diff options
Diffstat (limited to 'drivers/net/ethernet/micrel/ks8842.c')
| -rw-r--r-- | drivers/net/ethernet/micrel/ks8842.c | 1259 |
1 files changed, 1259 insertions, 0 deletions
diff --git a/drivers/net/ethernet/micrel/ks8842.c b/drivers/net/ethernet/micrel/ks8842.c new file mode 100644 index 000000000..b27713906 --- /dev/null +++ b/drivers/net/ethernet/micrel/ks8842.c @@ -0,0 +1,1259 @@ +// 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(struct tasklet_struct *t) +{ + struct ks8842_adapter *adapter = from_tasklet(adapter, t, dma_rx.tasklet); + struct net_device *netdev = adapter->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(struct tasklet_struct *t) +{ + struct ks8842_adapter *adapter = from_tasklet(adapter, t, tasklet); + struct net_device *netdev = adapter->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_setup(&rx_ctl->tasklet, ks8842_rx_frame_dma_tasklet); + + 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, unsigned int txqueue) +{ + 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 (!iomem) { + dev_err(&pdev->dev, "Invalid resource\n"); + return -EINVAL; + } + 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_setup(&adapter->tasklet, ks8842_tasklet); + 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"); + |