/* Specifies how often in millisecs to poll for card status changes
* when the cover switch is open */
-#define OMAP_MMC_SWITCH_POLL_DELAY 500
+#define OMAP_MMC_COVER_POLL_DELAY 500
struct mmc_omap_host;
unsigned int fclk_freq;
unsigned powered:1;
- struct work_struct switch_work;
- struct timer_list switch_timer;
+ struct tasklet_struct cover_tasklet;
+ struct timer_list cover_timer;
unsigned cover_open;
struct mmc_request *mrq;
unsigned char bus_mode;
unsigned char hw_bus_mode;
+ struct work_struct cmd_abort_work;
+ unsigned abort:1;
+ struct timer_list cmd_abort_timer;
+
unsigned int sg_len;
int sg_idx;
u16 * buffer;
wait_queue_head_t slot_wq;
int nr_slots;
+ struct timer_list clk_timer;
+ spinlock_t clk_lock; /* for changing enabled state */
+ unsigned int fclk_enabled:1;
+
struct omap_mmc_platform_data *pdata;
};
+void mmc_omap_fclk_offdelay(struct mmc_omap_slot *slot)
+{
+ unsigned long tick_ns;
+
+ if (slot != NULL && slot->host->fclk_enabled && slot->fclk_freq > 0) {
+ tick_ns = (1000000000 + slot->fclk_freq - 1) / slot->fclk_freq;
+ ndelay(8 * tick_ns);
+ }
+}
+
+void mmc_omap_fclk_enable(struct mmc_omap_host *host, unsigned int enable)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&host->clk_lock, flags);
+ if (host->fclk_enabled != enable) {
+ host->fclk_enabled = enable;
+ if (enable)
+ clk_enable(host->fclk);
+ else
+ clk_disable(host->fclk);
+ }
+ spin_unlock_irqrestore(&host->clk_lock, flags);
+}
+
static void mmc_omap_select_slot(struct mmc_omap_slot *slot, int claimed)
{
struct mmc_omap_host *host = slot->host;
host->mmc = slot->mmc;
spin_unlock_irqrestore(&host->slot_lock, flags);
no_claim:
- clk_enable(host->fclk);
+ del_timer(&host->clk_timer);
+ if (host->current_slot != slot || !claimed)
+ mmc_omap_fclk_offdelay(host->current_slot);
+
if (host->current_slot != slot) {
+ OMAP_MMC_WRITE(host, CON, slot->saved_con & 0xFC00);
if (host->pdata->switch_slot != NULL)
host->pdata->switch_slot(mmc_dev(slot->mmc), slot->id);
host->current_slot = slot;
}
- /* Doing the dummy read here seems to work around some bug
- * at least in OMAP24xx silicon where the command would not
- * start after writing the CMD register. Sigh. */
- OMAP_MMC_READ(host, CON);
+ if (claimed) {
+ mmc_omap_fclk_enable(host, 1);
- OMAP_MMC_WRITE(host, CON, slot->saved_con);
+ /* Doing the dummy read here seems to work around some bug
+ * at least in OMAP24xx silicon where the command would not
+ * start after writing the CMD register. Sigh. */
+ OMAP_MMC_READ(host, CON);
+
+ OMAP_MMC_WRITE(host, CON, slot->saved_con);
+ } else
+ mmc_omap_fclk_enable(host, 0);
}
static void mmc_omap_start_request(struct mmc_omap_host *host,
struct mmc_request *req);
-static void mmc_omap_release_slot(struct mmc_omap_slot *slot)
+static void mmc_omap_release_slot(struct mmc_omap_slot *slot, int clk_enabled)
{
struct mmc_omap_host *host = slot->host;
unsigned long flags;
int i;
BUG_ON(slot == NULL || host->mmc == NULL);
- clk_disable(host->fclk);
+
+ if (clk_enabled)
+ /* Keeps clock running for at least 8 cycles on valid freq */
+ mod_timer(&host->clk_timer, jiffies + HZ/10);
+ else {
+ del_timer(&host->clk_timer);
+ mmc_omap_fclk_offdelay(slot);
+ mmc_omap_fclk_enable(host, 0);
+ }
spin_lock_irqsave(&host->slot_lock, flags);
/* Check for any pending requests */
static inline
int mmc_omap_cover_is_open(struct mmc_omap_slot *slot)
{
- return slot->pdata->get_cover_state(mmc_dev(slot->mmc), slot->id);
+ if (slot->pdata->get_cover_state)
+ return slot->pdata->get_cover_state(mmc_dev(slot->mmc),
+ slot->id);
+ return 0;
}
static ssize_t
if (host->data && !(host->data->flags & MMC_DATA_WRITE))
cmdreg |= 1 << 15;
+ mod_timer(&host->cmd_abort_timer, jiffies + HZ/2);
+
OMAP_MMC_WRITE(host, CTO, 200);
OMAP_MMC_WRITE(host, ARGL, cmd->arg & 0xffff);
OMAP_MMC_WRITE(host, ARGH, cmd->arg >> 16);
host->mrq = NULL;
mmc = host->mmc;
- mmc_omap_release_slot(host->current_slot);
+ mmc_omap_release_slot(host->current_slot, 1);
mmc_request_done(mmc, data->mrq);
return;
}
}
static void
-mmc_omap_abort_xfer(struct mmc_omap_host *host, struct mmc_data *data)
+mmc_omap_send_abort(struct mmc_omap_host *host, int maxloops)
{
- int loops;
- u16 ie;
+ struct mmc_omap_slot *slot = host->current_slot;
+ unsigned int restarts, passes, timeout;
+ u16 stat = 0;
+
+ /* Sending abort takes 80 clocks. Have some extra and round up */
+ timeout = (120*1000000 + slot->fclk_freq - 1)/slot->fclk_freq;
+ restarts = 0;
+ while (restarts < maxloops) {
+ OMAP_MMC_WRITE(host, STAT, 0xFFFF);
+ OMAP_MMC_WRITE(host, CMD, (3 << 12) | (1 << 7));
+
+ passes = 0;
+ while (passes < timeout) {
+ stat = OMAP_MMC_READ(host, STAT);
+ if (stat & OMAP_MMC_STAT_END_OF_CMD)
+ goto out;
+ udelay(1);
+ passes++;
+ }
+ restarts++;
+ }
+out:
+ OMAP_MMC_WRITE(host, STAT, stat);
+}
+
+static void
+mmc_omap_abort_xfer(struct mmc_omap_host *host, struct mmc_data *data)
+{
if (host->dma_in_use)
mmc_omap_release_dma(host, data, 1);
host->data = NULL;
host->sg_len = 0;
- ie = OMAP_MMC_READ(host, IE);
- OMAP_MMC_WRITE(host, IE, 0);
- OMAP_MMC_WRITE(host, CMD, 1 << 7);
- loops = 0;
- while (!(OMAP_MMC_READ(host, STAT) & OMAP_MMC_STAT_END_OF_CMD)) {
- udelay(1);
- loops++;
- if (loops == 100000)
- break;
- }
- OMAP_MMC_WRITE(host, STAT, OMAP_MMC_STAT_END_OF_CMD);
- OMAP_MMC_WRITE(host, IE, ie);
+ mmc_omap_send_abort(host, 10000);
}
static void
{
host->cmd = NULL;
+ del_timer(&host->cmd_abort_timer);
+
if (cmd->flags & MMC_RSP_PRESENT) {
if (cmd->flags & MMC_RSP_136) {
/* response type 2 */
mmc_omap_abort_xfer(host, host->data);
host->mrq = NULL;
mmc = host->mmc;
- mmc_omap_release_slot(host->current_slot);
+ mmc_omap_release_slot(host->current_slot, 1);
mmc_request_done(mmc, cmd->mrq);
}
}
+/*
+ * Abort stuck command. Can occur when card is removed while it is being
+ * read.
+ */
+static void mmc_omap_abort_command(struct work_struct *work)
+{
+ struct mmc_omap_host *host = container_of(work, struct mmc_omap_host,
+ cmd_abort_work);
+ BUG_ON(!host->cmd);
+
+ dev_dbg(mmc_dev(host->mmc), "Aborting stuck command CMD%d\n",
+ host->cmd->opcode);
+
+ if (host->cmd->error == 0)
+ host->cmd->error = -ETIMEDOUT;
+
+ if (host->data == NULL) {
+ struct mmc_command *cmd;
+ struct mmc_host *mmc;
+
+ cmd = host->cmd;
+ host->cmd = NULL;
+ mmc_omap_send_abort(host, 10000);
+
+ host->mrq = NULL;
+ mmc = host->mmc;
+ mmc_omap_release_slot(host->current_slot, 1);
+ mmc_request_done(mmc, cmd->mrq);
+ } else
+ mmc_omap_cmd_done(host, host->cmd);
+
+ host->abort = 0;
+ enable_irq(host->irq);
+}
+
+static void
+mmc_omap_cmd_timer(unsigned long data)
+{
+ struct mmc_omap_host *host = (struct mmc_omap_host *) data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&host->slot_lock, flags);
+ if (host->cmd != NULL && !host->abort) {
+ OMAP_MMC_WRITE(host, IE, 0);
+ disable_irq(host->irq);
+ host->abort = 1;
+ schedule_work(&host->cmd_abort_work);
+ }
+ spin_unlock_irqrestore(&host->slot_lock, flags);
+}
+
/* PIO only */
static void
mmc_omap_sg_to_buf(struct mmc_omap_host *host)
host->buffer_bytes_left = host->total_bytes_left;
}
+static void
+mmc_omap_clk_timer(unsigned long data)
+{
+ struct mmc_omap_host *host = (struct mmc_omap_host *) data;
+
+ mmc_omap_fclk_enable(host, 0);
+}
+
/* PIO only */
static void
mmc_omap_xfer_data(struct mmc_omap_host *host, int write)
}
}
+ if (cmd_error && host->data) {
+ del_timer(&host->cmd_abort_timer);
+ host->abort = 1;
+ OMAP_MMC_WRITE(host, IE, 0);
+ disable_irq(host->irq);
+ schedule_work(&host->cmd_abort_work);
+ return IRQ_HANDLED;
+ }
+
if (end_command)
mmc_omap_cmd_done(host, host->cmd);
if (host->data != NULL) {
return IRQ_HANDLED;
}
-void omap_mmc_notify_cover_event(struct device *dev, int slot, int is_closed)
+void omap_mmc_notify_cover_event(struct device *dev, int num, int is_closed)
{
+ int cover_open;
struct mmc_omap_host *host = dev_get_drvdata(dev);
+ struct mmc_omap_slot *slot = host->slots[num];
- BUG_ON(slot >= host->nr_slots);
+ BUG_ON(num >= host->nr_slots);
/* Other subsystems can call in here before we're initialised. */
- if (host->nr_slots == 0 || !host->slots[slot])
+ if (host->nr_slots == 0 || !host->slots[num])
return;
- schedule_work(&host->slots[slot]->switch_work);
+ cover_open = mmc_omap_cover_is_open(slot);
+ if (cover_open != slot->cover_open) {
+ slot->cover_open = cover_open;
+ sysfs_notify(&slot->mmc->class_dev.kobj, NULL, "cover_switch");
+ }
+
+ tasklet_hi_schedule(&slot->cover_tasklet);
}
-static void mmc_omap_switch_timer(unsigned long arg)
+static void mmc_omap_cover_timer(unsigned long arg)
{
struct mmc_omap_slot *slot = (struct mmc_omap_slot *) arg;
-
- schedule_work(&slot->switch_work);
+ tasklet_schedule(&slot->cover_tasklet);
}
-static void mmc_omap_cover_handler(struct work_struct *work)
+static void mmc_omap_cover_handler(unsigned long param)
{
- struct mmc_omap_slot *slot = container_of(work, struct mmc_omap_slot,
- switch_work);
- int cover_open;
+ struct mmc_omap_slot *slot = (struct mmc_omap_slot *)param;
+ int cover_open = mmc_omap_cover_is_open(slot);
- cover_open = mmc_omap_cover_is_open(slot);
- if (cover_open != slot->cover_open) {
- sysfs_notify(&slot->mmc->class_dev.kobj, NULL, "cover_switch");
- slot->cover_open = cover_open;
- dev_info(mmc_dev(slot->mmc), "cover is now %s\n",
- cover_open ? "open" : "closed");
- }
- mmc_detect_change(slot->mmc, slot->id);
+ mmc_detect_change(slot->mmc, 0);
+ if (!cover_open)
+ return;
+
+ /*
+ * If no card is inserted, we postpone polling until
+ * the cover has been closed.
+ */
+ if (slot->mmc->card == NULL || !mmc_card_present(slot->mmc->card))
+ return;
+
+ mod_timer(&slot->cover_timer,
+ jiffies + msecs_to_jiffies(OMAP_MMC_COVER_POLL_DELAY));
}
/* Prepare to transfer the next segment of a scatterlist */
struct mmc_omap_slot *slot = mmc_priv(mmc);
struct mmc_omap_host *host = slot->host;
int i, dsor;
-
- dsor = mmc_omap_calc_divisor(mmc, ios);
+ int clk_enabled;
mmc_omap_select_slot(slot, 0);
+ dsor = mmc_omap_calc_divisor(mmc, ios);
+
if (ios->vdd != slot->vdd)
slot->vdd = ios->vdd;
+ clk_enabled = 0;
switch (ios->power_mode) {
case MMC_POWER_OFF:
mmc_omap_set_power(slot, 0, ios->vdd);
mmc_omap_set_power(slot, 1, ios->vdd);
goto exit;
case MMC_POWER_ON:
+ mmc_omap_fclk_enable(host, 1);
+ clk_enabled = 1;
dsor |= 1 << 11;
break;
}
}
exit:
- mmc_omap_release_slot(slot);
+ mmc_omap_release_slot(slot, clk_enabled);
}
static const struct mmc_host_ops mmc_omap_ops = {
if (r < 0)
goto err_remove_slot_name;
- INIT_WORK(&slot->switch_work, mmc_omap_cover_handler);
- init_timer(&slot->switch_timer);
- slot->switch_timer.function = mmc_omap_switch_timer;
- slot->switch_timer.data = (unsigned long) slot;
- schedule_work(&slot->switch_work);
+ setup_timer(&slot->cover_timer, mmc_omap_cover_timer,
+ (unsigned long)slot);
+ tasklet_init(&slot->cover_tasklet, mmc_omap_cover_handler,
+ (unsigned long)slot);
+ tasklet_schedule(&slot->cover_tasklet);
}
return 0;
if (slot->pdata->get_cover_state != NULL)
device_remove_file(&mmc->class_dev, &dev_attr_cover_switch);
- del_timer_sync(&slot->switch_timer);
+ tasklet_kill(&slot->cover_tasklet);
+ del_timer_sync(&slot->cover_timer);
flush_scheduled_work();
mmc_remove_host(mmc);
goto err_free_mem_region;
}
+ INIT_WORK(&host->cmd_abort_work, mmc_omap_abort_command);
+ setup_timer(&host->cmd_abort_timer, mmc_omap_cmd_timer,
+ (unsigned long) host);
+
+ spin_lock_init(&host->clk_lock);
+ setup_timer(&host->clk_timer, mmc_omap_clk_timer, (unsigned long) host);
+
spin_lock_init(&host->dma_lock);
- init_timer(&host->dma_timer);
+ setup_timer(&host->dma_timer, mmc_omap_dma_timer, (unsigned long) host);
spin_lock_init(&host->slot_lock);
init_waitqueue_head(&host->slot_wq);
- host->dma_timer.function = mmc_omap_dma_timer;
- host->dma_timer.data = (unsigned long) host;
-
host->pdata = pdata;
host->dev = &pdev->dev;
platform_set_drvdata(pdev, host);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff