diff options
Diffstat (limited to 'drivers/mfd/hi655x-pmic.c')
| -rw-r--r-- | drivers/mfd/hi655x-pmic.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/drivers/mfd/hi655x-pmic.c b/drivers/mfd/hi655x-pmic.c new file mode 100644 index 000000000000..05ddc7882362 --- /dev/null +++ b/drivers/mfd/hi655x-pmic.c @@ -0,0 +1,162 @@ +/* + * Device driver for MFD hi655x PMIC + * + * Copyright (c) 2016 Hisilicon. + * + * Authors: + * Chen Feng <puck.chen@hisilicon.com> + * Fei Wang <w.f@huawei.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/gpio.h> +#include <linux/io.h> +#include <linux/interrupt.h> +#include <linux/init.h> +#include <linux/mfd/core.h> +#include <linux/mfd/hi655x-pmic.h> +#include <linux/module.h> +#include <linux/of_gpio.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> + +static const struct mfd_cell hi655x_pmic_devs[] = { + { .name = "hi655x-regulator", }, +}; + +static const struct regmap_irq hi655x_irqs[] = { + { .reg_offset = 0, .mask = OTMP_D1R_INT }, + { .reg_offset = 0, .mask = VSYS_2P5_R_INT }, + { .reg_offset = 0, .mask = VSYS_UV_D3R_INT }, + { .reg_offset = 0, .mask = VSYS_6P0_D200UR_INT }, + { .reg_offset = 0, .mask = PWRON_D4SR_INT }, + { .reg_offset = 0, .mask = PWRON_D20F_INT }, + { .reg_offset = 0, .mask = PWRON_D20R_INT }, + { .reg_offset = 0, .mask = RESERVE_INT }, +}; + +static const struct regmap_irq_chip hi655x_irq_chip = { + .name = "hi655x-pmic", + .irqs = hi655x_irqs, + .num_regs = 1, + .num_irqs = ARRAY_SIZE(hi655x_irqs), + .status_base = HI655X_IRQ_STAT_BASE, + .mask_base = HI655X_IRQ_MASK_BASE, +}; + +static struct regmap_config hi655x_regmap_config = { + .reg_bits = 32, + .reg_stride = HI655X_STRIDE, + .val_bits = 8, + .max_register = HI655X_BUS_ADDR(0xFFF), +}; + +static void hi655x_local_irq_clear(struct regmap *map) +{ + int i; + + regmap_write(map, HI655X_ANA_IRQM_BASE, HI655X_IRQ_CLR); + for (i = 0; i < HI655X_IRQ_ARRAY; i++) { + regmap_write(map, HI655X_IRQ_STAT_BASE + i * HI655X_STRIDE, + HI655X_IRQ_CLR); + } +} + +static int hi655x_pmic_probe(struct platform_device *pdev) +{ + int ret; + struct hi655x_pmic *pmic; + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + void __iomem *base; + + pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL); + if (!pmic) + return -ENOMEM; + pmic->dev = dev; + + pmic->res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!pmic->res) + return -ENOENT; + + base = devm_ioremap_resource(dev, pmic->res); + if (!base) + return -ENOMEM; + + pmic->regmap = devm_regmap_init_mmio_clk(dev, NULL, base, + &hi655x_regmap_config); + + regmap_read(pmic->regmap, HI655X_BUS_ADDR(HI655X_VER_REG), &pmic->ver); + if ((pmic->ver < PMU_VER_START) || (pmic->ver > PMU_VER_END)) { + dev_warn(dev, "PMU version %d unsupported\n", pmic->ver); + return -EINVAL; + } + + hi655x_local_irq_clear(pmic->regmap); + + pmic->gpio = of_get_named_gpio(np, "pmic-gpios", 0); + if (!gpio_is_valid(pmic->gpio)) { + dev_err(dev, "Failed to get the pmic-gpios\n"); + return -ENODEV; + } + + ret = devm_gpio_request_one(dev, pmic->gpio, GPIOF_IN, + "hi655x_pmic_irq"); + if (ret < 0) { + dev_err(dev, "Failed to request gpio %d ret = %d\n", + pmic->gpio, ret); + return ret; + } + + ret = regmap_add_irq_chip(pmic->regmap, gpio_to_irq(pmic->gpio), + IRQF_TRIGGER_LOW | IRQF_NO_SUSPEND, 0, + &hi655x_irq_chip, &pmic->irq_data); + if (ret) { + dev_err(dev, "Failed to obtain 'hi655x_pmic_irq' %d\n", ret); + return ret; + } + + platform_set_drvdata(pdev, pmic); + + ret = mfd_add_devices(dev, PLATFORM_DEVID_AUTO, hi655x_pmic_devs, + ARRAY_SIZE(hi655x_pmic_devs), NULL, 0, NULL); + if (ret) { + dev_err(dev, "Failed to register device %d\n", ret); + regmap_del_irq_chip(gpio_to_irq(pmic->gpio), pmic->irq_data); + return ret; + } + + return 0; +} + +static int hi655x_pmic_remove(struct platform_device *pdev) +{ + struct hi655x_pmic *pmic = platform_get_drvdata(pdev); + + regmap_del_irq_chip(gpio_to_irq(pmic->gpio), pmic->irq_data); + mfd_remove_devices(&pdev->dev); + return 0; +} + +static const struct of_device_id hi655x_pmic_match[] = { + { .compatible = "hisilicon,hi655x-pmic", }, + {}, +}; + +static struct platform_driver hi655x_pmic_driver = { + .driver = { + .name = "hi655x-pmic", + .of_match_table = of_match_ptr(hi655x_pmic_match), + }, + .probe = hi655x_pmic_probe, + .remove = hi655x_pmic_remove, +}; +module_platform_driver(hi655x_pmic_driver); + +MODULE_AUTHOR("Chen Feng <puck.chen@hisilicon.com>"); +MODULE_DESCRIPTION("Hisilicon hi655x PMIC driver"); +MODULE_LICENSE("GPL v2"); |