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6d2170be45
This adds supports to the "extended" DCR addressing via the indirect mfdcrx/mtdcrx instructions supported by some 4xx cores (440H6 and later). I enabled the feature for now only on AMCC 460 chips. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Josh Boyer <jwboyer@linux.vnet.ibm.com> Acked-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
155 lines
4.4 KiB
C
155 lines
4.4 KiB
C
/*
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* (c) Copyright 2006 Benjamin Herrenschmidt, IBM Corp.
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* <benh@kernel.crashing.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _ASM_POWERPC_DCR_NATIVE_H
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#define _ASM_POWERPC_DCR_NATIVE_H
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#ifdef __KERNEL__
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#ifndef __ASSEMBLY__
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#include <linux/spinlock.h>
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#include <asm/cputable.h>
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typedef struct {
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unsigned int base;
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} dcr_host_native_t;
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static inline bool dcr_map_ok_native(dcr_host_native_t host)
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{
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return 1;
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}
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#define dcr_map_native(dev, dcr_n, dcr_c) \
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((dcr_host_native_t){ .base = (dcr_n) })
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#define dcr_unmap_native(host, dcr_c) do {} while (0)
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#define dcr_read_native(host, dcr_n) mfdcr(dcr_n + host.base)
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#define dcr_write_native(host, dcr_n, value) mtdcr(dcr_n + host.base, value)
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/* Table based DCR accessors */
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extern void __mtdcr(unsigned int reg, unsigned int val);
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extern unsigned int __mfdcr(unsigned int reg);
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/* mfdcrx/mtdcrx instruction based accessors. We hand code
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* the opcodes in order not to depend on newer binutils
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*/
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static inline unsigned int mfdcrx(unsigned int reg)
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{
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unsigned int ret;
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asm volatile(".long 0x7c000206 | (%0 << 21) | (%1 << 16)"
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: "=r" (ret) : "r" (reg));
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return ret;
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}
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static inline void mtdcrx(unsigned int reg, unsigned int val)
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{
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asm volatile(".long 0x7c000306 | (%0 << 21) | (%1 << 16)"
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: : "r" (val), "r" (reg));
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}
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#define mfdcr(rn) \
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({unsigned int rval; \
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if (__builtin_constant_p(rn) && rn < 1024) \
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asm volatile("mfdcr %0," __stringify(rn) \
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: "=r" (rval)); \
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else if (likely(cpu_has_feature(CPU_FTR_INDEXED_DCR))) \
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rval = mfdcrx(rn); \
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else \
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rval = __mfdcr(rn); \
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rval;})
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#define mtdcr(rn, v) \
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do { \
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if (__builtin_constant_p(rn) && rn < 1024) \
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asm volatile("mtdcr " __stringify(rn) ",%0" \
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: : "r" (v)); \
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else if (likely(cpu_has_feature(CPU_FTR_INDEXED_DCR))) \
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mtdcrx(rn, v); \
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else \
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__mtdcr(rn, v); \
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} while (0)
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/* R/W of indirect DCRs make use of standard naming conventions for DCRs */
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extern spinlock_t dcr_ind_lock;
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static inline unsigned __mfdcri(int base_addr, int base_data, int reg)
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{
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unsigned long flags;
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unsigned int val;
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spin_lock_irqsave(&dcr_ind_lock, flags);
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if (cpu_has_feature(CPU_FTR_INDEXED_DCR)) {
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mtdcrx(base_addr, reg);
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val = mfdcrx(base_data);
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} else {
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__mtdcr(base_addr, reg);
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val = __mfdcr(base_data);
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}
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spin_unlock_irqrestore(&dcr_ind_lock, flags);
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return val;
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}
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static inline void __mtdcri(int base_addr, int base_data, int reg,
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unsigned val)
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{
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unsigned long flags;
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spin_lock_irqsave(&dcr_ind_lock, flags);
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if (cpu_has_feature(CPU_FTR_INDEXED_DCR)) {
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mtdcrx(base_addr, reg);
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mtdcrx(base_data, val);
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} else {
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__mtdcr(base_addr, reg);
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__mtdcr(base_data, val);
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}
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spin_unlock_irqrestore(&dcr_ind_lock, flags);
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}
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static inline void __dcri_clrset(int base_addr, int base_data, int reg,
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unsigned clr, unsigned set)
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{
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unsigned long flags;
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unsigned int val;
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spin_lock_irqsave(&dcr_ind_lock, flags);
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if (cpu_has_feature(CPU_FTR_INDEXED_DCR)) {
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mtdcrx(base_addr, reg);
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val = (mfdcrx(base_data) & ~clr) | set;
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mtdcrx(base_data, val);
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} else {
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__mtdcr(base_addr, reg);
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val = (__mfdcr(base_data) & ~clr) | set;
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__mtdcr(base_data, val);
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}
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spin_unlock_irqrestore(&dcr_ind_lock, flags);
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}
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#define mfdcri(base, reg) __mfdcri(DCRN_ ## base ## _CONFIG_ADDR, \
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DCRN_ ## base ## _CONFIG_DATA, \
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reg)
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#define mtdcri(base, reg, data) __mtdcri(DCRN_ ## base ## _CONFIG_ADDR, \
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DCRN_ ## base ## _CONFIG_DATA, \
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reg, data)
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#define dcri_clrset(base, reg, clr, set) __dcri_clrset(DCRN_ ## base ## _CONFIG_ADDR, \
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DCRN_ ## base ## _CONFIG_DATA, \
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reg, clr, set)
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#endif /* __ASSEMBLY__ */
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_DCR_NATIVE_H */
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