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linux-pinenote/drivers/net/ethernet/xilinx/ll_temac_main.c
Julia Lawall 8a0a1f840f net: Xilinx: fix error return code 
Return a negative error code on failure.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
identifier ret; expression e1,e2;
@@
(
if (\(ret < 0\|ret != 0\))
 { ... return ret; }
|
ret = 0
)
... when != ret = e1
    when != &ret
*if(...)
{
  ... when != ret = e2
      when forall
 return ret;
}
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-12-31 19:19:00 -05:00

1182 lines
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/*
* Driver for Xilinx TEMAC Ethernet device
*
* Copyright (c) 2008 Nissin Systems Co., Ltd., Yoshio Kashiwagi
* Copyright (c) 2005-2008 DLA Systems, David H. Lynch Jr. <dhlii@dlasys.net>
* Copyright (c) 2008-2009 Secret Lab Technologies Ltd.
*
* This is a driver for the Xilinx ll_temac ipcore which is often used
* in the Virtex and Spartan series of chips.
*
* Notes:
* - The ll_temac hardware uses indirect access for many of the TEMAC
* registers, include the MDIO bus. However, indirect access to MDIO
* registers take considerably more clock cycles than to TEMAC registers.
* MDIO accesses are long, so threads doing them should probably sleep
* rather than busywait. However, since only one indirect access can be
* in progress at any given time, that means that *all* indirect accesses
* could end up sleeping (to wait for an MDIO access to complete).
* Fortunately none of the indirect accesses are on the 'hot' path for tx
* or rx, so this should be okay.
*
* TODO:
* - Factor out locallink DMA code into separate driver
* - Fix multicast assignment.
* - Fix support for hardware checksumming.
* - Testing. Lots and lots of testing.
*
*/
#include <linux/delay.h>
#include <linux/etherdevice.h>
#include <linux/mii.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/netdevice.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/of_mdio.h>
#include <linux/of_platform.h>
#include <linux/of_address.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/tcp.h> /* needed for sizeof(tcphdr) */
#include <linux/udp.h> /* needed for sizeof(udphdr) */
#include <linux/phy.h>
#include <linux/in.h>
#include <linux/io.h>
#include <linux/ip.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
#include "ll_temac.h"
#define TX_BD_NUM 64
#define RX_BD_NUM 128
/* ---------------------------------------------------------------------
* Low level register access functions
*/
u32 temac_ior(struct temac_local *lp, int offset)
{
return in_be32((u32 *)(lp->regs + offset));
}
void temac_iow(struct temac_local *lp, int offset, u32 value)
{
out_be32((u32 *) (lp->regs + offset), value);
}
int temac_indirect_busywait(struct temac_local *lp)
{
unsigned long end = jiffies + 2;
while (!(temac_ior(lp, XTE_RDY0_OFFSET) & XTE_RDY0_HARD_ACS_RDY_MASK)) {
if (time_before_eq(end, jiffies)) {
WARN_ON(1);
return -ETIMEDOUT;
}
msleep(1);
}
return 0;
}
/**
* temac_indirect_in32
*
* lp->indirect_mutex must be held when calling this function
*/
u32 temac_indirect_in32(struct temac_local *lp, int reg)
{
u32 val;
if (temac_indirect_busywait(lp))
return -ETIMEDOUT;
temac_iow(lp, XTE_CTL0_OFFSET, reg);
if (temac_indirect_busywait(lp))
return -ETIMEDOUT;
val = temac_ior(lp, XTE_LSW0_OFFSET);
return val;
}
/**
* temac_indirect_out32
*
* lp->indirect_mutex must be held when calling this function
*/
void temac_indirect_out32(struct temac_local *lp, int reg, u32 value)
{
if (temac_indirect_busywait(lp))
return;
temac_iow(lp, XTE_LSW0_OFFSET, value);
temac_iow(lp, XTE_CTL0_OFFSET, CNTLREG_WRITE_ENABLE_MASK | reg);
temac_indirect_busywait(lp);
}
/**
* temac_dma_in32 - Memory mapped DMA read, this function expects a
* register input that is based on DCR word addresses which
* are then converted to memory mapped byte addresses
*/
static u32 temac_dma_in32(struct temac_local *lp, int reg)
{
return in_be32((u32 *)(lp->sdma_regs + (reg << 2)));
}
/**
* temac_dma_out32 - Memory mapped DMA read, this function expects a
* register input that is based on DCR word addresses which
* are then converted to memory mapped byte addresses
*/
static void temac_dma_out32(struct temac_local *lp, int reg, u32 value)
{
out_be32((u32 *)(lp->sdma_regs + (reg << 2)), value);
}
/* DMA register access functions can be DCR based or memory mapped.
* The PowerPC 440 is DCR based, the PowerPC 405 and MicroBlaze are both
* memory mapped.
*/
#ifdef CONFIG_PPC_DCR
/**
* temac_dma_dcr_in32 - DCR based DMA read
*/
static u32 temac_dma_dcr_in(struct temac_local *lp, int reg)
{
return dcr_read(lp->sdma_dcrs, reg);
}
/**
* temac_dma_dcr_out32 - DCR based DMA write
*/
static void temac_dma_dcr_out(struct temac_local *lp, int reg, u32 value)
{
dcr_write(lp->sdma_dcrs, reg, value);
}
/**
* temac_dcr_setup - If the DMA is DCR based, then setup the address and
* I/O functions
*/
static int temac_dcr_setup(struct temac_local *lp, struct platform_device *op,
struct device_node *np)
{
unsigned int dcrs;
/* setup the dcr address mapping if it's in the device tree */
dcrs = dcr_resource_start(np, 0);
if (dcrs != 0) {
lp->sdma_dcrs = dcr_map(np, dcrs, dcr_resource_len(np, 0));
lp->dma_in = temac_dma_dcr_in;
lp->dma_out = temac_dma_dcr_out;
dev_dbg(&op->dev, "DCR base: %x\n", dcrs);
return 0;
}
/* no DCR in the device tree, indicate a failure */
return -1;
}
#else
/*
* temac_dcr_setup - This is a stub for when DCR is not supported,
* such as with MicroBlaze
*/
static int temac_dcr_setup(struct temac_local *lp, struct platform_device *op,
struct device_node *np)
{
return -1;
}
#endif
/**
* temac_dma_bd_release - Release buffer descriptor rings
*/
static void temac_dma_bd_release(struct net_device *ndev)
{
struct temac_local *lp = netdev_priv(ndev);
int i;
/* Reset Local Link (DMA) */
lp->dma_out(lp, DMA_CONTROL_REG, DMA_CONTROL_RST);
for (i = 0; i < RX_BD_NUM; i++) {
if (!lp->rx_skb[i])
break;
else {
dma_unmap_single(ndev->dev.parent, lp->rx_bd_v[i].phys,
XTE_MAX_JUMBO_FRAME_SIZE, DMA_FROM_DEVICE);
dev_kfree_skb(lp->rx_skb[i]);
}
}
if (lp->rx_bd_v)
dma_free_coherent(ndev->dev.parent,
sizeof(*lp->rx_bd_v) * RX_BD_NUM,
lp->rx_bd_v, lp->rx_bd_p);
if (lp->tx_bd_v)
dma_free_coherent(ndev->dev.parent,
sizeof(*lp->tx_bd_v) * TX_BD_NUM,
lp->tx_bd_v, lp->tx_bd_p);
kfree(lp->rx_skb);
}
/**
* temac_dma_bd_init - Setup buffer descriptor rings
*/
static int temac_dma_bd_init(struct net_device *ndev)
{
struct temac_local *lp = netdev_priv(ndev);
struct sk_buff *skb;
int i;
lp->rx_skb = kcalloc(RX_BD_NUM, sizeof(*lp->rx_skb), GFP_KERNEL);
if (!lp->rx_skb)
goto out;
/* allocate the tx and rx ring buffer descriptors. */
/* returns a virtual address and a physical address. */
lp->tx_bd_v = dma_zalloc_coherent(ndev->dev.parent,
sizeof(*lp->tx_bd_v) * TX_BD_NUM,
&lp->tx_bd_p, GFP_KERNEL);
if (!lp->tx_bd_v)
goto out;
lp->rx_bd_v = dma_zalloc_coherent(ndev->dev.parent,
sizeof(*lp->rx_bd_v) * RX_BD_NUM,
&lp->rx_bd_p, GFP_KERNEL);
if (!lp->rx_bd_v)
goto out;
for (i = 0; i < TX_BD_NUM; i++) {
lp->tx_bd_v[i].next = lp->tx_bd_p +
sizeof(*lp->tx_bd_v) * ((i + 1) % TX_BD_NUM);
}
for (i = 0; i < RX_BD_NUM; i++) {
lp->rx_bd_v[i].next = lp->rx_bd_p +
sizeof(*lp->rx_bd_v) * ((i + 1) % RX_BD_NUM);
skb = netdev_alloc_skb_ip_align(ndev,
XTE_MAX_JUMBO_FRAME_SIZE);
if (!skb)
goto out;
lp->rx_skb[i] = skb;
/* returns physical address of skb->data */
lp->rx_bd_v[i].phys = dma_map_single(ndev->dev.parent,
skb->data,
XTE_MAX_JUMBO_FRAME_SIZE,
DMA_FROM_DEVICE);
lp->rx_bd_v[i].len = XTE_MAX_JUMBO_FRAME_SIZE;
lp->rx_bd_v[i].app0 = STS_CTRL_APP0_IRQONEND;
}
lp->dma_out(lp, TX_CHNL_CTRL, 0x10220400 |
CHNL_CTRL_IRQ_EN |
CHNL_CTRL_IRQ_DLY_EN |
CHNL_CTRL_IRQ_COAL_EN);
/* 0x10220483 */
/* 0x00100483 */
lp->dma_out(lp, RX_CHNL_CTRL, 0xff070000 |
CHNL_CTRL_IRQ_EN |
CHNL_CTRL_IRQ_DLY_EN |
CHNL_CTRL_IRQ_COAL_EN |
CHNL_CTRL_IRQ_IOE);
/* 0xff010283 */
lp->dma_out(lp, RX_CURDESC_PTR, lp->rx_bd_p);
lp->dma_out(lp, RX_TAILDESC_PTR,
lp->rx_bd_p + (sizeof(*lp->rx_bd_v) * (RX_BD_NUM - 1)));
lp->dma_out(lp, TX_CURDESC_PTR, lp->tx_bd_p);
/* Init descriptor indexes */
lp->tx_bd_ci = 0;
lp->tx_bd_next = 0;
lp->tx_bd_tail = 0;
lp->rx_bd_ci = 0;
return 0;
out:
temac_dma_bd_release(ndev);
return -ENOMEM;
}
/* ---------------------------------------------------------------------
* net_device_ops
*/
static void temac_do_set_mac_address(struct net_device *ndev)
{
struct temac_local *lp = netdev_priv(ndev);
/* set up unicast MAC address filter set its mac address */
mutex_lock(&lp->indirect_mutex);
temac_indirect_out32(lp, XTE_UAW0_OFFSET,
(ndev->dev_addr[0]) |
(ndev->dev_addr[1] << 8) |
(ndev->dev_addr[2] << 16) |
(ndev->dev_addr[3] << 24));
/* There are reserved bits in EUAW1
* so don't affect them Set MAC bits [47:32] in EUAW1 */
temac_indirect_out32(lp, XTE_UAW1_OFFSET,
(ndev->dev_addr[4] & 0x000000ff) |
(ndev->dev_addr[5] << 8));
mutex_unlock(&lp->indirect_mutex);
}
static int temac_init_mac_address(struct net_device *ndev, void *address)
{
memcpy(ndev->dev_addr, address, ETH_ALEN);
if (!is_valid_ether_addr(ndev->dev_addr))
eth_hw_addr_random(ndev);
temac_do_set_mac_address(ndev);
return 0;
}
static int temac_set_mac_address(struct net_device *ndev, void *p)
{
struct sockaddr *addr = p;
if (!is_valid_ether_addr(addr->sa_data))
return -EADDRNOTAVAIL;
memcpy(ndev->dev_addr, addr->sa_data, ETH_ALEN);
temac_do_set_mac_address(ndev);
return 0;
}
static void temac_set_multicast_list(struct net_device *ndev)
{
struct temac_local *lp = netdev_priv(ndev);
u32 multi_addr_msw, multi_addr_lsw, val;
int i;
mutex_lock(&lp->indirect_mutex);
if (ndev->flags & (IFF_ALLMULTI | IFF_PROMISC) ||
netdev_mc_count(ndev) > MULTICAST_CAM_TABLE_NUM) {
/*
* We must make the kernel realise we had to move
* into promisc mode or we start all out war on
* the cable. If it was a promisc request the
* flag is already set. If not we assert it.
*/
ndev->flags |= IFF_PROMISC;
temac_indirect_out32(lp, XTE_AFM_OFFSET, XTE_AFM_EPPRM_MASK);
dev_info(&ndev->dev, "Promiscuous mode enabled.\n");
} else if (!netdev_mc_empty(ndev)) {
struct netdev_hw_addr *ha;
i = 0;
netdev_for_each_mc_addr(ha, ndev) {
if (i >= MULTICAST_CAM_TABLE_NUM)
break;
multi_addr_msw = ((ha->addr[3] << 24) |
(ha->addr[2] << 16) |
(ha->addr[1] << 8) |
(ha->addr[0]));
temac_indirect_out32(lp, XTE_MAW0_OFFSET,
multi_addr_msw);
multi_addr_lsw = ((ha->addr[5] << 8) |
(ha->addr[4]) | (i << 16));
temac_indirect_out32(lp, XTE_MAW1_OFFSET,
multi_addr_lsw);
i++;
}
} else {
val = temac_indirect_in32(lp, XTE_AFM_OFFSET);
temac_indirect_out32(lp, XTE_AFM_OFFSET,
val & ~XTE_AFM_EPPRM_MASK);
temac_indirect_out32(lp, XTE_MAW0_OFFSET, 0);
temac_indirect_out32(lp, XTE_MAW1_OFFSET, 0);
dev_info(&ndev->dev, "Promiscuous mode disabled.\n");
}
mutex_unlock(&lp->indirect_mutex);
}
struct temac_option {
int flg;
u32 opt;
u32 reg;
u32 m_or;
u32 m_and;
} temac_options[] = {
/* Turn on jumbo packet support for both Rx and Tx */
{
.opt = XTE_OPTION_JUMBO,
.reg = XTE_TXC_OFFSET,
.m_or = XTE_TXC_TXJMBO_MASK,
},
{
.opt = XTE_OPTION_JUMBO,
.reg = XTE_RXC1_OFFSET,
.m_or =XTE_RXC1_RXJMBO_MASK,
},
/* Turn on VLAN packet support for both Rx and Tx */
{
.opt = XTE_OPTION_VLAN,
.reg = XTE_TXC_OFFSET,
.m_or =XTE_TXC_TXVLAN_MASK,
},
{
.opt = XTE_OPTION_VLAN,
.reg = XTE_RXC1_OFFSET,
.m_or =XTE_RXC1_RXVLAN_MASK,
},
/* Turn on FCS stripping on receive packets */
{
.opt = XTE_OPTION_FCS_STRIP,
.reg = XTE_RXC1_OFFSET,
.m_or =XTE_RXC1_RXFCS_MASK,
},
/* Turn on FCS insertion on transmit packets */
{
.opt = XTE_OPTION_FCS_INSERT,
.reg = XTE_TXC_OFFSET,
.m_or =XTE_TXC_TXFCS_MASK,
},
/* Turn on length/type field checking on receive packets */
{
.opt = XTE_OPTION_LENTYPE_ERR,
.reg = XTE_RXC1_OFFSET,
.m_or =XTE_RXC1_RXLT_MASK,
},
/* Turn on flow control */
{
.opt = XTE_OPTION_FLOW_CONTROL,
.reg = XTE_FCC_OFFSET,
.m_or =XTE_FCC_RXFLO_MASK,
},
/* Turn on flow control */
{
.opt = XTE_OPTION_FLOW_CONTROL,
.reg = XTE_FCC_OFFSET,
.m_or =XTE_FCC_TXFLO_MASK,
},
/* Turn on promiscuous frame filtering (all frames are received ) */
{
.opt = XTE_OPTION_PROMISC,
.reg = XTE_AFM_OFFSET,
.m_or =XTE_AFM_EPPRM_MASK,
},
/* Enable transmitter if not already enabled */
{
.opt = XTE_OPTION_TXEN,
.reg = XTE_TXC_OFFSET,
.m_or =XTE_TXC_TXEN_MASK,
},
/* Enable receiver? */
{
.opt = XTE_OPTION_RXEN,
.reg = XTE_RXC1_OFFSET,
.m_or =XTE_RXC1_RXEN_MASK,
},
{}
};
/**
* temac_setoptions
*/
static u32 temac_setoptions(struct net_device *ndev, u32 options)
{
struct temac_local *lp = netdev_priv(ndev);
struct temac_option *tp = &temac_options[0];
int reg;
mutex_lock(&lp->indirect_mutex);
while (tp->opt) {
reg = temac_indirect_in32(lp, tp->reg) & ~tp->m_or;
if (options & tp->opt)
reg |= tp->m_or;
temac_indirect_out32(lp, tp->reg, reg);
tp++;
}
lp->options |= options;
mutex_unlock(&lp->indirect_mutex);
return 0;
}
/* Initialize temac */
static void temac_device_reset(struct net_device *ndev)
{
struct temac_local *lp = netdev_priv(ndev);
u32 timeout;
u32 val;
/* Perform a software reset */
/* 0x300 host enable bit ? */
/* reset PHY through control register ?:1 */
dev_dbg(&ndev->dev, "%s()\n", __func__);
mutex_lock(&lp->indirect_mutex);
/* Reset the receiver and wait for it to finish reset */
temac_indirect_out32(lp, XTE_RXC1_OFFSET, XTE_RXC1_RXRST_MASK);
timeout = 1000;
while (temac_indirect_in32(lp, XTE_RXC1_OFFSET) & XTE_RXC1_RXRST_MASK) {
udelay(1);
if (--timeout == 0) {
dev_err(&ndev->dev,
"temac_device_reset RX reset timeout!!\n");
break;
}
}
/* Reset the transmitter and wait for it to finish reset */
temac_indirect_out32(lp, XTE_TXC_OFFSET, XTE_TXC_TXRST_MASK);
timeout = 1000;
while (temac_indirect_in32(lp, XTE_TXC_OFFSET) & XTE_TXC_TXRST_MASK) {
udelay(1);
if (--timeout == 0) {
dev_err(&ndev->dev,
"temac_device_reset TX reset timeout!!\n");
break;
}
}
/* Disable the receiver */
val = temac_indirect_in32(lp, XTE_RXC1_OFFSET);
temac_indirect_out32(lp, XTE_RXC1_OFFSET, val & ~XTE_RXC1_RXEN_MASK);
/* Reset Local Link (DMA) */
lp->dma_out(lp, DMA_CONTROL_REG, DMA_CONTROL_RST);
timeout = 1000;
while (lp->dma_in(lp, DMA_CONTROL_REG) & DMA_CONTROL_RST) {
udelay(1);
if (--timeout == 0) {
dev_err(&ndev->dev,
"temac_device_reset DMA reset timeout!!\n");
break;
}
}
lp->dma_out(lp, DMA_CONTROL_REG, DMA_TAIL_ENABLE);
if (temac_dma_bd_init(ndev)) {
dev_err(&ndev->dev,
"temac_device_reset descriptor allocation failed\n");
}
temac_indirect_out32(lp, XTE_RXC0_OFFSET, 0);
temac_indirect_out32(lp, XTE_RXC1_OFFSET, 0);
temac_indirect_out32(lp, XTE_TXC_OFFSET, 0);
temac_indirect_out32(lp, XTE_FCC_OFFSET, XTE_FCC_RXFLO_MASK);
mutex_unlock(&lp->indirect_mutex);
/* Sync default options with HW
* but leave receiver and transmitter disabled. */
temac_setoptions(ndev,
lp->options & ~(XTE_OPTION_TXEN | XTE_OPTION_RXEN));
temac_do_set_mac_address(ndev);
/* Set address filter table */
temac_set_multicast_list(ndev);
if (temac_setoptions(ndev, lp->options))
dev_err(&ndev->dev, "Error setting TEMAC options\n");
/* Init Driver variable */
ndev->trans_start = jiffies; /* prevent tx timeout */
}
void temac_adjust_link(struct net_device *ndev)
{
struct temac_local *lp = netdev_priv(ndev);
struct phy_device *phy = lp->phy_dev;
u32 mii_speed;
int link_state;
/* hash together the state values to decide if something has changed */
link_state = phy->speed | (phy->duplex << 1) | phy->link;
mutex_lock(&lp->indirect_mutex);
if (lp->last_link != link_state) {
mii_speed = temac_indirect_in32(lp, XTE_EMCFG_OFFSET);
mii_speed &= ~XTE_EMCFG_LINKSPD_MASK;
switch (phy->speed) {
case SPEED_1000: mii_speed |= XTE_EMCFG_LINKSPD_1000; break;
case SPEED_100: mii_speed |= XTE_EMCFG_LINKSPD_100; break;
case SPEED_10: mii_speed |= XTE_EMCFG_LINKSPD_10; break;
}
/* Write new speed setting out to TEMAC */
temac_indirect_out32(lp, XTE_EMCFG_OFFSET, mii_speed);
lp->last_link = link_state;
phy_print_status(phy);
}
mutex_unlock(&lp->indirect_mutex);
}
static void temac_start_xmit_done(struct net_device *ndev)
{
struct temac_local *lp = netdev_priv(ndev);
struct cdmac_bd *cur_p;
unsigned int stat = 0;
cur_p = &lp->tx_bd_v[lp->tx_bd_ci];
stat = cur_p->app0;
while (stat & STS_CTRL_APP0_CMPLT) {
dma_unmap_single(ndev->dev.parent, cur_p->phys, cur_p->len,
DMA_TO_DEVICE);
if (cur_p->app4)
dev_kfree_skb_irq((struct sk_buff *)cur_p->app4);
cur_p->app0 = 0;
cur_p->app1 = 0;
cur_p->app2 = 0;
cur_p->app3 = 0;
cur_p->app4 = 0;
ndev->stats.tx_packets++;
ndev->stats.tx_bytes += cur_p->len;
lp->tx_bd_ci++;
if (lp->tx_bd_ci >= TX_BD_NUM)
lp->tx_bd_ci = 0;
cur_p = &lp->tx_bd_v[lp->tx_bd_ci];
stat = cur_p->app0;
}
netif_wake_queue(ndev);
}
static inline int temac_check_tx_bd_space(struct temac_local *lp, int num_frag)
{
struct cdmac_bd *cur_p;
int tail;
tail = lp->tx_bd_tail;
cur_p = &lp->tx_bd_v[tail];
do {
if (cur_p->app0)
return NETDEV_TX_BUSY;
tail++;
if (tail >= TX_BD_NUM)
tail = 0;
cur_p = &lp->tx_bd_v[tail];
num_frag--;
} while (num_frag >= 0);
return 0;
}
static int temac_start_xmit(struct sk_buff *skb, struct net_device *ndev)
{
struct temac_local *lp = netdev_priv(ndev);
struct cdmac_bd *cur_p;
dma_addr_t start_p, tail_p;
int ii;
unsigned long num_frag;
skb_frag_t *frag;
num_frag = skb_shinfo(skb)->nr_frags;
frag = &skb_shinfo(skb)->frags[0];
start_p = lp->tx_bd_p + sizeof(*lp->tx_bd_v) * lp->tx_bd_tail;
cur_p = &lp->tx_bd_v[lp->tx_bd_tail];
if (temac_check_tx_bd_space(lp, num_frag)) {
if (!netif_queue_stopped(ndev)) {
netif_stop_queue(ndev);
return NETDEV_TX_BUSY;
}
return NETDEV_TX_BUSY;
}
cur_p->app0 = 0;
if (skb->ip_summed == CHECKSUM_PARTIAL) {
unsigned int csum_start_off = skb_checksum_start_offset(skb);
unsigned int csum_index_off = csum_start_off + skb->csum_offset;
cur_p->app0 |= 1; /* TX Checksum Enabled */
cur_p->app1 = (csum_start_off << 16) | csum_index_off;
cur_p->app2 = 0; /* initial checksum seed */
}
cur_p->app0 |= STS_CTRL_APP0_SOP;
cur_p->len = skb_headlen(skb);
cur_p->phys = dma_map_single(ndev->dev.parent, skb->data, skb->len,
DMA_TO_DEVICE);
cur_p->app4 = (unsigned long)skb;
for (ii = 0; ii < num_frag; ii++) {
lp->tx_bd_tail++;
if (lp->tx_bd_tail >= TX_BD_NUM)
lp->tx_bd_tail = 0;
cur_p = &lp->tx_bd_v[lp->tx_bd_tail];
cur_p->phys = dma_map_single(ndev->dev.parent,
skb_frag_address(frag),
skb_frag_size(frag), DMA_TO_DEVICE);
cur_p->len = skb_frag_size(frag);
cur_p->app0 = 0;
frag++;
}
cur_p->app0 |= STS_CTRL_APP0_EOP;
tail_p = lp->tx_bd_p + sizeof(*lp->tx_bd_v) * lp->tx_bd_tail;
lp->tx_bd_tail++;
if (lp->tx_bd_tail >= TX_BD_NUM)
lp->tx_bd_tail = 0;
skb_tx_timestamp(skb);
/* Kick off the transfer */
lp->dma_out(lp, TX_TAILDESC_PTR, tail_p); /* DMA start */
return NETDEV_TX_OK;
}
static void ll_temac_recv(struct net_device *ndev)
{
struct temac_local *lp = netdev_priv(ndev);
struct sk_buff *skb, *new_skb;
unsigned int bdstat;
struct cdmac_bd *cur_p;
dma_addr_t tail_p;
int length;
unsigned long flags;
spin_lock_irqsave(&lp->rx_lock, flags);
tail_p = lp->rx_bd_p + sizeof(*lp->rx_bd_v) * lp->rx_bd_ci;
cur_p = &lp->rx_bd_v[lp->rx_bd_ci];
bdstat = cur_p->app0;
while ((bdstat & STS_CTRL_APP0_CMPLT)) {
skb = lp->rx_skb[lp->rx_bd_ci];
length = cur_p->app4 & 0x3FFF;
dma_unmap_single(ndev->dev.parent, cur_p->phys, length,
DMA_FROM_DEVICE);
skb_put(skb, length);
skb->protocol = eth_type_trans(skb, ndev);
skb_checksum_none_assert(skb);
/* if we're doing rx csum offload, set it up */
if (((lp->temac_features & TEMAC_FEATURE_RX_CSUM) != 0) &&
(skb->protocol == htons(ETH_P_IP)) &&
(skb->len > 64)) {
skb->csum = cur_p->app3 & 0xFFFF;
skb->ip_summed = CHECKSUM_COMPLETE;
}
if (!skb_defer_rx_timestamp(skb))
netif_rx(skb);
ndev->stats.rx_packets++;
ndev->stats.rx_bytes += length;
new_skb = netdev_alloc_skb_ip_align(ndev,
XTE_MAX_JUMBO_FRAME_SIZE);
if (!new_skb) {
spin_unlock_irqrestore(&lp->rx_lock, flags);
return;
}
cur_p->app0 = STS_CTRL_APP0_IRQONEND;
cur_p->phys = dma_map_single(ndev->dev.parent, new_skb->data,
XTE_MAX_JUMBO_FRAME_SIZE,
DMA_FROM_DEVICE);
cur_p->len = XTE_MAX_JUMBO_FRAME_SIZE;
lp->rx_skb[lp->rx_bd_ci] = new_skb;
lp->rx_bd_ci++;
if (lp->rx_bd_ci >= RX_BD_NUM)
lp->rx_bd_ci = 0;
cur_p = &lp->rx_bd_v[lp->rx_bd_ci];
bdstat = cur_p->app0;
}
lp->dma_out(lp, RX_TAILDESC_PTR, tail_p);
spin_unlock_irqrestore(&lp->rx_lock, flags);
}
static irqreturn_t ll_temac_tx_irq(int irq, void *_ndev)
{
struct net_device *ndev = _ndev;
struct temac_local *lp = netdev_priv(ndev);
unsigned int status;
status = lp->dma_in(lp, TX_IRQ_REG);
lp->dma_out(lp, TX_IRQ_REG, status);
if (status & (IRQ_COAL | IRQ_DLY))
temac_start_xmit_done(lp->ndev);
if (status & 0x080)
dev_err(&ndev->dev, "DMA error 0x%x\n", status);
return IRQ_HANDLED;
}
static irqreturn_t ll_temac_rx_irq(int irq, void *_ndev)
{
struct net_device *ndev = _ndev;
struct temac_local *lp = netdev_priv(ndev);
unsigned int status;
/* Read and clear the status registers */
status = lp->dma_in(lp, RX_IRQ_REG);
lp->dma_out(lp, RX_IRQ_REG, status);
if (status & (IRQ_COAL | IRQ_DLY))
ll_temac_recv(lp->ndev);
return IRQ_HANDLED;
}
static int temac_open(struct net_device *ndev)
{
struct temac_local *lp = netdev_priv(ndev);
int rc;
dev_dbg(&ndev->dev, "temac_open()\n");
if (lp->phy_node) {
lp->phy_dev = of_phy_connect(lp->ndev, lp->phy_node,
temac_adjust_link, 0, 0);
if (!lp->phy_dev) {
dev_err(lp->dev, "of_phy_connect() failed\n");
return -ENODEV;
}
phy_start(lp->phy_dev);
}
temac_device_reset(ndev);
rc = request_irq(lp->tx_irq, ll_temac_tx_irq, 0, ndev->name, ndev);
if (rc)
goto err_tx_irq;
rc = request_irq(lp->rx_irq, ll_temac_rx_irq, 0, ndev->name, ndev);
if (rc)
goto err_rx_irq;
return 0;
err_rx_irq:
free_irq(lp->tx_irq, ndev);
err_tx_irq:
if (lp->phy_dev)
phy_disconnect(lp->phy_dev);
lp->phy_dev = NULL;
dev_err(lp->dev, "request_irq() failed\n");
return rc;
}
static int temac_stop(struct net_device *ndev)
{
struct temac_local *lp = netdev_priv(ndev);
dev_dbg(&ndev->dev, "temac_close()\n");
free_irq(lp->tx_irq, ndev);
free_irq(lp->rx_irq, ndev);
if (lp->phy_dev)
phy_disconnect(lp->phy_dev);
lp->phy_dev = NULL;
temac_dma_bd_release(ndev);
return 0;
}
#ifdef CONFIG_NET_POLL_CONTROLLER
static void
temac_poll_controller(struct net_device *ndev)
{
struct temac_local *lp = netdev_priv(ndev);
disable_irq(lp->tx_irq);
disable_irq(lp->rx_irq);
ll_temac_rx_irq(lp->tx_irq, ndev);
ll_temac_tx_irq(lp->rx_irq, ndev);
enable_irq(lp->tx_irq);
enable_irq(lp->rx_irq);
}
#endif
static int temac_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd)
{
struct temac_local *lp = netdev_priv(ndev);
if (!netif_running(ndev))
return -EINVAL;
if (!lp->phy_dev)
return -EINVAL;
return phy_mii_ioctl(lp->phy_dev, rq, cmd);
}
static const struct net_device_ops temac_netdev_ops = {
.ndo_open = temac_open,
.ndo_stop = temac_stop,
.ndo_start_xmit = temac_start_xmit,
.ndo_set_mac_address = temac_set_mac_address,
.ndo_validate_addr = eth_validate_addr,
.ndo_do_ioctl = temac_ioctl,
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_poll_controller = temac_poll_controller,
#endif
};
/* ---------------------------------------------------------------------
* SYSFS device attributes
*/
static ssize_t temac_show_llink_regs(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct net_device *ndev = dev_get_drvdata(dev);
struct temac_local *lp = netdev_priv(ndev);
int i, len = 0;
for (i = 0; i < 0x11; i++)
len += sprintf(buf + len, "%.8x%s", lp->dma_in(lp, i),
(i % 8) == 7 ? "\n" : " ");
len += sprintf(buf + len, "\n");
return len;
}
static DEVICE_ATTR(llink_regs, 0440, temac_show_llink_regs, NULL);
static struct attribute *temac_device_attrs[] = {
&dev_attr_llink_regs.attr,
NULL,
};
static const struct attribute_group temac_attr_group = {
.attrs = temac_device_attrs,
};
/* ethtool support */
static int temac_get_settings(struct net_device *ndev, struct ethtool_cmd *cmd)
{
struct temac_local *lp = netdev_priv(ndev);
return phy_ethtool_gset(lp->phy_dev, cmd);
}
static int temac_set_settings(struct net_device *ndev, struct ethtool_cmd *cmd)
{
struct temac_local *lp = netdev_priv(ndev);
return phy_ethtool_sset(lp->phy_dev, cmd);
}
static int temac_nway_reset(struct net_device *ndev)
{
struct temac_local *lp = netdev_priv(ndev);
return phy_start_aneg(lp->phy_dev);
}
static const struct ethtool_ops temac_ethtool_ops = {
.get_settings = temac_get_settings,
.set_settings = temac_set_settings,
.nway_reset = temac_nway_reset,
.get_link = ethtool_op_get_link,
.get_ts_info = ethtool_op_get_ts_info,
};
static int temac_of_probe(struct platform_device *op)
{
struct device_node *np;
struct temac_local *lp;
struct net_device *ndev;
const void *addr;
__be32 *p;
int size, rc = 0;
/* Init network device structure */
ndev = alloc_etherdev(sizeof(*lp));
if (!ndev)
return -ENOMEM;
platform_set_drvdata(op, ndev);
SET_NETDEV_DEV(ndev, &op->dev);
ndev->flags &= ~IFF_MULTICAST; /* clear multicast */
ndev->features = NETIF_F_SG;
ndev->netdev_ops = &temac_netdev_ops;
ndev->ethtool_ops = &temac_ethtool_ops;
#if 0
ndev->features |= NETIF_F_IP_CSUM; /* Can checksum TCP/UDP over IPv4. */
ndev->features |= NETIF_F_HW_CSUM; /* Can checksum all the packets. */
ndev->features |= NETIF_F_IPV6_CSUM; /* Can checksum IPV6 TCP/UDP */
ndev->features |= NETIF_F_HIGHDMA; /* Can DMA to high memory. */
ndev->features |= NETIF_F_HW_VLAN_CTAG_TX; /* Transmit VLAN hw accel */
ndev->features |= NETIF_F_HW_VLAN_CTAG_RX; /* Receive VLAN hw acceleration */
ndev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; /* Receive VLAN filtering */
ndev->features |= NETIF_F_VLAN_CHALLENGED; /* cannot handle VLAN pkts */
ndev->features |= NETIF_F_GSO; /* Enable software GSO. */
ndev->features |= NETIF_F_MULTI_QUEUE; /* Has multiple TX/RX queues */
ndev->features |= NETIF_F_LRO; /* large receive offload */
#endif
/* setup temac private info structure */
lp = netdev_priv(ndev);
lp->ndev = ndev;
lp->dev = &op->dev;
lp->options = XTE_OPTION_DEFAULTS;
spin_lock_init(&lp->rx_lock);
mutex_init(&lp->indirect_mutex);
/* map device registers */
lp->regs = of_iomap(op->dev.of_node, 0);
if (!lp->regs) {
dev_err(&op->dev, "could not map temac regs.\n");
rc = -ENOMEM;
goto nodev;
}
/* Setup checksum offload, but default to off if not specified */
lp->temac_features = 0;
p = (__be32 *)of_get_property(op->dev.of_node, "xlnx,txcsum", NULL);
if (p && be32_to_cpu(*p)) {
lp->temac_features |= TEMAC_FEATURE_TX_CSUM;
/* Can checksum TCP/UDP over IPv4. */
ndev->features |= NETIF_F_IP_CSUM;
}
p = (__be32 *)of_get_property(op->dev.of_node, "xlnx,rxcsum", NULL);
if (p && be32_to_cpu(*p))
lp->temac_features |= TEMAC_FEATURE_RX_CSUM;
/* Find the DMA node, map the DMA registers, and decode the DMA IRQs */
np = of_parse_phandle(op->dev.of_node, "llink-connected", 0);
if (!np) {
dev_err(&op->dev, "could not find DMA node\n");
rc = -ENODEV;
goto err_iounmap;
}
/* Setup the DMA register accesses, could be DCR or memory mapped */
if (temac_dcr_setup(lp, op, np)) {
/* no DCR in the device tree, try non-DCR */
lp->sdma_regs = of_iomap(np, 0);
if (lp->sdma_regs) {
lp->dma_in = temac_dma_in32;
lp->dma_out = temac_dma_out32;
dev_dbg(&op->dev, "MEM base: %p\n", lp->sdma_regs);
} else {
dev_err(&op->dev, "unable to map DMA registers\n");
of_node_put(np);
goto err_iounmap;
}
}
lp->rx_irq = irq_of_parse_and_map(np, 0);
lp->tx_irq = irq_of_parse_and_map(np, 1);
of_node_put(np); /* Finished with the DMA node; drop the reference */
if (!lp->rx_irq || !lp->tx_irq) {
dev_err(&op->dev, "could not determine irqs\n");
rc = -ENOMEM;
goto err_iounmap_2;
}
/* Retrieve the MAC address */
addr = of_get_property(op->dev.of_node, "local-mac-address", &size);
if ((!addr) || (size != 6)) {
dev_err(&op->dev, "could not find MAC address\n");
rc = -ENODEV;
goto err_iounmap_2;
}
temac_init_mac_address(ndev, (void *)addr);
rc = temac_mdio_setup(lp, op->dev.of_node);
if (rc)
dev_warn(&op->dev, "error registering MDIO bus\n");
lp->phy_node = of_parse_phandle(op->dev.of_node, "phy-handle", 0);
if (lp->phy_node)
dev_dbg(lp->dev, "using PHY node %s (%p)\n", np->full_name, np);
/* Add the device attributes */
rc = sysfs_create_group(&lp->dev->kobj, &temac_attr_group);
if (rc) {
dev_err(lp->dev, "Error creating sysfs files\n");
goto err_iounmap_2;
}
rc = register_netdev(lp->ndev);
if (rc) {
dev_err(lp->dev, "register_netdev() error (%i)\n", rc);
goto err_register_ndev;
}
return 0;
err_register_ndev:
sysfs_remove_group(&lp->dev->kobj, &temac_attr_group);
err_iounmap_2:
if (lp->sdma_regs)
iounmap(lp->sdma_regs);
err_iounmap:
iounmap(lp->regs);
nodev:
free_netdev(ndev);
ndev = NULL;
return rc;
}
static int temac_of_remove(struct platform_device *op)
{
struct net_device *ndev = platform_get_drvdata(op);
struct temac_local *lp = netdev_priv(ndev);
temac_mdio_teardown(lp);
unregister_netdev(ndev);
sysfs_remove_group(&lp->dev->kobj, &temac_attr_group);
of_node_put(lp->phy_node);
lp->phy_node = NULL;
iounmap(lp->regs);
if (lp->sdma_regs)
iounmap(lp->sdma_regs);
free_netdev(ndev);
return 0;
}
static struct of_device_id temac_of_match[] = {
{ .compatible = "xlnx,xps-ll-temac-1.01.b", },
{ .compatible = "xlnx,xps-ll-temac-2.00.a", },
{ .compatible = "xlnx,xps-ll-temac-2.02.a", },
{ .compatible = "xlnx,xps-ll-temac-2.03.a", },
{},
};
MODULE_DEVICE_TABLE(of, temac_of_match);
static struct platform_driver temac_of_driver = {
.probe = temac_of_probe,
.remove = temac_of_remove,
.driver = {
.name = "xilinx_temac",
.of_match_table = temac_of_match,
},
};
module_platform_driver(temac_of_driver);
MODULE_DESCRIPTION("Xilinx LL_TEMAC Ethernet driver");
MODULE_AUTHOR("Yoshio Kashiwagi");
MODULE_LICENSE("GPL");
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