mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-18 18:59:44 +00:00
435a728587
This fixes write access to PMIC registers, the bug was introduced partly in commit 64aac65099 and in commit c9fe76dd91. It was tested on an i.mx31 with a mc13783. Signed-off-by: Helmut Raiger <helmut.raiger@hale.at> Acked-by: Stefano Babic <sbabic@denx.de>
108 lines
2.3 KiB
C
108 lines
2.3 KiB
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.
|
|
*
|
|
* See file CREDITS for list of people who contributed to this
|
|
* project.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; either version 2 of
|
|
* the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
|
|
* MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <linux/types.h>
|
|
#include <pmic.h>
|
|
#include <spi.h>
|
|
|
|
static struct spi_slave *slave;
|
|
|
|
void pmic_spi_free(struct spi_slave *slave)
|
|
{
|
|
if (slave)
|
|
spi_free_slave(slave);
|
|
}
|
|
|
|
struct spi_slave *pmic_spi_probe(struct pmic *p)
|
|
{
|
|
return spi_setup_slave(p->bus,
|
|
p->hw.spi.cs,
|
|
p->hw.spi.clk,
|
|
p->hw.spi.mode);
|
|
}
|
|
|
|
static u32 pmic_reg(struct pmic *p, u32 reg, u32 *val, u32 write)
|
|
{
|
|
u32 pmic_tx, pmic_rx;
|
|
u32 tmp;
|
|
|
|
if (!slave) {
|
|
slave = pmic_spi_probe(p);
|
|
|
|
if (!slave)
|
|
return -1;
|
|
}
|
|
|
|
if (check_reg(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)) {
|
|
spi_release_bus(slave);
|
|
return -1;
|
|
}
|
|
|
|
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)) {
|
|
spi_release_bus(slave);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
spi_release_bus(slave);
|
|
*val = cpu_to_be32(pmic_rx);
|
|
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
}
|