37 lines · c
1// SPDX-License-Identifier: BSD-3-Clause2/*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 Table18 */19 20void 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