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Previously, DCR support was configured at compile time to either use MMIO or native dcr instructions. Although this works for most platforms, it fails on FPGA platforms: 1) Systems may include more than one DCR bus. 2) Systems may be native DCR capable and still use memory mapped DCR interface. This patch provides runtime support based on the device trees for the case where CONFIG_PPC_DCR_MMIO and CONFIG_PPC_DCR_NATIVE are both selected. Previously, this was a poorly defined configuration, which happened to provide NATIVE support. The runtime selection is made based on the dcr-controller having a 'dcr-access-method' attribute in the device tree. If only one of the above options is selected, then the code uses #defines to select only the used code in order to avoid introducing overhead in existing usage. Signed-off-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com> Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
62 lines
1.8 KiB
C
62 lines
1.8 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_mmio_t;
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static inline bool dcr_map_ok_mmio(dcr_host_mmio_t host)
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{
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return host.token != NULL;
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}
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extern dcr_host_mmio_t dcr_map_mmio(struct device_node *dev,
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unsigned int dcr_n,
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unsigned int dcr_c);
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extern void dcr_unmap_mmio(dcr_host_mmio_t host, unsigned int dcr_c);
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static inline u32 dcr_read_mmio(dcr_host_mmio_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_mmio(dcr_host_mmio_t host,
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unsigned int dcr_n,
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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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