| wdenk | 945af8d | 2003-07-16 21:53:01 +0000 | [diff] [blame] | 1 | /* |
| 2 | * (C) Copyright 2000-2002 |
| 3 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. |
| 4 | * |
| 5 | * See file CREDITS for list of people who contributed to this |
| 6 | * project. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License as |
| 10 | * published by the Free Software Foundation; either version 2 of |
| 11 | * the License, or (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 21 | * MA 02111-1307 USA |
| 22 | */ |
| 23 | |
| 24 | #include <common.h> |
| 25 | #include <mpc5xxx.h> |
| 26 | #include <asm/processor.h> |
| 27 | |
| 28 | /* ------------------------------------------------------------------------- */ |
| 29 | |
| 30 | /* Bus-to-Core Multipliers */ |
| 31 | |
| 32 | static int bus2core[] = { |
| 33 | 0, 0, 0, 10, 20, 20, 25, 45, |
| 34 | 30, 55, 40, 50, 0, 60, 35, 0, |
| 35 | 30, 25, 65, 10, 70, 20, 75, 45, |
| 36 | 0, 55, 40, 50, 80, 60, 35, 0 |
| 37 | }; |
| 38 | /* ------------------------------------------------------------------------- */ |
| 39 | |
| 40 | /* |
| 41 | * |
| 42 | */ |
| 43 | |
| 44 | int get_clocks (void) |
| 45 | { |
| 46 | DECLARE_GLOBAL_DATA_PTR; |
| 47 | |
| 48 | ulong val, vco; |
| 49 | |
| 50 | #if !defined(CFG_MPC5XXX_CLKIN) |
| 51 | #error clock measuring not implemented yet - define CFG_MPC5XXX_CLKIN |
| 52 | #endif |
| 53 | |
| 54 | val = *(vu_long *)MPC5XXX_CDM_PORCFG; |
| 55 | if (val & (1 << 6)) { |
| 56 | vco = CFG_MPC5XXX_CLKIN * 12; |
| 57 | } else { |
| 58 | vco = CFG_MPC5XXX_CLKIN * 16; |
| 59 | } |
| 60 | if (val & (1 << 5)) { |
| 61 | gd->bus_clk = vco / 8; |
| 62 | } else { |
| 63 | gd->bus_clk = vco / 4; |
| 64 | } |
| 65 | gd->cpu_clk = gd->bus_clk * bus2core[val & 0x1f] / 10; |
| 66 | |
| 67 | val = *(vu_long *)MPC5XXX_CDM_CFG; |
| 68 | if (val & (1 << 8)) { |
| 69 | gd->ipb_clk = gd->bus_clk / 2; |
| 70 | } else { |
| 71 | gd->ipb_clk = gd->bus_clk; |
| 72 | } |
| 73 | switch (val & 3) { |
| 74 | case 0: gd->pci_clk = gd->ipb_clk; break; |
| 75 | case 1: gd->pci_clk = gd->ipb_clk / 2; break; |
| 76 | default: gd->pci_clk = gd->bus_clk / 4; break; |
| 77 | } |
| 78 | |
| 79 | return (0); |
| 80 | } |
| 81 | |
| 82 | int prt_mpc5xxx_clks (void) |
| 83 | { |
| 84 | DECLARE_GLOBAL_DATA_PTR; |
| 85 | |
| 86 | printf(" Bus %ld MHz, IPB %ld MHz, PCI %ld MHz\n", |
| 87 | gd->bus_clk / 1000000, gd->ipb_clk / 1000000, |
| 88 | gd->pci_clk / 1000000); |
| 89 | |
| 90 | return (0); |
| 91 | } |
| 92 | |
| 93 | /* ------------------------------------------------------------------------- */ |