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linux/drivers/mmc/host/mvsdio.c
Linus Walleij 2761822c00 mmc: mvsdio: Use sg_miter for PIO 
Use the scatterlist memory iterator instead of just
dereferencing virtual memory using sg_virt().
This make highmem references work properly.

This driver also has a bug in the PIO sglist handling that
is fixed as part of the patch: it does not travers the
list of scatterbuffers: it will just process the first
item in the list. This is fixed by augmenting the logic
such that we do not process more than one sgitem
per IRQ instead of counting down potentially the whole
length of the request.

We can suspect that the PIO path is quite untested.

Suggested-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/linux-mmc/20240122073423.GA25859@lst.de/
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20240127-mmc-proper-kmap-v2-5-d8e732aa97d1@linaro.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2024-02-13 13:40:56 +01:00

877 lines
24 KiB
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Marvell MMC/SD/SDIO driver
*
* Authors: Maen Suleiman, Nicolas Pitre
* Copyright (C) 2008-2009 Marvell Ltd.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/mbus.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
#include <linux/scatterlist.h>
#include <linux/irq.h>
#include <linux/clk.h>
#include <linux/of_irq.h>
#include <linux/mmc/host.h>
#include <linux/mmc/slot-gpio.h>
#include <linux/sizes.h>
#include <asm/unaligned.h>
#include "mvsdio.h"
#define DRIVER_NAME "mvsdio"
static int maxfreq;
static int nodma;
struct mvsd_host {
void __iomem *base;
struct mmc_request *mrq;
spinlock_t lock;
unsigned int xfer_mode;
unsigned int intr_en;
unsigned int ctrl;
bool use_pio;
struct sg_mapping_iter sg_miter;
unsigned int pio_size;
unsigned int sg_frags;
unsigned int ns_per_clk;
unsigned int clock;
unsigned int base_clock;
struct timer_list timer;
struct mmc_host *mmc;
struct device *dev;
struct clk *clk;
};
#define mvsd_write(offs, val) writel(val, iobase + (offs))
#define mvsd_read(offs) readl(iobase + (offs))
static int mvsd_setup_data(struct mvsd_host *host, struct mmc_data *data)
{
void __iomem *iobase = host->base;
unsigned int tmout;
int tmout_index;
/*
* Hardware weirdness. The FIFO_EMPTY bit of the HW_STATE
* register is sometimes not set before a while when some
* "unusual" data block sizes are used (such as with the SWITCH
* command), even despite the fact that the XFER_DONE interrupt
* was raised. And if another data transfer starts before
* this bit comes to good sense (which eventually happens by
* itself) then the new transfer simply fails with a timeout.
*/
if (!(mvsd_read(MVSD_HW_STATE) & (1 << 13))) {
unsigned long t = jiffies + HZ;
unsigned int hw_state, count = 0;
do {
hw_state = mvsd_read(MVSD_HW_STATE);
if (time_after(jiffies, t)) {
dev_warn(host->dev, "FIFO_EMPTY bit missing\n");
break;
}
count++;
} while (!(hw_state & (1 << 13)));
dev_dbg(host->dev, "*** wait for FIFO_EMPTY bit "
"(hw=0x%04x, count=%d, jiffies=%ld)\n",
hw_state, count, jiffies - (t - HZ));
}
/* If timeout=0 then maximum timeout index is used. */
tmout = DIV_ROUND_UP(data->timeout_ns, host->ns_per_clk);
tmout += data->timeout_clks;
tmout_index = fls(tmout - 1) - 12;
if (tmout_index < 0)
tmout_index = 0;
if (tmout_index > MVSD_HOST_CTRL_TMOUT_MAX)
tmout_index = MVSD_HOST_CTRL_TMOUT_MAX;
dev_dbg(host->dev, "data %s at 0x%08x: blocks=%d blksz=%d tmout=%u (%d)\n",
(data->flags & MMC_DATA_READ) ? "read" : "write",
(u32)sg_virt(data->sg), data->blocks, data->blksz,
tmout, tmout_index);
host->ctrl &= ~MVSD_HOST_CTRL_TMOUT_MASK;
host->ctrl |= MVSD_HOST_CTRL_TMOUT(tmout_index);
mvsd_write(MVSD_HOST_CTRL, host->ctrl);
mvsd_write(MVSD_BLK_COUNT, data->blocks);
mvsd_write(MVSD_BLK_SIZE, data->blksz);
if (nodma || (data->blksz | data->sg->offset) & 3 ||
((!(data->flags & MMC_DATA_READ) && data->sg->offset & 0x3f))) {
/*
* We cannot do DMA on a buffer which offset or size
* is not aligned on a 4-byte boundary.
*
* It also appears the host to card DMA can corrupt
* data when the buffer is not aligned on a 64 byte
* boundary.
*/
unsigned int miter_flags = SG_MITER_ATOMIC; /* Used from IRQ */
if (data->flags & MMC_DATA_READ)
miter_flags |= SG_MITER_TO_SG;
else
miter_flags |= SG_MITER_FROM_SG;
host->pio_size = data->blocks * data->blksz;
sg_miter_start(&host->sg_miter, data->sg, data->sg_len, miter_flags);
if (!nodma)
dev_dbg(host->dev, "fallback to PIO for data\n");
host->use_pio = true;
return 1;
} else {
dma_addr_t phys_addr;
host->sg_frags = dma_map_sg(mmc_dev(host->mmc),
data->sg, data->sg_len,
mmc_get_dma_dir(data));
phys_addr = sg_dma_address(data->sg);
mvsd_write(MVSD_SYS_ADDR_LOW, (u32)phys_addr & 0xffff);
mvsd_write(MVSD_SYS_ADDR_HI, (u32)phys_addr >> 16);
host->use_pio = false;
return 0;
}
}
static void mvsd_request(struct mmc_host *mmc, struct mmc_request *mrq)
{
struct mvsd_host *host = mmc_priv(mmc);
void __iomem *iobase = host->base;
struct mmc_command *cmd = mrq->cmd;
u32 cmdreg = 0, xfer = 0, intr = 0;
unsigned long flags;
unsigned int timeout;
BUG_ON(host->mrq != NULL);
host->mrq = mrq;
dev_dbg(host->dev, "cmd %d (hw state 0x%04x)\n",
cmd->opcode, mvsd_read(MVSD_HW_STATE));
cmdreg = MVSD_CMD_INDEX(cmd->opcode);
if (cmd->flags & MMC_RSP_BUSY)
cmdreg |= MVSD_CMD_RSP_48BUSY;
else if (cmd->flags & MMC_RSP_136)
cmdreg |= MVSD_CMD_RSP_136;
else if (cmd->flags & MMC_RSP_PRESENT)
cmdreg |= MVSD_CMD_RSP_48;
else
cmdreg |= MVSD_CMD_RSP_NONE;
if (cmd->flags & MMC_RSP_CRC)
cmdreg |= MVSD_CMD_CHECK_CMDCRC;
if (cmd->flags & MMC_RSP_OPCODE)
cmdreg |= MVSD_CMD_INDX_CHECK;
if (cmd->flags & MMC_RSP_PRESENT) {
cmdreg |= MVSD_UNEXPECTED_RESP;
intr |= MVSD_NOR_UNEXP_RSP;
}
if (mrq->data) {
struct mmc_data *data = mrq->data;
int pio;
cmdreg |= MVSD_CMD_DATA_PRESENT | MVSD_CMD_CHECK_DATACRC16;
xfer |= MVSD_XFER_MODE_HW_WR_DATA_EN;
if (data->flags & MMC_DATA_READ)
xfer |= MVSD_XFER_MODE_TO_HOST;
pio = mvsd_setup_data(host, data);
if (pio) {
xfer |= MVSD_XFER_MODE_PIO;
/* PIO section of mvsd_irq has comments on those bits */
if (data->flags & MMC_DATA_WRITE)
intr |= MVSD_NOR_TX_AVAIL;
else if (host->pio_size > 32)
intr |= MVSD_NOR_RX_FIFO_8W;
else
intr |= MVSD_NOR_RX_READY;
}
if (data->stop) {
struct mmc_command *stop = data->stop;
u32 cmd12reg = 0;
mvsd_write(MVSD_AUTOCMD12_ARG_LOW, stop->arg & 0xffff);
mvsd_write(MVSD_AUTOCMD12_ARG_HI, stop->arg >> 16);
if (stop->flags & MMC_RSP_BUSY)
cmd12reg |= MVSD_AUTOCMD12_BUSY;
if (stop->flags & MMC_RSP_OPCODE)
cmd12reg |= MVSD_AUTOCMD12_INDX_CHECK;
cmd12reg |= MVSD_AUTOCMD12_INDEX(stop->opcode);
mvsd_write(MVSD_AUTOCMD12_CMD, cmd12reg);
xfer |= MVSD_XFER_MODE_AUTO_CMD12;
intr |= MVSD_NOR_AUTOCMD12_DONE;
} else {
intr |= MVSD_NOR_XFER_DONE;
}
} else {
intr |= MVSD_NOR_CMD_DONE;
}
mvsd_write(MVSD_ARG_LOW, cmd->arg & 0xffff);
mvsd_write(MVSD_ARG_HI, cmd->arg >> 16);
spin_lock_irqsave(&host->lock, flags);
host->xfer_mode &= MVSD_XFER_MODE_INT_CHK_EN;
host->xfer_mode |= xfer;
mvsd_write(MVSD_XFER_MODE, host->xfer_mode);
mvsd_write(MVSD_NOR_INTR_STATUS, ~MVSD_NOR_CARD_INT);
mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
mvsd_write(MVSD_CMD, cmdreg);
host->intr_en &= MVSD_NOR_CARD_INT;
host->intr_en |= intr | MVSD_NOR_ERROR;
mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
mvsd_write(MVSD_ERR_INTR_EN, 0xffff);
timeout = cmd->busy_timeout ? cmd->busy_timeout : 5000;
mod_timer(&host->timer, jiffies + msecs_to_jiffies(timeout));
spin_unlock_irqrestore(&host->lock, flags);
}
static u32 mvsd_finish_cmd(struct mvsd_host *host, struct mmc_command *cmd,
u32 err_status)
{
void __iomem *iobase = host->base;
if (cmd->flags & MMC_RSP_136) {
unsigned int response[8], i;
for (i = 0; i < 8; i++)
response[i] = mvsd_read(MVSD_RSP(i));
cmd->resp[0] = ((response[0] & 0x03ff) << 22) |
((response[1] & 0xffff) << 6) |
((response[2] & 0xfc00) >> 10);
cmd->resp[1] = ((response[2] & 0x03ff) << 22) |
((response[3] & 0xffff) << 6) |
((response[4] & 0xfc00) >> 10);
cmd->resp[2] = ((response[4] & 0x03ff) << 22) |
((response[5] & 0xffff) << 6) |
((response[6] & 0xfc00) >> 10);
cmd->resp[3] = ((response[6] & 0x03ff) << 22) |
((response[7] & 0x3fff) << 8);
} else if (cmd->flags & MMC_RSP_PRESENT) {
unsigned int response[3], i;
for (i = 0; i < 3; i++)
response[i] = mvsd_read(MVSD_RSP(i));
cmd->resp[0] = ((response[2] & 0x003f) << (8 - 8)) |
((response[1] & 0xffff) << (14 - 8)) |
((response[0] & 0x03ff) << (30 - 8));
cmd->resp[1] = ((response[0] & 0xfc00) >> 10);
cmd->resp[2] = 0;
cmd->resp[3] = 0;
}
if (err_status & MVSD_ERR_CMD_TIMEOUT) {
cmd->error = -ETIMEDOUT;
} else if (err_status & (MVSD_ERR_CMD_CRC | MVSD_ERR_CMD_ENDBIT |
MVSD_ERR_CMD_INDEX | MVSD_ERR_CMD_STARTBIT)) {
cmd->error = -EILSEQ;
}
err_status &= ~(MVSD_ERR_CMD_TIMEOUT | MVSD_ERR_CMD_CRC |
MVSD_ERR_CMD_ENDBIT | MVSD_ERR_CMD_INDEX |
MVSD_ERR_CMD_STARTBIT);
return err_status;
}
static u32 mvsd_finish_data(struct mvsd_host *host, struct mmc_data *data,
u32 err_status)
{
void __iomem *iobase = host->base;
if (host->use_pio) {
sg_miter_stop(&host->sg_miter);
host->pio_size = 0;
} else {
dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->sg_frags,
mmc_get_dma_dir(data));
}
if (err_status & MVSD_ERR_DATA_TIMEOUT)
data->error = -ETIMEDOUT;
else if (err_status & (MVSD_ERR_DATA_CRC | MVSD_ERR_DATA_ENDBIT))
data->error = -EILSEQ;
else if (err_status & MVSD_ERR_XFER_SIZE)
data->error = -EBADE;
err_status &= ~(MVSD_ERR_DATA_TIMEOUT | MVSD_ERR_DATA_CRC |
MVSD_ERR_DATA_ENDBIT | MVSD_ERR_XFER_SIZE);
dev_dbg(host->dev, "data done: blocks_left=%d, bytes_left=%d\n",
mvsd_read(MVSD_CURR_BLK_LEFT), mvsd_read(MVSD_CURR_BYTE_LEFT));
data->bytes_xfered =
(data->blocks - mvsd_read(MVSD_CURR_BLK_LEFT)) * data->blksz;
/* We can't be sure about the last block when errors are detected */
if (data->bytes_xfered && data->error)
data->bytes_xfered -= data->blksz;
/* Handle Auto cmd 12 response */
if (data->stop) {
unsigned int response[3], i;
for (i = 0; i < 3; i++)
response[i] = mvsd_read(MVSD_AUTO_RSP(i));
data->stop->resp[0] = ((response[2] & 0x003f) << (8 - 8)) |
((response[1] & 0xffff) << (14 - 8)) |
((response[0] & 0x03ff) << (30 - 8));
data->stop->resp[1] = ((response[0] & 0xfc00) >> 10);
data->stop->resp[2] = 0;
data->stop->resp[3] = 0;
if (err_status & MVSD_ERR_AUTOCMD12) {
u32 err_cmd12 = mvsd_read(MVSD_AUTOCMD12_ERR_STATUS);
dev_dbg(host->dev, "c12err 0x%04x\n", err_cmd12);
if (err_cmd12 & MVSD_AUTOCMD12_ERR_NOTEXE)
data->stop->error = -ENOEXEC;
else if (err_cmd12 & MVSD_AUTOCMD12_ERR_TIMEOUT)
data->stop->error = -ETIMEDOUT;
else if (err_cmd12)
data->stop->error = -EILSEQ;
err_status &= ~MVSD_ERR_AUTOCMD12;
}
}
return err_status;
}
static irqreturn_t mvsd_irq(int irq, void *dev)
{
struct mvsd_host *host = dev;
struct sg_mapping_iter *sgm = &host->sg_miter;
void __iomem *iobase = host->base;
u32 intr_status, intr_done_mask;
int irq_handled = 0;
u16 *p;
int s;
intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
dev_dbg(host->dev, "intr 0x%04x intr_en 0x%04x hw_state 0x%04x\n",
intr_status, mvsd_read(MVSD_NOR_INTR_EN),
mvsd_read(MVSD_HW_STATE));
/*
* It looks like, SDIO IP can issue one late, spurious irq
* although all irqs should be disabled. To work around this,
* bail out early, if we didn't expect any irqs to occur.
*/
if (!mvsd_read(MVSD_NOR_INTR_EN) && !mvsd_read(MVSD_ERR_INTR_EN)) {
dev_dbg(host->dev, "spurious irq detected intr 0x%04x intr_en 0x%04x erri 0x%04x erri_en 0x%04x\n",
mvsd_read(MVSD_NOR_INTR_STATUS),
mvsd_read(MVSD_NOR_INTR_EN),
mvsd_read(MVSD_ERR_INTR_STATUS),
mvsd_read(MVSD_ERR_INTR_EN));
return IRQ_HANDLED;
}
spin_lock(&host->lock);
/* PIO handling, if needed. Messy business... */
if (host->use_pio) {
/*
* As we set sgm->consumed this always gives a valid buffer
* position.
*/
if (!sg_miter_next(sgm)) {
/* This should not happen */
dev_err(host->dev, "ran out of scatter segments\n");
spin_unlock(&host->lock);
host->intr_en &=
~(MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W |
MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W);
mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
return IRQ_HANDLED;
}
p = sgm->addr;
s = sgm->length;
if (s > host->pio_size)
s = host->pio_size;
}
if (host->use_pio &&
(intr_status & host->intr_en &
(MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W))) {
while (s >= 32 && (intr_status & MVSD_NOR_RX_FIFO_8W)) {
readsw(iobase + MVSD_FIFO, p, 16);
p += 16;
s -= 32;
sgm->consumed += 32;
intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
}
/*
* Normally we'd use < 32 here, but the RX_FIFO_8W bit
* doesn't appear to assert when there is exactly 32 bytes
* (8 words) left to fetch in a transfer.
*/
if (s <= 32) {
while (s >= 4 && (intr_status & MVSD_NOR_RX_READY)) {
put_unaligned(mvsd_read(MVSD_FIFO), p++);
put_unaligned(mvsd_read(MVSD_FIFO), p++);
s -= 4;
sgm->consumed += 4;
intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
}
if (s && s < 4 && (intr_status & MVSD_NOR_RX_READY)) {
u16 val[2] = {0, 0};
val[0] = mvsd_read(MVSD_FIFO);
val[1] = mvsd_read(MVSD_FIFO);
memcpy(p, ((void *)&val) + 4 - s, s);
sgm->consumed += s;
s = 0;
intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
}
/* PIO transfer done */
host->pio_size -= sgm->consumed;
if (host->pio_size == 0) {
host->intr_en &=
~(MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W);
mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
} else if (host->intr_en & MVSD_NOR_RX_FIFO_8W) {
host->intr_en &= ~MVSD_NOR_RX_FIFO_8W;
host->intr_en |= MVSD_NOR_RX_READY;
mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
}
}
dev_dbg(host->dev, "pio %d intr 0x%04x hw_state 0x%04x\n",
s, intr_status, mvsd_read(MVSD_HW_STATE));
irq_handled = 1;
} else if (host->use_pio &&
(intr_status & host->intr_en &
(MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W))) {
/*
* The TX_FIFO_8W bit is unreliable. When set, bursting
* 16 halfwords all at once in the FIFO drops data. Actually
* TX_AVAIL does go off after only one word is pushed even if
* TX_FIFO_8W remains set.
*/
while (s >= 4 && (intr_status & MVSD_NOR_TX_AVAIL)) {
mvsd_write(MVSD_FIFO, get_unaligned(p++));
mvsd_write(MVSD_FIFO, get_unaligned(p++));
s -= 4;
sgm->consumed += 4;
intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
}
if (s < 4) {
if (s && (intr_status & MVSD_NOR_TX_AVAIL)) {
u16 val[2] = {0, 0};
memcpy(((void *)&val) + 4 - s, p, s);
mvsd_write(MVSD_FIFO, val[0]);
mvsd_write(MVSD_FIFO, val[1]);
sgm->consumed += s;
s = 0;
intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
}
/* PIO transfer done */
host->pio_size -= sgm->consumed;
if (host->pio_size == 0) {
host->intr_en &=
~(MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W);
mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
}
}
dev_dbg(host->dev, "pio %d intr 0x%04x hw_state 0x%04x\n",
s, intr_status, mvsd_read(MVSD_HW_STATE));
irq_handled = 1;
}
mvsd_write(MVSD_NOR_INTR_STATUS, intr_status);
intr_done_mask = MVSD_NOR_CARD_INT | MVSD_NOR_RX_READY |
MVSD_NOR_RX_FIFO_8W | MVSD_NOR_TX_FIFO_8W;
if (intr_status & host->intr_en & ~intr_done_mask) {
struct mmc_request *mrq = host->mrq;
struct mmc_command *cmd = mrq->cmd;
u32 err_status = 0;
del_timer(&host->timer);
host->mrq = NULL;
host->intr_en &= MVSD_NOR_CARD_INT;
mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
mvsd_write(MVSD_ERR_INTR_EN, 0);
spin_unlock(&host->lock);
if (intr_status & MVSD_NOR_UNEXP_RSP) {
cmd->error = -EPROTO;
} else if (intr_status & MVSD_NOR_ERROR) {
err_status = mvsd_read(MVSD_ERR_INTR_STATUS);
dev_dbg(host->dev, "err 0x%04x\n", err_status);
}
err_status = mvsd_finish_cmd(host, cmd, err_status);
if (mrq->data)
err_status = mvsd_finish_data(host, mrq->data, err_status);
if (err_status) {
dev_err(host->dev, "unhandled error status %#04x\n",
err_status);
cmd->error = -ENOMSG;
}
mmc_request_done(host->mmc, mrq);
irq_handled = 1;
} else
spin_unlock(&host->lock);
if (intr_status & MVSD_NOR_CARD_INT) {
mmc_signal_sdio_irq(host->mmc);
irq_handled = 1;
}
if (irq_handled)
return IRQ_HANDLED;
dev_err(host->dev, "unhandled interrupt status=0x%04x en=0x%04x pio=%d\n",
intr_status, host->intr_en, host->pio_size);
return IRQ_NONE;
}
static void mvsd_timeout_timer(struct timer_list *t)
{
struct mvsd_host *host = from_timer(host, t, timer);
void __iomem *iobase = host->base;
struct mmc_request *mrq;
unsigned long flags;
spin_lock_irqsave(&host->lock, flags);
mrq = host->mrq;
if (mrq) {
dev_err(host->dev, "Timeout waiting for hardware interrupt.\n");
dev_err(host->dev, "hw_state=0x%04x, intr_status=0x%04x intr_en=0x%04x\n",
mvsd_read(MVSD_HW_STATE),
mvsd_read(MVSD_NOR_INTR_STATUS),
mvsd_read(MVSD_NOR_INTR_EN));
host->mrq = NULL;
mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW);
host->xfer_mode &= MVSD_XFER_MODE_INT_CHK_EN;
mvsd_write(MVSD_XFER_MODE, host->xfer_mode);
host->intr_en &= MVSD_NOR_CARD_INT;
mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
mvsd_write(MVSD_ERR_INTR_EN, 0);
mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
mrq->cmd->error = -ETIMEDOUT;
mvsd_finish_cmd(host, mrq->cmd, 0);
if (mrq->data) {
mrq->data->error = -ETIMEDOUT;
mvsd_finish_data(host, mrq->data, 0);
}
}
spin_unlock_irqrestore(&host->lock, flags);
if (mrq)
mmc_request_done(host->mmc, mrq);
}
static void mvsd_enable_sdio_irq(struct mmc_host *mmc, int enable)
{
struct mvsd_host *host = mmc_priv(mmc);
void __iomem *iobase = host->base;
unsigned long flags;
spin_lock_irqsave(&host->lock, flags);
if (enable) {
host->xfer_mode |= MVSD_XFER_MODE_INT_CHK_EN;
host->intr_en |= MVSD_NOR_CARD_INT;
} else {
host->xfer_mode &= ~MVSD_XFER_MODE_INT_CHK_EN;
host->intr_en &= ~MVSD_NOR_CARD_INT;
}
mvsd_write(MVSD_XFER_MODE, host->xfer_mode);
mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
spin_unlock_irqrestore(&host->lock, flags);
}
static void mvsd_power_up(struct mvsd_host *host)
{
void __iomem *iobase = host->base;
dev_dbg(host->dev, "power up\n");
mvsd_write(MVSD_NOR_INTR_EN, 0);
mvsd_write(MVSD_ERR_INTR_EN, 0);
mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW);
mvsd_write(MVSD_XFER_MODE, 0);
mvsd_write(MVSD_NOR_STATUS_EN, 0xffff);
mvsd_write(MVSD_ERR_STATUS_EN, 0xffff);
mvsd_write(MVSD_NOR_INTR_STATUS, 0xffff);
mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
}
static void mvsd_power_down(struct mvsd_host *host)
{
void __iomem *iobase = host->base;
dev_dbg(host->dev, "power down\n");
mvsd_write(MVSD_NOR_INTR_EN, 0);
mvsd_write(MVSD_ERR_INTR_EN, 0);
mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW);
mvsd_write(MVSD_XFER_MODE, MVSD_XFER_MODE_STOP_CLK);
mvsd_write(MVSD_NOR_STATUS_EN, 0);
mvsd_write(MVSD_ERR_STATUS_EN, 0);
mvsd_write(MVSD_NOR_INTR_STATUS, 0xffff);
mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
}
static void mvsd_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct mvsd_host *host = mmc_priv(mmc);
void __iomem *iobase = host->base;
u32 ctrl_reg = 0;
if (ios->power_mode == MMC_POWER_UP)
mvsd_power_up(host);
if (ios->clock == 0) {
mvsd_write(MVSD_XFER_MODE, MVSD_XFER_MODE_STOP_CLK);
mvsd_write(MVSD_CLK_DIV, MVSD_BASE_DIV_MAX);
host->clock = 0;
dev_dbg(host->dev, "clock off\n");
} else if (ios->clock != host->clock) {
u32 m = DIV_ROUND_UP(host->base_clock, ios->clock) - 1;
if (m > MVSD_BASE_DIV_MAX)
m = MVSD_BASE_DIV_MAX;
mvsd_write(MVSD_CLK_DIV, m);
host->clock = ios->clock;
host->ns_per_clk = 1000000000 / (host->base_clock / (m+1));
dev_dbg(host->dev, "clock=%d (%d), div=0x%04x\n",
ios->clock, host->base_clock / (m+1), m);
}
/* default transfer mode */
ctrl_reg |= MVSD_HOST_CTRL_BIG_ENDIAN;
ctrl_reg &= ~MVSD_HOST_CTRL_LSB_FIRST;
/* default to maximum timeout */
ctrl_reg |= MVSD_HOST_CTRL_TMOUT_MASK;
ctrl_reg |= MVSD_HOST_CTRL_TMOUT_EN;
if (ios->bus_mode == MMC_BUSMODE_PUSHPULL)
ctrl_reg |= MVSD_HOST_CTRL_PUSH_PULL_EN;
if (ios->bus_width == MMC_BUS_WIDTH_4)
ctrl_reg |= MVSD_HOST_CTRL_DATA_WIDTH_4_BITS;
/*
* The HI_SPEED_EN bit is causing trouble with many (but not all)
* high speed SD, SDHC and SDIO cards. Not enabling that bit
* makes all cards work. So let's just ignore that bit for now
* and revisit this issue if problems for not enabling this bit
* are ever reported.
*/
#if 0
if (ios->timing == MMC_TIMING_MMC_HS ||
ios->timing == MMC_TIMING_SD_HS)
ctrl_reg |= MVSD_HOST_CTRL_HI_SPEED_EN;
#endif
host->ctrl = ctrl_reg;
mvsd_write(MVSD_HOST_CTRL, ctrl_reg);
dev_dbg(host->dev, "ctrl 0x%04x: %s %s %s\n", ctrl_reg,
(ctrl_reg & MVSD_HOST_CTRL_PUSH_PULL_EN) ?
"push-pull" : "open-drain",
(ctrl_reg & MVSD_HOST_CTRL_DATA_WIDTH_4_BITS) ?
"4bit-width" : "1bit-width",
(ctrl_reg & MVSD_HOST_CTRL_HI_SPEED_EN) ?
"high-speed" : "");
if (ios->power_mode == MMC_POWER_OFF)
mvsd_power_down(host);
}
static const struct mmc_host_ops mvsd_ops = {
.request = mvsd_request,
.get_ro = mmc_gpio_get_ro,
.set_ios = mvsd_set_ios,
.enable_sdio_irq = mvsd_enable_sdio_irq,
};
static void
mv_conf_mbus_windows(struct mvsd_host *host,
const struct mbus_dram_target_info *dram)
{
void __iomem *iobase = host->base;
int i;
for (i = 0; i < 4; i++) {
writel(0, iobase + MVSD_WINDOW_CTRL(i));
writel(0, iobase + MVSD_WINDOW_BASE(i));
}
for (i = 0; i < dram->num_cs; i++) {
const struct mbus_dram_window *cs = dram->cs + i;
writel(((cs->size - 1) & 0xffff0000) |
(cs->mbus_attr << 8) |
(dram->mbus_dram_target_id << 4) | 1,
iobase + MVSD_WINDOW_CTRL(i));
writel(cs->base, iobase + MVSD_WINDOW_BASE(i));
}
}
static int mvsd_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct mmc_host *mmc = NULL;
struct mvsd_host *host = NULL;
const struct mbus_dram_target_info *dram;
int ret, irq;
if (!np) {
dev_err(&pdev->dev, "no DT node\n");
return -ENODEV;
}
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
mmc = mmc_alloc_host(sizeof(struct mvsd_host), &pdev->dev);
if (!mmc) {
ret = -ENOMEM;
goto out;
}
host = mmc_priv(mmc);
host->mmc = mmc;
host->dev = &pdev->dev;
/*
* Some non-DT platforms do not pass a clock, and the clock
* frequency is passed through platform_data. On DT platforms,
* a clock must always be passed, even if there is no gatable
* clock associated to the SDIO interface (it can simply be a
* fixed rate clock).
*/
host->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(host->clk)) {
dev_err(&pdev->dev, "no clock associated\n");
ret = -EINVAL;
goto out;
}
clk_prepare_enable(host->clk);
mmc->ops = &mvsd_ops;
mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
mmc->f_min = DIV_ROUND_UP(host->base_clock, MVSD_BASE_DIV_MAX);
mmc->f_max = MVSD_CLOCKRATE_MAX;
mmc->max_blk_size = 2048;
mmc->max_blk_count = 65535;
mmc->max_segs = 1;
mmc->max_seg_size = mmc->max_blk_size * mmc->max_blk_count;
mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
host->base_clock = clk_get_rate(host->clk) / 2;
ret = mmc_of_parse(mmc);
if (ret < 0)
goto out;
if (maxfreq)
mmc->f_max = maxfreq;
spin_lock_init(&host->lock);
host->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(host->base)) {
ret = PTR_ERR(host->base);
goto out;
}
/* (Re-)program MBUS remapping windows if we are asked to. */
dram = mv_mbus_dram_info();
if (dram)
mv_conf_mbus_windows(host, dram);
mvsd_power_down(host);
ret = devm_request_irq(&pdev->dev, irq, mvsd_irq, 0, DRIVER_NAME, host);
if (ret) {
dev_err(&pdev->dev, "cannot assign irq %d\n", irq);
goto out;
}
timer_setup(&host->timer, mvsd_timeout_timer, 0);
platform_set_drvdata(pdev, mmc);
ret = mmc_add_host(mmc);
if (ret)
goto out;
if (!(mmc->caps & MMC_CAP_NEEDS_POLL))
dev_dbg(&pdev->dev, "using GPIO for card detection\n");
else
dev_dbg(&pdev->dev, "lacking card detect (fall back to polling)\n");
return 0;
out:
if (mmc) {
if (!IS_ERR(host->clk))
clk_disable_unprepare(host->clk);
mmc_free_host(mmc);
}
return ret;
}
static void mvsd_remove(struct platform_device *pdev)
{
struct mmc_host *mmc = platform_get_drvdata(pdev);
struct mvsd_host *host = mmc_priv(mmc);
mmc_remove_host(mmc);
del_timer_sync(&host->timer);
mvsd_power_down(host);
if (!IS_ERR(host->clk))
clk_disable_unprepare(host->clk);
mmc_free_host(mmc);
}
static const struct of_device_id mvsdio_dt_ids[] = {
{ .compatible = "marvell,orion-sdio" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mvsdio_dt_ids);
static struct platform_driver mvsd_driver = {
.probe = mvsd_probe,
.remove_new = mvsd_remove,
.driver = {
.name = DRIVER_NAME,
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = mvsdio_dt_ids,
},
};
module_platform_driver(mvsd_driver);
/* maximum card clock frequency (default 50MHz) */
module_param(maxfreq, int, 0);
/* force PIO transfers all the time */
module_param(nodma, int, 0);
MODULE_AUTHOR("Maen Suleiman, Nicolas Pitre");
MODULE_DESCRIPTION("Marvell MMC,SD,SDIO Host Controller driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:mvsdio");
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