// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2021 Linaro Ltd
* Author: Ulf Hansson <ulf.hansson@linaro.org>
*
* Copyright (C) 2014 Intel Corp, All Rights Reserved.
* Author: Yi Sun <yi.y.sun@intel.com>
*
* Copyright (C) 2020 Genesys Logic, Inc.
* Authors: Ben Chuang <ben.chuang@genesyslogic.com.tw>
*
* Copyright (C) 2020 Linaro Limited
* Author: AKASHI Takahiro <takahiro.akashi@linaro.org>
*
* Copyright (C) 2022 Genesys Logic, Inc.
* Authors: Jason Lai <jason.lai@genesyslogic.com.tw>
*
* Copyright (C) 2023 Genesys Logic, Inc.
* Authors: Victor Shih <victor.shih@genesyslogic.com.tw>
*
* Support for SD UHS-II cards
*/
#include <linux/err.h>
#include <linux/pm_runtime.h>
#include <linux/mmc/host.h>
#include <linux/mmc/card.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/sd.h>
#include <linux/mmc/sd_uhs2.h>
#include "card.h"
#include "core.h"
#include "bus.h"
#include "sd.h"
#include "sd_ops.h"
#include "mmc_ops.h"
#define UHS2_WAIT_CFG_COMPLETE_PERIOD_US (1 * 1000)
#define UHS2_WAIT_CFG_COMPLETE_TIMEOUT_MS 100
static const unsigned int sd_uhs2_freqs[] = { 52000000, 26000000 };
struct sd_uhs2_wait_active_state_data {
struct mmc_host *host;
struct mmc_command *cmd;
};
static int sd_uhs2_power_up(struct mmc_host *host)
{
if (host->ios.power_mode == MMC_POWER_ON)
return 0;
host->ios.vdd = fls(host->ocr_avail) - 1;
host->ios.clock = host->f_init;
host->ios.timing = MMC_TIMING_UHS2_SPEED_A;
host->ios.power_mode = MMC_POWER_ON;
return host->ops->uhs2_control(host, UHS2_SET_IOS);
}
static int sd_uhs2_power_off(struct mmc_host *host)
{
int err;
if (host->ios.power_mode == MMC_POWER_OFF)
return 0;
host->ios.vdd = 0;
host->ios.clock = 0;
host->ios.power_mode = MMC_POWER_OFF;
host->uhs2_sd_tran = false;
err = host->ops->uhs2_control(host, UHS2_SET_IOS);
if (err)
return err;
/* For consistency, let's restore the initial timing. */
host->ios.timing = MMC_TIMING_LEGACY;
return 0;
}
/*
* Run the phy initialization sequence, which mainly relies on the UHS-II host
* to check that we reach the expected electrical state, between the host and
* the card.
*/
static int sd_uhs2_phy_init(struct mmc_host *host)
{
int err;
err = host->ops->uhs2_control(host, 