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authorMartyn Welch <martyn.welch@ge.com>2012-07-19 17:48:46 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-07-19 15:39:39 -0700
commit363e2e6f9e2d9ca53fb87e3988e2a225dc879aa4 (patch)
tree98e316e22bea15046819c1d44338b99bc48009fe /drivers/vme
parent59e32c490e476dba2938dde9fd4d4eaf5d0f8121 (diff)
downloadlinux-363e2e6f9e2d9ca53fb87e3988e2a225dc879aa4.tar.gz
VME: Prevent D16 cycles being split into 8-bit blocks
The memcpy_fromio() and memcpy_toio() functions use the __memcpy() function, at least on x86. This function carries out transfers smaller than 32 bits as multiple 8 bit transfers, causing a single (aligned) 16 bit transfer to be split into 2 8 bit transfers which may not be supported by the target VME device. The commit 53059aa05988761a738fa8bc082bbf3c5d4462d1 fixed this for the ca91cx42, however this was not fixed for the tsi148 at the time. This patch uses the same algorithm to fix the tsi148. Reported-by: Daniel Lambert <daniel.lambert@clermont.in2p3.fr> Signed-off-by: Martyn Welch <martyn.welch@ge.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/vme')
-rw-r--r--drivers/vme/bridges/vme_tsi148.c85
1 files changed, 83 insertions, 2 deletions
diff --git a/drivers/vme/bridges/vme_tsi148.c b/drivers/vme/bridges/vme_tsi148.c
index f6385f7a66d..880d9242e34 100644
--- a/drivers/vme/bridges/vme_tsi148.c
+++ b/drivers/vme/bridges/vme_tsi148.c
@@ -1263,12 +1263,55 @@ static ssize_t tsi148_master_read(struct vme_master_resource *image, void *buf,
u32 aspace, cycle, dwidth;
struct vme_bus_error *vme_err = NULL;
struct vme_bridge *tsi148_bridge;
+ void *addr = image->kern_base + offset;
+ unsigned int done = 0;
+ unsigned int count32;
tsi148_bridge = image->parent;
spin_lock(&image->lock);
- memcpy_fromio(buf, image->kern_base + offset, (unsigned int)count);
+ /* The following code handles VME address alignment. We cannot use
+ * memcpy_xxx directly here because it may cut small data transfers in
+ * to 8-bit cycles, thus making D16 cycle impossible.
+ * On the other hand, the bridge itself assures that the maximum data
+ * cycle configured for the transfer is used and splits it
+ * automatically for non-aligned addresses, so we don't want the
+ * overhead of needlessly forcing small transfers for the entire cycle.
+ */
+ if ((uintptr_t)addr & 0x1) {
+ *(u8 *)buf = ioread8(addr);
+ done += 1;
+ if (done == count)
+ goto out;
+ }
+ if ((uintptr_t)addr & 0x2) {
+ if ((count - done) < 2) {
+ *(u8 *)(buf + done) = ioread8(addr + done);
+ done += 1;
+ goto out;
+ } else {
+ *(u16 *)(buf + done) = ioread16(addr + done);
+ done += 2;
+ }
+ }
+
+ count32 = (count - done) & ~0x3;
+ if (count32 > 0) {
+ memcpy_fromio(buf + done, addr + done, count32);
+ done += count32;
+ }
+
+ if ((count - done) & 0x2) {
+ *(u16 *)(buf + done) = ioread16(addr + done);
+ done += 2;
+ }
+ if ((count - done) & 0x1) {
+ *(u8 *)(buf + done) = ioread8(addr + done);
+ done += 1;
+ }
+
+out:
retval = count;
if (!err_chk)
@@ -1301,6 +1344,9 @@ static ssize_t tsi148_master_write(struct vme_master_resource *image, void *buf,
int retval = 0, enabled;
unsigned long long vme_base, size;
u32 aspace, cycle, dwidth;
+ void *addr = image->kern_base + offset;
+ unsigned int done = 0;
+ unsigned int count32;
struct vme_bus_error *vme_err = NULL;
struct vme_bridge *tsi148_bridge;
@@ -1312,7 +1358,42 @@ static ssize_t tsi148_master_write(struct vme_master_resource *image, void *buf,
spin_lock(&image->lock);
- memcpy_toio(image->kern_base + offset, buf, (unsigned int)count);
+ /* Here we apply for the same strategy we do in master_read
+ * function in order to assure D16 cycle when required.
+ */
+ if ((uintptr_t)addr & 0x1) {
+ iowrite8(*(u8 *)buf, addr);
+ done += 1;
+ if (done == count)
+ goto out;
+ }
+ if ((uintptr_t)addr & 0x2) {
+ if ((count - done) < 2) {
+ iowrite8(*(u8 *)(buf + done), addr + done);
+ done += 1;
+ goto out;
+ } else {
+ iowrite16(*(u16 *)(buf + done), addr + done);
+ done += 2;
+ }
+ }
+
+ count32 = (count - done) & ~0x3;
+ if (count32 > 0) {
+ memcpy_toio(addr + done, buf + done, count32);
+ done += count32;
+ }
+
+ if ((count - done) & 0x2) {
+ iowrite16(*(u16 *)(buf + done), addr + done);
+ done += 2;
+ }
+ if ((count - done) & 0x1) {
+ iowrite8(*(u8 *)(buf + done), addr + done);
+ done += 1;
+ }
+
+out:
retval = count;
/*