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| author | Risto Suominen <risto.suominen@gmail.com> | 2009-06-10 09:55:00 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-06-11 02:32:41 -0700 |
| commit | b77e5228849fdcd7a5d73beb16b9ad99395236ec (patch) | |
| tree | 3a5bc41d328882fab6fd6e2f48fd72f6bda3b308 /drivers/net/tulip | |
| parent | ef5c89967d50042b29937fb724e057c1aa3c5207 (diff) | |
| download | linux-b77e5228849fdcd7a5d73beb16b9ad99395236ec.tar.gz | |
de2104x: support for systems lacking cache coherence
Add a configurable Descriptor Skip Length for systems that lack cache coherence. (akpm: I think this should be done as a module parameter, not a compile-tinme option) Signed-off-by: Risto Suominen <Risto.Suominen@gmail.com> Cc: Grant Grundler <grundler@parisc-linux.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/tulip')
| -rw-r--r-- | drivers/net/tulip/Kconfig | 12 | ||||
| -rw-r--r-- | drivers/net/tulip/de2104x.c | 13 |
2 files changed, 24 insertions, 1 deletions
diff --git a/drivers/net/tulip/Kconfig b/drivers/net/tulip/Kconfig index d913405bc393..1cc8cf4425d1 100644 --- a/drivers/net/tulip/Kconfig +++ b/drivers/net/tulip/Kconfig @@ -27,6 +27,18 @@ config DE2104X To compile this driver as a module, choose M here. The module will be called de2104x. +config DE2104X_DSL + int "Descriptor Skip Length in 32 bit longwords" + depends on DE2104X + range 0 31 + default 0 + help + Setting this value allows to align ring buffer descriptors into their + own cache lines. Value of 4 corresponds to the typical 32 byte line + (the descriptor is 16 bytes). This is necessary on systems that lack + cache coherence, an example is PowerMac 5500. Otherwise 0 is safe. + Default is 0, and range is 0 to 31. + config TULIP tristate "DECchip Tulip (dc2114x) PCI support" depends on PCI diff --git a/drivers/net/tulip/de2104x.c b/drivers/net/tulip/de2104x.c index d4c5ecc51f77..e7609a05032d 100644 --- a/drivers/net/tulip/de2104x.c +++ b/drivers/net/tulip/de2104x.c @@ -82,6 +82,13 @@ MODULE_PARM_DESC (rx_copybreak, "de2104x Breakpoint at which Rx packets are copi NETIF_MSG_RX_ERR | \ NETIF_MSG_TX_ERR) +/* Descriptor skip length in 32 bit longwords. */ +#ifndef CONFIG_DE2104X_DSL +#define DSL 0 +#else +#define DSL CONFIG_DE2104X_DSL +#endif + #define DE_RX_RING_SIZE 64 #define DE_TX_RING_SIZE 64 #define DE_RING_BYTES \ @@ -153,6 +160,7 @@ enum { CmdReset = (1 << 0), CacheAlign16 = 0x00008000, BurstLen4 = 0x00000400, + DescSkipLen = (DSL << 2), /* Rx/TxPoll bits */ NormalTxPoll = (1 << 0), @@ -246,7 +254,7 @@ static const u32 de_intr_mask = * Set the programmable burst length to 4 longwords for all: * DMA errors result without these values. Cache align 16 long. */ -static const u32 de_bus_mode = CacheAlign16 | BurstLen4; +static const u32 de_bus_mode = CacheAlign16 | BurstLen4 | DescSkipLen; struct de_srom_media_block { u8 opts; @@ -266,6 +274,9 @@ struct de_desc { __le32 opts2; __le32 addr1; __le32 addr2; +#if DSL + __le32 skip[DSL]; +#endif }; struct media_info { |