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ibm_newemac: Introduce mal_has_feature

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There are some PowerPC SoCs that do odd things with the MAL handling.  In
order to accommodate them, we need to introduce a feature mechanism that is
similar to the existing emac_has_feature function.

This adds a feature variable to the mal_instance structure, and adds a
mal_has_feature function.  Two features are defined and are guarded
by Kconfig options that are selected by the affected platforms.

MAL_FTR_CLEAR_ICINSTAT is used for platforms that need to clear the
interrupt bits in the ICINTSTAT SDR for txeob/rxeob.  This is common
on MAL implementations that have interrupt coalescing.

MAL_FTR_COMMON_ERR_INT is used for platforms that have SERR, TXDE,
and RXDE OR'd into a single interrupt bit.

Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
This commit is contained in:
Josh Boyer 2008-09-04 04:03:45 +00:00
parent b68d185ab1
commit ec4f9945b5
2 changed files with 42 additions and 0 deletions
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8
drivers/net/ibm_newemac/Kconfig
View file

@ -66,3 +66,11 @@ config IBM_NEW_EMAC_EMAC4
config IBM_NEW_EMAC_NO_FLOW_CTRL
bool
default n
config IBM_NEW_EMAC_MAL_CLR_ICINTSTAT
bool
default n
config IBM_NEW_EMAC_MAL_COMMON_ERR
bool
default n

34
drivers/net/ibm_newemac/mal.h
View file

@ -213,6 +213,8 @@ struct mal_instance {
struct of_device *ofdev;
int index;
spinlock_t lock;
unsigned int features;
};
static inline u32 get_mal_dcrn(struct mal_instance *mal, int reg)
@ -225,6 +227,38 @@ static inline void set_mal_dcrn(struct mal_instance *mal, int reg, u32 val)
dcr_write(mal->dcr_host, reg, val);
}
/* Features of various MAL implementations */
/* Set if you have interrupt coalescing and you have to clear the SDR
* register for TXEOB and RXEOB interrupts to work
*/
#define MAL_FTR_CLEAR_ICINTSTAT 0x00000001
/* Set if your MAL has SERR, TXDE, and RXDE OR'd into a single UIC
* interrupt
*/
#define MAL_FTR_COMMON_ERR_INT 0x00000002
enum {
MAL_FTRS_ALWAYS = 0,
MAL_FTRS_POSSIBLE =
#ifdef CONFIG_IBM_NEW_EMAC_MAL_CLR_ICINTSTAT
MAL_FTR_CLEAR_ICINTSTAT |
#endif
#ifdef CONFIG_IBM_NEW_EMAC_MAL_COMMON_ERR
MAL_FTR_COMMON_ERR_INT |
#endif
0,
};
static inline int mal_has_feature(struct mal_instance *dev,
unsigned long feature)
{
return (MAL_FTRS_ALWAYS & feature) ||
(MAL_FTRS_POSSIBLE & dev->features & feature);
}
/* Register MAL devices */
int mal_init(void);
void mal_exit(void);