firmware/src/picc/pll.c

   1 /* PLL routines for OpenPICC
   2  * (C) 2006 by Harald Welte <hwelte@hmw-consulting.de>
   3  *
   4  *  This program is free software; you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License as published by
   6  *  the Free Software Foundation; either version 2 of the License, or
   7  *  (at your option) any later version.
   8  *
   9  *  This program is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *  GNU General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License
  15  *  along with this program; if not, write to the Free Software
  16  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  *
  18  */
  19
  20
  21 #include <sys/types.h>
  22 #include <lib_AT91SAM7.h>
  23 #include <os/pio_irq.h>
  24 #include <os/dbgu.h>
  25 #include <os/led.h>
  26 #include "../openpcd.h"
  27
  28 void pll_inhibit(int inhibit)
  29 {
  30         if (inhibit)
  31                 AT91F_PIO_SetOutput(AT91C_BASE_PIOA, OPENPICC_PIO_PLL_INHIBIT);
  32         else
  33                 AT91F_PIO_ClearOutput(AT91C_BASE_PIOA, OPENPICC_PIO_PLL_INHIBIT);
  34 }
  35
  36 int pll_is_locked(void)
  37 {
  38         return AT91F_PIO_IsInputSet(AT91C_BASE_PIOA, OPENPICC_PIO_PLL_LOCK);
  39 }
  40
  41 static void pll_lock_change_cb(u_int32_t pio)
  42 {
  43         DEBUGPCRF("PLL LOCK: %d", pll_is_locked());
  44 #if 1
  45         if (pll_is_locked())
  46                 led_switch(2, 1);
  47         else
  48                 led_switch(2, 0);
  49 #endif
  50 }
  51
  52 void pll_init(void)
  53 {
  54         AT91F_PIO_CfgOutput(AT91C_BASE_PIOA, OPENPICC_PIO_PLL_INHIBIT);
  55         AT91F_PIO_CfgInput(AT91C_BASE_PIOA, OPENPICC_PIO_PLL_LOCK);
  56         pll_inhibit(0);
  57
  58         pio_irq_register(OPENPICC_PIO_PLL_LOCK, &pll_lock_change_cb);
  59         pio_irq_enable(OPENPICC_PIO_PLL_LOCK);
  60 }