diff options
Diffstat (limited to 'drivers/pinctrl/pinctrl-amd.c')
| -rw-r--r-- | drivers/pinctrl/pinctrl-amd.c | 1215 |
1 files changed, 1215 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinctrl-amd.c b/drivers/pinctrl/pinctrl-amd.c new file mode 100644 index 0000000000..86034c457c --- /dev/null +++ b/drivers/pinctrl/pinctrl-amd.c @@ -0,0 +1,1215 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * GPIO driver for AMD + * + * Copyright (c) 2014,2015 AMD Corporation. + * Authors: Ken Xue <Ken.Xue@amd.com> + * Wu, Jeff <Jeff.Wu@amd.com> + * + */ + +#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/driver.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 <linux/pinctrl/pinmux.h> +#include <linux/suspend.h> + +#include "core.h" +#include "pinctrl-utils.h" +#include "pinctrl-amd.h" + +static int amd_gpio_get_direction(struct gpio_chip *gc, unsigned offset) +{ + unsigned long flags; + u32 pin_reg; + struct amd_gpio *gpio_dev = gpiochip_get_data(gc); + + raw_spin_lock_irqsave(&gpio_dev->lock, flags); + pin_reg = readl(gpio_dev->base + offset * 4); + raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); + + if (pin_reg & BIT(OUTPUT_ENABLE_OFF)) + return GPIO_LINE_DIRECTION_OUT; + + return GPIO_LINE_DIRECTION_IN; +} + +static int amd_gpio_direction_input(struct gpio_chip *gc, unsigned offset) +{ + unsigned long flags; + u32 pin_reg; + struct amd_gpio *gpio_dev = gpiochip_get_data(gc); + + raw_spin_lock_irqsave(&gpio_dev->lock, flags); + pin_reg = readl(gpio_dev->base + offset * 4); + pin_reg &= ~BIT(OUTPUT_ENABLE_OFF); + writel(pin_reg, gpio_dev->base + offset * 4); + raw_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 = gpiochip_get_data(gc); + + raw_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); + raw_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 = gpiochip_get_data(gc); + + raw_spin_lock_irqsave(&gpio_dev->lock, flags); + pin_reg = readl(gpio_dev->base + offset * 4); + raw_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 = gpiochip_get_data(gc); + + raw_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); + raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); +} + +static int amd_gpio_set_debounce(struct amd_gpio *gpio_dev, unsigned int offset, + unsigned int debounce) +{ + u32 time; + u32 pin_reg; + int ret = 0; + + /* Use special handling for Pin0 debounce */ + if (offset == 0) { + pin_reg = readl(gpio_dev->base + WAKE_INT_MASTER_REG); + if (pin_reg & INTERNAL_GPIO0_DEBOUNCE) + debounce = 0; + } + + 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 / 15625; + 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 << DB_CNTRL_OFF); + 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 << DB_CNTRL_OFF); + } + writel(pin_reg, gpio_dev->base + offset * 4); + + return ret; +} + +#ifdef CONFIG_DEBUG_FS +static void amd_gpio_dbg_show(struct seq_file *s, struct gpio_chip *gc) +{ + u32 pin_reg; + u32 db_cntrl; + unsigned long flags; + unsigned int bank, i, pin_num; + struct amd_gpio *gpio_dev = gpiochip_get_data(gc); + + bool tmr_out_unit; + bool tmr_large; + + char *level_trig; + char *active_level; + char *interrupt_mask; + char *wake_cntrl0; + char *wake_cntrl1; + char *wake_cntrl2; + char *pin_sts; + char *interrupt_sts; + char *wake_sts; + char *orientation; + char debounce_value[40]; + char *debounce_enable; + char *wake_cntrlz; + + seq_printf(s, "WAKE_INT_MASTER_REG: 0x%08x\n", readl(gpio_dev->base + WAKE_INT_MASTER_REG)); + for (bank = 0; bank < gpio_dev->hwbank_num; bank++) { + unsigned int time = 0; + unsigned int unit = 0; + + 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; + case 3: + i = 192; + pin_num = AMD_GPIO_PINS_BANK3 + i; + break; + default: + /* Illegal bank number, ignore */ + continue; + } + seq_printf(s, "GPIO bank%d\n", bank); + seq_puts(s, "gpio\t int|active|trigger|S0i3| S3|S4/S5| Z|wake|pull| orient| debounce|reg\n"); + for (; i < pin_num; i++) { + seq_printf(s, "#%d\t", i); + raw_spin_lock_irqsave(&gpio_dev->lock, flags); + pin_reg = readl(gpio_dev->base + i * 4); + raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); + + if (pin_reg & BIT(INTERRUPT_ENABLE_OFF)) { + u8 level = (pin_reg >> ACTIVE_LEVEL_OFF) & + ACTIVE_LEVEL_MASK; + + if (level == ACTIVE_LEVEL_HIGH) + active_level = "↑"; + else if (level == ACTIVE_LEVEL_LOW) + active_level = "↓"; + else if (!(pin_reg & BIT(LEVEL_TRIG_OFF)) && + level == ACTIVE_LEVEL_BOTH) + active_level = "b"; + else + active_level = "?"; + + if (pin_reg & BIT(LEVEL_TRIG_OFF)) + level_trig = "level"; + else + level_trig = " edge"; + + if (pin_reg & BIT(INTERRUPT_MASK_OFF)) + interrupt_mask = "😛"; + else + interrupt_mask = "😷"; + + if (pin_reg & BIT(INTERRUPT_STS_OFF)) + interrupt_sts = "🔥"; + else + interrupt_sts = " "; + + seq_printf(s, "%s %s| %s| %s|", + interrupt_sts, + interrupt_mask, + active_level, + level_trig); + } else + seq_puts(s, " ∅| | |"); + + if (pin_reg & BIT(WAKE_CNTRL_OFF_S0I3)) + wake_cntrl0 = "⏰"; + else + wake_cntrl0 = " "; + seq_printf(s, " %s| ", wake_cntrl0); + + if (pin_reg & BIT(WAKE_CNTRL_OFF_S3)) + wake_cntrl1 = "⏰"; + else + wake_cntrl1 = " "; + seq_printf(s, "%s|", wake_cntrl1); + + if (pin_reg & BIT(WAKE_CNTRL_OFF_S4)) + wake_cntrl2 = "⏰"; + else + wake_cntrl2 = " "; + seq_printf(s, " %s|", wake_cntrl2); + + if (pin_reg & BIT(WAKECNTRL_Z_OFF)) + wake_cntrlz = "⏰"; + else + wake_cntrlz = " "; + seq_printf(s, "%s|", wake_cntrlz); + + if (pin_reg & BIT(WAKE_STS_OFF)) + wake_sts = "🔥"; + else + wake_sts = " "; + seq_printf(s, " %s|", wake_sts); + + if (pin_reg & BIT(PULL_UP_ENABLE_OFF)) { + seq_puts(s, " ↑ |"); + } else if (pin_reg & BIT(PULL_DOWN_ENABLE_OFF)) { + seq_puts(s, " ↓ |"); + } else { + seq_puts(s, " |"); + } + + if (pin_reg & BIT(OUTPUT_ENABLE_OFF)) { + pin_sts = "output"; + if (pin_reg & BIT(OUTPUT_VALUE_OFF)) + orientation = "↑"; + else + orientation = "↓"; + } else { + pin_sts = "input "; + if (pin_reg & BIT(PIN_STS_OFF)) + orientation = "↑"; + else + orientation = "↓"; + } + seq_printf(s, "%s %s|", pin_sts, orientation); + + db_cntrl = (DB_CNTRl_MASK << DB_CNTRL_OFF) & pin_reg; + if (db_cntrl) { + tmr_out_unit = pin_reg & BIT(DB_TMR_OUT_UNIT_OFF); + tmr_large = pin_reg & BIT(DB_TMR_LARGE_OFF); + time = pin_reg & DB_TMR_OUT_MASK; + if (tmr_large) { + if (tmr_out_unit) + unit = 62500; + else + unit = 15625; + } else { + if (tmr_out_unit) + unit = 244; + else + unit = 61; + } + if ((DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF) == db_cntrl) + debounce_enable = "b"; + else if ((DB_TYPE_PRESERVE_LOW_GLITCH << DB_CNTRL_OFF) == db_cntrl) + debounce_enable = "↓"; + else + debounce_enable = "↑"; + snprintf(debounce_value, sizeof(debounce_value), "%06u", time * unit); + seq_printf(s, "%s (🕑 %sus)|", debounce_enable, debounce_value); + } else { + seq_puts(s, " |"); + } + seq_printf(s, "0x%x\n", 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 = gpiochip_get_data(gc); + + gpiochip_enable_irq(gc, d->hwirq); + + raw_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); + raw_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 = gpiochip_get_data(gc); + + raw_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); + raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); + + gpiochip_disable_irq(gc, d->hwirq); +} + +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 = gpiochip_get_data(gc); + + raw_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); + raw_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 = gpiochip_get_data(gc); + + raw_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); + raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); +} + +static int amd_gpio_irq_set_wake(struct irq_data *d, unsigned int on) +{ + u32 pin_reg; + unsigned long flags; + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + struct amd_gpio *gpio_dev = gpiochip_get_data(gc); + u32 wake_mask = BIT(WAKE_CNTRL_OFF_S0I3) | BIT(WAKE_CNTRL_OFF_S3); + int err; + + raw_spin_lock_irqsave(&gpio_dev->lock, flags); + pin_reg = readl(gpio_dev->base + (d->hwirq)*4); + + if (on) + pin_reg |= wake_mask; + else + pin_reg &= ~wake_mask; + + writel(pin_reg, gpio_dev->base + (d->hwirq)*4); + raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); + + if (on) + 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); + + if (regval & PIN_IRQ_PENDING) + pm_pr_dbg("GPIO %d is active: 0x%x", + irqnr + i, regval); + + /* caused wake on resume context for shared IRQ */ + if (irq < 0 && (regval & BIT(WAKE_STS_OFF))) + return true; + + if (!(regval & PIN_IRQ_PENDING) || + !(regval & BIT(INTERRUPT_MASK_OFF))) + continue; + generic_handle_domain_irq_safe(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 the line is not an irq, 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 (!gpiochip_line_is_irq(gc, irqnr + i)) { + regval &= ~BIT(INTERRUPT_MASK_OFF); + dev_dbg(&gpio_dev->pdev->dev, + "Disabling spurious GPIO IRQ %d\n", + irqnr + i); + } else { + ret = true; + } + writel(regval, regs + i); + raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); + } + } + /* 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_ENABLE_OFF) & BIT(0); + break; + + case PIN_CONFIG_DRIVE_STRENGTH: + arg = (pin_reg >> DRV_STRENGTH_SEL_OFF) & DRV_STRENGTH_SEL_MASK; + break; + + default: + dev_dbg(&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 int 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: + ret = amd_gpio_set_debounce(gpio_dev, pin, arg); + goto out_unlock; + + 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_ENABLE_OFF); + pin_reg |= (arg & 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_dbg(&gpio_dev->pdev->dev, + "Invalid config param %04x\n", param); + ret = -ENOTSUPP; + } + + writel(pin_reg, gpio_dev->base + pin*4); + } +out_unlock: + 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 int amd_gpio_set_config(struct gpio_chip *gc, unsigned int pin, + unsigned long config) +{ + struct amd_gpio *gpio_dev = gpiochip_get_data(gc); + + return amd_pinconf_set(gpio_dev->pctrl, pin, &config, 1); +} + +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(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 + pin * 4); + pin_reg &= ~mask; + writel(pin_reg, gpio_dev->base + pin * 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; + unsigned long flags; + int i; + + for (i = 0; i < desc->npins; i++) { + int pin = desc->pins[i].number; + + if (!amd_gpio_should_save(gpio_dev, pin)) + continue; + + raw_spin_lock_irqsave(&gpio_dev->lock, flags); + gpio_dev->saved_regs[i] = readl(gpio_dev->base + pin * 4) & ~PIN_IRQ_PENDING; + + /* mask any interrupts not intended to be a wake source */ + if (!(gpio_dev->saved_regs[i] & WAKE_SOURCE)) { + writel(gpio_dev->saved_regs[i] & ~BIT(INTERRUPT_MASK_OFF), + gpio_dev->base + pin * 4); + pm_pr_dbg("Disabling GPIO #%d interrupt for suspend.\n", + pin); + } + + raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); + } + + 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; + unsigned long flags; + int i; + + for (i = 0; i < desc->npins; i++) { + int pin = desc->pins[i].number; + + if (!amd_gpio_should_save(gpio_dev, pin)) + continue; + + raw_spin_lock_irqsave(&gpio_dev->lock, flags); + gpio_dev->saved_regs[i] |= readl(gpio_dev->base + pin * 4) & PIN_IRQ_PENDING; + writel(gpio_dev->saved_regs[i], gpio_dev->base + pin * 4); + raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); + } + + 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 int amd_get_functions_count(struct pinctrl_dev *pctldev) +{ + return ARRAY_SIZE(pmx_functions); +} + +static const char *amd_get_fname(struct pinctrl_dev *pctrldev, unsigned int selector) +{ + return pmx_functions[selector].name; +} + +static int amd_get_groups(struct pinctrl_dev *pctrldev, unsigned int selector, + const char * const **groups, + unsigned int * const num_groups) +{ + struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctrldev); + + if (!gpio_dev->iomux_base) { + dev_err(&gpio_dev->pdev->dev, "iomux function %d group not supported\n", selector); + return -EINVAL; + } + + *groups = pmx_functions[selector].groups; + *num_groups = pmx_functions[selector].ngroups; + return 0; +} + +static int amd_set_mux(struct pinctrl_dev *pctrldev, unsigned int function, unsigned int group) +{ + struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctrldev); + struct device *dev = &gpio_dev->pdev->dev; + struct pin_desc *pd; + int ind, index; + + if (!gpio_dev->iomux_base) + return -EINVAL; + + for (index = 0; index < NSELECTS; index++) { + if (strcmp(gpio_dev->groups[group].name, pmx_functions[function].groups[index])) + continue; + + if (readb(gpio_dev->iomux_base + pmx_functions[function].index) == + FUNCTION_INVALID) { + dev_err(dev, "IOMUX_GPIO 0x%x not present or supported\n", + pmx_functions[function].index); + return -EINVAL; + } + + writeb(index, gpio_dev->iomux_base + pmx_functions[function].index); + + if (index != (readb(gpio_dev->iomux_base + pmx_functions[function].index) & + FUNCTION_MASK)) { + dev_err(dev, "IOMUX_GPIO 0x%x not present or supported\n", + pmx_functions[function].index); + return -EINVAL; + } + + for (ind = 0; ind < gpio_dev->groups[group].npins; ind++) { + if (strncmp(gpio_dev->groups[group].name, "IMX_F", strlen("IMX_F"))) + continue; + + pd = pin_desc_get(gpio_dev->pctrl, gpio_dev->groups[group].pins[ind]); + pd->mux_owner = gpio_dev->groups[group].name; + } + break; + } + + return 0; +} + +static const struct pinmux_ops amd_pmxops = { + .get_functions_count = amd_get_functions_count, + .get_function_name = amd_get_fname, + .get_function_groups = amd_get_groups, + .set_mux = amd_set_mux, +}; + +static struct pinctrl_desc amd_pinctrl_desc = { + .pins = kerncz_pins, + .npins = ARRAY_SIZE(kerncz_pins), + .pctlops = &amd_pinctrl_ops, + .pmxops = &amd_pmxops, + .confops = &amd_pinconf_ops, + .owner = THIS_MODULE, +}; + +static void amd_get_iomux_res(struct amd_gpio *gpio_dev) +{ + struct pinctrl_desc *desc = &amd_pinctrl_desc; + struct device *dev = &gpio_dev->pdev->dev; + int index; + + index = device_property_match_string(dev, "pinctrl-resource-names", "iomux"); + if (index < 0) { + dev_dbg(dev, "iomux not supported\n"); + goto out_no_pinmux; + } + + gpio_dev->iomux_base = devm_platform_ioremap_resource(gpio_dev->pdev, index); + if (IS_ERR(gpio_dev->iomux_base)) { + dev_dbg(dev, "iomux not supported %d io resource\n", index); + goto out_no_pinmux; + } + + return; + +out_no_pinmux: + desc->pmxops = NULL; +} + +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); + + gpio_dev->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res); + if (IS_ERR(gpio_dev->base)) { + dev_err(&pdev->dev, "Failed to get gpio io resource.\n"); + return PTR_ERR(gpio_dev->base); + } + + 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); + amd_get_iomux_res(gpio_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_AUTHOR("Ken Xue <Ken.Xue@amd.com>, Jeff Wu <Jeff.Wu@amd.com>"); +MODULE_DESCRIPTION("AMD GPIO pinctrl driver"); |