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// 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 gen4_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);
s64 addend = ptp_priv->default_addend;
bool neg_adj = scaled_ppm < 0;
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 int rcar_gen4_ptp_set_offs(struct rcar_gen4_ptp_private *ptp_priv,
enum rcar_gen4_ptp_reg_layout layout)
{
if (layout != RCAR_GEN4_PTP_REG_LAYOUT)
return -EINVAL;
ptp_priv->offs = &gen4_offs;
return 0;
}
static s64 rcar_gen4_ptp_rate_to_increment(u32 rate)
{
/* Timer increment in ns.
* bit[31:27] - integer
* bit[26:0] - decimal
* increment[ns] = perid[ns] * 2^27 => (1ns * 2^27) / rate[hz]
*/
return div_s64(1000000000LL << 27, rate);
}
int rcar_gen4_ptp_register(struct rcar_gen4_ptp_private *ptp_priv,
enum rcar_gen4_ptp_reg_layout layout, u32 rate)
{
int ret;
if (ptp_priv->initialized)
return 0;
spin_lock_init(&ptp_priv->lock);
ret = rcar_gen4_ptp_set_offs(ptp_priv, layout);
if (ret)
return ret;
ptp_priv->default_addend = rcar_gen4_ptp_rate_to_increment(rate);
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;
}
EXPORT_SYMBOL_GPL(rcar_gen4_ptp_register);
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);
}
EXPORT_SYMBOL_GPL(rcar_gen4_ptp_unregister);
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;
}
EXPORT_SYMBOL_GPL(rcar_gen4_ptp_alloc);
MODULE_AUTHOR("Yoshihiro Shimoda");
MODULE_DESCRIPTION("Renesas R-Car Gen4 gPTP driver");
MODULE_LICENSE("GPL");
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