From 55fb6f3a05deb4a8b5e600cc10bae9555a9f90be Mon Sep 17 00:00:00 2001 From: John Crispin Date: Sun, 23 Jun 2013 15:50:49 +0000 Subject: ralink: update patches Signed-off-by: John Crispin SVN-Revision: 37016 --- ...-MIPS-ralink-add-support-for-systick-time.patch | 282 +++++++++++++++++++++ 1 file changed, 282 insertions(+) create mode 100644 target/linux/ramips/patches-3.8/0079-clocksource-MIPS-ralink-add-support-for-systick-time.patch (limited to 'target/linux/ramips/patches-3.8/0079-clocksource-MIPS-ralink-add-support-for-systick-time.patch') diff --git a/target/linux/ramips/patches-3.8/0079-clocksource-MIPS-ralink-add-support-for-systick-time.patch b/target/linux/ramips/patches-3.8/0079-clocksource-MIPS-ralink-add-support-for-systick-time.patch new file mode 100644 index 0000000000..32c96ec046 --- /dev/null +++ b/target/linux/ramips/patches-3.8/0079-clocksource-MIPS-ralink-add-support-for-systick-time.patch @@ -0,0 +1,282 @@ +From 4f3ae2a7ee1b1c9b9cab287c828f2ed7b1858495 Mon Sep 17 00:00:00 2001 +From: John Crispin +Date: Thu, 20 Jun 2013 19:21:52 +0200 +Subject: [PATCH 79/79] clocksource: MIPS: ralink: add support for systick + timer found on newer ralink SoC + +Signed-off-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 = container_of(evt, struct systick_device, dev); ++ u32 count; ++ ++ 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, ++}; ++ ++/* ugly hack */ ++#ifdef CONFIG_SOC_MT7620 ++ ++#define CLK_LUT_CFG 0x40 ++#define SLEEP_EN BIT(31) ++ ++static inline void mt7620_freq_scaling(struct systick_device *sdev, int status) ++{ ++ if (sdev->freq_scale == status) ++ return; ++ ++ sdev->freq_scale = status; ++ ++ pr_info("%s: %s autosleep mode\n", systick.dev.name, (status) ? ("enable") : ("disable")); ++ if (status) ++ rt_sysc_w32(rt_sysc_r32(CLK_LUT_CFG) | SLEEP_EN, CLK_LUT_CFG); ++ else ++ rt_sysc_w32(rt_sysc_r32(CLK_LUT_CFG) & ~SLEEP_EN, CLK_LUT_CFG); ++} ++#else ++static inline void mt7620_freq_scaling(struct systick_device *sdev, int status) {} ++#endif ++ ++static void systick_set_clock_mode(enum clock_event_mode mode, ++ struct clock_event_device *evt) ++{ ++ struct systick_device *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); ++ mt7620_freq_scaling(sdev, 1); ++ 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); ++ mt7620_freq_scaling(sdev, 0); ++ 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) { ++ pr_err("%s: of_iomap failed", np->name); ++ return; ++ } ++ ++ clocksource_mmio_init(systick.membase + SYSTICK_COUNT, np->name, ++ SYSTICK_FREQ, 301, 16, clocksource_mmio_readl_up); ++ ++ systick_irqaction.name = np->name; ++ systick.dev.name = np->name; ++ clockevent_set_clock(&systick.dev, SYSTICK_FREQ); ++ 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) ++ panic("%s: request_irq failed", np->name); ++ ++ 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); +-- +1.7.10.4 + -- cgit v1.2.3