common: env: support sata device

Introduce env support for sata device.
1. Implement write_env/read_env/env_relocate_spec/saveenv/sata_get_env_dev
2. If want to enable this feature, define CONFIG_ENV_IS_IN_SATA, and
   define CONFIG_SYS_SATA_ENV_DEV or implement your own sata_get_ev_dev.

Signed-off-by: Peng Fan <van.freenix@gmail.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Joe Hershberger <joe.hershberger@ni.com>
Cc: Bin Meng <bmeng.cn@gmail.com>
Cc: Stefan Roese <sr@denx.de>
Cc: Heiko Schocher <hs@denx.de>
Cc: Stuart Longland <stuartl@vrt.com.au>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Tom Rini <trini@konsulko.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

2 files changed, 128 insertions, 0 deletions

diff --git a/common/Makefile b/common/Makefile
index 9a4b817..b23f312 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -50,6 +50,7 @@ obj-$(CONFIG_ENV_IS_IN_EXT4) += env_ext4.o
 obj-$(CONFIG_ENV_IS_IN_NAND) += env_nand.o
 obj-$(CONFIG_ENV_IS_IN_NVRAM) += env_nvram.o
 obj-$(CONFIG_ENV_IS_IN_ONENAND) += env_onenand.o
+obj-$(CONFIG_ENV_IS_IN_SATA) += env_sata.o
 obj-$(CONFIG_ENV_IS_IN_SPI_FLASH) += env_sf.o
 obj-$(CONFIG_ENV_IS_IN_REMOTE) += env_remote.o
 obj-$(CONFIG_ENV_IS_IN_UBI) += env_ubi.o
diff --git a/common/env_sata.c b/common/env_sata.c
new file mode 100644
index 0000000..b0cee35
--- /dev/null
+++ b/common/env_sata.c
@@ -0,0 +1,127 @@
+/*
+ * (C) Copyright 2010-2016 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+/* #define DEBUG */
+
+#include <common.h>
+
+#include <command.h>
+#include <environment.h>
+#include <linux/stddef.h>
+#include <errno.h>
+#include <memalign.h>
+#include <sata.h>
+#include <search.h>
+
+#if defined(CONFIG_ENV_SIZE_REDUND) || defined(CONFIG_ENV_OFFSET_REDUND)
+#error ENV REDUND not supported
+#endif
+
+#if !defined(CONFIG_ENV_OFFSET) || !defined(CONFIG_ENV_SIZE)
+#error CONFIG_ENV_OFFSET or CONFIG_ENV_SIZE not defined
+#endif
+
+char *env_name_spec = "SATA";
+
+DECLARE_GLOBAL_DATA_PTR;
+
+__weak int sata_get_env_dev(void)
+{
+	return CONFIG_SYS_SATA_ENV_DEV;
+}
+
+int env_init(void)
+{
+	/* use default */
+	gd->env_addr = (ulong)&default_environment[0];
+	gd->env_valid = 1;
+
+	return 0;
+}
+
+#ifdef CONFIG_CMD_SAVEENV
+static inline int write_env(struct blk_desc *sata, unsigned long size,
+			    unsigned long offset, void *buffer)
+{
+	uint blk_start, blk_cnt, n;
+
+	blk_start = ALIGN(offset, sata->blksz) / sata->blksz;
+	blk_cnt   = ALIGN(size, sata->blksz) / sata->blksz;
+
+	n = blk_dwrite(sata, blk_start, blk_cnt, buffer);
+
+	return (n == blk_cnt) ? 0 : -1;
+}
+
+int saveenv(void)
+{
+	ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
+	struct blk_desc *sata = NULL;
+	int env_sata, ret;
+
+	if (sata_initialize())
+		return 1;
+
+	env_sata = sata_get_env_dev();
+
+	sata = sata_get_dev(env_sata);
+	if (sata == NULL) {
+		printf("Unknown SATA(%d) device for environment!\n",
+		       env_sata);
+		return 1;
+	}
+
+	ret = env_export(env_new);
+	if (ret)
+		return 1;
+
+	printf("Writing to SATA(%d)...", env_sata);
+	if (write_env(sata, CONFIG_ENV_SIZE, CONFIG_ENV_OFFSET, &env_new)) {
+		puts("failed\n");
+		return 1;
+	}
+
+	puts("done\n");
+	return 0;
+}
+#endif /* CONFIG_CMD_SAVEENV */
+
+static inline int read_env(struct blk_desc *sata, unsigned long size,
+			   unsigned long offset, void *buffer)
+{
+	uint blk_start, blk_cnt, n;
+
+	blk_start = ALIGN(offset, sata->blksz) / sata->blksz;
+	blk_cnt   = ALIGN(size, sata->blksz) / sata->blksz;
+
+	n = blk_dread(sata, blk_start, blk_cnt, buffer);
+
+	return (n == blk_cnt) ? 0 : -1;
+}
+
+void env_relocate_spec(void)
+{
+	ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
+	struct blk_desc *sata = NULL;
+	int env_sata;
+
+	if (sata_initialize())
+		return;
+
+	env_sata = sata_get_env_dev();
+
+	sata = sata_get_dev(env_sata);
+	if (sata == NULL) {
+		printf("Unknown SATA(%d) device for environment!\n",
+		       env_sata);
+		return;
+	}
+
+	if (read_env(sata, CONFIG_ENV_SIZE, CONFIG_ENV_OFFSET, buf))
+		return set_default_env(NULL);
+
+	env_import(buf, 1);
+}