forked from openwrt/openwrt
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ag71xx_main.c
1621 lines (1286 loc) · 37 KB
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ag71xx_main.c
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/*
* Atheros AR71xx built-in ethernet mac driver
*
* Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
* Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
*
* Based on Atheros' AG7100 driver
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*/
#include <linux/sizes.h>
#include <linux/of_net.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include "ag71xx.h"
#define AG71XX_DEFAULT_MSG_ENABLE \
(NETIF_MSG_DRV \
| NETIF_MSG_PROBE \
| NETIF_MSG_LINK \
| NETIF_MSG_TIMER \
| NETIF_MSG_IFDOWN \
| NETIF_MSG_IFUP \
| NETIF_MSG_RX_ERR \
| NETIF_MSG_TX_ERR)
static int ag71xx_msg_level = -1;
module_param_named(msg_level, ag71xx_msg_level, int, 0);
MODULE_PARM_DESC(msg_level, "Message level (-1=defaults,0=none,...,16=all)");
#define ETH_SWITCH_HEADER_LEN 2
static int ag71xx_tx_packets(struct ag71xx *ag, bool flush);
static inline unsigned int ag71xx_max_frame_len(unsigned int mtu)
{
return ETH_SWITCH_HEADER_LEN + ETH_HLEN + VLAN_HLEN + mtu + ETH_FCS_LEN;
}
static void ag71xx_dump_dma_regs(struct ag71xx *ag)
{
DBG("%s: dma_tx_ctrl=%08x, dma_tx_desc=%08x, dma_tx_status=%08x\n",
ag->dev->name,
ag71xx_rr(ag, AG71XX_REG_TX_CTRL),
ag71xx_rr(ag, AG71XX_REG_TX_DESC),
ag71xx_rr(ag, AG71XX_REG_TX_STATUS));
DBG("%s: dma_rx_ctrl=%08x, dma_rx_desc=%08x, dma_rx_status=%08x\n",
ag->dev->name,
ag71xx_rr(ag, AG71XX_REG_RX_CTRL),
ag71xx_rr(ag, AG71XX_REG_RX_DESC),
ag71xx_rr(ag, AG71XX_REG_RX_STATUS));
}
static void ag71xx_dump_regs(struct ag71xx *ag)
{
DBG("%s: mac_cfg1=%08x, mac_cfg2=%08x, ipg=%08x, hdx=%08x, mfl=%08x\n",
ag->dev->name,
ag71xx_rr(ag, AG71XX_REG_MAC_CFG1),
ag71xx_rr(ag, AG71XX_REG_MAC_CFG2),
ag71xx_rr(ag, AG71XX_REG_MAC_IPG),
ag71xx_rr(ag, AG71XX_REG_MAC_HDX),
ag71xx_rr(ag, AG71XX_REG_MAC_MFL));
DBG("%s: mac_ifctl=%08x, mac_addr1=%08x, mac_addr2=%08x\n",
ag->dev->name,
ag71xx_rr(ag, AG71XX_REG_MAC_IFCTL),
ag71xx_rr(ag, AG71XX_REG_MAC_ADDR1),
ag71xx_rr(ag, AG71XX_REG_MAC_ADDR2));
DBG("%s: fifo_cfg0=%08x, fifo_cfg1=%08x, fifo_cfg2=%08x\n",
ag->dev->name,
ag71xx_rr(ag, AG71XX_REG_FIFO_CFG0),
ag71xx_rr(ag, AG71XX_REG_FIFO_CFG1),
ag71xx_rr(ag, AG71XX_REG_FIFO_CFG2));
DBG("%s: fifo_cfg3=%08x, fifo_cfg4=%08x, fifo_cfg5=%08x\n",
ag->dev->name,
ag71xx_rr(ag, AG71XX_REG_FIFO_CFG3),
ag71xx_rr(ag, AG71XX_REG_FIFO_CFG4),
ag71xx_rr(ag, AG71XX_REG_FIFO_CFG5));
}
static inline void ag71xx_dump_intr(struct ag71xx *ag, char *label, u32 intr)
{
DBG("%s: %s intr=%08x %s%s%s%s%s%s\n",
ag->dev->name, label, intr,
(intr & AG71XX_INT_TX_PS) ? "TXPS " : "",
(intr & AG71XX_INT_TX_UR) ? "TXUR " : "",
(intr & AG71XX_INT_TX_BE) ? "TXBE " : "",
(intr & AG71XX_INT_RX_PR) ? "RXPR " : "",
(intr & AG71XX_INT_RX_OF) ? "RXOF " : "",
(intr & AG71XX_INT_RX_BE) ? "RXBE " : "");
}
static void ag71xx_ring_tx_clean(struct ag71xx *ag)
{
struct ag71xx_ring *ring = &ag->tx_ring;
struct net_device *dev = ag->dev;
int ring_mask = BIT(ring->order) - 1;
u32 bytes_compl = 0, pkts_compl = 0;
while (ring->curr != ring->dirty) {
struct ag71xx_desc *desc;
u32 i = ring->dirty & ring_mask;
desc = ag71xx_ring_desc(ring, i);
if (!ag71xx_desc_empty(desc)) {
desc->ctrl = 0;
dev->stats.tx_errors++;
}
if (ring->buf[i].skb) {
bytes_compl += ring->buf[i].len;
pkts_compl++;
dev_kfree_skb_any(ring->buf[i].skb);
}
ring->buf[i].skb = NULL;
ring->dirty++;
}
/* flush descriptors */
wmb();
netdev_completed_queue(dev, pkts_compl, bytes_compl);
}
static void ag71xx_ring_tx_init(struct ag71xx *ag)
{
struct ag71xx_ring *ring = &ag->tx_ring;
int ring_size = BIT(ring->order);
int ring_mask = ring_size - 1;
int i;
for (i = 0; i < ring_size; i++) {
struct ag71xx_desc *desc = ag71xx_ring_desc(ring, i);
desc->next = (u32) (ring->descs_dma +
AG71XX_DESC_SIZE * ((i + 1) & ring_mask));
desc->ctrl = DESC_EMPTY;
ring->buf[i].skb = NULL;
}
/* flush descriptors */
wmb();
ring->curr = 0;
ring->dirty = 0;
netdev_reset_queue(ag->dev);
}
static void ag71xx_ring_rx_clean(struct ag71xx *ag)
{
struct ag71xx_ring *ring = &ag->rx_ring;
int ring_size = BIT(ring->order);
int i;
if (!ring->buf)
return;
for (i = 0; i < ring_size; i++)
if (ring->buf[i].rx_buf) {
dma_unmap_single(&ag->dev->dev, ring->buf[i].dma_addr,
ag->rx_buf_size, DMA_FROM_DEVICE);
skb_free_frag(ring->buf[i].rx_buf);
}
}
static int ag71xx_buffer_size(struct ag71xx *ag)
{
return ag->rx_buf_size +
SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
}
static bool ag71xx_fill_rx_buf(struct ag71xx *ag, struct ag71xx_buf *buf,
int offset,
void *(*alloc)(unsigned int size))
{
struct ag71xx_ring *ring = &ag->rx_ring;
struct ag71xx_desc *desc = ag71xx_ring_desc(ring, buf - &ring->buf[0]);
void *data;
data = alloc(ag71xx_buffer_size(ag));
if (!data)
return false;
buf->rx_buf = data;
buf->dma_addr = dma_map_single(&ag->dev->dev, data, ag->rx_buf_size,
DMA_FROM_DEVICE);
desc->data = (u32) buf->dma_addr + offset;
return true;
}
static int ag71xx_ring_rx_init(struct ag71xx *ag)
{
struct ag71xx_ring *ring = &ag->rx_ring;
int ring_size = BIT(ring->order);
int ring_mask = BIT(ring->order) - 1;
unsigned int i;
int ret;
ret = 0;
for (i = 0; i < ring_size; i++) {
struct ag71xx_desc *desc = ag71xx_ring_desc(ring, i);
desc->next = (u32) (ring->descs_dma +
AG71XX_DESC_SIZE * ((i + 1) & ring_mask));
DBG("ag71xx: RX desc at %p, next is %08x\n",
desc, desc->next);
}
for (i = 0; i < ring_size; i++) {
struct ag71xx_desc *desc = ag71xx_ring_desc(ring, i);
if (!ag71xx_fill_rx_buf(ag, &ring->buf[i], ag->rx_buf_offset,
netdev_alloc_frag)) {
ret = -ENOMEM;
break;
}
desc->ctrl = DESC_EMPTY;
}
/* flush descriptors */
wmb();
ring->curr = 0;
ring->dirty = 0;
return ret;
}
static int ag71xx_ring_rx_refill(struct ag71xx *ag)
{
struct ag71xx_ring *ring = &ag->rx_ring;
int ring_mask = BIT(ring->order) - 1;
unsigned int count;
int offset = ag->rx_buf_offset;
count = 0;
for (; ring->curr - ring->dirty > 0; ring->dirty++) {
struct ag71xx_desc *desc;
unsigned int i;
i = ring->dirty & ring_mask;
desc = ag71xx_ring_desc(ring, i);
if (!ring->buf[i].rx_buf &&
!ag71xx_fill_rx_buf(ag, &ring->buf[i], offset,
napi_alloc_frag))
break;
desc->ctrl = DESC_EMPTY;
count++;
}
/* flush descriptors */
wmb();
DBG("%s: %u rx descriptors refilled\n", ag->dev->name, count);
return count;
}
static int ag71xx_rings_init(struct ag71xx *ag)
{
struct ag71xx_ring *tx = &ag->tx_ring;
struct ag71xx_ring *rx = &ag->rx_ring;
int ring_size = BIT(tx->order) + BIT(rx->order);
int tx_size = BIT(tx->order);
tx->buf = kzalloc(ring_size * sizeof(*tx->buf), GFP_KERNEL);
if (!tx->buf)
return -ENOMEM;
tx->descs_cpu = dma_alloc_coherent(NULL, ring_size * AG71XX_DESC_SIZE,
&tx->descs_dma, GFP_ATOMIC);
if (!tx->descs_cpu) {
kfree(tx->buf);
tx->buf = NULL;
return -ENOMEM;
}
rx->buf = &tx->buf[BIT(tx->order)];
rx->descs_cpu = ((void *)tx->descs_cpu) + tx_size * AG71XX_DESC_SIZE;
rx->descs_dma = tx->descs_dma + tx_size * AG71XX_DESC_SIZE;
ag71xx_ring_tx_init(ag);
return ag71xx_ring_rx_init(ag);
}
static void ag71xx_rings_free(struct ag71xx *ag)
{
struct ag71xx_ring *tx = &ag->tx_ring;
struct ag71xx_ring *rx = &ag->rx_ring;
int ring_size = BIT(tx->order) + BIT(rx->order);
if (tx->descs_cpu)
dma_free_coherent(NULL, ring_size * AG71XX_DESC_SIZE,
tx->descs_cpu, tx->descs_dma);
kfree(tx->buf);
tx->descs_cpu = NULL;
rx->descs_cpu = NULL;
tx->buf = NULL;
rx->buf = NULL;
}
static void ag71xx_rings_cleanup(struct ag71xx *ag)
{
ag71xx_ring_rx_clean(ag);
ag71xx_ring_tx_clean(ag);
ag71xx_rings_free(ag);
netdev_reset_queue(ag->dev);
}
static unsigned char *ag71xx_speed_str(struct ag71xx *ag)
{
switch (ag->speed) {
case SPEED_1000:
return "1000";
case SPEED_100:
return "100";
case SPEED_10:
return "10";
}
return "?";
}
static void ag71xx_hw_set_macaddr(struct ag71xx *ag, unsigned char *mac)
{
u32 t;
t = (((u32) mac[5]) << 24) | (((u32) mac[4]) << 16)
| (((u32) mac[3]) << 8) | ((u32) mac[2]);
ag71xx_wr(ag, AG71XX_REG_MAC_ADDR1, t);
t = (((u32) mac[1]) << 24) | (((u32) mac[0]) << 16);
ag71xx_wr(ag, AG71XX_REG_MAC_ADDR2, t);
}
static void ag71xx_dma_reset(struct ag71xx *ag)
{
u32 val;
int i;
ag71xx_dump_dma_regs(ag);
/* stop RX and TX */
ag71xx_wr(ag, AG71XX_REG_RX_CTRL, 0);
ag71xx_wr(ag, AG71XX_REG_TX_CTRL, 0);
/*
* give the hardware some time to really stop all rx/tx activity
* clearing the descriptors too early causes random memory corruption
*/
mdelay(1);
/* clear descriptor addresses */
ag71xx_wr(ag, AG71XX_REG_TX_DESC, ag->stop_desc_dma);
ag71xx_wr(ag, AG71XX_REG_RX_DESC, ag->stop_desc_dma);
/* clear pending RX/TX interrupts */
for (i = 0; i < 256; i++) {
ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_PR);
ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_PS);
}
/* clear pending errors */
ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_BE | RX_STATUS_OF);
ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_BE | TX_STATUS_UR);
val = ag71xx_rr(ag, AG71XX_REG_RX_STATUS);
if (val)
pr_alert("%s: unable to clear DMA Rx status: %08x\n",
ag->dev->name, val);
val = ag71xx_rr(ag, AG71XX_REG_TX_STATUS);
/* mask out reserved bits */
val &= ~0xff000000;
if (val)
pr_alert("%s: unable to clear DMA Tx status: %08x\n",
ag->dev->name, val);
ag71xx_dump_dma_regs(ag);
}
#define MAC_CFG1_INIT (MAC_CFG1_RXE | MAC_CFG1_TXE | \
MAC_CFG1_SRX | MAC_CFG1_STX)
#define FIFO_CFG0_INIT (FIFO_CFG0_ALL << FIFO_CFG0_ENABLE_SHIFT)
#define FIFO_CFG4_INIT (FIFO_CFG4_DE | FIFO_CFG4_DV | FIFO_CFG4_FC | \
FIFO_CFG4_CE | FIFO_CFG4_CR | FIFO_CFG4_LM | \
FIFO_CFG4_LO | FIFO_CFG4_OK | FIFO_CFG4_MC | \
FIFO_CFG4_BC | FIFO_CFG4_DR | FIFO_CFG4_LE | \
FIFO_CFG4_CF | FIFO_CFG4_PF | FIFO_CFG4_UO | \
FIFO_CFG4_VT)
#define FIFO_CFG5_INIT (FIFO_CFG5_DE | FIFO_CFG5_DV | FIFO_CFG5_FC | \
FIFO_CFG5_CE | FIFO_CFG5_LO | FIFO_CFG5_OK | \
FIFO_CFG5_MC | FIFO_CFG5_BC | FIFO_CFG5_DR | \
FIFO_CFG5_CF | FIFO_CFG5_PF | FIFO_CFG5_VT | \
FIFO_CFG5_LE | FIFO_CFG5_FT | FIFO_CFG5_16 | \
FIFO_CFG5_17 | FIFO_CFG5_SF)
static void ag71xx_hw_stop(struct ag71xx *ag)
{
/* disable all interrupts and stop the rx/tx engine */
ag71xx_wr(ag, AG71XX_REG_INT_ENABLE, 0);
ag71xx_wr(ag, AG71XX_REG_RX_CTRL, 0);
ag71xx_wr(ag, AG71XX_REG_TX_CTRL, 0);
}
static void ag71xx_hw_setup(struct ag71xx *ag)
{
struct device_node *np = ag->pdev->dev.of_node;
u32 init = MAC_CFG1_INIT;
/* setup MAC configuration registers */
if (of_property_read_bool(np, "flow-control"))
init |= MAC_CFG1_TFC | MAC_CFG1_RFC;
ag71xx_wr(ag, AG71XX_REG_MAC_CFG1, init);
ag71xx_sb(ag, AG71XX_REG_MAC_CFG2,
MAC_CFG2_PAD_CRC_EN | MAC_CFG2_LEN_CHECK);
/* setup max frame length to zero */
ag71xx_wr(ag, AG71XX_REG_MAC_MFL, 0);
/* setup FIFO configuration registers */
ag71xx_wr(ag, AG71XX_REG_FIFO_CFG0, FIFO_CFG0_INIT);
ag71xx_wr(ag, AG71XX_REG_FIFO_CFG1, ag->fifodata[0]);
ag71xx_wr(ag, AG71XX_REG_FIFO_CFG2, ag->fifodata[1]);
ag71xx_wr(ag, AG71XX_REG_FIFO_CFG4, FIFO_CFG4_INIT);
ag71xx_wr(ag, AG71XX_REG_FIFO_CFG5, FIFO_CFG5_INIT);
}
static void ag71xx_hw_init(struct ag71xx *ag)
{
ag71xx_hw_stop(ag);
ag71xx_sb(ag, AG71XX_REG_MAC_CFG1, MAC_CFG1_SR);
udelay(20);
reset_control_assert(ag->mac_reset);
msleep(100);
reset_control_deassert(ag->mac_reset);
msleep(200);
ag71xx_hw_setup(ag);
ag71xx_dma_reset(ag);
}
static void ag71xx_fast_reset(struct ag71xx *ag)
{
struct net_device *dev = ag->dev;
u32 rx_ds;
u32 mii_reg;
ag71xx_hw_stop(ag);
wmb();
mii_reg = ag71xx_rr(ag, AG71XX_REG_MII_CFG);
rx_ds = ag71xx_rr(ag, AG71XX_REG_RX_DESC);
ag71xx_tx_packets(ag, true);
reset_control_assert(ag->mac_reset);
udelay(10);
reset_control_deassert(ag->mac_reset);
udelay(10);
ag71xx_dma_reset(ag);
ag71xx_hw_setup(ag);
ag->tx_ring.curr = 0;
ag->tx_ring.dirty = 0;
netdev_reset_queue(ag->dev);
/* setup max frame length */
ag71xx_wr(ag, AG71XX_REG_MAC_MFL,
ag71xx_max_frame_len(ag->dev->mtu));
ag71xx_wr(ag, AG71XX_REG_RX_DESC, rx_ds);
ag71xx_wr(ag, AG71XX_REG_TX_DESC, ag->tx_ring.descs_dma);
ag71xx_wr(ag, AG71XX_REG_MII_CFG, mii_reg);
ag71xx_hw_set_macaddr(ag, dev->dev_addr);
}
static void ag71xx_hw_start(struct ag71xx *ag)
{
/* start RX engine */
ag71xx_wr(ag, AG71XX_REG_RX_CTRL, RX_CTRL_RXE);
/* enable interrupts */
ag71xx_wr(ag, AG71XX_REG_INT_ENABLE, AG71XX_INT_INIT);
netif_wake_queue(ag->dev);
}
static void ath79_set_pllval(struct ag71xx *ag)
{
u32 pll_reg = ag->pllreg[1];
u32 pll_val;
if (!ag->pllregmap)
return;
switch (ag->speed) {
case SPEED_10:
pll_val = ag->plldata[2];
break;
case SPEED_100:
pll_val = ag->plldata[1];
break;
case SPEED_1000:
pll_val = ag->plldata[0];
break;
default:
BUG();
}
if (pll_val)
regmap_write(ag->pllregmap, pll_reg, pll_val);
}
static void ath79_set_pll(struct ag71xx *ag)
{
u32 pll_cfg = ag->pllreg[0];
u32 pll_shift = ag->pllreg[2];
if (!ag->pllregmap)
return;
regmap_update_bits(ag->pllregmap, pll_cfg, 3 << pll_shift, 2 << pll_shift);
udelay(100);
ath79_set_pllval(ag);
regmap_update_bits(ag->pllregmap, pll_cfg, 3 << pll_shift, 3 << pll_shift);
udelay(100);
regmap_update_bits(ag->pllregmap, pll_cfg, 3 << pll_shift, 0);
udelay(100);
}
static void ath79_mii_ctrl_set_if(struct ag71xx *ag, unsigned int mii_if)
{
u32 t;
t = __raw_readl(ag->mii_base);
t &= ~(AR71XX_MII_CTRL_IF_MASK);
t |= (mii_if & AR71XX_MII_CTRL_IF_MASK);
__raw_writel(t, ag->mii_base);
}
static void ath79_mii0_ctrl_set_if(struct ag71xx *ag)
{
unsigned int mii_if;
switch (ag->phy_if_mode) {
case PHY_INTERFACE_MODE_MII:
mii_if = AR71XX_MII0_CTRL_IF_MII;
break;
case PHY_INTERFACE_MODE_GMII:
mii_if = AR71XX_MII0_CTRL_IF_GMII;
break;
case PHY_INTERFACE_MODE_RGMII:
mii_if = AR71XX_MII0_CTRL_IF_RGMII;
break;
case PHY_INTERFACE_MODE_RMII:
mii_if = AR71XX_MII0_CTRL_IF_RMII;
break;
default:
WARN(1, "Impossible PHY mode defined.\n");
return;
}
ath79_mii_ctrl_set_if(ag, mii_if);
}
static void ath79_mii1_ctrl_set_if(struct ag71xx *ag)
{
unsigned int mii_if;
switch (ag->phy_if_mode) {
case PHY_INTERFACE_MODE_RMII:
mii_if = AR71XX_MII1_CTRL_IF_RMII;
break;
case PHY_INTERFACE_MODE_RGMII:
mii_if = AR71XX_MII1_CTRL_IF_RGMII;
break;
default:
WARN(1, "Impossible PHY mode defined.\n");
return;
}
ath79_mii_ctrl_set_if(ag, mii_if);
}
static void ath79_mii_ctrl_set_speed(struct ag71xx *ag)
{
unsigned int mii_speed;
u32 t;
if (!ag->mii_base)
return;
switch (ag->speed) {
case SPEED_10:
mii_speed = AR71XX_MII_CTRL_SPEED_10;
break;
case SPEED_100:
mii_speed = AR71XX_MII_CTRL_SPEED_100;
break;
case SPEED_1000:
mii_speed = AR71XX_MII_CTRL_SPEED_1000;
break;
default:
BUG();
}
t = __raw_readl(ag->mii_base);
t &= ~(AR71XX_MII_CTRL_SPEED_MASK << AR71XX_MII_CTRL_SPEED_SHIFT);
t |= mii_speed << AR71XX_MII_CTRL_SPEED_SHIFT;
__raw_writel(t, ag->mii_base);
}
static void
__ag71xx_link_adjust(struct ag71xx *ag, bool update)
{
struct device_node *np = ag->pdev->dev.of_node;
u32 cfg2;
u32 ifctl;
u32 fifo5;
if (!ag->link && update) {
ag71xx_hw_stop(ag);
netif_carrier_off(ag->dev);
if (netif_msg_link(ag))
pr_info("%s: link down\n", ag->dev->name);
return;
}
if (!of_device_is_compatible(np, "qca,ar9130-eth") &&
!of_device_is_compatible(np, "qca,ar7100-eth"))
ag71xx_fast_reset(ag);
cfg2 = ag71xx_rr(ag, AG71XX_REG_MAC_CFG2);
cfg2 &= ~(MAC_CFG2_IF_1000 | MAC_CFG2_IF_10_100 | MAC_CFG2_FDX);
cfg2 |= (ag->duplex) ? MAC_CFG2_FDX : 0;
ifctl = ag71xx_rr(ag, AG71XX_REG_MAC_IFCTL);
ifctl &= ~(MAC_IFCTL_SPEED);
fifo5 = ag71xx_rr(ag, AG71XX_REG_FIFO_CFG5);
fifo5 &= ~FIFO_CFG5_BM;
switch (ag->speed) {
case SPEED_1000:
cfg2 |= MAC_CFG2_IF_1000;
fifo5 |= FIFO_CFG5_BM;
break;
case SPEED_100:
cfg2 |= MAC_CFG2_IF_10_100;
ifctl |= MAC_IFCTL_SPEED;
break;
case SPEED_10:
cfg2 |= MAC_CFG2_IF_10_100;
break;
default:
BUG();
return;
}
if (ag->tx_ring.desc_split) {
ag->fifodata[2] &= 0xffff;
ag->fifodata[2] |= ((2048 - ag->tx_ring.desc_split) / 4) << 16;
}
ag71xx_wr(ag, AG71XX_REG_FIFO_CFG3, ag->fifodata[2]);
if (update) {
if (of_device_is_compatible(np, "qca,ar7100-eth") ||
of_device_is_compatible(np, "qca,ar9130-eth")) {
ath79_set_pll(ag);
ath79_mii_ctrl_set_speed(ag);
} else if (of_device_is_compatible(np, "qca,ar7242-eth") ||
of_device_is_compatible(np, "qca,ar9340-eth") ||
of_device_is_compatible(np, "qca,qca9550-eth") ||
of_device_is_compatible(np, "qca,qca9560-eth")) {
ath79_set_pllval(ag);
}
}
ag71xx_wr(ag, AG71XX_REG_MAC_CFG2, cfg2);
ag71xx_wr(ag, AG71XX_REG_FIFO_CFG5, fifo5);
ag71xx_wr(ag, AG71XX_REG_MAC_IFCTL, ifctl);
if (of_device_is_compatible(np, "qca,qca9530-eth") ||
of_device_is_compatible(np, "qca,qca9560-eth")) {
/*
* The rx ring buffer can stall on small packets on QCA953x and
* QCA956x. Disabling the inline checksum engine fixes the stall.
* The wr, rr functions cannot be used since this hidden register
* is outside of the normal ag71xx register block.
*/
void __iomem *dam = ioremap_nocache(0xb90001bc, 0x4);
if (dam) {
__raw_writel(__raw_readl(dam) & ~BIT(27), dam);
(void)__raw_readl(dam);
iounmap(dam);
}
}
ag71xx_hw_start(ag);
netif_carrier_on(ag->dev);
if (update && netif_msg_link(ag))
pr_info("%s: link up (%sMbps/%s duplex)\n",
ag->dev->name,
ag71xx_speed_str(ag),
(DUPLEX_FULL == ag->duplex) ? "Full" : "Half");
ag71xx_dump_regs(ag);
}
void ag71xx_link_adjust(struct ag71xx *ag)
{
__ag71xx_link_adjust(ag, true);
}
static int ag71xx_hw_enable(struct ag71xx *ag)
{
int ret;
ret = ag71xx_rings_init(ag);
if (ret)
return ret;
napi_enable(&ag->napi);
ag71xx_wr(ag, AG71XX_REG_TX_DESC, ag->tx_ring.descs_dma);
ag71xx_wr(ag, AG71XX_REG_RX_DESC, ag->rx_ring.descs_dma);
netif_start_queue(ag->dev);
return 0;
}
static void ag71xx_hw_disable(struct ag71xx *ag)
{
unsigned long flags;
spin_lock_irqsave(&ag->lock, flags);
netif_stop_queue(ag->dev);
ag71xx_hw_stop(ag);
ag71xx_dma_reset(ag);
napi_disable(&ag->napi);
del_timer_sync(&ag->oom_timer);
spin_unlock_irqrestore(&ag->lock, flags);
ag71xx_rings_cleanup(ag);
}
static int ag71xx_open(struct net_device *dev)
{
struct ag71xx *ag = netdev_priv(dev);
unsigned int max_frame_len;
int ret;
netif_carrier_off(dev);
max_frame_len = ag71xx_max_frame_len(dev->mtu);
ag->rx_buf_size = SKB_DATA_ALIGN(max_frame_len + NET_SKB_PAD + NET_IP_ALIGN);
/* setup max frame length */
ag71xx_wr(ag, AG71XX_REG_MAC_MFL, max_frame_len);
ag71xx_hw_set_macaddr(ag, dev->dev_addr);
ret = ag71xx_hw_enable(ag);
if (ret)
goto err;
phy_start(ag->phy_dev);
return 0;
err:
ag71xx_rings_cleanup(ag);
return ret;
}
static int ag71xx_stop(struct net_device *dev)
{
unsigned long flags;
struct ag71xx *ag = netdev_priv(dev);
netif_carrier_off(dev);
phy_stop(ag->phy_dev);
spin_lock_irqsave(&ag->lock, flags);
if (ag->link) {
ag->link = 0;
ag71xx_link_adjust(ag);
}
spin_unlock_irqrestore(&ag->lock, flags);
ag71xx_hw_disable(ag);
return 0;
}
static int ag71xx_fill_dma_desc(struct ag71xx_ring *ring, u32 addr, int len)
{
int i;
struct ag71xx_desc *desc;
int ring_mask = BIT(ring->order) - 1;
int ndesc = 0;
int split = ring->desc_split;
if (!split)
split = len;
while (len > 0) {
unsigned int cur_len = len;
i = (ring->curr + ndesc) & ring_mask;
desc = ag71xx_ring_desc(ring, i);
if (!ag71xx_desc_empty(desc))
return -1;
if (cur_len > split) {
cur_len = split;
/*
* TX will hang if DMA transfers <= 4 bytes,
* make sure next segment is more than 4 bytes long.
*/
if (len <= split + 4)
cur_len -= 4;
}
desc->data = addr;
addr += cur_len;
len -= cur_len;
if (len > 0)
cur_len |= DESC_MORE;
/* prevent early tx attempt of this descriptor */
if (!ndesc)
cur_len |= DESC_EMPTY;
desc->ctrl = cur_len;
ndesc++;
}
return ndesc;
}
static netdev_tx_t ag71xx_hard_start_xmit(struct sk_buff *skb,
struct net_device *dev)
{
struct ag71xx *ag = netdev_priv(dev);
struct ag71xx_ring *ring = &ag->tx_ring;
int ring_mask = BIT(ring->order) - 1;
int ring_size = BIT(ring->order);
struct ag71xx_desc *desc;
dma_addr_t dma_addr;
int i, n, ring_min;
if (skb->len <= 4) {
DBG("%s: packet len is too small\n", ag->dev->name);
goto err_drop;
}
dma_addr = dma_map_single(&dev->dev, skb->data, skb->len,
DMA_TO_DEVICE);
i = ring->curr & ring_mask;
desc = ag71xx_ring_desc(ring, i);
/* setup descriptor fields */
n = ag71xx_fill_dma_desc(ring, (u32) dma_addr, skb->len & ag->desc_pktlen_mask);
if (n < 0)
goto err_drop_unmap;
i = (ring->curr + n - 1) & ring_mask;
ring->buf[i].len = skb->len;
ring->buf[i].skb = skb;
netdev_sent_queue(dev, skb->len);
skb_tx_timestamp(skb);
desc->ctrl &= ~DESC_EMPTY;
ring->curr += n;
/* flush descriptor */
wmb();
ring_min = 2;
if (ring->desc_split)
ring_min *= AG71XX_TX_RING_DS_PER_PKT;
if (ring->curr - ring->dirty >= ring_size - ring_min) {
DBG("%s: tx queue full\n", dev->name);
netif_stop_queue(dev);
}
DBG("%s: packet injected into TX queue\n", ag->dev->name);
/* enable TX engine */
ag71xx_wr(ag, AG71XX_REG_TX_CTRL, TX_CTRL_TXE);
return NETDEV_TX_OK;
err_drop_unmap:
dma_unmap_single(&dev->dev, dma_addr, skb->len, DMA_TO_DEVICE);
err_drop:
dev->stats.tx_dropped++;
dev_kfree_skb(skb);
return NETDEV_TX_OK;
}
static int ag71xx_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
struct ag71xx *ag = netdev_priv(dev);
int ret;
switch (cmd) {
case SIOCETHTOOL:
if (ag->phy_dev == NULL)
break;
spin_lock_irq(&ag->lock);
ret = phy_ethtool_ioctl(ag->phy_dev, (void *) ifr->ifr_data);
spin_unlock_irq(&ag->lock);
return ret;
case SIOCSIFHWADDR:
if (copy_from_user
(dev->dev_addr, ifr->ifr_data, sizeof(dev->dev_addr)))
return -EFAULT;
return 0;
case SIOCGIFHWADDR:
if (copy_to_user
(ifr->ifr_data, dev->dev_addr, sizeof(dev->dev_addr)))
return -EFAULT;
return 0;
case SIOCGMIIPHY:
case SIOCGMIIREG:
case SIOCSMIIREG:
if (ag->phy_dev == NULL)
break;
return phy_mii_ioctl(ag->phy_dev, ifr, cmd);
default:
break;
}
return -EOPNOTSUPP;
}
static void ag71xx_oom_timer_handler(unsigned long data)
{
struct net_device *dev = (struct net_device *) data;
struct ag71xx *ag = netdev_priv(dev);
napi_schedule(&ag->napi);
}
static void ag71xx_tx_timeout(struct net_device *dev)
{
struct ag71xx *ag = netdev_priv(dev);
if (netif_msg_tx_err(ag))
pr_info("%s: tx timeout\n", ag->dev->name);
schedule_delayed_work(&ag->restart_work, 1);
}