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authorDavid Sterba <dsterba@suse.cz>2008-07-28 16:53:00 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-28 08:28:03 -0700
commitd54c2752f6bb6cc53359dcdf6ed4fb6e5fb6440a (patch)
treefa0eb045b7387aaa57741f7068cce2f22788b6ac /drivers
parent622e713e8e207a99aad956bf0ebe435420fb3742 (diff)
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ipwireless: Remove endian-dependent bitfields
ipwireless: Remove endian-dependent bitfields Remove endian-dependent bitfields and use bitmasks to transform packet header bitfields from/to machine order. Signed-off-by: David Sterba <dsterba@suse.cz> Signed-off-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/char/pcmcia/ipwireless/hardware.c51
1 files changed, 38 insertions, 13 deletions
diff --git a/drivers/char/pcmcia/ipwireless/hardware.c b/drivers/char/pcmcia/ipwireless/hardware.c
index 7428734d08a1..08423ba5b9dd 100644
--- a/drivers/char/pcmcia/ipwireless/hardware.c
+++ b/drivers/char/pcmcia/ipwireless/hardware.c
@@ -132,29 +132,17 @@ enum {
#define NL_FOLLOWING_PACKET_HEADER_SIZE 1
struct nl_first_packet_header {
-#if defined(__BIG_ENDIAN_BITFIELD)
- unsigned char packet_rank:2;
- unsigned char address:3;
- unsigned char protocol:3;
-#else
unsigned char protocol:3;
unsigned char address:3;
unsigned char packet_rank:2;
-#endif
unsigned char length_lsb;
unsigned char length_msb;
};
struct nl_packet_header {
-#if defined(__BIG_ENDIAN_BITFIELD)
- unsigned char packet_rank:2;
- unsigned char address:3;
- unsigned char protocol:3;
-#else
unsigned char protocol:3;
unsigned char address:3;
unsigned char packet_rank:2;
-#endif
};
/* Value of 'packet_rank' above */
@@ -382,7 +370,37 @@ static void dump_data_bytes(const char *type, const unsigned char *data,
length < DUMP_MAX_BYTES ? length : DUMP_MAX_BYTES);
}
-static int do_send_fragment(struct ipw_hardware *hw, const unsigned char *data,
+static void swap_packet_bitfield_to_le(unsigned char *data)
+{
+#ifdef __BIG_ENDIAN_BITFIELD
+ unsigned char tmp = *data, ret = 0;
+
+ /*
+ * transform bits from aa.bbb.ccc to ccc.bbb.aa
+ */
+ ret |= tmp & 0xc0 >> 6;
+ ret |= tmp & 0x38 >> 1;
+ ret |= tmp & 0x07 << 5;
+ *data = ret & 0xff;
+#endif
+}
+
+static void swap_packet_bitfield_from_le(unsigned char *data)
+{
+#ifdef __BIG_ENDIAN_BITFIELD
+ unsigned char tmp = *data, ret = 0;
+
+ /*
+ * transform bits from ccc.bbb.aa to aa.bbb.ccc
+ */
+ ret |= tmp & 0xe0 >> 5;
+ ret |= tmp & 0x1c << 1;
+ ret |= tmp & 0x03 << 6;
+ *data = ret & 0xff;
+#endif
+}
+
+static int do_send_fragment(struct ipw_hardware *hw, unsigned char *data,
unsigned length)
{
unsigned i;
@@ -402,6 +420,7 @@ static int do_send_fragment(struct ipw_hardware *hw, const unsigned char *data,
spin_lock_irqsave(&hw->lock, flags);
hw->tx_ready = 0;
+ swap_packet_bitfield_to_le(data);
if (hw->hw_version == HW_VERSION_1) {
outw((unsigned short) length, hw->base_port + IODWR);
@@ -458,6 +477,10 @@ static int do_send_packet(struct ipw_hardware *hw, struct ipw_tx_packet *packet)
if (data_left < fragment_data_len)
fragment_data_len = data_left;
+ /*
+ * hdr_first is now in machine bitfield order, which will be swapped
+ * to le just before it goes to hw
+ */
pkt.hdr_first.protocol = packet->protocol;
pkt.hdr_first.address = packet->dest_addr;
pkt.hdr_first.packet_rank = 0;
@@ -883,6 +906,8 @@ static void do_receive_packet(struct ipw_hardware *hw)
acknowledge_data_read(hw);
+ swap_packet_bitfield_from_le(pkt);
+
if (ipwireless_debug)
dump_data_bytes("recv", pkt, len);