linux-kernel - [PATCH v3] mtd: parsers: bcm63xx: simplify CFE detection

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Message-Id: <20200612073549.1658336-1-noltari@gmail.com>
Date:   Fri, 12 Jun 2020 09:35:49 +0200
From:   Álvaro Fernández Rojas 
        <noltari@...il.com>
To:     tsbogend@...ha.franken.de, f.fainelli@...il.com,
        bcm-kernel-feedback-list@...adcom.com, miquel.raynal@...tlin.com,
        richard@....at, vigneshr@...com, jonas.gorski@...il.com,
        linus.walleij@...aro.org, linux-mips@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mtd@...ts.infradead.org
Cc:     Álvaro Fernández Rojas 
        <noltari@...il.com>
Subject: [PATCH v3] mtd: parsers: bcm63xx: simplify CFE detection

Instead of trying to parse CFE version string, which is customized by some
vendors, let's just check that "CFE1" was passed on argument 3.

Signed-off-by: Álvaro Fernández Rojas <noltari@...il.com>
Signed-off-by: Jonas Gorski <jonas.gorski@...il.com>
---
 v3: keep COMPILE_TEST compatibility by adding a new function that only checks
     fw_arg3 when CONFIG_MIPS is defined.
 v2: use CFE_EPTSEAL definition and avoid using an additional function.

 drivers/mtd/parsers/bcm63xxpart.c | 34 +++++++++++--------------------
 1 file changed, 12 insertions(+), 22 deletions(-)

diff --git a/drivers/mtd/parsers/bcm63xxpart.c b/drivers/mtd/parsers/bcm63xxpart.c
index 78f90c6c18fd..c514c04789af 100644
--- a/drivers/mtd/parsers/bcm63xxpart.c
+++ b/drivers/mtd/parsers/bcm63xxpart.c
@@ -22,6 +22,11 @@
 #include <linux/mtd/partitions.h>
 #include <linux/of.h>
 
+#ifdef CONFIG_MIPS
+#include <asm/bootinfo.h>
+#include <asm/fw/cfe/cfe_api.h>
+#endif /* CONFIG_MIPS */
+
 #define BCM963XX_CFE_BLOCK_SIZE		SZ_64K	/* always at least 64KiB */
 
 #define BCM963XX_CFE_MAGIC_OFFSET	0x4e0
@@ -32,28 +37,13 @@
 #define STR_NULL_TERMINATE(x) \
 	do { char *_str = (x); _str[sizeof(x) - 1] = 0; } while (0)
 
-static int bcm63xx_detect_cfe(struct mtd_info *master)
+static inline int bcm63xx_detect_cfe(void)
 {
-	char buf[9];
-	int ret;
-	size_t retlen;
-
-	ret = mtd_read(master, BCM963XX_CFE_VERSION_OFFSET, 5, &retlen,
-		       (void *)buf);
-	buf[retlen] = 0;
-
-	if (ret)
-		return ret;
-
-	if (strncmp("cfe-v", buf, 5) == 0)
-		return 0;
-
-	/* very old CFE's do not have the cfe-v string, so check for magic */
-	ret = mtd_read(master, BCM963XX_CFE_MAGIC_OFFSET, 8, &retlen,
-		       (void *)buf);
-	buf[retlen] = 0;
-
-	return strncmp("CFE1CFE1", buf, 8);
+#ifdef CONFIG_MIPS
+	return (fw_arg3 == CFE_EPTSEAL);
+#else
+	return 0;
+#endif /* CONFIG_MIPS */
 }
 
 static int bcm63xx_read_nvram(struct mtd_info *master,
@@ -138,7 +128,7 @@ static int bcm63xx_parse_cfe_partitions(struct mtd_info *master,
 	struct bcm963xx_nvram *nvram = NULL;
 	int ret;
 
-	if (bcm63xx_detect_cfe(master))
+	if (!bcm63xx_detect_cfe())
 		return -EINVAL;
 
 	nvram = vzalloc(sizeof(*nvram));
-- 
2.26.2