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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2015 Freescale Semiconductor, Inc.
*/
#include <common.h>
#include <cpu_func.h>
#include <asm/armv7.h>
#include <asm/cache.h>
#include <asm/pl310.h>
#include <asm/io.h>
#include <asm/mach-imx/sys_proto.h>
static void enable_ca7_smp(void)
{
u32 val;
/* Read MIDR */
asm volatile ("mrc p15, 0, %0, c0, c0, 0\n\t" : "=r"(val));
val = (val >> 4);
val &= 0xf;
/* Only set the SMP for Cortex A7 */
if (val == 0x7) {
/* Read auxiliary control register */
asm volatile ("mrc p15, 0, %0, c1, c0, 1\n\t" : "=r"(val));
if (val & (1 << 6))
return;
/* Enable SMP */
val |= (1 << 6);
/* Write auxiliary control register */
asm volatile ("mcr p15, 0, %0, c1, c0, 1\n\t" : : "r"(val));
DSB;
ISB;
}
}
#if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF)
void enable_caches(void)
{
#if defined(CONFIG_SYS_ARM_CACHE_WRITETHROUGH)
enum dcache_option option = DCACHE_WRITETHROUGH;
#else
enum dcache_option option = DCACHE_WRITEBACK;
#endif
/* Avoid random hang when download by usb */
invalidate_dcache_all();
/* Set ACTLR.SMP bit for Cortex-A7 */
enable_ca7_smp();
/* Enable D-cache. I-cache is already enabled in start.S */
dcache_enable();
/* Enable caching on OCRAM and ROM */
mmu_set_region_dcache_behaviour(ROMCP_ARB_BASE_ADDR,
ROMCP_ARB_END_ADDR,
option);
mmu_set_region_dcache_behaviour(IRAM_BASE_ADDR,
IRAM_SIZE,
option);
}
#else
void enable_caches(void)
{
/*
* Set ACTLR.SMP bit for Cortex-A7, even if the caches are
* disabled by u-boot
*/
enable_ca7_smp();
puts("WARNING: Caches not enabled\n");
}
#endif
#ifndef CONFIG_SYS_L2CACHE_OFF
#ifdef CONFIG_SYS_L2_PL310
#define IOMUXC_GPR11_L2CACHE_AS_OCRAM 0x00000002
void v7_outer_cache_enable(void)
{
struct pl310_regs *const pl310 = (struct pl310_regs *)L2_PL310_BASE;
struct iomuxc *iomux = (struct iomuxc *)IOMUXC_BASE_ADDR;
unsigned int val, cache_id;
/*
* Must disable the L2 before changing the latency parameters
* and auxiliary control register.
*/
clrbits_le32(&pl310->pl310_ctrl, L2X0_CTRL_EN);
/*
* Set bit 22 in the auxiliary control register. If this bit
* is cleared, PL310 treats Normal Shared Non-cacheable
* accesses as Cacheable no-allocate.
*/
setbits_le32(&pl310->pl310_aux_ctrl, L310_SHARED_ATT_OVERRIDE_ENABLE);
if (is_mx6sl() || is_mx6sll()) {
val = readl(&iomux->gpr[11]);
if (val & IOMUXC_GPR11_L2CACHE_AS_OCRAM) {
/* L2 cache configured as OCRAM, reset it */
val &= ~IOMUXC_GPR11_L2CACHE_AS_OCRAM;
writel(val, &iomux->gpr[11]);
}
}
writel(0x132, &pl310->pl310_tag_latency_ctrl);
writel(0x132, &pl310->pl310_data_latency_ctrl);
val = readl(&pl310->pl310_prefetch_ctrl);
/* Turn on the L2 I/D prefetch, double linefill */
/* Set prefetch offset with any value except 23 as per errata 765569 */
val |= 0x7000000f;
/*
* The L2 cache controller(PL310) version on the i.MX6D/Q is r3p1-50rel0
* The L2 cache controller(PL310) version on the i.MX6DL/SOLO/SL/SX/DQP
* is r3p2.
* But according to ARM PL310 errata: 752271
* ID: 752271: Double linefill feature can cause data corruption
* Fault Status: Present in: r3p0, r3p1, r3p1-50rel0. Fixed in r3p2
* Workaround: The only workaround to this erratum is to disable the
* double linefill feature. This is the default behavior.
*/
cache_id = readl(&pl310->pl310_cache_id);
if (((cache_id & L2X0_CACHE_ID_PART_MASK) == L2X0_CACHE_ID_PART_L310)
&& ((cache_id & L2X0_CACHE_ID_RTL_MASK) < L2X0_CACHE_ID_RTL_R3P2))
val &= ~(1 << 30);
writel(val, &pl310->pl310_prefetch_ctrl);
val = readl(&pl310->pl310_power_ctrl);
val |= L2X0_DYNAMIC_CLK_GATING_EN;
val |= L2X0_STNDBY_MODE_EN;
writel(val, &pl310->pl310_power_ctrl);
setbits_le32(&pl310->pl310_ctrl, L2X0_CTRL_EN);
}
void v7_outer_cache_disable(void)
{
struct pl310_regs *const pl310 = (struct pl310_regs *)L2_PL310_BASE;
clrbits_le32(&pl310->pl310_ctrl, L2X0_CTRL_EN);
}
#endif /* !CONFIG_SYS_L2_PL310 */
#endif /* !CONFIG_SYS_L2CACHE_OFF */
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