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bcm2835-sdhost.c
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bcm2835-sdhost.c
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/*
* BCM2835 SD host driver.
*
* Author: Phil Elwell <phil@raspberrypi.org>
* Copyright 2015
*
* Based on
* mmc-bcm2835.c by Gellert Weisz
* which is, in turn, based on
* sdhci-bcm2708.c by Broadcom
* sdhci-bcm2835.c by Stephen Warren and Oleksandr Tymoshenko
* sdhci.c and sdhci-pci.c by Pierre Ossman
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#define SAFE_READ_THRESHOLD 4
#define SAFE_WRITE_THRESHOLD 4
#define ALLOW_DMA 1
#define ALLOW_CMD23 0
#define ALLOW_FAST 1
#define USE_BLOCK_IRQ 1
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/host.h>
#include <linux/mmc/sd.h>
#include <linux/scatterlist.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/blkdev.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/of_dma.h>
#include <linux/time.h>
#define DRIVER_NAME "sdhost-bcm2835"
#define SDCMD 0x00 /* Command to SD card - 16 R/W */
#define SDARG 0x04 /* Argument to SD card - 32 R/W */
#define SDTOUT 0x08 /* Start value for timeout counter - 32 R/W */
#define SDCDIV 0x0c /* Start value for clock divider - 11 R/W */
#define SDRSP0 0x10 /* SD card response (31:0) - 32 R */
#define SDRSP1 0x14 /* SD card response (63:32) - 32 R */
#define SDRSP2 0x18 /* SD card response (95:64) - 32 R */
#define SDRSP3 0x1c /* SD card response (127:96) - 32 R */
#define SDHSTS 0x20 /* SD host status - 11 R */
#define SDVDD 0x30 /* SD card power control - 1 R/W */
#define SDEDM 0x34 /* Emergency Debug Mode - 13 R/W */
#define SDHCFG 0x38 /* Host configuration - 2 R/W */
#define SDHBCT 0x3c /* Host byte count (debug) - 32 R/W */
#define SDDATA 0x40 /* Data to/from SD card - 32 R/W */
#define SDHBLC 0x50 /* Host block count (SDIO/SDHC) - 9 R/W */
#define SDCMD_NEW_FLAG 0x8000
#define SDCMD_FAIL_FLAG 0x4000
#define SDCMD_BUSYWAIT 0x800
#define SDCMD_NO_RESPONSE 0x400
#define SDCMD_LONG_RESPONSE 0x200
#define SDCMD_WRITE_CMD 0x80
#define SDCMD_READ_CMD 0x40
#define SDCMD_CMD_MASK 0x3f
#define SDCDIV_MAX_CDIV 0x7ff
#define SDHSTS_BUSY_IRPT 0x400
#define SDHSTS_BLOCK_IRPT 0x200
#define SDHSTS_SDIO_IRPT 0x100
#define SDHSTS_REW_TIME_OUT 0x80
#define SDHSTS_CMD_TIME_OUT 0x40
#define SDHSTS_CRC16_ERROR 0x20
#define SDHSTS_CRC7_ERROR 0x10
#define SDHSTS_FIFO_ERROR 0x08
/* Reserved */
/* Reserved */
#define SDHSTS_DATA_FLAG 0x01
#define SDHSTS_TRANSFER_ERROR_MASK (SDHSTS_CRC7_ERROR|SDHSTS_CRC16_ERROR|SDHSTS_REW_TIME_OUT|SDHSTS_FIFO_ERROR)
#define SDHSTS_ERROR_MASK (SDHSTS_CMD_TIME_OUT|SDHSTS_TRANSFER_ERROR_MASK)
#define SDHCFG_BUSY_IRPT_EN (1<<10)
#define SDHCFG_BLOCK_IRPT_EN (1<<8)
#define SDHCFG_SDIO_IRPT_EN (1<<5)
#define SDHCFG_DATA_IRPT_EN (1<<4)
#define SDHCFG_SLOW_CARD (1<<3)
#define SDHCFG_WIDE_EXT_BUS (1<<2)
#define SDHCFG_WIDE_INT_BUS (1<<1)
#define SDHCFG_REL_CMD_LINE (1<<0)
#define SDEDM_FORCE_DATA_MODE (1<<19)
#define SDEDM_CLOCK_PULSE (1<<20)
#define SDEDM_BYPASS (1<<21)
#define SDEDM_WRITE_THRESHOLD_SHIFT 9
#define SDEDM_READ_THRESHOLD_SHIFT 14
#define SDEDM_THRESHOLD_MASK 0x1f
#define MHZ 1000000
#ifndef BCM2708_PERI_BASE
#define BCM2708_PERI_BASE 0x20000000
#endif
/* FIXME: Needs IOMMU support */
#define BCM2835_VCMMU_SHIFT (0x7E000000 - BCM2708_PERI_BASE)
struct bcm2835_host {
spinlock_t lock;
void __iomem *ioaddr;
u32 phys_addr;
struct mmc_host *mmc;
u32 pio_timeout; /* In jiffies */
int clock; /* Current clock speed */
bool slow_card; /* Force 11-bit divisor */
unsigned int max_clk; /* Max possible freq */
struct tasklet_struct finish_tasklet; /* Tasklet structures */
struct timer_list timer; /* Timer for timeouts */
struct timer_list pio_timer; /* PIO error detection timer */
struct sg_mapping_iter sg_miter; /* SG state for PIO */
unsigned int blocks; /* remaining PIO blocks */
int irq; /* Device IRQ */
/* cached registers */
u32 hcfg;
u32 cdiv;
struct mmc_request *mrq; /* Current request */
struct mmc_command *cmd; /* Current command */
struct mmc_data *data; /* Current data request */
unsigned int data_complete:1; /* Data finished before cmd */
unsigned int flush_fifo:1; /* Drain the fifo when finishing */
unsigned int use_busy:1; /* Wait for busy interrupt */
unsigned int debug:1; /* Enable debug output */
u32 thread_isr;
/*DMA part*/
struct dma_chan *dma_chan_rx; /* DMA channel for reads */
struct dma_chan *dma_chan_tx; /* DMA channel for writes */
bool allow_dma;
bool have_dma;
bool use_dma;
/*end of DMA part*/
int max_delay; /* maximum length of time spent waiting */
struct timeval stop_time; /* when the last stop was issued */
u32 delay_after_stop; /* minimum time between stop and subsequent data transfer */
u32 overclock_50; /* frequency to use when 50MHz is requested (in MHz) */
u32 overclock; /* Current frequency if overclocked, else zero */
u32 pio_limit; /* Maximum block count for PIO (0 = always DMA) */
};
static inline void bcm2835_sdhost_write(struct bcm2835_host *host, u32 val, int reg)
{
writel(val, host->ioaddr + reg);
}
static inline u32 bcm2835_sdhost_read(struct bcm2835_host *host, int reg)
{
return readl(host->ioaddr + reg);
}
static inline u32 bcm2835_sdhost_read_relaxed(struct bcm2835_host *host, int reg)
{
return readl_relaxed(host->ioaddr + reg);
}
static void bcm2835_sdhost_dumpcmd(struct bcm2835_host *host,
struct mmc_command *cmd,
const char *label)
{
if (cmd)
pr_info("%s:%c%s op %d arg 0x%x flags 0x%x - resp %08x %08x %08x %08x, err %d\n",
mmc_hostname(host->mmc),
(cmd == host->cmd) ? '>' : ' ',
label, cmd->opcode, cmd->arg, cmd->flags,
cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3],
cmd->error);
}
static void bcm2835_sdhost_dumpregs(struct bcm2835_host *host)
{
bcm2835_sdhost_dumpcmd(host, host->mrq->sbc, "sbc");
bcm2835_sdhost_dumpcmd(host, host->mrq->cmd, "cmd");
if (host->mrq->data)
pr_err("%s: data blocks %x blksz %x - err %d\n",
mmc_hostname(host->mmc),
host->mrq->data->blocks,
host->mrq->data->blksz,
host->mrq->data->error);
bcm2835_sdhost_dumpcmd(host, host->mrq->stop, "stop");
pr_info("%s: =========== REGISTER DUMP ===========\n",
mmc_hostname(host->mmc));
pr_info("%s: SDCMD 0x%08x\n",
mmc_hostname(host->mmc),
bcm2835_sdhost_read(host, SDCMD));
pr_info("%s: SDARG 0x%08x\n",
mmc_hostname(host->mmc),
bcm2835_sdhost_read(host, SDARG));
pr_info("%s: SDTOUT 0x%08x\n",
mmc_hostname(host->mmc),
bcm2835_sdhost_read(host, SDTOUT));
pr_info("%s: SDCDIV 0x%08x\n",
mmc_hostname(host->mmc),
bcm2835_sdhost_read(host, SDCDIV));
pr_info("%s: SDRSP0 0x%08x\n",
mmc_hostname(host->mmc),
bcm2835_sdhost_read(host, SDRSP0));
pr_info("%s: SDRSP1 0x%08x\n",
mmc_hostname(host->mmc),
bcm2835_sdhost_read(host, SDRSP1));
pr_info("%s: SDRSP2 0x%08x\n",
mmc_hostname(host->mmc),
bcm2835_sdhost_read(host, SDRSP2));
pr_info("%s: SDRSP3 0x%08x\n",
mmc_hostname(host->mmc),
bcm2835_sdhost_read(host, SDRSP3));
pr_info("%s: SDHSTS 0x%08x\n",
mmc_hostname(host->mmc),
bcm2835_sdhost_read(host, SDHSTS));
pr_info("%s: SDVDD 0x%08x\n",
mmc_hostname(host->mmc),
bcm2835_sdhost_read(host, SDVDD));
pr_info("%s: SDEDM 0x%08x\n",
mmc_hostname(host->mmc),
bcm2835_sdhost_read(host, SDEDM));
pr_info("%s: SDHCFG 0x%08x\n",
mmc_hostname(host->mmc),
bcm2835_sdhost_read(host, SDHCFG));
pr_info("%s: SDHBCT 0x%08x\n",
mmc_hostname(host->mmc),
bcm2835_sdhost_read(host, SDHBCT));
pr_info("%s: SDHBLC 0x%08x\n",
mmc_hostname(host->mmc),
bcm2835_sdhost_read(host, SDHBLC));
pr_info("%s: ===========================================\n",
mmc_hostname(host->mmc));
}
static void bcm2835_sdhost_set_power(struct bcm2835_host *host, bool on)
{
bcm2835_sdhost_write(host, on ? 1 : 0, SDVDD);
}
static void bcm2835_sdhost_reset_internal(struct bcm2835_host *host)
{
u32 temp;
bcm2835_sdhost_set_power(host, false);
bcm2835_sdhost_write(host, 0, SDCMD);
bcm2835_sdhost_write(host, 0, SDARG);
bcm2835_sdhost_write(host, 0xf00000, SDTOUT);
bcm2835_sdhost_write(host, 0, SDCDIV);
bcm2835_sdhost_write(host, 0x7f8, SDHSTS); /* Write 1s to clear */
bcm2835_sdhost_write(host, 0, SDHCFG);
bcm2835_sdhost_write(host, 0, SDHBCT);
bcm2835_sdhost_write(host, 0, SDHBLC);
/* Limit fifo usage due to silicon bug */
temp = bcm2835_sdhost_read(host, SDEDM);
temp &= ~((SDEDM_THRESHOLD_MASK<<SDEDM_READ_THRESHOLD_SHIFT) |
(SDEDM_THRESHOLD_MASK<<SDEDM_WRITE_THRESHOLD_SHIFT));
temp |= (SAFE_READ_THRESHOLD << SDEDM_READ_THRESHOLD_SHIFT) |
(SAFE_WRITE_THRESHOLD << SDEDM_WRITE_THRESHOLD_SHIFT);
bcm2835_sdhost_write(host, temp, SDEDM);
mdelay(10);
bcm2835_sdhost_set_power(host, true);
mdelay(10);
host->clock = 0;
bcm2835_sdhost_write(host, host->hcfg, SDHCFG);
bcm2835_sdhost_write(host, host->cdiv, SDCDIV);
mmiowb();
}
static void bcm2835_sdhost_reset(struct mmc_host *mmc)
{
struct bcm2835_host *host = mmc_priv(mmc);
unsigned long flags;
if (host->debug)
pr_info("%s: reset\n", mmc_hostname(mmc));
spin_lock_irqsave(&host->lock, flags);
bcm2835_sdhost_reset_internal(host);
spin_unlock_irqrestore(&host->lock, flags);
}
static void bcm2835_sdhost_set_ios(struct mmc_host *mmc, struct mmc_ios *ios);
static void bcm2835_sdhost_init(struct bcm2835_host *host, int soft)
{
pr_debug("bcm2835_sdhost_init(%d)\n", soft);
/* Set interrupt enables */
host->hcfg = SDHCFG_BUSY_IRPT_EN;
bcm2835_sdhost_reset_internal(host);
if (soft) {
/* force clock reconfiguration */
host->clock = 0;
bcm2835_sdhost_set_ios(host->mmc, &host->mmc->ios);
}
}
static bool bcm2835_sdhost_is_write_complete(struct bcm2835_host *host)
{
bool write_complete = ((bcm2835_sdhost_read(host, SDEDM) & 0xf) == 1);
if (!write_complete) {
/* Request an IRQ for the last block */
host->hcfg |= SDHCFG_BLOCK_IRPT_EN;
bcm2835_sdhost_write(host, host->hcfg, SDHCFG);
if ((bcm2835_sdhost_read(host, SDEDM) & 0xf) == 1) {
/* The write has now completed. Disable the interrupt
and clear the status flag */
host->hcfg &= ~SDHCFG_BLOCK_IRPT_EN;
bcm2835_sdhost_write(host, host->hcfg, SDHCFG);
bcm2835_sdhost_write(host, SDHSTS_BLOCK_IRPT, SDHSTS);
write_complete = true;
}
}
return write_complete;
}
static void bcm2835_sdhost_wait_write_complete(struct bcm2835_host *host)
{
int timediff;
#ifdef DEBUG
static struct timeval start_time;
static int max_stall_time = 0;
static int total_stall_time = 0;
struct timeval before, after;
do_gettimeofday(&before);
if (max_stall_time == 0)
start_time = before;
#endif
timediff = 0;
while (1) {
u32 edm = bcm2835_sdhost_read(host, SDEDM);
if ((edm & 0xf) == 1)
break;
timediff++;
if (timediff > 5000000) {
#ifdef DEBUG
do_gettimeofday(&after);
timediff = (after.tv_sec - before.tv_sec)*1000000 +
(after.tv_usec - before.tv_usec);
pr_err(" wait_write_complete - still waiting after %dus\n",
timediff);
#else
pr_err(" wait_write_complete - still waiting after %d retries\n",
timediff);
#endif
bcm2835_sdhost_dumpregs(host);
host->data->error = -ETIMEDOUT;
return;
}
}
#ifdef DEBUG
do_gettimeofday(&after);
timediff = (after.tv_sec - before.tv_sec)*1000000 + (after.tv_usec - before.tv_usec);
total_stall_time += timediff;
if (timediff > max_stall_time)
max_stall_time = timediff;
if ((after.tv_sec - start_time.tv_sec) > 10) {
pr_debug(" wait_write_complete - max wait %dus, total %dus\n",
max_stall_time, total_stall_time);
start_time = after;
max_stall_time = 0;
total_stall_time = 0;
}
#endif
}
static void bcm2835_sdhost_finish_data(struct bcm2835_host *host);
static void bcm2835_sdhost_dma_complete(void *param)
{
struct bcm2835_host *host = param;
struct dma_chan *dma_chan;
unsigned long flags;
u32 dir_data;
spin_lock_irqsave(&host->lock, flags);
if (host->data) {
bool write_complete;
if (USE_BLOCK_IRQ)
write_complete = bcm2835_sdhost_is_write_complete(host);
else {
bcm2835_sdhost_wait_write_complete(host);
write_complete = true;
}
pr_debug("dma_complete() - write_complete=%d\n",
write_complete);
if (write_complete || (host->data->flags & MMC_DATA_READ))
{
if (write_complete) {
dma_chan = host->dma_chan_tx;
dir_data = DMA_TO_DEVICE;
} else {
dma_chan = host->dma_chan_rx;
dir_data = DMA_FROM_DEVICE;
}
dma_unmap_sg(dma_chan->device->dev,
host->data->sg, host->data->sg_len,
dir_data);
bcm2835_sdhost_finish_data(host);
}
}
spin_unlock_irqrestore(&host->lock, flags);
}
static bool data_transfer_wait(struct bcm2835_host *host)
{
unsigned long timeout = 1000000;
while (timeout)
{
u32 sdhsts = bcm2835_sdhost_read(host, SDHSTS);
if (sdhsts & SDHSTS_DATA_FLAG) {
bcm2835_sdhost_write(host, SDHSTS_DATA_FLAG, SDHSTS);
break;
}
timeout--;
}
if (timeout == 0) {
pr_err("%s: Data %s timeout\n",
mmc_hostname(host->mmc),
(host->data->flags & MMC_DATA_READ) ? "read" : "write");
bcm2835_sdhost_dumpregs(host);
host->data->error = -ETIMEDOUT;
return false;
}
return true;
}
static void bcm2835_sdhost_read_block_pio(struct bcm2835_host *host)
{
unsigned long flags;
size_t blksize, len;
u32 *buf;
blksize = host->data->blksz;
local_irq_save(flags);
while (blksize) {
if (!sg_miter_next(&host->sg_miter))
BUG();
len = min(host->sg_miter.length, blksize);
BUG_ON(len % 4);
blksize -= len;
host->sg_miter.consumed = len;
buf = (u32 *)host->sg_miter.addr;
while (len) {
if (!data_transfer_wait(host))
break;
*(buf++) = bcm2835_sdhost_read(host, SDDATA);
len -= 4;
}
if (host->data->error)
break;
}
sg_miter_stop(&host->sg_miter);
local_irq_restore(flags);
}
static void bcm2835_sdhost_write_block_pio(struct bcm2835_host *host)
{
unsigned long flags;
size_t blksize, len;
u32 *buf;
blksize = host->data->blksz;
local_irq_save(flags);
while (blksize) {
if (!sg_miter_next(&host->sg_miter))
BUG();
len = min(host->sg_miter.length, blksize);
BUG_ON(len % 4);
blksize -= len;
host->sg_miter.consumed = len;
buf = host->sg_miter.addr;
while (len) {
if (!data_transfer_wait(host))
break;
bcm2835_sdhost_write(host, *(buf++), SDDATA);
len -= 4;
}
if (host->data->error)
break;
}
sg_miter_stop(&host->sg_miter);
local_irq_restore(flags);
}
static void bcm2835_sdhost_transfer_pio(struct bcm2835_host *host)
{
u32 sdhsts;
bool is_read;
BUG_ON(!host->data);
is_read = (host->data->flags & MMC_DATA_READ) != 0;
if (is_read)
bcm2835_sdhost_read_block_pio(host);
else
bcm2835_sdhost_write_block_pio(host);
sdhsts = bcm2835_sdhost_read(host, SDHSTS);
if (sdhsts & (SDHSTS_CRC16_ERROR |
SDHSTS_CRC7_ERROR |
SDHSTS_FIFO_ERROR)) {
pr_err("%s: %s transfer error - HSTS %x\n",
mmc_hostname(host->mmc),
is_read ? "read" : "write",
sdhsts);
host->data->error = -EILSEQ;
} else if ((sdhsts & (SDHSTS_CMD_TIME_OUT |
SDHSTS_REW_TIME_OUT))) {
pr_err("%s: %s timeout error - HSTS %x\n",
mmc_hostname(host->mmc),
is_read ? "read" : "write",
sdhsts);
host->data->error = -ETIMEDOUT;
} else if (!is_read && !host->data->error) {
/* Start a timer in case a transfer error occurs because
there is no error interrupt */
mod_timer(&host->pio_timer, jiffies + host->pio_timeout);
}
}
static void bcm2835_sdhost_transfer_dma(struct bcm2835_host *host)
{
u32 len, dir_data, dir_slave;
struct dma_async_tx_descriptor *desc = NULL;
struct dma_chan *dma_chan;
pr_debug("bcm2835_sdhost_transfer_dma()\n");
WARN_ON(!host->data);
if (!host->data)
return;
if (host->data->flags & MMC_DATA_READ) {
dma_chan = host->dma_chan_rx;
dir_data = DMA_FROM_DEVICE;
dir_slave = DMA_DEV_TO_MEM;
} else {
dma_chan = host->dma_chan_tx;
dir_data = DMA_TO_DEVICE;
dir_slave = DMA_MEM_TO_DEV;
}
BUG_ON(!dma_chan->device);
BUG_ON(!dma_chan->device->dev);
BUG_ON(!host->data->sg);
len = dma_map_sg(dma_chan->device->dev, host->data->sg,
host->data->sg_len, dir_data);
if (len > 0) {
desc = dmaengine_prep_slave_sg(dma_chan, host->data->sg,
len, dir_slave,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
} else {
dev_err(mmc_dev(host->mmc), "dma_map_sg returned zero length\n");
}
if (desc) {
desc->callback = bcm2835_sdhost_dma_complete;
desc->callback_param = host;
dmaengine_submit(desc);
dma_async_issue_pending(dma_chan);
}
}
static void bcm2835_sdhost_set_transfer_irqs(struct bcm2835_host *host)
{
u32 all_irqs = SDHCFG_DATA_IRPT_EN | SDHCFG_BLOCK_IRPT_EN |
SDHCFG_BUSY_IRPT_EN;
if (host->use_dma)
host->hcfg = (host->hcfg & ~all_irqs) |
SDHCFG_BUSY_IRPT_EN;
else
host->hcfg = (host->hcfg & ~all_irqs) |
SDHCFG_DATA_IRPT_EN |
SDHCFG_BUSY_IRPT_EN;
bcm2835_sdhost_write(host, host->hcfg, SDHCFG);
}
static void bcm2835_sdhost_prepare_data(struct bcm2835_host *host, struct mmc_command *cmd)
{
struct mmc_data *data = cmd->data;
WARN_ON(host->data);
if (!data)
return;
/* Sanity checks */
BUG_ON(data->blksz * data->blocks > 524288);
BUG_ON(data->blksz > host->mmc->max_blk_size);
BUG_ON(data->blocks > 65535);
host->data = data;
host->data_complete = 0;
host->flush_fifo = 0;
host->data->bytes_xfered = 0;
host->use_dma = host->have_dma && (data->blocks > host->pio_limit);
if (!host->use_dma) {
int flags;
flags = SG_MITER_ATOMIC;
if (data->flags & MMC_DATA_READ)
flags |= SG_MITER_TO_SG;
else
flags |= SG_MITER_FROM_SG;
sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
host->blocks = data->blocks;
}
bcm2835_sdhost_set_transfer_irqs(host);
bcm2835_sdhost_write(host, data->blksz, SDHBCT);
bcm2835_sdhost_write(host, host->use_dma ? data->blocks : 0, SDHBLC);
BUG_ON(!host->data);
}
void bcm2835_sdhost_send_command(struct bcm2835_host *host, struct mmc_command *cmd)
{
u32 sdcmd, sdhsts;
unsigned long timeout;
int delay;
WARN_ON(host->cmd);
if (cmd->data)
pr_debug("%s: send_command %d 0x%x "
"(flags 0x%x) - %s %d*%d\n",
mmc_hostname(host->mmc),
cmd->opcode, cmd->arg, cmd->flags,
(cmd->data->flags & MMC_DATA_READ) ?
"read" : "write", cmd->data->blocks,
cmd->data->blksz);
else
pr_debug("%s: send_command %d 0x%x (flags 0x%x)\n",
mmc_hostname(host->mmc),
cmd->opcode, cmd->arg, cmd->flags);
/* Wait max 100 ms */
timeout = 10000;
while (bcm2835_sdhost_read(host, SDCMD) & SDCMD_NEW_FLAG) {
if (timeout == 0) {
pr_err("%s: previous command never completed.\n",
mmc_hostname(host->mmc));
bcm2835_sdhost_dumpregs(host);
cmd->error = -EIO;
tasklet_schedule(&host->finish_tasklet);
return;
}
timeout--;
udelay(10);
}
delay = (10000 - timeout)/100;
if (delay > host->max_delay) {
host->max_delay = delay;
pr_warning("%s: controller hung for %d ms\n",
mmc_hostname(host->mmc),
host->max_delay);
}
timeout = jiffies;
if (!cmd->data && cmd->busy_timeout > 9000)
timeout += DIV_ROUND_UP(cmd->busy_timeout, 1000) * HZ + HZ;
else
timeout += 10 * HZ;
mod_timer(&host->timer, timeout);
host->cmd = cmd;
/* Clear any error flags */
sdhsts = bcm2835_sdhost_read(host, SDHSTS);
if (sdhsts & SDHSTS_ERROR_MASK)
bcm2835_sdhost_write(host, sdhsts, SDHSTS);
bcm2835_sdhost_prepare_data(host, cmd);
bcm2835_sdhost_write(host, cmd->arg, SDARG);
if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
pr_err("%s: unsupported response type!\n",
mmc_hostname(host->mmc));
cmd->error = -EINVAL;
tasklet_schedule(&host->finish_tasklet);
return;
}
sdcmd = cmd->opcode & SDCMD_CMD_MASK;
if (!(cmd->flags & MMC_RSP_PRESENT))
sdcmd |= SDCMD_NO_RESPONSE;
else {
if (cmd->flags & MMC_RSP_136)
sdcmd |= SDCMD_LONG_RESPONSE;
if (cmd->flags & MMC_RSP_BUSY) {
sdcmd |= SDCMD_BUSYWAIT;
host->use_busy = 1;
}
}
if (cmd->data) {
if (host->delay_after_stop) {
struct timeval now;
int time_since_stop;
do_gettimeofday(&now);
time_since_stop = (now.tv_sec - host->stop_time.tv_sec);
if (time_since_stop < 2) {
/* Possibly less than one second */
time_since_stop = time_since_stop * 1000000 +
(now.tv_usec - host->stop_time.tv_usec);
if (time_since_stop < host->delay_after_stop)
udelay(host->delay_after_stop -
time_since_stop);
}
}
if (cmd->data->flags & MMC_DATA_WRITE)
sdcmd |= SDCMD_WRITE_CMD;
if (cmd->data->flags & MMC_DATA_READ)
sdcmd |= SDCMD_READ_CMD;
}
bcm2835_sdhost_write(host, sdcmd | SDCMD_NEW_FLAG, SDCMD);
}
static void bcm2835_sdhost_finish_command(struct bcm2835_host *host);
static void bcm2835_sdhost_transfer_complete(struct bcm2835_host *host);
static void bcm2835_sdhost_finish_data(struct bcm2835_host *host)
{
struct mmc_data *data;
data = host->data;
BUG_ON(!data);
pr_debug("finish_data(error %d, stop %d, sbc %d)\n",
data->error, data->stop ? 1 : 0,
host->mrq->sbc ? 1 : 0);
host->hcfg &= ~(SDHCFG_DATA_IRPT_EN | SDHCFG_BLOCK_IRPT_EN);
bcm2835_sdhost_write(host, host->hcfg, SDHCFG);
if (data->error) {
data->bytes_xfered = 0;
} else
data->bytes_xfered = data->blksz * data->blocks;
host->data_complete = 1;
if (host->cmd) {
/*
* Data managed to finish before the
* command completed. Make sure we do
* things in the proper order.
*/
pr_debug("Finished early - HSTS %x\n",
bcm2835_sdhost_read(host, SDHSTS));
}
else
bcm2835_sdhost_transfer_complete(host);
}
static void bcm2835_sdhost_transfer_complete(struct bcm2835_host *host)
{
struct mmc_data *data;
BUG_ON(host->cmd);
BUG_ON(!host->data);
BUG_ON(!host->data_complete);
data = host->data;
host->data = NULL;
pr_debug("transfer_complete(error %d, stop %d)\n",
data->error, data->stop ? 1 : 0);
/*
* Need to send CMD12 if -
* a) open-ended multiblock transfer (no CMD23)
* b) error in multiblock transfer
*/
if (data->stop &&
(data->error ||
!host->mrq->sbc)) {
host->flush_fifo = 1;
bcm2835_sdhost_send_command(host, data->stop);
if (host->delay_after_stop)
do_gettimeofday(&host->stop_time);
if (!host->use_busy)
bcm2835_sdhost_finish_command(host);
} else {
tasklet_schedule(&host->finish_tasklet);
}
}
static void bcm2835_sdhost_finish_command(struct bcm2835_host *host)
{
u32 sdcmd;
unsigned long timeout;
#ifdef DEBUG
struct timeval before, after;
int timediff = 0;
#endif
pr_debug("finish_command(%x)\n", bcm2835_sdhost_read(host, SDCMD));
BUG_ON(!host->cmd || !host->mrq);
#ifdef DEBUG
do_gettimeofday(&before);
#endif
/* Wait max 100 ms */
timeout = 10000;
for (sdcmd = bcm2835_sdhost_read(host, SDCMD);
(sdcmd & SDCMD_NEW_FLAG) && timeout;
timeout--) {
if (host->flush_fifo) {
while (bcm2835_sdhost_read(host, SDHSTS) &
SDHSTS_DATA_FLAG)
(void)bcm2835_sdhost_read(host, SDDATA);
}
udelay(10);
sdcmd = bcm2835_sdhost_read(host, SDCMD);
}
#ifdef DEBUG
do_gettimeofday(&after);
timediff = (after.tv_sec - before.tv_sec)*1000000 +
(after.tv_usec - before.tv_usec);
pr_debug(" finish_command - waited %dus\n", timediff);
#endif
if (timeout == 0) {
pr_err("%s: command never completed.\n",
mmc_hostname(host->mmc));
bcm2835_sdhost_dumpregs(host);
host->cmd->error = -EIO;
tasklet_schedule(&host->finish_tasklet);
return;
}
if (host->flush_fifo) {
for (timeout = 100;
(bcm2835_sdhost_read(host, SDHSTS) & SDHSTS_DATA_FLAG) && timeout;
timeout--) {
(void)bcm2835_sdhost_read(host, SDDATA);
}
host->flush_fifo = 0;
if (timeout == 0) {
pr_err("%s: FIFO never drained.\n",
mmc_hostname(host->mmc));
bcm2835_sdhost_dumpregs(host);
host->cmd->error = -EIO;
tasklet_schedule(&host->finish_tasklet);
return;
}
}
/* Check for errors */
if (sdcmd & SDCMD_FAIL_FLAG)
{
u32 sdhsts = bcm2835_sdhost_read(host, SDHSTS);
if (host->debug)
pr_info("%s: error detected - CMD %x, HSTS %03x, EDM %x\n",
mmc_hostname(host->mmc), sdcmd, sdhsts,
bcm2835_sdhost_read(host, SDEDM));
if ((sdhsts & SDHSTS_CRC7_ERROR) &&
(host->cmd->opcode == 1)) {
if (host->debug)
pr_info("%s: ignoring CRC7 error for CMD1\n",
mmc_hostname(host->mmc));
} else {
if (sdhsts & SDHSTS_CMD_TIME_OUT) {
switch (host->cmd->opcode) {
case 5: case 52: case 53:
/* Don't warn about SDIO commands */
break;
default:
pr_err("%s: command timeout\n",
mmc_hostname(host->mmc));
break;
}
host->cmd->error = -ETIMEDOUT;
} else {
pr_err("%s: unexpected command error\n",
mmc_hostname(host->mmc));
bcm2835_sdhost_dumpregs(host);
host->cmd->error = -EIO;
}
tasklet_schedule(&host->finish_tasklet);
return;
}
}
if (host->cmd->flags & MMC_RSP_PRESENT) {
if (host->cmd->flags & MMC_RSP_136) {
int i;
for (i = 0; i < 4; i++)
host->cmd->resp[3 - i] = bcm2835_sdhost_read(host, SDRSP0 + i*4);
pr_debug("%s: finish_command %08x %08x %08x %08x\n",
mmc_hostname(host->mmc),
host->cmd->resp[0], host->cmd->resp[1], host->cmd->resp[2], host->cmd->resp[3]);
} else {
host->cmd->resp[0] = bcm2835_sdhost_read(host, SDRSP0);
pr_debug("%s: finish_command %08x\n",