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
i3c_hci_dct_get_val(struct i3c_hci * hci,unsigned int dct_idx,u64 * pid,unsigned int * dcr,unsigned int * bcr)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