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Implement configurable descriptor size in ftgmac100 

The hardware supports configurable descriptor sizes, configured in the DBLAC
register.

Most drivers use the default 4 word descriptor, which is currently hardcoded,
but Aspeed SDK configures 8 words to store extra data.

Signed-off-by: Erik Smit <erik.lucas.smit@gmail.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
[PMM: removed unnecessary parens]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Erik Smit 2020-06-16 10:32:29 +01:00 committed by Peter Maydell
parent 3d26d7d690
commit d7a64d0063
1 changed files with 24 additions and 2 deletions
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26
hw/net/ftgmac100.c
View File

@ -79,6 +79,16 @@
#define FTGMAC100_APTC_TXPOLL_CNT(x) (((x) >> 8) & 0xf)
#define FTGMAC100_APTC_TXPOLL_TIME_SEL (1 << 12)
/*
* DMA burst length and arbitration control register
*/
#define FTGMAC100_DBLAC_RXBURST_SIZE(x) (((x) >> 8) & 0x3)
#define FTGMAC100_DBLAC_TXBURST_SIZE(x) (((x) >> 10) & 0x3)
#define FTGMAC100_DBLAC_RXDES_SIZE(x) ((((x) >> 12) & 0xf) * 8)
#define FTGMAC100_DBLAC_TXDES_SIZE(x) ((((x) >> 16) & 0xf) * 8)
#define FTGMAC100_DBLAC_IFG_CNT(x) (((x) >> 20) & 0x7)
#define FTGMAC100_DBLAC_IFG_INC (1 << 23)
/*
* PHY control register
*/
@ -553,7 +563,7 @@ static void ftgmac100_do_tx(FTGMAC100State *s, uint32_t tx_ring,
if (bd.des0 & s->txdes0_edotr) {
addr = tx_ring;
} else {
addr += sizeof(FTGMAC100Desc);
addr += FTGMAC100_DBLAC_TXDES_SIZE(s->dblac);
}
}
@ -800,6 +810,18 @@ static void ftgmac100_write(void *opaque, hwaddr addr,
s->phydata = value & 0xffff;
break;
case FTGMAC100_DBLAC: /* DMA Burst Length and Arbitration Control */
if (FTGMAC100_DBLAC_TXDES_SIZE(s->dblac) < sizeof(FTGMAC100Desc)) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: transmit descriptor too small : %d bytes\n",
__func__, FTGMAC100_DBLAC_TXDES_SIZE(s->dblac));
break;
}
if (FTGMAC100_DBLAC_RXDES_SIZE(s->dblac) < sizeof(FTGMAC100Desc)) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: receive descriptor too small : %d bytes\n",
__func__, FTGMAC100_DBLAC_RXDES_SIZE(s->dblac));
break;
}
s->dblac = value;
break;
case FTGMAC100_REVR: /* Feature Register */
@ -982,7 +1004,7 @@ static ssize_t ftgmac100_receive(NetClientState *nc, const uint8_t *buf,
if (bd.des0 & s->rxdes0_edorr) {
addr = s->rx_ring;
} else {
addr += sizeof(FTGMAC100Desc);
addr += FTGMAC100_DBLAC_RXDES_SIZE(s->dblac);
}
}
s->rx_descriptor = addr;