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333 lines
7.2 KiB
333 lines
7.2 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* PTP 1588 clock using the IXP46X |
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* |
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* Copyright (C) 2010 OMICRON electronics GmbH |
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*/ |
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#include <linux/device.h> |
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#include <linux/module.h> |
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#include <linux/mod_devicetable.h> |
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#include <linux/err.h> |
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#include <linux/init.h> |
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#include <linux/interrupt.h> |
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#include <linux/io.h> |
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#include <linux/irq.h> |
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#include <linux/kernel.h> |
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#include <linux/ptp_clock_kernel.h> |
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#include <linux/platform_device.h> |
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#include <linux/soc/ixp4xx/cpu.h> |
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#include <mach/ixp4xx-regs.h> |
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#include "ixp46x_ts.h" |
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#define DRIVER "ptp_ixp46x" |
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#define N_EXT_TS 2 |
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struct ixp_clock { |
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struct ixp46x_ts_regs *regs; |
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struct ptp_clock *ptp_clock; |
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struct ptp_clock_info caps; |
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int exts0_enabled; |
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int exts1_enabled; |
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int slave_irq; |
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int master_irq; |
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}; |
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static DEFINE_SPINLOCK(register_lock); |
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/* |
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* Register access functions |
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*/ |
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static u64 ixp_systime_read(struct ixp46x_ts_regs *regs) |
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{ |
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u64 ns; |
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u32 lo, hi; |
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lo = __raw_readl(®s->systime_lo); |
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hi = __raw_readl(®s->systime_hi); |
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ns = ((u64) hi) << 32; |
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ns |= lo; |
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ns <<= TICKS_NS_SHIFT; |
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return ns; |
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} |
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static void ixp_systime_write(struct ixp46x_ts_regs *regs, u64 ns) |
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{ |
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u32 hi, lo; |
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ns >>= TICKS_NS_SHIFT; |
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hi = ns >> 32; |
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lo = ns & 0xffffffff; |
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__raw_writel(lo, ®s->systime_lo); |
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__raw_writel(hi, ®s->systime_hi); |
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} |
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/* |
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* Interrupt service routine |
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*/ |
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static irqreturn_t isr(int irq, void *priv) |
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{ |
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struct ixp_clock *ixp_clock = priv; |
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struct ixp46x_ts_regs *regs = ixp_clock->regs; |
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struct ptp_clock_event event; |
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u32 ack = 0, lo, hi, val; |
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val = __raw_readl(®s->event); |
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if (val & TSER_SNS) { |
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ack |= TSER_SNS; |
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if (ixp_clock->exts0_enabled) { |
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hi = __raw_readl(®s->asms_hi); |
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lo = __raw_readl(®s->asms_lo); |
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event.type = PTP_CLOCK_EXTTS; |
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event.index = 0; |
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event.timestamp = ((u64) hi) << 32; |
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event.timestamp |= lo; |
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event.timestamp <<= TICKS_NS_SHIFT; |
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ptp_clock_event(ixp_clock->ptp_clock, &event); |
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} |
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} |
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if (val & TSER_SNM) { |
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ack |= TSER_SNM; |
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if (ixp_clock->exts1_enabled) { |
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hi = __raw_readl(®s->amms_hi); |
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lo = __raw_readl(®s->amms_lo); |
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event.type = PTP_CLOCK_EXTTS; |
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event.index = 1; |
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event.timestamp = ((u64) hi) << 32; |
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event.timestamp |= lo; |
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event.timestamp <<= TICKS_NS_SHIFT; |
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ptp_clock_event(ixp_clock->ptp_clock, &event); |
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} |
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} |
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if (val & TTIPEND) |
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ack |= TTIPEND; /* this bit seems to be always set */ |
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if (ack) { |
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__raw_writel(ack, ®s->event); |
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return IRQ_HANDLED; |
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} else |
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return IRQ_NONE; |
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} |
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/* |
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* PTP clock operations |
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*/ |
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static int ptp_ixp_adjfreq(struct ptp_clock_info *ptp, s32 ppb) |
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{ |
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u64 adj; |
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u32 diff, addend; |
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int neg_adj = 0; |
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struct ixp_clock *ixp_clock = container_of(ptp, struct ixp_clock, caps); |
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struct ixp46x_ts_regs *regs = ixp_clock->regs; |
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if (ppb < 0) { |
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neg_adj = 1; |
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ppb = -ppb; |
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} |
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addend = DEFAULT_ADDEND; |
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adj = addend; |
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adj *= ppb; |
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diff = div_u64(adj, 1000000000ULL); |
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addend = neg_adj ? addend - diff : addend + diff; |
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__raw_writel(addend, ®s->addend); |
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return 0; |
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} |
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static int ptp_ixp_adjtime(struct ptp_clock_info *ptp, s64 delta) |
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{ |
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s64 now; |
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unsigned long flags; |
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struct ixp_clock *ixp_clock = container_of(ptp, struct ixp_clock, caps); |
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struct ixp46x_ts_regs *regs = ixp_clock->regs; |
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spin_lock_irqsave(®ister_lock, flags); |
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now = ixp_systime_read(regs); |
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now += delta; |
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ixp_systime_write(regs, now); |
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spin_unlock_irqrestore(®ister_lock, flags); |
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return 0; |
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} |
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static int ptp_ixp_gettime(struct ptp_clock_info *ptp, struct timespec64 *ts) |
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{ |
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u64 ns; |
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unsigned long flags; |
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struct ixp_clock *ixp_clock = container_of(ptp, struct ixp_clock, caps); |
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struct ixp46x_ts_regs *regs = ixp_clock->regs; |
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spin_lock_irqsave(®ister_lock, flags); |
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ns = ixp_systime_read(regs); |
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spin_unlock_irqrestore(®ister_lock, flags); |
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*ts = ns_to_timespec64(ns); |
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return 0; |
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} |
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static int ptp_ixp_settime(struct ptp_clock_info *ptp, |
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const struct timespec64 *ts) |
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{ |
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u64 ns; |
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unsigned long flags; |
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struct ixp_clock *ixp_clock = container_of(ptp, struct ixp_clock, caps); |
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struct ixp46x_ts_regs *regs = ixp_clock->regs; |
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ns = timespec64_to_ns(ts); |
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spin_lock_irqsave(®ister_lock, flags); |
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ixp_systime_write(regs, ns); |
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spin_unlock_irqrestore(®ister_lock, flags); |
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return 0; |
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} |
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static int ptp_ixp_enable(struct ptp_clock_info *ptp, |
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struct ptp_clock_request *rq, int on) |
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{ |
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struct ixp_clock *ixp_clock = container_of(ptp, struct ixp_clock, caps); |
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switch (rq->type) { |
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case PTP_CLK_REQ_EXTTS: |
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switch (rq->extts.index) { |
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case 0: |
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ixp_clock->exts0_enabled = on ? 1 : 0; |
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break; |
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case 1: |
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ixp_clock->exts1_enabled = on ? 1 : 0; |
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break; |
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default: |
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return -EINVAL; |
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} |
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return 0; |
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default: |
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break; |
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} |
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return -EOPNOTSUPP; |
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} |
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static const struct ptp_clock_info ptp_ixp_caps = { |
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.owner = THIS_MODULE, |
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.name = "IXP46X timer", |
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.max_adj = 66666655, |
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.n_ext_ts = N_EXT_TS, |
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.n_pins = 0, |
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.pps = 0, |
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.adjfreq = ptp_ixp_adjfreq, |
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.adjtime = ptp_ixp_adjtime, |
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.gettime64 = ptp_ixp_gettime, |
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.settime64 = ptp_ixp_settime, |
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.enable = ptp_ixp_enable, |
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}; |
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/* module operations */ |
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static struct ixp_clock ixp_clock; |
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int ixp46x_ptp_find(struct ixp46x_ts_regs *__iomem *regs, int *phc_index) |
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{ |
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*regs = ixp_clock.regs; |
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*phc_index = ptp_clock_index(ixp_clock.ptp_clock); |
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if (!ixp_clock.ptp_clock) |
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return -EPROBE_DEFER; |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(ixp46x_ptp_find); |
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/* Called from the registered devm action */ |
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static void ptp_ixp_unregister_action(void *d) |
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{ |
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struct ptp_clock *ptp_clock = d; |
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ptp_clock_unregister(ptp_clock); |
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ixp_clock.ptp_clock = NULL; |
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} |
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static int ptp_ixp_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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int ret; |
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ixp_clock.regs = devm_platform_ioremap_resource(pdev, 0); |
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ixp_clock.master_irq = platform_get_irq(pdev, 0); |
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ixp_clock.slave_irq = platform_get_irq(pdev, 1); |
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if (IS_ERR(ixp_clock.regs) || |
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!ixp_clock.master_irq || !ixp_clock.slave_irq) |
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return -ENXIO; |
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ixp_clock.caps = ptp_ixp_caps; |
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ixp_clock.ptp_clock = ptp_clock_register(&ixp_clock.caps, NULL); |
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if (IS_ERR(ixp_clock.ptp_clock)) |
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return PTR_ERR(ixp_clock.ptp_clock); |
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ret = devm_add_action_or_reset(dev, ptp_ixp_unregister_action, |
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ixp_clock.ptp_clock); |
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if (ret) { |
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dev_err(dev, "failed to install clock removal handler\n"); |
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return ret; |
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} |
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__raw_writel(DEFAULT_ADDEND, &ixp_clock.regs->addend); |
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__raw_writel(1, &ixp_clock.regs->trgt_lo); |
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__raw_writel(0, &ixp_clock.regs->trgt_hi); |
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__raw_writel(TTIPEND, &ixp_clock.regs->event); |
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ret = devm_request_irq(dev, ixp_clock.master_irq, isr, |
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0, DRIVER, &ixp_clock); |
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if (ret) |
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return dev_err_probe(dev, ret, |
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"request_irq failed for irq %d\n", |
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ixp_clock.master_irq); |
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ret = devm_request_irq(dev, ixp_clock.slave_irq, isr, |
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0, DRIVER, &ixp_clock); |
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if (ret) |
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return dev_err_probe(dev, ret, |
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"request_irq failed for irq %d\n", |
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ixp_clock.slave_irq); |
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return 0; |
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} |
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static const struct of_device_id ptp_ixp_match[] = { |
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{ |
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.compatible = "intel,ixp46x-ptp-timer", |
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}, |
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{ }, |
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}; |
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static struct platform_driver ptp_ixp_driver = { |
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.driver = { |
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.name = "ptp-ixp46x", |
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.of_match_table = ptp_ixp_match, |
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.suppress_bind_attrs = true, |
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}, |
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.probe = ptp_ixp_probe, |
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}; |
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module_platform_driver(ptp_ixp_driver); |
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MODULE_AUTHOR("Richard Cochran <[email protected]>"); |
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MODULE_DESCRIPTION("PTP clock using the IXP46X timer"); |
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MODULE_LICENSE("GPL");
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