- 根目录:
- drivers
- mmc
- host
- mvsdio.c
/*
* Marvell MMC/SD/SDIO driver
*
* Authors: Maen Suleiman, Nicolas Pitre
* Copyright (C) 2008-2009 Marvell Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#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/gpio.h>
#include <linux/of_gpio.h>
#include <linux/of_irq.h>
#include <linux/mmc/host.h>
#include <linux/mmc/slot-gpio.h>
#include <linux/pinctrl/consumer.h>
#include <asm/sizes.h>
#include <asm/unaligned.h>
#include <linux/platform_data/mmc-mvsdio.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;
unsigned int pio_size;
void *pio_ptr;
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 {
if (time_after(jiffies, t)) {
dev_warn(host->dev, "FIFO_EMPTY bit missing\n");
break;
}
hw_state = mvsd_read(MVSD_HW_STATE);
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) {
/*
* We cannot do DMA on a buffer which offset or size
* is not aligned on a 4-byte boundary.
*/
host->pio_size = data->blocks * data->blksz;
host->pio_ptr = sg_virt(data->sg);
if (!nodma)
dev_dbg(host->dev, "fallback to PIO for data at 0x%p size %d\n",
host->pio_ptr, host->pio_size);
return 1;
} else {
dma_addr_t phys_addr;
int dma_dir = (data->flags & MMC_DATA_READ) ?
DMA_FROM_DEVICE : DMA_TO_DEVICE;
host->sg_frags = dma_map_sg(mmc_dev(host->mmc), data->sg,
data->sg_len, dma_dir);
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);
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;
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);
mod_timer(&host->timer, jiffies + 5 * HZ);
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->pio_ptr) {
host->pio_ptr = NULL;
host->pio_size = 0;
} else {
dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->sg_frags,
(data->flags & MMC_DATA_READ) ?
DMA_FROM_DEVICE : DMA_TO_DEVICE);
}
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;
void __iomem *iobase = host->base;
u32 intr_status, intr_done_mask;
int irq_handled = 0;
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));
spin_lock(&host->lock);
/* PIO handling, if needed. Messy business... */
if (host->pio_size &&
(intr_status & host->intr_en &
(MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W))) {
u16 *p = host->pio_ptr;
int s = host->pio_size;
while (s >= 32 && (intr_status & MVSD_NOR_RX_FIFO_8W)) {
readsw(iobase + MVSD_FIFO, p, 16);
p += 16;
s -= 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;
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);
s = 0;
intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
}
if (s == 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));
host->pio_ptr = p;
host->pio_size = s;
irq_handled = 1;
} else if (host->pio_size &&
(intr_status & host->intr_en &
(MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W))) {
u16 *p = host->pio_ptr;
int s = host->pio_size;
/*
* 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;
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]);
s = 0;
intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
}
if (s == 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));
host->pio_ptr = p;
host->pio_size = s;
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(unsigned long data)
{
struct mvsd_host *host = (struct mvsd_host *)data;
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;
struct resource *r;
int ret, irq;
struct pinctrl *pinctrl;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
irq = platform_get_irq(pdev, 0);
if (!r || irq < 0)
return -ENXIO;
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;
pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
if (IS_ERR(pinctrl))
dev_warn(&pdev->dev, "no pins associated\n");
/*
* 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))
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;
if (np) {
if (IS_ERR(host->clk)) {
dev_err(&pdev->dev, "DT platforms must have a clock associated\n");
ret = -EINVAL;
goto out;
}
host->base_clock = clk_get_rate(host->clk) / 2;
ret = mmc_of_parse(mmc);
if (ret < 0)
goto out;
} else {
const struct mvsdio_platform_data *mvsd_data;
mvsd_data = pdev->dev.platform_data;
if (!mvsd_data) {
ret = -ENXIO;
goto out;
}
mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ |
MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
host->base_clock = mvsd_data->clock / 2;
/* GPIO 0 regarded as invalid for backward compatibility */
if (mvsd_data->gpio_card_detect &&
gpio_is_valid(mvsd_data->gpio_card_detect)) {
ret = mmc_gpio_request_cd(mmc,
mvsd_data->gpio_card_detect,
0);
if (ret)
goto out;
} else {
mmc->caps |= MMC_CAP_NEEDS_POLL;
}
if (mvsd_data->gpio_write_protect &&
gpio_is_valid(mvsd_data->gpio_write_protect))
mmc_gpio_request_ro(mmc, mvsd_data->gpio_write_protect);
}
if (maxfreq)
mmc->f_max = maxfreq;
spin_lock_init(&host->lock);
host->base = devm_ioremap_resource(&pdev->dev, r);
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;
}
setup_timer(&host->timer, mvsd_timeout_timer, (unsigned long)host);
platform_set_drvdata(pdev, mmc);
ret = mmc_add_host(mmc);
if (ret)
goto out;
if (!(mmc->caps & MMC_CAP_NEEDS_POLL))
dev_notice(&pdev->dev, "using GPIO for card detection\n");
else
dev_notice(&pdev->dev,
"lacking card detect (fall back to polling)\n");
return 0;
out:
if (mmc) {
mmc_gpio_free_cd(mmc);
mmc_gpio_free_ro(mmc);
if (!IS_ERR(host->clk))
clk_disable_unprepare(host->clk);
mmc_free_host(mmc);
}
return ret;
}
static int mvsd_remove(struct platform_device *pdev)
{
struct mmc_host *mmc = platform_get_drvdata(pdev);
struct mvsd_host *host = mmc_priv(mmc);
mmc_gpio_free_cd(mmc);
mmc_gpio_free_ro(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);
return 0;
}
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 = mvsd_remove,
.driver = {
.name = DRIVER_NAME,
.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");