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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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bb16ea1742
On Armada 7K/8K we need to explicitly enable the bus clock. The bus clock
is optional because not all the SoCs need them but at least for Armada
7K/8K it is actually mandatory.
The binding documentation is updating accordingly.
Without this patch the kernel hand during boot if the mvpp2.2 network
driver was not present in the kernel. Indeed the clock needed by the
xenon controller was set by the network driver.
Fixes: 3a3748dba8 ("mmc: sdhci-xenon: Add Marvell Xenon SDHC core
functionality)"
CC: Stable <stable@vger.kernel.org>
Tested-by: Zhoujie Wu <zjwu@marvell.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
104 lines
2.9 KiB
C
104 lines
2.9 KiB
C
/*
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* Copyright (C) 2016 Marvell, All Rights Reserved.
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*
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* Author: Hu Ziji <huziji@marvell.com>
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* Date: 2016-8-24
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.
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*/
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#ifndef SDHCI_XENON_H_
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#define SDHCI_XENON_H_
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/* Register Offset of Xenon SDHC self-defined register */
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#define XENON_SYS_CFG_INFO 0x0104
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#define XENON_SLOT_TYPE_SDIO_SHIFT 24
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#define XENON_NR_SUPPORTED_SLOT_MASK 0x7
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#define XENON_SYS_OP_CTRL 0x0108
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#define XENON_AUTO_CLKGATE_DISABLE_MASK BIT(20)
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#define XENON_SDCLK_IDLEOFF_ENABLE_SHIFT 8
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#define XENON_SLOT_ENABLE_SHIFT 0
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#define XENON_SYS_EXT_OP_CTRL 0x010C
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#define XENON_MASK_CMD_CONFLICT_ERR BIT(8)
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#define XENON_SLOT_OP_STATUS_CTRL 0x0128
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#define XENON_TUN_CONSECUTIVE_TIMES_SHIFT 16
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#define XENON_TUN_CONSECUTIVE_TIMES_MASK 0x7
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#define XENON_TUN_CONSECUTIVE_TIMES 0x4
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#define XENON_TUNING_STEP_SHIFT 12
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#define XENON_TUNING_STEP_MASK 0xF
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#define XENON_TUNING_STEP_DIVIDER BIT(6)
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#define XENON_SLOT_EMMC_CTRL 0x0130
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#define XENON_ENABLE_RESP_STROBE BIT(25)
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#define XENON_ENABLE_DATA_STROBE BIT(24)
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#define XENON_SLOT_RETUNING_REQ_CTRL 0x0144
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/* retuning compatible */
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#define XENON_RETUNING_COMPATIBLE 0x1
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#define XENON_SLOT_EXT_PRESENT_STATE 0x014C
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#define XENON_DLL_LOCK_STATE 0x1
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#define XENON_SLOT_DLL_CUR_DLY_VAL 0x0150
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/* Tuning Parameter */
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#define XENON_TMR_RETUN_NO_PRESENT 0xF
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#define XENON_DEF_TUNING_COUNT 0x9
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#define XENON_DEFAULT_SDCLK_FREQ 400000
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#define XENON_LOWEST_SDCLK_FREQ 100000
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/* Xenon specific Mode Select value */
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#define XENON_CTRL_HS200 0x5
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#define XENON_CTRL_HS400 0x6
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struct xenon_priv {
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unsigned char tuning_count;
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/* idx of SDHC */
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u8 sdhc_id;
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/*
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* eMMC/SD/SDIO require different register settings.
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* Xenon driver has to recognize card type
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* before mmc_host->card is not available.
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* This field records the card type during init.
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* It is updated in xenon_init_card().
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*
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* It is only valid during initialization after it is updated.
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* Do not access this variable in normal transfers after
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* initialization completes.
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*/
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unsigned int init_card_type;
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/*
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* The bus_width, timing, and clock fields in below
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* record the current ios setting of Xenon SDHC.
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* Driver will adjust PHY setting if any change to
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* ios affects PHY timing.
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*/
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unsigned char bus_width;
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unsigned char timing;
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unsigned int clock;
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struct clk *axi_clk;
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int phy_type;
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/*
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* Contains board-specific PHY parameters
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* passed from device tree.
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*/
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void *phy_params;
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struct xenon_emmc_phy_regs *emmc_phy_regs;
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bool restore_needed;
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};
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int xenon_phy_adj(struct sdhci_host *host, struct mmc_ios *ios);
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int xenon_phy_parse_dt(struct device_node *np,
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struct sdhci_host *host);
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void xenon_soc_pad_ctrl(struct sdhci_host *host,
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unsigned char signal_voltage);
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#endif
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