static irqreturn_t mmc_omap_irq()

in host/omap.c [719:852]

• 114 lines of code
• 31 McCabe index (conditional complexity)

static irqreturn_t mmc_omap_irq(int irq, void *dev_id)
{
	struct mmc_omap_host * host = (struct mmc_omap_host *)dev_id;
	u16 status;
	int end_command;
	int end_transfer;
	int transfer_error, cmd_error;

	if (host->cmd == NULL && host->data == NULL) {
		status = OMAP_MMC_READ(host, STAT);
		dev_info(mmc_dev(host->slots[0]->mmc),
			 "Spurious IRQ 0x%04x\n", status);
		if (status != 0) {
			OMAP_MMC_WRITE(host, STAT, status);
			OMAP_MMC_WRITE(host, IE, 0);
		}
		return IRQ_HANDLED;
	}

	end_command = 0;
	end_transfer = 0;
	transfer_error = 0;
	cmd_error = 0;

	while ((status = OMAP_MMC_READ(host, STAT)) != 0) {
		int cmd;

		OMAP_MMC_WRITE(host, STAT, status);
		if (host->cmd != NULL)
			cmd = host->cmd->opcode;
		else
			cmd = -1;
		dev_dbg(mmc_dev(host->mmc), "MMC IRQ %04x (CMD %d): ",
			status, cmd);
		mmc_omap_report_irq(host, status);

		if (host->total_bytes_left) {
			if ((status & OMAP_MMC_STAT_A_FULL) ||
			    (status & OMAP_MMC_STAT_END_OF_DATA))
				mmc_omap_xfer_data(host, 0);
			if (status & OMAP_MMC_STAT_A_EMPTY)
				mmc_omap_xfer_data(host, 1);
		}

		if (status & OMAP_MMC_STAT_END_OF_DATA)
			end_transfer = 1;

		if (status & OMAP_MMC_STAT_DATA_TOUT) {
			dev_dbg(mmc_dev(host->mmc), "data timeout (CMD%d)\n",
				cmd);
			if (host->data) {
				host->data->error = -ETIMEDOUT;
				transfer_error = 1;
			}
		}

		if (status & OMAP_MMC_STAT_DATA_CRC) {
			if (host->data) {
				host->data->error = -EILSEQ;
				dev_dbg(mmc_dev(host->mmc),
					 "data CRC error, bytes left %d\n",
					host->total_bytes_left);
				transfer_error = 1;
			} else {
				dev_dbg(mmc_dev(host->mmc), "data CRC error\n");
			}
		}

		if (status & OMAP_MMC_STAT_CMD_TOUT) {
			/* Timeouts are routine with some commands */
			if (host->cmd) {
				struct mmc_omap_slot *slot =
					host->current_slot;
				if (slot == NULL ||
				    !mmc_omap_cover_is_open(slot))
					dev_err(mmc_dev(host->mmc),
						"command timeout (CMD%d)\n",
						cmd);
				host->cmd->error = -ETIMEDOUT;
				end_command = 1;
				cmd_error = 1;
			}
		}

		if (status & OMAP_MMC_STAT_CMD_CRC) {
			if (host->cmd) {
				dev_err(mmc_dev(host->mmc),
					"command CRC error (CMD%d, arg 0x%08x)\n",
					cmd, host->cmd->arg);
				host->cmd->error = -EILSEQ;
				end_command = 1;
				cmd_error = 1;
			} else
				dev_err(mmc_dev(host->mmc),
					"command CRC error without cmd?\n");
		}

		if (status & OMAP_MMC_STAT_CARD_ERR) {
			dev_dbg(mmc_dev(host->mmc),
				"ignoring card status error (CMD%d)\n",
				cmd);
			end_command = 1;
		}

		/*
		 * NOTE: On 1610 the END_OF_CMD may come too early when
		 * starting a write
		 */
		if ((status & OMAP_MMC_STAT_END_OF_CMD) &&
		    (!(status & OMAP_MMC_STAT_A_EMPTY))) {
			end_command = 1;
		}
	}

	if (cmd_error && host->data) {
		del_timer(&host->cmd_abort_timer);
		host->abort = 1;
		OMAP_MMC_WRITE(host, IE, 0);
		disable_irq_nosync(host->irq);
		queue_work(host->mmc_omap_wq, &host->cmd_abort_work);
		return IRQ_HANDLED;
	}

	if (end_command && host->cmd)
		mmc_omap_cmd_done(host, host->cmd);
	if (host->data != NULL) {
		if (transfer_error)
			mmc_omap_xfer_done(host, host->data);
		else if (end_transfer)
			mmc_omap_end_of_data(host, host->data);
	}

	return IRQ_HANDLED;
}