[U-Boot] [PATCH 1/6] dm: cache: add v5l2 cache controller driver

Andes uboot at andestech.com
Tue May 28 09:39:09 UTC 2019 

From: Rick Chen <rick at andestech.com>

Add a v5l2 cache controller driver that is usually found on
Andes RISC-V ae350 platform. It will parse the cache settings
from the dtb.

In this version tag and data ram control timing can be adjusted
by the requirement from the dtb.

Signed-off-by: Rick Chen <rick at andestech.com>
Cc: Greentime Hu <greentime at andestech.com>
---
 arch/riscv/include/asm/global_data.h |   3 ++
 arch/riscv/include/asm/v5l2cache.h   |  61 +++++++++++++++++++++
 drivers/cache/Kconfig                |   9 ++++
 drivers/cache/Makefile               |   1 +
 drivers/cache/cache-v5l2.c           | 102 +++++++++++++++++++++++++++++++++++
 5 files changed, 176 insertions(+)
 create mode 100644 arch/riscv/include/asm/v5l2cache.h
 create mode 100644 drivers/cache/cache-v5l2.c

diff --git a/arch/riscv/include/asm/global_data.h b/arch/riscv/include/asm/global_data.h
index b74bd7e..6e52d5d 100644
--- a/arch/riscv/include/asm/global_data.h
+++ b/arch/riscv/include/asm/global_data.h
@@ -24,6 +24,9 @@ struct arch_global_data {
 #ifdef CONFIG_ANDES_PLMT
 	void __iomem *plmt;	/* plmt base address */
 #endif
+#ifdef CONFIG_V5L2_CACHE
+	void __iomem *v5l2;	/* v5l2 base address */
+#endif
 #ifdef CONFIG_SMP
 	struct ipi_data ipi[CONFIG_NR_CPUS];
 #endif
diff --git a/arch/riscv/include/asm/v5l2cache.h b/arch/riscv/include/asm/v5l2cache.h
new file mode 100644
index 0000000..8ed1c6c
--- /dev/null
+++ b/arch/riscv/include/asm/v5l2cache.h
@@ -0,0 +1,61 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2019 Andes Technology Corporation
+ * Rick Chen, Andes Technology Corporation <rick at andestech.com>
+ */
+
+#ifndef _ASM_V5_L2CACHE_H
+#define _ASM_V5_L2CACHE_H
+
+struct l2cache {
+	volatile u64	configure;
+	volatile u64	control;
+	volatile u64	hpm0;
+	volatile u64	hpm1;
+	volatile u64	hpm2;
+	volatile u64	hpm3;
+	volatile u64	error_status;
+	volatile u64	ecc_error;
+	volatile u64	cctl_command0;
+	volatile u64	cctl_access_line0;
+	volatile u64	cctl_command1;
+	volatile u64	cctl_access_line1;
+	volatile u64	cctl_command2;
+	volatile u64	cctl_access_line2;
+	volatile u64	cctl_command3;
+	volatile u64	cctl_access_line4;
+	volatile u64	cctl_status;
+};
+
+/* Control Register */
+#define L2_ENABLE	0x1
+/* prefetch */
+#define IPREPETCH_OFF	3
+#define DPREPETCH_OFF	5
+#define IPREPETCH_MSK	(3 << IPREPETCH_OFF)
+#define DPREPETCH_MSK	(3 << DPREPETCH_OFF)
+/* tag ram */
+#define TRAMOCTL_OFF	8
+#define TRAMICTL_OFF	10
+#define TRAMOCTL_MSK	(3 << TRAMOCTL_OFF)
+#define TRAMICTL_MSK	BIT(TRAMICTL_OFF)
+/* data ram */
+#define DRAMOCTL_OFF	11
+#define DRAMICTL_OFF	13
+#define DRAMOCTL_MSK	(3 << DRAMOCTL_OFF)
+#define DRAMICTL_MSK	BIT(DRAMICTL_OFF)
+
+/* CCTL Command Register */
+#define CCTL_CMD_REG(base, hart)	((ulong)(base) + 0x40 + (hart) * 0x10)
+#define L2_WBINVAL_ALL	0x12
+
+/* CCTL Status Register */
+#define CCTL_STATUS_MSK(hart)		(0xf << ((hart) * 4))
+#define CCTL_STATUS_IDLE(hart)		(0 << ((hart) * 4))
+#define CCTL_STATUS_PROCESS(hart)	(1 << ((hart) * 4))
+#define CCTL_STATUS_ILLEGAL(hart)	(2 << ((hart) * 4))
+
+void v5l2_enable(void);
+void v5l2_disable(void);
+
+#endif /* _ASM_V5_L2CACHE_H */
diff --git a/drivers/cache/Kconfig b/drivers/cache/Kconfig
index 24def7a..665689a 100644
--- a/drivers/cache/Kconfig
+++ b/drivers/cache/Kconfig
@@ -22,4 +22,13 @@ config L2X0_CACHE
 	  ARMv7(32-bit) devices. The driver configures the cache settings
 	  found in the device tree.
 
+config V5L2_CACHE
+	tristate "Andes V5L2 cache driver"
+	select CACHE
+	depends on RISCV_NDS_CACHE
+	help
+	  Support Andes V5L2 cache controller in AE350 platform.
+	  It will configure tag and data ram timing control from the
+	  device tree and enable L2 cache.
+
 endmenu
diff --git a/drivers/cache/Makefile b/drivers/cache/Makefile
index 9deb961..4a6458c 100644
--- a/drivers/cache/Makefile
+++ b/drivers/cache/Makefile
@@ -2,3 +2,4 @@
 obj-$(CONFIG_CACHE) += cache-uclass.o
 obj-$(CONFIG_SANDBOX) += sandbox_cache.o
 obj-$(CONFIG_L2X0_CACHE) += cache-l2x0.o
+obj-$(CONFIG_V5L2_CACHE) += cache-v5l2.o
diff --git a/drivers/cache/cache-v5l2.c b/drivers/cache/cache-v5l2.c
new file mode 100644
index 0000000..7022feb
--- /dev/null
+++ b/drivers/cache/cache-v5l2.c
@@ -0,0 +1,102 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2019 Andes Technology Corporation
+ * Rick Chen, Andes Technology Corporation <rick at andestech.com>
+ */
+
+#include <common.h>
+#include <command.h>
+#include <dm.h>
+#include <asm/io.h>
+#include <dm/ofnode.h>
+#include <asm/v5l2cache.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+void v5l2_enable(void)
+{
+	struct l2cache *regs = gd->arch.v5l2;
+
+	if (regs)
+		setbits_le32(&regs->control, L2_ENABLE);
+}
+
+void v5l2_disable(void)
+{
+	volatile struct l2cache *regs = gd->arch.v5l2;
+	u8 hart = gd->arch.boot_hart;
+	void __iomem *cctlcmd = (void __iomem *)CCTL_CMD_REG(gd->arch.v5l2, hart);
+
+	if ((regs) && (readl(&regs->control) & L2_ENABLE)) {
+		writel(L2_WBINVAL_ALL, cctlcmd);
+
+		while ((readl(&regs->cctl_status) & CCTL_STATUS_MSK(hart))) {
+			if ((readl(&regs->cctl_status) & CCTL_STATUS_ILLEGAL(hart))) {
+				printf("L2 flush illegal! hanging...");
+				hang();
+			}
+		}
+		clrbits_le32(&regs->control, L2_ENABLE);
+	}
+}
+
+static void v5l2_of_parse_and_init(struct udevice *dev)
+{
+	struct l2cache *regs;
+	u32 ctl_val, prefetch;
+	u32 tram_ctl[2];
+	u32 dram_ctl[2];
+
+	regs = (struct l2cache *)dev_read_addr(dev);
+	gd->arch.v5l2 = regs;
+	ctl_val = readl(&regs->control);
+
+	if (!(ctl_val & L2_ENABLE))
+		ctl_val |= L2_ENABLE;
+
+	/* Instruction and data fetch prefetch depth */
+	if (!dev_read_u32(dev, "andes,inst-prefetch", &prefetch)) {
+		ctl_val &= ~(IPREPETCH_MSK);
+		ctl_val |= (prefetch << IPREPETCH_OFF);
+	}
+
+	if (!dev_read_u32(dev, "andes,data-prefetch", &prefetch)) {
+		ctl_val &= ~(DPREPETCH_MSK);
+		ctl_val |= (prefetch << DPREPETCH_OFF);
+	}
+
+	/* Set tag RAM and data RAM setup and output cycle */
+	if (!dev_read_u32_array(dev, "andes,tag-ram-ctl", tram_ctl, 2)) {
+		ctl_val &= ~(TRAMOCTL_MSK | TRAMICTL_MSK);
+		ctl_val |= tram_ctl[0] << TRAMOCTL_OFF;
+		ctl_val |= tram_ctl[1] << TRAMICTL_OFF;
+	}
+
+	if (!dev_read_u32_array(dev, "andes,data-ram-ctl", dram_ctl, 2)) {
+		ctl_val &= ~(DRAMOCTL_MSK | DRAMICTL_MSK);
+		ctl_val |= dram_ctl[0] << DRAMOCTL_OFF;
+		ctl_val |= dram_ctl[1] << DRAMICTL_OFF;
+	}
+
+	writel(ctl_val, &regs->control);
+}
+
+static int v5l2_probe(struct udevice *dev)
+{
+	v5l2_of_parse_and_init(dev);
+
+	return 0;
+}
+
+static const struct udevice_id v5l2_cache_ids[] = {
+	{ .compatible = "cache" },
+	{}
+};
+
+U_BOOT_DRIVER(v5l2_cache) = {
+	.name   = "v5l2_cache",
+	.id     = UCLASS_CACHE,
+	.of_match = v5l2_cache_ids,
+	.probe	= v5l2_probe,
+	.flags  = DM_FLAG_PRE_RELOC,
+};
-- 
2.7.4

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