u-boot/drivers/mmc/zynq_sdhci.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2013 - 2015 Xilinx, Inc.
*
* Xilinx Zynq SD Host Controller Interface
*/
#include <clk.h>
#include <common.h>
#include <dm.h>
#include <fdtdec.h>
#include "mmc_private.h"
#include <linux/libfdt.h>
#include <malloc.h>
#include <sdhci.h>
#include <zynqmp_tap_delay.h>
DECLARE_GLOBAL_DATA_PTR;
struct arasan_sdhci_plat {
struct mmc_config cfg;
struct mmc mmc;
unsigned int f_max;
};
struct arasan_sdhci_priv {
struct sdhci_host *host;
u8 deviceid;
u8 bank;
u8 no_1p8;
};
#if defined(CONFIG_ARCH_ZYNQMP)
#define MMC_HS200_BUS_SPEED 5
static const u8 mode2timing[] = {
[MMC_LEGACY] = UHS_SDR12_BUS_SPEED,
[SD_LEGACY] = UHS_SDR12_BUS_SPEED,
[MMC_HS] = HIGH_SPEED_BUS_SPEED,
[SD_HS] = HIGH_SPEED_BUS_SPEED,
[MMC_HS_52] = HIGH_SPEED_BUS_SPEED,
[MMC_DDR_52] = HIGH_SPEED_BUS_SPEED,
[UHS_SDR12] = UHS_SDR12_BUS_SPEED,
[UHS_SDR25] = UHS_SDR25_BUS_SPEED,
[UHS_SDR50] = UHS_SDR50_BUS_SPEED,
[UHS_DDR50] = UHS_DDR50_BUS_SPEED,
[UHS_SDR104] = UHS_SDR104_BUS_SPEED,
[MMC_HS_200] = MMC_HS200_BUS_SPEED,
};
#define SDHCI_TUNING_LOOP_COUNT 40
static void arasan_zynqmp_dll_reset(struct sdhci_host *host, u8 deviceid)
{
u16 clk;
unsigned long timeout;
clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
clk &= ~(SDHCI_CLOCK_CARD_EN);
sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
/* Issue DLL Reset */
zynqmp_dll_reset(deviceid);
/* Wait max 20 ms */
timeout = 100;
while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
& SDHCI_CLOCK_INT_STABLE)) {
if (timeout == 0) {
dev_err(mmc_dev(host->mmc),
": Internal clock never stabilised.\n");
return;
}
timeout--;
udelay(1000);
}
clk |= SDHCI_CLOCK_CARD_EN;
sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
}
static int arasan_sdhci_execute_tuning(struct mmc *mmc, u8 opcode)
{
struct mmc_cmd cmd;
struct mmc_data data;
u32 ctrl;
struct sdhci_host *host;
struct arasan_sdhci_priv *priv = dev_get_priv(mmc->dev);
char tuning_loop_counter = SDHCI_TUNING_LOOP_COUNT;
u8 deviceid;
debug("%s\n", __func__);
host = priv->host;
deviceid = priv->deviceid;
ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
ctrl |= SDHCI_CTRL_EXEC_TUNING;
sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
mdelay(1);
arasan_zynqmp_dll_reset(host, deviceid);
sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_INT_ENABLE);
sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_SIGNAL_ENABLE);
do {
cmd.cmdidx = opcode;
cmd.resp_type = MMC_RSP_R1;
cmd.cmdarg = 0;
data.blocksize = 64;
data.blocks = 1;
data.flags = MMC_DATA_READ;
if (tuning_loop_counter-- == 0)
break;
if (cmd.cmdidx == MMC_CMD_SEND_TUNING_BLOCK_HS200 &&
mmc->bus_width == 8)
data.blocksize = 128;
sdhci_writew(host, SDHCI_MAKE_BLKSZ(SDHCI_DEFAULT_BOUNDARY_ARG,
data.blocksize),
SDHCI_BLOCK_SIZE);
sdhci_writew(host, data.blocks, SDHCI_BLOCK_COUNT);
sdhci_writew(host, SDHCI_TRNS_READ, SDHCI_TRANSFER_MODE);
mmc_send_cmd(mmc, &cmd, NULL);
ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
if (cmd.cmdidx == MMC_CMD_SEND_TUNING_BLOCK)
udelay(1);
} while (ctrl & SDHCI_CTRL_EXEC_TUNING);
if (tuning_loop_counter < 0) {
ctrl &= ~SDHCI_CTRL_TUNED_CLK;
sdhci_writel(host, ctrl, SDHCI_HOST_CONTROL2);
}
if (!(ctrl & SDHCI_CTRL_TUNED_CLK)) {
printf("%s:Tuning failed\n", __func__);
return -1;
}
udelay(1);
arasan_zynqmp_dll_reset(host, deviceid);
/* 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 0;
}
static void arasan_sdhci_set_tapdelay(struct sdhci_host *host)
{
struct arasan_sdhci_priv *priv = dev_get_priv(host->mmc->dev);
struct mmc *mmc = (struct mmc *)host->mmc;
u8 uhsmode;
uhsmode = mode2timing[mmc->selected_mode];
if (uhsmode >= UHS_SDR25_BUS_SPEED)
arasan_zynqmp_set_tapdelay(priv->deviceid, uhsmode,
priv->bank);
}
static void arasan_sdhci_set_control_reg(struct sdhci_host *host)
{
struct mmc *mmc = (struct mmc *)host->mmc;
u32 reg;
if (!IS_SD(mmc))
return;
if (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);
}
if (mmc->selected_mode > SD_HS &&
mmc->selected_mode <= UHS_DDR50)
sdhci_set_uhs_timing(host);
}
#endif
#if defined(CONFIG_DM_MMC) && defined(CONFIG_ARCH_ZYNQMP)
const struct sdhci_ops arasan_ops = {
.platform_execute_tuning = &arasan_sdhci_execute_tuning,
.set_delay = &arasan_sdhci_set_tapdelay,
.set_control_reg = &arasan_sdhci_set_control_reg,
};
#endif
static int arasan_sdhci_probe(struct udevice *dev)
{
struct arasan_sdhci_plat *plat = dev_get_platdata(dev);
struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
struct arasan_sdhci_priv *priv = dev_get_priv(dev);
struct sdhci_host *host;
struct clk clk;
unsigned long clock;
int ret;
host = priv->host;
ret = clk_get_by_index(dev, 0, &clk);
if (ret < 0) {
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;
}
debug("%s: CLK %ld\n", __func__, clock);
ret = clk_enable(&clk);
if (ret && ret != -ENOSYS) {
dev_err(dev, "failed to enable clock\n");
return ret;
}
host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD |
SDHCI_QUIRK_BROKEN_R1B;
#ifdef CONFIG_ZYNQ_HISPD_BROKEN
host->quirks |= SDHCI_QUIRK_BROKEN_HISPD_MODE;
#endif
if (priv->no_1p8)
host->quirks |= SDHCI_QUIRK_NO_1_8_V;
host->max_clk = clock;
host->mmc = &plat->mmc;
host->mmc->dev = dev;
host->mmc->priv = host;
ret = sdhci_setup_cfg(&plat->cfg, host, plat->f_max,
CONFIG_ZYNQ_SDHCI_MIN_FREQ);
if (ret)
return ret;
upriv->mmc = host->mmc;
return sdhci_probe(dev);
}
static int arasan_sdhci_ofdata_to_platdata(struct udevice *dev)
{
struct arasan_sdhci_plat *plat = dev_get_platdata(dev);
struct arasan_sdhci_priv *priv = dev_get_priv(dev);
priv->host = calloc(1, sizeof(struct sdhci_host));
if (!priv->host)
return -1;
priv->host->name = dev->name;
#if defined(CONFIG_DM_MMC) && defined(CONFIG_ARCH_ZYNQMP)
priv->host->ops = &arasan_ops;
#endif
priv->host->ioaddr = (void *)dev_read_addr(dev);
if (IS_ERR(priv->host->ioaddr))
return PTR_ERR(priv->host->ioaddr);
priv->deviceid = dev_read_u32_default(dev, "xlnx,device_id", -1);
priv->bank = dev_read_u32_default(dev, "xlnx,mio_bank", -1);
priv->no_1p8 = dev_read_bool(dev, "no-1-8-v");
plat->f_max = dev_read_u32_default(dev, "max-frequency",
CONFIG_ZYNQ_SDHCI_MAX_FREQ);
return 0;
}
static int arasan_sdhci_bind(struct udevice *dev)
{
struct arasan_sdhci_plat *plat = dev_get_platdata(dev);
return sdhci_bind(dev, &plat->mmc, &plat->cfg);
}
static const struct udevice_id arasan_sdhci_ids[] = {
{ .compatible = "arasan,sdhci-8.9a" },
{ }
};
U_BOOT_DRIVER(arasan_sdhci_drv) = {
.name = "arasan_sdhci",
.id = UCLASS_MMC,
.of_match = arasan_sdhci_ids,
.ofdata_to_platdata = arasan_sdhci_ofdata_to_platdata,
.ops = &sdhci_ops,
.bind = arasan_sdhci_bind,
.probe = arasan_sdhci_probe,
.priv_auto_alloc_size = sizeof(struct arasan_sdhci_priv),
.platdata_auto_alloc_size = sizeof(struct arasan_sdhci_plat),
};