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u-boot/drivers/mmc/rockchip_sdhci.c
Yifeng Zhao 022f552704 mmc: rockchip_sdhci: enable strobe line for HS400 
The default configuration of rk3399 EMMC PHY does not enable the
strobe line, and EMMC controller will got data transmission error
at HS400 mode.

Signed-off-by: Yifeng Zhao <yifeng.zhao@rock-chips.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
2021-10-15 20:57:41 +08:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2016 Fuzhou Rockchip Electronics Co., Ltd
*
* Rockchip SD Host Controller Interface
*/
#include <common.h>
#include <clk.h>
#include <dm.h>
#include <dm/ofnode.h>
#include <dt-structs.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/libfdt.h>
#include <linux/iopoll.h>
#include <malloc.h>
#include <mapmem.h>
#include "mmc_private.h"
#include <sdhci.h>
#include <syscon.h>
#include <asm/arch-rockchip/clock.h>
#include <asm/arch-rockchip/hardware.h>
/* 400KHz is max freq for card ID etc. Use that as min */
#define EMMC_MIN_FREQ 400000
#define KHz (1000)
#define MHz (1000 * KHz)
#define SDHCI_TUNING_LOOP_COUNT 40
#define PHYCTRL_CALDONE_MASK 0x1
#define PHYCTRL_CALDONE_SHIFT 0x6
#define PHYCTRL_CALDONE_DONE 0x1
#define PHYCTRL_DLLRDY_MASK 0x1
#define PHYCTRL_DLLRDY_SHIFT 0x5
#define PHYCTRL_DLLRDY_DONE 0x1
#define PHYCTRL_FREQSEL_200M 0x0
#define PHYCTRL_FREQSEL_50M 0x1
#define PHYCTRL_FREQSEL_100M 0x2
#define PHYCTRL_FREQSEL_150M 0x3
#define PHYCTRL_DLL_LOCK_WO_TMOUT(x) \
((((x) >> PHYCTRL_DLLRDY_SHIFT) & PHYCTRL_DLLRDY_MASK) ==\
PHYCTRL_DLLRDY_DONE)
/* Rockchip specific Registers */
#define DWCMSHC_EMMC_DLL_CTRL 0x800
#define DWCMSHC_EMMC_DLL_CTRL_RESET BIT(1)
#define DWCMSHC_EMMC_DLL_RXCLK 0x804
#define DWCMSHC_EMMC_DLL_TXCLK 0x808
#define DWCMSHC_EMMC_DLL_STRBIN 0x80c
#define DWCMSHC_EMMC_DLL_STATUS0 0x840
#define DWCMSHC_EMMC_DLL_STATUS1 0x844
#define DWCMSHC_EMMC_DLL_START BIT(0)
#define DWCMSHC_EMMC_DLL_RXCLK_SRCSEL 29
#define DWCMSHC_EMMC_DLL_START_POINT 16
#define DWCMSHC_EMMC_DLL_START_DEFAULT 5
#define DWCMSHC_EMMC_DLL_INC_VALUE 2
#define DWCMSHC_EMMC_DLL_INC 8
#define DWCMSHC_EMMC_DLL_DLYENA BIT(27)
#define DLL_TXCLK_TAPNUM_DEFAULT 0x10
#define DLL_STRBIN_TAPNUM_DEFAULT 0x3
#define DLL_TXCLK_TAPNUM_FROM_SW BIT(24)
#define DWCMSHC_EMMC_DLL_LOCKED BIT(8)
#define DWCMSHC_EMMC_DLL_TIMEOUT BIT(9)
#define DLL_RXCLK_NO_INVERTER 1
#define DLL_RXCLK_INVERTER 0
#define DWCMSHC_ENHANCED_STROBE BIT(8)
#define DLL_LOCK_WO_TMOUT(x) \
((((x) & DWCMSHC_EMMC_DLL_LOCKED) == DWCMSHC_EMMC_DLL_LOCKED) && \
(((x) & DWCMSHC_EMMC_DLL_TIMEOUT) == 0))
#define ROCKCHIP_MAX_CLKS 3
struct rockchip_sdhc_plat {
struct mmc_config cfg;
struct mmc mmc;
};
struct rockchip_emmc_phy {
u32 emmcphy_con[7];
u32 reserved;
u32 emmcphy_status;
};
struct rockchip_sdhc {
struct sdhci_host host;
struct udevice *dev;
void *base;
struct rockchip_emmc_phy *phy;
struct clk emmc_clk;
};
struct sdhci_data {
int (*emmc_set_clock)(struct sdhci_host *host, unsigned int clock);
int (*emmc_phy_init)(struct udevice *dev);
int (*get_phy)(struct udevice *dev);
};
static int rk3399_emmc_phy_init(struct udevice *dev)
{
return 0;
}
static void rk3399_emmc_phy_power_on(struct rockchip_emmc_phy *phy, u32 clock)
{
u32 caldone, dllrdy, freqsel;
writel(RK_CLRSETBITS(7 << 4, 0), &phy->emmcphy_con[6]);
writel(RK_CLRSETBITS(1 << 11, 1 << 11), &phy->emmcphy_con[0]);
writel(RK_CLRSETBITS(0xf << 7, 6 << 7), &phy->emmcphy_con[0]);
/*
* According to the user manual, calpad calibration
* cycle takes more than 2us without the minimal recommended
* value, so we may need a little margin here
*/
udelay(3);
writel(RK_CLRSETBITS(1, 1), &phy->emmcphy_con[6]);
/*
* According to the user manual, it asks driver to
* wait 5us for calpad busy trimming. But it seems that
* 5us of caldone isn't enough for all cases.
*/
udelay(500);
caldone = readl(&phy->emmcphy_status);
caldone = (caldone >> PHYCTRL_CALDONE_SHIFT) & PHYCTRL_CALDONE_MASK;
if (caldone != PHYCTRL_CALDONE_DONE) {
printf("%s: caldone timeout.\n", __func__);
return;
}
/* Set the frequency of the DLL operation */
if (clock < 75 * MHz)
freqsel = PHYCTRL_FREQSEL_50M;
else if (clock < 125 * MHz)
freqsel = PHYCTRL_FREQSEL_100M;
else if (clock < 175 * MHz)
freqsel = PHYCTRL_FREQSEL_150M;
else
freqsel = PHYCTRL_FREQSEL_200M;
/* Set the frequency of the DLL operation */
writel(RK_CLRSETBITS(3 << 12, freqsel << 12), &phy->emmcphy_con[0]);
writel(RK_CLRSETBITS(1 << 1, 1 << 1), &phy->emmcphy_con[6]);
/* REN Enable on STRB Line for HS400 */
writel(RK_CLRSETBITS(0, 1 << 9), &phy->emmcphy_con[2]);
read_poll_timeout(readl, &phy->emmcphy_status, dllrdy,
PHYCTRL_DLL_LOCK_WO_TMOUT(dllrdy), 1, 5000);
}
static void rk3399_emmc_phy_power_off(struct rockchip_emmc_phy *phy)
{
writel(RK_CLRSETBITS(1, 0), &phy->emmcphy_con[6]);
writel(RK_CLRSETBITS(1 << 1, 0), &phy->emmcphy_con[6]);
}
static int rk3399_emmc_get_phy(struct udevice *dev)
{
struct rockchip_sdhc *priv = dev_get_priv(dev);
ofnode phy_node;
void *grf_base;
u32 grf_phy_offset, phandle;
phandle = dev_read_u32_default(dev, "phys", 0);
phy_node = ofnode_get_by_phandle(phandle);
if (!ofnode_valid(phy_node)) {
debug("Not found emmc phy device\n");
return -ENODEV;
}
grf_base = syscon_get_first_range(ROCKCHIP_SYSCON_GRF);
if (grf_base < 0) {
printf("%s Get syscon grf failed", __func__);
return -ENODEV;
}
grf_phy_offset = ofnode_read_u32_default(phy_node, "reg", 0);
priv->phy = (struct rockchip_emmc_phy *)(grf_base + grf_phy_offset);
return 0;
}
static int rk3399_sdhci_emmc_set_clock(struct sdhci_host *host, unsigned int clock)
{
struct rockchip_sdhc *priv = container_of(host, struct rockchip_sdhc, host);
int cycle_phy = host->clock != clock && clock > EMMC_MIN_FREQ;
if (cycle_phy)
rk3399_emmc_phy_power_off(priv->phy);
sdhci_set_clock(host->mmc, clock);
if (cycle_phy)
rk3399_emmc_phy_power_on(priv->phy, clock);
return 0;
}
static int rk3568_emmc_phy_init(struct udevice *dev)
{
struct rockchip_sdhc *prv = dev_get_priv(dev);
struct sdhci_host *host = &prv->host;
u32 extra;
extra = DLL_RXCLK_NO_INVERTER << DWCMSHC_EMMC_DLL_RXCLK_SRCSEL;
sdhci_writel(host, extra, DWCMSHC_EMMC_DLL_RXCLK);
return 0;
}
static int rk3568_sdhci_emmc_set_clock(struct sdhci_host *host, unsigned int clock)
{
struct rockchip_sdhc *priv = container_of(host, struct rockchip_sdhc, host);
int val, ret;
u32 extra;
if (clock > host->max_clk)
clock = host->max_clk;
if (clock)
clk_set_rate(&priv->emmc_clk, clock);
sdhci_set_clock(host->mmc, clock);
if (clock >= 100 * MHz) {
/* reset DLL */
sdhci_writel(host, DWCMSHC_EMMC_DLL_CTRL_RESET, DWCMSHC_EMMC_DLL_CTRL);
udelay(1);
sdhci_writel(host, 0, DWCMSHC_EMMC_DLL_CTRL);
/* Init DLL settings */
extra = DWCMSHC_EMMC_DLL_START_DEFAULT << DWCMSHC_EMMC_DLL_START_POINT |
DWCMSHC_EMMC_DLL_INC_VALUE << DWCMSHC_EMMC_DLL_INC |
DWCMSHC_EMMC_DLL_START;
sdhci_writel(host, extra, DWCMSHC_EMMC_DLL_CTRL);
ret = read_poll_timeout(readl, host->ioaddr + DWCMSHC_EMMC_DLL_STATUS0,
val, DLL_LOCK_WO_TMOUT(val), 1, 500);
if (ret)
return ret;
extra = DWCMSHC_EMMC_DLL_DLYENA |
DLL_RXCLK_NO_INVERTER << DWCMSHC_EMMC_DLL_RXCLK_SRCSEL;
sdhci_writel(host, extra, DWCMSHC_EMMC_DLL_RXCLK);
extra = DWCMSHC_EMMC_DLL_DLYENA |
DLL_TXCLK_TAPNUM_DEFAULT |
DLL_TXCLK_TAPNUM_FROM_SW;
sdhci_writel(host, extra, DWCMSHC_EMMC_DLL_TXCLK);
extra = DWCMSHC_EMMC_DLL_DLYENA |
DLL_STRBIN_TAPNUM_DEFAULT;
sdhci_writel(host, extra, DWCMSHC_EMMC_DLL_STRBIN);
} else {
/* reset the clock phase when the frequency is lower than 100MHz */
sdhci_writel(host, 0, DWCMSHC_EMMC_DLL_CTRL);
extra = DLL_RXCLK_NO_INVERTER << DWCMSHC_EMMC_DLL_RXCLK_SRCSEL;
sdhci_writel(host, extra, DWCMSHC_EMMC_DLL_RXCLK);
sdhci_writel(host, 0, DWCMSHC_EMMC_DLL_TXCLK);
sdhci_writel(host, 0, DWCMSHC_EMMC_DLL_STRBIN);
}
return 0;
}
static int rk3568_emmc_get_phy(struct udevice *dev)
{
return 0;
}
static int rockchip_sdhci_set_ios_post(struct sdhci_host *host)
{
struct rockchip_sdhc *priv = container_of(host, struct rockchip_sdhc, host);
struct sdhci_data *data = (struct sdhci_data *)dev_get_driver_data(priv->dev);
struct mmc *mmc = host->mmc;
uint clock = mmc->tran_speed;
u32 reg;
if (!clock)
clock = mmc->clock;
if (data->emmc_set_clock)
data->emmc_set_clock(host, clock);
if (mmc->selected_mode == MMC_HS_400 || mmc->selected_mode == MMC_HS_400_ES) {
reg = sdhci_readw(host, SDHCI_HOST_CONTROL2);
reg &= ~SDHCI_CTRL_UHS_MASK;
reg |= SDHCI_CTRL_HS400;
sdhci_writew(host, reg, SDHCI_HOST_CONTROL2);
} else {
sdhci_set_uhs_timing(host);
}
return 0;
}
static int rockchip_sdhci_execute_tuning(struct mmc *mmc, u8 opcode)
{
struct sdhci_host *host = dev_get_priv(mmc->dev);
char tuning_loop_counter = SDHCI_TUNING_LOOP_COUNT;
struct mmc_cmd cmd;
u32 ctrl, blk_size;
int ret = 0;
ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
ctrl |= SDHCI_CTRL_EXEC_TUNING;
sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_INT_ENABLE);
sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_SIGNAL_ENABLE);
blk_size = SDHCI_MAKE_BLKSZ(SDHCI_DEFAULT_BOUNDARY_ARG, 64);
if (opcode == MMC_CMD_SEND_TUNING_BLOCK_HS200 && host->mmc->bus_width == 8)
blk_size = SDHCI_MAKE_BLKSZ(SDHCI_DEFAULT_BOUNDARY_ARG, 128);
sdhci_writew(host, blk_size, SDHCI_BLOCK_SIZE);
sdhci_writew(host, SDHCI_TRNS_READ, SDHCI_TRANSFER_MODE);
cmd.cmdidx = opcode;
cmd.resp_type = MMC_RSP_R1;
cmd.cmdarg = 0;
do {
if (tuning_loop_counter-- == 0)
break;
mmc_send_cmd(mmc, &cmd, NULL);
if (opcode == MMC_CMD_SEND_TUNING_BLOCK)
/*
* For tuning command, do not do busy loop. As tuning
* is happening (CLK-DATA latching for setup/hold time
* requirements), give time to complete
*/
udelay(1);
ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
} while (ctrl & SDHCI_CTRL_EXEC_TUNING);
if (!(ctrl & SDHCI_CTRL_TUNED_CLK)) {
printf("%s:Tuning failed\n", __func__);
ret = -EIO;
}
if (tuning_loop_counter < 0) {
ctrl &= ~SDHCI_CTRL_TUNED_CLK;
sdhci_writel(host, ctrl, SDHCI_HOST_CONTROL2);
}
/* Enable only interrupts served by the SD controller */
sdhci_writel(host, SDHCI_INT_DATA_MASK | SDHCI_INT_CMD_MASK, SDHCI_INT_ENABLE);
/* Mask all sdhci interrupt sources */
sdhci_writel(host, 0x0, SDHCI_SIGNAL_ENABLE);
return ret;
}
static struct sdhci_ops rockchip_sdhci_ops = {
.set_ios_post = rockchip_sdhci_set_ios_post,
.platform_execute_tuning = &rockchip_sdhci_execute_tuning,
};
static int rockchip_sdhci_probe(struct udevice *dev)
{
struct sdhci_data *data = (struct sdhci_data *)dev_get_driver_data(dev);
struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
struct rockchip_sdhc_plat *plat = dev_get_plat(dev);
struct rockchip_sdhc *prv = dev_get_priv(dev);
struct mmc_config *cfg = &plat->cfg;
struct sdhci_host *host = &prv->host;
struct clk clk;
int ret;
host->max_clk = cfg->f_max;
ret = clk_get_by_index(dev, 0, &clk);
if (!ret) {
ret = clk_set_rate(&clk, host->max_clk);
if (IS_ERR_VALUE(ret))
printf("%s clk set rate fail!\n", __func__);
} else {
printf("%s fail to get clk\n", __func__);
}
prv->emmc_clk = clk;
prv->dev = dev;
if (data->get_phy) {
ret = data->get_phy(dev);
if (ret)
return ret;
}
if (data->emmc_phy_init) {
ret = data->emmc_phy_init(dev);
if (ret)
return ret;
}
host->ops = &rockchip_sdhci_ops;
host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD;
host->mmc = &plat->mmc;
host->mmc->priv = &prv->host;
host->mmc->dev = dev;
upriv->mmc = host->mmc;
ret = sdhci_setup_cfg(cfg, host, cfg->f_max, EMMC_MIN_FREQ);
if (ret)
return ret;
return sdhci_probe(dev);
}
static int rockchip_sdhci_of_to_plat(struct udevice *dev)
{
struct rockchip_sdhc_plat *plat = dev_get_plat(dev);
struct sdhci_host *host = dev_get_priv(dev);
struct mmc_config *cfg = &plat->cfg;
int ret;
host->name = dev->name;
host->ioaddr = dev_read_addr_ptr(dev);
ret = mmc_of_parse(dev, cfg);
if (ret)
return ret;
return 0;
}
static int rockchip_sdhci_bind(struct udevice *dev)
{
struct rockchip_sdhc_plat *plat = dev_get_plat(dev);
return sdhci_bind(dev, &plat->mmc, &plat->cfg);
}
static const struct sdhci_data rk3399_data = {
.emmc_set_clock = rk3399_sdhci_emmc_set_clock,
.get_phy = rk3399_emmc_get_phy,
.emmc_phy_init = rk3399_emmc_phy_init,
};
static const struct sdhci_data rk3568_data = {
.emmc_set_clock = rk3568_sdhci_emmc_set_clock,
.get_phy = rk3568_emmc_get_phy,
.emmc_phy_init = rk3568_emmc_phy_init,
};
static const struct udevice_id sdhci_ids[] = {
{
.compatible = "arasan,sdhci-5.1",
.data = (ulong)&rk3399_data,
},
{
.compatible = "rockchip,rk3568-dwcmshc",
.data = (ulong)&rk3568_data,
},
{ }
};
U_BOOT_DRIVER(arasan_sdhci_drv) = {
.name = "rockchip_sdhci_5_1",
.id = UCLASS_MMC,
.of_match = sdhci_ids,
.of_to_plat = rockchip_sdhci_of_to_plat,
.ops = &sdhci_ops,
.bind = rockchip_sdhci_bind,
.probe = rockchip_sdhci_probe,
.priv_auto = sizeof(struct rockchip_sdhc),
.plat_auto = sizeof(struct rockchip_sdhc_plat),
};
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