timer: Add Cadence TTC timer counter support

This driver was tested on Xilinx ZynqMP SoC.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>

diff --git a/MAINTAINERS b/MAINTAINERS
index 60d4adf266649594440216ea1ecac93a072d14b5..5b139e51acf130a09178b347ad67f10caa4d3d0d 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -288,6 +288,7 @@ F:  drivers/net/zynq_gem.c
 F:     drivers/serial/serial_zynq.c
 F:     drivers/spi/zynq_qspi.c
 F:     drivers/spi/zynq_spi.c
+F:     drivers/timer/cadence-ttc.c
 F:     drivers/usb/host/ehci-zynq.c
 F:     drivers/watchdog/cdns_wdt.c
 F:     include/zynqmppl.h

diff --git a/drivers/timer/Kconfig b/drivers/timer/Kconfig
index 2c968967262787051bae58dd100e716e2e3610a5..8a31397553df3a1b9d9abd9265397ce37f1cc48a 100644 (file)
--- a/drivers/timer/Kconfig
+++ b/drivers/timer/Kconfig
@@ -52,6 +52,13 @@ config ATMEL_PIT_TIMER
          it is designed to offer maximum accuracy and efficient management,
          even for systems with long response time.
 
+config CADENCE_TTC_TIMER
+       bool "Cadence TTC (Triple Timer Counter)"
+       depends on TIMER
+       help
+         Enables support for the cadence ttc driver. This driver is present
+         on Xilinx Zynq and ZynqMP SoCs.
+
 config SANDBOX_TIMER
        bool "Sandbox timer support"
        depends on SANDBOX && TIMER

diff --git a/drivers/timer/Makefile b/drivers/timer/Makefile
index a8b531ab7b2b401065b445201164f4d82f6fbd10..ee2fcb1fa716342a2e62ad70f03615fb5cd0ff15 100644 (file)
--- a/drivers/timer/Makefile
+++ b/drivers/timer/Makefile
@@ -4,6 +4,7 @@
 
 obj-y += timer-uclass.o
 obj-$(CONFIG_ALTERA_TIMER)     += altera_timer.o
+obj-$(CONFIG_CADENCE_TTC_TIMER)        += cadence-ttc.o
 obj-$(CONFIG_SANDBOX_TIMER)    += sandbox_timer.o
 obj-$(CONFIG_X86_TSC_TIMER)    += tsc_timer.o
 obj-$(CONFIG_OMAP_TIMER)       += omap-timer.o

diff --git a/drivers/timer/cadence-ttc.c b/drivers/timer/cadence-ttc.c
new file mode 100644 (file)
index 0000000..5b91c8a
--- /dev/null
+++ b/drivers/timer/cadence-ttc.c
@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 Xilinx, Inc. (Michal Simek)
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <timer.h>
+#include <asm/io.h>
+
+#define CNT_CNTRL_RESET                BIT(4)
+
+struct cadence_ttc_regs {
+       u32 clk_cntrl1; /* 0x0 - Clock Control 1 */
+       u32 clk_cntrl2; /* 0x4 - Clock Control 2 */
+       u32 clk_cntrl3; /* 0x8 - Clock Control 3 */
+       u32 counter_cntrl1; /* 0xC - Counter Control 1 */
+       u32 counter_cntrl2; /* 0x10 - Counter Control 2 */
+       u32 counter_cntrl3; /* 0x14 - Counter Control 3 */
+       u32 counter_val1; /* 0x18 - Counter Control 1 */
+       u32 counter_val2; /* 0x1C - Counter Control 2 */
+       u32 counter_val3; /* 0x20 - Counter Control 3 */
+       u32 reserved[15];
+       u32 interrupt_enable1; /* 0x60 - Interrupt Enable 1 */
+       u32 interrupt_enable2; /* 0x64 - Interrupt Enable 2 */
+       u32 interrupt_enable3; /* 0x68 - Interrupt Enable 3 */
+};
+
+struct cadence_ttc_priv {
+       struct cadence_ttc_regs *regs;
+};
+
+static int cadence_ttc_get_count(struct udevice *dev, u64 *count)
+{
+       struct cadence_ttc_priv *priv = dev_get_priv(dev);
+
+       *count = readl(&priv->regs->counter_val1);
+
+       return 0;
+}
+
+static int cadence_ttc_probe(struct udevice *dev)
+{
+       struct cadence_ttc_priv *priv = dev_get_priv(dev);
+
+       /* Disable interrupts for sure */
+       writel(0, &priv->regs->interrupt_enable1);
+       writel(0, &priv->regs->interrupt_enable2);
+       writel(0, &priv->regs->interrupt_enable3);
+
+       /* Make sure that clocks are configured properly without prescaller */
+       writel(0, &priv->regs->clk_cntrl1);
+       writel(0, &priv->regs->clk_cntrl2);
+       writel(0, &priv->regs->clk_cntrl3);
+
+       /* Reset and enable this counter */
+       writel(CNT_CNTRL_RESET, &priv->regs->counter_cntrl1);
+
+       return 0;
+}
+
+static int cadence_ttc_ofdata_to_platdata(struct udevice *dev)
+{
+       struct cadence_ttc_priv *priv = dev_get_priv(dev);
+
+       priv->regs = map_physmem(devfdt_get_addr(dev),
+                                sizeof(struct cadence_ttc_regs), MAP_NOCACHE);
+
+       return 0;
+}
+
+static const struct timer_ops cadence_ttc_ops = {
+       .get_count = cadence_ttc_get_count,
+};
+
+static const struct udevice_id cadence_ttc_ids[] = {
+       { .compatible = "cdns,ttc" },
+       {}
+};
+
+U_BOOT_DRIVER(cadence_ttc) = {
+       .name = "cadence_ttc",
+       .id = UCLASS_TIMER,
+       .of_match = cadence_ttc_ids,
+       .ofdata_to_platdata = cadence_ttc_ofdata_to_platdata,
+       .priv_auto_alloc_size = sizeof(struct cadence_ttc_priv),
+       .probe = cadence_ttc_probe,
+       .ops = &cadence_ttc_ops,
+       .flags = DM_FLAG_PRE_RELOC,
+};