saa9730.c

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/*
 * Copyright (C) 2000, 2005  MIPS Technologies, Inc.  All rights reserved.
 *	Authors: Carsten Langgaard <[e-mail]>
 *		 Maciej W. Rozycki <[e-mail]>
 * Copyright (C) 2004 Ralf Baechle <[e-mail]>
 *
 *  This program is free software; you can distribute 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 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.,
 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 * SAA9730 ethernet driver.
 *
 * Changes:
 * Angelo Dell'Aera <[e-mail]> :	Conversion to the new PCI API
 *						(pci_driver).
 *						Conversion to spinlocks.
 *						Error handling fixes.
 */

#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/delay.h>
#include <linux/etherdevice.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/pci.h>
#include <linux/spinlock.h>
#include <linux/types.h>

#include <asm/addrspace.h>
#include <asm/io.h>

#include <asm/mips-boards/prom.h>

#include "saa9730.h"

#ifdef LAN_SAA9730_DEBUG
int lan_saa9730_debug = LAN_SAA9730_DEBUG;
#else
int lan_saa9730_debug;
#endif

#define DRV_MODULE_NAME "saa9730"

static struct pci_device_id saa9730_pci_tbl[] = {
	{ PCI_VENDOR_ID_PHILIPS, PCI_DEVICE_ID_PHILIPS_SAA9730,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ 0, }
};

MODULE_DEVICE_TABLE(pci, saa9730_pci_tbl);

/* Non-zero only if the current card is a PCI with BIOS-set IRQ. */
static unsigned int pci_irq_line;

static void evm_saa9730_enable_lan_int(struct lan_saa9730_private *lp)
{
	writel(readl(&lp->evm_saa9730_regs->InterruptBlock1) | EVM_LAN_INT,
	       &lp->evm_saa9730_regs->InterruptBlock1);
	writel(readl(&lp->evm_saa9730_regs->InterruptStatus1) | EVM_LAN_INT,
	       &lp->evm_saa9730_regs->InterruptStatus1);
	writel(readl(&lp->evm_saa9730_regs->InterruptEnable1) | EVM_LAN_INT |
	       EVM_MASTER_EN, &lp->evm_saa9730_regs->InterruptEnable1);
}

static void evm_saa9730_disable_lan_int(struct lan_saa9730_private *lp)
{
	writel(readl(&lp->evm_saa9730_regs->InterruptBlock1) & ~EVM_LAN_INT,
	       &lp->evm_saa9730_regs->InterruptBlock1);
	writel(readl(&lp->evm_saa9730_regs->InterruptEnable1) & ~EVM_LAN_INT,
	       &lp->evm_saa9730_regs->InterruptEnable1);
}

static void evm_saa9730_clear_lan_int(struct lan_saa9730_private *lp)
{
	writel(EVM_LAN_INT, &lp->evm_saa9730_regs->InterruptStatus1);
}

static void evm_saa9730_block_lan_int(struct lan_saa9730_private *lp)
{
	writel(readl(&lp->evm_saa9730_regs->InterruptBlock1) & ~EVM_LAN_INT,
	       &lp->evm_saa9730_regs->InterruptBlock1);
}

static void evm_saa9730_unblock_lan_int(struct lan_saa9730_private *lp)
{
	writel(readl(&lp->evm_saa9730_regs->InterruptBlock1) | EVM_LAN_INT,
	       &lp->evm_saa9730_regs->InterruptBlock1);
}

static void __used show_saa9730_regs(struct net_device *dev)
{
	struct lan_saa9730_private *lp = netdev_priv(dev);
	int i, j;

	printk("TxmBufferA = %p\n", lp->TxmBuffer[0][0]);
	printk("TxmBufferB = %p\n", lp->TxmBuffer[1][0]);
	printk("RcvBufferA = %p\n", lp->RcvBuffer[0][0]);
	printk("RcvBufferB = %p\n", lp->RcvBuffer[1][0]);

	for (i = 0; i < LAN_SAA9730_BUFFERS; i++) {
		for (j = 0; j < LAN_SAA9730_TXM_Q_SIZE; j++) {
			printk("TxmBuffer[%d][%d] = %x\n", i, j,
			       le32_to_cpu(*(unsigned int *)
					   lp->TxmBuffer[i][j]));
		}
	}
	for (i = 0; i < LAN_SAA9730_BUFFERS; i++) {
		for (j = 0; j < LAN_SAA9730_RCV_Q_SIZE; j++) {
			printk("RcvBuffer[%d][%d] = %x\n", i, j,
			       le32_to_cpu(*(unsigned int *)
					   lp->RcvBuffer[i][j]));
		}
	}
	printk("lp->evm_saa9730_regs->InterruptBlock1 = %x\n",
	       readl(&lp->evm_saa9730_regs->InterruptBlock1));
	printk("lp->evm_saa9730_regs->InterruptStatus1 = %x\n",
	       readl(&lp->evm_saa9730_regs->InterruptStatus1));
	printk("lp->evm_saa9730_regs->InterruptEnable1 = %x\n",
	       readl(&lp->evm_saa9730_regs->InterruptEnable1));
	printk("lp->lan_saa9730_regs->Ok2Use = %x\n",
	       readl(&lp->lan_saa9730_regs->Ok2Use));
	printk("lp->NextTxmBufferIndex = %x\n", lp->NextTxmBufferIndex);
	printk("lp->NextTxmPacketIndex = %x\n", lp->NextTxmPacketIndex);
	printk("lp->PendingTxmBufferIndex = %x\n",
	       lp->PendingTxmBufferIndex);
	printk("lp->PendingTxmPacketIndex = %x\n",
	       lp->PendingTxmPacketIndex);
	printk("lp->lan_saa9730_regs->LanDmaCtl = %x\n",
	       readl(&lp->lan_saa9730_regs->LanDmaCtl));
	printk("lp->lan_saa9730_regs->DmaStatus = %x\n",
	       readl(&lp->lan_saa9730_regs->DmaStatus));
	printk("lp->lan_saa9730_regs->CamCtl = %x\n",
	       readl(&lp->lan_saa9730_regs->CamCtl));
	printk("lp->lan_saa9730_regs->TxCtl = %x\n",
	       readl(&lp->lan_saa9730_regs->TxCtl));
	printk("lp->lan_saa9730_regs->TxStatus = %x\n",
	       readl(&lp->lan_saa9730_regs->TxStatus));
	printk("lp->lan_saa9730_regs->RxCtl = %x\n",
	       readl(&lp->lan_saa9730_regs->RxCtl));
	printk("lp->lan_saa9730_regs->RxStatus = %x\n",
	       readl(&lp->lan_saa9730_regs->RxStatus));

	for (i = 0; i < LAN_SAA9730_CAM_DWORDS; i++) {
		writel(i, &lp->lan_saa9730_regs->CamAddress);
		printk("lp->lan_saa9730_regs->CamData = %x\n",
		       readl(&lp->lan_saa9730_regs->CamData));
	}

	printk("dev->stats.tx_packets = %lx\n", dev->stats.tx_packets);
	printk("dev->stats.tx_errors = %lx\n", dev->stats.tx_errors);
	printk("dev->stats.tx_aborted_errors = %lx\n",
	       dev->stats.tx_aborted_errors);
	printk("dev->stats.tx_window_errors = %lx\n",
	       dev->stats.tx_window_errors);
	printk("dev->stats.tx_carrier_errors = %lx\n",
	       dev->stats.tx_carrier_errors);
	printk("dev->stats.tx_fifo_errors = %lx\n",
	       dev->stats.tx_fifo_errors);
	printk("dev->stats.tx_heartbeat_errors = %lx\n",
	       dev->stats.tx_heartbeat_errors);
	printk("dev->stats.collisions = %lx\n", dev->stats.collisions);

	printk("dev->stats.rx_packets = %lx\n", dev->stats.rx_packets);
	printk("dev->stats.rx_errors = %lx\n", dev->stats.rx_errors);
	printk("dev->stats.rx_dropped = %lx\n", dev->stats.rx_dropped);
	printk("dev->stats.rx_crc_errors = %lx\n", dev->stats.rx_crc_errors);
	printk("dev->stats.rx_frame_errors = %lx\n",
	       dev->stats.rx_frame_errors);
	printk("dev->stats.rx_fifo_errors = %lx\n",
	       dev->stats.rx_fifo_errors);
	printk("dev->stats.rx_length_errors = %lx\n",
	       dev->stats.rx_length_errors);

	printk("lp->lan_saa9730_regs->DebugPCIMasterAddr = %x\n",
	       readl(&lp->lan_saa9730_regs->DebugPCIMasterAddr));
	printk("lp->lan_saa9730_regs->DebugLanTxStateMachine = %x\n",
	       readl(&lp->lan_saa9730_regs->DebugLanTxStateMachine));
	printk("lp->lan_saa9730_regs->DebugLanRxStateMachine = %x\n",
	       readl(&lp->lan_saa9730_regs->DebugLanRxStateMachine));
	printk("lp->lan_saa9730_regs->DebugLanTxFifoPointers = %x\n",
	       readl(&lp->lan_saa9730_regs->DebugLanTxFifoPointers));
	printk("lp->lan_saa9730_regs->DebugLanRxFifoPointers = %x\n",
	       readl(&lp->lan_saa9730_regs->DebugLanRxFifoPointers));
	printk("lp->lan_saa9730_regs->DebugLanCtlStateMachine = %x\n",
	       readl(&lp->lan_saa9730_regs->DebugLanCtlStateMachine));
}

static void lan_saa9730_buffer_init(struct lan_saa9730_private *lp)
{
	int i, j;

	/* Init RX buffers */
	for (i = 0; i < LAN_SAA9730_BUFFERS; i++) {
		for (j = 0; j < LAN_SAA9730_RCV_Q_SIZE; j++) {
			*(unsigned int *) lp->RcvBuffer[i][j] =
			    cpu_to_le32(RXSF_READY <<
					RX_STAT_CTL_OWNER_SHF);
		}
	}

	/* Init TX buffers */
	for (i = 0; i < LAN_SAA9730_BUFFERS; i++) {
		for (j = 0; j < LAN_SAA9730_TXM_Q_SIZE; j++) {
			*(unsigned int *) lp->TxmBuffer[i][j] =
			    cpu_to_le32(TXSF_EMPTY <<
					TX_STAT_CTL_OWNER_SHF);
		}
	}
}

static void lan_saa9730_free_buffers(struct pci_dev *pdev,
				     struct lan_saa9730_private *lp)
{
	pci_free_consistent(pdev, lp->buffer_size, lp->buffer_start,
			    lp->dma_addr);
}

static int lan_saa9730_allocate_buffers(struct pci_dev *pdev,
					struct lan_saa9730_private *lp)
{
	void *Pa;
	unsigned int i, j, rxoffset, txoffset;
	int ret;

	/* Initialize buffer space */
	lp->DmaRcvPackets = LAN_SAA9730_RCV_Q_SIZE;
	lp->DmaTxmPackets = LAN_SAA9730_TXM_Q_SIZE;

	/* Initialize Rx Buffer Index */
	lp->NextRcvPacketIndex = 0;
	lp->NextRcvBufferIndex = 0;

	/* Set current buffer index & next available packet index */
	lp->NextTxmPacketIndex = 0;
	lp->NextTxmBufferIndex = 0;
	lp->PendingTxmPacketIndex = 0;
	lp->PendingTxmBufferIndex = 0;

	/*
	 * Allocate all RX and TX packets in one chunk.
	 * The Rx and Tx packets must be PACKET_SIZE aligned.
	 */
	lp->buffer_size = ((LAN_SAA9730_RCV_Q_SIZE + LAN_SAA9730_TXM_Q_SIZE) *
			   LAN_SAA9730_PACKET_SIZE * LAN_SAA9730_BUFFERS) +
			  LAN_SAA9730_PACKET_SIZE;
	lp->buffer_start = pci_alloc_consistent(pdev, lp->buffer_size,
						&lp->dma_addr);
	if (!lp->buffer_start) {
		ret = -ENOMEM;
		goto out;
	}

	Pa = (void *)ALIGN((unsigned long)lp->buffer_start,
			   LAN_SAA9730_PACKET_SIZE);

	rxoffset = Pa - lp->buffer_start;

	/* Init RX buffers */
	for (i = 0; i < LAN_SAA9730_BUFFERS; i++) {
		for (j = 0; j < LAN_SAA9730_RCV_Q_SIZE; j++) {
			*(unsigned int *) Pa =
			    cpu_to_le32(RXSF_READY <<
					RX_STAT_CTL_OWNER_SHF);
			lp->RcvBuffer[i][j] = Pa;
			Pa += LAN_SAA9730_PACKET_SIZE;
		}
	}

	txoffset = Pa - lp->buffer_start;

	/* Init TX buffers */
	for (i = 0; i < LAN_SAA9730_BUFFERS; i++) {
		for (j = 0; j < LAN_SAA9730_TXM_Q_SIZE; j++) {
			*(unsigned int *) Pa =
			    cpu_to_le32(TXSF_EMPTY <<
					TX_STAT_CTL_OWNER_SHF);
			lp->TxmBuffer[i][j] = Pa;
			Pa += LAN_SAA9730_PACKET_SIZE;
		}
	}

	/*
	 * Set rx buffer A and rx buffer B to point to the first two buffer
	 * spaces.
	 */
	writel(lp->dma_addr + rxoffset, &lp->lan_saa9730_regs->RxBuffA);
	writel(lp->dma_addr + rxoffset +
	       LAN_SAA9730_PACKET_SIZE * LAN_SAA9730_RCV_Q_SIZE,
	       &lp->lan_saa9730_regs->RxBuffB);

	/*
	 * Set txm_buf_a and txm_buf_b to point to the first two buffer
	 * space
	 */
	writel(lp->dma_addr + txoffset,
	       &lp->lan_saa9730_regs->TxBuffA);
	writel(lp->dma_addr + txoffset +
	       LAN_SAA9730_PACKET_SIZE * LAN_SAA9730_TXM_Q_SIZE,
	       &lp->lan_saa9730_regs->TxBuffB);

	/* Set packet number */
	writel((lp->DmaRcvPackets << PK_COUNT_RX_A_SHF) |
	       (lp->DmaRcvPackets << PK_COUNT_RX_B_SHF) |
	       (lp->DmaTxmPackets << PK_COUNT_TX_A_SHF) |
	       (lp->DmaTxmPackets << PK_COUNT_TX_B_SHF),
	       &lp->lan_saa9730_regs->PacketCount);

	return 0;

out:
	return ret;
}

static int lan_saa9730_cam_load(struct lan_saa9730_private *lp)
{
	unsigned int i;
	unsigned char *NetworkAddress;

	NetworkAddress = (unsigned char *) &lp->PhysicalAddress[0][0];

	for (i = 0; i < LAN_SAA9730_CAM_DWORDS; i++) {
		/* First set address to where data is written */
		writel(i, &lp->lan_saa9730_regs->CamAddress);
		writel((NetworkAddress[0] << 24) | (NetworkAddress[1] << 16) |
		       (NetworkAddress[2] << 8) | NetworkAddress[3],
		       &lp->lan_saa9730_regs->CamData);
		NetworkAddress += 4;
	}
	return 0;
}

static int lan_saa9730_cam_init(struct net_device *dev)
{
	struct lan_saa9730_private *lp = netdev_priv(dev);
	unsigned int i;

	/* Copy MAC-address into all entries. */
	for (i = 0; i < LAN_SAA9730_CAM_ENTRIES; i++) {
		memcpy((unsigned char *) lp->PhysicalAddress[i],
		       (unsigned char *) dev->dev_addr, 6);
	}

	return 0;
}

static int lan_saa9730_mii_init(struct lan_saa9730_private *lp)
{
	int i, l;

	/* Check link status, spin here till station is not busy. */
	i = 0;
	while (readl(&lp->lan_saa9730_regs->StationMgmtCtl) & MD_CA_BUSY) {
		i++;
		if (i > 100) {
			printk("Error: lan_saa9730_mii_init: timeout\n");
			return -1;
		}
		mdelay(1);	/* wait 1 ms. */
	}

	/* Now set the control and address register. */
	writel(MD_CA_BUSY | PHY_STATUS | PHY_ADDRESS << MD_CA_PHY_SHF,
	       &lp->lan_saa9730_regs->StationMgmtCtl);

	/* check link status, spin here till station is not busy */
	i = 0;
	while (readl(&lp->lan_saa9730_regs->StationMgmtCtl) & MD_CA_BUSY) {
		i++;
		if (i > 100) {
			printk("Error: lan_saa9730_mii_init: timeout\n");