SPL: Create arch/arm/lib/spl.c for board_init_f and jump_to_image_linux

In SPL (CONFIG_SPL_FRAMEWORK) board_init_f must setup the stack pointer,
clear the BSS and call board_init_r.  We mark this as weak as some
platforms may need to perform additional initalization at this point.
We provide a gd that we know will be in a usable location, once the BSS
has been cleared to help with this as well.  Finally, we no longer call
relocate_code so remove that from the armv7 version.

Next, both board_init_f and jump_to_image_linux are going to be
inherently arch-specific, so move these versions to arch/arm/lib/spl.c

Signed-off-by: Tom Rini <trini@ti.com>

arch/arm/cpu/armv7/am33xx/board.c

@@ -166,6 +166,8 @@ void s_init(void)
 	regVal |= UART_SMART_IDLE_EN;
 	writel(regVal, &uart_base->uartsyscfg);
 
+	gd = &gdata;
+
 	preloader_console_init();
 
 	/* Initalize the board header */

arch/arm/cpu/armv7/omap-common/hwinit-common.c

@@ -124,6 +124,9 @@ void s_init(void)
 	set_mux_conf_regs();
 #ifdef CONFIG_SPL_BUILD
 	setup_clocks_for_console();
+
+	gd = &gdata;
+
 	preloader_console_init();
 	do_io_settings();
 #endif

arch/arm/cpu/armv7/omap3/board.c

@@ -45,6 +45,8 @@
 #include <i2c.h>
 #include <linux/compiler.h>
 
+DECLARE_GLOBAL_DATA_PTR;
+
 /* Declarations */
 extern omap3_sysinfo sysinfo;
 static void omap3_setup_aux_cr(void);
@@ -252,6 +254,8 @@ void s_init(void)
 #endif
 
 #ifdef CONFIG_SPL_BUILD
+	gd = &gdata;
+
 	preloader_console_init();
 
 	timer_init();

arch/arm/cpu/armv7/start.S

@@ -164,6 +164,7 @@ call_board_init_f:
 
 /*------------------------------------------------------------------------------*/
 
+#ifndef CONFIG_SPL_BUILD
 /*
  * void relocate_code (addr_sp, gd, addr_moni)
  *
@@ -194,7 +195,6 @@ copy_loop:
 	cmp	r0, r2			/* until source end address [r2]    */
 	blo	copy_loop
 
-#ifndef CONFIG_SPL_BUILD
 	/*
 	 * fix .rel.dyn relocations
 	 */
@@ -241,20 +241,12 @@ _rel_dyn_end_ofs:
 _dynsym_start_ofs:
 	.word __dynsym_start - _start
 
-#endif	/* #ifndef CONFIG_SPL_BUILD */
-
 clear_bss:
-#ifdef CONFIG_SPL_BUILD
-	/* No relocation for SPL */
-	ldr	r0, =__bss_start
-	ldr	r1, =__bss_end__
-#else
 	ldr	r0, _bss_start_ofs
 	ldr	r1, _bss_end_ofs
 	mov	r4, r6			/* reloc addr */
 	add	r0, r0, r4
 	add	r1, r1, r4
-#endif
 	mov	r2, #0x00000000		/* clear			    */
 
 clbss_l:cmp	r0, r1			/* clear loop... */
@@ -281,12 +273,10 @@ jump_2_ram:
  * Move vector table
  */
 #if !defined(CONFIG_TEGRA20)
-#if !(defined(CONFIG_OMAP44XX) && defined(CONFIG_SPL_BUILD))
 	/* Set vector address in CP15 VBAR register */
 	ldr     r0, =_start
 	add     r0, r0, r9
 	mcr     p15, 0, r0, c12, c0, 0  @Set VBAR
-#endif
 #endif /* !Tegra20 */
 
 	ldr	r0, _board_init_r_ofs
@@ -302,6 +292,7 @@ jump_2_ram:
 _board_init_r_ofs:
 	.word board_init_r - _start
 ENDPROC(relocate_code)
+#endif
 
 /*************************************************************************
  *

arch/arm/include/asm/spl.h

@@ -26,4 +26,9 @@
 /* Platform-specific defines */
 #include <asm/arch/spl.h>
 
+/* Linker symbols. */
+extern char __bss_start[], __bss_end__[];
+
+extern gd_t gdata;
+
 #endif

arch/arm/lib/Makefile

@@ -44,6 +44,8 @@ COBJS-y	+= interrupts.o
 COBJS-y	+= reset.o
 SOBJS-$(CONFIG_USE_ARCH_MEMSET) += memset.o
 SOBJS-$(CONFIG_USE_ARCH_MEMCPY) += memcpy.o
+else
+COBJS-$(CONFIG_SPL_FRAMEWORK) += spl.o
 endif
 
 COBJS-y	+= cache.o

arch/arm/lib/spl.c

+/*
+ * (C) Copyright 2010-2012
+ * Texas Instruments, <www.ti.com>
+ *
+ * Aneesh V <aneesh@ti.com>
+ * Tom Rini <trini@ti.com>
+ *
+ * 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 <config.h>
+#include <spl.h>
+#include <image.h>
+#include <linux/compiler.h>
+
+/* Pointer to as well as the global data structure for SPL */
+DECLARE_GLOBAL_DATA_PTR;
+gd_t gdata __attribute__ ((section(".data")));
+
+/*
+ * In the context of SPL, board_init_f must ensure that any clocks/etc for
+ * DDR are enabled, ensure that the stack pointer is valid, clear the BSS
+ * and call board_init_f.  We provide this version by default but mark it
+ * as __weak to allow for platforms to do this in their own way if needed.
+ */
+void __weak board_init_f(ulong dummy)
+{
+	/* Set the stack pointer. */
+	asm volatile("mov sp, %0\n" : : "r"(CONFIG_SPL_STACK));
+
+	/* Clear the BSS. */
+	memset(__bss_start, 0, __bss_end__ - __bss_start);
+
+	/* Set global data pointer. */
+	gd = &gdata;
+
+	board_init_r(NULL, 0);
+}
+
+/*
+ * This function jumps to an image with argument. Normally an FDT or ATAGS
+ * image.
+ * arg: Pointer to paramter image in RAM
+ */
+#ifdef CONFIG_SPL_OS_BOOT
+void __noreturn jump_to_image_linux(void *arg)
+{
+	debug("Entering kernel arg pointer: 0x%p\n", arg);
+	typedef void (*image_entry_arg_t)(int, int, void *)
+		__attribute__ ((noreturn));
+	image_entry_arg_t image_entry =
+		(image_entry_arg_t) spl_image.entry_point;
+	cleanup_before_linux();
+	image_entry(0, CONFIG_MACH_TYPE, arg);
+}
+#endif

common/spl/spl.c

@@ -38,8 +38,7 @@ DECLARE_GLOBAL_DATA_PTR;
 u32 *boot_params_ptr = NULL;
 struct spl_image_info spl_image;
 
-/* Define global data structure pointer to it*/
-static gd_t gdata __attribute__ ((section(".data")));
+/* Define board data structure */
 static bd_t bdata __attribute__ ((section(".data")));
 
 inline void hang(void)
@@ -49,18 +48,6 @@ inline void hang(void)
 		;
 }
 
-void board_init_f(ulong dummy)
-{
-	/*
-	 * We call relocate_code() with relocation target same as the
-	 * CONFIG_SYS_SPL_TEXT_BASE. This will result in relocation getting
-	 * skipped. Instead, only .bss initialization will happen. That's
-	 * all we need
-	 */
-	debug(">>board_init_f()\n");
-	relocate_code(CONFIG_SPL_STACK, &gdata, CONFIG_SPL_TEXT_BASE);
-}
-
 /*
  * Default function to determine if u-boot or the OS should
  * be started. This implementation always returns 1.
@@ -107,24 +94,6 @@ void spl_parse_image_header(const struct image_header *header)
 	}
 }
 
-/*
- * This function jumps to an image with argument. Normally an FDT or ATAGS
- * image.
- * arg: Pointer to paramter image in RAM
- */
-#ifdef CONFIG_SPL_OS_BOOT
-static void __noreturn jump_to_image_linux(void *arg)
-{
-	debug("Entering kernel arg pointer: 0x%p\n", arg);
-	typedef void (*image_entry_arg_t)(int, int, void *)
-		__attribute__ ((noreturn));
-	image_entry_arg_t image_entry =
-		(image_entry_arg_t) spl_image.entry_point;
-	cleanup_before_linux();
-	image_entry(0, CONFIG_MACH_TYPE, arg);
-}
-#endif
-
 static void __noreturn jump_to_image_no_args(void)
 {
 	typedef void __noreturn (*image_entry_noargs_t)(u32 *);
@@ -140,7 +109,7 @@ static void __noreturn jump_to_image_no_args(void)
 	image_entry((u32 *)boot_params_ptr_addr);
 }
 
-void board_init_r(gd_t *id, ulong dummy)
+void board_init_r(gd_t *dummy1, ulong dummy2)
 {
 	u32 boot_device;
 	debug(">>spl:board_init_r()\n");
@@ -204,10 +173,12 @@ void board_init_r(gd_t *id, ulong dummy)
 	}
 }
 
-/* This requires UART clocks to be enabled */
+/*
+ * This requires UART clocks to be enabled.  In order for this to work the
+ * caller must ensure that the gd pointer is valid.
+ */
 void preloader_console_init(void)
 {
-	gd = &gdata;
 	gd->bd = &bdata;
 	gd->flags |= GD_FLG_RELOC;
 	gd->baudrate = CONFIG_BAUDRATE;

include/spl.h

@@ -24,6 +24,7 @@
 #define	_SPL_H_
 
 /* Platform-specific defines */
+#include <linux/compiler.h>
 #include <asm/spl.h>
 
 /* Boot type */
@@ -48,6 +49,7 @@ u32 spl_boot_device(void);
 u32 spl_boot_mode(void);
 void spl_parse_image_header(const struct image_header *header);
 void spl_board_prepare_for_linux(void);
+void __noreturn jump_to_image_linux(void *arg);
 int spl_start_uboot(void);
 void spl_display_print(void);