Merge tag 'riscv-cache-for-v6.8' of https://git.kernel.org/pub/scm/linux/kernel/git/conor/linux into soc/drivers

RISC-V cache drivers for v6.8

The SiFive composable cache driver moves to the cache driver
subdirectory from the drivers/soc and grows support for non-coherent
cache operations. The immediate user for these is the jh7100 SoC, that
a rake of people have on VisionFive v1 or Beagle-V Starlight boards.

Signed-off-by: Conor Dooley <conor.dooley@microchip.com>

* tag 'riscv-cache-for-v6.8' of https://git.kernel.org/pub/scm/linux/kernel/git/conor/linux:
  riscv: errata: Make ERRATA_STARFIVE_JH7100 depend on !DMA_DIRECT_REMAP
  riscv: errata: Add StarFive JH7100 errata
  soc: sifive: ccache: Add StarFive JH7100 support
  dt-bindings: cache: sifive,ccache0: Add StarFive JH7100 compatible
  soc: sifive: shunt ccache driver to drivers/cache

Link: https://lore.kernel.org/r/20231221-catatonic-monday-d4c61283b136@spud
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

10 files changed, 99 insertions, 26 deletions

diff --git a/Documentation/devicetree/bindings/cache/sifive,ccache0.yaml b/Documentation/devicetree/bindings/cache/sifive,ccache0.yaml
index 8a6a78e1a7ab..7e8cebe21584 100644
--- a/Documentation/devicetree/bindings/cache/sifive,ccache0.yaml
+++ b/Documentation/devicetree/bindings/cache/sifive,ccache0.yaml
@@ -38,7 +38,9 @@ properties:
               - sifive,fu740-c000-ccache
           - const: cache
       - items:
-          - const: starfive,jh7110-ccache
+          - enum:
+              - starfive,jh7100-ccache
+              - starfive,jh7110-ccache
           - const: sifive,ccache0
           - const: cache
       - items:
@@ -88,6 +90,7 @@ allOf:
           contains:
             enum:
               - sifive,fu740-c000-ccache
+              - starfive,jh7100-ccache
               - starfive,jh7110-ccache
               - microchip,mpfs-ccache
 
@@ -111,6 +114,7 @@ allOf:
           contains:
             enum:
               - sifive,fu740-c000-ccache
+              - starfive,jh7100-ccache
               - starfive,jh7110-ccache
 
     then:
diff --git a/MAINTAINERS b/MAINTAINERS
index 089b8183e43c..31d89bc258be 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -19783,6 +19783,13 @@ S:	Supported
 N:	sifive
 K:	[^@]sifive
 
+SIFIVE CACHE DRIVER
+M:	Conor Dooley <conor@kernel.org>
+L:	linux-riscv@lists.infradead.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/cache/sifive,ccache0.yaml
+F:	drivers/cache/sifive_ccache.c
+
 SIFIVE FU540 SYSTEM-ON-CHIP
 M:	Paul Walmsley <paul.walmsley@sifive.com>
 M:	Palmer Dabbelt <palmer@dabbelt.com>
@@ -19798,13 +19805,6 @@ S:	Maintained
 F:	Documentation/devicetree/bindings/dma/sifive,fu540-c000-pdma.yaml
 F:	drivers/dma/sf-pdma/
 
-SIFIVE SOC DRIVERS
-M:	Conor Dooley <conor@kernel.org>
-L:	linux-riscv@lists.infradead.org
-S:	Maintained
-T:	git https://git.kernel.org/pub/scm/linux/kernel/git/conor/linux.git/
-F:	Documentation/devicetree/bindings/cache/sifive,ccache0.yaml
-F:	drivers/soc/sifive/
 
 SILEAD TOUCHSCREEN DRIVER
 M:	Hans de Goede <hdegoede@redhat.com>
diff --git a/arch/riscv/Kconfig.errata b/arch/riscv/Kconfig.errata
index e2c731cfed8c..f5c432b005e7 100644
--- a/arch/riscv/Kconfig.errata
+++ b/arch/riscv/Kconfig.errata
@@ -53,6 +53,25 @@ config ERRATA_SIFIVE_CIP_1200
 
 	  If you don't know what to do here, say "Y".
 
+config ERRATA_STARFIVE_JH7100
+	bool "StarFive JH7100 support"
+	depends on ARCH_STARFIVE
+	depends on !DMA_DIRECT_REMAP
+	depends on NONPORTABLE
+	select DMA_GLOBAL_POOL
+	select RISCV_DMA_NONCOHERENT
+	select RISCV_NONSTANDARD_CACHE_OPS
+	select SIFIVE_CCACHE
+	default n
+	help
+	  The StarFive JH7100 was a test chip for the JH7110 and has
+	  caches that are non-coherent with respect to peripheral DMAs.
+	  It was designed before the Zicbom extension so needs non-standard
+	  cache operations through the SiFive cache controller.
+
+	  Say "Y" if you want to support the BeagleV Starlight and/or
+	  StarFive VisionFive V1 boards.
+
 config ERRATA_THEAD
 	bool "T-HEAD errata"
 	depends on RISCV_ALTERNATIVE
diff --git a/drivers/cache/Kconfig b/drivers/cache/Kconfig
index d6e5e3abaad8..9345ce4976d7 100644
--- a/drivers/cache/Kconfig
+++ b/drivers/cache/Kconfig
@@ -8,4 +8,10 @@ config AX45MP_L2_CACHE
 	help
 	  Support for the L2 cache controller on Andes Technology AX45MP platforms.
 
+config SIFIVE_CCACHE
+	bool "Sifive Composable Cache controller"
+	depends on ARCH_SIFIVE || ARCH_STARFIVE
+	help
+	  Support for the composable cache controller on SiFive platforms.
+
 endmenu
diff --git a/drivers/cache/Makefile b/drivers/cache/Makefile
index 2012e7fb978d..7657cff3bd6c 100644
--- a/drivers/cache/Makefile
+++ b/drivers/cache/Makefile
@@ -1,3 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0
 
-obj-$(CONFIG_AX45MP_L2_CACHE) += ax45mp_cache.o
+obj-$(CONFIG_AX45MP_L2_CACHE)	+= ax45mp_cache.o
+obj-$(CONFIG_SIFIVE_CCACHE)	+= sifive_ccache.o
diff --git a/drivers/soc/sifive/sifive_ccache.c b/drivers/cache/sifive_ccache.c
index 3684f5b40a80..89ed6cd6b059 100644
--- a/drivers/soc/sifive/sifive_ccache.c
+++ b/drivers/cache/sifive_ccache.c
@@ -8,13 +8,16 @@
 
 #define pr_fmt(fmt) "CCACHE: " fmt
 
+#include <linux/align.h>
 #include <linux/debugfs.h>
 #include <linux/interrupt.h>
 #include <linux/of_irq.h>
 #include <linux/of_address.h>
 #include <linux/device.h>
 #include <linux/bitfield.h>
+#include <asm/cacheflush.h>
 #include <asm/cacheinfo.h>
+#include <asm/dma-noncoherent.h>
 #include <soc/sifive/sifive_ccache.h>
 
 #define SIFIVE_CCACHE_DIRECCFIX_LOW 0x100
@@ -39,10 +42,14 @@
 #define SIFIVE_CCACHE_CONFIG_SETS_MASK GENMASK_ULL(23, 16)
 #define SIFIVE_CCACHE_CONFIG_BLKS_MASK GENMASK_ULL(31, 24)
 
+#define SIFIVE_CCACHE_FLUSH64 0x200
+#define SIFIVE_CCACHE_FLUSH32 0x240
+
 #define SIFIVE_CCACHE_WAYENABLE 0x08
 #define SIFIVE_CCACHE_ECCINJECTERR 0x40
 
 #define SIFIVE_CCACHE_MAX_ECCINTR 4
+#define SIFIVE_CCACHE_LINE_SIZE 64
 
 static void __iomem *ccache_base;
 static int g_irq[SIFIVE_CCACHE_MAX_ECCINTR];
@@ -56,6 +63,11 @@ enum {
 	DIR_UNCORR,
 };
 
+enum {
+	QUIRK_NONSTANDARD_CACHE_OPS	= BIT(0),
+	QUIRK_BROKEN_DATA_UNCORR	= BIT(1),
+};
+
 #ifdef CONFIG_DEBUG_FS
 static struct dentry *sifive_test;
 
@@ -106,6 +118,8 @@ static void ccache_config_read(void)
 static const struct of_device_id sifive_ccache_ids[] = {
 	{ .compatible = "sifive,fu540-c000-ccache" },
 	{ .compatible = "sifive,fu740-c000-ccache" },
+	{ .compatible = "starfive,jh7100-ccache",
+	  .data = (void *)(QUIRK_NONSTANDARD_CACHE_OPS | QUIRK_BROKEN_DATA_UNCORR) },
 	{ .compatible = "sifive,ccache0" },
 	{ /* end of table */ }
 };
@@ -124,6 +138,34 @@ int unregister_sifive_ccache_error_notifier(struct notifier_block *nb)
 }
 EXPORT_SYMBOL_GPL(unregister_sifive_ccache_error_notifier);
 
+#ifdef CONFIG_RISCV_NONSTANDARD_CACHE_OPS
+static void ccache_flush_range(phys_addr_t start, size_t len)
+{
+	phys_addr_t end = start + len;
+	phys_addr_t line;
+
+	if (!len)
+		return;
+
+	mb();
+	for (line = ALIGN_DOWN(start, SIFIVE_CCACHE_LINE_SIZE); line < end;
+			line += SIFIVE_CCACHE_LINE_SIZE) {
+#ifdef CONFIG_32BIT
+		writel(line >> 4, ccache_base + SIFIVE_CCACHE_FLUSH32);
+#else
+		writeq(line, ccache_base + SIFIVE_CCACHE_FLUSH64);
+#endif
+		mb();
+	}
+}
+
+static const struct riscv_nonstd_cache_ops ccache_mgmt_ops __initconst = {
+	.wback = &ccache_flush_range,
+	.inv = &ccache_flush_range,
+	.wback_inv = &ccache_flush_range,
+};
+#endif /* CONFIG_RISCV_NONSTANDARD_CACHE_OPS */
+
 static int ccache_largest_wayenabled(void)
 {
 	return readl(ccache_base + SIFIVE_CCACHE_WAYENABLE) & 0xFF;
@@ -210,11 +252,15 @@ static int __init sifive_ccache_init(void)
 	struct device_node *np;
 	struct resource res;
 	int i, rc, intr_num;
+	const struct of_device_id *match;
+	unsigned long quirks;
 
-	np = of_find_matching_node(NULL, sifive_ccache_ids);
+	np = of_find_matching_node_and_match(NULL, sifive_ccache_ids, &match);
 	if (!np)
 		return -ENODEV;
 
+	quirks = (uintptr_t)match->data;
+
 	if (of_address_to_resource(np, 0, &res)) {
 		rc = -ENODEV;
 		goto err_node_put;
@@ -240,6 +286,10 @@ static int __init sifive_ccache_init(void)
 
 	for (i = 0; i < intr_num; i++) {
 		g_irq[i] = irq_of_parse_and_map(np, i);
+
+		if (i == DATA_UNCORR && (quirks & QUIRK_BROKEN_DATA_UNCORR))
+			continue;
+
 		rc = request_irq(g_irq[i], ccache_int_handler, 0, "ccache_ecc",
 				 NULL);
 		if (rc) {
@@ -249,6 +299,14 @@ static int __init sifive_ccache_init(void)
 	}
 	of_node_put(np);
 
+#ifdef CONFIG_RISCV_NONSTANDARD_CACHE_OPS
+	if (quirks & QUIRK_NONSTANDARD_CACHE_OPS) {
+		riscv_cbom_block_size = SIFIVE_CCACHE_LINE_SIZE;
+		riscv_noncoherent_supported();
+		riscv_noncoherent_register_cache_ops(&ccache_mgmt_ops);
+	}
+#endif
+
 	ccache_config_read();
 
 	ccache_cache_ops.get_priv_group = ccache_get_priv_group;
@@ -269,4 +327,4 @@ err_node_put:
 	return rc;
 }
 
-device_initcall(sifive_ccache_init);
+arch_initcall(sifive_ccache_init);
diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig
index 10a9ff84ff41..5d924e946507 100644
--- a/drivers/soc/Kconfig
+++ b/drivers/soc/Kconfig
@@ -22,7 +22,6 @@ source "drivers/soc/qcom/Kconfig"
 source "drivers/soc/renesas/Kconfig"
 source "drivers/soc/rockchip/Kconfig"
 source "drivers/soc/samsung/Kconfig"
-source "drivers/soc/sifive/Kconfig"
 source "drivers/soc/sunxi/Kconfig"
 source "drivers/soc/tegra/Kconfig"
 source "drivers/soc/ti/Kconfig"
diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile
index 0706a27d13be..ba8f5b5460e1 100644
--- a/drivers/soc/Makefile
+++ b/drivers/soc/Makefile
@@ -28,7 +28,6 @@ obj-y				+= qcom/
 obj-y				+= renesas/
 obj-y				+= rockchip/
 obj-$(CONFIG_SOC_SAMSUNG)	+= samsung/
-obj-y				+= sifive/
 obj-y				+= sunxi/
 obj-$(CONFIG_ARCH_TEGRA)	+= tegra/
 obj-y				+= ti/
diff --git a/drivers/soc/sifive/Kconfig b/drivers/soc/sifive/Kconfig
deleted file mode 100644
index 139884addc41..000000000000
--- a/drivers/soc/sifive/Kconfig
+++ /dev/null
@@ -1,10 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-
-if ARCH_SIFIVE || ARCH_STARFIVE
-
-config SIFIVE_CCACHE
-	bool "Sifive Composable Cache controller"
-	help
-	  Support for the composable cache controller on SiFive platforms.
-
-endif
diff --git a/drivers/soc/sifive/Makefile b/drivers/soc/sifive/Makefile
deleted file mode 100644
index 1f5dc339bf82..000000000000
--- a/drivers/soc/sifive/Makefile
+++ /dev/null
@@ -1,3 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-
-obj-$(CONFIG_SIFIVE_CCACHE)	+= sifive_ccache.o