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Date: Thu, 14 Dec 2017 16:16:09 +0100
From: Boris Brezillon <boris.brezillon@...e-electrons.com>
To: Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org,
Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Arnd Bergmann <arnd@...db.de>
Cc: Przemyslaw Sroka <psroka@...ence.com>,
Arkadiusz Golec <agolec@...ence.com>,
Alan Douglas <adouglas@...ence.com>,
Bartosz Folta <bfolta@...ence.com>,
Damian Kos <dkos@...ence.com>,
Alicja Jurasik-Urbaniak <alicja@...ence.com>,
Cyprian Wronka <cwronka@...ence.com>,
Suresh Punnoose <sureshp@...ence.com>,
Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
Nishanth Menon <nm@...com>, Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
Vitor Soares <Vitor.Soares@...opsys.com>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Linus Walleij <linus.walleij@...aro.org>,
Boris Brezillon <boris.brezillon@...e-electrons.com>
Subject: [PATCH v2 6/7] i3c: master: Add driver for Cadence IP
Add a driver for Cadence I3C master IP.
Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
---
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 | 5 +
drivers/i3c/master/Makefile | 1 +
drivers/i3c/master/i3c-master-cdns.c | 1797 ++++++++++++++++++++++++++++++++++
3 files changed, 1803 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..56b9a18543b2 100644
--- a/drivers/i3c/master/Kconfig
+++ b/drivers/i3c/master/Kconfig
@@ -0,0 +1,5 @@
+config CDNS_I3C_MASTER
+ tristate "Cadence I3C master driver"
+ depends on I3C
+ 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..3e3ef37c01c2
--- /dev/null
+++ b/drivers/i3c/master/i3c-master-cdns.c
@@ -0,0 +1,1797 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2017 Cadence Design Systems Inc.
+ *
+ * Author: Boris Brezillon <boris.brezillon@...e-electrons.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/i3c/master.h>
+#include <linux/interrupt.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#define DEV_ID 0x0
+#define DEV_ID_I3C_MASTER 0x5034
+
+#define CONF_STATUS0 0x4
+#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_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_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_M0_ERR BIT(28)
+#define MST_INT_RX_THR BIT(24)
+#define MST_INT_TX_THR BIT(23)
+#define MST_INT_IBI_THR BIT(22)
+#define MST_INT_CMD_THR BIT(21)
+#define MST_INT_RX_UNF BIT(20)
+#define MST_INT_TX_OVF BIT(19)
+#define MST_INT_IBI_UNF BIT(18)
+#define MST_INT_CMD_OVF BIT(17)
+#define MST_INT_CMD_EMPTY BIT(16)
+#define MST_INT_MR_DONE BIT(11)
+#define MST_INT_IBI_FAIL BIT(10)
+#define MST_INT_SDR_FAIL BIT(9)
+#define MST_INT_DDR_FAIL BIT(8)
+#define MST_INT_HJ_REQ BIT(7)
+#define MST_INT_MR_REQ BIT(6)
+#define MST_INT_IBI_REQ BIT(5)
+#define MST_INT_BUS_DISCR BIT(4)
+#define MST_INT_INVALID_DA BIT(3)
+#define MST_INT_RD_ABORT BIT(2)
+#define MST_INT_NACK BIT(1)
+#define MST_INT_COMP BIT(0)
+
+#define MST_INT_XFER_STATUS (MST_INT_M0_ERR | \
+ MST_INT_SDR_FAIL | \
+ MST_INT_DDR_FAIL | \
+ MST_INT_INVALID_DA | \
+ MST_INT_RD_ABORT | \
+ MST_INT_NACK | \
+ MST_INT_COMP)
+
+#define MST_STATUS0 0x34
+#define MST_STATUS0_IDLE BIT(31)
+#define MST_STATUS0_HALTED BIT(30)
+#define MST_STATUS0_MASTER_MODE BIT(29)
+#define MST_STATUS0_IMM_COMP BIT(28)
+#define MST_STATUS0_DDR_ERR_ID(s) ((s) & GENMASK(27, 25) >> 25)
+#define MST_STATUS0_DAA_COMP BIT(24)
+#define MST_STATUS0_IBI_FIFO_FULL BIT(23)
+#define MST_STATUS0_RX_FIFO_FULL BIT(22)
+#define MST_STATUS0_XFER_BYTES(s) ((s) & GENMASK(21, 10) >> 10)
+#define MST_STATUS0_DEV_ADDR(s) ((s) & GENMASK(9, 0))
+
+#define SIR_STATUS 0x3c
+#define SIR_STATUS_DEV(d) BIT(d)
+
+#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_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_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_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 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_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_ALL GENMASK(31, 16)
+#define DEVS_CTRL_DEV_CLR(dev) BIT(16 + (dev))
+#define DEVS_CTRL_DEV_ACTIVE(dev) BIT(dev)
+
+#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_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 txfifodepth;
+ u32 rxfifodepth;
+};
+
+struct cdns_i3c_cmd {
+ u32 cmd0;
+ u32 cmd1;
+ u32 tx_len;
+ const void *tx_buf;
+ u32 rx_len;
+ void *rx_buf;
+};
+
+struct cdns_i3c_xfer {
+ struct list_head node;
+ struct completion comp;
+ u32 isr;
+ unsigned int ncmds;
+ struct cdns_i3c_cmd cmds[0];
+};
+
+struct cdns_i3c_master {
+ struct work_struct hj_work;
+ struct i3c_master_controller base;
+ unsigned long free_dev_slots;
+ struct {
+ unsigned int num_slots;
+ struct i3c_device **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)
+{
+ int i, j;
+
+ for (i = 0; i < nbytes; i += 4) {
+ u32 data = 0;
+
+ for (j = 0; j < 4 && (i + j) < nbytes; j++)
+ data |= (u32)bytes[i + j] << (j * 8);
+
+ writel(data, master->regs + TX_FIFO);
+ }
+}
+
+static void cdns_i3c_master_drain_rx_fifo(struct cdns_i3c_master *master)
+{
+ int i;
+
+ for (i = 0; i < master->caps.rxfifodepth; i++) {
+ readl(master->regs + RX_FIFO);
+ if (readl(master->regs + MST_ISR) & MST_INT_RX_UNF) {
+ writel(MST_INT_RX_UNF, master->regs + MST_ICR);
+ break;
+ }
+ }
+}
+
+static void cdns_i3c_master_rd_from_rx_fifo(struct cdns_i3c_master *master,
+ u8 *bytes, int nbytes)
+{
+ u32 status0;
+ int i, j;
+
+ status0 = readl(master->regs + MST_STATUS0);
+
+ if (nbytes > MST_STATUS0_XFER_BYTES(status0))
+ nbytes = MST_STATUS0_XFER_BYTES(status0);
+
+ for (i = 0; i < nbytes; i += 4) {
+ u32 data;
+
+ data = readl(master->regs + RX_FIFO);
+
+ for (j = 0; j < 4 && (i + j) < nbytes; j++)
+ bytes[i + j] = data >> (j * 8);
+ }
+}
+
+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;
+
+ 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_XFER_STATUS | MST_INT_CMD_EMPTY,
+ 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, master->regs + CMD1_FIFO);
+ writel(cmd->cmd0, master->regs + CMD0_FIFO);
+ }
+
+ writel(MST_INT_CMD_EMPTY | MST_INT_RD_ABORT, 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;
+
+ if (!xfer)
+ return;
+
+ isr &= MST_INT_XFER_STATUS | MST_INT_CMD_EMPTY;
+ if (!isr)
+ return;
+
+ writel(MST_INT_CMD_EMPTY | MST_INT_RD_ABORT, master->regs + MST_IDR);
+ xfer->isr = isr & ~MST_INT_CMD_EMPTY;
+
+ if (xfer->isr & MST_INT_RD_ABORT) {
+ writel(FLUSH_RX_FIFO | FLUSH_TX_FIFO | FLUSH_CMD_FIFO,
+ master->regs + FLUSH_CTRL);
+ writel(readl(master->regs + CTRL) | CTRL_DEV_EN,
+ master->regs + CTRL);
+ } else if (xfer->isr != MST_INT_COMP) {
+ cdns_i3c_master_drain_rx_fifo(master);
+ } else {
+ unsigned int i;
+
+ for (i = 0; i < xfer->ncmds; i++) {
+ struct cdns_i3c_cmd *cmd = &xfer->cmds[i];
+
+ cdns_i3c_master_rd_from_rx_fifo(master, cmd->rx_buf,
+ cmd->rx_len);
+ }
+ }
+
+ 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,
+ master->regs + FLUSH_CTRL);
+ writel(MST_INT_CMD_EMPTY | MST_INT_RD_ABORT,
+ 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 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);
+
+ /*
+ * MST_INT_NACK is not an error when doing DAA, it just means "no i3c
+ * devices on the bus".
+ */
+ if (xfer->isr == MST_INT_COMP)
+ ret = 0;
+ else if (xfer->isr)
+ ret = -EIO;
+ else
+ ret = -ETIMEDOUT;
+
+ cdns_i3c_master_free_xfer(xfer);
+
+ return ret;
+}
+
+static int cdns_i3c_master_contig_priv_xfers(struct cdns_i3c_master *master,
+ const struct i3c_priv_xfer *xfers,
+ int nxfers)
+{
+ struct cdns_i3c_xfer *xfer;
+ unsigned int i;
+ int ret;
+
+ 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[i];
+ u32 pl_len = xfers[i].len;
+
+ ccmd->cmd0 = CMD0_FIFO_DEV_ADDR(xfers[i].addr) |
+ CMD0_FIFO_PRIV_XMIT_MODE(XMIT_BURST_WITHOUT_SUBADDR);
+
+ if (xfers[i].flags & I3C_PRIV_XFER_READ) {
+ 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, xfer);
+ if (!wait_for_completion_timeout(&xfer->comp, msecs_to_jiffies(1000)))
+ cdns_i3c_master_unqueue_xfer(master, xfer);
+
+ if (!xfer->isr)
+ ret = -ETIMEDOUT;
+ else if (xfer->isr &
+ (MST_INT_NACK | MST_INT_RD_ABORT | MST_INT_INVALID_DA))
+ ret = -EIO;
+ else
+ ret = 0;
+
+ cdns_i3c_master_free_xfer(xfer);
+
+ return ret;
+}
+
+static int cdns_i3c_master_priv_xfers(struct i3c_master_controller *m,
+ const struct i3c_priv_xfer *xfers,
+ int nxfers)
+{
+ struct cdns_i3c_master *master = to_cdns_i3c_master(m);
+ int tnxfers = 0, tntx = 0, tnrx = 0, j = 0, i, ret = 0;
+
+ for (i = 0; i < nxfers; i++) {
+ if (xfers[i].len > CMD0_FIFO_PL_LEN_MAX)
+ return -ENOTSUPP;
+ }
+
+ if (!nxfers)
+ return 0;
+
+ /*
+ * First make sure that all transactions (block of transfers separated
+ * by a STOP marker) fit in the FIFOs.
+ */
+ for (i = 0; i < nxfers; i++) {
+ tnxfers++;
+
+ if (xfers[i].flags & I3C_PRIV_XFER_READ)
+ tnrx += DIV_ROUND_UP(xfers[i].len, 4);
+ else
+ tntx += DIV_ROUND_UP(xfers[i].len, 4);
+
+ if (!(xfers[i].flags & I3C_PRIV_XFER_STOP) &&
+ i < nxfers - 1)
+ continue;
+
+ if (tnxfers > master->caps.cmdfifodepth ||
+ tnrx > master->caps.rxfifodepth ||
+ tntx > master->caps.txfifodepth)
+ return -ENOTSUPP;
+
+ tnxfers = 0;
+ tntx = 0;
+ tnrx = 0;
+ }
+
+ for (i = 0, j = 0; i < nxfers; i++) {
+ if (!(xfers[i].flags & I3C_PRIV_XFER_STOP) && i < nxfers - 1)
+ continue;
+
+ ret = cdns_i3c_master_contig_priv_xfers(master, xfers + j,
+ i + 1 - j);
+ if (ret)
+ return ret;
+
+ j = i;
+ }
+
+ return 0;
+}
+
+#define I3C_DDR_FIRST_DATA_WORD_PREAMBLE 0x2
+#define I3C_DDR_DATA_WORD_PREAMBLE 0x3
+
+#define I3C_DDR_PREAMBLE(p) ((p) << 18)
+
+static u32 prepare_ddr_word(u16 payload)
+{
+ u32 ret;
+ u16 pb;
+
+ ret = (u32)payload << 2;
+
+ /* Calculate parity. */
+ pb = (payload >> 15) ^ (payload >> 13) ^ (payload >> 11) ^
+ (payload >> 9) ^ (payload >> 7) ^ (payload >> 5) ^
+ (payload >> 3) ^ (payload >> 1);
+ ret |= (pb & 1) << 1;
+ pb = (payload >> 14) ^ (payload >> 12) ^ (payload >> 10) ^
+ (payload >> 8) ^ (payload >> 6) ^ (payload >> 4) ^
+ (payload >> 2) ^ payload ^ 1;
+ ret |= (pb & 1);
+
+ return ret;
+}
+
+static u32 prepare_ddr_data_word(u16 data, bool first)
+{
+ return prepare_ddr_word(data) | I3C_DDR_PREAMBLE(first ? 2 : 3);
+}
+
+#define I3C_DDR_READ_CMD BIT(15)
+
+static u32 prepare_ddr_cmd_word(u16 cmd)
+{
+ return prepare_ddr_word(cmd) | I3C_DDR_PREAMBLE(1);
+}
+
+static u32 prepare_ddr_crc_word(u8 crc5)
+{
+ return (((u32)crc5 & 0x1f) << 9) | (0xc << 14) |
+ I3C_DDR_PREAMBLE(1);
+}
+
+static u8 update_crc5(u8 crc5, u16 word)
+{
+ u8 crc0;
+ int i;
+
+ /*
+ * crc0 = next_data_bit ^ crc[4]
+ * 1 2 3 4
+ * crc[4:0] = { crc[3:2], crc[1]^crc0, crc[0], crc0 }
+ */
+ for (i = 0; i < 16; ++i) {
+ crc0 = ((word >> (15 - i)) ^ (crc5 >> 4)) & 0x1;
+ crc5 = ((crc5 << 1) & (0x18 | 0x2)) |
+ (((crc5 >> 1) ^ crc0) << 2) | crc0;
+ }
+
+ return crc5 & 0x1F;
+}
+
+static int cdns_i3c_master_send_hdr_cmd(struct i3c_master_controller *m,
+ const struct i3c_hdr_cmd *cmds,
+ int ncmds)
+{
+ struct cdns_i3c_master *master = to_cdns_i3c_master(m);
+ int ret, i, ntxwords = 1, nrxwords = 0;
+ struct cdns_i3c_xfer *xfer;
+ struct cdns_i3c_cmd *ccmd;
+ u16 cmdword, datain;
+ u32 checkword, word;
+ u32 *buf = NULL;
+ u8 crc5;
+
+ if (ncmds < 1)
+ return 0;
+
+ if (ncmds > 1 || cmds[0].ndatawords > CMD0_FIFO_PL_LEN_MAX)
+ return -ENOTSUPP;
+
+ if (cmds[0].mode != I3C_HDR_DDR)
+ return -ENOTSUPP;
+
+ cmdword = ((u16)cmds[0].code << 8) | (cmds[0].addr << 1);
+ if (cmdword & I3C_DDR_READ_CMD)
+ nrxwords += cmds[0].ndatawords + 1;
+ else
+ ntxwords += cmds[0].ndatawords + 1;
+
+ if (ntxwords > master->caps.txfifodepth ||
+ nrxwords > master->caps.rxfifodepth)
+ return -ENOTSUPP;
+
+ buf = kzalloc((nrxwords + ntxwords) * sizeof(*buf), GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ xfer = cdns_i3c_master_alloc_xfer(master, 2);
+ if (!xfer) {
+ ret = -ENOMEM;
+ goto out_free_buf;
+ }
+
+ ccmd = &xfer->cmds[0];
+ ccmd->cmd1 = CMD1_FIFO_CCC(I3C_CCC_ENTHDR(0));
+ ccmd->cmd0 = CMD0_FIFO_IS_CCC;
+
+ ccmd = &xfer->cmds[1];
+
+ if (cmdword & I3C_DDR_READ_CMD) {
+ u16 pb;
+
+ pb = (cmdword >> 14) ^ (cmdword >> 12) ^ (cmdword >> 10) ^
+ (cmdword >> 8) ^ (cmdword >> 6) ^ (cmdword >> 4) ^
+ (cmdword >> 2);
+
+ if (pb & 1)
+ cmdword |= BIT(0);
+ }
+
+ ccmd->tx_len = ntxwords * sizeof(u32);
+ ccmd->tx_buf = buf;
+ ccmd->rx_len = nrxwords * sizeof(u32);
+ ccmd->rx_buf = buf + ntxwords;
+
+ buf[0] = prepare_ddr_cmd_word(cmdword);
+ crc5 = update_crc5(0x1f, cmdword);
+ for (i = 0; i < ntxwords - 2; i++) {
+ crc5 = update_crc5(crc5, cmds[0].data.out[i]);
+ buf[i + 1] = prepare_ddr_data_word(cmds[0].data.out[i], !i);
+ }
+
+ ccmd->cmd0 = CMD0_FIFO_IS_DDR | CMD0_FIFO_PL_LEN(ntxwords);
+
+ 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);
+
+ if (xfer->isr == MST_INT_COMP) {
+ ret = 0;
+ for (i = 0; i < nrxwords; i++) {
+ word = ((u32 *)ccmd->rx_buf)[i];
+ datain = (word >> 2) & GENMASK(15, 0);
+ if (i < nrxwords - 1) {
+ checkword = prepare_ddr_data_word(datain, !i);
+ word &= GENMASK(19, 0);
+ } else {
+ checkword = prepare_ddr_crc_word(crc5);
+ word &= GENMASK(19, 7);
+ }
+
+ if (checkword != word) {
+ ret = -EIO;
+ break;
+ }
+
+ if (i < nrxwords - 1) {
+ crc5 = update_crc5(crc5, datain);
+ cmds[0].data.in[i] = datain;
+ }
+ }
+ } else if (!xfer->isr) {
+ ret = -ETIMEDOUT;
+ } else {
+ ret = -EIO;
+ }
+
+ cdns_i3c_master_free_xfer(xfer);
+
+out_free_buf:
+ kfree(buf);
+
+ return ret;
+}
+
+static int cdns_i3c_master_i2c_xfers(struct i3c_master_controller *m,
+ const struct i2c_msg *xfers, int nxfers)
+{
+ 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);
+
+ if (xfer->isr & MST_INT_NACK)
+ ret = -EIO;
+ else if (!(xfer->isr & MST_INT_COMP))
+ ret = -ETIMEDOUT;
+
+ cdns_i3c_master_free_xfer(xfer);
+
+ return ret;
+}
+
+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 int cdns_i3c_master_attach_i3c_dev(struct cdns_i3c_master *master,
+ struct i3c_device *dev)
+{
+ struct cdns_i3c_i2c_dev_data *data;
+ u32 val;
+
+ if (!master->free_dev_slots)
+ return -ENOMEM;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->id = ffs(master->free_dev_slots) - 1;
+ clear_bit(data->id, &master->free_dev_slots);
+ i3c_device_set_master_data(dev, data);
+
+ if (dev->info.dyn_addr)
+ val = prepare_rr0_dev_address(dev->info.dyn_addr) |
+ DEV_ID_RR0_IS_I3C;
+ else
+ val = prepare_rr0_dev_address(dev->info.static_addr);
+
+ if (dev->info.dcr & I3C_BCR_HDR_CAP)
+ val |= DEV_ID_RR0_HDR_CAP;
+
+ writel(val, master->regs + DEV_ID_RR0(data->id));
+ writel(DEV_ID_RR1_PID_MSB(dev->info.pid),
+ master->regs + DEV_ID_RR1(data->id));
+ writel(DEV_ID_RR2_DCR(dev->info.dcr) | DEV_ID_RR2_BCR(dev->info.bcr) |
+ DEV_ID_RR2_PID_LSB(dev->info.pid),
+ 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_i3c_dev(struct cdns_i3c_master *master,
+ struct i3c_device *dev)
+{
+ struct cdns_i3c_i2c_dev_data *data = i3c_device_get_master_data(dev);
+
+ if (!data)
+ return;
+
+ set_bit(data->id, &master->free_dev_slots);
+ writel(readl(master->regs + DEVS_CTRL) |
+ DEVS_CTRL_DEV_CLR(data->id),
+ master->regs + DEVS_CTRL);
+
+ i3c_device_set_master_data(dev, NULL);
+ kfree(data);
+}
+
+static int cdns_i3c_master_attach_i2c_dev(struct cdns_i3c_master *master,
+ struct i2c_device *dev)
+{
+ struct cdns_i3c_i2c_dev_data *data;
+
+ if (!master->free_dev_slots)
+ return -ENOMEM;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->id = ffs(master->free_dev_slots) - 1;
+ clear_bit(data->id, &master->free_dev_slots);
+ i2c_device_set_master_data(dev, data);
+
+ writel(prepare_rr0_dev_address(dev->info.addr) |
+ (dev->info.flags & I2C_CLIENT_TEN ? DEV_ID_RR0_LVR_EXT_ADDR : 0),
+ master->regs + DEV_ID_RR0(data->id));
+ writel(dev->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 cdns_i3c_master *master,
+ struct i2c_device *dev)
+{
+ struct cdns_i3c_i2c_dev_data *data = i2c_device_get_master_data(dev);
+
+ if (!data)
+ return;
+
+ set_bit(data->id, &master->free_dev_slots);
+ writel(readl(master->regs + DEVS_CTRL) |
+ DEVS_CTRL_DEV_CLR(data->id),
+ master->regs + DEVS_CTRL);
+
+ i2c_device_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);
+ struct i2c_device *i2cdev;
+ struct i3c_device *i3cdev;
+
+ cdns_i3c_master_disable(master);
+
+ i3c_bus_for_each_i2cdev(m->bus, i2cdev)
+ cdns_i3c_master_detach_i2c_dev(master, i2cdev);
+
+ i3c_bus_for_each_i3cdev(m->bus, i3cdev)
+ cdns_i3c_master_detach_i3c_dev(master, i3cdev);
+}
+
+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 int cdns_i3c_master_do_daa_locked(struct cdns_i3c_master *master)
+{
+ unsigned long i3c_lim_period, pres_step, i3c_scl_lim;
+ struct i3c_device_info devinfo;
+ struct i3c_device *i3cdev;
+ u32 prescl1, ctrl, devs;
+ int ret, slot, ncycles;
+
+ ret = i3c_master_entdaa_locked(&master->base);
+ if (ret)
+ return ret;
+
+ /* Now, add discovered devices to the bus. */
+ i3c_scl_lim = master->i3c_scl_lim;
+ devs = readl(master->regs + DEVS_CTRL);
+ for (slot = find_next_bit(&master->free_dev_slots, BITS_PER_LONG, 1);
+ slot < BITS_PER_LONG;
+ slot = find_next_bit(&master->free_dev_slots,
+ BITS_PER_LONG, slot + 1)) {
+ struct cdns_i3c_i2c_dev_data *data;
+ u32 rr, max_fscl = 0;
+ u8 addr;
+
+ if (!(devs & DEVS_CTRL_DEV_ACTIVE(slot)))
+ continue;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->ibi = -1;
+ data->id = slot;
+ rr = readl(master->regs + DEV_ID_RR0(slot));
+ addr = DEV_ID_RR0_GET_DEV_ADDR(rr);
+ i3cdev = i3c_master_add_i3c_dev_locked(&master->base, addr);
+ if (IS_ERR(i3cdev))
+ return PTR_ERR(i3cdev);
+
+ i3c_device_get_info(i3cdev, &devinfo);
+ clear_bit(data->id, &master->free_dev_slots);
+ i3c_device_set_master_data(i3cdev, data);
+
+ max_fscl = max(I3C_CCC_MAX_SDR_FSCL(devinfo.max_read_ds),
+ I3C_CCC_MAX_SDR_FSCL(devinfo.max_write_ds));
+ switch (max_fscl) {
+ case I3C_SDR_DR_FSCL_8MHZ:
+ max_fscl = 8000000;
+ break;
+ case I3C_SDR_DR_FSCL_6MHZ:
+ max_fscl = 6000000;
+ break;
+ case I3C_SDR_DR_FSCL_4MHZ:
+ max_fscl = 4000000;
+ break;
+ case I3C_SDR_DR_FSCL_2MHZ:
+ max_fscl = 2000000;
+ break;
+ case I3C_SDR_DR_FSCL_MAX:
+ default:
+ max_fscl = 0;
+ break;
+ }
+
+ if (max_fscl && (max_fscl < i3c_scl_lim || !i3c_scl_lim))
+ i3c_scl_lim = max_fscl;
+ }
+
+ i3c_master_defslvs_locked(&master->base);
+
+ pres_step = 1000000000 / (master->base.bus->scl_rate.i3c * 4);
+
+ /* No bus limitation to apply, bail out. */
+ if (!i3c_scl_lim ||
+ (master->i3c_scl_lim && master->i3c_scl_lim <= i3c_scl_lim))
+ return 0;
+
+ /* Configure PP_LOW to meet I3C slave limitations. */
+ prescl1 = readl(master->regs + PRESCL_CTRL1) &
+ ~PRESCL_CTRL1_PP_LOW_MASK;
+ ctrl = readl(master->regs + CTRL) & ~CTRL_DEV_EN;
+
+ i3c_lim_period = DIV_ROUND_UP(1000000000, i3c_scl_lim);
+ ncycles = DIV_ROUND_UP(i3c_lim_period, pres_step) - 4;
+ if (ncycles < 0)
+ ncycles = 0;
+ prescl1 |= PRESCL_CTRL1_PP_LOW(ncycles);
+
+ /* Disable I3C master before updating PRESCL_CTRL1. */
+ ret = cdns_i3c_master_disable(master);
+ if (!ret) {
+ writel(prescl1, master->regs + PRESCL_CTRL1);
+ master->i3c_scl_lim = i3c_scl_lim;
+ }
+ cdns_i3c_master_enable(master);
+
+ return ret;
+}
+
+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 = { };
+ struct i3c_ccc_events events;
+ struct i2c_device *i2cdev;
+ struct i3c_device *i3cdev;
+ int ret, slot, ncycles;
+ u8 last_addr = 0;
+
+ 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(DEVS_CTRL_DEV_CLR_ALL, master->regs + DEVS_CTRL);
+
+ i3c_bus_for_each_i2cdev(m->bus, i2cdev) {
+ ret = cdns_i3c_master_attach_i2c_dev(master, i2cdev);
+ if (ret)
+ goto err_detach_devs;
+ }
+
+ 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);
+
+ i3c_bus_for_each_i3cdev(m->bus, i3cdev) {
+ ret = cdns_i3c_master_attach_i3c_dev(master, i3cdev);
+ if (ret)
+ goto err_detach_devs;
+ }
+
+ /* Get an address for the master. */
+ ret = i3c_master_get_free_addr(m, 0);
+ if (ret < 0)
+ goto err_detach_devs;
+
+ 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)
+ goto err_detach_devs;
+
+ /* Prepare RR slots before lauching DAA. */
+ for (slot = find_next_bit(&master->free_dev_slots, BITS_PER_LONG, 1);
+ slot < BITS_PER_LONG;
+ slot = find_next_bit(&master->free_dev_slots,
+ BITS_PER_LONG, slot + 1)) {
+ ret = i3c_master_get_free_addr(m, last_addr + 1);
+ if (ret < 0)
+ goto err_disable_master;
+
+ last_addr = ret;
+ 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));
+ }
+
+ /*
+ * Enable Hot-Join and when a Hot-Join request happen, 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;
+ writel(ctrl, master->regs + CTRL);
+
+ cdns_i3c_master_enable(master);
+
+ /*
+ * Reset all dynamic addresses on the bus, because we don't know what
+ * happened before this point (the bootloader may have assigned dynamic
+ * addresses that we're not aware of).
+ */
+ ret = i3c_master_rstdaa_locked(m, I3C_BROADCAST_ADDR);
+ if (ret)
+ goto err_disable_master;
+
+ /* Disable all slave events (interrupts) before starting DAA. */
+ events.events = I3C_CCC_EVENT_SIR | I3C_CCC_EVENT_MR |
+ I3C_CCC_EVENT_HJ;
+ ret = i3c_master_disec_locked(m, I3C_BROADCAST_ADDR, &events);
+ if (ret)
+ goto err_disable_master;
+
+ ret = cdns_i3c_master_do_daa_locked(master);
+ if (ret < 0)
+ goto err_disable_master;
+
+ /* Unmask Hot-Join and Marstership request interrupts. */
+ events.events = I3C_CCC_EVENT_HJ | I3C_CCC_EVENT_MR;
+ ret = i3c_master_enec_locked(m, I3C_BROADCAST_ADDR, &events);
+ if (ret)
+ pr_info("Failed to re-enable H-J");
+
+ writel(MST_INT_HJ_REQ, master->regs + MST_IER);
+ return 0;
+
+err_disable_master:
+ cdns_i3c_master_disable(master);
+
+err_detach_devs:
+ cdns_i3c_master_bus_cleanup(m);
+
+ return ret;
+}
+
+static void cnds_i3c_master_demux_ibis(struct cdns_i3c_master *master)
+{
+ unsigned int i, sirstatus;
+
+ writel(MST_INT_IBI_REQ, master->regs + MST_ICR);
+ sirstatus = readl(master->regs + SIR_STATUS);
+
+ /*
+ * The IBI logic is broken, and if more than one device sent an
+ * IBI, there's simply no way we can determine which one came in first.
+ * In this case, drop all IBIs and flush the FIFO.
+ */
+ if (hweight32(sirstatus) > 1) {
+ writel(readl(master->regs + CTRL) & ~CTRL_DEV_EN,
+ master->regs + CTRL);
+ writel(FLUSH_IBI_FIFO, master->regs + FLUSH_CTRL);
+ writel(sirstatus, master->regs + SIR_STATUS);
+ writel(readl(master->regs + CTRL) | CTRL_DEV_EN,
+ master->regs + CTRL);
+ return;
+ }
+
+ spin_lock(&master->ibi.lock);
+ for (i = 0; i < master->ibi.num_slots; i++) {
+ struct i3c_device *dev = master->ibi.slots[i];
+ struct cdns_i3c_i2c_dev_data *data;
+ struct i3c_ibi_slot *slot;
+ unsigned int len, j;
+ u8 *buf;
+ u32 tmp;
+
+ if (!(sirstatus & BIT(i)) || !dev)
+ continue;
+
+ data = i3c_device_get_master_data(dev);
+ slot = i3c_generic_ibi_get_free_slot(data->ibi_pool);
+ if (!slot)
+ continue;
+
+ buf = slot->data;
+ for (len = 0; len < dev->ibi->max_payload_len;) {
+ tmp = readl(master->regs + IBI_DATA_FIFO);
+ if (readl(master->regs + MST_ISR) & MST_INT_IBI_UNF) {
+ writel(MST_INT_IBI_UNF, master->regs + MST_ICR);
+ break;
+ }
+
+ for (j = 0; j < 4 && len < dev->ibi->max_payload_len;
+ j++, len++)
+ buf[len] = tmp >> (j * 8);
+ }
+
+ slot->len = len;
+ i3c_device_queue_ibi(dev, slot);
+ }
+
+ spin_unlock(&master->ibi.lock);
+
+ writel(FLUSH_IBI_FIFO, master->regs + FLUSH_CTRL);
+ writel(sirstatus, master->regs + SIR_STATUS);
+}
+
+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_HJ_REQ) {
+ writel(MST_INT_HJ_REQ, master->regs + MST_IDR);
+ queue_work(master->base.wq, &master->hj_work);
+ }
+
+ if (status & MST_INT_IBI_REQ)
+ cnds_i3c_master_demux_ibis(master);
+
+ return IRQ_HANDLED;
+}
+
+int cdns_i3c_master_disable_ibi(struct i3c_master_controller *m,
+ struct i3c_device *dev)
+{
+ struct i3c_ccc_events events = { .events = I3C_CCC_EVENT_SIR };
+ struct cdns_i3c_master *master = to_cdns_i3c_master(m);
+ struct cdns_i3c_i2c_dev_data *data = i3c_device_get_master_data(dev);
+ struct i3c_device_info devinfo;
+ unsigned long flags;
+ u32 sirmap;
+ int ret;
+
+ i3c_bus_normaluse_lock(m->bus);
+ i3c_device_get_info(dev, &devinfo);
+ ret = i3c_master_disec_locked(m, devinfo.dyn_addr, &events);
+ if (ret)
+ goto out;
+
+ 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);
+
+out:
+ i3c_bus_normaluse_unlock(m->bus);
+
+ return ret;
+}
+
+int cdns_i3c_master_enable_ibi(struct i3c_master_controller *m,
+ struct i3c_device *dev)
+{
+ struct i3c_ccc_events events = { .events = I3C_CCC_EVENT_SIR };
+ struct cdns_i3c_master *master = to_cdns_i3c_master(m);
+ struct cdns_i3c_i2c_dev_data *data = i3c_device_get_master_data(dev);
+ struct i3c_device_info devinfo;
+ unsigned long flags;
+ u32 sircfg, sirmap;
+ int ret;
+
+ i3c_bus_normaluse_lock(m->bus);
+ i3c_device_get_info(dev, &devinfo);
+ 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(devinfo.bcr >> 6) |
+ SIR_MAP_DEV_DA(devinfo.dyn_addr) |
+ SIR_MAP_DEV_PL(devinfo.max_ibi_len) |
+ SIR_MAP_DEV_ACK;
+ if (devinfo.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, devinfo.dyn_addr, &events);
+ if (ret)
+ goto err_reset_sircfg;
+ i3c_bus_normaluse_unlock(m->bus);
+
+ return 0;
+
+err_reset_sircfg:
+ 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);
+ i3c_bus_normaluse_unlock(m->bus);
+
+ return ret;
+}
+
+int cdns_i3c_master_request_ibi(struct i3c_master_controller *m,
+ struct i3c_device *dev,
+ const struct i3c_ibi_setup *req)
+{
+ struct cdns_i3c_master *master = to_cdns_i3c_master(m);
+ struct cdns_i3c_i2c_dev_data *data = i3c_device_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_master_controller *m,
+ struct i3c_device *dev)
+{
+ struct cdns_i3c_master *master = to_cdns_i3c_master(m);
+ struct cdns_i3c_i2c_dev_data *data = i3c_device_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_master_controller *m,
+ struct i3c_device *dev,
+ struct i3c_ibi_slot *slot)
+{
+ struct cdns_i3c_i2c_dev_data *data = i3c_device_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,
+ .supports_ccc_cmd = cdns_i3c_master_supports_ccc_cmd,
+ .send_ccc_cmd = cdns_i3c_master_send_ccc_cmd,
+ .send_hdr_cmds = cdns_i3c_master_send_hdr_cmd,
+ .priv_xfers = cdns_i3c_master_priv_xfers,
+ .i2c_xfers = cdns_i3c_master_i2c_xfers,
+ .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);
+ struct i3c_bus *bus = i3c_master_get_bus(&master->base);
+ u32 status;
+
+ status = readl(master->regs + MST_ISR);
+ if (!(status & MST_INT_HJ_REQ))
+ return;
+
+ i3c_bus_maintenance_lock(bus);
+ writel(MST_INT_HJ_REQ, master->regs + MST_ICR);
+ cdns_i3c_master_do_daa_locked(master);
+ i3c_master_register_new_i3c_devs(&master->base);
+ i3c_bus_maintenance_unlock(bus);
+}
+
+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->free_dev_slots = GENMASK(CONF_STATUS0_DEVS_NUM(val), 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);
+
+ spin_lock_init(&master->ibi.lock);
+ master->ibi.num_slots = CONF_STATUS1_IBI_HW_RES(val);
+ master->ibi.slots = devm_kzalloc(&pdev->dev,
+ sizeof(*master->ibi.slots) *
+ master->ibi.num_slots,
+ GFP_KERNEL);
+ if (!master->ibi.slots)
+ goto err_disable_sysclk;
+
+ writel(MST_INT_IBI_REQ, master->regs + MST_IER);
+
+ 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@...e-electrons.com>");
+MODULE_DESCRIPTION("Cadence I3C master driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:cdns-i3c-master");
--
2.11.0
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