LXR uboot/drivers/power/power

   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
  17static struct spi_slave *slave;
  18
  19static 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
  59err:
  60        spi_release_bus(slave);
  61        return -ENOTSUPP;
  62}
  63
  64int pmic_reg_write(struct pmic *p, u32 reg, u32 val)
  65{
  66        return pmic_reg(p, reg, &val, 1);
  67}
  68
  69int pmic_reg_read(struct pmic *p, u32 reg, u32 *val)
  70{
  71        return pmic_reg(p, reg, val, 0);
  72}
  73