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From e6ed424c36458aff8738fb1fbb0141196678058a Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Mon, 7 Dec 2015 17:17:23 +0100
Subject: [PATCH 14/53] arch: mips: cleanup cevt-rt3352
Signed-off-by: John Crispin <blogic@openwrt.org>
---
arch/mips/ralink/cevt-rt3352.c | 85 ++++++++++++++++++++++++++--------------
1 file changed, 56 insertions(+), 29 deletions(-)
diff --git a/arch/mips/ralink/cevt-rt3352.c b/arch/mips/ralink/cevt-rt3352.c
index cecf44f..424635c 100644
--- a/arch/mips/ralink/cevt-rt3352.c
+++ b/arch/mips/ralink/cevt-rt3352.c
@@ -52,7 +52,7 @@ static inline void mt7620_freq_scaling(struct systick_device *sdev, int status)
sdev->freq_scale = status;
- pr_info("%s: %s autosleep mode\n", systick.dev.name,
+ pr_info("%s: %s autosleep mode\n", sdev->dev.name,
(status) ? ("enable") : ("disable"));
if (status)
rt_sysc_w32(rt_sysc_r32(CLK_LUT_CFG) | SLEEP_EN, CLK_LUT_CFG);
@@ -60,18 +60,33 @@ static inline void mt7620_freq_scaling(struct systick_device *sdev, int status)
rt_sysc_w32(rt_sysc_r32(CLK_LUT_CFG) & ~SLEEP_EN, CLK_LUT_CFG);
}
+static inline unsigned int read_count(struct systick_device *sdev)
+{
+ return ioread32(sdev->membase + SYSTICK_COUNT);
+}
+
+static inline unsigned int read_compare(struct systick_device *sdev)
+{
+ return ioread32(sdev->membase + SYSTICK_COMPARE);
+}
+
+static inline void write_compare(struct systick_device *sdev, unsigned int val)
+{
+ iowrite32(val, sdev->membase + SYSTICK_COMPARE);
+}
+
static int systick_next_event(unsigned long delta,
struct clock_event_device *evt)
{
struct systick_device *sdev;
- u32 count;
+ int res;
sdev = container_of(evt, struct systick_device, dev);
- count = ioread32(sdev->membase + SYSTICK_COUNT);
- count = (count + delta) % SYSTICK_FREQ;
- iowrite32(count, sdev->membase + SYSTICK_COMPARE);
+ delta += read_count(sdev);
+ write_compare(sdev, delta);
+ res = ((int)(read_count(sdev) - delta) >= 0) ? -ETIME : 0;
- return 0;
+ return res;
}
static void systick_event_handler(struct clock_event_device *dev)
@@ -81,20 +96,25 @@ static void systick_event_handler(struct clock_event_device *dev)
static irqreturn_t systick_interrupt(int irq, void *dev_id)
{
- struct clock_event_device *dev = (struct clock_event_device *) dev_id;
+ int ret = 0;
+ struct clock_event_device *cdev;
+ struct systick_device *sdev;
+
+ if (read_c0_cause() & STATUSF_IP7) {
+ cdev = (struct clock_event_device *) dev_id;
+ sdev = container_of(cdev, struct systick_device, dev);
- dev->event_handler(dev);
+ /* Clear Count/Compare Interrupt */
+ write_compare(sdev, read_compare(sdev));
+ cdev->event_handler(cdev);
+ ret = 1;
+ }
- return IRQ_HANDLED;
+ return IRQ_RETVAL(ret);
}
static struct systick_device systick = {
.dev = {
- /*
- * cevt-r4k uses 300, make sure systick
- * gets used if available
- */
- .rating = 310,
.features = CLOCK_EVT_FEAT_ONESHOT,
.set_next_event = systick_next_event,
.set_state_shutdown = systick_shutdown,
@@ -116,9 +136,9 @@ static int systick_shutdown(struct clock_event_device *evt)
sdev = container_of(evt, struct systick_device, dev);
if (sdev->irq_requested)
- free_irq(systick.dev.irq, &systick_irqaction);
+ remove_irq(systick.dev.irq, &systick_irqaction);
sdev->irq_requested = 0;
- iowrite32(0, systick.membase + SYSTICK_CONFIG);
+ iowrite32(CFG_CNT_EN, systick.membase + SYSTICK_CONFIG);
if (systick_freq_scaling)
systick_freq_scaling(sdev, 0);
@@ -145,38 +165,45 @@ static int systick_set_oneshot(struct clock_event_device *evt)
}
static const struct of_device_id systick_match[] = {
- { .compatible = "ralink,mt7620-systick", .data = mt7620_freq_scaling},
+ { .compatible = "ralink,mt7620a-systick", .data = mt7620_freq_scaling},
{},
};
static void __init ralink_systick_init(struct device_node *np)
{
const struct of_device_id *match;
+ int rating = 200;
systick.membase = of_iomap(np, 0);
if (!systick.membase)
return;
match = of_match_node(systick_match, np);
- if (match)
+ if (match) {
systick_freq_scaling = match->data;
+ /*
+ * cevt-r4k uses 300, make sure systick
+ * gets used if available
+ */
+ rating = 310;
+ }
- systick_irqaction.name = np->name;
- systick.dev.name = np->name;
- clockevents_calc_mult_shift(&systick.dev, SYSTICK_FREQ, 60);
- systick.dev.max_delta_ns = clockevent_delta2ns(0x7fff, &systick.dev);
- systick.dev.min_delta_ns = clockevent_delta2ns(0x3, &systick.dev);
+ /* enable counter than register clock source */
+ iowrite32(CFG_CNT_EN, systick.membase + SYSTICK_CONFIG);
+ clocksource_mmio_init(systick.membase + SYSTICK_COUNT, np->name,
+ SYSTICK_FREQ, rating, 16, clocksource_mmio_readl_up);
+
+ /* register clock event */
systick.dev.irq = irq_of_parse_and_map(np, 0);
if (!systick.dev.irq) {
pr_err("%s: request_irq failed", np->name);
return;
}
-
- clocksource_mmio_init(systick.membase + SYSTICK_COUNT, np->name,
- SYSTICK_FREQ, 301, 16, clocksource_mmio_readl_up);
-
- clockevents_register_device(&systick.dev);
-
+ systick_irqaction.name = np->name;
+ systick.dev.name = np->name;
+ systick.dev.rating = rating;
+ systick.dev.cpumask = cpumask_of(0);
+ clockevents_config_and_register(&systick.dev, SYSTICK_FREQ, 0x3, 0x7fff);
pr_info("%s: running - mult: %d, shift: %d\n",
np->name, systick.dev.mult, systick.dev.shift);
}
--
1.7.10.4
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