timer-versatile.c 866 B

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. *
  4. * Copyright (C) 2014 ARM Limited
  5. */
  6. #include <linux/clocksource.h>
  7. #include <linux/io.h>
  8. #include <linux/of.h>
  9. #include <linux/of_address.h>
  10. #include <linux/sched_clock.h>
  11. #define SYS_24MHZ 0x05c
  12. static void __iomem *versatile_sys_24mhz;
  13. static u64 notrace versatile_sys_24mhz_read(void)
  14. {
  15. return readl(versatile_sys_24mhz);
  16. }
  17. static int __init versatile_sched_clock_init(struct device_node *node)
  18. {
  19. void __iomem *base = of_iomap(node, 0);
  20. of_node_clear_flag(node, OF_POPULATED);
  21. if (!base)
  22. return -ENXIO;
  23. versatile_sys_24mhz = base + SYS_24MHZ;
  24. sched_clock_register(versatile_sys_24mhz_read, 32, 24000000);
  25. return 0;
  26. }
  27. TIMER_OF_DECLARE(vexpress, "arm,vexpress-sysreg",
  28. versatile_sched_clock_init);
  29. TIMER_OF_DECLARE(versatile, "arm,versatile-sysreg",
  30. versatile_sched_clock_init);