| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Mika Westerberg | 6820 | 90.40% | 16 | 36.36% |
| Andy Shevchenko | 475 | 6.30% | 13 | 29.55% |
| Qi Zheng | 122 | 1.62% | 1 | 2.27% |
| Javier Arteaga | 50 | 0.66% | 1 | 2.27% |
| Qipeng Zha | 23 | 0.30% | 3 | 6.82% |
| Nilesh Bacchewar | 15 | 0.20% | 1 | 2.27% |
| Masahiro Yamada | 9 | 0.12% | 1 | 2.27% |
| Linus Walleij | 9 | 0.12% | 2 | 4.55% |
| Dan Carpenter | 6 | 0.08% | 1 | 2.27% |
| Laxman Dewangan | 5 | 0.07% | 1 | 2.27% |
| Wolfram Sang | 4 | 0.05% | 1 | 2.27% |
| Jonas Gorski | 2 | 0.03% | 1 | 2.27% |
| Colin Ian King | 2 | 0.03% | 1 | 2.27% |
| Thomas Gleixner | 2 | 0.03% | 1 | 2.27% |
| Total | 7544 | 44 |
// 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/module.h> #include <linux/interrupt.h> #include <linux/gpio/driver.h> #include <linux/log2.h> #include <linux/platform_device.h> #include <linux/property.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 PADBAR 0x00c #define GPI_IS 0x100 #define PADOWN_BITS 4 #define PADOWN_SHIFT(p) ((p) % 8 * PADOWN_BITS) #define PADOWN_MASK(p) (0xf << 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 (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_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 (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 #define PADCFG2 0x008 #define PADCFG2_DEBEN BIT(0) #define PADCFG2_DEBOUNCE_SHIFT 1 #define PADCFG2_DEBOUNCE_MASK GENMASK(4, 1) #define DEBOUNCE_PERIOD 31250 /* ns */ struct intel_pad_context { u32 padcfg0; u32 padcfg1; u32 padcfg2; }; 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 * @irq: pinctrl/GPIO chip irq number */ struct intel_pinctrl { struct device *dev; raw_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; int irq; }; #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 == PADCFG2 && !(community->features & PINCTRL_FEATURE_DEBOUNCE)) 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)); } static bool 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; community = intel_get_community(pctrl, pin); if (!community) return true; if (!community->padcfglock_offset) return false; padgrp = intel_community_get_padgroup(community, pin); if (!padgrp) return true; 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 and we don't touch it. */ offset = community->padcfglock_offset + padgrp->reg_num * 8; value = readl(community->regs + offset); if (value & BIT(gpp_offset)) return true; offset = community->padcfglock_offset + 4 + padgrp->reg_num * 8; value = readl(community->regs + offset); if (value & BIT(gpp_offset)) return true; return false; } static bool intel_pad_usable(struct intel_pinctrl *pctrl, unsigned int pin) { return intel_pad_owned_by_host(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 int 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 int group, const unsigned int **pins, unsigned int *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 int pin) { struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); void __iomem *padcfg; 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); /* 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 (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->npins; i++) { if (!intel_pad_usable(pctrl, 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->npins; i++) { void __iomem *padcfg0; u32 value; padcfg0 = intel_get_padcfg(pctrl, 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 void intel_gpio_set_gpio_mode(void __iomem *padcfg0) { u32 value; /* 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); 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; raw_spin_lock_irqsave(&pctrl->lock, flags); if (!intel_pad_usable(pctrl, pin)) { raw_spin_unlock_irqrestore(&pctrl->lock, flags); return -EBUSY; } padcfg0 = intel_get_padcfg(pctrl, pin, PADCFG0); intel_gpio_set_gpio_mode(padcfg0); /* Disable TX buffer and enable RX (this will be input) */ __intel_gpio_set_direction(padcfg0, true); 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; raw_spin_lock_irqsave(&pctrl->lock, flags); padcfg0 = intel_get_padcfg(pctrl, pin, PADCFG0); __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(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); const struct intel_community *community; u32 value, term; u32 arg = 0; if (!intel_pad_owned_by_host(pctrl, pin)) return -ENOTSUPP; community = intel_get_community(pctrl, pin); 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_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; case PIN_CONFIG_INPUT_DEBOUNCE: { void __iomem *padcfg2; u32 v; padcfg2 = intel_get_padcfg(pctrl, pin, PADCFG2); if (!padcfg2) return -ENOTSUPP; v = readl(padcfg2); if (!(v & PADCFG2_DEBEN)) return -EINVAL; v = (v & PADCFG2_DEBOUNCE_MASK) >> PADCFG2_DEBOUNCE_SHIFT; arg = BIT(v) * DEBOUNCE_PERIOD / 1000; 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; raw_spin_lock_irqsave(&pctrl->lock, flags); community = intel_get_community(pctrl, pin); 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; case 1000: if (!(community->features & PINCTRL_FEATURE_1K_PD)) { ret = -EINVAL; break; } value |= PADCFG1_TERM_1K << 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; int ret = 0; 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 * 1000 / DEBOUNCE_PERIOD); if (v < 3 || v > 15) { ret = -EINVAL; goto exit_unlock; } else { /* Enable glitch filter and debouncer */ value0 |= PADCFG0_PREGFRXSEL; value2 |= v << PADCFG2_DEBOUNCE_SHIFT; value2 |= PADCFG2_DEBEN; } } writel(value0, padcfg0); writel(value2, padcfg2); exit_unlock: raw_spin_unlock_irqrestore(&pctrl->lock, flags); return ret; } 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. */ 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 < 0) 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; } 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); 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_PMODE_MASK) return -EINVAL; return !!(padcfg0 & PADCFG0_GPIOTXDIS); } 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_enable(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; unsigned long flags; u32 value; gpp = padgrp->reg_num; gpp_offset = padgroup_offset(padgrp, pin); is_offset = community->is_offset + gpp * 4; raw_spin_lock_irqsave(&pctrl->lock, flags); /* Clear interrupt status first to avoid unexpected interrupt */ writel(BIT(gpp_offset), community->regs + is_offset); value = readl(community->regs + community->ie_offset + gpp * 4); value |= BIT(gpp_offset); writel(value, community->regs + community->ie_offset + gpp * 4); raw_spin_unlock_irqrestore(&pctrl->lock, flags); } } 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_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; unsigned long flags; void __iomem *reg; u32 value; gpp = padgrp->reg_num; gpp_offset = padgroup_offset(padgrp, pin); reg = community->regs + community->ie_offset + gpp * 4; raw_spin_lock_irqsave(&pctrl->lock, flags); 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) { 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 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 irqreturn_t intel_gpio_community_irq_handler(struct intel_pinctrl *pctrl, const struct intel_community *community) { struct gpio_chip *gc = &pctrl->chip; irqreturn_t ret = IRQ_NONE; int gpp; for (gpp = 0; gpp < community->ngpps; gpp++) { const struct intel_padgroup *padgrp = &community->gpps[gpp]; unsigned long pending, enabled, gpp_offset; pending = readl(community->regs + community->is_offset + padgrp->reg_num * 4); enabled = readl(community->regs + community->ie_offset + padgrp->reg_num * 4); /* Only interrupts that are enabled */ pending &= enabled; for_each_set_bit(gpp_offset, &pending, padgrp->size) { unsigned irq; irq = irq_find_mapping(gc->irq.domain, padgrp->gpio_base + gpp_offset); generic_handle_irq(irq); ret |= IRQ_HANDLED; } } return ret; } static irqreturn_t intel_gpio_irq(int irq, void *data) { const struct intel_community *community; struct intel_pinctrl *pctrl = data; irqreturn_t ret = IRQ_NONE; int i; /* 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 ret; } static struct irq_chip intel_gpio_irqchip = { .name = "intel-gpio", .irq_enable = intel_gpio_irq_enable, .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, }; static int intel_gpio_add_pin_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 < 0) 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 unsigned 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 < 0) 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, i; pctrl->chip = intel_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->irq = irq; ret = devm_gpiochip_add_data(pctrl->dev, &pctrl->chip, pctrl); if (ret) { dev_err(pctrl->dev, "failed to register gpiochip\n"); return ret; } for (i = 0; i < pctrl->ncommunities; i++) { struct intel_community *community = &pctrl->communities[i]; ret = intel_gpio_add_pin_ranges(pctrl, community); if (ret) { dev_err(pctrl->dev, "failed to add GPIO pin range\n"); return ret; } } /* * We need to request the interrupt here (instead of providing chip * to the irq directly) because 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; } ret = gpiochip_irqchip_add(&pctrl->chip, &intel_gpio_irqchip, 0, handle_bad_irq, IRQ_TYPE_NONE); if (ret) { dev_err(pctrl->dev, "failed to add irqchip\n"); return ret; } gpiochip_set_chained_irqchip(&pctrl->chip, &intel_gpio_irqchip, irq, NULL); return 0; } static int intel_pinctrl_add_padgroups(struct intel_pinctrl *pctrl, struct intel_community *community) { struct intel_padgroup *gpps; unsigned int npins = community->npins; unsigned int padown_num = 0; size_t ngpps, i; if (community->gpps) ngpps = community->ngpps; else ngpps = DIV_ROUND_UP(community->npins, community->gpp_size); gpps = devm_kcalloc(pctrl->dev, ngpps, sizeof(*gpps), GFP_KERNEL); if (!gpps) return -ENOMEM; for (i = 0; i < ngpps; i++) { if (community->gpps) { gpps[i] = community->gpps[i]; } else { 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; } if (gpps[i].size > 32) return -EINVAL; if (!gpps[i].gpio_base) 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; 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; } 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; 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; 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]; 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); /* * Determine community features based on the revision if * not specified already. */ if (!community->features) { u32 rev; rev = (readl(regs + REVID) & REVID_MASK) >> REVID_SHIFT; if (rev >= 0x94) { community->features |= PINCTRL_FEATURE_DEBOUNCE; community->features |= PINCTRL_FEATURE_1K_PD; } } /* Read offset of the pad configuration registers */ padbar = readl(regs + PADBAR); community->regs = regs; community->pad_regs = regs + padbar; if (!community->is_offset) community->is_offset = GPI_IS; ret = intel_pinctrl_add_padgroups(pctrl, community); if (ret) return ret; } 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 = 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); 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 = NULL; const struct intel_pinctrl_soc_data **table; struct acpi_device *adev; unsigned int i; adev = ACPI_COMPANION(&pdev->dev); if (adev) { const void *match = device_get_match_data(&pdev->dev); table = (const struct intel_pinctrl_soc_data **)match; 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 -ENODEV; table = (const struct intel_pinctrl_soc_data **)id->driver_data; data = table[pdev->id]; } if (!data) return -ENODEV; return intel_pinctrl_probe(pdev, data); } EXPORT_SYMBOL_GPL(intel_pinctrl_probe_by_uid); #ifdef CONFIG_PM_SLEEP static bool intel_pinctrl_should_save(struct intel_pinctrl *pctrl, unsigned int pin) { const struct pin_desc *pd = pin_desc_get(pctrl->pctldev, pin); 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, pin)) return true; return false; } int intel_pinctrl_suspend(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); } return 0; } EXPORT_SYMBOL_GPL(intel_pinctrl_suspend); 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 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); } } } int intel_pinctrl_resume(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]; void __iomem *padcfg; u32 val; if (!intel_pinctrl_should_save(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)); } padcfg = intel_get_padcfg(pctrl, desc->number, PADCFG2); if (padcfg) { val = readl(padcfg); if (val != pads[i].padcfg2) { writel(pads[i].padcfg2, padcfg); dev_dbg(dev, "restored pin %u padcfg2 %#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 int 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");
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