[Skiboot] [RFC, PATCH 2/3] core/flash: port pnor_load_resource to flash code

[Jeremy Kerr]

Since we have a flash device registered as the system flash, use this as
a generic load_resource backend.

Signed-off-by: Jeremy Kerr <jk at ozlabs.org>

---
 core/flash.c                |   78 ++++++++++++++++++++++++++++++++++++
 platforms/astbmc/astbmc.h   |    1 
 platforms/astbmc/habanero.c |    2 
 platforms/astbmc/palmetto.c |    2 
 platforms/astbmc/pnor.c     |   54 ------------------------
 5 files changed, 80 insertions(+), 57 deletions(-)

diff --git a/core/flash.c b/core/flash.c
index 4a4198d..e68b41e 100644
--- a/core/flash.c
+++ b/core/flash.c
@@ -218,3 +218,81 @@ static int64_t opal_flash_erase(uint64_t id, uint64_t offset, uint64_t size,
 opal_call(OPAL_FLASH_READ, opal_flash_read, 5);
 opal_call(OPAL_FLASH_WRITE, opal_flash_write, 5);
 opal_call(OPAL_FLASH_WRITE, opal_flash_erase, 4);
+
+/* flash resource API */
+
+static const struct {
+	enum resource_id id;
+	char name[PART_NAME_MAX+1];
+} part_name_map[] = {
+	{ RESOURCE_ID_KERNEL, "KERNEL" },
+	{ RESOURCE_ID_INITRAMFS, "ROOTFS" },
+};
+
+bool flash_load_resource(enum resource_id id, void *buf, size_t *len)
+{
+	int i, rc, part_num, part_size, part_start;
+	struct ffs_handle *ffs;
+	struct flash *flash;
+	const char *name;
+	bool status;
+
+	status = false;
+
+	lock(&flash_lock);
+
+	if (!system_flash)
+		goto out_unlock;
+
+	flash = system_flash;
+
+	for (i = 0, name = NULL; i < ARRAY_SIZE(part_name_map); i++) {
+		if (part_name_map[i].id == id) {
+			name = part_name_map[i].name;
+			break;
+		}
+	}
+	if (!name) {
+		prerror("FLASH: Couldn't find partition for id %d\n", id);
+		goto out_unlock;
+	}
+
+	rc = ffs_open_flash(flash->chip, 0, flash->size, &ffs);
+	if (rc) {
+		prerror("FLASH: Can't open ffs handle\n");
+		goto out_unlock;
+	}
+
+	rc = ffs_lookup_part(ffs, name, &part_num);
+	if (rc) {
+		prerror("FLASH: No %s partition\n", name);
+		goto out_free_ffs;
+	}
+	rc = ffs_part_info(ffs, part_num, NULL,
+			   &part_start, &part_size, NULL);
+	if (rc) {
+		prerror("FLASH: Failed to get %s partition info\n", name);
+		goto out_free_ffs;
+	}
+
+	if (part_size > *len) {
+		prerror("FLASH: %s image too large (%d > %zd)\n", name,
+			part_size, *len);
+		goto out_free_ffs;
+	}
+
+	rc = flash_read(flash->chip, part_start, buf, part_size);
+	if (rc) {
+		prerror("FLASH: failed to read %s partition\n", name);
+		goto out_free_ffs;
+	}
+
+	*len = part_size;
+	status = true;
+
+out_free_ffs:
+	ffs_close(ffs);
+out_unlock:
+	unlock(&flash_lock);
+	return status;
+}
diff --git a/platforms/astbmc/astbmc.h b/platforms/astbmc/astbmc.h
index 7e33f61..cee475a 100644
--- a/platforms/astbmc/astbmc.h
+++ b/platforms/astbmc/astbmc.h
@@ -24,6 +24,5 @@ extern int64_t astbmc_ipmi_power_down(uint64_t request);
 extern void astbmc_init(void);
 extern void astbmc_ext_irq(unsigned int chip_id);
 extern int pnor_init(void);
-extern bool pnor_load_resource(enum resource_id id, void *buf, size_t *len);
 
 #endif /* __ASTBMC_H */
diff --git a/platforms/astbmc/habanero.c b/platforms/astbmc/habanero.c
index a19aafd..0ec867f 100644
--- a/platforms/astbmc/habanero.c
+++ b/platforms/astbmc/habanero.c
@@ -49,5 +49,5 @@ DECLARE_PLATFORM(habanero) = {
 	.external_irq		= astbmc_ext_irq,
 	.cec_power_down         = astbmc_ipmi_power_down,
 	.cec_reboot             = astbmc_ipmi_reboot,
-	.load_resource		= pnor_load_resource,
+	.load_resource		= flash_load_resource,
 };
diff --git a/platforms/astbmc/palmetto.c b/platforms/astbmc/palmetto.c
index cfa7236..ff8d8ec 100644
--- a/platforms/astbmc/palmetto.c
+++ b/platforms/astbmc/palmetto.c
@@ -51,5 +51,5 @@ DECLARE_PLATFORM(palmetto) = {
 	.cec_power_down         = astbmc_ipmi_power_down,
 	.cec_reboot             = astbmc_ipmi_reboot,
 	.elog_commit		= ipmi_elog_commit,
-	.load_resource		= pnor_load_resource,
+	.load_resource		= flash_load_resource,
 };
diff --git a/platforms/astbmc/pnor.c b/platforms/astbmc/pnor.c
index 2cdb29b..c56ac63 100644
--- a/platforms/astbmc/pnor.c
+++ b/platforms/astbmc/pnor.c
@@ -84,58 +84,4 @@ int pnor_init(void)
 	return rc;
 }
 
-static const struct {
-	enum resource_id id;
-	char name[PART_NAME_MAX+1];
-} part_name_map[] = {
-	{ RESOURCE_ID_KERNEL, "KERNEL" },
-	{ RESOURCE_ID_INITRAMFS, "ROOTFS" },
-};
 
-bool pnor_load_resource(enum resource_id id, void *buf, size_t *len)
-{
-	int i, rc, part_num, part_size, part_start;
-	const char *name;
-
-	if (!pnor_ffs || !pnor_chip)
-		return false;
-
-	for (i = 0, name = NULL; i < ARRAY_SIZE(part_name_map); i++) {
-		if (part_name_map[i].id == id) {
-			name = part_name_map[i].name;
-			break;
-		}
-	}
-	if (!name) {
-		prerror("PLAT: Couldn't find partition for id %d\n", id);
-		return false;
-	}
-
-	rc = ffs_lookup_part(pnor_ffs, name, &part_num);
-	if (rc) {
-		prerror("PLAT: No %s partition in PNOR\n", name);
-		return false;
-	}
-	rc = ffs_part_info(pnor_ffs, part_num, NULL,
-			   &part_start, &part_size, NULL);
-	if (rc) {
-		prerror("PLAT: Failed to get %s partition info\n", name);
-		return false;
-	}
-
-	if (part_size > *len) {
-		prerror("PLAT: %s image too large (%d > %zd)\n", name,
-			part_size, *len);
-		return false;
-	}
-
-	rc = flash_read(pnor_chip, part_start, buf, part_size);
-	if (rc) {
-		prerror("PLAT: failed to read %s partition\n", name);
-		return false;
-	}
-
-	*len = part_size;
-
-	return true;
-}