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linux/drivers/mmc/host/sdhci-st.c
Lee Jones 3ae50f4512 mmc: sdhci-st: Handle interconnect clock 
Some ST platforms contain interconnect (ICN) clocks which must be handed
correctly in order to obtain full functionality of a given IP.  In this
case, if the ICN clocks are not handled properly by the ST SDHCI driver
MMC will break and the following output can be observed:

    [   13.916949] mmc0: Timeout waiting for hardware interrupt.
    [   13.922349] sdhci: =========== REGISTER DUMP (mmc0)===========
    [   13.928175] sdhci: Sys addr: 0x00000000 | Version:  0x00001002
    [   13.933999] sdhci: Blk size: 0x00007040 | Blk cnt:  0x00000001
    [   13.939825] sdhci: Argument: 0x00fffff0 | Trn mode: 0x00000013
    [   13.945650] sdhci: Present:  0x1fff0206 | Host ctl: 0x00000011
    [   13.951475] sdhci: Power:    0x0000000f | Blk gap:  0x00000080
    [   13.957300] sdhci: Wake-up:  0x00000000 | Clock:    0x00003f07
    [   13.963126] sdhci: Timeout:  0x00000004 | Int stat: 0x00000000
    [   13.968952] sdhci: Int enab: 0x02ff008b | Sig enab: 0x02ff008b
    [   13.974777] sdhci: AC12 err: 0x00000000 | Slot int: 0x00000000
    [   13.980602] sdhci: Caps:     0x21ed3281 | Caps_1:   0x00000000
    [   13.986428] sdhci: Cmd:      0x0000063a | Max curr: 0x00000000
    [   13.992252] sdhci: Host ctl2: 0x00000000
    [   13.996166] sdhci: ADMA Err: 0x00000000 | ADMA Ptr: 0x7c048200
    [   14.001990] sdhci: ===========================================
    [   14.009802] mmc0: Got data interrupt 0x02000000 even though no data operation was in progress.

A decent point was raised about minimising the use of a local variable that
we 'could' do without.  I've chosen consistency over the possibility of
reducing the local variable count by 1.  Thinking that it's more important
for the code to be grouped and authoured in a similar manner/style for
greater maintainability/readability.

Cc: stable@vger.kernel.org
Tested-by: Peter Griffin <peter.griffin@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2016-09-12 10:31:43 +02:00

526 lines
14 KiB
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/*
* 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);
}
/**
* 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);
}
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);
}
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;
}
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;
}
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);
}
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;
}
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;
}
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;
}
#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;
}
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);
}
#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");
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