linux-imx

// SPDX-License-Identifier: GPL-2.0+

// Copyright IBM Corp 2019

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#include <linux/device.h>

#include <linux/errno.h>

#include <linux/fsi-occ.h>

#include <linux/i2c.h>

#include <linux/jiffies.h>

#include <linux/module.h>

#include <linux/sched.h>

#include <asm/unaligned.h>

​

#include "common.h"

​

#define OCC_TIMEOUT_MS          1000

#define OCC_CMD_IN_PRG_WAIT_MS      50

​

/* OCB (on-chip control bridge - interface to OCC) registers */

#define OCB_DATA1           0x6B035

#define OCB_ADDR            0x6B070

#define OCB_DATA3           0x6B075

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/* OCC SRAM address space */

#define OCC_SRAM_ADDR_CMD       0xFFFF6000

#define OCC_SRAM_ADDR_RESP      0xFFFF7000

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#define OCC_DATA_ATTN           0x20010000

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struct p8_i2c_occ {

    struct occ occ;

    struct i2c_client *client;

};

​

#define to_p8_i2c_occ(x)    container_of((x), struct p8_i2c_occ, occ)

​

static int p8_i2c_occ_getscom(struct i2c_client *client, u32 address, u8 *data)

{

    ssize_t rc;

    __be64 buf;

    struct i2c_msg msgs[2];

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    /* p8 i2c slave requires shift */

    address <<= 1;

​

    msgs[0].addr = client->addr;

    msgs[0].flags = client->flags & I2C_M_TEN;

    msgs[0].len = sizeof(u32);

    /* address is a scom address; bus-endian */

    msgs[0].buf = (char *)&address;

​

    /* data from OCC is big-endian */

    msgs[1].addr = client->addr;

    msgs[1].flags = (client->flags & I2C_M_TEN) | I2C_M_RD;

    msgs[1].len = sizeof(u64);

    msgs[1].buf = (char *)&buf;

​

    rc = i2c_transfer(client->adapter, msgs, 2);

    if (rc < 0)

        return rc;

​

    *(u64 *)data = be64_to_cpu(buf);

​

    return 0;