obj-$(CONFIG_BOARD_LATE_INIT) += board_late_init.o
obj-y += reset.o
obj-y += cache_uniphier.o
-obj-$(CONFIG_UNIPHIER_SMP) += smp.o
obj-$(CONFIG_CMD_PINMON) += cmd_pinmon.o
obj-$(CONFIG_CMD_DDRPHY_DUMP) += cmd_ddrphy.o
/*
* Copyright (C) 2012-2014 Panasonic Corporation
- * Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
+ * Copyright (C) 2015 Socionext Inc.
+ * Author: Masahiro Yamada <yamada.masahiro@socionext.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
writel(tmp, SSCC);
}
-void wakeup_secondary(void);
-
void enable_caches(void)
{
uint32_t reg;
-#ifdef CONFIG_UNIPHIER_SMP
- /*
- * The secondary CPU must move to DDR,
- * before L2 disable.
- * On SPL, the Page Table is located on the L2.
- */
- wakeup_secondary();
-#endif
/*
* UniPhier SoCs must use L2 cache for init stack pointer.
* We disable L2 and L1 in this order.
bl enable_mmu
#ifdef CONFIG_UNIPHIER_SMP
+secondary_startup:
+ /*
+ * Entry point for secondary CPUs
+ *
+ * The Boot ROM has already enabled MMU for the secondary CPUs as well
+ * as for the primary one. The MMU table embedded in the Boot ROM
+ * prohibits the DRAM access, so it is impossible to bring the
+ * secondary CPUs into DRAM directly. They must jump here into SPL,
+ * which is run on L2 cache.
+ *
+ * Boot Sequence
+ * [primary CPU] [secondary CPUs]
+ * start from Boot ROM start from Boot ROM
+ * jump to SPL sleep in Boot ROM
+ * kick secondaries ---(sev)---> jump to SPL
+ * jump to U-Boot main sleep in SPL
+ * jump to Linux
+ * kick secondaries ---(sev)---> jump to Linux
+ */
/*
* ACTLR (Auxiliary Control Register) for Cortex-A9
* bit[9] Parity on
and r0, r0, #0x3
cmp r0, #0x0
beq primary_cpu
- ldr r1, =ROM_BOOT_ROMRSV2
+ /* only for secondary CPUs */
+ ldr r1, =ROM_BOOT_ROMRSV2 @ The last data access to L2 cache
+ mrc p15, 0, r0, c1, c0, 0 @ SCTLR (System Control Register)
+ orr r0, r0, #CR_I @ Enable ICache
+ bic r0, r0, #(CR_C | CR_M) @ MMU and Dcache must be disabled
+ mcr p15, 0, r0, c1, c0, 0 @ before jumping to Linux
mov r0, #0
str r0, [r1]
-0: wfe
- ldr r0, [r1]
+ b 1f
+ /*
+ * L2 cache is shared among all the CPUs and it might be disabled by
+ * the primary one. Before that, the following 5 lines must be cached
+ * on the Icaches of the secondary CPUs.
+ */
+0: wfe @ kicked by Linux
+1: ldr r0, [r1]
cmp r0, #0
- beq 0b
- bx r0 @ r0: entry point of U-Boot main for the secondary CPU
+ bxne r0 @ r0: Linux entry for secondary CPUs
+ b 0b
primary_cpu:
ldr r1, =ROM_BOOT_ROMRSV2
- ldr r0, =_start @ entry for the secondary CPU
+ ldr r0, =secondary_startup
str r0, [r1]
ldr r0, [r1] @ make sure str is complete before sev
sev @ kick the secondary CPU
+++ /dev/null
-/*
- * Copyright (C) 2013 Panasonic Corporation
- * Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
- *
- * SPDX-License-Identifier: GPL-2.0+
- */
-
-#include <config.h>
-#include <linux/linkage.h>
-#include <asm/system.h>
-#include <mach/led.h>
-#include <mach/sbc-regs.h>
-
-/* Entry point of U-Boot main program for the secondary CPU */
-LENTRY(secondary_entry)
- mrc p15, 0, r0, c1, c0, 0 @ SCTLR (System Contrl Register)
- bic r0, r0, #(CR_C | CR_M) @ MMU and Dcache disable
- mcr p15, 0, r0, c1, c0, 0
- mcr p15, 0, r0, c8, c7, 0 @ invalidate TLBs
- mcr p15, 0, r0, c7, c5, 0 @ invalidate icache
- dsb
- led_write(C,0,,)
- ldr r1, =ROM_BOOT_ROMRSV2
- mov r0, #0
- str r0, [r1]
-0: wfe
- ldr r4, [r1] @ r4: entry point for secondary CPUs
- cmp r4, #0
- beq 0b
- led_write(C, P, U, 1)
- bx r4 @ secondary CPUs jump to linux
-ENDPROC(secondary_entry)
-
-ENTRY(wakeup_secondary)
- ldr r1, =ROM_BOOT_ROMRSV2
-0: ldr r0, [r1]
- cmp r0, #0
- bne 0b
-
- /* set entry address and send event to the secondary CPU */
- ldr r0, =secondary_entry
- str r0, [r1]
- ldr r0, [r1] @ make sure store is complete
- mov r0, #0x100
-0: subs r0, r0, #1 @ I don't know the reason, but without this wait
- bne 0b @ fails to wake up the secondary CPU
- sev
-
- /* wait until the secondary CPU reach to secondary_entry */
-0: ldr r0, [r1]
- cmp r0, #0
- bne 0b
- bx lr
-ENDPROC(wakeup_secondary)
projects / u-boot / commitdiff