LXR linux/drivers/i3c/master/mipi-i3c-hci/dct

   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
  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