riscv: Rename SiFive CLINT to RISC-V ALINT

As the RISC-V ACLINT specification is defined to be backward compatible
with the SiFive CLINT specification, we rename SiFive CLINT to RISC-V
ALINT in the source tree to be future-proof.

Signed-off-by: Bin Meng <bmeng@tinylab.org>
Reviewed-by: Rick Chen <rick@andestech.com>

1 files changed, 74 insertions, 0 deletions

diff --git a/drivers/timer/riscv_aclint_timer.c b/drivers/timer/riscv_aclint_timer.c
new file mode 100644
index 0000000000..e29d527c8d
--- /dev/null
+++ b/drivers/timer/riscv_aclint_timer.c
@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2020, Sean Anderson <seanga2@gmail.com>
+ * Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <timer.h>
+#include <asm/io.h>
+#include <dm/device-internal.h>
+#include <linux/err.h>
+
+#define CLINT_MTIME_OFFSET		0xbff8
+#define ACLINT_MTIME_OFFSET		0
+
+/* mtime register */
+#define MTIME_REG(base, offset)		((ulong)(base) + (offset))
+
+static u64 notrace riscv_aclint_timer_get_count(struct udevice *dev)
+{
+	return readq((void __iomem *)MTIME_REG(dev_get_priv(dev),
+					       dev_get_driver_data(dev)));
+}
+
+#if CONFIG_IS_ENABLED(RISCV_MMODE) && IS_ENABLED(CONFIG_TIMER_EARLY)
+/**
+ * timer_early_get_rate() - Get the timer rate before driver model
+ */
+unsigned long notrace timer_early_get_rate(void)
+{
+	return RISCV_MMODE_TIMER_FREQ;
+}
+
+/**
+ * timer_early_get_count() - Get the timer count before driver model
+ *
+ */
+u64 notrace timer_early_get_count(void)
+{
+	return readq((void __iomem *)MTIME_REG(RISCV_MMODE_TIMERBASE,
+					       RISCV_MMODE_TIMEROFF));
+}
+#endif
+
+static const struct timer_ops riscv_aclint_timer_ops = {
+	.get_count = riscv_aclint_timer_get_count,
+};
+
+static int riscv_aclint_timer_probe(struct udevice *dev)
+{
+	dev_set_priv(dev, dev_read_addr_ptr(dev));
+	if (!dev_get_priv(dev))
+		return -EINVAL;
+
+	return timer_timebase_fallback(dev);
+}
+
+static const struct udevice_id riscv_aclint_timer_ids[] = {
+	{ .compatible = "riscv,clint0", .data = CLINT_MTIME_OFFSET },
+	{ .compatible = "sifive,clint0", .data = CLINT_MTIME_OFFSET },
+	{ .compatible = "riscv,aclint-mtimer", .data = ACLINT_MTIME_OFFSET },
+	{ }
+};
+
+U_BOOT_DRIVER(riscv_aclint_timer) = {
+	.name		= "riscv_aclint_timer",
+	.id		= UCLASS_TIMER,
+	.of_match	= riscv_aclint_timer_ids,
+	.probe		= riscv_aclint_timer_probe,
+	.ops		= &riscv_aclint_timer_ops,
+	.flags		= DM_FLAG_PRE_RELOC,
+};