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i.MX28: Add LRADC init to i.MX28 SPL

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This code is part of battery boot support for i.MX28.

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Detlev Zundel <dzu@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Wolfgang Denk <wd@denx.de>
This commit is contained in:
Marek Vasut 2012-05-01 11:09:49 +00:00 committed by Albert ARIBAUD
parent ec4836be6e
commit 3f3255c3d7
4 changed files with 100 additions and 1 deletions
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2
arch/arm/cpu/arm926ejs/mx28/Makefile
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@ -28,7 +28,7 @@ LIB = $(obj)lib$(SOC).o
COBJS = clock.o mx28.o iomux.o timer.o
ifdef CONFIG_SPL_BUILD
COBJS += spl_boot.o spl_mem_init.o spl_power_init.o
COBJS += spl_boot.o spl_lradc_init.o spl_mem_init.o spl_power_init.o
endif
SRCS := $(START:.o=.S) $(COBJS:.o=.c)

3
arch/arm/cpu/arm926ejs/mx28/mx28_init.h
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@ -39,4 +39,7 @@ static inline void mx28_power_wait_pswitch(void) { }
void mx28_mem_init(void);
uint32_t mx28_mem_get_size(void);
void mx28_lradc_init(void);
void mx28_lradc_enable_batt_measurement(void);
#endif /* __M28_INIT_H__ */

86
arch/arm/cpu/arm926ejs/mx28/spl_lradc_init.c Normal file
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@ -0,0 +1,86 @@
/*
* Freescale i.MX28 Battery measurement init
*
* Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
* on behalf of DENX Software Engineering GmbH
*
* 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 <config.h>
#include <asm/io.h>
#include <asm/arch/imx-regs.h>
#include "mx28_init.h"
void mx28_lradc_init(void)
{
struct mx28_lradc_regs *regs = (struct mx28_lradc_regs *)MXS_LRADC_BASE;
writel(LRADC_CTRL0_SFTRST, &regs->hw_lradc_ctrl0_clr);
writel(LRADC_CTRL0_CLKGATE, &regs->hw_lradc_ctrl0_clr);
writel(LRADC_CTRL0_ONCHIP_GROUNDREF, &regs->hw_lradc_ctrl0_clr);
clrsetbits_le32(&regs->hw_lradc_ctrl3,
LRADC_CTRL3_CYCLE_TIME_MASK,
LRADC_CTRL3_CYCLE_TIME_6MHZ);
clrsetbits_le32(&regs->hw_lradc_ctrl4,
LRADC_CTRL4_LRADC7SELECT_MASK |
LRADC_CTRL4_LRADC6SELECT_MASK,
LRADC_CTRL4_LRADC7SELECT_CHANNEL7 |
LRADC_CTRL4_LRADC6SELECT_CHANNEL10);
}
void mx28_lradc_enable_batt_measurement(void)
{
struct mx28_lradc_regs *regs = (struct mx28_lradc_regs *)MXS_LRADC_BASE;
/* Check if the channel is present at all. */
if (!(readl(&regs->hw_lradc_status) & LRADC_STATUS_CHANNEL7_PRESENT))
return;
writel(LRADC_CTRL1_LRADC7_IRQ_EN, &regs->hw_lradc_ctrl1_clr);
writel(LRADC_CTRL1_LRADC7_IRQ, &regs->hw_lradc_ctrl1_clr);
clrsetbits_le32(&regs->hw_lradc_conversion,
LRADC_CONVERSION_SCALE_FACTOR_MASK,
LRADC_CONVERSION_SCALE_FACTOR_LI_ION);
writel(LRADC_CONVERSION_AUTOMATIC, &regs->hw_lradc_conversion_set);
/* Configure the channel. */
writel((1 << 7) << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
&regs->hw_lradc_ctrl2_clr);
writel(0xffffffff, &regs->hw_lradc_ch7_clr);
clrbits_le32(&regs->hw_lradc_ch7, LRADC_CH_NUM_SAMPLES_MASK);
writel(LRADC_CH_ACCUMULATE, &regs->hw_lradc_ch7_clr);
/* Schedule the channel. */
writel(1 << 7, &regs->hw_lradc_ctrl0_set);
/* Start the channel sampling. */
writel(((1 << 7) << LRADC_DELAY_TRIGGER_LRADCS_OFFSET) |
((1 << 3) << LRADC_DELAY_TRIGGER_DELAYS_OFFSET) |
100, &regs->hw_lradc_delay3);
writel(0xffffffff, &regs->hw_lradc_ch7_clr);
writel(LRADC_DELAY_KICK, &regs->hw_lradc_delay3_set);
}

10
arch/arm/cpu/arm926ejs/mx28/spl_power_init.c
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@ -883,6 +883,13 @@ void mx28_power_set_vddd(uint32_t new_target, uint32_t new_brownout)
new_brownout << POWER_VDDDCTRL_BO_OFFSET_OFFSET);
}
void mx28_setup_batt_detect(void)
{
mx28_lradc_init();
mx28_lradc_enable_batt_measurement();
early_delay(10);
}
void mx28_power_init(void)
{
struct mx28_power_regs *power_regs =
@ -892,6 +899,9 @@ void mx28_power_init(void)
mx28_power_clear_auto_restart();
mx28_power_set_linreg();
mx28_power_setup_5v_detect();
mx28_setup_batt_detect();
mx28_power_configure_power_source();
mx28_enable_output_rail_protection();