Date:   Mon, 6 Jul 2020 17:28:13 +0800
From:   Neal Liu <neal.liu@...iatek.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>
CC:     Neal Liu <neal.liu@...iatek.com>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/2] soc: mediatek: devapc: add devapc-mt6779 driver

MT6779 bus frabric provides TrustZone security support and data
protection to prevent slaves from being accessed by unexpected
masters.
The security violations are logged and sent to the processor for
further analysis or countermeasures.

Any occurrence of security violation would raise an interrupt, and
it will be handled by devapc-mt6779 driver. The violation
information is printed in order to find the murderer.

Signed-off-by: Neal Liu <neal.liu@...iatek.com>
---
 drivers/soc/mediatek/Kconfig                |    6 +
 drivers/soc/mediatek/Makefile               |    1 +
 drivers/soc/mediatek/devapc/Kconfig         |   17 +
 drivers/soc/mediatek/devapc/Makefile        |   10 +
 drivers/soc/mediatek/devapc/devapc-mt6779.c | 1111 +++++++++++++++++++++++++++
 drivers/soc/mediatek/devapc/devapc-mt6779.h |   99 +++
 6 files changed, 1244 insertions(+)
 create mode 100644 drivers/soc/mediatek/devapc/Kconfig
 create mode 100644 drivers/soc/mediatek/devapc/Makefile
 create mode 100644 drivers/soc/mediatek/devapc/devapc-mt6779.c
 create mode 100644 drivers/soc/mediatek/devapc/devapc-mt6779.h

diff --git a/drivers/soc/mediatek/Kconfig b/drivers/soc/mediatek/Kconfig
index 59a56cd..2c9ad1f 100644
--- a/drivers/soc/mediatek/Kconfig
+++ b/drivers/soc/mediatek/Kconfig
@@ -51,4 +51,10 @@ config MTK_MMSYS
 	  Say yes here to add support for the MediaTek Multimedia
 	  Subsystem (MMSYS).
 
+menu "Security"
+
+source "drivers/soc/mediatek/devapc/Kconfig"
+
+endmenu # Security
+
 endmenu
diff --git a/drivers/soc/mediatek/Makefile b/drivers/soc/mediatek/Makefile
index 01f9f87..d6717a81 100644
--- a/drivers/soc/mediatek/Makefile
+++ b/drivers/soc/mediatek/Makefile
@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0-only
 obj-$(CONFIG_MTK_CMDQ) += mtk-cmdq-helper.o
+obj-$(CONFIG_MTK_DEVAPC) += devapc/
 obj-$(CONFIG_MTK_INFRACFG) += mtk-infracfg.o
 obj-$(CONFIG_MTK_PMIC_WRAP) += mtk-pmic-wrap.o
 obj-$(CONFIG_MTK_SCPSYS) += mtk-scpsys.o
diff --git a/drivers/soc/mediatek/devapc/Kconfig b/drivers/soc/mediatek/devapc/Kconfig
new file mode 100644
index 0000000..b0f7d0e
--- /dev/null
+++ b/drivers/soc/mediatek/devapc/Kconfig
@@ -0,0 +1,17 @@
+config MTK_DEVAPC
+	tristate "Mediatek Device APC Support"
+	help
+	  Device APC is a HW IP controlling internal device security.
+	  MediaTek bus frabric provides TrustZone security support and data
+	  protection to prevent slaves from being accessed by unexpected
+	  bus masters.
+	  Device APC prevents malicious access to internal devices.
+
+config DEVAPC_MT6779
+	tristate "Mediatek MT6779 Device APC driver"
+	select MTK_DEVAPC
+	help
+	  Say yes here to enable support Mediatek MT6779 Device APC driver.
+	  This driver mainly used to handle the violation with 1 DEVAPC AO/PDs.
+	  The violation information are logged for further analysis or
+	  countermeasures.
diff --git a/drivers/soc/mediatek/devapc/Makefile b/drivers/soc/mediatek/devapc/Makefile
new file mode 100644
index 0000000..0336c1d
--- /dev/null
+++ b/drivers/soc/mediatek/devapc/Makefile
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0
+
+ifeq ($(CONFIG_MTK_GCOV_KERNEL),y)
+GCOV_PROFILE := y
+endif
+
+obj-$(CONFIG_MTK_DEVAPC) := devapc.o
+
+# Platform
+devapc-$(CONFIG_DEVAPC_MT6779) += devapc-mt6779.o
diff --git a/drivers/soc/mediatek/devapc/devapc-mt6779.c b/drivers/soc/mediatek/devapc/devapc-mt6779.c
new file mode 100644
index 0000000..a28b9f3
--- /dev/null
+++ b/drivers/soc/mediatek/devapc/devapc-mt6779.c
@@ -0,0 +1,1111 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 MediaTek Inc.
+ */
+
+#include <linux/clk.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/of_irq.h>
+#include <linux/of_address.h>
+
+#include "devapc-mt6779.h"
+
+static struct mtk_device_info mt6779_devices_infra[] = {
+	/* sys_idx, ctrl_idx, vio_idx */
+	/* 0 */
+	{0, 0, 0},
+	{0, 1, 1},
+	{0, 2, 2},
+	{0, 3, 3},
+	{0, 4, 4},
+	{0, 5, 5},
+	{0, 6, 6},
+	{0, 7, 7},
+	{0, 8, 8},
+	{0, 9, 9},
+
+	/* 10 */
+	{0, 10, 10},
+	{0, 11, 11},
+	{0, 12, 12},
+	{0, 13, 13},
+	{0, 14, 14},
+	{0, 15, 15},
+	{0, 16, 16},
+	{0, 17, 17},
+	{0, 18, 18},
+	{0, 19, 19},
+
+	/* 20 */
+	{0, 20, 20},
+	{0, 21, 21},
+	{0, 22, 22},
+	{0, 23, 23},
+	{0, 24, 24},
+	{0, 25, 25},
+	{0, 26, 26},
+	{0, 27, 27},
+	{0, 28, 28},
+	{0, 29, 29},
+
+	/* 30 */
+	{0, 30, 30},
+	{0, 31, 31},
+	{0, 32, 32},
+	{0, 33, 77},
+	{0, 34, 78},
+	{0, 35, 79},
+	{0, 35, 80},
+	{0, 37, 37},
+	{0, 38, 38},
+	{0, 39, 39},
+
+	/* 40 */
+	{0, 40, 40},
+	{0, 41, 41},
+	{0, 42, 42},
+	{0, 43, 43},
+	{0, 44, 44},
+	{0, 45, 45},
+	{0, 46, 46},
+	{0, 47, 47},
+	{0, 48, 48},
+	{0, 49, 49},
+
+	/* 50 */
+	{0, 50, 50},
+	{0, 51, 51},
+	{0, 52, 52},
+	{0, 53, 53},
+	{0, 54, 54},
+	{0, 55, 55},
+	{0, 56, 56},
+	{0, 57, 57},
+	{0, 58, 58},
+	{0, 59, 59},
+
+	/* 60 */
+	{0, 60, 60},
+	{0, 61, 61},
+	{0, 62, 62},
+	{0, 63, 63},
+	{0, 64, 64},
+	{0, 65, 70},
+	{0, 66, 71},
+	{0, 67, 72},
+	{0, 68, 73},
+	{0, 70, 81},
+
+	/* 70 */
+	{0, 71, 82},
+	{0, 72, 83},
+	{0, 73, 84},
+	{0, 74, 85},
+	{0, 75, 86},
+	{0, 76, 87},
+	{0, 77, 88},
+	{0, 78, 89},
+	{0, 79, 90},
+	{0, 80, 91},
+
+	/* 80 */
+	{0, 81, 92},
+	{0, 82, 93},
+	{0, 83, 94},
+	{0, 84, 95},
+	{0, 85, 96},
+	{0, 86, 97},
+	{0, 87, 98},
+	{0, 88, 99},
+	{0, 89, 100},
+	{0, 90, 101},
+
+	/* 90 */
+	{0, 91, 102},
+	{0, 92, 103},
+	{0, 93, 104},
+	{0, 94, 105},
+	{0, 95, 106},
+	{0, 96, 107},
+	{0, 97, 108},
+	{0, 98, 109},
+	{0, 110, 110},
+	{0, 111, 111},
+
+	/* 100 */
+	{0, 112, 112},
+	{0, 113, 113},
+	{0, 114, 114},
+	{0, 115, 115},
+	{0, 116, 116},
+	{0, 117, 117},
+	{0, 118, 118},
+	{0, 119, 119},
+	{0, 120, 120},
+	{0, 121, 121},
+
+	/* 110 */
+	{0, 122, 122},
+	{0, 123, 123},
+	{0, 124, 124},
+	{0, 125, 125},
+	{0, 126, 126},
+	{0, 127, 127},
+	{0, 128, 128},
+	{0, 129, 129},
+	{0, 130, 130},
+	{0, 131, 131},
+
+	/* 120 */
+	{0, 132, 132},
+	{0, 133, 133},
+	{0, 134, 134},
+	{0, 135, 135},
+	{0, 136, 136},
+	{0, 137, 137},
+	{0, 138, 138},
+	{0, 139, 139},
+	{0, 140, 140},
+	{0, 141, 141},
+
+	/* 130 */
+	{0, 142, 142},
+	{0, 143, 143},
+	{0, 144, 144},
+	{0, 145, 145},
+	{0, 146, 146},
+	{0, 147, 147},
+	{0, 148, 148},
+	{0, 149, 149},
+	{0, 150, 150},
+	{0, 151, 151},
+
+	/* 140 */
+	{0, 152, 152},
+	{0, 153, 153},
+	{0, 154, 154},
+	{0, 155, 155},
+	{0, 156, 156},
+	{0, 157, 157},
+	{0, 158, 158},
+	{0, 159, 159},
+	{0, 160, 160},
+	{0, 161, 161},
+
+	/* 150 */
+	{0, 162, 162},
+	{0, 163, 163},
+	{0, 164, 164},
+	{0, 165, 165},
+	{0, 166, 166},
+	{0, 167, 167},
+	{0, 168, 168},
+	{0, 169, 169},
+	{0, 170, 170},
+	{0, 171, 171},
+
+	/* 160 */
+	{0, 172, 172},
+	{0, 173, 173},
+	{0, 174, 174},
+	{0, 175, 175},
+	{0, 176, 176},
+	{0, 177, 177},
+	{0, 178, 178},
+	{0, 179, 179},
+	{0, 180, 180},
+	{0, 181, 181},
+
+	/* 170 */
+	{0, 182, 182},
+	{0, 183, 183},
+	{0, 184, 184},
+	{0, 185, 185},
+	{0, 186, 186},
+	{0, 187, 187},
+	{0, 188, 188},
+	{0, 189, 189},
+	{0, 190, 190},
+	{0, 191, 191},
+
+	/* 180 */
+	{0, 192, 192},
+	{0, 193, 193},
+	{0, 194, 194},
+	{0, 195, 195},
+	{0, 196, 196},
+	{0, 197, 197},
+	{0, 198, 198},
+	{0, 199, 199},
+	{0, 200, 200},
+	{0, 201, 201},
+
+	/* 190 */
+	{0, 202, 202},
+	{0, 203, 203},
+	{0, 204, 204},
+	{0, 205, 205},
+	{0, 206, 206},
+	{0, 207, 207},
+	{0, 208, 208},
+	{0, 209, 209},
+	{0, 210, 210},
+	{0, 211, 211},
+
+	/* 200 */
+	{0, 212, 212},
+	{0, 213, 213},
+	{0, 214, 214},
+	{0, 215, 215},
+	{0, 216, 216},
+	{0, 217, 217},
+	{0, 218, 218},
+	{0, 219, 219},
+	{0, 220, 220},
+	{0, 221, 221},
+
+	/* 210 */
+	{0, 222, 222},
+	{0, 223, 223},
+	{0, 224, 224},
+	{0, 225, 225},
+	{0, 226, 226},
+	{0, 227, 227},
+	{0, 228, 228},
+	{0, 229, 229},
+	{0, 230, 230},
+	{0, 231, 231},
+
+	/* 220 */
+	{1, 0, 232},
+	{1, 1, 233},
+	{1, 2, 234},
+	{1, 3, 235},
+	{1, 4, 236},
+	{1, 5, 237},
+	{1, 6, 238},
+	{1, 7, 239},
+	{1, 8, 240},
+	{1, 9, 241},
+
+	/* 230 */
+	{1, 10, 242},
+	{1, 11, 243},
+	{1, 12, 244},
+	{1, 13, 245},
+	{1, 14, 246},
+	{1, 15, 247},
+	{1, 16, 248},
+	{1, 17, 249},
+	{1, 18, 250},
+	{1, 19, 251},
+
+	/* 240 */
+	{1, 20, 252},
+	{1, 21, 253},
+	{1, 22, 254},
+	{1, 23, 255},
+	{1, 24, 256},
+	{1, 25, 257},
+	{1, 26, 258},
+	{1, 27, 259},
+	{1, 28, 260},
+	{1, 29, 261},
+
+	/* 250 */
+	{1, 30, 262},
+	{1, 31, 263},
+	{1, 32, 264},
+	{1, 33, 265},
+	{1, 34, 266},
+	{1, 35, 267},
+	{1, 36, 268},
+	{1, 37, 269},
+	{1, 38, 270},
+	{1, 39, 271},
+
+	/* 260 */
+	{1, 40, 272},
+	{1, 41, 273},
+	{1, 42, 274},
+	{1, 43, 275},
+	{1, 44, 276},
+	{1, 45, 277},
+	{1, 46, 278},
+	{1, 47, 279},
+	{1, 48, 280},
+	{1, 49, 281},
+
+	/* 270 */
+	{1, 50, 282},
+	{1, 51, 283},
+	{1, 52, 284},
+	{1, 53, 285},
+	{1, 54, 286},
+	{1, 55, 287},
+	{1, 56, 288},
+	{1, 57, 289},
+	{1, 58, 290},
+	{1, 59, 291},
+
+	/* 280 */
+	{1, 60, 292},
+	{1, 61, 293},
+	{1, 62, 294},
+	{1, 63, 295},
+	{1, 64, 296},
+	{1, 65, 297},
+	{1, 66, 298},
+	{1, 67, 299},
+	{1, 68, 300},
+	{1, 69, 301},
+
+	/* 290 */
+	{1, 70, 302},
+	{1, 71, 303},
+	{1, 72, 304},
+	{1, 73, 305},
+	{1, 74, 306},
+	{1, 75, 307},
+	{1, 76, 308},
+	{1, 77, 309},
+	{1, 78, 310},
+	{1, 79, 311},
+
+	/* 300 */
+	{1, 80, 312},
+	{1, 81, 313},
+	{1, 82, 314},
+	{1, 83, 315},
+	{1, 84, 316},
+	{1, 85, 317},
+	{1, 86, 318},
+	{1, 87, 319},
+	{1, 88, 320},
+	{1, 89, 321},
+
+	/* 310 */
+	{1, 90, 322},
+	{1, 91, 323},
+	{1, 92, 324},
+	{1, 93, 325},
+	{1, 94, 326},
+	{1, 95, 327},
+	{1, 96, 328},
+	{1, 97, 329},
+	{1, 98, 330},
+	{1, 99, 331},
+
+	/* 320 */
+	{1, 100, 332},
+	{1, 101, 333},
+	{1, 102, 334},
+	{1, 103, 335},
+	{1, 104, 336},
+	{1, 105, 337},
+	{1, 106, 338},
+	{1, 107, 339},
+	{1, 108, 340},
+	{1, 109, 341},
+
+	/* 330 */
+	{1, 110, 342},
+	{1, 111, 343},
+	{1, 112, 344},
+	{1, 113, 345},
+	{1, 114, 346},
+	{1, 115, 347},
+	{1, 116, 348},
+	{1, 117, 349},
+	{1, 118, 350},
+	{1, 119, 351},
+
+	/* 340 */
+	{1, 120, 352},
+	{1, 121, 353},
+	{1, 122, 354},
+	{1, 123, 355},
+	{1, 124, 356},
+	{1, 125, 357},
+	{1, 126, 358},
+	{1, 127, 359},
+	{1, 128, 360},
+	{1, 129, 361},
+
+	/* 350 */
+	{1, 130, 362},
+	{1, 131, 363},
+	{1, 132, 364},
+	{1, 133, 365},
+	{1, 134, 366},
+	{1, 135, 367},
+	{1, 136, 368},
+	{1, 137, 369},
+	{1, 138, 370},
+	{1, 139, 371},
+
+	/* 360 */
+	{1, 140, 372},
+	{1, 141, 373},
+	{1, 142, 374},
+	{1, 143, 375},
+	{1, 144, 376},
+	{1, 145, 377},
+	{1, 146, 378},
+	{1, 147, 379},
+	{1, 148, 380},
+	{1, 149, 381},
+
+	/* 370 */
+	{1, 150, 382},
+	{1, 151, 383},
+	{1, 152, 384},
+	{1, 153, 385},
+	{1, 154, 386},
+	{1, 155, 387},
+	{1, 156, 388},
+	{1, 157, 389},
+	{1, 158, 390},
+	{1, 159, 391},
+
+	/* 380 */
+	{1, 160, 392},
+	{1, 161, 393},
+	{1, 162, 394},
+	{1, 163, 395},
+	{1, 164, 396},
+	{1, 165, 397},
+	{1, 166, 398},
+	{1, 167, 399},
+	{1, 168, 400},
+	{1, 169, 401},
+
+	/* 390 */
+	{1, 170, 402},
+	{1, 171, 403},
+	{1, 172, 404},
+	{1, 173, 405},
+	{1, 174, 406},
+	{1, 175, 407},
+	{1, 176, 408},
+	{1, 177, 409},
+	{1, 178, 410},
+	{1, 179, 411},
+
+	/* 400 */
+	{1, 180, 412},
+	{1, 181, 413},
+	{1, 182, 414},
+	{1, 183, 415},
+	{1, 184, 416},
+	{1, 185, 417},
+	{1, 186, 418},
+	{1, 187, 419},
+	{1, 188, 420},
+	{1, 189, 421},
+
+	/* 410 */
+	{1, 190, 422},
+	{1, 191, 423},
+	{1, 192, 424},
+	{1, 193, 425},
+	{1, 194, 426},
+	{1, 195, 427},
+	{1, 196, 428},
+	{1, 197, 429},
+	{1, 198, 430},
+	{1, 199, 431},
+
+	/* 420 */
+	{1, 200, 432},
+	{1, 201, 433},
+	{1, 202, 434},
+	{1, 203, 435},
+	{1, 204, 436},
+	{1, 205, 437},
+	{1, 206, 438},
+	{1, 207, 439},
+	{1, 208, 440},
+	{1, 209, 441},
+
+	/* 430 */
+	{1, 210, 442},
+	{1, 211, 443},
+	{1, 212, 444},
+	{1, 213, 445},
+	{1, 214, 446},
+	{1, 215, 447},
+	{1, 216, 448},
+	{1, 217, 449},
+	{1, 218, 450},
+	{1, 219, 451},
+
+	/* 440 */
+	{1, 220, 452},
+	{1, 221, 453},
+	{1, 222, 454},
+	{1, 223, 455},
+	{1, 224, 456},
+	{1, 225, 457},
+	{1, 226, 458},
+	{1, 227, 459},
+	{1, 228, 460},
+	{1, 229, 461},
+
+	/* 450 */
+	{1, 230, 462},
+	{1, 231, 463},
+	{1, 232, 464},
+	{1, 233, 465},
+	{1, 234, 466},
+	{1, 235, 467},
+	{1, 236, 468},
+	{1, 237, 469},
+	{1, 238, 470},
+	{1, 239, 471},
+
+	/* 460 */
+	{1, 240, 472},
+	{1, 241, 473},
+	{1, 242, 474},
+	{1, 243, 475},
+	{1, 244, 476},
+	{1, 245, 477},
+	{1, 246, 478},
+	{-1, -1, 479},
+	{-1, -1, 480},
+	{-1, -1, 481},
+
+	/* 470 */
+	{-1, -1, 482},
+	{-1, -1, 483},
+	{-1, -1, 484},
+	{-1, -1, 485},
+	{-1, -1, 486},
+	{-1, -1, 487},
+	{-1, -1, 488},
+	{-1, -1, 489},
+	{-1, -1, 490},
+	{-1, -1, 491},
+
+	/* 480 */
+	{-1, -1, 492},
+	{-1, -1, 493},
+	{-1, -1, 494},
+	{-1, -1, 495},
+	{-1, -1, 496},
+	{-1, -1, 497},
+	{-1, -1, 498},
+	{-1, -1, 499},
+	{-1, -1, 500},
+	{-1, -1, 501},
+
+	/* 490 */
+	{-1, -1, 502},
+	{-1, -1, 503},
+	{-1, -1, 504},
+	{-1, -1, 505},
+	{-1, -1, 506},
+	{-1, -1, 507},
+	{-1, -1, 508},
+	{-1, -1, 509},
+	{-1, -1, 510},
+
+};
+
+static struct mtk_device_num mtk6779_devices_num[] = {
+	{SLAVE_TYPE_INFRA, VIO_SLAVE_NUM_INFRA},
+};
+
+static int mtk_vio_mask_sta_num[] = {
+	VIO_MASK_STA_NUM_INFRA,
+};
+
+static const struct mtk_infra_vio_dbg_desc mt6779_vio_dbgs = {
+	.vio_dbg_mstid = INFRA_VIO_DBG_MSTID,
+	.vio_dbg_mstid_start_bit = INFRA_VIO_DBG_MSTID_START_BIT,
+	.vio_dbg_dmnid = INFRA_VIO_DBG_DMNID,
+	.vio_dbg_dmnid_start_bit = INFRA_VIO_DBG_DMNID_START_BIT,
+	.vio_dbg_w_vio = INFRA_VIO_DBG_W_VIO,
+	.vio_dbg_w_vio_start_bit = INFRA_VIO_DBG_W_VIO_START_BIT,
+	.vio_dbg_r_vio = INFRA_VIO_DBG_R_VIO,
+	.vio_dbg_r_vio_start_bit = INFRA_VIO_DBG_R_VIO_START_BIT,
+	.vio_addr_high = INFRA_VIO_ADDR_HIGH,
+	.vio_addr_high_start_bit = INFRA_VIO_ADDR_HIGH_START_BIT,
+};
+
+static const u32 mt6779_devapc_pds[] = {
+	PD_VIO_MASK_OFFSET,
+	PD_VIO_STA_OFFSET,
+	PD_VIO_DBG0_OFFSET,
+	PD_VIO_DBG1_OFFSET,
+	PD_APC_CON_OFFSET,
+	PD_SHIFT_STA_OFFSET,
+	PD_SHIFT_SEL_OFFSET,
+	PD_SHIFT_CON_OFFSET,
+};
+
+static u32 mt6779_shift_group_get(u32 vio_idx)
+{
+	if (vio_idx >= 0 && vio_idx <= 32)
+		return 0;
+	else if (vio_idx >= 33 && vio_idx <= 109)
+		return 1;
+	else if ((vio_idx >= 110 && vio_idx <= 121) ||
+		 (vio_idx >= 470 && vio_idx <= 472))
+		return 2;
+	else if (vio_idx == 122 || vio_idx == 500)
+		return 3;
+	else if (vio_idx == 123)
+		return 4;
+	else if (vio_idx == 124)
+		return 5;
+	else if ((vio_idx >= 125 && vio_idx <= 155) ||
+		 (vio_idx >= 486 && vio_idx <= 488))
+		return 6;
+	else if ((vio_idx >= 156 && vio_idx <= 157) ||
+		 (vio_idx >= 159 && vio_idx <= 165))
+		return 7;
+	else if ((vio_idx >= 166 && vio_idx <= 181) ||
+		 (vio_idx >= 473 && vio_idx <= 475))
+		return 8;
+	else if ((vio_idx >= 182 && vio_idx <= 197) ||
+		 (vio_idx >= 476 && vio_idx <= 478))
+		return 9;
+	else if ((vio_idx >= 198 && vio_idx <= 205) ||
+		 (vio_idx >= 479 && vio_idx <= 481))
+		return 10;
+	else if ((vio_idx >= 214 && vio_idx <= 229) ||
+		 (vio_idx >= 482 && vio_idx <= 484))
+		return 11;
+	else if (vio_idx == 230)
+		return 12;
+	else if (vio_idx == 158)
+		return 13;
+	else if (vio_idx == 231 || vio_idx == 382)
+		return 14;
+	else if (vio_idx >= 232 && vio_idx <= 244)
+		return 15;
+	else if (vio_idx >= 245 && vio_idx <= 478)
+		return 16;
+	else if (vio_idx >= 504 && vio_idx <= 505)
+		return 17;
+	else if (vio_idx == 494)
+		return 18;
+	else if (vio_idx == 503)
+		return 19;
+	else if (vio_idx == 501)
+		return 20;
+	else if (vio_idx == 502)
+		return 21;
+	else if (vio_idx == 506)
+		return 22;
+	else if (vio_idx == 507)
+		return 23;
+	else if (vio_idx == 508)
+		return 24;
+	else if ((vio_idx >= 206 && vio_idx <= 213) ||
+		 (vio_idx >= 498 && vio_idx <= 500))
+		return 25;
+
+	return 31;
+}
+
+/*
+ * mtk_devapc_pd_get - get devapc pd_types of register address.
+ *
+ * Returns the value of reg addr
+ */
+static void __iomem *mtk_devapc_pd_get(struct mtk_devapc_context *devapc_ctx,
+				       int slave_type,
+				       enum DEVAPC_PD_REG_TYPE pd_reg_type,
+				       u32 index)
+{
+	const u32 *devapc_pds = mt6779_devapc_pds;
+	void __iomem *reg;
+
+	reg = devapc_ctx->devapc_pd_base[slave_type] + devapc_pds[pd_reg_type];
+
+	if (pd_reg_type == VIO_MASK || pd_reg_type == VIO_STA)
+		reg += 0x4 * index;
+
+	return reg;
+}
+
+static int check_vio_mask_sta(struct mtk_devapc_context *devapc_ctx,
+			      int slave_type, u32 module, int pd_reg_type)
+{
+	u32 apc_register_index, apc_set_index;
+	void __iomem *reg;
+	u32 value;
+
+	apc_register_index = module / (MOD_NM_IN_1_DEVAPC * 2);
+	apc_set_index = module % (MOD_NM_IN_1_DEVAPC * 2);
+
+	if (apc_register_index < mtk_vio_mask_sta_num[slave_type])
+		reg = mtk_devapc_pd_get(devapc_ctx, slave_type, pd_reg_type,
+					apc_register_index);
+	else
+		return -EOVERFLOW;
+
+	value = (readl(reg) & (0x1 << apc_set_index)) >> apc_set_index;
+
+	return value;
+}
+
+static int check_vio_mask(struct mtk_devapc_context *devapc_ctx, int slave_type,
+			  u32 module)
+{
+	return check_vio_mask_sta(devapc_ctx, slave_type, module, VIO_MASK);
+}
+
+static int check_vio_status(struct mtk_devapc_context *devapc_ctx,
+			    int slave_type, u32 module)
+{
+	return check_vio_mask_sta(devapc_ctx, slave_type, module, VIO_STA);
+}
+
+static void clear_vio_status(struct mtk_devapc_context *devapc_ctx,
+			     int slave_type, u32 module)
+{
+	u32 apc_register_index, apc_set_index;
+	void __iomem *reg;
+
+	apc_register_index = module / (MOD_NM_IN_1_DEVAPC * 2);
+	apc_set_index = module % (MOD_NM_IN_1_DEVAPC * 2);
+
+	if (apc_register_index < mtk_vio_mask_sta_num[slave_type]) {
+		reg = mtk_devapc_pd_get(devapc_ctx, slave_type, VIO_STA,
+					apc_register_index);
+		writel(0x1 << apc_set_index, reg);
+
+	} else {
+		pr_err(PFX "%s: Out Of Boundary, slave_type:0x%x, module_index:0x%x\n",
+		       __func__, slave_type, module);
+		return;
+	}
+
+	if (check_vio_status(devapc_ctx, slave_type, module))
+		pr_err(PFX "%s: Clear failed, slave_type:0x%x, module_index:0x%x\n",
+		       __func__, slave_type, module);
+}
+
+static void mask_module_irq(struct mtk_devapc_context *devapc_ctx,
+			    int slave_type, u32 module, bool mask)
+{
+	u32 apc_register_index, apc_set_index;
+	void __iomem *reg;
+
+	apc_register_index = module / (MOD_NM_IN_1_DEVAPC * 2);
+	apc_set_index = module % (MOD_NM_IN_1_DEVAPC * 2);
+
+	if (apc_register_index < mtk_vio_mask_sta_num[slave_type]) {
+		reg = mtk_devapc_pd_get(devapc_ctx, slave_type, VIO_MASK,
+					apc_register_index);
+
+		if (mask)
+			writel(readl(reg) | (1 << apc_set_index), reg);
+		else
+			writel(readl(reg) & (~(1 << apc_set_index)), reg);
+
+	} else {
+		pr_err(PFX "%s: Out Of Boundary, slave_type:0x%x, module_index:0x%x, mask:%s\n",
+		       __func__, slave_type, module, mask ? "true" : "false");
+	}
+}
+
+/*
+ * sync_vio_dbg - start to get violation information by selecting violation
+ *		  group and enable violation shift.
+ *
+ * Returns sync done or not
+ */
+static u32 sync_vio_dbg(struct mtk_devapc_context *devapc_ctx, int slave_type,
+			u32 shift_bit)
+{
+	void __iomem *pd_vio_shift_sta_reg;
+	void __iomem *pd_vio_shift_sel_reg;
+	void __iomem *pd_vio_shift_con_reg;
+	u32 shift_count;
+	u32 sync_done;
+
+	pd_vio_shift_sta_reg = mtk_devapc_pd_get(devapc_ctx, slave_type,
+						 VIO_SHIFT_STA, 0);
+	pd_vio_shift_sel_reg = mtk_devapc_pd_get(devapc_ctx, slave_type,
+						 VIO_SHIFT_SEL, 0);
+	pd_vio_shift_con_reg = mtk_devapc_pd_get(devapc_ctx, slave_type,
+						 VIO_SHIFT_CON, 0);
+
+	writel(0x1 << shift_bit, pd_vio_shift_sel_reg);
+	writel(0x1, pd_vio_shift_con_reg);
+
+	for (shift_count = 0; (shift_count < 100) &&
+	     ((readl(pd_vio_shift_con_reg) & 0x3) != 0x3);
+	     ++shift_count)
+		;
+
+	if ((readl(pd_vio_shift_con_reg) & 0x3) == 0x3)
+		sync_done = 1;
+	else
+		sync_done = 0;
+
+	/* Disable shift mechanism */
+	writel(0x0, pd_vio_shift_con_reg);
+	writel(0x0, pd_vio_shift_sel_reg);
+	writel(0x1 << shift_bit, pd_vio_shift_sta_reg);
+
+	return sync_done;
+}
+
+static void devapc_vio_info_print(struct mtk_devapc_context *devapc_ctx)
+{
+	struct mtk_devapc_vio_info *vio_info = devapc_ctx->vio_info;
+
+	/* Print violation information */
+	if (vio_info->write)
+		pr_info(PFX "Write Violation\n");
+	else if (vio_info->read)
+		pr_info(PFX "Read Violation\n");
+
+	pr_info(PFX "%s%x, %s%x, %s%x, %s%x\n",
+		"Vio Addr:0x", vio_info->vio_addr,
+		"High:0x", vio_info->vio_addr_high,
+		"Bus ID:0x", vio_info->master_id,
+		"Dom ID:0x", vio_info->domain_id);
+}
+
+static void devapc_extract_vio_dbg(struct mtk_devapc_context *devapc_ctx,
+				   int slave_type)
+{
+	void __iomem *vio_dbg0_reg, *vio_dbg1_reg;
+	const struct mtk_infra_vio_dbg_desc *vio_dbgs;
+	struct mtk_devapc_vio_info *vio_info;
+	u32 dbg0;
+
+	vio_dbg0_reg = mtk_devapc_pd_get(devapc_ctx, slave_type, VIO_DBG0, 0);
+	vio_dbg1_reg = mtk_devapc_pd_get(devapc_ctx, slave_type, VIO_DBG1, 0);
+
+	vio_dbgs = &mt6779_vio_dbgs;
+	vio_info = devapc_ctx->vio_info;
+
+	/* Extract violation information */
+	dbg0 = readl(vio_dbg0_reg);
+	vio_info->vio_addr = readl(vio_dbg1_reg);
+
+	vio_info->master_id = (dbg0 & vio_dbgs->vio_dbg_mstid) >>
+			      vio_dbgs->vio_dbg_mstid_start_bit;
+	vio_info->domain_id = (dbg0 & vio_dbgs->vio_dbg_dmnid) >>
+			      vio_dbgs->vio_dbg_dmnid_start_bit;
+	vio_info->write = ((dbg0 & vio_dbgs->vio_dbg_w_vio) >>
+			   vio_dbgs->vio_dbg_w_vio_start_bit) == 1;
+	vio_info->read = ((dbg0 & vio_dbgs->vio_dbg_r_vio) >>
+			  vio_dbgs->vio_dbg_r_vio_start_bit) == 1;
+	vio_info->vio_addr_high = (dbg0 & vio_dbgs->vio_addr_high) >>
+				  vio_dbgs->vio_addr_high_start_bit;
+
+	devapc_vio_info_print(devapc_ctx);
+}
+
+/*
+ * mtk_devapc_dump_vio_dbg - shift & dump the violation debug information.
+ */
+static bool mtk_devapc_dump_vio_dbg(struct mtk_devapc_context *devapc_ctx,
+				    int slave_type, int *vio_idx, int *index)
+{
+	const struct mtk_device_info **device_info;
+	const struct mtk_device_num *ndevices;
+	void __iomem *pd_vio_shift_sta_reg;
+	u32 shift_bit;
+	int i;
+
+	if (!vio_idx)
+		return NULL;
+
+	device_info = devapc_ctx->device_info;
+	ndevices = mtk6779_devices_num;
+
+	pd_vio_shift_sta_reg = mtk_devapc_pd_get(devapc_ctx, slave_type,
+						 VIO_SHIFT_STA, 0);
+
+	for (i = 0; i < ndevices[slave_type].vio_slave_num; i++) {
+		*vio_idx = device_info[slave_type][i].vio_index;
+
+		if (check_vio_mask(devapc_ctx, slave_type, *vio_idx))
+			continue;
+
+		if (check_vio_status(devapc_ctx, slave_type, *vio_idx) <= 0)
+			continue;
+
+		shift_bit = mt6779_shift_group_get(*vio_idx);
+
+		if (!sync_vio_dbg(devapc_ctx, slave_type, shift_bit))
+			continue;
+
+		devapc_extract_vio_dbg(devapc_ctx, slave_type);
+		*index = i;
+
+		return true;
+	}
+
+	return false;
+}
+
+/*
+ * devapc_violation_irq - the devapc Interrupt Service Routine (ISR) will dump
+ *			  violation information including which master violates
+ *			  access slave.
+ */
+static irqreturn_t devapc_violation_irq(int irq_number,
+					struct mtk_devapc_context *devapc_ctx)
+{
+	const struct mtk_device_info **device_info = devapc_ctx->device_info;
+	int vio_idx = -1;
+	int index = -1;
+	int slave_type;
+
+	for (slave_type = 0; slave_type < SLAVE_TYPE_NUM; slave_type++) {
+		if (!mtk_devapc_dump_vio_dbg(devapc_ctx, slave_type, &vio_idx,
+					     &index))
+			continue;
+
+		/* Ensure that violation info are written before
+		 * further operations
+		 */
+		smp_mb();
+
+		mask_module_irq(devapc_ctx, slave_type, vio_idx, true);
+
+		clear_vio_status(devapc_ctx, slave_type, vio_idx);
+
+		pr_info(PFX "Violation - slave_type:0x%x, sys_index:0x%x, ctrl_index:0x%x, vio_index:0x%x\n",
+			slave_type,
+			device_info[slave_type][index].sys_index,
+			device_info[slave_type][index].ctrl_index,
+			device_info[slave_type][index].vio_index);
+
+		mask_module_irq(devapc_ctx, slave_type, vio_idx, false);
+	}
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * start_devapc - initialize devapc status and start receiving interrupt
+ *		  while devapc violation is triggered.
+ */
+static void start_devapc(struct mtk_devapc_context *devapc_ctx)
+{
+	const struct mtk_device_info **device_info;
+	const struct mtk_device_num *ndevices;
+	void __iomem *pd_vio_shift_sta_reg;
+	void __iomem *pd_apc_con_reg;
+	int slave_type, vio_idx, i;
+	u32 vio_shift_sta;
+
+	devapc_ctx->device_info[0] = mt6779_devices_infra;
+	device_info = devapc_ctx->device_info;
+	ndevices = mtk6779_devices_num;
+
+	for (slave_type = 0; slave_type < SLAVE_TYPE_NUM; slave_type++) {
+		pd_apc_con_reg = mtk_devapc_pd_get(devapc_ctx, slave_type,
+						   APC_CON, 0);
+		pd_vio_shift_sta_reg = mtk_devapc_pd_get(devapc_ctx, slave_type,
+							 VIO_SHIFT_STA, 0);
+
+		if (!pd_apc_con_reg || !pd_vio_shift_sta_reg)
+			return;
+
+		/* Clear devapc violation status */
+		writel(BIT(31), pd_apc_con_reg);
+
+		/* Clear violation shift status */
+		vio_shift_sta = readl(pd_vio_shift_sta_reg);
+		if (vio_shift_sta)
+			writel(vio_shift_sta, pd_vio_shift_sta_reg);
+
+		/* Clear slave violation status */
+		for (i = 0; i < ndevices[slave_type].vio_slave_num; i++) {
+			vio_idx = device_info[slave_type][i].vio_index;
+
+			clear_vio_status(devapc_ctx, slave_type, vio_idx);
+
+			mask_module_irq(devapc_ctx, slave_type, vio_idx, false);
+		}
+	}
+}
+
+static int mt6779_devapc_probe(struct platform_device *pdev)
+{
+	struct device_node *node = pdev->dev.of_node;
+	struct mtk_devapc_context *devapc_ctx;
+	struct clk *devapc_infra_clk;
+	u32 devapc_irq;
+	int ret;
+
+	if (IS_ERR(node))
+		return -ENODEV;
+
+	devapc_ctx = devm_kzalloc(&pdev->dev, sizeof(struct mtk_devapc_context),
+				  GFP_KERNEL);
+	if (!devapc_ctx)
+		return -ENOMEM;
+
+	devapc_ctx->vio_info = devm_kzalloc(&pdev->dev,
+					    sizeof(struct mtk_devapc_vio_info),
+					    GFP_KERNEL);
+	if (!devapc_ctx->vio_info)
+		return -ENOMEM;
+
+	devapc_ctx->devapc_pd_base[0] = of_iomap(node, 0);
+	if (!devapc_ctx->devapc_pd_base[0])
+		return -EINVAL;
+
+	devapc_irq = irq_of_parse_and_map(node, 0);
+	if (!devapc_irq)
+		return -EINVAL;
+
+	devapc_infra_clk = devm_clk_get(&pdev->dev, "devapc-infra-clock");
+
+	if (IS_ERR(devapc_infra_clk))
+		return -EINVAL;
+
+	if (clk_prepare_enable(devapc_infra_clk))
+		return -EINVAL;
+
+	start_devapc(devapc_ctx);
+
+	ret = devm_request_irq(&pdev->dev, devapc_irq,
+			       (irq_handler_t)devapc_violation_irq,
+			       IRQF_TRIGGER_NONE, "devapc", devapc_ctx);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int mt6779_devapc_remove(struct platform_device *dev)
+{
+	return 0;
+}
+
+static const struct of_device_id mt6779_devapc_dt_match[] = {
+	{ .compatible = "mediatek,mt6779-devapc" },
+	{},
+};
+
+static struct platform_driver mt6779_devapc_driver = {
+	.probe = mt6779_devapc_probe,
+	.remove = mt6779_devapc_remove,
+	.driver = {
+		.name = KBUILD_MODNAME,
+		.of_match_table = mt6779_devapc_dt_match,
+	},
+};
+
+module_platform_driver(mt6779_devapc_driver);
+
+MODULE_DESCRIPTION("Mediatek MT6779 Device APC Driver");
+MODULE_AUTHOR("Neal Liu <neal.liu@...iatek.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/soc/mediatek/devapc/devapc-mt6779.h b/drivers/soc/mediatek/devapc/devapc-mt6779.h
new file mode 100644
index 0000000..8c0e4e7
--- /dev/null
+++ b/drivers/soc/mediatek/devapc/devapc-mt6779.h
@@ -0,0 +1,99 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020 MediaTek Inc.
+ */
+
+#ifndef __DEVAPC_MT6779_H__
+#define __DEVAPC_MT6779_H__
+
+#define PFX			"[DEVAPC]: "
+#define MOD_NM_IN_1_DEVAPC	16
+
+enum DEVAPC_SLAVE_TYPE {
+	SLAVE_TYPE_INFRA = 0,
+	SLAVE_TYPE_NUM,
+};
+
+enum DEVAPC_PD_REG_TYPE {
+	VIO_MASK = 0,
+	VIO_STA,
+	VIO_DBG0,
+	VIO_DBG1,
+	APC_CON,
+	VIO_SHIFT_STA,
+	VIO_SHIFT_SEL,
+	VIO_SHIFT_CON,
+	PD_REG_TYPE_NUM,
+};
+
+enum DEVAPC_VIO_MASK_STA_NUM {
+	VIO_MASK_STA_NUM_INFRA = 17,
+};
+
+enum DEVAPC_VIO_SLAVE_NUM {
+	VIO_SLAVE_NUM_INFRA = 499,
+};
+
+enum DEVAPC_PD_OFFSET {
+	PD_VIO_MASK_OFFSET = 0x0,
+	PD_VIO_STA_OFFSET = 0x400,
+	PD_VIO_DBG0_OFFSET = 0x900,
+	PD_VIO_DBG1_OFFSET = 0x904,
+	PD_APC_CON_OFFSET = 0xF00,
+	PD_SHIFT_STA_OFFSET = 0xF10,
+	PD_SHIFT_SEL_OFFSET = 0xF14,
+	PD_SHIFT_CON_OFFSET = 0xF20,
+};
+
+struct mtk_device_num {
+	int slave_type;
+	u32 vio_slave_num;
+};
+
+struct mtk_devapc_vio_info {
+	bool read;
+	bool write;
+	u32 vio_addr;
+	u32 vio_addr_high;
+	u32 master_id;
+	u32 domain_id;
+};
+
+struct mtk_infra_vio_dbg_desc {
+	u32 vio_dbg_mstid;
+	u8 vio_dbg_mstid_start_bit;
+	u32 vio_dbg_dmnid;
+	u8 vio_dbg_dmnid_start_bit;
+	u32 vio_dbg_w_vio;
+	u8 vio_dbg_w_vio_start_bit;
+	u32 vio_dbg_r_vio;
+	u8 vio_dbg_r_vio_start_bit;
+	u32 vio_addr_high;
+	u8 vio_addr_high_start_bit;
+};
+
+struct mtk_device_info {
+	int sys_index;
+	int ctrl_index;
+	int vio_index;
+};
+
+struct mtk_devapc_context {
+	void __iomem *devapc_pd_base[SLAVE_TYPE_NUM];
+	const struct mtk_device_info *device_info[SLAVE_TYPE_NUM];
+	struct mtk_devapc_vio_info *vio_info;
+};
+
+/* For Infra VIO_DBG */
+#define INFRA_VIO_DBG_MSTID			0x0000FFFF
+#define INFRA_VIO_DBG_MSTID_START_BIT		0
+#define INFRA_VIO_DBG_DMNID			0x003F0000
+#define INFRA_VIO_DBG_DMNID_START_BIT		16
+#define INFRA_VIO_DBG_W_VIO			0x00400000
+#define INFRA_VIO_DBG_W_VIO_START_BIT		22
+#define INFRA_VIO_DBG_R_VIO			0x00800000
+#define INFRA_VIO_DBG_R_VIO_START_BIT		23
+#define INFRA_VIO_ADDR_HIGH			0x0F000000
+#define INFRA_VIO_ADDR_HIGH_START_BIT		24
+
+#endif /* __DEVAPC_MT6779_H__ */
-- 
1.7.9.5

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