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net: sh-eth: Add control for padding size of packet descriptor 

sh-eth can change the alignment size of a packet descriptor according to BUS
size. This patch adds this function.

Signed-off-by: Hisashi Nakamura <hisashi.nakamura.ak@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
This commit is contained in:
Nobuhiro Iwamatsu 2013-08-22 13:22:02 +09:00 committed by Joe Hershberger
parent 870cc23f07
commit f8b7507d41
2 changed files with 30 additions and 10 deletions
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13
drivers/net/sh_eth.c
View File

@ -238,15 +238,17 @@ static int sh_eth_rx_desc_init(struct sh_eth_dev *eth)
* Allocate rx data buffers. They must be 32 bytes aligned and in
* P2 area
*/
port_info->rx_buf_malloc = malloc(NUM_RX_DESC * MAX_BUF_SIZE + 31);
port_info->rx_buf_malloc = malloc(
NUM_RX_DESC * MAX_BUF_SIZE + RX_BUF_ALIGNE_SIZE - 1);
if (!port_info->rx_buf_malloc) {
printf(SHETHER_NAME ": malloc failed\n");
ret = -ENOMEM;
goto err_buf_malloc;
}
tmp_addr = (u32)(((int)port_info->rx_buf_malloc + (32 - 1)) &
~(32 - 1));
tmp_addr = (u32)(((int)port_info->rx_buf_malloc
+ (RX_BUF_ALIGNE_SIZE - 1)) &
~(RX_BUF_ALIGNE_SIZE - 1));
port_info->rx_buf_base = (u8 *)ADDR_TO_P2(tmp_addr);
/* Initialize all descriptors */
@ -352,8 +354,9 @@ static int sh_eth_config(struct sh_eth_dev *eth, bd_t *bd)
struct phy_device *phy;
/* Configure e-dmac registers */
sh_eth_write(eth, (sh_eth_read(eth, EDMR) & ~EMDR_DESC_R) | EDMR_EL,
EDMR);
sh_eth_write(eth, (sh_eth_read(eth, EDMR) & ~EMDR_DESC_R) |
(EMDR_DESC | EDMR_EL), EDMR);
sh_eth_write(eth, 0, EESIPR);
sh_eth_write(eth, 0, TRSCER);
sh_eth_write(eth, 0, TFTR);

27
drivers/net/sh_eth.h
View File

@ -31,6 +31,11 @@
#define ADDR_TO_P2(addr) (addr)
#endif /* defined(CONFIG_SH) */
/* base padding size is 16 */
#ifndef CONFIG_SH_ETHER_ALIGNE_SIZE
#define CONFIG_SH_ETHER_ALIGNE_SIZE 16
#endif
/* Number of supported ports */
#define MAX_PORT_NUM 2
@ -45,15 +50,16 @@
/* The size of the tx descriptor is determined by how much padding is used.
4, 20, or 52 bytes of padding can be used */
#define TX_DESC_PADDING 4
#define TX_DESC_SIZE (12 + TX_DESC_PADDING)
#define TX_DESC_PADDING (CONFIG_SH_ETHER_ALIGNE_SIZE - 12)
/* same as CONFIG_SH_ETHER_ALIGNE_SIZE */
#define TX_DESC_SIZE (12 + TX_DESC_PADDING)
/* Tx descriptor. We always use 3 bytes of padding */
struct tx_desc_s {
volatile u32 td0;
u32 td1;
u32 td2; /* Buffer start */
u32 padding;
u8 padding[TX_DESC_PADDING]; /* aligned cache line size */
};
/* There is no limitation in the number of rx descriptors */
@ -61,15 +67,18 @@ struct tx_desc_s {
/* The size of the rx descriptor is determined by how much padding is used.
4, 20, or 52 bytes of padding can be used */
#define RX_DESC_PADDING 4
#define RX_DESC_PADDING (CONFIG_SH_ETHER_ALIGNE_SIZE - 12)
/* same as CONFIG_SH_ETHER_ALIGNE_SIZE */
#define RX_DESC_SIZE (12 + RX_DESC_PADDING)
/* aligned cache line size */
#define RX_BUF_ALIGNE_SIZE (CONFIG_SH_ETHER_ALIGNE_SIZE > 32 ? 64 : 32)
/* Rx descriptor. We always use 4 bytes of padding */
struct rx_desc_s {
volatile u32 rd0;
volatile u32 rd1;
u32 rd2; /* Buffer start */
u32 padding;
u8 padding[TX_DESC_PADDING]; /* aligned cache line size */
};
struct sh_eth_info {
@ -320,6 +329,14 @@ enum DMAC_M_BIT {
#endif
};
#if CONFIG_SH_ETHER_ALIGNE_SIZE == 64
# define EMDR_DESC EDMR_DL1
#elif CONFIG_SH_ETHER_ALIGNE_SIZE == 32
# define EMDR_DESC EDMR_DL0
#elif CONFIG_SH_ETHER_ALIGNE_SIZE == 16 /* Default */
# define EMDR_DESC 0
#endif
/* RFLR */
#define RFLR_RFL_MIN 0x05EE /* Recv Frame length 1518 byte */