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net: mvneta: support big endian

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Use the "swap descriptor" feature of the hardware to properly swap the
descriptors when running in big endian mode. Since the swapping occurs
on 64 bits words, we also need to provide a separate structure layout
for the DMA descriptors between little endian and big endian mode,
like is done in the mv643xx_eth driver.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Petazzoni 2013-07-29 15:21:28 +02:00 committed by David S. Miller
parent 6083ed448b
commit 9ad8fef6c6
1 changed files with 32 additions and 3 deletions
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35
drivers/net/ethernet/marvell/mvneta.c
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@ -79,10 +79,10 @@
#define MVNETA_MAC_ADDR_HIGH 0x2418
#define MVNETA_SDMA_CONFIG 0x241c
#define MVNETA_SDMA_BRST_SIZE_16 4
#define MVNETA_NO_DESC_SWAP 0x0
#define MVNETA_RX_BRST_SZ_MASK(burst) ((burst) << 1)
#define MVNETA_RX_NO_DATA_SWAP BIT(4)
#define MVNETA_TX_NO_DATA_SWAP BIT(5)
#define MVNETA_DESC_SWAP BIT(6)
#define MVNETA_TX_BRST_SZ_MASK(burst) ((burst) << 22)
#define MVNETA_PORT_STATUS 0x2444
#define MVNETA_TX_IN_PRGRS BIT(1)
@ -287,6 +287,7 @@ struct mvneta_port {
#define MVNETA_RXD_FIRST_LAST_DESC (BIT(26) | BIT(27))
#define MVNETA_RXD_L4_CSUM_OK BIT(30)
#if defined(__LITTLE_ENDIAN)
struct mvneta_tx_desc {
u32 command; /* Options used by HW for packet transmitting.*/
u16 reserverd1; /* csum_l4 (for future use) */
@ -311,6 +312,32 @@ struct mvneta_rx_desc {
u32 reserved5; /* pnc_extra PnC (for future use, PnC) */
u32 reserved6; /* hw_cmd (for future use, PnC and HWF) */
};
#else
struct mvneta_tx_desc {
u16 data_size; /* Data size of transmitted packet in bytes */
u16 reserverd1; /* csum_l4 (for future use) */
u32 command; /* Options used by HW for packet transmitting.*/
u32 reserved2; /* hw_cmd - (for future use, PMT) */
u32 buf_phys_addr; /* Physical addr of transmitted buffer */
u32 reserved3[4]; /* Reserved - (for future use) */
};
struct mvneta_rx_desc {
u16 data_size; /* Size of received packet in bytes */
u16 reserved1; /* pnc_info - (for future use, PnC) */
u32 status; /* Info about received packet */
u32 reserved2; /* pnc_flow_id (for future use, PnC) */
u32 buf_phys_addr; /* Physical address of the buffer */
u16 reserved4; /* csum_l4 - (for future use, PnC) */
u16 reserved3; /* prefetch_cmd, for future use */
u32 buf_cookie; /* cookie for access to RX buffer in rx path */
u32 reserved5; /* pnc_extra PnC (for future use, PnC) */
u32 reserved6; /* hw_cmd (for future use, PnC and HWF) */
};
#endif
struct mvneta_tx_queue {
/* Number of this TX queue, in the range 0-7 */
@ -908,9 +935,11 @@ static void mvneta_defaults_set(struct mvneta_port *pp)
/* Default burst size */
val |= MVNETA_TX_BRST_SZ_MASK(MVNETA_SDMA_BRST_SIZE_16);
val |= MVNETA_RX_BRST_SZ_MASK(MVNETA_SDMA_BRST_SIZE_16);
val |= MVNETA_RX_NO_DATA_SWAP | MVNETA_TX_NO_DATA_SWAP;
val |= (MVNETA_RX_NO_DATA_SWAP | MVNETA_TX_NO_DATA_SWAP |
MVNETA_NO_DESC_SWAP);
#if defined(__BIG_ENDIAN)
val |= MVNETA_DESC_SWAP;
#endif
/* Assign port SDMA configuration */
mvreg_write(pp, MVNETA_SDMA_CONFIG, val);