diff options
Diffstat (limited to 'drivers/net/ethernet/renesas/rcar_gen4_ptp.c')
| -rw-r--r-- | drivers/net/ethernet/renesas/rcar_gen4_ptp.c | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/drivers/net/ethernet/renesas/rcar_gen4_ptp.c b/drivers/net/ethernet/renesas/rcar_gen4_ptp.c new file mode 100644 index 0000000000..c007e33c47 --- /dev/null +++ b/drivers/net/ethernet/renesas/rcar_gen4_ptp.c @@ -0,0 +1,181 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Renesas R-Car Gen4 gPTP device driver + * + * Copyright (C) 2022 Renesas Electronics Corporation + */ + +#include <linux/err.h> +#include <linux/etherdevice.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +#include "rcar_gen4_ptp.h" +#define ptp_to_priv(ptp) container_of(ptp, struct rcar_gen4_ptp_private, info) + +static const struct rcar_gen4_ptp_reg_offset s4_offs = { + .enable = PTPTMEC, + .disable = PTPTMDC, + .increment = PTPTIVC0, + .config_t0 = PTPTOVC00, + .config_t1 = PTPTOVC10, + .config_t2 = PTPTOVC20, + .monitor_t0 = PTPGPTPTM00, + .monitor_t1 = PTPGPTPTM10, + .monitor_t2 = PTPGPTPTM20, +}; + +static int rcar_gen4_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm) +{ + struct rcar_gen4_ptp_private *ptp_priv = ptp_to_priv(ptp); + bool neg_adj = scaled_ppm < 0 ? true : false; + s64 addend = ptp_priv->default_addend; + 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; + + iowrite32(addend, ptp_priv->addr + ptp_priv->offs->increment); + + return 0; +} + +/* Caller must hold the lock */ +static void _rcar_gen4_ptp_gettime(struct ptp_clock_info *ptp, + struct timespec64 *ts) +{ + struct rcar_gen4_ptp_private *ptp_priv = ptp_to_priv(ptp); + + ts->tv_nsec = ioread32(ptp_priv->addr + ptp_priv->offs->monitor_t0); + ts->tv_sec = ioread32(ptp_priv->addr + ptp_priv->offs->monitor_t1) | + ((s64)ioread32(ptp_priv->addr + ptp_priv->offs->monitor_t2) << 32); +} + +static int rcar_gen4_ptp_gettime(struct ptp_clock_info *ptp, + struct timespec64 *ts) +{ + struct rcar_gen4_ptp_private *ptp_priv = ptp_to_priv(ptp); + unsigned long flags; + + spin_lock_irqsave(&ptp_priv->lock, flags); + _rcar_gen4_ptp_gettime(ptp, ts); + spin_unlock_irqrestore(&ptp_priv->lock, flags); + + return 0; +} + +/* Caller must hold the lock */ +static void _rcar_gen4_ptp_settime(struct ptp_clock_info *ptp, + const struct timespec64 *ts) +{ + struct rcar_gen4_ptp_private *ptp_priv = ptp_to_priv(ptp); + + iowrite32(1, ptp_priv->addr + ptp_priv->offs->disable); + iowrite32(0, ptp_priv->addr + ptp_priv->offs->config_t2); + iowrite32(0, ptp_priv->addr + ptp_priv->offs->config_t1); + iowrite32(0, ptp_priv->addr + ptp_priv->offs->config_t0); + iowrite32(1, ptp_priv->addr + ptp_priv->offs->enable); + iowrite32(ts->tv_sec >> 32, ptp_priv->addr + ptp_priv->offs->config_t2); + iowrite32(ts->tv_sec, ptp_priv->addr + ptp_priv->offs->config_t1); + iowrite32(ts->tv_nsec, ptp_priv->addr + ptp_priv->offs->config_t0); +} + +static int rcar_gen4_ptp_settime(struct ptp_clock_info *ptp, + const struct timespec64 *ts) +{ + struct rcar_gen4_ptp_private *ptp_priv = ptp_to_priv(ptp); + unsigned long flags; + + spin_lock_irqsave(&ptp_priv->lock, flags); + _rcar_gen4_ptp_settime(ptp, ts); + spin_unlock_irqrestore(&ptp_priv->lock, flags); + + return 0; +} + +static int rcar_gen4_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta) +{ + struct rcar_gen4_ptp_private *ptp_priv = ptp_to_priv(ptp); + struct timespec64 ts; + unsigned long flags; + s64 now; + + spin_lock_irqsave(&ptp_priv->lock, flags); + _rcar_gen4_ptp_gettime(ptp, &ts); + now = ktime_to_ns(timespec64_to_ktime(ts)); + ts = ns_to_timespec64(now + delta); + _rcar_gen4_ptp_settime(ptp, &ts); + spin_unlock_irqrestore(&ptp_priv->lock, flags); + + return 0; +} + +static int rcar_gen4_ptp_enable(struct ptp_clock_info *ptp, + struct ptp_clock_request *rq, int on) +{ + return -EOPNOTSUPP; +} + +static struct ptp_clock_info rcar_gen4_ptp_info = { + .owner = THIS_MODULE, + .name = "rcar_gen4_ptp", + .max_adj = 50000000, + .adjfine = rcar_gen4_ptp_adjfine, + .adjtime = rcar_gen4_ptp_adjtime, + .gettime64 = rcar_gen4_ptp_gettime, + .settime64 = rcar_gen4_ptp_settime, + .enable = rcar_gen4_ptp_enable, +}; + +static void rcar_gen4_ptp_set_offs(struct rcar_gen4_ptp_private *ptp_priv, + enum rcar_gen4_ptp_reg_layout layout) +{ + WARN_ON(layout != RCAR_GEN4_PTP_REG_LAYOUT_S4); + + ptp_priv->offs = &s4_offs; +} + +int rcar_gen4_ptp_register(struct rcar_gen4_ptp_private *ptp_priv, + enum rcar_gen4_ptp_reg_layout layout, u32 clock) +{ + if (ptp_priv->initialized) + return 0; + + spin_lock_init(&ptp_priv->lock); + + rcar_gen4_ptp_set_offs(ptp_priv, layout); + + ptp_priv->default_addend = clock; + iowrite32(ptp_priv->default_addend, ptp_priv->addr + ptp_priv->offs->increment); + ptp_priv->clock = ptp_clock_register(&ptp_priv->info, NULL); + if (IS_ERR(ptp_priv->clock)) + return PTR_ERR(ptp_priv->clock); + + iowrite32(0x01, ptp_priv->addr + ptp_priv->offs->enable); + ptp_priv->initialized = true; + + return 0; +} + +int rcar_gen4_ptp_unregister(struct rcar_gen4_ptp_private *ptp_priv) +{ + iowrite32(1, ptp_priv->addr + ptp_priv->offs->disable); + + return ptp_clock_unregister(ptp_priv->clock); +} + +struct rcar_gen4_ptp_private *rcar_gen4_ptp_alloc(struct platform_device *pdev) +{ + struct rcar_gen4_ptp_private *ptp; + + ptp = devm_kzalloc(&pdev->dev, sizeof(*ptp), GFP_KERNEL); + if (!ptp) + return NULL; + + ptp->info = rcar_gen4_ptp_info; + + return ptp; +} |