360 lines
10 KiB
C
360 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* The RTC driver for Sunplus SP7021
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*
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* Copyright (C) 2019 Sunplus Technology Inc., All rights reseerved.
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*/
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#include <linux/bitfield.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/ktime.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/reset.h>
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#include <linux/rtc.h>
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#define RTC_REG_NAME "rtc"
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#define RTC_CTRL 0x40
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#define TIMER_FREEZE_MASK_BIT BIT(5 + 16)
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#define TIMER_FREEZE BIT(5)
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#define DIS_SYS_RST_RTC_MASK_BIT BIT(4 + 16)
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#define DIS_SYS_RST_RTC BIT(4)
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#define RTC32K_MODE_RESET_MASK_BIT BIT(3 + 16)
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#define RTC32K_MODE_RESET BIT(3)
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#define ALARM_EN_OVERDUE_MASK_BIT BIT(2 + 16)
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#define ALARM_EN_OVERDUE BIT(2)
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#define ALARM_EN_PMC_MASK_BIT BIT(1 + 16)
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#define ALARM_EN_PMC BIT(1)
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#define ALARM_EN_MASK_BIT BIT(0 + 16)
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#define ALARM_EN BIT(0)
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#define RTC_TIMER_OUT 0x44
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#define RTC_DIVIDER 0x48
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#define RTC_TIMER_SET 0x4c
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#define RTC_ALARM_SET 0x50
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#define RTC_USER_DATA 0x54
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#define RTC_RESET_RECORD 0x58
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#define RTC_BATT_CHARGE_CTRL 0x5c
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#define BAT_CHARGE_RSEL_MASK_BIT GENMASK(3 + 16, 2 + 16)
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#define BAT_CHARGE_RSEL_MASK GENMASK(3, 2)
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#define BAT_CHARGE_RSEL_2K_OHM FIELD_PREP(BAT_CHARGE_RSEL_MASK, 0)
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#define BAT_CHARGE_RSEL_250_OHM FIELD_PREP(BAT_CHARGE_RSEL_MASK, 1)
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#define BAT_CHARGE_RSEL_50_OHM FIELD_PREP(BAT_CHARGE_RSEL_MASK, 2)
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#define BAT_CHARGE_RSEL_0_OHM FIELD_PREP(BAT_CHARGE_RSEL_MASK, 3)
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#define BAT_CHARGE_DSEL_MASK_BIT BIT(1 + 16)
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#define BAT_CHARGE_DSEL_MASK GENMASK(1, 1)
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#define BAT_CHARGE_DSEL_ON FIELD_PREP(BAT_CHARGE_DSEL_MASK, 0)
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#define BAT_CHARGE_DSEL_OFF FIELD_PREP(BAT_CHARGE_DSEL_MASK, 1)
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#define BAT_CHARGE_EN_MASK_BIT BIT(0 + 16)
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#define BAT_CHARGE_EN BIT(0)
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#define RTC_TRIM_CTRL 0x60
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struct sunplus_rtc {
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struct rtc_device *rtc;
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struct resource *res;
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struct clk *rtcclk;
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struct reset_control *rstc;
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void __iomem *reg_base;
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int irq;
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};
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static void sp_get_seconds(struct device *dev, unsigned long *secs)
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{
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struct sunplus_rtc *sp_rtc = dev_get_drvdata(dev);
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*secs = (unsigned long)readl(sp_rtc->reg_base + RTC_TIMER_OUT);
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}
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static void sp_set_seconds(struct device *dev, unsigned long secs)
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{
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struct sunplus_rtc *sp_rtc = dev_get_drvdata(dev);
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writel((u32)secs, sp_rtc->reg_base + RTC_TIMER_SET);
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}
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static int sp_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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unsigned long secs;
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sp_get_seconds(dev, &secs);
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rtc_time64_to_tm(secs, tm);
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return 0;
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}
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static int sp_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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unsigned long secs;
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secs = rtc_tm_to_time64(tm);
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dev_dbg(dev, "%s, secs = %lu\n", __func__, secs);
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sp_set_seconds(dev, secs);
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return 0;
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}
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static int sp_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct sunplus_rtc *sp_rtc = dev_get_drvdata(dev);
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unsigned long alarm_time;
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alarm_time = rtc_tm_to_time64(&alrm->time);
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dev_dbg(dev, "%s, alarm_time: %u\n", __func__, (u32)(alarm_time));
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writel((u32)alarm_time, sp_rtc->reg_base + RTC_ALARM_SET);
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return 0;
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}
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static int sp_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct sunplus_rtc *sp_rtc = dev_get_drvdata(dev);
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unsigned int alarm_time;
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alarm_time = readl(sp_rtc->reg_base + RTC_ALARM_SET);
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dev_dbg(dev, "%s, alarm_time: %u\n", __func__, alarm_time);
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if (alarm_time == 0)
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alrm->enabled = 0;
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else
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alrm->enabled = 1;
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rtc_time64_to_tm((unsigned long)(alarm_time), &alrm->time);
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return 0;
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}
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static int sp_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
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{
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struct sunplus_rtc *sp_rtc = dev_get_drvdata(dev);
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if (enabled)
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writel((TIMER_FREEZE_MASK_BIT | DIS_SYS_RST_RTC_MASK_BIT |
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RTC32K_MODE_RESET_MASK_BIT | ALARM_EN_OVERDUE_MASK_BIT |
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ALARM_EN_PMC_MASK_BIT | ALARM_EN_MASK_BIT) |
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(DIS_SYS_RST_RTC | ALARM_EN_OVERDUE | ALARM_EN_PMC | ALARM_EN),
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sp_rtc->reg_base + RTC_CTRL);
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else
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writel((ALARM_EN_OVERDUE_MASK_BIT | ALARM_EN_PMC_MASK_BIT | ALARM_EN_MASK_BIT) |
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0x0, sp_rtc->reg_base + RTC_CTRL);
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return 0;
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}
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static const struct rtc_class_ops sp_rtc_ops = {
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.read_time = sp_rtc_read_time,
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.set_time = sp_rtc_set_time,
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.set_alarm = sp_rtc_set_alarm,
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.read_alarm = sp_rtc_read_alarm,
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.alarm_irq_enable = sp_rtc_alarm_irq_enable,
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};
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static irqreturn_t sp_rtc_irq_handler(int irq, void *dev_id)
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{
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struct platform_device *plat_dev = dev_id;
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struct sunplus_rtc *sp_rtc = dev_get_drvdata(&plat_dev->dev);
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rtc_update_irq(sp_rtc->rtc, 1, RTC_IRQF | RTC_AF);
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dev_dbg(&plat_dev->dev, "[RTC] ALARM INT\n");
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return IRQ_HANDLED;
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}
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/*
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* -------------------------------------------------------------------------------------
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* bat_charge_rsel bat_charge_dsel bat_charge_en Remarks
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* x x 0 Disable
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* 0 0 1 0.86mA (2K Ohm with diode)
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* 1 0 1 1.81mA (250 Ohm with diode)
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* 2 0 1 2.07mA (50 Ohm with diode)
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* 3 0 1 16.0mA (0 Ohm with diode)
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* 0 1 1 1.36mA (2K Ohm without diode)
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* 1 1 1 3.99mA (250 Ohm without diode)
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* 2 1 1 4.41mA (50 Ohm without diode)
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* 3 1 1 16.0mA (0 Ohm without diode)
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* -------------------------------------------------------------------------------------
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*/
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static void sp_rtc_set_trickle_charger(struct device dev)
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{
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struct sunplus_rtc *sp_rtc = dev_get_drvdata(&dev);
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u32 ohms, rsel;
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u32 chargeable;
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if (of_property_read_u32(dev.of_node, "trickle-resistor-ohms", &ohms) ||
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of_property_read_u32(dev.of_node, "aux-voltage-chargeable", &chargeable)) {
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dev_warn(&dev, "battery charger disabled\n");
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return;
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}
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switch (ohms) {
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case 2000:
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rsel = BAT_CHARGE_RSEL_2K_OHM;
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break;
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case 250:
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rsel = BAT_CHARGE_RSEL_250_OHM;
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break;
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case 50:
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rsel = BAT_CHARGE_RSEL_50_OHM;
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break;
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case 0:
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rsel = BAT_CHARGE_RSEL_0_OHM;
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break;
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default:
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dev_err(&dev, "invalid charger resistor value (%d)\n", ohms);
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return;
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}
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writel(BAT_CHARGE_RSEL_MASK_BIT | rsel, sp_rtc->reg_base + RTC_BATT_CHARGE_CTRL);
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switch (chargeable) {
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case 0:
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writel(BAT_CHARGE_DSEL_MASK_BIT | BAT_CHARGE_DSEL_OFF,
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sp_rtc->reg_base + RTC_BATT_CHARGE_CTRL);
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break;
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case 1:
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writel(BAT_CHARGE_DSEL_MASK_BIT | BAT_CHARGE_DSEL_ON,
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sp_rtc->reg_base + RTC_BATT_CHARGE_CTRL);
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break;
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default:
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dev_err(&dev, "invalid aux-voltage-chargeable value (%d)\n", chargeable);
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return;
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}
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writel(BAT_CHARGE_EN_MASK_BIT | BAT_CHARGE_EN, sp_rtc->reg_base + RTC_BATT_CHARGE_CTRL);
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}
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static int sp_rtc_probe(struct platform_device *plat_dev)
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{
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struct sunplus_rtc *sp_rtc;
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int ret;
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sp_rtc = devm_kzalloc(&plat_dev->dev, sizeof(*sp_rtc), GFP_KERNEL);
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if (!sp_rtc)
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return -ENOMEM;
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sp_rtc->reg_base = devm_platform_ioremap_resource_byname(plat_dev, RTC_REG_NAME);
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if (IS_ERR(sp_rtc->reg_base))
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return dev_err_probe(&plat_dev->dev, PTR_ERR(sp_rtc->reg_base),
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"%s devm_ioremap_resource fail\n", RTC_REG_NAME);
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dev_dbg(&plat_dev->dev, "res = %pR, reg_base = %p\n",
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sp_rtc->res, sp_rtc->reg_base);
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sp_rtc->irq = platform_get_irq(plat_dev, 0);
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if (sp_rtc->irq < 0)
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return dev_err_probe(&plat_dev->dev, sp_rtc->irq, "platform_get_irq failed\n");
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ret = devm_request_irq(&plat_dev->dev, sp_rtc->irq, sp_rtc_irq_handler,
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IRQF_TRIGGER_RISING, "rtc irq", plat_dev);
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if (ret)
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return dev_err_probe(&plat_dev->dev, ret, "devm_request_irq failed:\n");
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sp_rtc->rtcclk = devm_clk_get(&plat_dev->dev, NULL);
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if (IS_ERR(sp_rtc->rtcclk))
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return dev_err_probe(&plat_dev->dev, PTR_ERR(sp_rtc->rtcclk),
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"devm_clk_get fail\n");
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sp_rtc->rstc = devm_reset_control_get_exclusive(&plat_dev->dev, NULL);
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if (IS_ERR(sp_rtc->rstc))
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return dev_err_probe(&plat_dev->dev, PTR_ERR(sp_rtc->rstc),
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"failed to retrieve reset controller\n");
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ret = clk_prepare_enable(sp_rtc->rtcclk);
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if (ret)
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goto free_clk;
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ret = reset_control_deassert(sp_rtc->rstc);
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if (ret)
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goto free_reset_assert;
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device_init_wakeup(&plat_dev->dev, 1);
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dev_set_drvdata(&plat_dev->dev, sp_rtc);
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sp_rtc->rtc = devm_rtc_allocate_device(&plat_dev->dev);
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if (IS_ERR(sp_rtc->rtc)) {
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ret = PTR_ERR(sp_rtc->rtc);
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goto free_reset_assert;
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}
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sp_rtc->rtc->range_max = U32_MAX;
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sp_rtc->rtc->range_min = 0;
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sp_rtc->rtc->ops = &sp_rtc_ops;
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ret = devm_rtc_register_device(sp_rtc->rtc);
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if (ret)
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goto free_reset_assert;
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/* Setup trickle charger */
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if (plat_dev->dev.of_node)
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sp_rtc_set_trickle_charger(plat_dev->dev);
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/* Keep RTC from system reset */
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writel(DIS_SYS_RST_RTC_MASK_BIT | DIS_SYS_RST_RTC, sp_rtc->reg_base + RTC_CTRL);
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return 0;
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free_reset_assert:
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reset_control_assert(sp_rtc->rstc);
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free_clk:
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clk_disable_unprepare(sp_rtc->rtcclk);
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return ret;
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}
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static void sp_rtc_remove(struct platform_device *plat_dev)
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{
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struct sunplus_rtc *sp_rtc = dev_get_drvdata(&plat_dev->dev);
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device_init_wakeup(&plat_dev->dev, 0);
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reset_control_assert(sp_rtc->rstc);
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clk_disable_unprepare(sp_rtc->rtcclk);
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}
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#ifdef CONFIG_PM_SLEEP
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static int sp_rtc_suspend(struct device *dev)
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{
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struct sunplus_rtc *sp_rtc = dev_get_drvdata(dev);
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if (device_may_wakeup(dev))
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enable_irq_wake(sp_rtc->irq);
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return 0;
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}
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static int sp_rtc_resume(struct device *dev)
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{
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struct sunplus_rtc *sp_rtc = dev_get_drvdata(dev);
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if (device_may_wakeup(dev))
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disable_irq_wake(sp_rtc->irq);
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return 0;
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}
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#endif
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static const struct of_device_id sp_rtc_of_match[] = {
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{ .compatible = "sunplus,sp7021-rtc" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, sp_rtc_of_match);
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static SIMPLE_DEV_PM_OPS(sp_rtc_pm_ops, sp_rtc_suspend, sp_rtc_resume);
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static struct platform_driver sp_rtc_driver = {
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.probe = sp_rtc_probe,
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.remove_new = sp_rtc_remove,
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.driver = {
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.name = "sp7021-rtc",
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.of_match_table = sp_rtc_of_match,
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.pm = &sp_rtc_pm_ops,
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},
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};
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module_platform_driver(sp_rtc_driver);
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MODULE_AUTHOR("Vincent Shih <vincent.sunplus@gmail.com>");
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MODULE_DESCRIPTION("Sunplus RTC driver");
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MODULE_LICENSE("GPL v2");
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