690 lines
18 KiB
C
690 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Ethernet driver for the WIZnet W5300 chip.
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*
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* Copyright (C) 2008-2009 WIZnet Co.,Ltd.
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* Copyright (C) 2011 Taehun Kim <kth3321 <at> gmail.com>
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* Copyright (C) 2012 Mike Sinkovsky <msink@permonline.ru>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/platform_device.h>
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#include <linux/platform_data/wiznet.h>
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#include <linux/ethtool.h>
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#include <linux/skbuff.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/io.h>
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#include <linux/ioport.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/gpio.h>
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#define DRV_NAME "w5300"
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#define DRV_VERSION "2012-04-04"
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MODULE_DESCRIPTION("WIZnet W5300 Ethernet driver v"DRV_VERSION);
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MODULE_AUTHOR("Mike Sinkovsky <msink@permonline.ru>");
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MODULE_ALIAS("platform:"DRV_NAME);
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MODULE_LICENSE("GPL");
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/*
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* Registers
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*/
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#define W5300_MR 0x0000 /* Mode Register */
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#define MR_DBW (1 << 15) /* Data bus width */
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#define MR_MPF (1 << 14) /* Mac layer pause frame */
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#define MR_WDF(n) (((n)&7)<<11) /* Write data fetch time */
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#define MR_RDH (1 << 10) /* Read data hold time */
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#define MR_FS (1 << 8) /* FIFO swap */
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#define MR_RST (1 << 7) /* S/W reset */
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#define MR_PB (1 << 4) /* Ping block */
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#define MR_DBS (1 << 2) /* Data bus swap */
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#define MR_IND (1 << 0) /* Indirect mode */
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#define W5300_IR 0x0002 /* Interrupt Register */
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#define W5300_IMR 0x0004 /* Interrupt Mask Register */
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#define IR_S0 0x0001 /* S0 interrupt */
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#define W5300_SHARL 0x0008 /* Source MAC address (0123) */
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#define W5300_SHARH 0x000c /* Source MAC address (45) */
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#define W5300_TMSRL 0x0020 /* Transmit Memory Size (0123) */
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#define W5300_TMSRH 0x0024 /* Transmit Memory Size (4567) */
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#define W5300_RMSRL 0x0028 /* Receive Memory Size (0123) */
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#define W5300_RMSRH 0x002c /* Receive Memory Size (4567) */
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#define W5300_MTYPE 0x0030 /* Memory Type */
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#define W5300_IDR 0x00fe /* Chip ID register */
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#define IDR_W5300 0x5300 /* =0x5300 for WIZnet W5300 */
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#define W5300_S0_MR 0x0200 /* S0 Mode Register */
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#define S0_MR_CLOSED 0x0000 /* Close mode */
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#define S0_MR_MACRAW 0x0004 /* MAC RAW mode (promiscuous) */
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#define S0_MR_MACRAW_MF 0x0044 /* MAC RAW mode (filtered) */
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#define W5300_S0_CR 0x0202 /* S0 Command Register */
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#define S0_CR_OPEN 0x0001 /* OPEN command */
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#define S0_CR_CLOSE 0x0010 /* CLOSE command */
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#define S0_CR_SEND 0x0020 /* SEND command */
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#define S0_CR_RECV 0x0040 /* RECV command */
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#define W5300_S0_IMR 0x0204 /* S0 Interrupt Mask Register */
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#define W5300_S0_IR 0x0206 /* S0 Interrupt Register */
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#define S0_IR_RECV 0x0004 /* Receive interrupt */
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#define S0_IR_SENDOK 0x0010 /* Send OK interrupt */
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#define W5300_S0_SSR 0x0208 /* S0 Socket Status Register */
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#define W5300_S0_TX_WRSR 0x0220 /* S0 TX Write Size Register */
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#define W5300_S0_TX_FSR 0x0224 /* S0 TX Free Size Register */
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#define W5300_S0_RX_RSR 0x0228 /* S0 Received data Size */
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#define W5300_S0_TX_FIFO 0x022e /* S0 Transmit FIFO */
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#define W5300_S0_RX_FIFO 0x0230 /* S0 Receive FIFO */
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#define W5300_REGS_LEN 0x0400
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/*
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* Device driver private data structure
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*/
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struct w5300_priv {
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void __iomem *base;
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spinlock_t reg_lock;
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bool indirect;
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u16 (*read) (struct w5300_priv *priv, u16 addr);
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void (*write)(struct w5300_priv *priv, u16 addr, u16 data);
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int irq;
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int link_irq;
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int link_gpio;
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struct napi_struct napi;
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struct net_device *ndev;
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bool promisc;
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u32 msg_enable;
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};
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/************************************************************************
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*
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* Lowlevel I/O functions
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*
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***********************************************************************/
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/*
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* In direct address mode host system can directly access W5300 registers
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* after mapping to Memory-Mapped I/O space.
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*
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* 0x400 bytes are required for memory space.
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*/
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static inline u16 w5300_read_direct(struct w5300_priv *priv, u16 addr)
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{
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return ioread16(priv->base + (addr << CONFIG_WIZNET_BUS_SHIFT));
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}
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static inline void w5300_write_direct(struct w5300_priv *priv,
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u16 addr, u16 data)
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{
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iowrite16(data, priv->base + (addr << CONFIG_WIZNET_BUS_SHIFT));
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}
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/*
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* In indirect address mode host system indirectly accesses registers by
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* using Indirect Mode Address Register (IDM_AR) and Indirect Mode Data
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* Register (IDM_DR), which are directly mapped to Memory-Mapped I/O space.
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* Mode Register (MR) is directly accessible.
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*
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* Only 0x06 bytes are required for memory space.
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*/
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#define W5300_IDM_AR 0x0002 /* Indirect Mode Address */
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#define W5300_IDM_DR 0x0004 /* Indirect Mode Data */
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static u16 w5300_read_indirect(struct w5300_priv *priv, u16 addr)
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{
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unsigned long flags;
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u16 data;
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spin_lock_irqsave(&priv->reg_lock, flags);
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w5300_write_direct(priv, W5300_IDM_AR, addr);
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data = w5300_read_direct(priv, W5300_IDM_DR);
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spin_unlock_irqrestore(&priv->reg_lock, flags);
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return data;
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}
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static void w5300_write_indirect(struct w5300_priv *priv, u16 addr, u16 data)
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{
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unsigned long flags;
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spin_lock_irqsave(&priv->reg_lock, flags);
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w5300_write_direct(priv, W5300_IDM_AR, addr);
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w5300_write_direct(priv, W5300_IDM_DR, data);
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spin_unlock_irqrestore(&priv->reg_lock, flags);
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}
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#if defined(CONFIG_WIZNET_BUS_DIRECT)
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#define w5300_read w5300_read_direct
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#define w5300_write w5300_write_direct
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#elif defined(CONFIG_WIZNET_BUS_INDIRECT)
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#define w5300_read w5300_read_indirect
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#define w5300_write w5300_write_indirect
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#else /* CONFIG_WIZNET_BUS_ANY */
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#define w5300_read priv->read
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#define w5300_write priv->write
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#endif
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static u32 w5300_read32(struct w5300_priv *priv, u16 addr)
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{
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u32 data;
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data = w5300_read(priv, addr) << 16;
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data |= w5300_read(priv, addr + 2);
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return data;
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}
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static void w5300_write32(struct w5300_priv *priv, u16 addr, u32 data)
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{
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w5300_write(priv, addr, data >> 16);
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w5300_write(priv, addr + 2, data);
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}
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static int w5300_command(struct w5300_priv *priv, u16 cmd)
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{
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unsigned long timeout = jiffies + msecs_to_jiffies(100);
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w5300_write(priv, W5300_S0_CR, cmd);
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while (w5300_read(priv, W5300_S0_CR) != 0) {
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if (time_after(jiffies, timeout))
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return -EIO;
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cpu_relax();
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}
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return 0;
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}
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static void w5300_read_frame(struct w5300_priv *priv, u8 *buf, int len)
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{
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u16 fifo;
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int i;
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for (i = 0; i < len; i += 2) {
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fifo = w5300_read(priv, W5300_S0_RX_FIFO);
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*buf++ = fifo >> 8;
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*buf++ = fifo;
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}
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fifo = w5300_read(priv, W5300_S0_RX_FIFO);
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fifo = w5300_read(priv, W5300_S0_RX_FIFO);
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}
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static void w5300_write_frame(struct w5300_priv *priv, u8 *buf, int len)
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{
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u16 fifo;
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int i;
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for (i = 0; i < len; i += 2) {
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fifo = *buf++ << 8;
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fifo |= *buf++;
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w5300_write(priv, W5300_S0_TX_FIFO, fifo);
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}
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w5300_write32(priv, W5300_S0_TX_WRSR, len);
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}
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static void w5300_write_macaddr(struct w5300_priv *priv)
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{
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struct net_device *ndev = priv->ndev;
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w5300_write32(priv, W5300_SHARL,
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ndev->dev_addr[0] << 24 |
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ndev->dev_addr[1] << 16 |
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ndev->dev_addr[2] << 8 |
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ndev->dev_addr[3]);
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w5300_write(priv, W5300_SHARH,
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ndev->dev_addr[4] << 8 |
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ndev->dev_addr[5]);
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}
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static void w5300_hw_reset(struct w5300_priv *priv)
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{
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w5300_write_direct(priv, W5300_MR, MR_RST);
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mdelay(5);
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w5300_write_direct(priv, W5300_MR, priv->indirect ?
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MR_WDF(7) | MR_PB | MR_IND :
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MR_WDF(7) | MR_PB);
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w5300_write(priv, W5300_IMR, 0);
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w5300_write_macaddr(priv);
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/* Configure 128K of internal memory
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* as 64K RX fifo and 64K TX fifo
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*/
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w5300_write32(priv, W5300_RMSRL, 64 << 24);
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w5300_write32(priv, W5300_RMSRH, 0);
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w5300_write32(priv, W5300_TMSRL, 64 << 24);
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w5300_write32(priv, W5300_TMSRH, 0);
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w5300_write(priv, W5300_MTYPE, 0x00ff);
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}
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static void w5300_hw_start(struct w5300_priv *priv)
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{
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w5300_write(priv, W5300_S0_MR, priv->promisc ?
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S0_MR_MACRAW : S0_MR_MACRAW_MF);
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w5300_command(priv, S0_CR_OPEN);
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w5300_write(priv, W5300_S0_IMR, S0_IR_RECV | S0_IR_SENDOK);
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w5300_write(priv, W5300_IMR, IR_S0);
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}
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static void w5300_hw_close(struct w5300_priv *priv)
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{
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w5300_write(priv, W5300_IMR, 0);
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w5300_command(priv, S0_CR_CLOSE);
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}
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/***********************************************************************
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*
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* Device driver functions / callbacks
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*
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***********************************************************************/
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static void w5300_get_drvinfo(struct net_device *ndev,
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struct ethtool_drvinfo *info)
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{
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strscpy(info->driver, DRV_NAME, sizeof(info->driver));
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strscpy(info->version, DRV_VERSION, sizeof(info->version));
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strscpy(info->bus_info, dev_name(ndev->dev.parent),
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sizeof(info->bus_info));
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}
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static u32 w5300_get_link(struct net_device *ndev)
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{
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struct w5300_priv *priv = netdev_priv(ndev);
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if (gpio_is_valid(priv->link_gpio))
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return !!gpio_get_value(priv->link_gpio);
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return 1;
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}
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static u32 w5300_get_msglevel(struct net_device *ndev)
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{
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struct w5300_priv *priv = netdev_priv(ndev);
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return priv->msg_enable;
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}
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static void w5300_set_msglevel(struct net_device *ndev, u32 value)
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{
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struct w5300_priv *priv = netdev_priv(ndev);
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priv->msg_enable = value;
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}
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static int w5300_get_regs_len(struct net_device *ndev)
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{
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return W5300_REGS_LEN;
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}
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static void w5300_get_regs(struct net_device *ndev,
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struct ethtool_regs *regs, void *_buf)
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{
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struct w5300_priv *priv = netdev_priv(ndev);
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u8 *buf = _buf;
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u16 addr;
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u16 data;
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regs->version = 1;
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for (addr = 0; addr < W5300_REGS_LEN; addr += 2) {
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switch (addr & 0x23f) {
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case W5300_S0_TX_FIFO: /* cannot read TX_FIFO */
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case W5300_S0_RX_FIFO: /* cannot read RX_FIFO */
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data = 0xffff;
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break;
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default:
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data = w5300_read(priv, addr);
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break;
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}
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*buf++ = data >> 8;
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*buf++ = data;
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}
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}
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static void w5300_tx_timeout(struct net_device *ndev, unsigned int txqueue)
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{
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struct w5300_priv *priv = netdev_priv(ndev);
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netif_stop_queue(ndev);
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w5300_hw_reset(priv);
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w5300_hw_start(priv);
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ndev->stats.tx_errors++;
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netif_trans_update(ndev);
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netif_wake_queue(ndev);
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}
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static netdev_tx_t w5300_start_tx(struct sk_buff *skb, struct net_device *ndev)
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{
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struct w5300_priv *priv = netdev_priv(ndev);
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netif_stop_queue(ndev);
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w5300_write_frame(priv, skb->data, skb->len);
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ndev->stats.tx_packets++;
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ndev->stats.tx_bytes += skb->len;
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dev_kfree_skb(skb);
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netif_dbg(priv, tx_queued, ndev, "tx queued\n");
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w5300_command(priv, S0_CR_SEND);
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return NETDEV_TX_OK;
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}
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static int w5300_napi_poll(struct napi_struct *napi, int budget)
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{
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struct w5300_priv *priv = container_of(napi, struct w5300_priv, napi);
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struct net_device *ndev = priv->ndev;
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struct sk_buff *skb;
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int rx_count;
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u16 rx_len;
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for (rx_count = 0; rx_count < budget; rx_count++) {
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u32 rx_fifo_len = w5300_read32(priv, W5300_S0_RX_RSR);
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if (rx_fifo_len == 0)
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break;
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rx_len = w5300_read(priv, W5300_S0_RX_FIFO);
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skb = netdev_alloc_skb_ip_align(ndev, roundup(rx_len, 2));
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if (unlikely(!skb)) {
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u32 i;
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for (i = 0; i < rx_fifo_len; i += 2)
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w5300_read(priv, W5300_S0_RX_FIFO);
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ndev->stats.rx_dropped++;
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return -ENOMEM;
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}
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skb_put(skb, rx_len);
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w5300_read_frame(priv, skb->data, rx_len);
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skb->protocol = eth_type_trans(skb, ndev);
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netif_receive_skb(skb);
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ndev->stats.rx_packets++;
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ndev->stats.rx_bytes += rx_len;
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}
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if (rx_count < budget) {
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napi_complete_done(napi, rx_count);
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w5300_write(priv, W5300_IMR, IR_S0);
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}
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return rx_count;
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}
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static irqreturn_t w5300_interrupt(int irq, void *ndev_instance)
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{
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struct net_device *ndev = ndev_instance;
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struct w5300_priv *priv = netdev_priv(ndev);
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int ir = w5300_read(priv, W5300_S0_IR);
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if (!ir)
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return IRQ_NONE;
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w5300_write(priv, W5300_S0_IR, ir);
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if (ir & S0_IR_SENDOK) {
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netif_dbg(priv, tx_done, ndev, "tx done\n");
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netif_wake_queue(ndev);
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}
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if (ir & S0_IR_RECV) {
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if (napi_schedule_prep(&priv->napi)) {
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w5300_write(priv, W5300_IMR, 0);
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__napi_schedule(&priv->napi);
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}
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}
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return IRQ_HANDLED;
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}
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static irqreturn_t w5300_detect_link(int irq, void *ndev_instance)
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{
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struct net_device *ndev = ndev_instance;
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struct w5300_priv *priv = netdev_priv(ndev);
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if (netif_running(ndev)) {
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if (gpio_get_value(priv->link_gpio) != 0) {
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netif_info(priv, link, ndev, "link is up\n");
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netif_carrier_on(ndev);
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} else {
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netif_info(priv, link, ndev, "link is down\n");
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netif_carrier_off(ndev);
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}
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}
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return IRQ_HANDLED;
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}
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static void w5300_set_rx_mode(struct net_device *ndev)
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{
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struct w5300_priv *priv = netdev_priv(ndev);
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bool set_promisc = (ndev->flags & IFF_PROMISC) != 0;
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if (priv->promisc != set_promisc) {
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priv->promisc = set_promisc;
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w5300_hw_start(priv);
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}
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}
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static int w5300_set_macaddr(struct net_device *ndev, void *addr)
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{
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struct w5300_priv *priv = netdev_priv(ndev);
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struct sockaddr *sock_addr = addr;
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if (!is_valid_ether_addr(sock_addr->sa_data))
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return -EADDRNOTAVAIL;
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eth_hw_addr_set(ndev, sock_addr->sa_data);
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w5300_write_macaddr(priv);
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return 0;
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}
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static int w5300_open(struct net_device *ndev)
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{
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struct w5300_priv *priv = netdev_priv(ndev);
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netif_info(priv, ifup, ndev, "enabling\n");
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w5300_hw_start(priv);
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napi_enable(&priv->napi);
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netif_start_queue(ndev);
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if (!gpio_is_valid(priv->link_gpio) ||
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gpio_get_value(priv->link_gpio) != 0)
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netif_carrier_on(ndev);
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return 0;
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}
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static int w5300_stop(struct net_device *ndev)
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{
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struct w5300_priv *priv = netdev_priv(ndev);
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netif_info(priv, ifdown, ndev, "shutting down\n");
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w5300_hw_close(priv);
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netif_carrier_off(ndev);
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netif_stop_queue(ndev);
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napi_disable(&priv->napi);
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return 0;
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}
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static const struct ethtool_ops w5300_ethtool_ops = {
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.get_drvinfo = w5300_get_drvinfo,
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.get_msglevel = w5300_get_msglevel,
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.set_msglevel = w5300_set_msglevel,
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.get_link = w5300_get_link,
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.get_regs_len = w5300_get_regs_len,
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.get_regs = w5300_get_regs,
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};
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static const struct net_device_ops w5300_netdev_ops = {
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.ndo_open = w5300_open,
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.ndo_stop = w5300_stop,
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.ndo_start_xmit = w5300_start_tx,
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.ndo_tx_timeout = w5300_tx_timeout,
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.ndo_set_rx_mode = w5300_set_rx_mode,
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.ndo_set_mac_address = w5300_set_macaddr,
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.ndo_validate_addr = eth_validate_addr,
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};
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static int w5300_hw_probe(struct platform_device *pdev)
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{
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struct wiznet_platform_data *data = dev_get_platdata(&pdev->dev);
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struct net_device *ndev = platform_get_drvdata(pdev);
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struct w5300_priv *priv = netdev_priv(ndev);
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const char *name = netdev_name(ndev);
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struct resource *mem;
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int mem_size;
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int irq;
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int ret;
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if (data && is_valid_ether_addr(data->mac_addr)) {
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eth_hw_addr_set(ndev, data->mac_addr);
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} else {
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eth_hw_addr_random(ndev);
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}
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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priv->base = devm_ioremap_resource(&pdev->dev, mem);
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if (IS_ERR(priv->base))
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return PTR_ERR(priv->base);
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mem_size = resource_size(mem);
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spin_lock_init(&priv->reg_lock);
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priv->indirect = mem_size < W5300_BUS_DIRECT_SIZE;
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if (priv->indirect) {
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priv->read = w5300_read_indirect;
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priv->write = w5300_write_indirect;
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} else {
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priv->read = w5300_read_direct;
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priv->write = w5300_write_direct;
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}
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w5300_hw_reset(priv);
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if (w5300_read(priv, W5300_IDR) != IDR_W5300)
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return -ENODEV;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
|
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return irq;
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ret = request_irq(irq, w5300_interrupt,
|
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IRQ_TYPE_LEVEL_LOW, name, ndev);
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if (ret < 0)
|
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return ret;
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priv->irq = irq;
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priv->link_gpio = data ? data->link_gpio : -EINVAL;
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if (gpio_is_valid(priv->link_gpio)) {
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char *link_name = devm_kzalloc(&pdev->dev, 16, GFP_KERNEL);
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if (!link_name)
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return -ENOMEM;
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snprintf(link_name, 16, "%s-link", name);
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priv->link_irq = gpio_to_irq(priv->link_gpio);
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if (request_any_context_irq(priv->link_irq, w5300_detect_link,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
|
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link_name, priv->ndev) < 0)
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priv->link_gpio = -EINVAL;
|
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}
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|
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netdev_info(ndev, "at 0x%llx irq %d\n", (u64)mem->start, irq);
|
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return 0;
|
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}
|
|
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static int w5300_probe(struct platform_device *pdev)
|
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{
|
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struct w5300_priv *priv;
|
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struct net_device *ndev;
|
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int err;
|
|
|
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ndev = alloc_etherdev(sizeof(*priv));
|
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if (!ndev)
|
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return -ENOMEM;
|
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SET_NETDEV_DEV(ndev, &pdev->dev);
|
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platform_set_drvdata(pdev, ndev);
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priv = netdev_priv(ndev);
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priv->ndev = ndev;
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ndev->netdev_ops = &w5300_netdev_ops;
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ndev->ethtool_ops = &w5300_ethtool_ops;
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ndev->watchdog_timeo = HZ;
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netif_napi_add_weight(ndev, &priv->napi, w5300_napi_poll, 16);
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|
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/* This chip doesn't support VLAN packets with normal MTU,
|
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* so disable VLAN for this device.
|
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*/
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ndev->features |= NETIF_F_VLAN_CHALLENGED;
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err = register_netdev(ndev);
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if (err < 0)
|
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goto err_register;
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|
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err = w5300_hw_probe(pdev);
|
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if (err < 0)
|
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goto err_hw_probe;
|
|
|
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return 0;
|
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|
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err_hw_probe:
|
|
unregister_netdev(ndev);
|
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err_register:
|
|
free_netdev(ndev);
|
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return err;
|
|
}
|
|
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static int w5300_remove(struct platform_device *pdev)
|
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{
|
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struct net_device *ndev = platform_get_drvdata(pdev);
|
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struct w5300_priv *priv = netdev_priv(ndev);
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|
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w5300_hw_reset(priv);
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free_irq(priv->irq, ndev);
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if (gpio_is_valid(priv->link_gpio))
|
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free_irq(priv->link_irq, ndev);
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|
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unregister_netdev(ndev);
|
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free_netdev(ndev);
|
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return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
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static int w5300_suspend(struct device *dev)
|
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{
|
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struct net_device *ndev = dev_get_drvdata(dev);
|
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struct w5300_priv *priv = netdev_priv(ndev);
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|
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if (netif_running(ndev)) {
|
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netif_carrier_off(ndev);
|
|
netif_device_detach(ndev);
|
|
|
|
w5300_hw_close(priv);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int w5300_resume(struct device *dev)
|
|
{
|
|
struct net_device *ndev = dev_get_drvdata(dev);
|
|
struct w5300_priv *priv = netdev_priv(ndev);
|
|
|
|
if (!netif_running(ndev)) {
|
|
w5300_hw_reset(priv);
|
|
w5300_hw_start(priv);
|
|
|
|
netif_device_attach(ndev);
|
|
if (!gpio_is_valid(priv->link_gpio) ||
|
|
gpio_get_value(priv->link_gpio) != 0)
|
|
netif_carrier_on(ndev);
|
|
}
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
|
|
static SIMPLE_DEV_PM_OPS(w5300_pm_ops, w5300_suspend, w5300_resume);
|
|
|
|
static struct platform_driver w5300_driver = {
|
|
.driver = {
|
|
.name = DRV_NAME,
|
|
.pm = &w5300_pm_ops,
|
|
},
|
|
.probe = w5300_probe,
|
|
.remove = w5300_remove,
|
|
};
|
|
|
|
module_platform_driver(w5300_driver);
|