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mmc: sdhci-xenon: Add Marvell Xenon SDHC core functionality

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Add Xenon eMMC/SD/SDIO host controller core functionality.
Add Xenon specific initialization process.
Add Xenon specific mmc_host_ops APIs.
Add Xenon specific register definitions.

Add CONFIG_MMC_SDHCI_XENON support in drivers/mmc/host/Kconfig.

Marvell Xenon SDHC conforms to SD Physical Layer Specification
Version 3.01 and is designed according to the guidelines provided
in the SD Host Controller Standard Specification Version 3.00.

Signed-off-by: Hu Ziji <huziji@marvell.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Hu Ziji 2017-03-30 17:22:59 +02:00 committed by Ulf Hansson
parent 66c659cf5c
commit 3a3748dba8
4 changed files with 612 additions and 0 deletions
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8
drivers/mmc/host/Kconfig
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@ -853,3 +853,11 @@ config MMC_SDHCI_BRCMSTB
Broadcom STB SoCs.
If unsure, say Y.
config MMC_SDHCI_XENON
tristate "Marvell Xenon eMMC/SD/SDIO SDHCI driver"
depends on MMC_SDHCI_PLTFM
help
This selects Marvell Xenon eMMC/SD/SDIO SDHCI.
If you have a controller with this interface, say Y or M here.
If unsure, say N.

3
drivers/mmc/host/Makefile
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@ -86,3 +86,6 @@ obj-$(CONFIG_MMC_SDHCI_BRCMSTB) += sdhci-brcmstb.o
ifeq ($(CONFIG_CB710_DEBUG),y)
CFLAGS-cb710-mmc += -DDEBUG
endif
obj-$(CONFIG_MMC_SDHCI_XENON) += sdhci-xenon-driver.o
sdhci-xenon-driver-y += sdhci-xenon.o

541
drivers/mmc/host/sdhci-xenon.c Normal file
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@ -0,0 +1,541 @@
/*
* Driver for Marvell Xenon SDHC as a platform device
*
* Copyright (C) 2016 Marvell, All Rights Reserved.
*
* Author: Hu Ziji <huziji@marvell.com>
* Date: 2016-8-24
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation version 2.
*
* Inspired by Jisheng Zhang <jszhang@marvell.com>
* Special thanks to Video BG4 project team.
*/
#include <linux/delay.h>
#include <linux/ktime.h>
#include <linux/module.h>
#include <linux/of.h>
#include "sdhci-pltfm.h"
#include "sdhci-xenon.h"
static int xenon_enable_internal_clk(struct sdhci_host *host)
{
u32 reg;
ktime_t timeout;
reg = sdhci_readl(host, SDHCI_CLOCK_CONTROL);
reg |= SDHCI_CLOCK_INT_EN;
sdhci_writel(host, reg, SDHCI_CLOCK_CONTROL);
/* Wait max 20 ms */
timeout = ktime_add_ms(ktime_get(), 20);
while (!((reg = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
& SDHCI_CLOCK_INT_STABLE)) {
if (ktime_after(ktime_get(), timeout)) {
dev_err(mmc_dev(host->mmc), "Internal clock never stabilised.\n");
return -ETIMEDOUT;
}
usleep_range(900, 1100);
}
return 0;
}
/* Set SDCLK-off-while-idle */
static void xenon_set_sdclk_off_idle(struct sdhci_host *host,
unsigned char sdhc_id, bool enable)
{
u32 reg;
u32 mask;
reg = sdhci_readl(host, XENON_SYS_OP_CTRL);
/* Get the bit shift basing on the SDHC index */
mask = (0x1 << (XENON_SDCLK_IDLEOFF_ENABLE_SHIFT + sdhc_id));
if (enable)
reg |= mask;
else
reg &= ~mask;
sdhci_writel(host, reg, XENON_SYS_OP_CTRL);
}
/* Enable/Disable the Auto Clock Gating function */
static void xenon_set_acg(struct sdhci_host *host, bool enable)
{
u32 reg;
reg = sdhci_readl(host, XENON_SYS_OP_CTRL);
if (enable)
reg &= ~XENON_AUTO_CLKGATE_DISABLE_MASK;
else
reg |= XENON_AUTO_CLKGATE_DISABLE_MASK;
sdhci_writel(host, reg, XENON_SYS_OP_CTRL);
}
/* Enable this SDHC */
static void xenon_enable_sdhc(struct sdhci_host *host,
unsigned char sdhc_id)
{
u32 reg;
reg = sdhci_readl(host, XENON_SYS_OP_CTRL);
reg |= (BIT(sdhc_id) << XENON_SLOT_ENABLE_SHIFT);
sdhci_writel(host, reg, XENON_SYS_OP_CTRL);
host->mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY;
/*
* Force to clear BUS_TEST to
* skip bus_test_pre and bus_test_post
*/
host->mmc->caps &= ~MMC_CAP_BUS_WIDTH_TEST;
}
/* Disable this SDHC */
static void xenon_disable_sdhc(struct sdhci_host *host,
unsigned char sdhc_id)
{
u32 reg;
reg = sdhci_readl(host, XENON_SYS_OP_CTRL);
reg &= ~(BIT(sdhc_id) << XENON_SLOT_ENABLE_SHIFT);
sdhci_writel(host, reg, XENON_SYS_OP_CTRL);
}
/* Enable Parallel Transfer Mode */
static void xenon_enable_sdhc_parallel_tran(struct sdhci_host *host,
unsigned char sdhc_id)
{
u32 reg;
reg = sdhci_readl(host, XENON_SYS_EXT_OP_CTRL);
reg |= BIT(sdhc_id);
sdhci_writel(host, reg, XENON_SYS_EXT_OP_CTRL);
}
/* Mask command conflict error */
static void xenon_mask_cmd_conflict_err(struct sdhci_host *host)
{
u32 reg;
reg = sdhci_readl(host, XENON_SYS_EXT_OP_CTRL);
reg |= XENON_MASK_CMD_CONFLICT_ERR;
sdhci_writel(host, reg, XENON_SYS_EXT_OP_CTRL);
}
static void xenon_retune_setup(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
u32 reg;
/* Disable the Re-Tuning Request functionality */
reg = sdhci_readl(host, XENON_SLOT_RETUNING_REQ_CTRL);
reg &= ~XENON_RETUNING_COMPATIBLE;
sdhci_writel(host, reg, XENON_SLOT_RETUNING_REQ_CTRL);
/* Disable the Re-tuning Interrupt */
reg = sdhci_readl(host, SDHCI_SIGNAL_ENABLE);
reg &= ~SDHCI_INT_RETUNE;
sdhci_writel(host, reg, SDHCI_SIGNAL_ENABLE);
reg = sdhci_readl(host, SDHCI_INT_ENABLE);
reg &= ~SDHCI_INT_RETUNE;
sdhci_writel(host, reg, SDHCI_INT_ENABLE);
/* Force to use Tuning Mode 1 */
host->tuning_mode = SDHCI_TUNING_MODE_1;
/* Set re-tuning period */
host->tuning_count = 1 << (priv->tuning_count - 1);
}
/*
* Operations inside struct sdhci_ops
*/
/* Recover the Register Setting cleared during SOFTWARE_RESET_ALL */
static void xenon_reset_exit(struct sdhci_host *host,
unsigned char sdhc_id, u8 mask)
{
/* Only SOFTWARE RESET ALL will clear the register setting */
if (!(mask & SDHCI_RESET_ALL))
return;
/* Disable tuning request and auto-retuning again */
xenon_retune_setup(host);
xenon_set_acg(host, true);
xenon_set_sdclk_off_idle(host, sdhc_id, false);
xenon_mask_cmd_conflict_err(host);
}
static void xenon_reset(struct sdhci_host *host, u8 mask)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
sdhci_reset(host, mask);
xenon_reset_exit(host, priv->sdhc_id, mask);
}
/*
* Xenon defines different values for HS200 and HS400
* in Host_Control_2
*/
static void xenon_set_uhs_signaling(struct sdhci_host *host,
unsigned int timing)
{
u16 ctrl_2;
ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
/* Select Bus Speed Mode for host */
ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
if (timing == MMC_TIMING_MMC_HS200)
ctrl_2 |= XENON_CTRL_HS200;
else if (timing == MMC_TIMING_UHS_SDR104)
ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
else if (timing == MMC_TIMING_UHS_SDR12)
ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
else if (timing == MMC_TIMING_UHS_SDR25)
ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
else if (timing == MMC_TIMING_UHS_SDR50)
ctrl_2 |= SDHCI_CTRL_UHS_SDR50;
else if ((timing == MMC_TIMING_UHS_DDR50) ||
(timing == MMC_TIMING_MMC_DDR52))
ctrl_2 |= SDHCI_CTRL_UHS_DDR50;
else if (timing == MMC_TIMING_MMC_HS400)
ctrl_2 |= XENON_CTRL_HS400;
sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
}
static const struct sdhci_ops sdhci_xenon_ops = {
.set_clock = sdhci_set_clock,
.set_bus_width = sdhci_set_bus_width,
.reset = xenon_reset,
.set_uhs_signaling = xenon_set_uhs_signaling,
.get_max_clock = sdhci_pltfm_clk_get_max_clock,
};
static const struct sdhci_pltfm_data sdhci_xenon_pdata = {
.ops = &sdhci_xenon_ops,
.quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC |
SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER |
SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
};
/*
* Xenon Specific Operations in mmc_host_ops
*/
static void xenon_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct sdhci_host *host = mmc_priv(mmc);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
u32 reg;
/*
* HS400/HS200/eMMC HS doesn't have Preset Value register.
* However, sdhci_set_ios will read HS400/HS200 Preset register.
* Disable Preset Value register for HS400/HS200.
* eMMC HS with preset_enabled set will trigger a bug in
* get_preset_value().
*/
if ((ios->timing == MMC_TIMING_MMC_HS400) ||
(ios->timing == MMC_TIMING_MMC_HS200) ||
(ios->timing == MMC_TIMING_MMC_HS)) {
host->preset_enabled = false;
host->quirks2 |= SDHCI_QUIRK2_PRESET_VALUE_BROKEN;
host->flags &= ~SDHCI_PV_ENABLED;
reg = sdhci_readw(host, SDHCI_HOST_CONTROL2);
reg &= ~SDHCI_CTRL_PRESET_VAL_ENABLE;
sdhci_writew(host, reg, SDHCI_HOST_CONTROL2);
} else {
host->quirks2 &= ~SDHCI_QUIRK2_PRESET_VALUE_BROKEN;
}
sdhci_set_ios(mmc, ios);
if (host->clock > XENON_DEFAULT_SDCLK_FREQ)
xenon_set_sdclk_off_idle(host, priv->sdhc_id, true);
}
static int xenon_start_signal_voltage_switch(struct mmc_host *mmc,
struct mmc_ios *ios)
{
struct sdhci_host *host = mmc_priv(mmc);
/*
* Before SD/SDIO set signal voltage, SD bus clock should be
* disabled. However, sdhci_set_clock will also disable the Internal
* clock in mmc_set_signal_voltage().
* If Internal clock is disabled, the 3.3V/1.8V bit can not be updated.
* Thus here manually enable internal clock.
*
* After switch completes, it is unnecessary to disable internal clock,
* since keeping internal clock active obeys SD spec.
*/
xenon_enable_internal_clk(host);
/*
* If Vqmmc is fixed on platform, vqmmc regulator should be unavailable.
* Thus SDHCI_CTRL_VDD_180 bit might not work then.
* Skip the standard voltage switch to avoid any issue.
*/
if (PTR_ERR(mmc->supply.vqmmc) == -ENODEV)
return 0;
return sdhci_start_signal_voltage_switch(mmc, ios);
}
/*
* Update card type.
* priv->init_card_type will be used in PHY timing adjustment.
*/
static void xenon_init_card(struct mmc_host *mmc, struct mmc_card *card)
{
struct sdhci_host *host = mmc_priv(mmc);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
/* Update card type*/
priv->init_card_type = card->type;
}
static int xenon_execute_tuning(struct mmc_host *mmc, u32 opcode)
{
struct sdhci_host *host = mmc_priv(mmc);
if (host->timing == MMC_TIMING_UHS_DDR50)
return 0;
/*
* Currently force Xenon driver back to support mode 1 only,
* even though Xenon might claim to support mode 2 or mode 3.
* It requires more time to test mode 2/mode 3 on more platforms.
*/
if (host->tuning_mode != SDHCI_TUNING_MODE_1)
xenon_retune_setup(host);
return sdhci_execute_tuning(mmc, opcode);
}
static void xenon_enable_sdio_irq(struct mmc_host *mmc, int enable)
{
struct sdhci_host *host = mmc_priv(mmc);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
u32 reg;
u8 sdhc_id = priv->sdhc_id;
sdhci_enable_sdio_irq(mmc, enable);
if (enable) {
/*
* Set SDIO Card Inserted indication
* to enable detecting SDIO async irq.
*/
reg = sdhci_readl(host, XENON_SYS_CFG_INFO);
reg |= (1 << (sdhc_id + XENON_SLOT_TYPE_SDIO_SHIFT));
sdhci_writel(host, reg, XENON_SYS_CFG_INFO);
} else {
/* Clear SDIO Card Inserted indication */
reg = sdhci_readl(host, XENON_SYS_CFG_INFO);
reg &= ~(1 << (sdhc_id + XENON_SLOT_TYPE_SDIO_SHIFT));
sdhci_writel(host, reg, XENON_SYS_CFG_INFO);
}
}
static void xenon_replace_mmc_host_ops(struct sdhci_host *host)
{
host->mmc_host_ops.set_ios = xenon_set_ios;
host->mmc_host_ops.start_signal_voltage_switch =
xenon_start_signal_voltage_switch;
host->mmc_host_ops.init_card = xenon_init_card;
host->mmc_host_ops.execute_tuning = xenon_execute_tuning;
host->mmc_host_ops.enable_sdio_irq = xenon_enable_sdio_irq;
}
/*
* Parse Xenon specific DT properties:
* sdhc-id: the index of current SDHC.
* Refer to XENON_SYS_CFG_INFO register
* tun-count: the interval between re-tuning
*/
static int xenon_probe_dt(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct sdhci_host *host = platform_get_drvdata(pdev);
struct mmc_host *mmc = host->mmc;
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
u32 sdhc_id, nr_sdhc;
u32 tuning_count;
/* Disable HS200 on Armada AP806 */
if (of_device_is_compatible(np, "marvell,armada-ap806-sdhci"))
host->quirks2 |= SDHCI_QUIRK2_BROKEN_HS200;
sdhc_id = 0x0;
if (!of_property_read_u32(np, "marvell,xenon-sdhc-id", &sdhc_id)) {
nr_sdhc = sdhci_readl(host, XENON_SYS_CFG_INFO);
nr_sdhc &= XENON_NR_SUPPORTED_SLOT_MASK;
if (unlikely(sdhc_id > nr_sdhc)) {
dev_err(mmc_dev(mmc), "SDHC Index %d exceeds Number of SDHCs %d\n",
sdhc_id, nr_sdhc);
return -EINVAL;
}
}
priv->sdhc_id = sdhc_id;
tuning_count = XENON_DEF_TUNING_COUNT;
if (!of_property_read_u32(np, "marvell,xenon-tun-count",
&tuning_count)) {
if (unlikely(tuning_count >= XENON_TMR_RETUN_NO_PRESENT)) {
dev_err(mmc_dev(mmc), "Wrong Re-tuning Count. Set default value %d\n",
XENON_DEF_TUNING_COUNT);
tuning_count = XENON_DEF_TUNING_COUNT;
}
}
priv->tuning_count = tuning_count;
return 0;
}
static int xenon_sdhc_prepare(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
u8 sdhc_id = priv->sdhc_id;
/* Enable SDHC */
xenon_enable_sdhc(host, sdhc_id);
/* Enable ACG */
xenon_set_acg(host, true);
/* Enable Parallel Transfer Mode */
xenon_enable_sdhc_parallel_tran(host, sdhc_id);
/* Disable SDCLK-Off-While-Idle before card init */
xenon_set_sdclk_off_idle(host, sdhc_id, false);
xenon_mask_cmd_conflict_err(host);
return 0;
}
static void xenon_sdhc_unprepare(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
u8 sdhc_id = priv->sdhc_id;
/* disable SDHC */
xenon_disable_sdhc(host, sdhc_id);
}
static int xenon_probe(struct platform_device *pdev)
{
struct sdhci_pltfm_host *pltfm_host;
struct sdhci_host *host;
struct xenon_priv *priv;
int err;
host = sdhci_pltfm_init(pdev, &sdhci_xenon_pdata,
sizeof(struct xenon_priv));
if (IS_ERR(host))
return PTR_ERR(host);
pltfm_host = sdhci_priv(host);
priv = sdhci_pltfm_priv(pltfm_host);
/*
* Link Xenon specific mmc_host_ops function,
* to replace standard ones in sdhci_ops.
*/
xenon_replace_mmc_host_ops(host);
pltfm_host->clk = devm_clk_get(&pdev->dev, "core");
if (IS_ERR(pltfm_host->clk)) {
err = PTR_ERR(pltfm_host->clk);
dev_err(&pdev->dev, "Failed to setup input clk: %d\n", err);
goto free_pltfm;
}
err = clk_prepare_enable(pltfm_host->clk);
if (err)
goto free_pltfm;
err = mmc_of_parse(host->mmc);
if (err)
goto err_clk;
sdhci_get_of_property(pdev);
xenon_set_acg(host, false);
/* Xenon specific dt parse */
err = xenon_probe_dt(pdev);
if (err)
goto err_clk;
err = xenon_sdhc_prepare(host);
if (err)
goto err_clk;
err = sdhci_add_host(host);
if (err)
goto remove_sdhc;
return 0;
remove_sdhc:
xenon_sdhc_unprepare(host);
err_clk:
clk_disable_unprepare(pltfm_host->clk);
free_pltfm:
sdhci_pltfm_free(pdev);
return err;
}
static int xenon_remove(struct platform_device *pdev)
{
struct sdhci_host *host = platform_get_drvdata(pdev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
xenon_sdhc_unprepare(host);
sdhci_remove_host(host, 0);
clk_disable_unprepare(pltfm_host->clk);
sdhci_pltfm_free(pdev);
return 0;
}
static const struct of_device_id sdhci_xenon_dt_ids[] = {
{ .compatible = "marvell,armada-ap806-sdhci",},
{ .compatible = "marvell,armada-cp110-sdhci",},
{ .compatible = "marvell,armada-3700-sdhci",},
{}
};
MODULE_DEVICE_TABLE(of, sdhci_xenon_dt_ids);
static struct platform_driver sdhci_xenon_driver = {
.driver = {
.name = "xenon-sdhci",
.of_match_table = sdhci_xenon_dt_ids,
.pm = &sdhci_pltfm_pmops,
},
.probe = xenon_probe,
.remove = xenon_remove,
};
module_platform_driver(sdhci_xenon_driver);
MODULE_DESCRIPTION("SDHCI platform driver for Marvell Xenon SDHC");
MODULE_AUTHOR("Hu Ziji <huziji@marvell.com>");
MODULE_LICENSE("GPL v2");

60
drivers/mmc/host/sdhci-xenon.h Normal file
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@ -0,0 +1,60 @@
/*
* Copyright (C) 2016 Marvell, All Rights Reserved.
*
* Author: Hu Ziji <huziji@marvell.com>
* Date: 2016-8-24
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation version 2.
*/
#ifndef SDHCI_XENON_H_
#define SDHCI_XENON_H_
/* Register Offset of Xenon SDHC self-defined register */
#define XENON_SYS_CFG_INFO 0x0104
#define XENON_SLOT_TYPE_SDIO_SHIFT 24
#define XENON_NR_SUPPORTED_SLOT_MASK 0x7
#define XENON_SYS_OP_CTRL 0x0108
#define XENON_AUTO_CLKGATE_DISABLE_MASK BIT(20)
#define XENON_SDCLK_IDLEOFF_ENABLE_SHIFT 8
#define XENON_SLOT_ENABLE_SHIFT 0
#define XENON_SYS_EXT_OP_CTRL 0x010C
#define XENON_MASK_CMD_CONFLICT_ERR BIT(8)
#define XENON_SLOT_RETUNING_REQ_CTRL 0x0144
/* retuning compatible */
#define XENON_RETUNING_COMPATIBLE 0x1
/* Tuning Parameter */
#define XENON_TMR_RETUN_NO_PRESENT 0xF
#define XENON_DEF_TUNING_COUNT 0x9
#define XENON_DEFAULT_SDCLK_FREQ 400000
/* Xenon specific Mode Select value */
#define XENON_CTRL_HS200 0x5
#define XENON_CTRL_HS400 0x6
struct xenon_priv {
unsigned char tuning_count;
/* idx of SDHC */
u8 sdhc_id;
/*
* eMMC/SD/SDIO require different register settings.
* Xenon driver has to recognize card type
* before mmc_host->card is not available.
* This field records the card type during init.
* It is updated in xenon_init_card().
*
* It is only valid during initialization after it is updated.
* Do not access this variable in normal transfers after
* initialization completes.
*/
unsigned int init_card_type;
};
#endif