+/*
+ * 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 = BIT(ring->order) - 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->pdev->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->pdev->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(&ag->pdev->dev, ring_size * AG71XX_DESC_SIZE,
+ &tx->descs_dma, GFP_KERNEL);
+ if (!tx->descs_cpu) {
+ kfree(tx->buf);
+ tx->buf = NULL;
+ return -ENOMEM;
+ }
+
+ rx->buf = &tx->buf[tx_size];
+ 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(&ag->pdev->dev, 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);
+ if (ag->mdio_reset)
+ reset_control_assert(ag->mdio_reset);
+ msleep(100);
+ reset_control_deassert(ag->mac_reset);
+ if (ag->mdio_reset)
+ reset_control_deassert(ag->mdio_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 ag71xx_bit_set(void __iomem *reg, u32 bit)
+{
+ u32 val;
+
+ val = __raw_readl(reg) | bit;
+ __raw_writel(val, reg);
+ __raw_readl(reg);
+}
+
+static void ag71xx_bit_clear(void __iomem *reg, u32 bit)
+{
+ u32 val;
+
+ val = __raw_readl(reg) & ~bit;
+ __raw_writel(val, reg);
+ __raw_readl(reg);
+}
+
+static void ag71xx_sgmii_init_qca955x(struct device_node *np)
+{
+ struct device_node *np_dev;
+ void __iomem *gmac_base;
+ u32 mr_an_status;
+ u32 sgmii_status;
+ u8 tries = 0;
+ int err = 0;
+
+ np = of_get_child_by_name(np, "gmac-config");
+ if (!np)
+ return;
+
+ np_dev = of_parse_phandle(np, "device", 0);
+ if (!np_dev)
+ goto out;
+
+ gmac_base = of_iomap(np_dev, 0);
+ if (!gmac_base) {
+ pr_err("%pOF: can't map GMAC registers\n", np_dev);
+ err = -ENOMEM;
+ goto err_iomap;
+ }
+
+ mr_an_status = __raw_readl(gmac_base + QCA955X_GMAC_REG_MR_AN_STATUS);
+ if (!(mr_an_status & QCA955X_MR_AN_STATUS_AN_ABILITY))
+ goto sgmii_out;
+
+ /* SGMII reset sequence */
+ __raw_writel(QCA955X_SGMII_RESET_RX_CLK_N_RESET,
+ gmac_base + QCA955X_GMAC_REG_SGMII_RESET);
+ __raw_readl(gmac_base + QCA955X_GMAC_REG_SGMII_RESET);
+ udelay(10);
+
+ ag71xx_bit_set(gmac_base + QCA955X_GMAC_REG_SGMII_RESET,
+ QCA955X_SGMII_RESET_HW_RX_125M_N);
+ udelay(10);
+
+ ag71xx_bit_set(gmac_base + QCA955X_GMAC_REG_SGMII_RESET,
+ QCA955X_SGMII_RESET_RX_125M_N);
+ udelay(10);
+
+ ag71xx_bit_set(gmac_base + QCA955X_GMAC_REG_SGMII_RESET,
+ QCA955X_SGMII_RESET_TX_125M_N);
+ udelay(10);
+
+ ag71xx_bit_set(gmac_base + QCA955X_GMAC_REG_SGMII_RESET,
+ QCA955X_SGMII_RESET_RX_CLK_N);
+ udelay(10);
+
+ ag71xx_bit_set(gmac_base + QCA955X_GMAC_REG_SGMII_RESET,
+ QCA955X_SGMII_RESET_TX_CLK_N);
+ udelay(10);
+
+ /*
+ * The following is what QCA has to say about what happens here:
+ *
+ * Across resets SGMII link status goes to weird state.
+ * If SGMII_DEBUG register reads other than 0x1f or 0x10,
+ * we are for sure in a bad state.
+ *
+ * Issue a PHY reset in MR_AN_CONTROL to keep going.
+ */
+ do {
+ ag71xx_bit_set(gmac_base + QCA955X_GMAC_REG_MR_AN_CONTROL,
+ QCA955X_MR_AN_CONTROL_PHY_RESET |
+ QCA955X_MR_AN_CONTROL_AN_ENABLE);
+ udelay(200);
+ ag71xx_bit_clear(gmac_base + QCA955X_GMAC_REG_MR_AN_CONTROL,
+ QCA955X_MR_AN_CONTROL_PHY_RESET);
+ mdelay(300);
+ sgmii_status = __raw_readl(gmac_base + QCA955X_GMAC_REG_SGMII_DEBUG) &
+ QCA955X_SGMII_DEBUG_TX_STATE_MASK;
+
+ if (tries++ >= 20) {
+ pr_err("ag71xx: max retries for SGMII fixup exceeded\n");
+ break;
+ }
+ } while (!(sgmii_status == 0xf || sgmii_status == 0x10));
+
+sgmii_out:
+ iounmap(gmac_base);
+err_iomap:
+ of_node_put(np_dev);
+out:
+ of_node_put(np);
+}
+
+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:
+ case PHY_INTERFACE_MODE_RGMII_ID:
+ 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:
+ case PHY_INTERFACE_MODE_RGMII_ID:
+ 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);
+ if (of_property_read_bool(np, "qca955x-sgmii-fixup"))
+ ag71xx_sgmii_init_qca955x(np);
+ }
+ }
+
+ 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)
+{
+ netif_stop_queue(ag->dev);
+
+ ag71xx_hw_stop(ag);
+ ag71xx_dma_reset(ag);
+
+ napi_disable(&ag->napi);
+ del_timer_sync(&ag->oom_timer);
+
+ 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(&ag->pdev->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(&ag->pdev->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);
+
+
+ switch (cmd) {
+ 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;
+}
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(4,15,0))
+static void ag71xx_oom_timer_handler(unsigned long data)
+{
+ struct net_device *dev = (struct net_device *) data;
+ struct ag71xx *ag = netdev_priv(dev);
+#else
+static void ag71xx_oom_timer_handler(struct timer_list *t)
+{
+ struct ag71xx *ag = from_timer(ag, t, oom_timer);
+#endif
+
+ 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);
+}
+
+static void ag71xx_restart_work_func(struct work_struct *work)
+{
+ struct ag71xx *ag = container_of(work, struct ag71xx, restart_work.work);
+
+ rtnl_lock();
+ ag71xx_hw_disable(ag);
+ ag71xx_hw_enable(ag);
+ if (ag->link)
+ __ag71xx_link_adjust(ag, false);
+ rtnl_unlock();
+}
+
+static bool ag71xx_check_dma_stuck(struct ag71xx *ag)
+{
+ unsigned long timestamp;
+ u32 rx_sm, tx_sm, rx_fd;
+
+ timestamp = netdev_get_tx_queue(ag->dev, 0)->trans_start;
+ if (likely(time_before(jiffies, timestamp + HZ/10)))
+ return false;
+
+ if (!netif_carrier_ok(ag->dev))
+ return false;
+
+ rx_sm = ag71xx_rr(ag, AG71XX_REG_RX_SM);
+ if ((rx_sm & 0x7) == 0x3 && ((rx_sm >> 4) & 0x7) == 0x6)
+ return true;
+
+ tx_sm = ag71xx_rr(ag, AG71XX_REG_TX_SM);
+ rx_fd = ag71xx_rr(ag, AG71XX_REG_FIFO_DEPTH);
+ if (((tx_sm >> 4) & 0x7) == 0 && ((rx_sm & 0x7) == 0) &&
+ ((rx_sm >> 4) & 0x7) == 0 && rx_fd == 0)
+ return true;
+
+ return false;
+}
+
+static int ag71xx_tx_packets(struct ag71xx *ag, bool flush)
+{
+ struct ag71xx_ring *ring = &ag->tx_ring;
+ bool dma_stuck = false;
+ int ring_mask = BIT(ring->order) - 1;
+ int ring_size = BIT(ring->order);
+ int sent = 0;
+ int bytes_compl = 0;
+ int n = 0;
+
+ DBG("%s: processing TX ring\n", ag->dev->name);
+
+ while (ring->dirty + n != ring->curr) {
+ unsigned int i = (ring->dirty + n) & ring_mask;
+ struct ag71xx_desc *desc = ag71xx_ring_desc(ring, i);
+ struct sk_buff *skb = ring->buf[i].skb;
+
+ if (!flush && !ag71xx_desc_empty(desc)) {
+ if (ag->tx_hang_workaround &&
+ ag71xx_check_dma_stuck(ag)) {
+ schedule_delayed_work(&ag->restart_work, HZ / 2);
+ dma_stuck = true;
+ }
+ break;
+ }
+
+ if (flush)
+ desc->ctrl |= DESC_EMPTY;
+
+ n++;
+ if (!skb)
+ continue;
+
+ dev_kfree_skb_any(skb);
+ ring->buf[i].skb = NULL;
+
+ bytes_compl += ring->buf[i].len;
+
+ sent++;
+ ring->dirty += n;
+
+ while (n > 0) {
+ ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_PS);
+ n--;
+ }
+ }
+
+ DBG("%s: %d packets sent out\n", ag->dev->name, sent);
+
+ if (!sent)
+ return 0;
+
+ ag->dev->stats.tx_bytes += bytes_compl;
+ ag->dev->stats.tx_packets += sent;
+
+ netdev_completed_queue(ag->dev, sent, bytes_compl);
+ if ((ring->curr - ring->dirty) < (ring_size * 3) / 4)
+ netif_wake_queue(ag->dev);
+
+ if (!dma_stuck)
+ cancel_delayed_work(&ag->restart_work);
+
+ return sent;
+}
+
+static int ag71xx_rx_packets(struct ag71xx *ag, int limit)
+{
+ struct net_device *dev = ag->dev;
+ struct ag71xx_ring *ring = &ag->rx_ring;
+ unsigned int pktlen_mask = ag->desc_pktlen_mask;
+ unsigned int offset = ag->rx_buf_offset;
+ int ring_mask = BIT(ring->order) - 1;
+ int ring_size = BIT(ring->order);
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,19,0))
+ struct list_head rx_list;
+ struct sk_buff *next;
+#else
+ struct sk_buff_head queue;
+#endif
+ struct sk_buff *skb;
+ int done = 0;
+
+ DBG("%s: rx packets, limit=%d, curr=%u, dirty=%u\n",
+ dev->name, limit, ring->curr, ring->dirty);
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,19,0))
+ INIT_LIST_HEAD(&rx_list);
+#else
+ skb_queue_head_init(&queue);
+#endif
+
+ while (done < limit) {
+ unsigned int i = ring->curr & ring_mask;
+ struct ag71xx_desc *desc = ag71xx_ring_desc(ring, i);
+ int pktlen;
+ int err = 0;
+
+ if (ag71xx_desc_empty(desc))
+ break;
+
+ if ((ring->dirty + ring_size) == ring->curr) {
+ ag71xx_assert(0);
+ break;
+ }
+
+ ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_PR);
+
+ pktlen = desc->ctrl & pktlen_mask;
+ pktlen -= ETH_FCS_LEN;
+
+ dma_unmap_single(&ag->pdev->dev, ring->buf[i].dma_addr,
+ ag->rx_buf_size, DMA_FROM_DEVICE);
+
+ dev->stats.rx_packets++;
+ dev->stats.rx_bytes += pktlen;
+
+ skb = build_skb(ring->buf[i].rx_buf, ag71xx_buffer_size(ag));
+ if (!skb) {
+ skb_free_frag(ring->buf[i].rx_buf);
+ goto next;
+ }
+
+ skb_reserve(skb, offset);
+ skb_put(skb, pktlen);
+
+ if (err) {
+ dev->stats.rx_dropped++;
+ kfree_skb(skb);
+ } else {
+ skb->dev = dev;
+ skb->ip_summed = CHECKSUM_NONE;
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,19,0))
+ list_add_tail(&skb->list, &rx_list);
+#else
+ __skb_queue_tail(&queue, skb);
+#endif
+ }
+
+next:
+ ring->buf[i].rx_buf = NULL;
+ done++;
+
+ ring->curr++;
+ }
+
+ ag71xx_ring_rx_refill(ag);
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,19,0))
+ list_for_each_entry_safe(skb, next, &rx_list, list)
+ skb->protocol = eth_type_trans(skb, dev);
+ netif_receive_skb_list(&rx_list);
+#else
+ while ((skb = __skb_dequeue(&queue)) != NULL) {
+ skb->protocol = eth_type_trans(skb, dev);
+ netif_receive_skb(skb);
+ }
+#endif
+
+ DBG("%s: rx finish, curr=%u, dirty=%u, done=%d\n",
+ dev->name, ring->curr, ring->dirty, done);
+
+ return done;
+}
+
+static int ag71xx_poll(struct napi_struct *napi, int limit)
+{
+ struct ag71xx *ag = container_of(napi, struct ag71xx, napi);
+ struct net_device *dev = ag->dev;
+ struct ag71xx_ring *rx_ring = &ag->rx_ring;
+ int rx_ring_size = BIT(rx_ring->order);
+ unsigned long flags;
+ u32 status;
+ int tx_done;
+ int rx_done;
+
+ tx_done = ag71xx_tx_packets(ag, false);
+
+ DBG("%s: processing RX ring\n", dev->name);
+ rx_done = ag71xx_rx_packets(ag, limit);
+
+ ag71xx_debugfs_update_napi_stats(ag, rx_done, tx_done);
+
+ if (rx_ring->buf[rx_ring->dirty % rx_ring_size].rx_buf == NULL)
+ goto oom;
+
+ status = ag71xx_rr(ag, AG71XX_REG_RX_STATUS);
+ if (unlikely(status & RX_STATUS_OF)) {
+ ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_OF);
+ dev->stats.rx_fifo_errors++;
+
+ /* restart RX */
+ ag71xx_wr(ag, AG71XX_REG_RX_CTRL, RX_CTRL_RXE);
+ }
+
+ if (rx_done < limit) {
+ if (status & RX_STATUS_PR)
+ goto more;
+
+ status = ag71xx_rr(ag, AG71XX_REG_TX_STATUS);
+ if (status & TX_STATUS_PS)
+ goto more;
+
+ DBG("%s: disable polling mode, rx=%d, tx=%d,limit=%d\n",
+ dev->name, rx_done, tx_done, limit);
+
+ napi_complete(napi);
+
+ /* enable interrupts */
+ spin_lock_irqsave(&ag->lock, flags);
+ ag71xx_int_enable(ag, AG71XX_INT_POLL);
+ spin_unlock_irqrestore(&ag->lock, flags);
+ return rx_done;
+ }
+
+more:
+ DBG("%s: stay in polling mode, rx=%d, tx=%d, limit=%d\n",
+ dev->name, rx_done, tx_done, limit);
+ return limit;
+
+oom:
+ if (netif_msg_rx_err(ag))
+ pr_info("%s: out of memory\n", dev->name);
+
+ mod_timer(&ag->oom_timer, jiffies + AG71XX_OOM_REFILL);
+ napi_complete(napi);
+ return 0;
+}
+
+static irqreturn_t ag71xx_interrupt(int irq, void *dev_id)
+{
+ struct net_device *dev = dev_id;
+ struct ag71xx *ag = netdev_priv(dev);
+ u32 status;
+
+ status = ag71xx_rr(ag, AG71XX_REG_INT_STATUS);
+ ag71xx_dump_intr(ag, "raw", status);
+
+ if (unlikely(!status))
+ return IRQ_NONE;
+
+ if (unlikely(status & AG71XX_INT_ERR)) {
+ if (status & AG71XX_INT_TX_BE) {
+ ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_BE);
+ dev_err(&dev->dev, "TX BUS error\n");
+ }
+ if (status & AG71XX_INT_RX_BE) {
+ ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_BE);
+ dev_err(&dev->dev, "RX BUS error\n");
+ }
+ }
+
+ if (likely(status & AG71XX_INT_POLL)) {
+ ag71xx_int_disable(ag, AG71XX_INT_POLL);
+ DBG("%s: enable polling mode\n", dev->name);
+ napi_schedule(&ag->napi);
+ }
+
+ ag71xx_debugfs_update_int_stats(ag, status);
+
+ return IRQ_HANDLED;
+}
+
+static int ag71xx_change_mtu(struct net_device *dev, int new_mtu)
+{
+ struct ag71xx *ag = netdev_priv(dev);
+
+ dev->mtu = new_mtu;
+ ag71xx_wr(ag, AG71XX_REG_MAC_MFL,
+ ag71xx_max_frame_len(dev->mtu));
+
+ return 0;
+}
+
+static const struct net_device_ops ag71xx_netdev_ops = {
+ .ndo_open = ag71xx_open,
+ .ndo_stop = ag71xx_stop,
+ .ndo_start_xmit = ag71xx_hard_start_xmit,
+ .ndo_do_ioctl = ag71xx_do_ioctl,
+ .ndo_tx_timeout = ag71xx_tx_timeout,
+ .ndo_change_mtu = ag71xx_change_mtu,
+ .ndo_set_mac_address = eth_mac_addr,
+ .ndo_validate_addr = eth_validate_addr,
+};
+
+static int ag71xx_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct net_device *dev;
+ struct resource *res;
+ struct ag71xx *ag;
+ const void *mac_addr;
+ u32 max_frame_len;
+ int tx_size, err;
+
+ if (!np)
+ return -ENODEV;
+
+ dev = devm_alloc_etherdev(&pdev->dev, sizeof(*ag));
+ if (!dev)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -EINVAL;
+
+ err = ag71xx_setup_gmac(np);
+ if (err)
+ return err;
+
+ SET_NETDEV_DEV(dev, &pdev->dev);
+
+ ag = netdev_priv(dev);
+ ag->pdev = pdev;
+ ag->dev = dev;
+ ag->msg_enable = netif_msg_init(ag71xx_msg_level,
+ AG71XX_DEFAULT_MSG_ENABLE);
+ spin_lock_init(&ag->lock);
+
+ ag->mac_reset = devm_reset_control_get_exclusive(&pdev->dev, "mac");
+ if (IS_ERR(ag->mac_reset)) {
+ dev_err(&pdev->dev, "missing mac reset\n");
+ return PTR_ERR(ag->mac_reset);
+ }
+
+ ag->mdio_reset = devm_reset_control_get_optional_exclusive(&pdev->dev, "mdio");
+
+ if (of_property_read_u32_array(np, "fifo-data", ag->fifodata, 3)) {
+ if (of_device_is_compatible(np, "qca,ar9130-eth") ||
+ of_device_is_compatible(np, "qca,ar7100-eth")) {
+ ag->fifodata[0] = 0x0fff0000;
+ ag->fifodata[1] = 0x00001fff;
+ } else {
+ ag->fifodata[0] = 0x0010ffff;
+ ag->fifodata[1] = 0x015500aa;
+ ag->fifodata[2] = 0x01f00140;
+ }
+ if (of_device_is_compatible(np, "qca,ar9130-eth"))
+ ag->fifodata[2] = 0x00780fff;
+ else if (of_device_is_compatible(np, "qca,ar7100-eth"))
+ ag->fifodata[2] = 0x008001ff;
+ }
+
+ if (of_property_read_u32_array(np, "pll-data", ag->plldata, 3))
+ dev_dbg(&pdev->dev, "failed to read pll-data property\n");
+
+ if (of_property_read_u32_array(np, "pll-reg", ag->pllreg, 3))
+ dev_dbg(&pdev->dev, "failed to read pll-reg property\n");
+
+ ag->pllregmap = syscon_regmap_lookup_by_phandle(np, "pll-handle");
+ if (IS_ERR(ag->pllregmap)) {
+ dev_dbg(&pdev->dev, "failed to read pll-handle property\n");
+ ag->pllregmap = NULL;
+ }
+
+ ag->mac_base = devm_ioremap_nocache(&pdev->dev, res->start,
+ res->end - res->start + 1);
+ if (!ag->mac_base)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (res) {
+ ag->mii_base = devm_ioremap_nocache(&pdev->dev, res->start,
+ res->end - res->start + 1);
+ if (!ag->mii_base)
+ return -ENOMEM;
+ }
+
+ dev->irq = platform_get_irq(pdev, 0);
+ err = devm_request_irq(&pdev->dev, dev->irq, ag71xx_interrupt,
+ 0x0, dev_name(&pdev->dev), dev);
+ if (err) {
+ dev_err(&pdev->dev, "unable to request IRQ %d\n", dev->irq);
+ return err;
+ }
+
+ dev->netdev_ops = &ag71xx_netdev_ops;
+ dev->ethtool_ops = &ag71xx_ethtool_ops;
+
+ INIT_DELAYED_WORK(&ag->restart_work, ag71xx_restart_work_func);
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(4,15,0))
+ init_timer(&ag->oom_timer);
+ ag->oom_timer.data = (unsigned long) dev;
+ ag->oom_timer.function = ag71xx_oom_timer_handler;
+#else
+ timer_setup(&ag->oom_timer, ag71xx_oom_timer_handler, 0);
+#endif
+
+ tx_size = AG71XX_TX_RING_SIZE_DEFAULT;
+ ag->rx_ring.order = ag71xx_ring_size_order(AG71XX_RX_RING_SIZE_DEFAULT);
+
+ if (of_device_is_compatible(np, "qca,ar9340-eth") ||
+ of_device_is_compatible(np, "qca,qca9530-eth") ||
+ of_device_is_compatible(np, "qca,qca9550-eth") ||
+ of_device_is_compatible(np, "qca,qca9560-eth"))
+ ag->desc_pktlen_mask = SZ_16K - 1;
+ else
+ ag->desc_pktlen_mask = SZ_4K - 1;
+
+ if (ag->desc_pktlen_mask == SZ_16K - 1 &&
+ !of_device_is_compatible(np, "qca,qca9550-eth") &&
+ !of_device_is_compatible(np, "qca,qca9560-eth"))
+ max_frame_len = ag->desc_pktlen_mask;
+ else
+ max_frame_len = 1540;
+
+ dev->min_mtu = 68;
+ dev->max_mtu = max_frame_len - ag71xx_max_frame_len(0);
+
+ if (of_device_is_compatible(np, "qca,ar7240-eth") ||
+ of_device_is_compatible(np, "qca,ar7241-eth") ||
+ of_device_is_compatible(np, "qca,ar7242-eth") ||
+ of_device_is_compatible(np, "qca,ar9330-eth") ||
+ of_device_is_compatible(np, "qca,ar9340-eth") ||
+ of_device_is_compatible(np, "qca,qca9530-eth") ||
+ of_device_is_compatible(np, "qca,qca9550-eth") ||
+ of_device_is_compatible(np, "qca,qca9560-eth"))
+ ag->tx_hang_workaround = 1;
+
+ ag->rx_buf_offset = NET_SKB_PAD;
+ if (!of_device_is_compatible(np, "qca,ar7100-eth") &&
+ !of_device_is_compatible(np, "qca,ar9130-eth"))
+ ag->rx_buf_offset += NET_IP_ALIGN;
+
+ if (of_device_is_compatible(np, "qca,ar7100-eth")) {
+ ag->tx_ring.desc_split = AG71XX_TX_RING_SPLIT;
+ tx_size *= AG71XX_TX_RING_DS_PER_PKT;
+ }
+ ag->tx_ring.order = ag71xx_ring_size_order(tx_size);
+
+ ag->stop_desc = dmam_alloc_coherent(&pdev->dev,
+ sizeof(struct ag71xx_desc),
+ &ag->stop_desc_dma, GFP_KERNEL);
+ if (!ag->stop_desc)
+ return -ENOMEM;
+
+ ag->stop_desc->data = 0;
+ ag->stop_desc->ctrl = 0;
+ ag->stop_desc->next = (u32) ag->stop_desc_dma;
+
+ mac_addr = of_get_mac_address(np);
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(5,2,0))
+ if (!mac_addr || !is_valid_ether_addr(mac_addr)) {
+#else
+ if (IS_ERR(mac_addr) || !is_valid_ether_addr(mac_addr)) {
+#endif
+ dev_err(&pdev->dev, "invalid MAC address, using random address\n");
+ eth_random_addr(dev->dev_addr);
+ } else {
+ memcpy(dev->dev_addr, mac_addr, ETH_ALEN);
+ }
+
+ ag->phy_if_mode = of_get_phy_mode(np);
+ if (ag->phy_if_mode < 0) {
+ dev_err(&pdev->dev, "missing phy-mode property in DT\n");
+ return ag->phy_if_mode;
+ }
+
+ if (of_property_read_u32(np, "qca,mac-idx", &ag->mac_idx))
+ ag->mac_idx = -1;
+ if (ag->mii_base)
+ switch (ag->mac_idx) {
+ case 0:
+ ath79_mii0_ctrl_set_if(ag);
+ break;
+ case 1:
+ ath79_mii1_ctrl_set_if(ag);
+ break;
+ default:
+ break;
+ }
+
+ netif_napi_add(dev, &ag->napi, ag71xx_poll, AG71XX_NAPI_WEIGHT);
+
+ ag71xx_dump_regs(ag);
+
+ ag71xx_wr(ag, AG71XX_REG_MAC_CFG1, 0);
+
+ ag71xx_hw_init(ag);
+
+ ag71xx_dump_regs(ag);
+
+ /*
+ * populate current node to register mdio-bus as a subdevice.
+ * the mdio bus works independently on ar7241 and later chips
+ * and we need to load mdio1 before gmac0, which can be done
+ * by adding a "simple-mfd" compatible to gmac node. The
+ * following code checks OF_POPULATED_BUS flag before populating
+ * to avoid duplicated population.
+ */
+ if (!of_node_check_flag(np, OF_POPULATED_BUS)) {
+ err = of_platform_populate(np, NULL, NULL, &pdev->dev);
+ if (err)
+ return err;
+ }
+
+ err = ag71xx_phy_connect(ag);
+ if (err)
+ return err;
+
+ err = ag71xx_debugfs_init(ag);
+ if (err)
+ goto err_phy_disconnect;
+
+ platform_set_drvdata(pdev, dev);
+
+ err = register_netdev(dev);
+ if (err) {
+ dev_err(&pdev->dev, "unable to register net device\n");
+ platform_set_drvdata(pdev, NULL);
+ ag71xx_debugfs_exit(ag);
+ goto err_phy_disconnect;
+ }
+
+ pr_info("%s: Atheros AG71xx at 0x%08lx, irq %d, mode: %s\n",
+ dev->name, (unsigned long) ag->mac_base, dev->irq,
+ phy_modes(ag->phy_if_mode));
+
+ return 0;
+
+err_phy_disconnect:
+ ag71xx_phy_disconnect(ag);
+ return err;
+}
+
+static int ag71xx_remove(struct platform_device *pdev)
+{
+ struct net_device *dev = platform_get_drvdata(pdev);
+ struct ag71xx *ag;
+
+ if (!dev)
+ return 0;
+
+ ag = netdev_priv(dev);
+ ag71xx_debugfs_exit(ag);
+ ag71xx_phy_disconnect(ag);
+ unregister_netdev(dev);
+ platform_set_drvdata(pdev, NULL);
+ return 0;
+}
+
+static const struct of_device_id ag71xx_match[] = {
+ { .compatible = "qca,ar7100-eth" },
+ { .compatible = "qca,ar7240-eth" },
+ { .compatible = "qca,ar7241-eth" },
+ { .compatible = "qca,ar7242-eth" },
+ { .compatible = "qca,ar9130-eth" },
+ { .compatible = "qca,ar9330-eth" },
+ { .compatible = "qca,ar9340-eth" },
+ { .compatible = "qca,qca9530-eth" },
+ { .compatible = "qca,qca9550-eth" },
+ { .compatible = "qca,qca9560-eth" },
+ {}
+};
+
+static struct platform_driver ag71xx_driver = {
+ .probe = ag71xx_probe,
+ .remove = ag71xx_remove,
+ .driver = {
+ .name = AG71XX_DRV_NAME,
+ .of_match_table = ag71xx_match,
+ }
+};
+
+static int __init ag71xx_module_init(void)
+{
+ int ret;
+
+ ret = ag71xx_debugfs_root_init();
+ if (ret)
+ goto err_out;
+
+ ret = platform_driver_register(&ag71xx_driver);
+ if (ret)
+ goto err_debugfs_exit;
+
+ return 0;
+
+err_debugfs_exit:
+ ag71xx_debugfs_root_exit();
+err_out:
+ return ret;
+}
+
+static void __exit ag71xx_module_exit(void)
+{
+ platform_driver_unregister(&ag71xx_driver);
+ ag71xx_debugfs_root_exit();
+}
+
+module_init(ag71xx_module_init);
+module_exit(ag71xx_module_exit);
+
+MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
+MODULE_AUTHOR("Imre Kaloz <kaloz@openwrt.org>");
+MODULE_AUTHOR("Felix Fietkau <nbd@nbd.name>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" AG71XX_DRV_NAME);