1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Freescale i.MX28 Battery measurement init 4 * 5 * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com> 6 * on behalf of DENX Software Engineering GmbH 7 */ 8 9 #include <common.h> 10 #include <config.h> 11 #include <asm/io.h> 12 #include <asm/arch/imx-regs.h> 13 14 #include "mxs_init.h" 15 16 void mxs_lradc_init(void) 17 { 18 struct mxs_lradc_regs *regs = (struct mxs_lradc_regs *)MXS_LRADC_BASE; 19 20 debug("SPL: Initialisating LRADC\n"); 21 22 writel(LRADC_CTRL0_SFTRST, ®s->hw_lradc_ctrl0_clr); 23 writel(LRADC_CTRL0_CLKGATE, ®s->hw_lradc_ctrl0_clr); 24 writel(LRADC_CTRL0_ONCHIP_GROUNDREF, ®s->hw_lradc_ctrl0_clr); 25 26 clrsetbits_le32(®s->hw_lradc_ctrl3, 27 LRADC_CTRL3_CYCLE_TIME_MASK, 28 LRADC_CTRL3_CYCLE_TIME_6MHZ); 29 30 clrsetbits_le32(®s->hw_lradc_ctrl4, 31 LRADC_CTRL4_LRADC7SELECT_MASK | 32 LRADC_CTRL4_LRADC6SELECT_MASK, 33 LRADC_CTRL4_LRADC7SELECT_CHANNEL7 | 34 LRADC_CTRL4_LRADC6SELECT_CHANNEL10); 35 } 36 37 void mxs_lradc_enable_batt_measurement(void) 38 { 39 struct mxs_lradc_regs *regs = (struct mxs_lradc_regs *)MXS_LRADC_BASE; 40 41 debug("SPL: Enabling LRADC battery measurement\n"); 42 43 /* Check if the channel is present at all. */ 44 if (!(readl(®s->hw_lradc_status) & LRADC_STATUS_CHANNEL7_PRESENT)) { 45 debug("SPL: LRADC channel 7 is not present - aborting\n"); 46 return; 47 } 48 49 debug("SPL: LRADC channel 7 is present - configuring\n"); 50 51 writel(LRADC_CTRL1_LRADC7_IRQ_EN, ®s->hw_lradc_ctrl1_clr); 52 writel(LRADC_CTRL1_LRADC7_IRQ, ®s->hw_lradc_ctrl1_clr); 53 54 clrsetbits_le32(®s->hw_lradc_conversion, 55 LRADC_CONVERSION_SCALE_FACTOR_MASK, 56 LRADC_CONVERSION_SCALE_FACTOR_LI_ION); 57 writel(LRADC_CONVERSION_AUTOMATIC, ®s->hw_lradc_conversion_set); 58 59 /* Configure the channel. */ 60 writel((1 << 7) << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET, 61 ®s->hw_lradc_ctrl2_clr); 62 writel(0xffffffff, ®s->hw_lradc_ch7_clr); 63 clrbits_le32(®s->hw_lradc_ch7, LRADC_CH_NUM_SAMPLES_MASK); 64 writel(LRADC_CH_ACCUMULATE, ®s->hw_lradc_ch7_clr); 65 66 /* Schedule the channel. */ 67 writel(1 << 7, ®s->hw_lradc_ctrl0_set); 68 69 /* Start the channel sampling. */ 70 writel(((1 << 7) << LRADC_DELAY_TRIGGER_LRADCS_OFFSET) | 71 ((1 << 3) << LRADC_DELAY_TRIGGER_DELAYS_OFFSET) | 72 100, ®s->hw_lradc_delay3); 73 74 writel(0xffffffff, ®s->hw_lradc_ch7_clr); 75 writel(LRADC_DELAY_KICK, ®s->hw_lradc_delay3_set); 76 77 debug("SPL: LRADC channel 7 configuration complete\n"); 78 } 79