| Message ID | 20200923075845.360974-2-git@xen0n.name (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | rtc: ls2x: Add support for the Loongson-2K/LS7A RTC | expand |
On 09/23/2020 03:58 PM, WANG Xuerui wrote: > 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. > > Signed-off-by: Huacai Chen <chenhc@lemote.com> > Signed-off-by: WANG Xuerui <git@xen0n.name> > --- > drivers/rtc/Kconfig | 11 ++ > drivers/rtc/Makefile | 1 + > drivers/rtc/rtc-ls2x.c | 225 +++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 237 insertions(+) > create mode 100644 drivers/rtc/rtc-ls2x.c > > diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig > index 48c536acd777..41b96633abf3 100644 > --- a/drivers/rtc/Kconfig > +++ b/drivers/rtc/Kconfig > @@ -1301,6 +1301,17 @@ config RTC_DRV_CROS_EC > This driver can also be built as a module. If so, the module > will be called rtc-cros-ec. > > +config RTC_DRV_LS2X > + tristate "Loongson LS2X RTC" > + depends on MACH_LOONGSON64 || COMPILE_TEST > + select REGMAP_MMIO > + help > + If you say yes here you get support for the RTC on the Loongson-2K > + SoC and LS7A bridge, which first appeared on the Loongson-2H. > + > + This driver can also be built as a module. If so, the module > + will be called rtc-ls2x. > + Hi Xuerui, rtc-ls2x --> rtc-ls2x-ls7a RTC_DRV_LS2X --> RTC_DRV_LS2X_LS7A Loongson LS2X RTC --> Loongson LS2X/LS7A RTC Maybe the related names include ls7a or LS7A is better to reflect the reality? Thanks, Tiezhu > comment "on-CPU RTC drivers" > > config RTC_DRV_ASM9260 > diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile > index 880e08a409c3..ade72f6a2435 100644 > --- a/drivers/rtc/Makefile > +++ b/drivers/rtc/Makefile > @@ -84,6 +84,7 @@ obj-$(CONFIG_RTC_DRV_LOONGSON1) += rtc-ls1x.o > obj-$(CONFIG_RTC_DRV_LP8788) += rtc-lp8788.o > obj-$(CONFIG_RTC_DRV_LPC24XX) += rtc-lpc24xx.o > obj-$(CONFIG_RTC_DRV_LPC32XX) += rtc-lpc32xx.o > +obj-$(CONFIG_RTC_DRV_LS2X) += rtc-ls2x.o > obj-$(CONFIG_RTC_DRV_M41T80) += rtc-m41t80.o > obj-$(CONFIG_RTC_DRV_M41T93) += rtc-m41t93.o > obj-$(CONFIG_RTC_DRV_M41T94) += rtc-m41t94.o > diff --git a/drivers/rtc/rtc-ls2x.c b/drivers/rtc/rtc-ls2x.c > new file mode 100644 > index 000000000000..e49cbaceccc2 > --- /dev/null > +++ b/drivers/rtc/rtc-ls2x.c > @@ -0,0 +1,225 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Loongson-2K/7A RTC driver > + * > + * Based on the out-of-tree Loongson-2H RTC driver for Linux 2.6.32, by > + * Shaozong Liu <liushaozong@loongson.cn>. > + * > + * Maintained out-of-tree by Huacai Chen <chenhc@lemote.com>. > + * > + * Rewritten for mainline by WANG Xuerui <git@xen0n.name>. > + */ > + > +#include <linux/module.h> > +#include <linux/platform_device.h> > +#include <linux/regmap.h> > +#include <linux/rtc.h> > +#include <linux/spinlock.h> > + > +#define TOY_TRIM_REG 0x20 > +#define TOY_WRITE0_REG 0x24 > +#define TOY_WRITE1_REG 0x28 > +#define TOY_READ0_REG 0x2c > +#define TOY_READ1_REG 0x30 > +#define TOY_MATCH0_REG 0x34 > +#define TOY_MATCH1_REG 0x38 > +#define TOY_MATCH2_REG 0x3c > +#define RTC_CTRL_REG 0x40 > +#define RTC_TRIM_REG 0x60 > +#define RTC_WRITE0_REG 0x64 > +#define RTC_READ0_REG 0x68 > +#define RTC_MATCH0_REG 0x6c > +#define RTC_MATCH1_REG 0x70 > +#define RTC_MATCH2_REG 0x74 > + > +#define TOY_MON GENMASK(31, 26) > +#define TOY_MON_SHIFT 26 > +#define TOY_DAY GENMASK(25, 21) > +#define TOY_DAY_SHIFT 21 > +#define TOY_HOUR GENMASK(20, 16) > +#define TOY_HOUR_SHIFT 16 > +#define TOY_MIN GENMASK(15, 10) > +#define TOY_MIN_SHIFT 10 > +#define TOY_SEC GENMASK(9, 4) > +#define TOY_SEC_SHIFT 4 > +#define TOY_MSEC GENMASK(3, 0) > +#define TOY_MSEC_SHIFT 0 > + > +struct ls2x_rtc_priv { > + struct regmap *regmap; > + spinlock_t lock; > +}; > + > +static const struct regmap_config ls2x_rtc_regmap_config = { > + .reg_bits = 32, > + .val_bits = 32, > + .reg_stride = 4, > +}; > + > +struct ls2x_rtc_regs { > + u32 reg0; > + u32 reg1; > +}; > + > +static inline void ls2x_rtc_regs_to_time(struct ls2x_rtc_regs *regs, > + struct rtc_time *tm) > +{ > + tm->tm_year = regs->reg1; > + tm->tm_sec = (regs->reg0 & TOY_SEC) >> TOY_SEC_SHIFT; > + tm->tm_min = (regs->reg0 & TOY_MIN) >> TOY_MIN_SHIFT; > + tm->tm_hour = (regs->reg0 & TOY_HOUR) >> TOY_HOUR_SHIFT; > + tm->tm_mday = (regs->reg0 & TOY_DAY) >> TOY_DAY_SHIFT; > + tm->tm_mon = ((regs->reg0 & TOY_MON) >> TOY_MON_SHIFT) - 1; > +} > + > +static inline void ls2x_rtc_time_to_regs(struct rtc_time *tm, > + struct ls2x_rtc_regs *regs) > +{ > + regs->reg0 = (tm->tm_sec << TOY_SEC_SHIFT) & TOY_SEC; > + regs->reg0 |= (tm->tm_min << TOY_MIN_SHIFT) & TOY_MIN; > + regs->reg0 |= (tm->tm_hour << TOY_HOUR_SHIFT) & TOY_HOUR; > + regs->reg0 |= (tm->tm_mday << TOY_DAY_SHIFT) & TOY_DAY; > + regs->reg0 |= ((tm->tm_mon + 1) << TOY_MON_SHIFT) & TOY_MON; > + regs->reg1 = tm->tm_year; > +} > + > +static int ls2x_rtc_read_time(struct device *dev, struct rtc_time *tm) > +{ > + struct ls2x_rtc_priv *priv = dev_get_drvdata(dev); > + struct ls2x_rtc_regs regs; > + int ret; > + > + spin_lock_irq(&priv->lock); > + > + ret = regmap_read(priv->regmap, TOY_READ1_REG, ®s.reg1); > + if (unlikely(ret)) { > + dev_err(dev, "Failed to read time: %d\n", ret); > + goto fail; > + } > + > + ret = regmap_read(priv->regmap, TOY_READ0_REG, ®s.reg0); > + if (unlikely(ret)) { > + dev_err(dev, "Failed to read time: %d\n", ret); > + goto fail; > + } > + > + spin_unlock_irq(&priv->lock); > + > + ls2x_rtc_regs_to_time(®s, tm); > + > + return 0; > + > +fail: > + spin_unlock_irq(&priv->lock); > + return ret; > +} > + > +static int ls2x_rtc_set_time(struct device *dev, struct rtc_time *tm) > +{ > + struct ls2x_rtc_priv *priv = dev_get_drvdata(dev); > + struct ls2x_rtc_regs regs; > + int ret; > + > + ls2x_rtc_time_to_regs(tm, ®s); > + > + spin_lock_irq(&priv->lock); > + > + ret = regmap_write(priv->regmap, TOY_WRITE0_REG, regs.reg0); > + if (unlikely(ret)) { > + dev_err(dev, "Failed to set time: %d\n", ret); > + goto fail; > + } > + > + ret = regmap_write(priv->regmap, TOY_WRITE1_REG, regs.reg1); > + if (unlikely(ret)) { > + dev_err(dev, "Failed to set time: %d\n", ret); > + goto fail; > + } > + > + spin_unlock_irq(&priv->lock); > + > + return 0; > + > +fail: > + spin_unlock_irq(&priv->lock); > + return ret; > +} > + > +static struct rtc_class_ops ls2x_rtc_ops = { > + .read_time = ls2x_rtc_read_time, > + .set_time = ls2x_rtc_set_time, > +}; > + > +static int ls2x_rtc_probe(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + struct rtc_device *rtc; > + struct ls2x_rtc_priv *priv; > + void __iomem *regs; > + int ret; > + > + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); > + if (unlikely(!priv)) > + return -ENOMEM; > + > + spin_lock_init(&priv->lock); > + platform_set_drvdata(pdev, priv); > + > + regs = devm_platform_ioremap_resource(pdev, 0); > + if (IS_ERR(regs)) { > + ret = PTR_ERR(regs); > + dev_err(dev, "Failed to map rtc registers: %d\n", ret); > + return ret; > + } > + > + priv->regmap = devm_regmap_init_mmio(dev, regs, > + &ls2x_rtc_regmap_config); > + if (IS_ERR(priv->regmap)) { > + ret = PTR_ERR(priv->regmap); > + dev_err(dev, "Failed to init regmap: %d\n", ret); > + return ret; > + } > + > + rtc = devm_rtc_allocate_device(dev); > + if (IS_ERR(rtc)) { > + ret = PTR_ERR(rtc); > + dev_err(dev, "Failed to allocate rtc device: %d\n", ret); > + return ret; > + } > + > + rtc->ops = &ls2x_rtc_ops; > + > + /* Due to hardware erratum, all years multiple of 4 are considered > + * leap year, so only years 2000 through 2099 are usable. > + * > + * Previous out-of-tree versions of this driver wrote tm_year directly > + * into the year register, so epoch 2000 must be used to preserve > + * semantics on shipped systems. > + */ > + rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; > + rtc->range_max = RTC_TIMESTAMP_END_2099; > + > + return rtc_register_device(rtc); > +} > + > +static const struct of_device_id ls2x_rtc_of_match[] = { > + { .compatible = "loongson,ls2x-rtc" }, > + { /* sentinel */ }, > +}; > +MODULE_DEVICE_TABLE(of, ls2x_rtc_of_match); > + > +static struct platform_driver ls2x_rtc_driver = { > + .probe = ls2x_rtc_probe, > + .driver = { > + .name = "ls2x-rtc", > + .of_match_table = of_match_ptr(ls2x_rtc_of_match), > + }, > +}; > + > +module_platform_driver(ls2x_rtc_driver); > + > +MODULE_DESCRIPTION("LS2X RTC driver"); > +MODULE_AUTHOR("WANG Xuerui"); > +MODULE_AUTHOR("Huacai Chen"); > +MODULE_LICENSE("GPL"); > +MODULE_ALIAS("platform:ls2x-rtc");
在 2020/9/23 15:58, WANG Xuerui 写道: > 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. > > Signed-off-by: Huacai Chen <chenhc@lemote.com> > Signed-off-by: WANG Xuerui <git@xen0n.name> Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com> This driver have been out of tree for around 10yrs, thanks for shaping it to mainline quality! - Jiaxun > ---
> rtc-ls2x --> rtc-ls2x-ls7a > RTC_DRV_LS2X --> RTC_DRV_LS2X_LS7A > Loongson LS2X RTC --> Loongson LS2X/LS7A RTC > > Maybe the related names include ls7a or LS7A is better to > reflect the reality? Is there any difference with the rtc IP in loongson 1* SoCs? Regards, Du Huanpeng
Hi Tiezhu, On 2020/9/23 17:54, Tiezhu Yang wrote: > On 09/23/2020 03:58 PM, WANG Xuerui wrote: >> 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. >> >> Signed-off-by: Huacai Chen <chenhc@lemote.com> >> Signed-off-by: WANG Xuerui <git@xen0n.name> >> --- >> drivers/rtc/Kconfig | 11 ++ >> drivers/rtc/Makefile | 1 + >> drivers/rtc/rtc-ls2x.c | 225 +++++++++++++++++++++++++++++++++++++++++ >> 3 files changed, 237 insertions(+) >> create mode 100644 drivers/rtc/rtc-ls2x.c >> >> diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig >> index 48c536acd777..41b96633abf3 100644 >> --- a/drivers/rtc/Kconfig >> +++ b/drivers/rtc/Kconfig >> @@ -1301,6 +1301,17 @@ config RTC_DRV_CROS_EC >> This driver can also be built as a module. If so, the module >> will be called rtc-cros-ec. >> +config RTC_DRV_LS2X >> + tristate "Loongson LS2X RTC" >> + depends on MACH_LOONGSON64 || COMPILE_TEST >> + select REGMAP_MMIO >> + help >> + If you say yes here you get support for the RTC on the >> Loongson-2K >> + SoC and LS7A bridge, which first appeared on the Loongson-2H. >> + >> + This driver can also be built as a module. If so, the module >> + will be called rtc-ls2x. >> + > > Hi Xuerui, > > rtc-ls2x --> rtc-ls2x-ls7a > RTC_DRV_LS2X --> RTC_DRV_LS2X_LS7A > Loongson LS2X RTC --> Loongson LS2X/LS7A RTC > > Maybe the related names include ls7a or LS7A is better to > reflect the reality? > The RTC hardware blocks on Loongson 2H, 2K and LS7A all behave the same, from every public documentation I can find. It is entirely reasonable for a chip to behave like another, so I don't think the naming is a problem on its own. That said, if Loongson could start properly naming and versioning the various peripheral blocks (of which there are already many revisions with different quirks added/fixed), that would be a better way forward. I remember seeing things along the line of "probe PRId" or even "see the identification string on the chip package" in some Loongson FAQ docs, just to probe some quirks, and that surely is not desirable... > Thanks, > Tiezhu > >> comment "on-CPU RTC drivers" >> config RTC_DRV_ASM9260 >> diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile >> index 880e08a409c3..ade72f6a2435 100644 >> --- a/drivers/rtc/Makefile >> +++ b/drivers/rtc/Makefile >> @@ -84,6 +84,7 @@ obj-$(CONFIG_RTC_DRV_LOONGSON1) += rtc-ls1x.o >> obj-$(CONFIG_RTC_DRV_LP8788) += rtc-lp8788.o >> obj-$(CONFIG_RTC_DRV_LPC24XX) += rtc-lpc24xx.o >> obj-$(CONFIG_RTC_DRV_LPC32XX) += rtc-lpc32xx.o >> +obj-$(CONFIG_RTC_DRV_LS2X) += rtc-ls2x.o >> obj-$(CONFIG_RTC_DRV_M41T80) += rtc-m41t80.o >> obj-$(CONFIG_RTC_DRV_M41T93) += rtc-m41t93.o >> obj-$(CONFIG_RTC_DRV_M41T94) += rtc-m41t94.o >> diff --git a/drivers/rtc/rtc-ls2x.c b/drivers/rtc/rtc-ls2x.c >> new file mode 100644 >> index 000000000000..e49cbaceccc2 >> --- /dev/null >> +++ b/drivers/rtc/rtc-ls2x.c >> @@ -0,0 +1,225 @@ >> +// SPDX-License-Identifier: GPL-2.0 >> +/* >> + * Loongson-2K/7A RTC driver >> + * >> + * Based on the out-of-tree Loongson-2H RTC driver for Linux 2.6.32, by >> + * Shaozong Liu <liushaozong@loongson.cn>. >> + * >> + * Maintained out-of-tree by Huacai Chen <chenhc@lemote.com>. >> + * >> + * Rewritten for mainline by WANG Xuerui <git@xen0n.name>. >> + */ >> + >> +#include <linux/module.h> >> +#include <linux/platform_device.h> >> +#include <linux/regmap.h> >> +#include <linux/rtc.h> >> +#include <linux/spinlock.h> >> + >> +#define TOY_TRIM_REG 0x20 >> +#define TOY_WRITE0_REG 0x24 >> +#define TOY_WRITE1_REG 0x28 >> +#define TOY_READ0_REG 0x2c >> +#define TOY_READ1_REG 0x30 >> +#define TOY_MATCH0_REG 0x34 >> +#define TOY_MATCH1_REG 0x38 >> +#define TOY_MATCH2_REG 0x3c >> +#define RTC_CTRL_REG 0x40 >> +#define RTC_TRIM_REG 0x60 >> +#define RTC_WRITE0_REG 0x64 >> +#define RTC_READ0_REG 0x68 >> +#define RTC_MATCH0_REG 0x6c >> +#define RTC_MATCH1_REG 0x70 >> +#define RTC_MATCH2_REG 0x74 >> + >> +#define TOY_MON GENMASK(31, 26) >> +#define TOY_MON_SHIFT 26 >> +#define TOY_DAY GENMASK(25, 21) >> +#define TOY_DAY_SHIFT 21 >> +#define TOY_HOUR GENMASK(20, 16) >> +#define TOY_HOUR_SHIFT 16 >> +#define TOY_MIN GENMASK(15, 10) >> +#define TOY_MIN_SHIFT 10 >> +#define TOY_SEC GENMASK(9, 4) >> +#define TOY_SEC_SHIFT 4 >> +#define TOY_MSEC GENMASK(3, 0) >> +#define TOY_MSEC_SHIFT 0 >> + >> +struct ls2x_rtc_priv { >> + struct regmap *regmap; >> + spinlock_t lock; >> +}; >> + >> +static const struct regmap_config ls2x_rtc_regmap_config = { >> + .reg_bits = 32, >> + .val_bits = 32, >> + .reg_stride = 4, >> +}; >> + >> +struct ls2x_rtc_regs { >> + u32 reg0; >> + u32 reg1; >> +}; >> + >> +static inline void ls2x_rtc_regs_to_time(struct ls2x_rtc_regs *regs, >> + struct rtc_time *tm) >> +{ >> + tm->tm_year = regs->reg1; >> + tm->tm_sec = (regs->reg0 & TOY_SEC) >> TOY_SEC_SHIFT; >> + tm->tm_min = (regs->reg0 & TOY_MIN) >> TOY_MIN_SHIFT; >> + tm->tm_hour = (regs->reg0 & TOY_HOUR) >> TOY_HOUR_SHIFT; >> + tm->tm_mday = (regs->reg0 & TOY_DAY) >> TOY_DAY_SHIFT; >> + tm->tm_mon = ((regs->reg0 & TOY_MON) >> TOY_MON_SHIFT) - 1; >> +} >> + >> +static inline void ls2x_rtc_time_to_regs(struct rtc_time *tm, >> + struct ls2x_rtc_regs *regs) >> +{ >> + regs->reg0 = (tm->tm_sec << TOY_SEC_SHIFT) & TOY_SEC; >> + regs->reg0 |= (tm->tm_min << TOY_MIN_SHIFT) & TOY_MIN; >> + regs->reg0 |= (tm->tm_hour << TOY_HOUR_SHIFT) & TOY_HOUR; >> + regs->reg0 |= (tm->tm_mday << TOY_DAY_SHIFT) & TOY_DAY; >> + regs->reg0 |= ((tm->tm_mon + 1) << TOY_MON_SHIFT) & TOY_MON; >> + regs->reg1 = tm->tm_year; >> +} >> + >> +static int ls2x_rtc_read_time(struct device *dev, struct rtc_time *tm) >> +{ >> + struct ls2x_rtc_priv *priv = dev_get_drvdata(dev); >> + struct ls2x_rtc_regs regs; >> + int ret; >> + >> + spin_lock_irq(&priv->lock); >> + >> + ret = regmap_read(priv->regmap, TOY_READ1_REG, ®s.reg1); >> + if (unlikely(ret)) { >> + dev_err(dev, "Failed to read time: %d\n", ret); >> + goto fail; >> + } >> + >> + ret = regmap_read(priv->regmap, TOY_READ0_REG, ®s.reg0); >> + if (unlikely(ret)) { >> + dev_err(dev, "Failed to read time: %d\n", ret); >> + goto fail; >> + } >> + >> + spin_unlock_irq(&priv->lock); >> + >> + ls2x_rtc_regs_to_time(®s, tm); >> + >> + return 0; >> + >> +fail: >> + spin_unlock_irq(&priv->lock); >> + return ret; >> +} >> + >> +static int ls2x_rtc_set_time(struct device *dev, struct rtc_time *tm) >> +{ >> + struct ls2x_rtc_priv *priv = dev_get_drvdata(dev); >> + struct ls2x_rtc_regs regs; >> + int ret; >> + >> + ls2x_rtc_time_to_regs(tm, ®s); >> + >> + spin_lock_irq(&priv->lock); >> + >> + ret = regmap_write(priv->regmap, TOY_WRITE0_REG, regs.reg0); >> + if (unlikely(ret)) { >> + dev_err(dev, "Failed to set time: %d\n", ret); >> + goto fail; >> + } >> + >> + ret = regmap_write(priv->regmap, TOY_WRITE1_REG, regs.reg1); >> + if (unlikely(ret)) { >> + dev_err(dev, "Failed to set time: %d\n", ret); >> + goto fail; >> + } >> + >> + spin_unlock_irq(&priv->lock); >> + >> + return 0; >> + >> +fail: >> + spin_unlock_irq(&priv->lock); >> + return ret; >> +} >> + >> +static struct rtc_class_ops ls2x_rtc_ops = { >> + .read_time = ls2x_rtc_read_time, >> + .set_time = ls2x_rtc_set_time, >> +}; >> + >> +static int ls2x_rtc_probe(struct platform_device *pdev) >> +{ >> + struct device *dev = &pdev->dev; >> + struct rtc_device *rtc; >> + struct ls2x_rtc_priv *priv; >> + void __iomem *regs; >> + int ret; >> + >> + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); >> + if (unlikely(!priv)) >> + return -ENOMEM; >> + >> + spin_lock_init(&priv->lock); >> + platform_set_drvdata(pdev, priv); >> + >> + regs = devm_platform_ioremap_resource(pdev, 0); >> + if (IS_ERR(regs)) { >> + ret = PTR_ERR(regs); >> + dev_err(dev, "Failed to map rtc registers: %d\n", ret); >> + return ret; >> + } >> + >> + priv->regmap = devm_regmap_init_mmio(dev, regs, >> + &ls2x_rtc_regmap_config); >> + if (IS_ERR(priv->regmap)) { >> + ret = PTR_ERR(priv->regmap); >> + dev_err(dev, "Failed to init regmap: %d\n", ret); >> + return ret; >> + } >> + >> + rtc = devm_rtc_allocate_device(dev); >> + if (IS_ERR(rtc)) { >> + ret = PTR_ERR(rtc); >> + dev_err(dev, "Failed to allocate rtc device: %d\n", ret); >> + return ret; >> + } >> + >> + rtc->ops = &ls2x_rtc_ops; >> + >> + /* Due to hardware erratum, all years multiple of 4 are considered >> + * leap year, so only years 2000 through 2099 are usable. >> + * >> + * Previous out-of-tree versions of this driver wrote tm_year >> directly >> + * into the year register, so epoch 2000 must be used to preserve >> + * semantics on shipped systems. >> + */ >> + rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; >> + rtc->range_max = RTC_TIMESTAMP_END_2099; >> + >> + return rtc_register_device(rtc); >> +} >> + >> +static const struct of_device_id ls2x_rtc_of_match[] = { >> + { .compatible = "loongson,ls2x-rtc" }, >> + { /* sentinel */ }, >> +}; >> +MODULE_DEVICE_TABLE(of, ls2x_rtc_of_match); >> + >> +static struct platform_driver ls2x_rtc_driver = { >> + .probe = ls2x_rtc_probe, >> + .driver = { >> + .name = "ls2x-rtc", >> + .of_match_table = of_match_ptr(ls2x_rtc_of_match), >> + }, >> +}; >> + >> +module_platform_driver(ls2x_rtc_driver); >> + >> +MODULE_DESCRIPTION("LS2X RTC driver"); >> +MODULE_AUTHOR("WANG Xuerui"); >> +MODULE_AUTHOR("Huacai Chen"); >> +MODULE_LICENSE("GPL"); >> +MODULE_ALIAS("platform:ls2x-rtc"); >
(Re-sending, as the original reply inadvertently contained an HTML part and has been blocked by all of the mailing lists.) Hi Huanpeng, On 2020/9/23 22:31, Du Huanpeng wrote: >> rtc-ls2x --> rtc-ls2x-ls7a >> RTC_DRV_LS2X --> RTC_DRV_LS2X_LS7A >> Loongson LS2X RTC --> Loongson LS2X/LS7A RTC >> >> Maybe the related names include ls7a or LS7A is better to >> reflect the reality? > Is there any difference with the rtc IP in loongson 1* SoCs? From a cursory look at 1A and 7A manuals the registers seem to have the same layout. Some registers are marked as "reserved" on the 7A manual while having real meaning on 1A, like the sys_toytrim and sys_rtctrim registers. I am investigating whether the rtc_ls1x driver could be worked to support DT configuration, along with the hardcoded addresses when compiled for Loongson 1A. If so, adding a separate rtc_ls2x may not be necessary, rtc_ls1x would be turned into something like rtc_loongson instead. > > Regards, > Du Huanpeng
On 09/25/2020 02:13 PM, WANG Xuerui wrote: > (Re-sending, as the original reply inadvertently contained an HTML part > and has been blocked by all of the mailing lists.) > > Hi Huanpeng, > > On 2020/9/23 22:31, Du Huanpeng wrote: > >>> rtc-ls2x --> rtc-ls2x-ls7a >>> RTC_DRV_LS2X --> RTC_DRV_LS2X_LS7A >>> Loongson LS2X RTC --> Loongson LS2X/LS7A RTC >>> >>> Maybe the related names include ls7a or LS7A is better to >>> reflect the reality? >> Is there any difference with the rtc IP in loongson 1* SoCs? > From a cursory look at 1A and 7A manuals the registers seem to have the > same layout. Some registers are marked as "reserved" on the 7A manual > while having real meaning on 1A, like the sys_toytrim and sys_rtctrim > registers. > > I am investigating whether the rtc_ls1x driver could be worked to > support DT configuration, along with the hardcoded addresses when > compiled for Loongson 1A. If so, adding a separate rtc_ls2x may not be > necessary, rtc_ls1x would be turned into something like rtc_loongson > instead. Hi Xuerui, This patch series work well on the Loongson 3A3000 and 3A4000 platform used with LS7A bridge chip, both read time and write time are OK. So add: Tested-by: Tiezhu Yang <yangtiezhu@loongson.cn> And also, since the implementation between rtc_ls1x.c and rtc_ls2x.c is different, maybe there is no need to add rtc_loongson.c for the combination of rtc_ls1x.c and rtc_ls2x.c, just leave them as they are. Thanks, Tiezhu
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 48c536acd777..41b96633abf3 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -1301,6 +1301,17 @@ config RTC_DRV_CROS_EC This driver can also be built as a module. If so, the module will be called rtc-cros-ec. +config RTC_DRV_LS2X + tristate "Loongson LS2X RTC" + depends on MACH_LOONGSON64 || COMPILE_TEST + select REGMAP_MMIO + help + If you say yes here you get support for the RTC on the Loongson-2K + SoC and LS7A bridge, which first appeared on the Loongson-2H. + + This driver can also be built as a module. If so, the module + will be called rtc-ls2x. + comment "on-CPU RTC drivers" config RTC_DRV_ASM9260 diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 880e08a409c3..ade72f6a2435 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -84,6 +84,7 @@ obj-$(CONFIG_RTC_DRV_LOONGSON1) += rtc-ls1x.o obj-$(CONFIG_RTC_DRV_LP8788) += rtc-lp8788.o obj-$(CONFIG_RTC_DRV_LPC24XX) += rtc-lpc24xx.o obj-$(CONFIG_RTC_DRV_LPC32XX) += rtc-lpc32xx.o +obj-$(CONFIG_RTC_DRV_LS2X) += rtc-ls2x.o obj-$(CONFIG_RTC_DRV_M41T80) += rtc-m41t80.o obj-$(CONFIG_RTC_DRV_M41T93) += rtc-m41t93.o obj-$(CONFIG_RTC_DRV_M41T94) += rtc-m41t94.o diff --git a/drivers/rtc/rtc-ls2x.c b/drivers/rtc/rtc-ls2x.c new file mode 100644 index 000000000000..e49cbaceccc2 --- /dev/null +++ b/drivers/rtc/rtc-ls2x.c @@ -0,0 +1,225 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Loongson-2K/7A RTC driver + * + * Based on the out-of-tree Loongson-2H RTC driver for Linux 2.6.32, by + * Shaozong Liu <liushaozong@loongson.cn>. + * + * Maintained out-of-tree by Huacai Chen <chenhc@lemote.com>. + * + * Rewritten for mainline by WANG Xuerui <git@xen0n.name>. + */ + +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/rtc.h> +#include <linux/spinlock.h> + +#define TOY_TRIM_REG 0x20 +#define TOY_WRITE0_REG 0x24 +#define TOY_WRITE1_REG 0x28 +#define TOY_READ0_REG 0x2c +#define TOY_READ1_REG 0x30 +#define TOY_MATCH0_REG 0x34 +#define TOY_MATCH1_REG 0x38 +#define TOY_MATCH2_REG 0x3c +#define RTC_CTRL_REG 0x40 +#define RTC_TRIM_REG 0x60 +#define RTC_WRITE0_REG 0x64 +#define RTC_READ0_REG 0x68 +#define RTC_MATCH0_REG 0x6c +#define RTC_MATCH1_REG 0x70 +#define RTC_MATCH2_REG 0x74 + +#define TOY_MON GENMASK(31, 26) +#define TOY_MON_SHIFT 26 +#define TOY_DAY GENMASK(25, 21) +#define TOY_DAY_SHIFT 21 +#define TOY_HOUR GENMASK(20, 16) +#define TOY_HOUR_SHIFT 16 +#define TOY_MIN GENMASK(15, 10) +#define TOY_MIN_SHIFT 10 +#define TOY_SEC GENMASK(9, 4) +#define TOY_SEC_SHIFT 4 +#define TOY_MSEC GENMASK(3, 0) +#define TOY_MSEC_SHIFT 0 + +struct ls2x_rtc_priv { + struct regmap *regmap; + spinlock_t lock; +}; + +static const struct regmap_config ls2x_rtc_regmap_config = { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, +}; + +struct ls2x_rtc_regs { + u32 reg0; + u32 reg1; +}; + +static inline void ls2x_rtc_regs_to_time(struct ls2x_rtc_regs *regs, + struct rtc_time *tm) +{ + tm->tm_year = regs->reg1; + tm->tm_sec = (regs->reg0 & TOY_SEC) >> TOY_SEC_SHIFT; + tm->tm_min = (regs->reg0 & TOY_MIN) >> TOY_MIN_SHIFT; + tm->tm_hour = (regs->reg0 & TOY_HOUR) >> TOY_HOUR_SHIFT; + tm->tm_mday = (regs->reg0 & TOY_DAY) >> TOY_DAY_SHIFT; + tm->tm_mon = ((regs->reg0 & TOY_MON) >> TOY_MON_SHIFT) - 1; +} + +static inline void ls2x_rtc_time_to_regs(struct rtc_time *tm, + struct ls2x_rtc_regs *regs) +{ + regs->reg0 = (tm->tm_sec << TOY_SEC_SHIFT) & TOY_SEC; + regs->reg0 |= (tm->tm_min << TOY_MIN_SHIFT) & TOY_MIN; + regs->reg0 |= (tm->tm_hour << TOY_HOUR_SHIFT) & TOY_HOUR; + regs->reg0 |= (tm->tm_mday << TOY_DAY_SHIFT) & TOY_DAY; + regs->reg0 |= ((tm->tm_mon + 1) << TOY_MON_SHIFT) & TOY_MON; + regs->reg1 = tm->tm_year; +} + +static int ls2x_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + struct ls2x_rtc_priv *priv = dev_get_drvdata(dev); + struct ls2x_rtc_regs regs; + int ret; + + spin_lock_irq(&priv->lock); + + ret = regmap_read(priv->regmap, TOY_READ1_REG, ®s.reg1); + if (unlikely(ret)) { + dev_err(dev, "Failed to read time: %d\n", ret); + goto fail; + } + + ret = regmap_read(priv->regmap, TOY_READ0_REG, ®s.reg0); + if (unlikely(ret)) { + dev_err(dev, "Failed to read time: %d\n", ret); + goto fail; + } + + spin_unlock_irq(&priv->lock); + + ls2x_rtc_regs_to_time(®s, tm); + + return 0; + +fail: + spin_unlock_irq(&priv->lock); + return ret; +} + +static int ls2x_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + struct ls2x_rtc_priv *priv = dev_get_drvdata(dev); + struct ls2x_rtc_regs regs; + int ret; + + ls2x_rtc_time_to_regs(tm, ®s); + + spin_lock_irq(&priv->lock); + + ret = regmap_write(priv->regmap, TOY_WRITE0_REG, regs.reg0); + if (unlikely(ret)) { + dev_err(dev, "Failed to set time: %d\n", ret); + goto fail; + } + + ret = regmap_write(priv->regmap, TOY_WRITE1_REG, regs.reg1); + if (unlikely(ret)) { + dev_err(dev, "Failed to set time: %d\n", ret); + goto fail; + } + + spin_unlock_irq(&priv->lock); + + return 0; + +fail: + spin_unlock_irq(&priv->lock); + return ret; +} + +static struct rtc_class_ops ls2x_rtc_ops = { + .read_time = ls2x_rtc_read_time, + .set_time = ls2x_rtc_set_time, +}; + +static int ls2x_rtc_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct rtc_device *rtc; + struct ls2x_rtc_priv *priv; + void __iomem *regs; + int ret; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (unlikely(!priv)) + return -ENOMEM; + + spin_lock_init(&priv->lock); + platform_set_drvdata(pdev, priv); + + regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(regs)) { + ret = PTR_ERR(regs); + dev_err(dev, "Failed to map rtc registers: %d\n", ret); + return ret; + } + + priv->regmap = devm_regmap_init_mmio(dev, regs, + &ls2x_rtc_regmap_config); + if (IS_ERR(priv->regmap)) { + ret = PTR_ERR(priv->regmap); + dev_err(dev, "Failed to init regmap: %d\n", ret); + return ret; + } + + rtc = devm_rtc_allocate_device(dev); + if (IS_ERR(rtc)) { + ret = PTR_ERR(rtc); + dev_err(dev, "Failed to allocate rtc device: %d\n", ret); + return ret; + } + + rtc->ops = &ls2x_rtc_ops; + + /* Due to hardware erratum, all years multiple of 4 are considered + * leap year, so only years 2000 through 2099 are usable. + * + * Previous out-of-tree versions of this driver wrote tm_year directly + * into the year register, so epoch 2000 must be used to preserve + * semantics on shipped systems. + */ + rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; + rtc->range_max = RTC_TIMESTAMP_END_2099; + + return rtc_register_device(rtc); +} + +static const struct of_device_id ls2x_rtc_of_match[] = { + { .compatible = "loongson,ls2x-rtc" }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, ls2x_rtc_of_match); + +static struct platform_driver ls2x_rtc_driver = { + .probe = ls2x_rtc_probe, + .driver = { + .name = "ls2x-rtc", + .of_match_table = of_match_ptr(ls2x_rtc_of_match), + }, +}; + +module_platform_driver(ls2x_rtc_driver); + +MODULE_DESCRIPTION("LS2X RTC driver"); +MODULE_AUTHOR("WANG Xuerui"); +MODULE_AUTHOR("Huacai Chen"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:ls2x-rtc");