xref: /openbmc/u-boot/drivers/power/pmic/mc34708.c (revision ef64e782)
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 <power/pmic.h>
14 
15 DECLARE_GLOBAL_DATA_PTR;
16 
17 static int mc34708_reg_count(struct udevice *dev)
18 {
19 	return PMIC_NUM_OF_REGS;
20 }
21 
22 static int mc34708_write(struct udevice *dev, uint reg, const u8 *buff,
23 			 int len)
24 {
25 	u8 buf[3] = { 0 };
26 	int ret;
27 
28 	if (len != MC34708_TRANSFER_SIZE)
29 		return -EINVAL;
30 
31 	/*
32 	 * The MC34708 sends data with big endian format, hence we need to
33 	 * perform manual byte swap.
34 	 */
35 	buf[0] = buff[2];
36 	buf[1] = buff[1];
37 	buf[2] = buff[0];
38 
39 	ret = dm_i2c_write(dev, reg, buf, len);
40 	if (ret)
41 		printf("write error to device: %p register: %#x!", dev, reg);
42 
43 	return ret;
44 }
45 
46 static int mc34708_read(struct udevice *dev, uint reg, u8 *buff, int len)
47 {
48 	u8 buf[3] = { 0 };
49 	int ret;
50 
51 	if (len != MC34708_TRANSFER_SIZE)
52 		return -EINVAL;
53 
54 	ret = dm_i2c_read(dev, reg, buf, len);
55 	if (ret)
56 		printf("read error from device: %p register: %#x!", dev, reg);
57 
58 	buff[0] = buf[2];
59 	buff[1] = buf[1];
60 	buff[2] = buf[0];
61 
62 	return ret;
63 }
64 
65 static int mc34708_probe(struct udevice *dev)
66 {
67 	struct uc_pmic_priv *priv = dev_get_uclass_priv(dev);
68 
69 	priv->trans_len = MC34708_TRANSFER_SIZE;
70 
71 	/*
72 	 * Handle PMIC Errata 37: APS mode not fully functional,
73 	 * use explicit PWM or PFM instead
74 	 */
75 	pmic_clrsetbits(dev, MC34708_REG_SW12_OPMODE,
76 			MC34708_SW1AMODE_MASK | MC34708_SW2MODE_MASK,
77 			SW_MODE_PWMPWM | (SW_MODE_PWMPWM << 14u));
78 
79 	pmic_clrsetbits(dev, MC34708_REG_SW345_OPMODE,
80 			MC34708_SW3MODE_MASK | MC34708_SW4AMODE_MASK |
81 			MC34708_SW4BMODE_MASK | MC34708_SW5MODE_MASK,
82 			SW_MODE_PWMPWM | (SW_MODE_PWMPWM << 6u) |
83 			(SW_MODE_PWMPWM << 12u) | (SW_MODE_PWMPWM << 18u));
84 
85 	return 0;
86 }
87 
88 static struct dm_pmic_ops mc34708_ops = {
89 	.reg_count = mc34708_reg_count,
90 	.read	= mc34708_read,
91 	.write	= mc34708_write,
92 };
93 
94 static const struct udevice_id mc34708_ids[] = {
95 	{ .compatible = "fsl,mc34708" },
96 	{ }
97 };
98 
99 U_BOOT_DRIVER(pmic_mc34708) = {
100 	.name		= "mc34708_pmic",
101 	.id		= UCLASS_PMIC,
102 	.of_match	= mc34708_ids,
103 	.probe          = mc34708_probe,
104 	.ops		= &mc34708_ops,
105 };
106