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Message-Id: <20230315110736.35506-4-jpanis@baylibre.com>
Date: Wed, 15 Mar 2023 12:07:35 +0100
From: Julien Panis <jpanis@...libre.com>
To: lee@...nel.org, robh+dt@...nel.org,
krzysztof.kozlowski+dt@...aro.org, corbet@....net, arnd@...db.de,
gregkh@...uxfoundation.org, derek.kiernan@...inx.com,
dragan.cvetic@...inx.com
Cc: eric.auger@...hat.com, jgg@...pe.ca, razor@...ckwall.org,
stephen@...workplumber.org, davem@...emloft.net,
christian.koenig@....com, contact@...rsion.fr,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-doc@...r.kernel.org, sterzik@...com, u-kumar1@...com,
eblanc@...libre.com, jneanne@...libre.com
Subject: [PATCH v2 3/4] misc: tps6594-esm: Add driver for TI TPS6594 ESM
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@...libre.com>
---
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@...libre.com>");
+MODULE_DESCRIPTION("TPS6594 Error Signal Monitor Driver");
+MODULE_LICENSE("GPL");
--
2.37.3
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