dw_mmc.c
/*
* Synopsys DesignWare Multimedia Card Interface driver
* (Based on NXP driver for lpc 31xx)
*
* Copyright (C) 2009 NXP Semiconductors
* Copyright (C) 2009, 2010 Imagination Technologies Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/blkdev.h>
#include <linux/clk.h>
#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/scatterlist.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/stat.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/mmc/host.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/dw_mmc.h>
#include <linux/bitops.h>
#include <linux/regulator/consumer.h>
#include "dw_mmc.h"
/* Common flag combinations */
#define DW_MCI_DATA_ERROR_FLAGS (SDMMC_INT_DTO | SDMMC_INT_DCRC | \
SDMMC_INT_HTO | SDMMC_INT_SBE | \
SDMMC_INT_EBE)
#define DW_MCI_CMD_ERROR_FLAGS (SDMMC_INT_RTO | SDMMC_INT_RCRC | \
SDMMC_INT_RESP_ERR)
#define DW_MCI_ERROR_FLAGS (DW_MCI_DATA_ERROR_FLAGS | \
DW_MCI_CMD_ERROR_FLAGS | SDMMC_INT_HLE)
#define DW_MCI_SEND_STATUS 1
#define DW_MCI_RECV_STATUS 2
#define DW_MCI_DMA_THRESHOLD 16
#ifdef CONFIG_MMC_DW_IDMAC
struct idmac_desc {
u32 des0; /* Control Descriptor */
#define IDMAC_DES0_DIC BIT(1)
#define IDMAC_DES0_LD BIT(2)
#define IDMAC_DES0_FD BIT(3)
#define IDMAC_DES0_CH BIT(4)
#define IDMAC_DES0_ER BIT(5)
#define IDMAC_DES0_CES BIT(30)
#define IDMAC_DES0_OWN BIT(31)
u32 des1; /* Buffer sizes */
#define IDMAC_SET_BUFFER1_SIZE(d, s) \
((d)->des1 = ((d)->des1 & 0x03ffc000) | ((s) & 0x3fff))
u32 des2; /* buffer 1 physical address */
u32 des3; /* buffer 2 physical address */
};
#endif /* CONFIG_MMC_DW_IDMAC */
/**
* struct dw_mci_slot - MMC slot state
* @mmc: The mmc_host representing this slot.
* @host: The MMC controller this slot is using.
* @ctype: Card type for this slot.
* @mrq: mmc_request currently being processed or waiting to be
* processed, or NULL when the slot is idle.
* @queue_node: List node for placing this node in the @queue list of
* &struct dw_mci.
* @clock: Clock rate configured by set_ios(). Protected by host->lock.
* @flags: Random state bits associated with the slot.
* @id: Number of this slot.
* @last_detect_state: Most recently observed card detect state.
*/
struct dw_mci_slot {
struct mmc_host *mmc;
struct dw_mci *host;
u32 ctype;
struct mmc_request *mrq;
struct list_head queue_node;
unsigned int clock;
unsigned long flags;
#define DW_MMC_CARD_PRESENT 0
#define DW_MMC_CARD_NEED_INIT 1
int id;
int last_detect_state;
};
#if defined(CONFIG_DEBUG_FS)
static int dw_mci_req_show(struct seq_file *s, void *v)
{
struct dw_mci_slot *slot = s->private;
struct mmc_request *mrq;
struct mmc_command *cmd;
struct mmc_command *stop;
struct mmc_data *data;
/* Make sure we get a consistent snapshot */
spin_lock_bh(&slot->host->lock);
mrq = slot->mrq;
if (mrq) {
cmd = mrq->cmd;
data = mrq->data;
stop = mrq->stop;
if (cmd)
seq_printf(s,
"CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
cmd->opcode, cmd->arg, cmd->flags,
cmd->resp[0], cmd->resp[1], cmd->resp[2],
cmd->resp[2], cmd->error);
if (data)
seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
data->bytes_xfered, data->blocks,
data->blksz, data->flags, data->error);
if (stop)
seq_printf(s,
"CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
stop->opcode, stop->arg, stop->flags,
stop->resp[0], stop->resp[1], stop->resp[2],
stop->resp[2], stop->error);
}
spin_unlock_bh(&slot->host->lock);
return 0;
}
static int dw_mci_req_open(struct inode *inode, struct file *file)
{
return single_open(file, dw_mci_req_show, inode->i_private);
}
static const struct file_operations dw_mci_req_fops = {
.owner = THIS_MODULE,
.open = dw_mci_req_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int dw_mci_regs_show(struct seq_file *s, void *v)
{
seq_printf(s, "STATUS:\t0x%08x\n", SDMMC_STATUS);
seq_printf(s, "RINTSTS:\t0x%08x\n", SDMMC_RINTSTS);
seq_printf(s, "CMD:\t0x%08x\n", SDMMC_CMD);
seq_printf(s, "CTRL:\t0x%08x\n", SDMMC_CTRL);
seq_printf(s, "INTMASK:\t0x%08x\n", SDMMC_INTMASK);
seq_printf(s, "CLKENA:\t0x%08x\n", SDMMC_CLKENA);
return 0;
}
static int dw_mci_regs_open(struct inode *inode, struct file *file)
{
return single_open(file, dw_mci_regs_show, inode->i_private);
}
static const struct file_operations dw_mci_regs_fops = {
.owner = THIS_MODULE,
.open = dw_mci_regs_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static void dw_mci_init_debugfs(struct dw_mci_slot *slot)
{
struct mmc_host *mmc = slot->mmc;
struct dw_mci *host = slot->host;
struct dentry *root;
struct dentry *node;
root = mmc->debugfs_root;
if (!root)
return;
node = debugfs_create_file("regs", S_IRUSR, root, host,
&dw_mci_regs_fops);
if (!node)
goto err;
node = debugfs_create_file("req", S_IRUSR, root, slot,
&dw_mci_req_fops);
if (!node)
goto err;
node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
if (!node)
goto err;
node = debugfs_create_x32("pending_events", S_IRUSR, root,
(u32 *)&host->pending_events);
if (!node)
goto err;
node = debugfs_create_x32("completed_events", S_IRUSR, root,
(u32 *)&host->completed_events);
if (!node)
goto err;
return;
err:
dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
}
#endif /* defined(CONFIG_DEBUG_FS) */
static void dw_mci_set_timeout(struct dw_mci *host)
{
/* timeout (maximum) */
mci_writel(host, TMOUT, 0xffffffff);
}
static u32 dw_mci_prepare_command(struct mmc_host *mmc, struct mmc_command *cmd)
{
struct mmc_data *data;
u32 cmdr;
cmd->error = -EINPROGRESS;
cmdr = cmd->opcode;
if (cmdr == MMC_STOP_TRANSMISSION)
cmdr |= SDMMC_CMD_STOP;
else
cmdr |= SDMMC_CMD_PRV_DAT_WAIT;
if (cmd->flags & MMC_RSP_PRESENT) {
/* We expect a response, so set this bit */
cmdr |= SDMMC_CMD_RESP_EXP;
if (cmd->flags & MMC_RSP_136)
cmdr |= SDMMC_CMD_RESP_LONG;
}
if (cmd->flags & MMC_RSP_CRC)
cmdr |= SDMMC_CMD_RESP_CRC;
data = cmd->data;
if (data) {
cmdr |= SDMMC_CMD_DAT_EXP;
if (data->flags & MMC_DATA_STREAM)
cmdr |= SDMMC_CMD_STRM_MODE;
if (data->flags & MMC_DATA_WRITE)
cmdr |= SDMMC_CMD_DAT_WR;
}
return cmdr;
}
static void dw_mci_start_command(struct dw_mci *host,
struct mmc_command *cmd, u32 cmd_flags)
{
host->cmd = cmd;
dev_vdbg(&host->pdev->dev,
"start command: ARGR=0x%08x CMDR=0x%08x\n",
cmd->arg, cmd_flags);
mci_writel(host, CMDARG, cmd->arg);
wmb();
mci_writel(host, CMD, cmd_flags | SDMMC_CMD_START);
}
static void send_stop_cmd(struct dw_mci *host, struct mmc_data *data)
{
dw_mci_start_command(host, data->stop, host->stop_cmdr);
}
/* DMA interface functions */
static void dw_mci_stop_dma(struct dw_mci *host)
{
if (host->use_dma) {
host->dma_ops->stop(host);
host->dma_ops->cleanup(host);
} else {
/* Data transfer was stopped by the interrupt handler */
set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
}
}
#ifdef CONFIG_MMC_DW_IDMAC
static void dw_mci_dma_cleanup(struct dw_mci *host)
{
struct mmc_data *data = host->data;
if (data)
dma_unmap_sg(&host->pdev->dev, data->sg, data->sg_len,
((data->flags & MMC_DATA_WRITE)
? DMA_TO_DEVICE : DMA_FROM_DEVICE));
}
static void dw_mci_idmac_stop_dma(struct dw_mci *host)
{
u32 temp;
/* Disable and reset the IDMAC interface */
temp = mci_readl(host, CTRL);
temp &= ~SDMMC_CTRL_USE_IDMAC;
temp |= SDMMC_CTRL_DMA_RESET;
mci_writel(host, CTRL, temp);
/* Stop the IDMAC running */
temp = mci_readl(host, BMOD);
temp &= ~(SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB);
mci_writel(host, BMOD, temp);
}
static void dw_mci_idmac_complete_dma(struct dw_mci *host)
{
struct mmc_data *data = host->data;
dev_vdbg(&host->pdev->dev, "DMA complete\n");
host->dma_ops->cleanup(host);
/*
* If the card was removed, data will be NULL. No point in trying to
* send the stop command or waiting for NBUSY in this case.
*/
if (data) {
set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
tasklet_schedule(&host->tasklet);
}
}
static void dw_mci_translate_sglist(struct dw_mci *host, struct mmc_data *data,
unsigned int sg_len)
{
int i;
struct idmac_desc *desc = host->sg_cpu;
for (i = 0; i < sg_len; i++, desc++) {
unsigned int length = sg_dma_len(&data->sg[i]);
u32 mem_addr = sg_dma_address(&data->sg[i]);
/* Set the OWN bit and disable interrupts for this descriptor */
desc->des0 = IDMAC_DES0_OWN | IDMAC_DES0_DIC | IDMAC_DES0_CH;
/* Buffer length */
IDMAC_SET_BUFFER1_SIZE(desc, length);
/* Physical address to DMA to/from */
desc->des2 = mem_addr;
}
/* Set first descriptor */
desc = host->sg_cpu;
desc->des0 |= IDMAC_DES0_FD;
/* Set last descriptor */
desc = host->sg_cpu + (i - 1) * sizeof(struct idmac_desc);
desc->des0 &= ~(IDMAC_DES0_CH | IDMAC_DES0_DIC);
desc->des0 |= IDMAC_DES0_LD;
wmb();
}
static void dw_mci_idmac_start_dma(struct dw_mci *host, unsigned int sg_len)
{
u32 temp;
dw_mci_translate_sglist(host, host->data, sg_len);
/* Select IDMAC interface */
temp = mci_readl(host, CTRL);
temp |= SDMMC_CTRL_USE_IDMAC;
mci_writel(host, CTRL, temp);
wmb();
/* Enable the IDMAC */
temp = mci_readl(host, BMOD);
temp |= SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB;
mci_writel(host, BMOD, temp);
/* Start it running */
mci_writel(host, PLDMND, 1);
}
static int dw_mci_idmac_init(struct dw_mci *host)
{
struct idmac_desc *p;
int i;
/* Number of descriptors in the ring buffer */
host->ring_size = PAGE_SIZE / sizeof(struct idmac_desc);
/* Forward link the descriptor list */
for (i = 0, p = host->sg_cpu; i < host->ring_size - 1; i++, p++)
p->des3 = host->sg_dma + (sizeof(struct idmac_desc) * (i + 1));
/* Set the last descriptor as the end-of-ring descriptor */
p->des3 = host->sg_dma;
p->des0 = IDMAC_DES0_ER;
/* Mask out interrupts - get Tx & Rx complete only */
mci_writel(host, IDINTEN, SDMMC_IDMAC_INT_NI | SDMMC_IDMAC_INT_RI |
SDMMC_IDMAC_INT_TI);
/* Set the descriptor base address */
mci_writel(host, DBADDR, host->sg_dma);
return 0;
}
static struct dw_mci_dma_ops dw_mci_idmac_ops = {
.init = dw_mci_idmac_init,
.start = dw_mci_idmac_start_dma,
.stop = dw_mci_idmac_stop_dma,
.complete = dw_mci_idmac_complete_dma,
.cleanup = dw_mci_dma_cleanup,
};
#endif /* CONFIG_MMC_DW_IDMAC */
static int dw_mci_submit_data_dma(struct dw_mci *host, struct mmc_data *data)
{
struct scatterlist *sg;
unsigned int i, direction, sg_len;
u32 temp;
/* If we don't have a channel, we can't do DMA */
if (!host->use_dma)
return -ENODEV;
/*
* We don't do DMA on "complex" transfers, i.e. with
* non-word-aligned buffers or lengths. Also, we don't bother
* with all the DMA setup overhead for short transfers.
*/
if (data->blocks * data->blksz < DW_MCI_DMA_THRESHOLD)
return -EINVAL;
if (data->blksz & 3)
return -EINVAL;
for_each_sg(data->sg, sg, data->sg_len, i) {
if (sg->offset & 3 || sg->length & 3)
return -EINVAL;
}
if (data->flags & MMC_DATA_READ)
direction = DMA_FROM_DEVICE;
else
direction = DMA_TO_DEVICE;
sg_len = dma_map_sg(&host->pdev->dev, data->sg, data->sg_len,
direction);
dev_vdbg(&host->pdev->dev,
"sd sg_cpu: %#lx sg_dma: %#lx sg_len: %d\n",
(unsigned long)host->sg_cpu, (unsigned long)host->sg_dma,
sg_len);
/* Enable the DMA interface */
temp = mci_readl(host, CTRL);
temp |= SDMMC_CTRL_DMA_ENABLE;
mci_writel(host, CTRL, temp);
/* Disable RX/TX IRQs, let DMA handle it */
temp = mci_readl(host, INTMASK);
temp &= ~(SDMMC_INT_RXDR | SDMMC_INT_TXDR);
mci_writel(host, INTMASK, temp);
host->dma_ops->start(host, sg_len);
return 0;
}
static void dw_mci_submit_data(struct dw_mci *host, struct mmc_data *data)
{
u32 temp;
data->error = -EINPROGRESS;
WARN_ON(host->data);
host->sg = NULL;
host->data = data;
if (dw_mci_submit_data_dma(host, data)) {
host->sg = data->sg;
host->pio_offset = 0;
if (data->flags & MMC_DATA_READ)
host->dir_status = DW_MCI_RECV_STATUS;
else
host->dir_status = DW_MCI_SEND_STATUS;
temp = mci_readl(host, INTMASK);
temp |= SDMMC_INT_TXDR | SDMMC_INT_RXDR;
mci_writel(host, INTMASK, temp);
temp = mci_readl(host, CTRL);
temp &= ~SDMMC_CTRL_DMA_ENABLE;
mci_writel(host, CTRL, temp);
}
}
static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg)
{
struct dw_mci *host = slot->host;
unsigned long timeout = jiffies + msecs_to_jiffies(500);
unsigned int cmd_status = 0;
mci_writel(host, CMDARG, arg);
wmb();
mci_writel(host, CMD, SDMMC_CMD_START | cmd);
while (time_before(jiffies, timeout)) {
cmd_status = mci_readl(host, CMD);
if (!(cmd_status & SDMMC_CMD_START))
return;
}
dev_err(&slot->mmc->class_dev,
"Timeout sending command (cmd %#x arg %#x status %#x)\n",
cmd, arg, cmd_status);
}
static void dw_mci_setup_bus(struct dw_mci_slot *slot)
{
struct dw_mci *host = slot->host;
u32 div;
if (slot->clock != host->current_speed) {
if (host->bus_hz % slot->clock)
/*
* move the + 1 after the divide to prevent
* over-clocking the card.
*/
div = ((host->bus_hz / slot->clock) >> 1) + 1;
else
div = (host->bus_hz / slot->clock) >> 1;
dev_info(&slot->mmc->class_dev,
"Bus speed (slot %d) = %dHz (slot req %dHz, actual %dHZ"
" div = %d)\n", slot->id, host->bus_hz, slot->clock,
div ? ((host->bus_hz / div) >> 1) : host->bus_hz, div);
/* disable clock */
mci_writel(host, CLKENA, 0);
mci_writel(host, CLKSRC, 0);
/* inform CIU */
mci_send_cmd(slot,
SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
/* set clock to desired speed */
mci_writel(host, CLKDIV, div);
/* inform CIU */
mci_send_cmd(slot,
SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
/* enable clock */
mci_writel(host, CLKENA, SDMMC_CLKEN_ENABLE |
SDMMC_CLKEN_LOW_PWR);
/* inform CIU */
mci_send_cmd(slot,
SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
host->current_speed = slot->clock;
}
/* Set the current slot bus width */
mci_writel(host, CTYPE, slot->ctype);
}
static void dw_mci_start_request(struct dw_mci *host,
struct dw_mci_slot *slot)
{
struct mmc_request *mrq;
struct mmc_command *cmd;
struct mmc_data *data;
u32 cmdflags;
mrq = slot->mrq;
if (host->pdata->select_slot)
host->pdata->select_slot(slot->id);
/* Slot specific timing and width adjustment */
dw_mci_setup_bus(slot);
host->cur_slot = slot;
host->mrq = mrq;
host->pending_events = 0;
host->completed_events = 0;
host->data_status = 0;
data = mrq->data;
if (data) {
dw_mci_set_timeout(host);
mci_writel(host, BYTCNT, data->blksz*data->blocks);
mci_writel(host, BLKSIZ, data->blksz);
}
cmd = mrq->cmd;
cmdflags = dw_mci_prepare_command(slot->mmc, cmd);
/* this is the first command, send the initialization clock */
if (test_and_clear_bit(DW_MMC_CARD_NEED_INIT, &slot->flags))
cmdflags |= SDMMC_CMD_INIT;
if (data) {
dw_mci_submit_data(host, data);
wmb();
}
dw_mci_start_command(host, cmd, cmdflags);
if (mrq->stop)
host->stop_cmdr = dw_mci_prepare_command(slot->mmc, mrq->stop);
}
static void dw_mci_queue_request(struct dw_mci *host, struct dw_mci_slot *slot,
struct mmc_request *mrq)
{
dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
host->state);
spin_lock_bh(&host->lock);
slot->mrq = mrq;
if (host->state == STATE_IDLE) {
host->state = STATE_SENDING_CMD;
dw_mci_start_request(host, slot);
} else {
list_add_tail(&slot->queue_node, &host->queue);
}
spin_unlock_bh(&host->lock);
}
static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
{
struct dw_mci_slot *slot = mmc_priv(mmc);
struct dw_mci *host = slot->host;
WARN_ON(slot->mrq);
if (!test_bit(DW_MMC_CARD_PRESENT, &slot->flags)) {
mrq->cmd->error = -ENOMEDIUM;
mmc_request_done(mmc, mrq);
return;
}
/* We don't support multiple blocks of weird lengths. */
dw_mci_queue_request(host, slot, mrq);
}
static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct dw_mci_slot *slot = mmc_priv(mmc);
u32 regs;
/* set default 1 bit mode */
slot->ctype = SDMMC_CTYPE_1BIT;
switch (ios->bus_width) {
case MMC_BUS_WIDTH_1:
slot->ctype = SDMMC_CTYPE_1BIT;
break;
case MMC_BUS_WIDTH_4:
slot->ctype = SDMMC_CTYPE_4BIT;
break;
case MMC_BUS_WIDTH_8:
slot->ctype = SDMMC_CTYPE_8BIT;
break;
}
/* DDR mode set */
if (ios->ddr) {
regs = mci_readl(slot->host, UHS_REG);
regs |= (0x1 << slot->id) << 16;
mci_writel(slot->host, UHS_REG, regs);
}
if (ios->clock) {
/*
* Use mirror of ios->clock to prevent race with mmc
* core ios update when finding the minimum.
*/
slot->clock = ios->clock;
}
switch (ios->power_mode) {
case MMC_POWER_UP:
set_bit(DW_MMC_CARD_NEED_INIT, &slot->flags);
break;
default:
break;
}
}
static int dw_mci_get_ro(struct mmc_host *mmc)
{
int read_only;
struct dw_mci_slot *slot = mmc_priv(mmc);
struct dw_mci_board *brd = slot->host->pdata;
/* Use platform get_ro function, else try on board write protect */
if (brd->get_ro)
read_only = brd->get_ro(slot->id);
else
read_only =
mci_readl(slot->host, WRTPRT) & (1 << slot->id) ? 1 : 0;
dev_dbg(&mmc->class_dev, "card is %s\n",
read_only ? "read-only" : "read-write");
return read_only;
}
static int dw_mci_get_cd(struct mmc_host *mmc)
{
int present;
struct dw_mci_slot *slot = mmc_priv(mmc);
struct dw_mci_board *brd = slot->host->pdata;
/* Use platform get_cd function, else try onboard card detect */
if (brd->quirks & DW_MCI_QUIRK_BROKEN_CARD_DETECTION)
present = 1;
else if (brd->get_cd)
present = !brd->get_cd(slot->id);
else
present = (mci_readl(slot->host, CDETECT) & (1 << slot->id))
== 0 ? 1 : 0;
if (present)
dev_dbg(&mmc->class_dev, "card is present\n");
else
dev_dbg(&mmc->class_dev, "card is not present\n");
return present;
}
static const struct mmc_host_ops dw_mci_ops = {
.request = dw_mci_request,
.set_ios = dw_mci_set_ios,
.get_ro = dw_mci_get_ro,
.get_cd = dw_mci_get_cd,
};
static void dw_mci_request_end(struct dw_mci *host, struct mmc_request *mrq)
__releases(&host->lock)
__acquires(&host->lock)
{
struct dw_mci_slot *slot;
struct mmc_host *prev_mmc = host->cur_slot->mmc;
WARN_ON(host->cmd || host->data);
host->cur_slot->mrq = NULL;
host->mrq = NULL;
if (!list_empty(&host->queue)) {
slot = list_entry(host->queue.next,
struct dw_mci_slot, queue_node);
list_del(&slot->queue_node);
dev_vdbg(&host->pdev->dev, "list not empty: %s is next\n",
mmc_hostname(slot->mmc));
host->state = STATE_SENDING_CMD;
dw_mci_start_request(host, slot);
} else {
dev_vdbg(&host->pdev->dev, "list empty\n");
host->state = STATE_IDLE;
}
spin_unlock(&host->lock);
mmc_request_done(prev_mmc, mrq);
spin_lock(&host->lock);
}
static void dw_mci_command_complete(struct dw_mci *host, struct mmc_command *cmd)
{
u32 status = host->cmd_status;
host->cmd_status = 0;
/* Read the response from the card (up to 16 bytes) */
if (cmd->flags & MMC_RSP_PRESENT) {
if (cmd->flags & MMC_RSP_136) {
cmd->resp[3] = mci_readl(host, RESP0);
cmd->resp[2] = mci_readl(host, RESP1);
cmd->resp[1] = mci_readl(host, RESP2);
cmd->resp[0] = mci_readl(host, RESP3);
} else {
cmd->resp[0] = mci_readl(host, RESP0);
cmd->resp[1] = 0;
cmd->resp[2] = 0;
cmd->resp[3] = 0;
}
}
if (status & SDMMC_INT_RTO)
cmd->error = -ETIMEDOUT;
else if ((cmd->flags & MMC_RSP_CRC) && (status & SDMMC_INT_RCRC))
cmd->error = -EILSEQ;
else if (status & SDMMC_INT_RESP_ERR)
cmd->error = -EIO;
else
cmd->error = 0;
if (cmd->error) {
/* newer ip versions need a delay between retries */
if (host->quirks & DW_MCI_QUIRK_RETRY_DELAY)
mdelay(20);
if (cmd->data) {
host->data = NULL;
dw_mci_stop_dma(host);
}
}
}
static void dw_mci_tasklet_func(unsigned long priv)
{
struct dw_mci *host = (struct dw_mci *)priv;
struct mmc_data *data;
struct mmc_command *cmd;
enum dw_mci_state state;
enum dw_mci_state prev_state;
u32 status;
spin_lock(&host->lock);
state = host->state;
data = host->data;
do {
prev_state = state;
switch (state) {
case STATE_IDLE:
break;
case STATE_SENDING_CMD:
if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
&host->pending_events))
break;
cmd = host->cmd;
host->cmd = NULL;
set_bit(EVENT_CMD_COMPLETE, &host->completed_events);
dw_mci_command_complete(host, host->mrq->cmd);
if (!host->mrq->data || cmd->error) {
dw_mci_request_end(host, host->mrq);
goto unlock;
}
prev_state = state = STATE_SENDING_DATA;
/* fall through */
case STATE_SENDING_DATA:
if (test_and_clear_bit(EVENT_DATA_ERROR,
&host->pending_events)) {
dw_mci_stop_dma(host);
if (data->stop)
send_stop_cmd(host, data);
state = STATE_DATA_ERROR;
break;
}
if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
&host->pending_events))
break;
set_bit(EVENT_XFER_COMPLETE, &host->completed_events);
prev_state = state = STATE_DATA_BUSY;
/* fall through */
case STATE_DATA_BUSY:
if (!test_and_clear_bit(EVENT_DATA_COMPLETE,
&host->pending_events))
break;
host->data = NULL;
set_bit(EVENT_DATA_COMPLETE, &host->completed_events);
status = host->data_status;
if (status & DW_MCI_DATA_ERROR_FLAGS) {
if (status & SDMMC_INT_DTO) {
dev_err(&host->pdev->dev,
"data timeout error\n");
data->error = -ETIMEDOUT;
} else if (status & SDMMC_INT_DCRC) {
dev_err(&host->pdev->dev,
"data CRC error\n");
data->error = -EILSEQ;
} else {
dev_err(&host->pdev->dev,
"data FIFO error "
"(status=%08x)\n",
status);
data->error = -EIO;
}
} else {
data->bytes_xfered = data->blocks * data->blksz;
data->error = 0;
}
if (!data->stop) {
dw_mci_request_end(host, host->mrq);
goto unlock;
}
prev_state = state = STATE_SENDING_STOP;
if (!data->error)
send_stop_cmd(host, data);
/* fall through */
case STATE_SENDING_STOP:
if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
&host->pending_events))
break;
host->cmd = NULL;
dw_mci_command_complete(host, host->mrq->stop);
dw_mci_request_end(host, host->mrq);
goto unlock;
case STATE_DATA_ERROR:
if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
&host->pending_events))
break;
state = STATE_DATA_BUSY;
break;
}
} while (state != prev_state);
host->state = state;
unlock:
spin_unlock(&host->lock);
}
static void dw_mci_push_data16(struct dw_mci *host, void *buf, int cnt)
{
u16 *pdata = (u16 *)buf;
WARN_ON(cnt % 2 != 0);
cnt = cnt >> 1;
while (cnt > 0) {
mci_writew(host, DATA, *pdata++);
cnt--;
}
}
static void dw_mci_pull_data16(struct dw_mci *host, void *buf, int cnt)
{
u16 *pdata = (u16 *)buf;
WARN_ON(cnt % 2 != 0);
cnt = cnt >> 1;
while (cnt > 0) {
*pdata++ = mci_readw(host, DATA);
cnt--;
}
}
static void dw_mci_push_data32(struct dw_mci *host, void *buf, int cnt)
{
u32 *pdata = (u32 *)buf;
WARN_ON(cnt % 4 != 0);
WARN_ON((unsigned long)pdata & 0x3);
cnt = cnt >> 2;
while (cnt > 0) {
mci_writel(host, DATA, *pdata++);
cnt--;
}
}
static void dw_mci_pull_data32(struct dw_mci *host, void *buf, int cnt)
{
u32 *pdata = (u32 *)buf;
WARN_ON(cnt % 4 != 0);
WARN_ON((unsigned long)pdata & 0x3);
cnt = cnt >> 2;
while (cnt > 0) {
*pdata++ = mci_readl(host, DATA);
cnt--;
}
}
static void dw_mci_push_data64(struct dw_mci *host, void *buf, int cnt)
{
u64 *pdata = (u64 *)buf;
WARN_ON(cnt % 8 != 0);
cnt = cnt >> 3;
while (cnt > 0) {
mci_writeq(host, DATA, *pdata++);
cnt--;
}
}
static void dw_mci_pull_data64(struct dw_mci *host, void *buf, int cnt)
{
u64 *pdata = (u64 *)buf;
WARN_ON(cnt % 8 != 0);
cnt = cnt >> 3;
while (cnt > 0) {
*pdata++ = mci_readq(host, DATA);
cnt--;
}
}
static void dw_mci_read_data_pio(struct dw_mci *host)
{
struct scatterlist *sg = host->sg;
void *buf = sg_virt(sg);
unsigned int offset = host->pio_offset;
struct mmc_data *data = host->data;
int shift = host->data_shift;
u32 status;
unsigned int nbytes = 0, len;
do {
len = SDMMC_GET_FCNT(mci_readl(host, STATUS)) << shift;
if (offset + len <= sg->length) {
host->pull_data(host, (void *)(buf + offset), len);
offset += len;
nbytes += len;
if (offset == sg->length) {
flush_dcache_page(sg_page(sg));
host->sg = sg = sg_next(sg);
if (!sg)
goto done;
offset = 0;
buf = sg_virt(sg);
}
} else {
unsigned int remaining = sg->length - offset;
host->pull_data(host, (void *)(buf + offset),
remaining);
nbytes += remaining;
flush_dcache_page(sg_page(sg));
host->sg = sg = sg_next(sg);
if (!sg)
goto done;
offset = len - remaining;
buf = sg_virt(sg);
host->pull_data(host, buf, offset);
nbytes += offset;
}
status = mci_readl(host, MINTSTS);
mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
if (status & DW_MCI_DATA_ERROR_FLAGS) {
host->data_status = status;
data->bytes_xfered += nbytes;
smp_wmb();
set_bit(EVENT_DATA_ERROR, &host->pending_events);
tasklet_schedule(&host->tasklet);
return;
}
} while (status & SDMMC_INT_RXDR); /*if the RXDR is ready read again*/
len = SDMMC_GET_FCNT(mci_readl(host, STATUS));
host->pio_offset = offset;
data->bytes_xfered += nbytes;
return;
done:
data->bytes_xfered += nbytes;
smp_wmb();
set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
}
static void dw_mci_write_data_pio(struct dw_mci *host)
{
struct scatterlist *sg = host->sg;
void *buf = sg_virt(sg);
unsigned int offset = host->pio_offset;
struct mmc_data *data = host->data;
int shift = host->data_shift;
u32 status;
unsigned int nbytes = 0, len;
do {
len = SDMMC_FIFO_SZ -
(SDMMC_GET_FCNT(mci_readl(host, STATUS)) << shift);
if (offset + len <= sg->length) {
host->push_data(host, (void *)(buf + offset), len);
offset += len;
nbytes += len;
if (offset == sg->length) {
host->sg = sg = sg_next(sg);
if (!sg)
goto done;
offset = 0;
buf = sg_virt(sg);
}
} else {
unsigned int remaining = sg->length - offset;
host->push_data(host, (void *)(buf + offset),
remaining);
nbytes += remaining;
host->sg = sg = sg_next(sg);
if (!sg)
goto done;
offset = len - remaining;
buf = sg_virt(sg);
host->push_data(host, (void *)buf, offset);
nbytes += offset;
}
status = mci_readl(host, MINTSTS);
mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
if (status & DW_MCI_DATA_ERROR_FLAGS) {
host->data_status = status;
data->bytes_xfered += nbytes;
smp_wmb();
set_bit(EVENT_DATA_ERROR, &host->pending_events);
tasklet_schedule(&host->tasklet);
return;
}
} while (status & SDMMC_INT_TXDR); /* if TXDR write again */
host->pio_offset = offset;
data->bytes_xfered += nbytes;
return;
done:
data->bytes_xfered += nbytes;
smp_wmb();
set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
}
static void dw_mci_cmd_interrupt(struct dw_mci *host, u32 status)
{
if (!host->cmd_status)
host->cmd_status = status;
smp_wmb();
set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
tasklet_schedule(&host->tasklet);
}
static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
{
struct dw_mci *host = dev_id;
u32 status, pending;
unsigned int pass_count = 0;
do {
status = mci_readl(host, RINTSTS);
pending = mci_readl(host, MINTSTS); /* read-only mask reg */
/*
* DTO fix - version 2.10a and below, and only if internal DMA
* is configured.
*/
if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO) {
if (!pending &&
((mci_readl(host, STATUS) >> 17) & 0x1fff))
pending |= SDMMC_INT_DATA_OVER;
}
if (!pending)
break;
if (pending & DW_MCI_CMD_ERROR_FLAGS) {
mci_writel(host, RINTSTS, DW_MCI_CMD_ERROR_FLAGS);
host->cmd_status = status;
smp_wmb();
set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
tasklet_schedule(&host->tasklet);
}
if (pending & DW_MCI_DATA_ERROR_FLAGS) {
/* if there is an error report DATA_ERROR */
mci_writel(host, RINTSTS, DW_MCI_DATA_ERROR_FLAGS);
host->data_status = status;
smp_wmb();
set_bit(EVENT_DATA_ERROR, &host->pending_events);
tasklet_schedule(&host->tasklet);
}
if (pending & SDMMC_INT_DATA_OVER) {
mci_writel(host, RINTSTS, SDMMC_INT_DATA_OVER);
if (!host->data_status)
host->data_status = status;
smp_wmb();
if (host->dir_status == DW_MCI_RECV_STATUS) {
if (host->sg != NULL)
dw_mci_read_data_pio(host);
}
set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
tasklet_schedule(&host->tasklet);
}
if (pending & SDMMC_INT_RXDR) {
mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
if (host->sg)
dw_mci_read_data_pio(host);
}
if (pending & SDMMC_INT_TXDR) {
mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
if (host->sg)
dw_mci_write_data_pio(host);
}
if (pending & SDMMC_INT_CMD_DONE) {
mci_writel(host, RINTSTS, SDMMC_INT_CMD_DONE);
dw_mci_cmd_interrupt(host, status);
}
if (pending & SDMMC_INT_CD) {
mci_writel(host, RINTSTS, SDMMC_INT_CD);
tasklet_schedule(&host->card_tasklet);
}
} while (pass_count++ < 5);
#ifdef CONFIG_MMC_DW_IDMAC
/* Handle DMA interrupts */
pending = mci_readl(host, IDSTS);
if (pending & (SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI)) {
mci_writel(host, IDSTS, SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI);
mci_writel(host, IDSTS, SDMMC_IDMAC_INT_NI);
set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
host->dma_ops->complete(host);
}
#endif
return IRQ_HANDLED;
}
static void dw_mci_tasklet_card(unsigned long data)
{
struct dw_mci *host = (struct dw_mci *)data;
int i;
for (i = 0; i < host->num_slots; i++) {
struct dw_mci_slot *slot = host->slot[i];
struct mmc_host *mmc = slot->mmc;
struct mmc_request *mrq;
int present;
u32 ctrl;
present = dw_mci_get_cd(mmc);
while (present != slot->last_detect_state) {
spin_lock(&host->lock);
dev_dbg(&slot->mmc->class_dev, "card %s\n",
present ? "inserted" : "removed");
/* Card change detected */
slot->last_detect_state = present;
/* Power up slot */
if (present != 0) {
if (host->pdata->setpower)
host->pdata->setpower(slot->id,
mmc->ocr_avail);
set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
}
/* Clean up queue if present */
mrq = slot->mrq;
if (mrq) {
if (mrq == host->mrq) {
host->data = NULL;
host->cmd = NULL;
switch (host->state) {
case STATE_IDLE:
break;
case STATE_SENDING_CMD:
mrq->cmd->error = -ENOMEDIUM;
if (!mrq->data)
break;
/* fall through */
case STATE_SENDING_DATA:
mrq->data->error = -ENOMEDIUM;
dw_mci_stop_dma(host);
break;
case STATE_DATA_BUSY:
case STATE_DATA_ERROR:
if (mrq->data->error == -EINPROGRESS)
mrq->data->error = -ENOMEDIUM;
if (!mrq->stop)
break;
/* fall through */
case STATE_SENDING_STOP:
mrq->stop->error = -ENOMEDIUM;
break;
}
dw_mci_request_end(host, mrq);
} else {
list_del(&slot->queue_node);
mrq->cmd->error = -ENOMEDIUM;
if (mrq->data)
mrq->data->error = -ENOMEDIUM;
if (mrq->stop)
mrq->stop->error = -ENOMEDIUM;
spin_unlock(&host->lock);
mmc_request_done(slot->mmc, mrq);
spin_lock(&host->lock);
}
}
/* Power down slot */
if (present == 0) {
if (host->pdata->setpower)
host->pdata->setpower(slot->id, 0);
clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
/*
* Clear down the FIFO - doing so generates a
* block interrupt, hence setting the
* scatter-gather pointer to NULL.
*/
host->sg = NULL;
ctrl = mci_readl(host, CTRL);
ctrl |= SDMMC_CTRL_FIFO_RESET;
mci_writel(host, CTRL, ctrl);
#ifdef CONFIG_MMC_DW_IDMAC
ctrl = mci_readl(host, BMOD);
ctrl |= 0x01; /* Software reset of DMA */
mci_writel(host, BMOD, ctrl);
#endif
}
spin_unlock(&host->lock);
present = dw_mci_get_cd(mmc);
}
mmc_detect_change(slot->mmc,
msecs_to_jiffies(host->pdata->detect_delay_ms));
}
}
static int __init dw_mci_init_slot(struct dw_mci *host, unsigned int id)
{
struct mmc_host *mmc;
struct dw_mci_slot *slot;
mmc = mmc_alloc_host(sizeof(struct dw_mci_slot), &host->pdev->dev);
if (!mmc)
return -ENOMEM;
slot = mmc_priv(mmc);
slot->id = id;
slot->mmc = mmc;
slot->host = host;
mmc->ops = &dw_mci_ops;
mmc->f_min = DIV_ROUND_UP(host->bus_hz, 510);
mmc->f_max = host->bus_hz;
if (host->pdata->get_ocr)
mmc->ocr_avail = host->pdata->get_ocr(id);
else
mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
/*
* Start with slot power disabled, it will be enabled when a card
* is detected.
*/
if (host->pdata->setpower)
host->pdata->setpower(id, 0);
if (host->pdata->caps)
mmc->caps = host->pdata->caps;
else
mmc->caps = 0;
if (host->pdata->get_bus_wd)
if (host->pdata->get_bus_wd(slot->id) >= 4)
mmc->caps |= MMC_CAP_4_BIT_DATA;
if (host->pdata->quirks & DW_MCI_QUIRK_HIGHSPEED)
mmc->caps |= MMC_CAP_SD_HIGHSPEED;
#ifdef CONFIG_MMC_DW_IDMAC
mmc->max_segs = host->ring_size;
mmc->max_blk_size = 65536;
mmc->max_blk_count = host->ring_size;
mmc->max_seg_size = 0x1000;
mmc->max_req_size = mmc->max_seg_size * mmc->max_blk_count;
#else
if (host->pdata->blk_settings) {
mmc->max_segs = host->pdata->blk_settings->max_segs;
mmc->max_blk_size = host->pdata->blk_settings->max_blk_size;
mmc->max_blk_count = host->pdata->blk_settings->max_blk_count;
mmc->max_req_size = host->pdata->blk_settings->max_req_size;
mmc->max_seg_size = host->pdata->blk_settings->max_seg_size;
} else {
/* Useful defaults if platform data is unset. */
mmc->max_segs = 64;
mmc->max_blk_size = 65536; /* BLKSIZ is 16 bits */
mmc->max_blk_count = 512;
mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
mmc->max_seg_size = mmc->max_req_size;
}
#endif /* CONFIG_MMC_DW_IDMAC */
host->vmmc = regulator_get(mmc_dev(mmc), "vmmc");
if (IS_ERR(host->vmmc)) {
printk(KERN_INFO "%s: no vmmc regulator found\n", mmc_hostname(mmc));
host->vmmc = NULL;
} else
regulator_enable(host->vmmc);
if (dw_mci_get_cd(mmc))
set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
else
clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
host->slot[id] = slot;
mmc_add_host(mmc);
#if defined(CONFIG_DEBUG_FS)
dw_mci_init_debugfs(slot);
#endif
/* Card initially undetected */
slot->last_detect_state = 0;
/*
* Card may have been plugged in prior to boot so we
* need to run the detect tasklet
*/
tasklet_schedule(&host->card_tasklet);
return 0;
}
static void dw_mci_cleanup_slot(struct dw_mci_slot *slot, unsigned int id)
{
/* Shutdown detect IRQ */
if (slot->host->pdata->exit)
slot->host->pdata->exit(id);
/* Debugfs stuff is cleaned up by mmc core */
mmc_remove_host(slot->mmc);
slot->host->slot[id] = NULL;
mmc_free_host(slot->mmc);
}
static void dw_mci_init_dma(struct dw_mci *host)
{
/* Alloc memory for sg translation */
host->sg_cpu = dma_alloc_coherent(&host->pdev->dev, PAGE_SIZE,
&host->sg_dma, GFP_KERNEL);
if (!host->sg_cpu) {
dev_err(&host->pdev->dev, "%s: could not alloc DMA memory\n",
__func__);
goto no_dma;
}
/* Determine which DMA interface to use */
#ifdef CONFIG_MMC_DW_IDMAC
host->dma_ops = &dw_mci_idmac_ops;
dev_info(&host->pdev->dev, "Using internal DMA controller.\n");
#endif
if (!host->dma_ops)
goto no_dma;
if (host->dma_ops->init) {
if (host->dma_ops->init(host)) {
dev_err(&host->pdev->dev, "%s: Unable to initialize "
"DMA Controller.\n", __func__);
goto no_dma;
}
} else {
dev_err(&host->pdev->dev, "DMA initialization not found.\n");
goto no_dma;
}
host->use_dma = 1;
return;
no_dma:
dev_info(&host->pdev->dev, "Using PIO mode.\n");
host->use_dma = 0;
return;
}
static bool mci_wait_reset(struct device *dev, struct dw_mci *host)
{
unsigned long timeout = jiffies + msecs_to_jiffies(500);
unsigned int ctrl;
mci_writel(host, CTRL, (SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET |
SDMMC_CTRL_DMA_RESET));
/* wait till resets clear */
do {
ctrl = mci_readl(host, CTRL);
if (!(ctrl & (SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET |
SDMMC_CTRL_DMA_RESET)))
return true;
} while (time_before(jiffies, timeout));
dev_err(dev, "Timeout resetting block (ctrl %#x)\n", ctrl);
return false;
}
static int dw_mci_probe(struct platform_device *pdev)
{
struct dw_mci *host;
struct resource *regs;
struct dw_mci_board *pdata;
int irq, ret, i, width;
u32 fifo_size;
regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!regs)
return -ENXIO;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
host = kzalloc(sizeof(struct dw_mci), GFP_KERNEL);
if (!host)
return -ENOMEM;
host->pdev = pdev;
host->pdata = pdata = pdev->dev.platform_data;
if (!pdata || !pdata->init) {
dev_err(&pdev->dev,
"Platform data must supply init function\n");
ret = -ENODEV;
goto err_freehost;
}
if (!pdata->select_slot && pdata->num_slots > 1) {
dev_err(&pdev->dev,
"Platform data must supply select_slot function\n");
ret = -ENODEV;
goto err_freehost;
}
if (!pdata->bus_hz) {
dev_err(&pdev->dev,
"Platform data must supply bus speed\n");
ret = -ENODEV;
goto err_freehost;
}
host->bus_hz = pdata->bus_hz;
host->quirks = pdata->quirks;
spin_lock_init(&host->lock);
INIT_LIST_HEAD(&host->queue);
ret = -ENOMEM;
host->regs = ioremap(regs->start, regs->end - regs->start + 1);
if (!host->regs)
goto err_freehost;
host->dma_ops = pdata->dma_ops;
dw_mci_init_dma(host);
/*
* Get the host data width - this assumes that HCON has been set with
* the correct values.
*/
i = (mci_readl(host, HCON) >> 7) & 0x7;
if (!i) {
host->push_data = dw_mci_push_data16;
host->pull_data = dw_mci_pull_data16;
width = 16;
host->data_shift = 1;
} else if (i == 2) {
host->push_data = dw_mci_push_data64;
host->pull_data = dw_mci_pull_data64;
width = 64;
host->data_shift = 3;
} else {
/* Check for a reserved value, and warn if it is */
WARN((i != 1),
"HCON reports a reserved host data width!\n"
"Defaulting to 32-bit access.\n");
host->push_data = dw_mci_push_data32;
host->pull_data = dw_mci_pull_data32;
width = 32;
host->data_shift = 2;
}
/* Reset all blocks */
if (!mci_wait_reset(&pdev->dev, host)) {
ret = -ENODEV;
goto err_dmaunmap;
}
/* Clear the interrupts for the host controller */
mci_writel(host, RINTSTS, 0xFFFFFFFF);
mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
/* Put in max timeout */
mci_writel(host, TMOUT, 0xFFFFFFFF);
/*
* FIFO threshold settings RxMark = fifo_size / 2 - 1,
* Tx Mark = fifo_size / 2 DMA Size = 8
*/
fifo_size = mci_readl(host, FIFOTH);
fifo_size = (fifo_size >> 16) & 0x7ff;
host->fifoth_val = ((0x2 << 28) | ((fifo_size/2 - 1) << 16) |
((fifo_size/2) << 0));
mci_writel(host, FIFOTH, host->fifoth_val);
/* disable clock to CIU */
mci_writel(host, CLKENA, 0);
mci_writel(host, CLKSRC, 0);
tasklet_init(&host->tasklet, dw_mci_tasklet_func, (unsigned long)host);
tasklet_init(&host->card_tasklet,
dw_mci_tasklet_card, (unsigned long)host);
ret = request_irq(irq, dw_mci_interrupt, 0, "dw-mci", host);
if (ret)
goto err_dmaunmap;
platform_set_drvdata(pdev, host);
if (host->pdata->num_slots)
host->num_slots = host->pdata->num_slots;
else
host->num_slots = ((mci_readl(host, HCON) >> 1) & 0x1F) + 1;
/* We need at least one slot to succeed */
for (i = 0; i < host->num_slots; i++) {
ret = dw_mci_init_slot(host, i);
if (ret) {
ret = -ENODEV;
goto err_init_slot;
}
}
/*
* Enable interrupts for command done, data over, data empty, card det,
* receive ready and error such as transmit, receive timeout, crc error
*/
mci_writel(host, RINTSTS, 0xFFFFFFFF);
mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
SDMMC_INT_TXDR | SDMMC_INT_RXDR |
DW_MCI_ERROR_FLAGS | SDMMC_INT_CD);
mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE); /* Enable mci interrupt */
dev_info(&pdev->dev, "DW MMC controller at irq %d, "
"%d bit host data width\n", irq, width);
if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO)
dev_info(&pdev->dev, "Internal DMAC interrupt fix enabled.\n");
return 0;
err_init_slot:
/* De-init any initialized slots */
while (i > 0) {
if (host->slot[i])
dw_mci_cleanup_slot(host->slot[i], i);
i--;
}
free_irq(irq, host);
err_dmaunmap:
if (host->use_dma && host->dma_ops->exit)
host->dma_ops->exit(host);
dma_free_coherent(&host->pdev->dev, PAGE_SIZE,
host->sg_cpu, host->sg_dma);
iounmap(host->regs);
if (host->vmmc) {
regulator_disable(host->vmmc);
regulator_put(host->vmmc);
}
err_freehost:
kfree(host);
return ret;
}
static int __exit dw_mci_remove(struct platform_device *pdev)
{
struct dw_mci *host = platform_get_drvdata(pdev);
int i;
mci_writel(host, RINTSTS, 0xFFFFFFFF);
mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
platform_set_drvdata(pdev, NULL);
for (i = 0; i < host->num_slots; i++) {
dev_dbg(&pdev->dev, "remove slot %d\n", i);
if (host->slot[i])
dw_mci_cleanup_slot(host->slot[i], i);
}
/* disable clock to CIU */
mci_writel(host, CLKENA, 0);
mci_writel(host, CLKSRC, 0);
free_irq(platform_get_irq(pdev, 0), host);
dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
if (host->use_dma && host->dma_ops->exit)
host->dma_ops->exit(host);
if (host->vmmc) {
regulator_disable(host->vmmc);
regulator_put(host->vmmc);
}
iounmap(host->regs);
kfree(host);
return 0;
}
#ifdef CONFIG_PM
/*
* TODO: we should probably disable the clock to the card in the suspend path.
*/
static int dw_mci_suspend(struct platform_device *pdev, pm_message_t mesg)
{
int i, ret;
struct dw_mci *host = platform_get_drvdata(pdev);
for (i = 0; i < host->num_slots; i++) {
struct dw_mci_slot *slot = host->slot[i];
if (!slot)
continue;
ret = mmc_suspend_host(slot->mmc);
if (ret < 0) {
while (--i >= 0) {
slot = host->slot[i];
if (slot)
mmc_resume_host(host->slot[i]->mmc);
}
return ret;
}
}
if (host->vmmc)
regulator_disable(host->vmmc);
return 0;
}
static int dw_mci_resume(struct platform_device *pdev)
{
int i, ret;
struct dw_mci *host = platform_get_drvdata(pdev);
if (host->vmmc)
regulator_enable(host->vmmc);
if (host->dma_ops->init)
host->dma_ops->init(host);
if (!mci_wait_reset(&pdev->dev, host)) {
ret = -ENODEV;
return ret;
}
/* Restore the old value at FIFOTH register */
mci_writel(host, FIFOTH, host->fifoth_val);
mci_writel(host, RINTSTS, 0xFFFFFFFF);
mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
SDMMC_INT_TXDR | SDMMC_INT_RXDR |
DW_MCI_ERROR_FLAGS | SDMMC_INT_CD);
mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE);
for (i = 0; i < host->num_slots; i++) {
struct dw_mci_slot *slot = host->slot[i];
if (!slot)
continue;
ret = mmc_resume_host(host->slot[i]->mmc);
if (ret < 0)
return ret;
}
return 0;
}
#else
#define dw_mci_suspend NULL
#define dw_mci_resume NULL
#endif /* CONFIG_PM */
static struct platform_driver dw_mci_driver = {
.remove = __exit_p(dw_mci_remove),
.suspend = dw_mci_suspend,
.resume = dw_mci_resume,
.driver = {
.name = "dw_mmc",
},
};
static int __init dw_mci_init(void)
{
return platform_driver_probe(&dw_mci_driver, dw_mci_probe);
}
static void __exit dw_mci_exit(void)
{
platform_driver_unregister(&dw_mci_driver);
}
module_init(dw_mci_init);
module_exit(dw_mci_exit);
MODULE_DESCRIPTION("DW Multimedia Card Interface driver");
MODULE_AUTHOR("NXP Semiconductor VietNam");
MODULE_AUTHOR("Imagination Technologies Ltd");
MODULE_LICENSE("GPL v2");
