v4.19.13 snapshot.
diff --git a/drivers/ptp/ptp_qoriq.c b/drivers/ptp/ptp_qoriq.c
new file mode 100644
index 0000000..fdd49c2
--- /dev/null
+++ b/drivers/ptp/ptp_qoriq.c
@@ -0,0 +1,589 @@
+/*
+ * PTP 1588 clock for Freescale QorIQ 1588 timer
+ *
+ * Copyright (C) 2010 OMICRON electronics GmbH
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/device.h>
+#include <linux/hrtimer.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/timex.h>
+#include <linux/slab.h>
+#include <linux/clk.h>
+
+#include <linux/fsl/ptp_qoriq.h>
+
+/*
+ * Register access functions
+ */
+
+/* Caller must hold qoriq_ptp->lock. */
+static u64 tmr_cnt_read(struct qoriq_ptp *qoriq_ptp)
+{
+ struct qoriq_ptp_registers *regs = &qoriq_ptp->regs;
+ u64 ns;
+ u32 lo, hi;
+
+ lo = qoriq_read(®s->ctrl_regs->tmr_cnt_l);
+ hi = qoriq_read(®s->ctrl_regs->tmr_cnt_h);
+ ns = ((u64) hi) << 32;
+ ns |= lo;
+ return ns;
+}
+
+/* Caller must hold qoriq_ptp->lock. */
+static void tmr_cnt_write(struct qoriq_ptp *qoriq_ptp, u64 ns)
+{
+ struct qoriq_ptp_registers *regs = &qoriq_ptp->regs;
+ u32 hi = ns >> 32;
+ u32 lo = ns & 0xffffffff;
+
+ qoriq_write(®s->ctrl_regs->tmr_cnt_l, lo);
+ qoriq_write(®s->ctrl_regs->tmr_cnt_h, hi);
+}
+
+/* Caller must hold qoriq_ptp->lock. */
+static void set_alarm(struct qoriq_ptp *qoriq_ptp)
+{
+ struct qoriq_ptp_registers *regs = &qoriq_ptp->regs;
+ u64 ns;
+ u32 lo, hi;
+
+ ns = tmr_cnt_read(qoriq_ptp) + 1500000000ULL;
+ ns = div_u64(ns, 1000000000UL) * 1000000000ULL;
+ ns -= qoriq_ptp->tclk_period;
+ hi = ns >> 32;
+ lo = ns & 0xffffffff;
+ qoriq_write(®s->alarm_regs->tmr_alarm1_l, lo);
+ qoriq_write(®s->alarm_regs->tmr_alarm1_h, hi);
+}
+
+/* Caller must hold qoriq_ptp->lock. */
+static void set_fipers(struct qoriq_ptp *qoriq_ptp)
+{
+ struct qoriq_ptp_registers *regs = &qoriq_ptp->regs;
+
+ set_alarm(qoriq_ptp);
+ qoriq_write(®s->fiper_regs->tmr_fiper1, qoriq_ptp->tmr_fiper1);
+ qoriq_write(®s->fiper_regs->tmr_fiper2, qoriq_ptp->tmr_fiper2);
+}
+
+/*
+ * Interrupt service routine
+ */
+
+static irqreturn_t isr(int irq, void *priv)
+{
+ struct qoriq_ptp *qoriq_ptp = priv;
+ struct qoriq_ptp_registers *regs = &qoriq_ptp->regs;
+ struct ptp_clock_event event;
+ u64 ns;
+ u32 ack = 0, lo, hi, mask, val;
+
+ val = qoriq_read(®s->ctrl_regs->tmr_tevent);
+
+ if (val & ETS1) {
+ ack |= ETS1;
+ hi = qoriq_read(®s->etts_regs->tmr_etts1_h);
+ lo = qoriq_read(®s->etts_regs->tmr_etts1_l);
+ event.type = PTP_CLOCK_EXTTS;
+ event.index = 0;
+ event.timestamp = ((u64) hi) << 32;
+ event.timestamp |= lo;
+ ptp_clock_event(qoriq_ptp->clock, &event);
+ }
+
+ if (val & ETS2) {
+ ack |= ETS2;
+ hi = qoriq_read(®s->etts_regs->tmr_etts2_h);
+ lo = qoriq_read(®s->etts_regs->tmr_etts2_l);
+ event.type = PTP_CLOCK_EXTTS;
+ event.index = 1;
+ event.timestamp = ((u64) hi) << 32;
+ event.timestamp |= lo;
+ ptp_clock_event(qoriq_ptp->clock, &event);
+ }
+
+ if (val & ALM2) {
+ ack |= ALM2;
+ if (qoriq_ptp->alarm_value) {
+ event.type = PTP_CLOCK_ALARM;
+ event.index = 0;
+ event.timestamp = qoriq_ptp->alarm_value;
+ ptp_clock_event(qoriq_ptp->clock, &event);
+ }
+ if (qoriq_ptp->alarm_interval) {
+ ns = qoriq_ptp->alarm_value + qoriq_ptp->alarm_interval;
+ hi = ns >> 32;
+ lo = ns & 0xffffffff;
+ spin_lock(&qoriq_ptp->lock);
+ qoriq_write(®s->alarm_regs->tmr_alarm2_l, lo);
+ qoriq_write(®s->alarm_regs->tmr_alarm2_h, hi);
+ spin_unlock(&qoriq_ptp->lock);
+ qoriq_ptp->alarm_value = ns;
+ } else {
+ qoriq_write(®s->ctrl_regs->tmr_tevent, ALM2);
+ spin_lock(&qoriq_ptp->lock);
+ mask = qoriq_read(®s->ctrl_regs->tmr_temask);
+ mask &= ~ALM2EN;
+ qoriq_write(®s->ctrl_regs->tmr_temask, mask);
+ spin_unlock(&qoriq_ptp->lock);
+ qoriq_ptp->alarm_value = 0;
+ qoriq_ptp->alarm_interval = 0;
+ }
+ }
+
+ if (val & PP1) {
+ ack |= PP1;
+ event.type = PTP_CLOCK_PPS;
+ ptp_clock_event(qoriq_ptp->clock, &event);
+ }
+
+ if (ack) {
+ qoriq_write(®s->ctrl_regs->tmr_tevent, ack);
+ return IRQ_HANDLED;
+ } else
+ return IRQ_NONE;
+}
+
+/*
+ * PTP clock operations
+ */
+
+static int ptp_qoriq_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
+{
+ u64 adj, diff;
+ u32 tmr_add;
+ int neg_adj = 0;
+ struct qoriq_ptp *qoriq_ptp = container_of(ptp, struct qoriq_ptp, caps);
+ struct qoriq_ptp_registers *regs = &qoriq_ptp->regs;
+
+ if (scaled_ppm < 0) {
+ neg_adj = 1;
+ scaled_ppm = -scaled_ppm;
+ }
+ tmr_add = qoriq_ptp->tmr_add;
+ adj = tmr_add;
+
+ /* calculate diff as adj*(scaled_ppm/65536)/1000000
+ * and round() to the nearest integer
+ */
+ adj *= scaled_ppm;
+ diff = div_u64(adj, 8000000);
+ diff = (diff >> 13) + ((diff >> 12) & 1);
+
+ tmr_add = neg_adj ? tmr_add - diff : tmr_add + diff;
+
+ qoriq_write(®s->ctrl_regs->tmr_add, tmr_add);
+
+ return 0;
+}
+
+static int ptp_qoriq_adjtime(struct ptp_clock_info *ptp, s64 delta)
+{
+ s64 now;
+ unsigned long flags;
+ struct qoriq_ptp *qoriq_ptp = container_of(ptp, struct qoriq_ptp, caps);
+
+ spin_lock_irqsave(&qoriq_ptp->lock, flags);
+
+ now = tmr_cnt_read(qoriq_ptp);
+ now += delta;
+ tmr_cnt_write(qoriq_ptp, now);
+ set_fipers(qoriq_ptp);
+
+ spin_unlock_irqrestore(&qoriq_ptp->lock, flags);
+
+ return 0;
+}
+
+static int ptp_qoriq_gettime(struct ptp_clock_info *ptp,
+ struct timespec64 *ts)
+{
+ u64 ns;
+ unsigned long flags;
+ struct qoriq_ptp *qoriq_ptp = container_of(ptp, struct qoriq_ptp, caps);
+
+ spin_lock_irqsave(&qoriq_ptp->lock, flags);
+
+ ns = tmr_cnt_read(qoriq_ptp);
+
+ spin_unlock_irqrestore(&qoriq_ptp->lock, flags);
+
+ *ts = ns_to_timespec64(ns);
+
+ return 0;
+}
+
+static int ptp_qoriq_settime(struct ptp_clock_info *ptp,
+ const struct timespec64 *ts)
+{
+ u64 ns;
+ unsigned long flags;
+ struct qoriq_ptp *qoriq_ptp = container_of(ptp, struct qoriq_ptp, caps);
+
+ ns = timespec64_to_ns(ts);
+
+ spin_lock_irqsave(&qoriq_ptp->lock, flags);
+
+ tmr_cnt_write(qoriq_ptp, ns);
+ set_fipers(qoriq_ptp);
+
+ spin_unlock_irqrestore(&qoriq_ptp->lock, flags);
+
+ return 0;
+}
+
+static int ptp_qoriq_enable(struct ptp_clock_info *ptp,
+ struct ptp_clock_request *rq, int on)
+{
+ struct qoriq_ptp *qoriq_ptp = container_of(ptp, struct qoriq_ptp, caps);
+ struct qoriq_ptp_registers *regs = &qoriq_ptp->regs;
+ unsigned long flags;
+ u32 bit, mask;
+
+ switch (rq->type) {
+ case PTP_CLK_REQ_EXTTS:
+ switch (rq->extts.index) {
+ case 0:
+ bit = ETS1EN;
+ break;
+ case 1:
+ bit = ETS2EN;
+ break;
+ default:
+ return -EINVAL;
+ }
+ spin_lock_irqsave(&qoriq_ptp->lock, flags);
+ mask = qoriq_read(®s->ctrl_regs->tmr_temask);
+ if (on)
+ mask |= bit;
+ else
+ mask &= ~bit;
+ qoriq_write(®s->ctrl_regs->tmr_temask, mask);
+ spin_unlock_irqrestore(&qoriq_ptp->lock, flags);
+ return 0;
+
+ case PTP_CLK_REQ_PPS:
+ spin_lock_irqsave(&qoriq_ptp->lock, flags);
+ mask = qoriq_read(®s->ctrl_regs->tmr_temask);
+ if (on)
+ mask |= PP1EN;
+ else
+ mask &= ~PP1EN;
+ qoriq_write(®s->ctrl_regs->tmr_temask, mask);
+ spin_unlock_irqrestore(&qoriq_ptp->lock, flags);
+ return 0;
+
+ default:
+ break;
+ }
+
+ return -EOPNOTSUPP;
+}
+
+static const struct ptp_clock_info ptp_qoriq_caps = {
+ .owner = THIS_MODULE,
+ .name = "qoriq ptp clock",
+ .max_adj = 512000,
+ .n_alarm = 0,
+ .n_ext_ts = N_EXT_TS,
+ .n_per_out = 0,
+ .n_pins = 0,
+ .pps = 1,
+ .adjfine = ptp_qoriq_adjfine,
+ .adjtime = ptp_qoriq_adjtime,
+ .gettime64 = ptp_qoriq_gettime,
+ .settime64 = ptp_qoriq_settime,
+ .enable = ptp_qoriq_enable,
+};
+
+/**
+ * qoriq_ptp_nominal_freq - calculate nominal frequency according to
+ * reference clock frequency
+ *
+ * @clk_src: reference clock frequency
+ *
+ * The nominal frequency is the desired clock frequency.
+ * It should be less than the reference clock frequency.
+ * It should be a factor of 1000MHz.
+ *
+ * Return the nominal frequency
+ */
+static u32 qoriq_ptp_nominal_freq(u32 clk_src)
+{
+ u32 remainder = 0;
+
+ clk_src /= 1000000;
+ remainder = clk_src % 100;
+ if (remainder) {
+ clk_src -= remainder;
+ clk_src += 100;
+ }
+
+ do {
+ clk_src -= 100;
+
+ } while (1000 % clk_src);
+
+ return clk_src * 1000000;
+}
+
+/**
+ * qoriq_ptp_auto_config - calculate a set of default configurations
+ *
+ * @qoriq_ptp: pointer to qoriq_ptp
+ * @node: pointer to device_node
+ *
+ * If below dts properties are not provided, this function will be
+ * called to calculate a set of default configurations for them.
+ * "fsl,tclk-period"
+ * "fsl,tmr-prsc"
+ * "fsl,tmr-add"
+ * "fsl,tmr-fiper1"
+ * "fsl,tmr-fiper2"
+ * "fsl,max-adj"
+ *
+ * Return 0 if success
+ */
+static int qoriq_ptp_auto_config(struct qoriq_ptp *qoriq_ptp,
+ struct device_node *node)
+{
+ struct clk *clk;
+ u64 freq_comp;
+ u64 max_adj;
+ u32 nominal_freq;
+ u32 remainder = 0;
+ u32 clk_src = 0;
+
+ qoriq_ptp->cksel = DEFAULT_CKSEL;
+
+ clk = of_clk_get(node, 0);
+ if (!IS_ERR(clk)) {
+ clk_src = clk_get_rate(clk);
+ clk_put(clk);
+ }
+
+ if (clk_src <= 100000000UL) {
+ pr_err("error reference clock value, or lower than 100MHz\n");
+ return -EINVAL;
+ }
+
+ nominal_freq = qoriq_ptp_nominal_freq(clk_src);
+ if (!nominal_freq)
+ return -EINVAL;
+
+ qoriq_ptp->tclk_period = 1000000000UL / nominal_freq;
+ qoriq_ptp->tmr_prsc = DEFAULT_TMR_PRSC;
+
+ /* Calculate initial frequency compensation value for TMR_ADD register.
+ * freq_comp = ceil(2^32 / freq_ratio)
+ * freq_ratio = reference_clock_freq / nominal_freq
+ */
+ freq_comp = ((u64)1 << 32) * nominal_freq;
+ freq_comp = div_u64_rem(freq_comp, clk_src, &remainder);
+ if (remainder)
+ freq_comp++;
+
+ qoriq_ptp->tmr_add = freq_comp;
+ qoriq_ptp->tmr_fiper1 = DEFAULT_FIPER1_PERIOD - qoriq_ptp->tclk_period;
+ qoriq_ptp->tmr_fiper2 = DEFAULT_FIPER2_PERIOD - qoriq_ptp->tclk_period;
+
+ /* max_adj = 1000000000 * (freq_ratio - 1.0) - 1
+ * freq_ratio = reference_clock_freq / nominal_freq
+ */
+ max_adj = 1000000000ULL * (clk_src - nominal_freq);
+ max_adj = div_u64(max_adj, nominal_freq) - 1;
+ qoriq_ptp->caps.max_adj = max_adj;
+
+ return 0;
+}
+
+static int qoriq_ptp_probe(struct platform_device *dev)
+{
+ struct device_node *node = dev->dev.of_node;
+ struct qoriq_ptp *qoriq_ptp;
+ struct qoriq_ptp_registers *regs;
+ struct timespec64 now;
+ int err = -ENOMEM;
+ u32 tmr_ctrl;
+ unsigned long flags;
+ void __iomem *base;
+
+ qoriq_ptp = kzalloc(sizeof(*qoriq_ptp), GFP_KERNEL);
+ if (!qoriq_ptp)
+ goto no_memory;
+
+ err = -EINVAL;
+
+ qoriq_ptp->caps = ptp_qoriq_caps;
+
+ if (of_property_read_u32(node, "fsl,cksel", &qoriq_ptp->cksel))
+ qoriq_ptp->cksel = DEFAULT_CKSEL;
+
+ if (of_property_read_u32(node,
+ "fsl,tclk-period", &qoriq_ptp->tclk_period) ||
+ of_property_read_u32(node,
+ "fsl,tmr-prsc", &qoriq_ptp->tmr_prsc) ||
+ of_property_read_u32(node,
+ "fsl,tmr-add", &qoriq_ptp->tmr_add) ||
+ of_property_read_u32(node,
+ "fsl,tmr-fiper1", &qoriq_ptp->tmr_fiper1) ||
+ of_property_read_u32(node,
+ "fsl,tmr-fiper2", &qoriq_ptp->tmr_fiper2) ||
+ of_property_read_u32(node,
+ "fsl,max-adj", &qoriq_ptp->caps.max_adj)) {
+ pr_warn("device tree node missing required elements, try automatic configuration\n");
+
+ if (qoriq_ptp_auto_config(qoriq_ptp, node))
+ goto no_config;
+ }
+
+ err = -ENODEV;
+
+ qoriq_ptp->irq = platform_get_irq(dev, 0);
+
+ if (qoriq_ptp->irq < 0) {
+ pr_err("irq not in device tree\n");
+ goto no_node;
+ }
+ if (request_irq(qoriq_ptp->irq, isr, IRQF_SHARED, DRIVER, qoriq_ptp)) {
+ pr_err("request_irq failed\n");
+ goto no_node;
+ }
+
+ qoriq_ptp->rsrc = platform_get_resource(dev, IORESOURCE_MEM, 0);
+ if (!qoriq_ptp->rsrc) {
+ pr_err("no resource\n");
+ goto no_resource;
+ }
+ if (request_resource(&iomem_resource, qoriq_ptp->rsrc)) {
+ pr_err("resource busy\n");
+ goto no_resource;
+ }
+
+ spin_lock_init(&qoriq_ptp->lock);
+
+ base = ioremap(qoriq_ptp->rsrc->start,
+ resource_size(qoriq_ptp->rsrc));
+ if (!base) {
+ pr_err("ioremap ptp registers failed\n");
+ goto no_ioremap;
+ }
+
+ qoriq_ptp->base = base;
+
+ if (of_device_is_compatible(node, "fsl,fman-ptp-timer")) {
+ qoriq_ptp->regs.ctrl_regs = base + FMAN_CTRL_REGS_OFFSET;
+ qoriq_ptp->regs.alarm_regs = base + FMAN_ALARM_REGS_OFFSET;
+ qoriq_ptp->regs.fiper_regs = base + FMAN_FIPER_REGS_OFFSET;
+ qoriq_ptp->regs.etts_regs = base + FMAN_ETTS_REGS_OFFSET;
+ } else {
+ qoriq_ptp->regs.ctrl_regs = base + CTRL_REGS_OFFSET;
+ qoriq_ptp->regs.alarm_regs = base + ALARM_REGS_OFFSET;
+ qoriq_ptp->regs.fiper_regs = base + FIPER_REGS_OFFSET;
+ qoriq_ptp->regs.etts_regs = base + ETTS_REGS_OFFSET;
+ }
+
+ ktime_get_real_ts64(&now);
+ ptp_qoriq_settime(&qoriq_ptp->caps, &now);
+
+ tmr_ctrl =
+ (qoriq_ptp->tclk_period & TCLK_PERIOD_MASK) << TCLK_PERIOD_SHIFT |
+ (qoriq_ptp->cksel & CKSEL_MASK) << CKSEL_SHIFT;
+
+ spin_lock_irqsave(&qoriq_ptp->lock, flags);
+
+ regs = &qoriq_ptp->regs;
+ qoriq_write(®s->ctrl_regs->tmr_ctrl, tmr_ctrl);
+ qoriq_write(®s->ctrl_regs->tmr_add, qoriq_ptp->tmr_add);
+ qoriq_write(®s->ctrl_regs->tmr_prsc, qoriq_ptp->tmr_prsc);
+ qoriq_write(®s->fiper_regs->tmr_fiper1, qoriq_ptp->tmr_fiper1);
+ qoriq_write(®s->fiper_regs->tmr_fiper2, qoriq_ptp->tmr_fiper2);
+ set_alarm(qoriq_ptp);
+ qoriq_write(®s->ctrl_regs->tmr_ctrl, tmr_ctrl|FIPERST|RTPE|TE|FRD);
+
+ spin_unlock_irqrestore(&qoriq_ptp->lock, flags);
+
+ qoriq_ptp->clock = ptp_clock_register(&qoriq_ptp->caps, &dev->dev);
+ if (IS_ERR(qoriq_ptp->clock)) {
+ err = PTR_ERR(qoriq_ptp->clock);
+ goto no_clock;
+ }
+ qoriq_ptp->phc_index = ptp_clock_index(qoriq_ptp->clock);
+
+ platform_set_drvdata(dev, qoriq_ptp);
+
+ return 0;
+
+no_clock:
+ iounmap(qoriq_ptp->base);
+no_ioremap:
+ release_resource(qoriq_ptp->rsrc);
+no_resource:
+ free_irq(qoriq_ptp->irq, qoriq_ptp);
+no_config:
+no_node:
+ kfree(qoriq_ptp);
+no_memory:
+ return err;
+}
+
+static int qoriq_ptp_remove(struct platform_device *dev)
+{
+ struct qoriq_ptp *qoriq_ptp = platform_get_drvdata(dev);
+ struct qoriq_ptp_registers *regs = &qoriq_ptp->regs;
+
+ qoriq_write(®s->ctrl_regs->tmr_temask, 0);
+ qoriq_write(®s->ctrl_regs->tmr_ctrl, 0);
+
+ ptp_clock_unregister(qoriq_ptp->clock);
+ iounmap(qoriq_ptp->base);
+ release_resource(qoriq_ptp->rsrc);
+ free_irq(qoriq_ptp->irq, qoriq_ptp);
+ kfree(qoriq_ptp);
+
+ 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 qoriq_ptp_driver = {
+ .driver = {
+ .name = "ptp_qoriq",
+ .of_match_table = match_table,
+ },
+ .probe = qoriq_ptp_probe,
+ .remove = qoriq_ptp_remove,
+};
+
+module_platform_driver(qoriq_ptp_driver);
+
+MODULE_AUTHOR("Richard Cochran <richardcochran@gmail.com>");
+MODULE_DESCRIPTION("PTP clock for Freescale QorIQ 1588 timer");
+MODULE_LICENSE("GPL");