1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * PMIC Error Signal Monitor driver
4 *
5 * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
6 * Tero Kristo <t-kristo@ti.com>
7 *
8 */
9
10 #include <common.h>
11 #include <dm.h>
12 #include <errno.h>
13 #include <power/pmic.h>
14 #include <dm/device_compat.h>
15 #include <linux/bitops.h>
16
17 #define INT_ESM_REG 0x6c
18 #define INT_ESM_MASK 0x3f
19
20 #define ESM_MCU_START_REG 0x8f
21
22 #define ESM_MCU_START BIT(0)
23
24 #define ESM_MCU_MODE_CFG_REG 0x92
25
26 #define ESM_MCU_EN BIT(6)
27 #define ESM_MCU_ENDRV BIT(5)
28
29 #define ESM_MCU_MASK_REG 0x59
30 #define ESM_MCU_MASK 0x7
31
32 /**
33 * pmic_esm_probe: configures and enables PMIC ESM functionality
34 *
35 * Configures ESM PMIC support and enables it.
36 */
pmic_esm_probe(struct udevice * dev)37 static int pmic_esm_probe(struct udevice *dev)
38 {
39 int ret;
40
41 ret = pmic_reg_write(dev->parent, INT_ESM_REG, INT_ESM_MASK);
42 if (ret) {
43 dev_err(dev, "clearing ESM irqs failed: %d\n", ret);
44 return ret;
45 }
46
47 ret = pmic_reg_write(dev->parent, ESM_MCU_MODE_CFG_REG,
48 ESM_MCU_EN | ESM_MCU_ENDRV);
49 if (ret) {
50 dev_err(dev, "setting ESM mode failed: %d\n", ret);
51 return ret;
52 }
53
54 ret = pmic_reg_write(dev->parent, ESM_MCU_MASK_REG, ESM_MCU_MASK);
55 if (ret) {
56 dev_err(dev, "clearing ESM masks failed: %d\n", ret);
57 return ret;
58 }
59
60 ret = pmic_reg_write(dev->parent, ESM_MCU_START_REG, ESM_MCU_START);
61 if (ret) {
62 dev_err(dev, "starting ESM failed: %d\n", ret);
63 return ret;
64 }
65
66 return 0;
67 }
68
69 static const struct udevice_id pmic_esm_ids[] = {
70 { .compatible = "ti,tps659413-esm" },
71 {}
72 };
73
74 U_BOOT_DRIVER(pmic_esm) = {
75 .name = "esm_pmic",
76 .of_match = pmic_esm_ids,
77 .id = UCLASS_MISC,
78 .probe = pmic_esm_probe,
79 };
80