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Linux/arch/mips/bcm47xx/time.c

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  1 /*
  2  *  Copyright (C) 2004 Florian Schirmer <jolt@tuxbox.org>
  3  *
  4  *  This program is free software; you can redistribute  it and/or modify it
  5  *  under  the terms of  the GNU General  Public License as published by the
  6  *  Free Software Foundation;  either version 2 of the  License, or (at your
  7  *  option) any later version.
  8  *
  9  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
 10  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 11  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 12  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
 13  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 14  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
 15  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 16  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
 17  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 18  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 19  *
 20  *  You should have received a copy of the  GNU General Public License along
 21  *  with this program; if not, write  to the Free Software Foundation, Inc.,
 22  *  675 Mass Ave, Cambridge, MA 02139, USA.
 23  */
 24 
 25 #include <linux/init.h>
 26 #include <linux/ssb/ssb.h>
 27 #include <asm/time.h>
 28 #include <bcm47xx.h>
 29 #include <bcm47xx_board.h>
 30 
 31 void __init plat_time_init(void)
 32 {
 33         unsigned long hz = 0;
 34         u16 chip_id = 0;
 35         char buf[10];
 36         int len;
 37         enum bcm47xx_board board = bcm47xx_board_get();
 38 
 39         /*
 40          * Use deterministic values for initial counter interrupt
 41          * so that calibrate delay avoids encountering a counter wrap.
 42          */
 43         write_c0_count(0);
 44         write_c0_compare(0xffff);
 45 
 46         switch (bcm47xx_bus_type) {
 47 #ifdef CONFIG_BCM47XX_SSB
 48         case BCM47XX_BUS_TYPE_SSB:
 49                 hz = ssb_cpu_clock(&bcm47xx_bus.ssb.mipscore) / 2;
 50                 chip_id = bcm47xx_bus.ssb.chip_id;
 51                 break;
 52 #endif
 53 #ifdef CONFIG_BCM47XX_BCMA
 54         case BCM47XX_BUS_TYPE_BCMA:
 55                 hz = bcma_cpu_clock(&bcm47xx_bus.bcma.bus.drv_mips) / 2;
 56                 chip_id = bcm47xx_bus.bcma.bus.chipinfo.id;
 57                 break;
 58 #endif
 59         }
 60 
 61         if (chip_id == 0x5354) {
 62                 len = bcm47xx_nvram_getenv("clkfreq", buf, sizeof(buf));
 63                 if (len >= 0 && !strncmp(buf, "200", 4))
 64                         hz = 100000000;
 65         }
 66 
 67         switch (board) {
 68         case BCM47XX_BOARD_ASUS_WL520GC:
 69         case BCM47XX_BOARD_ASUS_WL520GU:
 70                 hz = 100000000;
 71                 break;
 72         default:
 73                 break;
 74         }
 75 
 76         if (!hz)
 77                 hz = 100000000;
 78 
 79         /* Set MIPS counter frequency for fixed_rate_gettimeoffset() */
 80         mips_hpt_frequency = hz;
 81 }
 82 

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