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1/* SPDX-License-Identifier: GPL-2.0 */2/*3 * Copyright (c) 2023 Code Construct4 *5 * Author: Jeremy Kerr <jk@codeconstruct.com.au>6 */7 8#include <linux/clk.h>9#include <linux/i3c/master.h>10#include <linux/reset.h>11#include <linux/types.h>12 13#define DW_I3C_MAX_DEVS 3214 15struct dw_i3c_master_caps {16 u8 cmdfifodepth;17 u8 datafifodepth;18};19 20struct dw_i3c_dat_entry {21 u8 addr;22 bool is_i2c_addr;23 struct i3c_dev_desc *ibi_dev;24};25 26struct dw_i3c_master {27 struct i3c_master_controller base;28 struct device *dev;29 u16 maxdevs;30 u16 datstartaddr;31 u32 free_pos;32 struct {33 struct list_head list;34 struct dw_i3c_xfer *cur;35 spinlock_t lock;36 } xferqueue;37 struct dw_i3c_master_caps caps;38 void __iomem *regs;39 struct reset_control *core_rst;40 struct clk *core_clk;41 struct clk *pclk;42 char version[5];43 char type[5];44 u32 sir_rej_mask;45 bool i2c_slv_prsnt;46 u32 dev_addr;47 u32 i3c_pp_timing;48 u32 i3c_od_timing;49 u32 ext_lcnt_timing;50 u32 bus_free_timing;51 u32 i2c_fm_timing;52 u32 i2c_fmp_timing;53 /*54 * Per-device hardware data, used to manage the device address table55 * (DAT)56 *57 * Locking: the devs array may be referenced in IRQ context while58 * processing an IBI. However, IBIs (for a specific device, which59 * implies a specific DAT entry) can only happen while interrupts are60 * requested for that device, which is serialised against other61 * insertions/removals from the array by the global i3c infrastructure.62 * So, devs_lock protects against concurrent updates to devs->ibi_dev63 * between request_ibi/free_ibi and the IBI irq event.64 */65 struct dw_i3c_dat_entry devs[DW_I3C_MAX_DEVS];66 spinlock_t devs_lock;67 68 /* platform-specific data */69 const struct dw_i3c_platform_ops *platform_ops;70 71 struct work_struct hj_work;72};73 74struct dw_i3c_platform_ops {75 /*76 * Called on early bus init: the i3c has been set up, but before any77 * transactions have taken place. Platform implementations may use to78 * perform actual device enabling with the i3c core ready.79 */80 int (*init)(struct dw_i3c_master *i3c);81 82 /*83 * Initialise a DAT entry to enable/disable IBIs. Allows the platform84 * to perform any device workarounds on the DAT entry before85 * inserting into the hardware table.86 *87 * Called with the DAT lock held; must not sleep.88 */89 void (*set_dat_ibi)(struct dw_i3c_master *i3c,90 struct i3c_dev_desc *dev, bool enable, u32 *reg);91};92 93extern int dw_i3c_common_probe(struct dw_i3c_master *master,94 struct platform_device *pdev);95extern void dw_i3c_common_remove(struct dw_i3c_master *master);96 97