#define SDHCI_USE_LEDS_CLASS
#endif
+#define MAX_TUNING_LOOP 40
+
static unsigned int debug_quirks = 0;
static void sdhci_finish_data(struct sdhci_host *);
flags |= SDHCI_CMD_CRC;
if (cmd->flags & MMC_RSP_OPCODE)
flags |= SDHCI_CMD_INDEX;
- if (cmd->data)
+
+ /* CMD19 is special in that the Data Present Select should be set */
+ if (cmd->data || (cmd->opcode == MMC_SEND_TUNING_BLOCK))
flags |= SDHCI_CMD_DATA;
sdhci_writew(host, SDHCI_MAKE_CMD(cmd->opcode, flags), SDHCI_COMMAND);
return 0;
}
+static int sdhci_execute_tuning(struct mmc_host *mmc)
+{
+ struct sdhci_host *host;
+ u16 ctrl;
+ u32 ier;
+ int tuning_loop_counter = MAX_TUNING_LOOP;
+ unsigned long timeout;
+ int err = 0;
+
+ host = mmc_priv(mmc);
+
+ disable_irq(host->irq);
+ spin_lock(&host->lock);
+
+ ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+
+ /*
+ * Host Controller needs tuning only in case of SDR104 mode
+ * and for SDR50 mode when Use Tuning for SDR50 is set in
+ * Capabilities register.
+ */
+ if (((ctrl & SDHCI_CTRL_UHS_MASK) == SDHCI_CTRL_UHS_SDR104) ||
+ (((ctrl & SDHCI_CTRL_UHS_MASK) == SDHCI_CTRL_UHS_SDR50) &&
+ (host->flags & SDHCI_SDR50_NEEDS_TUNING)))
+ ctrl |= SDHCI_CTRL_EXEC_TUNING;
+ else {
+ spin_unlock(&host->lock);
+ enable_irq(host->irq);
+ return 0;
+ }
+
+ sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
+
+ /*
+ * As per the Host Controller spec v3.00, tuning command
+ * generates Buffer Read Ready interrupt, so enable that.
+ *
+ * Note: The spec clearly says that when tuning sequence
+ * is being performed, the controller does not generate
+ * interrupts other than Buffer Read Ready interrupt. But
+ * to make sure we don't hit a controller bug, we _only_
+ * enable Buffer Read Ready interrupt here.
+ */
+ ier = sdhci_readl(host, SDHCI_INT_ENABLE);
+ sdhci_clear_set_irqs(host, ier, SDHCI_INT_DATA_AVAIL);
+
+ /*
+ * Issue CMD19 repeatedly till Execute Tuning is set to 0 or the number
+ * of loops reaches 40 times or a timeout of 150ms occurs.
+ */
+ timeout = 150;
+ do {
+ struct mmc_command cmd = {0};
+ struct mmc_request mrq = {0};
+
+ if (!tuning_loop_counter && !timeout)
+ break;
+
+ cmd.opcode = MMC_SEND_TUNING_BLOCK;
+ cmd.arg = 0;
+ cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
+ cmd.retries = 0;
+ cmd.data = NULL;
+ cmd.error = 0;
+
+ mrq.cmd = &cmd;
+ host->mrq = &mrq;
+
+ /*
+ * In response to CMD19, the card sends 64 bytes of tuning
+ * block to the Host Controller. So we set the block size
+ * to 64 here.
+ */
+ sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 64), SDHCI_BLOCK_SIZE);
+
+ /*
+ * The tuning block is sent by the card to the host controller.
+ * So we set the TRNS_READ bit in the Transfer Mode register.
+ * This also takes care of setting DMA Enable and Multi Block
+ * Select in the same register to 0.
+ */
+ sdhci_writew(host, SDHCI_TRNS_READ, SDHCI_TRANSFER_MODE);
+
+ sdhci_send_command(host, &cmd);
+
+ host->cmd = NULL;
+ host->mrq = NULL;
+
+ spin_unlock(&host->lock);
+ enable_irq(host->irq);
+
+ /* Wait for Buffer Read Ready interrupt */
+ wait_event_interruptible_timeout(host->buf_ready_int,
+ (host->tuning_done == 1),
+ msecs_to_jiffies(50));
+ disable_irq(host->irq);
+ spin_lock(&host->lock);
+
+ if (!host->tuning_done) {
+ printk(KERN_INFO DRIVER_NAME ": Timeout waiting for "
+ "Buffer Read Ready interrupt during tuning "
+ "procedure, falling back to fixed sampling "
+ "clock\n");
+ ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+ ctrl &= ~SDHCI_CTRL_TUNED_CLK;
+ ctrl &= ~SDHCI_CTRL_EXEC_TUNING;
+ sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
+
+ err = -EIO;
+ goto out;
+ }
+
+ host->tuning_done = 0;
+
+ ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+ tuning_loop_counter--;
+ timeout--;
+ mdelay(1);
+ } while (ctrl & SDHCI_CTRL_EXEC_TUNING);
+
+ /*
+ * The Host Driver has exhausted the maximum number of loops allowed,
+ * so use fixed sampling frequency.
+ */
+ if (!tuning_loop_counter || !timeout) {
+ ctrl &= ~SDHCI_CTRL_TUNED_CLK;
+ sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
+ } else {
+ if (!(ctrl & SDHCI_CTRL_TUNED_CLK)) {
+ printk(KERN_INFO DRIVER_NAME ": Tuning procedure"
+ " failed, falling back to fixed sampling"
+ " clock\n");
+ err = -EIO;
+ }
+ }
+
+out:
+ sdhci_clear_set_irqs(host, SDHCI_INT_DATA_AVAIL, ier);
+ spin_unlock(&host->lock);
+ enable_irq(host->irq);
+
+ return err;
+}
+
static const struct mmc_host_ops sdhci_ops = {
.request = sdhci_request,
.set_ios = sdhci_set_ios,
.get_ro = sdhci_get_ro,
.enable_sdio_irq = sdhci_enable_sdio_irq,
.start_signal_voltage_switch = sdhci_start_signal_voltage_switch,
+ .execute_tuning = sdhci_execute_tuning,
};
/*****************************************************************************\
{
BUG_ON(intmask == 0);
+ /* CMD19 generates _only_ Buffer Read Ready interrupt */
+ if (intmask & SDHCI_INT_DATA_AVAIL) {
+ if (SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND)) ==
+ MMC_SEND_TUNING_BLOCK) {
+ host->tuning_done = 1;
+ wake_up(&host->buf_ready_int);
+ return;
+ }
+ }
+
if (!host->data) {
/*
* The "data complete" interrupt is also used to
if (caps[1] & SDHCI_SUPPORT_DDR50)
mmc->caps |= MMC_CAP_UHS_DDR50;
+ /* Does the host needs tuning for SDR50? */
+ if (caps[1] & SDHCI_USE_SDR50_TUNING)
+ host->flags |= SDHCI_SDR50_NEEDS_TUNING;
+
/* Driver Type(s) (A, C, D) supported by the host */
if (caps[1] & SDHCI_DRIVER_TYPE_A)
mmc->caps |= MMC_CAP_DRIVER_TYPE_A;
setup_timer(&host->timer, sdhci_timeout_timer, (unsigned long)host);
+ if (host->version >= SDHCI_SPEC_300)
+ init_waitqueue_head(&host->buf_ready_int);
+
ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
mmc_hostname(mmc), host);
if (ret)
projects / users / willy / pagecache.git / commitdiff