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.zh...@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.pesh...@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
smime.p7s
Description: S/MIME Cryptographic Signature
