[U-Boot] [RFC PATCH 01/19] Introduce generic global_data

[Simon Glass]

We want to unify the global_data structure. Most fields are common across
architectures, but there are a fair number of SOC-specific additions. It
isn't clear how best to deal with these, but for now we just use #ifdef.

Checkpatch warnings here might be unavoidable:

warning: include/asm-generic/global_data.h,43: do not add new typedefs
warning: include/asm-generic/global_data.h,117: Use of volatile is usually wrong: see Documentation/volatile-considered-harmful.txt
warning: include/asm-generic/global_data.h,121: storage class should be at the beginning of the declaration

Signed-off-by: Simon Glass <sjg at chromium.org>
---
 include/asm-generic/global_data.h |  125 +++++++++++++++++++++++++++++++++++++
 1 files changed, 125 insertions(+), 0 deletions(-)
 create mode 100644 include/asm-generic/global_data.h

diff --git a/include/asm-generic/global_data.h b/include/asm-generic/global_data.h
new file mode 100644
index 0000000..16fee5a
--- /dev/null
+++ b/include/asm-generic/global_data.h
@@ -0,0 +1,125 @@
+/*
+ * (C) Copyright 2002-2010
+ * Wolfgang Denk, DENX Software Engineering, wd at denx.de.
+ *
+ * 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
+ */
+
+#ifndef	__ASM_GENERIC_GBL_DATA_H
+#define __ASM_GENERIC_GBL_DATA_H
+/*
+ * The following data structure is placed in some memory which is
+ * available very early after boot (like DPRAM on MPC8xx/MPC82xx, or
+ * some locked parts of the data cache) to allow for a minimum set of
+ * global variables during system initialization (until we have set
+ * up the memory controller so that we can use RAM).
+ *
+ * Keep it *SMALL* and remember to set GENERATED_GBL_DATA_SIZE > sizeof(gd_t)
+ *
+ * sjg at chromium.org: Well it would be nice to have a generic one of these
+ * since so many fields are similar. But it means that everyone architecture
+ * will want to add its own nutty fields. Perhaps that is no bad thing since
+ * it shows up inconsistences and might produce downward pressure on the
+ * number of fields.
+ */
+
+#ifndef __ASSEMBLY__
+typedef struct global_data {
+	bd_t		*bd;
+	unsigned long	flags;
+	unsigned long	baudrate;
+	unsigned long	have_console;	/* serial_init() was called */
+#ifdef CONFIG_PRE_CONSOLE_BUFFER
+	unsigned long	precon_buf_idx;	/* Pre-Console buffer index */
+#endif
+	unsigned long	env_addr;	/* Address  of Environment struct */
+	unsigned long	env_valid;	/* Checksum of Environment valid? */
+	unsigned long	fb_base;	/* base address of frame buffer */
+#ifdef CONFIG_FSL_ESDHC
+	unsigned long	sdhc_clk;
+#endif
+	/* Here begins ARM-specific things. Needs discussion */
+#ifdef CONFIG_AT91FAMILY
+	/* "static data" needed by at91's clock.c */
+	unsigned long	cpu_clk_rate_hz;
+	unsigned long	main_clk_rate_hz;
+	unsigned long	mck_rate_hz;
+	unsigned long	plla_rate_hz;
+	unsigned long	pllb_rate_hz;
+	unsigned long	at91_pllb_usb_init;
+#endif
+#ifdef CONFIG_ARM
+	/* "static data" needed by most of timer.c on ARM platforms */
+	unsigned long	timer_rate_hz;
+	unsigned long	tbl;
+	unsigned long	tbu;
+	unsigned long long	timer_reset_value;
+	unsigned long	lastinc;
+#endif
+#ifdef CONFIG_IXP425
+	unsigned long	timestamp;
+#endif
+	/* TODO: is this the same as relocaddr, or something else? */
+	unsigned long	dest_addr;	/* Post-relocation address of U-Boot */
+	unsigned long	dest_addr_sp;
+
+	unsigned long	relocaddr;	/* Start address of U-Boot in RAM */
+	phys_size_t	ram_size;	/* RAM size */
+	unsigned long	mon_len;	/* monitor len */
+	unsigned long	irq_sp;		/* irq stack pointer */
+	unsigned long	start_addr_sp;	/* start_addr_stackpointer */
+	unsigned long	reloc_off;
+#if !(defined(CONFIG_SYS_ICACHE_OFF) && defined(CONFIG_SYS_DCACHE_OFF))
+	unsigned long	tlb_addr;
+#endif
+	struct global_data *new_gd;	/* relocated global data */
+	const void	*fdt_blob;	/* Our device tree, NULL if none */
+	void		**jt;		/* jump table */
+	char		env_buf[32];	/* buffer for getenv() before reloc. */
+#if defined(CONFIG_POST) || defined(CONFIG_LOGBUFFER)
+	unsigned long	post_log_word; /* Record POST activities */
+	unsigned long	post_log_res; /* success of POST test */
+	unsigned long	post_init_f_time; /* When post_init_f started */
+#endif
+} gd_t;
+#endif
+
+/*
+ * Global Data Flags
+ */
+#define	GD_FLG_RELOC		0x00001	/* Code was relocated to RAM	   */
+#define	GD_FLG_DEVINIT		0x00002	/* Devices have been initialized   */
+#define	GD_FLG_SILENT		0x00004	/* Silent mode			   */
+#define	GD_FLG_POSTFAIL		0x00008	/* Critical POST test failed	   */
+#define	GD_FLG_POSTSTOP		0x00010	/* POST seqeunce aborted	   */
+#define	GD_FLG_LOGINIT		0x00020	/* Log Buffer has been initialized */
+#define GD_FLG_DISABLE_CONSOLE	0x00040	/* Disable console (in & out)	   */
+#define GD_FLG_ENV_READY	0x00080	/* Env. imported into hash table   */
+
+/* ARM uses r8 to hold the global data pointer */
+#ifdef CONFIG_ARM
+#define DECLARE_GLOBAL_DATA_PTR     register volatile gd_t *gd asm ("r8")
+
+#else /* All other architectures */
+
+#define XTRN_DECLARE_GLOBAL_DATA_PTR    extern
+#define DECLARE_GLOBAL_DATA_PTR     XTRN_DECLARE_GLOBAL_DATA_PTR gd_t *gd
+#endif
+
+#endif /* __ASM_GENERIC_GBL_DATA_H */
-- 
1.7.3.1