diff options
| -rw-r--r-- | drivers/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/Makefile | 1 | ||||
| -rw-r--r-- | drivers/timer/Kconfig | 12 | ||||
| -rw-r--r-- | drivers/timer/Makefile | 7 | ||||
| -rw-r--r-- | drivers/timer/timer-uclass.c | 42 | ||||
| -rw-r--r-- | include/asm-generic/global_data.h | 3 | ||||
| -rw-r--r-- | include/dm/uclass-id.h | 1 | ||||
| -rw-r--r-- | include/timer.h | 52 | ||||
| -rw-r--r-- | lib/time.c | 49 |
9 files changed, 169 insertions, 0 deletions
diff --git a/drivers/Kconfig b/drivers/Kconfig index c02f323..ba88b5e 100644 --- a/drivers/Kconfig +++ b/drivers/Kconfig @@ -58,6 +58,8 @@ source "drivers/spi/Kconfig" source "drivers/thermal/Kconfig" +source "drivers/timer/Kconfig" + source "drivers/tpm/Kconfig" source "drivers/usb/Kconfig" diff --git a/drivers/Makefile b/drivers/Makefile index 1a30ad1..4f49bfd 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -48,6 +48,7 @@ obj-y += pcmcia/ obj-y += dfu/ obj-y += rtc/ obj-y += sound/ +obj-y += timer/ obj-y += tpm/ obj-y += twserial/ obj-y += video/ diff --git a/drivers/timer/Kconfig b/drivers/timer/Kconfig new file mode 100644 index 0000000..8e8d600 --- /dev/null +++ b/drivers/timer/Kconfig @@ -0,0 +1,12 @@ +menu "Timer Support" + +config TIMER + bool "Enable Driver Model for Timer drivers" + depends on DM + help + Enable driver model for Timer access. It uses the same API as + lib/time.c. But now implemented by the uclass. The first timer + will be used. The timer is usually a 32 bits free-running up + counter. There may be no real tick, and no timer interrupt. + +endmenu diff --git a/drivers/timer/Makefile b/drivers/timer/Makefile new file mode 100644 index 0000000..afb0009 --- /dev/null +++ b/drivers/timer/Makefile @@ -0,0 +1,7 @@ +# +# Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw> +# +# SPDX-License-Identifier: GPL-2.0+ +# + +obj-$(CONFIG_TIMER) += timer-uclass.o diff --git a/drivers/timer/timer-uclass.c b/drivers/timer/timer-uclass.c new file mode 100644 index 0000000..12aee5b --- /dev/null +++ b/drivers/timer/timer-uclass.c @@ -0,0 +1,42 @@ +/* + * Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <dm.h> +#include <errno.h> +#include <timer.h> + +/* + * Implement a Timer uclass to work with lib/time.c. The timer is usually + * a 32 bits free-running up counter. The get_rate() method is used to get + * the input clock frequency of the timer. The get_count() method is used + * get the current 32 bits count value. If the hardware is counting down, + * the value should be inversed inside the method. There may be no real + * tick, and no timer interrupt. + */ + +int timer_get_count(struct udevice *dev, unsigned long *count) +{ + const struct timer_ops *ops = device_get_ops(dev); + + if (!ops->get_count) + return -ENOSYS; + + return ops->get_count(dev, count); +} + +unsigned long timer_get_rate(struct udevice *dev) +{ + struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev); + + return uc_priv->clock_rate; +} + +UCLASS_DRIVER(timer) = { + .id = UCLASS_TIMER, + .name = "timer", + .per_device_auto_alloc_size = sizeof(struct timer_dev_priv), +}; diff --git a/include/asm-generic/global_data.h b/include/asm-generic/global_data.h index 2155265..d0383f3 100644 --- a/include/asm-generic/global_data.h +++ b/include/asm-generic/global_data.h @@ -69,6 +69,9 @@ typedef struct global_data { struct udevice *dm_root_f; /* Pre-relocation root instance */ struct list_head uclass_root; /* Head of core tree */ #endif +#ifdef CONFIG_TIMER + struct udevice *timer; /* Timer instance for Driver Model */ +#endif const void *fdt_blob; /* Our device tree, NULL if none */ void *new_fdt; /* Relocated FDT */ diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h index da41499..330ecd2 100644 --- a/include/dm/uclass-id.h +++ b/include/dm/uclass-id.h @@ -57,6 +57,7 @@ enum uclass_id { UCLASS_SPI_GENERIC, /* Generic SPI flash target */ UCLASS_SYSCON, /* System configuration device */ UCLASS_THERMAL, /* Thermal sensor */ + UCLASS_TIMER, /* Timer device */ UCLASS_TPM, /* Trusted Platform Module TIS interface */ UCLASS_USB, /* USB bus */ UCLASS_USB_DEV_GENERIC, /* USB generic device */ diff --git a/include/timer.h b/include/timer.h new file mode 100644 index 0000000..cdf385d --- /dev/null +++ b/include/timer.h @@ -0,0 +1,52 @@ +/* + * Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef _TIMER_H_ +#define _TIMER_H_ + +/* + * Get the current timer count + * + * @dev: The Timer device + * @count: pointer that returns the current timer count + * @return: 0 if OK, -ve on error + */ +int timer_get_count(struct udevice *dev, unsigned long *count); +/* + * Get the timer input clock frequency + * + * @dev: The Timer device + * @return: the timer input clock frequency + */ +unsigned long timer_get_rate(struct udevice *dev); + +/* + * struct timer_ops - Driver model Timer operations + * + * The uclass interface is implemented by all Timer devices which use + * driver model. + */ +struct timer_ops { + /* + * Get the current timer count + * + * @dev: The Timer device + * @count: pointer that returns the current timer count + * @return: 0 if OK, -ve on error + */ + int (*get_count)(struct udevice *dev, unsigned long *count); +}; + +/* + * struct timer_dev_priv - information about a device used by the uclass + * + * @clock_rate: the timer input clock frequency + */ +struct timer_dev_priv { + unsigned long clock_rate; +}; + +#endif /* _TIMER_H_ */ @@ -6,6 +6,9 @@ */ #include <common.h> +#include <dm.h> +#include <errno.h> +#include <timer.h> #include <watchdog.h> #include <div64.h> #include <asm/io.h> @@ -37,6 +40,52 @@ unsigned long notrace timer_read_counter(void) extern unsigned long __weak timer_read_counter(void); #endif +#ifdef CONFIG_TIMER +static int notrace dm_timer_init(void) +{ + struct udevice *dev; + int ret; + + if (!gd->timer) { + ret = uclass_first_device(UCLASS_TIMER, &dev); + if (ret) + return ret; + if (!dev) + return -ENODEV; + gd->timer = dev; + } + + return 0; +} + +ulong notrace get_tbclk(void) +{ + int ret; + + ret = dm_timer_init(); + if (ret) + return ret; + + return timer_get_rate(gd->timer); +} + +unsigned long notrace timer_read_counter(void) +{ + unsigned long count; + int ret; + + ret = dm_timer_init(); + if (ret) + return ret; + + ret = timer_get_count(gd->timer, &count); + if (ret) + return ret; + + return count; +} +#endif /* CONFIG_TIMER */ + uint64_t __weak notrace get_ticks(void) { unsigned long now = timer_read_counter(); |