misc: pmic_esm: Add support for PMIC ESM driver
The ESM (Error Signal Monitor) is used on certain PMIC versions to
handle error signals propagating from rest of the system. If these
reach the PMIC, it is typically a last resort fatal error which
requires a system reset. The ESM driver does the proper configuration
for the ESM module to reach this end goal. Initially, only TPS65941
PMIC is supported for this.
Signed-off-by: Tero Kristo <t-kristo@ti.com>
diff --git a/drivers/misc/esm_pmic.c b/drivers/misc/esm_pmic.c
new file mode 100644
index 0000000..92c8d68
--- /dev/null
+++ b/drivers/misc/esm_pmic.c
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * PMIC Error Signal Monitor driver
+ *
+ * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
+ * Tero Kristo <t-kristo@ti.com>
+ *
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <power/pmic.h>
+#include <dm/device_compat.h>
+
+#define INT_ESM_REG 0x6c
+#define INT_ESM_MASK 0x3f
+
+#define ESM_MCU_START_REG 0x8f
+
+#define ESM_MCU_START BIT(0)
+
+#define ESM_MCU_MODE_CFG_REG 0x92
+
+#define ESM_MCU_EN BIT(6)
+#define ESM_MCU_ENDRV BIT(5)
+
+/**
+ * pmic_esm_probe: configures and enables PMIC ESM functionality
+ *
+ * Configures ESM PMIC support and enables it.
+ */
+static int pmic_esm_probe(struct udevice *dev)
+{
+ int ret;
+
+ ret = pmic_reg_write(dev->parent, INT_ESM_REG, INT_ESM_MASK);
+ if (ret) {
+ dev_err(dev, "clearing ESM irqs failed: %d\n", ret);
+ return ret;
+ }
+
+ ret = pmic_reg_write(dev->parent, ESM_MCU_MODE_CFG_REG,
+ ESM_MCU_EN | ESM_MCU_ENDRV);
+ if (ret) {
+ dev_err(dev, "setting ESM mode failed: %d\n", ret);
+ return ret;
+ }
+
+ ret = pmic_reg_write(dev->parent, ESM_MCU_START_REG, ESM_MCU_START);
+ if (ret) {
+ dev_err(dev, "starting ESM failed: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct udevice_id pmic_esm_ids[] = {
+ { .compatible = "ti,tps659413-esm" },
+ {}
+};
+
+U_BOOT_DRIVER(pmic_esm) = {
+ .name = "esm_pmic",
+ .of_match = pmic_esm_ids,
+ .id = UCLASS_MISC,
+ .probe = pmic_esm_probe,
+};