BYT_PULL_STR_40K (3 << BYT_PULL_STR_SHIFT)
-#define BYT_PULL_ASSIGN_SHIFT 7
-#define BYT_PULL_ASSIGN_MASK (3 << BYT_PULL_ASSIGN_SHIFT)
-#define BYT_PULL_ASSIGN_UP (1 << BYT_PULL_ASSIGN_SHIFT)
-#define BYT_PULL_ASSIGN_DOWN (2 << BYT_PULL_ASSIGN_SHIFT)
-#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
-
-#define BYT_SCORE_ACPI_UID "1"
-#define BYT_NCORE_ACPI_UID "2"
-#define BYT_SUS_ACPI_UID "3"
-
-/*
- * 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 = BYT_SCORE_ACPI_UID, /* match with acpi _UID in probe */
- .npins = BYT_NGPIO_SCORE,
- .pins = score_pins,
- },
- {
- .name = BYT_NCORE_ACPI_UID,
- .npins = BYT_NGPIO_NCORE,
- .pins = ncore_pins,
- },
- {
- .name = BYT_SUS_ACPI_UID,
- .npins = BYT_NGPIO_SUS,
- .pins = sus_pins,
- },
- {
- },
-};
-
-struct byt_gpio {
- struct gpio_chip chip;
- struct platform_device *pdev;
- spinlock_t lock;
- void __iomem *reg_base;
- struct pinctrl_gpio_range *range;
-};
-
-#define to_byt_gpio(c) container_of(c, struct byt_gpio, chip)
-
-static void __iomem *byt_gpio_reg(struct gpio_chip *chip, unsigned offset,
- int reg)
-{
- struct byt_gpio *vg = to_byt_gpio(chip);
- u32 reg_offset;
-
- if (reg == BYT_INT_STAT_REG)
- reg_offset = (offset / 32) * 4;
- else
- reg_offset = vg->range->pins[offset] * 16;
-
- return vg->reg_base + reg_offset + reg;
-}
-
-static bool is_special_pin(struct byt_gpio *vg, unsigned offset)
-{
- /* SCORE pin 92-93 */
- if (!strcmp(vg->range->name, BYT_SCORE_ACPI_UID) &&
- offset >= 92 && offset <= 93)
- return true;
-
- /* SUS pin 11-21 */
- if (!strcmp(vg->range->name, BYT_SUS_ACPI_UID) &&
- offset >= 11 && offset <= 21)
- return true;
-
- return false;
-}
-
-static int byt_gpio_request(struct gpio_chip *chip, unsigned offset)
-{
- struct byt_gpio *vg = to_byt_gpio(chip);
- void __iomem *reg = byt_gpio_reg(chip, offset, BYT_CONF0_REG);
- u32 value;
- bool special;
-
- /*
- * In most cases, func pin mux 000 means GPIO function.
- * But, some pins may have func pin mux 001 represents
- * GPIO function. Only allow user to export pin with
- * func pin mux preset as GPIO function by BIOS/FW.
- */
- value = readl(reg) & BYT_PIN_MUX;
- special = is_special_pin(vg, offset);
- if ((special && value != 1) || (!special && value)) {
- dev_err(&vg->pdev->dev,
- "pin %u cannot be used as GPIO.\n", offset);
- return -EINVAL;
- }
-
- pm_runtime_get(&vg->pdev->dev);
-
- return 0;
-}
-
-static void byt_gpio_free(struct gpio_chip *chip, unsigned offset)
-{
- struct byt_gpio *vg = to_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 = to_byt_gpio(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 = to_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 = to_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 &= ~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 = to_byt_gpio(chip);
- void __iomem *conf_reg = byt_gpio_reg(chip, gpio, BYT_CONF0_REG);
- void __iomem *reg = byt_gpio_reg(chip, gpio, BYT_VAL_REG);
- unsigned long flags;
- u32 reg_val;
-
- spin_lock_irqsave(&vg->lock, flags);
-
- /*
- * Before making any direction modifications, do a check if gpio
- * is set for direct IRQ. On baytrail, setting GPIO to output does
- * not make sense, so let's at least warn the caller before they shoot
- * themselves in the foot.
- */
- WARN(readl(conf_reg) & BYT_DIRECT_IRQ_EN,
- "Potential Error: Setting GPIO with direct_irq_en to output");
-
- reg_val = readl(reg) | BYT_DIR_MASK;
- reg_val &= ~BYT_OUTPUT_EN;
-
- if (value)
- writel(reg_val | BYT_LEVEL, reg);
- else
- writel(reg_val & ~BYT_LEVEL, 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 = to_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++) {
- const char *pull_str = NULL;
- const char *pull = NULL;
- const char *label;
- offs = vg->range->pins[i] * 16;
- conf0 = readl(vg->reg_base + offs + BYT_CONF0_REG);
- val = readl(vg->reg_base + offs + BYT_VAL_REG);
-
- label = gpiochip_is_requested(chip, i);
- if (!label)
- label = "Unrequested";
-
- switch (conf0 & BYT_PULL_ASSIGN_MASK) {
- case BYT_PULL_ASSIGN_UP:
- pull = "up";
- break;
- case BYT_PULL_ASSIGN_DOWN:
- pull = "down";
- break;
- }
-
- switch (conf0 & BYT_PULL_STR_MASK) {
- case BYT_PULL_STR_2K:
- pull_str = "2k";
- break;
- case BYT_PULL_STR_10K:
- pull_str = "10k";
- break;
- case BYT_PULL_STR_20K:
- pull_str = "20k";
- break;
- case BYT_PULL_STR_40K:
- pull_str = "40k";
- break;
- }
-
- seq_printf(s,
- " gpio-%-3d (%-20.20s) %s %s %s pad-%-3d offset:0x%03x mux:%d %s%s%s",
- i,
- label,
- 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 ? " level" : " ");
-
- if (pull && pull_str)
- seq_printf(s, " %-4s %-3s", pull, pull_str);
- else
- seq_puts(s, " ");
-
- if (conf0 & BYT_IODEN)
- seq_puts(s, " open-drain");
-
- seq_puts(s, "\n");
- }
- spin_unlock_irqrestore(&vg->lock, flags);
-}
-
-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 = to_byt_gpio(irq_desc_get_handler_data(desc));
- 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->chip.irqdomain, 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,
- .flags = IRQCHIP_SKIP_SET_WAKE,
-};
-
-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_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);
- 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 = false;
- 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) {
- byt_gpio_irq_init_hw(vg);
- ret = gpiochip_irqchip_add(gc, &byt_irqchip, 0,
- handle_simple_irq, IRQ_TYPE_NONE);
- if (ret) {
- dev_err(dev, "failed to add irqchip\n");
- gpiochip_remove(gc);
- return ret;
- }
-
- gpiochip_set_chained_irqchip(gc, &byt_irqchip,
- (unsigned)irq_rc->start,
- byt_gpio_irq_handler);
- }
-
- 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 },
- { "INT33FC", 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);
-
- pm_runtime_disable(&pdev->dev);
- gpiochip_remove(&vg->chip);
-
- 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);
-
-static void __exit byt_gpio_exit(void)
-{
- platform_driver_unregister(&byt_gpio_driver);
-}
-module_exit(byt_gpio_exit);
projects / mirror_ubuntu-artful-kernel.git / commitdiff