cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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pmic8xxx-pwrkey.c (12654B)


      1// SPDX-License-Identifier: GPL-2.0-only
      2/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
      3 */
      4
      5#include <linux/module.h>
      6#include <linux/kernel.h>
      7#include <linux/errno.h>
      8#include <linux/slab.h>
      9#include <linux/input.h>
     10#include <linux/interrupt.h>
     11#include <linux/platform_device.h>
     12#include <linux/regmap.h>
     13#include <linux/log2.h>
     14#include <linux/of.h>
     15#include <linux/of_device.h>
     16
     17#define PON_CNTL_1 0x1C
     18#define PON_CNTL_PULL_UP BIT(7)
     19#define PON_CNTL_TRIG_DELAY_MASK (0x7)
     20#define PON_CNTL_1_PULL_UP_EN			0xe0
     21#define PON_CNTL_1_USB_PWR_EN			0x10
     22#define PON_CNTL_1_WD_EN_RESET			0x08
     23
     24#define PM8058_SLEEP_CTRL			0x02b
     25#define PM8921_SLEEP_CTRL			0x10a
     26
     27#define SLEEP_CTRL_SMPL_EN_RESET		0x04
     28
     29/* Regulator master enable addresses */
     30#define REG_PM8058_VREG_EN_MSM			0x018
     31#define REG_PM8058_VREG_EN_GRP_5_4		0x1c8
     32
     33/* Regulator control registers for shutdown/reset */
     34#define PM8058_S0_CTRL				0x004
     35#define PM8058_S1_CTRL				0x005
     36#define PM8058_S3_CTRL				0x111
     37#define PM8058_L21_CTRL				0x120
     38#define PM8058_L22_CTRL				0x121
     39
     40#define PM8058_REGULATOR_ENABLE_MASK		0x80
     41#define PM8058_REGULATOR_ENABLE			0x80
     42#define PM8058_REGULATOR_DISABLE		0x00
     43#define PM8058_REGULATOR_PULL_DOWN_MASK		0x40
     44#define PM8058_REGULATOR_PULL_DOWN_EN		0x40
     45
     46/* Buck CTRL register */
     47#define PM8058_SMPS_LEGACY_VREF_SEL		0x20
     48#define PM8058_SMPS_LEGACY_VPROG_MASK		0x1f
     49#define PM8058_SMPS_ADVANCED_BAND_MASK		0xC0
     50#define PM8058_SMPS_ADVANCED_BAND_SHIFT		6
     51#define PM8058_SMPS_ADVANCED_VPROG_MASK		0x3f
     52
     53/* Buck TEST2 registers for shutdown/reset */
     54#define PM8058_S0_TEST2				0x084
     55#define PM8058_S1_TEST2				0x085
     56#define PM8058_S3_TEST2				0x11a
     57
     58#define PM8058_REGULATOR_BANK_WRITE		0x80
     59#define PM8058_REGULATOR_BANK_MASK		0x70
     60#define PM8058_REGULATOR_BANK_SHIFT		4
     61#define PM8058_REGULATOR_BANK_SEL(n)	((n) << PM8058_REGULATOR_BANK_SHIFT)
     62
     63/* Buck TEST2 register bank 1 */
     64#define PM8058_SMPS_LEGACY_VLOW_SEL		0x01
     65
     66/* Buck TEST2 register bank 7 */
     67#define PM8058_SMPS_ADVANCED_MODE_MASK		0x02
     68#define PM8058_SMPS_ADVANCED_MODE		0x02
     69#define PM8058_SMPS_LEGACY_MODE			0x00
     70
     71/**
     72 * struct pmic8xxx_pwrkey - pmic8xxx pwrkey information
     73 * @key_press_irq: key press irq number
     74 * @regmap: device regmap
     75 * @shutdown_fn: shutdown configuration function
     76 */
     77struct pmic8xxx_pwrkey {
     78	int key_press_irq;
     79	struct regmap *regmap;
     80	int (*shutdown_fn)(struct pmic8xxx_pwrkey *, bool);
     81};
     82
     83static irqreturn_t pwrkey_press_irq(int irq, void *_pwr)
     84{
     85	struct input_dev *pwr = _pwr;
     86
     87	input_report_key(pwr, KEY_POWER, 1);
     88	input_sync(pwr);
     89
     90	return IRQ_HANDLED;
     91}
     92
     93static irqreturn_t pwrkey_release_irq(int irq, void *_pwr)
     94{
     95	struct input_dev *pwr = _pwr;
     96
     97	input_report_key(pwr, KEY_POWER, 0);
     98	input_sync(pwr);
     99
    100	return IRQ_HANDLED;
    101}
    102
    103static int __maybe_unused pmic8xxx_pwrkey_suspend(struct device *dev)
    104{
    105	struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
    106
    107	if (device_may_wakeup(dev))
    108		enable_irq_wake(pwrkey->key_press_irq);
    109
    110	return 0;
    111}
    112
    113static int __maybe_unused pmic8xxx_pwrkey_resume(struct device *dev)
    114{
    115	struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
    116
    117	if (device_may_wakeup(dev))
    118		disable_irq_wake(pwrkey->key_press_irq);
    119
    120	return 0;
    121}
    122
    123static SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops,
    124		pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume);
    125
    126static void pmic8xxx_pwrkey_shutdown(struct platform_device *pdev)
    127{
    128	struct pmic8xxx_pwrkey *pwrkey = platform_get_drvdata(pdev);
    129	int error;
    130	u8 mask, val;
    131	bool reset = system_state == SYSTEM_RESTART;
    132
    133	if (pwrkey->shutdown_fn) {
    134		error = pwrkey->shutdown_fn(pwrkey, reset);
    135		if (error)
    136			return;
    137	}
    138
    139	/*
    140	 * Select action to perform (reset or shutdown) when PS_HOLD goes low.
    141	 * Also ensure that KPD, CBL0, and CBL1 pull ups are enabled and that
    142	 * USB charging is enabled.
    143	 */
    144	mask = PON_CNTL_1_PULL_UP_EN | PON_CNTL_1_USB_PWR_EN;
    145	mask |= PON_CNTL_1_WD_EN_RESET;
    146	val = mask;
    147	if (!reset)
    148		val &= ~PON_CNTL_1_WD_EN_RESET;
    149
    150	regmap_update_bits(pwrkey->regmap, PON_CNTL_1, mask, val);
    151}
    152
    153/*
    154 * Set an SMPS regulator to be disabled in its CTRL register, but enabled
    155 * in the master enable register.  Also set it's pull down enable bit.
    156 * Take care to make sure that the output voltage doesn't change if switching
    157 * from advanced mode to legacy mode.
    158 */
    159static int pm8058_disable_smps_locally_set_pull_down(struct regmap *regmap,
    160	u16 ctrl_addr, u16 test2_addr, u16 master_enable_addr,
    161	u8 master_enable_bit)
    162{
    163	int error;
    164	u8 vref_sel, vlow_sel, band, vprog, bank;
    165	unsigned int reg;
    166
    167	bank = PM8058_REGULATOR_BANK_SEL(7);
    168	error = regmap_write(regmap, test2_addr, bank);
    169	if (error)
    170		return error;
    171
    172	error = regmap_read(regmap, test2_addr, &reg);
    173	if (error)
    174		return error;
    175
    176	reg &= PM8058_SMPS_ADVANCED_MODE_MASK;
    177	/* Check if in advanced mode. */
    178	if (reg == PM8058_SMPS_ADVANCED_MODE) {
    179		/* Determine current output voltage. */
    180		error = regmap_read(regmap, ctrl_addr, &reg);
    181		if (error)
    182			return error;
    183
    184		band = reg & PM8058_SMPS_ADVANCED_BAND_MASK;
    185		band >>= PM8058_SMPS_ADVANCED_BAND_SHIFT;
    186		switch (band) {
    187		case 3:
    188			vref_sel = 0;
    189			vlow_sel = 0;
    190			break;
    191		case 2:
    192			vref_sel = PM8058_SMPS_LEGACY_VREF_SEL;
    193			vlow_sel = 0;
    194			break;
    195		case 1:
    196			vref_sel = PM8058_SMPS_LEGACY_VREF_SEL;
    197			vlow_sel = PM8058_SMPS_LEGACY_VLOW_SEL;
    198			break;
    199		default:
    200			pr_err("%s: regulator already disabled\n", __func__);
    201			return -EPERM;
    202		}
    203		vprog = reg & PM8058_SMPS_ADVANCED_VPROG_MASK;
    204		/* Round up if fine step is in use. */
    205		vprog = (vprog + 1) >> 1;
    206		if (vprog > PM8058_SMPS_LEGACY_VPROG_MASK)
    207			vprog = PM8058_SMPS_LEGACY_VPROG_MASK;
    208
    209		/* Set VLOW_SEL bit. */
    210		bank = PM8058_REGULATOR_BANK_SEL(1);
    211		error = regmap_write(regmap, test2_addr, bank);
    212		if (error)
    213			return error;
    214
    215		error = regmap_update_bits(regmap, test2_addr,
    216			PM8058_REGULATOR_BANK_WRITE | PM8058_REGULATOR_BANK_MASK
    217				| PM8058_SMPS_LEGACY_VLOW_SEL,
    218			PM8058_REGULATOR_BANK_WRITE |
    219			PM8058_REGULATOR_BANK_SEL(1) | vlow_sel);
    220		if (error)
    221			return error;
    222
    223		/* Switch to legacy mode */
    224		bank = PM8058_REGULATOR_BANK_SEL(7);
    225		error = regmap_write(regmap, test2_addr, bank);
    226		if (error)
    227			return error;
    228
    229		error = regmap_update_bits(regmap, test2_addr,
    230				PM8058_REGULATOR_BANK_WRITE |
    231				PM8058_REGULATOR_BANK_MASK |
    232				PM8058_SMPS_ADVANCED_MODE_MASK,
    233				PM8058_REGULATOR_BANK_WRITE |
    234				PM8058_REGULATOR_BANK_SEL(7) |
    235				PM8058_SMPS_LEGACY_MODE);
    236		if (error)
    237			return error;
    238
    239		/* Enable locally, enable pull down, keep voltage the same. */
    240		error = regmap_update_bits(regmap, ctrl_addr,
    241			PM8058_REGULATOR_ENABLE_MASK |
    242			PM8058_REGULATOR_PULL_DOWN_MASK |
    243			PM8058_SMPS_LEGACY_VREF_SEL |
    244			PM8058_SMPS_LEGACY_VPROG_MASK,
    245			PM8058_REGULATOR_ENABLE | PM8058_REGULATOR_PULL_DOWN_EN
    246				| vref_sel | vprog);
    247		if (error)
    248			return error;
    249	}
    250
    251	/* Enable in master control register. */
    252	error = regmap_update_bits(regmap, master_enable_addr,
    253			master_enable_bit, master_enable_bit);
    254	if (error)
    255		return error;
    256
    257	/* Disable locally and enable pull down. */
    258	return regmap_update_bits(regmap, ctrl_addr,
    259		PM8058_REGULATOR_ENABLE_MASK | PM8058_REGULATOR_PULL_DOWN_MASK,
    260		PM8058_REGULATOR_DISABLE | PM8058_REGULATOR_PULL_DOWN_EN);
    261}
    262
    263static int pm8058_disable_ldo_locally_set_pull_down(struct regmap *regmap,
    264		u16 ctrl_addr, u16 master_enable_addr, u8 master_enable_bit)
    265{
    266	int error;
    267
    268	/* Enable LDO in master control register. */
    269	error = regmap_update_bits(regmap, master_enable_addr,
    270			master_enable_bit, master_enable_bit);
    271	if (error)
    272		return error;
    273
    274	/* Disable LDO in CTRL register and set pull down */
    275	return regmap_update_bits(regmap, ctrl_addr,
    276		PM8058_REGULATOR_ENABLE_MASK | PM8058_REGULATOR_PULL_DOWN_MASK,
    277		PM8058_REGULATOR_DISABLE | PM8058_REGULATOR_PULL_DOWN_EN);
    278}
    279
    280static int pm8058_pwrkey_shutdown(struct pmic8xxx_pwrkey *pwrkey, bool reset)
    281{
    282	int error;
    283	struct regmap *regmap = pwrkey->regmap;
    284	u8 mask, val;
    285
    286	/* When shutting down, enable active pulldowns on important rails. */
    287	if (!reset) {
    288		/* Disable SMPS's 0,1,3 locally and set pulldown enable bits. */
    289		pm8058_disable_smps_locally_set_pull_down(regmap,
    290			PM8058_S0_CTRL, PM8058_S0_TEST2,
    291			REG_PM8058_VREG_EN_MSM, BIT(7));
    292		pm8058_disable_smps_locally_set_pull_down(regmap,
    293			PM8058_S1_CTRL, PM8058_S1_TEST2,
    294			REG_PM8058_VREG_EN_MSM, BIT(6));
    295		pm8058_disable_smps_locally_set_pull_down(regmap,
    296			PM8058_S3_CTRL, PM8058_S3_TEST2,
    297			REG_PM8058_VREG_EN_GRP_5_4, BIT(7) | BIT(4));
    298		/* Disable LDO 21 locally and set pulldown enable bit. */
    299		pm8058_disable_ldo_locally_set_pull_down(regmap,
    300			PM8058_L21_CTRL, REG_PM8058_VREG_EN_GRP_5_4,
    301			BIT(1));
    302	}
    303
    304	/*
    305	 * Fix-up: Set regulator LDO22 to 1.225 V in high power mode. Leave its
    306	 * pull-down state intact. This ensures a safe shutdown.
    307	 */
    308	error = regmap_update_bits(regmap, PM8058_L22_CTRL, 0xbf, 0x93);
    309	if (error)
    310		return error;
    311
    312	/* Enable SMPL if resetting is desired */
    313	mask = SLEEP_CTRL_SMPL_EN_RESET;
    314	val = 0;
    315	if (reset)
    316		val = mask;
    317	return regmap_update_bits(regmap, PM8058_SLEEP_CTRL, mask, val);
    318}
    319
    320static int pm8921_pwrkey_shutdown(struct pmic8xxx_pwrkey *pwrkey, bool reset)
    321{
    322	struct regmap *regmap = pwrkey->regmap;
    323	u8 mask = SLEEP_CTRL_SMPL_EN_RESET;
    324	u8 val = 0;
    325
    326	/* Enable SMPL if resetting is desired */
    327	if (reset)
    328		val = mask;
    329	return regmap_update_bits(regmap, PM8921_SLEEP_CTRL, mask, val);
    330}
    331
    332static int pmic8xxx_pwrkey_probe(struct platform_device *pdev)
    333{
    334	struct input_dev *pwr;
    335	int key_release_irq = platform_get_irq(pdev, 0);
    336	int key_press_irq = platform_get_irq(pdev, 1);
    337	int err;
    338	unsigned int delay;
    339	unsigned int pon_cntl;
    340	struct regmap *regmap;
    341	struct pmic8xxx_pwrkey *pwrkey;
    342	u32 kpd_delay;
    343	bool pull_up;
    344
    345	if (of_property_read_u32(pdev->dev.of_node, "debounce", &kpd_delay))
    346		kpd_delay = 15625;
    347
    348	/* Valid range of pwr key trigger delay is 1/64 sec to 2 seconds. */
    349	if (kpd_delay > USEC_PER_SEC * 2 || kpd_delay < USEC_PER_SEC / 64) {
    350		dev_err(&pdev->dev, "invalid power key trigger delay\n");
    351		return -EINVAL;
    352	}
    353
    354	pull_up = of_property_read_bool(pdev->dev.of_node, "pull-up");
    355
    356	regmap = dev_get_regmap(pdev->dev.parent, NULL);
    357	if (!regmap) {
    358		dev_err(&pdev->dev, "failed to locate regmap for the device\n");
    359		return -ENODEV;
    360	}
    361
    362	pwrkey = devm_kzalloc(&pdev->dev, sizeof(*pwrkey), GFP_KERNEL);
    363	if (!pwrkey)
    364		return -ENOMEM;
    365
    366	pwrkey->shutdown_fn = of_device_get_match_data(&pdev->dev);
    367	pwrkey->regmap = regmap;
    368	pwrkey->key_press_irq = key_press_irq;
    369
    370	pwr = devm_input_allocate_device(&pdev->dev);
    371	if (!pwr) {
    372		dev_dbg(&pdev->dev, "Can't allocate power button\n");
    373		return -ENOMEM;
    374	}
    375
    376	input_set_capability(pwr, EV_KEY, KEY_POWER);
    377
    378	pwr->name = "pmic8xxx_pwrkey";
    379	pwr->phys = "pmic8xxx_pwrkey/input0";
    380
    381	delay = (kpd_delay << 6) / USEC_PER_SEC;
    382	delay = ilog2(delay);
    383
    384	err = regmap_read(regmap, PON_CNTL_1, &pon_cntl);
    385	if (err < 0) {
    386		dev_err(&pdev->dev, "failed reading PON_CNTL_1 err=%d\n", err);
    387		return err;
    388	}
    389
    390	pon_cntl &= ~PON_CNTL_TRIG_DELAY_MASK;
    391	pon_cntl |= (delay & PON_CNTL_TRIG_DELAY_MASK);
    392	if (pull_up)
    393		pon_cntl |= PON_CNTL_PULL_UP;
    394	else
    395		pon_cntl &= ~PON_CNTL_PULL_UP;
    396
    397	err = regmap_write(regmap, PON_CNTL_1, pon_cntl);
    398	if (err < 0) {
    399		dev_err(&pdev->dev, "failed writing PON_CNTL_1 err=%d\n", err);
    400		return err;
    401	}
    402
    403	err = devm_request_irq(&pdev->dev, key_press_irq, pwrkey_press_irq,
    404			       IRQF_TRIGGER_RISING,
    405			       "pmic8xxx_pwrkey_press", pwr);
    406	if (err) {
    407		dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
    408			key_press_irq, err);
    409		return err;
    410	}
    411
    412	err = devm_request_irq(&pdev->dev, key_release_irq, pwrkey_release_irq,
    413			       IRQF_TRIGGER_RISING,
    414			       "pmic8xxx_pwrkey_release", pwr);
    415	if (err) {
    416		dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
    417			key_release_irq, err);
    418		return err;
    419	}
    420
    421	err = input_register_device(pwr);
    422	if (err) {
    423		dev_err(&pdev->dev, "Can't register power key: %d\n", err);
    424		return err;
    425	}
    426
    427	platform_set_drvdata(pdev, pwrkey);
    428	device_init_wakeup(&pdev->dev, 1);
    429
    430	return 0;
    431}
    432
    433static const struct of_device_id pm8xxx_pwr_key_id_table[] = {
    434	{ .compatible = "qcom,pm8058-pwrkey", .data = &pm8058_pwrkey_shutdown },
    435	{ .compatible = "qcom,pm8921-pwrkey", .data = &pm8921_pwrkey_shutdown },
    436	{ }
    437};
    438MODULE_DEVICE_TABLE(of, pm8xxx_pwr_key_id_table);
    439
    440static struct platform_driver pmic8xxx_pwrkey_driver = {
    441	.probe		= pmic8xxx_pwrkey_probe,
    442	.shutdown	= pmic8xxx_pwrkey_shutdown,
    443	.driver		= {
    444		.name	= "pm8xxx-pwrkey",
    445		.pm	= &pm8xxx_pwr_key_pm_ops,
    446		.of_match_table = pm8xxx_pwr_key_id_table,
    447	},
    448};
    449module_platform_driver(pmic8xxx_pwrkey_driver);
    450
    451MODULE_ALIAS("platform:pmic8xxx_pwrkey");
    452MODULE_DESCRIPTION("PMIC8XXX Power Key driver");
    453MODULE_LICENSE("GPL v2");
    454MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>");