1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * PMIC Error Signal Monitor driver
4 *
5 * Copyright (C) 2019 Texas Instruments Incorporated - https://www.ti.com/
6 * Tero Kristo <t-kristo@ti.com>
7 *
8 */
9
10 #include <dm.h>
11 #include <errno.h>
12 #include <power/pmic.h>
13 #include <dm/device_compat.h>
14 #include <linux/bitops.h>
15
16 #define INT_ESM_REG 0x6c
17 #define INT_ESM_MASK 0x3f
18
19 #define ESM_MCU_START_REG 0x8f
20
21 #define ESM_MCU_START BIT(0)
22
23 #define ESM_MCU_MODE_CFG_REG 0x92
24
25 #define ESM_MCU_EN BIT(6)
26 #define ESM_MCU_ENDRV BIT(5)
27
28 #define ESM_MCU_MASK_REG 0x59
29 #define ESM_MCU_MASK 0x7
30
31 /**
32 * pmic_esm_probe: configures and enables PMIC ESM functionality
33 *
34 * Configures ESM PMIC support and enables it.
35 */
pmic_esm_probe(struct udevice * dev)36 static int pmic_esm_probe(struct udevice *dev)
37 {
38 int ret;
39
40 ret = pmic_reg_write(dev->parent, INT_ESM_REG, INT_ESM_MASK);
41 if (ret) {
42 dev_err(dev, "clearing ESM irqs failed: %d\n", ret);
43 return ret;
44 }
45
46 ret = pmic_reg_write(dev->parent, ESM_MCU_MODE_CFG_REG,
47 ESM_MCU_EN | ESM_MCU_ENDRV);
48 if (ret) {
49 dev_err(dev, "setting ESM mode failed: %d\n", ret);
50 return ret;
51 }
52
53 ret = pmic_reg_write(dev->parent, ESM_MCU_MASK_REG, ESM_MCU_MASK);
54 if (ret) {
55 dev_err(dev, "clearing ESM masks failed: %d\n", ret);
56 return ret;
57 }
58
59 ret = pmic_reg_write(dev->parent, ESM_MCU_START_REG, ESM_MCU_START);
60 if (ret) {
61 dev_err(dev, "starting ESM failed: %d\n", ret);
62 return ret;
63 }
64
65 return 0;
66 }
67
68 static const struct udevice_id pmic_esm_ids[] = {
69 { .compatible = "ti,tps659413-esm" },
70 {}
71 };
72
73 U_BOOT_DRIVER(pmic_esm) = {
74 .name = "esm_pmic",
75 .of_match = pmic_esm_ids,
76 .id = UCLASS_MISC,
77 .probe = pmic_esm_probe,
78 };
79