| /* |
| * Copyright (c) 2014 MediaTek Inc. |
| * Author: Flora Fu, MediaTek |
| * |
| * 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. |
| * |
| * 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/interrupt.h> |
| #include <linux/module.h> |
| #include <linux/of_device.h> |
| #include <linux/of_irq.h> |
| #include <linux/regmap.h> |
| #include <linux/mfd/core.h> |
| #include <linux/mfd/mt6397/core.h> |
| #include <linux/mfd/mt6397/registers.h> |
| |
| static const struct mfd_cell mt6397_devs[] = { |
| { |
| .name = "mt6397-rtc", |
| .of_compatible = "mediatek,mt6397-rtc", |
| }, { |
| .name = "mt6397-regulator", |
| .of_compatible = "mediatek,mt6397-regulator", |
| }, { |
| .name = "mt6397-codec", |
| .of_compatible = "mediatek,mt6397-codec", |
| }, { |
| .name = "mt6397-clk", |
| .of_compatible = "mediatek,mt6397-clk", |
| }, |
| }; |
| |
| static void mt6397_irq_lock(struct irq_data *data) |
| { |
| struct mt6397_chip *mt6397 = irq_get_chip_data(data->irq); |
| |
| mutex_lock(&mt6397->irqlock); |
| } |
| |
| static void mt6397_irq_sync_unlock(struct irq_data *data) |
| { |
| struct mt6397_chip *mt6397 = irq_get_chip_data(data->irq); |
| |
| regmap_write(mt6397->regmap, MT6397_INT_CON0, mt6397->irq_masks_cur[0]); |
| regmap_write(mt6397->regmap, MT6397_INT_CON1, mt6397->irq_masks_cur[1]); |
| |
| mutex_unlock(&mt6397->irqlock); |
| } |
| |
| static void mt6397_irq_disable(struct irq_data *data) |
| { |
| struct mt6397_chip *mt6397 = irq_get_chip_data(data->irq); |
| int shift = data->hwirq & 0xf; |
| int reg = data->hwirq >> 4; |
| |
| mt6397->irq_masks_cur[reg] &= ~BIT(shift); |
| } |
| |
| static void mt6397_irq_enable(struct irq_data *data) |
| { |
| struct mt6397_chip *mt6397 = irq_get_chip_data(data->irq); |
| int shift = data->hwirq & 0xf; |
| int reg = data->hwirq >> 4; |
| |
| mt6397->irq_masks_cur[reg] |= BIT(shift); |
| } |
| |
| static struct irq_chip mt6397_irq_chip = { |
| .name = "mt6397-irq", |
| .irq_bus_lock = mt6397_irq_lock, |
| .irq_bus_sync_unlock = mt6397_irq_sync_unlock, |
| .irq_enable = mt6397_irq_enable, |
| .irq_disable = mt6397_irq_disable, |
| }; |
| |
| static void mt6397_irq_handle_reg(struct mt6397_chip *mt6397, int reg, |
| int irqbase) |
| { |
| unsigned int status; |
| int i, irq, ret; |
| |
| ret = regmap_read(mt6397->regmap, reg, &status); |
| if (ret) { |
| dev_err(mt6397->dev, "Failed to read irq status: %d\n", ret); |
| return; |
| } |
| |
| for (i = 0; i < 16; i++) { |
| if (status & BIT(i)) { |
| irq = irq_find_mapping(mt6397->irq_domain, irqbase + i); |
| if (irq) |
| handle_nested_irq(irq); |
| } |
| } |
| |
| regmap_write(mt6397->regmap, reg, status); |
| } |
| |
| static irqreturn_t mt6397_irq_thread(int irq, void *data) |
| { |
| struct mt6397_chip *mt6397 = data; |
| |
| mt6397_irq_handle_reg(mt6397, MT6397_INT_STATUS0, 0); |
| mt6397_irq_handle_reg(mt6397, MT6397_INT_STATUS1, 16); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static int mt6397_irq_domain_map(struct irq_domain *d, unsigned int irq, |
| irq_hw_number_t hw) |
| { |
| struct mt6397_chip *mt6397 = d->host_data; |
| |
| irq_set_chip_data(irq, mt6397); |
| irq_set_chip_and_handler(irq, &mt6397_irq_chip, handle_level_irq); |
| irq_set_nested_thread(irq, 1); |
| #ifdef CONFIG_ARM |
| set_irq_flags(irq, IRQF_VALID); |
| #else |
| irq_set_noprobe(irq); |
| #endif |
| |
| return 0; |
| } |
| |
| static const struct irq_domain_ops mt6397_irq_domain_ops = { |
| .map = mt6397_irq_domain_map, |
| }; |
| |
| static int mt6397_irq_init(struct mt6397_chip *mt6397) |
| { |
| int ret; |
| |
| mutex_init(&mt6397->irqlock); |
| |
| /* Mask all interrupt sources */ |
| regmap_write(mt6397->regmap, MT6397_INT_CON0, 0x0); |
| regmap_write(mt6397->regmap, MT6397_INT_CON1, 0x0); |
| |
| mt6397->irq_domain = irq_domain_add_linear(mt6397->dev->of_node, |
| MT6397_IRQ_NR, &mt6397_irq_domain_ops, mt6397); |
| if (!mt6397->irq_domain) { |
| dev_err(mt6397->dev, "could not create irq domain\n"); |
| return -ENOMEM; |
| } |
| |
| ret = devm_request_threaded_irq(mt6397->dev, mt6397->irq, NULL, |
| mt6397_irq_thread, IRQF_ONESHOT, "mt6397-pmic", mt6397); |
| if (ret) { |
| dev_err(mt6397->dev, "failed to register irq=%d; err: %d\n", |
| mt6397->irq, ret); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static int mt6397_probe(struct platform_device *pdev) |
| { |
| int ret; |
| struct mt6397_chip *mt6397; |
| |
| mt6397 = devm_kzalloc(&pdev->dev, sizeof(*mt6397), GFP_KERNEL); |
| if (!mt6397) |
| return -ENOMEM; |
| |
| mt6397->dev = &pdev->dev; |
| /* |
| * mt6397 MFD is child device of soc pmic wrapper. |
| * Regmap is set from its parent. |
| */ |
| mt6397->regmap = dev_get_regmap(pdev->dev.parent, NULL); |
| if (!mt6397->regmap) |
| return -ENODEV; |
| |
| platform_set_drvdata(pdev, mt6397); |
| |
| mt6397->irq = platform_get_irq(pdev, 0); |
| if (mt6397->irq > 0) { |
| ret = mt6397_irq_init(mt6397); |
| if (ret) |
| return ret; |
| } |
| |
| ret = mfd_add_devices(&pdev->dev, -1, mt6397_devs, |
| ARRAY_SIZE(mt6397_devs), NULL, 0, NULL); |
| if (ret) |
| dev_err(&pdev->dev, "failed to add child devices: %d\n", ret); |
| |
| return ret; |
| } |
| |
| static int mt6397_remove(struct platform_device *pdev) |
| { |
| mfd_remove_devices(&pdev->dev); |
| |
| return 0; |
| } |
| |
| static const struct of_device_id mt6397_of_match[] = { |
| { .compatible = "mediatek,mt6397" }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(of, mt6397_of_match); |
| |
| static struct platform_driver mt6397_driver = { |
| .probe = mt6397_probe, |
| .remove = mt6397_remove, |
| .driver = { |
| .name = "mt6397", |
| .of_match_table = of_match_ptr(mt6397_of_match), |
| }, |
| }; |
| |
| module_platform_driver(mt6397_driver); |
| |
| MODULE_AUTHOR("Flora Fu, MediaTek"); |
| MODULE_DESCRIPTION("Driver for MediaTek MT6397 PMIC"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS("platform:mt6397"); |