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u-boot/drivers/mmc/xenon_sdhci.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style 
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

498 lines
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// SPDX-License-Identifier: GPL-2.0
/*
* Driver for Marvell SOC Platform Group Xenon SDHC as a platform device
*
* Copyright (C) 2016 Marvell, All Rights Reserved.
*
* Author: Victor Gu <xigu@marvell.com>
* Date: 2016-8-24
*
* Included parts of the Linux driver version which was written by:
* Hu Ziji <huziji@marvell.com>
*
* Ported to from Marvell 2015.01 to mainline U-Boot 2017.01:
* Stefan Roese <sr@denx.de>
*/
#include <common.h>
#include <dm.h>
#include <fdtdec.h>
#include <linux/libfdt.h>
#include <malloc.h>
#include <sdhci.h>
DECLARE_GLOBAL_DATA_PTR;
/* Register Offset of SD Host Controller SOCP self-defined register */
#define SDHC_SYS_CFG_INFO 0x0104
#define SLOT_TYPE_SDIO_SHIFT 24
#define SLOT_TYPE_EMMC_MASK 0xFF
#define SLOT_TYPE_EMMC_SHIFT 16
#define SLOT_TYPE_SD_SDIO_MMC_MASK 0xFF
#define SLOT_TYPE_SD_SDIO_MMC_SHIFT 8
#define NR_SUPPORTED_SLOT_MASK 0x7
#define SDHC_SYS_OP_CTRL 0x0108
#define AUTO_CLKGATE_DISABLE_MASK BIT(20)
#define SDCLK_IDLEOFF_ENABLE_SHIFT 8
#define SLOT_ENABLE_SHIFT 0
#define SDHC_SYS_EXT_OP_CTRL 0x010C
#define MASK_CMD_CONFLICT_ERROR BIT(8)
#define SDHC_SLOT_RETUNING_REQ_CTRL 0x0144
/* retuning compatible */
#define RETUNING_COMPATIBLE 0x1
/* Xenon specific Mode Select value */
#define XENON_SDHCI_CTRL_HS200 0x5
#define XENON_SDHCI_CTRL_HS400 0x6
#define EMMC_PHY_REG_BASE 0x170
#define EMMC_PHY_TIMING_ADJUST EMMC_PHY_REG_BASE
#define OUTPUT_QSN_PHASE_SELECT BIT(17)
#define SAMPL_INV_QSP_PHASE_SELECT BIT(18)
#define SAMPL_INV_QSP_PHASE_SELECT_SHIFT 18
#define EMMC_PHY_SLOW_MODE BIT(29)
#define PHY_INITIALIZAION BIT(31)
#define WAIT_CYCLE_BEFORE_USING_MASK 0xf
#define WAIT_CYCLE_BEFORE_USING_SHIFT 12
#define FC_SYNC_EN_DURATION_MASK 0xf
#define FC_SYNC_EN_DURATION_SHIFT 8
#define FC_SYNC_RST_EN_DURATION_MASK 0xf
#define FC_SYNC_RST_EN_DURATION_SHIFT 4
#define FC_SYNC_RST_DURATION_MASK 0xf
#define FC_SYNC_RST_DURATION_SHIFT 0
#define EMMC_PHY_FUNC_CONTROL (EMMC_PHY_REG_BASE + 0x4)
#define DQ_ASYNC_MODE BIT(4)
#define DQ_DDR_MODE_SHIFT 8
#define DQ_DDR_MODE_MASK 0xff
#define CMD_DDR_MODE BIT(16)
#define EMMC_PHY_PAD_CONTROL (EMMC_PHY_REG_BASE + 0x8)
#define REC_EN_SHIFT 24
#define REC_EN_MASK 0xf
#define FC_DQ_RECEN BIT(24)
#define FC_CMD_RECEN BIT(25)
#define FC_QSP_RECEN BIT(26)
#define FC_QSN_RECEN BIT(27)
#define OEN_QSN BIT(28)
#define AUTO_RECEN_CTRL BIT(30)
#define EMMC_PHY_PAD_CONTROL1 (EMMC_PHY_REG_BASE + 0xc)
#define EMMC5_1_FC_QSP_PD BIT(9)
#define EMMC5_1_FC_QSP_PU BIT(25)
#define EMMC5_1_FC_CMD_PD BIT(8)
#define EMMC5_1_FC_CMD_PU BIT(24)
#define EMMC5_1_FC_DQ_PD 0xff
#define EMMC5_1_FC_DQ_PU (0xff << 16)
#define SDHCI_RETUNE_EVT_INTSIG 0x00001000
/* Hyperion only have one slot 0 */
#define XENON_MMC_SLOT_ID_HYPERION 0
#define MMC_TIMING_LEGACY 0
#define MMC_TIMING_MMC_HS 1
#define MMC_TIMING_SD_HS 2
#define MMC_TIMING_UHS_SDR12 3
#define MMC_TIMING_UHS_SDR25 4
#define MMC_TIMING_UHS_SDR50 5
#define MMC_TIMING_UHS_SDR104 6
#define MMC_TIMING_UHS_DDR50 7
#define MMC_TIMING_MMC_DDR52 8
#define MMC_TIMING_MMC_HS200 9
#define MMC_TIMING_MMC_HS400 10
#define XENON_MMC_MAX_CLK 400000000
enum soc_pad_ctrl_type {
SOC_PAD_SD,
SOC_PAD_FIXED_1_8V,
};
struct xenon_sdhci_plat {
struct mmc_config cfg;
struct mmc mmc;
};
struct xenon_sdhci_priv {
struct sdhci_host host;
u8 timing;
unsigned int clock;
void *pad_ctrl_reg;
int pad_type;
};
static int xenon_mmc_phy_init(struct sdhci_host *host)
{
struct xenon_sdhci_priv *priv = host->mmc->priv;
u32 clock = priv->clock;
u32 time;
u32 var;
/* Enable QSP PHASE SELECT */
var = sdhci_readl(host, EMMC_PHY_TIMING_ADJUST);
var |= SAMPL_INV_QSP_PHASE_SELECT;
if ((priv->timing == MMC_TIMING_UHS_SDR50) ||
(priv->timing == MMC_TIMING_UHS_SDR25) ||
(priv->timing == MMC_TIMING_UHS_SDR12) ||
(priv->timing == MMC_TIMING_SD_HS) ||
(priv->timing == MMC_TIMING_LEGACY))
var |= EMMC_PHY_SLOW_MODE;
sdhci_writel(host, var, EMMC_PHY_TIMING_ADJUST);
/* Poll for host MMC PHY clock init to be stable */
/* Wait up to 10ms */
time = 100;
while (time--) {
var = sdhci_readl(host, SDHCI_CLOCK_CONTROL);
if (var & SDHCI_CLOCK_INT_STABLE)
break;
udelay(100);
}
if (time <= 0) {
pr_err("Failed to enable MMC internal clock in time\n");
return -ETIMEDOUT;
}
/* Init PHY */
var = sdhci_readl(host, EMMC_PHY_TIMING_ADJUST);
var |= PHY_INITIALIZAION;
sdhci_writel(host, var, EMMC_PHY_TIMING_ADJUST);
if (clock == 0) {
/* Use the possibly slowest bus frequency value */
clock = 100000;
}
/* Poll for host eMMC PHY init to complete */
/* Wait up to 10ms */
time = 100;
while (time--) {
var = sdhci_readl(host, EMMC_PHY_TIMING_ADJUST);
var &= PHY_INITIALIZAION;
if (!var)
break;
/* wait for host eMMC PHY init to complete */
udelay(100);
}
if (time <= 0) {
pr_err("Failed to init MMC PHY in time\n");
return -ETIMEDOUT;
}
return 0;
}
#define ARMADA_3700_SOC_PAD_1_8V 0x1
#define ARMADA_3700_SOC_PAD_3_3V 0x0
static void armada_3700_soc_pad_voltage_set(struct sdhci_host *host)
{
struct xenon_sdhci_priv *priv = host->mmc->priv;
if (priv->pad_type == SOC_PAD_FIXED_1_8V)
writel(ARMADA_3700_SOC_PAD_1_8V, priv->pad_ctrl_reg);
else if (priv->pad_type == SOC_PAD_SD)
writel(ARMADA_3700_SOC_PAD_3_3V, priv->pad_ctrl_reg);
}
static void xenon_mmc_phy_set(struct sdhci_host *host)
{
struct xenon_sdhci_priv *priv = host->mmc->priv;
u32 var;
/* Setup pad, set bit[30], bit[28] and bits[26:24] */
var = sdhci_readl(host, EMMC_PHY_PAD_CONTROL);
var |= AUTO_RECEN_CTRL | OEN_QSN | FC_QSP_RECEN |
FC_CMD_RECEN | FC_DQ_RECEN;
sdhci_writel(host, var, EMMC_PHY_PAD_CONTROL);
/* Set CMD and DQ Pull Up */
var = sdhci_readl(host, EMMC_PHY_PAD_CONTROL1);
var |= (EMMC5_1_FC_CMD_PU | EMMC5_1_FC_DQ_PU);
var &= ~(EMMC5_1_FC_CMD_PD | EMMC5_1_FC_DQ_PD);
sdhci_writel(host, var, EMMC_PHY_PAD_CONTROL1);
/*
* If timing belongs to high speed, set bit[17] of
* EMMC_PHY_TIMING_ADJUST register
*/
if ((priv->timing == MMC_TIMING_MMC_HS400) ||
(priv->timing == MMC_TIMING_MMC_HS200) ||
(priv->timing == MMC_TIMING_UHS_SDR50) ||
(priv->timing == MMC_TIMING_UHS_SDR104) ||
(priv->timing == MMC_TIMING_UHS_DDR50) ||
(priv->timing == MMC_TIMING_UHS_SDR25) ||
(priv->timing == MMC_TIMING_MMC_DDR52)) {
var = sdhci_readl(host, EMMC_PHY_TIMING_ADJUST);
var |= OUTPUT_QSN_PHASE_SELECT;
sdhci_writel(host, var, EMMC_PHY_TIMING_ADJUST);
}
/*
* When setting EMMC_PHY_FUNC_CONTROL register,
* SD clock should be disabled
*/
var = sdhci_readl(host, SDHCI_CLOCK_CONTROL);
var &= ~SDHCI_CLOCK_CARD_EN;
sdhci_writew(host, var, SDHCI_CLOCK_CONTROL);
var = sdhci_readl(host, EMMC_PHY_FUNC_CONTROL);
if (host->mmc->ddr_mode) {
var |= (DQ_DDR_MODE_MASK << DQ_DDR_MODE_SHIFT) | CMD_DDR_MODE;
} else {
var &= ~((DQ_DDR_MODE_MASK << DQ_DDR_MODE_SHIFT) |
CMD_DDR_MODE);
}
sdhci_writel(host, var, EMMC_PHY_FUNC_CONTROL);
/* Enable bus clock */
var = sdhci_readl(host, SDHCI_CLOCK_CONTROL);
var |= SDHCI_CLOCK_CARD_EN;
sdhci_writew(host, var, SDHCI_CLOCK_CONTROL);
xenon_mmc_phy_init(host);
}
/* Enable/Disable the Auto Clock Gating function of this slot */
static void xenon_mmc_set_acg(struct sdhci_host *host, bool enable)
{
u32 var;
var = sdhci_readl(host, SDHC_SYS_OP_CTRL);
if (enable)
var &= ~AUTO_CLKGATE_DISABLE_MASK;
else
var |= AUTO_CLKGATE_DISABLE_MASK;
sdhci_writel(host, var, SDHC_SYS_OP_CTRL);
}
#define SLOT_MASK(slot) BIT(slot)
/* Enable specific slot */
static void xenon_mmc_enable_slot(struct sdhci_host *host, u8 slot)
{
u32 var;
var = sdhci_readl(host, SDHC_SYS_OP_CTRL);
var |= SLOT_MASK(slot) << SLOT_ENABLE_SHIFT;
sdhci_writel(host, var, SDHC_SYS_OP_CTRL);
}
/* Enable Parallel Transfer Mode */
static void xenon_mmc_enable_parallel_tran(struct sdhci_host *host, u8 slot)
{
u32 var;
var = sdhci_readl(host, SDHC_SYS_EXT_OP_CTRL);
var |= SLOT_MASK(slot);
sdhci_writel(host, var, SDHC_SYS_EXT_OP_CTRL);
}
static void xenon_mmc_disable_tuning(struct sdhci_host *host, u8 slot)
{
u32 var;
/* Clear the Re-Tuning Request functionality */
var = sdhci_readl(host, SDHC_SLOT_RETUNING_REQ_CTRL);
var &= ~RETUNING_COMPATIBLE;
sdhci_writel(host, var, SDHC_SLOT_RETUNING_REQ_CTRL);
/* Clear the Re-tuning Event Signal Enable */
var = sdhci_readl(host, SDHCI_SIGNAL_ENABLE);
var &= ~SDHCI_RETUNE_EVT_INTSIG;
sdhci_writel(host, var, SDHCI_SIGNAL_ENABLE);
}
/* Mask command conflict error */
static void xenon_mask_cmd_conflict_err(struct sdhci_host *host)
{
u32 reg;
reg = sdhci_readl(host, SDHC_SYS_EXT_OP_CTRL);
reg |= MASK_CMD_CONFLICT_ERROR;
sdhci_writel(host, reg, SDHC_SYS_EXT_OP_CTRL);
}
/* Platform specific function for post set_ios configuration */
static void xenon_sdhci_set_ios_post(struct sdhci_host *host)
{
struct xenon_sdhci_priv *priv = host->mmc->priv;
uint speed = host->mmc->tran_speed;
int pwr_18v = 0;
if ((sdhci_readb(host, SDHCI_POWER_CONTROL) & ~SDHCI_POWER_ON) ==
SDHCI_POWER_180)
pwr_18v = 1;
/* Set timing variable according to the configured speed */
if (IS_SD(host->mmc)) {
/* SD/SDIO */
if (pwr_18v) {
if (host->mmc->ddr_mode)
priv->timing = MMC_TIMING_UHS_DDR50;
else if (speed <= 25000000)
priv->timing = MMC_TIMING_UHS_SDR25;
else
priv->timing = MMC_TIMING_UHS_SDR50;
} else {
if (speed <= 25000000)
priv->timing = MMC_TIMING_LEGACY;
else
priv->timing = MMC_TIMING_SD_HS;
}
} else {
/* eMMC */
if (host->mmc->ddr_mode)
priv->timing = MMC_TIMING_MMC_DDR52;
else if (speed <= 26000000)
priv->timing = MMC_TIMING_LEGACY;
else
priv->timing = MMC_TIMING_MMC_HS;
}
/* Re-init the PHY */
xenon_mmc_phy_set(host);
}
/* Install a driver specific handler for post set_ios configuration */
static const struct sdhci_ops xenon_sdhci_ops = {
.set_ios_post = xenon_sdhci_set_ios_post
};
static int xenon_sdhci_probe(struct udevice *dev)
{
struct xenon_sdhci_plat *plat = dev_get_platdata(dev);
struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
struct xenon_sdhci_priv *priv = dev_get_priv(dev);
struct sdhci_host *host = dev_get_priv(dev);
int ret;
host->mmc = &plat->mmc;
host->mmc->priv = host;
host->mmc->dev = dev;
upriv->mmc = host->mmc;
/* Set quirks */
host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD | SDHCI_QUIRK_32BIT_DMA_ADDR;
/* Set default timing */
priv->timing = MMC_TIMING_LEGACY;
/* Disable auto clock gating during init */
xenon_mmc_set_acg(host, false);
/* Enable slot */
xenon_mmc_enable_slot(host, XENON_MMC_SLOT_ID_HYPERION);
/*
* Set default power on SoC PHY PAD register (currently only
* available on the Armada 3700)
*/
if (priv->pad_ctrl_reg)
armada_3700_soc_pad_voltage_set(host);
host->host_caps = MMC_MODE_HS | MMC_MODE_HS_52MHz | MMC_MODE_DDR_52MHz;
switch (fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), "bus-width",
1)) {
case 8:
host->host_caps |= MMC_MODE_8BIT;
break;
case 4:
host->host_caps |= MMC_MODE_4BIT;
break;
case 1:
break;
default:
printf("Invalid \"bus-width\" value\n");
return -EINVAL;
}
host->ops = &xenon_sdhci_ops;
host->max_clk = XENON_MMC_MAX_CLK;
ret = sdhci_setup_cfg(&plat->cfg, host, 0, 0);
if (ret)
return ret;
ret = sdhci_probe(dev);
if (ret)
return ret;
/* Enable parallel transfer */
xenon_mmc_enable_parallel_tran(host, XENON_MMC_SLOT_ID_HYPERION);
/* Disable tuning functionality of this slot */
xenon_mmc_disable_tuning(host, XENON_MMC_SLOT_ID_HYPERION);
/* Enable auto clock gating after init */
xenon_mmc_set_acg(host, true);
xenon_mask_cmd_conflict_err(host);
return ret;
}
static int xenon_sdhci_ofdata_to_platdata(struct udevice *dev)
{
struct sdhci_host *host = dev_get_priv(dev);
struct xenon_sdhci_priv *priv = dev_get_priv(dev);
const char *name;
host->name = dev->name;
host->ioaddr = (void *)devfdt_get_addr(dev);
if (device_is_compatible(dev, "marvell,armada-3700-sdhci"))
priv->pad_ctrl_reg = (void *)devfdt_get_addr_index(dev, 1);
name = fdt_getprop(gd->fdt_blob, dev_of_offset(dev), "marvell,pad-type",
NULL);
if (name) {
if (0 == strncmp(name, "sd", 2)) {
priv->pad_type = SOC_PAD_SD;
} else if (0 == strncmp(name, "fixed-1-8v", 10)) {
priv->pad_type = SOC_PAD_FIXED_1_8V;
} else {
printf("Unsupported SOC PHY PAD ctrl type %s\n", name);
return -EINVAL;
}
}
return 0;
}
static int xenon_sdhci_bind(struct udevice *dev)
{
struct xenon_sdhci_plat *plat = dev_get_platdata(dev);
return sdhci_bind(dev, &plat->mmc, &plat->cfg);
}
static const struct udevice_id xenon_sdhci_ids[] = {
{ .compatible = "marvell,armada-8k-sdhci",},
{ .compatible = "marvell,armada-3700-sdhci",},
{ }
};
U_BOOT_DRIVER(xenon_sdhci_drv) = {
.name = "xenon_sdhci",
.id = UCLASS_MMC,
.of_match = xenon_sdhci_ids,
.ofdata_to_platdata = xenon_sdhci_ofdata_to_platdata,
.ops = &sdhci_ops,
.bind = xenon_sdhci_bind,
.probe = xenon_sdhci_probe,
.priv_auto_alloc_size = sizeof(struct xenon_sdhci_priv),
.platdata_auto_alloc_size = sizeof(struct xenon_sdhci_plat),
};
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