diff options
Diffstat (limited to 'drivers/pinctrl/intel/pinctrl-intel.c')
| -rw-r--r-- | drivers/pinctrl/intel/pinctrl-intel.c | 1149 |
1 files changed, 1149 insertions, 0 deletions
diff --git a/drivers/pinctrl/intel/pinctrl-intel.c b/drivers/pinctrl/intel/pinctrl-intel.c new file mode 100644 index 000000000000..00768e53deec --- /dev/null +++ b/drivers/pinctrl/intel/pinctrl-intel.c @@ -0,0 +1,1149 @@ +/* + * Intel pinctrl/GPIO core driver. + * + * Copyright (C) 2015, Intel Corporation + * Authors: Mathias Nyman <mathias.nyman@linux.intel.com> + * Mika Westerberg <mika.westerberg@linux.intel.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/acpi.h> +#include <linux/gpio.h> +#include <linux/gpio/driver.h> +#include <linux/platform_device.h> +#include <linux/pm.h> +#include <linux/pinctrl/pinctrl.h> +#include <linux/pinctrl/pinmux.h> +#include <linux/pinctrl/pinconf.h> +#include <linux/pinctrl/pinconf-generic.h> + +#include "pinctrl-intel.h" + +/* Maximum number of pads in each group */ +#define NPADS_IN_GPP 24 + +/* Offset from regs */ +#define PADBAR 0x00c +#define GPI_IS 0x100 +#define GPI_GPE_STS 0x140 +#define GPI_GPE_EN 0x160 + +#define PADOWN_BITS 4 +#define PADOWN_SHIFT(p) ((p) % 8 * PADOWN_BITS) +#define PADOWN_MASK(p) (0xf << PADOWN_SHIFT(p)) + +/* Offset from pad_regs */ +#define PADCFG0 0x000 +#define PADCFG0_RXEVCFG_SHIFT 25 +#define PADCFG0_RXEVCFG_MASK (3 << PADCFG0_RXEVCFG_SHIFT) +#define PADCFG0_RXEVCFG_LEVEL 0 +#define PADCFG0_RXEVCFG_EDGE 1 +#define PADCFG0_RXEVCFG_DISABLED 2 +#define PADCFG0_RXEVCFG_EDGE_BOTH 3 +#define PADCFG0_RXINV BIT(23) +#define PADCFG0_GPIROUTIOXAPIC BIT(20) +#define PADCFG0_GPIROUTSCI BIT(19) +#define PADCFG0_GPIROUTSMI BIT(18) +#define PADCFG0_GPIROUTNMI BIT(17) +#define PADCFG0_PMODE_SHIFT 10 +#define PADCFG0_PMODE_MASK (0xf << PADCFG0_PMODE_SHIFT) +#define PADCFG0_GPIORXDIS BIT(9) +#define PADCFG0_GPIOTXDIS BIT(8) +#define PADCFG0_GPIORXSTATE BIT(1) +#define PADCFG0_GPIOTXSTATE BIT(0) + +#define PADCFG1 0x004 +#define PADCFG1_TERM_UP BIT(13) +#define PADCFG1_TERM_SHIFT 10 +#define PADCFG1_TERM_MASK (7 << PADCFG1_TERM_SHIFT) +#define PADCFG1_TERM_20K 4 +#define PADCFG1_TERM_2K 3 +#define PADCFG1_TERM_5K 2 +#define PADCFG1_TERM_1K 1 + +struct intel_pad_context { + u32 padcfg0; + u32 padcfg1; +}; + +struct intel_community_context { + u32 *intmask; +}; + +struct intel_pinctrl_context { + struct intel_pad_context *pads; + struct intel_community_context *communities; +}; + +/** + * struct intel_pinctrl - Intel pinctrl private structure + * @dev: Pointer to the device structure + * @lock: Lock to serialize register access + * @pctldesc: Pin controller description + * @pctldev: Pointer to the pin controller device + * @chip: GPIO chip in this pin controller + * @soc: SoC/PCH specific pin configuration data + * @communities: All communities in this pin controller + * @ncommunities: Number of communities in this pin controller + * @context: Configuration saved over system sleep + */ +struct intel_pinctrl { + struct device *dev; + spinlock_t lock; + struct pinctrl_desc pctldesc; + struct pinctrl_dev *pctldev; + struct gpio_chip chip; + const struct intel_pinctrl_soc_data *soc; + struct intel_community *communities; + size_t ncommunities; + struct intel_pinctrl_context context; +}; + +#define gpiochip_to_pinctrl(c) container_of(c, struct intel_pinctrl, chip) +#define pin_to_padno(c, p) ((p) - (c)->pin_base) + +static struct intel_community *intel_get_community(struct intel_pinctrl *pctrl, + unsigned pin) +{ + struct intel_community *community; + int i; + + for (i = 0; i < pctrl->ncommunities; i++) { + community = &pctrl->communities[i]; + if (pin >= community->pin_base && + pin < community->pin_base + community->npins) + return community; + } + + dev_warn(pctrl->dev, "failed to find community for pin %u\n", pin); + return NULL; +} + +static void __iomem *intel_get_padcfg(struct intel_pinctrl *pctrl, unsigned pin, + unsigned reg) +{ + const struct intel_community *community; + unsigned padno; + + community = intel_get_community(pctrl, pin); + if (!community) + return NULL; + + padno = pin_to_padno(community, pin); + return community->pad_regs + reg + padno * 8; +} + +static bool intel_pad_owned_by_host(struct intel_pinctrl *pctrl, unsigned pin) +{ + const struct intel_community *community; + unsigned padno, gpp, gpp_offset, offset; + void __iomem *padown; + + community = intel_get_community(pctrl, pin); + if (!community) + return false; + if (!community->padown_offset) + return true; + + padno = pin_to_padno(community, pin); + gpp = padno / NPADS_IN_GPP; + gpp_offset = padno % NPADS_IN_GPP; + offset = community->padown_offset + gpp * 16 + (gpp_offset / 8) * 4; + padown = community->regs + offset; + + return !(readl(padown) & PADOWN_MASK(padno)); +} + +static bool intel_pad_reserved_for_acpi(struct intel_pinctrl *pctrl, + unsigned pin) +{ + const struct intel_community *community; + unsigned padno, gpp, offset; + void __iomem *hostown; + + community = intel_get_community(pctrl, pin); + if (!community) + return true; + if (!community->hostown_offset) + return false; + + padno = pin_to_padno(community, pin); + gpp = padno / NPADS_IN_GPP; + offset = community->hostown_offset + gpp * 4; + hostown = community->regs + offset; + + return !(readl(hostown) & BIT(padno % NPADS_IN_GPP)); +} + +static bool intel_pad_locked(struct intel_pinctrl *pctrl, unsigned pin) +{ + struct intel_community *community; + unsigned padno, gpp, offset; + u32 value; + + community = intel_get_community(pctrl, pin); + if (!community) + return true; + if (!community->padcfglock_offset) + return false; + + padno = pin_to_padno(community, pin); + gpp = padno / NPADS_IN_GPP; + + /* + * If PADCFGLOCK and PADCFGLOCKTX bits are both clear for this pad, + * the pad is considered unlocked. Any other case means that it is + * either fully or partially locked and we don't touch it. + */ + offset = community->padcfglock_offset + gpp * 8; + value = readl(community->regs + offset); + if (value & BIT(pin % NPADS_IN_GPP)) + return true; + + offset = community->padcfglock_offset + 4 + gpp * 8; + value = readl(community->regs + offset); + if (value & BIT(pin % NPADS_IN_GPP)) + return true; + + return false; +} + +static bool intel_pad_usable(struct intel_pinctrl *pctrl, unsigned pin) +{ + return intel_pad_owned_by_host(pctrl, pin) && + !intel_pad_reserved_for_acpi(pctrl, pin) && + !intel_pad_locked(pctrl, pin); +} + +static int intel_get_groups_count(struct pinctrl_dev *pctldev) +{ + struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); + + return pctrl->soc->ngroups; +} + +static const char *intel_get_group_name(struct pinctrl_dev *pctldev, + unsigned group) +{ + struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); + + return pctrl->soc->groups[group].name; +} + +static int intel_get_group_pins(struct pinctrl_dev *pctldev, unsigned group, + const unsigned **pins, unsigned *npins) +{ + struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); + + *pins = pctrl->soc->groups[group].pins; + *npins = pctrl->soc->groups[group].npins; + return 0; +} + +static void intel_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s, + unsigned pin) +{ + struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); + u32 cfg0, cfg1, mode; + bool locked, acpi; + + if (!intel_pad_owned_by_host(pctrl, pin)) { + seq_puts(s, "not available"); + return; + } + + cfg0 = readl(intel_get_padcfg(pctrl, pin, PADCFG0)); + cfg1 = readl(intel_get_padcfg(pctrl, pin, PADCFG1)); + + mode = (cfg0 & PADCFG0_PMODE_MASK) >> PADCFG0_PMODE_SHIFT; + if (!mode) + seq_puts(s, "GPIO "); + else + seq_printf(s, "mode %d ", mode); + + seq_printf(s, "0x%08x 0x%08x", cfg0, cfg1); + + locked = intel_pad_locked(pctrl, pin); + acpi = intel_pad_reserved_for_acpi(pctrl, pin); + + if (locked || acpi) { + seq_puts(s, " ["); + if (locked) { + seq_puts(s, "LOCKED"); + if (acpi) + seq_puts(s, ", "); + } + if (acpi) + seq_puts(s, "ACPI"); + seq_puts(s, "]"); + } +} + +static const struct pinctrl_ops intel_pinctrl_ops = { + .get_groups_count = intel_get_groups_count, + .get_group_name = intel_get_group_name, + .get_group_pins = intel_get_group_pins, + .pin_dbg_show = intel_pin_dbg_show, +}; + +static int intel_get_functions_count(struct pinctrl_dev *pctldev) +{ + struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); + + return pctrl->soc->nfunctions; +} + +static const char *intel_get_function_name(struct pinctrl_dev *pctldev, + unsigned function) +{ + struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); + + return pctrl->soc->functions[function].name; +} + +static int intel_get_function_groups(struct pinctrl_dev *pctldev, + unsigned function, + const char * const **groups, + unsigned * const ngroups) +{ + struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); + + *groups = pctrl->soc->functions[function].groups; + *ngroups = pctrl->soc->functions[function].ngroups; + return 0; +} + +static int intel_pinmux_set_mux(struct pinctrl_dev *pctldev, unsigned function, + unsigned group) +{ + struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); + const struct intel_pingroup *grp = &pctrl->soc->groups[group]; + unsigned long flags; + int i; + + spin_lock_irqsave(&pctrl->lock, flags); + + /* + * All pins in the groups needs to be accessible and writable + * before we can enable the mux for this group. + */ + for (i = 0; i < grp->npins; i++) { + if (!intel_pad_usable(pctrl, grp->pins[i])) { + spin_unlock_irqrestore(&pctrl->lock, flags); + return -EBUSY; + } + } + + /* Now enable the mux setting for each pin in the group */ + for (i = 0; i < grp->npins; i++) { + void __iomem *padcfg0; + u32 value; + + padcfg0 = intel_get_padcfg(pctrl, grp->pins[i], PADCFG0); + value = readl(padcfg0); + + value &= ~PADCFG0_PMODE_MASK; + value |= grp->mode << PADCFG0_PMODE_SHIFT; + + writel(value, padcfg0); + } + + spin_unlock_irqrestore(&pctrl->lock, flags); + + return 0; +} + +static int intel_gpio_request_enable(struct pinctrl_dev *pctldev, + struct pinctrl_gpio_range *range, + unsigned pin) +{ + struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); + void __iomem *padcfg0; + unsigned long flags; + u32 value; + + spin_lock_irqsave(&pctrl->lock, flags); + + if (!intel_pad_usable(pctrl, pin)) { + spin_unlock_irqrestore(&pctrl->lock, flags); + return -EBUSY; + } + + padcfg0 = intel_get_padcfg(pctrl, pin, PADCFG0); + /* Put the pad into GPIO mode */ + value = readl(padcfg0) & ~PADCFG0_PMODE_MASK; + /* Disable SCI/SMI/NMI generation */ + value &= ~(PADCFG0_GPIROUTIOXAPIC | PADCFG0_GPIROUTSCI); + value &= ~(PADCFG0_GPIROUTSMI | PADCFG0_GPIROUTNMI); + /* Disable TX buffer and enable RX (this will be input) */ + value &= ~PADCFG0_GPIORXDIS; + value |= PADCFG0_GPIOTXDIS; + writel(value, padcfg0); + + spin_unlock_irqrestore(&pctrl->lock, flags); + + return 0; +} + +static int intel_gpio_set_direction(struct pinctrl_dev *pctldev, + struct pinctrl_gpio_range *range, + unsigned pin, bool input) +{ + struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); + void __iomem *padcfg0; + unsigned long flags; + u32 value; + + spin_lock_irqsave(&pctrl->lock, flags); + + padcfg0 = intel_get_padcfg(pctrl, pin, PADCFG0); + + value = readl(padcfg0); + if (input) + value |= PADCFG0_GPIOTXDIS; + else + value &= ~PADCFG0_GPIOTXDIS; + writel(value, padcfg0); + + spin_unlock_irqrestore(&pctrl->lock, flags); + + return 0; +} + +static const struct pinmux_ops intel_pinmux_ops = { + .get_functions_count = intel_get_functions_count, + .get_function_name = intel_get_function_name, + .get_function_groups = intel_get_function_groups, + .set_mux = intel_pinmux_set_mux, + .gpio_request_enable = intel_gpio_request_enable, + .gpio_set_direction = intel_gpio_set_direction, +}; + +static int intel_config_get(struct pinctrl_dev *pctldev, unsigned pin, + unsigned long *config) +{ + struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); + enum pin_config_param param = pinconf_to_config_param(*config); + u32 value, term; + u16 arg = 0; + + if (!intel_pad_owned_by_host(pctrl, pin)) + return -ENOTSUPP; + + value = readl(intel_get_padcfg(pctrl, pin, PADCFG1)); + term = (value & PADCFG1_TERM_MASK) >> PADCFG1_TERM_SHIFT; + + switch (param) { + case PIN_CONFIG_BIAS_DISABLE: + if (term) + return -EINVAL; + break; + + case PIN_CONFIG_BIAS_PULL_UP: + if (!term || !(value & PADCFG1_TERM_UP)) + return -EINVAL; + + switch (term) { + case PADCFG1_TERM_1K: + arg = 1000; + break; + case PADCFG1_TERM_2K: + arg = 2000; + break; + case PADCFG1_TERM_5K: + arg = 5000; + break; + case PADCFG1_TERM_20K: + arg = 20000; + break; + } + + break; + + case PIN_CONFIG_BIAS_PULL_DOWN: + if (!term || value & PADCFG1_TERM_UP) + return -EINVAL; + + switch (term) { + case PADCFG1_TERM_5K: + arg = 5000; + break; + case PADCFG1_TERM_20K: + arg = 20000; + break; + } + + break; + + default: + return -ENOTSUPP; + } + + *config = pinconf_to_config_packed(param, arg); + return 0; +} + +static int intel_config_set_pull(struct intel_pinctrl *pctrl, unsigned pin, + unsigned long config) +{ + unsigned param = pinconf_to_config_param(config); + unsigned arg = pinconf_to_config_argument(config); + void __iomem *padcfg1; + unsigned long flags; + int ret = 0; + u32 value; + + spin_lock_irqsave(&pctrl->lock, flags); + + padcfg1 = intel_get_padcfg(pctrl, pin, PADCFG1); + value = readl(padcfg1); + + switch (param) { + case PIN_CONFIG_BIAS_DISABLE: + value &= ~(PADCFG1_TERM_MASK | PADCFG1_TERM_UP); + break; + + case PIN_CONFIG_BIAS_PULL_UP: + value &= ~PADCFG1_TERM_MASK; + + value |= PADCFG1_TERM_UP; + + switch (arg) { + case 20000: + value |= PADCFG1_TERM_20K << PADCFG1_TERM_SHIFT; + break; + case 5000: + value |= PADCFG1_TERM_5K << PADCFG1_TERM_SHIFT; + break; + case 2000: + value |= PADCFG1_TERM_2K << PADCFG1_TERM_SHIFT; + break; + case 1000: + value |= PADCFG1_TERM_1K << PADCFG1_TERM_SHIFT; + break; + default: + ret = -EINVAL; + } + + break; + + case PIN_CONFIG_BIAS_PULL_DOWN: + value &= ~(PADCFG1_TERM_UP | PADCFG1_TERM_MASK); + + switch (arg) { + case 20000: + value |= PADCFG1_TERM_20K << PADCFG1_TERM_SHIFT; + break; + case 5000: + value |= PADCFG1_TERM_5K << PADCFG1_TERM_SHIFT; + break; + default: + ret = -EINVAL; + } + + break; + } + + if (!ret) + writel(value, padcfg1); + + spin_unlock_irqrestore(&pctrl->lock, flags); + + return ret; +} + +static int intel_config_set(struct pinctrl_dev *pctldev, unsigned pin, + unsigned long *configs, unsigned nconfigs) +{ + struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); + int i, ret; + + if (!intel_pad_usable(pctrl, pin)) + return -ENOTSUPP; + + for (i = 0; i < nconfigs; i++) { + switch (pinconf_to_config_param(configs[i])) { + case PIN_CONFIG_BIAS_DISABLE: + case PIN_CONFIG_BIAS_PULL_UP: + case PIN_CONFIG_BIAS_PULL_DOWN: + ret = intel_config_set_pull(pctrl, pin, configs[i]); + if (ret) + return ret; + break; + + default: + return -ENOTSUPP; + } + } + + return 0; +} + +static const struct pinconf_ops intel_pinconf_ops = { + .is_generic = true, + .pin_config_get = intel_config_get, + .pin_config_set = intel_config_set, +}; + +static const struct pinctrl_desc intel_pinctrl_desc = { + .pctlops = &intel_pinctrl_ops, + .pmxops = &intel_pinmux_ops, + .confops = &intel_pinconf_ops, + .owner = THIS_MODULE, +}; + +static int intel_gpio_request(struct gpio_chip *chip, unsigned offset) +{ + return pinctrl_request_gpio(chip->base + offset); +} + +static void intel_gpio_free(struct gpio_chip *chip, unsigned offset) +{ + pinctrl_free_gpio(chip->base + offset); +} + +static int intel_gpio_get(struct gpio_chip *chip, unsigned offset) +{ + struct intel_pinctrl *pctrl = gpiochip_to_pinctrl(chip); + void __iomem *reg; + + reg = intel_get_padcfg(pctrl, offset, PADCFG0); + if (!reg) + return -EINVAL; + + return !!(readl(reg) & PADCFG0_GPIORXSTATE); +} + +static void intel_gpio_set(struct gpio_chip *chip, unsigned offset, int value) +{ + struct intel_pinctrl *pctrl = gpiochip_to_pinctrl(chip); + void __iomem *reg; + + reg = intel_get_padcfg(pctrl, offset, PADCFG0); + if (reg) { + unsigned long flags; + u32 padcfg0; + + spin_lock_irqsave(&pctrl->lock, flags); + padcfg0 = readl(reg); + if (value) + padcfg0 |= PADCFG0_GPIOTXSTATE; + else + padcfg0 &= ~PADCFG0_GPIOTXSTATE; + writel(padcfg0, reg); + spin_unlock_irqrestore(&pctrl->lock, flags); + } +} + +static int intel_gpio_direction_input(struct gpio_chip *chip, unsigned offset) +{ + return pinctrl_gpio_direction_input(chip->base + offset); +} + +static int intel_gpio_direction_output(struct gpio_chip *chip, unsigned offset, + int value) +{ + intel_gpio_set(chip, offset, value); + return pinctrl_gpio_direction_output(chip->base + offset); +} + +static const struct gpio_chip intel_gpio_chip = { + .owner = THIS_MODULE, + .request = intel_gpio_request, + .free = intel_gpio_free, + .direction_input = intel_gpio_direction_input, + .direction_output = intel_gpio_direction_output, + .get = intel_gpio_get, + .set = intel_gpio_set, +}; + +static void intel_gpio_irq_ack(struct irq_data *d) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + struct intel_pinctrl *pctrl = gpiochip_to_pinctrl(gc); + const struct intel_community *community; + unsigned pin = irqd_to_hwirq(d); + + spin_lock(&pctrl->lock); + + community = intel_get_community(pctrl, pin); + if (community) { + unsigned padno = pin_to_padno(community, pin); + unsigned gpp_offset = padno % NPADS_IN_GPP; + unsigned gpp = padno / NPADS_IN_GPP; + + writel(BIT(gpp_offset), community->regs + GPI_IS + gpp * 4); + } + + spin_unlock(&pctrl->lock); +} + +static void intel_gpio_irq_mask_unmask(struct irq_data *d, bool mask) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + struct intel_pinctrl *pctrl = gpiochip_to_pinctrl(gc); + const struct intel_community *community; + unsigned pin = irqd_to_hwirq(d); + unsigned long flags; + + spin_lock_irqsave(&pctrl->lock, flags); + + community = intel_get_community(pctrl, pin); + if (community) { + unsigned padno = pin_to_padno(community, pin); + unsigned gpp_offset = padno % NPADS_IN_GPP; + unsigned gpp = padno / NPADS_IN_GPP; + void __iomem *reg; + u32 value; + + reg = community->regs + community->ie_offset + gpp * 4; + value = readl(reg); + if (mask) + value &= ~BIT(gpp_offset); + else + value |= BIT(gpp_offset); + writel(value, reg); + } + + spin_unlock_irqrestore(&pctrl->lock, flags); +} + +static void intel_gpio_irq_mask(struct irq_data *d) +{ + intel_gpio_irq_mask_unmask(d, true); +} + +static void intel_gpio_irq_unmask(struct irq_data *d) +{ + intel_gpio_irq_mask_unmask(d, false); +} + +static int intel_gpio_irq_type(struct irq_data *d, unsigned type) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + struct intel_pinctrl *pctrl = gpiochip_to_pinctrl(gc); + unsigned pin = irqd_to_hwirq(d); + unsigned long flags; + void __iomem *reg; + u32 value; + + reg = intel_get_padcfg(pctrl, pin, PADCFG0); + if (!reg) + return -EINVAL; + + spin_lock_irqsave(&pctrl->lock, flags); + + value = readl(reg); + + value &= ~(PADCFG0_RXEVCFG_MASK | PADCFG0_RXINV); + + if ((type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) { + value |= PADCFG0_RXEVCFG_EDGE_BOTH << PADCFG0_RXEVCFG_SHIFT; + } else if (type & IRQ_TYPE_EDGE_FALLING) { + value |= PADCFG0_RXEVCFG_EDGE << PADCFG0_RXEVCFG_SHIFT; + value |= PADCFG0_RXINV; + } else if (type & IRQ_TYPE_EDGE_RISING) { + value |= PADCFG0_RXEVCFG_EDGE << PADCFG0_RXEVCFG_SHIFT; + } else if (type & IRQ_TYPE_LEVEL_LOW) { + value |= PADCFG0_RXINV; + } else { + value |= PADCFG0_RXEVCFG_DISABLED << PADCFG0_RXEVCFG_SHIFT; + } + + writel(value, reg); + + if (type & IRQ_TYPE_EDGE_BOTH) + __irq_set_handler_locked(d->irq, handle_edge_irq); + else if (type & IRQ_TYPE_LEVEL_MASK) + __irq_set_handler_locked(d->irq, handle_level_irq); + + spin_unlock_irqrestore(&pctrl->lock, flags); + + return 0; +} + +static int intel_gpio_irq_wake(struct irq_data *d, unsigned int on) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + struct intel_pinctrl *pctrl = gpiochip_to_pinctrl(gc); + const struct intel_community *community; + unsigned pin = irqd_to_hwirq(d); + unsigned padno, gpp, gpp_offset; + u32 gpe_en; + + community = intel_get_community(pctrl, pin); + if (!community) + return -EINVAL; + + padno = pin_to_padno(community, pin); + gpp = padno / NPADS_IN_GPP; + gpp_offset = padno % NPADS_IN_GPP; + + /* Clear the existing wake status */ + writel(BIT(gpp_offset), community->regs + GPI_GPE_STS + gpp * 4); + + /* + * The controller will generate wake when GPE of the corresponding + * pad is enabled and it is not routed to SCI (GPIROUTSCI is not + * set). + */ + gpe_en = readl(community->regs + GPI_GPE_EN + gpp * 4); + if (on) + gpe_en |= BIT(gpp_offset); + else + gpe_en &= ~BIT(gpp_offset); + writel(gpe_en, community->regs + GPI_GPE_EN + gpp * 4); + + dev_dbg(pctrl->dev, "%sable wake for pin %u\n", on ? "en" : "dis", pin); + return 0; +} + +static void intel_gpio_community_irq_handler(struct gpio_chip *gc, + const struct intel_community *community) +{ + int gpp; + + for (gpp = 0; gpp < community->ngpps; gpp++) { + unsigned long pending, enabled, gpp_offset; + + pending = readl(community->regs + GPI_IS + gpp * 4); + enabled = readl(community->regs + community->ie_offset + + gpp * 4); + + /* Only interrupts that are enabled */ + pending &= enabled; + + for_each_set_bit(gpp_offset, &pending, NPADS_IN_GPP) { + unsigned padno, irq; + + /* + * The last group in community can have less pins + * than NPADS_IN_GPP. + */ + padno = gpp_offset + gpp * NPADS_IN_GPP; + if (padno >= community->npins) + break; + + irq = irq_find_mapping(gc->irqdomain, + community->pin_base + padno); + generic_handle_irq(irq); + } + } +} + +static void intel_gpio_irq_handler(unsigned irq, struct irq_desc *desc) +{ + struct gpio_chip *gc = irq_desc_get_handler_data(desc); + struct intel_pinctrl *pctrl = gpiochip_to_pinctrl(gc); + struct irq_chip *chip = irq_get_chip(irq); + int i; + + chained_irq_enter(chip, desc); + + /* Need to check all communities for pending interrupts */ + for (i = 0; i < pctrl->ncommunities; i++) + intel_gpio_community_irq_handler(gc, &pctrl->communities[i]); + + chained_irq_exit(chip, desc); +} + +static struct irq_chip intel_gpio_irqchip = { + .name = "intel-gpio", + .irq_ack = intel_gpio_irq_ack, + .irq_mask = intel_gpio_irq_mask, + .irq_unmask = intel_gpio_irq_unmask, + .irq_set_type = intel_gpio_irq_type, + .irq_set_wake = intel_gpio_irq_wake, +}; + +static void intel_gpio_irq_init(struct intel_pinctrl *pctrl) +{ + size_t i; + + for (i = 0; i < pctrl->ncommunities; i++) { + const struct intel_community *community; + void __iomem *base; + unsigned gpp; + + community = &pctrl->communities[i]; + base = community->regs; + + for (gpp = 0; gpp < community->ngpps; gpp++) { + /* Mask and clear all interrupts */ + writel(0, base + community->ie_offset + gpp * 4); + writel(0xffff, base + GPI_IS + gpp * 4); + } + } +} + +static int intel_gpio_probe(struct intel_pinctrl *pctrl, int irq) +{ + int ret; + + pctrl->chip = intel_gpio_chip; + + pctrl->chip.ngpio = pctrl->soc->npins; + pctrl->chip.label = dev_name(pctrl->dev); + pctrl->chip.dev = pctrl->dev; + pctrl->chip.base = -1; + + ret = gpiochip_add(&pctrl->chip); + if (ret) { + dev_err(pctrl->dev, "failed to register gpiochip\n"); + return ret; + } + + ret = gpiochip_add_pin_range(&pctrl->chip, dev_name(pctrl->dev), + 0, 0, pctrl->soc->npins); + if (ret) { + dev_err(pctrl->dev, "failed to add GPIO pin range\n"); + gpiochip_remove(&pctrl->chip); + return ret; + } + + ret = gpiochip_irqchip_add(&pctrl->chip, &intel_gpio_irqchip, 0, + handle_simple_irq, IRQ_TYPE_NONE); + if (ret) { + dev_err(pctrl->dev, "failed to add irqchip\n"); + gpiochip_remove(&pctrl->chip); + return ret; + } + + gpiochip_set_chained_irqchip(&pctrl->chip, &intel_gpio_irqchip, irq, + intel_gpio_irq_handler); + return 0; +} + +static int intel_pinctrl_pm_init(struct intel_pinctrl *pctrl) +{ +#ifdef CONFIG_PM_SLEEP + const struct intel_pinctrl_soc_data *soc = pctrl->soc; + struct intel_community_context *communities; + struct intel_pad_context *pads; + int i; + + pads = devm_kcalloc(pctrl->dev, soc->npins, sizeof(*pads), GFP_KERNEL); + if (!pads) + return -ENOMEM; + + communities = devm_kcalloc(pctrl->dev, pctrl->ncommunities, + sizeof(*communities), GFP_KERNEL); + if (!communities) + return -ENOMEM; + + + for (i = 0; i < pctrl->ncommunities; i++) { + struct intel_community *community = &pctrl->communities[i]; + u32 *intmask; + + intmask = devm_kcalloc(pctrl->dev, community->ngpps, + sizeof(*intmask), GFP_KERNEL); + if (!intmask) + return -ENOMEM; + + communities[i].intmask = intmask; + } + + pctrl->context.pads = pads; + pctrl->context.communities = communities; +#endif + + return 0; +} + +int intel_pinctrl_probe(struct platform_device *pdev, + const struct intel_pinctrl_soc_data *soc_data) +{ + struct intel_pinctrl *pctrl; + int i, ret, irq; + + if (!soc_data) + return -EINVAL; + + pctrl = devm_kzalloc(&pdev->dev, sizeof(*pctrl), GFP_KERNEL); + if (!pctrl) + return -ENOMEM; + + pctrl->dev = &pdev->dev; + pctrl->soc = soc_data; + spin_lock_init(&pctrl->lock); + + /* + * Make a copy of the communities which we can use to hold pointers + * to the registers. + */ + pctrl->ncommunities = pctrl->soc->ncommunities; + pctrl->communities = devm_kcalloc(&pdev->dev, pctrl->ncommunities, + sizeof(*pctrl->communities), GFP_KERNEL); + if (!pctrl->communities) + return -ENOMEM; + + for (i = 0; i < pctrl->ncommunities; i++) { + struct intel_community *community = &pctrl->communities[i]; + struct resource *res; + void __iomem *regs; + u32 padbar; + + *community = pctrl->soc->communities[i]; + + res = platform_get_resource(pdev, IORESOURCE_MEM, + community->barno); + regs = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(regs)) + return PTR_ERR(regs); + + /* Read offset of the pad configuration registers */ + padbar = readl(regs + PADBAR); + + community->regs = regs; + community->pad_regs = regs + padbar; + community->ngpps = DIV_ROUND_UP(community->npins, NPADS_IN_GPP); + } + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_err(&pdev->dev, "failed to get interrupt number\n"); + return irq; + } + + ret = intel_pinctrl_pm_init(pctrl); + if (ret) + return ret; + + pctrl->pctldesc = intel_pinctrl_desc; + pctrl->pctldesc.name = dev_name(&pdev->dev); + pctrl->pctldesc.pins = pctrl->soc->pins; + pctrl->pctldesc.npins = pctrl->soc->npins; + + pctrl->pctldev = pinctrl_register(&pctrl->pctldesc, &pdev->dev, pctrl); + if (!pctrl->pctldev) { + dev_err(&pdev->dev, "failed to register pinctrl driver\n"); + return -ENODEV; + } + + ret = intel_gpio_probe(pctrl, irq); + if (ret) { + pinctrl_unregister(pctrl->pctldev); + return ret; + } + + platform_set_drvdata(pdev, pctrl); + + return 0; +} +EXPORT_SYMBOL_GPL(intel_pinctrl_probe); + +int intel_pinctrl_remove(struct platform_device *pdev) +{ + struct intel_pinctrl *pctrl = platform_get_drvdata(pdev); + + gpiochip_remove(&pctrl->chip); + pinctrl_unregister(pctrl->pctldev); + + return 0; +} +EXPORT_SYMBOL_GPL(intel_pinctrl_remove); + +#ifdef CONFIG_PM_SLEEP +int intel_pinctrl_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct intel_pinctrl *pctrl = platform_get_drvdata(pdev); + struct intel_community_context *communities; + struct intel_pad_context *pads; + int i; + + pads = pctrl->context.pads; + for (i = 0; i < pctrl->soc->npins; i++) { + const struct pinctrl_pin_desc *desc = &pctrl->soc->pins[i]; + u32 val; + + if (!intel_pad_usable(pctrl, desc->number)) + continue; + + val = readl(intel_get_padcfg(pctrl, desc->number, PADCFG0)); + pads[i].padcfg0 = val & ~PADCFG0_GPIORXSTATE; + val = readl(intel_get_padcfg(pctrl, desc->number, PADCFG1)); + pads[i].padcfg1 = val; + } + + communities = pctrl->context.communities; + for (i = 0; i < pctrl->ncommunities; i++) { + struct intel_community *community = &pctrl->communities[i]; + void __iomem *base; + unsigned gpp; + + base = community->regs + community->ie_offset; + for (gpp = 0; gpp < community->ngpps; gpp++) + communities[i].intmask[gpp] = readl(base + gpp * 4); + } + + return 0; +} +EXPORT_SYMBOL_GPL(intel_pinctrl_suspend); + +int intel_pinctrl_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct intel_pinctrl *pctrl = platform_get_drvdata(pdev); + const struct intel_community_context *communities; + const struct intel_pad_context *pads; + int i; + + /* Mask all interrupts */ + intel_gpio_irq_init(pctrl); + + pads = pctrl->context.pads; + for (i = 0; i < pctrl->soc->npins; i++) { + const struct pinctrl_pin_desc *desc = &pctrl->soc->pins[i]; + void __iomem *padcfg; + u32 val; + + if (!intel_pad_usable(pctrl, desc->number)) + continue; + + padcfg = intel_get_padcfg(pctrl, desc->number, PADCFG0); + val = readl(padcfg) & ~PADCFG0_GPIORXSTATE; + if (val != pads[i].padcfg0) { + writel(pads[i].padcfg0, padcfg); + dev_dbg(dev, "restored pin %u padcfg0 %#08x\n", + desc->number, readl(padcfg)); + } + + padcfg = intel_get_padcfg(pctrl, desc->number, PADCFG1); + val = readl(padcfg); + if (val != pads[i].padcfg1) { + writel(pads[i].padcfg1, padcfg); + dev_dbg(dev, "restored pin %u padcfg1 %#08x\n", + desc->number, readl(padcfg)); + } + } + + communities = pctrl->context.communities; + for (i = 0; i < pctrl->ncommunities; i++) { + struct intel_community *community = &pctrl->communities[i]; + void __iomem *base; + unsigned gpp; + + base = community->regs + community->ie_offset; + for (gpp = 0; gpp < community->ngpps; gpp++) { + writel(communities[i].intmask[gpp], base + gpp * 4); + dev_dbg(dev, "restored mask %d/%u %#08x\n", i, gpp, + readl(base + gpp * 4)); + } + } + + return 0; +} +EXPORT_SYMBOL_GPL(intel_pinctrl_resume); +#endif + +MODULE_AUTHOR("Mathias Nyman <mathias.nyman@linux.intel.com>"); +MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>"); +MODULE_DESCRIPTION("Intel pinctrl/GPIO core driver"); +MODULE_LICENSE("GPL v2"); |
