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https://github.com/brain-hackers/u-boot-brain
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![Kumar Gala](/assets/img/avatar_default.png)
Added the cpu command that provides a generic mechanism to get status, reset, and release secondary cores in multicore processors. Added support for using the ePAPR defined spin-table mechanism on 85xx. Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
191 lines
4.5 KiB
C
191 lines
4.5 KiB
C
/*
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* Copyright 2008 Freescale Semiconductor.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <asm/processor.h>
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#include <ioports.h>
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#include <asm/io.h>
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#include "mp.h"
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DECLARE_GLOBAL_DATA_PTR;
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#define BOOT_ENTRY_ADDR 0
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#define BOOT_ENTRY_PIR 1
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#define BOOT_ENTRY_R3 2
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#define BOOT_ENTRY_R4 3
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#define BOOT_ENTRY_R6 4
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#define BOOT_ENTRY_R7 5
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#define NUM_BOOT_ENTRY 6
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u32 get_my_id()
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{
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return mfspr(SPRN_PIR);
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}
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int cpu_reset(int nr)
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{
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volatile ccsr_pic_t *pic = (void *)(CFG_MPC85xx_PIC_ADDR);
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out_be32(&pic->pir, 1 << nr);
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(void)in_be32(&pic->pir);
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out_be32(&pic->pir, 0x0);
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return 0;
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}
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int cpu_status(int nr)
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{
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u32 *table, id = get_my_id();
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if (nr == id) {
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table = (u32 *)get_spin_addr();
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printf("table base @ 0x%08x\n", table);
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} else {
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table = (u32 *)get_spin_addr() + nr * NUM_BOOT_ENTRY;
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printf("Running on cpu %d\n", id);
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printf("\n");
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printf("table @ 0x%08x:\n", table);
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printf(" addr - 0x%08x\n", table[BOOT_ENTRY_ADDR]);
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printf(" pir - 0x%08x\n", table[BOOT_ENTRY_PIR]);
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printf(" r3 - 0x%08x\n", table[BOOT_ENTRY_R3]);
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printf(" r4 - 0x%08x\n", table[BOOT_ENTRY_R4]);
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printf(" r6 - 0x%08x\n", table[BOOT_ENTRY_R6]);
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printf(" r7 - 0x%08x\n", table[BOOT_ENTRY_R7]);
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}
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return 0;
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}
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int cpu_release(int nr, unsigned long boot_addr, int argc, char *argv[])
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{
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u32 i, val, *table = (u32 *)get_spin_addr() + nr * NUM_BOOT_ENTRY;
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if (nr == get_my_id()) {
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printf("Invalid to release the boot core.\n\n");
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return 1;
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}
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if (argc != 5) {
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printf("Invalid number of arguments to release.\n\n");
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return 1;
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}
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/* handle pir, r3, r4, r6, r7 */
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for (i = 0; i < 5; i++) {
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if (argv[i][0] != '-') {
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val = simple_strtoul(argv[i], NULL, 16);
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table[i+BOOT_ENTRY_PIR] = val;
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}
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}
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table[BOOT_ENTRY_ADDR] = boot_addr;
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return 0;
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}
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ulong get_spin_addr(void)
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{
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extern ulong __secondary_start_page;
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extern ulong __spin_table;
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ulong addr =
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(ulong)&__spin_table - (ulong)&__secondary_start_page;
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addr += 0xfffff000;
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return addr;
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}
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static void pq3_mp_up(unsigned long bootpg)
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{
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u32 up, cpu_up_mask, whoami;
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u32 *table = (u32 *)get_spin_addr();
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volatile u32 bpcr;
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volatile ccsr_local_ecm_t *ecm = (void *)(CFG_MPC85xx_ECM_ADDR);
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volatile ccsr_gur_t *gur = (void *)(CFG_MPC85xx_GUTS_ADDR);
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volatile ccsr_pic_t *pic = (void *)(CFG_MPC85xx_PIC_ADDR);
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u32 devdisr;
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int timeout = 10;
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whoami = in_be32(&pic->whoami);
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out_be32(&ecm->bptr, 0x80000000 | (bootpg >> 12));
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/* disable time base at the platform */
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devdisr = in_be32(&gur->devdisr);
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if (whoami)
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devdisr |= MPC85xx_DEVDISR_TB0;
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else
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devdisr |= MPC85xx_DEVDISR_TB1;
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out_be32(&gur->devdisr, devdisr);
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/* release the hounds */
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up = ((1 << CONFIG_NR_CPUS) - 1);
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bpcr = in_be32(&ecm->eebpcr);
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bpcr |= (up << 24);
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out_be32(&ecm->eebpcr, bpcr);
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asm("sync; isync; msync");
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cpu_up_mask = 1 << whoami;
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/* wait for everyone */
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while (timeout) {
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int i;
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for (i = 1; i < CONFIG_NR_CPUS; i++) {
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if (table[i * NUM_BOOT_ENTRY])
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cpu_up_mask |= (1 << i);
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};
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if ((cpu_up_mask & up) == up)
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break;
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udelay(100);
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timeout--;
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}
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/* enable time base at the platform */
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if (whoami)
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devdisr |= MPC85xx_DEVDISR_TB1;
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else
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devdisr |= MPC85xx_DEVDISR_TB0;
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out_be32(&gur->devdisr, devdisr);
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mtspr(SPRN_TBWU, 0);
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mtspr(SPRN_TBWL, 0);
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devdisr &= ~(MPC85xx_DEVDISR_TB0 | MPC85xx_DEVDISR_TB1);
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out_be32(&gur->devdisr, devdisr);
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}
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void setup_mp(void)
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{
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extern ulong __secondary_start_page;
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ulong fixup = (ulong)&__secondary_start_page;
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u32 bootpg;
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/* if we have 4G or more of memory, put the boot page at 4Gb-4k */
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if ((u64)gd->ram_size > 0xfffff000)
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bootpg = 0xfffff000;
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else
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bootpg = gd->ram_size - 4096;
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memcpy((void *)bootpg, (void *)fixup, 4096);
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flush_cache(bootpg, 4096);
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pq3_mp_up(bootpg);
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}
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