diff options
Diffstat (limited to 'sys/powerpc/booke/platform_bare.c')
| -rw-r--r-- | sys/powerpc/booke/platform_bare.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/sys/powerpc/booke/platform_bare.c b/sys/powerpc/booke/platform_bare.c new file mode 100644 index 000000000000..354e834b5c06 --- /dev/null +++ b/sys/powerpc/booke/platform_bare.c @@ -0,0 +1,158 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2008-2012 Semihalf. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/bus.h> +#include <sys/pcpu.h> +#include <sys/proc.h> +#include <sys/smp.h> + +#include <dev/ofw/openfirm.h> + +#include <machine/platform.h> +#include <machine/platformvar.h> + +#include "platform_if.h" + +extern uint32_t *bootinfo; + +static int bare_probe(platform_t); +static void bare_mem_regions(platform_t, struct mem_region *phys, int *physsz, + struct mem_region *avail, int *availsz); +static u_long bare_timebase_freq(platform_t, struct cpuref *cpuref); + +static void bare_reset(platform_t); + +static platform_method_t bare_methods[] = { + PLATFORMMETHOD(platform_probe, bare_probe), + PLATFORMMETHOD(platform_mem_regions, bare_mem_regions), + PLATFORMMETHOD(platform_timebase_freq, bare_timebase_freq), + + PLATFORMMETHOD(platform_reset, bare_reset), + + PLATFORMMETHOD_END +}; + +static platform_def_t bare_platform = { + "bare", + bare_methods, + 0 +}; + +PLATFORM_DEF(bare_platform); + +static int +bare_probe(platform_t plat) +{ + + if (OF_peer(0) == -1) /* Needs device tree to work */ + return (ENXIO); + + return (BUS_PROBE_GENERIC); +} + +void +bare_mem_regions(platform_t plat, struct mem_region *phys, int *physsz, + struct mem_region *avail, int *availsz) +{ + + ofw_mem_regions(phys, physsz, avail, availsz); +} + +static u_long +bare_timebase_freq(platform_t plat, struct cpuref *cpuref) +{ + u_long ticks; + phandle_t cpus, child; + pcell_t freq; + + if (bootinfo != NULL) { + if (bootinfo[0] == 1) { + /* Backward compatibility. See 8-STABLE. */ + ticks = bootinfo[3] >> 3; + } else { + /* Compatibility with Juniper's loader. */ + ticks = bootinfo[5] >> 3; + } + } else + ticks = 0; + + if ((cpus = OF_finddevice("/cpus")) == -1) + goto out; + + if ((child = OF_child(cpus)) == 0) + goto out; + + switch (OF_getproplen(child, "timebase-frequency")) { + case 4: + { + uint32_t tbase; + OF_getprop(child, "timebase-frequency", &tbase, sizeof(tbase)); + ticks = tbase; + return (ticks); + } + case 8: + { + uint64_t tbase; + OF_getprop(child, "timebase-frequency", &tbase, sizeof(tbase)); + ticks = tbase; + return (ticks); + } + default: + break; + } + + freq = 0; + if (OF_getprop(child, "bus-frequency", (void *)&freq, + sizeof(freq)) <= 0) + goto out; + + /* + * Time Base and Decrementer are updated every 8 CCB bus clocks. + * HID0[SEL_TBCLK] = 0 + */ + if (freq != 0) + ticks = freq / 8; + +out: + if (ticks <= 0) + panic("Unable to determine timebase frequency!"); + + return (ticks); +} + +static void +bare_reset(platform_t plat) +{ + + printf("Reset failed...\n"); + while (1) + ; +} |