b786af117b
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>
83 lines
2.8 KiB
C
83 lines
2.8 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_H
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#define _ASM_POWERPC_DCR_H
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#ifdef __KERNEL__
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#ifndef __ASSEMBLY__
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#ifdef CONFIG_PPC_DCR
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#ifdef CONFIG_PPC_DCR_NATIVE
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#include <asm/dcr-native.h>
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#endif
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#ifdef CONFIG_PPC_DCR_MMIO
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#include <asm/dcr-mmio.h>
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#endif
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/* Indirection layer for providing both NATIVE and MMIO support. */
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#if defined(CONFIG_PPC_DCR_NATIVE) && defined(CONFIG_PPC_DCR_MMIO)
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#include <asm/dcr-generic.h>
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#define DCR_MAP_OK(host) dcr_map_ok_generic(host)
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#define dcr_map(dev, dcr_n, dcr_c) dcr_map_generic(dev, dcr_n, dcr_c)
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#define dcr_unmap(host, dcr_c) dcr_unmap_generic(host, dcr_c)
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#define dcr_read(host, dcr_n) dcr_read_generic(host, dcr_n)
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#define dcr_write(host, dcr_n, value) dcr_write_generic(host, dcr_n, value)
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#else
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#ifdef CONFIG_PPC_DCR_NATIVE
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typedef dcr_host_native_t dcr_host_t;
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#define DCR_MAP_OK(host) dcr_map_ok_native(host)
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#define dcr_map(dev, dcr_n, dcr_c) dcr_map_native(dev, dcr_n, dcr_c)
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#define dcr_unmap(host, dcr_c) dcr_unmap_native(host, dcr_c)
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#define dcr_read(host, dcr_n) dcr_read_native(host, dcr_n)
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#define dcr_write(host, dcr_n, value) dcr_write_native(host, dcr_n, value)
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#else
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typedef dcr_host_mmio_t dcr_host_t;
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#define DCR_MAP_OK(host) dcr_map_ok_mmio(host)
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#define dcr_map(dev, dcr_n, dcr_c) dcr_map_mmio(dev, dcr_n, dcr_c)
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#define dcr_unmap(host, dcr_c) dcr_unmap_mmio(host, dcr_c)
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#define dcr_read(host, dcr_n) dcr_read_mmio(host, dcr_n)
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#define dcr_write(host, dcr_n, value) dcr_write_mmio(host, dcr_n, value)
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#endif
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#endif /* defined(CONFIG_PPC_DCR_NATIVE) && defined(CONFIG_PPC_DCR_MMIO) */
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/*
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* On CONFIG_PPC_MERGE, we have additional helpers to read the DCR
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* base from the device-tree
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*/
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#ifdef CONFIG_PPC_MERGE
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struct device_node;
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extern unsigned int dcr_resource_start(struct device_node *np,
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unsigned int index);
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extern unsigned int dcr_resource_len(struct device_node *np,
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unsigned int index);
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#endif /* CONFIG_PPC_MERGE */
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#endif /* CONFIG_PPC_DCR */
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#endif /* __ASSEMBLY__ */
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_DCR_H */
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