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Message-Id: <1532120272-17157-2-git-send-email-soares@synopsys.com>
Date: Fri, 20 Jul 2018 21:57:50 +0100
From: Vitor soares <Vitor.Soares@...opsys.com>
To: boris.brezillon@...tlin.com, wsa@...-dreams.de,
linux-i2c@...r.kernel.org, corbet@....net,
linux-doc@...r.kernel.org, gregkh@...uxfoundation.org,
arnd@...db.de
Cc: psroka@...ence.com, agolec@...ence.com, adouglas@...ence.com,
bfolta@...ence.com, dkos@...ence.com, alicja@...ence.com,
cwronka@...ence.com, sureshp@...ence.com, rafalc@...ence.com,
thomas.petazzoni@...tlin.com, nm@...com, robh+dt@...nel.org,
pawel.moll@....com, mark.rutland@....com,
ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
geert@...ux-m68k.org, linus.walleij@...aro.org,
Xiang.Lin@...aptics.com, linux-gpio@...r.kernel.org,
nsekhar@...com, pgaj@...ence.com, peda@...ntia.se,
Joao.Pinto@...opsys.com, Vitor.Soares@...opsys.com
Subject: [PATCH 1/3] i3c: master: Add driver for Synopsys DesignWare IP
This patch add driver for Synopsys DesignWare IP on top of
I3C subsystem patchset proposal V6
Signed-off-by: Vitor soares <soares@...opsys.com>
---
drivers/i3c/master/Kconfig | 10 +
drivers/i3c/master/Makefile | 1 +
drivers/i3c/master/dw-i3c-master.c | 1255 ++++++++++++++++++++++++++++++++++++
3 files changed, 1266 insertions(+)
create mode 100644 drivers/i3c/master/dw-i3c-master.c
diff --git a/drivers/i3c/master/Kconfig b/drivers/i3c/master/Kconfig
index 56b9a18..87d6a8c 100644
--- a/drivers/i3c/master/Kconfig
+++ b/drivers/i3c/master/Kconfig
@@ -3,3 +3,13 @@ config CDNS_I3C_MASTER
depends on I3C
help
Enable this driver if you want to support Cadence I3C master block.
+
+config DW_I3C_MASTER
+ tristate "Synospsys DesignWare I3C master driver"
+ depends on I3C
+ help
+ If you say yes to this option, support will be included for the
+ Synopsys DesignWare I3C controller. Only master mode is supported.
+
+ This driver can also be built as a module. If so, the module
+ will be called dw-i3c-master.
diff --git a/drivers/i3c/master/Makefile b/drivers/i3c/master/Makefile
index 4c4304a..fc53939 100644
--- a/drivers/i3c/master/Makefile
+++ b/drivers/i3c/master/Makefile
@@ -1 +1,2 @@
obj-$(CONFIG_CDNS_I3C_MASTER) += i3c-master-cdns.o
+obj-$(CONFIG_DW_I3C_MASTER) += dw-i3c-master.o
diff --git a/drivers/i3c/master/dw-i3c-master.c b/drivers/i3c/master/dw-i3c-master.c
new file mode 100644
index 0000000..cb2a22b
--- /dev/null
+++ b/drivers/i3c/master/dw-i3c-master.c
@@ -0,0 +1,1255 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018 Synopsys, Inc. and/or its affiliates.
+ *
+ * Author: Vitor Soares <soares@...opsys.com>
+ */
+
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/completion.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/i3c/master.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+
+#define DEVICE_CTRL 0x0
+#define DEV_CTRL_ENABLE BIT(31)
+#define DEV_CTRL_RESUME BIT(30)
+#define DEV_CTRL_HOT_JOIN BIT(8)
+#define DEV_CTRL_I2C_SLAVE_PRESENT BIT(7)
+
+#define DEVICE_ADDR 0x4
+#define DEV_ADDR_DYNAMIC_ADDR_VALID BIT(31)
+#define DEV_ADDR_DYNAMIC(x) (((x) << 16) & GENMASK(22, 16))
+
+#define HW_CAPABILITY 0x8
+#define COMMAND_QUEUE_PORT 0xc
+
+#define COMMAND_PORT_ARG_DATA_LEN(x) (((x) << 16) & GENMASK(31, 16))
+#define COMMAND_PORT_ARG_DATA_LEN_MAX 65536
+
+#define COMMAND_PORT_TOC BIT(30)
+#define COMMAND_PORT_READ_TRANSFER BIT(28)
+#define COMMAND_PORT_SDAP BIT(27)
+#define COMMAND_PORT_ROC BIT(26)
+#define COMMAND_PORT_SPEED(x) (((x) << 21) & GENMASK(23, 21))
+#define COMMAND_PORT_DEV_COUNT(x) (((x) << 21) & GENMASK(25, 21))
+#define COMMAND_PORT_DEV_INDEX(x) (((x) << 16) & GENMASK(20, 16))
+#define COMMAND_PORT_CP BIT(15)
+#define COMMAND_PORT_CMD(x) (((x) << 7) & GENMASK(14, 7))
+#define COMMAND_PORT_TID(x) (((x) << 3) & GENMASK(6, 3))
+
+#define COMMAND_PORT_ADDR_ASSGN_CMD 0x03
+#define COMMAND_PORT_SHORT_DATA_ARG 0x02
+#define COMMAND_PORT_TRANSFER_ARG 0x01
+
+#define COMMAND_PORT_SDA_DATA_BYTE_3(x) (((x) << 24) & GENMASK(31, 24))
+#define COMMAND_PORT_SDA_DATA_BYTE_2(x) (((x) << 16) & GENMASK(23, 16))
+#define COMMAND_PORT_SDA_DATA_BYTE_1(x) (((x) << 8) & GENMASK(15, 8))
+#define COMMAND_PORT_SDA_BYTE_STRB_3 BIT(5)
+#define COMMAND_PORT_SDA_BYTE_STRB_2 BIT(4)
+#define COMMAND_PORT_SDA_BYTE_STRB_1 BIT(3)
+
+#define RESPONSE_QUEUE_PORT 0x10
+#define RESPONSE_PORT_ERR_STATUS(x) (((x) & GENMASK(31, 28)) >> 28)
+#define RESPONSE_NO_ERROR 0
+#define RESPONSE_ERROR_CRC 1
+#define RESPONSE_ERROR_PARITY 2
+#define RESPONSE_ERROR_FRAME 3
+#define RESPONSE_ERROR_IBA_NACK 4
+#define RESPONSE_ERROR_ADDRESS_NACK 5
+#define RESPONSE_ERROR_OVER_UNDER_FLOW 6
+#define RESPONSE_ERROR_TRANSF_ABORT 8
+#define RESPONSE_ERROR_I2C_W_NACK_ERR 9
+#define RESPONSE_PORT_TID(x) (((x) & GENMASK(27, 24)) >> 24)
+#define RESPONSE_PORT_DATA_LEN(x) ((x) & GENMASK(15, 0))
+
+#define RX_TX_DATA_PORT 0x14
+#define IBI_QUEUE_DATA 0x18
+#define IBI_QUEUE_STATUS 0x18
+#define QUEUE_THLD_CTRL 0x1c
+#define QUEUE_THLD_CTRL_RESP_BUF(x) ((x) << 8)
+#define QUEUE_THLD_CTRL_RESP_BUF_MASK GENMASK(15, 8)
+
+#define DATA_BUFFER_THLD_CTRL 0x20
+#define DATA_BUFFER_THLD_CTRL_RX_BUF GENMASK(11, 8)
+
+#define IBI_QUEUE_CTRL 0x24
+#define IBI_SIR_REQ_REJECT 0x30
+#define RESET_CTRL 0x34
+#define RESET_CTRL_IBI_QUEUE BIT(5)
+#define RESET_CTRL_RX_FIFO BIT(4)
+#define RESET_CTRL_TX_FIFO BIT(3)
+#define RESET_CTRL_RESP_QUEUE BIT(2)
+#define RESET_CTRL_CMD_QUEUE BIT(1)
+#define RESET_CTRL_SOFT BIT(0)
+
+#define SLV_EVENT_CTRL 0x38
+
+#define INTR_STATUS 0x3c
+#define INTR_STATUS_EN 0x40
+#define INTR_SIGNAL_EN 0x44
+#define INTR_FORCE 0x48
+#define INTR_IBI_UPDATED_STAT BIT(12)
+#define INTR_READ_REQ_RECV_STAT BIT(11)
+#define INTR_TRANSFER_ERR_STAT BIT(9)
+#define INTR_DYN_ADDR_ASSGN_STAT BIT(8)
+#define INTR_CCC_UPDATED_STAT BIT(6)
+#define INTR_TRANSFER_ABORT_STAT BIT(5)
+#define INTR_RESP_READY_STAT BIT(4)
+#define INTR_CMD_QUEUE_READY_STAT BIT(3)
+#define INTR_IBI_THLD_STAT BIT(2)
+#define INTR_RX_THLD_STAT BIT(1)
+#define INTR_TX_THLD_STAT BIT(0)
+#define INTR_ALL (INTR_IBI_UPDATED_STAT | \
+ INTR_READ_REQ_RECV_STAT | \
+ INTR_TRANSFER_ERR_STAT | \
+ INTR_DYN_ADDR_ASSGN_STAT | \
+ INTR_CCC_UPDATED_STAT | \
+ INTR_TRANSFER_ABORT_STAT | \
+ INTR_RESP_READY_STAT | \
+ INTR_CMD_QUEUE_READY_STAT | \
+ INTR_IBI_THLD_STAT | \
+ INTR_TX_THLD_STAT | \
+ INTR_RX_THLD_STAT)
+
+#define QUEUE_STATUS_LEVEL 0x4c
+#define QUEUE_STATUS_LEVEL_RESP(x) (((x) & GENMASK(15, 8)) >> 8)
+#define QUEUE_STATUS_LEVEL_CMD(x) ((x) & GENMASK(7, 0))
+
+#define DATA_BUFFER_STATUS_LEVEL 0x50
+#define DATA_BUFFER_STATUS_LEVEL_TX(x) ((x) & GENMASK(7, 0))
+
+#define PRESENT_STATE 0x54
+#define CCC_DEVICE_STATUS 0x58
+#define DEVICE_ADDR_TABLE_POINTER 0x5c
+#define DEVICE_ADDR_TABLE_DEPTH(x) (((x) & GENMASK(31, 16)) >> 16)
+#define DEVICE_ADDR_TABLE_ADDR(x) ((x) & GENMASK(7, 0))
+
+
+#define DEV_CHAR_TABLE_POINTER 0x60
+#define VENDOR_SPECIFIC_REG_POINTER 0x6c
+#define SLV_PID_VALUE 0x74
+#define SLV_CHAR_CTRL 0x78
+#define SLV_MAX_LEN 0x7c
+#define MAX_READ_TURNAROUND 0x80
+#define MAX_DATA_SPEED 0x84
+#define SLV_DEBUG_STATUS 0x88
+#define SLV_INTR_REQ 0x8c
+#define DEVICE_CTRL_EXTENDED 0xb0
+#define SCL_I3C_OD_TIMING 0xb4
+#define SCL_I3C_PP_TIMING 0xb8
+#define SCL_I3C_TIMING_LCNT(x) ((x) & GENMASK(7, 0))
+#define SCL_I3C_TIMING_HCNT(x) (((x) << 16) & GENMASK(23, 16))
+#define SCL_I3C_TIMING_CNT_MIN 5
+
+#define SCL_I2C_FM_TIMING 0xbc
+#define SCL_I2C_FM_TIMING_LCNT(x) ((x) & GENMASK(15, 0))
+#define SCL_I2C_FM_TIMING_HCNT(x) (((x) << 16) & GENMASK(31, 16))
+
+#define SCL_I2C_FMP_TIMING 0xc0
+#define SCL_I2C_FMP_TIMING_LCNT(x) ((x) & GENMASK(15, 0))
+#define SCL_I2C_FMP_TIMING_HCNT(x) (((x) << 16) & GENMASK(23, 16))
+
+#define SCL_EXT_LCNT_TIMING 0xc8
+#define SCL_EXT_LCNT_1(x) ((x) & GENMASK(7, 0))
+#define SCL_EXT_LCNT_2(x) (((x) << 8) & GENMASK(15, 8))
+#define SCL_EXT_LCNT_3(x) (((x) << 16) & GENMASK(23, 16))
+#define SCL_EXT_LCNT_4(x) (((x) << 24) & GENMASK(31, 24))
+
+#define SCL_EXT_TERMN_LCNT_TIMING 0xcc
+#define BUS_FREE_TIMING 0xd4
+#define BUS_I3C_MST_FREE(x) ((x) & GENMASK(15, 0))
+
+#define BUS_IDLE_TIMING 0xd8
+#define I3C_VER_ID 0xe0
+#define I3C_VER_TYPE 0xe4
+#define EXTENDED_CAPABILITY 0xe8
+#define SLAVE_CONFIG 0xec
+
+#define MR_SEL_MASTER_REQUEST BIT(1)
+#define IBI_SIR_REQ_REJECT_ALL GENMASK(31, 0)
+#define MR_REQ_REJECT_NACK BIT(1)
+
+#define DEV_ADDR_TABLE_LEGACY_I2C_DEV BIT(31)
+#define DEV_ADDR_TABLE_STATIC_ADDR(x) ((x) & GENMASK(6, 0))
+#define DEV_ADDR_TABLE_DYNAMIC_ADDR(x) (((x) << 16) & GENMASK(23, 16))
+#define DEV_ADDR_TABLE_LOC(start, idx) ((start) + ((idx) << 2))
+
+#define MAX_DEVS 32
+
+#define I3C_BUS_SDR1_SCL_RATE 8000000
+#define I3C_BUS_SDR2_SCL_RATE 6000000
+#define I3C_BUS_SDR3_SCL_RATE 4000000
+#define I3C_BUS_SDR4_SCL_RATE 2000000
+#define I3C_BUS_THIGH_MAX_NS 41
+#define I3C_BUS_I2C_FMP_TLOW_MIN_NS 500
+#define I3C_BUS_I2C_FM_TLOW_MIN_NS 1300
+
+#define XFER_TIMEOUT (msecs_to_jiffies(1000))
+
+struct dw_i3c_master_caps {
+ u8 cmdfifodepth;
+ u8 datafifodepth;
+};
+
+struct dw_i3c_cmd {
+ u32 cmd_lo;
+ u32 cmd_hi;
+ u16 tx_len;
+ const void *tx_buf;
+ u16 rx_len;
+ void *rx_buf;
+ u8 error;
+};
+
+struct dw_i3c_xfer {
+ struct list_head node;
+ struct completion comp;
+ int ret;
+ unsigned int ncmds;
+ struct dw_i3c_cmd cmds[0];
+};
+
+struct dw_i3c_master {
+ struct i3c_master_controller base;
+ u16 maxdevs;
+ u16 datstartaddr;
+ u32 free_pos;
+ struct {
+ struct list_head list;
+ struct dw_i3c_xfer *cur;
+ spinlock_t lock;
+ } xferqueue;
+ struct dw_i3c_master_caps caps;
+ void __iomem *regs;
+ struct reset_control *core_rst;
+ struct clk *core_clk;
+ char version[5];
+ char type[5];
+ u8 addrs[MAX_DEVS];
+};
+
+struct dw_i3c_i2c_dev_data {
+ u8 index;
+};
+
+static bool dw_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_GETMXDS:
+ case I3C_CCC_GETHDRCAP:
+ return true;
+ default:
+ break;
+ }
+
+ return false;
+}
+
+static inline struct dw_i3c_master *
+to_dw_i3c_master(struct i3c_master_controller *master)
+{
+ return container_of(master, struct dw_i3c_master, base);
+}
+
+static void dw_i3c_master_disable(struct dw_i3c_master *master)
+{
+ writel(readl(master->regs + DEVICE_CTRL) & DEV_CTRL_ENABLE,
+ master->regs + DEVICE_CTRL);
+}
+
+static void dw_i3c_master_enable(struct dw_i3c_master *master)
+{
+ writel(readl(master->regs + DEVICE_CTRL) | DEV_CTRL_ENABLE,
+ master->regs + DEVICE_CTRL);
+}
+
+static int dw_i3c_master_get_addr_pos(struct dw_i3c_master *master, u8 addr)
+{
+ int pos;
+
+ for (pos = 0; pos < master->maxdevs; pos++) {
+ if (addr == master->addrs[pos])
+ return pos;
+ }
+
+ return -EINVAL;
+}
+
+static int dw_i3c_master_get_free_pos(struct dw_i3c_master *master)
+{
+ if (!(master->free_pos & GENMASK(master->maxdevs - 1, 0)))
+ return -ENOSPC;
+
+ return ffs(master->free_pos) - 1;
+}
+
+static void dw_i3c_master_wr_tx_fifo(struct dw_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 + RX_TX_DATA_PORT);
+ }
+}
+
+static void dw_i3c_master_read_rx_fifo(struct dw_i3c_master *master,
+ u8 *bytes, int nbytes)
+{
+ int i, j;
+
+ for (i = 0; i < nbytes; i += 4) {
+ u32 data;
+
+ data = readl(master->regs + RX_TX_DATA_PORT);
+
+ for (j = 0; j < 4 && (i + j) < nbytes; j++)
+ bytes[i + j] = data >> (j * 8);
+ }
+}
+
+static struct dw_i3c_xfer *
+dw_i3c_master_alloc_xfer(struct dw_i3c_master *master, unsigned int ncmds)
+{
+ struct dw_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 dw_i3c_master_free_xfer(struct dw_i3c_xfer *xfer)
+{
+ kfree(xfer);
+}
+
+static void dw_i3c_master_start_xfer_locked(struct dw_i3c_master *master)
+{
+ struct dw_i3c_xfer *xfer = master->xferqueue.cur;
+ unsigned int i;
+ u32 r;
+
+ if (!xfer)
+ return;
+
+ for (i = 0; i < xfer->ncmds; i++) {
+ struct dw_i3c_cmd *cmd = &xfer->cmds[i];
+
+ dw_i3c_master_wr_tx_fifo(master, cmd->tx_buf, cmd->tx_len);
+ }
+
+ r = readl(master->regs + QUEUE_THLD_CTRL);
+ r &= ~QUEUE_THLD_CTRL_RESP_BUF_MASK;
+ r |= QUEUE_THLD_CTRL_RESP_BUF(xfer->ncmds - 1);
+ writel(r, master->regs + QUEUE_THLD_CTRL);
+
+ for (i = 0; i < xfer->ncmds; i++) {
+ struct dw_i3c_cmd *cmd = &xfer->cmds[i];
+
+ writel(cmd->cmd_hi, master->regs + COMMAND_QUEUE_PORT);
+ writel(cmd->cmd_lo, master->regs + COMMAND_QUEUE_PORT);
+ }
+}
+
+static void dw_i3c_master_enqueue_xfer(struct dw_i3c_master *master,
+ struct dw_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;
+ dw_i3c_master_start_xfer_locked(master);
+ }
+ spin_unlock_irqrestore(&master->xferqueue.lock, flags);
+}
+
+static void dw_i3c_master_dequeue_xfer(struct dw_i3c_master *master,
+ struct dw_i3c_xfer *xfer)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&master->xferqueue.lock, flags);
+ if (master->xferqueue.cur == xfer) {
+ u32 status;
+
+ master->xferqueue.cur = NULL;
+
+ writel(RESET_CTRL_RX_FIFO | RESET_CTRL_TX_FIFO |
+ RESET_CTRL_RESP_QUEUE | RESET_CTRL_CMD_QUEUE,
+ master->regs + RESET_CTRL);
+
+ readl_poll_timeout_atomic(master->regs + RESET_CTRL, status,
+ !status, 10, 1000000);
+ } else {
+ list_del_init(&xfer->node);
+ }
+ spin_unlock_irqrestore(&master->xferqueue.lock, flags);
+}
+
+static void dw_i3c_master_end_xfer_locked(struct dw_i3c_master *master, u32 isr)
+{
+ struct dw_i3c_xfer *xfer = master->xferqueue.cur;
+ int i, ret = 0;
+ u32 nresp;
+
+ if (!xfer)
+ return;
+
+ nresp = readl(master->regs + QUEUE_STATUS_LEVEL);
+ nresp = QUEUE_STATUS_LEVEL_RESP(nresp);
+
+ for (i = 0; i < nresp; i++) {
+ struct dw_i3c_cmd *cmd;
+ u32 resp;
+
+ resp = readl(master->regs + RESPONSE_QUEUE_PORT);
+
+ cmd = &xfer->cmds[RESPONSE_PORT_TID(resp)];
+ cmd->rx_len = RESPONSE_PORT_DATA_LEN(resp);
+ cmd->error = RESPONSE_PORT_ERR_STATUS(resp);
+ if (cmd->rx_len && !cmd->error)
+ dw_i3c_master_read_rx_fifo(master, cmd->rx_buf,
+ cmd->rx_len);
+ }
+
+ for (i = 0; i < nresp; i++) {
+ switch (xfer->cmds[i].error) {
+ case RESPONSE_NO_ERROR:
+ break;
+ case RESPONSE_ERROR_PARITY:
+ case RESPONSE_ERROR_IBA_NACK:
+ case RESPONSE_ERROR_TRANSF_ABORT:
+ case RESPONSE_ERROR_CRC:
+ case RESPONSE_ERROR_FRAME:
+ ret = -EIO;
+ break;
+ case RESPONSE_ERROR_OVER_UNDER_FLOW:
+ ret = -ENOSPC;
+ break;
+ case RESPONSE_ERROR_I2C_W_NACK_ERR:
+ case RESPONSE_ERROR_ADDRESS_NACK:
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ }
+
+ xfer->ret = ret;
+ complete(&xfer->comp);
+
+ if (ret < 0) {
+ dw_i3c_master_dequeue_xfer(master, xfer);
+ writel(readl(master->regs + DEVICE_CTRL) | DEV_CTRL_RESUME,
+ master->regs + DEVICE_CTRL);
+ }
+
+ xfer = list_first_entry_or_null(&master->xferqueue.list,
+ struct dw_i3c_xfer,
+ node);
+ if (xfer)
+ list_del_init(&xfer->node);
+
+ master->xferqueue.cur = xfer;
+ dw_i3c_master_start_xfer_locked(master);
+}
+
+static void dw_i3c_master_dev_set_info(struct dw_i3c_master *master,
+ struct i3c_device_info *info)
+{
+ u32 r;
+
+ memset(info, 0, sizeof(*info));
+
+ r = readl(master->regs + DEVICE_ADDR);
+ info->dyn_addr = (r >> 16) & I3C_MAX_ADDR;
+
+ r = readl(master->regs + SLV_CHAR_CTRL);
+ info->dcr = r;
+ info->bcr = r >> 8;
+ info->hdr_cap = r >> 16;
+ info->pid = (u64)readl(master->regs + SLV_PID_VALUE);
+}
+
+static int dw_i3c_clk_cfg(struct dw_i3c_master *master)
+{
+ unsigned long core_rate, core_period;
+ u8 hcnt, lcnt;
+ u32 r;
+
+
+ core_rate = clk_get_rate(master->core_clk);
+ if (!core_rate)
+ return -EINVAL;
+
+ core_period = DIV_ROUND_UP(1000000000, core_rate);
+
+ hcnt = DIV_ROUND_UP(I3C_BUS_THIGH_MAX_NS, core_period) - 1;
+ if (hcnt < SCL_I3C_TIMING_CNT_MIN)
+ hcnt = SCL_I3C_TIMING_CNT_MIN;
+
+ lcnt = DIV_ROUND_UP(core_rate, I3C_BUS_TYP_I3C_SCL_RATE) - hcnt;
+ if (lcnt < SCL_I3C_TIMING_CNT_MIN)
+ lcnt = SCL_I3C_TIMING_CNT_MIN;
+
+ r = SCL_I3C_TIMING_HCNT(hcnt) | SCL_I3C_TIMING_LCNT(lcnt);
+ writel(r, master->regs + SCL_I3C_PP_TIMING);
+
+ if (!(readl(master->regs + DEVICE_CTRL) & DEV_CTRL_I2C_SLAVE_PRESENT))
+ writel(BUS_I3C_MST_FREE(lcnt), master->regs + BUS_FREE_TIMING);
+
+ lcnt = DIV_ROUND_UP(I3C_BUS_TLOW_OD_MIN_NS, core_period);
+ r = SCL_I3C_TIMING_HCNT(hcnt) | SCL_I3C_TIMING_LCNT(lcnt);
+ writel(r, master->regs + SCL_I3C_OD_TIMING);
+
+ lcnt = DIV_ROUND_UP(core_rate, I3C_BUS_SDR1_SCL_RATE) - hcnt;
+ r = SCL_EXT_LCNT_1(lcnt);
+ lcnt = DIV_ROUND_UP(core_rate, I3C_BUS_SDR2_SCL_RATE) - hcnt;
+ r |= SCL_EXT_LCNT_2(lcnt);
+ lcnt = DIV_ROUND_UP(core_rate, I3C_BUS_SDR3_SCL_RATE) - hcnt;
+ r |= SCL_EXT_LCNT_3(lcnt);
+ lcnt = DIV_ROUND_UP(core_rate, I3C_BUS_SDR4_SCL_RATE) - hcnt;
+ r |= SCL_EXT_LCNT_4(lcnt);
+ writel(r, master->regs + SCL_EXT_LCNT_TIMING);
+
+ return 0;
+}
+
+static int dw_i2c_clk_cfg(struct dw_i3c_master *master)
+{
+ unsigned long core_rate, core_period;
+ u16 hcnt, lcnt;
+ u32 r;
+
+ core_rate = clk_get_rate(master->core_clk);
+ if (!core_rate)
+ return -EINVAL;
+
+ core_period = DIV_ROUND_UP(1000000000, core_rate);
+
+ lcnt = DIV_ROUND_UP(I3C_BUS_I2C_FMP_TLOW_MIN_NS, core_period);
+ hcnt = DIV_ROUND_UP(core_rate, I3C_BUS_I2C_FM_PLUS_SCL_RATE) - lcnt;
+ r = SCL_I2C_FMP_TIMING_HCNT(hcnt) | SCL_I2C_FMP_TIMING_LCNT(lcnt);
+ writel(r, master->regs + SCL_I2C_FMP_TIMING);
+
+ lcnt = DIV_ROUND_UP(I3C_BUS_I2C_FM_TLOW_MIN_NS, core_period);
+ hcnt = DIV_ROUND_UP(core_rate, I3C_BUS_I2C_FM_SCL_RATE) - lcnt;
+ r = SCL_I2C_FM_TIMING_HCNT(hcnt) | SCL_I2C_FM_TIMING_LCNT(lcnt);
+ writel(r, master->regs + SCL_I2C_FM_TIMING);
+ writel(BUS_I3C_MST_FREE(lcnt), master->regs + BUS_FREE_TIMING);
+
+ return 0;
+}
+
+static int dw_i3c_master_bus_init(struct i3c_master_controller *m)
+{
+ struct dw_i3c_master *master = to_dw_i3c_master(m);
+ struct i3c_device_info info = { };
+ u32 r;
+ int ret;
+
+ switch (m->bus->mode) {
+ case I3C_BUS_MODE_MIXED_FAST:
+ r = readl(master->regs + DEVICE_CTRL);
+ r |= DEV_CTRL_I2C_SLAVE_PRESENT;
+ writel(r, master->regs + DEVICE_CTRL);
+ ret = dw_i2c_clk_cfg(master);
+ if (ret)
+ return ret;
+ case I3C_BUS_MODE_PURE:
+ ret = dw_i3c_clk_cfg(master);
+ if (ret)
+ return ret;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ ret = readl(master->regs + QUEUE_THLD_CTRL);
+ ret &= ~QUEUE_THLD_CTRL_RESP_BUF_MASK;
+ writel(ret, master->regs + QUEUE_THLD_CTRL);
+
+ ret = readl(master->regs + DATA_BUFFER_THLD_CTRL);
+ ret &= ~DATA_BUFFER_THLD_CTRL_RX_BUF;
+ writel(ret, master->regs + DATA_BUFFER_THLD_CTRL);
+
+ writel(INTR_ALL, master->regs + INTR_STATUS);
+ r = INTR_RESP_READY_STAT | INTR_TRANSFER_ERR_STAT;
+ writel(r, master->regs + INTR_STATUS_EN);
+ writel(r, master->regs + INTR_SIGNAL_EN);
+
+ r = i3c_master_get_free_addr(m, 0);
+ if (r < 0)
+ return r;
+
+ r = DEV_ADDR_DYNAMIC_ADDR_VALID | DEV_ADDR_DYNAMIC(r);
+ writel(r, master->regs + DEVICE_ADDR);
+
+ dw_i3c_master_dev_set_info(master, &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;
+
+ writel(IBI_SIR_REQ_REJECT_ALL, master->regs + IBI_SIR_REQ_REJECT);
+
+ r = readl(master->regs + DEVICE_CTRL);
+ r |= DEV_CTRL_HOT_JOIN;
+ writel(r, master->regs + DEVICE_CTRL);
+
+ dw_i3c_master_enable(master);
+
+ return 0;
+}
+
+static void dw_i3c_master_bus_cleanup(struct i3c_master_controller *m)
+{
+ struct dw_i3c_master *master = to_dw_i3c_master(m);
+
+ dw_i3c_master_disable(master);
+}
+
+
+static int dw_i3c_ccc_set(struct dw_i3c_master *master,
+ struct i3c_ccc_cmd *ccc)
+{
+ struct dw_i3c_xfer *xfer;
+ struct dw_i3c_cmd *cmd;
+ int ret, pos = 0;
+
+ if (ccc->id & I3C_CCC_DIRECT) {
+ pos = dw_i3c_master_get_addr_pos(master, ccc->dests[0].addr);
+ if (pos < 0)
+ return pos;
+ }
+
+ xfer = dw_i3c_master_alloc_xfer(master, 1);
+ if (!xfer)
+ return -ENOMEM;
+
+ cmd = xfer->cmds;
+ cmd->tx_buf = ccc->dests[0].payload.data;
+ cmd->tx_len = ccc->dests[0].payload.len;
+
+ cmd->cmd_hi = COMMAND_PORT_ARG_DATA_LEN(ccc->dests[0].payload.len) |
+ COMMAND_PORT_TRANSFER_ARG;
+
+ cmd->cmd_lo = COMMAND_PORT_CP |
+ COMMAND_PORT_DEV_INDEX(pos) |
+ COMMAND_PORT_CMD(ccc->id) |
+ COMMAND_PORT_TOC |
+ COMMAND_PORT_ROC;
+
+ dw_i3c_master_enqueue_xfer(master, xfer);
+ if (!wait_for_completion_timeout(&xfer->comp, XFER_TIMEOUT))
+ dw_i3c_master_dequeue_xfer(master, xfer);
+
+ ret = xfer->ret;
+ if (xfer->cmds[0].error == RESPONSE_ERROR_IBA_NACK)
+ ccc->err = I3C_ERROR_M2;
+
+ dw_i3c_master_free_xfer(xfer);
+
+ return ret;
+}
+
+static int dw_i3c_ccc_get(struct dw_i3c_master *master, struct i3c_ccc_cmd *ccc)
+{
+ struct dw_i3c_xfer *xfer;
+ struct dw_i3c_cmd *cmd;
+ int ret, pos;
+
+ pos = dw_i3c_master_get_addr_pos(master, ccc->dests[0].addr);
+ if (pos < 0)
+ return pos;
+
+ xfer = dw_i3c_master_alloc_xfer(master, 1);
+ if (!xfer)
+ return -ENOMEM;
+
+ cmd = xfer->cmds;
+ cmd->rx_buf = ccc->dests[0].payload.data;
+ cmd->rx_len = ccc->dests[0].payload.len;
+
+ cmd->cmd_hi = COMMAND_PORT_ARG_DATA_LEN(ccc->dests[0].payload.len) |
+ COMMAND_PORT_TRANSFER_ARG;
+
+ cmd->cmd_lo = COMMAND_PORT_READ_TRANSFER |
+ COMMAND_PORT_CP |
+ COMMAND_PORT_DEV_INDEX(pos) |
+ COMMAND_PORT_CMD(ccc->id) |
+ COMMAND_PORT_TOC |
+ COMMAND_PORT_ROC;
+
+ dw_i3c_master_enqueue_xfer(master, xfer);
+ if (!wait_for_completion_timeout(&xfer->comp, XFER_TIMEOUT))
+ dw_i3c_master_dequeue_xfer(master, xfer);
+
+ ret = xfer->ret;
+ if (xfer->cmds[0].error == RESPONSE_ERROR_IBA_NACK)
+ ccc->err = I3C_ERROR_M2;
+ dw_i3c_master_free_xfer(xfer);
+
+ return ret;
+}
+
+static int dw_i3c_master_send_ccc_cmd(struct i3c_master_controller *m,
+ struct i3c_ccc_cmd *ccc)
+{
+ struct dw_i3c_master *master = to_dw_i3c_master(m);
+ int ret = 0;
+
+ if (ccc->id == I3C_CCC_ENTDAA)
+ return -EINVAL;
+
+ if (ccc->rnw)
+ ret = dw_i3c_ccc_get(master, ccc);
+ else
+ ret = dw_i3c_ccc_set(master, ccc);
+
+ return ret;
+}
+
+static int dw_i3c_master_daa(struct i3c_master_controller *m)
+{
+ struct dw_i3c_master *master = to_dw_i3c_master(m);
+ struct dw_i3c_xfer *xfer;
+ struct dw_i3c_cmd *cmd;
+ u32 olddevs, newdevs;
+ u8 p, last_addr = 0;
+ int ret, pos;
+
+ /* For now we don't support HJ */
+ if (m->init_done)
+ return -EPERM;
+
+ olddevs = ~(master->free_pos);
+
+ /* Prepare DAT before launching DAA. */
+ for (pos = 0; pos < master->maxdevs; pos++) {
+ if (olddevs & BIT(pos))
+ continue;
+
+ ret = i3c_master_get_free_addr(m, last_addr + 1);
+ if (ret < 0)
+ return -ENOSPC;
+ master->addrs[pos] = ret;
+ p = (ret >> 6) ^ (ret >> 5) ^ (ret >> 4) ^ (ret >> 3) ^
+ (ret >> 2) ^ (ret >> 1) ^ ret ^ 1;
+ p = p & 1;
+ last_addr = ret;
+ ret |= (p << 7);
+
+ writel(DEV_ADDR_TABLE_DYNAMIC_ADDR(ret),
+ master->regs +
+ DEV_ADDR_TABLE_LOC(master->datstartaddr, pos));
+ }
+
+ xfer = dw_i3c_master_alloc_xfer(master, 1);
+ if (!xfer)
+ return -ENOMEM;
+
+ pos = dw_i3c_master_get_free_pos(master);
+ cmd = &xfer->cmds[0];
+ cmd->cmd_hi = 0x1;
+ cmd->cmd_lo = COMMAND_PORT_DEV_COUNT(master->maxdevs - pos) |
+ COMMAND_PORT_DEV_INDEX(pos) |
+ COMMAND_PORT_CMD(I3C_CCC_ENTDAA) |
+ COMMAND_PORT_ADDR_ASSGN_CMD |
+ COMMAND_PORT_TOC |
+ COMMAND_PORT_ROC;
+
+ dw_i3c_master_enqueue_xfer(master, xfer);
+ if (!wait_for_completion_timeout(&xfer->comp, XFER_TIMEOUT))
+ dw_i3c_master_dequeue_xfer(master, xfer);
+
+ newdevs = GENMASK(master->maxdevs - cmd->rx_len - 1, 0);
+ newdevs &= ~olddevs;
+
+ for (pos = 0; pos < master->maxdevs; pos++) {
+ if (newdevs & BIT(pos))
+ i3c_master_add_i3c_dev_locked(m, master->addrs[pos]);
+ }
+
+ dw_i3c_master_free_xfer(xfer);
+
+ i3c_master_disec_locked(m, I3C_BROADCAST_ADDR,
+ I3C_CCC_EVENT_HJ |
+ I3C_CCC_EVENT_MR |
+ I3C_CCC_EVENT_SIR);
+
+ return 0;
+}
+
+static int dw_i3c_master_priv_xfers(struct i3c_dev_desc *dev,
+ struct i3c_priv_xfer *i3c_xfers,
+ int i3c_nxfers)
+{
+ struct dw_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev);
+ struct i3c_master_controller *m = i3c_dev_get_master(dev);
+ struct dw_i3c_master *master = to_dw_i3c_master(m);
+ unsigned int nrxwords = 0, ntxwords = 0;
+ struct dw_i3c_xfer *xfer;
+ int i, ret = 0;
+
+ if (!i3c_nxfers)
+ return 0;
+
+ if (i3c_nxfers > master->caps.cmdfifodepth)
+ return -ENOTSUPP;
+
+ for (i = 0; i < i3c_nxfers; i++) {
+ if (i3c_xfers[i].len > COMMAND_PORT_ARG_DATA_LEN_MAX)
+ return -ENOTSUPP;
+ }
+
+ for (i = 0; i < i3c_nxfers; i++) {
+ if (i3c_xfers[i].rnw)
+ nrxwords += DIV_ROUND_UP(i3c_xfers[i].len, 4);
+ else
+ ntxwords += DIV_ROUND_UP(i3c_xfers[i].len, 4);
+ }
+
+ if (ntxwords > master->caps.datafifodepth ||
+ nrxwords > master->caps.datafifodepth)
+ return -ENOTSUPP;
+
+ xfer = dw_i3c_master_alloc_xfer(master, i3c_nxfers);
+ if (!xfer)
+ return -ENOMEM;
+
+ for (i = 0; i < i3c_nxfers; i++) {
+ struct dw_i3c_cmd *cmd = &xfer->cmds[i];
+
+ cmd->cmd_hi = COMMAND_PORT_ARG_DATA_LEN(i3c_xfers[i].len) |
+ COMMAND_PORT_TRANSFER_ARG;
+
+ if (i3c_xfers[i].rnw) {
+ cmd->rx_buf = i3c_xfers[i].data.in;
+ cmd->rx_len = i3c_xfers[i].len;
+ cmd->cmd_lo = COMMAND_PORT_READ_TRANSFER |
+ COMMAND_PORT_SPEED(dev->info.max_read_ds);
+
+ } else {
+ cmd->tx_buf = i3c_xfers[i].data.out;
+ cmd->tx_len = i3c_xfers[i].len;
+ cmd->cmd_lo =
+ COMMAND_PORT_SPEED(dev->info.max_write_ds);
+ }
+
+ cmd->cmd_lo |= COMMAND_PORT_TID(i) |
+ COMMAND_PORT_DEV_INDEX(data->index) |
+ COMMAND_PORT_ROC;
+
+ if (i == (i3c_nxfers - 1))
+ cmd->cmd_lo |= COMMAND_PORT_TOC;
+ }
+
+ dw_i3c_master_enqueue_xfer(master, xfer);
+ if (!wait_for_completion_timeout(&xfer->comp, XFER_TIMEOUT))
+ dw_i3c_master_dequeue_xfer(master, xfer);
+
+ ret = xfer->ret;
+ dw_i3c_master_free_xfer(xfer);
+
+ return ret;
+}
+
+static int dw_i3c_master_reattach_i3c_dev(struct i3c_dev_desc *dev,
+ u8 old_dyn_addr)
+{
+ struct dw_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev);
+ struct i3c_master_controller *m = i3c_dev_get_master(dev);
+ struct dw_i3c_master *master = to_dw_i3c_master(m);
+
+ writel(DEV_ADDR_TABLE_DYNAMIC_ADDR(dev->info.dyn_addr),
+ master->regs +
+ DEV_ADDR_TABLE_LOC(master->datstartaddr, data->index));
+
+ if (!old_dyn_addr)
+ return 0;
+
+ master->addrs[data->index] = dev->info.dyn_addr;
+
+ return 0;
+}
+
+static int dw_i3c_master_attach_i3c_dev(struct i3c_dev_desc *dev)
+{
+ struct i3c_master_controller *m = i3c_dev_get_master(dev);
+ struct dw_i3c_master *master = to_dw_i3c_master(m);
+ struct dw_i3c_i2c_dev_data *data;
+ int pos;
+
+ pos = dw_i3c_master_get_free_pos(master);
+ if (pos < 0)
+ return pos;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->index = pos;
+ master->addrs[pos] = dev->info.dyn_addr;
+ master->free_pos &= ~BIT(pos);
+ i3c_dev_set_master_data(dev, data);
+
+ writel(DEV_ADDR_TABLE_DYNAMIC_ADDR(dev->info.dyn_addr),
+ master->regs +
+ DEV_ADDR_TABLE_LOC(master->datstartaddr, data->index));
+
+ return 0;
+}
+
+static void dw_i3c_master_detach_i3c_dev(struct i3c_dev_desc *dev)
+{
+ struct dw_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev);
+ struct i3c_master_controller *m = i3c_dev_get_master(dev);
+ struct dw_i3c_master *master = to_dw_i3c_master(m);
+
+ writel(NULL,
+ master->regs +
+ DEV_ADDR_TABLE_LOC(master->datstartaddr, data->index));
+
+ i3c_dev_set_master_data(dev, NULL);
+ master->addrs[data->index] = 0;
+ master->free_pos |= BIT(data->index);
+ kfree(data);
+}
+
+static int dw_i3c_master_i2c_xfers(struct i2c_dev_desc *dev,
+ const struct i2c_msg *i2c_xfers,
+ int i2c_nxfers)
+{
+ struct dw_i3c_i2c_dev_data *data = i2c_dev_get_master_data(dev);
+ struct i3c_master_controller *m = i2c_dev_get_master(dev);
+ struct dw_i3c_master *master = to_dw_i3c_master(m);
+ unsigned int nrxwords = 0, ntxwords = 0;
+ struct dw_i3c_xfer *xfer;
+ int i, ret = 0;
+
+ if (!i2c_nxfers)
+ return 0;
+
+ if (i2c_nxfers > master->caps.cmdfifodepth)
+ return -ENOTSUPP;
+
+ for (i = 0; i < i2c_nxfers; i++) {
+ if (i2c_xfers[i].len > COMMAND_PORT_ARG_DATA_LEN_MAX)
+ return -ENOTSUPP;
+ }
+
+ for (i = 0; i < i2c_nxfers; i++) {
+ if (i2c_xfers[i].flags & I2C_M_RD)
+ nrxwords += DIV_ROUND_UP(i2c_xfers[i].len, 4);
+ else
+ ntxwords += DIV_ROUND_UP(i2c_xfers[i].len, 4);
+ }
+
+ if (ntxwords > master->caps.datafifodepth ||
+ nrxwords > master->caps.datafifodepth)
+ return -ENOTSUPP;
+
+ xfer = dw_i3c_master_alloc_xfer(master, i2c_nxfers);
+ if (!xfer)
+ return -ENOMEM;
+
+ for (i = 0; i < i2c_nxfers; i++) {
+ struct dw_i3c_cmd *cmd = &xfer->cmds[i];
+
+ cmd->cmd_hi = COMMAND_PORT_ARG_DATA_LEN(i2c_xfers[i].len) |
+ COMMAND_PORT_TRANSFER_ARG;
+
+ cmd->cmd_lo = COMMAND_PORT_TID(i) |
+ COMMAND_PORT_DEV_INDEX(data->index) |
+ COMMAND_PORT_ROC;
+
+ if (i2c_xfers[i].flags & I2C_M_RD) {
+ cmd->cmd_lo |= COMMAND_PORT_READ_TRANSFER;
+ cmd->rx_buf = i2c_xfers[i].buf;
+ cmd->rx_len = i2c_xfers[i].len;
+ } else {
+ cmd->tx_buf = i2c_xfers[i].buf;
+ cmd->tx_len = i2c_xfers[i].len;
+ }
+
+ if (i == (i2c_nxfers - 1))
+ cmd->cmd_lo |= COMMAND_PORT_TOC;
+ }
+
+ dw_i3c_master_enqueue_xfer(master, xfer);
+ if (!wait_for_completion_timeout(&xfer->comp, XFER_TIMEOUT))
+ dw_i3c_master_dequeue_xfer(master, xfer);
+
+ ret = xfer->ret;
+ dw_i3c_master_free_xfer(xfer);
+
+ return ret;
+}
+
+static int dw_i3c_master_attach_i2c_dev(struct i2c_dev_desc *dev)
+{
+ struct i3c_master_controller *m = i2c_dev_get_master(dev);
+ struct dw_i3c_master *master = to_dw_i3c_master(m);
+ struct dw_i3c_i2c_dev_data *data;
+ int pos;
+
+ pos = dw_i3c_master_get_free_pos(master);
+
+ if (pos < 0)
+ return pos;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ master->addrs[pos] = dev->boardinfo->base.addr;
+ data->index = pos;
+ master->free_pos &= ~BIT(pos);
+ i2c_dev_set_master_data(dev, data);
+
+ writel(DEV_ADDR_TABLE_LEGACY_I2C_DEV |
+ DEV_ADDR_TABLE_STATIC_ADDR(dev->boardinfo->base.addr),
+ master->regs +
+ DEV_ADDR_TABLE_LOC(master->datstartaddr, data->index));
+
+ return 0;
+}
+
+static void dw_i3c_master_detach_i2c_dev(struct i2c_dev_desc *dev)
+{
+ struct dw_i3c_i2c_dev_data *data = i2c_dev_get_master_data(dev);
+ struct i3c_master_controller *m = i2c_dev_get_master(dev);
+ struct dw_i3c_master *master = to_dw_i3c_master(m);
+
+ writel(NULL,
+ master->regs +
+ DEV_ADDR_TABLE_LOC(master->datstartaddr, data->index));
+
+ i2c_dev_set_master_data(dev, NULL);
+ master->addrs[data->index] = 0;
+ master->free_pos |= BIT(data->index);
+ kfree(data);
+}
+
+static u32 dw_i3c_master_i2c_funcs(struct i3c_master_controller *m)
+{
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static irqreturn_t dw_i3c_master_irq_handler(int irq, void *dev_id)
+{
+ struct dw_i3c_master *master = dev_id;
+ u32 status;
+
+ status = readl(master->regs + INTR_STATUS);
+
+ if (!(status & readl(master->regs + INTR_STATUS_EN))) {
+ writel(INTR_ALL, master->regs + INTR_STATUS);
+ return IRQ_NONE;
+ }
+
+ spin_lock(&master->xferqueue.lock);
+ dw_i3c_master_end_xfer_locked(master, status);
+ if (status | INTR_TRANSFER_ERR_STAT)
+ writel(INTR_TRANSFER_ERR_STAT, master->regs + INTR_STATUS);
+ spin_unlock(&master->xferqueue.lock);
+
+ return IRQ_HANDLED;
+}
+
+static const struct i3c_master_controller_ops dw_mipi_i3c_ops = {
+ .bus_init = dw_i3c_master_bus_init,
+ .bus_cleanup = dw_i3c_master_bus_cleanup,
+ .attach_i3c_dev = dw_i3c_master_attach_i3c_dev,
+ .reattach_i3c_dev = dw_i3c_master_reattach_i3c_dev,
+ .detach_i3c_dev = dw_i3c_master_detach_i3c_dev,
+ .do_daa = dw_i3c_master_daa,
+ .supports_ccc_cmd = dw_i3c_master_supports_ccc_cmd,
+ .send_ccc_cmd = dw_i3c_master_send_ccc_cmd,
+ .priv_xfers = dw_i3c_master_priv_xfers,
+ .attach_i2c_dev = dw_i3c_master_attach_i2c_dev,
+ .detach_i2c_dev = dw_i3c_master_detach_i2c_dev,
+ .i2c_xfers = dw_i3c_master_i2c_xfers,
+ .i2c_funcs = dw_i3c_master_i2c_funcs,
+};
+
+static int dw_i3c_probe(struct platform_device *pdev)
+{
+ struct dw_i3c_master *master;
+ struct resource *res;
+ int ret, irq;
+
+ 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->core_clk = devm_clk_get(&pdev->dev, "core_clk");
+ if (IS_ERR(master->core_clk))
+ return PTR_ERR(master->core_clk);
+
+ master->core_rst = devm_reset_control_get_optional_exclusive(&pdev->dev,
+ "core_rst");
+ if (IS_ERR(master->core_rst))
+ return PTR_ERR(master->core_rst);
+
+ ret = clk_prepare_enable(master->core_clk);
+ if (ret)
+ goto err_disable_core_clk;
+
+ reset_control_deassert(master->core_rst);
+
+ spin_lock_init(&master->xferqueue.lock);
+ INIT_LIST_HEAD(&master->xferqueue.list);
+
+ writel(INTR_ALL, master->regs + INTR_STATUS);
+ irq = platform_get_irq(pdev, 0);
+ ret = devm_request_irq(&pdev->dev, irq,
+ dw_i3c_master_irq_handler, 0,
+ dev_name(&pdev->dev), master);
+ if (ret)
+ goto err_assert_rst;
+
+ platform_set_drvdata(pdev, master);
+
+ ret = readl(master->regs + QUEUE_STATUS_LEVEL);
+ master->caps.cmdfifodepth = QUEUE_STATUS_LEVEL_CMD(ret);
+
+ ret = readl(master->regs + DATA_BUFFER_STATUS_LEVEL);
+ master->caps.datafifodepth = DATA_BUFFER_STATUS_LEVEL_TX(ret);
+
+ ret = readl(master->regs + DEVICE_ADDR_TABLE_POINTER);
+ master->datstartaddr = ret;
+ master->maxdevs = ret >> 16;
+ master->free_pos = GENMASK(master->maxdevs - 1, 0);
+
+ /* read controller version */
+ ret = readl(master->regs + I3C_VER_ID);
+ master->version[0] = (char)(ret >> 24);
+ master->version[1] = '.';
+ master->version[2] = (char)(ret >> 16);
+ master->version[3] = (char)(ret >> 8);
+ master->version[4] = '\0';
+
+ /* read controller type */
+ ret = readl(master->regs + I3C_VER_TYPE);
+ master->type[0] = (char)(ret >> 24);
+ master->type[1] = (char)(ret >> 16);
+ master->type[2] = (char)(ret >> 8);
+ master->type[3] = (char) ret;
+ master->type[4] = '\0';
+
+ ret = i3c_master_register(&master->base, &pdev->dev,
+ &dw_mipi_i3c_ops, false);
+ if (ret)
+ goto err_assert_rst;
+
+ dev_info(&pdev->dev, "Synopsys DW MIPI I3C Master: version %s-%s\n",
+ master->version, master->type);
+
+ return 0;
+
+err_assert_rst:
+ reset_control_assert(master->core_rst);
+
+err_disable_core_clk:
+ clk_disable_unprepare(master->core_clk);
+
+ return ret;
+}
+
+static int dw_i3c_remove(struct platform_device *pdev)
+{
+ struct dw_i3c_master *master = platform_get_drvdata(pdev);
+ int ret;
+
+ ret = i3c_master_unregister(&master->base);
+ if (ret)
+ return ret;
+
+ reset_control_assert(master->core_rst);
+
+ clk_disable_unprepare(master->core_clk);
+
+ return 0;
+}
+
+static const struct of_device_id dw_i3c_master_of_match[] = {
+ { .compatible = "snps,dw-i3c-master", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, dw_i3c_master_of_match);
+
+static struct platform_driver dw_i3c_driver = {
+ .probe = dw_i3c_probe,
+ .remove = dw_i3c_remove,
+ .driver = {
+ .name = "dw-i3c-master",
+ .of_match_table = of_match_ptr(dw_i3c_master_of_match),
+ },
+};
+module_platform_driver(dw_i3c_driver);
+
+MODULE_AUTHOR("Vitor Soares <soares@...opsys.com>");
+MODULE_DESCRIPTION("DesignWare MIPI I3C driver");
+MODULE_LICENSE("GPL v2");
--
2.7.4
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