diff options
author | Sascha Hauer <s.hauer@pengutronix.de> | 2020-05-14 07:10:55 +0200 |
---|---|---|
committer | Sascha Hauer <s.hauer@pengutronix.de> | 2020-05-14 07:10:55 +0200 |
commit | cc31adf78d10eb1a5880ef51e240ab4273315e4b (patch) | |
tree | 4a33bb60a4e230634e60dfe7503e60c2536ecdcd /arch/powerpc/mach-mpc5xxx/speed.c | |
parent | e4ea8e8bfa7a37fea2d97c3d268206417e196bdf (diff) | |
parent | 992116ba3aeda6635c103ea2d04682bdd081fb4b (diff) | |
download | barebox-cc31adf78d10eb1a5880ef51e240ab4273315e4b.tar.gz barebox-cc31adf78d10eb1a5880ef51e240ab4273315e4b.tar.xz |
Merge branch 'for-next/kbuild'
Diffstat (limited to 'arch/powerpc/mach-mpc5xxx/speed.c')
-rw-r--r-- | arch/powerpc/mach-mpc5xxx/speed.c | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/arch/powerpc/mach-mpc5xxx/speed.c b/arch/powerpc/mach-mpc5xxx/speed.c new file mode 100644 index 0000000000..76a3019637 --- /dev/null +++ b/arch/powerpc/mach-mpc5xxx/speed.c @@ -0,0 +1,103 @@ +/* + * (C) Copyright 2000-2002 + * Wolfgang Denk, DENX Software Engineering, wd@denx.de. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * 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 program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include <common.h> +#include <mach/mpc5xxx.h> +#include <init.h> +#include <asm/processor.h> +#include <types.h> + +/* Bus-to-Core Multipliers */ + +static int bus2core[] = { + 3, 2, 2, 2, 4, 4, 5, 9, + 6, 11, 8, 10, 3, 12, 7, 0, + 6, 5, 13, 2, 14, 4, 15, 9, + 0, 11, 8, 10, 16, 12, 7, 0 +}; + +unsigned long get_bus_clock(void) +{ + unsigned long val, vco; + +#if !defined(CFG_MPC5XXX_CLKIN) +#error clock measuring not implemented yet - define CFG_MPC5XXX_CLKIN +#endif + + val = *(vu_long *)MPC5XXX_CDM_PORCFG; + if (val & (1 << 6)) + vco = CFG_MPC5XXX_CLKIN * 12; + else + vco = CFG_MPC5XXX_CLKIN * 16; + + if (val & (1 << 5)) + return vco / 8; + else + return vco / 4; +} + +unsigned long get_cpu_clock(void) +{ + unsigned long val; + val = *(vu_long *)MPC5XXX_CDM_PORCFG; + return get_bus_clock() * bus2core[val & 0x1f] / 2; +} + +unsigned long get_ipb_clock(void) +{ + unsigned long val; + + val = *(vu_long *)MPC5XXX_CDM_CFG; + if (val & (1 << 8)) + return get_bus_clock() / 2; + else + return get_bus_clock(); +} + +unsigned long get_pci_clock(void) +{ + unsigned long val; + + val = *(vu_long *)MPC5XXX_CDM_CFG; + switch (val & 3) { + case 0: + return get_ipb_clock(); + case 1: + return get_ipb_clock() / 2; + default: + return get_bus_clock() / 4; + } +} + +unsigned long get_timebase_clock(void) +{ + return (get_bus_clock() + 3L) / 4L; +} + +int prt_mpc5xxx_clks (void) +{ + printf(" Bus %ld MHz, IPB %ld MHz, PCI %ld MHz\n", + get_bus_clock() / 1000000, get_ipb_clock() / 1000000, + get_pci_clock() / 1000000); + + return 0; +} + +late_initcall(prt_mpc5xxx_clks); + |