On Wed 13 May 2020 at 14:04, Ulf Hansson <ulf.hansson@xxxxxxxxxx> wrote:
> On Tue, 12 May 2020 at 22:42, Martin Blumenstingl
> <martin.blumenstingl@xxxxxxxxxxxxxx> wrote:
>>
>> The SDHC MMC host controller on Amlogic SoCs provides an eMMC and MMC
>> card interface with 1/4/8-bit bus width.
>> It supports eMMC spec 4.4x/4.5x including HS200 (up to 100MHz clock).
>>
>> The public S805 datasheet [0] contains a short documentation about the
>> registers. Unfortunately it does not describe how to use the registers
>> to make the hardware work. Thus this driver is based on reading (and
>> understanding) the Amlogic 3.10 GPL kernel code.
>>
>> Some hardware details are not easy to see. Jianxin Pan was kind enough
>> to answer my questions:
>> The hardware has built-in busy timeout support. The maximum timeout is
>> 30 seconds. This is only documented in Amlogic's internal
>> documentation.
>>
>> The controller only works with very specific clock configurations. The
>> details are not part of the public datasheet. In my own words the
>> supported configurations are:
>> - 399.812kHz: clkin = 850MHz div = 2126 sd_rx_phase = 63
>> - 1MHz: clkin = 850MHz div = 850 sd_rx_phase = 55
>> - 5.986MHz: clkin = 850MHz div = 142 sd_rx_phase = 24
>> - 25MHz: clkin = 850MHz div = 34 sd_rx_phase = 15
>> - 47.222MHz: clkin = 850MHz div = 18 sd_rx_phase = 11/15 (SDR50/HS)
>> - 53.125MHz: clkin = 850MHz div = 16 sd_rx_phase = (tuning)
>> - 70.833MHz: clkin = 850MHz div = 12 sd_rx_phase = (tuning)
>> - 85MHz: clkin = 850MHz div = 10 sd_rx_phase = (tuning)
>> - 94.44MHz: clkin = 850MHz div = 9 sd_rx_phase = (tuning)
>> - 106.25MHz: clkin = 850MHz div = 8 sd_rx_phase = (tuning)
>> - 127.5MHz: clkin = 1275MHz div = 10 sd_rx_phase = (tuning)
>> - 141.667MHz: clkin = 850MHz div = 6 sd_rx_phase = (tuning)
>> - 159.375MHz: clkin = 1275MHz div = 8 sd_rx_phase = (tuning)
>> - 212.5MHz: clkin = 1275MHz div = 6 sd_rx_phase = (tuning)
>> - (sd_tx_phase is always 1, 94.44MHz is not listed in the datasheet
>> but this is what the 3.10 BSP kernel on Odroid-C1 actually uses)
>>
>> NOTE: CMD23 support is disabled for now because it results in command
>> timeouts and thus decreases read performance.
>>
>> Tested-by: Wei Wang <lnykww@xxxxxxxxx>
>> Tested-by: Xin Yin <yinxin_1989@xxxxxxxxxx>
>> Reviewed-by: Xin Yin <yinxin_1989@xxxxxxxxxx>
>> Tested-by: Anand Moon <linux.amoon@xxxxxxxxx>
>> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
>
> This looks good to me, however I am awaiting a reviewed-by tag from
> Jerome, to make sure the clock implementation turn out as agreed upon.
Thx !
Reviewed-by: Jerome Brunet <jbrunet@xxxxxxxxxxxx>
>
> Kind regards
> Uffe
>
>> ---
>> drivers/mmc/host/Kconfig | 14 +
>> drivers/mmc/host/Makefile | 1 +
>> drivers/mmc/host/meson-mx-sdhc-clkc.c | 158 +++++
>> drivers/mmc/host/meson-mx-sdhc.c | 907 ++++++++++++++++++++++++++
>> drivers/mmc/host/meson-mx-sdhc.h | 141 ++++
>> 5 files changed, 1221 insertions(+)
>> create mode 100644 drivers/mmc/host/meson-mx-sdhc-clkc.c
>> create mode 100644 drivers/mmc/host/meson-mx-sdhc.c
>> create mode 100644 drivers/mmc/host/meson-mx-sdhc.h
>>
>> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
>> index 462b5352fea7..df3fc572f842 100644
>> --- a/drivers/mmc/host/Kconfig
>> +++ b/drivers/mmc/host/Kconfig
>> @@ -405,6 +405,20 @@ config MMC_MESON_GX
>>
>> If you have a controller with this interface, say Y here.
>>
>> +config MMC_MESON_MX_SDHC
>> + tristate "Amlogic Meson SDHC Host Controller support"
>> + depends on (ARM && ARCH_MESON) || COMPILE_TEST
>> + depends on COMMON_CLK
>> + depends on OF
>> + help
>> + This selects support for the SDHC Host Controller on
>> + Amlogic Meson6, Meson8, Meson8b and Meson8m2 SoCs.
>> + The controller supports the SD/SDIO Spec 3.x and eMMC Spec 4.5x
>> + with 1, 4, and 8 bit bus widths.
>> +
>> + If you have a controller with this interface, say Y or M here.
>> + If unsure, say N.
>> +
>> config MMC_MESON_MX_SDIO
>> tristate "Amlogic Meson6/Meson8/Meson8b SD/MMC Host Controller support"
>> depends on ARCH_MESON || COMPILE_TEST
>> diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
>> index b929ef941208..8bcb420e071c 100644
>> --- a/drivers/mmc/host/Makefile
>> +++ b/drivers/mmc/host/Makefile
>> @@ -68,6 +68,7 @@ obj-$(CONFIG_MMC_VUB300) += vub300.o
>> obj-$(CONFIG_MMC_USHC) += ushc.o
>> obj-$(CONFIG_MMC_WMT) += wmt-sdmmc.o
>> obj-$(CONFIG_MMC_MESON_GX) += meson-gx-mmc.o
>> +obj-$(CONFIG_MMC_MESON_MX_SDHC) += meson-mx-sdhc-clkc.o meson-mx-sdhc.o
>> obj-$(CONFIG_MMC_MESON_MX_SDIO) += meson-mx-sdio.o
>> obj-$(CONFIG_MMC_MOXART) += moxart-mmc.o
>> obj-$(CONFIG_MMC_SUNXI) += sunxi-mmc.o
>> diff --git a/drivers/mmc/host/meson-mx-sdhc-clkc.c b/drivers/mmc/host/meson-mx-sdhc-clkc.c
>> new file mode 100644
>> index 000000000000..ab0d6c68a078
>> --- /dev/null
>> +++ b/drivers/mmc/host/meson-mx-sdhc-clkc.c
>> @@ -0,0 +1,158 @@
>> +// SPDX-License-Identifier: GPL-2.0+
>> +/*
>> + * Amlogic Meson SDHC clock controller
>> + *
>> + * Copyright (C) 2020 Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
>> + */
>> +
>> +#include <linux/clk.h>
>> +#include <linux/clk-provider.h>
>> +#include <linux/device.h>
>> +#include <linux/platform_device.h>
>> +
>> +#include "meson-mx-sdhc.h"
>> +
>> +#define MESON_SDHC_NUM_BUILTIN_CLKS 6
>> +
>> +struct meson_mx_sdhc_clkc {
>> + struct clk_mux src_sel;
>> + struct clk_divider div;
>> + struct clk_gate mod_clk_en;
>> + struct clk_gate tx_clk_en;
>> + struct clk_gate rx_clk_en;
>> + struct clk_gate sd_clk_en;
>> +};
>> +
>> +static const struct clk_parent_data meson_mx_sdhc_src_sel_parents[4] = {
>> + { .fw_name = "clkin0" },
>> + { .fw_name = "clkin1" },
>> + { .fw_name = "clkin2" },
>> + { .fw_name = "clkin3" },
>> +};
>> +
>> +static const struct clk_div_table meson_mx_sdhc_div_table[] = {
>> + { .div = 6, .val = 5, },
>> + { .div = 8, .val = 7, },
>> + { .div = 9, .val = 8, },
>> + { .div = 10, .val = 9, },
>> + { .div = 12, .val = 11, },
>> + { .div = 16, .val = 15, },
>> + { .div = 18, .val = 17, },
>> + { .div = 34, .val = 33, },
>> + { .div = 142, .val = 141, },
>> + { .div = 850, .val = 849, },
>> + { .div = 2126, .val = 2125, },
>> + { .div = 4096, .val = 4095, },
>> + { /* sentinel */ }
>> +};
>> +
>> +static int meson_mx_sdhc_clk_hw_register(struct device *dev,
>> + const char *name_suffix,
>> + const struct clk_parent_data *parents,
>> + unsigned int num_parents,
>> + const struct clk_ops *ops,
>> + struct clk_hw *hw)
>> +{
>> + struct clk_init_data init = { 0 };
>> + char clk_name[32];
>> +
>> + snprintf(clk_name, sizeof(clk_name), "%s#%s", dev_name(dev),
>> + name_suffix);
>> +
>> + init.name = clk_name;
>> + init.ops = ops;
>> + init.flags = CLK_SET_RATE_PARENT;
>> + init.parent_data = parents;
>> + init.num_parents = num_parents;
>> +
>> + hw->init = &init;
>> +
>> + return devm_clk_hw_register(dev, hw);
>> +}
>> +
>> +static int meson_mx_sdhc_gate_clk_hw_register(struct device *dev,
>> + const char *name_suffix,
>> + struct clk_hw *parent,
>> + struct clk_hw *hw)
>> +{
>> + struct clk_parent_data parent_data = { .hw = parent };
>> +
>> + return meson_mx_sdhc_clk_hw_register(dev, name_suffix, &parent_data, 1,
>> + &clk_gate_ops, hw);
>> +}
>> +
>> +int meson_mx_sdhc_register_clkc(struct device *dev, void __iomem *base,
>> + struct clk_bulk_data *clk_bulk_data)
>> +{
>> + struct clk_parent_data div_parent = { 0 };
>> + struct meson_mx_sdhc_clkc *clkc_data;
>> + int ret;
>> +
>> + clkc_data = devm_kzalloc(dev, sizeof(*clkc_data), GFP_KERNEL);
>> + if (!clkc_data)
>> + return -ENOMEM;
>> +
>> + clkc_data->src_sel.reg = base + MESON_SDHC_CLKC;
>> + clkc_data->src_sel.mask = 0x3;
>> + clkc_data->src_sel.shift = 16;
>> + ret = meson_mx_sdhc_clk_hw_register(dev, "src_sel",
>> + meson_mx_sdhc_src_sel_parents, 4,
>> + &clk_mux_ops,
>> + &clkc_data->src_sel.hw);
>> + if (ret)
>> + return ret;
>> +
>> + clkc_data->div.reg = base + MESON_SDHC_CLKC;
>> + clkc_data->div.shift = 0;
>> + clkc_data->div.width = 12;
>> + clkc_data->div.table = meson_mx_sdhc_div_table;
>> + div_parent.hw = &clkc_data->src_sel.hw;
>> + ret = meson_mx_sdhc_clk_hw_register(dev, "div", &div_parent, 1,
>> + &clk_divider_ops,
>> + &clkc_data->div.hw);
>> + if (ret)
>> + return ret;
>> +
>> + clkc_data->mod_clk_en.reg = base + MESON_SDHC_CLKC;
>> + clkc_data->mod_clk_en.bit_idx = 15;
>> + ret = meson_mx_sdhc_gate_clk_hw_register(dev, "mod_clk_on",
>> + &clkc_data->div.hw,
>> + &clkc_data->mod_clk_en.hw);
>> + if (ret)
>> + return ret;
>> +
>> + clkc_data->tx_clk_en.reg = base + MESON_SDHC_CLKC;
>> + clkc_data->tx_clk_en.bit_idx = 14;
>> + ret = meson_mx_sdhc_gate_clk_hw_register(dev, "tx_clk_on",
>> + &clkc_data->div.hw,
>> + &clkc_data->tx_clk_en.hw);
>> + if (ret)
>> + return ret;
>> +
>> + clkc_data->rx_clk_en.reg = base + MESON_SDHC_CLKC;
>> + clkc_data->rx_clk_en.bit_idx = 13;
>> + ret = meson_mx_sdhc_gate_clk_hw_register(dev, "rx_clk_on",
>> + &clkc_data->div.hw,
>> + &clkc_data->rx_clk_en.hw);
>> + if (ret)
>> + return ret;
>> +
>> + clkc_data->sd_clk_en.reg = base + MESON_SDHC_CLKC;
>> + clkc_data->sd_clk_en.bit_idx = 12;
>> + ret = meson_mx_sdhc_gate_clk_hw_register(dev, "sd_clk_on",
>> + &clkc_data->div.hw,
>> + &clkc_data->sd_clk_en.hw);
>> + if (ret)
>> + return ret;
>> +
>> + /*
>> + * TODO: Replace clk_hw.clk with devm_clk_hw_get_clk() once that is
>> + * available.
>> + */
>> + clk_bulk_data[0].clk = clkc_data->mod_clk_en.hw.clk;
>> + clk_bulk_data[1].clk = clkc_data->sd_clk_en.hw.clk;
>> + clk_bulk_data[2].clk = clkc_data->tx_clk_en.hw.clk;
>> + clk_bulk_data[3].clk = clkc_data->rx_clk_en.hw.clk;
>> +
>> + return 0;
>> +}
>> diff --git a/drivers/mmc/host/meson-mx-sdhc.c b/drivers/mmc/host/meson-mx-sdhc.c
>> new file mode 100644
>> index 000000000000..5c00958d7754
>> --- /dev/null
>> +++ b/drivers/mmc/host/meson-mx-sdhc.c
>> @@ -0,0 +1,907 @@
>> +// SPDX-License-Identifier: GPL-2.0+
>> +/*
>> + * Amlogic Meson6/Meson8/Meson8b/Meson8m2 SDHC MMC host controller driver.
>> + *
>> + * Copyright (C) 2020 Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
>> + */
>> +
>> +#include <linux/clk.h>
>> +#include <linux/device.h>
>> +#include <linux/dma-mapping.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/iopoll.h>
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/property.h>
>> +#include <linux/regmap.h>
>> +#include <linux/regulator/consumer.h>
>> +#include <linux/types.h>
>> +
>> +#include <linux/mmc/host.h>
>> +#include <linux/mmc/mmc.h>
>> +#include <linux/mmc/sdio.h>
>> +#include <linux/mmc/slot-gpio.h>
>> +
>> +#include "meson-mx-sdhc.h"
>> +
>> +#define MESON_SDHC_NUM_BULK_CLKS 4
>> +#define MESON_SDHC_MAX_BLK_SIZE 512
>> +#define MESON_SDHC_NUM_TUNING_TRIES 10
>> +
>> +#define MESON_SDHC_WAIT_CMD_READY_SLEEP_US 1
>> +#define MESON_SDHC_WAIT_CMD_READY_TIMEOUT_US 100000
>> +#define MESON_SDHC_WAIT_BEFORE_SEND_SLEEP_US 1
>> +#define MESON_SDHC_WAIT_BEFORE_SEND_TIMEOUT_US 200
>> +
>> +struct meson_mx_sdhc_data {
>> + void (*init_hw)(struct mmc_host *mmc);
>> + void (*set_pdma)(struct mmc_host *mmc);
>> + void (*wait_before_send)(struct mmc_host *mmc);
>> + bool hardware_flush_all_cmds;
>> +};
>> +
>> +struct meson_mx_sdhc_host {
>> + struct mmc_host *mmc;
>> +
>> + struct mmc_request *mrq;
>> + struct mmc_command *cmd;
>> + int error;
>> +
>> + struct regmap *regmap;
>> +
>> + struct clk *pclk;
>> + struct clk *sd_clk;
>> + struct clk_bulk_data bulk_clks[MESON_SDHC_NUM_BULK_CLKS];
>> + bool bulk_clks_enabled;
>> +
>> + const struct meson_mx_sdhc_data *platform;
>> +};
>> +
>> +static const struct regmap_config meson_mx_sdhc_regmap_config = {
>> + .reg_bits = 8,
>> + .val_bits = 32,
>> + .reg_stride = 4,
>> + .max_register = MESON_SDHC_CLK2,
>> +};
>> +
>> +static void meson_mx_sdhc_hw_reset(struct mmc_host *mmc)
>> +{
>> + struct meson_mx_sdhc_host *host = mmc_priv(mmc);
>> +
>> + regmap_write(host->regmap, MESON_SDHC_SRST, MESON_SDHC_SRST_MAIN_CTRL |
>> + MESON_SDHC_SRST_RXFIFO | MESON_SDHC_SRST_TXFIFO |
>> + MESON_SDHC_SRST_DPHY_RX | MESON_SDHC_SRST_DPHY_TX |
>> + MESON_SDHC_SRST_DMA_IF);
>> + usleep_range(10, 100);
>> +
>> + regmap_write(host->regmap, MESON_SDHC_SRST, 0);
>> + usleep_range(10, 100);
>> +}
>> +
>> +static void meson_mx_sdhc_clear_fifo(struct mmc_host *mmc)
>> +{
>> + struct meson_mx_sdhc_host *host = mmc_priv(mmc);
>> + u32 stat;
>> +
>> + regmap_read(host->regmap, MESON_SDHC_STAT, &stat);
>> + if (!FIELD_GET(MESON_SDHC_STAT_RXFIFO_CNT, stat) &&
>> + !FIELD_GET(MESON_SDHC_STAT_TXFIFO_CNT, stat))
>> + return;
>> +
>> + regmap_write(host->regmap, MESON_SDHC_SRST, MESON_SDHC_SRST_RXFIFO |
>> + MESON_SDHC_SRST_TXFIFO | MESON_SDHC_SRST_MAIN_CTRL);
>> + udelay(5);
>> +
>> + regmap_read(host->regmap, MESON_SDHC_STAT, &stat);
>> + if (FIELD_GET(MESON_SDHC_STAT_RXFIFO_CNT, stat) ||
>> + FIELD_GET(MESON_SDHC_STAT_TXFIFO_CNT, stat))
>> + dev_warn(mmc_dev(host->mmc),
>> + "Failed to clear FIFOs, RX: %lu, TX: %lu\n",
>> + FIELD_GET(MESON_SDHC_STAT_RXFIFO_CNT, stat),
>> + FIELD_GET(MESON_SDHC_STAT_TXFIFO_CNT, stat));
>> +}
>> +
>> +static void meson_mx_sdhc_wait_cmd_ready(struct mmc_host *mmc)
>> +{
>> + struct meson_mx_sdhc_host *host = mmc_priv(mmc);
>> + u32 stat, esta;
>> + int ret;
>> +
>> + ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_STAT, stat,
>> + !(stat & MESON_SDHC_STAT_CMD_BUSY),
>> + MESON_SDHC_WAIT_CMD_READY_SLEEP_US,
>> + MESON_SDHC_WAIT_CMD_READY_TIMEOUT_US);
>> + if (ret) {
>> + dev_warn(mmc_dev(mmc),
>> + "Failed to poll for CMD_BUSY while processing CMD%d\n",
>> + host->cmd->opcode);
>> + meson_mx_sdhc_hw_reset(mmc);
>> + }
>> +
>> + ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_ESTA, esta,
>> + !(esta & MESON_SDHC_ESTA_11_13),
>> + MESON_SDHC_WAIT_CMD_READY_SLEEP_US,
>> + MESON_SDHC_WAIT_CMD_READY_TIMEOUT_US);
>> + if (ret) {
>> + dev_warn(mmc_dev(mmc),
>> + "Failed to poll for ESTA[13:11] while processing CMD%d\n",
>> + host->cmd->opcode);
>> + meson_mx_sdhc_hw_reset(mmc);
>> + }
>> +}
>> +
>> +static void meson_mx_sdhc_start_cmd(struct mmc_host *mmc,
>> + struct mmc_command *cmd)
>> +{
>> + struct meson_mx_sdhc_host *host = mmc_priv(mmc);
>> + u32 ictl, send;
>> + int pack_len;
>> +
>> + host->cmd = cmd;
>> +
>> + ictl = MESON_SDHC_ICTL_DATA_TIMEOUT | MESON_SDHC_ICTL_DATA_ERR_CRC |
>> + MESON_SDHC_ICTL_RXFIFO_FULL | MESON_SDHC_ICTL_TXFIFO_EMPTY |
>> + MESON_SDHC_ICTL_RESP_TIMEOUT | MESON_SDHC_ICTL_RESP_ERR_CRC;
>> +
>> + send = FIELD_PREP(MESON_SDHC_SEND_CMD_INDEX, cmd->opcode);
>> +
>> + if (cmd->data) {
>> + send |= MESON_SDHC_SEND_CMD_HAS_DATA;
>> + send |= FIELD_PREP(MESON_SDHC_SEND_TOTAL_PACK,
>> + cmd->data->blocks - 1);
>> +
>> + if (cmd->data->blksz < MESON_SDHC_MAX_BLK_SIZE)
>> + pack_len = cmd->data->blksz;
>> + else
>> + pack_len = 0;
>> +
>> + if (cmd->data->flags & MMC_DATA_WRITE)
>> + send |= MESON_SDHC_SEND_DATA_DIR;
>> +
>> + /*
>> + * If command with no data, just wait response done
>> + * interrupt(int[0]), and if command with data transfer, just
>> + * wait dma done interrupt(int[11]), don't need care about
>> + * dat0 busy or not.
>> + */
>> + if (host->platform->hardware_flush_all_cmds ||
>> + cmd->data->flags & MMC_DATA_WRITE)
>> + /* hardware flush: */
>> + ictl |= MESON_SDHC_ICTL_DMA_DONE;
>> + else
>> + /* software flush: */
>> + ictl |= MESON_SDHC_ICTL_DATA_XFER_OK;
>> + } else {
>> + pack_len = 0;
>> +
>> + ictl |= MESON_SDHC_ICTL_RESP_OK;
>> + }
>> +
>> + if (cmd->opcode == MMC_STOP_TRANSMISSION)
>> + send |= MESON_SDHC_SEND_DATA_STOP;
>> +
>> + if (cmd->flags & MMC_RSP_PRESENT)
>> + send |= MESON_SDHC_SEND_CMD_HAS_RESP;
>> +
>> + if (cmd->flags & MMC_RSP_136) {
>> + send |= MESON_SDHC_SEND_RESP_LEN;
>> + send |= MESON_SDHC_SEND_RESP_NO_CRC;
>> + }
>> +
>> + if (!(cmd->flags & MMC_RSP_CRC))
>> + send |= MESON_SDHC_SEND_RESP_NO_CRC;
>> +
>> + if (cmd->flags & MMC_RSP_BUSY)
>> + send |= MESON_SDHC_SEND_R1B;
>> +
>> + /* enable the new IRQs and mask all pending ones */
>> + regmap_write(host->regmap, MESON_SDHC_ICTL, ictl);
>> + regmap_write(host->regmap, MESON_SDHC_ISTA, MESON_SDHC_ISTA_ALL_IRQS);
>> +
>> + regmap_write(host->regmap, MESON_SDHC_ARGU, cmd->arg);
>> +
>> + regmap_update_bits(host->regmap, MESON_SDHC_CTRL,
>> + MESON_SDHC_CTRL_PACK_LEN,
>> + FIELD_PREP(MESON_SDHC_CTRL_PACK_LEN, pack_len));
>> +
>> + if (cmd->data)
>> + regmap_write(host->regmap, MESON_SDHC_ADDR,
>> + sg_dma_address(cmd->data->sg));
>> +
>> + meson_mx_sdhc_wait_cmd_ready(mmc);
>> +
>> + if (cmd->data)
>> + host->platform->set_pdma(mmc);
>> +
>> + if (host->platform->wait_before_send)
>> + host->platform->wait_before_send(mmc);
>> +
>> + regmap_write(host->regmap, MESON_SDHC_SEND, send);
>> +}
>> +
>> +static void meson_mx_sdhc_disable_clks(struct mmc_host *mmc)
>> +{
>> + struct meson_mx_sdhc_host *host = mmc_priv(mmc);
>> +
>> + if (!host->bulk_clks_enabled)
>> + return;
>> +
>> + clk_bulk_disable_unprepare(MESON_SDHC_NUM_BULK_CLKS, host->bulk_clks);
>> +
>> + host->bulk_clks_enabled = false;
>> +}
>> +
>> +static int meson_mx_sdhc_enable_clks(struct mmc_host *mmc)
>> +{
>> + struct meson_mx_sdhc_host *host = mmc_priv(mmc);
>> + int ret;
>> +
>> + if (host->bulk_clks_enabled)
>> + return 0;
>> +
>> + ret = clk_bulk_prepare_enable(MESON_SDHC_NUM_BULK_CLKS,
>> + host->bulk_clks);
>> + if (ret)
>> + return ret;
>> +
>> + host->bulk_clks_enabled = true;
>> +
>> + return 0;
>> +}
>> +
>> +static int meson_mx_sdhc_set_clk(struct mmc_host *mmc, struct mmc_ios *ios)
>> +{
>> + struct meson_mx_sdhc_host *host = mmc_priv(mmc);
>> + u32 rx_clk_phase;
>> + int ret;
>> +
>> + meson_mx_sdhc_disable_clks(mmc);
>> +
>> + if (ios->clock) {
>> + ret = clk_set_rate(host->sd_clk, ios->clock);
>> + if (ret) {
>> + dev_warn(mmc_dev(mmc),
>> + "Failed to set MMC clock to %uHz: %d\n",
>> + ios->clock, host->error);
>> + return ret;
>> + }
>> +
>> + ret = meson_mx_sdhc_enable_clks(mmc);
>> + if (ret)
>> + return ret;
>> +
>> + mmc->actual_clock = clk_get_rate(host->sd_clk);
>> +
>> + /*
>> + * according to Amlogic the following latching points are
>> + * selected with empirical values, there is no (known) formula
>> + * to calculate these.
>> + */
>> + if (mmc->actual_clock > 100000000) {
>> + rx_clk_phase = 1;
>> + } else if (mmc->actual_clock > 45000000) {
>> + if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330)
>> + rx_clk_phase = 15;
>> + else
>> + rx_clk_phase = 11;
>> + } else if (mmc->actual_clock >= 25000000) {
>> + rx_clk_phase = 15;
>> + } else if (mmc->actual_clock > 5000000) {
>> + rx_clk_phase = 23;
>> + } else if (mmc->actual_clock > 1000000) {
>> + rx_clk_phase = 55;
>> + } else {
>> + rx_clk_phase = 1061;
>> + }
>> +
>> + regmap_update_bits(host->regmap, MESON_SDHC_CLK2,
>> + MESON_SDHC_CLK2_RX_CLK_PHASE,
>> + FIELD_PREP(MESON_SDHC_CLK2_RX_CLK_PHASE,
>> + rx_clk_phase));
>> + } else {
>> + mmc->actual_clock = 0;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static void meson_mx_sdhc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
>> +{
>> + struct meson_mx_sdhc_host *host = mmc_priv(mmc);
>> + unsigned short vdd = ios->vdd;
>> +
>> + switch (ios->power_mode) {
>> + case MMC_POWER_OFF:
>> + vdd = 0;
>> + fallthrough;
>> +
>> + case MMC_POWER_UP:
>> + if (!IS_ERR(mmc->supply.vmmc)) {
>> + host->error = mmc_regulator_set_ocr(mmc,
>> + mmc->supply.vmmc,
>> + vdd);
>> + if (host->error)
>> + return;
>> + }
>> +
>> + break;
>> +
>> + case MMC_POWER_ON:
>> + break;
>> + }
>> +
>> + host->error = meson_mx_sdhc_set_clk(mmc, ios);
>> + if (host->error)
>> + return;
>> +
>> + switch (ios->bus_width) {
>> + case MMC_BUS_WIDTH_1:
>> + regmap_update_bits(host->regmap, MESON_SDHC_CTRL,
>> + MESON_SDHC_CTRL_DAT_TYPE,
>> + FIELD_PREP(MESON_SDHC_CTRL_DAT_TYPE, 0));
>> + break;
>> +
>> + case MMC_BUS_WIDTH_4:
>> + regmap_update_bits(host->regmap, MESON_SDHC_CTRL,
>> + MESON_SDHC_CTRL_DAT_TYPE,
>> + FIELD_PREP(MESON_SDHC_CTRL_DAT_TYPE, 1));
>> + break;
>> +
>> + case MMC_BUS_WIDTH_8:
>> + regmap_update_bits(host->regmap, MESON_SDHC_CTRL,
>> + MESON_SDHC_CTRL_DAT_TYPE,
>> + FIELD_PREP(MESON_SDHC_CTRL_DAT_TYPE, 2));
>> + break;
>> +
>> + default:
>> + dev_err(mmc_dev(mmc), "unsupported bus width: %d\n",
>> + ios->bus_width);
>> + host->error = -EINVAL;
>> + return;
>> + }
>> +}
>> +
>> +static int meson_mx_sdhc_map_dma(struct mmc_host *mmc, struct mmc_request *mrq)
>> +{
>> + struct mmc_data *data = mrq->data;
>> + int dma_len;
>> +
>> + if (!data)
>> + return 0;
>> +
>> + dma_len = dma_map_sg(mmc_dev(mmc), data->sg, data->sg_len,
>> + mmc_get_dma_dir(data));
>> + if (dma_len <= 0) {
>> + dev_err(mmc_dev(mmc), "dma_map_sg failed\n");
>> + return -ENOMEM;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static void meson_mx_sdhc_request(struct mmc_host *mmc, struct mmc_request *mrq)
>> +{
>> + struct meson_mx_sdhc_host *host = mmc_priv(mmc);
>> + struct mmc_command *cmd = mrq->cmd;
>> +
>> + if (!host->error)
>> + host->error = meson_mx_sdhc_map_dma(mmc, mrq);
>> +
>> + if (host->error) {
>> + cmd->error = host->error;
>> + mmc_request_done(mmc, mrq);
>> + return;
>> + }
>> +
>> + host->mrq = mrq;
>> +
>> + meson_mx_sdhc_start_cmd(mmc, mrq->cmd);
>> +}
>> +
>> +static int meson_mx_sdhc_card_busy(struct mmc_host *mmc)
>> +{
>> + struct meson_mx_sdhc_host *host = mmc_priv(mmc);
>> + u32 stat;
>> +
>> + regmap_read(host->regmap, MESON_SDHC_STAT, &stat);
>> + return FIELD_GET(MESON_SDHC_STAT_DAT3_0, stat) == 0;
>> +}
>> +
>> +static bool meson_mx_sdhc_tuning_point_matches(struct mmc_host *mmc,
>> + u32 opcode)
>> +{
>> + unsigned int i, num_matches = 0;
>> + int ret;
>> +
>> + for (i = 0; i < MESON_SDHC_NUM_TUNING_TRIES; i++) {
>> + ret = mmc_send_tuning(mmc, opcode, NULL);
>> + if (!ret)
>> + num_matches++;
>> + }
>> +
>> + return num_matches == MESON_SDHC_NUM_TUNING_TRIES;
>> +}
>> +
>> +static int meson_mx_sdhc_execute_tuning(struct mmc_host *mmc, u32 opcode)
>> +{
>> + struct meson_mx_sdhc_host *host = mmc_priv(mmc);
>> + int div, start, len, best_start, best_len;
>> + int curr_phase, old_phase, new_phase;
>> + u32 val;
>> +
>> + len = 0;
>> + start = 0;
>> + best_len = 0;
>> +
>> + regmap_read(host->regmap, MESON_SDHC_CLK2, &val);
>> + old_phase = FIELD_GET(MESON_SDHC_CLK2_RX_CLK_PHASE, val);
>> +
>> + regmap_read(host->regmap, MESON_SDHC_CLKC, &val);
>> + div = FIELD_GET(MESON_SDHC_CLKC_CLK_DIV, val);
>> +
>> + for (curr_phase = 0; curr_phase <= div; curr_phase++) {
>> + regmap_update_bits(host->regmap, MESON_SDHC_CLK2,
>> + MESON_SDHC_CLK2_RX_CLK_PHASE,
>> + FIELD_PREP(MESON_SDHC_CLK2_RX_CLK_PHASE,
>> + curr_phase));
>> +
>> + if (meson_mx_sdhc_tuning_point_matches(mmc, opcode)) {
>> + if (!len) {
>> + start = curr_phase;
>> +
>> + dev_dbg(mmc_dev(mmc),
>> + "New RX phase window starts at %u\n",
>> + start);
>> + }
>> +
>> + len++;
>> + } else {
>> + if (len > best_len) {
>> + best_start = start;
>> + best_len = len;
>> +
>> + dev_dbg(mmc_dev(mmc),
>> + "New best RX phase window: %u - %u\n",
>> + best_start, best_start + best_len);
>> + }
>> +
>> + /* reset the current window */
>> + len = 0;
>> + }
>> + }
>> +
>> + if (len > best_len)
>> + /* the last window is the best (or possibly only) window */
>> + new_phase = start + (len / 2);
>> + else if (best_len)
>> + /* there was a better window than the last */
>> + new_phase = best_start + (best_len / 2);
>> + else
>> + /* no window was found at all, reset to the original phase */
>> + new_phase = old_phase;
>> +
>> + regmap_update_bits(host->regmap, MESON_SDHC_CLK2,
>> + MESON_SDHC_CLK2_RX_CLK_PHASE,
>> + FIELD_PREP(MESON_SDHC_CLK2_RX_CLK_PHASE,
>> + new_phase));
>> +
>> + if (!len && !best_len)
>> + return -EIO;
>> +
>> + dev_dbg(mmc_dev(mmc), "Tuned RX clock phase to %u\n", new_phase);
>> +
>> + return 0;
>> +}
>> +
>> +static const struct mmc_host_ops meson_mx_sdhc_ops = {
>> + .hw_reset = meson_mx_sdhc_hw_reset,
>> + .request = meson_mx_sdhc_request,
>> + .set_ios = meson_mx_sdhc_set_ios,
>> + .card_busy = meson_mx_sdhc_card_busy,
>> + .execute_tuning = meson_mx_sdhc_execute_tuning,
>> + .get_cd = mmc_gpio_get_cd,
>> + .get_ro = mmc_gpio_get_ro,
>> +};
>> +
>> +static void meson_mx_sdhc_request_done(struct meson_mx_sdhc_host *host)
>> +{
>> + struct mmc_request *mrq = host->mrq;
>> + struct mmc_host *mmc = host->mmc;
>> +
>> + /* disable interrupts and mask all pending ones */
>> + regmap_update_bits(host->regmap, MESON_SDHC_ICTL,
>> + MESON_SDHC_ICTL_ALL_IRQS, 0);
>> + regmap_update_bits(host->regmap, MESON_SDHC_ISTA,
>> + MESON_SDHC_ISTA_ALL_IRQS, MESON_SDHC_ISTA_ALL_IRQS);
>> +
>> + host->mrq = NULL;
>> + host->cmd = NULL;
>> +
>> + mmc_request_done(mmc, mrq);
>> +}
>> +
>> +static u32 meson_mx_sdhc_read_response(struct meson_mx_sdhc_host *host, u8 idx)
>> +{
>> + u32 val;
>> +
>> + regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
>> + MESON_SDHC_PDMA_DMA_MODE, 0);
>> +
>> + regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
>> + MESON_SDHC_PDMA_PIO_RDRESP,
>> + FIELD_PREP(MESON_SDHC_PDMA_PIO_RDRESP, idx));
>> +
>> + regmap_read(host->regmap, MESON_SDHC_ARGU, &val);
>> +
>> + return val;
>> +}
>> +
>> +static irqreturn_t meson_mx_sdhc_irq(int irq, void *data)
>> +{
>> + struct meson_mx_sdhc_host *host = data;
>> + struct mmc_command *cmd = host->cmd;
>> + u32 ictl, ista;
>> +
>> + regmap_read(host->regmap, MESON_SDHC_ICTL, &ictl);
>> + regmap_read(host->regmap, MESON_SDHC_ISTA, &ista);
>> +
>> + if (!(ictl & ista))
>> + return IRQ_NONE;
>> +
>> + if (ista & MESON_SDHC_ISTA_RXFIFO_FULL ||
>> + ista & MESON_SDHC_ISTA_TXFIFO_EMPTY)
>> + cmd->error = -EIO;
>> + else if (ista & MESON_SDHC_ISTA_RESP_ERR_CRC)
>> + cmd->error = -EILSEQ;
>> + else if (ista & MESON_SDHC_ISTA_RESP_TIMEOUT)
>> + cmd->error = -ETIMEDOUT;
>> +
>> + if (cmd->data) {
>> + if (ista & MESON_SDHC_ISTA_DATA_ERR_CRC)
>> + cmd->data->error = -EILSEQ;
>> + else if (ista & MESON_SDHC_ISTA_DATA_TIMEOUT)
>> + cmd->data->error = -ETIMEDOUT;
>> + }
>> +
>> + if (cmd->error || (cmd->data && cmd->data->error))
>> + dev_dbg(mmc_dev(host->mmc), "CMD%d error, ISTA: 0x%08x\n",
>> + cmd->opcode, ista);
>> +
>> + return IRQ_WAKE_THREAD;
>> +}
>> +
>> +static irqreturn_t meson_mx_sdhc_irq_thread(int irq, void *irq_data)
>> +{
>> + struct meson_mx_sdhc_host *host = irq_data;
>> + struct mmc_command *cmd;
>> + u32 val;
>> +
>> + cmd = host->cmd;
>> + if (WARN_ON(!cmd))
>> + return IRQ_HANDLED;
>> +
>> + if (cmd->data && !cmd->data->error) {
>> + if (!host->platform->hardware_flush_all_cmds &&
>> + cmd->data->flags & MMC_DATA_READ) {
>> + meson_mx_sdhc_wait_cmd_ready(host->mmc);
>> +
>> + val = FIELD_PREP(MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH,
>> + 2);
>> + regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
>> + MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH,
>> + val);
>> + }
>> +
>> + dma_unmap_sg(mmc_dev(host->mmc), cmd->data->sg,
>> + cmd->data->sg_len, mmc_get_dma_dir(cmd->data));
>> +
>> + cmd->data->bytes_xfered = cmd->data->blksz * cmd->data->blocks;
>> + }
>> +
>> + meson_mx_sdhc_wait_cmd_ready(host->mmc);
>> +
>> + if (cmd->flags & MMC_RSP_136) {
>> + cmd->resp[0] = meson_mx_sdhc_read_response(host, 4);
>> + cmd->resp[1] = meson_mx_sdhc_read_response(host, 3);
>> + cmd->resp[2] = meson_mx_sdhc_read_response(host, 2);
>> + cmd->resp[3] = meson_mx_sdhc_read_response(host, 1);
>> + } else {
>> + cmd->resp[0] = meson_mx_sdhc_read_response(host, 0);
>> + }
>> +
>> + if (cmd->error == -EIO || cmd->error == -ETIMEDOUT)
>> + meson_mx_sdhc_hw_reset(host->mmc);
>> + else if (cmd->data)
>> + /*
>> + * Clear the FIFOs after completing data transfers to prevent
>> + * corrupting data on write access. It's not clear why this is
>> + * needed (for reads and writes), but it mimics what the BSP
>> + * kernel did.
>> + */
>> + meson_mx_sdhc_clear_fifo(host->mmc);
>> +
>> + meson_mx_sdhc_request_done(host);
>> +
>> + return IRQ_HANDLED;
>> +}
>> +
>> +static void meson_mx_sdhc_init_hw_meson8(struct mmc_host *mmc)
>> +{
>> + struct meson_mx_sdhc_host *host = mmc_priv(mmc);
>> +
>> + regmap_write(host->regmap, MESON_SDHC_MISC,
>> + FIELD_PREP(MESON_SDHC_MISC_TXSTART_THRES, 7) |
>> + FIELD_PREP(MESON_SDHC_MISC_WCRC_ERR_PATT, 5) |
>> + FIELD_PREP(MESON_SDHC_MISC_WCRC_OK_PATT, 2));
>> +
>> + regmap_write(host->regmap, MESON_SDHC_ENHC,
>> + FIELD_PREP(MESON_SDHC_ENHC_RXFIFO_TH, 63) |
>> + MESON_SDHC_ENHC_MESON6_DMA_WR_RESP |
>> + FIELD_PREP(MESON_SDHC_ENHC_MESON6_RX_TIMEOUT, 255) |
>> + FIELD_PREP(MESON_SDHC_ENHC_SDIO_IRQ_PERIOD, 12));
>> +};
>> +
>> +static void meson_mx_sdhc_set_pdma_meson8(struct mmc_host *mmc)
>> +{
>> + struct meson_mx_sdhc_host *host = mmc_priv(mmc);
>> +
>> + if (host->cmd->data->flags & MMC_DATA_WRITE)
>> + regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
>> + MESON_SDHC_PDMA_DMA_MODE |
>> + MESON_SDHC_PDMA_RD_BURST |
>> + MESON_SDHC_PDMA_TXFIFO_FILL,
>> + MESON_SDHC_PDMA_DMA_MODE |
>> + FIELD_PREP(MESON_SDHC_PDMA_RD_BURST, 31) |
>> + MESON_SDHC_PDMA_TXFIFO_FILL);
>> + else
>> + regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
>> + MESON_SDHC_PDMA_DMA_MODE |
>> + MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH,
>> + MESON_SDHC_PDMA_DMA_MODE |
>> + FIELD_PREP(MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH,
>> + 1));
>> +
>> + if (host->cmd->data->flags & MMC_DATA_WRITE)
>> + regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
>> + MESON_SDHC_PDMA_RD_BURST,
>> + FIELD_PREP(MESON_SDHC_PDMA_RD_BURST, 15));
>> +}
>> +
>> +static void meson_mx_sdhc_wait_before_send_meson8(struct mmc_host *mmc)
>> +{
>> + struct meson_mx_sdhc_host *host = mmc_priv(mmc);
>> + u32 val;
>> + int ret;
>> +
>> + ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_ESTA, val,
>> + val == 0,
>> + MESON_SDHC_WAIT_BEFORE_SEND_SLEEP_US,
>> + MESON_SDHC_WAIT_BEFORE_SEND_TIMEOUT_US);
>> + if (ret)
>> + dev_warn(mmc_dev(mmc),
>> + "Failed to wait for ESTA to clear: 0x%08x\n", val);
>> +
>> + if (host->cmd->data && host->cmd->data->flags & MMC_DATA_WRITE) {
>> + ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_STAT,
>> + val, val & MESON_SDHC_STAT_TXFIFO_CNT,
>> + MESON_SDHC_WAIT_BEFORE_SEND_SLEEP_US,
>> + MESON_SDHC_WAIT_BEFORE_SEND_TIMEOUT_US);
>> + if (ret)
>> + dev_warn(mmc_dev(mmc),
>> + "Failed to wait for TX FIFO to fill\n");
>> + }
>> +}
>> +
>> +static void meson_mx_sdhc_init_hw_meson8m2(struct mmc_host *mmc)
>> +{
>> + struct meson_mx_sdhc_host *host = mmc_priv(mmc);
>> +
>> + regmap_write(host->regmap, MESON_SDHC_MISC,
>> + FIELD_PREP(MESON_SDHC_MISC_TXSTART_THRES, 6) |
>> + FIELD_PREP(MESON_SDHC_MISC_WCRC_ERR_PATT, 5) |
>> + FIELD_PREP(MESON_SDHC_MISC_WCRC_OK_PATT, 2));
>> +
>> + regmap_write(host->regmap, MESON_SDHC_ENHC,
>> + FIELD_PREP(MESON_SDHC_ENHC_RXFIFO_TH, 64) |
>> + FIELD_PREP(MESON_SDHC_ENHC_MESON8M2_DEBUG, 1) |
>> + MESON_SDHC_ENHC_MESON8M2_WRRSP_MODE |
>> + FIELD_PREP(MESON_SDHC_ENHC_SDIO_IRQ_PERIOD, 12));
>> +}
>> +
>> +static void meson_mx_sdhc_set_pdma_meson8m2(struct mmc_host *mmc)
>> +{
>> + struct meson_mx_sdhc_host *host = mmc_priv(mmc);
>> +
>> + regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
>> + MESON_SDHC_PDMA_DMA_MODE, MESON_SDHC_PDMA_DMA_MODE);
>> +}
>> +
>> +static void meson_mx_sdhc_init_hw(struct mmc_host *mmc)
>> +{
>> + struct meson_mx_sdhc_host *host = mmc_priv(mmc);
>> +
>> + meson_mx_sdhc_hw_reset(mmc);
>> +
>> + regmap_write(host->regmap, MESON_SDHC_CTRL,
>> + FIELD_PREP(MESON_SDHC_CTRL_RX_PERIOD, 0xf) |
>> + FIELD_PREP(MESON_SDHC_CTRL_RX_TIMEOUT, 0x7f) |
>> + FIELD_PREP(MESON_SDHC_CTRL_RX_ENDIAN, 0x7) |
>> + FIELD_PREP(MESON_SDHC_CTRL_TX_ENDIAN, 0x7));
>> +
>> + /*
>> + * start with a valid divider and enable the memory (un-setting
>> + * MESON_SDHC_CLKC_MEM_PWR_OFF).
>> + */
>> + regmap_write(host->regmap, MESON_SDHC_CLKC, MESON_SDHC_CLKC_CLK_DIV);
>> +
>> + regmap_write(host->regmap, MESON_SDHC_CLK2,
>> + FIELD_PREP(MESON_SDHC_CLK2_SD_CLK_PHASE, 1));
>> +
>> + regmap_write(host->regmap, MESON_SDHC_PDMA,
>> + MESON_SDHC_PDMA_DMA_URGENT |
>> + FIELD_PREP(MESON_SDHC_PDMA_WR_BURST, 7) |
>> + FIELD_PREP(MESON_SDHC_PDMA_TXFIFO_TH, 49) |
>> + FIELD_PREP(MESON_SDHC_PDMA_RD_BURST, 15) |
>> + FIELD_PREP(MESON_SDHC_PDMA_RXFIFO_TH, 7));
>> +
>> + /* some initialization bits depend on the SoC: */
>> + host->platform->init_hw(mmc);
>> +
>> + /* disable and mask all interrupts: */
>> + regmap_write(host->regmap, MESON_SDHC_ICTL, 0);
>> + regmap_write(host->regmap, MESON_SDHC_ISTA, MESON_SDHC_ISTA_ALL_IRQS);
>> +}
>> +
>> +static int meson_mx_sdhc_probe(struct platform_device *pdev)
>> +{
>> + struct device *dev = &pdev->dev;
>> + struct meson_mx_sdhc_host *host;
>> + struct mmc_host *mmc;
>> + void __iomem *base;
>> + int ret, irq;
>> +
>> + mmc = mmc_alloc_host(sizeof(*host), dev);
>> + if (!mmc)
>> + return -ENOMEM;
>> +
>> + ret = devm_add_action_or_reset(dev, (void(*)(void *))mmc_free_host,
>> + mmc);
>> + if (ret) {
>> + dev_err(dev, "Failed to register mmc_free_host action\n");
>> + return ret;
>> + }
>> +
>> + host = mmc_priv(mmc);
>> + host->mmc = mmc;
>> +
>> + platform_set_drvdata(pdev, host);
>> +
>> + host->platform = device_get_match_data(dev);
>> + if (!host->platform)
>> + return -EINVAL;
>> +
>> + base = devm_platform_ioremap_resource(pdev, 0);
>> + if (IS_ERR(base))
>> + return PTR_ERR(base);
>> +
>> + host->regmap = devm_regmap_init_mmio(dev, base,
>> + &meson_mx_sdhc_regmap_config);
>> + if (IS_ERR(host->regmap))
>> + return PTR_ERR(host->regmap);
>> +
>> + host->pclk = devm_clk_get(dev, "pclk");
>> + if (IS_ERR(host->pclk))
>> + return PTR_ERR(host->pclk);
>> +
>> + /* accessing any register requires the module clock to be enabled: */
>> + ret = clk_prepare_enable(host->pclk);
>> + if (ret) {
>> + dev_err(dev, "Failed to enable 'pclk' clock\n");
>> + return ret;
>> + }
>> +
>> + meson_mx_sdhc_init_hw(mmc);
>> +
>> + ret = meson_mx_sdhc_register_clkc(dev, base, host->bulk_clks);
>> + if (ret)
>> + goto err_disable_pclk;
>> +
>> + host->sd_clk = host->bulk_clks[1].clk;
>> +
>> + /* Get regulators and the supported OCR mask */
>> + ret = mmc_regulator_get_supply(mmc);
>> + if (ret)
>> + goto err_disable_pclk;
>> +
>> + mmc->max_req_size = SZ_128K;
>> + mmc->max_seg_size = mmc->max_req_size;
>> + mmc->max_blk_count = FIELD_GET(MESON_SDHC_SEND_TOTAL_PACK, ~0);
>> + mmc->max_blk_size = MESON_SDHC_MAX_BLK_SIZE;
>> + mmc->max_busy_timeout = 30 * MSEC_PER_SEC;
>> + mmc->f_min = clk_round_rate(host->sd_clk, 1);
>> + mmc->f_max = clk_round_rate(host->sd_clk, ULONG_MAX);
>> + mmc->max_current_180 = 300;
>> + mmc->max_current_330 = 300;
>> + mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_HW_RESET;
>> + mmc->ops = &meson_mx_sdhc_ops;
>> +
>> + ret = mmc_of_parse(mmc);
>> + if (ret)
>> + goto err_disable_pclk;
>> +
>> + irq = platform_get_irq(pdev, 0);
>> + ret = devm_request_threaded_irq(dev, irq, meson_mx_sdhc_irq,
>> + meson_mx_sdhc_irq_thread, IRQF_ONESHOT,
>> + NULL, host);
>> + if (ret)
>> + goto err_disable_pclk;
>> +
>> + ret = mmc_add_host(mmc);
>> + if (ret)
>> + goto err_disable_pclk;
>> +
>> + return 0;
>> +
>> +err_disable_pclk:
>> + clk_disable_unprepare(host->pclk);
>> + return ret;
>> +}
>> +
>> +static int meson_mx_sdhc_remove(struct platform_device *pdev)
>> +{
>> + struct meson_mx_sdhc_host *host = platform_get_drvdata(pdev);
>> +
>> + mmc_remove_host(host->mmc);
>> +
>> + meson_mx_sdhc_disable_clks(host->mmc);
>> +
>> + clk_disable_unprepare(host->pclk);
>> +
>> + return 0;
>> +}
>> +
>> +static const struct meson_mx_sdhc_data meson_mx_sdhc_data_meson8 = {
>> + .init_hw = meson_mx_sdhc_init_hw_meson8,
>> + .set_pdma = meson_mx_sdhc_set_pdma_meson8,
>> + .wait_before_send = meson_mx_sdhc_wait_before_send_meson8,
>> + .hardware_flush_all_cmds = false,
>> +};
>> +
>> +static const struct meson_mx_sdhc_data meson_mx_sdhc_data_meson8m2 = {
>> + .init_hw = meson_mx_sdhc_init_hw_meson8m2,
>> + .set_pdma = meson_mx_sdhc_set_pdma_meson8m2,
>> + .hardware_flush_all_cmds = true,
>> +};
>> +
>> +static const struct of_device_id meson_mx_sdhc_of_match[] = {
>> + {
>> + .compatible = "amlogic,meson8-sdhc",
>> + .data = &meson_mx_sdhc_data_meson8
>> + },
>> + {
>> + .compatible = "amlogic,meson8b-sdhc",
>> + .data = &meson_mx_sdhc_data_meson8
>> + },
>> + {
>> + .compatible = "amlogic,meson8m2-sdhc",
>> + .data = &meson_mx_sdhc_data_meson8m2
>> + },
>> + { /* sentinel */ }
>> +};
>> +MODULE_DEVICE_TABLE(of, meson_mx_sdhc_of_match);
>> +
>> +static struct platform_driver meson_mx_sdhc_driver = {
>> + .probe = meson_mx_sdhc_probe,
>> + .remove = meson_mx_sdhc_remove,
>> + .driver = {
>> + .name = "meson-mx-sdhc",
>> + .of_match_table = of_match_ptr(meson_mx_sdhc_of_match),
>> + },
>> +};
>> +
>> +module_platform_driver(meson_mx_sdhc_driver);
>> +
>> +MODULE_DESCRIPTION("Meson6, Meson8, Meson8b and Meson8m2 SDHC Host Driver");
>> +MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>");
>> +MODULE_LICENSE("GPL v2");
>> diff --git a/drivers/mmc/host/meson-mx-sdhc.h b/drivers/mmc/host/meson-mx-sdhc.h
>> new file mode 100644
>> index 000000000000..230e8fbe6b3f
>> --- /dev/null
>> +++ b/drivers/mmc/host/meson-mx-sdhc.h
>> @@ -0,0 +1,141 @@
>> +/* SPDX-License-Identifier: GPL-2.0+ */
>> +/*
>> + * Copyright (C) 2020 Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
>> + */
>> +
>> +#ifndef _MESON_MX_SDHC_H_
>> +#define _MESON_MX_SDHC_H_
>> +
>> +#include <linux/bitfield.h>
>> +
>> +#define MESON_SDHC_ARGU 0x00
>> +
>> +#define MESON_SDHC_SEND 0x04
>> + #define MESON_SDHC_SEND_CMD_INDEX GENMASK(5, 0)
>> + #define MESON_SDHC_SEND_CMD_HAS_RESP BIT(6)
>> + #define MESON_SDHC_SEND_CMD_HAS_DATA BIT(7)
>> + #define MESON_SDHC_SEND_RESP_LEN BIT(8)
>> + #define MESON_SDHC_SEND_RESP_NO_CRC BIT(9)
>> + #define MESON_SDHC_SEND_DATA_DIR BIT(10)
>> + #define MESON_SDHC_SEND_DATA_STOP BIT(11)
>> + #define MESON_SDHC_SEND_R1B BIT(12)
>> + #define MESON_SDHC_SEND_TOTAL_PACK GENMASK(31, 16)
>> +
>> +#define MESON_SDHC_CTRL 0x08
>> + #define MESON_SDHC_CTRL_DAT_TYPE GENMASK(1, 0)
>> + #define MESON_SDHC_CTRL_DDR_MODE BIT(2)
>> + #define MESON_SDHC_CTRL_TX_CRC_NOCHECK BIT(3)
>> + #define MESON_SDHC_CTRL_PACK_LEN GENMASK(12, 4)
>> + #define MESON_SDHC_CTRL_RX_TIMEOUT GENMASK(19, 13)
>> + #define MESON_SDHC_CTRL_RX_PERIOD GENMASK(23, 20)
>> + #define MESON_SDHC_CTRL_RX_ENDIAN GENMASK(26, 24)
>> + #define MESON_SDHC_CTRL_SDIO_IRQ_MODE BIT(27)
>> + #define MESON_SDHC_CTRL_DAT0_IRQ_SEL BIT(28)
>> + #define MESON_SDHC_CTRL_TX_ENDIAN GENMASK(31, 29)
>> +
>> +#define MESON_SDHC_STAT 0x0c
>> + #define MESON_SDHC_STAT_CMD_BUSY BIT(0)
>> + #define MESON_SDHC_STAT_DAT3_0 GENMASK(4, 1)
>> + #define MESON_SDHC_STAT_CMD BIT(5)
>> + #define MESON_SDHC_STAT_RXFIFO_CNT GENMASK(12, 6)
>> + #define MESON_SDHC_STAT_TXFIFO_CNT GENMASK(19, 13)
>> + #define MESON_SDHC_STAT_DAT7_4 GENMASK(23, 20)
>> +
>> +#define MESON_SDHC_CLKC 0x10
>> + #define MESON_SDHC_CLKC_CLK_DIV GENMASK(11, 0)
>> + #define MESON_SDHC_CLKC_CLK_JIC BIT(24)
>> + #define MESON_SDHC_CLKC_MEM_PWR_OFF GENMASK(26, 25)
>> +
>> +#define MESON_SDHC_ADDR 0x14
>> +
>> +#define MESON_SDHC_PDMA 0x18
>> + #define MESON_SDHC_PDMA_DMA_MODE BIT(0)
>> + #define MESON_SDHC_PDMA_PIO_RDRESP GENMASK(3, 1)
>> + #define MESON_SDHC_PDMA_DMA_URGENT BIT(4)
>> + #define MESON_SDHC_PDMA_WR_BURST GENMASK(9, 5)
>> + #define MESON_SDHC_PDMA_RD_BURST GENMASK(14, 10)
>> + #define MESON_SDHC_PDMA_RXFIFO_TH GENMASK(21, 15)
>> + #define MESON_SDHC_PDMA_TXFIFO_TH GENMASK(28, 22)
>> + #define MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH GENMASK(30, 29)
>> + #define MESON_SDHC_PDMA_TXFIFO_FILL BIT(31)
>> +
>> +#define MESON_SDHC_MISC 0x1c
>> + #define MESON_SDHC_MISC_WCRC_ERR_PATT GENMASK(6, 4)
>> + #define MESON_SDHC_MISC_WCRC_OK_PATT GENMASK(9, 7)
>> + #define MESON_SDHC_MISC_BURST_NUM GENMASK(21, 16)
>> + #define MESON_SDHC_MISC_THREAD_ID GENMASK(27, 22)
>> + #define MESON_SDHC_MISC_MANUAL_STOP BIT(28)
>> + #define MESON_SDHC_MISC_TXSTART_THRES GENMASK(31, 29)
>> +
>> +#define MESON_SDHC_DATA 0x20
>> +
>> +#define MESON_SDHC_ICTL 0x24
>> + #define MESON_SDHC_ICTL_RESP_OK BIT(0)
>> + #define MESON_SDHC_ICTL_RESP_TIMEOUT BIT(1)
>> + #define MESON_SDHC_ICTL_RESP_ERR_CRC BIT(2)
>> + #define MESON_SDHC_ICTL_RESP_OK_NOCLEAR BIT(3)
>> + #define MESON_SDHC_ICTL_DATA_1PACK_OK BIT(4)
>> + #define MESON_SDHC_ICTL_DATA_TIMEOUT BIT(5)
>> + #define MESON_SDHC_ICTL_DATA_ERR_CRC BIT(6)
>> + #define MESON_SDHC_ICTL_DATA_XFER_OK BIT(7)
>> + #define MESON_SDHC_ICTL_RX_HIGHER BIT(8)
>> + #define MESON_SDHC_ICTL_RX_LOWER BIT(9)
>> + #define MESON_SDHC_ICTL_DAT1_IRQ BIT(10)
>> + #define MESON_SDHC_ICTL_DMA_DONE BIT(11)
>> + #define MESON_SDHC_ICTL_RXFIFO_FULL BIT(12)
>> + #define MESON_SDHC_ICTL_TXFIFO_EMPTY BIT(13)
>> + #define MESON_SDHC_ICTL_ADDI_DAT1_IRQ BIT(14)
>> + #define MESON_SDHC_ICTL_ALL_IRQS GENMASK(14, 0)
>> + #define MESON_SDHC_ICTL_DAT1_IRQ_DELAY GENMASK(17, 16)
>> +
>> +#define MESON_SDHC_ISTA 0x28
>> + #define MESON_SDHC_ISTA_RESP_OK BIT(0)
>> + #define MESON_SDHC_ISTA_RESP_TIMEOUT BIT(1)
>> + #define MESON_SDHC_ISTA_RESP_ERR_CRC BIT(2)
>> + #define MESON_SDHC_ISTA_RESP_OK_NOCLEAR BIT(3)
>> + #define MESON_SDHC_ISTA_DATA_1PACK_OK BIT(4)
>> + #define MESON_SDHC_ISTA_DATA_TIMEOUT BIT(5)
>> + #define MESON_SDHC_ISTA_DATA_ERR_CRC BIT(6)
>> + #define MESON_SDHC_ISTA_DATA_XFER_OK BIT(7)
>> + #define MESON_SDHC_ISTA_RX_HIGHER BIT(8)
>> + #define MESON_SDHC_ISTA_RX_LOWER BIT(9)
>> + #define MESON_SDHC_ISTA_DAT1_IRQ BIT(10)
>> + #define MESON_SDHC_ISTA_DMA_DONE BIT(11)
>> + #define MESON_SDHC_ISTA_RXFIFO_FULL BIT(12)
>> + #define MESON_SDHC_ISTA_TXFIFO_EMPTY BIT(13)
>> + #define MESON_SDHC_ISTA_ADDI_DAT1_IRQ BIT(14)
>> + #define MESON_SDHC_ISTA_ALL_IRQS GENMASK(14, 0)
>> +
>> +#define MESON_SDHC_SRST 0x2c
>> + #define MESON_SDHC_SRST_MAIN_CTRL BIT(0)
>> + #define MESON_SDHC_SRST_RXFIFO BIT(1)
>> + #define MESON_SDHC_SRST_TXFIFO BIT(2)
>> + #define MESON_SDHC_SRST_DPHY_RX BIT(3)
>> + #define MESON_SDHC_SRST_DPHY_TX BIT(4)
>> + #define MESON_SDHC_SRST_DMA_IF BIT(5)
>> +
>> +#define MESON_SDHC_ESTA 0x30
>> + #define MESON_SDHC_ESTA_11_13 GENMASK(13, 11)
>> +
>> +#define MESON_SDHC_ENHC 0x34
>> + #define MESON_SDHC_ENHC_MESON8M2_WRRSP_MODE BIT(0)
>> + #define MESON_SDHC_ENHC_MESON8M2_CHK_WRRSP BIT(1)
>> + #define MESON_SDHC_ENHC_MESON8M2_CHK_DMA BIT(2)
>> + #define MESON_SDHC_ENHC_MESON8M2_DEBUG GENMASK(5, 3)
>> + #define MESON_SDHC_ENHC_MESON6_RX_TIMEOUT GENMASK(7, 0)
>> + #define MESON_SDHC_ENHC_MESON6_DMA_RD_RESP BIT(16)
>> + #define MESON_SDHC_ENHC_MESON6_DMA_WR_RESP BIT(17)
>> + #define MESON_SDHC_ENHC_SDIO_IRQ_PERIOD GENMASK(15, 8)
>> + #define MESON_SDHC_ENHC_RXFIFO_TH GENMASK(24, 18)
>> + #define MESON_SDHC_ENHC_TXFIFO_TH GENMASK(31, 25)
>> +
>> +#define MESON_SDHC_CLK2 0x38
>> + #define MESON_SDHC_CLK2_RX_CLK_PHASE GENMASK(11, 0)
>> + #define MESON_SDHC_CLK2_SD_CLK_PHASE GENMASK(23, 12)
>> +
>> +struct clk_bulk_data;
>> +
>> +int meson_mx_sdhc_register_clkc(struct device *dev, void __iomem *base,
>> + struct clk_bulk_data *clk_bulk_data);
>> +
>> +#endif /* _MESON_MX_SDHC_H_ */
>> --
>> 2.26.2
>>
