tsadc.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <device/mmio.h>
#include <delay.h>
#include <soc/clock.h>
#include <soc/grf.h>
#include <soc/tsadc.h>
#include <stdint.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 */
        clrbits32(&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 temperature
         *                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 temperature coefficient */
        setbits32(&rk3399_tsadc->auto_con, Q_SEL | SRC0_EN);
        udelay(100);
        setbits32(&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);
}