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