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Tue, 10 Nov 2026 03:09:58 -0500 (EST) From: =?UTF-8?q?Niklas=20S=C3=B6derlund?= To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Geert Uytterhoeven , Magnus Damm , Richard Cochran , Andrew Lunn , "DavidS. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Vadim Fedorenko , Sergey Shtylyov , linux-renesas-soc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org Cc: =?UTF-8?q?Niklas=20S=C3=B6derlund?= Subject: [PATCH net-next v8 2/3] ptp: Add driver for R-Car Gen4 Date: Tue, 10 Nov 2026 09:07:26 +0100 Message-ID: <20261110080727.2377040-3-niklas.soderlund+renesas@ragnatech.se> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20261110080727.2377040-1-niklas.soderlund+renesas@ragnatech.se> References: <20261110080727.2377040-1-niklas.soderlund+renesas@ragnatech.se> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add driver for the gPTP timer found on R-Car Gen4 devices. The timer is system-wide and shared by different Ethernet devices on each Gen4 platform. The operation of the timer is however not completely in depended of the systems Ethernet devices. - On R-Car S4 is gated by the RSWITCH Ethernet module clock. - On R-Car V4H is gated by the RTSN Ethernet module clock. - On R-Car V4M is gated by its own module clock, the system have neither RTSN or RSWITCH device. But the module clock is the same as RTSN on V4H and the documentation referees to it as tsn (EtherTSN). The gPTP device do have its own register space on all three platforms. But on S4 and V4H it will share its clock and reset property with RSWITCH or RTSN, respectively. Signed-off-by: Niklas Söderlund Reviewed-by: Vadim Fedorenko --- * Changes since v5 - Use pm_runtime_resume_and_get() instead of pm_runtime_get_sync(). * Changes since v4 - Drop mod_devicetable.h include. - Remove clap of register value as .max_adj prevents any overflow. * Changes since v3 - Clamp increment calculated to register limitations. - Check return value of clk_get_rate(). - Disable PM if ptp_clock_register() fails. --- MAINTAINERS | 1 + drivers/ptp/Kconfig | 12 ++ drivers/ptp/Makefile | 1 + drivers/ptp/ptp_rcar_gen4.c | 225 ++++++++++++++++++++++++++++++++++++ 4 files changed, 239 insertions(+) create mode 100644 drivers/ptp/ptp_rcar_gen4.c diff --git a/MAINTAINERS b/MAINTAINERS index 085fedac38ef..d7ad3e1b5295 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -23827,6 +23827,7 @@ M: Niklas Söderlund L: linux-renesas-soc@vger.kernel.org S: Supported F: Documentation/devicetree/bindings/ptp/renesas,rcar-gen4-gptp.yaml +F: drivers/ptp/ptp_rcar_gen4.c RENESAS R-CAR GYROADC DRIVER M: Marek Vasut diff --git a/drivers/ptp/Kconfig b/drivers/ptp/Kconfig index feb50f8cc406..573334a66557 100644 --- a/drivers/ptp/Kconfig +++ b/drivers/ptp/Kconfig @@ -264,4 +264,16 @@ config PTP_NETC_V4_TIMER synchronization. It also supports periodic output signal (e.g. PPS) and external trigger timestamping. +config PTP_RCAR_GEN4 + tristate "Renesas R-Car Gen4 PTP Driver" + depends on ARCH_RENESAS || COMPILE_TEST + depends on PTP_1588_CLOCK + help + This driver adds support for using the Renesas R-Car Gen4 gPTP timer + as a PTP clock, the clock can then be used by Gen4 Ethernet drivers + for PTP time synchronization. + + To compile this driver as a module, choose M here: the module + will be called ptp_rcar_gen4. + endmenu diff --git a/drivers/ptp/Makefile b/drivers/ptp/Makefile index bdc47e284f14..0464a586bed2 100644 --- a/drivers/ptp/Makefile +++ b/drivers/ptp/Makefile @@ -22,3 +22,4 @@ obj-$(CONFIG_PTP_1588_CLOCK_OCP) += ptp_ocp.o obj-$(CONFIG_PTP_DFL_TOD) += ptp_dfl_tod.o obj-$(CONFIG_PTP_S390) += ptp_s390.o obj-$(CONFIG_PTP_NETC_V4_TIMER) += ptp_netc.o +obj-$(CONFIG_PTP_RCAR_GEN4) += ptp_rcar_gen4.o diff --git a/drivers/ptp/ptp_rcar_gen4.c b/drivers/ptp/ptp_rcar_gen4.c new file mode 100644 index 000000000000..e82b6c5abc30 --- /dev/null +++ b/drivers/ptp/ptp_rcar_gen4.c @@ -0,0 +1,225 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Renesas R-Car Gen4 gPTP device driver + * + * Copyright (C) 2026 Renesas Electronics Corporation + * Copyright (C) 2026 Niklas Söderlund + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#define PTPTMEC_REG 0x0010 +#define PTPTMDC_REG 0x0014 +#define PTPTIVC0_REG 0x0020 +#define PTPTOVC00_REG 0x0030 +#define PTPTOVC10_REG 0x0034 +#define PTPTOVC20_REG 0x0038 +#define PTPGPTPTM00_REG 0x0050 +#define PTPGPTPTM10_REG 0x0054 +#define PTPGPTPTM20_REG 0x0058 + +struct ptp_rcar_gen4_priv { + void __iomem *base; + struct clk *clk; + + struct ptp_clock *clock; + struct ptp_clock_info info; + + spinlock_t lock; /* Registers access. */ + s64 default_addend; +}; + +#define ptp_to_priv(ptp) container_of(ptp, struct ptp_rcar_gen4_priv, info) + +static int ptp_rcar_gen4_adjfine(struct ptp_clock_info *ptp, long scaled_ppm) +{ + struct ptp_rcar_gen4_priv *priv = ptp_to_priv(ptp); + s64 addend = priv->default_addend; + bool neg_adj = scaled_ppm < 0; + unsigned long flags; + s64 diff; + + if (neg_adj) + scaled_ppm = -scaled_ppm; + diff = div_s64(addend * scaled_ppm_to_ppb(scaled_ppm), NSEC_PER_SEC); + addend = neg_adj ? addend - diff : addend + diff; + + spin_lock_irqsave(&priv->lock, flags); + iowrite32(addend, priv->base + PTPTIVC0_REG); + spin_unlock_irqrestore(&priv->lock, flags); + + return 0; +} + +static void _ptp_rcar_gen4_gettime(struct ptp_clock_info *ptp, + struct timespec64 *ts) +{ + struct ptp_rcar_gen4_priv *priv = ptp_to_priv(ptp); + + lockdep_assert_held(&priv->lock); + + ts->tv_nsec = ioread32(priv->base + PTPGPTPTM00_REG); + ts->tv_sec = ioread32(priv->base + PTPGPTPTM10_REG) | + ((s64)ioread32(priv->base + PTPGPTPTM20_REG) << 32); +} + +static int ptp_rcar_gen4_gettime(struct ptp_clock_info *ptp, + struct timespec64 *ts) +{ + struct ptp_rcar_gen4_priv *priv = ptp_to_priv(ptp); + unsigned long flags; + + spin_lock_irqsave(&priv->lock, flags); + _ptp_rcar_gen4_gettime(ptp, ts); + spin_unlock_irqrestore(&priv->lock, flags); + + return 0; +} + +static void _ptp_rcar_gen4_settime(struct ptp_clock_info *ptp, + const struct timespec64 *ts) +{ + struct ptp_rcar_gen4_priv *priv = ptp_to_priv(ptp); + + lockdep_assert_held(&priv->lock); + + iowrite32(1, priv->base + PTPTMDC_REG); + iowrite32(0, priv->base + PTPTOVC20_REG); + iowrite32(0, priv->base + PTPTOVC10_REG); + iowrite32(0, priv->base + PTPTOVC00_REG); + iowrite32(1, priv->base + PTPTMEC_REG); + iowrite32(ts->tv_sec >> 32, priv->base + PTPTOVC20_REG); + iowrite32(ts->tv_sec, priv->base + PTPTOVC10_REG); + iowrite32(ts->tv_nsec, priv->base + PTPTOVC00_REG); +} + +static int ptp_rcar_gen4_settime(struct ptp_clock_info *ptp, + const struct timespec64 *ts) +{ + struct ptp_rcar_gen4_priv *priv = ptp_to_priv(ptp); + unsigned long flags; + + spin_lock_irqsave(&priv->lock, flags); + _ptp_rcar_gen4_settime(ptp, ts); + spin_unlock_irqrestore(&priv->lock, flags); + + return 0; +} + +static int ptp_rcar_gen4_adjtime(struct ptp_clock_info *ptp, s64 delta) +{ + struct ptp_rcar_gen4_priv *priv = ptp_to_priv(ptp); + struct timespec64 ts; + unsigned long flags; + s64 now; + + spin_lock_irqsave(&priv->lock, flags); + _ptp_rcar_gen4_gettime(ptp, &ts); + now = ktime_to_ns(timespec64_to_ktime(ts)); + ts = ns_to_timespec64(now + delta); + _ptp_rcar_gen4_settime(ptp, &ts); + spin_unlock_irqrestore(&priv->lock, flags); + + return 0; +} + +static struct ptp_clock_info ptp_rcar_gen4_info = { + .owner = THIS_MODULE, + .name = "R-Car Gen4 gPTP", + .max_adj = 50000000, + .adjfine = ptp_rcar_gen4_adjfine, + .adjtime = ptp_rcar_gen4_adjtime, + .gettime64 = ptp_rcar_gen4_gettime, + .settime64 = ptp_rcar_gen4_settime, +}; + +static int ptp_rcar_gen4_probe(struct platform_device *pdev) +{ + struct ptp_rcar_gen4_priv *priv; + struct device *dev = &pdev->dev; + unsigned long rate; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + platform_set_drvdata(pdev, priv); + + priv->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(priv->base)) + return PTR_ERR(priv->base); + + priv->clk = devm_clk_get(dev, NULL); + if (IS_ERR(priv->clk)) + return PTR_ERR(priv->clk); + + rate = clk_get_rate(priv->clk); + if (!rate) + return -ENODEV; + + spin_lock_init(&priv->lock); + + priv->info = ptp_rcar_gen4_info; + + /* Default timer increment in ns. + * bit[31:27] - integer + * bit[26:0] - decimal + * increment[ns] = perid[ns] * 2^27 => (1ns * 2^27) / rate[hz] + */ + + priv->default_addend = div_s64(1000000000LL << 27, rate); + + pm_runtime_enable(dev); + pm_runtime_resume_and_get(dev); + + iowrite32(priv->default_addend, priv->base + PTPTIVC0_REG); + iowrite32(1, priv->base + PTPTMEC_REG); + + priv->clock = ptp_clock_register(&priv->info, dev); + if (IS_ERR(priv->clock)) { + pm_runtime_put_sync(dev); + pm_runtime_disable(dev); + return PTR_ERR(priv->clock); + } + + return 0; +} + +static void ptp_rcar_gen4_remove(struct platform_device *pdev) +{ + struct ptp_rcar_gen4_priv *priv = platform_get_drvdata(pdev); + struct device *dev = &pdev->dev; + + ptp_clock_unregister(priv->clock); + + iowrite32(1, priv->base + PTPTMDC_REG); + + pm_runtime_put_sync(dev); + pm_runtime_disable(dev); +} + +static const struct of_device_id ptp_rcar_gen4_of_match[] = { + { .compatible = "renesas,rcar-gen4-gptp", }, + { /* Sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, ptp_rcar_gen4_of_match); + +static struct platform_driver ptp_rcar_gen4_driver = { + .driver = { + .name = "ptp-rcar-gen4", + .of_match_table = ptp_rcar_gen4_of_match, + }, + .probe = ptp_rcar_gen4_probe, + .remove = ptp_rcar_gen4_remove, +}; +module_platform_driver(ptp_rcar_gen4_driver); + +MODULE_AUTHOR("Niklas Söderlund"); +MODULE_DESCRIPTION("Renesas R-Car Gen4 gPTP driver"); +MODULE_LICENSE("GPL"); -- 2.55.0