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authorJohn Crispin <john@openwrt.org>2013-08-14 18:15:15 +0000
committerJohn Crispin <john@openwrt.org>2013-08-14 18:15:15 +0000
commit9e5b0cc19cebf6ed876c7eace13b887b46e518c0 (patch)
treef246f12adca3e91f5e3708e97c7a4add05cc0ce3 /target/linux/ramips/patches-3.10/0011-MIPS-ralink-add-support-for-systick-timer-found-on-n.patch
parent2864fb107f00531df0b114d52334d3e00fa5d6c2 (diff)
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ramips: update v3.10 patches
Sync the patches with those sent upstream for v3.12. Signed-off-by: John Crispin <blogic@openwrt.org> SVN-Revision: 37778
Diffstat (limited to 'target/linux/ramips/patches-3.10/0011-MIPS-ralink-add-support-for-systick-timer-found-on-n.patch')
-rw-r--r--target/linux/ramips/patches-3.10/0011-MIPS-ralink-add-support-for-systick-timer-found-on-n.patch192
1 files changed, 192 insertions, 0 deletions
diff --git a/target/linux/ramips/patches-3.10/0011-MIPS-ralink-add-support-for-systick-timer-found-on-n.patch b/target/linux/ramips/patches-3.10/0011-MIPS-ralink-add-support-for-systick-timer-found-on-n.patch
new file mode 100644
index 0000000..6d4911b
--- /dev/null
+++ b/target/linux/ramips/patches-3.10/0011-MIPS-ralink-add-support-for-systick-timer-found-on-n.patch
@@ -0,0 +1,192 @@
+From 3b511d972b556712f89ccc68825c0ec8f398dc5c Mon Sep 17 00:00:00 2001
+From: John Crispin <blogic@openwrt.org>
+Date: Sun, 28 Jul 2013 13:46:09 +0200
+Subject: [PATCH 11/25] MIPS: ralink: add support for systick timer found on
+ newer ralink SoC
+
+Newer Ralink SoC (MT7620x and RT5350) have a 50KHz clock that runs independent
+of the SoC master clock. If we want to automatic frequency scaling to work we
+need to use the systick timer as the clock source.
+
+Signed-off-by: John Crispin <blogic@openwrt.org>
+---
+ arch/mips/ralink/Kconfig | 7 ++
+ arch/mips/ralink/Makefile | 2 +
+ arch/mips/ralink/cevt-rt3352.c | 145 ++++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 154 insertions(+)
+ create mode 100644 arch/mips/ralink/cevt-rt3352.c
+
+--- a/arch/mips/ralink/Kconfig
++++ b/arch/mips/ralink/Kconfig
+@@ -1,5 +1,12 @@
+ if RALINK
+
++config CLKEVT_RT3352
++ bool
++ depends on SOC_RT305X || SOC_MT7620
++ default y
++ select CLKSRC_OF
++ select CLKSRC_MMIO
++
+ choice
+ prompt "Ralink SoC selection"
+ default SOC_RT305X
+--- a/arch/mips/ralink/Makefile
++++ b/arch/mips/ralink/Makefile
+@@ -8,6 +8,8 @@
+
+ obj-y := prom.o of.o reset.o clk.o irq.o timer.o
+
++obj-$(CONFIG_CLKEVT_RT3352) += cevt-rt3352.o
++
+ obj-$(CONFIG_SOC_RT288X) += rt288x.o
+ obj-$(CONFIG_SOC_RT305X) += rt305x.o
+ obj-$(CONFIG_SOC_RT3883) += rt3883.o
+--- /dev/null
++++ b/arch/mips/ralink/cevt-rt3352.c
+@@ -0,0 +1,145 @@
++/*
++ * This file is subject to the terms and conditions of the GNU General Public
++ * License. See the file "COPYING" in the main directory of this archive
++ * for more details.
++ *
++ * Copyright (C) 2013 by John Crispin <blogic@openwrt.org>
++ */
++
++#include <linux/clockchips.h>
++#include <linux/clocksource.h>
++#include <linux/interrupt.h>
++#include <linux/reset.h>
++#include <linux/init.h>
++#include <linux/time.h>
++#include <linux/of.h>
++#include <linux/of_irq.h>
++#include <linux/of_address.h>
++
++#include <asm/mach-ralink/ralink_regs.h>
++
++#define SYSTICK_FREQ (50 * 1000)
++
++#define SYSTICK_CONFIG 0x00
++#define SYSTICK_COMPARE 0x04
++#define SYSTICK_COUNT 0x08
++
++/* route systick irq to mips irq 7 instead of the r4k-timer */
++#define CFG_EXT_STK_EN 0x2
++/* enable the counter */
++#define CFG_CNT_EN 0x1
++
++struct systick_device {
++ void __iomem *membase;
++ struct clock_event_device dev;
++ int irq_requested;
++ int freq_scale;
++};
++
++static void systick_set_clock_mode(enum clock_event_mode mode,
++ struct clock_event_device *evt);
++
++static int systick_next_event(unsigned long delta,
++ struct clock_event_device *evt)
++{
++ struct systick_device *sdev;
++ u32 count;
++
++ sdev = container_of(evt, struct systick_device, dev);
++ count = ioread32(sdev->membase + SYSTICK_COUNT);
++ count = (count + delta) % SYSTICK_FREQ;
++ iowrite32(count + delta, sdev->membase + SYSTICK_COMPARE);
++
++ return 0;
++}
++
++static void systick_event_handler(struct clock_event_device *dev)
++{
++ /* noting to do here */
++}
++
++static irqreturn_t systick_interrupt(int irq, void *dev_id)
++{
++ struct clock_event_device *dev = (struct clock_event_device *) dev_id;
++
++ dev->event_handler(dev);
++
++ return IRQ_HANDLED;
++}
++
++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_mode = systick_set_clock_mode,
++ .event_handler = systick_event_handler,
++ },
++};
++
++static struct irqaction systick_irqaction = {
++ .handler = systick_interrupt,
++ .flags = IRQF_PERCPU | IRQF_TIMER,
++ .dev_id = &systick.dev,
++};
++
++static void systick_set_clock_mode(enum clock_event_mode mode,
++ struct clock_event_device *evt)
++{
++ struct systick_device *sdev;
++
++ sdev = container_of(evt, struct systick_device, dev);
++
++ switch (mode) {
++ case CLOCK_EVT_MODE_ONESHOT:
++ if (!sdev->irq_requested)
++ setup_irq(systick.dev.irq, &systick_irqaction);
++ sdev->irq_requested = 1;
++ iowrite32(CFG_EXT_STK_EN | CFG_CNT_EN,
++ systick.membase + SYSTICK_CONFIG);
++ break;
++
++ case CLOCK_EVT_MODE_SHUTDOWN:
++ if (sdev->irq_requested)
++ free_irq(systick.dev.irq, &systick_irqaction);
++ sdev->irq_requested = 0;
++ iowrite32(0, systick.membase + SYSTICK_CONFIG);
++ break;
++
++ default:
++ pr_err("%s: Unhandeled mips clock_mode\n", systick.dev.name);
++ break;
++ }
++}
++
++static void __init ralink_systick_init(struct device_node *np)
++{
++ systick.membase = of_iomap(np, 0);
++ if (!systick.membase)
++ return;
++
++ 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);
++ 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);
++
++ pr_info("%s: runing - mult: %d, shift: %d\n",
++ np->name, systick.dev.mult, systick.dev.shift);
++}
++
++CLOCKSOURCE_OF_DECLARE(systick, "ralink,cevt-systick", ralink_systick_init);