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Date: Sun, 13 Dec 2015 22:45:30 +0000
From: Simon Arlott <simon@...e.lp0.eu>
To: Ralf Baechle <ralf@...ux-mips.org>,
David Woodhouse <dwmw2@...radead.org>,
Brian Norris <computersforpeace@...il.com>,
Kevin Cernekee <cernekee@...il.com>,
Florian Fainelli <f.fainelli@...il.com>,
Jonas Gorski <jogo@...nwrt.org>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
MIPS Mailing List <linux-mips@...ux-mips.org>,
MTD Maling List <linux-mtd@...ts.infradead.org>
Subject: [PATCH linux-next v4 01/11] MIPS: bcm963xx: Add Broadcom BCM963xx
board nvram data structure
Broadcom BCM963xx boards have multiple nvram variants across different
SoCs with additional checksum fields added whenever the size of the
nvram was extended.
Add this structure as a header file so that multiple drivers can use it.
Signed-off-by: Simon Arlott <simon@...e.lp0.eu>
---
v4: Move out of uapi.
Add nand offset/size functions/macros.
Add checksum calculation function.
v3: Fix includes/type names, add comments explaining the nvram struct.
v2: Use external struct bcm963xx_nvram definition for bcm963268part.
MAINTAINERS | 1 +
include/linux/bcm963xx_nvram.h | 112 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 113 insertions(+)
create mode 100644 include/linux/bcm963xx_nvram.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 31fc0bf..ac7de1a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2391,6 +2391,7 @@ F: arch/mips/kernel/*bmips*
F: arch/mips/boot/dts/brcm/bcm*.dts*
F: drivers/irqchip/irq-bcm7*
F: drivers/irqchip/irq-brcmstb*
+F: include/linux/bcm963xx_nvram.h
BROADCOM TG3 GIGABIT ETHERNET DRIVER
M: Prashant Sreedharan <prashant@...adcom.com>
diff --git a/include/linux/bcm963xx_nvram.h b/include/linux/bcm963xx_nvram.h
new file mode 100644
index 0000000..290c231
--- /dev/null
+++ b/include/linux/bcm963xx_nvram.h
@@ -0,0 +1,112 @@
+#ifndef __LINUX_BCM963XX_NVRAM_H__
+#define __LINUX_BCM963XX_NVRAM_H__
+
+#include <linux/crc32.h>
+#include <linux/if_ether.h>
+#include <linux/sizes.h>
+#include <linux/types.h>
+
+/*
+ * Broadcom BCM963xx SoC board nvram data structure.
+ *
+ * The nvram structure varies in size depending on the SoC board version. Use
+ * the appropriate minimum BCM963XX_NVRAM_*_SIZE define for the information
+ * you need instead of sizeof(struct bcm963xx_nvram) as this may change.
+ */
+
+#define BCM963XX_NVRAM_V4_SIZE 300
+#define BCM963XX_NVRAM_V5_SIZE (1 * SZ_1K)
+
+#define BCM963XX_DEFAULT_PSI_SIZE 64
+
+enum bcm963xx_nvram_nand_part {
+ BCM963XX_NVRAM_NAND_PART_BOOT = 0,
+ BCM963XX_NVRAM_NAND_PART_ROOTFS_1,
+ BCM963XX_NVRAM_NAND_PART_ROOTFS_2,
+ BCM963XX_NVRAM_NAND_PART_DATA,
+ BCM963XX_NVRAM_NAND_PART_BBT,
+
+ __BCM963XX_NVRAM_NAND_NR_PARTS
+};
+
+struct bcm963xx_nvram {
+ u32 version;
+ char bootline[256];
+ char name[16];
+ u32 main_tp_number;
+ u32 psi_size;
+ u32 mac_addr_count;
+ u8 mac_addr_base[ETH_ALEN];
+ u8 __reserved1[2];
+ u32 checksum_v4;
+
+ u8 __reserved2[292];
+ u32 nand_part_offset[__BCM963XX_NVRAM_NAND_NR_PARTS];
+ u32 nand_part_size[__BCM963XX_NVRAM_NAND_NR_PARTS];
+ u8 __reserved3[388];
+ u32 checksum_v5;
+};
+
+#define BCM963XX_NVRAM_NAND_PART_OFFSET(nvram, part) \
+ bcm963xx_nvram_nand_part_offset(nvram, BCM963XX_NVRAM_NAND_PART_ ##part)
+
+static inline u64 __pure bcm963xx_nvram_nand_part_offset(
+ const struct bcm963xx_nvram *nvram,
+ enum bcm963xx_nvram_nand_part part)
+{
+ return nvram->nand_part_offset[part] * SZ_1K;
+}
+
+#define BCM963XX_NVRAM_NAND_PART_SIZE(nvram, part) \
+ bcm963xx_nvram_nand_part_size(nvram, BCM963XX_NVRAM_NAND_PART_ ##part)
+
+static inline u64 __pure bcm963xx_nvram_nand_part_size(
+ const struct bcm963xx_nvram *nvram,
+ enum bcm963xx_nvram_nand_part part)
+{
+ return nvram->nand_part_size[part] * SZ_1K;
+}
+
+/*
+ * bcm963xx_nvram_checksum - Verify nvram checksum
+ *
+ * @nvram: pointer to full size nvram data structure
+ * @expected_out: optional pointer to store expected checksum value
+ * @actual_out: optional pointer to store actual checksum value
+ *
+ * Return: 0 if the checksum is valid, otherwise -EINVAL
+ */
+static int __maybe_unused bcm963xx_nvram_checksum(
+ const struct bcm963xx_nvram *nvram,
+ u32 *expected_out, u32 *actual_out)
+{
+ u32 expected, actual;
+ size_t len;
+
+ if (nvram->version <= 4) {
+ expected = nvram->checksum_v4;
+ len = BCM963XX_NVRAM_V4_SIZE - sizeof(u32);
+ } else {
+ expected = nvram->checksum_v5;
+ len = BCM963XX_NVRAM_V5_SIZE - sizeof(u32);
+ }
+
+ /*
+ * Calculate the CRC32 value for the nvram with a checksum value
+ * of 0 without modifying or copying the nvram by combining:
+ * - The CRC32 of the nvram without the checksum value
+ * - The CRC32 of a zero checksum value (which is also 0)
+ */
+ actual = crc32_le_combine(
+ crc32_le(~0, (u8 *)nvram, len), 0, sizeof(u32));
+
+ if (expected_out)
+ *expected_out = expected;
+
+ if (actual_out)
+ *actual_out = actual;
+
+ return expected == actual ? 0 : -EINVAL;
+};
+
+#endif /* __LINUX_BCM963XX_NVRAM_H__ */
--
2.1.4
--
Simon Arlott
--
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