diff options
Diffstat (limited to 'arch/arm/cpu/arm926ejs/mxs/spl_lradc_init.c')
| -rw-r--r-- | arch/arm/cpu/arm926ejs/mxs/spl_lradc_init.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/arch/arm/cpu/arm926ejs/mxs/spl_lradc_init.c b/arch/arm/cpu/arm926ejs/mxs/spl_lradc_init.c new file mode 100644 index 0000000..d90f0a1 --- /dev/null +++ b/arch/arm/cpu/arm926ejs/mxs/spl_lradc_init.c @@ -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 "mxs_init.h" + +void mxs_lradc_init(void) +{ + struct mxs_lradc_regs *regs = (struct mxs_lradc_regs *)MXS_LRADC_BASE; + + writel(LRADC_CTRL0_SFTRST, ®s->hw_lradc_ctrl0_clr); + writel(LRADC_CTRL0_CLKGATE, ®s->hw_lradc_ctrl0_clr); + writel(LRADC_CTRL0_ONCHIP_GROUNDREF, ®s->hw_lradc_ctrl0_clr); + + clrsetbits_le32(®s->hw_lradc_ctrl3, + LRADC_CTRL3_CYCLE_TIME_MASK, + LRADC_CTRL3_CYCLE_TIME_6MHZ); + + clrsetbits_le32(®s->hw_lradc_ctrl4, + LRADC_CTRL4_LRADC7SELECT_MASK | + LRADC_CTRL4_LRADC6SELECT_MASK, + LRADC_CTRL4_LRADC7SELECT_CHANNEL7 | + LRADC_CTRL4_LRADC6SELECT_CHANNEL10); +} + +void mxs_lradc_enable_batt_measurement(void) +{ + struct mxs_lradc_regs *regs = (struct mxs_lradc_regs *)MXS_LRADC_BASE; + + /* Check if the channel is present at all. */ + if (!(readl(®s->hw_lradc_status) & LRADC_STATUS_CHANNEL7_PRESENT)) + return; + + writel(LRADC_CTRL1_LRADC7_IRQ_EN, ®s->hw_lradc_ctrl1_clr); + writel(LRADC_CTRL1_LRADC7_IRQ, ®s->hw_lradc_ctrl1_clr); + + clrsetbits_le32(®s->hw_lradc_conversion, + LRADC_CONVERSION_SCALE_FACTOR_MASK, + LRADC_CONVERSION_SCALE_FACTOR_LI_ION); + writel(LRADC_CONVERSION_AUTOMATIC, ®s->hw_lradc_conversion_set); + + /* Configure the channel. */ + writel((1 << 7) << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET, + ®s->hw_lradc_ctrl2_clr); + writel(0xffffffff, ®s->hw_lradc_ch7_clr); + clrbits_le32(®s->hw_lradc_ch7, LRADC_CH_NUM_SAMPLES_MASK); + writel(LRADC_CH_ACCUMULATE, ®s->hw_lradc_ch7_clr); + + /* Schedule the channel. */ + writel(1 << 7, ®s->hw_lradc_ctrl0_set); + + /* Start the channel sampling. */ + writel(((1 << 7) << LRADC_DELAY_TRIGGER_LRADCS_OFFSET) | + ((1 << 3) << LRADC_DELAY_TRIGGER_DELAYS_OFFSET) | + 100, ®s->hw_lradc_delay3); + + writel(0xffffffff, ®s->hw_lradc_ch7_clr); + + writel(LRADC_DELAY_KICK, ®s->hw_lradc_delay3_set); +} |
