1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Qualcomm pm8916 pmic driver
4 *
5 * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
6 */
7 #include <common.h>
8 #include <dm.h>
9 #include <power/pmic.h>
10 #include <spmi/spmi.h>
11
12 #define PID_SHIFT 8
13 #define PID_MASK (0xFF << PID_SHIFT)
14 #define REG_MASK 0xFF
15
16 struct pm8916_priv {
17 uint32_t usid; /* Slave ID on SPMI bus */
18 };
19
pm8916_reg_count(struct udevice * dev)20 static int pm8916_reg_count(struct udevice *dev)
21 {
22 return 0xFFFF;
23 }
24
pm8916_write(struct udevice * dev,uint reg,const uint8_t * buff,int len)25 static int pm8916_write(struct udevice *dev, uint reg, const uint8_t *buff,
26 int len)
27 {
28 struct pm8916_priv *priv = dev_get_priv(dev);
29
30 if (len != 1)
31 return -EINVAL;
32
33 return spmi_reg_write(dev->parent, priv->usid,
34 (reg & PID_MASK) >> PID_SHIFT, reg & REG_MASK,
35 *buff);
36 }
37
pm8916_read(struct udevice * dev,uint reg,uint8_t * buff,int len)38 static int pm8916_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
39 {
40 struct pm8916_priv *priv = dev_get_priv(dev);
41 int val;
42
43 if (len != 1)
44 return -EINVAL;
45
46 val = spmi_reg_read(dev->parent, priv->usid,
47 (reg & PID_MASK) >> PID_SHIFT, reg & REG_MASK);
48
49 if (val < 0)
50 return val;
51 *buff = val;
52 return 0;
53 }
54
55 static struct dm_pmic_ops pm8916_ops = {
56 .reg_count = pm8916_reg_count,
57 .read = pm8916_read,
58 .write = pm8916_write,
59 };
60
61 static const struct udevice_id pm8916_ids[] = {
62 { .compatible = "qcom,spmi-pmic" },
63 { }
64 };
65
pm8916_probe(struct udevice * dev)66 static int pm8916_probe(struct udevice *dev)
67 {
68 struct pm8916_priv *priv = dev_get_priv(dev);
69
70 priv->usid = dev_read_addr(dev);
71
72 if (priv->usid == FDT_ADDR_T_NONE)
73 return -EINVAL;
74
75 return 0;
76 }
77
78 U_BOOT_DRIVER(pmic_pm8916) = {
79 .name = "pmic_pm8916",
80 .id = UCLASS_PMIC,
81 .of_match = pm8916_ids,
82 .bind = dm_scan_fdt_dev,
83 .probe = pm8916_probe,
84 .ops = &pm8916_ops,
85 .priv_auto_alloc_size = sizeof(struct pm8916_priv),
86 };
87