From 9e5b0cc19cebf6ed876c7eace13b887b46e518c0 Mon Sep 17 00:00:00 2001 From: John Crispin Date: Wed, 14 Aug 2013 18:15:15 +0000 Subject: ramips: update v3.10 patches Sync the patches with those sent upstream for v3.12. Signed-off-by: John Crispin SVN-Revision: 37778 --- ...-add-support-for-systick-timer-found-on-n.patch | 192 +++++++++++++++++++++ 1 file changed, 192 insertions(+) create mode 100644 target/linux/ramips/patches-3.10/0011-MIPS-ralink-add-support-for-systick-timer-found-on-n.patch (limited to 'target/linux/ramips/patches-3.10/0011-MIPS-ralink-add-support-for-systick-timer-found-on-n.patch') 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 0000000000..6d4911b428 --- /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 +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 +--- + 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 ++ */ ++ ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++ ++#include ++ ++#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); -- cgit v1.2.3