diff options
Diffstat (limited to 'arch/powerpc/kernel/cpu_setup_44x.S')
| -rw-r--r-- | arch/powerpc/kernel/cpu_setup_44x.S | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/cpu_setup_44x.S b/arch/powerpc/kernel/cpu_setup_44x.S new file mode 100644 index 000000000..e1d705ea2 --- /dev/null +++ b/arch/powerpc/kernel/cpu_setup_44x.S @@ -0,0 +1,69 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * This file contains low level CPU setup functions. + * Valentine Barshak <vbarshak@ru.mvista.com> + * MontaVista Software, Inc (c) 2007 + * + * Based on cpu_setup_6xx code by + * Benjamin Herrenschmidt <benh@kernel.crashing.org> + */ + +#include <asm/processor.h> +#include <asm/cputable.h> +#include <asm/ppc_asm.h> + +_GLOBAL(__setup_cpu_440ep) + b __init_fpu_44x +_GLOBAL(__setup_cpu_440epx) + mflr r4 + bl __init_fpu_44x + bl __plb_disable_wrp + bl __fixup_440A_mcheck + mtlr r4 + blr +_GLOBAL(__setup_cpu_440grx) + mflr r4 + bl __plb_disable_wrp + bl __fixup_440A_mcheck + mtlr r4 + blr +_GLOBAL(__setup_cpu_460ex) +_GLOBAL(__setup_cpu_460gt) +_GLOBAL(__setup_cpu_460sx) +_GLOBAL(__setup_cpu_apm821xx) + mflr r4 + bl __init_fpu_44x + bl __fixup_440A_mcheck + mtlr r4 + blr + +_GLOBAL(__setup_cpu_440x5) +_GLOBAL(__setup_cpu_440gx) +_GLOBAL(__setup_cpu_440spe) + b __fixup_440A_mcheck + +/* enable APU between CPU and FPU */ +_GLOBAL(__init_fpu_44x) + mfspr r3,SPRN_CCR0 + /* Clear DAPUIB flag in CCR0 */ + rlwinm r3,r3,0,12,10 + mtspr SPRN_CCR0,r3 + isync + blr + +/* + * Workaround for the incorrect write to DDR SDRAM errata. + * The write address can be corrupted during writes to + * DDR SDRAM when write pipelining is enabled on PLB0. + * Disable write pipelining here. + */ +#define DCRN_PLB4A0_ACR 0x81 + +_GLOBAL(__plb_disable_wrp) + mfdcr r3,DCRN_PLB4A0_ACR + /* clear WRP bit in PLB4A0_ACR */ + rlwinm r3,r3,0,8,6 + mtdcr DCRN_PLB4A0_ACR,r3 + isync + blr + |