drivers/bcma/core.c

   1 /*
   2  * Broadcom specific AMBA
   3  * Core ops
   4  *
   5  * Licensed under the GNU/GPL. See COPYING for details.
   6  */
   7
   8 #include "bcma_private.h"
   9 #include <linux/bcma/bcma.h>
  10
  11 bool bcma_core_is_enabled(struct bcma_device *core)
  12 {
  13         if ((bcma_aread32(core, BCMA_IOCTL) & (BCMA_IOCTL_CLK | BCMA_IOCTL_FGC))
  14             != BCMA_IOCTL_CLK)
  15                 return false;
  16         if (bcma_aread32(core, BCMA_RESET_CTL) & BCMA_RESET_CTL_RESET)
  17                 return false;
  18         return true;
  19 }
  20 EXPORT_SYMBOL_GPL(bcma_core_is_enabled);
  21
  22 static void bcma_core_disable(struct bcma_device *core, u32 flags)
  23 {
  24         if (bcma_aread32(core, BCMA_RESET_CTL) & BCMA_RESET_CTL_RESET)
  25                 return;
  26
  27         bcma_awrite32(core, BCMA_IOCTL, flags);
  28         bcma_aread32(core, BCMA_IOCTL);
  29         udelay(10);
  30
  31         bcma_awrite32(core, BCMA_RESET_CTL, BCMA_RESET_CTL_RESET);
  32         udelay(1);
  33 }
  34
  35 int bcma_core_enable(struct bcma_device *core, u32 flags)
  36 {
  37         bcma_core_disable(core, flags);
  38
  39         bcma_awrite32(core, BCMA_IOCTL, (BCMA_IOCTL_CLK | BCMA_IOCTL_FGC | flags));
  40         bcma_aread32(core, BCMA_IOCTL);
  41
  42         bcma_awrite32(core, BCMA_RESET_CTL, 0);
  43         udelay(1);
  44
  45         bcma_awrite32(core, BCMA_IOCTL, (BCMA_IOCTL_CLK | flags));
  46         bcma_aread32(core, BCMA_IOCTL);
  47         udelay(1);
  48
  49         return 0;
  50 }
  51 EXPORT_SYMBOL_GPL(bcma_core_enable);