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if_dwc: Correctly configure the DMA engine based on the fdt properties

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Do not hardcode what we setup for the DMA engine configuration but
lookup the fdt properties and configuring accordingly.
Use a default value of 8 for the burst dma length for both TX and
RX, this is what we used for TX before.
This commit is contained in:
Emmanuel Vadot 2020-11-22 20:16:46 +00:00
parent 5321a88409
commit 5e38d9e483
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=367940
2 changed files with 21 additions and 6 deletions
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25
sys/dev/dwc/if_dwc.c
View File

@ -1496,6 +1496,9 @@ dwc_attach(device_t dev)
uint32_t reg;
char *phy_mode;
phandle_t node;
uint32_t txpbl, rxpbl;
bool nopblx8 = false;
bool fixed_burst = false;
sc = device_get_softc(dev);
sc->dev = dev;
@ -1513,6 +1516,15 @@ dwc_attach(device_t dev)
OF_prop_free(phy_mode);
}
if (OF_getencprop(node, "snps,txpbl", &txpbl, sizeof(uint32_t)) <= 0)
txpbl = 8;
if (OF_getencprop(node, "snps,rxpbl", &rxpbl, sizeof(uint32_t)) <= 0)
rxpbl = 8;
if (OF_hasprop(node, "snps,no-pbl-x8") == 1)
nopblx8 = true;
if (OF_hasprop(node, "snps,fixed-burst") == 1)
fixed_burst = true;
if (IF_DWC_INIT(dev) != 0)
return (ENXIO);
@ -1550,12 +1562,13 @@ dwc_attach(device_t dev)
return (ENXIO);
}
if (sc->mactype != DWC_GMAC_EXT_DESC) {
reg = BUS_MODE_FIXEDBURST;
reg |= (BUS_MODE_PRIORXTX_41 << BUS_MODE_PRIORXTX_SHIFT);
} else
reg = (BUS_MODE_EIGHTXPBL);
reg |= (BUS_MODE_PBL_BEATS_8 << BUS_MODE_PBL_SHIFT);
reg = BUS_MODE_USP;
if (!nopblx8)
reg |= BUS_MODE_EIGHTXPBL;
reg |= (txpbl << BUS_MODE_PBL_SHIFT);
reg |= (rxpbl << BUS_MODE_RPBL_SHIFT);
if (fixed_burst)
reg |= BUS_MODE_FIXEDBURST;
WRITE4(sc, BUS_MODE, reg);
/*

2
sys/dev/dwc/if_dwc.h
View File

@ -220,6 +220,8 @@
/* DMA */
#define BUS_MODE 0x1000
#define BUS_MODE_EIGHTXPBL (1 << 24) /* Multiplies PBL by 8 */
#define BUS_MODE_USP (1 << 23)
#define BUS_MODE_RPBL_SHIFT 17 /* Single block transfer size */
#define BUS_MODE_FIXEDBURST (1 << 16)
#define BUS_MODE_PRIORXTX_SHIFT 14
#define BUS_MODE_PRIORXTX_41 3