85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (c) 2023 Code Construct
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*
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* Author: Jeremy Kerr <jk@codeconstruct.com.au>
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*/
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#include <linux/clk.h>
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#include <linux/i3c/master.h>
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#include <linux/reset.h>
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#include <linux/types.h>
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#define DW_I3C_MAX_DEVS 32
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struct dw_i3c_master_caps {
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u8 cmdfifodepth;
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u8 datafifodepth;
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};
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struct dw_i3c_dat_entry {
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u8 addr;
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struct i3c_dev_desc *ibi_dev;
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};
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struct dw_i3c_master {
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struct i3c_master_controller base;
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u16 maxdevs;
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u16 datstartaddr;
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u32 free_pos;
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struct {
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struct list_head list;
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struct dw_i3c_xfer *cur;
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spinlock_t lock;
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} xferqueue;
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struct dw_i3c_master_caps caps;
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void __iomem *regs;
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struct reset_control *core_rst;
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struct clk *core_clk;
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char version[5];
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char type[5];
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bool ibi_capable;
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/*
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* Per-device hardware data, used to manage the device address table
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* (DAT)
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*
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* Locking: the devs array may be referenced in IRQ context while
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* processing an IBI. However, IBIs (for a specific device, which
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* implies a specific DAT entry) can only happen while interrupts are
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* requested for that device, which is serialised against other
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* insertions/removals from the array by the global i3c infrastructure.
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* So, devs_lock protects against concurrent updates to devs->ibi_dev
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* between request_ibi/free_ibi and the IBI irq event.
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*/
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struct dw_i3c_dat_entry devs[DW_I3C_MAX_DEVS];
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spinlock_t devs_lock;
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/* platform-specific data */
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const struct dw_i3c_platform_ops *platform_ops;
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};
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struct dw_i3c_platform_ops {
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/*
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* Called on early bus init: the i3c has been set up, but before any
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* transactions have taken place. Platform implementations may use to
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* perform actual device enabling with the i3c core ready.
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*/
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int (*init)(struct dw_i3c_master *i3c);
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/*
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* Initialise a DAT entry to enable/disable IBIs. Allows the platform
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* to perform any device workarounds on the DAT entry before
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* inserting into the hardware table.
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*
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* Called with the DAT lock held; must not sleep.
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*/
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void (*set_dat_ibi)(struct dw_i3c_master *i3c,
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struct i3c_dev_desc *dev, bool enable, u32 *reg);
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};
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extern int dw_i3c_common_probe(struct dw_i3c_master *master,
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struct platform_device *pdev);
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extern void dw_i3c_common_remove(struct dw_i3c_master *master);
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