diff options
Diffstat (limited to 'target/linux/ramips/patches-3.18/0066-cevt.patch')
| -rw-r--r-- | target/linux/ramips/patches-3.18/0066-cevt.patch | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/target/linux/ramips/patches-3.18/0066-cevt.patch b/target/linux/ramips/patches-3.18/0066-cevt.patch new file mode 100644 index 0000000..9eb6cb6 --- /dev/null +++ b/target/linux/ramips/patches-3.18/0066-cevt.patch @@ -0,0 +1,151 @@ +--- a/arch/mips/ralink/cevt-rt3352.c ++++ b/arch/mips/ralink/cevt-rt3352.c +@@ -45,18 +45,33 @@ static void (*systick_freq_scaling)(stru + static void systick_set_clock_mode(enum clock_event_mode mode, + struct clock_event_device *evt); + ++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) +@@ -66,20 +81,25 @@ 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_mode = systick_set_clock_mode, +@@ -126,13 +146,14 @@ static void systick_set_clock_mode(enum + systick_freq_scaling(sdev, 1); + break; + ++ case CLOCK_EVT_MODE_UNUSED: + case CLOCK_EVT_MODE_SHUTDOWN: + if (systick_freq_scaling) + systick_freq_scaling(sdev, 0); + 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); + break; + + default: +@@ -142,38 +163,45 @@ static void systick_set_clock_mode(enum + } + + 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); + } |