Release 4.11 drivers/mmc/host/sdhci-st.c
/*
* Support for SDHCI on STMicroelectronics SoCs
*
* Copyright (C) 2014 STMicroelectronics Ltd
* Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
* Contributors: Peter Griffin <peter.griffin@linaro.org>
*
* Based on sdhci-cns3xxx.c
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/io.h>
#include <linux/of.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/mmc/host.h>
#include <linux/reset.h>
#include "sdhci-pltfm.h"
struct st_mmc_platform_data {
struct reset_control *rstc;
struct clk *icnclk;
void __iomem *top_ioaddr;
};
/* MMCSS glue logic to setup the HC on some ST SoCs (e.g. STiH407 family) */
#define ST_MMC_CCONFIG_REG_1 0x400
#define ST_MMC_CCONFIG_TIMEOUT_CLK_UNIT BIT(24)
#define ST_MMC_CCONFIG_TIMEOUT_CLK_FREQ BIT(12)
#define ST_MMC_CCONFIG_TUNING_COUNT_DEFAULT BIT(8)
#define ST_MMC_CCONFIG_ASYNC_WAKEUP BIT(0)
#define ST_MMC_CCONFIG_1_DEFAULT \
((ST_MMC_CCONFIG_TIMEOUT_CLK_UNIT) | \
(ST_MMC_CCONFIG_TIMEOUT_CLK_FREQ) | \
(ST_MMC_CCONFIG_TUNING_COUNT_DEFAULT))
#define ST_MMC_CCONFIG_REG_2 0x404
#define ST_MMC_CCONFIG_HIGH_SPEED BIT(28)
#define ST_MMC_CCONFIG_ADMA2 BIT(24)
#define ST_MMC_CCONFIG_8BIT BIT(20)
#define ST_MMC_CCONFIG_MAX_BLK_LEN 16
#define MAX_BLK_LEN_1024 1
#define MAX_BLK_LEN_2048 2
#define BASE_CLK_FREQ_200 0xc8
#define BASE_CLK_FREQ_100 0x64
#define BASE_CLK_FREQ_50 0x32
#define ST_MMC_CCONFIG_2_DEFAULT \
(ST_MMC_CCONFIG_HIGH_SPEED | ST_MMC_CCONFIG_ADMA2 | \
ST_MMC_CCONFIG_8BIT | \
(MAX_BLK_LEN_1024 << ST_MMC_CCONFIG_MAX_BLK_LEN))
#define ST_MMC_CCONFIG_REG_3 0x408
#define ST_MMC_CCONFIG_EMMC_SLOT_TYPE BIT(28)
#define ST_MMC_CCONFIG_64BIT BIT(24)
#define ST_MMC_CCONFIG_ASYNCH_INTR_SUPPORT BIT(20)
#define ST_MMC_CCONFIG_1P8_VOLT BIT(16)
#define ST_MMC_CCONFIG_3P0_VOLT BIT(12)
#define ST_MMC_CCONFIG_3P3_VOLT BIT(8)
#define ST_MMC_CCONFIG_SUSP_RES_SUPPORT BIT(4)
#define ST_MMC_CCONFIG_SDMA BIT(0)
#define ST_MMC_CCONFIG_3_DEFAULT \
(ST_MMC_CCONFIG_ASYNCH_INTR_SUPPORT | \
ST_MMC_CCONFIG_3P3_VOLT | \
ST_MMC_CCONFIG_SUSP_RES_SUPPORT | \
ST_MMC_CCONFIG_SDMA)
#define ST_MMC_CCONFIG_REG_4 0x40c
#define ST_MMC_CCONFIG_D_DRIVER BIT(20)
#define ST_MMC_CCONFIG_C_DRIVER BIT(16)
#define ST_MMC_CCONFIG_A_DRIVER BIT(12)
#define ST_MMC_CCONFIG_DDR50 BIT(8)
#define ST_MMC_CCONFIG_SDR104 BIT(4)
#define ST_MMC_CCONFIG_SDR50 BIT(0)
#define ST_MMC_CCONFIG_4_DEFAULT 0
#define ST_MMC_CCONFIG_REG_5 0x410
#define ST_MMC_CCONFIG_TUNING_FOR_SDR50 BIT(8)
#define RETUNING_TIMER_CNT_MAX 0xf
#define ST_MMC_CCONFIG_5_DEFAULT 0
/* I/O configuration for Arasan IP */
#define ST_MMC_GP_OUTPUT 0x450
#define ST_MMC_GP_OUTPUT_CD BIT(12)
#define ST_MMC_STATUS_R 0x460
#define ST_TOP_MMC_DLY_FIX_OFF(x) (x - 0x8)
/* TOP config registers to manage static and dynamic delay */
#define ST_TOP_MMC_TX_CLK_DLY ST_TOP_MMC_DLY_FIX_OFF(0x8)
#define ST_TOP_MMC_RX_CLK_DLY ST_TOP_MMC_DLY_FIX_OFF(0xc)
/* MMC delay control register */
#define ST_TOP_MMC_DLY_CTRL ST_TOP_MMC_DLY_FIX_OFF(0x18)
#define ST_TOP_MMC_DLY_CTRL_DLL_BYPASS_CMD BIT(0)
#define ST_TOP_MMC_DLY_CTRL_DLL_BYPASS_PH_SEL BIT(1)
#define ST_TOP_MMC_DLY_CTRL_TX_DLL_ENABLE BIT(8)
#define ST_TOP_MMC_DLY_CTRL_RX_DLL_ENABLE BIT(9)
#define ST_TOP_MMC_DLY_CTRL_ATUNE_NOT_CFG_DLY BIT(10)
#define ST_TOP_MMC_START_DLL_LOCK BIT(11)
/* register to provide the phase-shift value for DLL */
#define ST_TOP_MMC_TX_DLL_STEP_DLY ST_TOP_MMC_DLY_FIX_OFF(0x1c)
#define ST_TOP_MMC_RX_DLL_STEP_DLY ST_TOP_MMC_DLY_FIX_OFF(0x20)
#define ST_TOP_MMC_RX_CMD_STEP_DLY ST_TOP_MMC_DLY_FIX_OFF(0x24)
/* phase shift delay on the tx clk 2.188ns */
#define ST_TOP_MMC_TX_DLL_STEP_DLY_VALID 0x6
#define ST_TOP_MMC_DLY_MAX 0xf
#define ST_TOP_MMC_DYN_DLY_CONF \
(ST_TOP_MMC_DLY_CTRL_TX_DLL_ENABLE | \
ST_TOP_MMC_DLY_CTRL_ATUNE_NOT_CFG_DLY | \
ST_TOP_MMC_START_DLL_LOCK)
/*
* For clock speeds greater than 90MHz, we need to check that the
* DLL procedure has finished before switching to ultra-speed modes.
*/
#define CLK_TO_CHECK_DLL_LOCK 90000000
static inline void st_mmcss_set_static_delay(void __iomem *ioaddr)
{
if (!ioaddr)
return;
writel_relaxed(0x0, ioaddr + ST_TOP_MMC_DLY_CTRL);
writel_relaxed(ST_TOP_MMC_DLY_MAX,
ioaddr + ST_TOP_MMC_TX_CLK_DLY);
}
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/**
* st_mmcss_cconfig: configure the Arasan HC inside the flashSS.
* @np: dt device node.
* @host: sdhci host
* Description: this function is to configure the Arasan host controller.
* On some ST SoCs, i.e. STiH407 family, the MMC devices inside a dedicated
* flashSS sub-system which needs to be configured to be compliant to eMMC 4.5
* or eMMC4.3. This has to be done before registering the sdhci host.
*/
static void st_mmcss_cconfig(struct device_node *np, struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct mmc_host *mhost = host->mmc;
u32 cconf2, cconf3, cconf4, cconf5;
if (!of_device_is_compatible(np, "st,sdhci-stih407"))
return;
cconf2 = ST_MMC_CCONFIG_2_DEFAULT;
cconf3 = ST_MMC_CCONFIG_3_DEFAULT;
cconf4 = ST_MMC_CCONFIG_4_DEFAULT;
cconf5 = ST_MMC_CCONFIG_5_DEFAULT;
writel_relaxed(ST_MMC_CCONFIG_1_DEFAULT,
host->ioaddr + ST_MMC_CCONFIG_REG_1);
/* Set clock frequency, default to 50MHz if max-frequency is not
* provided */
switch (mhost->f_max) {
case 200000000:
clk_set_rate(pltfm_host->clk, mhost->f_max);
cconf2 |= BASE_CLK_FREQ_200;
break;
case 100000000:
clk_set_rate(pltfm_host->clk, mhost->f_max);
cconf2 |= BASE_CLK_FREQ_100;
break;
default:
clk_set_rate(pltfm_host->clk, 50000000);
cconf2 |= BASE_CLK_FREQ_50;
}
writel_relaxed(cconf2, host->ioaddr + ST_MMC_CCONFIG_REG_2);
if (!mmc_card_is_removable(mhost))
cconf3 |= ST_MMC_CCONFIG_EMMC_SLOT_TYPE;
else
/* CARD _D ET_CTRL */
writel_relaxed(ST_MMC_GP_OUTPUT_CD,
host->ioaddr + ST_MMC_GP_OUTPUT);
if (mhost->caps & MMC_CAP_UHS_SDR50) {
/* use 1.8V */
cconf3 |= ST_MMC_CCONFIG_1P8_VOLT;
cconf4 |= ST_MMC_CCONFIG_SDR50;
/* Use tuning */
cconf5 |= ST_MMC_CCONFIG_TUNING_FOR_SDR50;
/* Max timeout for retuning */
cconf5 |= RETUNING_TIMER_CNT_MAX;
}
if (mhost->caps & MMC_CAP_UHS_SDR104) {
/*
* SDR104 implies the HC can support HS200 mode, so
* it's mandatory to use 1.8V
*/
cconf3 |= ST_MMC_CCONFIG_1P8_VOLT;
cconf4 |= ST_MMC_CCONFIG_SDR104;
/* Max timeout for retuning */
cconf5 |= RETUNING_TIMER_CNT_MAX;
}
if (mhost->caps & MMC_CAP_UHS_DDR50)
cconf4 |= ST_MMC_CCONFIG_DDR50;
writel_relaxed(cconf3, host->ioaddr + ST_MMC_CCONFIG_REG_3);
writel_relaxed(cconf4, host->ioaddr + ST_MMC_CCONFIG_REG_4);
writel_relaxed(cconf5, host->ioaddr + ST_MMC_CCONFIG_REG_5);
}
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static inline void st_mmcss_set_dll(void __iomem *ioaddr)
{
if (!ioaddr)
return;
writel_relaxed(ST_TOP_MMC_DYN_DLY_CONF, ioaddr + ST_TOP_MMC_DLY_CTRL);
writel_relaxed(ST_TOP_MMC_TX_DLL_STEP_DLY_VALID,
ioaddr + ST_TOP_MMC_TX_DLL_STEP_DLY);
}
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static int st_mmcss_lock_dll(void __iomem *ioaddr)
{
unsigned long curr, value;
unsigned long finish = jiffies + HZ;
/* Checks if the DLL procedure is finished */
do {
curr = jiffies;
value = readl(ioaddr + ST_MMC_STATUS_R);
if (value & 0x1)
return 0;
cpu_relax();
} while (!time_after_eq(curr, finish));
return -EBUSY;
}
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static int sdhci_st_set_dll_for_clock(struct sdhci_host *host)
{
int ret = 0;
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct st_mmc_platform_data *pdata = sdhci_pltfm_priv(pltfm_host);
if (host->clock > CLK_TO_CHECK_DLL_LOCK) {
st_mmcss_set_dll(pdata->top_ioaddr);
ret = st_mmcss_lock_dll(host->ioaddr);
}
return ret;
}
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| Total | 65 | 100.00% | 2 | 100.00% |
static void sdhci_st_set_uhs_signaling(struct sdhci_host *host,
unsigned int uhs)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct st_mmc_platform_data *pdata = sdhci_pltfm_priv(pltfm_host);
u16 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
int ret = 0;
/* Select Bus Speed Mode for host */
ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
switch (uhs) {
/*
* Set V18_EN -- UHS modes do not work without this.
* does not change signaling voltage
*/
case MMC_TIMING_UHS_SDR12:
st_mmcss_set_static_delay(pdata->top_ioaddr);
ctrl_2 |= SDHCI_CTRL_UHS_SDR12 | SDHCI_CTRL_VDD_180;
break;
case MMC_TIMING_UHS_SDR25:
st_mmcss_set_static_delay(pdata->top_ioaddr);
ctrl_2 |= SDHCI_CTRL_UHS_SDR25 | SDHCI_CTRL_VDD_180;
break;
case MMC_TIMING_UHS_SDR50:
st_mmcss_set_static_delay(pdata->top_ioaddr);
ctrl_2 |= SDHCI_CTRL_UHS_SDR50 | SDHCI_CTRL_VDD_180;
ret = sdhci_st_set_dll_for_clock(host);
break;
case MMC_TIMING_UHS_SDR104:
case MMC_TIMING_MMC_HS200:
st_mmcss_set_static_delay(pdata->top_ioaddr);
ctrl_2 |= SDHCI_CTRL_UHS_SDR104 | SDHCI_CTRL_VDD_180;
ret = sdhci_st_set_dll_for_clock(host);
break;
case MMC_TIMING_UHS_DDR50:
case MMC_TIMING_MMC_DDR52:
st_mmcss_set_static_delay(pdata->top_ioaddr);
ctrl_2 |= SDHCI_CTRL_UHS_DDR50 | SDHCI_CTRL_VDD_180;
break;
}
if (ret)
dev_warn(mmc_dev(host->mmc), "Error setting dll for clock "
"(uhs %d)\n", uhs);
dev_dbg(mmc_dev(host->mmc), "uhs %d, ctrl_2 %04X\n", uhs, ctrl_2);
sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
}
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| Total | 212 | 100.00% | 2 | 100.00% |
static u32 sdhci_st_readl(struct sdhci_host *host, int reg)
{
u32 ret;
switch (reg) {
case SDHCI_CAPABILITIES:
ret = readl_relaxed(host->ioaddr + reg);
/* Support 3.3V and 1.8V */
ret &= ~SDHCI_CAN_VDD_300;
break;
default:
ret = readl_relaxed(host->ioaddr + reg);
}
return ret;
}
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static const struct sdhci_ops sdhci_st_ops = {
.get_max_clock = sdhci_pltfm_clk_get_max_clock,
.set_clock = sdhci_set_clock,
.set_bus_width = sdhci_set_bus_width,
.read_l = sdhci_st_readl,
.reset = sdhci_reset,
.set_uhs_signaling = sdhci_st_set_uhs_signaling,
};
static const struct sdhci_pltfm_data sdhci_st_pdata = {
.ops = &sdhci_st_ops,
.quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC |
SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
SDHCI_QUIRK_NO_HISPD_BIT,
.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
SDHCI_QUIRK2_STOP_WITH_TC,
};
static int sdhci_st_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct sdhci_host *host;
struct st_mmc_platform_data *pdata;
struct sdhci_pltfm_host *pltfm_host;
struct clk *clk, *icnclk;
int ret = 0;
u16 host_version;
struct resource *res;
struct reset_control *rstc;
clk = devm_clk_get(&pdev->dev, "mmc");
if (IS_ERR(clk)) {
dev_err(&pdev->dev, "Peripheral clk not found\n");
return PTR_ERR(clk);
}
/* ICN clock isn't compulsory, but use it if it's provided. */
icnclk = devm_clk_get(&pdev->dev, "icn");
if (IS_ERR(icnclk))
icnclk = NULL;
rstc = devm_reset_control_get(&pdev->dev, NULL);
if (IS_ERR(rstc))
rstc = NULL;
else
reset_control_deassert(rstc);
host = sdhci_pltfm_init(pdev, &sdhci_st_pdata, sizeof(*pdata));
if (IS_ERR(host)) {
dev_err(&pdev->dev, "Failed sdhci_pltfm_init\n");
ret = PTR_ERR(host);
goto err_pltfm_init;
}
pltfm_host = sdhci_priv(host);
pdata = sdhci_pltfm_priv(pltfm_host);
pdata->rstc = rstc;
ret = mmc_of_parse(host->mmc);
if (ret) {
dev_err(&pdev->dev, "Failed mmc_of_parse\n");
goto err_of;
}
clk_prepare_enable(clk);
clk_prepare_enable(icnclk);
/* Configure the FlashSS Top registers for setting eMMC TX/RX delay */
res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
"top-mmc-delay");
pdata->top_ioaddr = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(pdata->top_ioaddr)) {
dev_warn(&pdev->dev, "FlashSS Top Dly registers not available");
pdata->top_ioaddr = NULL;
}
pltfm_host->clk = clk;
pdata->icnclk = icnclk;
/* Configure the Arasan HC inside the flashSS */
st_mmcss_cconfig(np, host);
ret = sdhci_add_host(host);
if (ret) {
dev_err(&pdev->dev, "Failed sdhci_add_host\n");
goto err_out;
}
platform_set_drvdata(pdev, host);
host_version = readw_relaxed((host->ioaddr + SDHCI_HOST_VERSION));
dev_info(&pdev->dev, "SDHCI ST Initialised: Host Version: 0x%x Vendor Version 0x%x\n",
((host_version & SDHCI_SPEC_VER_MASK) >> SDHCI_SPEC_VER_SHIFT),
((host_version & SDHCI_VENDOR_VER_MASK) >>
SDHCI_VENDOR_VER_SHIFT));
return 0;
err_out:
clk_disable_unprepare(icnclk);
clk_disable_unprepare(clk);
err_of:
sdhci_pltfm_free(pdev);
err_pltfm_init:
if (rstc)
reset_control_assert(rstc);
return ret;
}
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| Person | Tokens | Prop | Commits | CommitProp |
| Peter Griffin | 363 | 82.31% | 3 | 50.00% |
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| JiSheng Zhang | 30 | 6.80% | 1 | 16.67% |
| Ulf Hansson | 5 | 1.13% | 1 | 16.67% |
| Total | 441 | 100.00% | 6 | 100.00% |
static int sdhci_st_remove(struct platform_device *pdev)
{
struct sdhci_host *host = platform_get_drvdata(pdev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct st_mmc_platform_data *pdata = sdhci_pltfm_priv(pltfm_host);
struct reset_control *rstc = pdata->rstc;
int ret;
ret = sdhci_pltfm_unregister(pdev);
clk_disable_unprepare(pdata->icnclk);
if (rstc)
reset_control_assert(rstc);
return ret;
}
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| Person | Tokens | Prop | Commits | CommitProp |
| Peter Griffin | 61 | 77.22% | 2 | 50.00% |
| JiSheng Zhang | 11 | 13.92% | 1 | 25.00% |
| Lee Jones | 7 | 8.86% | 1 | 25.00% |
| Total | 79 | 100.00% | 4 | 100.00% |
#ifdef CONFIG_PM_SLEEP
static int sdhci_st_suspend(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct st_mmc_platform_data *pdata = sdhci_pltfm_priv(pltfm_host);
int ret = sdhci_suspend_host(host);
if (ret)
goto out;
if (pdata->rstc)
reset_control_assert(pdata->rstc);
clk_disable_unprepare(pdata->icnclk);
clk_disable_unprepare(pltfm_host->clk);
out:
return ret;
}
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| Person | Tokens | Prop | Commits | CommitProp |
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| Total | 88 | 100.00% | 4 | 100.00% |
static int sdhci_st_resume(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct st_mmc_platform_data *pdata = sdhci_pltfm_priv(pltfm_host);
struct device_node *np = dev->of_node;
clk_prepare_enable(pltfm_host->clk);
clk_prepare_enable(pdata->icnclk);
if (pdata->rstc)
reset_control_deassert(pdata->rstc);
st_mmcss_cconfig(np, host);
return sdhci_resume_host(host);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Peter Griffin | 80 | 88.89% | 3 | 60.00% |
| Lee Jones | 7 | 7.78% | 1 | 20.00% |
| JiSheng Zhang | 3 | 3.33% | 1 | 20.00% |
| Total | 90 | 100.00% | 5 | 100.00% |
#endif
static SIMPLE_DEV_PM_OPS(sdhci_st_pmops, sdhci_st_suspend, sdhci_st_resume);
static const struct of_device_id st_sdhci_match[] = {
{ .compatible = "st,sdhci" },
{},
};
MODULE_DEVICE_TABLE(of, st_sdhci_match);
static struct platform_driver sdhci_st_driver = {
.probe = sdhci_st_probe,
.remove = sdhci_st_remove,
.driver = {
.name = "sdhci-st",
.pm = &sdhci_st_pmops,
.of_match_table = of_match_ptr(st_sdhci_match),
},
};
module_platform_driver(sdhci_st_driver);
MODULE_DESCRIPTION("SDHCI driver for STMicroelectronics SoCs");
MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:sdhci-st");
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Peter Griffin | 1787 | 93.12% | 7 | 58.33% |
| Lee Jones | 69 | 3.60% | 1 | 8.33% |
| JiSheng Zhang | 53 | 2.76% | 1 | 8.33% |
| Ulf Hansson | 5 | 0.26% | 1 | 8.33% |
| Jaehoon Chung | 4 | 0.21% | 1 | 8.33% |
| Zhangfei Gao | 1 | 0.05% | 1 | 8.33% |
| Total | 1919 | 100.00% | 12 | 100.00% |
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