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/*
* (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 <config.h>
#include <common.h>
#include <spi.h>
#include <asm/errno.h>
#include <linux/types.h>
#include <asm/arch/imx_spi.h>
static u32 pmic_tx, pmic_rx;
/*!
* To read/write to a PMIC register. For write, it does another read for the
* actual register value.
*
* @param reg register number inside the PMIC
* @param val data to be written to the register; don't care for read
* @param write 0 for read; 1 for write
*
* @return the actual data in the PMIC register
*/
u32 pmic_reg(struct spi_slave *slave, u32 reg, u32 val, u32 write)
{
if (!slave)
return 0;
if (reg > 63 || write > 1) {
printf("<reg num> = %d is invalide. Should be less then 63\n",
reg);
return 0;
}
pmic_tx = (write << 31) | (reg << 25) | (val & 0x00FFFFFF);
printf("reg=0x%x, val=0x%08x\n", reg, pmic_tx);
spi_xfer(slave, 4 << 3, (u8 *)&pmic_tx,
(u8 *)&pmic_rx, 0);
if (write) {
pmic_tx &= ~(1 << 31);
spi_xfer(slave, 4 << 3,
(u8 *)&pmic_tx, (u8 *)&pmic_rx, 0);
}
return pmic_rx;
}
void show_pmic_info(struct spi_slave *slave)
{
volatile u32 rev_id;
if (!slave)
return;
rev_id = pmic_reg(slave, 7, 0, 0);
printf("PMIC ID: 0x%08x [Rev: ", rev_id);
switch (rev_id & 0x1F) {
case 0x1:
printf("1.0");
break;
case 0x9:
printf("1.1");
break;
case 0xA:
printf("1.2");
break;
case 0x10:
printf("2.0");
break;
case 0x11:
printf("2.1");
break;
case 0x18:
printf("3.0");
break;
case 0x19:
printf("3.1");
break;
case 0x1A:
printf("3.2");
break;
case 0x2:
printf("3.2A");
break;
case 0x1B:
printf("3.3");
break;
case 0x1D:
printf("3.5");
break;
default:
printf("unknown");
break;
}
printf("]\n");
}
struct spi_slave *spi_pmic_probe()
{
return spi_setup_slave(0, CONFIG_IMX_SPI_PMIC_CS, 2500000, 0);
}
void spi_pmic_free(struct spi_slave *slave)
{
if (slave)
spi_free_slave(slave);
}
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