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Commit 3af6e292 authored by Greentime Hu's avatar Greentime Hu
Browse files

nds32: L2 cache support 



This patch adds L2 cache support.

Signed-off-by: default avatarVincent Chen <vincentc@andestech.com>
Signed-off-by: default avatarGreentime Hu <greentime@andestech.com>
Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
parent e9d0704a

arch/nds32/include/asm/l2_cache.h

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// SPDX-License-Identifier: GPL-2.0

// Copyright (C) 2005-2017 Andes Technology Corporation



#ifndef L2_CACHE_H

#define L2_CACHE_H



/* CCTL_CMD_OP */

#define L2_CA_CONF_OFF		0x0

#define L2_IF_CONF_OFF		0x4

#define L2CC_SETUP_OFF		0x8

#define L2CC_PROT_OFF		0xC

#define L2CC_CTRL_OFF		0x10

#define L2_INT_EN_OFF           0x20

#define L2_STA_OFF              0x24

#define RDERR_ADDR_OFF		0x28

#define WRERR_ADDR_OFF		0x2c

#define EVDPTERR_ADDR_OFF	0x30

#define IMPL3ERR_ADDR_OFF	0x34

#define L2_CNT0_CTRL_OFF        0x40

#define L2_EVNT_CNT0_OFF        0x44

#define L2_CNT1_CTRL_OFF        0x48

#define L2_EVNT_CNT1_OFF        0x4c

#define L2_CCTL_CMD_OFF		0x60

#define L2_CCTL_STATUS_OFF	0x64

#define L2_LINE_TAG_OFF		0x68

#define L2_LINE_DPT_OFF		0x70



#define CCTL_CMD_L2_IX_INVAL    0x0

#define CCTL_CMD_L2_PA_INVAL    0x1

#define CCTL_CMD_L2_IX_WB       0x2

#define CCTL_CMD_L2_PA_WB       0x3

#define CCTL_CMD_L2_PA_WBINVAL  0x5

#define CCTL_CMD_L2_SYNC        0xa



/* CCTL_CMD_TYPE */

#define CCTL_SINGLE_CMD         0

#define CCTL_BLOCK_CMD          0x10

#define CCTL_ALL_CMD		0x10



/******************************************************************************

 * L2_CA_CONF (Cache architecture configuration)

 *****************************************************************************/

#define L2_CA_CONF_offL2SET		0

#define L2_CA_CONF_offL2WAY		4

#define L2_CA_CONF_offL2CLSZ            8

#define L2_CA_CONF_offL2DW		11

#define L2_CA_CONF_offL2PT		14

#define L2_CA_CONF_offL2VER		16



#define L2_CA_CONF_mskL2SET	(0xFUL << L2_CA_CONF_offL2SET)

#define L2_CA_CONF_mskL2WAY	(0xFUL << L2_CA_CONF_offL2WAY)

#define L2_CA_CONF_mskL2CLSZ    (0x7UL << L2_CA_CONF_offL2CLSZ)

#define L2_CA_CONF_mskL2DW	(0x7UL << L2_CA_CONF_offL2DW)

#define L2_CA_CONF_mskL2PT	(0x3UL << L2_CA_CONF_offL2PT)

#define L2_CA_CONF_mskL2VER	(0xFFFFUL << L2_CA_CONF_offL2VER)



/******************************************************************************

 * L2CC_SETUP (L2CC Setup register)

 *****************************************************************************/

#define L2CC_SETUP_offPART              0

#define L2CC_SETUP_mskPART              (0x3UL << L2CC_SETUP_offPART)

#define L2CC_SETUP_offDDLATC            4

#define L2CC_SETUP_mskDDLATC            (0x3UL << L2CC_SETUP_offDDLATC)

#define L2CC_SETUP_offTDLATC            8

#define L2CC_SETUP_mskTDLATC            (0x3UL << L2CC_SETUP_offTDLATC)



/******************************************************************************

 * L2CC_PROT (L2CC Protect register)

 *****************************************************************************/

#define L2CC_PROT_offMRWEN              31

#define L2CC_PROT_mskMRWEN      (0x1UL << L2CC_PROT_offMRWEN)



/******************************************************************************

 * L2_CCTL_STATUS_Mn (The L2CCTL command working status for Master n)

 *****************************************************************************/

#define L2CC_CTRL_offEN                 31

#define L2CC_CTRL_mskEN                 (0x1UL << L2CC_CTRL_offEN)



/******************************************************************************

 * L2_CCTL_STATUS_Mn (The L2CCTL command working status for Master n)

 *****************************************************************************/

#define L2_CCTL_STATUS_offCMD_COMP      31

#define L2_CCTL_STATUS_mskCMD_COMP      (0x1 << L2_CCTL_STATUS_offCMD_COMP)



extern void __iomem *atl2c_base;

#include <linux/smp.h>

#include <asm/io.h>

#include <asm/bitfield.h>



#define L2C_R_REG(offset)               readl(atl2c_base + offset)

#define L2C_W_REG(offset, value)        writel(value, atl2c_base + offset)



#define L2_CMD_RDY()    \

        do{;}while((L2C_R_REG(L2_CCTL_STATUS_OFF) & L2_CCTL_STATUS_mskCMD_COMP) == 0)



static inline unsigned long L2_CACHE_SET(void)

{

	return 64 << ((L2C_R_REG(L2_CA_CONF_OFF) & L2_CA_CONF_mskL2SET) >>

		      L2_CA_CONF_offL2SET);

}



static inline unsigned long L2_CACHE_WAY(void)

{

	return 1 +

	    ((L2C_R_REG(L2_CA_CONF_OFF) & L2_CA_CONF_mskL2WAY) >>

	     L2_CA_CONF_offL2WAY);

}



static inline unsigned long L2_CACHE_LINE_SIZE(void)

{



	return 4 << ((L2C_R_REG(L2_CA_CONF_OFF) & L2_CA_CONF_mskL2CLSZ) >>

		     L2_CA_CONF_offL2CLSZ);

}



static inline unsigned long GET_L2CC_CTRL_CPU(unsigned long cpu)

{

	if (cpu == smp_processor_id())

		return L2C_R_REG(L2CC_CTRL_OFF);

	return L2C_R_REG(L2CC_CTRL_OFF + (cpu << 8));

}



static inline void SET_L2CC_CTRL_CPU(unsigned long cpu, unsigned long val)

{

	if (cpu == smp_processor_id())

		L2C_W_REG(L2CC_CTRL_OFF, val);

	else

		L2C_W_REG(L2CC_CTRL_OFF + (cpu << 8), val);

}



static inline unsigned long GET_L2CC_STATUS_CPU(unsigned long cpu)

{

	if (cpu == smp_processor_id())

		return L2C_R_REG(L2_CCTL_STATUS_OFF);

	return L2C_R_REG(L2_CCTL_STATUS_OFF + (cpu << 8));

}

#endif

arch/nds32/kernel/atl2c.c

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// 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);