484 lines
12 KiB
C
484 lines
12 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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#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/cache.h>
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#include <linux/crc32.h>
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#include <linux/mii.h>
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#include <linux/regulator/consumer.h>
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#include <linux/spi/spi.h>
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#include <linux/gpio.h>
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#include <linux/of_gpio.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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/**
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* struct ks8851_net_spi - KS8851 SPI driver private data
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* @lock: Lock to ensure that the device is not accessed when busy.
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* @tx_work: Work queue for tx packets
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* @ks8851: KS8851 driver common private data
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* @spidev: The spi device we're bound to.
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* @spi_msg1: pre-setup SPI transfer with one message, @spi_xfer1.
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* @spi_msg2: pre-setup SPI transfer with two messages, @spi_xfer2.
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* @spi_xfer1: @spi_msg1 SPI transfer structure
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* @spi_xfer2: @spi_msg2 SPI transfer structure
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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 ccessible until the transfer is finished and
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* the DMA has been de-asserted.
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*/
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struct ks8851_net_spi {
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struct ks8851_net ks8851;
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struct mutex lock;
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struct work_struct tx_work;
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struct spi_device *spidev;
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struct spi_message spi_msg1;
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struct spi_message spi_msg2;
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struct spi_transfer spi_xfer1;
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struct spi_transfer spi_xfer2[2];
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};
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#define to_ks8851_spi(ks) container_of((ks), struct ks8851_net_spi, ks8851)
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/* SPI frame opcodes */
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#define KS_SPIOP_RD 0x00
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#define KS_SPIOP_WR 0x40
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#define KS_SPIOP_RXFIFO 0x80
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#define KS_SPIOP_TXFIFO 0xC0
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/* shift for byte-enable data */
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#define BYTE_EN(_x) ((_x) << 2)
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/* turn register number and byte-enable mask into data for start of packet */
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#define MK_OP(_byteen, _reg) \
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(BYTE_EN(_byteen) | (_reg) << (8 + 2) | (_reg) >> 6)
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/**
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* ks8851_lock_spi - 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_spi(struct ks8851_net *ks, unsigned long *flags)
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{
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struct ks8851_net_spi *kss = to_ks8851_spi(ks);
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mutex_lock(&kss->lock);
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}
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/**
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* ks8851_unlock_spi - 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_spi(struct ks8851_net *ks, unsigned long *flags)
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{
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struct ks8851_net_spi *kss = to_ks8851_spi(ks);
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mutex_unlock(&kss->lock);
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}
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/* SPI register read/write calls.
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*
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* All these calls issue SPI transactions to access the chip's registers. They
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* all require that the necessary lock is held to prevent accesses when the
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* chip is busy transferring packet data (RX/TX FIFO accesses).
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*/
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/**
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* ks8851_wrreg16_spi - write 16bit register value to chip via SPI
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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_spi(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_spi *kss = to_ks8851_spi(ks);
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struct spi_transfer *xfer = &kss->spi_xfer1;
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struct spi_message *msg = &kss->spi_msg1;
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__le16 txb[2];
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int ret;
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txb[0] = cpu_to_le16(MK_OP(reg & 2 ? 0xC : 0x03, reg) | KS_SPIOP_WR);
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txb[1] = cpu_to_le16(val);
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xfer->tx_buf = txb;
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xfer->rx_buf = NULL;
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xfer->len = 4;
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ret = spi_sync(kss->spidev, msg);
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if (ret < 0)
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netdev_err(ks->netdev, "spi_sync() failed\n");
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}
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/**
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* ks8851_rdreg - issue read register command and return the data
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* @ks: The device state
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* @op: The register address and byte enables in message format.
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* @rxb: The RX buffer to return the result into
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* @rxl: The length of data expected.
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*
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* This is the low level read call that issues the necessary spi message(s)
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* to read data from the register specified in @op.
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*/
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static void ks8851_rdreg(struct ks8851_net *ks, unsigned int op,
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u8 *rxb, unsigned int rxl)
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{
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struct ks8851_net_spi *kss = to_ks8851_spi(ks);
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struct spi_transfer *xfer;
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struct spi_message *msg;
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__le16 *txb = (__le16 *)ks->txd;
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u8 *trx = ks->rxd;
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int ret;
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txb[0] = cpu_to_le16(op | KS_SPIOP_RD);
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if (kss->spidev->controller->flags & SPI_CONTROLLER_HALF_DUPLEX) {
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msg = &kss->spi_msg2;
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xfer = kss->spi_xfer2;
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xfer->tx_buf = txb;
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xfer->rx_buf = NULL;
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xfer->len = 2;
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xfer++;
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xfer->tx_buf = NULL;
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xfer->rx_buf = trx;
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xfer->len = rxl;
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} else {
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msg = &kss->spi_msg1;
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xfer = &kss->spi_xfer1;
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xfer->tx_buf = txb;
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xfer->rx_buf = trx;
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xfer->len = rxl + 2;
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}
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ret = spi_sync(kss->spidev, msg);
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if (ret < 0)
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netdev_err(ks->netdev, "read: spi_sync() failed\n");
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else if (kss->spidev->controller->flags & SPI_CONTROLLER_HALF_DUPLEX)
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memcpy(rxb, trx, rxl);
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else
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memcpy(rxb, trx + 2, rxl);
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}
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/**
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* ks8851_rdreg16_spi - read 16 bit register from device via SPI
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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_spi(struct ks8851_net *ks, unsigned int reg)
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{
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__le16 rx = 0;
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ks8851_rdreg(ks, MK_OP(reg & 2 ? 0xC : 0x3, reg), (u8 *)&rx, 2);
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return le16_to_cpu(rx);
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}
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/**
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* ks8851_rdfifo_spi - read data from the receive fifo via SPI
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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_spi(struct ks8851_net *ks, u8 *buff, unsigned int len)
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{
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struct ks8851_net_spi *kss = to_ks8851_spi(ks);
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struct spi_transfer *xfer = kss->spi_xfer2;
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struct spi_message *msg = &kss->spi_msg2;
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u8 txb[1];
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int ret;
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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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/* set the operation we're issuing */
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txb[0] = KS_SPIOP_RXFIFO;
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xfer->tx_buf = txb;
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xfer->rx_buf = NULL;
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xfer->len = 1;
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xfer++;
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xfer->rx_buf = buff;
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xfer->tx_buf = NULL;
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xfer->len = len;
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ret = spi_sync(kss->spidev, msg);
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if (ret < 0)
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netdev_err(ks->netdev, "%s: spi_sync() failed\n", __func__);
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}
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/**
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* ks8851_wrfifo_spi - write packet to TX FIFO via SPI
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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_spi(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_spi *kss = to_ks8851_spi(ks);
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struct spi_transfer *xfer = kss->spi_xfer2;
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struct spi_message *msg = &kss->spi_msg2;
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unsigned int fid = 0;
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int ret;
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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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/* start header at txb[1] to align txw entries */
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ks->txh.txb[1] = KS_SPIOP_TXFIFO;
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ks->txh.txw[1] = cpu_to_le16(fid);
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ks->txh.txw[2] = cpu_to_le16(txp->len);
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xfer->tx_buf = &ks->txh.txb[1];
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xfer->rx_buf = NULL;
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xfer->len = 5;
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xfer++;
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xfer->tx_buf = txp->data;
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xfer->rx_buf = NULL;
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xfer->len = ALIGN(txp->len, 4);
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ret = spi_sync(kss->spidev, msg);
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if (ret < 0)
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netdev_err(ks->netdev, "%s: spi_sync() failed\n", __func__);
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}
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/**
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* calc_txlen - calculate size of message to send packet
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* @len: Length of data
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*
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* Returns the size of the TXFIFO message needed to send
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* this packet.
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*/
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static unsigned int calc_txlen(unsigned int len)
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{
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return ALIGN(len + 4, 4);
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}
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/**
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* ks8851_tx_work - process tx packet(s)
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* @work: The work strucutre what was scheduled.
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*
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* This is called when a number of packets have been scheduled for
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* transmission and need to be sent to the device.
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*/
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static void ks8851_tx_work(struct work_struct *work)
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{
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unsigned int dequeued_len = 0;
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struct ks8851_net_spi *kss;
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unsigned short tx_space;
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struct ks8851_net *ks;
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unsigned long flags;
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struct sk_buff *txb;
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bool last;
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kss = container_of(work, struct ks8851_net_spi, tx_work);
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ks = &kss->ks8851;
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last = skb_queue_empty(&ks->txq);
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ks8851_lock_spi(ks, &flags);
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while (!last) {
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txb = skb_dequeue(&ks->txq);
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last = skb_queue_empty(&ks->txq);
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if (txb) {
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dequeued_len += calc_txlen(txb->len);
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ks8851_wrreg16_spi(ks, KS_RXQCR,
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ks->rc_rxqcr | RXQCR_SDA);
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ks8851_wrfifo_spi(ks, txb, last);
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ks8851_wrreg16_spi(ks, KS_RXQCR, ks->rc_rxqcr);
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ks8851_wrreg16_spi(ks, KS_TXQCR, TXQCR_METFE);
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ks8851_done_tx(ks, txb);
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}
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}
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tx_space = ks8851_rdreg16_spi(ks, KS_TXMIR);
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spin_lock(&ks->statelock);
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ks->queued_len -= dequeued_len;
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ks->tx_space = tx_space;
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spin_unlock(&ks->statelock);
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ks8851_unlock_spi(ks, &flags);
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}
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/**
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* ks8851_flush_tx_work_spi - flush outstanding TX work
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* @ks: The device state
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*/
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static void ks8851_flush_tx_work_spi(struct ks8851_net *ks)
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{
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struct ks8851_net_spi *kss = to_ks8851_spi(ks);
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flush_work(&kss->tx_work);
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}
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/**
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* ks8851_start_xmit_spi - transmit packet using SPI
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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_spi(struct sk_buff *skb,
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struct net_device *dev)
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{
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unsigned int needed = calc_txlen(skb->len);
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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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struct ks8851_net_spi *kss;
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kss = to_ks8851_spi(ks);
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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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spin_lock(&ks->statelock);
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if (ks->queued_len + needed > ks->tx_space) {
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netif_stop_queue(dev);
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ret = NETDEV_TX_BUSY;
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} else {
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ks->queued_len += needed;
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skb_queue_tail(&ks->txq, skb);
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}
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spin_unlock(&ks->statelock);
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if (ret == NETDEV_TX_OK)
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schedule_work(&kss->tx_work);
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return ret;
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}
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static int ks8851_probe_spi(struct spi_device *spi)
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{
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struct device *dev = &spi->dev;
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struct ks8851_net_spi *kss;
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struct net_device *netdev;
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struct ks8851_net *ks;
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netdev = devm_alloc_etherdev(dev, sizeof(struct ks8851_net_spi));
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if (!netdev)
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return -ENOMEM;
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spi->bits_per_word = 8;
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kss = netdev_priv(netdev);
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ks = &kss->ks8851;
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ks->lock = ks8851_lock_spi;
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ks->unlock = ks8851_unlock_spi;
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ks->rdreg16 = ks8851_rdreg16_spi;
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ks->wrreg16 = ks8851_wrreg16_spi;
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ks->rdfifo = ks8851_rdfifo_spi;
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ks->wrfifo = ks8851_wrfifo_spi;
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ks->start_xmit = ks8851_start_xmit_spi;
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ks->flush_tx_work = ks8851_flush_tx_work_spi;
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#define STD_IRQ (IRQ_LCI | /* Link Change */ \
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IRQ_TXI | /* TX done */ \
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IRQ_RXI | /* RX done */ \
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IRQ_SPIBEI | /* SPI bus error */ \
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IRQ_TXPSI | /* TX process stop */ \
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IRQ_RXPSI) /* RX process stop */
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ks->rc_ier = STD_IRQ;
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kss->spidev = spi;
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mutex_init(&kss->lock);
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INIT_WORK(&kss->tx_work, ks8851_tx_work);
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/* initialise pre-made spi transfer messages */
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spi_message_init(&kss->spi_msg1);
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spi_message_add_tail(&kss->spi_xfer1, &kss->spi_msg1);
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spi_message_init(&kss->spi_msg2);
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spi_message_add_tail(&kss->spi_xfer2[0], &kss->spi_msg2);
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spi_message_add_tail(&kss->spi_xfer2[1], &kss->spi_msg2);
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netdev->irq = spi->irq;
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return ks8851_probe_common(netdev, dev, msg_enable);
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}
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static void ks8851_remove_spi(struct spi_device *spi)
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{
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ks8851_remove_common(&spi->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" },
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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 spi_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_spi,
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.remove = ks8851_remove_spi,
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};
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module_spi_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)");
|
|
MODULE_ALIAS("spi:ks8851");
|