linux/drivers/ptp/ptp_qoriq.c

627 lines
15 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* PTP 1588 clock for Freescale QorIQ 1588 timer
*
* Copyright (C) 2010 OMICRON electronics GmbH
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/device.h>
#include <linux/hrtimer.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 ptp_qoriq->lock. */
static u64 tmr_cnt_read(struct ptp_qoriq *ptp_qoriq)
{
struct ptp_qoriq_registers *regs = &ptp_qoriq->regs;
u64 ns;
u32 lo, hi;
lo = ptp_qoriq->read(&regs->ctrl_regs->tmr_cnt_l);
hi = ptp_qoriq->read(&regs->ctrl_regs->tmr_cnt_h);
ns = ((u64) hi) << 32;
ns |= lo;
return ns;
}
/* Caller must hold ptp_qoriq->lock. */
static void tmr_cnt_write(struct ptp_qoriq *ptp_qoriq, u64 ns)
{
struct ptp_qoriq_registers *regs = &ptp_qoriq->regs;
u32 hi = ns >> 32;
u32 lo = ns & 0xffffffff;
ptp_qoriq->write(&regs->ctrl_regs->tmr_cnt_l, lo);
ptp_qoriq->write(&regs->ctrl_regs->tmr_cnt_h, hi);
}
/* Caller must hold ptp_qoriq->lock. */
static void set_alarm(struct ptp_qoriq *ptp_qoriq)
{
struct ptp_qoriq_registers *regs = &ptp_qoriq->regs;
u64 ns;
u32 lo, hi;
ns = tmr_cnt_read(ptp_qoriq) + 1500000000ULL;
ns = div_u64(ns, 1000000000UL) * 1000000000ULL;
ns -= ptp_qoriq->tclk_period;
hi = ns >> 32;
lo = ns & 0xffffffff;
ptp_qoriq->write(&regs->alarm_regs->tmr_alarm1_l, lo);
ptp_qoriq->write(&regs->alarm_regs->tmr_alarm1_h, hi);
}
/* Caller must hold ptp_qoriq->lock. */
static void set_fipers(struct ptp_qoriq *ptp_qoriq)
{
struct ptp_qoriq_registers *regs = &ptp_qoriq->regs;
set_alarm(ptp_qoriq);
ptp_qoriq->write(&regs->fiper_regs->tmr_fiper1, ptp_qoriq->tmr_fiper1);
ptp_qoriq->write(&regs->fiper_regs->tmr_fiper2, ptp_qoriq->tmr_fiper2);
}
int extts_clean_up(struct ptp_qoriq *ptp_qoriq, int index, bool update_event)
{
struct ptp_qoriq_registers *regs = &ptp_qoriq->regs;
struct ptp_clock_event event;
void __iomem *reg_etts_l;
void __iomem *reg_etts_h;
u32 valid, lo, hi;
switch (index) {
case 0:
valid = ETS1_VLD;
reg_etts_l = &regs->etts_regs->tmr_etts1_l;
reg_etts_h = &regs->etts_regs->tmr_etts1_h;
break;
case 1:
valid = ETS2_VLD;
reg_etts_l = &regs->etts_regs->tmr_etts2_l;
reg_etts_h = &regs->etts_regs->tmr_etts2_h;
break;
default:
return -EINVAL;
}
event.type = PTP_CLOCK_EXTTS;
event.index = index;
if (ptp_qoriq->extts_fifo_support)
if (!(ptp_qoriq->read(&regs->ctrl_regs->tmr_stat) & valid))
return 0;
do {
lo = ptp_qoriq->read(reg_etts_l);
hi = ptp_qoriq->read(reg_etts_h);
if (update_event) {
event.timestamp = ((u64) hi) << 32;
event.timestamp |= lo;
ptp_clock_event(ptp_qoriq->clock, &event);
}
if (!ptp_qoriq->extts_fifo_support)
break;
} while (ptp_qoriq->read(&regs->ctrl_regs->tmr_stat) & valid);
return 0;
}
EXPORT_SYMBOL_GPL(extts_clean_up);
/*
* Interrupt service routine
*/
irqreturn_t ptp_qoriq_isr(int irq, void *priv)
{
struct ptp_qoriq *ptp_qoriq = priv;
struct ptp_qoriq_registers *regs = &ptp_qoriq->regs;
struct ptp_clock_event event;
u32 ack = 0, mask, val, irqs;
spin_lock(&ptp_qoriq->lock);
val = ptp_qoriq->read(&regs->ctrl_regs->tmr_tevent);
mask = ptp_qoriq->read(&regs->ctrl_regs->tmr_temask);
spin_unlock(&ptp_qoriq->lock);
irqs = val & mask;
if (irqs & ETS1) {
ack |= ETS1;
extts_clean_up(ptp_qoriq, 0, true);
}
if (irqs & ETS2) {
ack |= ETS2;
extts_clean_up(ptp_qoriq, 1, true);
}
if (irqs & PP1) {
ack |= PP1;
event.type = PTP_CLOCK_PPS;
ptp_clock_event(ptp_qoriq->clock, &event);
}
if (ack) {
ptp_qoriq->write(&regs->ctrl_regs->tmr_tevent, ack);
return IRQ_HANDLED;
} else
return IRQ_NONE;
}
EXPORT_SYMBOL_GPL(ptp_qoriq_isr);
/*
* PTP clock operations
*/
int ptp_qoriq_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
{
u64 adj, diff;
u32 tmr_add;
int neg_adj = 0;
struct ptp_qoriq *ptp_qoriq = container_of(ptp, struct ptp_qoriq, caps);
struct ptp_qoriq_registers *regs = &ptp_qoriq->regs;
if (scaled_ppm < 0) {
neg_adj = 1;
scaled_ppm = -scaled_ppm;
}
tmr_add = ptp_qoriq->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;
ptp_qoriq->write(&regs->ctrl_regs->tmr_add, tmr_add);
return 0;
}
EXPORT_SYMBOL_GPL(ptp_qoriq_adjfine);
int ptp_qoriq_adjtime(struct ptp_clock_info *ptp, s64 delta)
{
s64 now;
unsigned long flags;
struct ptp_qoriq *ptp_qoriq = container_of(ptp, struct ptp_qoriq, caps);
spin_lock_irqsave(&ptp_qoriq->lock, flags);
now = tmr_cnt_read(ptp_qoriq);
now += delta;
tmr_cnt_write(ptp_qoriq, now);
set_fipers(ptp_qoriq);
spin_unlock_irqrestore(&ptp_qoriq->lock, flags);
return 0;
}
EXPORT_SYMBOL_GPL(ptp_qoriq_adjtime);
int ptp_qoriq_gettime(struct ptp_clock_info *ptp, struct timespec64 *ts)
{
u64 ns;
unsigned long flags;
struct ptp_qoriq *ptp_qoriq = container_of(ptp, struct ptp_qoriq, caps);
spin_lock_irqsave(&ptp_qoriq->lock, flags);
ns = tmr_cnt_read(ptp_qoriq);
spin_unlock_irqrestore(&ptp_qoriq->lock, flags);
*ts = ns_to_timespec64(ns);
return 0;
}
EXPORT_SYMBOL_GPL(ptp_qoriq_gettime);
int ptp_qoriq_settime(struct ptp_clock_info *ptp,
const struct timespec64 *ts)
{
u64 ns;
unsigned long flags;
struct ptp_qoriq *ptp_qoriq = container_of(ptp, struct ptp_qoriq, caps);
ns = timespec64_to_ns(ts);
spin_lock_irqsave(&ptp_qoriq->lock, flags);
tmr_cnt_write(ptp_qoriq, ns);
set_fipers(ptp_qoriq);
spin_unlock_irqrestore(&ptp_qoriq->lock, flags);
return 0;
}
EXPORT_SYMBOL_GPL(ptp_qoriq_settime);
int ptp_qoriq_enable(struct ptp_clock_info *ptp,
struct ptp_clock_request *rq, int on)
{
struct ptp_qoriq *ptp_qoriq = container_of(ptp, struct ptp_qoriq, caps);
struct ptp_qoriq_registers *regs = &ptp_qoriq->regs;
unsigned long flags;
u32 bit, mask = 0;
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;
}
if (on)
extts_clean_up(ptp_qoriq, rq->extts.index, false);
break;
case PTP_CLK_REQ_PPS:
bit = PP1EN;
break;
default:
return -EOPNOTSUPP;
}
spin_lock_irqsave(&ptp_qoriq->lock, flags);
mask = ptp_qoriq->read(&regs->ctrl_regs->tmr_temask);
if (on) {
mask |= bit;
ptp_qoriq->write(&regs->ctrl_regs->tmr_tevent, bit);
} else {
mask &= ~bit;
}
ptp_qoriq->write(&regs->ctrl_regs->tmr_temask, mask);
spin_unlock_irqrestore(&ptp_qoriq->lock, flags);
return 0;
}
EXPORT_SYMBOL_GPL(ptp_qoriq_enable);
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,
};
/**
* ptp_qoriq_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 ptp_qoriq_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;
}
/**
* ptp_qoriq_auto_config - calculate a set of default configurations
*
* @ptp_qoriq: pointer to ptp_qoriq
* @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 ptp_qoriq_auto_config(struct ptp_qoriq *ptp_qoriq,
struct device_node *node)
{
struct clk *clk;
u64 freq_comp;
u64 max_adj;
u32 nominal_freq;
u32 remainder = 0;
u32 clk_src = 0;
ptp_qoriq->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 = ptp_qoriq_nominal_freq(clk_src);
if (!nominal_freq)
return -EINVAL;
ptp_qoriq->tclk_period = 1000000000UL / nominal_freq;
ptp_qoriq->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++;
ptp_qoriq->tmr_add = freq_comp;
ptp_qoriq->tmr_fiper1 = DEFAULT_FIPER1_PERIOD - ptp_qoriq->tclk_period;
ptp_qoriq->tmr_fiper2 = DEFAULT_FIPER2_PERIOD - ptp_qoriq->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;
ptp_qoriq->caps.max_adj = max_adj;
return 0;
}
int ptp_qoriq_init(struct ptp_qoriq *ptp_qoriq, void __iomem *base,
const struct ptp_clock_info *caps)
{
struct device_node *node = ptp_qoriq->dev->of_node;
struct ptp_qoriq_registers *regs;
struct timespec64 now;
unsigned long flags;
u32 tmr_ctrl;
if (!node)
return -ENODEV;
ptp_qoriq->base = base;
ptp_qoriq->caps = *caps;
if (of_property_read_u32(node, "fsl,cksel", &ptp_qoriq->cksel))
ptp_qoriq->cksel = DEFAULT_CKSEL;
if (of_property_read_bool(node, "fsl,extts-fifo"))
ptp_qoriq->extts_fifo_support = true;
else
ptp_qoriq->extts_fifo_support = false;
if (of_property_read_u32(node,
"fsl,tclk-period", &ptp_qoriq->tclk_period) ||
of_property_read_u32(node,
"fsl,tmr-prsc", &ptp_qoriq->tmr_prsc) ||
of_property_read_u32(node,
"fsl,tmr-add", &ptp_qoriq->tmr_add) ||
of_property_read_u32(node,
"fsl,tmr-fiper1", &ptp_qoriq->tmr_fiper1) ||
of_property_read_u32(node,
"fsl,tmr-fiper2", &ptp_qoriq->tmr_fiper2) ||
of_property_read_u32(node,
"fsl,max-adj", &ptp_qoriq->caps.max_adj)) {
pr_warn("device tree node missing required elements, try automatic configuration\n");
if (ptp_qoriq_auto_config(ptp_qoriq, node))
return -ENODEV;
}
if (of_property_read_bool(node, "little-endian")) {
ptp_qoriq->read = qoriq_read_le;
ptp_qoriq->write = qoriq_write_le;
} else {
ptp_qoriq->read = qoriq_read_be;
ptp_qoriq->write = qoriq_write_be;
}
/* The eTSEC uses differnt memory map with DPAA/ENETC */
if (of_device_is_compatible(node, "fsl,etsec-ptp")) {
ptp_qoriq->regs.ctrl_regs = base + ETSEC_CTRL_REGS_OFFSET;
ptp_qoriq->regs.alarm_regs = base + ETSEC_ALARM_REGS_OFFSET;
ptp_qoriq->regs.fiper_regs = base + ETSEC_FIPER_REGS_OFFSET;
ptp_qoriq->regs.etts_regs = base + ETSEC_ETTS_REGS_OFFSET;
} else {
ptp_qoriq->regs.ctrl_regs = base + CTRL_REGS_OFFSET;
ptp_qoriq->regs.alarm_regs = base + ALARM_REGS_OFFSET;
ptp_qoriq->regs.fiper_regs = base + FIPER_REGS_OFFSET;
ptp_qoriq->regs.etts_regs = base + ETTS_REGS_OFFSET;
}
spin_lock_init(&ptp_qoriq->lock);
ktime_get_real_ts64(&now);
ptp_qoriq_settime(&ptp_qoriq->caps, &now);
tmr_ctrl =
(ptp_qoriq->tclk_period & TCLK_PERIOD_MASK) << TCLK_PERIOD_SHIFT |
(ptp_qoriq->cksel & CKSEL_MASK) << CKSEL_SHIFT;
spin_lock_irqsave(&ptp_qoriq->lock, flags);
regs = &ptp_qoriq->regs;
ptp_qoriq->write(&regs->ctrl_regs->tmr_ctrl, tmr_ctrl);
ptp_qoriq->write(&regs->ctrl_regs->tmr_add, ptp_qoriq->tmr_add);
ptp_qoriq->write(&regs->ctrl_regs->tmr_prsc, ptp_qoriq->tmr_prsc);
ptp_qoriq->write(&regs->fiper_regs->tmr_fiper1, ptp_qoriq->tmr_fiper1);
ptp_qoriq->write(&regs->fiper_regs->tmr_fiper2, ptp_qoriq->tmr_fiper2);
set_alarm(ptp_qoriq);
ptp_qoriq->write(&regs->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(&regs->ctrl_regs->tmr_temask, 0);
ptp_qoriq->write(&regs->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 <richardcochran@gmail.com>");
MODULE_DESCRIPTION("PTP clock for Freescale QorIQ 1588 timer");
MODULE_LICENSE("GPL");