[PATCH v6 6/9] riscv: Rework Sifive CLINT as UCLASS_TIMER driver

[Sean Anderson <seanga2@gmail.com>]

This converts the clint driver from the riscv-specific interface to be a
DM-based UCLASS_TIMER driver. In addition, the SiFive DDR driver previously
implicitly depended on the CLINT to select REGMAP.

Unlike Andes's PLMT/PLIC (which AFAIK never have anything pass it a dtb),
the SiFive CLINT is part of the device tree passed in by qemu. This device
tree doesn't have a clocks or clock-frequency property on clint, so we need
to fall back on the timebase-frequency property. Perhaps in the future we
can get a clock-frequency property added to the qemu dtb.

Unlike with the Andes PLMT, the Sifive CLINT is also an IPI controller.
RISCV_SYSCON_CLINT is retained for this purpose.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Pragnesh Patel <pragnesh.patel@openfive.com>
---
This patch builds but has only been tested on the K210 and QEMU. It has NOT
been tested on a HiFive.

(no changes since v5)

Changes in v5:
- Don't add a dependency on REGMAP for SIFIVE_FU540_DDR. Instead, depend on Bin
  Meng's patch.

Changes in v4:
- Use timer_timebase_fallback

Changes in v3:
- Don't initialize the IPI in spl_invoke_opensbi. Further testing has
  revealed it to be unnecessary.

 arch/riscv/Kconfig            |  4 ---
 arch/riscv/lib/sifive_clint.c | 66 +++++++++++++++++++----------------
 2 files changed, 36 insertions(+), 34 deletions(-)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index d9155b9bab..aaa3b833a5 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -155,10 +155,6 @@ config 64BIT
 config SIFIVE_CLINT
 	bool
 	depends on RISCV_MMODE || SPL_RISCV_MMODE
-	select REGMAP
-	select SYSCON
-	select SPL_REGMAP if SPL
-	select SPL_SYSCON if SPL
 	help
 	  The SiFive CLINT block holds memory-mapped control and status registers
 	  associated with software and timer interrupts.
diff --git a/arch/riscv/lib/sifive_clint.c b/arch/riscv/lib/sifive_clint.c
index b9a2c649cc..c9704c596f 100644
--- a/arch/riscv/lib/sifive_clint.c
+++ b/arch/riscv/lib/sifive_clint.c
@@ -8,9 +8,9 @@
  */
 
 #include <common.h>
+#include <clk.h>
 #include <dm.h>
-#include <regmap.h>
-#include <syscon.h>
+#include <timer.h>
 #include <asm/io.h>
 #include <asm/syscon.h>
 #include <linux/err.h>
@@ -24,35 +24,19 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-int riscv_get_time(u64 *time)
-{
-	/* ensure timer register base has a sane value */
-	riscv_init_ipi();
-
-	*time = readq((void __iomem *)MTIME_REG(gd->arch.clint));
-
-	return 0;
-}
-
-int riscv_set_timecmp(int hart, u64 cmp)
-{
-	/* ensure timer register base has a sane value */
-	riscv_init_ipi();
-
-	writeq(cmp, (void __iomem *)MTIMECMP_REG(gd->arch.clint, hart));
-
-	return 0;
-}
-
 int riscv_init_ipi(void)
 {
-	if (!gd->arch.clint) {
-		long *ret = syscon_get_first_range(RISCV_SYSCON_CLINT);
+	int ret;
+	struct udevice *dev;
 
-		if (IS_ERR(ret))
-			return PTR_ERR(ret);
-		gd->arch.clint = ret;
-	}
+	ret = uclass_get_device_by_driver(UCLASS_TIMER,
+					  DM_GET_DRIVER(sifive_clint), &dev);
+	if (ret)
+		return ret;
+
+	gd->arch.clint = dev_read_addr_ptr(dev);
+	if (!gd->arch.clint)
+		return -EINVAL;
 
 	return 0;
 }
@@ -78,14 +62,36 @@ int riscv_get_ipi(int hart, int *pending)
 	return 0;
 }
 
+static int sifive_clint_get_count(struct udevice *dev, u64 *count)
+{
+	*count = readq((void __iomem *)MTIME_REG(dev->priv));
+
+	return 0;
+}
+
+static const struct timer_ops sifive_clint_ops = {
+	.get_count = sifive_clint_get_count,
+};
+
+static int sifive_clint_probe(struct udevice *dev)
+{
+	dev->priv = dev_read_addr_ptr(dev);
+	if (!dev->priv)
+		return -EINVAL;
+
+	return timer_timebase_fallback(dev);
+}
+
 static const struct udevice_id sifive_clint_ids[] = {
-	{ .compatible = "riscv,clint0", .data = RISCV_SYSCON_CLINT },
+	{ .compatible = "riscv,clint0" },
 	{ }
 };
 
 U_BOOT_DRIVER(sifive_clint) = {
 	.name		= "sifive_clint",
-	.id		= UCLASS_SYSCON,
+	.id		= UCLASS_TIMER,
 	.of_match	= sifive_clint_ids,
+	.probe		= sifive_clint_probe,
+	.ops		= &sifive_clint_ops,
 	.flags		= DM_FLAG_PRE_RELOC,
 };
-- 
2.28.0