0e6140a56f
Accessing indirect DCRs is done via a pair of address/data DCRs. Such accesses are thus inherently racy, vs. interrupts, preemption and possibly SMP if 4xx SMP cores are ever used. This updates the mfdcri/mtdcri macros in dcr-native.h (which were so far unused) to use a spinlock. In addition, add some common definitions to a new dcr-regs.h file. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
84 lines
2.6 KiB
C
84 lines
2.6 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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typedef struct {
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unsigned int base;
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} dcr_host_t;
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#define DCR_MAP_OK(host) (1)
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#define dcr_map(dev, dcr_n, dcr_c) ((dcr_host_t){ .base = (dcr_n) })
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#define dcr_unmap(host, dcr_c) do {} while (0)
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#define dcr_read(host, dcr_n) mfdcr(dcr_n + host.base)
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#define dcr_write(host, dcr_n, value) mtdcr(dcr_n + host.base, value)
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/* Device Control Registers */
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void __mtdcr(int reg, unsigned int val);
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unsigned int __mfdcr(int reg);
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#define mfdcr(rn) \
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({unsigned int rval; \
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if (__builtin_constant_p(rn)) \
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asm volatile("mfdcr %0," __stringify(rn) \
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: "=r" (rval)); \
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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)) \
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asm volatile("mtdcr " __stringify(rn) ",%0" \
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: : "r" (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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#define mfdcri(base, 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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mtdcr(DCRN_ ## base ## _CONFIG_ADDR, reg); \
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val = mfdcr(DCRN_ ## base ## _CONFIG_DATA); \
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spin_unlock_irqrestore(&dcr_ind_lock, flags); \
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val; \
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})
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#define mtdcri(base, reg, data) \
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do { \
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unsigned long flags; \
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spin_lock_irqsave(&dcr_ind_lock, flags); \
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mtdcr(DCRN_ ## base ## _CONFIG_ADDR, reg); \
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mtdcr(DCRN_ ## base ## _CONFIG_DATA, data); \
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spin_unlock_irqrestore(&dcr_ind_lock, flags); \
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} while (0)
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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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