// SPDX-License-Identifier: GPL-2.0+
/*
* Amlogic Meson6/Meson8/Meson8b/Meson8m2 SDHC MMC host controller driver.
*
* Copyright (C) 2020 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
*/
#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);
bool manual_stop = false;
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;
/*
* Mimic the logic from the vendor driver where (only)
* SD_IO_RW_EXTENDED commands with more than one block set the
* MESON_SDHC_MISC_MANUAL_STOP bit. This fixes the firmware
* download in the brcmfmac driver for a BCM43362/1 card.
* Without this sdio_memcpy_toio() (with a size of 219557
* bytes) times out if MESON_SDHC_MISC_MANUAL_STOP is not set.
*/
manual_stop = cmd->data->blocks > 1 &&
cmd->opcode == SD_IO_RW_EXTENDED;
} else {
pack_len = 0;
ictl |= MESON_SDHC_ICTL_RESP_OK;
}
regmap_update_bits(host->regmap, MESON_SDHC_MISC,
MESON_SDHC_MISC_MANUAL_STOP,
manual_stop ? MESON_SDHC_MISC_MANUAL_STOP : 0);
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 val, 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);
/*
* Phase 90 should work in most cases. For data transmission,
* meson_mx_sdhc_execute_tuning() will find a accurate value
*/
regmap_read(host->regmap, MESON_SDHC_CLKC, &val);
rx_clk_phase = FIELD_GET(MESON_SDHC_CLKC_CLK_DIV, val) / 4;
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;
unsigned 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) {
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 = {
.card_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);
/*
* If MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH was
* previously 0x1 then it has to be set to 0x3. If it
* was 0x0 before then it has to be set to 0x2. Without
* this reading SD cards sometimes transfers garbage,
* which results in cards not being detected due to:
* unrecognised SCR structure version <random number>
*/
val = FIELD_PREP(MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH,
2);
regmap_update_bits(host->regmap, MESON_SDHC_PDMA, val,
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 void meason_mx_mmc_free_host(void *data)
{
mmc_free_host(data);
}
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, meason_mx_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);
if (irq < 0) {
ret = irq;
goto err_disable_pclk;
}
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 void 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);
}
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_new = meson_mx_sdhc_remove,
.driver = {
.name = "meson-mx-sdhc",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.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@googlemail.com>");
MODULE_LICENSE("GPL v2");
