--- /dev/null
+/*
+ * ks8842.c timberdale KS8842 ethernet driver
+ * Copyright (c) 2009 Intel Corporation
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/* Supports:
+ * The Micrel KS8842 behind the timberdale FPGA
+ * The genuine Micrel KS8841/42 device with ISA 16/32bit bus interface
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/ks8842.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/scatterlist.h>
+
+#define DRV_NAME "ks8842"
+
+/* Timberdale specific Registers */
+#define REG_TIMB_RST 0x1c
+#define REG_TIMB_FIFO 0x20
+#define REG_TIMB_ISR 0x24
+#define REG_TIMB_IER 0x28
+#define REG_TIMB_IAR 0x2C
+#define REQ_TIMB_DMA_RESUME 0x30
+
+/* KS8842 registers */
+
+#define REG_SELECT_BANK 0x0e
+
+/* bank 0 registers */
+#define REG_QRFCR 0x04
+
+/* bank 2 registers */
+#define REG_MARL 0x00
+#define REG_MARM 0x02
+#define REG_MARH 0x04
+
+/* bank 3 registers */
+#define REG_GRR 0x06
+
+/* bank 16 registers */
+#define REG_TXCR 0x00
+#define REG_TXSR 0x02
+#define REG_RXCR 0x04
+#define REG_TXMIR 0x08
+#define REG_RXMIR 0x0A
+
+/* bank 17 registers */
+#define REG_TXQCR 0x00
+#define REG_RXQCR 0x02
+#define REG_TXFDPR 0x04
+#define REG_RXFDPR 0x06
+#define REG_QMU_DATA_LO 0x08
+#define REG_QMU_DATA_HI 0x0A
+
+/* bank 18 registers */
+#define REG_IER 0x00
+#define IRQ_LINK_CHANGE 0x8000
+#define IRQ_TX 0x4000
+#define IRQ_RX 0x2000
+#define IRQ_RX_OVERRUN 0x0800
+#define IRQ_TX_STOPPED 0x0200
+#define IRQ_RX_STOPPED 0x0100
+#define IRQ_RX_ERROR 0x0080
+#define ENABLED_IRQS (IRQ_LINK_CHANGE | IRQ_TX | IRQ_RX | IRQ_RX_STOPPED | \
+ IRQ_TX_STOPPED | IRQ_RX_OVERRUN | IRQ_RX_ERROR)
+/* When running via timberdale in DMA mode, the RX interrupt should be
+ enabled in the KS8842, but not in the FPGA IP, since the IP handles
+ RX DMA internally.
+ TX interrupts are not needed it is handled by the FPGA the driver is
+ notified via DMA callbacks.
+*/
+#define ENABLED_IRQS_DMA_IP (IRQ_LINK_CHANGE | IRQ_RX_STOPPED | \
+ IRQ_TX_STOPPED | IRQ_RX_OVERRUN | IRQ_RX_ERROR)
+#define ENABLED_IRQS_DMA (ENABLED_IRQS_DMA_IP | IRQ_RX)
+#define REG_ISR 0x02
+#define REG_RXSR 0x04
+#define RXSR_VALID 0x8000
+#define RXSR_BROADCAST 0x80
+#define RXSR_MULTICAST 0x40
+#define RXSR_UNICAST 0x20
+#define RXSR_FRAMETYPE 0x08
+#define RXSR_TOO_LONG 0x04
+#define RXSR_RUNT 0x02
+#define RXSR_CRC_ERROR 0x01
+#define RXSR_ERROR (RXSR_TOO_LONG | RXSR_RUNT | RXSR_CRC_ERROR)
+
+/* bank 32 registers */
+#define REG_SW_ID_AND_ENABLE 0x00
+#define REG_SGCR1 0x02
+#define REG_SGCR2 0x04
+#define REG_SGCR3 0x06
+
+/* bank 39 registers */
+#define REG_MACAR1 0x00
+#define REG_MACAR2 0x02
+#define REG_MACAR3 0x04
+
+/* bank 45 registers */
+#define REG_P1MBCR 0x00
+#define REG_P1MBSR 0x02
+
+/* bank 46 registers */
+#define REG_P2MBCR 0x00
+#define REG_P2MBSR 0x02
+
+/* bank 48 registers */
+#define REG_P1CR2 0x02
+
+/* bank 49 registers */
+#define REG_P1CR4 0x02
+#define REG_P1SR 0x04
+
+/* flags passed by platform_device for configuration */
+#define MICREL_KS884X 0x01 /* 0=Timeberdale(FPGA), 1=Micrel */
+#define KS884X_16BIT 0x02 /* 1=16bit, 0=32bit */
+
+#define DMA_BUFFER_SIZE 2048
+
+struct ks8842_tx_dma_ctl {
+ struct dma_chan *chan;
+ struct dma_async_tx_descriptor *adesc;
+ void *buf;
+ struct scatterlist sg;
+ int channel;
+};
+
+struct ks8842_rx_dma_ctl {
+ struct dma_chan *chan;
+ struct dma_async_tx_descriptor *adesc;
+ struct sk_buff *skb;
+ struct scatterlist sg;
+ struct tasklet_struct tasklet;
+ int channel;
+};
+
+#define KS8842_USE_DMA(adapter) (((adapter)->dma_tx.channel != -1) && \
+ ((adapter)->dma_rx.channel != -1))
+
+struct ks8842_adapter {
+ void __iomem *hw_addr;
+ int irq;
+ unsigned long conf_flags; /* copy of platform_device config */
+ struct tasklet_struct tasklet;
+ spinlock_t lock; /* spinlock to be interrupt safe */
+ struct work_struct timeout_work;
+ struct net_device *netdev;
+ struct device *dev;
+ struct ks8842_tx_dma_ctl dma_tx;
+ struct ks8842_rx_dma_ctl dma_rx;
+};
+
+static void ks8842_dma_rx_cb(void *data);
+static void ks8842_dma_tx_cb(void *data);
+
+static inline void ks8842_resume_dma(struct ks8842_adapter *adapter)
+{
+ iowrite32(1, adapter->hw_addr + REQ_TIMB_DMA_RESUME);
+}
+
+static inline void ks8842_select_bank(struct ks8842_adapter *adapter, u16 bank)
+{
+ iowrite16(bank, adapter->hw_addr + REG_SELECT_BANK);
+}
+
+static inline void ks8842_write8(struct ks8842_adapter *adapter, u16 bank,
+ u8 value, int offset)
+{
+ ks8842_select_bank(adapter, bank);
+ iowrite8(value, adapter->hw_addr + offset);
+}
+
+static inline void ks8842_write16(struct ks8842_adapter *adapter, u16 bank,
+ u16 value, int offset)
+{
+ ks8842_select_bank(adapter, bank);
+ iowrite16(value, adapter->hw_addr + offset);
+}
+
+static inline void ks8842_enable_bits(struct ks8842_adapter *adapter, u16 bank,
+ u16 bits, int offset)
+{
+ u16 reg;
+ ks8842_select_bank(adapter, bank);
+ reg = ioread16(adapter->hw_addr + offset);
+ reg |= bits;
+ iowrite16(reg, adapter->hw_addr + offset);
+}
+
+static inline void ks8842_clear_bits(struct ks8842_adapter *adapter, u16 bank,
+ u16 bits, int offset)
+{
+ u16 reg;
+ ks8842_select_bank(adapter, bank);
+ reg = ioread16(adapter->hw_addr + offset);
+ reg &= ~bits;
+ iowrite16(reg, adapter->hw_addr + offset);
+}
+
+static inline void ks8842_write32(struct ks8842_adapter *adapter, u16 bank,
+ u32 value, int offset)
+{
+ ks8842_select_bank(adapter, bank);
+ iowrite32(value, adapter->hw_addr + offset);
+}
+
+static inline u8 ks8842_read8(struct ks8842_adapter *adapter, u16 bank,
+ int offset)
+{
+ ks8842_select_bank(adapter, bank);
+ return ioread8(adapter->hw_addr + offset);
+}
+
+static inline u16 ks8842_read16(struct ks8842_adapter *adapter, u16 bank,
+ int offset)
+{
+ ks8842_select_bank(adapter, bank);
+ return ioread16(adapter->hw_addr + offset);
+}
+
+static inline u32 ks8842_read32(struct ks8842_adapter *adapter, u16 bank,
+ int offset)
+{
+ ks8842_select_bank(adapter, bank);
+ return ioread32(adapter->hw_addr + offset);
+}
+
+static void ks8842_reset(struct ks8842_adapter *adapter)
+{
+ if (adapter->conf_flags & MICREL_KS884X) {
+ ks8842_write16(adapter, 3, 1, REG_GRR);
+ msleep(10);
+ iowrite16(0, adapter->hw_addr + REG_GRR);
+ } else {
+ /* The KS8842 goes haywire when doing softare reset
+ * a work around in the timberdale IP is implemented to
+ * do a hardware reset instead
+ ks8842_write16(adapter, 3, 1, REG_GRR);
+ msleep(10);
+ iowrite16(0, adapter->hw_addr + REG_GRR);
+ */
+ iowrite32(0x1, adapter->hw_addr + REG_TIMB_RST);
+ msleep(20);
+ }
+}
+
+static void ks8842_update_link_status(struct net_device *netdev,
+ struct ks8842_adapter *adapter)
+{
+ /* check the status of the link */
+ if (ks8842_read16(adapter, 45, REG_P1MBSR) & 0x4) {
+ netif_carrier_on(netdev);
+ netif_wake_queue(netdev);
+ } else {
+ netif_stop_queue(netdev);
+ netif_carrier_off(netdev);
+ }
+}
+
+static void ks8842_enable_tx(struct ks8842_adapter *adapter)
+{
+ ks8842_enable_bits(adapter, 16, 0x01, REG_TXCR);
+}
+
+static void ks8842_disable_tx(struct ks8842_adapter *adapter)
+{
+ ks8842_clear_bits(adapter, 16, 0x01, REG_TXCR);
+}
+
+static void ks8842_enable_rx(struct ks8842_adapter *adapter)
+{
+ ks8842_enable_bits(adapter, 16, 0x01, REG_RXCR);
+}
+
+static void ks8842_disable_rx(struct ks8842_adapter *adapter)
+{
+ ks8842_clear_bits(adapter, 16, 0x01, REG_RXCR);
+}
+
+static void ks8842_reset_hw(struct ks8842_adapter *adapter)
+{
+ /* reset the HW */
+ ks8842_reset(adapter);
+
+ /* Enable QMU Transmit flow control / transmit padding / Transmit CRC */
+ ks8842_write16(adapter, 16, 0x000E, REG_TXCR);
+
+ /* enable the receiver, uni + multi + broadcast + flow ctrl
+ + crc strip */
+ ks8842_write16(adapter, 16, 0x8 | 0x20 | 0x40 | 0x80 | 0x400,
+ REG_RXCR);
+
+ /* TX frame pointer autoincrement */
+ ks8842_write16(adapter, 17, 0x4000, REG_TXFDPR);
+
+ /* RX frame pointer autoincrement */
+ ks8842_write16(adapter, 17, 0x4000, REG_RXFDPR);
+
+ /* RX 2 kb high watermark */
+ ks8842_write16(adapter, 0, 0x1000, REG_QRFCR);
+
+ /* aggressive back off in half duplex */
+ ks8842_enable_bits(adapter, 32, 1 << 8, REG_SGCR1);
+
+ /* enable no excessive collison drop */
+ ks8842_enable_bits(adapter, 32, 1 << 3, REG_SGCR2);
+
+ /* Enable port 1 force flow control / back pressure / transmit / recv */
+ ks8842_write16(adapter, 48, 0x1E07, REG_P1CR2);
+
+ /* restart port auto-negotiation */
+ ks8842_enable_bits(adapter, 49, 1 << 13, REG_P1CR4);
+
+ /* Enable the transmitter */
+ ks8842_enable_tx(adapter);
+
+ /* Enable the receiver */
+ ks8842_enable_rx(adapter);
+
+ /* clear all interrupts */
+ ks8842_write16(adapter, 18, 0xffff, REG_ISR);
+
+ /* enable interrupts */
+ if (KS8842_USE_DMA(adapter)) {
+ /* When running in DMA Mode the RX interrupt is not enabled in
+ timberdale because RX data is received by DMA callbacks
+ it must still be enabled in the KS8842 because it indicates
+ to timberdale when there is RX data for it's DMA FIFOs */
+ iowrite16(ENABLED_IRQS_DMA_IP, adapter->hw_addr + REG_TIMB_IER);
+ ks8842_write16(adapter, 18, ENABLED_IRQS_DMA, REG_IER);
+ } else {
+ if (!(adapter->conf_flags & MICREL_KS884X))
+ iowrite16(ENABLED_IRQS,
+ adapter->hw_addr + REG_TIMB_IER);
+ ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER);
+ }
+ /* enable the switch */
+ ks8842_write16(adapter, 32, 0x1, REG_SW_ID_AND_ENABLE);
+}
+
+static void ks8842_read_mac_addr(struct ks8842_adapter *adapter, u8 *dest)
+{
+ int i;
+ u16 mac;
+
+ for (i = 0; i < ETH_ALEN; i++)
+ dest[ETH_ALEN - i - 1] = ks8842_read8(adapter, 2, REG_MARL + i);
+
+ if (adapter->conf_flags & MICREL_KS884X) {
+ /*
+ the sequence of saving mac addr between MAC and Switch is
+ different.
+ */
+
+ mac = ks8842_read16(adapter, 2, REG_MARL);
+ ks8842_write16(adapter, 39, mac, REG_MACAR3);
+ mac = ks8842_read16(adapter, 2, REG_MARM);
+ ks8842_write16(adapter, 39, mac, REG_MACAR2);
+ mac = ks8842_read16(adapter, 2, REG_MARH);
+ ks8842_write16(adapter, 39, mac, REG_MACAR1);
+ } else {
+
+ /* make sure the switch port uses the same MAC as the QMU */
+ mac = ks8842_read16(adapter, 2, REG_MARL);
+ ks8842_write16(adapter, 39, mac, REG_MACAR1);
+ mac = ks8842_read16(adapter, 2, REG_MARM);
+ ks8842_write16(adapter, 39, mac, REG_MACAR2);
+ mac = ks8842_read16(adapter, 2, REG_MARH);
+ ks8842_write16(adapter, 39, mac, REG_MACAR3);
+ }
+}
+
+static void ks8842_write_mac_addr(struct ks8842_adapter *adapter, u8 *mac)
+{
+ unsigned long flags;
+ unsigned i;
+
+ spin_lock_irqsave(&adapter->lock, flags);
+ for (i = 0; i < ETH_ALEN; i++) {
+ ks8842_write8(adapter, 2, mac[ETH_ALEN - i - 1], REG_MARL + i);
+ if (!(adapter->conf_flags & MICREL_KS884X))
+ ks8842_write8(adapter, 39, mac[ETH_ALEN - i - 1],
+ REG_MACAR1 + i);
+ }
+
+ if (adapter->conf_flags & MICREL_KS884X) {
+ /*
+ the sequence of saving mac addr between MAC and Switch is
+ different.
+ */
+
+ u16 mac;
+
+ mac = ks8842_read16(adapter, 2, REG_MARL);
+ ks8842_write16(adapter, 39, mac, REG_MACAR3);
+ mac = ks8842_read16(adapter, 2, REG_MARM);
+ ks8842_write16(adapter, 39, mac, REG_MACAR2);
+ mac = ks8842_read16(adapter, 2, REG_MARH);
+ ks8842_write16(adapter, 39, mac, REG_MACAR1);
+ }
+ spin_unlock_irqrestore(&adapter->lock, flags);
+}
+
+static inline u16 ks8842_tx_fifo_space(struct ks8842_adapter *adapter)
+{
+ return ks8842_read16(adapter, 16, REG_TXMIR) & 0x1fff;
+}
+
+static int ks8842_tx_frame_dma(struct sk_buff *skb, struct net_device *netdev)
+{
+ struct ks8842_adapter *adapter = netdev_priv(netdev);
+ struct ks8842_tx_dma_ctl *ctl = &adapter->dma_tx;
+ u8 *buf = ctl->buf;
+
+ if (ctl->adesc) {
+ netdev_dbg(netdev, "%s: TX ongoing\n", __func__);
+ /* transfer ongoing */
+ return NETDEV_TX_BUSY;
+ }
+
+ sg_dma_len(&ctl->sg) = skb->len + sizeof(u32);
+
+ /* copy data to the TX buffer */
+ /* the control word, enable IRQ, port 1 and the length */
+ *buf++ = 0x00;
+ *buf++ = 0x01; /* Port 1 */
+ *buf++ = skb->len & 0xff;
+ *buf++ = (skb->len >> 8) & 0xff;
+ skb_copy_from_linear_data(skb, buf, skb->len);
+
+ dma_sync_single_range_for_device(adapter->dev,
+ sg_dma_address(&ctl->sg), 0, sg_dma_len(&ctl->sg),
+ DMA_TO_DEVICE);
+
+ /* make sure the length is a multiple of 4 */
+ if (sg_dma_len(&ctl->sg) % 4)
+ sg_dma_len(&ctl->sg) += 4 - sg_dma_len(&ctl->sg) % 4;
+
+ ctl->adesc = dmaengine_prep_slave_sg(ctl->chan,
+ &ctl->sg, 1, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
+ if (!ctl->adesc)
+ return NETDEV_TX_BUSY;
+
+ ctl->adesc->callback_param = netdev;
+ ctl->adesc->callback = ks8842_dma_tx_cb;
+ ctl->adesc->tx_submit(ctl->adesc);
+
+ netdev->stats.tx_bytes += skb->len;
+
+ dev_kfree_skb(skb);
+
+ return NETDEV_TX_OK;
+}
+
+static int ks8842_tx_frame(struct sk_buff *skb, struct net_device *netdev)
+{
+ struct ks8842_adapter *adapter = netdev_priv(netdev);
+ int len = skb->len;
+
+ netdev_dbg(netdev, "%s: len %u head %p data %p tail %p end %p\n",
+ __func__, skb->len, skb->head, skb->data,
+ skb_tail_pointer(skb), skb_end_pointer(skb));
+
+ /* check FIFO buffer space, we need space for CRC and command bits */
+ if (ks8842_tx_fifo_space(adapter) < len + 8)
+ return NETDEV_TX_BUSY;
+
+ if (adapter->conf_flags & KS884X_16BIT) {
+ u16 *ptr16 = (u16 *)skb->data;
+ ks8842_write16(adapter, 17, 0x8000 | 0x100, REG_QMU_DATA_LO);
+ ks8842_write16(adapter, 17, (u16)len, REG_QMU_DATA_HI);
+ netdev->stats.tx_bytes += len;
+
+ /* copy buffer */
+ while (len > 0) {
+ iowrite16(*ptr16++, adapter->hw_addr + REG_QMU_DATA_LO);
+ iowrite16(*ptr16++, adapter->hw_addr + REG_QMU_DATA_HI);
+ len -= sizeof(u32);
+ }
+ } else {
+
+ u32 *ptr = (u32 *)skb->data;
+ u32 ctrl;
+ /* the control word, enable IRQ, port 1 and the length */
+ ctrl = 0x8000 | 0x100 | (len << 16);
+ ks8842_write32(adapter, 17, ctrl, REG_QMU_DATA_LO);
+
+ netdev->stats.tx_bytes += len;
+
+ /* copy buffer */
+ while (len > 0) {
+ iowrite32(*ptr, adapter->hw_addr + REG_QMU_DATA_LO);
+ len -= sizeof(u32);
+ ptr++;
+ }
+ }
+
+ /* enqueue packet */
+ ks8842_write16(adapter, 17, 1, REG_TXQCR);
+
+ dev_kfree_skb(skb);
+
+ return NETDEV_TX_OK;
+}
+
+static void ks8842_update_rx_err_counters(struct net_device *netdev, u32 status)
+{
+ netdev_dbg(netdev, "RX error, status: %x\n", status);
+
+ netdev->stats.rx_errors++;
+ if (status & RXSR_TOO_LONG)
+ netdev->stats.rx_length_errors++;
+ if (status & RXSR_CRC_ERROR)
+ netdev->stats.rx_crc_errors++;
+ if (status & RXSR_RUNT)
+ netdev->stats.rx_frame_errors++;
+}
+
+static void ks8842_update_rx_counters(struct net_device *netdev, u32 status,
+ int len)
+{
+ netdev_dbg(netdev, "RX packet, len: %d\n", len);
+
+ netdev->stats.rx_packets++;
+ netdev->stats.rx_bytes += len;
+ if (status & RXSR_MULTICAST)
+ netdev->stats.multicast++;
+}
+
+static int __ks8842_start_new_rx_dma(struct net_device *netdev)
+{
+ struct ks8842_adapter *adapter = netdev_priv(netdev);
+ struct ks8842_rx_dma_ctl *ctl = &adapter->dma_rx;
+ struct scatterlist *sg = &ctl->sg;
+ int err;
+
+ ctl->skb = netdev_alloc_skb(netdev, DMA_BUFFER_SIZE);
+ if (ctl->skb) {
+ sg_init_table(sg, 1);
+ sg_dma_address(sg) = dma_map_single(adapter->dev,
+ ctl->skb->data, DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
+ err = dma_mapping_error(adapter->dev, sg_dma_address(sg));
+ if (unlikely(err)) {
+ sg_dma_address(sg) = 0;
+ goto out;
+ }
+
+ sg_dma_len(sg) = DMA_BUFFER_SIZE;
+
+ ctl->adesc = dmaengine_prep_slave_sg(ctl->chan,
+ sg, 1, DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT);
+
+ if (!ctl->adesc)
+ goto out;
+
+ ctl->adesc->callback_param = netdev;
+ ctl->adesc->callback = ks8842_dma_rx_cb;
+ ctl->adesc->tx_submit(ctl->adesc);
+ } else {
+ err = -ENOMEM;
+ sg_dma_address(sg) = 0;
+ goto out;
+ }
+
+ return err;
+out:
+ if (sg_dma_address(sg))
+ dma_unmap_single(adapter->dev, sg_dma_address(sg),
+ DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
+ sg_dma_address(sg) = 0;
+ if (ctl->skb)
+ dev_kfree_skb(ctl->skb);
+
+ ctl->skb = NULL;
+
+ printk(KERN_ERR DRV_NAME": Failed to start RX DMA: %d\n", err);
+ return err;
+}
+
+static void ks8842_rx_frame_dma_tasklet(unsigned long arg)
+{
+ struct net_device *netdev = (struct net_device *)arg;
+ struct ks8842_adapter *adapter = netdev_priv(netdev);
+ struct ks8842_rx_dma_ctl *ctl = &adapter->dma_rx;
+ struct sk_buff *skb = ctl->skb;
+ dma_addr_t addr = sg_dma_address(&ctl->sg);
+ u32 status;
+
+ ctl->adesc = NULL;
+
+ /* kick next transfer going */
+ __ks8842_start_new_rx_dma(netdev);
+
+ /* now handle the data we got */
+ dma_unmap_single(adapter->dev, addr, DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
+
+ status = *((u32 *)skb->data);
+
+ netdev_dbg(netdev, "%s - rx_data: status: %x\n",
+ __func__, status & 0xffff);
+
+ /* check the status */
+ if ((status & RXSR_VALID) && !(status & RXSR_ERROR)) {
+ int len = (status >> 16) & 0x7ff;
+
+ ks8842_update_rx_counters(netdev, status, len);
+
+ /* reserve 4 bytes which is the status word */
+ skb_reserve(skb, 4);
+ skb_put(skb, len);
+
+ skb->protocol = eth_type_trans(skb, netdev);
+ netif_rx(skb);
+ } else {
+ ks8842_update_rx_err_counters(netdev, status);
+ dev_kfree_skb(skb);
+ }
+}
+
+static void ks8842_rx_frame(struct net_device *netdev,
+ struct ks8842_adapter *adapter)
+{
+ u32 status;
+ int len;
+
+ if (adapter->conf_flags & KS884X_16BIT) {
+ status = ks8842_read16(adapter, 17, REG_QMU_DATA_LO);
+ len = ks8842_read16(adapter, 17, REG_QMU_DATA_HI);
+ netdev_dbg(netdev, "%s - rx_data: status: %x\n",
+ __func__, status);
+ } else {
+ status = ks8842_read32(adapter, 17, REG_QMU_DATA_LO);
+ len = (status >> 16) & 0x7ff;
+ status &= 0xffff;
+ netdev_dbg(netdev, "%s - rx_data: status: %x\n",
+ __func__, status);
+ }
+
+ /* check the status */
+ if ((status & RXSR_VALID) && !(status & RXSR_ERROR)) {
+ struct sk_buff *skb = netdev_alloc_skb_ip_align(netdev, len + 3);
+
+ if (skb) {
+
+ ks8842_update_rx_counters(netdev, status, len);
+
+ if (adapter->conf_flags & KS884X_16BIT) {
+ u16 *data16 = (u16 *)skb_put(skb, len);
+ ks8842_select_bank(adapter, 17);
+ while (len > 0) {
+ *data16++ = ioread16(adapter->hw_addr +
+ REG_QMU_DATA_LO);
+ *data16++ = ioread16(adapter->hw_addr +
+ REG_QMU_DATA_HI);
+ len -= sizeof(u32);
+ }
+ } else {
+ u32 *data = (u32 *)skb_put(skb, len);
+
+ ks8842_select_bank(adapter, 17);
+ while (len > 0) {
+ *data++ = ioread32(adapter->hw_addr +
+ REG_QMU_DATA_LO);
+ len -= sizeof(u32);
+ }
+ }
+ skb->protocol = eth_type_trans(skb, netdev);
+ netif_rx(skb);
+ } else
+ netdev->stats.rx_dropped++;
+ } else
+ ks8842_update_rx_err_counters(netdev, status);
+
+ /* set high watermark to 3K */
+ ks8842_clear_bits(adapter, 0, 1 << 12, REG_QRFCR);
+
+ /* release the frame */
+ ks8842_write16(adapter, 17, 0x01, REG_RXQCR);
+
+ /* set high watermark to 2K */
+ ks8842_enable_bits(adapter, 0, 1 << 12, REG_QRFCR);
+}
+
+static void ks8842_handle_rx(struct net_device *netdev,
+ struct ks8842_adapter *adapter)
+{
+ u16 rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
+ netdev_dbg(netdev, "%s Entry - rx_data: %d\n", __func__, rx_data);
+ while (rx_data) {
+ ks8842_rx_frame(netdev, adapter);
+ rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
+ }
+}
+
+static void ks8842_handle_tx(struct net_device *netdev,
+ struct ks8842_adapter *adapter)
+{
+ u16 sr = ks8842_read16(adapter, 16, REG_TXSR);
+ netdev_dbg(netdev, "%s - entry, sr: %x\n", __func__, sr);
+ netdev->stats.tx_packets++;
+ if (netif_queue_stopped(netdev))
+ netif_wake_queue(netdev);
+}
+
+static void ks8842_handle_rx_overrun(struct net_device *netdev,
+ struct ks8842_adapter *adapter)
+{
+ netdev_dbg(netdev, "%s: entry\n", __func__);
+ netdev->stats.rx_errors++;
+ netdev->stats.rx_fifo_errors++;
+}
+
+static void ks8842_tasklet(unsigned long arg)
+{
+ struct net_device *netdev = (struct net_device *)arg;
+ struct ks8842_adapter *adapter = netdev_priv(netdev);
+ u16 isr;
+ unsigned long flags;
+ u16 entry_bank;
+
+ /* read current bank to be able to set it back */
+ spin_lock_irqsave(&adapter->lock, flags);
+ entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
+ spin_unlock_irqrestore(&adapter->lock, flags);
+
+ isr = ks8842_read16(adapter, 18, REG_ISR);
+ netdev_dbg(netdev, "%s - ISR: 0x%x\n", __func__, isr);
+
+ /* when running in DMA mode, do not ack RX interrupts, it is handled
+ internally by timberdale, otherwise it's DMA FIFO:s would stop
+ */
+ if (KS8842_USE_DMA(adapter))
+ isr &= ~IRQ_RX;
+
+ /* Ack */
+ ks8842_write16(adapter, 18, isr, REG_ISR);
+
+ if (!(adapter->conf_flags & MICREL_KS884X))
+ /* Ack in the timberdale IP as well */
+ iowrite32(0x1, adapter->hw_addr + REG_TIMB_IAR);
+
+ if (!netif_running(netdev))
+ return;
+
+ if (isr & IRQ_LINK_CHANGE)
+ ks8842_update_link_status(netdev, adapter);
+
+ /* should not get IRQ_RX when running DMA mode */
+ if (isr & (IRQ_RX | IRQ_RX_ERROR) && !KS8842_USE_DMA(adapter))
+ ks8842_handle_rx(netdev, adapter);
+
+ /* should only happen when in PIO mode */
+ if (isr & IRQ_TX)
+ ks8842_handle_tx(netdev, adapter);
+
+ if (isr & IRQ_RX_OVERRUN)
+ ks8842_handle_rx_overrun(netdev, adapter);
+
+ if (isr & IRQ_TX_STOPPED) {
+ ks8842_disable_tx(adapter);
+ ks8842_enable_tx(adapter);
+ }
+
+ if (isr & IRQ_RX_STOPPED) {
+ ks8842_disable_rx(adapter);
+ ks8842_enable_rx(adapter);
+ }
+
+ /* re-enable interrupts, put back the bank selection register */
+ spin_lock_irqsave(&adapter->lock, flags);
+ if (KS8842_USE_DMA(adapter))
+ ks8842_write16(adapter, 18, ENABLED_IRQS_DMA, REG_IER);
+ else
+ ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER);
+ iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);
+
+ /* Make sure timberdale continues DMA operations, they are stopped while
+ we are handling the ks8842 because we might change bank */
+ if (KS8842_USE_DMA(adapter))
+ ks8842_resume_dma(adapter);
+
+ spin_unlock_irqrestore(&adapter->lock, flags);
+}
+
+static irqreturn_t ks8842_irq(int irq, void *devid)
+{
+ struct net_device *netdev = devid;
+ struct ks8842_adapter *adapter = netdev_priv(netdev);
+ u16 isr;
+ u16 entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
+ irqreturn_t ret = IRQ_NONE;
+
+ isr = ks8842_read16(adapter, 18, REG_ISR);
+ netdev_dbg(netdev, "%s - ISR: 0x%x\n", __func__, isr);
+
+ if (isr) {
+ if (KS8842_USE_DMA(adapter))
+ /* disable all but RX IRQ, since the FPGA relies on it*/
+ ks8842_write16(adapter, 18, IRQ_RX, REG_IER);
+ else
+ /* disable IRQ */
+ ks8842_write16(adapter, 18, 0x00, REG_IER);
+
+ /* schedule tasklet */
+ tasklet_schedule(&adapter->tasklet);
+
+ ret = IRQ_HANDLED;
+ }
+
+ iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);
+
+ /* After an interrupt, tell timberdale to continue DMA operations.
+ DMA is disabled while we are handling the ks8842 because we might
+ change bank */
+ ks8842_resume_dma(adapter);
+
+ return ret;
+}
+
+static void ks8842_dma_rx_cb(void *data)
+{
+ struct net_device *netdev = data;
+ struct ks8842_adapter *adapter = netdev_priv(netdev);
+
+ netdev_dbg(netdev, "RX DMA finished\n");
+ /* schedule tasklet */
+ if (adapter->dma_rx.adesc)
+ tasklet_schedule(&adapter->dma_rx.tasklet);
+}
+
+static void ks8842_dma_tx_cb(void *data)
+{
+ struct net_device *netdev = data;
+ struct ks8842_adapter *adapter = netdev_priv(netdev);
+ struct ks8842_tx_dma_ctl *ctl = &adapter->dma_tx;
+
+ netdev_dbg(netdev, "TX DMA finished\n");
+
+ if (!ctl->adesc)
+ return;
+
+ netdev->stats.tx_packets++;
+ ctl->adesc = NULL;
+
+ if (netif_queue_stopped(netdev))
+ netif_wake_queue(netdev);
+}
+
+static void ks8842_stop_dma(struct ks8842_adapter *adapter)
+{
+ struct ks8842_tx_dma_ctl *tx_ctl = &adapter->dma_tx;
+ struct ks8842_rx_dma_ctl *rx_ctl = &adapter->dma_rx;
+
+ tx_ctl->adesc = NULL;
+ if (tx_ctl->chan)
+ dmaengine_terminate_all(tx_ctl->chan);
+
+ rx_ctl->adesc = NULL;
+ if (rx_ctl->chan)
+ dmaengine_terminate_all(rx_ctl->chan);
+
+ if (sg_dma_address(&rx_ctl->sg))
+ dma_unmap_single(adapter->dev, sg_dma_address(&rx_ctl->sg),
+ DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
+ sg_dma_address(&rx_ctl->sg) = 0;
+
+ dev_kfree_skb(rx_ctl->skb);
+ rx_ctl->skb = NULL;
+}
+
+static void ks8842_dealloc_dma_bufs(struct ks8842_adapter *adapter)
+{
+ struct ks8842_tx_dma_ctl *tx_ctl = &adapter->dma_tx;
+ struct ks8842_rx_dma_ctl *rx_ctl = &adapter->dma_rx;
+
+ ks8842_stop_dma(adapter);
+
+ if (tx_ctl->chan)
+ dma_release_channel(tx_ctl->chan);
+ tx_ctl->chan = NULL;
+
+ if (rx_ctl->chan)
+ dma_release_channel(rx_ctl->chan);
+ rx_ctl->chan = NULL;
+
+ tasklet_kill(&rx_ctl->tasklet);
+
+ if (sg_dma_address(&tx_ctl->sg))
+ dma_unmap_single(adapter->dev, sg_dma_address(&tx_ctl->sg),
+ DMA_BUFFER_SIZE, DMA_TO_DEVICE);
+ sg_dma_address(&tx_ctl->sg) = 0;
+
+ kfree(tx_ctl->buf);
+ tx_ctl->buf = NULL;
+}
+
+static bool ks8842_dma_filter_fn(struct dma_chan *chan, void *filter_param)
+{
+ return chan->chan_id == (long)filter_param;
+}
+
+static int ks8842_alloc_dma_bufs(struct net_device *netdev)
+{
+ struct ks8842_adapter *adapter = netdev_priv(netdev);
+ struct ks8842_tx_dma_ctl *tx_ctl = &adapter->dma_tx;
+ struct ks8842_rx_dma_ctl *rx_ctl = &adapter->dma_rx;
+ int err;
+
+ dma_cap_mask_t mask;
+
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_SLAVE, mask);
+ dma_cap_set(DMA_PRIVATE, mask);
+
+ sg_init_table(&tx_ctl->sg, 1);
+
+ tx_ctl->chan = dma_request_channel(mask, ks8842_dma_filter_fn,
+ (void *)(long)tx_ctl->channel);
+ if (!tx_ctl->chan) {
+ err = -ENODEV;
+ goto err;
+ }
+
+ /* allocate DMA buffer */
+ tx_ctl->buf = kmalloc(DMA_BUFFER_SIZE, GFP_KERNEL);
+ if (!tx_ctl->buf) {
+ err = -ENOMEM;
+ goto err;
+ }
+
+ sg_dma_address(&tx_ctl->sg) = dma_map_single(adapter->dev,
+ tx_ctl->buf, DMA_BUFFER_SIZE, DMA_TO_DEVICE);
+ err = dma_mapping_error(adapter->dev,
+ sg_dma_address(&tx_ctl->sg));
+ if (err) {
+ sg_dma_address(&tx_ctl->sg) = 0;
+ goto err;
+ }
+
+ rx_ctl->chan = dma_request_channel(mask, ks8842_dma_filter_fn,
+ (void *)(long)rx_ctl->channel);
+ if (!rx_ctl->chan) {
+ err = -ENODEV;
+ goto err;
+ }
+
+ tasklet_init(&rx_ctl->tasklet, ks8842_rx_frame_dma_tasklet,
+ (unsigned long)netdev);
+
+ return 0;
+err:
+ ks8842_dealloc_dma_bufs(adapter);
+ return err;
+}
+
+/* Netdevice operations */
+
+static int ks8842_open(struct net_device *netdev)
+{
+ struct ks8842_adapter *adapter = netdev_priv(netdev);
+ int err;
+
+ netdev_dbg(netdev, "%s - entry\n", __func__);
+
+ if (KS8842_USE_DMA(adapter)) {
+ err = ks8842_alloc_dma_bufs(netdev);
+
+ if (!err) {
+ /* start RX dma */
+ err = __ks8842_start_new_rx_dma(netdev);
+ if (err)
+ ks8842_dealloc_dma_bufs(adapter);
+ }
+
+ if (err) {
+ printk(KERN_WARNING DRV_NAME
+ ": Failed to initiate DMA, running PIO\n");
+ ks8842_dealloc_dma_bufs(adapter);
+ adapter->dma_rx.channel = -1;
+ adapter->dma_tx.channel = -1;
+ }
+ }
+
+ /* reset the HW */
+ ks8842_reset_hw(adapter);
+
+ ks8842_write_mac_addr(adapter, netdev->dev_addr);
+
+ ks8842_update_link_status(netdev, adapter);
+
+ err = request_irq(adapter->irq, ks8842_irq, IRQF_SHARED, DRV_NAME,
+ netdev);
+ if (err) {
+ pr_err("Failed to request IRQ: %d: %d\n", adapter->irq, err);
+ return err;
+ }
+
+ return 0;
+}
+
+static int ks8842_close(struct net_device *netdev)
+{
+ struct ks8842_adapter *adapter = netdev_priv(netdev);
+
+ netdev_dbg(netdev, "%s - entry\n", __func__);
+
+ cancel_work_sync(&adapter->timeout_work);
+
+ if (KS8842_USE_DMA(adapter))
+ ks8842_dealloc_dma_bufs(adapter);
+
+ /* free the irq */
+ free_irq(adapter->irq, netdev);
+
+ /* disable the switch */
+ ks8842_write16(adapter, 32, 0x0, REG_SW_ID_AND_ENABLE);
+
+ return 0;
+}
+
+static netdev_tx_t ks8842_xmit_frame(struct sk_buff *skb,
+ struct net_device *netdev)
+{
+ int ret;
+ struct ks8842_adapter *adapter = netdev_priv(netdev);
+
+ netdev_dbg(netdev, "%s: entry\n", __func__);
+
+ if (KS8842_USE_DMA(adapter)) {
+ unsigned long flags;
+ ret = ks8842_tx_frame_dma(skb, netdev);
+ /* for now only allow one transfer at the time */
+ spin_lock_irqsave(&adapter->lock, flags);
+ if (adapter->dma_tx.adesc)
+ netif_stop_queue(netdev);
+ spin_unlock_irqrestore(&adapter->lock, flags);
+ return ret;
+ }
+
+ ret = ks8842_tx_frame(skb, netdev);
+
+ if (ks8842_tx_fifo_space(adapter) < netdev->mtu + 8)
+ netif_stop_queue(netdev);
+
+ return ret;
+}
+
+static int ks8842_set_mac(struct net_device *netdev, void *p)
+{
+ struct ks8842_adapter *adapter = netdev_priv(netdev);
+ struct sockaddr *addr = p;
+ char *mac = (u8 *)addr->sa_data;
+
+ netdev_dbg(netdev, "%s: entry\n", __func__);
+
+ if (!is_valid_ether_addr(addr->sa_data))
+ return -EADDRNOTAVAIL;
+
+ memcpy(netdev->dev_addr, mac, netdev->addr_len);
+
+ ks8842_write_mac_addr(adapter, mac);
+ return 0;
+}
+
+static void ks8842_tx_timeout_work(struct work_struct *work)
+{
+ struct ks8842_adapter *adapter =
+ container_of(work, struct ks8842_adapter, timeout_work);
+ struct net_device *netdev = adapter->netdev;
+ unsigned long flags;
+
+ netdev_dbg(netdev, "%s: entry\n", __func__);
+
+ spin_lock_irqsave(&adapter->lock, flags);
+
+ if (KS8842_USE_DMA(adapter))
+ ks8842_stop_dma(adapter);
+
+ /* disable interrupts */
+ ks8842_write16(adapter, 18, 0, REG_IER);
+ ks8842_write16(adapter, 18, 0xFFFF, REG_ISR);
+
+ netif_stop_queue(netdev);
+
+ spin_unlock_irqrestore(&adapter->lock, flags);
+
+ ks8842_reset_hw(adapter);
+
+ ks8842_write_mac_addr(adapter, netdev->dev_addr);
+
+ ks8842_update_link_status(netdev, adapter);
+
+ if (KS8842_USE_DMA(adapter))
+ __ks8842_start_new_rx_dma(netdev);
+}
+
+static void ks8842_tx_timeout(struct net_device *netdev)
+{
+ struct ks8842_adapter *adapter = netdev_priv(netdev);
+
+ netdev_dbg(netdev, "%s: entry\n", __func__);
+
+ schedule_work(&adapter->timeout_work);
+}
+
+static const struct net_device_ops ks8842_netdev_ops = {
+ .ndo_open = ks8842_open,
+ .ndo_stop = ks8842_close,
+ .ndo_start_xmit = ks8842_xmit_frame,
+ .ndo_set_mac_address = ks8842_set_mac,
+ .ndo_tx_timeout = ks8842_tx_timeout,
+ .ndo_validate_addr = eth_validate_addr
+};
+
+static const struct ethtool_ops ks8842_ethtool_ops = {
+ .get_link = ethtool_op_get_link,
+};
+
+static int ks8842_probe(struct platform_device *pdev)
+{
+ int err = -ENOMEM;
+ struct resource *iomem;
+ struct net_device *netdev;
+ struct ks8842_adapter *adapter;
+ struct ks8842_platform_data *pdata = dev_get_platdata(&pdev->dev);
+ u16 id;
+ unsigned i;
+
+ iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!request_mem_region(iomem->start, resource_size(iomem), DRV_NAME))
+ goto err_mem_region;
+
+ netdev = alloc_etherdev(sizeof(struct ks8842_adapter));
+ if (!netdev)
+ goto err_alloc_etherdev;
+
+ SET_NETDEV_DEV(netdev, &pdev->dev);
+
+ adapter = netdev_priv(netdev);
+ adapter->netdev = netdev;
+ INIT_WORK(&adapter->timeout_work, ks8842_tx_timeout_work);
+ adapter->hw_addr = ioremap(iomem->start, resource_size(iomem));
+ adapter->conf_flags = iomem->flags;
+
+ if (!adapter->hw_addr)
+ goto err_ioremap;
+
+ adapter->irq = platform_get_irq(pdev, 0);
+ if (adapter->irq < 0) {
+ err = adapter->irq;
+ goto err_get_irq;
+ }
+
+ adapter->dev = (pdev->dev.parent) ? pdev->dev.parent : &pdev->dev;
+
+ /* DMA is only supported when accessed via timberdale */
+ if (!(adapter->conf_flags & MICREL_KS884X) && pdata &&
+ (pdata->tx_dma_channel != -1) &&
+ (pdata->rx_dma_channel != -1)) {
+ adapter->dma_rx.channel = pdata->rx_dma_channel;
+ adapter->dma_tx.channel = pdata->tx_dma_channel;
+ } else {
+ adapter->dma_rx.channel = -1;
+ adapter->dma_tx.channel = -1;
+ }
+
+ tasklet_init(&adapter->tasklet, ks8842_tasklet, (unsigned long)netdev);
+ spin_lock_init(&adapter->lock);
+
+ netdev->netdev_ops = &ks8842_netdev_ops;
+ netdev->ethtool_ops = &ks8842_ethtool_ops;
+
+ /* Check if a mac address was given */
+ i = netdev->addr_len;
+ if (pdata) {
+ for (i = 0; i < netdev->addr_len; i++)
+ if (pdata->macaddr[i] != 0)
+ break;
+
+ if (i < netdev->addr_len)
+ /* an address was passed, use it */
+ memcpy(netdev->dev_addr, pdata->macaddr,
+ netdev->addr_len);
+ }
+
+ if (i == netdev->addr_len) {
+ ks8842_read_mac_addr(adapter, netdev->dev_addr);
+
+ if (!is_valid_ether_addr(netdev->dev_addr))
+ eth_hw_addr_random(netdev);
+ }
+
+ id = ks8842_read16(adapter, 32, REG_SW_ID_AND_ENABLE);
+
+ strcpy(netdev->name, "eth%d");
+ err = register_netdev(netdev);
+ if (err)
+ goto err_register;
+
+ platform_set_drvdata(pdev, netdev);
+
+ pr_info("Found chip, family: 0x%x, id: 0x%x, rev: 0x%x\n",
+ (id >> 8) & 0xff, (id >> 4) & 0xf, (id >> 1) & 0x7);
+
+ return 0;
+
+err_register:
+err_get_irq:
+ iounmap(adapter->hw_addr);
+err_ioremap:
+ free_netdev(netdev);
+err_alloc_etherdev:
+ release_mem_region(iomem->start, resource_size(iomem));
+err_mem_region:
+ return err;
+}
+
+static int ks8842_remove(struct platform_device *pdev)
+{
+ struct net_device *netdev = platform_get_drvdata(pdev);
+ struct ks8842_adapter *adapter = netdev_priv(netdev);
+ struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+ unregister_netdev(netdev);
+ tasklet_kill(&adapter->tasklet);
+ iounmap(adapter->hw_addr);
+ free_netdev(netdev);
+ release_mem_region(iomem->start, resource_size(iomem));
+ return 0;
+}
+
+
+static struct platform_driver ks8842_platform_driver = {
+ .driver = {
+ .name = DRV_NAME,
+ },
+ .probe = ks8842_probe,
+ .remove = ks8842_remove,
+};
+
+module_platform_driver(ks8842_platform_driver);
+
+MODULE_DESCRIPTION("Timberdale KS8842 ethernet driver");
+MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:ks8842");
+
Code Review / kvmfornfv.git / blobdiff