/* * Copyright (C) 2004 Florian Schirmer <jolt@tuxbox.org> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 675 Mass Ave, Cambridge, MA 02139, USA. */ #include <linux/init.h> #include <linux/ssb/ssb.h> #include <asm/time.h> #include <bcm47xx.h> #include <bcm47xx_board.h> void __init plat_time_init(void) { unsigned long hz = 0; u16 chip_id = 0; char buf[10]; int len; enum bcm47xx_board board = bcm47xx_board_get(); /* * Use deterministic values for initial counter interrupt * so that calibrate delay avoids encountering a counter wrap. */ write_c0_count(0); write_c0_compare(0xffff); switch (bcm47xx_bus_type) { #ifdef CONFIG_BCM47XX_SSB case BCM47XX_BUS_TYPE_SSB: hz = ssb_cpu_clock(&bcm47xx_bus.ssb.mipscore) / 2; chip_id = bcm47xx_bus.ssb.chip_id; break; #endif #ifdef CONFIG_BCM47XX_BCMA case BCM47XX_BUS_TYPE_BCMA: hz = bcma_cpu_clock(&bcm47xx_bus.bcma.bus.drv_mips) / 2; chip_id = bcm47xx_bus.bcma.bus.chipinfo.id; break; #endif } if (chip_id == 0x5354) { len = bcm47xx_nvram_getenv("clkfreq", buf, sizeof(buf)); if (len >= 0 && !strncmp(buf, "200", 4)) hz = 100000000; } switch (board) { case BCM47XX_BOARD_ASUS_WL520GC: case BCM47XX_BOARD_ASUS_WL520GU: hz = 100000000; break; default: break; } if (!hz) hz = 100000000; /* Set MIPS counter frequency for fixed_rate_gettimeoffset() */ mips_hpt_frequency = hz; }