^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * This file is subject to the terms and conditions of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * License. See the file "COPYING" in the main directory of this archive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C) 2013 by John Crispin <john@phrozen.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/clockchips.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/clocksource.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/reset.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/time.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/of_irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/of_address.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <asm/mach-ralink/ralink_regs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #define SYSTICK_FREQ (50 * 1000)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define SYSTICK_CONFIG 0x00
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define SYSTICK_COMPARE 0x04
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define SYSTICK_COUNT 0x08
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) /* route systick irq to mips irq 7 instead of the r4k-timer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #define CFG_EXT_STK_EN 0x2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) /* enable the counter */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #define CFG_CNT_EN 0x1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) struct systick_device {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) void __iomem *membase;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct clock_event_device dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) int irq_requested;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) int freq_scale;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) static int systick_set_oneshot(struct clock_event_device *evt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) static int systick_shutdown(struct clock_event_device *evt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) static int systick_next_event(unsigned long delta,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) struct clock_event_device *evt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct systick_device *sdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) u32 count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) sdev = container_of(evt, struct systick_device, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) count = ioread32(sdev->membase + SYSTICK_COUNT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) count = (count + delta) % SYSTICK_FREQ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) iowrite32(count, sdev->membase + SYSTICK_COMPARE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) static void systick_event_handler(struct clock_event_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) /* noting to do here */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) static irqreturn_t systick_interrupt(int irq, void *dev_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) struct clock_event_device *dev = (struct clock_event_device *) dev_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) dev->event_handler(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) static struct systick_device systick = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) .dev = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) * cevt-r4k uses 300, make sure systick
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) * gets used if available
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) .rating = 310,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) .features = CLOCK_EVT_FEAT_ONESHOT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) .set_next_event = systick_next_event,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) .set_state_shutdown = systick_shutdown,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) .set_state_oneshot = systick_set_oneshot,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) .event_handler = systick_event_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) static int systick_shutdown(struct clock_event_device *evt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) struct systick_device *sdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) sdev = container_of(evt, struct systick_device, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) if (sdev->irq_requested)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) free_irq(systick.dev.irq, &systick.dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) sdev->irq_requested = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) iowrite32(0, systick.membase + SYSTICK_CONFIG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) static int systick_set_oneshot(struct clock_event_device *evt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) const char *name = systick.dev.name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) struct systick_device *sdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) int irq = systick.dev.irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) sdev = container_of(evt, struct systick_device, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) if (!sdev->irq_requested) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) if (request_irq(irq, systick_interrupt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) IRQF_PERCPU | IRQF_TIMER, name, &systick.dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) pr_err("Failed to request irq %d (%s)\n", irq, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) sdev->irq_requested = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) iowrite32(CFG_EXT_STK_EN | CFG_CNT_EN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) systick.membase + SYSTICK_CONFIG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) static int __init ralink_systick_init(struct device_node *np)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) systick.membase = of_iomap(np, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) if (!systick.membase)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) return -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) systick.dev.name = np->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) clockevents_calc_mult_shift(&systick.dev, SYSTICK_FREQ, 60);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) systick.dev.max_delta_ns = clockevent_delta2ns(0x7fff, &systick.dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) systick.dev.max_delta_ticks = 0x7fff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) systick.dev.min_delta_ns = clockevent_delta2ns(0x3, &systick.dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) systick.dev.min_delta_ticks = 0x3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) systick.dev.irq = irq_of_parse_and_map(np, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) if (!systick.dev.irq) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) pr_err("%pOFn: request_irq failed", np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) ret = clocksource_mmio_init(systick.membase + SYSTICK_COUNT, np->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) SYSTICK_FREQ, 301, 16,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) clocksource_mmio_readl_up);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) clockevents_register_device(&systick.dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) pr_info("%pOFn: running - mult: %d, shift: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) np, systick.dev.mult, systick.dev.shift);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) TIMER_OF_DECLARE(systick, "ralink,cevt-systick", ralink_systick_init);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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