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linux/drivers/mmc/sdhci.c
Pierre Ossman d129bceb1d [PATCH] mmc: Secure Digital Host Controller Interface driver 
Driver for the Secure Digital Host Controller Interface specification.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-24 07:33:27 -08:00

1266 lines
31 KiB
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/*
* linux/drivers/mmc/sdhci.c - Secure Digital Host Controller Interface driver
*
* Copyright (C) 2005-2006 Pierre Ossman, All Rights Reserved.
*
* 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.
*/
/*
* Note that PIO transfer is rather crappy atm. The buffer full/empty
* interrupts aren't reliable so we currently transfer the entire buffer
* directly. Patches to solve the problem are welcome.
*/
#include <linux/delay.h>
#include <linux/highmem.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/mmc/host.h>
#include <linux/mmc/protocol.h>
#include <asm/scatterlist.h>
#include "sdhci.h"
#define DRIVER_NAME "sdhci"
#define DRIVER_VERSION "0.11"
#define BUGMAIL "<sdhci-devel@list.drzeus.cx>"
#ifdef CONFIG_MMC_DEBUG
#define DBG(f, x...) \
printk(KERN_DEBUG DRIVER_NAME " [%s()]: " f, __func__,## x)
#else
#define DBG(f, x...) do { } while (0)
#endif
static const struct pci_device_id pci_ids[] __devinitdata = {
/* handle any SD host controller */
{PCI_DEVICE_CLASS((PCI_CLASS_SYSTEM_SDHCI << 8), 0xFFFF00)},
{ /* end: all zeroes */ },
};
MODULE_DEVICE_TABLE(pci, pci_ids);
static void sdhci_prepare_data(struct sdhci_host *, struct mmc_data *);
static void sdhci_finish_data(struct sdhci_host *);
static void sdhci_send_command(struct sdhci_host *, struct mmc_command *);
static void sdhci_finish_command(struct sdhci_host *);
static void sdhci_dumpregs(struct sdhci_host *host)
{
printk(KERN_DEBUG DRIVER_NAME ": ============== REGISTER DUMP ==============\n");
printk(KERN_DEBUG DRIVER_NAME ": Sys addr: 0x%08x | Version: 0x%08x\n",
readl(host->ioaddr + SDHCI_DMA_ADDRESS),
readw(host->ioaddr + SDHCI_HOST_VERSION));
printk(KERN_DEBUG DRIVER_NAME ": Blk size: 0x%08x | Blk cnt: 0x%08x\n",
readw(host->ioaddr + SDHCI_BLOCK_SIZE),
readw(host->ioaddr + SDHCI_BLOCK_COUNT));
printk(KERN_DEBUG DRIVER_NAME ": Argument: 0x%08x | Trn mode: 0x%08x\n",
readl(host->ioaddr + SDHCI_ARGUMENT),
readw(host->ioaddr + SDHCI_TRANSFER_MODE));
printk(KERN_DEBUG DRIVER_NAME ": Present: 0x%08x | Host ctl: 0x%08x\n",
readl(host->ioaddr + SDHCI_PRESENT_STATE),
readb(host->ioaddr + SDHCI_HOST_CONTROL));
printk(KERN_DEBUG DRIVER_NAME ": Power: 0x%08x | Blk gap: 0x%08x\n",
readb(host->ioaddr + SDHCI_POWER_CONTROL),
readb(host->ioaddr + SDHCI_BLOCK_GAP_CONTROL));
printk(KERN_DEBUG DRIVER_NAME ": Wake-up: 0x%08x | Clock: 0x%08x\n",
readb(host->ioaddr + SDHCI_WALK_UP_CONTROL),
readw(host->ioaddr + SDHCI_CLOCK_CONTROL));
printk(KERN_DEBUG DRIVER_NAME ": Timeout: 0x%08x | Int stat: 0x%08x\n",
readb(host->ioaddr + SDHCI_TIMEOUT_CONTROL),
readl(host->ioaddr + SDHCI_INT_STATUS));
printk(KERN_DEBUG DRIVER_NAME ": Int enab: 0x%08x | Sig enab: 0x%08x\n",
readl(host->ioaddr + SDHCI_INT_ENABLE),
readl(host->ioaddr + SDHCI_SIGNAL_ENABLE));
printk(KERN_DEBUG DRIVER_NAME ": AC12 err: 0x%08x | Slot int: 0x%08x\n",
readw(host->ioaddr + SDHCI_ACMD12_ERR),
readw(host->ioaddr + SDHCI_SLOT_INT_STATUS));
printk(KERN_DEBUG DRIVER_NAME ": Caps: 0x%08x | Max curr: 0x%08x\n",
readl(host->ioaddr + SDHCI_CAPABILITIES),
readl(host->ioaddr + SDHCI_MAX_CURRENT));
printk(KERN_DEBUG DRIVER_NAME ": ===========================================\n");
}
/*****************************************************************************\
* *
* Low level functions *
* *
\*****************************************************************************/
static void sdhci_reset(struct sdhci_host *host, u8 mask)
{
writeb(mask, host->ioaddr + SDHCI_SOFTWARE_RESET);
if (mask & SDHCI_RESET_ALL) {
host->clock = 0;
mdelay(50);
}
}
static void sdhci_init(struct sdhci_host *host)
{
u32 intmask;
sdhci_reset(host, SDHCI_RESET_ALL);
intmask = ~(SDHCI_INT_CARD_INT | SDHCI_INT_BUF_EMPTY | SDHCI_INT_BUF_FULL);
writel(intmask, host->ioaddr + SDHCI_INT_ENABLE);
writel(intmask, host->ioaddr + SDHCI_SIGNAL_ENABLE);
/* This is unknown magic. */
writeb(0xE, host->ioaddr + SDHCI_TIMEOUT_CONTROL);
}
static void sdhci_activate_led(struct sdhci_host *host)
{
u8 ctrl;
ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
ctrl |= SDHCI_CTRL_LED;
writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
}
static void sdhci_deactivate_led(struct sdhci_host *host)
{
u8 ctrl;
ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
ctrl &= ~SDHCI_CTRL_LED;
writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
}
/*****************************************************************************\
* *
* Core functions *
* *
\*****************************************************************************/
static inline char* sdhci_kmap_sg(struct sdhci_host* host)
{
host->mapped_sg = kmap_atomic(host->cur_sg->page, KM_BIO_SRC_IRQ);
return host->mapped_sg + host->cur_sg->offset;
}
static inline void sdhci_kunmap_sg(struct sdhci_host* host)
{
kunmap_atomic(host->mapped_sg, KM_BIO_SRC_IRQ);
}
static inline int sdhci_next_sg(struct sdhci_host* host)
{
/*
* Skip to next SG entry.
*/
host->cur_sg++;
host->num_sg--;
/*
* Any entries left?
*/
if (host->num_sg > 0) {
host->offset = 0;
host->remain = host->cur_sg->length;
}
return host->num_sg;
}
static void sdhci_transfer_pio(struct sdhci_host *host)
{
char *buffer;
u32 mask;
int bytes, size;
unsigned long max_jiffies;
BUG_ON(!host->data);
if (host->num_sg == 0)
return;
bytes = 0;
if (host->data->flags & MMC_DATA_READ)
mask = SDHCI_DATA_AVAILABLE;
else
mask = SDHCI_SPACE_AVAILABLE;
buffer = sdhci_kmap_sg(host) + host->offset;
/* Transfer shouldn't take more than 5 s */
max_jiffies = jiffies + HZ * 5;
while (host->size > 0) {
if (time_after(jiffies, max_jiffies)) {
printk(KERN_ERR "%s: PIO transfer stalled. "
"Please report this to "
BUGMAIL ".\n", mmc_hostname(host->mmc));
sdhci_dumpregs(host);
sdhci_kunmap_sg(host);
host->data->error = MMC_ERR_FAILED;
sdhci_finish_data(host);
return;
}
if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & mask))
continue;
size = min(host->size, host->remain);
if (size >= 4) {
if (host->data->flags & MMC_DATA_READ)
*(u32*)buffer = readl(host->ioaddr + SDHCI_BUFFER);
else
writel(*(u32*)buffer, host->ioaddr + SDHCI_BUFFER);
size = 4;
} else if (size >= 2) {
if (host->data->flags & MMC_DATA_READ)
*(u16*)buffer = readw(host->ioaddr + SDHCI_BUFFER);
else
writew(*(u16*)buffer, host->ioaddr + SDHCI_BUFFER);
size = 2;
} else {
if (host->data->flags & MMC_DATA_READ)
*(u8*)buffer = readb(host->ioaddr + SDHCI_BUFFER);
else
writeb(*(u8*)buffer, host->ioaddr + SDHCI_BUFFER);
size = 1;
}
buffer += size;
host->offset += size;
host->remain -= size;
bytes += size;
host->size -= size;
if (host->remain == 0) {
sdhci_kunmap_sg(host);
if (sdhci_next_sg(host) == 0) {
DBG("PIO transfer: %d bytes\n", bytes);
return;
}
buffer = sdhci_kmap_sg(host);
}
}
sdhci_kunmap_sg(host);
DBG("PIO transfer: %d bytes\n", bytes);
}
static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data)
{
u16 mode;
WARN_ON(host->data);
if (data == NULL) {
writew(0, host->ioaddr + SDHCI_TRANSFER_MODE);
return;
}
DBG("blksz %04x blks %04x flags %08x\n",
1 << data->blksz_bits, data->blocks, data->flags);
DBG("tsac %d ms nsac %d clk\n",
data->timeout_ns / 1000000, data->timeout_clks);
mode = SDHCI_TRNS_BLK_CNT_EN;
if (data->blocks > 1)
mode |= SDHCI_TRNS_MULTI;
if (data->flags & MMC_DATA_READ)
mode |= SDHCI_TRNS_READ;
if (host->flags & SDHCI_USE_DMA)
mode |= SDHCI_TRNS_DMA;
writew(mode, host->ioaddr + SDHCI_TRANSFER_MODE);
writew(1 << data->blksz_bits, host->ioaddr + SDHCI_BLOCK_SIZE);
writew(data->blocks, host->ioaddr + SDHCI_BLOCK_COUNT);
if (host->flags & SDHCI_USE_DMA) {
int count;
count = pci_map_sg(host->chip->pdev, data->sg, data->sg_len,
(data->flags & MMC_DATA_READ)?PCI_DMA_FROMDEVICE:PCI_DMA_TODEVICE);
BUG_ON(count != 1);
writel(sg_dma_address(data->sg), host->ioaddr + SDHCI_DMA_ADDRESS);
} else {
host->size = (1 << data->blksz_bits) * data->blocks;
host->cur_sg = data->sg;
host->num_sg = data->sg_len;
host->offset = 0;
host->remain = host->cur_sg->length;
}
}
static void sdhci_finish_data(struct sdhci_host *host)
{
struct mmc_data *data;
u32 intmask;
u16 blocks;
BUG_ON(!host->data);
data = host->data;
host->data = NULL;
if (host->flags & SDHCI_USE_DMA) {
pci_unmap_sg(host->chip->pdev, data->sg, data->sg_len,
(data->flags & MMC_DATA_READ)?PCI_DMA_FROMDEVICE:PCI_DMA_TODEVICE);
} else {
intmask = readl(host->ioaddr + SDHCI_SIGNAL_ENABLE);
intmask &= ~(SDHCI_INT_BUF_EMPTY | SDHCI_INT_BUF_FULL);
writel(intmask, host->ioaddr + SDHCI_SIGNAL_ENABLE);
intmask = readl(host->ioaddr + SDHCI_INT_ENABLE);
intmask &= ~(SDHCI_INT_BUF_EMPTY | SDHCI_INT_BUF_FULL);
writel(intmask, host->ioaddr + SDHCI_INT_ENABLE);
}
/*
* Controller doesn't count down when in single block mode.
*/
if ((data->blocks == 1) && (data->error == MMC_ERR_NONE))
blocks = 0;
else
blocks = readw(host->ioaddr + SDHCI_BLOCK_COUNT);
data->bytes_xfered = (1 << data->blksz_bits) * (data->blocks - blocks);
if ((data->error == MMC_ERR_NONE) && blocks) {
printk(KERN_ERR "%s: Controller signalled completion even "
"though there were blocks left. Please report this "
"to " BUGMAIL ".\n", mmc_hostname(host->mmc));
data->error = MMC_ERR_FAILED;
}
if (host->size != 0) {
printk(KERN_ERR "%s: %d bytes were left untransferred. "
"Please report this to " BUGMAIL ".\n",
mmc_hostname(host->mmc), host->size);
data->error = MMC_ERR_FAILED;
}
DBG("Ending data transfer (%d bytes)\n", data->bytes_xfered);
if (data->stop) {
/*
* The controller needs a reset of internal state machines
* upon error conditions.
*/
if (data->error != MMC_ERR_NONE) {
sdhci_reset(host, SDHCI_RESET_CMD);
sdhci_reset(host, SDHCI_RESET_DATA);
}
sdhci_send_command(host, data->stop);
} else
tasklet_schedule(&host->finish_tasklet);
}
static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
{
int flags;
u32 present;
unsigned long max_jiffies;
WARN_ON(host->cmd);
DBG("Sending cmd (%x)\n", cmd->opcode);
/* Wait max 10 ms */
max_jiffies = jiffies + (HZ + 99)/100;
do {
if (time_after(jiffies, max_jiffies)) {
printk(KERN_ERR "%s: Controller never released "
"inhibit bits. Please report this to "
BUGMAIL ".\n", mmc_hostname(host->mmc));
sdhci_dumpregs(host);
cmd->error = MMC_ERR_FAILED;
tasklet_schedule(&host->finish_tasklet);
return;
}
present = readl(host->ioaddr + SDHCI_PRESENT_STATE);
} while (present & (SDHCI_CMD_INHIBIT | SDHCI_DATA_INHIBIT));
mod_timer(&host->timer, jiffies + 10 * HZ);
host->cmd = cmd;
sdhci_prepare_data(host, cmd->data);
writel(cmd->arg, host->ioaddr + SDHCI_ARGUMENT);
if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
printk(KERN_ERR "%s: Unsupported response type! "
"Please report this to " BUGMAIL ".\n",
mmc_hostname(host->mmc));
cmd->error = MMC_ERR_INVALID;
tasklet_schedule(&host->finish_tasklet);
return;
}
if (!(cmd->flags & MMC_RSP_PRESENT))
flags = SDHCI_CMD_RESP_NONE;
else if (cmd->flags & MMC_RSP_136)
flags = SDHCI_CMD_RESP_LONG;
else if (cmd->flags & MMC_RSP_BUSY)
flags = SDHCI_CMD_RESP_SHORT_BUSY;
else
flags = SDHCI_CMD_RESP_SHORT;
if (cmd->flags & MMC_RSP_CRC)
flags |= SDHCI_CMD_CRC;
if (cmd->flags & MMC_RSP_OPCODE)
flags |= SDHCI_CMD_INDEX;
if (cmd->data)
flags |= SDHCI_CMD_DATA;
writel(SDHCI_MAKE_CMD(cmd->opcode, flags),
host->ioaddr + SDHCI_COMMAND);
}
static void sdhci_finish_command(struct sdhci_host *host)
{
int i;
BUG_ON(host->cmd == NULL);
if (host->cmd->flags & MMC_RSP_PRESENT) {
if (host->cmd->flags & MMC_RSP_136) {
/* CRC is stripped so we need to do some shifting. */
for (i = 0;i < 4;i++) {
host->cmd->resp[i] = readl(host->ioaddr +
SDHCI_RESPONSE + (3-i)*4) << 8;
if (i != 3)
host->cmd->resp[i] |=
readb(host->ioaddr +
SDHCI_RESPONSE + (3-i)*4-1);
}
} else {
host->cmd->resp[0] = readl(host->ioaddr + SDHCI_RESPONSE);
}
}
host->cmd->error = MMC_ERR_NONE;
DBG("Ending cmd (%x)\n", host->cmd->opcode);
if (host->cmd->data) {
u32 intmask;
host->data = host->cmd->data;
if (!(host->flags & SDHCI_USE_DMA)) {
/*
* Don't enable the interrupts until now to make sure we
* get stable handling of the FIFO.
*/
intmask = readl(host->ioaddr + SDHCI_INT_ENABLE);
intmask |= SDHCI_INT_BUF_EMPTY | SDHCI_INT_BUF_FULL;
writel(intmask, host->ioaddr + SDHCI_INT_ENABLE);
intmask = readl(host->ioaddr + SDHCI_SIGNAL_ENABLE);
intmask |= SDHCI_INT_BUF_EMPTY | SDHCI_INT_BUF_FULL;
writel(intmask, host->ioaddr + SDHCI_SIGNAL_ENABLE);
/*
* The buffer interrupts are to unreliable so we
* start the transfer immediatly.
*/
sdhci_transfer_pio(host);
}
} else
tasklet_schedule(&host->finish_tasklet);
host->cmd = NULL;
}
static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
{
int div;
u16 clk;
unsigned long max_jiffies;
if (clock == host->clock)
return;
writew(0, host->ioaddr + SDHCI_CLOCK_CONTROL);
if (clock == 0)
goto out;
for (div = 1;div < 256;div *= 2) {
if ((host->max_clk / div) <= clock)
break;
}
div >>= 1;
clk = div << SDHCI_DIVIDER_SHIFT;
clk |= SDHCI_CLOCK_INT_EN;
writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
/* Wait max 10 ms */
max_jiffies = jiffies + (HZ + 99)/100;
do {
if (time_after(jiffies, max_jiffies)) {
printk(KERN_ERR "%s: Internal clock never stabilised. "
"Please report this to " BUGMAIL ".\n",
mmc_hostname(host->mmc));
sdhci_dumpregs(host);
return;
}
clk = readw(host->ioaddr + SDHCI_CLOCK_CONTROL);
} while (!(clk & SDHCI_CLOCK_INT_STABLE));
clk |= SDHCI_CLOCK_CARD_EN;
writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
out:
host->clock = clock;
}
/*****************************************************************************\
* *
* MMC callbacks *
* *
\*****************************************************************************/
static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
{
struct sdhci_host *host;
unsigned long flags;
host = mmc_priv(mmc);
spin_lock_irqsave(&host->lock, flags);
WARN_ON(host->mrq != NULL);
sdhci_activate_led(host);
host->mrq = mrq;
if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
host->mrq->cmd->error = MMC_ERR_TIMEOUT;
tasklet_schedule(&host->finish_tasklet);
} else
sdhci_send_command(host, mrq->cmd);
spin_unlock_irqrestore(&host->lock, flags);
}
static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct sdhci_host *host;
unsigned long flags;
u8 ctrl;
host = mmc_priv(mmc);
spin_lock_irqsave(&host->lock, flags);
DBG("clock %uHz busmode %u powermode %u cs %u Vdd %u width %u\n",
ios->clock, ios->bus_mode, ios->power_mode, ios->chip_select,
ios->vdd, ios->bus_width);
/*
* Reset the chip on each power off.
* Should clear out any weird states.
*/
if (ios->power_mode == MMC_POWER_OFF) {
writel(0, host->ioaddr + SDHCI_SIGNAL_ENABLE);
spin_unlock_irqrestore(&host->lock, flags);
sdhci_init(host);
spin_lock_irqsave(&host->lock, flags);
}
sdhci_set_clock(host, ios->clock);
if (ios->power_mode == MMC_POWER_OFF)
writeb(0, host->ioaddr + SDHCI_POWER_CONTROL);
else
writeb(0xFF, host->ioaddr + SDHCI_POWER_CONTROL);
ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
if (ios->bus_width == MMC_BUS_WIDTH_4)
ctrl |= SDHCI_CTRL_4BITBUS;
else
ctrl &= ~SDHCI_CTRL_4BITBUS;
writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
spin_unlock_irqrestore(&host->lock, flags);
}
static int sdhci_get_ro(struct mmc_host *mmc)
{
struct sdhci_host *host;
unsigned long flags;
int present;
host = mmc_priv(mmc);
spin_lock_irqsave(&host->lock, flags);
present = readl(host->ioaddr + SDHCI_PRESENT_STATE);
spin_unlock_irqrestore(&host->lock, flags);
return !(present & SDHCI_WRITE_PROTECT);
}
static struct mmc_host_ops sdhci_ops = {
.request = sdhci_request,
.set_ios = sdhci_set_ios,
.get_ro = sdhci_get_ro,
};
/*****************************************************************************\
* *
* Tasklets *
* *
\*****************************************************************************/
static void sdhci_tasklet_card(unsigned long param)
{
struct sdhci_host *host;
unsigned long flags;
host = (struct sdhci_host*)param;
spin_lock_irqsave(&host->lock, flags);
if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
if (host->mrq) {
printk(KERN_ERR "%s: Card removed during transfer!\n",
mmc_hostname(host->mmc));
printk(KERN_ERR "%s: Resetting controller.\n",
mmc_hostname(host->mmc));
sdhci_reset(host, SDHCI_RESET_CMD);
sdhci_reset(host, SDHCI_RESET_DATA);
host->mrq->cmd->error = MMC_ERR_FAILED;
tasklet_schedule(&host->finish_tasklet);
}
}
spin_unlock_irqrestore(&host->lock, flags);
mmc_detect_change(host->mmc, msecs_to_jiffies(500));
}
static void sdhci_tasklet_finish(unsigned long param)
{
struct sdhci_host *host;
unsigned long flags;
struct mmc_request *mrq;
host = (struct sdhci_host*)param;
spin_lock_irqsave(&host->lock, flags);
del_timer(&host->timer);
mrq = host->mrq;
DBG("Ending request, cmd (%x)\n", mrq->cmd->opcode);
/*
* The controller needs a reset of internal state machines
* upon error conditions.
*/
if ((mrq->cmd->error != MMC_ERR_NONE) ||
(mrq->data && ((mrq->data->error != MMC_ERR_NONE) ||
(mrq->data->stop && (mrq->data->stop->error != MMC_ERR_NONE))))) {
sdhci_reset(host, SDHCI_RESET_CMD);
sdhci_reset(host, SDHCI_RESET_DATA);
}
host->mrq = NULL;
host->cmd = NULL;
host->data = NULL;
sdhci_deactivate_led(host);
spin_unlock_irqrestore(&host->lock, flags);
mmc_request_done(host->mmc, mrq);
}
static void sdhci_timeout_timer(unsigned long data)
{
struct sdhci_host *host;
unsigned long flags;
host = (struct sdhci_host*)data;
spin_lock_irqsave(&host->lock, flags);
if (host->mrq) {
printk(KERN_ERR "%s: Timeout waiting for hardware interrupt. "
"Please report this to " BUGMAIL ".\n",
mmc_hostname(host->mmc));
sdhci_dumpregs(host);
if (host->data) {
host->data->error = MMC_ERR_TIMEOUT;
sdhci_finish_data(host);
} else {
if (host->cmd)
host->cmd->error = MMC_ERR_TIMEOUT;
else
host->mrq->cmd->error = MMC_ERR_TIMEOUT;
tasklet_schedule(&host->finish_tasklet);
}
}
spin_unlock_irqrestore(&host->lock, flags);
}
/*****************************************************************************\
* *
* Interrupt handling *
* *
\*****************************************************************************/
static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask)
{
BUG_ON(intmask == 0);
if (!host->cmd) {
printk(KERN_ERR "%s: Got command interrupt even though no "
"command operation was in progress.\n",
mmc_hostname(host->mmc));
printk(KERN_ERR "%s: Please report this to " BUGMAIL ".\n",
mmc_hostname(host->mmc));
sdhci_dumpregs(host);
return;
}
if (intmask & SDHCI_INT_RESPONSE)
sdhci_finish_command(host);
else {
if (intmask & SDHCI_INT_TIMEOUT)
host->cmd->error = MMC_ERR_TIMEOUT;
else if (intmask & SDHCI_INT_CRC)
host->cmd->error = MMC_ERR_BADCRC;
else if (intmask & (SDHCI_INT_END_BIT | SDHCI_INT_INDEX))
host->cmd->error = MMC_ERR_FAILED;
else
host->cmd->error = MMC_ERR_INVALID;
tasklet_schedule(&host->finish_tasklet);
}
}
static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
{
BUG_ON(intmask == 0);
if (!host->data) {
/*
* A data end interrupt is sent together with the response
* for the stop command.
*/
if (intmask & SDHCI_INT_DATA_END)
return;
printk(KERN_ERR "%s: Got data interrupt even though no "
"data operation was in progress.\n",
mmc_hostname(host->mmc));
printk(KERN_ERR "%s: Please report this to " BUGMAIL ".\n",
mmc_hostname(host->mmc));
sdhci_dumpregs(host);
return;
}
if (intmask & SDHCI_INT_DATA_TIMEOUT)
host->data->error = MMC_ERR_TIMEOUT;
else if (intmask & SDHCI_INT_DATA_CRC)
host->data->error = MMC_ERR_BADCRC;
else if (intmask & SDHCI_INT_DATA_END_BIT)
host->data->error = MMC_ERR_FAILED;
if (host->data->error != MMC_ERR_NONE)
sdhci_finish_data(host);
else {
if (intmask & (SDHCI_INT_BUF_FULL | SDHCI_INT_BUF_EMPTY))
sdhci_transfer_pio(host);
if (intmask & SDHCI_INT_DATA_END)
sdhci_finish_data(host);
}
}
static irqreturn_t sdhci_irq(int irq, void *dev_id, struct pt_regs *regs)
{
irqreturn_t result;
struct sdhci_host* host = dev_id;
u32 intmask;
spin_lock(&host->lock);
intmask = readl(host->ioaddr + SDHCI_INT_STATUS);
if (!intmask) {
result = IRQ_NONE;
goto out;
}
DBG("*** %s got interrupt: 0x%08x\n", host->slot_descr, intmask);
if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE))
tasklet_schedule(&host->card_tasklet);
if (intmask & SDHCI_INT_CMD_MASK) {
sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK);
writel(intmask & SDHCI_INT_CMD_MASK,
host->ioaddr + SDHCI_INT_STATUS);
}
if (intmask & SDHCI_INT_DATA_MASK) {
sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
writel(intmask & SDHCI_INT_DATA_MASK,
host->ioaddr + SDHCI_INT_STATUS);
}
intmask &= ~(SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK);
if (intmask & SDHCI_INT_CARD_INT) {
printk(KERN_ERR "%s: Unexpected card interrupt. Please "
"report this to " BUGMAIL ".\n",
mmc_hostname(host->mmc));
sdhci_dumpregs(host);
}
if (intmask & SDHCI_INT_BUS_POWER) {
printk(KERN_ERR "%s: Unexpected bus power interrupt. Please "
"report this to " BUGMAIL ".\n",
mmc_hostname(host->mmc));
sdhci_dumpregs(host);
}
if (intmask & SDHCI_INT_ACMD12ERR) {
printk(KERN_ERR "%s: Unexpected auto CMD12 error. Please "
"report this to " BUGMAIL ".\n",
mmc_hostname(host->mmc));
sdhci_dumpregs(host);
writew(~0, host->ioaddr + SDHCI_ACMD12_ERR);
}
if (intmask)
writel(intmask, host->ioaddr + SDHCI_INT_STATUS);
result = IRQ_HANDLED;
out:
spin_unlock(&host->lock);
return result;
}
/*****************************************************************************\
* *
* Suspend/resume *
* *
\*****************************************************************************/
#ifdef CONFIG_PM
static int sdhci_suspend (struct pci_dev *pdev, pm_message_t state)
{
struct sdhci_chip *chip;
int i, ret;
chip = pci_get_drvdata(pdev);
if (!chip)
return 0;
DBG("Suspending...\n");
for (i = 0;i < chip->num_slots;i++) {
if (!chip->hosts[i])
continue;
ret = mmc_suspend_host(chip->hosts[i]->mmc, state);
if (ret) {
for (i--;i >= 0;i--)
mmc_resume_host(chip->hosts[i]->mmc);
return ret;
}
}
pci_save_state(pdev);
pci_enable_wake(pdev, pci_choose_state(pdev, state), 0);
pci_disable_device(pdev);
pci_set_power_state(pdev, pci_choose_state(pdev, state));
return 0;
}
static int sdhci_resume (struct pci_dev *pdev)
{
struct sdhci_chip *chip;
int i, ret;
chip = pci_get_drvdata(pdev);
if (!chip)
return 0;
DBG("Resuming...\n");
pci_set_power_state(pdev, PCI_D0);
pci_restore_state(pdev);
pci_enable_device(pdev);
for (i = 0;i < chip->num_slots;i++) {
if (!chip->hosts[i])
continue;
if (chip->hosts[i]->flags & SDHCI_USE_DMA)
pci_set_master(pdev);
sdhci_init(chip->hosts[i]);
ret = mmc_resume_host(chip->hosts[i]->mmc);
if (ret)
return ret;
}
return 0;
}
#else /* CONFIG_PM */
#define sdhci_suspend NULL
#define sdhci_resume NULL
#endif /* CONFIG_PM */
/*****************************************************************************\
* *
* Device probing/removal *
* *
\*****************************************************************************/
static int __devinit sdhci_probe_slot(struct pci_dev *pdev, int slot)
{
int ret;
struct sdhci_chip *chip;
struct mmc_host *mmc;
struct sdhci_host *host;
u8 first_bar;
unsigned int caps;
chip = pci_get_drvdata(pdev);
BUG_ON(!chip);
ret = pci_read_config_byte(pdev, PCI_SLOT_INFO, &first_bar);
if (ret)
return ret;
first_bar &= PCI_SLOT_INFO_FIRST_BAR_MASK;
if (first_bar > 5) {
printk(KERN_ERR DRIVER_NAME ": Invalid first BAR. Aborting.\n");
return -ENODEV;
}
if (!(pci_resource_flags(pdev, first_bar + slot) & IORESOURCE_MEM)) {
printk(KERN_ERR DRIVER_NAME ": BAR is not iomem. Aborting.\n");
return -ENODEV;
}
if (pci_resource_len(pdev, first_bar + slot) != 0x100) {
printk(KERN_ERR DRIVER_NAME ": Invalid iomem size. Aborting.\n");
return -ENODEV;
}
mmc = mmc_alloc_host(sizeof(struct sdhci_host), &pdev->dev);
if (!mmc)
return -ENOMEM;
host = mmc_priv(mmc);
host->mmc = mmc;
host->bar = first_bar + slot;
host->addr = pci_resource_start(pdev, host->bar);
host->irq = pdev->irq;
DBG("slot %d at 0x%08lx, irq %d\n", slot, host->addr, host->irq);
snprintf(host->slot_descr, 20, "sdhci:slot%d", slot);
ret = pci_request_region(pdev, host->bar, host->slot_descr);
if (ret)
goto free;
host->ioaddr = ioremap_nocache(host->addr,
pci_resource_len(pdev, host->bar));
if (!host->ioaddr) {
ret = -ENOMEM;
goto release;
}
caps = readl(host->ioaddr + SDHCI_CAPABILITIES);
if ((caps & SDHCI_CAN_DO_DMA) && ((pdev->class & 0x0000FF) == 0x01))
host->flags |= SDHCI_USE_DMA;
if (host->flags & SDHCI_USE_DMA) {
if (pci_set_dma_mask(pdev, DMA_32BIT_MASK)) {
printk(KERN_WARNING "%s: No suitable DMA available. "
"Falling back to PIO.\n", host->slot_descr);
host->flags &= ~SDHCI_USE_DMA;
}
}
if (host->flags & SDHCI_USE_DMA)
pci_set_master(pdev);
else /* XXX: Hack to get MMC layer to avoid highmem */
pdev->dma_mask = 0;
host->max_clk = (caps & SDHCI_CLOCK_BASE_MASK) >> SDHCI_CLOCK_BASE_SHIFT;
host->max_clk *= 1000000;
/*
* Set host parameters.
*/
mmc->ops = &sdhci_ops;
mmc->f_min = host->max_clk / 256;
mmc->f_max = host->max_clk;
mmc->ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34;
mmc->caps = MMC_CAP_4_BIT_DATA;
spin_lock_init(&host->lock);
/*
* Maximum number of segments. Hardware cannot do scatter lists.
*/
if (host->flags & SDHCI_USE_DMA)
mmc->max_hw_segs = 1;
else
mmc->max_hw_segs = 16;
mmc->max_phys_segs = 16;
/*
* Maximum number of sectors in one transfer. Limited by sector
* count register.
*/
mmc->max_sectors = 0x3FFF;
/*
* Maximum segment size. Could be one segment with the maximum number
* of sectors.
*/
mmc->max_seg_size = mmc->max_sectors * 512;
/*
* Init tasklets.
*/
tasklet_init(&host->card_tasklet,
sdhci_tasklet_card, (unsigned long)host);
tasklet_init(&host->finish_tasklet,
sdhci_tasklet_finish, (unsigned long)host);
setup_timer(&host->timer, sdhci_timeout_timer, (int)host);
ret = request_irq(host->irq, sdhci_irq, SA_SHIRQ,
host->slot_descr, host);
if (ret)
goto unmap;
sdhci_init(host);
#ifdef CONFIG_MMC_DEBUG
sdhci_dumpregs(host);
#endif
host->chip = chip;
chip->hosts[slot] = host;
mmc_add_host(mmc);
printk(KERN_INFO "%s: SDHCI at 0x%08lx irq %d %s\n", mmc_hostname(mmc),
host->addr, host->irq,
(host->flags & SDHCI_USE_DMA)?"DMA":"PIO");
return 0;
unmap:
tasklet_kill(&host->card_tasklet);
tasklet_kill(&host->finish_tasklet);
iounmap(host->ioaddr);
release:
pci_release_region(pdev, host->bar);
free:
mmc_free_host(mmc);
return ret;
}
static void sdhci_remove_slot(struct pci_dev *pdev, int slot)
{
struct sdhci_chip *chip;
struct mmc_host *mmc;
struct sdhci_host *host;
chip = pci_get_drvdata(pdev);
host = chip->hosts[slot];
mmc = host->mmc;
chip->hosts[slot] = NULL;
mmc_remove_host(mmc);
sdhci_reset(host, SDHCI_RESET_ALL);
free_irq(host->irq, host);
del_timer_sync(&host->timer);
tasklet_kill(&host->card_tasklet);
tasklet_kill(&host->finish_tasklet);
iounmap(host->ioaddr);
pci_release_region(pdev, host->bar);
mmc_free_host(mmc);
}
static int __devinit sdhci_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
int ret, i;
u8 slots;
struct sdhci_chip *chip;
BUG_ON(pdev == NULL);
BUG_ON(ent == NULL);
DBG("found at %s\n", pci_name(pdev));
ret = pci_read_config_byte(pdev, PCI_SLOT_INFO, &slots);
if (ret)
return ret;
slots = PCI_SLOT_INFO_SLOTS(slots) + 1;
DBG("found %d slot(s)\n", slots);
if (slots == 0)
return -ENODEV;
ret = pci_enable_device(pdev);
if (ret)
return ret;
chip = kzalloc(sizeof(struct sdhci_chip) +
sizeof(struct sdhci_host*) * slots, GFP_KERNEL);
if (!chip) {
ret = -ENOMEM;
goto err;
}
chip->pdev = pdev;
chip->num_slots = slots;
pci_set_drvdata(pdev, chip);
for (i = 0;i < slots;i++) {
ret = sdhci_probe_slot(pdev, i);
if (ret) {
for (i--;i >= 0;i--)
sdhci_remove_slot(pdev, i);
goto free;
}
}
return 0;
free:
pci_set_drvdata(pdev, NULL);
kfree(chip);
err:
pci_disable_device(pdev);
return ret;
}
static void __devexit sdhci_remove(struct pci_dev *pdev)
{
int i;
struct sdhci_chip *chip;
chip = pci_get_drvdata(pdev);
if (chip) {
for (i = 0;i < chip->num_slots;i++)
sdhci_remove_slot(pdev, i);
pci_set_drvdata(pdev, NULL);
kfree(chip);
}
pci_disable_device(pdev);
}
static struct pci_driver sdhci_driver = {
.name = DRIVER_NAME,
.id_table = pci_ids,
.probe = sdhci_probe,
.remove = __devexit_p(sdhci_remove),
.suspend = sdhci_suspend,
.resume = sdhci_resume,
};
/*****************************************************************************\
* *
* Driver init/exit *
* *
\*****************************************************************************/
static int __init sdhci_drv_init(void)
{
printk(KERN_INFO DRIVER_NAME
": Secure Digital Host Controller Interface driver, "
DRIVER_VERSION "\n");
printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
return pci_register_driver(&sdhci_driver);
}
static void __exit sdhci_drv_exit(void)
{
DBG("Exiting\n");
pci_unregister_driver(&sdhci_driver);
}
module_init(sdhci_drv_init);
module_exit(sdhci_drv_exit);
MODULE_AUTHOR("Pierre Ossman <drzeus@drzeus.cx>");
MODULE_DESCRIPTION("Secure Digital Host Controller Interface driver");
MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL");
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