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The Memory Protection Unit(MPU) allows to partition memory into regions and set individual protection attributes for each region. In absence of MPU a default map[1] will take effect. Add support for configuring MPU on Cortex-R, by reusing the existing support for Cortex-M processor. [1] http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0460d/I1002400.html Tested-by: Michal Simek <michal.simek@xilinx.com> Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com> Reviewed-by: Tom Rini <trini@konsulko.com>
45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2017, STMicroelectronics - All Rights Reserved
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* Author(s): Vikas Manocha, <vikas.manocha@st.com> for STMicroelectronics.
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*/
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#include <linux/bitops.h>
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#include <asm/armv7m.h>
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#include <asm/armv7_mpu.h>
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#include <asm/io.h>
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#define V7M_MPU_CTRL_ENABLE BIT(0)
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#define V7M_MPU_CTRL_DISABLE (0 << 0)
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#define V7M_MPU_CTRL_HFNMIENA BIT(1)
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#define V7M_MPU_CTRL_PRIVDEFENA BIT(2)
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#define VALID_REGION BIT(4)
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void disable_mpu(void)
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{
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writel(0, &V7M_MPU->ctrl);
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}
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void enable_mpu(void)
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{
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writel(V7M_MPU_CTRL_ENABLE | V7M_MPU_CTRL_PRIVDEFENA, &V7M_MPU->ctrl);
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/* Make sure new mpu config is effective for next memory access */
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dsb();
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isb(); /* Make sure instruction stream sees it */
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}
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void mpu_config(struct mpu_region_config *reg_config)
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{
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uint32_t attr;
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attr = get_attr_encoding(reg_config->mr_attr);
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writel(reg_config->start_addr | VALID_REGION | reg_config->region_no,
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&V7M_MPU->rbar);
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writel(reg_config->xn << XN_SHIFT | reg_config->ap << AP_SHIFT | attr
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| reg_config->reg_size << REGION_SIZE_SHIFT | ENABLE_REGION
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, &V7M_MPU->rasr);
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}
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