ramips: add linux 4.4 support, update mt7621 subtarget to 4.4

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 48951

1 files changed, 165 insertions, 0 deletions

diff --git a/target/linux/ramips/patches-4.4/0014-arch-mips-cleanup-cevt-rt3352.patch b/target/linux/ramips/patches-4.4/0014-arch-mips-cleanup-cevt-rt3352.patch
new file mode 100644
index 0000000000..50b3dc8318
--- /dev/null
+++ b/target/linux/ramips/patches-4.4/0014-arch-mips-cleanup-cevt-rt3352.patch
@@ -0,0 +1,165 @@
+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(-)
+
+--- a/arch/mips/ralink/cevt-rt3352.c
++++ b/arch/mips/ralink/cevt-rt3352.c
+@@ -52,7 +52,7 @@ static inline void mt7620_freq_scaling(s
+ 
+ 	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(s
+ 		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
+ 
+ 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;
+ 
+-	dev->event_handler(dev);
++	if (read_c0_cause() & STATUSF_IP7) {
++		cdev = (struct clock_event_device *) dev_id;
++		sdev = container_of(cdev, struct systick_device, 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
+ 	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 cl
+ }
+ 
+ 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);
+ }