1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright (c) 2023 Code Construct
9 #include <linux/i3c/master.h>
10 #include <linux/reset.h>
11 #include <linux/types.h>
13 #define DW_I3C_MAX_DEVS 32
15 struct dw_i3c_master_caps {
20 struct dw_i3c_dat_entry {
23 struct i3c_dev_desc *ibi_dev;
26 struct dw_i3c_master {
27 struct i3c_master_controller base;
33 struct list_head list;
34 struct dw_i3c_xfer *cur;
37 struct dw_i3c_master_caps caps;
39 struct reset_control *core_rst;
54 * Per-device hardware data, used to manage the device address table
57 * Locking: the devs array may be referenced in IRQ context while
58 * processing an IBI. However, IBIs (for a specific device, which
59 * implies a specific DAT entry) can only happen while interrupts are
60 * requested for that device, which is serialised against other
61 * insertions/removals from the array by the global i3c infrastructure.
62 * So, devs_lock protects against concurrent updates to devs->ibi_dev
63 * between request_ibi/free_ibi and the IBI irq event.
65 struct dw_i3c_dat_entry devs[DW_I3C_MAX_DEVS];
68 /* platform-specific data */
69 const struct dw_i3c_platform_ops *platform_ops;
71 struct work_struct hj_work;
74 struct dw_i3c_platform_ops {
76 * Called on early bus init: the i3c has been set up, but before any
77 * transactions have taken place. Platform implementations may use to
78 * perform actual device enabling with the i3c core ready.
80 int (*init)(struct dw_i3c_master *i3c);
83 * Initialise a DAT entry to enable/disable IBIs. Allows the platform
84 * to perform any device workarounds on the DAT entry before
85 * inserting into the hardware table.
87 * Called with the DAT lock held; must not sleep.
89 void (*set_dat_ibi)(struct dw_i3c_master *i3c,
90 struct i3c_dev_desc *dev, bool enable, u32 *reg);
93 extern int dw_i3c_common_probe(struct dw_i3c_master *master,
94 struct platform_device *pdev);
95 extern void dw_i3c_common_remove(struct dw_i3c_master *master);