arm: imx: common rework cache settings for imx6

Rework cache settings for imx6, move cache configuration
to imx-common/cache.c so it can be reused for newer SoC

Signed-off-by: Adrian Alonso <aalonso@freescale.com>

1 files changed, 103 insertions, 0 deletions

diff --git a/arch/arm/imx-common/cache.c b/arch/arm/imx-common/cache.c
new file mode 100644
index 0000000000..54b021cfed
--- /dev/null
+++ b/arch/arm/imx-common/cache.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright 2015 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/armv7.h>
+#include <asm/pl310.h>
+#include <asm/io.h>
+
+#ifndef CONFIG_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();
+
+	/* 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);
+}
+#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;
+	unsigned int val;
+
+
+	/*
+	 * 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 defined CONFIG_MX6SL
+	struct iomuxc *iomux = (struct iomuxc *)IOMUXC_BASE_ADDR;
+	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]);
+	}
+#endif
+
+	/* Must disable the L2 before changing the latency parameters */
+	clrbits_le32(&pl310->pl310_ctrl, L2X0_CTRL_EN);
+
+	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 */
+	val |= 0x30000000;
+
+	/*
+	 * 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 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.
+	 */
+
+#ifndef CONFIG_MX6Q
+	val |= 0x40800000;
+#endif
+	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 */