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Subject[PATCH v2 1/6] net/macb: configure for FIFO mode and non-gigabit
Date
From: Nicolas Ferre <nicolas.ferre@atmel.com>

This addition will also allow to configure DMA burst length.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
---
drivers/net/ethernet/cadence/macb.c | 75 ++++++++++++++++++++++++++++---------
drivers/net/ethernet/cadence/macb.h | 19 +++++++++-
2 files changed, 74 insertions(+), 20 deletions(-)

diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
index e9daa07..91870e9 100644
--- a/drivers/net/ethernet/cadence/macb.c
+++ b/drivers/net/ethernet/cadence/macb.c
@@ -264,7 +264,8 @@ static void macb_handle_link_change(struct net_device *dev)
reg |= MACB_BIT(FD);
if (phydev->speed == SPEED_100)
reg |= MACB_BIT(SPD);
- if (phydev->speed == SPEED_1000)
+ if (phydev->speed == SPEED_1000 &&
+ bp->caps & MACB_CAPS_GIGABIT_MODE_AVAILABLE)
reg |= GEM_BIT(GBE);

macb_or_gem_writel(bp, NCFGR, reg);
@@ -337,7 +338,7 @@ static int macb_mii_probe(struct net_device *dev)
}

/* mask with MAC supported features */
- if (macb_is_gem(bp))
+ if (macb_is_gem(bp) && bp->caps & MACB_CAPS_GIGABIT_MODE_AVAILABLE)
phydev->supported &= PHY_GBIT_FEATURES;
else
phydev->supported &= PHY_BASIC_FEATURES;
@@ -1342,7 +1343,7 @@ static u32 macb_dbw(struct macb *bp)
/*
* Configure the receive DMA engine
* - use the correct receive buffer size
- * - set the possibility to use INCR16 bursts
+ * - set best burst length for DMA operations
* (if not supported by FIFO, it will fallback to default)
* - set both rx/tx packet buffers to full memory size
* These are configurable parameters for GEM.
@@ -1354,24 +1355,16 @@ static void macb_configure_dma(struct macb *bp)
if (macb_is_gem(bp)) {
dmacfg = gem_readl(bp, DMACFG) & ~GEM_BF(RXBS, -1L);
dmacfg |= GEM_BF(RXBS, bp->rx_buffer_size / RX_BUFFER_MULTIPLE);
- dmacfg |= GEM_BF(FBLDO, 16);
+ if (bp->dma_burst_length)
+ dmacfg = GEM_BFINS(FBLDO, bp->dma_burst_length, dmacfg);
dmacfg |= GEM_BIT(TXPBMS) | GEM_BF(RXBMS, -1L);
dmacfg &= ~GEM_BIT(ENDIA);
+ netdev_dbg(bp->dev, "Cadence configure DMA with 0x%08x\n",
+ dmacfg);
gem_writel(bp, DMACFG, dmacfg);
}
}

-/*
- * Configure peripheral capacities according to integration options used
- */
-static void macb_configure_caps(struct macb *bp)
-{
- if (macb_is_gem(bp)) {
- if (GEM_BFEXT(IRQCOR, gem_readl(bp, DCFG1)) == 0)
- bp->caps |= MACB_CAPS_ISR_CLEAR_ON_WRITE;
- }
-}
-
static void macb_init_hw(struct macb *bp)
{
u32 config;
@@ -1394,7 +1387,6 @@ static void macb_init_hw(struct macb *bp)
bp->duplex = DUPLEX_HALF;

macb_configure_dma(bp);
- macb_configure_caps(bp);

/* Initialize TX and RX buffers */
macb_writel(bp, RBQP, bp->rx_ring_dma);
@@ -1783,17 +1775,61 @@ static const struct net_device_ops macb_netdev_ops = {
};

#if defined(CONFIG_OF)
+static struct macb_config pc302gem_config = {
+ .caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE,
+ .dma_burst_length = 16,
+};
+
static const struct of_device_id macb_dt_ids[] = {
{ .compatible = "cdns,at32ap7000-macb" },
{ .compatible = "cdns,at91sam9260-macb" },
{ .compatible = "cdns,macb" },
- { .compatible = "cdns,pc302-gem" },
- { .compatible = "cdns,gem" },
+ { .compatible = "cdns,pc302-gem", .data = &pc302gem_config },
+ { .compatible = "cdns,gem", .data = &pc302gem_config },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, macb_dt_ids);
#endif

+/*
+ * Configure peripheral capacities according to device tree
+ * and integration options used
+ */
+static void macb_configure_caps(struct macb *bp)
+{
+ u32 dcfg;
+ const struct of_device_id *match;
+ const struct macb_config *config;
+
+ if (bp->pdev->dev.of_node) {
+ match = of_match_node(macb_dt_ids, bp->pdev->dev.of_node);
+ if (match && match->data) {
+ config = (const struct macb_config *)match->data;
+
+ bp->caps = config->caps;
+ /*
+ * As we have access to the matching node, configure
+ * DMA burst length as well
+ */
+ bp->dma_burst_length = config->dma_burst_length;
+ }
+ }
+
+ if (MACB_BFEXT(IDNUM, macb_readl(bp, MID)) == 0x2)
+ bp->caps |= MACB_CAPS_MACB_IS_GEM;
+
+ if (macb_is_gem(bp)) {
+ dcfg = gem_readl(bp, DCFG1);
+ if (GEM_BFEXT(IRQCOR, dcfg) == 0)
+ bp->caps |= MACB_CAPS_ISR_CLEAR_ON_WRITE;
+ dcfg = gem_readl(bp, DCFG2);
+ if ((dcfg & (GEM_BIT(RX_PKT_BUFF) | GEM_BIT(TX_PKT_BUFF))) == 0)
+ bp->caps |= MACB_CAPS_FIFO_MODE;
+ }
+
+ netdev_dbg(bp->dev, "Cadence caps 0x%08x\n", bp->caps);
+}
+
static int __init macb_probe(struct platform_device *pdev)
{
struct macb_platform_data *pdata;
@@ -1897,6 +1933,9 @@ static int __init macb_probe(struct platform_device *pdev)

dev->base_addr = regs->start;

+ /* setup capacities */
+ macb_configure_caps(bp);
+
/* setup appropriated routines according to adapter type */
if (macb_is_gem(bp)) {
bp->macbgem_ops.mog_alloc_rx_buffers = gem_alloc_rx_buffers;
diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h
index 51c0244..7ce751b 100644
--- a/drivers/net/ethernet/cadence/macb.h
+++ b/drivers/net/ethernet/cadence/macb.h
@@ -305,6 +305,12 @@
#define GEM_DBWDEF_OFFSET 25
#define GEM_DBWDEF_SIZE 3

+/* Bitfields in DCFG2. */
+#define GEM_RX_PKT_BUFF_OFFSET 20
+#define GEM_RX_PKT_BUFF_SIZE 1
+#define GEM_TX_PKT_BUFF_OFFSET 21
+#define GEM_TX_PKT_BUFF_SIZE 1
+
/* Constants for CLK */
#define MACB_CLK_DIV8 0
#define MACB_CLK_DIV16 1
@@ -326,7 +332,10 @@
#define MACB_MAN_CODE 2

/* Capability mask bits */
-#define MACB_CAPS_ISR_CLEAR_ON_WRITE 0x1
+#define MACB_CAPS_ISR_CLEAR_ON_WRITE 0x00000001
+#define MACB_CAPS_FIFO_MODE 0x10000000
+#define MACB_CAPS_GIGABIT_MODE_AVAILABLE 0x20000000
+#define MACB_CAPS_MACB_IS_GEM 0x80000000

/* Bit manipulation macros */
#define MACB_BIT(name) \
@@ -554,6 +563,11 @@ struct macb_or_gem_ops {
int (*mog_rx)(struct macb *bp, int budget);
};

+struct macb_config {
+ u32 caps;
+ unsigned int dma_burst_length;
+};
+
struct macb {
void __iomem *regs;

@@ -595,6 +609,7 @@ struct macb {
unsigned int duplex;

u32 caps;
+ unsigned int dma_burst_length;

phy_interface_t phy_interface;

@@ -615,7 +630,7 @@ void macb_get_hwaddr(struct macb *bp);

static inline bool macb_is_gem(struct macb *bp)
{
- return MACB_BFEXT(IDNUM, macb_readl(bp, MID)) == 0x2;
+ return !!(bp->caps & MACB_CAPS_MACB_IS_GEM);
}

#endif /* _MACB_H */
--
1.8.2.2


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