38350e0a00
A number of cleanups to get the SH-5 cache management code in line with the rest of the SH backend. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
71 lines
2.1 KiB
C
71 lines
2.1 KiB
C
/*
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* arch/sh/kernel/cpu/sh5/probe.c
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*
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* CPU Subtype Probing for SH-5.
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*
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* Copyright (C) 2000, 2001 Paolo Alberelli
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* Copyright (C) 2003 - 2007 Paul Mundt
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/string.h>
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#include <asm/processor.h>
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#include <asm/cache.h>
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int __init detect_cpu_and_cache_system(void)
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{
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unsigned long long cir;
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/*
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* Do peeks in real mode to avoid having to set up a mapping for
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* the WPC registers. On SH5-101 cut2, such a mapping would be
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* exposed to an address translation erratum which would make it
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* hard to set up correctly.
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*/
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cir = peek_real_address_q(0x0d000008);
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if ((cir & 0xffff) == 0x5103)
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boot_cpu_data.type = CPU_SH5_103;
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else if (((cir >> 32) & 0xffff) == 0x51e2)
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/* CPU.VCR aliased at CIR address on SH5-101 */
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boot_cpu_data.type = CPU_SH5_101;
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/*
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* First, setup some sane values for the I-cache.
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*/
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boot_cpu_data.icache.ways = 4;
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boot_cpu_data.icache.sets = 256;
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boot_cpu_data.icache.linesz = L1_CACHE_BYTES;
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boot_cpu_data.icache.way_incr = (1 << 13);
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boot_cpu_data.icache.entry_shift = 5;
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boot_cpu_data.icache.way_size = boot_cpu_data.icache.sets *
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boot_cpu_data.icache.linesz;
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boot_cpu_data.icache.entry_mask = 0x1fe0;
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boot_cpu_data.icache.flags = 0;
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/*
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* Next, setup some sane values for the D-cache.
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*
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* On the SH5, these are pretty consistent with the I-cache settings,
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* so we just copy over the existing definitions.. these can be fixed
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* up later, especially if we add runtime CPU probing.
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*
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* Though in the meantime it saves us from having to duplicate all of
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* the above definitions..
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*/
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boot_cpu_data.dcache = boot_cpu_data.icache;
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/*
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* Setup any cache-related flags here
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*/
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#if defined(CONFIG_CACHE_WRITETHROUGH)
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set_bit(SH_CACHE_MODE_WT, &(boot_cpu_data.dcache.flags));
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#elif defined(CONFIG_CACHE_WRITEBACK)
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set_bit(SH_CACHE_MODE_WB, &(boot_cpu_data.dcache.flags));
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#endif
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return 0;
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}
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