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Date: Thu, 29 Jul 2010 16:58:24 -0700
From: Joe Perches <joe@...ches.com>
To: Michael Hennerich <michael.hennerich@...log.com>
Cc: Mike Frysinger <vapier.adi@...il.com>,
uclinux-dist-devel <uclinux-dist-devel@...ckfin.uclinux.org>,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 3/3] drivers/net/bfin_mac.c: Misc function cleanups, neatening
Use new bfin_alloc_skb to centralize skb allocations
Add and use get_mac_addr function
Neaten bfin_mac_init
Neaten bfin_mac_hard_start_xmit
Signed-off-by: Joe Perches <joe@...ches.com>
---
drivers/net/bfin_mac.c | 93 ++++++++++++++++++++++++++---------------------
1 files changed, 51 insertions(+), 42 deletions(-)
diff --git a/drivers/net/bfin_mac.c b/drivers/net/bfin_mac.c
index a1d8119..68afb2a 100644
--- a/drivers/net/bfin_mac.c
+++ b/drivers/net/bfin_mac.c
@@ -81,6 +81,26 @@ static u16 pin_req[] = P_RMII0;
static u16 pin_req[] = P_MII0;
#endif
+static struct sk_buff *bfin_alloc_skb(void)
+{
+ /* allocate a new skb */
+ struct sk_buff *new_skb = dev_alloc_skb(PKT_BUF_SZ + NET_IP_ALIGN);
+
+ if (!new_skb)
+ return NULL;
+
+ skb_reserve(new_skb, NET_IP_ALIGN);
+ /*
+ * Invalidate the data cache of skb->data range
+ * when it is write back cache to prevent overwriting
+ * the new data from DMA.
+ */
+ blackfin_dcache_invalidate_range((unsigned long)new_skb->head,
+ (unsigned long)new_skb->end);
+
+ return new_skb;
+}
+
static void desc_list_free(void)
{
struct net_dma_desc_rx *r;
@@ -193,18 +213,12 @@ static int desc_list_init(void)
struct dma_descriptor *b = &(r->desc_b);
/* allocate a new skb for next time receive */
- new_skb = dev_alloc_skb(PKT_BUF_SZ + NET_IP_ALIGN);
+ new_skb = bfin_alloc_skb();
if (!new_skb) {
pr_notice("init: low on mem - packet dropped\n");
goto init_error;
}
- skb_reserve(new_skb, NET_IP_ALIGN);
- /* Invalidate the data cache of skb->data range when it is
- * write back cache.
- * It will prevent overwriting the new data from DMA
- */
- blackfin_dcache_invalidate_range((unsigned long)new_skb->head,
- (unsigned long)new_skb->end);
+
r->skb = new_skb;
/*
@@ -598,6 +612,16 @@ void setup_system_regs(struct net_device *dev)
bfin_write_DMA1_Y_MODIFY(0);
}
+/* Grab the MAC address in the MAC */
+static void get_mac_addr(u8 *mac_addr)
+{
+ __le32 addr_low = cpu_to_le32(bfin_read_EMAC_ADDRLO());
+ __le16 addr_hi = cpu_to_le16((u16)bfin_read_EMAC_ADDRHI());
+
+ memcpy(mac_addr, &addr_low, 4);
+ memcpy(mac_addr + 4, &addr_hi, 2);
+}
+
static void setup_mac_addr(u8 *mac_addr)
{
u32 addr_low = le32_to_cpu(*(__le32 *)&mac_addr[0]);
@@ -994,15 +1018,17 @@ static void tx_reclaim_skb_timeout(unsigned long lp)
static int bfin_mac_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct bfin_mac_local *lp = netdev_priv(dev);
- u16 *data;
u32 data_align = (unsigned long)(skb->data) & 0x3;
+ unsigned long buf_start;
+ unsigned long buf_len;
union skb_shared_tx *shtx = skb_tx(skb);
current_tx_ptr->skb = skb;
if (data_align == 0x2) {
/* move skb->data to current_tx_ptr payload */
- data = (u16 *)(skb->data) - 1;
+ u16 *data = (u16 *)(skb->data) - 1;
+
*data = (u16)(skb->len);
/*
* When transmitting an Ethernet packet, the PTP_TSYNC module
@@ -1014,23 +1040,21 @@ static int bfin_mac_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
if (shtx->hardware)
*data |= 0x1000;
- current_tx_ptr->desc_a.start_addr = (u32)data;
- /* this is important! */
- blackfin_dcache_flush_range((u32)data,
- (u32)((u8 *)data + skb->len + 4));
+ buf_start = (unsigned long)data;
+ buf_len = skb->len + 4;
} else {
*((u16 *)(current_tx_ptr->packet)) = (u16)(skb->len);
/* enable timestamping for the sent packet */
if (shtx->hardware)
*((u16 *)(current_tx_ptr->packet)) |= 0x1000;
- memcpy((u8 *)(current_tx_ptr->packet + 2), skb->data,
- skb->len);
- current_tx_ptr->desc_a.start_addr =
- (u32)current_tx_ptr->packet;
- blackfin_dcache_flush_range(
- (u32)current_tx_ptr->packet,
- (u32)(current_tx_ptr->packet + skb->len + 2));
+ memcpy(current_tx_ptr->packet + 2, skb->data, skb->len);
+
+ buf_start = (unsigned long)current_tx_ptr->packet;
+ buf_len = skb->len + 2;
}
+ current_tx_ptr->desc_a.start_addr = buf_start;
+ /* this is important! */
+ blackfin_dcache_flush_range(buf_start, buf_start + buf_len);
/*
* Make sure the internal data buffers in the core are drained
@@ -1095,20 +1119,12 @@ static void bfin_mac_rx(struct net_device *dev)
/* allocate a new skb for next time receive */
skb = current_rx_ptr->skb;
- new_skb = dev_alloc_skb(PKT_BUF_SZ + NET_IP_ALIGN);
+ new_skb = bfin_alloc_skb();
if (!new_skb) {
pr_notice("rx: low on mem - packet dropped\n");
dev->stats.rx_dropped++;
goto out;
}
- /* reserve 2 bytes for RXDWA padding */
- skb_reserve(new_skb, NET_IP_ALIGN);
- /*
- * Invalidate the data cache of skb->data range when it is write back
- * cache. It will prevent overwriting the new data from DMA
- */
- blackfin_dcache_invalidate_range((unsigned long)new_skb->head,
- (unsigned long)new_skb->end);
current_rx_ptr->skb = new_skb;
current_rx_ptr->desc_a.start_addr = (unsigned long)new_skb->data - 2;
@@ -1475,14 +1491,10 @@ static int __devinit bfin_mac_probe(struct platform_device *pdev)
lp = netdev_priv(ndev);
lp->ndev = ndev;
- /* Grab the MAC address in the MAC */
- *(__le32 *)(&(ndev->dev_addr[0])) =
- cpu_to_le32(bfin_read_EMAC_ADDRLO());
- *(__le16 *)(&(ndev->dev_addr[4])) =
- cpu_to_le16((u16)bfin_read_EMAC_ADDRHI());
+ get_mac_addr(ndev->dev_addr);
/* probe mac */
- /*todo: how to proble? which is revision_register */
+ /* todo: how to probe? which is revision_register */
bfin_write_EMAC_ADDRLO(0x12345678);
if (bfin_read_EMAC_ADDRLO() != 0x12345678) {
dev_err(&pdev->dev, "Cannot detect Blackfin on-chip ethernet MAC controller!\n");
@@ -1718,12 +1730,9 @@ static struct platform_driver bfin_mac_driver = {
static int __init bfin_mac_init(void)
{
- int ret;
-
- ret = platform_driver_register(&bfin_mii_bus_driver);
- if (!ret)
- return platform_driver_register(&bfin_mac_driver);
- return -ENODEV;
+ if (platform_driver_register(&bfin_mii_bus_driver))
+ return -ENODEV;
+ return platform_driver_register(&bfin_mac_driver);
}
module_init(bfin_mac_init);
--
1.7.2.19.g9a302
--
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