--- /dev/null
+/*
+ * GPIO driver for AMD
+ *
+ * Copyright (c) 2014,2015 AMD Corporation.
+ * Authors: Ken Xue <Ken.Xue@amd.com>
+ * Wu, Jeff <Jeff.Wu@amd.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.
+ */
+
+#include <linux/err.h>
+#include <linux/bug.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/compiler.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/log2.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <linux/acpi.h>
+#include <linux/seq_file.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/bitops.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+
+#include "pinctrl-utils.h"
+#include "pinctrl-amd.h"
+
+static inline struct amd_gpio *to_amd_gpio(struct gpio_chip *gc)
+{
+ return container_of(gc, struct amd_gpio, gc);
+}
+
+static int amd_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
+{
+ unsigned long flags;
+ u32 pin_reg;
+ struct amd_gpio *gpio_dev = to_amd_gpio(gc);
+
+ spin_lock_irqsave(&gpio_dev->lock, flags);
+ pin_reg = readl(gpio_dev->base + offset * 4);
+ /*
+ * Suppose BIOS or Bootloader sets specific debounce for the
+ * GPIO. if not, set debounce to be 2.75ms and remove glitch.
+ */
+ if ((pin_reg & DB_TMR_OUT_MASK) == 0) {
+ pin_reg |= 0xf;
+ pin_reg |= BIT(DB_TMR_OUT_UNIT_OFF);
+ pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF;
+ pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
+ }
+
+ pin_reg &= ~BIT(OUTPUT_ENABLE_OFF);
+ writel(pin_reg, gpio_dev->base + offset * 4);
+ spin_unlock_irqrestore(&gpio_dev->lock, flags);
+
+ return 0;
+}
+
+static int amd_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
+ int value)
+{
+ u32 pin_reg;
+ unsigned long flags;
+ struct amd_gpio *gpio_dev = to_amd_gpio(gc);
+
+ spin_lock_irqsave(&gpio_dev->lock, flags);
+ pin_reg = readl(gpio_dev->base + offset * 4);
+ pin_reg |= BIT(OUTPUT_ENABLE_OFF);
+ if (value)
+ pin_reg |= BIT(OUTPUT_VALUE_OFF);
+ else
+ pin_reg &= ~BIT(OUTPUT_VALUE_OFF);
+ writel(pin_reg, gpio_dev->base + offset * 4);
+ spin_unlock_irqrestore(&gpio_dev->lock, flags);
+
+ return 0;
+}
+
+static int amd_gpio_get_value(struct gpio_chip *gc, unsigned offset)
+{
+ u32 pin_reg;
+ unsigned long flags;
+ struct amd_gpio *gpio_dev = to_amd_gpio(gc);
+
+ spin_lock_irqsave(&gpio_dev->lock, flags);
+ pin_reg = readl(gpio_dev->base + offset * 4);
+ spin_unlock_irqrestore(&gpio_dev->lock, flags);
+
+ return !!(pin_reg & BIT(PIN_STS_OFF));
+}
+
+static void amd_gpio_set_value(struct gpio_chip *gc, unsigned offset, int value)
+{
+ u32 pin_reg;
+ unsigned long flags;
+ struct amd_gpio *gpio_dev = to_amd_gpio(gc);
+
+ spin_lock_irqsave(&gpio_dev->lock, flags);
+ pin_reg = readl(gpio_dev->base + offset * 4);
+ if (value)
+ pin_reg |= BIT(OUTPUT_VALUE_OFF);
+ else
+ pin_reg &= ~BIT(OUTPUT_VALUE_OFF);
+ writel(pin_reg, gpio_dev->base + offset * 4);
+ spin_unlock_irqrestore(&gpio_dev->lock, flags);
+}
+
+static int amd_gpio_set_debounce(struct gpio_chip *gc, unsigned offset,
+ unsigned debounce)
+{
+ u32 time;
+ u32 pin_reg;
+ int ret = 0;
+ unsigned long flags;
+ struct amd_gpio *gpio_dev = to_amd_gpio(gc);
+
+ spin_lock_irqsave(&gpio_dev->lock, flags);
+ pin_reg = readl(gpio_dev->base + offset * 4);
+
+ if (debounce) {
+ pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF;
+ pin_reg &= ~DB_TMR_OUT_MASK;
+ /*
+ Debounce Debounce Timer Max
+ TmrLarge TmrOutUnit Unit Debounce
+ Time
+ 0 0 61 usec (2 RtcClk) 976 usec
+ 0 1 244 usec (8 RtcClk) 3.9 msec
+ 1 0 15.6 msec (512 RtcClk) 250 msec
+ 1 1 62.5 msec (2048 RtcClk) 1 sec
+ */
+
+ if (debounce < 61) {
+ pin_reg |= 1;
+ pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
+ pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
+ } else if (debounce < 976) {
+ time = debounce / 61;
+ pin_reg |= time & DB_TMR_OUT_MASK;
+ pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
+ pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
+ } else if (debounce < 3900) {
+ time = debounce / 244;
+ pin_reg |= time & DB_TMR_OUT_MASK;
+ pin_reg |= BIT(DB_TMR_OUT_UNIT_OFF);
+ pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
+ } else if (debounce < 250000) {
+ time = debounce / 15600;
+ pin_reg |= time & DB_TMR_OUT_MASK;
+ pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
+ pin_reg |= BIT(DB_TMR_LARGE_OFF);
+ } else if (debounce < 1000000) {
+ time = debounce / 62500;
+ pin_reg |= time & DB_TMR_OUT_MASK;
+ pin_reg |= BIT(DB_TMR_OUT_UNIT_OFF);
+ pin_reg |= BIT(DB_TMR_LARGE_OFF);
+ } else {
+ pin_reg &= ~DB_CNTRl_MASK;
+ ret = -EINVAL;
+ }
+ } else {
+ pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
+ pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
+ pin_reg &= ~DB_TMR_OUT_MASK;
+ pin_reg &= ~DB_CNTRl_MASK;
+ }
+ writel(pin_reg, gpio_dev->base + offset * 4);
+ spin_unlock_irqrestore(&gpio_dev->lock, flags);
+
+ return ret;
+}
+
+#ifdef CONFIG_DEBUG_FS
+static void amd_gpio_dbg_show(struct seq_file *s, struct gpio_chip *gc)
+{
+ u32 pin_reg;
+ unsigned long flags;
+ unsigned int bank, i, pin_num;
+ struct amd_gpio *gpio_dev = to_amd_gpio(gc);
+
+ char *level_trig;
+ char *active_level;
+ char *interrupt_enable;
+ char *interrupt_mask;
+ char *wake_cntrl0;
+ char *wake_cntrl1;
+ char *wake_cntrl2;
+ char *pin_sts;
+ char *pull_up_sel;
+ char *pull_up_enable;
+ char *pull_down_enable;
+ char *output_value;
+ char *output_enable;
+
+ for (bank = 0; bank < AMD_GPIO_TOTAL_BANKS; bank++) {
+ seq_printf(s, "GPIO bank%d\t", bank);
+
+ switch (bank) {
+ case 0:
+ i = 0;
+ pin_num = AMD_GPIO_PINS_BANK0;
+ break;
+ case 1:
+ i = 64;
+ pin_num = AMD_GPIO_PINS_BANK1 + i;
+ break;
+ case 2:
+ i = 128;
+ pin_num = AMD_GPIO_PINS_BANK2 + i;
+ break;
+ }
+
+ for (; i < pin_num; i++) {
+ seq_printf(s, "pin%d\t", i);
+ spin_lock_irqsave(&gpio_dev->lock, flags);
+ pin_reg = readl(gpio_dev->base + i * 4);
+ spin_unlock_irqrestore(&gpio_dev->lock, flags);
+
+ if (pin_reg & BIT(INTERRUPT_ENABLE_OFF)) {
+ interrupt_enable = "interrupt is enabled|";
+
+ if (!(pin_reg & BIT(ACTIVE_LEVEL_OFF))
+ && !(pin_reg & BIT(ACTIVE_LEVEL_OFF+1)))
+ active_level = "Active low|";
+ else if (pin_reg & BIT(ACTIVE_LEVEL_OFF)
+ && !(pin_reg & BIT(ACTIVE_LEVEL_OFF+1)))
+ active_level = "Active high|";
+ else if (!(pin_reg & BIT(ACTIVE_LEVEL_OFF))
+ && pin_reg & BIT(ACTIVE_LEVEL_OFF+1))
+ active_level = "Active on both|";
+ else
+ active_level = "Unknow Active level|";
+
+ if (pin_reg & BIT(LEVEL_TRIG_OFF))
+ level_trig = "Level trigger|";
+ else
+ level_trig = "Edge trigger|";
+
+ } else {
+ interrupt_enable =
+ "interrupt is disabled|";
+ active_level = " ";
+ level_trig = " ";
+ }
+
+ if (pin_reg & BIT(INTERRUPT_MASK_OFF))
+ interrupt_mask =
+ "interrupt is unmasked|";
+ else
+ interrupt_mask =
+ "interrupt is masked|";
+
+ if (pin_reg & BIT(WAKE_CNTRL_OFF))
+ wake_cntrl0 = "enable wakeup in S0i3 state|";
+ else
+ wake_cntrl0 = "disable wakeup in S0i3 state|";
+
+ if (pin_reg & BIT(WAKE_CNTRL_OFF))
+ wake_cntrl1 = "enable wakeup in S3 state|";
+ else
+ wake_cntrl1 = "disable wakeup in S3 state|";
+
+ if (pin_reg & BIT(WAKE_CNTRL_OFF))
+ wake_cntrl2 = "enable wakeup in S4/S5 state|";
+ else
+ wake_cntrl2 = "disable wakeup in S4/S5 state|";
+
+ if (pin_reg & BIT(PULL_UP_ENABLE_OFF)) {
+ pull_up_enable = "pull-up is enabled|";
+ if (pin_reg & BIT(PULL_UP_SEL_OFF))
+ pull_up_sel = "8k pull-up|";
+ else
+ pull_up_sel = "4k pull-up|";
+ } else {
+ pull_up_enable = "pull-up is disabled|";
+ pull_up_sel = " ";
+ }
+
+ if (pin_reg & BIT(PULL_DOWN_ENABLE_OFF))
+ pull_down_enable = "pull-down is enabled|";
+ else
+ pull_down_enable = "Pull-down is disabled|";
+
+ if (pin_reg & BIT(OUTPUT_ENABLE_OFF)) {
+ pin_sts = " ";
+ output_enable = "output is enabled|";
+ if (pin_reg & BIT(OUTPUT_VALUE_OFF))
+ output_value = "output is high|";
+ else
+ output_value = "output is low|";
+ } else {
+ output_enable = "output is disabled|";
+ output_value = " ";
+
+ if (pin_reg & BIT(PIN_STS_OFF))
+ pin_sts = "input is high|";
+ else
+ pin_sts = "input is low|";
+ }
+
+ seq_printf(s, "%s %s %s %s %s %s\n"
+ " %s %s %s %s %s %s %s 0x%x\n",
+ level_trig, active_level, interrupt_enable,
+ interrupt_mask, wake_cntrl0, wake_cntrl1,
+ wake_cntrl2, pin_sts, pull_up_sel,
+ pull_up_enable, pull_down_enable,
+ output_value, output_enable, pin_reg);
+ }
+ }
+}
+#else
+#define amd_gpio_dbg_show NULL
+#endif
+
+static void amd_gpio_irq_enable(struct irq_data *d)
+{
+ u32 pin_reg;
+ unsigned long flags;
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct amd_gpio *gpio_dev = to_amd_gpio(gc);
+
+ spin_lock_irqsave(&gpio_dev->lock, flags);
+ pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
+ /*
+ Suppose BIOS or Bootloader sets specific debounce for the
+ GPIO. if not, set debounce to be 2.75ms.
+ */
+ if ((pin_reg & DB_TMR_OUT_MASK) == 0) {
+ pin_reg |= 0xf;
+ pin_reg |= BIT(DB_TMR_OUT_UNIT_OFF);
+ pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
+ }
+ pin_reg |= BIT(INTERRUPT_ENABLE_OFF);
+ pin_reg |= BIT(INTERRUPT_MASK_OFF);
+ writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
+ spin_unlock_irqrestore(&gpio_dev->lock, flags);
+}
+
+static void amd_gpio_irq_disable(struct irq_data *d)
+{
+ u32 pin_reg;
+ unsigned long flags;
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct amd_gpio *gpio_dev = to_amd_gpio(gc);
+
+ spin_lock_irqsave(&gpio_dev->lock, flags);
+ pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
+ pin_reg &= ~BIT(INTERRUPT_ENABLE_OFF);
+ pin_reg &= ~BIT(INTERRUPT_MASK_OFF);
+ writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
+ spin_unlock_irqrestore(&gpio_dev->lock, flags);
+}
+
+static void amd_gpio_irq_mask(struct irq_data *d)
+{
+ u32 pin_reg;
+ unsigned long flags;
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct amd_gpio *gpio_dev = to_amd_gpio(gc);
+
+ spin_lock_irqsave(&gpio_dev->lock, flags);
+ pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
+ pin_reg &= ~BIT(INTERRUPT_MASK_OFF);
+ writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
+ spin_unlock_irqrestore(&gpio_dev->lock, flags);
+}
+
+static void amd_gpio_irq_unmask(struct irq_data *d)
+{
+ u32 pin_reg;
+ unsigned long flags;
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct amd_gpio *gpio_dev = to_amd_gpio(gc);
+
+ spin_lock_irqsave(&gpio_dev->lock, flags);
+ pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
+ pin_reg |= BIT(INTERRUPT_MASK_OFF);
+ writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
+ spin_unlock_irqrestore(&gpio_dev->lock, flags);
+}
+
+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 = to_amd_gpio(gc);
+
+ 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);
+ 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;
+ unsigned long flags;
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct amd_gpio *gpio_dev = to_amd_gpio(gc);
+
+ 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;
+ pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF;
+ __irq_set_handler_locked(d->irq, 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;
+ pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF;
+ __irq_set_handler_locked(d->irq, 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;
+ pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF;
+ __irq_set_handler_locked(d->irq, 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;
+ pin_reg &= ~(DB_CNTRl_MASK << DB_CNTRL_OFF);
+ pin_reg |= DB_TYPE_PRESERVE_LOW_GLITCH << DB_CNTRL_OFF;
+ __irq_set_handler_locked(d->irq, 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;
+ pin_reg &= ~(DB_CNTRl_MASK << DB_CNTRL_OFF);
+ pin_reg |= DB_TYPE_PRESERVE_HIGH_GLITCH << DB_CNTRL_OFF;
+ __irq_set_handler_locked(d->irq, 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;
+ writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
+ 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 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_eoi = amd_gpio_irq_eoi,
+ .irq_set_type = amd_gpio_irq_set_type,
+};
+
+static void amd_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+ u32 i;
+ u32 off;
+ u32 reg;
+ u32 pin_reg;
+ u64 reg64;
+ int handled = 0;
+ unsigned long flags;
+ struct irq_chip *chip = irq_get_chip(irq);
+ struct gpio_chip *gc = irq_desc_get_handler_data(desc);
+ struct amd_gpio *gpio_dev = to_amd_gpio(gc);
+
+ chained_irq_enter(chip, desc);
+ /*enable GPIO interrupt again*/
+ spin_lock_irqsave(&gpio_dev->lock, flags);
+ reg = readl(gpio_dev->base + WAKE_INT_STATUS_REG1);
+ reg64 = reg;
+ reg64 = reg64 << 32;
+
+ reg = readl(gpio_dev->base + WAKE_INT_STATUS_REG0);
+ reg64 |= reg;
+ spin_unlock_irqrestore(&gpio_dev->lock, flags);
+
+ /*
+ * first 46 bits indicates interrupt status.
+ * one bit represents four interrupt sources.
+ */
+ for (off = 0; off < 46 ; off++) {
+ if (reg64 & BIT(off)) {
+ for (i = 0; i < 4; i++) {
+ pin_reg = readl(gpio_dev->base +
+ (off * 4 + i) * 4);
+ if ((pin_reg & BIT(INTERRUPT_STS_OFF)) ||
+ (pin_reg & BIT(WAKE_STS_OFF))) {
+ irq = irq_find_mapping(gc->irqdomain,
+ off * 4 + i);
+ generic_handle_irq(irq);
+ writel(pin_reg,
+ gpio_dev->base
+ + (off * 4 + i) * 4);
+ handled++;
+ }
+ }
+ }
+ }
+
+ if (handled == 0)
+ handle_bad_irq(irq, desc);
+
+ 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);
+ spin_unlock_irqrestore(&gpio_dev->lock, flags);
+
+ chained_irq_exit(chip, desc);
+}
+
+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_dt_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);
+
+ spin_lock_irqsave(&gpio_dev->lock, flags);
+ pin_reg = readl(gpio_dev->base + pin*4);
+ 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);
+
+ 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);
+ }
+ 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 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;
+ int irq_base;
+ struct resource *res;
+ struct amd_gpio *gpio_dev;
+
+ gpio_dev = devm_kzalloc(&pdev->dev,
+ sizeof(struct amd_gpio), GFP_KERNEL);
+ if (!gpio_dev)
+ return -ENOMEM;
+
+ 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_nocache(&pdev->dev, res->start,
+ resource_size(res));
+ if (IS_ERR(gpio_dev->base))
+ return PTR_ERR(gpio_dev->base);
+
+ irq_base = platform_get_irq(pdev, 0);
+ if (irq_base < 0) {
+ dev_err(&pdev->dev, "Failed to get gpio IRQ.\n");
+ return -EINVAL;
+ }
+
+ gpio_dev->pdev = pdev;
+ 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_debounce = amd_gpio_set_debounce;
+ gpio_dev->gc.dbg_show = amd_gpio_dbg_show;
+
+ gpio_dev->gc.base = 0;
+ gpio_dev->gc.label = pdev->name;
+ gpio_dev->gc.owner = THIS_MODULE;
+ gpio_dev->gc.dev = &pdev->dev;
+ gpio_dev->gc.ngpio = TOTAL_NUMBER_OF_PINS;
+#if defined(CONFIG_OF_GPIO)
+ gpio_dev->gc.of_node = pdev->dev.of_node;
+#endif
+
+ gpio_dev->groups = kerncz_groups;
+ gpio_dev->ngroups = ARRAY_SIZE(kerncz_groups);
+
+ amd_pinctrl_desc.name = dev_name(&pdev->dev);
+ gpio_dev->pctrl = pinctrl_register(&amd_pinctrl_desc,
+ &pdev->dev, gpio_dev);
+ if (!gpio_dev->pctrl) {
+ dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
+ return -ENODEV;
+ }
+
+ ret = gpiochip_add(&gpio_dev->gc);
+ if (ret)
+ goto out1;
+
+ ret = gpiochip_add_pin_range(&gpio_dev->gc, dev_name(&pdev->dev),
+ 0, 0, TOTAL_NUMBER_OF_PINS);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to add pin range\n");
+ goto out2;
+ }
+
+ ret = gpiochip_irqchip_add(&gpio_dev->gc,
+ &amd_gpio_irqchip,
+ 0,
+ handle_simple_irq,
+ IRQ_TYPE_NONE);
+ if (ret) {
+ dev_err(&pdev->dev, "could not add irqchip\n");
+ ret = -ENODEV;
+ goto out2;
+ }
+
+ gpiochip_set_chained_irqchip(&gpio_dev->gc,
+ &amd_gpio_irqchip,
+ irq_base,
+ amd_gpio_irq_handler);
+
+ platform_set_drvdata(pdev, gpio_dev);
+
+ dev_dbg(&pdev->dev, "amd gpio driver loaded\n");
+ return ret;
+
+out2:
+ gpiochip_remove(&gpio_dev->gc);
+
+out1:
+ pinctrl_unregister(gpio_dev->pctrl);
+ 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);
+ pinctrl_unregister(gpio_dev->pctrl);
+
+ return 0;
+}
+
+static const struct acpi_device_id amd_gpio_acpi_match[] = {
+ { "AMD0030", 0 },
+ { },
+};
+MODULE_DEVICE_TABLE(acpi, amd_gpio_acpi_match);
+
+static struct platform_driver amd_gpio_driver = {
+ .driver = {
+ .name = "amd_gpio",
+ .owner = THIS_MODULE,
+ .acpi_match_table = ACPI_PTR(amd_gpio_acpi_match),
+ },
+ .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");
Code Review / kvmfornfv.git / blobdiff