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.
Signed-off-by: Dinh Nguyen dinguyen@kernel.org --- v2: split out patch and address comments from Simon Glass --- drivers/cache/Kconfig | 9 +++++ drivers/cache/Makefile | 1 + drivers/cache/cache-l2x0.c | 75 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 85 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 0000000000..a23a66c4a8 --- /dev/null +++ b/drivers/cache/cache-l2x0.c @@ -0,0 +1,75 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 Intel Corporation <www.intel.com> + */ +#include <common.h> +#include <command.h> +#include <dm.h> + +#include <asm/io.h> +#include <asm/pl310.h> + +static void l2c310_of_parse(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(®s->pl310_ctrl, L2X0_CTRL_EN); + + saved_reg = readl(®s->pl310_aux_ctrl); + if (!dev_read_u32(dev, "prefetch-data", &prefetch)) { + 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", &prefetch)) { + 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, ®s->pl310_aux_ctrl); + + saved_reg = readl(®s->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, ®s->pl310_tag_latency_ctrl); + + saved_reg = readl(®s->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, ®s->pl310_data_latency_ctrl); + + /* Enable the L2 cache */ + setbits_le32(®s->pl310_ctrl, L2X0_CTRL_EN); +} + +static int l2x0_probe(struct udevice *dev) +{ + l2c310_of_parse(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, +};