// 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> * * Contact Information: Nehal Shah <Nehal-bakulchandra.Shah@amd.com> * Shyam Sundar S K <Shyam-sundar.S-k@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 "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 gpio_chip *gc, unsigned offset, unsigned debounce) { u32 time; u32 pin_reg; int ret = 0; 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 (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); raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); return ret; } static int amd_gpio_set_config(struct gpio_chip *gc, unsigned offset, unsigned long config) { u32 debounce; if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE) return -ENOTSUPP; debounce = pinconf_to_config_argument(config); return amd_gpio_set_debounce(gc, offset, debounce); } #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; unsigned int time; unsigned int unit; bool tmr_large; 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; char debounce_value[40]; char *debounce_enable; for (bank = 0; bank < gpio_dev->hwbank_num; 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; case 3: i = 192; pin_num = AMD_GPIO_PINS_BANK3 + i; break; default: /* Illegal bank number, ignore */ continue; } for (; i < pin_num; i++) { seq_printf(s, "pin%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; interrupt_enable = "interrupt is enabled|"; if (level == ACTIVE_LEVEL_HIGH) active_level = "Active high|"; else if (level == ACTIVE_LEVEL_LOW) active_level = "Active low|"; else if (!(pin_reg & BIT(LEVEL_TRIG_OFF)) && level == ACTIVE_LEVEL_BOTH) active_level = "Active on both|"; else active_level = "Unknown 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_S0I3)) wake_cntrl0 = "enable wakeup in S0i3 state|"; else wake_cntrl0 = "disable wakeup in S0i3 state|"; if (pin_reg & BIT(WAKE_CNTRL_OFF_S3)) wake_cntrl1 = "enable wakeup in S3 state|"; else wake_cntrl1 = "disable wakeup in S3 state|"; if (pin_reg & BIT(WAKE_CNTRL_OFF_S4)) 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|"; } 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 = "debouncing filter (high and low) enabled|"; else if ((DB_TYPE_PRESERVE_LOW_GLITCH << DB_CNTRL_OFF) == db_cntrl) debounce_enable = "debouncing filter (low) enabled|"; else debounce_enable = "debouncing filter (high) enabled|"; snprintf(debounce_value, sizeof(debounce_value), "debouncing timeout is %u (us)|", time * unit); } else { debounce_enable = "debouncing filter disabled|"; snprintf(debounce_value, sizeof(debounce_value), " "); } seq_printf(s, "%s %s %s %s %s %s\n" " %s %s %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, debounce_enable, debounce_value, 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); 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); } 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 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 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, .flags = IRQCHIP_SKIP_SET_WAKE, }; #define PIN_IRQ_PENDING (BIT(INTERRUPT_STS_OFF) | BIT(WAKE_STS_OFF)) static irqreturn_t amd_gpio_irq_handler(int irq, void *dev_id) { struct amd_gpio *gpio_dev = dev_id; struct gpio_chip *gc = &gpio_dev->gc; irqreturn_t ret = IRQ_NONE; unsigned int i, irqnr; unsigned long flags; u32 __iomem *regs; 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) || !(regval & BIT(INTERRUPT_MASK_OFF))) continue; irq = irq_find_mapping(gc->irq.domain, irqnr + i); if (irq != 0) generic_handle_irq(irq); /* Clear interrupt. * We must read the pin register again, in case the * value was changed while executing * generic_handle_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 = IRQ_HANDLED; } } /* 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 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, }; #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; int irq_base; 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; irq_base = platform_get_irq(pdev, 0); if (irq_base < 0) return irq_base; #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; #if defined(CONFIG_OF_GPIO) gpio_dev->gc.of_node = pdev->dev.of_node; #endif 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); } girq = &gpio_dev->gc.irq; girq->chip = &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, irq_base, amd_gpio_irq_handler, IRQF_SHARED, KBUILD_MODNAME, gpio_dev); if (ret) goto out2; platform_set_drvdata(pdev, 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); return 0; } #ifdef CONFIG_ACPI static const struct acpi_device_id amd_gpio_acpi_match[] = { { "AMD0030", 0 }, { "AMDI0030", 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");