Add a PL310 cache controller driver that is usually found on
ARMv7(32-bit) devices. The driver configures the cache settings that can
be found in the device tree files.
This initial revision only configures basic settings(data & instruction
prefetch, shared-override, data & tag latency). I believe these are the
settings that affect performance the most. Comprehensive settings can be
done by the OS.
Reviewed-by: Simon Glass
Signed-off-by: Dinh Nguyen
---
v4: no change
v3: Add Reviewed-by and fix nits
v2: split out patch and address comments from Simon Glass
---
drivers/cache/Kconfig | 9 +
drivers/cache/Makefile | 1 +
drivers/cache/cache-l2x0.c | 76 ++
3 files changed, 86 insertions(+)
create mode 100644 drivers/cache/cache-l2x0.c
diff --git a/drivers/cache/Kconfig b/drivers/cache/Kconfig
index 8b7c9c7f9f..24def7ac0f 100644
--- a/drivers/cache/Kconfig
+++ b/drivers/cache/Kconfig
@@ -13,4 +13,13 @@ config CACHE
is usually located on the same chip. This uclass can be used for
configuring settings that be found from a device tree file.
+config L2X0_CACHE
+ tristate "PL310 cache driver"
+ select CACHE
+ depends on ARM
+ help
+ This driver is for the PL310 cache controller commonly found on
+ ARMv7(32-bit) devices. The driver configures the cache settings
+ found in the device tree.
+
endmenu
diff --git a/drivers/cache/Makefile b/drivers/cache/Makefile
index 2ba68060c1..9deb961d91 100644
--- a/drivers/cache/Makefile
+++ b/drivers/cache/Makefile
@@ -1,3 +1,4 @@
obj-$(CONFIG_CACHE) += cache-uclass.o
obj-$(CONFIG_SANDBOX) += sandbox_cache.o
+obj-$(CONFIG_L2X0_CACHE) += cache-l2x0.o
diff --git a/drivers/cache/cache-l2x0.c b/drivers/cache/cache-l2x0.c
new file mode 100644
index 00..67c752d076
--- /dev/null
+++ b/drivers/cache/cache-l2x0.c
@@ -0,0 +1,76 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2019 Intel Corporation
+ */
+#include
+#include
+#include
+
+#include
+#include
+
+static void l2c310_of_parse_and_init(struct udevice *dev)
+{
+ u32 tag[3] = { 0, 0, 0 };
+ u32 saved_reg, prefetch;
+ struct pl310_regs *regs = (struct pl310_regs *)dev_read_addr(dev);
+
+ /* Disable the L2 Cache */
+ clrbits_le32(>pl310_ctrl, L2X0_CTRL_EN);
+
+ saved_reg = readl(>pl310_aux_ctrl);
+ if (!dev_read_u32(dev, "prefetch-data", )) {
+ if (prefetch)
+ saved_reg |= L310_AUX_CTRL_DATA_PREFETCH_MASK;
+ else
+ saved_reg &= ~L310_AUX_CTRL_DATA_PREFETCH_MASK;
+ }
+
+ if (!dev_read_u32(dev, "prefetch-instr", )) {
+ if (prefetch)
+ saved_reg |= L310_AUX_CTRL_INST_PREFETCH_MASK;
+ else
+ saved_reg &= ~L310_AUX_CTRL_INST_PREFETCH_MASK;
+ }
+
+ saved_reg |= dev_read_bool(dev, "arm,shared-override");
+ writel(saved_reg, >pl310_aux_ctrl);
+
+ saved_reg = readl(>pl310_tag_latency_ctrl);
+ if (!dev_read_u32_array(dev, "arm,tag-latency", tag, 3))
+ saved_reg |= L310_LATENCY_CTRL_RD(tag[0] - 1) |
+L310_LATENCY_CTRL_WR(tag[1] - 1) |
+L310_LATENCY_CTRL_SETUP(tag[2] - 1);
+ writel(saved_reg, >pl310_tag_latency_ctrl);
+
+ saved_reg = readl(>pl310_data_latency_ctrl);
+ if (!dev_read_u32_array(dev, "arm,data-latency", tag, 3))
+ saved_reg |= L310_LATENCY_CTRL_RD(tag[0] - 1) |
+L310_LATENCY_CTRL_WR(tag[1] - 1) |
+L310_LATENCY_CTRL_SETUP(tag[2] - 1);
+ writel(saved_reg, >pl310_data_latency_ctrl);
+
+ /* Enable the L2 cache */
+ setbits_le32(>pl310_ctrl, L2X0_CTRL_EN);
+}
+
+static int l2x0_probe(struct udevice *dev)
+{
+ l2c310_of_parse_and_init(dev);
+
+ return 0;
+}
+
+
+static const struct udevice_id l2x0_ids[] = {
+ { .compatible = "arm,pl310-cache" },
+ {}
+};
+
+U_BOOT_DRIVER(pl310_cache) = {
+ .name = "pl310_cache",
+ .id = UCLASS_CACHE,
+ .of_match = l2x0_ids,
+ .probe = l2x0_probe,
+ .flags = DM_FLAG_PRE_RELOC,
+};
--
2.20.0
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