--- /dev/null
+/*
+ * 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");
Code Review / kvmfornfv.git / blobdiff