clkt2xxx_osc.c 1.3 KB

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  1. /*
  2. * OMAP2xxx osc_clk-specific clock code
  3. *
  4. * Copyright (C) 2005-2008 Texas Instruments, Inc.
  5. * Copyright (C) 2004-2010 Nokia Corporation
  6. *
  7. * Contacts:
  8. * Richard Woodruff <r-woodruff2@ti.com>
  9. * Paul Walmsley
  10. *
  11. * Based on earlier work by Tuukka Tikkanen, Tony Lindgren,
  12. * Gordon McNutt and RidgeRun, Inc.
  13. *
  14. * This program is free software; you can redistribute it and/or modify
  15. * it under the terms of the GNU General Public License version 2 as
  16. * published by the Free Software Foundation.
  17. */
  18. #undef DEBUG
  19. #include <linux/module.h>
  20. #include <linux/kernel.h>
  21. #include <linux/errno.h>
  22. #include <linux/clk.h>
  23. #include <linux/io.h>
  24. #include <plat/clock.h>
  25. #include "clock.h"
  26. #include "clock2xxx.h"
  27. #include "prm.h"
  28. #include "prm-regbits-24xx.h"
  29. static int omap2_enable_osc_ck(struct clk *clk)
  30. {
  31. u32 pcc;
  32. pcc = __raw_readl(prcm_clksrc_ctrl);
  33. __raw_writel(pcc & ~OMAP_AUTOEXTCLKMODE_MASK, prcm_clksrc_ctrl);
  34. return 0;
  35. }
  36. static void omap2_disable_osc_ck(struct clk *clk)
  37. {
  38. u32 pcc;
  39. pcc = __raw_readl(prcm_clksrc_ctrl);
  40. __raw_writel(pcc | OMAP_AUTOEXTCLKMODE_MASK, prcm_clksrc_ctrl);
  41. }
  42. const struct clkops clkops_oscck = {
  43. .enable = omap2_enable_osc_ck,
  44. .disable = omap2_disable_osc_ck,
  45. };
  46. unsigned long omap2_osc_clk_recalc(struct clk *clk)
  47. {
  48. return omap2xxx_get_apll_clkin() * omap2xxx_get_sysclkdiv();
  49. }