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/* 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 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);
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