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Release 4.14 drivers/rtc/rtc-ac100.c

Directory: drivers/rtc
/*
 * RTC Driver for X-Powers AC100
 *
 * Copyright (c) 2016 Chen-Yu Tsai
 *
 * Chen-Yu Tsai <wens@csie.org>
 *
 * 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/bcd.h>
#include <linux/clk-provider.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mfd/ac100.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/rtc.h>
#include <linux/types.h>

/* Control register */

#define AC100_RTC_CTRL_24HOUR	BIT(0)

/* Clock output register bits */

#define AC100_CLKOUT_PRE_DIV_SHIFT	5

#define AC100_CLKOUT_PRE_DIV_WIDTH	3

#define AC100_CLKOUT_MUX_SHIFT		4

#define AC100_CLKOUT_MUX_WIDTH		1

#define AC100_CLKOUT_DIV_SHIFT		1

#define AC100_CLKOUT_DIV_WIDTH		3

#define AC100_CLKOUT_EN			BIT(0)

/* RTC */

#define AC100_RTC_SEC_MASK	GENMASK(6, 0)

#define AC100_RTC_MIN_MASK	GENMASK(6, 0)

#define AC100_RTC_HOU_MASK	GENMASK(5, 0)

#define AC100_RTC_WEE_MASK	GENMASK(2, 0)

#define AC100_RTC_DAY_MASK	GENMASK(5, 0)

#define AC100_RTC_MON_MASK	GENMASK(4, 0)

#define AC100_RTC_YEA_MASK	GENMASK(7, 0)

#define AC100_RTC_YEA_LEAP	BIT(15)

#define AC100_RTC_UPD_TRIGGER	BIT(15)

/* Alarm (wall clock) */

#define AC100_ALM_INT_ENABLE	BIT(0)


#define AC100_ALM_SEC_MASK	GENMASK(6, 0)

#define AC100_ALM_MIN_MASK	GENMASK(6, 0)

#define AC100_ALM_HOU_MASK	GENMASK(5, 0)

#define AC100_ALM_WEE_MASK	GENMASK(2, 0)

#define AC100_ALM_DAY_MASK	GENMASK(5, 0)

#define AC100_ALM_MON_MASK	GENMASK(4, 0)

#define AC100_ALM_YEA_MASK	GENMASK(7, 0)

#define AC100_ALM_ENABLE_FLAG	BIT(15)

#define AC100_ALM_UPD_TRIGGER	BIT(15)

/*
 * The year parameter passed to the driver is usually an offset relative to
 * the year 1900. This macro is used to convert this offset to another one
 * relative to the minimum year allowed by the hardware.
 *
 * The year range is 1970 - 2069. This range is selected to match Allwinner's
 * driver.
 */

#define AC100_YEAR_MIN				1970

#define AC100_YEAR_MAX				2069

#define AC100_YEAR_OFF				(AC100_YEAR_MIN - 1900)


struct ac100_clkout {
	
struct clk_hw hw;
	
struct regmap *regmap;
	
u8 offset;
};


#define to_ac100_clkout(_hw) container_of(_hw, struct ac100_clkout, hw)


#define AC100_RTC_32K_NAME	"ac100-rtc-32k"

#define AC100_RTC_32K_RATE	32768

#define AC100_CLKOUT_NUM	3


static const char * const ac100_clkout_names[AC100_CLKOUT_NUM] = {
	"ac100-cko1-rtc",
	"ac100-cko2-rtc",
	"ac100-cko3-rtc",
};


struct ac100_rtc_dev {
	
struct rtc_device *rtc;
	
struct device *dev;
	
struct regmap *regmap;
	
int irq;
	
unsigned long alarm;

	
struct clk_hw *rtc_32k_clk;
	
struct ac100_clkout clks[AC100_CLKOUT_NUM];
	
struct clk_hw_onecell_data *clk_data;
};

/**
 * Clock controls for 3 clock output pins
 */


static const struct clk_div_table ac100_clkout_prediv[] = {
	{ .val = 0, .div = 1 },
	{ .val = 1, .div = 2 },
	{ .val = 2, .div = 4 },
	{ .val = 3, .div = 8 },
	{ .val = 4, .div = 16 },
	{ .val = 5, .div = 32 },
	{ .val = 6, .div = 64 },
	{ .val = 7, .div = 122 },
	{ },
};

/* Abuse the fact that one parent is 32768 Hz, and the other is 4 MHz */

static unsigned long ac100_clkout_recalc_rate(struct clk_hw *hw, unsigned long prate) { struct ac100_clkout *clk = to_ac100_clkout(hw); unsigned int reg, div; regmap_read(clk->regmap, clk->offset, &reg); /* Handle pre-divider first */ if (prate != AC100_RTC_32K_RATE) { div = (reg >> AC100_CLKOUT_PRE_DIV_SHIFT) & ((1 << AC100_CLKOUT_PRE_DIV_WIDTH) - 1); prate = divider_recalc_rate(hw, prate, div, ac100_clkout_prediv, 0); } div = (reg >> AC100_CLKOUT_DIV_SHIFT) & (BIT(AC100_CLKOUT_DIV_WIDTH) - 1); return divider_recalc_rate(hw, prate, div, NULL, CLK_DIVIDER_POWER_OF_TWO); }

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static long ac100_clkout_round_rate(struct clk_hw *hw, unsigned long rate, unsigned long prate) { unsigned long best_rate = 0, tmp_rate, tmp_prate; int i; if (prate == AC100_RTC_32K_RATE) return divider_round_rate(hw, rate, &prate, NULL, AC100_CLKOUT_DIV_WIDTH, CLK_DIVIDER_POWER_OF_TWO); for (i = 0; ac100_clkout_prediv[i].div; i++) { tmp_prate = DIV_ROUND_UP(prate, ac100_clkout_prediv[i].val); tmp_rate = divider_round_rate(hw, rate, &tmp_prate, NULL, AC100_CLKOUT_DIV_WIDTH, CLK_DIVIDER_POWER_OF_TWO); if (tmp_rate > rate) continue; if (rate - tmp_rate < best_rate - tmp_rate) best_rate = tmp_rate; } return best_rate; }

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static int ac100_clkout_determine_rate(struct clk_hw *hw, struct clk_rate_request *req) { struct clk_hw *best_parent; unsigned long best = 0; int i, num_parents = clk_hw_get_num_parents(hw); for (i = 0; i < num_parents; i++) { struct clk_hw *parent = clk_hw_get_parent_by_index(hw, i); unsigned long tmp, prate = clk_hw_get_rate(parent); tmp = ac100_clkout_round_rate(hw, req->rate, prate); if (tmp > req->rate) continue; if (req->rate - tmp < req->rate - best) { best = tmp; best_parent = parent; } } if (!best) return -EINVAL; req->best_parent_hw = best_parent; req->best_parent_rate = best; req->rate = best; return 0; }

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static int ac100_clkout_set_rate(struct clk_hw *hw, unsigned long rate, unsigned long prate) { struct ac100_clkout *clk = to_ac100_clkout(hw); int div = 0, pre_div = 0; do { div = divider_get_val(rate * ac100_clkout_prediv[pre_div].div, prate, NULL, AC100_CLKOUT_DIV_WIDTH, CLK_DIVIDER_POWER_OF_TWO); if (div >= 0) break; } while (prate != AC100_RTC_32K_RATE && ac100_clkout_prediv[++pre_div].div); if (div < 0) return div; pre_div = ac100_clkout_prediv[pre_div].val; regmap_update_bits(clk->regmap, clk->offset, ((1 << AC100_CLKOUT_DIV_WIDTH) - 1) << AC100_CLKOUT_DIV_SHIFT | ((1 << AC100_CLKOUT_PRE_DIV_WIDTH) - 1) << AC100_CLKOUT_PRE_DIV_SHIFT, (div - 1) << AC100_CLKOUT_DIV_SHIFT | (pre_div - 1) << AC100_CLKOUT_PRE_DIV_SHIFT); return 0; }

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static int ac100_clkout_prepare(struct clk_hw *hw) { struct ac100_clkout *clk = to_ac100_clkout(hw); return regmap_update_bits(clk->regmap, clk->offset, AC100_CLKOUT_EN, AC100_CLKOUT_EN); }

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static void ac100_clkout_unprepare(struct clk_hw *hw) { struct ac100_clkout *clk = to_ac100_clkout(hw); regmap_update_bits(clk->regmap, clk->offset, AC100_CLKOUT_EN, 0); }

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static int ac100_clkout_is_prepared(struct clk_hw *hw) { struct ac100_clkout *clk = to_ac100_clkout(hw); unsigned int reg; regmap_read(clk->regmap, clk->offset, &reg); return reg & AC100_CLKOUT_EN; }

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static u8 ac100_clkout_get_parent(struct clk_hw *hw) { struct ac100_clkout *clk = to_ac100_clkout(hw); unsigned int reg; regmap_read(clk->regmap, clk->offset, &reg); return (reg >> AC100_CLKOUT_MUX_SHIFT) & 0x1; }

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static int ac100_clkout_set_parent(struct clk_hw *hw, u8 index) { struct ac100_clkout *clk = to_ac100_clkout(hw); return regmap_update_bits(clk->regmap, clk->offset, BIT(AC100_CLKOUT_MUX_SHIFT), index ? BIT(AC100_CLKOUT_MUX_SHIFT) : 0); }

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static const struct clk_ops ac100_clkout_ops = { .prepare = ac100_clkout_prepare, .unprepare = ac100_clkout_unprepare, .is_prepared = ac100_clkout_is_prepared, .recalc_rate = ac100_clkout_recalc_rate, .determine_rate = ac100_clkout_determine_rate, .get_parent = ac100_clkout_get_parent, .set_parent = ac100_clkout_set_parent, .set_rate = ac100_clkout_set_rate, };
static int ac100_rtc_register_clks(struct ac100_rtc_dev *chip) { struct device_node *np = chip->dev->of_node; const char *parents[2] = {AC100_RTC_32K_NAME}; int i, ret; chip->clk_data = devm_kzalloc(chip->dev, sizeof(*chip->clk_data) + sizeof(*chip->clk_data->hws) * AC100_CLKOUT_NUM, GFP_KERNEL); if (!chip->clk_data) return -ENOMEM; chip->rtc_32k_clk = clk_hw_register_fixed_rate(chip->dev, AC100_RTC_32K_NAME, NULL, 0, AC100_RTC_32K_RATE); if (IS_ERR(chip->rtc_32k_clk)) { ret = PTR_ERR(chip->rtc_32k_clk); dev_err(chip->dev, "Failed to register RTC-32k clock: %d\n", ret); return ret; } parents[1] = of_clk_get_parent_name(np, 0); if (!parents[1]) { dev_err(chip->dev, "Failed to get ADDA 4M clock\n"); return -EINVAL; } for (i = 0; i < AC100_CLKOUT_NUM; i++) { struct ac100_clkout *clk = &chip->clks[i]; struct clk_init_data init = { .name = ac100_clkout_names[i], .ops = &ac100_clkout_ops, .parent_names = parents, .num_parents = ARRAY_SIZE(parents), .flags = 0, }; of_property_read_string_index(np, "clock-output-names", i, &init.name); clk->regmap = chip->regmap; clk->offset = AC100_CLKOUT_CTRL1 + i; clk->hw.init = &init; ret = devm_clk_hw_register(chip->dev, &clk->hw); if (ret) { dev_err(chip->dev, "Failed to register clk '%s': %d\n", init.name, ret); goto err_unregister_rtc_32k; } chip->clk_data->hws[i] = &clk->hw; } chip->clk_data->num = i; ret = of_clk_add_hw_provider(np, of_clk_hw_onecell_get, chip->clk_data); if (ret) goto err_unregister_rtc_32k; return 0; err_unregister_rtc_32k: clk_unregister_fixed_rate(chip->rtc_32k_clk->clk); return ret; }

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static void ac100_rtc_unregister_clks(struct ac100_rtc_dev *chip) { of_clk_del_provider(chip->dev->of_node); clk_unregister_fixed_rate(chip->rtc_32k_clk->clk); }

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/** * RTC related bits */
static int ac100_rtc_get_time(struct device *dev, struct rtc_time *rtc_tm) { struct ac100_rtc_dev *chip = dev_get_drvdata(dev); struct regmap *regmap = chip->regmap; u16 reg[7]; int ret; ret = regmap_bulk_read(regmap, AC100_RTC_SEC, reg, 7); if (ret) return ret; rtc_tm->tm_sec = bcd2bin(reg[0] & AC100_RTC_SEC_MASK); rtc_tm->tm_min = bcd2bin(reg[1] & AC100_RTC_MIN_MASK); rtc_tm->tm_hour = bcd2bin(reg[2] & AC100_RTC_HOU_MASK); rtc_tm->tm_wday = bcd2bin(reg[3] & AC100_RTC_WEE_MASK); rtc_tm->tm_mday = bcd2bin(reg[4] & AC100_RTC_DAY_MASK); rtc_tm->tm_mon = bcd2bin(reg[5] & AC100_RTC_MON_MASK) - 1; rtc_tm->tm_year = bcd2bin(reg[6] & AC100_RTC_YEA_MASK) + AC100_YEAR_OFF; return rtc_valid_tm(rtc_tm); }

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static int ac100_rtc_set_time(struct device *dev, struct rtc_time *rtc_tm) { struct ac100_rtc_dev *chip = dev_get_drvdata(dev); struct regmap *regmap = chip->regmap; int year; u16 reg[8]; /* our RTC has a limited year range... */ year = rtc_tm->tm_year - AC100_YEAR_OFF; if (year < 0 || year > (AC100_YEAR_MAX - 1900)) { dev_err(dev, "rtc only supports year in range %d - %d\n", AC100_YEAR_MIN, AC100_YEAR_MAX); return -EINVAL; } /* convert to BCD */ reg[0] = bin2bcd(rtc_tm->tm_sec) & AC100_RTC_SEC_MASK; reg[1] = bin2bcd(rtc_tm->tm_min) & AC100_RTC_MIN_MASK; reg[2] = bin2bcd(rtc_tm->tm_hour) & AC100_RTC_HOU_MASK; reg[3] = bin2bcd(rtc_tm->tm_wday) & AC100_RTC_WEE_MASK; reg[4] = bin2bcd(rtc_tm->tm_mday) & AC100_RTC_DAY_MASK; reg[5] = bin2bcd(rtc_tm->tm_mon + 1) & AC100_RTC_MON_MASK; reg[6] = bin2bcd(year) & AC100_RTC_YEA_MASK; /* trigger write */ reg[7] = AC100_RTC_UPD_TRIGGER; /* Is it a leap year? */ if (is_leap_year(year + AC100_YEAR_OFF + 1900)) reg[6] |= AC100_RTC_YEA_LEAP; return regmap_bulk_write(regmap, AC100_RTC_SEC, reg, 8); }

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static int ac100_rtc_alarm_irq_enable(struct device *dev, unsigned int en) { struct ac100_rtc_dev *chip = dev_get_drvdata(dev); struct regmap *regmap = chip->regmap; unsigned int val; val = en ? AC100_ALM_INT_ENABLE : 0; return regmap_write(regmap, AC100_ALM_INT_ENA, val); }

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static int ac100_rtc_get_alarm(struct device *dev, struct rtc_wkalrm *alrm) { struct ac100_rtc_dev *chip = dev_get_drvdata(dev); struct regmap *regmap = chip->regmap; struct rtc_time *alrm_tm = &alrm->time; u16 reg[7]; unsigned int val; int ret; ret = regmap_read(regmap, AC100_ALM_INT_ENA, &val); if (ret) return ret; alrm->enabled = !!(val & AC100_ALM_INT_ENABLE); ret = regmap_bulk_read(regmap, AC100_ALM_SEC, reg, 7); if (ret) return ret; alrm_tm->tm_sec = bcd2bin(reg[0] & AC100_ALM_SEC_MASK); alrm_tm->tm_min = bcd2bin(reg[1] & AC100_ALM_MIN_MASK); alrm_tm->tm_hour = bcd2bin(reg[2] & AC100_ALM_HOU_MASK); alrm_tm->tm_wday = bcd2bin(reg[3] & AC100_ALM_WEE_MASK); alrm_tm->tm_mday = bcd2bin(reg[4] & AC100_ALM_DAY_MASK); alrm_tm->tm_mon = bcd2bin(reg[5] & AC100_ALM_MON_MASK) - 1; alrm_tm->tm_year = bcd2bin(reg[6] & AC100_ALM_YEA_MASK) + AC100_YEAR_OFF; return 0; }

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static int ac100_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) { struct ac100_rtc_dev *chip = dev_get_drvdata(dev); struct regmap *regmap = chip->regmap; struct rtc_time *alrm_tm = &alrm->time; u16 reg[8]; int year; int ret; /* our alarm has a limited year range... */ year = alrm_tm->tm_year - AC100_YEAR_OFF; if (year < 0 || year > (AC100_YEAR_MAX - 1900)) { dev_err(dev, "alarm only supports year in range %d - %d\n", AC100_YEAR_MIN, AC100_YEAR_MAX); return -EINVAL; } /* convert to BCD */ reg[0] = (bin2bcd(alrm_tm->tm_sec) & AC100_ALM_SEC_MASK) | AC100_ALM_ENABLE_FLAG; reg[1] = (bin2bcd(alrm_tm->tm_min) & AC100_ALM_MIN_MASK) | AC100_ALM_ENABLE_FLAG; reg[2] = (bin2bcd(alrm_tm->tm_hour) & AC100_ALM_HOU_MASK) | AC100_ALM_ENABLE_FLAG; /* Do not enable weekday alarm */ reg[3] = bin2bcd(alrm_tm->tm_wday) & AC100_ALM_WEE_MASK; reg[4] = (bin2bcd(alrm_tm->tm_mday) & AC100_ALM_DAY_MASK) | AC100_ALM_ENABLE_FLAG; reg[5] = (bin2bcd(alrm_tm->tm_mon + 1) & AC100_ALM_MON_MASK) | AC100_ALM_ENABLE_FLAG; reg[6] = (bin2bcd(year) & AC100_ALM_YEA_MASK) | AC100_ALM_ENABLE_FLAG; /* trigger write */ reg[7] = AC100_ALM_UPD_TRIGGER; ret = regmap_bulk_write(regmap, AC100_ALM_SEC, reg, 8); if (ret) return ret; return ac100_rtc_alarm_irq_enable(dev, alrm->enabled); }

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static irqreturn_t ac100_rtc_irq(int irq, void *data) { struct ac100_rtc_dev *chip = data; struct regmap *regmap = chip->regmap; unsigned int val = 0; int ret; mutex_lock(&chip->rtc->ops_lock); /* read status */ ret = regmap_read(regmap, AC100_ALM_INT_STA, &val); if (ret) goto out; if (val & AC100_ALM_INT_ENABLE) { /* signal rtc framework */ rtc_update_irq(chip->rtc, 1, RTC_AF | RTC_IRQF); /* clear status */ ret = regmap_write(regmap, AC100_ALM_INT_STA, val); if (ret) goto out; /* disable interrupt */ ret = ac100_rtc_alarm_irq_enable(chip->dev, 0); if (ret) goto out; } out: mutex_unlock(&chip->rtc->ops_lock); return IRQ_HANDLED; }

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static const struct rtc_class_ops ac100_rtc_ops = { .read_time = ac100_rtc_get_time, .set_time = ac100_rtc_set_time, .read_alarm = ac100_rtc_get_alarm, .set_alarm = ac100_rtc_set_alarm, .alarm_irq_enable = ac100_rtc_alarm_irq_enable, };
static int ac100_rtc_probe(struct platform_device *pdev) { struct ac100_dev *ac100 = dev_get_drvdata(pdev->dev.parent); struct ac100_rtc_dev *chip; int ret; chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL); if (!chip) return -ENOMEM; platform_set_drvdata(pdev, chip); chip->dev = &pdev->dev; chip->regmap = ac100->regmap; chip->irq = platform_get_irq(pdev, 0); if (chip->irq < 0) { dev_err(&pdev->dev, "No IRQ resource\n"); return chip->irq; } ret = devm_request_threaded_irq(&pdev->dev, chip->irq, NULL, ac100_rtc_irq, IRQF_SHARED | IRQF_ONESHOT, dev_name(&pdev->dev), chip); if (ret) { dev_err(&pdev->dev, "Could not request IRQ\n"); return ret; } /* always use 24 hour mode */ regmap_write_bits(chip->regmap, AC100_RTC_CTRL, AC100_RTC_CTRL_24HOUR, AC100_RTC_CTRL_24HOUR); /* disable counter alarm interrupt */ regmap_write(chip->regmap, AC100_ALM_INT_ENA, 0); /* clear counter alarm pending interrupts */ regmap_write(chip->regmap, AC100_ALM_INT_STA, AC100_ALM_INT_ENABLE); chip->rtc = devm_rtc_device_register(&pdev->dev, "rtc-ac100", &ac100_rtc_ops, THIS_MODULE); if (IS_ERR(chip->rtc)) { dev_err(&pdev->dev, "unable to register device\n"); return PTR_ERR(chip->rtc); } ret = ac100_rtc_register_clks(chip); if (ret) return ret; dev_info(&pdev->dev, "RTC enabled\n"); return 0; }

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static int ac100_rtc_remove(struct platform_device *pdev) { struct ac100_rtc_dev *chip = platform_get_drvdata(pdev); ac100_rtc_unregister_clks(chip); return 0; }

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static const struct of_device_id ac100_rtc_match[] = { { .compatible = "x-powers,ac100-rtc" }, { }, }; MODULE_DEVICE_TABLE(of, ac100_rtc_match); static struct platform_driver ac100_rtc_driver = { .probe = ac100_rtc_probe, .remove = ac100_rtc_remove, .driver = { .name = "ac100-rtc", .of_match_table = of_match_ptr(ac100_rtc_match), }, }; module_platform_driver(ac100_rtc_driver); MODULE_DESCRIPTION("X-Powers AC100 RTC driver"); MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>"); MODULE_LICENSE("GPL v2");

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Directory: drivers/rtc
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