Add Atmel PIT timer driver, which supports the driver model and device tree.
Signed-off-by: Wenyou Yang wenyou.yang@microchip.com ---
arch/arm/mach-at91/arm926ejs/Makefile | 2 + arch/arm/mach-at91/armv7/Makefile | 2 + drivers/timer/Kconfig | 8 ++++ drivers/timer/Makefile | 1 + drivers/timer/atmel_pit_timer.c | 90 +++++++++++++++++++++++++++++++++++ 5 files changed, 103 insertions(+) create mode 100644 drivers/timer/atmel_pit_timer.c
diff --git a/arch/arm/mach-at91/arm926ejs/Makefile b/arch/arm/mach-at91/arm926ejs/Makefile index 624ccd7c2f..dc935fd9e5 100644 --- a/arch/arm/mach-at91/arm926ejs/Makefile +++ b/arch/arm/mach-at91/arm926ejs/Makefile @@ -22,7 +22,9 @@ obj-y += cache.o obj-y += clock.o obj-y += cpu.o obj-y += reset.o +ifeq ($(CONFIG_ATMEL_PIT_TIMER),) obj-y += timer.o +endif
ifndef CONFIG_SKIP_LOWLEVEL_INIT obj-y += lowlevel_init.o diff --git a/arch/arm/mach-at91/armv7/Makefile b/arch/arm/mach-at91/armv7/Makefile index 9538bc1fad..1ede4cb10a 100644 --- a/arch/arm/mach-at91/armv7/Makefile +++ b/arch/arm/mach-at91/armv7/Makefile @@ -14,4 +14,6 @@ obj-$(CONFIG_SAMA5D4) += sama5d4_devices.o obj-y += clock.o obj-y += cpu.o obj-y += reset.o +ifeq ($(CONFIG_ATMEL_PIT_TIMER),) obj-y += timer.o +endif diff --git a/drivers/timer/Kconfig b/drivers/timer/Kconfig index 17e7dfe245..92c19495d6 100644 --- a/drivers/timer/Kconfig +++ b/drivers/timer/Kconfig @@ -26,6 +26,14 @@ config ALTERA_TIMER Select this to enable a timer for Altera devices. Please find details on the "Embedded Peripherals IP User Guide" of Altera.
+config ATMEL_PIT_TIMER + bool "Atmel periodic interval timer support" + depends on TIMER + help + Select this to enable a periodic interval timer for Atmel devices, + it is designed to offer maximum accuracy and efficient management, + even for systems with long response time. + config SANDBOX_TIMER bool "Sandbox timer support" depends on SANDBOX && TIMER diff --git a/drivers/timer/Makefile b/drivers/timer/Makefile index ced7bd66bd..7db04fcdf8 100644 --- a/drivers/timer/Makefile +++ b/drivers/timer/Makefile @@ -14,3 +14,4 @@ obj-$(CONFIG_STI_TIMER) += sti-timer.o obj-$(CONFIG_ARC_TIMER) += arc_timer.o obj-$(CONFIG_AG101P_TIMER) += ag101p_timer.o obj-$(CONFIG_AE3XX_TIMER) += ae3xx_timer.o +obj-$(CONFIG_ATMEL_PIT_TIMER) += atmel_pit_timer.o diff --git a/drivers/timer/atmel_pit_timer.c b/drivers/timer/atmel_pit_timer.c new file mode 100644 index 0000000000..999717b91f --- /dev/null +++ b/drivers/timer/atmel_pit_timer.c @@ -0,0 +1,90 @@ +/* + * Copyright (C) 2017 Microchip Corporation + * Wenyou.Yang wenyou.yang@microchip.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <clk.h> +#include <dm.h> +#include <timer.h> +#include <asm/io.h> + +#define AT91_PIT_VALUE 0xfffff +#define AT91_PIT_PITEN BIT(24) /* Timer Enabled */ + +struct atmel_pit_regs { + u32 mode; + u32 status; + u32 value; + u32 value_image; +}; + +struct atmel_pit_platdata { + struct atmel_pit_regs *regs; +}; + +static int atmel_pit_get_count(struct udevice *dev, u64 *count) +{ + struct atmel_pit_platdata *plat = dev_get_platdata(dev); + struct atmel_pit_regs *const regs = plat->regs; + u32 val = readl(®s->value_image); + + *count = timer_conv_64(val); + + return 0; +} + +static int atmel_pit_probe(struct udevice *dev) +{ + struct atmel_pit_platdata *plat = dev_get_platdata(dev); + struct atmel_pit_regs *const regs = plat->regs; + struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev); + struct clk clk; + ulong clk_rate; + int ret; + + ret = clk_get_by_index(dev, 0, &clk); + if (ret) + return -EINVAL; + + clk_rate = clk_get_rate(&clk); + if (!clk_rate) + return -EINVAL; + + uc_priv->clock_rate = clk_rate / 16; + + writel(AT91_PIT_VALUE | AT91_PIT_PITEN, ®s->mode); + + return 0; +} + +static int atmel_pit_ofdata_to_platdata(struct udevice *dev) +{ + struct atmel_pit_platdata *plat = dev_get_platdata(dev); + + plat->regs = (struct atmel_pit_regs *)devfdt_get_addr_ptr(dev); + + return 0; +} + +static const struct timer_ops atmel_pit_ops = { + .get_count = atmel_pit_get_count, +}; + +static const struct udevice_id atmel_pit_ids[] = { + { .compatible = "atmel,at91sam9260-pit" }, + { } +}; + +U_BOOT_DRIVER(atmel_pit) = { + .name = "atmel_pit", + .id = UCLASS_TIMER, + .of_match = atmel_pit_ids, + .ofdata_to_platdata = atmel_pit_ofdata_to_platdata, + .platdata_auto_alloc_size = sizeof(struct atmel_pit_platdata), + .probe = atmel_pit_probe, + .ops = &atmel_pit_ops, + .flags = DM_FLAG_PRE_RELOC, +};