diff options
Diffstat (limited to 'drivers/timer')
| -rw-r--r-- | drivers/timer/Kconfig | 12 | ||||
| -rw-r--r-- | drivers/timer/Makefile | 1 | ||||
| -rw-r--r-- | drivers/timer/ast_timer.c | 97 |
3 files changed, 110 insertions, 0 deletions
diff --git a/drivers/timer/Kconfig b/drivers/timer/Kconfig index cb18f12fc9..cd38a6d4bd 100644 --- a/drivers/timer/Kconfig +++ b/drivers/timer/Kconfig @@ -46,4 +46,16 @@ config OMAP_TIMER help Select this to enable an timer for Omap devices. +config AST_TIMER + bool "Aspeed ast2400/ast2500 timer support" + depends on TIMER + default y if ARCH_ASPEED + help + Select this to enable timer for Aspeed ast2400/ast2500 devices. + This is a simple sys timer driver, it is compatible with lib/time.c, + but does not support any interrupts. Even though SoC has 8 hardware + counters, they are all treated as a single device by this driver. + This is mostly because they all share several registers which + makes it difficult to completely separate them. + endmenu diff --git a/drivers/timer/Makefile b/drivers/timer/Makefile index f351fbb4e0..a4b1a486b0 100644 --- a/drivers/timer/Makefile +++ b/drivers/timer/Makefile @@ -9,3 +9,4 @@ 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 +obj-$(CONFIG_AST_TIMER) += ast_timer.o diff --git a/drivers/timer/ast_timer.c b/drivers/timer/ast_timer.c new file mode 100644 index 0000000000..d7c5460cd3 --- /dev/null +++ b/drivers/timer/ast_timer.c @@ -0,0 +1,97 @@ +/* + * Copyright 2016 Google Inc. + * + * 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/timer.h> + +DECLARE_GLOBAL_DATA_PTR; + +#define AST_TICK_TIMER 1 +#define AST_TMC_RELOAD_VAL 0xffffffff + +struct ast_timer_priv { + struct ast_timer *regs; + struct ast_timer_counter *tmc; +}; + +static struct ast_timer_counter *ast_get_timer_counter(struct ast_timer *timer, + int n) +{ + if (n > 3) + return &timer->timers2[n - 4]; + else + return &timer->timers1[n - 1]; +} + +static int ast_timer_probe(struct udevice *dev) +{ + struct ast_timer_priv *priv = dev_get_priv(dev); + struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev); + + writel(AST_TMC_RELOAD_VAL, &priv->tmc->reload_val); + + /* + * Stop the timer. This will also load reload_val into + * the status register. + */ + clrbits_le32(&priv->regs->ctrl1, + AST_TMC_EN << AST_TMC_CTRL1_SHIFT(AST_TICK_TIMER)); + /* Start the timer from the fixed 1MHz clock. */ + setbits_le32(&priv->regs->ctrl1, + (AST_TMC_EN | AST_TMC_1MHZ) << + AST_TMC_CTRL1_SHIFT(AST_TICK_TIMER)); + + uc_priv->clock_rate = AST_TMC_RATE; + + return 0; +} + +static int ast_timer_get_count(struct udevice *dev, u64 *count) +{ + struct ast_timer_priv *priv = dev_get_priv(dev); + + *count = AST_TMC_RELOAD_VAL - readl(&priv->tmc->status); + + return 0; +} + +static int ast_timer_ofdata_to_platdata(struct udevice *dev) +{ + struct ast_timer_priv *priv = dev_get_priv(dev); + + priv->regs = dev_get_addr_ptr(dev); + if (IS_ERR(priv->regs)) + return PTR_ERR(priv->regs); + + priv->tmc = ast_get_timer_counter(priv->regs, AST_TICK_TIMER); + + return 0; +} + +static const struct timer_ops ast_timer_ops = { + .get_count = ast_timer_get_count, +}; + +static const struct udevice_id ast_timer_ids[] = { + { .compatible = "aspeed,ast2500-timer" }, + { .compatible = "aspeed,ast2400-timer" }, + { } +}; + +U_BOOT_DRIVER(ast_timer) = { + .name = "ast_timer", + .id = UCLASS_TIMER, + .of_match = ast_timer_ids, + .probe = ast_timer_probe, + .priv_auto_alloc_size = sizeof(struct ast_timer_priv), + .ofdata_to_platdata = ast_timer_ofdata_to_platdata, + .ops = &ast_timer_ops, + .flags = DM_FLAG_PRE_RELOC, +}; |