1 | /* |
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2 | * (C) Copyright 2006 |
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3 | * Stefan Roese, DENX Software Engineering, sr@denx.de. |
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4 | * |
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5 | * (C) Copyright 2002 |
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6 | * Sysgo Real-Time Solutions, GmbH <www.elinos.com> |
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7 | * Marius Groeger <mgroeger@sysgo.de> |
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8 | * |
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9 | * (C) Copyright 2002 |
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10 | * Sysgo Real-Time Solutions, GmbH <www.elinos.com> |
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11 | * Alex Zuepke <azu@sysgo.de> |
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12 | * |
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13 | * See file CREDITS for list of people who contributed to this |
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14 | * project. |
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15 | * |
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16 | * This program is free software; you can redistribute it and/or |
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17 | * modify it under the terms of the GNU General Public License as |
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18 | * published by the Free Software Foundation; either version 2 of |
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19 | * the License, or (at your option) any later version. |
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20 | * |
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21 | * This program is distributed in the hope that it will be useful, |
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22 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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23 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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24 | * GNU General Public License for more details. |
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25 | * |
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26 | * You should have received a copy of the GNU General Public License |
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27 | * along with this program; if not, write to the Free Software |
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28 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
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29 | * MA 02111-1307 USA |
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30 | */ |
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31 | |
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32 | #include <common.h> |
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33 | #include <asm/arch/ixp425.h> |
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34 | |
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35 | #ifndef CONFIG_USE_IRQ |
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36 | ulong get_timer (ulong base) |
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37 | { |
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38 | return get_timer_masked () - base; |
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39 | } |
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40 | |
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41 | void ixp425_udelay(unsigned long usec) |
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42 | { |
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43 | /* |
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44 | * This function has a max usec, but since it is called from udelay |
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45 | * we should not have to worry... be happy |
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46 | */ |
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47 | unsigned long usecs = CFG_HZ/1000000L & ~IXP425_OST_RELOAD_MASK; |
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48 | |
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49 | *IXP425_OSST = IXP425_OSST_TIMER_1_PEND; |
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50 | usecs |= IXP425_OST_ONE_SHOT | IXP425_OST_ENABLE; |
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51 | *IXP425_OSRT1 = usecs; |
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52 | while (!(*IXP425_OSST & IXP425_OSST_TIMER_1_PEND)); |
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53 | } |
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54 | |
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55 | void udelay (unsigned long usec) |
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56 | { |
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57 | while (usec--) ixp425_udelay(1); |
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58 | } |
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59 | |
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60 | static ulong reload_constant = 0xfffffff0; |
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61 | |
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62 | void reset_timer_masked (void) |
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63 | { |
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64 | ulong reload = reload_constant | IXP425_OST_ONE_SHOT | IXP425_OST_ENABLE; |
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65 | |
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66 | *IXP425_OSST = IXP425_OSST_TIMER_1_PEND; |
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67 | *IXP425_OSRT1 = reload; |
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68 | } |
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69 | |
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70 | ulong get_timer_masked (void) |
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71 | { |
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72 | /* |
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73 | * Note that it is possible for this to wrap! |
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74 | * In this case we return max. |
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75 | */ |
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76 | ulong current = *IXP425_OST1; |
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77 | if (*IXP425_OSST & IXP425_OSST_TIMER_1_PEND) |
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78 | { |
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79 | return reload_constant; |
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80 | } |
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81 | return (reload_constant - current); |
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82 | } |
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83 | #endif /* #ifndef CONFIG_USE_IRQ */ |
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