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645 lines
16 KiB
645 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* PTP 1588 clock for Freescale QorIQ 1588 timer |
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* |
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* Copyright (C) 2010 OMICRON electronics GmbH |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/device.h> |
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#include <linux/hrtimer.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/of_platform.h> |
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#include <linux/timex.h> |
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#include <linux/slab.h> |
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#include <linux/clk.h> |
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#include <linux/fsl/ptp_qoriq.h> |
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/* |
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* Register access functions |
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*/ |
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/* Caller must hold ptp_qoriq->lock. */ |
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static u64 tmr_cnt_read(struct ptp_qoriq *ptp_qoriq) |
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{ |
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struct ptp_qoriq_registers *regs = &ptp_qoriq->regs; |
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u64 ns; |
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u32 lo, hi; |
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lo = ptp_qoriq->read(®s->ctrl_regs->tmr_cnt_l); |
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hi = ptp_qoriq->read(®s->ctrl_regs->tmr_cnt_h); |
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ns = ((u64) hi) << 32; |
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ns |= lo; |
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return ns; |
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} |
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/* Caller must hold ptp_qoriq->lock. */ |
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static void tmr_cnt_write(struct ptp_qoriq *ptp_qoriq, u64 ns) |
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{ |
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struct ptp_qoriq_registers *regs = &ptp_qoriq->regs; |
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u32 hi = ns >> 32; |
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u32 lo = ns & 0xffffffff; |
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ptp_qoriq->write(®s->ctrl_regs->tmr_cnt_l, lo); |
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ptp_qoriq->write(®s->ctrl_regs->tmr_cnt_h, hi); |
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} |
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/* Caller must hold ptp_qoriq->lock. */ |
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static void set_alarm(struct ptp_qoriq *ptp_qoriq) |
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{ |
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struct ptp_qoriq_registers *regs = &ptp_qoriq->regs; |
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u64 ns; |
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u32 lo, hi; |
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ns = tmr_cnt_read(ptp_qoriq) + 1500000000ULL; |
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ns = div_u64(ns, 1000000000UL) * 1000000000ULL; |
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ns -= ptp_qoriq->tclk_period; |
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hi = ns >> 32; |
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lo = ns & 0xffffffff; |
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ptp_qoriq->write(®s->alarm_regs->tmr_alarm1_l, lo); |
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ptp_qoriq->write(®s->alarm_regs->tmr_alarm1_h, hi); |
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} |
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/* Caller must hold ptp_qoriq->lock. */ |
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static void set_fipers(struct ptp_qoriq *ptp_qoriq) |
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{ |
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struct ptp_qoriq_registers *regs = &ptp_qoriq->regs; |
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set_alarm(ptp_qoriq); |
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ptp_qoriq->write(®s->fiper_regs->tmr_fiper1, ptp_qoriq->tmr_fiper1); |
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ptp_qoriq->write(®s->fiper_regs->tmr_fiper2, ptp_qoriq->tmr_fiper2); |
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if (ptp_qoriq->fiper3_support) |
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ptp_qoriq->write(®s->fiper_regs->tmr_fiper3, |
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ptp_qoriq->tmr_fiper3); |
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} |
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int extts_clean_up(struct ptp_qoriq *ptp_qoriq, int index, bool update_event) |
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{ |
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struct ptp_qoriq_registers *regs = &ptp_qoriq->regs; |
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struct ptp_clock_event event; |
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void __iomem *reg_etts_l; |
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void __iomem *reg_etts_h; |
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u32 valid, lo, hi; |
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switch (index) { |
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case 0: |
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valid = ETS1_VLD; |
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reg_etts_l = ®s->etts_regs->tmr_etts1_l; |
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reg_etts_h = ®s->etts_regs->tmr_etts1_h; |
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break; |
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case 1: |
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valid = ETS2_VLD; |
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reg_etts_l = ®s->etts_regs->tmr_etts2_l; |
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reg_etts_h = ®s->etts_regs->tmr_etts2_h; |
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break; |
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default: |
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return -EINVAL; |
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} |
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event.type = PTP_CLOCK_EXTTS; |
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event.index = index; |
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if (ptp_qoriq->extts_fifo_support) |
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if (!(ptp_qoriq->read(®s->ctrl_regs->tmr_stat) & valid)) |
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return 0; |
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do { |
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lo = ptp_qoriq->read(reg_etts_l); |
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hi = ptp_qoriq->read(reg_etts_h); |
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if (update_event) { |
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event.timestamp = ((u64) hi) << 32; |
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event.timestamp |= lo; |
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ptp_clock_event(ptp_qoriq->clock, &event); |
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} |
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if (!ptp_qoriq->extts_fifo_support) |
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break; |
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} while (ptp_qoriq->read(®s->ctrl_regs->tmr_stat) & valid); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(extts_clean_up); |
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/* |
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* Interrupt service routine |
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*/ |
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irqreturn_t ptp_qoriq_isr(int irq, void *priv) |
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{ |
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struct ptp_qoriq *ptp_qoriq = priv; |
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struct ptp_qoriq_registers *regs = &ptp_qoriq->regs; |
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struct ptp_clock_event event; |
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u32 ack = 0, mask, val, irqs; |
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spin_lock(&ptp_qoriq->lock); |
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val = ptp_qoriq->read(®s->ctrl_regs->tmr_tevent); |
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mask = ptp_qoriq->read(®s->ctrl_regs->tmr_temask); |
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spin_unlock(&ptp_qoriq->lock); |
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irqs = val & mask; |
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if (irqs & ETS1) { |
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ack |= ETS1; |
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extts_clean_up(ptp_qoriq, 0, true); |
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} |
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if (irqs & ETS2) { |
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ack |= ETS2; |
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extts_clean_up(ptp_qoriq, 1, true); |
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} |
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if (irqs & PP1) { |
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ack |= PP1; |
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event.type = PTP_CLOCK_PPS; |
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ptp_clock_event(ptp_qoriq->clock, &event); |
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} |
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if (ack) { |
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ptp_qoriq->write(®s->ctrl_regs->tmr_tevent, ack); |
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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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EXPORT_SYMBOL_GPL(ptp_qoriq_isr); |
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/* |
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* PTP clock operations |
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*/ |
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int ptp_qoriq_adjfine(struct ptp_clock_info *ptp, long scaled_ppm) |
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{ |
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u64 adj, diff; |
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u32 tmr_add; |
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int neg_adj = 0; |
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struct ptp_qoriq *ptp_qoriq = container_of(ptp, struct ptp_qoriq, caps); |
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struct ptp_qoriq_registers *regs = &ptp_qoriq->regs; |
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if (scaled_ppm < 0) { |
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neg_adj = 1; |
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scaled_ppm = -scaled_ppm; |
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} |
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tmr_add = ptp_qoriq->tmr_add; |
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adj = tmr_add; |
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/* |
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* Calculate diff and round() to the nearest integer |
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* |
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* diff = adj * (ppb / 1000000000) |
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* = adj * scaled_ppm / 65536000000 |
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*/ |
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diff = mul_u64_u64_div_u64(adj, scaled_ppm, 32768000000); |
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diff = DIV64_U64_ROUND_UP(diff, 2); |
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tmr_add = neg_adj ? tmr_add - diff : tmr_add + diff; |
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ptp_qoriq->write(®s->ctrl_regs->tmr_add, tmr_add); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(ptp_qoriq_adjfine); |
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int ptp_qoriq_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 ptp_qoriq *ptp_qoriq = container_of(ptp, struct ptp_qoriq, caps); |
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spin_lock_irqsave(&ptp_qoriq->lock, flags); |
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now = tmr_cnt_read(ptp_qoriq); |
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now += delta; |
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tmr_cnt_write(ptp_qoriq, now); |
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set_fipers(ptp_qoriq); |
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spin_unlock_irqrestore(&ptp_qoriq->lock, flags); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(ptp_qoriq_adjtime); |
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int ptp_qoriq_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 ptp_qoriq *ptp_qoriq = container_of(ptp, struct ptp_qoriq, caps); |
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spin_lock_irqsave(&ptp_qoriq->lock, flags); |
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ns = tmr_cnt_read(ptp_qoriq); |
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spin_unlock_irqrestore(&ptp_qoriq->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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EXPORT_SYMBOL_GPL(ptp_qoriq_gettime); |
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int ptp_qoriq_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 ptp_qoriq *ptp_qoriq = container_of(ptp, struct ptp_qoriq, caps); |
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ns = timespec64_to_ns(ts); |
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spin_lock_irqsave(&ptp_qoriq->lock, flags); |
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tmr_cnt_write(ptp_qoriq, ns); |
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set_fipers(ptp_qoriq); |
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spin_unlock_irqrestore(&ptp_qoriq->lock, flags); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(ptp_qoriq_settime); |
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int ptp_qoriq_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 ptp_qoriq *ptp_qoriq = container_of(ptp, struct ptp_qoriq, caps); |
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struct ptp_qoriq_registers *regs = &ptp_qoriq->regs; |
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unsigned long flags; |
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u32 bit, mask = 0; |
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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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bit = ETS1EN; |
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break; |
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case 1: |
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bit = ETS2EN; |
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break; |
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default: |
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return -EINVAL; |
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} |
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if (on) |
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extts_clean_up(ptp_qoriq, rq->extts.index, false); |
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break; |
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case PTP_CLK_REQ_PPS: |
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bit = PP1EN; |
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break; |
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default: |
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return -EOPNOTSUPP; |
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} |
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spin_lock_irqsave(&ptp_qoriq->lock, flags); |
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mask = ptp_qoriq->read(®s->ctrl_regs->tmr_temask); |
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if (on) { |
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mask |= bit; |
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ptp_qoriq->write(®s->ctrl_regs->tmr_tevent, bit); |
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} else { |
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mask &= ~bit; |
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} |
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ptp_qoriq->write(®s->ctrl_regs->tmr_temask, mask); |
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spin_unlock_irqrestore(&ptp_qoriq->lock, flags); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(ptp_qoriq_enable); |
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static const struct ptp_clock_info ptp_qoriq_caps = { |
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.owner = THIS_MODULE, |
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.name = "qoriq ptp clock", |
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.max_adj = 512000, |
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.n_alarm = 0, |
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.n_ext_ts = N_EXT_TS, |
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.n_per_out = 0, |
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.n_pins = 0, |
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.pps = 1, |
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.adjfine = ptp_qoriq_adjfine, |
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.adjtime = ptp_qoriq_adjtime, |
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.gettime64 = ptp_qoriq_gettime, |
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.settime64 = ptp_qoriq_settime, |
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.enable = ptp_qoriq_enable, |
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}; |
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/** |
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* ptp_qoriq_nominal_freq - calculate nominal frequency according to |
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* reference clock frequency |
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* |
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* @clk_src: reference clock frequency |
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* |
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* The nominal frequency is the desired clock frequency. |
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* It should be less than the reference clock frequency. |
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* It should be a factor of 1000MHz. |
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* |
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* Return the nominal frequency |
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*/ |
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static u32 ptp_qoriq_nominal_freq(u32 clk_src) |
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{ |
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u32 remainder = 0; |
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clk_src /= 1000000; |
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remainder = clk_src % 100; |
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if (remainder) { |
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clk_src -= remainder; |
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clk_src += 100; |
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} |
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do { |
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clk_src -= 100; |
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} while (1000 % clk_src); |
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return clk_src * 1000000; |
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} |
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/** |
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* ptp_qoriq_auto_config - calculate a set of default configurations |
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* |
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* @ptp_qoriq: pointer to ptp_qoriq |
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* @node: pointer to device_node |
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* |
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* If below dts properties are not provided, this function will be |
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* called to calculate a set of default configurations for them. |
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* "fsl,tclk-period" |
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* "fsl,tmr-prsc" |
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* "fsl,tmr-add" |
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* "fsl,tmr-fiper1" |
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* "fsl,tmr-fiper2" |
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* "fsl,tmr-fiper3" (required only for DPAA2 and ENETC hardware) |
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* "fsl,max-adj" |
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* |
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* Return 0 if success |
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*/ |
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static int ptp_qoriq_auto_config(struct ptp_qoriq *ptp_qoriq, |
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struct device_node *node) |
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{ |
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struct clk *clk; |
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u64 freq_comp; |
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u64 max_adj; |
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u32 nominal_freq; |
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u32 remainder = 0; |
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u32 clk_src = 0; |
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ptp_qoriq->cksel = DEFAULT_CKSEL; |
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clk = of_clk_get(node, 0); |
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if (!IS_ERR(clk)) { |
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clk_src = clk_get_rate(clk); |
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clk_put(clk); |
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} |
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if (clk_src <= 100000000UL) { |
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pr_err("error reference clock value, or lower than 100MHz\n"); |
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return -EINVAL; |
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} |
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nominal_freq = ptp_qoriq_nominal_freq(clk_src); |
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if (!nominal_freq) |
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return -EINVAL; |
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ptp_qoriq->tclk_period = 1000000000UL / nominal_freq; |
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ptp_qoriq->tmr_prsc = DEFAULT_TMR_PRSC; |
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/* Calculate initial frequency compensation value for TMR_ADD register. |
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* freq_comp = ceil(2^32 / freq_ratio) |
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* freq_ratio = reference_clock_freq / nominal_freq |
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*/ |
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freq_comp = ((u64)1 << 32) * nominal_freq; |
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freq_comp = div_u64_rem(freq_comp, clk_src, &remainder); |
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if (remainder) |
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freq_comp++; |
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ptp_qoriq->tmr_add = freq_comp; |
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ptp_qoriq->tmr_fiper1 = DEFAULT_FIPER1_PERIOD - ptp_qoriq->tclk_period; |
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ptp_qoriq->tmr_fiper2 = DEFAULT_FIPER2_PERIOD - ptp_qoriq->tclk_period; |
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ptp_qoriq->tmr_fiper3 = DEFAULT_FIPER3_PERIOD - ptp_qoriq->tclk_period; |
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/* max_adj = 1000000000 * (freq_ratio - 1.0) - 1 |
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* freq_ratio = reference_clock_freq / nominal_freq |
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*/ |
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max_adj = 1000000000ULL * (clk_src - nominal_freq); |
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max_adj = div_u64(max_adj, nominal_freq) - 1; |
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ptp_qoriq->caps.max_adj = max_adj; |
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return 0; |
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} |
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int ptp_qoriq_init(struct ptp_qoriq *ptp_qoriq, void __iomem *base, |
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const struct ptp_clock_info *caps) |
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{ |
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struct device_node *node = ptp_qoriq->dev->of_node; |
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struct ptp_qoriq_registers *regs; |
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struct timespec64 now; |
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unsigned long flags; |
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u32 tmr_ctrl; |
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if (!node) |
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return -ENODEV; |
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ptp_qoriq->base = base; |
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ptp_qoriq->caps = *caps; |
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if (of_property_read_u32(node, "fsl,cksel", &ptp_qoriq->cksel)) |
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ptp_qoriq->cksel = DEFAULT_CKSEL; |
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if (of_property_read_bool(node, "fsl,extts-fifo")) |
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ptp_qoriq->extts_fifo_support = true; |
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else |
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ptp_qoriq->extts_fifo_support = false; |
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if (of_device_is_compatible(node, "fsl,dpaa2-ptp") || |
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of_device_is_compatible(node, "fsl,enetc-ptp")) |
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ptp_qoriq->fiper3_support = true; |
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if (of_property_read_u32(node, |
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"fsl,tclk-period", &ptp_qoriq->tclk_period) || |
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of_property_read_u32(node, |
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"fsl,tmr-prsc", &ptp_qoriq->tmr_prsc) || |
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of_property_read_u32(node, |
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"fsl,tmr-add", &ptp_qoriq->tmr_add) || |
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of_property_read_u32(node, |
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"fsl,tmr-fiper1", &ptp_qoriq->tmr_fiper1) || |
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of_property_read_u32(node, |
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"fsl,tmr-fiper2", &ptp_qoriq->tmr_fiper2) || |
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of_property_read_u32(node, |
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"fsl,max-adj", &ptp_qoriq->caps.max_adj) || |
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(ptp_qoriq->fiper3_support && |
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of_property_read_u32(node, "fsl,tmr-fiper3", |
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&ptp_qoriq->tmr_fiper3))) { |
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pr_warn("device tree node missing required elements, try automatic configuration\n"); |
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if (ptp_qoriq_auto_config(ptp_qoriq, node)) |
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return -ENODEV; |
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} |
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if (of_property_read_bool(node, "little-endian")) { |
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ptp_qoriq->read = qoriq_read_le; |
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ptp_qoriq->write = qoriq_write_le; |
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} else { |
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ptp_qoriq->read = qoriq_read_be; |
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ptp_qoriq->write = qoriq_write_be; |
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} |
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/* The eTSEC uses differnt memory map with DPAA/ENETC */ |
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if (of_device_is_compatible(node, "fsl,etsec-ptp")) { |
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ptp_qoriq->regs.ctrl_regs = base + ETSEC_CTRL_REGS_OFFSET; |
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ptp_qoriq->regs.alarm_regs = base + ETSEC_ALARM_REGS_OFFSET; |
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ptp_qoriq->regs.fiper_regs = base + ETSEC_FIPER_REGS_OFFSET; |
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ptp_qoriq->regs.etts_regs = base + ETSEC_ETTS_REGS_OFFSET; |
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} else { |
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ptp_qoriq->regs.ctrl_regs = base + CTRL_REGS_OFFSET; |
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ptp_qoriq->regs.alarm_regs = base + ALARM_REGS_OFFSET; |
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ptp_qoriq->regs.fiper_regs = base + FIPER_REGS_OFFSET; |
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ptp_qoriq->regs.etts_regs = base + ETTS_REGS_OFFSET; |
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} |
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spin_lock_init(&ptp_qoriq->lock); |
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ktime_get_real_ts64(&now); |
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ptp_qoriq_settime(&ptp_qoriq->caps, &now); |
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tmr_ctrl = |
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(ptp_qoriq->tclk_period & TCLK_PERIOD_MASK) << TCLK_PERIOD_SHIFT | |
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(ptp_qoriq->cksel & CKSEL_MASK) << CKSEL_SHIFT; |
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spin_lock_irqsave(&ptp_qoriq->lock, flags); |
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regs = &ptp_qoriq->regs; |
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ptp_qoriq->write(®s->ctrl_regs->tmr_ctrl, tmr_ctrl); |
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ptp_qoriq->write(®s->ctrl_regs->tmr_add, ptp_qoriq->tmr_add); |
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ptp_qoriq->write(®s->ctrl_regs->tmr_prsc, ptp_qoriq->tmr_prsc); |
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ptp_qoriq->write(®s->fiper_regs->tmr_fiper1, ptp_qoriq->tmr_fiper1); |
|
ptp_qoriq->write(®s->fiper_regs->tmr_fiper2, ptp_qoriq->tmr_fiper2); |
|
|
|
if (ptp_qoriq->fiper3_support) |
|
ptp_qoriq->write(®s->fiper_regs->tmr_fiper3, |
|
ptp_qoriq->tmr_fiper3); |
|
|
|
set_alarm(ptp_qoriq); |
|
ptp_qoriq->write(®s->ctrl_regs->tmr_ctrl, |
|
tmr_ctrl|FIPERST|RTPE|TE|FRD); |
|
|
|
spin_unlock_irqrestore(&ptp_qoriq->lock, flags); |
|
|
|
ptp_qoriq->clock = ptp_clock_register(&ptp_qoriq->caps, ptp_qoriq->dev); |
|
if (IS_ERR(ptp_qoriq->clock)) |
|
return PTR_ERR(ptp_qoriq->clock); |
|
|
|
ptp_qoriq->phc_index = ptp_clock_index(ptp_qoriq->clock); |
|
ptp_qoriq_create_debugfs(ptp_qoriq); |
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(ptp_qoriq_init); |
|
|
|
void ptp_qoriq_free(struct ptp_qoriq *ptp_qoriq) |
|
{ |
|
struct ptp_qoriq_registers *regs = &ptp_qoriq->regs; |
|
|
|
ptp_qoriq->write(®s->ctrl_regs->tmr_temask, 0); |
|
ptp_qoriq->write(®s->ctrl_regs->tmr_ctrl, 0); |
|
|
|
ptp_qoriq_remove_debugfs(ptp_qoriq); |
|
ptp_clock_unregister(ptp_qoriq->clock); |
|
iounmap(ptp_qoriq->base); |
|
free_irq(ptp_qoriq->irq, ptp_qoriq); |
|
} |
|
EXPORT_SYMBOL_GPL(ptp_qoriq_free); |
|
|
|
static int ptp_qoriq_probe(struct platform_device *dev) |
|
{ |
|
struct ptp_qoriq *ptp_qoriq; |
|
int err = -ENOMEM; |
|
void __iomem *base; |
|
|
|
ptp_qoriq = kzalloc(sizeof(*ptp_qoriq), GFP_KERNEL); |
|
if (!ptp_qoriq) |
|
goto no_memory; |
|
|
|
ptp_qoriq->dev = &dev->dev; |
|
|
|
err = -ENODEV; |
|
|
|
ptp_qoriq->irq = platform_get_irq(dev, 0); |
|
if (ptp_qoriq->irq < 0) { |
|
pr_err("irq not in device tree\n"); |
|
goto no_node; |
|
} |
|
if (request_irq(ptp_qoriq->irq, ptp_qoriq_isr, IRQF_SHARED, |
|
DRIVER, ptp_qoriq)) { |
|
pr_err("request_irq failed\n"); |
|
goto no_node; |
|
} |
|
|
|
ptp_qoriq->rsrc = platform_get_resource(dev, IORESOURCE_MEM, 0); |
|
if (!ptp_qoriq->rsrc) { |
|
pr_err("no resource\n"); |
|
goto no_resource; |
|
} |
|
if (request_resource(&iomem_resource, ptp_qoriq->rsrc)) { |
|
pr_err("resource busy\n"); |
|
goto no_resource; |
|
} |
|
|
|
base = ioremap(ptp_qoriq->rsrc->start, |
|
resource_size(ptp_qoriq->rsrc)); |
|
if (!base) { |
|
pr_err("ioremap ptp registers failed\n"); |
|
goto no_ioremap; |
|
} |
|
|
|
err = ptp_qoriq_init(ptp_qoriq, base, &ptp_qoriq_caps); |
|
if (err) |
|
goto no_clock; |
|
|
|
platform_set_drvdata(dev, ptp_qoriq); |
|
return 0; |
|
|
|
no_clock: |
|
iounmap(ptp_qoriq->base); |
|
no_ioremap: |
|
release_resource(ptp_qoriq->rsrc); |
|
no_resource: |
|
free_irq(ptp_qoriq->irq, ptp_qoriq); |
|
no_node: |
|
kfree(ptp_qoriq); |
|
no_memory: |
|
return err; |
|
} |
|
|
|
static int ptp_qoriq_remove(struct platform_device *dev) |
|
{ |
|
struct ptp_qoriq *ptp_qoriq = platform_get_drvdata(dev); |
|
|
|
ptp_qoriq_free(ptp_qoriq); |
|
release_resource(ptp_qoriq->rsrc); |
|
kfree(ptp_qoriq); |
|
return 0; |
|
} |
|
|
|
static const struct of_device_id match_table[] = { |
|
{ .compatible = "fsl,etsec-ptp" }, |
|
{ .compatible = "fsl,fman-ptp-timer" }, |
|
{}, |
|
}; |
|
MODULE_DEVICE_TABLE(of, match_table); |
|
|
|
static struct platform_driver ptp_qoriq_driver = { |
|
.driver = { |
|
.name = "ptp_qoriq", |
|
.of_match_table = match_table, |
|
}, |
|
.probe = ptp_qoriq_probe, |
|
.remove = ptp_qoriq_remove, |
|
}; |
|
|
|
module_platform_driver(ptp_qoriq_driver); |
|
|
|
MODULE_AUTHOR("Richard Cochran <[email protected]>"); |
|
MODULE_DESCRIPTION("PTP clock for Freescale QorIQ 1588 timer"); |
|
MODULE_LICENSE("GPL");
|
|
|