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authorMichael Hennerich <michael.hennerich@analog.com>2007-11-17 10:46:58 -0500
committerBryan Wu <bryan.wu@analog.com>2007-11-17 10:46:58 -0500
commit5c91fb902d4e6f6006faf45edd3f25932cb7d58c (patch)
tree0bdf4457456a6bc8f794078e22a885dc44b2d159 /arch/blackfin/lib
parent1754a5d9f97f16f729066b8f125351af4951d6fe (diff)
Blackfin arch: Add assembly function insl_16
/* * CPUs often take a performance hit when accessing unaligned memory * locations. The actual performance hit varies, it can be small if the * hardware handles it or large if we have to take an exception and fix * it * in software. * * Since an ethernet header is 14 bytes network drivers often end up * with * the IP header at an unaligned offset. The IP header can be aligned by * shifting the start of the packet by 2 bytes. Drivers should do this * with: * * skb_reserve(NET_IP_ALIGN); * * The downside to this alignment of the IP header is that the DMA is * now * unaligned. On some architectures the cost of an unaligned DMA is high * and this cost outweighs the gains made by aligning the IP header. * * Since this trade off varies between architectures, we allow * NET_IP_ALIGN * to be overridden. */ This new function insl_16 allows to read form 32-bit IO and writes to 16-bit aligned memory. This is useful in above described scenario - In particular with the AXIS AX88180 Gigabit Ethernet MAC. Once the device is in 32-bit mode, reads from the RX FIFO always decrements 4bytes. While on the other side the destination address in SDRAM is always 16-bit aligned. If we use skb_reserve(0) the receive buffer is 32-bit aligned but later we hit a unaligned exception in the IP code. Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Diffstat (limited to 'arch/blackfin/lib')
-rw-r--r--arch/blackfin/lib/ins.S19
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/blackfin/lib/ins.S b/arch/blackfin/lib/ins.S
index a17cc77ac36f..df7b8833a0c5 100644
--- a/arch/blackfin/lib/ins.S
+++ b/arch/blackfin/lib/ins.S
@@ -77,3 +77,22 @@ ENTRY(_insb)
77 sti R3; 77 sti R3;
78 RTS; 78 RTS;
79ENDPROC(_insb) 79ENDPROC(_insb)
80
81
82
83ENTRY(_insl_16)
84 P0 = R0; /* P0 = port */
85 cli R3;
86 P1 = R1; /* P1 = address */
87 P2 = R2; /* P2 = count */
88 SSYNC;
89 LSETUP( .Llong16_loop_s, .Llong16_loop_e) LC0 = P2;
90.Llong16_loop_s: R0 = [P0];
91 W[P1++] = R0;
92 R0 = R0 >> 16;
93 W[P1++] = R0;
94 NOP;
95.Llong16_loop_e: NOP;
96 sti R3;
97 RTS;
98ENDPROC(_insl_16)