Adding a timer driver for omap devices based on driver model
and device tree.
Signed-off-by: Mugunthan V N <mugunthan...@ti.com>
---
drivers/timer/Kconfig | 6 +++
drivers/timer/Makefile | 1 +
drivers/timer/omap-timer.c | 108 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 115 insertions(+)
create mode 100644 drivers/timer/omap-timer.c
diff --git a/drivers/timer/Kconfig b/drivers/timer/Kconfig
index 2b10d2b..ff65a73 100644
--- a/drivers/timer/Kconfig
+++ b/drivers/timer/Kconfig
@@ -30,4 +30,10 @@ config X86_TSC_TIMER
help
Select this to enable Time-Stamp Counter (TSC) timer for x86.
+config OMAP_TIMER
+ bool "Omap timer support"
+ depends on TIMER
+ help
+ Select this to enable an timer for Omap devices.
+
endmenu
diff --git a/drivers/timer/Makefile b/drivers/timer/Makefile
index fe954ec..f351fbb 100644
--- a/drivers/timer/Makefile
+++ b/drivers/timer/Makefile
@@ -8,3 +8,4 @@ obj-$(CONFIG_TIMER) += timer-uclass.o
obj-$(CONFIG_ALTERA_TIMER) += altera_timer.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/omap-timer.c b/drivers/timer/omap-timer.c
new file mode 100644
index 0000000..3bb38c5
--- /dev/null
+++ b/drivers/timer/omap-timer.c
@@ -0,0 +1,108 @@
+/*
+ * TI OMAP timer driver
+ *
+ * Copyright (C) 2015, Texas Instruments, Incorporated
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <timer.h>
+#include <asm/io.h>
+#include <asm/arch/clock.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* Timer register bits */
+#define TCLR_START BIT(0) /* Start=1 */
+#define TCLR_AUTO_RELOAD BIT(1) /* Auto reload */
+#define TCLR_PRE_EN BIT(5) /* Pre-scaler enable */
+#define TCLR_PTV_SHIFT (2) /* Pre-scaler shift value */
+
+#define TIMER_CLOCK (V_SCLK / (2 << CONFIG_SYS_PTV))
+
+struct omap_gptimer_regs {
+ unsigned int tidr; /* offset 0x00 */
+ unsigned char res1[12];
+ unsigned int tiocp_cfg; /* offset 0x10 */
+ unsigned char res2[12];
+ unsigned int tier; /* offset 0x20 */
+ unsigned int tistatr; /* offset 0x24 */
+ unsigned int tistat; /* offset 0x28 */
+ unsigned int tisr; /* offset 0x2c */
+ unsigned int tcicr; /* offset 0x30 */
+ unsigned int twer; /* offset 0x34 */
+ unsigned int tclr; /* offset 0x38 */
+ unsigned int tcrr; /* offset 0x3c */
+ unsigned int tldr; /* offset 0x40 */
+ unsigned int ttgr; /* offset 0x44 */
+ unsigned int twpc; /* offset 0x48 */
+ unsigned int tmar; /* offset 0x4c */
+ unsigned int tcar1; /* offset 0x50 */
+ unsigned int tscir; /* offset 0x54 */
+ unsigned int tcar2; /* offset 0x58 */
+};
+
+/* Omap Timer Priv */
+struct omap_timer_priv {
+ struct omap_gptimer_regs *regs;
+};
+
+static int omap_timer_get_count(struct udevice *dev, u64 *count)
+{
+ struct omap_timer_priv *priv = dev_get_priv(dev);
+
+ *count = readl(&priv->regs->tcrr);
+
+ return 0;
+}
+
+static int omap_timer_probe(struct udevice *dev)
+{
+ struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+ struct omap_timer_priv *priv = dev_get_priv(dev);
+
+ uc_priv->clock_rate = TIMER_CLOCK;
+
+ /* start the counter ticking up, reload value on overflow */
+ writel(0, &priv->regs->tldr);
+ /* enable timer */
+ writel((CONFIG_SYS_PTV << 2) | TCLR_PRE_EN | TCLR_AUTO_RELOAD |
+ TCLR_START, &priv->regs->tclr);
+
+ return 0;
+}
+
+static int omap_timer_ofdata_to_platdata(struct udevice *dev)
+{
+ struct omap_timer_priv *priv = dev_get_priv(dev);
+
+ priv->regs = (struct omap_gptimer_regs *)dev_get_addr(dev);
+
+ return 0;
+}
+
+
+static const struct timer_ops omap_timer_ops = {
+ .get_count = omap_timer_get_count,
+};
+
+static const struct udevice_id omap_timer_ids[] = {
+ { .compatible = "ti,am335x-timer" },
+ { .compatible = "ti,am4372-timer" },
+ { .compatible = "ti,omap5430-timer" },
+ {}
+};
+
+U_BOOT_DRIVER(omap_timer) = {
+ .name = "omap_timer",
+ .id = UCLASS_TIMER,
+ .of_match = omap_timer_ids,
+ .ofdata_to_platdata = omap_timer_ofdata_to_platdata,
+ .priv_auto_alloc_size = sizeof(struct omap_timer_priv),
+ .probe = omap_timer_probe,
+ .ops = &omap_timer_ops,
+ .flags = DM_FLAG_PRE_RELOC,
+};
--
2.7.0.rc1.5.gf3adf45
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