/* SPDX-License-Identifier: GPL-2.0 */ /* * Copyright (c) 2023 Code Construct * * Author: Jeremy Kerr <jk@codeconstruct.com.au> */ #include <linux/clk.h> #include <linux/i3c/master.h> #include <linux/reset.h> #include <linux/types.h> #define DW_I3C_MAX_DEVS 32 struct dw_i3c_master_caps { u8 cmdfifodepth; u8 datafifodepth; }; struct dw_i3c_dat_entry { u8 addr; struct i3c_dev_desc *ibi_dev; }; 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]; bool ibi_capable; /* * Per-device hardware data, used to manage the device address table * (DAT) * * Locking: the devs array may be referenced in IRQ context while * processing an IBI. However, IBIs (for a specific device, which * implies a specific DAT entry) can only happen while interrupts are * requested for that device, which is serialised against other * insertions/removals from the array by the global i3c infrastructure. * So, devs_lock protects against concurrent updates to devs->ibi_dev * between request_ibi/free_ibi and the IBI irq event. */ struct dw_i3c_dat_entry devs[DW_I3C_MAX_DEVS]; spinlock_t devs_lock; /* platform-specific data */ const struct dw_i3c_platform_ops *platform_ops; struct work_struct hj_work; }; struct dw_i3c_platform_ops { /* * Called on early bus init: the i3c has been set up, but before any * transactions have taken place. Platform implementations may use to * perform actual device enabling with the i3c core ready. */ int (*init)(struct dw_i3c_master *i3c); /* * Initialise a DAT entry to enable/disable IBIs. Allows the platform * to perform any device workarounds on the DAT entry before * inserting into the hardware table. * * Called with the DAT lock held; must not sleep. */ void (*set_dat_ibi)(struct dw_i3c_master *i3c, struct i3c_dev_desc *dev, bool enable, u32 *reg); }; extern int dw_i3c_common_probe(struct dw_i3c_master *master, struct platform_device *pdev); extern void dw_i3c_common_remove(struct dw_i3c_master *master);