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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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3af6e29254
This patch adds L2 cache support. Signed-off-by: Vincent Chen <vincentc@andestech.com> Signed-off-by: Greentime Hu <greentime@andestech.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2005-2017 Andes Technology Corporation
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#include <linux/compiler.h>
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#include <linux/of_address.h>
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#include <linux/of_fdt.h>
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#include <linux/of_platform.h>
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#include <asm/l2_cache.h>
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void __iomem *atl2c_base;
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static const struct of_device_id atl2c_ids[] __initconst = {
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{.compatible = "andestech,atl2c",}
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};
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static int __init atl2c_of_init(void)
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{
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struct device_node *np;
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struct resource res;
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unsigned long tmp = 0;
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unsigned long l2set, l2way, l2clsz;
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if (!(__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskL2C))
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return -ENODEV;
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np = of_find_matching_node(NULL, atl2c_ids);
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if (!np)
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return -ENODEV;
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if (of_address_to_resource(np, 0, &res))
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return -ENODEV;
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atl2c_base = ioremap(res.start, resource_size(&res));
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if (!atl2c_base)
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return -ENOMEM;
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l2set =
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64 << ((L2C_R_REG(L2_CA_CONF_OFF) & L2_CA_CONF_mskL2SET) >>
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L2_CA_CONF_offL2SET);
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l2way =
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1 +
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((L2C_R_REG(L2_CA_CONF_OFF) & L2_CA_CONF_mskL2WAY) >>
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L2_CA_CONF_offL2WAY);
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l2clsz =
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4 << ((L2C_R_REG(L2_CA_CONF_OFF) & L2_CA_CONF_mskL2CLSZ) >>
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L2_CA_CONF_offL2CLSZ);
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pr_info("L2:%luKB/%luS/%luW/%luB\n",
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l2set * l2way * l2clsz / 1024, l2set, l2way, l2clsz);
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tmp = L2C_R_REG(L2CC_PROT_OFF);
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tmp &= ~L2CC_PROT_mskMRWEN;
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L2C_W_REG(L2CC_PROT_OFF, tmp);
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tmp = L2C_R_REG(L2CC_SETUP_OFF);
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tmp &= ~L2CC_SETUP_mskPART;
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L2C_W_REG(L2CC_SETUP_OFF, tmp);
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tmp = L2C_R_REG(L2CC_CTRL_OFF);
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tmp |= L2CC_CTRL_mskEN;
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L2C_W_REG(L2CC_CTRL_OFF, tmp);
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return 0;
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}
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subsys_initcall(atl2c_of_init);
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