projects / people / ms / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| 945af8d7 WD |
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 | ||
| d87080b7 WD |
28 | DECLARE_GLOBAL_DATA_PTR; |
| 29 | ||
| 945af8d7 WD |
30 | /* ------------------------------------------------------------------------- */ |
| 31 | ||
| 32 | /* Bus-to-Core Multipliers */ | |
| 33 | ||
| 34 | static int bus2core[] = { | |
| 7cb22f97 WD |
35 | 3, 2, 2, 2, 4, 4, 5, 9, |
| 36 | 6, 11, 8, 10, 3, 12, 7, 0, | |
| 37 | 6, 5, 13, 2, 14, 4, 15, 9, | |
| 38 | 0, 11, 8, 10, 16, 12, 7, 0 | |
| 945af8d7 WD |
39 | }; |
| 40 | /* ------------------------------------------------------------------------- */ | |
| 41 | ||
| 42 | /* | |
| 43 | * | |
| 44 | */ | |
| 45 | ||
| 46 | int get_clocks (void) | |
| 47 | { | |
| 945af8d7 WD |
48 | ulong val, vco; |
| 49 | ||
| 6d0f6bcf JCPV |
50 | #if !defined(CONFIG_SYS_MPC5XXX_CLKIN) |
| 51 | #error clock measuring not implemented yet - define CONFIG_SYS_MPC5XXX_CLKIN | |
| 945af8d7 WD |
52 | #endif |
| 53 | ||
| 54 | val = *(vu_long *)MPC5XXX_CDM_PORCFG; | |
| 55 | if (val & (1 << 6)) { | |
| 6d0f6bcf | 56 | vco = CONFIG_SYS_MPC5XXX_CLKIN * 12; |
| 945af8d7 | 57 | } else { |
| 6d0f6bcf | 58 | vco = CONFIG_SYS_MPC5XXX_CLKIN * 16; |
| 945af8d7 WD |
59 | } |
| 60 | if (val & (1 << 5)) { | |
| 61 | gd->bus_clk = vco / 8; | |
| 62 | } else { | |
| 63 | gd->bus_clk = vco / 4; | |
| 64 | } | |
| 7cb22f97 | 65 | gd->cpu_clk = gd->bus_clk * bus2core[val & 0x1f] / 2; |
| 945af8d7 WD |
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 | { | |
| 945af8d7 WD |
84 | printf(" Bus %ld MHz, IPB %ld MHz, PCI %ld MHz\n", |
| 85 | gd->bus_clk / 1000000, gd->ipb_clk / 1000000, | |
| 86 | gd->pci_clk / 1000000); | |
| 87 | ||
| 88 | return (0); | |
| 89 | } | |
| 90 | ||
| 91 | /* ------------------------------------------------------------------------- */ |