[people/ms/u-boot.git] / drivers / power / power_spi.c

/*
 * Copyright (C) 2011 Samsung Electronics
 * Lukasz Majewski <l.majewski@samsung.com>
 *
 * (C) Copyright 2010
 * Stefano Babic, DENX Software Engineering, sbabic@denx.de
 *
 * (C) Copyright 2008-2009 Freescale Semiconductor, Inc.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <linux/types.h>
#include <power/pmic.h>
#include <spi.h>

static struct spi_slave *slave;

static u32 pmic_reg(struct pmic *p, u32 reg, u32 *val, u32 write)
{
	u32 pmic_tx, pmic_rx;
	u32 tmp;

	if (!slave) {
		slave = spi_setup_slave(p->bus, p->hw.spi.cs, p->hw.spi.clk,
					p->hw.spi.mode);

		if (!slave)
			return -1;
	}

	if (check_reg(p, reg))
		return -1;

	if (spi_claim_bus(slave))
		return -1;

	pmic_tx = p->hw.spi.prepare_tx(reg, val, write);

	tmp = cpu_to_be32(pmic_tx);

	if (spi_xfer(slave, pmic_spi_bitlen, &tmp, &pmic_rx,
			pmic_spi_flags))
		goto err;

	if (write) {
		pmic_tx = p->hw.spi.prepare_tx(reg, val, 0);
		tmp = cpu_to_be32(pmic_tx);
		if (spi_xfer(slave, pmic_spi_bitlen, &tmp, &pmic_rx,
			pmic_spi_flags))
			goto err;
	}

	spi_release_bus(slave);
	*val = cpu_to_be32(pmic_rx);

	return 0;

err:
	spi_release_bus(slave);
	return -1;
}

int pmic_reg_write(struct pmic *p, u32 reg, u32 val)
{
	if (pmic_reg(p, reg, &val, 1))
		return -1;

	return 0;
}

int pmic_reg_read(struct pmic *p, u32 reg, u32 *val)
{
	if (pmic_reg(p, reg, val, 0))
		return -1;

	return 0;
}
Commit	Line	Data
e542b7f0 ŁM	1	/*
	2	* Copyright (C) 2011 Samsung Electronics
	3	* Lukasz Majewski <l.majewski@samsung.com>
	4	*
	5	* (C) Copyright 2010
	6	* Stefano Babic, DENX Software Engineering, sbabic@denx.de
	7	*
	8	* (C) Copyright 2008-2009 Freescale Semiconductor, Inc.
	9	*
1a459660	10	* SPDX-License-Identifier: GPL-2.0+
e542b7f0 ŁM	11	*/
	12
	13	#include <common.h>
	14	#include <linux/types.h>
c7336815	15	#include <power/pmic.h>
e542b7f0 ŁM	16	#include <spi.h>
	17
	18	static struct spi_slave *slave;
	19
e542b7f0 ŁM	20	static u32 pmic_reg(struct pmic p, u32 reg, u32 val, u32 write)
	21	{
	22	u32 pmic_tx, pmic_rx;
	23	u32 tmp;
	24
	25	if (!slave) {
5b471dee TR	26	slave = spi_setup_slave(p->bus, p->hw.spi.cs, p->hw.spi.clk,
5b471dee TR	27	p->hw.spi.mode);
e542b7f0 ŁM	28
	29	if (!slave)
	30	return -1;
	31	}
	32
c7336815	33	if (check_reg(p, reg))
e542b7f0 ŁM	34	return -1;
	35
	36	if (spi_claim_bus(slave))
	37	return -1;
	38
	39	pmic_tx = p->hw.spi.prepare_tx(reg, val, write);
	40
	41	tmp = cpu_to_be32(pmic_tx);
	42
	43	if (spi_xfer(slave, pmic_spi_bitlen, &tmp, &pmic_rx,
5b471dee TR	44	pmic_spi_flags))
5b471dee TR	45	goto err;
e542b7f0 ŁM	46
e542b7f0 ŁM	47	if (write) {
435a7285	48	pmic_tx = p->hw.spi.prepare_tx(reg, val, 0);
e542b7f0 ŁM	49	tmp = cpu_to_be32(pmic_tx);
e542b7f0 ŁM	50	if (spi_xfer(slave, pmic_spi_bitlen, &tmp, &pmic_rx,
5b471dee TR	51	pmic_spi_flags))
5b471dee TR	52	goto err;
e542b7f0 ŁM	53	}
	54
	55	spi_release_bus(slave);
	56	*val = cpu_to_be32(pmic_rx);
	57
	58	return 0;
5b471dee TR	59
	60	err:
	61	spi_release_bus(slave);
	62	return -1;
e542b7f0 ŁM	63	}
	64
	65	int pmic_reg_write(struct pmic *p, u32 reg, u32 val)
	66	{
	67	if (pmic_reg(p, reg, &val, 1))
	68	return -1;
	69
	70	return 0;
	71	}
	72
	73	int pmic_reg_read(struct pmic p, u32 reg, u32 val)
	74	{
	75	if (pmic_reg(p, reg, val, 0))
	76	return -1;
	77
	78	return 0;
	79	}