1
linux/drivers/mmc/sdhci.c

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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 as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*/
#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 "0.12"
#define BUGMAIL "<sdhci-devel@list.drzeus.cx>"
#define DBG(f, x...) \
pr_debug(DRIVER_NAME " [%s()]: " f, __func__,## x)
static unsigned int debug_nodma = 0;
static unsigned int debug_forcedma = 0;
static unsigned int debug_quirks = 0;
#define SDHCI_QUIRK_CLOCK_BEFORE_RESET (1<<0)
#define SDHCI_QUIRK_FORCE_DMA (1<<1)
/* Controller doesn't like some resets when there is no card inserted. */
#define SDHCI_QUIRK_NO_CARD_NO_RESET (1<<2)
static const struct pci_device_id pci_ids[] __devinitdata = {
{
.vendor = PCI_VENDOR_ID_RICOH,
.device = PCI_DEVICE_ID_RICOH_R5C822,
.subvendor = PCI_VENDOR_ID_IBM,
.subdevice = PCI_ANY_ID,
.driver_data = SDHCI_QUIRK_CLOCK_BEFORE_RESET |
SDHCI_QUIRK_FORCE_DMA,
},
{
.vendor = PCI_VENDOR_ID_RICOH,
.device = PCI_DEVICE_ID_RICOH_R5C822,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
.driver_data = SDHCI_QUIRK_FORCE_DMA |
SDHCI_QUIRK_NO_CARD_NO_RESET,
},
{
.vendor = PCI_VENDOR_ID_TI,
.device = PCI_DEVICE_ID_TI_XX21_XX11_SD,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
.driver_data = SDHCI_QUIRK_FORCE_DMA,
},
{ /* Generic 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)
{
unsigned long timeout;
if (host->chip->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) &
SDHCI_CARD_PRESENT))
return;
}
writeb(mask, host->ioaddr + SDHCI_SOFTWARE_RESET);
if (mask & SDHCI_RESET_ALL)
host->clock = 0;
/* Wait max 100 ms */
timeout = 100;
/* hw clears the bit when it's done */
while (readb(host->ioaddr + SDHCI_SOFTWARE_RESET) & mask) {
if (timeout == 0) {
printk(KERN_ERR "%s: Reset 0x%x never completed. "
"Please report this to " BUGMAIL ".\n",
mmc_hostname(host->mmc), (int)mask);
sdhci_dumpregs(host);
return;
}
timeout--;
mdelay(1);
}
}
static void sdhci_init(struct sdhci_host *host)
{
u32 intmask;
sdhci_reset(host, SDHCI_RESET_ALL);
intmask = SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT |
SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT | SDHCI_INT_INDEX |
SDHCI_INT_END_BIT | SDHCI_INT_CRC | SDHCI_INT_TIMEOUT |
SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT |
SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL |
SDHCI_INT_DMA_END | SDHCI_INT_DATA_END | SDHCI_INT_RESPONSE;
writel(intmask, host->ioaddr + SDHCI_INT_ENABLE);
writel(intmask, host->ioaddr + SDHCI_SIGNAL_ENABLE);
}
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_read_block_pio(struct sdhci_host *host)
{
int blksize, chunk_remain;
u32 data;
char *buffer;
int size;
DBG("PIO reading\n");
blksize = host->data->blksz;
chunk_remain = 0;
data = 0;
buffer = sdhci_kmap_sg(host) + host->offset;
while (blksize) {
if (chunk_remain == 0) {
data = readl(host->ioaddr + SDHCI_BUFFER);
chunk_remain = min(blksize, 4);
}
size = min(host->size, host->remain);
size = min(size, chunk_remain);
chunk_remain -= size;
blksize -= size;
host->offset += size;
host->remain -= size;
host->size -= size;
while (size) {
*buffer = data & 0xFF;
buffer++;
data >>= 8;
size--;
}
if (host->remain == 0) {
sdhci_kunmap_sg(host);
if (sdhci_next_sg(host) == 0) {
BUG_ON(blksize != 0);
return;
}
buffer = sdhci_kmap_sg(host);
}
}
sdhci_kunmap_sg(host);
}
static void sdhci_write_block_pio(struct sdhci_host *host)
{
int blksize, chunk_remain;
u32 data;
char *buffer;
int bytes, size;
DBG("PIO writing\n");
blksize = host->data->blksz;
chunk_remain = 4;
data = 0;
bytes = 0;
buffer = sdhci_kmap_sg(host) + host->offset;
while (blksize) {
size = min(host->size, host->remain);
size = min(size, chunk_remain);
chunk_remain -= size;
blksize -= size;
host->offset += size;
host->remain -= size;
host->size -= size;
while (size) {
data >>= 8;
data |= (u32)*buffer << 24;
buffer++;
size--;
}
if (chunk_remain == 0) {
writel(data, host->ioaddr + SDHCI_BUFFER);
chunk_remain = min(blksize, 4);
}
if (host->remain == 0) {
sdhci_kunmap_sg(host);
if (sdhci_next_sg(host) == 0) {
BUG_ON(blksize != 0);
return;
}
buffer = sdhci_kmap_sg(host);
}
}
sdhci_kunmap_sg(host);
}
static void sdhci_transfer_pio(struct sdhci_host *host)
{
u32 mask;
BUG_ON(!host->data);
if (host->size == 0)
return;
if (host->data->flags & MMC_DATA_READ)
mask = SDHCI_DATA_AVAILABLE;
else
mask = SDHCI_SPACE_AVAILABLE;
while (readl(host->ioaddr + SDHCI_PRESENT_STATE) & mask) {
if (host->data->flags & MMC_DATA_READ)
sdhci_read_block_pio(host);
else
sdhci_write_block_pio(host);
if (host->size == 0)
break;
BUG_ON(host->num_sg == 0);
}
DBG("PIO transfer complete.\n");
}
static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data)
{
u8 count;
unsigned target_timeout, current_timeout;
WARN_ON(host->data);
if (data == NULL)
return;
DBG("blksz %04x blks %04x flags %08x\n",
data->blksz, data->blocks, data->flags);
DBG("tsac %d ms nsac %d clk\n",
data->timeout_ns / 1000000, data->timeout_clks);
/* Sanity checks */
BUG_ON(data->blksz * data->blocks > 524288);
BUG_ON(data->blksz > host->max_block);
BUG_ON(data->blocks > 65535);
/* timeout in us */
target_timeout = data->timeout_ns / 1000 +
data->timeout_clks / host->clock;
/*
* Figure out needed cycles.
* We do this in steps in order to fit inside a 32 bit int.
* The first step is the minimum timeout, which will have a
* minimum resolution of 6 bits:
* (1) 2^13*1000 > 2^22,
* (2) host->timeout_clk < 2^16
* =>
* (1) / (2) > 2^6
*/
count = 0;
current_timeout = (1 << 13) * 1000 / host->timeout_clk;
while (current_timeout < target_timeout) {
count++;
current_timeout <<= 1;
if (count >= 0xF)
break;
}
if (count >= 0xF) {
printk(KERN_WARNING "%s: Too large timeout requested!\n",
mmc_hostname(host->mmc));
count = 0xE;
}
writeb(count, host->ioaddr + SDHCI_TIMEOUT_CONTROL);
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 = data->blksz * data->blocks;
host->cur_sg = data->sg;
host->num_sg = data->sg_len;
host->offset = 0;
host->remain = host->cur_sg->length;
}
/* We do not handle DMA boundaries, so set it to max (512 KiB) */
writew(SDHCI_MAKE_BLKSZ(7, data->blksz),
host->ioaddr + SDHCI_BLOCK_SIZE);
writew(data->blocks, host->ioaddr + SDHCI_BLOCK_COUNT);
}
static void sdhci_set_transfer_mode(struct sdhci_host *host,
struct mmc_data *data)
{
u16 mode;
WARN_ON(host->data);
if (data == NULL)
return;
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);
}
static void sdhci_finish_data(struct sdhci_host *host)
{
struct mmc_data *data;
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);
}
/*
* 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 = data->blksz * (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;
} else 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 mask;
unsigned long timeout;
WARN_ON(host->cmd);
DBG("Sending cmd (%x)\n", cmd->opcode);
/* Wait max 10 ms */
timeout = 10;
mask = SDHCI_CMD_INHIBIT;
if ((cmd->data != NULL) || (cmd->flags & MMC_RSP_BUSY))
mask |= SDHCI_DATA_INHIBIT;
/* We shouldn't wait for data inihibit for stop commands, even
though they might use busy signaling */
if (host->mrq->data && (cmd == host->mrq->data->stop))
mask &= ~SDHCI_DATA_INHIBIT;
while (readl(host->ioaddr + SDHCI_PRESENT_STATE) & mask) {
if (timeout == 0) {
printk(KERN_ERR "%s: Controller never released "
"inhibit bit(s). Please report this to "
BUGMAIL ".\n", mmc_hostname(host->mmc));
sdhci_dumpregs(host);
cmd->error = MMC_ERR_FAILED;
tasklet_schedule(&host->finish_tasklet);
return;
}
timeout--;
mdelay(1);
}
mod_timer(&host->timer, jiffies + 10 * HZ);
host->cmd = cmd;
sdhci_prepare_data(host, cmd->data);
writel(cmd->arg, host->ioaddr + SDHCI_ARGUMENT);
sdhci_set_transfer_mode(host, cmd->data);
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;
writew(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)
host->data = host->cmd->data;
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 timeout;
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 */
timeout = 10;
while (!((clk = readw(host->ioaddr + SDHCI_CLOCK_CONTROL))
& SDHCI_CLOCK_INT_STABLE)) {
if (timeout == 0) {
printk(KERN_ERR "%s: Internal clock never stabilised. "
"Please report this to " BUGMAIL ".\n",
mmc_hostname(host->mmc));
sdhci_dumpregs(host);
return;
}
timeout--;
mdelay(1);
}
clk |= SDHCI_CLOCK_CARD_EN;
writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
out:
host->clock = clock;
}
static void sdhci_set_power(struct sdhci_host *host, unsigned short power)
{
u8 pwr;
if (host->power == power)
return;
writeb(0, host->ioaddr + SDHCI_POWER_CONTROL);
if (power == (unsigned short)-1)
goto out;
pwr = SDHCI_POWER_ON;
switch (power) {
case MMC_VDD_170:
case MMC_VDD_180:
case MMC_VDD_190:
pwr |= SDHCI_POWER_180;
break;
case MMC_VDD_290:
case MMC_VDD_300:
case MMC_VDD_310:
pwr |= SDHCI_POWER_300;
break;
case MMC_VDD_320:
case MMC_VDD_330:
case MMC_VDD_340:
pwr |= SDHCI_POWER_330;
break;
default:
BUG();
}
writeb(pwr, host->ioaddr + SDHCI_POWER_CONTROL);
out:
host->power = power;
}
/*****************************************************************************\
* *
* 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);
mmiowb();
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);
/*
* 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);
sdhci_init(host);
}
sdhci_set_clock(host, ios->clock);
if (ios->power_mode == MMC_POWER_OFF)
sdhci_set_power(host, -1);
else
sdhci_set_power(host, ios->vdd);
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);
mmiowb();
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))))) {
/* Some controllers need this kick or reset won't work here */
if (host->chip->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET) {
unsigned int clock;
/* This is to force an update */
clock = host->clock;
host->clock = 0;
sdhci_set_clock(host, clock);
}
/* Spec says we should do both at the same time, but Ricoh
controllers do not like that. */
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);
mmiowb();
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);
}
}
mmiowb();
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_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
sdhci_transfer_pio(host);
if (intmask & SDHCI_INT_DATA_END)
sdhci_finish_data(host);
}
}
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 06:55:46 -07:00
static irqreturn_t sdhci_irq(int irq, void *dev_id)
{
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)) {
writel(intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE),
host->ioaddr + SDHCI_INT_STATUS);
tasklet_schedule(&host->card_tasklet);
}
intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE);
if (intmask & SDHCI_INT_CMD_MASK) {
writel(intmask & SDHCI_INT_CMD_MASK,
host->ioaddr + SDHCI_INT_STATUS);
sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK);
}
if (intmask & SDHCI_INT_DATA_MASK) {
writel(intmask & SDHCI_INT_DATA_MASK,
host->ioaddr + SDHCI_INT_STATUS);
sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
}
intmask &= ~(SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK);
if (intmask & SDHCI_INT_BUS_POWER) {
printk(KERN_ERR "%s: Card is consuming too much power!\n",
mmc_hostname(host->mmc));
writel(SDHCI_INT_BUS_POWER, host->ioaddr + SDHCI_INT_STATUS);
}
intmask &= SDHCI_INT_BUS_POWER;
if (intmask) {
printk(KERN_ERR "%s: Unexpected interrupt 0x%08x. Please "
"report this to " BUGMAIL ".\n",
mmc_hostname(host->mmc), intmask);
sdhci_dumpregs(host);
writel(intmask, host->ioaddr + SDHCI_INT_STATUS);
}
result = IRQ_HANDLED;
mmiowb();
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]);
mmiowb();
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;
unsigned int version;
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;
}
if ((pdev->class & 0x0000FF) == PCI_SDHCI_IFVENDOR) {
printk(KERN_ERR DRIVER_NAME ": Vendor specific interface. Aborting.\n");
return -ENODEV;
}
if ((pdev->class & 0x0000FF) > PCI_SDHCI_IFVENDOR) {
printk(KERN_ERR DRIVER_NAME ": Unknown interface. 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->chip = chip;
chip->hosts[slot] = host;
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;
}
sdhci_reset(host, SDHCI_RESET_ALL);
version = readw(host->ioaddr + SDHCI_HOST_VERSION);
version = (version & SDHCI_SPEC_VER_MASK) >> SDHCI_SPEC_VER_SHIFT;
if (version != 0) {
printk(KERN_ERR "%s: Unknown controller version (%d). "
"You may experience problems.\n", host->slot_descr,
version);
}
caps = readl(host->ioaddr + SDHCI_CAPABILITIES);
if (debug_nodma)
DBG("DMA forced off\n");
else if (debug_forcedma) {
DBG("DMA forced on\n");
host->flags |= SDHCI_USE_DMA;
} else if (chip->quirks & SDHCI_QUIRK_FORCE_DMA)
host->flags |= SDHCI_USE_DMA;
else if ((pdev->class & 0x0000FF) != PCI_SDHCI_IFDMA)
DBG("Controller doesn't have DMA interface\n");
else if (!(caps & SDHCI_CAN_DO_DMA))
DBG("Controller doesn't have DMA capability\n");
else
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;
if (host->max_clk == 0) {
printk(KERN_ERR "%s: Hardware doesn't specify base clock "
"frequency.\n", host->slot_descr);
ret = -ENODEV;
goto unmap;
}
host->max_clk *= 1000000;
host->timeout_clk =
(caps & SDHCI_TIMEOUT_CLK_MASK) >> SDHCI_TIMEOUT_CLK_SHIFT;
if (host->timeout_clk == 0) {
printk(KERN_ERR "%s: Hardware doesn't specify timeout clock "
"frequency.\n", host->slot_descr);
ret = -ENODEV;
goto unmap;
}
if (caps & SDHCI_TIMEOUT_CLK_UNIT)
host->timeout_clk *= 1000;
host->max_block = (caps & SDHCI_MAX_BLOCK_MASK) >> SDHCI_MAX_BLOCK_SHIFT;
if (host->max_block >= 3) {
printk(KERN_ERR "%s: Invalid maximum block size.\n",
host->slot_descr);
ret = -ENODEV;
goto unmap;
}
host->max_block = 512 << host->max_block;
/*
* Set host parameters.
*/
mmc->ops = &sdhci_ops;
mmc->f_min = host->max_clk / 256;
mmc->f_max = host->max_clk;
mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_MULTIWRITE | MMC_CAP_BYTEBLOCK;
mmc->ocr_avail = 0;
if (caps & SDHCI_CAN_VDD_330)
mmc->ocr_avail |= MMC_VDD_32_33|MMC_VDD_33_34;
else if (caps & SDHCI_CAN_VDD_300)
mmc->ocr_avail |= MMC_VDD_29_30|MMC_VDD_30_31;
else if (caps & SDHCI_CAN_VDD_180)
mmc->ocr_avail |= MMC_VDD_17_18|MMC_VDD_18_19;
if (mmc->ocr_avail == 0) {
printk(KERN_ERR "%s: Hardware doesn't report any "
"support voltages.\n", host->slot_descr);
ret = -ENODEV;
goto unmap;
}
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 DMA boundary
* size (512KiB), which means (512 KiB/512=) 1024 entries.
*/
mmc->max_sectors = 1024;
/*
* 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, (long)host);
ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
host->slot_descr, host);
if (ret)
goto untasklet;
sdhci_init(host);
#ifdef CONFIG_MMC_DEBUG
sdhci_dumpregs(host);
#endif
mmiowb();
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;
untasklet:
tasklet_kill(&host->card_tasklet);
tasklet_kill(&host->finish_tasklet);
unmap:
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, rev;
struct sdhci_chip *chip;
BUG_ON(pdev == NULL);
BUG_ON(ent == NULL);
pci_read_config_byte(pdev, PCI_CLASS_REVISION, &rev);
printk(KERN_INFO DRIVER_NAME
": SDHCI controller found at %s [%04x:%04x] (rev %x)\n",
pci_name(pdev), (int)pdev->vendor, (int)pdev->device,
(int)rev);
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->quirks = ent->driver_data;
if (debug_quirks)
chip->quirks = debug_quirks;
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_param(debug_nodma, uint, 0444);
module_param(debug_forcedma, uint, 0444);
module_param(debug_quirks, uint, 0444);
MODULE_AUTHOR("Pierre Ossman <drzeus@drzeus.cx>");
MODULE_DESCRIPTION("Secure Digital Host Controller Interface driver");
MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL");
MODULE_PARM_DESC(debug_nodma, "Forcefully disable DMA transfers. (default 0)");
MODULE_PARM_DESC(debug_forcedma, "Forcefully enable DMA transfers. (default 0)");
MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");