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bcm63xx_enet: split DMA channel register accesses 

The current bcm63xx_enet driver always uses bcmenet_shared_base whenever
it needs to access DMA channel configuration space or access the DMA
channel state RAM. Split these register in 3 parts to be more accurate:

- global DMA configuration
- per DMA channel configuration space
- per DMA channel state RAM space

This is preliminary to support new chips where the global DMA
configuration remains the same, but there is a varying number of DMA
channels located at a different memory offset.

Signed-off-by: Maxime Bizon <mbizon@freebox.fr>
Signed-off-by: Jonas Gorski <jogo@openwrt.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Maxime Bizon 2013-06-04 22:53:34 +01:00 committed by David S. Miller
parent 7260aac974
commit 0ae99b5fed
3 changed files with 105 additions and 61 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
arch/mips/bcm63xx/dev-enet.c
View File

@ -19,6 +19,16 @@ static struct resource shared_res[] = {
.end = -1, /* filled at runtime */
.flags = IORESOURCE_MEM,
},
{
.start = -1, /* filled at runtime */
.end = -1, /* filled at runtime */
.flags = IORESOURCE_MEM,
},
{
.start = -1, /* filled at runtime */
.end = -1, /* filled at runtime */
.flags = IORESOURCE_MEM,
},
};
static struct platform_device bcm63xx_enet_shared_device = {
@ -110,10 +120,15 @@ int __init bcm63xx_enet_register(int unit,
if (!shared_device_registered) {
shared_res[0].start = bcm63xx_regset_address(RSET_ENETDMA);
shared_res[0].end = shared_res[0].start;
if (BCMCPU_IS_6338())
shared_res[0].end += (RSET_ENETDMA_SIZE / 2) - 1;
else
shared_res[0].end += (RSET_ENETDMA_SIZE) - 1;
shared_res[0].end += (RSET_ENETDMA_SIZE) - 1;
shared_res[1].start = bcm63xx_regset_address(RSET_ENETDMAC);
shared_res[1].end = shared_res[1].start;
shared_res[1].end += RSET_ENETDMAC_SIZE(16) - 1;
shared_res[2].start = bcm63xx_regset_address(RSET_ENETDMAS);
shared_res[2].end = shared_res[2].start;
shared_res[2].end += RSET_ENETDMAS_SIZE(16) - 1;
ret = platform_device_register(&bcm63xx_enet_shared_device);
if (ret)

4
arch/mips/include/asm/mach-bcm63xx/bcm63xx_cpu.h
View File

@ -173,7 +173,9 @@ enum bcm63xx_regs_set {
#define BCM_6358_RSET_SPI_SIZE 1804
#define BCM_6368_RSET_SPI_SIZE 1804
#define RSET_ENET_SIZE 2048
#define RSET_ENETDMA_SIZE 2048
#define RSET_ENETDMA_SIZE 256
#define RSET_ENETDMAC_SIZE(chans) (16 * (chans))
#define RSET_ENETDMAS_SIZE(chans) (16 * (chans))
#define RSET_ENETSW_SIZE 65536
#define RSET_UART_SIZE 24
#define RSET_UDC_SIZE 256

139
drivers/net/ethernet/broadcom/bcm63xx_enet.c
View File

@ -41,8 +41,8 @@ static int copybreak __read_mostly = 128;
module_param(copybreak, int, 0);
MODULE_PARM_DESC(copybreak, "Receive copy threshold");
/* io memory shared between all devices */
static void __iomem *bcm_enet_shared_base;
/* io registers memory shared between all devices */
static void __iomem *bcm_enet_shared_base[3];
/*
* io helpers to access mac registers
@ -63,13 +63,35 @@ static inline void enet_writel(struct bcm_enet_priv *priv,
*/
static inline u32 enet_dma_readl(struct bcm_enet_priv *priv, u32 off)
{
return bcm_readl(bcm_enet_shared_base + off);
return bcm_readl(bcm_enet_shared_base[0] + off);
}
static inline void enet_dma_writel(struct bcm_enet_priv *priv,
u32 val, u32 off)
{
bcm_writel(val, bcm_enet_shared_base + off);
bcm_writel(val, bcm_enet_shared_base[0] + off);
}
static inline u32 enet_dmac_readl(struct bcm_enet_priv *priv, u32 off)
{
return bcm_readl(bcm_enet_shared_base[1] + off);
}
static inline void enet_dmac_writel(struct bcm_enet_priv *priv,
u32 val, u32 off)
{
bcm_writel(val, bcm_enet_shared_base[1] + off);
}
static inline u32 enet_dmas_readl(struct bcm_enet_priv *priv, u32 off)
{
return bcm_readl(bcm_enet_shared_base[2] + off);
}
static inline void enet_dmas_writel(struct bcm_enet_priv *priv,
u32 val, u32 off)
{
bcm_writel(val, bcm_enet_shared_base[2] + off);
}
/*
@ -353,8 +375,8 @@ static int bcm_enet_receive_queue(struct net_device *dev, int budget)
bcm_enet_refill_rx(dev);
/* kick rx dma */
enet_dma_writel(priv, ENETDMA_CHANCFG_EN_MASK,
ENETDMA_CHANCFG_REG(priv->rx_chan));
enet_dmac_writel(priv, ENETDMAC_CHANCFG_EN_MASK,
ENETDMAC_CHANCFG_REG(priv->rx_chan));
}
return processed;
@ -429,10 +451,10 @@ static int bcm_enet_poll(struct napi_struct *napi, int budget)
dev = priv->net_dev;
/* ack interrupts */
enet_dma_writel(priv, ENETDMA_IR_PKTDONE_MASK,
ENETDMA_IR_REG(priv->rx_chan));
enet_dma_writel(priv, ENETDMA_IR_PKTDONE_MASK,
ENETDMA_IR_REG(priv->tx_chan));
enet_dmac_writel(priv, ENETDMAC_IR_PKTDONE_MASK,
ENETDMAC_IR_REG(priv->rx_chan));
enet_dmac_writel(priv, ENETDMAC_IR_PKTDONE_MASK,
ENETDMAC_IR_REG(priv->tx_chan));
/* reclaim sent skb */
tx_work_done = bcm_enet_tx_reclaim(dev, 0);
@ -451,10 +473,10 @@ static int bcm_enet_poll(struct napi_struct *napi, int budget)
napi_complete(napi);
/* restore rx/tx interrupt */
enet_dma_writel(priv, ENETDMA_IR_PKTDONE_MASK,
ENETDMA_IRMASK_REG(priv->rx_chan));
enet_dma_writel(priv, ENETDMA_IR_PKTDONE_MASK,
ENETDMA_IRMASK_REG(priv->tx_chan));
enet_dmac_writel(priv, ENETDMAC_IR_PKTDONE_MASK,
ENETDMAC_IRMASK_REG(priv->rx_chan));
enet_dmac_writel(priv, ENETDMAC_IR_PKTDONE_MASK,
ENETDMAC_IRMASK_REG(priv->tx_chan));
return rx_work_done;
}
@ -497,8 +519,8 @@ static irqreturn_t bcm_enet_isr_dma(int irq, void *dev_id)
priv = netdev_priv(dev);
/* mask rx/tx interrupts */
enet_dma_writel(priv, 0, ENETDMA_IRMASK_REG(priv->rx_chan));
enet_dma_writel(priv, 0, ENETDMA_IRMASK_REG(priv->tx_chan));
enet_dmac_writel(priv, 0, ENETDMAC_IRMASK_REG(priv->rx_chan));
enet_dmac_writel(priv, 0, ENETDMAC_IRMASK_REG(priv->tx_chan));
napi_schedule(&priv->napi);
@ -557,8 +579,8 @@ static int bcm_enet_start_xmit(struct sk_buff *skb, struct net_device *dev)
wmb();
/* kick tx dma */
enet_dma_writel(priv, ENETDMA_CHANCFG_EN_MASK,
ENETDMA_CHANCFG_REG(priv->tx_chan));
enet_dmac_writel(priv, ENETDMAC_CHANCFG_EN_MASK,
ENETDMAC_CHANCFG_REG(priv->tx_chan));
/* stop queue if no more desc available */
if (!priv->tx_desc_count)
@ -833,8 +855,8 @@ static int bcm_enet_open(struct net_device *dev)
/* mask all interrupts and request them */
enet_writel(priv, 0, ENET_IRMASK_REG);
enet_dma_writel(priv, 0, ENETDMA_IRMASK_REG(priv->rx_chan));
enet_dma_writel(priv, 0, ENETDMA_IRMASK_REG(priv->tx_chan));
enet_dmac_writel(priv, 0, ENETDMAC_IRMASK_REG(priv->rx_chan));
enet_dmac_writel(priv, 0, ENETDMAC_IRMASK_REG(priv->tx_chan));
ret = request_irq(dev->irq, bcm_enet_isr_mac, 0, dev->name, dev);
if (ret)
@ -919,28 +941,28 @@ static int bcm_enet_open(struct net_device *dev)
}
/* write rx & tx ring addresses */
enet_dma_writel(priv, priv->rx_desc_dma,
ENETDMA_RSTART_REG(priv->rx_chan));
enet_dma_writel(priv, priv->tx_desc_dma,
ENETDMA_RSTART_REG(priv->tx_chan));
enet_dmas_writel(priv, priv->rx_desc_dma,
ENETDMAS_RSTART_REG(priv->rx_chan));
enet_dmas_writel(priv, priv->tx_desc_dma,
ENETDMAS_RSTART_REG(priv->tx_chan));
/* clear remaining state ram for rx & tx channel */
enet_dma_writel(priv, 0, ENETDMA_SRAM2_REG(priv->rx_chan));
enet_dma_writel(priv, 0, ENETDMA_SRAM2_REG(priv->tx_chan));
enet_dma_writel(priv, 0, ENETDMA_SRAM3_REG(priv->rx_chan));
enet_dma_writel(priv, 0, ENETDMA_SRAM3_REG(priv->tx_chan));
enet_dma_writel(priv, 0, ENETDMA_SRAM4_REG(priv->rx_chan));
enet_dma_writel(priv, 0, ENETDMA_SRAM4_REG(priv->tx_chan));
enet_dmas_writel(priv, 0, ENETDMAS_SRAM2_REG(priv->rx_chan));
enet_dmas_writel(priv, 0, ENETDMAS_SRAM2_REG(priv->tx_chan));
enet_dmas_writel(priv, 0, ENETDMAS_SRAM3_REG(priv->rx_chan));
enet_dmas_writel(priv, 0, ENETDMAS_SRAM3_REG(priv->tx_chan));
enet_dmas_writel(priv, 0, ENETDMAS_SRAM4_REG(priv->rx_chan));
enet_dmas_writel(priv, 0, ENETDMAS_SRAM4_REG(priv->tx_chan));
/* set max rx/tx length */
enet_writel(priv, priv->hw_mtu, ENET_RXMAXLEN_REG);
enet_writel(priv, priv->hw_mtu, ENET_TXMAXLEN_REG);
/* set dma maximum burst len */
enet_dma_writel(priv, BCMENET_DMA_MAXBURST,
ENETDMA_MAXBURST_REG(priv->rx_chan));
enet_dma_writel(priv, BCMENET_DMA_MAXBURST,
ENETDMA_MAXBURST_REG(priv->tx_chan));
enet_dmac_writel(priv, BCMENET_DMA_MAXBURST,
ENETDMAC_MAXBURST_REG(priv->rx_chan));
enet_dmac_writel(priv, BCMENET_DMA_MAXBURST,
ENETDMAC_MAXBURST_REG(priv->tx_chan));
/* set correct transmit fifo watermark */
enet_writel(priv, BCMENET_TX_FIFO_TRESH, ENET_TXWMARK_REG);
@ -958,26 +980,26 @@ static int bcm_enet_open(struct net_device *dev)
val |= ENET_CTL_ENABLE_MASK;
enet_writel(priv, val, ENET_CTL_REG);
enet_dma_writel(priv, ENETDMA_CFG_EN_MASK, ENETDMA_CFG_REG);
enet_dma_writel(priv, ENETDMA_CHANCFG_EN_MASK,
ENETDMA_CHANCFG_REG(priv->rx_chan));
enet_dmac_writel(priv, ENETDMAC_CHANCFG_EN_MASK,
ENETDMAC_CHANCFG_REG(priv->rx_chan));
/* watch "mib counters about to overflow" interrupt */
enet_writel(priv, ENET_IR_MIB, ENET_IR_REG);
enet_writel(priv, ENET_IR_MIB, ENET_IRMASK_REG);
/* watch "packet transferred" interrupt in rx and tx */
enet_dma_writel(priv, ENETDMA_IR_PKTDONE_MASK,
ENETDMA_IR_REG(priv->rx_chan));
enet_dma_writel(priv, ENETDMA_IR_PKTDONE_MASK,
ENETDMA_IR_REG(priv->tx_chan));
enet_dmac_writel(priv, ENETDMAC_IR_PKTDONE_MASK,
ENETDMAC_IR_REG(priv->rx_chan));
enet_dmac_writel(priv, ENETDMAC_IR_PKTDONE_MASK,
ENETDMAC_IR_REG(priv->tx_chan));
/* make sure we enable napi before rx interrupt */
napi_enable(&priv->napi);
enet_dma_writel(priv, ENETDMA_IR_PKTDONE_MASK,
ENETDMA_IRMASK_REG(priv->rx_chan));
enet_dma_writel(priv, ENETDMA_IR_PKTDONE_MASK,
ENETDMA_IRMASK_REG(priv->tx_chan));
enet_dmac_writel(priv, ENETDMAC_IR_PKTDONE_MASK,
ENETDMAC_IRMASK_REG(priv->rx_chan));
enet_dmac_writel(priv, ENETDMAC_IR_PKTDONE_MASK,
ENETDMAC_IRMASK_REG(priv->tx_chan));
if (priv->has_phy)
phy_start(priv->phydev);
@ -1057,14 +1079,14 @@ static void bcm_enet_disable_dma(struct bcm_enet_priv *priv, int chan)
{
int limit;
enet_dma_writel(priv, 0, ENETDMA_CHANCFG_REG(chan));
enet_dmac_writel(priv, 0, ENETDMAC_CHANCFG_REG(chan));
limit = 1000;
do {
u32 val;
val = enet_dma_readl(priv, ENETDMA_CHANCFG_REG(chan));
if (!(val & ENETDMA_CHANCFG_EN_MASK))
val = enet_dmac_readl(priv, ENETDMAC_CHANCFG_REG(chan));
if (!(val & ENETDMAC_CHANCFG_EN_MASK))
break;
udelay(1);
} while (limit--);
@ -1090,8 +1112,8 @@ static int bcm_enet_stop(struct net_device *dev)
/* mask all interrupts */
enet_writel(priv, 0, ENET_IRMASK_REG);
enet_dma_writel(priv, 0, ENETDMA_IRMASK_REG(priv->rx_chan));
enet_dma_writel(priv, 0, ENETDMA_IRMASK_REG(priv->tx_chan));
enet_dmac_writel(priv, 0, ENETDMAC_IRMASK_REG(priv->rx_chan));
enet_dmac_writel(priv, 0, ENETDMAC_IRMASK_REG(priv->tx_chan));
/* make sure no mib update is scheduled */
cancel_work_sync(&priv->mib_update_task);
@ -1636,7 +1658,7 @@ static int bcm_enet_probe(struct platform_device *pdev)
/* stop if shared driver failed, assume driver->probe will be
* called in the same order we register devices (correct ?) */
if (!bcm_enet_shared_base)
if (!bcm_enet_shared_base[0])
return -ENODEV;
res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@ -1881,14 +1903,19 @@ struct platform_driver bcm63xx_enet_driver = {
static int bcm_enet_shared_probe(struct platform_device *pdev)
{
struct resource *res;
void __iomem *p[3];
unsigned int i;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENODEV;
memset(bcm_enet_shared_base, 0, sizeof(bcm_enet_shared_base));
bcm_enet_shared_base = devm_request_and_ioremap(&pdev->dev, res);
if (!bcm_enet_shared_base)
return -ENOMEM;
for (i = 0; i < 3; i++) {
res = platform_get_resource(pdev, IORESOURCE_MEM, i);
p[i] = devm_ioremap_resource(&pdev->dev, res);
if (!p[i])
return -ENOMEM;
}
memcpy(bcm_enet_shared_base, p, sizeof(bcm_enet_shared_base));
return 0;
}