From patchwork Sat Mar 28 00:31:46 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marek Vasut X-Patchwork-Id: 221678 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 05BE6C43331 for ; Sat, 28 Mar 2020 00:32:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BA0892071B for ; Sat, 28 Mar 2020 00:32:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726134AbgC1Acd (ORCPT ); Fri, 27 Mar 2020 20:32:33 -0400 Received: from mail-out.m-online.net ([212.18.0.10]:58887 "EHLO mail-out.m-online.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727406AbgC1Aca (ORCPT ); Fri, 27 Mar 2020 20:32:30 -0400 Received: from frontend01.mail.m-online.net (unknown [192.168.8.182]) by mail-out.m-online.net (Postfix) with ESMTP id 48q06f2HKGz1rpF7; Sat, 28 Mar 2020 01:32:26 +0100 (CET) Received: from localhost (dynscan1.mnet-online.de [192.168.6.70]) by mail.m-online.net (Postfix) with ESMTP id 48q06f220jz1qv4F; Sat, 28 Mar 2020 01:32:26 +0100 (CET) X-Virus-Scanned: amavisd-new at mnet-online.de Received: from mail.mnet-online.de ([192.168.8.182]) by localhost (dynscan1.mail.m-online.net [192.168.6.70]) (amavisd-new, port 10024) with ESMTP id lEwOroZV0Mva; Sat, 28 Mar 2020 01:32:23 +0100 (CET) X-Auth-Info: LyTWZwHBKjQGcxZ223r61oZgI+7yrL4kHPQtWiqIHxo= Received: from desktop.lan (ip-86-49-35-8.net.upcbroadband.cz [86.49.35.8]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.mnet-online.de (Postfix) with ESMTPSA; Sat, 28 Mar 2020 01:32:23 +0100 (CET) From: Marek Vasut To: netdev@vger.kernel.org Cc: Marek Vasut , "David S . Miller" , Lukas Wunner , Petr Stetiar , YueHaibing Subject: [PATCH V3 16/18] net: ks8851: Separate SPI operations into separate file Date: Sat, 28 Mar 2020 01:31:46 +0100 Message-Id: <20200328003148.498021-17-marex@denx.de> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200328003148.498021-1-marex@denx.de> References: <20200328003148.498021-1-marex@denx.de> MIME-Version: 1.0 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Pull all the SPI bus specific code into a separate file, so that it is not mixed with the common code. Rename ks8851.c to ks8851_common.c. The ks8851_common.c is linked with ks8851_spi.c now, so it can call the accessors in the ks8851_spi.c without any pointer indirection. Signed-off-by: Marek Vasut Cc: David S. Miller Cc: Lukas Wunner Cc: Petr Stetiar Cc: YueHaibing --- V2: Get rid of the pointer indirection V3: Rename ks8851.c to ks8851_common.c and adjust Makefile to permit module to be built --- drivers/net/ethernet/micrel/Makefile | 1 + drivers/net/ethernet/micrel/ks8851.h | 140 +++++ .../micrel/{ks8851.c => ks8851_common.c} | 537 +----------------- drivers/net/ethernet/micrel/ks8851_spi.c | 448 +++++++++++++++ 4 files changed, 593 insertions(+), 533 deletions(-) rename drivers/net/ethernet/micrel/{ks8851.c => ks8851_common.c} (66%) create mode 100644 drivers/net/ethernet/micrel/ks8851_spi.c diff --git a/drivers/net/ethernet/micrel/Makefile b/drivers/net/ethernet/micrel/Makefile index 6d8ac5527aef..c7a4725c2e95 100644 --- a/drivers/net/ethernet/micrel/Makefile +++ b/drivers/net/ethernet/micrel/Makefile @@ -5,5 +5,6 @@ obj-$(CONFIG_KS8842) += ks8842.o obj-$(CONFIG_KS8851) += ks8851.o +ks8851-objs = ks8851_common.o ks8851_spi.o obj-$(CONFIG_KS8851_MLL) += ks8851_mll.o obj-$(CONFIG_KSZ884X_PCI) += ksz884x.o diff --git a/drivers/net/ethernet/micrel/ks8851.h b/drivers/net/ethernet/micrel/ks8851.h index f210d18a10b5..7932996c6ec4 100644 --- a/drivers/net/ethernet/micrel/ks8851.h +++ b/drivers/net/ethernet/micrel/ks8851.h @@ -7,6 +7,9 @@ * KS8851 register definitions */ +#ifndef __KS8851_H__ +#define __KS8851_H__ + #define KS_CCR 0x08 #define CCR_LE (1 << 10) /* KSZ8851-16MLL */ #define CCR_EEPROM (1 << 9) @@ -300,3 +303,140 @@ #define TXFR_TXIC (1 << 15) #define TXFR_TXFID_MASK (0x3f << 0) #define TXFR_TXFID_SHIFT (0) + +/** + * struct ks8851_rxctrl - KS8851 driver rx control + * @mchash: Multicast hash-table data. + * @rxcr1: KS_RXCR1 register setting + * @rxcr2: KS_RXCR2 register setting + * + * Representation of the settings needs to control the receive filtering + * such as the multicast hash-filter and the receive register settings. This + * is used to make the job of working out if the receive settings change and + * then issuing the new settings to the worker that will send the necessary + * commands. + */ +struct ks8851_rxctrl { + u16 mchash[4]; + u16 rxcr1; + u16 rxcr2; +}; + +/** + * union ks8851_tx_hdr - tx header data + * @txb: The header as bytes + * @txw: The header as 16bit, little-endian words + * + * A dual representation of the tx header data to allow + * access to individual bytes, and to allow 16bit accesses + * with 16bit alignment. + */ +union ks8851_tx_hdr { + u8 txb[6]; + __le16 txw[3]; +}; + +/** + * struct ks8851_net - KS8851 driver private data + * @netdev: The network device we're bound to + * @statelock: Lock on this structure for tx list. + * @mii: The MII state information for the mii calls. + * @rxctrl: RX settings for @rxctrl_work. + * @rxctrl_work: Work queue for updating RX mode and multicast lists + * @txq: Queue of packets for transmission. + * @txh: Space for generating packet TX header in DMA-able data + * @rxd: Space for receiving SPI data, in DMA-able space. + * @txd: Space for transmitting SPI data, in DMA-able space. + * @msg_enable: The message flags controlling driver output (see ethtool). + * @fid: Incrementing frame id tag. + * @rc_ier: Cached copy of KS_IER. + * @rc_ccr: Cached copy of KS_CCR. + * @rc_rxqcr: Cached copy of KS_RXQCR. + * @eeprom: 93CX6 EEPROM state for accessing on-board EEPROM. + * @vdd_reg: Optional regulator supplying the chip + * @vdd_io: Optional digital power supply for IO + * @gpio: Optional reset_n gpio + * + * The @statelock is used to protect information in the structure which may + * need to be accessed via several sources, such as the network driver layer + * or one of the work queues. + * + * We align the buffers we may use for rx/tx to ensure that if the SPI driver + * wants to DMA map them, it will not have any problems with data the driver + * modifies. + */ +struct ks8851_net { + struct net_device *netdev; + spinlock_t statelock; + + union ks8851_tx_hdr txh ____cacheline_aligned; + u8 rxd[8]; + u8 txd[8]; + + u32 msg_enable ____cacheline_aligned; + u16 tx_space; + u8 fid; + + u16 rc_ier; + u16 rc_rxqcr; + u16 rc_ccr; + + struct mii_if_info mii; + struct ks8851_rxctrl rxctrl; + + struct work_struct rxctrl_work; + + struct sk_buff_head txq; + + struct eeprom_93cx6 eeprom; + struct regulator *vdd_reg; + struct regulator *vdd_io; + int gpio; + + unsigned int (*rdreg16)(struct ks8851_net *ks, + unsigned int reg); + void (*wrreg16)(struct ks8851_net *ks, + unsigned int reg, unsigned int val); + void (*rdfifo)(struct ks8851_net *ks, u8 *buff, + unsigned int len); + void (*wrfifo)(struct ks8851_net *ks, + struct sk_buff *txp, bool irq); +}; + +int ks8851_probe_common(struct net_device *netdev, struct device *dev); +int ks8851_remove_common(struct device *dev); +int ks8851_suspend(struct device *dev); +int ks8851_resume(struct device *dev); + +void ks8851_lock(struct ks8851_net *ks, unsigned long *flags); +void ks8851_unlock(struct ks8851_net *ks, unsigned long *flags); + +unsigned int ks8851_rdreg16(struct ks8851_net *ks, unsigned int reg); +void ks8851_wrreg16(struct ks8851_net *ks, unsigned int reg, unsigned int val); +void ks8851_rdfifo(struct ks8851_net *ks, u8 *buff, unsigned int len); +void ks8851_wrfifo(struct ks8851_net *ks, struct sk_buff *txp, bool irq); + +void ks8851_rx_skb(struct sk_buff *skb); +void ks8851_flush_tx_work(struct ks8851_net *ks); + +netdev_tx_t ks8851_start_xmit(struct sk_buff *skb, struct net_device *dev); + +static SIMPLE_DEV_PM_OPS(ks8851_pm_ops, ks8851_suspend, ks8851_resume); + +/** + * ks8851_done_tx - update and then free skbuff after transmitting + * @ks: The device state + * @txb: The buffer transmitted + */ +static void __maybe_unused ks8851_done_tx(struct ks8851_net *ks, + struct sk_buff *txb) +{ + struct net_device *dev = ks->netdev; + + dev->stats.tx_bytes += txb->len; + dev->stats.tx_packets++; + + dev_kfree_skb(txb); +} + +#endif diff --git a/drivers/net/ethernet/micrel/ks8851.c b/drivers/net/ethernet/micrel/ks8851_common.c similarity index 66% rename from drivers/net/ethernet/micrel/ks8851.c rename to drivers/net/ethernet/micrel/ks8851_common.c index d29b52ffbb49..b708c01f9f33 100644 --- a/drivers/net/ethernet/micrel/ks8851.c +++ b/drivers/net/ethernet/micrel/ks8851_common.c @@ -22,274 +22,14 @@ #include #include -#include #include #include #include #include "ks8851.h" -/** - * struct ks8851_rxctrl - KS8851 driver rx control - * @mchash: Multicast hash-table data. - * @rxcr1: KS_RXCR1 register setting - * @rxcr2: KS_RXCR2 register setting - * - * Representation of the settings needs to control the receive filtering - * such as the multicast hash-filter and the receive register settings. This - * is used to make the job of working out if the receive settings change and - * then issuing the new settings to the worker that will send the necessary - * commands. - */ -struct ks8851_rxctrl { - u16 mchash[4]; - u16 rxcr1; - u16 rxcr2; -}; - -/** - * union ks8851_tx_hdr - tx header data - * @txb: The header as bytes - * @txw: The header as 16bit, little-endian words - * - * A dual representation of the tx header data to allow - * access to individual bytes, and to allow 16bit accesses - * with 16bit alignment. - */ -union ks8851_tx_hdr { - u8 txb[6]; - __le16 txw[3]; -}; - -/** - * struct ks8851_net - KS8851 driver private data - * @netdev: The network device we're bound to - * @statelock: Lock on this structure for tx list. - * @mii: The MII state information for the mii calls. - * @rxctrl: RX settings for @rxctrl_work. - * @rxctrl_work: Work queue for updating RX mode and multicast lists - * @txq: Queue of packets for transmission. - * @txh: Space for generating packet TX header in DMA-able data - * @rxd: Space for receiving SPI data, in DMA-able space. - * @txd: Space for transmitting SPI data, in DMA-able space. - * @msg_enable: The message flags controlling driver output (see ethtool). - * @fid: Incrementing frame id tag. - * @rc_ier: Cached copy of KS_IER. - * @rc_ccr: Cached copy of KS_CCR. - * @rc_rxqcr: Cached copy of KS_RXQCR. - * @eeprom: 93CX6 EEPROM state for accessing on-board EEPROM. - * @vdd_reg: Optional regulator supplying the chip - * @vdd_io: Optional digital power supply for IO - * @gpio: Optional reset_n gpio - * - * The @statelock is used to protect information in the structure which may - * need to be accessed via several sources, such as the network driver layer - * or one of the work queues. - * - * We align the buffers we may use for rx/tx to ensure that if the SPI driver - * wants to DMA map them, it will not have any problems with data the driver - * modifies. - */ -struct ks8851_net { - struct net_device *netdev; - spinlock_t statelock; - - union ks8851_tx_hdr txh ____cacheline_aligned; - u8 rxd[8]; - u8 txd[8]; - - u32 msg_enable ____cacheline_aligned; - u16 tx_space; - u8 fid; - - u16 rc_ier; - u16 rc_rxqcr; - u16 rc_ccr; - - struct mii_if_info mii; - struct ks8851_rxctrl rxctrl; - - struct work_struct rxctrl_work; - - struct sk_buff_head txq; - - struct eeprom_93cx6 eeprom; - struct regulator *vdd_reg; - struct regulator *vdd_io; - int gpio; -}; - -/** - * struct ks8851_net_spi - KS8851 SPI driver private data - * @ks8851: KS8851 driver common private data - * @lock: Lock to ensure that the device is not accessed when busy. - * @tx_work: Work queue for tx packets - * @spidev: The spi device we're bound to. - * @spi_msg1: pre-setup SPI transfer with one message, @spi_xfer1. - * @spi_msg2: pre-setup SPI transfer with two messages, @spi_xfer2. - * - * The @lock ensures that the chip is protected when certain operations are - * in progress. When the read or write packet transfer is in progress, most - * of the chip registers are not ccessible until the transfer is finished and - * the DMA has been de-asserted. - */ -struct ks8851_net_spi { - struct ks8851_net ks8851; - struct mutex lock; - struct work_struct tx_work; - struct spi_device *spidev; - struct spi_message spi_msg1; - struct spi_message spi_msg2; - struct spi_transfer spi_xfer1; - struct spi_transfer spi_xfer2[2]; -}; - -#define to_ks8851_spi(ks) container_of((ks), struct ks8851_net_spi, ks8851) - static int msg_enable; -/* SPI frame opcodes */ -#define KS_SPIOP_RD (0x00) -#define KS_SPIOP_WR (0x40) -#define KS_SPIOP_RXFIFO (0x80) -#define KS_SPIOP_TXFIFO (0xC0) - -/* shift for byte-enable data */ -#define BYTE_EN(_x) ((_x) << 2) - -/* turn register number and byte-enable mask into data for start of packet */ -#define MK_OP(_byteen, _reg) (BYTE_EN(_byteen) | (_reg) << (8+2) | (_reg) >> 6) - -/** - * ks8851_lock - register access lock - * @ks: The chip state - * @flags: Spinlock flags - * - * Claim chip register access lock - */ -static void ks8851_lock(struct ks8851_net *ks, unsigned long *flags) -{ - struct ks8851_net_spi *kss = to_ks8851_spi(ks); - - mutex_lock(&kss->lock); -} - -/** - * ks8851_unlock - register access unlock - * @ks: The chip state - * @flags: Spinlock flags - * - * Release chip register access lock - */ -static void ks8851_unlock(struct ks8851_net *ks, unsigned long *flags) -{ - struct ks8851_net_spi *kss = to_ks8851_spi(ks); - - mutex_unlock(&kss->lock); -} - -/* SPI register read/write calls. - * - * All these calls issue SPI transactions to access the chip's registers. They - * all require that the necessary lock is held to prevent accesses when the - * chip is busy transferring packet data (RX/TX FIFO accesses). - */ - -/** - * ks8851_wrreg16 - write 16bit register value to chip - * @ks: The chip state - * @reg: The register address - * @val: The value to write - * - * Issue a write to put the value @val into the register specified in @reg. - */ -static void ks8851_wrreg16(struct ks8851_net *ks, unsigned reg, unsigned val) -{ - struct ks8851_net_spi *kss = to_ks8851_spi(ks); - struct spi_transfer *xfer = &kss->spi_xfer1; - struct spi_message *msg = &kss->spi_msg1; - __le16 txb[2]; - int ret; - - txb[0] = cpu_to_le16(MK_OP(reg & 2 ? 0xC : 0x03, reg) | KS_SPIOP_WR); - txb[1] = cpu_to_le16(val); - - xfer->tx_buf = txb; - xfer->rx_buf = NULL; - xfer->len = 4; - - ret = spi_sync(kss->spidev, msg); - if (ret < 0) - netdev_err(ks->netdev, "spi_sync() failed\n"); -} - -/** - * ks8851_rdreg - issue read register command and return the data - * @ks: The device state - * @op: The register address and byte enables in message format. - * @rxb: The RX buffer to return the result into - * @rxl: The length of data expected. - * - * This is the low level read call that issues the necessary spi message(s) - * to read data from the register specified in @op. - */ -static void ks8851_rdreg(struct ks8851_net *ks, unsigned op, - u8 *rxb, unsigned rxl) -{ - struct ks8851_net_spi *kss = to_ks8851_spi(ks); - struct spi_transfer *xfer; - struct spi_message *msg; - __le16 *txb = (__le16 *)ks->txd; - u8 *trx = ks->rxd; - int ret; - - txb[0] = cpu_to_le16(op | KS_SPIOP_RD); - - if (kss->spidev->master->flags & SPI_MASTER_HALF_DUPLEX) { - msg = &kss->spi_msg2; - xfer = kss->spi_xfer2; - - xfer->tx_buf = txb; - xfer->rx_buf = NULL; - xfer->len = 2; - - xfer++; - xfer->tx_buf = NULL; - xfer->rx_buf = trx; - xfer->len = rxl; - } else { - msg = &kss->spi_msg1; - xfer = &kss->spi_xfer1; - - xfer->tx_buf = txb; - xfer->rx_buf = trx; - xfer->len = rxl + 2; - } - - ret = spi_sync(kss->spidev, msg); - if (ret < 0) - netdev_err(ks->netdev, "read: spi_sync() failed\n"); - else if (kss->spidev->master->flags & SPI_MASTER_HALF_DUPLEX) - memcpy(rxb, trx, rxl); - else - memcpy(rxb, trx + 2, rxl); -} - -/** - * ks8851_rdreg16 - read 16 bit register from device - * @ks: The chip information - * @reg: The register address - * - * Read a 16bit register from the chip, returning the result -*/ -static unsigned ks8851_rdreg16(struct ks8851_net *ks, unsigned reg) -{ - __le16 rx = 0; - - ks8851_rdreg(ks, MK_OP(reg & 2 ? 0xC : 0x3, reg), (u8 *)&rx, 2); - return le16_to_cpu(rx); -} - /** * ks8851_soft_reset - issue one of the soft reset to the device * @ks: The device state. @@ -428,43 +168,6 @@ static void ks8851_init_mac(struct ks8851_net *ks, struct device_node *np) ks8851_write_mac_addr(dev); } -/** - * ks8851_rdfifo - read data from the receive fifo - * @ks: The device state. - * @buff: The buffer address - * @len: The length of the data to read - * - * Issue an RXQ FIFO read command and read the @len amount of data from - * the FIFO into the buffer specified by @buff. - */ -static void ks8851_rdfifo(struct ks8851_net *ks, u8 *buff, unsigned len) -{ - struct ks8851_net_spi *kss = to_ks8851_spi(ks); - struct spi_transfer *xfer = kss->spi_xfer2; - struct spi_message *msg = &kss->spi_msg2; - u8 txb[1]; - int ret; - - netif_dbg(ks, rx_status, ks->netdev, - "%s: %d@%p\n", __func__, len, buff); - - /* set the operation we're issuing */ - txb[0] = KS_SPIOP_RXFIFO; - - xfer->tx_buf = txb; - xfer->rx_buf = NULL; - xfer->len = 1; - - xfer++; - xfer->rx_buf = buff; - xfer->tx_buf = NULL; - xfer->len = len; - - ret = spi_sync(kss->spidev, msg); - if (ret < 0) - netdev_err(ks->netdev, "%s: spi_sync() failed\n", __func__); -} - /** * ks8851_dbg_dumpkkt - dump initial packet contents to debug * @ks: The device state @@ -481,15 +184,6 @@ static void ks8851_dbg_dumpkkt(struct ks8851_net *ks, u8 *rxpkt) rxpkt[12], rxpkt[13], rxpkt[14], rxpkt[15]); } -/** - * ks8851_rx_skb - receive skbuff - * @skb: The skbuff - */ -static void ks8851_rx_skb(struct sk_buff *skb) -{ - netif_rx_ni(skb); -} - /** * ks8851_rx_pkts - receive packets from the host * @ks: The device information. @@ -681,117 +375,6 @@ static inline unsigned calc_txlen(unsigned len) return ALIGN(len + 4, 4); } -/** - * ks8851_wrpkt - write packet to TX FIFO - * @ks: The device state. - * @txp: The sk_buff to transmit. - * @irq: IRQ on completion of the packet. - * - * Send the @txp to the chip. This means creating the relevant packet header - * specifying the length of the packet and the other information the chip - * needs, such as IRQ on completion. Send the header and the packet data to - * the device. - */ -static void ks8851_wrpkt(struct ks8851_net *ks, struct sk_buff *txp, bool irq) -{ - struct ks8851_net_spi *kss = to_ks8851_spi(ks); - struct spi_transfer *xfer = kss->spi_xfer2; - struct spi_message *msg = &kss->spi_msg2; - unsigned fid = 0; - int ret; - - netif_dbg(ks, tx_queued, ks->netdev, "%s: skb %p, %d@%p, irq %d\n", - __func__, txp, txp->len, txp->data, irq); - - fid = ks->fid++; - fid &= TXFR_TXFID_MASK; - - if (irq) - fid |= TXFR_TXIC; /* irq on completion */ - - /* start header at txb[1] to align txw entries */ - ks->txh.txb[1] = KS_SPIOP_TXFIFO; - ks->txh.txw[1] = cpu_to_le16(fid); - ks->txh.txw[2] = cpu_to_le16(txp->len); - - xfer->tx_buf = &ks->txh.txb[1]; - xfer->rx_buf = NULL; - xfer->len = 5; - - xfer++; - xfer->tx_buf = txp->data; - xfer->rx_buf = NULL; - xfer->len = ALIGN(txp->len, 4); - - ret = spi_sync(kss->spidev, msg); - if (ret < 0) - netdev_err(ks->netdev, "%s: spi_sync() failed\n", __func__); -} - -/** - * ks8851_done_tx - update and then free skbuff after transmitting - * @ks: The device state - * @txb: The buffer transmitted - */ -static void ks8851_done_tx(struct ks8851_net *ks, struct sk_buff *txb) -{ - struct net_device *dev = ks->netdev; - - dev->stats.tx_bytes += txb->len; - dev->stats.tx_packets++; - - dev_kfree_skb(txb); -} - -/** - * ks8851_tx_work - process tx packet(s) - * @work: The work strucutre what was scheduled. - * - * This is called when a number of packets have been scheduled for - * transmission and need to be sent to the device. - */ -static void ks8851_tx_work(struct work_struct *work) -{ - struct ks8851_net_spi *kss; - struct ks8851_net *ks; - unsigned long flags; - struct sk_buff *txb; - bool last; - - kss = container_of(work, struct ks8851_net_spi, tx_work); - ks = &kss->ks8851; - last = skb_queue_empty(&ks->txq); - - ks8851_lock(ks, &flags); - - while (!last) { - txb = skb_dequeue(&ks->txq); - last = skb_queue_empty(&ks->txq); - - if (txb != NULL) { - ks8851_wrreg16(ks, KS_RXQCR, ks->rc_rxqcr | RXQCR_SDA); - ks8851_wrpkt(ks, txb, last); - ks8851_wrreg16(ks, KS_RXQCR, ks->rc_rxqcr); - ks8851_wrreg16(ks, KS_TXQCR, TXQCR_METFE); - - ks8851_done_tx(ks, txb); - } - } - - ks8851_unlock(ks, &flags); -} - -/** - * ks8851_flush_tx_work - flush outstanding TX work - * @ks: The device state - */ -static void ks8851_flush_tx_work(struct ks8851_net *ks) -{ - struct ks8851_net_spi *kss = to_ks8851_spi(ks); - - flush_work(&kss->tx_work); -} - /** * ks8851_net_open - open network device * @dev: The network device being opened. @@ -924,48 +507,6 @@ static int ks8851_net_stop(struct net_device *dev) return 0; } -/** - * ks8851_start_xmit - transmit packet - * @skb: The buffer to transmit - * @dev: The device used to transmit the packet. - * - * Called by the network layer to transmit the @skb. Queue the packet for - * the device and schedule the necessary work to transmit the packet when - * it is free. - * - * We do this to firstly avoid sleeping with the network device locked, - * and secondly so we can round up more than one packet to transmit which - * means we can try and avoid generating too many transmit done interrupts. - */ -static netdev_tx_t ks8851_start_xmit(struct sk_buff *skb, - struct net_device *dev) -{ - struct ks8851_net *ks = netdev_priv(dev); - unsigned needed = calc_txlen(skb->len); - netdev_tx_t ret = NETDEV_TX_OK; - struct ks8851_net_spi *kss; - - kss = to_ks8851_spi(ks); - - netif_dbg(ks, tx_queued, ks->netdev, - "%s: skb %p, %d@%p\n", __func__, skb, skb->len, skb->data); - - spin_lock(&ks->statelock); - - if (needed > ks->tx_space) { - netif_stop_queue(dev); - ret = NETDEV_TX_BUSY; - } else { - ks->tx_space -= needed; - skb_queue_tail(&ks->txq, skb); - } - - spin_unlock(&ks->statelock); - schedule_work(&kss->tx_work); - - return ret; -} - /** * ks8851_rxctrl_work - work handler to change rx mode * @work: The work structure this belongs to. @@ -1401,7 +942,7 @@ static int ks8851_read_selftest(struct ks8851_net *ks) #ifdef CONFIG_PM_SLEEP -static int ks8851_suspend(struct device *dev) +int ks8851_suspend(struct device *dev) { struct ks8851_net *ks = dev_get_drvdata(dev); struct net_device *netdev = ks->netdev; @@ -1414,7 +955,7 @@ static int ks8851_suspend(struct device *dev) return 0; } -static int ks8851_resume(struct device *dev) +int ks8851_resume(struct device *dev) { struct ks8851_net *ks = dev_get_drvdata(dev); struct net_device *netdev = ks->netdev; @@ -1428,9 +969,7 @@ static int ks8851_resume(struct device *dev) } #endif -static SIMPLE_DEV_PM_OPS(ks8851_pm_ops, ks8851_suspend, ks8851_resume); - -static int ks8851_probe_common(struct net_device *netdev, struct device *dev) +int ks8851_probe_common(struct net_device *netdev, struct device *dev) { struct ks8851_net *ks = netdev_priv(netdev); unsigned cider; @@ -1559,7 +1098,7 @@ static int ks8851_probe_common(struct net_device *netdev, struct device *dev) return ret; } -static int ks8851_remove_common(struct device *dev) +int ks8851_remove_common(struct device *dev) { struct ks8851_net *priv = dev_get_drvdata(dev); @@ -1575,74 +1114,6 @@ static int ks8851_remove_common(struct device *dev) return 0; } -static int ks8851_probe(struct spi_device *spi) -{ - struct device *dev = &spi->dev; - struct ks8851_net_spi *kss; - struct net_device *netdev; - struct ks8851_net *ks; - - netdev = devm_alloc_etherdev(dev, sizeof(struct ks8851_net_spi)); - if (!netdev) - return -ENOMEM; - - spi->bits_per_word = 8; - - ks = netdev_priv(netdev); - -#define STD_IRQ (IRQ_LCI | /* Link Change */ \ - IRQ_TXI | /* TX done */ \ - IRQ_RXI | /* RX done */ \ - IRQ_SPIBEI | /* SPI bus error */ \ - IRQ_TXPSI | /* TX process stop */ \ - IRQ_RXPSI) /* RX process stop */ - ks->rc_ier = STD_IRQ; - - kss = to_ks8851_spi(ks); - - kss->spidev = spi; - mutex_init(&kss->lock); - INIT_WORK(&kss->tx_work, ks8851_tx_work); - - /* initialise pre-made spi transfer messages */ - spi_message_init(&kss->spi_msg1); - spi_message_add_tail(&kss->spi_xfer1, &kss->spi_msg1); - - spi_message_init(&kss->spi_msg2); - spi_message_add_tail(&kss->spi_xfer2[0], &kss->spi_msg2); - spi_message_add_tail(&kss->spi_xfer2[1], &kss->spi_msg2); - - netdev->irq = spi->irq; - - return ks8851_probe_common(netdev, dev); -} - -static int ks8851_remove(struct spi_device *spi) -{ - return ks8851_remove_common(&spi->dev); -} - -static const struct of_device_id ks8851_match_table[] = { - { .compatible = "micrel,ks8851" }, - { } -}; -MODULE_DEVICE_TABLE(of, ks8851_match_table); - -static struct spi_driver ks8851_driver = { - .driver = { - .name = "ks8851", - .of_match_table = ks8851_match_table, - .pm = &ks8851_pm_ops, - }, - .probe = ks8851_probe, - .remove = ks8851_remove, -}; -module_spi_driver(ks8851_driver); - -MODULE_DESCRIPTION("KS8851 Network driver"); -MODULE_AUTHOR("Ben Dooks "); -MODULE_LICENSE("GPL"); - module_param_named(message, msg_enable, int, 0); MODULE_PARM_DESC(message, "Message verbosity level (0=none, 31=all)"); MODULE_ALIAS("spi:ks8851"); diff --git a/drivers/net/ethernet/micrel/ks8851_spi.c b/drivers/net/ethernet/micrel/ks8851_spi.c new file mode 100644 index 000000000000..e245ad0b82f4 --- /dev/null +++ b/drivers/net/ethernet/micrel/ks8851_spi.c @@ -0,0 +1,448 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* drivers/net/ethernet/micrel/ks8851.c + * + * Copyright 2009 Simtec Electronics + * http://www.simtec.co.uk/ + * Ben Dooks + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#define DEBUG + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +#include "ks8851.h" + +/** + * struct ks8851_net_spi - KS8851 SPI driver private data + * @lock: Lock to ensure that the device is not accessed when busy. + * @tx_work: Work queue for tx packets + * @ks8851: KS8851 driver common private data + * @spidev: The spi device we're bound to. + * @spi_msg1: pre-setup SPI transfer with one message, @spi_xfer1. + * @spi_msg2: pre-setup SPI transfer with two messages, @spi_xfer2. + * + * The @lock ensures that the chip is protected when certain operations are + * in progress. When the read or write packet transfer is in progress, most + * of the chip registers are not ccessible until the transfer is finished and + * the DMA has been de-asserted. + */ +struct ks8851_net_spi { + struct ks8851_net ks8851; + struct mutex lock; + struct work_struct tx_work; + struct spi_device *spidev; + struct spi_message spi_msg1; + struct spi_message spi_msg2; + struct spi_transfer spi_xfer1; + struct spi_transfer spi_xfer2[2]; +}; + +#define to_ks8851_spi(ks) container_of((ks), struct ks8851_net_spi, ks8851) + +/* SPI frame opcodes */ +#define KS_SPIOP_RD 0x00 +#define KS_SPIOP_WR 0x40 +#define KS_SPIOP_RXFIFO 0x80 +#define KS_SPIOP_TXFIFO 0xC0 + +/* shift for byte-enable data */ +#define BYTE_EN(_x) ((_x) << 2) + +/* turn register number and byte-enable mask into data for start of packet */ +#define MK_OP(_byteen, _reg) \ + (BYTE_EN(_byteen) | (_reg) << (8 + 2) | (_reg) >> 6) + +/** + * ks8851_lock - register access lock + * @ks: The chip state + * @flags: Spinlock flags + * + * Claim chip register access lock + */ +void ks8851_lock(struct ks8851_net *ks, unsigned long *flags) +{ + struct ks8851_net_spi *kss = to_ks8851_spi(ks); + + mutex_lock(&kss->lock); +} + +/** + * ks8851_unlock - register access unlock + * @ks: The chip state + * @flags: Spinlock flags + * + * Release chip register access lock + */ +void ks8851_unlock(struct ks8851_net *ks, unsigned long *flags) +{ + struct ks8851_net_spi *kss = to_ks8851_spi(ks); + + mutex_unlock(&kss->lock); +} + +/* SPI register read/write calls. + * + * All these calls issue SPI transactions to access the chip's registers. They + * all require that the necessary lock is held to prevent accesses when the + * chip is busy transferring packet data (RX/TX FIFO accesses). + */ + +/** + * ks8851_wrreg16 - write 16bit register value to chip via SPI + * @ks: The chip state + * @reg: The register address + * @val: The value to write + * + * Issue a write to put the value @val into the register specified in @reg. + */ +void ks8851_wrreg16(struct ks8851_net *ks, unsigned int reg, unsigned int val) +{ + struct ks8851_net_spi *kss = to_ks8851_spi(ks); + struct spi_transfer *xfer = &kss->spi_xfer1; + struct spi_message *msg = &kss->spi_msg1; + __le16 txb[2]; + int ret; + + txb[0] = cpu_to_le16(MK_OP(reg & 2 ? 0xC : 0x03, reg) | KS_SPIOP_WR); + txb[1] = cpu_to_le16(val); + + xfer->tx_buf = txb; + xfer->rx_buf = NULL; + xfer->len = 4; + + ret = spi_sync(kss->spidev, msg); + if (ret < 0) + netdev_err(ks->netdev, "spi_sync() failed\n"); +} + +/** + * ks8851_rdreg - issue read register command and return the data + * @ks: The device state + * @op: The register address and byte enables in message format. + * @rxb: The RX buffer to return the result into + * @rxl: The length of data expected. + * + * This is the low level read call that issues the necessary spi message(s) + * to read data from the register specified in @op. + */ +static void ks8851_rdreg(struct ks8851_net *ks, unsigned int op, + u8 *rxb, unsigned int rxl) +{ + struct ks8851_net_spi *kss = to_ks8851_spi(ks); + struct spi_transfer *xfer; + struct spi_message *msg; + __le16 *txb = (__le16 *)ks->txd; + u8 *trx = ks->rxd; + int ret; + + txb[0] = cpu_to_le16(op | KS_SPIOP_RD); + + if (kss->spidev->master->flags & SPI_MASTER_HALF_DUPLEX) { + msg = &kss->spi_msg2; + xfer = kss->spi_xfer2; + + xfer->tx_buf = txb; + xfer->rx_buf = NULL; + xfer->len = 2; + + xfer++; + xfer->tx_buf = NULL; + xfer->rx_buf = trx; + xfer->len = rxl; + } else { + msg = &kss->spi_msg1; + xfer = &kss->spi_xfer1; + + xfer->tx_buf = txb; + xfer->rx_buf = trx; + xfer->len = rxl + 2; + } + + ret = spi_sync(kss->spidev, msg); + if (ret < 0) + netdev_err(ks->netdev, "read: spi_sync() failed\n"); + else if (kss->spidev->master->flags & SPI_MASTER_HALF_DUPLEX) + memcpy(rxb, trx, rxl); + else + memcpy(rxb, trx + 2, rxl); +} + +/** + * ks8851_rdreg16 - read 16 bit register from device via SPI + * @ks: The chip information + * @reg: The register address + * + * Read a 16bit register from the chip, returning the result + */ +unsigned int ks8851_rdreg16(struct ks8851_net *ks, unsigned int reg) +{ + __le16 rx = 0; + + ks8851_rdreg(ks, MK_OP(reg & 2 ? 0xC : 0x3, reg), (u8 *)&rx, 2); + return le16_to_cpu(rx); +} + +/** + * ks8851_rdfifo - read data from the receive fifo via SPI + * @ks: The device state. + * @buff: The buffer address + * @len: The length of the data to read + * + * Issue an RXQ FIFO read command and read the @len amount of data from + * the FIFO into the buffer specified by @buff. + */ +void ks8851_rdfifo(struct ks8851_net *ks, u8 *buff, unsigned int len) +{ + struct ks8851_net_spi *kss = to_ks8851_spi(ks); + struct spi_transfer *xfer = kss->spi_xfer2; + struct spi_message *msg = &kss->spi_msg2; + u8 txb[1]; + int ret; + + netif_dbg(ks, rx_status, ks->netdev, + "%s: %d@%p\n", __func__, len, buff); + + /* set the operation we're issuing */ + txb[0] = KS_SPIOP_RXFIFO; + + xfer->tx_buf = txb; + xfer->rx_buf = NULL; + xfer->len = 1; + + xfer++; + xfer->rx_buf = buff; + xfer->tx_buf = NULL; + xfer->len = len; + + ret = spi_sync(kss->spidev, msg); + if (ret < 0) + netdev_err(ks->netdev, "%s: spi_sync() failed\n", __func__); +} + +/** + * ks8851_wrfifo - write packet to TX FIFO via SPI + * @ks: The device state. + * @txp: The sk_buff to transmit. + * @irq: IRQ on completion of the packet. + * + * Send the @txp to the chip. This means creating the relevant packet header + * specifying the length of the packet and the other information the chip + * needs, such as IRQ on completion. Send the header and the packet data to + * the device. + */ +void ks8851_wrfifo(struct ks8851_net *ks, struct sk_buff *txp, bool irq) +{ + struct ks8851_net_spi *kss = to_ks8851_spi(ks); + struct spi_transfer *xfer = kss->spi_xfer2; + struct spi_message *msg = &kss->spi_msg2; + unsigned int fid = 0; + int ret; + + netif_dbg(ks, tx_queued, ks->netdev, "%s: skb %p, %d@%p, irq %d\n", + __func__, txp, txp->len, txp->data, irq); + + fid = ks->fid++; + fid &= TXFR_TXFID_MASK; + + if (irq) + fid |= TXFR_TXIC; /* irq on completion */ + + /* start header at txb[1] to align txw entries */ + ks->txh.txb[1] = KS_SPIOP_TXFIFO; + ks->txh.txw[1] = cpu_to_le16(fid); + ks->txh.txw[2] = cpu_to_le16(txp->len); + + xfer->tx_buf = &ks->txh.txb[1]; + xfer->rx_buf = NULL; + xfer->len = 5; + + xfer++; + xfer->tx_buf = txp->data; + xfer->rx_buf = NULL; + xfer->len = ALIGN(txp->len, 4); + + ret = spi_sync(kss->spidev, msg); + if (ret < 0) + netdev_err(ks->netdev, "%s: spi_sync() failed\n", __func__); +} + +/** + * ks8851_rx_skb - receive skbuff + * @skb: The skbuff + */ +void ks8851_rx_skb(struct sk_buff *skb) +{ + netif_rx_ni(skb); +} + +/** + * ks8851_tx_work - process tx packet(s) + * @work: The work strucutre what was scheduled. + * + * This is called when a number of packets have been scheduled for + * transmission and need to be sent to the device. + */ +static void ks8851_tx_work(struct work_struct *work) +{ + struct ks8851_net_spi *kss; + struct ks8851_net *ks; + unsigned long flags; + struct sk_buff *txb; + bool last; + + kss = container_of(work, struct ks8851_net_spi, tx_work); + ks = &kss->ks8851; + last = skb_queue_empty(&ks->txq); + + ks8851_lock(ks, &flags); + + while (!last) { + txb = skb_dequeue(&ks->txq); + last = skb_queue_empty(&ks->txq); + + if (txb) { + ks8851_wrreg16(ks, KS_RXQCR, ks->rc_rxqcr | RXQCR_SDA); + ks8851_wrfifo(ks, txb, last); + ks8851_wrreg16(ks, KS_RXQCR, ks->rc_rxqcr); + ks8851_wrreg16(ks, KS_TXQCR, TXQCR_METFE); + + ks8851_done_tx(ks, txb); + } + } + + ks8851_unlock(ks, &flags); +} + +/** + * ks8851_flush_tx_work - flush outstanding TX work + * @ks: The device state + */ +void ks8851_flush_tx_work(struct ks8851_net *ks) +{ + struct ks8851_net_spi *kss = to_ks8851_spi(ks); + + flush_work(&kss->tx_work); +} + +/** + * ks8851_start_xmit - transmit packet + * @skb: The buffer to transmit + * @dev: The device used to transmit the packet. + * + * Called by the network layer to transmit the @skb. Queue the packet for + * the device and schedule the necessary work to transmit the packet when + * it is free. + * + * We do this to firstly avoid sleeping with the network device locked, + * and secondly so we can round up more than one packet to transmit which + * means we can try and avoid generating too many transmit done interrupts. + */ +netdev_tx_t ks8851_start_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct ks8851_net *ks = netdev_priv(dev); + unsigned needed = calc_txlen(skb->len); + netdev_tx_t ret = NETDEV_TX_OK; + + netif_dbg(ks, tx_queued, ks->netdev, + "%s: skb %p, %d@%p\n", __func__, skb, skb->len, skb->data); + + spin_lock(&ks->statelock); + + if (needed > ks->tx_space) { + netif_stop_queue(dev); + ret = NETDEV_TX_BUSY; + } else { + ks->tx_space -= needed; + skb_queue_tail(&ks->txq, skb); + } + + spin_unlock(&ks->statelock); + schedule_work(&ks->tx_work); + + return ret; +} + +static int ks8851_probe_spi(struct spi_device *spi) +{ + struct device *dev = &spi->dev; + struct ks8851_net_spi *kss; + struct net_device *netdev; + struct ks8851_net *ks; + + netdev = devm_alloc_etherdev(dev, sizeof(struct ks8851_net_spi)); + if (!netdev) + return -ENOMEM; + + spi->bits_per_word = 8; + + ks = netdev_priv(netdev); + +#define STD_IRQ (IRQ_LCI | /* Link Change */ \ + IRQ_TXI | /* TX done */ \ + IRQ_RXI | /* RX done */ \ + IRQ_SPIBEI | /* SPI bus error */ \ + IRQ_TXPSI | /* TX process stop */ \ + IRQ_RXPSI) /* RX process stop */ + ks->rc_ier = STD_IRQ; + + kss = to_ks8851_spi(ks); + + kss->spidev = spi; + mutex_init(&kss->lock); + INIT_WORK(&kss->tx_work, ks8851_tx_work); + + /* initialise pre-made spi transfer messages */ + spi_message_init(&kss->spi_msg1); + spi_message_add_tail(&kss->spi_xfer1, &kss->spi_msg1); + + spi_message_init(&kss->spi_msg2); + spi_message_add_tail(&kss->spi_xfer2[0], &kss->spi_msg2); + spi_message_add_tail(&kss->spi_xfer2[1], &kss->spi_msg2); + + netdev->irq = spi->irq; + + return ks8851_probe_common(netdev, dev); +} + +static int ks8851_remove_spi(struct spi_device *spi) +{ + return ks8851_remove_common(&spi->dev); +} + +static const struct of_device_id ks8851_match_table[] = { + { .compatible = "micrel,ks8851" }, + { } +}; +MODULE_DEVICE_TABLE(of, ks8851_match_table); + +static struct spi_driver ks8851_driver = { + .driver = { + .name = "ks8851", + .of_match_table = ks8851_match_table, + .pm = &ks8851_pm_ops, + }, + .probe = ks8851_probe_spi, + .remove = ks8851_remove_spi, +}; +module_spi_driver(ks8851_driver); + +MODULE_DESCRIPTION("KS8851 Network driver"); +MODULE_AUTHOR("Ben Dooks "); +MODULE_LICENSE("GPL");