| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * ks8842.c timberdale KS8842 ethernet driver |
| * Copyright (c) 2009 Intel Corporation |
| */ |
| |
| /* 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); |
| if (dma_mapping_error(adapter->dev, sg_dma_address(sg))) { |
| err = -ENOMEM; |
| 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) { |
| err = -ENOMEM; |
| 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 0; |
| 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; |
| 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 = 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 = 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); |
| if (dma_mapping_error(adapter->dev, sg_dma_address(&tx_ctl->sg))) { |
| err = -ENOMEM; |
| 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"); |
| |