: arm: Provide lowlevel_init C function wrapper for v7

Make the lowlevel_init function that these platforms have which just sets up the stack and calls a C function available to all armv7 platforms. As part of this we change some of the macros that are used to be more clear. Previously (except for am335x evm) we had been setting CONFIG_SYS_INIT_SP_ADDR to a series of new defines that are equivalent to simply referencing NON_SECURE_SRAM_END. On am335x evm we should have been doing this initially and do now.

Cc Sricharan R <[email protected]>

Signed-off-by Tom Rini <[email protected]>

---
 arch/arm/cpu/armv7/Makefile                    |    6 ++-
 arch/arm/cpu/armv7/lowlevel_init.S             |   50 ++++++++++++++++++++++++
 arch/arm/cpu/armv7/omap-common/lowlevel_init.S |   18 ---------
 arch/arm/include/asm/arch-am33xx/hardware.h    |    3 +-
 arch/arm/include/asm/arch-am33xx/omap.h        |    1 -
 arch/arm/include/asm/arch-omap4/omap.h         |    1 -
 arch/arm/include/asm/arch-omap5/omap.h         |    2 -
 include/configs/am335x_evm.h                   |    4 +-
 include/configs/omap4_common.h                 |    7 +---
 include/configs/omap5_evm.h                    |    7 +---
 10 files changed, 63 insertions(+), 36 deletions(-)
 create mode 100644 arch/arm/cpu/armv7/lowlevel_init.S

arch/arm/cpu/armv7/Makefile +5 -1

index 6b2addc..788eada 100644
@@ -32,8 +32,12 @@ COBJS        += cache_v7.o
 COBJS  += cpu.o
 COBJS  += syslib.o
 
+ifneq ($(CONFIG_AM33XX)$(CONFIG_OMAP44XX)$(CONFIG_OMAP54XX),)
+SOBJS  += lowlevel_init.o
+endif
+
 SRCS   := $(START:.o=.S) $(COBJS:.o=.c)
-OBJS   := $(addprefix $(obj),$(COBJS))
+OBJS   := $(addprefix $(obj),$(COBJS) $(SOBJS))
 START  := $(addprefix $(obj),$(START))
 
 all:   $(obj).depend $(START) $(LIB)

arch/arm/cpu/armv7/lowlevel_init.S new file +50 -0

new file mode 100644
index 0000000..ef04575
@@ -0,0 +1,50 @@
+/*
+ * A lowlevel_init function that sets up the stack to call a C function to
+ * perform further init.
+ *
+ * (C) Copyright 2010
+ * Texas Instruments, <www.ti.com>
+ *
+ * Author :
+ *     Aneesh V        <[email protected]>
+ *
+ * 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 <asm-offsets.h>
+#include <config.h>
+#include <linux/linkage.h>
+
+ENTRY(lowlevel_init)
+       /*
+        * Setup a temporary stack
+        */
+       ldr     sp, =CONFIG_SYS_INIT_SP_ADDR
+
+       /*
+        * Save the old lr(passed in ip) and the current lr to stack
+        */
+       push    {ip, lr}
+
+       /*
+        * go setup pll, mux, memory
+        */
+       bl      s_init
+       pop     {ip, pc}
+ENDPROC(lowlevel_init)

arch/arm/cpu/armv7/omap-common/lowlevel_init.S +0 -18

index ccc6bb6..1ece073 100644
@@ -78,24 +78,6 @@ ENTRY(save_boot_params)
        bx      lr
 ENDPROC(save_boot_params)
 
-ENTRY(lowlevel_init)
-       /*
-        * Setup a temporary stack
-        */
-       ldr     sp, =LOW_LEVEL_SRAM_STACK
-
-       /*
-        * Save the old lr(passed in ip) and the current lr to stack
-        */
-       push    {ip, lr}
-
-       /*
-        * go setup pll, mux, memory
-        */
-       bl      s_init
-       pop     {ip, pc}
-ENDPROC(lowlevel_init)
-
 ENTRY(set_pl310_ctrl_reg)
        PUSH    {r4-r11, lr}    @ save registers - ROM code may pollute
                                @ our registers

arch/arm/include/asm/arch-am33xx/hardware.h +2 -1

index c617331..62332f2 100644
@@ -19,8 +19,9 @@
 #ifndef __AM33XX_HARDWARE_H
 #define __AM33XX_HARDWARE_H
 
+#include <asm/arch/omap.h>
+
 /* Module base addresses */
-#define LOW_LEVEL_SRAM_STACK           0x4030B7FC
 #define UART0_BASE                     0x44E09000
 
 /* DM Timer base addresses */

arch/arm/include/asm/arch-am33xx/omap.h +0 -1

index fc2b7a5..850f8a5 100644
@@ -30,7 +30,6 @@
  */
 #define NON_SECURE_SRAM_START  0x40304000
 #define NON_SECURE_SRAM_END    0x4030E000
-#define LOW_LEVEL_SRAM_STACK   0x4030B7FC
 
 /* ROM code defines */
 /* Boot device */

arch/arm/include/asm/arch-omap4/omap.h +0 -1

index 03bd923..d4b5076 100644
@@ -172,7 +172,6 @@ struct control_lpddr2io_regs {
 /* base address for indirect vectors (internal boot mode) */
 #define SRAM_ROM_VECT_BASE     0x4030D000
 /* Temporary SRAM stack used while low level init is done */
-#define LOW_LEVEL_SRAM_STACK           NON_SECURE_SRAM_END
 #define SRAM_SCRATCH_SPACE_ADDR                NON_SECURE_SRAM_START
 /* SRAM scratch space entries */
 #define OMAP4_SRAM_SCRATCH_OMAP4_REV   SRAM_SCRATCH_SPACE_ADDR

arch/arm/include/asm/arch-omap5/omap.h +0 -2

index 7f05cb5..9dce49a 100644
@@ -262,8 +262,6 @@ struct omap_sys_ctrl_regs {
 #define NON_SECURE_SRAM_END    0x40320000      /* Not inclusive */
 /* base address for indirect vectors (internal boot mode) */
 #define SRAM_ROM_VECT_BASE     0x4031F000
-/* Temporary SRAM stack used while low level init is done */
-#define LOW_LEVEL_SRAM_STACK   NON_SECURE_SRAM_END
 
 #define SRAM_SCRATCH_SPACE_ADDR                NON_SECURE_SRAM_START
 /*

include/configs/am335x_evm.h +2 -2

index 2bfe8c6..a8a6b8e 100644
@@ -148,7 +148,7 @@
 #define CONFIG_MAX_RAM_BANK_SIZE       (1024 << 20)    /* 1GB */
 
 #define CONFIG_SYS_SDRAM_BASE          PHYS_DRAM_1
-#define CONFIG_SYS_INIT_SP_ADDR         (CONFIG_SYS_SDRAM_BASE + 0x1000 - \
+#define CONFIG_SYS_INIT_SP_ADDR         (NON_SECURE_SRAM_END - \
                                                GENERATED_GBL_DATA_SIZE)
  /* Platform/Board specific defs */
 #define CONFIG_SYS_TIMERBASE           0x48040000      /* Use Timer2 */

@@ -195,7 +195,7 @@
 #define CONFIG_SPL
 #define CONFIG_SPL_TEXT_BASE           0x402F0400
 #define CONFIG_SPL_MAX_SIZE            (46 * 1024)
-#define CONFIG_SPL_STACK               LOW_LEVEL_SRAM_STACK
+#define CONFIG_SPL_STACK               CONFIG_SYS_INIT_SP_ADDR
 
 #define CONFIG_SPL_BSS_START_ADDR      0x80000000
 #define CONFIG_SPL_BSS_MAX_SIZE                0x80000         /* 512 KB */

include/configs/omap4_common.h +2 -5

index 6f298a1..2771839 100644
@@ -225,10 +225,7 @@
 #define CONFIG_NR_DRAM_BANKS   1
 
 #define CONFIG_SYS_SDRAM_BASE          0x80000000
-#define CONFIG_SYS_INIT_RAM_ADDR       0x4030D800
-#define CONFIG_SYS_INIT_RAM_SIZE       0x800
-#define CONFIG_SYS_INIT_SP_ADDR                (CONFIG_SYS_INIT_RAM_ADDR + \
-                                        CONFIG_SYS_INIT_RAM_SIZE - \
+#define CONFIG_SYS_INIT_SP_ADDR         (NON_SECURE_SRAM_END - \
                                         GENERATED_GBL_DATA_SIZE)
 
 #ifndef CONFIG_SYS_L2CACHE_OFF

@@ -249,7 +246,7 @@
 #define CONFIG_SPL
 #define CONFIG_SPL_TEXT_BASE           0x40304350
 #define CONFIG_SPL_MAX_SIZE            (38 * 1024)
-#define CONFIG_SPL_STACK               LOW_LEVEL_SRAM_STACK
+#define CONFIG_SPL_STACK               CONFIG_SYS_INIT_SP_ADDR
 
 /*
  * 64 bytes before this address should be set aside for u-boot.img's

include/configs/omap5_evm.h +1 -4

index 0884280..4d6de16 100644
@@ -228,10 +228,7 @@
 #define CONFIG_NR_DRAM_BANKS   1
 
 #define CONFIG_SYS_SDRAM_BASE          0x80000000
-#define CONFIG_SYS_INIT_RAM_ADDR       0x4030D800
-#define CONFIG_SYS_INIT_RAM_SIZE       0x800
-#define CONFIG_SYS_INIT_SP_ADDR                (CONFIG_SYS_INIT_RAM_ADDR + \
-                                        CONFIG_SYS_INIT_RAM_SIZE - \
+#define CONFIG_SYS_INIT_SP_ADDR         (NON_SECURE_SRAM_END - \
                                         GENERATED_GBL_DATA_SIZE)
 
 #define CONFIG_SYS_EMIF_PRECALCULATED_TIMING_REGS

Hi Tom,

Quoted 249 lines · Tom Rini

Make the lowlevel_init function that these platforms have which just sets up the stack and calls a C function available to all armv7 platforms. As part of this we change some of the macros that are used to be more clear. Previously (except for am335x evm) we had been setting CONFIG_SYS_INIT_SP_ADDR to a series of new defines that are equivalent to simply referencing NON_SECURE_SRAM_END. On am335x evm we should have been doing this initially and do now.

Cc Sricharan R <[email protected]>

Signed-off-by Tom Rini <[email protected]>

---
 arch/arm/cpu/armv7/Makefile                    |    6 ++-
 arch/arm/cpu/armv7/lowlevel_init.S             |   50 ++++++++++++++++++++++++
 arch/arm/cpu/armv7/omap-common/lowlevel_init.S |   18 ---------
 arch/arm/include/asm/arch-am33xx/hardware.h    |    3 +-
 arch/arm/include/asm/arch-am33xx/omap.h        |    1 -
 arch/arm/include/asm/arch-omap4/omap.h         |    1 -
 arch/arm/include/asm/arch-omap5/omap.h         |    2 -
 include/configs/am335x_evm.h                   |    4 +-
 include/configs/omap4_common.h                 |    7 +---
 include/configs/omap5_evm.h                    |    7 +---
 10 files changed, 63 insertions(+), 36 deletions(-)
 create mode 100644 arch/arm/cpu/armv7/lowlevel_init.S

arch/arm/cpu/armv7/Makefile +5 -1

index 6b2addc..788eada 100644
@@ -32,8 +32,12 @@ COBJS        += cache_v7.o
 COBJS  += cpu.o
 COBJS  += syslib.o
 
+ifneq ($(CONFIG_AM33XX)$(CONFIG_OMAP44XX)$(CONFIG_OMAP54XX),)
+SOBJS  += lowlevel_init.o
+endif
+
 SRCS   := $(START:.o=.S) $(COBJS:.o=.c)
-OBJS   := $(addprefix $(obj),$(COBJS))
+OBJS   := $(addprefix $(obj),$(COBJS) $(SOBJS))
 START  := $(addprefix $(obj),$(START))
 
 all:   $(obj).depend $(START) $(LIB)

arch/arm/cpu/armv7/lowlevel_init.S new file +50 -0

new file mode 100644
index 0000000..ef04575
@@ -0,0 +1,50 @@
+/*
+ * A lowlevel_init function that sets up the stack to call a C function to
+ * perform further init.
+ *
+ * (C) Copyright 2010
+ * Texas Instruments, <www.ti.com>
+ *
+ * Author :
+ *     Aneesh V        <[email protected]>
+ *
+ * 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 <asm-offsets.h>
+#include <config.h>
+#include <linux/linkage.h>
+
+ENTRY(lowlevel_init)
+       /*
+        * Setup a temporary stack
+        */
+       ldr     sp, =CONFIG_SYS_INIT_SP_ADDR
+
+       /*
+        * Save the old lr(passed in ip) and the current lr to stack
+        */
+       push    {ip, lr}
+
+       /*
+        * go setup pll, mux, memory
+        */
+       bl      s_init
+       pop     {ip, pc}
+ENDPROC(lowlevel_init)

arch/arm/cpu/armv7/omap-common/lowlevel_init.S +0 -18

index ccc6bb6..1ece073 100644
@@ -78,24 +78,6 @@ ENTRY(save_boot_params)
        bx      lr
 ENDPROC(save_boot_params)
 
-ENTRY(lowlevel_init)
-       /*
-        * Setup a temporary stack
-        */
-       ldr     sp, =LOW_LEVEL_SRAM_STACK
-
-       /*
-        * Save the old lr(passed in ip) and the current lr to stack
-        */
-       push    {ip, lr}
-
-       /*
-        * go setup pll, mux, memory
-        */
-       bl      s_init
-       pop     {ip, pc}
-ENDPROC(lowlevel_init)
-
 ENTRY(set_pl310_ctrl_reg)
        PUSH    {r4-r11, lr}    @ save registers - ROM code may pollute
                                @ our registers

arch/arm/include/asm/arch-am33xx/hardware.h +2 -1

index c617331..62332f2 100644
@@ -19,8 +19,9 @@
 #ifndef __AM33XX_HARDWARE_H
 #define __AM33XX_HARDWARE_H
 
+#include <asm/arch/omap.h>
+
 /* Module base addresses */
-#define LOW_LEVEL_SRAM_STACK           0x4030B7FC
 #define UART0_BASE                     0x44E09000
 
 /* DM Timer base addresses */

arch/arm/include/asm/arch-am33xx/omap.h +0 -1

index fc2b7a5..850f8a5 100644
@@ -30,7 +30,6 @@
  */
 #define NON_SECURE_SRAM_START  0x40304000
 #define NON_SECURE_SRAM_END    0x4030E000
-#define LOW_LEVEL_SRAM_STACK   0x4030B7FC
 
 /* ROM code defines */
 /* Boot device */

arch/arm/include/asm/arch-omap4/omap.h +0 -1

index 03bd923..d4b5076 100644
@@ -172,7 +172,6 @@ struct control_lpddr2io_regs {
 /* base address for indirect vectors (internal boot mode) */
 #define SRAM_ROM_VECT_BASE     0x4030D000
 /* Temporary SRAM stack used while low level init is done */
-#define LOW_LEVEL_SRAM_STACK           NON_SECURE_SRAM_END
 #define SRAM_SCRATCH_SPACE_ADDR                NON_SECURE_SRAM_START
 /* SRAM scratch space entries */
 #define OMAP4_SRAM_SCRATCH_OMAP4_REV   SRAM_SCRATCH_SPACE_ADDR

arch/arm/include/asm/arch-omap5/omap.h +0 -2

index 7f05cb5..9dce49a 100644
@@ -262,8 +262,6 @@ struct omap_sys_ctrl_regs {
 #define NON_SECURE_SRAM_END    0x40320000      /* Not inclusive */
 /* base address for indirect vectors (internal boot mode) */
 #define SRAM_ROM_VECT_BASE     0x4031F000
-/* Temporary SRAM stack used while low level init is done */
-#define LOW_LEVEL_SRAM_STACK   NON_SECURE_SRAM_END
 
 #define SRAM_SCRATCH_SPACE_ADDR                NON_SECURE_SRAM_START
 /*

include/configs/am335x_evm.h +2 -2

index 2bfe8c6..a8a6b8e 100644
@@ -148,7 +148,7 @@
 #define CONFIG_MAX_RAM_BANK_SIZE       (1024 << 20)    /* 1GB */
 
 #define CONFIG_SYS_SDRAM_BASE          PHYS_DRAM_1
-#define CONFIG_SYS_INIT_SP_ADDR         (CONFIG_SYS_SDRAM_BASE + 0x1000 - \
+#define CONFIG_SYS_INIT_SP_ADDR         (NON_SECURE_SRAM_END - \
                                                GENERATED_GBL_DATA_SIZE)
  /* Platform/Board specific defs */
 #define CONFIG_SYS_TIMERBASE           0x48040000      /* Use Timer2 */

@@ -195,7 +195,7 @@
 #define CONFIG_SPL
 #define CONFIG_SPL_TEXT_BASE           0x402F0400
 #define CONFIG_SPL_MAX_SIZE            (46 * 1024)
-#define CONFIG_SPL_STACK               LOW_LEVEL_SRAM_STACK
+#define CONFIG_SPL_STACK               CONFIG_SYS_INIT_SP_ADDR
 
 #define CONFIG_SPL_BSS_START_ADDR      0x80000000
 #define CONFIG_SPL_BSS_MAX_SIZE                0x80000         /* 512 KB */

include/configs/omap4_common.h +2 -5

index 6f298a1..2771839 100644
@@ -225,10 +225,7 @@
 #define CONFIG_NR_DRAM_BANKS   1
 
 #define CONFIG_SYS_SDRAM_BASE          0x80000000
-#define CONFIG_SYS_INIT_RAM_ADDR       0x4030D800
-#define CONFIG_SYS_INIT_RAM_SIZE       0x800
-#define CONFIG_SYS_INIT_SP_ADDR                (CONFIG_SYS_INIT_RAM_ADDR + \
-                                        CONFIG_SYS_INIT_RAM_SIZE - \
+#define CONFIG_SYS_INIT_SP_ADDR         (NON_SECURE_SRAM_END - \
                                         GENERATED_GBL_DATA_SIZE)
 
 #ifndef CONFIG_SYS_L2CACHE_OFF

@@ -249,7 +246,7 @@
 #define CONFIG_SPL
 #define CONFIG_SPL_TEXT_BASE           0x40304350
 #define CONFIG_SPL_MAX_SIZE            (38 * 1024)
-#define CONFIG_SPL_STACK               LOW_LEVEL_SRAM_STACK
+#define CONFIG_SPL_STACK               CONFIG_SYS_INIT_SP_ADDR
 
 /*
  * 64 bytes before this address should be set aside for u-boot.img's

include/configs/omap5_evm.h +2 -5

index 0884280..4d6de16 100644
@@ -228,10 +228,7 @@
 #define CONFIG_NR_DRAM_BANKS   1
 
 #define CONFIG_SYS_SDRAM_BASE          0x80000000
-#define CONFIG_SYS_INIT_RAM_ADDR       0x4030D800
-#define CONFIG_SYS_INIT_RAM_SIZE       0x800
-#define CONFIG_SYS_INIT_SP_ADDR                (CONFIG_SYS_INIT_RAM_ADDR + \
-                                        CONFIG_SYS_INIT_RAM_SIZE - \
+#define CONFIG_SYS_INIT_SP_ADDR         (NON_SECURE_SRAM_END - \
                                         GENERATED_GBL_DATA_SIZE)
 
 #define CONFIG_SYS_EMIF_PRECALCULATED_TIMING_REGS

@@ -246,7 +243,7 @@
 #define CONFIG_SPL
 #define CONFIG_SPL_TEXT_BASE           0x40300350
 #define CONFIG_SPL_MAX_SIZE            0x19000 /* 100K */
-#define CONFIG_SPL_STACK               LOW_LEVEL_SRAM_STACK
+#define CONFIG_SPL_STACK               CONFIG_SYS_INIT_SP_ADDR
 

include/configs/omap5_evm.h line 249

Quoted 2 lines

include/configs/omap5_evm.h +0 -0

 #define CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR        0x300 /* address 0x60000 */
 #define CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS     0x200 /* 256 KB */

Looks fine cleanup for me.
A small concern now is the size of available SRAM for
SPL text is now reduced by GENERATED_GBL_DATA_SIZE, though it is small.
SRAM size available for SPL code is a concern in OMAP4 platforms.
Do you prefer keeping CONFIG_SPL_STACK to NON_SECURE_SRAM_END ?

Make the lowlevel_init function that these platforms have which just sets up the stack and calls a C function available to all armv7 platforms. As part of this we change some of the macros that are used to be more clear. Previously (except for am335x evm) we had been setting CONFIG_SYS_INIT_SP_ADDR to a series of new defines that are equivalent to simply referencing NON_SECURE_SRAM_END. On am335x evm we should have been doing this initially and do now.

Cc Sricharan R <[email protected]>

Signed-off-by Tom Rini <[email protected]>

---

Make sure that when we setup the stack before calling s_init() we have the stack have 8-byte alignment for ABI compliance.

Signed-off-by Tom Rini <[email protected]>

---

Hey all,

As Allen Martin noted, on tegra platforms a bug is exposed when using certain toolchains that currently calls to lowlevel_init must be calls to another assembly function as the stack is not explicitly setup / saved and thus register corruption can occur. Over in TI-land Aneesh V wrote a lowlevel_init that sets up the stack and calls s_init which is a C function that does what lowlevel_init does on other platforms. The code is generic to at least v7, so this series moves it to arch/arm/cpu/armv7.

Quoted 2 lines · Tom Rini

Hey all,

Hi Tom,

Quoted 8 lines

As Allen Martin noted, on tegra platforms a bug is exposed when using certain toolchains that currently calls to lowlevel_init must be calls to another assembly function as the stack is not explicitly setup / saved and thus register corruption can occur. Over in TI-land Aneesh V wrote a lowlevel_init that sets up the stack and calls s_init which is a C function that does what lowlevel_init does on other platforms. The code is generic to at least v7, so this series moves it to arch/arm/cpu/armv7.

Then as far as I can see in your patch, other armv7 can profit as well, such as the i.MX5 and i.MX6 ;-)

The only issue is to generalize the entry point for the function to setup PLL and or pinmux. It should be enough to change lowlevel_init to s_init in i.MX to do the job.

Hey all,

As Allen Martin noted, on tegra platforms a bug is exposed when using certain toolchains that currently calls to lowlevel_init must be calls to another assembly function as the stack is not explicitly setup / saved and thus register corruption can occur. Over in TI-land Aneesh V wrote a lowlevel_init that sets up the stack and calls s_init which is a C function that does what lowlevel_init does on other platforms. The code is generic to at least v7, so this series moves it to arch/arm/cpu/armv7. The initial version of the code made use of LOW_LEVEL_SRAM_STACK as the stack to be setup. This define is essentially another name for CONFIG_SYS_INIT_SP_ADDR without taking GENERATED_GBL_DATA_SIZE into consideration. So we switch to that instead. Finally, Wolfgang question me as to if the stack really only needed the alignment that we had been giving it. To be safe, I grabbed the alignmnet that we do when setting up the initial stack for real and placed it into lowlevel_init as well.

Tested on AM335x GP EVM and OMAP4 Pandaboard ES2.