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| author |   Greentime Hu <greentime@andestech.com> | 2017-10-25 14:34:56 +0800 |
|---|---|---|
| committer | Greentime Hu <greentime@andestech.com> | 2018-02-22 10:44:34 +0800 |
| commit | 3af6e29254cb5edf7cb1982081fce05797541633 (patch) | |
| tree | 4a9742db4c773985c645bad9546d43889563c405 /arch/nds32/kernel | |
| parent | nds32: Debugging support (diff) | |
| download | linux-dev-3af6e29254cb5edf7cb1982081fce05797541633.tar.xz linux-dev-3af6e29254cb5edf7cb1982081fce05797541633.zip | |
nds32: L2 cache support
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>
Diffstat (limited to 'arch/nds32/kernel')
| -rw-r--r-- | arch/nds32/kernel/atl2c.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/arch/nds32/kernel/atl2c.c b/arch/nds32/kernel/atl2c.c new file mode 100644 index 000000000000..0c6d031a1c4a --- /dev/null +++ b/arch/nds32/kernel/atl2c.c @@ -0,0 +1,64 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2005-2017 Andes Technology Corporation + +#include <linux/compiler.h> +#include <linux/of_address.h> +#include <linux/of_fdt.h> +#include <linux/of_platform.h> +#include <asm/l2_cache.h> + +void __iomem *atl2c_base; +static const struct of_device_id atl2c_ids[] __initconst = { + {.compatible = "andestech,atl2c",} +}; + +static int __init atl2c_of_init(void) +{ + struct device_node *np; + struct resource res; + unsigned long tmp = 0; + unsigned long l2set, l2way, l2clsz; + + if (!(__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskL2C)) + return -ENODEV; + + np = of_find_matching_node(NULL, atl2c_ids); + if (!np) + return -ENODEV; + + if (of_address_to_resource(np, 0, &res)) + return -ENODEV; + + atl2c_base = ioremap(res.start, resource_size(&res)); + if (!atl2c_base) + return -ENOMEM; + + l2set = + 64 << ((L2C_R_REG(L2_CA_CONF_OFF) & L2_CA_CONF_mskL2SET) >> + L2_CA_CONF_offL2SET); + l2way = + 1 + + ((L2C_R_REG(L2_CA_CONF_OFF) & L2_CA_CONF_mskL2WAY) >> + L2_CA_CONF_offL2WAY); + l2clsz = + 4 << ((L2C_R_REG(L2_CA_CONF_OFF) & L2_CA_CONF_mskL2CLSZ) >> + L2_CA_CONF_offL2CLSZ); + pr_info("L2:%luKB/%luS/%luW/%luB\n", + l2set * l2way * l2clsz / 1024, l2set, l2way, l2clsz); + + tmp = L2C_R_REG(L2CC_PROT_OFF); + tmp &= ~L2CC_PROT_mskMRWEN; + L2C_W_REG(L2CC_PROT_OFF, tmp); + + tmp = L2C_R_REG(L2CC_SETUP_OFF); + tmp &= ~L2CC_SETUP_mskPART; + L2C_W_REG(L2CC_SETUP_OFF, tmp); + + tmp = L2C_R_REG(L2CC_CTRL_OFF); + tmp |= L2CC_CTRL_mskEN; + L2C_W_REG(L2CC_CTRL_OFF, tmp); + + return 0; +} + +subsys_initcall(atl2c_of_init); |