tsadc.c

Go to the documentation of this file.

/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <device/mmio.h>
#include <soc/clock.h>
#include <soc/grf.h>
#include <soc/pmu.h>
#include <soc/tsadc.h>
#include <stdint.h>
 
struct rk3288_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(rk3288_tsadc_regs, auto_period_ht, 0x6c);
 
/* auto_con */
#define LAST_TSHUT      (1 << 24)
#define TSHUT_POL_HIGH  (1 << 8)
#define SRC3_EN         (1 << 7)
#define SRC2_EN         (1 << 6)
#define SRC1_EN         (1 << 5)
#define SRC0_EN         (1 << 4)
#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     10
#define AUTO_DEBOUNCE   4
#define AUTO_PERIOD_HT  10
#define AUTO_DEBOUNCE_HT        4
#define TSADC_CLOCK_HZ          (8 * KHz)
 
/* AD value, correspond to 120 degrees Celsius */
#define TSADC_SHUT_VALUE        3437
 
struct rk3288_tsadc_regs *rk3288_tsadc = (void *)TSADC_BASE;
 
void tsadc_init(void)
{
        rkclk_configure_tsadc(TSADC_CLOCK_HZ);
 
        setbits32(&rk3288_tsadc->auto_con, LAST_TSHUT);
 
        setbits32(&rk3288_tsadc->int_en,
                        TSHUT_CRU_EN_SRC2 | TSHUT_CRU_EN_SRC1 |
                        TSHUT_GPIO_EN_SRC2 | TSHUT_GPIO_EN_SRC1);
 
        write32(&rk3288_tsadc->auto_period, AUTO_PERIOD);
        write32(&rk3288_tsadc->hight_int_debounce, AUTO_DEBOUNCE);
        write32(&rk3288_tsadc->auto_period_ht, AUTO_PERIOD_HT);
        write32(&rk3288_tsadc->hight_tshut_debounce, AUTO_DEBOUNCE_HT);
 
        write32(&rk3288_tsadc->comp1_shut, TSADC_SHUT_VALUE);
        write32(&rk3288_tsadc->comp2_shut, TSADC_SHUT_VALUE);
 
        /* polarity set to high,channel1 for cpu,channel2 for gpu */
        setbits32(&rk3288_tsadc->auto_con, TSHUT_POL_HIGH | SRC2_EN |
                                SRC1_EN | AUTO_EN);
 
        /*
          tsadc iomux must be set after the tshut polarity setting,
          since the tshut polarity default low active,
          so if you enable tsadc iomux,it will output high
         */
        setbits32(&rk3288_pmu->iomux_tsadc_int, IOMUX_TSADC_INT);
}