Input: pmic8xxx-pwrkey - support shutdown
On pm8xxx PMICs, shutdown and restart are signaled to the PMIC via a pin called PS_HOLD. When this pin goes low, the PMIC performs a configurable power sequence. Add a .shutdown hook so that we can properly configure this power sequence for shutdown or restart depending on the system state. Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Reviewed-by: Bjorn Andersson <bjorn.andersson@sonymobile.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Stephen Boyd
Dmitry Torokhov
parent
c57d5621d2
commit
02b0b79c30
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@ -20,17 +20,72 @@
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#include <linux/regmap.h>
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#include <linux/log2.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#define PON_CNTL_1 0x1C
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#define PON_CNTL_PULL_UP BIT(7)
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#define PON_CNTL_TRIG_DELAY_MASK (0x7)
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#define PON_CNTL_1_PULL_UP_EN 0xe0
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#define PON_CNTL_1_USB_PWR_EN 0x10
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#define PON_CNTL_1_WD_EN_RESET 0x08
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#define PM8058_SLEEP_CTRL 0x02b
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#define PM8921_SLEEP_CTRL 0x10a
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#define SLEEP_CTRL_SMPL_EN_RESET 0x04
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/* Regulator master enable addresses */
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#define REG_PM8058_VREG_EN_MSM 0x018
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#define REG_PM8058_VREG_EN_GRP_5_4 0x1c8
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/* Regulator control registers for shutdown/reset */
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#define PM8058_S0_CTRL 0x004
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#define PM8058_S1_CTRL 0x005
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#define PM8058_S3_CTRL 0x111
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#define PM8058_L21_CTRL 0x120
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#define PM8058_L22_CTRL 0x121
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#define PM8058_REGULATOR_ENABLE_MASK 0x80
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#define PM8058_REGULATOR_ENABLE 0x80
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#define PM8058_REGULATOR_DISABLE 0x00
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#define PM8058_REGULATOR_PULL_DOWN_MASK 0x40
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#define PM8058_REGULATOR_PULL_DOWN_EN 0x40
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/* Buck CTRL register */
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#define PM8058_SMPS_LEGACY_VREF_SEL 0x20
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#define PM8058_SMPS_LEGACY_VPROG_MASK 0x1f
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#define PM8058_SMPS_ADVANCED_BAND_MASK 0xC0
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#define PM8058_SMPS_ADVANCED_BAND_SHIFT 6
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#define PM8058_SMPS_ADVANCED_VPROG_MASK 0x3f
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/* Buck TEST2 registers for shutdown/reset */
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#define PM8058_S0_TEST2 0x084
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#define PM8058_S1_TEST2 0x085
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#define PM8058_S3_TEST2 0x11a
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#define PM8058_REGULATOR_BANK_WRITE 0x80
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#define PM8058_REGULATOR_BANK_MASK 0x70
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#define PM8058_REGULATOR_BANK_SHIFT 4
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#define PM8058_REGULATOR_BANK_SEL(n) ((n) << PM8058_REGULATOR_BANK_SHIFT)
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/* Buck TEST2 register bank 1 */
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#define PM8058_SMPS_LEGACY_VLOW_SEL 0x01
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/* Buck TEST2 register bank 7 */
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#define PM8058_SMPS_ADVANCED_MODE_MASK 0x02
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#define PM8058_SMPS_ADVANCED_MODE 0x02
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#define PM8058_SMPS_LEGACY_MODE 0x00
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/**
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* struct pmic8xxx_pwrkey - pmic8xxx pwrkey information
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* @key_press_irq: key press irq number
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* @regmap: device regmap
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* @shutdown_fn: shutdown configuration function
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*/
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struct pmic8xxx_pwrkey {
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int key_press_irq;
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struct regmap *regmap;
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int (*shutdown_fn)(struct pmic8xxx_pwrkey *, bool);
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};
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static irqreturn_t pwrkey_press_irq(int irq, void *_pwr)
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@ -76,6 +131,212 @@ static int __maybe_unused pmic8xxx_pwrkey_resume(struct device *dev)
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static SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops,
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pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume);
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static void pmic8xxx_pwrkey_shutdown(struct platform_device *pdev)
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{
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struct pmic8xxx_pwrkey *pwrkey = platform_get_drvdata(pdev);
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int error;
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u8 mask, val;
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bool reset = system_state == SYSTEM_RESTART;
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if (pwrkey->shutdown_fn) {
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error = pwrkey->shutdown_fn(pwrkey, reset);
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if (error)
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return;
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}
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/*
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* Select action to perform (reset or shutdown) when PS_HOLD goes low.
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* Also ensure that KPD, CBL0, and CBL1 pull ups are enabled and that
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* USB charging is enabled.
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*/
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mask = PON_CNTL_1_PULL_UP_EN | PON_CNTL_1_USB_PWR_EN;
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mask |= PON_CNTL_1_WD_EN_RESET;
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val = mask;
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if (!reset)
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val &= ~PON_CNTL_1_WD_EN_RESET;
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regmap_update_bits(pwrkey->regmap, PON_CNTL_1, mask, val);
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}
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/*
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* Set an SMPS regulator to be disabled in its CTRL register, but enabled
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* in the master enable register. Also set it's pull down enable bit.
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* Take care to make sure that the output voltage doesn't change if switching
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* from advanced mode to legacy mode.
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*/
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static int pm8058_disable_smps_locally_set_pull_down(struct regmap *regmap,
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u16 ctrl_addr, u16 test2_addr, u16 master_enable_addr,
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u8 master_enable_bit)
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{
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int error;
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u8 vref_sel, vlow_sel, band, vprog, bank;
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unsigned int reg;
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bank = PM8058_REGULATOR_BANK_SEL(7);
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error = regmap_write(regmap, test2_addr, bank);
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if (error)
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return error;
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error = regmap_read(regmap, test2_addr, ®);
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if (error)
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return error;
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reg &= PM8058_SMPS_ADVANCED_MODE_MASK;
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/* Check if in advanced mode. */
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if (reg == PM8058_SMPS_ADVANCED_MODE) {
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/* Determine current output voltage. */
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error = regmap_read(regmap, ctrl_addr, ®);
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if (error)
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return error;
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band = reg & PM8058_SMPS_ADVANCED_BAND_MASK;
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band >>= PM8058_SMPS_ADVANCED_BAND_SHIFT;
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switch (band) {
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case 3:
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vref_sel = 0;
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vlow_sel = 0;
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break;
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case 2:
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vref_sel = PM8058_SMPS_LEGACY_VREF_SEL;
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vlow_sel = 0;
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break;
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case 1:
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vref_sel = PM8058_SMPS_LEGACY_VREF_SEL;
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vlow_sel = PM8058_SMPS_LEGACY_VLOW_SEL;
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break;
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default:
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pr_err("%s: regulator already disabled\n", __func__);
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return -EPERM;
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}
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vprog = reg & PM8058_SMPS_ADVANCED_VPROG_MASK;
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/* Round up if fine step is in use. */
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vprog = (vprog + 1) >> 1;
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if (vprog > PM8058_SMPS_LEGACY_VPROG_MASK)
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vprog = PM8058_SMPS_LEGACY_VPROG_MASK;
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/* Set VLOW_SEL bit. */
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bank = PM8058_REGULATOR_BANK_SEL(1);
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error = regmap_write(regmap, test2_addr, bank);
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if (error)
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return error;
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error = regmap_update_bits(regmap, test2_addr,
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PM8058_REGULATOR_BANK_WRITE | PM8058_REGULATOR_BANK_MASK
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| PM8058_SMPS_LEGACY_VLOW_SEL,
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PM8058_REGULATOR_BANK_WRITE |
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PM8058_REGULATOR_BANK_SEL(1) | vlow_sel);
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if (error)
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return error;
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/* Switch to legacy mode */
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bank = PM8058_REGULATOR_BANK_SEL(7);
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error = regmap_write(regmap, test2_addr, bank);
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if (error)
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return error;
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error = regmap_update_bits(regmap, test2_addr,
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PM8058_REGULATOR_BANK_WRITE |
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PM8058_REGULATOR_BANK_MASK |
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PM8058_SMPS_ADVANCED_MODE_MASK,
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PM8058_REGULATOR_BANK_WRITE |
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PM8058_REGULATOR_BANK_SEL(7) |
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PM8058_SMPS_LEGACY_MODE);
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if (error)
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return error;
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/* Enable locally, enable pull down, keep voltage the same. */
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error = regmap_update_bits(regmap, ctrl_addr,
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PM8058_REGULATOR_ENABLE_MASK |
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PM8058_REGULATOR_PULL_DOWN_MASK |
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PM8058_SMPS_LEGACY_VREF_SEL |
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PM8058_SMPS_LEGACY_VPROG_MASK,
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PM8058_REGULATOR_ENABLE | PM8058_REGULATOR_PULL_DOWN_EN
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| vref_sel | vprog);
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if (error)
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return error;
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}
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/* Enable in master control register. */
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error = regmap_update_bits(regmap, master_enable_addr,
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master_enable_bit, master_enable_bit);
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if (error)
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return error;
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/* Disable locally and enable pull down. */
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return regmap_update_bits(regmap, ctrl_addr,
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PM8058_REGULATOR_ENABLE_MASK | PM8058_REGULATOR_PULL_DOWN_MASK,
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PM8058_REGULATOR_DISABLE | PM8058_REGULATOR_PULL_DOWN_EN);
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}
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static int pm8058_disable_ldo_locally_set_pull_down(struct regmap *regmap,
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u16 ctrl_addr, u16 master_enable_addr, u8 master_enable_bit)
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{
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int error;
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/* Enable LDO in master control register. */
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error = regmap_update_bits(regmap, master_enable_addr,
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master_enable_bit, master_enable_bit);
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if (error)
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return error;
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/* Disable LDO in CTRL register and set pull down */
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return regmap_update_bits(regmap, ctrl_addr,
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PM8058_REGULATOR_ENABLE_MASK | PM8058_REGULATOR_PULL_DOWN_MASK,
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PM8058_REGULATOR_DISABLE | PM8058_REGULATOR_PULL_DOWN_EN);
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}
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static int pm8058_pwrkey_shutdown(struct pmic8xxx_pwrkey *pwrkey, bool reset)
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{
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int error;
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struct regmap *regmap = pwrkey->regmap;
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u8 mask, val;
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/* When shutting down, enable active pulldowns on important rails. */
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if (!reset) {
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/* Disable SMPS's 0,1,3 locally and set pulldown enable bits. */
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pm8058_disable_smps_locally_set_pull_down(regmap,
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PM8058_S0_CTRL, PM8058_S0_TEST2,
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REG_PM8058_VREG_EN_MSM, BIT(7));
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pm8058_disable_smps_locally_set_pull_down(regmap,
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PM8058_S1_CTRL, PM8058_S1_TEST2,
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REG_PM8058_VREG_EN_MSM, BIT(6));
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pm8058_disable_smps_locally_set_pull_down(regmap,
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PM8058_S3_CTRL, PM8058_S3_TEST2,
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REG_PM8058_VREG_EN_GRP_5_4, BIT(7) | BIT(4));
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/* Disable LDO 21 locally and set pulldown enable bit. */
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pm8058_disable_ldo_locally_set_pull_down(regmap,
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PM8058_L21_CTRL, REG_PM8058_VREG_EN_GRP_5_4,
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BIT(1));
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}
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/*
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* Fix-up: Set regulator LDO22 to 1.225 V in high power mode. Leave its
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* pull-down state intact. This ensures a safe shutdown.
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*/
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error = regmap_update_bits(regmap, PM8058_L22_CTRL, 0xbf, 0x93);
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if (error)
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return error;
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/* Enable SMPL if resetting is desired */
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mask = SLEEP_CTRL_SMPL_EN_RESET;
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val = 0;
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if (reset)
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val = mask;
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return regmap_update_bits(regmap, PM8058_SLEEP_CTRL, mask, val);
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}
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static int pm8921_pwrkey_shutdown(struct pmic8xxx_pwrkey *pwrkey, bool reset)
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{
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struct regmap *regmap = pwrkey->regmap;
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u8 mask = SLEEP_CTRL_SMPL_EN_RESET;
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u8 val = 0;
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/* Enable SMPL if resetting is desired */
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if (reset)
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val = mask;
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return regmap_update_bits(regmap, PM8921_SLEEP_CTRL, mask, val);
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}
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static int pmic8xxx_pwrkey_probe(struct platform_device *pdev)
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{
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struct input_dev *pwr;
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@ -109,6 +370,8 @@ static int pmic8xxx_pwrkey_probe(struct platform_device *pdev)
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if (!pwrkey)
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return -ENOMEM;
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pwrkey->shutdown_fn = of_device_get_match_data(&pdev->dev);
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pwrkey->regmap = regmap;
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pwrkey->key_press_irq = key_press_irq;
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pwr = devm_input_allocate_device(&pdev->dev);
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@ -182,8 +445,8 @@ static int pmic8xxx_pwrkey_remove(struct platform_device *pdev)
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}
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static const struct of_device_id pm8xxx_pwr_key_id_table[] = {
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{ .compatible = "qcom,pm8058-pwrkey" },
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{ .compatible = "qcom,pm8921-pwrkey" },
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{ .compatible = "qcom,pm8058-pwrkey", .data = &pm8058_pwrkey_shutdown },
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{ .compatible = "qcom,pm8921-pwrkey", .data = &pm8921_pwrkey_shutdown },
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{ }
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};
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MODULE_DEVICE_TABLE(of, pm8xxx_pwr_key_id_table);
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@ -191,6 +454,7 @@ MODULE_DEVICE_TABLE(of, pm8xxx_pwr_key_id_table);
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static struct platform_driver pmic8xxx_pwrkey_driver = {
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.probe = pmic8xxx_pwrkey_probe,
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.remove = pmic8xxx_pwrkey_remove,
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.shutdown = pmic8xxx_pwrkey_shutdown,
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.driver = {
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.name = "pm8xxx-pwrkey",
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.pm = &pm8xxx_pwr_key_pm_ops,
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