1 // SPDX-License-Identifier: BSD-3-Clause
2 /*
3  * Copyright (c) 2020, MIPI Alliance, Inc.
4  *
5  * Author: Nicolas Pitre <npitre@baylibre.com>
6  */
7 
8 #include <linux/device.h>
9 #include <linux/bitfield.h>
10 #include <linux/i3c/master.h>
11 #include <linux/io.h>
12 
13 #include "hci.h"
14 #include "dct.h"
15 
16 /*
17  * Device Characteristic Table
18  */
19 
20 void i3c_hci_dct_get_val(struct i3c_hci *hci, unsigned int dct_idx,
21 			 u64 *pid, unsigned int *dcr, unsigned int *bcr)
22 {
23 	void __iomem *reg = hci->DCT_regs + dct_idx * 4 * 4;
24 	u32 dct_entry_data[4];
25 	unsigned int i;
26 
27 	for (i = 0; i < 4; i++) {
28 		dct_entry_data[i] = readl(reg);
29 		reg += 4;
30 	}
31 
32 	*pid = ((u64)dct_entry_data[0]) << (47 - 32 + 1) |
33 	       FIELD_GET(W1_MASK(47, 32), dct_entry_data[1]);
34 	*dcr = FIELD_GET(W2_MASK(71, 64), dct_entry_data[2]);
35 	*bcr = FIELD_GET(W2_MASK(79, 72), dct_entry_data[2]);
36 }
37