path: root/drivers/net/ks8842.c

/*
 * ks8842.c timberdale KS8842 ethernet driver
 * Copyright (c) 2009 Intel Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/* Supports:
 * The Micrel KS8842 behind the timberdale FPGA
 * The genuine Micrel KS8841/42 device with ISA 16/32bit bus interface
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mfd/core.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/ks8842.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/scatterlist.h>

#define DRV_NAME "ks8842"

/* Timberdale specific Registers */
#define REG_TIMB_RST		0x1c
#define REG_TIMB_FIFO		0x20
#define REG_TIMB_ISR		0x24
#define REG_TIMB_IER		0x28
#define REG_TIMB_IAR		0x2C
#define REQ_TIMB_DMA_RESUME	0x30

/* KS8842 registers */

#define REG_SELECT_BANK 0x0e

/* bank 0 registers */
#define REG_QRFCR	0x04

/* bank 2 registers */
#define REG_MARL	0x00
#define REG_MARM	0x02
#define REG_MARH	0x04

/* bank 3 registers */
#define REG_GRR		0x06

/* bank 16 registers */
#define REG_TXCR	0x00
#define REG_TXSR	0x02
#define REG_RXCR	0x04
#define REG_TXMIR	0x08
#define REG_RXMIR	0x0A

/* bank 17 registers */
#define REG_TXQCR	0x00
#define REG_RXQCR	0x02
#define REG_TXFDPR	0x04
#define REG_RXFDPR	0x06
#define REG_QMU_DATA_LO 0x08
#define REG_QMU_DATA_HI 0x0A

/* bank 18 registers */
#define REG_IER		0x00
#define IRQ_LINK_CHANGE	0x8000
#define IRQ_TX		0x4000
#define IRQ_RX		0x2000
#define IRQ_RX_OVERRUN	0x0800
#define IRQ_TX_STOPPED	0x0200
#define IRQ_RX_STOPPED	0x0100
#define IRQ_RX_ERROR	0x0080
#define ENABLED_IRQS	(IRQ_LINK_CHANGE | IRQ_TX | IRQ_RX | IRQ_RX_STOPPED | \
		IRQ_TX_STOPPED | IRQ_RX_OVERRUN | IRQ_RX_ERROR)
/* When running via timberdale in DMA mode, the RX interrupt should be
   enabled in the KS8842, but not in the FPGA IP, since the IP handles
   RX DMA internally.
   TX interrupts are not needed it is handled by the FPGA the driver is
   notified via DMA callbacks.
*/
#define ENABLED_IRQS_DMA_IP	(IRQ_LINK_CHANGE | IRQ_RX_STOPPED | \
	IRQ_TX_STOPPED | IRQ_RX_OVERRUN | IRQ_RX_ERROR)
#define ENABLED_IRQS_DMA	(ENABLED_IRQS_DMA_IP | IRQ_RX)
#define REG_ISR		0x02
#define REG_RXSR	0x04
#define RXSR_VALID	0x8000
#define RXSR_BROADCAST	0x80
#define RXSR_MULTICAST	0x40
#define RXSR_UNICAST	0x20
#define RXSR_FRAMETYPE	0x08
#define RXSR_TOO_LONG	0x04
#define RXSR_RUNT	0x02
#define RXSR_CRC_ERROR	0x01
#define RXSR_ERROR	(RXSR_TOO_LONG | RXSR_RUNT | RXSR_CRC_ERROR)

/* bank 32 registers */
#define REG_SW_ID_AND_ENABLE	0x00
#define REG_SGCR1		0x02
#define REG_SGCR2		0x04
#define REG_SGCR3		0x06

/* bank 39 registers */
#define REG_MACAR1		0x00
#define REG_MACAR2		0x02
#define REG_MACAR3		0x04

/* bank 45 registers */
#define REG_P1MBCR		0x00
#define REG_P1MBSR		0x02

/* bank 46 registers */
#define REG_P2MBCR		0x00
#define REG_P2MBSR		0x02

/* bank 48 registers */
#define REG_P1CR2		0x02

/* bank 49 registers */
#define REG_P1CR4		0x02
#define REG_P1SR		0x04

/* flags passed by platform_device for configuration */
#define	MICREL_KS884X		0x01	/* 0=Timeberdale(FPGA), 1=Micrel */
#define	KS884X_16BIT		0x02	/*  1=16bit, 0=32bit */

#define DMA_BUFFER_SIZE		2048

struct ks8842_tx_dma_ctl {
	struct dma_chan *chan;
	struct dma_async_tx_descriptor *adesc;
	void *buf;
	struct scatterlist sg;
	int channel;
};

struct ks8842_rx_dma_ctl {
	struct dma_chan *chan;
	struct dma_async_tx_descriptor *adesc;
	struct sk_buff  *skb;
	struct scatterlist sg;
	struct tasklet_struct tasklet;
	int channel;
};

#define KS8842_USE_DMA(adapter) (((adapter)->dma_tx.channel != -1) && \
	 ((adapter)->dma_rx.channel != -1))

struct ks8842_adapter {
	void __iomem	*hw_addr;
	int		irq;
	unsigned long	conf_flags;	/* copy of platform_device config */
	struct tasklet_struct	tasklet;
	spinlock_t	lock; /* spinlock to be interrupt safe */
	struct work_struct timeout_work;
	struct net_device *netdev;
	struct device *dev;
	struct ks8842_tx_dma_ctl	dma_tx;
	struct ks8842_rx_dma_ctl	dma_rx;
};

static void ks8842_dma_rx_cb(void *data);
static void ks8842_dma_tx_cb(void *data);

static</