Merge bk://bk.arm.linux.org.uk/linux-2.6-mmc

into ppc970.osdl.org:/home/torvalds/v2.6/linux

drivers/mmc/mmc_block.c

@@ -200,6 +200,9 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 		}
 		brq.mrq.stop = brq.data.blocks > 1 ? &brq.stop : NULL;
 
+		brq.data.sg = mq->sg;
+		brq.data.sg_len = blk_rq_map_sg(req->q, req, brq.data.sg);
+
 		mmc_wait_for_req(card->host, &brq.mrq);
 		if (brq.cmd.error) {
 			printk(KERN_ERR "%s: error %d sending read/write command\n",

drivers/mmc/mmc_queue.c

@@ -80,7 +80,7 @@ static int mmc_queue_thread(void *d)
 		set_current_state(TASK_INTERRUPTIBLE);
 		if (!blk_queue_plugged(q))
 			mq->req = req = elv_next_request(q);
-		spin_unlock(q->queue_lock);
+		spin_unlock_irq(q->queue_lock);
 
 		if (!req) {
 			if (mq->flags & MMC_QUEUE_EXIT)
@@ -147,19 +147,31 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card, spinlock_t *lock
 	mq->queue->queuedata = mq;
 	mq->req = NULL;
 
+	mq->sg = kmalloc(sizeof(struct scatterlist) * host->max_phys_segs,
+			 GFP_KERNEL);
+	if (!mq->sg) {
+		ret = -ENOMEM;
+		goto cleanup;
+	}
+
 	init_completion(&mq->thread_complete);
 	init_waitqueue_head(&mq->thread_wq);
 	init_MUTEX(&mq->thread_sem);
 
 	ret = kernel_thread(mmc_queue_thread, mq, CLONE_KERNEL);
-	if (ret < 0) {
-		blk_cleanup_queue(mq->queue);
-	} else {
+	if (ret >= 0) {
 		wait_for_completion(&mq->thread_complete);
 		init_completion(&mq->thread_complete);
 		ret = 0;
+		goto out;
 	}
 
+ cleanup:
+	kfree(mq->sg);
+	mq->sg = NULL;
+
+	blk_cleanup_queue(mq->queue);
+ out:
 	return ret;
 }
 EXPORT_SYMBOL(mmc_init_queue);
@@ -169,6 +181,10 @@ void mmc_cleanup_queue(struct mmc_queue *mq)
 	mq->flags |= MMC_QUEUE_EXIT;
 	wake_up(&mq->thread_wq);
 	wait_for_completion(&mq->thread_complete);
+
+	kfree(mq->sg);
+	mq->sg = NULL;
+
 	blk_cleanup_queue(mq->queue);
 
 	mq->card = NULL;

drivers/mmc/mmc_queue.h

@@ -15,6 +15,7 @@ struct mmc_queue {
 	int			(*issue_fn)(struct mmc_queue *, struct request *);
 	void			*data;
 	struct request_queue	*queue;
+	struct scatterlist	*sg;
 };
 
 struct mmc_io_request {

drivers/mmc/mmci.c

@@ -501,7 +501,7 @@ static int mmci_probe(struct amba_device *dev, void *id)
 	 * We can do SGIO
 	 */
 	mmc->max_hw_segs = 16;
-	mmc->max_phys_segs = 16;
+	mmc->max_phys_segs = NR_SG;
 
 	/*
 	 * Since we only have a 16-bit data length register, we must

drivers/mmc/mmci.h

@@ -139,7 +139,6 @@ struct mmci_host {
 	struct timer_list	timer;
 	unsigned int		oldstat;
 
-	struct scatterlist	sg[NR_SG];
 	unsigned int		sg_len;
 
 	/* pio stuff */
@@ -150,14 +149,11 @@ struct mmci_host {
 
 static inline void mmci_init_sg(struct mmci_host *host, struct mmc_data *data)
 {
-	struct scatterlist *sg = host->sg;
-	struct request *req = data->req;
-
 	/*
 	 * Ideally, we want the higher levels to pass us a scatter list.
 	 */
-	host->sg_len = blk_rq_map_sg(req->q, req, sg);
-	host->sg_ptr = sg;
+	host->sg_len = data->sg_len;
+	host->sg_ptr = data->sg;
 	host->sg_off = 0;
 }
 

drivers/mmc/pxamci.c

@@ -44,6 +44,10 @@
 #define DBG(x...)	do { } while (0)
 #endif
 
+#define DRIVER_NAME	"pxa2xx-mci"
+
+#define NR_SG	1
+
 struct pxamci_host {
 	struct mmc_host		*mmc;
 	spinlock_t		lock;
@@ -63,9 +67,8 @@ struct pxamci_host {
 
 	dma_addr_t		sg_dma;
 	struct pxa_dma_desc	*sg_cpu;
+	unsigned int		dma_len;
 
-	dma_addr_t		dma_buf;
-	unsigned int		dma_size;
 	unsigned int		dma_dir;
 };
 
@@ -122,10 +125,9 @@ static void pxamci_disable_irq(struct pxamci_host *host, unsigned int mask)
 static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data)
 {
 	unsigned int nob = data->blocks;
-	unsigned int timeout, size;
-	dma_addr_t dma;
+	unsigned int timeout;
 	u32 dcmd;
-	int i;
+	int i, len;
 
 	host->data = data;
 
@@ -152,35 +154,22 @@ static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data)
 
 	dcmd |= DCMD_BURST32 | DCMD_WIDTH1;
 
-	host->dma_size = data->blocks << data->blksz_bits;
-	host->dma_buf = dma_map_single(mmc_dev(host->mmc), data->req->buffer,
-				       host->dma_size, host->dma_dir);
-
-	for (i = 0, size = host->dma_size, dma = host->dma_buf; size; i++) {
-		u32 len = size;
-
-		if (len > DCMD_LENGTH)
-			len = 0x1000;
+	host->dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
+				   host->dma_dir);
 
+	for (i = 0; i < host->dma_len; i++) {
 		if (data->flags & MMC_DATA_READ) {
 			host->sg_cpu[i].dsadr = host->res->start + MMC_RXFIFO;
-			host->sg_cpu[i].dtadr = dma;
+			host->sg_cpu[i].dtadr = sg_dma_address(&data->sg[i]);
 		} else {
-			host->sg_cpu[i].dsadr = dma;
+			host->sg_cpu[i].dsadr = sg_dma_address(&data->sg[i]);
 			host->sg_cpu[i].dtadr = host->res->start + MMC_TXFIFO;
 		}
-		host->sg_cpu[i].dcmd = dcmd | len;
-
-		dma += len;
-		size -= len;
-
-		if (size) {
+		host->sg_cpu[i].dcmd = dcmd | sg_dma_len(&data->sg[i]);
 		host->sg_cpu[i].ddadr = host->sg_dma + (i + 1) *
 					sizeof(struct pxa_dma_desc);
-		} else {
-			host->sg_cpu[i].ddadr = DDADR_STOP;
-		}
 	}
+	host->sg_cpu[host->dma_len - 1].ddadr = DDADR_STOP;
 	wmb();
 
 	DDADR(host->dma) = host->sg_dma;
@@ -276,7 +265,7 @@ static int pxamci_data_done(struct pxamci_host *host, unsigned int stat)
 		return 0;
 
 	DCSR(host->dma) = 0;
-	dma_unmap_single(mmc_dev(host->mmc), host->dma_buf, host->dma_size,
+	dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_len,
 		     host->dma_dir);
 
 	if (stat & STAT_READ_TIME_OUT)
@@ -429,7 +418,7 @@ static int pxamci_probe(struct device *dev)
 	if (!r || irq == NO_IRQ)
 		return -ENXIO;
 
-	r = request_mem_region(r->start, SZ_4K, "PXAMCI");
+	r = request_mem_region(r->start, SZ_4K, DRIVER_NAME);
 	if (!r)
 		return -EBUSY;
 
@@ -443,6 +432,17 @@ static int pxamci_probe(struct device *dev)
 	mmc->f_min = 312500;
 	mmc->f_max = 20000000;
 
+	/*
+	 * We can do SG-DMA, but we don't because we never know how much
+	 * data we successfully wrote to the card.
+	 */
+	mmc->max_phys_segs = NR_SG;
+
+	/*
+	 * Our hardware DMA can handle a maximum of one page per SG entry.
+	 */
+	mmc->max_seg_size = PAGE_SIZE;
+
 	host = mmc_priv(mmc);
 	host->mmc = mmc;
 	host->dma = -1;
@@ -482,13 +482,14 @@ static int pxamci_probe(struct device *dev)
 	pxa_gpio_mode(GPIO8_MMCCS0_MD);
 	pxa_set_cken(CKEN12_MMC, 1);
 
-	host->dma = pxa_request_dma("PXAMCI", DMA_PRIO_LOW, pxamci_dma_irq, host);
+	host->dma = pxa_request_dma(DRIVER_NAME, DMA_PRIO_LOW,
+				    pxamci_dma_irq, host);
 	if (host->dma < 0) {
 		ret = -EBUSY;
 		goto out;
 	}
 
-	ret = request_irq(host->irq, pxamci_irq, 0, "PXAMCI", host);
+	ret = request_irq(host->irq, pxamci_irq, 0, DRIVER_NAME, host);
 	if (ret)
 		goto out;
 
@@ -579,7 +580,7 @@ static int pxamci_resume(struct device *dev, u32 level)
 #endif
 
 static struct device_driver pxamci_driver = {
-	.name		= "pxa2xx-mci",
+	.name		= DRIVER_NAME,
 	.bus		= &platform_bus_type,
 	.probe		= pxamci_probe,
 	.remove		= pxamci_remove,

include/linux/mmc/mmc.h

@@ -57,7 +57,7 @@ struct mmc_data {
 	unsigned int		timeout_clks;	/* data timeout (in clocks) */
 	unsigned int		blksz_bits;	/* data block size */
 	unsigned int		blocks;		/* number of blocks */
-	struct request		*req;		/* request structure */
+	struct request		*req __attribute__((deprecated));/* request structure (use the sg list instead) */
 	unsigned int		error;		/* data error */
 	unsigned int		flags;
 
@@ -69,6 +69,9 @@ struct mmc_data {
 
 	struct mmc_command	*stop;		/* stop command */
 	struct mmc_request	*mrq;		/* assoicated request */
+
+	unsigned int		sg_len;		/* size of scatter list */
+	struct scatterlist	*sg;		/* I/O scatter list */
 };
 
 struct mmc_request {