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author | Ruslan Bukin <br@FreeBSD.org> | 2019-03-27 16:26:03 +0000 |
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committer | Ruslan Bukin <br@FreeBSD.org> | 2019-03-27 16:26:03 +0000 |
commit | 61fef9e8601a39e6d7dca611a7bba9b60bf327d7 (patch) | |
tree | 57803b6608782f19d7be183e4087370513f73966 /sys/riscv | |
parent | 77c2fe20df6a9a7c1a353e1a4ab2ba80fefab881 (diff) | |
download | src-61fef9e8601a39e6d7dca611a7bba9b60bf327d7.tar.gz src-61fef9e8601a39e6d7dca611a7bba9b60bf327d7.zip |
Grab timer frequency from FDT.
RISC-V timer has no dedicated DTS node and we have to get timer
frequency from cpus node.
Tested on Government Furnished Equipment (GFE) cores synthesized
on Xilinx VCU118.
Reviewed by: markj
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D19727
Notes
Notes:
svn path=/head/; revision=345581
Diffstat (limited to 'sys/riscv')
-rw-r--r-- | sys/riscv/riscv/timer.c | 36 |
1 files changed, 32 insertions, 4 deletions
diff --git a/sys/riscv/riscv/timer.c b/sys/riscv/riscv/timer.c index 93d0cefbc3a5..5ee5ca221584 100644 --- a/sys/riscv/riscv/timer.c +++ b/sys/riscv/riscv/timer.c @@ -61,7 +61,10 @@ __FBSDID("$FreeBSD$"); #include <machine/trap.h> #include <machine/sbi.h> -#define DEFAULT_FREQ 10000000 +#include <dev/fdt/fdt_common.h> +#include <dev/ofw/ofw_bus.h> +#include <dev/ofw/ofw_bus_subr.h> +#include <dev/ofw/openfirm.h> #define TIMER_COUNTS 0x00 #define TIMER_MTIMECMP(cpu) (cpu * 8) @@ -157,6 +160,32 @@ riscv_timer_intr(void *arg) } static int +riscv_timer_get_timebase(device_t dev, uint32_t *freq) +{ + phandle_t node; + int len; + + node = OF_finddevice("/cpus"); + if (node == -1) { + if (bootverbose) + device_printf(dev, "Can't find cpus node.\n"); + return (ENXIO); + } + + len = OF_getproplen(node, "timebase-frequency"); + if (len != 4) { + if (bootverbose) + device_printf(dev, + "Can't find timebase-frequency property.\n"); + return (ENXIO); + } + + OF_getencprop(node, "timebase-frequency", freq, len); + + return (0); +} + +static int riscv_timer_probe(device_t dev) { @@ -176,10 +205,9 @@ riscv_timer_attach(device_t dev) return (ENXIO); if (device_get_unit(dev) != 0) - return ENXIO; + return (ENXIO); - sc->clkfreq = DEFAULT_FREQ; - if (sc->clkfreq == 0) { + if (riscv_timer_get_timebase(dev, &sc->clkfreq) != 0) { device_printf(dev, "No clock frequency specified\n"); return (ENXIO); } |