u-boot/arch/powerpc/cpu/mpc85xx/mp.c
Aaron Sierra 9d64c6bb4a 85xx: Add support for not releasing secondary cores via 'mp_holdoff'
Some OSes require that secondary cores not be initialized when they
are booted (eg VxWorks).  By default when U-Boot is compiled with the
CONFIG_MP option all secondary cores are brought out of reset and held
in spinloops.  Setting the "mp_holdoff" environment variable to 'yes'
or '1' will cause U-Boot to leave secondary cores in their default
state.

Signed-off-by: Aaron Sierra <asierra@xes-inc.com>
Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2010-10-20 02:38:40 -05:00

409 lines
9.8 KiB
C

/*
* Copyright 2008-2010 Freescale Semiconductor, Inc.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <asm/processor.h>
#include <ioports.h>
#include <lmb.h>
#include <asm/io.h>
#include <asm/mmu.h>
#include <asm/fsl_law.h>
#include "mp.h"
DECLARE_GLOBAL_DATA_PTR;
u32 get_my_id()
{
return mfspr(SPRN_PIR);
}
/*
* Determine if U-Boot should keep secondary cores in reset, or let them out
* of reset and hold them in a spinloop
*/
int hold_cores_in_reset(int verbose)
{
const char *s = getenv("mp_holdoff");
/* Default to no, overriden by 'y', 'yes', 'Y', 'Yes', or '1' */
if (s && (*s == 'y' || *s == 'Y' || *s == '1')) {
if (verbose) {
puts("Secondary cores are being held in reset.\n");
puts("See 'mp_holdoff' environment variable\n");
}
return 1;
}
return 0;
}
int cpu_reset(int nr)
{
volatile ccsr_pic_t *pic = (void *)(CONFIG_SYS_MPC8xxx_PIC_ADDR);
out_be32(&pic->pir, 1 << nr);
/* the dummy read works around an errata on early 85xx MP PICs */
(void)in_be32(&pic->pir);
out_be32(&pic->pir, 0x0);
return 0;
}
int cpu_status(int nr)
{
u32 *table, id = get_my_id();
if (hold_cores_in_reset(1))
return 0;
if (nr == id) {
table = (u32 *)get_spin_virt_addr();
printf("table base @ 0x%p\n", table);
} else {
table = (u32 *)get_spin_virt_addr() + nr * NUM_BOOT_ENTRY;
printf("Running on cpu %d\n", id);
printf("\n");
printf("table @ 0x%p\n", table);
printf(" addr - 0x%08x\n", table[BOOT_ENTRY_ADDR_LOWER]);
printf(" pir - 0x%08x\n", table[BOOT_ENTRY_PIR]);
printf(" r3 - 0x%08x\n", table[BOOT_ENTRY_R3_LOWER]);
printf(" r6 - 0x%08x\n", table[BOOT_ENTRY_R6_LOWER]);
}
return 0;
}
#ifdef CONFIG_FSL_CORENET
int cpu_disable(int nr)
{
volatile ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
setbits_be32(&gur->coredisrl, 1 << nr);
return 0;
}
int is_core_disabled(int nr) {
ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
u32 coredisrl = in_be32(&gur->coredisrl);
return (coredisrl & (1 << nr));
}
#else
int cpu_disable(int nr)
{
volatile ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
switch (nr) {
case 0:
setbits_be32(&gur->devdisr, MPC85xx_DEVDISR_CPU0);
break;
case 1:
setbits_be32(&gur->devdisr, MPC85xx_DEVDISR_CPU1);
break;
default:
printf("Invalid cpu number for disable %d\n", nr);
return 1;
}
return 0;
}
int is_core_disabled(int nr) {
ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
u32 devdisr = in_be32(&gur->devdisr);
switch (nr) {
case 0:
return (devdisr & MPC85xx_DEVDISR_CPU0);
case 1:
return (devdisr & MPC85xx_DEVDISR_CPU1);
default:
printf("Invalid cpu number for disable %d\n", nr);
}
return 0;
}
#endif
static u8 boot_entry_map[4] = {
0,
BOOT_ENTRY_PIR,
BOOT_ENTRY_R3_LOWER,
BOOT_ENTRY_R6_LOWER,
};
int cpu_release(int nr, int argc, char * const argv[])
{
u32 i, val, *table = (u32 *)get_spin_virt_addr() + nr * NUM_BOOT_ENTRY;
u64 boot_addr;
if (hold_cores_in_reset(1))
return 0;
if (nr == get_my_id()) {
printf("Invalid to release the boot core.\n\n");
return 1;
}
if (argc != 4) {
printf("Invalid number of arguments to release.\n\n");
return 1;
}
boot_addr = simple_strtoull(argv[0], NULL, 16);
/* handle pir, r3, r6 */
for (i = 1; i < 4; i++) {
if (argv[i][0] != '-') {
u8 entry = boot_entry_map[i];
val = simple_strtoul(argv[i], NULL, 16);
table[entry] = val;
}
}
table[BOOT_ENTRY_ADDR_UPPER] = (u32)(boot_addr >> 32);
/* ensure all table updates complete before final address write */
eieio();
table[BOOT_ENTRY_ADDR_LOWER] = (u32)(boot_addr & 0xffffffff);
return 0;
}
u32 determine_mp_bootpg(void)
{
/* if we have 4G or more of memory, put the boot page at 4Gb-4k */
if ((u64)gd->ram_size > 0xfffff000)
return (0xfffff000);
return (gd->ram_size - 4096);
}
ulong get_spin_phys_addr(void)
{
extern ulong __secondary_start_page;
extern ulong __spin_table;
return (determine_mp_bootpg() +
(ulong)&__spin_table - (ulong)&__secondary_start_page);
}
ulong get_spin_virt_addr(void)
{
extern ulong __secondary_start_page;
extern ulong __spin_table;
return (CONFIG_BPTR_VIRT_ADDR +
(ulong)&__spin_table - (ulong)&__secondary_start_page);
}
#ifdef CONFIG_FSL_CORENET
static void plat_mp_up(unsigned long bootpg)
{
u32 up, cpu_up_mask, whoami;
u32 *table = (u32 *)get_spin_virt_addr();
volatile ccsr_gur_t *gur;
volatile ccsr_local_t *ccm;
volatile ccsr_rcpm_t *rcpm;
volatile ccsr_pic_t *pic;
int timeout = 10;
u32 nr_cpus;
struct law_entry e;
gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
ccm = (void *)(CONFIG_SYS_FSL_CORENET_CCM_ADDR);
rcpm = (void *)(CONFIG_SYS_FSL_CORENET_RCPM_ADDR);
pic = (void *)(CONFIG_SYS_MPC8xxx_PIC_ADDR);
nr_cpus = ((in_be32(&pic->frr) >> 8) & 0xff) + 1;
whoami = in_be32(&pic->whoami);
cpu_up_mask = 1 << whoami;
out_be32(&ccm->bstrl, bootpg);
e = find_law(bootpg);
out_be32(&ccm->bstrar, LAW_EN | e.trgt_id << 20 | LAW_SIZE_4K);
/* readback to sync write */
in_be32(&ccm->bstrar);
/* disable time base at the platform */
out_be32(&rcpm->ctbenrl, cpu_up_mask);
/* release the hounds */
up = ((1 << nr_cpus) - 1);
out_be32(&gur->brrl, up);
/* wait for everyone */
while (timeout) {
int i;
for (i = 0; i < nr_cpus; i++) {
if (table[i * NUM_BOOT_ENTRY + BOOT_ENTRY_ADDR_LOWER])
cpu_up_mask |= (1 << i);
};
if ((cpu_up_mask & up) == up)
break;
udelay(100);
timeout--;
}
if (timeout == 0)
printf("CPU up timeout. CPU up mask is %x should be %x\n",
cpu_up_mask, up);
/* enable time base at the platform */
out_be32(&rcpm->ctbenrl, 0);
mtspr(SPRN_TBWU, 0);
mtspr(SPRN_TBWL, 0);
out_be32(&rcpm->ctbenrl, (1 << nr_cpus) - 1);
#ifdef CONFIG_MPC8xxx_DISABLE_BPTR
/*
* Disabling Boot Page Translation allows the memory region 0xfffff000
* to 0xffffffff to be used normally. Leaving Boot Page Translation
* enabled remaps 0xfffff000 to SDRAM which makes that memory region
* unusable for normal operation but it does allow OSes to easily
* reset a processor core to put it back into U-Boot's spinloop.
*/
clrbits_be32(&ecm->bptr, 0x80000000);
#endif
}
#else
static void plat_mp_up(unsigned long bootpg)
{
u32 up, cpu_up_mask, whoami;
u32 *table = (u32 *)get_spin_virt_addr();
volatile u32 bpcr;
volatile ccsr_local_ecm_t *ecm = (void *)(CONFIG_SYS_MPC85xx_ECM_ADDR);
volatile ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
volatile ccsr_pic_t *pic = (void *)(CONFIG_SYS_MPC8xxx_PIC_ADDR);
u32 devdisr;
int timeout = 10;
whoami = in_be32(&pic->whoami);
out_be32(&ecm->bptr, 0x80000000 | (bootpg >> 12));
/* disable time base at the platform */
devdisr = in_be32(&gur->devdisr);
if (whoami)
devdisr |= MPC85xx_DEVDISR_TB0;
else
devdisr |= MPC85xx_DEVDISR_TB1;
out_be32(&gur->devdisr, devdisr);
/* release the hounds */
up = ((1 << cpu_numcores()) - 1);
bpcr = in_be32(&ecm->eebpcr);
bpcr |= (up << 24);
out_be32(&ecm->eebpcr, bpcr);
asm("sync; isync; msync");
cpu_up_mask = 1 << whoami;
/* wait for everyone */
while (timeout) {
int i;
for (i = 0; i < cpu_numcores(); i++) {
if (table[i * NUM_BOOT_ENTRY + BOOT_ENTRY_ADDR_LOWER])
cpu_up_mask |= (1 << i);
};
if ((cpu_up_mask & up) == up)
break;
udelay(100);
timeout--;
}
if (timeout == 0)
printf("CPU up timeout. CPU up mask is %x should be %x\n",
cpu_up_mask, up);
/* enable time base at the platform */
if (whoami)
devdisr |= MPC85xx_DEVDISR_TB1;
else
devdisr |= MPC85xx_DEVDISR_TB0;
out_be32(&gur->devdisr, devdisr);
mtspr(SPRN_TBWU, 0);
mtspr(SPRN_TBWL, 0);
devdisr &= ~(MPC85xx_DEVDISR_TB0 | MPC85xx_DEVDISR_TB1);
out_be32(&gur->devdisr, devdisr);
#ifdef CONFIG_MPC8xxx_DISABLE_BPTR
/*
* Disabling Boot Page Translation allows the memory region 0xfffff000
* to 0xffffffff to be used normally. Leaving Boot Page Translation
* enabled remaps 0xfffff000 to SDRAM which makes that memory region
* unusable for normal operation but it does allow OSes to easily
* reset a processor core to put it back into U-Boot's spinloop.
*/
clrbits_be32(&ecm->bptr, 0x80000000);
#endif
}
#endif
void cpu_mp_lmb_reserve(struct lmb *lmb)
{
u32 bootpg = determine_mp_bootpg();
lmb_reserve(lmb, bootpg, 4096);
}
void setup_mp(void)
{
extern ulong __secondary_start_page;
extern ulong __bootpg_addr;
ulong fixup = (ulong)&__secondary_start_page;
u32 bootpg = determine_mp_bootpg();
/* Some OSes expect secondary cores to be held in reset */
if (hold_cores_in_reset(0))
return;
/* Store the bootpg's SDRAM address for use by secondary CPU cores */
__bootpg_addr = bootpg;
/* look for the tlb covering the reset page, there better be one */
int i = find_tlb_idx((void *)CONFIG_BPTR_VIRT_ADDR, 1);
/* we found a match */
if (i != -1) {
/* map reset page to bootpg so we can copy code there */
disable_tlb(i);
set_tlb(1, CONFIG_BPTR_VIRT_ADDR, bootpg, /* tlb, epn, rpn */
MAS3_SX|MAS3_SW|MAS3_SR, MAS2_I|MAS2_G, /* perms, wimge */
0, i, BOOKE_PAGESZ_4K, 1); /* ts, esel, tsize, iprot */
memcpy((void *)CONFIG_BPTR_VIRT_ADDR, (void *)fixup, 4096);
plat_mp_up(bootpg);
} else {
puts("WARNING: No reset page TLB. "
"Skipping secondary core setup\n");
}
}