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linux-sg2042/drivers/mmc/host/wbsd.c

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/*
* linux/drivers/mmc/wbsd.c - Winbond W83L51xD SD/MMC driver
*
* Copyright (C) 2004-2007 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.
*
*
* Warning!
*
* Changes to the FIFO system should be done with extreme care since
* the hardware is full of bugs related to the FIFO. Known issues are:
*
* - FIFO size field in FSR is always zero.
*
* - FIFO interrupts tend not to work as they should. Interrupts are
* triggered only for full/empty events, not for threshold values.
*
* - On APIC systems the FIFO empty interrupt is sometimes lost.
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/pnp.h>
#include <linux/highmem.h>
#include <linux/mmc/host.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/scatterlist.h>
#include "wbsd.h"
#define DRIVER_NAME "wbsd"
#define DBG(x...) \
pr_debug(DRIVER_NAME ": " x)
#define DBGF(f, x...) \
pr_debug(DRIVER_NAME " [%s()]: " f, __func__ , ##x)
/*
* Device resources
*/
#ifdef CONFIG_PNP
static const struct pnp_device_id pnp_dev_table[] = {
{ "WEC0517", 0 },
{ "WEC0518", 0 },
{ "", 0 },
};
MODULE_DEVICE_TABLE(pnp, pnp_dev_table);
#endif /* CONFIG_PNP */
static const int config_ports[] = { 0x2E, 0x4E };
static const int unlock_codes[] = { 0x83, 0x87 };
static const int valid_ids[] = {
0x7112,
};
#ifdef CONFIG_PNP
static unsigned int nopnp = 0;
#else
static const unsigned int nopnp = 1;
#endif
static unsigned int io = 0x248;
static unsigned int irq = 6;
static int dma = 2;
/*
* Basic functions
*/
static inline void wbsd_unlock_config(struct wbsd_host *host)
{
BUG_ON(host->config == 0);
outb(host->unlock_code, host->config);
outb(host->unlock_code, host->config);
}
static inline void wbsd_lock_config(struct wbsd_host *host)
{
BUG_ON(host->config == 0);
outb(LOCK_CODE, host->config);
}
static inline void wbsd_write_config(struct wbsd_host *host, u8 reg, u8 value)
{
BUG_ON(host->config == 0);
outb(reg, host->config);
outb(value, host->config + 1);
}
static inline u8 wbsd_read_config(struct wbsd_host *host, u8 reg)
{
BUG_ON(host->config == 0);
outb(reg, host->config);
return inb(host->config + 1);
}
static inline void wbsd_write_index(struct wbsd_host *host, u8 index, u8 value)
{
outb(index, host->base + WBSD_IDXR);
outb(value, host->base + WBSD_DATAR);
}
static inline u8 wbsd_read_index(struct wbsd_host *host, u8 index)
{
outb(index, host->base + WBSD_IDXR);
return inb(host->base + WBSD_DATAR);
}
/*
* Common routines
*/
static void wbsd_init_device(struct wbsd_host *host)
{
u8 setup, ier;
/*
* Reset chip (SD/MMC part) and fifo.
*/
setup = wbsd_read_index(host, WBSD_IDX_SETUP);
setup |= WBSD_FIFO_RESET | WBSD_SOFT_RESET;
wbsd_write_index(host, WBSD_IDX_SETUP, setup);
/*
* Set DAT3 to input
*/
setup &= ~WBSD_DAT3_H;
wbsd_write_index(host, WBSD_IDX_SETUP, setup);
host->flags &= ~WBSD_FIGNORE_DETECT;
/*
* Read back default clock.
*/
host->clk = wbsd_read_index(host, WBSD_IDX_CLK);
/*
* Power down port.
*/
outb(WBSD_POWER_N, host->base + WBSD_CSR);
/*
* Set maximum timeout.
*/
wbsd_write_index(host, WBSD_IDX_TAAC, 0x7F);
/*
* Test for card presence
*/
if (inb(host->base + WBSD_CSR) & WBSD_CARDPRESENT)
host->flags |= WBSD_FCARD_PRESENT;
else
host->flags &= ~WBSD_FCARD_PRESENT;
/*
* Enable interesting interrupts.
*/
ier = 0;
ier |= WBSD_EINT_CARD;
ier |= WBSD_EINT_FIFO_THRE;
ier |= WBSD_EINT_CRC;
ier |= WBSD_EINT_TIMEOUT;
ier |= WBSD_EINT_TC;
outb(ier, host->base + WBSD_EIR);
/*
* Clear interrupts.
*/
inb(host->base + WBSD_ISR);
}
static void wbsd_reset(struct wbsd_host *host)
{
u8 setup;
printk(KERN_ERR "%s: Resetting chip\n", mmc_hostname(host->mmc));
/*
* Soft reset of chip (SD/MMC part).
*/
setup = wbsd_read_index(host, WBSD_IDX_SETUP);
setup |= WBSD_SOFT_RESET;
wbsd_write_index(host, WBSD_IDX_SETUP, setup);
}
static void wbsd_request_end(struct wbsd_host *host, struct mmc_request *mrq)
{
unsigned long dmaflags;
DBGF("Ending request, cmd (%x)\n", mrq->cmd->opcode);
if (host->dma >= 0) {
/*
* Release ISA DMA controller.
*/
dmaflags = claim_dma_lock();
disable_dma(host->dma);
clear_dma_ff(host->dma);
release_dma_lock(dmaflags);
/*
* Disable DMA on host.
*/
wbsd_write_index(host, WBSD_IDX_DMA, 0);
}
host->mrq = NULL;
/*
* MMC layer might call back into the driver so first unlock.
*/
spin_unlock(&host->lock);
mmc_request_done(host->mmc, mrq);
spin_lock(&host->lock);
}
/*
* Scatter/gather functions
*/
static inline void wbsd_init_sg(struct wbsd_host *host, struct mmc_data *data)
{
/*
* Get info. about SG list from data structure.
*/
host->cur_sg = data->sg;
host->num_sg = data->sg_len;
host->offset = 0;
host->remain = host->cur_sg->length;
}
static inline int wbsd_next_sg(struct wbsd_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 inline char *wbsd_sg_to_buffer(struct wbsd_host *host)
{
return page_address(host->cur_sg->page) + host->cur_sg->offset;
}
static inline void wbsd_sg_to_dma(struct wbsd_host *host, struct mmc_data *data)
{
unsigned int len, i;
struct scatterlist *sg;
char *dmabuf = host->dma_buffer;
char *sgbuf;
sg = data->sg;
len = data->sg_len;
for (i = 0; i < len; i++) {
sgbuf = page_address(sg[i].page) + sg[i].offset;
memcpy(dmabuf, sgbuf, sg[i].length);
dmabuf += sg[i].length;
}
}
static inline void wbsd_dma_to_sg(struct wbsd_host *host, struct mmc_data *data)
{
unsigned int len, i;
struct scatterlist *sg;
char *dmabuf = host->dma_buffer;
char *sgbuf;
sg = data->sg;
len = data->sg_len;
for (i = 0; i < len; i++) {
sgbuf = page_address(sg[i].page) + sg[i].offset;
memcpy(sgbuf, dmabuf, sg[i].length);
dmabuf += sg[i].length;
}
}
/*
* Command handling
*/
static inline void wbsd_get_short_reply(struct wbsd_host *host,
struct mmc_command *cmd)
{
/*
* Correct response type?
*/
if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_SHORT) {
cmd->error = MMC_ERR_INVALID;
return;
}
cmd->resp[0] = wbsd_read_index(host, WBSD_IDX_RESP12) << 24;
cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP13) << 16;
cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP14) << 8;
cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP15) << 0;
cmd->resp[1] = wbsd_read_index(host, WBSD_IDX_RESP16) << 24;
}
static inline void wbsd_get_long_reply(struct wbsd_host *host,
struct mmc_command *cmd)
{
int i;
/*
* Correct response type?
*/
if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_LONG) {
cmd->error = MMC_ERR_INVALID;
return;
}
for (i = 0; i < 4; i++) {
cmd->resp[i] =
wbsd_read_index(host, WBSD_IDX_RESP1 + i * 4) << 24;
cmd->resp[i] |=
wbsd_read_index(host, WBSD_IDX_RESP2 + i * 4) << 16;
cmd->resp[i] |=
wbsd_read_index(host, WBSD_IDX_RESP3 + i * 4) << 8;
cmd->resp[i] |=
wbsd_read_index(host, WBSD_IDX_RESP4 + i * 4) << 0;
}
}
static void wbsd_send_command(struct wbsd_host *host, struct mmc_command *cmd)
{
int i;
u8 status, isr;
DBGF("Sending cmd (%x)\n", cmd->opcode);
/*
* Clear accumulated ISR. The interrupt routine
* will fill this one with events that occur during
* transfer.
*/
host->isr = 0;
/*
* Send the command (CRC calculated by host).
*/
outb(cmd->opcode, host->base + WBSD_CMDR);
for (i = 3; i >= 0; i--)
outb((cmd->arg >> (i * 8)) & 0xff, host->base + WBSD_CMDR);
cmd->error = MMC_ERR_NONE;
/*
* Wait for the request to complete.
*/
do {
status = wbsd_read_index(host, WBSD_IDX_STATUS);
} while (status & WBSD_CARDTRAFFIC);
/*
* Do we expect a reply?
*/
if (cmd->flags & MMC_RSP_PRESENT) {
/*
* Read back status.
*/
isr = host->isr;
/* Card removed? */
if (isr & WBSD_INT_CARD)
cmd->error = MMC_ERR_TIMEOUT;
/* Timeout? */
else if (isr & WBSD_INT_TIMEOUT)
cmd->error = MMC_ERR_TIMEOUT;
/* CRC? */
else if ((cmd->flags & MMC_RSP_CRC) && (isr & WBSD_INT_CRC))
cmd->error = MMC_ERR_BADCRC;
/* All ok */
else {
if (cmd->flags & MMC_RSP_136)
wbsd_get_long_reply(host, cmd);
else
wbsd_get_short_reply(host, cmd);
}
}
DBGF("Sent cmd (%x), res %d\n", cmd->opcode, cmd->error);
}
/*
* Data functions
*/
static void wbsd_empty_fifo(struct wbsd_host *host)
{
struct mmc_data *data = host->mrq->cmd->data;
char *buffer;
int i, fsr, fifo;
/*
* Handle excessive data.
*/
if (host->num_sg == 0)
return;
buffer = wbsd_sg_to_buffer(host) + host->offset;
/*
* Drain the fifo. This has a tendency to loop longer
* than the FIFO length (usually one block).
*/
while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_EMPTY)) {
/*
* The size field in the FSR is broken so we have to
* do some guessing.
*/
if (fsr & WBSD_FIFO_FULL)
fifo = 16;
else if (fsr & WBSD_FIFO_FUTHRE)
fifo = 8;
else
fifo = 1;
for (i = 0; i < fifo; i++) {
*buffer = inb(host->base + WBSD_DFR);
buffer++;
host->offset++;
host->remain--;
data->bytes_xfered++;
/*
* End of scatter list entry?
*/
if (host->remain == 0) {
/*
* Get next entry. Check if last.
*/
if (!wbsd_next_sg(host))
return;
buffer = wbsd_sg_to_buffer(host);
}
}
}
/*
* This is a very dirty hack to solve a
* hardware problem. The chip doesn't trigger
* FIFO threshold interrupts properly.
*/
if ((data->blocks * data->blksz - data->bytes_xfered) < 16)
tasklet_schedule(&host->fifo_tasklet);
}
static void wbsd_fill_fifo(struct wbsd_host *host)
{
struct mmc_data *data = host->mrq->cmd->data;
char *buffer;
int i, fsr, fifo;
/*
* Check that we aren't being called after the
* entire buffer has been transfered.
*/
if (host->num_sg == 0)
return;
buffer = wbsd_sg_to_buffer(host) + host->offset;
/*
* Fill the fifo. This has a tendency to loop longer
* than the FIFO length (usually one block).
*/
while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_FULL)) {
/*
* The size field in the FSR is broken so we have to
* do some guessing.
*/
if (fsr & WBSD_FIFO_EMPTY)
fifo = 0;
else if (fsr & WBSD_FIFO_EMTHRE)
fifo = 8;
else
fifo = 15;
for (i = 16; i > fifo; i--) {
outb(*buffer, host->base + WBSD_DFR);
buffer++;
host->offset++;
host->remain--;
data->bytes_xfered++;
/*
* End of scatter list entry?
*/
if (host->remain == 0) {
/*
* Get next entry. Check if last.
*/
if (!wbsd_next_sg(host))
return;
buffer = wbsd_sg_to_buffer(host);
}
}
}
/*
* The controller stops sending interrupts for
* 'FIFO empty' under certain conditions. So we
* need to be a bit more pro-active.
*/
tasklet_schedule(&host->fifo_tasklet);
}
static void wbsd_prepare_data(struct wbsd_host *host, struct mmc_data *data)
{
u16 blksize;
u8 setup;
unsigned long dmaflags;
unsigned int size;
DBGF("blksz %04x blks %04x flags %08x\n",
data->blksz, data->blocks, data->flags);
DBGF("tsac %d ms nsac %d clk\n",
data->timeout_ns / 1000000, data->timeout_clks);
/*
* Calculate size.
*/
size = data->blocks * data->blksz;
/*
* Check timeout values for overflow.
* (Yes, some cards cause this value to overflow).
*/
if (data->timeout_ns > 127000000)
wbsd_write_index(host, WBSD_IDX_TAAC, 127);
else {
wbsd_write_index(host, WBSD_IDX_TAAC,
data->timeout_ns / 1000000);
}
if (data->timeout_clks > 255)
wbsd_write_index(host, WBSD_IDX_NSAC, 255);
else
wbsd_write_index(host, WBSD_IDX_NSAC, data->timeout_clks);
/*
* Inform the chip of how large blocks will be
* sent. It needs this to determine when to
* calculate CRC.
*
* Space for CRC must be included in the size.
* Two bytes are needed for each data line.
*/
if (host->bus_width == MMC_BUS_WIDTH_1) {
blksize = data->blksz + 2;
wbsd_write_index(host, WBSD_IDX_PBSMSB, (blksize >> 4) & 0xF0);
wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
} else if (host->bus_width == MMC_BUS_WIDTH_4) {
blksize = data->blksz + 2 * 4;
wbsd_write_index(host, WBSD_IDX_PBSMSB,
((blksize >> 4) & 0xF0) | WBSD_DATA_WIDTH);
wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
} else {
data->error = MMC_ERR_INVALID;
return;
}
/*
* Clear the FIFO. This is needed even for DMA
* transfers since the chip still uses the FIFO
* internally.
*/
setup = wbsd_read_index(host, WBSD_IDX_SETUP);
setup |= WBSD_FIFO_RESET;
wbsd_write_index(host, WBSD_IDX_SETUP, setup);
/*
* DMA transfer?
*/
if (host->dma >= 0) {
/*
* The buffer for DMA is only 64 kB.
*/
BUG_ON(size > 0x10000);
if (size > 0x10000) {
data->error = MMC_ERR_INVALID;
return;
}
/*
* Transfer data from the SG list to
* the DMA buffer.
*/
if (data->flags & MMC_DATA_WRITE)
wbsd_sg_to_dma(host, data);
/*
* Initialise the ISA DMA controller.
*/
dmaflags = claim_dma_lock();
disable_dma(host->dma);
clear_dma_ff(host->dma);
if (data->flags & MMC_DATA_READ)
set_dma_mode(host->dma, DMA_MODE_READ & ~0x40);
else
set_dma_mode(host->dma, DMA_MODE_WRITE & ~0x40);
set_dma_addr(host->dma, host->dma_addr);
set_dma_count(host->dma, size);
enable_dma(host->dma);
release_dma_lock(dmaflags);
/*
* Enable DMA on the host.
*/
wbsd_write_index(host, WBSD_IDX_DMA, WBSD_DMA_ENABLE);
} else {
/*
* This flag is used to keep printk
* output to a minimum.
*/
host->firsterr = 1;
/*
* Initialise the SG list.
*/
wbsd_init_sg(host, data);
/*
* Turn off DMA.
*/
wbsd_write_index(host, WBSD_IDX_DMA, 0);
/*
* Set up FIFO threshold levels (and fill
* buffer if doing a write).
*/
if (data->flags & MMC_DATA_READ) {
wbsd_write_index(host, WBSD_IDX_FIFOEN,
WBSD_FIFOEN_FULL | 8);
} else {
wbsd_write_index(host, WBSD_IDX_FIFOEN,
WBSD_FIFOEN_EMPTY | 8);
wbsd_fill_fifo(host);
}
}
data->error = MMC_ERR_NONE;
}
static void wbsd_finish_data(struct wbsd_host *host, struct mmc_data *data)
{
unsigned long dmaflags;
int count;
u8 status;
WARN_ON(host->mrq == NULL);
/*
* Send a stop command if needed.
*/
if (data->stop)
wbsd_send_command(host, data->stop);
/*
* Wait for the controller to leave data
* transfer state.
*/
do {
status = wbsd_read_index(host, WBSD_IDX_STATUS);
} while (status & (WBSD_BLOCK_READ | WBSD_BLOCK_WRITE));
/*
* DMA transfer?
*/
if (host->dma >= 0) {
/*
* Disable DMA on the host.
*/
wbsd_write_index(host, WBSD_IDX_DMA, 0);
/*
* Turn of ISA DMA controller.
*/
dmaflags = claim_dma_lock();
disable_dma(host->dma);
clear_dma_ff(host->dma);
count = get_dma_residue(host->dma);
release_dma_lock(dmaflags);
data->bytes_xfered = host->mrq->data->blocks *
host->mrq->data->blksz - count;
data->bytes_xfered -= data->bytes_xfered % data->blksz;
/*
* Any leftover data?
*/
if (count) {
printk(KERN_ERR "%s: Incomplete DMA transfer. "
"%d bytes left.\n",
mmc_hostname(host->mmc), count);
if (data->error == MMC_ERR_NONE)
data->error = MMC_ERR_FAILED;
} else {
/*
* Transfer data from DMA buffer to
* SG list.
*/
if (data->flags & MMC_DATA_READ)
wbsd_dma_to_sg(host, data);
}
if (data->error != MMC_ERR_NONE) {
if (data->bytes_xfered)
data->bytes_xfered -= data->blksz;
}
}
DBGF("Ending data transfer (%d bytes)\n", data->bytes_xfered);
wbsd_request_end(host, host->mrq);
}
/*****************************************************************************\
* *
* MMC layer callbacks *
* *
\*****************************************************************************/
static void wbsd_request(struct mmc_host *mmc, struct mmc_request *mrq)
{
struct wbsd_host *host = mmc_priv(mmc);
struct mmc_command *cmd;
/*
* Disable tasklets to avoid a deadlock.
*/
spin_lock_bh(&host->lock);
BUG_ON(host->mrq != NULL);
cmd = mrq->cmd;
host->mrq = mrq;
/*
* If there is no card in the slot then
* timeout immediatly.
*/
if (!(host->flags & WBSD_FCARD_PRESENT)) {
cmd->error = MMC_ERR_TIMEOUT;
goto done;
}
if (cmd->data) {
/*
* The hardware is so delightfully stupid that it has a list
* of "data" commands. If a command isn't on this list, it'll
* just go back to the idle state and won't send any data
* interrupts.
*/
switch (cmd->opcode) {
case 11:
case 17:
case 18:
case 20:
case 24:
case 25:
case 26:
case 27:
case 30:
case 42:
case 56:
break;
/* ACMDs. We don't keep track of state, so we just treat them
* like any other command. */
case 51:
break;
default:
#ifdef CONFIG_MMC_DEBUG
printk(KERN_WARNING "%s: Data command %d is not "
"supported by this controller.\n",
mmc_hostname(host->mmc), cmd->opcode);
#endif
cmd->error = MMC_ERR_INVALID;
goto done;
};
}
/*
* Does the request include data?
*/
if (cmd->data) {
wbsd_prepare_data(host, cmd->data);
if (cmd->data->error != MMC_ERR_NONE)
goto done;
}
wbsd_send_command(host, cmd);
/*
* If this is a data transfer the request
* will be finished after the data has
* transfered.
*/
if (cmd->data && (cmd->error == MMC_ERR_NONE)) {
/*
* Dirty fix for hardware bug.
*/
if (host->dma == -1)
tasklet_schedule(&host->fifo_tasklet);
spin_unlock_bh(&host->lock);
return;
}
done:
wbsd_request_end(host, mrq);
spin_unlock_bh(&host->lock);
}
static void wbsd_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct wbsd_host *host = mmc_priv(mmc);
u8 clk, setup, pwr;
spin_lock_bh(&host->lock);
/*
* Reset the chip on each power off.
* Should clear out any weird states.
*/
if (ios->power_mode == MMC_POWER_OFF)
wbsd_init_device(host);
if (ios->clock >= 24000000)
clk = WBSD_CLK_24M;
else if (ios->clock >= 16000000)
clk = WBSD_CLK_16M;
else if (ios->clock >= 12000000)
clk = WBSD_CLK_12M;
else
clk = WBSD_CLK_375K;
/*
* Only write to the clock register when
* there is an actual change.
*/
if (clk != host->clk) {
wbsd_write_index(host, WBSD_IDX_CLK, clk);
host->clk = clk;
}
/*
* Power up card.
*/
if (ios->power_mode != MMC_POWER_OFF) {
pwr = inb(host->base + WBSD_CSR);
pwr &= ~WBSD_POWER_N;
outb(pwr, host->base + WBSD_CSR);
}
/*
* MMC cards need to have pin 1 high during init.
* It wreaks havoc with the card detection though so
* that needs to be disabled.
*/
setup = wbsd_read_index(host, WBSD_IDX_SETUP);
if (ios->chip_select == MMC_CS_HIGH) {
BUG_ON(ios->bus_width != MMC_BUS_WIDTH_1);
setup |= WBSD_DAT3_H;
host->flags |= WBSD_FIGNORE_DETECT;
} else {
if (setup & WBSD_DAT3_H) {
setup &= ~WBSD_DAT3_H;
/*
* We cannot resume card detection immediatly
* because of capacitance and delays in the chip.
*/
mod_timer(&host->ignore_timer, jiffies + HZ / 100);
}
}
wbsd_write_index(host, WBSD_IDX_SETUP, setup);
/*
* Store bus width for later. Will be used when
* setting up the data transfer.
*/
host->bus_width = ios->bus_width;
spin_unlock_bh(&host->lock);
}
static int wbsd_get_ro(struct mmc_host *mmc)
{
struct wbsd_host *host = mmc_priv(mmc);
u8 csr;
spin_lock_bh(&host->lock);
csr = inb(host->base + WBSD_CSR);
csr |= WBSD_MSLED;
outb(csr, host->base + WBSD_CSR);
mdelay(1);
csr = inb(host->base + WBSD_CSR);
csr &= ~WBSD_MSLED;
outb(csr, host->base + WBSD_CSR);
spin_unlock_bh(&host->lock);
return csr & WBSD_WRPT;
}
static const struct mmc_host_ops wbsd_ops = {
.request = wbsd_request,
.set_ios = wbsd_set_ios,
.get_ro = wbsd_get_ro,
};
/*****************************************************************************\
* *
* Interrupt handling *
* *
\*****************************************************************************/
/*
* Helper function to reset detection ignore
*/
static void wbsd_reset_ignore(unsigned long data)
{
struct wbsd_host *host = (struct wbsd_host *)data;
BUG_ON(host == NULL);
DBG("Resetting card detection ignore\n");
spin_lock_bh(&host->lock);
host->flags &= ~WBSD_FIGNORE_DETECT;
/*
* Card status might have changed during the
* blackout.
*/
tasklet_schedule(&host->card_tasklet);
spin_unlock_bh(&host->lock);
}
/*
* Tasklets
*/
static inline struct mmc_data *wbsd_get_data(struct wbsd_host *host)
{
WARN_ON(!host->mrq);
if (!host->mrq)
return NULL;
WARN_ON(!host->mrq->cmd);
if (!host->mrq->cmd)
return NULL;
WARN_ON(!host->mrq->cmd->data);
if (!host->mrq->cmd->data)
return NULL;
return host->mrq->cmd->data;
}
static void wbsd_tasklet_card(unsigned long param)
{
struct wbsd_host *host = (struct wbsd_host *)param;
u8 csr;
int delay = -1;
spin_lock(&host->lock);
if (host->flags & WBSD_FIGNORE_DETECT) {
spin_unlock(&host->lock);
return;
}
csr = inb(host->base + WBSD_CSR);
WARN_ON(csr == 0xff);
if (csr & WBSD_CARDPRESENT) {
if (!(host->flags & WBSD_FCARD_PRESENT)) {
DBG("Card inserted\n");
host->flags |= WBSD_FCARD_PRESENT;
delay = 500;
}
} else if (host->flags & WBSD_FCARD_PRESENT) {
DBG("Card removed\n");
host->flags &= ~WBSD_FCARD_PRESENT;
if (host->mrq) {
printk(KERN_ERR "%s: Card removed during transfer!\n",
mmc_hostname(host->mmc));
wbsd_reset(host);
host->mrq->cmd->error = MMC_ERR_FAILED;
tasklet_schedule(&host->finish_tasklet);
}
delay = 0;
}
/*
* Unlock first since we might get a call back.
*/
spin_unlock(&host->lock);
if (delay != -1)
mmc_detect_change(host->mmc, msecs_to_jiffies(delay));
}
static void wbsd_tasklet_fifo(unsigned long param)
{
struct wbsd_host *host = (struct wbsd_host *)param;
struct mmc_data *data;
spin_lock(&host->lock);
if (!host->mrq)
goto end;
data = wbsd_get_data(host);
if (!data)
goto end;
if (data->flags & MMC_DATA_WRITE)
wbsd_fill_fifo(host);
else
wbsd_empty_fifo(host);
/*
* Done?
*/
if (host->num_sg == 0) {
wbsd_write_index(host, WBSD_IDX_FIFOEN, 0);
tasklet_schedule(&host->finish_tasklet);
}
end:
spin_unlock(&host->lock);
}
static void wbsd_tasklet_crc(unsigned long param)
{
struct wbsd_host *host = (struct wbsd_host *)param;
struct mmc_data *data;
spin_lock(&host->lock);
if (!host->mrq)
goto end;
data = wbsd_get_data(host);
if (!data)
goto end;
DBGF("CRC error\n");
data->error = MMC_ERR_BADCRC;
tasklet_schedule(&host->finish_tasklet);
end:
spin_unlock(&host->lock);
}
static void wbsd_tasklet_timeout(unsigned long param)
{
struct wbsd_host *host = (struct wbsd_host *)param;
struct mmc_data *data;
spin_lock(&host->lock);
if (!host->mrq)
goto end;
data = wbsd_get_data(host);
if (!data)
goto end;
DBGF("Timeout\n");
data->error = MMC_ERR_TIMEOUT;
tasklet_schedule(&host->finish_tasklet);
end:
spin_unlock(&host->lock);
}
static void wbsd_tasklet_finish(unsigned long param)
{
struct wbsd_host *host = (struct wbsd_host *)param;
struct mmc_data *data;
spin_lock(&host->lock);
WARN_ON(!host->mrq);
if (!host->mrq)
goto end;
data = wbsd_get_data(host);
if (!data)
goto end;
wbsd_finish_data(host, data);
end:
spin_unlock(&host->lock);
}
/*
* Interrupt handling
*/
static irqreturn_t wbsd_irq(int irq, void *dev_id)
{
struct wbsd_host *host = dev_id;
int isr;
isr = inb(host->base + WBSD_ISR);
/*
* Was it actually our hardware that caused the interrupt?
*/
if (isr == 0xff || isr == 0x00)
return IRQ_NONE;
host->isr |= isr;
/*
* Schedule tasklets as needed.
*/
if (isr & WBSD_INT_CARD)
tasklet_schedule(&host->card_tasklet);
if (isr & WBSD_INT_FIFO_THRE)
tasklet_schedule(&host->fifo_tasklet);
if (isr & WBSD_INT_CRC)
tasklet_hi_schedule(&host->crc_tasklet);
if (isr & WBSD_INT_TIMEOUT)
tasklet_hi_schedule(&host->timeout_tasklet);
if (isr & WBSD_INT_TC)
tasklet_schedule(&host->finish_tasklet);
return IRQ_HANDLED;
}
/*****************************************************************************\
* *
* Device initialisation and shutdown *
* *
\*****************************************************************************/
/*
* Allocate/free MMC structure.
*/
static int __devinit wbsd_alloc_mmc(struct device *dev)
{
struct mmc_host *mmc;
struct wbsd_host *host;
/*
* Allocate MMC structure.
*/
mmc = mmc_alloc_host(sizeof(struct wbsd_host), dev);
if (!mmc)
return -ENOMEM;
host = mmc_priv(mmc);
host->mmc = mmc;
host->dma = -1;
/*
* Set host parameters.
*/
mmc->ops = &wbsd_ops;
mmc->f_min = 375000;
mmc->f_max = 24000000;
mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_MULTIWRITE | MMC_CAP_BYTEBLOCK;
spin_lock_init(&host->lock);
/*
* Set up timers
*/
init_timer(&host->ignore_timer);
host->ignore_timer.data = (unsigned long)host;
host->ignore_timer.function = wbsd_reset_ignore;
/*
* Maximum number of segments. Worst case is one sector per segment
* so this will be 64kB/512.
*/
mmc->max_hw_segs = 128;
mmc->max_phys_segs = 128;
/*
* Maximum request size. Also limited by 64KiB buffer.
*/
mmc->max_req_size = 65536;
/*
* Maximum segment size. Could be one segment with the maximum number
* of bytes.
*/
mmc->max_seg_size = mmc->max_req_size;
/*
* Maximum block size. We have 12 bits (= 4095) but have to subtract
* space for CRC. So the maximum is 4095 - 4*2 = 4087.
*/
mmc->max_blk_size = 4087;
/*
* Maximum block count. There is no real limit so the maximum
* request size will be the only restriction.
*/
mmc->max_blk_count = mmc->max_req_size;
dev_set_drvdata(dev, mmc);
return 0;
}
static void __devexit wbsd_free_mmc(struct device *dev)
{
struct mmc_host *mmc;
struct wbsd_host *host;
mmc = dev_get_drvdata(dev);
if (!mmc)
return;
host = mmc_priv(mmc);
BUG_ON(host == NULL);
del_timer_sync(&host->ignore_timer);
mmc_free_host(mmc);
dev_set_drvdata(dev, NULL);
}
/*
* Scan for known chip id:s
*/
static int __devinit wbsd_scan(struct wbsd_host *host)
{
int i, j, k;
int id;
/*
* Iterate through all ports, all codes to
* find hardware that is in our known list.
*/
for (i = 0; i < ARRAY_SIZE(config_ports); i++) {
if (!request_region(config_ports[i], 2, DRIVER_NAME))
continue;
for (j = 0; j < ARRAY_SIZE(unlock_codes); j++) {
id = 0xFFFF;
host->config = config_ports[i];
host->unlock_code = unlock_codes[j];
wbsd_unlock_config(host);
outb(WBSD_CONF_ID_HI, config_ports[i]);
id = inb(config_ports[i] + 1) << 8;
outb(WBSD_CONF_ID_LO, config_ports[i]);
id |= inb(config_ports[i] + 1);
wbsd_lock_config(host);
for (k = 0; k < ARRAY_SIZE(valid_ids); k++) {
if (id == valid_ids[k]) {
host->chip_id = id;
return 0;
}
}
if (id != 0xFFFF) {
DBG("Unknown hardware (id %x) found at %x\n",
id, config_ports[i]);
}
}
release_region(config_ports[i], 2);
}
host->config = 0;
host->unlock_code = 0;
return -ENODEV;
}
/*
* Allocate/free io port ranges
*/
static int __devinit wbsd_request_region(struct wbsd_host *host, int base)
{
if (base & 0x7)
return -EINVAL;
if (!request_region(base, 8, DRIVER_NAME))
return -EIO;
host->base = base;
return 0;
}
static void __devexit wbsd_release_regions(struct wbsd_host *host)
{
if (host->base)
release_region(host->base, 8);
host->base = 0;
if (host->config)
release_region(host->config, 2);
host->config = 0;
}
/*
* Allocate/free DMA port and buffer
*/
static void __devinit wbsd_request_dma(struct wbsd_host *host, int dma)
{
if (dma < 0)
return;
if (request_dma(dma, DRIVER_NAME))
goto err;
/*
* We need to allocate a special buffer in
* order for ISA to be able to DMA to it.
*/
host->dma_buffer = kmalloc(WBSD_DMA_SIZE,
GFP_NOIO | GFP_DMA | __GFP_REPEAT | __GFP_NOWARN);
if (!host->dma_buffer)
goto free;
/*
* Translate the address to a physical address.
*/
host->dma_addr = dma_map_single(mmc_dev(host->mmc), host->dma_buffer,
WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
/*
* ISA DMA must be aligned on a 64k basis.
*/
if ((host->dma_addr & 0xffff) != 0)
goto kfree;
/*
* ISA cannot access memory above 16 MB.
*/
else if (host->dma_addr >= 0x1000000)
goto kfree;
host->dma = dma;
return;
kfree:
/*
* If we've gotten here then there is some kind of alignment bug
*/
BUG_ON(1);
dma_unmap_single(mmc_dev(host->mmc), host->dma_addr,
WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
host->dma_addr = (dma_addr_t)NULL;
kfree(host->dma_buffer);
host->dma_buffer = NULL;
free:
free_dma(dma);
err:
printk(KERN_WARNING DRIVER_NAME ": Unable to allocate DMA %d. "
"Falling back on FIFO.\n", dma);
}
static void __devexit wbsd_release_dma(struct wbsd_host *host)
{
if (host->dma_addr) {
dma_unmap_single(mmc_dev(host->mmc), host->dma_addr,
WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
}
kfree(host->dma_buffer);
if (host->dma >= 0)
free_dma(host->dma);
host->dma = -1;
host->dma_buffer = NULL;
host->dma_addr = (dma_addr_t)NULL;
}
/*
* Allocate/free IRQ.
*/
static int __devinit wbsd_request_irq(struct wbsd_host *host, int irq)
{
int ret;
/*
* Allocate interrupt.
*/
ret = request_irq(irq, wbsd_irq, IRQF_SHARED, DRIVER_NAME, host);
if (ret)
return ret;
host->irq = irq;
/*
* Set up tasklets.
*/
tasklet_init(&host->card_tasklet, wbsd_tasklet_card,
(unsigned long)host);
tasklet_init(&host->fifo_tasklet, wbsd_tasklet_fifo,
(unsigned long)host);
tasklet_init(&host->crc_tasklet, wbsd_tasklet_crc,
(unsigned long)host);
tasklet_init(&host->timeout_tasklet, wbsd_tasklet_timeout,
(unsigned long)host);
tasklet_init(&host->finish_tasklet, wbsd_tasklet_finish,
(unsigned long)host);
return 0;
}
static void __devexit wbsd_release_irq(struct wbsd_host *host)
{
if (!host->irq)
return;
free_irq(host->irq, host);
host->irq = 0;
tasklet_kill(&host->card_tasklet);
tasklet_kill(&host->fifo_tasklet);
tasklet_kill(&host->crc_tasklet);
tasklet_kill(&host->timeout_tasklet);
tasklet_kill(&host->finish_tasklet);
}
/*
* Allocate all resources for the host.
*/
static int __devinit wbsd_request_resources(struct wbsd_host *host,
int base, int irq, int dma)
{
int ret;
/*
* Allocate I/O ports.
*/
ret = wbsd_request_region(host, base);
if (ret)
return ret;
/*
* Allocate interrupt.
*/
ret = wbsd_request_irq(host, irq);
if (ret)
return ret;
/*
* Allocate DMA.
*/
wbsd_request_dma(host, dma);
return 0;
}
/*
* Release all resources for the host.
*/
static void __devexit wbsd_release_resources(struct wbsd_host *host)
{
wbsd_release_dma(host);
wbsd_release_irq(host);
wbsd_release_regions(host);
}
/*
* Configure the resources the chip should use.
*/
static void wbsd_chip_config(struct wbsd_host *host)
{
wbsd_unlock_config(host);
/*
* Reset the chip.
*/
wbsd_write_config(host, WBSD_CONF_SWRST, 1);
wbsd_write_config(host, WBSD_CONF_SWRST, 0);
/*
* Select SD/MMC function.
*/
wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
/*
* Set up card detection.
*/
wbsd_write_config(host, WBSD_CONF_PINS, WBSD_PINS_DETECT_GP11);
/*
* Configure chip
*/
wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8);
wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff);
wbsd_write_config(host, WBSD_CONF_IRQ, host->irq);
if (host->dma >= 0)
wbsd_write_config(host, WBSD_CONF_DRQ, host->dma);
/*
* Enable and power up chip.
*/
wbsd_write_config(host, WBSD_CONF_ENABLE, 1);
wbsd_write_config(host, WBSD_CONF_POWER, 0x20);
wbsd_lock_config(host);
}
/*
* Check that configured resources are correct.
*/
static int wbsd_chip_validate(struct wbsd_host *host)
{
int base, irq, dma;
wbsd_unlock_config(host);
/*
* Select SD/MMC function.
*/
wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
/*
* Read configuration.
*/
base = wbsd_read_config(host, WBSD_CONF_PORT_HI) << 8;
base |= wbsd_read_config(host, WBSD_CONF_PORT_LO);
irq = wbsd_read_config(host, WBSD_CONF_IRQ);
dma = wbsd_read_config(host, WBSD_CONF_DRQ);
wbsd_lock_config(host);
/*
* Validate against given configuration.
*/
if (base != host->base)
return 0;
if (irq != host->irq)
return 0;
if ((dma != host->dma) && (host->dma != -1))
return 0;
return 1;
}
/*
* Powers down the SD function
*/
static void wbsd_chip_poweroff(struct wbsd_host *host)
{
wbsd_unlock_config(host);
wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
wbsd_write_config(host, WBSD_CONF_ENABLE, 0);
wbsd_lock_config(host);
}
/*****************************************************************************\
* *
* Devices setup and shutdown *
* *
\*****************************************************************************/
static int __devinit wbsd_init(struct device *dev, int base, int irq, int dma,
int pnp)
{
struct wbsd_host *host = NULL;
struct mmc_host *mmc = NULL;
int ret;
ret = wbsd_alloc_mmc(dev);
if (ret)
return ret;
mmc = dev_get_drvdata(dev);
host = mmc_priv(mmc);
/*
* Scan for hardware.
*/
ret = wbsd_scan(host);
if (ret) {
if (pnp && (ret == -ENODEV)) {
printk(KERN_WARNING DRIVER_NAME
": Unable to confirm device presence. You may "
"experience lock-ups.\n");
} else {
wbsd_free_mmc(dev);
return ret;
}
}
/*
* Request resources.
*/
ret = wbsd_request_resources(host, base, irq, dma);
if (ret) {
wbsd_release_resources(host);
wbsd_free_mmc(dev);
return ret;
}
/*
* See if chip needs to be configured.
*/
if (pnp) {
if ((host->config != 0) && !wbsd_chip_validate(host)) {
printk(KERN_WARNING DRIVER_NAME
": PnP active but chip not configured! "
"You probably have a buggy BIOS. "
"Configuring chip manually.\n");
wbsd_chip_config(host);
}
} else
wbsd_chip_config(host);
/*
* Power Management stuff. No idea how this works.
* Not tested.
*/
#ifdef CONFIG_PM
if (host->config) {
wbsd_unlock_config(host);
wbsd_write_config(host, WBSD_CONF_PME, 0xA0);
wbsd_lock_config(host);
}
#endif
/*
* Allow device to initialise itself properly.
*/
mdelay(5);
/*
* Reset the chip into a known state.
*/
wbsd_init_device(host);
mmc_add_host(mmc);
printk(KERN_INFO "%s: W83L51xD", mmc_hostname(mmc));
if (host->chip_id != 0)
printk(" id %x", (int)host->chip_id);
printk(" at 0x%x irq %d", (int)host->base, (int)host->irq);
if (host->dma >= 0)
printk(" dma %d", (int)host->dma);
else
printk(" FIFO");
if (pnp)
printk(" PnP");
printk("\n");
return 0;
}
static void __devexit wbsd_shutdown(struct device *dev, int pnp)
{
struct mmc_host *mmc = dev_get_drvdata(dev);
struct wbsd_host *host;
if (!mmc)
return;
host = mmc_priv(mmc);
mmc_remove_host(mmc);
/*
* Power down the SD/MMC function.
*/
if (!pnp)
wbsd_chip_poweroff(host);
wbsd_release_resources(host);
wbsd_free_mmc(dev);
}
/*
* Non-PnP
*/
static int __devinit wbsd_probe(struct platform_device *dev)
{
/* Use the module parameters for resources */
return wbsd_init(&dev->dev, io, irq, dma, 0);
}
static int __devexit wbsd_remove(struct platform_device *dev)
{
wbsd_shutdown(&dev->dev, 0);
return 0;
}
/*
* PnP
*/
#ifdef CONFIG_PNP
static int __devinit
wbsd_pnp_probe(struct pnp_dev *pnpdev, const struct pnp_device_id *dev_id)
{
int io, irq, dma;
/*
* Get resources from PnP layer.
*/
io = pnp_port_start(pnpdev, 0);
irq = pnp_irq(pnpdev, 0);
if (pnp_dma_valid(pnpdev, 0))
dma = pnp_dma(pnpdev, 0);
else
dma = -1;
DBGF("PnP resources: port %3x irq %d dma %d\n", io, irq, dma);
return wbsd_init(&pnpdev->dev, io, irq, dma, 1);
}
static void __devexit wbsd_pnp_remove(struct pnp_dev *dev)
{
wbsd_shutdown(&dev->dev, 1);
}
#endif /* CONFIG_PNP */
/*
* Power management
*/
#ifdef CONFIG_PM
static int wbsd_suspend(struct wbsd_host *host, pm_message_t state)
{
BUG_ON(host == NULL);
return mmc_suspend_host(host->mmc, state);
}
static int wbsd_resume(struct wbsd_host *host)
{
BUG_ON(host == NULL);
wbsd_init_device(host);
return mmc_resume_host(host->mmc);
}
static int wbsd_platform_suspend(struct platform_device *dev,
pm_message_t state)
{
struct mmc_host *mmc = platform_get_drvdata(dev);
struct wbsd_host *host;
int ret;
if (mmc == NULL)
return 0;
DBGF("Suspending...\n");
host = mmc_priv(mmc);
ret = wbsd_suspend(host, state);
if (ret)
return ret;
wbsd_chip_poweroff(host);
return 0;
}
static int wbsd_platform_resume(struct platform_device *dev)
{
struct mmc_host *mmc = platform_get_drvdata(dev);
struct wbsd_host *host;
if (mmc == NULL)
return 0;
DBGF("Resuming...\n");
host = mmc_priv(mmc);
wbsd_chip_config(host);
/*
* Allow device to initialise itself properly.
*/
mdelay(5);
return wbsd_resume(host);
}
#ifdef CONFIG_PNP
static int wbsd_pnp_suspend(struct pnp_dev *pnp_dev, pm_message_t state)
{
struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
struct wbsd_host *host;
if (mmc == NULL)
return 0;
DBGF("Suspending...\n");
host = mmc_priv(mmc);
return wbsd_suspend(host, state);
}
static int wbsd_pnp_resume(struct pnp_dev *pnp_dev)
{
struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
struct wbsd_host *host;
if (mmc == NULL)
return 0;
DBGF("Resuming...\n");
host = mmc_priv(mmc);
/*
* See if chip needs to be configured.
*/
if (host->config != 0) {
if (!wbsd_chip_validate(host)) {
printk(KERN_WARNING DRIVER_NAME
": PnP active but chip not configured! "
"You probably have a buggy BIOS. "
"Configuring chip manually.\n");
wbsd_chip_config(host);
}
}
/*
* Allow device to initialise itself properly.
*/
mdelay(5);
return wbsd_resume(host);
}
#endif /* CONFIG_PNP */
#else /* CONFIG_PM */
#define wbsd_platform_suspend NULL
#define wbsd_platform_resume NULL
#define wbsd_pnp_suspend NULL
#define wbsd_pnp_resume NULL
#endif /* CONFIG_PM */
static struct platform_device *wbsd_device;
static struct platform_driver wbsd_driver = {
.probe = wbsd_probe,
.remove = __devexit_p(wbsd_remove),
.suspend = wbsd_platform_suspend,
.resume = wbsd_platform_resume,
.driver = {
.name = DRIVER_NAME,
},
};
#ifdef CONFIG_PNP
static struct pnp_driver wbsd_pnp_driver = {
.name = DRIVER_NAME,
.id_table = pnp_dev_table,
.probe = wbsd_pnp_probe,
.remove = __devexit_p(wbsd_pnp_remove),
.suspend = wbsd_pnp_suspend,
.resume = wbsd_pnp_resume,
};
#endif /* CONFIG_PNP */
/*
* Module loading/unloading
*/
static int __init wbsd_drv_init(void)
{
int result;
printk(KERN_INFO DRIVER_NAME
": Winbond W83L51xD SD/MMC card interface driver\n");
printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
#ifdef CONFIG_PNP
if (!nopnp) {
result = pnp_register_driver(&wbsd_pnp_driver);
if (result < 0)
return result;
}
#endif /* CONFIG_PNP */
if (nopnp) {
result = platform_driver_register(&wbsd_driver);
if (result < 0)
return result;
wbsd_device = platform_device_alloc(DRIVER_NAME, -1);
if (!wbsd_device) {
platform_driver_unregister(&wbsd_driver);
return -ENOMEM;
}
result = platform_device_add(wbsd_device);
if (result) {
platform_device_put(wbsd_device);
platform_driver_unregister(&wbsd_driver);
return result;
}
}
return 0;
}
static void __exit wbsd_drv_exit(void)
{
#ifdef CONFIG_PNP
if (!nopnp)
pnp_unregister_driver(&wbsd_pnp_driver);
#endif /* CONFIG_PNP */
if (nopnp) {
platform_device_unregister(wbsd_device);
platform_driver_unregister(&wbsd_driver);
}
DBG("unloaded\n");
}
module_init(wbsd_drv_init);
module_exit(wbsd_drv_exit);
#ifdef CONFIG_PNP
module_param(nopnp, uint, 0444);
#endif
module_param(io, uint, 0444);
module_param(irq, uint, 0444);
module_param(dma, int, 0444);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Pierre Ossman <drzeus@drzeus.cx>");
MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver");
#ifdef CONFIG_PNP
MODULE_PARM_DESC(nopnp, "Scan for device instead of relying on PNP. (default 0)");
#endif
MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)");
MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)");
MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)");
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