/*
- * Copyright (C) 2012-2014 Panasonic Corporation
- * Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
+ * Copyright (C) 2012-2015 Masahiro Yamada <yamada.masahiro@socionext.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <config.h>
#include <linux/linkage.h>
+#include <linux/sizes.h>
#include <asm/system.h>
#include <mach/led.h>
#include <mach/arm-mpcore.h>
#include <mach/sbc-regs.h>
+#include <mach/ssc-regs.h>
ENTRY(lowlevel_init)
mov r8, lr @ persevere link reg across call
* First we need to turn on MMU and Dcache again to get back
* data access to L2.
*/
- mrc p15, 0, r0, c1, c0, 0 @ SCTLR (System Contrl Register)
- orr r0, r0, #(CR_C | CR_M) @ enable MMU and Dcache
+ mrc p15, 0, r0, c1, c0, 0 @ SCTLR (System Control Register)
+ orr r0, r0, #(CR_C | CR_M) @ enable MMU and Dcache
mcr p15, 0, r0, c1, c0, 0
#ifdef CONFIG_DEBUG_LL
ldr r3, =init_page_table @ page table must be 16KB aligned
/* Disable MMU and Dcache before switching Page Table */
- mrc p15, 0, r0, c1, c0, 0 @ SCTLR (System Contrl Register)
+ mrc p15, 0, r0, c1, c0, 0 @ SCTLR (System Control Register)
bic r0, r0, #(CR_C | CR_M) @ disable MMU and Dcache
mcr p15, 0, r0, c1, c0, 0
bl enable_mmu
#ifdef CONFIG_UNIPHIER_SMP
+secondary_startup:
/*
- * ACTLR (Auxiliary Control Register) for Cortex-A9
- * bit[9] Parity on
- * bit[8] Alloc in one way
- * bit[7] EXCL (Exclusive cache bit)
- * bit[6] SMP
- * bit[3] Write full line of zeros mode
- * bit[2] L1 Prefetch enable
- * bit[1] L2 prefetch enable
- * bit[0] FW (Cache and TLB maintenance broadcast)
+ * 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
*/
- mrc p15, 0, r0, c1, c0, 1 @ ACTLR (Auxiliary Control Register)
- orr r0, r0, #0x41 @ enable SMP, FW bit
- mcr p15, 0, r0, c1, c0, 1
/* branch by CPU ID */
mrc p15, 0, r0, c0, c0, 5 @ MPIDR (Multiprocessor Affinity Register)
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 sedoncary CPU
- mrc p15, 4, r1, c15, c0, 0 @ Configuration Base Address Register
- bfc r1, #0, #13 @ clear bit 12-0
- mov r0, #-1
- str r0, [r1, #SCU_INV_ALL] @ SCU Invalidate All Register
- mov r0, #1 @ SCU enable
- str r0, [r1, #SCU_CTRL] @ SCU Control Register
+ sev @ kick the secondary CPU
#endif
bl setup_init_ram @ RAM area for temporary stack pointer
* TLBs was already invalidated in "../start.S"
* So, we don't need to invalidate it here.
*/
- mrc p15, 0, r0, c1, c0, 0 @ SCTLR (System Contrl Register)
+ mrc p15, 0, r0, c1, c0, 0 @ SCTLR (System Control Register)
orr r0, r0, #(CR_C | CR_M) @ MMU and Dcache enable
mcr p15, 0, r0, c1, c0, 0
mov pc, lr
ENDPROC(enable_mmu)
-#include <mach/ssc-regs.h>
-
-#define BOOT_RAM_SIZE (SSC_WAY_SIZE)
+/*
+ * For PH1-Pro4 or older SoCs, the size of WAY is 32KB.
+ * It is large enough for tmp RAM.
+ */
+#define BOOT_RAM_SIZE (SZ_32K)
#define BOOT_WAY_BITS (0x00000100) /* way 8 */
ENTRY(setup_init_ram)
ldr r0, = 0x00408006 @ touch to zero with address range
ldr r1, = SSCOQM
str r0, [r1]
- ldr r0, = (CONFIG_SYS_INIT_SP_ADDR - BOOT_RAM_SIZE) @ base address
+ ldr r0, = (CONFIG_SPL_STACK - BOOT_RAM_SIZE) @ base address
ldr r1, = SSCOQAD
str r0, [r1]
ldr r0, = BOOT_RAM_SIZE
ldr r1, = SSCOPPQSEF
ldr r0, [r1]
cmp r0, #0 @ check if the command is successfully set
- bne 0b @ try again if an error occurres
+ bne 0b @ try again if an error occurs
ldr r1, = SSCOLPQS
1:
projects / u-boot / blobdiff