cache: add sifive composable cache driver

This driver is currently responsible for enabling all ccache ways.
Composable cache could be configure as RAM or cache, we will use it as
RAM at the beginning to put the u-boot SPL there. In u-boot proper
phrase, we will use the composable cache as cache, and try to enable the
cache ways.

Signed-off-by: Zong Li <zong.li@sifive.com>
Reviewed-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Rick Chen <rick@andestech.com>

diff --git a/drivers/cache/Kconfig b/drivers/cache/Kconfig
index 1e452ad6d9f86b4fee096f47b5d86606201c6862..40f41a817c9c16a52a8a412c72328b3190aef7e3 100644 (file)
--- a/drivers/cache/Kconfig
+++ b/drivers/cache/Kconfig
@@ -39,4 +39,11 @@ config NCORE_CACHE
          controller. The driver initializes cache directories and coherent
          agent interfaces.
 
+config SIFIVE_CCACHE
+       bool "SiFive composable cache"
+       select CACHE
+       help
+         This driver is for SiFive Composable L2/L3 cache. It enables cache
+         ways of composable cache.
+
 endmenu

diff --git a/drivers/cache/Makefile b/drivers/cache/Makefile
index fed50be3f983a8577592be8f0b93b6cbcec30dd8..ad765774e32b9175978533c8c8c52647deee2a9c 100644 (file)
--- a/drivers/cache/Makefile
+++ b/drivers/cache/Makefile
@@ -4,3 +4,4 @@ obj-$(CONFIG_SANDBOX) += sandbox_cache.o
 obj-$(CONFIG_L2X0_CACHE) += cache-l2x0.o
 obj-$(CONFIG_NCORE_CACHE) += cache-ncore.o
 obj-$(CONFIG_V5L2_CACHE) += cache-v5l2.o
+obj-$(CONFIG_SIFIVE_CCACHE) += cache-sifive-ccache.o

diff --git a/drivers/cache/cache-sifive-ccache.c b/drivers/cache/cache-sifive-ccache.c
new file mode 100644 (file)
index 0000000..76c0ab2
--- /dev/null
+++ b/drivers/cache/cache-sifive-ccache.c
@@ -0,0 +1,75 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2021 SiFive
+ */
+
+#include <common.h>
+#include <cache.h>
+#include <dm.h>
+#include <asm/io.h>
+#include <dm/device.h>
+#include <linux/bitfield.h>
+
+#define SIFIVE_CCACHE_CONFIG           0x000
+#define SIFIVE_CCACHE_CONFIG_WAYS      GENMASK(15, 8)
+
+#define SIFIVE_CCACHE_WAY_ENABLE       0x008
+
+struct sifive_ccache {
+       void __iomem *base;
+};
+
+static int sifive_ccache_enable(struct udevice *dev)
+{
+       struct sifive_ccache *priv = dev_get_priv(dev);
+       u32 config;
+       u32 ways;
+
+       /* Enable all ways of composable cache */
+       config = readl(priv->base + SIFIVE_CCACHE_CONFIG);
+       ways = FIELD_GET(SIFIVE_CCACHE_CONFIG_WAYS, config);
+
+       writel(ways - 1, priv->base + SIFIVE_CCACHE_WAY_ENABLE);
+
+       return 0;
+}
+
+static int sifive_ccache_get_info(struct udevice *dev, struct cache_info *info)
+{
+       struct sifive_ccache *priv = dev_get_priv(dev);
+
+       info->base = (phys_addr_t)priv->base;
+
+       return 0;
+}
+
+static const struct cache_ops sifive_ccache_ops = {
+       .enable = sifive_ccache_enable,
+       .get_info = sifive_ccache_get_info,
+};
+
+static int sifive_ccache_probe(struct udevice *dev)
+{
+       struct sifive_ccache *priv = dev_get_priv(dev);
+
+       priv->base = dev_read_addr_ptr(dev);
+       if (!priv->base)
+               return -EINVAL;
+
+       return 0;
+}
+
+static const struct udevice_id sifive_ccache_ids[] = {
+       { .compatible = "sifive,fu540-c000-ccache" },
+       { .compatible = "sifive,fu740-c000-ccache" },
+       {}
+};
+
+U_BOOT_DRIVER(sifive_ccache) = {
+       .name = "sifive_ccache",
+       .id = UCLASS_CACHE,
+       .of_match = sifive_ccache_ids,
+       .probe = sifive_ccache_probe,
+       .priv_auto = sizeof(struct sifive_ccache),
+       .ops = &sifive_ccache_ops,
+};