drivers: timer: omap_timer: add timer driver for omap devices based on dm

Adding a timer driver for omap devices based on driver model
and device tree.

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>

diff --git a/drivers/timer/Kconfig b/drivers/timer/Kconfig
index 2b10d2b..ff65a73 100644 (file)
--- 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 (file)
--- 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 (file)
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,
+};