1 files changed, 488 insertions, 0 deletions
diff --git a/arch/powerpc/cpu/mpc85xx/mp.c b/arch/powerpc/cpu/mpc85xx/mp.c
new file mode 100644
index 0000000..861c8e0
--- /dev/null
+++ b/arch/powerpc/cpu/mpc85xx/mp.c
@@ -0,0 +1,488 @@
+/*
+ * Copyright 2008-2011 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 <asm/fsl_ddr_sdram.h>
+#include "mp.h"
+
+DECLARE_GLOBAL_DATA_PTR;
+u32 fsl_ddr_get_intl3r(void);
+
+extern u32 __spin_table[];
+
+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)
+{
+	/* Default to no, overriden by 'y', 'yes', 'Y', 'Yes', or '1' */
+	if (getenv_yesno("mp_holdoff") == 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 *)&__spin_table;
+		printf("table base @ 0x%p\n", table);
+	} else if (is_core_disabled(nr)) {
+		puts("Disabled\n");
+	} else {
+		table = (u32 *)&__spin_table + 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("   r3   - 0x%08x\n", table[BOOT_ENTRY_R3_LOWER]);
+		printf("   pir  - 0x%08x\n", table[BOOT_ENTRY_PIR]);
+	}
+
+	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,
+};
+
+int cpu_release(int nr, int argc, char * const argv[])
+{
+	u32 i, val, *table = (u32 *)&__spin_table + 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 */
+	for (i = 1; i < 3; 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(unsigned int *pagesize)
+{
+	u32 bootpg;
+#ifdef CONFIG_SYS_FSL_ERRATUM_A004468
+	u32 svr = get_svr();
+	u32 granule_size, check;
+	struct law_entry e;
+#endif
+
+
+	/* use last 4K of mapped memory */
+	bootpg = ((gd->ram_size > CONFIG_MAX_MEM_MAPPED) ?
+		CONFIG_MAX_MEM_MAPPED : gd->ram_size) +
+		CONFIG_SYS_SDRAM_BASE - 4096;
+	if (pagesize)
+		*pagesize = 4096;
+
+#ifdef CONFIG_SYS_FSL_ERRATUM_A004468
+/*
+ * Erratum A004468 has two parts. The 3-way interleaving applies to T4240,
+ * to be fixed in rev 2.0. The 2-way interleaving applies to many SoCs. But
+ * the way boot page chosen in u-boot avoids hitting this erratum. So only
+ * thw workaround for 3-way interleaving is needed.
+ *
+ * To make sure boot page translation works with 3-Way DDR interleaving
+ * enforce a check for the following constrains
+ * 8K granule size requires BRSIZE=8K and
+ *    bootpg >> log2(BRSIZE) %3 == 1
+ * 4K and 1K granule size requires BRSIZE=4K and
+ *    bootpg >> log2(BRSIZE) %3 == 0
+ */
+	if (SVR_SOC_VER(svr) == SVR_T4240 && SVR_MAJ(svr) < 2) {
+		e = find_law(bootpg);
+		switch (e.trgt_id) {
+		case LAW_TRGT_IF_DDR_INTLV_123:
+			granule_size = fsl_ddr_get_intl3r() & 0x1f;
+			if (granule_size == FSL_DDR_3WAY_8KB_INTERLEAVING) {
+				if (pagesize)
+					*pagesize = 8192;
+				bootpg &= 0xffffe000;	/* align to 8KB */
+				check = bootpg >> 13;
+				while ((check % 3) != 1)
+					check--;
+				bootpg = check << 13;
+				debug("Boot page (8K) at 0x%08x\n", bootpg);
+				break;
+			} else {
+				bootpg &= 0xfffff000;	/* align to 4KB */
+				check = bootpg >> 12;
+				while ((check % 3) != 0)
+					check--;
+				bootpg = check << 12;
+				debug("Boot page (4K) at 0x%08x\n", bootpg);
+			}
+				break;
+		default:
+			break;
+		}
+	}
+#endif /* CONFIG_SYS_FSL_ERRATUM_A004468 */
+
+	return bootpg;
+}
+
+phys_addr_t get_spin_phys_addr(void)
+{
+	return virt_to_phys(&__spin_table);
+}
+
+#ifdef CONFIG_FSL_CORENET
+static void plat_mp_up(unsigned long bootpg, unsigned int pagesize)
+{
+	u32 cpu_up_mask, whoami, brsize = LAW_SIZE_4K;
+	u32 *table = (u32 *)&__spin_table;
+	volatile ccsr_gur_t *gur;
+	volatile ccsr_local_t *ccm;
+	volatile ccsr_rcpm_t *rcpm;
+	volatile ccsr_pic_t *pic;
+	int timeout = 10;
+	u32 mask = cpu_mask();
+	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);
+
+	whoami = in_be32(&pic->whoami);
+	cpu_up_mask = 1 << whoami;
+	out_be32(&ccm->bstrl, bootpg);
+
+	e = find_law(bootpg);
+	/* pagesize is only 4K or 8K */
+	if (pagesize == 8192)
+		brsize = LAW_SIZE_8K;
+	out_be32(&ccm->bstrar, LAW_EN | e.trgt_id << 20 | brsize);
+	debug("BRSIZE is 0x%x\n", brsize);
+
+	/* readback to sync write */
+	in_be32(&ccm->bstrar);
+
+	/* disable time base at the platform */
+	out_be32(&rcpm->ctbenrl, cpu_up_mask);
+
+	out_be32(&gur->brrl, mask);
+
+	/* wait for everyone */
+	while (timeout) {
+		unsigned int i, cpu, nr_cpus = cpu_numcores();
+
+		for_each_cpu(i, cpu, nr_cpus, mask) {
+			if (table[cpu * NUM_BOOT_ENTRY + BOOT_ENTRY_ADDR_LOWER])
+				cpu_up_mask |= (1 << cpu);
+		}
+
+		if ((cpu_up_mask & mask) == mask)
+			break;
+
+		udelay(100);
+		timeout--;
+	}
+
+	if (timeout == 0)
+		printf("CPU up timeout. CPU up mask is %x should be %x\n",
+			cpu_up_mask, mask);
+
+	/* enable time base at the platform */
+	out_be32(&rcpm->ctbenrl, 0);
+
+	/* readback to sync write */
+	in_be32(&rcpm->ctbenrl);
+
+	mtspr(SPRN_TBWU, 0);
+	mtspr(SPRN_TBWL, 0);
+
+	out_be32(&rcpm->ctbenrl, mask);
+
+#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(&ccm->bstrar, LAW_EN);
+#endif
+}
+#else
+static void plat_mp_up(unsigned long bootpg, unsigned int pagesize)
+{
+	u32 up, cpu_up_mask, whoami;
+	u32 *table = (u32 *)&__spin_table;
+	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);
+
+	/* readback to sync write */
+	in_be32(&gur->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(NULL);
+
+	lmb_reserve(lmb, bootpg, 4096);
+}
+
+void setup_mp(void)
+{
+	extern u32 __secondary_start_page;
+	extern u32 __bootpg_addr, __spin_table_addr, __second_half_boot_page;
+
+	int i;
+	ulong fixup = (u32)&__secondary_start_page;
+	u32 bootpg, bootpg_map, pagesize;
+
+	bootpg = determine_mp_bootpg(&pagesize);
+
+	/*
+	 * pagesize is only 4K or 8K
+	 * we only use the last 4K of boot page
+	 * bootpg_map saves the address for the boot page
+	 * 8K is used for the workaround of 3-way DDR interleaving
+	 */
+
+	bootpg_map = bootpg;
+
+	if (pagesize == 8192)
+		bootpg += 4096;	/* use 2nd half */
+
+	/* Some OSes expect secondary cores to be held in reset */
+	if (hold_cores_in_reset(0))
+		return;
+
+	/*
+	 * Store the bootpg's cache-able half address for use by secondary
+	 * CPU cores to continue to boot
+	 */
+	__bootpg_addr = (u32)virt_to_phys(&__second_half_boot_page);
+
+	/* Store spin table's physical address for use by secondary cores */
+	__spin_table_addr = (u32)get_spin_phys_addr();
+
+	/* flush bootpg it before copying invalidate any staled cacheline */
+	flush_cache(bootpg, 4096);
+
+	/* look for the tlb covering the reset page, there better be one */
+	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_map, pagesize);
+	} else {
+		puts("WARNING: No reset page TLB. "
+			"Skipping secondary core setup\n");
+	}
+}