From 5764acb2617658af76c25285685e791ce6d0b051 Mon Sep 17 00:00:00 2001 From: Bin Meng Date: Wed, 21 Jun 2023 23:11:44 +0800 Subject: riscv: timer: Update the sifive clint timer driver to support aclint This RISC-V ACLINT specification [1] defines a set of memory mapped devices which provide inter-processor interrupts (IPI) and timer functionalities for each HART on a multi-HART RISC-V platform. The RISC-V ACLINT specification is defined to be backward compatible with the SiFive CLINT specification, however the device tree binding is a new one. This change updates the sifive clint timer driver to support ACLINT mtimer device, using a per-driver data field to hold the mtimer offset to the base address encoded in the mtimer node. [1] https://github.com/riscv/riscv-aclint/blob/main/riscv-aclint.adoc Signed-off-by: Bin Meng Reviewed-by: Rick Chen --- drivers/timer/sifive_clint_timer.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) (limited to 'drivers/timer/sifive_clint_timer.c') diff --git a/drivers/timer/sifive_clint_timer.c b/drivers/timer/sifive_clint_timer.c index 939b99d937..be45f17ddf 100644 --- a/drivers/timer/sifive_clint_timer.c +++ b/drivers/timer/sifive_clint_timer.c @@ -12,12 +12,16 @@ #include #include +#define CLINT_MTIME_OFFSET 0xbff8 +#define ACLINT_MTIME_OFFSET 0 + /* mtime register */ -#define MTIME_REG(base) ((ulong)(base) + 0xbff8) +#define MTIME_REG(base, offset) ((ulong)(base) + (offset)) static u64 notrace sifive_clint_get_count(struct udevice *dev) { - return readq((void __iomem *)MTIME_REG(dev_get_priv(dev))); + return readq((void __iomem *)MTIME_REG(dev_get_priv(dev), + dev_get_driver_data(dev))); } #if CONFIG_IS_ENABLED(RISCV_MMODE) && IS_ENABLED(CONFIG_TIMER_EARLY) @@ -35,7 +39,8 @@ unsigned long notrace timer_early_get_rate(void) */ u64 notrace timer_early_get_count(void) { - return readq((void __iomem *)MTIME_REG(RISCV_MMODE_TIMERBASE)); + return readq((void __iomem *)MTIME_REG(RISCV_MMODE_TIMERBASE, + RISCV_MMODE_TIMEROFF)); } #endif @@ -53,8 +58,9 @@ static int sifive_clint_probe(struct udevice *dev) } static const struct udevice_id sifive_clint_ids[] = { - { .compatible = "riscv,clint0" }, - { .compatible = "sifive,clint0" }, + { .compatible = "riscv,clint0", .data = CLINT_MTIME_OFFSET }, + { .compatible = "sifive,clint0", .data = CLINT_MTIME_OFFSET }, + { .compatible = "riscv,aclint-mtimer", .data = ACLINT_MTIME_OFFSET }, { } }; -- cgit v1.2.3