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Message-ID: <aECaFQzkPYdfjagK@lizhi-Precision-Tower-5810>
Date: Wed, 4 Jun 2025 15:10:13 -0400
From: Frank Li <Frank.li@....com>
To: Jorge Marques <jorge.marques@...log.com>
Cc: Alexandre Belloni <alexandre.belloni@...tlin.com>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>, linux-i3c@...ts.infradead.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] i3c: master: Add driver for Analog Devices I3C
Controller IP
On Wed, Jun 04, 2025 at 05:48:58PM +0200, Jorge Marques wrote:
> Add support for Analog Devices I3C Controller IP, an AXI-interfaced IP
> core that supports I3C and I2C devices, multiple speed-grades and
> I3C IBIs.
>
> Signed-off-by: Jorge Marques <jorge.marques@...log.com>
> ---
> MAINTAINERS | 1 +
> drivers/i3c/master/Kconfig | 11 +
> drivers/i3c/master/Makefile | 1 +
> drivers/i3c/master/adi-i3c-master.c | 1063 +++++++++++++++++++++++++++++++++++
> 4 files changed, 1076 insertions(+)
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 6f56e17dcecf902c6812827c1ec3e067c65e9894..9eb5b6c327590725d1641fd4b73e48fc1d1a3954 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -11247,6 +11247,7 @@ I3C DRIVER FOR ANALOG DEVICES I3C CONTROLLER IP
> M: Jorge Marques <jorge.marques@...log.com>
> S: Maintained
> F: Documentation/devicetree/bindings/i3c/adi,i3c-master.yaml
> +F: drivers/i3c/master/adi-i3c-master.c
>
> I3C DRIVER FOR CADENCE I3C MASTER IP
> M: Przemysław Gaj <pgaj@...ence.com>
> diff --git a/drivers/i3c/master/Kconfig b/drivers/i3c/master/Kconfig
> index 7b30db3253af9d5c6aee6544c060e491bfbeb643..328b7145cdefa20e708ebfa3383e849ce51c5a71 100644
> --- a/drivers/i3c/master/Kconfig
> +++ b/drivers/i3c/master/Kconfig
> @@ -1,4 +1,15 @@
> # SPDX-License-Identifier: GPL-2.0-only
> +config ADI_I3C_MASTER
> + tristate "Analog Devices I3C master driver"
> + depends on HAS_IOMEM
> + help
> + Support for Analog Devices I3C Controller IP, an AXI-interfaced IP
> + core that supports I3C and I2C devices, multiple speed-grades and
> + I3C IBIs.
> +
> + This driver can also be built as a module. If so, the module
> + will be called adi-i3c-master.
> +
> config CDNS_I3C_MASTER
> tristate "Cadence I3C master driver"
> depends on HAS_IOMEM
> diff --git a/drivers/i3c/master/Makefile b/drivers/i3c/master/Makefile
> index 3e97960160bc85e5eaf2966ec0c3fae458c2711e..6cc4f4b73e7bdc206b68c750390f9c3cc2ccb199 100644
> --- a/drivers/i3c/master/Makefile
> +++ b/drivers/i3c/master/Makefile
> @@ -1,4 +1,5 @@
> # SPDX-License-Identifier: GPL-2.0-only
> +obj-$(CONFIG_ADI_I3C_MASTER) += adi-i3c-master.o
> obj-$(CONFIG_CDNS_I3C_MASTER) += i3c-master-cdns.o
> obj-$(CONFIG_DW_I3C_MASTER) += dw-i3c-master.o
> obj-$(CONFIG_AST2600_I3C_MASTER) += ast2600-i3c-master.o
> diff --git a/drivers/i3c/master/adi-i3c-master.c b/drivers/i3c/master/adi-i3c-master.c
> new file mode 100644
> index 0000000000000000000000000000000000000000..6f44b0b6fc2020bb0131e8e2943806c0a9d9ce7b
> --- /dev/null
> +++ b/drivers/i3c/master/adi-i3c-master.c
> @@ -0,0 +1,1063 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * I3C Controller driver
> + * Copyright 2024 Analog Devices Inc.
2025?
> + * Author: Jorge Marques <jorge.marques@...log.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/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +
> +#define VERSION_MAJOR(x) (((x) >> 16) & 0xff)
> +#define VERSION_MINOR(x) (((x) >> 8) & 0xff)
> +#define VERSION_PATCH(x) ((x) & 0xff)
Can you use GEN_MASK and FIELD_GET macro for it?
> +
> +#define MAX_DEVS 16
> +
> +#define REG_VERSION 0x000
> +#define REG_ENABLE 0x040
> +#define REG_IRQ_MASK 0x080
> +#define REG_IRQ_PENDING 0x084
> +#define REG_CMD_FIFO 0x0d4
> +#define REG_CMDR_FIFO 0x0d8
> +#define REG_SDO_FIFO 0x0dc
> +#define REG_SDI_FIFO 0x0e0
> +#define REG_IBI_FIFO 0x0e4
> +#define REG_FIFO_STATUS 0x0e8
> +#define REG_OPS 0x100
> +#define REG_IBI_CONFIG 0x140
> +#define REG_DEV_CHAR 0x180
> +
> +#define CMD0_FIFO_IS_CCC BIT(22)
> +#define CMD0_FIFO_BCAST BIT(21)
> +#define CMD0_FIFO_SR BIT(20)
> +#define CMD0_FIFO_LEN(l) ((l) << 8)
> +#define CMD0_FIFO_LEN_MAX 4095
> +#define CMD0_FIFO_DEV_ADDR(a) ((a) << 1)
> +#define CMD0_FIFO_RNW BIT(0)
> +
> +#define CMD1_FIFO_CCC(id) ((id) & GENMASK(7, 0))
> +
> +#define CMDR_NO_ERROR 0
> +#define CMDR_CE0_ERROR 1
> +#define CMDR_CE2_ERROR 4
> +#define CMDR_NACK_RESP 6
> +#define CMDR_UDA_ERROR 8
> +#define CMDR_ERROR(x) (((x) & GENMASK(23, 20)) >> 20)
> +#define CMDR_XFER_BYTES(x) (((x) & GENMASK(19, 8)) >> 8)
use GET_FIELD
> +
> +#define FIFO_STATUS_CMDR_EMPTY BIT(0)
> +#define FIFO_STATUS_IBI_EMPTY BIT(1)
> +#define IRQ_PENDING_CMDR_PENDING BIT(5)
> +#define IRQ_PENDING_IBI_PENDING BIT(6)
> +#define IRQ_PENDING_DAA_PENDING BIT(7)
> +
> +#define DEV_CHAR_IS_I2C BIT(0)
> +#define DEV_CHAR_IS_ATTACHED BIT(1)
> +#define DEV_CHAR_BCR_IBI(x) (((x) & GENMASK(2, 1)) << 1)
> +#define DEV_CHAR_WEN BIT(8)
> +#define DEV_CHAR_ADDR(x) (((x) & GENMASK(6, 0)) << 9)
The same here.
> +
> +#define REG_OPS_SET_SG(x) ((x) << 5)
> +#define REG_OPS_PP_SG_MASK GENMASK(6, 5)
> +
> +#define REG_IBI_CONFIG_LISTEN BIT(1)
> +#define REG_IBI_CONFIG_ENABLE BIT(0)
> +
> +enum speed_grade {PP_SG_UNSET, PP_SG_1MHZ, PP_SG_3MHZ, PP_SG_6MHZ, PP_SG_12MHZ};
> +struct adi_i3c_cmd {
> + u32 cmd0;
> + u32 cmd1;
> + u32 tx_len;
> + const void *tx_buf;
> + u32 rx_len;
> + void *rx_buf;
> + u32 error;
> +};
> +
> +struct adi_i3c_xfer {
> + struct list_head node;
> + struct completion comp;
> + int ret;
> + unsigned int ncmds;
> + unsigned int ncmds_comp;
> + struct adi_i3c_cmd cmds[];
> +};
> +
> +struct adi_i3c_master {
> + 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; /* Protect IBI slot access */
> + } ibi;
> + struct {
> + struct list_head list;
> + struct adi_i3c_xfer *cur;
> + spinlock_t lock; /* Protect transfer */
> + } xferqueue;
> + void __iomem *regs;
> + struct clk *clk;
> + unsigned long i3c_scl_lim;
> + struct {
> + u8 addrs[MAX_DEVS];
> + u8 index;
> + } daa;
> +};
> +
> +static inline struct adi_i3c_master *to_adi_i3c_master(struct i3c_master_controller *master)
> +{
> + return container_of(master, struct adi_i3c_master, base);
> +}
> +
> +static void adi_i3c_master_wr_to_tx_fifo(struct adi_i3c_master *master,
> + const u8 *bytes, int nbytes)
> +{
> + writesl(master->regs + REG_SDO_FIFO, bytes, nbytes / 4);
> + if (nbytes & 3) {
> + u32 tmp = 0;
> +
> + memcpy(&tmp, bytes + (nbytes & ~3), nbytes & 3);
ALIGN_DOWN(bytes, 4)?
Do you need conside big/little endian to trim down data?
> + writesl(master->regs + REG_SDO_FIFO, &tmp, 1);
writel() is enough
> + }
> +}
> +
> +static void adi_i3c_master_rd_from_rx_fifo(struct adi_i3c_master *master,
> + u8 *bytes, int nbytes)
> +{
> + readsl(master->regs + REG_SDI_FIFO, bytes, nbytes / 4);
> + if (nbytes & 3) {
> + u32 tmp;
> +
> + readsl(master->regs + REG_SDI_FIFO, &tmp, 1);
readl()
> + memcpy(bytes + (nbytes & ~3), &tmp, nbytes & 3);
> + }
> +}
> +
> +static bool adi_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_RSTDAA(true):
> + case I3C_CCC_RSTDAA(false):
> + case I3C_CCC_ENTDAA:
> + 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_GETHDRCAP:
> + return true;
> + default:
> + break;
> + }
> +
> + return false;
> +}
> +
> +static int adi_i3c_master_disable(struct adi_i3c_master *master)
> +{
> + writel(~REG_IBI_CONFIG_LISTEN | ~REG_IBI_CONFIG_ENABLE,
> + master->regs + REG_IBI_CONFIG);
> +
> + return 0;
> +}
> +
> +static struct adi_i3c_xfer *adi_i3c_master_alloc_xfer(struct adi_i3c_master *master,
> + unsigned int ncmds)
> +{
> + struct adi_i3c_xfer *xfer;
> +
> + xfer = kzalloc(struct_size(xfer, cmds, ncmds), GFP_KERNEL);
> + if (!xfer)
> + return NULL;
> +
> + INIT_LIST_HEAD(&xfer->node);
> + xfer->ncmds = ncmds;
> + xfer->ret = -ETIMEDOUT;
> +
> + return xfer;
> +}
> +
> +static void adi_i3c_master_start_xfer_locked(struct adi_i3c_master *master)
> +{
> + struct adi_i3c_xfer *xfer = master->xferqueue.cur;
> + unsigned int i;
> +
> + if (!xfer)
> + return;
> +
> + for (i = 0; i < xfer->ncmds; i++) {
> + struct adi_i3c_cmd *cmd = &xfer->cmds[i];
> +
> + adi_i3c_master_wr_to_tx_fifo(master, cmd->tx_buf, cmd->tx_len);
what's happen if data length bigger than fifo size?
> + }
> +
> + for (i = 0; i < xfer->ncmds; i++) {
> + struct adi_i3c_cmd *cmd = &xfer->cmds[i];
> +
> + writel(cmd->cmd0, master->regs + REG_CMD_FIFO);
> + if (cmd->cmd0 & CMD0_FIFO_IS_CCC)
> + writel(cmd->cmd1, master->regs + REG_CMD_FIFO);
> + }
> +}
> +
> +static void adi_i3c_master_end_xfer_locked(struct adi_i3c_master *master,
> + u32 pending)
> +{
> + struct adi_i3c_xfer *xfer = master->xferqueue.cur;
> + int i, ret = 0;
> + u32 status0;
> +
> + if (!xfer)
> + return;
> +
> + for (status0 = readl(master->regs + REG_FIFO_STATUS);
> + !(status0 & FIFO_STATUS_CMDR_EMPTY);
> + status0 = readl(master->regs + REG_FIFO_STATUS)) {
> + struct adi_i3c_cmd *cmd;
> + u32 cmdr, rx_len;
> +
> + cmdr = readl(master->regs + REG_CMDR_FIFO);
> +
> + cmd = &xfer->cmds[xfer->ncmds_comp++];
> + rx_len = min_t(u32, CMDR_XFER_BYTES(cmdr), cmd->rx_len);
> + adi_i3c_master_rd_from_rx_fifo(master, cmd->rx_buf, rx_len);
> + cmd->error = CMDR_ERROR(cmdr);
what happen if cmds[0] is write, cmds[1] is read.
> + }
> +
> + for (i = 0; i < xfer->ncmds; i++) {
> + switch (xfer->cmds[i].error) {
> + case CMDR_NO_ERROR:
> + break;
> +
> + case CMDR_CE0_ERROR:
> + case CMDR_CE2_ERROR:
> + case CMDR_NACK_RESP:
> + case CMDR_UDA_ERROR:
> + ret = -EIO;
> + break;
> +
> + default:
> + ret = -EINVAL;
> + break;
> + }
> + }
> +
> + xfer->ret = ret;
> +
> + if (xfer->ncmds_comp != xfer->ncmds)
> + return;
> +
> + complete(&xfer->comp);
> +
> + xfer = list_first_entry_or_null(&master->xferqueue.list,
> + struct adi_i3c_xfer, node);
> + if (xfer)
> + list_del_init(&xfer->node);
> +
> + master->xferqueue.cur = xfer;
> + adi_i3c_master_start_xfer_locked(master);
> +}
> +
> +static void adi_i3c_master_queue_xfer(struct adi_i3c_master *master,
> + struct adi_i3c_xfer *xfer)
> +{
> + unsigned long flags;
> +
> + init_completion(&xfer->comp);
> + spin_lock_irqsave(&master->xferqueue.lock, flags);
suggest use guard(spinlock_irqsave)
> + if (master->xferqueue.cur) {
> + list_add_tail(&xfer->node, &master->xferqueue.list);
> + } else {
> + master->xferqueue.cur = xfer;
> + adi_i3c_master_start_xfer_locked(master);
> + }
> + spin_unlock_irqrestore(&master->xferqueue.lock, flags);
> +}
> +
> +static void adi_i3c_master_unqueue_xfer(struct adi_i3c_master *master,
> + struct adi_i3c_xfer *xfer)
> +{
> + unsigned long flags;
> +
> + spin_lock_irqsave(&master->xferqueue.lock, flags);
> + if (master->xferqueue.cur == xfer)
> + master->xferqueue.cur = NULL;
> + else
> + list_del_init(&xfer->node);
> +
> + writel(0x01, master->regs + REG_ENABLE);
> + writel(0x00, master->regs + REG_ENABLE);
> + writel(IRQ_PENDING_CMDR_PENDING, master->regs + REG_IRQ_MASK);
> +
> + spin_unlock_irqrestore(&master->xferqueue.lock, flags);
> +}
> +
> +static enum i3c_error_code adi_i3c_cmd_get_err(struct adi_i3c_cmd *cmd)
> +{
> + switch (cmd->error) {
> + case CMDR_CE0_ERROR:
> + return I3C_ERROR_M0;
> +
> + case CMDR_CE2_ERROR:
> + case CMDR_NACK_RESP:
> + return I3C_ERROR_M2;
> +
> + default:
> + break;
> + }
> +
> + return I3C_ERROR_UNKNOWN;
> +}
> +
> +static int adi_i3c_master_send_ccc_cmd(struct i3c_master_controller *m,
> + struct i3c_ccc_cmd *cmd)
> +{
> + struct adi_i3c_master *master = to_adi_i3c_master(m);
> + struct adi_i3c_xfer *xfer;
> + struct adi_i3c_cmd *ccmd;
> +
> + xfer = adi_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_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;
> + }
> +
> + adi_i3c_master_queue_xfer(master, xfer);
> + if (!wait_for_completion_timeout(&xfer->comp, msecs_to_jiffies(1000)))
> + adi_i3c_master_unqueue_xfer(master, xfer);
> +
> + cmd->err = adi_i3c_cmd_get_err(&xfer->cmds[0]);
> + kfree(xfer);
> +
> + return 0;
> +}
> +
> +static int adi_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 adi_i3c_master *master = to_adi_i3c_master(m);
> + struct adi_i3c_xfer *xfer;
> + int i, ret;
> +
> + for (i = 0; i < nxfers; i++) {
> + if (xfers[i].len > CMD0_FIFO_LEN_MAX)
> + return -EOPNOTSUPP;
> + }
> +
> + if (!nxfers)
> + return 0;
> +
> + xfer = adi_i3c_master_alloc_xfer(master, nxfers);
> + if (!xfer)
> + return -ENOMEM;
> +
> + for (i = 0; i < nxfers; i++) {
> + struct adi_i3c_cmd *ccmd = &xfer->cmds[i];
> +
> + ccmd->cmd0 = CMD0_FIFO_DEV_ADDR(dev->info.dyn_addr);
> +
> + if (xfers[i].rnw) {
> + ccmd->cmd0 |= CMD0_FIFO_RNW;
> + ccmd->rx_buf = xfers[i].data.in;
> + ccmd->rx_len = xfers[i].len;
> + } else {
> + ccmd->tx_buf = xfers[i].data.out;
> + ccmd->tx_len = xfers[i].len;
> + }
> +
> + ccmd->cmd0 |= CMD0_FIFO_LEN(xfers[i].len);
> +
> + if (i < nxfers - 1)
> + ccmd->cmd0 |= CMD0_FIFO_SR;
> +
> + if (!i)
> + ccmd->cmd0 |= CMD0_FIFO_BCAST;
> + }
> +
> + adi_i3c_master_queue_xfer(master, xfer);
> + if (!wait_for_completion_timeout(&xfer->comp,
> + msecs_to_jiffies(1000)))
> + adi_i3c_master_unqueue_xfer(master, xfer);
> +
> + ret = xfer->ret;
> +
> + for (i = 0; i < nxfers; i++)
> + xfers[i].err = adi_i3c_cmd_get_err(&xfer->cmds[i]);
> +
> + kfree(xfer);
> +
> + return ret;
> +}
> +
> +struct adi_i3c_i2c_dev_data {
> + u16 id;
> + s16 ibi;
> + struct i3c_generic_ibi_pool *ibi_pool;
> +};
> +
> +static int adi_i3c_master_get_rr_slot(struct adi_i3c_master *master,
> + u8 dyn_addr)
> +{
> + if (!master->free_rr_slots)
> + return -ENOSPC;
> +
> + return ffs(master->free_rr_slots) - 1;
> +}
> +
> +static int adi_i3c_master_reattach_i3c_dev(struct i3c_dev_desc *dev, u8 dyn_addr)
> +{
> + struct i3c_master_controller *m = i3c_dev_get_master(dev);
> + struct adi_i3c_master *master = to_adi_i3c_master(m);
> + u8 addr;
> +
> + addr = dev->info.dyn_addr ? dev->info.dyn_addr : dev->info.static_addr;
> +
> + writel(DEV_CHAR_ADDR(dyn_addr), master->regs + REG_DEV_CHAR);
> + writel((readl(master->regs + REG_DEV_CHAR) &
> + ~DEV_CHAR_IS_ATTACHED) | DEV_CHAR_WEN,
> + master->regs + REG_DEV_CHAR);
> +
> + writel(DEV_CHAR_ADDR(addr), master->regs + REG_DEV_CHAR);
> + writel(readl(master->regs + REG_DEV_CHAR) |
> + DEV_CHAR_IS_ATTACHED | DEV_CHAR_WEN,
> + master->regs + REG_DEV_CHAR);
> +
> + return 0;
> +}
> +
> +static int adi_i3c_master_attach_i3c_dev(struct i3c_dev_desc *dev)
> +{
> + struct i3c_master_controller *m = i3c_dev_get_master(dev);
> + struct adi_i3c_master *master = to_adi_i3c_master(m);
> + struct adi_i3c_i2c_dev_data *data;
> + int slot;
> + u8 addr;
> +
> + data = kzalloc(sizeof(*data), GFP_KERNEL);
> + if (!data)
> + return -ENOMEM;
> +
> + slot = adi_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);
> +
> + addr = dev->info.dyn_addr ? dev->info.dyn_addr : dev->info.static_addr;
> +
> + writel(DEV_CHAR_ADDR(addr), master->regs + REG_DEV_CHAR);
> + writel(readl(master->regs + REG_DEV_CHAR) |
> + DEV_CHAR_IS_ATTACHED | DEV_CHAR_WEN,
> + master->regs + REG_DEV_CHAR);
> +
> + return 0;
> +}
> +
> +static void adi_i3c_master_sync_dev_char(struct i3c_master_controller *m)
> +{
> + struct adi_i3c_master *master = to_adi_i3c_master(m);
> + struct i3c_dev_desc *i3cdev;
> + u8 addr;
> +
> + i3c_bus_for_each_i3cdev(&m->bus, i3cdev) {
> + addr = i3cdev->info.dyn_addr ?
> + i3cdev->info.dyn_addr : i3cdev->info.static_addr;
> + writel(DEV_CHAR_ADDR(addr), master->regs + REG_DEV_CHAR);
> + writel(readl(master->regs + REG_DEV_CHAR) |
> + DEV_CHAR_BCR_IBI(i3cdev->info.bcr) | DEV_CHAR_WEN,
> + master->regs + REG_DEV_CHAR);
> + }
> +}
> +
> +static void adi_i3c_master_detach_i3c_dev(struct i3c_dev_desc *dev)
> +{
> + struct i3c_master_controller *m = i3c_dev_get_master(dev);
> + struct adi_i3c_master *master = to_adi_i3c_master(m);
> + struct adi_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev);
> + u8 addr;
> +
> + addr = dev->info.dyn_addr ? dev->info.dyn_addr : dev->info.static_addr;
> +
> + writel(DEV_CHAR_ADDR(addr), master->regs + REG_DEV_CHAR);
> + writel((readl(master->regs + REG_DEV_CHAR) &
> + ~DEV_CHAR_IS_ATTACHED) | DEV_CHAR_WEN,
> + master->regs + REG_DEV_CHAR);
> +
> + i3c_dev_set_master_data(dev, NULL);
> + master->free_rr_slots |= BIT(data->id);
> + kfree(data);
> +}
> +
> +static int adi_i3c_master_attach_i2c_dev(struct i2c_dev_desc *dev)
> +{
> + struct i3c_master_controller *m = i2c_dev_get_master(dev);
> + struct adi_i3c_master *master = to_adi_i3c_master(m);
> + struct adi_i3c_i2c_dev_data *data;
> + int slot;
> +
> + slot = adi_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(DEV_CHAR_ADDR(dev->addr) |
> + DEV_CHAR_IS_I2C | DEV_CHAR_IS_ATTACHED | DEV_CHAR_WEN,
> + master->regs + REG_DEV_CHAR);
> +
> + return 0;
> +}
> +
> +static void adi_i3c_master_detach_i2c_dev(struct i2c_dev_desc *dev)
> +{
> + struct i3c_master_controller *m = i2c_dev_get_master(dev);
> + struct adi_i3c_master *master = to_adi_i3c_master(m);
> + struct adi_i3c_i2c_dev_data *data = i2c_dev_get_master_data(dev);
> +
> + writel(DEV_CHAR_ADDR(dev->addr) |
> + DEV_CHAR_IS_I2C | DEV_CHAR_WEN,
> + master->regs + REG_DEV_CHAR);
> +
> + i2c_dev_set_master_data(dev, NULL);
> + master->free_rr_slots |= BIT(data->id);
> + kfree(data);
> +}
> +
> +static void adi_i3c_master_bus_cleanup(struct i3c_master_controller *m)
> +{
> + struct adi_i3c_master *master = to_adi_i3c_master(m);
> +
> + adi_i3c_master_disable(master);
> +}
> +
> +static void adi_i3c_master_upd_i3c_scl_lim(struct adi_i3c_master *master)
> +{
> + struct i3c_master_controller *m = &master->base;
> + struct i3c_bus *bus = i3c_master_get_bus(m);
> + u8 i3c_scl_lim = 0;
> + struct i3c_dev_desc *dev;
> + u8 pp_sg;
> +
> + i3c_bus_for_each_i3cdev(bus, dev) {
> + u8 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 = PP_SG_6MHZ;
> + break;
> + case I3C_SDR2_FSCL_6MHZ:
> + max_fscl = PP_SG_3MHZ;
> + break;
> + case I3C_SDR3_FSCL_4MHZ:
> + max_fscl = PP_SG_3MHZ;
> + break;
> + case I3C_SDR4_FSCL_2MHZ:
> + max_fscl = PP_SG_1MHZ;
> + break;
> + case I3C_SDR0_FSCL_MAX:
> + default:
> + max_fscl = PP_SG_12MHZ;
> + break;
> + }
> +
> + if (max_fscl &&
> + (i3c_scl_lim > max_fscl || !i3c_scl_lim))
> + i3c_scl_lim = max_fscl;
> + }
> +
> + if (!i3c_scl_lim)
> + return;
> +
> + master->i3c_scl_lim = i3c_scl_lim - 1;
> +
> + pp_sg = readl(master->regs + REG_OPS) &
> + ~REG_OPS_PP_SG_MASK;
> +
> + pp_sg |= REG_OPS_SET_SG(master->i3c_scl_lim);
> +
> + writel(pp_sg, master->regs + REG_OPS);
> +}
> +
> +static void adi_i3c_master_get_features(struct adi_i3c_master *master,
> + unsigned int slot,
> + struct i3c_device_info *info)
> +{
> + memset(info, 0, sizeof(*info));
> +
> + info->dyn_addr = 0x31;
> + info->dcr = 0x00;
> + info->bcr = 0x40;
> + info->pid = 0;
> +}
> +
> +static int adi_i3c_master_do_daa(struct i3c_master_controller *m)
> +{
> + struct adi_i3c_master *master = to_adi_i3c_master(m);
> + int ret;
> + u32 irq_mask;
> +
> + master->daa.index = 0x8;
> + for (u8 i = 0; i < MAX_DEVS; i++) {
Not sure why need pre-alloc MAX_DEVS address here?
> + ret = i3c_master_get_free_addr(m, master->daa.index);
> + if (ret < 0)
> + return -ENOSPC;
> +
> + master->daa.index = ret;
> + master->daa.addrs[i] = master->daa.index;
> + }
> + /* Will be reused as index for daa.addrs */
> + master->daa.index = 0;
> +
> + irq_mask = readl(master->regs + REG_IRQ_MASK);
> + writel(irq_mask | IRQ_PENDING_DAA_PENDING,
> + master->regs + REG_IRQ_MASK);
> +
> + ret = i3c_master_entdaa_locked(&master->base);
> +
> + writel(irq_mask, master->regs + REG_IRQ_MASK);
> +
> + /* DAA always finishes with CE2_ERROR or NACK_RESP */
> + if (ret && ret != I3C_ERROR_M2)
> + return ret;
> +
> + /* Add I3C devices discovered */
> + for (u8 i = 0; i < master->daa.index; i++)
> + i3c_master_add_i3c_dev_locked(m, master->daa.addrs[i]);
> + /* Sync retrieved devs info with the IP */
> + adi_i3c_master_sync_dev_char(m);
> +
> + i3c_master_defslvs_locked(&master->base);
> +
> + adi_i3c_master_upd_i3c_scl_lim(master);
> +
> + return 0;
> +}
> +
> +static int adi_i3c_master_bus_init(struct i3c_master_controller *m)
> +{
> + struct adi_i3c_master *master = to_adi_i3c_master(m);
> + struct i3c_device_info info = { };
> + int ret;
> +
> + ret = i3c_master_get_free_addr(m, 0);
> + if (ret < 0)
> + return ret;
> +
> + adi_i3c_master_get_features(master, 0, &info);
> + ret = i3c_master_set_info(&master->base, &info);
> + if (ret)
> + return ret;
> +
> + writel(REG_IBI_CONFIG_LISTEN | ~REG_IBI_CONFIG_ENABLE,
> + master->regs + REG_IBI_CONFIG);
> +
> + return 0;
> +}
> +
> +static void adi_i3c_master_handle_ibi(struct adi_i3c_master *master,
> + u32 ibi)
> +{
> + struct adi_i3c_i2c_dev_data *data;
> + struct i3c_ibi_slot *slot;
> + struct i3c_dev_desc *dev;
> + u8 da, id;
> + u8 *mdb;
> +
> + da = (ibi >> 17) & GENMASK(6, 0);
> + for (id = 0; id < master->ibi.num_slots; id++) {
> + if (master->ibi.slots[id] &&
> + master->ibi.slots[id]->info.dyn_addr == da)
> + break;
> + }
> +
> + if (id == master->ibi.num_slots)
> + return;
> +
> + dev = master->ibi.slots[id];
> + spin_lock(&master->ibi.lock);
use guard(spin_lock);
> +
> + data = i3c_dev_get_master_data(dev);
> + slot = i3c_generic_ibi_get_free_slot(data->ibi_pool);
> + if (!slot)
> + goto out_unlock;
> +
> + mdb = slot->data;
> + mdb[0] = (ibi >> 8) & GENMASK(7, 0);
> +
> + slot->len = 1;
> + i3c_master_queue_ibi(dev, slot);
> +
> +out_unlock:
> + spin_unlock(&master->ibi.lock);
> +}
> +
> +static void adi_i3c_master_demux_ibis(struct adi_i3c_master *master)
> +{
> + u32 status0;
> +
> + for (status0 = readl(master->regs + REG_FIFO_STATUS);
> + !(status0 & FIFO_STATUS_IBI_EMPTY);
> + status0 = readl(master->regs + REG_FIFO_STATUS)) {
> + u32 ibi = readl(master->regs + REG_IBI_FIFO);
> +
> + adi_i3c_master_handle_ibi(master, ibi);
> + }
> +}
> +
> +static void adi_i3c_master_handle_da_req(struct adi_i3c_master *master)
> +{
> + u8 payload0[8];
> + u32 addr;
> +
> + /* Clear device characteristics */
> + adi_i3c_master_rd_from_rx_fifo(master, payload0, 6);
> + addr = master->daa.addrs[master->daa.index++];
> + addr = (addr << 1) | !parity8(addr);
> +
> + writel(addr, master->regs + REG_SDO_FIFO);
> +}
> +
> +static irqreturn_t adi_i3c_master_irq(int irq, void *data)
> +{
> + struct adi_i3c_master *master = data;
> + u32 pending;
> +
> + pending = readl_relaxed(master->regs + REG_IRQ_PENDING);
> + if (pending & IRQ_PENDING_CMDR_PENDING) {
> + spin_lock(&master->xferqueue.lock);
> + adi_i3c_master_end_xfer_locked(master, pending);
> + spin_unlock(&master->xferqueue.lock);
> + }
> + if (pending & IRQ_PENDING_IBI_PENDING)
> + adi_i3c_master_demux_ibis(master);
> + if (pending & IRQ_PENDING_DAA_PENDING)
> + adi_i3c_master_handle_da_req(master);
> + writel_relaxed(pending, master->regs + REG_IRQ_PENDING);
this need move just after readl_relaxed().
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int adi_i3c_master_i2c_xfers(struct i2c_dev_desc *dev,
> + struct i2c_msg *xfers,
> + int nxfers)
> +{
> + struct i3c_master_controller *m = i2c_dev_get_master(dev);
> + struct adi_i3c_master *master = to_adi_i3c_master(m);
> + struct adi_i3c_xfer *xfer;
> + int i, ret;
> +
> + for (i = 0; i < nxfers; i++) {
> + if (xfers[i].len > CMD0_FIFO_LEN_MAX)
> + return -EOPNOTSUPP;
> + if (xfers[i].flags & I2C_M_TEN)
> + return -EOPNOTSUPP;
> + }
> +
> + if (!nxfers)
> + return 0;
> +
> + xfer = adi_i3c_master_alloc_xfer(master, nxfers);
> + if (!xfer)
> + return -ENOMEM;
> +
> + for (i = 0; i < nxfers; i++) {
> + struct adi_i3c_cmd *ccmd = &xfer->cmds[i];
> +
> + ccmd->cmd0 = CMD0_FIFO_DEV_ADDR(xfers[i].addr);
> +
> + 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;
> + }
> +
> + ccmd->cmd0 |= CMD0_FIFO_LEN(xfers[i].len);
> + }
> +
> + adi_i3c_master_queue_xfer(master, xfer);
> + if (!wait_for_completion_timeout(&xfer->comp,
> + msecs_to_jiffies(1000)))
> + adi_i3c_master_unqueue_xfer(master, xfer);
> +
> + ret = xfer->ret;
> + kfree(xfer);
> + return ret;
> +}
> +
> +static int adi_i3c_master_disable_ibi(struct i3c_dev_desc *dev)
> +{
> + struct i3c_master_controller *m = i3c_dev_get_master(dev);
> + struct adi_i3c_master *master = to_adi_i3c_master(m);
> + struct i3c_dev_desc *i3cdev;
> + bool enabled = 0;
enabled = false if you use bool type.
> + int ret;
> +
> + ret = i3c_master_disec_locked(m, dev->info.dyn_addr,
> + I3C_CCC_EVENT_SIR);
> +
> + i3c_bus_for_each_i3cdev(&m->bus, i3cdev) {
> + if (dev != i3cdev && i3cdev->ibi)
> + enabled |= i3cdev->ibi->enabled;
if you use | here, suggest use u32 enabled
> + }
> + if (!enabled) {
> + writel(REG_IBI_CONFIG_LISTEN | ~REG_IBI_CONFIG_ENABLE,
> + master->regs + REG_IBI_CONFIG);
> + writel(readl(master->regs + REG_IRQ_MASK) | ~IRQ_PENDING_IBI_PENDING,
> + master->regs + REG_IRQ_MASK);
> + }
> +
> + return ret;
> +}
> +
> +static int adi_i3c_master_enable_ibi(struct i3c_dev_desc *dev)
> +{
> + struct i3c_master_controller *m = i3c_dev_get_master(dev);
> + struct adi_i3c_master *master = to_adi_i3c_master(m);
> +
> + writel(REG_IBI_CONFIG_LISTEN | REG_IBI_CONFIG_ENABLE,
> + master->regs + REG_IBI_CONFIG);
> +
> + writel(readl(master->regs + REG_IRQ_MASK) | IRQ_PENDING_IBI_PENDING,
> + master->regs + REG_IRQ_MASK);
> +
> + return i3c_master_enec_locked(m, dev->info.dyn_addr,
> + I3C_CCC_EVENT_SIR);
> +}
> +
> +static int adi_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 adi_i3c_master *master = to_adi_i3c_master(m);
> + struct adi_i3c_i2c_dev_data *data;
> + unsigned long flags;
> + unsigned int i;
> +
> + data = i3c_dev_get_master_data(dev);
> + 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 adi_i3c_master_free_ibi(struct i3c_dev_desc *dev)
> +{
> + struct i3c_master_controller *m = i3c_dev_get_master(dev);
> + struct adi_i3c_master *master = to_adi_i3c_master(m);
> + struct adi_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 adi_i3c_master_recycle_ibi_slot(struct i3c_dev_desc *dev,
> + struct i3c_ibi_slot *slot)
> +{
> + struct adi_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 adi_i3c_master_ops = {
> + .bus_init = adi_i3c_master_bus_init,
> + .bus_cleanup = adi_i3c_master_bus_cleanup,
> + .attach_i3c_dev = adi_i3c_master_attach_i3c_dev,
> + .reattach_i3c_dev = adi_i3c_master_reattach_i3c_dev,
> + .detach_i3c_dev = adi_i3c_master_detach_i3c_dev,
> + .attach_i2c_dev = adi_i3c_master_attach_i2c_dev,
> + .detach_i2c_dev = adi_i3c_master_detach_i2c_dev,
> + .do_daa = adi_i3c_master_do_daa,
> + .supports_ccc_cmd = adi_i3c_master_supports_ccc_cmd,
> + .send_ccc_cmd = adi_i3c_master_send_ccc_cmd,
> + .priv_xfers = adi_i3c_master_priv_xfers,
> + .i2c_xfers = adi_i3c_master_i2c_xfers,
> + .request_ibi = adi_i3c_master_request_ibi,
> + .enable_ibi = adi_i3c_master_enable_ibi,
> + .disable_ibi = adi_i3c_master_disable_ibi,
> + .free_ibi = adi_i3c_master_free_ibi,
> + .recycle_ibi_slot = adi_i3c_master_recycle_ibi_slot,
> +};
> +
> +static const struct of_device_id adi_i3c_master_of_match[] = {
> + { .compatible = "adi,i3c-master" },
> + {}
> +};
> +
> +static int adi_i3c_master_probe(struct platform_device *pdev)
> +{
> + struct adi_i3c_master *master;
> + unsigned int version;
> + int ret, irq;
> +
> + master = devm_kzalloc(&pdev->dev, sizeof(*master), GFP_KERNEL);
> + if (!master)
> + return -ENOMEM;
> +
> + master->regs = devm_platform_ioremap_resource(pdev, 0);
> + if (IS_ERR(master->regs))
> + return PTR_ERR(master->regs);
> +
> + master->clk = devm_clk_get(&pdev->dev, "s_axi_aclk");
> + if (IS_ERR(master->clk))
> + return PTR_ERR(master->clk);
> +
> + irq = platform_get_irq(pdev, 0);
> + if (irq < 0)
> + return irq;
> +
> + ret = clk_prepare_enable(master->clk);
use devm_clk_get_enabled() instead of devm_clk_get() to simple err handle.
> + if (ret)
> + goto err_clk_disable;
> +
> + version = readl(master->regs + REG_VERSION);
> + if (VERSION_MAJOR(version) != 0) {
> + dev_err(&pdev->dev, "Unsupported IP version %u.%u.%c\n",
> + VERSION_MAJOR(version),
> + VERSION_MINOR(version),
> + VERSION_PATCH(version));
> + ret = -EINVAL;
> + goto err_clk_disable;
> + }
> +
> + writel(0x00, master->regs + REG_ENABLE);
> + writel(0x00, master->regs + REG_IRQ_MASK);
> +
> + ret = devm_request_irq(&pdev->dev, irq, adi_i3c_master_irq, 0,
> + dev_name(&pdev->dev), master);
> + if (ret)
> + goto err_clk_disable;
needn't goto if you use devm_clk_get_enabled()
Frank
> +
> + platform_set_drvdata(pdev, master);
> +
> + master->maxdevs = MAX_DEVS;
> + master->free_rr_slots = GENMASK(master->maxdevs, 1);
> +
> + writel(IRQ_PENDING_CMDR_PENDING, master->regs + REG_IRQ_MASK);
> +
> + spin_lock_init(&master->ibi.lock);
> + master->ibi.num_slots = 15;
> + master->ibi.slots = devm_kcalloc(&pdev->dev, master->ibi.num_slots,
> + sizeof(*master->ibi.slots),
> + GFP_KERNEL);
> + if (!master->ibi.slots) {
> + ret = -ENOMEM;
> + goto err_clk_disable;
> + }
> +
> + ret = i3c_master_register(&master->base, &pdev->dev,
> + &adi_i3c_master_ops, false);
> + if (ret)
> + goto err_clk_disable;
> +
> + return 0;
> +
> +err_clk_disable:
> + clk_disable_unprepare(master->clk);
> +
> + return ret;
> +}
> +
> +static void adi_i3c_master_remove(struct platform_device *pdev)
> +{
> + struct adi_i3c_master *master = platform_get_drvdata(pdev);
> +
> + i3c_master_unregister(&master->base);
> +
> + writel(0xff, master->regs + REG_IRQ_PENDING);
> + writel(0x00, master->regs + REG_IRQ_MASK);
> + writel(0x01, master->regs + REG_ENABLE);
> +
> + clk_disable_unprepare(master->clk);
> +}
> +
> +static struct platform_driver adi_i3c_master = {
> + .probe = adi_i3c_master_probe,
> + .remove = adi_i3c_master_remove,
> + .driver = {
> + .name = "adi-i3c-master",
> + .of_match_table = adi_i3c_master_of_match,
> + },
> +};
> +module_platform_driver(adi_i3c_master);
> +
> +MODULE_AUTHOR("Jorge Marques <jorge.marques@...log.com>");
> +MODULE_DESCRIPTION("Analog Devices I3C master driver");
> +MODULE_LICENSE("GPL");
>
> --
> 2.49.0
>
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