diff options
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/dev/phy/et131x.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/sys/dev/phy/et131x.c b/sys/dev/phy/et131x.c index bc5a732..d7764ae 100644 --- a/sys/dev/phy/et131x.c +++ b/sys/dev/phy/et131x.c @@ -51,9 +51,22 @@ #define pr_trace(fmt, ...) kprintf("et131x: " fmt, ##__VA_ARGS__) #define pr_error(...) pr_trace(__VA_ARGS__) +/* + * The ET131X has 1024 words of internal RAM used to + * store/buffer packet data before reception or transmission. + * The card allows us to decide how large the TX/RX buffers would + * be split up. We split the RX/TX 50/50 as a nice balanced default. + * Might need to later adjust based on various system needs + * (e.g., heavy TX or RX) to avoid thrashing any of the buffers. + * + */ +#define INTERNAL_MEMSIZE 1024 /* In words */ +#define INTERNAL_MEM_RXOFF 0x1FF /* 50/50 split */ + /* Helpful constants */ #define ETHERFRAME_LEN 1518 /* Length of ethernet frame */ #define ETHER_FCS_LEN 4 /* Length of frame check seq */ +#define RX_MEM_END 0x2BC struct netcard { struct et131x_iospace *io; @@ -206,6 +219,7 @@ et131x_mac_init(struct netcard *card) { struct et131x_iospace *io = card->io; struct mac_regs *mac = &io->mac; + struct global_regs *global = &io->global; struct netif_addr addr; uint32_t ipg_tmp, tmp; @@ -228,6 +242,16 @@ et131x_mac_init(struct netcard *card) mmio_write32(&mac->if_ctrl, 0); mmio_write32(&mac->mii_mgmt_cfg, MAC_MIIMGMT_CLK_RST); + /* + * Split the RX/TX memory 50/50, put the internal RX + * buffer right at the start into the first half, and + * the TX buffer right after the RX buffer. + */ + mmio_write32(&global->rxq_start, 0); + mmio_write32(&global->rxq_end, RX_MEM_END); + mmio_write32(&global->txq_start, RX_MEM_END + 1); + mmio_write32(&global->txq_end, INTERNAL_MEMSIZE - 1); + /* Disable loopbacks, watchdog timer, clear MSI config */ mmio_write32(&global->loopback, 0); mmio_write32(&global->msi_config, 0); |