72 lines
1.8 KiB
C
72 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* arch/sh/kernel/cpu/sh2/probe.c
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*
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* CPU Subtype Probing for SH-2.
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*
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* Copyright (C) 2002 Paul Mundt
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*/
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#include <linux/init.h>
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#include <linux/of_fdt.h>
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#include <linux/smp.h>
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#include <linux/io.h>
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#include <asm/processor.h>
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#include <asm/cache.h>
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#if defined(CONFIG_CPU_J2)
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extern u32 __iomem *j2_ccr_base;
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static int __init scan_cache(unsigned long node, const char *uname,
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int depth, void *data)
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{
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if (!of_flat_dt_is_compatible(node, "jcore,cache"))
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return 0;
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j2_ccr_base = (u32 __iomem *)of_flat_dt_translate_address(node);
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return 1;
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}
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#endif
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void __ref cpu_probe(void)
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{
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#if defined(CONFIG_CPU_SUBTYPE_SH7619)
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boot_cpu_data.type = CPU_SH7619;
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boot_cpu_data.dcache.ways = 4;
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boot_cpu_data.dcache.way_incr = (1<<12);
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boot_cpu_data.dcache.sets = 256;
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boot_cpu_data.dcache.entry_shift = 4;
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boot_cpu_data.dcache.linesz = L1_CACHE_BYTES;
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boot_cpu_data.dcache.flags = 0;
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#endif
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#if defined(CONFIG_CPU_J2)
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#if defined(CONFIG_SMP)
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unsigned cpu = hard_smp_processor_id();
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#else
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unsigned cpu = 0;
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#endif
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if (cpu == 0) of_scan_flat_dt(scan_cache, NULL);
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if (j2_ccr_base) __raw_writel(0x80000303, j2_ccr_base + 4*cpu);
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if (cpu != 0) return;
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boot_cpu_data.type = CPU_J2;
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/* These defaults are appropriate for the original/current
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* J2 cache. Once there is a proper framework for getting cache
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* info from device tree, we should switch to that. */
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boot_cpu_data.dcache.ways = 1;
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boot_cpu_data.dcache.sets = 256;
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boot_cpu_data.dcache.entry_shift = 5;
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boot_cpu_data.dcache.linesz = 32;
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boot_cpu_data.dcache.flags = 0;
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boot_cpu_data.flags |= CPU_HAS_CAS_L;
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#else
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/*
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* SH-2 doesn't have separate caches
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*/
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boot_cpu_data.dcache.flags |= SH_CACHE_COMBINED;
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#endif
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boot_cpu_data.icache = boot_cpu_data.dcache;
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boot_cpu_data.family = CPU_FAMILY_SH2;
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}
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