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/*
* This file is part of the coreboot project.
*
* Copyright 2014 Rockchip Inc.
*
* 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; version 2 of the License.
*
* 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.
*/
#include <arch/io.h>
#include <assert.h>
#include <delay.h>
#include <soc/clock.h>
#include <soc/grf.h>
#include <soc/tsadc.h>
#include <stdint.h>
#include <stdlib.h>
struct rk3399_tsadc_regs {
u32 user_con;
u32 auto_con;
u32 int_en;
u32 int_pd;
u32 reserved0[(0x20 - 0x10) / 4];
u32 data0;
u32 data1;
u32 data2;
u32 data3;
u32 comp0_int;
u32 comp1_int;
u32 comp2_int;
u32 comp3_int;
u32 comp0_shut;
u32 comp1_shut;
u32 comp2_shut;
u32 comp3_shut;
u32 reserved1[(0x60 - 0x50) / 4];
u32 hight_int_debounce;
u32 hight_tshut_debounce;
u32 auto_period;
u32 auto_period_ht;
};
check_member(rk3399_tsadc_regs, auto_period_ht, 0x6c);
/* user_con */
#define ADC_POWER_CTRL (1 << 3)
#define START_MODE (1 << 4)
#define START_SHIFT 5
#define START_MASK 1
#define INTER_PD_SHIFT 6
#define INTER_PD_MASK 0x3f
/* auto_con */
#define LAST_TSHUT (1 << 24)
#define SRC3_EN (1 << 7)
#define SRC2_EN (1 << 6)
#define SRC1_EN (1 << 5)
#define SRC0_EN (1 << 4)
#define Q_SEL (1 << 1)
#define AUTO_EN (1 << 0)
/* int_en */
#define TSHUT_CRU_EN_SRC3 (1 << 11)
#define TSHUT_CRU_EN_SRC2 (1 << 10)
#define TSHUT_CRU_EN_SRC1 (1 << 9)
#define TSHUT_CRU_EN_SRC0 (1 << 8)
#define TSHUT_GPIO_EN_SRC3 (1 << 7)
#define TSHUT_GPIO_EN_SRC2 (1 << 6)
#define TSHUT_GPIO_EN_SRC1 (1 << 5)
#define TSHUT_GPIO_EN_SRC0 (1 << 4)
#define AUTO_PERIOD 187500 /* 250ms */
#define AUTO_DEBOUNCE 4
#define AUTO_PERIOD_HT 37500 /* 50ms */
#define AUTO_DEBOUNCE_HT 4
#define TSADC_CLOCK_HZ (750 * KHz)
/* AD value, correspond to 120 degrees Celsius,
* Please refer shut value table in:
* https://patchwork.kernel.org/patch/8908411/
* A quick ref:
* {573, 60000}, {599, 75000}, {616, 85000}, {633, 95000},
* {642, 100000}, {659, 110000}, {677, 120000}, {685, 125000}
*/
#define TSADC_SHUT_VALUE 677
#define GRF_TSADC_TSEN_PD0_ON RK_SETBITS(0)
#define GRF_TSADC_TSEN_PD0_OFF RK_CLRBITS(0)
#define GRF_SARADC_TSEN_ON RK_SETBITS(0)
struct rk3399_tsadc_regs *rk3399_tsadc = (void *)TSADC_BASE;
void tsadc_init(uint32_t polarity)
{
rkclk_configure_tsadc(TSADC_CLOCK_HZ);
/* tsadc power sequence */
clrbits_le32(&rk3399_tsadc->user_con, ADC_POWER_CTRL);
write32(&rk3399_grf->tsadc_testbit_l, GRF_TSADC_TSEN_PD0_ON);
udelay(50);
write32(&rk3399_grf->tsadc_testbit_l, GRF_TSADC_TSEN_PD0_OFF);
udelay(20);
write32(&rk3399_grf->saradc_testbit, GRF_SARADC_TSEN_ON);
udelay(100);
/* set the tshut polarity */
write32(&rk3399_tsadc->auto_con, polarity);
/* setup the automatic mode:
* AUTO_PERIOD: interleave between every two accessing of TSADC
* AUTO_DEBOUNCE: only generate interrupt or TSHUT when temprature
* is higher than COMP_INT for "debounce" times
* AUTO_PERIOD_HT: the interleave between every two accessing after the
* temperature is higher than COMP_SHUT or COMP_INT
* AUTO_DEBOUNCE_HT: only generate interrupt or TSHUT when temperature
* is higher than COMP_SHUT for "debounce" times.
*/
write32(&rk3399_tsadc->auto_period, AUTO_PERIOD);
write32(&rk3399_tsadc->hight_int_debounce, AUTO_DEBOUNCE);
write32(&rk3399_tsadc->auto_period_ht, AUTO_PERIOD_HT);
write32(&rk3399_tsadc->hight_tshut_debounce, AUTO_DEBOUNCE_HT);
/* Enable the src0, negative temprature coefficient */
setbits_le32(&rk3399_tsadc->auto_con, Q_SEL | SRC0_EN);
udelay(100);
setbits_le32(&rk3399_tsadc->auto_con, AUTO_EN);
write32(&rk3399_tsadc->comp0_shut, TSADC_SHUT_VALUE);
write32(&rk3399_tsadc->int_en, TSHUT_CRU_EN_SRC0 | TSHUT_GPIO_EN_SRC0);
/* Set the tsadc_int pinmux */
write32(&rk3399_pmugrf->tsadc_int, IOMUX_TSADC_INT);
}
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