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https://github.com/AsahiLinux/u-boot
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0be742d06d
Similar to what has been done before with c5437e5b for u-boot proper, we
enable the SMP bit for SPL as well. This is necessary when SDP booting
straight into Linux, i.e. falcon boot. When SDP boot mode is active, the
ROM code does not set this bit which makes the caches not work once
activated in Linux.
On an i.MX6ULL (528MHz), this reduces a minimal kernel's boot time into
an initramfs shell from ~6.1s down to ~1.2s.
Signed-off-by: Sven Schwermer <sven@svenschwermer.de>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
152 lines
3.9 KiB
C
152 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2015 Freescale Semiconductor, Inc.
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*/
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#include <common.h>
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#include <cpu_func.h>
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#include <asm/armv7.h>
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#include <asm/cache.h>
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#include <asm/pl310.h>
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#include <asm/io.h>
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#include <asm/mach-imx/sys_proto.h>
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void enable_ca7_smp(void)
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{
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u32 val;
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/* Read MIDR */
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asm volatile ("mrc p15, 0, %0, c0, c0, 0\n\t" : "=r"(val));
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val = (val >> 4);
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val &= 0xf;
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/* Only set the SMP for Cortex A7 */
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if (val == 0x7) {
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/* Read auxiliary control register */
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asm volatile ("mrc p15, 0, %0, c1, c0, 1\n\t" : "=r"(val));
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if (val & (1 << 6))
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return;
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/* Enable SMP */
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val |= (1 << 6);
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/* Write auxiliary control register */
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asm volatile ("mcr p15, 0, %0, c1, c0, 1\n\t" : : "r"(val));
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DSB;
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ISB;
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}
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}
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#if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF)
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void enable_caches(void)
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{
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#if defined(CONFIG_SYS_ARM_CACHE_WRITETHROUGH)
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enum dcache_option option = DCACHE_WRITETHROUGH;
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#else
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enum dcache_option option = DCACHE_WRITEBACK;
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#endif
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/* Avoid random hang when download by usb */
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invalidate_dcache_all();
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/* Set ACTLR.SMP bit for Cortex-A7 */
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enable_ca7_smp();
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/* Enable D-cache. I-cache is already enabled in start.S */
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dcache_enable();
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/* Enable caching on OCRAM and ROM */
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mmu_set_region_dcache_behaviour(ROMCP_ARB_BASE_ADDR,
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ROMCP_ARB_END_ADDR,
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option);
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mmu_set_region_dcache_behaviour(IRAM_BASE_ADDR,
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IRAM_SIZE,
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option);
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}
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#else
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void enable_caches(void)
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{
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/*
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* Set ACTLR.SMP bit for Cortex-A7, even if the caches are
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* disabled by u-boot
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*/
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enable_ca7_smp();
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puts("WARNING: Caches not enabled\n");
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}
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#endif
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#ifndef CONFIG_SYS_L2CACHE_OFF
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#ifdef CONFIG_SYS_L2_PL310
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#define IOMUXC_GPR11_L2CACHE_AS_OCRAM 0x00000002
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void v7_outer_cache_enable(void)
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{
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struct pl310_regs *const pl310 = (struct pl310_regs *)L2_PL310_BASE;
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struct iomuxc *iomux = (struct iomuxc *)IOMUXC_BASE_ADDR;
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unsigned int val, cache_id;
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/*
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* Must disable the L2 before changing the latency parameters
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* and auxiliary control register.
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*/
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clrbits_le32(&pl310->pl310_ctrl, L2X0_CTRL_EN);
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/*
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* Set bit 22 in the auxiliary control register. If this bit
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* is cleared, PL310 treats Normal Shared Non-cacheable
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* accesses as Cacheable no-allocate.
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*/
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setbits_le32(&pl310->pl310_aux_ctrl, L310_SHARED_ATT_OVERRIDE_ENABLE);
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if (is_mx6sl() || is_mx6sll()) {
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val = readl(&iomux->gpr[11]);
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if (val & IOMUXC_GPR11_L2CACHE_AS_OCRAM) {
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/* L2 cache configured as OCRAM, reset it */
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val &= ~IOMUXC_GPR11_L2CACHE_AS_OCRAM;
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writel(val, &iomux->gpr[11]);
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}
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}
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writel(0x132, &pl310->pl310_tag_latency_ctrl);
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writel(0x132, &pl310->pl310_data_latency_ctrl);
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val = readl(&pl310->pl310_prefetch_ctrl);
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/* Turn on the L2 I/D prefetch, double linefill */
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/* Set prefetch offset with any value except 23 as per errata 765569 */
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val |= 0x7000000f;
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/*
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* The L2 cache controller(PL310) version on the i.MX6D/Q is r3p1-50rel0
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* The L2 cache controller(PL310) version on the i.MX6DL/SOLO/SL/SX/DQP
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* is r3p2.
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* But according to ARM PL310 errata: 752271
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* ID: 752271: Double linefill feature can cause data corruption
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* Fault Status: Present in: r3p0, r3p1, r3p1-50rel0. Fixed in r3p2
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* Workaround: The only workaround to this erratum is to disable the
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* double linefill feature. This is the default behavior.
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*/
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cache_id = readl(&pl310->pl310_cache_id);
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if (((cache_id & L2X0_CACHE_ID_PART_MASK) == L2X0_CACHE_ID_PART_L310)
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&& ((cache_id & L2X0_CACHE_ID_RTL_MASK) < L2X0_CACHE_ID_RTL_R3P2))
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val &= ~(1 << 30);
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writel(val, &pl310->pl310_prefetch_ctrl);
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val = readl(&pl310->pl310_power_ctrl);
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val |= L2X0_DYNAMIC_CLK_GATING_EN;
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val |= L2X0_STNDBY_MODE_EN;
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writel(val, &pl310->pl310_power_ctrl);
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setbits_le32(&pl310->pl310_ctrl, L2X0_CTRL_EN);
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}
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void v7_outer_cache_disable(void)
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{
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struct pl310_regs *const pl310 = (struct pl310_regs *)L2_PL310_BASE;
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clrbits_le32(&pl310->pl310_ctrl, L2X0_CTRL_EN);
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}
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#endif /* !CONFIG_SYS_L2_PL310 */
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#endif /* !CONFIG_SYS_L2CACHE_OFF */
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