diff options
Diffstat (limited to 'drivers/pinctrl/intel/pinctrl-intel.c')
| -rw-r--r-- | drivers/pinctrl/intel/pinctrl-intel.c | 1884 |
1 files changed, 1884 insertions, 0 deletions
diff --git a/drivers/pinctrl/intel/pinctrl-intel.c b/drivers/pinctrl/intel/pinctrl-intel.c new file mode 100644 index 000000000..954a41226 --- /dev/null +++ b/drivers/pinctrl/intel/pinctrl-intel.c @@ -0,0 +1,1884 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * 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> + */ + +#include <linux/acpi.h> +#include <linux/gpio/driver.h> +#include <linux/interrupt.h> +#include <linux/log2.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/property.h> +#include <linux/time.h> + +#include <linux/pinctrl/pinctrl.h> +#include <linux/pinctrl/pinmux.h> +#include <linux/pinctrl/pinconf.h> +#include <linux/pinctrl/pinconf-generic.h> + +#include "../core.h" +#include "pinctrl-intel.h" + +/* Offset from regs */ +#define REVID 0x000 +#define REVID_SHIFT 16 +#define REVID_MASK GENMASK(31, 16) + +#define CAPLIST 0x004 +#define CAPLIST_ID_SHIFT 16 +#define CAPLIST_ID_MASK GENMASK(23, 16) +#define CAPLIST_ID_GPIO_HW_INFO 1 +#define CAPLIST_ID_PWM 2 +#define CAPLIST_ID_BLINK 3 +#define CAPLIST_ID_EXP 4 +#define CAPLIST_NEXT_SHIFT 0 +#define CAPLIST_NEXT_MASK GENMASK(15, 0) + +#define PADBAR 0x00c + +#define PADOWN_BITS 4 +#define PADOWN_SHIFT(p) ((p) % 8 * PADOWN_BITS) +#define PADOWN_MASK(p) (GENMASK(3, 0) << PADOWN_SHIFT(p)) +#define PADOWN_GPP(p) ((p) / 8) + +/* Offset from pad_regs */ +#define PADCFG0 0x000 +#define PADCFG0_RXEVCFG_SHIFT 25 +#define PADCFG0_RXEVCFG_MASK GENMASK(26, 25) +#define PADCFG0_RXEVCFG_LEVEL 0 +#define PADCFG0_RXEVCFG_EDGE 1 +#define PADCFG0_RXEVCFG_DISABLED 2 +#define PADCFG0_RXEVCFG_EDGE_BOTH 3 +#define PADCFG0_PREGFRXSEL BIT(24) +#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 GENMASK(13, 10) +#define PADCFG0_PMODE_GPIO 0 +#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 GENMASK(12, 10) +#define PADCFG1_TERM_20K BIT(2) +#define PADCFG1_TERM_5K BIT(1) +#define PADCFG1_TERM_1K BIT(0) +#define PADCFG1_TERM_833 (BIT(1) | BIT(0)) + +#define PADCFG2 0x008 +#define PADCFG2_DEBEN BIT(0) +#define PADCFG2_DEBOUNCE_SHIFT 1 +#define PADCFG2_DEBOUNCE_MASK GENMASK(4, 1) + +#define DEBOUNCE_PERIOD_NSEC 31250 + +struct intel_pad_context { + u32 padcfg0; + u32 padcfg1; + u32 padcfg2; +}; + +struct intel_community_context { + u32 *intmask; + u32 *hostown; +}; + +#define pin_to_padno(c, p) ((p) - (c)->pin_base) +#define padgroup_offset(g, p) ((p) - (g)->base) + +static struct intel_community *intel_get_community(struct intel_pinctrl *pctrl, + unsigned int 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 const struct intel_padgroup * +intel_community_get_padgroup(const struct intel_community *community, + unsigned int pin) +{ + int i; + + for (i = 0; i < community->ngpps; i++) { + const struct intel_padgroup *padgrp = &community->gpps[i]; + + if (pin >= padgrp->base && pin < padgrp->base + padgrp->size) + return padgrp; + } + + return NULL; +} + +static void __iomem *intel_get_padcfg(struct intel_pinctrl *pctrl, + unsigned int pin, unsigned int reg) +{ + const struct intel_community *community; + unsigned int padno; + size_t nregs; + + community = intel_get_community(pctrl, pin); + if (!community) + return NULL; + + padno = pin_to_padno(community, pin); + nregs = (community->features & PINCTRL_FEATURE_DEBOUNCE) ? 4 : 2; + + if (reg >= nregs * 4) + return NULL; + + return community->pad_regs + reg + padno * nregs * 4; +} + +static bool intel_pad_owned_by_host(struct intel_pinctrl *pctrl, unsigned int pin) +{ + const struct intel_community *community; + const struct intel_padgroup *padgrp; + unsigned int gpp, offset, gpp_offset; + void __iomem *padown; + + community = intel_get_community(pctrl, pin); + if (!community) + return false; + if (!community->padown_offset) + return true; + + padgrp = intel_community_get_padgroup(community, pin); + if (!padgrp) + return false; + + gpp_offset = padgroup_offset(padgrp, pin); + gpp = PADOWN_GPP(gpp_offset); + offset = community->padown_offset + padgrp->padown_num * 4 + gpp * 4; + padown = community->regs + offset; + + return !(readl(padown) & PADOWN_MASK(gpp_offset)); +} + +static bool intel_pad_acpi_mode(struct intel_pinctrl *pctrl, unsigned int pin) +{ + const struct intel_community *community; + const struct intel_padgroup *padgrp; + unsigned int offset, gpp_offset; + void __iomem *hostown; + + community = intel_get_community(pctrl, pin); + if (!community) + return true; + if (!community->hostown_offset) + return false; + + padgrp = intel_community_get_padgroup(community, pin); + if (!padgrp) + return true; + + gpp_offset = padgroup_offset(padgrp, pin); + offset = community->hostown_offset + padgrp->reg_num * 4; + hostown = community->regs + offset; + + return !(readl(hostown) & BIT(gpp_offset)); +} + +/** + * enum - Locking variants of the pad configuration + * + * @PAD_UNLOCKED: pad is fully controlled by the configuration registers + * @PAD_LOCKED: pad configuration registers, except TX state, are locked + * @PAD_LOCKED_TX: pad configuration TX state is locked + * @PAD_LOCKED_FULL: pad configuration registers are locked completely + * + * Locking is considered as read-only mode for corresponding registers and + * their respective fields. That said, TX state bit is locked separately from + * the main locking scheme. + */ +enum { + PAD_UNLOCKED = 0, + PAD_LOCKED = 1, + PAD_LOCKED_TX = 2, + PAD_LOCKED_FULL = PAD_LOCKED | PAD_LOCKED_TX, +}; + +static int intel_pad_locked(struct intel_pinctrl *pctrl, unsigned int pin) +{ + struct intel_community *community; + const struct intel_padgroup *padgrp; + unsigned int offset, gpp_offset; + u32 value; + int ret = PAD_UNLOCKED; + + community = intel_get_community(pctrl, pin); + if (!community) + return PAD_LOCKED_FULL; + if (!community->padcfglock_offset) + return PAD_UNLOCKED; + + padgrp = intel_community_get_padgroup(community, pin); + if (!padgrp) + return PAD_LOCKED_FULL; + + gpp_offset = padgroup_offset(padgrp, pin); + + /* + * 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. + */ + offset = community->padcfglock_offset + 0 + padgrp->reg_num * 8; + value = readl(community->regs + offset); + if (value & BIT(gpp_offset)) + ret |= PAD_LOCKED; + + offset = community->padcfglock_offset + 4 + padgrp->reg_num * 8; + value = readl(community->regs + offset); + if (value & BIT(gpp_offset)) + ret |= PAD_LOCKED_TX; + + return ret; +} + +static bool intel_pad_is_unlocked(struct intel_pinctrl *pctrl, unsigned int pin) +{ + return (intel_pad_locked(pctrl, pin) & PAD_LOCKED) == PAD_UNLOCKED; +} + +static bool intel_pad_usable(struct intel_pinctrl *pctrl, unsigned int pin) +{ + return intel_pad_owned_by_host(pctrl, pin) && intel_pad_is_unlocked(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 int group) +{ + struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); + + return pctrl->soc->groups[group].grp.name; +} + +static int intel_get_group_pins(struct pinctrl_dev *pctldev, unsigned int group, + const unsigned int **pins, unsigned int *npins) +{ + struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); + + *pins = pctrl->soc->groups[group].grp.pins; + *npins = pctrl->soc->groups[group].grp.npins; + return 0; +} + +static void intel_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s, + unsigned int pin) +{ + struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); + void __iomem *padcfg; + u32 cfg0, cfg1, mode; + int locked; + bool 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 == PADCFG0_PMODE_GPIO) + seq_puts(s, "GPIO "); + else + seq_printf(s, "mode %d ", mode); + + seq_printf(s, "0x%08x 0x%08x", cfg0, cfg1); + + /* Dump the additional PADCFG registers if available */ + padcfg = intel_get_padcfg(pctrl, pin, PADCFG2); + if (padcfg) + seq_printf(s, " 0x%08x", readl(padcfg)); + + locked = intel_pad_locked(pctrl, pin); + acpi = intel_pad_acpi_mode(pctrl, pin); + + if (locked || acpi) { + seq_puts(s, " ["); + if (locked) + seq_puts(s, "LOCKED"); + if ((locked & PAD_LOCKED_FULL) == PAD_LOCKED_TX) + seq_puts(s, " tx"); + else if ((locked & PAD_LOCKED_FULL) == PAD_LOCKED_FULL) + seq_puts(s, " full"); + + if (locked && 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 int 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 int function, + const char * const **groups, + unsigned int * 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 int function, unsigned int group) +{ + struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); + const struct intel_pingroup *grp = &pctrl->soc->groups[group]; + unsigned long flags; + int i; + + raw_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->grp.npins; i++) { + if (!intel_pad_usable(pctrl, grp->grp.pins[i])) { + raw_spin_unlock_irqrestore(&pctrl->lock, flags); + return -EBUSY; + } + } + + /* Now enable the mux setting for each pin in the group */ + for (i = 0; i < grp->grp.npins; i++) { + void __iomem *padcfg0; + u32 value; + + padcfg0 = intel_get_padcfg(pctrl, grp->grp.pins[i], PADCFG0); + value = readl(padcfg0); + + value &= ~PADCFG0_PMODE_MASK; + + if (grp->modes) + value |= grp->modes[i] << PADCFG0_PMODE_SHIFT; + else + value |= grp->mode << PADCFG0_PMODE_SHIFT; + + writel(value, padcfg0); + } + + raw_spin_unlock_irqrestore(&pctrl->lock, flags); + + return 0; +} + +static void __intel_gpio_set_direction(void __iomem *padcfg0, bool input) +{ + u32 value; + + value = readl(padcfg0); + if (input) { + value &= ~PADCFG0_GPIORXDIS; + value |= PADCFG0_GPIOTXDIS; + } else { + value &= ~PADCFG0_GPIOTXDIS; + value |= PADCFG0_GPIORXDIS; + } + writel(value, padcfg0); +} + +static int __intel_gpio_get_gpio_mode(u32 value) +{ + return (value & PADCFG0_PMODE_MASK) >> PADCFG0_PMODE_SHIFT; +} + +static int intel_gpio_get_gpio_mode(void __iomem *padcfg0) +{ + return __intel_gpio_get_gpio_mode(readl(padcfg0)); +} + +static void intel_gpio_set_gpio_mode(void __iomem *padcfg0) +{ + u32 value; + + value = readl(padcfg0); + + /* Put the pad into GPIO mode */ + value &= ~PADCFG0_PMODE_MASK; + value |= PADCFG0_PMODE_GPIO; + + /* Disable TX buffer and enable RX (this will be input) */ + value &= ~PADCFG0_GPIORXDIS; + value |= PADCFG0_GPIOTXDIS; + + /* Disable SCI/SMI/NMI generation */ + value &= ~(PADCFG0_GPIROUTIOXAPIC | PADCFG0_GPIROUTSCI); + value &= ~(PADCFG0_GPIROUTSMI | PADCFG0_GPIROUTNMI); + + writel(value, padcfg0); +} + +static int intel_gpio_request_enable(struct pinctrl_dev *pctldev, + struct pinctrl_gpio_range *range, + unsigned int pin) +{ + struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); + void __iomem *padcfg0; + unsigned long flags; + + padcfg0 = intel_get_padcfg(pctrl, pin, PADCFG0); + + raw_spin_lock_irqsave(&pctrl->lock, flags); + + if (!intel_pad_owned_by_host(pctrl, pin)) { + raw_spin_unlock_irqrestore(&pctrl->lock, flags); + return -EBUSY; + } + + if (!intel_pad_is_unlocked(pctrl, pin)) { + raw_spin_unlock_irqrestore(&pctrl->lock, flags); + return 0; + } + + /* + * If pin is already configured in GPIO mode, we assume that + * firmware provides correct settings. In such case we avoid + * potential glitches on the pin. Otherwise, for the pin in + * alternative mode, consumer has to supply respective flags. + */ + if (intel_gpio_get_gpio_mode(padcfg0) == PADCFG0_PMODE_GPIO) { + raw_spin_unlock_irqrestore(&pctrl->lock, flags); + return 0; + } + + intel_gpio_set_gpio_mode(padcfg0); + + raw_spin_unlock_irqrestore(&pctrl->lock, flags); + + return 0; +} + +static int intel_gpio_set_direction(struct pinctrl_dev *pctldev, + struct pinctrl_gpio_range *range, + unsigned int pin, bool input) +{ + struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); + void __iomem *padcfg0; + unsigned long flags; + + padcfg0 = intel_get_padcfg(pctrl, pin, PADCFG0); + + raw_spin_lock_irqsave(&pctrl->lock, flags); + __intel_gpio_set_direction(padcfg0, input); + raw_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_pull(struct intel_pinctrl *pctrl, unsigned int pin, + enum pin_config_param param, u32 *arg) +{ + const struct intel_community *community; + void __iomem *padcfg1; + unsigned long flags; + u32 value, term; + + community = intel_get_community(pctrl, pin); + padcfg1 = intel_get_padcfg(pctrl, pin, PADCFG1); + + raw_spin_lock_irqsave(&pctrl->lock, flags); + value = readl(padcfg1); + raw_spin_unlock_irqrestore(&pctrl->lock, flags); + + 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_833: + *arg = 833; + break; + case PADCFG1_TERM_1K: + *arg = 1000; + 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_833: + if (!(community->features & PINCTRL_FEATURE_1K_PD)) + return -EINVAL; + *arg = 833; + break; + case PADCFG1_TERM_1K: + if (!(community->features & PINCTRL_FEATURE_1K_PD)) + return -EINVAL; + *arg = 1000; + break; + case PADCFG1_TERM_5K: + *arg = 5000; + break; + case PADCFG1_TERM_20K: + *arg = 20000; + break; + } + + break; + + default: + return -EINVAL; + } + + return 0; +} + +static int intel_config_get_debounce(struct intel_pinctrl *pctrl, unsigned int pin, + enum pin_config_param param, u32 *arg) +{ + void __iomem *padcfg2; + unsigned long flags; + unsigned long v; + u32 value2; + + padcfg2 = intel_get_padcfg(pctrl, pin, PADCFG2); + if (!padcfg2) + return -ENOTSUPP; + + raw_spin_lock_irqsave(&pctrl->lock, flags); + value2 = readl(padcfg2); + raw_spin_unlock_irqrestore(&pctrl->lock, flags); + if (!(value2 & PADCFG2_DEBEN)) + return -EINVAL; + + v = (value2 & PADCFG2_DEBOUNCE_MASK) >> PADCFG2_DEBOUNCE_SHIFT; + *arg = BIT(v) * DEBOUNCE_PERIOD_NSEC / NSEC_PER_USEC; + + return 0; +} + +static int intel_config_get(struct pinctrl_dev *pctldev, unsigned int pin, + unsigned long *config) +{ + struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); + enum pin_config_param param = pinconf_to_config_param(*config); + u32 arg = 0; + int ret; + + if (!intel_pad_owned_by_host(pctrl, pin)) + return -ENOTSUPP; + + switch (param) { + case PIN_CONFIG_BIAS_DISABLE: + case PIN_CONFIG_BIAS_PULL_UP: + case PIN_CONFIG_BIAS_PULL_DOWN: + ret = intel_config_get_pull(pctrl, pin, param, &arg); + if (ret) + return ret; + break; + + case PIN_CONFIG_INPUT_DEBOUNCE: + ret = intel_config_get_debounce(pctrl, pin, param, &arg); + if (ret) + return ret; + break; + + default: + return -ENOTSUPP; + } + + *config = pinconf_to_config_packed(param, arg); + return 0; +} + +static int intel_config_set_pull(struct intel_pinctrl *pctrl, unsigned int pin, + unsigned long config) +{ + unsigned int param = pinconf_to_config_param(config); + unsigned int arg = pinconf_to_config_argument(config); + const struct intel_community *community; + void __iomem *padcfg1; + unsigned long flags; + int ret = 0; + u32 value; + + community = intel_get_community(pctrl, pin); + padcfg1 = intel_get_padcfg(pctrl, pin, PADCFG1); + + raw_spin_lock_irqsave(&pctrl->lock, flags); + + 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; + + /* Set default strength value in case none is given */ + if (arg == 1) + arg = 5000; + + switch (arg) { + case 20000: + value |= PADCFG1_TERM_20K << PADCFG1_TERM_SHIFT; + break; + case 5000: + value |= PADCFG1_TERM_5K << PADCFG1_TERM_SHIFT; + break; + case 1000: + value |= PADCFG1_TERM_1K << PADCFG1_TERM_SHIFT; + break; + case 833: + value |= PADCFG1_TERM_833 << PADCFG1_TERM_SHIFT; + break; + default: + ret = -EINVAL; + } + + break; + + case PIN_CONFIG_BIAS_PULL_DOWN: + value &= ~(PADCFG1_TERM_UP | PADCFG1_TERM_MASK); + + /* Set default strength value in case none is given */ + if (arg == 1) + arg = 5000; + + switch (arg) { + case 20000: + value |= PADCFG1_TERM_20K << PADCFG1_TERM_SHIFT; + break; + case 5000: + value |= PADCFG1_TERM_5K << PADCFG1_TERM_SHIFT; + break; + case 1000: + if (!(community->features & PINCTRL_FEATURE_1K_PD)) { + ret = -EINVAL; + break; + } + value |= PADCFG1_TERM_1K << PADCFG1_TERM_SHIFT; + break; + case 833: + if (!(community->features & PINCTRL_FEATURE_1K_PD)) { + ret = -EINVAL; + break; + } + value |= PADCFG1_TERM_833 << PADCFG1_TERM_SHIFT; + break; + default: + ret = -EINVAL; + } + + break; + } + + if (!ret) + writel(value, padcfg1); + + raw_spin_unlock_irqrestore(&pctrl->lock, flags); + + return ret; +} + +static int intel_config_set_debounce(struct intel_pinctrl *pctrl, + unsigned int pin, unsigned int debounce) +{ + void __iomem *padcfg0, *padcfg2; + unsigned long flags; + u32 value0, value2; + + padcfg2 = intel_get_padcfg(pctrl, pin, PADCFG2); + if (!padcfg2) + return -ENOTSUPP; + + padcfg0 = intel_get_padcfg(pctrl, pin, PADCFG0); + + raw_spin_lock_irqsave(&pctrl->lock, flags); + + value0 = readl(padcfg0); + value2 = readl(padcfg2); + + /* Disable glitch filter and debouncer */ + value0 &= ~PADCFG0_PREGFRXSEL; + value2 &= ~(PADCFG2_DEBEN | PADCFG2_DEBOUNCE_MASK); + + if (debounce) { + unsigned long v; + + v = order_base_2(debounce * NSEC_PER_USEC / DEBOUNCE_PERIOD_NSEC); + if (v < 3 || v > 15) { + raw_spin_unlock_irqrestore(&pctrl->lock, flags); + return -EINVAL; + } + + /* Enable glitch filter and debouncer */ + value0 |= PADCFG0_PREGFRXSEL; + value2 |= v << PADCFG2_DEBOUNCE_SHIFT; + value2 |= PADCFG2_DEBEN; + } + + writel(value0, padcfg0); + writel(value2, padcfg2); + + raw_spin_unlock_irqrestore(&pctrl->lock, flags); + + return 0; +} + +static int intel_config_set(struct pinctrl_dev *pctldev, unsigned int pin, + unsigned long *configs, unsigned int 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; + + case PIN_CONFIG_INPUT_DEBOUNCE: + ret = intel_config_set_debounce(pctrl, pin, + pinconf_to_config_argument(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, +}; + +/** + * intel_gpio_to_pin() - Translate from GPIO offset to pin number + * @pctrl: Pinctrl structure + * @offset: GPIO offset from gpiolib + * @community: Community is filled here if not %NULL + * @padgrp: Pad group is filled here if not %NULL + * + * When coming through gpiolib irqchip, the GPIO offset is not + * automatically translated to pinctrl pin number. This function can be + * used to find out the corresponding pinctrl pin. + * + * Return: a pin number and pointers to the community and pad group, which + * the pin belongs to, or negative error code if translation can't be done. + */ +static int intel_gpio_to_pin(struct intel_pinctrl *pctrl, unsigned int offset, + const struct intel_community **community, + const struct intel_padgroup **padgrp) +{ + int i; + + for (i = 0; i < pctrl->ncommunities; i++) { + const struct intel_community *comm = &pctrl->communities[i]; + int j; + + for (j = 0; j < comm->ngpps; j++) { + const struct intel_padgroup *pgrp = &comm->gpps[j]; + + if (pgrp->gpio_base == INTEL_GPIO_BASE_NOMAP) + continue; + + if (offset >= pgrp->gpio_base && + offset < pgrp->gpio_base + pgrp->size) { + int pin; + + pin = pgrp->base + offset - pgrp->gpio_base; + if (community) + *community = comm; + if (padgrp) + *padgrp = pgrp; + + return pin; + } + } + } + + return -EINVAL; +} + +/** + * intel_pin_to_gpio() - Translate from pin number to GPIO offset + * @pctrl: Pinctrl structure + * @pin: pin number + * + * Translate the pin number of pinctrl to GPIO offset + * + * Return: a GPIO offset, or negative error code if translation can't be done. + */ +static __maybe_unused int intel_pin_to_gpio(struct intel_pinctrl *pctrl, int pin) +{ + const struct intel_community *community; + const struct intel_padgroup *padgrp; + + community = intel_get_community(pctrl, pin); + if (!community) + return -EINVAL; + + padgrp = intel_community_get_padgroup(community, pin); + if (!padgrp) + return -EINVAL; + + return pin - padgrp->base + padgrp->gpio_base; +} + +static int intel_gpio_get(struct gpio_chip *chip, unsigned int offset) +{ + struct intel_pinctrl *pctrl = gpiochip_get_data(chip); + void __iomem *reg; + u32 padcfg0; + int pin; + + pin = intel_gpio_to_pin(pctrl, offset, NULL, NULL); + if (pin < 0) + return -EINVAL; + + reg = intel_get_padcfg(pctrl, pin, PADCFG0); + if (!reg) + return -EINVAL; + + padcfg0 = readl(reg); + if (!(padcfg0 & PADCFG0_GPIOTXDIS)) + return !!(padcfg0 & PADCFG0_GPIOTXSTATE); + + return !!(padcfg0 & PADCFG0_GPIORXSTATE); +} + +static void intel_gpio_set(struct gpio_chip *chip, unsigned int offset, + int value) +{ + struct intel_pinctrl *pctrl = gpiochip_get_data(chip); + unsigned long flags; + void __iomem *reg; + u32 padcfg0; + int pin; + + pin = intel_gpio_to_pin(pctrl, offset, NULL, NULL); + if (pin < 0) + return; + + reg = intel_get_padcfg(pctrl, pin, PADCFG0); + if (!reg) + return; + + raw_spin_lock_irqsave(&pctrl->lock, flags); + padcfg0 = readl(reg); + if (value) + padcfg0 |= PADCFG0_GPIOTXSTATE; + else + padcfg0 &= ~PADCFG0_GPIOTXSTATE; + writel(padcfg0, reg); + raw_spin_unlock_irqrestore(&pctrl->lock, flags); +} + +static int intel_gpio_get_direction(struct gpio_chip *chip, unsigned int offset) +{ + struct intel_pinctrl *pctrl = gpiochip_get_data(chip); + unsigned long flags; + void __iomem *reg; + u32 padcfg0; + int pin; + + pin = intel_gpio_to_pin(pctrl, offset, NULL, NULL); + if (pin < 0) + return -EINVAL; + + reg = intel_get_padcfg(pctrl, pin, PADCFG0); + if (!reg) + return -EINVAL; + + raw_spin_lock_irqsave(&pctrl->lock, flags); + padcfg0 = readl(reg); + raw_spin_unlock_irqrestore(&pctrl->lock, flags); + if (padcfg0 & PADCFG0_PMODE_MASK) + return -EINVAL; + + if (padcfg0 & PADCFG0_GPIOTXDIS) + return GPIO_LINE_DIRECTION_IN; + + return GPIO_LINE_DIRECTION_OUT; +} + +static int intel_gpio_direction_input(struct gpio_chip *chip, unsigned int offset) +{ + return pinctrl_gpio_direction_input(chip->base + offset); +} + +static int intel_gpio_direction_output(struct gpio_chip *chip, unsigned int 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 = gpiochip_generic_request, + .free = gpiochip_generic_free, + .get_direction = intel_gpio_get_direction, + .direction_input = intel_gpio_direction_input, + .direction_output = intel_gpio_direction_output, + .get = intel_gpio_get, + .set = intel_gpio_set, + .set_config = gpiochip_generic_config, +}; + +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_get_data(gc); + const struct intel_community *community; + const struct intel_padgroup *padgrp; + int pin; + + pin = intel_gpio_to_pin(pctrl, irqd_to_hwirq(d), &community, &padgrp); + if (pin >= 0) { + unsigned int gpp, gpp_offset, is_offset; + + gpp = padgrp->reg_num; + gpp_offset = padgroup_offset(padgrp, pin); + is_offset = community->is_offset + gpp * 4; + + raw_spin_lock(&pctrl->lock); + writel(BIT(gpp_offset), community->regs + is_offset); + raw_spin_unlock(&pctrl->lock); + } +} + +static void intel_gpio_irq_mask_unmask(struct gpio_chip *gc, irq_hw_number_t hwirq, bool mask) +{ + struct intel_pinctrl *pctrl = gpiochip_get_data(gc); + const struct intel_community *community; + const struct intel_padgroup *padgrp; + int pin; + + pin = intel_gpio_to_pin(pctrl, hwirq, &community, &padgrp); + if (pin >= 0) { + unsigned int gpp, gpp_offset; + unsigned long flags; + void __iomem *reg, *is; + u32 value; + + gpp = padgrp->reg_num; + gpp_offset = padgroup_offset(padgrp, pin); + + reg = community->regs + community->ie_offset + gpp * 4; + is = community->regs + community->is_offset + gpp * 4; + + raw_spin_lock_irqsave(&pctrl->lock, flags); + + /* Clear interrupt status first to avoid unexpected interrupt */ + writel(BIT(gpp_offset), is); + + value = readl(reg); + if (mask) + value &= ~BIT(gpp_offset); + else + value |= BIT(gpp_offset); + writel(value, reg); + raw_spin_unlock_irqrestore(&pctrl->lock, flags); + } +} + +static void intel_gpio_irq_mask(struct irq_data *d) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + irq_hw_number_t hwirq = irqd_to_hwirq(d); + + intel_gpio_irq_mask_unmask(gc, hwirq, true); + gpiochip_disable_irq(gc, hwirq); +} + +static void intel_gpio_irq_unmask(struct irq_data *d) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + irq_hw_number_t hwirq = irqd_to_hwirq(d); + + gpiochip_enable_irq(gc, hwirq); + intel_gpio_irq_mask_unmask(gc, hwirq, false); +} + +static int intel_gpio_irq_type(struct irq_data *d, unsigned int type) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + struct intel_pinctrl *pctrl = gpiochip_get_data(gc); + unsigned int pin = intel_gpio_to_pin(pctrl, irqd_to_hwirq(d), NULL, NULL); + unsigned long flags; + void __iomem *reg; + u32 value; + + reg = intel_get_padcfg(pctrl, pin, PADCFG0); + if (!reg) + return -EINVAL; + + /* + * If the pin is in ACPI mode it is still usable as a GPIO but it + * cannot be used as IRQ because GPI_IS status bit will not be + * updated by the host controller hardware. + */ + if (intel_pad_acpi_mode(pctrl, pin)) { + dev_warn(pctrl->dev, "pin %u cannot be used as IRQ\n", pin); + return -EPERM; + } + + raw_spin_lock_irqsave(&pctrl->lock, flags); + + intel_gpio_set_gpio_mode(reg); + + 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_MASK) { + 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, handle_edge_irq); + else if (type & IRQ_TYPE_LEVEL_MASK) + irq_set_handler_locked(d, handle_level_irq); + + raw_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_get_data(gc); + unsigned int pin = intel_gpio_to_pin(pctrl, irqd_to_hwirq(d), NULL, NULL); + + if (on) + enable_irq_wake(pctrl->irq); + else + disable_irq_wake(pctrl->irq); + + dev_dbg(pctrl->dev, "%sable wake for pin %u\n", on ? "en" : "dis", pin); + return 0; +} + +static const struct irq_chip intel_gpio_irq_chip = { + .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, + .flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_IMMUTABLE, + GPIOCHIP_IRQ_RESOURCE_HELPERS, +}; + +static int intel_gpio_community_irq_handler(struct intel_pinctrl *pctrl, + const struct intel_community *community) +{ + struct gpio_chip *gc = &pctrl->chip; + unsigned int gpp; + int ret = 0; + + for (gpp = 0; gpp < community->ngpps; gpp++) { + const struct intel_padgroup *padgrp = &community->gpps[gpp]; + unsigned long pending, enabled, gpp_offset; + + raw_spin_lock(&pctrl->lock); + + pending = readl(community->regs + community->is_offset + + padgrp->reg_num * 4); + enabled = readl(community->regs + community->ie_offset + + padgrp->reg_num * 4); + + raw_spin_unlock(&pctrl->lock); + + /* Only interrupts that are enabled */ + pending &= enabled; + + for_each_set_bit(gpp_offset, &pending, padgrp->size) { + unsigned int irq; + + irq = irq_find_mapping(gc->irq.domain, + padgrp->gpio_base + gpp_offset); + generic_handle_irq(irq); + } + + ret += pending ? 1 : 0; + } + + return ret; +} + +static irqreturn_t intel_gpio_irq(int irq, void *data) +{ + const struct intel_community *community; + struct intel_pinctrl *pctrl = data; + unsigned int i; + int ret = 0; + + /* Need to check all communities for pending interrupts */ + for (i = 0; i < pctrl->ncommunities; i++) { + community = &pctrl->communities[i]; + ret += intel_gpio_community_irq_handler(pctrl, community); + } + + return IRQ_RETVAL(ret); +} + +static void intel_gpio_irq_init(struct intel_pinctrl *pctrl) +{ + int i; + + for (i = 0; i < pctrl->ncommunities; i++) { + const struct intel_community *community; + void __iomem *base; + unsigned int 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 + community->is_offset + gpp * 4); + } + } +} + +static int intel_gpio_irq_init_hw(struct gpio_chip *gc) +{ + struct intel_pinctrl *pctrl = gpiochip_get_data(gc); + + /* + * Make sure the interrupt lines are in a proper state before + * further configuration. + */ + intel_gpio_irq_init(pctrl); + + return 0; +} + +static int intel_gpio_add_community_ranges(struct intel_pinctrl *pctrl, + const struct intel_community *community) +{ + int ret = 0, i; + + for (i = 0; i < community->ngpps; i++) { + const struct intel_padgroup *gpp = &community->gpps[i]; + + if (gpp->gpio_base == INTEL_GPIO_BASE_NOMAP) + continue; + + ret = gpiochip_add_pin_range(&pctrl->chip, dev_name(pctrl->dev), + gpp->gpio_base, gpp->base, + gpp->size); + if (ret) + return ret; + } + + return ret; +} + +static int intel_gpio_add_pin_ranges(struct gpio_chip *gc) +{ + struct intel_pinctrl *pctrl = gpiochip_get_data(gc); + int ret, i; + + for (i = 0; i < pctrl->ncommunities; i++) { + struct intel_community *community = &pctrl->communities[i]; + + ret = intel_gpio_add_community_ranges(pctrl, community); + if (ret) { + dev_err(pctrl->dev, "failed to add GPIO pin range\n"); + return ret; + } + } + + return 0; +} + +static unsigned int intel_gpio_ngpio(const struct intel_pinctrl *pctrl) +{ + const struct intel_community *community; + unsigned int ngpio = 0; + int i, j; + + for (i = 0; i < pctrl->ncommunities; i++) { + community = &pctrl->communities[i]; + for (j = 0; j < community->ngpps; j++) { + const struct intel_padgroup *gpp = &community->gpps[j]; + + if (gpp->gpio_base == INTEL_GPIO_BASE_NOMAP) + continue; + + if (gpp->gpio_base + gpp->size > ngpio) + ngpio = gpp->gpio_base + gpp->size; + } + } + + return ngpio; +} + +static int intel_gpio_probe(struct intel_pinctrl *pctrl, int irq) +{ + int ret; + struct gpio_irq_chip *girq; + + pctrl->chip = intel_gpio_chip; + + /* Setup GPIO chip */ + pctrl->chip.ngpio = intel_gpio_ngpio(pctrl); + pctrl->chip.label = dev_name(pctrl->dev); + pctrl->chip.parent = pctrl->dev; + pctrl->chip.base = -1; + pctrl->chip.add_pin_ranges = intel_gpio_add_pin_ranges; + pctrl->irq = irq; + + /* + * On some platforms several GPIO controllers share the same interrupt + * line. + */ + ret = devm_request_irq(pctrl->dev, irq, intel_gpio_irq, + IRQF_SHARED | IRQF_NO_THREAD, + dev_name(pctrl->dev), pctrl); + if (ret) { + dev_err(pctrl->dev, "failed to request interrupt\n"); + return ret; + } + + /* Setup IRQ chip */ + girq = &pctrl->chip.irq; + gpio_irq_chip_set_chip(girq, &intel_gpio_irq_chip); + /* This will let us handle the IRQ in the driver */ + girq->parent_handler = NULL; + girq->num_parents = 0; + girq->default_type = IRQ_TYPE_NONE; + girq->handler = handle_bad_irq; + girq->init_hw = intel_gpio_irq_init_hw; + + ret = devm_gpiochip_add_data(pctrl->dev, &pctrl->chip, pctrl); + if (ret) { + dev_err(pctrl->dev, "failed to register gpiochip\n"); + return ret; + } + + return 0; +} + +static int intel_pinctrl_add_padgroups_by_gpps(struct intel_pinctrl *pctrl, + struct intel_community *community) +{ + struct intel_padgroup *gpps; + unsigned int padown_num = 0; + size_t i, ngpps = community->ngpps; + + gpps = devm_kcalloc(pctrl->dev, ngpps, sizeof(*gpps), GFP_KERNEL); + if (!gpps) + return -ENOMEM; + + for (i = 0; i < ngpps; i++) { + gpps[i] = community->gpps[i]; + + if (gpps[i].size > 32) + return -EINVAL; + + /* Special treatment for GPIO base */ + switch (gpps[i].gpio_base) { + case INTEL_GPIO_BASE_MATCH: + gpps[i].gpio_base = gpps[i].base; + break; + case INTEL_GPIO_BASE_ZERO: + gpps[i].gpio_base = 0; + break; + case INTEL_GPIO_BASE_NOMAP: + break; + default: + break; + } + + gpps[i].padown_num = padown_num; + padown_num += DIV_ROUND_UP(gpps[i].size * 4, 32); + } + + community->gpps = gpps; + + return 0; +} + +static int intel_pinctrl_add_padgroups_by_size(struct intel_pinctrl *pctrl, + struct intel_community *community) +{ + struct intel_padgroup *gpps; + unsigned int npins = community->npins; + unsigned int padown_num = 0; + size_t i, ngpps = DIV_ROUND_UP(npins, community->gpp_size); + + if (community->gpp_size > 32) + return -EINVAL; + + gpps = devm_kcalloc(pctrl->dev, ngpps, sizeof(*gpps), GFP_KERNEL); + if (!gpps) + return -ENOMEM; + + for (i = 0; i < ngpps; i++) { + unsigned int gpp_size = community->gpp_size; + + gpps[i].reg_num = i; + gpps[i].base = community->pin_base + i * gpp_size; + gpps[i].size = min(gpp_size, npins); + npins -= gpps[i].size; + + gpps[i].gpio_base = gpps[i].base; + gpps[i].padown_num = padown_num; + + /* + * In older hardware the number of padown registers per + * group is fixed regardless of the group size. + */ + if (community->gpp_num_padown_regs) + padown_num += community->gpp_num_padown_regs; + else + padown_num += DIV_ROUND_UP(gpps[i].size * 4, 32); + } + + community->ngpps = ngpps; + community->gpps = gpps; + + 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, *hostown; + + intmask = devm_kcalloc(pctrl->dev, community->ngpps, + sizeof(*intmask), GFP_KERNEL); + if (!intmask) + return -ENOMEM; + + communities[i].intmask = intmask; + + hostown = devm_kcalloc(pctrl->dev, community->ngpps, + sizeof(*hostown), GFP_KERNEL); + if (!hostown) + return -ENOMEM; + + communities[i].hostown = hostown; + } + + pctrl->context.pads = pads; + pctrl->context.communities = communities; +#endif + + return 0; +} + +static int intel_pinctrl_probe(struct platform_device *pdev, + const struct intel_pinctrl_soc_data *soc_data) +{ + struct intel_pinctrl *pctrl; + int i, ret, irq; + + pctrl = devm_kzalloc(&pdev->dev, sizeof(*pctrl), GFP_KERNEL); + if (!pctrl) + return -ENOMEM; + + pctrl->dev = &pdev->dev; + pctrl->soc = soc_data; + raw_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]; + void __iomem *regs; + u32 offset; + u32 value; + + *community = pctrl->soc->communities[i]; + + regs = devm_platform_ioremap_resource(pdev, community->barno); + if (IS_ERR(regs)) + return PTR_ERR(regs); + + /* + * Determine community features based on the revision. + * A value of all ones means the device is not present. + */ + value = readl(regs + REVID); + if (value == ~0u) + return -ENODEV; + if (((value & REVID_MASK) >> REVID_SHIFT) >= 0x94) { + community->features |= PINCTRL_FEATURE_DEBOUNCE; + community->features |= PINCTRL_FEATURE_1K_PD; + } + + /* Determine community features based on the capabilities */ + offset = CAPLIST; + do { + value = readl(regs + offset); + switch ((value & CAPLIST_ID_MASK) >> CAPLIST_ID_SHIFT) { + case CAPLIST_ID_GPIO_HW_INFO: + community->features |= PINCTRL_FEATURE_GPIO_HW_INFO; + break; + case CAPLIST_ID_PWM: + community->features |= PINCTRL_FEATURE_PWM; + break; + case CAPLIST_ID_BLINK: + community->features |= PINCTRL_FEATURE_BLINK; + break; + case CAPLIST_ID_EXP: + community->features |= PINCTRL_FEATURE_EXP; + break; + default: + break; + } + offset = (value & CAPLIST_NEXT_MASK) >> CAPLIST_NEXT_SHIFT; + } while (offset); + + dev_dbg(&pdev->dev, "Community%d features: %#08x\n", i, community->features); + + /* Read offset of the pad configuration registers */ + offset = readl(regs + PADBAR); + + community->regs = regs; + community->pad_regs = regs + offset; + + if (community->gpps) + ret = intel_pinctrl_add_padgroups_by_gpps(pctrl, community); + else + ret = intel_pinctrl_add_padgroups_by_size(pctrl, community); + if (ret) + return ret; + } + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + 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 = devm_pinctrl_register(&pdev->dev, &pctrl->pctldesc, + pctrl); + if (IS_ERR(pctrl->pctldev)) { + dev_err(&pdev->dev, "failed to register pinctrl driver\n"); + return PTR_ERR(pctrl->pctldev); + } + + ret = intel_gpio_probe(pctrl, irq); + if (ret) + return ret; + + platform_set_drvdata(pdev, pctrl); + + return 0; +} + +int intel_pinctrl_probe_by_hid(struct platform_device *pdev) +{ + const struct intel_pinctrl_soc_data *data; + + data = device_get_match_data(&pdev->dev); + if (!data) + return -ENODATA; + + return intel_pinctrl_probe(pdev, data); +} +EXPORT_SYMBOL_GPL(intel_pinctrl_probe_by_hid); + +int intel_pinctrl_probe_by_uid(struct platform_device *pdev) +{ + const struct intel_pinctrl_soc_data *data; + + data = intel_pinctrl_get_soc_data(pdev); + if (IS_ERR(data)) + return PTR_ERR(data); + + return intel_pinctrl_probe(pdev, data); +} +EXPORT_SYMBOL_GPL(intel_pinctrl_probe_by_uid); + +const struct intel_pinctrl_soc_data *intel_pinctrl_get_soc_data(struct platform_device *pdev) +{ + const struct intel_pinctrl_soc_data * const *table; + const struct intel_pinctrl_soc_data *data = NULL; + + table = device_get_match_data(&pdev->dev); + if (table) { + struct acpi_device *adev = ACPI_COMPANION(&pdev->dev); + unsigned int i; + + for (i = 0; table[i]; i++) { + if (!strcmp(adev->pnp.unique_id, table[i]->uid)) { + data = table[i]; + break; + } + } + } else { + const struct platform_device_id *id; + + id = platform_get_device_id(pdev); + if (!id) + return ERR_PTR(-ENODEV); + + table = (const struct intel_pinctrl_soc_data * const *)id->driver_data; + data = table[pdev->id]; + } + + return data ?: ERR_PTR(-ENODATA); +} +EXPORT_SYMBOL_GPL(intel_pinctrl_get_soc_data); + +#ifdef CONFIG_PM_SLEEP +static bool __intel_gpio_is_direct_irq(u32 value) +{ + return (value & PADCFG0_GPIROUTIOXAPIC) && (value & PADCFG0_GPIOTXDIS) && + (__intel_gpio_get_gpio_mode(value) == PADCFG0_PMODE_GPIO); +} + +static bool intel_pinctrl_should_save(struct intel_pinctrl *pctrl, unsigned int pin) +{ + const struct pin_desc *pd = pin_desc_get(pctrl->pctldev, pin); + u32 value; + + if (!pd || !intel_pad_usable(pctrl, pin)) + return false; + + /* + * Only restore the pin if it is actually in use by the kernel (or + * by userspace). It is possible that some pins are used by the + * BIOS during resume and those are not always locked down so leave + * them alone. + */ + if (pd->mux_owner || pd->gpio_owner || + gpiochip_line_is_irq(&pctrl->chip, intel_pin_to_gpio(pctrl, pin))) + return true; + + /* + * The firmware on some systems may configure GPIO pins to be + * an interrupt source in so called "direct IRQ" mode. In such + * cases the GPIO controller driver has no idea if those pins + * are being used or not. At the same time, there is a known bug + * in the firmwares that don't restore the pin settings correctly + * after suspend, i.e. by an unknown reason the Rx value becomes + * inverted. + * + * Hence, let's save and restore the pins that are configured + * as GPIOs in the input mode with GPIROUTIOXAPIC bit set. + * + * See https://bugzilla.kernel.org/show_bug.cgi?id=214749. + */ + value = readl(intel_get_padcfg(pctrl, pin, PADCFG0)); + if (__intel_gpio_is_direct_irq(value)) + return true; + + return false; +} + +int intel_pinctrl_suspend_noirq(struct device *dev) +{ + struct intel_pinctrl *pctrl = dev_get_drvdata(dev); + 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]; + void __iomem *padcfg; + u32 val; + + if (!intel_pinctrl_should_save(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; + + padcfg = intel_get_padcfg(pctrl, desc->number, PADCFG2); + if (padcfg) + pads[i].padcfg2 = readl(padcfg); + } + + communities = pctrl->context.communities; + for (i = 0; i < pctrl->ncommunities; i++) { + struct intel_community *community = &pctrl->communities[i]; + void __iomem *base; + unsigned int gpp; + + base = community->regs + community->ie_offset; + for (gpp = 0; gpp < community->ngpps; gpp++) + communities[i].intmask[gpp] = readl(base + gpp * 4); + + base = community->regs + community->hostown_offset; + for (gpp = 0; gpp < community->ngpps; gpp++) + communities[i].hostown[gpp] = readl(base + gpp * 4); + } + + return 0; +} +EXPORT_SYMBOL_GPL(intel_pinctrl_suspend_noirq); + +static bool intel_gpio_update_reg(void __iomem *reg, u32 mask, u32 value) +{ + u32 curr, updated; + + curr = readl(reg); + + updated = (curr & ~mask) | (value & mask); + if (curr == updated) + return false; + + writel(updated, reg); + return true; +} + +static void intel_restore_hostown(struct intel_pinctrl *pctrl, unsigned int c, + void __iomem *base, unsigned int gpp, u32 saved) +{ + const struct intel_community *community = &pctrl->communities[c]; + const struct intel_padgroup *padgrp = &community->gpps[gpp]; + struct device *dev = pctrl->dev; + const char *dummy; + u32 requested = 0; + unsigned int i; + + if (padgrp->gpio_base == INTEL_GPIO_BASE_NOMAP) + return; + + for_each_requested_gpio_in_range(&pctrl->chip, i, padgrp->gpio_base, padgrp->size, dummy) + requested |= BIT(i); + + if (!intel_gpio_update_reg(base + gpp * 4, requested, saved)) + return; + + dev_dbg(dev, "restored hostown %u/%u %#08x\n", c, gpp, readl(base + gpp * 4)); +} + +static void intel_restore_intmask(struct intel_pinctrl *pctrl, unsigned int c, + void __iomem *base, unsigned int gpp, u32 saved) +{ + struct device *dev = pctrl->dev; + + if (!intel_gpio_update_reg(base + gpp * 4, ~0U, saved)) + return; + + dev_dbg(dev, "restored mask %u/%u %#08x\n", c, gpp, readl(base + gpp * 4)); +} + +static void intel_restore_padcfg(struct intel_pinctrl *pctrl, unsigned int pin, + unsigned int reg, u32 saved) +{ + u32 mask = (reg == PADCFG0) ? PADCFG0_GPIORXSTATE : 0; + unsigned int n = reg / sizeof(u32); + struct device *dev = pctrl->dev; + void __iomem *padcfg; + + padcfg = intel_get_padcfg(pctrl, pin, reg); + if (!padcfg) + return; + + if (!intel_gpio_update_reg(padcfg, ~mask, saved)) + return; + + dev_dbg(dev, "restored pin %u padcfg%u %#08x\n", pin, n, readl(padcfg)); +} + +int intel_pinctrl_resume_noirq(struct device *dev) +{ + struct intel_pinctrl *pctrl = dev_get_drvdata(dev); + 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]; + + if (!(intel_pinctrl_should_save(pctrl, desc->number) || + /* + * If the firmware mangled the register contents too much, + * check the saved value for the Direct IRQ mode. + */ + __intel_gpio_is_direct_irq(pads[i].padcfg0))) + continue; + + intel_restore_padcfg(pctrl, desc->number, PADCFG0, pads[i].padcfg0); + intel_restore_padcfg(pctrl, desc->number, PADCFG1, pads[i].padcfg1); + intel_restore_padcfg(pctrl, desc->number, PADCFG2, pads[i].padcfg2); + } + + communities = pctrl->context.communities; + for (i = 0; i < pctrl->ncommunities; i++) { + struct intel_community *community = &pctrl->communities[i]; + void __iomem *base; + unsigned int gpp; + + base = community->regs + community->ie_offset; + for (gpp = 0; gpp < community->ngpps; gpp++) + intel_restore_intmask(pctrl, i, base, gpp, communities[i].intmask[gpp]); + + base = community->regs + community->hostown_offset; + for (gpp = 0; gpp < community->ngpps; gpp++) + intel_restore_hostown(pctrl, i, base, gpp, communities[i].hostown[gpp]); + } + + return 0; +} +EXPORT_SYMBOL_GPL(intel_pinctrl_resume_noirq); +#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"); |