[patch 3/5] s3cmci: Support transfers which are not multiple of 32 bits.

Ben Dooks
2008-10-10T10:34:42Z

[-- Attachment #1: thirdparty/christer-mmc-byte-alignment.patch --]
[-- Type: text/plain, Size: 6890 bytes --]

From: Christer Weinigel <christer@weinigel.se>

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>

Index: linux-2.6.27-rc5-quilt1/drivers/mmc/host/s3cmci.c
===================================================================
--- linux-2.6.27-rc5-quilt1.orig/drivers/mmc/host/s3cmci.c 2008-09-04 11:35:38.000000000 +0100
+++ linux-2.6.27-rc5-quilt1/drivers/mmc/host/s3cmci.c 2008-09-08 16:23:58.000000000 +0100
@@ -190,7 +190,7 @@ static inline void clear_imask(struct s3
}

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
}
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 s3cm
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 s3cmc
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_ho
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_ho

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_h
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_h

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 da
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 s3cm
/* 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 s3c
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;

Index: linux-2.6.27-rc5-quilt1/drivers/mmc/host/s3cmci.h
===================================================================
--- linux-2.6.27-rc5-quilt1.orig/drivers/mmc/host/s3cmci.h 2008-09-04 11:35:38.000000000 +0100
+++ linux-2.6.27-rc5-quilt1/drivers/mmc/host/s3cmci.h 2008-09-08 16:23:58.000000000 +0100
@@ -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