[PATCH] timer: bcmbca: Add Broadcom BCMBCA timer support

[William Zhang]

This driver supports the peripheral block timer found on the Broadcom
BCA SoCs. It is 30-bit up-count timer running at 50MHz and can be used
as the system clock source such as on BCM63138.

Signed-off-by: William Zhang <william.zhang at broadcom.com>

---

 MAINTAINERS                  |  1 +
 drivers/timer/Kconfig        |  8 ++++
 drivers/timer/Makefile       |  1 +
 drivers/timer/bcmbca_timer.c | 93 ++++++++++++++++++++++++++++++++++++
 4 files changed, 103 insertions(+)
 create mode 100644 drivers/timer/bcmbca_timer.c

diff --git a/MAINTAINERS b/MAINTAINERS
index d1d13c733db4..8c3a7d77f17d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -216,6 +216,7 @@ M:	Joel Peshkin <joel.peshkin at broadcom.com>
 S:	Maintained
 F:	arch/arm/mach-bcmbca/
 F:	board/broadcom/bcmbca/
+F:	drivers/timer/bcmbca-timer.c
 N:	bcmbca
 N:	bcm[9]?47622
 N:	bcm[9]?63148
diff --git a/drivers/timer/Kconfig b/drivers/timer/Kconfig
index 20b5af7e260f..2e5af97b3ad5 100644
--- a/drivers/timer/Kconfig
+++ b/drivers/timer/Kconfig
@@ -125,6 +125,14 @@ config SPL_ATMEL_TCB_TIMER
 	  Select this to enable the use of the timer counter as a monotonic
 	  counter in SPL.
 
+
+config BCMBCA_TIMER
+	bool "Broadcom BCMBCA SoC timer support"
+	depends on TIMER
+	help
+	  Select this to enable peripheral timer support for Broadcom
+	  BCMBCA SoC devices
+
 config CADENCE_TTC_TIMER
 	bool "Cadence TTC (Triple Timer Counter)"
 	depends on TIMER
diff --git a/drivers/timer/Makefile b/drivers/timer/Makefile
index d9822a537009..d581db7563c5 100644
--- a/drivers/timer/Makefile
+++ b/drivers/timer/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_AST_TIMER)	+= ast_timer.o
 obj-$(CONFIG_ATCPIT100_TIMER) += atcpit100_timer.o
 obj-$(CONFIG_$(SPL_)ATMEL_PIT_TIMER) += atmel_pit_timer.o
 obj-$(CONFIG_$(SPL_)ATMEL_TCB_TIMER) += atmel_tcb_timer.o
+obj-$(CONFIG_BCMBCA_TIMER)	+= bcmbca_timer.o
 obj-$(CONFIG_CADENCE_TTC_TIMER)	+= cadence-ttc.o
 obj-$(CONFIG_DESIGNWARE_APB_TIMER)	+= dw-apb-timer.o
 obj-$(CONFIG_GXP_TIMER)		+= gxp-timer.o
diff --git a/drivers/timer/bcmbca_timer.c b/drivers/timer/bcmbca_timer.c
new file mode 100644
index 000000000000..78a8a67f22a7
--- /dev/null
+++ b/drivers/timer/bcmbca_timer.c
@@ -0,0 +1,93 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  Broadcom BCMBCA Broadband SoC timer driver
+ *  Copyright 2022 Broadcom Ltd.
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <timer.h>
+#include <clk.h>
+#include <asm/io.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+
+#define TIMER_CTL 0
+#define TIMER_CNT 0x10
+
+#define BCMBCA_TIMER_ENABLE		BIT(31)
+#define BCMBCA_TIMER_CNT_MASK		0x3fffffff
+#define BCMBCA_TIMER_CNT_HIGH_SHIFT	30
+
+struct bcmbca_timer_priv {
+	void __iomem *reg_base;
+	u32 cnt_high;
+	u32 cnt_low;
+};
+
+static u64 bcmbca_timer_get_count(struct udevice *dev)
+{
+	u64 cnt_high_64;
+	struct bcmbca_timer_priv *priv = dev_get_priv(dev);
+	u32 val = readl(priv->reg_base + TIMER_CNT) & BCMBCA_TIMER_CNT_MASK;
+
+	/* handle hardware counter overflow case*/
+	if (val < priv->cnt_low)
+		priv->cnt_high++;
+	priv->cnt_low = val;
+	cnt_high_64 = (u64)priv->cnt_high;
+
+	return (cnt_high_64 << BCMBCA_TIMER_CNT_HIGH_SHIFT | priv->cnt_low);
+}
+
+static void bcmbca_timer_start(struct udevice *dev)
+{
+	struct bcmbca_timer_priv *priv = dev_get_priv(dev);
+
+	writel(BCMBCA_TIMER_ENABLE | BCMBCA_TIMER_CNT_MASK,
+		   priv->reg_base + TIMER_CTL);
+}
+
+static int bcmbca_timer_probe(struct udevice *dev)
+{
+	struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+	struct bcmbca_timer_priv *priv = dev_get_priv(dev);
+	struct clk clk;
+	int ret;
+
+	priv->reg_base = dev_remap_addr(dev);
+
+	if (!priv->reg_base)
+		return -ENOENT;
+
+	ret = clk_get_by_index(dev, 0, &clk);
+	if (ret)
+		return ret;
+
+	uc_priv->clock_rate = clk_get_rate(&clk);
+	if (!uc_priv->clock_rate)
+		return -EINVAL;
+
+	bcmbca_timer_start(dev);
+
+	return 0;
+}
+
+static const struct timer_ops bcmbca_timer_ops = {
+	.get_count = bcmbca_timer_get_count,
+};
+
+static const struct udevice_id bcmbca_timer_ids[] = {
+	{ .compatible = "brcm,bcm-timers" },
+	{ }
+};
+
+U_BOOT_DRIVER(bcmbca_timer) = {
+	.name = "bcmbca_timer",
+	.id = UCLASS_TIMER,
+	.of_match = bcmbca_timer_ids,
+	.priv_auto = sizeof(struct bcmbca_timer_priv),
+	.probe = bcmbca_timer_probe,
+	.ops = &bcmbca_timer_ops,
+	.flags = DM_FLAG_PRE_RELOC,
+};
-- 
2.37.1

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