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>

diff --git a/README b/README
index da15105617eb0a6ad58f906d087e9f8ab6a0d148..a0536a4b597870d936d9b27a6b9b2d1fb6a43f1d 100644 (file)
--- a/README
+++ b/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

diff --git a/arch/powerpc/cpu/mpc8xxx/srio.c b/arch/powerpc/cpu/mpc8xxx/srio.c
index e593f22b1069b4464c76f0c3d0ed76dfaab168ab..5694561eba54615d3454a0a800b667d15b484a5b 100644 (file)
--- a/arch/powerpc/cpu/mpc8xxx/srio.c
+++ b/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

diff --git a/common/Makefile b/common/Makefile
index d9f10f3f6e86c8ed291436643a150360dd1a5448..6e23baaf6144274193a892bce44d57fbbd5cbb3c 100644 (file)
--- a/common/Makefile
+++ b/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

diff --git a/common/cmd_nvedit.c b/common/cmd_nvedit.c
index b1494dcb0ce698a89545a0e35fc283074bd34fd6..e1ccdd8f7e23a96c08242816e9e918f24ad9744c 100644 (file)
--- a/common/cmd_nvedit.c
+++ b/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

diff --git a/common/env_remote.c b/common/env_remote.c
new file mode 100644 (file)
index 0000000..3bf0f95
--- /dev/null
+++ b/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
+}

diff --git a/include/configs/corenet_ds.h b/include/configs/corenet_ds.h
index 093c2c04b120b263c352b4622601085b00ee3d9a..aa8b384d669aa9091819a79e1f9bbf6b8f5f1efb 100644 (file)
--- a/include/configs/corenet_ds.h
+++ b/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
 
 /*