powerpc/corenet_ds: Slave reads ENV from master when boot from SRIO

When boot from SRIO, slave's ENV can be stored in master's memory space,
then slave can fetch the ENV through SRIO interface.

NOTE: Because the slave can not erase, write master's NOR flash by SRIO
	  interface, so it can not modify the ENV parameters stored in
	  master's NOR flash using "saveenv" or other commands.

Master needs to:
	1. Put the slave's ENV into it's own memory space.
	2. Set an inbound SRIO window covered slave's ENV stored in master's
	   memory space.
Slave needs to:
	1. Set a specific TLB entry in order to fetch ucode and ENV from master.
	2. Set a LAW entry with the TargetID SRIO1 or SRIO2 for ucode and ENV.

Signed-off-by: Liu Gang <Gang.Liu@freescale.com>
Signed-off-by: Shaohui Xie <Shaohui.Xie@freescale.com>

README

@@ -3026,6 +3026,24 @@ to save the current settings.
 	  environment area within the total memory of your DataFlash placed
 	  at the specified address.
 
+- CONFIG_ENV_IS_IN_REMOTE:
+
+	Define this if you have a remote memory space which you
+	want to use for the local device's environment.
+
+	- CONFIG_ENV_ADDR:
+	- CONFIG_ENV_SIZE:
+
+	  These two #defines specify the address and size of the
+	  environment area within the remote memory space. The
+	  local device can get the environment from remote memory
+	  space by SRIO or other links.
+
+BE CAREFUL! For some special cases, the local device can not use
+"saveenv" command. For example, the local device will get the
+environment stored in a remote NOR flash by SRIO link, but it can
+not erase, write this NOR flash by SRIO interface.
+
 - CONFIG_ENV_IS_IN_NAND:
 
 	Define this if you have a NAND device which you want to use

arch/powerpc/cpu/mpc8xxx/srio.c

@@ -150,5 +150,22 @@ void srio_boot_master(void)
 			.port[CONFIG_SRIOBOOT_MASTER_PORT].inbw[2].riwar,
 			SRIO_IB_ATMU_AR
 			| atmu_size_mask(CONFIG_SRIOBOOT_SLAVE_UCODE_SIZE));
+
+	/* configure inbound window for slave's ENV */
+	debug("SRIOBOOT - MASTER: Inbound window for slave's ENV; "
+			"Local = 0x%llx, Siro = 0x%llx, Size = 0x%x\n",
+			CONFIG_SRIOBOOT_SLAVE_ENV_LAW_PHYS,
+			CONFIG_SRIOBOOT_SLAVE_ENV_SRIO_PHYS,
+			CONFIG_SRIOBOOT_SLAVE_ENV_SIZE);
+	out_be32((void *)&srio->atmu
+			.port[CONFIG_SRIOBOOT_MASTER_PORT].inbw[3].riwtar,
+			CONFIG_SRIOBOOT_SLAVE_ENV_LAW_PHYS >> 12);
+	out_be32((void *)&srio->atmu
+			.port[CONFIG_SRIOBOOT_MASTER_PORT].inbw[3].riwbar,
+			CONFIG_SRIOBOOT_SLAVE_ENV_SRIO_PHYS >> 12);
+	out_be32((void *)&srio->atmu
+			.port[CONFIG_SRIOBOOT_MASTER_PORT].inbw[3].riwar,
+			SRIO_IB_ATMU_AR
+			| atmu_size_mask(CONFIG_SRIOBOOT_SLAVE_ENV_SIZE));
 }
 #endif

common/Makefile

@@ -59,6 +59,7 @@ COBJS-$(CONFIG_ENV_IS_IN_NAND) += env_nand.o
 COBJS-$(CONFIG_ENV_IS_IN_NVRAM) += env_nvram.o
 COBJS-$(CONFIG_ENV_IS_IN_ONENAND) += env_onenand.o
 COBJS-$(CONFIG_ENV_IS_IN_SPI_FLASH) += env_sf.o
+COBJS-$(CONFIG_ENV_IS_IN_REMOTE) += env_remote.o
 COBJS-$(CONFIG_ENV_IS_NOWHERE) += env_nowhere.o
 
 # command

common/cmd_nvedit.c

@@ -66,9 +66,10 @@ DECLARE_GLOBAL_DATA_PTR;
 	!defined(CONFIG_ENV_IS_IN_NVRAM)	&& \
 	!defined(CONFIG_ENV_IS_IN_ONENAND)	&& \
 	!defined(CONFIG_ENV_IS_IN_SPI_FLASH)	&& \
+	!defined(CONFIG_ENV_IS_IN_REMOTE)	&& \
 	!defined(CONFIG_ENV_IS_NOWHERE)
 # error Define one of CONFIG_ENV_IS_IN_{EEPROM|FLASH|DATAFLASH|ONENAND|\
-SPI_FLASH|MG_DISK|NVRAM|MMC|FAT} or CONFIG_ENV_IS_NOWHERE
+SPI_FLASH|MG_DISK|NVRAM|MMC|FAT|REMOTE} or CONFIG_ENV_IS_NOWHERE
 #endif
 
 #define XMK_STR(x)	#x

common/env_remote.c

@@ -0,0 +1,79 @@
+/*
+ * (C) Copyright 2011-2012 Freescale Semiconductor, Inc.
+ *
+ * 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
+ */
+
+/* #define DEBUG */
+
+#include <common.h>
+#include <command.h>
+#include <environment.h>
+#include <linux/stddef.h>
+
+char *env_name_spec = "Remote";
+
+#ifdef ENV_IS_EMBEDDED
+env_t *env_ptr = &environment;
+#else /* ! ENV_IS_EMBEDDED */
+env_t *env_ptr = (env_t *)CONFIG_ENV_ADDR;
+#endif /* ENV_IS_EMBEDDED */
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#if !defined(CONFIG_ENV_OFFSET)
+#define CONFIG_ENV_OFFSET 0
+#endif
+
+uchar env_get_char_spec(int index)
+{
+	return *((uchar *)(gd->env_addr + index));
+}
+
+int env_init(void)
+{
+	if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
+		gd->env_addr = (ulong)&(env_ptr->data);
+		gd->env_valid = 1;
+		return 0;
+	}
+
+	gd->env_addr = (ulong)default_environment;
+	gd->env_valid = 0;
+	return 0;
+}
+
+#ifdef CONFIG_CMD_SAVEENV
+int saveenv(void)
+{
+#ifdef CONFIG_SRIOBOOT_SLAVE
+	printf("Can not support the 'saveenv' when boot from SRIO!\n");
+	return 1;
+#else
+	return 0;
+#endif
+}
+#endif /* CONFIG_CMD_SAVEENV */
+
+void env_relocate_spec(void)
+{
+#ifndef ENV_IS_EMBEDDED
+	env_import((char *)env_ptr, 1);
+#endif
+}

include/configs/corenet_ds.h

@@ -77,7 +77,9 @@
 #define CONFIG_ENV_OVERWRITE
 
 #ifdef CONFIG_SYS_NO_FLASH
+#ifndef CONFIG_SRIOBOOT_SLAVE
 #define CONFIG_ENV_IS_NOWHERE
+#endif
 #else
 #define CONFIG_FLASH_CFI_DRIVER
 #define CONFIG_SYS_FLASH_CFI
@@ -106,6 +108,10 @@
 #define CONFIG_ENV_IS_IN_NAND
 #define CONFIG_ENV_SIZE			CONFIG_SYS_NAND_BLOCK_SIZE
 #define CONFIG_ENV_OFFSET		(5 * CONFIG_SYS_NAND_BLOCK_SIZE)
+#elif defined(CONFIG_SRIOBOOT_SLAVE)
+#define CONFIG_ENV_IS_IN_REMOTE
+#define CONFIG_ENV_ADDR		0xffe20000
+#define CONFIG_ENV_SIZE		0x2000
 #elif defined(CONFIG_ENV_IS_NOWHERE)
 #define CONFIG_ENV_SIZE		0x2000
 #else
@@ -406,6 +412,13 @@
 #define CONFIG_SRIOBOOT_SLAVE_UCODE_LAW_PHYS 0xfef020000ull
 #define CONFIG_SRIOBOOT_SLAVE_UCODE_SRIO_PHYS 0x3ffe00000ull
 #define CONFIG_SRIOBOOT_SLAVE_UCODE_SIZE 0x10000	/* 64K */
+/*
+ * for slave ENV instored in master memory space,
+ * PHYS must be aligned based on the SIZE
+ */
+#define CONFIG_SRIOBOOT_SLAVE_ENV_LAW_PHYS 0xfef060000ull
+#define CONFIG_SRIOBOOT_SLAVE_ENV_SRIO_PHYS 0x3ffe20000ull
+#define CONFIG_SRIOBOOT_SLAVE_ENV_SIZE 0x20000	/* 128K */
 #endif
 
 /*