target/linux/ifxmips/files/arch/mips/ifxmips/danube/cgu.c

   1 #include <linux/kernel.h>
   2 #include <linux/module.h>
   3 #include <linux/version.h>
   4 #include <linux/types.h>
   5 #include <linux/fs.h>
   6 #include <linux/miscdevice.h>
   7 #include <linux/init.h>
   8 #include <linux/uaccess.h>
   9 #include <linux/unistd.h>
  10 #include <linux/errno.h>
  11
  12 #include <asm/irq.h>
  13 #include <asm/div64.h>
  14
  15 #include <ifxmips.h>
  16 #include <ifxmips_cgu.h>
  17
  18 void
  19 cgu_setup_pci_clk(int external_clock)
  20 {
  21         /* set clock to 33Mhz */
  22         ifxmips_w32(ifxmips_r32(IFXMIPS_CGU_IFCCR) & ~0xf00000,
  23                 IFXMIPS_CGU_IFCCR);
  24         ifxmips_w32(ifxmips_r32(IFXMIPS_CGU_IFCCR) | 0x800000,
  25                 IFXMIPS_CGU_IFCCR);
  26         if (external_clock)
  27         {
  28                 ifxmips_w32(ifxmips_r32(IFXMIPS_CGU_IFCCR) & ~(1 << 16),
  29                         IFXMIPS_CGU_IFCCR);
  30                 ifxmips_w32((1 << 30), IFXMIPS_CGU_PCICR);
  31         } else {
  32                 ifxmips_w32(ifxmips_r32(IFXMIPS_CGU_IFCCR) | (1 << 16),
  33                         IFXMIPS_CGU_IFCCR);
  34                 ifxmips_w32((1 << 31) | (1 << 30), IFXMIPS_CGU_PCICR);
  35         }
  36 }
  37
  38