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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2020 SiFive, Inc
*
* Authors:
* Pragnesh Patel <pragnesh.patel@sifive.com>
*/
#include <common.h>
#include <asm/global_data.h>
#include <asm/io.h>
#include <asm/types.h>
#include <linux/bitops.h>
/* Register offsets */
#define L2_CACHE_CONFIG 0x000
#define L2_CACHE_ENABLE 0x008
#define MASK_NUM_WAYS GENMASK(15, 8)
#define NUM_WAYS_SHIFT 8
DECLARE_GLOBAL_DATA_PTR;
int cache_enable_ways(void)
{
const void *blob = gd->fdt_blob;
int node;
fdt_addr_t base;
u32 config;
u32 ways;
volatile u32 *enable;
node = fdt_node_offset_by_compatible(blob, -1,
"sifive,fu540-c000-ccache");
if (node < 0)
return node;
base = fdtdec_get_addr(blob, node, "reg");
if (base == FDT_ADDR_T_NONE)
return FDT_ADDR_T_NONE;
config = readl((volatile u32 *)base + L2_CACHE_CONFIG);
ways = (config & MASK_NUM_WAYS) >> NUM_WAYS_SHIFT;
enable = (volatile u32 *)(base + L2_CACHE_ENABLE);
/* memory barrier */
mb();
(*enable) = ways - 1;
/* memory barrier */
mb();
return 0;
}
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