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From:   Boris Brezillon <boris.brezillon@bootlin.com>
To:     Wolfram Sang <wsa@the-dreams.de>, linux-i2c@vger.kernel.org,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Arnd Bergmann <arnd@arndb.de>
Cc:     Jonathan Corbet <corbet@lwn.net>, linux-doc@vger.kernel.org,
        Przemyslaw Sroka <psroka@cadence.com>,
        Arkadiusz Golec <agolec@cadence.com>,
        Alan Douglas <adouglas@cadence.com>,
        Bartosz Folta <bfolta@cadence.com>,
        Damian Kos <dkos@cadence.com>,
        Alicja Jurasik-Urbaniak <alicja@cadence.com>,
        Cyprian Wronka <cwronka@cadence.com>,
        Suresh Punnoose <sureshp@cadence.com>,
        Rafal Ciepiela <rafalc@cadence.com>,
        Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
        Nishanth Menon <nm@ti.com>, Rob Herring <robh+dt@kernel.org>,
        Pawel Moll <pawel.moll@arm.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Ian Campbell <ijc+devicetree@hellion.org.uk>,
        Kumar Gala <galak@codeaurora.org>, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Vitor Soares <Vitor.Soares@synopsys.com>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        Linus Walleij <linus.walleij@linaro.org>,
        Xiang Lin <Xiang.Lin@synaptics.com>,
        linux-gpio@vger.kernel.org, Sekhar Nori <nsekhar@ti.com>,
        Przemyslaw Gaj <pgaj@cadence.com>,
        Peter Rosin <peda@axentia.se>,
        Mike Shettel <mshettel@codeaurora.org>,
        Stephen Boyd <swboyd@chromium.org>,
        Boris Brezillon <boris.brezillon@bootlin.com>
Subject: [PATCH v7 07/10] i3c: master: Add driver for Cadence IP
Date:   Wed,  5 Sep 2018 17:41:05 +0200
Message-Id: <20180905154108.20770-8-boris.brezillon@bootlin.com>
In-Reply-To: <20180905154108.20770-1-boris.brezillon@bootlin.com>
References: <20180905154108.20770-1-boris.brezillon@bootlin.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Add a driver for Cadence I3C master IP.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
---
Changes in v7:
- Fix readsl/writesl() usage
- Add a depends on ARM || ARM64 || XTENSA to forbid selection of this
  driver on platforms that are not implementing readsl/writesl

Changes in v6:
- Rework the attach/detach logic to match the new way of doing things.
- Use kcalloc() where appropriate
- Simplfy access to the RX/TX/IBI_DATA FIFOs

Changes in v5:
- Drop unused len var in cdns_i3c_master_handle_ibi()
- Get IBIR and CMDR depth from CONF_STATUS0
- s/2017/2018/ in copyright header
- Fix coding style issues

Changes in v4:
- Fix potential unsigned integer underflow
- Add missing static specific on IBI related functions

Changes in v3:
- Adjust to match I3C framework changes
- Implement support the CMD RESPONSE QUEUE and IBI QUEUE added in the
  latest revision of Cadence master IP
- Remove support for HDR modes

Changes in v2:
- Add basic IBI support. Note that the IP is not really reliable with
  regards to IBI because you can't extract IBI payloads as soon as you
  have more than one IBI waiting in the HW queue. This is something
  that will hopefully be addressed in future revisions of this IP
- Add a simple xfer queueing mechanism to optimize message queuing.
- Fix a few bugs
- Add support for Hot Join
---
 drivers/i3c/master/Kconfig           |    6 +
 drivers/i3c/master/Makefile          |    1 +
 drivers/i3c/master/i3c-master-cdns.c | 1668 ++++++++++++++++++++++++++++++++++
 3 files changed, 1675 insertions(+)
 create mode 100644 drivers/i3c/master/i3c-master-cdns.c

diff --git a/drivers/i3c/master/Kconfig b/drivers/i3c/master/Kconfig
index e69de29bb2d1..efab2a358359 100644
--- a/drivers/i3c/master/Kconfig
+++ b/drivers/i3c/master/Kconfig
@@ -0,0 +1,6 @@
+config CDNS_I3C_MASTER
+	tristate "Cadence I3C master driver"
+	depends on I3C
+	depends on ARM || ARM64 || XTENSA
+	help
+	  Enable this driver if you want to support Cadence I3C master block.
diff --git a/drivers/i3c/master/Makefile b/drivers/i3c/master/Makefile
index e69de29bb2d1..4c4304aa9534 100644
--- a/drivers/i3c/master/Makefile
+++ b/drivers/i3c/master/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_CDNS_I3C_MASTER)		+= i3c-master-cdns.o
diff --git a/drivers/i3c/master/i3c-master-cdns.c b/drivers/i3c/master/i3c-master-cdns.c
new file mode 100644
index 000000000000..dc096b058112
--- /dev/null
+++ b/drivers/i3c/master/i3c-master-cdns.c
@@ -0,0 +1,1668 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 Cadence Design Systems Inc.
+ *
+ * Author: Boris Brezillon <boris.brezillon@bootlin.com>
+ */
+
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/i3c/master.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/workqueue.h>
+
+#define DEV_ID				0x0
+#define DEV_ID_I3C_MASTER		0x5034
+
+#define CONF_STATUS0			0x4
+#define CONF_STATUS0_CMDR_DEPTH(x)	(4 << (((x) & GENMASK(31, 29)) >> 29))
+#define CONF_STATUS0_ECC_CHK		BIT(28)
+#define CONF_STATUS0_INTEG_CHK		BIT(27)
+#define CONF_STATUS0_CSR_DAP_CHK	BIT(26)
+#define CONF_STATUS0_TRANS_TOUT_CHK	BIT(25)
+#define CONF_STATUS0_PROT_FAULTS_CHK	BIT(24)
+#define CONF_STATUS0_GPO_NUM(x)		(((x) & GENMASK(23, 16)) >> 16)
+#define CONF_STATUS0_GPI_NUM(x)		(((x) & GENMASK(15, 8)) >> 8)
+#define CONF_STATUS0_IBIR_DEPTH(x)	(4 << (((x) & GENMASK(7, 6)) >> 7))
+#define CONF_STATUS0_SUPPORTS_DDR	BIT(5)
+#define CONF_STATUS0_SEC_MASTER		BIT(4)
+#define CONF_STATUS0_DEVS_NUM(x)	((x) & GENMASK(3, 0))
+
+#define CONF_STATUS1			0x8
+#define CONF_STATUS1_IBI_HW_RES(x)	((((x) & GENMASK(31, 28)) >> 28) + 1)
+#define CONF_STATUS1_CMD_DEPTH(x)	(4 << (((x) & GENMASK(27, 26)) >> 26))
+#define CONF_STATUS1_SLVDDR_RX_DEPTH(x)	(8 << (((x) & GENMASK(25, 21)) >> 21))
+#define CONF_STATUS1_SLVDDR_TX_DEPTH(x)	(8 << (((x) & GENMASK(20, 16)) >> 16))
+#define CONF_STATUS1_IBI_DEPTH(x)	(2 << (((x) & GENMASK(12, 10)) >> 10))
+#define CONF_STATUS1_RX_DEPTH(x)	(8 << (((x) & GENMASK(9, 5)) >> 5))
+#define CONF_STATUS1_TX_DEPTH(x)	(8 << ((x) & GENMASK(4, 0)))
+
+#define REV_ID				0xc
+#define REV_ID_VID(id)			(((id) & GENMASK(31, 20)) >> 20)
+#define REV_ID_PID(id)			(((id) & GENMASK(19, 8)) >> 8)
+#define REV_ID_REV_MAJOR(id)		(((id) & GENMASK(7, 4)) >> 4)
+#define REV_ID_REV_MINOR(id)		((id) & GENMASK(3, 0))
+
+#define CTRL				0x10
+#define CTRL_DEV_EN			BIT(31)
+#define CTRL_HALT_EN			BIT(30)
+#define CTRL_MCS			BIT(29)
+#define CTRL_MCS_EN			BIT(28)
+#define CTRL_HJ_DISEC			BIT(8)
+#define CTRL_MST_ACK			BIT(7)
+#define CTRL_HJ_ACK			BIT(6)
+#define CTRL_HJ_INIT			BIT(5)
+#define CTRL_MST_INIT			BIT(4)
+#define CTRL_AHDR_OPT			BIT(3)
+#define CTRL_PURE_BUS_MODE		0
+#define CTRL_MIXED_FAST_BUS_MODE	2
+#define CTRL_MIXED_SLOW_BUS_MODE	3
+#define CTRL_BUS_MODE_MASK		GENMASK(1, 0)
+
+#define PRESCL_CTRL0			0x14
+#define PRESCL_CTRL0_I2C(x)		((x) << 16)
+#define PRESCL_CTRL0_I3C(x)		(x)
+#define PRESCL_CTRL0_MAX		GENMASK(9, 0)
+
+#define PRESCL_CTRL1			0x18
+#define PRESCL_CTRL1_PP_LOW_MASK	GENMASK(15, 8)
+#define PRESCL_CTRL1_PP_LOW(x)		((x) << 8)
+#define PRESCL_CTRL1_OD_LOW_MASK	GENMASK(7, 0)
+#define PRESCL_CTRL1_OD_LOW(x)		(x)
+
+#define MST_IER				0x20
+#define MST_IDR				0x24
+#define MST_IMR				0x28
+#define MST_ICR				0x2c
+#define MST_ISR				0x30
+#define MST_INT_HALTED			BIT(18)
+#define MST_INT_MR_DONE			BIT(17)
+#define MST_INT_IMM_COMP		BIT(16)
+#define MST_INT_TX_THR			BIT(15)
+#define MST_INT_TX_OVF			BIT(14)
+#define MST_INT_IBID_THR		BIT(12)
+#define MST_INT_IBID_UNF		BIT(11)
+#define MST_INT_IBIR_THR		BIT(10)
+#define MST_INT_IBIR_UNF		BIT(9)
+#define MST_INT_IBIR_OVF		BIT(8)
+#define MST_INT_RX_THR			BIT(7)
+#define MST_INT_RX_UNF			BIT(6)
+#define MST_INT_CMDD_EMP		BIT(5)
+#define MST_INT_CMDD_THR		BIT(4)
+#define MST_INT_CMDD_OVF		BIT(3)
+#define MST_INT_CMDR_THR		BIT(2)
+#define MST_INT_CMDR_UNF		BIT(1)
+#define MST_INT_CMDR_OVF		BIT(0)
+
+#define MST_STATUS0			0x34
+#define MST_STATUS0_IDLE		BIT(18)
+#define MST_STATUS0_HALTED		BIT(17)
+#define MST_STATUS0_MASTER_MODE		BIT(16)
+#define MST_STATUS0_TX_FULL		BIT(13)
+#define MST_STATUS0_IBID_FULL		BIT(12)
+#define MST_STATUS0_IBIR_FULL		BIT(11)
+#define MST_STATUS0_RX_FULL		BIT(10)
+#define MST_STATUS0_CMDD_FULL		BIT(9)
+#define MST_STATUS0_CMDR_FULL		BIT(8)
+#define MST_STATUS0_TX_EMP		BIT(5)
+#define MST_STATUS0_IBID_EMP		BIT(4)
+#define MST_STATUS0_IBIR_EMP		BIT(3)
+#define MST_STATUS0_RX_EMP		BIT(2)
+#define MST_STATUS0_CMDD_EMP		BIT(1)
+#define MST_STATUS0_CMDR_EMP		BIT(0)
+
+#define CMDR				0x38
+#define CMDR_NO_ERROR			0
+#define CMDR_DDR_PREAMBLE_ERROR		1
+#define CMDR_DDR_PARITY_ERROR		2
+#define CMDR_DDR_RX_FIFO_OVF		3
+#define CMDR_DDR_TX_FIFO_UNF		4
+#define CMDR_M0_ERROR			5
+#define CMDR_M1_ERROR			6
+#define CMDR_M2_ERROR			7
+#define CMDR_MST_ABORT			8
+#define CMDR_NACK_RESP			9
+#define CMDR_INVALID_DA			10
+#define CMDR_DDR_DROPPED		11
+#define CMDR_ERROR(x)			(((x) & GENMASK(27, 24)) >> 24)
+#define CMDR_XFER_BYTES(x)		(((x) & GENMASK(19, 8)) >> 8)
+#define CMDR_CMDID_HJACK_DISEC		0xfe
+#define CMDR_CMDID_HJACK_ENTDAA		0xff
+#define CMDR_CMDID(x)			((x) & GENMASK(7, 0))
+
+#define IBIR				0x3c
+#define IBIR_ACKED			BIT(12)
+#define IBIR_SLVID(x)			(((x) & GENMASK(11, 8)) >> 8)
+#define IBIR_ERROR			BIT(7)
+#define IBIR_XFER_BYTES(x)		(((x) & GENMASK(6, 2)) >> 2)
+#define IBIR_TYPE_IBI			0
+#define IBIR_TYPE_HJ			1
+#define IBIR_TYPE_MR			2
+#define IBIR_TYPE(x)			((x) & GENMASK(1, 0))
+
+#define SLV_IER				0x40
+#define SLV_IDR				0x44
+#define SLV_IMR				0x48
+#define SLV_ICR				0x4c
+#define SLV_ISR				0x50
+#define SLV_INT_TM			BIT(20)
+#define SLV_INT_ERROR			BIT(19)
+#define SLV_INT_EVENT_UP		BIT(18)
+#define SLV_INT_HJ_DONE			BIT(17)
+#define SLV_INT_MR_DONE			BIT(16)
+#define SLV_INT_DA_UPD			BIT(15)
+#define SLV_INT_SDR_FAIL		BIT(14)
+#define SLV_INT_DDR_FAIL		BIT(13)
+#define SLV_INT_M_RD_ABORT		BIT(12)
+#define SLV_INT_DDR_RX_THR		BIT(11)
+#define SLV_INT_DDR_TX_THR		BIT(10)
+#define SLV_INT_SDR_RX_THR		BIT(9)
+#define SLV_INT_SDR_TX_THR		BIT(8)
+#define SLV_INT_DDR_RX_UNF		BIT(7)
+#define SLV_INT_DDR_TX_OVF		BIT(6)
+#define SLV_INT_SDR_RX_UNF		BIT(5)
+#define SLV_INT_SDR_TX_OVF		BIT(4)
+#define SLV_INT_DDR_RD_COMP		BIT(3)
+#define SLV_INT_DDR_WR_COMP		BIT(2)
+#define SLV_INT_SDR_RD_COMP		BIT(1)
+#define SLV_INT_SDR_WR_COMP		BIT(0)
+
+#define SLV_STATUS0			0x54
+#define SLV_STATUS0_REG_ADDR(s)		(((s) & GENMASK(23, 16)) >> 16)
+#define SLV_STATUS0_XFRD_BYTES(s)	((s) & GENMASK(15, 0))
+
+#define SLV_STATUS1			0x58
+#define SLV_STATUS1_AS(s)		(((s) & GENMASK(21, 20)) >> 20)
+#define SLV_STATUS1_VEN_TM		BIT(19)
+#define SLV_STATUS1_HJ_DIS		BIT(18)
+#define SLV_STATUS1_MR_DIS		BIT(17)
+#define SLV_STATUS1_PROT_ERR		BIT(16)
+#define SLV_STATUS1_DA(x)		(((s) & GENMASK(15, 9)) >> 9)
+#define SLV_STATUS1_HAS_DA		BIT(8)
+#define SLV_STATUS1_DDR_RX_FULL		BIT(7)
+#define SLV_STATUS1_DDR_TX_FULL		BIT(6)
+#define SLV_STATUS1_DDR_RX_EMPTY	BIT(5)
+#define SLV_STATUS1_DDR_TX_EMPTY	BIT(4)
+#define SLV_STATUS1_SDR_RX_FULL		BIT(3)
+#define SLV_STATUS1_SDR_TX_FULL		BIT(2)
+#define SLV_STATUS1_SDR_RX_EMPTY	BIT(1)
+#define SLV_STATUS1_SDR_TX_EMPTY	BIT(0)
+
+#define CMD0_FIFO			0x60
+#define CMD0_FIFO_IS_DDR		BIT(31)
+#define CMD0_FIFO_IS_CCC		BIT(30)
+#define CMD0_FIFO_BCH			BIT(29)
+#define XMIT_BURST_STATIC_SUBADDR	0
+#define XMIT_SINGLE_INC_SUBADDR		1
+#define XMIT_SINGLE_STATIC_SUBADDR	2
+#define XMIT_BURST_WITHOUT_SUBADDR	3
+#define CMD0_FIFO_PRIV_XMIT_MODE(m)	((m) << 27)
+#define CMD0_FIFO_SBCA			BIT(26)
+#define CMD0_FIFO_RSBC			BIT(25)
+#define CMD0_FIFO_IS_10B		BIT(24)
+#define CMD0_FIFO_PL_LEN(l)		((l) << 12)
+#define CMD0_FIFO_PL_LEN_MAX		4095
+#define CMD0_FIFO_DEV_ADDR(a)		((a) << 1)
+#define CMD0_FIFO_RNW			BIT(0)
+
+#define CMD1_FIFO			0x64
+#define CMD1_FIFO_CMDID(id)		((id) << 24)
+#define CMD1_FIFO_CSRADDR(a)		(a)
+#define CMD1_FIFO_CCC(id)		(id)
+
+#define TX_FIFO				0x68
+
+#define IMD_CMD0			0x70
+#define IMD_CMD0_PL_LEN(l)		((l) << 12)
+#define IMD_CMD0_DEV_ADDR(a)		((a) << 1)
+#define IMD_CMD0_RNW			BIT(0)
+
+#define IMD_CMD1			0x74
+#define IMD_CMD1_CCC(id)		(id)
+
+#define IMD_DATA			0x78
+#define RX_FIFO				0x80
+#define IBI_DATA_FIFO			0x84
+#define SLV_DDR_TX_FIFO			0x88
+#define SLV_DDR_RX_FIFO			0x8c
+
+#define CMD_IBI_THR_CTRL		0x90
+#define IBIR_THR(t)			((t) << 24)
+#define CMDR_THR(t)			((t) << 16)
+#define IBI_THR(t)			((t) << 8)
+#define CMD_THR(t)			(t)
+
+#define TX_RX_THR_CTRL			0x94
+#define RX_THR(t)			((t) << 16)
+#define TX_THR(t)			(t)
+
+#define SLV_DDR_TX_RX_THR_CTRL		0x98
+#define SLV_DDR_RX_THR(t)		((t) << 16)
+#define SLV_DDR_TX_THR(t)		(t)
+
+#define FLUSH_CTRL			0x9c
+#define FLUSH_IBI_RESP			BIT(23)
+#define FLUSH_CMD_RESP			BIT(22)
+#define FLUSH_SLV_DDR_RX_FIFO		BIT(22)
+#define FLUSH_SLV_DDR_TX_FIFO		BIT(21)
+#define FLUSH_IMM_FIFO			BIT(20)
+#define FLUSH_IBI_FIFO			BIT(19)
+#define FLUSH_RX_FIFO			BIT(18)
+#define FLUSH_TX_FIFO			BIT(17)
+#define FLUSH_CMD_FIFO			BIT(16)
+
+#define TTO_PRESCL_CTRL0		0xb0
+#define TTO_PRESCL_CTRL0_DIVB(x)	((x) << 16)
+#define TTO_PRESCL_CTRL0_DIVA(x)	(x)
+
+#define TTO_PRESCL_CTRL1		0xb4
+#define TTO_PRESCL_CTRL1_DIVB(x)	((x) << 16)
+#define TTO_PRESCL_CTRL1_DIVA(x)	(x)
+
+#define DEVS_CTRL			0xb8
+#define DEVS_CTRL_DEV_CLR_SHIFT		16
+#define DEVS_CTRL_DEV_CLR_ALL		GENMASK(31, 16)
+#define DEVS_CTRL_DEV_CLR(dev)		BIT(16 + (dev))
+#define DEVS_CTRL_DEV_ACTIVE(dev)	BIT(dev)
+#define DEVS_CTRL_DEVS_ACTIVE_MASK	GENMASK(15, 0)
+#define MAX_DEVS			16
+
+#define DEV_ID_RR0(d)			(0xc0 + ((d) * 0x10))
+#define DEV_ID_RR0_LVR_EXT_ADDR		BIT(11)
+#define DEV_ID_RR0_HDR_CAP		BIT(10)
+#define DEV_ID_RR0_IS_I3C		BIT(9)
+#define DEV_ID_RR0_DEV_ADDR_MASK	(GENMASK(6, 0) | GENMASK(15, 13))
+#define DEV_ID_RR0_SET_DEV_ADDR(a)	(((a) & GENMASK(6, 0)) |	\
+					 (((a) & GENMASK(9, 7)) << 6))
+#define DEV_ID_RR0_GET_DEV_ADDR(x)	((((x) >> 1) & GENMASK(6, 0)) |	\
+					 (((x) >> 6) & GENMASK(9, 7)))
+
+#define DEV_ID_RR1(d)			(0xc4 + ((d) * 0x10))
+#define DEV_ID_RR1_PID_MSB(pid)		(pid)
+
+#define DEV_ID_RR2(d)			(0xc8 + ((d) * 0x10))
+#define DEV_ID_RR2_PID_LSB(pid)		((pid) << 16)
+#define DEV_ID_RR2_BCR(bcr)		((bcr) << 8)
+#define DEV_ID_RR2_DCR(dcr)		(dcr)
+#define DEV_ID_RR2_LVR(lvr)		(lvr)
+
+#define SIR_MAP(x)			(0x180 + ((x) * 4))
+#define SIR_MAP_DEV_REG(d)		SIR_MAP((d) / 2)
+#define SIR_MAP_DEV_SHIFT(d, fs)	((fs) + (((d) % 2) ? 16 : 0))
+#define SIR_MAP_DEV_CONF_MASK(d)	(GENMASK(15, 0) << (((d) % 2) ? 16 : 0))
+#define SIR_MAP_DEV_CONF(d, c)		((c) << (((d) % 2) ? 16 : 0))
+#define DEV_ROLE_SLAVE			0
+#define DEV_ROLE_MASTER			1
+#define SIR_MAP_DEV_ROLE(role)		((role) << 14)
+#define SIR_MAP_DEV_SLOW		BIT(13)
+#define SIR_MAP_DEV_PL(l)		((l) << 8)
+#define SIR_MAP_PL_MAX			GENMASK(4, 0)
+#define SIR_MAP_DEV_DA(a)		((a) << 1)
+#define SIR_MAP_DEV_ACK			BIT(0)
+
+#define GPIR_WORD(x)			(0x200 + ((x) * 4))
+#define GPI_REG(val, id)		\
+	(((val) >> (((id) % 4) * 8)) & GENMASK(7, 0))
+
+#define GPOR_WORD(x)			(0x220 + ((x) * 4))
+#define GPO_REG(val, id)		\
+	(((val) >> (((id) % 4) * 8)) & GENMASK(7, 0))
+
+#define ASF_INT_STATUS			0x300
+#define ASF_INT_RAW_STATUS		0x304
+#define ASF_INT_MASK			0x308
+#define ASF_INT_TEST			0x30c
+#define ASF_INT_FATAL_SELECT		0x310
+#define ASF_INTEGRITY_ERR		BIT(6)
+#define ASF_PROTOCOL_ERR		BIT(5)
+#define ASF_TRANS_TIMEOUT_ERR		BIT(4)
+#define ASF_CSR_ERR			BIT(3)
+#define ASF_DAP_ERR			BIT(2)
+#define ASF_SRAM_UNCORR_ERR		BIT(1)
+#define ASF_SRAM_CORR_ERR		BIT(0)
+
+#define ASF_SRAM_CORR_FAULT_STATUS	0x320
+#define ASF_SRAM_UNCORR_FAULT_STATUS	0x324
+#define ASF_SRAM_CORR_FAULT_INSTANCE(x)	((x) >> 24)
+#define ASF_SRAM_CORR_FAULT_ADDR(x)	((x) & GENMASK(23, 0))
+
+#define ASF_SRAM_FAULT_STATS		0x328
+#define ASF_SRAM_FAULT_UNCORR_STATS(x)	((x) >> 16)
+#define ASF_SRAM_FAULT_CORR_STATS(x)	((x) & GENMASK(15, 0))
+
+#define ASF_TRANS_TOUT_CTRL		0x330
+#define ASF_TRANS_TOUT_EN		BIT(31)
+#define ASF_TRANS_TOUT_VAL(x)	(x)
+
+#define ASF_TRANS_TOUT_FAULT_MASK	0x334
+#define ASF_TRANS_TOUT_FAULT_STATUS	0x338
+#define ASF_TRANS_TOUT_FAULT_APB	BIT(3)
+#define ASF_TRANS_TOUT_FAULT_SCL_LOW	BIT(2)
+#define ASF_TRANS_TOUT_FAULT_SCL_HIGH	BIT(1)
+#define ASF_TRANS_TOUT_FAULT_FSCL_HIGH	BIT(0)
+
+#define ASF_PROTO_FAULT_MASK		0x340
+#define ASF_PROTO_FAULT_STATUS		0x344
+#define ASF_PROTO_FAULT_SLVSDR_RD_ABORT	BIT(31)
+#define ASF_PROTO_FAULT_SLVDDR_FAIL	BIT(30)
+#define ASF_PROTO_FAULT_S(x)		BIT(16 + (x))
+#define ASF_PROTO_FAULT_MSTSDR_RD_ABORT	BIT(15)
+#define ASF_PROTO_FAULT_MSTDDR_FAIL	BIT(14)
+#define ASF_PROTO_FAULT_M(x)		BIT(x)
+
+struct cdns_i3c_master_caps {
+	u32 cmdfifodepth;
+	u32 cmdrfifodepth;
+	u32 txfifodepth;
+	u32 rxfifodepth;
+	u32 ibirfifodepth;
+};
+
+struct cdns_i3c_cmd {
+	u32 cmd0;
+	u32 cmd1;
+	u32 tx_len;
+	const void *tx_buf;
+	u32 rx_len;
+	void *rx_buf;
+	u32 error;
+};
+
+struct cdns_i3c_xfer {
+	struct list_head node;
+	struct completion comp;
+	int ret;
+	unsigned int ncmds;
+	struct cdns_i3c_cmd cmds[0];
+};
+
+struct cdns_i3c_master {
+	struct work_struct hj_work;
+	struct i3c_master_controller base;
+	u32 free_rr_slots;
+	unsigned int maxdevs;
+	struct {
+		unsigned int num_slots;
+		struct i3c_dev_desc **slots;
+		spinlock_t lock;
+	} ibi;
+	struct {
+		struct list_head list;
+		struct cdns_i3c_xfer *cur;
+		spinlock_t lock;
+	} xferqueue;
+	void __iomem *regs;
+	struct clk *sysclk;
+	struct clk *pclk;
+	struct cdns_i3c_master_caps caps;
+	unsigned long i3c_scl_lim;
+};
+
+static inline struct cdns_i3c_master *
+to_cdns_i3c_master(struct i3c_master_controller *master)
+{
+	return container_of(master, struct cdns_i3c_master, base);
+}
+
+static void cdns_i3c_master_wr_to_tx_fifo(struct cdns_i3c_master *master,
+					  const u8 *bytes, int nbytes)
+{
+	writesl(master->regs + TX_FIFO, bytes, nbytes / 4);
+	if (nbytes & 3) {
+		u32 tmp = 0;
+
+		memcpy(&tmp, bytes + (nbytes & ~3), nbytes & 3);
+		__raw_writel(tmp, master->regs + TX_FIFO);
+	}
+}
+
+static void cdns_i3c_master_rd_from_rx_fifo(struct cdns_i3c_master *master,
+					    u8 *bytes, int nbytes)
+{
+	readsl(master->regs + RX_FIFO, bytes, nbytes / 4);
+	if (nbytes & 3) {
+		u32 tmp = __raw_readl(master->regs + RX_FIFO);
+
+		memcpy(bytes + (nbytes & ~3), &tmp, nbytes & 3);
+	}
+}
+
+static bool cdns_i3c_master_supports_ccc_cmd(struct i3c_master_controller *m,
+					     const struct i3c_ccc_cmd *cmd)
+{
+	if (cmd->ndests > 1)
+		return false;
+
+	switch (cmd->id) {
+	case I3C_CCC_ENEC(true):
+	case I3C_CCC_ENEC(false):
+	case I3C_CCC_DISEC(true):
+	case I3C_CCC_DISEC(false):
+	case I3C_CCC_ENTAS(0, true):
+	case I3C_CCC_ENTAS(0, false):
+	case I3C_CCC_RSTDAA(true):
+	case I3C_CCC_RSTDAA(false):
+	case I3C_CCC_ENTDAA:
+	case I3C_CCC_SETMWL(true):
+	case I3C_CCC_SETMWL(false):
+	case I3C_CCC_SETMRL(true):
+	case I3C_CCC_SETMRL(false):
+	case I3C_CCC_DEFSLVS:
+	case I3C_CCC_ENTHDR(0):
+	case I3C_CCC_SETDASA:
+	case I3C_CCC_SETNEWDA:
+	case I3C_CCC_GETMWL:
+	case I3C_CCC_GETMRL:
+	case I3C_CCC_GETPID:
+	case I3C_CCC_GETBCR:
+	case I3C_CCC_GETDCR:
+	case I3C_CCC_GETSTATUS:
+	case I3C_CCC_GETACCMST:
+	case I3C_CCC_GETMXDS:
+	case I3C_CCC_GETHDRCAP:
+		return true;
+	default:
+		break;
+	}
+
+	return false;
+}
+
+static int cdns_i3c_master_disable(struct cdns_i3c_master *master)
+{
+	u32 status;
+
+	writel(readl(master->regs + CTRL) & ~CTRL_DEV_EN, master->regs + CTRL);
+
+	return readl_poll_timeout(master->regs + MST_STATUS0, status,
+				  status & MST_STATUS0_IDLE, 10, 1000000);
+}
+
+static void cdns_i3c_master_enable(struct cdns_i3c_master *master)
+{
+	writel(readl(master->regs + CTRL) | CTRL_DEV_EN, master->regs + CTRL);
+}
+
+static struct cdns_i3c_xfer *
+cdns_i3c_master_alloc_xfer(struct cdns_i3c_master *master, unsigned int ncmds)
+{
+	struct cdns_i3c_xfer *xfer;
+
+	xfer = kzalloc(sizeof(*xfer) + (ncmds * sizeof(*xfer->cmds)),
+		       GFP_KERNEL);
+	if (!xfer)
+		return NULL;
+
+	INIT_LIST_HEAD(&xfer->node);
+	xfer->ncmds = ncmds;
+	xfer->ret = -ETIMEDOUT;
+
+	return xfer;
+}
+
+static void cdns_i3c_master_free_xfer(struct cdns_i3c_xfer *xfer)
+{
+	kfree(xfer);
+}
+
+static void cdns_i3c_master_start_xfer_locked(struct cdns_i3c_master *master)
+{
+	struct cdns_i3c_xfer *xfer = master->xferqueue.cur;
+	unsigned int i;
+
+	if (!xfer)
+		return;
+
+	writel(MST_INT_CMDD_EMP, master->regs + MST_ICR);
+	for (i = 0; i < xfer->ncmds; i++) {
+		struct cdns_i3c_cmd *cmd = &xfer->cmds[i];
+
+		cdns_i3c_master_wr_to_tx_fifo(master, cmd->tx_buf,
+					      cmd->tx_len);
+	}
+
+	for (i = 0; i < xfer->ncmds; i++) {
+		struct cdns_i3c_cmd *cmd = &xfer->cmds[i];
+
+		writel(cmd->cmd1 | CMD1_FIFO_CMDID(i),
+		       master->regs + CMD1_FIFO);
+		writel(cmd->cmd0, master->regs + CMD0_FIFO);
+	}
+
+	writel(readl(master->regs + CTRL) | CTRL_MCS,
+	       master->regs + CTRL);
+	writel(MST_INT_CMDD_EMP, master->regs + MST_IER);
+}
+
+static void cdns_i3c_master_end_xfer_locked(struct cdns_i3c_master *master,
+					    u32 isr)
+{
+	struct cdns_i3c_xfer *xfer = master->xferqueue.cur;
+	int i, ret = 0;
+	u32 status0;
+
+	if (!xfer)
+		return;
+
+	if (!(isr & MST_INT_CMDD_EMP))
+		return;
+
+	writel(MST_INT_CMDD_EMP, master->regs + MST_IDR);
+
+	for (status0 = readl(master->regs + MST_STATUS0);
+	     !(status0 & MST_STATUS0_CMDR_EMP);
+	     status0 = readl(master->regs + MST_STATUS0)) {
+		struct cdns_i3c_cmd *cmd;
+		u32 cmdr, rx_len, id;
+
+		cmdr = readl(master->regs + CMDR);
+		id = CMDR_CMDID(cmdr);
+		if (id == CMDR_CMDID_HJACK_DISEC ||
+		    id == CMDR_CMDID_HJACK_ENTDAA ||
+		    WARN_ON(id >= xfer->ncmds))
+			continue;
+
+		cmd = &xfer->cmds[CMDR_CMDID(cmdr)];
+		rx_len = min_t(u32, CMDR_XFER_BYTES(cmdr), cmd->rx_len);
+		cdns_i3c_master_rd_from_rx_fifo(master, cmd->rx_buf, rx_len);
+		cmd->error = CMDR_ERROR(cmdr);
+	}
+
+	for (i = 0; i < xfer->ncmds; i++) {
+		switch (xfer->cmds[i].error) {
+		case CMDR_NO_ERROR:
+			break;
+
+		case CMDR_DDR_PREAMBLE_ERROR:
+		case CMDR_DDR_PARITY_ERROR:
+		case CMDR_M0_ERROR:
+		case CMDR_M1_ERROR:
+		case CMDR_M2_ERROR:
+		case CMDR_MST_ABORT:
+		case CMDR_NACK_RESP:
+		case CMDR_DDR_DROPPED:
+			ret = -EIO;
+			break;
+
+		case CMDR_DDR_RX_FIFO_OVF:
+		case CMDR_DDR_TX_FIFO_UNF:
+			ret = -ENOSPC;
+			break;
+
+		case CMDR_INVALID_DA:
+		default:
+			ret = -EINVAL;
+			break;
+		}
+	}
+
+	xfer->ret = ret;
+	complete(&xfer->comp);
+
+	xfer = list_first_entry_or_null(&master->xferqueue.list,
+					struct cdns_i3c_xfer, node);
+	if (xfer)
+		list_del_init(&xfer->node);
+
+	master->xferqueue.cur = xfer;
+	cdns_i3c_master_start_xfer_locked(master);
+}
+
+static void cdns_i3c_master_queue_xfer(struct cdns_i3c_master *master,
+				       struct cdns_i3c_xfer *xfer)
+{
+	unsigned long flags;
+
+	init_completion(&xfer->comp);
+	spin_lock_irqsave(&master->xferqueue.lock, flags);
+	if (master->xferqueue.cur) {
+		list_add_tail(&xfer->node, &master->xferqueue.list);
+	} else {
+		master->xferqueue.cur = xfer;
+		cdns_i3c_master_start_xfer_locked(master);
+	}
+	spin_unlock_irqrestore(&master->xferqueue.lock, flags);
+}
+
+static void cdns_i3c_master_unqueue_xfer(struct cdns_i3c_master *master,
+					 struct cdns_i3c_xfer *xfer)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&master->xferqueue.lock, flags);
+	if (master->xferqueue.cur == xfer) {
+		u32 status;
+
+		writel(readl(master->regs + CTRL) & ~CTRL_DEV_EN,
+		       master->regs + CTRL);
+		readl_poll_timeout_atomic(master->regs + MST_STATUS0, status,
+					  status & MST_STATUS0_IDLE, 10,
+					  1000000);
+		master->xferqueue.cur = NULL;
+		writel(FLUSH_RX_FIFO | FLUSH_TX_FIFO | FLUSH_CMD_FIFO |
+		       FLUSH_CMD_RESP,
+		       master->regs + FLUSH_CTRL);
+		writel(MST_INT_CMDD_EMP, master->regs + MST_IDR);
+		writel(readl(master->regs + CTRL) | CTRL_DEV_EN,
+		       master->regs + CTRL);
+	} else {
+		list_del_init(&xfer->node);
+	}
+	spin_unlock_irqrestore(&master->xferqueue.lock, flags);
+}
+
+static enum i3c_error_code cdns_i3c_cmd_get_err(struct cdns_i3c_cmd *cmd)
+{
+	switch (cmd->error) {
+	case CMDR_M0_ERROR:
+		return I3C_ERROR_M0;
+
+	case CMDR_M1_ERROR:
+		return I3C_ERROR_M1;
+
+	case CMDR_M2_ERROR:
+	case CMDR_NACK_RESP:
+		return I3C_ERROR_M2;
+
+	default:
+		break;
+	}
+
+	return I3C_ERROR_UNKNOWN;
+}
+
+static int cdns_i3c_master_send_ccc_cmd(struct i3c_master_controller *m,
+					struct i3c_ccc_cmd *cmd)
+{
+	struct cdns_i3c_master *master = to_cdns_i3c_master(m);
+	struct cdns_i3c_xfer *xfer;
+	struct cdns_i3c_cmd *ccmd;
+	int ret;
+
+	xfer = cdns_i3c_master_alloc_xfer(master, 1);
+	if (!xfer)
+		return -ENOMEM;
+
+	ccmd = xfer->cmds;
+	ccmd->cmd1 = CMD1_FIFO_CCC(cmd->id);
+	ccmd->cmd0 = CMD0_FIFO_IS_CCC |
+		     CMD0_FIFO_PL_LEN(cmd->dests[0].payload.len);
+
+	if (cmd->id & I3C_CCC_DIRECT)
+		ccmd->cmd0 |= CMD0_FIFO_DEV_ADDR(cmd->dests[0].addr);
+
+	if (cmd->rnw) {
+		ccmd->cmd0 |= CMD0_FIFO_RNW;
+		ccmd->rx_buf = cmd->dests[0].payload.data;
+		ccmd->rx_len = cmd->dests[0].payload.len;
+	} else {
+		ccmd->tx_buf = cmd->dests[0].payload.data;
+		ccmd->tx_len = cmd->dests[0].payload.len;
+	}
+
+	cdns_i3c_master_queue_xfer(master, xfer);
+	if (!wait_for_completion_timeout(&xfer->comp, msecs_to_jiffies(1000)))
+		cdns_i3c_master_unqueue_xfer(master, xfer);
+
+	ret = xfer->ret;
+	cmd->err = cdns_i3c_cmd_get_err(&xfer->cmds[0]);
+	cdns_i3c_master_free_xfer(xfer);
+
+	return ret;
+}
+
+static int cdns_i3c_master_priv_xfers(struct i3c_dev_desc *dev,
+				      struct i3c_priv_xfer *xfers,
+				      int nxfers)
+{
+	struct i3c_master_controller *m = i3c_dev_get_master(dev);
+	struct cdns_i3c_master *master = to_cdns_i3c_master(m);
+	int txslots = 0, rxslots = 0, i, ret;
+	struct cdns_i3c_xfer *cdns_xfer;
+
+	for (i = 0; i < nxfers; i++) {
+		if (xfers[i].len > CMD0_FIFO_PL_LEN_MAX)
+			return -ENOTSUPP;
+	}
+
+	if (!nxfers)
+		return 0;
+
+	if (nxfers > master->caps.cmdfifodepth ||
+	    nxfers > master->caps.cmdrfifodepth)
+		return -ENOTSUPP;
+
+	/*
+	 * First make sure that all transactions (block of transfers separated
+	 * by a STOP marker) fit in the FIFOs.
+	 */
+	for (i = 0; i < nxfers; i++) {
+		if (xfers[i].rnw)
+			rxslots += DIV_ROUND_UP(xfers[i].len, 4);
+		else
+			txslots += DIV_ROUND_UP(xfers[i].len, 4);
+	}
+
+	if (rxslots > master->caps.rxfifodepth ||
+	    txslots > master->caps.txfifodepth)
+		return -ENOTSUPP;
+
+	cdns_xfer = cdns_i3c_master_alloc_xfer(master, nxfers);
+	if (!cdns_xfer)
+		return -ENOMEM;
+
+	for (i = 0; i < nxfers; i++) {
+		struct cdns_i3c_cmd *ccmd = &cdns_xfer->cmds[i];
+		u32 pl_len = xfers[i].len;
+
+		ccmd->cmd0 = CMD0_FIFO_DEV_ADDR(dev->info.dyn_addr) |
+			CMD0_FIFO_PRIV_XMIT_MODE(XMIT_BURST_WITHOUT_SUBADDR);
+
+		if (xfers[i].rnw) {
+			ccmd->cmd0 |= CMD0_FIFO_RNW;
+			ccmd->rx_buf = xfers[i].data.in;
+			ccmd->rx_len = xfers[i].len;
+			pl_len++;
+		} else {
+			ccmd->tx_buf = xfers[i].data.out;
+			ccmd->tx_len = xfers[i].len;
+		}
+
+		ccmd->cmd0 |= CMD0_FIFO_PL_LEN(pl_len);
+
+		if (i < nxfers - 1)
+			ccmd->cmd0 |= CMD0_FIFO_RSBC;
+
+		if (!i)
+			ccmd->cmd0 |= CMD0_FIFO_BCH;
+	}
+
+	cdns_i3c_master_queue_xfer(master, cdns_xfer);
+	if (!wait_for_completion_timeout(&cdns_xfer->comp,
+					 msecs_to_jiffies(1000)))
+		cdns_i3c_master_unqueue_xfer(master, cdns_xfer);
+
+	ret = cdns_xfer->ret;
+
+	for (i = 0; i < nxfers; i++)
+		xfers[i].err = cdns_i3c_cmd_get_err(&cdns_xfer->cmds[i]);
+
+	cdns_i3c_master_free_xfer(cdns_xfer);
+
+	return ret;
+}
+
+static int cdns_i3c_master_i2c_xfers(struct i2c_dev_desc *dev,
+				     const struct i2c_msg *xfers, int nxfers)
+{
+	struct i3c_master_controller *m = i2c_dev_get_master(dev);
+	struct cdns_i3c_master *master = to_cdns_i3c_master(m);
+	unsigned int nrxwords = 0, ntxwords = 0;
+	struct cdns_i3c_xfer *xfer;
+	int i, ret = 0;
+
+	if (nxfers > master->caps.cmdfifodepth)
+		return -ENOTSUPP;
+
+	for (i = 0; i < nxfers; i++) {
+		if (xfers[i].len > CMD0_FIFO_PL_LEN_MAX)
+			return -ENOTSUPP;
+
+		if (xfers[i].flags & I2C_M_RD)
+			nrxwords += DIV_ROUND_UP(xfers[i].len, 4);
+		else
+			ntxwords += DIV_ROUND_UP(xfers[i].len, 4);
+	}
+
+	if (ntxwords > master->caps.txfifodepth ||
+	    nrxwords > master->caps.rxfifodepth)
+		return -ENOTSUPP;
+
+	xfer = cdns_i3c_master_alloc_xfer(master, nxfers);
+	if (!xfer)
+		return -ENOMEM;
+
+	for (i = 0; i < nxfers; i++) {
+		struct cdns_i3c_cmd *ccmd = &xfer->cmds[0];
+
+		ccmd->cmd0 = CMD0_FIFO_DEV_ADDR(xfers[i].addr) |
+			CMD0_FIFO_PL_LEN(xfers[i].len) |
+			CMD0_FIFO_PRIV_XMIT_MODE(XMIT_BURST_WITHOUT_SUBADDR);
+
+		if (xfers[i].flags & I2C_M_TEN)
+			ccmd->cmd0 |= CMD0_FIFO_IS_10B;
+
+		if (xfers[i].flags & I2C_M_RD) {
+			ccmd->cmd0 |= CMD0_FIFO_RNW;
+			ccmd->rx_buf = xfers[i].buf;
+			ccmd->rx_len = xfers[i].len;
+		} else {
+			ccmd->tx_buf = xfers[i].buf;
+			ccmd->tx_len = xfers[i].len;
+		}
+	}
+
+	cdns_i3c_master_queue_xfer(master, xfer);
+	if (!wait_for_completion_timeout(&xfer->comp, msecs_to_jiffies(1000)))
+		cdns_i3c_master_unqueue_xfer(master, xfer);
+
+	ret = xfer->ret;
+	cdns_i3c_master_free_xfer(xfer);
+
+	return ret;
+}
+
+static u32 cdns_i3c_master_i2c_funcs(struct i3c_master_controller *m)
+{
+	return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR;
+}
+
+struct cdns_i3c_i2c_dev_data {
+	u16 id;
+	s16 ibi;
+	struct i3c_generic_ibi_pool *ibi_pool;
+};
+
+static u32 prepare_rr0_dev_address(u32 addr)
+{
+	u32 ret = (addr << 1) & 0xff;
+
+	/* RR0[7:1] = addr[6:0] */
+	ret |= (addr & GENMASK(6, 0)) << 1;
+
+	/* RR0[15:13] = addr[9:7] */
+	ret |= (addr & GENMASK(9, 7)) << 6;
+
+	/* RR0[0] = ~XOR(addr[6:0]) */
+	if (!(hweight8(addr & 0x7f) & 1))
+		ret |= 1;
+
+	return ret;
+}
+
+static void cdns_i3c_master_upd_i3c_addr(struct i3c_dev_desc *dev)
+{
+	struct i3c_master_controller *m = i3c_dev_get_master(dev);
+	struct cdns_i3c_master *master = to_cdns_i3c_master(m);
+	struct cdns_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev);
+	u32 rr;
+
+	rr = prepare_rr0_dev_address(dev->info.dyn_addr ?
+				     dev->info.dyn_addr :
+				     dev->info.static_addr);
+	writel(DEV_ID_RR0_IS_I3C | rr, master->regs + DEV_ID_RR0(data->id));
+}
+
+static int cdns_i3c_master_get_rr_slot(struct cdns_i3c_master *master,
+				       u8 dyn_addr)
+{
+	u32 activedevs, rr;
+	int i;
+
+	if (!dyn_addr) {
+		if (!master->free_rr_slots)
+			return -ENOSPC;
+
+		return ffs(master->free_rr_slots) - 1;
+	}
+
+	activedevs = readl(master->regs + DEVS_CTRL) &
+		     DEVS_CTRL_DEVS_ACTIVE_MASK;
+
+	for (i = 1; i <= master->maxdevs; i++) {
+		if (!(BIT(i) & activedevs))
+			continue;
+
+		rr = readl(master->regs + DEV_ID_RR0(i));
+		if (!(rr & DEV_ID_RR0_IS_I3C) ||
+		    DEV_ID_RR0_GET_DEV_ADDR(rr) != dyn_addr)
+			continue;
+
+		return i;
+	}
+
+	return -EINVAL;
+}
+
+static int cdns_i3c_master_reattach_i3c_dev(struct i3c_dev_desc *dev,
+					    u8 old_dyn_addr)
+{
+	cdns_i3c_master_upd_i3c_addr(dev);
+
+	return 0;
+}
+
+static int cdns_i3c_master_attach_i3c_dev(struct i3c_dev_desc *dev)
+{
+	struct i3c_master_controller *m = i3c_dev_get_master(dev);
+	struct cdns_i3c_master *master = to_cdns_i3c_master(m);
+	struct cdns_i3c_i2c_dev_data *data;
+	int slot;
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	slot = cdns_i3c_master_get_rr_slot(master, dev->info.dyn_addr);
+	if (slot < 0) {
+		kfree(data);
+		return slot;
+	}
+
+	data->ibi = -1;
+	data->id = slot;
+	i3c_dev_set_master_data(dev, data);
+	master->free_rr_slots &= ~BIT(slot);
+
+	if (!dev->info.dyn_addr) {
+		cdns_i3c_master_upd_i3c_addr(dev);
+		writel(readl(master->regs + DEVS_CTRL) |
+		       DEVS_CTRL_DEV_ACTIVE(data->id),
+		       master->regs + DEVS_CTRL);
+	}
+
+	return 0;
+}
+
+static void cdns_i3c_master_detach_i3c_dev(struct i3c_dev_desc *dev)
+{
+	struct i3c_master_controller *m = i3c_dev_get_master(dev);
+	struct cdns_i3c_master *master = to_cdns_i3c_master(m);
+	struct cdns_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev);
+
+	writel(readl(master->regs + DEVS_CTRL) |
+	       DEVS_CTRL_DEV_CLR(data->id),
+	       master->regs + DEVS_CTRL);
+
+	i3c_dev_set_master_data(dev, NULL);
+	master->free_rr_slots |= BIT(data->id);
+	kfree(data);
+}
+
+static int cdns_i3c_master_attach_i2c_dev(struct i2c_dev_desc *dev)
+{
+	struct i3c_master_controller *m = i2c_dev_get_master(dev);
+	struct cdns_i3c_master *master = to_cdns_i3c_master(m);
+	struct cdns_i3c_i2c_dev_data *data;
+	int slot;
+
+	slot = cdns_i3c_master_get_rr_slot(master, 0);
+	if (slot < 0)
+		return slot;
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->id = slot;
+	master->free_rr_slots &= ~BIT(slot);
+	i2c_dev_set_master_data(dev, data);
+
+	writel(prepare_rr0_dev_address(dev->boardinfo->base.addr) |
+	       (dev->boardinfo->base.flags & I2C_CLIENT_TEN ?
+		DEV_ID_RR0_LVR_EXT_ADDR : 0),
+	       master->regs + DEV_ID_RR0(data->id));
+	writel(dev->boardinfo->lvr, master->regs + DEV_ID_RR2(data->id));
+	writel(readl(master->regs + DEVS_CTRL) |
+	       DEVS_CTRL_DEV_ACTIVE(data->id),
+	       master->regs + DEVS_CTRL);
+
+	return 0;
+}
+
+static void cdns_i3c_master_detach_i2c_dev(struct i2c_dev_desc *dev)
+{
+	struct i3c_master_controller *m = i2c_dev_get_master(dev);
+	struct cdns_i3c_master *master = to_cdns_i3c_master(m);
+	struct cdns_i3c_i2c_dev_data *data = i2c_dev_get_master_data(dev);
+
+	writel(readl(master->regs + DEVS_CTRL) |
+	       DEVS_CTRL_DEV_CLR(data->id),
+	       master->regs + DEVS_CTRL);
+	master->free_rr_slots |= BIT(data->id);
+
+	i2c_dev_set_master_data(dev, NULL);
+	kfree(data);
+}
+
+static void cdns_i3c_master_bus_cleanup(struct i3c_master_controller *m)
+{
+	struct cdns_i3c_master *master = to_cdns_i3c_master(m);
+
+	cdns_i3c_master_disable(master);
+}
+
+static void cdns_i3c_master_dev_rr_to_info(struct cdns_i3c_master *master,
+					   unsigned int slot,
+					   struct i3c_device_info *info)
+{
+	u32 rr;
+
+	memset(info, 0, sizeof(*info));
+	rr = readl(master->regs + DEV_ID_RR0(slot));
+	info->dyn_addr = DEV_ID_RR0_GET_DEV_ADDR(rr);
+	rr = readl(master->regs + DEV_ID_RR2(slot));
+	info->dcr = rr;
+	info->bcr = rr >> 8;
+	info->pid = rr >> 16;
+	info->pid |= (u64)readl(master->regs + DEV_ID_RR1(slot)) << 16;
+}
+
+static void cdns_i3c_master_upd_i3c_scl_lim(struct cdns_i3c_master *master)
+{
+	struct i3c_master_controller *m = &master->base;
+	unsigned long i3c_lim_period, pres_step, ncycles;
+	unsigned long new_i3c_scl_lim = 0;
+	struct i3c_dev_desc *dev;
+	u32 prescl1, ctrl;
+
+	i3c_bus_for_each_i3cdev(m->bus, dev) {
+		unsigned long max_fscl;
+
+		max_fscl = max(I3C_CCC_MAX_SDR_FSCL(dev->info.max_read_ds),
+			       I3C_CCC_MAX_SDR_FSCL(dev->info.max_write_ds));
+		switch (max_fscl) {
+		case I3C_SDR1_FSCL_8MHZ:
+			max_fscl = 8000000;
+			break;
+		case I3C_SDR2_FSCL_6MHZ:
+			max_fscl = 6000000;
+			break;
+		case I3C_SDR3_FSCL_4MHZ:
+			max_fscl = 4000000;
+			break;
+		case I3C_SDR4_FSCL_2MHZ:
+			max_fscl = 2000000;
+			break;
+		case I3C_SDR0_FSCL_MAX:
+		default:
+			max_fscl = 0;
+			break;
+		}
+
+		if (max_fscl &&
+		    (new_i3c_scl_lim > max_fscl || !new_i3c_scl_lim))
+			new_i3c_scl_lim = max_fscl;
+	}
+
+	/* Only update PRESCL_CTRL1 if the I3C SCL limitation has changed. */
+	if (new_i3c_scl_lim == master->i3c_scl_lim)
+		return;
+	master->i3c_scl_lim = new_i3c_scl_lim;
+	if (!new_i3c_scl_lim)
+		return;
+	pres_step = 1000000000UL / (master->base.bus->scl_rate.i3c * 4);
+
+	/* Configure PP_LOW to meet I3C slave limitations. */
+	prescl1 = readl(master->regs + PRESCL_CTRL1) &
+		  ~PRESCL_CTRL1_PP_LOW_MASK;
+	ctrl = readl(master->regs + CTRL);
+
+	i3c_lim_period = DIV_ROUND_UP(1000000000, master->i3c_scl_lim);
+	ncycles = DIV_ROUND_UP(i3c_lim_period, pres_step);
+	if (ncycles < 4)
+		ncycles = 0;
+	else
+		ncycles -= 4;
+
+	prescl1 |= PRESCL_CTRL1_PP_LOW(ncycles);
+
+	/* Disable I3C master before updating PRESCL_CTRL1. */
+	if (ctrl & CTRL_DEV_EN)
+		cdns_i3c_master_disable(master);
+
+	writel(prescl1, master->regs + PRESCL_CTRL1);
+
+	if (ctrl & CTRL_DEV_EN)
+		cdns_i3c_master_enable(master);
+}
+
+static int cdns_i3c_master_do_daa(struct i3c_master_controller *m)
+{
+	struct cdns_i3c_master *master = to_cdns_i3c_master(m);
+	unsigned long old_i3c_scl_lim;
+	u32 olddevs, newdevs;
+	int ret, slot;
+	u8 addrs[MAX_DEVS] = { };
+	u8 last_addr = 0;
+
+	olddevs = readl(master->regs + DEVS_CTRL) & DEVS_CTRL_DEVS_ACTIVE_MASK;
+
+	/* Prepare RR slots before launching DAA. */
+	for (slot = 1; slot <= master->maxdevs; slot++) {
+		if (olddevs & BIT(slot))
+			continue;
+
+		ret = i3c_master_get_free_addr(m, last_addr + 1);
+		if (ret < 0)
+			return -ENOSPC;
+
+		last_addr = ret;
+		addrs[slot] = last_addr;
+		writel(prepare_rr0_dev_address(last_addr) | DEV_ID_RR0_IS_I3C,
+		       master->regs + DEV_ID_RR0(slot));
+		writel(0, master->regs + DEV_ID_RR1(slot));
+		writel(0, master->regs + DEV_ID_RR2(slot));
+	}
+
+	ret = i3c_master_entdaa_locked(&master->base);
+	if (ret && ret != I3C_ERROR_M2)
+		return ret;
+
+	newdevs = readl(master->regs + DEVS_CTRL) & DEVS_CTRL_DEVS_ACTIVE_MASK;
+	newdevs &= ~olddevs;
+
+	/* Save the old limitation before add devices. */
+	old_i3c_scl_lim = master->i3c_scl_lim;
+
+	/*
+	 * Clear all retaining registers filled during DAA. We already
+	 * have the addressed assigned to them in the addrs array.
+	 */
+	for (slot = 1; slot <= master->maxdevs; slot++) {
+		if (newdevs & BIT(slot))
+			i3c_master_add_i3c_dev_locked(m, addrs[slot]);
+	}
+
+	/*
+	 * Clear slots that ended up not being used. Can be caused by I3C
+	 * device creation failure or when the I3C device was already known
+	 * by the system but with a different address (in this case the device
+	 * already has a slot and does not need a new one).
+	 */
+	writel(readl(master->regs + DEVS_CTRL) |
+	       master->free_rr_slots << DEVS_CTRL_DEV_CLR_SHIFT,
+	       master->regs + DEVS_CTRL);
+
+	i3c_master_defslvs_locked(&master->base);
+
+	cdns_i3c_master_upd_i3c_scl_lim(master);
+
+	/* Unmask Hot-Join and Mastership request interrupts. */
+	i3c_master_enec_locked(m, I3C_BROADCAST_ADDR,
+			       I3C_CCC_EVENT_HJ | I3C_CCC_EVENT_MR);
+
+	return 0;
+}
+
+static int cdns_i3c_master_bus_init(struct i3c_master_controller *m)
+{
+	struct cdns_i3c_master *master = to_cdns_i3c_master(m);
+	unsigned long pres_step, sysclk_rate, max_i2cfreq;
+	u32 ctrl, prescl0, prescl1, pres, low;
+	struct i3c_device_info info = { };
+	int ret, ncycles;
+
+	switch (m->bus->mode) {
+	case I3C_BUS_MODE_PURE:
+		ctrl = CTRL_PURE_BUS_MODE;
+		break;
+
+	case I3C_BUS_MODE_MIXED_FAST:
+		ctrl = CTRL_MIXED_FAST_BUS_MODE;
+		break;
+
+	case I3C_BUS_MODE_MIXED_SLOW:
+		ctrl = CTRL_MIXED_SLOW_BUS_MODE;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	sysclk_rate = clk_get_rate(master->sysclk);
+	if (!sysclk_rate)
+		return -EINVAL;
+
+	pres = DIV_ROUND_UP(sysclk_rate, (m->bus->scl_rate.i3c * 4)) - 1;
+	if (pres > PRESCL_CTRL0_MAX)
+		return -ERANGE;
+
+	m->bus->scl_rate.i3c = sysclk_rate / ((pres + 1) * 4);
+
+	prescl0 = PRESCL_CTRL0_I3C(pres);
+
+	low = ((I3C_BUS_TLOW_OD_MIN_NS * sysclk_rate) / (pres + 1)) - 2;
+	prescl1 = PRESCL_CTRL1_OD_LOW(low);
+
+	max_i2cfreq = m->bus->scl_rate.i2c;
+
+	pres = (sysclk_rate / (max_i2cfreq * 5)) - 1;
+	if (pres > PRESCL_CTRL0_MAX)
+		return -ERANGE;
+
+	m->bus->scl_rate.i2c = sysclk_rate / ((pres + 1) * 5);
+
+	prescl0 |= PRESCL_CTRL0_I2C(pres);
+	writel(prescl0, master->regs + PRESCL_CTRL0);
+
+	/* Calculate OD and PP low. */
+	pres_step = 1000000000 / (m->bus->scl_rate.i3c * 4);
+	ncycles = DIV_ROUND_UP(I3C_BUS_TLOW_OD_MIN_NS, pres_step) - 2;
+	if (ncycles < 0)
+		ncycles = 0;
+	prescl1 = PRESCL_CTRL1_OD_LOW(ncycles);
+	writel(prescl1, master->regs + PRESCL_CTRL1);
+
+	/* Get an address for the master. */
+	ret = i3c_master_get_free_addr(m, 0);
+	if (ret < 0)
+		return ret;
+
+	writel(prepare_rr0_dev_address(ret) | DEV_ID_RR0_IS_I3C,
+	       master->regs + DEV_ID_RR0(0));
+
+	cdns_i3c_master_dev_rr_to_info(master, 0, &info);
+	if (info.bcr & I3C_BCR_HDR_CAP)
+		info.hdr_cap = I3C_CCC_HDR_MODE(I3C_HDR_DDR);
+
+	ret = i3c_master_set_info(&master->base, &info);
+	if (ret)
+		return ret;
+
+	/*
+	 * Enable Hot-Join, and, when a Hot-Join request happens, disable all
+	 * events coming from this device.
+	 *
+	 * We will issue ENTDAA afterwards from the threaded IRQ handler.
+	 */
+	ctrl |= CTRL_HJ_ACK | CTRL_HJ_DISEC | CTRL_HALT_EN | CTRL_MCS_EN;
+	writel(ctrl, master->regs + CTRL);
+
+	cdns_i3c_master_enable(master);
+
+	return 0;
+}
+
+static void cdns_i3c_master_handle_ibi(struct cdns_i3c_master *master,
+				       u32 ibir)
+{
+	struct cdns_i3c_i2c_dev_data *data;
+	bool data_consumed = false;
+	struct i3c_ibi_slot *slot;
+	u32 id = IBIR_SLVID(ibir);
+	struct i3c_dev_desc *dev;
+	size_t nbytes;
+	u8 *buf;
+
+	/*
+	 * FIXME: maybe we should report the FIFO OVF errors to the upper
+	 * layer.
+	 */
+	if (id >= master->ibi.num_slots || (ibir & IBIR_ERROR))
+		goto out;
+
+	dev = master->ibi.slots[id];
+	spin_lock(&master->ibi.lock);
+
+	data = i3c_dev_get_master_data(dev);
+	slot = i3c_generic_ibi_get_free_slot(data->ibi_pool);
+	if (!slot)
+		goto out_unlock;
+
+	buf = slot->data;
+
+	nbytes = IBIR_XFER_BYTES(ibir);
+	readsl(master->regs + IBI_DATA_FIFO, buf, nbytes / 4);
+	if (nbytes % 3) {
+		u32 tmp = __raw_readl(master->regs + IBI_DATA_FIFO);
+
+		memcpy(buf + (nbytes & ~3), &tmp, nbytes & 3);
+	}
+
+	slot->len = min_t(unsigned int, IBIR_XFER_BYTES(ibir),
+			  dev->ibi->max_payload_len);
+	i3c_master_queue_ibi(dev, slot);
+	data_consumed = true;
+
+out_unlock:
+	spin_unlock(&master->ibi.lock);
+
+out:
+	/* Consume data from the FIFO if it's not been done already. */
+	if (!data_consumed) {
+		int i;
+
+		for (i = 0; i < IBIR_XFER_BYTES(ibir); i += 4)
+			readl(master->regs + IBI_DATA_FIFO);
+	}
+}
+
+static void cnds_i3c_master_demux_ibis(struct cdns_i3c_master *master)
+{
+	u32 status0;
+
+	writel(MST_INT_IBIR_THR, master->regs + MST_ICR);
+
+	for (status0 = readl(master->regs + MST_STATUS0);
+	     !(status0 & MST_STATUS0_IBIR_EMP);
+	     status0 = readl(master->regs + MST_STATUS0)) {
+		u32 ibir = readl(master->regs + IBIR);
+
+		switch (IBIR_TYPE(ibir)) {
+		case IBIR_TYPE_IBI:
+			cdns_i3c_master_handle_ibi(master, ibir);
+			break;
+
+		case IBIR_TYPE_HJ:
+			WARN_ON(IBIR_XFER_BYTES(ibir) || (ibir & IBIR_ERROR));
+			queue_work(master->base.wq, &master->hj_work);
+			break;
+
+		case IBIR_TYPE_MR:
+			WARN_ON(IBIR_XFER_BYTES(ibir) || (ibir & IBIR_ERROR));
+		default:
+			break;
+		}
+	}
+}
+
+static irqreturn_t cdns_i3c_master_interrupt(int irq, void *data)
+{
+	struct cdns_i3c_master *master = data;
+	u32 status;
+
+	status = readl(master->regs + MST_ISR);
+	if (!(status & readl(master->regs + MST_IMR)))
+		return IRQ_NONE;
+
+	spin_lock(&master->xferqueue.lock);
+	cdns_i3c_master_end_xfer_locked(master, status);
+	spin_unlock(&master->xferqueue.lock);
+
+	if (status & MST_INT_IBIR_THR)
+		cnds_i3c_master_demux_ibis(master);
+
+	return IRQ_HANDLED;
+}
+
+static int cdns_i3c_master_disable_ibi(struct i3c_dev_desc *dev)
+{
+	struct i3c_master_controller *m = i3c_dev_get_master(dev);
+	struct cdns_i3c_master *master = to_cdns_i3c_master(m);
+	struct cdns_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev);
+	unsigned long flags;
+	u32 sirmap;
+	int ret;
+
+	ret = i3c_master_disec_locked(m, dev->info.dyn_addr,
+				      I3C_CCC_EVENT_SIR);
+	if (ret)
+		return ret;
+
+	spin_lock_irqsave(&master->ibi.lock, flags);
+	sirmap = readl(master->regs + SIR_MAP_DEV_REG(data->ibi));
+	sirmap &= ~SIR_MAP_DEV_CONF_MASK(data->ibi);
+	sirmap |= SIR_MAP_DEV_CONF(data->ibi,
+				   SIR_MAP_DEV_DA(I3C_BROADCAST_ADDR));
+	writel(sirmap, master->regs + SIR_MAP_DEV_REG(data->ibi));
+	spin_unlock_irqrestore(&master->ibi.lock, flags);
+
+	return ret;
+}
+
+static int cdns_i3c_master_enable_ibi(struct i3c_dev_desc *dev)
+{
+	struct i3c_master_controller *m = i3c_dev_get_master(dev);
+	struct cdns_i3c_master *master = to_cdns_i3c_master(m);
+	struct cdns_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev);
+	unsigned long flags;
+	u32 sircfg, sirmap;
+	int ret;
+
+	spin_lock_irqsave(&master->ibi.lock, flags);
+	sirmap = readl(master->regs + SIR_MAP_DEV_REG(data->ibi));
+	sirmap &= ~SIR_MAP_DEV_CONF_MASK(data->ibi);
+	sircfg = SIR_MAP_DEV_ROLE(dev->info.bcr >> 6) |
+		 SIR_MAP_DEV_DA(dev->info.dyn_addr) |
+		 SIR_MAP_DEV_PL(dev->info.max_ibi_len) |
+		 SIR_MAP_DEV_ACK;
+
+	if (dev->info.bcr & I3C_BCR_MAX_DATA_SPEED_LIM)
+		sircfg |= SIR_MAP_DEV_SLOW;
+
+	sirmap |= SIR_MAP_DEV_CONF(data->ibi, sircfg);
+	writel(sirmap, master->regs + SIR_MAP_DEV_REG(data->ibi));
+	spin_unlock_irqrestore(&master->ibi.lock, flags);
+
+	ret = i3c_master_enec_locked(m, dev->info.dyn_addr,
+				     I3C_CCC_EVENT_SIR);
+	if (ret) {
+		spin_lock_irqsave(&master->ibi.lock, flags);
+		sirmap = readl(master->regs + SIR_MAP_DEV_REG(data->ibi));
+		sirmap &= ~SIR_MAP_DEV_CONF_MASK(data->ibi);
+		sirmap |= SIR_MAP_DEV_CONF(data->ibi,
+					   SIR_MAP_DEV_DA(I3C_BROADCAST_ADDR));
+		writel(sirmap, master->regs + SIR_MAP_DEV_REG(data->ibi));
+		spin_unlock_irqrestore(&master->ibi.lock, flags);
+	}
+
+	return ret;
+}
+
+static int cdns_i3c_master_request_ibi(struct i3c_dev_desc *dev,
+				       const struct i3c_ibi_setup *req)
+{
+	struct i3c_master_controller *m = i3c_dev_get_master(dev);
+	struct cdns_i3c_master *master = to_cdns_i3c_master(m);
+	struct cdns_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev);
+	unsigned long flags;
+	unsigned int i;
+
+	data->ibi_pool = i3c_generic_ibi_alloc_pool(dev, req);
+	if (IS_ERR(data->ibi_pool))
+		return PTR_ERR(data->ibi_pool);
+
+	spin_lock_irqsave(&master->ibi.lock, flags);
+	for (i = 0; i < master->ibi.num_slots; i++) {
+		if (!master->ibi.slots[i]) {
+			data->ibi = i;
+			master->ibi.slots[i] = dev;
+			break;
+		}
+	}
+	spin_unlock_irqrestore(&master->ibi.lock, flags);
+
+	if (i < master->ibi.num_slots)
+		return 0;
+
+	i3c_generic_ibi_free_pool(data->ibi_pool);
+	data->ibi_pool = NULL;
+
+	return -ENOSPC;
+}
+
+static void cdns_i3c_master_free_ibi(struct i3c_dev_desc *dev)
+{
+	struct i3c_master_controller *m = i3c_dev_get_master(dev);
+	struct cdns_i3c_master *master = to_cdns_i3c_master(m);
+	struct cdns_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev);
+	unsigned long flags;
+
+	spin_lock_irqsave(&master->ibi.lock, flags);
+	master->ibi.slots[data->ibi] = NULL;
+	data->ibi = -1;
+	spin_unlock_irqrestore(&master->ibi.lock, flags);
+
+	i3c_generic_ibi_free_pool(data->ibi_pool);
+}
+
+static void cdns_i3c_master_recycle_ibi_slot(struct i3c_dev_desc *dev,
+					     struct i3c_ibi_slot *slot)
+{
+	struct cdns_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev);
+
+	i3c_generic_ibi_recycle_slot(data->ibi_pool, slot);
+}
+
+static const struct i3c_master_controller_ops cdns_i3c_master_ops = {
+	.bus_init = cdns_i3c_master_bus_init,
+	.bus_cleanup = cdns_i3c_master_bus_cleanup,
+	.do_daa = cdns_i3c_master_do_daa,
+	.attach_i3c_dev = cdns_i3c_master_attach_i3c_dev,
+	.reattach_i3c_dev = cdns_i3c_master_reattach_i3c_dev,
+	.detach_i3c_dev = cdns_i3c_master_detach_i3c_dev,
+	.attach_i2c_dev = cdns_i3c_master_attach_i2c_dev,
+	.detach_i2c_dev = cdns_i3c_master_detach_i2c_dev,
+	.supports_ccc_cmd = cdns_i3c_master_supports_ccc_cmd,
+	.send_ccc_cmd = cdns_i3c_master_send_ccc_cmd,
+	.priv_xfers = cdns_i3c_master_priv_xfers,
+	.i2c_xfers = cdns_i3c_master_i2c_xfers,
+	.i2c_funcs = cdns_i3c_master_i2c_funcs,
+	.enable_ibi = cdns_i3c_master_enable_ibi,
+	.disable_ibi = cdns_i3c_master_disable_ibi,
+	.request_ibi = cdns_i3c_master_request_ibi,
+	.free_ibi = cdns_i3c_master_free_ibi,
+	.recycle_ibi_slot = cdns_i3c_master_recycle_ibi_slot,
+};
+
+static void cdns_i3c_master_hj(struct work_struct *work)
+{
+	struct cdns_i3c_master *master = container_of(work,
+						      struct cdns_i3c_master,
+						      hj_work);
+
+	i3c_master_do_daa(&master->base);
+}
+
+static int cdns_i3c_master_probe(struct platform_device *pdev)
+{
+	struct cdns_i3c_master *master;
+	struct resource *res;
+	int ret, irq;
+	u32 val;
+
+	master = devm_kzalloc(&pdev->dev, sizeof(*master), GFP_KERNEL);
+	if (!master)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	master->regs = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(master->regs))
+		return PTR_ERR(master->regs);
+
+	master->pclk = devm_clk_get(&pdev->dev, "pclk");
+	if (IS_ERR(master->pclk))
+		return PTR_ERR(master->pclk);
+
+	master->sysclk = devm_clk_get(&pdev->dev, "sysclk");
+	if (IS_ERR(master->pclk))
+		return PTR_ERR(master->pclk);
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	ret = clk_prepare_enable(master->pclk);
+	if (ret)
+		return ret;
+
+	ret = clk_prepare_enable(master->sysclk);
+	if (ret)
+		goto err_disable_pclk;
+
+	if (readl(master->regs + DEV_ID) != DEV_ID_I3C_MASTER) {
+		ret = -EINVAL;
+		goto err_disable_sysclk;
+	}
+
+	spin_lock_init(&master->xferqueue.lock);
+	INIT_LIST_HEAD(&master->xferqueue.list);
+
+	INIT_WORK(&master->hj_work, cdns_i3c_master_hj);
+	writel(0xffffffff, master->regs + MST_IDR);
+	writel(0xffffffff, master->regs + SLV_IDR);
+	ret = devm_request_irq(&pdev->dev, irq, cdns_i3c_master_interrupt, 0,
+			       dev_name(&pdev->dev), master);
+	if (ret)
+		goto err_disable_sysclk;
+
+	platform_set_drvdata(pdev, master);
+
+	val = readl(master->regs + CONF_STATUS0);
+
+	/* Device ID0 is reserved to describe this master. */
+	master->maxdevs = CONF_STATUS0_DEVS_NUM(val);
+	master->free_rr_slots = GENMASK(master->maxdevs, 1);
+
+	val = readl(master->regs + CONF_STATUS1);
+	master->caps.cmdfifodepth = CONF_STATUS1_CMD_DEPTH(val);
+	master->caps.rxfifodepth = CONF_STATUS1_RX_DEPTH(val);
+	master->caps.txfifodepth = CONF_STATUS1_TX_DEPTH(val);
+	master->caps.ibirfifodepth = CONF_STATUS0_IBIR_DEPTH(val);
+	master->caps.cmdrfifodepth = CONF_STATUS0_CMDR_DEPTH(val);
+
+	spin_lock_init(&master->ibi.lock);
+	master->ibi.num_slots = CONF_STATUS1_IBI_HW_RES(val);
+	master->ibi.slots = devm_kcalloc(&pdev->dev, master->ibi.num_slots,
+					 sizeof(*master->ibi.slots),
+					 GFP_KERNEL);
+	if (!master->ibi.slots)
+		goto err_disable_sysclk;
+
+	writel(IBIR_THR(1), master->regs + CMD_IBI_THR_CTRL);
+	writel(MST_INT_IBIR_THR, master->regs + MST_IER);
+	writel(DEVS_CTRL_DEV_CLR_ALL, master->regs + DEVS_CTRL);
+
+	ret = i3c_master_register(&master->base, &pdev->dev,
+				  &cdns_i3c_master_ops, false);
+	if (ret)
+		goto err_disable_sysclk;
+
+	return 0;
+
+err_disable_sysclk:
+	clk_disable_unprepare(master->sysclk);
+
+err_disable_pclk:
+	clk_disable_unprepare(master->pclk);
+
+	return ret;
+}
+
+static int cdns_i3c_master_remove(struct platform_device *pdev)
+{
+	struct cdns_i3c_master *master = platform_get_drvdata(pdev);
+	int ret;
+
+	ret = i3c_master_unregister(&master->base);
+	if (ret)
+		return ret;
+
+	clk_disable_unprepare(master->sysclk);
+	clk_disable_unprepare(master->pclk);
+
+	return 0;
+}
+
+static const struct of_device_id cdns_i3c_master_of_ids[] = {
+	{ .compatible = "cdns,i3c-master" },
+	{ /* sentinel */ },
+};
+
+static struct platform_driver cdns_i3c_master = {
+	.probe = cdns_i3c_master_probe,
+	.remove = cdns_i3c_master_remove,
+	.driver = {
+		.name = "cdns-i3c-master",
+		.of_match_table = cdns_i3c_master_of_ids,
+	},
+};
+module_platform_driver(cdns_i3c_master);
+
+MODULE_AUTHOR("Boris Brezillon <boris.brezillon@bootlin.com>");
+MODULE_DESCRIPTION("Cadence I3C master driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:cdns-i3c-master");
-- 
2.14.1