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