| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 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 | } |