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Release 4.14 drivers/mfd/max77620.c

Directory: drivers/mfd
/*
 * Maxim MAX77620 MFD Driver
 *
 * Copyright (C) 2016 NVIDIA CORPORATION. All rights reserved.
 *
 * Author:
 *      Laxman Dewangan <ldewangan@nvidia.com>
 *      Chaitanya Bandi <bandik@nvidia.com>
 *      Mallikarjun Kasoju <mkasoju@nvidia.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.
 */

/****************** Teminology used in driver ********************
 * Here are some terminology used from datasheet for quick reference:
 * Flexible Power Sequence (FPS):
 * The Flexible Power Sequencer (FPS) allows each regulator to power up under
 * hardware or software control. Additionally, each regulator can power on
 * independently or among a group of other regulators with an adjustable
 * power-up and power-down delays (sequencing). GPIO1, GPIO2, and GPIO3 can
 * be programmed to be part of a sequence allowing external regulators to be
 * sequenced along with internal regulators. 32KHz clock can be programmed to
 * be part of a sequence.
 * There is 3 FPS confguration registers and all resources are configured to
 * any of these FPS or no FPS.
 */

#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/mfd/core.h>
#include <linux/mfd/max77620.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>


static const struct resource gpio_resources[] = {
	DEFINE_RES_IRQ(MAX77620_IRQ_TOP_GPIO),
};


static const struct resource power_resources[] = {
	DEFINE_RES_IRQ(MAX77620_IRQ_LBT_MBATLOW),
};


static const struct resource rtc_resources[] = {
	DEFINE_RES_IRQ(MAX77620_IRQ_TOP_RTC),
};


static const struct resource thermal_resources[] = {
	DEFINE_RES_IRQ(MAX77620_IRQ_LBT_TJALRM1),
	DEFINE_RES_IRQ(MAX77620_IRQ_LBT_TJALRM2),
};


static const struct regmap_irq max77620_top_irqs[] = {
	REGMAP_IRQ_REG(MAX77620_IRQ_TOP_GLBL, 0, MAX77620_IRQ_TOP_GLBL_MASK),
	REGMAP_IRQ_REG(MAX77620_IRQ_TOP_SD, 0, MAX77620_IRQ_TOP_SD_MASK),
	REGMAP_IRQ_REG(MAX77620_IRQ_TOP_LDO, 0, MAX77620_IRQ_TOP_LDO_MASK),
	REGMAP_IRQ_REG(MAX77620_IRQ_TOP_GPIO, 0, MAX77620_IRQ_TOP_GPIO_MASK),
	REGMAP_IRQ_REG(MAX77620_IRQ_TOP_RTC, 0, MAX77620_IRQ_TOP_RTC_MASK),
	REGMAP_IRQ_REG(MAX77620_IRQ_TOP_32K, 0, MAX77620_IRQ_TOP_32K_MASK),
	REGMAP_IRQ_REG(MAX77620_IRQ_TOP_ONOFF, 0, MAX77620_IRQ_TOP_ONOFF_MASK),
	REGMAP_IRQ_REG(MAX77620_IRQ_LBT_MBATLOW, 1, MAX77620_IRQ_LBM_MASK),
	REGMAP_IRQ_REG(MAX77620_IRQ_LBT_TJALRM1, 1, MAX77620_IRQ_TJALRM1_MASK),
	REGMAP_IRQ_REG(MAX77620_IRQ_LBT_TJALRM2, 1, MAX77620_IRQ_TJALRM2_MASK),
};


static const struct mfd_cell max77620_children[] = {
	{ .name = "max77620-pinctrl", },
	{ .name = "max77620-clock", },
	{ .name = "max77620-pmic", },
	{ .name = "max77620-watchdog", },
	{
		.name = "max77620-gpio",
		.resources = gpio_resources,
		.num_resources = ARRAY_SIZE(gpio_resources),
        }, {
		.name = "max77620-rtc",
		.resources = rtc_resources,
		.num_resources = ARRAY_SIZE(rtc_resources),
        }, {
		.name = "max77620-power",
		.resources = power_resources,
		.num_resources = ARRAY_SIZE(power_resources),
        }, {
		.name = "max77620-thermal",
		.resources = thermal_resources,
		.num_resources = ARRAY_SIZE(thermal_resources),
        },
};


static const struct mfd_cell max20024_children[] = {
	{ .name = "max20024-pinctrl", },
	{ .name = "max77620-clock", },
	{ .name = "max20024-pmic", },
	{ .name = "max77620-watchdog", },
	{
		.name = "max77620-gpio",
		.resources = gpio_resources,
		.num_resources = ARRAY_SIZE(gpio_resources),
        }, {
		.name = "max77620-rtc",
		.resources = rtc_resources,
		.num_resources = ARRAY_SIZE(rtc_resources),
        }, {
		.name = "max20024-power",
		.resources = power_resources,
		.num_resources = ARRAY_SIZE(power_resources),
        },
};


static const struct regmap_range max77620_readable_ranges[] = {
	regmap_reg_range(MAX77620_REG_CNFGGLBL1, MAX77620_REG_DVSSD4),
};


static const struct regmap_access_table max77620_readable_table = {
	.yes_ranges = max77620_readable_ranges,
	.n_yes_ranges = ARRAY_SIZE(max77620_readable_ranges),
};


static const struct regmap_range max20024_readable_ranges[] = {
	regmap_reg_range(MAX77620_REG_CNFGGLBL1, MAX77620_REG_DVSSD4),
	regmap_reg_range(MAX20024_REG_MAX_ADD, MAX20024_REG_MAX_ADD),
};


static const struct regmap_access_table max20024_readable_table = {
	.yes_ranges = max20024_readable_ranges,
	.n_yes_ranges = ARRAY_SIZE(max20024_readable_ranges),
};


static const struct regmap_range max77620_writable_ranges[] = {
	regmap_reg_range(MAX77620_REG_CNFGGLBL1, MAX77620_REG_DVSSD4),
};


static const struct regmap_access_table max77620_writable_table = {
	.yes_ranges = max77620_writable_ranges,
	.n_yes_ranges = ARRAY_SIZE(max77620_writable_ranges),
};


static const struct regmap_range max77620_cacheable_ranges[] = {
	regmap_reg_range(MAX77620_REG_SD0_CFG, MAX77620_REG_LDO_CFG3),
	regmap_reg_range(MAX77620_REG_FPS_CFG0, MAX77620_REG_FPS_SD3),
};


static const struct regmap_access_table max77620_volatile_table = {
	.no_ranges = max77620_cacheable_ranges,
	.n_no_ranges = ARRAY_SIZE(max77620_cacheable_ranges),
};


static const struct regmap_config max77620_regmap_config = {
	.name = "power-slave",
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = MAX77620_REG_DVSSD4 + 1,
	.cache_type = REGCACHE_RBTREE,
	.rd_table = &max77620_readable_table,
	.wr_table = &max77620_writable_table,
	.volatile_table = &max77620_volatile_table,
};


static const struct regmap_config max20024_regmap_config = {
	.name = "power-slave",
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = MAX20024_REG_MAX_ADD + 1,
	.cache_type = REGCACHE_RBTREE,
	.rd_table = &max20024_readable_table,
	.wr_table = &max77620_writable_table,
	.volatile_table = &max77620_volatile_table,
};

/*
 * MAX77620 and MAX20024 has the following steps of the interrupt handling
 * for TOP interrupts:
 * 1. When interrupt occurs from PMIC, mask the PMIC interrupt by setting GLBLM.
 * 2. Read IRQTOP and service the interrupt.
 * 3. Once all interrupts has been checked and serviced, the interrupt service
 *    routine un-masks the hardware interrupt line by clearing GLBLM.
 */

static int max77620_irq_global_mask(void *irq_drv_data) { struct max77620_chip *chip = irq_drv_data; int ret; ret = regmap_update_bits(chip->rmap, MAX77620_REG_INTENLBT, MAX77620_GLBLM_MASK, MAX77620_GLBLM_MASK); if (ret < 0) dev_err(chip->dev, "Failed to set GLBLM: %d\n", ret); return ret; }

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static int max77620_irq_global_unmask(void *irq_drv_data) { struct max77620_chip *chip = irq_drv_data; int ret; ret = regmap_update_bits(chip->rmap, MAX77620_REG_INTENLBT, MAX77620_GLBLM_MASK, 0); if (ret < 0) dev_err(chip->dev, "Failed to reset GLBLM: %d\n", ret); return ret; }

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static struct regmap_irq_chip max77620_top_irq_chip = { .name = "max77620-top", .irqs = max77620_top_irqs, .num_irqs = ARRAY_SIZE(max77620_top_irqs), .num_regs = 2, .status_base = MAX77620_REG_IRQTOP, .mask_base = MAX77620_REG_IRQTOPM, .handle_pre_irq = max77620_irq_global_mask, .handle_post_irq = max77620_irq_global_unmask, }; /* max77620_get_fps_period_reg_value: Get FPS bit field value from * requested periods. * MAX77620 supports the FPS period of 40, 80, 160, 320, 540, 1280, 2560 * and 5120 microseconds. MAX20024 supports the FPS period of 20, 40, 80, * 160, 320, 540, 1280 and 2560 microseconds. * The FPS register has 3 bits field to set the FPS period as * bits max77620 max20024 * 000 40 20 * 001 80 40 * ::: */
static int max77620_get_fps_period_reg_value(struct max77620_chip *chip, int tperiod) { int fps_min_period; int i; switch (chip->chip_id) { case MAX20024: fps_min_period = MAX20024_FPS_PERIOD_MIN_US; break; case MAX77620: fps_min_period = MAX77620_FPS_PERIOD_MIN_US; break; default: return -EINVAL; } for (i = 0; i < 7; i++) { if (fps_min_period >= tperiod) return i; fps_min_period *= 2; } return i; }

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/* max77620_config_fps: Configure FPS configuration registers * based on platform specific information. */
static int max77620_config_fps(struct max77620_chip *chip, struct device_node *fps_np) { struct device *dev = chip->dev; unsigned int mask = 0, config = 0; u32 fps_max_period; u32 param_val; int tperiod, fps_id; int ret; char fps_name[10]; switch (chip->chip_id) { case MAX20024: fps_max_period = MAX20024_FPS_PERIOD_MAX_US; break; case MAX77620: fps_max_period = MAX77620_FPS_PERIOD_MAX_US; break; default: return -EINVAL; } for (fps_id = 0; fps_id < MAX77620_FPS_COUNT; fps_id++) { sprintf(fps_name, "fps%d", fps_id); if (!strcmp(fps_np->name, fps_name)) break; } if (fps_id == MAX77620_FPS_COUNT) { dev_err(dev, "FPS node name %s is not valid\n", fps_np->name); return -EINVAL; } ret = of_property_read_u32(fps_np, "maxim,shutdown-fps-time-period-us", &param_val); if (!ret) { mask |= MAX77620_FPS_TIME_PERIOD_MASK; chip->shutdown_fps_period[fps_id] = min(param_val, fps_max_period); tperiod = max77620_get_fps_period_reg_value(chip, chip->shutdown_fps_period[fps_id]); config |= tperiod << MAX77620_FPS_TIME_PERIOD_SHIFT; } ret = of_property_read_u32(fps_np, "maxim,suspend-fps-time-period-us", &param_val); if (!ret) chip->suspend_fps_period[fps_id] = min(param_val, fps_max_period); ret = of_property_read_u32(fps_np, "maxim,fps-event-source", &param_val); if (!ret) { if (param_val > 2) { dev_err(dev, "FPS%d event-source invalid\n", fps_id); return -EINVAL; } mask |= MAX77620_FPS_EN_SRC_MASK; config |= param_val << MAX77620_FPS_EN_SRC_SHIFT; if (param_val == 2) { mask |= MAX77620_FPS_ENFPS_SW_MASK; config |= MAX77620_FPS_ENFPS_SW; } } if (!chip->sleep_enable && !chip->enable_global_lpm) { ret = of_property_read_u32(fps_np, "maxim,device-state-on-disabled-event", &param_val); if (!ret) { if (param_val == 0) chip->sleep_enable = true; else if (param_val == 1) chip->enable_global_lpm = true; } } ret = regmap_update_bits(chip->rmap, MAX77620_REG_FPS_CFG0 + fps_id, mask, config); if (ret < 0) { dev_err(dev, "Failed to update FPS CFG: %d\n", ret); return ret; } return 0; }

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static int max77620_initialise_fps(struct max77620_chip *chip) { struct device *dev = chip->dev; struct device_node *fps_np, *fps_child; u8 config; int fps_id; int ret; for (fps_id = 0; fps_id < MAX77620_FPS_COUNT; fps_id++) { chip->shutdown_fps_period[fps_id] = -1; chip->suspend_fps_period[fps_id] = -1; } fps_np = of_get_child_by_name(dev->of_node, "fps"); if (!fps_np) goto skip_fps; for_each_child_of_node(fps_np, fps_child) { ret = max77620_config_fps(chip, fps_child); if (ret < 0) return ret; } config = chip->enable_global_lpm ? MAX77620_ONOFFCNFG2_SLP_LPM_MSK : 0; ret = regmap_update_bits(chip->rmap, MAX77620_REG_ONOFFCNFG2, MAX77620_ONOFFCNFG2_SLP_LPM_MSK, config); if (ret < 0) { dev_err(dev, "Failed to update SLP_LPM: %d\n", ret); return ret; } skip_fps: /* Enable wake on EN0 pin */ ret = regmap_update_bits(chip->rmap, MAX77620_REG_ONOFFCNFG2, MAX77620_ONOFFCNFG2_WK_EN0, MAX77620_ONOFFCNFG2_WK_EN0); if (ret < 0) { dev_err(dev, "Failed to update WK_EN0: %d\n", ret); return ret; } /* For MAX20024, SLPEN will be POR reset if CLRSE is b11 */ if ((chip->chip_id == MAX20024) && chip->sleep_enable) { config = MAX77620_ONOFFCNFG1_SLPEN | MAX20024_ONOFFCNFG1_CLRSE; ret = regmap_update_bits(chip->rmap, MAX77620_REG_ONOFFCNFG1, config, config); if (ret < 0) { dev_err(dev, "Failed to update SLPEN: %d\n", ret); return ret; } } return 0; }

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static int max77620_read_es_version(struct max77620_chip *chip) { unsigned int val; u8 cid_val[6]; int i; int ret; for (i = MAX77620_REG_CID0; i <= MAX77620_REG_CID5; i++) { ret = regmap_read(chip->rmap, i, &val); if (ret < 0) { dev_err(chip->dev, "Failed to read CID: %d\n", ret); return ret; } dev_dbg(chip->dev, "CID%d: 0x%02x\n", i - MAX77620_REG_CID0, val); cid_val[i - MAX77620_REG_CID0] = val; } /* CID4 is OTP Version and CID5 is ES version */ dev_info(chip->dev, "PMIC Version OTP:0x%02X and ES:0x%X\n", cid_val[4], MAX77620_CID5_DIDM(cid_val[5])); return ret; }

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static int max77620_probe(struct i2c_client *client, const struct i2c_device_id *id) { const struct regmap_config *rmap_config; struct max77620_chip *chip; const struct mfd_cell *mfd_cells; int n_mfd_cells; int ret; chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL); if (!chip) return -ENOMEM; i2c_set_clientdata(client, chip); chip->dev = &client->dev; chip->irq_base = -1; chip->chip_irq = client->irq; chip->chip_id = (enum max77620_chip_id)id->driver_data; switch (chip->chip_id) { case MAX77620: mfd_cells = max77620_children; n_mfd_cells = ARRAY_SIZE(max77620_children); rmap_config = &max77620_regmap_config; break; case MAX20024: mfd_cells = max20024_children; n_mfd_cells = ARRAY_SIZE(max20024_children); rmap_config = &max20024_regmap_config; break; default: dev_err(chip->dev, "ChipID is invalid %d\n", chip->chip_id); return -EINVAL; } chip->rmap = devm_regmap_init_i2c(client, rmap_config); if (IS_ERR(chip->rmap)) { ret = PTR_ERR(chip->rmap); dev_err(chip->dev, "Failed to initialise regmap: %d\n", ret); return ret; } ret = max77620_read_es_version(chip); if (ret < 0) return ret; max77620_top_irq_chip.irq_drv_data = chip; ret = devm_regmap_add_irq_chip(chip->dev, chip->rmap, client->irq, IRQF_ONESHOT | IRQF_SHARED, chip->irq_base, &max77620_top_irq_chip, &chip->top_irq_data); if (ret < 0) { dev_err(chip->dev, "Failed to add regmap irq: %d\n", ret); return ret; } ret = max77620_initialise_fps(chip); if (ret < 0) return ret; ret = devm_mfd_add_devices(chip->dev, PLATFORM_DEVID_NONE, mfd_cells, n_mfd_cells, NULL, 0, regmap_irq_get_domain(chip->top_irq_data)); if (ret < 0) { dev_err(chip->dev, "Failed to add MFD children: %d\n", ret); return ret; } return 0; }

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#ifdef CONFIG_PM_SLEEP
static int max77620_set_fps_period(struct max77620_chip *chip, int fps_id, int time_period) { int period = max77620_get_fps_period_reg_value(chip, time_period); int ret; ret = regmap_update_bits(chip->rmap, MAX77620_REG_FPS_CFG0 + fps_id, MAX77620_FPS_TIME_PERIOD_MASK, period << MAX77620_FPS_TIME_PERIOD_SHIFT); if (ret < 0) { dev_err(chip->dev, "Failed to update FPS period: %d\n", ret); return ret; } return 0; }

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static int max77620_i2c_suspend(struct device *dev) { struct max77620_chip *chip = dev_get_drvdata(dev); struct i2c_client *client = to_i2c_client(dev); unsigned int config; int fps; int ret; for (fps = 0; fps < MAX77620_FPS_COUNT; fps++) { if (chip->suspend_fps_period[fps] < 0) continue; ret = max77620_set_fps_period(chip, fps, chip->suspend_fps_period[fps]); if (ret < 0) return ret; } /* * For MAX20024: No need to configure SLPEN on suspend as * it will be configured on Init. */ if (chip->chip_id == MAX20024) goto out; config = (chip->sleep_enable) ? MAX77620_ONOFFCNFG1_SLPEN : 0; ret = regmap_update_bits(chip->rmap, MAX77620_REG_ONOFFCNFG1, MAX77620_ONOFFCNFG1_SLPEN, config); if (ret < 0) { dev_err(dev, "Failed to configure sleep in suspend: %d\n", ret); return ret; } /* Disable WK_EN0 */ ret = regmap_update_bits(chip->rmap, MAX77620_REG_ONOFFCNFG2, MAX77620_ONOFFCNFG2_WK_EN0, 0); if (ret < 0) { dev_err(dev, "Failed to configure WK_EN in suspend: %d\n", ret); return ret; } out: disable_irq(client->irq); return 0; }

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static int max77620_i2c_resume(struct device *dev) { struct max77620_chip *chip = dev_get_drvdata(dev); struct i2c_client *client = to_i2c_client(dev); int ret; int fps; for (fps = 0; fps < MAX77620_FPS_COUNT; fps++) { if (chip->shutdown_fps_period[fps] < 0) continue; ret = max77620_set_fps_period(chip, fps, chip->shutdown_fps_period[fps]); if (ret < 0) return ret; } /* * For MAX20024: No need to configure WKEN0 on resume as * it is configured on Init. */ if (chip->chip_id == MAX20024) goto out; /* Enable WK_EN0 */ ret = regmap_update_bits(chip->rmap, MAX77620_REG_ONOFFCNFG2, MAX77620_ONOFFCNFG2_WK_EN0, MAX77620_ONOFFCNFG2_WK_EN0); if (ret < 0) { dev_err(dev, "Failed to configure WK_EN0 n resume: %d\n", ret); return ret; } out: enable_irq(client->irq); return 0; }

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#endif static const struct i2c_device_id max77620_id[] = { {"max77620", MAX77620}, {"max20024", MAX20024}, {}, }; static const struct dev_pm_ops max77620_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(max77620_i2c_suspend, max77620_i2c_resume) }; static struct i2c_driver max77620_driver = { .driver = { .name = "max77620", .pm = &max77620_pm_ops, }, .probe = max77620_probe, .id_table = max77620_id, }; builtin_i2c_driver(max77620_driver);

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Directory: drivers/mfd
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