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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/net/ethernet/xscale/ptp_ixp46x.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/net/ethernet/xscale/ptp_ixp46x.c')
-rw-r--r-- | drivers/net/ethernet/xscale/ptp_ixp46x.c | 332 |
1 files changed, 332 insertions, 0 deletions
diff --git a/drivers/net/ethernet/xscale/ptp_ixp46x.c b/drivers/net/ethernet/xscale/ptp_ixp46x.c new file mode 100644 index 000000000..9abbdb71e --- /dev/null +++ b/drivers/net/ethernet/xscale/ptp_ixp46x.c @@ -0,0 +1,332 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * PTP 1588 clock using the IXP46X + * + * Copyright (C) 2010 OMICRON electronics GmbH + */ +#include <linux/device.h> +#include <linux/module.h> +#include <linux/mod_devicetable.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/kernel.h> +#include <linux/ptp_clock_kernel.h> +#include <linux/platform_device.h> +#include <linux/soc/ixp4xx/cpu.h> + +#include "ixp46x_ts.h" + +#define DRIVER "ptp_ixp46x" +#define N_EXT_TS 2 + +struct ixp_clock { + struct ixp46x_ts_regs *regs; + struct ptp_clock *ptp_clock; + struct ptp_clock_info caps; + int exts0_enabled; + int exts1_enabled; + int slave_irq; + int master_irq; +}; + +static DEFINE_SPINLOCK(register_lock); + +/* + * Register access functions + */ + +static u64 ixp_systime_read(struct ixp46x_ts_regs *regs) +{ + u64 ns; + u32 lo, hi; + + lo = __raw_readl(®s->systime_lo); + hi = __raw_readl(®s->systime_hi); + + ns = ((u64) hi) << 32; + ns |= lo; + ns <<= TICKS_NS_SHIFT; + + return ns; +} + +static void ixp_systime_write(struct ixp46x_ts_regs *regs, u64 ns) +{ + u32 hi, lo; + + ns >>= TICKS_NS_SHIFT; + hi = ns >> 32; + lo = ns & 0xffffffff; + + __raw_writel(lo, ®s->systime_lo); + __raw_writel(hi, ®s->systime_hi); +} + +/* + * Interrupt service routine + */ + +static irqreturn_t isr(int irq, void *priv) +{ + struct ixp_clock *ixp_clock = priv; + struct ixp46x_ts_regs *regs = ixp_clock->regs; + struct ptp_clock_event event; + u32 ack = 0, lo, hi, val; + + val = __raw_readl(®s->event); + + if (val & TSER_SNS) { + ack |= TSER_SNS; + if (ixp_clock->exts0_enabled) { + hi = __raw_readl(®s->asms_hi); + lo = __raw_readl(®s->asms_lo); + event.type = PTP_CLOCK_EXTTS; + event.index = 0; + event.timestamp = ((u64) hi) << 32; + event.timestamp |= lo; + event.timestamp <<= TICKS_NS_SHIFT; + ptp_clock_event(ixp_clock->ptp_clock, &event); + } + } + + if (val & TSER_SNM) { + ack |= TSER_SNM; + if (ixp_clock->exts1_enabled) { + hi = __raw_readl(®s->amms_hi); + lo = __raw_readl(®s->amms_lo); + event.type = PTP_CLOCK_EXTTS; + event.index = 1; + event.timestamp = ((u64) hi) << 32; + event.timestamp |= lo; + event.timestamp <<= TICKS_NS_SHIFT; + ptp_clock_event(ixp_clock->ptp_clock, &event); + } + } + + if (val & TTIPEND) + ack |= TTIPEND; /* this bit seems to be always set */ + + if (ack) { + __raw_writel(ack, ®s->event); + return IRQ_HANDLED; + } else + return IRQ_NONE; +} + +/* + * PTP clock operations + */ + +static int ptp_ixp_adjfreq(struct ptp_clock_info *ptp, s32 ppb) +{ + u64 adj; + u32 diff, addend; + int neg_adj = 0; + struct ixp_clock *ixp_clock = container_of(ptp, struct ixp_clock, caps); + struct ixp46x_ts_regs *regs = ixp_clock->regs; + + if (ppb < 0) { + neg_adj = 1; + ppb = -ppb; + } + addend = DEFAULT_ADDEND; + adj = addend; + adj *= ppb; + diff = div_u64(adj, 1000000000ULL); + + addend = neg_adj ? addend - diff : addend + diff; + + __raw_writel(addend, ®s->addend); + + return 0; +} + +static int ptp_ixp_adjtime(struct ptp_clock_info *ptp, s64 delta) +{ + s64 now; + unsigned long flags; + struct ixp_clock *ixp_clock = container_of(ptp, struct ixp_clock, caps); + struct ixp46x_ts_regs *regs = ixp_clock->regs; + + spin_lock_irqsave(®ister_lock, flags); + + now = ixp_systime_read(regs); + now += delta; + ixp_systime_write(regs, now); + + spin_unlock_irqrestore(®ister_lock, flags); + + return 0; +} + +static int ptp_ixp_gettime(struct ptp_clock_info *ptp, struct timespec64 *ts) +{ + u64 ns; + unsigned long flags; + struct ixp_clock *ixp_clock = container_of(ptp, struct ixp_clock, caps); + struct ixp46x_ts_regs *regs = ixp_clock->regs; + + spin_lock_irqsave(®ister_lock, flags); + + ns = ixp_systime_read(regs); + + spin_unlock_irqrestore(®ister_lock, flags); + + *ts = ns_to_timespec64(ns); + return 0; +} + +static int ptp_ixp_settime(struct ptp_clock_info *ptp, + const struct timespec64 *ts) +{ + u64 ns; + unsigned long flags; + struct ixp_clock *ixp_clock = container_of(ptp, struct ixp_clock, caps); + struct ixp46x_ts_regs *regs = ixp_clock->regs; + + ns = timespec64_to_ns(ts); + + spin_lock_irqsave(®ister_lock, flags); + + ixp_systime_write(regs, ns); + + spin_unlock_irqrestore(®ister_lock, flags); + + return 0; +} + +static int ptp_ixp_enable(struct ptp_clock_info *ptp, + struct ptp_clock_request *rq, int on) +{ + struct ixp_clock *ixp_clock = container_of(ptp, struct ixp_clock, caps); + + switch (rq->type) { + case PTP_CLK_REQ_EXTTS: + switch (rq->extts.index) { + case 0: + ixp_clock->exts0_enabled = on ? 1 : 0; + break; + case 1: + ixp_clock->exts1_enabled = on ? 1 : 0; + break; + default: + return -EINVAL; + } + return 0; + default: + break; + } + + return -EOPNOTSUPP; +} + +static const struct ptp_clock_info ptp_ixp_caps = { + .owner = THIS_MODULE, + .name = "IXP46X timer", + .max_adj = 66666655, + .n_ext_ts = N_EXT_TS, + .n_pins = 0, + .pps = 0, + .adjfreq = ptp_ixp_adjfreq, + .adjtime = ptp_ixp_adjtime, + .gettime64 = ptp_ixp_gettime, + .settime64 = ptp_ixp_settime, + .enable = ptp_ixp_enable, +}; + +/* module operations */ + +static struct ixp_clock ixp_clock; + +int ixp46x_ptp_find(struct ixp46x_ts_regs *__iomem *regs, int *phc_index) +{ + *regs = ixp_clock.regs; + *phc_index = ptp_clock_index(ixp_clock.ptp_clock); + + if (!ixp_clock.ptp_clock) + return -EPROBE_DEFER; + + return 0; +} +EXPORT_SYMBOL_GPL(ixp46x_ptp_find); + +/* Called from the registered devm action */ +static void ptp_ixp_unregister_action(void *d) +{ + struct ptp_clock *ptp_clock = d; + + ptp_clock_unregister(ptp_clock); + ixp_clock.ptp_clock = NULL; +} + +static int ptp_ixp_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + int ret; + + ixp_clock.regs = devm_platform_ioremap_resource(pdev, 0); + ixp_clock.master_irq = platform_get_irq(pdev, 0); + ixp_clock.slave_irq = platform_get_irq(pdev, 1); + if (IS_ERR(ixp_clock.regs) || + ixp_clock.master_irq < 0 || ixp_clock.slave_irq < 0) + return -ENXIO; + + ixp_clock.caps = ptp_ixp_caps; + + ixp_clock.ptp_clock = ptp_clock_register(&ixp_clock.caps, NULL); + + if (IS_ERR(ixp_clock.ptp_clock)) + return PTR_ERR(ixp_clock.ptp_clock); + + ret = devm_add_action_or_reset(dev, ptp_ixp_unregister_action, + ixp_clock.ptp_clock); + if (ret) { + dev_err(dev, "failed to install clock removal handler\n"); + return ret; + } + + __raw_writel(DEFAULT_ADDEND, &ixp_clock.regs->addend); + __raw_writel(1, &ixp_clock.regs->trgt_lo); + __raw_writel(0, &ixp_clock.regs->trgt_hi); + __raw_writel(TTIPEND, &ixp_clock.regs->event); + + ret = devm_request_irq(dev, ixp_clock.master_irq, isr, + 0, DRIVER, &ixp_clock); + if (ret) + return dev_err_probe(dev, ret, + "request_irq failed for irq %d\n", + ixp_clock.master_irq); + + ret = devm_request_irq(dev, ixp_clock.slave_irq, isr, + 0, DRIVER, &ixp_clock); + if (ret) + return dev_err_probe(dev, ret, + "request_irq failed for irq %d\n", + ixp_clock.slave_irq); + + return 0; +} + +static const struct of_device_id ptp_ixp_match[] = { + { + .compatible = "intel,ixp46x-ptp-timer", + }, + { }, +}; + +static struct platform_driver ptp_ixp_driver = { + .driver = { + .name = "ptp-ixp46x", + .of_match_table = ptp_ixp_match, + .suppress_bind_attrs = true, + }, + .probe = ptp_ixp_probe, +}; +module_platform_driver(ptp_ixp_driver); + +MODULE_AUTHOR("Richard Cochran <richardcochran@gmail.com>"); +MODULE_DESCRIPTION("PTP clock using the IXP46X timer"); +MODULE_LICENSE("GPL"); |