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83f34df4e7
Now that all users of dcr_read()/dcr_write() add the dcr_host_t.base, we can save them the trouble and do it in dcr_read()/dcr_write(). As some background to why we just went through all this jiggery-pokery, benh sayeth: Initially the goal of the dcr_read/dcr_write routines was to operate like mfdcr/mtdcr which take absolute DCR numbers. The reason is that on 4xx hardware, indirect DCR access is a pain (goes through a table of instructions) and it's useful to have the compiler resolve an absolute DCR inline. We decided that wasn't worth the API bastardisation since most places where absolute DCR values are used are low level 4xx-only code which may as well continue using mfdcr/mtdcr, while the new API is designed for device "instances" that can exist on 4xx and Axon type platforms and may be located at variable DCR offsets. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Jeff Garzik <jeff@garzik.org>
56 lines
1.7 KiB
C
56 lines
1.7 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_MMIO_H
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#define _ASM_POWERPC_DCR_MMIO_H
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#ifdef __KERNEL__
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#include <asm/io.h>
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typedef struct {
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void __iomem *token;
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unsigned int stride;
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unsigned int base;
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} dcr_host_t;
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#define DCR_MAP_OK(host) ((host).token != NULL)
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extern dcr_host_t dcr_map(struct device_node *dev, unsigned int dcr_n,
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unsigned int dcr_c);
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extern void dcr_unmap(dcr_host_t host, unsigned int dcr_n, unsigned int dcr_c);
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static inline u32 dcr_read(dcr_host_t host, unsigned int dcr_n)
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{
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return in_be32(host.token + ((host.base + dcr_n) * host.stride));
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}
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static inline void dcr_write(dcr_host_t host, unsigned int dcr_n, u32 value)
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{
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out_be32(host.token + ((host.base + dcr_n) * host.stride), value);
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}
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extern u64 of_translate_dcr_address(struct device_node *dev,
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unsigned int dcr_n,
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unsigned int *stride);
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_DCR_MMIO_H */
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