linux-kernel - [PATCH 2/2] mfd: intel-m10-bmc: add access table configuration to the regmap

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Message-Id: <1611110081-10056-2-git-send-email-yilun.xu@intel.com>
Date:   Wed, 20 Jan 2021 10:34:41 +0800
From:   Xu Yilun <yilun.xu@...el.com>
To:     lee.jones@...aro.org, linux-kernel@...r.kernel.org
Cc:     trix@...hat.com, yilun.xu@...el.com,
        matthew.gerlach@...ux.intel.com, russell.h.weight@...el.com,
        lgoncalv@...hat.com, hao.wu@...el.com
Subject: [PATCH 2/2] mfd: intel-m10-bmc: add access table configuration to the regmap

From: Matthew Gerlach <matthew.gerlach@...ux.intel.com>

This patch adds access tables to the MAX 10 BMC regmap. This prevents
the host from accessing the unwanted I/O space. It also filters out the
invalid outputs when reading the regmap debugfs interface.

Signed-off-by: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
Signed-off-by: Xu Yilun <yilun.xu@...el.com>
---
 drivers/mfd/intel-m10-bmc.c       | 14 ++++++++++++++
 include/linux/mfd/intel-m10-bmc.h |  5 ++++-
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/mfd/intel-m10-bmc.c b/drivers/mfd/intel-m10-bmc.c
index b84579b..0ae3053 100644
--- a/drivers/mfd/intel-m10-bmc.c
+++ b/drivers/mfd/intel-m10-bmc.c
@@ -23,10 +23,24 @@ static struct mfd_cell m10bmc_pacn3000_subdevs[] = {
 	{ .name = "n3000bmc-secure" },
 };
 
+static const struct regmap_range m10bmc_regmap_range[] = {
+	regmap_reg_range(M10BMC_LEGACY_SYS_BASE + M10BMC_BUILD_VER,
+			 M10BMC_LEGACY_SYS_BASE + M10BMC_BUILD_VER),
+	regmap_reg_range(M10BMC_SYS_BASE, M10BMC_SYS_END),
+	regmap_reg_range(M10BMC_FLASH_BASE, M10BMC_FLASH_END),
+};
+
+static const struct regmap_access_table m10bmc_access_table = {
+	.yes_ranges	= m10bmc_regmap_range,
+	.n_yes_ranges	= ARRAY_SIZE(m10bmc_regmap_range),
+};
+
 static struct regmap_config intel_m10bmc_regmap_config = {
 	.reg_bits = 32,
 	.val_bits = 32,
 	.reg_stride = 4,
+	.wr_table = &m10bmc_access_table,
+	.rd_table = &m10bmc_access_table,
 	.max_register = M10BMC_MEM_END,
 };
 
diff --git a/include/linux/mfd/intel-m10-bmc.h b/include/linux/mfd/intel-m10-bmc.h
index 06da62c..4ba88ed 100644
--- a/include/linux/mfd/intel-m10-bmc.h
+++ b/include/linux/mfd/intel-m10-bmc.h
@@ -11,7 +11,10 @@
 
 #define M10BMC_LEGACY_SYS_BASE		0x300400
 #define M10BMC_SYS_BASE			0x300800
-#define M10BMC_MEM_END			0x1fffffff
+#define M10BMC_SYS_END			0x300fff
+#define M10BMC_FLASH_BASE		0x10000000
+#define M10BMC_FLASH_END		0x1fffffff
+#define M10BMC_MEM_END			M10BMC_FLASH_END
 
 /* Register offset of system registers */
 #define NIOS2_FW_VERSION		0x0
-- 
2.7.4