Adding a timer driver for omap devices based on driver model and device tree.
Signed-off-by: Mugunthan V N mugunthanvnm@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, +};