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freebsd/sys/powerpc/booke/platform_bare.c
Marcel Moolenaar e3d4100642 Support booting non FDT-capable loaders: 
1.  Allow embedding the FDT into the kernel, just like PowerPC/book-E.
2.  If the loader passes us a pointer to the bootinfo structure, save
    it and use it to fill in the gaps (e.g. bus frequencies, etc).
2011-01-17 23:54:50 +00:00

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/*-
* Copyright (c) 2008-2009 Semihalf, Rafal Jaworowski
* 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/cdefs.h>
__FBSDID("$FreeBSD$");
#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 <machine/bus.h>
#include <machine/cpu.h>
#include <machine/hid.h>
#include <machine/platform.h>
#include <machine/platformvar.h>
#include <machine/smp.h>
#include <machine/spr.h>
#include <machine/vmparam.h>
#include <dev/fdt/fdt_common.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <dev/ofw/openfirm.h>
#include <powerpc/mpc85xx/mpc85xx.h>
#include "platform_if.h"
#ifdef SMP
extern void *ap_pcpu;
extern uint8_t __boot_page[]; /* Boot page body */
extern uint32_t kernload; /* Kernel physical load address */
#endif
extern uint32_t *bootinfo;
static int cpu, maxcpu;
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 int bare_smp_first_cpu(platform_t, struct cpuref *cpuref);
static int bare_smp_next_cpu(platform_t, struct cpuref *cpuref);
static int bare_smp_get_bsp(platform_t, struct cpuref *cpuref);
static int bare_smp_start_cpu(platform_t, struct pcpu *cpu);
static void e500_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_smp_first_cpu, bare_smp_first_cpu),
PLATFORMMETHOD(platform_smp_next_cpu, bare_smp_next_cpu),
PLATFORMMETHOD(platform_smp_get_bsp, bare_smp_get_bsp),
PLATFORMMETHOD(platform_smp_start_cpu, bare_smp_start_cpu),
PLATFORMMETHOD(platform_reset, e500_reset),
{ 0, 0 }
};
static platform_def_t bare_platform = {
"bare metal",
bare_methods,
0
};
PLATFORM_DEF(bare_platform);
static int
bare_probe(platform_t plat)
{
uint32_t ver, sr;
int i, law_max, tgt;
ver = SVR_VER(mfspr(SPR_SVR));
if (ver == SVR_MPC8572E || ver == SVR_MPC8572)
maxcpu = 2;
else
maxcpu = 1;
/*
* Clear local access windows. Skip DRAM entries, so we don't shoot
* ourselves in the foot.
*/
law_max = law_getmax();
for (i = 0; i < law_max; i++) {
sr = ccsr_read4(OCP85XX_LAWSR(i));
if ((sr & 0x80000000) == 0)
continue;
tgt = (sr & 0x01f00000) >> 20;
if (tgt == OCP85XX_TGTIF_RAM1 || tgt == OCP85XX_TGTIF_RAM2 ||
tgt == OCP85XX_TGTIF_RAM_INTL)
continue;
ccsr_write4(OCP85XX_LAWSR(i), sr & 0x7fffffff);
}
return (BUS_PROBE_GENERIC);
}
#define MEM_REGIONS 8
static struct mem_region avail_regions[MEM_REGIONS];
void
bare_mem_regions(platform_t plat, struct mem_region **phys, int *physsz,
struct mem_region **avail, int *availsz)
{
uint32_t memsize;
int i, rv;
rv = fdt_get_mem_regions(avail_regions, availsz, &memsize);
if (rv != 0)
return;
for (i = 0; i < *availsz; i++) {
if (avail_regions[i].mr_start < 1048576) {
avail_regions[i].mr_size =
avail_regions[i].mr_size -
(1048576 - avail_regions[i].mr_start);
avail_regions[i].mr_start = 1048576;
}
}
*avail = avail_regions;
/* On the bare metal platform phys == avail memory */
*physsz = *availsz;
*phys = *avail;
}
static u_long
bare_timebase_freq(platform_t plat, struct cpuref *cpuref)
{
u_long ticks;
phandle_t cpus, child;
pcell_t freq;
/* Backward compatibility. See 8-STABLE. */
ticks = bootinfo[3] >> 3;
if ((cpus = OF_finddevice("/cpus")) == 0)
goto out;
if ((child = OF_child(cpus)) == 0)
goto out;
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 int
bare_smp_first_cpu(platform_t plat, struct cpuref *cpuref)
{
cpu = 0;
cpuref->cr_cpuid = cpu;
cpuref->cr_hwref = cpuref->cr_cpuid;
if (bootverbose)
printf("powerpc_smp_first_cpu: cpuid %d\n", cpuref->cr_cpuid);
cpu++;
return (0);
}
static int
bare_smp_next_cpu(platform_t plat, struct cpuref *cpuref)
{
if (cpu >= maxcpu)
return (ENOENT);
cpuref->cr_cpuid = cpu++;
cpuref->cr_hwref = cpuref->cr_cpuid;
if (bootverbose)
printf("powerpc_smp_next_cpu: cpuid %d\n", cpuref->cr_cpuid);
return (0);
}
static int
bare_smp_get_bsp(platform_t plat, struct cpuref *cpuref)
{
cpuref->cr_cpuid = mfspr(SPR_PIR);
cpuref->cr_hwref = cpuref->cr_cpuid;
return (0);
}
static int
bare_smp_start_cpu(platform_t plat, struct pcpu *pc)
{
#ifdef SMP
uint32_t bptr, eebpcr;
int timeout;
eebpcr = ccsr_read4(OCP85XX_EEBPCR);
if ((eebpcr & (pc->pc_cpumask << 24)) != 0) {
printf("%s: CPU=%d already out of hold-off state!\n",
__func__, pc->pc_cpuid);
return (ENXIO);
}
ap_pcpu = pc;
__asm __volatile("msync; isync");
/*
* Set BPTR to the physical address of the boot page
*/
bptr = ((uint32_t)__boot_page - KERNBASE) + kernload;
ccsr_write4(OCP85XX_BPTR, (bptr >> 12) | 0x80000000);
/*
* Release AP from hold-off state
*/
eebpcr |= (pc->pc_cpumask << 24);
ccsr_write4(OCP85XX_EEBPCR, eebpcr);
__asm __volatile("isync; msync");
timeout = 500;
while (!pc->pc_awake && timeout--)
DELAY(1000); /* wait 1ms */
return ((pc->pc_awake) ? 0 : EBUSY);
#else
/* No SMP support */
return (ENXIO);
#endif
}
static void
e500_reset(platform_t plat)
{
uint32_t ver = SVR_VER(mfspr(SPR_SVR));
if (ver == SVR_MPC8572E || ver == SVR_MPC8572 ||
ver == SVR_MPC8548E || ver == SVR_MPC8548)
/* Systems with dedicated reset register */
ccsr_write4(OCP85XX_RSTCR, 2);
else {
/* Clear DBCR0, disables debug interrupts and events. */
mtspr(SPR_DBCR0, 0);
__asm __volatile("isync");
/* Enable Debug Interrupts in MSR. */
mtmsr(mfmsr() | PSL_DE);
/* Enable debug interrupts and issue reset. */
mtspr(SPR_DBCR0, mfspr(SPR_DBCR0) | DBCR0_IDM |
DBCR0_RST_SYSTEM);
}
printf("Reset failed...\n");
while (1);
}
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