1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2011 Samsung Electronics
4 * Lukasz Majewski <l.majewski@samsung.com>
5 *
6 * (C) Copyright 2010
7 * Stefano Babic, DENX Software Engineering, sbabic@denx.de
8 *
9 * (C) Copyright 2008-2009 Freescale Semiconductor, Inc.
10 */
11
12 #include <common.h>
13 #include <linux/types.h>
14 #include <power/pmic.h>
15 #include <spi.h>
16
17 static struct spi_slave *slave;
18
pmic_reg(struct pmic * p,u32 reg,u32 * val,u32 write)19 static u32 pmic_reg(struct pmic *p, u32 reg, u32 *val, u32 write)
20 {
21 u32 pmic_tx, pmic_rx;
22 u32 tmp;
23
24 if (!slave) {
25 slave = spi_setup_slave(p->bus, p->hw.spi.cs, p->hw.spi.clk,
26 p->hw.spi.mode);
27
28 if (!slave)
29 return -ENODEV;
30 }
31
32 if (check_reg(p, reg))
33 return -EINVAL;
34
35 if (spi_claim_bus(slave))
36 return -EBUSY;
37
38 pmic_tx = p->hw.spi.prepare_tx(reg, val, write);
39
40 tmp = cpu_to_be32(pmic_tx);
41
42 if (spi_xfer(slave, pmic_spi_bitlen, &tmp, &pmic_rx,
43 pmic_spi_flags))
44 goto err;
45
46 if (write) {
47 pmic_tx = p->hw.spi.prepare_tx(reg, val, 0);
48 tmp = cpu_to_be32(pmic_tx);
49 if (spi_xfer(slave, pmic_spi_bitlen, &tmp, &pmic_rx,
50 pmic_spi_flags))
51 goto err;
52 }
53
54 spi_release_bus(slave);
55 *val = cpu_to_be32(pmic_rx);
56
57 return 0;
58
59 err:
60 spi_release_bus(slave);
61 return -ENOTSUPP;
62 }
63
pmic_reg_write(struct pmic * p,u32 reg,u32 val)64 int pmic_reg_write(struct pmic *p, u32 reg, u32 val)
65 {
66 return pmic_reg(p, reg, &val, 1);
67 }
68
pmic_reg_read(struct pmic * p,u32 reg,u32 * val)69 int pmic_reg_read(struct pmic *p, u32 reg, u32 *val)
70 {
71 return pmic_reg(p, reg, val, 0);
72 }
73