1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2018
4 * Lukasz Majewski, DENX Software Engineering, lukma@denx.de
5 *
6 */
7
8#include <common.h>
9#include <dm.h>
10#include <errno.h>
11#include <fsl_pmic.h>
12#include <i2c.h>
13#include <asm/global_data.h>
14#include <power/pmic.h>
15
16DECLARE_GLOBAL_DATA_PTR;
17
18static int mc34708_reg_count(struct udevice *dev)
19{
20	return PMIC_NUM_OF_REGS;
21}
22
23static int mc34708_write(struct udevice *dev, uint reg, const u8 *buff,
24			 int len)
25{
26	u8 buf[3] = { 0 };
27	int ret;
28
29	if (len != MC34708_TRANSFER_SIZE)
30		return -EINVAL;
31
32	/*
33	 * The MC34708 sends data with big endian format, hence we need to
34	 * perform manual byte swap.
35	 */
36	buf[0] = buff[2];
37	buf[1] = buff[1];
38	buf[2] = buff[0];
39
40	ret = dm_i2c_write(dev, reg, buf, len);
41	if (ret)
42		printf("write error to device: %p register: %#x!\n", dev, reg);
43
44	return ret;
45}
46
47static int mc34708_read(struct udevice *dev, uint reg, u8 *buff, int len)
48{
49	u8 buf[3] = { 0 };
50	int ret;
51
52	if (len != MC34708_TRANSFER_SIZE)
53		return -EINVAL;
54
55	ret = dm_i2c_read(dev, reg, buf, len);
56	if (ret)
57		printf("read error from device: %p register: %#x!\n", dev, reg);
58
59	buff[0] = buf[2];
60	buff[1] = buf[1];
61	buff[2] = buf[0];
62
63	return ret;
64}
65
66static int mc34708_probe(struct udevice *dev)
67{
68	struct uc_pmic_priv *priv = dev_get_uclass_priv(dev);
69
70	priv->trans_len = MC34708_TRANSFER_SIZE;
71
72	/*
73	 * Handle PMIC Errata 37: APS mode not fully functional,
74	 * use explicit PWM or PFM instead
75	 */
76	pmic_clrsetbits(dev, MC34708_REG_SW12_OPMODE,
77			MC34708_SW1AMODE_MASK | MC34708_SW2MODE_MASK,
78			SW_MODE_PWMPWM | (SW_MODE_PWMPWM << 14u));
79
80	pmic_clrsetbits(dev, MC34708_REG_SW345_OPMODE,
81			MC34708_SW3MODE_MASK | MC34708_SW4AMODE_MASK |
82			MC34708_SW4BMODE_MASK | MC34708_SW5MODE_MASK,
83			SW_MODE_PWMPWM | (SW_MODE_PWMPWM << 6u) |
84			(SW_MODE_PWMPWM << 12u) | (SW_MODE_PWMPWM << 18u));
85
86	return 0;
87}
88
89static struct dm_pmic_ops mc34708_ops = {
90	.reg_count = mc34708_reg_count,
91	.read	= mc34708_read,
92	.write	= mc34708_write,
93};
94
95static const struct udevice_id mc34708_ids[] = {
96	{ .compatible = "fsl,mc34708" },
97	{ }
98};
99
100U_BOOT_DRIVER(pmic_mc34708) = {
101	.name		= "mc34708_pmic",
102	.id		= UCLASS_PMIC,
103	.of_match	= mc34708_ids,
104	.probe          = mc34708_probe,
105	.ops		= &mc34708_ops,
106};
107