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![Helmut Grohne](/assets/img/avatar_default.png)
Some controllers immediately report SDHCI_CLOCK_INT_STABLE after enabling the clock even when the clock is not stable. When used in conjunction with older/slower cards, this can result in: mmc0: error -84 whilst initialising SD card When the stable reporting is known to be broken, we simply wait for the maximum stabilization period. Signed-off-by: Helmut Grohne <h.grohne@intenta.de> Acked-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
877 lines
25 KiB
C
877 lines
25 KiB
C
/*
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* Arasan Secure Digital Host Controller Interface.
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* Copyright (C) 2011 - 2012 Michal Simek <monstr@monstr.eu>
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* Copyright (c) 2012 Wind River Systems, Inc.
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* Copyright (C) 2013 Pengutronix e.K.
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* Copyright (C) 2013 Xilinx Inc.
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*
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* Based on sdhci-of-esdhc.c
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*
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* Copyright (c) 2007 Freescale Semiconductor, Inc.
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* Copyright (c) 2009 MontaVista Software, Inc.
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*
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* Authors: Xiaobo Xie <X.Xie@freescale.com>
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* Anton Vorontsov <avorontsov@ru.mvista.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*/
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#include <linux/clk-provider.h>
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#include <linux/mfd/syscon.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/phy/phy.h>
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#include <linux/regmap.h>
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#include <linux/of.h>
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#include "cqhci.h"
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#include "sdhci-pltfm.h"
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#define SDHCI_ARASAN_VENDOR_REGISTER 0x78
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#define SDHCI_ARASAN_CQE_BASE_ADDR 0x200
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#define VENDOR_ENHANCED_STROBE BIT(0)
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#define PHY_CLK_TOO_SLOW_HZ 400000
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/*
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* On some SoCs the syscon area has a feature where the upper 16-bits of
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* each 32-bit register act as a write mask for the lower 16-bits. This allows
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* atomic updates of the register without locking. This macro is used on SoCs
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* that have that feature.
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*/
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#define HIWORD_UPDATE(val, mask, shift) \
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((val) << (shift) | (mask) << ((shift) + 16))
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/**
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* struct sdhci_arasan_soc_ctl_field - Field used in sdhci_arasan_soc_ctl_map
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*
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* @reg: Offset within the syscon of the register containing this field
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* @width: Number of bits for this field
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* @shift: Bit offset within @reg of this field (or -1 if not avail)
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*/
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struct sdhci_arasan_soc_ctl_field {
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u32 reg;
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u16 width;
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s16 shift;
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};
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/**
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* struct sdhci_arasan_soc_ctl_map - Map in syscon to corecfg registers
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*
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* It's up to the licensee of the Arsan IP block to make these available
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* somewhere if needed. Presumably these will be scattered somewhere that's
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* accessible via the syscon API.
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*
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* @baseclkfreq: Where to find corecfg_baseclkfreq
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* @clockmultiplier: Where to find corecfg_clockmultiplier
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* @hiword_update: If true, use HIWORD_UPDATE to access the syscon
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*/
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struct sdhci_arasan_soc_ctl_map {
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struct sdhci_arasan_soc_ctl_field baseclkfreq;
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struct sdhci_arasan_soc_ctl_field clockmultiplier;
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bool hiword_update;
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};
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/**
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* struct sdhci_arasan_data
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* @host: Pointer to the main SDHCI host structure.
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* @clk_ahb: Pointer to the AHB clock
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* @phy: Pointer to the generic phy
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* @is_phy_on: True if the PHY is on; false if not.
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* @sdcardclk_hw: Struct for the clock we might provide to a PHY.
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* @sdcardclk: Pointer to normal 'struct clock' for sdcardclk_hw.
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* @soc_ctl_base: Pointer to regmap for syscon for soc_ctl registers.
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* @soc_ctl_map: Map to get offsets into soc_ctl registers.
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*/
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struct sdhci_arasan_data {
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struct sdhci_host *host;
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struct clk *clk_ahb;
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struct phy *phy;
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bool is_phy_on;
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bool has_cqe;
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struct clk_hw sdcardclk_hw;
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struct clk *sdcardclk;
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struct regmap *soc_ctl_base;
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const struct sdhci_arasan_soc_ctl_map *soc_ctl_map;
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unsigned int quirks; /* Arasan deviations from spec */
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/* Controller does not have CD wired and will not function normally without */
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#define SDHCI_ARASAN_QUIRK_FORCE_CDTEST BIT(0)
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/* Controller immediately reports SDHCI_CLOCK_INT_STABLE after enabling the
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* internal clock even when the clock isn't stable */
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#define SDHCI_ARASAN_QUIRK_CLOCK_UNSTABLE BIT(1)
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};
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static const struct sdhci_arasan_soc_ctl_map rk3399_soc_ctl_map = {
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.baseclkfreq = { .reg = 0xf000, .width = 8, .shift = 8 },
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.clockmultiplier = { .reg = 0xf02c, .width = 8, .shift = 0},
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.hiword_update = true,
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};
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/**
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* sdhci_arasan_syscon_write - Write to a field in soc_ctl registers
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*
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* This function allows writing to fields in sdhci_arasan_soc_ctl_map.
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* Note that if a field is specified as not available (shift < 0) then
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* this function will silently return an error code. It will be noisy
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* and print errors for any other (unexpected) errors.
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*
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* @host: The sdhci_host
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* @fld: The field to write to
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* @val: The value to write
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*/
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static int sdhci_arasan_syscon_write(struct sdhci_host *host,
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const struct sdhci_arasan_soc_ctl_field *fld,
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u32 val)
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{
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struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
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struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
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struct regmap *soc_ctl_base = sdhci_arasan->soc_ctl_base;
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u32 reg = fld->reg;
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u16 width = fld->width;
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s16 shift = fld->shift;
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int ret;
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/*
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* Silently return errors for shift < 0 so caller doesn't have
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* to check for fields which are optional. For fields that
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* are required then caller needs to do something special
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* anyway.
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*/
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if (shift < 0)
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return -EINVAL;
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if (sdhci_arasan->soc_ctl_map->hiword_update)
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ret = regmap_write(soc_ctl_base, reg,
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HIWORD_UPDATE(val, GENMASK(width, 0),
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shift));
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else
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ret = regmap_update_bits(soc_ctl_base, reg,
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GENMASK(shift + width, shift),
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val << shift);
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/* Yell about (unexpected) regmap errors */
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if (ret)
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pr_warn("%s: Regmap write fail: %d\n",
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mmc_hostname(host->mmc), ret);
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return ret;
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}
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static void sdhci_arasan_set_clock(struct sdhci_host *host, unsigned int clock)
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{
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struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
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struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
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bool ctrl_phy = false;
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if (!IS_ERR(sdhci_arasan->phy)) {
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if (!sdhci_arasan->is_phy_on && clock <= PHY_CLK_TOO_SLOW_HZ) {
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/*
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* If PHY off, set clock to max speed and power PHY on.
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*
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* Although PHY docs apparently suggest power cycling
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* when changing the clock the PHY doesn't like to be
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* powered on while at low speeds like those used in ID
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* mode. Even worse is powering the PHY on while the
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* clock is off.
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*
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* To workaround the PHY limitations, the best we can
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* do is to power it on at a faster speed and then slam
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* through low speeds without power cycling.
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*/
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sdhci_set_clock(host, host->max_clk);
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phy_power_on(sdhci_arasan->phy);
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sdhci_arasan->is_phy_on = true;
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/*
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* We'll now fall through to the below case with
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* ctrl_phy = false (so we won't turn off/on). The
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* sdhci_set_clock() will set the real clock.
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*/
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} else if (clock > PHY_CLK_TOO_SLOW_HZ) {
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/*
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* At higher clock speeds the PHY is fine being power
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* cycled and docs say you _should_ power cycle when
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* changing clock speeds.
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*/
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ctrl_phy = true;
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}
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}
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if (ctrl_phy && sdhci_arasan->is_phy_on) {
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phy_power_off(sdhci_arasan->phy);
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sdhci_arasan->is_phy_on = false;
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}
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sdhci_set_clock(host, clock);
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if (sdhci_arasan->quirks & SDHCI_ARASAN_QUIRK_CLOCK_UNSTABLE)
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/*
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* Some controllers immediately report SDHCI_CLOCK_INT_STABLE
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* after enabling the clock even though the clock is not
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* stable. Trying to use a clock without waiting here results
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* in EILSEQ while detecting some older/slower cards. The
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* chosen delay is the maximum delay from sdhci_set_clock.
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*/
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msleep(20);
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if (ctrl_phy) {
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phy_power_on(sdhci_arasan->phy);
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sdhci_arasan->is_phy_on = true;
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}
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}
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static void sdhci_arasan_hs400_enhanced_strobe(struct mmc_host *mmc,
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struct mmc_ios *ios)
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{
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u32 vendor;
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struct sdhci_host *host = mmc_priv(mmc);
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vendor = sdhci_readl(host, SDHCI_ARASAN_VENDOR_REGISTER);
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if (ios->enhanced_strobe)
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vendor |= VENDOR_ENHANCED_STROBE;
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else
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vendor &= ~VENDOR_ENHANCED_STROBE;
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sdhci_writel(host, vendor, SDHCI_ARASAN_VENDOR_REGISTER);
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}
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static void sdhci_arasan_reset(struct sdhci_host *host, u8 mask)
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{
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u8 ctrl;
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struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
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struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
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sdhci_reset(host, mask);
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if (sdhci_arasan->quirks & SDHCI_ARASAN_QUIRK_FORCE_CDTEST) {
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ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
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ctrl |= SDHCI_CTRL_CDTEST_INS | SDHCI_CTRL_CDTEST_EN;
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sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
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}
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}
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static int sdhci_arasan_voltage_switch(struct mmc_host *mmc,
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struct mmc_ios *ios)
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{
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switch (ios->signal_voltage) {
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case MMC_SIGNAL_VOLTAGE_180:
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/*
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* Plese don't switch to 1V8 as arasan,5.1 doesn't
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* actually refer to this setting to indicate the
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* signal voltage and the state machine will be broken
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* actually if we force to enable 1V8. That's something
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* like broken quirk but we could work around here.
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*/
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return 0;
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case MMC_SIGNAL_VOLTAGE_330:
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case MMC_SIGNAL_VOLTAGE_120:
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/* We don't support 3V3 and 1V2 */
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break;
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}
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return -EINVAL;
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}
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static void sdhci_arasan_set_power(struct sdhci_host *host, unsigned char mode,
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unsigned short vdd)
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{
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if (!IS_ERR(host->mmc->supply.vmmc)) {
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struct mmc_host *mmc = host->mmc;
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mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
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}
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sdhci_set_power_noreg(host, mode, vdd);
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}
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static const struct sdhci_ops sdhci_arasan_ops = {
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.set_clock = sdhci_arasan_set_clock,
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.get_max_clock = sdhci_pltfm_clk_get_max_clock,
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.get_timeout_clock = sdhci_pltfm_clk_get_max_clock,
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.set_bus_width = sdhci_set_bus_width,
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.reset = sdhci_arasan_reset,
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.set_uhs_signaling = sdhci_set_uhs_signaling,
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.set_power = sdhci_arasan_set_power,
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};
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static const struct sdhci_pltfm_data sdhci_arasan_pdata = {
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.ops = &sdhci_arasan_ops,
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.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
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.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
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SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN |
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SDHCI_QUIRK2_STOP_WITH_TC,
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};
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static u32 sdhci_arasan_cqhci_irq(struct sdhci_host *host, u32 intmask)
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{
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int cmd_error = 0;
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int data_error = 0;
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if (!sdhci_cqe_irq(host, intmask, &cmd_error, &data_error))
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return intmask;
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cqhci_irq(host->mmc, intmask, cmd_error, data_error);
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return 0;
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}
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static void sdhci_arasan_dumpregs(struct mmc_host *mmc)
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{
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sdhci_dumpregs(mmc_priv(mmc));
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}
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static void sdhci_arasan_cqe_enable(struct mmc_host *mmc)
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{
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struct sdhci_host *host = mmc_priv(mmc);
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u32 reg;
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reg = sdhci_readl(host, SDHCI_PRESENT_STATE);
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while (reg & SDHCI_DATA_AVAILABLE) {
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sdhci_readl(host, SDHCI_BUFFER);
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reg = sdhci_readl(host, SDHCI_PRESENT_STATE);
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}
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sdhci_cqe_enable(mmc);
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}
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static const struct cqhci_host_ops sdhci_arasan_cqhci_ops = {
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.enable = sdhci_arasan_cqe_enable,
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.disable = sdhci_cqe_disable,
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.dumpregs = sdhci_arasan_dumpregs,
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};
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static const struct sdhci_ops sdhci_arasan_cqe_ops = {
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.set_clock = sdhci_arasan_set_clock,
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.get_max_clock = sdhci_pltfm_clk_get_max_clock,
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.get_timeout_clock = sdhci_pltfm_clk_get_max_clock,
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.set_bus_width = sdhci_set_bus_width,
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.reset = sdhci_arasan_reset,
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.set_uhs_signaling = sdhci_set_uhs_signaling,
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.set_power = sdhci_arasan_set_power,
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.irq = sdhci_arasan_cqhci_irq,
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};
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static const struct sdhci_pltfm_data sdhci_arasan_cqe_pdata = {
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.ops = &sdhci_arasan_cqe_ops,
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.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
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.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
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SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN,
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};
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#ifdef CONFIG_PM_SLEEP
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/**
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* sdhci_arasan_suspend - Suspend method for the driver
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* @dev: Address of the device structure
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* Returns 0 on success and error value on error
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*
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* Put the device in a low power state.
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*/
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static int sdhci_arasan_suspend(struct device *dev)
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{
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struct sdhci_host *host = dev_get_drvdata(dev);
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struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
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struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
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int ret;
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if (host->tuning_mode != SDHCI_TUNING_MODE_3)
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mmc_retune_needed(host->mmc);
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if (sdhci_arasan->has_cqe) {
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ret = cqhci_suspend(host->mmc);
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if (ret)
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return ret;
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}
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ret = sdhci_suspend_host(host);
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if (ret)
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return ret;
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if (!IS_ERR(sdhci_arasan->phy) && sdhci_arasan->is_phy_on) {
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ret = phy_power_off(sdhci_arasan->phy);
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if (ret) {
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dev_err(dev, "Cannot power off phy.\n");
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sdhci_resume_host(host);
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return ret;
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}
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sdhci_arasan->is_phy_on = false;
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}
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clk_disable(pltfm_host->clk);
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clk_disable(sdhci_arasan->clk_ahb);
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return 0;
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}
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/**
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* sdhci_arasan_resume - Resume method for the driver
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* @dev: Address of the device structure
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* Returns 0 on success and error value on error
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*
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* Resume operation after suspend
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*/
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static int sdhci_arasan_resume(struct device *dev)
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{
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struct sdhci_host *host = dev_get_drvdata(dev);
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struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
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struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
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int ret;
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ret = clk_enable(sdhci_arasan->clk_ahb);
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if (ret) {
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dev_err(dev, "Cannot enable AHB clock.\n");
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return ret;
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}
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ret = clk_enable(pltfm_host->clk);
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if (ret) {
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dev_err(dev, "Cannot enable SD clock.\n");
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return ret;
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}
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if (!IS_ERR(sdhci_arasan->phy) && host->mmc->actual_clock) {
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ret = phy_power_on(sdhci_arasan->phy);
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if (ret) {
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dev_err(dev, "Cannot power on phy.\n");
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return ret;
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}
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sdhci_arasan->is_phy_on = true;
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}
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ret = sdhci_resume_host(host);
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if (ret) {
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dev_err(dev, "Cannot resume host.\n");
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return ret;
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}
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if (sdhci_arasan->has_cqe)
|
|
return cqhci_resume(host->mmc);
|
|
|
|
return 0;
|
|
}
|
|
#endif /* ! CONFIG_PM_SLEEP */
|
|
|
|
static SIMPLE_DEV_PM_OPS(sdhci_arasan_dev_pm_ops, sdhci_arasan_suspend,
|
|
sdhci_arasan_resume);
|
|
|
|
static const struct of_device_id sdhci_arasan_of_match[] = {
|
|
/* SoC-specific compatible strings w/ soc_ctl_map */
|
|
{
|
|
.compatible = "rockchip,rk3399-sdhci-5.1",
|
|
.data = &rk3399_soc_ctl_map,
|
|
},
|
|
|
|
/* Generic compatible below here */
|
|
{ .compatible = "arasan,sdhci-8.9a" },
|
|
{ .compatible = "arasan,sdhci-5.1" },
|
|
{ .compatible = "arasan,sdhci-4.9a" },
|
|
|
|
{ /* sentinel */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, sdhci_arasan_of_match);
|
|
|
|
/**
|
|
* sdhci_arasan_sdcardclk_recalc_rate - Return the card clock rate
|
|
*
|
|
* Return the current actual rate of the SD card clock. This can be used
|
|
* to communicate with out PHY.
|
|
*
|
|
* @hw: Pointer to the hardware clock structure.
|
|
* @parent_rate The parent rate (should be rate of clk_xin).
|
|
* Returns the card clock rate.
|
|
*/
|
|
static unsigned long sdhci_arasan_sdcardclk_recalc_rate(struct clk_hw *hw,
|
|
unsigned long parent_rate)
|
|
|
|
{
|
|
struct sdhci_arasan_data *sdhci_arasan =
|
|
container_of(hw, struct sdhci_arasan_data, sdcardclk_hw);
|
|
struct sdhci_host *host = sdhci_arasan->host;
|
|
|
|
return host->mmc->actual_clock;
|
|
}
|
|
|
|
static const struct clk_ops arasan_sdcardclk_ops = {
|
|
.recalc_rate = sdhci_arasan_sdcardclk_recalc_rate,
|
|
};
|
|
|
|
/**
|
|
* sdhci_arasan_update_clockmultiplier - Set corecfg_clockmultiplier
|
|
*
|
|
* The corecfg_clockmultiplier is supposed to contain clock multiplier
|
|
* value of programmable clock generator.
|
|
*
|
|
* NOTES:
|
|
* - Many existing devices don't seem to do this and work fine. To keep
|
|
* compatibility for old hardware where the device tree doesn't provide a
|
|
* register map, this function is a noop if a soc_ctl_map hasn't been provided
|
|
* for this platform.
|
|
* - The value of corecfg_clockmultiplier should sync with that of corresponding
|
|
* value reading from sdhci_capability_register. So this function is called
|
|
* once at probe time and never called again.
|
|
*
|
|
* @host: The sdhci_host
|
|
*/
|
|
static void sdhci_arasan_update_clockmultiplier(struct sdhci_host *host,
|
|
u32 value)
|
|
{
|
|
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
|
|
struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
|
|
const struct sdhci_arasan_soc_ctl_map *soc_ctl_map =
|
|
sdhci_arasan->soc_ctl_map;
|
|
|
|
/* Having a map is optional */
|
|
if (!soc_ctl_map)
|
|
return;
|
|
|
|
/* If we have a map, we expect to have a syscon */
|
|
if (!sdhci_arasan->soc_ctl_base) {
|
|
pr_warn("%s: Have regmap, but no soc-ctl-syscon\n",
|
|
mmc_hostname(host->mmc));
|
|
return;
|
|
}
|
|
|
|
sdhci_arasan_syscon_write(host, &soc_ctl_map->clockmultiplier, value);
|
|
}
|
|
|
|
/**
|
|
* sdhci_arasan_update_baseclkfreq - Set corecfg_baseclkfreq
|
|
*
|
|
* The corecfg_baseclkfreq is supposed to contain the MHz of clk_xin. This
|
|
* function can be used to make that happen.
|
|
*
|
|
* NOTES:
|
|
* - Many existing devices don't seem to do this and work fine. To keep
|
|
* compatibility for old hardware where the device tree doesn't provide a
|
|
* register map, this function is a noop if a soc_ctl_map hasn't been provided
|
|
* for this platform.
|
|
* - It's assumed that clk_xin is not dynamic and that we use the SDHCI divider
|
|
* to achieve lower clock rates. That means that this function is called once
|
|
* at probe time and never called again.
|
|
*
|
|
* @host: The sdhci_host
|
|
*/
|
|
static void sdhci_arasan_update_baseclkfreq(struct sdhci_host *host)
|
|
{
|
|
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
|
|
struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
|
|
const struct sdhci_arasan_soc_ctl_map *soc_ctl_map =
|
|
sdhci_arasan->soc_ctl_map;
|
|
u32 mhz = DIV_ROUND_CLOSEST(clk_get_rate(pltfm_host->clk), 1000000);
|
|
|
|
/* Having a map is optional */
|
|
if (!soc_ctl_map)
|
|
return;
|
|
|
|
/* If we have a map, we expect to have a syscon */
|
|
if (!sdhci_arasan->soc_ctl_base) {
|
|
pr_warn("%s: Have regmap, but no soc-ctl-syscon\n",
|
|
mmc_hostname(host->mmc));
|
|
return;
|
|
}
|
|
|
|
sdhci_arasan_syscon_write(host, &soc_ctl_map->baseclkfreq, mhz);
|
|
}
|
|
|
|
/**
|
|
* sdhci_arasan_register_sdclk - Register the sdclk for a PHY to use
|
|
*
|
|
* Some PHY devices need to know what the actual card clock is. In order for
|
|
* them to find out, we'll provide a clock through the common clock framework
|
|
* for them to query.
|
|
*
|
|
* Note: without seriously re-architecting SDHCI's clock code and testing on
|
|
* all platforms, there's no way to create a totally beautiful clock here
|
|
* with all clock ops implemented. Instead, we'll just create a clock that can
|
|
* be queried and set the CLK_GET_RATE_NOCACHE attribute to tell common clock
|
|
* framework that we're doing things behind its back. This should be sufficient
|
|
* to create nice clean device tree bindings and later (if needed) we can try
|
|
* re-architecting SDHCI if we see some benefit to it.
|
|
*
|
|
* @sdhci_arasan: Our private data structure.
|
|
* @clk_xin: Pointer to the functional clock
|
|
* @dev: Pointer to our struct device.
|
|
* Returns 0 on success and error value on error
|
|
*/
|
|
static int sdhci_arasan_register_sdclk(struct sdhci_arasan_data *sdhci_arasan,
|
|
struct clk *clk_xin,
|
|
struct device *dev)
|
|
{
|
|
struct device_node *np = dev->of_node;
|
|
struct clk_init_data sdcardclk_init;
|
|
const char *parent_clk_name;
|
|
int ret;
|
|
|
|
/* Providing a clock to the PHY is optional; no error if missing */
|
|
if (!of_find_property(np, "#clock-cells", NULL))
|
|
return 0;
|
|
|
|
ret = of_property_read_string_index(np, "clock-output-names", 0,
|
|
&sdcardclk_init.name);
|
|
if (ret) {
|
|
dev_err(dev, "DT has #clock-cells but no clock-output-names\n");
|
|
return ret;
|
|
}
|
|
|
|
parent_clk_name = __clk_get_name(clk_xin);
|
|
sdcardclk_init.parent_names = &parent_clk_name;
|
|
sdcardclk_init.num_parents = 1;
|
|
sdcardclk_init.flags = CLK_GET_RATE_NOCACHE;
|
|
sdcardclk_init.ops = &arasan_sdcardclk_ops;
|
|
|
|
sdhci_arasan->sdcardclk_hw.init = &sdcardclk_init;
|
|
sdhci_arasan->sdcardclk =
|
|
devm_clk_register(dev, &sdhci_arasan->sdcardclk_hw);
|
|
sdhci_arasan->sdcardclk_hw.init = NULL;
|
|
|
|
ret = of_clk_add_provider(np, of_clk_src_simple_get,
|
|
sdhci_arasan->sdcardclk);
|
|
if (ret)
|
|
dev_err(dev, "Failed to add clock provider\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* sdhci_arasan_unregister_sdclk - Undoes sdhci_arasan_register_sdclk()
|
|
*
|
|
* Should be called any time we're exiting and sdhci_arasan_register_sdclk()
|
|
* returned success.
|
|
*
|
|
* @dev: Pointer to our struct device.
|
|
*/
|
|
static void sdhci_arasan_unregister_sdclk(struct device *dev)
|
|
{
|
|
struct device_node *np = dev->of_node;
|
|
|
|
if (!of_find_property(np, "#clock-cells", NULL))
|
|
return;
|
|
|
|
of_clk_del_provider(dev->of_node);
|
|
}
|
|
|
|
static int sdhci_arasan_add_host(struct sdhci_arasan_data *sdhci_arasan)
|
|
{
|
|
struct sdhci_host *host = sdhci_arasan->host;
|
|
struct cqhci_host *cq_host;
|
|
bool dma64;
|
|
int ret;
|
|
|
|
if (!sdhci_arasan->has_cqe)
|
|
return sdhci_add_host(host);
|
|
|
|
ret = sdhci_setup_host(host);
|
|
if (ret)
|
|
return ret;
|
|
|
|
cq_host = devm_kzalloc(host->mmc->parent,
|
|
sizeof(*cq_host), GFP_KERNEL);
|
|
if (!cq_host) {
|
|
ret = -ENOMEM;
|
|
goto cleanup;
|
|
}
|
|
|
|
cq_host->mmio = host->ioaddr + SDHCI_ARASAN_CQE_BASE_ADDR;
|
|
cq_host->ops = &sdhci_arasan_cqhci_ops;
|
|
|
|
dma64 = host->flags & SDHCI_USE_64_BIT_DMA;
|
|
if (dma64)
|
|
cq_host->caps |= CQHCI_TASK_DESC_SZ_128;
|
|
|
|
ret = cqhci_init(cq_host, host->mmc, dma64);
|
|
if (ret)
|
|
goto cleanup;
|
|
|
|
ret = __sdhci_add_host(host);
|
|
if (ret)
|
|
goto cleanup;
|
|
|
|
return 0;
|
|
|
|
cleanup:
|
|
sdhci_cleanup_host(host);
|
|
return ret;
|
|
}
|
|
|
|
static int sdhci_arasan_probe(struct platform_device *pdev)
|
|
{
|
|
int ret;
|
|
const struct of_device_id *match;
|
|
struct device_node *node;
|
|
struct clk *clk_xin;
|
|
struct sdhci_host *host;
|
|
struct sdhci_pltfm_host *pltfm_host;
|
|
struct sdhci_arasan_data *sdhci_arasan;
|
|
struct device_node *np = pdev->dev.of_node;
|
|
const struct sdhci_pltfm_data *pdata;
|
|
|
|
if (of_device_is_compatible(pdev->dev.of_node, "arasan,sdhci-5.1"))
|
|
pdata = &sdhci_arasan_cqe_pdata;
|
|
else
|
|
pdata = &sdhci_arasan_pdata;
|
|
|
|
host = sdhci_pltfm_init(pdev, pdata, sizeof(*sdhci_arasan));
|
|
|
|
if (IS_ERR(host))
|
|
return PTR_ERR(host);
|
|
|
|
pltfm_host = sdhci_priv(host);
|
|
sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
|
|
sdhci_arasan->host = host;
|
|
|
|
match = of_match_node(sdhci_arasan_of_match, pdev->dev.of_node);
|
|
sdhci_arasan->soc_ctl_map = match->data;
|
|
|
|
node = of_parse_phandle(pdev->dev.of_node, "arasan,soc-ctl-syscon", 0);
|
|
if (node) {
|
|
sdhci_arasan->soc_ctl_base = syscon_node_to_regmap(node);
|
|
of_node_put(node);
|
|
|
|
if (IS_ERR(sdhci_arasan->soc_ctl_base)) {
|
|
ret = PTR_ERR(sdhci_arasan->soc_ctl_base);
|
|
if (ret != -EPROBE_DEFER)
|
|
dev_err(&pdev->dev, "Can't get syscon: %d\n",
|
|
ret);
|
|
goto err_pltfm_free;
|
|
}
|
|
}
|
|
|
|
sdhci_arasan->clk_ahb = devm_clk_get(&pdev->dev, "clk_ahb");
|
|
if (IS_ERR(sdhci_arasan->clk_ahb)) {
|
|
dev_err(&pdev->dev, "clk_ahb clock not found.\n");
|
|
ret = PTR_ERR(sdhci_arasan->clk_ahb);
|
|
goto err_pltfm_free;
|
|
}
|
|
|
|
clk_xin = devm_clk_get(&pdev->dev, "clk_xin");
|
|
if (IS_ERR(clk_xin)) {
|
|
dev_err(&pdev->dev, "clk_xin clock not found.\n");
|
|
ret = PTR_ERR(clk_xin);
|
|
goto err_pltfm_free;
|
|
}
|
|
|
|
ret = clk_prepare_enable(sdhci_arasan->clk_ahb);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Unable to enable AHB clock.\n");
|
|
goto err_pltfm_free;
|
|
}
|
|
|
|
ret = clk_prepare_enable(clk_xin);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Unable to enable SD clock.\n");
|
|
goto clk_dis_ahb;
|
|
}
|
|
|
|
sdhci_get_of_property(pdev);
|
|
|
|
if (of_property_read_bool(np, "xlnx,fails-without-test-cd"))
|
|
sdhci_arasan->quirks |= SDHCI_ARASAN_QUIRK_FORCE_CDTEST;
|
|
|
|
if (of_property_read_bool(np, "xlnx,int-clock-stable-broken"))
|
|
sdhci_arasan->quirks |= SDHCI_ARASAN_QUIRK_CLOCK_UNSTABLE;
|
|
|
|
pltfm_host->clk = clk_xin;
|
|
|
|
if (of_device_is_compatible(pdev->dev.of_node,
|
|
"rockchip,rk3399-sdhci-5.1"))
|
|
sdhci_arasan_update_clockmultiplier(host, 0x0);
|
|
|
|
sdhci_arasan_update_baseclkfreq(host);
|
|
|
|
ret = sdhci_arasan_register_sdclk(sdhci_arasan, clk_xin, &pdev->dev);
|
|
if (ret)
|
|
goto clk_disable_all;
|
|
|
|
ret = mmc_of_parse(host->mmc);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "parsing dt failed (%d)\n", ret);
|
|
goto unreg_clk;
|
|
}
|
|
|
|
sdhci_arasan->phy = ERR_PTR(-ENODEV);
|
|
if (of_device_is_compatible(pdev->dev.of_node,
|
|
"arasan,sdhci-5.1")) {
|
|
sdhci_arasan->phy = devm_phy_get(&pdev->dev,
|
|
"phy_arasan");
|
|
if (IS_ERR(sdhci_arasan->phy)) {
|
|
ret = PTR_ERR(sdhci_arasan->phy);
|
|
dev_err(&pdev->dev, "No phy for arasan,sdhci-5.1.\n");
|
|
goto unreg_clk;
|
|
}
|
|
|
|
ret = phy_init(sdhci_arasan->phy);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "phy_init err.\n");
|
|
goto unreg_clk;
|
|
}
|
|
|
|
host->mmc_host_ops.hs400_enhanced_strobe =
|
|
sdhci_arasan_hs400_enhanced_strobe;
|
|
host->mmc_host_ops.start_signal_voltage_switch =
|
|
sdhci_arasan_voltage_switch;
|
|
sdhci_arasan->has_cqe = true;
|
|
host->mmc->caps2 |= MMC_CAP2_CQE | MMC_CAP2_CQE_DCMD;
|
|
}
|
|
|
|
ret = sdhci_arasan_add_host(sdhci_arasan);
|
|
if (ret)
|
|
goto err_add_host;
|
|
|
|
return 0;
|
|
|
|
err_add_host:
|
|
if (!IS_ERR(sdhci_arasan->phy))
|
|
phy_exit(sdhci_arasan->phy);
|
|
unreg_clk:
|
|
sdhci_arasan_unregister_sdclk(&pdev->dev);
|
|
clk_disable_all:
|
|
clk_disable_unprepare(clk_xin);
|
|
clk_dis_ahb:
|
|
clk_disable_unprepare(sdhci_arasan->clk_ahb);
|
|
err_pltfm_free:
|
|
sdhci_pltfm_free(pdev);
|
|
return ret;
|
|
}
|
|
|
|
static int sdhci_arasan_remove(struct platform_device *pdev)
|
|
{
|
|
int ret;
|
|
struct sdhci_host *host = platform_get_drvdata(pdev);
|
|
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
|
|
struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
|
|
struct clk *clk_ahb = sdhci_arasan->clk_ahb;
|
|
|
|
if (!IS_ERR(sdhci_arasan->phy)) {
|
|
if (sdhci_arasan->is_phy_on)
|
|
phy_power_off(sdhci_arasan->phy);
|
|
phy_exit(sdhci_arasan->phy);
|
|
}
|
|
|
|
sdhci_arasan_unregister_sdclk(&pdev->dev);
|
|
|
|
ret = sdhci_pltfm_unregister(pdev);
|
|
|
|
clk_disable_unprepare(clk_ahb);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct platform_driver sdhci_arasan_driver = {
|
|
.driver = {
|
|
.name = "sdhci-arasan",
|
|
.of_match_table = sdhci_arasan_of_match,
|
|
.pm = &sdhci_arasan_dev_pm_ops,
|
|
},
|
|
.probe = sdhci_arasan_probe,
|
|
.remove = sdhci_arasan_remove,
|
|
};
|
|
|
|
module_platform_driver(sdhci_arasan_driver);
|
|
|
|
MODULE_DESCRIPTION("Driver for the Arasan SDHCI Controller");
|
|
MODULE_AUTHOR("Soeren Brinkmann <soren.brinkmann@xilinx.com>");
|
|
MODULE_LICENSE("GPL");
|