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u-boot-brain/drivers/mmc/am654_sdhci.c
Faiz Abbas a851213920 mmc: am654_sdhci: Implement workaround for card detect 
The 4 bit MMC controllers have an internal debounce for the SDCD line
with a debounce delay of 1 second. Therefore, after clocks to the IP are
enabled, software has to wait for this time before it can power on the
controller.

Add a deferred_probe() callback which polls on sdcd for a maximum of 2 seconds
before switching on power to the controller or (in the case of no card)
returning a ENOMEDIUM. This pushes the 1 second wait time to when the
card is actually needed rather than at every probe() making sure that
users who don't insert an SD card in the slot don't have to wait such a
long time.

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
2020-03-09 08:33:16 +08:00

499 lines
12 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
*
* Texas Instruments' K3 SD Host Controller Interface
*/
#include <clk.h>
#include <common.h>
#include <dm.h>
#include <malloc.h>
#include <power-domain.h>
#include <regmap.h>
#include <sdhci.h>
#include <dm/device_compat.h>
#include <linux/err.h>
/* CTL_CFG Registers */
#define CTL_CFG_2 0x14
#define SLOTTYPE_MASK GENMASK(31, 30)
#define SLOTTYPE_EMBEDDED BIT(30)
/* PHY Registers */
#define PHY_CTRL1 0x100
#define PHY_CTRL2 0x104
#define PHY_CTRL3 0x108
#define PHY_CTRL4 0x10C
#define PHY_CTRL5 0x110
#define PHY_CTRL6 0x114
#define PHY_STAT1 0x130
#define PHY_STAT2 0x134
#define IOMUX_ENABLE_SHIFT 31
#define IOMUX_ENABLE_MASK BIT(IOMUX_ENABLE_SHIFT)
#define OTAPDLYENA_SHIFT 20
#define OTAPDLYENA_MASK BIT(OTAPDLYENA_SHIFT)
#define OTAPDLYSEL_SHIFT 12
#define OTAPDLYSEL_MASK GENMASK(15, 12)
#define STRBSEL_SHIFT 24
#define STRBSEL_4BIT_MASK GENMASK(27, 24)
#define STRBSEL_8BIT_MASK GENMASK(31, 24)
#define SEL50_SHIFT 8
#define SEL50_MASK BIT(SEL50_SHIFT)
#define SEL100_SHIFT 9
#define SEL100_MASK BIT(SEL100_SHIFT)
#define FREQSEL_SHIFT 8
#define FREQSEL_MASK GENMASK(10, 8)
#define DLL_TRIM_ICP_SHIFT 4
#define DLL_TRIM_ICP_MASK GENMASK(7, 4)
#define DR_TY_SHIFT 20
#define DR_TY_MASK GENMASK(22, 20)
#define ENDLL_SHIFT 1
#define ENDLL_MASK BIT(ENDLL_SHIFT)
#define DLLRDY_SHIFT 0
#define DLLRDY_MASK BIT(DLLRDY_SHIFT)
#define PDB_SHIFT 0
#define PDB_MASK BIT(PDB_SHIFT)
#define CALDONE_SHIFT 1
#define CALDONE_MASK BIT(CALDONE_SHIFT)
#define RETRIM_SHIFT 17
#define RETRIM_MASK BIT(RETRIM_SHIFT)
#define DRIVER_STRENGTH_50_OHM 0x0
#define DRIVER_STRENGTH_33_OHM 0x1
#define DRIVER_STRENGTH_66_OHM 0x2
#define DRIVER_STRENGTH_100_OHM 0x3
#define DRIVER_STRENGTH_40_OHM 0x4
#define AM654_SDHCI_MIN_FREQ 400000
struct am654_sdhci_plat {
struct mmc_config cfg;
struct mmc mmc;
struct regmap *base;
bool non_removable;
u32 otap_del_sel[11];
u32 trm_icp;
u32 drv_strength;
u32 strb_sel;
u32 flags;
#define DLL_PRESENT (1 << 0)
#define IOMUX_PRESENT (1 << 1)
#define FREQSEL_2_BIT (1 << 2)
#define STRBSEL_4_BIT (1 << 3)
bool dll_on;
};
struct timing_data {
const char *binding;
u32 capability;
};
static const struct timing_data td[] = {
[MMC_LEGACY] = {"ti,otap-del-sel-legacy", 0},
[MMC_HS] = {"ti,otap-del-sel-mmc-hs", MMC_CAP(MMC_HS)},
[SD_HS] = {"ti,otap-del-sel-sd-hs", MMC_CAP(SD_HS)},
[UHS_SDR12] = {"ti,otap-del-sel-sdr12", MMC_CAP(UHS_SDR12)},
[UHS_SDR25] = {"ti,otap-del-sel-sdr25", MMC_CAP(UHS_SDR25)},
[UHS_SDR50] = {"ti,otap-del-sel-sdr50", MMC_CAP(UHS_SDR50)},
[UHS_SDR104] = {"ti,otap-del-sel-sdr104", MMC_CAP(UHS_SDR104)},
[UHS_DDR50] = {"ti,otap-del-sel-ddr50", MMC_CAP(UHS_DDR50)},
[MMC_DDR_52] = {"ti,otap-del-sel-ddr52", MMC_CAP(MMC_DDR_52)},
[MMC_HS_200] = {"ti,otap-del-sel-hs200", MMC_CAP(MMC_HS_200)},
[MMC_HS_400] = {"ti,otap-del-sel-hs400", MMC_CAP(MMC_HS_400)},
};
struct am654_driver_data {
const struct sdhci_ops *ops;
u32 flags;
};
static void am654_sdhci_set_control_reg(struct sdhci_host *host)
{
struct mmc *mmc = (struct mmc *)host->mmc;
u32 reg;
if (IS_SD(host->mmc) &&
mmc->signal_voltage == MMC_SIGNAL_VOLTAGE_180) {
reg = sdhci_readw(host, SDHCI_HOST_CONTROL2);
reg |= SDHCI_CTRL_VDD_180;
sdhci_writew(host, reg, SDHCI_HOST_CONTROL2);
}
sdhci_set_uhs_timing(host);
}
static int am654_sdhci_set_ios_post(struct sdhci_host *host)
{
struct udevice *dev = host->mmc->dev;
struct am654_sdhci_plat *plat = dev_get_platdata(dev);
unsigned int speed = host->mmc->clock;
int sel50, sel100, freqsel;
u32 otap_del_sel;
u32 mask, val;
int ret;
/* Reset SD Clock Enable */
val = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
val &= ~SDHCI_CLOCK_CARD_EN;
sdhci_writew(host, val, SDHCI_CLOCK_CONTROL);
/* power off phy */
if (plat->dll_on) {
regmap_update_bits(plat->base, PHY_CTRL1, ENDLL_MASK, 0);
plat->dll_on = false;
}
/* restart clock */
sdhci_set_clock(host->mmc, speed);
/* switch phy back on */
if (speed > AM654_SDHCI_MIN_FREQ) {
otap_del_sel = plat->otap_del_sel[host->mmc->selected_mode];
mask = OTAPDLYENA_MASK | OTAPDLYSEL_MASK;
val = (1 << OTAPDLYENA_SHIFT) |
(otap_del_sel << OTAPDLYSEL_SHIFT);
/* Write to STRBSEL for HS400 speed mode */
if (host->mmc->selected_mode == MMC_HS_400) {
if (plat->flags & STRBSEL_4_BIT)
mask |= STRBSEL_4BIT_MASK;
else
mask |= STRBSEL_8BIT_MASK;
val |= plat->strb_sel << STRBSEL_SHIFT;
}
regmap_update_bits(plat->base, PHY_CTRL4, mask, val);
if (plat->flags & FREQSEL_2_BIT) {
switch (speed) {
case 200000000:
sel50 = 0;
sel100 = 0;
break;
case 100000000:
sel50 = 0;
sel100 = 1;
break;
default:
sel50 = 1;
sel100 = 0;
}
/* Configure PHY DLL frequency */
mask = SEL50_MASK | SEL100_MASK;
val = (sel50 << SEL50_SHIFT) | (sel100 << SEL100_SHIFT);
regmap_update_bits(plat->base, PHY_CTRL5, mask, val);
} else {
switch (speed) {
case 200000000:
freqsel = 0x0;
break;
default:
freqsel = 0x4;
}
regmap_update_bits(plat->base, PHY_CTRL5, FREQSEL_MASK,
freqsel << FREQSEL_SHIFT);
}
/* Enable DLL */
regmap_update_bits(plat->base, PHY_CTRL1, ENDLL_MASK,
0x1 << ENDLL_SHIFT);
/*
* Poll for DLL ready. Use a one second timeout.
* Works in all experiments done so far
*/
ret = regmap_read_poll_timeout(plat->base, PHY_STAT1, val,
val & DLLRDY_MASK, 1000, 1000000);
if (ret)
return ret;
plat->dll_on = true;
}
return 0;
}
int am654_sdhci_init(struct am654_sdhci_plat *plat)
{
u32 ctl_cfg_2 = 0;
u32 mask, val;
int ret;
/* Reset OTAP to default value */
mask = OTAPDLYENA_MASK | OTAPDLYSEL_MASK;
regmap_update_bits(plat->base, PHY_CTRL4, mask, 0x0);
if (plat->flags & DLL_PRESENT) {
regmap_read(plat->base, PHY_STAT1, &val);
if (~val & CALDONE_MASK) {
/* Calibrate IO lines */
regmap_update_bits(plat->base, PHY_CTRL1, PDB_MASK,
PDB_MASK);
ret = regmap_read_poll_timeout(plat->base, PHY_STAT1,
val, val & CALDONE_MASK,
1, 20);
if (ret)
return ret;
}
/* Configure DLL TRIM */
mask = DLL_TRIM_ICP_MASK;
val = plat->trm_icp << DLL_TRIM_ICP_SHIFT;
/* Configure DLL driver strength */
mask |= DR_TY_MASK;
val |= plat->drv_strength << DR_TY_SHIFT;
regmap_update_bits(plat->base, PHY_CTRL1, mask, val);
}
/* Enable pins by setting IO mux to 0 */
if (plat->flags & IOMUX_PRESENT)
regmap_update_bits(plat->base, PHY_CTRL1, IOMUX_ENABLE_MASK, 0);
/* Set slot type based on SD or eMMC */
if (plat->non_removable)
ctl_cfg_2 = SLOTTYPE_EMBEDDED;
regmap_update_bits(plat->base, CTL_CFG_2, SLOTTYPE_MASK, ctl_cfg_2);
return 0;
}
#define MAX_SDCD_DEBOUNCE_TIME 2000
static int am654_sdhci_deferred_probe(struct sdhci_host *host)
{
struct udevice *dev = host->mmc->dev;
struct am654_sdhci_plat *plat = dev_get_platdata(dev);
unsigned long start;
int val;
/*
* The controller takes about 1 second to debounce the card detect line
* and doesn't let us power on until that time is up. Instead of waiting
* for 1 second at every stage, poll on the CARD_PRESENT bit upto a
* maximum of 2 seconds to be safe..
*/
start = get_timer(0);
do {
if (get_timer(start) > MAX_SDCD_DEBOUNCE_TIME)
return -ENOMEDIUM;
val = mmc_getcd(host->mmc);
} while (!val);
am654_sdhci_init(plat);
return sdhci_probe(dev);
}
const struct sdhci_ops am654_sdhci_ops = {
.deferred_probe = am654_sdhci_deferred_probe,
.set_ios_post = &am654_sdhci_set_ios_post,
.set_control_reg = &am654_sdhci_set_control_reg,
};
const struct am654_driver_data am654_drv_data = {
.ops = &am654_sdhci_ops,
.flags = IOMUX_PRESENT | FREQSEL_2_BIT | DLL_PRESENT | STRBSEL_4_BIT,
};
const struct am654_driver_data j721e_8bit_drv_data = {
.ops = &am654_sdhci_ops,
.flags = DLL_PRESENT,
};
static int j721e_4bit_sdhci_set_ios_post(struct sdhci_host *host)
{
struct udevice *dev = host->mmc->dev;
struct am654_sdhci_plat *plat = dev_get_platdata(dev);
u32 otap_del_sel, mask, val;
otap_del_sel = plat->otap_del_sel[host->mmc->selected_mode];
mask = OTAPDLYENA_MASK | OTAPDLYSEL_MASK;
val = (1 << OTAPDLYENA_SHIFT) | (otap_del_sel << OTAPDLYSEL_SHIFT);
regmap_update_bits(plat->base, PHY_CTRL4, mask, val);
return 0;
}
const struct sdhci_ops j721e_4bit_sdhci_ops = {
.deferred_probe = am654_sdhci_deferred_probe,
.set_ios_post = &j721e_4bit_sdhci_set_ios_post,
};
const struct am654_driver_data j721e_4bit_drv_data = {
.ops = &j721e_4bit_sdhci_ops,
.flags = IOMUX_PRESENT,
};
static int sdhci_am654_get_otap_delay(struct udevice *dev,
struct mmc_config *cfg)
{
struct am654_sdhci_plat *plat = dev_get_platdata(dev);
int ret;
int i;
/* ti,otap-del-sel-legacy is mandatory */
ret = dev_read_u32(dev, "ti,otap-del-sel-legacy",
&plat->otap_del_sel[0]);
if (ret)
return ret;
/*
* Remove the corresponding capability if an otap-del-sel
* value is not found
*/
for (i = MMC_HS; i <= MMC_HS_400; i++) {
ret = dev_read_u32(dev, td[i].binding, &plat->otap_del_sel[i]);
if (ret) {
dev_dbg(dev, "Couldn't find %s\n", td[i].binding);
/*
* Remove the corresponding capability
* if an otap-del-sel value is not found
*/
cfg->host_caps &= ~td[i].capability;
}
}
return 0;
}
static int am654_sdhci_probe(struct udevice *dev)
{
struct am654_driver_data *drv_data =
(struct am654_driver_data *)dev_get_driver_data(dev);
struct am654_sdhci_plat *plat = dev_get_platdata(dev);
struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
struct sdhci_host *host = dev_get_priv(dev);
struct mmc_config *cfg = &plat->cfg;
struct clk clk;
unsigned long clock;
int ret;
ret = clk_get_by_name(dev, "clk_xin", &clk);
if (ret) {
dev_err(dev, "failed to get clock\n");
return ret;
}
clock = clk_get_rate(&clk);
if (IS_ERR_VALUE(clock)) {
dev_err(dev, "failed to get rate\n");
return clock;
}
host->max_clk = clock;
host->mmc = &plat->mmc;
host->mmc->dev = dev;
ret = sdhci_setup_cfg(cfg, host, cfg->f_max,
AM654_SDHCI_MIN_FREQ);
if (ret)
return ret;
ret = sdhci_am654_get_otap_delay(dev, cfg);
if (ret)
return ret;
host->ops = drv_data->ops;
host->mmc->priv = host;
upriv->mmc = host->mmc;
regmap_init_mem_index(dev_ofnode(dev), &plat->base, 1);
return 0;
}
static int am654_sdhci_ofdata_to_platdata(struct udevice *dev)
{
struct am654_sdhci_plat *plat = dev_get_platdata(dev);
struct sdhci_host *host = dev_get_priv(dev);
struct mmc_config *cfg = &plat->cfg;
u32 drv_strength;
int ret;
host->name = dev->name;
host->ioaddr = (void *)dev_read_addr(dev);
plat->non_removable = dev_read_bool(dev, "non-removable");
if (plat->flags & DLL_PRESENT) {
ret = dev_read_u32(dev, "ti,trm-icp", &plat->trm_icp);
if (ret)
return ret;
ret = dev_read_u32(dev, "ti,driver-strength-ohm",
&drv_strength);
if (ret)
return ret;
switch (drv_strength) {
case 50:
plat->drv_strength = DRIVER_STRENGTH_50_OHM;
break;
case 33:
plat->drv_strength = DRIVER_STRENGTH_33_OHM;
break;
case 66:
plat->drv_strength = DRIVER_STRENGTH_66_OHM;
break;
case 100:
plat->drv_strength = DRIVER_STRENGTH_100_OHM;
break;
case 40:
plat->drv_strength = DRIVER_STRENGTH_40_OHM;
break;
default:
dev_err(dev, "Invalid driver strength\n");
return -EINVAL;
}
}
ret = mmc_of_parse(dev, cfg);
if (ret)
return ret;
return 0;
}
static int am654_sdhci_bind(struct udevice *dev)
{
struct am654_driver_data *drv_data =
(struct am654_driver_data *)dev_get_driver_data(dev);
struct am654_sdhci_plat *plat = dev_get_platdata(dev);
plat->flags = drv_data->flags;
return sdhci_bind(dev, &plat->mmc, &plat->cfg);
}
static const struct udevice_id am654_sdhci_ids[] = {
{
.compatible = "ti,am654-sdhci-5.1",
.data = (ulong)&am654_drv_data,
},
{
.compatible = "ti,j721e-sdhci-8bit",
.data = (ulong)&j721e_8bit_drv_data,
},
{
.compatible = "ti,j721e-sdhci-4bit",
.data = (ulong)&j721e_4bit_drv_data,
},
{ }
};
U_BOOT_DRIVER(am654_sdhci_drv) = {
.name = "am654_sdhci",
.id = UCLASS_MMC,
.of_match = am654_sdhci_ids,
.ofdata_to_platdata = am654_sdhci_ofdata_to_platdata,
.ops = &sdhci_ops,
.bind = am654_sdhci_bind,
.probe = am654_sdhci_probe,
.priv_auto_alloc_size = sizeof(struct sdhci_host),
.platdata_auto_alloc_size = sizeof(struct am654_sdhci_plat),
};
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