rtc: ls2x: Add support for the Loongson-2K/LS7A RTC
ANBZ: #5200
commit 1b733a9ebc upstream.
This RTC module is integrated into the Loongson-2K SoC and the LS7A
bridge chip. This version is almost entirely rewritten to make use of
current kernel API, and it supports both ACPI and DT.
This patch also make CONFIG_RTC_DRV_EFI=m. The purpose of this is to
make rtc-ls2x device to /dev/rtc0.
Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
Signed-off-by: Xuefeng Li <lixuefeng@loongson.cn>
Signed-off-by: Juxin Gao <gaojuxin@loongson.cn>
Signed-off-by: Ming Wang <wangming01@loongson.cn>
Link: https://gitee.com/anolis/cloud-kernel/pulls/1934
This commit is contained in:
Ming Wang
小龙
parent
c933641996
commit
d015ad0ba0
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@ -655,7 +655,8 @@ CONFIG_USB_SERIAL_OPTION=m
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CONFIG_USB_GADGET=y
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CONFIG_INFINIBAND=m
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CONFIG_RTC_CLASS=y
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CONFIG_RTC_DRV_EFI=y
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CONFIG_RTC_DRV_EFI=m
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CONFIG_RTC_DRV_LS2X=y
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CONFIG_DMADEVICES=y
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CONFIG_UIO=m
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CONFIG_UIO_PDRV_GENIRQ=m
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@ -1320,6 +1320,17 @@ config RTC_DRV_CROS_EC
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This driver can also be built as a module. If so, the module
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will be called rtc-cros-ec.
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config RTC_DRV_LS2X
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tristate "Loongson LS2X RTC"
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depends on (ACPI || OF) && MACH_LOONGSON64 || COMPILE_TEST
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select REGMAP_MMIO
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help
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If you say yes here you get support for the RTC on the Loongson-2K
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SoC and LS7A bridge, which first appeared on the Loongson-2H.
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This driver can also be built as a module. If so, the module
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will be called rtc-ls2x.
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comment "on-CPU RTC drivers"
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config RTC_DRV_ASM9260
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@ -88,6 +88,7 @@ obj-$(CONFIG_RTC_DRV_LOONGSON1) += rtc-ls1x.o
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obj-$(CONFIG_RTC_DRV_LP8788) += rtc-lp8788.o
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obj-$(CONFIG_RTC_DRV_LPC24XX) += rtc-lpc24xx.o
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obj-$(CONFIG_RTC_DRV_LPC32XX) += rtc-lpc32xx.o
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obj-$(CONFIG_RTC_DRV_LS2X) += rtc-ls2x.o
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obj-$(CONFIG_RTC_DRV_M41T80) += rtc-m41t80.o
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obj-$(CONFIG_RTC_DRV_M41T93) += rtc-m41t93.o
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obj-$(CONFIG_RTC_DRV_M41T94) += rtc-m41t94.o
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@ -0,0 +1,325 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Loongson-2K/7A RTC driver
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*
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* Based on the original out-of-tree Loongson-2H RTC driver for Linux 2.6.32,
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* by Shaozong Liu <liushaozong@loongson.cn>.
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*
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* Maintained out-of-tree by Huacai Chen <chenhuacai@kernel.org>.
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*
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* Rewritten for mainline by WANG Xuerui <git@xen0n.name>.
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*/
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#include <linux/of.h>
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#include <linux/rtc.h>
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#include <linux/acpi.h>
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#include <linux/regmap.h>
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#include <linux/module.h>
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#include <linux/bitfield.h>
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#include <linux/platform_device.h>
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#define TOY_TRIM_REG 0x20
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#define TOY_WRITE0_REG 0x24
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#define TOY_WRITE1_REG 0x28
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#define TOY_READ0_REG 0x2c
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#define TOY_READ1_REG 0x30
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#define TOY_MATCH0_REG 0x34
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#define TOY_MATCH1_REG 0x38
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#define TOY_MATCH2_REG 0x3c
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#define RTC_CTRL_REG 0x40
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#define RTC_TRIM_REG 0x60
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#define RTC_WRITE0_REG 0x64
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#define RTC_READ0_REG 0x68
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#define RTC_MATCH0_REG 0x6c
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#define RTC_MATCH1_REG 0x70
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#define RTC_MATCH2_REG 0x74
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#define TOY_MON GENMASK(31, 26)
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#define TOY_DAY GENMASK(25, 21)
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#define TOY_HOUR GENMASK(20, 16)
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#define TOY_MIN GENMASK(15, 10)
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#define TOY_SEC GENMASK(9, 4)
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#define TOY_MSEC GENMASK(3, 0)
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#define TOY_MATCH_YEAR GENMASK(31, 26)
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#define TOY_MATCH_MON GENMASK(25, 22)
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#define TOY_MATCH_DAY GENMASK(21, 17)
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#define TOY_MATCH_HOUR GENMASK(16, 12)
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#define TOY_MATCH_MIN GENMASK(11, 6)
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#define TOY_MATCH_SEC GENMASK(5, 0)
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/* ACPI and RTC offset */
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#define ACPI_RTC_OFFSET 0x100
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/* support rtc wakeup */
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#define ACPI_PM1_STS_REG 0x0c
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#define ACPI_PM1_EN_REG 0x10
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#define RTC_EN BIT(10)
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#define RTC_STS BIT(10)
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struct ls2x_rtc_priv {
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struct regmap *regmap;
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spinlock_t rtc_reglock;
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void __iomem *acpi_base;
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struct rtc_device *rtcdev;
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};
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static const struct regmap_config ls2x_rtc_regmap_config = {
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.reg_bits = 32,
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.val_bits = 32,
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.reg_stride = 4,
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};
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struct ls2x_rtc_regs {
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u32 reg0;
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u32 reg1;
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};
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#if defined(CONFIG_ACPI)
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static u32 ls2x_acpi_fix_handler(void *id)
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{
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int ret;
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struct ls2x_rtc_priv *priv = (struct ls2x_rtc_priv *)id;
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spin_lock(&priv->rtc_reglock);
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/* Disable acpi rtc enabled */
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ret = readl(priv->acpi_base + ACPI_PM1_EN_REG) & ~RTC_EN;
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writel(ret, priv->acpi_base + ACPI_PM1_EN_REG);
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/* Clear acpi rtc interrupt Status */
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writel(RTC_STS, priv->acpi_base + ACPI_PM1_STS_REG);
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spin_unlock(&priv->rtc_reglock);
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/*
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* The TOY_MATCH0_REG should be cleared 0 here,
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* otherwise the interrupt cannot be cleared.
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* Because the match condition is still satisfied
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*/
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ret = regmap_write(priv->regmap, TOY_MATCH0_REG, 0);
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if (unlikely(ret))
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return ret;
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return 0;
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}
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#endif
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static inline void ls2x_rtc_regs_to_time(struct ls2x_rtc_regs *regs,
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struct rtc_time *tm)
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{
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tm->tm_year = regs->reg1;
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tm->tm_sec = FIELD_GET(TOY_SEC, regs->reg0);
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tm->tm_min = FIELD_GET(TOY_MIN, regs->reg0);
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tm->tm_hour = FIELD_GET(TOY_HOUR, regs->reg0);
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tm->tm_mday = FIELD_GET(TOY_DAY, regs->reg0);
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tm->tm_mon = FIELD_GET(TOY_MON, regs->reg0) - 1;
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}
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static inline void ls2x_rtc_time_to_regs(struct rtc_time *tm,
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struct ls2x_rtc_regs *regs)
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{
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regs->reg0 = FIELD_PREP(TOY_SEC, tm->tm_sec);
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regs->reg0 |= FIELD_PREP(TOY_MIN, tm->tm_min);
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regs->reg0 |= FIELD_PREP(TOY_HOUR, tm->tm_hour);
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regs->reg0 |= FIELD_PREP(TOY_DAY, tm->tm_mday);
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regs->reg0 |= FIELD_PREP(TOY_MON, tm->tm_mon + 1);
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regs->reg1 = tm->tm_year;
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}
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static inline void ls2x_rtc_alarm_regs_to_time(struct ls2x_rtc_regs *regs,
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struct rtc_time *tm)
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{
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tm->tm_sec = FIELD_GET(TOY_MATCH_SEC, regs->reg0);
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tm->tm_min = FIELD_GET(TOY_MATCH_MIN, regs->reg0);
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tm->tm_hour = FIELD_GET(TOY_MATCH_HOUR, regs->reg0);
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tm->tm_mday = FIELD_GET(TOY_MATCH_DAY, regs->reg0);
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tm->tm_mon = FIELD_GET(TOY_MATCH_MON, regs->reg0) - 1;
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/*
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* The rtc SYS_TOYMATCH0/YEAR bit field is only 6 bits,
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* so it means 63 years at most. Therefore, The RTC alarm
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* years can be set from 1900 to 1963.
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* This causes the initialization of alarm fail during
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* call __rtc_read_alarm. We add 64 years offset to
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* ls2x_rtc_read_alarm. After adding the offset,
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* the RTC alarm clock can be set from 1964 to 2027.
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*/
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tm->tm_year = FIELD_GET(TOY_MATCH_YEAR, regs->reg0) + 64;
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}
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static inline void ls2x_rtc_time_to_alarm_regs(struct rtc_time *tm,
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struct ls2x_rtc_regs *regs)
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{
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regs->reg0 = FIELD_PREP(TOY_MATCH_SEC, tm->tm_sec);
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regs->reg0 |= FIELD_PREP(TOY_MATCH_MIN, tm->tm_min);
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regs->reg0 |= FIELD_PREP(TOY_MATCH_HOUR, tm->tm_hour);
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regs->reg0 |= FIELD_PREP(TOY_MATCH_DAY, tm->tm_mday);
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regs->reg0 |= FIELD_PREP(TOY_MATCH_MON, tm->tm_mon + 1);
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regs->reg0 |= FIELD_PREP(TOY_MATCH_YEAR, tm->tm_year);
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}
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static int ls2x_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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int ret;
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struct ls2x_rtc_regs regs;
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struct ls2x_rtc_priv *priv = dev_get_drvdata(dev);
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ret = regmap_read(priv->regmap, TOY_READ1_REG, ®s.reg1);
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if (unlikely(ret))
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return ret;
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ret = regmap_read(priv->regmap, TOY_READ0_REG, ®s.reg0);
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if (unlikely(ret))
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return ret;
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ls2x_rtc_regs_to_time(®s, tm);
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return 0;
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}
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static int ls2x_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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int ret;
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struct ls2x_rtc_regs regs;
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struct ls2x_rtc_priv *priv = dev_get_drvdata(dev);
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ls2x_rtc_time_to_regs(tm, ®s);
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ret = regmap_write(priv->regmap, TOY_WRITE0_REG, regs.reg0);
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if (unlikely(ret))
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return ret;
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return regmap_write(priv->regmap, TOY_WRITE1_REG, regs.reg1);
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}
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static int ls2x_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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int ret;
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struct ls2x_rtc_regs regs;
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struct ls2x_rtc_priv *priv = dev_get_drvdata(dev);
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ret = regmap_read(priv->regmap, TOY_MATCH0_REG, ®s.reg0);
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if (unlikely(ret))
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return ret;
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ls2x_rtc_alarm_regs_to_time(®s, &alrm->time);
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#if defined(CONFIG_ACPI)
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ret = readl(priv->acpi_base + ACPI_PM1_EN_REG);
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alrm->enabled = !!(ret & RTC_EN);
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#endif
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return 0;
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}
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static int ls2x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct ls2x_rtc_regs regs;
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struct ls2x_rtc_priv *priv = dev_get_drvdata(dev);
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ls2x_rtc_time_to_alarm_regs(&alrm->time, ®s);
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return regmap_write(priv->regmap, TOY_MATCH0_REG, regs.reg0);
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}
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static struct rtc_class_ops ls2x_rtc_ops = {
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.read_time = ls2x_rtc_read_time,
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.set_time = ls2x_rtc_set_time,
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.read_alarm = ls2x_rtc_read_alarm,
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.set_alarm = ls2x_rtc_set_alarm,
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};
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static int ls2x_rtc_probe(struct platform_device *pdev)
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{
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int ret;
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void __iomem *regs;
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struct ls2x_rtc_priv *priv;
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struct device *dev = &pdev->dev;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (unlikely(!priv))
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return -ENOMEM;
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spin_lock_init(&priv->rtc_reglock);
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platform_set_drvdata(pdev, priv);
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regs = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(regs))
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return PTR_ERR(regs);
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priv->regmap = devm_regmap_init_mmio(dev, regs,
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&ls2x_rtc_regmap_config);
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if (IS_ERR(priv->regmap))
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return PTR_ERR(priv->regmap);
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priv->rtcdev = devm_rtc_allocate_device(dev);
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if (IS_ERR(priv->rtcdev))
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return PTR_ERR(priv->rtcdev);
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/* Due to hardware erratum, all years multiple of 4 are considered
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* leap year, so only years 2000 through 2099 are usable.
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*
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* Previous out-of-tree versions of this driver wrote tm_year directly
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* into the year register, so epoch 2000 must be used to preserve
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* semantics on shipped systems.
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*/
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priv->rtcdev->range_min = RTC_TIMESTAMP_BEGIN_2000;
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priv->rtcdev->range_max = RTC_TIMESTAMP_END_2099;
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priv->rtcdev->ops = &ls2x_rtc_ops;
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#ifdef CONFIG_ACPI
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priv->acpi_base = regs - ACPI_RTC_OFFSET;
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acpi_install_fixed_event_handler(ACPI_EVENT_RTC,
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ls2x_acpi_fix_handler, priv);
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#endif
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if (!device_can_wakeup(&pdev->dev))
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device_init_wakeup(dev, 1);
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ret = rtc_register_device(priv->rtcdev);
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if (unlikely(ret))
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return ret;
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/* An offset of -0.9s will call RTC set for wall clock time 10.0 s at 10.9 s */
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priv->rtcdev->set_offset_nsec = -900000000;
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/* If not cause hwclock huang */
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priv->rtcdev->uie_unsupported = 1;
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return ret;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id ls2x_rtc_of_match[] = {
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{ .compatible = "loongson,ls2x-rtc" },
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, ls2x_rtc_of_match);
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#endif
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#ifdef CONFIG_ACPI
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static const struct acpi_device_id ls2x_rtc_acpi_match[] = {
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{"LOON0001"},
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{}
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};
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MODULE_DEVICE_TABLE(acpi, ls2x_rtc_acpi_match);
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#endif
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static struct platform_driver ls2x_rtc_driver = {
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.probe = ls2x_rtc_probe,
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.driver = {
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.name = "ls2x-rtc",
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.of_match_table = of_match_ptr(ls2x_rtc_of_match),
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.acpi_match_table = ACPI_PTR(ls2x_rtc_acpi_match),
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},
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};
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module_platform_driver(ls2x_rtc_driver);
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MODULE_DESCRIPTION("LS2X RTC driver");
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MODULE_AUTHOR("WANG Xuerui");
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MODULE_AUTHOR("Huacai Chen");
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MODULE_AUTHOR("Binbin Zhou");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:ls2x-rtc");
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