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6173e56f76
Prevent gpiolib from messing with the irqchip by advertising the irq_chip structure as immutable, making it const, and adding the various calls that gpiolib relies upon. Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20220419141846.598305-9-maz@kernel.org
1109 lines
29 KiB
C
1109 lines
29 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* GPIO driver for AMD
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*
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* Copyright (c) 2014,2015 AMD Corporation.
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* Authors: Ken Xue <Ken.Xue@amd.com>
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* Wu, Jeff <Jeff.Wu@amd.com>
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*
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* Contact Information: Nehal Shah <Nehal-bakulchandra.Shah@amd.com>
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* Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
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*/
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#include <linux/err.h>
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#include <linux/bug.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/compiler.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/log2.h>
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#include <linux/io.h>
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#include <linux/gpio/driver.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/mutex.h>
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#include <linux/acpi.h>
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#include <linux/seq_file.h>
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#include <linux/interrupt.h>
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#include <linux/list.h>
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#include <linux/bitops.h>
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#include <linux/pinctrl/pinconf.h>
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#include <linux/pinctrl/pinconf-generic.h>
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#include "core.h"
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#include "pinctrl-utils.h"
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#include "pinctrl-amd.h"
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static int amd_gpio_get_direction(struct gpio_chip *gc, unsigned offset)
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{
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unsigned long flags;
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u32 pin_reg;
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struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
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raw_spin_lock_irqsave(&gpio_dev->lock, flags);
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pin_reg = readl(gpio_dev->base + offset * 4);
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raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
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if (pin_reg & BIT(OUTPUT_ENABLE_OFF))
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return GPIO_LINE_DIRECTION_OUT;
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return GPIO_LINE_DIRECTION_IN;
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}
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static int amd_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
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{
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unsigned long flags;
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u32 pin_reg;
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struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
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raw_spin_lock_irqsave(&gpio_dev->lock, flags);
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pin_reg = readl(gpio_dev->base + offset * 4);
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pin_reg &= ~BIT(OUTPUT_ENABLE_OFF);
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writel(pin_reg, gpio_dev->base + offset * 4);
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raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
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return 0;
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}
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static int amd_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
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int value)
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{
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u32 pin_reg;
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unsigned long flags;
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struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
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raw_spin_lock_irqsave(&gpio_dev->lock, flags);
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pin_reg = readl(gpio_dev->base + offset * 4);
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pin_reg |= BIT(OUTPUT_ENABLE_OFF);
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if (value)
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pin_reg |= BIT(OUTPUT_VALUE_OFF);
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else
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pin_reg &= ~BIT(OUTPUT_VALUE_OFF);
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writel(pin_reg, gpio_dev->base + offset * 4);
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raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
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return 0;
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}
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static int amd_gpio_get_value(struct gpio_chip *gc, unsigned offset)
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{
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u32 pin_reg;
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unsigned long flags;
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struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
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raw_spin_lock_irqsave(&gpio_dev->lock, flags);
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pin_reg = readl(gpio_dev->base + offset * 4);
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raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
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return !!(pin_reg & BIT(PIN_STS_OFF));
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}
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static void amd_gpio_set_value(struct gpio_chip *gc, unsigned offset, int value)
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{
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u32 pin_reg;
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unsigned long flags;
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struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
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raw_spin_lock_irqsave(&gpio_dev->lock, flags);
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pin_reg = readl(gpio_dev->base + offset * 4);
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if (value)
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pin_reg |= BIT(OUTPUT_VALUE_OFF);
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else
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pin_reg &= ~BIT(OUTPUT_VALUE_OFF);
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writel(pin_reg, gpio_dev->base + offset * 4);
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raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
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}
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static int amd_gpio_set_debounce(struct gpio_chip *gc, unsigned offset,
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unsigned debounce)
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{
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u32 time;
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u32 pin_reg;
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int ret = 0;
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unsigned long flags;
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struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
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raw_spin_lock_irqsave(&gpio_dev->lock, flags);
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pin_reg = readl(gpio_dev->base + offset * 4);
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if (debounce) {
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pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF;
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pin_reg &= ~DB_TMR_OUT_MASK;
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/*
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Debounce Debounce Timer Max
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TmrLarge TmrOutUnit Unit Debounce
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Time
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0 0 61 usec (2 RtcClk) 976 usec
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0 1 244 usec (8 RtcClk) 3.9 msec
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1 0 15.6 msec (512 RtcClk) 250 msec
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1 1 62.5 msec (2048 RtcClk) 1 sec
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*/
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if (debounce < 61) {
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pin_reg |= 1;
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pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
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pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
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} else if (debounce < 976) {
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time = debounce / 61;
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pin_reg |= time & DB_TMR_OUT_MASK;
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pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
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pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
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} else if (debounce < 3900) {
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time = debounce / 244;
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pin_reg |= time & DB_TMR_OUT_MASK;
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pin_reg |= BIT(DB_TMR_OUT_UNIT_OFF);
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pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
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} else if (debounce < 250000) {
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time = debounce / 15625;
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pin_reg |= time & DB_TMR_OUT_MASK;
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pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
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pin_reg |= BIT(DB_TMR_LARGE_OFF);
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} else if (debounce < 1000000) {
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time = debounce / 62500;
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pin_reg |= time & DB_TMR_OUT_MASK;
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pin_reg |= BIT(DB_TMR_OUT_UNIT_OFF);
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pin_reg |= BIT(DB_TMR_LARGE_OFF);
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} else {
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pin_reg &= ~(DB_CNTRl_MASK << DB_CNTRL_OFF);
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ret = -EINVAL;
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}
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} else {
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pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
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pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
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pin_reg &= ~DB_TMR_OUT_MASK;
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pin_reg &= ~(DB_CNTRl_MASK << DB_CNTRL_OFF);
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}
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writel(pin_reg, gpio_dev->base + offset * 4);
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raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
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return ret;
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}
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static int amd_gpio_set_config(struct gpio_chip *gc, unsigned offset,
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unsigned long config)
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{
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u32 debounce;
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if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
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return -ENOTSUPP;
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debounce = pinconf_to_config_argument(config);
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return amd_gpio_set_debounce(gc, offset, debounce);
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}
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#ifdef CONFIG_DEBUG_FS
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static void amd_gpio_dbg_show(struct seq_file *s, struct gpio_chip *gc)
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{
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u32 pin_reg;
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u32 db_cntrl;
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unsigned long flags;
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unsigned int bank, i, pin_num;
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struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
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bool tmr_out_unit;
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unsigned int time;
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unsigned int unit;
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bool tmr_large;
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char *level_trig;
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char *active_level;
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char *interrupt_enable;
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char *interrupt_mask;
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char *wake_cntrl0;
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char *wake_cntrl1;
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char *wake_cntrl2;
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char *pin_sts;
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char *pull_up_sel;
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char *pull_up_enable;
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char *pull_down_enable;
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char *output_value;
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char *output_enable;
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char debounce_value[40];
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char *debounce_enable;
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for (bank = 0; bank < gpio_dev->hwbank_num; bank++) {
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seq_printf(s, "GPIO bank%d\t", bank);
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switch (bank) {
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case 0:
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i = 0;
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pin_num = AMD_GPIO_PINS_BANK0;
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break;
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case 1:
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i = 64;
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pin_num = AMD_GPIO_PINS_BANK1 + i;
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break;
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case 2:
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i = 128;
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pin_num = AMD_GPIO_PINS_BANK2 + i;
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break;
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case 3:
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i = 192;
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pin_num = AMD_GPIO_PINS_BANK3 + i;
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break;
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default:
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/* Illegal bank number, ignore */
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continue;
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}
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for (; i < pin_num; i++) {
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seq_printf(s, "pin%d\t", i);
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raw_spin_lock_irqsave(&gpio_dev->lock, flags);
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pin_reg = readl(gpio_dev->base + i * 4);
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raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
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if (pin_reg & BIT(INTERRUPT_ENABLE_OFF)) {
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u8 level = (pin_reg >> ACTIVE_LEVEL_OFF) &
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ACTIVE_LEVEL_MASK;
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interrupt_enable = "interrupt is enabled|";
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if (level == ACTIVE_LEVEL_HIGH)
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active_level = "Active high|";
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else if (level == ACTIVE_LEVEL_LOW)
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active_level = "Active low|";
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else if (!(pin_reg & BIT(LEVEL_TRIG_OFF)) &&
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level == ACTIVE_LEVEL_BOTH)
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active_level = "Active on both|";
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else
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active_level = "Unknown Active level|";
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if (pin_reg & BIT(LEVEL_TRIG_OFF))
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level_trig = "Level trigger|";
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else
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level_trig = "Edge trigger|";
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} else {
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interrupt_enable =
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"interrupt is disabled|";
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active_level = " ";
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level_trig = " ";
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}
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if (pin_reg & BIT(INTERRUPT_MASK_OFF))
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interrupt_mask =
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"interrupt is unmasked|";
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else
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interrupt_mask =
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"interrupt is masked|";
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if (pin_reg & BIT(WAKE_CNTRL_OFF_S0I3))
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wake_cntrl0 = "enable wakeup in S0i3 state|";
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else
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wake_cntrl0 = "disable wakeup in S0i3 state|";
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if (pin_reg & BIT(WAKE_CNTRL_OFF_S3))
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wake_cntrl1 = "enable wakeup in S3 state|";
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else
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wake_cntrl1 = "disable wakeup in S3 state|";
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if (pin_reg & BIT(WAKE_CNTRL_OFF_S4))
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wake_cntrl2 = "enable wakeup in S4/S5 state|";
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else
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wake_cntrl2 = "disable wakeup in S4/S5 state|";
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if (pin_reg & BIT(PULL_UP_ENABLE_OFF)) {
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pull_up_enable = "pull-up is enabled|";
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if (pin_reg & BIT(PULL_UP_SEL_OFF))
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pull_up_sel = "8k pull-up|";
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else
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pull_up_sel = "4k pull-up|";
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} else {
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pull_up_enable = "pull-up is disabled|";
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pull_up_sel = " ";
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}
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if (pin_reg & BIT(PULL_DOWN_ENABLE_OFF))
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pull_down_enable = "pull-down is enabled|";
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else
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pull_down_enable = "Pull-down is disabled|";
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if (pin_reg & BIT(OUTPUT_ENABLE_OFF)) {
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pin_sts = " ";
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output_enable = "output is enabled|";
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if (pin_reg & BIT(OUTPUT_VALUE_OFF))
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output_value = "output is high|";
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else
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output_value = "output is low|";
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} else {
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output_enable = "output is disabled|";
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output_value = " ";
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if (pin_reg & BIT(PIN_STS_OFF))
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pin_sts = "input is high|";
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else
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pin_sts = "input is low|";
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}
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db_cntrl = (DB_CNTRl_MASK << DB_CNTRL_OFF) & pin_reg;
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if (db_cntrl) {
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tmr_out_unit = pin_reg & BIT(DB_TMR_OUT_UNIT_OFF);
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tmr_large = pin_reg & BIT(DB_TMR_LARGE_OFF);
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time = pin_reg & DB_TMR_OUT_MASK;
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if (tmr_large) {
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if (tmr_out_unit)
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unit = 62500;
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else
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unit = 15625;
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} else {
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if (tmr_out_unit)
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unit = 244;
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else
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unit = 61;
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}
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if ((DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF) == db_cntrl)
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debounce_enable = "debouncing filter (high and low) enabled|";
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else if ((DB_TYPE_PRESERVE_LOW_GLITCH << DB_CNTRL_OFF) == db_cntrl)
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debounce_enable = "debouncing filter (low) enabled|";
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else
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debounce_enable = "debouncing filter (high) enabled|";
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snprintf(debounce_value, sizeof(debounce_value),
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"debouncing timeout is %u (us)|", time * unit);
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} else {
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debounce_enable = "debouncing filter disabled|";
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snprintf(debounce_value, sizeof(debounce_value), " ");
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}
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seq_printf(s, "%s %s %s %s %s %s\n"
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" %s %s %s %s %s %s %s %s %s 0x%x\n",
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level_trig, active_level, interrupt_enable,
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interrupt_mask, wake_cntrl0, wake_cntrl1,
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wake_cntrl2, pin_sts, pull_up_sel,
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pull_up_enable, pull_down_enable,
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output_value, output_enable,
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debounce_enable, debounce_value, pin_reg);
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}
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}
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}
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#else
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#define amd_gpio_dbg_show NULL
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#endif
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static void amd_gpio_irq_enable(struct irq_data *d)
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{
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u32 pin_reg;
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unsigned long flags;
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
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gpiochip_enable_irq(gc, d->hwirq);
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raw_spin_lock_irqsave(&gpio_dev->lock, flags);
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pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
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pin_reg |= BIT(INTERRUPT_ENABLE_OFF);
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pin_reg |= BIT(INTERRUPT_MASK_OFF);
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writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
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raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
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}
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static void amd_gpio_irq_disable(struct irq_data *d)
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{
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u32 pin_reg;
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unsigned long flags;
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
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raw_spin_lock_irqsave(&gpio_dev->lock, flags);
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pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
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pin_reg &= ~BIT(INTERRUPT_ENABLE_OFF);
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pin_reg &= ~BIT(INTERRUPT_MASK_OFF);
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writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
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raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
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gpiochip_disable_irq(gc, d->hwirq);
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}
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static void amd_gpio_irq_mask(struct irq_data *d)
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{
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u32 pin_reg;
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unsigned long flags;
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
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raw_spin_lock_irqsave(&gpio_dev->lock, flags);
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pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
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pin_reg &= ~BIT(INTERRUPT_MASK_OFF);
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writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
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raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
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}
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static void amd_gpio_irq_unmask(struct irq_data *d)
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{
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u32 pin_reg;
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unsigned long flags;
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
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raw_spin_lock_irqsave(&gpio_dev->lock, flags);
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pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
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pin_reg |= BIT(INTERRUPT_MASK_OFF);
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writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
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raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
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}
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static int amd_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
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{
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u32 pin_reg;
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unsigned long flags;
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
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u32 wake_mask = BIT(WAKE_CNTRL_OFF_S0I3) | BIT(WAKE_CNTRL_OFF_S3);
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int err;
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raw_spin_lock_irqsave(&gpio_dev->lock, flags);
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pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
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if (on)
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pin_reg |= wake_mask;
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else
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pin_reg &= ~wake_mask;
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writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
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raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
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if (on)
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err = enable_irq_wake(gpio_dev->irq);
|
|
else
|
|
err = disable_irq_wake(gpio_dev->irq);
|
|
|
|
if (err)
|
|
dev_err(&gpio_dev->pdev->dev, "failed to %s wake-up interrupt\n",
|
|
on ? "enable" : "disable");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void amd_gpio_irq_eoi(struct irq_data *d)
|
|
{
|
|
u32 reg;
|
|
unsigned long flags;
|
|
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
|
|
struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
|
|
|
|
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
|
|
reg = readl(gpio_dev->base + WAKE_INT_MASTER_REG);
|
|
reg |= EOI_MASK;
|
|
writel(reg, gpio_dev->base + WAKE_INT_MASTER_REG);
|
|
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
|
|
}
|
|
|
|
static int amd_gpio_irq_set_type(struct irq_data *d, unsigned int type)
|
|
{
|
|
int ret = 0;
|
|
u32 pin_reg, pin_reg_irq_en, mask;
|
|
unsigned long flags;
|
|
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
|
|
struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
|
|
|
|
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
|
|
pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
|
|
|
|
switch (type & IRQ_TYPE_SENSE_MASK) {
|
|
case IRQ_TYPE_EDGE_RISING:
|
|
pin_reg &= ~BIT(LEVEL_TRIG_OFF);
|
|
pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
|
|
pin_reg |= ACTIVE_HIGH << ACTIVE_LEVEL_OFF;
|
|
irq_set_handler_locked(d, handle_edge_irq);
|
|
break;
|
|
|
|
case IRQ_TYPE_EDGE_FALLING:
|
|
pin_reg &= ~BIT(LEVEL_TRIG_OFF);
|
|
pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
|
|
pin_reg |= ACTIVE_LOW << ACTIVE_LEVEL_OFF;
|
|
irq_set_handler_locked(d, handle_edge_irq);
|
|
break;
|
|
|
|
case IRQ_TYPE_EDGE_BOTH:
|
|
pin_reg &= ~BIT(LEVEL_TRIG_OFF);
|
|
pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
|
|
pin_reg |= BOTH_EADGE << ACTIVE_LEVEL_OFF;
|
|
irq_set_handler_locked(d, handle_edge_irq);
|
|
break;
|
|
|
|
case IRQ_TYPE_LEVEL_HIGH:
|
|
pin_reg |= LEVEL_TRIGGER << LEVEL_TRIG_OFF;
|
|
pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
|
|
pin_reg |= ACTIVE_HIGH << ACTIVE_LEVEL_OFF;
|
|
irq_set_handler_locked(d, handle_level_irq);
|
|
break;
|
|
|
|
case IRQ_TYPE_LEVEL_LOW:
|
|
pin_reg |= LEVEL_TRIGGER << LEVEL_TRIG_OFF;
|
|
pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
|
|
pin_reg |= ACTIVE_LOW << ACTIVE_LEVEL_OFF;
|
|
irq_set_handler_locked(d, handle_level_irq);
|
|
break;
|
|
|
|
case IRQ_TYPE_NONE:
|
|
break;
|
|
|
|
default:
|
|
dev_err(&gpio_dev->pdev->dev, "Invalid type value\n");
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
pin_reg |= CLR_INTR_STAT << INTERRUPT_STS_OFF;
|
|
/*
|
|
* If WAKE_INT_MASTER_REG.MaskStsEn is set, a software write to the
|
|
* debounce registers of any GPIO will block wake/interrupt status
|
|
* generation for *all* GPIOs for a length of time that depends on
|
|
* WAKE_INT_MASTER_REG.MaskStsLength[11:0]. During this period the
|
|
* INTERRUPT_ENABLE bit will read as 0.
|
|
*
|
|
* We temporarily enable irq for the GPIO whose configuration is
|
|
* changing, and then wait for it to read back as 1 to know when
|
|
* debounce has settled and then disable the irq again.
|
|
* We do this polling with the spinlock held to ensure other GPIO
|
|
* access routines do not read an incorrect value for the irq enable
|
|
* bit of other GPIOs. We keep the GPIO masked while polling to avoid
|
|
* spurious irqs, and disable the irq again after polling.
|
|
*/
|
|
mask = BIT(INTERRUPT_ENABLE_OFF);
|
|
pin_reg_irq_en = pin_reg;
|
|
pin_reg_irq_en |= mask;
|
|
pin_reg_irq_en &= ~BIT(INTERRUPT_MASK_OFF);
|
|
writel(pin_reg_irq_en, gpio_dev->base + (d->hwirq)*4);
|
|
while ((readl(gpio_dev->base + (d->hwirq)*4) & mask) != mask)
|
|
continue;
|
|
writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
|
|
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void amd_irq_ack(struct irq_data *d)
|
|
{
|
|
/*
|
|
* based on HW design,there is no need to ack HW
|
|
* before handle current irq. But this routine is
|
|
* necessary for handle_edge_irq
|
|
*/
|
|
}
|
|
|
|
static const struct irq_chip amd_gpio_irqchip = {
|
|
.name = "amd_gpio",
|
|
.irq_ack = amd_irq_ack,
|
|
.irq_enable = amd_gpio_irq_enable,
|
|
.irq_disable = amd_gpio_irq_disable,
|
|
.irq_mask = amd_gpio_irq_mask,
|
|
.irq_unmask = amd_gpio_irq_unmask,
|
|
.irq_set_wake = amd_gpio_irq_set_wake,
|
|
.irq_eoi = amd_gpio_irq_eoi,
|
|
.irq_set_type = amd_gpio_irq_set_type,
|
|
/*
|
|
* We need to set IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND so that a wake event
|
|
* also generates an IRQ. We need the IRQ so the irq_handler can clear
|
|
* the wake event. Otherwise the wake event will never clear and
|
|
* prevent the system from suspending.
|
|
*/
|
|
.flags = IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND | IRQCHIP_IMMUTABLE,
|
|
GPIOCHIP_IRQ_RESOURCE_HELPERS,
|
|
};
|
|
|
|
#define PIN_IRQ_PENDING (BIT(INTERRUPT_STS_OFF) | BIT(WAKE_STS_OFF))
|
|
|
|
static bool do_amd_gpio_irq_handler(int irq, void *dev_id)
|
|
{
|
|
struct amd_gpio *gpio_dev = dev_id;
|
|
struct gpio_chip *gc = &gpio_dev->gc;
|
|
unsigned int i, irqnr;
|
|
unsigned long flags;
|
|
u32 __iomem *regs;
|
|
bool ret = false;
|
|
u32 regval;
|
|
u64 status, mask;
|
|
|
|
/* Read the wake status */
|
|
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
|
|
status = readl(gpio_dev->base + WAKE_INT_STATUS_REG1);
|
|
status <<= 32;
|
|
status |= readl(gpio_dev->base + WAKE_INT_STATUS_REG0);
|
|
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
|
|
|
|
/* Bit 0-45 contain the relevant status bits */
|
|
status &= (1ULL << 46) - 1;
|
|
regs = gpio_dev->base;
|
|
for (mask = 1, irqnr = 0; status; mask <<= 1, regs += 4, irqnr += 4) {
|
|
if (!(status & mask))
|
|
continue;
|
|
status &= ~mask;
|
|
|
|
/* Each status bit covers four pins */
|
|
for (i = 0; i < 4; i++) {
|
|
regval = readl(regs + i);
|
|
/* caused wake on resume context for shared IRQ */
|
|
if (irq < 0 && (regval & BIT(WAKE_STS_OFF))) {
|
|
dev_dbg(&gpio_dev->pdev->dev,
|
|
"Waking due to GPIO %d: 0x%x",
|
|
irqnr + i, regval);
|
|
return true;
|
|
}
|
|
|
|
if (!(regval & PIN_IRQ_PENDING) ||
|
|
!(regval & BIT(INTERRUPT_MASK_OFF)))
|
|
continue;
|
|
generic_handle_domain_irq(gc->irq.domain, irqnr + i);
|
|
|
|
/* Clear interrupt.
|
|
* We must read the pin register again, in case the
|
|
* value was changed while executing
|
|
* generic_handle_domain_irq() above.
|
|
* If we didn't find a mapping for the interrupt,
|
|
* disable it in order to avoid a system hang caused
|
|
* by an interrupt storm.
|
|
*/
|
|
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
|
|
regval = readl(regs + i);
|
|
if (irq == 0) {
|
|
regval &= ~BIT(INTERRUPT_ENABLE_OFF);
|
|
dev_dbg(&gpio_dev->pdev->dev,
|
|
"Disabling spurious GPIO IRQ %d\n",
|
|
irqnr + i);
|
|
}
|
|
writel(regval, regs + i);
|
|
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
|
|
ret = true;
|
|
}
|
|
}
|
|
/* did not cause wake on resume context for shared IRQ */
|
|
if (irq < 0)
|
|
return false;
|
|
|
|
/* Signal EOI to the GPIO unit */
|
|
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
|
|
regval = readl(gpio_dev->base + WAKE_INT_MASTER_REG);
|
|
regval |= EOI_MASK;
|
|
writel(regval, gpio_dev->base + WAKE_INT_MASTER_REG);
|
|
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static irqreturn_t amd_gpio_irq_handler(int irq, void *dev_id)
|
|
{
|
|
return IRQ_RETVAL(do_amd_gpio_irq_handler(irq, dev_id));
|
|
}
|
|
|
|
static bool __maybe_unused amd_gpio_check_wake(void *dev_id)
|
|
{
|
|
return do_amd_gpio_irq_handler(-1, dev_id);
|
|
}
|
|
|
|
static int amd_get_groups_count(struct pinctrl_dev *pctldev)
|
|
{
|
|
struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
|
|
|
|
return gpio_dev->ngroups;
|
|
}
|
|
|
|
static const char *amd_get_group_name(struct pinctrl_dev *pctldev,
|
|
unsigned group)
|
|
{
|
|
struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
|
|
|
|
return gpio_dev->groups[group].name;
|
|
}
|
|
|
|
static int amd_get_group_pins(struct pinctrl_dev *pctldev,
|
|
unsigned group,
|
|
const unsigned **pins,
|
|
unsigned *num_pins)
|
|
{
|
|
struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
|
|
|
|
*pins = gpio_dev->groups[group].pins;
|
|
*num_pins = gpio_dev->groups[group].npins;
|
|
return 0;
|
|
}
|
|
|
|
static const struct pinctrl_ops amd_pinctrl_ops = {
|
|
.get_groups_count = amd_get_groups_count,
|
|
.get_group_name = amd_get_group_name,
|
|
.get_group_pins = amd_get_group_pins,
|
|
#ifdef CONFIG_OF
|
|
.dt_node_to_map = pinconf_generic_dt_node_to_map_group,
|
|
.dt_free_map = pinctrl_utils_free_map,
|
|
#endif
|
|
};
|
|
|
|
static int amd_pinconf_get(struct pinctrl_dev *pctldev,
|
|
unsigned int pin,
|
|
unsigned long *config)
|
|
{
|
|
u32 pin_reg;
|
|
unsigned arg;
|
|
unsigned long flags;
|
|
struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
|
|
enum pin_config_param param = pinconf_to_config_param(*config);
|
|
|
|
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
|
|
pin_reg = readl(gpio_dev->base + pin*4);
|
|
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
|
|
switch (param) {
|
|
case PIN_CONFIG_INPUT_DEBOUNCE:
|
|
arg = pin_reg & DB_TMR_OUT_MASK;
|
|
break;
|
|
|
|
case PIN_CONFIG_BIAS_PULL_DOWN:
|
|
arg = (pin_reg >> PULL_DOWN_ENABLE_OFF) & BIT(0);
|
|
break;
|
|
|
|
case PIN_CONFIG_BIAS_PULL_UP:
|
|
arg = (pin_reg >> PULL_UP_SEL_OFF) & (BIT(0) | BIT(1));
|
|
break;
|
|
|
|
case PIN_CONFIG_DRIVE_STRENGTH:
|
|
arg = (pin_reg >> DRV_STRENGTH_SEL_OFF) & DRV_STRENGTH_SEL_MASK;
|
|
break;
|
|
|
|
default:
|
|
dev_err(&gpio_dev->pdev->dev, "Invalid config param %04x\n",
|
|
param);
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
*config = pinconf_to_config_packed(param, arg);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int amd_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
|
|
unsigned long *configs, unsigned num_configs)
|
|
{
|
|
int i;
|
|
u32 arg;
|
|
int ret = 0;
|
|
u32 pin_reg;
|
|
unsigned long flags;
|
|
enum pin_config_param param;
|
|
struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
|
|
|
|
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
|
|
for (i = 0; i < num_configs; i++) {
|
|
param = pinconf_to_config_param(configs[i]);
|
|
arg = pinconf_to_config_argument(configs[i]);
|
|
pin_reg = readl(gpio_dev->base + pin*4);
|
|
|
|
switch (param) {
|
|
case PIN_CONFIG_INPUT_DEBOUNCE:
|
|
pin_reg &= ~DB_TMR_OUT_MASK;
|
|
pin_reg |= arg & DB_TMR_OUT_MASK;
|
|
break;
|
|
|
|
case PIN_CONFIG_BIAS_PULL_DOWN:
|
|
pin_reg &= ~BIT(PULL_DOWN_ENABLE_OFF);
|
|
pin_reg |= (arg & BIT(0)) << PULL_DOWN_ENABLE_OFF;
|
|
break;
|
|
|
|
case PIN_CONFIG_BIAS_PULL_UP:
|
|
pin_reg &= ~BIT(PULL_UP_SEL_OFF);
|
|
pin_reg |= (arg & BIT(0)) << PULL_UP_SEL_OFF;
|
|
pin_reg &= ~BIT(PULL_UP_ENABLE_OFF);
|
|
pin_reg |= ((arg>>1) & BIT(0)) << PULL_UP_ENABLE_OFF;
|
|
break;
|
|
|
|
case PIN_CONFIG_DRIVE_STRENGTH:
|
|
pin_reg &= ~(DRV_STRENGTH_SEL_MASK
|
|
<< DRV_STRENGTH_SEL_OFF);
|
|
pin_reg |= (arg & DRV_STRENGTH_SEL_MASK)
|
|
<< DRV_STRENGTH_SEL_OFF;
|
|
break;
|
|
|
|
default:
|
|
dev_err(&gpio_dev->pdev->dev,
|
|
"Invalid config param %04x\n", param);
|
|
ret = -ENOTSUPP;
|
|
}
|
|
|
|
writel(pin_reg, gpio_dev->base + pin*4);
|
|
}
|
|
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int amd_pinconf_group_get(struct pinctrl_dev *pctldev,
|
|
unsigned int group,
|
|
unsigned long *config)
|
|
{
|
|
const unsigned *pins;
|
|
unsigned npins;
|
|
int ret;
|
|
|
|
ret = amd_get_group_pins(pctldev, group, &pins, &npins);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (amd_pinconf_get(pctldev, pins[0], config))
|
|
return -ENOTSUPP;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int amd_pinconf_group_set(struct pinctrl_dev *pctldev,
|
|
unsigned group, unsigned long *configs,
|
|
unsigned num_configs)
|
|
{
|
|
const unsigned *pins;
|
|
unsigned npins;
|
|
int i, ret;
|
|
|
|
ret = amd_get_group_pins(pctldev, group, &pins, &npins);
|
|
if (ret)
|
|
return ret;
|
|
for (i = 0; i < npins; i++) {
|
|
if (amd_pinconf_set(pctldev, pins[i], configs, num_configs))
|
|
return -ENOTSUPP;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct pinconf_ops amd_pinconf_ops = {
|
|
.pin_config_get = amd_pinconf_get,
|
|
.pin_config_set = amd_pinconf_set,
|
|
.pin_config_group_get = amd_pinconf_group_get,
|
|
.pin_config_group_set = amd_pinconf_group_set,
|
|
};
|
|
|
|
static void amd_gpio_irq_init(struct amd_gpio *gpio_dev)
|
|
{
|
|
struct pinctrl_desc *desc = gpio_dev->pctrl->desc;
|
|
unsigned long flags;
|
|
u32 pin_reg, mask;
|
|
int i;
|
|
|
|
mask = BIT(WAKE_CNTRL_OFF_S0I3) | BIT(WAKE_CNTRL_OFF_S3) |
|
|
BIT(INTERRUPT_MASK_OFF) | BIT(INTERRUPT_ENABLE_OFF) |
|
|
BIT(WAKE_CNTRL_OFF_S4);
|
|
|
|
for (i = 0; i < desc->npins; i++) {
|
|
int pin = desc->pins[i].number;
|
|
const struct pin_desc *pd = pin_desc_get(gpio_dev->pctrl, pin);
|
|
|
|
if (!pd)
|
|
continue;
|
|
|
|
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
|
|
|
|
pin_reg = readl(gpio_dev->base + i * 4);
|
|
pin_reg &= ~mask;
|
|
writel(pin_reg, gpio_dev->base + i * 4);
|
|
|
|
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static bool amd_gpio_should_save(struct amd_gpio *gpio_dev, unsigned int pin)
|
|
{
|
|
const struct pin_desc *pd = pin_desc_get(gpio_dev->pctrl, pin);
|
|
|
|
if (!pd)
|
|
return false;
|
|
|
|
/*
|
|
* Only restore the pin if it is actually in use by the kernel (or
|
|
* by userspace).
|
|
*/
|
|
if (pd->mux_owner || pd->gpio_owner ||
|
|
gpiochip_line_is_irq(&gpio_dev->gc, pin))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static int amd_gpio_suspend(struct device *dev)
|
|
{
|
|
struct amd_gpio *gpio_dev = dev_get_drvdata(dev);
|
|
struct pinctrl_desc *desc = gpio_dev->pctrl->desc;
|
|
int i;
|
|
|
|
for (i = 0; i < desc->npins; i++) {
|
|
int pin = desc->pins[i].number;
|
|
|
|
if (!amd_gpio_should_save(gpio_dev, pin))
|
|
continue;
|
|
|
|
gpio_dev->saved_regs[i] = readl(gpio_dev->base + pin*4);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int amd_gpio_resume(struct device *dev)
|
|
{
|
|
struct amd_gpio *gpio_dev = dev_get_drvdata(dev);
|
|
struct pinctrl_desc *desc = gpio_dev->pctrl->desc;
|
|
int i;
|
|
|
|
for (i = 0; i < desc->npins; i++) {
|
|
int pin = desc->pins[i].number;
|
|
|
|
if (!amd_gpio_should_save(gpio_dev, pin))
|
|
continue;
|
|
|
|
writel(gpio_dev->saved_regs[i], gpio_dev->base + pin*4);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct dev_pm_ops amd_gpio_pm_ops = {
|
|
SET_LATE_SYSTEM_SLEEP_PM_OPS(amd_gpio_suspend,
|
|
amd_gpio_resume)
|
|
};
|
|
#endif
|
|
|
|
static struct pinctrl_desc amd_pinctrl_desc = {
|
|
.pins = kerncz_pins,
|
|
.npins = ARRAY_SIZE(kerncz_pins),
|
|
.pctlops = &amd_pinctrl_ops,
|
|
.confops = &amd_pinconf_ops,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int amd_gpio_probe(struct platform_device *pdev)
|
|
{
|
|
int ret = 0;
|
|
struct resource *res;
|
|
struct amd_gpio *gpio_dev;
|
|
struct gpio_irq_chip *girq;
|
|
|
|
gpio_dev = devm_kzalloc(&pdev->dev,
|
|
sizeof(struct amd_gpio), GFP_KERNEL);
|
|
if (!gpio_dev)
|
|
return -ENOMEM;
|
|
|
|
raw_spin_lock_init(&gpio_dev->lock);
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!res) {
|
|
dev_err(&pdev->dev, "Failed to get gpio io resource.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
gpio_dev->base = devm_ioremap(&pdev->dev, res->start,
|
|
resource_size(res));
|
|
if (!gpio_dev->base)
|
|
return -ENOMEM;
|
|
|
|
gpio_dev->irq = platform_get_irq(pdev, 0);
|
|
if (gpio_dev->irq < 0)
|
|
return gpio_dev->irq;
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
gpio_dev->saved_regs = devm_kcalloc(&pdev->dev, amd_pinctrl_desc.npins,
|
|
sizeof(*gpio_dev->saved_regs),
|
|
GFP_KERNEL);
|
|
if (!gpio_dev->saved_regs)
|
|
return -ENOMEM;
|
|
#endif
|
|
|
|
gpio_dev->pdev = pdev;
|
|
gpio_dev->gc.get_direction = amd_gpio_get_direction;
|
|
gpio_dev->gc.direction_input = amd_gpio_direction_input;
|
|
gpio_dev->gc.direction_output = amd_gpio_direction_output;
|
|
gpio_dev->gc.get = amd_gpio_get_value;
|
|
gpio_dev->gc.set = amd_gpio_set_value;
|
|
gpio_dev->gc.set_config = amd_gpio_set_config;
|
|
gpio_dev->gc.dbg_show = amd_gpio_dbg_show;
|
|
|
|
gpio_dev->gc.base = -1;
|
|
gpio_dev->gc.label = pdev->name;
|
|
gpio_dev->gc.owner = THIS_MODULE;
|
|
gpio_dev->gc.parent = &pdev->dev;
|
|
gpio_dev->gc.ngpio = resource_size(res) / 4;
|
|
|
|
gpio_dev->hwbank_num = gpio_dev->gc.ngpio / 64;
|
|
gpio_dev->groups = kerncz_groups;
|
|
gpio_dev->ngroups = ARRAY_SIZE(kerncz_groups);
|
|
|
|
amd_pinctrl_desc.name = dev_name(&pdev->dev);
|
|
gpio_dev->pctrl = devm_pinctrl_register(&pdev->dev, &amd_pinctrl_desc,
|
|
gpio_dev);
|
|
if (IS_ERR(gpio_dev->pctrl)) {
|
|
dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
|
|
return PTR_ERR(gpio_dev->pctrl);
|
|
}
|
|
|
|
/* Disable and mask interrupts */
|
|
amd_gpio_irq_init(gpio_dev);
|
|
|
|
girq = &gpio_dev->gc.irq;
|
|
gpio_irq_chip_set_chip(girq, &amd_gpio_irqchip);
|
|
/* This will let us handle the parent IRQ in the driver */
|
|
girq->parent_handler = NULL;
|
|
girq->num_parents = 0;
|
|
girq->parents = NULL;
|
|
girq->default_type = IRQ_TYPE_NONE;
|
|
girq->handler = handle_simple_irq;
|
|
|
|
ret = gpiochip_add_data(&gpio_dev->gc, gpio_dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = gpiochip_add_pin_range(&gpio_dev->gc, dev_name(&pdev->dev),
|
|
0, 0, gpio_dev->gc.ngpio);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Failed to add pin range\n");
|
|
goto out2;
|
|
}
|
|
|
|
ret = devm_request_irq(&pdev->dev, gpio_dev->irq, amd_gpio_irq_handler,
|
|
IRQF_SHARED, KBUILD_MODNAME, gpio_dev);
|
|
if (ret)
|
|
goto out2;
|
|
|
|
platform_set_drvdata(pdev, gpio_dev);
|
|
acpi_register_wakeup_handler(gpio_dev->irq, amd_gpio_check_wake, gpio_dev);
|
|
|
|
dev_dbg(&pdev->dev, "amd gpio driver loaded\n");
|
|
return ret;
|
|
|
|
out2:
|
|
gpiochip_remove(&gpio_dev->gc);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int amd_gpio_remove(struct platform_device *pdev)
|
|
{
|
|
struct amd_gpio *gpio_dev;
|
|
|
|
gpio_dev = platform_get_drvdata(pdev);
|
|
|
|
gpiochip_remove(&gpio_dev->gc);
|
|
acpi_unregister_wakeup_handler(amd_gpio_check_wake, gpio_dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_ACPI
|
|
static const struct acpi_device_id amd_gpio_acpi_match[] = {
|
|
{ "AMD0030", 0 },
|
|
{ "AMDI0030", 0},
|
|
{ "AMDI0031", 0},
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(acpi, amd_gpio_acpi_match);
|
|
#endif
|
|
|
|
static struct platform_driver amd_gpio_driver = {
|
|
.driver = {
|
|
.name = "amd_gpio",
|
|
.acpi_match_table = ACPI_PTR(amd_gpio_acpi_match),
|
|
#ifdef CONFIG_PM_SLEEP
|
|
.pm = &amd_gpio_pm_ops,
|
|
#endif
|
|
},
|
|
.probe = amd_gpio_probe,
|
|
.remove = amd_gpio_remove,
|
|
};
|
|
|
|
module_platform_driver(amd_gpio_driver);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_AUTHOR("Ken Xue <Ken.Xue@amd.com>, Jeff Wu <Jeff.Wu@amd.com>");
|
|
MODULE_DESCRIPTION("AMD GPIO pinctrl driver");
|