From 0eadd3bd2fcb04f31419511c62c0ffb0d7a64b3d Mon Sep 17 00:00:00 2001 From: handsomeyingyan Date: Sat, 1 May 2021 22:19:43 +0800 Subject: [PATCH 11/17] LS2K: More serial devices in dts --- arch/mips/boot/dts/loongson/loongson2k.dts | 27 +++ drivers/rtc/Kconfig | 11 + drivers/rtc/Makefile | 1 + drivers/rtc/rtc-ls2x.c | 225 +++++++++++++++++++++ 4 files changed, 264 insertions(+) create mode 100644 drivers/rtc/rtc-ls2x.c diff --git a/arch/mips/boot/dts/loongson/loongson2k.dts b/arch/mips/boot/dts/loongson/loongson2k.dts index 547112418..ce6f9b4b5 100644 --- a/arch/mips/boot/dts/loongson/loongson2k.dts +++ b/arch/mips/boot/dts/loongson/loongson2k.dts @@ -41,6 +41,33 @@ no-loopback-test; }; + uart3: serial@1fe00300 { + compatible = "ns16550a"; + reg = <0 0x1fe00300 0 0x8>; + clock-frequency = <125000000>; + interrupt-parent = <&liointc0>; + interrupts = <0 IRQ_TYPE_LEVEL_LOW>; + no-loopback-test; + }; + + uart4: serial@1fe00400 { + compatible = "ns16550a"; + reg = <0 0x1fe00400 0 0x8>; + clock-frequency = <125000000>; + interrupt-parent = <&liointc0>; + interrupts = <1 IRQ_TYPE_LEVEL_LOW>; + no-loopback-test; + }; + + uart5: serial@1fe00500 { + compatible = "ns16550a"; + reg = <0 0x1fe00500 0 0x8>; + clock-frequency = <125000000>; + interrupt-parent = <&liointc0>; + interrupts = <1 IRQ_TYPE_LEVEL_LOW>; + no-loopback-test; + }; + can0: can@1fe00c00{ compatible = "nxp,sja1000"; reg = <0 0x1fe00c00 0 0xff>; diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 33e4ecd6c..741f1f4c2 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -1312,6 +1312,17 @@ 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 CPU_LOONGSON64 + 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 bfb574641..5471a3e79 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 000000000..ddba8fafc --- /dev/null +++ b/drivers/rtc/rtc-ls2x.c @@ -0,0 +1,225 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Loongson-2K/7A RTC driver + * + * Author: WANG Xuerui + * Huacai Chen + * + * Based on the out-of-tree Loongson-2H RTC driver by + * Shaozong Liu , rewritten for mainline. + */ + +#include +#include +#include +#include +#include + +#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,ls2k-rtc" }, + { .compatible = "loongson,ls7a-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"); -- 2.17.1