mirror of https://gitee.com/openkylin/linux.git
358 lines
9.8 KiB
C
358 lines
9.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* drivers/net/ethernet/micrel/ks8851.c
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*
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* Copyright 2009 Simtec Electronics
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* http://www.simtec.co.uk/
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* Ben Dooks <ben@simtec.co.uk>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#define DEBUG
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/ethtool.h>
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#include <linux/iopoll.h>
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#include <linux/mii.h>
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#include <linux/platform_device.h>
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#include <linux/of_net.h>
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#include "ks8851.h"
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static int msg_enable;
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#define BE3 0x8000 /* Byte Enable 3 */
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#define BE2 0x4000 /* Byte Enable 2 */
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#define BE1 0x2000 /* Byte Enable 1 */
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#define BE0 0x1000 /* Byte Enable 0 */
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/**
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* struct ks8851_net_par - KS8851 Parallel driver private data
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* @ks8851: KS8851 driver common private data
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* @lock: Lock to ensure that the device is not accessed when busy.
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* @hw_addr : start address of data register.
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* @hw_addr_cmd : start address of command register.
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* @cmd_reg_cache : command register cached.
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*
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* The @lock ensures that the chip is protected when certain operations are
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* in progress. When the read or write packet transfer is in progress, most
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* of the chip registers are not accessible until the transfer is finished
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* and the DMA has been de-asserted.
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*/
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struct ks8851_net_par {
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struct ks8851_net ks8851;
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spinlock_t lock;
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void __iomem *hw_addr;
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void __iomem *hw_addr_cmd;
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u16 cmd_reg_cache;
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};
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#define to_ks8851_par(ks) container_of((ks), struct ks8851_net_par, ks8851)
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/**
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* ks8851_lock_par - register access lock
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* @ks: The chip state
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* @flags: Spinlock flags
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*
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* Claim chip register access lock
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*/
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static void ks8851_lock_par(struct ks8851_net *ks, unsigned long *flags)
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{
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struct ks8851_net_par *ksp = to_ks8851_par(ks);
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spin_lock_irqsave(&ksp->lock, *flags);
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}
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/**
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* ks8851_unlock_par - register access unlock
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* @ks: The chip state
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* @flags: Spinlock flags
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*
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* Release chip register access lock
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*/
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static void ks8851_unlock_par(struct ks8851_net *ks, unsigned long *flags)
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{
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struct ks8851_net_par *ksp = to_ks8851_par(ks);
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spin_unlock_irqrestore(&ksp->lock, *flags);
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}
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/**
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* ks_check_endian - Check whether endianness of the bus is correct
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* @ks : The chip information
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*
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* The KS8851-16MLL EESK pin allows selecting the endianness of the 16bit
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* bus. To maintain optimum performance, the bus endianness should be set
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* such that it matches the endianness of the CPU.
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*/
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static int ks_check_endian(struct ks8851_net *ks)
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{
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struct ks8851_net_par *ksp = to_ks8851_par(ks);
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u16 cider;
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/*
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* Read CIDER register first, however read it the "wrong" way around.
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* If the endian strap on the KS8851-16MLL in incorrect and the chip
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* is operating in different endianness than the CPU, then the meaning
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* of BE[3:0] byte-enable bits is also swapped such that:
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* BE[3,2,1,0] becomes BE[1,0,3,2]
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*
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* Luckily for us, the byte-enable bits are the top four MSbits of
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* the address register and the CIDER register is at offset 0xc0.
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* Hence, by reading address 0xc0c0, which is not impacted by endian
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* swapping, we assert either BE[3:2] or BE[1:0] while reading the
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* CIDER register.
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*
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* If the bus configuration is correct, reading 0xc0c0 asserts
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* BE[3:2] and this read returns 0x0000, because to read register
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* with bottom two LSbits of address set to 0, BE[1:0] must be
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* asserted.
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*
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* If the bus configuration is NOT correct, reading 0xc0c0 asserts
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* BE[1:0] and this read returns non-zero 0x8872 value.
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*/
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iowrite16(BE3 | BE2 | KS_CIDER, ksp->hw_addr_cmd);
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cider = ioread16(ksp->hw_addr);
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if (!cider)
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return 0;
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netdev_err(ks->netdev, "incorrect EESK endian strap setting\n");
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return -EINVAL;
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}
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/**
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* ks8851_wrreg16_par - write 16bit register value to chip
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* @ks: The chip state
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* @reg: The register address
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* @val: The value to write
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*
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* Issue a write to put the value @val into the register specified in @reg.
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*/
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static void ks8851_wrreg16_par(struct ks8851_net *ks, unsigned int reg,
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unsigned int val)
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{
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struct ks8851_net_par *ksp = to_ks8851_par(ks);
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ksp->cmd_reg_cache = (u16)reg | ((BE1 | BE0) << (reg & 0x02));
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iowrite16(ksp->cmd_reg_cache, ksp->hw_addr_cmd);
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iowrite16(val, ksp->hw_addr);
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}
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/**
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* ks8851_rdreg16_par - read 16 bit register from chip
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* @ks: The chip information
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* @reg: The register address
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*
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* Read a 16bit register from the chip, returning the result
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*/
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static unsigned int ks8851_rdreg16_par(struct ks8851_net *ks, unsigned int reg)
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{
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struct ks8851_net_par *ksp = to_ks8851_par(ks);
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ksp->cmd_reg_cache = (u16)reg | ((BE1 | BE0) << (reg & 0x02));
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iowrite16(ksp->cmd_reg_cache, ksp->hw_addr_cmd);
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return ioread16(ksp->hw_addr);
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}
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/**
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* ks8851_rdfifo_par - read data from the receive fifo
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* @ks: The device state.
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* @buff: The buffer address
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* @len: The length of the data to read
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*
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* Issue an RXQ FIFO read command and read the @len amount of data from
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* the FIFO into the buffer specified by @buff.
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*/
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static void ks8851_rdfifo_par(struct ks8851_net *ks, u8 *buff, unsigned int len)
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{
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struct ks8851_net_par *ksp = to_ks8851_par(ks);
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netif_dbg(ks, rx_status, ks->netdev,
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"%s: %d@%p\n", __func__, len, buff);
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ioread16_rep(ksp->hw_addr, (u16 *)buff + 1, len / 2);
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}
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/**
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* ks8851_wrfifo_par - write packet to TX FIFO
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* @ks: The device state.
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* @txp: The sk_buff to transmit.
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* @irq: IRQ on completion of the packet.
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*
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* Send the @txp to the chip. This means creating the relevant packet header
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* specifying the length of the packet and the other information the chip
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* needs, such as IRQ on completion. Send the header and the packet data to
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* the device.
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*/
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static void ks8851_wrfifo_par(struct ks8851_net *ks, struct sk_buff *txp,
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bool irq)
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{
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struct ks8851_net_par *ksp = to_ks8851_par(ks);
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unsigned int len = ALIGN(txp->len, 4);
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unsigned int fid = 0;
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netif_dbg(ks, tx_queued, ks->netdev, "%s: skb %p, %d@%p, irq %d\n",
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__func__, txp, txp->len, txp->data, irq);
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fid = ks->fid++;
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fid &= TXFR_TXFID_MASK;
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if (irq)
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fid |= TXFR_TXIC; /* irq on completion */
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iowrite16(fid, ksp->hw_addr);
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iowrite16(txp->len, ksp->hw_addr);
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iowrite16_rep(ksp->hw_addr, txp->data, len / 2);
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}
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/**
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* ks8851_rx_skb_par - receive skbuff
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* @ks: The device state.
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* @skb: The skbuff
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*/
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static void ks8851_rx_skb_par(struct ks8851_net *ks, struct sk_buff *skb)
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{
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netif_rx(skb);
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}
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static unsigned int ks8851_rdreg16_par_txqcr(struct ks8851_net *ks)
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{
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return ks8851_rdreg16_par(ks, KS_TXQCR);
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}
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/**
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* ks8851_start_xmit_par - transmit packet
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* @skb: The buffer to transmit
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* @dev: The device used to transmit the packet.
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*
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* Called by the network layer to transmit the @skb. Queue the packet for
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* the device and schedule the necessary work to transmit the packet when
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* it is free.
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*
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* We do this to firstly avoid sleeping with the network device locked,
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* and secondly so we can round up more than one packet to transmit which
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* means we can try and avoid generating too many transmit done interrupts.
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*/
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static netdev_tx_t ks8851_start_xmit_par(struct sk_buff *skb,
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struct net_device *dev)
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{
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struct ks8851_net *ks = netdev_priv(dev);
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netdev_tx_t ret = NETDEV_TX_OK;
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unsigned long flags;
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unsigned int txqcr;
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u16 txmir;
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int err;
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netif_dbg(ks, tx_queued, ks->netdev,
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"%s: skb %p, %d@%p\n", __func__, skb, skb->len, skb->data);
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ks8851_lock_par(ks, &flags);
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txmir = ks8851_rdreg16_par(ks, KS_TXMIR) & 0x1fff;
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if (likely(txmir >= skb->len + 12)) {
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ks8851_wrreg16_par(ks, KS_RXQCR, ks->rc_rxqcr | RXQCR_SDA);
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ks8851_wrfifo_par(ks, skb, false);
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ks8851_wrreg16_par(ks, KS_RXQCR, ks->rc_rxqcr);
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ks8851_wrreg16_par(ks, KS_TXQCR, TXQCR_METFE);
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err = readx_poll_timeout_atomic(ks8851_rdreg16_par_txqcr, ks,
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txqcr, !(txqcr & TXQCR_METFE),
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5, 1000000);
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if (err)
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ret = NETDEV_TX_BUSY;
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ks8851_done_tx(ks, skb);
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} else {
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ret = NETDEV_TX_BUSY;
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}
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ks8851_unlock_par(ks, &flags);
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return ret;
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}
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static int ks8851_probe_par(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct ks8851_net_par *ksp;
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struct net_device *netdev;
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struct ks8851_net *ks;
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int ret;
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netdev = devm_alloc_etherdev(dev, sizeof(struct ks8851_net_par));
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if (!netdev)
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return -ENOMEM;
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ks = netdev_priv(netdev);
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ks->lock = ks8851_lock_par;
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ks->unlock = ks8851_unlock_par;
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ks->rdreg16 = ks8851_rdreg16_par;
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ks->wrreg16 = ks8851_wrreg16_par;
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ks->rdfifo = ks8851_rdfifo_par;
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ks->wrfifo = ks8851_wrfifo_par;
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ks->start_xmit = ks8851_start_xmit_par;
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ks->rx_skb = ks8851_rx_skb_par;
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#define STD_IRQ (IRQ_LCI | /* Link Change */ \
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IRQ_RXI | /* RX done */ \
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IRQ_RXPSI) /* RX process stop */
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ks->rc_ier = STD_IRQ;
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ksp = to_ks8851_par(ks);
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spin_lock_init(&ksp->lock);
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ksp->hw_addr = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(ksp->hw_addr))
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return PTR_ERR(ksp->hw_addr);
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ksp->hw_addr_cmd = devm_platform_ioremap_resource(pdev, 1);
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if (IS_ERR(ksp->hw_addr_cmd))
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return PTR_ERR(ksp->hw_addr_cmd);
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ret = ks_check_endian(ks);
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if (ret)
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return ret;
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netdev->irq = platform_get_irq(pdev, 0);
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return ks8851_probe_common(netdev, dev, msg_enable);
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}
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static int ks8851_remove_par(struct platform_device *pdev)
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{
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return ks8851_remove_common(&pdev->dev);
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}
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static const struct of_device_id ks8851_match_table[] = {
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{ .compatible = "micrel,ks8851-mll" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, ks8851_match_table);
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static struct platform_driver ks8851_driver = {
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.driver = {
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.name = "ks8851",
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.of_match_table = ks8851_match_table,
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.pm = &ks8851_pm_ops,
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},
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.probe = ks8851_probe_par,
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.remove = ks8851_remove_par,
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};
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module_platform_driver(ks8851_driver);
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MODULE_DESCRIPTION("KS8851 Network driver");
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MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
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MODULE_LICENSE("GPL");
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module_param_named(message, msg_enable, int, 0);
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MODULE_PARM_DESC(message, "Message verbosity level (0=none, 31=all)");
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