/* * Support functions for OMAP GPIO * * Copyright (C) 2003-2005 Nokia Corporation * Written by Juha Yrjölä * * Copyright (C) 2009 Texas Instruments * Added OMAP4 support - Santosh Shilimkar * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define OMAP4_GPIO_DEBOUNCINGTIME_MASK 0xFF #define OMAP_GPIO_QUIRK_IDLE_REMOVE_TRIGGER BIT(2) #define OMAP_GPIO_QUIRK_DEFERRED_WKUP_EN BIT(1) struct gpio_regs { u32 irqenable1; u32 irqenable2; u32 wake_en; u32 ctrl; u32 oe; u32 leveldetect0; u32 leveldetect1; u32 risingdetect; u32 fallingdetect; u32 dataout; u32 debounce; u32 debounce_en; }; struct gpio_bank; struct gpio_omap_funcs { void (*idle_enable_level_quirk)(struct gpio_bank *bank); void (*idle_disable_level_quirk)(struct gpio_bank *bank); }; struct gpio_bank { struct list_head node; void __iomem *base; int irq; u32 non_wakeup_gpios; u32 enabled_non_wakeup_gpios; struct gpio_regs context; struct gpio_omap_funcs funcs; u32 saved_datain; u32 level_mask; u32 toggle_mask; raw_spinlock_t lock; raw_spinlock_t wa_lock; struct gpio_chip chip; struct clk *dbck; struct notifier_block nb; unsigned int is_suspended:1; u32 mod_usage; u32 irq_usage; u32 dbck_enable_mask; bool dbck_enabled; bool is_mpuio; bool dbck_flag; bool loses_context; bool context_valid; int stride; u32 width; int context_loss_count; bool workaround_enabled; u32 quirks; void (*set_dataout)(struct gpio_bank *bank, unsigned gpio, int enable); void (*set_dataout_multiple)(struct gpio_bank *bank, unsigned long *mask, unsigned long *bits); int (*get_context_loss_count)(struct device *dev); struct omap_gpio_reg_offs *regs; }; #define GPIO_MOD_CTRL_BIT BIT(0) #define BANK_USED(bank) (bank->mod_usage || bank->irq_usage) #define LINE_USED(line, offset) (line & (BIT(offset))) static void omap_gpio_unmask_irq(struct irq_data *d); static inline struct gpio_bank *omap_irq_data_get_bank(struct irq_data *d) { struct gpio_chip *chip = irq_data_get_irq_chip_data(d); return gpiochip_get_data(chip); } static void omap_set_gpio_direction(struct gpio_bank *bank, int gpio, int is_input) { void __iomem *reg = bank->base; u32 l; reg += bank->regs->direction; l = readl_relaxed(reg); if (is_input) l |= BIT(gpio); else l &= ~(BIT(gpio)); writel_relaxed(l, reg); bank->context.oe = l; } /* set data out value using dedicate set/clear register */ static void omap_set_gpio_dataout_reg(struct gpio_bank *bank, unsigned offset, int enable) { void __iomem *reg = bank->base; u32 l = BIT(offset); if (enable) { reg += bank->regs->set_dataout; bank->context.dataout |= l; } else { reg += bank->regs->clr_dataout; bank->context.dataout &= ~l; } writel_relaxed(l, reg); } /* set data out value using mask register */ static void omap_set_gpio_dataout_mask(struct gpio_bank *bank, unsigned offset, int enable) { void __iomem *reg = bank->base + bank->regs->dataout; u32 gpio_bit = BIT(offset); u32 l; l = readl_relaxed(reg); if (enable) l |= gpio_bit; else l &= ~gpio_bit; writel_relaxed(l, reg); bank->context.dataout = l; } static int omap_get_gpio_datain(struct gpio_bank *bank, int offset) { void __iomem *reg = bank->base + bank->regs->datain; return (readl_relaxed(reg) & (BIT(offset))) != 0; } static int omap_get_gpio_dataout(struct gpio_bank *bank, int offset) { void __iomem *reg = bank->base + bank->regs->dataout; return (readl_relaxed(reg) & (BIT(offset))) != 0; } /* set multiple data out values using dedicate set/clear register */ static void omap_set_gpio_dataout_reg_multiple(struct gpio_bank *bank, unsigned long *mask, unsigned long *bits) { void __iomem *reg = bank->base; u32 l; l = *bits & *mask; writel_relaxed(l, reg + bank->regs->set_dataout); bank->context.dataout |= l; l = ~*bits & *mask; writel_relaxed(l, reg + bank->regs->clr_dataout); bank->context.dataout &= ~l; } /* set multiple data out values using mask register */ static void omap_set_gpio_dataout_mask_multiple(struct gpio_bank *bank, unsigned long *mask, unsigned long *bits) { void __iomem *reg = bank->base + bank->regs->dataout; u32 l = (readl_relaxed(reg) & ~*mask) | (*bits & *mask); writel_relaxed(l, reg); bank->context.dataout = l; } static unsigned long omap_get_gpio_datain_multiple(struct gpio_bank *bank, unsigned long *mask) { void __iomem *reg = bank->base + bank->regs->datain; return readl_relaxed(reg) & *mask; } static unsigned long omap_get_gpio_dataout_multiple(struct gpio_bank *bank, unsigned long *mask) { void __iomem *reg = bank->base + bank->regs->dataout; return readl_relaxed(reg) & *mask; } static inline void omap_gpio_rmw(void __iomem *base, u32 reg, u32 mask, bool set) { int l = readl_relaxed(base + reg); if (set) l |= mask; else l &= ~mask; writel_relaxed(l, base + reg); } static inline void omap_gpio_dbck_enable(struct gpio_bank *bank) { if (bank->dbck_enable_mask && !bank->dbck_enabled) { clk_enable(bank->dbck); bank->dbck_enabled = true; writel_relaxed(bank->dbck_enable_mask, bank->base + bank->regs->debounce_en); } } static inline void omap_gpio_dbck_disable(struct gpio_bank *bank) { if (bank->dbck_enable_mask && bank->dbck_enabled) { /* * Disable debounce before cutting it's clock. If debounce is * enabled but the clock is not, GPIO module seems to be unable * to detect events and generate interrupts at least on OMAP3. */ writel_relaxed(0, bank->base + bank->regs->debounce_en); clk_disable(bank->dbck); bank->dbck_enabled = false; } } /** * omap2_set_gpio_debounce - low level gpio debounce time * @bank: the gpio bank we're acting upon * @offset: the gpio number on this @bank * @debounce: debounce time to use * * OMAP's debounce time is in 31us steps * = (GPIO_DEBOUNCINGTIME[7:0].DEBOUNCETIME + 1) x 31 * so we need to convert and round up to the closest unit. * * Return: 0 on success, negative error otherwise. */ static int omap2_set_gpio_debounce(struct gpio_bank *bank, unsigned offset, unsigned debounce) { void __iomem *reg; u32 val; u32 l; bool enable = !!debounce; if (!bank->dbck_flag) return -ENOTSUPP; if (enable) { debounce = DIV_ROUND_UP(debounce, 31) - 1; if ((debounce & OMAP4_GPIO_DEBOUNCINGTIME_MASK) != debounce) return -EINVAL; } l = BIT(offset); clk_enable(bank->dbck); reg = bank->base + bank->regs->debounce; writel_relaxed(debounce, reg); reg = bank->base + bank->regs->debounce_en; val = readl_relaxed(reg); if (enable) val |= l; else val &= ~l; bank->dbck_enable_mask = val; writel_relaxed(val, reg); clk_disable(bank->dbck); /* * Enable debounce clock per module. * This call is mandatory because in omap_gpio_request() when * *_runtime_get_sync() is called, _gpio_dbck_enable() within * runtime callbck fails to turn on dbck because dbck_enable_mask * used within _gpio_dbck_enable() is still not initialized at * that point. Therefore we have to enable dbck here. */ omap_gpio_dbck_enable(bank); if (bank->dbck_enable_mask) { bank->context.debounce = debounce; bank->context.debounce_en = val; } return 0; } /** * omap_clear_gpio_debounce - clear debounce settings for a gpio * @bank: the gpio bank we're acting upon * @offset: the gpio number on this @bank * * If a gpio is using debounce, then clear the debounce enable bit and if * this is the only gpio in this bank using debounce, then clear the debounce * time too. The debounce clock will also be disabled when calling this function * if this is the only gpio in the bank using debounce. */ static void omap_clear_gpio_debounce(struct gpio_bank *bank, unsigned offset) { u32 gpio_bit = BIT(offset); if (!bank->dbck_flag) return; if (!(bank->dbck_enable_mask & gpio_bit)) return; bank->dbck_enable_mask &= ~gpio_bit; bank->context.debounce_en &= ~gpio_bit; writel_relaxed(bank->context.debounce_en, bank->base + bank->regs->debounce_en); if (!bank->dbck_enable_mask) { bank->context.debounce = 0; writel_relaxed(bank->context.debounce, bank->base + bank->regs->debounce); clk_disable(bank->dbck); bank->dbck_enabled = false; } } static inline void omap_set_gpio_trigger(struct gpio_bank *bank, int gpio, unsigned trigger) { void __iomem *base = bank->base; u32 gpio_bit = BIT(gpio); omap_gpio_rmw(base, bank->regs->leveldetect0, gpio_bit, trigger & IRQ_TYPE_LEVEL_LOW); omap_gpio_rmw(base, bank->regs->leveldetect1, gpio_bit, trigger & IRQ_TYPE_LEVEL_HIGH); omap_gpio_rmw(base, bank->regs->risingdetect, gpio_bit, trigger & IRQ_TYPE_EDGE_RISING); omap_gpio_rmw(base, bank->regs->fallingdetect, gpio_bit, trigger & IRQ_TYPE_EDGE_FALLING); bank->context.leveldetect0 = readl_relaxed(bank->base + bank->regs->leveldetect0); bank->context.leveldetect1 = readl_relaxed(bank->base + bank->regs->leveldetect1); bank->context.risingdetect = readl_relaxed(bank->base + bank->regs->risingdetect); bank->context.fallingdetect = readl_relaxed(bank->base + bank->regs->fallingdetect); if (likely(!(bank->non_wakeup_gpios & gpio_bit))) { /* Defer wkup_en register update until we idle? */ if (bank->quirks & OMAP_GPIO_QUIRK_DEFERRED_WKUP_EN) { if (trigger) bank->context.wake_en |= gpio_bit; else bank->context.wake_en &= ~gpio_bit; } else { omap_gpio_rmw(base, bank->regs->wkup_en, gpio_bit, trigger != 0); bank->context.wake_en = readl_relaxed(bank->base + bank->regs->wkup_en); } } /* This part needs to be executed always for OMAP{34xx, 44xx} */ if (!bank->regs->irqctrl) { /* On omap24xx proceed only when valid GPIO bit is set */ if (bank->non_wakeup_gpios) { if (!(bank->non_wakeup_gpios & gpio_bit)) goto exit; } /* * Log the edge gpio and manually trigger the IRQ * after resume if the input level changes * to avoid irq lost during PER RET/OFF mode * Applies for omap2 non-wakeup gpio and all omap3 gpios */ if (trigger & IRQ_TYPE_EDGE_BOTH) bank->enabled_non_wakeup_gpios |= gpio_bit; else bank->enabled_non_wakeup_gpios &= ~gpio_bit; } exit: bank->level_mask = readl_relaxed(bank->base + bank->regs->leveldetect0) | readl_relaxed(bank->base + bank->regs->leveldetect1); } #ifdef CONFIG_ARCH_OMAP1 /* * This only applies to chips that can't do both rising and falling edge * detection at once. For all other chips, this function is a noop. */ static void omap_toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio) { void __iomem *reg = bank->base; u32 l = 0; if (!bank->regs->irqctrl) return; reg += bank->regs->irqctrl; l = readl_relaxed(reg); if ((l >> gpio) & 1) l &= ~(BIT(gpio)); else l |= BIT(gpio); writel_relaxed(l, reg); } #else static void omap_toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio) {} #endif static int omap_set_gpio_triggering(struct gpio_bank *bank, int gpio, unsigned trigger) { void __iomem *reg = bank->base; void __iomem *base = bank->base; u32 l = 0; if (bank->regs->leveldetect0 && bank->regs->wkup_en) { omap_set_gpio_trigger(bank, gpio, trigger); } else if (bank->regs->irqctrl) { reg += bank->regs->irqctrl; l = readl_relaxed(reg); if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) bank->toggle_mask |= BIT(gpio); if (trigger & IRQ_TYPE_EDGE_RISING) l |= BIT(gpio); else if (trigger & IRQ_TYPE_EDGE_FALLING) l &= ~(BIT(gpio)); else return -EINVAL; writel_relaxed(l, reg); } else if (bank->regs->edgectrl1) { if (gpio & 0x08) reg += bank->regs->edgectrl2; else reg += bank->regs->edgectrl1; gpio &= 0x07; l = readl_relaxed(reg); l &= ~(3 << (gpio << 1)); if (trigger & IRQ_TYPE_EDGE_RISING) l |= 2 << (gpio << 1); if (trigger & IRQ_TYPE_EDGE_FALLING) l |= BIT(gpio << 1); /* Enable wake-up during idle for dynamic tick */ omap_gpio_rmw(base, bank->regs->wkup_en, BIT(gpio), trigger); bank->context.wake_en = readl_relaxed(bank->base + bank->regs->wkup_en); writel_relaxed(l, reg); } return 0; } static void omap_enable_gpio_module(struct gpio_bank *bank, unsigned offset) { if (bank->regs->pinctrl) { void __iomem *reg = bank->base + bank->regs->pinctrl; /* Claim the pin for MPU */ writel_relaxed(readl_relaxed(reg) | (BIT(offset)), reg); } if (bank->regs->ctrl && !BANK_USED(bank)) { void __iomem *reg = bank->base + bank->regs->ctrl; u32 ctrl; ctrl = readl_relaxed(reg); /* Module is enabled, clocks are not gated */ ctrl &= ~GPIO_MOD_CTRL_BIT; writel_relaxed(ctrl, reg); bank->context.ctrl = ctrl; } } static void omap_disable_gpio_module(struct gpio_bank *bank, unsigned offset) { void __iomem *base = bank->base; if (bank->regs->wkup_en && !LINE_USED(bank->mod_usage, offset) && !LINE_USED(bank->irq_usage, offset)) { /* Disable wake-up during idle for dynamic tick */ omap_gpio_rmw(base, bank->regs->wkup_en, BIT(offset), 0); bank->context.wake_en = readl_relaxed(bank->base + bank->regs->wkup_en); } if (bank->regs->ctrl && !BANK_USED(bank)) { void __iomem *reg = bank->base + bank->regs->ctrl; u32 ctrl; ctrl = readl_relaxed(reg); /* Module is disabled, clocks are gated */ ctrl |= GPIO_MOD_CTRL_BIT; writel_relaxed(ctrl, reg); bank->context.ctrl = ctrl; } } static int omap_gpio_is_input(struct gpio_bank *bank, unsigned offset) { void __iomem *reg = bank->base + bank->regs->direction; return readl_relaxed(reg) & BIT(offset); } static void omap_gpio_init_irq(struct gpio_bank *bank, unsigned offset) { if (!LINE_USED(bank->mod_usage, offset)) { omap_enable_gpio_module(bank, offset); omap_set_gpio_direction(bank, offset, 1); } bank->irq_usage |= BIT(offset); } static int omap_gpio_irq_type(struct irq_data *d, unsigned type) { struct gpio_bank *bank = omap_irq_data_get_bank(d); int retval; unsigned long flags; unsigned offset = d->hwirq; if (type & ~IRQ_TYPE_SENSE_MASK) return -EINVAL; if (!bank->regs->leveldetect0 && (type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH))) return -EINVAL; raw_spin_lock_irqsave(&bank->lock, flags); retval = omap_set_gpio_triggering(bank, offset, type); if (retval) { raw_spin_unlock_irqrestore(&bank->lock, flags); goto error; } omap_gpio_init_irq(bank, offset); if (!omap_gpio_is_input(bank, offset)) { raw_spin_unlock_irqrestore(&bank->lock, flags); retval = -EINVAL; goto error; } raw_spin_unlock_irqrestore(&bank->lock, flags); if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH)) irq_set_handler_locked(d, handle_level_irq); else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)) /* * Edge IRQs are already cleared/acked in irq_handler and * not need to be masked, as result handle_edge_irq() * logic is excessed here and may cause lose of interrupts. * So just use handle_simple_irq. */ irq_set_handler_locked(d, handle_simple_irq); return 0; error: return retval; } static void omap_clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask) { void __iomem *reg = bank->base; reg += bank->regs->irqstatus; writel_relaxed(gpio_mask, reg); /* Workaround for clearing DSP GPIO interrupts to allow retention */ if (bank->regs->irqstatus2) { reg = bank->base + bank->regs->irqstatus2; writel_relaxed(gpio_mask, reg); } /* Flush posted write for the irq status to avoid spurious interrupts */ readl_relaxed(reg); } static inline void omap_clear_gpio_irqstatus(struct gpio_bank *bank, unsigned offset) { omap_clear_gpio_irqbank(bank, BIT(offset)); } static u32 omap_get_gpio_irqbank_mask(struct gpio_bank *bank) { void __iomem *reg = bank->base; u32 l; u32 mask = (BIT(bank->width)) - 1; reg += b/* * Copyright (c) 2015, National Instruments Corp. * * Xilinx Zynq Reset controller driver * * Author: Moritz Fischer <moritz.fischer@ettus.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <linux/err.h> #include <linux/io.h> #include <linux/init.h> #include <linux/mfd/syscon.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/reset-controller.h> #include <linux/regmap.h> #include <linux/types.h> struct zynq_reset_data { struct regmap *slcr; struct reset_controller_dev rcdev; u32 offset; }; #define to_zynq_reset_data(p) \ container_of((p), struct zynq_reset_data, rcdev) static int zynq_reset_assert(struct reset_controller_dev *rcdev, unsigned long id) { struct zynq_reset_data *priv = to_zynq_reset_data(rcdev); int bank = id / BITS_PER_LONG; int offset = id % BITS_PER_LONG; pr_debug("%s: %s reset bank %u offset %u\n", KBUILD_MODNAME, __func__, bank, offset); return regmap_update_bits(priv->slcr, priv->offset + (bank * 4), BIT(offset), BIT(offset)); } static int zynq_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id) { struct zynq_reset_data *priv = to_zynq_reset_data(rcdev); int bank = id / BITS_PER_LONG; int offset = id % BITS_PER_LONG; pr_debug("%s: %s reset bank %u offset %u\n", KBUILD_MODNAME, __func__, bank, offset); return regmap_update_bits(priv->slcr, priv->offset + (bank * 4), BIT(offset), ~BIT(offset)); } static int zynq_reset_status(struct reset_controller_dev *rcdev, unsigned long id) { struct zynq_reset_data *priv = to_zynq_reset_data(rcdev); int bank = id / BITS_PER_LONG; int offset = id % BITS_PER_LONG; int ret; u32 reg; pr_debug("%s: %s reset bank %u offset %u\n", KBUILD_MODNAME, __func__, bank, offset); ret = regmap_read(priv->slcr, priv->offset + (bank * 4), &reg); if (ret) return ret; return !!(reg & BIT(offset)); } static const struct reset_control_ops zynq_reset_ops = { .assert = zynq_reset_assert, .deassert = zynq_reset_deassert, .status = zynq_reset_status, }; static int zynq_reset_probe(struct platform_device *pdev) { struct resource *res; struct zynq_reset_data *priv; priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; platform_set_drvdata(pdev, priv); priv->slcr = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "syscon"); if (IS_ERR(priv->slcr)) { dev_err(&pdev->dev, "unable to get zynq-slcr regmap"); return PTR_ERR(priv->slcr); } res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { dev_err(&pdev->dev, "missing IO resource\n"); return -ENODEV; } priv->offset = res->start; priv->rcdev.owner = THIS_MODULE; priv->rcdev.nr_resets = resource_size(res) / 4 * BITS_PER_LONG; priv->rcdev.ops = &zynq_reset_ops; priv->rcdev.of_node = pdev->dev.of_node; return devm_reset_controller_register(&pdev->dev, &priv->rcdev); } static const struct of_device_id zynq_reset_dt_ids[] = { { .compatible = "xlnx,zynq-reset", }, { /* sentinel */ }, }; static struct platform_driver zynq_reset_driver = { .probe = zynq_reset_probe, .driver = { .name = KBUILD_MODNAME, .of_match_table = zynq_reset_dt_ids, }, }; builtin_platform_driver(zynq_reset_driver);
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-11-14 07:32:13 +0100
ment(config); return omap_gpio_debounce(chip, offset, debounce); } static void omap_gpio_set(struct gpio_chip *chip, unsigned offset, int value) { struct gpio_bank *bank; unsigned long flags; bank = gpiochip_get_data(chip); raw_spin_lock_irqsave(&bank->lock, flags); bank->set_dataout(bank, offset, value); raw_spin_unlock_irqrestore(&bank->lock, flags); } static void omap_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask, unsigned long *bits) { struct gpio_bank *bank = gpiochip_get_data(chip); unsigned long flags; raw_spin_lock_irqsave(&bank->lock, flags); bank->set_dataout_multiple(bank, mask, bits); raw_spin_unlock_irqrestore(&bank->lock, flags); } /*---------------------------------------------------------------------*/ static void omap_gpio_show_rev(struct gpio_bank *bank) { static bool called; u32 rev; if (called || bank->regs->revision == USHRT_MAX) return; rev = readw_relaxed(bank->base + bank->regs->revision); pr_info("OMAP GPIO hardware version %d.%d\n", (rev >> 4) & 0x0f, rev & 0x0f); called = true; } static void omap_gpio_mod_init(struct gpio_bank *bank) { void __iomem *base = bank->base; u32 l = 0xffffffff; if (bank->width == 16) l = 0xffff; if (bank->is_mpuio) { writel_relaxed(l, bank->base + bank->regs->irqenable); return; } omap_gpio_rmw(base, bank->regs->irqenable, l, bank->regs->irqenable_inv); omap_gpio_rmw(base, bank->regs->irqstatus, l, !bank->regs->irqenable_inv); if (bank->regs->debounce_en) writel_relaxed(0, base + bank->regs->debounce_en); /* Save OE default value (0xffffffff) in the context */ bank->context.oe = readl_relaxed(bank->base + bank->regs->direction); /* Initialize interface clk ungated, module enabled */ if (bank->regs->ctrl) writel_relaxed(0, base + bank->regs->ctrl); } static int omap_gpio_chip_init(struct gpio_bank *bank, struct irq_chip *irqc) { struct gpio_irq_chip *irq; static int gpio; const char *label; int irq_base = 0; int ret; /* * REVISIT eventually switch from OMAP-specific gpio structs * over to the generic ones */ bank->chip.request = omap_gpio_request; bank->chip.free = omap_gpio_free; bank->chip.get_direction = omap_gpio_get_direction; bank->chip.direction_input = omap_gpio_input; bank->chip.get = omap_gpio_get; bank->chip.get_multiple = omap_gpio_get_multiple; bank->chip.direction_output = omap_gpio_output; bank->chip.set_config = omap_gpio_set_config; bank->chip.set = omap_gpio_set; bank->chip.set_multiple = omap_gpio_set_multiple; if (bank->is_mpuio) { bank->chip.label = "mpuio"; if (bank->regs->wkup_en) bank->chip.parent = &omap_mpuio_device.dev; bank->chip.base = OMAP_MPUIO(0); } else { label = devm_kasprintf(bank->chip.parent, GFP_KERNEL, "gpio-%d-%d", gpio, gpio + bank->width - 1); if (!label) return -ENOMEM; bank->chip.label = label; bank->chip.base = gpio; } bank->chip.ngpio = bank->width; #ifdef CONFIG_ARCH_OMAP1 /* * REVISIT: Once we have OMAP1 supporting SPARSE_IRQ, we can drop * irq_alloc_descs() since a base IRQ offset will no longer be needed. */ irq_base = devm_irq_alloc_descs(bank->chip.parent, -1, 0, bank->width, 0); if (irq_base < 0) { dev_err(bank->chip.parent, "Couldn't allocate IRQ numbers\n"); return -ENODEV; } #endif /* MPUIO is a bit different, reading IRQ status clears it */ if (bank->is_mpuio) { irqc->irq_ack = dummy_irq_chip.irq_ack; if (!bank->regs->wkup_en) irqc->irq_set_wake = NULL; } irq = &bank->chip.irq; irq->chip = irqc; irq->handler = handle_bad_irq; irq->default_type = IRQ_TYPE_NONE; irq->num_parents = 1; irq->parents = &bank->irq; irq->first = irq_base; ret = gpiochip_add_data(&bank->chip, bank); if (ret) { dev_err(bank->chip.parent, "Could not register gpio chip %d\n", ret); return ret; } ret = devm_request_irq(bank->chip.parent, bank->irq, omap_gpio_irq_handler, 0, dev_name(bank->chip.parent), bank); if (ret) gpiochip_remove(&bank->chip); if (!bank->is_mpuio) gpio += bank->width; return ret; } static void omap_gpio_idle(struct gpio_bank *bank, bool may_lose_context); static void omap_gpio_unidle(struct gpio_bank *bank); static int gpio_omap_cpu_notifier(struct notifier_block *nb, unsigned long cmd, void *v) { struct gpio_bank *bank; unsigned long flags; bank = container_of(nb, struct gpio_bank, nb); raw_spin_lock_irqsave(&bank->lock, flags); switch (cmd) { case CPU_CLUSTER_PM_ENTER: if (bank->is_suspended) break; omap_gpio_idle(bank, true); break; case CPU_CLUSTER_PM_ENTER_FAILED: case CPU_CLUSTER_PM_EXIT: if (bank->is_suspended) break; omap_gpio_unidle(bank); break; } raw_spin_unlock_irqrestore(&bank->lock, flags); return NOTIFY_OK; } static const struct of_device_id omap_gpio_match[]; static int omap_gpio_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct device_node *node = dev->of_node; const struct of_device_id *match; const struct omap_gpio_platform_data *pdata; struct resource *res; struct gpio_bank *bank; struct irq_chip *irqc; int ret; match = of_match_device(of_match_ptr(omap_gpio_match), dev); pdata = match ? match->data : dev_get_platdata(dev); if (!pdata) return -EINVAL; bank = devm_kzalloc(dev, sizeof(*bank), GFP_KERNEL); if (!bank) return -ENOMEM; irqc = devm_kzalloc(dev, sizeof(*irqc), GFP_KERNEL); if (!irqc) return -ENOMEM; irqc->irq_startup = omap_gpio_irq_startup, irqc->irq_shutdown = omap_gpio_irq_shutdown, irqc->irq_ack = omap_gpio_ack_irq, irqc->irq_mask = omap_gpio_mask_irq, irqc->irq_unmask = omap_gpio_unmask_irq, irqc->irq_set_type = omap_gpio_irq_type, irqc->irq_set_wake = omap_gpio_wake_enable, irqc->irq_bus_lock = omap_gpio_irq_bus_lock, irqc->irq_bus_sync_unlock = gpio_irq_bus_sync_unlock, irqc->name = dev_name(&pdev->dev); irqc->flags = IRQCHIP_MASK_ON_SUSPEND; irqc->parent_device = dev; bank->irq = platform_get_irq(pdev, 0); if (bank->irq <= 0) { if (!bank->irq) bank->irq = -ENXIO; if (bank->irq != -EPROBE_DEFER) dev_err(dev, "can't get irq resource ret=%d\n", bank->irq); return bank->irq; } bank->chip.parent = dev; bank->chip.owner = THIS_MODULE; bank->dbck_flag = pdata->dbck_flag; bank->quirks = pdata->quirks; bank->stride = pdata->bank_stride; bank->width = pdata->bank_width; bank->is_mpuio = pdata->is_mpuio; bank->non_wakeup_gpios = pdata->non_wakeup_gpios; bank->regs = pdata->regs; #ifdef CONFIG_OF_GPIO bank->chip.of_node = of_node_get(node); #endif if (node) { if (!of_property_read_bool(node, "ti,gpio-always-on")) bank->loses_context = true; } else { bank->loses_context = pdata->loses_context; if (bank->loses_context) bank->get_context_loss_count = pdata->get_context_loss_count; } if (bank->regs->set_dataout && bank->regs->clr_dataout) { bank->set_dataout = omap_set_gpio_dataout_reg; bank->set_dataout_multiple = omap_set_gpio_dataout_reg_multiple; } else { bank->set_dataout = omap_set_gpio_dataout_mask; bank->set_dataout_multiple = omap_set_gpio_dataout_mask_multiple; } if (bank->quirks & OMAP_GPIO_QUIRK_DEFERRED_WKUP_EN) { bank->funcs.idle_enable_level_quirk = omap4_gpio_enable_level_quirk; bank->funcs.idle_disable_level_quirk = omap4_gpio_disable_level_quirk; } else if (bank->quirks & OMAP_GPIO_QUIRK_IDLE_REMOVE_TRIGGER) { bank->funcs.idle_enable_level_quirk = omap2_gpio_enable_level_quirk; bank->funcs.idle_disable_level_quirk = omap2_gpio_disable_level_quirk; } raw_spin_lock_init(&bank->lock); raw_spin_lock_init(&bank->wa_lock); /* Static mapping, never released */ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); bank->base = devm_ioremap_resource(dev, res); if (IS_ERR(bank->base)) { return PTR_ERR(bank->base); } if (bank->dbck_flag) { bank->dbck = devm_clk_get(dev, "dbclk"); if (IS_ERR(bank->dbck)) { dev_err(dev, "Could not get gpio dbck. Disable debounce\n"); bank->dbck_flag = false; } else { clk_prepare(bank->dbck); } } platform_set_drvdata(pdev, bank); pm_runtime_enable(dev); pm_runtime_get_sync(dev); if (bank->is_mpuio) omap_mpuio_init(bank); omap_gpio_mod_init(bank); ret = omap_gpio_chip_init(bank, irqc); if (ret) { pm_runtime_put_sync(dev); pm_runtime_disable(dev); if (bank->dbck_flag) clk_unprepare(bank->dbck); return ret; } omap_gpio_show_rev(bank); if (bank->funcs.idle_enable_level_quirk && bank->funcs.idle_disable_level_quirk) { bank->nb.notifier_call = gpio_omap_cpu_notifier; cpu_pm_register_notifier(&bank->nb); } pm_runtime_put(dev); return 0; } static int omap_gpio_remove(struct platform_device *pdev) { struct gpio_bank *bank = platform_get_drvdata(pdev); if (bank->nb.notifier_call) cpu_pm_unregister_notifier(&bank->nb); list_del(&bank->node); gpiochip_remove(&bank->chip); pm_runtime_disable(&pdev->dev); if (bank->dbck_flag) clk_unprepare(bank->dbck); return 0; } static void omap_gpio_restore_context(struct gpio_bank *bank); static void omap_gpio_idle(struct gpio_bank *bank, bool may_lose_context) { struct device *dev = bank->chip.parent; u32 l1 = 0, l2 = 0; if (bank->funcs.idle_enable_level_quirk) bank->funcs.idle_enable_level_quirk(bank); if (!bank->enabled_non_wakeup_gpios) goto update_gpio_context_count; if (!may_lose_context) goto update_gpio_context_count; /* * If going to OFF, remove triggering for all * non-wakeup GPIOs. Otherwise spurious IRQs will be * generated. See OMAP2420 Errata item 1.101. */ bank->saved_datain = readl_relaxed(bank->base + bank->regs->datain); l1 = bank->context.fallingdetect; l2 = bank->context.risingdetect; l1 &= ~bank->enabled_non_wakeup_gpios; l2 &= ~bank->enabled_non_wakeup_gpios; writel_relaxed(l1, bank->base + bank->regs->fallingdetect); writel_relaxed(l2, bank->base + bank->regs->risingdetect); bank->workaround_enabled = true; update_gpio_context_count: if (bank->get_context_loss_count) bank->context_loss_count = bank->get_context_loss_count(dev); omap_gpio_dbck_disable(bank); } static void omap_gpio_init_context(struct gpio_bank *p); static void omap_gpio_unidle(struct gpio_bank *bank) { struct device *dev = bank->chip.parent; u32 l = 0, gen, gen0, gen1; int c; /* * On the first resume during the probe, the context has not * been initialised and so initialise it now. Also initialise * the context loss count. */ if (bank->loses_context && !bank->context_valid) { omap_gpio_init_context(bank); if (bank->get_context_loss_count) bank->context_loss_count = bank->get_context_loss_count(dev); } omap_gpio_dbck_enable(bank); if (bank->funcs.idle_disable_level_quirk) bank->funcs.idle_disable_level_quirk(bank); if (bank->loses_context) { if (!bank->get_context_loss_count) { omap_gpio_restore_context(bank); } else { c = bank->get_context_loss_count(dev); if (c != bank->context_loss_count) { omap_gpio_restore_context(bank); } else { return; } } } if (!bank->workaround_enabled) return; l = readl_relaxed(bank->base + bank->regs->datain); /* * Check if any of the non-wakeup interrupt GPIOs have changed * state. If so, generate an IRQ by software. This is * horribly racy, but it's the best we can do to work around * this silicon bug. */ l ^= bank->saved_datain; l &= bank->enabled_non_wakeup_gpios; /* * No need to generate IRQs for the rising edge for gpio IRQs * configured with falling edge only; and vice versa. */ gen0 = l & bank->context.fallingdetect; gen0 &= bank->saved_datain; gen1 = l & bank->context.risingdetect; gen1 &= ~(bank->saved_datain); /* FIXME: Consider GPIO IRQs with level detections properly! */ gen = l & (~(bank->context.fallingdetect) & ~(bank->context.risingdetect)); /* Consider all GPIO IRQs needed to be updated */ gen |= gen0 | gen1; if (gen) { u32 old0, old1; old0 = readl_relaxed(bank->base + bank->regs->leveldetect0); old1 = readl_relaxed(bank->base + bank->regs->leveldetect1); if (!bank->regs->irqstatus_raw0) { writel_relaxed(old0 | gen, bank->base + bank->regs->leveldetect0); writel_relaxed(old1 | gen, bank->base + bank->regs->leveldetect1); } if (bank->regs->irqstatus_raw0) { writel_relaxed(old0 | l, bank->base + bank->regs->leveldetect0); writel_relaxed(old1 | l, bank->base + bank->regs->leveldetect1); } writel_relaxed(old0, bank->base + bank->regs->leveldetect0); writel_relaxed(old1, bank->base + bank->regs->leveldetect1); } bank->workaround_enabled = false; } static void omap_gpio_init_context(struct gpio_bank *p) { struct omap_gpio_reg_offs *regs = p->regs; void __iomem *base = p->base; p->context.ctrl = readl_relaxed(base + regs->ctrl); p->context.oe = readl_relaxed(base + regs->direction); p->context.wake_en = readl_relaxed(base + regs->wkup_en); p->context.leveldetect0 = readl_relaxed(base + regs->leveldetect0); p->context.leveldetect1 = readl_relaxed(base + regs->leveldetect1); p->context.risingdetect = readl_relaxed(base + regs->risingdetect); p->context.fallingdetect = readl_relaxed(base + regs->fallingdetect); p->context.irqenable1 = readl_relaxed(base + regs->irqenable); p->context.irqenable2 = readl_relaxed(base + regs->irqenable2); if (regs->set_dataout && p->regs->clr_dataout) p->context.dataout = readl_relaxed(base + regs->set_dataout); else p->context.dataout = readl_relaxed(base + regs->dataout); p->context_valid = true; } static void omap_gpio_restore_context(struct gpio_bank *bank) { writel_relaxed(bank->context.wake_en, bank->base + bank->regs->wkup_en); writel_relaxed(bank->context.ctrl, bank->base + bank->regs->ctrl); writel_relaxed(bank->context.leveldetect0, bank->base + bank->regs->leveldetect0); writel_relaxed(bank->context.leveldetect1, bank->base + bank->regs->leveldetect1); writel_relaxed(bank->context.risingdetect, bank->base + bank->regs->risingdetect); writel_relaxed(bank->context.fallingdetect, bank->base + bank->regs->fallingdetect); if (bank->regs->set_dataout && bank->regs->clr_dataout) writel_relaxed(bank->context.dataout, bank->base + bank->regs->set_dataout); else writel_relaxed(bank->context.dataout, bank->base + bank->regs->dataout); writel_relaxed(bank->context.oe, bank->base + bank->regs->direction); if (bank->dbck_enable_mask) { writel_relaxed(bank->context.debounce, bank->base + bank->regs->debounce); writel_relaxed(bank->context.debounce_en, bank->base + bank->regs->debounce_en); } writel_relaxed(bank->context.irqenable1, bank->base + bank->regs->irqenable); writel_relaxed(bank->context.irqenable2, bank->base + bank->regs->irqenable2); } static int __maybe_unused omap_gpio_runtime_suspend(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct gpio_bank *bank = platform_get_drvdata(pdev); unsigned long flags; int error = 0; raw_spin_lock_irqsave(&bank->lock, flags); /* Must be idled only by CPU_CLUSTER_PM_ENTER? */ if (bank->irq_usage) { error = -EBUSY; goto unlock; } omap_gpio_idle(bank, true); bank->is_suspended = true; unlock: raw_spin_unlock_irqrestore(&bank->lock, flags); return error; } static int __maybe_unused omap_gpio_runtime_resume(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct gpio_bank *bank = platform_get_drvdata(pdev); unsigned long flags; int error = 0; raw_spin_lock_irqsave(&bank->lock, flags); /* Must be unidled only by CPU_CLUSTER_PM_ENTER? */ if (bank->irq_usage) { error = -EBUSY; goto unlock; } omap_gpio_unidle(bank); bank->is_suspended = false; unlock: raw_spin_unlock_irqrestore(&bank->lock, flags); return error; } #ifdef CONFIG_ARCH_OMAP2PLUS static const struct dev_pm_ops gpio_pm_ops = { SET_RUNTIME_PM_OPS(omap_gpio_runtime_suspend, omap_gpio_runtime_resume, NULL) }; #else static const struct dev_pm_ops gpio_pm_ops; #endif /* CONFIG_ARCH_OMAP2PLUS */ #if defined(CONFIG_OF) static struct omap_gpio_reg_offs omap2_gpio_regs = { .revision = OMAP24XX_GPIO_REVISION, .direction = OMAP24XX_GPIO_OE, .datain = OMAP24XX_GPIO_DATAIN, .dataout = OMAP24XX_GPIO_DATAOUT, .set_dataout = OMAP24XX_GPIO_SETDATAOUT, .clr_dataout = OMAP24XX_GPIO_CLEARDATAOUT, .irqstatus = OMAP24XX_GPIO_IRQSTATUS1, .irqstatus2 = OMAP24XX_GPIO_IRQSTATUS2, .irqenable = OMAP24XX_GPIO_IRQENABLE1, .irqenable2 = OMAP24XX_GPIO_IRQENABLE2, .set_irqenable = OMAP24XX_GPIO_SETIRQENABLE1, .clr_irqenable = OMAP24XX_GPIO_CLEARIRQENABLE1, .debounce = OMAP24XX_GPIO_DEBOUNCE_VAL, .debounce_en = OMAP24XX_GPIO_DEBOUNCE_EN, .ctrl = OMAP24XX_GPIO_CTRL, .wkup_en = OMAP24XX_GPIO_WAKE_EN, .leveldetect0 = OMAP24XX_GPIO_LEVELDETECT0, .leveldetect1 = OMAP24XX_GPIO_LEVELDETECT1, .risingdetect = OMAP24XX_GPIO_RISINGDETECT, .fallingdetect = OMAP24XX_GPIO_FALLINGDETECT, }; static struct omap_gpio_reg_offs omap4_gpio_regs = { .revision = OMAP4_GPIO_REVISION, .direction = OMAP4_GPIO_OE, .datain = OMAP4_GPIO_DATAIN, .dataout = OMAP4_GPIO_DATAOUT, .set_dataout = OMAP4_GPIO_SETDATAOUT, .clr_dataout = OMAP4_GPIO_CLEARDATAOUT, .irqstatus = OMAP4_GPIO_IRQSTATUS0, .irqstatus2 = OMAP4_GPIO_IRQSTATUS1, .irqenable = OMAP4_GPIO_IRQSTATUSSET0, .irqenable2 = OMAP4_GPIO_IRQSTATUSSET1, .set_irqenable = OMAP4_GPIO_IRQSTATUSSET0, .clr_irqenable = OMAP4_GPIO_IRQSTATUSCLR0, .debounce = OMAP4_GPIO_DEBOUNCINGTIME, .debounce_en = OMAP4_GPIO_DEBOUNCENABLE, .ctrl = OMAP4_GPIO_CTRL, .wkup_en = OMAP4_GPIO_IRQWAKEN0, .leveldetect0 = OMAP4_GPIO_LEVELDETECT0, .leveldetect1 = OMAP4_GPIO_LEVELDETECT1, .risingdetect = OMAP4_GPIO_RISINGDETECT, .fallingdetect = OMAP4_GPIO_FALLINGDETECT, }; /* * Note that omap2 does not currently support idle modes with context loss so * no need to add OMAP_GPIO_QUIRK_IDLE_REMOVE_TRIGGER quirk flag to save * and restore context. */ static const struct omap_gpio_platform_data omap2_pdata = { .regs = &omap2_gpio_regs, .bank_width = 32, .dbck_flag = false, }; static const struct omap_gpio_platform_data omap3_pdata = { .regs = &omap2_gpio_regs, .bank_width = 32, .dbck_flag = true, .quirks = OMAP_GPIO_QUIRK_IDLE_REMOVE_TRIGGER, }; static const struct omap_gpio_platform_data omap4_pdata = { .regs = &omap4_gpio_regs, .bank_width = 32, .dbck_flag = true, .quirks = OMAP_GPIO_QUIRK_IDLE_REMOVE_TRIGGER | OMAP_GPIO_QUIRK_DEFERRED_WKUP_EN, }; static const struct of_device_id omap_gpio_match[] = { { .compatible = "ti,omap4-gpio", .data = &omap4_pdata, }, { .compatible = "ti,omap3-gpio", .data = &omap3_pdata, }, { .compatible = "ti,omap2-gpio", .data = &omap2_pdata, }, { }, }; MODULE_DEVICE_TABLE(of, omap_gpio_match); #endif static struct platform_driver omap_gpio_driver = { .probe = omap_gpio_probe, .remove = omap_gpio_remove, .driver = { .name = "omap_gpio", .pm = &gpio_pm_ops, .of_match_table = of_match_ptr(omap_gpio_match), }, }; /* * gpio driver register needs to be done before * machine_init functions access gpio APIs. * Hence omap_gpio_drv_reg() is a postcore_initcall. */ static int __init omap_gpio_drv_reg(void) { return platform_driver_register(&omap_gpio_driver); } postcore_initcall(omap_gpio_drv_reg); static void __exit omap_gpio_exit(void) { platform_driver_unregister(&omap_gpio_driver); } module_exit(omap_gpio_exit); MODULE_DESCRIPTION("omap gpio driver"); MODULE_ALIAS("platform:gpio-omap"); MODULE_LICENSE("GPL v2");