This patch adds support for TPS6594 ESM (Error Signal Monitor). This device monitors the SoC error output signal at its nERR_SOC input pin. In error condition, ESM toggles its nRSTOUT_SOC pin to reset the SoC. Signed-off-by: Julien Panis <jpanis@xxxxxxxxxxxx> --- drivers/misc/Kconfig | 11 ++++ drivers/misc/Makefile | 1 + drivers/misc/tps6594-esm.c | 132 +++++++++++++++++++++++++++++++++++++ 3 files changed, 144 insertions(+) create mode 100644 drivers/misc/tps6594-esm.c diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index 433aa4197785..c73c02801330 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -538,6 +538,17 @@ config TMR_INJECT Say N here unless you know what you are doing. +config TPS6594_ESM + tristate "TI TPS6594 Error Signal Monitor support" + depends on MFD_TPS6594 + default MFD_TPS6594 + help + Support ESM (Error Signal Monitor) on TPS6594 PMIC devices. + ESM is used typically to reboot the board in error condition. + + This driver can also be built as a module. If so, the module + will be called tps6594-esm. + source "drivers/misc/c2port/Kconfig" source "drivers/misc/eeprom/Kconfig" source "drivers/misc/cb710/Kconfig" diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index 56de43943cd5..3dc69ec69912 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -65,3 +65,4 @@ obj-$(CONFIG_GP_PCI1XXXX) += mchp_pci1xxxx/ obj-$(CONFIG_VCPU_STALL_DETECTOR) += vcpu_stall_detector.o obj-$(CONFIG_TMR_MANAGER) += xilinx_tmr_manager.o obj-$(CONFIG_TMR_INJECT) += xilinx_tmr_inject.o +obj-$(CONFIG_TPS6594_ESM) += tps6594-esm.o diff --git a/drivers/misc/tps6594-esm.c b/drivers/misc/tps6594-esm.c new file mode 100644 index 000000000000..db242b50846f --- /dev/null +++ b/drivers/misc/tps6594-esm.c @@ -0,0 +1,132 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * ESM (Error Signal Monitor) driver for TI TPS6594/TPS6593/LP8764X PMICs + * + * Copyright (C) 2022 BayLibre Incorporated - https://www.baylibre.com/ + */ + +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/regmap.h> + +#include <linux/mfd/tps6594.h> + +static irqreturn_t tps6594_esm_isr(int irq, void *dev_id) +{ + struct platform_device *pdev = dev_id; + int i; + + for (i = 0 ; i < pdev->num_resources ; i++) { + if (irq == platform_get_irq_byname(pdev, pdev->resource[i].name)) { + dev_err(pdev->dev.parent, "%s error detected\n", pdev->resource[i].name); + return IRQ_HANDLED; + } + } + + return IRQ_NONE; +} + +static int tps6594_esm_probe(struct platform_device *pdev) +{ + struct tps6594 *tps = dev_get_drvdata(pdev->dev.parent); + struct device *dev = &pdev->dev; + int irq; + int ret; + int i; + + for (i = 0 ; i < pdev->num_resources ; i++) { + irq = platform_get_irq_byname(pdev, pdev->resource[i].name); + if (irq < 0) + return dev_err_probe(dev, irq, "Failed to get %s irq\n", + pdev->resource[i].name); + + ret = devm_request_threaded_irq(dev, irq, NULL, + tps6594_esm_isr, IRQF_ONESHOT, + pdev->resource[i].name, pdev); + if (ret) + return dev_err_probe(dev, ret, "Failed to request irq\n"); + } + + ret = regmap_set_bits(tps->regmap, TPS6594_REG_ESM_SOC_MODE_CFG, + TPS6594_BIT_ESM_SOC_EN | TPS6594_BIT_ESM_SOC_ENDRV); + if (ret) + return dev_err_probe(dev, ret, "Failed to configure ESM\n"); + + ret = regmap_set_bits(tps->regmap, TPS6594_REG_ESM_SOC_START_REG, + TPS6594_BIT_ESM_SOC_START); + if (ret) + return dev_err_probe(dev, ret, "Failed to start ESM\n"); + + pm_runtime_enable(dev); + pm_runtime_get_sync(dev); + + return 0; +} + +static int tps6594_esm_remove(struct platform_device *pdev) +{ + struct tps6594 *tps = dev_get_drvdata(pdev->dev.parent); + struct device *dev = &pdev->dev; + int ret; + + ret = regmap_clear_bits(tps->regmap, TPS6594_REG_ESM_SOC_START_REG, + TPS6594_BIT_ESM_SOC_START); + if (ret) { + dev_err(dev, "Failed to stop ESM\n"); + goto out; + } + + ret = regmap_clear_bits(tps->regmap, TPS6594_REG_ESM_SOC_MODE_CFG, + TPS6594_BIT_ESM_SOC_EN | TPS6594_BIT_ESM_SOC_ENDRV); + if (ret) + dev_err(dev, "Failed to unconfigure ESM\n"); + +out: + pm_runtime_put_sync(dev); + pm_runtime_disable(dev); + + return ret; +} + +static int tps6594_esm_suspend(struct device *dev) +{ + struct tps6594 *tps = dev_get_drvdata(dev->parent); + int ret; + + ret = regmap_clear_bits(tps->regmap, TPS6594_REG_ESM_SOC_START_REG, + TPS6594_BIT_ESM_SOC_START); + + pm_runtime_put_sync(dev); + + return ret; +} + +static int tps6594_esm_resume(struct device *dev) +{ + struct tps6594 *tps = dev_get_drvdata(dev->parent); + + pm_runtime_get_sync(dev); + + return regmap_set_bits(tps->regmap, TPS6594_REG_ESM_SOC_START_REG, + TPS6594_BIT_ESM_SOC_START); +} + +static DEFINE_SIMPLE_DEV_PM_OPS(tps6594_esm_pm_ops, tps6594_esm_suspend, tps6594_esm_resume); + +static struct platform_driver tps6594_esm_driver = { + .driver = { + .name = "tps6594-esm", + .pm = pm_sleep_ptr(&tps6594_esm_pm_ops), + }, + .probe = tps6594_esm_probe, + .remove = tps6594_esm_remove, +}; + +module_platform_driver(tps6594_esm_driver); + +MODULE_ALIAS("platform:tps6594-esm"); +MODULE_AUTHOR("Julien Panis <jpanis@xxxxxxxxxxxx>"); +MODULE_DESCRIPTION("TPS6594 Error Signal Monitor Driver"); +MODULE_LICENSE("GPL"); -- 2.37.3
