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4a3a950ee9
A platform_driver does not need to set an owner, it will be populated by the driver core. Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
475 lines
13 KiB
C
475 lines
13 KiB
C
/*
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* GPIO controller driver for Intel Lynxpoint PCH chipset>
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* Copyright (c) 2012, Intel Corporation.
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*
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* Author: Mathias Nyman <mathias.nyman@linux.intel.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/bitops.h>
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#include <linux/interrupt.h>
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#include <linux/gpio.h>
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#include <linux/slab.h>
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#include <linux/acpi.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/io.h>
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/* LynxPoint chipset has support for 94 gpio pins */
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#define LP_NUM_GPIO 94
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/* Bitmapped register offsets */
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#define LP_ACPI_OWNED 0x00 /* Bitmap, set by bios, 0: pin reserved for ACPI */
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#define LP_GC 0x7C /* set APIC IRQ to IRQ14 or IRQ15 for all pins */
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#define LP_INT_STAT 0x80
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#define LP_INT_ENABLE 0x90
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/* Each pin has two 32 bit config registers, starting at 0x100 */
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#define LP_CONFIG1 0x100
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#define LP_CONFIG2 0x104
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/* LP_CONFIG1 reg bits */
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#define OUT_LVL_BIT BIT(31)
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#define IN_LVL_BIT BIT(30)
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#define TRIG_SEL_BIT BIT(4) /* 0: Edge, 1: Level */
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#define INT_INV_BIT BIT(3) /* Invert interrupt triggering */
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#define DIR_BIT BIT(2) /* 0: Output, 1: Input */
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#define USE_SEL_BIT BIT(0) /* 0: Native, 1: GPIO */
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/* LP_CONFIG2 reg bits */
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#define GPINDIS_BIT BIT(2) /* disable input sensing */
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#define GPIWP_BIT (BIT(0) | BIT(1)) /* weak pull options */
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struct lp_gpio {
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struct gpio_chip chip;
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struct platform_device *pdev;
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spinlock_t lock;
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unsigned long reg_base;
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};
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/*
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* Lynxpoint gpios are controlled through both bitmapped registers and
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* per gpio specific registers. The bitmapped registers are in chunks of
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* 3 x 32bit registers to cover all 94 gpios
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*
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* per gpio specific registers consist of two 32bit registers per gpio
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* (LP_CONFIG1 and LP_CONFIG2), with 94 gpios there's a total of
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* 188 config registes.
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*
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* A simplified view of the register layout look like this:
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*
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* LP_ACPI_OWNED[31:0] gpio ownerships for gpios 0-31 (bitmapped registers)
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* LP_ACPI_OWNED[63:32] gpio ownerships for gpios 32-63
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* LP_ACPI_OWNED[94:64] gpio ownerships for gpios 63-94
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* ...
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* LP_INT_ENABLE[31:0] ...
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* LP_INT_ENABLE[63:31] ...
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* LP_INT_ENABLE[94:64] ...
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* LP0_CONFIG1 (gpio 0) config1 reg for gpio 0 (per gpio registers)
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* LP0_CONFIG2 (gpio 0) config2 reg for gpio 0
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* LP1_CONFIG1 (gpio 1) config1 reg for gpio 1
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* LP1_CONFIG2 (gpio 1) config2 reg for gpio 1
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* LP2_CONFIG1 (gpio 2) ...
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* LP2_CONFIG2 (gpio 2) ...
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* ...
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* LP94_CONFIG1 (gpio 94) ...
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* LP94_CONFIG2 (gpio 94) ...
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*/
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static unsigned long lp_gpio_reg(struct gpio_chip *chip, unsigned offset,
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int reg)
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{
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struct lp_gpio *lg = container_of(chip, struct lp_gpio, chip);
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int reg_offset;
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if (reg == LP_CONFIG1 || reg == LP_CONFIG2)
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/* per gpio specific config registers */
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reg_offset = offset * 8;
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else
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/* bitmapped registers */
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reg_offset = (offset / 32) * 4;
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return lg->reg_base + reg + reg_offset;
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}
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static int lp_gpio_request(struct gpio_chip *chip, unsigned offset)
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{
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struct lp_gpio *lg = container_of(chip, struct lp_gpio, chip);
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unsigned long reg = lp_gpio_reg(chip, offset, LP_CONFIG1);
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unsigned long conf2 = lp_gpio_reg(chip, offset, LP_CONFIG2);
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unsigned long acpi_use = lp_gpio_reg(chip, offset, LP_ACPI_OWNED);
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pm_runtime_get(&lg->pdev->dev); /* should we put if failed */
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/* Fail if BIOS reserved pin for ACPI use */
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if (!(inl(acpi_use) & BIT(offset % 32))) {
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dev_err(&lg->pdev->dev, "gpio %d reserved for ACPI\n", offset);
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return -EBUSY;
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}
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/* Fail if pin is in alternate function mode (not GPIO mode) */
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if (!(inl(reg) & USE_SEL_BIT))
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return -ENODEV;
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/* enable input sensing */
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outl(inl(conf2) & ~GPINDIS_BIT, conf2);
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return 0;
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}
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static void lp_gpio_free(struct gpio_chip *chip, unsigned offset)
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{
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struct lp_gpio *lg = container_of(chip, struct lp_gpio, chip);
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unsigned long conf2 = lp_gpio_reg(chip, offset, LP_CONFIG2);
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/* disable input sensing */
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outl(inl(conf2) | GPINDIS_BIT, conf2);
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pm_runtime_put(&lg->pdev->dev);
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}
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static int lp_irq_type(struct irq_data *d, unsigned type)
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{
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct lp_gpio *lg = container_of(gc, struct lp_gpio, chip);
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u32 hwirq = irqd_to_hwirq(d);
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unsigned long flags;
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u32 value;
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unsigned long reg = lp_gpio_reg(&lg->chip, hwirq, LP_CONFIG1);
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if (hwirq >= lg->chip.ngpio)
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return -EINVAL;
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spin_lock_irqsave(&lg->lock, flags);
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value = inl(reg);
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/* set both TRIG_SEL and INV bits to 0 for rising edge */
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if (type & IRQ_TYPE_EDGE_RISING)
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value &= ~(TRIG_SEL_BIT | INT_INV_BIT);
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/* TRIG_SEL bit 0, INV bit 1 for falling edge */
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if (type & IRQ_TYPE_EDGE_FALLING)
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value = (value | INT_INV_BIT) & ~TRIG_SEL_BIT;
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/* TRIG_SEL bit 1, INV bit 0 for level low */
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if (type & IRQ_TYPE_LEVEL_LOW)
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value = (value | TRIG_SEL_BIT) & ~INT_INV_BIT;
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/* TRIG_SEL bit 1, INV bit 1 for level high */
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if (type & IRQ_TYPE_LEVEL_HIGH)
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value |= TRIG_SEL_BIT | INT_INV_BIT;
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outl(value, reg);
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spin_unlock_irqrestore(&lg->lock, flags);
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return 0;
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}
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static int lp_gpio_get(struct gpio_chip *chip, unsigned offset)
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{
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unsigned long reg = lp_gpio_reg(chip, offset, LP_CONFIG1);
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return !!(inl(reg) & IN_LVL_BIT);
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}
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static void lp_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
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{
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struct lp_gpio *lg = container_of(chip, struct lp_gpio, chip);
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unsigned long reg = lp_gpio_reg(chip, offset, LP_CONFIG1);
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unsigned long flags;
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spin_lock_irqsave(&lg->lock, flags);
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if (value)
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outl(inl(reg) | OUT_LVL_BIT, reg);
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else
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outl(inl(reg) & ~OUT_LVL_BIT, reg);
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spin_unlock_irqrestore(&lg->lock, flags);
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}
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static int lp_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
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{
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struct lp_gpio *lg = container_of(chip, struct lp_gpio, chip);
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unsigned long reg = lp_gpio_reg(chip, offset, LP_CONFIG1);
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unsigned long flags;
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spin_lock_irqsave(&lg->lock, flags);
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outl(inl(reg) | DIR_BIT, reg);
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spin_unlock_irqrestore(&lg->lock, flags);
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return 0;
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}
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static int lp_gpio_direction_output(struct gpio_chip *chip,
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unsigned offset, int value)
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{
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struct lp_gpio *lg = container_of(chip, struct lp_gpio, chip);
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unsigned long reg = lp_gpio_reg(chip, offset, LP_CONFIG1);
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unsigned long flags;
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lp_gpio_set(chip, offset, value);
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spin_lock_irqsave(&lg->lock, flags);
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outl(inl(reg) & ~DIR_BIT, reg);
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spin_unlock_irqrestore(&lg->lock, flags);
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return 0;
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}
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static void lp_gpio_irq_handler(unsigned hwirq, struct irq_desc *desc)
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{
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struct irq_data *data = irq_desc_get_irq_data(desc);
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struct gpio_chip *gc = irq_desc_get_handler_data(desc);
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struct lp_gpio *lg = container_of(gc, struct lp_gpio, chip);
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struct irq_chip *chip = irq_data_get_irq_chip(data);
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u32 base, pin, mask;
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unsigned long reg, ena, pending;
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/* check from GPIO controller which pin triggered the interrupt */
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for (base = 0; base < lg->chip.ngpio; base += 32) {
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reg = lp_gpio_reg(&lg->chip, base, LP_INT_STAT);
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ena = lp_gpio_reg(&lg->chip, base, LP_INT_ENABLE);
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while ((pending = (inl(reg) & inl(ena)))) {
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unsigned irq;
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pin = __ffs(pending);
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mask = BIT(pin);
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/* Clear before handling so we don't lose an edge */
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outl(mask, reg);
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irq = irq_find_mapping(lg->chip.irqdomain, base + pin);
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generic_handle_irq(irq);
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}
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}
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chip->irq_eoi(data);
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}
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static void lp_irq_unmask(struct irq_data *d)
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{
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}
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static void lp_irq_mask(struct irq_data *d)
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{
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}
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static void lp_irq_enable(struct irq_data *d)
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{
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct lp_gpio *lg = container_of(gc, struct lp_gpio, chip);
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u32 hwirq = irqd_to_hwirq(d);
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unsigned long reg = lp_gpio_reg(&lg->chip, hwirq, LP_INT_ENABLE);
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unsigned long flags;
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spin_lock_irqsave(&lg->lock, flags);
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outl(inl(reg) | BIT(hwirq % 32), reg);
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spin_unlock_irqrestore(&lg->lock, flags);
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}
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static void lp_irq_disable(struct irq_data *d)
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{
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct lp_gpio *lg = container_of(gc, struct lp_gpio, chip);
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u32 hwirq = irqd_to_hwirq(d);
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unsigned long reg = lp_gpio_reg(&lg->chip, hwirq, LP_INT_ENABLE);
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unsigned long flags;
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spin_lock_irqsave(&lg->lock, flags);
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outl(inl(reg) & ~BIT(hwirq % 32), reg);
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spin_unlock_irqrestore(&lg->lock, flags);
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}
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static struct irq_chip lp_irqchip = {
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.name = "LP-GPIO",
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.irq_mask = lp_irq_mask,
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.irq_unmask = lp_irq_unmask,
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.irq_enable = lp_irq_enable,
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.irq_disable = lp_irq_disable,
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.irq_set_type = lp_irq_type,
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.flags = IRQCHIP_SKIP_SET_WAKE,
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};
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static void lp_gpio_irq_init_hw(struct lp_gpio *lg)
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{
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unsigned long reg;
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unsigned base;
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for (base = 0; base < lg->chip.ngpio; base += 32) {
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/* disable gpio pin interrupts */
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reg = lp_gpio_reg(&lg->chip, base, LP_INT_ENABLE);
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outl(0, reg);
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/* Clear interrupt status register */
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reg = lp_gpio_reg(&lg->chip, base, LP_INT_STAT);
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outl(0xffffffff, reg);
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}
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}
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static int lp_gpio_probe(struct platform_device *pdev)
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{
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struct lp_gpio *lg;
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struct gpio_chip *gc;
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struct resource *io_rc, *irq_rc;
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struct device *dev = &pdev->dev;
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unsigned long reg_len;
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int ret = -ENODEV;
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lg = devm_kzalloc(dev, sizeof(struct lp_gpio), GFP_KERNEL);
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if (!lg)
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return -ENOMEM;
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lg->pdev = pdev;
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platform_set_drvdata(pdev, lg);
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io_rc = platform_get_resource(pdev, IORESOURCE_IO, 0);
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irq_rc = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
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if (!io_rc) {
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dev_err(dev, "missing IO resources\n");
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return -EINVAL;
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}
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lg->reg_base = io_rc->start;
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reg_len = resource_size(io_rc);
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if (!devm_request_region(dev, lg->reg_base, reg_len, "lp-gpio")) {
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dev_err(dev, "failed requesting IO region 0x%x\n",
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(unsigned int)lg->reg_base);
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return -EBUSY;
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}
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spin_lock_init(&lg->lock);
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gc = &lg->chip;
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gc->label = dev_name(dev);
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gc->owner = THIS_MODULE;
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gc->request = lp_gpio_request;
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gc->free = lp_gpio_free;
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gc->direction_input = lp_gpio_direction_input;
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gc->direction_output = lp_gpio_direction_output;
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gc->get = lp_gpio_get;
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gc->set = lp_gpio_set;
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gc->base = -1;
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gc->ngpio = LP_NUM_GPIO;
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gc->can_sleep = false;
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gc->dev = dev;
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ret = gpiochip_add(gc);
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if (ret) {
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dev_err(dev, "failed adding lp-gpio chip\n");
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return ret;
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}
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/* set up interrupts */
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if (irq_rc && irq_rc->start) {
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lp_gpio_irq_init_hw(lg);
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ret = gpiochip_irqchip_add(gc, &lp_irqchip, 0,
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handle_simple_irq, IRQ_TYPE_NONE);
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if (ret) {
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dev_err(dev, "failed to add irqchip\n");
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gpiochip_remove(gc);
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return ret;
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}
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gpiochip_set_chained_irqchip(gc, &lp_irqchip,
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(unsigned)irq_rc->start,
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lp_gpio_irq_handler);
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}
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pm_runtime_enable(dev);
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return 0;
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}
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static int lp_gpio_runtime_suspend(struct device *dev)
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{
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return 0;
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}
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static int lp_gpio_runtime_resume(struct device *dev)
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{
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return 0;
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}
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static int lp_gpio_resume(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct lp_gpio *lg = platform_get_drvdata(pdev);
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unsigned long reg;
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int i;
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/* on some hardware suspend clears input sensing, re-enable it here */
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for (i = 0; i < lg->chip.ngpio; i++) {
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if (gpiochip_is_requested(&lg->chip, i) != NULL) {
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reg = lp_gpio_reg(&lg->chip, i, LP_CONFIG2);
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outl(inl(reg) & ~GPINDIS_BIT, reg);
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}
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}
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return 0;
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}
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static const struct dev_pm_ops lp_gpio_pm_ops = {
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.runtime_suspend = lp_gpio_runtime_suspend,
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.runtime_resume = lp_gpio_runtime_resume,
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.resume = lp_gpio_resume,
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};
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static const struct acpi_device_id lynxpoint_gpio_acpi_match[] = {
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{ "INT33C7", 0 },
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{ "INT3437", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(acpi, lynxpoint_gpio_acpi_match);
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static int lp_gpio_remove(struct platform_device *pdev)
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{
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struct lp_gpio *lg = platform_get_drvdata(pdev);
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pm_runtime_disable(&pdev->dev);
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gpiochip_remove(&lg->chip);
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return 0;
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}
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static struct platform_driver lp_gpio_driver = {
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.probe = lp_gpio_probe,
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.remove = lp_gpio_remove,
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.driver = {
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.name = "lp_gpio",
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.pm = &lp_gpio_pm_ops,
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.acpi_match_table = ACPI_PTR(lynxpoint_gpio_acpi_match),
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},
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};
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static int __init lp_gpio_init(void)
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{
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return platform_driver_register(&lp_gpio_driver);
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}
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static void __exit lp_gpio_exit(void)
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{
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platform_driver_unregister(&lp_gpio_driver);
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}
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subsys_initcall(lp_gpio_init);
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module_exit(lp_gpio_exit);
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MODULE_AUTHOR("Mathias Nyman (Intel)");
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MODULE_DESCRIPTION("GPIO interface for Intel Lynxpoint");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:lp_gpio");
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