microblaze: Convert axi timer to DM driver
Move axi timer driver from Microblaze to generic location.
Origin implementation was irq based with counting down timer.
CONFIG_TIMER drivers are designed differently that timer is free running up
timer with automatic reload without any interrupt.
Information about clock rates are find out in timer_pre_probe() that's why
there is no need to get any additional information from DT in the driver
itself (only register offset).
Signed-off-by: Michal Simek <michal.simek@amd.com>
Tested-by: Ovidiu Panait <ovidiu.panait@windriver.com>
Link: https://lore.kernel.org/r/6c12fc86bbc1f17d05c25018862e7b7b03346b36.1654684731.git.michal.simek@amd.com
diff --git a/drivers/timer/Kconfig b/drivers/timer/Kconfig
index 7b8ab56..44d1a81 100644
--- a/drivers/timer/Kconfig
+++ b/drivers/timer/Kconfig
@@ -272,4 +272,12 @@
Select this to enable support for the timer found on
NXP i.MX devices.
+config XILINX_TIMER
+ bool "Xilinx timer support"
+ depends on TIMER
+ select REGMAP
+ help
+ Select this to enable support for the timer found on
+ any Xilinx boards (axi timer).
+
endmenu
diff --git a/drivers/timer/Makefile b/drivers/timer/Makefile
index b2f002d..4d06375 100644
--- a/drivers/timer/Makefile
+++ b/drivers/timer/Makefile
@@ -27,3 +27,4 @@
obj-$(CONFIG_MTK_TIMER) += mtk_timer.o
obj-$(CONFIG_MCHP_PIT64B_TIMER) += mchp-pit64b-timer.o
obj-$(CONFIG_IMX_GPT_TIMER) += imx-gpt-timer.o
+obj-$(CONFIG_XILINX_TIMER) += xilinx-timer.o
diff --git a/drivers/timer/xilinx-timer.c b/drivers/timer/xilinx-timer.c
new file mode 100644
index 0000000..75b4473
--- /dev/null
+++ b/drivers/timer/xilinx-timer.c
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2022 Advanced Micro Devices, Inc
+ * Michal Simek <michal.simek@amd.com>
+ *
+ * (C) Copyright 2007 Michal Simek
+ * Michal SIMEK <monstr@monstr.eu>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <timer.h>
+#include <regmap.h>
+#include <dm/device_compat.h>
+
+#define TIMER_ENABLE_ALL 0x400 /* ENALL */
+#define TIMER_PWM 0x200 /* PWMA0 */
+#define TIMER_INTERRUPT 0x100 /* T0INT */
+#define TIMER_ENABLE 0x080 /* ENT0 */
+#define TIMER_ENABLE_INTR 0x040 /* ENIT0 */
+#define TIMER_RESET 0x020 /* LOAD0 */
+#define TIMER_RELOAD 0x010 /* ARHT0 */
+#define TIMER_EXT_CAPTURE 0x008 /* CAPT0 */
+#define TIMER_EXT_COMPARE 0x004 /* GENT0 */
+#define TIMER_DOWN_COUNT 0x002 /* UDT0 */
+#define TIMER_CAPTURE_MODE 0x001 /* MDT0 */
+
+#define TIMER_CONTROL_OFFSET 0
+#define TIMER_LOADREG_OFFSET 4
+#define TIMER_COUNTER_OFFSET 8
+
+struct xilinx_timer_priv {
+ struct regmap *regs;
+};
+
+static u64 xilinx_timer_get_count(struct udevice *dev)
+{
+ struct xilinx_timer_priv *priv = dev_get_priv(dev);
+ u32 value;
+
+ regmap_read(priv->regs, TIMER_COUNTER_OFFSET, &value);
+
+ return value;
+}
+
+static int xilinx_timer_probe(struct udevice *dev)
+{
+ struct xilinx_timer_priv *priv = dev_get_priv(dev);
+ int ret;
+
+ /* uc_priv->clock_rate has already clock rate */
+ ret = regmap_init_mem(dev_ofnode(dev), &priv->regs);
+ if (ret) {
+ dev_dbg(dev, "failed to get regbase of timer\n");
+ return ret;
+ }
+
+ regmap_write(priv->regs, TIMER_LOADREG_OFFSET, 0);
+ regmap_write(priv->regs, TIMER_CONTROL_OFFSET, TIMER_RESET);
+ regmap_write(priv->regs, TIMER_CONTROL_OFFSET,
+ TIMER_ENABLE | TIMER_RELOAD);
+
+ return 0;
+}
+
+static const struct timer_ops xilinx_timer_ops = {
+ .get_count = xilinx_timer_get_count,
+};
+
+static const struct udevice_id xilinx_timer_ids[] = {
+ { .compatible = "xlnx,xps-timer-1.00.a" },
+ {}
+};
+
+U_BOOT_DRIVER(xilinx_timer) = {
+ .name = "xilinx_timer",
+ .id = UCLASS_TIMER,
+ .of_match = xilinx_timer_ids,
+ .priv_auto = sizeof(struct xilinx_timer_priv),
+ .probe = xilinx_timer_probe,
+ .ops = &xilinx_timer_ops,
+};