s3cmci: Support transfers which are not multiple of 32 bits.

To be able to do SDIO the s3cmci driver has to support non-word-sized
transfers.  Change pio_words into pio_bytes and fix up all the places
where it is used.

This variant of the patch will not overrun the buffer when reading an
odd number of bytes.  When writing, this variant will still read past
the end of the buffer, but since the driver can't support non-word-
aligned transfers anyway, this should not be a problem, since a
word-aligned transfer will never cross a page boundary.

This has been tested with a CSR SDIO Bluetooth Type A device on a
Samsung S3C24A0 processor.

Signed-off-by: Christer Weinigel <christer@weinigel.se>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

2 files changed, 54 insertions, 28 deletions

diff --git a/drivers/mmc/host/s3cmci.c b/drivers/mmc/host/s3cmci.c
index a73ffb9d7b2..bb412331e3d 100644
--- a/drivers/mmc/host/s3cmci.c
+++ b/drivers/mmc/host/s3cmci.c
@@ -190,7 +190,7 @@ static inline void clear_imask(struct s3cmci_host *host)
 }
 
 static inline int get_data_buffer(struct s3cmci_host *host,
-				  u32 *words, u32 **pointer)
+				  u32 *bytes, u32 **pointer)
 {
 	struct scatterlist *sg;
 
@@ -207,7 +207,7 @@ static inline int get_data_buffer(struct s3cmci_host *host,
 	}
 	sg = &host->mrq->data->sg[host->pio_sgptr];
 
-	*words = sg->length >> 2;
+	*bytes = sg->length;
 	*pointer = sg_virt(sg);
 
 	host->pio_sgptr++;
@@ -223,7 +223,7 @@ static inline u32 fifo_count(struct s3cmci_host *host)
 	u32 fifostat = readl(host->base + S3C2410_SDIFSTA);
 
 	fifostat &= S3C2410_SDIFSTA_COUNTMASK;
-	return fifostat >> 2;
+	return fifostat;
 }
 
 static inline u32 fifo_free(struct s3cmci_host *host)
@@ -231,13 +231,14 @@ static inline u32 fifo_free(struct s3cmci_host *host)
 	u32 fifostat = readl(host->base + S3C2410_SDIFSTA);
 
 	fifostat &= S3C2410_SDIFSTA_COUNTMASK;
-	return (63 - fifostat) >> 2;
+	return 63 - fifostat;
 }
 
 static void do_pio_read(struct s3cmci_host *host)
 {
 	int res;
 	u32 fifo;
+	u32 fifo_words;
 	void __iomem *from_ptr;
 
 	/* write real prescaler to host, it might be set slow to fix */
@@ -246,8 +247,8 @@ static void do_pio_read(struct s3cmci_host *host)
 	from_ptr = host->base + host->sdidata;
 
 	while ((fifo = fifo_count(host))) {
-		if (!host->pio_words) {
-			res = get_data_buffer(host, &host->pio_words,
+		if (!host->pio_bytes) {
+			res = get_data_buffer(host, &host->pio_bytes,
 					      &host->pio_ptr);
 			if (res) {
 				host->pio_active = XFER_NONE;
@@ -260,26 +261,45 @@ static void do_pio_read(struct s3cmci_host *host)
 
 			dbg(host, dbg_pio,
 			    "pio_read(): new target: [%i]@[%p]\n",
-			    host->pio_words, host->pio_ptr);
+			    host->pio_bytes, host->pio_ptr);
 		}
 
 		dbg(host, dbg_pio,
 		    "pio_read(): fifo:[%02i] buffer:[%03i] dcnt:[%08X]\n",
-		    fifo, host->pio_words,
+		    fifo, host->pio_bytes,
 		    readl(host->base + S3C2410_SDIDCNT));
 
-		if (fifo > host->pio_words)
-			fifo = host->pio_words;
+		/* If we have reached the end of the block, we can
+		 * read a word and get 1 to 3 bytes.  If we in the
+		 * middle of the block, we have to read full words,
+		 * otherwise we will write garbage, so round down to
+		 * an even multiple of 4. */
+		if (fifo >= host->pio_bytes)
+			fifo = host->pio_bytes;
+		else
+			fifo -= fifo & 3;
 
-		host->pio_words -= fifo;
+		host->pio_bytes -= fifo;
 		host->pio_count += fifo;
 
-		while (fifo--)
+		fifo_words = fifo >> 2;
+		while (fifo_words--)
 			*(host->pio_ptr++) = readl(from_ptr);
+
+		if (fifo & 3) {
+			u32 n = fifo & 3;
+			u32 data = readl(from_ptr);
+			u8 *p = (u8 *)host->pio_ptr;
+
+			while (n--) {
+				*p++ = data;
+				data >>= 8;
+			}
+		}
 	}
 
-	if (!host->pio_words) {
-		res = get_data_buffer(host, &host->pio_words, &host->pio_ptr);
+	if (!host->pio_bytes) {
+		res = get_data_buffer(host, &host->pio_bytes, &host->pio_ptr);
 		if (res) {
 			dbg(host, dbg_pio,
 			    "pio_read(): complete (no more buffers).\n");
@@ -303,8 +323,8 @@ static void do_pio_write(struct s3cmci_host *host)
 	to_ptr = host->base + host->sdidata;
 
 	while ((fifo = fifo_free(host))) {
-		if (!host->pio_words) {
-			res = get_data_buffer(host, &host->pio_words,
+		if (!host->pio_bytes) {
+			res = get_data_buffer(host, &host->pio_bytes,
 							&host->pio_ptr);
 			if (res) {
 				dbg(host, dbg_pio,
@@ -316,16 +336,23 @@ static void do_pio_write(struct s3cmci_host *host)
 
 			dbg(host, dbg_pio,
 			    "pio_write(): new source: [%i]@[%p]\n",
-			    host->pio_words, host->pio_ptr);
+			    host->pio_bytes, host->pio_ptr);
 
 		}
 
-		if (fifo > host->pio_words)
-			fifo = host->pio_words;
+		/* If we have reached the end of the block, we have to
+		 * write exactly the remaining number of bytes.  If we
+		 * in the middle of the block, we have to write full
+		 * words, so round down to an even multiple of 4. */
+		if (fifo >= host->pio_bytes)
+			fifo = host->pio_bytes;
+		else
+			fifo -= fifo & 3;
 
-		host->pio_words -= fifo;
+		host->pio_bytes -= fifo;
 		host->pio_count += fifo;
 
+		fifo = (fifo + 3) >> 2;
 		while (fifo--)
 			writel(*(host->pio_ptr++), to_ptr);
 	}
@@ -350,9 +377,9 @@ static void pio_tasklet(unsigned long data)
 		clear_imask(host);
 		if (host->pio_active != XFER_NONE) {
 			dbg(host, dbg_err, "unfinished %s "
-			    "- pio_count:[%u] pio_words:[%u]\n",
+			    "- pio_count:[%u] pio_bytes:[%u]\n",
 			    (host->pio_active == XFER_READ) ? "read" : "write",
-			    host->pio_count, host->pio_words);
+			    host->pio_count, host->pio_bytes);
 
 			if (host->mrq->data)
 				host->mrq->data->error = -EINVAL;
@@ -813,11 +840,10 @@ static int s3cmci_setup_data(struct s3cmci_host *host, struct mmc_data *data)
 		/* We cannot deal with unaligned blocks with more than
 		 * one block being transfered. */
 
-		if (data->blocks > 1)
+		if (data->blocks > 1) {
+			pr_warning("%s: can't do non-word sized block transfers (blksz %d)\n", __func__, data->blksz);
 			return -EINVAL;
-
-		/* No support yet for non-word block transfers. */
-		return -EINVAL;
+		}
 	}
 
 	while (readl(host->base + S3C2410_SDIDSTA) &
@@ -897,7 +923,7 @@ static int s3cmci_prepare_pio(struct s3cmci_host *host, struct mmc_data *data)
 	BUG_ON((data->flags & BOTH_DIR) == BOTH_DIR);
 
 	host->pio_sgptr = 0;
-	host->pio_words = 0;
+	host->pio_bytes = 0;
 	host->pio_count = 0;
 	host->pio_active = rw ? XFER_WRITE : XFER_READ;
 
diff --git a/drivers/mmc/host/s3cmci.h b/drivers/mmc/host/s3cmci.h
index 7e39109587f..ca1ba3d58cf 100644
--- a/drivers/mmc/host/s3cmci.h
+++ b/drivers/mmc/host/s3cmci.h
@@ -51,7 +51,7 @@ struct s3cmci_host {
 	int			dma_complete;
 
 	u32			pio_sgptr;
-	u32			pio_words;
+	u32			pio_bytes;
 	u32			pio_count;
 	u32			*pio_ptr;
 #define XFER_NONE 0