Beispiel #1
0
static void ace_fsm_dostate(struct ace_device *ace)
{
	struct request *req;
	u32 status;
	u16 val;
	int count;

#if defined(DEBUG)
	dev_dbg(ace->dev, "fsm_state=%i, id_req_count=%i\n",
		ace->fsm_state, ace->id_req_count);
#endif

	/* Verify that there is actually a CF in the slot. If not, then
	 * bail out back to the idle state and wake up all the waiters */
	status = ace_in32(ace, ACE_STATUS);
	if ((status & ACE_STATUS_CFDETECT) == 0) {
		ace->fsm_state = ACE_FSM_STATE_IDLE;
		ace->media_change = 1;
		set_capacity(ace->gd, 0);
		dev_info(ace->dev, "No CF in slot\n");

		/* Drop all in-flight and pending requests */
		if (ace->req) {
			__blk_end_request_all(ace->req, -EIO);
			ace->req = NULL;
		}
		while ((req = blk_fetch_request(ace->queue)) != NULL)
			__blk_end_request_all(req, -EIO);

		/* Drop back to IDLE state and notify waiters */
		ace->fsm_state = ACE_FSM_STATE_IDLE;
		ace->id_result = -EIO;
		while (ace->id_req_count) {
			complete(&ace->id_completion);
			ace->id_req_count--;
		}
	}

	switch (ace->fsm_state) {
	case ACE_FSM_STATE_IDLE:
		/* See if there is anything to do */
		if (ace->id_req_count || ace_get_next_request(ace->queue)) {
			ace->fsm_iter_num++;
			ace->fsm_state = ACE_FSM_STATE_REQ_LOCK;
			mod_timer(&ace->stall_timer, jiffies + HZ);
			if (!timer_pending(&ace->stall_timer))
				add_timer(&ace->stall_timer);
			break;
		}
		del_timer(&ace->stall_timer);
		ace->fsm_continue_flag = 0;
		break;

	case ACE_FSM_STATE_REQ_LOCK:
		if (ace_in(ace, ACE_STATUS) & ACE_STATUS_MPULOCK) {
			/* Already have the lock, jump to next state */
			ace->fsm_state = ACE_FSM_STATE_WAIT_CFREADY;
			break;
		}

		/* Request the lock */
		val = ace_in(ace, ACE_CTRL);
		ace_out(ace, ACE_CTRL, val | ACE_CTRL_LOCKREQ);
		ace->fsm_state = ACE_FSM_STATE_WAIT_LOCK;
		break;

	case ACE_FSM_STATE_WAIT_LOCK:
		if (ace_in(ace, ACE_STATUS) & ACE_STATUS_MPULOCK) {
			/* got the lock; move to next state */
			ace->fsm_state = ACE_FSM_STATE_WAIT_CFREADY;
			break;
		}

		/* wait a bit for the lock */
		ace_fsm_yield(ace);
		break;

	case ACE_FSM_STATE_WAIT_CFREADY:
		status = ace_in32(ace, ACE_STATUS);
		if (!(status & ACE_STATUS_RDYFORCFCMD) ||
		    (status & ACE_STATUS_CFBSY)) {
			/* CF card isn't ready; it needs to be polled */
			ace_fsm_yield(ace);
			break;
		}

		/* Device is ready for command; determine what to do next */
		if (ace->id_req_count)
			ace->fsm_state = ACE_FSM_STATE_IDENTIFY_PREPARE;
		else
			ace->fsm_state = ACE_FSM_STATE_REQ_PREPARE;
		break;

	case ACE_FSM_STATE_IDENTIFY_PREPARE:
		/* Send identify command */
		ace->fsm_task = ACE_TASK_IDENTIFY;
		ace->data_ptr = ace->cf_id;
		ace->data_count = ACE_BUF_PER_SECTOR;
		ace_out(ace, ACE_SECCNTCMD, ACE_SECCNTCMD_IDENTIFY);

		/* As per datasheet, put config controller in reset */
		val = ace_in(ace, ACE_CTRL);
		ace_out(ace, ACE_CTRL, val | ACE_CTRL_CFGRESET);

		/* irq handler takes over from this point; wait for the
		 * transfer to complete */
		ace->fsm_state = ACE_FSM_STATE_IDENTIFY_TRANSFER;
		ace_fsm_yieldirq(ace);
		break;

	case ACE_FSM_STATE_IDENTIFY_TRANSFER:
		/* Check that the sysace is ready to receive data */
		status = ace_in32(ace, ACE_STATUS);
		if (status & ACE_STATUS_CFBSY) {
			dev_dbg(ace->dev, "CFBSY set; t=%i iter=%i dc=%i\n",
				ace->fsm_task, ace->fsm_iter_num,
				ace->data_count);
			ace_fsm_yield(ace);
			break;
		}
		if (!(status & ACE_STATUS_DATABUFRDY)) {
			ace_fsm_yield(ace);
			break;
		}

		/* Transfer the next buffer */
		ace->reg_ops->datain(ace);
		ace->data_count--;

		/* If there are still buffers to be transfers; jump out here */
		if (ace->data_count != 0) {
			ace_fsm_yieldirq(ace);
			break;
		}

		/* transfer finished; kick state machine */
		dev_dbg(ace->dev, "identify finished\n");
		ace->fsm_state = ACE_FSM_STATE_IDENTIFY_COMPLETE;
		break;

	case ACE_FSM_STATE_IDENTIFY_COMPLETE:
		ace_fix_driveid(ace->cf_id);
		ace_dump_mem(ace->cf_id, 512);	/* Debug: Dump out disk ID */

		if (ace->data_result) {
			/* Error occured, disable the disk */
			ace->media_change = 1;
			set_capacity(ace->gd, 0);
			dev_err(ace->dev, "error fetching CF id (%i)\n",
				ace->data_result);
		} else {
			ace->media_change = 0;

			/* Record disk parameters */
			set_capacity(ace->gd,
				ata_id_u32(ace->cf_id, ATA_ID_LBA_CAPACITY));
			dev_info(ace->dev, "capacity: %i sectors\n",
				ata_id_u32(ace->cf_id, ATA_ID_LBA_CAPACITY));
		}

		/* We're done, drop to IDLE state and notify waiters */
		ace->fsm_state = ACE_FSM_STATE_IDLE;
		ace->id_result = ace->data_result;
		while (ace->id_req_count) {
			complete(&ace->id_completion);
			ace->id_req_count--;
		}
		break;

	case ACE_FSM_STATE_REQ_PREPARE:
		req = ace_get_next_request(ace->queue);
		if (!req) {
			ace->fsm_state = ACE_FSM_STATE_IDLE;
			break;
		}
		blk_start_request(req);

		/* Okay, it's a data request, set it up for transfer */
		dev_dbg(ace->dev,
			"request: sec=%llx hcnt=%x, ccnt=%x, dir=%i\n",
			(unsigned long long)blk_rq_pos(req),
			blk_rq_sectors(req), blk_rq_cur_sectors(req),
			rq_data_dir(req));

		ace->req = req;
		ace->data_ptr = req->buffer;
		ace->data_count = blk_rq_cur_sectors(req) * ACE_BUF_PER_SECTOR;
		ace_out32(ace, ACE_MPULBA, blk_rq_pos(req) & 0x0FFFFFFF);

		count = blk_rq_sectors(req);
		if (rq_data_dir(req)) {
			/* Kick off write request */
			dev_dbg(ace->dev, "write data\n");
			ace->fsm_task = ACE_TASK_WRITE;
			ace_out(ace, ACE_SECCNTCMD,
				count | ACE_SECCNTCMD_WRITE_DATA);
		} else {
			/* Kick off read request */
			dev_dbg(ace->dev, "read data\n");
			ace->fsm_task = ACE_TASK_READ;
			ace_out(ace, ACE_SECCNTCMD,
				count | ACE_SECCNTCMD_READ_DATA);
		}

		/* As per datasheet, put config controller in reset */
		val = ace_in(ace, ACE_CTRL);
		ace_out(ace, ACE_CTRL, val | ACE_CTRL_CFGRESET);

		/* Move to the transfer state.  The systemace will raise
		 * an interrupt once there is something to do
		 */
		ace->fsm_state = ACE_FSM_STATE_REQ_TRANSFER;
		if (ace->fsm_task == ACE_TASK_READ)
			ace_fsm_yieldirq(ace);	/* wait for data ready */
		break;

	case ACE_FSM_STATE_REQ_TRANSFER:
		/* Check that the sysace is ready to receive data */
		status = ace_in32(ace, ACE_STATUS);
		if (status & ACE_STATUS_CFBSY) {
			dev_dbg(ace->dev,
				"CFBSY set; t=%i iter=%i c=%i dc=%i irq=%i\n",
				ace->fsm_task, ace->fsm_iter_num,
				blk_rq_cur_sectors(ace->req) * 16,
				ace->data_count, ace->in_irq);
			ace_fsm_yield(ace);	/* need to poll CFBSY bit */
			break;
		}
		if (!(status & ACE_STATUS_DATABUFRDY)) {
			dev_dbg(ace->dev,
				"DATABUF not set; t=%i iter=%i c=%i dc=%i irq=%i\n",
				ace->fsm_task, ace->fsm_iter_num,
				blk_rq_cur_sectors(ace->req) * 16,
				ace->data_count, ace->in_irq);
			ace_fsm_yieldirq(ace);
			break;
		}

		/* Transfer the next buffer */
		if (ace->fsm_task == ACE_TASK_WRITE)
			ace->reg_ops->dataout(ace);
		else
			ace->reg_ops->datain(ace);
		ace->data_count--;

		/* If there are still buffers to be transfers; jump out here */
		if (ace->data_count != 0) {
			ace_fsm_yieldirq(ace);
			break;
		}

		/* bio finished; is there another one? */
		if (__blk_end_request_cur(ace->req, 0)) {
			/* dev_dbg(ace->dev, "next block; h=%u c=%u\n",
			 *      blk_rq_sectors(ace->req),
			 *      blk_rq_cur_sectors(ace->req));
			 */
			ace->data_ptr = ace->req->buffer;
			ace->data_count = blk_rq_cur_sectors(ace->req) * 16;
			ace_fsm_yieldirq(ace);
			break;
		}

		ace->fsm_state = ACE_FSM_STATE_REQ_COMPLETE;
		break;

	case ACE_FSM_STATE_REQ_COMPLETE:
		ace->req = NULL;

		/* Finished request; go to idle state */
		ace->fsm_state = ACE_FSM_STATE_IDLE;
		break;

	default:
		ace->fsm_state = ACE_FSM_STATE_IDLE;
		break;
	}
}
static void ace_fsm_dostate(struct ace_device *ace)
{
	struct request *req;
	u32 status;
	u16 val;
	int count;

#if defined(DEBUG)
	dev_dbg(ace->dev, "fsm_state=%i, id_req_count=%i\n",
		ace->fsm_state, ace->id_req_count);
#endif

	/*                                                             
                                                                */
	status = ace_in32(ace, ACE_STATUS);
	if ((status & ACE_STATUS_CFDETECT) == 0) {
		ace->fsm_state = ACE_FSM_STATE_IDLE;
		ace->media_change = 1;
		set_capacity(ace->gd, 0);
		dev_info(ace->dev, "No CF in slot\n");

		/*                                         */
		if (ace->req) {
			__blk_end_request_all(ace->req, -EIO);
			ace->req = NULL;
		}
		while ((req = blk_fetch_request(ace->queue)) != NULL)
			__blk_end_request_all(req, -EIO);

		/*                                            */
		ace->fsm_state = ACE_FSM_STATE_IDLE;
		ace->id_result = -EIO;
		while (ace->id_req_count) {
			complete(&ace->id_completion);
			ace->id_req_count--;
		}
	}

	switch (ace->fsm_state) {
	case ACE_FSM_STATE_IDLE:
		/*                                */
		if (ace->id_req_count || ace_get_next_request(ace->queue)) {
			ace->fsm_iter_num++;
			ace->fsm_state = ACE_FSM_STATE_REQ_LOCK;
			mod_timer(&ace->stall_timer, jiffies + HZ);
			if (!timer_pending(&ace->stall_timer))
				add_timer(&ace->stall_timer);
			break;
		}
		del_timer(&ace->stall_timer);
		ace->fsm_continue_flag = 0;
		break;

	case ACE_FSM_STATE_REQ_LOCK:
		if (ace_in(ace, ACE_STATUS) & ACE_STATUS_MPULOCK) {
			/*                                           */
			ace->fsm_state = ACE_FSM_STATE_WAIT_CFREADY;
			break;
		}

		/*                  */
		val = ace_in(ace, ACE_CTRL);
		ace_out(ace, ACE_CTRL, val | ACE_CTRL_LOCKREQ);
		ace->fsm_state = ACE_FSM_STATE_WAIT_LOCK;
		break;

	case ACE_FSM_STATE_WAIT_LOCK:
		if (ace_in(ace, ACE_STATUS) & ACE_STATUS_MPULOCK) {
			/*                                  */
			ace->fsm_state = ACE_FSM_STATE_WAIT_CFREADY;
			break;
		}

		/*                         */
		ace_fsm_yield(ace);
		break;

	case ACE_FSM_STATE_WAIT_CFREADY:
		status = ace_in32(ace, ACE_STATUS);
		if (!(status & ACE_STATUS_RDYFORCFCMD) ||
		    (status & ACE_STATUS_CFBSY)) {
			/*                                            */
			ace_fsm_yield(ace);
			break;
		}

		/*                                                        */
		if (ace->id_req_count)
			ace->fsm_state = ACE_FSM_STATE_IDENTIFY_PREPARE;
		else
			ace->fsm_state = ACE_FSM_STATE_REQ_PREPARE;
		break;

	case ACE_FSM_STATE_IDENTIFY_PREPARE:
		/*                       */
		ace->fsm_task = ACE_TASK_IDENTIFY;
		ace->data_ptr = ace->cf_id;
		ace->data_count = ACE_BUF_PER_SECTOR;
		ace_out(ace, ACE_SECCNTCMD, ACE_SECCNTCMD_IDENTIFY);

		/*                                                  */
		val = ace_in(ace, ACE_CTRL);
		ace_out(ace, ACE_CTRL, val | ACE_CTRL_CFGRESET);

		/*                                                     
                          */
		ace->fsm_state = ACE_FSM_STATE_IDENTIFY_TRANSFER;
		ace_fsm_yieldirq(ace);
		break;

	case ACE_FSM_STATE_IDENTIFY_TRANSFER:
		/*                                                */
		status = ace_in32(ace, ACE_STATUS);
		if (status & ACE_STATUS_CFBSY) {
			dev_dbg(ace->dev, "CFBSY set; t=%i iter=%i dc=%i\n",
				ace->fsm_task, ace->fsm_iter_num,
				ace->data_count);
			ace_fsm_yield(ace);
			break;
		}
		if (!(status & ACE_STATUS_DATABUFRDY)) {
			ace_fsm_yield(ace);
			break;
		}

		/*                          */
		ace->reg_ops->datain(ace);
		ace->data_count--;

		/*                                                           */
		if (ace->data_count != 0) {
			ace_fsm_yieldirq(ace);
			break;
		}

		/*                                       */
		dev_dbg(ace->dev, "identify finished\n");
		ace->fsm_state = ACE_FSM_STATE_IDENTIFY_COMPLETE;
		break;

	case ACE_FSM_STATE_IDENTIFY_COMPLETE:
		ace_fix_driveid(ace->cf_id);
		ace_dump_mem(ace->cf_id, 512);	/*                         */

		if (ace->data_result) {
			/*                                  */
			ace->media_change = 1;
			set_capacity(ace->gd, 0);
			dev_err(ace->dev, "error fetching CF id (%i)\n",
				ace->data_result);
		} else {
			ace->media_change = 0;

			/*                        */
			set_capacity(ace->gd,
				ata_id_u32(ace->cf_id, ATA_ID_LBA_CAPACITY));
			dev_info(ace->dev, "capacity: %i sectors\n",
				ata_id_u32(ace->cf_id, ATA_ID_LBA_CAPACITY));
		}

		/*                                                   */
		ace->fsm_state = ACE_FSM_STATE_IDLE;
		ace->id_result = ace->data_result;
		while (ace->id_req_count) {
			complete(&ace->id_completion);
			ace->id_req_count--;
		}
		break;

	case ACE_FSM_STATE_REQ_PREPARE:
		req = ace_get_next_request(ace->queue);
		if (!req) {
			ace->fsm_state = ACE_FSM_STATE_IDLE;
			break;
		}
		blk_start_request(req);

		/*                                                   */
		dev_dbg(ace->dev,
			"request: sec=%llx hcnt=%x, ccnt=%x, dir=%i\n",
			(unsigned long long)blk_rq_pos(req),
			blk_rq_sectors(req), blk_rq_cur_sectors(req),
			rq_data_dir(req));

		ace->req = req;
		ace->data_ptr = req->buffer;
		ace->data_count = blk_rq_cur_sectors(req) * ACE_BUF_PER_SECTOR;
		ace_out32(ace, ACE_MPULBA, blk_rq_pos(req) & 0x0FFFFFFF);

		count = blk_rq_sectors(req);
		if (rq_data_dir(req)) {
			/*                        */
			dev_dbg(ace->dev, "write data\n");
			ace->fsm_task = ACE_TASK_WRITE;
			ace_out(ace, ACE_SECCNTCMD,
				count | ACE_SECCNTCMD_WRITE_DATA);
		} else {
			/*                       */
			dev_dbg(ace->dev, "read data\n");
			ace->fsm_task = ACE_TASK_READ;
			ace_out(ace, ACE_SECCNTCMD,
				count | ACE_SECCNTCMD_READ_DATA);
		}

		/*                                                  */
		val = ace_in(ace, ACE_CTRL);
		ace_out(ace, ACE_CTRL, val | ACE_CTRL_CFGRESET);

		/*                                                      
                                               
   */
		ace->fsm_state = ACE_FSM_STATE_REQ_TRANSFER;
		if (ace->fsm_task == ACE_TASK_READ)
			ace_fsm_yieldirq(ace);	/*                     */
		break;

	case ACE_FSM_STATE_REQ_TRANSFER:
		/*                                                */
		status = ace_in32(ace, ACE_STATUS);
		if (status & ACE_STATUS_CFBSY) {
			dev_dbg(ace->dev,
				"CFBSY set; t=%i iter=%i c=%i dc=%i irq=%i\n",
				ace->fsm_task, ace->fsm_iter_num,
				blk_rq_cur_sectors(ace->req) * 16,
				ace->data_count, ace->in_irq);
			ace_fsm_yield(ace);	/*                        */
			break;
		}
		if (!(status & ACE_STATUS_DATABUFRDY)) {
			dev_dbg(ace->dev,
				"DATABUF not set; t=%i iter=%i c=%i dc=%i irq=%i\n",
				ace->fsm_task, ace->fsm_iter_num,
				blk_rq_cur_sectors(ace->req) * 16,
				ace->data_count, ace->in_irq);
			ace_fsm_yieldirq(ace);
			break;
		}

		/*                          */
		if (ace->fsm_task == ACE_TASK_WRITE)
			ace->reg_ops->dataout(ace);
		else
			ace->reg_ops->datain(ace);
		ace->data_count--;

		/*                                                           */
		if (ace->data_count != 0) {
			ace_fsm_yieldirq(ace);
			break;
		}

		/*                                     */
		if (__blk_end_request_cur(ace->req, 0)) {
			/*                                             
                                    
                                         
    */
			ace->data_ptr = ace->req->buffer;
			ace->data_count = blk_rq_cur_sectors(ace->req) * 16;
			ace_fsm_yieldirq(ace);
			break;
		}

		ace->fsm_state = ACE_FSM_STATE_REQ_COMPLETE;
		break;

	case ACE_FSM_STATE_REQ_COMPLETE:
		ace->req = NULL;

		/*                                    */
		ace->fsm_state = ACE_FSM_STATE_IDLE;
		break;

	default:
		ace->fsm_state = ACE_FSM_STATE_IDLE;
		break;
	}
}